Documentation/block/bfq-iosched.txt | 122 +- Documentation/scheduler/sched-BFS.txt | 351 + Documentation/scheduler/sched-MuQSS.txt | 347 + Documentation/sysctl/kernel.txt | 37 + Documentation/tp_smapi.txt | 267 + Makefile | 8 +- arch/powerpc/platforms/cell/spufs/sched.c | 5 - arch/x86/Kconfig | 18 +- arch/x86/Kconfig.cpu | 228 +- arch/x86/Makefile | 33 +- arch/x86/Makefile_32.cpu | 23 +- arch/x86/include/asm/module.h | 38 + block/Kconfig.iosched | 50 + block/Makefile | 2 + block/bfq-cgroup-included.c | 1329 + block/bfq-ioc.c | 36 + block/bfq-mq-iosched.c | 5693 +++ block/bfq-mq.h | 987 + block/bfq-sched.c | 2057 + block/bfq-sq-iosched.c | 5405 +++ block/bfq.h | 989 + block/elevator.c | 4 + drivers/cpufreq/cpufreq_ondemand.c | 12 +- drivers/input/mouse/synaptics.c | 4 +- drivers/input/mouse/synaptics.h | 1 + drivers/macintosh/Kconfig | 7 + drivers/macintosh/adbhid.c | 83 +- drivers/platform/x86/Kconfig | 19 + drivers/platform/x86/Makefile | 2 + drivers/platform/x86/hdaps.c | 947 +- drivers/platform/x86/thinkpad_ec.c | 513 + drivers/platform/x86/tp_smapi.c | 1493 + drivers/scsi/Kconfig | 2 + drivers/scsi/Makefile | 1 + drivers/scsi/vhba/Kconfig | 9 + drivers/scsi/vhba/Makefile | 4 + drivers/scsi/vhba/vhba.c | 1076 + drivers/tty/Kconfig | 13 + drivers/video/logo/Kconfig | 95 +- drivers/video/logo/Makefile | 12 + drivers/video/logo/logo.c | 190 +- drivers/video/logo/logo_arch_clut224.ppm | 43204 +++++++++++++++++++++ drivers/video/logo/logo_bsd_clut224.ppm | 2403 ++ drivers/video/logo/logo_debian_clut224.ppm | 883 + drivers/video/logo/logo_exherbo_clut224.ppm | 963 + drivers/video/logo/logo_fbsd_clut224.ppm | 2403 ++ drivers/video/logo/logo_fedoraglossy_clut224.ppm | 1123 + drivers/video/logo/logo_fedorasimple_clut224.ppm | 1123 + drivers/video/logo/logo_gentoo_clut224.ppm | 803 + drivers/video/logo/logo_oldzen_clut224.ppm | 882 + drivers/video/logo/logo_slackware_clut224.ppm | 1123 + drivers/video/logo/logo_tits_clut224.ppm | 1443 + drivers/video/logo/logo_zen_clut224.ppm | 2043 + fs/Kconfig | 1 + fs/Makefile | 1 + fs/exec.c | 6 +- fs/exfat/Kconfig | 39 + fs/exfat/LICENSE | 339 + fs/exfat/Makefile | 54 + fs/exfat/README.md | 98 + fs/exfat/dkms.conf | 7 + fs/exfat/exfat-km.mk | 11 + fs/exfat/exfat_api.c | 528 + fs/exfat/exfat_api.h | 206 + fs/exfat/exfat_bitmap.c | 63 + fs/exfat/exfat_bitmap.h | 55 + fs/exfat/exfat_blkdev.c | 197 + fs/exfat/exfat_blkdev.h | 73 + fs/exfat/exfat_cache.c | 784 + fs/exfat/exfat_cache.h | 85 + fs/exfat/exfat_config.h | 69 + fs/exfat/exfat_core.c | 5138 +++ fs/exfat/exfat_core.h | 671 + fs/exfat/exfat_data.c | 77 + fs/exfat/exfat_data.h | 58 + fs/exfat/exfat_nls.c | 448 + fs/exfat/exfat_nls.h | 91 + fs/exfat/exfat_oal.c | 196 + fs/exfat/exfat_oal.h | 74 + fs/exfat/exfat_super.c | 2697 ++ fs/exfat/exfat_super.h | 171 + fs/exfat/exfat_upcase.c | 405 + fs/exfat/exfat_version.h | 19 + fs/open.c | 4 + fs/proc/base.c | 2 +- include/linux/blkdev.h | 10 +- include/linux/init_task.h | 78 +- include/linux/ioprio.h | 2 + include/linux/linux_logo.h | 12 + include/linux/sched.h | 60 +- include/linux/sched/nohz.h | 4 +- include/linux/sched/prio.h | 12 + include/linux/sched/task.h | 2 +- include/linux/skip_list.h | 33 + include/linux/thinkpad_ec.h | 47 + include/trace/events/fs.h | 53 + include/uapi/linux/sched.h | 9 +- include/uapi/linux/vt.h | 15 +- init/Kconfig | 59 +- init/main.c | 3 +- kernel/Makefile | 2 +- kernel/delayacct.c | 2 +- kernel/exit.c | 4 +- kernel/kthread.c | 30 +- kernel/livepatch/transition.c | 8 +- kernel/rcu/Kconfig | 2 +- kernel/sched/Makefile | 14 +- kernel/sched/MuQSS.c | 6855 ++++ kernel/sched/MuQSS.h | 701 + kernel/sched/cpufreq_schedutil.c | 12 + kernel/sched/cputime.c | 22 +- kernel/sched/fair.c | 25 + kernel/sched/idle.c | 13 +- kernel/sched/sched.h | 30 +- kernel/skip_list.c | 148 + kernel/sysctl.c | 52 +- kernel/time/clockevents.c | 5 + kernel/time/posix-cpu-timers.c | 8 +- kernel/time/timer.c | 7 +- kernel/trace/trace_selftest.c | 5 + lib/Kconfig.debug | 3 +- mm/page-writeback.c | 8 + net/ipv4/Kconfig | 4 + scripts/mkcompile_h | 4 +- 124 files changed, 101349 insertions(+), 589 deletions(-) diff --git a/Documentation/block/bfq-iosched.txt b/Documentation/block/bfq-iosched.txt index 05e2822a80b34d0f..6aa5a8885170224d 100644 --- a/Documentation/block/bfq-iosched.txt +++ b/Documentation/block/bfq-iosched.txt @@ -11,29 +11,40 @@ controllers), BFQ's main features are: groups (switching back to time distribution when needed to keep throughput high). +If bfq-mq patches have been applied, then the following three +instances of BFQ are available (otherwise only the first instance): +- bfq: mainline version of BFQ, for blk-mq +- bfq-mq: development version of BFQ for blk-mq; this version contains + also all latest features and fixes not yet landed in mainline, plus many + safety checks +- bfq-sq: BFQ for legacy blk; also this version contains latest features + and fixes, as well as safety checks + In its default configuration, BFQ privileges latency over throughput. So, when needed for achieving a lower latency, BFQ builds schedules that may lead to a lower throughput. If your main or only goal, for a given device, is to achieve the maximum-possible throughput at all times, then do switch off all low-latency heuristics -for that device, by setting low_latency to 0. Full details in Section 3. +for that device, by setting low_latency to 0. See Section 3 for +details on how to configure BFQ for the desired tradeoff between +latency and throughput, or on how to maximize throughput. On average CPUs, the current version of BFQ can handle devices performing at most ~30K IOPS; at most ~50 KIOPS on faster CPUs. As a reference, 30-50 KIOPS correspond to very high bandwidths with sequential I/O (e.g., 8-12 GB/s if I/O requests are 256 KB large), and -to 120-200 MB/s with 4KB random I/O. BFQ has not yet been tested on -multi-queue devices. +to 120-200 MB/s with 4KB random I/O. BFQ is currently being tested on +multi-queue devices too. -The table of contents follow. Impatients can just jump to Section 3. +The table of contents follows. Impatients can just jump to Section 3. CONTENTS 1. When may BFQ be useful? 1-1 Personal systems 1-2 Server systems 2. How does BFQ work? -3. What are BFQ's tunable? +3. What are BFQ's tunables and how to properly configure BFQ? 4. BFQ group scheduling 4-1 Service guarantees provided 4-2 Interface @@ -145,19 +156,28 @@ plus a lot of code, are borrowed from CFQ. contrast, BFQ may idle the device for a short time interval, giving the process the chance to go on being served if it issues a new request in time. Device idling typically boosts the - throughput on rotational devices, if processes do synchronous - and sequential I/O. In addition, under BFQ, device idling is - also instrumental in guaranteeing the desired throughput - fraction to processes issuing sync requests (see the description - of the slice_idle tunable in this document, or [1, 2], for more - details). + throughput on rotational devices and on non-queueing flash-based + devices, if processes do synchronous and sequential I/O. In + addition, under BFQ, device idling is also instrumental in + guaranteeing the desired throughput fraction to processes + issuing sync requests (see the description of the slice_idle + tunable in this document, or [1, 2], for more details). - With respect to idling for service guarantees, if several processes are competing for the device at the same time, but - all processes (and groups, after the following commit) have - the same weight, then BFQ guarantees the expected throughput - distribution without ever idling the device. Throughput is - thus as high as possible in this common scenario. + all processes and groups have the same weight, then BFQ + guarantees the expected throughput distribution without ever + idling the device. Throughput is thus as high as possible in + this common scenario. + + - On flash-based storage with internal queueing of commands + (typically NCQ), device idling happens to be always detrimental + for throughput. So, with these devices, BFQ performs idling + only when strictly needed for service guarantees, i.e., for + guaranteeing low latency or fairness. In these cases, overall + throughput may be sub-optimal. No solution currently exists to + provide both strong service guarantees and optimal throughput + on devices with internal queueing. - If low-latency mode is enabled (default configuration), BFQ executes some special heuristics to detect interactive and soft @@ -191,10 +211,7 @@ plus a lot of code, are borrowed from CFQ. - Queues are scheduled according to a variant of WF2Q+, named B-WF2Q+, and implemented using an augmented rb-tree to preserve an O(log N) overall complexity. See [2] for more details. B-WF2Q+ is - also ready for hierarchical scheduling. However, for a cleaner - logical breakdown, the code that enables and completes - hierarchical support is provided in the next commit, which focuses - exactly on this feature. + also ready for hierarchical scheduling, details in Section 4. - B-WF2Q+ guarantees a tight deviation with respect to an ideal, perfectly fair, and smooth service. In particular, B-WF2Q+ @@ -249,13 +266,24 @@ plus a lot of code, are borrowed from CFQ. the Idle class, to prevent it from starving. -3. What are BFQ's tunable? -========================== +3. What are BFQ's tunables and how to properly configure BFQ? +============================================================= -The tunables back_seek-max, back_seek_penalty, fifo_expire_async and -fifo_expire_sync below are the same as in CFQ. Their description is -just copied from that for CFQ. Some considerations in the description -of slice_idle are copied from CFQ too. +Most BFQ tunables affect service guarantees (basically latency and +fairness) and throughput. For full details on how to choose the +desired tradeoff between service guarantees and throughput, see the +parameters slice_idle, strict_guarantees and low_latency. For details +on how to maximise throughput, see slice_idle, timeout_sync and +max_budget. The other performance-related parameters have been +inherited from, and have been preserved mostly for compatibility with +CFQ. So far, no performance improvement has been reported after +changing the latter parameters in BFQ. + +In particular, the tunables back_seek-max, back_seek_penalty, +fifo_expire_async and fifo_expire_sync below are the same as in +CFQ. Their description is just copied from that for CFQ. Some +considerations in the description of slice_idle are copied from CFQ +too. per-process ioprio and weight ----------------------------- @@ -285,40 +313,43 @@ number of seeks and see improved throughput. Setting slice_idle to 0 will remove all the idling on queues and one should see an overall improved throughput on faster storage devices -like multiple SATA/SAS disks in hardware RAID configuration. +like multiple SATA/SAS disks in hardware RAID configuration, as well +as flash-based storage with internal command queueing (and +parallelism). So depending on storage and workload, it might be useful to set slice_idle=0. In general for SATA/SAS disks and software RAID of SATA/SAS disks keeping slice_idle enabled should be useful. For any configurations where there are multiple spindles behind single LUN -(Host based hardware RAID controller or for storage arrays), setting -slice_idle=0 might end up in better throughput and acceptable -latencies. +(Host based hardware RAID controller or for storage arrays), or with +flash-based fast storage, setting slice_idle=0 might end up in better +throughput and acceptable latencies. Idling is however necessary to have service guarantees enforced in case of differentiated weights or differentiated I/O-request lengths. To see why, suppose that a given BFQ queue A must get several I/O requests served for each request served for another queue B. Idling ensures that, if A makes a new I/O request slightly after becoming empty, then no request of B is dispatched in the middle, and thus A does not lose the possibility to get more than one request dispatched before the next request of B is dispatched. Note that idling guarantees the desired differentiated treatment of queues only in terms of I/O-request dispatches. To guarantee that the actual service order then corresponds to the dispatch order, the strict_guarantees tunable must be set too. There is an important flipside for idling: apart from the above cases where it is beneficial also for throughput, idling can severely impact throughput. One important case is random workload. Because of this issue, BFQ tends to avoid idling as much as possible, when it is not -beneficial also for throughput. As a consequence of this behavior, and -of further issues described for the strict_guarantees tunable, -short-term service guarantees may be occasionally violated. And, in -some cases, these guarantees may be more important than guaranteeing -maximum throughput. For example, in video playing/streaming, a very -low drop rate may be more important than maximum throughput. In these -cases, consider setting the strict_guarantees parameter. +beneficial also for throughput (as detailed in Section 2). As a +consequence of this behavior, and of further issues described for the +strict_guarantees tunable, short-term service guarantees may be +occasionally violated. And, in some cases, these guarantees may be +more important than guaranteeing maximum throughput. For example, in +video playing/streaming, a very low drop rate may be more important +than maximum throughput. In these cases, consider setting the +strict_guarantees parameter. strict_guarantees ----------------- @@ -420,6 +451,13 @@ The default value is 0, which enables auto-tuning: BFQ sets max_budget to the maximum number of sectors that can be served during timeout_sync, according to the estimated peak rate. +For specific devices, some users have occasionally reported to have +reached a higher throughput by setting max_budget explicitly, i.e., by +setting max_budget to a higher value than 0. In particular, they have +set max_budget to higher values than those to which BFQ would have set +it with auto-tuning. An alternative way to achieve this goal is to +just increase the value of timeout_sync, leaving max_budget equal to 0. + weights ------- @@ -510,18 +548,20 @@ To get proportional sharing of bandwidth with BFQ for a given device, BFQ must of course be the active scheduler for that device. Within each group directory, the names of the files associated with -BFQ-specific cgroup parameters and stats begin with the "bfq." -prefix. So, with cgroups-v1 or cgroups-v2, the full prefix for -BFQ-specific files is "blkio.bfq." or "io.bfq." For example, the group -parameter to set the weight of a group with BFQ is blkio.bfq.weight +BFQ-specific cgroup parameters and stats begin with the "bfq.", +"bfq-sq." or "bfq-mq." prefix, depending on which instance of bfq you +want to use. So, with cgroups-v1 or cgroups-v2, the full prefix for +BFQ-specific files is "blkio.bfqX." or "io.bfqX.", where X can be "" +(i.e., null string), "-sq" or "-mq". For example, the group parameter +to set the weight of a group with the mainline BFQ is blkio.bfq.weight or io.bfq.weight. Parameters to set ----------------- For each group, there is only the following parameter to set. -weight (namely blkio.bfq.weight or io.bfq-weight): the weight of the +weight (namely blkio.bfqX.weight or io.bfqX.weight): the weight of the group inside its parent. Available values: 1..10000 (default 100). The linear mapping between ioprio and weights, described at the beginning of the tunable section, is still valid, but all weights higher than diff --git a/Documentation/scheduler/sched-BFS.txt b/Documentation/scheduler/sched-BFS.txt new file mode 100644 index 0000000000000000..c0282002a079131b --- /dev/null +++ b/Documentation/scheduler/sched-BFS.txt @@ -0,0 +1,351 @@ +BFS - The Brain Fuck Scheduler by Con Kolivas. + +Goals. + +The goal of the Brain Fuck Scheduler, referred to as BFS from here on, is to +completely do away with the complex designs of the past for the cpu process +scheduler and instead implement one that is very simple in basic design. +The main focus of BFS is to achieve excellent desktop interactivity and +responsiveness without heuristics and tuning knobs that are difficult to +understand, impossible to model and predict the effect of, and when tuned to +one workload cause massive detriment to another. + + +Design summary. + +BFS is best described as a single runqueue, O(n) lookup, earliest effective +virtual deadline first design, loosely based on EEVDF (earliest eligible virtual +deadline first) and my previous Staircase Deadline scheduler. Each component +shall be described in order to understand the significance of, and reasoning for +it. The codebase when the first stable version was released was approximately +9000 lines less code than the existing mainline linux kernel scheduler (in +2.6.31). This does not even take into account the removal of documentation and +the cgroups code that is not used. + +Design reasoning. + +The single runqueue refers to the queued but not running processes for the +entire system, regardless of the number of CPUs. The reason for going back to +a single runqueue design is that once multiple runqueues are introduced, +per-CPU or otherwise, there will be complex interactions as each runqueue will +be responsible for the scheduling latency and fairness of the tasks only on its +own runqueue, and to achieve fairness and low latency across multiple CPUs, any +advantage in throughput of having CPU local tasks causes other disadvantages. +This is due to requiring a very complex balancing system to at best achieve some +semblance of fairness across CPUs and can only maintain relatively low latency +for tasks bound to the same CPUs, not across them. To increase said fairness +and latency across CPUs, the advantage of local runqueue locking, which makes +for better scalability, is lost due to having to grab multiple locks. + +A significant feature of BFS is that all accounting is done purely based on CPU +used and nowhere is sleep time used in any way to determine entitlement or +interactivity. Interactivity "estimators" that use some kind of sleep/run +algorithm are doomed to fail to detect all interactive tasks, and to falsely tag +tasks that aren't interactive as being so. The reason for this is that it is +close to impossible to determine that when a task is sleeping, whether it is +doing it voluntarily, as in a userspace application waiting for input in the +form of a mouse click or otherwise, or involuntarily, because it is waiting for +another thread, process, I/O, kernel activity or whatever. Thus, such an +estimator will introduce corner cases, and more heuristics will be required to +cope with those corner cases, introducing more corner cases and failed +interactivity detection and so on. Interactivity in BFS is built into the design +by virtue of the fact that tasks that are waking up have not used up their quota +of CPU time, and have earlier effective deadlines, thereby making it very likely +they will preempt any CPU bound task of equivalent nice level. See below for +more information on the virtual deadline mechanism. Even if they do not preempt +a running task, because the rr interval is guaranteed to have a bound upper +limit on how long a task will wait for, it will be scheduled within a timeframe +that will not cause visible interface jitter. + + +Design details. + +Task insertion. + +BFS inserts tasks into each relevant queue as an O(1) insertion into a double +linked list. On insertion, *every* running queue is checked to see if the newly +queued task can run on any idle queue, or preempt the lowest running task on the +system. This is how the cross-CPU scheduling of BFS achieves significantly lower +latency per extra CPU the system has. In this case the lookup is, in the worst +case scenario, O(n) where n is the number of CPUs on the system. + +Data protection. + +BFS has one single lock protecting the process local data of every task in the +global queue. Thus every insertion, removal and modification of task data in the +global runqueue needs to grab the global lock. However, once a task is taken by +a CPU, the CPU has its own local data copy of the running process' accounting +information which only that CPU accesses and modifies (such as during a +timer tick) thus allowing the accounting data to be updated lockless. Once a +CPU has taken a task to run, it removes it from the global queue. Thus the +global queue only ever has, at most, + + (number of tasks requesting cpu time) - (number of logical CPUs) + 1 + +tasks in the global queue. This value is relevant for the time taken to look up +tasks during scheduling. This will increase if many tasks with CPU affinity set +in their policy to limit which CPUs they're allowed to run on if they outnumber +the number of CPUs. The +1 is because when rescheduling a task, the CPU's +currently running task is put back on the queue. Lookup will be described after +the virtual deadline mechanism is explained. + +Virtual deadline. + +The key to achieving low latency, scheduling fairness, and "nice level" +distribution in BFS is entirely in the virtual deadline mechanism. The one +tunable in BFS is the rr_interval, or "round robin interval". This is the +maximum time two SCHED_OTHER (or SCHED_NORMAL, the common scheduling policy) +tasks of the same nice level will be running for, or looking at it the other +way around, the longest duration two tasks of the same nice level will be +delayed for. When a task requests cpu time, it is given a quota (time_slice) +equal to the rr_interval and a virtual deadline. The virtual deadline is +offset from the current time in jiffies by this equation: + + jiffies + (prio_ratio * rr_interval) + +The prio_ratio is determined as a ratio compared to the baseline of nice -20 +and increases by 10% per nice level. The deadline is a virtual one only in that +no guarantee is placed that a task will actually be scheduled by this time, but +it is used to compare which task should go next. There are three components to +how a task is next chosen. First is time_slice expiration. If a task runs out +of its time_slice, it is descheduled, the time_slice is refilled, and the +deadline reset to that formula above. Second is sleep, where a task no longer +is requesting CPU for whatever reason. The time_slice and deadline are _not_ +adjusted in this case and are just carried over for when the task is next +scheduled. Third is preemption, and that is when a newly waking task is deemed +higher priority than a currently running task on any cpu by virtue of the fact +that it has an earlier virtual deadline than the currently running task. The +earlier deadline is the key to which task is next chosen for the first and +second cases. Once a task is descheduled, it is put back on the queue, and an +O(n) lookup of all queued-but-not-running tasks is done to determine which has +the earliest deadline and that task is chosen to receive CPU next. + +The CPU proportion of different nice tasks works out to be approximately the + + (prio_ratio difference)^2 + +The reason it is squared is that a task's deadline does not change while it is +running unless it runs out of time_slice. Thus, even if the time actually +passes the deadline of another task that is queued, it will not get CPU time +unless the current running task deschedules, and the time "base" (jiffies) is +constantly moving. + +Task lookup. + +BFS has 103 priority queues. 100 of these are dedicated to the static priority +of realtime tasks, and the remaining 3 are, in order of best to worst priority, +SCHED_ISO (isochronous), SCHED_NORMAL, and SCHED_IDLEPRIO (idle priority +scheduling). When a task of these priorities is queued, a bitmap of running +priorities is set showing which of these priorities has tasks waiting for CPU +time. When a CPU is made to reschedule, the lookup for the next task to get +CPU time is performed in the following way: + +First the bitmap is checked to see what static priority tasks are queued. If +any realtime priorities are found, the corresponding queue is checked and the +first task listed there is taken (provided CPU affinity is suitable) and lookup +is complete. If the priority corresponds to a SCHED_ISO task, they are also +taken in FIFO order (as they behave like SCHED_RR). If the priority corresponds +to either SCHED_NORMAL or SCHED_IDLEPRIO, then the lookup becomes O(n). At this +stage, every task in the runlist that corresponds to that priority is checked +to see which has the earliest set deadline, and (provided it has suitable CPU +affinity) it is taken off the runqueue and given the CPU. If a task has an +expired deadline, it is taken and the rest of the lookup aborted (as they are +chosen in FIFO order). + +Thus, the lookup is O(n) in the worst case only, where n is as described +earlier, as tasks may be chosen before the whole task list is looked over. + + +Scalability. + +The major limitations of BFS will be that of scalability, as the separate +runqueue designs will have less lock contention as the number of CPUs rises. +However they do not scale linearly even with separate runqueues as multiple +runqueues will need to be locked concurrently on such designs to be able to +achieve fair CPU balancing, to try and achieve some sort of nice-level fairness +across CPUs, and to achieve low enough latency for tasks on a busy CPU when +other CPUs would be more suited. BFS has the advantage that it requires no +balancing algorithm whatsoever, as balancing occurs by proxy simply because +all CPUs draw off the global runqueue, in priority and deadline order. Despite +the fact that scalability is _not_ the prime concern of BFS, it both shows very +good scalability to smaller numbers of CPUs and is likely a more scalable design +at these numbers of CPUs. + +It also has some very low overhead scalability features built into the design +when it has been deemed their overhead is so marginal that they're worth adding. +The first is the local copy of the running process' data to the CPU it's running +on to allow that data to be updated lockless where possible. Then there is +deference paid to the last CPU a task was running on, by trying that CPU first +when looking for an idle CPU to use the next time it's scheduled. Finally there +is the notion of cache locality beyond the last running CPU. The sched_domains +information is used to determine the relative virtual "cache distance" that +other CPUs have from the last CPU a task was running on. CPUs with shared +caches, such as SMT siblings, or multicore CPUs with shared caches, are treated +as cache local. CPUs without shared caches are treated as not cache local, and +CPUs on different NUMA nodes are treated as very distant. This "relative cache +distance" is used by modifying the virtual deadline value when doing lookups. +Effectively, the deadline is unaltered between "cache local" CPUs, doubled for +"cache distant" CPUs, and quadrupled for "very distant" CPUs. The reasoning +behind the doubling of deadlines is as follows. The real cost of migrating a +task from one CPU to another is entirely dependant on the cache footprint of +the task, how cache intensive the task is, how long it's been running on that +CPU to take up the bulk of its cache, how big the CPU cache is, how fast and +how layered the CPU cache is, how fast a context switch is... and so on. In +other words, it's close to random in the real world where we do more than just +one sole workload. The only thing we can be sure of is that it's not free. So +BFS uses the principle that an idle CPU is a wasted CPU and utilising idle CPUs +is more important than cache locality, and cache locality only plays a part +after that. Doubling the effective deadline is based on the premise that the +"cache local" CPUs will tend to work on the same tasks up to double the number +of cache local CPUs, and once the workload is beyond that amount, it is likely +that none of the tasks are cache warm anywhere anyway. The quadrupling for NUMA +is a value I pulled out of my arse. + +When choosing an idle CPU for a waking task, the cache locality is determined +according to where the task last ran and then idle CPUs are ranked from best +to worst to choose the most suitable idle CPU based on cache locality, NUMA +node locality and hyperthread sibling business. They are chosen in the +following preference (if idle): + +* Same core, idle or busy cache, idle threads +* Other core, same cache, idle or busy cache, idle threads. +* Same node, other CPU, idle cache, idle threads. +* Same node, other CPU, busy cache, idle threads. +* Same core, busy threads. +* Other core, same cache, busy threads. +* Same node, other CPU, busy threads. +* Other node, other CPU, idle cache, idle threads. +* Other node, other CPU, busy cache, idle threads. +* Other node, other CPU, busy threads. + +This shows the SMT or "hyperthread" awareness in the design as well which will +choose a real idle core first before a logical SMT sibling which already has +tasks on the physical CPU. + +Early benchmarking of BFS suggested scalability dropped off at the 16 CPU mark. +However this benchmarking was performed on an earlier design that was far less +scalable than the current one so it's hard to know how scalable it is in terms +of both CPUs (due to the global runqueue) and heavily loaded machines (due to +O(n) lookup) at this stage. Note that in terms of scalability, the number of +_logical_ CPUs matters, not the number of _physical_ CPUs. Thus, a dual (2x) +quad core (4X) hyperthreaded (2X) machine is effectively a 16X. Newer benchmark +results are very promising indeed, without needing to tweak any knobs, features +or options. Benchmark contributions are most welcome. + + +Features + +As the initial prime target audience for BFS was the average desktop user, it +was designed to not need tweaking, tuning or have features set to obtain benefit +from it. Thus the number of knobs and features has been kept to an absolute +minimum and should not require extra user input for the vast majority of cases. +There are precisely 2 tunables, and 2 extra scheduling policies. The rr_interval +and iso_cpu tunables, and the SCHED_ISO and SCHED_IDLEPRIO policies. In addition +to this, BFS also uses sub-tick accounting. What BFS does _not_ now feature is +support for CGROUPS. The average user should neither need to know what these +are, nor should they need to be using them to have good desktop behaviour. + +rr_interval + +There is only one "scheduler" tunable, the round robin interval. This can be +accessed in + + /proc/sys/kernel/rr_interval + +The value is in milliseconds, and the default value is set to 6 on a +uniprocessor machine, and automatically set to a progressively higher value on +multiprocessor machines. The reasoning behind increasing the value on more CPUs +is that the effective latency is decreased by virtue of there being more CPUs on +BFS (for reasons explained above), and increasing the value allows for less +cache contention and more throughput. Valid values are from 1 to 1000 +Decreasing the value will decrease latencies at the cost of decreasing +throughput, while increasing it will improve throughput, but at the cost of +worsening latencies. The accuracy of the rr interval is limited by HZ resolution +of the kernel configuration. Thus, the worst case latencies are usually slightly +higher than this actual value. The default value of 6 is not an arbitrary one. +It is based on the fact that humans can detect jitter at approximately 7ms, so +aiming for much lower latencies is pointless under most circumstances. It is +worth noting this fact when comparing the latency performance of BFS to other +schedulers. Worst case latencies being higher than 7ms are far worse than +average latencies not being in the microsecond range. + +Isochronous scheduling. + +Isochronous scheduling is a unique scheduling policy designed to provide +near-real-time performance to unprivileged (ie non-root) users without the +ability to starve the machine indefinitely. Isochronous tasks (which means +"same time") are set using, for example, the schedtool application like so: + + schedtool -I -e amarok + +This will start the audio application "amarok" as SCHED_ISO. How SCHED_ISO works +is that it has a priority level between true realtime tasks and SCHED_NORMAL +which would allow them to preempt all normal tasks, in a SCHED_RR fashion (ie, +if multiple SCHED_ISO tasks are running, they purely round robin at rr_interval +rate). However if ISO tasks run for more than a tunable finite amount of time, +they are then demoted back to SCHED_NORMAL scheduling. This finite amount of +time is the percentage of _total CPU_ available across the machine, configurable +as a percentage in the following "resource handling" tunable (as opposed to a +scheduler tunable): + + /proc/sys/kernel/iso_cpu + +and is set to 70% by default. It is calculated over a rolling 5 second average +Because it is the total CPU available, it means that on a multi CPU machine, it +is possible to have an ISO task running as realtime scheduling indefinitely on +just one CPU, as the other CPUs will be available. Setting this to 100 is the +equivalent of giving all users SCHED_RR access and setting it to 0 removes the +ability to run any pseudo-realtime tasks. + +A feature of BFS is that it detects when an application tries to obtain a +realtime policy (SCHED_RR or SCHED_FIFO) and the caller does not have the +appropriate privileges to use those policies. When it detects this, it will +give the task SCHED_ISO policy instead. Thus it is transparent to the user. +Because some applications constantly set their policy as well as their nice +level, there is potential for them to undo the override specified by the user +on the command line of setting the policy to SCHED_ISO. To counter this, once +a task has been set to SCHED_ISO policy, it needs superuser privileges to set +it back to SCHED_NORMAL. This will ensure the task remains ISO and all child +processes and threads will also inherit the ISO policy. + +Idleprio scheduling. + +Idleprio scheduling is a scheduling policy designed to give out CPU to a task +_only_ when the CPU would be otherwise idle. The idea behind this is to allow +ultra low priority tasks to be run in the background that have virtually no +effect on the foreground tasks. This is ideally suited to distributed computing +clients (like setiathome, folding, mprime etc) but can also be used to start +a video encode or so on without any slowdown of other tasks. To avoid this +policy from grabbing shared resources and holding them indefinitely, if it +detects a state where the task is waiting on I/O, the machine is about to +suspend to ram and so on, it will transiently schedule them as SCHED_NORMAL. As +per the Isochronous task management, once a task has been scheduled as IDLEPRIO, +it cannot be put back to SCHED_NORMAL without superuser privileges. Tasks can +be set to start as SCHED_IDLEPRIO with the schedtool command like so: + + schedtool -D -e ./mprime + +Subtick accounting. + +It is surprisingly difficult to get accurate CPU accounting, and in many cases, +the accounting is done by simply determining what is happening at the precise +moment a timer tick fires off. This becomes increasingly inaccurate as the +timer tick frequency (HZ) is lowered. It is possible to create an application +which uses almost 100% CPU, yet by being descheduled at the right time, records +zero CPU usage. While the main problem with this is that there are possible +security implications, it is also difficult to determine how much CPU a task +really does use. BFS tries to use the sub-tick accounting from the TSC clock, +where possible, to determine real CPU usage. This is not entirely reliable, but +is far more likely to produce accurate CPU usage data than the existing designs +and will not show tasks as consuming no CPU usage when they actually are. Thus, +the amount of CPU reported as being used by BFS will more accurately represent +how much CPU the task itself is using (as is shown for example by the 'time' +application), so the reported values may be quite different to other schedulers. +Values reported as the 'load' are more prone to problems with this design, but +per process values are closer to real usage. When comparing throughput of BFS +to other designs, it is important to compare the actual completed work in terms +of total wall clock time taken and total work done, rather than the reported +"cpu usage". + + +Con Kolivas Fri Aug 27 2010 diff --git a/Documentation/scheduler/sched-MuQSS.txt b/Documentation/scheduler/sched-MuQSS.txt new file mode 100644 index 0000000000000000..7c18444444e2b6fd --- /dev/null +++ b/Documentation/scheduler/sched-MuQSS.txt @@ -0,0 +1,347 @@ +MuQSS - The Multiple Queue Skiplist Scheduler by Con Kolivas. + +MuQSS is a per-cpu runqueue variant of the original BFS scheduler with +one 8 level skiplist per runqueue, and fine grained locking for much more +scalability. + + +Goals. + +The goal of the Multiple Queue Skiplist Scheduler, referred to as MuQSS from +here on (pronounced mux) is to completely do away with the complex designs of +the past for the cpu process scheduler and instead implement one that is very +simple in basic design. The main focus of MuQSS is to achieve excellent desktop +interactivity and responsiveness without heuristics and tuning knobs that are +difficult to understand, impossible to model and predict the effect of, and when +tuned to one workload cause massive detriment to another, while still being +scalable to many CPUs and processes. + + +Design summary. + +MuQSS is best described as per-cpu multiple runqueue, O(log n) insertion, O(1) +lookup, earliest effective virtual deadline first tickless design, loosely based +on EEVDF (earliest eligible virtual deadline first) and my previous Staircase +Deadline scheduler, and evolved from the single runqueue O(n) BFS scheduler. +Each component shall be described in order to understand the significance of, +and reasoning for it. + + +Design reasoning. + +In BFS, the use of a single runqueue across all CPUs meant that each CPU would +need to scan the entire runqueue looking for the process with the earliest +deadline and schedule that next, regardless of which CPU it originally came +from. This made BFS deterministic with respect to latency and provided +guaranteed latencies dependent on number of processes and CPUs. The single +runqueue, however, meant that all CPUs would compete for the single lock +protecting it, which would lead to increasing lock contention as the number of +CPUs rose and appeared to limit scalability of common workloads beyond 16 +logical CPUs. Additionally, the O(n) lookup of the runqueue list obviously +increased overhead proportionate to the number of queued proecesses and led to +cache thrashing while iterating over the linked list. + +MuQSS is an evolution of BFS, designed to maintain the same scheduling +decision mechanism and be virtually deterministic without relying on the +constrained design of the single runqueue by splitting out the single runqueue +to be per-CPU and use skiplists instead of linked lists. + +The original reason for going back to a single runqueue design for BFS was that +once multiple runqueues are introduced, per-CPU or otherwise, there will be +complex interactions as each runqueue will be responsible for the scheduling +latency and fairness of the tasks only on its own runqueue, and to achieve +fairness and low latency across multiple CPUs, any advantage in throughput of +having CPU local tasks causes other disadvantages. This is due to requiring a +very complex balancing system to at best achieve some semblance of fairness +across CPUs and can only maintain relatively low latency for tasks bound to the +same CPUs, not across them. To increase said fairness and latency across CPUs, +the advantage of local runqueue locking, which makes for better scalability, is +lost due to having to grab multiple locks. + +MuQSS works around the problems inherent in multiple runqueue designs by +making its skip lists priority ordered and through novel use of lockless +examination of each other runqueue it can decide if it should take the earliest +deadline task from another runqueue for latency reasons, or for CPU balancing +reasons. It still does not have a balancing system, choosing to allow the +next task scheduling decision and task wakeup CPU choice to allow balancing to +happen by virtue of its choices. + + +Design details. + +Custom skip list implementation: + +To avoid the overhead of building up and tearing down skip list structures, +the variant used by MuQSS has a number of optimisations making it specific for +its use case in the scheduler. It uses static arrays of 8 'levels' instead of +building up and tearing down structures dynamically. This makes each runqueue +only scale O(log N) up to 64k tasks. However as there is one runqueue per CPU +it means that it scales O(log N) up to 64k x number of logical CPUs which is +far beyond the realistic task limits each CPU could handle. By being 8 levels +it also makes the array exactly one cacheline in size. Additionally, each +skip list node is bidirectional making insertion and removal amortised O(1), +being O(k) where k is 1-8. Uniquely, we are only ever interested in the very +first entry in each list at all times with MuQSS, so there is never a need to +do a search and thus look up is always O(1). In interactive mode, the queues +will be searched beyond their first entry if the first task is not suitable +for affinity or SMT nice reasons. + +Task insertion: + +MuQSS inserts tasks into a per CPU runqueue as an O(log N) insertion into +a custom skip list as described above (based on the original design by William +Pugh). Insertion is ordered in such a way that there is never a need to do a +search by ordering tasks according to static priority primarily, and then +virtual deadline at the time of insertion. + +Niffies: + +Niffies are a monotonic forward moving timer not unlike the "jiffies" but are +of nanosecond resolution. Niffies are calculated per-runqueue from the high +resolution TSC timers, and in order to maintain fairness are synchronised +between CPUs whenever both runqueues are locked concurrently. + +Virtual deadline: + +The key to achieving low latency, scheduling fairness, and "nice level" +distribution in MuQSS is entirely in the virtual deadline mechanism. The one +tunable in MuQSS is the rr_interval, or "round robin interval". This is the +maximum time two SCHED_OTHER (or SCHED_NORMAL, the common scheduling policy) +tasks of the same nice level will be running for, or looking at it the other +way around, the longest duration two tasks of the same nice level will be +delayed for. When a task requests cpu time, it is given a quota (time_slice) +equal to the rr_interval and a virtual deadline. The virtual deadline is +offset from the current time in niffies by this equation: + + niffies + (prio_ratio * rr_interval) + +The prio_ratio is determined as a ratio compared to the baseline of nice -20 +and increases by 10% per nice level. The deadline is a virtual one only in that +no guarantee is placed that a task will actually be scheduled by this time, but +it is used to compare which task should go next. There are three components to +how a task is next chosen. First is time_slice expiration. If a task runs out +of its time_slice, it is descheduled, the time_slice is refilled, and the +deadline reset to that formula above. Second is sleep, where a task no longer +is requesting CPU for whatever reason. The time_slice and deadline are _not_ +adjusted in this case and are just carried over for when the task is next +scheduled. Third is preemption, and that is when a newly waking task is deemed +higher priority than a currently running task on any cpu by virtue of the fact +that it has an earlier virtual deadline than the currently running task. The +earlier deadline is the key to which task is next chosen for the first and +second cases. + +The CPU proportion of different nice tasks works out to be approximately the + + (prio_ratio difference)^2 + +The reason it is squared is that a task's deadline does not change while it is +running unless it runs out of time_slice. Thus, even if the time actually +passes the deadline of another task that is queued, it will not get CPU time +unless the current running task deschedules, and the time "base" (niffies) is +constantly moving. + +Task lookup: + +As tasks are already pre-ordered according to anticipated scheduling order in +the skip lists, lookup for the next suitable task per-runqueue is always a +matter of simply selecting the first task in the 0th level skip list entry. +In order to maintain optimal latency and fairness across CPUs, MuQSS does a +novel examination of every other runqueue in cache locality order, choosing the +best task across all runqueues. This provides near-determinism of how long any +task across the entire system may wait before receiving CPU time. The other +runqueues are first examine lockless and then trylocked to minimise the +potential lock contention if they are likely to have a suitable better task. +Each other runqueue lock is only held for as long as it takes to examine the +entry for suitability. In "interactive" mode, the default setting, MuQSS will +look for the best deadline task across all CPUs, while in !interactive mode, +it will only select a better deadline task from another CPU if it is more +heavily laden than the current one. + +Lookup is therefore O(k) where k is number of CPUs. + + +Latency. + +Through the use of virtual deadlines to govern the scheduling order of normal +tasks, queue-to-activation latency per runqueue is guaranteed to be bound by +the rr_interval tunable which is set to 6ms by default. This means that the +longest a CPU bound task will wait for more CPU is proportional to the number +of running tasks and in the common case of 0-2 running tasks per CPU, will be +under the 7ms threshold for human perception of jitter. Additionally, as newly +woken tasks will have an early deadline from their previous runtime, the very +tasks that are usually latency sensitive will have the shortest interval for +activation, usually preempting any existing CPU bound tasks. + +Tickless expiry: + +A feature of MuQSS is that it is not tied to the resolution of the chosen tick +rate in Hz, instead depending entirely on the high resolution timers where +possible for sub-millisecond accuracy on timeouts regarless of the underlying +tick rate. This allows MuQSS to be run with the low overhead of low Hz rates +such as 100 by default, benefiting from the improved throughput and lower +power usage it provides. Another advantage of this approach is that in +combination with the Full No HZ option, which disables ticks on running task +CPUs instead of just idle CPUs, the tick can be disabled at all times +regardless of how many tasks are running instead of being limited to just one +running task. Note that this option is NOT recommended for regular desktop +users. + + +Scalability and balancing. + +Unlike traditional approaches where balancing is a combination of CPU selection +at task wakeup and intermittent balancing based on a vast array of rules set +according to architecture, busyness calculations and special case management, +MuQSS indirectly balances on the fly at task wakeup and next task selection. +During initialisation, MuQSS creates a cache coherency ordered list of CPUs for +each logical CPU and uses this to aid task/CPU selection when CPUs are busy. +Additionally it selects any idle CPUs, if they are available, at any time over +busy CPUs according to the following preference: + + * Same thread, idle or busy cache, idle or busy threads + * Other core, same cache, idle or busy cache, idle threads. + * Same node, other CPU, idle cache, idle threads. + * Same node, other CPU, busy cache, idle threads. + * Other core, same cache, busy threads. + * Same node, other CPU, busy threads. + * Other node, other CPU, idle cache, idle threads. + * Other node, other CPU, busy cache, idle threads. + * Other node, other CPU, busy threads. + +Mux is therefore SMT, MC and Numa aware without the need for extra +intermittent balancing to maintain CPUs busy and make the most of cache +coherency. + + +Features + +As the initial prime target audience for MuQSS was the average desktop user, it +was designed to not need tweaking, tuning or have features set to obtain benefit +from it. Thus the number of knobs and features has been kept to an absolute +minimum and should not require extra user input for the vast majority of cases. +There are 3 optional tunables, and 2 extra scheduling policies. The rr_interval, +interactive, and iso_cpu tunables, and the SCHED_ISO and SCHED_IDLEPRIO +policies. In addition to this, MuQSS also uses sub-tick accounting. What MuQSS +does _not_ now feature is support for CGROUPS. The average user should neither +need to know what these are, nor should they need to be using them to have good +desktop behaviour. However since some applications refuse to work without +cgroups, one can enable them with MuQSS as a stub and the filesystem will be +created which will allow the applications to work. + +rr_interval: + + /proc/sys/kernel/rr_interval + +The value is in milliseconds, and the default value is set to 6. Valid values +are from 1 to 1000 Decreasing the value will decrease latencies at the cost of +decreasing throughput, while increasing it will improve throughput, but at the +cost of worsening latencies. It is based on the fact that humans can detect +jitter at approximately 7ms, so aiming for much lower latencies is pointless +under most circumstances. It is worth noting this fact when comparing the +latency performance of MuQSS to other schedulers. Worst case latencies being +higher than 7ms are far worse than average latencies not being in the +microsecond range. + +interactive: + + /proc/sys/kernel/interactive + +The value is a simple boolean of 1 for on and 0 for off and is set to on by +default. Disabling this will disable the near-determinism of MuQSS when +selecting the next task by not examining all CPUs for the earliest deadline +task, or which CPU to wake to, instead prioritising CPU balancing for improved +throughput. Latency will still be bound by rr_interval, but on a per-CPU basis +instead of across the whole system. + +Isochronous scheduling: + +Isochronous scheduling is a unique scheduling policy designed to provide +near-real-time performance to unprivileged (ie non-root) users without the +ability to starve the machine indefinitely. Isochronous tasks (which means +"same time") are set using, for example, the schedtool application like so: + + schedtool -I -e amarok + +This will start the audio application "amarok" as SCHED_ISO. How SCHED_ISO works +is that it has a priority level between true realtime tasks and SCHED_NORMAL +which would allow them to preempt all normal tasks, in a SCHED_RR fashion (ie, +if multiple SCHED_ISO tasks are running, they purely round robin at rr_interval +rate). However if ISO tasks run for more than a tunable finite amount of time, +they are then demoted back to SCHED_NORMAL scheduling. This finite amount of +time is the percentage of CPU available per CPU, configurable as a percentage in +the following "resource handling" tunable (as opposed to a scheduler tunable): + +iso_cpu: + + /proc/sys/kernel/iso_cpu + +and is set to 70% by default. It is calculated over a rolling 5 second average +Because it is the total CPU available, it means that on a multi CPU machine, it +is possible to have an ISO task running as realtime scheduling indefinitely on +just one CPU, as the other CPUs will be available. Setting this to 100 is the +equivalent of giving all users SCHED_RR access and setting it to 0 removes the +ability to run any pseudo-realtime tasks. + +A feature of MuQSS is that it detects when an application tries to obtain a +realtime policy (SCHED_RR or SCHED_FIFO) and the caller does not have the +appropriate privileges to use those policies. When it detects this, it will +give the task SCHED_ISO policy instead. Thus it is transparent to the user. + + +Idleprio scheduling: + +Idleprio scheduling is a scheduling policy designed to give out CPU to a task +_only_ when the CPU would be otherwise idle. The idea behind this is to allow +ultra low priority tasks to be run in the background that have virtually no +effect on the foreground tasks. This is ideally suited to distributed computing +clients (like setiathome, folding, mprime etc) but can also be used to start a +video encode or so on without any slowdown of other tasks. To avoid this policy +from grabbing shared resources and holding them indefinitely, if it detects a +state where the task is waiting on I/O, the machine is about to suspend to ram +and so on, it will transiently schedule them as SCHED_NORMAL. Once a task has +been scheduled as IDLEPRIO, it cannot be put back to SCHED_NORMAL without +superuser privileges since it is effectively a lower scheduling policy. Tasks +can be set to start as SCHED_IDLEPRIO with the schedtool command like so: + +schedtool -D -e ./mprime + +Subtick accounting: + +It is surprisingly difficult to get accurate CPU accounting, and in many cases, +the accounting is done by simply determining what is happening at the precise +moment a timer tick fires off. This becomes increasingly inaccurate as the timer +tick frequency (HZ) is lowered. It is possible to create an application which +uses almost 100% CPU, yet by being descheduled at the right time, records zero +CPU usage. While the main problem with this is that there are possible security +implications, it is also difficult to determine how much CPU a task really does +use. Mux uses sub-tick accounting from the TSC clock to determine real CPU +usage. Thus, the amount of CPU reported as being used by MuQSS will more +accurately represent how much CPU the task itself is using (as is shown for +example by the 'time' application), so the reported values may be quite +different to other schedulers. When comparing throughput of MuQSS to other +designs, it is important to compare the actual completed work in terms of total +wall clock time taken and total work done, rather than the reported "cpu usage". + +Symmetric MultiThreading (SMT) aware nice: + +SMT, a.k.a. hyperthreading, is a very common feature on modern CPUs. While the +logical CPU count rises by adding thread units to each CPU core, allowing more +than one task to be run simultaneously on the same core, the disadvantage of it +is that the CPU power is shared between the tasks, not summating to the power +of two CPUs. The practical upshot of this is that two tasks running on +separate threads of the same core run significantly slower than if they had one +core each to run on. While smart CPU selection allows each task to have a core +to itself whenever available (as is done on MuQSS), it cannot offset the +slowdown that occurs when the cores are all loaded and only a thread is left. +Most of the time this is harmless as the CPU is effectively overloaded at this +point and the extra thread is of benefit. However when running a niced task in +the presence of an un-niced task (say nice 19 v nice 0), the nice task gets +precisely the same amount of CPU power as the unniced one. MuQSS has an +optional configuration feature known as SMT-NICE which selectively idles the +secondary niced thread for a period proportional to the nice difference, +allowing CPU distribution according to nice level to be maintained, at the +expense of a small amount of extra overhead. If this is configured in on a +machine without SMT threads, the overhead is minimal. + + +Con Kolivas Sat, 29th October 2016 diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt index bac23c198360507d..1d93520e2163519a 100644 --- a/Documentation/sysctl/kernel.txt +++ b/Documentation/sysctl/kernel.txt @@ -39,6 +39,7 @@ show up in /proc/sys/kernel: - hung_task_timeout_secs - hung_task_warnings - kexec_load_disabled +- iso_cpu - kptr_restrict - l2cr [ PPC only ] - modprobe ==> Documentation/debugging-modules.txt @@ -72,26 +73,28 @@ show up in /proc/sys/kernel: - randomize_va_space - real-root-dev ==> Documentation/admin-guide/initrd.rst - reboot-cmd [ SPARC only ] +- rr_interval - rtsig-max - rtsig-nr - sem - sem_next_id [ sysv ipc ] - sg-big-buff [ generic SCSI device (sg) ] - shm_next_id [ sysv ipc ] - shm_rmid_forced - shmall - shmmax [ sysv ipc ] - shmmni - softlockup_all_cpu_backtrace - soft_watchdog - stop-a [ SPARC only ] - sysrq ==> Documentation/admin-guide/sysrq.rst - sysctl_writes_strict - tainted - threads-max - unknown_nmi_panic - watchdog - watchdog_thresh +- yield_type - version ============================================================== @@ -394,6 +397,16 @@ When kptr_restrict is set to (2), kernel pointers printed using ============================================================== +iso_cpu: (MuQSS CPU scheduler only). + +This sets the percentage cpu that the unprivileged SCHED_ISO tasks can +run effectively at realtime priority, averaged over a rolling five +seconds over the -whole- system, meaning all cpus. + +Set to 70 (percent) by default. + +============================================================== + l2cr: (PPC only) This flag controls the L2 cache of G3 processor boards. If @@ -810,6 +823,20 @@ rebooting. ??? ============================================================== +rr_interval: (MuQSS CPU scheduler only) + +This is the smallest duration that any cpu process scheduling unit +will run for. Increasing this value can increase throughput of cpu +bound tasks substantially but at the expense of increased latencies +overall. Conversely decreasing it will decrease average and maximum +latencies but at the expense of throughput. This value is in +milliseconds and the default value chosen depends on the number of +cpus available at scheduler initialisation with a minimum of 6. + +Valid values are from 1-1000. + +============================================================== + rtsig-max & rtsig-nr: The file rtsig-max can be used to tune the maximum number @@ -1048,3 +1075,13 @@ The softlockup threshold is (2 * watchdog_thresh). Setting this tunable to zero will disable lockup detection altogether. ============================================================== + +yield_type: (MuQSS CPU scheduler only) + +This determines what type of yield calls to sched_yield will perform. + + 0: No yield. + 1: Yield only to better priority/deadline tasks. (default) + 2: Expire timeslice and recalculate deadline. + +============================================================== diff --git a/Documentation/tp_smapi.txt b/Documentation/tp_smapi.txt new file mode 100644 index 0000000000000000..d037301094decdea --- /dev/null +++ b/Documentation/tp_smapi.txt @@ -0,0 +1,267 @@ +tp_smapi version 0.40 +IBM ThinkPad hardware functions driver + +Author: Shem Multinymous +Project: http://sourceforge.net/projects/tpctl +Wiki: http://thinkwiki.org/wiki/tp_smapi +List: linux-thinkpad@linux-thinkpad.org + (http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad) + +Description +----------- + +ThinkPad laptops include a proprietary interface called SMAPI BIOS +(System Management Application Program Interface) which provides some +hardware control functionality that is not accessible by other means. + +This driver exposes some features of the SMAPI BIOS through a sysfs +interface. It is suitable for newer models, on which SMAPI is invoked +through IO port writes. Older models use a different SMAPI interface; +for those, try the "thinkpad" module from the "tpctl" package. + +WARNING: +This driver uses undocumented features and direct hardware access. +It thus cannot be guaranteed to work, and may cause arbitrary damage +(especially on models it wasn't tested on). + + +Module parameters +----------------- + +thinkpad_ec module: + force_io=1 lets thinkpad_ec load on some recent ThinkPad models + (e.g., T400 and T500) whose BIOS's ACPI DSDT reserves the ports we need. +tp_smapi module: + debug=1 enables verbose dmesg output. + + +Usage +----- + +Control of battery charging thresholds (in percents of current full charge +capacity): + +# echo 40 > /sys/devices/platform/smapi/BAT0/start_charge_thresh +# echo 70 > /sys/devices/platform/smapi/BAT0/stop_charge_thresh +# cat /sys/devices/platform/smapi/BAT0/*_charge_thresh + + (This is useful since Li-Ion batteries wear out much faster at very + high or low charge levels. The driver will also keeps the thresholds + across suspend-to-disk with AC disconnected; this isn't done + automatically by the hardware.) + +Inhibiting battery charging for 17 minutes (overrides thresholds): + +# echo 17 > /sys/devices/platform/smapi/BAT0/inhibit_charge_minutes +# echo 0 > /sys/devices/platform/smapi/BAT0/inhibit_charge_minutes # stop +# cat /sys/devices/platform/smapi/BAT0/inhibit_charge_minutes + + (This can be used to control which battery is charged when using an + Ultrabay battery.) + +Forcing battery discharging even if AC power available: + +# echo 1 > /sys/devices/platform/smapi/BAT0/force_discharge # start discharge +# echo 0 > /sys/devices/platform/smapi/BAT0/force_discharge # stop discharge +# cat /sys/devices/platform/smapi/BAT0/force_discharge + + (When AC is connected, forced discharging will automatically stop + when battery is fully depleted -- this is useful for calibration. + Also, this attribute can be used to control which battery is discharged + when both a system battery and an Ultrabay battery are connected.) + +Misc read-only battery status attributes (see note about HDAPS below): + +/sys/devices/platform/smapi/BAT0/installed # 0 or 1 +/sys/devices/platform/smapi/BAT0/state # idle/charging/discharging +/sys/devices/platform/smapi/BAT0/cycle_count # integer counter +/sys/devices/platform/smapi/BAT0/current_now # instantaneous current +/sys/devices/platform/smapi/BAT0/current_avg # last minute average +/sys/devices/platform/smapi/BAT0/power_now # instantaneous power +/sys/devices/platform/smapi/BAT0/power_avg # last minute average +/sys/devices/platform/smapi/BAT0/last_full_capacity # in mWh +/sys/devices/platform/smapi/BAT0/remaining_percent # remaining percent of energy (set by calibration) +/sys/devices/platform/smapi/BAT0/remaining_percent_error # error range of remaing_percent (not reset by calibration) +/sys/devices/platform/smapi/BAT0/remaining_running_time # in minutes, by last minute average power +/sys/devices/platform/smapi/BAT0/remaining_running_time_now # in minutes, by instantenous power +/sys/devices/platform/smapi/BAT0/remaining_charging_time # in minutes +/sys/devices/platform/smapi/BAT0/remaining_capacity # in mWh +/sys/devices/platform/smapi/BAT0/design_capacity # in mWh +/sys/devices/platform/smapi/BAT0/voltage # in mV +/sys/devices/platform/smapi/BAT0/design_voltage # in mV +/sys/devices/platform/smapi/BAT0/charging_max_current # max charging current +/sys/devices/platform/smapi/BAT0/charging_max_voltage # max charging voltage +/sys/devices/platform/smapi/BAT0/group{0,1,2,3}_voltage # see below +/sys/devices/platform/smapi/BAT0/manufacturer # string +/sys/devices/platform/smapi/BAT0/model # string +/sys/devices/platform/smapi/BAT0/barcoding # string +/sys/devices/platform/smapi/BAT0/chemistry # string +/sys/devices/platform/smapi/BAT0/serial # integer +/sys/devices/platform/smapi/BAT0/manufacture_date # YYYY-MM-DD +/sys/devices/platform/smapi/BAT0/first_use_date # YYYY-MM-DD +/sys/devices/platform/smapi/BAT0/temperature # in milli-Celsius +/sys/devices/platform/smapi/BAT0/dump # see below +/sys/devices/platform/smapi/ac_connected # 0 or 1 + +The BAT0/group{0,1,2,3}_voltage attribute refers to the separate cell groups +in each battery. For example, on the ThinkPad 600, X3x, T4x and R5x models, +the battery contains 3 cell groups in series, where each group consisting of 2 +or 3 cells connected in parallel. The voltage of each group is given by these +attributes, and their sum (roughly) equals the "voltage" attribute. +(The effective performance of the battery is determined by the weakest group, +i.e., the one those voltage changes most rapidly during dis/charging.) + +The "BAT0/dump" attribute gives a a hex dump of the raw status data, which +contains additional data now in the above (if you can figure it out). Some +unused values are autodetected and replaced by "--": + +In all of the above, replace BAT0 with BAT1 to address the 2nd battery (e.g. +in the UltraBay). + + +Raw SMAPI calls: + +/sys/devices/platform/smapi/smapi_request +This performs raw SMAPI calls. It uses a bad interface that cannot handle +multiple simultaneous access. Don't touch it, it's for development only. +If you did touch it, you would so something like +# echo '211a 100 0 0' > /sys/devices/platform/smapi/smapi_request +# cat /sys/devices/platform/smapi/smapi_request +and notice that in the output "211a 34b b2 0 0 0 'OK'", the "4b" in the 2nd +value, converted to decimal is 75: the current charge stop threshold. + + +Model-specific status +--------------------- + +Works (at least partially) on the following ThinkPad model: +* A30 +* G41 +* R40, R50p, R51, R52 +* T23, T40, T40p, T41, T41p, T42, T42p, T43, T43p, T60 +* X24, X31, X32, X40, X41, X60 +* Z60t, Z61m + +Not all functions are available on all models; for detailed status, see: + http://thinkwiki.org/wiki/tp_smapi + +Please report success/failure by e-mail or on the Wiki. +If you get a "not implemented" or "not supported" message, your laptop +probably just can't do that (at least not via the SMAPI BIOS). +For negative reports, follow the bug reporting guidelines below. +If you send me the necessary technical data (i.e., SMAPI function +interfaces), I will support additional models. + + +Additional HDAPS features +------------------------- + +The modified hdaps driver has several improvements on the one in mainline +(beyond resolving the conflict with thinkpad_ec and tp_smapi): + +- Fixes reliability and improves support for recent ThinkPad models + (especially *60 and newer). Unlike the mainline driver, the modified hdaps + correctly follows the Embedded Controller communication protocol. + +- Extends the "invert" parameter to cover all possible axis orientations. + The possible values are as follows. + Let X,Y denote the hardware readouts. + Let R denote the laptop's roll (tilt left/right). + Let P denote the laptop's pitch (tilt forward/backward). + invert=0: R= X P= Y (same as mainline) + invert=1: R=-X P=-Y (same as mainline) + invert=2: R=-X P= Y (new) + invert=3: R= X P=-Y (new) + invert=4: R= Y P= X (new) + invert=5: R=-Y P=-X (new) + invert=6: R=-Y P= X (new) + invert=7: R= Y P=-X (new) + It's probably easiest to just try all 8 possibilities and see which yields + correct results (e.g., in the hdaps-gl visualisation). + +- Adds a whitelist which automatically sets the correct axis orientation for + some models. If the value for your model is wrong or missing, you can override + it using the "invert" parameter. Please also update the tables at + http://www.thinkwiki.org/wiki/tp_smapi and + http://www.thinkwiki.org/wiki/List_of_DMI_IDs + and submit a patch for the whitelist in hdaps.c. + +- Provides new attributes: + /sys/devices/platform/hdaps/sampling_rate: + This determines the frequency at which the host queries the embedded + controller for accelerometer data (and informs the hdaps input devices). + Default=50. + /sys/devices/platform/hdaps/oversampling_ratio: + When set to X, the embedded controller is told to do physical accelerometer + measurements at a rate that is X times higher than the rate at which + the driver reads those measurements (i.e., X*sampling_rate). This + makes the readouts from the embedded controller more fresh, and is also + useful for the running average filter (see next). Default=5 + /sys/devices/platform/hdaps/running_avg_filter_order: + When set to X, reported readouts will be the average of the last X physical + accelerometer measurements. Current firmware allows 1<=X<=8. Setting to a + high value decreases readout fluctuations. The averaging is handled by the + embedded controller, so no CPU resources are used. Higher values make the + readouts smoother, since it averages out both sensor noise (good) and abrupt + changes (bad). Default=2. + +- Provides a second input device, which publishes the raw accelerometer + measurements (without the fuzzing needed for joystick emulation). This input + device can be matched by a udev rule such as the following (all on one line): + KERNEL=="event[0-9]*", ATTRS{phys}=="hdaps/input1", + ATTRS{modalias}=="input:b0019v1014p5054e4801-*", + SYMLINK+="input/hdaps/accelerometer-event + +A new version of the hdapsd userspace daemon, which uses the input device +interface instead of polling sysfs, is available seprately. Using this reduces +the total interrupts per second generated by hdaps+hdapsd (on tickless kernels) +to 50, down from a value that fluctuates between 50 and 100. Set the +sampling_rate sysfs attribute to a lower value to further reduce interrupts, +at the expense of response latency. + +Licensing note: all my changes to the HDAPS driver are licensed under the +GPL version 2 or, at your option and to the extent allowed by derivation from +prior works, any later version. My version of hdaps is derived work from the +mainline version, which at the time of writing is available only under +GPL version 2. + +Bug reporting +------------- + +Mail . Please include: +* Details about your model, +* Relevant "dmesg" output. Make sure thinkpad_ec and tp_smapi are loaded with + the "debug=1" parameter (e.g., use "make load HDAPS=1 DEBUG=1"). +* Output of "dmidecode | grep -C5 Product" +* Does the failed functionality works under Windows? + + +More about SMAPI +---------------- + +For hints about what may be possible via the SMAPI BIOS and how, see: + +* IBM Technical Reference Manual for the ThinkPad 770 + (http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=PFAN-3TUQQD) +* Exported symbols in PWRMGRIF.DLL or TPPWRW32.DLL (e.g., use "objdump -x"). +* drivers/char/mwave/smapi.c in the Linux kernel tree.* +* The "thinkpad" SMAPI module (http://tpctl.sourceforge.net). +* The SMAPI_* constants in tp_smapi.c. + +Note that in the above Technical Reference and in the "thinkpad" module, +SMAPI is invoked through a function call to some physical address. However, +the interface used by tp_smapi and the above mwave drive, and apparently +required by newer ThinkPad, is different: you set the parameters up in the +CPU's registers and write to ports 0xB2 (the APM control port) and 0x4F; this +triggers an SMI (System Management Interrupt), causing the CPU to enter +SMM (System Management Mode) and run the BIOS firmware; the results are +returned in the CPU's registers. It is not clear what is the relation between +the two variants of SMAPI, though the assignment of error codes seems to be +similar. + +In addition, the embedded controller on ThinkPad laptops has a non-standard +interface at IO ports 0x1600-0x161F (mapped to LCP channel 3 of the H8S chip). +The interface provides various system management services (currently known: +battery information and accelerometer readouts). For more information see the +thinkpad_ec module and the H8S hardware documentation: +http://documentation.renesas.com/eng/products/mpumcu/rej09b0300_2140bhm.pdf diff --git a/Makefile b/Makefile index 8280953c8a45162a..30145b636a9bb9ea 100644 --- a/Makefile +++ b/Makefile @@ -1,8 +1,8 @@ VERSION = 4 PATCHLEVEL = 13 SUBLEVEL = 11 -EXTRAVERSION = -gnu +EXTRAVERSION = -pck NAME = Fearless Coyote # *DOCUMENTATION* # To see a list of typical targets execute "make help" @@ -638,12 +638,16 @@ ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) else +ifdef CONFIG_CC_OPTIMIZE_HARDER +KBUILD_CFLAGS += -O3 $(call cc-disable-warning,maybe-uninitialized,) +else ifdef CONFIG_PROFILE_ALL_BRANCHES KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) else KBUILD_CFLAGS += -O2 endif endif +endif KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ $(call cc-disable-warning,maybe-uninitialized,)) diff --git a/arch/powerpc/platforms/cell/spufs/sched.c b/arch/powerpc/platforms/cell/spufs/sched.c index 1fbb5da17dd27ffa..29a929e61f766055 100644 --- a/arch/powerpc/platforms/cell/spufs/sched.c +++ b/arch/powerpc/platforms/cell/spufs/sched.c @@ -64,11 +64,6 @@ static struct task_struct *spusched_task; static struct timer_list spusched_timer; static struct timer_list spuloadavg_timer; -/* - * Priority of a normal, non-rt, non-niced'd process (aka nice level 0). - */ -#define NORMAL_PRIO 120 - /* * Frequency of the spu scheduler tick. By default we do one SPU scheduler * tick for every 10 CPU scheduler ticks. diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 323cb065be5eda12..ac5e3ef34526334e 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -945,10 +945,26 @@ config SCHED_SMT depends on SMP ---help--- SMT scheduler support improves the CPU scheduler's decision making - when dealing with Intel Pentium 4 chips with HyperThreading at a + when dealing with Intel P4/Core 2 chips with HyperThreading at a cost of slightly increased overhead in some places. If unsure say N here. +config SMT_NICE + bool "SMT (Hyperthreading) aware nice priority and policy support" + depends on SCHED_MUQSS && SCHED_SMT + default y + ---help--- + Enabling Hyperthreading on Intel CPUs decreases the effectiveness + of the use of 'nice' levels and different scheduling policies + (e.g. realtime) due to sharing of CPU power between hyperthreads. + SMT nice support makes each logical CPU aware of what is running on + its hyperthread siblings, maintaining appropriate distribution of + CPU according to nice levels and scheduling policies at the expense + of slightly increased overhead. + + If unsure say Y here. + + config SCHED_MC def_bool y prompt "Multi-core scheduler support" diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu index 3ba5ff2f2d082b36..893ba158db2a65fc 100644 --- a/arch/x86/Kconfig.cpu +++ b/arch/x86/Kconfig.cpu @@ -115,6 +115,7 @@ config MPENTIUMM config MPENTIUM4 bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon" depends on X86_32 + select X86_P6_NOP ---help--- Select this for Intel Pentium 4 chips. This includes the Pentium 4, Pentium D, P4-based Celeron and Xeon, and @@ -147,30 +148,100 @@ config MPENTIUM4 -Paxville -Dempsey - config MK6 - bool "K6/K6-II/K6-III" + bool "AMD K6/K6-II/K6-III" depends on X86_32 ---help--- Select this for an AMD K6-family processor. Enables use of some extended instructions, and passes appropriate optimization flags to GCC. config MK7 - bool "Athlon/Duron/K7" + bool "AMD Athlon/Duron/K7" depends on X86_32 ---help--- Select this for an AMD Athlon K7-family processor. Enables use of some extended instructions, and passes appropriate optimization flags to GCC. config MK8 - bool "Opteron/Athlon64/Hammer/K8" + bool "AMD Opteron/Athlon64/Hammer/K8" ---help--- Select this for an AMD Opteron or Athlon64 Hammer-family processor. Enables use of some extended instructions, and passes appropriate optimization flags to GCC. +config MK8SSE3 + bool "AMD Opteron/Athlon64/Hammer/K8 with SSE3" + ---help--- + Select this for improved AMD Opteron or Athlon64 Hammer-family processors. + Enables use of some extended instructions, and passes appropriate + optimization flags to GCC. + +config MK10 + bool "AMD 61xx/7x50/PhenomX3/X4/II/K10" + ---help--- + Select this for an AMD 61xx Eight-Core Magny-Cours, Athlon X2 7x50, + Phenom X3/X4/II, Athlon II X2/X3/X4, or Turion II-family processor. + Enables use of some extended instructions, and passes appropriate + optimization flags to GCC. + +config MBARCELONA + bool "AMD Barcelona" + ---help--- + Select this for AMD Family 10h Barcelona processors. + + Enables -march=barcelona + +config MBOBCAT + bool "AMD Bobcat" + ---help--- + Select this for AMD Family 14h Bobcat processors. + + Enables -march=btver1 + +config MJAGUAR + bool "AMD Jaguar" + ---help--- + Select this for AMD Family 16h Jaguar processors. + + Enables -march=btver2 + +config MBULLDOZER + bool "AMD Bulldozer" + ---help--- + Select this for AMD Family 15h Bulldozer processors. + + Enables -march=bdver1 + +config MPILEDRIVER + bool "AMD Piledriver" + ---help--- + Select this for AMD Family 15h Piledriver processors. + + Enables -march=bdver2 + +config MSTEAMROLLER + bool "AMD Steamroller" + ---help--- + Select this for AMD Family 15h Steamroller processors. + + Enables -march=bdver3 + +config MEXCAVATOR + bool "AMD Excavator" + ---help--- + Select this for AMD Family 15h Excavator processors. + + Enables -march=bdver4 + +config MPCK + bool "AMD Zen" + ---help--- + Select this for AMD Family 17h Zen processors. + + Enables -march=znver1 + config MCRUSOE bool "Crusoe" depends on X86_32 @@ -252,65 +323,155 @@ config MVIAC7 config MPSC bool "Intel P4 / older Netburst based Xeon" + select X86_P6_NOP depends on X86_64 ---help--- Optimize for Intel Pentium 4, Pentium D and older Nocona/Dempsey Xeon CPUs with Intel 64bit which is compatible with x86-64. Note that the latest Xeons (Xeon 51xx and 53xx) are not based on the Netburst core and shouldn't use this option. You can distinguish them using the cpu family field in /proc/cpuinfo. Family 15 is an older Xeon, Family 6 a newer one. -config MCORE2 - bool "Core 2/newer Xeon" - ---help--- - - Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and - 53xx) CPUs. You can distinguish newer from older Xeons by the CPU - family in /proc/cpuinfo. Newer ones have 6 and older ones 15 - (not a typo) - config MATOM bool "Intel Atom" + select X86_P6_NOP ---help--- Select this for the Intel Atom platform. Intel Atom CPUs have an in-order pipelining architecture and thus can benefit from accordingly optimized code. Use a recent GCC with specific Atom support in order to fully benefit from selecting this option. +config MCORE2 + bool "Intel Core 2" + select X86_P6_NOP + ---help--- + + Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and + 53xx) CPUs. You can distinguish newer from older Xeons by the CPU + family in /proc/cpuinfo. Newer ones have 6 and older ones 15 + (not a typo) + + Enables -march=core2 + +config MNEHALEM + bool "Intel Nehalem" + select X86_P6_NOP + ---help--- + + Select this for 1st Gen Core processors in the Nehalem family. + + Enables -march=nehalem + +config MWESTMERE + bool "Intel Westmere" + select X86_P6_NOP + ---help--- + + Select this for the Intel Westmere formerly Nehalem-C family. + + Enables -march=westmere + +config MSILVERMONT + bool "Intel Silvermont" + select X86_P6_NOP + ---help--- + + Select this for the Intel Silvermont platform. + + Enables -march=silvermont + +config MSANDYBRIDGE + bool "Intel Sandy Bridge" + select X86_P6_NOP + ---help--- + + Select this for 2nd Gen Core processors in the Sandy Bridge family. + + Enables -march=sandybridge + +config MIVYBRIDGE + bool "Intel Ivy Bridge" + select X86_P6_NOP + ---help--- + + Select this for 3rd Gen Core processors in the Ivy Bridge family. + + Enables -march=ivybridge + +config MHASWELL + bool "Intel Haswell" + select X86_P6_NOP + ---help--- + + Select this for 4th Gen Core processors in the Haswell family. + + Enables -march=haswell + +config MBROADWELL + bool "Intel Broadwell" + select X86_P6_NOP + ---help--- + + Select this for 5th Gen Core processors in the Broadwell family. + + Enables -march=broadwell + +config MSKYLAKE + bool "Intel Skylake" + select X86_P6_NOP + ---help--- + + Select this for 6th Gen Core processors in the Skylake family. + + Enables -march=skylake + config GENERIC_CPU bool "Generic-x86-64" depends on X86_64 ---help--- Generic x86-64 CPU. Run equally well on all x86-64 CPUs. +config MNATIVE + bool "Native optimizations autodetected by GCC" + ---help--- + + GCC 4.2 and above support -march=native, which automatically detects + the optimum settings to use based on your processor. -march=native + also detects and applies additional settings beyond -march specific + to your CPU, (eg. -msse4). Unless you have a specific reason not to + (e.g. distcc cross-compiling), you should probably be using + -march=native rather than anything listed below. + + Enables -march=native + endchoice config X86_GENERIC bool "Generic x86 support" depends on X86_32 ---help--- Instead of just including optimizations for the selected x86 variant (e.g. PII, Crusoe or Athlon), include some more generic optimizations as well. This will make the kernel perform better on x86 CPUs other than that selected. This is really intended for distributors who need more generic optimizations. # # Define implied options from the CPU selection here config X86_INTERNODE_CACHE_SHIFT int default "12" if X86_VSMP default X86_L1_CACHE_SHIFT config X86_L1_CACHE_SHIFT int default "7" if MPENTIUM4 || MPSC - default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MATOM || MVIAC7 || X86_GENERIC || GENERIC_CPU + default "6" if MK7 || MK8 || MK8SSE3 || MK10 || MBARCELONA || MBOBCAT || MBULLDOZER || MPILEDRIVER || MSTEAMROLLER || MEXCAVATOR || MPCK || MJAGUAR || MPENTIUMM || MCORE2 || MNEHALEM || MWESTMERE || MSILVERMONT || MSANDYBRIDGE || MIVYBRIDGE || MHASWELL || MBROADWELL || MSKYLAKE || MNATIVE || MATOM || MVIAC7 || X86_GENERIC || GENERIC_CPU default "4" if MELAN || M486 || MGEODEGX1 default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX @@ -341,45 +502,46 @@ config X86_ALIGNMENT_16 config X86_INTEL_USERCOPY def_bool y - depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2 + depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK8SSE3 || MK7 || MEFFICEON || MCORE2 || MK10 || MBARCELONA || MNEHALEM || MWESTMERE || MSILVERMONT || MSANDYBRIDGE || MIVYBRIDGE || MHASWELL || MBROADWELL || MSKYLAKE || MNATIVE config X86_USE_PPRO_CHECKSUM def_bool y - depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MCORE2 || MATOM + depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MK10 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MK8SSE3 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MCORE2 || MNEHALEM || MWESTMERE || MSILVERMONT || MSANDYBRIDGE || MIVYBRIDGE || MHASWELL || MBROADWELL || MSKYLAKE || MATOM || MNATIVE config X86_USE_3DNOW def_bool y depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML -# -# P6_NOPs are a relatively minor optimization that require a family >= -# 6 processor, except that it is broken on certain VIA chips. -# Furthermore, AMD chips prefer a totally different sequence of NOPs -# (which work on all CPUs). In addition, it looks like Virtual PC -# does not understand them. -# -# As a result, disallow these if we're not compiling for X86_64 (these -# NOPs do work on all x86-64 capable chips); the list of processors in -# the right-hand clause are the cores that benefit from this optimization. -# config X86_P6_NOP - def_bool y - depends on X86_64 - depends on (MCORE2 || MPENTIUM4 || MPSC) + default n + bool "Support for P6_NOPs on Intel chips" + depends on (MCORE2 || MPENTIUM4 || MPSC || MATOM || MNEHALEM || MWESTMERE || MSILVERMONT || MSANDYBRIDGE || MIVYBRIDGE || MHASWELL || MBROADWELL || MSKYLAKE || MNATIVE) + ---help--- + P6_NOPs are a relatively minor optimization that require a family >= + 6 processor, except that it is broken on certain VIA chips. + Furthermore, AMD chips prefer a totally different sequence of NOPs + (which work on all CPUs). In addition, it looks like Virtual PC + does not understand them. + + As a result, disallow these if we're not compiling for X86_64 (these + NOPs do work on all x86-64 capable chips); the list of processors in + the right-hand clause are the cores that benefit from this optimization. + + Say Y if you have Intel CPU newer than Pentium Pro, N otherwise. config X86_TSC def_bool y - depends on (MWINCHIP3D || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MVIAC7 || MGEODEGX1 || MGEODE_LX || MCORE2 || MATOM) || X86_64 + depends on (MWINCHIP3D || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MK8SSE3 || MVIAC3_2 || MVIAC7 || MGEODEGX1 || MGEODE_LX || MCORE2 || MNEHALEM || MWESTMERE || MSILVERMONT || MSANDYBRIDGE || MIVYBRIDGE || MHASWELL || MBROADWELL || MSKYLAKE || MNATIVE || MATOM) || X86_64 config X86_CMPXCHG64 def_bool y - depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MATOM + depends on X86_PAE || X86_64 || MCORE2 || MNEHALEM || MWESTMERE || MSILVERMONT || MSANDYBRIDGE || MIVYBRIDGE || MHASWELL || MBROADWELL || MSKYLAKE || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MATOM || MNATIVE # this should be set for all -march=.. options where the compiler # generates cmov. config X86_CMOV def_bool y - depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM || MGEODE_LX) + depends on (MK8 || MK8SSE3 || MK10 || MBARCELONA || MBOBCAT || MBULLDOZER || MPILEDRIVER || MSTEAMROLLER || MEXCAVATOR || MPCK || MJAGUAR || MK7 || MCORE2 || MNEHALEM || MWESTMERE || MSILVERMONT || MSANDYBRIDGE || MIVYBRIDGE || MHASWELL || MBROADWELL || MSKYLAKE || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MNATIVE || MATOM || MGEODE_LX) config X86_MINIMUM_CPU_FAMILY int diff --git a/arch/x86/Makefile b/arch/x86/Makefile index 1e902f926be3fd2d..402174752e734d05 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -121,13 +121,40 @@ else KBUILD_CFLAGS += $(call cc-option,-mskip-rax-setup) # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu) + cflags-$(CONFIG_MNATIVE) += $(call cc-option,-march=native) cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8) + cflags-$(CONFIG_MK8SSE3) += $(call cc-option,-march=k8-sse3,-mtune=k8) + cflags-$(CONFIG_MK10) += $(call cc-option,-march=amdfam10) + cflags-$(CONFIG_MBARCELONA) += $(call cc-option,-march=barcelona) + cflags-$(CONFIG_MBOBCAT) += $(call cc-option,-march=btver1) + cflags-$(CONFIG_MJAGUAR) += $(call cc-option,-march=btver2) + cflags-$(CONFIG_MBULLDOZER) += $(call cc-option,-march=bdver1) + cflags-$(CONFIG_MPILEDRIVER) += $(call cc-option,-march=bdver2) + cflags-$(CONFIG_MSTEAMROLLER) += $(call cc-option,-march=bdver3) + cflags-$(CONFIG_MEXCAVATOR) += $(call cc-option,-march=bdver4) + cflags-$(CONFIG_MPCK) += $(call cc-option,-march=znver1) cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona) cflags-$(CONFIG_MCORE2) += \ - $(call cc-option,-march=core2,$(call cc-option,-mtune=generic)) - cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \ - $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic)) + $(call cc-option,-march=core2,$(call cc-option,-mtune=core2)) + cflags-$(CONFIG_MNEHALEM) += \ + $(call cc-option,-march=nehalem,$(call cc-option,-mtune=nehalem)) + cflags-$(CONFIG_MWESTMERE) += \ + $(call cc-option,-march=westmere,$(call cc-option,-mtune=westmere)) + cflags-$(CONFIG_MSILVERMONT) += \ + $(call cc-option,-march=silvermont,$(call cc-option,-mtune=silvermont)) + cflags-$(CONFIG_MSANDYBRIDGE) += \ + $(call cc-option,-march=sandybridge,$(call cc-option,-mtune=sandybridge)) + cflags-$(CONFIG_MIVYBRIDGE) += \ + $(call cc-option,-march=ivybridge,$(call cc-option,-mtune=ivybridge)) + cflags-$(CONFIG_MHASWELL) += \ + $(call cc-option,-march=haswell,$(call cc-option,-mtune=haswell)) + cflags-$(CONFIG_MBROADWELL) += \ + $(call cc-option,-march=broadwell,$(call cc-option,-mtune=broadwell)) + cflags-$(CONFIG_MSKYLAKE) += \ + $(call cc-option,-march=skylake,$(call cc-option,-mtune=skylake)) + cflags-$(CONFIG_MATOM) += $(call cc-option,-march=bonnell) \ + $(call cc-option,-mtune=bonnell,$(call cc-option,-mtune=generic)) cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic) KBUILD_CFLAGS += $(cflags-y) diff --git a/arch/x86/Makefile_32.cpu b/arch/x86/Makefile_32.cpu index f3717d36718a5974..84418cce5ad621d7 100644 --- a/arch/x86/Makefile_32.cpu +++ b/arch/x86/Makefile_32.cpu @@ -22,17 +22,36 @@ cflags-$(CONFIG_MK6) += -march=k6 # Please note, that patches that add -march=athlon-xp and friends are pointless. # They make zero difference whatsosever to performance at this time. cflags-$(CONFIG_MK7) += -march=athlon +cflags-$(CONFIG_MNATIVE) += $(call cc-option,-march=native) cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8,-march=athlon) +cflags-$(CONFIG_MK8SSE3) += $(call cc-option,-march=k8-sse3,-march=athlon) +cflags-$(CONFIG_MK10) += $(call cc-option,-march=amdfam10,-march=athlon) +cflags-$(CONFIG_MBARCELONA) += $(call cc-option,-march=barcelona,-march=athlon) +cflags-$(CONFIG_MBOBCAT) += $(call cc-option,-march=btver1,-march=athlon) +cflags-$(CONFIG_MJAGUAR) += $(call cc-option,-march=btver2,-march=athlon) +cflags-$(CONFIG_MBULLDOZER) += $(call cc-option,-march=bdver1,-march=athlon) +cflags-$(CONFIG_MPILEDRIVER) += $(call cc-option,-march=bdver2,-march=athlon) +cflags-$(CONFIG_MSTEAMROLLER) += $(call cc-option,-march=bdver3,-march=athlon) +cflags-$(CONFIG_MEXCAVATOR) += $(call cc-option,-march=bdver4,-march=athlon) +cflags-$(CONFIG_MPCK) += $(call cc-option,-march=znver1,-march=athlon) cflags-$(CONFIG_MCRUSOE) += -march=i686 -falign-functions=0 -falign-jumps=0 -falign-loops=0 cflags-$(CONFIG_MEFFICEON) += -march=i686 $(call tune,pentium3) -falign-functions=0 -falign-jumps=0 -falign-loops=0 cflags-$(CONFIG_MWINCHIPC6) += $(call cc-option,-march=winchip-c6,-march=i586) cflags-$(CONFIG_MWINCHIP3D) += $(call cc-option,-march=winchip2,-march=i586) cflags-$(CONFIG_MCYRIXIII) += $(call cc-option,-march=c3,-march=i486) -falign-functions=0 -falign-jumps=0 -falign-loops=0 cflags-$(CONFIG_MVIAC3_2) += $(call cc-option,-march=c3-2,-march=i686) cflags-$(CONFIG_MVIAC7) += -march=i686 cflags-$(CONFIG_MCORE2) += -march=i686 $(call tune,core2) -cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom,$(call cc-option,-march=core2,-march=i686)) \ - $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic)) +cflags-$(CONFIG_MNEHALEM) += -march=i686 $(call tune,nehalem) +cflags-$(CONFIG_MWESTMERE) += -march=i686 $(call tune,westmere) +cflags-$(CONFIG_MSILVERMONT) += -march=i686 $(call tune,silvermont) +cflags-$(CONFIG_MSANDYBRIDGE) += -march=i686 $(call tune,sandybridge) +cflags-$(CONFIG_MIVYBRIDGE) += -march=i686 $(call tune,ivybridge) +cflags-$(CONFIG_MHASWELL) += -march=i686 $(call tune,haswell) +cflags-$(CONFIG_MBROADWELL) += -march=i686 $(call tune,broadwell) +cflags-$(CONFIG_MSKYLAKE) += -march=i686 $(call tune,skylake) +cflags-$(CONFIG_MATOM) += $(call cc-option,-march=bonnell,$(call cc-option,-march=core2,-march=i686)) \ + $(call cc-option,-mtune=bonnell,$(call cc-option,-mtune=generic)) # AMD Elan support cflags-$(CONFIG_MELAN) += -march=i486 diff --git a/arch/x86/include/asm/module.h b/arch/x86/include/asm/module.h index e3b7819caeef1c81..470307f813d52641 100644 --- a/arch/x86/include/asm/module.h +++ b/arch/x86/include/asm/module.h @@ -15,24 +15,62 @@ #define MODULE_PROC_FAMILY "586MMX " #elif defined CONFIG_MCORE2 #define MODULE_PROC_FAMILY "CORE2 " +#elif defined CONFIG_MNATIVE +#define MODULE_PROC_FAMILY "NATIVE " +#elif defined CONFIG_MNEHALEM +#define MODULE_PROC_FAMILY "NEHALEM " +#elif defined CONFIG_MWESTMERE +#define MODULE_PROC_FAMILY "WESTMERE " +#elif defined CONFIG_MSILVERMONT +#define MODULE_PROC_FAMILY "SILVERMONT " +#elif defined CONFIG_MSANDYBRIDGE +#define MODULE_PROC_FAMILY "SANDYBRIDGE " +#elif defined CONFIG_MIVYBRIDGE +#define MODULE_PROC_FAMILY "IVYBRIDGE " +#elif defined CONFIG_MHASWELL +#define MODULE_PROC_FAMILY "HASWELL " +#elif defined CONFIG_MBROADWELL +#define MODULE_PROC_FAMILY "BROADWELL " +#elif defined CONFIG_MSKYLAKE +#define MODULE_PROC_FAMILY "SKYLAKE " #elif defined CONFIG_MATOM #define MODULE_PROC_FAMILY "ATOM " #elif defined CONFIG_M686 #define MODULE_PROC_FAMILY "686 " #elif defined CONFIG_MPENTIUMII #define MODULE_PROC_FAMILY "PENTIUMII " #elif defined CONFIG_MPENTIUMIII #define MODULE_PROC_FAMILY "PENTIUMIII " #elif defined CONFIG_MPENTIUMM #define MODULE_PROC_FAMILY "PENTIUMM " #elif defined CONFIG_MPENTIUM4 #define MODULE_PROC_FAMILY "PENTIUM4 " #elif defined CONFIG_MK6 #define MODULE_PROC_FAMILY "K6 " #elif defined CONFIG_MK7 #define MODULE_PROC_FAMILY "K7 " #elif defined CONFIG_MK8 #define MODULE_PROC_FAMILY "K8 " +#elif defined CONFIG_MK8SSE3 +#define MODULE_PROC_FAMILY "K8SSE3 " +#elif defined CONFIG_MK10 +#define MODULE_PROC_FAMILY "K10 " +#elif defined CONFIG_MBARCELONA +#define MODULE_PROC_FAMILY "BARCELONA " +#elif defined CONFIG_MBOBCAT +#define MODULE_PROC_FAMILY "BOBCAT " +#elif defined CONFIG_MBULLDOZER +#define MODULE_PROC_FAMILY "BULLDOZER " +#elif defined CONFIG_MPILEDRIVER +#define MODULE_PROC_FAMILY "PILEDRIVER " +#elif defined CONFIG_MSTEAMROLLER +#define MODULE_PROC_FAMILY "STEAMROLLER " +#elif defined CONFIG_MJAGUAR +#define MODULE_PROC_FAMILY "JAGUAR " +#elif defined CONFIG_MEXCAVATOR +#define MODULE_PROC_FAMILY "EXCAVATOR " +#elif defined CONFIG_MPCK +#define MODULE_PROC_FAMILY "PCK " #elif defined CONFIG_MELAN #define MODULE_PROC_FAMILY "ELAN " #elif defined CONFIG_MCRUSOE diff --git a/block/Kconfig.iosched b/block/Kconfig.iosched index fd2cefa47d354fae..9defb306c075d38f 100644 --- a/block/Kconfig.iosched +++ b/block/Kconfig.iosched @@ -39,31 +39,81 @@ config CFQ_GROUP_IOSCHED ---help--- Enable group IO scheduling in CFQ. +config IOSCHED_BFQ_SQ + tristate "BFQ-SQ I/O scheduler" + default n + ---help--- + The BFQ-SQ I/O scheduler (for legacy blk: SQ stands for + SingleQueue) distributes bandwidth among all processes + according to their weights, regardless of the device + parameters and with any workload. It also guarantees a low + latency to interactive and soft real-time applications. + Details in Documentation/block/bfq-iosched.txt + +config BFQ_SQ_GROUP_IOSCHED + bool "BFQ-SQ hierarchical scheduling support" + depends on IOSCHED_BFQ_SQ && BLK_CGROUP + default n + ---help--- + + Enable hierarchical scheduling in BFQ-SQ, using the blkio + (cgroups-v1) or io (cgroups-v2) controller. + choice prompt "Default I/O scheduler" default DEFAULT_CFQ help Select the I/O scheduler which will be used by default for all block devices. config DEFAULT_DEADLINE bool "Deadline" if IOSCHED_DEADLINE=y config DEFAULT_CFQ bool "CFQ" if IOSCHED_CFQ=y + config DEFAULT_BFQ_SQ + bool "BFQ-SQ" if IOSCHED_BFQ_SQ=y + help + Selects BFQ-SQ as the default I/O scheduler which will be + used by default for all block devices. + The BFQ-SQ I/O scheduler aims at distributing the bandwidth + as desired, independently of the disk parameters and with + any workload. It also tries to guarantee low latency to + interactive and soft real-time applications. + config DEFAULT_NOOP bool "No-op" endchoice config DEFAULT_IOSCHED string default "deadline" if DEFAULT_DEADLINE default "cfq" if DEFAULT_CFQ + default "bfq-sq" if DEFAULT_BFQ_SQ default "noop" if DEFAULT_NOOP +config MQ_IOSCHED_BFQ + tristate "BFQ-MQ I/O Scheduler" + default y + ---help--- + BFQ I/O scheduler for BLK-MQ. BFQ-MQ distributes bandwidth + among all processes according to their weights, regardless of + the device parameters and with any workload. It also + guarantees a low latency to interactive and soft real-time + applications. Details in Documentation/block/bfq-iosched.txt + +config MQ_BFQ_GROUP_IOSCHED + bool "BFQ-MQ hierarchical scheduling support" + depends on MQ_IOSCHED_BFQ && BLK_CGROUP + default n + ---help--- + + Enable hierarchical scheduling in BFQ-MQ, using the blkio + (cgroups-v1) or io (cgroups-v2) controller. + config MQ_IOSCHED_DEADLINE tristate "MQ deadline I/O scheduler" default y diff --git a/block/Makefile b/block/Makefile index 2b281cf258a0abda..40b9b5d367617ce7 100644 --- a/block/Makefile +++ b/block/Makefile @@ -23,6 +23,8 @@ obj-$(CONFIG_MQ_IOSCHED_DEADLINE) += mq-deadline.o obj-$(CONFIG_MQ_IOSCHED_KYBER) += kyber-iosched.o bfq-y := bfq-iosched.o bfq-wf2q.o bfq-cgroup.o obj-$(CONFIG_IOSCHED_BFQ) += bfq.o +obj-$(CONFIG_IOSCHED_BFQ_SQ) += bfq-sq-iosched.o +obj-$(CONFIG_MQ_IOSCHED_BFQ) += bfq-mq-iosched.o obj-$(CONFIG_BLOCK_COMPAT) += compat_ioctl.o obj-$(CONFIG_BLK_CMDLINE_PARSER) += cmdline-parser.o diff --git a/block/bfq-cgroup-included.c b/block/bfq-cgroup-included.c new file mode 100644 index 0000000000000000..631e53d9150d7506 --- /dev/null +++ b/block/bfq-cgroup-included.c @@ -0,0 +1,1329 @@ +/* + * BFQ: CGROUPS support. + * + * Based on ideas and code from CFQ: + * Copyright (C) 2003 Jens Axboe + * + * Copyright (C) 2008 Fabio Checconi + * Paolo Valente + * + * Copyright (C) 2015 Paolo Valente + * + * Copyright (C) 2016 Paolo Valente + * + * Licensed under the GPL-2 as detailed in the accompanying COPYING.BFQ + * file. + */ + +#ifdef BFQ_GROUP_IOSCHED_ENABLED + +/* bfqg stats flags */ +enum bfqg_stats_flags { + BFQG_stats_waiting = 0, + BFQG_stats_idling, + BFQG_stats_empty, +}; + +#define BFQG_FLAG_FNS(name) \ +static void bfqg_stats_mark_##name(struct bfqg_stats *stats) \ +{ \ + stats->flags |= (1 << BFQG_stats_##name); \ +} \ +static void bfqg_stats_clear_##name(struct bfqg_stats *stats) \ +{ \ + stats->flags &= ~(1 << BFQG_stats_##name); \ +} \ +static int bfqg_stats_##name(struct bfqg_stats *stats) \ +{ \ + return (stats->flags & (1 << BFQG_stats_##name)) != 0; \ +} \ + +BFQG_FLAG_FNS(waiting) +BFQG_FLAG_FNS(idling) +BFQG_FLAG_FNS(empty) +#undef BFQG_FLAG_FNS + +#ifdef BFQ_MQ +/* This should be called with the scheduler lock held. */ +#else +/* This should be called with the queue_lock held. */ +#endif +static void bfqg_stats_update_group_wait_time(struct bfqg_stats *stats) +{ + unsigned long long now; + + if (!bfqg_stats_waiting(stats)) + return; + + now = sched_clock(); + if (time_after64(now, stats->start_group_wait_time)) + blkg_stat_add(&stats->group_wait_time, + now - stats->start_group_wait_time); + bfqg_stats_clear_waiting(stats); +} + +#ifdef BFQ_MQ +/* This should be called with the scheduler lock held. */ +#else +/* This should be called with the queue_lock held. */ +#endif +static void bfqg_stats_set_start_group_wait_time(struct bfq_group *bfqg, + struct bfq_group *curr_bfqg) +{ + struct bfqg_stats *stats = &bfqg->stats; + + if (bfqg_stats_waiting(stats)) + return; + if (bfqg == curr_bfqg) + return; + stats->start_group_wait_time = sched_clock(); + bfqg_stats_mark_waiting(stats); +} + +#ifdef BFQ_MQ +/* This should be called with the scheduler lock held. */ +#else +/* This should be called with the queue_lock held. */ +#endif +static void bfqg_stats_end_empty_time(struct bfqg_stats *stats) +{ + unsigned long long now; + + if (!bfqg_stats_empty(stats)) + return; + + now = sched_clock(); + if (time_after64(now, stats->start_empty_time)) + blkg_stat_add(&stats->empty_time, + now - stats->start_empty_time); + bfqg_stats_clear_empty(stats); +} + +static void bfqg_stats_update_dequeue(struct bfq_group *bfqg) +{ + blkg_stat_add(&bfqg->stats.dequeue, 1); +} + +static void bfqg_stats_set_start_empty_time(struct bfq_group *bfqg) +{ + struct bfqg_stats *stats = &bfqg->stats; + + if (blkg_rwstat_total(&stats->queued)) + return; + + /* + * group is already marked empty. This can happen if bfqq got new + * request in parent group and moved to this group while being added + * to service tree. Just ignore the event and move on. + */ + if (bfqg_stats_empty(stats)) + return; + + stats->start_empty_time = sched_clock(); + bfqg_stats_mark_empty(stats); +} + +static void bfqg_stats_update_idle_time(struct bfq_group *bfqg) +{ + struct bfqg_stats *stats = &bfqg->stats; + + if (bfqg_stats_idling(stats)) { + unsigned long long now = sched_clock(); + + if (time_after64(now, stats->start_idle_time)) + blkg_stat_add(&stats->idle_time, + now - stats->start_idle_time); + bfqg_stats_clear_idling(stats); + } +} + +static void bfqg_stats_set_start_idle_time(struct bfq_group *bfqg) +{ + struct bfqg_stats *stats = &bfqg->stats; + + stats->start_idle_time = sched_clock(); + bfqg_stats_mark_idling(stats); +} + +static void bfqg_stats_update_avg_queue_size(struct bfq_group *bfqg) +{ + struct bfqg_stats *stats = &bfqg->stats; + + blkg_stat_add(&stats->avg_queue_size_sum, + blkg_rwstat_total(&stats->queued)); + blkg_stat_add(&stats->avg_queue_size_samples, 1); + bfqg_stats_update_group_wait_time(stats); +} + +static struct blkcg_policy blkcg_policy_bfq; + +/* + * blk-cgroup policy-related handlers + * The following functions help in converting between blk-cgroup + * internal structures and BFQ-specific structures. + */ + +static struct bfq_group *pd_to_bfqg(struct blkg_policy_data *pd) +{ + return pd ? container_of(pd, struct bfq_group, pd) : NULL; +} + +static struct blkcg_gq *bfqg_to_blkg(struct bfq_group *bfqg) +{ + return pd_to_blkg(&bfqg->pd); +} + +static struct bfq_group *blkg_to_bfqg(struct blkcg_gq *blkg) +{ + struct blkg_policy_data *pd = blkg_to_pd(blkg, &blkcg_policy_bfq); + + return pd_to_bfqg(pd); +} + +/* + * bfq_group handlers + * The following functions help in navigating the bfq_group hierarchy + * by allowing to find the parent of a bfq_group or the bfq_group + * associated to a bfq_queue. + */ + +static struct bfq_group *bfqg_parent(struct bfq_group *bfqg) +{ + struct blkcg_gq *pblkg = bfqg_to_blkg(bfqg)->parent; + + return pblkg ? blkg_to_bfqg(pblkg) : NULL; +} + +static struct bfq_group *bfqq_group(struct bfq_queue *bfqq) +{ + struct bfq_entity *group_entity = bfqq->entity.parent; + + return group_entity ? container_of(group_entity, struct bfq_group, + entity) : + bfqq->bfqd->root_group; +} + +/* + * The following two functions handle get and put of a bfq_group by + * wrapping the related blk-cgroup hooks. + */ + +static void bfqg_get(struct bfq_group *bfqg) +{ +#ifdef BFQ_MQ + bfqg->ref++; +#else + blkg_get(bfqg_to_blkg(bfqg)); +#endif +} + +static void bfqg_put(struct bfq_group *bfqg) +{ +#ifdef BFQ_MQ + bfqg->ref--; + + BUG_ON(bfqg->ref < 0); + if (bfqg->ref == 0) + kfree(bfqg); +#else + blkg_put(bfqg_to_blkg(bfqg)); +#endif +} + +#ifdef BFQ_MQ +static void bfqg_and_blkg_get(struct bfq_group *bfqg) +{ + /* see comments in bfq_bic_update_cgroup for why refcounting bfqg */ + bfqg_get(bfqg); + + blkg_get(bfqg_to_blkg(bfqg)); +} + +static void bfqg_and_blkg_put(struct bfq_group *bfqg) +{ + bfqg_put(bfqg); + + blkg_put(bfqg_to_blkg(bfqg)); +} +#endif + +static void bfqg_stats_update_io_add(struct bfq_group *bfqg, + struct bfq_queue *bfqq, + unsigned int op) +{ + blkg_rwstat_add(&bfqg->stats.queued, op, 1); + bfqg_stats_end_empty_time(&bfqg->stats); + if (!(bfqq == ((struct bfq_data *)bfqg->bfqd)->in_service_queue)) + bfqg_stats_set_start_group_wait_time(bfqg, bfqq_group(bfqq)); +} + +static void bfqg_stats_update_io_remove(struct bfq_group *bfqg, unsigned int op) +{ + blkg_rwstat_add(&bfqg->stats.queued, op, -1); +} + +static void bfqg_stats_update_io_merged(struct bfq_group *bfqg, unsigned int op) +{ + blkg_rwstat_add(&bfqg->stats.merged, op, 1); +} + +static void bfqg_stats_update_completion(struct bfq_group *bfqg, + uint64_t start_time, uint64_t io_start_time, + unsigned int op) +{ + struct bfqg_stats *stats = &bfqg->stats; + unsigned long long now = sched_clock(); + + if (time_after64(now, io_start_time)) + blkg_rwstat_add(&stats->service_time, op, + now - io_start_time); + if (time_after64(io_start_time, start_time)) + blkg_rwstat_add(&stats->wait_time, op, + io_start_time - start_time); +} + +/* @stats = 0 */ +static void bfqg_stats_reset(struct bfqg_stats *stats) +{ + /* queued stats shouldn't be cleared */ + blkg_rwstat_reset(&stats->merged); + blkg_rwstat_reset(&stats->service_time); + blkg_rwstat_reset(&stats->wait_time); + blkg_stat_reset(&stats->time); + blkg_stat_reset(&stats->avg_queue_size_sum); + blkg_stat_reset(&stats->avg_queue_size_samples); + blkg_stat_reset(&stats->dequeue); + blkg_stat_reset(&stats->group_wait_time); + blkg_stat_reset(&stats->idle_time); + blkg_stat_reset(&stats->empty_time); +} + +/* @to += @from */ +static void bfqg_stats_add_aux(struct bfqg_stats *to, struct bfqg_stats *from) +{ + if (!to || !from) + return; + + /* queued stats shouldn't be cleared */ + blkg_rwstat_add_aux(&to->merged, &from->merged); + blkg_rwstat_add_aux(&to->service_time, &from->service_time); + blkg_rwstat_add_aux(&to->wait_time, &from->wait_time); + blkg_stat_add_aux(&from->time, &from->time); + blkg_stat_add_aux(&to->avg_queue_size_sum, &from->avg_queue_size_sum); + blkg_stat_add_aux(&to->avg_queue_size_samples, + &from->avg_queue_size_samples); + blkg_stat_add_aux(&to->dequeue, &from->dequeue); + blkg_stat_add_aux(&to->group_wait_time, &from->group_wait_time); + blkg_stat_add_aux(&to->idle_time, &from->idle_time); + blkg_stat_add_aux(&to->empty_time, &from->empty_time); +} + +/* + * Transfer @bfqg's stats to its parent's dead_stats so that the ancestors' + * recursive stats can still account for the amount used by this bfqg after + * it's gone. + */ +static void bfqg_stats_xfer_dead(struct bfq_group *bfqg) +{ + struct bfq_group *parent; + + if (!bfqg) /* root_group */ + return; + + parent = bfqg_parent(bfqg); + + lockdep_assert_held(bfqg_to_blkg(bfqg)->q->queue_lock); + + if (unlikely(!parent)) + return; + + bfqg_stats_add_aux(&parent->stats, &bfqg->stats); + bfqg_stats_reset(&bfqg->stats); +} + +static void bfq_init_entity(struct bfq_entity *entity, + struct bfq_group *bfqg) +{ + struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); + + entity->weight = entity->new_weight; + entity->orig_weight = entity->new_weight; + if (bfqq) { + bfqq->ioprio = bfqq->new_ioprio; + bfqq->ioprio_class = bfqq->new_ioprio_class; +#ifdef BFQ_MQ + /* + * Make sure that bfqg and its associated blkg do not + * disappear before entity. + */ + bfqg_and_blkg_get(bfqg); +#else + bfqg_get(bfqg); +#endif + } + entity->parent = bfqg->my_entity; /* NULL for root group */ + entity->sched_data = &bfqg->sched_data; +} + +static void bfqg_stats_exit(struct bfqg_stats *stats) +{ + blkg_rwstat_exit(&stats->merged); + blkg_rwstat_exit(&stats->service_time); + blkg_rwstat_exit(&stats->wait_time); + blkg_rwstat_exit(&stats->queued); + blkg_stat_exit(&stats->time); + blkg_stat_exit(&stats->avg_queue_size_sum); + blkg_stat_exit(&stats->avg_queue_size_samples); + blkg_stat_exit(&stats->dequeue); + blkg_stat_exit(&stats->group_wait_time); + blkg_stat_exit(&stats->idle_time); + blkg_stat_exit(&stats->empty_time); +} + +static int bfqg_stats_init(struct bfqg_stats *stats, gfp_t gfp) +{ + if (blkg_rwstat_init(&stats->merged, gfp) || + blkg_rwstat_init(&stats->service_time, gfp) || + blkg_rwstat_init(&stats->wait_time, gfp) || + blkg_rwstat_init(&stats->queued, gfp) || + blkg_stat_init(&stats->time, gfp) || + blkg_stat_init(&stats->avg_queue_size_sum, gfp) || + blkg_stat_init(&stats->avg_queue_size_samples, gfp) || + blkg_stat_init(&stats->dequeue, gfp) || + blkg_stat_init(&stats->group_wait_time, gfp) || + blkg_stat_init(&stats->idle_time, gfp) || + blkg_stat_init(&stats->empty_time, gfp)) { + bfqg_stats_exit(stats); + return -ENOMEM; + } + + return 0; +} + +static struct bfq_group_data *cpd_to_bfqgd(struct blkcg_policy_data *cpd) +{ + return cpd ? container_of(cpd, struct bfq_group_data, pd) : NULL; +} + +static struct bfq_group_data *blkcg_to_bfqgd(struct blkcg *blkcg) +{ + return cpd_to_bfqgd(blkcg_to_cpd(blkcg, &blkcg_policy_bfq)); +} + +static struct blkcg_policy_data *bfq_cpd_alloc(gfp_t gfp) +{ + struct bfq_group_data *bgd; + + bgd = kzalloc(sizeof(*bgd), gfp); + if (!bgd) + return NULL; + return &bgd->pd; +} + +static void bfq_cpd_init(struct blkcg_policy_data *cpd) +{ + struct bfq_group_data *d = cpd_to_bfqgd(cpd); + + d->weight = cgroup_subsys_on_dfl(io_cgrp_subsys) ? + CGROUP_WEIGHT_DFL : BFQ_WEIGHT_LEGACY_DFL; +} + +static void bfq_cpd_free(struct blkcg_policy_data *cpd) +{ + kfree(cpd_to_bfqgd(cpd)); +} + +static struct blkg_policy_data *bfq_pd_alloc(gfp_t gfp, int node) +{ + struct bfq_group *bfqg; + + bfqg = kzalloc_node(sizeof(*bfqg), gfp, node); + if (!bfqg) + return NULL; + + if (bfqg_stats_init(&bfqg->stats, gfp)) { + kfree(bfqg); + return NULL; + } + +#ifdef BFQ_MQ + /* see comments in bfq_bic_update_cgroup for why refcounting */ + bfqg_get(bfqg); +#endif + return &bfqg->pd; +} + +static void bfq_pd_init(struct blkg_policy_data *pd) +{ + struct blkcg_gq *blkg; + struct bfq_group *bfqg; + struct bfq_data *bfqd; + struct bfq_entity *entity; + struct bfq_group_data *d; + + blkg = pd_to_blkg(pd); + BUG_ON(!blkg); + bfqg = blkg_to_bfqg(blkg); + bfqd = blkg->q->elevator->elevator_data; + BUG_ON(bfqg == bfqd->root_group); + entity = &bfqg->entity; + d = blkcg_to_bfqgd(blkg->blkcg); + + entity->orig_weight = entity->weight = entity->new_weight = d->weight; + entity->my_sched_data = &bfqg->sched_data; + bfqg->my_entity = entity; /* + * the root_group's will be set to NULL + * in bfq_init_queue() + */ + bfqg->bfqd = bfqd; + bfqg->active_entities = 0; + bfqg->rq_pos_tree = RB_ROOT; +} + +static void bfq_pd_free(struct blkg_policy_data *pd) +{ + struct bfq_group *bfqg = pd_to_bfqg(pd); + + bfqg_stats_exit(&bfqg->stats); +#ifdef BFQ_MQ + bfqg_put(bfqg); +#else + kfree(bfqg); +#endif +} + +static void bfq_pd_reset_stats(struct blkg_policy_data *pd) +{ + struct bfq_group *bfqg = pd_to_bfqg(pd); + + bfqg_stats_reset(&bfqg->stats); +} + +static void bfq_group_set_parent(struct bfq_group *bfqg, + struct bfq_group *parent) +{ + struct bfq_entity *entity; + + BUG_ON(!parent); + BUG_ON(!bfqg); + BUG_ON(bfqg == parent); + + entity = &bfqg->entity; + entity->parent = parent->my_entity; + entity->sched_data = &parent->sched_data; +} + +static struct bfq_group *bfq_lookup_bfqg(struct bfq_data *bfqd, + struct blkcg *blkcg) +{ + struct blkcg_gq *blkg; + + blkg = blkg_lookup(blkcg, bfqd->queue); + if (likely(blkg)) + return blkg_to_bfqg(blkg); + return NULL; +} + +static struct bfq_group *bfq_find_set_group(struct bfq_data *bfqd, + struct blkcg *blkcg) +{ + struct bfq_group *bfqg, *parent; + struct bfq_entity *entity; + + bfqg = bfq_lookup_bfqg(bfqd, blkcg); + + if (unlikely(!bfqg)) + return NULL; + + /* + * Update chain of bfq_groups as we might be handling a leaf group + * which, along with some of its relatives, has not been hooked yet + * to the private hierarchy of BFQ. + */ + entity = &bfqg->entity; + for_each_entity(entity) { + bfqg = container_of(entity, struct bfq_group, entity); + BUG_ON(!bfqg); + if (bfqg != bfqd->root_group) { + parent = bfqg_parent(bfqg); + if (!parent) + parent = bfqd->root_group; + BUG_ON(!parent); + bfq_group_set_parent(bfqg, parent); + } + } + + return bfqg; +} + +static void bfq_pos_tree_add_move(struct bfq_data *bfqd, + struct bfq_queue *bfqq); + +static void bfq_bfqq_expire(struct bfq_data *bfqd, + struct bfq_queue *bfqq, + bool compensate, + enum bfqq_expiration reason); + +/** + * bfq_bfqq_move - migrate @bfqq to @bfqg. + * @bfqd: queue descriptor. + * @bfqq: the queue to move. + * @bfqg: the group to move to. + * + * Move @bfqq to @bfqg, deactivating it from its old group and reactivating + * it on the new one. Avoid putting the entity on the old group idle tree. + * +#ifdef BFQ_MQ + * Must be called under the scheduler lock, to make sure that the blkg + * owning @bfqg does not disappear (see comments in + * bfq_bic_update_cgroup on guaranteeing the consistency of blkg + * objects). +#else + * Must be called under the queue lock; the cgroup owning @bfqg must + * not disappear (by now this just means that we are called under + * rcu_read_lock()). +#endif + */ +static void bfq_bfqq_move(struct bfq_data *bfqd, struct bfq_queue *bfqq, + struct bfq_group *bfqg) +{ + struct bfq_entity *entity = &bfqq->entity; + + BUG_ON(!bfq_bfqq_busy(bfqq) && !RB_EMPTY_ROOT(&bfqq->sort_list)); + BUG_ON(!RB_EMPTY_ROOT(&bfqq->sort_list) && !entity->on_st); + BUG_ON(bfq_bfqq_busy(bfqq) && RB_EMPTY_ROOT(&bfqq->sort_list) + && entity->on_st && + bfqq != bfqd->in_service_queue); + BUG_ON(!bfq_bfqq_busy(bfqq) && bfqq == bfqd->in_service_queue); + + /* If bfqq is empty, then bfq_bfqq_expire also invokes + * bfq_del_bfqq_busy, thereby removing bfqq and its entity + * from data structures related to current group. Otherwise we + * need to remove bfqq explicitly with bfq_deactivate_bfqq, as + * we do below. + */ + if (bfqq == bfqd->in_service_queue) + bfq_bfqq_expire(bfqd, bfqd->in_service_queue, + false, BFQ_BFQQ_PREEMPTED); + + BUG_ON(entity->on_st && !bfq_bfqq_busy(bfqq) + && &bfq_entity_service_tree(entity)->idle != + entity->tree); + + BUG_ON(RB_EMPTY_ROOT(&bfqq->sort_list) && bfq_bfqq_busy(bfqq)); + + if (bfq_bfqq_busy(bfqq)) + bfq_deactivate_bfqq(bfqd, bfqq, false, false); + else if (entity->on_st) { + BUG_ON(&bfq_entity_service_tree(entity)->idle != + entity->tree); + bfq_put_idle_entity(bfq_entity_service_tree(entity), entity); + } +#ifdef BFQ_MQ + bfqg_and_blkg_put(bfqq_group(bfqq)); +#else + bfqg_put(bfqq_group(bfqq)); +#endif + + entity->parent = bfqg->my_entity; + entity->sched_data = &bfqg->sched_data; +#ifdef BFQ_MQ + /* pin down bfqg and its associated blkg */ + bfqg_and_blkg_get(bfqg); +#else + bfqg_get(bfqg); +#endif + + BUG_ON(RB_EMPTY_ROOT(&bfqq->sort_list) && bfq_bfqq_busy(bfqq)); + if (bfq_bfqq_busy(bfqq)) { + bfq_pos_tree_add_move(bfqd, bfqq); + bfq_activate_bfqq(bfqd, bfqq); + } + + if (!bfqd->in_service_queue && !bfqd->rq_in_driver) + bfq_schedule_dispatch(bfqd); + BUG_ON(entity->on_st && !bfq_bfqq_busy(bfqq) + && &bfq_entity_service_tree(entity)->idle != + entity->tree); +} + +/** + * __bfq_bic_change_cgroup - move @bic to @cgroup. + * @bfqd: the queue descriptor. + * @bic: the bic to move. + * @blkcg: the blk-cgroup to move to. + * +#ifdef BFQ_MQ + * Move bic to blkcg, assuming that bfqd->lock is held; which makes + * sure that the reference to cgroup is valid across the call (see + * comments in bfq_bic_update_cgroup on this issue) +#else + * Move bic to blkcg, assuming that bfqd->queue is locked; the caller + * has to make sure that the reference to cgroup is valid across the call. +#endif + * + * NOTE: an alternative approach might have been to store the current + * cgroup in bfqq and getting a reference to it, reducing the lookup + * time here, at the price of slightly more complex code. + */ +static struct bfq_group *__bfq_bic_change_cgroup(struct bfq_data *bfqd, + struct bfq_io_cq *bic, + struct blkcg *blkcg) +{ + struct bfq_queue *async_bfqq = bic_to_bfqq(bic, 0); + struct bfq_queue *sync_bfqq = bic_to_bfqq(bic, 1); + struct bfq_group *bfqg; + struct bfq_entity *entity; + + bfqg = bfq_find_set_group(bfqd, blkcg); + + if (unlikely(!bfqg)) + bfqg = bfqd->root_group; + + if (async_bfqq) { + entity = &async_bfqq->entity; + + if (entity->sched_data != &bfqg->sched_data) { + bic_set_bfqq(bic, NULL, 0); + bfq_log_bfqq(bfqd, async_bfqq, + "bic_change_group: %p %d", + async_bfqq, + async_bfqq->ref); + bfq_put_queue(async_bfqq); + } + } + + if (sync_bfqq) { + entity = &sync_bfqq->entity; + if (entity->sched_data != &bfqg->sched_data) + bfq_bfqq_move(bfqd, sync_bfqq, bfqg); + } + + return bfqg; +} + +static void bfq_bic_update_cgroup(struct bfq_io_cq *bic, struct bio *bio) +{ + struct bfq_data *bfqd = bic_to_bfqd(bic); + struct bfq_group *bfqg = NULL; + uint64_t serial_nr; + + rcu_read_lock(); + serial_nr = bio_blkcg(bio)->css.serial_nr; + + /* + * Check whether blkcg has changed. The condition may trigger + * spuriously on a newly created cic but there's no harm. + */ + if (unlikely(!bfqd) || likely(bic->blkcg_serial_nr == serial_nr)) + goto out; + + bfqg = __bfq_bic_change_cgroup(bfqd, bic, bio_blkcg(bio)); +#ifdef BFQ_MQ + /* + * Update blkg_path for bfq_log_* functions. We cache this + * path, and update it here, for the following + * reasons. Operations on blkg objects in blk-cgroup are + * protected with the request_queue lock, and not with the + * lock that protects the instances of this scheduler + * (bfqd->lock). This exposes BFQ to the following sort of + * race. + * + * The blkg_lookup performed in bfq_get_queue, protected + * through rcu, may happen to return the address of a copy of + * the original blkg. If this is the case, then the + * bfqg_and_blkg_get performed in bfq_get_queue, to pin down + * the blkg, is useless: it does not prevent blk-cgroup code + * from destroying both the original blkg and all objects + * directly or indirectly referred by the copy of the + * blkg. + * + * On the bright side, destroy operations on a blkg invoke, as + * a first step, hooks of the scheduler associated with the + * blkg. And these hooks are executed with bfqd->lock held for + * BFQ. As a consequence, for any blkg associated with the + * request queue this instance of the scheduler is attached + * to, we are guaranteed that such a blkg is not destroyed, and + * that all the pointers it contains are consistent, while we + * are holding bfqd->lock. A blkg_lookup performed with + * bfqd->lock held then returns a fully consistent blkg, which + * remains consistent until this lock is held. + * + * Thanks to the last fact, and to the fact that: (1) bfqg has + * been obtained through a blkg_lookup in the above + * assignment, and (2) bfqd->lock is being held, here we can + * safely use the policy data for the involved blkg (i.e., the + * field bfqg->pd) to get to the blkg associated with bfqg, + * and then we can safely use any field of blkg. After we + * release bfqd->lock, even just getting blkg through this + * bfqg may cause dangling references to be traversed, as + * bfqg->pd may not exist any more. + * + * In view of the above facts, here we cache, in the bfqg, any + * blkg data we may need for this bic, and for its associated + * bfq_queue. As of now, we need to cache only the path of the + * blkg, which is used in the bfq_log_* functions. + * + * Finally, note that bfqg itself needs to be protected from + * destruction on the blkg_free of the original blkg (which + * invokes bfq_pd_free). We use an additional private + * refcounter for bfqg, to let it disappear only after no + * bfq_queue refers to it any longer. + */ + blkg_path(bfqg_to_blkg(bfqg), bfqg->blkg_path, sizeof(bfqg->blkg_path)); +#endif + bic->blkcg_serial_nr = serial_nr; +out: + rcu_read_unlock(); +} + +/** + * bfq_flush_idle_tree - deactivate any entity on the idle tree of @st. + * @st: the service tree being flushed. + */ +static void bfq_flush_idle_tree(struct bfq_service_tree *st) +{ + struct bfq_entity *entity = st->first_idle; + + for (; entity ; entity = st->first_idle) + __bfq_deactivate_entity(entity, false); +} + +/** + * bfq_reparent_leaf_entity - move leaf entity to the root_group. + * @bfqd: the device data structure with the root group. + * @entity: the entity to move. + */ +static void bfq_reparent_leaf_entity(struct bfq_data *bfqd, + struct bfq_entity *entity) +{ + struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); + + BUG_ON(!bfqq); + bfq_bfqq_move(bfqd, bfqq, bfqd->root_group); +} + +/** + * bfq_reparent_active_entities - move to the root group all active + * entities. + * @bfqd: the device data structure with the root group. + * @bfqg: the group to move from. + * @st: the service tree with the entities. + */ +static void bfq_reparent_active_entities(struct bfq_data *bfqd, + struct bfq_group *bfqg, + struct bfq_service_tree *st) +{ + struct rb_root *active = &st->active; + struct bfq_entity *entity = NULL; + + if (!RB_EMPTY_ROOT(&st->active)) + entity = bfq_entity_of(rb_first(active)); + + for (; entity ; entity = bfq_entity_of(rb_first(active))) + bfq_reparent_leaf_entity(bfqd, entity); + + if (bfqg->sched_data.in_service_entity) + bfq_reparent_leaf_entity(bfqd, + bfqg->sched_data.in_service_entity); +} + +/** + * bfq_pd_offline - deactivate the entity associated with @pd, + * and reparent its children entities. + * @pd: descriptor of the policy going offline. + * + * blkio already grabs the queue_lock for us, so no need to use + * RCU-based magic + */ +static void bfq_pd_offline(struct blkg_policy_data *pd) +{ + struct bfq_service_tree *st; + struct bfq_group *bfqg; + struct bfq_data *bfqd; + struct bfq_entity *entity; +#ifdef BFQ_MQ + unsigned long flags; +#endif + int i; + + BUG_ON(!pd); + bfqg = pd_to_bfqg(pd); + BUG_ON(!bfqg); + bfqd = bfqg->bfqd; + BUG_ON(bfqd && !bfqd->root_group); + + entity = bfqg->my_entity; + + if (!entity) /* root group */ + return; + +#ifdef BFQ_MQ + spin_lock_irqsave(&bfqd->lock, flags); +#endif + + /* + * Empty all service_trees belonging to this group before + * deactivating the group itself. + */ + for (i = 0; i < BFQ_IOPRIO_CLASSES; i++) { + BUG_ON(!bfqg->sched_data.service_tree); + st = bfqg->sched_data.service_tree + i; + /* + * The idle tree may still contain bfq_queues belonging + * to exited task because they never migrated to a different + * cgroup from the one being destroyed now. + */ + bfq_flush_idle_tree(st); + + /* + * It may happen that some queues are still active + * (busy) upon group destruction (if the corresponding + * processes have been forced to terminate). We move + * all the leaf entities corresponding to these queues + * to the root_group. + * Also, it may happen that the group has an entity + * in service, which is disconnected from the active + * tree: it must be moved, too. + * There is no need to put the sync queues, as the + * scheduler has taken no reference. + */ + bfq_reparent_active_entities(bfqd, bfqg, st); + BUG_ON(!RB_EMPTY_ROOT(&st->active)); + BUG_ON(!RB_EMPTY_ROOT(&st->idle)); + } + BUG_ON(bfqg->sched_data.next_in_service); + BUG_ON(bfqg->sched_data.in_service_entity); + + __bfq_deactivate_entity(entity, false); + bfq_put_async_queues(bfqd, bfqg); + +#ifdef BFQ_MQ + spin_unlock_irqrestore(&bfqd->lock, flags); +#endif + /* + * @blkg is going offline and will be ignored by + * blkg_[rw]stat_recursive_sum(). Transfer stats to the parent so + * that they don't get lost. If IOs complete after this point, the + * stats for them will be lost. Oh well... + */ + bfqg_stats_xfer_dead(bfqg); +} + +static void bfq_end_wr_async(struct bfq_data *bfqd) +{ + struct blkcg_gq *blkg; + + list_for_each_entry(blkg, &bfqd->queue->blkg_list, q_node) { + struct bfq_group *bfqg = blkg_to_bfqg(blkg); + BUG_ON(!bfqg); + + bfq_end_wr_async_queues(bfqd, bfqg); + } + bfq_end_wr_async_queues(bfqd, bfqd->root_group); +} + +static int bfq_io_show_weight(struct seq_file *sf, void *v) +{ + struct blkcg *blkcg = css_to_blkcg(seq_css(sf)); + struct bfq_group_data *bfqgd = blkcg_to_bfqgd(blkcg); + unsigned int val = 0; + + if (bfqgd) + val = bfqgd->weight; + + seq_printf(sf, "%u\n", val); + + return 0; +} + +static int bfq_io_set_weight_legacy(struct cgroup_subsys_state *css, + struct cftype *cftype, + u64 val) +{ + struct blkcg *blkcg = css_to_blkcg(css); + struct bfq_group_data *bfqgd = blkcg_to_bfqgd(blkcg); + struct blkcg_gq *blkg; + int ret = -ERANGE; + + if (val < BFQ_MIN_WEIGHT || val > BFQ_MAX_WEIGHT) + return ret; + + ret = 0; + spin_lock_irq(&blkcg->lock); + bfqgd->weight = (unsigned short)val; + hlist_for_each_entry(blkg, &blkcg->blkg_list, blkcg_node) { + struct bfq_group *bfqg = blkg_to_bfqg(blkg); + + if (!bfqg) + continue; + /* + * Setting the prio_changed flag of the entity + * to 1 with new_weight == weight would re-set + * the value of the weight to its ioprio mapping. + * Set the flag only if necessary. + */ + if ((unsigned short)val != bfqg->entity.new_weight) { + bfqg->entity.new_weight = (unsigned short)val; + /* + * Make sure that the above new value has been + * stored in bfqg->entity.new_weight before + * setting the prio_changed flag. In fact, + * this flag may be read asynchronously (in + * critical sections protected by a different + * lock than that held here), and finding this + * flag set may cause the execution of the code + * for updating parameters whose value may + * depend also on bfqg->entity.new_weight (in + * __bfq_entity_update_weight_prio). + * This barrier makes sure that the new value + * of bfqg->entity.new_weight is correctly + * seen in that code. + */ + smp_wmb(); + bfqg->entity.prio_changed = 1; + } + } + spin_unlock_irq(&blkcg->lock); + + return ret; +} + +static ssize_t bfq_io_set_weight(struct kernfs_open_file *of, + char *buf, size_t nbytes, + loff_t off) +{ + u64 weight; + /* First unsigned long found in the file is used */ + int ret = kstrtoull(strim(buf), 0, &weight); + + if (ret) + return ret; + + return bfq_io_set_weight_legacy(of_css(of), NULL, weight); +} + +static int bfqg_print_stat(struct seq_file *sf, void *v) +{ + blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), blkg_prfill_stat, + &blkcg_policy_bfq, seq_cft(sf)->private, false); + return 0; +} + +static int bfqg_print_rwstat(struct seq_file *sf, void *v) +{ + blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), blkg_prfill_rwstat, + &blkcg_policy_bfq, seq_cft(sf)->private, true); + return 0; +} + +static u64 bfqg_prfill_stat_recursive(struct seq_file *sf, + struct blkg_policy_data *pd, int off) +{ + u64 sum = blkg_stat_recursive_sum(pd_to_blkg(pd), + &blkcg_policy_bfq, off); + return __blkg_prfill_u64(sf, pd, sum); +} + +static u64 bfqg_prfill_rwstat_recursive(struct seq_file *sf, + struct blkg_policy_data *pd, int off) +{ + struct blkg_rwstat sum = blkg_rwstat_recursive_sum(pd_to_blkg(pd), + &blkcg_policy_bfq, + off); + return __blkg_prfill_rwstat(sf, pd, &sum); +} + +static int bfqg_print_stat_recursive(struct seq_file *sf, void *v) +{ + blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), + bfqg_prfill_stat_recursive, &blkcg_policy_bfq, + seq_cft(sf)->private, false); + return 0; +} + +static int bfqg_print_rwstat_recursive(struct seq_file *sf, void *v) +{ + blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), + bfqg_prfill_rwstat_recursive, &blkcg_policy_bfq, + seq_cft(sf)->private, true); + return 0; +} + +static u64 bfqg_prfill_sectors(struct seq_file *sf, struct blkg_policy_data *pd, + int off) +{ + u64 sum = blkg_rwstat_total(&pd->blkg->stat_bytes); + + return __blkg_prfill_u64(sf, pd, sum >> 9); +} + +static int bfqg_print_stat_sectors(struct seq_file *sf, void *v) +{ + blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), + bfqg_prfill_sectors, &blkcg_policy_bfq, 0, false); + return 0; +} + +static u64 bfqg_prfill_sectors_recursive(struct seq_file *sf, + struct blkg_policy_data *pd, int off) +{ + struct blkg_rwstat tmp = blkg_rwstat_recursive_sum(pd->blkg, NULL, + offsetof(struct blkcg_gq, stat_bytes)); + u64 sum = atomic64_read(&tmp.aux_cnt[BLKG_RWSTAT_READ]) + + atomic64_read(&tmp.aux_cnt[BLKG_RWSTAT_WRITE]); + + return __blkg_prfill_u64(sf, pd, sum >> 9); +} + +static int bfqg_print_stat_sectors_recursive(struct seq_file *sf, void *v) +{ + blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), + bfqg_prfill_sectors_recursive, &blkcg_policy_bfq, 0, + false); + return 0; +} + + +static u64 bfqg_prfill_avg_queue_size(struct seq_file *sf, + struct blkg_policy_data *pd, int off) +{ + struct bfq_group *bfqg = pd_to_bfqg(pd); + u64 samples = blkg_stat_read(&bfqg->stats.avg_queue_size_samples); + u64 v = 0; + + if (samples) { + v = blkg_stat_read(&bfqg->stats.avg_queue_size_sum); + v = div64_u64(v, samples); + } + __blkg_prfill_u64(sf, pd, v); + return 0; +} + +/* print avg_queue_size */ +static int bfqg_print_avg_queue_size(struct seq_file *sf, void *v) +{ + blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), + bfqg_prfill_avg_queue_size, &blkcg_policy_bfq, + 0, false); + return 0; +} + +static struct bfq_group * +bfq_create_group_hierarchy(struct bfq_data *bfqd, int node) +{ + int ret; + + ret = blkcg_activate_policy(bfqd->queue, &blkcg_policy_bfq); + if (ret) + return NULL; + + return blkg_to_bfqg(bfqd->queue->root_blkg); +} + +#ifdef BFQ_MQ +#define BFQ_CGROUP_FNAME(param) "bfq-mq."#param +#else +#define BFQ_CGROUP_FNAME(param) "bfq-sq."#param +#endif + +static struct cftype bfq_blkcg_legacy_files[] = { + { + .name = BFQ_CGROUP_FNAME(weight), + .flags = CFTYPE_NOT_ON_ROOT, + .seq_show = bfq_io_show_weight, + .write_u64 = bfq_io_set_weight_legacy, + }, + + /* statistics, covers only the tasks in the bfqg */ + { + .name = BFQ_CGROUP_FNAME(time), + .private = offsetof(struct bfq_group, stats.time), + .seq_show = bfqg_print_stat, + }, + { + .name = BFQ_CGROUP_FNAME(sectors), + .seq_show = bfqg_print_stat_sectors, + }, + { + .name = BFQ_CGROUP_FNAME(io_service_bytes), + .private = (unsigned long)&blkcg_policy_bfq, + .seq_show = blkg_print_stat_bytes, + }, + { + .name = BFQ_CGROUP_FNAME(io_serviced), + .private = (unsigned long)&blkcg_policy_bfq, + .seq_show = blkg_print_stat_ios, + }, + { + .name = BFQ_CGROUP_FNAME(io_service_time), + .private = offsetof(struct bfq_group, stats.service_time), + .seq_show = bfqg_print_rwstat, + }, + { + .name = BFQ_CGROUP_FNAME(io_wait_time), + .private = offsetof(struct bfq_group, stats.wait_time), + .seq_show = bfqg_print_rwstat, + }, + { + .name = BFQ_CGROUP_FNAME(io_merged), + .private = offsetof(struct bfq_group, stats.merged), + .seq_show = bfqg_print_rwstat, + }, + { + .name = BFQ_CGROUP_FNAME(io_queued), + .private = offsetof(struct bfq_group, stats.queued), + .seq_show = bfqg_print_rwstat, + }, + + /* the same statictics which cover the bfqg and its descendants */ + { + .name = BFQ_CGROUP_FNAME(time_recursive), + .private = offsetof(struct bfq_group, stats.time), + .seq_show = bfqg_print_stat_recursive, + }, + { + .name = BFQ_CGROUP_FNAME(sectors_recursive), + .seq_show = bfqg_print_stat_sectors_recursive, + }, + { + .name = BFQ_CGROUP_FNAME(io_service_bytes_recursive), + .private = (unsigned long)&blkcg_policy_bfq, + .seq_show = blkg_print_stat_bytes_recursive, + }, + { + .name = BFQ_CGROUP_FNAME(io_serviced_recursive), + .private = (unsigned long)&blkcg_policy_bfq, + .seq_show = blkg_print_stat_ios_recursive, + }, + { + .name = BFQ_CGROUP_FNAME(io_service_time_recursive), + .private = offsetof(struct bfq_group, stats.service_time), + .seq_show = bfqg_print_rwstat_recursive, + }, + { + .name = BFQ_CGROUP_FNAME(io_wait_time_recursive), + .private = offsetof(struct bfq_group, stats.wait_time), + .seq_show = bfqg_print_rwstat_recursive, + }, + { + .name = BFQ_CGROUP_FNAME(io_merged_recursive), + .private = offsetof(struct bfq_group, stats.merged), + .seq_show = bfqg_print_rwstat_recursive, + }, + { + .name = BFQ_CGROUP_FNAME(io_queued_recursive), + .private = offsetof(struct bfq_group, stats.queued), + .seq_show = bfqg_print_rwstat_recursive, + }, + { + .name = BFQ_CGROUP_FNAME(avg_queue_size), + .seq_show = bfqg_print_avg_queue_size, + }, + { + .name = BFQ_CGROUP_FNAME(group_wait_time), + .private = offsetof(struct bfq_group, stats.group_wait_time), + .seq_show = bfqg_print_stat, + }, + { + .name = BFQ_CGROUP_FNAME(idle_time), + .private = offsetof(struct bfq_group, stats.idle_time), + .seq_show = bfqg_print_stat, + }, + { + .name = BFQ_CGROUP_FNAME(empty_time), + .private = offsetof(struct bfq_group, stats.empty_time), + .seq_show = bfqg_print_stat, + }, + { + .name = BFQ_CGROUP_FNAME(dequeue), + .private = offsetof(struct bfq_group, stats.dequeue), + .seq_show = bfqg_print_stat, + }, + { } /* terminate */ +}; + +static struct cftype bfq_blkg_files[] = { + { + .name = BFQ_CGROUP_FNAME(weight), + .flags = CFTYPE_NOT_ON_ROOT, + .seq_show = bfq_io_show_weight, + .write = bfq_io_set_weight, + }, + {} /* terminate */ +}; + +#undef BFQ_CGROUP_FNAME + +#else /* BFQ_GROUP_IOSCHED_ENABLED */ + +static inline void bfqg_stats_update_io_add(struct bfq_group *bfqg, + struct bfq_queue *bfqq, unsigned int op) { } +static inline void +bfqg_stats_update_io_remove(struct bfq_group *bfqg, unsigned int op) { } +static inline void +bfqg_stats_update_io_merged(struct bfq_group *bfqg, unsigned int op) { } +static inline void bfqg_stats_update_completion(struct bfq_group *bfqg, + uint64_t start_time, uint64_t io_start_time, + unsigned int op) { } +static inline void +bfqg_stats_set_start_group_wait_time(struct bfq_group *bfqg, + struct bfq_group *curr_bfqg) { } +static inline void bfqg_stats_end_empty_time(struct bfqg_stats *stats) { } +static inline void bfqg_stats_update_dequeue(struct bfq_group *bfqg) { } +static inline void bfqg_stats_set_start_empty_time(struct bfq_group *bfqg) { } +static inline void bfqg_stats_update_idle_time(struct bfq_group *bfqg) { } +static inline void bfqg_stats_set_start_idle_time(struct bfq_group *bfqg) { } +static inline void bfqg_stats_update_avg_queue_size(struct bfq_group *bfqg) { } + +static void bfq_bfqq_move(struct bfq_data *bfqd, struct bfq_queue *bfqq, + struct bfq_group *bfqg) {} + +static void bfq_init_entity(struct bfq_entity *entity, + struct bfq_group *bfqg) +{ + struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); + + entity->weight = entity->new_weight; + entity->orig_weight = entity->new_weight; + if (bfqq) { + bfqq->ioprio = bfqq->new_ioprio; + bfqq->ioprio_class = bfqq->new_ioprio_class; + } + entity->sched_data = &bfqg->sched_data; +} + +static void bfq_bic_update_cgroup(struct bfq_io_cq *bic, struct bio *bio) {} + +static void bfq_end_wr_async(struct bfq_data *bfqd) +{ + bfq_end_wr_async_queues(bfqd, bfqd->root_group); +} + +static struct bfq_group *bfq_find_set_group(struct bfq_data *bfqd, + struct blkcg *blkcg) +{ + return bfqd->root_group; +} + +static struct bfq_group *bfqq_group(struct bfq_queue *bfqq) +{ + return bfqq->bfqd->root_group; +} + +static struct bfq_group * +bfq_create_group_hierarchy(struct bfq_data *bfqd, int node) +{ + struct bfq_group *bfqg; + int i; + + bfqg = kmalloc_node(sizeof(*bfqg), GFP_KERNEL | __GFP_ZERO, node); + if (!bfqg) + return NULL; + + for (i = 0; i < BFQ_IOPRIO_CLASSES; i++) + bfqg->sched_data.service_tree[i] = BFQ_SERVICE_TREE_INIT; + + return bfqg; +} +#endif diff --git a/block/bfq-ioc.c b/block/bfq-ioc.c new file mode 100644 index 0000000000000000..fb7bb8f08b75ae47 --- /dev/null +++ b/block/bfq-ioc.c @@ -0,0 +1,36 @@ +/* + * BFQ: I/O context handling. + * + * Based on ideas and code from CFQ: + * Copyright (C) 2003 Jens Axboe + * + * Copyright (C) 2008 Fabio Checconi + * Paolo Valente + * + * Copyright (C) 2010 Paolo Valente + */ + +/** + * icq_to_bic - convert iocontext queue structure to bfq_io_cq. + * @icq: the iocontext queue. + */ +static struct bfq_io_cq *icq_to_bic(struct io_cq *icq) +{ + /* bic->icq is the first member, %NULL will convert to %NULL */ + return container_of(icq, struct bfq_io_cq, icq); +} + +/** + * bfq_bic_lookup - search into @ioc a bic associated to @bfqd. + * @bfqd: the lookup key. + * @ioc: the io_context of the process doing I/O. + * + * Queue lock must be held. + */ +static struct bfq_io_cq *bfq_bic_lookup(struct bfq_data *bfqd, + struct io_context *ioc) +{ + if (ioc) + return icq_to_bic(ioc_lookup_icq(ioc, bfqd->queue)); + return NULL; +} diff --git a/block/bfq-mq-iosched.c b/block/bfq-mq-iosched.c new file mode 100644 index 0000000000000000..8c5dce7716cbe927 --- /dev/null +++ b/block/bfq-mq-iosched.c @@ -0,0 +1,5693 @@ +/* + * Budget Fair Queueing (BFQ) I/O scheduler. + * + * Based on ideas and code from CFQ: + * Copyright (C) 2003 Jens Axboe + * + * Copyright (C) 2008 Fabio Checconi + * Paolo Valente + * + * Copyright (C) 2015 Paolo Valente + * + * Copyright (C) 2017 Paolo Valente + * + * Licensed under the GPL-2 as detailed in the accompanying COPYING.BFQ + * file. + * + * BFQ is a proportional-share I/O scheduler, with some extra + * low-latency capabilities. BFQ also supports full hierarchical + * scheduling through cgroups. Next paragraphs provide an introduction + * on BFQ inner workings. Details on BFQ benefits and usage can be + * found in Documentation/block/bfq-iosched.txt. + * + * BFQ is a proportional-share storage-I/O scheduling algorithm based + * on the slice-by-slice service scheme of CFQ. But BFQ assigns + * budgets, measured in number of sectors, to processes instead of + * time slices. The device is not granted to the in-service process + * for a given time slice, but until it has exhausted its assigned + * budget. This change from the time to the service domain enables BFQ + * to distribute the device throughput among processes as desired, + * without any distortion due to throughput fluctuations, or to device + * internal queueing. BFQ uses an ad hoc internal scheduler, called + * B-WF2Q+, to schedule processes according to their budgets. More + * precisely, BFQ schedules queues associated with processes. Thanks to + * the accurate policy of B-WF2Q+, BFQ can afford to assign high + * budgets to I/O-bound processes issuing sequential requests (to + * boost the throughput), and yet guarantee a low latency to + * interactive and soft real-time applications. + * + * NOTE: if the main or only goal, with a given device, is to achieve + * the maximum-possible throughput at all times, then do switch off + * all low-latency heuristics for that device, by setting low_latency + * to 0. + * + * BFQ is described in [1], where also a reference to the initial, more + * theoretical paper on BFQ can be found. The interested reader can find + * in the latter paper full details on the main algorithm, as well as + * formulas of the guarantees and formal proofs of all the properties. + * With respect to the version of BFQ presented in these papers, this + * implementation adds a few more heuristics, such as the one that + * guarantees a low latency to soft real-time applications, and a + * hierarchical extension based on H-WF2Q+. + * + * B-WF2Q+ is based on WF2Q+, that is described in [2], together with + * H-WF2Q+, while the augmented tree used to implement B-WF2Q+ with O(log N) + * complexity derives from the one introduced with EEVDF in [3]. + * + * [1] P. Valente, A. Avanzini, "Evolution of the BFQ Storage I/O + * Scheduler", Proceedings of the First Workshop on Mobile System + * Technologies (MST-2015), May 2015. + * http://algogroup.unimore.it/people/paolo/disk_sched/mst-2015.pdf + * + * http://algogroup.unimo.it/people/paolo/disk_sched/bf1-v1-suite-results.pdf + * + * [2] Jon C.R. Bennett and H. Zhang, ``Hierarchical Packet Fair Queueing + * Algorithms,'' IEEE/ACM Transactions on Networking, 5(5):675-689, + * Oct 1997. + * + * http://www.cs.cmu.edu/~hzhang/papers/TON-97-Oct.ps.gz + * + * [3] I. Stoica and H. Abdel-Wahab, ``Earliest Eligible Virtual Deadline + * First: A Flexible and Accurate Mechanism for Proportional Share + * Resource Allocation,'' technical report. + * + * http://www.cs.berkeley.edu/~istoica/papers/eevdf-tr-95.pdf + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "blk.h" +#include "blk-mq.h" +#include "blk-mq-tag.h" +#include "blk-mq-sched.h" +#include "bfq-mq.h" + +/* Expiration time of sync (0) and async (1) requests, in ns. */ +static const u64 bfq_fifo_expire[2] = { NSEC_PER_SEC / 4, NSEC_PER_SEC / 8 }; + +/* Maximum backwards seek, in KiB. */ +static const int bfq_back_max = (16 * 1024); + +/* Penalty of a backwards seek, in number of sectors. */ +static const int bfq_back_penalty = 2; + +/* Idling period duration, in ns. */ +static u32 bfq_slice_idle = (NSEC_PER_SEC / 125); + +/* Minimum number of assigned budgets for which stats are safe to compute. */ +static const int bfq_stats_min_budgets = 194; + +/* Default maximum budget values, in sectors and number of requests. */ +static const int bfq_default_max_budget = (16 * 1024); + +/* + * Async to sync throughput distribution is controlled as follows: + * when an async request is served, the entity is charged the number + * of sectors of the request, multiplied by the factor below + */ +static const int bfq_async_charge_factor = 10; + +/* Default timeout values, in jiffies, approximating CFQ defaults. */ +static const int bfq_timeout = (HZ / 8); + +static struct kmem_cache *bfq_pool; + +/* Below this threshold (in ns), we consider thinktime immediate. */ +#define BFQ_MIN_TT (2 * NSEC_PER_MSEC) + +/* hw_tag detection: parallel requests threshold and min samples needed. */ +#define BFQ_HW_QUEUE_THRESHOLD 4 +#define BFQ_HW_QUEUE_SAMPLES 32 + +#define BFQQ_SEEK_THR (sector_t)(8 * 100) +#define BFQQ_SECT_THR_NONROT (sector_t)(2 * 32) +#define BFQQ_CLOSE_THR (sector_t)(8 * 1024) +#define BFQQ_SEEKY(bfqq) (hweight32(bfqq->seek_history) > 32/8) + +/* Min number of samples required to perform peak-rate update */ +#define BFQ_RATE_MIN_SAMPLES 32 +/* Min observation time interval required to perform a peak-rate update (ns) */ +#define BFQ_RATE_MIN_INTERVAL (300*NSEC_PER_MSEC) +/* Target observation time interval for a peak-rate update (ns) */ +#define BFQ_RATE_REF_INTERVAL NSEC_PER_SEC + +/* Shift used for peak rate fixed precision calculations. */ +#define BFQ_RATE_SHIFT 16 + +/* + * By default, BFQ computes the duration of the weight raising for + * interactive applications automatically, using the following formula: + * duration = (R / r) * T, where r is the peak rate of the device, and + * R and T are two reference parameters. + * In particular, R is the peak rate of the reference device (see below), + * and T is a reference time: given the systems that are likely to be + * installed on the reference device according to its speed class, T is + * about the maximum time needed, under BFQ and while reading two files in + * parallel, to load typical large applications on these systems. + * In practice, the slower/faster the device at hand is, the more/less it + * takes to load applications with respect to the reference device. + * Accordingly, the longer/shorter BFQ grants weight raising to interactive + * applications. + * + * BFQ uses four different reference pairs (R, T), depending on: + * . whether the device is rotational or non-rotational; + * . whether the device is slow, such as old or portable HDDs, as well as + * SD cards, or fast, such as newer HDDs and SSDs. + * + * The device's speed class is dynamically (re)detected in + * bfq_update_peak_rate() every time the estimated peak rate is updated. + * + * In the following definitions, R_slow[0]/R_fast[0] and + * T_slow[0]/T_fast[0] are the reference values for a slow/fast + * rotational device, whereas R_slow[1]/R_fast[1] and + * T_slow[1]/T_fast[1] are the reference values for a slow/fast + * non-rotational device. Finally, device_speed_thresh are the + * thresholds used to switch between speed classes. The reference + * rates are not the actual peak rates of the devices used as a + * reference, but slightly lower values. The reason for using these + * slightly lower values is that the peak-rate estimator tends to + * yield slightly lower values than the actual peak rate (it can yield + * the actual peak rate only if there is only one process doing I/O, + * and the process does sequential I/O). + * + * Both the reference peak rates and the thresholds are measured in + * sectors/usec, left-shifted by BFQ_RATE_SHIFT. + */ +static int R_slow[2] = {1000, 10700}; +static int R_fast[2] = {14000, 33000}; +/* + * To improve readability, a conversion function is used to initialize the + * following arrays, which entails that they can be initialized only in a + * function. + */ +static int T_slow[2]; +static int T_fast[2]; +static int device_speed_thresh[2]; + +#define BFQ_SERVICE_TREE_INIT ((struct bfq_service_tree) \ + { RB_ROOT, RB_ROOT, NULL, NULL, 0, 0 }) + +#define RQ_BIC(rq) ((struct bfq_io_cq *) (rq)->elv.priv[0]) +#define RQ_BFQQ(rq) ((rq)->elv.priv[1]) + +/** + * icq_to_bic - convert iocontext queue structure to bfq_io_cq. + * @icq: the iocontext queue. + */ +static struct bfq_io_cq *icq_to_bic(struct io_cq *icq) +{ + /* bic->icq is the first member, %NULL will convert to %NULL */ + return container_of(icq, struct bfq_io_cq, icq); +} + +/** + * bfq_bic_lookup - search into @ioc a bic associated to @bfqd. + * @bfqd: the lookup key. + * @ioc: the io_context of the process doing I/O. + * @q: the request queue. + */ +static struct bfq_io_cq *bfq_bic_lookup(struct bfq_data *bfqd, + struct io_context *ioc, + struct request_queue *q) +{ + if (ioc) { + unsigned long flags; + struct bfq_io_cq *icq; + + spin_lock_irqsave(q->queue_lock, flags); + icq = icq_to_bic(ioc_lookup_icq(ioc, q)); + spin_unlock_irqrestore(q->queue_lock, flags); + + return icq; + } + + return NULL; +} + +/* + * Scheduler run of queue, if there are requests pending and no one in the + * driver that will restart queueing. + */ +static void bfq_schedule_dispatch(struct bfq_data *bfqd) +{ + if (bfqd->queued != 0) { + bfq_log(bfqd, "schedule dispatch"); + blk_mq_run_hw_queues(bfqd->queue, true); + } +} + +#define BFQ_MQ +#include "bfq-sched.c" +#include "bfq-cgroup-included.c" + +#define bfq_class_idle(bfqq) ((bfqq)->ioprio_class == IOPRIO_CLASS_IDLE) +#define bfq_class_rt(bfqq) ((bfqq)->ioprio_class == IOPRIO_CLASS_RT) + +#define bfq_sample_valid(samples) ((samples) > 80) + +/* + * Lifted from AS - choose which of rq1 and rq2 that is best served now. + * We choose the request that is closesr to the head right now. Distance + * behind the head is penalized and only allowed to a certain extent. + */ +static struct request *bfq_choose_req(struct bfq_data *bfqd, + struct request *rq1, + struct request *rq2, + sector_t last) +{ + sector_t s1, s2, d1 = 0, d2 = 0; + unsigned long back_max; +#define BFQ_RQ1_WRAP 0x01 /* request 1 wraps */ +#define BFQ_RQ2_WRAP 0x02 /* request 2 wraps */ + unsigned int wrap = 0; /* bit mask: requests behind the disk head? */ + + if (!rq1 || rq1 == rq2) + return rq2; + if (!rq2) + return rq1; + + if (rq_is_sync(rq1) && !rq_is_sync(rq2)) + return rq1; + else if (rq_is_sync(rq2) && !rq_is_sync(rq1)) + return rq2; + if ((rq1->cmd_flags & REQ_META) && !(rq2->cmd_flags & REQ_META)) + return rq1; + else if ((rq2->cmd_flags & REQ_META) && !(rq1->cmd_flags & REQ_META)) + return rq2; + + s1 = blk_rq_pos(rq1); + s2 = blk_rq_pos(rq2); + + /* + * By definition, 1KiB is 2 sectors. + */ + back_max = bfqd->bfq_back_max * 2; + + /* + * Strict one way elevator _except_ in the case where we allow + * short backward seeks which are biased as twice the cost of a + * similar forward seek. + */ + if (s1 >= last) + d1 = s1 - last; + else if (s1 + back_max >= last) + d1 = (last - s1) * bfqd->bfq_back_penalty; + else + wrap |= BFQ_RQ1_WRAP; + + if (s2 >= last) + d2 = s2 - last; + else if (s2 + back_max >= last) + d2 = (last - s2) * bfqd->bfq_back_penalty; + else + wrap |= BFQ_RQ2_WRAP; + + /* Found required data */ + + /* + * By doing switch() on the bit mask "wrap" we avoid having to + * check two variables for all permutations: --> faster! + */ + switch (wrap) { + case 0: /* common case for CFQ: rq1 and rq2 not wrapped */ + if (d1 < d2) + return rq1; + else if (d2 < d1) + return rq2; + + if (s1 >= s2) + return rq1; + else + return rq2; + + case BFQ_RQ2_WRAP: + return rq1; + case BFQ_RQ1_WRAP: + return rq2; + case (BFQ_RQ1_WRAP|BFQ_RQ2_WRAP): /* both rqs wrapped */ + default: + /* + * Since both rqs are wrapped, + * start with the one that's further behind head + * (--> only *one* back seek required), + * since back seek takes more time than forward. + */ + if (s1 <= s2) + return rq1; + else + return rq2; + } +} + +static struct bfq_queue * +bfq_rq_pos_tree_lookup(struct bfq_data *bfqd, struct rb_root *root, + sector_t sector, struct rb_node **ret_parent, + struct rb_node ***rb_link) +{ + struct rb_node **p, *parent; + struct bfq_queue *bfqq = NULL; + + parent = NULL; + p = &root->rb_node; + while (*p) { + struct rb_node **n; + + parent = *p; + bfqq = rb_entry(parent, struct bfq_queue, pos_node); + + /* + * Sort strictly based on sector. Smallest to the left, + * largest to the right. + */ + if (sector > blk_rq_pos(bfqq->next_rq)) + n = &(*p)->rb_right; + else if (sector < blk_rq_pos(bfqq->next_rq)) + n = &(*p)->rb_left; + else + break; + p = n; + bfqq = NULL; + } + + *ret_parent = parent; + if (rb_link) + *rb_link = p; + + bfq_log(bfqd, "rq_pos_tree_lookup %llu: returning %d", + (unsigned long long) sector, + bfqq ? bfqq->pid : 0); + + return bfqq; +} + +static void bfq_pos_tree_add_move(struct bfq_data *bfqd, struct bfq_queue *bfqq) +{ + struct rb_node **p, *parent; + struct bfq_queue *__bfqq; + + if (bfqq->pos_root) { + rb_erase(&bfqq->pos_node, bfqq->pos_root); + bfqq->pos_root = NULL; + } + + if (bfq_class_idle(bfqq)) + return; + if (!bfqq->next_rq) + return; + + bfqq->pos_root = &bfq_bfqq_to_bfqg(bfqq)->rq_pos_tree; + __bfqq = bfq_rq_pos_tree_lookup(bfqd, bfqq->pos_root, + blk_rq_pos(bfqq->next_rq), &parent, &p); + if (!__bfqq) { + rb_link_node(&bfqq->pos_node, parent, p); + rb_insert_color(&bfqq->pos_node, bfqq->pos_root); + } else + bfqq->pos_root = NULL; +} + +/* + * Tell whether there are active queues or groups with differentiated weights. + */ +static bool bfq_differentiated_weights(struct bfq_data *bfqd) +{ + /* + * For weights to differ, at least one of the trees must contain + * at least two nodes. + */ + return (!RB_EMPTY_ROOT(&bfqd->queue_weights_tree) && + (bfqd->queue_weights_tree.rb_node->rb_left || + bfqd->queue_weights_tree.rb_node->rb_right) +#ifdef BFQ_GROUP_IOSCHED_ENABLED + ) || + (!RB_EMPTY_ROOT(&bfqd->group_weights_tree) && + (bfqd->group_weights_tree.rb_node->rb_left || + bfqd->group_weights_tree.rb_node->rb_right) +#endif + ); +} + +/* + * The following function returns true if every queue must receive the + * same share of the throughput (this condition is used when deciding + * whether idling may be disabled, see the comments in the function + * bfq_bfqq_may_idle()). + * + * Such a scenario occurs when: + * 1) all active queues have the same weight, + * 2) all active groups at the same level in the groups tree have the same + * weight, + * 3) all active groups at the same level in the groups tree have the same + * number of children. + * + * Unfortunately, keeping the necessary state for evaluating exactly the + * above symmetry conditions would be quite complex and time-consuming. + * Therefore this function evaluates, instead, the following stronger + * sub-conditions, for which it is much easier to maintain the needed + * state: + * 1) all active queues have the same weight, + * 2) all active groups have the same weight, + * 3) all active groups have at most one active child each. + * In particular, the last two conditions are always true if hierarchical + * support and the cgroups interface are not enabled, thus no state needs + * to be maintained in this case. + */ +static bool bfq_symmetric_scenario(struct bfq_data *bfqd) +{ + return !bfq_differentiated_weights(bfqd); +} + +/* + * If the weight-counter tree passed as input contains no counter for + * the weight of the input entity, then add that counter; otherwise just + * increment the existing counter. + * + * Note that weight-counter trees contain few nodes in mostly symmetric + * scenarios. For example, if all queues have the same weight, then the + * weight-counter tree for the queues may contain at most one node. + * This holds even if low_latency is on, because weight-raised queues + * are not inserted in the tree. + * In most scenarios, the rate at which nodes are created/destroyed + * should be low too. + */ +static void bfq_weights_tree_add(struct bfq_data *bfqd, + struct bfq_entity *entity, + struct rb_root *root) +{ + struct rb_node **new = &(root->rb_node), *parent = NULL; + + /* + * Do not insert if the entity is already associated with a + * counter, which happens if: + * 1) the entity is associated with a queue, + * 2) a request arrival has caused the queue to become both + * non-weight-raised, and hence change its weight, and + * backlogged; in this respect, each of the two events + * causes an invocation of this function, + * 3) this is the invocation of this function caused by the + * second event. This second invocation is actually useless, + * and we handle this fact by exiting immediately. More + * efficient or clearer solutions might possibly be adopted. + */ + if (entity->weight_counter) + return; + + while (*new) { + struct bfq_weight_counter *__counter = container_of(*new, + struct bfq_weight_counter, + weights_node); + parent = *new; + + if (entity->weight == __counter->weight) { + entity->weight_counter = __counter; + goto inc_counter; + } + if (entity->weight < __counter->weight) + new = &((*new)->rb_left); + else + new = &((*new)->rb_right); + } + + entity->weight_counter = kzalloc(sizeof(struct bfq_weight_counter), + GFP_ATOMIC); + + /* + * In the unlucky event of an allocation failure, we just + * exit. This will cause the weight of entity to not be + * considered in bfq_differentiated_weights, which, in its + * turn, causes the scenario to be deemed wrongly symmetric in + * case entity's weight would have been the only weight making + * the scenario asymmetric. On the bright side, no unbalance + * will however occur when entity becomes inactive again (the + * invocation of this function is triggered by an activation + * of entity). In fact, bfq_weights_tree_remove does nothing + * if !entity->weight_counter. + */ + if (unlikely(!entity->weight_counter)) + return; + + entity->weight_counter->weight = entity->weight; + rb_link_node(&entity->weight_counter->weights_node, parent, new); + rb_insert_color(&entity->weight_counter->weights_node, root); + +inc_counter: + entity->weight_counter->num_active++; +} + +/* + * Decrement the weight counter associated with the entity, and, if the + * counter reaches 0, remove the counter from the tree. + * See the comments to the function bfq_weights_tree_add() for considerations + * about overhead. + */ +static void bfq_weights_tree_remove(struct bfq_data *bfqd, + struct bfq_entity *entity, + struct rb_root *root) +{ + if (!entity->weight_counter) + return; + + BUG_ON(RB_EMPTY_ROOT(root)); + BUG_ON(entity->weight_counter->weight != entity->weight); + + BUG_ON(!entity->weight_counter->num_active); + entity->weight_counter->num_active--; + if (entity->weight_counter->num_active > 0) + goto reset_entity_pointer; + + rb_erase(&entity->weight_counter->weights_node, root); + kfree(entity->weight_counter); + +reset_entity_pointer: + entity->weight_counter = NULL; +} + +/* + * Return expired entry, or NULL to just start from scratch in rbtree. + */ +static struct request *bfq_check_fifo(struct bfq_queue *bfqq, + struct request *last) +{ + struct request *rq; + + if (bfq_bfqq_fifo_expire(bfqq)) + return NULL; + + bfq_mark_bfqq_fifo_expire(bfqq); + + rq = rq_entry_fifo(bfqq->fifo.next); + + if (rq == last || ktime_get_ns() < rq->fifo_time) + return NULL; + + bfq_log_bfqq(bfqq->bfqd, bfqq, "check_fifo: returned %p", rq); + BUG_ON(RB_EMPTY_NODE(&rq->rb_node)); + return rq; +} + +static struct request *bfq_find_next_rq(struct bfq_data *bfqd, + struct bfq_queue *bfqq, + struct request *last) +{ + struct rb_node *rbnext = rb_next(&last->rb_node); + struct rb_node *rbprev = rb_prev(&last->rb_node); + struct request *next, *prev = NULL; + + BUG_ON(list_empty(&bfqq->fifo)); + + /* Follow expired path, else get first next available. */ + next = bfq_check_fifo(bfqq, last); + if (next) { + BUG_ON(next == last); + return next; + } + + BUG_ON(RB_EMPTY_NODE(&last->rb_node)); + + if (rbprev) + prev = rb_entry_rq(rbprev); + + if (rbnext) + next = rb_entry_rq(rbnext); + else { + rbnext = rb_first(&bfqq->sort_list); + if (rbnext && rbnext != &last->rb_node) + next = rb_entry_rq(rbnext); + } + + return bfq_choose_req(bfqd, next, prev, blk_rq_pos(last)); +} + +/* see the definition of bfq_async_charge_factor for details */ +static unsigned long bfq_serv_to_charge(struct request *rq, + struct bfq_queue *bfqq) +{ + if (bfq_bfqq_sync(bfqq) || bfqq->wr_coeff > 1) + return blk_rq_sectors(rq); + + /* + * If there are no weight-raised queues, then amplify service + * by just the async charge factor; otherwise amplify service + * by twice the async charge factor, to further reduce latency + * for weight-raised queues. + */ + if (bfqq->bfqd->wr_busy_queues == 0) + return blk_rq_sectors(rq) * bfq_async_charge_factor; + + return blk_rq_sectors(rq) * 2 * bfq_async_charge_factor; +} + +/** + * bfq_updated_next_req - update the queue after a new next_rq selection. + * @bfqd: the device data the queue belongs to. + * @bfqq: the queue to update. + * + * If the first request of a queue changes we make sure that the queue + * has enough budget to serve at least its first request (if the + * request has grown). We do this because if the queue has not enough + * budget for its first request, it has to go through two dispatch + * rounds to actually get it dispatched. + */ +static void bfq_updated_next_req(struct bfq_data *bfqd, + struct bfq_queue *bfqq) +{ + struct bfq_entity *entity = &bfqq->entity; + struct bfq_service_tree *st = bfq_entity_service_tree(entity); + struct request *next_rq = bfqq->next_rq; + unsigned long new_budget; + + if (!next_rq) + return; + + if (bfqq == bfqd->in_service_queue) + /* + * In order not to break guarantees, budgets cannot be + * changed after an entity has been selected. + */ + return; + + BUG_ON(entity->tree != &st->active); + BUG_ON(entity == entity->sched_data->in_service_entity); + + new_budget = max_t(unsigned long, bfqq->max_budget, + bfq_serv_to_charge(next_rq, bfqq)); + if (entity->budget != new_budget) { + entity->budget = new_budget; + bfq_log_bfqq(bfqd, bfqq, "updated next rq: new budget %lu", + new_budget); + bfq_requeue_bfqq(bfqd, bfqq, false); + } +} + +static unsigned int bfq_wr_duration(struct bfq_data *bfqd) +{ + u64 dur; + + if (bfqd->bfq_wr_max_time > 0) + return bfqd->bfq_wr_max_time; + + dur = bfqd->RT_prod; + do_div(dur, bfqd->peak_rate); + + /* + * Limit duration between 3 and 13 seconds. Tests show that + * higher values than 13 seconds often yield the opposite of + * the desired result, i.e., worsen responsiveness by letting + * non-interactive and non-soft-real-time applications + * preserve weight raising for a too long time interval. + * + * On the other end, lower values than 3 seconds make it + * difficult for most interactive tasks to complete their jobs + * before weight-raising finishes. + */ + if (dur > msecs_to_jiffies(13000)) + dur = msecs_to_jiffies(13000); + else if (dur < msecs_to_jiffies(3000)) + dur = msecs_to_jiffies(3000); + + return dur; +} + +static void +bfq_bfqq_resume_state(struct bfq_queue *bfqq, struct bfq_data *bfqd, + struct bfq_io_cq *bic, bool bfq_already_existing) +{ + unsigned int old_wr_coeff; + bool busy = bfq_already_existing && bfq_bfqq_busy(bfqq); + + if (bic->saved_has_short_ttime) + bfq_mark_bfqq_has_short_ttime(bfqq); + else + bfq_clear_bfqq_has_short_ttime(bfqq); + + if (bic->saved_IO_bound) + bfq_mark_bfqq_IO_bound(bfqq); + else + bfq_clear_bfqq_IO_bound(bfqq); + + if (unlikely(busy)) + old_wr_coeff = bfqq->wr_coeff; + + bfqq->ttime = bic->saved_ttime; + bfqq->wr_coeff = bic->saved_wr_coeff; + bfqq->wr_start_at_switch_to_srt = bic->saved_wr_start_at_switch_to_srt; + BUG_ON(time_is_after_jiffies(bfqq->wr_start_at_switch_to_srt)); + bfqq->last_wr_start_finish = bic->saved_last_wr_start_finish; + bfqq->wr_cur_max_time = bic->saved_wr_cur_max_time; + BUG_ON(time_is_after_jiffies(bfqq->last_wr_start_finish)); + + if (bfqq->wr_coeff > 1 && (bfq_bfqq_in_large_burst(bfqq) || + time_is_before_jiffies(bfqq->last_wr_start_finish + + bfqq->wr_cur_max_time))) { + bfq_log_bfqq(bfqq->bfqd, bfqq, + "resume state: switching off wr (%lu + %lu < %lu)", + bfqq->last_wr_start_finish, bfqq->wr_cur_max_time, + jiffies); + + bfqq->wr_coeff = 1; + } + + /* make sure weight will be updated, however we got here */ + bfqq->entity.prio_changed = 1; + + if (likely(!busy)) + return; + + if (old_wr_coeff == 1 && bfqq->wr_coeff > 1) { + bfqd->wr_busy_queues++; + BUG_ON(bfqd->wr_busy_queues > bfqd->busy_queues); + } else if (old_wr_coeff > 1 && bfqq->wr_coeff == 1) { + bfqd->wr_busy_queues--; + BUG_ON(bfqd->wr_busy_queues < 0); + } +} + +static int bfqq_process_refs(struct bfq_queue *bfqq) +{ + int process_refs, io_refs; + + lockdep_assert_held(&bfqq->bfqd->lock); + + io_refs = bfqq->allocated; + process_refs = bfqq->ref - io_refs - bfqq->entity.on_st; + BUG_ON(process_refs < 0); + return process_refs; +} + +/* Empty burst list and add just bfqq (see comments to bfq_handle_burst) */ +static void bfq_reset_burst_list(struct bfq_data *bfqd, struct bfq_queue *bfqq) +{ + struct bfq_queue *item; + struct hlist_node *n; + + hlist_for_each_entry_safe(item, n, &bfqd->burst_list, burst_list_node) + hlist_del_init(&item->burst_list_node); + hlist_add_head(&bfqq->burst_list_node, &bfqd->burst_list); + bfqd->burst_size = 1; + bfqd->burst_parent_entity = bfqq->entity.parent; +} + +/* Add bfqq to the list of queues in current burst (see bfq_handle_burst) */ +static void bfq_add_to_burst(struct bfq_data *bfqd, struct bfq_queue *bfqq) +{ + /* Increment burst size to take into account also bfqq */ + bfqd->burst_size++; + + bfq_log_bfqq(bfqd, bfqq, "add_to_burst %d", bfqd->burst_size); + + BUG_ON(bfqd->burst_size > bfqd->bfq_large_burst_thresh); + + if (bfqd->burst_size == bfqd->bfq_large_burst_thresh) { + struct bfq_queue *pos, *bfqq_item; + struct hlist_node *n; + + /* + * Enough queues have been activated shortly after each + * other to consider this burst as large. + */ + bfqd->large_burst = true; + bfq_log_bfqq(bfqd, bfqq, "add_to_burst: large burst started"); + + /* + * We can now mark all queues in the burst list as + * belonging to a large burst. + */ + hlist_for_each_entry(bfqq_item, &bfqd->burst_list, + burst_list_node) { + bfq_mark_bfqq_in_large_burst(bfqq_item); + bfq_log_bfqq(bfqd, bfqq_item, "marked in large burst"); + } + bfq_mark_bfqq_in_large_burst(bfqq); + bfq_log_bfqq(bfqd, bfqq, "marked in large burst"); + + /* + * From now on, and until the current burst finishes, any + * new queue being activated shortly after the last queue + * was inserted in the burst can be immediately marked as + * belonging to a large burst. So the burst list is not + * needed any more. Remove it. + */ + hlist_for_each_entry_safe(pos, n, &bfqd->burst_list, + burst_list_node) + hlist_del_init(&pos->burst_list_node); + } else /* + * Burst not yet large: add bfqq to the burst list. Do + * not increment the ref counter for bfqq, because bfqq + * is removed from the burst list before freeing bfqq + * in put_queue. + */ + hlist_add_head(&bfqq->burst_list_node, &bfqd->burst_list); +} + +/* + * If many queues belonging to the same group happen to be created + * shortly after each other, then the processes associated with these + * queues have typically a common goal. In particular, bursts of queue + * creations are usually caused by services or applications that spawn + * many parallel threads/processes. Examples are systemd during boot, + * or git grep. To help these processes get their job done as soon as + * possible, it is usually better to not grant either weight-raising + * or device idling to their queues. + * + * In this comment we describe, firstly, the reasons why this fact + * holds, and, secondly, the next function, which implements the main + * steps needed to properly mark these queues so that they can then be + * treated in a different way. + * + * The above services or applications benefit mostly from a high + * throughput: the quicker the requests of the activated queues are + * cumulatively served, the sooner the target job of these queues gets + * completed. As a consequence, weight-raising any of these queues, + * which also implies idling the device for it, is almost always + * counterproductive. In most cases it just lowers throughput. + * + * On the other hand, a burst of queue creations may be caused also by + * the start of an application that does not consist of a lot of + * parallel I/O-bound threads. In fact, with a complex application, + * several short processes may need to be executed to start-up the + * application. In this respect, to start an application as quickly as + * possible, the best thing to do is in any case to privilege the I/O + * related to the application with respect to all other + * I/O. Therefore, the best strategy to start as quickly as possible + * an application that causes a burst of queue creations is to + * weight-raise all the queues created during the burst. This is the + * exact opposite of the best strategy for the other type of bursts. + * + * In the end, to take the best action for each of the two cases, the + * two types of bursts need to be distinguished. Fortunately, this + * seems relatively easy, by looking at the sizes of the bursts. In + * particular, we found a threshold such that only bursts with a + * larger size than that threshold are apparently caused by + * services or commands such as systemd or git grep. For brevity, + * hereafter we call just 'large' these bursts. BFQ *does not* + * weight-raise queues whose creation occurs in a large burst. In + * addition, for each of these queues BFQ performs or does not perform + * idling depending on which choice boosts the throughput more. The + * exact choice depends on the device and request pattern at + * hand. + * + * Unfortunately, false positives may occur while an interactive task + * is starting (e.g., an application is being started). The + * consequence is that the queues associated with the task do not + * enjoy weight raising as expected. Fortunately these false positives + * are very rare. They typically occur if some service happens to + * start doing I/O exactly when the interactive task starts. + * + * Turning back to the next function, it implements all the steps + * needed to detect the occurrence of a large burst and to properly + * mark all the queues belonging to it (so that they can then be + * treated in a different way). This goal is achieved by maintaining a + * "burst list" that holds, temporarily, the queues that belong to the + * burst in progress. The list is then used to mark these queues as + * belonging to a large burst if the burst does become large. The main + * steps are the following. + * + * . when the very first queue is created, the queue is inserted into the + * list (as it could be the first queue in a possible burst) + * + * . if the current burst has not yet become large, and a queue Q that does + * not yet belong to the burst is activated shortly after the last time + * at which a new queue entered the burst list, then the function appends + * Q to the burst list + * + * . if, as a consequence of the previous step, the burst size reaches + * the large-burst threshold, then + * + * . all the queues in the burst list are marked as belonging to a + * large burst + * + * . the burst list is deleted; in fact, the burst list already served + * its purpose (keeping temporarily track of the queues in a burst, + * so as to be able to mark them as belonging to a large burst in the + * previous sub-step), and now is not needed any more + * + * . the device enters a large-burst mode + * + * . if a queue Q that does not belong to the burst is created while + * the device is in large-burst mode and shortly after the last time + * at which a queue either entered the burst list or was marked as + * belonging to the current large burst, then Q is immediately marked + * as belonging to a large burst. + * + * . if a queue Q that does not belong to the burst is created a while + * later, i.e., not shortly after, than the last time at which a queue + * either entered the burst list or was marked as belonging to the + * current large burst, then the current burst is deemed as finished and: + * + * . the large-burst mode is reset if set + * + * . the burst list is emptied + * + * . Q is inserted in the burst list, as Q may be the first queue + * in a possible new burst (then the burst list contains just Q + * after this step). + */ +static void bfq_handle_burst(struct bfq_data *bfqd, struct bfq_queue *bfqq) +{ + /* + * If bfqq is already in the burst list or is part of a large + * burst, or finally has just been split, then there is + * nothing else to do. + */ + if (!hlist_unhashed(&bfqq->burst_list_node) || + bfq_bfqq_in_large_burst(bfqq) || + time_is_after_eq_jiffies(bfqq->split_time + + msecs_to_jiffies(10))) + return; + + /* + * If bfqq's creation happens late enough, or bfqq belongs to + * a different group than the burst group, then the current + * burst is finished, and related data structures must be + * reset. + * + * In this respect, consider the special case where bfqq is + * the very first queue created after BFQ is selected for this + * device. In this case, last_ins_in_burst and + * burst_parent_entity are not yet significant when we get + * here. But it is easy to verify that, whether or not the + * following condition is true, bfqq will end up being + * inserted into the burst list. In particular the list will + * happen to contain only bfqq. And this is exactly what has + * to happen, as bfqq may be the first queue of the first + * burst. + */ + if (time_is_before_jiffies(bfqd->last_ins_in_burst + + bfqd->bfq_burst_interval) || + bfqq->entity.parent != bfqd->burst_parent_entity) { + bfqd->large_burst = false; + bfq_reset_burst_list(bfqd, bfqq); + bfq_log_bfqq(bfqd, bfqq, + "handle_burst: late activation or different group"); + goto end; + } + + /* + * If we get here, then bfqq is being activated shortly after the + * last queue. So, if the current burst is also large, we can mark + * bfqq as belonging to this large burst immediately. + */ + if (bfqd->large_burst) { + bfq_log_bfqq(bfqd, bfqq, "handle_burst: marked in burst"); + bfq_mark_bfqq_in_large_burst(bfqq); + goto end; + } + + /* + * If we get here, then a large-burst state has not yet been + * reached, but bfqq is being activated shortly after the last + * queue. Then we add bfqq to the burst. + */ + bfq_add_to_burst(bfqd, bfqq); +end: + /* + * At this point, bfqq either has been added to the current + * burst or has caused the current burst to terminate and a + * possible new burst to start. In particular, in the second + * case, bfqq has become the first queue in the possible new + * burst. In both cases last_ins_in_burst needs to be moved + * forward. + */ + bfqd->last_ins_in_burst = jiffies; + +} + +static int bfq_bfqq_budget_left(struct bfq_queue *bfqq) +{ + struct bfq_entity *entity = &bfqq->entity; + + return entity->budget - entity->service; +} + +/* + * If enough samples have been computed, return the current max budget + * stored in bfqd, which is dynamically updated according to the + * estimated disk peak rate; otherwise return the default max budget + */ +static int bfq_max_budget(struct bfq_data *bfqd) +{ + if (bfqd->budgets_assigned < bfq_stats_min_budgets) + return bfq_default_max_budget; + else + return bfqd->bfq_max_budget; +} + +/* + * Return min budget, which is a fraction of the current or default + * max budget (trying with 1/32) + */ +static int bfq_min_budget(struct bfq_data *bfqd) +{ + if (bfqd->budgets_assigned < bfq_stats_min_budgets) + return bfq_default_max_budget / 32; + else + return bfqd->bfq_max_budget / 32; +} + +static void bfq_bfqq_expire(struct bfq_data *bfqd, + struct bfq_queue *bfqq, + bool compensate, + enum bfqq_expiration reason); + +/* + * The next function, invoked after the input queue bfqq switches from + * idle to busy, updates the budget of bfqq. The function also tells + * whether the in-service queue should be expired, by returning + * true. The purpose of expiring the in-service queue is to give bfqq + * the chance to possibly preempt the in-service queue, and the reason + * for preempting the in-service queue is to achieve one of the two + * goals below. + * + * 1. Guarantee to bfqq its reserved bandwidth even if bfqq has + * expired because it has remained idle. In particular, bfqq may have + * expired for one of the following two reasons: + * + * - BFQ_BFQQ_NO_MORE_REQUEST bfqq did not enjoy any device idling and + * did not make it to issue a new request before its last request + * was served; + * + * - BFQ_BFQQ_TOO_IDLE bfqq did enjoy device idling, but did not issue + * a new request before the expiration of the idling-time. + * + * Even if bfqq has expired for one of the above reasons, the process + * associated with the queue may be however issuing requests greedily, + * and thus be sensitive to the bandwidth it receives (bfqq may have + * remained idle for other reasons: CPU high load, bfqq not enjoying + * idling, I/O throttling somewhere in the path from the process to + * the I/O scheduler, ...). But if, after every expiration for one of + * the above two reasons, bfqq has to wait for the service of at least + * one full budget of another queue before being served again, then + * bfqq is likely to get a much lower bandwidth or resource time than + * its reserved ones. To address this issue, two countermeasures need + * to be taken. + * + * First, the budget and the timestamps of bfqq need to be updated in + * a special way on bfqq reactivation: they need to be updated as if + * bfqq did not remain idle and did not expire. In fact, if they are + * computed as if bfqq expired and remained idle until reactivation, + * then the process associated with bfqq is treated as if, instead of + * being greedy, it stopped issuing requests when bfqq remained idle, + * and restarts issuing requests only on this reactivation. In other + * words, the scheduler does not help the process recover the "service + * hole" between bfqq expiration and reactivation. As a consequence, + * the process receives a lower bandwidth than its reserved one. In + * contrast, to recover this hole, the budget must be updated as if + * bfqq was not expired at all before this reactivation, i.e., it must + * be set to the value of the remaining budget when bfqq was + * expired. Along the same line, timestamps need to be assigned the + * value they had the last time bfqq was selected for service, i.e., + * before last expiration. Thus timestamps need to be back-shifted + * with respect to their normal computation (see [1] for more details + * on this tricky aspect). + * + * Secondly, to allow the process to recover the hole, the in-service + * queue must be expired too, to give bfqq the chance to preempt it + * immediately. In fact, if bfqq has to wait for a full budget of the + * in-service queue to be completed, then it may become impossible to + * let the process recover the hole, even if the back-shifted + * timestamps of bfqq are lower than those of the in-service queue. If + * this happens for most or all of the holes, then the process may not + * receive its reserved bandwidth. In this respect, it is worth noting + * that, being the service of outstanding requests unpreemptible, a + * little fraction of the holes may however be unrecoverable, thereby + * causing a little loss of bandwidth. + * + * The last important point is detecting whether bfqq does need this + * bandwidth recovery. In this respect, the next function deems the + * process associated with bfqq greedy, and thus allows it to recover + * the hole, if: 1) the process is waiting for the arrival of a new + * request (which implies that bfqq expired for one of the above two + * reasons), and 2) such a request has arrived soon. The first + * condition is controlled through the flag non_blocking_wait_rq, + * while the second through the flag arrived_in_time. If both + * conditions hold, then the function computes the budget in the + * above-described special way, and signals that the in-service queue + * should be expired. Timestamp back-shifting is done later in + * __bfq_activate_entity. + * + * 2. Reduce latency. Even if timestamps are not backshifted to let + * the process associated with bfqq recover a service hole, bfqq may + * however happen to have, after being (re)activated, a lower finish + * timestamp than the in-service queue. That is, the next budget of + * bfqq may have to be completed before the one of the in-service + * queue. If this is the case, then preempting the in-service queue + * allows this goal to be achieved, apart from the unpreemptible, + * outstanding requests mentioned above. + * + * Unfortunately, regardless of which of the above two goals one wants + * to achieve, service trees need first to be updated to know whether + * the in-service queue must be preempted. To have service trees + * correctly updated, the in-service queue must be expired and + * rescheduled, and bfqq must be scheduled too. This is one of the + * most costly operations (in future versions, the scheduling + * mechanism may be re-designed in such a way to make it possible to + * know whether preemption is needed without needing to update service + * trees). In addition, queue preemptions almost always cause random + * I/O, and thus loss of throughput. Because of these facts, the next + * function adopts the following simple scheme to avoid both costly + * operations and too frequent preemptions: it requests the expiration + * of the in-service queue (unconditionally) only for queues that need + * to recover a hole, or that either are weight-raised or deserve to + * be weight-raised. + */ +static bool bfq_bfqq_update_budg_for_activation(struct bfq_data *bfqd, + struct bfq_queue *bfqq, + bool arrived_in_time, + bool wr_or_deserves_wr) +{ + struct bfq_entity *entity = &bfqq->entity; + + if (bfq_bfqq_non_blocking_wait_rq(bfqq) && arrived_in_time) { + /* + * We do not clear the flag non_blocking_wait_rq here, as + * the latter is used in bfq_activate_bfqq to signal + * that timestamps need to be back-shifted (and is + * cleared right after). + */ + + /* + * In next assignment we rely on that either + * entity->service or entity->budget are not updated + * on expiration if bfqq is empty (see + * __bfq_bfqq_recalc_budget). Thus both quantities + * remain unchanged after such an expiration, and the + * following statement therefore assigns to + * entity->budget the remaining budget on such an + * expiration. For clarity, entity->service is not + * updated on expiration in any case, and, in normal + * operation, is reset only when bfqq is selected for + * service (see bfq_get_next_queue). + */ + BUG_ON(bfqq->max_budget < 0); + entity->budget = min_t(unsigned long, + bfq_bfqq_budget_left(bfqq), + bfqq->max_budget); + + BUG_ON(entity->budget < 0); + return true; + } + + BUG_ON(bfqq->max_budget < 0); + entity->budget = max_t(unsigned long, bfqq->max_budget, + bfq_serv_to_charge(bfqq->next_rq, bfqq)); + BUG_ON(entity->budget < 0); + + bfq_clear_bfqq_non_blocking_wait_rq(bfqq); + return wr_or_deserves_wr; +} + +/* + * Return the farthest future time instant according to jiffies + * macros. + */ +static unsigned long bfq_greatest_from_now(void) +{ + return jiffies + MAX_JIFFY_OFFSET; +} + +/* + * Return the farthest past time instant according to jiffies + * macros. + */ +static unsigned long bfq_smallest_from_now(void) +{ + return jiffies - MAX_JIFFY_OFFSET; +} + +static void bfq_update_bfqq_wr_on_rq_arrival(struct bfq_data *bfqd, + struct bfq_queue *bfqq, + unsigned int old_wr_coeff, + bool wr_or_deserves_wr, + bool interactive, + bool in_burst, + bool soft_rt) +{ + if (old_wr_coeff == 1 && wr_or_deserves_wr) { + /* start a weight-raising period */ + if (interactive) { + bfqq->wr_coeff = bfqd->bfq_wr_coeff; + bfqq->wr_cur_max_time = bfq_wr_duration(bfqd); + } else { + /* + * No interactive weight raising in progress + * here: assign minus infinity to + * wr_start_at_switch_to_srt, to make sure + * that, at the end of the soft-real-time + * weight raising periods that is starting + * now, no interactive weight-raising period + * may be wrongly considered as still in + * progress (and thus actually started by + * mistake). + */ + bfqq->wr_start_at_switch_to_srt = + bfq_smallest_from_now(); + bfqq->wr_coeff = bfqd->bfq_wr_coeff * + BFQ_SOFTRT_WEIGHT_FACTOR; + bfqq->wr_cur_max_time = + bfqd->bfq_wr_rt_max_time; + } + /* + * If needed, further reduce budget to make sure it is + * close to bfqq's backlog, so as to reduce the + * scheduling-error component due to a too large + * budget. Do not care about throughput consequences, + * but only about latency. Finally, do not assign a + * too small budget either, to avoid increasing + * latency by causing too frequent expirations. + */ + bfqq->entity.budget = min_t(unsigned long, + bfqq->entity.budget, + 2 * bfq_min_budget(bfqd)); + + bfq_log_bfqq(bfqd, bfqq, + "wrais starting at %lu, rais_max_time %u", + jiffies, + jiffies_to_msecs(bfqq->wr_cur_max_time)); + } else if (old_wr_coeff > 1) { + if (interactive) { /* update wr coeff and duration */ + bfqq->wr_coeff = bfqd->bfq_wr_coeff; + bfqq->wr_cur_max_time = bfq_wr_duration(bfqd); + } else if (in_burst) { + bfqq->wr_coeff = 1; + bfq_log_bfqq(bfqd, bfqq, + "wrais ending at %lu, rais_max_time %u", + jiffies, + jiffies_to_msecs(bfqq-> + wr_cur_max_time)); + } else if (soft_rt) { + /* + * The application is now or still meeting the + * requirements for being deemed soft rt. We + * can then correctly and safely (re)charge + * the weight-raising duration for the + * application with the weight-raising + * duration for soft rt applications. + * + * In particular, doing this recharge now, i.e., + * before the weight-raising period for the + * application finishes, reduces the probability + * of the following negative scenario: + * 1) the weight of a soft rt application is + * raised at startup (as for any newly + * created application), + * 2) since the application is not interactive, + * at a certain time weight-raising is + * stopped for the application, + * 3) at that time the application happens to + * still have pending requests, and hence + * is destined to not have a chance to be + * deemed soft rt before these requests are + * completed (see the comments to the + * function bfq_bfqq_softrt_next_start() + * for details on soft rt detection), + * 4) these pending requests experience a high + * latency because the application is not + * weight-raised while they are pending. + */ + if (bfqq->wr_cur_max_time != + bfqd->bfq_wr_rt_max_time) { + bfqq->wr_start_at_switch_to_srt = + bfqq->last_wr_start_finish; + BUG_ON(time_is_after_jiffies(bfqq->last_wr_start_finish)); + + bfqq->wr_cur_max_time = + bfqd->bfq_wr_rt_max_time; + bfqq->wr_coeff = bfqd->bfq_wr_coeff * + BFQ_SOFTRT_WEIGHT_FACTOR; + bfq_log_bfqq(bfqd, bfqq, + "switching to soft_rt wr"); + } else + bfq_log_bfqq(bfqd, bfqq, + "moving forward soft_rt wr duration"); + bfqq->last_wr_start_finish = jiffies; + } + } +} + +static bool bfq_bfqq_idle_for_long_time(struct bfq_data *bfqd, + struct bfq_queue *bfqq) +{ + return bfqq->dispatched == 0 && + time_is_before_jiffies( + bfqq->budget_timeout + + bfqd->bfq_wr_min_idle_time); +} + +static void bfq_bfqq_handle_idle_busy_switch(struct bfq_data *bfqd, + struct bfq_queue *bfqq, + int old_wr_coeff, + struct request *rq, + bool *interactive) +{ + bool soft_rt, in_burst, wr_or_deserves_wr, + bfqq_wants_to_preempt, + idle_for_long_time = bfq_bfqq_idle_for_long_time(bfqd, bfqq), + /* + * See the comments on + * bfq_bfqq_update_budg_for_activation for + * details on the usage of the next variable. + */ + arrived_in_time = ktime_get_ns() <= + bfqq->ttime.last_end_request + + bfqd->bfq_slice_idle * 3; + + bfq_log_bfqq(bfqd, bfqq, + "bfq_add_request non-busy: " + "jiffies %lu, in_time %d, idle_long %d busyw %d " + "wr_coeff %u", + jiffies, arrived_in_time, + idle_for_long_time, + bfq_bfqq_non_blocking_wait_rq(bfqq), + old_wr_coeff); + + BUG_ON(bfqq->entity.budget < bfqq->entity.service); + + BUG_ON(bfqq == bfqd->in_service_queue); + bfqg_stats_update_io_add(bfqq_group(RQ_BFQQ(rq)), bfqq, rq->cmd_flags); + + /* + * bfqq deserves to be weight-raised if: + * - it is sync, + * - it does not belong to a large burst, + * - it has been idle for enough time or is soft real-time, + * - is linked to a bfq_io_cq (it is not shared in any sense) + */ + in_burst = bfq_bfqq_in_large_burst(bfqq); + soft_rt = bfqd->bfq_wr_max_softrt_rate > 0 && + !in_burst && + time_is_before_jiffies(bfqq->soft_rt_next_start); + *interactive = + !in_burst && + idle_for_long_time; + wr_or_deserves_wr = bfqd->low_latency && + (bfqq->wr_coeff > 1 || + (bfq_bfqq_sync(bfqq) && + bfqq->bic && (*interactive || soft_rt))); + + bfq_log_bfqq(bfqd, bfqq, + "bfq_add_request: " + "in_burst %d, " + "soft_rt %d (next %lu), inter %d, bic %p", + bfq_bfqq_in_large_burst(bfqq), soft_rt, + bfqq->soft_rt_next_start, + *interactive, + bfqq->bic); + + /* + * Using the last flag, update budget and check whether bfqq + * may want to preempt the in-service queue. + */ + bfqq_wants_to_preempt = + bfq_bfqq_update_budg_for_activation(bfqd, bfqq, + arrived_in_time, + wr_or_deserves_wr); + + /* + * If bfqq happened to be activated in a burst, but has been + * idle for much more than an interactive queue, then we + * assume that, in the overall I/O initiated in the burst, the + * I/O associated with bfqq is finished. So bfqq does not need + * to be treated as a queue belonging to a burst + * anymore. Accordingly, we reset bfqq's in_large_burst flag + * if set, and remove bfqq from the burst list if it's + * there. We do not decrement burst_size, because the fact + * that bfqq does not need to belong to the burst list any + * more does not invalidate the fact that bfqq was created in + * a burst. + */ + if (likely(!bfq_bfqq_just_created(bfqq)) && + idle_for_long_time && + time_is_before_jiffies( + bfqq->budget_timeout + + msecs_to_jiffies(10000))) { + hlist_del_init(&bfqq->burst_list_node); + bfq_clear_bfqq_in_large_burst(bfqq); + } + + bfq_clear_bfqq_just_created(bfqq); + + if (!bfq_bfqq_IO_bound(bfqq)) { + if (arrived_in_time) { + bfqq->requests_within_timer++; + if (bfqq->requests_within_timer >= + bfqd->bfq_requests_within_timer) + bfq_mark_bfqq_IO_bound(bfqq); + } else + bfqq->requests_within_timer = 0; + bfq_log_bfqq(bfqd, bfqq, "requests in time %d", + bfqq->requests_within_timer); + } + + if (bfqd->low_latency) { + if (unlikely(time_is_after_jiffies(bfqq->split_time))) + /* wraparound */ + bfqq->split_time = + jiffies - bfqd->bfq_wr_min_idle_time - 1; + + if (time_is_before_jiffies(bfqq->split_time + + bfqd->bfq_wr_min_idle_time)) { + bfq_update_bfqq_wr_on_rq_arrival(bfqd, bfqq, + old_wr_coeff, + wr_or_deserves_wr, + *interactive, + in_burst, + soft_rt); + + if (old_wr_coeff != bfqq->wr_coeff) + bfqq->entity.prio_changed = 1; + } + } + + bfqq->last_idle_bklogged = jiffies; + bfqq->service_from_backlogged = 0; + bfq_clear_bfqq_softrt_update(bfqq); + + bfq_add_bfqq_busy(bfqd, bfqq); + + /* + * Expire in-service queue only if preemption may be needed + * for guarantees. In this respect, the function + * next_queue_may_preempt just checks a simple, necessary + * condition, and not a sufficient condition based on + * timestamps. In fact, for the latter condition to be + * evaluated, timestamps would need first to be updated, and + * this operation is quite costly (see the comments on the + * function bfq_bfqq_update_budg_for_activation). + */ + if (bfqd->in_service_queue && bfqq_wants_to_preempt && + bfqd->in_service_queue->wr_coeff < bfqq->wr_coeff && + next_queue_may_preempt(bfqd)) { + struct bfq_queue *in_serv = + bfqd->in_service_queue; + BUG_ON(in_serv == bfqq); + + bfq_bfqq_expire(bfqd, bfqd->in_service_queue, + false, BFQ_BFQQ_PREEMPTED); + } +} + +static void bfq_add_request(struct request *rq) +{ + struct bfq_queue *bfqq = RQ_BFQQ(rq); + struct bfq_data *bfqd = bfqq->bfqd; + struct request *next_rq, *prev; + unsigned int old_wr_coeff = bfqq->wr_coeff; + bool interactive = false; + + bfq_log_bfqq(bfqd, bfqq, "add_request: size %u %s", + blk_rq_sectors(rq), rq_is_sync(rq) ? "S" : "A"); + + if (bfqq->wr_coeff > 1) /* queue is being weight-raised */ + bfq_log_bfqq(bfqd, bfqq, + "raising period dur %u/%u msec, old coeff %u, w %d(%d)", + jiffies_to_msecs(jiffies - bfqq->last_wr_start_finish), + jiffies_to_msecs(bfqq->wr_cur_max_time), + bfqq->wr_coeff, + bfqq->entity.weight, bfqq->entity.orig_weight); + + bfqq->queued[rq_is_sync(rq)]++; + bfqd->queued++; + + BUG_ON(!RQ_BFQQ(rq)); + BUG_ON(RQ_BFQQ(rq) != bfqq); + elv_rb_add(&bfqq->sort_list, rq); + + /* + * Check if this request is a better next-to-serve candidate. + */ + prev = bfqq->next_rq; + next_rq = bfq_choose_req(bfqd, bfqq->next_rq, rq, bfqd->last_position); + BUG_ON(!next_rq); + BUG_ON(!RQ_BFQQ(next_rq)); + BUG_ON(RQ_BFQQ(next_rq) != bfqq); + bfqq->next_rq = next_rq; + + /* + * Adjust priority tree position, if next_rq changes. + */ + if (prev != bfqq->next_rq) + bfq_pos_tree_add_move(bfqd, bfqq); + + if (!bfq_bfqq_busy(bfqq)) /* switching to busy ... */ + bfq_bfqq_handle_idle_busy_switch(bfqd, bfqq, old_wr_coeff, + rq, &interactive); + else { + if (bfqd->low_latency && old_wr_coeff == 1 && !rq_is_sync(rq) && + time_is_before_jiffies( + bfqq->last_wr_start_finish + + bfqd->bfq_wr_min_inter_arr_async)) { + bfqq->wr_coeff = bfqd->bfq_wr_coeff; + bfqq->wr_cur_max_time = bfq_wr_duration(bfqd); + + bfqd->wr_busy_queues++; + BUG_ON(bfqd->wr_busy_queues > bfqd->busy_queues); + bfqq->entity.prio_changed = 1; + bfq_log_bfqq(bfqd, bfqq, + "non-idle wrais starting, " + "wr_max_time %u wr_busy %d", + jiffies_to_msecs(bfqq->wr_cur_max_time), + bfqd->wr_busy_queues); + } + if (prev != bfqq->next_rq) + bfq_updated_next_req(bfqd, bfqq); + } + + /* + * Assign jiffies to last_wr_start_finish in the following + * cases: + * + * . if bfqq is not going to be weight-raised, because, for + * non weight-raised queues, last_wr_start_finish stores the + * arrival time of the last request; as of now, this piece + * of information is used only for deciding whether to + * weight-raise async queues + * + * . if bfqq is not weight-raised, because, if bfqq is now + * switching to weight-raised, then last_wr_start_finish + * stores the time when weight-raising starts + * + * . if bfqq is interactive, because, regardless of whether + * bfqq is currently weight-raised, the weight-raising + * period must start or restart (this case is considered + * separately because it is not detected by the above + * conditions, if bfqq is already weight-raised) + * + * last_wr_start_finish has to be updated also if bfqq is soft + * real-time, because the weight-raising period is constantly + * restarted on idle-to-busy transitions for these queues, but + * this is already done in bfq_bfqq_handle_idle_busy_switch if + * needed. + */ + if (bfqd->low_latency && + (old_wr_coeff == 1 || bfqq->wr_coeff == 1 || interactive)) + bfqq->last_wr_start_finish = jiffies; +} + +static struct request *bfq_find_rq_fmerge(struct bfq_data *bfqd, + struct bio *bio, + struct request_queue *q) +{ + struct bfq_queue *bfqq = bfqd->bio_bfqq; + + BUG_ON(!bfqd->bio_bfqq_set); + + if (bfqq) + return elv_rb_find(&bfqq->sort_list, bio_end_sector(bio)); + + return NULL; +} + +static sector_t get_sdist(sector_t last_pos, struct request *rq) +{ + sector_t sdist = 0; + + if (last_pos) { + if (last_pos < blk_rq_pos(rq)) + sdist = blk_rq_pos(rq) - last_pos; + else + sdist = last_pos - blk_rq_pos(rq); + } + + return sdist; +} + +#if 0 /* Still not clear if we can do without next two functions */ +static void bfq_activate_request(struct request_queue *q, struct request *rq) +{ + struct bfq_data *bfqd = q->elevator->elevator_data; + bfqd->rq_in_driver++; +} + +static void bfq_deactivate_request(struct request_queue *q, struct request *rq) +{ + struct bfq_data *bfqd = q->elevator->elevator_data; + + BUG_ON(bfqd->rq_in_driver == 0); + bfqd->rq_in_driver--; +} +#endif + +static void bfq_remove_request(struct request_queue *q, + struct request *rq) +{ + struct bfq_queue *bfqq = RQ_BFQQ(rq); + struct bfq_data *bfqd = bfqq->bfqd; + const int sync = rq_is_sync(rq); + + BUG_ON(bfqq->entity.service > bfqq->entity.budget && + bfqq == bfqd->in_service_queue); + + if (bfqq->next_rq == rq) { + bfqq->next_rq = bfq_find_next_rq(bfqd, bfqq, rq); + if (bfqq->next_rq && !RQ_BFQQ(bfqq->next_rq)) { + pr_crit("no bfqq! for next rq %p bfqq %p\n", + bfqq->next_rq, bfqq); + } + + BUG_ON(bfqq->next_rq && !RQ_BFQQ(bfqq->next_rq)); + if (bfqq->next_rq && RQ_BFQQ(bfqq->next_rq) != bfqq) { + pr_crit( + "wrong bfqq! for next rq %p, rq_bfqq %p bfqq %p\n", + bfqq->next_rq, RQ_BFQQ(bfqq->next_rq), bfqq); + } + BUG_ON(bfqq->next_rq && RQ_BFQQ(bfqq->next_rq) != bfqq); + + bfq_updated_next_req(bfqd, bfqq); + } + + if (rq->queuelist.prev != &rq->queuelist) + list_del_init(&rq->queuelist); + BUG_ON(bfqq->queued[sync] == 0); + bfqq->queued[sync]--; + bfqd->queued--; + elv_rb_del(&bfqq->sort_list, rq); + + elv_rqhash_del(q, rq); + if (q->last_merge == rq) + q->last_merge = NULL; + + if (RB_EMPTY_ROOT(&bfqq->sort_list)) { + bfqq->next_rq = NULL; + + BUG_ON(bfqq->entity.budget < 0); + + if (bfq_bfqq_busy(bfqq) && bfqq != bfqd->in_service_queue) { + BUG_ON(bfqq->ref < 2); /* referred by rq and on tree */ + bfq_del_bfqq_busy(bfqd, bfqq, false); + /* + * bfqq emptied. In normal operation, when + * bfqq is empty, bfqq->entity.service and + * bfqq->entity.budget must contain, + * respectively, the service received and the + * budget used last time bfqq emptied. These + * facts do not hold in this case, as at least + * this last removal occurred while bfqq is + * not in service. To avoid inconsistencies, + * reset both bfqq->entity.service and + * bfqq->entity.budget, if bfqq has still a + * process that may issue I/O requests to it. + */ + bfqq->entity.budget = bfqq->entity.service = 0; + } + + /* + * Remove queue from request-position tree as it is empty. + */ + if (bfqq->pos_root) { + rb_erase(&bfqq->pos_node, bfqq->pos_root); + bfqq->pos_root = NULL; + } + } + + if (rq->cmd_flags & REQ_META) { + BUG_ON(bfqq->meta_pending == 0); + bfqq->meta_pending--; + } + bfqg_stats_update_io_remove(bfqq_group(bfqq), rq->cmd_flags); +} + +static bool bfq_bio_merge(struct blk_mq_hw_ctx *hctx, struct bio *bio) +{ + struct request_queue *q = hctx->queue; + struct bfq_data *bfqd = q->elevator->elevator_data; + struct request *free = NULL; + /* + * bfq_bic_lookup grabs the queue_lock: invoke it now and + * store its return value for later use, to avoid nesting + * queue_lock inside the bfqd->lock. We assume that the bic + * returned by bfq_bic_lookup does not go away before + * bfqd->lock is taken. + */ + struct bfq_io_cq *bic = bfq_bic_lookup(bfqd, current->io_context, q); + bool ret; + + spin_lock_irq(&bfqd->lock); + + if (bic) + bfqd->bio_bfqq = bic_to_bfqq(bic, op_is_sync(bio->bi_opf)); + else + bfqd->bio_bfqq = NULL; + bfqd->bio_bic = bic; + /* Set next flag just for testing purposes */ + bfqd->bio_bfqq_set = true; + + ret = blk_mq_sched_try_merge(q, bio, &free); + + /* + * XXX Not yet freeing without lock held, to avoid an + * inconsistency with respect to the lock-protected invocation + * of blk_mq_sched_try_insert_merge in bfq_bio_merge. Waiting + * for clarifications from Jens. + */ + if (free) + blk_mq_free_request(free); + bfqd->bio_bfqq_set = false; + spin_unlock_irq(&bfqd->lock); + + return ret; +} + +static int bfq_request_merge(struct request_queue *q, struct request **req, + struct bio *bio) +{ + struct bfq_data *bfqd = q->elevator->elevator_data; + struct request *__rq; + + __rq = bfq_find_rq_fmerge(bfqd, bio, q); + if (__rq && elv_bio_merge_ok(__rq, bio)) { + *req = __rq; + bfq_log(bfqd, "request_merge: req %p", __rq); + + return ELEVATOR_FRONT_MERGE; + } + + return ELEVATOR_NO_MERGE; +} + +static void bfq_request_merged(struct request_queue *q, struct request *req, + enum elv_merge type) +{ + BUG_ON(req->rq_flags & RQF_DISP_LIST); + + if (type == ELEVATOR_FRONT_MERGE && + rb_prev(&req->rb_node) && + blk_rq_pos(req) < + blk_rq_pos(container_of(rb_prev(&req->rb_node), + struct request, rb_node))) { + struct bfq_queue *bfqq = RQ_BFQQ(req); + struct bfq_data *bfqd = bfqq->bfqd; + struct request *prev, *next_rq; + + /* Reposition request in its sort_list */ + elv_rb_del(&bfqq->sort_list, req); + BUG_ON(!RQ_BFQQ(req)); + BUG_ON(RQ_BFQQ(req) != bfqq); + elv_rb_add(&bfqq->sort_list, req); + + /* Choose next request to be served for bfqq */ + prev = bfqq->next_rq; + next_rq = bfq_choose_req(bfqd, bfqq->next_rq, req, + bfqd->last_position); + BUG_ON(!next_rq); + + bfqq->next_rq = next_rq; + + bfq_log_bfqq(bfqd, bfqq, + "requests_merged: req %p prev %p next_rq %p bfqq %p", + req, prev, next_rq, bfqq); + + /* + * If next_rq changes, update both the queue's budget to + * fit the new request and the queue's position in its + * rq_pos_tree. + */ + if (prev != bfqq->next_rq) { + bfq_updated_next_req(bfqd, bfqq); + bfq_pos_tree_add_move(bfqd, bfqq); + } + } +} + +static void bfq_requests_merged(struct request_queue *q, struct request *rq, + struct request *next) +{ + struct bfq_queue *bfqq = RQ_BFQQ(rq), *next_bfqq = RQ_BFQQ(next); + + BUG_ON(!RQ_BFQQ(rq)); + BUG_ON(!RQ_BFQQ(next)); + BUG_ON(rq->rq_flags & RQF_DISP_LIST); + BUG_ON(next->rq_flags & RQF_DISP_LIST); + + if (!RB_EMPTY_NODE(&rq->rb_node)) + goto end; + + bfq_log_bfqq(bfqq->bfqd, bfqq, + "requests_merged: rq %p next %p bfqq %p next_bfqq %p", + rq, next, bfqq, next_bfqq); + + spin_lock_irq(&bfqq->bfqd->lock); + + /* + * If next and rq belong to the same bfq_queue and next is older + * than rq, then reposition rq in the fifo (by substituting next + * with rq). Otherwise, if next and rq belong to different + * bfq_queues, never reposition rq: in fact, we would have to + * reposition it with respect to next's position in its own fifo, + * which would most certainly be too expensive with respect to + * the benefits. + */ + if (bfqq == next_bfqq && + !list_empty(&rq->queuelist) && !list_empty(&next->queuelist) && + next->fifo_time < rq->fifo_time) { + list_del_init(&rq->queuelist); + list_replace_init(&next->queuelist, &rq->queuelist); + rq->fifo_time = next->fifo_time; + } + + if (bfqq->next_rq == next) + bfqq->next_rq = rq; + + bfq_remove_request(q, next); + + spin_unlock_irq(&bfqq->bfqd->lock); +end: + bfqg_stats_update_io_merged(bfqq_group(bfqq), next->cmd_flags); +} + +/* Must be called with bfqq != NULL */ +static void bfq_bfqq_end_wr(struct bfq_queue *bfqq) +{ + BUG_ON(!bfqq); + + if (bfq_bfqq_busy(bfqq)) { + bfqq->bfqd->wr_busy_queues--; + BUG_ON(bfqq->bfqd->wr_busy_queues < 0); + } + bfqq->wr_coeff = 1; + bfqq->wr_cur_max_time = 0; + bfqq->last_wr_start_finish = jiffies; + /* + * Trigger a weight change on the next invocation of + * __bfq_entity_update_weight_prio. + */ + bfqq->entity.prio_changed = 1; + bfq_log_bfqq(bfqq->bfqd, bfqq, + "end_wr: wrais ending at %lu, rais_max_time %u", + bfqq->last_wr_start_finish, + jiffies_to_msecs(bfqq->wr_cur_max_time)); + bfq_log_bfqq(bfqq->bfqd, bfqq, "end_wr: wr_busy %d", + bfqq->bfqd->wr_busy_queues); +} + +static void bfq_end_wr_async_queues(struct bfq_data *bfqd, + struct bfq_group *bfqg) +{ + int i, j; + + for (i = 0; i < 2; i++) + for (j = 0; j < IOPRIO_BE_NR; j++) + if (bfqg->async_bfqq[i][j]) + bfq_bfqq_end_wr(bfqg->async_bfqq[i][j]); + if (bfqg->async_idle_bfqq) + bfq_bfqq_end_wr(bfqg->async_idle_bfqq); +} + +static void bfq_end_wr(struct bfq_data *bfqd) +{ + struct bfq_queue *bfqq; + + spin_lock_irq(&bfqd->lock); + + list_for_each_entry(bfqq, &bfqd->active_list, bfqq_list) + bfq_bfqq_end_wr(bfqq); + list_for_each_entry(bfqq, &bfqd->idle_list, bfqq_list) + bfq_bfqq_end_wr(bfqq); + bfq_end_wr_async(bfqd); + + spin_unlock_irq(&bfqd->lock); +} + +static sector_t bfq_io_struct_pos(void *io_struct, bool request) +{ + if (request) + return blk_rq_pos(io_struct); + else + return ((struct bio *)io_struct)->bi_iter.bi_sector; +} + +static int bfq_rq_close_to_sector(void *io_struct, bool request, + sector_t sector) +{ + return abs(bfq_io_struct_pos(io_struct, request) - sector) <= + BFQQ_CLOSE_THR; +} + +static struct bfq_queue *bfqq_find_close(struct bfq_data *bfqd, + struct bfq_queue *bfqq, + sector_t sector) +{ + struct rb_root *root = &bfq_bfqq_to_bfqg(bfqq)->rq_pos_tree; + struct rb_node *parent, *node; + struct bfq_queue *__bfqq; + + if (RB_EMPTY_ROOT(root)) + return NULL; + + /* + * First, if we find a request starting at the end of the last + * request, choose it. + */ + __bfqq = bfq_rq_pos_tree_lookup(bfqd, root, sector, &parent, NULL); + if (__bfqq) + return __bfqq; + + /* + * If the exact sector wasn't found, the parent of the NULL leaf + * will contain the closest sector (rq_pos_tree sorted by + * next_request position). + */ + __bfqq = rb_entry(parent, struct bfq_queue, pos_node); + if (bfq_rq_close_to_sector(__bfqq->next_rq, true, sector)) + return __bfqq; + + if (blk_rq_pos(__bfqq->next_rq) < sector) + node = rb_next(&__bfqq->pos_node); + else + node = rb_prev(&__bfqq->pos_node); + if (!node) + return NULL; + + __bfqq = rb_entry(node, struct bfq_queue, pos_node); + if (bfq_rq_close_to_sector(__bfqq->next_rq, true, sector)) + return __bfqq; + + return NULL; +} + +static struct bfq_queue *bfq_find_close_cooperator(struct bfq_data *bfqd, + struct bfq_queue *cur_bfqq, + sector_t sector) +{ + struct bfq_queue *bfqq; + + /* + * We shall notice if some of the queues are cooperating, + * e.g., working closely on the same area of the device. In + * that case, we can group them together and: 1) don't waste + * time idling, and 2) serve the union of their requests in + * the best possible order for throughput. + */ + bfqq = bfqq_find_close(bfqd, cur_bfqq, sector); + if (!bfqq || bfqq == cur_bfqq) + return NULL; + + return bfqq; +} + +static struct bfq_queue * +bfq_setup_merge(struct bfq_queue *bfqq, struct bfq_queue *new_bfqq) +{ + int process_refs, new_process_refs; + struct bfq_queue *__bfqq; + + /* + * If there are no process references on the new_bfqq, then it is + * unsafe to follow the ->new_bfqq chain as other bfqq's in the chain + * may have dropped their last reference (not just their last process + * reference). + */ + if (!bfqq_process_refs(new_bfqq)) + return NULL; + + /* Avoid a circular list and skip interim queue merges. */ + while ((__bfqq = new_bfqq->new_bfqq)) { + if (__bfqq == bfqq) + return NULL; + new_bfqq = __bfqq; + } + + process_refs = bfqq_process_refs(bfqq); + new_process_refs = bfqq_process_refs(new_bfqq); + /* + * If the process for the bfqq has gone away, there is no + * sense in merging the queues. + */ + if (process_refs == 0 || new_process_refs == 0) + return NULL; + + bfq_log_bfqq(bfqq->bfqd, bfqq, "scheduling merge with queue %d", + new_bfqq->pid); + + /* + * Merging is just a redirection: the requests of the process + * owning one of the two queues are redirected to the other queue. + * The latter queue, in its turn, is set as shared if this is the + * first time that the requests of some process are redirected to + * it. + * + * We redirect bfqq to new_bfqq and not the opposite, because + * we are in the context of the process owning bfqq, thus we + * have the io_cq of this process. So we can immediately + * configure this io_cq to redirect the requests of the + * process to new_bfqq. In contrast, the io_cq of new_bfqq is + * not available any more (new_bfqq->bic == NULL). + * + * Anyway, even in case new_bfqq coincides with the in-service + * queue, redirecting requests the in-service queue is the + * best option, as we feed the in-service queue with new + * requests close to the last request served and, by doing so, + * are likely to increase the throughput. + */ + bfqq->new_bfqq = new_bfqq; + new_bfqq->ref += process_refs; + return new_bfqq; +} + +static bool bfq_may_be_close_cooperator(struct bfq_queue *bfqq, + struct bfq_queue *new_bfqq) +{ + if (bfq_class_idle(bfqq) || bfq_class_idle(new_bfqq) || + (bfqq->ioprio_class != new_bfqq->ioprio_class)) + return false; + + /* + * If either of the queues has already been detected as seeky, + * then merging it with the other queue is unlikely to lead to + * sequential I/O. + */ + if (BFQQ_SEEKY(bfqq) || BFQQ_SEEKY(new_bfqq)) + return false; + + /* + * Interleaved I/O is known to be done by (some) applications + * only for reads, so it does not make sense to merge async + * queues. + */ + if (!bfq_bfqq_sync(bfqq) || !bfq_bfqq_sync(new_bfqq)) + return false; + + return true; +} + +/* + * If this function returns true, then bfqq cannot be merged. The idea + * is that true cooperation happens very early after processes start + * to do I/O. Usually, late cooperations are just accidental false + * positives. In case bfqq is weight-raised, such false positives + * would evidently degrade latency guarantees for bfqq. + */ +static bool wr_from_too_long(struct bfq_queue *bfqq) +{ + return bfqq->wr_coeff > 1 && + time_is_before_jiffies(bfqq->last_wr_start_finish + + msecs_to_jiffies(100)); +} + +/* + * Attempt to schedule a merge of bfqq with the currently in-service + * queue or with a close queue among the scheduled queues. Return + * NULL if no merge was scheduled, a pointer to the shared bfq_queue + * structure otherwise. + * + * The OOM queue is not allowed to participate to cooperation: in fact, since + * the requests temporarily redirected to the OOM queue could be redirected + * again to dedicated queues at any time, the state needed to correctly + * handle merging with the OOM queue would be quite complex and expensive + * to maintain. Besides, in such a critical condition as an out of memory, + * the benefits of queue merging may be little relevant, or even negligible. + * + * Weight-raised queues can be merged only if their weight-raising + * period has just started. In fact cooperating processes are usually + * started together. Thus, with this filter we avoid false positives + * that would jeopardize low-latency guarantees. + * + * WARNING: queue merging may impair fairness among non-weight raised + * queues, for at least two reasons: 1) the original weight of a + * merged queue may change during the merged state, 2) even being the + * weight the same, a merged queue may be bloated with many more + * requests than the ones produced by its originally-associated + * process. + */ +static struct bfq_queue * +bfq_setup_cooperator(struct bfq_data *bfqd, struct bfq_queue *bfqq, + void *io_struct, bool request) +{ + struct bfq_queue *in_service_bfqq, *new_bfqq; + + if (bfqq->new_bfqq) + return bfqq->new_bfqq; + + if (io_struct && wr_from_too_long(bfqq) && + likely(bfqq != &bfqd->oom_bfqq)) + bfq_log_bfqq(bfqd, bfqq, + "would have looked for coop, but bfq%d wr", + bfqq->pid); + + if (!io_struct || + wr_from_too_long(bfqq) || + unlikely(bfqq == &bfqd->oom_bfqq)) + return NULL; + + /* If there is only one backlogged queue, don't search. */ + if (bfqd->busy_queues == 1) + return NULL; + + in_service_bfqq = bfqd->in_service_queue; + + if (in_service_bfqq && in_service_bfqq != bfqq && + wr_from_too_long(in_service_bfqq) + && likely(in_service_bfqq == &bfqd->oom_bfqq)) + bfq_log_bfqq(bfqd, bfqq, + "would have tried merge with in-service-queue, but wr"); + + if (!in_service_bfqq || in_service_bfqq == bfqq + || wr_from_too_long(in_service_bfqq) || + unlikely(in_service_bfqq == &bfqd->oom_bfqq)) + goto check_scheduled; + + if (bfq_rq_close_to_sector(io_struct, request, bfqd->last_position) && + bfqq->entity.parent == in_service_bfqq->entity.parent && + bfq_may_be_close_cooperator(bfqq, in_service_bfqq)) { + new_bfqq = bfq_setup_merge(bfqq, in_service_bfqq); + if (new_bfqq) + return new_bfqq; + } + /* + * Check whether there is a cooperator among currently scheduled + * queues. The only thing we need is that the bio/request is not + * NULL, as we need it to establish whether a cooperator exists. + */ +check_scheduled: + new_bfqq = bfq_find_close_cooperator(bfqd, bfqq, + bfq_io_struct_pos(io_struct, request)); + + BUG_ON(new_bfqq && bfqq->entity.parent != new_bfqq->entity.parent); + + if (new_bfqq && wr_from_too_long(new_bfqq) && + likely(new_bfqq != &bfqd->oom_bfqq) && + bfq_may_be_close_cooperator(bfqq, new_bfqq)) + bfq_log_bfqq(bfqd, bfqq, + "would have merged with bfq%d, but wr", + new_bfqq->pid); + + if (new_bfqq && !wr_from_too_long(new_bfqq) && + likely(new_bfqq != &bfqd->oom_bfqq) && + bfq_may_be_close_cooperator(bfqq, new_bfqq)) + return bfq_setup_merge(bfqq, new_bfqq); + + return NULL; +} + +static void bfq_bfqq_save_state(struct bfq_queue *bfqq) +{ + struct bfq_io_cq *bic = bfqq->bic; + + /* + * If !bfqq->bic, the queue is already shared or its requests + * have already been redirected to a shared queue; both idle window + * and weight raising state have already been saved. Do nothing. + */ + if (!bic) + return; + + bic->saved_ttime = bfqq->ttime; + bic->saved_has_short_ttime = bfq_bfqq_has_short_ttime(bfqq); + bic->saved_IO_bound = bfq_bfqq_IO_bound(bfqq); + bic->saved_in_large_burst = bfq_bfqq_in_large_burst(bfqq); + bic->was_in_burst_list = !hlist_unhashed(&bfqq->burst_list_node); + bic->saved_wr_coeff = bfqq->wr_coeff; + bic->saved_wr_start_at_switch_to_srt = bfqq->wr_start_at_switch_to_srt; + bic->saved_last_wr_start_finish = bfqq->last_wr_start_finish; + bic->saved_wr_cur_max_time = bfqq->wr_cur_max_time; + BUG_ON(time_is_after_jiffies(bfqq->last_wr_start_finish)); +} + +static void +bfq_merge_bfqqs(struct bfq_data *bfqd, struct bfq_io_cq *bic, + struct bfq_queue *bfqq, struct bfq_queue *new_bfqq) +{ + bfq_log_bfqq(bfqd, bfqq, "merging with queue %lu", + (unsigned long) new_bfqq->pid); + BUG_ON(bfqq->bic && bfqq->bic == new_bfqq->bic); + /* Save weight raising and idle window of the merged queues */ + bfq_bfqq_save_state(bfqq); + bfq_bfqq_save_state(new_bfqq); + + if (bfq_bfqq_IO_bound(bfqq)) + bfq_mark_bfqq_IO_bound(new_bfqq); + bfq_clear_bfqq_IO_bound(bfqq); + + /* + * If bfqq is weight-raised, then let new_bfqq inherit + * weight-raising. To reduce false positives, neglect the case + * where bfqq has just been created, but has not yet made it + * to be weight-raised (which may happen because EQM may merge + * bfqq even before bfq_add_request is executed for the first + * time for bfqq). Handling this case would however be very + * easy, thanks to the flag just_created. + */ + if (new_bfqq->wr_coeff == 1 && bfqq->wr_coeff > 1) { + new_bfqq->wr_coeff = bfqq->wr_coeff; + new_bfqq->wr_cur_max_time = bfqq->wr_cur_max_time; + new_bfqq->last_wr_start_finish = bfqq->last_wr_start_finish; + new_bfqq->wr_start_at_switch_to_srt = + bfqq->wr_start_at_switch_to_srt; + if (bfq_bfqq_busy(new_bfqq)) { + bfqd->wr_busy_queues++; + BUG_ON(bfqd->wr_busy_queues > bfqd->busy_queues); + } + + new_bfqq->entity.prio_changed = 1; + bfq_log_bfqq(bfqd, new_bfqq, + "wr start after merge with %d, rais_max_time %u", + bfqq->pid, + jiffies_to_msecs(bfqq->wr_cur_max_time)); + } + + if (bfqq->wr_coeff > 1) { /* bfqq has given its wr to new_bfqq */ + bfqq->wr_coeff = 1; + bfqq->entity.prio_changed = 1; + if (bfq_bfqq_busy(bfqq)) { + bfqd->wr_busy_queues--; + BUG_ON(bfqd->wr_busy_queues < 0); + } + + } + + bfq_log_bfqq(bfqd, new_bfqq, "merge_bfqqs: wr_busy %d", + bfqd->wr_busy_queues); + + /* + * Merge queues (that is, let bic redirect its requests to new_bfqq) + */ + bic_set_bfqq(bic, new_bfqq, 1); + bfq_mark_bfqq_coop(new_bfqq); + /* + * new_bfqq now belongs to at least two bics (it is a shared queue): + * set new_bfqq->bic to NULL. bfqq either: + * - does not belong to any bic any more, and hence bfqq->bic must + * be set to NULL, or + * - is a queue whose owning bics have already been redirected to a + * different queue, hence the queue is destined to not belong to + * any bic soon and bfqq->bic is already NULL (therefore the next + * assignment causes no harm). + */ + new_bfqq->bic = NULL; + bfqq->bic = NULL; + /* release process reference to bfqq */ + bfq_put_queue(bfqq); +} + +static bool bfq_allow_bio_merge(struct request_queue *q, struct request *rq, + struct bio *bio) +{ + struct bfq_data *bfqd = q->elevator->elevator_data; + bool is_sync = op_is_sync(bio->bi_opf); + struct bfq_queue *bfqq = bfqd->bio_bfqq, *new_bfqq; + + assert_spin_locked(&bfqd->lock); + /* + * Disallow merge of a sync bio into an async request. + */ + if (is_sync && !rq_is_sync(rq)) + return false; + + /* + * Lookup the bfqq that this bio will be queued with. Allow + * merge only if rq is queued there. + */ + BUG_ON(!bfqd->bio_bfqq_set); + if (!bfqq) + return false; + + /* + * We take advantage of this function to perform an early merge + * of the queues of possible cooperating processes. + */ + new_bfqq = bfq_setup_cooperator(bfqd, bfqq, bio, false); + BUG_ON(new_bfqq == bfqq); + if (new_bfqq) { + /* + * bic still points to bfqq, then it has not yet been + * redirected to some other bfq_queue, and a queue + * merge beween bfqq and new_bfqq can be safely + * fulfillled, i.e., bic can be redirected to new_bfqq + * and bfqq can be put. + */ + bfq_merge_bfqqs(bfqd, bfqd->bio_bic, bfqq, + new_bfqq); + /* + * If we get here, bio will be queued into new_queue, + * so use new_bfqq to decide whether bio and rq can be + * merged. + */ + bfqq = new_bfqq; + + /* + * Change also bqfd->bio_bfqq, as + * bfqd->bio_bic now points to new_bfqq, and + * this function may be invoked again (and then may + * use again bqfd->bio_bfqq). + */ + bfqd->bio_bfqq = bfqq; + } + return bfqq == RQ_BFQQ(rq); +} + +/* + * Set the maximum time for the in-service queue to consume its + * budget. This prevents seeky processes from lowering the throughput. + * In practice, a time-slice service scheme is used with seeky + * processes. + */ +static void bfq_set_budget_timeout(struct bfq_data *bfqd, + struct bfq_queue *bfqq) +{ + unsigned int timeout_coeff; + + if (bfqq->wr_cur_max_time == bfqd->bfq_wr_rt_max_time) + timeout_coeff = 1; + else + timeout_coeff = bfqq->entity.weight / bfqq->entity.orig_weight; + + bfqd->last_budget_start = ktime_get(); + + bfqq->budget_timeout = jiffies + + bfqd->bfq_timeout * timeout_coeff; + + bfq_log_bfqq(bfqd, bfqq, "set budget_timeout %u", + jiffies_to_msecs(bfqd->bfq_timeout * timeout_coeff)); +} + +static void __bfq_set_in_service_queue(struct bfq_data *bfqd, + struct bfq_queue *bfqq) +{ + if (bfqq) { + bfqg_stats_update_avg_queue_size(bfqq_group(bfqq)); + bfq_clear_bfqq_fifo_expire(bfqq); + + bfqd->budgets_assigned = (bfqd->budgets_assigned*7 + 256) / 8; + + BUG_ON(bfqq == bfqd->in_service_queue); + BUG_ON(RB_EMPTY_ROOT(&bfqq->sort_list)); + + if (time_is_before_jiffies(bfqq->last_wr_start_finish) && + bfqq->wr_coeff > 1 && + bfqq->wr_cur_max_time == bfqd->bfq_wr_rt_max_time && + time_is_before_jiffies(bfqq->budget_timeout)) { + /* + * For soft real-time queues, move the start + * of the weight-raising period forward by the + * time the queue has not received any + * service. Otherwise, a relatively long + * service delay is likely to cause the + * weight-raising period of the queue to end, + * because of the short duration of the + * weight-raising period of a soft real-time + * queue. It is worth noting that this move + * is not so dangerous for the other queues, + * because soft real-time queues are not + * greedy. + * + * To not add a further variable, we use the + * overloaded field budget_timeout to + * determine for how long the queue has not + * received service, i.e., how much time has + * elapsed since the queue expired. However, + * this is a little imprecise, because + * budget_timeout is set to jiffies if bfqq + * not only expires, but also remains with no + * request. + */ + if (time_after(bfqq->budget_timeout, + bfqq->last_wr_start_finish)) + bfqq->last_wr_start_finish += + jiffies - bfqq->budget_timeout; + else + bfqq->last_wr_start_finish = jiffies; + + if (time_is_after_jiffies(bfqq->last_wr_start_finish)) { + pr_crit( + "BFQ WARNING:last %lu budget %lu jiffies %lu", + bfqq->last_wr_start_finish, + bfqq->budget_timeout, + jiffies); + pr_crit("diff %lu", jiffies - + max_t(unsigned long, + bfqq->last_wr_start_finish, + bfqq->budget_timeout)); + bfqq->last_wr_start_finish = jiffies; + } + } + + bfq_set_budget_timeout(bfqd, bfqq); + bfq_log_bfqq(bfqd, bfqq, + "set_in_service_queue, cur-budget = %d", + bfqq->entity.budget); + } else + bfq_log(bfqd, "set_in_service_queue: NULL"); + + bfqd->in_service_queue = bfqq; +} + +/* + * Get and set a new queue for service. + */ +static struct bfq_queue *bfq_set_in_service_queue(struct bfq_data *bfqd) +{ + struct bfq_queue *bfqq = bfq_get_next_queue(bfqd); + + __bfq_set_in_service_queue(bfqd, bfqq); + return bfqq; +} + +static void bfq_arm_slice_timer(struct bfq_data *bfqd) +{ + struct bfq_queue *bfqq = bfqd->in_service_queue; + u32 sl; + + BUG_ON(!RB_EMPTY_ROOT(&bfqq->sort_list)); + + bfq_mark_bfqq_wait_request(bfqq); + + /* + * We don't want to idle for seeks, but we do want to allow + * fair distribution of slice time for a process doing back-to-back + * seeks. So allow a little bit of time for him to submit a new rq. + * + * To prevent processes with (partly) seeky workloads from + * being too ill-treated, grant them a small fraction of the + * assigned budget before reducing the waiting time to + * BFQ_MIN_TT. This happened to help reduce latency. + */ + sl = bfqd->bfq_slice_idle; + /* + * Unless the queue is being weight-raised or the scenario is + * asymmetric, grant only minimum idle time if the queue + * is seeky. A long idling is preserved for a weight-raised + * queue, or, more in general, in an asymemtric scenario, + * because a long idling is needed for guaranteeing to a queue + * its reserved share of the throughput (in particular, it is + * needed if the queue has a higher weight than some other + * queue). + */ + if (BFQQ_SEEKY(bfqq) && bfqq->wr_coeff == 1 && + bfq_symmetric_scenario(bfqd)) + sl = min_t(u32, sl, BFQ_MIN_TT); + + bfqd->last_idling_start = ktime_get(); + hrtimer_start(&bfqd->idle_slice_timer, ns_to_ktime(sl), + HRTIMER_MODE_REL); + bfqg_stats_set_start_idle_time(bfqq_group(bfqq)); + bfq_log(bfqd, "arm idle: %ld/%ld ms", + sl / NSEC_PER_MSEC, bfqd->bfq_slice_idle / NSEC_PER_MSEC); +} + +/* + * In autotuning mode, max_budget is dynamically recomputed as the + * amount of sectors transferred in timeout at the estimated peak + * rate. This enables BFQ to utilize a full timeslice with a full + * budget, even if the in-service queue is served at peak rate. And + * this maximises throughput with sequential workloads. + */ +static unsigned long bfq_calc_max_budget(struct bfq_data *bfqd) +{ + return (u64)bfqd->peak_rate * USEC_PER_MSEC * + jiffies_to_msecs(bfqd->bfq_timeout)>>BFQ_RATE_SHIFT; +} + +/* + * Update parameters related to throughput and responsiveness, as a + * function of the estimated peak rate. See comments on + * bfq_calc_max_budget(), and on T_slow and T_fast arrays. + */ +static void update_thr_responsiveness_params(struct bfq_data *bfqd) +{ + int dev_type = blk_queue_nonrot(bfqd->queue); + + if (bfqd->bfq_user_max_budget == 0) { + bfqd->bfq_max_budget = + bfq_calc_max_budget(bfqd); + BUG_ON(bfqd->bfq_max_budget < 0); + bfq_log(bfqd, "new max_budget = %d", + bfqd->bfq_max_budget); + } + + if (bfqd->device_speed == BFQ_BFQD_FAST && + bfqd->peak_rate < device_speed_thresh[dev_type]) { + bfqd->device_speed = BFQ_BFQD_SLOW; + bfqd->RT_prod = R_slow[dev_type] * + T_slow[dev_type]; + } else if (bfqd->device_speed == BFQ_BFQD_SLOW && + bfqd->peak_rate > device_speed_thresh[dev_type]) { + bfqd->device_speed = BFQ_BFQD_FAST; + bfqd->RT_prod = R_fast[dev_type] * + T_fast[dev_type]; + } + + bfq_log(bfqd, +"dev_type %s dev_speed_class = %s (%llu sects/sec), thresh %llu setcs/sec", + dev_type == 0 ? "ROT" : "NONROT", + bfqd->device_speed == BFQ_BFQD_FAST ? "FAST" : "SLOW", + bfqd->device_speed == BFQ_BFQD_FAST ? + (USEC_PER_SEC*(u64)R_fast[dev_type])>>BFQ_RATE_SHIFT : + (USEC_PER_SEC*(u64)R_slow[dev_type])>>BFQ_RATE_SHIFT, + (USEC_PER_SEC*(u64)device_speed_thresh[dev_type])>> + BFQ_RATE_SHIFT); +} + +static void bfq_reset_rate_computation(struct bfq_data *bfqd, struct request *rq) +{ + if (rq != NULL) { /* new rq dispatch now, reset accordingly */ + bfqd->last_dispatch = bfqd->first_dispatch = ktime_get_ns() ; + bfqd->peak_rate_samples = 1; + bfqd->sequential_samples = 0; + bfqd->tot_sectors_dispatched = bfqd->last_rq_max_size = + blk_rq_sectors(rq); + } else /* no new rq dispatched, just reset the number of samples */ + bfqd->peak_rate_samples = 0; /* full re-init on next disp. */ + + bfq_log(bfqd, + "reset_rate_computation at end, sample %u/%u tot_sects %llu", + bfqd->peak_rate_samples, bfqd->sequential_samples, + bfqd->tot_sectors_dispatched); +} + +static void bfq_update_rate_reset(struct bfq_data *bfqd, struct request *rq) +{ + u32 rate, weight, divisor; + + /* + * For the convergence property to hold (see comments on + * bfq_update_peak_rate()) and for the assessment to be + * reliable, a minimum number of samples must be present, and + * a minimum amount of time must have elapsed. If not so, do + * not compute new rate. Just reset parameters, to get ready + * for a new evaluation attempt. + */ + if (bfqd->peak_rate_samples < BFQ_RATE_MIN_SAMPLES || + bfqd->delta_from_first < BFQ_RATE_MIN_INTERVAL) { + bfq_log(bfqd, + "update_rate_reset: only resetting, delta_first %lluus samples %d", + bfqd->delta_from_first>>10, bfqd->peak_rate_samples); + goto reset_computation; + } + + /* + * If a new request completion has occurred after last + * dispatch, then, to approximate the rate at which requests + * have been served by the device, it is more precise to + * extend the observation interval to the last completion. + */ + bfqd->delta_from_first = + max_t(u64, bfqd->delta_from_first, + bfqd->last_completion - bfqd->first_dispatch); + + BUG_ON(bfqd->delta_from_first == 0); + /* + * Rate computed in sects/usec, and not sects/nsec, for + * precision issues. + */ + rate = div64_ul(bfqd->tot_sectors_dispatched<delta_from_first, NSEC_PER_USEC)); + + bfq_log(bfqd, +"update_rate_reset: tot_sects %llu delta_first %lluus rate %llu sects/s (%d)", + bfqd->tot_sectors_dispatched, bfqd->delta_from_first>>10, + ((USEC_PER_SEC*(u64)rate)>>BFQ_RATE_SHIFT), + rate > 20< 20M sectors/sec) + */ + if ((bfqd->sequential_samples < (3 * bfqd->peak_rate_samples)>>2 && + rate <= bfqd->peak_rate) || + rate > 20<peak_rate_samples, bfqd->sequential_samples, + ((USEC_PER_SEC*(u64)rate)>>BFQ_RATE_SHIFT), + ((USEC_PER_SEC*(u64)bfqd->peak_rate)>>BFQ_RATE_SHIFT)); + goto reset_computation; + } else { + bfq_log(bfqd, + "update_rate_reset: do update, samples %u/%u rate/peak %llu/%llu", + bfqd->peak_rate_samples, bfqd->sequential_samples, + ((USEC_PER_SEC*(u64)rate)>>BFQ_RATE_SHIFT), + ((USEC_PER_SEC*(u64)bfqd->peak_rate)>>BFQ_RATE_SHIFT)); + } + + /* + * We have to update the peak rate, at last! To this purpose, + * we use a low-pass filter. We compute the smoothing constant + * of the filter as a function of the 'weight' of the new + * measured rate. + * + * As can be seen in next formulas, we define this weight as a + * quantity proportional to how sequential the workload is, + * and to how long the observation time interval is. + * + * The weight runs from 0 to 8. The maximum value of the + * weight, 8, yields the minimum value for the smoothing + * constant. At this minimum value for the smoothing constant, + * the measured rate contributes for half of the next value of + * the estimated peak rate. + * + * So, the first step is to compute the weight as a function + * of how sequential the workload is. Note that the weight + * cannot reach 9, because bfqd->sequential_samples cannot + * become equal to bfqd->peak_rate_samples, which, in its + * turn, holds true because bfqd->sequential_samples is not + * incremented for the first sample. + */ + weight = (9 * bfqd->sequential_samples) / bfqd->peak_rate_samples; + + /* + * Second step: further refine the weight as a function of the + * duration of the observation interval. + */ + weight = min_t(u32, 8, + div_u64(weight * bfqd->delta_from_first, + BFQ_RATE_REF_INTERVAL)); + + /* + * Divisor ranging from 10, for minimum weight, to 2, for + * maximum weight. + */ + divisor = 10 - weight; + BUG_ON(divisor == 0); + + /* + * Finally, update peak rate: + * + * peak_rate = peak_rate * (divisor-1) / divisor + rate / divisor + */ + bfqd->peak_rate *= divisor-1; + bfqd->peak_rate /= divisor; + rate /= divisor; /* smoothing constant alpha = 1/divisor */ + + bfq_log(bfqd, + "update_rate_reset: divisor %d tmp_peak_rate %llu tmp_rate %u", + divisor, + ((USEC_PER_SEC*(u64)bfqd->peak_rate)>>BFQ_RATE_SHIFT), + (u32)((USEC_PER_SEC*(u64)rate)>>BFQ_RATE_SHIFT)); + + BUG_ON(bfqd->peak_rate == 0); + BUG_ON(bfqd->peak_rate > 20<peak_rate += rate; + update_thr_responsiveness_params(bfqd); + BUG_ON(bfqd->peak_rate > 20<peak_rate_samples == 0) { /* first dispatch */ + bfq_log(bfqd, + "update_peak_rate: goto reset, samples %d", + bfqd->peak_rate_samples) ; + bfq_reset_rate_computation(bfqd, rq); + goto update_last_values; /* will add one sample */ + } + + /* + * Device idle for very long: the observation interval lasting + * up to this dispatch cannot be a valid observation interval + * for computing a new peak rate (similarly to the late- + * completion event in bfq_completed_request()). Go to + * update_rate_and_reset to have the following three steps + * taken: + * - close the observation interval at the last (previous) + * request dispatch or completion + * - compute rate, if possible, for that observation interval + * - start a new observation interval with this dispatch + */ + if (now_ns - bfqd->last_dispatch > 100*NSEC_PER_MSEC && + bfqd->rq_in_driver == 0) { + bfq_log(bfqd, +"update_peak_rate: jumping to updating&resetting delta_last %lluus samples %d", + (now_ns - bfqd->last_dispatch)>>10, + bfqd->peak_rate_samples) ; + goto update_rate_and_reset; + } + + /* Update sampling information */ + bfqd->peak_rate_samples++; + + if ((bfqd->rq_in_driver > 0 || + now_ns - bfqd->last_completion < BFQ_MIN_TT) + && get_sdist(bfqd->last_position, rq) < BFQQ_SEEK_THR) + bfqd->sequential_samples++; + + bfqd->tot_sectors_dispatched += blk_rq_sectors(rq); + + /* Reset max observed rq size every 32 dispatches */ + if (likely(bfqd->peak_rate_samples % 32)) + bfqd->last_rq_max_size = + max_t(u32, blk_rq_sectors(rq), bfqd->last_rq_max_size); + else + bfqd->last_rq_max_size = blk_rq_sectors(rq); + + bfqd->delta_from_first = now_ns - bfqd->first_dispatch; + + bfq_log(bfqd, + "update_peak_rate: added samples %u/%u tot_sects %llu delta_first %lluus", + bfqd->peak_rate_samples, bfqd->sequential_samples, + bfqd->tot_sectors_dispatched, + bfqd->delta_from_first>>10); + + /* Target observation interval not yet reached, go on sampling */ + if (bfqd->delta_from_first < BFQ_RATE_REF_INTERVAL) + goto update_last_values; + +update_rate_and_reset: + bfq_update_rate_reset(bfqd, rq); +update_last_values: + bfqd->last_position = blk_rq_pos(rq) + blk_rq_sectors(rq); + bfqd->last_dispatch = now_ns; + + bfq_log(bfqd, + "update_peak_rate: delta_first %lluus last_pos %llu peak_rate %llu", + (now_ns - bfqd->first_dispatch)>>10, + (unsigned long long) bfqd->last_position, + ((USEC_PER_SEC*(u64)bfqd->peak_rate)>>BFQ_RATE_SHIFT)); + bfq_log(bfqd, + "update_peak_rate: samples at end %d", bfqd->peak_rate_samples); +} + +/* + * Remove request from internal lists. + */ +static void bfq_dispatch_remove(struct request_queue *q, struct request *rq) +{ + struct bfq_queue *bfqq = RQ_BFQQ(rq); + + /* + * For consistency, the next instruction should have been + * executed after removing the request from the queue and + * dispatching it. We execute instead this instruction before + * bfq_remove_request() (and hence introduce a temporary + * inconsistency), for efficiency. In fact, should this + * dispatch occur for a non in-service bfqq, this anticipated + * increment prevents two counters related to bfqq->dispatched + * from risking to be, first, uselessly decremented, and then + * incremented again when the (new) value of bfqq->dispatched + * happens to be taken into account. + */ + bfqq->dispatched++; + bfq_update_peak_rate(q->elevator->elevator_data, rq); + + bfq_remove_request(q, rq); +} + +static void __bfq_bfqq_expire(struct bfq_data *bfqd, struct bfq_queue *bfqq) +{ + BUG_ON(bfqq != bfqd->in_service_queue); + + /* + * If this bfqq is shared between multiple processes, check + * to make sure that those processes are still issuing I/Os + * within the mean seek distance. If not, it may be time to + * break the queues apart again. + */ + if (bfq_bfqq_coop(bfqq) && BFQQ_SEEKY(bfqq)) + bfq_mark_bfqq_split_coop(bfqq); + + if (RB_EMPTY_ROOT(&bfqq->sort_list)) { + if (bfqq->dispatched == 0) + /* + * Overloading budget_timeout field to store + * the time at which the queue remains with no + * backlog and no outstanding request; used by + * the weight-raising mechanism. + */ + bfqq->budget_timeout = jiffies; + + bfq_del_bfqq_busy(bfqd, bfqq, true); + } else { + bfq_requeue_bfqq(bfqd, bfqq, true); + /* + * Resort priority tree of potential close cooperators. + */ + bfq_pos_tree_add_move(bfqd, bfqq); + } + + /* + * All in-service entities must have been properly deactivated + * or requeued before executing the next function, which + * resets all in-service entites as no more in service. + */ + __bfq_bfqd_reset_in_service(bfqd); +} + +/** + * __bfq_bfqq_recalc_budget - try to adapt the budget to the @bfqq behavior. + * @bfqd: device data. + * @bfqq: queue to update. + * @reason: reason for expiration. + * + * Handle the feedback on @bfqq budget at queue expiration. + * See the body for detailed comments. + */ +static void __bfq_bfqq_recalc_budget(struct bfq_data *bfqd, + struct bfq_queue *bfqq, + enum bfqq_expiration reason) +{ + struct request *next_rq; + int budget, min_budget; + + BUG_ON(bfqq != bfqd->in_service_queue); + + min_budget = bfq_min_budget(bfqd); + + if (bfqq->wr_coeff == 1) + budget = bfqq->max_budget; + else /* + * Use a constant, low budget for weight-raised queues, + * to help achieve a low latency. Keep it slightly higher + * than the minimum possible budget, to cause a little + * bit fewer expirations. + */ + budget = 2 * min_budget; + + bfq_log_bfqq(bfqd, bfqq, "recalc_budg: last budg %d, budg left %d", + bfqq->entity.budget, bfq_bfqq_budget_left(bfqq)); + bfq_log_bfqq(bfqd, bfqq, "recalc_budg: last max_budg %d, min budg %d", + budget, bfq_min_budget(bfqd)); + bfq_log_bfqq(bfqd, bfqq, "recalc_budg: sync %d, seeky %d", + bfq_bfqq_sync(bfqq), BFQQ_SEEKY(bfqd->in_service_queue)); + + if (bfq_bfqq_sync(bfqq) && bfqq->wr_coeff == 1) { + switch (reason) { + /* + * Caveat: in all the following cases we trade latency + * for throughput. + */ + case BFQ_BFQQ_TOO_IDLE: + /* + * This is the only case where we may reduce + * the budget: if there is no request of the + * process still waiting for completion, then + * we assume (tentatively) that the timer has + * expired because the batch of requests of + * the process could have been served with a + * smaller budget. Hence, betting that + * process will behave in the same way when it + * becomes backlogged again, we reduce its + * next budget. As long as we guess right, + * this budget cut reduces the latency + * experienced by the process. + * + * However, if there are still outstanding + * requests, then the process may have not yet + * issued its next request just because it is + * still waiting for the completion of some of + * the still outstanding ones. So in this + * subcase we do not reduce its budget, on the + * contrary we increase it to possibly boost + * the throughput, as discussed in the + * comments to the BUDGET_TIMEOUT case. + */ + if (bfqq->dispatched > 0) /* still outstanding reqs */ + budget = min(budget * 2, bfqd->bfq_max_budget); + else { + if (budget > 5 * min_budget) + budget -= 4 * min_budget; + else + budget = min_budget; + } + break; + case BFQ_BFQQ_BUDGET_TIMEOUT: + /* + * We double the budget here because it gives + * the chance to boost the throughput if this + * is not a seeky process (and has bumped into + * this timeout because of, e.g., ZBR). + */ + budget = min(budget * 2, bfqd->bfq_max_budget); + break; + case BFQ_BFQQ_BUDGET_EXHAUSTED: + /* + * The process still has backlog, and did not + * let either the budget timeout or the disk + * idling timeout expire. Hence it is not + * seeky, has a short thinktime and may be + * happy with a higher budget too. So + * definitely increase the budget of this good + * candidate to boost the disk throughput. + */ + budget = min(budget * 4, bfqd->bfq_max_budget); + break; + case BFQ_BFQQ_NO_MORE_REQUESTS: + /* + * For queues that expire for this reason, it + * is particularly important to keep the + * budget close to the actual service they + * need. Doing so reduces the timestamp + * misalignment problem described in the + * comments in the body of + * __bfq_activate_entity. In fact, suppose + * that a queue systematically expires for + * BFQ_BFQQ_NO_MORE_REQUESTS and presents a + * new request in time to enjoy timestamp + * back-shifting. The larger the budget of the + * queue is with respect to the service the + * queue actually requests in each service + * slot, the more times the queue can be + * reactivated with the same virtual finish + * time. It follows that, even if this finish + * time is pushed to the system virtual time + * to reduce the consequent timestamp + * misalignment, the queue unjustly enjoys for + * many re-activations a lower finish time + * than all newly activated queues. + * + * The service needed by bfqq is measured + * quite precisely by bfqq->entity.service. + * Since bfqq does not enjoy device idling, + * bfqq->entity.service is equal to the number + * of sectors that the process associated with + * bfqq requested to read/write before waiting + * for request completions, or blocking for + * other reasons. + */ + budget = max_t(int, bfqq->entity.service, min_budget); + break; + default: + return; + } + } else if (!bfq_bfqq_sync(bfqq)) + /* + * Async queues get always the maximum possible + * budget, as for them we do not care about latency + * (in addition, their ability to dispatch is limited + * by the charging factor). + */ + budget = bfqd->bfq_max_budget; + + bfqq->max_budget = budget; + + if (bfqd->budgets_assigned >= bfq_stats_min_budgets && + !bfqd->bfq_user_max_budget) + bfqq->max_budget = min(bfqq->max_budget, bfqd->bfq_max_budget); + + /* + * If there is still backlog, then assign a new budget, making + * sure that it is large enough for the next request. Since + * the finish time of bfqq must be kept in sync with the + * budget, be sure to call __bfq_bfqq_expire() *after* this + * update. + * + * If there is no backlog, then no need to update the budget; + * it will be updated on the arrival of a new request. + */ + next_rq = bfqq->next_rq; + if (next_rq) { + BUG_ON(reason == BFQ_BFQQ_TOO_IDLE || + reason == BFQ_BFQQ_NO_MORE_REQUESTS); + bfqq->entity.budget = max_t(unsigned long, bfqq->max_budget, + bfq_serv_to_charge(next_rq, bfqq)); + BUG_ON(!bfq_bfqq_busy(bfqq)); + BUG_ON(RB_EMPTY_ROOT(&bfqq->sort_list)); + } + + bfq_log_bfqq(bfqd, bfqq, "head sect: %u, new budget %d", + next_rq ? blk_rq_sectors(next_rq) : 0, + bfqq->entity.budget); +} + +/* + * Return true if the process associated with bfqq is "slow". The slow + * flag is used, in addition to the budget timeout, to reduce the + * amount of service provided to seeky processes, and thus reduce + * their chances to lower the throughput. More details in the comments + * on the function bfq_bfqq_expire(). + * + * An important observation is in order: as discussed in the comments + * on the function bfq_update_peak_rate(), with devices with internal + * queues, it is hard if ever possible to know when and for how long + * an I/O request is processed by the device (apart from the trivial + * I/O pattern where a new request is dispatched only after the + * previous one has been completed). This makes it hard to evaluate + * the real rate at which the I/O requests of each bfq_queue are + * served. In fact, for an I/O scheduler like BFQ, serving a + * bfq_queue means just dispatching its requests during its service + * slot (i.e., until the budget of the queue is exhausted, or the + * queue remains idle, or, finally, a timeout fires). But, during the + * service slot of a bfq_queue, around 100 ms at most, the device may + * be even still processing requests of bfq_queues served in previous + * service slots. On the opposite end, the requests of the in-service + * bfq_queue may be completed after the service slot of the queue + * finishes. + * + * Anyway, unless more sophisticated solutions are used + * (where possible), the sum of the sizes of the requests dispatched + * during the service slot of a bfq_queue is probably the only + * approximation available for the service received by the bfq_queue + * during its service slot. And this sum is the quantity used in this + * function to evaluate the I/O speed of a process. + */ +static bool bfq_bfqq_is_slow(struct bfq_data *bfqd, struct bfq_queue *bfqq, + bool compensate, enum bfqq_expiration reason, + unsigned long *delta_ms) +{ + ktime_t delta_ktime; + u32 delta_usecs; + bool slow = BFQQ_SEEKY(bfqq); /* if delta too short, use seekyness */ + + if (!bfq_bfqq_sync(bfqq)) + return false; + + if (compensate) + delta_ktime = bfqd->last_idling_start; + else + delta_ktime = ktime_get(); + delta_ktime = ktime_sub(delta_ktime, bfqd->last_budget_start); + delta_usecs = ktime_to_us(delta_ktime); + + /* don't use too short time intervals */ + if (delta_usecs < 1000) { + if (blk_queue_nonrot(bfqd->queue)) + /* + * give same worst-case guarantees as idling + * for seeky + */ + *delta_ms = BFQ_MIN_TT / NSEC_PER_MSEC; + else /* charge at least one seek */ + *delta_ms = bfq_slice_idle / NSEC_PER_MSEC; + + bfq_log(bfqd, "bfq_bfqq_is_slow: too short %u", delta_usecs); + + return slow; + } + + *delta_ms = delta_usecs / USEC_PER_MSEC; + + /* + * Use only long (> 20ms) intervals to filter out excessive + * spikes in service rate estimation. + */ + if (delta_usecs > 20000) { + /* + * Caveat for rotational devices: processes doing I/O + * in the slower disk zones tend to be slow(er) even + * if not seeky. In this respect, the estimated peak + * rate is likely to be an average over the disk + * surface. Accordingly, to not be too harsh with + * unlucky processes, a process is deemed slow only if + * its rate has been lower than half of the estimated + * peak rate. + */ + slow = bfqq->entity.service < bfqd->bfq_max_budget / 2; + bfq_log(bfqd, "bfq_bfqq_is_slow: relative rate %d/%d", + bfqq->entity.service, bfqd->bfq_max_budget); + } + + bfq_log_bfqq(bfqd, bfqq, "bfq_bfqq_is_slow: slow %d", slow); + + return slow; +} + +/* + * To be deemed as soft real-time, an application must meet two + * requirements. First, the application must not require an average + * bandwidth higher than the approximate bandwidth required to playback or + * record a compressed high-definition video. + * The next function is invoked on the completion of the last request of a + * batch, to compute the next-start time instant, soft_rt_next_start, such + * that, if the next request of the application does not arrive before + * soft_rt_next_start, then the above requirement on the bandwidth is met. + * + * The second requirement is that the request pattern of the application is + * isochronous, i.e., that, after issuing a request or a batch of requests, + * the application stops issuing new requests until all its pending requests + * have been completed. After that, the application may issue a new batch, + * and so on. + * For this reason the next function is invoked to compute + * soft_rt_next_start only for applications that meet this requirement, + * whereas soft_rt_next_start is set to infinity for applications that do + * not. + * + * Unfortunately, even a greedy application may happen to behave in an + * isochronous way if the CPU load is high. In fact, the application may + * stop issuing requests while the CPUs are busy serving other processes, + * then restart, then stop again for a while, and so on. In addition, if + * the disk achieves a low enough throughput with the request pattern + * issued by the application (e.g., because the request pattern is random + * and/or the device is slow), then the application may meet the above + * bandwidth requirement too. To prevent such a greedy application to be + * deemed as soft real-time, a further rule is used in the computation of + * soft_rt_next_start: soft_rt_next_start must be higher than the current + * time plus the maximum time for which the arrival of a request is waited + * for when a sync queue becomes idle, namely bfqd->bfq_slice_idle. + * This filters out greedy applications, as the latter issue instead their + * next request as soon as possible after the last one has been completed + * (in contrast, when a batch of requests is completed, a soft real-time + * application spends some time processing data). + * + * Unfortunately, the last filter may easily generate false positives if + * only bfqd->bfq_slice_idle is used as a reference time interval and one + * or both the following cases occur: + * 1) HZ is so low that the duration of a jiffy is comparable to or higher + * than bfqd->bfq_slice_idle. This happens, e.g., on slow devices with + * HZ=100. + * 2) jiffies, instead of increasing at a constant rate, may stop increasing + * for a while, then suddenly 'jump' by several units to recover the lost + * increments. This seems to happen, e.g., inside virtual machines. + * To address this issue, we do not use as a reference time interval just + * bfqd->bfq_slice_idle, but bfqd->bfq_slice_idle plus a few jiffies. In + * particular we add the minimum number of jiffies for which the filter + * seems to be quite precise also in embedded systems and KVM/QEMU virtual + * machines. + */ +static unsigned long bfq_bfqq_softrt_next_start(struct bfq_data *bfqd, + struct bfq_queue *bfqq) +{ + bfq_log_bfqq(bfqd, bfqq, +"softrt_next_start: service_blkg %lu soft_rate %u sects/sec interval %u", + bfqq->service_from_backlogged, + bfqd->bfq_wr_max_softrt_rate, + jiffies_to_msecs(HZ * bfqq->service_from_backlogged / + bfqd->bfq_wr_max_softrt_rate)); + + return max(bfqq->last_idle_bklogged + + HZ * bfqq->service_from_backlogged / + bfqd->bfq_wr_max_softrt_rate, + jiffies + nsecs_to_jiffies(bfqq->bfqd->bfq_slice_idle) + 4); +} + +/** + * bfq_bfqq_expire - expire a queue. + * @bfqd: device owning the queue. + * @bfqq: the queue to expire. + * @compensate: if true, compensate for the time spent idling. + * @reason: the reason causing the expiration. + * + * If the process associated with bfqq does slow I/O (e.g., because it + * issues random requests), we charge bfqq with the time it has been + * in service instead of the service it has received (see + * bfq_bfqq_charge_time for details on how this goal is achieved). As + * a consequence, bfqq will typically get higher timestamps upon + * reactivation, and hence it will be rescheduled as if it had + * received more service than what it has actually received. In the + * end, bfqq receives less service in proportion to how slowly its + * associated process consumes its budgets (and hence how seriously it + * tends to lower the throughput). In addition, this time-charging + * strategy guarantees time fairness among slow processes. In + * contrast, if the process associated with bfqq is not slow, we + * charge bfqq exactly with the service it has received. + * + * Charging time to the first type of queues and the exact service to + * the other has the effect of using the WF2Q+ policy to schedule the + * former on a timeslice basis, without violating service domain + * guarantees among the latter. + */ +static void bfq_bfqq_expire(struct bfq_data *bfqd, + struct bfq_queue *bfqq, + bool compensate, + enum bfqq_expiration reason) +{ + bool slow; + unsigned long delta = 0; + struct bfq_entity *entity = &bfqq->entity; + int ref; + + BUG_ON(bfqq != bfqd->in_service_queue); + + /* + * Check whether the process is slow (see bfq_bfqq_is_slow). + */ + slow = bfq_bfqq_is_slow(bfqd, bfqq, compensate, reason, &delta); + + /* + * Increase service_from_backlogged before next statement, + * because the possible next invocation of + * bfq_bfqq_charge_time would likely inflate + * entity->service. In contrast, service_from_backlogged must + * contain real service, to enable the soft real-time + * heuristic to correctly compute the bandwidth consumed by + * bfqq. + */ + bfqq->service_from_backlogged += entity->service; + + /* + * As above explained, charge slow (typically seeky) and + * timed-out queues with the time and not the service + * received, to favor sequential workloads. + * + * Processes doing I/O in the slower disk zones will tend to + * be slow(er) even if not seeky. Therefore, since the + * estimated peak rate is actually an average over the disk + * surface, these processes may timeout just for bad luck. To + * avoid punishing them, do not charge time to processes that + * succeeded in consuming at least 2/3 of their budget. This + * allows BFQ to preserve enough elasticity to still perform + * bandwidth, and not time, distribution with little unlucky + * or quasi-sequential processes. + */ + if (bfqq->wr_coeff == 1 && + (slow || + (reason == BFQ_BFQQ_BUDGET_TIMEOUT && + bfq_bfqq_budget_left(bfqq) >= entity->budget / 3))) + bfq_bfqq_charge_time(bfqd, bfqq, delta); + + BUG_ON(bfqq->entity.budget < bfqq->entity.service); + + if (reason == BFQ_BFQQ_TOO_IDLE && + entity->service <= 2 * entity->budget / 10) + bfq_clear_bfqq_IO_bound(bfqq); + + if (bfqd->low_latency && bfqq->wr_coeff == 1) + bfqq->last_wr_start_finish = jiffies; + + if (bfqd->low_latency && bfqd->bfq_wr_max_softrt_rate > 0 && + RB_EMPTY_ROOT(&bfqq->sort_list)) { + /* + * If we get here, and there are no outstanding + * requests, then the request pattern is isochronous + * (see the comments on the function + * bfq_bfqq_softrt_next_start()). Thus we can compute + * soft_rt_next_start. If, instead, the queue still + * has outstanding requests, then we have to wait for + * the completion of all the outstanding requests to + * discover whether the request pattern is actually + * isochronous. + */ + BUG_ON(bfqd->busy_queues < 1); + if (bfqq->dispatched == 0) { + bfqq->soft_rt_next_start = + bfq_bfqq_softrt_next_start(bfqd, bfqq); + bfq_log_bfqq(bfqd, bfqq, "new soft_rt_next %lu", + bfqq->soft_rt_next_start); + } else { + /* + * The application is still waiting for the + * completion of one or more requests: + * prevent it from possibly being incorrectly + * deemed as soft real-time by setting its + * soft_rt_next_start to infinity. In fact, + * without this assignment, the application + * would be incorrectly deemed as soft + * real-time if: + * 1) it issued a new request before the + * completion of all its in-flight + * requests, and + * 2) at that time, its soft_rt_next_start + * happened to be in the past. + */ + bfqq->soft_rt_next_start = + bfq_greatest_from_now(); + /* + * Schedule an update of soft_rt_next_start to when + * the task may be discovered to be isochronous. + */ + bfq_mark_bfqq_softrt_update(bfqq); + } + } + + bfq_log_bfqq(bfqd, bfqq, + "expire (%d, slow %d, num_disp %d, short_ttime %d, weight %d)", + reason, slow, bfqq->dispatched, + bfq_bfqq_has_short_ttime(bfqq), entity->weight); + + /* + * Increase, decrease or leave budget unchanged according to + * reason. + */ + BUG_ON(bfqq->entity.budget < bfqq->entity.service); + __bfq_bfqq_recalc_budget(bfqd, bfqq, reason); + BUG_ON(bfqq->next_rq == NULL && + bfqq->entity.budget < bfqq->entity.service); + ref = bfqq->ref; + __bfq_bfqq_expire(bfqd, bfqq); + + BUG_ON(ref > 1 && + !bfq_bfqq_busy(bfqq) && reason == BFQ_BFQQ_BUDGET_EXHAUSTED && + !bfq_class_idle(bfqq)); + + /* mark bfqq as waiting a request only if a bic still points to it */ + if (ref > 1 && !bfq_bfqq_busy(bfqq) && + reason != BFQ_BFQQ_BUDGET_TIMEOUT && + reason != BFQ_BFQQ_BUDGET_EXHAUSTED) + bfq_mark_bfqq_non_blocking_wait_rq(bfqq); +} + +/* + * Budget timeout is not implemented through a dedicated timer, but + * just checked on request arrivals and completions, as well as on + * idle timer expirations. + */ +static bool bfq_bfqq_budget_timeout(struct bfq_queue *bfqq) +{ + return time_is_before_eq_jiffies(bfqq->budget_timeout); +} + +/* + * If we expire a queue that is actively waiting (i.e., with the + * device idled) for the arrival of a new request, then we may incur + * the timestamp misalignment problem described in the body of the + * function __bfq_activate_entity. Hence we return true only if this + * condition does not hold, or if the queue is slow enough to deserve + * only to be kicked off for preserving a high throughput. + */ +static bool bfq_may_expire_for_budg_timeout(struct bfq_queue *bfqq) +{ + bfq_log_bfqq(bfqq->bfqd, bfqq, + "may_budget_timeout: wait_request %d left %d timeout %d", + bfq_bfqq_wait_request(bfqq), + bfq_bfqq_budget_left(bfqq) >= bfqq->entity.budget / 3, + bfq_bfqq_budget_timeout(bfqq)); + + return (!bfq_bfqq_wait_request(bfqq) || + bfq_bfqq_budget_left(bfqq) >= bfqq->entity.budget / 3) + && + bfq_bfqq_budget_timeout(bfqq); +} + +/* + * For a queue that becomes empty, device idling is allowed only if + * this function returns true for that queue. As a consequence, since + * device idling plays a critical role for both throughput boosting + * and service guarantees, the return value of this function plays a + * critical role as well. + * + * In a nutshell, this function returns true only if idling is + * beneficial for throughput or, even if detrimental for throughput, + * idling is however necessary to preserve service guarantees (low + * latency, desired throughput distribution, ...). In particular, on + * NCQ-capable devices, this function tries to return false, so as to + * help keep the drives' internal queues full, whenever this helps the + * device boost the throughput without causing any service-guarantee + * issue. + * + * In more detail, the return value of this function is obtained by, + * first, computing a number of boolean variables that take into + * account throughput and service-guarantee issues, and, then, + * combining these variables in a logical expression. Most of the + * issues taken into account are not trivial. We discuss these issues + * while introducing the variables. + */ +static bool bfq_bfqq_may_idle(struct bfq_queue *bfqq) +{ + struct bfq_data *bfqd = bfqq->bfqd; + bool rot_without_queueing = + !blk_queue_nonrot(bfqd->queue) && !bfqd->hw_tag, + bfqq_sequential_and_IO_bound, + idling_boosts_thr, idling_boosts_thr_without_issues, + idling_needed_for_service_guarantees, + asymmetric_scenario; + + if (bfqd->strict_guarantees) + return true; + + /* + * Idling is performed only if slice_idle > 0. In addition, we + * do not idle if + * (a) bfqq is async + * (b) bfqq is in the idle io prio class: in this case we do + * not idle because we want to minimize the bandwidth that + * queues in this class can steal to higher-priority queues + */ + if (bfqd->bfq_slice_idle == 0 || !bfq_bfqq_sync(bfqq) || + bfq_class_idle(bfqq)) + return false; + + bfqq_sequential_and_IO_bound = !BFQQ_SEEKY(bfqq) && + bfq_bfqq_IO_bound(bfqq) && bfq_bfqq_has_short_ttime(bfqq); + /* + * The next variable takes into account the cases where idling + * boosts the throughput. + * + * The value of the variable is computed considering, first, that + * idling is virtually always beneficial for the throughput if: + * (a) the device is not NCQ-capable and rotational, or + * (b) regardless of the presence of NCQ, the device is rotational and + * the request pattern for bfqq is I/O-bound and sequential, or + * (c) regardless of whether it is rotational, the device is + * not NCQ-capable and the request pattern for bfqq is + * I/O-bound and sequential. + * + * Secondly, and in contrast to the above item (b), idling an + * NCQ-capable flash-based device would not boost the + * throughput even with sequential I/O; rather it would lower + * the throughput in proportion to how fast the device + * is. Accordingly, the next variable is true if any of the + * above conditions (a), (b) or (c) is true, and, in + * particular, happens to be false if bfqd is an NCQ-capable + * flash-based device. + */ + idling_boosts_thr = rot_without_queueing || + ((!blk_queue_nonrot(bfqd->queue) || !bfqd->hw_tag) && + bfqq_sequential_and_IO_bound); + + /* + * The value of the next variable, + * idling_boosts_thr_without_issues, is equal to that of + * idling_boosts_thr, unless a special case holds. In this + * special case, described below, idling may cause problems to + * weight-raised queues. + * + * When the request pool is saturated (e.g., in the presence + * of write hogs), if the processes associated with + * non-weight-raised queues ask for requests at a lower rate, + * then processes associated with weight-raised queues have a + * higher probability to get a request from the pool + * immediately (or at least soon) when they need one. Thus + * they have a higher probability to actually get a fraction + * of the device throughput proportional to their high + * weight. This is especially true with NCQ-capable drives, + * which enqueue several requests in advance, and further + * reorder internally-queued requests. + * + * For this reason, we force to false the value of + * idling_boosts_thr_without_issues if there are weight-raised + * busy queues. In this case, and if bfqq is not weight-raised, + * this guarantees that the device is not idled for bfqq (if, + * instead, bfqq is weight-raised, then idling will be + * guaranteed by another variable, see below). Combined with + * the timestamping rules of BFQ (see [1] for details), this + * behavior causes bfqq, and hence any sync non-weight-raised + * queue, to get a lower number of requests served, and thus + * to ask for a lower number of requests from the request + * pool, before the busy weight-raised queues get served + * again. This often mitigates starvation problems in the + * presence of heavy write workloads and NCQ, thereby + * guaranteeing a higher application and system responsiveness + * in these hostile scenarios. + */ + idling_boosts_thr_without_issues = idling_boosts_thr && + bfqd->wr_busy_queues == 0; + + /* + * There is then a case where idling must be performed not + * for throughput concerns, but to preserve service + * guarantees. + * + * To introduce this case, we can note that allowing the drive + * to enqueue more than one request at a time, and hence + * delegating de facto final scheduling decisions to the + * drive's internal scheduler, entails loss of control on the + * actual request service order. In particular, the critical + * situation is when requests from different processes happen + * to be present, at the same time, in the internal queue(s) + * of the drive. In such a situation, the drive, by deciding + * the service order of the internally-queued requests, does + * determine also the actual throughput distribution among + * these processes. But the drive typically has no notion or + * concern about per-process throughput distribution, and + * makes its decisions only on a per-request basis. Therefore, + * the service distribution enforced by the drive's internal + * scheduler is likely to coincide with the desired + * device-throughput distribution only in a completely + * symmetric scenario where: + * (i) each of these processes must get the same throughput as + * the others; + * (ii) all these processes have the same I/O pattern + * (either sequential or random). + * In fact, in such a scenario, the drive will tend to treat + * the requests of each of these processes in about the same + * way as the requests of the others, and thus to provide + * each of these processes with about the same throughput + * (which is exactly the desired throughput distribution). In + * contrast, in any asymmetric scenario, device idling is + * certainly needed to guarantee that bfqq receives its + * assigned fraction of the device throughput (see [1] for + * details). + * + * We address this issue by controlling, actually, only the + * symmetry sub-condition (i), i.e., provided that + * sub-condition (i) holds, idling is not performed, + * regardless of whether sub-condition (ii) holds. In other + * words, only if sub-condition (i) holds, then idling is + * allowed, and the device tends to be prevented from queueing + * many requests, possibly of several processes. The reason + * for not controlling also sub-condition (ii) is that we + * exploit preemption to preserve guarantees in case of + * symmetric scenarios, even if (ii) does not hold, as + * explained in the next two paragraphs. + * + * Even if a queue, say Q, is expired when it remains idle, Q + * can still preempt the new in-service queue if the next + * request of Q arrives soon (see the comments on + * bfq_bfqq_update_budg_for_activation). If all queues and + * groups have the same weight, this form of preemption, + * combined with the hole-recovery heuristic described in the + * comments on function bfq_bfqq_update_budg_for_activation, + * are enough to preserve a correct bandwidth distribution in + * the mid term, even without idling. In fact, even if not + * idling allows the internal queues of the device to contain + * many requests, and thus to reorder requests, we can rather + * safely assume that the internal scheduler still preserves a + * minimum of mid-term fairness. The motivation for using + * preemption instead of idling is that, by not idling, + * service guarantees are preserved without minimally + * sacrificing throughput. In other words, both a high + * throughput and its desired distribution are obtained. + * + * More precisely, this preemption-based, idleless approach + * provides fairness in terms of IOPS, and not sectors per + * second. This can be seen with a simple example. Suppose + * that there are two queues with the same weight, but that + * the first queue receives requests of 8 sectors, while the + * second queue receives requests of 1024 sectors. In + * addition, suppose that each of the two queues contains at + * most one request at a time, which implies that each queue + * always remains idle after it is served. Finally, after + * remaining idle, each queue receives very quickly a new + * request. It follows that the two queues are served + * alternatively, preempting each other if needed. This + * implies that, although both queues have the same weight, + * the queue with large requests receives a service that is + * 1024/8 times as high as the service received by the other + * queue. + * + * On the other hand, device idling is performed, and thus + * pure sector-domain guarantees are provided, for the + * following queues, which are likely to need stronger + * throughput guarantees: weight-raised queues, and queues + * with a higher weight than other queues. When such queues + * are active, sub-condition (i) is false, which triggers + * device idling. + * + * According to the above considerations, the next variable is + * true (only) if sub-condition (i) holds. To compute the + * value of this variable, we not only use the return value of + * the function bfq_symmetric_scenario(), but also check + * whether bfqq is being weight-raised, because + * bfq_symmetric_scenario() does not take into account also + * weight-raised queues (see comments on + * bfq_weights_tree_add()). + * + * As a side note, it is worth considering that the above + * device-idling countermeasures may however fail in the + * following unlucky scenario: if idling is (correctly) + * disabled in a time period during which all symmetry + * sub-conditions hold, and hence the device is allowed to + * enqueue many requests, but at some later point in time some + * sub-condition stops to hold, then it may become impossible + * to let requests be served in the desired order until all + * the requests already queued in the device have been served. + */ + asymmetric_scenario = bfqq->wr_coeff > 1 || + !bfq_symmetric_scenario(bfqd); + + /* + * Finally, there is a case where maximizing throughput is the + * best choice even if it may cause unfairness toward + * bfqq. Such a case is when bfqq became active in a burst of + * queue activations. Queues that became active during a large + * burst benefit only from throughput, as discussed in the + * comments on bfq_handle_burst. Thus, if bfqq became active + * in a burst and not idling the device maximizes throughput, + * then the device must no be idled, because not idling the + * device provides bfqq and all other queues in the burst with + * maximum benefit. Combining this and the above case, we can + * now establish when idling is actually needed to preserve + * service guarantees. + */ + idling_needed_for_service_guarantees = + asymmetric_scenario && !bfq_bfqq_in_large_burst(bfqq); + + /* + * We have now all the components we need to compute the + * return value of the function, which is true only if idling + * either boosts the throughput (without issues), or is + * necessary to preserve service guarantees. + */ + bfq_log_bfqq(bfqd, bfqq, "may_idle: sync %d idling_boosts_thr %d", + bfq_bfqq_sync(bfqq), idling_boosts_thr); + + bfq_log_bfqq(bfqd, bfqq, + "may_idle: wr_busy %d boosts %d IO-bound %d guar %d", + bfqd->wr_busy_queues, + idling_boosts_thr_without_issues, + bfq_bfqq_IO_bound(bfqq), + idling_needed_for_service_guarantees); + + return idling_boosts_thr_without_issues || + idling_needed_for_service_guarantees; +} + +/* + * If the in-service queue is empty but the function bfq_bfqq_may_idle + * returns true, then: + * 1) the queue must remain in service and cannot be expired, and + * 2) the device must be idled to wait for the possible arrival of a new + * request for the queue. + * See the comments on the function bfq_bfqq_may_idle for the reasons + * why performing device idling is the best choice to boost the throughput + * and preserve service guarantees when bfq_bfqq_may_idle itself + * returns true. + */ +static bool bfq_bfqq_must_idle(struct bfq_queue *bfqq) +{ + return RB_EMPTY_ROOT(&bfqq->sort_list) && bfq_bfqq_may_idle(bfqq); +} + +/* + * Select a queue for service. If we have a current queue in service, + * check whether to continue servicing it, or retrieve and set a new one. + */ +static struct bfq_queue *bfq_select_queue(struct bfq_data *bfqd) +{ + struct bfq_queue *bfqq; + struct request *next_rq; + enum bfqq_expiration reason = BFQ_BFQQ_BUDGET_TIMEOUT; + + bfqq = bfqd->in_service_queue; + if (!bfqq) + goto new_queue; + + bfq_log_bfqq(bfqd, bfqq, "select_queue: already in-service queue"); + + if (bfq_may_expire_for_budg_timeout(bfqq) && + !bfq_bfqq_wait_request(bfqq) && + !bfq_bfqq_must_idle(bfqq)) + goto expire; + +check_queue: + /* + * This loop is rarely executed more than once. Even when it + * happens, it is much more convenient to re-execute this loop + * than to return NULL and trigger a new dispatch to get a + * request served. + */ + next_rq = bfqq->next_rq; + /* + * If bfqq has requests queued and it has enough budget left to + * serve them, keep the queue, otherwise expire it. + */ + if (next_rq) { + BUG_ON(RB_EMPTY_ROOT(&bfqq->sort_list)); + + if (bfq_serv_to_charge(next_rq, bfqq) > + bfq_bfqq_budget_left(bfqq)) { + /* + * Expire the queue for budget exhaustion, + * which makes sure that the next budget is + * enough to serve the next request, even if + * it comes from the fifo expired path. + */ + reason = BFQ_BFQQ_BUDGET_EXHAUSTED; + goto expire; + } else { + /* + * The idle timer may be pending because we may + * not disable disk idling even when a new request + * arrives. + */ + if (bfq_bfqq_wait_request(bfqq)) { + /* + * If we get here: 1) at least a new request + * has arrived but we have not disabled the + * timer because the request was too small, + * 2) then the block layer has unplugged + * the device, causing the dispatch to be + * invoked. + * + * Since the device is unplugged, now the + * requests are probably large enough to + * provide a reasonable throughput. + * So we disable idling. + */ + bfq_clear_bfqq_wait_request(bfqq); + hrtimer_try_to_cancel(&bfqd->idle_slice_timer); + bfqg_stats_update_idle_time(bfqq_group(bfqq)); + } + goto keep_queue; + } + } + + /* + * No requests pending. However, if the in-service queue is idling + * for a new request, or has requests waiting for a completion and + * may idle after their completion, then keep it anyway. + */ + if (bfq_bfqq_wait_request(bfqq) || + (bfqq->dispatched != 0 && bfq_bfqq_may_idle(bfqq))) { + bfqq = NULL; + goto keep_queue; + } + + reason = BFQ_BFQQ_NO_MORE_REQUESTS; +expire: + bfq_bfqq_expire(bfqd, bfqq, false, reason); +new_queue: + bfqq = bfq_set_in_service_queue(bfqd); + if (bfqq) { + bfq_log_bfqq(bfqd, bfqq, "select_queue: checking new queue"); + goto check_queue; + } +keep_queue: + if (bfqq) + bfq_log_bfqq(bfqd, bfqq, "select_queue: returned this queue"); + else + bfq_log(bfqd, "select_queue: no queue returned"); + + return bfqq; +} + +static void bfq_update_wr_data(struct bfq_data *bfqd, struct bfq_queue *bfqq) +{ + struct bfq_entity *entity = &bfqq->entity; + + if (bfqq->wr_coeff > 1) { /* queue is being weight-raised */ + BUG_ON(bfqq->wr_cur_max_time == bfqd->bfq_wr_rt_max_time && + time_is_after_jiffies(bfqq->last_wr_start_finish)); + + bfq_log_bfqq(bfqd, bfqq, + "raising period dur %u/%u msec, old coeff %u, w %d(%d)", + jiffies_to_msecs(jiffies - bfqq->last_wr_start_finish), + jiffies_to_msecs(bfqq->wr_cur_max_time), + bfqq->wr_coeff, + bfqq->entity.weight, bfqq->entity.orig_weight); + + BUG_ON(bfqq != bfqd->in_service_queue && entity->weight != + entity->orig_weight * bfqq->wr_coeff); + if (entity->prio_changed) + bfq_log_bfqq(bfqd, bfqq, "WARN: pending prio change"); + + /* + * If the queue was activated in a burst, or too much + * time has elapsed from the beginning of this + * weight-raising period, then end weight raising. + */ + if (bfq_bfqq_in_large_burst(bfqq)) + bfq_bfqq_end_wr(bfqq); + else if (time_is_before_jiffies(bfqq->last_wr_start_finish + + bfqq->wr_cur_max_time)) { + if (bfqq->wr_cur_max_time != bfqd->bfq_wr_rt_max_time || + time_is_before_jiffies(bfqq->wr_start_at_switch_to_srt + + bfq_wr_duration(bfqd))) + bfq_bfqq_end_wr(bfqq); + else { + /* switch back to interactive wr */ + bfqq->wr_coeff = bfqd->bfq_wr_coeff; + bfqq->wr_cur_max_time = bfq_wr_duration(bfqd); + bfqq->last_wr_start_finish = + bfqq->wr_start_at_switch_to_srt; + BUG_ON(time_is_after_jiffies( + bfqq->last_wr_start_finish)); + bfqq->entity.prio_changed = 1; + bfq_log_bfqq(bfqd, bfqq, + "back to interactive wr"); + } + } + } + /* + * To improve latency (for this or other queues), immediately + * update weight both if it must be raised and if it must be + * lowered. Since, entity may be on some active tree here, and + * might have a pending change of its ioprio class, invoke + * next function with the last parameter unset (see the + * comments on the function). + */ + if ((entity->weight > entity->orig_weight) != (bfqq->wr_coeff > 1)) + __bfq_entity_update_weight_prio(bfq_entity_service_tree(entity), + entity, false); +} + +/* + * Dispatch next request from bfqq. + */ +static struct request *bfq_dispatch_rq_from_bfqq(struct bfq_data *bfqd, + struct bfq_queue *bfqq) +{ + struct request *rq = bfqq->next_rq; + unsigned long service_to_charge; + + BUG_ON(RB_EMPTY_ROOT(&bfqq->sort_list)); + BUG_ON(!rq); + service_to_charge = bfq_serv_to_charge(rq, bfqq); + + BUG_ON(service_to_charge > bfq_bfqq_budget_left(bfqq)); + + BUG_ON(bfqq->entity.budget < bfqq->entity.service); + + bfq_bfqq_served(bfqq, service_to_charge); + + BUG_ON(bfqq->entity.budget < bfqq->entity.service); + + bfq_dispatch_remove(bfqd->queue, rq); + + /* + * If weight raising has to terminate for bfqq, then next + * function causes an immediate update of bfqq's weight, + * without waiting for next activation. As a consequence, on + * expiration, bfqq will be timestamped as if has never been + * weight-raised during this service slot, even if it has + * received part or even most of the service as a + * weight-raised queue. This inflates bfqq's timestamps, which + * is beneficial, as bfqq is then more willing to leave the + * device immediately to possible other weight-raised queues. + */ + bfq_update_wr_data(bfqd, bfqq); + + bfq_log_bfqq(bfqd, bfqq, + "dispatched %u sec req (%llu), budg left %d, new disp_nr %d", + blk_rq_sectors(rq), + (unsigned long long) blk_rq_pos(rq), + bfq_bfqq_budget_left(bfqq), + bfqq->dispatched); + + /* + * Expire bfqq, pretending that its budget expired, if bfqq + * belongs to CLASS_IDLE and other queues are waiting for + * service. + */ + if (bfqd->busy_queues > 1 && bfq_class_idle(bfqq)) + goto expire; + + return rq; + +expire: + bfq_bfqq_expire(bfqd, bfqq, false, BFQ_BFQQ_BUDGET_EXHAUSTED); + return rq; +} + +static bool bfq_has_work(struct blk_mq_hw_ctx *hctx) +{ + struct bfq_data *bfqd = hctx->queue->elevator->elevator_data; + + bfq_log(bfqd, "has_work, dispatch_non_empty %d busy_queues %d", + !list_empty_careful(&bfqd->dispatch), bfqd->busy_queues > 0); + + /* + * Avoiding lock: a race on bfqd->busy_queues should cause at + * most a call to dispatch for nothing + */ + return !list_empty_careful(&bfqd->dispatch) || + bfqd->busy_queues > 0; +} + +static struct request *__bfq_dispatch_request(struct blk_mq_hw_ctx *hctx) +{ + struct bfq_data *bfqd = hctx->queue->elevator->elevator_data; + struct request *rq = NULL; + struct bfq_queue *bfqq = NULL; + + if (!list_empty(&bfqd->dispatch)) { + rq = list_first_entry(&bfqd->dispatch, struct request, + queuelist); + list_del_init(&rq->queuelist); + rq->rq_flags &= ~RQF_DISP_LIST; + + bfq_log(bfqd, + "dispatch requests: picked %p from dispatch list", rq); + bfqq = RQ_BFQQ(rq); + + if (bfqq) { + /* + * Increment counters here, because this + * dispatch does not follow the standard + * dispatch flow (where counters are + * incremented) + */ + bfqq->dispatched++; + + /* + * TESTING: reset DISP_LIST flag, because: 1) + * this rq this request has passed through + * get_rq_private, 2) then it will have + * put_rq_private invoked on it, and 3) in + * put_rq_private we use this flag to check + * that put_rq_private is not invoked on + * requests for which get_rq_private has been + * invoked. + */ + rq->rq_flags &= ~RQF_DISP_LIST; + goto inc_in_driver_start_rq; + } + + /* + * We exploit the put_rq_private hook to decrement + * rq_in_driver, but put_rq_private will not be + * invoked on this request. So, to avoid unbalance, + * just start this request, without incrementing + * rq_in_driver. As a negative consequence, + * rq_in_driver is deceptively lower than it should be + * while this request is in service. This may cause + * bfq_schedule_dispatch to be invoked uselessly. + * + * As for implementing an exact solution, the + * put_request hook, if defined, is probably invoked + * also on this request. So, by exploiting this hook, + * we could 1) increment rq_in_driver here, and 2) + * decrement it in put_request. Such a solution would + * let the value of the counter be always accurate, + * but it would entail using an extra interface + * function. This cost seems higher than the benefit, + * being the frequency of non-elevator-private + * requests very low. + */ + goto start_rq; + } + + bfq_log(bfqd, "dispatch requests: %d busy queues", bfqd->busy_queues); + + if (bfqd->busy_queues == 0) + goto exit; + + /* + * Force device to serve one request at a time if + * strict_guarantees is true. Forcing this service scheme is + * currently the ONLY way to guarantee that the request + * service order enforced by the scheduler is respected by a + * queueing device. Otherwise the device is free even to make + * some unlucky request wait for as long as the device + * wishes. + * + * Of course, serving one request at at time may cause loss of + * throughput. + */ + if (bfqd->strict_guarantees && bfqd->rq_in_driver > 0) + goto exit; + + bfqq = bfq_select_queue(bfqd); + if (!bfqq) + goto exit; + + BUG_ON(bfqq->entity.budget < bfqq->entity.service); + + BUG_ON(bfq_bfqq_wait_request(bfqq)); + + rq = bfq_dispatch_rq_from_bfqq(bfqd, bfqq); + + BUG_ON(bfqq->next_rq == NULL && + bfqq->entity.budget < bfqq->entity.service); + + if (rq) { + inc_in_driver_start_rq: + bfqd->rq_in_driver++; + start_rq: + rq->rq_flags |= RQF_STARTED; + if (bfqq) + bfq_log_bfqq(bfqd, bfqq, + "dispatched %s request %p, rq_in_driver %d", + bfq_bfqq_sync(bfqq) ? "sync" : "async", + rq, + bfqd->rq_in_driver); + else + bfq_log(bfqd, + "dispatched request %p from dispatch list, rq_in_driver %d", + rq, bfqd->rq_in_driver); + } else + bfq_log(bfqd, + "returned NULL request, rq_in_driver %d", + bfqd->rq_in_driver); + +exit: + return rq; +} + +static struct request *bfq_dispatch_request(struct blk_mq_hw_ctx *hctx) +{ + struct bfq_data *bfqd = hctx->queue->elevator->elevator_data; + struct request *rq; + + spin_lock_irq(&bfqd->lock); + + rq = __bfq_dispatch_request(hctx); + spin_unlock_irq(&bfqd->lock); + + return rq; +} + +/* + * Task holds one reference to the queue, dropped when task exits. Each rq + * in-flight on this queue also holds a reference, dropped when rq is freed. + * + * Scheduler lock must be held here. Recall not to use bfqq after calling + * this function on it. + */ +static void bfq_put_queue(struct bfq_queue *bfqq) +{ +#ifdef BFQ_GROUP_IOSCHED_ENABLED + struct bfq_group *bfqg = bfqq_group(bfqq); +#endif + + assert_spin_locked(&bfqq->bfqd->lock); + + BUG_ON(bfqq->ref <= 0); + + if (bfqq->bfqd) + bfq_log_bfqq(bfqq->bfqd, bfqq, "put_queue: %p %d", bfqq, bfqq->ref); + + bfqq->ref--; + if (bfqq->ref) + return; + + BUG_ON(rb_first(&bfqq->sort_list)); + BUG_ON(bfqq->allocated != 0); + BUG_ON(bfqq->entity.tree); + BUG_ON(bfq_bfqq_busy(bfqq)); + + if (bfq_bfqq_sync(bfqq)) + /* + * The fact that this queue is being destroyed does not + * invalidate the fact that this queue may have been + * activated during the current burst. As a consequence, + * although the queue does not exist anymore, and hence + * needs to be removed from the burst list if there, + * the burst size has not to be decremented. + */ + hlist_del_init(&bfqq->burst_list_node); + + if (bfqq->bfqd) + bfq_log_bfqq(bfqq->bfqd, bfqq, "put_queue: %p freed", bfqq); + + kmem_cache_free(bfq_pool, bfqq); +#ifdef BFQ_GROUP_IOSCHED_ENABLED + bfqg_and_blkg_put(bfqg); +#endif +} + +static void bfq_put_cooperator(struct bfq_queue *bfqq) +{ + struct bfq_queue *__bfqq, *next; + + /* + * If this queue was scheduled to merge with another queue, be + * sure to drop the reference taken on that queue (and others in + * the merge chain). See bfq_setup_merge and bfq_merge_bfqqs. + */ + __bfqq = bfqq->new_bfqq; + while (__bfqq) { + if (__bfqq == bfqq) + break; + next = __bfqq->new_bfqq; + bfq_put_queue(__bfqq); + __bfqq = next; + } +} + +static void bfq_exit_bfqq(struct bfq_data *bfqd, struct bfq_queue *bfqq) +{ + if (bfqq == bfqd->in_service_queue) { + __bfq_bfqq_expire(bfqd, bfqq); + bfq_schedule_dispatch(bfqd); + } + + bfq_log_bfqq(bfqd, bfqq, "exit_bfqq: %p, %d", bfqq, bfqq->ref); + + bfq_put_cooperator(bfqq); + + bfq_put_queue(bfqq); /* release process reference */ +} + +static void bfq_exit_icq_bfqq(struct bfq_io_cq *bic, bool is_sync) +{ + struct bfq_queue *bfqq = bic_to_bfqq(bic, is_sync); + struct bfq_data *bfqd; + + if (bfqq) + bfqd = bfqq->bfqd; /* NULL if scheduler already exited */ + + if (bfqq && bfqd) { + unsigned long flags; + + spin_lock_irqsave(&bfqd->lock, flags); + + bfq_exit_bfqq(bfqd, bfqq); + bic_set_bfqq(bic, NULL, is_sync); + spin_unlock_irqrestore(&bfqd->lock, flags); + } +} + +static void bfq_exit_icq(struct io_cq *icq) +{ + struct bfq_io_cq *bic = icq_to_bic(icq); + + BUG_ON(!bic); + bfq_exit_icq_bfqq(bic, true); + bfq_exit_icq_bfqq(bic, false); +} + +/* + * Update the entity prio values; note that the new values will not + * be used until the next (re)activation. + */ +static void bfq_set_next_ioprio_data(struct bfq_queue *bfqq, + struct bfq_io_cq *bic) +{ + struct task_struct *tsk = current; + int ioprio_class; + struct bfq_data *bfqd = bfqq->bfqd; + + WARN_ON(!bfqd); + if (!bfqd) + return; + + ioprio_class = IOPRIO_PRIO_CLASS(bic->ioprio); + switch (ioprio_class) { + default: + dev_err(bfqq->bfqd->queue->backing_dev_info->dev, + "bfq: bad prio class %d\n", ioprio_class); + case IOPRIO_CLASS_NONE: + /* + * No prio set, inherit CPU scheduling settings. + */ + bfqq->new_ioprio = task_nice_ioprio(tsk); + bfqq->new_ioprio_class = task_nice_ioclass(tsk); + break; + case IOPRIO_CLASS_RT: + bfqq->new_ioprio = IOPRIO_PRIO_DATA(bic->ioprio); + bfqq->new_ioprio_class = IOPRIO_CLASS_RT; + break; + case IOPRIO_CLASS_BE: + bfqq->new_ioprio = IOPRIO_PRIO_DATA(bic->ioprio); + bfqq->new_ioprio_class = IOPRIO_CLASS_BE; + break; + case IOPRIO_CLASS_IDLE: + bfqq->new_ioprio_class = IOPRIO_CLASS_IDLE; + bfqq->new_ioprio = 7; + break; + } + + if (bfqq->new_ioprio >= IOPRIO_BE_NR) { + pr_crit("bfq_set_next_ioprio_data: new_ioprio %d\n", + bfqq->new_ioprio); + BUG(); + } + + bfqq->entity.new_weight = bfq_ioprio_to_weight(bfqq->new_ioprio); + bfqq->entity.prio_changed = 1; + bfq_log_bfqq(bfqq->bfqd, bfqq, + "set_next_ioprio_data: bic_class %d prio %d class %d", + ioprio_class, bfqq->new_ioprio, bfqq->new_ioprio_class); +} + +static void bfq_check_ioprio_change(struct bfq_io_cq *bic, struct bio *bio) +{ + struct bfq_data *bfqd = bic_to_bfqd(bic); + struct bfq_queue *bfqq; + unsigned long uninitialized_var(flags); + int ioprio = bic->icq.ioc->ioprio; + + /* + * This condition may trigger on a newly created bic, be sure to + * drop the lock before returning. + */ + if (unlikely(!bfqd) || likely(bic->ioprio == ioprio)) + return; + + bic->ioprio = ioprio; + + bfqq = bic_to_bfqq(bic, false); + if (bfqq) { + /* release process reference on this queue */ + bfq_put_queue(bfqq); + bfqq = bfq_get_queue(bfqd, bio, BLK_RW_ASYNC, bic); + bic_set_bfqq(bic, bfqq, false); + bfq_log_bfqq(bfqd, bfqq, + "check_ioprio_change: bfqq %p %d", + bfqq, bfqq->ref); + } + + bfqq = bic_to_bfqq(bic, true); + if (bfqq) + bfq_set_next_ioprio_data(bfqq, bic); +} + +static void bfq_init_bfqq(struct bfq_data *bfqd, struct bfq_queue *bfqq, + struct bfq_io_cq *bic, pid_t pid, int is_sync) +{ + RB_CLEAR_NODE(&bfqq->entity.rb_node); + INIT_LIST_HEAD(&bfqq->fifo); + INIT_HLIST_NODE(&bfqq->burst_list_node); + BUG_ON(!hlist_unhashed(&bfqq->burst_list_node)); + + bfqq->ref = 0; + bfqq->bfqd = bfqd; + + if (bic) + bfq_set_next_ioprio_data(bfqq, bic); + + if (is_sync) { + /* + * No need to mark as has_short_ttime if in + * idle_class, because no device idling is performed + * for queues in idle class + */ + if (!bfq_class_idle(bfqq)) + /* tentatively mark as has_short_ttime */ + bfq_mark_bfqq_has_short_ttime(bfqq); + bfq_mark_bfqq_sync(bfqq); + bfq_mark_bfqq_just_created(bfqq); + } else + bfq_clear_bfqq_sync(bfqq); + + bfqq->ttime.last_end_request = ktime_get_ns() - (1ULL<<32); + + bfq_mark_bfqq_IO_bound(bfqq); + + /* Tentative initial value to trade off between thr and lat */ + bfqq->max_budget = (2 * bfq_max_budget(bfqd)) / 3; + bfqq->pid = pid; + + bfqq->wr_coeff = 1; + bfqq->last_wr_start_finish = jiffies; + bfqq->wr_start_at_switch_to_srt = bfq_smallest_from_now(); + bfqq->budget_timeout = bfq_smallest_from_now(); + bfqq->split_time = bfq_smallest_from_now(); + + /* + * Set to the value for which bfqq will not be deemed as + * soft rt when it becomes backlogged. + */ + bfqq->soft_rt_next_start = bfq_greatest_from_now(); + + /* first request is almost certainly seeky */ + bfqq->seek_history = 1; +} + +static struct bfq_queue **bfq_async_queue_prio(struct bfq_data *bfqd, + struct bfq_group *bfqg, + int ioprio_class, int ioprio) +{ + switch (ioprio_class) { + case IOPRIO_CLASS_RT: + return &bfqg->async_bfqq[0][ioprio]; + case IOPRIO_CLASS_NONE: + ioprio = IOPRIO_NORM; + /* fall through */ + case IOPRIO_CLASS_BE: + return &bfqg->async_bfqq[1][ioprio]; + case IOPRIO_CLASS_IDLE: + return &bfqg->async_idle_bfqq; + default: + BUG(); + } +} + +static struct bfq_queue *bfq_get_queue(struct bfq_data *bfqd, + struct bio *bio, bool is_sync, + struct bfq_io_cq *bic) +{ + const int ioprio = IOPRIO_PRIO_DATA(bic->ioprio); + const int ioprio_class = IOPRIO_PRIO_CLASS(bic->ioprio); + struct bfq_queue **async_bfqq = NULL; + struct bfq_queue *bfqq; + struct bfq_group *bfqg; + + rcu_read_lock(); + + bfqg = bfq_find_set_group(bfqd, bio_blkcg(bio)); + if (!bfqg) { + bfqq = &bfqd->oom_bfqq; + goto out; + } + + if (!is_sync) { + async_bfqq = bfq_async_queue_prio(bfqd, bfqg, ioprio_class, + ioprio); + bfqq = *async_bfqq; + if (bfqq) + goto out; + } + + bfqq = kmem_cache_alloc_node(bfq_pool, + GFP_NOWAIT | __GFP_ZERO | __GFP_NOWARN, + bfqd->queue->node); + + if (bfqq) { + bfq_init_bfqq(bfqd, bfqq, bic, current->pid, + is_sync); + bfq_init_entity(&bfqq->entity, bfqg); + bfq_log_bfqq(bfqd, bfqq, "allocated"); + } else { + bfqq = &bfqd->oom_bfqq; + bfq_log_bfqq(bfqd, bfqq, "using oom bfqq"); + goto out; + } + + /* + * Pin the queue now that it's allocated, scheduler exit will + * prune it. + */ + if (async_bfqq) { + bfqq->ref++; /* + * Extra group reference, w.r.t. sync + * queue. This extra reference is removed + * only if bfqq->bfqg disappears, to + * guarantee that this queue is not freed + * until its group goes away. + */ + bfq_log_bfqq(bfqd, bfqq, "get_queue, bfqq not in async: %p, %d", + bfqq, bfqq->ref); + *async_bfqq = bfqq; + } + +out: + bfqq->ref++; /* get a process reference to this queue */ + bfq_log_bfqq(bfqd, bfqq, "get_queue, at end: %p, %d", bfqq, bfqq->ref); + rcu_read_unlock(); + return bfqq; +} + +static void bfq_update_io_thinktime(struct bfq_data *bfqd, + struct bfq_queue *bfqq) +{ + struct bfq_ttime *ttime = &bfqq->ttime; + u64 elapsed = ktime_get_ns() - bfqq->ttime.last_end_request; + + elapsed = min_t(u64, elapsed, 2 * bfqd->bfq_slice_idle); + + ttime->ttime_samples = (7*bfqq->ttime.ttime_samples + 256) / 8; + ttime->ttime_total = div_u64(7*ttime->ttime_total + 256*elapsed, 8); + ttime->ttime_mean = div64_ul(ttime->ttime_total + 128, + ttime->ttime_samples); +} + +static void +bfq_update_io_seektime(struct bfq_data *bfqd, struct bfq_queue *bfqq, + struct request *rq) +{ + bfqq->seek_history <<= 1; + bfqq->seek_history |= + get_sdist(bfqq->last_request_pos, rq) > BFQQ_SEEK_THR && + (!blk_queue_nonrot(bfqd->queue) || + blk_rq_sectors(rq) < BFQQ_SECT_THR_NONROT); +} + +static void bfq_update_has_short_ttime(struct bfq_data *bfqd, + struct bfq_queue *bfqq, + struct bfq_io_cq *bic) +{ + bool has_short_ttime = true; + + /* + * No need to update has_short_ttime if bfqq is async or in + * idle io prio class, or if bfq_slice_idle is zero, because + * no device idling is performed for bfqq in this case. + */ + if (!bfq_bfqq_sync(bfqq) || bfq_class_idle(bfqq) || + bfqd->bfq_slice_idle == 0) + return; + + /* Idle window just restored, statistics are meaningless. */ + if (time_is_after_eq_jiffies(bfqq->split_time + + bfqd->bfq_wr_min_idle_time)) + return; + + /* Think time is infinite if no process is linked to + * bfqq. Otherwise check average think time to + * decide whether to mark as has_short_ttime + */ + if (atomic_read(&bic->icq.ioc->active_ref) == 0 || + (bfq_sample_valid(bfqq->ttime.ttime_samples) && + bfqq->ttime.ttime_mean > bfqd->bfq_slice_idle)) + has_short_ttime = false; + + bfq_log_bfqq(bfqd, bfqq, "update_has_short_ttime: has_short_ttime %d", + has_short_ttime); + + if (has_short_ttime) + bfq_mark_bfqq_has_short_ttime(bfqq); + else + bfq_clear_bfqq_has_short_ttime(bfqq); +} + +/* + * Called when a new fs request (rq) is added to bfqq. Check if there's + * something we should do about it. + */ +static void bfq_rq_enqueued(struct bfq_data *bfqd, struct bfq_queue *bfqq, + struct request *rq) +{ + struct bfq_io_cq *bic = RQ_BIC(rq); + + if (rq->cmd_flags & REQ_META) + bfqq->meta_pending++; + + bfq_update_io_thinktime(bfqd, bfqq); + bfq_update_has_short_ttime(bfqd, bfqq, bic); + bfq_update_io_seektime(bfqd, bfqq, rq); + + bfq_log_bfqq(bfqd, bfqq, + "rq_enqueued: has_short_ttime=%d (seeky %d)", + bfq_bfqq_has_short_ttime(bfqq), BFQQ_SEEKY(bfqq)); + + bfqq->last_request_pos = blk_rq_pos(rq) + blk_rq_sectors(rq); + + if (bfqq == bfqd->in_service_queue && bfq_bfqq_wait_request(bfqq)) { + bool small_req = bfqq->queued[rq_is_sync(rq)] == 1 && + blk_rq_sectors(rq) < 32; + bool budget_timeout = bfq_bfqq_budget_timeout(bfqq); + + /* + * There is just this request queued: if the request + * is small and the queue is not to be expired, then + * just exit. + * + * In this way, if the device is being idled to wait + * for a new request from the in-service queue, we + * avoid unplugging the device and committing the + * device to serve just a small request. On the + * contrary, we wait for the block layer to decide + * when to unplug the device: hopefully, new requests + * will be merged to this one quickly, then the device + * will be unplugged and larger requests will be + * dispatched. + */ + if (small_req && !budget_timeout) + return; + + /* + * A large enough request arrived, or the queue is to + * be expired: in both cases disk idling is to be + * stopped, so clear wait_request flag and reset + * timer. + */ + bfq_clear_bfqq_wait_request(bfqq); + hrtimer_try_to_cancel(&bfqd->idle_slice_timer); + bfqg_stats_update_idle_time(bfqq_group(bfqq)); + + /* + * The queue is not empty, because a new request just + * arrived. Hence we can safely expire the queue, in + * case of budget timeout, without risking that the + * timestamps of the queue are not updated correctly. + * See [1] for more details. + */ + if (budget_timeout) + bfq_bfqq_expire(bfqd, bfqq, false, + BFQ_BFQQ_BUDGET_TIMEOUT); + } +} + +static void __bfq_insert_request(struct bfq_data *bfqd, struct request *rq) +{ + struct bfq_queue *bfqq = RQ_BFQQ(rq), *new_bfqq; + BUG_ON(!bfqq); + + assert_spin_locked(&bfqd->lock); + + bfq_log_bfqq(bfqd, bfqq, "__insert_req: rq %p bfqq %p", rq, bfqq); + + /* + * An unplug may trigger a requeue of a request from the device + * driver: make sure we are in process context while trying to + * merge two bfq_queues. + */ + if (!in_interrupt()) { + new_bfqq = bfq_setup_cooperator(bfqd, bfqq, rq, true); + if (new_bfqq) { + if (bic_to_bfqq(RQ_BIC(rq), 1) != bfqq) + new_bfqq = bic_to_bfqq(RQ_BIC(rq), 1); + /* + * Release the request's reference to the old bfqq + * and make sure one is taken to the shared queue. + */ + new_bfqq->allocated++; + bfqq->allocated--; + bfq_log_bfqq(bfqd, bfqq, + "insert_request: new allocated %d", bfqq->allocated); + bfq_log_bfqq(bfqd, new_bfqq, + "insert_request: new_bfqq new allocated %d", + bfqq->allocated); + + new_bfqq->ref++; + bfq_clear_bfqq_just_created(bfqq); + /* + * If the bic associated with the process + * issuing this request still points to bfqq + * (and thus has not been already redirected + * to new_bfqq or even some other bfq_queue), + * then complete the merge and redirect it to + * new_bfqq. + */ + if (bic_to_bfqq(RQ_BIC(rq), 1) == bfqq) + bfq_merge_bfqqs(bfqd, RQ_BIC(rq), + bfqq, new_bfqq); + /* + * rq is about to be enqueued into new_bfqq, + * release rq reference on bfqq + */ + bfq_put_queue(bfqq); + rq->elv.priv[1] = new_bfqq; + bfqq = new_bfqq; + } + } + + bfq_add_request(rq); + + rq->fifo_time = ktime_get_ns() + bfqd->bfq_fifo_expire[rq_is_sync(rq)]; + list_add_tail(&rq->queuelist, &bfqq->fifo); + + bfq_rq_enqueued(bfqd, bfqq, rq); +} + +static void bfq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq, + bool at_head) +{ + struct request_queue *q = hctx->queue; + struct bfq_data *bfqd = q->elevator->elevator_data; + + spin_lock_irq(&bfqd->lock); + if (blk_mq_sched_try_insert_merge(q, rq)) { + spin_unlock_irq(&bfqd->lock); + return; + } + + spin_unlock_irq(&bfqd->lock); + + blk_mq_sched_request_inserted(rq); + + spin_lock_irq(&bfqd->lock); + if (at_head || blk_rq_is_passthrough(rq)) { + struct bfq_queue *bfqq = RQ_BFQQ(rq); + + if (at_head) + list_add(&rq->queuelist, &bfqd->dispatch); + else + list_add_tail(&rq->queuelist, &bfqd->dispatch); + + rq->rq_flags |= RQF_DISP_LIST; + if (bfqq) + bfq_log_bfqq(bfqd, bfqq, + "insert_request %p in disp: at_head %d", + rq, at_head); + else + bfq_log(bfqd, + "insert_request %p in disp: at_head %d", + rq, at_head); + } else { + BUG_ON(!(rq->rq_flags & RQF_GOT)); + rq->rq_flags &= ~RQF_GOT; + + __bfq_insert_request(bfqd, rq); + + if (rq_mergeable(rq)) { + elv_rqhash_add(q, rq); + if (!q->last_merge) + q->last_merge = rq; + } + } + + spin_unlock_irq(&bfqd->lock); +} + +static void bfq_insert_requests(struct blk_mq_hw_ctx *hctx, + struct list_head *list, bool at_head) +{ + while (!list_empty(list)) { + struct request *rq; + + rq = list_first_entry(list, struct request, queuelist); + list_del_init(&rq->queuelist); + bfq_insert_request(hctx, rq, at_head); + } +} + +static void bfq_update_hw_tag(struct bfq_data *bfqd) +{ + bfqd->max_rq_in_driver = max_t(int, bfqd->max_rq_in_driver, + bfqd->rq_in_driver); + + if (bfqd->hw_tag == 1) + return; + + /* + * This sample is valid if the number of outstanding requests + * is large enough to allow a queueing behavior. Note that the + * sum is not exact, as it's not taking into account deactivated + * requests. + */ + if (bfqd->rq_in_driver + bfqd->queued < BFQ_HW_QUEUE_THRESHOLD) + return; + + if (bfqd->hw_tag_samples++ < BFQ_HW_QUEUE_SAMPLES) + return; + + bfqd->hw_tag = bfqd->max_rq_in_driver > BFQ_HW_QUEUE_THRESHOLD; + bfqd->max_rq_in_driver = 0; + bfqd->hw_tag_samples = 0; +} + +static void bfq_completed_request(struct bfq_queue *bfqq, struct bfq_data *bfqd) +{ + u64 now_ns; + u32 delta_us; + + bfq_update_hw_tag(bfqd); + + BUG_ON(!bfqd->rq_in_driver); + BUG_ON(!bfqq->dispatched); + bfqd->rq_in_driver--; + bfqq->dispatched--; + + bfq_log_bfqq(bfqd, bfqq, + "completed_requests: new disp %d, new rq_in_driver %d", + bfqq->dispatched, bfqd->rq_in_driver); + + if (!bfqq->dispatched && !bfq_bfqq_busy(bfqq)) { + BUG_ON(!RB_EMPTY_ROOT(&bfqq->sort_list)); + /* + * Set budget_timeout (which we overload to store the + * time at which the queue remains with no backlog and + * no outstanding request; used by the weight-raising + * mechanism). + */ + bfqq->budget_timeout = jiffies; + + bfq_weights_tree_remove(bfqd, &bfqq->entity, + &bfqd->queue_weights_tree); + } + + now_ns = ktime_get_ns(); + + bfqq->ttime.last_end_request = now_ns; + + /* + * Using us instead of ns, to get a reasonable precision in + * computing rate in next check. + */ + delta_us = div_u64(now_ns - bfqd->last_completion, NSEC_PER_USEC); + + bfq_log_bfqq(bfqd, bfqq, + "rq_completed: delta %uus/%luus max_size %u rate %llu/%llu", + delta_us, BFQ_MIN_TT/NSEC_PER_USEC, bfqd->last_rq_max_size, + (USEC_PER_SEC* + (u64)((bfqd->last_rq_max_size<>BFQ_RATE_SHIFT, + (USEC_PER_SEC*(u64)(1UL<<(BFQ_RATE_SHIFT-10)))>>BFQ_RATE_SHIFT); + + /* + * If the request took rather long to complete, and, according + * to the maximum request size recorded, this completion latency + * implies that the request was certainly served at a very low + * rate (less than 1M sectors/sec), then the whole observation + * interval that lasts up to this time instant cannot be a + * valid time interval for computing a new peak rate. Invoke + * bfq_update_rate_reset to have the following three steps + * taken: + * - close the observation interval at the last (previous) + * request dispatch or completion + * - compute rate, if possible, for that observation interval + * - reset to zero samples, which will trigger a proper + * re-initialization of the observation interval on next + * dispatch + */ + if (delta_us > BFQ_MIN_TT/NSEC_PER_USEC && + (bfqd->last_rq_max_size<last_completion = now_ns; + + /* + * If we are waiting to discover whether the request pattern + * of the task associated with the queue is actually + * isochronous, and both requisites for this condition to hold + * are now satisfied, then compute soft_rt_next_start (see the + * comments on the function bfq_bfqq_softrt_next_start()). We + * schedule this delayed check when bfqq expires, if it still + * has in-flight requests. + */ + if (bfq_bfqq_softrt_update(bfqq) && bfqq->dispatched == 0 && + RB_EMPTY_ROOT(&bfqq->sort_list)) + bfqq->soft_rt_next_start = + bfq_bfqq_softrt_next_start(bfqd, bfqq); + + /* + * If this is the in-service queue, check if it needs to be expired, + * or if we want to idle in case it has no pending requests. + */ + if (bfqd->in_service_queue == bfqq) { + if (bfqq->dispatched == 0 && bfq_bfqq_must_idle(bfqq)) { + bfq_arm_slice_timer(bfqd); + return; + } else if (bfq_may_expire_for_budg_timeout(bfqq)) + bfq_bfqq_expire(bfqd, bfqq, false, + BFQ_BFQQ_BUDGET_TIMEOUT); + else if (RB_EMPTY_ROOT(&bfqq->sort_list) && + (bfqq->dispatched == 0 || + !bfq_bfqq_may_idle(bfqq))) + bfq_bfqq_expire(bfqd, bfqq, false, + BFQ_BFQQ_NO_MORE_REQUESTS); + } +} + +static void bfq_put_rq_priv_body(struct bfq_queue *bfqq) +{ + bfq_log_bfqq(bfqq->bfqd, bfqq, + "put_request_body: allocated %d", bfqq->allocated); + BUG_ON(!bfqq->allocated); + bfqq->allocated--; + + bfq_put_queue(bfqq); +} + +static void bfq_finish_request(struct request *rq) +{ + struct bfq_queue *bfqq; + struct bfq_data *bfqd; + struct bfq_io_cq *bic; + + BUG_ON(!rq); + + if (!rq->elv.icq) + return; + + bfqq = RQ_BFQQ(rq); + BUG_ON(!bfqq); + + bic = RQ_BIC(rq); + BUG_ON(!bic); + + bfqd = bfqq->bfqd; + BUG_ON(!bfqd); + + if (rq->rq_flags & RQF_DISP_LIST) { + pr_crit("putting disp rq %p for %d", rq, bfqq->pid); + BUG(); + } + BUG_ON(rq->rq_flags & RQF_QUEUED); + BUG_ON(!(rq->rq_flags & RQF_ELVPRIV)); + + bfq_log_bfqq(bfqd, bfqq, + "putting rq %p with %u sects left, STARTED %d", + rq, blk_rq_sectors(rq), + rq->rq_flags & RQF_STARTED); + + if (rq->rq_flags & RQF_STARTED) + bfqg_stats_update_completion(bfqq_group(bfqq), + rq_start_time_ns(rq), + rq_io_start_time_ns(rq), + rq->cmd_flags); + + BUG_ON(blk_rq_sectors(rq) == 0 && !(rq->rq_flags & RQF_STARTED)); + + if (likely(rq->rq_flags & RQF_STARTED)) { + unsigned long flags; + + spin_lock_irqsave(&bfqd->lock, flags); + + bfq_completed_request(bfqq, bfqd); + bfq_put_rq_priv_body(bfqq); + + spin_unlock_irqrestore(&bfqd->lock, flags); + } else { + /* + * Request rq may be still/already in the scheduler, + * in which case we need to remove it. And we cannot + * defer such a check and removal, to avoid + * inconsistencies in the time interval from the end + * of this function to the start of the deferred work. + * This situation seems to occur only in process + * context, as a consequence of a merge. In the + * current version of the code, this implies that the + * lock is held. + */ + BUG_ON(in_interrupt()); + + assert_spin_locked(&bfqd->lock); + if (!RB_EMPTY_NODE(&rq->rb_node)) + bfq_remove_request(rq->q, rq); + bfq_put_rq_priv_body(bfqq); + } + + rq->elv.priv[0] = NULL; + rq->elv.priv[1] = NULL; +} + +/* + * Returns NULL if a new bfqq should be allocated, or the old bfqq if this + * was the last process referring to that bfqq. + */ +static struct bfq_queue * +bfq_split_bfqq(struct bfq_io_cq *bic, struct bfq_queue *bfqq) +{ + bfq_log_bfqq(bfqq->bfqd, bfqq, "splitting queue"); + + if (bfqq_process_refs(bfqq) == 1) { + bfqq->pid = current->pid; + bfq_clear_bfqq_coop(bfqq); + bfq_clear_bfqq_split_coop(bfqq); + return bfqq; + } + + bic_set_bfqq(bic, NULL, 1); + + bfq_put_cooperator(bfqq); + + bfq_put_queue(bfqq); + return NULL; +} + +static struct bfq_queue *bfq_get_bfqq_handle_split(struct bfq_data *bfqd, + struct bfq_io_cq *bic, + struct bio *bio, + bool split, bool is_sync, + bool *new_queue) +{ + struct bfq_queue *bfqq = bic_to_bfqq(bic, is_sync); + + if (likely(bfqq && bfqq != &bfqd->oom_bfqq)) + return bfqq; + + if (new_queue) + *new_queue = true; + + if (bfqq) + bfq_put_queue(bfqq); + bfqq = bfq_get_queue(bfqd, bio, is_sync, bic); + BUG_ON(!hlist_unhashed(&bfqq->burst_list_node)); + + bic_set_bfqq(bic, bfqq, is_sync); + if (split && is_sync) { + bfq_log_bfqq(bfqd, bfqq, + "get_request: was_in_list %d " + "was_in_large_burst %d " + "large burst in progress %d", + bic->was_in_burst_list, + bic->saved_in_large_burst, + bfqd->large_burst); + + if ((bic->was_in_burst_list && bfqd->large_burst) || + bic->saved_in_large_burst) { + bfq_log_bfqq(bfqd, bfqq, + "get_request: marking in " + "large burst"); + bfq_mark_bfqq_in_large_burst(bfqq); + } else { + bfq_log_bfqq(bfqd, bfqq, + "get_request: clearing in " + "large burst"); + bfq_clear_bfqq_in_large_burst(bfqq); + if (bic->was_in_burst_list) + hlist_add_head(&bfqq->burst_list_node, + &bfqd->burst_list); + } + bfqq->split_time = jiffies; + } + + return bfqq; +} + +/* + * Allocate bfq data structures associated with this request. + */ +static void bfq_prepare_request(struct request *rq, struct bio *bio) +{ + struct request_queue *q = rq->q; + struct bfq_data *bfqd = q->elevator->elevator_data; + struct bfq_io_cq *bic; + const int is_sync = rq_is_sync(rq); + struct bfq_queue *bfqq; + bool bfqq_already_existing = false, split = false; + bool new_queue = false; + + if (!rq->elv.icq) + return; + bic = icq_to_bic(rq->elv.icq); + + spin_lock_irq(&bfqd->lock); + + bfq_check_ioprio_change(bic, bio); + + bfq_bic_update_cgroup(bic, bio); + + bfqq = bfq_get_bfqq_handle_split(bfqd, bic, bio, false, is_sync, + &new_queue); + + if (likely(!new_queue)) { + /* If the queue was seeky for too long, break it apart. */ + if (bfq_bfqq_coop(bfqq) && bfq_bfqq_split_coop(bfqq)) { + BUG_ON(!is_sync); + bfq_log_bfqq(bfqd, bfqq, "breaking apart bfqq"); + + /* Update bic before losing reference to bfqq */ + if (bfq_bfqq_in_large_burst(bfqq)) + bic->saved_in_large_burst = true; + + bfqq = bfq_split_bfqq(bic, bfqq); + + if (!bfqq) + bfqq = bfq_get_bfqq_handle_split(bfqd, bic, bio, + true, is_sync, + NULL); + else + bfqq_already_existing = true; + + BUG_ON(!bfqq); + BUG_ON(bfqq == &bfqd->oom_bfqq); + } + } + + bfqq->allocated++; + bfq_log_bfqq(bfqq->bfqd, bfqq, + "get_request: new allocated %d", bfqq->allocated); + + bfqq->ref++; + bfq_log_bfqq(bfqd, bfqq, "get_request %p: bfqq %p, %d", rq, bfqq, bfqq->ref); + + rq->elv.priv[0] = bic; + rq->elv.priv[1] = bfqq; + rq->rq_flags &= ~RQF_DISP_LIST; + + /* + * If a bfq_queue has only one process reference, it is owned + * by only this bic: we can then set bfqq->bic = bic. in + * addition, if the queue has also just been split, we have to + * resume its state. + */ + if (likely(bfqq != &bfqd->oom_bfqq) && bfqq_process_refs(bfqq) == 1) { + bfqq->bic = bic; + if (split) { + /* + * The queue has just been split from a shared + * queue: restore the idle window and the + * possible weight raising period. + */ + bfq_bfqq_resume_state(bfqq, bfqd, bic, + bfqq_already_existing); + } + } + + if (unlikely(bfq_bfqq_just_created(bfqq))) + bfq_handle_burst(bfqd, bfqq); + + rq->rq_flags |= RQF_GOT; + spin_unlock_irq(&bfqd->lock); +} + +static void bfq_idle_slice_timer_body(struct bfq_queue *bfqq) +{ + struct bfq_data *bfqd = bfqq->bfqd; + enum bfqq_expiration reason; + unsigned long flags; + + BUG_ON(!bfqd); + spin_lock_irqsave(&bfqd->lock, flags); + + bfq_log_bfqq(bfqd, bfqq, "handling slice_timer expiration"); + bfq_clear_bfqq_wait_request(bfqq); + + if (bfqq != bfqd->in_service_queue) { + spin_unlock_irqrestore(&bfqd->lock, flags); + return; + } + + if (bfq_bfqq_budget_timeout(bfqq)) + /* + * Also here the queue can be safely expired + * for budget timeout without wasting + * guarantees + */ + reason = BFQ_BFQQ_BUDGET_TIMEOUT; + else if (bfqq->queued[0] == 0 && bfqq->queued[1] == 0) + /* + * The queue may not be empty upon timer expiration, + * because we may not disable the timer when the + * first request of the in-service queue arrives + * during disk idling. + */ + reason = BFQ_BFQQ_TOO_IDLE; + else + goto schedule_dispatch; + + bfq_bfqq_expire(bfqd, bfqq, true, reason); + +schedule_dispatch: + spin_unlock_irqrestore(&bfqd->lock, flags); + bfq_schedule_dispatch(bfqd); +} + +/* + * Handler of the expiration of the timer running if the in-service queue + * is idling inside its time slice. + */ +static enum hrtimer_restart bfq_idle_slice_timer(struct hrtimer *timer) +{ + struct bfq_data *bfqd = container_of(timer, struct bfq_data, + idle_slice_timer); + struct bfq_queue *bfqq = bfqd->in_service_queue; + + bfq_log(bfqd, "slice_timer expired"); + + /* + * Theoretical race here: the in-service queue can be NULL or + * different from the queue that was idling if a new request + * arrives for the current queue and there is a full dispatch + * cycle that changes the in-service queue. This can hardly + * happen, but in the worst case we just expire a queue too + * early. + */ + if (bfqq) + bfq_idle_slice_timer_body(bfqq); + + return HRTIMER_NORESTART; +} + +static void __bfq_put_async_bfqq(struct bfq_data *bfqd, + struct bfq_queue **bfqq_ptr) +{ + struct bfq_group *root_group = bfqd->root_group; + struct bfq_queue *bfqq = *bfqq_ptr; + + bfq_log(bfqd, "put_async_bfqq: %p", bfqq); + if (bfqq) { + bfq_bfqq_move(bfqd, bfqq, root_group); + bfq_log_bfqq(bfqd, bfqq, "put_async_bfqq: putting %p, %d", + bfqq, bfqq->ref); + bfq_put_queue(bfqq); + *bfqq_ptr = NULL; + } +} + +/* + * Release all the bfqg references to its async queues. If we are + * deallocating the group these queues may still contain requests, so + * we reparent them to the root cgroup (i.e., the only one that will + * exist for sure until all the requests on a device are gone). + */ +static void bfq_put_async_queues(struct bfq_data *bfqd, struct bfq_group *bfqg) +{ + int i, j; + + for (i = 0; i < 2; i++) + for (j = 0; j < IOPRIO_BE_NR; j++) + __bfq_put_async_bfqq(bfqd, &bfqg->async_bfqq[i][j]); + + __bfq_put_async_bfqq(bfqd, &bfqg->async_idle_bfqq); +} + +static void bfq_exit_queue(struct elevator_queue *e) +{ + struct bfq_data *bfqd = e->elevator_data; + struct bfq_queue *bfqq, *n; + + bfq_log(bfqd, "exit_queue: starting ..."); + + hrtimer_cancel(&bfqd->idle_slice_timer); + + BUG_ON(bfqd->in_service_queue); + BUG_ON(!list_empty(&bfqd->active_list)); + + spin_lock_irq(&bfqd->lock); + list_for_each_entry_safe(bfqq, n, &bfqd->idle_list, bfqq_list) + bfq_deactivate_bfqq(bfqd, bfqq, false, false); + spin_unlock_irq(&bfqd->lock); + + hrtimer_cancel(&bfqd->idle_slice_timer); + + BUG_ON(hrtimer_active(&bfqd->idle_slice_timer)); + +#ifdef BFQ_GROUP_IOSCHED_ENABLED + blkcg_deactivate_policy(bfqd->queue, &blkcg_policy_bfq); +#else + spin_lock_irq(&bfqd->lock); + bfq_put_async_queues(bfqd, bfqd->root_group); + kfree(bfqd->root_group); + spin_unlock_irq(&bfqd->lock); +#endif + + bfq_log(bfqd, "exit_queue: finished ..."); + kfree(bfqd); +} + +static void bfq_init_root_group(struct bfq_group *root_group, + struct bfq_data *bfqd) +{ + int i; + +#ifdef BFQ_GROUP_IOSCHED_ENABLED + root_group->entity.parent = NULL; + root_group->my_entity = NULL; + root_group->bfqd = bfqd; +#endif + root_group->rq_pos_tree = RB_ROOT; + for (i = 0; i < BFQ_IOPRIO_CLASSES; i++) + root_group->sched_data.service_tree[i] = BFQ_SERVICE_TREE_INIT; + root_group->sched_data.bfq_class_idle_last_service = jiffies; +} + +static int bfq_init_queue(struct request_queue *q, struct elevator_type *e) +{ + struct bfq_data *bfqd; + struct elevator_queue *eq; + + eq = elevator_alloc(q, e); + if (!eq) + return -ENOMEM; + + bfqd = kzalloc_node(sizeof(*bfqd), GFP_KERNEL, q->node); + if (!bfqd) { + kobject_put(&eq->kobj); + return -ENOMEM; + } + eq->elevator_data = bfqd; + + spin_lock_irq(q->queue_lock); + q->elevator = eq; + spin_unlock_irq(q->queue_lock); + + /* + * Our fallback bfqq if bfq_find_alloc_queue() runs into OOM issues. + * Grab a permanent reference to it, so that the normal code flow + * will not attempt to free it. + */ + bfq_init_bfqq(bfqd, &bfqd->oom_bfqq, NULL, 1, 0); + bfqd->oom_bfqq.ref++; + bfqd->oom_bfqq.new_ioprio = BFQ_DEFAULT_QUEUE_IOPRIO; + bfqd->oom_bfqq.new_ioprio_class = IOPRIO_CLASS_BE; + bfqd->oom_bfqq.entity.new_weight = + bfq_ioprio_to_weight(bfqd->oom_bfqq.new_ioprio); + + /* oom_bfqq does not participate to bursts */ + bfq_clear_bfqq_just_created(&bfqd->oom_bfqq); + /* + * Trigger weight initialization, according to ioprio, at the + * oom_bfqq's first activation. The oom_bfqq's ioprio and ioprio + * class won't be changed any more. + */ + bfqd->oom_bfqq.entity.prio_changed = 1; + + bfqd->queue = q; + INIT_LIST_HEAD(&bfqd->dispatch); + + hrtimer_init(&bfqd->idle_slice_timer, CLOCK_MONOTONIC, + HRTIMER_MODE_REL); + bfqd->idle_slice_timer.function = bfq_idle_slice_timer; + + bfqd->queue_weights_tree = RB_ROOT; + bfqd->group_weights_tree = RB_ROOT; + + INIT_LIST_HEAD(&bfqd->active_list); + INIT_LIST_HEAD(&bfqd->idle_list); + INIT_HLIST_HEAD(&bfqd->burst_list); + + bfqd->hw_tag = -1; + + bfqd->bfq_max_budget = bfq_default_max_budget; + + bfqd->bfq_fifo_expire[0] = bfq_fifo_expire[0]; + bfqd->bfq_fifo_expire[1] = bfq_fifo_expire[1]; + bfqd->bfq_back_max = bfq_back_max; + bfqd->bfq_back_penalty = bfq_back_penalty; + bfqd->bfq_slice_idle = bfq_slice_idle; + bfqd->bfq_timeout = bfq_timeout; + + bfqd->bfq_requests_within_timer = 120; + + bfqd->bfq_large_burst_thresh = 8; + bfqd->bfq_burst_interval = msecs_to_jiffies(180); + + bfqd->low_latency = true; + + /* + * Trade-off between responsiveness and fairness. + */ + bfqd->bfq_wr_coeff = 30; + bfqd->bfq_wr_rt_max_time = msecs_to_jiffies(300); + bfqd->bfq_wr_max_time = 0; + bfqd->bfq_wr_min_idle_time = msecs_to_jiffies(2000); + bfqd->bfq_wr_min_inter_arr_async = msecs_to_jiffies(500); + bfqd->bfq_wr_max_softrt_rate = 7000; /* + * Approximate rate required + * to playback or record a + * high-definition compressed + * video. + */ + bfqd->wr_busy_queues = 0; + + /* + * Begin by assuming, optimistically, that the device is a + * high-speed one, and that its peak rate is equal to 2/3 of + * the highest reference rate. + */ + bfqd->RT_prod = R_fast[blk_queue_nonrot(bfqd->queue)] * + T_fast[blk_queue_nonrot(bfqd->queue)]; + bfqd->peak_rate = R_fast[blk_queue_nonrot(bfqd->queue)] * 2 / 3; + bfqd->device_speed = BFQ_BFQD_FAST; + + spin_lock_init(&bfqd->lock); + + /* + * The invocation of the next bfq_create_group_hierarchy + * function is the head of a chain of function calls + * (bfq_create_group_hierarchy->blkcg_activate_policy-> + * blk_mq_freeze_queue) that may lead to the invocation of the + * has_work hook function. For this reason, + * bfq_create_group_hierarchy is invoked only after all + * scheduler data has been initialized, apart from the fields + * that can be initialized only after invoking + * bfq_create_group_hierarchy. This, in particular, enables + * has_work to correctly return false. Of course, to avoid + * other inconsistencies, the blk-mq stack must then refrain + * from invoking further scheduler hooks before this init + * function is finished. + */ + bfqd->root_group = bfq_create_group_hierarchy(bfqd, q->node); + if (!bfqd->root_group) + goto out_free; + bfq_init_root_group(bfqd->root_group, bfqd); + bfq_init_entity(&bfqd->oom_bfqq.entity, bfqd->root_group); + + return 0; + +out_free: + kfree(bfqd); + kobject_put(&eq->kobj); + return -ENOMEM; +} + +static void bfq_slab_kill(void) +{ + kmem_cache_destroy(bfq_pool); +} + +static int __init bfq_slab_setup(void) +{ + bfq_pool = KMEM_CACHE(bfq_queue, 0); + if (!bfq_pool) + return -ENOMEM; + return 0; +} + +static ssize_t bfq_var_show(unsigned int var, char *page) +{ + return sprintf(page, "%u\n", var); +} + +static ssize_t bfq_var_store(unsigned long *var, const char *page, + size_t count) +{ + unsigned long new_val; + int ret = kstrtoul(page, 10, &new_val); + + if (ret == 0) + *var = new_val; + + return count; +} + +static ssize_t bfq_wr_max_time_show(struct elevator_queue *e, char *page) +{ + struct bfq_data *bfqd = e->elevator_data; + + return sprintf(page, "%d\n", bfqd->bfq_wr_max_time > 0 ? + jiffies_to_msecs(bfqd->bfq_wr_max_time) : + jiffies_to_msecs(bfq_wr_duration(bfqd))); +} + +static ssize_t bfq_weights_show(struct elevator_queue *e, char *page) +{ + struct bfq_queue *bfqq; + struct bfq_data *bfqd = e->elevator_data; + ssize_t num_char = 0; + + num_char += sprintf(page + num_char, "Tot reqs queued %d\n\n", + bfqd->queued); + + spin_lock_irq(&bfqd->lock); + + num_char += sprintf(page + num_char, "Active:\n"); + list_for_each_entry(bfqq, &bfqd->active_list, bfqq_list) { + num_char += sprintf(page + num_char, + "pid%d: weight %hu, nr_queued %d %d, ", + bfqq->pid, + bfqq->entity.weight, + bfqq->queued[0], + bfqq->queued[1]); + num_char += sprintf(page + num_char, + "dur %d/%u\n", + jiffies_to_msecs( + jiffies - + bfqq->last_wr_start_finish), + jiffies_to_msecs(bfqq->wr_cur_max_time)); + } + + num_char += sprintf(page + num_char, "Idle:\n"); + list_for_each_entry(bfqq, &bfqd->idle_list, bfqq_list) { + num_char += sprintf(page + num_char, + "pid%d: weight %hu, dur %d/%u\n", + bfqq->pid, + bfqq->entity.weight, + jiffies_to_msecs(jiffies - + bfqq->last_wr_start_finish), + jiffies_to_msecs(bfqq->wr_cur_max_time)); + } + + spin_unlock_irq(&bfqd->lock); + + return num_char; +} + +#define SHOW_FUNCTION(__FUNC, __VAR, __CONV) \ +static ssize_t __FUNC(struct elevator_queue *e, char *page) \ +{ \ + struct bfq_data *bfqd = e->elevator_data; \ + u64 __data = __VAR; \ + if (__CONV == 1) \ + __data = jiffies_to_msecs(__data); \ + else if (__CONV == 2) \ + __data = div_u64(__data, NSEC_PER_MSEC); \ + return bfq_var_show(__data, (page)); \ +} +SHOW_FUNCTION(bfq_fifo_expire_sync_show, bfqd->bfq_fifo_expire[1], 2); +SHOW_FUNCTION(bfq_fifo_expire_async_show, bfqd->bfq_fifo_expire[0], 2); +SHOW_FUNCTION(bfq_back_seek_max_show, bfqd->bfq_back_max, 0); +SHOW_FUNCTION(bfq_back_seek_penalty_show, bfqd->bfq_back_penalty, 0); +SHOW_FUNCTION(bfq_slice_idle_show, bfqd->bfq_slice_idle, 2); +SHOW_FUNCTION(bfq_max_budget_show, bfqd->bfq_user_max_budget, 0); +SHOW_FUNCTION(bfq_timeout_sync_show, bfqd->bfq_timeout, 1); +SHOW_FUNCTION(bfq_strict_guarantees_show, bfqd->strict_guarantees, 0); +SHOW_FUNCTION(bfq_low_latency_show, bfqd->low_latency, 0); +SHOW_FUNCTION(bfq_wr_coeff_show, bfqd->bfq_wr_coeff, 0); +SHOW_FUNCTION(bfq_wr_rt_max_time_show, bfqd->bfq_wr_rt_max_time, 1); +SHOW_FUNCTION(bfq_wr_min_idle_time_show, bfqd->bfq_wr_min_idle_time, 1); +SHOW_FUNCTION(bfq_wr_min_inter_arr_async_show, bfqd->bfq_wr_min_inter_arr_async, + 1); +SHOW_FUNCTION(bfq_wr_max_softrt_rate_show, bfqd->bfq_wr_max_softrt_rate, 0); +#undef SHOW_FUNCTION + +#define USEC_SHOW_FUNCTION(__FUNC, __VAR) \ +static ssize_t __FUNC(struct elevator_queue *e, char *page) \ +{ \ + struct bfq_data *bfqd = e->elevator_data; \ + u64 __data = __VAR; \ + __data = div_u64(__data, NSEC_PER_USEC); \ + return bfq_var_show(__data, (page)); \ +} +USEC_SHOW_FUNCTION(bfq_slice_idle_us_show, bfqd->bfq_slice_idle); +#undef USEC_SHOW_FUNCTION + +#define STORE_FUNCTION(__FUNC, __PTR, MIN, MAX, __CONV) \ +static ssize_t \ +__FUNC(struct elevator_queue *e, const char *page, size_t count) \ +{ \ + struct bfq_data *bfqd = e->elevator_data; \ + unsigned long uninitialized_var(__data); \ + int ret = bfq_var_store(&__data, (page), count); \ + if (__data < (MIN)) \ + __data = (MIN); \ + else if (__data > (MAX)) \ + __data = (MAX); \ + if (__CONV == 1) \ + *(__PTR) = msecs_to_jiffies(__data); \ + else if (__CONV == 2) \ + *(__PTR) = (u64)__data * NSEC_PER_MSEC; \ + else \ + *(__PTR) = __data; \ + return ret; \ +} +STORE_FUNCTION(bfq_fifo_expire_sync_store, &bfqd->bfq_fifo_expire[1], 1, + INT_MAX, 2); +STORE_FUNCTION(bfq_fifo_expire_async_store, &bfqd->bfq_fifo_expire[0], 1, + INT_MAX, 2); +STORE_FUNCTION(bfq_back_seek_max_store, &bfqd->bfq_back_max, 0, INT_MAX, 0); +STORE_FUNCTION(bfq_back_seek_penalty_store, &bfqd->bfq_back_penalty, 1, + INT_MAX, 0); +STORE_FUNCTION(bfq_slice_idle_store, &bfqd->bfq_slice_idle, 0, INT_MAX, 2); +STORE_FUNCTION(bfq_wr_coeff_store, &bfqd->bfq_wr_coeff, 1, INT_MAX, 0); +STORE_FUNCTION(bfq_wr_max_time_store, &bfqd->bfq_wr_max_time, 0, INT_MAX, 1); +STORE_FUNCTION(bfq_wr_rt_max_time_store, &bfqd->bfq_wr_rt_max_time, 0, INT_MAX, + 1); +STORE_FUNCTION(bfq_wr_min_idle_time_store, &bfqd->bfq_wr_min_idle_time, 0, + INT_MAX, 1); +STORE_FUNCTION(bfq_wr_min_inter_arr_async_store, + &bfqd->bfq_wr_min_inter_arr_async, 0, INT_MAX, 1); +STORE_FUNCTION(bfq_wr_max_softrt_rate_store, &bfqd->bfq_wr_max_softrt_rate, 0, + INT_MAX, 0); +#undef STORE_FUNCTION + +#define USEC_STORE_FUNCTION(__FUNC, __PTR, MIN, MAX) \ +static ssize_t __FUNC(struct elevator_queue *e, const char *page, size_t count)\ +{ \ + struct bfq_data *bfqd = e->elevator_data; \ + unsigned long uninitialized_var(__data); \ + int ret = bfq_var_store(&__data, (page), count); \ + if (__data < (MIN)) \ + __data = (MIN); \ + else if (__data > (MAX)) \ + __data = (MAX); \ + *(__PTR) = (u64)__data * NSEC_PER_USEC; \ + return ret; \ +} +USEC_STORE_FUNCTION(bfq_slice_idle_us_store, &bfqd->bfq_slice_idle, 0, + UINT_MAX); +#undef USEC_STORE_FUNCTION + +/* do nothing for the moment */ +static ssize_t bfq_weights_store(struct elevator_queue *e, + const char *page, size_t count) +{ + return count; +} + +static ssize_t bfq_max_budget_store(struct elevator_queue *e, + const char *page, size_t count) +{ + struct bfq_data *bfqd = e->elevator_data; + unsigned long uninitialized_var(__data); + int ret = bfq_var_store(&__data, (page), count); + + if (__data == 0) + bfqd->bfq_max_budget = bfq_calc_max_budget(bfqd); + else { + if (__data > INT_MAX) + __data = INT_MAX; + bfqd->bfq_max_budget = __data; + } + + bfqd->bfq_user_max_budget = __data; + + return ret; +} + +/* + * Leaving this name to preserve name compatibility with cfq + * parameters, but this timeout is used for both sync and async. + */ +static ssize_t bfq_timeout_sync_store(struct elevator_queue *e, + const char *page, size_t count) +{ + struct bfq_data *bfqd = e->elevator_data; + unsigned long uninitialized_var(__data); + int ret = bfq_var_store(&__data, (page), count); + + if (__data < 1) + __data = 1; + else if (__data > INT_MAX) + __data = INT_MAX; + + bfqd->bfq_timeout = msecs_to_jiffies(__data); + if (bfqd->bfq_user_max_budget == 0) + bfqd->bfq_max_budget = bfq_calc_max_budget(bfqd); + + return ret; +} + +static ssize_t bfq_strict_guarantees_store(struct elevator_queue *e, + const char *page, size_t count) +{ + struct bfq_data *bfqd = e->elevator_data; + unsigned long uninitialized_var(__data); + int ret = bfq_var_store(&__data, (page), count); + + if (__data > 1) + __data = 1; + if (!bfqd->strict_guarantees && __data == 1 + && bfqd->bfq_slice_idle < 8 * NSEC_PER_MSEC) + bfqd->bfq_slice_idle = 8 * NSEC_PER_MSEC; + + bfqd->strict_guarantees = __data; + + return ret; +} + +static ssize_t bfq_low_latency_store(struct elevator_queue *e, + const char *page, size_t count) +{ + struct bfq_data *bfqd = e->elevator_data; + unsigned long uninitialized_var(__data); + int ret = bfq_var_store(&__data, (page), count); + + if (__data > 1) + __data = 1; + if (__data == 0 && bfqd->low_latency != 0) + bfq_end_wr(bfqd); + bfqd->low_latency = __data; + + return ret; +} + +#define BFQ_ATTR(name) \ + __ATTR(name, S_IRUGO|S_IWUSR, bfq_##name##_show, bfq_##name##_store) + +static struct elv_fs_entry bfq_attrs[] = { + BFQ_ATTR(fifo_expire_sync), + BFQ_ATTR(fifo_expire_async), + BFQ_ATTR(back_seek_max), + BFQ_ATTR(back_seek_penalty), + BFQ_ATTR(slice_idle), + BFQ_ATTR(slice_idle_us), + BFQ_ATTR(max_budget), + BFQ_ATTR(timeout_sync), + BFQ_ATTR(strict_guarantees), + BFQ_ATTR(low_latency), + BFQ_ATTR(wr_coeff), + BFQ_ATTR(wr_max_time), + BFQ_ATTR(wr_rt_max_time), + BFQ_ATTR(wr_min_idle_time), + BFQ_ATTR(wr_min_inter_arr_async), + BFQ_ATTR(wr_max_softrt_rate), + BFQ_ATTR(weights), + __ATTR_NULL +}; + +static struct elevator_type iosched_bfq_mq = { + .ops.mq = { + .prepare_request = bfq_prepare_request, + .finish_request = bfq_finish_request, + .exit_icq = bfq_exit_icq, + .insert_requests = bfq_insert_requests, + .dispatch_request = bfq_dispatch_request, + .next_request = elv_rb_latter_request, + .former_request = elv_rb_former_request, + .allow_merge = bfq_allow_bio_merge, + .bio_merge = bfq_bio_merge, + .request_merge = bfq_request_merge, + .requests_merged = bfq_requests_merged, + .request_merged = bfq_request_merged, + .has_work = bfq_has_work, + .init_sched = bfq_init_queue, + .exit_sched = bfq_exit_queue, + }, + + .uses_mq = true, + .icq_size = sizeof(struct bfq_io_cq), + .icq_align = __alignof__(struct bfq_io_cq), + .elevator_attrs = bfq_attrs, + .elevator_name = "bfq-mq", + .elevator_owner = THIS_MODULE, +}; + +#ifdef BFQ_GROUP_IOSCHED_ENABLED +static struct blkcg_policy blkcg_policy_bfq = { + .dfl_cftypes = bfq_blkg_files, + .legacy_cftypes = bfq_blkcg_legacy_files, + + .cpd_alloc_fn = bfq_cpd_alloc, + .cpd_init_fn = bfq_cpd_init, + .cpd_bind_fn = bfq_cpd_init, + .cpd_free_fn = bfq_cpd_free, + + .pd_alloc_fn = bfq_pd_alloc, + .pd_init_fn = bfq_pd_init, + .pd_offline_fn = bfq_pd_offline, + .pd_free_fn = bfq_pd_free, + .pd_reset_stats_fn = bfq_pd_reset_stats, +}; +#endif + +static int __init bfq_init(void) +{ + int ret; + char msg[60] = "BFQ I/O-scheduler: v8r12"; + +#ifdef BFQ_GROUP_IOSCHED_ENABLED + ret = blkcg_policy_register(&blkcg_policy_bfq); + if (ret) + return ret; +#endif + + ret = -ENOMEM; + if (bfq_slab_setup()) + goto err_pol_unreg; + + /* + * Times to load large popular applications for the typical + * systems installed on the reference devices (see the + * comments before the definitions of the next two + * arrays). Actually, we use slightly slower values, as the + * estimated peak rate tends to be smaller than the actual + * peak rate. The reason for this last fact is that estimates + * are computed over much shorter time intervals than the long + * intervals typically used for benchmarking. Why? First, to + * adapt more quickly to variations. Second, because an I/O + * scheduler cannot rely on a peak-rate-evaluation workload to + * be run for a long time. + */ + T_slow[0] = msecs_to_jiffies(3500); /* actually 4 sec */ + T_slow[1] = msecs_to_jiffies(6000); /* actually 6.5 sec */ + T_fast[0] = msecs_to_jiffies(7000); /* actually 8 sec */ + T_fast[1] = msecs_to_jiffies(2500); /* actually 3 sec */ + + /* + * Thresholds that determine the switch between speed classes + * (see the comments before the definition of the array + * device_speed_thresh). These thresholds are biased towards + * transitions to the fast class. This is safer than the + * opposite bias. In fact, a wrong transition to the slow + * class results in short weight-raising periods, because the + * speed of the device then tends to be higher that the + * reference peak rate. On the opposite end, a wrong + * transition to the fast class tends to increase + * weight-raising periods, because of the opposite reason. + */ + device_speed_thresh[0] = (4 * R_slow[0]) / 3; + device_speed_thresh[1] = (4 * R_slow[1]) / 3; + + ret = elv_register(&iosched_bfq_mq); + if (ret) + goto err_pol_unreg; + +#ifdef BFQ_GROUP_IOSCHED_ENABLED + strcat(msg, " (with cgroups support)"); +#endif + pr_info("%s", msg); + + return 0; + +err_pol_unreg: +#ifdef BFQ_GROUP_IOSCHED_ENABLED + blkcg_policy_unregister(&blkcg_policy_bfq); +#endif + return ret; +} + +static void __exit bfq_exit(void) +{ + elv_unregister(&iosched_bfq_mq); +#ifdef BFQ_GROUP_IOSCHED_ENABLED + blkcg_policy_unregister(&blkcg_policy_bfq); +#endif + bfq_slab_kill(); +} + +module_init(bfq_init); +module_exit(bfq_exit); + +MODULE_AUTHOR("Paolo Valente"); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("MQ Budget Fair Queueing I/O Scheduler"); diff --git a/block/bfq-mq.h b/block/bfq-mq.h new file mode 100644 index 0000000000000000..7ed2cc29be5708b6 --- /dev/null +++ b/block/bfq-mq.h @@ -0,0 +1,987 @@ +/* + * BFQ v8r12 for 4.11.0: data structures and common functions prototypes. + * + * Based on ideas and code from CFQ: + * Copyright (C) 2003 Jens Axboe + * + * Copyright (C) 2008 Fabio Checconi + * Paolo Valente + * + * Copyright (C) 2015 Paolo Valente + * + * Copyright (C) 2017 Paolo Valente + */ + +#ifndef _BFQ_H +#define _BFQ_H + +#include +#include + +/* see comments on CONFIG_BFQ_GROUP_IOSCHED in bfq.h */ +#ifdef CONFIG_MQ_BFQ_GROUP_IOSCHED +#define BFQ_GROUP_IOSCHED_ENABLED +#endif + +#define BFQ_IOPRIO_CLASSES 3 +#define BFQ_CL_IDLE_TIMEOUT (HZ/5) + +#define BFQ_MIN_WEIGHT 1 +#define BFQ_MAX_WEIGHT 1000 +#define BFQ_WEIGHT_CONVERSION_COEFF 10 + +#define BFQ_DEFAULT_QUEUE_IOPRIO 4 + +#define BFQ_WEIGHT_LEGACY_DFL 100 +#define BFQ_DEFAULT_GRP_IOPRIO 0 +#define BFQ_DEFAULT_GRP_CLASS IOPRIO_CLASS_BE + +/* + * Soft real-time applications are extremely more latency sensitive + * than interactive ones. Over-raise the weight of the former to + * privilege them against the latter. + */ +#define BFQ_SOFTRT_WEIGHT_FACTOR 100 + +struct bfq_entity; + +/** + * struct bfq_service_tree - per ioprio_class service tree. + * + * Each service tree represents a B-WF2Q+ scheduler on its own. Each + * ioprio_class has its own independent scheduler, and so its own + * bfq_service_tree. All the fields are protected by the queue lock + * of the containing bfqd. + */ +struct bfq_service_tree { + /* tree for active entities (i.e., those backlogged) */ + struct rb_root active; + /* tree for idle entities (i.e., not backlogged, with V <= F_i)*/ + struct rb_root idle; + + struct bfq_entity *first_idle; /* idle entity with minimum F_i */ + struct bfq_entity *last_idle; /* idle entity with maximum F_i */ + + u64 vtime; /* scheduler virtual time */ + /* scheduler weight sum; active and idle entities contribute to it */ + unsigned long wsum; +}; + +/** + * struct bfq_sched_data - multi-class scheduler. + * + * bfq_sched_data is the basic scheduler queue. It supports three + * ioprio_classes, and can be used either as a toplevel queue or as an + * intermediate queue in a hierarchical setup. + * + * The supported ioprio_classes are the same as in CFQ, in descending + * priority order, IOPRIO_CLASS_RT, IOPRIO_CLASS_BE, IOPRIO_CLASS_IDLE. + * Requests from higher priority queues are served before all the + * requests from lower priority queues; among requests of the same + * queue requests are served according to B-WF2Q+. + * + * The schedule is implemented by the service trees, plus the field + * @next_in_service, which points to the entity on the active trees + * that will be served next, if 1) no changes in the schedule occurs + * before the current in-service entity is expired, 2) the in-service + * queue becomes idle when it expires, and 3) if the entity pointed by + * in_service_entity is not a queue, then the in-service child entity + * of the entity pointed by in_service_entity becomes idle on + * expiration. This peculiar definition allows for the following + * optimization, not yet exploited: while a given entity is still in + * service, we already know which is the best candidate for next + * service among the other active entitities in the same parent + * entity. We can then quickly compare the timestamps of the + * in-service entity with those of such best candidate. + * + * All the fields are protected by the queue lock of the containing + * bfqd. + */ +struct bfq_sched_data { + struct bfq_entity *in_service_entity; /* entity in service */ + /* head-of-the-line entity in the scheduler (see comments above) */ + struct bfq_entity *next_in_service; + /* array of service trees, one per ioprio_class */ + struct bfq_service_tree service_tree[BFQ_IOPRIO_CLASSES]; + /* last time CLASS_IDLE was served */ + unsigned long bfq_class_idle_last_service; + +}; + +/** + * struct bfq_weight_counter - counter of the number of all active entities + * with a given weight. + */ +struct bfq_weight_counter { + unsigned int weight; /* weight of the entities this counter refers to */ + unsigned int num_active; /* nr of active entities with this weight */ + /* + * Weights tree member (see bfq_data's @queue_weights_tree and + * @group_weights_tree) + */ + struct rb_node weights_node; +}; + +/** + * struct bfq_entity - schedulable entity. + * + * A bfq_entity is used to represent either a bfq_queue (leaf node in the + * cgroup hierarchy) or a bfq_group into the upper level scheduler. Each + * entity belongs to the sched_data of the parent group in the cgroup + * hierarchy. Non-leaf entities have also their own sched_data, stored + * in @my_sched_data. + * + * Each entity stores independently its priority values; this would + * allow different weights on different devices, but this + * functionality is not exported to userspace by now. Priorities and + * weights are updated lazily, first storing the new values into the + * new_* fields, then setting the @prio_changed flag. As soon as + * there is a transition in the entity state that allows the priority + * update to take place the effective and the requested priority + * values are synchronized. + * + * Unless cgroups are used, the weight value is calculated from the + * ioprio to export the same interface as CFQ. When dealing with + * ``well-behaved'' queues (i.e., queues that do not spend too much + * time to consume their budget and have true sequential behavior, and + * when there are no external factors breaking anticipation) the + * relative weights at each level of the cgroups hierarchy should be + * guaranteed. All the fields are protected by the queue lock of the + * containing bfqd. + */ +struct bfq_entity { + struct rb_node rb_node; /* service_tree member */ + /* pointer to the weight counter associated with this entity */ + struct bfq_weight_counter *weight_counter; + + /* + * Flag, true if the entity is on a tree (either the active or + * the idle one of its service_tree) or is in service. + */ + bool on_st; + + u64 finish; /* B-WF2Q+ finish timestamp (aka F_i) */ + u64 start; /* B-WF2Q+ start timestamp (aka S_i) */ + + /* tree the entity is enqueued into; %NULL if not on a tree */ + struct rb_root *tree; + + /* + * minimum start time of the (active) subtree rooted at this + * entity; used for O(log N) lookups into active trees + */ + u64 min_start; + + /* amount of service received during the last service slot */ + int service; + + /* budget, used also to calculate F_i: F_i = S_i + @budget / @weight */ + int budget; + + unsigned int weight; /* weight of the queue */ + unsigned int new_weight; /* next weight if a change is in progress */ + + /* original weight, used to implement weight boosting */ + unsigned int orig_weight; + + /* parent entity, for hierarchical scheduling */ + struct bfq_entity *parent; + + /* + * For non-leaf nodes in the hierarchy, the associated + * scheduler queue, %NULL on leaf nodes. + */ + struct bfq_sched_data *my_sched_data; + /* the scheduler queue this entity belongs to */ + struct bfq_sched_data *sched_data; + + /* flag, set to request a weight, ioprio or ioprio_class change */ + int prio_changed; +}; + +struct bfq_group; + +/** + * struct bfq_ttime - per process thinktime stats. + */ +struct bfq_ttime { + u64 last_end_request; /* completion time of last request */ + + u64 ttime_total; /* total process thinktime */ + unsigned long ttime_samples; /* number of thinktime samples */ + u64 ttime_mean; /* average process thinktime */ + +}; + +/** + * struct bfq_queue - leaf schedulable entity. + * + * A bfq_queue is a leaf request queue; it can be associated with an + * io_context or more, if it is async or shared between cooperating + * processes. @cgroup holds a reference to the cgroup, to be sure that it + * does not disappear while a bfqq still references it (mostly to avoid + * races between request issuing and task migration followed by cgroup + * destruction). + * All the fields are protected by the queue lock of the containing bfqd. + */ +struct bfq_queue { + /* reference counter */ + int ref; + /* parent bfq_data */ + struct bfq_data *bfqd; + + /* current ioprio and ioprio class */ + unsigned short ioprio, ioprio_class; + /* next ioprio and ioprio class if a change is in progress */ + unsigned short new_ioprio, new_ioprio_class; + + /* + * Shared bfq_queue if queue is cooperating with one or more + * other queues. + */ + struct bfq_queue *new_bfqq; + /* request-position tree member (see bfq_group's @rq_pos_tree) */ + struct rb_node pos_node; + /* request-position tree root (see bfq_group's @rq_pos_tree) */ + struct rb_root *pos_root; + + /* sorted list of pending requests */ + struct rb_root sort_list; + /* if fifo isn't expired, next request to serve */ + struct request *next_rq; + /* number of sync and async requests queued */ + int queued[2]; + /* number of requests currently allocated */ + int allocated; + /* number of pending metadata requests */ + int meta_pending; + /* fifo list of requests in sort_list */ + struct list_head fifo; + + /* entity representing this queue in the scheduler */ + struct bfq_entity entity; + + /* maximum budget allowed from the feedback mechanism */ + int max_budget; + /* budget expiration (in jiffies) */ + unsigned long budget_timeout; + + /* number of requests on the dispatch list or inside driver */ + int dispatched; + + unsigned int flags; /* status flags.*/ + + /* node for active/idle bfqq list inside parent bfqd */ + struct list_head bfqq_list; + + /* associated @bfq_ttime struct */ + struct bfq_ttime ttime; + + /* bit vector: a 1 for each seeky requests in history */ + u32 seek_history; + + /* node for the device's burst list */ + struct hlist_node burst_list_node; + + /* position of the last request enqueued */ + sector_t last_request_pos; + + /* Number of consecutive pairs of request completion and + * arrival, such that the queue becomes idle after the + * completion, but the next request arrives within an idle + * time slice; used only if the queue's IO_bound flag has been + * cleared. + */ + unsigned int requests_within_timer; + + /* pid of the process owning the queue, used for logging purposes */ + pid_t pid; + + /* + * Pointer to the bfq_io_cq owning the bfq_queue, set to %NULL + * if the queue is shared. + */ + struct bfq_io_cq *bic; + + /* current maximum weight-raising time for this queue */ + unsigned long wr_cur_max_time; + /* + * Minimum time instant such that, only if a new request is + * enqueued after this time instant in an idle @bfq_queue with + * no outstanding requests, then the task associated with the + * queue it is deemed as soft real-time (see the comments on + * the function bfq_bfqq_softrt_next_start()) + */ + unsigned long soft_rt_next_start; + /* + * Start time of the current weight-raising period if + * the @bfq-queue is being weight-raised, otherwise + * finish time of the last weight-raising period. + */ + unsigned long last_wr_start_finish; + /* factor by which the weight of this queue is multiplied */ + unsigned int wr_coeff; + /* + * Time of the last transition of the @bfq_queue from idle to + * backlogged. + */ + unsigned long last_idle_bklogged; + /* + * Cumulative service received from the @bfq_queue since the + * last transition from idle to backlogged. + */ + unsigned long service_from_backlogged; + /* + * Value of wr start time when switching to soft rt + */ + unsigned long wr_start_at_switch_to_srt; + + unsigned long split_time; /* time of last split */ +}; + +/** + * struct bfq_io_cq - per (request_queue, io_context) structure. + */ +struct bfq_io_cq { + /* associated io_cq structure */ + struct io_cq icq; /* must be the first member */ + /* array of two process queues, the sync and the async */ + struct bfq_queue *bfqq[2]; + /* per (request_queue, blkcg) ioprio */ + int ioprio; +#ifdef BFQ_GROUP_IOSCHED_ENABLED + uint64_t blkcg_serial_nr; /* the current blkcg serial */ +#endif + + /* + * Snapshot of the has_short_time flag before merging; taken + * to remember its value while the queue is merged, so as to + * be able to restore it in case of split. + */ + bool saved_has_short_ttime; + /* + * Same purpose as the previous two fields for the I/O bound + * classification of a queue. + */ + bool saved_IO_bound; + + /* + * Same purpose as the previous fields for the value of the + * field keeping the queue's belonging to a large burst + */ + bool saved_in_large_burst; + /* + * True if the queue belonged to a burst list before its merge + * with another cooperating queue. + */ + bool was_in_burst_list; + + /* + * Similar to previous fields: save wr information. + */ + unsigned long saved_wr_coeff; + unsigned long saved_last_wr_start_finish; + unsigned long saved_wr_start_at_switch_to_srt; + unsigned int saved_wr_cur_max_time; + struct bfq_ttime saved_ttime; +}; + +enum bfq_device_speed { + BFQ_BFQD_FAST, + BFQ_BFQD_SLOW, +}; + +/** + * struct bfq_data - per-device data structure. + * + * All the fields are protected by @lock. + */ +struct bfq_data { + /* device request queue */ + struct request_queue *queue; + /* dispatch queue */ + struct list_head dispatch; + + /* root bfq_group for the device */ + struct bfq_group *root_group; + + /* + * rbtree of weight counters of @bfq_queues, sorted by + * weight. Used to keep track of whether all @bfq_queues have + * the same weight. The tree contains one counter for each + * distinct weight associated to some active and not + * weight-raised @bfq_queue (see the comments to the functions + * bfq_weights_tree_[add|remove] for further details). + */ + struct rb_root queue_weights_tree; + /* + * rbtree of non-queue @bfq_entity weight counters, sorted by + * weight. Used to keep track of whether all @bfq_groups have + * the same weight. The tree contains one counter for each + * distinct weight associated to some active @bfq_group (see + * the comments to the functions bfq_weights_tree_[add|remove] + * for further details). + */ + struct rb_root group_weights_tree; + + /* + * Number of bfq_queues containing requests (including the + * queue in service, even if it is idling). + */ + int busy_queues; + /* number of weight-raised busy @bfq_queues */ + int wr_busy_queues; + /* number of queued requests */ + int queued; + /* number of requests dispatched and waiting for completion */ + int rq_in_driver; + + /* + * Maximum number of requests in driver in the last + * @hw_tag_samples completed requests. + */ + int max_rq_in_driver; + /* number of samples used to calculate hw_tag */ + int hw_tag_samples; + /* flag set to one if the driver is showing a queueing behavior */ + int hw_tag; + + /* number of budgets assigned */ + int budgets_assigned; + + /* + * Timer set when idling (waiting) for the next request from + * the queue in service. + */ + struct hrtimer idle_slice_timer; + + /* bfq_queue in service */ + struct bfq_queue *in_service_queue; + + /* on-disk position of the last served request */ + sector_t last_position; + + /* time of last request completion (ns) */ + u64 last_completion; + + /* time of first rq dispatch in current observation interval (ns) */ + u64 first_dispatch; + /* time of last rq dispatch in current observation interval (ns) */ + u64 last_dispatch; + + /* beginning of the last budget */ + ktime_t last_budget_start; + /* beginning of the last idle slice */ + ktime_t last_idling_start; + + /* number of samples in current observation interval */ + int peak_rate_samples; + /* num of samples of seq dispatches in current observation interval */ + u32 sequential_samples; + /* total num of sectors transferred in current observation interval */ + u64 tot_sectors_dispatched; + /* max rq size seen during current observation interval (sectors) */ + u32 last_rq_max_size; + /* time elapsed from first dispatch in current observ. interval (us) */ + u64 delta_from_first; + /* current estimate of device peak rate */ + u32 peak_rate; + + /* maximum budget allotted to a bfq_queue before rescheduling */ + int bfq_max_budget; + + /* list of all the bfq_queues active on the device */ + struct list_head active_list; + /* list of all the bfq_queues idle on the device */ + struct list_head idle_list; + + /* + * Timeout for async/sync requests; when it fires, requests + * are served in fifo order. + */ + u64 bfq_fifo_expire[2]; + /* weight of backward seeks wrt forward ones */ + unsigned int bfq_back_penalty; + /* maximum allowed backward seek */ + unsigned int bfq_back_max; + /* maximum idling time */ + u32 bfq_slice_idle; + + /* user-configured max budget value (0 for auto-tuning) */ + int bfq_user_max_budget; + /* + * Timeout for bfq_queues to consume their budget; used to + * prevent seeky queues from imposing long latencies to + * sequential or quasi-sequential ones (this also implies that + * seeky queues cannot receive guarantees in the service + * domain; after a timeout they are charged for the time they + * have been in service, to preserve fairness among them, but + * without service-domain guarantees). + */ + unsigned int bfq_timeout; + + /* + * Number of consecutive requests that must be issued within + * the idle time slice to set again idling to a queue which + * was marked as non-I/O-bound (see the definition of the + * IO_bound flag for further details). + */ + unsigned int bfq_requests_within_timer; + + /* + * Force device idling whenever needed to provide accurate + * service guarantees, without caring about throughput + * issues. CAVEAT: this may even increase latencies, in case + * of useless idling for processes that did stop doing I/O. + */ + bool strict_guarantees; + + /* + * Last time at which a queue entered the current burst of + * queues being activated shortly after each other; for more + * details about this and the following parameters related to + * a burst of activations, see the comments on the function + * bfq_handle_burst. + */ + unsigned long last_ins_in_burst; + /* + * Reference time interval used to decide whether a queue has + * been activated shortly after @last_ins_in_burst. + */ + unsigned long bfq_burst_interval; + /* number of queues in the current burst of queue activations */ + int burst_size; + + /* common parent entity for the queues in the burst */ + struct bfq_entity *burst_parent_entity; + /* Maximum burst size above which the current queue-activation + * burst is deemed as 'large'. + */ + unsigned long bfq_large_burst_thresh; + /* true if a large queue-activation burst is in progress */ + bool large_burst; + /* + * Head of the burst list (as for the above fields, more + * details in the comments on the function bfq_handle_burst). + */ + struct hlist_head burst_list; + + /* if set to true, low-latency heuristics are enabled */ + bool low_latency; + /* + * Maximum factor by which the weight of a weight-raised queue + * is multiplied. + */ + unsigned int bfq_wr_coeff; + /* maximum duration of a weight-raising period (jiffies) */ + unsigned int bfq_wr_max_time; + + /* Maximum weight-raising duration for soft real-time processes */ + unsigned int bfq_wr_rt_max_time; + /* + * Minimum idle period after which weight-raising may be + * reactivated for a queue (in jiffies). + */ + unsigned int bfq_wr_min_idle_time; + /* + * Minimum period between request arrivals after which + * weight-raising may be reactivated for an already busy async + * queue (in jiffies). + */ + unsigned long bfq_wr_min_inter_arr_async; + + /* Max service-rate for a soft real-time queue, in sectors/sec */ + unsigned int bfq_wr_max_softrt_rate; + /* + * Cached value of the product R*T, used for computing the + * maximum duration of weight raising automatically. + */ + u64 RT_prod; + /* device-speed class for the low-latency heuristic */ + enum bfq_device_speed device_speed; + + /* fallback dummy bfqq for extreme OOM conditions */ + struct bfq_queue oom_bfqq; + + spinlock_t lock; + + /* + * bic associated with the task issuing current bio for + * merging. This and the next field are used as a support to + * be able to perform the bic lookup, needed by bio-merge + * functions, before the scheduler lock is taken, and thus + * avoid taking the request-queue lock while the scheduler + * lock is being held. + */ + struct bfq_io_cq *bio_bic; + /* bfqq associated with the task issuing current bio for merging */ + struct bfq_queue *bio_bfqq; + /* Extra flag used only for TESTING */ + bool bio_bfqq_set; +}; + +enum bfqq_state_flags { + BFQ_BFQQ_FLAG_just_created = 0, /* queue just allocated */ + BFQ_BFQQ_FLAG_busy, /* has requests or is in service */ + BFQ_BFQQ_FLAG_wait_request, /* waiting for a request */ + BFQ_BFQQ_FLAG_non_blocking_wait_rq, /* + * waiting for a request + * without idling the device + */ + BFQ_BFQQ_FLAG_fifo_expire, /* FIFO checked in this slice */ + BFQ_BFQQ_FLAG_has_short_ttime, /* queue has a short think time */ + BFQ_BFQQ_FLAG_sync, /* synchronous queue */ + BFQ_BFQQ_FLAG_IO_bound, /* + * bfqq has timed-out at least once + * having consumed at most 2/10 of + * its budget + */ + BFQ_BFQQ_FLAG_in_large_burst, /* + * bfqq activated in a large burst, + * see comments to bfq_handle_burst. + */ + BFQ_BFQQ_FLAG_softrt_update, /* + * may need softrt-next-start + * update + */ + BFQ_BFQQ_FLAG_coop, /* bfqq is shared */ + BFQ_BFQQ_FLAG_split_coop /* shared bfqq will be split */ +}; + +#define BFQ_BFQQ_FNS(name) \ +static void bfq_mark_bfqq_##name(struct bfq_queue *bfqq) \ +{ \ + (bfqq)->flags |= (1 << BFQ_BFQQ_FLAG_##name); \ +} \ +static void bfq_clear_bfqq_##name(struct bfq_queue *bfqq) \ +{ \ + (bfqq)->flags &= ~(1 << BFQ_BFQQ_FLAG_##name); \ +} \ +static int bfq_bfqq_##name(const struct bfq_queue *bfqq) \ +{ \ + return ((bfqq)->flags & (1 << BFQ_BFQQ_FLAG_##name)) != 0; \ +} + +BFQ_BFQQ_FNS(just_created); +BFQ_BFQQ_FNS(busy); +BFQ_BFQQ_FNS(wait_request); +BFQ_BFQQ_FNS(non_blocking_wait_rq); +BFQ_BFQQ_FNS(fifo_expire); +BFQ_BFQQ_FNS(has_short_ttime); +BFQ_BFQQ_FNS(sync); +BFQ_BFQQ_FNS(IO_bound); +BFQ_BFQQ_FNS(in_large_burst); +BFQ_BFQQ_FNS(coop); +BFQ_BFQQ_FNS(split_coop); +BFQ_BFQQ_FNS(softrt_update); +#undef BFQ_BFQQ_FNS + +/* Logging facilities. */ +#ifdef CONFIG_BFQ_REDIRECT_TO_CONSOLE + +static const char *checked_dev_name(const struct device *dev) +{ + static const char nodev[] = "nodev"; + + if (dev) + return dev_name(dev); + + return nodev; +} + +#ifdef BFQ_GROUP_IOSCHED_ENABLED +static struct bfq_group *bfqq_group(struct bfq_queue *bfqq); +static struct blkcg_gq *bfqg_to_blkg(struct bfq_group *bfqg); + +#define bfq_log_bfqq(bfqd, bfqq, fmt, args...) do { \ + pr_crit("%s bfq%d%c %s " fmt "\n", \ + checked_dev_name((bfqd)->queue->backing_dev_info->dev), \ + (bfqq)->pid, \ + bfq_bfqq_sync((bfqq)) ? 'S' : 'A', \ + bfqq_group(bfqq)->blkg_path, ##args); \ +} while (0) + +#define bfq_log_bfqg(bfqd, bfqg, fmt, args...) do { \ + pr_crit("%s %s " fmt "\n", \ + checked_dev_name((bfqd)->queue->backing_dev_info->dev), \ + bfqg->blkg_path, ##args); \ +} while (0) + +#else /* BFQ_GROUP_IOSCHED_ENABLED */ + +#define bfq_log_bfqq(bfqd, bfqq, fmt, args...) \ + pr_crit("%s bfq%d%c " fmt "\n", \ + checked_dev_name((bfqd)->queue->backing_dev_info->dev), \ + (bfqq)->pid, bfq_bfqq_sync((bfqq)) ? 'S' : 'A', \ + ##args) +#define bfq_log_bfqg(bfqd, bfqg, fmt, args...) do {} while (0) + +#endif /* BFQ_GROUP_IOSCHED_ENABLED */ + +#define bfq_log(bfqd, fmt, args...) \ + pr_crit("%s bfq " fmt "\n", \ + checked_dev_name((bfqd)->queue->backing_dev_info->dev), \ + ##args) + +#else /* CONFIG_BFQ_REDIRECT_TO_CONSOLE */ + +#if !defined(CONFIG_BLK_DEV_IO_TRACE) + +/* Avoid possible "unused-variable" warning. See commit message. */ + +#define bfq_log_bfqq(bfqd, bfqq, fmt, args...) ((void) (bfqq)) + +#define bfq_log_bfqg(bfqd, bfqg, fmt, args...) ((void) (bfqg)) + +#define bfq_log(bfqd, fmt, args...) do {} while (0) + +#else /* CONFIG_BLK_DEV_IO_TRACE */ + +#include + +#ifdef BFQ_GROUP_IOSCHED_ENABLED +static struct bfq_group *bfqq_group(struct bfq_queue *bfqq); +static struct blkcg_gq *bfqg_to_blkg(struct bfq_group *bfqg); + +#define bfq_log_bfqq(bfqd, bfqq, fmt, args...) do { \ + blk_add_trace_msg((bfqd)->queue, "bfq%d%c %s " fmt, \ + (bfqq)->pid, \ + bfq_bfqq_sync((bfqq)) ? 'S' : 'A', \ + bfqq_group(bfqq)->blkg_path, ##args); \ +} while (0) + +#define bfq_log_bfqg(bfqd, bfqg, fmt, args...) do { \ + blk_add_trace_msg((bfqd)->queue, "%s " fmt, bfqg->blkg_path, ##args);\ +} while (0) + +#else /* BFQ_GROUP_IOSCHED_ENABLED */ + +#define bfq_log_bfqq(bfqd, bfqq, fmt, args...) \ + blk_add_trace_msg((bfqd)->queue, "bfq%d%c " fmt, (bfqq)->pid, \ + bfq_bfqq_sync((bfqq)) ? 'S' : 'A', \ + ##args) +#define bfq_log_bfqg(bfqd, bfqg, fmt, args...) do {} while (0) + +#endif /* BFQ_GROUP_IOSCHED_ENABLED */ + +#define bfq_log(bfqd, fmt, args...) \ + blk_add_trace_msg((bfqd)->queue, "bfq " fmt, ##args) + +#endif /* CONFIG_BLK_DEV_IO_TRACE */ +#endif /* CONFIG_BFQ_REDIRECT_TO_CONSOLE */ + +/* Expiration reasons. */ +enum bfqq_expiration { + BFQ_BFQQ_TOO_IDLE = 0, /* + * queue has been idling for + * too long + */ + BFQ_BFQQ_BUDGET_TIMEOUT, /* budget took too long to be used */ + BFQ_BFQQ_BUDGET_EXHAUSTED, /* budget consumed */ + BFQ_BFQQ_NO_MORE_REQUESTS, /* the queue has no more requests */ + BFQ_BFQQ_PREEMPTED /* preemption in progress */ +}; + + +struct bfqg_stats { +#ifdef BFQ_GROUP_IOSCHED_ENABLED + /* number of ios merged */ + struct blkg_rwstat merged; + /* total time spent on device in ns, may not be accurate w/ queueing */ + struct blkg_rwstat service_time; + /* total time spent waiting in scheduler queue in ns */ + struct blkg_rwstat wait_time; + /* number of IOs queued up */ + struct blkg_rwstat queued; + /* total disk time and nr sectors dispatched by this group */ + struct blkg_stat time; + /* sum of number of ios queued across all samples */ + struct blkg_stat avg_queue_size_sum; + /* count of samples taken for average */ + struct blkg_stat avg_queue_size_samples; + /* how many times this group has been removed from service tree */ + struct blkg_stat dequeue; + /* total time spent waiting for it to be assigned a timeslice. */ + struct blkg_stat group_wait_time; + /* time spent idling for this blkcg_gq */ + struct blkg_stat idle_time; + /* total time with empty current active q with other requests queued */ + struct blkg_stat empty_time; + /* fields after this shouldn't be cleared on stat reset */ + uint64_t start_group_wait_time; + uint64_t start_idle_time; + uint64_t start_empty_time; + uint16_t flags; +#endif +}; + +#ifdef BFQ_GROUP_IOSCHED_ENABLED +/* + * struct bfq_group_data - per-blkcg storage for the blkio subsystem. + * + * @ps: @blkcg_policy_storage that this structure inherits + * @weight: weight of the bfq_group + */ +struct bfq_group_data { + /* must be the first member */ + struct blkcg_policy_data pd; + + unsigned int weight; +}; + +/** + * struct bfq_group - per (device, cgroup) data structure. + * @entity: schedulable entity to insert into the parent group sched_data. + * @sched_data: own sched_data, to contain child entities (they may be + * both bfq_queues and bfq_groups). + * @bfqd: the bfq_data for the device this group acts upon. + * @async_bfqq: array of async queues for all the tasks belonging to + * the group, one queue per ioprio value per ioprio_class, + * except for the idle class that has only one queue. + * @async_idle_bfqq: async queue for the idle class (ioprio is ignored). + * @my_entity: pointer to @entity, %NULL for the toplevel group; used + * to avoid too many special cases during group creation/ + * migration. + * @active_entities: number of active entities belonging to the group; + * unused for the root group. Used to know whether there + * are groups with more than one active @bfq_entity + * (see the comments to the function + * bfq_bfqq_may_idle()). + * @rq_pos_tree: rbtree sorted by next_request position, used when + * determining if two or more queues have interleaving + * requests (see bfq_find_close_cooperator()). + * + * Each (device, cgroup) pair has its own bfq_group, i.e., for each cgroup + * there is a set of bfq_groups, each one collecting the lower-level + * entities belonging to the group that are acting on the same device. + * + * Locking works as follows: + * o @bfqd is protected by the queue lock, RCU is used to access it + * from the readers. + * o All the other fields are protected by the @bfqd queue lock. + */ +struct bfq_group { + /* must be the first member */ + struct blkg_policy_data pd; + + /* cached path for this blkg (see comments in bfq_bic_update_cgroup) */ + char blkg_path[128]; + + /* reference counter (see comments in bfq_bic_update_cgroup) */ + int ref; + + struct bfq_entity entity; + struct bfq_sched_data sched_data; + + void *bfqd; + + struct bfq_queue *async_bfqq[2][IOPRIO_BE_NR]; + struct bfq_queue *async_idle_bfqq; + + struct bfq_entity *my_entity; + + int active_entities; + + struct rb_root rq_pos_tree; + + struct bfqg_stats stats; +}; + +#else +struct bfq_group { + struct bfq_sched_data sched_data; + + struct bfq_queue *async_bfqq[2][IOPRIO_BE_NR]; + struct bfq_queue *async_idle_bfqq; + + struct rb_root rq_pos_tree; +}; +#endif + +static struct bfq_queue *bfq_entity_to_bfqq(struct bfq_entity *entity); + +static unsigned int bfq_class_idx(struct bfq_entity *entity) +{ + struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); + + return bfqq ? bfqq->ioprio_class - 1 : + BFQ_DEFAULT_GRP_CLASS - 1; +} + +static struct bfq_service_tree * +bfq_entity_service_tree(struct bfq_entity *entity) +{ + struct bfq_sched_data *sched_data = entity->sched_data; + struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); + unsigned int idx = bfq_class_idx(entity); + + BUG_ON(idx >= BFQ_IOPRIO_CLASSES); + BUG_ON(sched_data == NULL); + + if (bfqq) + bfq_log_bfqq(bfqq->bfqd, bfqq, + "entity_service_tree %p %d", + sched_data->service_tree + idx, idx); +#ifdef BFQ_GROUP_IOSCHED_ENABLED + else { + struct bfq_group *bfqg = + container_of(entity, struct bfq_group, entity); + + bfq_log_bfqg((struct bfq_data *)bfqg->bfqd, bfqg, + "entity_service_tree %p %d", + sched_data->service_tree + idx, idx); + } +#endif + return sched_data->service_tree + idx; +} + +static struct bfq_queue *bic_to_bfqq(struct bfq_io_cq *bic, bool is_sync) +{ + return bic->bfqq[is_sync]; +} + +static void bic_set_bfqq(struct bfq_io_cq *bic, struct bfq_queue *bfqq, + bool is_sync) +{ + bic->bfqq[is_sync] = bfqq; +} + +static struct bfq_data *bic_to_bfqd(struct bfq_io_cq *bic) +{ + return bic->icq.q->elevator->elevator_data; +} + +#ifdef BFQ_GROUP_IOSCHED_ENABLED + +static struct bfq_group *bfq_bfqq_to_bfqg(struct bfq_queue *bfqq) +{ + struct bfq_entity *group_entity = bfqq->entity.parent; + + if (!group_entity) + group_entity = &bfqq->bfqd->root_group->entity; + + return container_of(group_entity, struct bfq_group, entity); +} + +#else + +static struct bfq_group *bfq_bfqq_to_bfqg(struct bfq_queue *bfqq) +{ + return bfqq->bfqd->root_group; +} + +#endif + +static void bfq_check_ioprio_change(struct bfq_io_cq *bic, struct bio *bio); +static void bfq_put_queue(struct bfq_queue *bfqq); +static struct bfq_queue *bfq_get_queue(struct bfq_data *bfqd, + struct bio *bio, bool is_sync, + struct bfq_io_cq *bic); +static void bfq_end_wr_async_queues(struct bfq_data *bfqd, + struct bfq_group *bfqg); +#ifdef BFQ_GROUP_IOSCHED_ENABLED +static void bfq_put_async_queues(struct bfq_data *bfqd, struct bfq_group *bfqg); +#endif +static void bfq_exit_bfqq(struct bfq_data *bfqd, struct bfq_queue *bfqq); + +#endif /* _BFQ_H */ diff --git a/block/bfq-sched.c b/block/bfq-sched.c new file mode 100644 index 0000000000000000..e4a2553a2d2cd8f2 --- /dev/null +++ b/block/bfq-sched.c @@ -0,0 +1,2057 @@ +/* + * BFQ: Hierarchical B-WF2Q+ scheduler. + * + * Based on ideas and code from CFQ: + * Copyright (C) 2003 Jens Axboe + * + * Copyright (C) 2008 Fabio Checconi + * Paolo Valente + * + * Copyright (C) 2015 Paolo Valente + * + * Copyright (C) 2016 Paolo Valente + */ + +static struct bfq_group *bfqq_group(struct bfq_queue *bfqq); + +/** + * bfq_gt - compare two timestamps. + * @a: first ts. + * @b: second ts. + * + * Return @a > @b, dealing with wrapping correctly. + */ +static int bfq_gt(u64 a, u64 b) +{ + return (s64)(a - b) > 0; +} + +static struct bfq_entity *bfq_root_active_entity(struct rb_root *tree) +{ + struct rb_node *node = tree->rb_node; + + return rb_entry(node, struct bfq_entity, rb_node); +} + +static struct bfq_entity *bfq_lookup_next_entity(struct bfq_sched_data *sd, + bool expiration); + +static bool bfq_update_parent_budget(struct bfq_entity *next_in_service); + +/** + * bfq_update_next_in_service - update sd->next_in_service + * @sd: sched_data for which to perform the update. + * @new_entity: if not NULL, pointer to the entity whose activation, + * requeueing or repositionig triggered the invocation of + * this function. + * @expiration: id true, this function is being invoked after the + * expiration of the in-service entity + * + * This function is called to update sd->next_in_service, which, in + * its turn, may change as a consequence of the insertion or + * extraction of an entity into/from one of the active trees of + * sd. These insertions/extractions occur as a consequence of + * activations/deactivations of entities, with some activations being + * 'true' activations, and other activations being requeueings (i.e., + * implementing the second, requeueing phase of the mechanism used to + * reposition an entity in its active tree; see comments on + * __bfq_activate_entity and __bfq_requeue_entity for details). In + * both the last two activation sub-cases, new_entity points to the + * just activated or requeued entity. + * + * Returns true if sd->next_in_service changes in such a way that + * entity->parent may become the next_in_service for its parent + * entity. + */ +static bool bfq_update_next_in_service(struct bfq_sched_data *sd, + struct bfq_entity *new_entity, + bool expiration) +{ + struct bfq_entity *next_in_service = sd->next_in_service; + struct bfq_queue *bfqq; + bool parent_sched_may_change = false; + bool change_without_lookup = false; + + /* + * If this update is triggered by the activation, requeueing + * or repositiong of an entity that does not coincide with + * sd->next_in_service, then a full lookup in the active tree + * can be avoided. In fact, it is enough to check whether the + * just-modified entity has the same priority as + * sd->next_in_service, is eligible and has a lower virtual + * finish time than sd->next_in_service. If this compound + * condition holds, then the new entity becomes the new + * next_in_service. Otherwise no change is needed. + */ + if (new_entity && new_entity != sd->next_in_service) { + /* + * Flag used to decide whether to replace + * sd->next_in_service with new_entity. Tentatively + * set to true, and left as true if + * sd->next_in_service is NULL. + */ + change_without_lookup = true; + + /* + * If there is already a next_in_service candidate + * entity, then compare timestamps to decide whether + * to replace sd->service_tree with new_entity. + */ + if (next_in_service) { + unsigned int new_entity_class_idx = + bfq_class_idx(new_entity); + struct bfq_service_tree *st = + sd->service_tree + new_entity_class_idx; + + change_without_lookup = + (new_entity_class_idx == + bfq_class_idx(next_in_service) + && + !bfq_gt(new_entity->start, st->vtime) + && + bfq_gt(next_in_service->finish, + new_entity->finish)); + } + + if (change_without_lookup) { + next_in_service = new_entity; + bfqq = bfq_entity_to_bfqq(next_in_service); + + if (bfqq) + bfq_log_bfqq(bfqq->bfqd, bfqq, + "update_next_in_service: chose without lookup"); +#ifdef BFQ_GROUP_IOSCHED_ENABLED + else { + struct bfq_group *bfqg = + container_of(next_in_service, + struct bfq_group, entity); + + bfq_log_bfqg((struct bfq_data*)bfqg->bfqd, bfqg, + "update_next_in_service: chose without lookup"); + } +#endif + } + } + + if (!change_without_lookup) /* lookup needed */ + next_in_service = bfq_lookup_next_entity(sd, expiration); + + if (next_in_service) + parent_sched_may_change = !sd->next_in_service || + bfq_update_parent_budget(next_in_service); + + sd->next_in_service = next_in_service; + + if (!next_in_service) + return parent_sched_may_change; + + bfqq = bfq_entity_to_bfqq(next_in_service); + if (bfqq) + bfq_log_bfqq(bfqq->bfqd, bfqq, + "update_next_in_service: chosen this queue"); +#ifdef BFQ_GROUP_IOSCHED_ENABLED + else { + struct bfq_group *bfqg = + container_of(next_in_service, + struct bfq_group, entity); + + bfq_log_bfqg((struct bfq_data *)bfqg->bfqd, bfqg, + "update_next_in_service: chosen this entity"); + } +#endif + return parent_sched_may_change; +} + +#ifdef BFQ_GROUP_IOSCHED_ENABLED +/* both next loops stop at one of the child entities of the root group */ +#define for_each_entity(entity) \ + for (; entity ; entity = entity->parent) + +/* + * For each iteration, compute parent in advance, so as to be safe if + * entity is deallocated during the iteration. Such a deallocation may + * happen as a consequence of a bfq_put_queue that frees the bfq_queue + * containing entity. + */ +#define for_each_entity_safe(entity, parent) \ + for (; entity && ({ parent = entity->parent; 1; }); entity = parent) + +/* + * Returns true if this budget changes may let next_in_service->parent + * become the next_in_service entity for its parent entity. + */ +static bool bfq_update_parent_budget(struct bfq_entity *next_in_service) +{ + struct bfq_entity *bfqg_entity; + struct bfq_group *bfqg; + struct bfq_sched_data *group_sd; + bool ret = false; + + BUG_ON(!next_in_service); + + group_sd = next_in_service->sched_data; + + bfqg = container_of(group_sd, struct bfq_group, sched_data); + /* + * bfq_group's my_entity field is not NULL only if the group + * is not the root group. We must not touch the root entity + * as it must never become an in-service entity. + */ + bfqg_entity = bfqg->my_entity; + if (bfqg_entity) { + if (bfqg_entity->budget > next_in_service->budget) + ret = true; + bfqg_entity->budget = next_in_service->budget; + } + + return ret; +} + +/* + * This function tells whether entity stops being a candidate for next + * service, according to the restrictive definition of the field + * next_in_service. In particular, this function is invoked for an + * entity that is about to be set in service. + * + * If entity is a queue, then the entity is no longer a candidate for + * next service according to the that definition, because entity is + * about to become the in-service queue. This function then returns + * true if entity is a queue. + * + * In contrast, entity could still be a candidate for next service if + * it is not a queue, and has more than one active child. In fact, + * even if one of its children is about to be set in service, other + * active children may still be the next to serve, for the parent + * entity, even according to the above definition. As a consequence, a + * non-queue entity is not a candidate for next-service only if it has + * only one active child. And only if this condition holds, then this + * function returns true for a non-queue entity. + */ +static bool bfq_no_longer_next_in_service(struct bfq_entity *entity) +{ + struct bfq_group *bfqg; + + if (bfq_entity_to_bfqq(entity)) + return true; + + bfqg = container_of(entity, struct bfq_group, entity); + + BUG_ON(bfqg == ((struct bfq_data *)(bfqg->bfqd))->root_group); + BUG_ON(bfqg->active_entities == 0); + /* + * The field active_entities does not always contain the + * actual number of active children entities: it happens to + * not account for the in-service entity in case the latter is + * removed from its active tree (which may get done after + * invoking the function bfq_no_longer_next_in_service in + * bfq_get_next_queue). Fortunately, here, i.e., while + * bfq_no_longer_next_in_service is not yet completed in + * bfq_get_next_queue, bfq_active_extract has not yet been + * invoked, and thus active_entities still coincides with the + * actual number of active entities. + */ + if (bfqg->active_entities == 1) + return true; + + return false; +} + +#else /* BFQ_GROUP_IOSCHED_ENABLED */ +#define for_each_entity(entity) \ + for (; entity ; entity = NULL) + +#define for_each_entity_safe(entity, parent) \ + for (parent = NULL; entity ; entity = parent) + +static bool bfq_update_parent_budget(struct bfq_entity *next_in_service) +{ + return false; +} + +static bool bfq_no_longer_next_in_service(struct bfq_entity *entity) +{ + return true; +} + +#endif /* BFQ_GROUP_IOSCHED_ENABLED */ + +/* + * Shift for timestamp calculations. This actually limits the maximum + * service allowed in one timestamp delta (small shift values increase it), + * the maximum total weight that can be used for the queues in the system + * (big shift values increase it), and the period of virtual time + * wraparounds. + */ +#define WFQ_SERVICE_SHIFT 22 + +static struct bfq_queue *bfq_entity_to_bfqq(struct bfq_entity *entity) +{ + struct bfq_queue *bfqq = NULL; + + BUG_ON(!entity); + + if (!entity->my_sched_data) + bfqq = container_of(entity, struct bfq_queue, entity); + + return bfqq; +} + + +/** + * bfq_delta - map service into the virtual time domain. + * @service: amount of service. + * @weight: scale factor (weight of an entity or weight sum). + */ +static u64 bfq_delta(unsigned long service, unsigned long weight) +{ + u64 d = (u64)service << WFQ_SERVICE_SHIFT; + + do_div(d, weight); + return d; +} + +/** + * bfq_calc_finish - assign the finish time to an entity. + * @entity: the entity to act upon. + * @service: the service to be charged to the entity. + */ +static void bfq_calc_finish(struct bfq_entity *entity, unsigned long service) +{ + struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); + unsigned long long start, finish, delta; + + BUG_ON(entity->weight == 0); + + entity->finish = entity->start + + bfq_delta(service, entity->weight); + + start = ((entity->start>>10)*1000)>>12; + finish = ((entity->finish>>10)*1000)>>12; + delta = ((bfq_delta(service, entity->weight)>>10)*1000)>>12; + + if (bfqq) { + bfq_log_bfqq(bfqq->bfqd, bfqq, + "calc_finish: serv %lu, w %d", + service, entity->weight); + bfq_log_bfqq(bfqq->bfqd, bfqq, + "calc_finish: start %llu, finish %llu, delta %llu", + start, finish, delta); +#ifdef BFQ_GROUP_IOSCHED_ENABLED + } else { + struct bfq_group *bfqg = + container_of(entity, struct bfq_group, entity); + + bfq_log_bfqg((struct bfq_data *)bfqg->bfqd, bfqg, + "calc_finish group: serv %lu, w %d", + service, entity->weight); + bfq_log_bfqg((struct bfq_data *)bfqg->bfqd, bfqg, + "calc_finish group: start %llu, finish %llu, delta %llu", + start, finish, delta); +#endif + } +} + +/** + * bfq_entity_of - get an entity from a node. + * @node: the node field of the entity. + * + * Convert a node pointer to the relative entity. This is used only + * to simplify the logic of some functions and not as the generic + * conversion mechanism because, e.g., in the tree walking functions, + * the check for a %NULL value would be redundant. + */ +static struct bfq_entity *bfq_entity_of(struct rb_node *node) +{ + struct bfq_entity *entity = NULL; + + if (node) + entity = rb_entry(node, struct bfq_entity, rb_node); + + return entity; +} + +/** + * bfq_extract - remove an entity from a tree. + * @root: the tree root. + * @entity: the entity to remove. + */ +static void bfq_extract(struct rb_root *root, struct bfq_entity *entity) +{ + BUG_ON(entity->tree != root); + + entity->tree = NULL; + rb_erase(&entity->rb_node, root); +} + +/** + * bfq_idle_extract - extract an entity from the idle tree. + * @st: the service tree of the owning @entity. + * @entity: the entity being removed. + */ +static void bfq_idle_extract(struct bfq_service_tree *st, + struct bfq_entity *entity) +{ + struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); + struct rb_node *next; + + BUG_ON(entity->tree != &st->idle); + + if (entity == st->first_idle) { + next = rb_next(&entity->rb_node); + st->first_idle = bfq_entity_of(next); + } + + if (entity == st->last_idle) { + next = rb_prev(&entity->rb_node); + st->last_idle = bfq_entity_of(next); + } + + bfq_extract(&st->idle, entity); + + if (bfqq) + list_del(&bfqq->bfqq_list); +} + +/** + * bfq_insert - generic tree insertion. + * @root: tree root. + * @entity: entity to insert. + * + * This is used for the idle and the active tree, since they are both + * ordered by finish time. + */ +static void bfq_insert(struct rb_root *root, struct bfq_entity *entity) +{ + struct bfq_entity *entry; + struct rb_node **node = &root->rb_node; + struct rb_node *parent = NULL; + + BUG_ON(entity->tree); + + while (*node) { + parent = *node; + entry = rb_entry(parent, struct bfq_entity, rb_node); + + if (bfq_gt(entry->finish, entity->finish)) + node = &parent->rb_left; + else + node = &parent->rb_right; + } + + rb_link_node(&entity->rb_node, parent, node); + rb_insert_color(&entity->rb_node, root); + + entity->tree = root; +} + +/** + * bfq_update_min - update the min_start field of a entity. + * @entity: the entity to update. + * @node: one of its children. + * + * This function is called when @entity may store an invalid value for + * min_start due to updates to the active tree. The function assumes + * that the subtree rooted at @node (which may be its left or its right + * child) has a valid min_start value. + */ +static void bfq_update_min(struct bfq_entity *entity, struct rb_node *node) +{ + struct bfq_entity *child; + + if (node) { + child = rb_entry(node, struct bfq_entity, rb_node); + if (bfq_gt(entity->min_start, child->min_start)) + entity->min_start = child->min_start; + } +} + +/** + * bfq_update_active_node - recalculate min_start. + * @node: the node to update. + * + * @node may have changed position or one of its children may have moved, + * this function updates its min_start value. The left and right subtrees + * are assumed to hold a correct min_start value. + */ +static void bfq_update_active_node(struct rb_node *node) +{ + struct bfq_entity *entity = rb_entry(node, struct bfq_entity, rb_node); + struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); + + entity->min_start = entity->start; + bfq_update_min(entity, node->rb_right); + bfq_update_min(entity, node->rb_left); + + if (bfqq) { + bfq_log_bfqq(bfqq->bfqd, bfqq, + "update_active_node: new min_start %llu", + ((entity->min_start>>10)*1000)>>12); +#ifdef BFQ_GROUP_IOSCHED_ENABLED + } else { + struct bfq_group *bfqg = + container_of(entity, struct bfq_group, entity); + + bfq_log_bfqg((struct bfq_data *)bfqg->bfqd, bfqg, + "update_active_node: new min_start %llu", + ((entity->min_start>>10)*1000)>>12); +#endif + } +} + +/** + * bfq_update_active_tree - update min_start for the whole active tree. + * @node: the starting node. + * + * @node must be the deepest modified node after an update. This function + * updates its min_start using the values held by its children, assuming + * that they did not change, and then updates all the nodes that may have + * changed in the path to the root. The only nodes that may have changed + * are the ones in the path or their siblings. + */ +static void bfq_update_active_tree(struct rb_node *node) +{ + struct rb_node *parent; + +up: + bfq_update_active_node(node); + + parent = rb_parent(node); + if (!parent) + return; + + if (node == parent->rb_left && parent->rb_right) + bfq_update_active_node(parent->rb_right); + else if (parent->rb_left) + bfq_update_active_node(parent->rb_left); + + node = parent; + goto up; +} + +static void bfq_weights_tree_add(struct bfq_data *bfqd, + struct bfq_entity *entity, + struct rb_root *root); + +static void bfq_weights_tree_remove(struct bfq_data *bfqd, + struct bfq_entity *entity, + struct rb_root *root); + + +/** + * bfq_active_insert - insert an entity in the active tree of its + * group/device. + * @st: the service tree of the entity. + * @entity: the entity being inserted. + * + * The active tree is ordered by finish time, but an extra key is kept + * per each node, containing the minimum value for the start times of + * its children (and the node itself), so it's possible to search for + * the eligible node with the lowest finish time in logarithmic time. + */ +static void bfq_active_insert(struct bfq_service_tree *st, + struct bfq_entity *entity) +{ + struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); + struct rb_node *node = &entity->rb_node; +#ifdef BFQ_GROUP_IOSCHED_ENABLED + struct bfq_sched_data *sd = NULL; + struct bfq_group *bfqg = NULL; + struct bfq_data *bfqd = NULL; +#endif + + bfq_insert(&st->active, entity); + + if (node->rb_left) + node = node->rb_left; + else if (node->rb_right) + node = node->rb_right; + + bfq_update_active_tree(node); + +#ifdef BFQ_GROUP_IOSCHED_ENABLED + sd = entity->sched_data; + bfqg = container_of(sd, struct bfq_group, sched_data); + BUG_ON(!bfqg); + bfqd = (struct bfq_data *)bfqg->bfqd; +#endif + if (bfqq) + list_add(&bfqq->bfqq_list, &bfqq->bfqd->active_list); +#ifdef BFQ_GROUP_IOSCHED_ENABLED + else { /* bfq_group */ + BUG_ON(!bfqd); + bfq_weights_tree_add(bfqd, entity, &bfqd->group_weights_tree); + } + if (bfqg != bfqd->root_group) { + BUG_ON(!bfqg); + BUG_ON(!bfqd); + bfqg->active_entities++; + } +#endif +} + +/** + * bfq_ioprio_to_weight - calc a weight from an ioprio. + * @ioprio: the ioprio value to convert. + */ +static unsigned short bfq_ioprio_to_weight(int ioprio) +{ + BUG_ON(ioprio < 0 || ioprio >= IOPRIO_BE_NR); + return (IOPRIO_BE_NR - ioprio) * BFQ_WEIGHT_CONVERSION_COEFF; +} + +/** + * bfq_weight_to_ioprio - calc an ioprio from a weight. + * @weight: the weight value to convert. + * + * To preserve as much as possible the old only-ioprio user interface, + * 0 is used as an escape ioprio value for weights (numerically) equal or + * larger than IOPRIO_BE_NR * BFQ_WEIGHT_CONVERSION_COEFF. + */ +static unsigned short bfq_weight_to_ioprio(int weight) +{ + BUG_ON(weight < BFQ_MIN_WEIGHT || weight > BFQ_MAX_WEIGHT); + return IOPRIO_BE_NR * BFQ_WEIGHT_CONVERSION_COEFF - weight < 0 ? + 0 : IOPRIO_BE_NR * BFQ_WEIGHT_CONVERSION_COEFF - weight; +} + +static void bfq_get_entity(struct bfq_entity *entity) +{ + struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); + + if (bfqq) { + bfqq->ref++; + bfq_log_bfqq(bfqq->bfqd, bfqq, "get_entity: %p %d", + bfqq, bfqq->ref); + } +} + +/** + * bfq_find_deepest - find the deepest node that an extraction can modify. + * @node: the node being removed. + * + * Do the first step of an extraction in an rb tree, looking for the + * node that will replace @node, and returning the deepest node that + * the following modifications to the tree can touch. If @node is the + * last node in the tree return %NULL. + */ +static struct rb_node *bfq_find_deepest(struct rb_node *node) +{ + struct rb_node *deepest; + + if (!node->rb_right && !node->rb_left) + deepest = rb_parent(node); + else if (!node->rb_right) + deepest = node->rb_left; + else if (!node->rb_left) + deepest = node->rb_right; + else { + deepest = rb_next(node); + if (deepest->rb_right) + deepest = deepest->rb_right; + else if (rb_parent(deepest) != node) + deepest = rb_parent(deepest); + } + + return deepest; +} + +/** + * bfq_active_extract - remove an entity from the active tree. + * @st: the service_tree containing the tree. + * @entity: the entity being removed. + */ +static void bfq_active_extract(struct bfq_service_tree *st, + struct bfq_entity *entity) +{ + struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); + struct rb_node *node; +#ifdef BFQ_GROUP_IOSCHED_ENABLED + struct bfq_sched_data *sd = NULL; + struct bfq_group *bfqg = NULL; + struct bfq_data *bfqd = NULL; +#endif + + node = bfq_find_deepest(&entity->rb_node); + bfq_extract(&st->active, entity); + + if (node) + bfq_update_active_tree(node); + +#ifdef BFQ_GROUP_IOSCHED_ENABLED + sd = entity->sched_data; + bfqg = container_of(sd, struct bfq_group, sched_data); + BUG_ON(!bfqg); + bfqd = (struct bfq_data *)bfqg->bfqd; +#endif + if (bfqq) + list_del(&bfqq->bfqq_list); +#ifdef BFQ_GROUP_IOSCHED_ENABLED + else { /* bfq_group */ + BUG_ON(!bfqd); + bfq_weights_tree_remove(bfqd, entity, + &bfqd->group_weights_tree); + } + if (bfqg != bfqd->root_group) { + BUG_ON(!bfqg); + BUG_ON(!bfqd); + BUG_ON(!bfqg->active_entities); + bfqg->active_entities--; + } +#endif +} + +/** + * bfq_idle_insert - insert an entity into the idle tree. + * @st: the service tree containing the tree. + * @entity: the entity to insert. + */ +static void bfq_idle_insert(struct bfq_service_tree *st, + struct bfq_entity *entity) +{ + struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); + struct bfq_entity *first_idle = st->first_idle; + struct bfq_entity *last_idle = st->last_idle; + + if (!first_idle || bfq_gt(first_idle->finish, entity->finish)) + st->first_idle = entity; + if (!last_idle || bfq_gt(entity->finish, last_idle->finish)) + st->last_idle = entity; + + bfq_insert(&st->idle, entity); + + if (bfqq) + list_add(&bfqq->bfqq_list, &bfqq->bfqd->idle_list); +} + +/** + * bfq_forget_entity - do not consider entity any longer for scheduling + * @st: the service tree. + * @entity: the entity being removed. + * @is_in_service: true if entity is currently the in-service entity. + * + * Forget everything about @entity. In addition, if entity represents + * a queue, and the latter is not in service, then release the service + * reference to the queue (the one taken through bfq_get_entity). In + * fact, in this case, there is really no more service reference to + * the queue, as the latter is also outside any service tree. If, + * instead, the queue is in service, then __bfq_bfqd_reset_in_service + * will take care of putting the reference when the queue finally + * stops being served. + */ +static void bfq_forget_entity(struct bfq_service_tree *st, + struct bfq_entity *entity, + bool is_in_service) +{ + struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); + BUG_ON(!entity->on_st); + + entity->on_st = false; + st->wsum -= entity->weight; + if (bfqq && !is_in_service) { + bfq_log_bfqq(bfqq->bfqd, bfqq, "forget_entity (before): %p %d", + bfqq, bfqq->ref); + bfq_put_queue(bfqq); + } +} + +/** + * bfq_put_idle_entity - release the idle tree ref of an entity. + * @st: service tree for the entity. + * @entity: the entity being released. + */ +static void bfq_put_idle_entity(struct bfq_service_tree *st, + struct bfq_entity *entity) +{ + bfq_idle_extract(st, entity); + bfq_forget_entity(st, entity, + entity == entity->sched_data->in_service_entity); +} + +/** + * bfq_forget_idle - update the idle tree if necessary. + * @st: the service tree to act upon. + * + * To preserve the global O(log N) complexity we only remove one entry here; + * as the idle tree will not grow indefinitely this can be done safely. + */ +static void bfq_forget_idle(struct bfq_service_tree *st) +{ + struct bfq_entity *first_idle = st->first_idle; + struct bfq_entity *last_idle = st->last_idle; + + if (RB_EMPTY_ROOT(&st->active) && last_idle && + !bfq_gt(last_idle->finish, st->vtime)) { + /* + * Forget the whole idle tree, increasing the vtime past + * the last finish time of idle entities. + */ + st->vtime = last_idle->finish; + } + + if (first_idle && !bfq_gt(first_idle->finish, st->vtime)) + bfq_put_idle_entity(st, first_idle); +} + +/* + * Update weight and priority of entity. If update_class_too is true, + * then update the ioprio_class of entity too. + * + * The reason why the update of ioprio_class is controlled through the + * last parameter is as follows. Changing the ioprio class of an + * entity implies changing the destination service trees for that + * entity. If such a change occurred when the entity is already on one + * of the service trees for its previous class, then the state of the + * entity would become more complex: none of the new possible service + * trees for the entity, according to bfq_entity_service_tree(), would + * match any of the possible service trees on which the entity + * is. Complex operations involving these trees, such as entity + * activations and deactivations, should take into account this + * additional complexity. To avoid this issue, this function is + * invoked with update_class_too unset in the points in the code where + * entity may happen to be on some tree. + */ +static struct bfq_service_tree * +__bfq_entity_update_weight_prio(struct bfq_service_tree *old_st, + struct bfq_entity *entity, + bool update_class_too) +{ + struct bfq_service_tree *new_st = old_st; + + if (entity->prio_changed) { + struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); + unsigned int prev_weight, new_weight; + struct bfq_data *bfqd = NULL; + struct rb_root *root; +#ifdef BFQ_GROUP_IOSCHED_ENABLED + struct bfq_sched_data *sd; + struct bfq_group *bfqg; +#endif + + if (bfqq) + bfqd = bfqq->bfqd; +#ifdef BFQ_GROUP_IOSCHED_ENABLED + else { + sd = entity->my_sched_data; + bfqg = container_of(sd, struct bfq_group, sched_data); + BUG_ON(!bfqg); + bfqd = (struct bfq_data *)bfqg->bfqd; + BUG_ON(!bfqd); + } +#endif + + BUG_ON(entity->tree && update_class_too); + BUG_ON(old_st->wsum < entity->weight); + old_st->wsum -= entity->weight; + + if (entity->new_weight != entity->orig_weight) { + if (entity->new_weight < BFQ_MIN_WEIGHT || + entity->new_weight > BFQ_MAX_WEIGHT) { + pr_crit("update_weight_prio: new_weight %d\n", + entity->new_weight); + if (entity->new_weight < BFQ_MIN_WEIGHT) + entity->new_weight = BFQ_MIN_WEIGHT; + else + entity->new_weight = BFQ_MAX_WEIGHT; + } + entity->orig_weight = entity->new_weight; + if (bfqq) + bfqq->ioprio = + bfq_weight_to_ioprio(entity->orig_weight); + } + + if (bfqq && update_class_too) + bfqq->ioprio_class = bfqq->new_ioprio_class; + + /* + * Reset prio_changed only if the ioprio_class change + * is not pending any longer. + */ + if (!bfqq || bfqq->ioprio_class == bfqq->new_ioprio_class) + entity->prio_changed = 0; + + /* + * NOTE: here we may be changing the weight too early, + * this will cause unfairness. The correct approach + * would have required additional complexity to defer + * weight changes to the proper time instants (i.e., + * when entity->finish <= old_st->vtime). + */ + new_st = bfq_entity_service_tree(entity); + + prev_weight = entity->weight; + new_weight = entity->orig_weight * + (bfqq ? bfqq->wr_coeff : 1); + /* + * If the weight of the entity changes, remove the entity + * from its old weight counter (if there is a counter + * associated with the entity), and add it to the counter + * associated with its new weight. + */ + if (prev_weight != new_weight) { + if (bfqq) + bfq_log_bfqq(bfqq->bfqd, bfqq, + "weight changed %d %d(%d %d)", + prev_weight, new_weight, + entity->orig_weight, + bfqq->wr_coeff); + + root = bfqq ? &bfqd->queue_weights_tree : + &bfqd->group_weights_tree; + bfq_weights_tree_remove(bfqd, entity, root); + } + entity->weight = new_weight; + /* + * Add the entity to its weights tree only if it is + * not associated with a weight-raised queue. + */ + if (prev_weight != new_weight && + (bfqq ? bfqq->wr_coeff == 1 : 1)) + /* If we get here, root has been initialized. */ + bfq_weights_tree_add(bfqd, entity, root); + + new_st->wsum += entity->weight; + + if (new_st != old_st) { + BUG_ON(!update_class_too); + entity->start = new_st->vtime; + } + } + + return new_st; +} + +#ifdef BFQ_GROUP_IOSCHED_ENABLED +static void bfqg_stats_set_start_empty_time(struct bfq_group *bfqg); +#endif + +/** + * bfq_bfqq_served - update the scheduler status after selection for + * service. + * @bfqq: the queue being served. + * @served: bytes to transfer. + * + * NOTE: this can be optimized, as the timestamps of upper level entities + * are synchronized every time a new bfqq is selected for service. By now, + * we keep it to better check consistency. + */ +static void bfq_bfqq_served(struct bfq_queue *bfqq, int served) +{ + struct bfq_entity *entity = &bfqq->entity; + struct bfq_service_tree *st; + + for_each_entity(entity) { + st = bfq_entity_service_tree(entity); + + entity->service += served; + + BUG_ON(st->wsum == 0); + + st->vtime += bfq_delta(served, st->wsum); + bfq_forget_idle(st); + } +#ifdef BFQ_GROUP_IOSCHED_ENABLED + bfqg_stats_set_start_empty_time(bfqq_group(bfqq)); +#endif + st = bfq_entity_service_tree(&bfqq->entity); + bfq_log_bfqq(bfqq->bfqd, bfqq, "bfqq_served %d secs, vtime %llu on %p", + served, ((st->vtime>>10)*1000)>>12, st); +} + +/** + * bfq_bfqq_charge_time - charge an amount of service equivalent to the length + * of the time interval during which bfqq has been in + * service. + * @bfqd: the device + * @bfqq: the queue that needs a service update. + * @time_ms: the amount of time during which the queue has received service + * + * If a queue does not consume its budget fast enough, then providing + * the queue with service fairness may impair throughput, more or less + * severely. For this reason, queues that consume their budget slowly + * are provided with time fairness instead of service fairness. This + * goal is achieved through the BFQ scheduling engine, even if such an + * engine works in the service, and not in the time domain. The trick + * is charging these queues with an inflated amount of service, equal + * to the amount of service that they would have received during their + * service slot if they had been fast, i.e., if their requests had + * been dispatched at a rate equal to the estimated peak rate. + * + * It is worth noting that time fairness can cause important + * distortions in terms of bandwidth distribution, on devices with + * internal queueing. The reason is that I/O requests dispatched + * during the service slot of a queue may be served after that service + * slot is finished, and may have a total processing time loosely + * correlated with the duration of the service slot. This is + * especially true for short service slots. + */ +static void bfq_bfqq_charge_time(struct bfq_data *bfqd, struct bfq_queue *bfqq, + unsigned long time_ms) +{ + struct bfq_entity *entity = &bfqq->entity; + int tot_serv_to_charge = entity->service; + unsigned int timeout_ms = jiffies_to_msecs(bfq_timeout); + + if (time_ms > 0 && time_ms < timeout_ms) + tot_serv_to_charge = + (bfqd->bfq_max_budget * time_ms) / timeout_ms; + + if (tot_serv_to_charge < entity->service) + tot_serv_to_charge = entity->service; + + bfq_log_bfqq(bfqq->bfqd, bfqq, + "charge_time: %lu/%u ms, %d/%d/%d sectors", + time_ms, timeout_ms, entity->service, + tot_serv_to_charge, entity->budget); + + /* Increase budget to avoid inconsistencies */ + if (tot_serv_to_charge > entity->budget) + entity->budget = tot_serv_to_charge; + + bfq_bfqq_served(bfqq, + max_t(int, 0, tot_serv_to_charge - entity->service)); +} + +static void bfq_update_fin_time_enqueue(struct bfq_entity *entity, + struct bfq_service_tree *st, + bool backshifted) +{ + struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); + struct bfq_sched_data *sd = entity->sched_data; + + /* + * When this function is invoked, entity is not in any service + * tree, then it is safe to invoke next function with the last + * parameter set (see the comments on the function). + */ + BUG_ON(entity->tree); + st = __bfq_entity_update_weight_prio(st, entity, true); + bfq_calc_finish(entity, entity->budget); + + /* + * If some queues enjoy backshifting for a while, then their + * (virtual) finish timestamps may happen to become lower and + * lower than the system virtual time. In particular, if + * these queues often happen to be idle for short time + * periods, and during such time periods other queues with + * higher timestamps happen to be busy, then the backshifted + * timestamps of the former queues can become much lower than + * the system virtual time. In fact, to serve the queues with + * higher timestamps while the ones with lower timestamps are + * idle, the system virtual time may be pushed-up to much + * higher values than the finish timestamps of the idle + * queues. As a consequence, the finish timestamps of all new + * or newly activated queues may end up being much larger than + * those of lucky queues with backshifted timestamps. The + * latter queues may then monopolize the device for a lot of + * time. This would simply break service guarantees. + * + * To reduce this problem, push up a little bit the + * backshifted timestamps of the queue associated with this + * entity (only a queue can happen to have the backshifted + * flag set): just enough to let the finish timestamp of the + * queue be equal to the current value of the system virtual + * time. This may introduce a little unfairness among queues + * with backshifted timestamps, but it does not break + * worst-case fairness guarantees. + * + * As a special case, if bfqq is weight-raised, push up + * timestamps much less, to keep very low the probability that + * this push up causes the backshifted finish timestamps of + * weight-raised queues to become higher than the backshifted + * finish timestamps of non weight-raised queues. + */ + if (backshifted && bfq_gt(st->vtime, entity->finish)) { + unsigned long delta = st->vtime - entity->finish; + + if (bfqq) + delta /= bfqq->wr_coeff; + + entity->start += delta; + entity->finish += delta; + + if (bfqq) { + bfq_log_bfqq(bfqq->bfqd, bfqq, + "update_fin_time_enqueue: new queue finish %llu", + ((entity->finish>>10)*1000)>>12); +#ifdef BFQ_GROUP_IOSCHED_ENABLED + } else { + struct bfq_group *bfqg = + container_of(entity, struct bfq_group, entity); + + bfq_log_bfqg((struct bfq_data *)bfqg->bfqd, bfqg, + "update_fin_time_enqueue: new group finish %llu", + ((entity->finish>>10)*1000)>>12); +#endif + } + } + + bfq_active_insert(st, entity); + + if (bfqq) { + bfq_log_bfqq(bfqq->bfqd, bfqq, + "update_fin_time_enqueue: queue %seligible in st %p", + entity->start <= st->vtime ? "" : "non ", st); +#ifdef BFQ_GROUP_IOSCHED_ENABLED + } else { + struct bfq_group *bfqg = + container_of(entity, struct bfq_group, entity); + + bfq_log_bfqg((struct bfq_data *)bfqg->bfqd, bfqg, + "update_fin_time_enqueue: group %seligible in st %p", + entity->start <= st->vtime ? "" : "non ", st); +#endif + } + BUG_ON(RB_EMPTY_ROOT(&st->active)); + BUG_ON(&st->active != &sd->service_tree->active && + &st->active != &(sd->service_tree+1)->active && + &st->active != &(sd->service_tree+2)->active); +} + +/** + * __bfq_activate_entity - handle activation of entity. + * @entity: the entity being activated. + * @non_blocking_wait_rq: true if entity was waiting for a request + * + * Called for a 'true' activation, i.e., if entity is not active and + * one of its children receives a new request. + * + * Basically, this function updates the timestamps of entity and + * inserts entity into its active tree, ater possibly extracting it + * from its idle tree. + */ +static void __bfq_activate_entity(struct bfq_entity *entity, + bool non_blocking_wait_rq) +{ + struct bfq_sched_data *sd = entity->sched_data; + struct bfq_service_tree *st = bfq_entity_service_tree(entity); + struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); + bool backshifted = false; + unsigned long long min_vstart; + + BUG_ON(!sd); + BUG_ON(!st); + + /* See comments on bfq_fqq_update_budg_for_activation */ + if (non_blocking_wait_rq && bfq_gt(st->vtime, entity->finish)) { + backshifted = true; + min_vstart = entity->finish; + } else + min_vstart = st->vtime; + + if (entity->tree == &st->idle) { + /* + * Must be on the idle tree, bfq_idle_extract() will + * check for that. + */ + bfq_idle_extract(st, entity); + BUG_ON(entity->tree); + entity->start = bfq_gt(min_vstart, entity->finish) ? + min_vstart : entity->finish; + } else { + BUG_ON(entity->tree); + /* + * The finish time of the entity may be invalid, and + * it is in the past for sure, otherwise the queue + * would have been on the idle tree. + */ + entity->start = min_vstart; + st->wsum += entity->weight; + /* + * entity is about to be inserted into a service tree, + * and then set in service: get a reference to make + * sure entity does not disappear until it is no + * longer in service or scheduled for service. + */ + bfq_get_entity(entity); + + BUG_ON(entity->on_st && bfqq); + +#ifdef BFQ_GROUP_IOSCHED_ENABLED + if (entity->on_st && !bfqq) { + struct bfq_group *bfqg = + container_of(entity, struct bfq_group, + entity); + + bfq_log_bfqg((struct bfq_data *)bfqg->bfqd, + bfqg, + "activate bug, class %d in_service %p", + bfq_class_idx(entity), sd->in_service_entity); + } +#endif + BUG_ON(entity->on_st && !bfqq); + entity->on_st = true; + } + + bfq_update_fin_time_enqueue(entity, st, backshifted); +} + +/** + * __bfq_requeue_entity - handle requeueing or repositioning of an entity. + * @entity: the entity being requeued or repositioned. + * + * Requeueing is needed if this entity stops being served, which + * happens if a leaf descendant entity has expired. On the other hand, + * repositioning is needed if the next_inservice_entity for the child + * entity has changed. See the comments inside the function for + * details. + * + * Basically, this function: 1) removes entity from its active tree if + * present there, 2) updates the timestamps of entity and 3) inserts + * entity back into its active tree (in the new, right position for + * the new values of the timestamps). + */ +static void __bfq_requeue_entity(struct bfq_entity *entity) +{ + struct bfq_sched_data *sd = entity->sched_data; + struct bfq_service_tree *st = bfq_entity_service_tree(entity); + + BUG_ON(!sd); + BUG_ON(!st); + + BUG_ON(entity != sd->in_service_entity && + entity->tree != &st->active); + + if (entity == sd->in_service_entity) { + /* + * We are requeueing the current in-service entity, + * which may have to be done for one of the following + * reasons: + * - entity represents the in-service queue, and the + * in-service queue is being requeued after an + * expiration; + * - entity represents a group, and its budget has + * changed because one of its child entities has + * just been either activated or requeued for some + * reason; the timestamps of the entity need then to + * be updated, and the entity needs to be enqueued + * or repositioned accordingly. + * + * In particular, before requeueing, the start time of + * the entity must be moved forward to account for the + * service that the entity has received while in + * service. This is done by the next instructions. The + * finish time will then be updated according to this + * new value of the start time, and to the budget of + * the entity. + */ + bfq_calc_finish(entity, entity->service); + entity->start = entity->finish; + BUG_ON(entity->tree && entity->tree == &st->idle); + BUG_ON(entity->tree && entity->tree != &st->active); + /* + * In addition, if the entity had more than one child + * when set in service, then it was not extracted from + * the active tree. This implies that the position of + * the entity in the active tree may need to be + * changed now, because we have just updated the start + * time of the entity, and we will update its finish + * time in a moment (the requeueing is then, more + * precisely, a repositioning in this case). To + * implement this repositioning, we: 1) dequeue the + * entity here, 2) update the finish time and requeue + * the entity according to the new timestamps below. + */ + if (entity->tree) + bfq_active_extract(st, entity); + } else { /* The entity is already active, and not in service */ + /* + * In this case, this function gets called only if the + * next_in_service entity below this entity has + * changed, and this change has caused the budget of + * this entity to change, which, finally implies that + * the finish time of this entity must be + * updated. Such an update may cause the scheduling, + * i.e., the position in the active tree, of this + * entity to change. We handle this change by: 1) + * dequeueing the entity here, 2) updating the finish + * time and requeueing the entity according to the new + * timestamps below. This is the same approach as the + * non-extracted-entity sub-case above. + */ + bfq_active_extract(st, entity); + } + + bfq_update_fin_time_enqueue(entity, st, false); +} + +static void __bfq_activate_requeue_entity(struct bfq_entity *entity, + struct bfq_sched_data *sd, + bool non_blocking_wait_rq) +{ + struct bfq_service_tree *st = bfq_entity_service_tree(entity); + + if (sd->in_service_entity == entity || entity->tree == &st->active) + /* + * in service or already queued on the active tree, + * requeue or reposition + */ + __bfq_requeue_entity(entity); + else + /* + * Not in service and not queued on its active tree: + * the activity is idle and this is a true activation. + */ + __bfq_activate_entity(entity, non_blocking_wait_rq); +} + + +/** + * bfq_activate_requeue_entity - activate or requeue an entity representing a bfq_queue, + * and activate, requeue or reposition all ancestors + * for which such an update becomes necessary. + * @entity: the entity to activate. + * @non_blocking_wait_rq: true if this entity was waiting for a request + * @requeue: true if this is a requeue, which implies that bfqq is + * being expired; thus ALL its ancestors stop being served and must + * therefore be requeued + * @expiration: true if this function is being invoked in the expiration path + * of the in-service queue + */ +static void bfq_activate_requeue_entity(struct bfq_entity *entity, + bool non_blocking_wait_rq, + bool requeue, bool expiration) +{ + struct bfq_sched_data *sd; + + for_each_entity(entity) { + BUG_ON(!entity); + sd = entity->sched_data; + __bfq_activate_requeue_entity(entity, sd, non_blocking_wait_rq); + + BUG_ON(RB_EMPTY_ROOT(&sd->service_tree->active) && + RB_EMPTY_ROOT(&(sd->service_tree+1)->active) && + RB_EMPTY_ROOT(&(sd->service_tree+2)->active)); + + if (!bfq_update_next_in_service(sd, entity, expiration) && + !requeue) { + BUG_ON(!sd->next_in_service); + break; + } + BUG_ON(!sd->next_in_service); + } +} + +/** + * __bfq_deactivate_entity - deactivate an entity from its service tree. + * @entity: the entity to deactivate. + * @ins_into_idle_tree: if false, the entity will not be put into the + * idle tree. + * + * Deactivates an entity, independently of its previous state. Must + * be invoked only if entity is on a service tree. Extracts the entity + * from that tree, and if necessary and allowed, puts it into the idle + * tree. + */ +static bool __bfq_deactivate_entity(struct bfq_entity *entity, + bool ins_into_idle_tree) +{ + struct bfq_sched_data *sd = entity->sched_data; + struct bfq_service_tree *st; + bool is_in_service; + + if (!entity->on_st) { /* entity never activated, or already inactive */ + BUG_ON(sd && entity == sd->in_service_entity); + return false; + } + + /* + * If we get here, then entity is active, which implies that + * bfq_group_set_parent has already been invoked for the group + * represented by entity. Therefore, the field + * entity->sched_data has been set, and we can safely use it. + */ + st = bfq_entity_service_tree(entity); + is_in_service = entity == sd->in_service_entity; + + BUG_ON(is_in_service && entity->tree && entity->tree != &st->active); + + if (is_in_service) { + bfq_calc_finish(entity, entity->service); + sd->in_service_entity = NULL; + } + + if (entity->tree == &st->active) + bfq_active_extract(st, entity); + else if (!is_in_service && entity->tree == &st->idle) + bfq_idle_extract(st, entity); + else if (entity->tree) + BUG(); + + if (!ins_into_idle_tree || !bfq_gt(entity->finish, st->vtime)) + bfq_forget_entity(st, entity, is_in_service); + else + bfq_idle_insert(st, entity); + + return true; +} + +/** + * bfq_deactivate_entity - deactivate an entity representing a bfq_queue. + * @entity: the entity to deactivate. + * @ins_into_idle_tree: true if the entity can be put into the idle tree + * @expiration: true if this function is being invoked in the expiration path + * of the in-service queue + */ +static void bfq_deactivate_entity(struct bfq_entity *entity, + bool ins_into_idle_tree, + bool expiration) +{ + struct bfq_sched_data *sd; + struct bfq_entity *parent = NULL; + + for_each_entity_safe(entity, parent) { + sd = entity->sched_data; + + BUG_ON(sd == NULL); /* + * It would mean that this is the + * root group. + */ + + BUG_ON(expiration && entity != sd->in_service_entity); + + BUG_ON(entity != sd->in_service_entity && + entity->tree == + &bfq_entity_service_tree(entity)->active && + !sd->next_in_service); + + if (!__bfq_deactivate_entity(entity, ins_into_idle_tree)) { + /* + * entity is not in any tree any more, so + * this deactivation is a no-op, and there is + * nothing to change for upper-level entities + * (in case of expiration, this can never + * happen). + */ + BUG_ON(expiration); /* + * entity cannot be already out of + * any tree + */ + return; + } + + if (sd->next_in_service == entity) + /* + * entity was the next_in_service entity, + * then, since entity has just been + * deactivated, a new one must be found. + */ + bfq_update_next_in_service(sd, NULL, expiration); + + if (sd->next_in_service || sd->in_service_entity) { + /* + * The parent entity is still active, because + * either next_in_service or in_service_entity + * is not NULL. So, no further upwards + * deactivation must be performed. Yet, + * next_in_service has changed. Then the + * schedule does need to be updated upwards. + * + * NOTE If in_service_entity is not NULL, then + * next_in_service may happen to be NULL, + * although the parent entity is evidently + * active. This happens if 1) the entity + * pointed by in_service_entity is the only + * active entity in the parent entity, and 2) + * according to the definition of + * next_in_service, the in_service_entity + * cannot be considered as + * next_in_service. See the comments on the + * definition of next_in_service for details. + */ + BUG_ON(sd->next_in_service == entity); + BUG_ON(sd->in_service_entity == entity); + break; + } + + /* + * If we get here, then the parent is no more + * backlogged and we need to propagate the + * deactivation upwards. Thus let the loop go on. + */ + + /* + * Also let parent be queued into the idle tree on + * deactivation, to preserve service guarantees, and + * assuming that who invoked this function does not + * need parent entities too to be removed completely. + */ + ins_into_idle_tree = true; + } + + /* + * If the deactivation loop is fully executed, then there are + * no more entities to touch and next loop is not executed at + * all. Otherwise, requeue remaining entities if they are + * about to stop receiving service, or reposition them if this + * is not the case. + */ + entity = parent; + for_each_entity(entity) { + struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); + + /* + * Invoke __bfq_requeue_entity on entity, even if + * already active, to requeue/reposition it in the + * active tree (because sd->next_in_service has + * changed) + */ + __bfq_requeue_entity(entity); + + sd = entity->sched_data; + BUG_ON(expiration && sd->in_service_entity != entity); + + if (bfqq) + bfq_log_bfqq(bfqq->bfqd, bfqq, + "invoking udpdate_next for this queue"); +#ifdef BFQ_GROUP_IOSCHED_ENABLED + else { + struct bfq_group *bfqg = + container_of(entity, + struct bfq_group, entity); + + bfq_log_bfqg((struct bfq_data *)bfqg->bfqd, bfqg, + "invoking udpdate_next for this entity"); + } +#endif + if (!bfq_update_next_in_service(sd, entity, expiration) && + !expiration) + /* + * next_in_service unchanged or not causing + * any change in entity->parent->sd, and no + * requeueing needed for expiration: stop + * here. + */ + break; + } +} + +/** + * bfq_calc_vtime_jump - compute the value to which the vtime should jump, + * if needed, to have at least one entity eligible. + * @st: the service tree to act upon. + * + * Assumes that st is not empty. + */ +static u64 bfq_calc_vtime_jump(struct bfq_service_tree *st) +{ + struct bfq_entity *root_entity = bfq_root_active_entity(&st->active); + + if (bfq_gt(root_entity->min_start, st->vtime)) { + struct bfq_queue *bfqq = bfq_entity_to_bfqq(root_entity); + + if (bfqq) + bfq_log_bfqq(bfqq->bfqd, bfqq, + "calc_vtime_jump: new value %llu", + ((root_entity->min_start>>10)*1000)>>12); +#ifdef BFQ_GROUP_IOSCHED_ENABLED + else { + struct bfq_group *bfqg = + container_of(root_entity, struct bfq_group, + entity); + + bfq_log_bfqg((struct bfq_data *)bfqg->bfqd, bfqg, + "calc_vtime_jump: new value %llu", + ((root_entity->min_start>>10)*1000)>>12); + } +#endif + return root_entity->min_start; + } + return st->vtime; +} + +static void bfq_update_vtime(struct bfq_service_tree *st, u64 new_value) +{ + if (new_value > st->vtime) { + st->vtime = new_value; + bfq_forget_idle(st); + } +} + +/** + * bfq_first_active_entity - find the eligible entity with + * the smallest finish time + * @st: the service tree to select from. + * @vtime: the system virtual to use as a reference for eligibility + * + * This function searches the first schedulable entity, starting from the + * root of the tree and going on the left every time on this side there is + * a subtree with at least one eligible (start >= vtime) entity. The path on + * the right is followed only if a) the left subtree contains no eligible + * entities and b) no eligible entity has been found yet. + */ +static struct bfq_entity *bfq_first_active_entity(struct bfq_service_tree *st, + u64 vtime) +{ + struct bfq_entity *entry, *first = NULL; + struct rb_node *node = st->active.rb_node; + + while (node) { + entry = rb_entry(node, struct bfq_entity, rb_node); +left: + if (!bfq_gt(entry->start, vtime)) + first = entry; + + BUG_ON(bfq_gt(entry->min_start, vtime)); + + if (node->rb_left) { + entry = rb_entry(node->rb_left, + struct bfq_entity, rb_node); + if (!bfq_gt(entry->min_start, vtime)) { + node = node->rb_left; + goto left; + } + } + if (first) + break; + node = node->rb_right; + } + + BUG_ON(!first && !RB_EMPTY_ROOT(&st->active)); + return first; +} + +/** + * __bfq_lookup_next_entity - return the first eligible entity in @st. + * @st: the service tree. + * + * If there is no in-service entity for the sched_data st belongs to, + * then return the entity that will be set in service if: + * 1) the parent entity this st belongs to is set in service; + * 2) no entity belonging to such parent entity undergoes a state change + * that would influence the timestamps of the entity (e.g., becomes idle, + * becomes backlogged, changes its budget, ...). + * + * In this first case, update the virtual time in @st too (see the + * comments on this update inside the function). + * + * In constrast, if there is an in-service entity, then return the + * entity that would be set in service if not only the above + * conditions, but also the next one held true: the currently + * in-service entity, on expiration, + * 1) gets a finish time equal to the current one, or + * 2) is not eligible any more, or + * 3) is idle. + */ +static struct bfq_entity * +__bfq_lookup_next_entity(struct bfq_service_tree *st, bool in_service) +{ + struct bfq_entity *entity; + u64 new_vtime; + struct bfq_queue *bfqq; + + if (RB_EMPTY_ROOT(&st->active)) + return NULL; + + /* + * Get the value of the system virtual time for which at + * least one entity is eligible. + */ + new_vtime = bfq_calc_vtime_jump(st); + + /* + * If there is no in-service entity for the sched_data this + * active tree belongs to, then push the system virtual time + * up to the value that guarantees that at least one entity is + * eligible. If, instead, there is an in-service entity, then + * do not make any such update, because there is already an + * eligible entity, namely the in-service one (even if the + * entity is not on st, because it was extracted when set in + * service). + */ + if (!in_service) + bfq_update_vtime(st, new_vtime); + + entity = bfq_first_active_entity(st, new_vtime); + BUG_ON(bfq_gt(entity->start, new_vtime)); + + /* Log some information */ + bfqq = bfq_entity_to_bfqq(entity); + if (bfqq) + bfq_log_bfqq(bfqq->bfqd, bfqq, + "__lookup_next: start %llu vtime %llu st %p", + ((entity->start>>10)*1000)>>12, + ((new_vtime>>10)*1000)>>12, st); +#ifdef BFQ_GROUP_IOSCHED_ENABLED + else { + struct bfq_group *bfqg = + container_of(entity, struct bfq_group, entity); + + bfq_log_bfqg((struct bfq_data *)bfqg->bfqd, bfqg, + "__lookup_next: start %llu vtime %llu (%llu) st %p", + ((entity->start>>10)*1000)>>12, + ((st->vtime>>10)*1000)>>12, + ((new_vtime>>10)*1000)>>12, st); + } +#endif + + BUG_ON(!entity); + + return entity; +} + +/** + * bfq_lookup_next_entity - return the first eligible entity in @sd. + * @sd: the sched_data. + * @expiration: true if we are on the expiration path of the in-service queue + * + * This function is invoked when there has been a change in the trees + * for sd, and we need to know what is the new next entity to serve + * after this change. + */ +static struct bfq_entity *bfq_lookup_next_entity(struct bfq_sched_data *sd, + bool expiration) +{ + struct bfq_service_tree *st = sd->service_tree; + struct bfq_service_tree *idle_class_st = st + (BFQ_IOPRIO_CLASSES - 1); + struct bfq_entity *entity = NULL; + struct bfq_queue *bfqq; + int class_idx = 0; + + BUG_ON(!sd); + BUG_ON(!st); + /* + * Choose from idle class, if needed to guarantee a minimum + * bandwidth to this class (and if there is some active entity + * in idle class). This should also mitigate + * priority-inversion problems in case a low priority task is + * holding file system resources. + */ + if (time_is_before_jiffies(sd->bfq_class_idle_last_service + + BFQ_CL_IDLE_TIMEOUT)) { + if (!RB_EMPTY_ROOT(&idle_class_st->active)) + class_idx = BFQ_IOPRIO_CLASSES - 1; + /* About to be served if backlogged, or not yet backlogged */ + sd->bfq_class_idle_last_service = jiffies; + } + + /* + * Find the next entity to serve for the highest-priority + * class, unless the idle class needs to be served. + */ + for (; class_idx < BFQ_IOPRIO_CLASSES; class_idx++) { + /* + * If expiration is true, then bfq_lookup_next_entity + * is being invoked as a part of the expiration path + * of the in-service queue. In this case, even if + * sd->in_service_entity is not NULL, + * sd->in_service_entiy at this point is actually not + * in service any more, and, if needed, has already + * been properly queued or requeued into the right + * tree. The reason why sd->in_service_entity is still + * not NULL here, even if expiration is true, is that + * sd->in_service_entiy is reset as a last step in the + * expiration path. So, if expiration is true, tell + * __bfq_lookup_next_entity that there is no + * sd->in_service_entity. + */ + entity = __bfq_lookup_next_entity(st + class_idx, + sd->in_service_entity && + !expiration); + + if (entity) + break; + } + + BUG_ON(!entity && + (!RB_EMPTY_ROOT(&st->active) || !RB_EMPTY_ROOT(&(st+1)->active) || + !RB_EMPTY_ROOT(&(st+2)->active))); + + if (!entity) + return NULL; + + /* Log some information */ + bfqq = bfq_entity_to_bfqq(entity); + if (bfqq) + bfq_log_bfqq(bfqq->bfqd, bfqq, "chosen from st %p %d", + st + class_idx, class_idx); +#ifdef BFQ_GROUP_IOSCHED_ENABLED + else { + struct bfq_group *bfqg = + container_of(entity, struct bfq_group, entity); + + bfq_log_bfqg((struct bfq_data *)bfqg->bfqd, bfqg, + "chosen from st %p %d", + st + class_idx, class_idx); + } +#endif + + return entity; +} + +static bool next_queue_may_preempt(struct bfq_data *bfqd) +{ + struct bfq_sched_data *sd = &bfqd->root_group->sched_data; + + return sd->next_in_service != sd->in_service_entity; +} + +/* + * Get next queue for service. + */ +static struct bfq_queue *bfq_get_next_queue(struct bfq_data *bfqd) +{ + struct bfq_entity *entity = NULL; + struct bfq_sched_data *sd; + struct bfq_queue *bfqq; + + BUG_ON(bfqd->in_service_queue); + + if (bfqd->busy_queues == 0) + return NULL; + + /* + * Traverse the path from the root to the leaf entity to + * serve. Set in service all the entities visited along the + * way. + */ + sd = &bfqd->root_group->sched_data; + for (; sd ; sd = entity->my_sched_data) { +#ifdef BFQ_GROUP_IOSCHED_ENABLED + if (entity) { + struct bfq_group *bfqg = + container_of(entity, struct bfq_group, entity); + + bfq_log_bfqg(bfqd, bfqg, + "get_next_queue: lookup in this group"); + if (!sd->next_in_service) + pr_crit("get_next_queue: lookup in this group"); + } else { + bfq_log_bfqg(bfqd, bfqd->root_group, + "get_next_queue: lookup in root group"); + if (!sd->next_in_service) + pr_crit("get_next_queue: lookup in root group"); + } +#endif + + BUG_ON(!sd->next_in_service); + + /* + * WARNING. We are about to set the in-service entity + * to sd->next_in_service, i.e., to the (cached) value + * returned by bfq_lookup_next_entity(sd) the last + * time it was invoked, i.e., the last time when the + * service order in sd changed as a consequence of the + * activation or deactivation of an entity. In this + * respect, if we execute bfq_lookup_next_entity(sd) + * in this very moment, it may, although with low + * probability, yield a different entity than that + * pointed to by sd->next_in_service. This rare event + * happens in case there was no CLASS_IDLE entity to + * serve for sd when bfq_lookup_next_entity(sd) was + * invoked for the last time, while there is now one + * such entity. + * + * If the above event happens, then the scheduling of + * such entity in CLASS_IDLE is postponed until the + * service of the sd->next_in_service entity + * finishes. In fact, when the latter is expired, + * bfq_lookup_next_entity(sd) gets called again, + * exactly to update sd->next_in_service. + */ + + /* Make next_in_service entity become in_service_entity */ + entity = sd->next_in_service; + sd->in_service_entity = entity; + + /* + * Reset the accumulator of the amount of service that + * the entity is about to receive. + */ + entity->service = 0; + + /* + * If entity is no longer a candidate for next + * service, then it must be extracted from its active + * tree, so as to make sure that it won't be + * considered when computing next_in_service. See the + * comments on the function + * bfq_no_longer_next_in_service() for details. + */ + if (bfq_no_longer_next_in_service(entity)) + bfq_active_extract(bfq_entity_service_tree(entity), + entity); + + /* + * Even if entity is not to be extracted according to + * the above check, a descendant entity may get + * extracted in one of the next iterations of this + * loop. Such an event could cause a change in + * next_in_service for the level of the descendant + * entity, and thus possibly back to this level. + * + * However, we cannot perform the resulting needed + * update of next_in_service for this level before the + * end of the whole loop, because, to know which is + * the correct next-to-serve candidate entity for each + * level, we need first to find the leaf entity to set + * in service. In fact, only after we know which is + * the next-to-serve leaf entity, we can discover + * whether the parent entity of the leaf entity + * becomes the next-to-serve, and so on. + */ + + /* Log some information */ + bfqq = bfq_entity_to_bfqq(entity); + if (bfqq) + bfq_log_bfqq(bfqd, bfqq, + "get_next_queue: this queue, finish %llu", + (((entity->finish>>10)*1000)>>10)>>2); +#ifdef BFQ_GROUP_IOSCHED_ENABLED + else { + struct bfq_group *bfqg = + container_of(entity, struct bfq_group, entity); + + bfq_log_bfqg(bfqd, bfqg, + "get_next_queue: this entity, finish %llu", + (((entity->finish>>10)*1000)>>10)>>2); + } +#endif + + } + + BUG_ON(!entity); + bfqq = bfq_entity_to_bfqq(entity); + BUG_ON(!bfqq); + + /* + * We can finally update all next-to-serve entities along the + * path from the leaf entity just set in service to the root. + */ + for_each_entity(entity) { + struct bfq_sched_data *sd = entity->sched_data; + + if (!bfq_update_next_in_service(sd, NULL, false)) + break; + } + + return bfqq; +} + +static void __bfq_bfqd_reset_in_service(struct bfq_data *bfqd) +{ + struct bfq_queue *in_serv_bfqq = bfqd->in_service_queue; + struct bfq_entity *in_serv_entity = &in_serv_bfqq->entity; + struct bfq_entity *entity = in_serv_entity; + +#ifndef BFQ_MQ + if (bfqd->in_service_bic) { + put_io_context(bfqd->in_service_bic->icq.ioc); + bfqd->in_service_bic = NULL; + } +#endif + + bfq_clear_bfqq_wait_request(in_serv_bfqq); + hrtimer_try_to_cancel(&bfqd->idle_slice_timer); + bfqd->in_service_queue = NULL; + + /* + * When this function is called, all in-service entities have + * been properly deactivated or requeued, so we can safely + * execute the final step: reset in_service_entity along the + * path from entity to the root. + */ + for_each_entity(entity) + entity->sched_data->in_service_entity = NULL; + + /* + * in_serv_entity is no longer in service, so, if it is in no + * service tree either, then release the service reference to + * the queue it represents (taken with bfq_get_entity). + */ + if (!in_serv_entity->on_st) + bfq_put_queue(in_serv_bfqq); +} + +static void bfq_deactivate_bfqq(struct bfq_data *bfqd, struct bfq_queue *bfqq, + bool ins_into_idle_tree, bool expiration) +{ + struct bfq_entity *entity = &bfqq->entity; + + bfq_deactivate_entity(entity, ins_into_idle_tree, expiration); +} + +static void bfq_activate_bfqq(struct bfq_data *bfqd, struct bfq_queue *bfqq) +{ + struct bfq_entity *entity = &bfqq->entity; + struct bfq_service_tree *st = bfq_entity_service_tree(entity); + + BUG_ON(bfqq == bfqd->in_service_queue); + BUG_ON(entity->tree != &st->active && entity->tree != &st->idle && + entity->on_st); + + bfq_activate_requeue_entity(entity, bfq_bfqq_non_blocking_wait_rq(bfqq), + false, false); + bfq_clear_bfqq_non_blocking_wait_rq(bfqq); +} + +static void bfq_requeue_bfqq(struct bfq_data *bfqd, struct bfq_queue *bfqq, + bool expiration) +{ + struct bfq_entity *entity = &bfqq->entity; + + bfq_activate_requeue_entity(entity, false, + bfqq == bfqd->in_service_queue, expiration); +} + +static void bfqg_stats_update_dequeue(struct bfq_group *bfqg); + +/* + * Called when the bfqq no longer has requests pending, remove it from + * the service tree. As a special case, it can be invoked during an + * expiration. + */ +static void bfq_del_bfqq_busy(struct bfq_data *bfqd, struct bfq_queue *bfqq, + bool expiration) +{ + BUG_ON(!bfq_bfqq_busy(bfqq)); + BUG_ON(!RB_EMPTY_ROOT(&bfqq->sort_list)); + + bfq_log_bfqq(bfqd, bfqq, "del from busy"); + + bfq_clear_bfqq_busy(bfqq); + + BUG_ON(bfqd->busy_queues == 0); + bfqd->busy_queues--; + + if (!bfqq->dispatched) + bfq_weights_tree_remove(bfqd, &bfqq->entity, + &bfqd->queue_weights_tree); + + if (bfqq->wr_coeff > 1) { + bfqd->wr_busy_queues--; + BUG_ON(bfqd->wr_busy_queues < 0); + } + + bfqg_stats_update_dequeue(bfqq_group(bfqq)); + + BUG_ON(bfqq->entity.budget < 0); + + bfq_deactivate_bfqq(bfqd, bfqq, true, expiration); +} + +/* + * Called when an inactive queue receives a new request. + */ +static void bfq_add_bfqq_busy(struct bfq_data *bfqd, struct bfq_queue *bfqq) +{ + BUG_ON(bfq_bfqq_busy(bfqq)); + BUG_ON(bfqq == bfqd->in_service_queue); + + bfq_log_bfqq(bfqd, bfqq, "add to busy"); + + bfq_activate_bfqq(bfqd, bfqq); + + bfq_mark_bfqq_busy(bfqq); + bfqd->busy_queues++; + + if (!bfqq->dispatched) + if (bfqq->wr_coeff == 1) + bfq_weights_tree_add(bfqd, &bfqq->entity, + &bfqd->queue_weights_tree); + + if (bfqq->wr_coeff > 1) { + bfqd->wr_busy_queues++; + BUG_ON(bfqd->wr_busy_queues > bfqd->busy_queues); + } + +} diff --git a/block/bfq-sq-iosched.c b/block/bfq-sq-iosched.c new file mode 100644 index 0000000000000000..5b456e48e0cc0e96 --- /dev/null +++ b/block/bfq-sq-iosched.c @@ -0,0 +1,5405 @@ +/* + * Budget Fair Queueing (BFQ) I/O scheduler. + * + * Based on ideas and code from CFQ: + * Copyright (C) 2003 Jens Axboe + * + * Copyright (C) 2008 Fabio Checconi + * Paolo Valente + * + * Copyright (C) 2015 Paolo Valente + * + * Copyright (C) 2017 Paolo Valente + * + * Licensed under the GPL-2 as detailed in the accompanying COPYING.BFQ + * file. + * + * BFQ is a proportional-share I/O scheduler, with some extra + * low-latency capabilities. BFQ also supports full hierarchical + * scheduling through cgroups. Next paragraphs provide an introduction + * on BFQ inner workings. Details on BFQ benefits and usage can be + * found in Documentation/block/bfq-iosched.txt. + * + * BFQ is a proportional-share storage-I/O scheduling algorithm based + * on the slice-by-slice service scheme of CFQ. But BFQ assigns + * budgets, measured in number of sectors, to processes instead of + * time slices. The device is not granted to the in-service process + * for a given time slice, but until it has exhausted its assigned + * budget. This change from the time to the service domain enables BFQ + * to distribute the device throughput among processes as desired, + * without any distortion due to throughput fluctuations, or to device + * internal queueing. BFQ uses an ad hoc internal scheduler, called + * B-WF2Q+, to schedule processes according to their budgets. More + * precisely, BFQ schedules queues associated with processes. Thanks to + * the accurate policy of B-WF2Q+, BFQ can afford to assign high + * budgets to I/O-bound processes issuing sequential requests (to + * boost the throughput), and yet guarantee a low latency to + * interactive and soft real-time applications. + * + * NOTE: if the main or only goal, with a given device, is to achieve + * the maximum-possible throughput at all times, then do switch off + * all low-latency heuristics for that device, by setting low_latency + * to 0. + * + * BFQ is described in [1], where also a reference to the initial, more + * theoretical paper on BFQ can be found. The interested reader can find + * in the latter paper full details on the main algorithm, as well as + * formulas of the guarantees and formal proofs of all the properties. + * With respect to the version of BFQ presented in these papers, this + * implementation adds a few more heuristics, such as the one that + * guarantees a low latency to soft real-time applications, and a + * hierarchical extension based on H-WF2Q+. + * + * B-WF2Q+ is based on WF2Q+, that is described in [2], together with + * H-WF2Q+, while the augmented tree used to implement B-WF2Q+ with O(log N) + * complexity derives from the one introduced with EEVDF in [3]. + * + * [1] P. Valente, A. Avanzini, "Evolution of the BFQ Storage I/O + * Scheduler", Proceedings of the First Workshop on Mobile System + * Technologies (MST-2015), May 2015. + * http://algogroup.unimore.it/people/paolo/disk_sched/mst-2015.pdf + * + * http://algogroup.unimo.it/people/paolo/disk_sched/bf1-v1-suite-results.pdf + * + * [2] Jon C.R. Bennett and H. Zhang, ``Hierarchical Packet Fair Queueing + * Algorithms,'' IEEE/ACM Transactions on Networking, 5(5):675-689, + * Oct 1997. + * + * http://www.cs.cmu.edu/~hzhang/papers/TON-97-Oct.ps.gz + * + * [3] I. Stoica and H. Abdel-Wahab, ``Earliest Eligible Virtual Deadline + * First: A Flexible and Accurate Mechanism for Proportional Share + * Resource Allocation,'' technical report. + * + * http://www.cs.berkeley.edu/~istoica/papers/eevdf-tr-95.pdf + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include "blk.h" +#include "bfq.h" + +/* Expiration time of sync (0) and async (1) requests, in ns. */ +static const u64 bfq_fifo_expire[2] = { NSEC_PER_SEC / 4, NSEC_PER_SEC / 8 }; + +/* Maximum backwards seek, in KiB. */ +static const int bfq_back_max = (16 * 1024); + +/* Penalty of a backwards seek, in number of sectors. */ +static const int bfq_back_penalty = 2; + +/* Idling period duration, in ns. */ +static u32 bfq_slice_idle = (NSEC_PER_SEC / 125); + +/* Minimum number of assigned budgets for which stats are safe to compute. */ +static const int bfq_stats_min_budgets = 194; + +/* Default maximum budget values, in sectors and number of requests. */ +static const int bfq_default_max_budget = (16 * 1024); + +/* + * Async to sync throughput distribution is controlled as follows: + * when an async request is served, the entity is charged the number + * of sectors of the request, multiplied by the factor below + */ +static const int bfq_async_charge_factor = 10; + +/* Default timeout values, in jiffies, approximating CFQ defaults. */ +static const int bfq_timeout = (HZ / 8); + +static struct kmem_cache *bfq_pool; + +/* Below this threshold (in ns), we consider thinktime immediate. */ +#define BFQ_MIN_TT (2 * NSEC_PER_MSEC) + +/* hw_tag detection: parallel requests threshold and min samples needed. */ +#define BFQ_HW_QUEUE_THRESHOLD 4 +#define BFQ_HW_QUEUE_SAMPLES 32 + +#define BFQQ_SEEK_THR (sector_t)(8 * 100) +#define BFQQ_SECT_THR_NONROT (sector_t)(2 * 32) +#define BFQQ_CLOSE_THR (sector_t)(8 * 1024) +#define BFQQ_SEEKY(bfqq) (hweight32(bfqq->seek_history) > 32/8) + +/* Min number of samples required to perform peak-rate update */ +#define BFQ_RATE_MIN_SAMPLES 32 +/* Min observation time interval required to perform a peak-rate update (ns) */ +#define BFQ_RATE_MIN_INTERVAL (300*NSEC_PER_MSEC) +/* Target observation time interval for a peak-rate update (ns) */ +#define BFQ_RATE_REF_INTERVAL NSEC_PER_SEC + +/* Shift used for peak rate fixed precision calculations. */ +#define BFQ_RATE_SHIFT 16 + +/* + * By default, BFQ computes the duration of the weight raising for + * interactive applications automatically, using the following formula: + * duration = (R / r) * T, where r is the peak rate of the device, and + * R and T are two reference parameters. + * In particular, R is the peak rate of the reference device (see below), + * and T is a reference time: given the systems that are likely to be + * installed on the reference device according to its speed class, T is + * about the maximum time needed, under BFQ and while reading two files in + * parallel, to load typical large applications on these systems. + * In practice, the slower/faster the device at hand is, the more/less it + * takes to load applications with respect to the reference device. + * Accordingly, the longer/shorter BFQ grants weight raising to interactive + * applications. + * + * BFQ uses four different reference pairs (R, T), depending on: + * . whether the device is rotational or non-rotational; + * . whether the device is slow, such as old or portable HDDs, as well as + * SD cards, or fast, such as newer HDDs and SSDs. + * + * The device's speed class is dynamically (re)detected in + * bfq_update_peak_rate() every time the estimated peak rate is updated. + * + * In the following definitions, R_slow[0]/R_fast[0] and + * T_slow[0]/T_fast[0] are the reference values for a slow/fast + * rotational device, whereas R_slow[1]/R_fast[1] and + * T_slow[1]/T_fast[1] are the reference values for a slow/fast + * non-rotational device. Finally, device_speed_thresh are the + * thresholds used to switch between speed classes. The reference + * rates are not the actual peak rates of the devices used as a + * reference, but slightly lower values. The reason for using these + * slightly lower values is that the peak-rate estimator tends to + * yield slightly lower values than the actual peak rate (it can yield + * the actual peak rate only if there is only one process doing I/O, + * and the process does sequential I/O). + * + * Both the reference peak rates and the thresholds are measured in + * sectors/usec, left-shifted by BFQ_RATE_SHIFT. + */ +static int R_slow[2] = {1000, 10700}; +static int R_fast[2] = {14000, 33000}; +/* + * To improve readability, a conversion function is used to initialize the + * following arrays, which entails that they can be initialized only in a + * function. + */ +static int T_slow[2]; +static int T_fast[2]; +static int device_speed_thresh[2]; + +#define BFQ_SERVICE_TREE_INIT ((struct bfq_service_tree) \ + { RB_ROOT, RB_ROOT, NULL, NULL, 0, 0 }) + +#define RQ_BIC(rq) ((struct bfq_io_cq *) (rq)->elv.priv[0]) +#define RQ_BFQQ(rq) ((rq)->elv.priv[1]) + +static void bfq_schedule_dispatch(struct bfq_data *bfqd); + +#include "bfq-ioc.c" +#include "bfq-sched.c" +#include "bfq-cgroup-included.c" + +#define bfq_class_idle(bfqq) ((bfqq)->ioprio_class == IOPRIO_CLASS_IDLE) +#define bfq_class_rt(bfqq) ((bfqq)->ioprio_class == IOPRIO_CLASS_RT) + +#define bfq_sample_valid(samples) ((samples) > 80) + +/* + * Scheduler run of queue, if there are requests pending and no one in the + * driver that will restart queueing. + */ +static void bfq_schedule_dispatch(struct bfq_data *bfqd) +{ + if (bfqd->queued != 0) { + bfq_log(bfqd, "schedule dispatch"); + kblockd_schedule_work(&bfqd->unplug_work); + } +} + +/* + * Lifted from AS - choose which of rq1 and rq2 that is best served now. + * We choose the request that is closesr to the head right now. Distance + * behind the head is penalized and only allowed to a certain extent. + */ +static struct request *bfq_choose_req(struct bfq_data *bfqd, + struct request *rq1, + struct request *rq2, + sector_t last) +{ + sector_t s1, s2, d1 = 0, d2 = 0; + unsigned long back_max; +#define BFQ_RQ1_WRAP 0x01 /* request 1 wraps */ +#define BFQ_RQ2_WRAP 0x02 /* request 2 wraps */ + unsigned int wrap = 0; /* bit mask: requests behind the disk head? */ + + if (!rq1 || rq1 == rq2) + return rq2; + if (!rq2) + return rq1; + + if (rq_is_sync(rq1) && !rq_is_sync(rq2)) + return rq1; + else if (rq_is_sync(rq2) && !rq_is_sync(rq1)) + return rq2; + if ((rq1->cmd_flags & REQ_META) && !(rq2->cmd_flags & REQ_META)) + return rq1; + else if ((rq2->cmd_flags & REQ_META) && !(rq1->cmd_flags & REQ_META)) + return rq2; + + s1 = blk_rq_pos(rq1); + s2 = blk_rq_pos(rq2); + + /* + * By definition, 1KiB is 2 sectors. + */ + back_max = bfqd->bfq_back_max * 2; + + /* + * Strict one way elevator _except_ in the case where we allow + * short backward seeks which are biased as twice the cost of a + * similar forward seek. + */ + if (s1 >= last) + d1 = s1 - last; + else if (s1 + back_max >= last) + d1 = (last - s1) * bfqd->bfq_back_penalty; + else + wrap |= BFQ_RQ1_WRAP; + + if (s2 >= last) + d2 = s2 - last; + else if (s2 + back_max >= last) + d2 = (last - s2) * bfqd->bfq_back_penalty; + else + wrap |= BFQ_RQ2_WRAP; + + /* Found required data */ + + /* + * By doing switch() on the bit mask "wrap" we avoid having to + * check two variables for all permutations: --> faster! + */ + switch (wrap) { + case 0: /* common case for CFQ: rq1 and rq2 not wrapped */ + if (d1 < d2) + return rq1; + else if (d2 < d1) + return rq2; + + if (s1 >= s2) + return rq1; + else + return rq2; + + case BFQ_RQ2_WRAP: + return rq1; + case BFQ_RQ1_WRAP: + return rq2; + case (BFQ_RQ1_WRAP|BFQ_RQ2_WRAP): /* both rqs wrapped */ + default: + /* + * Since both rqs are wrapped, + * start with the one that's further behind head + * (--> only *one* back seek required), + * since back seek takes more time than forward. + */ + if (s1 <= s2) + return rq1; + else + return rq2; + } +} + +static struct bfq_queue * +bfq_rq_pos_tree_lookup(struct bfq_data *bfqd, struct rb_root *root, + sector_t sector, struct rb_node **ret_parent, + struct rb_node ***rb_link) +{ + struct rb_node **p, *parent; + struct bfq_queue *bfqq = NULL; + + parent = NULL; + p = &root->rb_node; + while (*p) { + struct rb_node **n; + + parent = *p; + bfqq = rb_entry(parent, struct bfq_queue, pos_node); + + /* + * Sort strictly based on sector. Smallest to the left, + * largest to the right. + */ + if (sector > blk_rq_pos(bfqq->next_rq)) + n = &(*p)->rb_right; + else if (sector < blk_rq_pos(bfqq->next_rq)) + n = &(*p)->rb_left; + else + break; + p = n; + bfqq = NULL; + } + + *ret_parent = parent; + if (rb_link) + *rb_link = p; + + bfq_log(bfqd, "rq_pos_tree_lookup %llu: returning %d", + (unsigned long long) sector, + bfqq ? bfqq->pid : 0); + + return bfqq; +} + +static void bfq_pos_tree_add_move(struct bfq_data *bfqd, struct bfq_queue *bfqq) +{ + struct rb_node **p, *parent; + struct bfq_queue *__bfqq; + + if (bfqq->pos_root) { + rb_erase(&bfqq->pos_node, bfqq->pos_root); + bfqq->pos_root = NULL; + } + + if (bfq_class_idle(bfqq)) + return; + if (!bfqq->next_rq) + return; + + bfqq->pos_root = &bfq_bfqq_to_bfqg(bfqq)->rq_pos_tree; + __bfqq = bfq_rq_pos_tree_lookup(bfqd, bfqq->pos_root, + blk_rq_pos(bfqq->next_rq), &parent, &p); + if (!__bfqq) { + rb_link_node(&bfqq->pos_node, parent, p); + rb_insert_color(&bfqq->pos_node, bfqq->pos_root); + } else + bfqq->pos_root = NULL; +} + +/* + * Tell whether there are active queues or groups with differentiated weights. + */ +static bool bfq_differentiated_weights(struct bfq_data *bfqd) +{ + /* + * For weights to differ, at least one of the trees must contain + * at least two nodes. + */ + return (!RB_EMPTY_ROOT(&bfqd->queue_weights_tree) && + (bfqd->queue_weights_tree.rb_node->rb_left || + bfqd->queue_weights_tree.rb_node->rb_right) +#ifdef BFQ_GROUP_IOSCHED_ENABLED + ) || + (!RB_EMPTY_ROOT(&bfqd->group_weights_tree) && + (bfqd->group_weights_tree.rb_node->rb_left || + bfqd->group_weights_tree.rb_node->rb_right) +#endif + ); +} + +/* + * The following function returns true if every queue must receive the + * same share of the throughput (this condition is used when deciding + * whether idling may be disabled, see the comments in the function + * bfq_bfqq_may_idle()). + * + * Such a scenario occurs when: + * 1) all active queues have the same weight, + * 2) all active groups at the same level in the groups tree have the same + * weight, + * 3) all active groups at the same level in the groups tree have the same + * number of children. + * + * Unfortunately, keeping the necessary state for evaluating exactly the + * above symmetry conditions would be quite complex and time-consuming. + * Therefore this function evaluates, instead, the following stronger + * sub-conditions, for which it is much easier to maintain the needed + * state: + * 1) all active queues have the same weight, + * 2) all active groups have the same weight, + * 3) all active groups have at most one active child each. + * In particular, the last two conditions are always true if hierarchical + * support and the cgroups interface are not enabled, thus no state needs + * to be maintained in this case. + */ +static bool bfq_symmetric_scenario(struct bfq_data *bfqd) +{ + return !bfq_differentiated_weights(bfqd); +} + +/* + * If the weight-counter tree passed as input contains no counter for + * the weight of the input entity, then add that counter; otherwise just + * increment the existing counter. + * + * Note that weight-counter trees contain few nodes in mostly symmetric + * scenarios. For example, if all queues have the same weight, then the + * weight-counter tree for the queues may contain at most one node. + * This holds even if low_latency is on, because weight-raised queues + * are not inserted in the tree. + * In most scenarios, the rate at which nodes are created/destroyed + * should be low too. + */ +static void bfq_weights_tree_add(struct bfq_data *bfqd, + struct bfq_entity *entity, + struct rb_root *root) +{ + struct rb_node **new = &(root->rb_node), *parent = NULL; + + /* + * Do not insert if the entity is already associated with a + * counter, which happens if: + * 1) the entity is associated with a queue, + * 2) a request arrival has caused the queue to become both + * non-weight-raised, and hence change its weight, and + * backlogged; in this respect, each of the two events + * causes an invocation of this function, + * 3) this is the invocation of this function caused by the + * second event. This second invocation is actually useless, + * and we handle this fact by exiting immediately. More + * efficient or clearer solutions might possibly be adopted. + */ + if (entity->weight_counter) + return; + + while (*new) { + struct bfq_weight_counter *__counter = container_of(*new, + struct bfq_weight_counter, + weights_node); + parent = *new; + + if (entity->weight == __counter->weight) { + entity->weight_counter = __counter; + goto inc_counter; + } + if (entity->weight < __counter->weight) + new = &((*new)->rb_left); + else + new = &((*new)->rb_right); + } + + entity->weight_counter = kzalloc(sizeof(struct bfq_weight_counter), + GFP_ATOMIC); + + /* + * In the unlucky event of an allocation failure, we just + * exit. This will cause the weight of entity to not be + * considered in bfq_differentiated_weights, which, in its + * turn, causes the scenario to be deemed wrongly symmetric in + * case entity's weight would have been the only weight making + * the scenario asymmetric. On the bright side, no unbalance + * will however occur when entity becomes inactive again (the + * invocation of this function is triggered by an activation + * of entity). In fact, bfq_weights_tree_remove does nothing + * if !entity->weight_counter. + */ + if (unlikely(!entity->weight_counter)) + return; + + entity->weight_counter->weight = entity->weight; + rb_link_node(&entity->weight_counter->weights_node, parent, new); + rb_insert_color(&entity->weight_counter->weights_node, root); + +inc_counter: + entity->weight_counter->num_active++; +} + +/* + * Decrement the weight counter associated with the entity, and, if the + * counter reaches 0, remove the counter from the tree. + * See the comments to the function bfq_weights_tree_add() for considerations + * about overhead. + */ +static void bfq_weights_tree_remove(struct bfq_data *bfqd, + struct bfq_entity *entity, + struct rb_root *root) +{ + if (!entity->weight_counter) + return; + + BUG_ON(RB_EMPTY_ROOT(root)); + BUG_ON(entity->weight_counter->weight != entity->weight); + + BUG_ON(!entity->weight_counter->num_active); + entity->weight_counter->num_active--; + if (entity->weight_counter->num_active > 0) + goto reset_entity_pointer; + + rb_erase(&entity->weight_counter->weights_node, root); + kfree(entity->weight_counter); + +reset_entity_pointer: + entity->weight_counter = NULL; +} + +/* + * Return expired entry, or NULL to just start from scratch in rbtree. + */ +static struct request *bfq_check_fifo(struct bfq_queue *bfqq, + struct request *last) +{ + struct request *rq; + + if (bfq_bfqq_fifo_expire(bfqq)) + return NULL; + + bfq_mark_bfqq_fifo_expire(bfqq); + + rq = rq_entry_fifo(bfqq->fifo.next); + + if (rq == last || ktime_get_ns() < rq->fifo_time) + return NULL; + + bfq_log_bfqq(bfqq->bfqd, bfqq, "check_fifo: returned %p", rq); + BUG_ON(RB_EMPTY_NODE(&rq->rb_node)); + return rq; +} + +static struct request *bfq_find_next_rq(struct bfq_data *bfqd, + struct bfq_queue *bfqq, + struct request *last) +{ + struct rb_node *rbnext = rb_next(&last->rb_node); + struct rb_node *rbprev = rb_prev(&last->rb_node); + struct request *next, *prev = NULL; + + BUG_ON(list_empty(&bfqq->fifo)); + + /* Follow expired path, else get first next available. */ + next = bfq_check_fifo(bfqq, last); + if (next) { + BUG_ON(next == last); + return next; + } + + BUG_ON(RB_EMPTY_NODE(&last->rb_node)); + + if (rbprev) + prev = rb_entry_rq(rbprev); + + if (rbnext) + next = rb_entry_rq(rbnext); + else { + rbnext = rb_first(&bfqq->sort_list); + if (rbnext && rbnext != &last->rb_node) + next = rb_entry_rq(rbnext); + } + + return bfq_choose_req(bfqd, next, prev, blk_rq_pos(last)); +} + +/* see the definition of bfq_async_charge_factor for details */ +static unsigned long bfq_serv_to_charge(struct request *rq, + struct bfq_queue *bfqq) +{ + if (bfq_bfqq_sync(bfqq) || bfqq->wr_coeff > 1) + return blk_rq_sectors(rq); + + /* + * If there are no weight-raised queues, then amplify service + * by just the async charge factor; otherwise amplify service + * by twice the async charge factor, to further reduce latency + * for weight-raised queues. + */ + if (bfqq->bfqd->wr_busy_queues == 0) + return blk_rq_sectors(rq) * bfq_async_charge_factor; + + return blk_rq_sectors(rq) * 2 * bfq_async_charge_factor; +} + +/** + * bfq_updated_next_req - update the queue after a new next_rq selection. + * @bfqd: the device data the queue belongs to. + * @bfqq: the queue to update. + * + * If the first request of a queue changes we make sure that the queue + * has enough budget to serve at least its first request (if the + * request has grown). We do this because if the queue has not enough + * budget for its first request, it has to go through two dispatch + * rounds to actually get it dispatched. + */ +static void bfq_updated_next_req(struct bfq_data *bfqd, + struct bfq_queue *bfqq) +{ + struct bfq_entity *entity = &bfqq->entity; + struct bfq_service_tree *st = bfq_entity_service_tree(entity); + struct request *next_rq = bfqq->next_rq; + unsigned long new_budget; + + if (!next_rq) + return; + + if (bfqq == bfqd->in_service_queue) + /* + * In order not to break guarantees, budgets cannot be + * changed after an entity has been selected. + */ + return; + + BUG_ON(entity->tree != &st->active); + BUG_ON(entity == entity->sched_data->in_service_entity); + + new_budget = max_t(unsigned long, bfqq->max_budget, + bfq_serv_to_charge(next_rq, bfqq)); + if (entity->budget != new_budget) { + entity->budget = new_budget; + bfq_log_bfqq(bfqd, bfqq, "updated next rq: new budget %lu", + new_budget); + bfq_requeue_bfqq(bfqd, bfqq, false); + } +} + +static unsigned int bfq_wr_duration(struct bfq_data *bfqd) +{ + u64 dur; + + if (bfqd->bfq_wr_max_time > 0) + return bfqd->bfq_wr_max_time; + + dur = bfqd->RT_prod; + do_div(dur, bfqd->peak_rate); + + /* + * Limit duration between 3 and 13 seconds. Tests show that + * higher values than 13 seconds often yield the opposite of + * the desired result, i.e., worsen responsiveness by letting + * non-interactive and non-soft-real-time applications + * preserve weight raising for a too long time interval. + * + * On the other end, lower values than 3 seconds make it + * difficult for most interactive tasks to complete their jobs + * before weight-raising finishes. + */ + if (dur > msecs_to_jiffies(13000)) + dur = msecs_to_jiffies(13000); + else if (dur < msecs_to_jiffies(3000)) + dur = msecs_to_jiffies(3000); + + return dur; +} + +static void +bfq_bfqq_resume_state(struct bfq_queue *bfqq, struct bfq_data *bfqd, + struct bfq_io_cq *bic, bool bfq_already_existing) +{ + unsigned int old_wr_coeff; + bool busy = bfq_already_existing && bfq_bfqq_busy(bfqq); + + if (bic->saved_has_short_ttime) + bfq_mark_bfqq_has_short_ttime(bfqq); + else + bfq_clear_bfqq_has_short_ttime(bfqq); + + if (bic->saved_IO_bound) + bfq_mark_bfqq_IO_bound(bfqq); + else + bfq_clear_bfqq_IO_bound(bfqq); + + if (unlikely(busy)) + old_wr_coeff = bfqq->wr_coeff; + + bfqq->wr_coeff = bic->saved_wr_coeff; + bfqq->wr_start_at_switch_to_srt = bic->saved_wr_start_at_switch_to_srt; + BUG_ON(time_is_after_jiffies(bfqq->wr_start_at_switch_to_srt)); + bfqq->last_wr_start_finish = bic->saved_last_wr_start_finish; + bfqq->wr_cur_max_time = bic->saved_wr_cur_max_time; + BUG_ON(time_is_after_jiffies(bfqq->last_wr_start_finish)); + + if (bfqq->wr_coeff > 1 && (bfq_bfqq_in_large_burst(bfqq) || + time_is_before_jiffies(bfqq->last_wr_start_finish + + bfqq->wr_cur_max_time))) { + bfq_log_bfqq(bfqq->bfqd, bfqq, + "resume state: switching off wr (%lu + %lu < %lu)", + bfqq->last_wr_start_finish, bfqq->wr_cur_max_time, + jiffies); + + bfqq->wr_coeff = 1; + } + + /* make sure weight will be updated, however we got here */ + bfqq->entity.prio_changed = 1; + + if (likely(!busy)) + return; + + if (old_wr_coeff == 1 && bfqq->wr_coeff > 1) { + bfqd->wr_busy_queues++; + BUG_ON(bfqd->wr_busy_queues > bfqd->busy_queues); + } else if (old_wr_coeff > 1 && bfqq->wr_coeff == 1) { + bfqd->wr_busy_queues--; + BUG_ON(bfqd->wr_busy_queues < 0); + } +} + +static int bfqq_process_refs(struct bfq_queue *bfqq) +{ + int process_refs, io_refs; + + lockdep_assert_held(bfqq->bfqd->queue->queue_lock); + + io_refs = bfqq->allocated[READ] + bfqq->allocated[WRITE]; + process_refs = bfqq->ref - io_refs - bfqq->entity.on_st; + BUG_ON(process_refs < 0); + return process_refs; +} + +/* Empty burst list and add just bfqq (see comments to bfq_handle_burst) */ +static void bfq_reset_burst_list(struct bfq_data *bfqd, struct bfq_queue *bfqq) +{ + struct bfq_queue *item; + struct hlist_node *n; + + hlist_for_each_entry_safe(item, n, &bfqd->burst_list, burst_list_node) + hlist_del_init(&item->burst_list_node); + hlist_add_head(&bfqq->burst_list_node, &bfqd->burst_list); + bfqd->burst_size = 1; + bfqd->burst_parent_entity = bfqq->entity.parent; +} + +/* Add bfqq to the list of queues in current burst (see bfq_handle_burst) */ +static void bfq_add_to_burst(struct bfq_data *bfqd, struct bfq_queue *bfqq) +{ + /* Increment burst size to take into account also bfqq */ + bfqd->burst_size++; + + bfq_log_bfqq(bfqd, bfqq, "add_to_burst %d", bfqd->burst_size); + + BUG_ON(bfqd->burst_size > bfqd->bfq_large_burst_thresh); + + if (bfqd->burst_size == bfqd->bfq_large_burst_thresh) { + struct bfq_queue *pos, *bfqq_item; + struct hlist_node *n; + + /* + * Enough queues have been activated shortly after each + * other to consider this burst as large. + */ + bfqd->large_burst = true; + bfq_log_bfqq(bfqd, bfqq, "add_to_burst: large burst started"); + + /* + * We can now mark all queues in the burst list as + * belonging to a large burst. + */ + hlist_for_each_entry(bfqq_item, &bfqd->burst_list, + burst_list_node) { + bfq_mark_bfqq_in_large_burst(bfqq_item); + bfq_log_bfqq(bfqd, bfqq_item, "marked in large burst"); + } + bfq_mark_bfqq_in_large_burst(bfqq); + bfq_log_bfqq(bfqd, bfqq, "marked in large burst"); + + /* + * From now on, and until the current burst finishes, any + * new queue being activated shortly after the last queue + * was inserted in the burst can be immediately marked as + * belonging to a large burst. So the burst list is not + * needed any more. Remove it. + */ + hlist_for_each_entry_safe(pos, n, &bfqd->burst_list, + burst_list_node) + hlist_del_init(&pos->burst_list_node); + } else /* + * Burst not yet large: add bfqq to the burst list. Do + * not increment the ref counter for bfqq, because bfqq + * is removed from the burst list before freeing bfqq + * in put_queue. + */ + hlist_add_head(&bfqq->burst_list_node, &bfqd->burst_list); +} + +/* + * If many queues belonging to the same group happen to be created + * shortly after each other, then the processes associated with these + * queues have typically a common goal. In particular, bursts of queue + * creations are usually caused by services or applications that spawn + * many parallel threads/processes. Examples are systemd during boot, + * or git grep. To help these processes get their job done as soon as + * possible, it is usually better to not grant either weight-raising + * or device idling to their queues. + * + * In this comment we describe, firstly, the reasons why this fact + * holds, and, secondly, the next function, which implements the main + * steps needed to properly mark these queues so that they can then be + * treated in a different way. + * + * The above services or applications benefit mostly from a high + * throughput: the quicker the requests of the activated queues are + * cumulatively served, the sooner the target job of these queues gets + * completed. As a consequence, weight-raising any of these queues, + * which also implies idling the device for it, is almost always + * counterproductive. In most cases it just lowers throughput. + * + * On the other hand, a burst of queue creations may be caused also by + * the start of an application that does not consist of a lot of + * parallel I/O-bound threads. In fact, with a complex application, + * several short processes may need to be executed to start-up the + * application. In this respect, to start an application as quickly as + * possible, the best thing to do is in any case to privilege the I/O + * related to the application with respect to all other + * I/O. Therefore, the best strategy to start as quickly as possible + * an application that causes a burst of queue creations is to + * weight-raise all the queues created during the burst. This is the + * exact opposite of the best strategy for the other type of bursts. + * + * In the end, to take the best action for each of the two cases, the + * two types of bursts need to be distinguished. Fortunately, this + * seems relatively easy, by looking at the sizes of the bursts. In + * particular, we found a threshold such that only bursts with a + * larger size than that threshold are apparently caused by + * services or commands such as systemd or git grep. For brevity, + * hereafter we call just 'large' these bursts. BFQ *does not* + * weight-raise queues whose creation occurs in a large burst. In + * addition, for each of these queues BFQ performs or does not perform + * idling depending on which choice boosts the throughput more. The + * exact choice depends on the device and request pattern at + * hand. + * + * Unfortunately, false positives may occur while an interactive task + * is starting (e.g., an application is being started). The + * consequence is that the queues associated with the task do not + * enjoy weight raising as expected. Fortunately these false positives + * are very rare. They typically occur if some service happens to + * start doing I/O exactly when the interactive task starts. + * + * Turning back to the next function, it implements all the steps + * needed to detect the occurrence of a large burst and to properly + * mark all the queues belonging to it (so that they can then be + * treated in a different way). This goal is achieved by maintaining a + * "burst list" that holds, temporarily, the queues that belong to the + * burst in progress. The list is then used to mark these queues as + * belonging to a large burst if the burst does become large. The main + * steps are the following. + * + * . when the very first queue is created, the queue is inserted into the + * list (as it could be the first queue in a possible burst) + * + * . if the current burst has not yet become large, and a queue Q that does + * not yet belong to the burst is activated shortly after the last time + * at which a new queue entered the burst list, then the function appends + * Q to the burst list + * + * . if, as a consequence of the previous step, the burst size reaches + * the large-burst threshold, then + * + * . all the queues in the burst list are marked as belonging to a + * large burst + * + * . the burst list is deleted; in fact, the burst list already served + * its purpose (keeping temporarily track of the queues in a burst, + * so as to be able to mark them as belonging to a large burst in the + * previous sub-step), and now is not needed any more + * + * . the device enters a large-burst mode + * + * . if a queue Q that does not belong to the burst is created while + * the device is in large-burst mode and shortly after the last time + * at which a queue either entered the burst list or was marked as + * belonging to the current large burst, then Q is immediately marked + * as belonging to a large burst. + * + * . if a queue Q that does not belong to the burst is created a while + * later, i.e., not shortly after, than the last time at which a queue + * either entered the burst list or was marked as belonging to the + * current large burst, then the current burst is deemed as finished and: + * + * . the large-burst mode is reset if set + * + * . the burst list is emptied + * + * . Q is inserted in the burst list, as Q may be the first queue + * in a possible new burst (then the burst list contains just Q + * after this step). + */ +static void bfq_handle_burst(struct bfq_data *bfqd, struct bfq_queue *bfqq) +{ + /* + * If bfqq is already in the burst list or is part of a large + * burst, or finally has just been split, then there is + * nothing else to do. + */ + if (!hlist_unhashed(&bfqq->burst_list_node) || + bfq_bfqq_in_large_burst(bfqq) || + time_is_after_eq_jiffies(bfqq->split_time + + msecs_to_jiffies(10))) + return; + + /* + * If bfqq's creation happens late enough, or bfqq belongs to + * a different group than the burst group, then the current + * burst is finished, and related data structures must be + * reset. + * + * In this respect, consider the special case where bfqq is + * the very first queue created after BFQ is selected for this + * device. In this case, last_ins_in_burst and + * burst_parent_entity are not yet significant when we get + * here. But it is easy to verify that, whether or not the + * following condition is true, bfqq will end up being + * inserted into the burst list. In particular the list will + * happen to contain only bfqq. And this is exactly what has + * to happen, as bfqq may be the first queue of the first + * burst. + */ + if (time_is_before_jiffies(bfqd->last_ins_in_burst + + bfqd->bfq_burst_interval) || + bfqq->entity.parent != bfqd->burst_parent_entity) { + bfqd->large_burst = false; + bfq_reset_burst_list(bfqd, bfqq); + bfq_log_bfqq(bfqd, bfqq, + "handle_burst: late activation or different group"); + goto end; + } + + /* + * If we get here, then bfqq is being activated shortly after the + * last queue. So, if the current burst is also large, we can mark + * bfqq as belonging to this large burst immediately. + */ + if (bfqd->large_burst) { + bfq_log_bfqq(bfqd, bfqq, "handle_burst: marked in burst"); + bfq_mark_bfqq_in_large_burst(bfqq); + goto end; + } + + /* + * If we get here, then a large-burst state has not yet been + * reached, but bfqq is being activated shortly after the last + * queue. Then we add bfqq to the burst. + */ + bfq_add_to_burst(bfqd, bfqq); +end: + /* + * At this point, bfqq either has been added to the current + * burst or has caused the current burst to terminate and a + * possible new burst to start. In particular, in the second + * case, bfqq has become the first queue in the possible new + * burst. In both cases last_ins_in_burst needs to be moved + * forward. + */ + bfqd->last_ins_in_burst = jiffies; + +} + +static int bfq_bfqq_budget_left(struct bfq_queue *bfqq) +{ + struct bfq_entity *entity = &bfqq->entity; + + return entity->budget - entity->service; +} + +/* + * If enough samples have been computed, return the current max budget + * stored in bfqd, which is dynamically updated according to the + * estimated disk peak rate; otherwise return the default max budget + */ +static int bfq_max_budget(struct bfq_data *bfqd) +{ + if (bfqd->budgets_assigned < bfq_stats_min_budgets) + return bfq_default_max_budget; + else + return bfqd->bfq_max_budget; +} + +/* + * Return min budget, which is a fraction of the current or default + * max budget (trying with 1/32) + */ +static int bfq_min_budget(struct bfq_data *bfqd) +{ + if (bfqd->budgets_assigned < bfq_stats_min_budgets) + return bfq_default_max_budget / 32; + else + return bfqd->bfq_max_budget / 32; +} + +static void bfq_bfqq_expire(struct bfq_data *bfqd, + struct bfq_queue *bfqq, + bool compensate, + enum bfqq_expiration reason); + +/* + * The next function, invoked after the input queue bfqq switches from + * idle to busy, updates the budget of bfqq. The function also tells + * whether the in-service queue should be expired, by returning + * true. The purpose of expiring the in-service queue is to give bfqq + * the chance to possibly preempt the in-service queue, and the reason + * for preempting the in-service queue is to achieve one of the two + * goals below. + * + * 1. Guarantee to bfqq its reserved bandwidth even if bfqq has + * expired because it has remained idle. In particular, bfqq may have + * expired for one of the following two reasons: + * + * - BFQ_BFQQ_NO_MORE_REQUEST bfqq did not enjoy any device idling and + * did not make it to issue a new request before its last request + * was served; + * + * - BFQ_BFQQ_TOO_IDLE bfqq did enjoy device idling, but did not issue + * a new request before the expiration of the idling-time. + * + * Even if bfqq has expired for one of the above reasons, the process + * associated with the queue may be however issuing requests greedily, + * and thus be sensitive to the bandwidth it receives (bfqq may have + * remained idle for other reasons: CPU high load, bfqq not enjoying + * idling, I/O throttling somewhere in the path from the process to + * the I/O scheduler, ...). But if, after every expiration for one of + * the above two reasons, bfqq has to wait for the service of at least + * one full budget of another queue before being served again, then + * bfqq is likely to get a much lower bandwidth or resource time than + * its reserved ones. To address this issue, two countermeasures need + * to be taken. + * + * First, the budget and the timestamps of bfqq need to be updated in + * a special way on bfqq reactivation: they need to be updated as if + * bfqq did not remain idle and did not expire. In fact, if they are + * computed as if bfqq expired and remained idle until reactivation, + * then the process associated with bfqq is treated as if, instead of + * being greedy, it stopped issuing requests when bfqq remained idle, + * and restarts issuing requests only on this reactivation. In other + * words, the scheduler does not help the process recover the "service + * hole" between bfqq expiration and reactivation. As a consequence, + * the process receives a lower bandwidth than its reserved one. In + * contrast, to recover this hole, the budget must be updated as if + * bfqq was not expired at all before this reactivation, i.e., it must + * be set to the value of the remaining budget when bfqq was + * expired. Along the same line, timestamps need to be assigned the + * value they had the last time bfqq was selected for service, i.e., + * before last expiration. Thus timestamps need to be back-shifted + * with respect to their normal computation (see [1] for more details + * on this tricky aspect). + * + * Secondly, to allow the process to recover the hole, the in-service + * queue must be expired too, to give bfqq the chance to preempt it + * immediately. In fact, if bfqq has to wait for a full budget of the + * in-service queue to be completed, then it may become impossible to + * let the process recover the hole, even if the back-shifted + * timestamps of bfqq are lower than those of the in-service queue. If + * this happens for most or all of the holes, then the process may not + * receive its reserved bandwidth. In this respect, it is worth noting + * that, being the service of outstanding requests unpreemptible, a + * little fraction of the holes may however be unrecoverable, thereby + * causing a little loss of bandwidth. + * + * The last important point is detecting whether bfqq does need this + * bandwidth recovery. In this respect, the next function deems the + * process associated with bfqq greedy, and thus allows it to recover + * the hole, if: 1) the process is waiting for the arrival of a new + * request (which implies that bfqq expired for one of the above two + * reasons), and 2) such a request has arrived soon. The first + * condition is controlled through the flag non_blocking_wait_rq, + * while the second through the flag arrived_in_time. If both + * conditions hold, then the function computes the budget in the + * above-described special way, and signals that the in-service queue + * should be expired. Timestamp back-shifting is done later in + * __bfq_activate_entity. + * + * 2. Reduce latency. Even if timestamps are not backshifted to let + * the process associated with bfqq recover a service hole, bfqq may + * however happen to have, after being (re)activated, a lower finish + * timestamp than the in-service queue. That is, the next budget of + * bfqq may have to be completed before the one of the in-service + * queue. If this is the case, then preempting the in-service queue + * allows this goal to be achieved, apart from the unpreemptible, + * outstanding requests mentioned above. + * + * Unfortunately, regardless of which of the above two goals one wants + * to achieve, service trees need first to be updated to know whether + * the in-service queue must be preempted. To have service trees + * correctly updated, the in-service queue must be expired and + * rescheduled, and bfqq must be scheduled too. This is one of the + * most costly operations (in future versions, the scheduling + * mechanism may be re-designed in such a way to make it possible to + * know whether preemption is needed without needing to update service + * trees). In addition, queue preemptions almost always cause random + * I/O, and thus loss of throughput. Because of these facts, the next + * function adopts the following simple scheme to avoid both costly + * operations and too frequent preemptions: it requests the expiration + * of the in-service queue (unconditionally) only for queues that need + * to recover a hole, or that either are weight-raised or deserve to + * be weight-raised. + */ +static bool bfq_bfqq_update_budg_for_activation(struct bfq_data *bfqd, + struct bfq_queue *bfqq, + bool arrived_in_time, + bool wr_or_deserves_wr) +{ + struct bfq_entity *entity = &bfqq->entity; + + if (bfq_bfqq_non_blocking_wait_rq(bfqq) && arrived_in_time) { + /* + * We do not clear the flag non_blocking_wait_rq here, as + * the latter is used in bfq_activate_bfqq to signal + * that timestamps need to be back-shifted (and is + * cleared right after). + */ + + /* + * In next assignment we rely on that either + * entity->service or entity->budget are not updated + * on expiration if bfqq is empty (see + * __bfq_bfqq_recalc_budget). Thus both quantities + * remain unchanged after such an expiration, and the + * following statement therefore assigns to + * entity->budget the remaining budget on such an + * expiration. For clarity, entity->service is not + * updated on expiration in any case, and, in normal + * operation, is reset only when bfqq is selected for + * service (see bfq_get_next_queue). + */ + BUG_ON(bfqq->max_budget < 0); + entity->budget = min_t(unsigned long, + bfq_bfqq_budget_left(bfqq), + bfqq->max_budget); + + BUG_ON(entity->budget < 0); + return true; + } + + BUG_ON(bfqq->max_budget < 0); + entity->budget = max_t(unsigned long, bfqq->max_budget, + bfq_serv_to_charge(bfqq->next_rq, bfqq)); + BUG_ON(entity->budget < 0); + + bfq_clear_bfqq_non_blocking_wait_rq(bfqq); + return wr_or_deserves_wr; +} + +/* + * Return the farthest future time instant according to jiffies + * macros. + */ +static unsigned long bfq_greatest_from_now(void) +{ + return jiffies + MAX_JIFFY_OFFSET; +} + +/* + * Return the farthest past time instant according to jiffies + * macros. + */ +static unsigned long bfq_smallest_from_now(void) +{ + return jiffies - MAX_JIFFY_OFFSET; +} + +static void bfq_update_bfqq_wr_on_rq_arrival(struct bfq_data *bfqd, + struct bfq_queue *bfqq, + unsigned int old_wr_coeff, + bool wr_or_deserves_wr, + bool interactive, + bool in_burst, + bool soft_rt) +{ + if (old_wr_coeff == 1 && wr_or_deserves_wr) { + /* start a weight-raising period */ + if (interactive) { + bfqq->wr_coeff = bfqd->bfq_wr_coeff; + bfqq->wr_cur_max_time = bfq_wr_duration(bfqd); + } else { + /* + * No interactive weight raising in progress + * here: assign minus infinity to + * wr_start_at_switch_to_srt, to make sure + * that, at the end of the soft-real-time + * weight raising periods that is starting + * now, no interactive weight-raising period + * may be wrongly considered as still in + * progress (and thus actually started by + * mistake). + */ + bfqq->wr_start_at_switch_to_srt = + bfq_smallest_from_now(); + bfqq->wr_coeff = bfqd->bfq_wr_coeff * + BFQ_SOFTRT_WEIGHT_FACTOR; + bfqq->wr_cur_max_time = + bfqd->bfq_wr_rt_max_time; + } + /* + * If needed, further reduce budget to make sure it is + * close to bfqq's backlog, so as to reduce the + * scheduling-error component due to a too large + * budget. Do not care about throughput consequences, + * but only about latency. Finally, do not assign a + * too small budget either, to avoid increasing + * latency by causing too frequent expirations. + */ + bfqq->entity.budget = min_t(unsigned long, + bfqq->entity.budget, + 2 * bfq_min_budget(bfqd)); + + bfq_log_bfqq(bfqd, bfqq, + "wrais starting at %lu, rais_max_time %u", + jiffies, + jiffies_to_msecs(bfqq->wr_cur_max_time)); + } else if (old_wr_coeff > 1) { + if (interactive) { /* update wr coeff and duration */ + bfqq->wr_coeff = bfqd->bfq_wr_coeff; + bfqq->wr_cur_max_time = bfq_wr_duration(bfqd); + } else if (in_burst) { + bfqq->wr_coeff = 1; + bfq_log_bfqq(bfqd, bfqq, + "wrais ending at %lu, rais_max_time %u", + jiffies, + jiffies_to_msecs(bfqq-> + wr_cur_max_time)); + } else if (soft_rt) { + /* + * The application is now or still meeting the + * requirements for being deemed soft rt. We + * can then correctly and safely (re)charge + * the weight-raising duration for the + * application with the weight-raising + * duration for soft rt applications. + * + * In particular, doing this recharge now, i.e., + * before the weight-raising period for the + * application finishes, reduces the probability + * of the following negative scenario: + * 1) the weight of a soft rt application is + * raised at startup (as for any newly + * created application), + * 2) since the application is not interactive, + * at a certain time weight-raising is + * stopped for the application, + * 3) at that time the application happens to + * still have pending requests, and hence + * is destined to not have a chance to be + * deemed soft rt before these requests are + * completed (see the comments to the + * function bfq_bfqq_softrt_next_start() + * for details on soft rt detection), + * 4) these pending requests experience a high + * latency because the application is not + * weight-raised while they are pending. + */ + if (bfqq->wr_cur_max_time != + bfqd->bfq_wr_rt_max_time) { + bfqq->wr_start_at_switch_to_srt = + bfqq->last_wr_start_finish; + BUG_ON(time_is_after_jiffies(bfqq->last_wr_start_finish)); + + bfqq->wr_cur_max_time = + bfqd->bfq_wr_rt_max_time; + bfqq->wr_coeff = bfqd->bfq_wr_coeff * + BFQ_SOFTRT_WEIGHT_FACTOR; + bfq_log_bfqq(bfqd, bfqq, + "switching to soft_rt wr"); + } else + bfq_log_bfqq(bfqd, bfqq, + "moving forward soft_rt wr duration"); + bfqq->last_wr_start_finish = jiffies; + } + } +} + +static bool bfq_bfqq_idle_for_long_time(struct bfq_data *bfqd, + struct bfq_queue *bfqq) +{ + return bfqq->dispatched == 0 && + time_is_before_jiffies( + bfqq->budget_timeout + + bfqd->bfq_wr_min_idle_time); +} + +static void bfq_bfqq_handle_idle_busy_switch(struct bfq_data *bfqd, + struct bfq_queue *bfqq, + int old_wr_coeff, + struct request *rq, + bool *interactive) +{ + bool soft_rt, in_burst, wr_or_deserves_wr, + bfqq_wants_to_preempt, + idle_for_long_time = bfq_bfqq_idle_for_long_time(bfqd, bfqq), + /* + * See the comments on + * bfq_bfqq_update_budg_for_activation for + * details on the usage of the next variable. + */ + arrived_in_time = ktime_get_ns() <= + RQ_BIC(rq)->ttime.last_end_request + + bfqd->bfq_slice_idle * 3; + + bfq_log_bfqq(bfqd, bfqq, + "bfq_add_request non-busy: " + "jiffies %lu, in_time %d, idle_long %d busyw %d " + "wr_coeff %u", + jiffies, arrived_in_time, + idle_for_long_time, + bfq_bfqq_non_blocking_wait_rq(bfqq), + old_wr_coeff); + + BUG_ON(bfqq->entity.budget < bfqq->entity.service); + + BUG_ON(bfqq == bfqd->in_service_queue); + bfqg_stats_update_io_add(bfqq_group(RQ_BFQQ(rq)), bfqq, rq->cmd_flags); + + /* + * bfqq deserves to be weight-raised if: + * - it is sync, + * - it does not belong to a large burst, + * - it has been idle for enough time or is soft real-time, + * - is linked to a bfq_io_cq (it is not shared in any sense) + */ + in_burst = bfq_bfqq_in_large_burst(bfqq); + soft_rt = bfqd->bfq_wr_max_softrt_rate > 0 && + !in_burst && + time_is_before_jiffies(bfqq->soft_rt_next_start); + *interactive = + !in_burst && + idle_for_long_time; + wr_or_deserves_wr = bfqd->low_latency && + (bfqq->wr_coeff > 1 || + (bfq_bfqq_sync(bfqq) && + bfqq->bic && (*interactive || soft_rt))); + + bfq_log_bfqq(bfqd, bfqq, + "bfq_add_request: " + "in_burst %d, " + "soft_rt %d (next %lu), inter %d, bic %p", + bfq_bfqq_in_large_burst(bfqq), soft_rt, + bfqq->soft_rt_next_start, + *interactive, + bfqq->bic); + + /* + * Using the last flag, update budget and check whether bfqq + * may want to preempt the in-service queue. + */ + bfqq_wants_to_preempt = + bfq_bfqq_update_budg_for_activation(bfqd, bfqq, + arrived_in_time, + wr_or_deserves_wr); + + /* + * If bfqq happened to be activated in a burst, but has been + * idle for much more than an interactive queue, then we + * assume that, in the overall I/O initiated in the burst, the + * I/O associated with bfqq is finished. So bfqq does not need + * to be treated as a queue belonging to a burst + * anymore. Accordingly, we reset bfqq's in_large_burst flag + * if set, and remove bfqq from the burst list if it's + * there. We do not decrement burst_size, because the fact + * that bfqq does not need to belong to the burst list any + * more does not invalidate the fact that bfqq was created in + * a burst. + */ + if (likely(!bfq_bfqq_just_created(bfqq)) && + idle_for_long_time && + time_is_before_jiffies( + bfqq->budget_timeout + + msecs_to_jiffies(10000))) { + hlist_del_init(&bfqq->burst_list_node); + bfq_clear_bfqq_in_large_burst(bfqq); + } + + bfq_clear_bfqq_just_created(bfqq); + + if (!bfq_bfqq_IO_bound(bfqq)) { + if (arrived_in_time) { + bfqq->requests_within_timer++; + if (bfqq->requests_within_timer >= + bfqd->bfq_requests_within_timer) + bfq_mark_bfqq_IO_bound(bfqq); + } else + bfqq->requests_within_timer = 0; + bfq_log_bfqq(bfqd, bfqq, "requests in time %d", + bfqq->requests_within_timer); + } + + if (bfqd->low_latency) { + if (unlikely(time_is_after_jiffies(bfqq->split_time))) + /* wraparound */ + bfqq->split_time = + jiffies - bfqd->bfq_wr_min_idle_time - 1; + + if (time_is_before_jiffies(bfqq->split_time + + bfqd->bfq_wr_min_idle_time)) { + bfq_update_bfqq_wr_on_rq_arrival(bfqd, bfqq, + old_wr_coeff, + wr_or_deserves_wr, + *interactive, + in_burst, + soft_rt); + + if (old_wr_coeff != bfqq->wr_coeff) + bfqq->entity.prio_changed = 1; + } + } + + bfqq->last_idle_bklogged = jiffies; + bfqq->service_from_backlogged = 0; + bfq_clear_bfqq_softrt_update(bfqq); + + bfq_add_bfqq_busy(bfqd, bfqq); + + /* + * Expire in-service queue only if preemption may be needed + * for guarantees. In this respect, the function + * next_queue_may_preempt just checks a simple, necessary + * condition, and not a sufficient condition based on + * timestamps. In fact, for the latter condition to be + * evaluated, timestamps would need first to be updated, and + * this operation is quite costly (see the comments on the + * function bfq_bfqq_update_budg_for_activation). + */ + if (bfqd->in_service_queue && bfqq_wants_to_preempt && + bfqd->in_service_queue->wr_coeff < bfqq->wr_coeff && + next_queue_may_preempt(bfqd)) { + struct bfq_queue *in_serv = + bfqd->in_service_queue; + BUG_ON(in_serv == bfqq); + + bfq_bfqq_expire(bfqd, bfqd->in_service_queue, + false, BFQ_BFQQ_PREEMPTED); + } +} + +static void bfq_add_request(struct request *rq) +{ + struct bfq_queue *bfqq = RQ_BFQQ(rq); + struct bfq_data *bfqd = bfqq->bfqd; + struct request *next_rq, *prev; + unsigned int old_wr_coeff = bfqq->wr_coeff; + bool interactive = false; + + bfq_log_bfqq(bfqd, bfqq, "add_request: size %u %s", + blk_rq_sectors(rq), rq_is_sync(rq) ? "S" : "A"); + + if (bfqq->wr_coeff > 1) /* queue is being weight-raised */ + bfq_log_bfqq(bfqd, bfqq, + "raising period dur %u/%u msec, old coeff %u, w %d(%d)", + jiffies_to_msecs(jiffies - bfqq->last_wr_start_finish), + jiffies_to_msecs(bfqq->wr_cur_max_time), + bfqq->wr_coeff, + bfqq->entity.weight, bfqq->entity.orig_weight); + + bfqq->queued[rq_is_sync(rq)]++; + bfqd->queued++; + + elv_rb_add(&bfqq->sort_list, rq); + + /* + * Check if this request is a better next-to-serve candidate. + */ + prev = bfqq->next_rq; + next_rq = bfq_choose_req(bfqd, bfqq->next_rq, rq, bfqd->last_position); + BUG_ON(!next_rq); + bfqq->next_rq = next_rq; + + /* + * Adjust priority tree position, if next_rq changes. + */ + if (prev != bfqq->next_rq) + bfq_pos_tree_add_move(bfqd, bfqq); + + if (!bfq_bfqq_busy(bfqq)) /* switching to busy ... */ + bfq_bfqq_handle_idle_busy_switch(bfqd, bfqq, old_wr_coeff, + rq, &interactive); + else { + if (bfqd->low_latency && old_wr_coeff == 1 && !rq_is_sync(rq) && + time_is_before_jiffies( + bfqq->last_wr_start_finish + + bfqd->bfq_wr_min_inter_arr_async)) { + bfqq->wr_coeff = bfqd->bfq_wr_coeff; + bfqq->wr_cur_max_time = bfq_wr_duration(bfqd); + + bfqd->wr_busy_queues++; + BUG_ON(bfqd->wr_busy_queues > bfqd->busy_queues); + bfqq->entity.prio_changed = 1; + bfq_log_bfqq(bfqd, bfqq, + "non-idle wrais starting, " + "wr_max_time %u wr_busy %d", + jiffies_to_msecs(bfqq->wr_cur_max_time), + bfqd->wr_busy_queues); + } + if (prev != bfqq->next_rq) + bfq_updated_next_req(bfqd, bfqq); + } + + /* + * Assign jiffies to last_wr_start_finish in the following + * cases: + * + * . if bfqq is not going to be weight-raised, because, for + * non weight-raised queues, last_wr_start_finish stores the + * arrival time of the last request; as of now, this piece + * of information is used only for deciding whether to + * weight-raise async queues + * + * . if bfqq is not weight-raised, because, if bfqq is now + * switching to weight-raised, then last_wr_start_finish + * stores the time when weight-raising starts + * + * . if bfqq is interactive, because, regardless of whether + * bfqq is currently weight-raised, the weight-raising + * period must start or restart (this case is considered + * separately because it is not detected by the above + * conditions, if bfqq is already weight-raised) + * + * last_wr_start_finish has to be updated also if bfqq is soft + * real-time, because the weight-raising period is constantly + * restarted on idle-to-busy transitions for these queues, but + * this is already done in bfq_bfqq_handle_idle_busy_switch if + * needed. + */ + if (bfqd->low_latency && + (old_wr_coeff == 1 || bfqq->wr_coeff == 1 || interactive)) + bfqq->last_wr_start_finish = jiffies; +} + +static struct request *bfq_find_rq_fmerge(struct bfq_data *bfqd, + struct bio *bio) +{ + struct task_struct *tsk = current; + struct bfq_io_cq *bic; + struct bfq_queue *bfqq; + + bic = bfq_bic_lookup(bfqd, tsk->io_context); + if (!bic) + return NULL; + + bfqq = bic_to_bfqq(bic, op_is_sync(bio->bi_opf)); + if (bfqq) + return elv_rb_find(&bfqq->sort_list, bio_end_sector(bio)); + + return NULL; +} + +static sector_t get_sdist(sector_t last_pos, struct request *rq) +{ + sector_t sdist = 0; + + if (last_pos) { + if (last_pos < blk_rq_pos(rq)) + sdist = blk_rq_pos(rq) - last_pos; + else + sdist = last_pos - blk_rq_pos(rq); + } + + return sdist; +} + +static void bfq_activate_request(struct request_queue *q, struct request *rq) +{ + struct bfq_data *bfqd = q->elevator->elevator_data; + bfqd->rq_in_driver++; +} + +static void bfq_deactivate_request(struct request_queue *q, struct request *rq) +{ + struct bfq_data *bfqd = q->elevator->elevator_data; + + BUG_ON(bfqd->rq_in_driver == 0); + bfqd->rq_in_driver--; +} + +static void bfq_remove_request(struct request *rq) +{ + struct bfq_queue *bfqq = RQ_BFQQ(rq); + struct bfq_data *bfqd = bfqq->bfqd; + const int sync = rq_is_sync(rq); + + BUG_ON(bfqq->entity.service > bfqq->entity.budget && + bfqq == bfqd->in_service_queue); + + if (bfqq->next_rq == rq) { + bfqq->next_rq = bfq_find_next_rq(bfqd, bfqq, rq); + bfq_updated_next_req(bfqd, bfqq); + } + + if (rq->queuelist.prev != &rq->queuelist) + list_del_init(&rq->queuelist); + BUG_ON(bfqq->queued[sync] == 0); + bfqq->queued[sync]--; + bfqd->queued--; + elv_rb_del(&bfqq->sort_list, rq); + + if (RB_EMPTY_ROOT(&bfqq->sort_list)) { + bfqq->next_rq = NULL; + + BUG_ON(bfqq->entity.budget < 0); + + if (bfq_bfqq_busy(bfqq) && bfqq != bfqd->in_service_queue) { + BUG_ON(bfqq->ref < 2); /* referred by rq and on tree */ + bfq_del_bfqq_busy(bfqd, bfqq, false); + /* + * bfqq emptied. In normal operation, when + * bfqq is empty, bfqq->entity.service and + * bfqq->entity.budget must contain, + * respectively, the service received and the + * budget used last time bfqq emptied. These + * facts do not hold in this case, as at least + * this last removal occurred while bfqq is + * not in service. To avoid inconsistencies, + * reset both bfqq->entity.service and + * bfqq->entity.budget, if bfqq has still a + * process that may issue I/O requests to it. + */ + bfqq->entity.budget = bfqq->entity.service = 0; + } + + /* + * Remove queue from request-position tree as it is empty. + */ + if (bfqq->pos_root) { + rb_erase(&bfqq->pos_node, bfqq->pos_root); + bfqq->pos_root = NULL; + } + } + + if (rq->cmd_flags & REQ_META) { + BUG_ON(bfqq->meta_pending == 0); + bfqq->meta_pending--; + } + bfqg_stats_update_io_remove(bfqq_group(bfqq), rq->cmd_flags); +} + +static enum elv_merge bfq_merge(struct request_queue *q, struct request **req, + struct bio *bio) +{ + struct bfq_data *bfqd = q->elevator->elevator_data; + struct request *__rq; + + __rq = bfq_find_rq_fmerge(bfqd, bio); + if (__rq && elv_bio_merge_ok(__rq, bio)) { + *req = __rq; + return ELEVATOR_FRONT_MERGE; + } + + return ELEVATOR_NO_MERGE; +} + +static void bfq_merged_request(struct request_queue *q, struct request *req, + enum elv_merge type) +{ + if (type == ELEVATOR_FRONT_MERGE && + rb_prev(&req->rb_node) && + blk_rq_pos(req) < + blk_rq_pos(container_of(rb_prev(&req->rb_node), + struct request, rb_node))) { + struct bfq_queue *bfqq = RQ_BFQQ(req); + struct bfq_data *bfqd = bfqq->bfqd; + struct request *prev, *next_rq; + + /* Reposition request in its sort_list */ + elv_rb_del(&bfqq->sort_list, req); + elv_rb_add(&bfqq->sort_list, req); + /* Choose next request to be served for bfqq */ + prev = bfqq->next_rq; + next_rq = bfq_choose_req(bfqd, bfqq->next_rq, req, + bfqd->last_position); + BUG_ON(!next_rq); + bfqq->next_rq = next_rq; + /* + * If next_rq changes, update both the queue's budget to + * fit the new request and the queue's position in its + * rq_pos_tree. + */ + if (prev != bfqq->next_rq) { + bfq_updated_next_req(bfqd, bfqq); + bfq_pos_tree_add_move(bfqd, bfqq); + } + } +} + +#ifdef BFQ_GROUP_IOSCHED_ENABLED +static void bfq_bio_merged(struct request_queue *q, struct request *req, + struct bio *bio) +{ + bfqg_stats_update_io_merged(bfqq_group(RQ_BFQQ(req)), bio->bi_opf); +} +#endif + +static void bfq_merged_requests(struct request_queue *q, struct request *rq, + struct request *next) +{ + struct bfq_queue *bfqq = RQ_BFQQ(rq), *next_bfqq = RQ_BFQQ(next); + + /* + * If next and rq belong to the same bfq_queue and next is older + * than rq, then reposition rq in the fifo (by substituting next + * with rq). Otherwise, if next and rq belong to different + * bfq_queues, never reposition rq: in fact, we would have to + * reposition it with respect to next's position in its own fifo, + * which would most certainly be too expensive with respect to + * the benefits. + */ + if (bfqq == next_bfqq && + !list_empty(&rq->queuelist) && !list_empty(&next->queuelist) && + next->fifo_time < rq->fifo_time) { + list_del_init(&rq->queuelist); + list_replace_init(&next->queuelist, &rq->queuelist); + rq->fifo_time = next->fifo_time; + } + + if (bfqq->next_rq == next) + bfqq->next_rq = rq; + + bfq_remove_request(next); + bfqg_stats_update_io_merged(bfqq_group(bfqq), next->cmd_flags); +} + +/* Must be called with bfqq != NULL */ +static void bfq_bfqq_end_wr(struct bfq_queue *bfqq) +{ + BUG_ON(!bfqq); + + if (bfq_bfqq_busy(bfqq)) { + bfqq->bfqd->wr_busy_queues--; + BUG_ON(bfqq->bfqd->wr_busy_queues < 0); + } + bfqq->wr_coeff = 1; + bfqq->wr_cur_max_time = 0; + bfqq->last_wr_start_finish = jiffies; + /* + * Trigger a weight change on the next invocation of + * __bfq_entity_update_weight_prio. + */ + bfqq->entity.prio_changed = 1; + bfq_log_bfqq(bfqq->bfqd, bfqq, + "end_wr: wrais ending at %lu, rais_max_time %u", + bfqq->last_wr_start_finish, + jiffies_to_msecs(bfqq->wr_cur_max_time)); + bfq_log_bfqq(bfqq->bfqd, bfqq, "end_wr: wr_busy %d", + bfqq->bfqd->wr_busy_queues); +} + +static void bfq_end_wr_async_queues(struct bfq_data *bfqd, + struct bfq_group *bfqg) +{ + int i, j; + + for (i = 0; i < 2; i++) + for (j = 0; j < IOPRIO_BE_NR; j++) + if (bfqg->async_bfqq[i][j]) + bfq_bfqq_end_wr(bfqg->async_bfqq[i][j]); + if (bfqg->async_idle_bfqq) + bfq_bfqq_end_wr(bfqg->async_idle_bfqq); +} + +static void bfq_end_wr(struct bfq_data *bfqd) +{ + struct bfq_queue *bfqq; + + spin_lock_irq(bfqd->queue->queue_lock); + + list_for_each_entry(bfqq, &bfqd->active_list, bfqq_list) + bfq_bfqq_end_wr(bfqq); + list_for_each_entry(bfqq, &bfqd->idle_list, bfqq_list) + bfq_bfqq_end_wr(bfqq); + bfq_end_wr_async(bfqd); + + spin_unlock_irq(bfqd->queue->queue_lock); +} + +static sector_t bfq_io_struct_pos(void *io_struct, bool request) +{ + if (request) + return blk_rq_pos(io_struct); + else + return ((struct bio *)io_struct)->bi_iter.bi_sector; +} + +static int bfq_rq_close_to_sector(void *io_struct, bool request, + sector_t sector) +{ + return abs(bfq_io_struct_pos(io_struct, request) - sector) <= + BFQQ_CLOSE_THR; +} + +static struct bfq_queue *bfqq_find_close(struct bfq_data *bfqd, + struct bfq_queue *bfqq, + sector_t sector) +{ + struct rb_root *root = &bfq_bfqq_to_bfqg(bfqq)->rq_pos_tree; + struct rb_node *parent, *node; + struct bfq_queue *__bfqq; + + if (RB_EMPTY_ROOT(root)) + return NULL; + + /* + * First, if we find a request starting at the end of the last + * request, choose it. + */ + __bfqq = bfq_rq_pos_tree_lookup(bfqd, root, sector, &parent, NULL); + if (__bfqq) + return __bfqq; + + /* + * If the exact sector wasn't found, the parent of the NULL leaf + * will contain the closest sector (rq_pos_tree sorted by + * next_request position). + */ + __bfqq = rb_entry(parent, struct bfq_queue, pos_node); + if (bfq_rq_close_to_sector(__bfqq->next_rq, true, sector)) + return __bfqq; + + if (blk_rq_pos(__bfqq->next_rq) < sector) + node = rb_next(&__bfqq->pos_node); + else + node = rb_prev(&__bfqq->pos_node); + if (!node) + return NULL; + + __bfqq = rb_entry(node, struct bfq_queue, pos_node); + if (bfq_rq_close_to_sector(__bfqq->next_rq, true, sector)) + return __bfqq; + + return NULL; +} + +static struct bfq_queue *bfq_find_close_cooperator(struct bfq_data *bfqd, + struct bfq_queue *cur_bfqq, + sector_t sector) +{ + struct bfq_queue *bfqq; + + /* + * We shall notice if some of the queues are cooperating, + * e.g., working closely on the same area of the device. In + * that case, we can group them together and: 1) don't waste + * time idling, and 2) serve the union of their requests in + * the best possible order for throughput. + */ + bfqq = bfqq_find_close(bfqd, cur_bfqq, sector); + if (!bfqq || bfqq == cur_bfqq) + return NULL; + + return bfqq; +} + +static struct bfq_queue * +bfq_setup_merge(struct bfq_queue *bfqq, struct bfq_queue *new_bfqq) +{ + int process_refs, new_process_refs; + struct bfq_queue *__bfqq; + + /* + * If there are no process references on the new_bfqq, then it is + * unsafe to follow the ->new_bfqq chain as other bfqq's in the chain + * may have dropped their last reference (not just their last process + * reference). + */ + if (!bfqq_process_refs(new_bfqq)) + return NULL; + + /* Avoid a circular list and skip interim queue merges. */ + while ((__bfqq = new_bfqq->new_bfqq)) { + if (__bfqq == bfqq) + return NULL; + new_bfqq = __bfqq; + } + + process_refs = bfqq_process_refs(bfqq); + new_process_refs = bfqq_process_refs(new_bfqq); + /* + * If the process for the bfqq has gone away, there is no + * sense in merging the queues. + */ + if (process_refs == 0 || new_process_refs == 0) + return NULL; + + bfq_log_bfqq(bfqq->bfqd, bfqq, "scheduling merge with queue %d", + new_bfqq->pid); + + /* + * Merging is just a redirection: the requests of the process + * owning one of the two queues are redirected to the other queue. + * The latter queue, in its turn, is set as shared if this is the + * first time that the requests of some process are redirected to + * it. + * + * We redirect bfqq to new_bfqq and not the opposite, because we + * are in the context of the process owning bfqq, hence we have + * the io_cq of this process. So we can immediately configure this + * io_cq to redirect the requests of the process to new_bfqq. + * + * NOTE, even if new_bfqq coincides with the in-service queue, the + * io_cq of new_bfqq is not available, because, if the in-service + * queue is shared, bfqd->in_service_bic may not point to the + * io_cq of the in-service queue. + * Redirecting the requests of the process owning bfqq to the + * currently in-service queue is in any case the best option, as + * we feed the in-service queue with new requests close to the + * last request served and, by doing so, hopefully increase the + * throughput. + */ + bfqq->new_bfqq = new_bfqq; + new_bfqq->ref += process_refs; + return new_bfqq; +} + +static bool bfq_may_be_close_cooperator(struct bfq_queue *bfqq, + struct bfq_queue *new_bfqq) +{ + if (bfq_class_idle(bfqq) || bfq_class_idle(new_bfqq) || + (bfqq->ioprio_class != new_bfqq->ioprio_class)) + return false; + + /* + * If either of the queues has already been detected as seeky, + * then merging it with the other queue is unlikely to lead to + * sequential I/O. + */ + if (BFQQ_SEEKY(bfqq) || BFQQ_SEEKY(new_bfqq)) + return false; + + /* + * Interleaved I/O is known to be done by (some) applications + * only for reads, so it does not make sense to merge async + * queues. + */ + if (!bfq_bfqq_sync(bfqq) || !bfq_bfqq_sync(new_bfqq)) + return false; + + return true; +} + +/* + * If this function returns true, then bfqq cannot be merged. The idea + * is that true cooperation happens very early after processes start + * to do I/O. Usually, late cooperations are just accidental false + * positives. In case bfqq is weight-raised, such false positives + * would evidently degrade latency guarantees for bfqq. + */ +static bool wr_from_too_long(struct bfq_queue *bfqq) +{ + return bfqq->wr_coeff > 1 && + time_is_before_jiffies(bfqq->last_wr_start_finish + + msecs_to_jiffies(100)); +} + +/* + * Attempt to schedule a merge of bfqq with the currently in-service + * queue or with a close queue among the scheduled queues. Return + * NULL if no merge was scheduled, a pointer to the shared bfq_queue + * structure otherwise. + * + * The OOM queue is not allowed to participate to cooperation: in fact, since + * the requests temporarily redirected to the OOM queue could be redirected + * again to dedicated queues at any time, the state needed to correctly + * handle merging with the OOM queue would be quite complex and expensive + * to maintain. Besides, in such a critical condition as an out of memory, + * the benefits of queue merging may be little relevant, or even negligible. + * + * Weight-raised queues can be merged only if their weight-raising + * period has just started. In fact cooperating processes are usually + * started together. Thus, with this filter we avoid false positives + * that would jeopardize low-latency guarantees. + * + * WARNING: queue merging may impair fairness among non-weight raised + * queues, for at least two reasons: 1) the original weight of a + * merged queue may change during the merged state, 2) even being the + * weight the same, a merged queue may be bloated with many more + * requests than the ones produced by its originally-associated + * process. + */ +static struct bfq_queue * +bfq_setup_cooperator(struct bfq_data *bfqd, struct bfq_queue *bfqq, + void *io_struct, bool request) +{ + struct bfq_queue *in_service_bfqq, *new_bfqq; + + if (bfqq->new_bfqq) + return bfqq->new_bfqq; + + if (io_struct && wr_from_too_long(bfqq) && + likely(bfqq != &bfqd->oom_bfqq)) + bfq_log_bfqq(bfqd, bfqq, + "would have looked for coop, but bfq%d wr", + bfqq->pid); + + if (!io_struct || + wr_from_too_long(bfqq) || + unlikely(bfqq == &bfqd->oom_bfqq)) + return NULL; + + /* If there is only one backlogged queue, don't search. */ + if (bfqd->busy_queues == 1) + return NULL; + + in_service_bfqq = bfqd->in_service_queue; + + if (in_service_bfqq && in_service_bfqq != bfqq && + bfqd->in_service_bic && wr_from_too_long(in_service_bfqq) + && likely(in_service_bfqq == &bfqd->oom_bfqq)) + bfq_log_bfqq(bfqd, bfqq, + "would have tried merge with in-service-queue, but wr"); + + if (!in_service_bfqq || in_service_bfqq == bfqq || + !bfqd->in_service_bic || wr_from_too_long(in_service_bfqq) || + unlikely(in_service_bfqq == &bfqd->oom_bfqq)) + goto check_scheduled; + + if (bfq_rq_close_to_sector(io_struct, request, bfqd->last_position) && + bfqq->entity.parent == in_service_bfqq->entity.parent && + bfq_may_be_close_cooperator(bfqq, in_service_bfqq)) { + new_bfqq = bfq_setup_merge(bfqq, in_service_bfqq); + if (new_bfqq) + return new_bfqq; + } + /* + * Check whether there is a cooperator among currently scheduled + * queues. The only thing we need is that the bio/request is not + * NULL, as we need it to establish whether a cooperator exists. + */ +check_scheduled: + new_bfqq = bfq_find_close_cooperator(bfqd, bfqq, + bfq_io_struct_pos(io_struct, request)); + + BUG_ON(new_bfqq && bfqq->entity.parent != new_bfqq->entity.parent); + + if (new_bfqq && wr_from_too_long(new_bfqq) && + likely(new_bfqq != &bfqd->oom_bfqq) && + bfq_may_be_close_cooperator(bfqq, new_bfqq)) + bfq_log_bfqq(bfqd, bfqq, + "would have merged with bfq%d, but wr", + new_bfqq->pid); + + if (new_bfqq && !wr_from_too_long(new_bfqq) && + likely(new_bfqq != &bfqd->oom_bfqq) && + bfq_may_be_close_cooperator(bfqq, new_bfqq)) + return bfq_setup_merge(bfqq, new_bfqq); + + return NULL; +} + +static void bfq_bfqq_save_state(struct bfq_queue *bfqq) +{ + struct bfq_io_cq *bic = bfqq->bic; + + /* + * If !bfqq->bic, the queue is already shared or its requests + * have already been redirected to a shared queue; both idle window + * and weight raising state have already been saved. Do nothing. + */ + if (!bic) + return; + + bic->saved_has_short_ttime = bfq_bfqq_has_short_ttime(bfqq); + bic->saved_IO_bound = bfq_bfqq_IO_bound(bfqq); + bic->saved_in_large_burst = bfq_bfqq_in_large_burst(bfqq); + bic->was_in_burst_list = !hlist_unhashed(&bfqq->burst_list_node); + bic->saved_wr_coeff = bfqq->wr_coeff; + bic->saved_wr_start_at_switch_to_srt = bfqq->wr_start_at_switch_to_srt; + bic->saved_last_wr_start_finish = bfqq->last_wr_start_finish; + bic->saved_wr_cur_max_time = bfqq->wr_cur_max_time; + BUG_ON(time_is_after_jiffies(bfqq->last_wr_start_finish)); +} + +static void bfq_get_bic_reference(struct bfq_queue *bfqq) +{ + /* + * If bfqq->bic has a non-NULL value, the bic to which it belongs + * is about to begin using a shared bfq_queue. + */ + if (bfqq->bic) + atomic_long_inc(&bfqq->bic->icq.ioc->refcount); +} + +static void +bfq_merge_bfqqs(struct bfq_data *bfqd, struct bfq_io_cq *bic, + struct bfq_queue *bfqq, struct bfq_queue *new_bfqq) +{ + bfq_log_bfqq(bfqd, bfqq, "merging with queue %lu", + (unsigned long) new_bfqq->pid); + /* Save weight raising and idle window of the merged queues */ + bfq_bfqq_save_state(bfqq); + bfq_bfqq_save_state(new_bfqq); + if (bfq_bfqq_IO_bound(bfqq)) + bfq_mark_bfqq_IO_bound(new_bfqq); + bfq_clear_bfqq_IO_bound(bfqq); + + /* + * If bfqq is weight-raised, then let new_bfqq inherit + * weight-raising. To reduce false positives, neglect the case + * where bfqq has just been created, but has not yet made it + * to be weight-raised (which may happen because EQM may merge + * bfqq even before bfq_add_request is executed for the first + * time for bfqq). Handling this case would however be very + * easy, thanks to the flag just_created. + */ + if (new_bfqq->wr_coeff == 1 && bfqq->wr_coeff > 1) { + new_bfqq->wr_coeff = bfqq->wr_coeff; + new_bfqq->wr_cur_max_time = bfqq->wr_cur_max_time; + new_bfqq->last_wr_start_finish = bfqq->last_wr_start_finish; + new_bfqq->wr_start_at_switch_to_srt = + bfqq->wr_start_at_switch_to_srt; + if (bfq_bfqq_busy(new_bfqq)) { + bfqd->wr_busy_queues++; + BUG_ON(bfqd->wr_busy_queues > bfqd->busy_queues); + } + + new_bfqq->entity.prio_changed = 1; + bfq_log_bfqq(bfqd, new_bfqq, + "wr start after merge with %d, rais_max_time %u", + bfqq->pid, + jiffies_to_msecs(bfqq->wr_cur_max_time)); + } + + if (bfqq->wr_coeff > 1) { /* bfqq has given its wr to new_bfqq */ + bfqq->wr_coeff = 1; + bfqq->entity.prio_changed = 1; + if (bfq_bfqq_busy(bfqq)) { + bfqd->wr_busy_queues--; + BUG_ON(bfqd->wr_busy_queues < 0); + } + + } + + bfq_log_bfqq(bfqd, new_bfqq, "merge_bfqqs: wr_busy %d", + bfqd->wr_busy_queues); + + /* + * Grab a reference to the bic, to prevent it from being destroyed + * before being possibly touched by a bfq_split_bfqq(). + */ + bfq_get_bic_reference(bfqq); + bfq_get_bic_reference(new_bfqq); + /* + * Merge queues (that is, let bic redirect its requests to new_bfqq) + */ + bic_set_bfqq(bic, new_bfqq, 1); + bfq_mark_bfqq_coop(new_bfqq); + /* + * new_bfqq now belongs to at least two bics (it is a shared queue): + * set new_bfqq->bic to NULL. bfqq either: + * - does not belong to any bic any more, and hence bfqq->bic must + * be set to NULL, or + * - is a queue whose owning bics have already been redirected to a + * different queue, hence the queue is destined to not belong to + * any bic soon and bfqq->bic is already NULL (therefore the next + * assignment causes no harm). + */ + new_bfqq->bic = NULL; + bfqq->bic = NULL; + /* release process reference to bfqq */ + bfq_put_queue(bfqq); +} + +static int bfq_allow_bio_merge(struct request_queue *q, struct request *rq, + struct bio *bio) +{ + struct bfq_data *bfqd = q->elevator->elevator_data; + bool is_sync = op_is_sync(bio->bi_opf); + struct bfq_io_cq *bic; + struct bfq_queue *bfqq, *new_bfqq; + + /* + * Disallow merge of a sync bio into an async request. + */ + if (is_sync && !rq_is_sync(rq)) + return false; + + /* + * Lookup the bfqq that this bio will be queued with. Allow + * merge only if rq is queued there. + * Queue lock is held here. + */ + bic = bfq_bic_lookup(bfqd, current->io_context); + if (!bic) + return false; + + bfqq = bic_to_bfqq(bic, is_sync); + /* + * We take advantage of this function to perform an early merge + * of the queues of possible cooperating processes. + */ + if (bfqq) { + new_bfqq = bfq_setup_cooperator(bfqd, bfqq, bio, false); + if (new_bfqq) { + bfq_merge_bfqqs(bfqd, bic, bfqq, new_bfqq); + /* + * If we get here, the bio will be queued in the + * shared queue, i.e., new_bfqq, so use new_bfqq + * to decide whether bio and rq can be merged. + */ + bfqq = new_bfqq; + } + } + + return bfqq == RQ_BFQQ(rq); +} + +static int bfq_allow_rq_merge(struct request_queue *q, struct request *rq, + struct request *next) +{ + return RQ_BFQQ(rq) == RQ_BFQQ(next); +} + +/* + * Set the maximum time for the in-service queue to consume its + * budget. This prevents seeky processes from lowering the throughput. + * In practice, a time-slice service scheme is used with seeky + * processes. + */ +static void bfq_set_budget_timeout(struct bfq_data *bfqd, + struct bfq_queue *bfqq) +{ + unsigned int timeout_coeff; + + if (bfqq->wr_cur_max_time == bfqd->bfq_wr_rt_max_time) + timeout_coeff = 1; + else + timeout_coeff = bfqq->entity.weight / bfqq->entity.orig_weight; + + bfqd->last_budget_start = ktime_get(); + + bfqq->budget_timeout = jiffies + + bfqd->bfq_timeout * timeout_coeff; + + bfq_log_bfqq(bfqd, bfqq, "set budget_timeout %u", + jiffies_to_msecs(bfqd->bfq_timeout * timeout_coeff)); +} + +static void __bfq_set_in_service_queue(struct bfq_data *bfqd, + struct bfq_queue *bfqq) +{ + if (bfqq) { + bfqg_stats_update_avg_queue_size(bfqq_group(bfqq)); + bfq_mark_bfqq_must_alloc(bfqq); + bfq_clear_bfqq_fifo_expire(bfqq); + + bfqd->budgets_assigned = (bfqd->budgets_assigned*7 + 256) / 8; + + BUG_ON(bfqq == bfqd->in_service_queue); + BUG_ON(RB_EMPTY_ROOT(&bfqq->sort_list)); + + if (time_is_before_jiffies(bfqq->last_wr_start_finish) && + bfqq->wr_coeff > 1 && + bfqq->wr_cur_max_time == bfqd->bfq_wr_rt_max_time && + time_is_before_jiffies(bfqq->budget_timeout)) { + /* + * For soft real-time queues, move the start + * of the weight-raising period forward by the + * time the queue has not received any + * service. Otherwise, a relatively long + * service delay is likely to cause the + * weight-raising period of the queue to end, + * because of the short duration of the + * weight-raising period of a soft real-time + * queue. It is worth noting that this move + * is not so dangerous for the other queues, + * because soft real-time queues are not + * greedy. + * + * To not add a further variable, we use the + * overloaded field budget_timeout to + * determine for how long the queue has not + * received service, i.e., how much time has + * elapsed since the queue expired. However, + * this is a little imprecise, because + * budget_timeout is set to jiffies if bfqq + * not only expires, but also remains with no + * request. + */ + if (time_after(bfqq->budget_timeout, + bfqq->last_wr_start_finish)) + bfqq->last_wr_start_finish += + jiffies - bfqq->budget_timeout; + else + bfqq->last_wr_start_finish = jiffies; + + if (time_is_after_jiffies(bfqq->last_wr_start_finish)) { + pr_crit( + "BFQ WARNING:last %lu budget %lu jiffies %lu", + bfqq->last_wr_start_finish, + bfqq->budget_timeout, + jiffies); + pr_crit("diff %lu", jiffies - + max_t(unsigned long, + bfqq->last_wr_start_finish, + bfqq->budget_timeout)); + bfqq->last_wr_start_finish = jiffies; + } + } + + bfq_set_budget_timeout(bfqd, bfqq); + bfq_log_bfqq(bfqd, bfqq, + "set_in_service_queue, cur-budget = %d", + bfqq->entity.budget); + } else + bfq_log(bfqd, "set_in_service_queue: NULL"); + + bfqd->in_service_queue = bfqq; +} + +/* + * Get and set a new queue for service. + */ +static struct bfq_queue *bfq_set_in_service_queue(struct bfq_data *bfqd) +{ + struct bfq_queue *bfqq = bfq_get_next_queue(bfqd); + + __bfq_set_in_service_queue(bfqd, bfqq); + return bfqq; +} + +static void bfq_arm_slice_timer(struct bfq_data *bfqd) +{ + struct bfq_queue *bfqq = bfqd->in_service_queue; + struct bfq_io_cq *bic; + u32 sl; + + BUG_ON(!RB_EMPTY_ROOT(&bfqq->sort_list)); + + /* Processes have exited, don't wait. */ + bic = bfqd->in_service_bic; + if (!bic || atomic_read(&bic->icq.ioc->active_ref) == 0) + return; + + bfq_mark_bfqq_wait_request(bfqq); + + /* + * We don't want to idle for seeks, but we do want to allow + * fair distribution of slice time for a process doing back-to-back + * seeks. So allow a little bit of time for him to submit a new rq. + * + * To prevent processes with (partly) seeky workloads from + * being too ill-treated, grant them a small fraction of the + * assigned budget before reducing the waiting time to + * BFQ_MIN_TT. This happened to help reduce latency. + */ + sl = bfqd->bfq_slice_idle; + /* + * Unless the queue is being weight-raised or the scenario is + * asymmetric, grant only minimum idle time if the queue + * is seeky. A long idling is preserved for a weight-raised + * queue, or, more in general, in an asymemtric scenario, + * because a long idling is needed for guaranteeing to a queue + * its reserved share of the throughput (in particular, it is + * needed if the queue has a higher weight than some other + * queue). + */ + if (BFQQ_SEEKY(bfqq) && bfqq->wr_coeff == 1 && + bfq_symmetric_scenario(bfqd)) + sl = min_t(u32, sl, BFQ_MIN_TT); + + bfqd->last_idling_start = ktime_get(); + hrtimer_start(&bfqd->idle_slice_timer, ns_to_ktime(sl), + HRTIMER_MODE_REL); + bfqg_stats_set_start_idle_time(bfqq_group(bfqq)); + bfq_log(bfqd, "arm idle: %ld/%ld ms", + sl / NSEC_PER_MSEC, bfqd->bfq_slice_idle / NSEC_PER_MSEC); +} + +/* + * In autotuning mode, max_budget is dynamically recomputed as the + * amount of sectors transferred in timeout at the estimated peak + * rate. This enables BFQ to utilize a full timeslice with a full + * budget, even if the in-service queue is served at peak rate. And + * this maximises throughput with sequential workloads. + */ +static unsigned long bfq_calc_max_budget(struct bfq_data *bfqd) +{ + return (u64)bfqd->peak_rate * USEC_PER_MSEC * + jiffies_to_msecs(bfqd->bfq_timeout)>>BFQ_RATE_SHIFT; +} + +/* + * Update parameters related to throughput and responsiveness, as a + * function of the estimated peak rate. See comments on + * bfq_calc_max_budget(), and on T_slow and T_fast arrays. + */ +static void update_thr_responsiveness_params(struct bfq_data *bfqd) +{ + int dev_type = blk_queue_nonrot(bfqd->queue); + + if (bfqd->bfq_user_max_budget == 0) { + bfqd->bfq_max_budget = + bfq_calc_max_budget(bfqd); + BUG_ON(bfqd->bfq_max_budget < 0); + bfq_log(bfqd, "new max_budget = %d", + bfqd->bfq_max_budget); + } + + if (bfqd->device_speed == BFQ_BFQD_FAST && + bfqd->peak_rate < device_speed_thresh[dev_type]) { + bfqd->device_speed = BFQ_BFQD_SLOW; + bfqd->RT_prod = R_slow[dev_type] * + T_slow[dev_type]; + } else if (bfqd->device_speed == BFQ_BFQD_SLOW && + bfqd->peak_rate > device_speed_thresh[dev_type]) { + bfqd->device_speed = BFQ_BFQD_FAST; + bfqd->RT_prod = R_fast[dev_type] * + T_fast[dev_type]; + } + + bfq_log(bfqd, +"dev_type %s dev_speed_class = %s (%llu sects/sec), thresh %llu setcs/sec", + dev_type == 0 ? "ROT" : "NONROT", + bfqd->device_speed == BFQ_BFQD_FAST ? "FAST" : "SLOW", + bfqd->device_speed == BFQ_BFQD_FAST ? + (USEC_PER_SEC*(u64)R_fast[dev_type])>>BFQ_RATE_SHIFT : + (USEC_PER_SEC*(u64)R_slow[dev_type])>>BFQ_RATE_SHIFT, + (USEC_PER_SEC*(u64)device_speed_thresh[dev_type])>> + BFQ_RATE_SHIFT); +} + +static void bfq_reset_rate_computation(struct bfq_data *bfqd, struct request *rq) +{ + if (rq != NULL) { /* new rq dispatch now, reset accordingly */ + bfqd->last_dispatch = bfqd->first_dispatch = ktime_get_ns() ; + bfqd->peak_rate_samples = 1; + bfqd->sequential_samples = 0; + bfqd->tot_sectors_dispatched = bfqd->last_rq_max_size = + blk_rq_sectors(rq); + } else /* no new rq dispatched, just reset the number of samples */ + bfqd->peak_rate_samples = 0; /* full re-init on next disp. */ + + bfq_log(bfqd, + "reset_rate_computation at end, sample %u/%u tot_sects %llu", + bfqd->peak_rate_samples, bfqd->sequential_samples, + bfqd->tot_sectors_dispatched); +} + +static void bfq_update_rate_reset(struct bfq_data *bfqd, struct request *rq) +{ + u32 rate, weight, divisor; + + /* + * For the convergence property to hold (see comments on + * bfq_update_peak_rate()) and for the assessment to be + * reliable, a minimum number of samples must be present, and + * a minimum amount of time must have elapsed. If not so, do + * not compute new rate. Just reset parameters, to get ready + * for a new evaluation attempt. + */ + if (bfqd->peak_rate_samples < BFQ_RATE_MIN_SAMPLES || + bfqd->delta_from_first < BFQ_RATE_MIN_INTERVAL) { + bfq_log(bfqd, + "update_rate_reset: only resetting, delta_first %lluus samples %d", + bfqd->delta_from_first>>10, bfqd->peak_rate_samples); + goto reset_computation; + } + + /* + * If a new request completion has occurred after last + * dispatch, then, to approximate the rate at which requests + * have been served by the device, it is more precise to + * extend the observation interval to the last completion. + */ + bfqd->delta_from_first = + max_t(u64, bfqd->delta_from_first, + bfqd->last_completion - bfqd->first_dispatch); + + BUG_ON(bfqd->delta_from_first == 0); + /* + * Rate computed in sects/usec, and not sects/nsec, for + * precision issues. + */ + rate = div64_ul(bfqd->tot_sectors_dispatched<delta_from_first, NSEC_PER_USEC)); + + bfq_log(bfqd, +"update_rate_reset: tot_sects %llu delta_first %lluus rate %llu sects/s (%d)", + bfqd->tot_sectors_dispatched, bfqd->delta_from_first>>10, + ((USEC_PER_SEC*(u64)rate)>>BFQ_RATE_SHIFT), + rate > 20< 20M sectors/sec) + */ + if ((bfqd->sequential_samples < (3 * bfqd->peak_rate_samples)>>2 && + rate <= bfqd->peak_rate) || + rate > 20<peak_rate_samples, bfqd->sequential_samples, + ((USEC_PER_SEC*(u64)rate)>>BFQ_RATE_SHIFT), + ((USEC_PER_SEC*(u64)bfqd->peak_rate)>>BFQ_RATE_SHIFT)); + goto reset_computation; + } else { + bfq_log(bfqd, + "update_rate_reset: do update, samples %u/%u rate/peak %llu/%llu", + bfqd->peak_rate_samples, bfqd->sequential_samples, + ((USEC_PER_SEC*(u64)rate)>>BFQ_RATE_SHIFT), + ((USEC_PER_SEC*(u64)bfqd->peak_rate)>>BFQ_RATE_SHIFT)); + } + + /* + * We have to update the peak rate, at last! To this purpose, + * we use a low-pass filter. We compute the smoothing constant + * of the filter as a function of the 'weight' of the new + * measured rate. + * + * As can be seen in next formulas, we define this weight as a + * quantity proportional to how sequential the workload is, + * and to how long the observation time interval is. + * + * The weight runs from 0 to 8. The maximum value of the + * weight, 8, yields the minimum value for the smoothing + * constant. At this minimum value for the smoothing constant, + * the measured rate contributes for half of the next value of + * the estimated peak rate. + * + * So, the first step is to compute the weight as a function + * of how sequential the workload is. Note that the weight + * cannot reach 9, because bfqd->sequential_samples cannot + * become equal to bfqd->peak_rate_samples, which, in its + * turn, holds true because bfqd->sequential_samples is not + * incremented for the first sample. + */ + weight = (9 * bfqd->sequential_samples) / bfqd->peak_rate_samples; + + /* + * Second step: further refine the weight as a function of the + * duration of the observation interval. + */ + weight = min_t(u32, 8, + div_u64(weight * bfqd->delta_from_first, + BFQ_RATE_REF_INTERVAL)); + + /* + * Divisor ranging from 10, for minimum weight, to 2, for + * maximum weight. + */ + divisor = 10 - weight; + BUG_ON(divisor == 0); + + /* + * Finally, update peak rate: + * + * peak_rate = peak_rate * (divisor-1) / divisor + rate / divisor + */ + bfqd->peak_rate *= divisor-1; + bfqd->peak_rate /= divisor; + rate /= divisor; /* smoothing constant alpha = 1/divisor */ + + bfq_log(bfqd, + "update_rate_reset: divisor %d tmp_peak_rate %llu tmp_rate %u", + divisor, + ((USEC_PER_SEC*(u64)bfqd->peak_rate)>>BFQ_RATE_SHIFT), + (u32)((USEC_PER_SEC*(u64)rate)>>BFQ_RATE_SHIFT)); + + BUG_ON(bfqd->peak_rate == 0); + BUG_ON(bfqd->peak_rate > 20<peak_rate += rate; + update_thr_responsiveness_params(bfqd); + BUG_ON(bfqd->peak_rate > 20<peak_rate_samples == 0) { /* first dispatch */ + bfq_log(bfqd, + "update_peak_rate: goto reset, samples %d", + bfqd->peak_rate_samples) ; + bfq_reset_rate_computation(bfqd, rq); + goto update_last_values; /* will add one sample */ + } + + /* + * Device idle for very long: the observation interval lasting + * up to this dispatch cannot be a valid observation interval + * for computing a new peak rate (similarly to the late- + * completion event in bfq_completed_request()). Go to + * update_rate_and_reset to have the following three steps + * taken: + * - close the observation interval at the last (previous) + * request dispatch or completion + * - compute rate, if possible, for that observation interval + * - start a new observation interval with this dispatch + */ + if (now_ns - bfqd->last_dispatch > 100*NSEC_PER_MSEC && + bfqd->rq_in_driver == 0) { + bfq_log(bfqd, +"update_peak_rate: jumping to updating&resetting delta_last %lluus samples %d", + (now_ns - bfqd->last_dispatch)>>10, + bfqd->peak_rate_samples) ; + goto update_rate_and_reset; + } + + /* Update sampling information */ + bfqd->peak_rate_samples++; + + if ((bfqd->rq_in_driver > 0 || + now_ns - bfqd->last_completion < BFQ_MIN_TT) + && get_sdist(bfqd->last_position, rq) < BFQQ_SEEK_THR) + bfqd->sequential_samples++; + + bfqd->tot_sectors_dispatched += blk_rq_sectors(rq); + + /* Reset max observed rq size every 32 dispatches */ + if (likely(bfqd->peak_rate_samples % 32)) + bfqd->last_rq_max_size = + max_t(u32, blk_rq_sectors(rq), bfqd->last_rq_max_size); + else + bfqd->last_rq_max_size = blk_rq_sectors(rq); + + bfqd->delta_from_first = now_ns - bfqd->first_dispatch; + + bfq_log(bfqd, + "update_peak_rate: added samples %u/%u tot_sects %llu delta_first %lluus", + bfqd->peak_rate_samples, bfqd->sequential_samples, + bfqd->tot_sectors_dispatched, + bfqd->delta_from_first>>10); + + /* Target observation interval not yet reached, go on sampling */ + if (bfqd->delta_from_first < BFQ_RATE_REF_INTERVAL) + goto update_last_values; + +update_rate_and_reset: + bfq_update_rate_reset(bfqd, rq); +update_last_values: + bfqd->last_position = blk_rq_pos(rq) + blk_rq_sectors(rq); + bfqd->last_dispatch = now_ns; + + bfq_log(bfqd, + "update_peak_rate: delta_first %lluus last_pos %llu peak_rate %llu", + (now_ns - bfqd->first_dispatch)>>10, + (unsigned long long) bfqd->last_position, + ((USEC_PER_SEC*(u64)bfqd->peak_rate)>>BFQ_RATE_SHIFT)); + bfq_log(bfqd, + "update_peak_rate: samples at end %d", bfqd->peak_rate_samples); +} + +/* + * Move request from internal lists to the dispatch list of the request queue + */ +static void bfq_dispatch_insert(struct request_queue *q, struct request *rq) +{ + struct bfq_queue *bfqq = RQ_BFQQ(rq); + + /* + * For consistency, the next instruction should have been executed + * after removing the request from the queue and dispatching it. + * We execute instead this instruction before bfq_remove_request() + * (and hence introduce a temporary inconsistency), for efficiency. + * In fact, in a forced_dispatch, this prevents two counters related + * to bfqq->dispatched to risk to be uselessly decremented if bfqq + * is not in service, and then to be incremented again after + * incrementing bfqq->dispatched. + */ + bfqq->dispatched++; + bfq_update_peak_rate(q->elevator->elevator_data, rq); + + bfq_remove_request(rq); + elv_dispatch_sort(q, rq); +} + +static void __bfq_bfqq_expire(struct bfq_data *bfqd, struct bfq_queue *bfqq) +{ + BUG_ON(bfqq != bfqd->in_service_queue); + + /* + * If this bfqq is shared between multiple processes, check + * to make sure that those processes are still issuing I/Os + * within the mean seek distance. If not, it may be time to + * break the queues apart again. + */ + if (bfq_bfqq_coop(bfqq) && BFQQ_SEEKY(bfqq)) + bfq_mark_bfqq_split_coop(bfqq); + + if (RB_EMPTY_ROOT(&bfqq->sort_list)) { + if (bfqq->dispatched == 0) + /* + * Overloading budget_timeout field to store + * the time at which the queue remains with no + * backlog and no outstanding request; used by + * the weight-raising mechanism. + */ + bfqq->budget_timeout = jiffies; + + bfq_del_bfqq_busy(bfqd, bfqq, true); + } else { + bfq_requeue_bfqq(bfqd, bfqq, true); + /* + * Resort priority tree of potential close cooperators. + */ + bfq_pos_tree_add_move(bfqd, bfqq); + } + + /* + * All in-service entities must have been properly deactivated + * or requeued before executing the next function, which + * resets all in-service entites as no more in service. + */ + __bfq_bfqd_reset_in_service(bfqd); +} + +/** + * __bfq_bfqq_recalc_budget - try to adapt the budget to the @bfqq behavior. + * @bfqd: device data. + * @bfqq: queue to update. + * @reason: reason for expiration. + * + * Handle the feedback on @bfqq budget at queue expiration. + * See the body for detailed comments. + */ +static void __bfq_bfqq_recalc_budget(struct bfq_data *bfqd, + struct bfq_queue *bfqq, + enum bfqq_expiration reason) +{ + struct request *next_rq; + int budget, min_budget; + + BUG_ON(bfqq != bfqd->in_service_queue); + + min_budget = bfq_min_budget(bfqd); + + if (bfqq->wr_coeff == 1) + budget = bfqq->max_budget; + else /* + * Use a constant, low budget for weight-raised queues, + * to help achieve a low latency. Keep it slightly higher + * than the minimum possible budget, to cause a little + * bit fewer expirations. + */ + budget = 2 * min_budget; + + bfq_log_bfqq(bfqd, bfqq, "recalc_budg: last budg %d, budg left %d", + bfqq->entity.budget, bfq_bfqq_budget_left(bfqq)); + bfq_log_bfqq(bfqd, bfqq, "recalc_budg: last max_budg %d, min budg %d", + budget, bfq_min_budget(bfqd)); + bfq_log_bfqq(bfqd, bfqq, "recalc_budg: sync %d, seeky %d", + bfq_bfqq_sync(bfqq), BFQQ_SEEKY(bfqd->in_service_queue)); + + if (bfq_bfqq_sync(bfqq) && bfqq->wr_coeff == 1) { + switch (reason) { + /* + * Caveat: in all the following cases we trade latency + * for throughput. + */ + case BFQ_BFQQ_TOO_IDLE: + /* + * This is the only case where we may reduce + * the budget: if there is no request of the + * process still waiting for completion, then + * we assume (tentatively) that the timer has + * expired because the batch of requests of + * the process could have been served with a + * smaller budget. Hence, betting that + * process will behave in the same way when it + * becomes backlogged again, we reduce its + * next budget. As long as we guess right, + * this budget cut reduces the latency + * experienced by the process. + * + * However, if there are still outstanding + * requests, then the process may have not yet + * issued its next request just because it is + * still waiting for the completion of some of + * the still outstanding ones. So in this + * subcase we do not reduce its budget, on the + * contrary we increase it to possibly boost + * the throughput, as discussed in the + * comments to the BUDGET_TIMEOUT case. + */ + if (bfqq->dispatched > 0) /* still outstanding reqs */ + budget = min(budget * 2, bfqd->bfq_max_budget); + else { + if (budget > 5 * min_budget) + budget -= 4 * min_budget; + else + budget = min_budget; + } + break; + case BFQ_BFQQ_BUDGET_TIMEOUT: + /* + * We double the budget here because it gives + * the chance to boost the throughput if this + * is not a seeky process (and has bumped into + * this timeout because of, e.g., ZBR). + */ + budget = min(budget * 2, bfqd->bfq_max_budget); + break; + case BFQ_BFQQ_BUDGET_EXHAUSTED: + /* + * The process still has backlog, and did not + * let either the budget timeout or the disk + * idling timeout expire. Hence it is not + * seeky, has a short thinktime and may be + * happy with a higher budget too. So + * definitely increase the budget of this good + * candidate to boost the disk throughput. + */ + budget = min(budget * 4, bfqd->bfq_max_budget); + break; + case BFQ_BFQQ_NO_MORE_REQUESTS: + /* + * For queues that expire for this reason, it + * is particularly important to keep the + * budget close to the actual service they + * need. Doing so reduces the timestamp + * misalignment problem described in the + * comments in the body of + * __bfq_activate_entity. In fact, suppose + * that a queue systematically expires for + * BFQ_BFQQ_NO_MORE_REQUESTS and presents a + * new request in time to enjoy timestamp + * back-shifting. The larger the budget of the + * queue is with respect to the service the + * queue actually requests in each service + * slot, the more times the queue can be + * reactivated with the same virtual finish + * time. It follows that, even if this finish + * time is pushed to the system virtual time + * to reduce the consequent timestamp + * misalignment, the queue unjustly enjoys for + * many re-activations a lower finish time + * than all newly activated queues. + * + * The service needed by bfqq is measured + * quite precisely by bfqq->entity.service. + * Since bfqq does not enjoy device idling, + * bfqq->entity.service is equal to the number + * of sectors that the process associated with + * bfqq requested to read/write before waiting + * for request completions, or blocking for + * other reasons. + */ + budget = max_t(int, bfqq->entity.service, min_budget); + break; + default: + return; + } + } else if (!bfq_bfqq_sync(bfqq)) + /* + * Async queues get always the maximum possible + * budget, as for them we do not care about latency + * (in addition, their ability to dispatch is limited + * by the charging factor). + */ + budget = bfqd->bfq_max_budget; + + bfqq->max_budget = budget; + + if (bfqd->budgets_assigned >= bfq_stats_min_budgets && + !bfqd->bfq_user_max_budget) + bfqq->max_budget = min(bfqq->max_budget, bfqd->bfq_max_budget); + + /* + * If there is still backlog, then assign a new budget, making + * sure that it is large enough for the next request. Since + * the finish time of bfqq must be kept in sync with the + * budget, be sure to call __bfq_bfqq_expire() *after* this + * update. + * + * If there is no backlog, then no need to update the budget; + * it will be updated on the arrival of a new request. + */ + next_rq = bfqq->next_rq; + if (next_rq) { + BUG_ON(reason == BFQ_BFQQ_TOO_IDLE || + reason == BFQ_BFQQ_NO_MORE_REQUESTS); + bfqq->entity.budget = max_t(unsigned long, bfqq->max_budget, + bfq_serv_to_charge(next_rq, bfqq)); + BUG_ON(!bfq_bfqq_busy(bfqq)); + BUG_ON(RB_EMPTY_ROOT(&bfqq->sort_list)); + } + + bfq_log_bfqq(bfqd, bfqq, "head sect: %u, new budget %d", + next_rq ? blk_rq_sectors(next_rq) : 0, + bfqq->entity.budget); +} + +/* + * Return true if the process associated with bfqq is "slow". The slow + * flag is used, in addition to the budget timeout, to reduce the + * amount of service provided to seeky processes, and thus reduce + * their chances to lower the throughput. More details in the comments + * on the function bfq_bfqq_expire(). + * + * An important observation is in order: as discussed in the comments + * on the function bfq_update_peak_rate(), with devices with internal + * queues, it is hard if ever possible to know when and for how long + * an I/O request is processed by the device (apart from the trivial + * I/O pattern where a new request is dispatched only after the + * previous one has been completed). This makes it hard to evaluate + * the real rate at which the I/O requests of each bfq_queue are + * served. In fact, for an I/O scheduler like BFQ, serving a + * bfq_queue means just dispatching its requests during its service + * slot (i.e., until the budget of the queue is exhausted, or the + * queue remains idle, or, finally, a timeout fires). But, during the + * service slot of a bfq_queue, around 100 ms at most, the device may + * be even still processing requests of bfq_queues served in previous + * service slots. On the opposite end, the requests of the in-service + * bfq_queue may be completed after the service slot of the queue + * finishes. + * + * Anyway, unless more sophisticated solutions are used + * (where possible), the sum of the sizes of the requests dispatched + * during the service slot of a bfq_queue is probably the only + * approximation available for the service received by the bfq_queue + * during its service slot. And this sum is the quantity used in this + * function to evaluate the I/O speed of a process. + */ +static bool bfq_bfqq_is_slow(struct bfq_data *bfqd, struct bfq_queue *bfqq, + bool compensate, enum bfqq_expiration reason, + unsigned long *delta_ms) +{ + ktime_t delta_ktime; + u32 delta_usecs; + bool slow = BFQQ_SEEKY(bfqq); /* if delta too short, use seekyness */ + + if (!bfq_bfqq_sync(bfqq)) + return false; + + if (compensate) + delta_ktime = bfqd->last_idling_start; + else + delta_ktime = ktime_get(); + delta_ktime = ktime_sub(delta_ktime, bfqd->last_budget_start); + delta_usecs = ktime_to_us(delta_ktime); + + /* don't use too short time intervals */ + if (delta_usecs < 1000) { + if (blk_queue_nonrot(bfqd->queue)) + /* + * give same worst-case guarantees as idling + * for seeky + */ + *delta_ms = BFQ_MIN_TT / NSEC_PER_MSEC; + else /* charge at least one seek */ + *delta_ms = bfq_slice_idle / NSEC_PER_MSEC; + + bfq_log(bfqd, "bfq_bfqq_is_slow: too short %u", delta_usecs); + + return slow; + } + + *delta_ms = delta_usecs / USEC_PER_MSEC; + + /* + * Use only long (> 20ms) intervals to filter out excessive + * spikes in service rate estimation. + */ + if (delta_usecs > 20000) { + /* + * Caveat for rotational devices: processes doing I/O + * in the slower disk zones tend to be slow(er) even + * if not seeky. In this respect, the estimated peak + * rate is likely to be an average over the disk + * surface. Accordingly, to not be too harsh with + * unlucky processes, a process is deemed slow only if + * its rate has been lower than half of the estimated + * peak rate. + */ + slow = bfqq->entity.service < bfqd->bfq_max_budget / 2; + bfq_log(bfqd, "bfq_bfqq_is_slow: relative rate %d/%d", + bfqq->entity.service, bfqd->bfq_max_budget); + } + + bfq_log_bfqq(bfqd, bfqq, "bfq_bfqq_is_slow: slow %d", slow); + + return slow; +} + +/* + * To be deemed as soft real-time, an application must meet two + * requirements. First, the application must not require an average + * bandwidth higher than the approximate bandwidth required to playback or + * record a compressed high-definition video. + * The next function is invoked on the completion of the last request of a + * batch, to compute the next-start time instant, soft_rt_next_start, such + * that, if the next request of the application does not arrive before + * soft_rt_next_start, then the above requirement on the bandwidth is met. + * + * The second requirement is that the request pattern of the application is + * isochronous, i.e., that, after issuing a request or a batch of requests, + * the application stops issuing new requests until all its pending requests + * have been completed. After that, the application may issue a new batch, + * and so on. + * For this reason the next function is invoked to compute + * soft_rt_next_start only for applications that meet this requirement, + * whereas soft_rt_next_start is set to infinity for applications that do + * not. + * + * Unfortunately, even a greedy application may happen to behave in an + * isochronous way if the CPU load is high. In fact, the application may + * stop issuing requests while the CPUs are busy serving other processes, + * then restart, then stop again for a while, and so on. In addition, if + * the disk achieves a low enough throughput with the request pattern + * issued by the application (e.g., because the request pattern is random + * and/or the device is slow), then the application may meet the above + * bandwidth requirement too. To prevent such a greedy application to be + * deemed as soft real-time, a further rule is used in the computation of + * soft_rt_next_start: soft_rt_next_start must be higher than the current + * time plus the maximum time for which the arrival of a request is waited + * for when a sync queue becomes idle, namely bfqd->bfq_slice_idle. + * This filters out greedy applications, as the latter issue instead their + * next request as soon as possible after the last one has been completed + * (in contrast, when a batch of requests is completed, a soft real-time + * application spends some time processing data). + * + * Unfortunately, the last filter may easily generate false positives if + * only bfqd->bfq_slice_idle is used as a reference time interval and one + * or both the following cases occur: + * 1) HZ is so low that the duration of a jiffy is comparable to or higher + * than bfqd->bfq_slice_idle. This happens, e.g., on slow devices with + * HZ=100. + * 2) jiffies, instead of increasing at a constant rate, may stop increasing + * for a while, then suddenly 'jump' by several units to recover the lost + * increments. This seems to happen, e.g., inside virtual machines. + * To address this issue, we do not use as a reference time interval just + * bfqd->bfq_slice_idle, but bfqd->bfq_slice_idle plus a few jiffies. In + * particular we add the minimum number of jiffies for which the filter + * seems to be quite precise also in embedded systems and KVM/QEMU virtual + * machines. + */ +static unsigned long bfq_bfqq_softrt_next_start(struct bfq_data *bfqd, + struct bfq_queue *bfqq) +{ + bfq_log_bfqq(bfqd, bfqq, +"softrt_next_start: service_blkg %lu soft_rate %u sects/sec interval %u", + bfqq->service_from_backlogged, + bfqd->bfq_wr_max_softrt_rate, + jiffies_to_msecs(HZ * bfqq->service_from_backlogged / + bfqd->bfq_wr_max_softrt_rate)); + + return max(bfqq->last_idle_bklogged + + HZ * bfqq->service_from_backlogged / + bfqd->bfq_wr_max_softrt_rate, + jiffies + nsecs_to_jiffies(bfqq->bfqd->bfq_slice_idle) + 4); +} + +/** + * bfq_bfqq_expire - expire a queue. + * @bfqd: device owning the queue. + * @bfqq: the queue to expire. + * @compensate: if true, compensate for the time spent idling. + * @reason: the reason causing the expiration. + * + * If the process associated with bfqq does slow I/O (e.g., because it + * issues random requests), we charge bfqq with the time it has been + * in service instead of the service it has received (see + * bfq_bfqq_charge_time for details on how this goal is achieved). As + * a consequence, bfqq will typically get higher timestamps upon + * reactivation, and hence it will be rescheduled as if it had + * received more service than what it has actually received. In the + * end, bfqq receives less service in proportion to how slowly its + * associated process consumes its budgets (and hence how seriously it + * tends to lower the throughput). In addition, this time-charging + * strategy guarantees time fairness among slow processes. In + * contrast, if the process associated with bfqq is not slow, we + * charge bfqq exactly with the service it has received. + * + * Charging time to the first type of queues and the exact service to + * the other has the effect of using the WF2Q+ policy to schedule the + * former on a timeslice basis, without violating service domain + * guarantees among the latter. + */ +static void bfq_bfqq_expire(struct bfq_data *bfqd, + struct bfq_queue *bfqq, + bool compensate, + enum bfqq_expiration reason) +{ + bool slow; + unsigned long delta = 0; + struct bfq_entity *entity = &bfqq->entity; + int ref; + + BUG_ON(bfqq != bfqd->in_service_queue); + + /* + * Check whether the process is slow (see bfq_bfqq_is_slow). + */ + slow = bfq_bfqq_is_slow(bfqd, bfqq, compensate, reason, &delta); + + /* + * Increase service_from_backlogged before next statement, + * because the possible next invocation of + * bfq_bfqq_charge_time would likely inflate + * entity->service. In contrast, service_from_backlogged must + * contain real service, to enable the soft real-time + * heuristic to correctly compute the bandwidth consumed by + * bfqq. + */ + bfqq->service_from_backlogged += entity->service; + + /* + * As above explained, charge slow (typically seeky) and + * timed-out queues with the time and not the service + * received, to favor sequential workloads. + * + * Processes doing I/O in the slower disk zones will tend to + * be slow(er) even if not seeky. Therefore, since the + * estimated peak rate is actually an average over the disk + * surface, these processes may timeout just for bad luck. To + * avoid punishing them, do not charge time to processes that + * succeeded in consuming at least 2/3 of their budget. This + * allows BFQ to preserve enough elasticity to still perform + * bandwidth, and not time, distribution with little unlucky + * or quasi-sequential processes. + */ + if (bfqq->wr_coeff == 1 && + (slow || + (reason == BFQ_BFQQ_BUDGET_TIMEOUT && + bfq_bfqq_budget_left(bfqq) >= entity->budget / 3))) + bfq_bfqq_charge_time(bfqd, bfqq, delta); + + BUG_ON(bfqq->entity.budget < bfqq->entity.service); + + if (reason == BFQ_BFQQ_TOO_IDLE && + entity->service <= 2 * entity->budget / 10) + bfq_clear_bfqq_IO_bound(bfqq); + + if (bfqd->low_latency && bfqq->wr_coeff == 1) + bfqq->last_wr_start_finish = jiffies; + + if (bfqd->low_latency && bfqd->bfq_wr_max_softrt_rate > 0 && + RB_EMPTY_ROOT(&bfqq->sort_list)) { + /* + * If we get here, and there are no outstanding + * requests, then the request pattern is isochronous + * (see the comments on the function + * bfq_bfqq_softrt_next_start()). Thus we can compute + * soft_rt_next_start. If, instead, the queue still + * has outstanding requests, then we have to wait for + * the completion of all the outstanding requests to + * discover whether the request pattern is actually + * isochronous. + */ + BUG_ON(bfqd->busy_queues < 1); + if (bfqq->dispatched == 0) { + bfqq->soft_rt_next_start = + bfq_bfqq_softrt_next_start(bfqd, bfqq); + bfq_log_bfqq(bfqd, bfqq, "new soft_rt_next %lu", + bfqq->soft_rt_next_start); + } else { + /* + * The application is still waiting for the + * completion of one or more requests: + * prevent it from possibly being incorrectly + * deemed as soft real-time by setting its + * soft_rt_next_start to infinity. In fact, + * without this assignment, the application + * would be incorrectly deemed as soft + * real-time if: + * 1) it issued a new request before the + * completion of all its in-flight + * requests, and + * 2) at that time, its soft_rt_next_start + * happened to be in the past. + */ + bfqq->soft_rt_next_start = + bfq_greatest_from_now(); + /* + * Schedule an update of soft_rt_next_start to when + * the task may be discovered to be isochronous. + */ + bfq_mark_bfqq_softrt_update(bfqq); + } + } + + bfq_log_bfqq(bfqd, bfqq, + "expire (%d, slow %d, num_disp %d, short_ttime %d, weight %d)", + reason, slow, bfqq->dispatched, + bfq_bfqq_has_short_ttime(bfqq), entity->weight); + + /* + * Increase, decrease or leave budget unchanged according to + * reason. + */ + BUG_ON(bfqq->entity.budget < bfqq->entity.service); + __bfq_bfqq_recalc_budget(bfqd, bfqq, reason); + BUG_ON(bfqq->next_rq == NULL && + bfqq->entity.budget < bfqq->entity.service); + ref = bfqq->ref; + __bfq_bfqq_expire(bfqd, bfqq); + + BUG_ON(ref > 1 && + !bfq_bfqq_busy(bfqq) && reason == BFQ_BFQQ_BUDGET_EXHAUSTED && + !bfq_class_idle(bfqq)); + + /* mark bfqq as waiting a request only if a bic still points to it */ + if (ref > 1 && !bfq_bfqq_busy(bfqq) && + reason != BFQ_BFQQ_BUDGET_TIMEOUT && + reason != BFQ_BFQQ_BUDGET_EXHAUSTED) + bfq_mark_bfqq_non_blocking_wait_rq(bfqq); +} + +/* + * Budget timeout is not implemented through a dedicated timer, but + * just checked on request arrivals and completions, as well as on + * idle timer expirations. + */ +static bool bfq_bfqq_budget_timeout(struct bfq_queue *bfqq) +{ + return time_is_before_eq_jiffies(bfqq->budget_timeout); +} + +/* + * If we expire a queue that is actively waiting (i.e., with the + * device idled) for the arrival of a new request, then we may incur + * the timestamp misalignment problem described in the body of the + * function __bfq_activate_entity. Hence we return true only if this + * condition does not hold, or if the queue is slow enough to deserve + * only to be kicked off for preserving a high throughput. + */ +static bool bfq_may_expire_for_budg_timeout(struct bfq_queue *bfqq) +{ + bfq_log_bfqq(bfqq->bfqd, bfqq, + "may_budget_timeout: wait_request %d left %d timeout %d", + bfq_bfqq_wait_request(bfqq), + bfq_bfqq_budget_left(bfqq) >= bfqq->entity.budget / 3, + bfq_bfqq_budget_timeout(bfqq)); + + return (!bfq_bfqq_wait_request(bfqq) || + bfq_bfqq_budget_left(bfqq) >= bfqq->entity.budget / 3) + && + bfq_bfqq_budget_timeout(bfqq); +} + +/* + * For a queue that becomes empty, device idling is allowed only if + * this function returns true for that queue. As a consequence, since + * device idling plays a critical role for both throughput boosting + * and service guarantees, the return value of this function plays a + * critical role as well. + * + * In a nutshell, this function returns true only if idling is + * beneficial for throughput or, even if detrimental for throughput, + * idling is however necessary to preserve service guarantees (low + * latency, desired throughput distribution, ...). In particular, on + * NCQ-capable devices, this function tries to return false, so as to + * help keep the drives' internal queues full, whenever this helps the + * device boost the throughput without causing any service-guarantee + * issue. + * + * In more detail, the return value of this function is obtained by, + * first, computing a number of boolean variables that take into + * account throughput and service-guarantee issues, and, then, + * combining these variables in a logical expression. Most of the + * issues taken into account are not trivial. We discuss these issues + * while introducing the variables. + */ +static bool bfq_bfqq_may_idle(struct bfq_queue *bfqq) +{ + struct bfq_data *bfqd = bfqq->bfqd; + bool rot_without_queueing = + !blk_queue_nonrot(bfqd->queue) && !bfqd->hw_tag, + bfqq_sequential_and_IO_bound, + idling_boosts_thr, idling_boosts_thr_without_issues, + idling_needed_for_service_guarantees, + asymmetric_scenario; + + if (bfqd->strict_guarantees) + return true; + + /* + * Idling is performed only if slice_idle > 0. In addition, we + * do not idle if + * (a) bfqq is async + * (b) bfqq is in the idle io prio class: in this case we do + * not idle because we want to minimize the bandwidth that + * queues in this class can steal to higher-priority queues + */ + if (bfqd->bfq_slice_idle == 0 || !bfq_bfqq_sync(bfqq) || + bfq_class_idle(bfqq)) + return false; + + bfqq_sequential_and_IO_bound = !BFQQ_SEEKY(bfqq) && + bfq_bfqq_IO_bound(bfqq) && bfq_bfqq_has_short_ttime(bfqq); + /* + * The next variable takes into account the cases where idling + * boosts the throughput. + * + * The value of the variable is computed considering, first, that + * idling is virtually always beneficial for the throughput if: + * (a) the device is not NCQ-capable and rotational, or + * (b) regardless of the presence of NCQ, the device is rotational and + * the request pattern for bfqq is I/O-bound and sequential, or + * (c) regardless of whether it is rotational, the device is + * not NCQ-capable and the request pattern for bfqq is + * I/O-bound and sequential. + * + * Secondly, and in contrast to the above item (b), idling an + * NCQ-capable flash-based device would not boost the + * throughput even with sequential I/O; rather it would lower + * the throughput in proportion to how fast the device + * is. Accordingly, the next variable is true if any of the + * above conditions (a), (b) or (c) is true, and, in + * particular, happens to be false if bfqd is an NCQ-capable + * flash-based device. + */ + idling_boosts_thr = rot_without_queueing || + ((!blk_queue_nonrot(bfqd->queue) || !bfqd->hw_tag) && + bfqq_sequential_and_IO_bound); + + /* + * The value of the next variable, + * idling_boosts_thr_without_issues, is equal to that of + * idling_boosts_thr, unless a special case holds. In this + * special case, described below, idling may cause problems to + * weight-raised queues. + * + * When the request pool is saturated (e.g., in the presence + * of write hogs), if the processes associated with + * non-weight-raised queues ask for requests at a lower rate, + * then processes associated with weight-raised queues have a + * higher probability to get a request from the pool + * immediately (or at least soon) when they need one. Thus + * they have a higher probability to actually get a fraction + * of the device throughput proportional to their high + * weight. This is especially true with NCQ-capable drives, + * which enqueue several requests in advance, and further + * reorder internally-queued requests. + * + * For this reason, we force to false the value of + * idling_boosts_thr_without_issues if there are weight-raised + * busy queues. In this case, and if bfqq is not weight-raised, + * this guarantees that the device is not idled for bfqq (if, + * instead, bfqq is weight-raised, then idling will be + * guaranteed by another variable, see below). Combined with + * the timestamping rules of BFQ (see [1] for details), this + * behavior causes bfqq, and hence any sync non-weight-raised + * queue, to get a lower number of requests served, and thus + * to ask for a lower number of requests from the request + * pool, before the busy weight-raised queues get served + * again. This often mitigates starvation problems in the + * presence of heavy write workloads and NCQ, thereby + * guaranteeing a higher application and system responsiveness + * in these hostile scenarios. + */ + idling_boosts_thr_without_issues = idling_boosts_thr && + bfqd->wr_busy_queues == 0; + + /* + * There is then a case where idling must be performed not + * for throughput concerns, but to preserve service + * guarantees. + * + * To introduce this case, we can note that allowing the drive + * to enqueue more than one request at a time, and hence + * delegating de facto final scheduling decisions to the + * drive's internal scheduler, entails loss of control on the + * actual request service order. In particular, the critical + * situation is when requests from different processes happen + * to be present, at the same time, in the internal queue(s) + * of the drive. In such a situation, the drive, by deciding + * the service order of the internally-queued requests, does + * determine also the actual throughput distribution among + * these processes. But the drive typically has no notion or + * concern about per-process throughput distribution, and + * makes its decisions only on a per-request basis. Therefore, + * the service distribution enforced by the drive's internal + * scheduler is likely to coincide with the desired + * device-throughput distribution only in a completely + * symmetric scenario where: + * (i) each of these processes must get the same throughput as + * the others; + * (ii) all these processes have the same I/O pattern + * (either sequential or random). + * In fact, in such a scenario, the drive will tend to treat + * the requests of each of these processes in about the same + * way as the requests of the others, and thus to provide + * each of these processes with about the same throughput + * (which is exactly the desired throughput distribution). In + * contrast, in any asymmetric scenario, device idling is + * certainly needed to guarantee that bfqq receives its + * assigned fraction of the device throughput (see [1] for + * details). + * + * We address this issue by controlling, actually, only the + * symmetry sub-condition (i), i.e., provided that + * sub-condition (i) holds, idling is not performed, + * regardless of whether sub-condition (ii) holds. In other + * words, only if sub-condition (i) holds, then idling is + * allowed, and the device tends to be prevented from queueing + * many requests, possibly of several processes. The reason + * for not controlling also sub-condition (ii) is that we + * exploit preemption to preserve guarantees in case of + * symmetric scenarios, even if (ii) does not hold, as + * explained in the next two paragraphs. + * + * Even if a queue, say Q, is expired when it remains idle, Q + * can still preempt the new in-service queue if the next + * request of Q arrives soon (see the comments on + * bfq_bfqq_update_budg_for_activation). If all queues and + * groups have the same weight, this form of preemption, + * combined with the hole-recovery heuristic described in the + * comments on function bfq_bfqq_update_budg_for_activation, + * are enough to preserve a correct bandwidth distribution in + * the mid term, even without idling. In fact, even if not + * idling allows the internal queues of the device to contain + * many requests, and thus to reorder requests, we can rather + * safely assume that the internal scheduler still preserves a + * minimum of mid-term fairness. The motivation for using + * preemption instead of idling is that, by not idling, + * service guarantees are preserved without minimally + * sacrificing throughput. In other words, both a high + * throughput and its desired distribution are obtained. + * + * More precisely, this preemption-based, idleless approach + * provides fairness in terms of IOPS, and not sectors per + * second. This can be seen with a simple example. Suppose + * that there are two queues with the same weight, but that + * the first queue receives requests of 8 sectors, while the + * second queue receives requests of 1024 sectors. In + * addition, suppose that each of the two queues contains at + * most one request at a time, which implies that each queue + * always remains idle after it is served. Finally, after + * remaining idle, each queue receives very quickly a new + * request. It follows that the two queues are served + * alternatively, preempting each other if needed. This + * implies that, although both queues have the same weight, + * the queue with large requests receives a service that is + * 1024/8 times as high as the service received by the other + * queue. + * + * On the other hand, device idling is performed, and thus + * pure sector-domain guarantees are provided, for the + * following queues, which are likely to need stronger + * throughput guarantees: weight-raised queues, and queues + * with a higher weight than other queues. When such queues + * are active, sub-condition (i) is false, which triggers + * device idling. + * + * According to the above considerations, the next variable is + * true (only) if sub-condition (i) holds. To compute the + * value of this variable, we not only use the return value of + * the function bfq_symmetric_scenario(), but also check + * whether bfqq is being weight-raised, because + * bfq_symmetric_scenario() does not take into account also + * weight-raised queues (see comments on + * bfq_weights_tree_add()). + * + * As a side note, it is worth considering that the above + * device-idling countermeasures may however fail in the + * following unlucky scenario: if idling is (correctly) + * disabled in a time period during which all symmetry + * sub-conditions hold, and hence the device is allowed to + * enqueue many requests, but at some later point in time some + * sub-condition stops to hold, then it may become impossible + * to let requests be served in the desired order until all + * the requests already queued in the device have been served. + */ + asymmetric_scenario = bfqq->wr_coeff > 1 || + !bfq_symmetric_scenario(bfqd); + + /* + * Finally, there is a case where maximizing throughput is the + * best choice even if it may cause unfairness toward + * bfqq. Such a case is when bfqq became active in a burst of + * queue activations. Queues that became active during a large + * burst benefit only from throughput, as discussed in the + * comments on bfq_handle_burst. Thus, if bfqq became active + * in a burst and not idling the device maximizes throughput, + * then the device must no be idled, because not idling the + * device provides bfqq and all other queues in the burst with + * maximum benefit. Combining this and the above case, we can + * now establish when idling is actually needed to preserve + * service guarantees. + */ + idling_needed_for_service_guarantees = + asymmetric_scenario && !bfq_bfqq_in_large_burst(bfqq); + + /* + * We have now all the components we need to compute the + * return value of the function, which is true only if idling + * either boosts the throughput (without issues), or is + * necessary to preserve service guarantees. + */ + bfq_log_bfqq(bfqd, bfqq, "may_idle: sync %d idling_boosts_thr %d", + bfq_bfqq_sync(bfqq), idling_boosts_thr); + + bfq_log_bfqq(bfqd, bfqq, + "may_idle: wr_busy %d boosts %d IO-bound %d guar %d", + bfqd->wr_busy_queues, + idling_boosts_thr_without_issues, + bfq_bfqq_IO_bound(bfqq), + idling_needed_for_service_guarantees); + + return idling_boosts_thr_without_issues || + idling_needed_for_service_guarantees; +} + +/* + * If the in-service queue is empty but the function bfq_bfqq_may_idle + * returns true, then: + * 1) the queue must remain in service and cannot be expired, and + * 2) the device must be idled to wait for the possible arrival of a new + * request for the queue. + * See the comments on the function bfq_bfqq_may_idle for the reasons + * why performing device idling is the best choice to boost the throughput + * and preserve service guarantees when bfq_bfqq_may_idle itself + * returns true. + */ +static bool bfq_bfqq_must_idle(struct bfq_queue *bfqq) +{ + return RB_EMPTY_ROOT(&bfqq->sort_list) && bfq_bfqq_may_idle(bfqq); +} + +/* + * Select a queue for service. If we have a current queue in service, + * check whether to continue servicing it, or retrieve and set a new one. + */ +static struct bfq_queue *bfq_select_queue(struct bfq_data *bfqd) +{ + struct bfq_queue *bfqq; + struct request *next_rq; + enum bfqq_expiration reason = BFQ_BFQQ_BUDGET_TIMEOUT; + + bfqq = bfqd->in_service_queue; + if (!bfqq) + goto new_queue; + + bfq_log_bfqq(bfqd, bfqq, "select_queue: already in-service queue"); + + if (bfq_may_expire_for_budg_timeout(bfqq) && + !hrtimer_active(&bfqd->idle_slice_timer) && + !bfq_bfqq_must_idle(bfqq)) + goto expire; + +check_queue: + /* + * This loop is rarely executed more than once. Even when it + * happens, it is much more convenient to re-execute this loop + * than to return NULL and trigger a new dispatch to get a + * request served. + */ + next_rq = bfqq->next_rq; + /* + * If bfqq has requests queued and it has enough budget left to + * serve them, keep the queue, otherwise expire it. + */ + if (next_rq) { + BUG_ON(RB_EMPTY_ROOT(&bfqq->sort_list)); + + if (bfq_serv_to_charge(next_rq, bfqq) > + bfq_bfqq_budget_left(bfqq)) { + /* + * Expire the queue for budget exhaustion, + * which makes sure that the next budget is + * enough to serve the next request, even if + * it comes from the fifo expired path. + */ + reason = BFQ_BFQQ_BUDGET_EXHAUSTED; + goto expire; + } else { + /* + * The idle timer may be pending because we may + * not disable disk idling even when a new request + * arrives. + */ + if (bfq_bfqq_wait_request(bfqq)) { + BUG_ON(!hrtimer_active(&bfqd->idle_slice_timer)); + /* + * If we get here: 1) at least a new request + * has arrived but we have not disabled the + * timer because the request was too small, + * 2) then the block layer has unplugged + * the device, causing the dispatch to be + * invoked. + * + * Since the device is unplugged, now the + * requests are probably large enough to + * provide a reasonable throughput. + * So we disable idling. + */ + bfq_clear_bfqq_wait_request(bfqq); + hrtimer_try_to_cancel(&bfqd->idle_slice_timer); + bfqg_stats_update_idle_time(bfqq_group(bfqq)); + } + goto keep_queue; + } + } + + /* + * No requests pending. However, if the in-service queue is idling + * for a new request, or has requests waiting for a completion and + * may idle after their completion, then keep it anyway. + */ + if (hrtimer_active(&bfqd->idle_slice_timer) || + (bfqq->dispatched != 0 && bfq_bfqq_may_idle(bfqq))) { + bfqq = NULL; + goto keep_queue; + } + + reason = BFQ_BFQQ_NO_MORE_REQUESTS; +expire: + bfq_bfqq_expire(bfqd, bfqq, false, reason); +new_queue: + bfqq = bfq_set_in_service_queue(bfqd); + if (bfqq) { + bfq_log_bfqq(bfqd, bfqq, "select_queue: checking new queue"); + goto check_queue; + } +keep_queue: + if (bfqq) + bfq_log_bfqq(bfqd, bfqq, "select_queue: returned this queue"); + else + bfq_log(bfqd, "select_queue: no queue returned"); + + return bfqq; +} + +static void bfq_update_wr_data(struct bfq_data *bfqd, struct bfq_queue *bfqq) +{ + struct bfq_entity *entity = &bfqq->entity; + + if (bfqq->wr_coeff > 1) { /* queue is being weight-raised */ + BUG_ON(bfqq->wr_cur_max_time == bfqd->bfq_wr_rt_max_time && + time_is_after_jiffies(bfqq->last_wr_start_finish)); + + bfq_log_bfqq(bfqd, bfqq, + "raising period dur %u/%u msec, old coeff %u, w %d(%d)", + jiffies_to_msecs(jiffies - bfqq->last_wr_start_finish), + jiffies_to_msecs(bfqq->wr_cur_max_time), + bfqq->wr_coeff, + bfqq->entity.weight, bfqq->entity.orig_weight); + + BUG_ON(bfqq != bfqd->in_service_queue && entity->weight != + entity->orig_weight * bfqq->wr_coeff); + if (entity->prio_changed) + bfq_log_bfqq(bfqd, bfqq, "WARN: pending prio change"); + + /* + * If the queue was activated in a burst, or too much + * time has elapsed from the beginning of this + * weight-raising period, then end weight raising. + */ + if (bfq_bfqq_in_large_burst(bfqq)) + bfq_bfqq_end_wr(bfqq); + else if (time_is_before_jiffies(bfqq->last_wr_start_finish + + bfqq->wr_cur_max_time)) { + if (bfqq->wr_cur_max_time != bfqd->bfq_wr_rt_max_time || + time_is_before_jiffies(bfqq->wr_start_at_switch_to_srt + + bfq_wr_duration(bfqd))) + bfq_bfqq_end_wr(bfqq); + else { + /* switch back to interactive wr */ + bfqq->wr_coeff = bfqd->bfq_wr_coeff; + bfqq->wr_cur_max_time = bfq_wr_duration(bfqd); + bfqq->last_wr_start_finish = + bfqq->wr_start_at_switch_to_srt; + BUG_ON(time_is_after_jiffies( + bfqq->last_wr_start_finish)); + bfqq->entity.prio_changed = 1; + bfq_log_bfqq(bfqd, bfqq, + "back to interactive wr"); + } + } + } + /* + * To improve latency (for this or other queues), immediately + * update weight both if it must be raised and if it must be + * lowered. Since, entity may be on some active tree here, and + * might have a pending change of its ioprio class, invoke + * next function with the last parameter unset (see the + * comments on the function). + */ + if ((entity->weight > entity->orig_weight) != (bfqq->wr_coeff > 1)) + __bfq_entity_update_weight_prio(bfq_entity_service_tree(entity), + entity, false); +} + +/* + * Dispatch one request from bfqq, moving it to the request queue + * dispatch list. + */ +static int bfq_dispatch_request(struct bfq_data *bfqd, + struct bfq_queue *bfqq) +{ + int dispatched = 0; + struct request *rq = bfqq->next_rq; + unsigned long service_to_charge; + + BUG_ON(RB_EMPTY_ROOT(&bfqq->sort_list)); + BUG_ON(!rq); + service_to_charge = bfq_serv_to_charge(rq, bfqq); + + BUG_ON(service_to_charge > bfq_bfqq_budget_left(bfqq)); + + BUG_ON(bfqq->entity.budget < bfqq->entity.service); + + bfq_bfqq_served(bfqq, service_to_charge); + + BUG_ON(bfqq->entity.budget < bfqq->entity.service); + + bfq_dispatch_insert(bfqd->queue, rq); + + /* + * If weight raising has to terminate for bfqq, then next + * function causes an immediate update of bfqq's weight, + * without waiting for next activation. As a consequence, on + * expiration, bfqq will be timestamped as if has never been + * weight-raised during this service slot, even if it has + * received part or even most of the service as a + * weight-raised queue. This inflates bfqq's timestamps, which + * is beneficial, as bfqq is then more willing to leave the + * device immediately to possible other weight-raised queues. + */ + bfq_update_wr_data(bfqd, bfqq); + + bfq_log_bfqq(bfqd, bfqq, + "dispatched %u sec req (%llu), budg left %d", + blk_rq_sectors(rq), + (unsigned long long) blk_rq_pos(rq), + bfq_bfqq_budget_left(bfqq)); + + dispatched++; + + if (!bfqd->in_service_bic) { + atomic_long_inc(&RQ_BIC(rq)->icq.ioc->refcount); + bfqd->in_service_bic = RQ_BIC(rq); + BUG_ON(!bfqd->in_service_bic); + } + + if (bfqd->busy_queues > 1 && bfq_class_idle(bfqq)) + goto expire; + + return dispatched; + +expire: + bfq_bfqq_expire(bfqd, bfqq, false, BFQ_BFQQ_BUDGET_EXHAUSTED); + return dispatched; +} + +static int __bfq_forced_dispatch_bfqq(struct bfq_queue *bfqq) +{ + int dispatched = 0; + + while (bfqq->next_rq) { + bfq_dispatch_insert(bfqq->bfqd->queue, bfqq->next_rq); + dispatched++; + } + + BUG_ON(!list_empty(&bfqq->fifo)); + return dispatched; +} + +/* + * Drain our current requests. + * Used for barriers and when switching io schedulers on-the-fly. + */ +static int bfq_forced_dispatch(struct bfq_data *bfqd) +{ + struct bfq_queue *bfqq, *n; + struct bfq_service_tree *st; + int dispatched = 0; + + bfqq = bfqd->in_service_queue; + if (bfqq) + __bfq_bfqq_expire(bfqd, bfqq); + + /* + * Loop through classes, and be careful to leave the scheduler + * in a consistent state, as feedback mechanisms and vtime + * updates cannot be disabled during the process. + */ + list_for_each_entry_safe(bfqq, n, &bfqd->active_list, bfqq_list) { + st = bfq_entity_service_tree(&bfqq->entity); + + dispatched += __bfq_forced_dispatch_bfqq(bfqq); + + bfqq->max_budget = bfq_max_budget(bfqd); + bfq_forget_idle(st); + } + + BUG_ON(bfqd->busy_queues != 0); + + return dispatched; +} + +static int bfq_dispatch_requests(struct request_queue *q, int force) +{ + struct bfq_data *bfqd = q->elevator->elevator_data; + struct bfq_queue *bfqq; + + bfq_log(bfqd, "dispatch requests: %d busy queues", bfqd->busy_queues); + + if (bfqd->busy_queues == 0) + return 0; + + if (unlikely(force)) + return bfq_forced_dispatch(bfqd); + + /* + * Force device to serve one request at a time if + * strict_guarantees is true. Forcing this service scheme is + * currently the ONLY way to guarantee that the request + * service order enforced by the scheduler is respected by a + * queueing device. Otherwise the device is free even to make + * some unlucky request wait for as long as the device + * wishes. + * + * Of course, serving one request at at time may cause loss of + * throughput. + */ + if (bfqd->strict_guarantees && bfqd->rq_in_driver > 0) + return 0; + + bfqq = bfq_select_queue(bfqd); + if (!bfqq) + return 0; + + BUG_ON(bfqq->entity.budget < bfqq->entity.service); + + BUG_ON(bfq_bfqq_wait_request(bfqq)); + + if (!bfq_dispatch_request(bfqd, bfqq)) + return 0; + + bfq_log_bfqq(bfqd, bfqq, "dispatched %s request", + bfq_bfqq_sync(bfqq) ? "sync" : "async"); + + BUG_ON(bfqq->next_rq == NULL && + bfqq->entity.budget < bfqq->entity.service); + return 1; +} + +/* + * Task holds one reference to the queue, dropped when task exits. Each rq + * in-flight on this queue also holds a reference, dropped when rq is freed. + * + * Queue lock must be held here. Recall not to use bfqq after calling + * this function on it. + */ +static void bfq_put_queue(struct bfq_queue *bfqq) +{ +#ifdef BFQ_GROUP_IOSCHED_ENABLED + struct bfq_group *bfqg = bfqq_group(bfqq); +#endif + + BUG_ON(bfqq->ref <= 0); + + bfq_log_bfqq(bfqq->bfqd, bfqq, "put_queue: %p %d", bfqq, bfqq->ref); + bfqq->ref--; + if (bfqq->ref) + return; + + BUG_ON(rb_first(&bfqq->sort_list)); + BUG_ON(bfqq->allocated[READ] + bfqq->allocated[WRITE] != 0); + BUG_ON(bfqq->entity.tree); + BUG_ON(bfq_bfqq_busy(bfqq)); + + if (bfq_bfqq_sync(bfqq)) + /* + * The fact that this queue is being destroyed does not + * invalidate the fact that this queue may have been + * activated during the current burst. As a consequence, + * although the queue does not exist anymore, and hence + * needs to be removed from the burst list if there, + * the burst size has not to be decremented. + */ + hlist_del_init(&bfqq->burst_list_node); + + bfq_log_bfqq(bfqq->bfqd, bfqq, "put_queue: %p freed", bfqq); + + kmem_cache_free(bfq_pool, bfqq); +#ifdef BFQ_GROUP_IOSCHED_ENABLED + bfqg_put(bfqg); +#endif +} + +static void bfq_put_cooperator(struct bfq_queue *bfqq) +{ + struct bfq_queue *__bfqq, *next; + + /* + * If this queue was scheduled to merge with another queue, be + * sure to drop the reference taken on that queue (and others in + * the merge chain). See bfq_setup_merge and bfq_merge_bfqqs. + */ + __bfqq = bfqq->new_bfqq; + while (__bfqq) { + if (__bfqq == bfqq) + break; + next = __bfqq->new_bfqq; + bfq_put_queue(__bfqq); + __bfqq = next; + } +} + +static void bfq_exit_bfqq(struct bfq_data *bfqd, struct bfq_queue *bfqq) +{ + if (bfqq == bfqd->in_service_queue) { + __bfq_bfqq_expire(bfqd, bfqq); + bfq_schedule_dispatch(bfqd); + } + + bfq_log_bfqq(bfqd, bfqq, "exit_bfqq: %p, %d", bfqq, bfqq->ref); + + bfq_put_cooperator(bfqq); + + bfq_put_queue(bfqq); /* release process reference */ +} + +static void bfq_init_icq(struct io_cq *icq) +{ + icq_to_bic(icq)->ttime.last_end_request = ktime_get_ns() - (1ULL<<32); +} + +static void bfq_exit_icq(struct io_cq *icq) +{ + struct bfq_io_cq *bic = icq_to_bic(icq); + struct bfq_data *bfqd = bic_to_bfqd(bic); + + if (bic_to_bfqq(bic, false)) { + bfq_exit_bfqq(bfqd, bic_to_bfqq(bic, false)); + bic_set_bfqq(bic, NULL, false); + } + + if (bic_to_bfqq(bic, true)) { + /* + * If the bic is using a shared queue, put the reference + * taken on the io_context when the bic started using a + * shared bfq_queue. + */ + if (bfq_bfqq_coop(bic_to_bfqq(bic, true))) + put_io_context(icq->ioc); + bfq_exit_bfqq(bfqd, bic_to_bfqq(bic, true)); + bic_set_bfqq(bic, NULL, true); + } +} + +/* + * Update the entity prio values; note that the new values will not + * be used until the next (re)activation. + */ +static void bfq_set_next_ioprio_data(struct bfq_queue *bfqq, + struct bfq_io_cq *bic) +{ + struct task_struct *tsk = current; + int ioprio_class; + + ioprio_class = IOPRIO_PRIO_CLASS(bic->ioprio); + switch (ioprio_class) { + default: + dev_err(bfqq->bfqd->queue->backing_dev_info->dev, + "bfq: bad prio class %d\n", ioprio_class); + case IOPRIO_CLASS_NONE: + /* + * No prio set, inherit CPU scheduling settings. + */ + bfqq->new_ioprio = task_nice_ioprio(tsk); + bfqq->new_ioprio_class = task_nice_ioclass(tsk); + break; + case IOPRIO_CLASS_RT: + bfqq->new_ioprio = IOPRIO_PRIO_DATA(bic->ioprio); + bfqq->new_ioprio_class = IOPRIO_CLASS_RT; + break; + case IOPRIO_CLASS_BE: + bfqq->new_ioprio = IOPRIO_PRIO_DATA(bic->ioprio); + bfqq->new_ioprio_class = IOPRIO_CLASS_BE; + break; + case IOPRIO_CLASS_IDLE: + bfqq->new_ioprio_class = IOPRIO_CLASS_IDLE; + bfqq->new_ioprio = 7; + break; + } + + if (bfqq->new_ioprio >= IOPRIO_BE_NR) { + pr_crit("bfq_set_next_ioprio_data: new_ioprio %d\n", + bfqq->new_ioprio); + BUG(); + } + + bfqq->entity.new_weight = bfq_ioprio_to_weight(bfqq->new_ioprio); + bfqq->entity.prio_changed = 1; + bfq_log_bfqq(bfqq->bfqd, bfqq, + "set_next_ioprio_data: bic_class %d prio %d class %d", + ioprio_class, bfqq->new_ioprio, bfqq->new_ioprio_class); +} + +static void bfq_check_ioprio_change(struct bfq_io_cq *bic, struct bio *bio) +{ + struct bfq_data *bfqd = bic_to_bfqd(bic); + struct bfq_queue *bfqq; + unsigned long uninitialized_var(flags); + int ioprio = bic->icq.ioc->ioprio; + + /* + * This condition may trigger on a newly created bic, be sure to + * drop the lock before returning. + */ + if (unlikely(!bfqd) || likely(bic->ioprio == ioprio)) + return; + + bic->ioprio = ioprio; + + bfqq = bic_to_bfqq(bic, false); + if (bfqq) { + /* release process reference on this queue */ + bfq_put_queue(bfqq); + bfqq = bfq_get_queue(bfqd, bio, BLK_RW_ASYNC, bic); + bic_set_bfqq(bic, bfqq, false); + bfq_log_bfqq(bfqd, bfqq, + "check_ioprio_change: bfqq %p %d", + bfqq, bfqq->ref); + } + + bfqq = bic_to_bfqq(bic, true); + if (bfqq) + bfq_set_next_ioprio_data(bfqq, bic); +} + +static void bfq_init_bfqq(struct bfq_data *bfqd, struct bfq_queue *bfqq, + struct bfq_io_cq *bic, pid_t pid, int is_sync) +{ + RB_CLEAR_NODE(&bfqq->entity.rb_node); + INIT_LIST_HEAD(&bfqq->fifo); + INIT_HLIST_NODE(&bfqq->burst_list_node); + BUG_ON(!hlist_unhashed(&bfqq->burst_list_node)); + + bfqq->ref = 0; + bfqq->bfqd = bfqd; + + if (bic) + bfq_set_next_ioprio_data(bfqq, bic); + + if (is_sync) { + /* + * No need to mark as has_short_ttime if in + * idle_class, because no device idling is performed + * for queues in idle class + */ + if (!bfq_class_idle(bfqq)) + /* tentatively mark as has_short_ttime */ + bfq_mark_bfqq_has_short_ttime(bfqq); + bfq_mark_bfqq_sync(bfqq); + bfq_mark_bfqq_just_created(bfqq); + } else + bfq_clear_bfqq_sync(bfqq); + bfq_mark_bfqq_IO_bound(bfqq); + + /* Tentative initial value to trade off between thr and lat */ + bfqq->max_budget = (2 * bfq_max_budget(bfqd)) / 3; + bfqq->pid = pid; + + bfqq->wr_coeff = 1; + bfqq->last_wr_start_finish = jiffies; + bfqq->wr_start_at_switch_to_srt = bfq_smallest_from_now(); + bfqq->budget_timeout = bfq_smallest_from_now(); + bfqq->split_time = bfq_smallest_from_now(); + + /* + * Set to the value for which bfqq will not be deemed as + * soft rt when it becomes backlogged. + */ + bfqq->soft_rt_next_start = bfq_greatest_from_now(); + + /* first request is almost certainly seeky */ + bfqq->seek_history = 1; +} + +static struct bfq_queue **bfq_async_queue_prio(struct bfq_data *bfqd, + struct bfq_group *bfqg, + int ioprio_class, int ioprio) +{ + switch (ioprio_class) { + case IOPRIO_CLASS_RT: + return &bfqg->async_bfqq[0][ioprio]; + case IOPRIO_CLASS_NONE: + ioprio = IOPRIO_NORM; + /* fall through */ + case IOPRIO_CLASS_BE: + return &bfqg->async_bfqq[1][ioprio]; + case IOPRIO_CLASS_IDLE: + return &bfqg->async_idle_bfqq; + default: + BUG(); + } +} + +static struct bfq_queue *bfq_get_queue(struct bfq_data *bfqd, + struct bio *bio, bool is_sync, + struct bfq_io_cq *bic) +{ + const int ioprio = IOPRIO_PRIO_DATA(bic->ioprio); + const int ioprio_class = IOPRIO_PRIO_CLASS(bic->ioprio); + struct bfq_queue **async_bfqq = NULL; + struct bfq_queue *bfqq; + struct bfq_group *bfqg; + + rcu_read_lock(); + + bfqg = bfq_find_set_group(bfqd, bio_blkcg(bio)); + if (!bfqg) { + bfqq = &bfqd->oom_bfqq; + goto out; + } + + if (!is_sync) { + async_bfqq = bfq_async_queue_prio(bfqd, bfqg, ioprio_class, + ioprio); + bfqq = *async_bfqq; + if (bfqq) + goto out; + } + + bfqq = kmem_cache_alloc_node(bfq_pool, + GFP_NOWAIT | __GFP_ZERO | __GFP_NOWARN, + bfqd->queue->node); + + if (bfqq) { + bfq_init_bfqq(bfqd, bfqq, bic, current->pid, + is_sync); + bfq_init_entity(&bfqq->entity, bfqg); + bfq_log_bfqq(bfqd, bfqq, "allocated"); + } else { + bfqq = &bfqd->oom_bfqq; + bfq_log_bfqq(bfqd, bfqq, "using oom bfqq"); + goto out; + } + + /* + * Pin the queue now that it's allocated, scheduler exit will + * prune it. + */ + if (async_bfqq) { + bfqq->ref++; /* + * Extra group reference, w.r.t. sync + * queue. This extra reference is removed + * only if bfqq->bfqg disappears, to + * guarantee that this queue is not freed + * until its group goes away. + */ + bfq_log_bfqq(bfqd, bfqq, "get_queue, bfqq not in async: %p, %d", + bfqq, bfqq->ref); + *async_bfqq = bfqq; + } + +out: + bfqq->ref++; /* get a process reference to this queue */ + bfq_log_bfqq(bfqd, bfqq, "get_queue, at end: %p, %d", bfqq, bfqq->ref); + rcu_read_unlock(); + return bfqq; +} + +static void bfq_update_io_thinktime(struct bfq_data *bfqd, + struct bfq_io_cq *bic) +{ + struct bfq_ttime *ttime = &bic->ttime; + u64 elapsed = ktime_get_ns() - bic->ttime.last_end_request; + + elapsed = min_t(u64, elapsed, 2 * bfqd->bfq_slice_idle); + + ttime->ttime_samples = (7*bic->ttime.ttime_samples + 256) / 8; + ttime->ttime_total = div_u64(7*ttime->ttime_total + 256*elapsed, 8); + ttime->ttime_mean = div64_ul(ttime->ttime_total + 128, + ttime->ttime_samples); +} + +static void +bfq_update_io_seektime(struct bfq_data *bfqd, struct bfq_queue *bfqq, + struct request *rq) +{ + bfqq->seek_history <<= 1; + bfqq->seek_history |= + get_sdist(bfqq->last_request_pos, rq) > BFQQ_SEEK_THR && + (!blk_queue_nonrot(bfqd->queue) || + blk_rq_sectors(rq) < BFQQ_SECT_THR_NONROT); +} + +static void bfq_update_has_short_ttime(struct bfq_data *bfqd, + struct bfq_queue *bfqq, + struct bfq_io_cq *bic) +{ + bool has_short_ttime = true; + + /* + * No need to update has_short_ttime if bfqq is async or in + * idle io prio class, or if bfq_slice_idle is zero, because + * no device idling is performed for bfqq in this case. + */ + if (!bfq_bfqq_sync(bfqq) || bfq_class_idle(bfqq) || + bfqd->bfq_slice_idle == 0) + return; + + /* Idle window just restored, statistics are meaningless. */ + if (time_is_after_eq_jiffies(bfqq->split_time + + bfqd->bfq_wr_min_idle_time)) + return; + + /* Think time is infinite if no process is linked to + * bfqq. Otherwise check average think time to + * decide whether to mark as has_short_ttime + */ + if (atomic_read(&bic->icq.ioc->active_ref) == 0 || + (bfq_sample_valid(bic->ttime.ttime_samples) && + bic->ttime.ttime_mean > bfqd->bfq_slice_idle)) + has_short_ttime = false; + + bfq_log_bfqq(bfqd, bfqq, "update_has_short_ttime: has_short_ttime %d", + has_short_ttime); + + if (has_short_ttime) + bfq_mark_bfqq_has_short_ttime(bfqq); + else + bfq_clear_bfqq_has_short_ttime(bfqq); +} + +/* + * Called when a new fs request (rq) is added to bfqq. Check if there's + * something we should do about it. + */ +static void bfq_rq_enqueued(struct bfq_data *bfqd, struct bfq_queue *bfqq, + struct request *rq) +{ + struct bfq_io_cq *bic = RQ_BIC(rq); + + if (rq->cmd_flags & REQ_META) + bfqq->meta_pending++; + + bfq_update_io_thinktime(bfqd, bic); + bfq_update_has_short_ttime(bfqd, bfqq, bic); + bfq_update_io_seektime(bfqd, bfqq, rq); + + bfq_log_bfqq(bfqd, bfqq, + "rq_enqueued: has_short_ttime=%d (seeky %d)", + bfq_bfqq_has_short_ttime(bfqq), BFQQ_SEEKY(bfqq)); + + bfqq->last_request_pos = blk_rq_pos(rq) + blk_rq_sectors(rq); + + if (bfqq == bfqd->in_service_queue && bfq_bfqq_wait_request(bfqq)) { + bool small_req = bfqq->queued[rq_is_sync(rq)] == 1 && + blk_rq_sectors(rq) < 32; + bool budget_timeout = bfq_bfqq_budget_timeout(bfqq); + + /* + * There is just this request queued: if the request + * is small and the queue is not to be expired, then + * just exit. + * + * In this way, if the device is being idled to wait + * for a new request from the in-service queue, we + * avoid unplugging the device and committing the + * device to serve just a small request. On the + * contrary, we wait for the block layer to decide + * when to unplug the device: hopefully, new requests + * will be merged to this one quickly, then the device + * will be unplugged and larger requests will be + * dispatched. + */ + if (small_req && !budget_timeout) + return; + + /* + * A large enough request arrived, or the queue is to + * be expired: in both cases disk idling is to be + * stopped, so clear wait_request flag and reset + * timer. + */ + bfq_clear_bfqq_wait_request(bfqq); + hrtimer_try_to_cancel(&bfqd->idle_slice_timer); + bfqg_stats_update_idle_time(bfqq_group(bfqq)); + + /* + * The queue is not empty, because a new request just + * arrived. Hence we can safely expire the queue, in + * case of budget timeout, without risking that the + * timestamps of the queue are not updated correctly. + * See [1] for more details. + */ + if (budget_timeout) + bfq_bfqq_expire(bfqd, bfqq, false, + BFQ_BFQQ_BUDGET_TIMEOUT); + + /* + * Let the request rip immediately, or let a new queue be + * selected if bfqq has just been expired. + */ + __blk_run_queue(bfqd->queue); + } +} + +static void bfq_insert_request(struct request_queue *q, struct request *rq) +{ + struct bfq_data *bfqd = q->elevator->elevator_data; + struct bfq_queue *bfqq = RQ_BFQQ(rq), *new_bfqq; + + assert_spin_locked(bfqd->queue->queue_lock); + + /* + * An unplug may trigger a requeue of a request from the device + * driver: make sure we are in process context while trying to + * merge two bfq_queues. + */ + if (!in_interrupt()) { + new_bfqq = bfq_setup_cooperator(bfqd, bfqq, rq, true); + if (new_bfqq) { + if (bic_to_bfqq(RQ_BIC(rq), 1) != bfqq) + new_bfqq = bic_to_bfqq(RQ_BIC(rq), 1); + /* + * Release the request's reference to the old bfqq + * and make sure one is taken to the shared queue. + */ + new_bfqq->allocated[rq_data_dir(rq)]++; + bfqq->allocated[rq_data_dir(rq)]--; + new_bfqq->ref++; + bfq_clear_bfqq_just_created(bfqq); + if (bic_to_bfqq(RQ_BIC(rq), 1) == bfqq) + bfq_merge_bfqqs(bfqd, RQ_BIC(rq), + bfqq, new_bfqq); + /* + * rq is about to be enqueued into new_bfqq, + * release rq reference on bfqq + */ + bfq_put_queue(bfqq); + rq->elv.priv[1] = new_bfqq; + bfqq = new_bfqq; + } + } + + bfq_add_request(rq); + + rq->fifo_time = ktime_get_ns() + bfqd->bfq_fifo_expire[rq_is_sync(rq)]; + list_add_tail(&rq->queuelist, &bfqq->fifo); + + bfq_rq_enqueued(bfqd, bfqq, rq); +} + +static void bfq_update_hw_tag(struct bfq_data *bfqd) +{ + bfqd->max_rq_in_driver = max_t(int, bfqd->max_rq_in_driver, + bfqd->rq_in_driver); + + if (bfqd->hw_tag == 1) + return; + + /* + * This sample is valid if the number of outstanding requests + * is large enough to allow a queueing behavior. Note that the + * sum is not exact, as it's not taking into account deactivated + * requests. + */ + if (bfqd->rq_in_driver + bfqd->queued < BFQ_HW_QUEUE_THRESHOLD) + return; + + if (bfqd->hw_tag_samples++ < BFQ_HW_QUEUE_SAMPLES) + return; + + bfqd->hw_tag = bfqd->max_rq_in_driver > BFQ_HW_QUEUE_THRESHOLD; + bfqd->max_rq_in_driver = 0; + bfqd->hw_tag_samples = 0; +} + +static void bfq_completed_request(struct request_queue *q, struct request *rq) +{ + struct bfq_queue *bfqq = RQ_BFQQ(rq); + struct bfq_data *bfqd = bfqq->bfqd; + u64 now_ns; + u32 delta_us; + + bfq_log_bfqq(bfqd, bfqq, "completed one req with %u sects left", + blk_rq_sectors(rq)); + + assert_spin_locked(bfqd->queue->queue_lock); + bfq_update_hw_tag(bfqd); + + BUG_ON(!bfqd->rq_in_driver); + BUG_ON(!bfqq->dispatched); + bfqd->rq_in_driver--; + bfqq->dispatched--; + bfqg_stats_update_completion(bfqq_group(bfqq), + rq_start_time_ns(rq), + rq_io_start_time_ns(rq), + rq->cmd_flags); + + if (!bfqq->dispatched && !bfq_bfqq_busy(bfqq)) { + BUG_ON(!RB_EMPTY_ROOT(&bfqq->sort_list)); + /* + * Set budget_timeout (which we overload to store the + * time at which the queue remains with no backlog and + * no outstanding request; used by the weight-raising + * mechanism). + */ + bfqq->budget_timeout = jiffies; + + bfq_weights_tree_remove(bfqd, &bfqq->entity, + &bfqd->queue_weights_tree); + } + + now_ns = ktime_get_ns(); + + RQ_BIC(rq)->ttime.last_end_request = now_ns; + + /* + * Using us instead of ns, to get a reasonable precision in + * computing rate in next check. + */ + delta_us = div_u64(now_ns - bfqd->last_completion, NSEC_PER_USEC); + + bfq_log(bfqd, "rq_completed: delta %uus/%luus max_size %u rate %llu/%llu", + delta_us, BFQ_MIN_TT/NSEC_PER_USEC, bfqd->last_rq_max_size, + (USEC_PER_SEC* + (u64)((bfqd->last_rq_max_size<>BFQ_RATE_SHIFT, + (USEC_PER_SEC*(u64)(1UL<<(BFQ_RATE_SHIFT-10)))>>BFQ_RATE_SHIFT); + + /* + * If the request took rather long to complete, and, according + * to the maximum request size recorded, this completion latency + * implies that the request was certainly served at a very low + * rate (less than 1M sectors/sec), then the whole observation + * interval that lasts up to this time instant cannot be a + * valid time interval for computing a new peak rate. Invoke + * bfq_update_rate_reset to have the following three steps + * taken: + * - close the observation interval at the last (previous) + * request dispatch or completion + * - compute rate, if possible, for that observation interval + * - reset to zero samples, which will trigger a proper + * re-initialization of the observation interval on next + * dispatch + */ + if (delta_us > BFQ_MIN_TT/NSEC_PER_USEC && + (bfqd->last_rq_max_size<last_completion = now_ns; + + /* + * If we are waiting to discover whether the request pattern + * of the task associated with the queue is actually + * isochronous, and both requisites for this condition to hold + * are now satisfied, then compute soft_rt_next_start (see the + * comments on the function bfq_bfqq_softrt_next_start()). We + * schedule this delayed check when bfqq expires, if it still + * has in-flight requests. + */ + if (bfq_bfqq_softrt_update(bfqq) && bfqq->dispatched == 0 && + RB_EMPTY_ROOT(&bfqq->sort_list)) + bfqq->soft_rt_next_start = + bfq_bfqq_softrt_next_start(bfqd, bfqq); + + /* + * If this is the in-service queue, check if it needs to be expired, + * or if we want to idle in case it has no pending requests. + */ + if (bfqd->in_service_queue == bfqq) { + if (bfqq->dispatched == 0 && bfq_bfqq_must_idle(bfqq)) { + bfq_arm_slice_timer(bfqd); + goto out; + } else if (bfq_may_expire_for_budg_timeout(bfqq)) + bfq_bfqq_expire(bfqd, bfqq, false, + BFQ_BFQQ_BUDGET_TIMEOUT); + else if (RB_EMPTY_ROOT(&bfqq->sort_list) && + (bfqq->dispatched == 0 || + !bfq_bfqq_may_idle(bfqq))) + bfq_bfqq_expire(bfqd, bfqq, false, + BFQ_BFQQ_NO_MORE_REQUESTS); + } + + if (!bfqd->rq_in_driver) + bfq_schedule_dispatch(bfqd); + +out: + return; +} + +static int __bfq_may_queue(struct bfq_queue *bfqq) +{ + if (bfq_bfqq_wait_request(bfqq) && bfq_bfqq_must_alloc(bfqq)) { + bfq_clear_bfqq_must_alloc(bfqq); + return ELV_MQUEUE_MUST; + } + + return ELV_MQUEUE_MAY; +} + +static int bfq_may_queue(struct request_queue *q, unsigned int op) +{ + struct bfq_data *bfqd = q->elevator->elevator_data; + struct task_struct *tsk = current; + struct bfq_io_cq *bic; + struct bfq_queue *bfqq; + + /* + * Don't force setup of a queue from here, as a call to may_queue + * does not necessarily imply that a request actually will be + * queued. So just lookup a possibly existing queue, or return + * 'may queue' if that fails. + */ + bic = bfq_bic_lookup(bfqd, tsk->io_context); + if (!bic) + return ELV_MQUEUE_MAY; + + bfqq = bic_to_bfqq(bic, op_is_sync(op)); + if (bfqq) + return __bfq_may_queue(bfqq); + + return ELV_MQUEUE_MAY; +} + +/* + * Queue lock held here. + */ +static void bfq_put_request(struct request *rq) +{ + struct bfq_queue *bfqq = RQ_BFQQ(rq); + + if (bfqq) { + const int rw = rq_data_dir(rq); + + BUG_ON(!bfqq->allocated[rw]); + bfqq->allocated[rw]--; + + rq->elv.priv[0] = NULL; + rq->elv.priv[1] = NULL; + + bfq_log_bfqq(bfqq->bfqd, bfqq, "put_request %p, %d", + bfqq, bfqq->ref); + bfq_put_queue(bfqq); + } +} + +/* + * Returns NULL if a new bfqq should be allocated, or the old bfqq if this + * was the last process referring to that bfqq. + */ +static struct bfq_queue * +bfq_split_bfqq(struct bfq_io_cq *bic, struct bfq_queue *bfqq) +{ + bfq_log_bfqq(bfqq->bfqd, bfqq, "splitting queue"); + + put_io_context(bic->icq.ioc); + + if (bfqq_process_refs(bfqq) == 1) { + bfqq->pid = current->pid; + bfq_clear_bfqq_coop(bfqq); + bfq_clear_bfqq_split_coop(bfqq); + return bfqq; + } + + bic_set_bfqq(bic, NULL, 1); + + bfq_put_cooperator(bfqq); + + bfq_put_queue(bfqq); + return NULL; +} + +/* + * Allocate bfq data structures associated with this request. + */ +static int bfq_set_request(struct request_queue *q, struct request *rq, + struct bio *bio, gfp_t gfp_mask) +{ + struct bfq_data *bfqd = q->elevator->elevator_data; + struct bfq_io_cq *bic = icq_to_bic(rq->elv.icq); + const int rw = rq_data_dir(rq); + const int is_sync = rq_is_sync(rq); + struct bfq_queue *bfqq; + unsigned long flags; + bool bfqq_already_existing = false, split = false; + + spin_lock_irqsave(q->queue_lock, flags); + + if (!bic) + goto queue_fail; + + bfq_check_ioprio_change(bic, bio); + + bfq_bic_update_cgroup(bic, bio); + +new_queue: + bfqq = bic_to_bfqq(bic, is_sync); + if (!bfqq || bfqq == &bfqd->oom_bfqq) { + if (bfqq) + bfq_put_queue(bfqq); + bfqq = bfq_get_queue(bfqd, bio, is_sync, bic); + BUG_ON(!hlist_unhashed(&bfqq->burst_list_node)); + + bic_set_bfqq(bic, bfqq, is_sync); + if (split && is_sync) { + bfq_log_bfqq(bfqd, bfqq, + "set_request: was_in_list %d " + "was_in_large_burst %d " + "large burst in progress %d", + bic->was_in_burst_list, + bic->saved_in_large_burst, + bfqd->large_burst); + + if ((bic->was_in_burst_list && bfqd->large_burst) || + bic->saved_in_large_burst) { + bfq_log_bfqq(bfqd, bfqq, + "set_request: marking in " + "large burst"); + bfq_mark_bfqq_in_large_burst(bfqq); + } else { + bfq_log_bfqq(bfqd, bfqq, + "set_request: clearing in " + "large burst"); + bfq_clear_bfqq_in_large_burst(bfqq); + if (bic->was_in_burst_list) + hlist_add_head(&bfqq->burst_list_node, + &bfqd->burst_list); + } + bfqq->split_time = jiffies; + } + } else { + /* If the queue was seeky for too long, break it apart. */ + if (bfq_bfqq_coop(bfqq) && bfq_bfqq_split_coop(bfqq)) { + bfq_log_bfqq(bfqd, bfqq, "breaking apart bfqq"); + + /* Update bic before losing reference to bfqq */ + if (bfq_bfqq_in_large_burst(bfqq)) + bic->saved_in_large_burst = true; + + bfqq = bfq_split_bfqq(bic, bfqq); + split = true; + if (!bfqq) + goto new_queue; + else + bfqq_already_existing = true; + } + } + + bfqq->allocated[rw]++; + bfqq->ref++; + bfq_log_bfqq(bfqd, bfqq, "set_request: bfqq %p, %d", bfqq, bfqq->ref); + + rq->elv.priv[0] = bic; + rq->elv.priv[1] = bfqq; + + /* + * If a bfq_queue has only one process reference, it is owned + * by only one bfq_io_cq: we can set the bic field of the + * bfq_queue to the address of that structure. Also, if the + * queue has just been split, mark a flag so that the + * information is available to the other scheduler hooks. + */ + if (likely(bfqq != &bfqd->oom_bfqq) && bfqq_process_refs(bfqq) == 1) { + bfqq->bic = bic; + if (split) { + /* + * If the queue has just been split from a shared + * queue, restore the idle window and the possible + * weight raising period. + */ + bfq_bfqq_resume_state(bfqq, bfqd, bic, + bfqq_already_existing); + } + } + + if (unlikely(bfq_bfqq_just_created(bfqq))) + bfq_handle_burst(bfqd, bfqq); + + spin_unlock_irqrestore(q->queue_lock, flags); + + return 0; + +queue_fail: + bfq_schedule_dispatch(bfqd); + spin_unlock_irqrestore(q->queue_lock, flags); + + return 1; +} + +static void bfq_kick_queue(struct work_struct *work) +{ + struct bfq_data *bfqd = + container_of(work, struct bfq_data, unplug_work); + struct request_queue *q = bfqd->queue; + + spin_lock_irq(q->queue_lock); + __blk_run_queue(q); + spin_unlock_irq(q->queue_lock); +} + +/* + * Handler of the expiration of the timer running if the in-service queue + * is idling inside its time slice. + */ +static enum hrtimer_restart bfq_idle_slice_timer(struct hrtimer *timer) +{ + struct bfq_data *bfqd = container_of(timer, struct bfq_data, + idle_slice_timer); + struct bfq_queue *bfqq; + unsigned long flags; + enum bfqq_expiration reason; + + spin_lock_irqsave(bfqd->queue->queue_lock, flags); + + bfqq = bfqd->in_service_queue; + /* + * Theoretical race here: the in-service queue can be NULL or + * different from the queue that was idling if the timer handler + * spins on the queue_lock and a new request arrives for the + * current queue and there is a full dispatch cycle that changes + * the in-service queue. This can hardly happen, but in the worst + * case we just expire a queue too early. + */ + if (bfqq) { + bfq_log_bfqq(bfqd, bfqq, "slice_timer expired"); + bfq_clear_bfqq_wait_request(bfqq); + + if (bfq_bfqq_budget_timeout(bfqq)) + /* + * Also here the queue can be safely expired + * for budget timeout without wasting + * guarantees + */ + reason = BFQ_BFQQ_BUDGET_TIMEOUT; + else if (bfqq->queued[0] == 0 && bfqq->queued[1] == 0) + /* + * The queue may not be empty upon timer expiration, + * because we may not disable the timer when the + * first request of the in-service queue arrives + * during disk idling. + */ + reason = BFQ_BFQQ_TOO_IDLE; + else + goto schedule_dispatch; + + bfq_bfqq_expire(bfqd, bfqq, true, reason); + } + +schedule_dispatch: + bfq_schedule_dispatch(bfqd); + + spin_unlock_irqrestore(bfqd->queue->queue_lock, flags); + return HRTIMER_NORESTART; +} + +static void bfq_shutdown_timer_wq(struct bfq_data *bfqd) +{ + hrtimer_cancel(&bfqd->idle_slice_timer); + cancel_work_sync(&bfqd->unplug_work); +} + +static void __bfq_put_async_bfqq(struct bfq_data *bfqd, + struct bfq_queue **bfqq_ptr) +{ + struct bfq_group *root_group = bfqd->root_group; + struct bfq_queue *bfqq = *bfqq_ptr; + + bfq_log(bfqd, "put_async_bfqq: %p", bfqq); + if (bfqq) { + bfq_bfqq_move(bfqd, bfqq, root_group); + bfq_log_bfqq(bfqd, bfqq, "put_async_bfqq: putting %p, %d", + bfqq, bfqq->ref); + bfq_put_queue(bfqq); + *bfqq_ptr = NULL; + } +} + +/* + * Release all the bfqg references to its async queues. If we are + * deallocating the group these queues may still contain requests, so + * we reparent them to the root cgroup (i.e., the only one that will + * exist for sure until all the requests on a device are gone). + */ +static void bfq_put_async_queues(struct bfq_data *bfqd, struct bfq_group *bfqg) +{ + int i, j; + + for (i = 0; i < 2; i++) + for (j = 0; j < IOPRIO_BE_NR; j++) + __bfq_put_async_bfqq(bfqd, &bfqg->async_bfqq[i][j]); + + __bfq_put_async_bfqq(bfqd, &bfqg->async_idle_bfqq); +} + +static void bfq_exit_queue(struct elevator_queue *e) +{ + struct bfq_data *bfqd = e->elevator_data; + struct request_queue *q = bfqd->queue; + struct bfq_queue *bfqq, *n; + + bfq_shutdown_timer_wq(bfqd); + + spin_lock_irq(q->queue_lock); + + BUG_ON(bfqd->in_service_queue); + list_for_each_entry_safe(bfqq, n, &bfqd->idle_list, bfqq_list) + bfq_deactivate_bfqq(bfqd, bfqq, false, false); + + spin_unlock_irq(q->queue_lock); + + bfq_shutdown_timer_wq(bfqd); + + BUG_ON(hrtimer_active(&bfqd->idle_slice_timer)); + +#ifdef BFQ_GROUP_IOSCHED_ENABLED + blkcg_deactivate_policy(q, &blkcg_policy_bfq); +#else + bfq_put_async_queues(bfqd, bfqd->root_group); + kfree(bfqd->root_group); +#endif + + kfree(bfqd); +} + +static void bfq_init_root_group(struct bfq_group *root_group, + struct bfq_data *bfqd) +{ + int i; + +#ifdef BFQ_GROUP_IOSCHED_ENABLED + root_group->entity.parent = NULL; + root_group->my_entity = NULL; + root_group->bfqd = bfqd; +#endif + root_group->rq_pos_tree = RB_ROOT; + for (i = 0; i < BFQ_IOPRIO_CLASSES; i++) + root_group->sched_data.service_tree[i] = BFQ_SERVICE_TREE_INIT; + root_group->sched_data.bfq_class_idle_last_service = jiffies; +} + +static int bfq_init_queue(struct request_queue *q, struct elevator_type *e) +{ + struct bfq_data *bfqd; + struct elevator_queue *eq; + + eq = elevator_alloc(q, e); + if (!eq) + return -ENOMEM; + + bfqd = kzalloc_node(sizeof(*bfqd), GFP_KERNEL, q->node); + if (!bfqd) { + kobject_put(&eq->kobj); + return -ENOMEM; + } + eq->elevator_data = bfqd; + + /* + * Our fallback bfqq if bfq_find_alloc_queue() runs into OOM issues. + * Grab a permanent reference to it, so that the normal code flow + * will not attempt to free it. + */ + bfq_init_bfqq(bfqd, &bfqd->oom_bfqq, NULL, 1, 0); + bfqd->oom_bfqq.ref++; + bfqd->oom_bfqq.new_ioprio = BFQ_DEFAULT_QUEUE_IOPRIO; + bfqd->oom_bfqq.new_ioprio_class = IOPRIO_CLASS_BE; + bfqd->oom_bfqq.entity.new_weight = + bfq_ioprio_to_weight(bfqd->oom_bfqq.new_ioprio); + + /* oom_bfqq does not participate to bursts */ + bfq_clear_bfqq_just_created(&bfqd->oom_bfqq); + /* + * Trigger weight initialization, according to ioprio, at the + * oom_bfqq's first activation. The oom_bfqq's ioprio and ioprio + * class won't be changed any more. + */ + bfqd->oom_bfqq.entity.prio_changed = 1; + + bfqd->queue = q; + + spin_lock_irq(q->queue_lock); + q->elevator = eq; + spin_unlock_irq(q->queue_lock); + + bfqd->root_group = bfq_create_group_hierarchy(bfqd, q->node); + if (!bfqd->root_group) + goto out_free; + bfq_init_root_group(bfqd->root_group, bfqd); + bfq_init_entity(&bfqd->oom_bfqq.entity, bfqd->root_group); + + hrtimer_init(&bfqd->idle_slice_timer, CLOCK_MONOTONIC, + HRTIMER_MODE_REL); + bfqd->idle_slice_timer.function = bfq_idle_slice_timer; + + bfqd->queue_weights_tree = RB_ROOT; + bfqd->group_weights_tree = RB_ROOT; + + INIT_WORK(&bfqd->unplug_work, bfq_kick_queue); + + INIT_LIST_HEAD(&bfqd->active_list); + INIT_LIST_HEAD(&bfqd->idle_list); + INIT_HLIST_HEAD(&bfqd->burst_list); + + bfqd->hw_tag = -1; + + bfqd->bfq_max_budget = bfq_default_max_budget; + + bfqd->bfq_fifo_expire[0] = bfq_fifo_expire[0]; + bfqd->bfq_fifo_expire[1] = bfq_fifo_expire[1]; + bfqd->bfq_back_max = bfq_back_max; + bfqd->bfq_back_penalty = bfq_back_penalty; + bfqd->bfq_slice_idle = bfq_slice_idle; + bfqd->bfq_timeout = bfq_timeout; + + bfqd->bfq_requests_within_timer = 120; + + bfqd->bfq_large_burst_thresh = 8; + bfqd->bfq_burst_interval = msecs_to_jiffies(180); + + bfqd->low_latency = true; + + /* + * Trade-off between responsiveness and fairness. + */ + bfqd->bfq_wr_coeff = 30; + bfqd->bfq_wr_rt_max_time = msecs_to_jiffies(300); + bfqd->bfq_wr_max_time = 0; + bfqd->bfq_wr_min_idle_time = msecs_to_jiffies(2000); + bfqd->bfq_wr_min_inter_arr_async = msecs_to_jiffies(500); + bfqd->bfq_wr_max_softrt_rate = 7000; /* + * Approximate rate required + * to playback or record a + * high-definition compressed + * video. + */ + bfqd->wr_busy_queues = 0; + + /* + * Begin by assuming, optimistically, that the device is a + * high-speed one, and that its peak rate is equal to 2/3 of + * the highest reference rate. + */ + bfqd->RT_prod = R_fast[blk_queue_nonrot(bfqd->queue)] * + T_fast[blk_queue_nonrot(bfqd->queue)]; + bfqd->peak_rate = R_fast[blk_queue_nonrot(bfqd->queue)] * 2 / 3; + bfqd->device_speed = BFQ_BFQD_FAST; + + return 0; + +out_free: + kfree(bfqd); + kobject_put(&eq->kobj); + return -ENOMEM; +} + +static void bfq_slab_kill(void) +{ + kmem_cache_destroy(bfq_pool); +} + +static int __init bfq_slab_setup(void) +{ + bfq_pool = KMEM_CACHE(bfq_queue, 0); + if (!bfq_pool) + return -ENOMEM; + return 0; +} + +static ssize_t bfq_var_show(unsigned int var, char *page) +{ + return sprintf(page, "%u\n", var); +} + +static ssize_t bfq_var_store(unsigned long *var, const char *page, + size_t count) +{ + unsigned long new_val; + int ret = kstrtoul(page, 10, &new_val); + + if (ret == 0) + *var = new_val; + + return count; +} + +static ssize_t bfq_wr_max_time_show(struct elevator_queue *e, char *page) +{ + struct bfq_data *bfqd = e->elevator_data; + + return sprintf(page, "%d\n", bfqd->bfq_wr_max_time > 0 ? + jiffies_to_msecs(bfqd->bfq_wr_max_time) : + jiffies_to_msecs(bfq_wr_duration(bfqd))); +} + +static ssize_t bfq_weights_show(struct elevator_queue *e, char *page) +{ + struct bfq_queue *bfqq; + struct bfq_data *bfqd = e->elevator_data; + ssize_t num_char = 0; + + num_char += sprintf(page + num_char, "Tot reqs queued %d\n\n", + bfqd->queued); + + spin_lock_irq(bfqd->queue->queue_lock); + + num_char += sprintf(page + num_char, "Active:\n"); + list_for_each_entry(bfqq, &bfqd->active_list, bfqq_list) { + num_char += sprintf(page + num_char, + "pid%d: weight %hu, nr_queued %d %d, ", + bfqq->pid, + bfqq->entity.weight, + bfqq->queued[0], + bfqq->queued[1]); + num_char += sprintf(page + num_char, + "dur %d/%u\n", + jiffies_to_msecs( + jiffies - + bfqq->last_wr_start_finish), + jiffies_to_msecs(bfqq->wr_cur_max_time)); + } + + num_char += sprintf(page + num_char, "Idle:\n"); + list_for_each_entry(bfqq, &bfqd->idle_list, bfqq_list) { + num_char += sprintf(page + num_char, + "pid%d: weight %hu, dur %d/%u\n", + bfqq->pid, + bfqq->entity.weight, + jiffies_to_msecs(jiffies - + bfqq->last_wr_start_finish), + jiffies_to_msecs(bfqq->wr_cur_max_time)); + } + + spin_unlock_irq(bfqd->queue->queue_lock); + + return num_char; +} + +#define SHOW_FUNCTION(__FUNC, __VAR, __CONV) \ +static ssize_t __FUNC(struct elevator_queue *e, char *page) \ +{ \ + struct bfq_data *bfqd = e->elevator_data; \ + u64 __data = __VAR; \ + if (__CONV == 1) \ + __data = jiffies_to_msecs(__data); \ + else if (__CONV == 2) \ + __data = div_u64(__data, NSEC_PER_MSEC); \ + return bfq_var_show(__data, (page)); \ +} +SHOW_FUNCTION(bfq_fifo_expire_sync_show, bfqd->bfq_fifo_expire[1], 2); +SHOW_FUNCTION(bfq_fifo_expire_async_show, bfqd->bfq_fifo_expire[0], 2); +SHOW_FUNCTION(bfq_back_seek_max_show, bfqd->bfq_back_max, 0); +SHOW_FUNCTION(bfq_back_seek_penalty_show, bfqd->bfq_back_penalty, 0); +SHOW_FUNCTION(bfq_slice_idle_show, bfqd->bfq_slice_idle, 2); +SHOW_FUNCTION(bfq_max_budget_show, bfqd->bfq_user_max_budget, 0); +SHOW_FUNCTION(bfq_timeout_sync_show, bfqd->bfq_timeout, 1); +SHOW_FUNCTION(bfq_strict_guarantees_show, bfqd->strict_guarantees, 0); +SHOW_FUNCTION(bfq_low_latency_show, bfqd->low_latency, 0); +SHOW_FUNCTION(bfq_wr_coeff_show, bfqd->bfq_wr_coeff, 0); +SHOW_FUNCTION(bfq_wr_rt_max_time_show, bfqd->bfq_wr_rt_max_time, 1); +SHOW_FUNCTION(bfq_wr_min_idle_time_show, bfqd->bfq_wr_min_idle_time, 1); +SHOW_FUNCTION(bfq_wr_min_inter_arr_async_show, bfqd->bfq_wr_min_inter_arr_async, + 1); +SHOW_FUNCTION(bfq_wr_max_softrt_rate_show, bfqd->bfq_wr_max_softrt_rate, 0); +#undef SHOW_FUNCTION + +#define USEC_SHOW_FUNCTION(__FUNC, __VAR) \ +static ssize_t __FUNC(struct elevator_queue *e, char *page) \ +{ \ + struct bfq_data *bfqd = e->elevator_data; \ + u64 __data = __VAR; \ + __data = div_u64(__data, NSEC_PER_USEC); \ + return bfq_var_show(__data, (page)); \ +} +USEC_SHOW_FUNCTION(bfq_slice_idle_us_show, bfqd->bfq_slice_idle); +#undef USEC_SHOW_FUNCTION + +#define STORE_FUNCTION(__FUNC, __PTR, MIN, MAX, __CONV) \ +static ssize_t \ +__FUNC(struct elevator_queue *e, const char *page, size_t count) \ +{ \ + struct bfq_data *bfqd = e->elevator_data; \ + unsigned long uninitialized_var(__data); \ + int ret = bfq_var_store(&__data, (page), count); \ + if (__data < (MIN)) \ + __data = (MIN); \ + else if (__data > (MAX)) \ + __data = (MAX); \ + if (__CONV == 1) \ + *(__PTR) = msecs_to_jiffies(__data); \ + else if (__CONV == 2) \ + *(__PTR) = (u64)__data * NSEC_PER_MSEC; \ + else \ + *(__PTR) = __data; \ + return ret; \ +} +STORE_FUNCTION(bfq_fifo_expire_sync_store, &bfqd->bfq_fifo_expire[1], 1, + INT_MAX, 2); +STORE_FUNCTION(bfq_fifo_expire_async_store, &bfqd->bfq_fifo_expire[0], 1, + INT_MAX, 2); +STORE_FUNCTION(bfq_back_seek_max_store, &bfqd->bfq_back_max, 0, INT_MAX, 0); +STORE_FUNCTION(bfq_back_seek_penalty_store, &bfqd->bfq_back_penalty, 1, + INT_MAX, 0); +STORE_FUNCTION(bfq_slice_idle_store, &bfqd->bfq_slice_idle, 0, INT_MAX, 2); +STORE_FUNCTION(bfq_wr_coeff_store, &bfqd->bfq_wr_coeff, 1, INT_MAX, 0); +STORE_FUNCTION(bfq_wr_max_time_store, &bfqd->bfq_wr_max_time, 0, INT_MAX, 1); +STORE_FUNCTION(bfq_wr_rt_max_time_store, &bfqd->bfq_wr_rt_max_time, 0, INT_MAX, + 1); +STORE_FUNCTION(bfq_wr_min_idle_time_store, &bfqd->bfq_wr_min_idle_time, 0, + INT_MAX, 1); +STORE_FUNCTION(bfq_wr_min_inter_arr_async_store, + &bfqd->bfq_wr_min_inter_arr_async, 0, INT_MAX, 1); +STORE_FUNCTION(bfq_wr_max_softrt_rate_store, &bfqd->bfq_wr_max_softrt_rate, 0, + INT_MAX, 0); +#undef STORE_FUNCTION + +#define USEC_STORE_FUNCTION(__FUNC, __PTR, MIN, MAX) \ +static ssize_t __FUNC(struct elevator_queue *e, const char *page, size_t count)\ +{ \ + struct bfq_data *bfqd = e->elevator_data; \ + unsigned long uninitialized_var(__data); \ + int ret = bfq_var_store(&__data, (page), count); \ + if (__data < (MIN)) \ + __data = (MIN); \ + else if (__data > (MAX)) \ + __data = (MAX); \ + *(__PTR) = (u64)__data * NSEC_PER_USEC; \ + return ret; \ +} +USEC_STORE_FUNCTION(bfq_slice_idle_us_store, &bfqd->bfq_slice_idle, 0, + UINT_MAX); +#undef USEC_STORE_FUNCTION + +/* do nothing for the moment */ +static ssize_t bfq_weights_store(struct elevator_queue *e, + const char *page, size_t count) +{ + return count; +} + +static ssize_t bfq_max_budget_store(struct elevator_queue *e, + const char *page, size_t count) +{ + struct bfq_data *bfqd = e->elevator_data; + unsigned long uninitialized_var(__data); + int ret = bfq_var_store(&__data, (page), count); + + if (__data == 0) + bfqd->bfq_max_budget = bfq_calc_max_budget(bfqd); + else { + if (__data > INT_MAX) + __data = INT_MAX; + bfqd->bfq_max_budget = __data; + } + + bfqd->bfq_user_max_budget = __data; + + return ret; +} + +/* + * Leaving this name to preserve name compatibility with cfq + * parameters, but this timeout is used for both sync and async. + */ +static ssize_t bfq_timeout_sync_store(struct elevator_queue *e, + const char *page, size_t count) +{ + struct bfq_data *bfqd = e->elevator_data; + unsigned long uninitialized_var(__data); + int ret = bfq_var_store(&__data, (page), count); + + if (__data < 1) + __data = 1; + else if (__data > INT_MAX) + __data = INT_MAX; + + bfqd->bfq_timeout = msecs_to_jiffies(__data); + if (bfqd->bfq_user_max_budget == 0) + bfqd->bfq_max_budget = bfq_calc_max_budget(bfqd); + + return ret; +} + +static ssize_t bfq_strict_guarantees_store(struct elevator_queue *e, + const char *page, size_t count) +{ + struct bfq_data *bfqd = e->elevator_data; + unsigned long uninitialized_var(__data); + int ret = bfq_var_store(&__data, (page), count); + + if (__data > 1) + __data = 1; + if (!bfqd->strict_guarantees && __data == 1 + && bfqd->bfq_slice_idle < 8 * NSEC_PER_MSEC) + bfqd->bfq_slice_idle = 8 * NSEC_PER_MSEC; + + bfqd->strict_guarantees = __data; + + return ret; +} + +static ssize_t bfq_low_latency_store(struct elevator_queue *e, + const char *page, size_t count) +{ + struct bfq_data *bfqd = e->elevator_data; + unsigned long uninitialized_var(__data); + int ret = bfq_var_store(&__data, (page), count); + + if (__data > 1) + __data = 1; + if (__data == 0 && bfqd->low_latency != 0) + bfq_end_wr(bfqd); + bfqd->low_latency = __data; + + return ret; +} + +#define BFQ_ATTR(name) \ + __ATTR(name, S_IRUGO|S_IWUSR, bfq_##name##_show, bfq_##name##_store) + +static struct elv_fs_entry bfq_attrs[] = { + BFQ_ATTR(fifo_expire_sync), + BFQ_ATTR(fifo_expire_async), + BFQ_ATTR(back_seek_max), + BFQ_ATTR(back_seek_penalty), + BFQ_ATTR(slice_idle), + BFQ_ATTR(slice_idle_us), + BFQ_ATTR(max_budget), + BFQ_ATTR(timeout_sync), + BFQ_ATTR(strict_guarantees), + BFQ_ATTR(low_latency), + BFQ_ATTR(wr_coeff), + BFQ_ATTR(wr_max_time), + BFQ_ATTR(wr_rt_max_time), + BFQ_ATTR(wr_min_idle_time), + BFQ_ATTR(wr_min_inter_arr_async), + BFQ_ATTR(wr_max_softrt_rate), + BFQ_ATTR(weights), + __ATTR_NULL +}; + +static struct elevator_type iosched_bfq = { + .ops.sq = { + .elevator_merge_fn = bfq_merge, + .elevator_merged_fn = bfq_merged_request, + .elevator_merge_req_fn = bfq_merged_requests, +#ifdef BFQ_GROUP_IOSCHED_ENABLED + .elevator_bio_merged_fn = bfq_bio_merged, +#endif + .elevator_allow_bio_merge_fn = bfq_allow_bio_merge, + .elevator_allow_rq_merge_fn = bfq_allow_rq_merge, + .elevator_dispatch_fn = bfq_dispatch_requests, + .elevator_add_req_fn = bfq_insert_request, + .elevator_activate_req_fn = bfq_activate_request, + .elevator_deactivate_req_fn = bfq_deactivate_request, + .elevator_completed_req_fn = bfq_completed_request, + .elevator_former_req_fn = elv_rb_former_request, + .elevator_latter_req_fn = elv_rb_latter_request, + .elevator_init_icq_fn = bfq_init_icq, + .elevator_exit_icq_fn = bfq_exit_icq, + .elevator_set_req_fn = bfq_set_request, + .elevator_put_req_fn = bfq_put_request, + .elevator_may_queue_fn = bfq_may_queue, + .elevator_init_fn = bfq_init_queue, + .elevator_exit_fn = bfq_exit_queue, + }, + .icq_size = sizeof(struct bfq_io_cq), + .icq_align = __alignof__(struct bfq_io_cq), + .elevator_attrs = bfq_attrs, + .elevator_name = "bfq-sq", + .elevator_owner = THIS_MODULE, +}; + +#ifdef BFQ_GROUP_IOSCHED_ENABLED +static struct blkcg_policy blkcg_policy_bfq = { + .dfl_cftypes = bfq_blkg_files, + .legacy_cftypes = bfq_blkcg_legacy_files, + + .cpd_alloc_fn = bfq_cpd_alloc, + .cpd_init_fn = bfq_cpd_init, + .cpd_bind_fn = bfq_cpd_init, + .cpd_free_fn = bfq_cpd_free, + + .pd_alloc_fn = bfq_pd_alloc, + .pd_init_fn = bfq_pd_init, + .pd_offline_fn = bfq_pd_offline, + .pd_free_fn = bfq_pd_free, + .pd_reset_stats_fn = bfq_pd_reset_stats, +}; +#endif + +static int __init bfq_init(void) +{ + int ret; + char msg[60] = "BFQ I/O-scheduler: v8r12"; + +#ifdef BFQ_GROUP_IOSCHED_ENABLED + ret = blkcg_policy_register(&blkcg_policy_bfq); + if (ret) + return ret; +#endif + + ret = -ENOMEM; + if (bfq_slab_setup()) + goto err_pol_unreg; + + /* + * Times to load large popular applications for the typical + * systems installed on the reference devices (see the + * comments before the definitions of the next two + * arrays). Actually, we use slightly slower values, as the + * estimated peak rate tends to be smaller than the actual + * peak rate. The reason for this last fact is that estimates + * are computed over much shorter time intervals than the long + * intervals typically used for benchmarking. Why? First, to + * adapt more quickly to variations. Second, because an I/O + * scheduler cannot rely on a peak-rate-evaluation workload to + * be run for a long time. + */ + T_slow[0] = msecs_to_jiffies(3500); /* actually 4 sec */ + T_slow[1] = msecs_to_jiffies(6000); /* actually 6.5 sec */ + T_fast[0] = msecs_to_jiffies(7000); /* actually 8 sec */ + T_fast[1] = msecs_to_jiffies(2500); /* actually 3 sec */ + + /* + * Thresholds that determine the switch between speed classes + * (see the comments before the definition of the array + * device_speed_thresh). These thresholds are biased towards + * transitions to the fast class. This is safer than the + * opposite bias. In fact, a wrong transition to the slow + * class results in short weight-raising periods, because the + * speed of the device then tends to be higher that the + * reference peak rate. On the opposite end, a wrong + * transition to the fast class tends to increase + * weight-raising periods, because of the opposite reason. + */ + device_speed_thresh[0] = (4 * R_slow[0]) / 3; + device_speed_thresh[1] = (4 * R_slow[1]) / 3; + + ret = elv_register(&iosched_bfq); + if (ret) + goto err_pol_unreg; + +#ifdef BFQ_GROUP_IOSCHED_ENABLED + strcat(msg, " (with cgroups support)"); +#endif + pr_info("%s", msg); + + return 0; + +err_pol_unreg: +#ifdef BFQ_GROUP_IOSCHED_ENABLED + blkcg_policy_unregister(&blkcg_policy_bfq); +#endif + return ret; +} + +static void __exit bfq_exit(void) +{ + elv_unregister(&iosched_bfq); +#ifdef BFQ_GROUP_IOSCHED_ENABLED + blkcg_policy_unregister(&blkcg_policy_bfq); +#endif + bfq_slab_kill(); +} + +module_init(bfq_init); +module_exit(bfq_exit); + +MODULE_AUTHOR("Arianna Avanzini, Fabio Checconi, Paolo Valente"); +MODULE_LICENSE("GPL"); diff --git a/block/bfq.h b/block/bfq.h new file mode 100644 index 0000000000000000..15d326f466b73145 --- /dev/null +++ b/block/bfq.h @@ -0,0 +1,989 @@ +/* + * BFQ v8r12 for 4.11.0: data structures and common functions prototypes. + * + * Based on ideas and code from CFQ: + * Copyright (C) 2003 Jens Axboe + * + * Copyright (C) 2008 Fabio Checconi + * Paolo Valente + * + * Copyright (C) 2015 Paolo Valente + * + * Copyright (C) 2017 Paolo Valente + */ + +#ifndef _BFQ_H +#define _BFQ_H + +#include +#include + +/* + * Define an alternative macro to compile cgroups support. This is one + * of the steps needed to let bfq-mq share the files bfq-sched.c and + * bfq-cgroup.c with bfq-sq. For bfq-mq, the macro + * BFQ_GROUP_IOSCHED_ENABLED will be defined as a function of whether + * the configuration option CONFIG_BFQ_MQ_GROUP_IOSCHED, and not + * CONFIG_BFQ_GROUP_IOSCHED, is defined. + */ +#ifdef CONFIG_BFQ_SQ_GROUP_IOSCHED +#define BFQ_GROUP_IOSCHED_ENABLED +#endif + +#define BFQ_IOPRIO_CLASSES 3 +#define BFQ_CL_IDLE_TIMEOUT (HZ/5) + +#define BFQ_MIN_WEIGHT 1 +#define BFQ_MAX_WEIGHT 1000 +#define BFQ_WEIGHT_CONVERSION_COEFF 10 + +#define BFQ_DEFAULT_QUEUE_IOPRIO 4 + +#define BFQ_WEIGHT_LEGACY_DFL 100 +#define BFQ_DEFAULT_GRP_IOPRIO 0 +#define BFQ_DEFAULT_GRP_CLASS IOPRIO_CLASS_BE + +/* + * Soft real-time applications are extremely more latency sensitive + * than interactive ones. Over-raise the weight of the former to + * privilege them against the latter. + */ +#define BFQ_SOFTRT_WEIGHT_FACTOR 100 + +struct bfq_entity; + +/** + * struct bfq_service_tree - per ioprio_class service tree. + * + * Each service tree represents a B-WF2Q+ scheduler on its own. Each + * ioprio_class has its own independent scheduler, and so its own + * bfq_service_tree. All the fields are protected by the queue lock + * of the containing bfqd. + */ +struct bfq_service_tree { + /* tree for active entities (i.e., those backlogged) */ + struct rb_root active; + /* tree for idle entities (i.e., not backlogged, with V <= F_i)*/ + struct rb_root idle; + + struct bfq_entity *first_idle; /* idle entity with minimum F_i */ + struct bfq_entity *last_idle; /* idle entity with maximum F_i */ + + u64 vtime; /* scheduler virtual time */ + /* scheduler weight sum; active and idle entities contribute to it */ + unsigned long wsum; +}; + +/** + * struct bfq_sched_data - multi-class scheduler. + * + * bfq_sched_data is the basic scheduler queue. It supports three + * ioprio_classes, and can be used either as a toplevel queue or as an + * intermediate queue in a hierarchical setup. + * + * The supported ioprio_classes are the same as in CFQ, in descending + * priority order, IOPRIO_CLASS_RT, IOPRIO_CLASS_BE, IOPRIO_CLASS_IDLE. + * Requests from higher priority queues are served before all the + * requests from lower priority queues; among requests of the same + * queue requests are served according to B-WF2Q+. + * + * The schedule is implemented by the service trees, plus the field + * @next_in_service, which points to the entity on the active trees + * that will be served next, if 1) no changes in the schedule occurs + * before the current in-service entity is expired, 2) the in-service + * queue becomes idle when it expires, and 3) if the entity pointed by + * in_service_entity is not a queue, then the in-service child entity + * of the entity pointed by in_service_entity becomes idle on + * expiration. This peculiar definition allows for the following + * optimization, not yet exploited: while a given entity is still in + * service, we already know which is the best candidate for next + * service among the other active entitities in the same parent + * entity. We can then quickly compare the timestamps of the + * in-service entity with those of such best candidate. + * + * All the fields are protected by the queue lock of the containing + * bfqd. + */ +struct bfq_sched_data { + struct bfq_entity *in_service_entity; /* entity in service */ + /* head-of-the-line entity in the scheduler (see comments above) */ + struct bfq_entity *next_in_service; + /* array of service trees, one per ioprio_class */ + struct bfq_service_tree service_tree[BFQ_IOPRIO_CLASSES]; + /* last time CLASS_IDLE was served */ + unsigned long bfq_class_idle_last_service; + +}; + +/** + * struct bfq_weight_counter - counter of the number of all active entities + * with a given weight. + */ +struct bfq_weight_counter { + unsigned int weight; /* weight of the entities this counter refers to */ + unsigned int num_active; /* nr of active entities with this weight */ + /* + * Weights tree member (see bfq_data's @queue_weights_tree and + * @group_weights_tree) + */ + struct rb_node weights_node; +}; + +/** + * struct bfq_entity - schedulable entity. + * + * A bfq_entity is used to represent either a bfq_queue (leaf node in the + * cgroup hierarchy) or a bfq_group into the upper level scheduler. Each + * entity belongs to the sched_data of the parent group in the cgroup + * hierarchy. Non-leaf entities have also their own sched_data, stored + * in @my_sched_data. + * + * Each entity stores independently its priority values; this would + * allow different weights on different devices, but this + * functionality is not exported to userspace by now. Priorities and + * weights are updated lazily, first storing the new values into the + * new_* fields, then setting the @prio_changed flag. As soon as + * there is a transition in the entity state that allows the priority + * update to take place the effective and the requested priority + * values are synchronized. + * + * Unless cgroups are used, the weight value is calculated from the + * ioprio to export the same interface as CFQ. When dealing with + * ``well-behaved'' queues (i.e., queues that do not spend too much + * time to consume their budget and have true sequential behavior, and + * when there are no external factors breaking anticipation) the + * relative weights at each level of the cgroups hierarchy should be + * guaranteed. All the fields are protected by the queue lock of the + * containing bfqd. + */ +struct bfq_entity { + struct rb_node rb_node; /* service_tree member */ + /* pointer to the weight counter associated with this entity */ + struct bfq_weight_counter *weight_counter; + + /* + * Flag, true if the entity is on a tree (either the active or + * the idle one of its service_tree) or is in service. + */ + bool on_st; + + u64 finish; /* B-WF2Q+ finish timestamp (aka F_i) */ + u64 start; /* B-WF2Q+ start timestamp (aka S_i) */ + + /* tree the entity is enqueued into; %NULL if not on a tree */ + struct rb_root *tree; + + /* + * minimum start time of the (active) subtree rooted at this + * entity; used for O(log N) lookups into active trees + */ + u64 min_start; + + /* amount of service received during the last service slot */ + int service; + + /* budget, used also to calculate F_i: F_i = S_i + @budget / @weight */ + int budget; + + unsigned int weight; /* weight of the queue */ + unsigned int new_weight; /* next weight if a change is in progress */ + + /* original weight, used to implement weight boosting */ + unsigned int orig_weight; + + /* parent entity, for hierarchical scheduling */ + struct bfq_entity *parent; + + /* + * For non-leaf nodes in the hierarchy, the associated + * scheduler queue, %NULL on leaf nodes. + */ + struct bfq_sched_data *my_sched_data; + /* the scheduler queue this entity belongs to */ + struct bfq_sched_data *sched_data; + + /* flag, set to request a weight, ioprio or ioprio_class change */ + int prio_changed; +}; + +struct bfq_group; + +/** + * struct bfq_queue - leaf schedulable entity. + * + * A bfq_queue is a leaf request queue; it can be associated with an + * io_context or more, if it is async or shared between cooperating + * processes. @cgroup holds a reference to the cgroup, to be sure that it + * does not disappear while a bfqq still references it (mostly to avoid + * races between request issuing and task migration followed by cgroup + * destruction). + * All the fields are protected by the queue lock of the containing bfqd. + */ +struct bfq_queue { + /* reference counter */ + int ref; + /* parent bfq_data */ + struct bfq_data *bfqd; + + /* current ioprio and ioprio class */ + unsigned short ioprio, ioprio_class; + /* next ioprio and ioprio class if a change is in progress */ + unsigned short new_ioprio, new_ioprio_class; + + /* + * Shared bfq_queue if queue is cooperating with one or more + * other queues. + */ + struct bfq_queue *new_bfqq; + /* request-position tree member (see bfq_group's @rq_pos_tree) */ + struct rb_node pos_node; + /* request-position tree root (see bfq_group's @rq_pos_tree) */ + struct rb_root *pos_root; + + /* sorted list of pending requests */ + struct rb_root sort_list; + /* if fifo isn't expired, next request to serve */ + struct request *next_rq; + /* number of sync and async requests queued */ + int queued[2]; + /* number of sync and async requests currently allocated */ + int allocated[2]; + /* number of pending metadata requests */ + int meta_pending; + /* fifo list of requests in sort_list */ + struct list_head fifo; + + /* entity representing this queue in the scheduler */ + struct bfq_entity entity; + + /* maximum budget allowed from the feedback mechanism */ + int max_budget; + /* budget expiration (in jiffies) */ + unsigned long budget_timeout; + + /* number of requests on the dispatch list or inside driver */ + int dispatched; + + unsigned int flags; /* status flags.*/ + + /* node for active/idle bfqq list inside parent bfqd */ + struct list_head bfqq_list; + + /* bit vector: a 1 for each seeky requests in history */ + u32 seek_history; + + /* node for the device's burst list */ + struct hlist_node burst_list_node; + + /* position of the last request enqueued */ + sector_t last_request_pos; + + /* Number of consecutive pairs of request completion and + * arrival, such that the queue becomes idle after the + * completion, but the next request arrives within an idle + * time slice; used only if the queue's IO_bound flag has been + * cleared. + */ + unsigned int requests_within_timer; + + /* pid of the process owning the queue, used for logging purposes */ + pid_t pid; + + /* + * Pointer to the bfq_io_cq owning the bfq_queue, set to %NULL + * if the queue is shared. + */ + struct bfq_io_cq *bic; + + /* current maximum weight-raising time for this queue */ + unsigned long wr_cur_max_time; + /* + * Minimum time instant such that, only if a new request is + * enqueued after this time instant in an idle @bfq_queue with + * no outstanding requests, then the task associated with the + * queue it is deemed as soft real-time (see the comments on + * the function bfq_bfqq_softrt_next_start()) + */ + unsigned long soft_rt_next_start; + /* + * Start time of the current weight-raising period if + * the @bfq-queue is being weight-raised, otherwise + * finish time of the last weight-raising period. + */ + unsigned long last_wr_start_finish; + /* factor by which the weight of this queue is multiplied */ + unsigned int wr_coeff; + /* + * Time of the last transition of the @bfq_queue from idle to + * backlogged. + */ + unsigned long last_idle_bklogged; + /* + * Cumulative service received from the @bfq_queue since the + * last transition from idle to backlogged. + */ + unsigned long service_from_backlogged; + /* + * Value of wr start time when switching to soft rt + */ + unsigned long wr_start_at_switch_to_srt; + + unsigned long split_time; /* time of last split */ +}; + +/** + * struct bfq_ttime - per process thinktime stats. + */ +struct bfq_ttime { + u64 last_end_request; /* completion time of last request */ + + u64 ttime_total; /* total process thinktime */ + unsigned long ttime_samples; /* number of thinktime samples */ + u64 ttime_mean; /* average process thinktime */ + +}; + +/** + * struct bfq_io_cq - per (request_queue, io_context) structure. + */ +struct bfq_io_cq { + /* associated io_cq structure */ + struct io_cq icq; /* must be the first member */ + /* array of two process queues, the sync and the async */ + struct bfq_queue *bfqq[2]; + /* associated @bfq_ttime struct */ + struct bfq_ttime ttime; + /* per (request_queue, blkcg) ioprio */ + int ioprio; +#ifdef BFQ_GROUP_IOSCHED_ENABLED + uint64_t blkcg_serial_nr; /* the current blkcg serial */ +#endif + + /* + * Snapshot of the has_short_time flag before merging; taken + * to remember its value while the queue is merged, so as to + * be able to restore it in case of split. + */ + bool saved_has_short_ttime; + /* + * Same purpose as the previous two fields for the I/O bound + * classification of a queue. + */ + bool saved_IO_bound; + + /* + * Same purpose as the previous fields for the value of the + * field keeping the queue's belonging to a large burst + */ + bool saved_in_large_burst; + /* + * True if the queue belonged to a burst list before its merge + * with another cooperating queue. + */ + bool was_in_burst_list; + + /* + * Similar to previous fields: save wr information. + */ + unsigned long saved_wr_coeff; + unsigned long saved_last_wr_start_finish; + unsigned long saved_wr_start_at_switch_to_srt; + unsigned int saved_wr_cur_max_time; +}; + +enum bfq_device_speed { + BFQ_BFQD_FAST, + BFQ_BFQD_SLOW, +}; + +/** + * struct bfq_data - per-device data structure. + * + * All the fields are protected by the @queue lock. + */ +struct bfq_data { + /* request queue for the device */ + struct request_queue *queue; + + /* root bfq_group for the device */ + struct bfq_group *root_group; + + /* + * rbtree of weight counters of @bfq_queues, sorted by + * weight. Used to keep track of whether all @bfq_queues have + * the same weight. The tree contains one counter for each + * distinct weight associated to some active and not + * weight-raised @bfq_queue (see the comments to the functions + * bfq_weights_tree_[add|remove] for further details). + */ + struct rb_root queue_weights_tree; + /* + * rbtree of non-queue @bfq_entity weight counters, sorted by + * weight. Used to keep track of whether all @bfq_groups have + * the same weight. The tree contains one counter for each + * distinct weight associated to some active @bfq_group (see + * the comments to the functions bfq_weights_tree_[add|remove] + * for further details). + */ + struct rb_root group_weights_tree; + + /* + * Number of bfq_queues containing requests (including the + * queue in service, even if it is idling). + */ + int busy_queues; + /* number of weight-raised busy @bfq_queues */ + int wr_busy_queues; + /* number of queued requests */ + int queued; + /* number of requests dispatched and waiting for completion */ + int rq_in_driver; + + /* + * Maximum number of requests in driver in the last + * @hw_tag_samples completed requests. + */ + int max_rq_in_driver; + /* number of samples used to calculate hw_tag */ + int hw_tag_samples; + /* flag set to one if the driver is showing a queueing behavior */ + int hw_tag; + + /* number of budgets assigned */ + int budgets_assigned; + + /* + * Timer set when idling (waiting) for the next request from + * the queue in service. + */ + struct hrtimer idle_slice_timer; + /* delayed work to restart dispatching on the request queue */ + struct work_struct unplug_work; + + /* bfq_queue in service */ + struct bfq_queue *in_service_queue; + /* bfq_io_cq (bic) associated with the @in_service_queue */ + struct bfq_io_cq *in_service_bic; + + /* on-disk position of the last served request */ + sector_t last_position; + + /* time of last request completion (ns) */ + u64 last_completion; + + /* time of first rq dispatch in current observation interval (ns) */ + u64 first_dispatch; + /* time of last rq dispatch in current observation interval (ns) */ + u64 last_dispatch; + + /* beginning of the last budget */ + ktime_t last_budget_start; + /* beginning of the last idle slice */ + ktime_t last_idling_start; + + /* number of samples in current observation interval */ + int peak_rate_samples; + /* num of samples of seq dispatches in current observation interval */ + u32 sequential_samples; + /* total num of sectors transferred in current observation interval */ + u64 tot_sectors_dispatched; + /* max rq size seen during current observation interval (sectors) */ + u32 last_rq_max_size; + /* time elapsed from first dispatch in current observ. interval (us) */ + u64 delta_from_first; + /* current estimate of device peak rate */ + u32 peak_rate; + + /* maximum budget allotted to a bfq_queue before rescheduling */ + int bfq_max_budget; + + /* list of all the bfq_queues active on the device */ + struct list_head active_list; + /* list of all the bfq_queues idle on the device */ + struct list_head idle_list; + + /* + * Timeout for async/sync requests; when it fires, requests + * are served in fifo order. + */ + u64 bfq_fifo_expire[2]; + /* weight of backward seeks wrt forward ones */ + unsigned int bfq_back_penalty; + /* maximum allowed backward seek */ + unsigned int bfq_back_max; + /* maximum idling time */ + u32 bfq_slice_idle; + + /* user-configured max budget value (0 for auto-tuning) */ + int bfq_user_max_budget; + /* + * Timeout for bfq_queues to consume their budget; used to + * prevent seeky queues from imposing long latencies to + * sequential or quasi-sequential ones (this also implies that + * seeky queues cannot receive guarantees in the service + * domain; after a timeout they are charged for the time they + * have been in service, to preserve fairness among them, but + * without service-domain guarantees). + */ + unsigned int bfq_timeout; + + /* + * Number of consecutive requests that must be issued within + * the idle time slice to set again idling to a queue which + * was marked as non-I/O-bound (see the definition of the + * IO_bound flag for further details). + */ + unsigned int bfq_requests_within_timer; + + /* + * Force device idling whenever needed to provide accurate + * service guarantees, without caring about throughput + * issues. CAVEAT: this may even increase latencies, in case + * of useless idling for processes that did stop doing I/O. + */ + bool strict_guarantees; + + /* + * Last time at which a queue entered the current burst of + * queues being activated shortly after each other; for more + * details about this and the following parameters related to + * a burst of activations, see the comments on the function + * bfq_handle_burst. + */ + unsigned long last_ins_in_burst; + /* + * Reference time interval used to decide whether a queue has + * been activated shortly after @last_ins_in_burst. + */ + unsigned long bfq_burst_interval; + /* number of queues in the current burst of queue activations */ + int burst_size; + + /* common parent entity for the queues in the burst */ + struct bfq_entity *burst_parent_entity; + /* Maximum burst size above which the current queue-activation + * burst is deemed as 'large'. + */ + unsigned long bfq_large_burst_thresh; + /* true if a large queue-activation burst is in progress */ + bool large_burst; + /* + * Head of the burst list (as for the above fields, more + * details in the comments on the function bfq_handle_burst). + */ + struct hlist_head burst_list; + + /* if set to true, low-latency heuristics are enabled */ + bool low_latency; + /* + * Maximum factor by which the weight of a weight-raised queue + * is multiplied. + */ + unsigned int bfq_wr_coeff; + /* maximum duration of a weight-raising period (jiffies) */ + unsigned int bfq_wr_max_time; + + /* Maximum weight-raising duration for soft real-time processes */ + unsigned int bfq_wr_rt_max_time; + /* + * Minimum idle period after which weight-raising may be + * reactivated for a queue (in jiffies). + */ + unsigned int bfq_wr_min_idle_time; + /* + * Minimum period between request arrivals after which + * weight-raising may be reactivated for an already busy async + * queue (in jiffies). + */ + unsigned long bfq_wr_min_inter_arr_async; + + /* Max service-rate for a soft real-time queue, in sectors/sec */ + unsigned int bfq_wr_max_softrt_rate; + /* + * Cached value of the product R*T, used for computing the + * maximum duration of weight raising automatically. + */ + u64 RT_prod; + /* device-speed class for the low-latency heuristic */ + enum bfq_device_speed device_speed; + + /* fallback dummy bfqq for extreme OOM conditions */ + struct bfq_queue oom_bfqq; +}; + +enum bfqq_state_flags { + BFQ_BFQQ_FLAG_just_created = 0, /* queue just allocated */ + BFQ_BFQQ_FLAG_busy, /* has requests or is in service */ + BFQ_BFQQ_FLAG_wait_request, /* waiting for a request */ + BFQ_BFQQ_FLAG_non_blocking_wait_rq, /* + * waiting for a request + * without idling the device + */ + BFQ_BFQQ_FLAG_must_alloc, /* must be allowed rq alloc */ + BFQ_BFQQ_FLAG_fifo_expire, /* FIFO checked in this slice */ + BFQ_BFQQ_FLAG_has_short_ttime, /* queue has a short think time */ + BFQ_BFQQ_FLAG_sync, /* synchronous queue */ + BFQ_BFQQ_FLAG_IO_bound, /* + * bfqq has timed-out at least once + * having consumed at most 2/10 of + * its budget + */ + BFQ_BFQQ_FLAG_in_large_burst, /* + * bfqq activated in a large burst, + * see comments to bfq_handle_burst. + */ + BFQ_BFQQ_FLAG_softrt_update, /* + * may need softrt-next-start + * update + */ + BFQ_BFQQ_FLAG_coop, /* bfqq is shared */ + BFQ_BFQQ_FLAG_split_coop /* shared bfqq will be split */ +}; + +#define BFQ_BFQQ_FNS(name) \ +static void bfq_mark_bfqq_##name(struct bfq_queue *bfqq) \ +{ \ + (bfqq)->flags |= (1 << BFQ_BFQQ_FLAG_##name); \ +} \ +static void bfq_clear_bfqq_##name(struct bfq_queue *bfqq) \ +{ \ + (bfqq)->flags &= ~(1 << BFQ_BFQQ_FLAG_##name); \ +} \ +static int bfq_bfqq_##name(const struct bfq_queue *bfqq) \ +{ \ + return ((bfqq)->flags & (1 << BFQ_BFQQ_FLAG_##name)) != 0; \ +} + +BFQ_BFQQ_FNS(just_created); +BFQ_BFQQ_FNS(busy); +BFQ_BFQQ_FNS(wait_request); +BFQ_BFQQ_FNS(non_blocking_wait_rq); +BFQ_BFQQ_FNS(must_alloc); +BFQ_BFQQ_FNS(fifo_expire); +BFQ_BFQQ_FNS(has_short_ttime); +BFQ_BFQQ_FNS(sync); +BFQ_BFQQ_FNS(IO_bound); +BFQ_BFQQ_FNS(in_large_burst); +BFQ_BFQQ_FNS(coop); +BFQ_BFQQ_FNS(split_coop); +BFQ_BFQQ_FNS(softrt_update); +#undef BFQ_BFQQ_FNS + +/* Logging facilities. */ +#ifdef CONFIG_BFQ_REDIRECT_TO_CONSOLE + +static const char *checked_dev_name(const struct device *dev) +{ + static const char nodev[] = "nodev"; + + if (dev) + return dev_name(dev); + + return nodev; +} + +#ifdef BFQ_GROUP_IOSCHED_ENABLED +static struct bfq_group *bfqq_group(struct bfq_queue *bfqq); +static struct blkcg_gq *bfqg_to_blkg(struct bfq_group *bfqg); + +#define bfq_log_bfqq(bfqd, bfqq, fmt, args...) do { \ + char __pbuf[128]; \ + \ + assert_spin_locked((bfqd)->queue->queue_lock); \ + blkg_path(bfqg_to_blkg(bfqq_group(bfqq)), __pbuf, sizeof(__pbuf)); \ + pr_crit("%s bfq%d%c %s " fmt "\n", \ + checked_dev_name((bfqd)->queue->backing_dev_info->dev), \ + (bfqq)->pid, \ + bfq_bfqq_sync((bfqq)) ? 'S' : 'A', \ + __pbuf, ##args); \ +} while (0) + +#define bfq_log_bfqg(bfqd, bfqg, fmt, args...) do { \ + char __pbuf[128]; \ + \ + blkg_path(bfqg_to_blkg(bfqg), __pbuf, sizeof(__pbuf)); \ + pr_crit("%s %s " fmt "\n", \ + checked_dev_name((bfqd)->queue->backing_dev_info->dev), \ + __pbuf, ##args); \ +} while (0) + +#else /* BFQ_GROUP_IOSCHED_ENABLED */ + +#define bfq_log_bfqq(bfqd, bfqq, fmt, args...) \ + pr_crit("%s bfq%d%c " fmt "\n", \ + checked_dev_name((bfqd)->queue->backing_dev_info->dev), \ + (bfqq)->pid, bfq_bfqq_sync((bfqq)) ? 'S' : 'A', \ + ##args) +#define bfq_log_bfqg(bfqd, bfqg, fmt, args...) do {} while (0) + +#endif /* BFQ_GROUP_IOSCHED_ENABLED */ + +#define bfq_log(bfqd, fmt, args...) \ + pr_crit("%s bfq " fmt "\n", \ + checked_dev_name((bfqd)->queue->backing_dev_info->dev), \ + ##args) + +#else /* CONFIG_BFQ_REDIRECT_TO_CONSOLE */ + +#if !defined(CONFIG_BLK_DEV_IO_TRACE) + +/* Avoid possible "unused-variable" warning. See commit message. */ + +#define bfq_log_bfqq(bfqd, bfqq, fmt, args...) ((void) (bfqq)) + +#define bfq_log_bfqg(bfqd, bfqg, fmt, args...) ((void) (bfqg)) + +#define bfq_log(bfqd, fmt, args...) do {} while (0) + +#else /* CONFIG_BLK_DEV_IO_TRACE */ + +#include + +#ifdef BFQ_GROUP_IOSCHED_ENABLED +static struct bfq_group *bfqq_group(struct bfq_queue *bfqq); +static struct blkcg_gq *bfqg_to_blkg(struct bfq_group *bfqg); + +#define bfq_log_bfqq(bfqd, bfqq, fmt, args...) do { \ + char __pbuf[128]; \ + \ + assert_spin_locked((bfqd)->queue->queue_lock); \ + blkg_path(bfqg_to_blkg(bfqq_group(bfqq)), __pbuf, sizeof(__pbuf)); \ + blk_add_trace_msg((bfqd)->queue, "bfq%d%c %s " fmt, \ + (bfqq)->pid, \ + bfq_bfqq_sync((bfqq)) ? 'S' : 'A', \ + __pbuf, ##args); \ +} while (0) + +#define bfq_log_bfqg(bfqd, bfqg, fmt, args...) do { \ + char __pbuf[128]; \ + \ + blkg_path(bfqg_to_blkg(bfqg), __pbuf, sizeof(__pbuf)); \ + blk_add_trace_msg((bfqd)->queue, "%s " fmt, __pbuf, ##args); \ +} while (0) + +#else /* BFQ_GROUP_IOSCHED_ENABLED */ + +#define bfq_log_bfqq(bfqd, bfqq, fmt, args...) \ + blk_add_trace_msg((bfqd)->queue, "bfq%d%c " fmt, (bfqq)->pid, \ + bfq_bfqq_sync((bfqq)) ? 'S' : 'A', \ + ##args) +#define bfq_log_bfqg(bfqd, bfqg, fmt, args...) do {} while (0) + +#endif /* BFQ_GROUP_IOSCHED_ENABLED */ + +#define bfq_log(bfqd, fmt, args...) \ + blk_add_trace_msg((bfqd)->queue, "bfq " fmt, ##args) + +#endif /* CONFIG_BLK_DEV_IO_TRACE */ +#endif /* CONFIG_BFQ_REDIRECT_TO_CONSOLE */ + +/* Expiration reasons. */ +enum bfqq_expiration { + BFQ_BFQQ_TOO_IDLE = 0, /* + * queue has been idling for + * too long + */ + BFQ_BFQQ_BUDGET_TIMEOUT, /* budget took too long to be used */ + BFQ_BFQQ_BUDGET_EXHAUSTED, /* budget consumed */ + BFQ_BFQQ_NO_MORE_REQUESTS, /* the queue has no more requests */ + BFQ_BFQQ_PREEMPTED /* preemption in progress */ +}; + + +struct bfqg_stats { +#ifdef BFQ_GROUP_IOSCHED_ENABLED + /* number of ios merged */ + struct blkg_rwstat merged; + /* total time spent on device in ns, may not be accurate w/ queueing */ + struct blkg_rwstat service_time; + /* total time spent waiting in scheduler queue in ns */ + struct blkg_rwstat wait_time; + /* number of IOs queued up */ + struct blkg_rwstat queued; + /* total disk time and nr sectors dispatched by this group */ + struct blkg_stat time; + /* sum of number of ios queued across all samples */ + struct blkg_stat avg_queue_size_sum; + /* count of samples taken for average */ + struct blkg_stat avg_queue_size_samples; + /* how many times this group has been removed from service tree */ + struct blkg_stat dequeue; + /* total time spent waiting for it to be assigned a timeslice. */ + struct blkg_stat group_wait_time; + /* time spent idling for this blkcg_gq */ + struct blkg_stat idle_time; + /* total time with empty current active q with other requests queued */ + struct blkg_stat empty_time; + /* fields after this shouldn't be cleared on stat reset */ + uint64_t start_group_wait_time; + uint64_t start_idle_time; + uint64_t start_empty_time; + uint16_t flags; +#endif +}; + +#ifdef BFQ_GROUP_IOSCHED_ENABLED +/* + * struct bfq_group_data - per-blkcg storage for the blkio subsystem. + * + * @ps: @blkcg_policy_storage that this structure inherits + * @weight: weight of the bfq_group + */ +struct bfq_group_data { + /* must be the first member */ + struct blkcg_policy_data pd; + + unsigned int weight; +}; + +/** + * struct bfq_group - per (device, cgroup) data structure. + * @entity: schedulable entity to insert into the parent group sched_data. + * @sched_data: own sched_data, to contain child entities (they may be + * both bfq_queues and bfq_groups). + * @bfqd: the bfq_data for the device this group acts upon. + * @async_bfqq: array of async queues for all the tasks belonging to + * the group, one queue per ioprio value per ioprio_class, + * except for the idle class that has only one queue. + * @async_idle_bfqq: async queue for the idle class (ioprio is ignored). + * @my_entity: pointer to @entity, %NULL for the toplevel group; used + * to avoid too many special cases during group creation/ + * migration. + * @active_entities: number of active entities belonging to the group; + * unused for the root group. Used to know whether there + * are groups with more than one active @bfq_entity + * (see the comments to the function + * bfq_bfqq_may_idle()). + * @rq_pos_tree: rbtree sorted by next_request position, used when + * determining if two or more queues have interleaving + * requests (see bfq_find_close_cooperator()). + * + * Each (device, cgroup) pair has its own bfq_group, i.e., for each cgroup + * there is a set of bfq_groups, each one collecting the lower-level + * entities belonging to the group that are acting on the same device. + * + * Locking works as follows: + * o @bfqd is protected by the queue lock, RCU is used to access it + * from the readers. + * o All the other fields are protected by the @bfqd queue lock. + */ +struct bfq_group { + /* must be the first member */ + struct blkg_policy_data pd; + + struct bfq_entity entity; + struct bfq_sched_data sched_data; + + void *bfqd; + + struct bfq_queue *async_bfqq[2][IOPRIO_BE_NR]; + struct bfq_queue *async_idle_bfqq; + + struct bfq_entity *my_entity; + + int active_entities; + + struct rb_root rq_pos_tree; + + struct bfqg_stats stats; +}; + +#else +struct bfq_group { + struct bfq_sched_data sched_data; + + struct bfq_queue *async_bfqq[2][IOPRIO_BE_NR]; + struct bfq_queue *async_idle_bfqq; + + struct rb_root rq_pos_tree; +}; +#endif + +static struct bfq_queue *bfq_entity_to_bfqq(struct bfq_entity *entity); + +static unsigned int bfq_class_idx(struct bfq_entity *entity) +{ + struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); + + return bfqq ? bfqq->ioprio_class - 1 : + BFQ_DEFAULT_GRP_CLASS - 1; +} + +static struct bfq_service_tree * +bfq_entity_service_tree(struct bfq_entity *entity) +{ + struct bfq_sched_data *sched_data = entity->sched_data; + struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); + unsigned int idx = bfq_class_idx(entity); + + BUG_ON(idx >= BFQ_IOPRIO_CLASSES); + BUG_ON(sched_data == NULL); + + if (bfqq) + bfq_log_bfqq(bfqq->bfqd, bfqq, + "entity_service_tree %p %d", + sched_data->service_tree + idx, idx); +#ifdef BFQ_GROUP_IOSCHED_ENABLED + else { + struct bfq_group *bfqg = + container_of(entity, struct bfq_group, entity); + + bfq_log_bfqg((struct bfq_data *)bfqg->bfqd, bfqg, + "entity_service_tree %p %d", + sched_data->service_tree + idx, idx); + } +#endif + return sched_data->service_tree + idx; +} + +static struct bfq_queue *bic_to_bfqq(struct bfq_io_cq *bic, bool is_sync) +{ + return bic->bfqq[is_sync]; +} + +static void bic_set_bfqq(struct bfq_io_cq *bic, struct bfq_queue *bfqq, + bool is_sync) +{ + bic->bfqq[is_sync] = bfqq; +} + +static struct bfq_data *bic_to_bfqd(struct bfq_io_cq *bic) +{ + return bic->icq.q->elevator->elevator_data; +} + +#ifdef BFQ_GROUP_IOSCHED_ENABLED + +static struct bfq_group *bfq_bfqq_to_bfqg(struct bfq_queue *bfqq) +{ + struct bfq_entity *group_entity = bfqq->entity.parent; + + if (!group_entity) + group_entity = &bfqq->bfqd->root_group->entity; + + return container_of(group_entity, struct bfq_group, entity); +} + +#else + +static struct bfq_group *bfq_bfqq_to_bfqg(struct bfq_queue *bfqq) +{ + return bfqq->bfqd->root_group; +} + +#endif + +static void bfq_check_ioprio_change(struct bfq_io_cq *bic, struct bio *bio); +static void bfq_put_queue(struct bfq_queue *bfqq); +static void bfq_dispatch_insert(struct request_queue *q, struct request *rq); +static struct bfq_queue *bfq_get_queue(struct bfq_data *bfqd, + struct bio *bio, bool is_sync, + struct bfq_io_cq *bic); +static void bfq_end_wr_async_queues(struct bfq_data *bfqd, + struct bfq_group *bfqg); +#ifdef BFQ_GROUP_IOSCHED_ENABLED +static void bfq_put_async_queues(struct bfq_data *bfqd, struct bfq_group *bfqg); +#endif +static void bfq_exit_bfqq(struct bfq_data *bfqd, struct bfq_queue *bfqq); + +#endif /* _BFQ_H */ diff --git a/block/elevator.c b/block/elevator.c index 4bb2f0c93fa6c09d..32e60249d547a1be 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -229,7 +229,11 @@ int elevator_init(struct request_queue *q, char *name) */ if (q->mq_ops) { if (q->nr_hw_queues == 1) + #if defined(CONFIG_PCK_INTERACTIVE) && defined(CONFIG_IOSCHED_BFQ) + e = elevator_get("bfq", false); + #else e = elevator_get("mq-deadline", false); + #endif if (!e) return 0; } else diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c index 3937acf7e026cdf8..3d35d89f9d95ddee 100644 --- a/drivers/cpufreq/cpufreq_ondemand.c +++ b/drivers/cpufreq/cpufreq_ondemand.c @@ -21,10 +21,18 @@ #include "cpufreq_ondemand.h" /* On-demand governor macros */ -#define DEF_FREQUENCY_UP_THRESHOLD (80) +#if defined(CONFIG_PCK_INTERACTIVE) && defined(CONFIG_SCHED_MUQSS) + #define DEF_FREQUENCY_UP_THRESHOLD (45) + #define MICRO_FREQUENCY_UP_THRESHOLD (45) +#elif defined(CONFIG_PCK_INTERACTIVE) + #define DEF_FREQUENCY_UP_THRESHOLD (80) + #define MICRO_FREQUENCY_UP_THRESHOLD (85) +#else + #define DEF_FREQUENCY_UP_THRESHOLD (80) + #define MICRO_FREQUENCY_UP_THRESHOLD (95) +#endif #define DEF_SAMPLING_DOWN_FACTOR (1) #define MAX_SAMPLING_DOWN_FACTOR (100000) -#define MICRO_FREQUENCY_UP_THRESHOLD (95) #define MICRO_FREQUENCY_MIN_SAMPLE_RATE (10000) #define MIN_FREQUENCY_UP_THRESHOLD (1) #define MAX_FREQUENCY_UP_THRESHOLD (100) diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c index 5af0b7d200bc23ff..f83df7014e9db50b 100644 --- a/drivers/input/mouse/synaptics.c +++ b/drivers/input/mouse/synaptics.c @@ -1315,7 +1315,9 @@ static void set_input_params(struct psmouse *psmouse, /* Clickpads report only left button */ __clear_bit(BTN_RIGHT, dev->keybit); __clear_bit(BTN_MIDDLE, dev->keybit); - } + } else if (SYN_CAP_CLICKPAD2BTN(info->ext_cap_0c) || + SYN_CAP_CLICKPAD2BTN2(info->ext_cap_0c)) + __set_bit(INPUT_PROP_BUTTONPAD, dev->propbit); } static ssize_t synaptics_show_disable_gesture(struct psmouse *psmouse, diff --git a/drivers/input/mouse/synaptics.h b/drivers/input/mouse/synaptics.h index fc00e005c611c2b0..4cfbeec3ae4cbe5b 100644 --- a/drivers/input/mouse/synaptics.h +++ b/drivers/input/mouse/synaptics.h @@ -86,6 +86,7 @@ */ #define SYN_CAP_CLICKPAD(ex0c) ((ex0c) & BIT(20)) /* 1-button ClickPad */ #define SYN_CAP_CLICKPAD2BTN(ex0c) ((ex0c) & BIT(8)) /* 2-button ClickPad */ +#define SYN_CAP_CLICKPAD2BTN2(ex0c) ((ex0c) & BIT(21)) /* 2-button ClickPad */ #define SYN_CAP_MAX_DIMENSIONS(ex0c) ((ex0c) & BIT(17)) #define SYN_CAP_MIN_DIMENSIONS(ex0c) ((ex0c) & BIT(13)) #define SYN_CAP_ADV_GESTURE(ex0c) ((ex0c) & BIT(19)) diff --git a/drivers/macintosh/Kconfig b/drivers/macintosh/Kconfig index 97a420c11eed59b1..c8621e9b2e4ae6f6 100644 --- a/drivers/macintosh/Kconfig +++ b/drivers/macintosh/Kconfig @@ -159,6 +159,13 @@ config INPUT_ADBHID If unsure, say Y. +config ADB_TRACKPAD_ABSOLUTE + bool "Enable absolute mode for adb trackpads" + depends on INPUT_ADBHID + help + Enable absolute mode in adb-base trackpads. This feature adds + compatibility with synaptics Xorg / Xfree drivers. + config MAC_EMUMOUSEBTN tristate "Support for mouse button 2+3 emulation" depends on SYSCTL && INPUT diff --git a/drivers/macintosh/adbhid.c b/drivers/macintosh/adbhid.c index 09d72bb00d12c775..8d23b2763829dff1 100644 --- a/drivers/macintosh/adbhid.c +++ b/drivers/macintosh/adbhid.c @@ -261,6 +261,15 @@ static struct adb_ids buttons_ids; #define ADBMOUSE_MS_A3 8 /* Mouse systems A3 trackball (handler 3) */ #define ADBMOUSE_MACALLY2 9 /* MacAlly 2-button mouse */ +#ifdef CONFIG_ADB_TRACKPAD_ABSOLUTE +#define ABS_XMIN 310 +#define ABS_XMAX 1700 +#define ABS_YMIN 200 +#define ABS_YMAX 1000 +#define ABS_ZMIN 0 +#define ABS_ZMAX 55 +#endif + static void adbhid_keyboard_input(unsigned char *data, int nb, int apoll) { @@ -405,6 +414,9 @@ static void adbhid_mouse_input(unsigned char *data, int nb, int autopoll) { int id = (data[0] >> 4) & 0x0f; +#ifdef CONFIG_ADB_TRACKPAD_ABSOLUTE + int btn = 0; int x_axis = 0; int y_axis = 0; int z_axis = 0; +#endif if (!adbhid[id]) { printk(KERN_ERR "ADB HID on ID %d not yet registered\n", id); @@ -436,66 +448,108 @@ adbhid_mouse_input(unsigned char *data, int nb, int autopoll) high bits of y-axis motion. XY is additional high bits of x-axis motion. + For ADB Absolute motion protocol the data array will contain the + following values: + + BITS COMMENTS + data[0] = dddd 1100 ADB command: Talk, register 0, for device dddd. + data[1] = byyy yyyy Left button and y-axis motion. + data[2] = bxxx xxxx Second button and x-axis motion. + data[3] = 1yyy 1xxx Half bits of y-axis and x-axis motion. + data[4] = 1yyy 1xxx Higher bits of y-axis and x-axis motion. + data[5] = 1zzz 1zzz Higher and lower bits of z-pressure. + MacAlly 2-button mouse protocol. For MacAlly 2-button mouse protocol the data array will contain the following values: BITS COMMENTS data[0] = dddd 1100 ADB command: Talk, register 0, for device dddd. data[1] = bxxx xxxx Left button and x-axis motion. data[2] = byyy yyyy Right button and y-axis motion. data[3] = ???? ???? unknown data[4] = ???? ???? unknown */ /* If it's a trackpad, we alias the second button to the first. NOTE: Apple sends an ADB flush command to the trackpad when the first (the real) button is released. We could do this here using async flush requests. */ switch (adbhid[id]->mouse_kind) { case ADBMOUSE_TRACKPAD: +#ifdef CONFIG_ADB_TRACKPAD_ABSOLUTE + x_axis = (data[2] & 0x7f) | ((data[3] & 0x07) << 7) | + ((data[4] & 0x07) << 10); + y_axis = (data[1] & 0x7f) | ((data[3] & 0x70) << 3) | + ((data[4] & 0x70) << 6); + z_axis = (data[5] & 0x07) | ((data[5] & 0x70) >> 1); + btn = (!(data[1] >> 7)) & 1; +#else data[1] = (data[1] & 0x7f) | ((data[1] & data[2]) & 0x80); data[2] = data[2] | 0x80; +#endif break; case ADBMOUSE_MICROSPEED: data[1] = (data[1] & 0x7f) | ((data[3] & 0x01) << 7); data[2] = (data[2] & 0x7f) | ((data[3] & 0x02) << 6); data[3] = (data[3] & 0x77) | ((data[3] & 0x04) << 5) | (data[3] & 0x08); break; case ADBMOUSE_TRACKBALLPRO: data[1] = (data[1] & 0x7f) | (((data[3] & 0x04) << 5) & ((data[3] & 0x08) << 4)); data[2] = (data[2] & 0x7f) | ((data[3] & 0x01) << 7); data[3] = (data[3] & 0x77) | ((data[3] & 0x02) << 6); break; case ADBMOUSE_MS_A3: data[1] = (data[1] & 0x7f) | ((data[3] & 0x01) << 7); data[2] = (data[2] & 0x7f) | ((data[3] & 0x02) << 6); data[3] = ((data[3] & 0x04) << 5); break; case ADBMOUSE_MACALLY2: data[3] = (data[2] & 0x80) ? 0x80 : 0x00; data[2] |= 0x80; /* Right button is mapped as button 3 */ nb=4; break; } - input_report_key(adbhid[id]->input, BTN_LEFT, !((data[1] >> 7) & 1)); - input_report_key(adbhid[id]->input, BTN_MIDDLE, !((data[2] >> 7) & 1)); +#ifdef CONFIG_ADB_TRACKPAD_ABSOLUTE + if ( adbhid[id]->mouse_kind == ADBMOUSE_TRACKPAD ) { - if (nb >= 4 && adbhid[id]->mouse_kind != ADBMOUSE_TRACKPAD) - input_report_key(adbhid[id]->input, BTN_RIGHT, !((data[3] >> 7) & 1)); + if(z_axis > 30) input_report_key(adbhid[id]->input, BTN_TOUCH, 1); + if(z_axis < 25) input_report_key(adbhid[id]->input, BTN_TOUCH, 0); - input_report_rel(adbhid[id]->input, REL_X, - ((data[2]&0x7f) < 64 ? (data[2]&0x7f) : (data[2]&0x7f)-128 )); - input_report_rel(adbhid[id]->input, REL_Y, - ((data[1]&0x7f) < 64 ? (data[1]&0x7f) : (data[1]&0x7f)-128 )); + if(z_axis > 0){ + input_report_abs(adbhid[id]->input, ABS_X, x_axis); + input_report_abs(adbhid[id]->input, ABS_Y, y_axis); + input_report_key(adbhid[id]->input, BTN_TOOL_FINGER, 1); + input_report_key(adbhid[id]->input, ABS_TOOL_WIDTH, 5); + } else { + input_report_key(adbhid[id]->input, BTN_TOOL_FINGER, 0); + input_report_key(adbhid[id]->input, ABS_TOOL_WIDTH, 0); + } + input_report_abs(adbhid[id]->input, ABS_PRESSURE, z_axis); + input_report_key(adbhid[id]->input, BTN_LEFT, btn); + } else { +#endif + input_report_key(adbhid[id]->input, BTN_LEFT, !((data[1] >> 7) & 1)); + input_report_key(adbhid[id]->input, BTN_MIDDLE, !((data[2] >> 7) & 1)); + + if (nb >= 4 && adbhid[id]->mouse_kind != ADBMOUSE_TRACKPAD) + input_report_key(adbhid[id]->input, BTN_RIGHT, !((data[3] >> 7) & 1)); + + input_report_rel(adbhid[id]->input, REL_X, + ((data[2]&0x7f) < 64 ? (data[2]&0x7f) : (data[2]&0x7f)-128 )); + input_report_rel(adbhid[id]->input, REL_Y, + ((data[1]&0x7f) < 64 ? (data[1]&0x7f) : (data[1]&0x7f)-128 )); +#ifdef CONFIG_ADB_TRACKPAD_ABSOLUTE + } +#endif input_sync(adbhid[id]->input); } @@ -849,6 +903,15 @@ adbhid_input_register(int id, int default_id, int original_handler_id, input_dev->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT); input_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y); +#ifdef CONFIG_ADB_TRACKPAD_ABSOLUTE + set_bit(EV_ABS, input_dev->evbit); + input_set_abs_params(input_dev, ABS_X, ABS_XMIN, ABS_XMAX, 0, 0); + input_set_abs_params(input_dev, ABS_Y, ABS_YMIN, ABS_YMAX, 0, 0); + input_set_abs_params(input_dev, ABS_PRESSURE, ABS_ZMIN, ABS_ZMAX, 0, 0); + set_bit(BTN_TOUCH, input_dev->keybit); + set_bit(BTN_TOOL_FINGER, input_dev->keybit); + set_bit(ABS_TOOL_WIDTH, input_dev->absbit); +#endif break; case ADB_MISC: @@ -1132,7 +1195,11 @@ init_trackpad(int id) r1_buffer[3], r1_buffer[4], r1_buffer[5], +#ifdef CONFIG_ADB_TRACKPAD_ABSOLUTE + 0x00, /* Enable absolute mode */ +#else 0x03, /*r1_buffer[6],*/ +#endif r1_buffer[7]); /* Without this flush, the trackpad may be locked up */ diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index 80b87954f6ddf686..6685d384fb573e83 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -511,9 +511,28 @@ config THINKPAD_ACPI_HOTKEY_POLL If you are not sure, say Y here. The driver enables polling only if it is strictly necessary to do so. +config THINKPAD_EC + tristate + ---help--- + This is a low-level driver for accessing the ThinkPad H8S embedded + controller over the LPC bus (not to be confused with the ACPI Embedded + Controller interface). + +config TP_SMAPI + tristate "ThinkPad SMAPI Support" + select THINKPAD_EC + default n + help + This adds SMAPI support on Lenovo/IBM ThinkPads, for features such + as battery charging control. For more information about this driver + see . + + If you have a Lenovo/IBM ThinkPad laptop, say Y or M here. + config SENSORS_HDAPS tristate "Thinkpad Hard Drive Active Protection System (hdaps)" depends on INPUT + select THINKPAD_EC select INPUT_POLLDEV default n help diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile index 91cec1751461189a..d0f6e81a0338667f 100644 --- a/drivers/platform/x86/Makefile +++ b/drivers/platform/x86/Makefile @@ -28,6 +28,8 @@ obj-$(CONFIG_TC1100_WMI) += tc1100-wmi.o obj-$(CONFIG_SONY_LAPTOP) += sony-laptop.o obj-$(CONFIG_IDEAPAD_LAPTOP) += ideapad-laptop.o obj-$(CONFIG_THINKPAD_ACPI) += thinkpad_acpi.o +obj-$(CONFIG_THINKPAD_EC) += thinkpad_ec.o +obj-$(CONFIG_TP_SMAPI) += tp_smapi.o obj-$(CONFIG_SENSORS_HDAPS) += hdaps.o obj-$(CONFIG_FUJITSU_LAPTOP) += fujitsu-laptop.o obj-$(CONFIG_FUJITSU_TABLET) += fujitsu-tablet.o diff --git a/drivers/platform/x86/hdaps.c b/drivers/platform/x86/hdaps.c index 458e6c948c11e4b6..dadfb99be5f04032 100644 --- a/drivers/platform/x86/hdaps.c +++ b/drivers/platform/x86/hdaps.c @@ -30,611 +30,864 @@ #include #include -#include +#include #include -#include #include #include #include #include -#include +#include +#include +#include -#define HDAPS_LOW_PORT 0x1600 /* first port used by hdaps */ -#define HDAPS_NR_PORTS 0x30 /* number of ports: 0x1600 - 0x162f */ - -#define HDAPS_PORT_STATE 0x1611 /* device state */ -#define HDAPS_PORT_YPOS 0x1612 /* y-axis position */ -#define HDAPS_PORT_XPOS 0x1614 /* x-axis position */ -#define HDAPS_PORT_TEMP1 0x1616 /* device temperature, in Celsius */ -#define HDAPS_PORT_YVAR 0x1617 /* y-axis variance (what is this?) */ -#define HDAPS_PORT_XVAR 0x1619 /* x-axis variance (what is this?) */ -#define HDAPS_PORT_TEMP2 0x161b /* device temperature (again?) */ -#define HDAPS_PORT_UNKNOWN 0x161c /* what is this? */ -#define HDAPS_PORT_KMACT 0x161d /* keyboard or mouse activity */ - -#define STATE_FRESH 0x50 /* accelerometer data is fresh */ +/* Embedded controller accelerometer read command and its result: */ +static const struct thinkpad_ec_row ec_accel_args = + { .mask = 0x0001, .val = {0x11} }; +#define EC_ACCEL_IDX_READOUTS 0x1 /* readouts included in this read */ + /* First readout, if READOUTS>=1: */ +#define EC_ACCEL_IDX_YPOS1 0x2 /* y-axis position word */ +#define EC_ACCEL_IDX_XPOS1 0x4 /* x-axis position word */ +#define EC_ACCEL_IDX_TEMP1 0x6 /* device temperature in Celsius */ + /* Second readout, if READOUTS>=2: */ +#define EC_ACCEL_IDX_XPOS2 0x7 /* y-axis position word */ +#define EC_ACCEL_IDX_YPOS2 0x9 /* x-axis position word */ +#define EC_ACCEL_IDX_TEMP2 0xb /* device temperature in Celsius */ +#define EC_ACCEL_IDX_QUEUED 0xc /* Number of queued readouts left */ +#define EC_ACCEL_IDX_KMACT 0xd /* keyboard or mouse activity */ +#define EC_ACCEL_IDX_RETVAL 0xf /* command return value, good=0x00 */ #define KEYBD_MASK 0x20 /* set if keyboard activity */ #define MOUSE_MASK 0x40 /* set if mouse activity */ -#define KEYBD_ISSET(n) (!! (n & KEYBD_MASK)) /* keyboard used? */ -#define MOUSE_ISSET(n) (!! (n & MOUSE_MASK)) /* mouse used? */ -#define INIT_TIMEOUT_MSECS 4000 /* wait up to 4s for device init ... */ -#define INIT_WAIT_MSECS 200 /* ... in 200ms increments */ +#define READ_TIMEOUT_MSECS 100 /* wait this long for device read */ +#define RETRY_MSECS 3 /* retry delay */ -#define HDAPS_POLL_INTERVAL 50 /* poll for input every 1/20s (50 ms)*/ #define HDAPS_INPUT_FUZZ 4 /* input event threshold */ #define HDAPS_INPUT_FLAT 4 +#define KMACT_REMEMBER_PERIOD (HZ/10) /* keyboard/mouse persistance */ -#define HDAPS_X_AXIS (1 << 0) -#define HDAPS_Y_AXIS (1 << 1) -#define HDAPS_BOTH_AXES (HDAPS_X_AXIS | HDAPS_Y_AXIS) +/* Input IDs */ +#define HDAPS_INPUT_VENDOR PCI_VENDOR_ID_IBM +#define HDAPS_INPUT_PRODUCT 0x5054 /* "TP", shared with thinkpad_acpi */ +#define HDAPS_INPUT_JS_VERSION 0x6801 /* Joystick emulation input device */ +#define HDAPS_INPUT_RAW_VERSION 0x4801 /* Raw accelerometer input device */ +/* Axis orientation. */ +/* The unnatural bit-representation of inversions is for backward + * compatibility with the"invert=1" module parameter. */ +#define HDAPS_ORIENT_INVERT_XY 0x01 /* Invert both X and Y axes. */ +#define HDAPS_ORIENT_INVERT_X 0x02 /* Invert the X axis (uninvert if + * already inverted by INVERT_XY). */ +#define HDAPS_ORIENT_SWAP 0x04 /* Swap the axes. The swap occurs + * before inverting X or Y. */ +#define HDAPS_ORIENT_MAX 0x07 +#define HDAPS_ORIENT_UNDEFINED 0xFF /* Placeholder during initialization */ +#define HDAPS_ORIENT_INVERT_Y (HDAPS_ORIENT_INVERT_XY | HDAPS_ORIENT_INVERT_X) + +static struct timer_list hdaps_timer; static struct platform_device *pdev; -static struct input_polled_dev *hdaps_idev; -static unsigned int hdaps_invert; -static u8 km_activity; -static int rest_x; -static int rest_y; +static struct input_dev *hdaps_idev; /* joystick-like device with fuzz */ +static struct input_dev *hdaps_idev_raw; /* raw hdaps sensor readouts */ +static unsigned int hdaps_invert = HDAPS_ORIENT_UNDEFINED; +static int needs_calibration; -static DEFINE_MUTEX(hdaps_mtx); +/* Configuration: */ +static int sampling_rate = 50; /* Sampling rate */ +static int oversampling_ratio = 5; /* Ratio between our sampling rate and + * EC accelerometer sampling rate */ +static int running_avg_filter_order = 2; /* EC running average filter order */ -/* - * __get_latch - Get the value from a given port. Callers must hold hdaps_mtx. - */ -static inline u8 __get_latch(u16 port) +/* Latest state readout: */ +static int pos_x, pos_y; /* position */ +static int temperature; /* temperature */ +static int stale_readout = 1; /* last read invalid */ +static int rest_x, rest_y; /* calibrated rest position */ + +/* Last time we saw keyboard and mouse activity: */ +static u64 last_keyboard_jiffies = INITIAL_JIFFIES; +static u64 last_mouse_jiffies = INITIAL_JIFFIES; +static u64 last_update_jiffies = INITIAL_JIFFIES; + +/* input device use count */ +static int hdaps_users; +static DEFINE_MUTEX(hdaps_users_mtx); + +/* Some models require an axis transformation to the standard representation */ +static void transform_axes(int *x, int *y) { - return inb(port) & 0xff; -} - -/* - * __check_latch - Check a port latch for a given value. Returns zero if the - * port contains the given value. Callers must hold hdaps_mtx. - */ -static inline int __check_latch(u16 port, u8 val) -{ - if (__get_latch(port) == val) - return 0; - return -EINVAL; -} - -/* - * __wait_latch - Wait up to 100us for a port latch to get a certain value, - * returning zero if the value is obtained. Callers must hold hdaps_mtx. - */ -static int __wait_latch(u16 port, u8 val) -{ - unsigned int i; - - for (i = 0; i < 20; i++) { - if (!__check_latch(port, val)) - return 0; - udelay(5); + if (hdaps_invert & HDAPS_ORIENT_SWAP) { + int z; + z = *x; + *x = *y; + *y = z; } - - return -EIO; -} - -/* - * __device_refresh - request a refresh from the accelerometer. Does not wait - * for refresh to complete. Callers must hold hdaps_mtx. - */ -static void __device_refresh(void) -{ - udelay(200); - if (inb(0x1604) != STATE_FRESH) { - outb(0x11, 0x1610); - outb(0x01, 0x161f); + if (hdaps_invert & HDAPS_ORIENT_INVERT_XY) { + *x = -*x; + *y = -*y; } + if (hdaps_invert & HDAPS_ORIENT_INVERT_X) + *x = -*x; } -/* - * __device_refresh_sync - request a synchronous refresh from the - * accelerometer. We wait for the refresh to complete. Returns zero if - * successful and nonzero on error. Callers must hold hdaps_mtx. +/** + * __hdaps_update - query current state, with locks already acquired + * @fast: if nonzero, do one quick attempt without retries. + * + * Query current accelerometer state and update global state variables. + * Also prefetches the next query. Caller must hold controller lock. */ -static int __device_refresh_sync(void) -{ - __device_refresh(); - return __wait_latch(0x1604, STATE_FRESH); -} - -/* - * __device_complete - indicate to the accelerometer that we are done reading - * data, and then initiate an async refresh. Callers must hold hdaps_mtx. - */ -static inline void __device_complete(void) -{ - inb(0x161f); - inb(0x1604); - __device_refresh(); -} - -/* - * hdaps_readb_one - reads a byte from a single I/O port, placing the value in - * the given pointer. Returns zero on success or a negative error on failure. - * Can sleep. - */ -static int hdaps_readb_one(unsigned int port, u8 *val) +static int __hdaps_update(int fast) { + /* Read data: */ + struct thinkpad_ec_row data; int ret; - mutex_lock(&hdaps_mtx); - - /* do a sync refresh -- we need to be sure that we read fresh data */ - ret = __device_refresh_sync(); + data.mask = (1 << EC_ACCEL_IDX_READOUTS) | (1 << EC_ACCEL_IDX_KMACT) | + (3 << EC_ACCEL_IDX_YPOS1) | (3 << EC_ACCEL_IDX_XPOS1) | + (1 << EC_ACCEL_IDX_TEMP1) | (1 << EC_ACCEL_IDX_RETVAL); + if (fast) + ret = thinkpad_ec_try_read_row(&ec_accel_args, &data); + else + ret = thinkpad_ec_read_row(&ec_accel_args, &data); + thinkpad_ec_prefetch_row(&ec_accel_args); /* Prefetch even if error */ if (ret) - goto out; + return ret; - *val = inb(port); - __device_complete(); - -out: - mutex_unlock(&hdaps_mtx); - return ret; -} - -/* __hdaps_read_pair - internal lockless helper for hdaps_read_pair(). */ -static int __hdaps_read_pair(unsigned int port1, unsigned int port2, - int *x, int *y) -{ - /* do a sync refresh -- we need to be sure that we read fresh data */ - if (__device_refresh_sync()) + /* Check status: */ + if (data.val[EC_ACCEL_IDX_RETVAL] != 0x00) { + pr_warn("read RETVAL=0x%02x\n", + data.val[EC_ACCEL_IDX_RETVAL]); return -EIO; + } - *y = inw(port2); - *x = inw(port1); - km_activity = inb(HDAPS_PORT_KMACT); - __device_complete(); + if (data.val[EC_ACCEL_IDX_READOUTS] < 1) + return -EBUSY; /* no pending readout, try again later */ - /* hdaps_invert is a bitvector to negate the axes */ - if (hdaps_invert & HDAPS_X_AXIS) - *x = -*x; - if (hdaps_invert & HDAPS_Y_AXIS) - *y = -*y; + /* Parse position data: */ + pos_x = *(s16 *)(data.val+EC_ACCEL_IDX_XPOS1); + pos_y = *(s16 *)(data.val+EC_ACCEL_IDX_YPOS1); + transform_axes(&pos_x, &pos_y); + + /* Keyboard and mouse activity status is cleared as soon as it's read, + * so applications will eat each other's events. Thus we remember any + * event for KMACT_REMEMBER_PERIOD jiffies. + */ + if (data.val[EC_ACCEL_IDX_KMACT] & KEYBD_MASK) + last_keyboard_jiffies = get_jiffies_64(); + if (data.val[EC_ACCEL_IDX_KMACT] & MOUSE_MASK) + last_mouse_jiffies = get_jiffies_64(); + + temperature = data.val[EC_ACCEL_IDX_TEMP1]; + + last_update_jiffies = get_jiffies_64(); + stale_readout = 0; + if (needs_calibration) { + rest_x = pos_x; + rest_y = pos_y; + needs_calibration = 0; + } return 0; } -/* - * hdaps_read_pair - reads the values from a pair of ports, placing the values - * in the given pointers. Returns zero on success. Can sleep. +/** + * hdaps_update - acquire locks and query current state + * + * Query current accelerometer state and update global state variables. + * Also prefetches the next query. + * Retries until timeout if the accelerometer is not in ready status (common). + * Does its own locking. */ -static int hdaps_read_pair(unsigned int port1, unsigned int port2, - int *val1, int *val2) +static int hdaps_update(void) { - int ret; + u64 age = get_jiffies_64() - last_update_jiffies; + int total, ret; - mutex_lock(&hdaps_mtx); - ret = __hdaps_read_pair(port1, port2, val1, val2); - mutex_unlock(&hdaps_mtx); + if (!stale_readout && age < (9*HZ)/(10*sampling_rate)) + return 0; /* already updated recently */ + for (total = 0; total < READ_TIMEOUT_MSECS; total += RETRY_MSECS) { + ret = thinkpad_ec_lock(); + if (ret) + return ret; + ret = __hdaps_update(0); + thinkpad_ec_unlock(); + if (!ret) + return 0; + if (ret != -EBUSY) + break; + msleep(RETRY_MSECS); + } return ret; } -/* - * hdaps_device_init - initialize the accelerometer. Returns zero on success - * and negative error code on failure. Can sleep. +/** + * hdaps_set_power - enable or disable power to the accelerometer. + * Returns zero on success and negative error code on failure. Can sleep. */ +static int hdaps_set_power(int on) +{ + struct thinkpad_ec_row args = + { .mask = 0x0003, .val = {0x14, on?0x01:0x00} }; + struct thinkpad_ec_row data = { .mask = 0x8000 }; + int ret = thinkpad_ec_read_row(&args, &data); + if (ret) + return ret; + if (data.val[0xF] != 0x00) + return -EIO; + return 0; +} + +/** + * hdaps_set_ec_config - set accelerometer parameters. + * @ec_rate: embedded controller sampling rate + * @order: embedded controller running average filter order + * (Normally we have @ec_rate = sampling_rate * oversampling_ratio.) + * Returns zero on success and negative error code on failure. Can sleep. + */ +static int hdaps_set_ec_config(int ec_rate, int order) +{ + struct thinkpad_ec_row args = { .mask = 0x000F, + .val = {0x10, (u8)ec_rate, (u8)(ec_rate>>8), order} }; + struct thinkpad_ec_row data = { .mask = 0x8000 }; + int ret = thinkpad_ec_read_row(&args, &data); + pr_debug("setting ec_rate=%d, filter_order=%d\n", ec_rate, order); + if (ret) + return ret; + if (data.val[0xF] == 0x03) { + pr_warn("config param out of range\n"); + return -EINVAL; + } + if (data.val[0xF] == 0x06) { + pr_warn("config change already pending\n"); + return -EBUSY; + } + if (data.val[0xF] != 0x00) { + pr_warn("config change error, ret=%d\n", + data.val[0xF]); + return -EIO; + } + return 0; +} + +/** + * hdaps_get_ec_config - get accelerometer parameters. + * @ec_rate: embedded controller sampling rate + * @order: embedded controller running average filter order + * Returns zero on success and negative error code on failure. Can sleep. + */ +static int hdaps_get_ec_config(int *ec_rate, int *order) +{ + const struct thinkpad_ec_row args = + { .mask = 0x0003, .val = {0x17, 0x82} }; + struct thinkpad_ec_row data = { .mask = 0x801F }; + int ret = thinkpad_ec_read_row(&args, &data); + if (ret) + return ret; + if (data.val[0xF] != 0x00) + return -EIO; + if (!(data.val[0x1] & 0x01)) + return -ENXIO; /* accelerometer polling not enabled */ + if (data.val[0x1] & 0x02) + return -EBUSY; /* config change in progress, retry later */ + *ec_rate = data.val[0x2] | ((int)(data.val[0x3]) << 8); + *order = data.val[0x4]; + return 0; +} + +/** + * hdaps_get_ec_mode - get EC accelerometer mode + * Returns zero on success and negative error code on failure. Can sleep. + */ +static int hdaps_get_ec_mode(u8 *mode) +{ + const struct thinkpad_ec_row args = + { .mask = 0x0001, .val = {0x13} }; + struct thinkpad_ec_row data = { .mask = 0x8002 }; + int ret = thinkpad_ec_read_row(&args, &data); + if (ret) + return ret; + if (data.val[0xF] != 0x00) { + pr_warn("accelerometer not implemented (0x%02x)\n", + data.val[0xF]); + return -EIO; + } + *mode = data.val[0x1]; + return 0; +} + +/** + * hdaps_check_ec - checks something about the EC. + * Follows the clean-room spec for HDAPS; we don't know what it means. + * Returns zero on success and negative error code on failure. Can sleep. + */ +static int hdaps_check_ec(void) +{ + const struct thinkpad_ec_row args = + { .mask = 0x0003, .val = {0x17, 0x81} }; + struct thinkpad_ec_row data = { .mask = 0x800E }; + int ret = thinkpad_ec_read_row(&args, &data); + if (ret) + return ret; + if (!((data.val[0x1] == 0x00 && data.val[0x2] == 0x60) || /* cleanroom spec */ + (data.val[0x1] == 0x01 && data.val[0x2] == 0x00)) || /* seen on T61 */ + data.val[0x3] != 0x00 || data.val[0xF] != 0x00) { + pr_warn("hdaps_check_ec: bad response (0x%x,0x%x,0x%x,0x%x)\n", + data.val[0x1], data.val[0x2], + data.val[0x3], data.val[0xF]); + return -EIO; + } + return 0; +} + +/** + * hdaps_device_init - initialize the accelerometer. + * + * Call several embedded controller functions to test and initialize the + * accelerometer. + * Returns zero on success and negative error code on failure. Can sleep. + */ +#define FAILED_INIT(msg) pr_err("init failed at: %s\n", msg) static int hdaps_device_init(void) { - int total, ret = -ENXIO; + int ret; + u8 mode; - mutex_lock(&hdaps_mtx); + ret = thinkpad_ec_lock(); + if (ret) + return ret; - outb(0x13, 0x1610); - outb(0x01, 0x161f); - if (__wait_latch(0x161f, 0x00)) - goto out; + if (hdaps_get_ec_mode(&mode)) + { FAILED_INIT("hdaps_get_ec_mode failed"); goto bad; } - /* - * Most ThinkPads return 0x01. - * - * Others--namely the R50p, T41p, and T42p--return 0x03. These laptops - * have "inverted" axises. - * - * The 0x02 value occurs when the chip has been previously initialized. - */ - if (__check_latch(0x1611, 0x03) && - __check_latch(0x1611, 0x02) && - __check_latch(0x1611, 0x01)) - goto out; + pr_debug("initial mode latch is 0x%02x\n", mode); + if (mode == 0x00) + { FAILED_INIT("accelerometer not available"); goto bad; } - printk(KERN_DEBUG "hdaps: initial latch check good (0x%02x)\n", - __get_latch(0x1611)); + if (hdaps_check_ec()) + { FAILED_INIT("hdaps_check_ec failed"); goto bad; } - outb(0x17, 0x1610); - outb(0x81, 0x1611); - outb(0x01, 0x161f); - if (__wait_latch(0x161f, 0x00)) - goto out; - if (__wait_latch(0x1611, 0x00)) - goto out; - if (__wait_latch(0x1612, 0x60)) - goto out; - if (__wait_latch(0x1613, 0x00)) - goto out; - outb(0x14, 0x1610); - outb(0x01, 0x1611); - outb(0x01, 0x161f); - if (__wait_latch(0x161f, 0x00)) - goto out; - outb(0x10, 0x1610); - outb(0xc8, 0x1611); - outb(0x00, 0x1612); - outb(0x02, 0x1613); - outb(0x01, 0x161f); - if (__wait_latch(0x161f, 0x00)) - goto out; - if (__device_refresh_sync()) - goto out; - if (__wait_latch(0x1611, 0x00)) - goto out; + if (hdaps_set_power(1)) + { FAILED_INIT("hdaps_set_power failed"); goto bad; } - /* we have done our dance, now let's wait for the applause */ - for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) { - int x, y; + if (hdaps_set_ec_config(sampling_rate*oversampling_ratio, + running_avg_filter_order)) + { FAILED_INIT("hdaps_set_ec_config failed"); goto bad; } - /* a read of the device helps push it into action */ - __hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y); - if (!__wait_latch(0x1611, 0x02)) { - ret = 0; - break; - } + thinkpad_ec_invalidate(); + udelay(200); - msleep(INIT_WAIT_MSECS); - } - -out: - mutex_unlock(&hdaps_mtx); + /* Just prefetch instead of reading, to avoid ~1sec delay on load */ + ret = thinkpad_ec_prefetch_row(&ec_accel_args); + if (ret) + { FAILED_INIT("initial prefetch failed"); goto bad; } + goto good; +bad: + thinkpad_ec_invalidate(); + ret = -ENXIO; +good: + stale_readout = 1; + thinkpad_ec_unlock(); return ret; } +/** + * hdaps_device_shutdown - power off the accelerometer + * Returns nonzero on failure. Can sleep. + */ +static int hdaps_device_shutdown(void) +{ + int ret; + ret = hdaps_set_power(0); + if (ret) { + pr_warn("cannot power off\n"); + return ret; + } + ret = hdaps_set_ec_config(0, 1); + if (ret) + pr_warn("cannot stop EC sampling\n"); + return ret; +} /* Device model stuff */ static int hdaps_probe(struct platform_device *dev) { int ret; ret = hdaps_device_init(); if (ret) return ret; pr_info("device successfully initialized\n"); return 0; } #ifdef CONFIG_PM_SLEEP +static int hdaps_suspend(struct device *dev) +{ + /* Don't do hdaps polls until resume re-initializes the sensor. */ + del_timer_sync(&hdaps_timer); + hdaps_device_shutdown(); /* ignore errors, effect is negligible */ + return 0; +} + static int hdaps_resume(struct device *dev) { - return hdaps_device_init(); + int ret = hdaps_device_init(); + if (ret) + return ret; + + mutex_lock(&hdaps_users_mtx); + if (hdaps_users) + mod_timer(&hdaps_timer, jiffies + HZ/sampling_rate); + mutex_unlock(&hdaps_users_mtx); + return 0; } #endif -static SIMPLE_DEV_PM_OPS(hdaps_pm, NULL, hdaps_resume); +static SIMPLE_DEV_PM_OPS(hdaps_pm, hdaps_suspend, hdaps_resume); static struct platform_driver hdaps_driver = { .probe = hdaps_probe, .driver = { .name = "hdaps", .pm = &hdaps_pm, }, }; -/* - * hdaps_calibrate - Set our "resting" values. Callers must hold hdaps_mtx. +/** + * hdaps_calibrate - set our "resting" values. + * Does its own locking. */ static void hdaps_calibrate(void) { - __hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &rest_x, &rest_y); + needs_calibration = 1; + hdaps_update(); + /* If that fails, the mousedev poll will take care of things later. */ } -static void hdaps_mousedev_poll(struct input_polled_dev *dev) +/* Timer handler for updating the input device. Runs in softirq context, + * so avoid lenghty or blocking operations. + */ +static void hdaps_mousedev_poll(unsigned long unused) { - struct input_dev *input_dev = dev->input; - int x, y; + int ret; - mutex_lock(&hdaps_mtx); + stale_readout = 1; - if (__hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y)) - goto out; + /* Cannot sleep. Try nonblockingly. If we fail, try again later. */ + if (thinkpad_ec_try_lock()) + goto keep_active; - input_report_abs(input_dev, ABS_X, x - rest_x); - input_report_abs(input_dev, ABS_Y, y - rest_y); - input_sync(input_dev); + ret = __hdaps_update(1); /* fast update, we're in softirq context */ + thinkpad_ec_unlock(); + /* Any of "successful", "not yet ready" and "not prefetched"? */ + if (ret != 0 && ret != -EBUSY && ret != -ENODATA) { + pr_err("poll failed, disabling updates\n"); + return; + } -out: - mutex_unlock(&hdaps_mtx); +keep_active: + /* Even if we failed now, pos_x,y may have been updated earlier: */ + input_report_abs(hdaps_idev, ABS_X, pos_x - rest_x); + input_report_abs(hdaps_idev, ABS_Y, pos_y - rest_y); + input_sync(hdaps_idev); + input_report_abs(hdaps_idev_raw, ABS_X, pos_x); + input_report_abs(hdaps_idev_raw, ABS_Y, pos_y); + input_sync(hdaps_idev_raw); + mod_timer(&hdaps_timer, jiffies + HZ/sampling_rate); } /* Sysfs Files */ static ssize_t hdaps_position_show(struct device *dev, struct device_attribute *attr, char *buf) { - int ret, x, y; - - ret = hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y); + int ret = hdaps_update(); if (ret) return ret; - - return sprintf(buf, "(%d,%d)\n", x, y); -} - -static ssize_t hdaps_variance_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - int ret, x, y; - - ret = hdaps_read_pair(HDAPS_PORT_XVAR, HDAPS_PORT_YVAR, &x, &y); - if (ret) - return ret; - - return sprintf(buf, "(%d,%d)\n", x, y); + return sprintf(buf, "(%d,%d)\n", pos_x, pos_y); } static ssize_t hdaps_temp1_show(struct device *dev, struct device_attribute *attr, char *buf) { - u8 uninitialized_var(temp); - int ret; - - ret = hdaps_readb_one(HDAPS_PORT_TEMP1, &temp); + int ret = hdaps_update(); if (ret) return ret; - - return sprintf(buf, "%u\n", temp); -} - -static ssize_t hdaps_temp2_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - u8 uninitialized_var(temp); - int ret; - - ret = hdaps_readb_one(HDAPS_PORT_TEMP2, &temp); - if (ret) - return ret; - - return sprintf(buf, "%u\n", temp); + return sprintf(buf, "%d\n", temperature); } static ssize_t hdaps_keyboard_activity_show(struct device *dev, struct device_attribute *attr, char *buf) { - return sprintf(buf, "%u\n", KEYBD_ISSET(km_activity)); + int ret = hdaps_update(); + if (ret) + return ret; + return sprintf(buf, "%u\n", + get_jiffies_64() < last_keyboard_jiffies + KMACT_REMEMBER_PERIOD); } static ssize_t hdaps_mouse_activity_show(struct device *dev, struct device_attribute *attr, char *buf) { - return sprintf(buf, "%u\n", MOUSE_ISSET(km_activity)); + int ret = hdaps_update(); + if (ret) + return ret; + return sprintf(buf, "%u\n", + get_jiffies_64() < last_mouse_jiffies + KMACT_REMEMBER_PERIOD); } static ssize_t hdaps_calibrate_show(struct device *dev, struct device_attribute *attr, char *buf) { return sprintf(buf, "(%d,%d)\n", rest_x, rest_y); } static ssize_t hdaps_calibrate_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { - mutex_lock(&hdaps_mtx); hdaps_calibrate(); - mutex_unlock(&hdaps_mtx); - return count; } static ssize_t hdaps_invert_show(struct device *dev, struct device_attribute *attr, char *buf) { return sprintf(buf, "%u\n", hdaps_invert); } static ssize_t hdaps_invert_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { int invert; if (sscanf(buf, "%d", &invert) != 1 || - invert < 0 || invert > HDAPS_BOTH_AXES) + invert < 0 || invert > HDAPS_ORIENT_MAX) return -EINVAL; hdaps_invert = invert; hdaps_calibrate(); return count; } +static ssize_t hdaps_sampling_rate_show( + struct device *dev, struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%d\n", sampling_rate); +} + +static ssize_t hdaps_sampling_rate_store( + struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + int rate, ret; + if (sscanf(buf, "%d", &rate) != 1 || rate > HZ || rate <= 0) { + pr_warn("must have 0ident); - return 1; -} - /* hdaps_dmi_match_invert - found an inverted match. */ static int __init hdaps_dmi_match_invert(const struct dmi_system_id *id) { - hdaps_invert = (unsigned long)id->driver_data; - pr_info("inverting axis (%u) readings\n", hdaps_invert); - return hdaps_dmi_match(id); + unsigned int orient = (kernel_ulong_t) id->driver_data; + hdaps_invert = orient; + pr_info("%s detected, setting orientation %u\n", id->ident, orient); + return 1; /* stop enumeration */ } -#define HDAPS_DMI_MATCH_INVERT(vendor, model, axes) { \ +#define HDAPS_DMI_MATCH_INVERT(vendor, model, orient) { \ .ident = vendor " " model, \ .callback = hdaps_dmi_match_invert, \ - .driver_data = (void *)axes, \ + .driver_data = (void *)(orient), \ .matches = { \ DMI_MATCH(DMI_BOARD_VENDOR, vendor), \ DMI_MATCH(DMI_PRODUCT_VERSION, model) \ } \ } -#define HDAPS_DMI_MATCH_NORMAL(vendor, model) \ - HDAPS_DMI_MATCH_INVERT(vendor, model, 0) - -/* Note that HDAPS_DMI_MATCH_NORMAL("ThinkPad T42") would match - "ThinkPad T42p", so the order of the entries matters. - If your ThinkPad is not recognized, please update to latest - BIOS. This is especially the case for some R52 ThinkPads. */ -static struct dmi_system_id __initdata hdaps_whitelist[] = { - HDAPS_DMI_MATCH_INVERT("IBM", "ThinkPad R50p", HDAPS_BOTH_AXES), - HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad R50"), - HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad R51"), - HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad R52"), - HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad R61i", HDAPS_BOTH_AXES), - HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad R61", HDAPS_BOTH_AXES), - HDAPS_DMI_MATCH_INVERT("IBM", "ThinkPad T41p", HDAPS_BOTH_AXES), - HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad T41"), - HDAPS_DMI_MATCH_INVERT("IBM", "ThinkPad T42p", HDAPS_BOTH_AXES), - HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad T42"), - HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad T43"), - HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T400", HDAPS_BOTH_AXES), - HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T60", HDAPS_BOTH_AXES), - HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T61p", HDAPS_BOTH_AXES), - HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T61", HDAPS_BOTH_AXES), - HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad X40"), - HDAPS_DMI_MATCH_INVERT("IBM", "ThinkPad X41", HDAPS_Y_AXIS), - HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X60", HDAPS_BOTH_AXES), - HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X61s", HDAPS_BOTH_AXES), - HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X61", HDAPS_BOTH_AXES), - HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad Z60m"), - HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad Z61m", HDAPS_BOTH_AXES), - HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad Z61p", HDAPS_BOTH_AXES), +/* List of models with abnormal axis configuration. + Note that HDAPS_DMI_MATCH_NORMAL("ThinkPad T42") would match + "ThinkPad T42p", and enumeration stops after first match, + so the order of the entries matters. */ +struct dmi_system_id __initdata hdaps_whitelist[] = { + HDAPS_DMI_MATCH_INVERT("IBM", "ThinkPad R50p", HDAPS_ORIENT_INVERT_XY), + HDAPS_DMI_MATCH_INVERT("IBM", "ThinkPad R60", HDAPS_ORIENT_INVERT_XY), + HDAPS_DMI_MATCH_INVERT("IBM", "ThinkPad T41p", HDAPS_ORIENT_INVERT_XY), + HDAPS_DMI_MATCH_INVERT("IBM", "ThinkPad T42p", HDAPS_ORIENT_INVERT_XY), + HDAPS_DMI_MATCH_INVERT("IBM", "ThinkPad X40", HDAPS_ORIENT_INVERT_Y), + HDAPS_DMI_MATCH_INVERT("IBM", "ThinkPad X41", HDAPS_ORIENT_INVERT_Y), + HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad R60", HDAPS_ORIENT_INVERT_XY), + HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad R61", HDAPS_ORIENT_INVERT_XY), + HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad R400", HDAPS_ORIENT_INVERT_XY), + HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad R500", HDAPS_ORIENT_INVERT_XY), + HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T60", HDAPS_ORIENT_INVERT_XY), + HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T61", HDAPS_ORIENT_INVERT_XY), + HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X60 Tablet", HDAPS_ORIENT_INVERT_Y), + HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X60s", HDAPS_ORIENT_INVERT_Y), + HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X60", HDAPS_ORIENT_SWAP | HDAPS_ORIENT_INVERT_X), + HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X61", HDAPS_ORIENT_SWAP | HDAPS_ORIENT_INVERT_X), + HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T400s", HDAPS_ORIENT_INVERT_X), + HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T400", HDAPS_ORIENT_INVERT_XY), + HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T410s", HDAPS_ORIENT_SWAP), + HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T410", HDAPS_ORIENT_INVERT_XY), + HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T500", HDAPS_ORIENT_INVERT_XY), + HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T510", HDAPS_ORIENT_SWAP | HDAPS_ORIENT_INVERT_X | HDAPS_ORIENT_INVERT_Y), + HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad W510", HDAPS_ORIENT_MAX), + HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad W520", HDAPS_ORIENT_MAX), + HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X200s", HDAPS_ORIENT_SWAP | HDAPS_ORIENT_INVERT_XY), + HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X200", HDAPS_ORIENT_SWAP | HDAPS_ORIENT_INVERT_X | HDAPS_ORIENT_INVERT_Y), + HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X201 Tablet", HDAPS_ORIENT_SWAP | HDAPS_ORIENT_INVERT_XY), + HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X201s", HDAPS_ORIENT_SWAP | HDAPS_ORIENT_INVERT_XY), + HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X201", HDAPS_ORIENT_SWAP | HDAPS_ORIENT_INVERT_X), + HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X220", HDAPS_ORIENT_SWAP), { .ident = NULL } }; static int __init hdaps_init(void) { - struct input_dev *idev; int ret; - if (!dmi_check_system(hdaps_whitelist)) { - pr_warn("supported laptop not found!\n"); - ret = -ENODEV; - goto out; - } - - if (!request_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS, "hdaps")) { - ret = -ENXIO; - goto out; - } + /* Determine axis orientation orientation */ + if (hdaps_invert == HDAPS_ORIENT_UNDEFINED) /* set by module param? */ + if (dmi_check_system(hdaps_whitelist) < 1) /* in whitelist? */ + hdaps_invert = 0; /* default */ + /* Init timer before platform_driver_register, in case of suspend */ + init_timer(&hdaps_timer); + hdaps_timer.function = hdaps_mousedev_poll; ret = platform_driver_register(&hdaps_driver); if (ret) - goto out_region; + goto out; pdev = platform_device_register_simple("hdaps", -1, NULL, 0); if (IS_ERR(pdev)) { ret = PTR_ERR(pdev); goto out_driver; } ret = sysfs_create_group(&pdev->dev.kobj, &hdaps_attribute_group); if (ret) goto out_device; - hdaps_idev = input_allocate_polled_device(); + hdaps_idev = input_allocate_device(); if (!hdaps_idev) { ret = -ENOMEM; goto out_group; } - hdaps_idev->poll = hdaps_mousedev_poll; - hdaps_idev->poll_interval = HDAPS_POLL_INTERVAL; + hdaps_idev_raw = input_allocate_device(); + if (!hdaps_idev_raw) { + ret = -ENOMEM; + goto out_idev_first; + } - /* initial calibrate for the input device */ - hdaps_calibrate(); + /* calibration for the input device (deferred to avoid delay) */ + needs_calibration = 1; - /* initialize the input class */ - idev = hdaps_idev->input; - idev->name = "hdaps"; - idev->phys = "isa1600/input0"; - idev->id.bustype = BUS_ISA; - idev->dev.parent = &pdev->dev; - idev->evbit[0] = BIT_MASK(EV_ABS); - input_set_abs_params(idev, ABS_X, + /* initialize the joystick-like fuzzed input device */ + hdaps_idev->name = "ThinkPad HDAPS joystick emulation"; + hdaps_idev->phys = "hdaps/input0"; + hdaps_idev->id.bustype = BUS_HOST; + hdaps_idev->id.vendor = HDAPS_INPUT_VENDOR; + hdaps_idev->id.product = HDAPS_INPUT_PRODUCT; + hdaps_idev->id.version = HDAPS_INPUT_JS_VERSION; +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25) + hdaps_idev->cdev.dev = &pdev->dev; +#endif + hdaps_idev->evbit[0] = BIT(EV_ABS); + hdaps_idev->open = hdaps_mousedev_open; + hdaps_idev->close = hdaps_mousedev_close; + input_set_abs_params(hdaps_idev, ABS_X, -256, 256, HDAPS_INPUT_FUZZ, HDAPS_INPUT_FLAT); - input_set_abs_params(idev, ABS_Y, + input_set_abs_params(hdaps_idev, ABS_Y, -256, 256, HDAPS_INPUT_FUZZ, HDAPS_INPUT_FLAT); - ret = input_register_polled_device(hdaps_idev); + ret = input_register_device(hdaps_idev); if (ret) goto out_idev; - pr_info("driver successfully loaded\n"); + /* initialize the raw data input device */ + hdaps_idev_raw->name = "ThinkPad HDAPS accelerometer data"; + hdaps_idev_raw->phys = "hdaps/input1"; + hdaps_idev_raw->id.bustype = BUS_HOST; + hdaps_idev_raw->id.vendor = HDAPS_INPUT_VENDOR; + hdaps_idev_raw->id.product = HDAPS_INPUT_PRODUCT; + hdaps_idev_raw->id.version = HDAPS_INPUT_RAW_VERSION; +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25) + hdaps_idev_raw->cdev.dev = &pdev->dev; +#endif + hdaps_idev_raw->evbit[0] = BIT(EV_ABS); + hdaps_idev_raw->open = hdaps_mousedev_open; + hdaps_idev_raw->close = hdaps_mousedev_close; + input_set_abs_params(hdaps_idev_raw, ABS_X, -32768, 32767, 0, 0); + input_set_abs_params(hdaps_idev_raw, ABS_Y, -32768, 32767, 0, 0); + + ret = input_register_device(hdaps_idev_raw); + if (ret) + goto out_idev_reg_first; + + pr_info("driver successfully loaded.\n"); return 0; +out_idev_reg_first: + input_unregister_device(hdaps_idev); out_idev: - input_free_polled_device(hdaps_idev); + input_free_device(hdaps_idev_raw); +out_idev_first: + input_free_device(hdaps_idev); out_group: sysfs_remove_group(&pdev->dev.kobj, &hdaps_attribute_group); out_device: platform_device_unregister(pdev); out_driver: platform_driver_unregister(&hdaps_driver); -out_region: - release_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS); + hdaps_device_shutdown(); out: pr_warn("driver init failed (ret=%d)!\n", ret); return ret; } static void __exit hdaps_exit(void) { - input_unregister_polled_device(hdaps_idev); - input_free_polled_device(hdaps_idev); + input_unregister_device(hdaps_idev_raw); + input_unregister_device(hdaps_idev); + hdaps_device_shutdown(); /* ignore errors, effect is negligible */ sysfs_remove_group(&pdev->dev.kobj, &hdaps_attribute_group); platform_device_unregister(pdev); platform_driver_unregister(&hdaps_driver); - release_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS); pr_info("driver unloaded\n"); } module_init(hdaps_init); module_exit(hdaps_exit); -module_param_named(invert, hdaps_invert, int, 0); -MODULE_PARM_DESC(invert, "invert data along each axis. 1 invert x-axis, " - "2 invert y-axis, 3 invert both axes."); +module_param_named(invert, hdaps_invert, uint, 0); +MODULE_PARM_DESC(invert, "axis orientation code"); MODULE_AUTHOR("Robert Love"); MODULE_DESCRIPTION("IBM Hard Drive Active Protection System (HDAPS) driver"); diff --git a/drivers/platform/x86/thinkpad_ec.c b/drivers/platform/x86/thinkpad_ec.c new file mode 100644 index 0000000000000000..597614bc17e6c70b --- /dev/null +++ b/drivers/platform/x86/thinkpad_ec.c @@ -0,0 +1,513 @@ +/* + * thinkpad_ec.c - ThinkPad embedded controller LPC3 functions + * + * The embedded controller on ThinkPad laptops has a non-standard interface, + * where LPC channel 3 of the H8S EC chip is hooked up to IO ports + * 0x1600-0x161F and implements (a special case of) the H8S LPC protocol. + * The EC LPC interface provides various system management services (currently + * known: battery information and accelerometer readouts). This driver + * provides access and mutual exclusion for the EC interface. +* + * The LPC protocol and terminology are documented here: + * "H8S/2104B Group Hardware Manual", + * http://documentation.renesas.com/eng/products/mpumcu/rej09b0300_2140bhm.pdf + * + * Copyright (C) 2006-2007 Shem Multinymous + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26) + #include +#else + #include +#endif + +#define TP_VERSION "0.42" + +MODULE_AUTHOR("Shem Multinymous"); +MODULE_DESCRIPTION("ThinkPad embedded controller hardware access"); +MODULE_VERSION(TP_VERSION); +MODULE_LICENSE("GPL"); + +/* IO ports used by embedded controller LPC channel 3: */ +#define TPC_BASE_PORT 0x1600 +#define TPC_NUM_PORTS 0x20 +#define TPC_STR3_PORT 0x1604 /* Reads H8S EC register STR3 */ +#define TPC_TWR0_PORT 0x1610 /* Mapped to H8S EC register TWR0MW/SW */ +#define TPC_TWR15_PORT 0x161F /* Mapped to H8S EC register TWR15. */ + /* (and port TPC_TWR0_PORT+i is mapped to H8S reg TWRi for 00x%02x", \ + msg, args->val[0x0], args->val[0xF], code) + +/* State of request prefetching: */ +static u8 prefetch_arg0, prefetch_argF; /* Args of last prefetch */ +static u64 prefetch_jiffies; /* time of prefetch, or: */ +#define TPC_PREFETCH_NONE INITIAL_JIFFIES /* No prefetch */ +#define TPC_PREFETCH_JUNK (INITIAL_JIFFIES+1) /* Ignore prefetch */ + +/* Locking: */ +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37) +static DECLARE_MUTEX(thinkpad_ec_mutex); +#else +static DEFINE_SEMAPHORE(thinkpad_ec_mutex); +#endif + +/* Kludge in case the ACPI DSDT reserves the ports we need. */ +static bool force_io; /* Willing to do IO to ports we couldn't reserve? */ +static int reserved_io; /* Successfully reserved the ports? */ +module_param_named(force_io, force_io, bool, 0600); +MODULE_PARM_DESC(force_io, "Force IO even if region already reserved (0=off, 1=on)"); + +/** + * thinkpad_ec_lock - get lock on the ThinkPad EC + * + * Get exclusive lock for accesing the ThinkPad embedded controller LPC3 + * interface. Returns 0 iff lock acquired. + */ +int thinkpad_ec_lock(void) +{ + int ret; + ret = down_interruptible(&thinkpad_ec_mutex); + return ret; +} +EXPORT_SYMBOL_GPL(thinkpad_ec_lock); + +/** + * thinkpad_ec_try_lock - try getting lock on the ThinkPad EC + * + * Try getting an exclusive lock for accesing the ThinkPad embedded + * controller LPC3. Returns immediately if lock is not available; neither + * blocks nor sleeps. Returns 0 iff lock acquired . + */ +int thinkpad_ec_try_lock(void) +{ + return down_trylock(&thinkpad_ec_mutex); +} +EXPORT_SYMBOL_GPL(thinkpad_ec_try_lock); + +/** + * thinkpad_ec_unlock - release lock on ThinkPad EC + * + * Release a previously acquired exclusive lock on the ThinkPad ebmedded + * controller LPC3 interface. + */ +void thinkpad_ec_unlock(void) +{ + up(&thinkpad_ec_mutex); +} +EXPORT_SYMBOL_GPL(thinkpad_ec_unlock); + +/** + * thinkpad_ec_request_row - tell embedded controller to prepare a row + * @args Input register arguments + * + * Requests a data row by writing to H8S LPC registers TRW0 through TWR15 (or + * a subset thereof) following the protocol prescribed by the "H8S/2104B Group + * Hardware Manual". Does sanity checks via status register STR3. + */ +static int thinkpad_ec_request_row(const struct thinkpad_ec_row *args) +{ + u8 str3; + int i; + + /* EC protocol requires write to TWR0 (function code): */ + if (!(args->mask & 0x0001)) { + printk(KERN_ERR MSG_FMT("bad args->mask=0x%02x", args->mask)); + return -EINVAL; + } + + /* Check initial STR3 status: */ + str3 = inb(TPC_STR3_PORT) & H8S_STR3_MASK; + if (str3 & H8S_STR3_OBF3B) { /* data already pending */ + inb(TPC_TWR15_PORT); /* marks end of previous transaction */ + if (prefetch_jiffies == TPC_PREFETCH_NONE) + printk(KERN_WARNING REQ_FMT( + "EC has result from unrequested transaction", + str3)); + return -EBUSY; /* EC will be ready in a few usecs */ + } else if (str3 == H8S_STR3_SWMF) { /* busy with previous request */ + if (prefetch_jiffies == TPC_PREFETCH_NONE) + printk(KERN_WARNING REQ_FMT( + "EC is busy with unrequested transaction", + str3)); + return -EBUSY; /* data will be pending in a few usecs */ + } else if (str3 != 0x00) { /* unexpected status? */ + printk(KERN_WARNING REQ_FMT("unexpected initial STR3", str3)); + return -EIO; + } + + /* Send TWR0MW: */ + outb(args->val[0], TPC_TWR0_PORT); + str3 = inb(TPC_STR3_PORT) & H8S_STR3_MASK; + if (str3 != H8S_STR3_MWMF) { /* not accepted? */ + printk(KERN_WARNING REQ_FMT("arg0 rejected", str3)); + return -EIO; + } + + /* Send TWR1 through TWR14: */ + for (i = 1; i < TP_CONTROLLER_ROW_LEN-1; i++) + if ((args->mask>>i)&1) + outb(args->val[i], TPC_TWR0_PORT+i); + + /* Send TWR15 (default to 0x01). This marks end of command. */ + outb((args->mask & 0x8000) ? args->val[0xF] : 0x01, TPC_TWR15_PORT); + + /* Wait until EC starts writing its reply (~60ns on average). + * Releasing locks before this happens may cause an EC hang + * due to firmware bug! + */ + for (i = 0; i < TPC_REQUEST_RETRIES; i++) { + str3 = inb(TPC_STR3_PORT) & H8S_STR3_MASK; + if (str3 & H8S_STR3_SWMF) /* EC started replying */ + return 0; + else if (!(str3 & ~(H8S_STR3_IBF3B|H8S_STR3_MWMF))) + /* Normal progress (the EC hasn't seen the request + * yet, or is processing it). Wait it out. */ + ndelay(TPC_REQUEST_NDELAY); + else { /* weird EC status */ + printk(KERN_WARNING + REQ_FMT("bad end STR3", str3)); + return -EIO; + } + } + printk(KERN_WARNING REQ_FMT("EC is mysteriously silent", str3)); + return -EIO; +} + +/** + * thinkpad_ec_read_data - read pre-requested row-data from EC + * @args Input register arguments of pre-requested rows + * @data Output register values + * + * Reads current row data from the controller, assuming it's already + * requested. Follows the H8S spec for register access and status checks. + */ +static int thinkpad_ec_read_data(const struct thinkpad_ec_row *args, + struct thinkpad_ec_row *data) +{ + int i; + u8 str3 = inb(TPC_STR3_PORT) & H8S_STR3_MASK; + /* Once we make a request, STR3 assumes the sequence of values listed + * in the following 'if' as it reads the request and writes its data. + * It takes about a few dozen nanosecs total, with very high variance. + */ + if (str3 == (H8S_STR3_IBF3B|H8S_STR3_MWMF) || + str3 == 0x00 || /* the 0x00 is indistinguishable from idle EC! */ + str3 == H8S_STR3_SWMF) + return -EBUSY; /* not ready yet */ + /* Finally, the EC signals output buffer full: */ + if (str3 != (H8S_STR3_OBF3B|H8S_STR3_SWMF)) { + printk(KERN_WARNING + REQ_FMT("bad initial STR3", str3)); + return -EIO; + } + + /* Read first byte (signals start of read transactions): */ + data->val[0] = inb(TPC_TWR0_PORT); + /* Optionally read 14 more bytes: */ + for (i = 1; i < TP_CONTROLLER_ROW_LEN-1; i++) + if ((data->mask >> i)&1) + data->val[i] = inb(TPC_TWR0_PORT+i); + /* Read last byte from 0x161F (signals end of read transaction): */ + data->val[0xF] = inb(TPC_TWR15_PORT); + + /* Readout still pending? */ + str3 = inb(TPC_STR3_PORT) & H8S_STR3_MASK; + if (str3 & H8S_STR3_OBF3B) + printk(KERN_WARNING + REQ_FMT("OBF3B=1 after read", str3)); + /* If port 0x161F returns 0x80 too often, the EC may lock up. Warn: */ + if (data->val[0xF] == 0x80) + printk(KERN_WARNING + REQ_FMT("0x161F reports error", data->val[0xF])); + return 0; +} + +/** + * thinkpad_ec_is_row_fetched - is the given row currently prefetched? + * + * To keep things simple we compare only the first and last args; + * this suffices for all known cases. + */ +static int thinkpad_ec_is_row_fetched(const struct thinkpad_ec_row *args) +{ + return (prefetch_jiffies != TPC_PREFETCH_NONE) && + (prefetch_jiffies != TPC_PREFETCH_JUNK) && + (prefetch_arg0 == args->val[0]) && + (prefetch_argF == args->val[0xF]) && + (get_jiffies_64() < prefetch_jiffies + TPC_PREFETCH_TIMEOUT); +} + +/** + * thinkpad_ec_read_row - request and read data from ThinkPad EC + * @args Input register arguments + * @data Output register values + * + * Read a data row from the ThinkPad embedded controller LPC3 interface. + * Does fetching and retrying if needed. The row is specified by an + * array of 16 bytes, some of which may be undefined (but the first is + * mandatory). These bytes are given in @args->val[], where @args->val[i] is + * used iff (@args->mask>>i)&1). The resulting row data is stored in + * @data->val[], but is only guaranteed to be valid for indices corresponding + * to set bit in @data->mask. That is, if @data->mask&(1<val[i] is undefined. + * + * Returns -EBUSY on transient error and -EIO on abnormal condition. + * Caller must hold controller lock. + */ +int thinkpad_ec_read_row(const struct thinkpad_ec_row *args, + struct thinkpad_ec_row *data) +{ + int retries, ret; + + if (thinkpad_ec_is_row_fetched(args)) + goto read_row; /* already requested */ + + /* Request the row */ + for (retries = 0; retries < TPC_READ_RETRIES; ++retries) { + ret = thinkpad_ec_request_row(args); + if (!ret) + goto read_row; + if (ret != -EBUSY) + break; + ndelay(TPC_READ_NDELAY); + } + printk(KERN_ERR REQ_FMT("failed requesting row", ret)); + goto out; + +read_row: + /* Read the row's data */ + for (retries = 0; retries < TPC_READ_RETRIES; ++retries) { + ret = thinkpad_ec_read_data(args, data); + if (!ret) + goto out; + if (ret != -EBUSY) + break; + ndelay(TPC_READ_NDELAY); + } + + printk(KERN_ERR REQ_FMT("failed waiting for data", ret)); + +out: + prefetch_jiffies = TPC_PREFETCH_JUNK; + return ret; +} +EXPORT_SYMBOL_GPL(thinkpad_ec_read_row); + +/** + * thinkpad_ec_try_read_row - try reading prefetched data from ThinkPad EC + * @args Input register arguments + * @data Output register values + * + * Try reading a data row from the ThinkPad embedded controller LPC3 + * interface, if this raw was recently prefetched using + * thinkpad_ec_prefetch_row(). Does not fetch, retry or block. + * The parameters have the same meaning as in thinkpad_ec_read_row(). + * + * Returns -EBUSY is data not ready and -ENODATA if row not prefetched. + * Caller must hold controller lock. + */ +int thinkpad_ec_try_read_row(const struct thinkpad_ec_row *args, + struct thinkpad_ec_row *data) +{ + int ret; + if (!thinkpad_ec_is_row_fetched(args)) { + ret = -ENODATA; + } else { + ret = thinkpad_ec_read_data(args, data); + if (!ret) + prefetch_jiffies = TPC_PREFETCH_NONE; /* eaten up */ + } + return ret; +} +EXPORT_SYMBOL_GPL(thinkpad_ec_try_read_row); + +/** + * thinkpad_ec_prefetch_row - prefetch data from ThinkPad EC + * @args Input register arguments + * + * Prefetch a data row from the ThinkPad embedded controller LCP3 + * interface. A subsequent call to thinkpad_ec_read_row() with the + * same arguments will be faster, and a subsequent call to + * thinkpad_ec_try_read_row() stands a good chance of succeeding if + * done neither too soon nor too late. See + * thinkpad_ec_read_row() for the meaning of @args. + * + * Returns -EBUSY on transient error and -EIO on abnormal condition. + * Caller must hold controller lock. + */ +int thinkpad_ec_prefetch_row(const struct thinkpad_ec_row *args) +{ + int ret; + ret = thinkpad_ec_request_row(args); + if (ret) { + prefetch_jiffies = TPC_PREFETCH_JUNK; + } else { + prefetch_jiffies = get_jiffies_64(); + prefetch_arg0 = args->val[0x0]; + prefetch_argF = args->val[0xF]; + } + return ret; +} +EXPORT_SYMBOL_GPL(thinkpad_ec_prefetch_row); + +/** + * thinkpad_ec_invalidate - invalidate prefetched ThinkPad EC data + * + * Invalidate the data prefetched via thinkpad_ec_prefetch_row() from the + * ThinkPad embedded controller LPC3 interface. + * Must be called before unlocking by any code that accesses the controller + * ports directly. + */ +void thinkpad_ec_invalidate(void) +{ + prefetch_jiffies = TPC_PREFETCH_JUNK; +} +EXPORT_SYMBOL_GPL(thinkpad_ec_invalidate); + + +/*** Checking for EC hardware ***/ + +/** + * thinkpad_ec_test - verify the EC is present and follows protocol + * + * Ensure the EC LPC3 channel really works on this machine by making + * an EC request and seeing if the EC follows the documented H8S protocol. + * The requested row just reads battery status, so it should be harmless to + * access it (on a correct EC). + * This test writes to IO ports, so execute only after checking DMI. + */ +static int __init thinkpad_ec_test(void) +{ + int ret; + const struct thinkpad_ec_row args = /* battery 0 basic status */ + { .mask = 0x8001, .val = {0x01,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0x00} }; + struct thinkpad_ec_row data = { .mask = 0x0000 }; + ret = thinkpad_ec_lock(); + if (ret) + return ret; + ret = thinkpad_ec_read_row(&args, &data); + thinkpad_ec_unlock(); + return ret; +} + +/* Search all DMI device names of a given type for a substring */ +static int __init dmi_find_substring(int type, const char *substr) +{ + const struct dmi_device *dev = NULL; + while ((dev = dmi_find_device(type, NULL, dev))) { + if (strstr(dev->name, substr)) + return 1; + } + return 0; +} + +#define TP_DMI_MATCH(vendor,model) { \ + .ident = vendor " " model, \ + .matches = { \ + DMI_MATCH(DMI_BOARD_VENDOR, vendor), \ + DMI_MATCH(DMI_PRODUCT_VERSION, model) \ + } \ +} + +/* Check DMI for existence of ThinkPad embedded controller */ +static int __init check_dmi_for_ec(void) +{ + /* A few old models that have a good EC but don't report it in DMI */ + struct dmi_system_id tp_whitelist[] = { + TP_DMI_MATCH("IBM", "ThinkPad A30"), + TP_DMI_MATCH("IBM", "ThinkPad T23"), + TP_DMI_MATCH("IBM", "ThinkPad X24"), + TP_DMI_MATCH("LENOVO", "ThinkPad"), + { .ident = NULL } + }; + return dmi_find_substring(DMI_DEV_TYPE_OEM_STRING, + "IBM ThinkPad Embedded Controller") || + dmi_check_system(tp_whitelist); +} + +/*** Init and cleanup ***/ + +static int __init thinkpad_ec_init(void) +{ + if (!check_dmi_for_ec()) { + printk(KERN_WARNING + "thinkpad_ec: no ThinkPad embedded controller!\n"); + return -ENODEV; + } + + if (request_region(TPC_BASE_PORT, TPC_NUM_PORTS, "thinkpad_ec")) { + reserved_io = 1; + } else { + printk(KERN_ERR "thinkpad_ec: cannot claim IO ports %#x-%#x... ", + TPC_BASE_PORT, + TPC_BASE_PORT + TPC_NUM_PORTS - 1); + if (force_io) { + printk("forcing use of unreserved IO ports.\n"); + } else { + printk("consider using force_io=1.\n"); + return -ENXIO; + } + } + prefetch_jiffies = TPC_PREFETCH_JUNK; + if (thinkpad_ec_test()) { + printk(KERN_ERR "thinkpad_ec: initial ec test failed\n"); + if (reserved_io) + release_region(TPC_BASE_PORT, TPC_NUM_PORTS); + return -ENXIO; + } + printk(KERN_INFO "thinkpad_ec: thinkpad_ec " TP_VERSION " loaded.\n"); + return 0; +} + +static void __exit thinkpad_ec_exit(void) +{ + if (reserved_io) + release_region(TPC_BASE_PORT, TPC_NUM_PORTS); + printk(KERN_INFO "thinkpad_ec: unloaded.\n"); +} + +module_init(thinkpad_ec_init); +module_exit(thinkpad_ec_exit); diff --git a/drivers/platform/x86/tp_smapi.c b/drivers/platform/x86/tp_smapi.c new file mode 100644 index 0000000000000000..209cb6487e241324 --- /dev/null +++ b/drivers/platform/x86/tp_smapi.c @@ -0,0 +1,1493 @@ +/* + * tp_smapi.c - ThinkPad SMAPI support + * + * This driver exposes some features of the System Management Application + * Program Interface (SMAPI) BIOS found on ThinkPad laptops. It works on + * models in which the SMAPI BIOS runs in SMM and is invoked by writing + * to the APM control port 0xB2. + * It also exposes battery status information, obtained from the ThinkPad + * embedded controller (via the thinkpad_ec module). + * Ancient ThinkPad models use a different interface, supported by the + * "thinkpad" module from "tpctl". + * + * Many of the battery status values obtained from the EC simply mirror + * values provided by the battery's Smart Battery System (SBS) interface, so + * their meaning is defined by the Smart Battery Data Specification (see + * http://sbs-forum.org/specs/sbdat110.pdf). References to this SBS spec + * are given in the code where relevant. + * + * Copyright (C) 2006 Shem Multinymous . + * SMAPI access code based on the mwave driver by Mike Sullivan. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include +#include +#include +#include +#include +#include /* CMOS defines */ +#include +#include +#include +#include +#include +#include + +#define TP_VERSION "0.42" +#define TP_DESC "ThinkPad SMAPI Support" +#define TP_DIR "smapi" + +MODULE_AUTHOR("Shem Multinymous"); +MODULE_DESCRIPTION(TP_DESC); +MODULE_VERSION(TP_VERSION); +MODULE_LICENSE("GPL"); + +static struct platform_device *pdev; + +static int tp_debug; +module_param_named(debug, tp_debug, int, 0600); +MODULE_PARM_DESC(debug, "Debug level (0=off, 1=on)"); + +/* A few macros for printk()ing: */ +#define TPRINTK(level, fmt, args...) \ + dev_printk(level, &(pdev->dev), "%s: " fmt "\n", __func__, ## args) +#define DPRINTK(fmt, args...) \ + do { if (tp_debug) TPRINTK(KERN_DEBUG, fmt, ## args); } while (0) + +/********************************************************************* + * SMAPI interface + */ + +/* SMAPI functions (register BX when making the SMM call). */ +#define SMAPI_GET_INHIBIT_CHARGE 0x2114 +#define SMAPI_SET_INHIBIT_CHARGE 0x2115 +#define SMAPI_GET_THRESH_START 0x2116 +#define SMAPI_SET_THRESH_START 0x2117 +#define SMAPI_GET_FORCE_DISCHARGE 0x2118 +#define SMAPI_SET_FORCE_DISCHARGE 0x2119 +#define SMAPI_GET_THRESH_STOP 0x211a +#define SMAPI_SET_THRESH_STOP 0x211b + +/* SMAPI error codes (see ThinkPad 770 Technical Reference Manual p.83 at + http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=PFAN-3TUQQD */ +#define SMAPI_RETCODE_EOF 0xff +static struct { u8 rc; char *msg; int ret; } smapi_retcode[] = +{ + {0x00, "OK", 0}, + {0x53, "SMAPI function is not available", -ENXIO}, + {0x81, "Invalid parameter", -EINVAL}, + {0x86, "Function is not supported by SMAPI BIOS", -EOPNOTSUPP}, + {0x90, "System error", -EIO}, + {0x91, "System is invalid", -EIO}, + {0x92, "System is busy, -EBUSY"}, + {0xa0, "Device error (disk read error)", -EIO}, + {0xa1, "Device is busy", -EBUSY}, + {0xa2, "Device is not attached", -ENXIO}, + {0xa3, "Device is disbled", -EIO}, + {0xa4, "Request parameter is out of range", -EINVAL}, + {0xa5, "Request parameter is not accepted", -EINVAL}, + {0xa6, "Transient error", -EBUSY}, /* ? */ + {SMAPI_RETCODE_EOF, "Unknown error code", -EIO} +}; + + +#define SMAPI_MAX_RETRIES 10 +#define SMAPI_PORT2 0x4F /* fixed port, meaning unclear */ +static unsigned short smapi_port; /* APM control port, normally 0xB2 */ + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37) +static DECLARE_MUTEX(smapi_mutex); +#else +static DEFINE_SEMAPHORE(smapi_mutex); +#endif + +/** + * find_smapi_port - read SMAPI port from NVRAM + */ +static int __init find_smapi_port(void) +{ + u16 smapi_id = 0; + unsigned short port = 0; + unsigned long flags; + + spin_lock_irqsave(&rtc_lock, flags); + smapi_id = CMOS_READ(0x7C); + smapi_id |= (CMOS_READ(0x7D) << 8); + spin_unlock_irqrestore(&rtc_lock, flags); + + if (smapi_id != 0x5349) { + printk(KERN_ERR "SMAPI not supported (ID=0x%x)\n", smapi_id); + return -ENXIO; + } + spin_lock_irqsave(&rtc_lock, flags); + port = CMOS_READ(0x7E); + port |= (CMOS_READ(0x7F) << 8); + spin_unlock_irqrestore(&rtc_lock, flags); + if (port == 0) { + printk(KERN_ERR "unable to read SMAPI port number\n"); + return -ENXIO; + } + return port; +} + +/** + * smapi_request - make a SMAPI call + * @inEBX, @inECX, @inEDI, @inESI: input registers + * @outEBX, @outECX, @outEDX, @outEDI, @outESI: outputs registers + * @msg: textual error message + * Invokes the SMAPI SMBIOS with the given input and outpu args. + * All outputs are optional (can be %NULL). + * Returns 0 when successful, and a negative errno constant + * (see smapi_retcode above) upon failure. + */ +static int smapi_request(u32 inEBX, u32 inECX, + u32 inEDI, u32 inESI, + u32 *outEBX, u32 *outECX, u32 *outEDX, + u32 *outEDI, u32 *outESI, const char **msg) +{ + int ret = 0; + int i; + int retries; + u8 rc; + /* Must use local vars for output regs, due to reg pressure. */ + u32 tmpEAX, tmpEBX, tmpECX, tmpEDX, tmpEDI, tmpESI; + + for (retries = 0; retries < SMAPI_MAX_RETRIES; ++retries) { + DPRINTK("req_in: BX=%x CX=%x DI=%x SI=%x", + inEBX, inECX, inEDI, inESI); + + /* SMAPI's SMBIOS call and thinkpad_ec end up using use + * different interfaces to the same chip, so play it safe. */ + ret = thinkpad_ec_lock(); + if (ret) + return ret; + + __asm__ __volatile__( + "movl $0x00005380,%%eax\n\t" + "movl %6,%%ebx\n\t" + "movl %7,%%ecx\n\t" + "movl %8,%%edi\n\t" + "movl %9,%%esi\n\t" + "xorl %%edx,%%edx\n\t" + "movw %10,%%dx\n\t" + "out %%al,%%dx\n\t" /* trigger SMI to SMBIOS */ + "out %%al,$0x4F\n\t" + "movl %%eax,%0\n\t" + "movl %%ebx,%1\n\t" + "movl %%ecx,%2\n\t" + "movl %%edx,%3\n\t" + "movl %%edi,%4\n\t" + "movl %%esi,%5\n\t" + :"=m"(tmpEAX), + "=m"(tmpEBX), + "=m"(tmpECX), + "=m"(tmpEDX), + "=m"(tmpEDI), + "=m"(tmpESI) + :"m"(inEBX), "m"(inECX), "m"(inEDI), "m"(inESI), + "m"((u16)smapi_port) + :"%eax", "%ebx", "%ecx", "%edx", "%edi", + "%esi"); + + thinkpad_ec_invalidate(); + thinkpad_ec_unlock(); + + /* Don't let the next SMAPI access happen too quickly, + * may case problems. (We're hold smapi_mutex). */ + msleep(50); + + if (outEBX) *outEBX = tmpEBX; + if (outECX) *outECX = tmpECX; + if (outEDX) *outEDX = tmpEDX; + if (outESI) *outESI = tmpESI; + if (outEDI) *outEDI = tmpEDI; + + /* Look up error code */ + rc = (tmpEAX>>8)&0xFF; + for (i = 0; smapi_retcode[i].rc != SMAPI_RETCODE_EOF && + smapi_retcode[i].rc != rc; ++i) {} + ret = smapi_retcode[i].ret; + if (msg) + *msg = smapi_retcode[i].msg; + + DPRINTK("req_out: AX=%x BX=%x CX=%x DX=%x DI=%x SI=%x r=%d", + tmpEAX, tmpEBX, tmpECX, tmpEDX, tmpEDI, tmpESI, ret); + if (ret) + TPRINTK(KERN_NOTICE, "SMAPI error: %s (func=%x)", + smapi_retcode[i].msg, inEBX); + + if (ret != -EBUSY) + return ret; + } + return ret; +} + +/* Convenience wrapper: discard output arguments */ +static int smapi_write(u32 inEBX, u32 inECX, + u32 inEDI, u32 inESI, const char **msg) +{ + return smapi_request(inEBX, inECX, inEDI, inESI, + NULL, NULL, NULL, NULL, NULL, msg); +} + + +/********************************************************************* + * Specific SMAPI services + * All of these functions return 0 upon success, and a negative errno + * constant (see smapi_retcode) on failure. + */ + +enum thresh_type { + THRESH_STOP = 0, /* the code assumes this is 0 for brevity */ + THRESH_START +}; +#define THRESH_NAME(which) ((which == THRESH_START) ? "start" : "stop") + +/** + * __get_real_thresh - read battery charge start/stop threshold from SMAPI + * @bat: battery number (0 or 1) + * @which: THRESH_START or THRESH_STOP + * @thresh: 1..99, 0=default 1..99, 0=default (pass this as-is to SMAPI) + * @outEDI: some additional state that needs to be preserved, meaning unknown + * @outESI: some additional state that needs to be preserved, meaning unknown + */ +static int __get_real_thresh(int bat, enum thresh_type which, int *thresh, + u32 *outEDI, u32 *outESI) +{ + u32 ebx = (which == THRESH_START) ? SMAPI_GET_THRESH_START + : SMAPI_GET_THRESH_STOP; + u32 ecx = (bat+1)<<8; + const char *msg; + int ret = smapi_request(ebx, ecx, 0, 0, NULL, + &ecx, NULL, outEDI, outESI, &msg); + if (ret) { + TPRINTK(KERN_NOTICE, "cannot get %s_thresh of bat=%d: %s", + THRESH_NAME(which), bat, msg); + return ret; + } + if (!(ecx&0x00000100)) { + TPRINTK(KERN_NOTICE, "cannot get %s_thresh of bat=%d: ecx=0%x", + THRESH_NAME(which), bat, ecx); + return -EIO; + } + if (thresh) + *thresh = ecx&0xFF; + return 0; +} + +/** + * get_real_thresh - read battery charge start/stop threshold from SMAPI + * @bat: battery number (0 or 1) + * @which: THRESH_START or THRESH_STOP + * @thresh: 1..99, 0=default (passes as-is to SMAPI) + */ +static int get_real_thresh(int bat, enum thresh_type which, int *thresh) +{ + return __get_real_thresh(bat, which, thresh, NULL, NULL); +} + +/** + * set_real_thresh - write battery start/top charge threshold to SMAPI + * @bat: battery number (0 or 1) + * @which: THRESH_START or THRESH_STOP + * @thresh: 1..99, 0=default (passes as-is to SMAPI) + */ +static int set_real_thresh(int bat, enum thresh_type which, int thresh) +{ + u32 ebx = (which == THRESH_START) ? SMAPI_SET_THRESH_START + : SMAPI_SET_THRESH_STOP; + u32 ecx = ((bat+1)<<8) + thresh; + u32 getDI, getSI; + const char *msg; + int ret; + + /* verify read before writing */ + ret = __get_real_thresh(bat, which, NULL, &getDI, &getSI); + if (ret) + return ret; + + ret = smapi_write(ebx, ecx, getDI, getSI, &msg); + if (ret) + TPRINTK(KERN_NOTICE, "set %s to %d for bat=%d failed: %s", + THRESH_NAME(which), thresh, bat, msg); + else + TPRINTK(KERN_INFO, "set %s to %d for bat=%d", + THRESH_NAME(which), thresh, bat); + return ret; +} + +/** + * __get_inhibit_charge_minutes - get inhibit charge period from SMAPI + * @bat: battery number (0 or 1) + * @minutes: period in minutes (1..65535 minutes, 0=disabled) + * @outECX: some additional state that needs to be preserved, meaning unknown + * Note that @minutes is the originally set value, it does not count down. + */ +static int __get_inhibit_charge_minutes(int bat, int *minutes, u32 *outECX) +{ + u32 ecx = (bat+1)<<8; + u32 esi; + const char *msg; + int ret = smapi_request(SMAPI_GET_INHIBIT_CHARGE, ecx, 0, 0, + NULL, &ecx, NULL, NULL, &esi, &msg); + if (ret) { + TPRINTK(KERN_NOTICE, "failed for bat=%d: %s", bat, msg); + return ret; + } + if (!(ecx&0x0100)) { + TPRINTK(KERN_NOTICE, "bad ecx=0x%x for bat=%d", ecx, bat); + return -EIO; + } + if (minutes) + *minutes = (ecx&0x0001)?esi:0; + if (outECX) + *outECX = ecx; + return 0; +} + +/** + * get_inhibit_charge_minutes - get inhibit charge period from SMAPI + * @bat: battery number (0 or 1) + * @minutes: period in minutes (1..65535 minutes, 0=disabled) + * Note that @minutes is the originally set value, it does not count down. + */ +static int get_inhibit_charge_minutes(int bat, int *minutes) +{ + return __get_inhibit_charge_minutes(bat, minutes, NULL); +} + +/** + * set_inhibit_charge_minutes - write inhibit charge period to SMAPI + * @bat: battery number (0 or 1) + * @minutes: period in minutes (1..65535 minutes, 0=disabled) + */ +static int set_inhibit_charge_minutes(int bat, int minutes) +{ + u32 ecx; + const char *msg; + int ret; + + /* verify read before writing */ + ret = __get_inhibit_charge_minutes(bat, NULL, &ecx); + if (ret) + return ret; + + ecx = ((bat+1)<<8) | (ecx&0x00FE) | (minutes > 0 ? 0x0001 : 0x0000); + if (minutes > 0xFFFF) + minutes = 0xFFFF; + ret = smapi_write(SMAPI_SET_INHIBIT_CHARGE, ecx, 0, minutes, &msg); + if (ret) + TPRINTK(KERN_NOTICE, + "set to %d failed for bat=%d: %s", minutes, bat, msg); + else + TPRINTK(KERN_INFO, "set to %d for bat=%d\n", minutes, bat); + return ret; +} + + +/** + * get_force_discharge - get status of forced discharging from SMAPI + * @bat: battery number (0 or 1) + * @enabled: 1 if forced discharged is enabled, 0 if not + */ +static int get_force_discharge(int bat, int *enabled) +{ + u32 ecx = (bat+1)<<8; + const char *msg; + int ret = smapi_request(SMAPI_GET_FORCE_DISCHARGE, ecx, 0, 0, + NULL, &ecx, NULL, NULL, NULL, &msg); + if (ret) { + TPRINTK(KERN_NOTICE, "failed for bat=%d: %s", bat, msg); + return ret; + } + *enabled = (!(ecx&0x00000100) && (ecx&0x00000001))?1:0; + return 0; +} + +/** + * set_force_discharge - write status of forced discharging to SMAPI + * @bat: battery number (0 or 1) + * @enabled: 1 if forced discharged is enabled, 0 if not + */ +static int set_force_discharge(int bat, int enabled) +{ + u32 ecx = (bat+1)<<8; + const char *msg; + int ret = smapi_request(SMAPI_GET_FORCE_DISCHARGE, ecx, 0, 0, + NULL, &ecx, NULL, NULL, NULL, &msg); + if (ret) { + TPRINTK(KERN_NOTICE, "get failed for bat=%d: %s", bat, msg); + return ret; + } + if (ecx&0x00000100) { + TPRINTK(KERN_NOTICE, "cannot force discharge bat=%d", bat); + return -EIO; + } + + ecx = ((bat+1)<<8) | (ecx&0x000000FA) | (enabled?0x00000001:0); + ret = smapi_write(SMAPI_SET_FORCE_DISCHARGE, ecx, 0, 0, &msg); + if (ret) + TPRINTK(KERN_NOTICE, "set to %d failed for bat=%d: %s", + enabled, bat, msg); + else + TPRINTK(KERN_INFO, "set to %d for bat=%d", enabled, bat); + return ret; +} + + +/********************************************************************* + * Wrappers to threshold-related SMAPI functions, which handle default + * thresholds and related quirks. + */ + +/* Minimum, default and minimum difference for battery charging thresholds: */ +#define MIN_THRESH_DELTA 4 /* Min delta between start and stop thresh */ +#define MIN_THRESH_START 2 +#define MAX_THRESH_START (100-MIN_THRESH_DELTA) +#define MIN_THRESH_STOP (MIN_THRESH_START + MIN_THRESH_DELTA) +#define MAX_THRESH_STOP 100 +#define DEFAULT_THRESH_START MAX_THRESH_START +#define DEFAULT_THRESH_STOP MAX_THRESH_STOP + +/* The GUI of IBM's Battery Maximizer seems to show a start threshold that + * is 1 more than the value we set/get via SMAPI. Since the threshold is + * maintained across reboot, this can be confusing. So we kludge our + * interface for interoperability: */ +#define BATMAX_FIX 1 + +/* Get charge start/stop threshold (1..100), + * substituting default values if needed and applying BATMAT_FIX. */ +static int get_thresh(int bat, enum thresh_type which, int *thresh) +{ + int ret = get_real_thresh(bat, which, thresh); + if (ret) + return ret; + if (*thresh == 0) + *thresh = (which == THRESH_START) ? DEFAULT_THRESH_START + : DEFAULT_THRESH_STOP; + else if (which == THRESH_START) + *thresh += BATMAX_FIX; + return 0; +} + + +/* Set charge start/stop threshold (1..100), + * substituting default values if needed and applying BATMAT_FIX. */ +static int set_thresh(int bat, enum thresh_type which, int thresh) +{ + if (which == THRESH_STOP && thresh == DEFAULT_THRESH_STOP) + thresh = 0; /* 100 is out of range, but default means 100 */ + if (which == THRESH_START) + thresh -= BATMAX_FIX; + return set_real_thresh(bat, which, thresh); +} + +/********************************************************************* + * ThinkPad embedded controller readout and basic functions + */ + +/** + * read_tp_ec_row - read data row from the ThinkPad embedded controller + * @arg0: EC command code + * @bat: battery number, 0 or 1 + * @j: the byte value to be used for "junk" (unused) input/outputs + * @dataval: result vector + */ +static int read_tp_ec_row(u8 arg0, int bat, u8 j, u8 *dataval) +{ + int ret; + const struct thinkpad_ec_row args = { .mask = 0xFFFF, + .val = {arg0, j,j,j,j,j,j,j,j,j,j,j,j,j,j, (u8)bat} }; + struct thinkpad_ec_row data = { .mask = 0xFFFF }; + + ret = thinkpad_ec_lock(); + if (ret) + return ret; + ret = thinkpad_ec_read_row(&args, &data); + thinkpad_ec_unlock(); + memcpy(dataval, &data.val, TP_CONTROLLER_ROW_LEN); + return ret; +} + +/** + * power_device_present - check for presence of battery or AC power + * @bat: 0 for battery 0, 1 for battery 1, otherwise AC power + * Returns 1 if present, 0 if not present, negative if error. + */ +static int power_device_present(int bat) +{ + u8 row[TP_CONTROLLER_ROW_LEN]; + u8 test; + int ret = read_tp_ec_row(1, bat, 0, row); + if (ret) + return ret; + switch (bat) { + case 0: test = 0x40; break; /* battery 0 */ + case 1: test = 0x20; break; /* battery 1 */ + default: test = 0x80; /* AC power */ + } + return (row[0] & test) ? 1 : 0; +} + +/** + * bat_has_status - check if battery can report detailed status + * @bat: 0 for battery 0, 1 for battery 1 + * Returns 1 if yes, 0 if no, negative if error. + */ +static int bat_has_status(int bat) +{ + u8 row[TP_CONTROLLER_ROW_LEN]; + int ret = read_tp_ec_row(1, bat, 0, row); + if (ret) + return ret; + if ((row[0] & (bat?0x20:0x40)) == 0) /* no battery */ + return 0; + if ((row[1] & (0x60)) == 0) /* no status */ + return 0; + return 1; +} + +/** + * get_tp_ec_bat_16 - read a 16-bit value from EC battery status data + * @arg0: first argument to EC + * @off: offset in row returned from EC + * @bat: battery (0 or 1) + * @val: the 16-bit value obtained + * Returns nonzero on error. + */ +static int get_tp_ec_bat_16(u8 arg0, int offset, int bat, u16 *val) +{ + u8 row[TP_CONTROLLER_ROW_LEN]; + int ret; + if (bat_has_status(bat) != 1) + return -ENXIO; + ret = read_tp_ec_row(arg0, bat, 0, row); + if (ret) + return ret; + *val = *(u16 *)(row+offset); + return 0; +} + +/********************************************************************* + * sysfs attributes for batteries - + * definitions and helper functions + */ + +/* A custom device attribute struct which holds a battery number */ +struct bat_device_attribute { + struct device_attribute dev_attr; + int bat; +}; + +/** + * attr_get_bat - get the battery to which the attribute belongs + */ +static int attr_get_bat(struct device_attribute *attr) +{ + return container_of(attr, struct bat_device_attribute, dev_attr)->bat; +} + +/** + * show_tp_ec_bat_u16 - show an unsigned 16-bit battery attribute + * @arg0: specified 1st argument of EC raw to read + * @offset: byte offset in EC raw data + * @mul: correction factor to multiply by + * @na_msg: string to output is value not available (0xFFFFFFFF) + * @attr: battery attribute + * @buf: output buffer + * The 16-bit value is read from the EC, treated as unsigned, + * transformed as x->mul*x, and printed to the buffer. + * If the value is 0xFFFFFFFF and na_msg!=%NULL, na_msg is printed instead. + */ +static ssize_t show_tp_ec_bat_u16(u8 arg0, int offset, int mul, + const char *na_msg, + struct device_attribute *attr, char *buf) +{ + u16 val; + int ret = get_tp_ec_bat_16(arg0, offset, attr_get_bat(attr), &val); + if (ret) + return ret; + if (na_msg && val == 0xFFFF) + return sprintf(buf, "%s\n", na_msg); + else + return sprintf(buf, "%u\n", mul*(unsigned int)val); +} + +/** + * show_tp_ec_bat_s16 - show an signed 16-bit battery attribute + * @arg0: specified 1st argument of EC raw to read + * @offset: byte offset in EC raw data + * @mul: correction factor to multiply by + * @add: correction term to add after multiplication + * @attr: battery attribute + * @buf: output buffer + * The 16-bit value is read from the EC, treated as signed, + * transformed as x->mul*x+add, and printed to the buffer. + */ +static ssize_t show_tp_ec_bat_s16(u8 arg0, int offset, int mul, int add, + struct device_attribute *attr, char *buf) +{ + u16 val; + int ret = get_tp_ec_bat_16(arg0, offset, attr_get_bat(attr), &val); + if (ret) + return ret; + return sprintf(buf, "%d\n", mul*(s16)val+add); +} + +/** + * show_tp_ec_bat_str - show a string from EC battery status data + * @arg0: specified 1st argument of EC raw to read + * @offset: byte offset in EC raw data + * @maxlen: maximum string length + * @attr: battery attribute + * @buf: output buffer + */ +static ssize_t show_tp_ec_bat_str(u8 arg0, int offset, int maxlen, + struct device_attribute *attr, char *buf) +{ + int bat = attr_get_bat(attr); + u8 row[TP_CONTROLLER_ROW_LEN]; + int ret; + if (bat_has_status(bat) != 1) + return -ENXIO; + ret = read_tp_ec_row(arg0, bat, 0, row); + if (ret) + return ret; + strncpy(buf, (char *)row+offset, maxlen); + buf[maxlen] = 0; + strcat(buf, "\n"); + return strlen(buf); +} + +/** + * show_tp_ec_bat_power - show a power readout from EC battery status data + * @arg0: specified 1st argument of EC raw to read + * @offV: byte offset of voltage in EC raw data + * @offI: byte offset of current in EC raw data + * @attr: battery attribute + * @buf: output buffer + * Computes the power as current*voltage from the two given readout offsets. + */ +static ssize_t show_tp_ec_bat_power(u8 arg0, int offV, int offI, + struct device_attribute *attr, char *buf) +{ + u8 row[TP_CONTROLLER_ROW_LEN]; + int milliamp, millivolt, ret; + int bat = attr_get_bat(attr); + if (bat_has_status(bat) != 1) + return -ENXIO; + ret = read_tp_ec_row(1, bat, 0, row); + if (ret) + return ret; + millivolt = *(u16 *)(row+offV); + milliamp = *(s16 *)(row+offI); + return sprintf(buf, "%d\n", milliamp*millivolt/1000); /* units: mW */ +} + +/** + * show_tp_ec_bat_date - decode and show a date from EC battery status data + * @arg0: specified 1st argument of EC raw to read + * @offset: byte offset in EC raw data + * @attr: battery attribute + * @buf: output buffer + */ +static ssize_t show_tp_ec_bat_date(u8 arg0, int offset, + struct device_attribute *attr, char *buf) +{ + u8 row[TP_CONTROLLER_ROW_LEN]; + u16 v; + int ret; + int day, month, year; + int bat = attr_get_bat(attr); + if (bat_has_status(bat) != 1) + return -ENXIO; + ret = read_tp_ec_row(arg0, bat, 0, row); + if (ret) + return ret; + + /* Decode bit-packed: v = day | (month<<5) | ((year-1980)<<9) */ + v = *(u16 *)(row+offset); + day = v & 0x1F; + month = (v >> 5) & 0xF; + year = (v >> 9) + 1980; + + return sprintf(buf, "%04d-%02d-%02d\n", year, month, day); +} + + +/********************************************************************* + * sysfs attribute I/O for batteries - + * the actual attribute show/store functions + */ + +static ssize_t show_battery_start_charge_thresh(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int thresh; + int bat = attr_get_bat(attr); + int ret = get_thresh(bat, THRESH_START, &thresh); + if (ret) + return ret; + return sprintf(buf, "%d\n", thresh); /* units: percent */ +} + +static ssize_t show_battery_stop_charge_thresh(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int thresh; + int bat = attr_get_bat(attr); + int ret = get_thresh(bat, THRESH_STOP, &thresh); + if (ret) + return ret; + return sprintf(buf, "%d\n", thresh); /* units: percent */ +} + +/** + * store_battery_start_charge_thresh - store battery_start_charge_thresh attr + * Since this is a kernel<->user interface, we ensure a valid state for + * the hardware. We do this by clamping the requested threshold to the + * valid range and, if necessary, moving the other threshold so that + * it's MIN_THRESH_DELTA away from this one. + */ +static ssize_t store_battery_start_charge_thresh(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + int thresh, other_thresh, ret; + int bat = attr_get_bat(attr); + + if (sscanf(buf, "%d", &thresh) != 1 || thresh < 1 || thresh > 100) + return -EINVAL; + + if (thresh < MIN_THRESH_START) /* clamp up to MIN_THRESH_START */ + thresh = MIN_THRESH_START; + if (thresh > MAX_THRESH_START) /* clamp down to MAX_THRESH_START */ + thresh = MAX_THRESH_START; + + down(&smapi_mutex); + ret = get_thresh(bat, THRESH_STOP, &other_thresh); + if (ret != -EOPNOTSUPP && ret != -ENXIO) { + if (ret) /* other threshold is set? */ + goto out; + ret = get_real_thresh(bat, THRESH_START, NULL); + if (ret) /* this threshold is set? */ + goto out; + if (other_thresh < thresh+MIN_THRESH_DELTA) { + /* move other thresh to keep it above this one */ + ret = set_thresh(bat, THRESH_STOP, + thresh+MIN_THRESH_DELTA); + if (ret) + goto out; + } + } + ret = set_thresh(bat, THRESH_START, thresh); +out: + up(&smapi_mutex); + return count; + +} + +/** + * store_battery_stop_charge_thresh - store battery_stop_charge_thresh attr + * Since this is a kernel<->user interface, we ensure a valid state for + * the hardware. We do this by clamping the requested threshold to the + * valid range and, if necessary, moving the other threshold so that + * it's MIN_THRESH_DELTA away from this one. + */ +static ssize_t store_battery_stop_charge_thresh(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + int thresh, other_thresh, ret; + int bat = attr_get_bat(attr); + + if (sscanf(buf, "%d", &thresh) != 1 || thresh < 1 || thresh > 100) + return -EINVAL; + + if (thresh < MIN_THRESH_STOP) /* clamp up to MIN_THRESH_STOP */ + thresh = MIN_THRESH_STOP; + + down(&smapi_mutex); + ret = get_thresh(bat, THRESH_START, &other_thresh); + if (ret != -EOPNOTSUPP && ret != -ENXIO) { /* other threshold exists? */ + if (ret) + goto out; + /* this threshold exists? */ + ret = get_real_thresh(bat, THRESH_STOP, NULL); + if (ret) + goto out; + if (other_thresh >= thresh-MIN_THRESH_DELTA) { + /* move other thresh to be below this one */ + ret = set_thresh(bat, THRESH_START, + thresh-MIN_THRESH_DELTA); + if (ret) + goto out; + } + } + ret = set_thresh(bat, THRESH_STOP, thresh); +out: + up(&smapi_mutex); + return count; +} + +static ssize_t show_battery_inhibit_charge_minutes(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int minutes; + int bat = attr_get_bat(attr); + int ret = get_inhibit_charge_minutes(bat, &minutes); + if (ret) + return ret; + return sprintf(buf, "%d\n", minutes); /* units: minutes */ +} + +static ssize_t store_battery_inhibit_charge_minutes(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + int ret; + int minutes; + int bat = attr_get_bat(attr); + if (sscanf(buf, "%d", &minutes) != 1 || minutes < 0) { + TPRINTK(KERN_ERR, "inhibit_charge_minutes: " + "must be a non-negative integer"); + return -EINVAL; + } + ret = set_inhibit_charge_minutes(bat, minutes); + if (ret) + return ret; + return count; +} + +static ssize_t show_battery_force_discharge(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int enabled; + int bat = attr_get_bat(attr); + int ret = get_force_discharge(bat, &enabled); + if (ret) + return ret; + return sprintf(buf, "%d\n", enabled); /* type: boolean */ +} + +static ssize_t store_battery_force_discharge(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + int ret; + int enabled; + int bat = attr_get_bat(attr); + if (sscanf(buf, "%d", &enabled) != 1 || enabled < 0 || enabled > 1) + return -EINVAL; + ret = set_force_discharge(bat, enabled); + if (ret) + return ret; + return count; +} + +static ssize_t show_battery_installed( + struct device *dev, struct device_attribute *attr, char *buf) +{ + int bat = attr_get_bat(attr); + int ret = power_device_present(bat); + if (ret < 0) + return ret; + return sprintf(buf, "%d\n", ret); /* type: boolean */ +} + +static ssize_t show_battery_state( + struct device *dev, struct device_attribute *attr, char *buf) +{ + u8 row[TP_CONTROLLER_ROW_LEN]; + const char *txt; + int ret; + int bat = attr_get_bat(attr); + if (bat_has_status(bat) != 1) + return sprintf(buf, "none\n"); + ret = read_tp_ec_row(1, bat, 0, row); + if (ret) + return ret; + switch (row[1] & 0xf0) { + case 0xc0: txt = "idle"; break; + case 0xd0: txt = "discharging"; break; + case 0xe0: txt = "charging"; break; + default: return sprintf(buf, "unknown (0x%x)\n", row[1]); + } + return sprintf(buf, "%s\n", txt); /* type: string from fixed set */ +} + +static ssize_t show_battery_manufacturer( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* type: string. SBS spec v1.1 p34: ManufacturerName() */ + return show_tp_ec_bat_str(4, 2, TP_CONTROLLER_ROW_LEN-2, attr, buf); +} + +static ssize_t show_battery_model( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* type: string. SBS spec v1.1 p34: DeviceName() */ + return show_tp_ec_bat_str(5, 2, TP_CONTROLLER_ROW_LEN-2, attr, buf); +} + +static ssize_t show_battery_barcoding( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* type: string */ + return show_tp_ec_bat_str(7, 2, TP_CONTROLLER_ROW_LEN-2, attr, buf); +} + +static ssize_t show_battery_chemistry( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* type: string. SBS spec v1.1 p34-35: DeviceChemistry() */ + return show_tp_ec_bat_str(6, 2, 5, attr, buf); +} + +static ssize_t show_battery_voltage( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* units: mV. SBS spec v1.1 p24: Voltage() */ + return show_tp_ec_bat_u16(1, 6, 1, NULL, attr, buf); +} + +static ssize_t show_battery_design_voltage( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* units: mV. SBS spec v1.1 p32: DesignVoltage() */ + return show_tp_ec_bat_u16(3, 4, 1, NULL, attr, buf); +} + +static ssize_t show_battery_charging_max_voltage( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* units: mV. SBS spec v1.1 p37,39: ChargingVoltage() */ + return show_tp_ec_bat_u16(9, 8, 1, NULL, attr, buf); +} + +static ssize_t show_battery_group0_voltage( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* units: mV */ + return show_tp_ec_bat_u16(0xA, 12, 1, NULL, attr, buf); +} + +static ssize_t show_battery_group1_voltage( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* units: mV */ + return show_tp_ec_bat_u16(0xA, 10, 1, NULL, attr, buf); +} + +static ssize_t show_battery_group2_voltage( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* units: mV */ + return show_tp_ec_bat_u16(0xA, 8, 1, NULL, attr, buf); +} + +static ssize_t show_battery_group3_voltage( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* units: mV */ + return show_tp_ec_bat_u16(0xA, 6, 1, NULL, attr, buf); +} + +static ssize_t show_battery_current_now( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* units: mA. SBS spec v1.1 p24: Current() */ + return show_tp_ec_bat_s16(1, 8, 1, 0, attr, buf); +} + +static ssize_t show_battery_current_avg( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* units: mA. SBS spec v1.1 p24: AverageCurrent() */ + return show_tp_ec_bat_s16(1, 10, 1, 0, attr, buf); +} + +static ssize_t show_battery_charging_max_current( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* units: mA. SBS spec v1.1 p36,38: ChargingCurrent() */ + return show_tp_ec_bat_s16(9, 6, 1, 0, attr, buf); +} + +static ssize_t show_battery_power_now( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* units: mW. SBS spec v1.1: Voltage()*Current() */ + return show_tp_ec_bat_power(1, 6, 8, attr, buf); +} + +static ssize_t show_battery_power_avg( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* units: mW. SBS spec v1.1: Voltage()*AverageCurrent() */ + return show_tp_ec_bat_power(1, 6, 10, attr, buf); +} + +static ssize_t show_battery_remaining_percent( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* units: percent. SBS spec v1.1 p25: RelativeStateOfCharge() */ + return show_tp_ec_bat_u16(1, 12, 1, NULL, attr, buf); +} + +static ssize_t show_battery_remaining_percent_error( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* units: percent. SBS spec v1.1 p25: MaxError() */ + return show_tp_ec_bat_u16(9, 4, 1, NULL, attr, buf); +} + +static ssize_t show_battery_remaining_charging_time( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* units: minutes. SBS spec v1.1 p27: AverageTimeToFull() */ + return show_tp_ec_bat_u16(2, 8, 1, "not_charging", attr, buf); +} + +static ssize_t show_battery_remaining_running_time( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* units: minutes. SBS spec v1.1 p27: RunTimeToEmpty() */ + return show_tp_ec_bat_u16(2, 6, 1, "not_discharging", attr, buf); +} + +static ssize_t show_battery_remaining_running_time_now( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* units: minutes. SBS spec v1.1 p27: RunTimeToEmpty() */ + return show_tp_ec_bat_u16(2, 4, 1, "not_discharging", attr, buf); +} + +static ssize_t show_battery_remaining_capacity( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* units: mWh. SBS spec v1.1 p26. */ + return show_tp_ec_bat_u16(1, 14, 10, "", attr, buf); +} + +static ssize_t show_battery_last_full_capacity( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* units: mWh. SBS spec v1.1 p26: FullChargeCapacity() */ + return show_tp_ec_bat_u16(2, 2, 10, "", attr, buf); +} + +static ssize_t show_battery_design_capacity( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* units: mWh. SBS spec v1.1 p32: DesignCapacity() */ + return show_tp_ec_bat_u16(3, 2, 10, "", attr, buf); +} + +static ssize_t show_battery_cycle_count( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* units: ordinal. SBS spec v1.1 p32: CycleCount() */ + return show_tp_ec_bat_u16(2, 12, 1, "", attr, buf); +} + +static ssize_t show_battery_temperature( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* units: millicelsius. SBS spec v1.1: Temperature()*10 */ + return show_tp_ec_bat_s16(1, 4, 100, -273100, attr, buf); +} + +static ssize_t show_battery_serial( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* type: int. SBS spec v1.1 p34: SerialNumber() */ + return show_tp_ec_bat_u16(3, 10, 1, "", attr, buf); +} + +static ssize_t show_battery_manufacture_date( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* type: YYYY-MM-DD. SBS spec v1.1 p34: ManufactureDate() */ + return show_tp_ec_bat_date(3, 8, attr, buf); +} + +static ssize_t show_battery_first_use_date( + struct device *dev, struct device_attribute *attr, char *buf) +{ + /* type: YYYY-MM-DD */ + return show_tp_ec_bat_date(8, 2, attr, buf); +} + +/** + * show_battery_dump - show the battery's dump attribute + * The dump attribute gives a hex dump of all EC readouts related to a + * battery. Some of the enumerated values don't really exist (i.e., the + * EC function just leaves them untouched); we use a kludge to detect and + * denote these. + */ +#define MIN_DUMP_ARG0 0x00 +#define MAX_DUMP_ARG0 0x0a /* 0x0b is useful too but hangs old EC firmware */ +static ssize_t show_battery_dump( + struct device *dev, struct device_attribute *attr, char *buf) +{ + int i; + char *p = buf; + int bat = attr_get_bat(attr); + u8 arg0; /* first argument to EC */ + u8 rowa[TP_CONTROLLER_ROW_LEN], + rowb[TP_CONTROLLER_ROW_LEN]; + const u8 junka = 0xAA, + junkb = 0x55; /* junk values for testing changes */ + int ret; + + for (arg0 = MIN_DUMP_ARG0; arg0 <= MAX_DUMP_ARG0; ++arg0) { + if ((p-buf) > PAGE_SIZE-TP_CONTROLLER_ROW_LEN*5) + return -ENOMEM; /* don't overflow sysfs buf */ + /* Read raw twice with different junk values, + * to detect unused output bytes which are left unchaged: */ + ret = read_tp_ec_row(arg0, bat, junka, rowa); + if (ret) + return ret; + ret = read_tp_ec_row(arg0, bat, junkb, rowb); + if (ret) + return ret; + for (i = 0; i < TP_CONTROLLER_ROW_LEN; i++) { + if (rowa[i] == junka && rowb[i] == junkb) + p += sprintf(p, "-- "); /* unused by EC */ + else + p += sprintf(p, "%02x ", rowa[i]); + } + p += sprintf(p, "\n"); + } + return p-buf; +} + + +/********************************************************************* + * sysfs attribute I/O, other than batteries + */ + +static ssize_t show_ac_connected( + struct device *dev, struct device_attribute *attr, char *buf) +{ + int ret = power_device_present(0xFF); + if (ret < 0) + return ret; + return sprintf(buf, "%d\n", ret); /* type: boolean */ +} + +/********************************************************************* + * The the "smapi_request" sysfs attribute executes a raw SMAPI call. + * You write to make a request and read to get the result. The state + * is saved globally rather than per fd (sysfs limitation), so + * simultaenous requests may get each other's results! So this is for + * development and debugging only. + */ +#define MAX_SMAPI_ATTR_ANSWER_LEN 128 +static char smapi_attr_answer[MAX_SMAPI_ATTR_ANSWER_LEN] = ""; + +static ssize_t show_smapi_request(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int ret = snprintf(buf, PAGE_SIZE, "%s", smapi_attr_answer); + smapi_attr_answer[0] = '\0'; + return ret; +} + +static ssize_t store_smapi_request(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + unsigned int inEBX, inECX, inEDI, inESI; + u32 outEBX, outECX, outEDX, outEDI, outESI; + const char *msg; + int ret; + if (sscanf(buf, "%x %x %x %x", &inEBX, &inECX, &inEDI, &inESI) != 4) { + smapi_attr_answer[0] = '\0'; + return -EINVAL; + } + ret = smapi_request( + inEBX, inECX, inEDI, inESI, + &outEBX, &outECX, &outEDX, &outEDI, &outESI, &msg); + snprintf(smapi_attr_answer, MAX_SMAPI_ATTR_ANSWER_LEN, + "%x %x %x %x %x %d '%s'\n", + (unsigned int)outEBX, (unsigned int)outECX, + (unsigned int)outEDX, (unsigned int)outEDI, + (unsigned int)outESI, ret, msg); + if (ret) + return ret; + else + return count; +} + +/********************************************************************* + * Power management: the embedded controller forgets the battery + * thresholds when the system is suspended to disk and unplugged from + * AC and battery, so we restore it upon resume. + */ + +static int saved_threshs[4] = {-1, -1, -1, -1}; /* -1 = don't know */ + +static int tp_suspend(struct platform_device *dev, pm_message_t state) +{ + int restore = (state.event == PM_EVENT_HIBERNATE || + state.event == PM_EVENT_FREEZE); + if (!restore || get_real_thresh(0, THRESH_STOP , &saved_threshs[0])) + saved_threshs[0] = -1; + if (!restore || get_real_thresh(0, THRESH_START, &saved_threshs[1])) + saved_threshs[1] = -1; + if (!restore || get_real_thresh(1, THRESH_STOP , &saved_threshs[2])) + saved_threshs[2] = -1; + if (!restore || get_real_thresh(1, THRESH_START, &saved_threshs[3])) + saved_threshs[3] = -1; + DPRINTK("suspend saved: %d %d %d %d", saved_threshs[0], + saved_threshs[1], saved_threshs[2], saved_threshs[3]); + return 0; +} + +static int tp_resume(struct platform_device *dev) +{ + DPRINTK("resume restoring: %d %d %d %d", saved_threshs[0], + saved_threshs[1], saved_threshs[2], saved_threshs[3]); + if (saved_threshs[0] >= 0) + set_real_thresh(0, THRESH_STOP , saved_threshs[0]); + if (saved_threshs[1] >= 0) + set_real_thresh(0, THRESH_START, saved_threshs[1]); + if (saved_threshs[2] >= 0) + set_real_thresh(1, THRESH_STOP , saved_threshs[2]); + if (saved_threshs[3] >= 0) + set_real_thresh(1, THRESH_START, saved_threshs[3]); + return 0; +} + + +/********************************************************************* + * Driver model + */ + +static struct platform_driver tp_driver = { + .suspend = tp_suspend, + .resume = tp_resume, + .driver = { + .name = "smapi", + .owner = THIS_MODULE + }, +}; + + +/********************************************************************* + * Sysfs device model + */ + +/* Attributes in /sys/devices/platform/smapi/ */ + +static DEVICE_ATTR(ac_connected, 0444, show_ac_connected, NULL); +static DEVICE_ATTR(smapi_request, 0600, show_smapi_request, + store_smapi_request); + +static struct attribute *tp_root_attributes[] = { + &dev_attr_ac_connected.attr, + &dev_attr_smapi_request.attr, + NULL +}; +static struct attribute_group tp_root_attribute_group = { + .attrs = tp_root_attributes +}; + +/* Attributes under /sys/devices/platform/smapi/BAT{0,1}/ : + * Every attribute needs to be defined (i.e., statically allocated) for + * each battery, and then referenced in the attribute list of each battery. + * We use preprocessor voodoo to avoid duplicating the list of attributes 4 + * times. The preprocessor output is just normal sysfs attributes code. + */ + +/** + * FOREACH_BAT_ATTR - invoke the given macros on all our battery attributes + * @_BAT: battery number (0 or 1) + * @_ATTR_RW: macro to invoke for each read/write attribute + * @_ATTR_R: macro to invoke for each read-only attribute + */ +#define FOREACH_BAT_ATTR(_BAT, _ATTR_RW, _ATTR_R) \ + _ATTR_RW(_BAT, start_charge_thresh) \ + _ATTR_RW(_BAT, stop_charge_thresh) \ + _ATTR_RW(_BAT, inhibit_charge_minutes) \ + _ATTR_RW(_BAT, force_discharge) \ + _ATTR_R(_BAT, installed) \ + _ATTR_R(_BAT, state) \ + _ATTR_R(_BAT, manufacturer) \ + _ATTR_R(_BAT, model) \ + _ATTR_R(_BAT, barcoding) \ + _ATTR_R(_BAT, chemistry) \ + _ATTR_R(_BAT, voltage) \ + _ATTR_R(_BAT, group0_voltage) \ + _ATTR_R(_BAT, group1_voltage) \ + _ATTR_R(_BAT, group2_voltage) \ + _ATTR_R(_BAT, group3_voltage) \ + _ATTR_R(_BAT, current_now) \ + _ATTR_R(_BAT, current_avg) \ + _ATTR_R(_BAT, charging_max_current) \ + _ATTR_R(_BAT, power_now) \ + _ATTR_R(_BAT, power_avg) \ + _ATTR_R(_BAT, remaining_percent) \ + _ATTR_R(_BAT, remaining_percent_error) \ + _ATTR_R(_BAT, remaining_charging_time) \ + _ATTR_R(_BAT, remaining_running_time) \ + _ATTR_R(_BAT, remaining_running_time_now) \ + _ATTR_R(_BAT, remaining_capacity) \ + _ATTR_R(_BAT, last_full_capacity) \ + _ATTR_R(_BAT, design_voltage) \ + _ATTR_R(_BAT, charging_max_voltage) \ + _ATTR_R(_BAT, design_capacity) \ + _ATTR_R(_BAT, cycle_count) \ + _ATTR_R(_BAT, temperature) \ + _ATTR_R(_BAT, serial) \ + _ATTR_R(_BAT, manufacture_date) \ + _ATTR_R(_BAT, first_use_date) \ + _ATTR_R(_BAT, dump) + +/* Define several macros we will feed into FOREACH_BAT_ATTR: */ + +#define DEFINE_BAT_ATTR_RW(_BAT,_NAME) \ + static struct bat_device_attribute dev_attr_##_NAME##_##_BAT = { \ + .dev_attr = __ATTR(_NAME, 0644, show_battery_##_NAME, \ + store_battery_##_NAME), \ + .bat = _BAT \ + }; + +#define DEFINE_BAT_ATTR_R(_BAT,_NAME) \ + static struct bat_device_attribute dev_attr_##_NAME##_##_BAT = { \ + .dev_attr = __ATTR(_NAME, 0644, show_battery_##_NAME, 0), \ + .bat = _BAT \ + }; + +#define REF_BAT_ATTR(_BAT,_NAME) \ + &dev_attr_##_NAME##_##_BAT.dev_attr.attr, + +/* This provide all attributes for one battery: */ + +#define PROVIDE_BAT_ATTRS(_BAT) \ + FOREACH_BAT_ATTR(_BAT, DEFINE_BAT_ATTR_RW, DEFINE_BAT_ATTR_R) \ + static struct attribute *tp_bat##_BAT##_attributes[] = { \ + FOREACH_BAT_ATTR(_BAT, REF_BAT_ATTR, REF_BAT_ATTR) \ + NULL \ + }; \ + static struct attribute_group tp_bat##_BAT##_attribute_group = { \ + .name = "BAT" #_BAT, \ + .attrs = tp_bat##_BAT##_attributes \ + }; + +/* Finally genereate the attributes: */ + +PROVIDE_BAT_ATTRS(0) +PROVIDE_BAT_ATTRS(1) + +/* List of attribute groups */ + +static struct attribute_group *attr_groups[] = { + &tp_root_attribute_group, + &tp_bat0_attribute_group, + &tp_bat1_attribute_group, + NULL +}; + + +/********************************************************************* + * Init and cleanup + */ + +static struct attribute_group **next_attr_group; /* next to register */ + +static int __init tp_init(void) +{ + int ret; + printk(KERN_INFO "tp_smapi " TP_VERSION " loading...\n"); + + ret = find_smapi_port(); + if (ret < 0) + goto err; + else + smapi_port = ret; + + if (!request_region(smapi_port, 1, "smapi")) { + printk(KERN_ERR "tp_smapi cannot claim port 0x%x\n", + smapi_port); + ret = -ENXIO; + goto err; + } + + if (!request_region(SMAPI_PORT2, 1, "smapi")) { + printk(KERN_ERR "tp_smapi cannot claim port 0x%x\n", + SMAPI_PORT2); + ret = -ENXIO; + goto err_port1; + } + + ret = platform_driver_register(&tp_driver); + if (ret) + goto err_port2; + + pdev = platform_device_alloc("smapi", -1); + if (!pdev) { + ret = -ENOMEM; + goto err_driver; + } + + ret = platform_device_add(pdev); + if (ret) + goto err_device_free; + + for (next_attr_group = attr_groups; *next_attr_group; + ++next_attr_group) { + ret = sysfs_create_group(&pdev->dev.kobj, *next_attr_group); + if (ret) + goto err_attr; + } + + printk(KERN_INFO "tp_smapi successfully loaded (smapi_port=0x%x).\n", + smapi_port); + return 0; + +err_attr: + while (--next_attr_group >= attr_groups) + sysfs_remove_group(&pdev->dev.kobj, *next_attr_group); + platform_device_unregister(pdev); +err_device_free: + platform_device_put(pdev); +err_driver: + platform_driver_unregister(&tp_driver); +err_port2: + release_region(SMAPI_PORT2, 1); +err_port1: + release_region(smapi_port, 1); +err: + printk(KERN_ERR "tp_smapi init failed (ret=%d)!\n", ret); + return ret; +} + +static void __exit tp_exit(void) +{ + while (next_attr_group && --next_attr_group >= attr_groups) + sysfs_remove_group(&pdev->dev.kobj, *next_attr_group); + platform_device_unregister(pdev); + platform_driver_unregister(&tp_driver); + release_region(SMAPI_PORT2, 1); + if (smapi_port) + release_region(smapi_port, 1); + + printk(KERN_INFO "tp_smapi unloaded.\n"); +} + +module_init(tp_init); +module_exit(tp_exit); diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig index d145e0d9022755d4..4a62250778046f24 100644 --- a/drivers/scsi/Kconfig +++ b/drivers/scsi/Kconfig @@ -1613,4 +1613,6 @@ source "drivers/scsi/device_handler/Kconfig" source "drivers/scsi/osd/Kconfig" +source "drivers/scsi/vhba/Kconfig" + endmenu diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile index 93dbe58c47c845dd..0d8385621c312602 100644 --- a/drivers/scsi/Makefile +++ b/drivers/scsi/Makefile @@ -154,6 +154,7 @@ obj-$(CONFIG_SCSI_ENCLOSURE) += ses.o obj-$(CONFIG_SCSI_OSD_INITIATOR) += osd/ obj-$(CONFIG_SCSI_HISI_SAS) += hisi_sas/ +obj-$(CONFIG_VHBA) += vhba/ # This goes last, so that "real" scsi devices probe earlier obj-$(CONFIG_SCSI_DEBUG) += scsi_debug.o diff --git a/drivers/scsi/vhba/Kconfig b/drivers/scsi/vhba/Kconfig new file mode 100644 index 0000000000000000..7ccb7d8dc25c8d65 --- /dev/null +++ b/drivers/scsi/vhba/Kconfig @@ -0,0 +1,9 @@ +config VHBA + tristate "Virtual (SCSI) Host Bus Adapter" + depends on SCSI + ---help--- + This is the in-kernel part of CDEmu, a CD/DVD-ROM device + emulator. + + This driver can also be built as a module. If so, the module + will be called vhba. diff --git a/drivers/scsi/vhba/Makefile b/drivers/scsi/vhba/Makefile new file mode 100644 index 0000000000000000..a2a3f9d9c7c3814b --- /dev/null +++ b/drivers/scsi/vhba/Makefile @@ -0,0 +1,4 @@ +VHBA_VERSION := 20170610 + +obj-$(CONFIG_VHBA) += vhba.o +ccflags-y := -DVHBA_VERSION=\"$(VHBA_VERSION)\" -Werror diff --git a/drivers/scsi/vhba/vhba.c b/drivers/scsi/vhba/vhba.c new file mode 100644 index 0000000000000000..ff30e4cb51b61ec6 --- /dev/null +++ b/drivers/scsi/vhba/vhba.c @@ -0,0 +1,1076 @@ +/* + * vhba.c + * + * Copyright (C) 2007-2012 Chia-I Wu + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include + +#include +#include +#include +#include +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0) +#include +#else +#include +#endif +#include +#include +#include +#include +#ifdef CONFIG_COMPAT +#include +#endif +#include +#include +#include +#include +#include + +/* scatterlist.page_link and sg_page() were introduced in 2.6.24 */ +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) +#define USE_SG_PAGE +#include +#endif + +MODULE_AUTHOR("Chia-I Wu"); +MODULE_VERSION(VHBA_VERSION); +MODULE_DESCRIPTION("Virtual SCSI HBA"); +MODULE_LICENSE("GPL"); + +#ifdef DEBUG +#define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __FUNCTION__, ## args) +#else +#define DPRINTK(fmt, args...) +#endif + +/* scmd_dbg was introduced in 3.15 */ +#ifndef scmd_dbg +#define scmd_dbg(scmd, fmt, a...) \ + dev_dbg(&(scmd)->device->sdev_gendev, fmt, ##a) +#endif + +#ifndef scmd_warn +#define scmd_warn(scmd, fmt, a...) \ + dev_warn(&(scmd)->device->sdev_gendev, fmt, ##a) +#endif + +#define VHBA_MAX_SECTORS_PER_IO 256 +#define VHBA_MAX_ID 32 +#define VHBA_CAN_QUEUE 32 +#define VHBA_INVALID_ID VHBA_MAX_ID + +#define DATA_TO_DEVICE(dir) ((dir) == DMA_TO_DEVICE || (dir) == DMA_BIDIRECTIONAL) +#define DATA_FROM_DEVICE(dir) ((dir) == DMA_FROM_DEVICE || (dir) == DMA_BIDIRECTIONAL) + + +/* SCSI macros were introduced in 2.6.23 */ +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 23) +#define scsi_sg_count(cmd) ((cmd)->use_sg) +#define scsi_sglist(cmd) ((cmd)->request_buffer) +#define scsi_bufflen(cmd) ((cmd)->request_bufflen) +#define scsi_set_resid(cmd, to_read) {(cmd)->resid = (to_read);} +#endif + +/* 1-argument form of k[un]map_atomic was introduced in 2.6.37-rc1; + 2-argument form was deprecated in 3.4-rc1 */ +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 37) +#define vhba_kmap_atomic kmap_atomic +#define vhba_kunmap_atomic kunmap_atomic +#else +#define vhba_kmap_atomic(page) kmap_atomic(page, KM_USER0) +#define vhba_kunmap_atomic(page) kunmap_atomic(page, KM_USER0) +#endif + + +enum vhba_req_state { + VHBA_REQ_FREE, + VHBA_REQ_PENDING, + VHBA_REQ_READING, + VHBA_REQ_SENT, + VHBA_REQ_WRITING, +}; + +struct vhba_command { + struct scsi_cmnd *cmd; + int status; + struct list_head entry; +}; + +struct vhba_device { + uint id; + spinlock_t cmd_lock; + struct list_head cmd_list; + wait_queue_head_t cmd_wq; + atomic_t refcnt; +}; + +struct vhba_host { + struct Scsi_Host *shost; + spinlock_t cmd_lock; + int cmd_next; + struct vhba_command commands[VHBA_CAN_QUEUE]; + spinlock_t dev_lock; + struct vhba_device *devices[VHBA_MAX_ID]; + int num_devices; + DECLARE_BITMAP(chgmap, VHBA_MAX_ID); + int chgtype[VHBA_MAX_ID]; + struct work_struct scan_devices; +}; + +#define MAX_COMMAND_SIZE 16 + +struct vhba_request { + __u32 tag; + __u32 lun; + __u8 cdb[MAX_COMMAND_SIZE]; + __u8 cdb_len; + __u32 data_len; +}; + +struct vhba_response { + __u32 tag; + __u32 status; + __u32 data_len; +}; + +static struct vhba_command *vhba_alloc_command (void); +static void vhba_free_command (struct vhba_command *vcmd); + +static struct platform_device vhba_platform_device; + +static struct vhba_device *vhba_device_alloc (void) +{ + struct vhba_device *vdev; + + vdev = kzalloc(sizeof(struct vhba_device), GFP_KERNEL); + if (!vdev) { + return NULL; + } + + vdev->id = VHBA_INVALID_ID; + spin_lock_init(&vdev->cmd_lock); + INIT_LIST_HEAD(&vdev->cmd_list); + init_waitqueue_head(&vdev->cmd_wq); + atomic_set(&vdev->refcnt, 1); + + return vdev; +} + +static void vhba_device_put (struct vhba_device *vdev) +{ + if (atomic_dec_and_test(&vdev->refcnt)) { + kfree(vdev); + } +} + +static struct vhba_device *vhba_device_get (struct vhba_device *vdev) +{ + atomic_inc(&vdev->refcnt); + + return vdev; +} + +static int vhba_device_queue (struct vhba_device *vdev, struct scsi_cmnd *cmd) +{ + struct vhba_command *vcmd; + unsigned long flags; + + vcmd = vhba_alloc_command(); + if (!vcmd) { + return SCSI_MLQUEUE_HOST_BUSY; + } + + vcmd->cmd = cmd; + + spin_lock_irqsave(&vdev->cmd_lock, flags); + list_add_tail(&vcmd->entry, &vdev->cmd_list); + spin_unlock_irqrestore(&vdev->cmd_lock, flags); + + wake_up_interruptible(&vdev->cmd_wq); + + return 0; +} + +static int vhba_device_dequeue (struct vhba_device *vdev, struct scsi_cmnd *cmd) +{ + struct vhba_command *vcmd; + int retval; + unsigned long flags; + + spin_lock_irqsave(&vdev->cmd_lock, flags); + list_for_each_entry(vcmd, &vdev->cmd_list, entry) { + if (vcmd->cmd == cmd) { + list_del_init(&vcmd->entry); + break; + } + } + + /* command not found */ + if (&vcmd->entry == &vdev->cmd_list) { + spin_unlock_irqrestore(&vdev->cmd_lock, flags); + return SUCCESS; + } + + while (vcmd->status == VHBA_REQ_READING || vcmd->status == VHBA_REQ_WRITING) { + spin_unlock_irqrestore(&vdev->cmd_lock, flags); + scmd_dbg(cmd, "wait for I/O before aborting\n"); + schedule_timeout(1); + spin_lock_irqsave(&vdev->cmd_lock, flags); + } + + retval = (vcmd->status == VHBA_REQ_SENT) ? FAILED : SUCCESS; + + vhba_free_command(vcmd); + + spin_unlock_irqrestore(&vdev->cmd_lock, flags); + + return retval; +} + +static inline void vhba_scan_devices_add (struct vhba_host *vhost, int id) +{ + struct scsi_device *sdev; + + sdev = scsi_device_lookup(vhost->shost, 0, id, 0); + if (!sdev) { + scsi_add_device(vhost->shost, 0, id, 0); + } else { + dev_warn(&vhost->shost->shost_gendev, "tried to add an already-existing device 0:%d:0!\n", id); + scsi_device_put(sdev); + } +} + +static inline void vhba_scan_devices_remove (struct vhba_host *vhost, int id) +{ + struct scsi_device *sdev; + + sdev = scsi_device_lookup(vhost->shost, 0, id, 0); + if (sdev) { + scsi_remove_device(sdev); + scsi_device_put(sdev); + } else { + dev_warn(&vhost->shost->shost_gendev, "tried to remove non-existing device 0:%d:0!\n", id); + } +} + +static void vhba_scan_devices (struct work_struct *work) +{ + struct vhba_host *vhost = container_of(work, struct vhba_host, scan_devices); + unsigned long flags; + int id, change, exists; + + while (1) { + spin_lock_irqsave(&vhost->dev_lock, flags); + + id = find_first_bit(vhost->chgmap, vhost->shost->max_id); + if (id >= vhost->shost->max_id) { + spin_unlock_irqrestore(&vhost->dev_lock, flags); + break; + } + change = vhost->chgtype[id]; + exists = vhost->devices[id] != NULL; + + vhost->chgtype[id] = 0; + clear_bit(id, vhost->chgmap); + + spin_unlock_irqrestore(&vhost->dev_lock, flags); + + if (change < 0) { + dev_dbg(&vhost->shost->shost_gendev, "trying to remove target 0:%d:0\n", id); + vhba_scan_devices_remove(vhost, id); + } else if (change > 0) { + dev_dbg(&vhost->shost->shost_gendev, "trying to add target 0:%d:0\n", id); + vhba_scan_devices_add(vhost, id); + } else { + /* quick sequence of add/remove or remove/add; we determine + which one it was by checking if device structure exists */ + if (exists) { + /* remove followed by add: remove and (re)add */ + dev_dbg(&vhost->shost->shost_gendev, "trying to (re)add target 0:%d:0\n", id); + vhba_scan_devices_remove(vhost, id); + vhba_scan_devices_add(vhost, id); + } else { + /* add followed by remove: no-op */ + dev_dbg(&vhost->shost->shost_gendev, "no-op for target 0:%d:0\n", id); + } + } + } +} + +static int vhba_add_device (struct vhba_device *vdev) +{ + struct vhba_host *vhost; + int i; + unsigned long flags; + + vhost = platform_get_drvdata(&vhba_platform_device); + + vhba_device_get(vdev); + + spin_lock_irqsave(&vhost->dev_lock, flags); + if (vhost->num_devices >= vhost->shost->max_id) { + spin_unlock_irqrestore(&vhost->dev_lock, flags); + vhba_device_put(vdev); + return -EBUSY; + } + + for (i = 0; i < vhost->shost->max_id; i++) { + if (vhost->devices[i] == NULL) { + vdev->id = i; + vhost->devices[i] = vdev; + vhost->num_devices++; + set_bit(vdev->id, vhost->chgmap); + vhost->chgtype[vdev->id]++; + break; + } + } + spin_unlock_irqrestore(&vhost->dev_lock, flags); + + schedule_work(&vhost->scan_devices); + + return 0; +} + +static int vhba_remove_device (struct vhba_device *vdev) +{ + struct vhba_host *vhost; + unsigned long flags; + + vhost = platform_get_drvdata(&vhba_platform_device); + + spin_lock_irqsave(&vhost->dev_lock, flags); + set_bit(vdev->id, vhost->chgmap); + vhost->chgtype[vdev->id]--; + vhost->devices[vdev->id] = NULL; + vhost->num_devices--; + vdev->id = VHBA_INVALID_ID; + spin_unlock_irqrestore(&vhost->dev_lock, flags); + + vhba_device_put(vdev); + + schedule_work(&vhost->scan_devices); + + return 0; +} + +static struct vhba_device *vhba_lookup_device (int id) +{ + struct vhba_host *vhost; + struct vhba_device *vdev = NULL; + unsigned long flags; + + vhost = platform_get_drvdata(&vhba_platform_device); + + if (likely(id < vhost->shost->max_id)) { + spin_lock_irqsave(&vhost->dev_lock, flags); + vdev = vhost->devices[id]; + if (vdev) { + vdev = vhba_device_get(vdev); + } + + spin_unlock_irqrestore(&vhost->dev_lock, flags); + } + + return vdev; +} + +static struct vhba_command *vhba_alloc_command (void) +{ + struct vhba_host *vhost; + struct vhba_command *vcmd; + unsigned long flags; + int i; + + vhost = platform_get_drvdata(&vhba_platform_device); + + spin_lock_irqsave(&vhost->cmd_lock, flags); + + vcmd = vhost->commands + vhost->cmd_next++; + if (vcmd->status != VHBA_REQ_FREE) { + for (i = 0; i < vhost->shost->can_queue; i++) { + vcmd = vhost->commands + i; + + if (vcmd->status == VHBA_REQ_FREE) { + vhost->cmd_next = i + 1; + break; + } + } + + if (i == vhost->shost->can_queue) { + vcmd = NULL; + } + } + + if (vcmd) { + vcmd->status = VHBA_REQ_PENDING; + } + + vhost->cmd_next %= vhost->shost->can_queue; + + spin_unlock_irqrestore(&vhost->cmd_lock, flags); + + return vcmd; +} + +static void vhba_free_command (struct vhba_command *vcmd) +{ + struct vhba_host *vhost; + unsigned long flags; + + vhost = platform_get_drvdata(&vhba_platform_device); + + spin_lock_irqsave(&vhost->cmd_lock, flags); + vcmd->status = VHBA_REQ_FREE; + spin_unlock_irqrestore(&vhost->cmd_lock, flags); +} + +static int vhba_queuecommand_lck (struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) +{ + struct vhba_device *vdev; + int retval; + + scmd_dbg(cmd, "queue %lu\n", cmd->serial_number); + + vdev = vhba_lookup_device(cmd->device->id); + if (!vdev) { + scmd_dbg(cmd, "no such device\n"); + + cmd->result = DID_NO_CONNECT << 16; + done(cmd); + + return 0; + } + + cmd->scsi_done = done; + retval = vhba_device_queue(vdev, cmd); + + vhba_device_put(vdev); + + return retval; +} + +#ifdef DEF_SCSI_QCMD +DEF_SCSI_QCMD(vhba_queuecommand) +#else +#define vhba_queuecommand vhba_queuecommand_lck +#endif + +static int vhba_abort (struct scsi_cmnd *cmd) +{ + struct vhba_device *vdev; + int retval = SUCCESS; + + scmd_warn(cmd, "abort %lu\n", cmd->serial_number); + + vdev = vhba_lookup_device(cmd->device->id); + if (vdev) { + retval = vhba_device_dequeue(vdev, cmd); + vhba_device_put(vdev); + } else { + cmd->result = DID_NO_CONNECT << 16; + } + + return retval; +} + +static struct scsi_host_template vhba_template = { + .module = THIS_MODULE, + .name = "vhba", + .proc_name = "vhba", + .queuecommand = vhba_queuecommand, + .eh_abort_handler = vhba_abort, + .can_queue = VHBA_CAN_QUEUE, + .this_id = -1, + .cmd_per_lun = 1, + .max_sectors = VHBA_MAX_SECTORS_PER_IO, + .sg_tablesize = 256, +}; + +static ssize_t do_request (struct scsi_cmnd *cmd, char __user *buf, size_t buf_len) +{ + struct vhba_request vreq; + ssize_t ret; + + scmd_dbg(cmd, "request %lu, cdb 0x%x, bufflen %d, use_sg %d\n", + cmd->serial_number, cmd->cmnd[0], scsi_bufflen(cmd), scsi_sg_count(cmd)); + + ret = sizeof(vreq); + if (DATA_TO_DEVICE(cmd->sc_data_direction)) { + ret += scsi_bufflen(cmd); + } + + if (ret > buf_len) { + scmd_warn(cmd, "buffer too small (%zd < %zd) for a request\n", buf_len, ret); + return -EIO; + } + + vreq.tag = cmd->serial_number; + vreq.lun = cmd->device->lun; + memcpy(vreq.cdb, cmd->cmnd, MAX_COMMAND_SIZE); + vreq.cdb_len = cmd->cmd_len; + vreq.data_len = scsi_bufflen(cmd); + + if (copy_to_user(buf, &vreq, sizeof(vreq))) { + return -EFAULT; + } + + if (DATA_TO_DEVICE(cmd->sc_data_direction) && vreq.data_len) { + buf += sizeof(vreq); + + if (scsi_sg_count(cmd)) { + unsigned char buf_stack[64]; + unsigned char *kaddr, *uaddr, *kbuf; + struct scatterlist *sg = scsi_sglist(cmd); + int i; + + uaddr = (unsigned char *) buf; + + if (vreq.data_len > 64) { + kbuf = kmalloc(PAGE_SIZE, GFP_KERNEL); + } else { + kbuf = buf_stack; + } + + for (i = 0; i < scsi_sg_count(cmd); i++) { + size_t len = sg[i].length; + +#ifdef USE_SG_PAGE + kaddr = vhba_kmap_atomic(sg_page(&sg[i])); +#else + kaddr = vhba_kmap_atomic(sg[i].page); +#endif + memcpy(kbuf, kaddr + sg[i].offset, len); + vhba_kunmap_atomic(kaddr); + + if (copy_to_user(uaddr, kbuf, len)) { + if (kbuf != buf_stack) { + kfree(kbuf); + } + return -EFAULT; + } + uaddr += len; + } + + if (kbuf != buf_stack) { + kfree(kbuf); + } + } else { + if (copy_to_user(buf, scsi_sglist(cmd), vreq.data_len)) { + return -EFAULT; + } + } + } + + return ret; +} + +static ssize_t do_response (struct scsi_cmnd *cmd, const char __user *buf, size_t buf_len, struct vhba_response *res) +{ + ssize_t ret = 0; + + scmd_dbg(cmd, "response %lu, status %x, data len %d, use_sg %d\n", + cmd->serial_number, res->status, res->data_len, scsi_sg_count(cmd)); + + if (res->status) { + unsigned char sense_stack[SCSI_SENSE_BUFFERSIZE]; + + if (res->data_len > SCSI_SENSE_BUFFERSIZE) { + scmd_warn(cmd, "truncate sense (%d < %d)", SCSI_SENSE_BUFFERSIZE, res->data_len); + res->data_len = SCSI_SENSE_BUFFERSIZE; + } + + /* Copy via temporary buffer on stack in order to avoid problems + with PAX on grsecurity-enabled kernels */ + if (copy_from_user(sense_stack, buf, res->data_len)) { + return -EFAULT; + } + memcpy(cmd->sense_buffer, sense_stack, res->data_len); + + cmd->result = res->status; + + ret += res->data_len; + } else if (DATA_FROM_DEVICE(cmd->sc_data_direction) && scsi_bufflen(cmd)) { + size_t to_read; + + if (res->data_len > scsi_bufflen(cmd)) { + scmd_warn(cmd, "truncate data (%d < %d)\n", scsi_bufflen(cmd), res->data_len); + res->data_len = scsi_bufflen(cmd); + } + + to_read = res->data_len; + + if (scsi_sg_count(cmd)) { + unsigned char buf_stack[64]; + unsigned char *kaddr, *uaddr, *kbuf; + struct scatterlist *sg = scsi_sglist(cmd); + int i; + + uaddr = (unsigned char *)buf; + + if (res->data_len > 64) { + kbuf = kmalloc(PAGE_SIZE, GFP_KERNEL); + } else { + kbuf = buf_stack; + } + + for (i = 0; i < scsi_sg_count(cmd); i++) { + size_t len = (sg[i].length < to_read) ? sg[i].length : to_read; + + if (copy_from_user(kbuf, uaddr, len)) { + if (kbuf != buf_stack) { + kfree(kbuf); + } + return -EFAULT; + } + uaddr += len; + +#ifdef USE_SG_PAGE + kaddr = vhba_kmap_atomic(sg_page(&sg[i])); +#else + kaddr = vhba_kmap_atomic(sg[i].page); +#endif + memcpy(kaddr + sg[i].offset, kbuf, len); + vhba_kunmap_atomic(kaddr); + + to_read -= len; + if (to_read == 0) { + break; + } + } + + if (kbuf != buf_stack) { + kfree(kbuf); + } + } else { + if (copy_from_user(scsi_sglist(cmd), buf, res->data_len)) { + return -EFAULT; + } + + to_read -= res->data_len; + } + + scsi_set_resid(cmd, to_read); + + ret += res->data_len - to_read; + } + + return ret; +} + +static inline struct vhba_command *next_command (struct vhba_device *vdev) +{ + struct vhba_command *vcmd; + + list_for_each_entry(vcmd, &vdev->cmd_list, entry) { + if (vcmd->status == VHBA_REQ_PENDING) { + break; + } + } + + if (&vcmd->entry == &vdev->cmd_list) { + vcmd = NULL; + } + + return vcmd; +} + +static inline struct vhba_command *match_command (struct vhba_device *vdev, u32 tag) +{ + struct vhba_command *vcmd; + + list_for_each_entry(vcmd, &vdev->cmd_list, entry) { + if (vcmd->cmd->serial_number == tag) { + break; + } + } + + if (&vcmd->entry == &vdev->cmd_list) { + vcmd = NULL; + } + + return vcmd; +} + +static struct vhba_command *wait_command (struct vhba_device *vdev, unsigned long flags) +{ + struct vhba_command *vcmd; + DEFINE_WAIT(wait); + + while (!(vcmd = next_command(vdev))) { + if (signal_pending(current)) { + break; + } + + prepare_to_wait(&vdev->cmd_wq, &wait, TASK_INTERRUPTIBLE); + + spin_unlock_irqrestore(&vdev->cmd_lock, flags); + + schedule(); + + spin_lock_irqsave(&vdev->cmd_lock, flags); + } + + finish_wait(&vdev->cmd_wq, &wait); + if (vcmd) { + vcmd->status = VHBA_REQ_READING; + } + + return vcmd; +} + +static ssize_t vhba_ctl_read (struct file *file, char __user *buf, size_t buf_len, loff_t *offset) +{ + struct vhba_device *vdev; + struct vhba_command *vcmd; + ssize_t ret; + unsigned long flags; + + vdev = file->private_data; + + /* Get next command */ + if (file->f_flags & O_NONBLOCK) { + /* Non-blocking variant */ + spin_lock_irqsave(&vdev->cmd_lock, flags); + vcmd = next_command(vdev); + spin_unlock_irqrestore(&vdev->cmd_lock, flags); + + if (!vcmd) { + return -EWOULDBLOCK; + } + } else { + /* Blocking variant */ + spin_lock_irqsave(&vdev->cmd_lock, flags); + vcmd = wait_command(vdev, flags); + spin_unlock_irqrestore(&vdev->cmd_lock, flags); + + if (!vcmd) { + return -ERESTARTSYS; + } + } + + ret = do_request(vcmd->cmd, buf, buf_len); + + spin_lock_irqsave(&vdev->cmd_lock, flags); + if (ret >= 0) { + vcmd->status = VHBA_REQ_SENT; + *offset += ret; + } else { + vcmd->status = VHBA_REQ_PENDING; + } + + spin_unlock_irqrestore(&vdev->cmd_lock, flags); + + return ret; +} + +static ssize_t vhba_ctl_write (struct file *file, const char __user *buf, size_t buf_len, loff_t *offset) +{ + struct vhba_device *vdev; + struct vhba_command *vcmd; + struct vhba_response res; + ssize_t ret; + unsigned long flags; + + if (buf_len < sizeof(res)) { + return -EIO; + } + + if (copy_from_user(&res, buf, sizeof(res))) { + return -EFAULT; + } + + vdev = file->private_data; + + spin_lock_irqsave(&vdev->cmd_lock, flags); + vcmd = match_command(vdev, res.tag); + if (!vcmd || vcmd->status != VHBA_REQ_SENT) { + spin_unlock_irqrestore(&vdev->cmd_lock, flags); + DPRINTK("not expecting response\n"); + return -EIO; + } + vcmd->status = VHBA_REQ_WRITING; + spin_unlock_irqrestore(&vdev->cmd_lock, flags); + + ret = do_response(vcmd->cmd, buf + sizeof(res), buf_len - sizeof(res), &res); + + spin_lock_irqsave(&vdev->cmd_lock, flags); + if (ret >= 0) { + vcmd->cmd->scsi_done(vcmd->cmd); + ret += sizeof(res); + + /* don't compete with vhba_device_dequeue */ + if (!list_empty(&vcmd->entry)) { + list_del_init(&vcmd->entry); + vhba_free_command(vcmd); + } + } else { + vcmd->status = VHBA_REQ_SENT; + } + + spin_unlock_irqrestore(&vdev->cmd_lock, flags); + + return ret; +} + +static long vhba_ctl_ioctl (struct file *file, unsigned int cmd, unsigned long arg) +{ + struct vhba_device *vdev = file->private_data; + struct vhba_host *vhost; + struct scsi_device *sdev; + + switch (cmd) { + case 0xBEEF001: { + vhost = platform_get_drvdata(&vhba_platform_device); + sdev = scsi_device_lookup(vhost->shost, 0, vdev->id, 0); + + if (sdev) { + int id[4] = { + sdev->host->host_no, + sdev->channel, + sdev->id, + sdev->lun + }; + + scsi_device_put(sdev); + + if (copy_to_user((void *)arg, id, sizeof(id))) { + return -EFAULT; + } + + return 0; + } else { + return -ENODEV; + } + } + } + + return -ENOTTY; +} + +#ifdef CONFIG_COMPAT +static long vhba_ctl_compat_ioctl (struct file *file, unsigned int cmd, unsigned long arg) +{ + unsigned long compat_arg = (unsigned long)compat_ptr(arg); + return vhba_ctl_ioctl(file, cmd, compat_arg); +} +#endif + +static unsigned int vhba_ctl_poll (struct file *file, poll_table *wait) +{ + struct vhba_device *vdev = file->private_data; + unsigned int mask = 0; + unsigned long flags; + + poll_wait(file, &vdev->cmd_wq, wait); + + spin_lock_irqsave(&vdev->cmd_lock, flags); + if (next_command(vdev)) { + mask |= POLLIN | POLLRDNORM; + } + spin_unlock_irqrestore(&vdev->cmd_lock, flags); + + return mask; +} + +static int vhba_ctl_open (struct inode *inode, struct file *file) +{ + struct vhba_device *vdev; + int retval; + + DPRINTK("open\n"); + + /* check if vhba is probed */ + if (!platform_get_drvdata(&vhba_platform_device)) { + return -ENODEV; + } + + vdev = vhba_device_alloc(); + if (!vdev) { + return -ENOMEM; + } + + if (!(retval = vhba_add_device(vdev))) { + file->private_data = vdev; + } + + vhba_device_put(vdev); + + return retval; +} + +static int vhba_ctl_release (struct inode *inode, struct file *file) +{ + struct vhba_device *vdev; + struct vhba_command *vcmd; + unsigned long flags; + + DPRINTK("release\n"); + + vdev = file->private_data; + + vhba_device_get(vdev); + vhba_remove_device(vdev); + + spin_lock_irqsave(&vdev->cmd_lock, flags); + list_for_each_entry(vcmd, &vdev->cmd_list, entry) { + WARN_ON(vcmd->status == VHBA_REQ_READING || vcmd->status == VHBA_REQ_WRITING); + + scmd_warn(vcmd->cmd, "device released with command %lu\n", vcmd->cmd->serial_number); + vcmd->cmd->result = DID_NO_CONNECT << 16; + vcmd->cmd->scsi_done(vcmd->cmd); + + vhba_free_command(vcmd); + } + INIT_LIST_HEAD(&vdev->cmd_list); + spin_unlock_irqrestore(&vdev->cmd_lock, flags); + + vhba_device_put(vdev); + + return 0; +} + +static struct file_operations vhba_ctl_fops = { + .owner = THIS_MODULE, + .open = vhba_ctl_open, + .release = vhba_ctl_release, + .read = vhba_ctl_read, + .write = vhba_ctl_write, + .poll = vhba_ctl_poll, + .unlocked_ioctl = vhba_ctl_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = vhba_ctl_compat_ioctl, +#endif +}; + +static struct miscdevice vhba_miscdev = { + .minor = MISC_DYNAMIC_MINOR, + .name = "vhba_ctl", + .fops = &vhba_ctl_fops, +}; + +static int vhba_probe (struct platform_device *pdev) +{ + struct Scsi_Host *shost; + struct vhba_host *vhost; + int i; + + shost = scsi_host_alloc(&vhba_template, sizeof(struct vhba_host)); + if (!shost) { + return -ENOMEM; + } + + shost->max_id = VHBA_MAX_ID; + /* we don't support lun > 0 */ + shost->max_lun = 1; + shost->max_cmd_len = MAX_COMMAND_SIZE; + + vhost = (struct vhba_host *)shost->hostdata; + memset(vhost, 0, sizeof(*vhost)); + + vhost->shost = shost; + vhost->num_devices = 0; + spin_lock_init(&vhost->dev_lock); + spin_lock_init(&vhost->cmd_lock); + INIT_WORK(&vhost->scan_devices, vhba_scan_devices); + vhost->cmd_next = 0; + for (i = 0; i < vhost->shost->can_queue; i++) { + vhost->commands[i].status = VHBA_REQ_FREE; + } + + platform_set_drvdata(pdev, vhost); + + if (scsi_add_host(shost, &pdev->dev)) { + scsi_host_put(shost); + return -ENOMEM; + } + + return 0; +} + +static int vhba_remove (struct platform_device *pdev) +{ + struct vhba_host *vhost; + struct Scsi_Host *shost; + + vhost = platform_get_drvdata(pdev); + shost = vhost->shost; + + scsi_remove_host(shost); + scsi_host_put(shost); + + return 0; +} + +static void vhba_release (struct device * dev) +{ + return; +} + +static struct platform_device vhba_platform_device = { + .name = "vhba", + .id = -1, + .dev = { + .release = vhba_release, + }, +}; + +static struct platform_driver vhba_platform_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "vhba", + }, + .probe = vhba_probe, + .remove = vhba_remove, +}; + +static int __init vhba_init (void) +{ + int ret; + + ret = platform_device_register(&vhba_platform_device); + if (ret < 0) { + return ret; + } + + ret = platform_driver_register(&vhba_platform_driver); + if (ret < 0) { + platform_device_unregister(&vhba_platform_device); + return ret; + } + + ret = misc_register(&vhba_miscdev); + if (ret < 0) { + platform_driver_unregister(&vhba_platform_driver); + platform_device_unregister(&vhba_platform_device); + return ret; + } + + return 0; +} + +static void __exit vhba_exit(void) +{ + misc_deregister(&vhba_miscdev); + platform_driver_unregister(&vhba_platform_driver); + platform_device_unregister(&vhba_platform_device); +} + +module_init(vhba_init); +module_exit(vhba_exit); + diff --git a/drivers/tty/Kconfig b/drivers/tty/Kconfig index 95103054c0e469fa..c5af5f064e22b664 100644 --- a/drivers/tty/Kconfig +++ b/drivers/tty/Kconfig @@ -75,6 +75,19 @@ config VT_CONSOLE_SLEEP def_bool y depends on VT_CONSOLE && PM_SLEEP +config NR_TTY_DEVICES + int "Maximum tty device number" + depends on VT + range 12 63 + default 63 + ---help--- + This option is used to change the number of tty devices in /dev. + The default value is 63. The lowest number you can set is 12, + 63 is also the upper limit so we don't overrun the serial + consoles. + + If unsure, say 63. + config HW_CONSOLE bool depends on VT && !UML diff --git a/drivers/video/logo/Kconfig b/drivers/video/logo/Kconfig index 0037104d66ac320f..2dae13136fbd2c00 100644 --- a/drivers/video/logo/Kconfig +++ b/drivers/video/logo/Kconfig @@ -15,71 +15,138 @@ config FB_LOGO_EXTRA depends on FB=y default y if SPU_BASE +config LOGO_RANDOM + bool "Select random available logo" + default y + help + Enable this option to use any available logo randomly at bootup. + +comment "Available logos" + +config LOGO_PCK_CLUT224 + bool "224-color Zen Kernel/Meditating Tux logo" + default y + config LOGO_LINUX_MONO bool "Standard black and white Linux logo" - default y + default n config LOGO_LINUX_VGA16 bool "Standard 16-color Linux logo" - default y + default n config LOGO_LINUX_CLUT224 bool "Standard 224-color Linux logo" - default y + default n config LOGO_BLACKFIN_VGA16 bool "16-colour Blackfin Processor Linux logo" depends on BLACKFIN - default y + default n config LOGO_BLACKFIN_CLUT224 bool "224-colour Blackfin Processor Linux logo" depends on BLACKFIN - default y + default n + +config LOGO_OLDPCK_CLUT224 + bool "224-color Old Zen Kernel logo" + depends on LOGO + default n + +config LOGO_ARCH_CLUT224 + bool "224-color Arch Linux logo" + depends on LOGO + default n + +config LOGO_GENTOO_CLUT224 + bool "224-color Gentoo Linux logo" + depends on LOGO + default n + +config LOGO_EXHERBO_CLUT224 + bool "224-color Exherbo Linux logo" + depends on LOGO + default n + +config LOGO_SLACKWARE_CLUT224 + bool "224-color Slackware Linux logo" + depends on LOGO + default n + +config LOGO_DEBIAN_CLUT224 + bool "224-color Debian Linux logo" + depends on LOGO + default n + +config LOGO_FEDORASIMPLE_CLUT224 + bool "224-color Fedora Simple Linux logo" + depends on LOGO + default n + +config LOGO_FEDORAGLOSSY_CLUT224 + bool "224-color Fedora Glossy Linux logo" + depends on LOGO + default n + +config LOGO_TITS_CLUT224 + bool "224-color Tits logo" + depends on LOGO + default n + +config LOGO_BSD_CLUT224 + bool "224-color BSD Devil logo" + depends on LOGO + default n + +config LOGO_FBSD_CLUT224 + bool "224-color FreeBSD logo" + depends on LOGO + default n config LOGO_DEC_CLUT224 bool "224-color Digital Equipment Corporation Linux logo" depends on MACH_DECSTATION || ALPHA - default y + default n config LOGO_MAC_CLUT224 bool "224-color Macintosh Linux logo" depends on MAC - default y + default n config LOGO_PARISC_CLUT224 bool "224-color PA-RISC Linux logo" depends on PARISC - default y + default n config LOGO_SGI_CLUT224 bool "224-color SGI Linux logo" depends on SGI_IP22 || SGI_IP27 || SGI_IP32 - default y + default n config LOGO_SUN_CLUT224 bool "224-color Sun Linux logo" depends on SPARC - default y + default n config LOGO_SUPERH_MONO bool "Black and white SuperH Linux logo" depends on SUPERH - default y + default n config LOGO_SUPERH_VGA16 bool "16-color SuperH Linux logo" depends on SUPERH - default y + default n config LOGO_SUPERH_CLUT224 bool "224-color SuperH Linux logo" depends on SUPERH - default y + default n config LOGO_M32R_CLUT224 bool "224-color M32R Linux logo" depends on M32R - default y + default n endif # LOGO diff --git a/drivers/video/logo/Makefile b/drivers/video/logo/Makefile index 3b437813584cec4f..6a34664ddb0677e7 100644 --- a/drivers/video/logo/Makefile +++ b/drivers/video/logo/Makefile @@ -6,6 +6,18 @@ obj-$(CONFIG_LOGO_LINUX_VGA16) += logo_linux_vga16.o obj-$(CONFIG_LOGO_LINUX_CLUT224) += logo_linux_clut224.o obj-$(CONFIG_LOGO_BLACKFIN_CLUT224) += logo_blackfin_clut224.o obj-$(CONFIG_LOGO_BLACKFIN_VGA16) += logo_blackfin_vga16.o +obj-$(CONFIG_LOGO_PCK_CLUT224) += logo_zen_clut224.o +obj-$(CONFIG_LOGO_OLDPCK_CLUT224) += logo_oldzen_clut224.o +obj-$(CONFIG_LOGO_ARCH_CLUT224) += logo_arch_clut224.o +obj-$(CONFIG_LOGO_GENTOO_CLUT224) += logo_gentoo_clut224.o +obj-$(CONFIG_LOGO_EXHERBO_CLUT224) += logo_exherbo_clut224.o +obj-$(CONFIG_LOGO_SLACKWARE_CLUT224) += logo_slackware_clut224.o +obj-$(CONFIG_LOGO_DEBIAN_CLUT224) += logo_debian_clut224.o +obj-$(CONFIG_LOGO_FEDORASIMPLE_CLUT224) += logo_fedorasimple_clut224.o +obj-$(CONFIG_LOGO_FEDORAGLOSSY_CLUT224) += logo_fedoraglossy_clut224.o +obj-$(CONFIG_LOGO_TITS_CLUT224) += logo_tits_clut224.o +obj-$(CONFIG_LOGO_BSD_CLUT224) += logo_bsd_clut224.o +obj-$(CONFIG_LOGO_FBSD_CLUT224) += logo_fbsd_clut224.o obj-$(CONFIG_LOGO_DEC_CLUT224) += logo_dec_clut224.o obj-$(CONFIG_LOGO_MAC_CLUT224) += logo_mac_clut224.o obj-$(CONFIG_LOGO_PARISC_CLUT224) += logo_parisc_clut224.o diff --git a/drivers/video/logo/logo.c b/drivers/video/logo/logo.c index 4d50bfd13e7c9f58..7f5a6fe5a701f251 100644 --- a/drivers/video/logo/logo.c +++ b/drivers/video/logo/logo.c @@ -1,117 +1,173 @@ /* - * Linux logo to be displayed on boot - * - * Copyright (C) 1996 Larry Ewing (lewing@isc.tamu.edu) - * Copyright (C) 1996,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) - * Copyright (C) 2001 Greg Banks - * Copyright (C) 2001 Jan-Benedict Glaw - * Copyright (C) 2003 Geert Uytterhoeven - */ +* Linux logo to be displayed on boot +* +* Copyright (C) 1996 Larry Ewing (lewing@isc.tamu.edu) +* Copyright (C) 1996,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) +* Copyright (C) 2001 Greg Banks +* Copyright (C) 2001 Jan-Benedict Glaw +* Copyright (C) 2003 Geert Uytterhoeven +*/ #include #include #include +#ifdef CONFIG_LOGO_RANDOM +#include +#endif + #ifdef CONFIG_M68K #include #endif + static bool nologo; module_param(nologo, bool, 0); MODULE_PARM_DESC(nologo, "Disables startup logo"); +/* Monochromatic logos */ +static const struct linux_logo *logo_mono[] = { +#ifdef CONFIG_LOGO_LINUX_MONO + &logo_linux_mono, /* Generic Linux logo */ +#endif +#ifdef CONFIG_LOGO_SUPERH_MONO + &logo_superh_mono, /* SuperH Linux logo */ +#endif +}; + +/* 16-colour logos */ +static const struct linux_logo *logo_vga16[] = { +#ifdef CONFIG_LOGO_LINUX_VGA16 + &logo_linux_vga16, /* Generic Linux logo */ +#endif +#ifdef CONFIG_LOGO_BLACKFIN_VGA16 + &logo_blackfin_vga16, /* Blackfin processor logo */ +#endif +#ifdef CONFIG_LOGO_SUPERH_VGA16 + &logo_superh_vga16, /* SuperH Linux logo */ +#endif +}; + +/* 224-colour logos */ +static const struct linux_logo *logo_clut224[] = { +#ifdef CONFIG_LOGO_LINUX_CLUT224 + &logo_linux_clut224, /* Generic Linux logo */ +#endif +#ifdef CONFIG_LOGO_BLACKFIN_CLUT224 + &logo_blackfin_clut224, /* Blackfin Linux logo */ +#endif +#ifdef CONFIG_LOGO_DEC_CLUT224 + &logo_dec_clut224, /* DEC Linux logo on MIPS/MIPS64 or ALPHA */ +#endif +#ifdef CONFIG_LOGO_MAC_CLUT224 + &logo_mac_clut224, /* Macintosh Linux logo on m68k */ +#endif +#ifdef CONFIG_LOGO_PARISC_CLUT224 + &logo_parisc_clut224, /* PA-RISC Linux logo */ +#endif +#ifdef CONFIG_LOGO_SGI_CLUT224 + &logo_sgi_clut224, /* SGI Linux logo on MIPS/MIPS64 */ +#endif +#ifdef CONFIG_LOGO_SUN_CLUT224 + &logo_sun_clut224, /* Sun Linux logo */ +#endif +#ifdef CONFIG_LOGO_SUPERH_CLUT224 + &logo_superh_clut224, /* SuperH Linux logo */ +#endif +#ifdef CONFIG_LOGO_M32R_CLUT224 + &logo_m32r_clut224, /* M32R Linux logo */ +#endif +#ifdef CONFIG_LOGO_PCK_CLUT224 + &logo_zen_clut224, /* Zen-Kernel logo */ +#endif +#ifdef CONFIG_LOGO_OLDPCK_CLUT224 + &logo_oldzen_clut224, /* Old Zen-Kernel logo */ +#endif +#ifdef CONFIG_LOGO_ARCH_CLUT224 + &logo_arch_clut224, /* Arch Linux logo */ +#endif +#ifdef CONFIG_LOGO_GENTOO_CLUT224 + &logo_gentoo_clut224, /* Gentoo Linux logo */ +#endif +#ifdef CONFIG_LOGO_EXHERBO_CLUT224 + &logo_exherbo_clut224, /* Exherbo Linux logo */ +#endif +#ifdef CONFIG_LOGO_SLACKWARE_CLUT224 + &logo_slackware_clut224, /* Slackware Linux logo */ +#endif +#ifdef CONFIG_LOGO_DEBIAN_CLUT224 + &logo_debian_clut224, /* Debian Linux logo */ +#endif +#ifdef CONFIG_LOGO_FEDORASIMPLE_CLUT224 + &logo_fedorasimple_clut224, /* Fedora Simple logo */ +#endif +#ifdef CONFIG_LOGO_FEDORAGLOSSY_CLUT224 + &logo_fedoraglossy_clut224, /* Fedora Glossy logo */ +#endif +#ifdef CONFIG_LOGO_TITS_CLUT224 + &logo_tits_clut224, /* Tits logo */ +#endif +#ifdef CONFIG_LOGO_BSD_CLUT224 + &logo_bsd_clut224, /* BSD logo */ +#endif +#ifdef CONFIG_LOGO_FBSD_CLUT224 + &logo_fbsd_clut224, /* Free BSD logo */ +#endif +}; + +#ifdef CONFIG_LOGO_RANDOM +#define LOGO_INDEX(s) (get_random_int() % s) +#else +#define LOGO_INDEX(s) (s - 1) +#endif + /* * Logos are located in the initdata, and will be freed in kernel_init. * Use late_init to mark the logos as freed to prevent any further use. */ static bool logos_freed; static int __init fb_logo_late_init(void) { logos_freed = true; return 0; } late_initcall_sync(fb_logo_late_init); /* logo's are marked __initdata. Use __ref to tell * modpost that it is intended that this function uses data * marked __initdata. */ const struct linux_logo * __ref fb_find_logo(int depth) { const struct linux_logo *logo = NULL; + const struct linux_logo **array = NULL; + unsigned int size; if (nologo || logos_freed) return NULL; + /* Select logo array */ if (depth >= 1) { -#ifdef CONFIG_LOGO_LINUX_MONO - /* Generic Linux logo */ - logo = &logo_linux_mono; -#endif -#ifdef CONFIG_LOGO_SUPERH_MONO - /* SuperH Linux logo */ - logo = &logo_superh_mono; -#endif + array = logo_mono; + size = ARRAY_SIZE(logo_mono); } - if (depth >= 4) { -#ifdef CONFIG_LOGO_LINUX_VGA16 - /* Generic Linux logo */ - logo = &logo_linux_vga16; -#endif -#ifdef CONFIG_LOGO_BLACKFIN_VGA16 - /* Blackfin processor logo */ - logo = &logo_blackfin_vga16; -#endif -#ifdef CONFIG_LOGO_SUPERH_VGA16 - /* SuperH Linux logo */ - logo = &logo_superh_vga16; -#endif + array = logo_vga16; + size = ARRAY_SIZE(logo_vga16); } - if (depth >= 8) { -#ifdef CONFIG_LOGO_LINUX_CLUT224 - /* Generic Linux logo */ - logo = &logo_linux_clut224; -#endif -#ifdef CONFIG_LOGO_BLACKFIN_CLUT224 - /* Blackfin Linux logo */ - logo = &logo_blackfin_clut224; -#endif -#ifdef CONFIG_LOGO_DEC_CLUT224 - /* DEC Linux logo on MIPS/MIPS64 or ALPHA */ - logo = &logo_dec_clut224; -#endif -#ifdef CONFIG_LOGO_MAC_CLUT224 - /* Macintosh Linux logo on m68k */ - if (MACH_IS_MAC) - logo = &logo_mac_clut224; -#endif -#ifdef CONFIG_LOGO_PARISC_CLUT224 - /* PA-RISC Linux logo */ - logo = &logo_parisc_clut224; -#endif -#ifdef CONFIG_LOGO_SGI_CLUT224 - /* SGI Linux logo on MIPS/MIPS64 */ - logo = &logo_sgi_clut224; -#endif -#ifdef CONFIG_LOGO_SUN_CLUT224 - /* Sun Linux logo */ - logo = &logo_sun_clut224; -#endif -#ifdef CONFIG_LOGO_SUPERH_CLUT224 - /* SuperH Linux logo */ - logo = &logo_superh_clut224; -#endif -#ifdef CONFIG_LOGO_M32R_CLUT224 - /* M32R Linux logo */ - logo = &logo_m32r_clut224; -#endif + array = logo_clut224; + size = ARRAY_SIZE(logo_clut224); } + + /* We've got some logos to display */ + if (array && size) + logo = array[LOGO_INDEX(size)]; + return logo; } EXPORT_SYMBOL_GPL(fb_find_logo); diff --git a/drivers/video/logo/logo_arch_clut224.ppm b/drivers/video/logo/logo_arch_clut224.ppm new file mode 100644 index 0000000000000000..e4d8daa69d28fe10 --- /dev/null +++ b/drivers/video/logo/logo_arch_clut224.ppm @@ -0,0 +1,43204 @@ +P3 +# CREATOR: GIMP PNM Filter Version 1.1 +120 120 +255 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +2 +0 +0 +4 +7 +0 +4 +7 +0 +2 +0 +0 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1 5 6 1 5 6 +1 5 6 1 5 6 1 5 6 1 5 6 1 5 6 1 7 9 +1 7 9 1 7 9 1 7 9 1 7 9 1 8 11 1 8 11 +1 8 11 2 9 12 2 9 12 2 9 12 2 10 13 2 9 12 +2 10 13 2 10 13 2 10 13 2 9 12 1 8 11 1 8 11 +1 7 9 1 5 6 1 4 5 1 4 5 0 3 4 0 3 4 +0 1 1 0 1 1 0 1 1 0 0 1 0 0 0 0 0 0 +0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 +0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 +0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 +0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 +0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 +0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 0 1 1 +0 1 1 0 2 3 0 3 4 0 3 4 1 4 5 1 4 5 +1 7 9 1 7 9 1 7 9 1 7 9 1 7 9 1 7 9 +1 7 9 1 7 9 1 7 9 1 7 9 1 5 6 1 4 5 +1 5 6 1 5 6 1 5 6 1 4 5 1 4 5 1 4 5 +1 4 5 1 4 5 0 3 4 0 3 4 0 3 4 0 3 4 +0 3 4 0 3 4 0 3 4 0 3 4 1 4 5 1 4 5 +1 4 5 1 4 5 1 4 5 1 4 5 1 5 6 1 4 5 +1 5 6 1 7 9 1 7 9 1 7 9 1 7 9 1 7 9 +1 7 9 1 7 9 1 7 9 1 7 9 1 7 9 1 5 6 +1 4 5 0 3 4 0 3 4 0 2 3 0 2 3 0 1 1 +0 1 1 0 1 1 0 0 1 0 0 0 0 0 0 0 0 0 +0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 +0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 diff --git a/fs/Kconfig b/fs/Kconfig index 7aee6d699fd6b389..53731da06f66ccbb 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -125,6 +125,7 @@ if BLOCK menu "DOS/FAT/NT Filesystems" source "fs/fat/Kconfig" +source "fs/exfat/Kconfig" source "fs/ntfs/Kconfig" endmenu diff --git a/fs/Makefile b/fs/Makefile index 7bbaca9c67b146e2..bc255a7280dd9322 100644 --- a/fs/Makefile +++ b/fs/Makefile @@ -78,6 +78,7 @@ obj-$(CONFIG_HUGETLBFS) += hugetlbfs/ obj-$(CONFIG_CODA_FS) += coda/ obj-$(CONFIG_MINIX_FS) += minix/ obj-$(CONFIG_FAT_FS) += fat/ +obj-$(CONFIG_EXFAT_FS) += exfat/ obj-$(CONFIG_BFS_FS) += bfs/ obj-$(CONFIG_ISO9660_FS) += isofs/ obj-$(CONFIG_HFSPLUS_FS) += hfsplus/ # Before hfs to find wrapped HFS+ diff --git a/fs/exec.c b/fs/exec.c index 62175cbcc80171df..3aca8111a8e76078 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -63,6 +63,8 @@ #include #include +#include + #include #include #include @@ -861,8 +863,10 @@ static struct file *do_open_execat(int fd, struct filename *name, int flags) if (err) goto exit; - if (name->name[0] != '\0') + if (name->name[0] != '\0') { fsnotify_open(file); + trace_open_exec(name->name); + } out: return file; diff --git a/fs/exfat/Kconfig b/fs/exfat/Kconfig new file mode 100644 index 0000000000000000..78b32aa2ca196521 --- /dev/null +++ b/fs/exfat/Kconfig @@ -0,0 +1,39 @@ +config EXFAT_FS + tristate "exFAT fs support" + select NLS + help + This adds support for the exFAT file system. + +config EXFAT_DISCARD + bool "enable discard support" + depends on EXFAT_FS + default y + +config EXFAT_DELAYED_SYNC + bool "enable delayed sync" + depends on EXFAT_FS + default n + +config EXFAT_KERNEL_DEBUG + bool "enable kernel debug features via ioctl" + depends on EXFAT_FS + default n + +config EXFAT_DEBUG_MSG + bool "print debug messages" + depends on EXFAT_FS + default n + +config EXFAT_DEFAULT_CODEPAGE + int "Default codepage for exFAT" + default 437 + depends on EXFAT_FS + help + This option should be set to the codepage of your exFAT filesystems. + +config EXFAT_DEFAULT_IOCHARSET + string "Default iocharset for exFAT" + default "utf8" + depends on EXFAT_FS + help + Set this to the default input/output character set you'd like exFAT to use. diff --git a/fs/exfat/LICENSE b/fs/exfat/LICENSE new file mode 100644 index 0000000000000000..d159169d1050894d --- /dev/null +++ b/fs/exfat/LICENSE @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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It is safest +to attach them to the start of each source file to most effectively +convey the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License along + with this program; if not, write to the Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + +Also add information on how to contact you by electronic and paper mail. + +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: + + Gnomovision version 69, Copyright (C) year name of author + Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, the commands you use may +be called something other than `show w' and `show c'; they could even be +mouse-clicks or menu items--whatever suits your program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + , 1 April 1989 + Ty Coon, President of Vice + +This General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may +consider it more useful to permit linking proprietary applications with the +library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. diff --git a/fs/exfat/Makefile b/fs/exfat/Makefile new file mode 100644 index 0000000000000000..711ed87f991b4c03 --- /dev/null +++ b/fs/exfat/Makefile @@ -0,0 +1,54 @@ +# +# Makefile for Linux FAT12/FAT16/FAT32(VFAT)/FAT64(ExFAT) filesystem driver. +# + +ifneq ($(KERNELRELEASE),) +# call from kernel build system + +obj-$(CONFIG_EXFAT_FS) += exfat.o + +exfat-objs := exfat_core.o exfat_super.o exfat_api.o exfat_blkdev.o exfat_cache.o \ + exfat_data.o exfat_bitmap.o exfat_nls.o exfat_oal.o exfat_upcase.o + +else +# external module build + +EXTRA_FLAGS += -I$(PWD) + +# +# KDIR is a path to a directory containing kernel source. +# It can be specified on the command line passed to make to enable the module to +# be built and installed for a kernel other than the one currently running. +# By default it is the path to the symbolic link created when +# the current kernel's modules were installed, but +# any valid path to the directory in which the target kernel's source is located +# can be provided on the command line. +# +KDIR ?= /lib/modules/$(shell uname -r)/build +MDIR ?= /lib/modules/$(shell uname -r) +PWD := $(shell pwd) +PWD := $(shell pwd) + +export CONFIG_EXFAT_FS := m + +all: + $(MAKE) -C $(KDIR) M=$(PWD) modules + +clean: + $(MAKE) -C $(KDIR) M=$(PWD) clean + +help: + $(MAKE) -C $(KDIR) M=$(PWD) help + +install: exfat.ko + rm -f ${MDIR}/kernel/fs/exfat/exfat.ko + install -m644 -b -D exfat.ko ${MDIR}/kernel/fs/exfat/exfat.ko + depmod -aq + +uninstall: + rm -rf ${MDIR}/kernel/fs/exfat + depmod -aq + +endif + +.PHONY : all clean install uninstall diff --git a/fs/exfat/README.md b/fs/exfat/README.md new file mode 100644 index 0000000000000000..feab40038352cf71 --- /dev/null +++ b/fs/exfat/README.md @@ -0,0 +1,98 @@ +exfat-nofuse +============ + +Linux non-fuse read/write kernel driver for the exFAT, FAT12, FAT16 and vfat (FAT32) file systems.
+Originally ported from Android kernel v3.0. + +Kudos to ksv1986 for the mutex patch!
+Thanks to JackNorris for being awesome and providing the clear_inode() patch.
+
+Big thanks to lqs for completing the driver!
+Big thanks to benpicco for fixing 3.11.y compatibility! + + +Special thanks to github user AndreiLux for spreading the word about the leak!
+ + +Installing as a stand-alone module: +==================================== + + make + sudo make install + +To load the driver manually, run this as root: + + modprobe exfat + +You may also specify custom toolchains by using CROSS_COMPILE flag, in my case: +>CROSS_COMPILE=../dorimanx-SG2-I9100-Kernel/android-toolchain/bin/arm-eabi- + +Installing as a part of the kernel: +====================================== + +Let's take [linux] as the path to your kernel source dir... + + cd [linux] + cp -rvf exfat-nofuse [linux]/fs/exfat + +edit [linux]/fs/Kconfig +``` + menu "DOS/FAT/NT Filesystems" + + source "fs/fat/Kconfig" + +source "fs/exfat/Kconfig" + source "fs/ntfs/Kconfig" + endmenu +``` + + +edit [linux]/fs/Makefile +``` + obj-$(CONFIG_FAT_FS) += fat/ + +obj-$(CONFIG_EXFAT_FS) += exfat/ + obj-$(CONFIG_BFS_FS) += bfs/ +``` + + cd [linux] + make menuconfig + +Go to: +> File systems > DOS/FAT/NT +> check exfat as MODULE (M) +> (437) Default codepage for exFAT +> (utf8) Default iocharset for exFAT + +> ESC to main menu +> Save an Alternate Configuration File +> ESC ESC + +build your kernel + +Have fun. + + +Installing as a DKMS module: +================================= + +You can have even more fun with exfat-nofuse by installing it as a DKMS module has the main advantage of being auto-compiled (and thus, possibly surviving) between kernel upgrades. + +First, get dkms. On Ubuntu this should be: + + sudo apt install dkms + +Then copy the root of this repository to /usr/share: + + sudo cp -R . /usr/src/exfat-1.2.8 (or whatever version number declared on dkms.conf is) + sudo dkms add -m exfat -v 1.2.8 + +Build and load the module: + + sudo dkms build -m exfat -v 1.2.8 + sudo dkms install -m exfat -v 1.2.8 + +Now you have a proper dkms module that will work for a long time... hopefully. + + + +Free Software for the Free Minds! +================================= diff --git a/fs/exfat/dkms.conf b/fs/exfat/dkms.conf new file mode 100644 index 0000000000000000..d873c0aef4faae41 --- /dev/null +++ b/fs/exfat/dkms.conf @@ -0,0 +1,7 @@ +PACKAGE_NAME="exfat" +PACKAGE_VERSION="1.2.8" +MAKE="KDIR=/lib/modules/$kernelver/build MDIR=/lib/modules/$kernelver make" +CLEAN="make clean" +BUILT_MODULE_NAME[0]="exfat" +AUTOINSTALL="yes" +DEST_MODULE_LOCATION="/extra" diff --git a/fs/exfat/exfat-km.mk b/fs/exfat/exfat-km.mk new file mode 100644 index 0000000000000000..4e3ef07b36ece539 --- /dev/null +++ b/fs/exfat/exfat-km.mk @@ -0,0 +1,11 @@ +EXFAT_FOLDER ?= external/exfat-nofuse + +EXFAT_MODULE: + make clean -C $(EXFAT_FOLDER) KDIR=$(KERNEL_OUT) + make -j8 -C $(EXFAT_FOLDER) ARCH=arm KDIR=$(KERNEL_OUT) \ + $(if $(ARM_CROSS_COMPILE),$(ARM_CROSS_COMPILE),$(KERNEL_CROSS_COMPILE)) + mv $(EXFAT_FOLDER)/exfat.ko $(KERNEL_MODULES_OUT) + $(if $(ARM_EABI_TOOLCHAIN),$(ARM_EABI_TOOLCHAIN)/arm-eabi-strip, \ + $(KERNEL_TOOLCHAIN_PATH)strip) --strip-unneeded $(KERNEL_MODULES_OUT)/exfat.ko + +TARGET_KERNEL_MODULES += EXFAT_MODULE diff --git a/fs/exfat/exfat_api.c b/fs/exfat/exfat_api.c new file mode 100644 index 0000000000000000..32b29f0dd8d949b6 --- /dev/null +++ b/fs/exfat/exfat_api.c @@ -0,0 +1,528 @@ +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +/************************************************************************/ +/* */ +/* PROJECT : exFAT & FAT12/16/32 File System */ +/* FILE : exfat_api.c */ +/* PURPOSE : exFAT API Glue Layer */ +/* */ +/*----------------------------------------------------------------------*/ +/* NOTES */ +/* */ +/*----------------------------------------------------------------------*/ +/* REVISION HISTORY (Ver 0.9) */ +/* */ +/* - 2010.11.15 [Joosun Hahn] : first writing */ +/* */ +/************************************************************************/ + +#include +#include +#include + +#include "exfat_version.h" +#include "exfat_config.h" +#include "exfat_data.h" +#include "exfat_oal.h" + +#include "exfat_nls.h" +#include "exfat_api.h" +#include "exfat_super.h" +#include "exfat_core.h" + +/*----------------------------------------------------------------------*/ +/* Constant & Macro Definitions */ +/*----------------------------------------------------------------------*/ + +/*----------------------------------------------------------------------*/ +/* Global Variable Definitions */ +/*----------------------------------------------------------------------*/ + +extern struct semaphore z_sem; + +/*----------------------------------------------------------------------*/ +/* Local Variable Definitions */ +/*----------------------------------------------------------------------*/ + +/*----------------------------------------------------------------------*/ +/* Local Function Declarations */ +/*----------------------------------------------------------------------*/ + +/*======================================================================*/ +/* Global Function Definitions */ +/* - All functions for global use have same return value format, */ +/* that is, FFS_SUCCESS on success and several FS error code on */ +/* various error condition. */ +/*======================================================================*/ + +/*----------------------------------------------------------------------*/ +/* exFAT Filesystem Init & Exit Functions */ +/*----------------------------------------------------------------------*/ + +int FsInit(void) +{ + return ffsInit(); +} + +int FsShutdown(void) +{ + return ffsShutdown(); +} + +/*----------------------------------------------------------------------*/ +/* Volume Management Functions */ +/*----------------------------------------------------------------------*/ + +/* FsMountVol : mount the file system volume */ +int FsMountVol(struct super_block *sb) +{ + int err; + + sm_P(&z_sem); + + err = buf_init(sb); + if (!err) + err = ffsMountVol(sb); + else + buf_shutdown(sb); + + sm_V(&z_sem); + + return err; +} /* end of FsMountVol */ + +/* FsUmountVol : unmount the file system volume */ +int FsUmountVol(struct super_block *sb) +{ + int err; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + sm_P(&z_sem); + + /* acquire the lock for file system critical section */ + sm_P(&p_fs->v_sem); + + err = ffsUmountVol(sb); + buf_shutdown(sb); + + /* release the lock for file system critical section */ + sm_V(&p_fs->v_sem); + + sm_V(&z_sem); + + return err; +} /* end of FsUmountVol */ + +/* FsGetVolInfo : get the information of a file system volume */ +int FsGetVolInfo(struct super_block *sb, VOL_INFO_T *info) +{ + int err; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + /* check the validity of pointer parameters */ + if (info == NULL) + return FFS_ERROR; + + /* acquire the lock for file system critical section */ + sm_P(&p_fs->v_sem); + + err = ffsGetVolInfo(sb, info); + + /* release the lock for file system critical section */ + sm_V(&p_fs->v_sem); + + return err; +} /* end of FsGetVolInfo */ + +/* FsSyncVol : synchronize a file system volume */ +int FsSyncVol(struct super_block *sb, int do_sync) +{ + int err; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + /* acquire the lock for file system critical section */ + sm_P(&p_fs->v_sem); + + err = ffsSyncVol(sb, do_sync); + + /* release the lock for file system critical section */ + sm_V(&p_fs->v_sem); + + return err; +} /* end of FsSyncVol */ + + +/*----------------------------------------------------------------------*/ +/* File Operation Functions */ +/*----------------------------------------------------------------------*/ + +/* FsCreateFile : create a file */ +int FsLookupFile(struct inode *inode, char *path, FILE_ID_T *fid) +{ + int err; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + /* check the validity of pointer parameters */ + if ((fid == NULL) || (path == NULL) || (*path == '\0')) + return FFS_ERROR; + + /* acquire the lock for file system critical section */ + sm_P(&p_fs->v_sem); + + err = ffsLookupFile(inode, path, fid); + + /* release the lock for file system critical section */ + sm_V(&p_fs->v_sem); + + return err; +} /* end of FsLookupFile */ + +/* FsCreateFile : create a file */ +int FsCreateFile(struct inode *inode, char *path, u8 mode, FILE_ID_T *fid) +{ + int err; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + /* check the validity of pointer parameters */ + if ((fid == NULL) || (path == NULL) || (*path == '\0')) + return FFS_ERROR; + + /* acquire the lock for file system critical section */ + sm_P(&p_fs->v_sem); + + err = ffsCreateFile(inode, path, mode, fid); + + /* release the lock for file system critical section */ + sm_V(&p_fs->v_sem); + + return err; +} /* end of FsCreateFile */ + +int FsReadFile(struct inode *inode, FILE_ID_T *fid, void *buffer, u64 count, u64 *rcount) +{ + int err; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + /* check the validity of the given file id */ + if (fid == NULL) + return FFS_INVALIDFID; + + /* check the validity of pointer parameters */ + if (buffer == NULL) + return FFS_ERROR; + + /* acquire the lock for file system critical section */ + sm_P(&p_fs->v_sem); + + err = ffsReadFile(inode, fid, buffer, count, rcount); + + /* release the lock for file system critical section */ + sm_V(&p_fs->v_sem); + + return err; +} /* end of FsReadFile */ + +int FsWriteFile(struct inode *inode, FILE_ID_T *fid, void *buffer, u64 count, u64 *wcount) +{ + int err; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + /* check the validity of the given file id */ + if (fid == NULL) + return FFS_INVALIDFID; + + /* check the validity of pointer parameters */ + if (buffer == NULL) + return FFS_ERROR; + + /* acquire the lock for file system critical section */ + sm_P(&p_fs->v_sem); + + err = ffsWriteFile(inode, fid, buffer, count, wcount); + + /* release the lock for file system critical section */ + sm_V(&p_fs->v_sem); + + return err; +} /* end of FsWriteFile */ + +/* FsTruncateFile : resize the file length */ +int FsTruncateFile(struct inode *inode, u64 old_size, u64 new_size) +{ + int err; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + /* acquire the lock for file system critical section */ + sm_P(&p_fs->v_sem); + + DPRINTK("FsTruncateFile entered (inode %p size %llu)\n", inode, new_size); + + err = ffsTruncateFile(inode, old_size, new_size); + + DPRINTK("FsTruncateFile exitted (%d)\n", err); + + /* release the lock for file system critical section */ + sm_V(&p_fs->v_sem); + + return err; +} /* end of FsTruncateFile */ + +/* FsMoveFile : move(rename) a old file into a new file */ +int FsMoveFile(struct inode *old_parent_inode, FILE_ID_T *fid, struct inode *new_parent_inode, struct dentry *new_dentry) +{ + int err; + struct super_block *sb = old_parent_inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + /* check the validity of the given file id */ + if (fid == NULL) + return FFS_INVALIDFID; + + /* acquire the lock for file system critical section */ + sm_P(&p_fs->v_sem); + + err = ffsMoveFile(old_parent_inode, fid, new_parent_inode, new_dentry); + + /* release the lock for file system critical section */ + sm_V(&p_fs->v_sem); + + return err; +} /* end of FsMoveFile */ + +/* FsRemoveFile : remove a file */ +int FsRemoveFile(struct inode *inode, FILE_ID_T *fid) +{ + int err; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + /* check the validity of the given file id */ + if (fid == NULL) + return FFS_INVALIDFID; + + /* acquire the lock for file system critical section */ + sm_P(&p_fs->v_sem); + + err = ffsRemoveFile(inode, fid); + + /* release the lock for file system critical section */ + sm_V(&p_fs->v_sem); + + return err; +} /* end of FsRemoveFile */ + +/* FsSetAttr : set the attribute of a given file */ +int FsSetAttr(struct inode *inode, u32 attr) +{ + int err; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + /* acquire the lock for file system critical section */ + sm_P(&p_fs->v_sem); + + err = ffsSetAttr(inode, attr); + + /* release the lock for file system critical section */ + sm_V(&p_fs->v_sem); + + return err; +} /* end of FsSetAttr */ + +/* FsReadStat : get the information of a given file */ +int FsReadStat(struct inode *inode, DIR_ENTRY_T *info) +{ + int err; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + /* acquire the lock for file system critical section */ + sm_P(&p_fs->v_sem); + + err = ffsGetStat(inode, info); + + /* release the lock for file system critical section */ + sm_V(&p_fs->v_sem); + + return err; +} /* end of FsReadStat */ + +/* FsWriteStat : set the information of a given file */ +int FsWriteStat(struct inode *inode, DIR_ENTRY_T *info) +{ + int err; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + /* acquire the lock for file system critical section */ + sm_P(&p_fs->v_sem); + + DPRINTK("FsWriteStat entered (inode %p info %p\n", inode, info); + + err = ffsSetStat(inode, info); + + /* release the lock for file system critical section */ + sm_V(&p_fs->v_sem); + + DPRINTK("FsWriteStat exited (%d)\n", err); + + return err; +} /* end of FsWriteStat */ + +/* FsMapCluster : return the cluster number in the given cluster offset */ +int FsMapCluster(struct inode *inode, s32 clu_offset, u32 *clu) +{ + int err; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + /* check the validity of pointer parameters */ + if (clu == NULL) + return FFS_ERROR; + + /* acquire the lock for file system critical section */ + sm_P(&p_fs->v_sem); + + err = ffsMapCluster(inode, clu_offset, clu); + + /* release the lock for file system critical section */ + sm_V(&p_fs->v_sem); + + return err; +} /* end of FsMapCluster */ + +/*----------------------------------------------------------------------*/ +/* Directory Operation Functions */ +/*----------------------------------------------------------------------*/ + +/* FsCreateDir : create(make) a directory */ +int FsCreateDir(struct inode *inode, char *path, FILE_ID_T *fid) +{ + int err; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + /* check the validity of pointer parameters */ + if ((fid == NULL) || (path == NULL) || (*path == '\0')) + return FFS_ERROR; + + /* acquire the lock for file system critical section */ + sm_P(&p_fs->v_sem); + + err = ffsCreateDir(inode, path, fid); + + /* release the lock for file system critical section */ + sm_V(&p_fs->v_sem); + + return err; +} /* end of FsCreateDir */ + +/* FsReadDir : read a directory entry from the opened directory */ +int FsReadDir(struct inode *inode, DIR_ENTRY_T *dir_entry) +{ + int err; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + /* check the validity of pointer parameters */ + if (dir_entry == NULL) + return FFS_ERROR; + + /* acquire the lock for file system critical section */ + sm_P(&p_fs->v_sem); + + err = ffsReadDir(inode, dir_entry); + + /* release the lock for file system critical section */ + sm_V(&p_fs->v_sem); + + return err; +} /* end of FsReadDir */ + +/* FsRemoveDir : remove a directory */ +int FsRemoveDir(struct inode *inode, FILE_ID_T *fid) +{ + int err; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + /* check the validity of the given file id */ + if (fid == NULL) + return FFS_INVALIDFID; + + /* acquire the lock for file system critical section */ + sm_P(&p_fs->v_sem); + + err = ffsRemoveDir(inode, fid); + + /* release the lock for file system critical section */ + sm_V(&p_fs->v_sem); + + return err; +} /* end of FsRemoveDir */ + +EXPORT_SYMBOL(FsMountVol); +EXPORT_SYMBOL(FsUmountVol); +EXPORT_SYMBOL(FsGetVolInfo); +EXPORT_SYMBOL(FsSyncVol); +EXPORT_SYMBOL(FsLookupFile); +EXPORT_SYMBOL(FsCreateFile); +EXPORT_SYMBOL(FsReadFile); +EXPORT_SYMBOL(FsWriteFile); +EXPORT_SYMBOL(FsTruncateFile); +EXPORT_SYMBOL(FsMoveFile); +EXPORT_SYMBOL(FsRemoveFile); +EXPORT_SYMBOL(FsSetAttr); +EXPORT_SYMBOL(FsReadStat); +EXPORT_SYMBOL(FsWriteStat); +EXPORT_SYMBOL(FsMapCluster); +EXPORT_SYMBOL(FsCreateDir); +EXPORT_SYMBOL(FsReadDir); +EXPORT_SYMBOL(FsRemoveDir); + +#ifdef CONFIG_EXFAT_KERNEL_DEBUG +/* FsReleaseCache: Release FAT & buf cache */ +int FsReleaseCache(struct super_block *sb) +{ + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + /* acquire the lock for file system critical section */ + sm_P(&p_fs->v_sem); + + FAT_release_all(sb); + buf_release_all(sb); + + /* release the lock for file system critical section */ + sm_V(&p_fs->v_sem); + + return 0; +} +/* FsReleaseCache */ + +EXPORT_SYMBOL(FsReleaseCache); +#endif /* CONFIG_EXFAT_KERNEL_DEBUG */ + +/*======================================================================*/ +/* Local Function Definitions */ +/*======================================================================*/ diff --git a/fs/exfat/exfat_api.h b/fs/exfat/exfat_api.h new file mode 100644 index 0000000000000000..84bdf612a1e66cda --- /dev/null +++ b/fs/exfat/exfat_api.h @@ -0,0 +1,206 @@ +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +/************************************************************************/ +/* */ +/* PROJECT : exFAT & FAT12/16/32 File System */ +/* FILE : exfat_api.h */ +/* PURPOSE : Header File for exFAT API Glue Layer */ +/* */ +/*----------------------------------------------------------------------*/ +/* NOTES */ +/* */ +/*----------------------------------------------------------------------*/ +/* REVISION HISTORY (Ver 0.9) */ +/* */ +/* - 2010.11.15 [Joosun Hahn] : first writing */ +/* */ +/************************************************************************/ + +#ifndef _EXFAT_API_H +#define _EXFAT_API_H + +#include +#include "exfat_config.h" + +/*----------------------------------------------------------------------*/ +/* Constant & Macro Definitions */ +/*----------------------------------------------------------------------*/ + +#define EXFAT_SUPER_MAGIC (0x2011BAB0L) +#define EXFAT_ROOT_INO 1 + +/* FAT types */ +#define FAT12 0x01 /* FAT12 */ +#define FAT16 0x0E /* Win95 FAT16 (LBA) */ +#define FAT32 0x0C /* Win95 FAT32 (LBA) */ +#define EXFAT 0x07 /* exFAT */ + +/* file name lengths */ +#define MAX_CHARSET_SIZE 3 /* max size of multi-byte character */ +#define MAX_PATH_DEPTH 15 /* max depth of path name */ +#define MAX_NAME_LENGTH 256 /* max len of file name including NULL */ +#define MAX_PATH_LENGTH 260 /* max len of path name including NULL */ +#define DOS_NAME_LENGTH 11 /* DOS file name length excluding NULL */ +#define DOS_PATH_LENGTH 80 /* DOS path name length excluding NULL */ + +/* file attributes */ +#define ATTR_NORMAL 0x0000 +#define ATTR_READONLY 0x0001 +#define ATTR_HIDDEN 0x0002 +#define ATTR_SYSTEM 0x0004 +#define ATTR_VOLUME 0x0008 +#define ATTR_SUBDIR 0x0010 +#define ATTR_ARCHIVE 0x0020 +#define ATTR_SYMLINK 0x0040 +#define ATTR_EXTEND 0x000F +#define ATTR_RWMASK 0x007E + +/* file creation modes */ +#define FM_REGULAR 0x00 +#define FM_SYMLINK 0x40 + +/* return values */ +#define FFS_SUCCESS 0 +#define FFS_MEDIAERR 1 +#define FFS_FORMATERR 2 +#define FFS_MOUNTED 3 +#define FFS_NOTMOUNTED 4 +#define FFS_ALIGNMENTERR 5 +#define FFS_SEMAPHOREERR 6 +#define FFS_INVALIDPATH 7 +#define FFS_INVALIDFID 8 +#define FFS_NOTFOUND 9 +#define FFS_FILEEXIST 10 +#define FFS_PERMISSIONERR 11 +#define FFS_NOTOPENED 12 +#define FFS_MAXOPENED 13 +#define FFS_FULL 14 +#define FFS_EOF 15 +#define FFS_DIRBUSY 16 +#define FFS_MEMORYERR 17 +#define FFS_NAMETOOLONG 18 +#define FFS_ERROR 19 + +/*----------------------------------------------------------------------*/ +/* Type Definitions */ +/*----------------------------------------------------------------------*/ + +typedef struct { + u16 Year; + u16 Month; + u16 Day; + u16 Hour; + u16 Minute; + u16 Second; + u16 MilliSecond; +} DATE_TIME_T; + +typedef struct { + u32 Offset; /* start sector number of the partition */ + u32 Size; /* in sectors */ +} PART_INFO_T; + +typedef struct { + u32 SecSize; /* sector size in bytes */ + u32 DevSize; /* block device size in sectors */ +} DEV_INFO_T; + +typedef struct { + u32 FatType; + u32 ClusterSize; + u32 NumClusters; + u32 FreeClusters; + u32 UsedClusters; +} VOL_INFO_T; + +/* directory structure */ +typedef struct { + u32 dir; + s32 size; + u8 flags; +} CHAIN_T; + +/* file id structure */ +typedef struct { + CHAIN_T dir; + s32 entry; + u32 type; + u32 attr; + u32 start_clu; + u64 size; + u8 flags; + s64 rwoffset; + s32 hint_last_off; + u32 hint_last_clu; +} FILE_ID_T; + +typedef struct { + char Name[MAX_NAME_LENGTH * MAX_CHARSET_SIZE]; + char ShortName[DOS_NAME_LENGTH + 2]; /* used only for FAT12/16/32, not used for exFAT */ + u32 Attr; + u64 Size; + u32 NumSubdirs; + DATE_TIME_T CreateTimestamp; + DATE_TIME_T ModifyTimestamp; + DATE_TIME_T AccessTimestamp; +} DIR_ENTRY_T; + +/*======================================================================*/ +/* */ +/* API FUNCTION DECLARATIONS */ +/* (CHANGE THIS PART IF REQUIRED) */ +/* */ +/*======================================================================*/ + +/*----------------------------------------------------------------------*/ +/* External Function Declarations */ +/*----------------------------------------------------------------------*/ + +/* file system initialization & shutdown functions */ + int FsInit(void); + int FsShutdown(void); + +/* volume management functions */ + int FsMountVol(struct super_block *sb); + int FsUmountVol(struct super_block *sb); + int FsGetVolInfo(struct super_block *sb, VOL_INFO_T *info); + int FsSyncVol(struct super_block *sb, int do_sync); + +/* file management functions */ + int FsLookupFile(struct inode *inode, char *path, FILE_ID_T *fid); + int FsCreateFile(struct inode *inode, char *path, u8 mode, FILE_ID_T *fid); + int FsReadFile(struct inode *inode, FILE_ID_T *fid, void *buffer, u64 count, u64 *rcount); + int FsWriteFile(struct inode *inode, FILE_ID_T *fid, void *buffer, u64 count, u64 *wcount); + int FsTruncateFile(struct inode *inode, u64 old_size, u64 new_size); + int FsMoveFile(struct inode *old_parent_inode, FILE_ID_T *fid, struct inode *new_parent_inode, struct dentry *new_dentry); + int FsRemoveFile(struct inode *inode, FILE_ID_T *fid); + int FsSetAttr(struct inode *inode, u32 attr); + int FsReadStat(struct inode *inode, DIR_ENTRY_T *info); + int FsWriteStat(struct inode *inode, DIR_ENTRY_T *info); + int FsMapCluster(struct inode *inode, s32 clu_offset, u32 *clu); + +/* directory management functions */ + int FsCreateDir(struct inode *inode, char *path, FILE_ID_T *fid); + int FsReadDir(struct inode *inode, DIR_ENTRY_T *dir_entry); + int FsRemoveDir(struct inode *inode, FILE_ID_T *fid); + +/* debug functions */ +s32 FsReleaseCache(struct super_block *sb); + +#endif /* _EXFAT_API_H */ diff --git a/fs/exfat/exfat_bitmap.c b/fs/exfat/exfat_bitmap.c new file mode 100644 index 0000000000000000..b0672dd073fcfddb --- /dev/null +++ b/fs/exfat/exfat_bitmap.c @@ -0,0 +1,63 @@ +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +/************************************************************************/ +/* */ +/* PROJECT : exFAT & FAT12/16/32 File System */ +/* FILE : exfat_global.c */ +/* PURPOSE : exFAT Miscellaneous Functions */ +/* */ +/*----------------------------------------------------------------------*/ +/* NOTES */ +/* */ +/*----------------------------------------------------------------------*/ +/* REVISION HISTORY (Ver 0.9) */ +/* */ +/* - 2010.11.15 [Joosun Hahn] : first writing */ +/* */ +/************************************************************************/ + +#include "exfat_config.h" +#include "exfat_bitmap.h" + +/*----------------------------------------------------------------------*/ +/* Bitmap Manipulation Functions */ +/*----------------------------------------------------------------------*/ + +#define BITMAP_LOC(v) ((v) >> 3) +#define BITMAP_SHIFT(v) ((v) & 0x07) + +s32 exfat_bitmap_test(u8 *bitmap, int i) +{ + u8 data; + + data = bitmap[BITMAP_LOC(i)]; + if ((data >> BITMAP_SHIFT(i)) & 0x01) + return 1; + return 0; +} /* end of Bitmap_test */ + +void exfat_bitmap_set(u8 *bitmap, int i) +{ + bitmap[BITMAP_LOC(i)] |= (0x01 << BITMAP_SHIFT(i)); +} /* end of Bitmap_set */ + +void exfat_bitmap_clear(u8 *bitmap, int i) +{ + bitmap[BITMAP_LOC(i)] &= ~(0x01 << BITMAP_SHIFT(i)); +} /* end of Bitmap_clear */ diff --git a/fs/exfat/exfat_bitmap.h b/fs/exfat/exfat_bitmap.h new file mode 100644 index 0000000000000000..4f482c7b28ccc6ab --- /dev/null +++ b/fs/exfat/exfat_bitmap.h @@ -0,0 +1,55 @@ +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +/************************************************************************/ +/* */ +/* PROJECT : exFAT & FAT12/16/32 File System */ +/* FILE : exfat_global.h */ +/* PURPOSE : Header File for exFAT Global Definitions & Misc Functions */ +/* */ +/*----------------------------------------------------------------------*/ +/* NOTES */ +/* */ +/*----------------------------------------------------------------------*/ +/* REVISION HISTORY (Ver 0.9) */ +/* */ +/* - 2010.11.15 [Joosun Hahn] : first writing */ +/* */ +/************************************************************************/ + +#ifndef _EXFAT_BITMAP_H +#define _EXFAT_BITMAP_H + +#include + +/*======================================================================*/ +/* */ +/* LIBRARY FUNCTION DECLARATIONS -- OTHER UTILITY FUNCTIONS */ +/* (DO NOT CHANGE THIS PART !!) */ +/* */ +/*======================================================================*/ + +/*----------------------------------------------------------------------*/ +/* Bitmap Manipulation Functions */ +/*----------------------------------------------------------------------*/ + +s32 exfat_bitmap_test(u8 *bitmap, int i); +void exfat_bitmap_set(u8 *bitmap, int i); +void exfat_bitmap_clear(u8 *bitmpa, int i); + +#endif /* _EXFAT_BITMAP_H */ diff --git a/fs/exfat/exfat_blkdev.c b/fs/exfat/exfat_blkdev.c new file mode 100644 index 0000000000000000..eaccfd84e9f9bf12 --- /dev/null +++ b/fs/exfat/exfat_blkdev.c @@ -0,0 +1,197 @@ +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +/************************************************************************/ +/* */ +/* PROJECT : exFAT & FAT12/16/32 File System */ +/* FILE : exfat_blkdev.c */ +/* PURPOSE : exFAT Block Device Driver Glue Layer */ +/* */ +/*----------------------------------------------------------------------*/ +/* NOTES */ +/* */ +/*----------------------------------------------------------------------*/ +/* REVISION HISTORY (Ver 0.9) */ +/* */ +/* - 2010.11.15 [Joosun Hahn] : first writing */ +/* */ +/************************************************************************/ + +#include +#include +#include "exfat_config.h" +#include "exfat_blkdev.h" +#include "exfat_data.h" +#include "exfat_api.h" +#include "exfat_super.h" + +/*----------------------------------------------------------------------*/ +/* Constant & Macro Definitions */ +/*----------------------------------------------------------------------*/ + +/*----------------------------------------------------------------------*/ +/* Global Variable Definitions */ +/*----------------------------------------------------------------------*/ + +/*----------------------------------------------------------------------*/ +/* Local Variable Definitions */ +/*----------------------------------------------------------------------*/ + +/*======================================================================*/ +/* Function Definitions */ +/*======================================================================*/ + +s32 bdev_init(void) +{ + return FFS_SUCCESS; +} + +s32 bdev_shutdown(void) +{ + return FFS_SUCCESS; +} + +s32 bdev_open(struct super_block *sb) +{ + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + + if (p_bd->opened) + return FFS_SUCCESS; + + p_bd->sector_size = bdev_logical_block_size(sb->s_bdev); + p_bd->sector_size_bits = ilog2(p_bd->sector_size); + p_bd->sector_size_mask = p_bd->sector_size - 1; + p_bd->num_sectors = i_size_read(sb->s_bdev->bd_inode) >> p_bd->sector_size_bits; + + p_bd->opened = TRUE; + + return FFS_SUCCESS; +} + +s32 bdev_close(struct super_block *sb) +{ + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + + if (!p_bd->opened) + return FFS_SUCCESS; + + p_bd->opened = FALSE; + return FFS_SUCCESS; +} + +s32 bdev_read(struct super_block *sb, sector_t secno, struct buffer_head **bh, u32 num_secs, s32 read) +{ + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); +#ifdef CONFIG_EXFAT_KERNEL_DEBUG + struct exfat_sb_info *sbi = EXFAT_SB(sb); + long flags = sbi->debug_flags; + + if (flags & EXFAT_DEBUGFLAGS_ERROR_RW) + return FFS_MEDIAERR; +#endif /* CONFIG_EXFAT_KERNEL_DEBUG */ + + if (!p_bd->opened) + return FFS_MEDIAERR; + + if (*bh) + __brelse(*bh); + + if (read) + *bh = __bread(sb->s_bdev, secno, num_secs << p_bd->sector_size_bits); + else + *bh = __getblk(sb->s_bdev, secno, num_secs << p_bd->sector_size_bits); + + if (*bh) + return FFS_SUCCESS; + + WARN(!p_fs->dev_ejected, + "[EXFAT] No bh, device seems wrong or to be ejected.\n"); + + return FFS_MEDIAERR; +} + +s32 bdev_write(struct super_block *sb, sector_t secno, struct buffer_head *bh, u32 num_secs, s32 sync) +{ + s32 count; + struct buffer_head *bh2; + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); +#ifdef CONFIG_EXFAT_KERNEL_DEBUG + struct exfat_sb_info *sbi = EXFAT_SB(sb); + long flags = sbi->debug_flags; + + if (flags & EXFAT_DEBUGFLAGS_ERROR_RW) + return FFS_MEDIAERR; +#endif /* CONFIG_EXFAT_KERNEL_DEBUG */ + + if (!p_bd->opened) + return FFS_MEDIAERR; + + if (secno == bh->b_blocknr) { + lock_buffer(bh); + set_buffer_uptodate(bh); + mark_buffer_dirty(bh); + unlock_buffer(bh); + if (sync && (sync_dirty_buffer(bh) != 0)) + return FFS_MEDIAERR; + } else { + count = num_secs << p_bd->sector_size_bits; + + bh2 = __getblk(sb->s_bdev, secno, count); + + if (bh2 == NULL) + goto no_bh; + + lock_buffer(bh2); + memcpy(bh2->b_data, bh->b_data, count); + set_buffer_uptodate(bh2); + mark_buffer_dirty(bh2); + unlock_buffer(bh2); + if (sync && (sync_dirty_buffer(bh2) != 0)) { + __brelse(bh2); + goto no_bh; + } + __brelse(bh2); + } + + return FFS_SUCCESS; + +no_bh: + WARN(!p_fs->dev_ejected, + "[EXFAT] No bh, device seems wrong or to be ejected.\n"); + + return FFS_MEDIAERR; +} + +s32 bdev_sync(struct super_block *sb) +{ + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); +#ifdef CONFIG_EXFAT_KERNEL_DEBUG + struct exfat_sb_info *sbi = EXFAT_SB(sb); + long flags = sbi->debug_flags; + + if (flags & EXFAT_DEBUGFLAGS_ERROR_RW) + return FFS_MEDIAERR; +#endif /* CONFIG_EXFAT_KERNEL_DEBUG */ + + if (!p_bd->opened) + return FFS_MEDIAERR; + + return sync_blockdev(sb->s_bdev); +} diff --git a/fs/exfat/exfat_blkdev.h b/fs/exfat/exfat_blkdev.h new file mode 100644 index 0000000000000000..3363b591caebca46 --- /dev/null +++ b/fs/exfat/exfat_blkdev.h @@ -0,0 +1,73 @@ +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +/************************************************************************/ +/* */ +/* PROJECT : exFAT & FAT12/16/32 File System */ +/* FILE : exfat_blkdev.h */ +/* PURPOSE : Header File for exFAT Block Device Driver Glue Layer */ +/* */ +/*----------------------------------------------------------------------*/ +/* NOTES */ +/* */ +/*----------------------------------------------------------------------*/ +/* REVISION HISTORY (Ver 0.9) */ +/* */ +/* - 2010.11.15 [Joosun Hahn] : first writing */ +/* */ +/************************************************************************/ + +#ifndef _EXFAT_BLKDEV_H +#define _EXFAT_BLKDEV_H + +#include +#include "exfat_config.h" + +/*----------------------------------------------------------------------*/ +/* Constant & Macro Definitions (Non-Configurable) */ +/*----------------------------------------------------------------------*/ + +/*----------------------------------------------------------------------*/ +/* Type Definitions */ +/*----------------------------------------------------------------------*/ + +typedef struct __BD_INFO_T { + s32 sector_size; /* in bytes */ + s32 sector_size_bits; + s32 sector_size_mask; + s32 num_sectors; /* total number of sectors in this block device */ + bool opened; /* opened or not */ +} BD_INFO_T; + +/*----------------------------------------------------------------------*/ +/* External Variable Declarations */ +/*----------------------------------------------------------------------*/ + +/*----------------------------------------------------------------------*/ +/* External Function Declarations */ +/*----------------------------------------------------------------------*/ + +s32 bdev_init(void); +s32 bdev_shutdown(void); +s32 bdev_open(struct super_block *sb); +s32 bdev_close(struct super_block *sb); +s32 bdev_read(struct super_block *sb, sector_t secno, struct buffer_head **bh, u32 num_secs, s32 read); +s32 bdev_write(struct super_block *sb, sector_t secno, struct buffer_head *bh, u32 num_secs, s32 sync); +s32 bdev_sync(struct super_block *sb); + +#endif /* _EXFAT_BLKDEV_H */ diff --git a/fs/exfat/exfat_cache.c b/fs/exfat/exfat_cache.c new file mode 100644 index 0000000000000000..4130102e373929de --- /dev/null +++ b/fs/exfat/exfat_cache.c @@ -0,0 +1,784 @@ +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +/************************************************************************/ +/* */ +/* PROJECT : exFAT & FAT12/16/32 File System */ +/* FILE : exfat_cache.c */ +/* PURPOSE : exFAT Cache Manager */ +/* (FAT Cache & Buffer Cache) */ +/* */ +/*----------------------------------------------------------------------*/ +/* NOTES */ +/* */ +/*----------------------------------------------------------------------*/ +/* REVISION HISTORY (Ver 0.9) */ +/* */ +/* - 2010.11.15 [Sung-Kwan Kim] : first writing */ +/* */ +/************************************************************************/ + +#include "exfat_config.h" +#include "exfat_data.h" + +#include "exfat_cache.h" +#include "exfat_super.h" +#include "exfat_core.h" + +/*----------------------------------------------------------------------*/ +/* Global Variable Definitions */ +/*----------------------------------------------------------------------*/ + +#define sm_P(s) +#define sm_V(s) + +static s32 __FAT_read(struct super_block *sb, u32 loc, u32 *content); +static s32 __FAT_write(struct super_block *sb, u32 loc, u32 content); + +static BUF_CACHE_T *FAT_cache_find(struct super_block *sb, sector_t sec); +static BUF_CACHE_T *FAT_cache_get(struct super_block *sb, sector_t sec); +static void FAT_cache_insert_hash(struct super_block *sb, BUF_CACHE_T *bp); +static void FAT_cache_remove_hash(BUF_CACHE_T *bp); + +static u8 *__buf_getblk(struct super_block *sb, sector_t sec); + +static BUF_CACHE_T *buf_cache_find(struct super_block *sb, sector_t sec); +static BUF_CACHE_T *buf_cache_get(struct super_block *sb, sector_t sec); +static void buf_cache_insert_hash(struct super_block *sb, BUF_CACHE_T *bp); +static void buf_cache_remove_hash(BUF_CACHE_T *bp); + +static void push_to_mru(BUF_CACHE_T *bp, BUF_CACHE_T *list); +static void push_to_lru(BUF_CACHE_T *bp, BUF_CACHE_T *list); +static void move_to_mru(BUF_CACHE_T *bp, BUF_CACHE_T *list); +static void move_to_lru(BUF_CACHE_T *bp, BUF_CACHE_T *list); + +/*======================================================================*/ +/* Cache Initialization Functions */ +/*======================================================================*/ + +s32 buf_init(struct super_block *sb) +{ + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + int i; + + /* LRU list */ + p_fs->FAT_cache_lru_list.next = p_fs->FAT_cache_lru_list.prev = &p_fs->FAT_cache_lru_list; + + for (i = 0; i < FAT_CACHE_SIZE; i++) { + p_fs->FAT_cache_array[i].drv = -1; + p_fs->FAT_cache_array[i].sec = ~0; + p_fs->FAT_cache_array[i].flag = 0; + p_fs->FAT_cache_array[i].buf_bh = NULL; + p_fs->FAT_cache_array[i].prev = p_fs->FAT_cache_array[i].next = NULL; + push_to_mru(&(p_fs->FAT_cache_array[i]), &p_fs->FAT_cache_lru_list); + } + + p_fs->buf_cache_lru_list.next = p_fs->buf_cache_lru_list.prev = &p_fs->buf_cache_lru_list; + + for (i = 0; i < BUF_CACHE_SIZE; i++) { + p_fs->buf_cache_array[i].drv = -1; + p_fs->buf_cache_array[i].sec = ~0; + p_fs->buf_cache_array[i].flag = 0; + p_fs->buf_cache_array[i].buf_bh = NULL; + p_fs->buf_cache_array[i].prev = p_fs->buf_cache_array[i].next = NULL; + push_to_mru(&(p_fs->buf_cache_array[i]), &p_fs->buf_cache_lru_list); + } + + /* HASH list */ + for (i = 0; i < FAT_CACHE_HASH_SIZE; i++) { + p_fs->FAT_cache_hash_list[i].drv = -1; + p_fs->FAT_cache_hash_list[i].sec = ~0; + p_fs->FAT_cache_hash_list[i].hash_next = p_fs->FAT_cache_hash_list[i].hash_prev = &(p_fs->FAT_cache_hash_list[i]); + } + + for (i = 0; i < FAT_CACHE_SIZE; i++) + FAT_cache_insert_hash(sb, &(p_fs->FAT_cache_array[i])); + + for (i = 0; i < BUF_CACHE_HASH_SIZE; i++) { + p_fs->buf_cache_hash_list[i].drv = -1; + p_fs->buf_cache_hash_list[i].sec = ~0; + p_fs->buf_cache_hash_list[i].hash_next = p_fs->buf_cache_hash_list[i].hash_prev = &(p_fs->buf_cache_hash_list[i]); + } + + for (i = 0; i < BUF_CACHE_SIZE; i++) + buf_cache_insert_hash(sb, &(p_fs->buf_cache_array[i])); + + return FFS_SUCCESS; +} /* end of buf_init */ + +s32 buf_shutdown(struct super_block *sb) +{ + return FFS_SUCCESS; +} /* end of buf_shutdown */ + +/*======================================================================*/ +/* FAT Read/Write Functions */ +/*======================================================================*/ + +/* in : sb, loc + * out: content + * returns 0 on success + * -1 on error + */ +s32 FAT_read(struct super_block *sb, u32 loc, u32 *content) +{ + s32 ret; + + sm_P(&f_sem); + + ret = __FAT_read(sb, loc, content); + + sm_V(&f_sem); + + return ret; +} /* end of FAT_read */ + +s32 FAT_write(struct super_block *sb, u32 loc, u32 content) +{ + s32 ret; + + sm_P(&f_sem); + + ret = __FAT_write(sb, loc, content); + + sm_V(&f_sem); + + return ret; +} /* end of FAT_write */ + +static s32 __FAT_read(struct super_block *sb, u32 loc, u32 *content) +{ + s32 off; + u32 _content; + sector_t sec; + u8 *fat_sector, *fat_entry; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + + if (p_fs->vol_type == FAT12) { + sec = p_fs->FAT1_start_sector + ((loc + (loc >> 1)) >> p_bd->sector_size_bits); + off = (loc + (loc >> 1)) & p_bd->sector_size_mask; + + if (off == (p_bd->sector_size-1)) { + fat_sector = FAT_getblk(sb, sec); + if (!fat_sector) + return -1; + + _content = (u32) fat_sector[off]; + + fat_sector = FAT_getblk(sb, ++sec); + if (!fat_sector) + return -1; + + _content |= (u32) fat_sector[0] << 8; + } else { + fat_sector = FAT_getblk(sb, sec); + if (!fat_sector) + return -1; + + fat_entry = &(fat_sector[off]); + _content = GET16(fat_entry); + } + + if (loc & 1) + _content >>= 4; + + _content &= 0x00000FFF; + + if (_content >= CLUSTER_16(0x0FF8)) { + *content = CLUSTER_32(~0); + return 0; + } else { + *content = CLUSTER_32(_content); + return 0; + } + } else if (p_fs->vol_type == FAT16) { + sec = p_fs->FAT1_start_sector + (loc >> (p_bd->sector_size_bits-1)); + off = (loc << 1) & p_bd->sector_size_mask; + + fat_sector = FAT_getblk(sb, sec); + if (!fat_sector) + return -1; + + fat_entry = &(fat_sector[off]); + + _content = GET16_A(fat_entry); + + _content &= 0x0000FFFF; + + if (_content >= CLUSTER_16(0xFFF8)) { + *content = CLUSTER_32(~0); + return 0; + } else { + *content = CLUSTER_32(_content); + return 0; + } + } else if (p_fs->vol_type == FAT32) { + sec = p_fs->FAT1_start_sector + (loc >> (p_bd->sector_size_bits-2)); + off = (loc << 2) & p_bd->sector_size_mask; + + fat_sector = FAT_getblk(sb, sec); + if (!fat_sector) + return -1; + + fat_entry = &(fat_sector[off]); + + _content = GET32_A(fat_entry); + + _content &= 0x0FFFFFFF; + + if (_content >= CLUSTER_32(0x0FFFFFF8)) { + *content = CLUSTER_32(~0); + return 0; + } else { + *content = CLUSTER_32(_content); + return 0; + } + } else { + sec = p_fs->FAT1_start_sector + (loc >> (p_bd->sector_size_bits-2)); + off = (loc << 2) & p_bd->sector_size_mask; + + fat_sector = FAT_getblk(sb, sec); + if (!fat_sector) + return -1; + + fat_entry = &(fat_sector[off]); + _content = GET32_A(fat_entry); + + if (_content >= CLUSTER_32(0xFFFFFFF8)) { + *content = CLUSTER_32(~0); + return 0; + } else { + *content = CLUSTER_32(_content); + return 0; + } + } + + *content = CLUSTER_32(~0); + return 0; +} /* end of __FAT_read */ + +static s32 __FAT_write(struct super_block *sb, u32 loc, u32 content) +{ + s32 off; + sector_t sec; + u8 *fat_sector, *fat_entry; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + + if (p_fs->vol_type == FAT12) { + + content &= 0x00000FFF; + + sec = p_fs->FAT1_start_sector + ((loc + (loc >> 1)) >> p_bd->sector_size_bits); + off = (loc + (loc >> 1)) & p_bd->sector_size_mask; + + fat_sector = FAT_getblk(sb, sec); + if (!fat_sector) + return -1; + + if (loc & 1) { /* odd */ + + content <<= 4; + + if (off == (p_bd->sector_size-1)) { + fat_sector[off] = (u8)(content | (fat_sector[off] & 0x0F)); + FAT_modify(sb, sec); + + fat_sector = FAT_getblk(sb, ++sec); + if (!fat_sector) + return -1; + + fat_sector[0] = (u8)(content >> 8); + } else { + fat_entry = &(fat_sector[off]); + content |= GET16(fat_entry) & 0x000F; + + SET16(fat_entry, content); + } + } else { /* even */ + fat_sector[off] = (u8)(content); + + if (off == (p_bd->sector_size-1)) { + fat_sector[off] = (u8)(content); + FAT_modify(sb, sec); + + fat_sector = FAT_getblk(sb, ++sec); + fat_sector[0] = (u8)((fat_sector[0] & 0xF0) | (content >> 8)); + } else { + fat_entry = &(fat_sector[off]); + content |= GET16(fat_entry) & 0xF000; + + SET16(fat_entry, content); + } + } + } + + else if (p_fs->vol_type == FAT16) { + + content &= 0x0000FFFF; + + sec = p_fs->FAT1_start_sector + (loc >> (p_bd->sector_size_bits-1)); + off = (loc << 1) & p_bd->sector_size_mask; + + fat_sector = FAT_getblk(sb, sec); + if (!fat_sector) + return -1; + + fat_entry = &(fat_sector[off]); + + SET16_A(fat_entry, content); + } + + else if (p_fs->vol_type == FAT32) { + + content &= 0x0FFFFFFF; + + sec = p_fs->FAT1_start_sector + (loc >> (p_bd->sector_size_bits-2)); + off = (loc << 2) & p_bd->sector_size_mask; + + fat_sector = FAT_getblk(sb, sec); + if (!fat_sector) + return -1; + + fat_entry = &(fat_sector[off]); + + content |= GET32_A(fat_entry) & 0xF0000000; + + SET32_A(fat_entry, content); + } + + else { /* p_fs->vol_type == EXFAT */ + + sec = p_fs->FAT1_start_sector + (loc >> (p_bd->sector_size_bits-2)); + off = (loc << 2) & p_bd->sector_size_mask; + + fat_sector = FAT_getblk(sb, sec); + if (!fat_sector) + return -1; + + fat_entry = &(fat_sector[off]); + + SET32_A(fat_entry, content); + } + + FAT_modify(sb, sec); + return 0; +} /* end of __FAT_write */ + +u8 *FAT_getblk(struct super_block *sb, sector_t sec) +{ + BUF_CACHE_T *bp; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + bp = FAT_cache_find(sb, sec); + if (bp != NULL) { + move_to_mru(bp, &p_fs->FAT_cache_lru_list); + return bp->buf_bh->b_data; + } + + bp = FAT_cache_get(sb, sec); + + FAT_cache_remove_hash(bp); + + bp->drv = p_fs->drv; + bp->sec = sec; + bp->flag = 0; + + FAT_cache_insert_hash(sb, bp); + + if (sector_read(sb, sec, &(bp->buf_bh), 1) != FFS_SUCCESS) { + FAT_cache_remove_hash(bp); + bp->drv = -1; + bp->sec = ~0; + bp->flag = 0; + bp->buf_bh = NULL; + + move_to_lru(bp, &p_fs->FAT_cache_lru_list); + return NULL; + } + + return bp->buf_bh->b_data; +} /* end of FAT_getblk */ + +void FAT_modify(struct super_block *sb, sector_t sec) +{ + BUF_CACHE_T *bp; + + bp = FAT_cache_find(sb, sec); + if (bp != NULL) + sector_write(sb, sec, bp->buf_bh, 0); +} /* end of FAT_modify */ + +void FAT_release_all(struct super_block *sb) +{ + BUF_CACHE_T *bp; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + sm_P(&f_sem); + + bp = p_fs->FAT_cache_lru_list.next; + while (bp != &p_fs->FAT_cache_lru_list) { + if (bp->drv == p_fs->drv) { + bp->drv = -1; + bp->sec = ~0; + bp->flag = 0; + + if (bp->buf_bh) { + __brelse(bp->buf_bh); + bp->buf_bh = NULL; + } + } + bp = bp->next; + } + + sm_V(&f_sem); +} /* end of FAT_release_all */ + +void FAT_sync(struct super_block *sb) +{ + BUF_CACHE_T *bp; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + sm_P(&f_sem); + + bp = p_fs->FAT_cache_lru_list.next; + while (bp != &p_fs->FAT_cache_lru_list) { + if ((bp->drv == p_fs->drv) && (bp->flag & DIRTYBIT)) { + sync_dirty_buffer(bp->buf_bh); + bp->flag &= ~(DIRTYBIT); + } + bp = bp->next; + } + + sm_V(&f_sem); +} /* end of FAT_sync */ + +static BUF_CACHE_T *FAT_cache_find(struct super_block *sb, sector_t sec) +{ + s32 off; + BUF_CACHE_T *bp, *hp; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + off = (sec + (sec >> p_fs->sectors_per_clu_bits)) & (FAT_CACHE_HASH_SIZE - 1); + + hp = &(p_fs->FAT_cache_hash_list[off]); + for (bp = hp->hash_next; bp != hp; bp = bp->hash_next) { + if ((bp->drv == p_fs->drv) && (bp->sec == sec)) { + + WARN(!bp->buf_bh, "[EXFAT] FAT_cache has no bh. " + "It will make system panic.\n"); + + touch_buffer(bp->buf_bh); + return bp; + } + } + return NULL; +} /* end of FAT_cache_find */ + +static BUF_CACHE_T *FAT_cache_get(struct super_block *sb, sector_t sec) +{ + BUF_CACHE_T *bp; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + bp = p_fs->FAT_cache_lru_list.prev; + + + move_to_mru(bp, &p_fs->FAT_cache_lru_list); + return bp; +} /* end of FAT_cache_get */ + +static void FAT_cache_insert_hash(struct super_block *sb, BUF_CACHE_T *bp) +{ + s32 off; + BUF_CACHE_T *hp; + FS_INFO_T *p_fs; + + p_fs = &(EXFAT_SB(sb)->fs_info); + off = (bp->sec + (bp->sec >> p_fs->sectors_per_clu_bits)) & (FAT_CACHE_HASH_SIZE-1); + + hp = &(p_fs->FAT_cache_hash_list[off]); + bp->hash_next = hp->hash_next; + bp->hash_prev = hp; + hp->hash_next->hash_prev = bp; + hp->hash_next = bp; +} /* end of FAT_cache_insert_hash */ + +static void FAT_cache_remove_hash(BUF_CACHE_T *bp) +{ + (bp->hash_prev)->hash_next = bp->hash_next; + (bp->hash_next)->hash_prev = bp->hash_prev; +} /* end of FAT_cache_remove_hash */ + +/*======================================================================*/ +/* Buffer Read/Write Functions */ +/*======================================================================*/ + +u8 *buf_getblk(struct super_block *sb, sector_t sec) +{ + u8 *buf; + + sm_P(&b_sem); + + buf = __buf_getblk(sb, sec); + + sm_V(&b_sem); + + return buf; +} /* end of buf_getblk */ + +static u8 *__buf_getblk(struct super_block *sb, sector_t sec) +{ + BUF_CACHE_T *bp; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + bp = buf_cache_find(sb, sec); + if (bp != NULL) { + move_to_mru(bp, &p_fs->buf_cache_lru_list); + return bp->buf_bh->b_data; + } + + bp = buf_cache_get(sb, sec); + + buf_cache_remove_hash(bp); + + bp->drv = p_fs->drv; + bp->sec = sec; + bp->flag = 0; + + buf_cache_insert_hash(sb, bp); + + if (sector_read(sb, sec, &(bp->buf_bh), 1) != FFS_SUCCESS) { + buf_cache_remove_hash(bp); + bp->drv = -1; + bp->sec = ~0; + bp->flag = 0; + bp->buf_bh = NULL; + + move_to_lru(bp, &p_fs->buf_cache_lru_list); + return NULL; + } + + return bp->buf_bh->b_data; + +} /* end of __buf_getblk */ + +void buf_modify(struct super_block *sb, sector_t sec) +{ + BUF_CACHE_T *bp; + + sm_P(&b_sem); + + bp = buf_cache_find(sb, sec); + if (likely(bp != NULL)) + sector_write(sb, sec, bp->buf_bh, 0); + + WARN(!bp, "[EXFAT] failed to find buffer_cache(sector:%llu).\n", + (unsigned long long)sec); + + sm_V(&b_sem); +} /* end of buf_modify */ + +void buf_lock(struct super_block *sb, sector_t sec) +{ + BUF_CACHE_T *bp; + + sm_P(&b_sem); + + bp = buf_cache_find(sb, sec); + if (likely(bp != NULL)) + bp->flag |= LOCKBIT; + + WARN(!bp, "[EXFAT] failed to find buffer_cache(sector:%llu).\n", + (unsigned long long)sec); + + sm_V(&b_sem); +} /* end of buf_lock */ + +void buf_unlock(struct super_block *sb, sector_t sec) +{ + BUF_CACHE_T *bp; + + sm_P(&b_sem); + + bp = buf_cache_find(sb, sec); + if (likely(bp != NULL)) + bp->flag &= ~(LOCKBIT); + + WARN(!bp, "[EXFAT] failed to find buffer_cache(sector:%llu).\n", + (unsigned long long)sec); + + sm_V(&b_sem); +} /* end of buf_unlock */ + +void buf_release(struct super_block *sb, sector_t sec) +{ + BUF_CACHE_T *bp; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + sm_P(&b_sem); + + bp = buf_cache_find(sb, sec); + if (likely(bp != NULL)) { + bp->drv = -1; + bp->sec = ~0; + bp->flag = 0; + + if (bp->buf_bh) { + __brelse(bp->buf_bh); + bp->buf_bh = NULL; + } + + move_to_lru(bp, &p_fs->buf_cache_lru_list); + } + + sm_V(&b_sem); +} /* end of buf_release */ + +void buf_release_all(struct super_block *sb) +{ + BUF_CACHE_T *bp; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + sm_P(&b_sem); + + bp = p_fs->buf_cache_lru_list.next; + while (bp != &p_fs->buf_cache_lru_list) { + if (bp->drv == p_fs->drv) { + bp->drv = -1; + bp->sec = ~0; + bp->flag = 0; + + if (bp->buf_bh) { + __brelse(bp->buf_bh); + bp->buf_bh = NULL; + } + } + bp = bp->next; + } + + sm_V(&b_sem); +} /* end of buf_release_all */ + +void buf_sync(struct super_block *sb) +{ + BUF_CACHE_T *bp; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + sm_P(&b_sem); + + bp = p_fs->buf_cache_lru_list.next; + while (bp != &p_fs->buf_cache_lru_list) { + if ((bp->drv == p_fs->drv) && (bp->flag & DIRTYBIT)) { + sync_dirty_buffer(bp->buf_bh); + bp->flag &= ~(DIRTYBIT); + } + bp = bp->next; + } + + sm_V(&b_sem); +} /* end of buf_sync */ + +static BUF_CACHE_T *buf_cache_find(struct super_block *sb, sector_t sec) +{ + s32 off; + BUF_CACHE_T *bp, *hp; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + off = (sec + (sec >> p_fs->sectors_per_clu_bits)) & (BUF_CACHE_HASH_SIZE - 1); + + hp = &(p_fs->buf_cache_hash_list[off]); + for (bp = hp->hash_next; bp != hp; bp = bp->hash_next) { + if ((bp->drv == p_fs->drv) && (bp->sec == sec)) { + touch_buffer(bp->buf_bh); + return bp; + } + } + return NULL; +} /* end of buf_cache_find */ + +static BUF_CACHE_T *buf_cache_get(struct super_block *sb, sector_t sec) +{ + BUF_CACHE_T *bp; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + bp = p_fs->buf_cache_lru_list.prev; + while (bp->flag & LOCKBIT) + bp = bp->prev; + + + move_to_mru(bp, &p_fs->buf_cache_lru_list); + return bp; +} /* end of buf_cache_get */ + +static void buf_cache_insert_hash(struct super_block *sb, BUF_CACHE_T *bp) +{ + s32 off; + BUF_CACHE_T *hp; + FS_INFO_T *p_fs; + + p_fs = &(EXFAT_SB(sb)->fs_info); + off = (bp->sec + (bp->sec >> p_fs->sectors_per_clu_bits)) & (BUF_CACHE_HASH_SIZE-1); + + hp = &(p_fs->buf_cache_hash_list[off]); + bp->hash_next = hp->hash_next; + bp->hash_prev = hp; + hp->hash_next->hash_prev = bp; + hp->hash_next = bp; +} /* end of buf_cache_insert_hash */ + +static void buf_cache_remove_hash(BUF_CACHE_T *bp) +{ + (bp->hash_prev)->hash_next = bp->hash_next; + (bp->hash_next)->hash_prev = bp->hash_prev; +} /* end of buf_cache_remove_hash */ + +/*======================================================================*/ +/* Local Function Definitions */ +/*======================================================================*/ + +static void push_to_mru(BUF_CACHE_T *bp, BUF_CACHE_T *list) +{ + bp->next = list->next; + bp->prev = list; + list->next->prev = bp; + list->next = bp; +} /* end of buf_cache_push_to_mru */ + +static void push_to_lru(BUF_CACHE_T *bp, BUF_CACHE_T *list) +{ + bp->prev = list->prev; + bp->next = list; + list->prev->next = bp; + list->prev = bp; +} /* end of buf_cache_push_to_lru */ + +static void move_to_mru(BUF_CACHE_T *bp, BUF_CACHE_T *list) +{ + bp->prev->next = bp->next; + bp->next->prev = bp->prev; + push_to_mru(bp, list); +} /* end of buf_cache_move_to_mru */ + +static void move_to_lru(BUF_CACHE_T *bp, BUF_CACHE_T *list) +{ + bp->prev->next = bp->next; + bp->next->prev = bp->prev; + push_to_lru(bp, list); +} /* end of buf_cache_move_to_lru */ diff --git a/fs/exfat/exfat_cache.h b/fs/exfat/exfat_cache.h new file mode 100644 index 0000000000000000..540e31681d047078 --- /dev/null +++ b/fs/exfat/exfat_cache.h @@ -0,0 +1,85 @@ +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +/************************************************************************/ +/* */ +/* PROJECT : exFAT & FAT12/16/32 File System */ +/* FILE : exfat_cache.h */ +/* PURPOSE : Header File for exFAT Cache Manager */ +/* (FAT Cache & Buffer Cache) */ +/* */ +/*----------------------------------------------------------------------*/ +/* NOTES */ +/* */ +/*----------------------------------------------------------------------*/ +/* REVISION HISTORY (Ver 0.9) */ +/* */ +/* - 2010.11.15 [Sung-Kwan Kim] : first writing */ +/* */ +/************************************************************************/ + +#ifndef _EXFAT_CACHE_H +#define _EXFAT_CACHE_H + +#include +#include +#include "exfat_config.h" + +/*----------------------------------------------------------------------*/ +/* Constant & Macro Definitions */ +/*----------------------------------------------------------------------*/ + +#define LOCKBIT 0x01 +#define DIRTYBIT 0x02 + +/*----------------------------------------------------------------------*/ +/* Type Definitions */ +/*----------------------------------------------------------------------*/ + +typedef struct __BUF_CACHE_T { + struct __BUF_CACHE_T *next; + struct __BUF_CACHE_T *prev; + struct __BUF_CACHE_T *hash_next; + struct __BUF_CACHE_T *hash_prev; + s32 drv; + sector_t sec; + u32 flag; + struct buffer_head *buf_bh; +} BUF_CACHE_T; + +/*----------------------------------------------------------------------*/ +/* External Function Declarations */ +/*----------------------------------------------------------------------*/ + +s32 buf_init(struct super_block *sb); +s32 buf_shutdown(struct super_block *sb); +s32 FAT_read(struct super_block *sb, u32 loc, u32 *content); +s32 FAT_write(struct super_block *sb, u32 loc, u32 content); +u8 *FAT_getblk(struct super_block *sb, sector_t sec); +void FAT_modify(struct super_block *sb, sector_t sec); +void FAT_release_all(struct super_block *sb); +void FAT_sync(struct super_block *sb); +u8 *buf_getblk(struct super_block *sb, sector_t sec); +void buf_modify(struct super_block *sb, sector_t sec); +void buf_lock(struct super_block *sb, sector_t sec); +void buf_unlock(struct super_block *sb, sector_t sec); +void buf_release(struct super_block *sb, sector_t sec); +void buf_release_all(struct super_block *sb); +void buf_sync(struct super_block *sb); + +#endif /* _EXFAT_CACHE_H */ diff --git a/fs/exfat/exfat_config.h b/fs/exfat/exfat_config.h new file mode 100644 index 0000000000000000..33c6525e449bdf05 --- /dev/null +++ b/fs/exfat/exfat_config.h @@ -0,0 +1,69 @@ +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +/************************************************************************/ +/* */ +/* PROJECT : exFAT & FAT12/16/32 File System */ +/* FILE : exfat_config.h */ +/* PURPOSE : Header File for exFAT Configuable Policies */ +/* */ +/*----------------------------------------------------------------------*/ +/* NOTES */ +/* */ +/*----------------------------------------------------------------------*/ +/* REVISION HISTORY (Ver 0.9) */ +/* */ +/* - 2010.11.15 [Joosun Hahn] : first writing */ +/* */ +/************************************************************************/ + +#ifndef _EXFAT_CONFIG_H +#define _EXFAT_CONFIG_H + +/*======================================================================*/ +/* */ +/* FFS CONFIGURATIONS */ +/* (CHANGE THIS PART IF REQUIRED) */ +/* */ +/*======================================================================*/ + +/*----------------------------------------------------------------------*/ +/* Feature Config */ +/*----------------------------------------------------------------------*/ +#ifndef CONFIG_EXFAT_DISCARD +#define CONFIG_EXFAT_DISCARD 1 /* mount option -o discard support */ +#endif + +#ifndef CONFIG_EXFAT_DELAYED_SYNC +#define CONFIG_EXFAT_DELAYED_SYNC 0 +#endif + +#ifndef CONFIG_EXFAT_KERNEL_DEBUG +#define CONFIG_EXFAT_KERNEL_DEBUG 1 /* kernel debug features via ioctl */ +#endif + +#ifndef CONFIG_EXFAT_DEBUG_MSG +#define CONFIG_EXFAT_DEBUG_MSG 0 /* debugging message on/off */ +#endif + +#ifndef CONFIG_EXFAT_DEFAULT_CODEPAGE +#define CONFIG_EXFAT_DEFAULT_CODEPAGE 437 +#define CONFIG_EXFAT_DEFAULT_IOCHARSET "utf8" +#endif + +#endif /* _EXFAT_CONFIG_H */ diff --git a/fs/exfat/exfat_core.c b/fs/exfat/exfat_core.c new file mode 100644 index 0000000000000000..143b72155ef9e075 --- /dev/null +++ b/fs/exfat/exfat_core.c @@ -0,0 +1,5138 @@ +/* Some of the source code in this file came from "linux/fs/fat/misc.c". */ +/* + * linux/fs/fat/misc.c + * + * Written 1992,1993 by Werner Almesberger + * 22/11/2000 - Fixed fat_date_unix2dos for dates earlier than 01/01/1980 + * and date_dos2unix for date==0 by Igor Zhbanov(bsg@uniyar.ac.ru) + */ + +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +/************************************************************************/ +/* */ +/* PROJECT : exFAT & FAT12/16/32 File System */ +/* FILE : exfat_core.c */ +/* PURPOSE : exFAT File Manager */ +/* */ +/*----------------------------------------------------------------------*/ +/* NOTES */ +/* */ +/*----------------------------------------------------------------------*/ +/* REVISION HISTORY (Ver 0.9) */ +/* */ +/* - 2010.11.15 [Joosun Hahn] : first writing */ +/* */ +/************************************************************************/ + +#include +#include +#include + +#include "exfat_bitmap.h" +#include "exfat_config.h" +#include "exfat_data.h" +#include "exfat_oal.h" +#include "exfat_blkdev.h" +#include "exfat_cache.h" +#include "exfat_nls.h" +#include "exfat_api.h" +#include "exfat_super.h" +#include "exfat_core.h" + +#include +#include + +static void __set_sb_dirty(struct super_block *sb) +{ +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0) + sb->s_dirt = 1; +#else + struct exfat_sb_info *sbi = EXFAT_SB(sb); + sbi->s_dirt = 1; +#endif +} + +/*----------------------------------------------------------------------*/ +/* Global Variable Definitions */ +/*----------------------------------------------------------------------*/ + +extern u8 uni_upcase[]; + +/*----------------------------------------------------------------------*/ +/* Local Variable Definitions */ +/*----------------------------------------------------------------------*/ + +static u8 name_buf[MAX_PATH_LENGTH * MAX_CHARSET_SIZE]; + +static char *reserved_names[] = { + "AUX ", "CON ", "NUL ", "PRN ", + "COM1 ", "COM2 ", "COM3 ", "COM4 ", + "COM5 ", "COM6 ", "COM7 ", "COM8 ", "COM9 ", + "LPT1 ", "LPT2 ", "LPT3 ", "LPT4 ", + "LPT5 ", "LPT6 ", "LPT7 ", "LPT8 ", "LPT9 ", + NULL +}; + +static u8 free_bit[] = { + 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, /* 0 ~ 19 */ + 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, /* 20 ~ 39 */ + 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, /* 40 ~ 59 */ + 0, 1, 0, 6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, /* 60 ~ 79 */ + 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, /* 80 ~ 99 */ + 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, /* 100 ~ 119 */ + 0, 1, 0, 2, 0, 1, 0, 7, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, /* 120 ~ 139 */ + 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, /* 140 ~ 159 */ + 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, /* 160 ~ 179 */ + 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 6, 0, 1, 0, 2, 0, 1, 0, 3, /* 180 ~ 199 */ + 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, /* 200 ~ 219 */ + 0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, /* 220 ~ 239 */ + 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0 /* 240 ~ 254 */ +}; + +static u8 used_bit[] = { + 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4, 1, 2, 2, 3, /* 0 ~ 19 */ + 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 1, 2, 2, 3, 2, 3, 3, 4, /* 20 ~ 39 */ + 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, /* 40 ~ 59 */ + 4, 5, 5, 6, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, /* 60 ~ 79 */ + 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 2, 3, 3, 4, /* 80 ~ 99 */ + 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, /* 100 ~ 119 */ + 4, 5, 5, 6, 5, 6, 6, 7, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, /* 120 ~ 139 */ + 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, /* 140 ~ 159 */ + 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, /* 160 ~ 179 */ + 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 2, 3, 3, 4, 3, 4, 4, 5, /* 180 ~ 199 */ + 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, /* 200 ~ 219 */ + 5, 6, 6, 7, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, /* 220 ~ 239 */ + 4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8 /* 240 ~ 255 */ +}; + +/*======================================================================*/ +/* Global Function Definitions */ +/*======================================================================*/ + +/* ffsInit : roll back to the initial state of the file system */ +s32 ffsInit(void) +{ + s32 ret; + + ret = bdev_init(); + if (ret) + return ret; + + ret = fs_init(); + if (ret) + return ret; + + return FFS_SUCCESS; +} /* end of ffsInit */ + +/* ffsShutdown : make free all memory-alloced global buffers */ +s32 ffsShutdown(void) +{ + s32 ret; + ret = fs_shutdown(); + if (ret) + return ret; + + ret = bdev_shutdown(); + if (ret) + return ret; + + return FFS_SUCCESS; +} /* end of ffsShutdown */ + +/* ffsMountVol : mount the file system volume */ +s32 ffsMountVol(struct super_block *sb) +{ + int i, ret; + PBR_SECTOR_T *p_pbr; + struct buffer_head *tmp_bh = NULL; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + + printk("[EXFAT] trying to mount...\n"); + + sm_init(&p_fs->v_sem); + p_fs->dev_ejected = FALSE; + + /* open the block device */ + if (bdev_open(sb)) + return FFS_MEDIAERR; + + if (p_bd->sector_size < sb->s_blocksize) + return FFS_MEDIAERR; + if (p_bd->sector_size > sb->s_blocksize) + sb_set_blocksize(sb, p_bd->sector_size); + + /* read Sector 0 */ + if (sector_read(sb, 0, &tmp_bh, 1) != FFS_SUCCESS) + return FFS_MEDIAERR; + + p_fs->PBR_sector = 0; + + p_pbr = (PBR_SECTOR_T *) tmp_bh->b_data; + + /* check the validity of PBR */ + if (GET16_A(p_pbr->signature) != PBR_SIGNATURE) { + brelse(tmp_bh); + bdev_close(sb); + return FFS_FORMATERR; + } + + /* fill fs_stuct */ + for (i = 0; i < 53; i++) + if (p_pbr->bpb[i]) + break; + + if (i < 53) { + if (GET16(p_pbr->bpb+11)) /* num_fat_sectors */ + ret = fat16_mount(sb, p_pbr); + else + ret = fat32_mount(sb, p_pbr); + } else { + ret = exfat_mount(sb, p_pbr); + } + + brelse(tmp_bh); + + if (ret) { + bdev_close(sb); + return ret; + } + + if (p_fs->vol_type == EXFAT) { + ret = load_alloc_bitmap(sb); + if (ret) { + bdev_close(sb); + return ret; + } + ret = load_upcase_table(sb); + if (ret) { + free_alloc_bitmap(sb); + bdev_close(sb); + return ret; + } + } + + if (p_fs->dev_ejected) { + if (p_fs->vol_type == EXFAT) { + free_upcase_table(sb); + free_alloc_bitmap(sb); + } + bdev_close(sb); + return FFS_MEDIAERR; + } + + printk("[EXFAT] mounted successfully\n"); + + return FFS_SUCCESS; +} /* end of ffsMountVol */ + +/* ffsUmountVol : umount the file system volume */ +s32 ffsUmountVol(struct super_block *sb) +{ + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + printk("[EXFAT] trying to unmount...\n"); + + fs_sync(sb, 0); + fs_set_vol_flags(sb, VOL_CLEAN); + + if (p_fs->vol_type == EXFAT) { + free_upcase_table(sb); + free_alloc_bitmap(sb); + } + + FAT_release_all(sb); + buf_release_all(sb); + + /* close the block device */ + bdev_close(sb); + + if (p_fs->dev_ejected) { + printk("[EXFAT] unmounted with media errors. " + "device's already ejected.\n"); + return FFS_MEDIAERR; + } + + printk("[EXFAT] unmounted successfully\n"); + + return FFS_SUCCESS; +} /* end of ffsUmountVol */ + +/* ffsGetVolInfo : get the information of a file system volume */ +s32 ffsGetVolInfo(struct super_block *sb, VOL_INFO_T *info) +{ + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + if (p_fs->used_clusters == (u32) ~0) + p_fs->used_clusters = p_fs->fs_func->count_used_clusters(sb); + + info->FatType = p_fs->vol_type; + info->ClusterSize = p_fs->cluster_size; + info->NumClusters = p_fs->num_clusters - 2; /* clu 0 & 1 */ + info->UsedClusters = p_fs->used_clusters; + info->FreeClusters = info->NumClusters - info->UsedClusters; + + if (p_fs->dev_ejected) + return FFS_MEDIAERR; + + return FFS_SUCCESS; +} /* end of ffsGetVolInfo */ + +/* ffsSyncVol : synchronize all file system volumes */ +s32 ffsSyncVol(struct super_block *sb, s32 do_sync) +{ + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + /* synchronize the file system */ + fs_sync(sb, do_sync); + fs_set_vol_flags(sb, VOL_CLEAN); + + if (p_fs->dev_ejected) + return FFS_MEDIAERR; + + return FFS_SUCCESS; +} /* end of ffsSyncVol */ + +/*----------------------------------------------------------------------*/ +/* File Operation Functions */ +/*----------------------------------------------------------------------*/ + +/* ffsLookupFile : lookup a file */ +s32 ffsLookupFile(struct inode *inode, char *path, FILE_ID_T *fid) +{ + s32 ret, dentry, num_entries; + CHAIN_T dir; + UNI_NAME_T uni_name; + DOS_NAME_T dos_name; + DENTRY_T *ep, *ep2; + ENTRY_SET_CACHE_T *es = NULL; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + DPRINTK("ffsLookupFile entered\n"); + + /* check the validity of directory name in the given pathname */ + ret = resolve_path(inode, path, &dir, &uni_name); + if (ret) + return ret; + + ret = get_num_entries_and_dos_name(sb, &dir, &uni_name, &num_entries, &dos_name); + if (ret) + return ret; + + /* search the file name for directories */ + dentry = p_fs->fs_func->find_dir_entry(sb, &dir, &uni_name, num_entries, &dos_name, TYPE_ALL); + if (dentry < -1) + return FFS_NOTFOUND; + + fid->dir.dir = dir.dir; + fid->dir.size = dir.size; + fid->dir.flags = dir.flags; + fid->entry = dentry; + + if (dentry == -1) { + fid->type = TYPE_DIR; + fid->rwoffset = 0; + fid->hint_last_off = -1; + + fid->attr = ATTR_SUBDIR; + fid->flags = 0x01; + fid->size = 0; + fid->start_clu = p_fs->root_dir; + } else { + if (p_fs->vol_type == EXFAT) { + es = get_entry_set_in_dir(sb, &dir, dentry, ES_2_ENTRIES, &ep); + if (!es) + return FFS_MEDIAERR; + ep2 = ep+1; + } else { + ep = get_entry_in_dir(sb, &dir, dentry, NULL); + if (!ep) + return FFS_MEDIAERR; + ep2 = ep; + } + + fid->type = p_fs->fs_func->get_entry_type(ep); + fid->rwoffset = 0; + fid->hint_last_off = -1; + fid->attr = p_fs->fs_func->get_entry_attr(ep); + + fid->size = p_fs->fs_func->get_entry_size(ep2); + if ((fid->type == TYPE_FILE) && (fid->size == 0)) { + fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01; + fid->start_clu = CLUSTER_32(~0); + } else { + fid->flags = p_fs->fs_func->get_entry_flag(ep2); + fid->start_clu = p_fs->fs_func->get_entry_clu0(ep2); + } + + if (p_fs->vol_type == EXFAT) + release_entry_set(es); + } + + if (p_fs->dev_ejected) + return FFS_MEDIAERR; + + DPRINTK("ffsLookupFile exited successfully\n"); + + return FFS_SUCCESS; +} /* end of ffsLookupFile */ + +/* ffsCreateFile : create a file */ +s32 ffsCreateFile(struct inode *inode, char *path, u8 mode, FILE_ID_T *fid) +{ + s32 ret/*, dentry*/; + CHAIN_T dir; + UNI_NAME_T uni_name; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + /* check the validity of directory name in the given pathname */ + ret = resolve_path(inode, path, &dir, &uni_name); + if (ret) + return ret; + + fs_set_vol_flags(sb, VOL_DIRTY); + + /* create a new file */ + ret = create_file(inode, &dir, &uni_name, mode, fid); + +#ifdef CONFIG_EXFAT_DELAYED_SYNC + fs_sync(sb, 0); + fs_set_vol_flags(sb, VOL_CLEAN); +#endif + + if (p_fs->dev_ejected) + return FFS_MEDIAERR; + + return ret; +} /* end of ffsCreateFile */ + +/* ffsReadFile : read data from a opened file */ +s32 ffsReadFile(struct inode *inode, FILE_ID_T *fid, void *buffer, u64 count, u64 *rcount) +{ + s32 offset, sec_offset, clu_offset; + u32 clu; + sector_t LogSector; + u64 oneblkread, read_bytes; + struct buffer_head *tmp_bh = NULL; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + + /* check if the given file ID is opened */ + if (fid->type != TYPE_FILE) + return FFS_PERMISSIONERR; + + if (fid->rwoffset > fid->size) + fid->rwoffset = fid->size; + + if (count > (fid->size - fid->rwoffset)) + count = fid->size - fid->rwoffset; + + if (count == 0) { + if (rcount != NULL) + *rcount = 0; + return FFS_EOF; + } + + read_bytes = 0; + + while (count > 0) { + clu_offset = (s32)(fid->rwoffset >> p_fs->cluster_size_bits); + clu = fid->start_clu; + + if (fid->flags == 0x03) { + clu += clu_offset; + } else { + /* hint information */ + if ((clu_offset > 0) && (fid->hint_last_off > 0) && + (clu_offset >= fid->hint_last_off)) { + clu_offset -= fid->hint_last_off; + clu = fid->hint_last_clu; + } + + while (clu_offset > 0) { + /* clu = FAT_read(sb, clu); */ + if (FAT_read(sb, clu, &clu) == -1) + return FFS_MEDIAERR; + + clu_offset--; + } + } + + /* hint information */ + fid->hint_last_off = (s32)(fid->rwoffset >> p_fs->cluster_size_bits); + fid->hint_last_clu = clu; + + offset = (s32)(fid->rwoffset & (p_fs->cluster_size-1)); /* byte offset in cluster */ + sec_offset = offset >> p_bd->sector_size_bits; /* sector offset in cluster */ + offset &= p_bd->sector_size_mask; /* byte offset in sector */ + + LogSector = START_SECTOR(clu) + sec_offset; + + oneblkread = (u64)(p_bd->sector_size - offset); + if (oneblkread > count) + oneblkread = count; + + if ((offset == 0) && (oneblkread == p_bd->sector_size)) { + if (sector_read(sb, LogSector, &tmp_bh, 1) != FFS_SUCCESS) + goto err_out; + memcpy(((char *) buffer)+read_bytes, ((char *) tmp_bh->b_data), (s32) oneblkread); + } else { + if (sector_read(sb, LogSector, &tmp_bh, 1) != FFS_SUCCESS) + goto err_out; + memcpy(((char *) buffer)+read_bytes, ((char *) tmp_bh->b_data)+offset, (s32) oneblkread); + } + count -= oneblkread; + read_bytes += oneblkread; + fid->rwoffset += oneblkread; + } + brelse(tmp_bh); + +err_out: + /* set the size of read bytes */ + if (rcount != NULL) + *rcount = read_bytes; + + if (p_fs->dev_ejected) + return FFS_MEDIAERR; + + return FFS_SUCCESS; +} /* end of ffsReadFile */ + +/* ffsWriteFile : write data into a opened file */ +s32 ffsWriteFile(struct inode *inode, FILE_ID_T *fid, void *buffer, u64 count, u64 *wcount) +{ + s32 modified = FALSE, offset, sec_offset, clu_offset; + s32 num_clusters, num_alloc, num_alloced = (s32) ~0; + u32 clu, last_clu; + sector_t LogSector, sector = 0; + u64 oneblkwrite, write_bytes; + CHAIN_T new_clu; + TIMESTAMP_T tm; + DENTRY_T *ep, *ep2; + ENTRY_SET_CACHE_T *es = NULL; + struct buffer_head *tmp_bh = NULL; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + + /* check if the given file ID is opened */ + if (fid->type != TYPE_FILE) + return FFS_PERMISSIONERR; + + if (fid->rwoffset > fid->size) + fid->rwoffset = fid->size; + + if (count == 0) { + if (wcount != NULL) + *wcount = 0; + return FFS_SUCCESS; + } + + fs_set_vol_flags(sb, VOL_DIRTY); + + if (fid->size == 0) + num_clusters = 0; + else + num_clusters = (s32)((fid->size-1) >> p_fs->cluster_size_bits) + 1; + + write_bytes = 0; + + while (count > 0) { + clu_offset = (s32)(fid->rwoffset >> p_fs->cluster_size_bits); + clu = last_clu = fid->start_clu; + + if (fid->flags == 0x03) { + if ((clu_offset > 0) && (clu != CLUSTER_32(~0))) { + last_clu += clu_offset - 1; + + if (clu_offset == num_clusters) + clu = CLUSTER_32(~0); + else + clu += clu_offset; + } + } else { + /* hint information */ + if ((clu_offset > 0) && (fid->hint_last_off > 0) && + (clu_offset >= fid->hint_last_off)) { + clu_offset -= fid->hint_last_off; + clu = fid->hint_last_clu; + } + + while ((clu_offset > 0) && (clu != CLUSTER_32(~0))) { + last_clu = clu; + /* clu = FAT_read(sb, clu); */ + if (FAT_read(sb, clu, &clu) == -1) + return FFS_MEDIAERR; + + clu_offset--; + } + } + + if (clu == CLUSTER_32(~0)) { + num_alloc = (s32)((count-1) >> p_fs->cluster_size_bits) + 1; + new_clu.dir = (last_clu == CLUSTER_32(~0)) ? CLUSTER_32(~0) : last_clu+1; + new_clu.size = 0; + new_clu.flags = fid->flags; + + /* (1) allocate a chain of clusters */ + num_alloced = p_fs->fs_func->alloc_cluster(sb, num_alloc, &new_clu); + if (num_alloced == 0) + break; + else if (num_alloced < 0) + return FFS_MEDIAERR; + + /* (2) append to the FAT chain */ + if (last_clu == CLUSTER_32(~0)) { + if (new_clu.flags == 0x01) + fid->flags = 0x01; + fid->start_clu = new_clu.dir; + modified = TRUE; + } else { + if (new_clu.flags != fid->flags) { + exfat_chain_cont_cluster(sb, fid->start_clu, num_clusters); + fid->flags = 0x01; + modified = TRUE; + } + if (new_clu.flags == 0x01) + FAT_write(sb, last_clu, new_clu.dir); + } + + num_clusters += num_alloced; + clu = new_clu.dir; + } + + /* hint information */ + fid->hint_last_off = (s32)(fid->rwoffset >> p_fs->cluster_size_bits); + fid->hint_last_clu = clu; + + offset = (s32)(fid->rwoffset & (p_fs->cluster_size-1)); /* byte offset in cluster */ + sec_offset = offset >> p_bd->sector_size_bits; /* sector offset in cluster */ + offset &= p_bd->sector_size_mask; /* byte offset in sector */ + + LogSector = START_SECTOR(clu) + sec_offset; + + oneblkwrite = (u64)(p_bd->sector_size - offset); + if (oneblkwrite > count) + oneblkwrite = count; + + if ((offset == 0) && (oneblkwrite == p_bd->sector_size)) { + if (sector_read(sb, LogSector, &tmp_bh, 0) != FFS_SUCCESS) + goto err_out; + memcpy(((char *) tmp_bh->b_data), ((char *) buffer)+write_bytes, (s32) oneblkwrite); + if (sector_write(sb, LogSector, tmp_bh, 0) != FFS_SUCCESS) { + brelse(tmp_bh); + goto err_out; + } + } else { + if ((offset > 0) || ((fid->rwoffset+oneblkwrite) < fid->size)) { + if (sector_read(sb, LogSector, &tmp_bh, 1) != FFS_SUCCESS) + goto err_out; + } else { + if (sector_read(sb, LogSector, &tmp_bh, 0) != FFS_SUCCESS) + goto err_out; + } + + memcpy(((char *) tmp_bh->b_data)+offset, ((char *) buffer)+write_bytes, (s32) oneblkwrite); + if (sector_write(sb, LogSector, tmp_bh, 0) != FFS_SUCCESS) { + brelse(tmp_bh); + goto err_out; + } + } + + count -= oneblkwrite; + write_bytes += oneblkwrite; + fid->rwoffset += oneblkwrite; + + fid->attr |= ATTR_ARCHIVE; + + if (fid->size < fid->rwoffset) { + fid->size = fid->rwoffset; + modified = TRUE; + } + } + + brelse(tmp_bh); + + /* (3) update the direcoty entry */ + if (p_fs->vol_type == EXFAT) { + es = get_entry_set_in_dir(sb, &(fid->dir), fid->entry, ES_ALL_ENTRIES, &ep); + if (es == NULL) + goto err_out; + ep2 = ep+1; + } else { + ep = get_entry_in_dir(sb, &(fid->dir), fid->entry, §or); + if (!ep) + goto err_out; + ep2 = ep; + } + + p_fs->fs_func->set_entry_time(ep, tm_current(&tm), TM_MODIFY); + p_fs->fs_func->set_entry_attr(ep, fid->attr); + + if (p_fs->vol_type != EXFAT) + buf_modify(sb, sector); + + if (modified) { + if (p_fs->fs_func->get_entry_flag(ep2) != fid->flags) + p_fs->fs_func->set_entry_flag(ep2, fid->flags); + + if (p_fs->fs_func->get_entry_size(ep2) != fid->size) + p_fs->fs_func->set_entry_size(ep2, fid->size); + + if (p_fs->fs_func->get_entry_clu0(ep2) != fid->start_clu) + p_fs->fs_func->set_entry_clu0(ep2, fid->start_clu); + + if (p_fs->vol_type != EXFAT) + buf_modify(sb, sector); + } + + if (p_fs->vol_type == EXFAT) { + update_dir_checksum_with_entry_set(sb, es); + release_entry_set(es); + } + +#ifdef CONFIG_EXFAT_DELAYED_SYNC + fs_sync(sb, 0); + fs_set_vol_flags(sb, VOL_CLEAN); +#endif + +err_out: + /* set the size of written bytes */ + if (wcount != NULL) + *wcount = write_bytes; + + if (num_alloced == 0) + return FFS_FULL; + + if (p_fs->dev_ejected) + return FFS_MEDIAERR; + + return FFS_SUCCESS; +} /* end of ffsWriteFile */ + +/* ffsTruncateFile : resize the file length */ +s32 ffsTruncateFile(struct inode *inode, u64 old_size, u64 new_size) +{ + s32 num_clusters; + u32 last_clu = CLUSTER_32(0); + sector_t sector = 0; + CHAIN_T clu; + TIMESTAMP_T tm; + DENTRY_T *ep, *ep2; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + FILE_ID_T *fid = &(EXFAT_I(inode)->fid); + ENTRY_SET_CACHE_T *es = NULL; + + /* check if the given file ID is opened */ + if (fid->type != TYPE_FILE) + return FFS_PERMISSIONERR; + + if (fid->size != old_size) { + printk(KERN_ERR "[EXFAT] truncate : can't skip it because of " + "size-mismatch(old:%lld->fid:%lld).\n" + ,old_size, fid->size); + } + + if (old_size <= new_size) + return FFS_SUCCESS; + + fs_set_vol_flags(sb, VOL_DIRTY); + + clu.dir = fid->start_clu; + clu.size = (s32)((old_size-1) >> p_fs->cluster_size_bits) + 1; + clu.flags = fid->flags; + + if (new_size > 0) { + num_clusters = (s32)((new_size-1) >> p_fs->cluster_size_bits) + 1; + + if (clu.flags == 0x03) { + clu.dir += num_clusters; + } else { + while (num_clusters > 0) { + last_clu = clu.dir; + if (FAT_read(sb, clu.dir, &(clu.dir)) == -1) + return FFS_MEDIAERR; + num_clusters--; + } + } + + clu.size -= num_clusters; + } + + fid->size = new_size; + fid->attr |= ATTR_ARCHIVE; + if (new_size == 0) { + fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01; + fid->start_clu = CLUSTER_32(~0); + } + + /* (1) update the directory entry */ + if (p_fs->vol_type == EXFAT) { + es = get_entry_set_in_dir(sb, &(fid->dir), fid->entry, ES_ALL_ENTRIES, &ep); + if (es == NULL) + return FFS_MEDIAERR; + ep2 = ep+1; + } else { + ep = get_entry_in_dir(sb, &(fid->dir), fid->entry, §or); + if (!ep) + return FFS_MEDIAERR; + ep2 = ep; + } + + p_fs->fs_func->set_entry_time(ep, tm_current(&tm), TM_MODIFY); + p_fs->fs_func->set_entry_attr(ep, fid->attr); + + p_fs->fs_func->set_entry_size(ep2, new_size); + if (new_size == 0) { + p_fs->fs_func->set_entry_flag(ep2, 0x01); + p_fs->fs_func->set_entry_clu0(ep2, CLUSTER_32(0)); + } + + if (p_fs->vol_type != EXFAT) + buf_modify(sb, sector); + else { + update_dir_checksum_with_entry_set(sb, es); + release_entry_set(es); + } + + /* (2) cut off from the FAT chain */ + if (last_clu != CLUSTER_32(0)) { + if (fid->flags == 0x01) + FAT_write(sb, last_clu, CLUSTER_32(~0)); + } + + /* (3) free the clusters */ + p_fs->fs_func->free_cluster(sb, &clu, 0); + + /* hint information */ + fid->hint_last_off = -1; + if (fid->rwoffset > fid->size) + fid->rwoffset = fid->size; + +#ifdef CONFIG_EXFAT_DELAYED_SYNC + fs_sync(sb, 0); + fs_set_vol_flags(sb, VOL_CLEAN); +#endif + + if (p_fs->dev_ejected) + return FFS_MEDIAERR; + + return FFS_SUCCESS; +} /* end of ffsTruncateFile */ + +static void update_parent_info(FILE_ID_T *fid, struct inode *parent_inode) +{ + FS_INFO_T *p_fs = &(EXFAT_SB(parent_inode->i_sb)->fs_info); + FILE_ID_T *parent_fid = &(EXFAT_I(parent_inode)->fid); + + if (unlikely((parent_fid->flags != fid->dir.flags) + || (parent_fid->size != (fid->dir.size<cluster_size_bits)) + || (parent_fid->start_clu != fid->dir.dir))) { + + fid->dir.dir = parent_fid->start_clu; + fid->dir.flags = parent_fid->flags; + fid->dir.size = ((parent_fid->size + (p_fs->cluster_size-1)) + >> p_fs->cluster_size_bits); + } +} + +/* ffsMoveFile : move(rename) a old file into a new file */ +s32 ffsMoveFile(struct inode *old_parent_inode, FILE_ID_T *fid, struct inode *new_parent_inode, struct dentry *new_dentry) +{ + s32 ret; + s32 dentry; + CHAIN_T olddir, newdir; + CHAIN_T *p_dir = NULL; + UNI_NAME_T uni_name; + DENTRY_T *ep; + struct super_block *sb = old_parent_inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + u8 *new_path = (u8 *) new_dentry->d_name.name; + struct inode *new_inode = new_dentry->d_inode; + int num_entries; + FILE_ID_T *new_fid = NULL; + s32 new_entry = 0; + + /* check the validity of pointer parameters */ + if ((new_path == NULL) || (*new_path == '\0')) + return FFS_ERROR; + + update_parent_info(fid, old_parent_inode); + + olddir.dir = fid->dir.dir; + olddir.size = fid->dir.size; + olddir.flags = fid->dir.flags; + + dentry = fid->entry; + + /* check if the old file is "." or ".." */ + if (p_fs->vol_type != EXFAT) { + if ((olddir.dir != p_fs->root_dir) && (dentry < 2)) + return FFS_PERMISSIONERR; + } + + ep = get_entry_in_dir(sb, &olddir, dentry, NULL); + if (!ep) + return FFS_MEDIAERR; + + if (p_fs->fs_func->get_entry_attr(ep) & ATTR_READONLY) + return FFS_PERMISSIONERR; + + /* check whether new dir is existing directory and empty */ + if (new_inode) { + u32 entry_type; + + ret = FFS_MEDIAERR; + new_fid = &EXFAT_I(new_inode)->fid; + + update_parent_info(new_fid, new_parent_inode); + + p_dir = &(new_fid->dir); + new_entry = new_fid->entry; + ep = get_entry_in_dir(sb, p_dir, new_entry, NULL); + if (!ep) + goto out; + + entry_type = p_fs->fs_func->get_entry_type(ep); + + if (entry_type == TYPE_DIR) { + CHAIN_T new_clu; + new_clu.dir = new_fid->start_clu; + new_clu.size = (s32)((new_fid->size-1) >> p_fs->cluster_size_bits) + 1; + new_clu.flags = new_fid->flags; + + if (!is_dir_empty(sb, &new_clu)) + return FFS_FILEEXIST; + } + } + + /* check the validity of directory name in the given new pathname */ + ret = resolve_path(new_parent_inode, new_path, &newdir, &uni_name); + if (ret) + return ret; + + fs_set_vol_flags(sb, VOL_DIRTY); + + if (olddir.dir == newdir.dir) + ret = rename_file(new_parent_inode, &olddir, dentry, &uni_name, fid); + else + ret = move_file(new_parent_inode, &olddir, dentry, &newdir, &uni_name, fid); + + if ((ret == FFS_SUCCESS) && new_inode) { + /* delete entries of new_dir */ + ep = get_entry_in_dir(sb, p_dir, new_entry, NULL); + if (!ep) + goto out; + + num_entries = p_fs->fs_func->count_ext_entries(sb, p_dir, new_entry, ep); + if (num_entries < 0) + goto out; + p_fs->fs_func->delete_dir_entry(sb, p_dir, new_entry, 0, num_entries+1); + } +out: +#ifdef CONFIG_EXFAT_DELAYED_SYNC + fs_sync(sb, 0); + fs_set_vol_flags(sb, VOL_CLEAN); +#endif + + if (p_fs->dev_ejected) + return FFS_MEDIAERR; + + return ret; +} /* end of ffsMoveFile */ + +/* ffsRemoveFile : remove a file */ +s32 ffsRemoveFile(struct inode *inode, FILE_ID_T *fid) +{ + s32 dentry; + CHAIN_T dir, clu_to_free; + DENTRY_T *ep; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + dir.dir = fid->dir.dir; + dir.size = fid->dir.size; + dir.flags = fid->dir.flags; + + dentry = fid->entry; + + ep = get_entry_in_dir(sb, &dir, dentry, NULL); + if (!ep) + return FFS_MEDIAERR; + + if (p_fs->fs_func->get_entry_attr(ep) & ATTR_READONLY) + return FFS_PERMISSIONERR; + + fs_set_vol_flags(sb, VOL_DIRTY); + + /* (1) update the directory entry */ + remove_file(inode, &dir, dentry); + + clu_to_free.dir = fid->start_clu; + clu_to_free.size = (s32)((fid->size-1) >> p_fs->cluster_size_bits) + 1; + clu_to_free.flags = fid->flags; + + /* (2) free the clusters */ + p_fs->fs_func->free_cluster(sb, &clu_to_free, 0); + + fid->size = 0; + fid->start_clu = CLUSTER_32(~0); + fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01; + +#ifdef CONFIG_EXFAT_DELAYED_SYNC + fs_sync(sb, 0); + fs_set_vol_flags(sb, VOL_CLEAN); +#endif + + if (p_fs->dev_ejected) + return FFS_MEDIAERR; + + return FFS_SUCCESS; +} /* end of ffsRemoveFile */ + +/* ffsSetAttr : set the attribute of a given file */ +s32 ffsSetAttr(struct inode *inode, u32 attr) +{ + u32 type; + sector_t sector = 0; + DENTRY_T *ep; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + FILE_ID_T *fid = &(EXFAT_I(inode)->fid); + u8 is_dir = (fid->type == TYPE_DIR) ? 1 : 0; + ENTRY_SET_CACHE_T *es = NULL; + + if (fid->attr == attr) { + if (p_fs->dev_ejected) + return FFS_MEDIAERR; + return FFS_SUCCESS; + } + + if (is_dir) { + if ((fid->dir.dir == p_fs->root_dir) && + (fid->entry == -1)) { + if (p_fs->dev_ejected) + return FFS_MEDIAERR; + return FFS_SUCCESS; + } + } + + /* get the directory entry of given file */ + if (p_fs->vol_type == EXFAT) { + es = get_entry_set_in_dir(sb, &(fid->dir), fid->entry, ES_ALL_ENTRIES, &ep); + if (es == NULL) + return FFS_MEDIAERR; + } else { + ep = get_entry_in_dir(sb, &(fid->dir), fid->entry, §or); + if (!ep) + return FFS_MEDIAERR; + } + + type = p_fs->fs_func->get_entry_type(ep); + + if (((type == TYPE_FILE) && (attr & ATTR_SUBDIR)) || + ((type == TYPE_DIR) && (!(attr & ATTR_SUBDIR)))) { + s32 err; + if (p_fs->dev_ejected) + err = FFS_MEDIAERR; + else + err = FFS_ERROR; + + if (p_fs->vol_type == EXFAT) + release_entry_set(es); + return err; + } + + fs_set_vol_flags(sb, VOL_DIRTY); + + /* set the file attribute */ + fid->attr = attr; + p_fs->fs_func->set_entry_attr(ep, attr); + + if (p_fs->vol_type != EXFAT) + buf_modify(sb, sector); + else { + update_dir_checksum_with_entry_set(sb, es); + release_entry_set(es); + } + +#ifdef CONFIG_EXFAT_DELAYED_SYNC + fs_sync(sb, 0); + fs_set_vol_flags(sb, VOL_CLEAN); +#endif + + if (p_fs->dev_ejected) + return FFS_MEDIAERR; + + return FFS_SUCCESS; +} /* end of ffsSetAttr */ + +/* ffsGetStat : get the information of a given file */ +s32 ffsGetStat(struct inode *inode, DIR_ENTRY_T *info) +{ + sector_t sector = 0; + s32 count; + CHAIN_T dir; + UNI_NAME_T uni_name; + TIMESTAMP_T tm; + DENTRY_T *ep, *ep2; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + FILE_ID_T *fid = &(EXFAT_I(inode)->fid); + ENTRY_SET_CACHE_T *es = NULL; + u8 is_dir = (fid->type == TYPE_DIR) ? 1 : 0; + + DPRINTK("ffsGetStat entered\n"); + + if (is_dir) { + if ((fid->dir.dir == p_fs->root_dir) && + (fid->entry == -1)) { + info->Attr = ATTR_SUBDIR; + memset((char *) &info->CreateTimestamp, 0, sizeof(DATE_TIME_T)); + memset((char *) &info->ModifyTimestamp, 0, sizeof(DATE_TIME_T)); + memset((char *) &info->AccessTimestamp, 0, sizeof(DATE_TIME_T)); + strcpy(info->ShortName, "."); + strcpy(info->Name, "."); + + dir.dir = p_fs->root_dir; + dir.flags = 0x01; + + if (p_fs->root_dir == CLUSTER_32(0)) /* FAT16 root_dir */ + info->Size = p_fs->dentries_in_root << DENTRY_SIZE_BITS; + else + info->Size = count_num_clusters(sb, &dir) << p_fs->cluster_size_bits; + + count = count_dos_name_entries(sb, &dir, TYPE_DIR); + if (count < 0) + return FFS_MEDIAERR; + info->NumSubdirs = count; + + if (p_fs->dev_ejected) + return FFS_MEDIAERR; + return FFS_SUCCESS; + } + } + + /* get the directory entry of given file or directory */ + if (p_fs->vol_type == EXFAT) { + es = get_entry_set_in_dir(sb, &(fid->dir), fid->entry, ES_2_ENTRIES, &ep); + if (es == NULL) + return FFS_MEDIAERR; + ep2 = ep+1; + } else { + ep = get_entry_in_dir(sb, &(fid->dir), fid->entry, §or); + if (!ep) + return FFS_MEDIAERR; + ep2 = ep; + buf_lock(sb, sector); + } + + /* set FILE_INFO structure using the acquired DENTRY_T */ + info->Attr = p_fs->fs_func->get_entry_attr(ep); + + p_fs->fs_func->get_entry_time(ep, &tm, TM_CREATE); + info->CreateTimestamp.Year = tm.year; + info->CreateTimestamp.Month = tm.mon; + info->CreateTimestamp.Day = tm.day; + info->CreateTimestamp.Hour = tm.hour; + info->CreateTimestamp.Minute = tm.min; + info->CreateTimestamp.Second = tm.sec; + info->CreateTimestamp.MilliSecond = 0; + + p_fs->fs_func->get_entry_time(ep, &tm, TM_MODIFY); + info->ModifyTimestamp.Year = tm.year; + info->ModifyTimestamp.Month = tm.mon; + info->ModifyTimestamp.Day = tm.day; + info->ModifyTimestamp.Hour = tm.hour; + info->ModifyTimestamp.Minute = tm.min; + info->ModifyTimestamp.Second = tm.sec; + info->ModifyTimestamp.MilliSecond = 0; + + memset((char *) &info->AccessTimestamp, 0, sizeof(DATE_TIME_T)); + + *(uni_name.name) = 0x0; + /* XXX this is very bad for exfat cuz name is already included in es. + API should be revised */ + p_fs->fs_func->get_uni_name_from_ext_entry(sb, &(fid->dir), fid->entry, uni_name.name); + if (*(uni_name.name) == 0x0 && p_fs->vol_type != EXFAT) + get_uni_name_from_dos_entry(sb, (DOS_DENTRY_T *) ep, &uni_name, 0x1); + nls_uniname_to_cstring(sb, info->Name, &uni_name); + + if (p_fs->vol_type == EXFAT) { + info->NumSubdirs = 2; + } else { + buf_unlock(sb, sector); + get_uni_name_from_dos_entry(sb, (DOS_DENTRY_T *) ep, &uni_name, 0x0); + nls_uniname_to_cstring(sb, info->ShortName, &uni_name); + info->NumSubdirs = 0; + } + + info->Size = p_fs->fs_func->get_entry_size(ep2); + + if (p_fs->vol_type == EXFAT) + release_entry_set(es); + + if (is_dir) { + dir.dir = fid->start_clu; + dir.flags = 0x01; + + if (info->Size == 0) + info->Size = (u64) count_num_clusters(sb, &dir) << p_fs->cluster_size_bits; + + count = count_dos_name_entries(sb, &dir, TYPE_DIR); + if (count < 0) + return FFS_MEDIAERR; + info->NumSubdirs += count; + } + + if (p_fs->dev_ejected) + return FFS_MEDIAERR; + + DPRINTK("ffsGetStat exited successfully\n"); + return FFS_SUCCESS; +} /* end of ffsGetStat */ + +/* ffsSetStat : set the information of a given file */ +s32 ffsSetStat(struct inode *inode, DIR_ENTRY_T *info) +{ + sector_t sector = 0; + TIMESTAMP_T tm; + DENTRY_T *ep, *ep2; + ENTRY_SET_CACHE_T *es = NULL; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + FILE_ID_T *fid = &(EXFAT_I(inode)->fid); + u8 is_dir = (fid->type == TYPE_DIR) ? 1 : 0; + + if (is_dir) { + if ((fid->dir.dir == p_fs->root_dir) && + (fid->entry == -1)) { + if (p_fs->dev_ejected) + return FFS_MEDIAERR; + return FFS_SUCCESS; + } + } + + fs_set_vol_flags(sb, VOL_DIRTY); + + /* get the directory entry of given file or directory */ + if (p_fs->vol_type == EXFAT) { + es = get_entry_set_in_dir(sb, &(fid->dir), fid->entry, ES_ALL_ENTRIES, &ep); + if (es == NULL) + return FFS_MEDIAERR; + ep2 = ep+1; + } else { + /* for other than exfat */ + ep = get_entry_in_dir(sb, &(fid->dir), fid->entry, §or); + if (!ep) + return FFS_MEDIAERR; + ep2 = ep; + } + + + p_fs->fs_func->set_entry_attr(ep, info->Attr); + + /* set FILE_INFO structure using the acquired DENTRY_T */ + tm.sec = info->CreateTimestamp.Second; + tm.min = info->CreateTimestamp.Minute; + tm.hour = info->CreateTimestamp.Hour; + tm.day = info->CreateTimestamp.Day; + tm.mon = info->CreateTimestamp.Month; + tm.year = info->CreateTimestamp.Year; + p_fs->fs_func->set_entry_time(ep, &tm, TM_CREATE); + + tm.sec = info->ModifyTimestamp.Second; + tm.min = info->ModifyTimestamp.Minute; + tm.hour = info->ModifyTimestamp.Hour; + tm.day = info->ModifyTimestamp.Day; + tm.mon = info->ModifyTimestamp.Month; + tm.year = info->ModifyTimestamp.Year; + p_fs->fs_func->set_entry_time(ep, &tm, TM_MODIFY); + + + p_fs->fs_func->set_entry_size(ep2, info->Size); + + if (p_fs->vol_type != EXFAT) { + buf_modify(sb, sector); + } else { + update_dir_checksum_with_entry_set(sb, es); + release_entry_set(es); + } + + if (p_fs->dev_ejected) + return FFS_MEDIAERR; + + return FFS_SUCCESS; +} /* end of ffsSetStat */ + +s32 ffsMapCluster(struct inode *inode, s32 clu_offset, u32 *clu) +{ + s32 num_clusters, num_alloced, modified = FALSE; + u32 last_clu; + sector_t sector = 0; + CHAIN_T new_clu; + DENTRY_T *ep; + ENTRY_SET_CACHE_T *es = NULL; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + FILE_ID_T *fid = &(EXFAT_I(inode)->fid); + + fid->rwoffset = (s64)(clu_offset) << p_fs->cluster_size_bits; + + if (EXFAT_I(inode)->mmu_private == 0) + num_clusters = 0; + else + num_clusters = (s32)((EXFAT_I(inode)->mmu_private-1) >> p_fs->cluster_size_bits) + 1; + + *clu = last_clu = fid->start_clu; + + if (fid->flags == 0x03) { + if ((clu_offset > 0) && (*clu != CLUSTER_32(~0))) { + last_clu += clu_offset - 1; + + if (clu_offset == num_clusters) + *clu = CLUSTER_32(~0); + else + *clu += clu_offset; + } + } else { + /* hint information */ + if ((clu_offset > 0) && (fid->hint_last_off > 0) && + (clu_offset >= fid->hint_last_off)) { + clu_offset -= fid->hint_last_off; + *clu = fid->hint_last_clu; + } + + while ((clu_offset > 0) && (*clu != CLUSTER_32(~0))) { + last_clu = *clu; + if (FAT_read(sb, *clu, clu) == -1) + return FFS_MEDIAERR; + clu_offset--; + } + } + + if (*clu == CLUSTER_32(~0)) { + fs_set_vol_flags(sb, VOL_DIRTY); + + new_clu.dir = (last_clu == CLUSTER_32(~0)) ? CLUSTER_32(~0) : last_clu+1; + new_clu.size = 0; + new_clu.flags = fid->flags; + + /* (1) allocate a cluster */ + num_alloced = p_fs->fs_func->alloc_cluster(sb, 1, &new_clu); + if (num_alloced < 0) + return FFS_MEDIAERR; + else if (num_alloced == 0) + return FFS_FULL; + + /* (2) append to the FAT chain */ + if (last_clu == CLUSTER_32(~0)) { + if (new_clu.flags == 0x01) + fid->flags = 0x01; + fid->start_clu = new_clu.dir; + modified = TRUE; + } else { + if (new_clu.flags != fid->flags) { + exfat_chain_cont_cluster(sb, fid->start_clu, num_clusters); + fid->flags = 0x01; + modified = TRUE; + } + if (new_clu.flags == 0x01) + FAT_write(sb, last_clu, new_clu.dir); + } + + num_clusters += num_alloced; + *clu = new_clu.dir; + + if (p_fs->vol_type == EXFAT) { + es = get_entry_set_in_dir(sb, &(fid->dir), fid->entry, ES_ALL_ENTRIES, &ep); + if (es == NULL) + return FFS_MEDIAERR; + /* get stream entry */ + ep++; + } + + /* (3) update directory entry */ + if (modified) { + if (p_fs->vol_type != EXFAT) { + ep = get_entry_in_dir(sb, &(fid->dir), fid->entry, §or); + if (!ep) + return FFS_MEDIAERR; + } + + if (p_fs->fs_func->get_entry_flag(ep) != fid->flags) + p_fs->fs_func->set_entry_flag(ep, fid->flags); + + if (p_fs->fs_func->get_entry_clu0(ep) != fid->start_clu) + p_fs->fs_func->set_entry_clu0(ep, fid->start_clu); + + if (p_fs->vol_type != EXFAT) + buf_modify(sb, sector); + } + + if (p_fs->vol_type == EXFAT) { + update_dir_checksum_with_entry_set(sb, es); + release_entry_set(es); + } + + /* add number of new blocks to inode */ + inode->i_blocks += num_alloced << (p_fs->cluster_size_bits - 9); + } + + /* hint information */ + fid->hint_last_off = (s32)(fid->rwoffset >> p_fs->cluster_size_bits); + fid->hint_last_clu = *clu; + + if (p_fs->dev_ejected) + return FFS_MEDIAERR; + + return FFS_SUCCESS; +} /* end of ffsMapCluster */ + +/*----------------------------------------------------------------------*/ +/* Directory Operation Functions */ +/*----------------------------------------------------------------------*/ + +/* ffsCreateDir : create(make) a directory */ +s32 ffsCreateDir(struct inode *inode, char *path, FILE_ID_T *fid) +{ + s32 ret/*, dentry*/; + CHAIN_T dir; + UNI_NAME_T uni_name; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + DPRINTK("ffsCreateDir entered\n"); + + /* check the validity of directory name in the given old pathname */ + ret = resolve_path(inode, path, &dir, &uni_name); + if (ret) + return ret; + + fs_set_vol_flags(sb, VOL_DIRTY); + + ret = create_dir(inode, &dir, &uni_name, fid); + +#ifdef CONFIG_EXFAT_DELAYED_SYNC + fs_sync(sb, 0); + fs_set_vol_flags(sb, VOL_CLEAN); +#endif + + if (p_fs->dev_ejected) + return FFS_MEDIAERR; + + return ret; +} /* end of ffsCreateDir */ + +/* ffsReadDir : read a directory entry from the opened directory */ +s32 ffsReadDir(struct inode *inode, DIR_ENTRY_T *dir_entry) +{ + int i, dentry, clu_offset; + s32 dentries_per_clu, dentries_per_clu_bits = 0; + u32 type; + sector_t sector; + CHAIN_T dir, clu; + UNI_NAME_T uni_name; + TIMESTAMP_T tm; + DENTRY_T *ep; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + FILE_ID_T *fid = &(EXFAT_I(inode)->fid); + + /* check if the given file ID is opened */ + if (fid->type != TYPE_DIR) + return FFS_PERMISSIONERR; + + if (fid->entry == -1) { + dir.dir = p_fs->root_dir; + dir.flags = 0x01; + } else { + dir.dir = fid->start_clu; + dir.size = (s32)(fid->size >> p_fs->cluster_size_bits); + dir.flags = fid->flags; + } + + dentry = (s32) fid->rwoffset; + + if (dir.dir == CLUSTER_32(0)) { /* FAT16 root_dir */ + dentries_per_clu = p_fs->dentries_in_root; + + if (dentry == dentries_per_clu) { + clu.dir = CLUSTER_32(~0); + } else { + clu.dir = dir.dir; + clu.size = dir.size; + clu.flags = dir.flags; + } + } else { + dentries_per_clu = p_fs->dentries_per_clu; + dentries_per_clu_bits = ilog2(dentries_per_clu); + + clu_offset = dentry >> dentries_per_clu_bits; + clu.dir = dir.dir; + clu.size = dir.size; + clu.flags = dir.flags; + + if (clu.flags == 0x03) { + clu.dir += clu_offset; + clu.size -= clu_offset; + } else { + /* hint_information */ + if ((clu_offset > 0) && (fid->hint_last_off > 0) && + (clu_offset >= fid->hint_last_off)) { + clu_offset -= fid->hint_last_off; + clu.dir = fid->hint_last_clu; + } + + while (clu_offset > 0) { + /* clu.dir = FAT_read(sb, clu.dir); */ + if (FAT_read(sb, clu.dir, &(clu.dir)) == -1) + return FFS_MEDIAERR; + + clu_offset--; + } + } + } + + while (clu.dir != CLUSTER_32(~0)) { + if (p_fs->dev_ejected) + break; + + if (dir.dir == CLUSTER_32(0)) /* FAT16 root_dir */ + i = dentry % dentries_per_clu; + else + i = dentry & (dentries_per_clu-1); + + for ( ; i < dentries_per_clu; i++, dentry++) { + ep = get_entry_in_dir(sb, &clu, i, §or); + if (!ep) + return FFS_MEDIAERR; + + type = p_fs->fs_func->get_entry_type(ep); + + if (type == TYPE_UNUSED) + break; + + if ((type != TYPE_FILE) && (type != TYPE_DIR)) + continue; + + buf_lock(sb, sector); + dir_entry->Attr = p_fs->fs_func->get_entry_attr(ep); + + p_fs->fs_func->get_entry_time(ep, &tm, TM_CREATE); + dir_entry->CreateTimestamp.Year = tm.year; + dir_entry->CreateTimestamp.Month = tm.mon; + dir_entry->CreateTimestamp.Day = tm.day; + dir_entry->CreateTimestamp.Hour = tm.hour; + dir_entry->CreateTimestamp.Minute = tm.min; + dir_entry->CreateTimestamp.Second = tm.sec; + dir_entry->CreateTimestamp.MilliSecond = 0; + + p_fs->fs_func->get_entry_time(ep, &tm, TM_MODIFY); + dir_entry->ModifyTimestamp.Year = tm.year; + dir_entry->ModifyTimestamp.Month = tm.mon; + dir_entry->ModifyTimestamp.Day = tm.day; + dir_entry->ModifyTimestamp.Hour = tm.hour; + dir_entry->ModifyTimestamp.Minute = tm.min; + dir_entry->ModifyTimestamp.Second = tm.sec; + dir_entry->ModifyTimestamp.MilliSecond = 0; + + memset((char *) &dir_entry->AccessTimestamp, 0, sizeof(DATE_TIME_T)); + + *(uni_name.name) = 0x0; + p_fs->fs_func->get_uni_name_from_ext_entry(sb, &dir, dentry, uni_name.name); + if (*(uni_name.name) == 0x0 && p_fs->vol_type != EXFAT) + get_uni_name_from_dos_entry(sb, (DOS_DENTRY_T *) ep, &uni_name, 0x1); + nls_uniname_to_cstring(sb, dir_entry->Name, &uni_name); + buf_unlock(sb, sector); + + if (p_fs->vol_type == EXFAT) { + ep = get_entry_in_dir(sb, &clu, i+1, NULL); + if (!ep) + return FFS_MEDIAERR; + } else { + get_uni_name_from_dos_entry(sb, (DOS_DENTRY_T *) ep, &uni_name, 0x0); + nls_uniname_to_cstring(sb, dir_entry->ShortName, &uni_name); + } + + dir_entry->Size = p_fs->fs_func->get_entry_size(ep); + + /* hint information */ + if (dir.dir == CLUSTER_32(0)) { /* FAT16 root_dir */ + } else { + fid->hint_last_off = dentry >> dentries_per_clu_bits; + fid->hint_last_clu = clu.dir; + } + + fid->rwoffset = (s64) ++dentry; + + if (p_fs->dev_ejected) + return FFS_MEDIAERR; + + return FFS_SUCCESS; + } + + if (dir.dir == CLUSTER_32(0)) + break; /* FAT16 root_dir */ + + if (clu.flags == 0x03) { + if ((--clu.size) > 0) + clu.dir++; + else + clu.dir = CLUSTER_32(~0); + } else { + /* clu.dir = FAT_read(sb, clu.dir); */ + if (FAT_read(sb, clu.dir, &(clu.dir)) == -1) + return FFS_MEDIAERR; + } + } + + *(dir_entry->Name) = '\0'; + + fid->rwoffset = (s64) ++dentry; + + if (p_fs->dev_ejected) + return FFS_MEDIAERR; + + return FFS_SUCCESS; +} /* end of ffsReadDir */ + +/* ffsRemoveDir : remove a directory */ +s32 ffsRemoveDir(struct inode *inode, FILE_ID_T *fid) +{ + s32 dentry; + CHAIN_T dir, clu_to_free; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + dir.dir = fid->dir.dir; + dir.size = fid->dir.size; + dir.flags = fid->dir.flags; + + dentry = fid->entry; + + /* check if the file is "." or ".." */ + if (p_fs->vol_type != EXFAT) { + if ((dir.dir != p_fs->root_dir) && (dentry < 2)) + return FFS_PERMISSIONERR; + } + + clu_to_free.dir = fid->start_clu; + clu_to_free.size = (s32)((fid->size-1) >> p_fs->cluster_size_bits) + 1; + clu_to_free.flags = fid->flags; + + if (!is_dir_empty(sb, &clu_to_free)) + return FFS_FILEEXIST; + + fs_set_vol_flags(sb, VOL_DIRTY); + + /* (1) update the directory entry */ + remove_file(inode, &dir, dentry); + + /* (2) free the clusters */ + p_fs->fs_func->free_cluster(sb, &clu_to_free, 1); + + fid->size = 0; + fid->start_clu = CLUSTER_32(~0); + fid->flags = (p_fs->vol_type == EXFAT)? 0x03: 0x01; + +#ifdef CONFIG_EXFAT_DELAYED_SYNC + fs_sync(sb, 0); + fs_set_vol_flags(sb, VOL_CLEAN); +#endif + + if (p_fs->dev_ejected) + return FFS_MEDIAERR; + + return FFS_SUCCESS; +} /* end of ffsRemoveDir */ + +/*======================================================================*/ +/* Local Function Definitions */ +/*======================================================================*/ + +/* + * File System Management Functions + */ + +s32 fs_init(void) +{ + /* critical check for system requirement on size of DENTRY_T structure */ + if (sizeof(DENTRY_T) != DENTRY_SIZE) + return FFS_ALIGNMENTERR; + + if (sizeof(DOS_DENTRY_T) != DENTRY_SIZE) + return FFS_ALIGNMENTERR; + + if (sizeof(EXT_DENTRY_T) != DENTRY_SIZE) + return FFS_ALIGNMENTERR; + + if (sizeof(FILE_DENTRY_T) != DENTRY_SIZE) + return FFS_ALIGNMENTERR; + + if (sizeof(STRM_DENTRY_T) != DENTRY_SIZE) + return FFS_ALIGNMENTERR; + + if (sizeof(NAME_DENTRY_T) != DENTRY_SIZE) + return FFS_ALIGNMENTERR; + + if (sizeof(BMAP_DENTRY_T) != DENTRY_SIZE) + return FFS_ALIGNMENTERR; + + if (sizeof(CASE_DENTRY_T) != DENTRY_SIZE) + return FFS_ALIGNMENTERR; + + if (sizeof(VOLM_DENTRY_T) != DENTRY_SIZE) + return FFS_ALIGNMENTERR; + + return FFS_SUCCESS; +} /* end of fs_init */ + +s32 fs_shutdown(void) +{ + return FFS_SUCCESS; +} /* end of fs_shutdown */ + +void fs_set_vol_flags(struct super_block *sb, u32 new_flag) +{ + PBR_SECTOR_T *p_pbr; + BPBEX_T *p_bpb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + if (p_fs->vol_flag == new_flag) + return; + + p_fs->vol_flag = new_flag; + + if (p_fs->vol_type == EXFAT) { + if (p_fs->pbr_bh == NULL) { + if (sector_read(sb, p_fs->PBR_sector, &(p_fs->pbr_bh), 1) != FFS_SUCCESS) + return; + } + + p_pbr = (PBR_SECTOR_T *) p_fs->pbr_bh->b_data; + p_bpb = (BPBEX_T *) p_pbr->bpb; + SET16(p_bpb->vol_flags, (u16) new_flag); + + /* XXX duyoung + what can we do here? (cuz fs_set_vol_flags() is void) */ + if ((new_flag == VOL_DIRTY) && (!buffer_dirty(p_fs->pbr_bh))) + sector_write(sb, p_fs->PBR_sector, p_fs->pbr_bh, 1); + else + sector_write(sb, p_fs->PBR_sector, p_fs->pbr_bh, 0); + } +} /* end of fs_set_vol_flags */ + +void fs_sync(struct super_block *sb, s32 do_sync) +{ + if (do_sync) + bdev_sync(sb); +} /* end of fs_sync */ + +void fs_error(struct super_block *sb) +{ + struct exfat_mount_options *opts = &EXFAT_SB(sb)->options; + + if (opts->errors == EXFAT_ERRORS_PANIC) + panic("[EXFAT] Filesystem panic from previous error\n"); + else if ((opts->errors == EXFAT_ERRORS_RO) && !(sb->s_flags & MS_RDONLY)) { + sb->s_flags |= MS_RDONLY; + printk(KERN_ERR "[EXFAT] Filesystem has been set read-only\n"); + } +} + +/* + * Cluster Management Functions + */ + +s32 clear_cluster(struct super_block *sb, u32 clu) +{ + sector_t s, n; + s32 ret = FFS_SUCCESS; + struct buffer_head *tmp_bh = NULL; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + + if (clu == CLUSTER_32(0)) { /* FAT16 root_dir */ + s = p_fs->root_start_sector; + n = p_fs->data_start_sector; + } else { + s = START_SECTOR(clu); + n = s + p_fs->sectors_per_clu; + } + + for (; s < n; s++) { + ret = sector_read(sb, s, &tmp_bh, 0); + if (ret != FFS_SUCCESS) + return ret; + + memset((char *) tmp_bh->b_data, 0x0, p_bd->sector_size); + ret = sector_write(sb, s, tmp_bh, 0); + if (ret != FFS_SUCCESS) + break; + } + + brelse(tmp_bh); + return ret; +} /* end of clear_cluster */ + +s32 fat_alloc_cluster(struct super_block *sb, s32 num_alloc, CHAIN_T *p_chain) +{ + int i, num_clusters = 0; + u32 new_clu, last_clu = CLUSTER_32(~0), read_clu; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + new_clu = p_chain->dir; + if (new_clu == CLUSTER_32(~0)) + new_clu = p_fs->clu_srch_ptr; + else if (new_clu >= p_fs->num_clusters) + new_clu = 2; + + __set_sb_dirty(sb); + + p_chain->dir = CLUSTER_32(~0); + + for (i = 2; i < p_fs->num_clusters; i++) { + if (FAT_read(sb, new_clu, &read_clu) != 0) + return -1; + + if (read_clu == CLUSTER_32(0)) { + if (FAT_write(sb, new_clu, CLUSTER_32(~0)) < 0) + return -1; + num_clusters++; + + if (p_chain->dir == CLUSTER_32(~0)) + p_chain->dir = new_clu; + else { + if (FAT_write(sb, last_clu, new_clu) < 0) + return -1; + } + + last_clu = new_clu; + + if ((--num_alloc) == 0) { + p_fs->clu_srch_ptr = new_clu; + if (p_fs->used_clusters != (u32) ~0) + p_fs->used_clusters += num_clusters; + + return num_clusters; + } + } + if ((++new_clu) >= p_fs->num_clusters) + new_clu = 2; + } + + p_fs->clu_srch_ptr = new_clu; + if (p_fs->used_clusters != (u32) ~0) + p_fs->used_clusters += num_clusters; + + return num_clusters; +} /* end of fat_alloc_cluster */ + +s32 exfat_alloc_cluster(struct super_block *sb, s32 num_alloc, CHAIN_T *p_chain) +{ + s32 num_clusters = 0; + u32 hint_clu, new_clu, last_clu = CLUSTER_32(~0); + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + hint_clu = p_chain->dir; + if (hint_clu == CLUSTER_32(~0)) { + hint_clu = test_alloc_bitmap(sb, p_fs->clu_srch_ptr-2); + if (hint_clu == CLUSTER_32(~0)) + return 0; + } else if (hint_clu >= p_fs->num_clusters) { + hint_clu = 2; + p_chain->flags = 0x01; + } + + __set_sb_dirty(sb); + + p_chain->dir = CLUSTER_32(~0); + + while ((new_clu = test_alloc_bitmap(sb, hint_clu-2)) != CLUSTER_32(~0)) { + if (new_clu != hint_clu) { + if (p_chain->flags == 0x03) { + exfat_chain_cont_cluster(sb, p_chain->dir, num_clusters); + p_chain->flags = 0x01; + } + } + + if (set_alloc_bitmap(sb, new_clu-2) != FFS_SUCCESS) + return -1; + + num_clusters++; + + if (p_chain->flags == 0x01) { + if (FAT_write(sb, new_clu, CLUSTER_32(~0)) < 0) + return -1; + } + + if (p_chain->dir == CLUSTER_32(~0)) { + p_chain->dir = new_clu; + } else { + if (p_chain->flags == 0x01) { + if (FAT_write(sb, last_clu, new_clu) < 0) + return -1; + } + } + last_clu = new_clu; + + if ((--num_alloc) == 0) { + p_fs->clu_srch_ptr = hint_clu; + if (p_fs->used_clusters != (u32) ~0) + p_fs->used_clusters += num_clusters; + + p_chain->size += num_clusters; + return num_clusters; + } + + hint_clu = new_clu + 1; + if (hint_clu >= p_fs->num_clusters) { + hint_clu = 2; + + if (p_chain->flags == 0x03) { + exfat_chain_cont_cluster(sb, p_chain->dir, num_clusters); + p_chain->flags = 0x01; + } + } + } + + p_fs->clu_srch_ptr = hint_clu; + if (p_fs->used_clusters != (u32) ~0) + p_fs->used_clusters += num_clusters; + + p_chain->size += num_clusters; + return num_clusters; +} /* end of exfat_alloc_cluster */ + +void fat_free_cluster(struct super_block *sb, CHAIN_T *p_chain, s32 do_relse) +{ + s32 num_clusters = 0; + u32 clu, prev; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + int i; + sector_t sector; + + if ((p_chain->dir == CLUSTER_32(0)) || (p_chain->dir == CLUSTER_32(~0))) + return; + __set_sb_dirty(sb); + clu = p_chain->dir; + + if (p_chain->size <= 0) + return; + + do { + if (p_fs->dev_ejected) + break; + + if (do_relse) { + sector = START_SECTOR(clu); + for (i = 0; i < p_fs->sectors_per_clu; i++) + buf_release(sb, sector+i); + } + + prev = clu; + if (FAT_read(sb, clu, &clu) == -1) + break; + + if (FAT_write(sb, prev, CLUSTER_32(0)) < 0) + break; + num_clusters++; + + } while (clu != CLUSTER_32(~0)); + + if (p_fs->used_clusters != (u32) ~0) + p_fs->used_clusters -= num_clusters; +} /* end of fat_free_cluster */ + +void exfat_free_cluster(struct super_block *sb, CHAIN_T *p_chain, s32 do_relse) +{ + s32 num_clusters = 0; + u32 clu; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + int i; + sector_t sector; + + if ((p_chain->dir == CLUSTER_32(0)) || (p_chain->dir == CLUSTER_32(~0))) + return; + + if (p_chain->size <= 0) { + printk(KERN_ERR "[EXFAT] free_cluster : skip free-req clu:%u, " + "because of zero-size truncation\n" + ,p_chain->dir); + return; + } + + __set_sb_dirty(sb); + clu = p_chain->dir; + + if (p_chain->flags == 0x03) { + do { + if (do_relse) { + sector = START_SECTOR(clu); + for (i = 0; i < p_fs->sectors_per_clu; i++) + buf_release(sb, sector+i); + } + + if (clr_alloc_bitmap(sb, clu-2) != FFS_SUCCESS) + break; + clu++; + + num_clusters++; + } while (num_clusters < p_chain->size); + } else { + do { + if (p_fs->dev_ejected) + break; + + if (do_relse) { + sector = START_SECTOR(clu); + for (i = 0; i < p_fs->sectors_per_clu; i++) + buf_release(sb, sector+i); + } + + if (clr_alloc_bitmap(sb, clu-2) != FFS_SUCCESS) + break; + + if (FAT_read(sb, clu, &clu) == -1) + break; + num_clusters++; + } while ((clu != CLUSTER_32(0)) && (clu != CLUSTER_32(~0))); + } + + if (p_fs->used_clusters != (u32) ~0) + p_fs->used_clusters -= num_clusters; +} /* end of exfat_free_cluster */ + +u32 find_last_cluster(struct super_block *sb, CHAIN_T *p_chain) +{ + u32 clu, next; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + clu = p_chain->dir; + + if (p_chain->flags == 0x03) { + clu += p_chain->size - 1; + } else { + while ((FAT_read(sb, clu, &next) == 0) && (next != CLUSTER_32(~0))) { + if (p_fs->dev_ejected) + break; + clu = next; + } + } + + return clu; +} /* end of find_last_cluster */ + +s32 count_num_clusters(struct super_block *sb, CHAIN_T *p_chain) +{ + int i, count = 0; + u32 clu; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + if ((p_chain->dir == CLUSTER_32(0)) || (p_chain->dir == CLUSTER_32(~0))) + return 0; + + clu = p_chain->dir; + + if (p_chain->flags == 0x03) { + count = p_chain->size; + } else { + for (i = 2; i < p_fs->num_clusters; i++) { + count++; + if (FAT_read(sb, clu, &clu) != 0) + return 0; + if (clu == CLUSTER_32(~0)) + break; + } + } + + return count; +} /* end of count_num_clusters */ + +s32 fat_count_used_clusters(struct super_block *sb) +{ + int i, count = 0; + u32 clu; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + for (i = 2; i < p_fs->num_clusters; i++) { + if (FAT_read(sb, i, &clu) != 0) + break; + if (clu != CLUSTER_32(0)) + count++; + } + + return count; +} /* end of fat_count_used_clusters */ + +s32 exfat_count_used_clusters(struct super_block *sb) +{ + int i, map_i, map_b, count = 0; + u8 k; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + + map_i = map_b = 0; + + for (i = 2; i < p_fs->num_clusters; i += 8) { + k = *(((u8 *) p_fs->vol_amap[map_i]->b_data) + map_b); + count += used_bit[k]; + + if ((++map_b) >= p_bd->sector_size) { + map_i++; + map_b = 0; + } + } + + return count; +} /* end of exfat_count_used_clusters */ + +void exfat_chain_cont_cluster(struct super_block *sb, u32 chain, s32 len) +{ + if (len == 0) + return; + + while (len > 1) { + if (FAT_write(sb, chain, chain+1) < 0) + break; + chain++; + len--; + } + FAT_write(sb, chain, CLUSTER_32(~0)); +} /* end of exfat_chain_cont_cluster */ + +/* + * Allocation Bitmap Management Functions + */ + +s32 load_alloc_bitmap(struct super_block *sb) +{ + int i, j, ret; + u32 map_size; + u32 type; + sector_t sector; + CHAIN_T clu; + BMAP_DENTRY_T *ep; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + + clu.dir = p_fs->root_dir; + clu.flags = 0x01; + + while (clu.dir != CLUSTER_32(~0)) { + if (p_fs->dev_ejected) + break; + + for (i = 0; i < p_fs->dentries_per_clu; i++) { + ep = (BMAP_DENTRY_T *) get_entry_in_dir(sb, &clu, i, NULL); + if (!ep) + return FFS_MEDIAERR; + + type = p_fs->fs_func->get_entry_type((DENTRY_T *) ep); + + if (type == TYPE_UNUSED) + break; + if (type != TYPE_BITMAP) + continue; + + if (ep->flags == 0x0) { + p_fs->map_clu = GET32_A(ep->start_clu); + map_size = (u32) GET64_A(ep->size); + + p_fs->map_sectors = ((map_size-1) >> p_bd->sector_size_bits) + 1; + + p_fs->vol_amap = (struct buffer_head **) kmalloc(sizeof(struct buffer_head *) * p_fs->map_sectors, GFP_KERNEL); + if (p_fs->vol_amap == NULL) + return FFS_MEMORYERR; + + sector = START_SECTOR(p_fs->map_clu); + + for (j = 0; j < p_fs->map_sectors; j++) { + p_fs->vol_amap[j] = NULL; + ret = sector_read(sb, sector+j, &(p_fs->vol_amap[j]), 1); + if (ret != FFS_SUCCESS) { + /* release all buffers and free vol_amap */ + i = 0; + while (i < j) + brelse(p_fs->vol_amap[i++]); + + if (p_fs->vol_amap) + kfree(p_fs->vol_amap); + p_fs->vol_amap = NULL; + return ret; + } + } + + p_fs->pbr_bh = NULL; + return FFS_SUCCESS; + } + } + + if (FAT_read(sb, clu.dir, &(clu.dir)) != 0) + return FFS_MEDIAERR; + } + + return FFS_FORMATERR; +} /* end of load_alloc_bitmap */ + +void free_alloc_bitmap(struct super_block *sb) +{ + int i; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + brelse(p_fs->pbr_bh); + + for (i = 0; i < p_fs->map_sectors; i++) + __brelse(p_fs->vol_amap[i]); + + if (p_fs->vol_amap) + kfree(p_fs->vol_amap); + p_fs->vol_amap = NULL; +} /* end of free_alloc_bitmap */ + +s32 set_alloc_bitmap(struct super_block *sb, u32 clu) +{ + int i, b; + sector_t sector; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + + i = clu >> (p_bd->sector_size_bits + 3); + b = clu & ((p_bd->sector_size << 3) - 1); + + sector = START_SECTOR(p_fs->map_clu) + i; + + exfat_bitmap_set((u8 *) p_fs->vol_amap[i]->b_data, b); + + return sector_write(sb, sector, p_fs->vol_amap[i], 0); +} /* end of set_alloc_bitmap */ + +s32 clr_alloc_bitmap(struct super_block *sb, u32 clu) +{ + int i, b; + sector_t sector; +#ifdef CONFIG_EXFAT_DISCARD + struct exfat_sb_info *sbi = EXFAT_SB(sb); + struct exfat_mount_options *opts = &sbi->options; + int ret; +#endif /* CONFIG_EXFAT_DISCARD */ + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + + i = clu >> (p_bd->sector_size_bits + 3); + b = clu & ((p_bd->sector_size << 3) - 1); + + sector = START_SECTOR(p_fs->map_clu) + i; + + exfat_bitmap_clear((u8 *) p_fs->vol_amap[i]->b_data, b); + + return sector_write(sb, sector, p_fs->vol_amap[i], 0); + +#ifdef CONFIG_EXFAT_DISCARD + if (opts->discard) { +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37) + ret = sb_issue_discard(sb, START_SECTOR(clu), (1 << p_fs->sectors_per_clu_bits)); +#else + ret = sb_issue_discard(sb, START_SECTOR(clu), (1 << p_fs->sectors_per_clu_bits), GFP_NOFS, 0); +#endif + if (ret == -EOPNOTSUPP) { + printk(KERN_WARNING "discard not supported by device, disabling"); + opts->discard = 0; + } + } +#endif /* CONFIG_EXFAT_DISCARD */ +} /* end of clr_alloc_bitmap */ + +u32 test_alloc_bitmap(struct super_block *sb, u32 clu) +{ + int i, map_i, map_b; + u32 clu_base, clu_free; + u8 k, clu_mask; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + + clu_base = (clu & ~(0x7)) + 2; + clu_mask = (1 << (clu - clu_base + 2)) - 1; + + map_i = clu >> (p_bd->sector_size_bits + 3); + map_b = (clu >> 3) & p_bd->sector_size_mask; + + for (i = 2; i < p_fs->num_clusters; i += 8) { + k = *(((u8 *) p_fs->vol_amap[map_i]->b_data) + map_b); + if (clu_mask > 0) { + k |= clu_mask; + clu_mask = 0; + } + if (k < 0xFF) { + clu_free = clu_base + free_bit[k]; + if (clu_free < p_fs->num_clusters) + return clu_free; + } + clu_base += 8; + + if (((++map_b) >= p_bd->sector_size) || (clu_base >= p_fs->num_clusters)) { + if ((++map_i) >= p_fs->map_sectors) { + clu_base = 2; + map_i = 0; + } + map_b = 0; + } + } + + return CLUSTER_32(~0); +} /* end of test_alloc_bitmap */ + +void sync_alloc_bitmap(struct super_block *sb) +{ + int i; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + if (p_fs->vol_amap == NULL) + return; + + for (i = 0; i < p_fs->map_sectors; i++) + sync_dirty_buffer(p_fs->vol_amap[i]); +} /* end of sync_alloc_bitmap */ + +/* + * Upcase table Management Functions + */ +s32 __load_upcase_table(struct super_block *sb, sector_t sector, u32 num_sectors, u32 utbl_checksum) +{ + int i, ret = FFS_ERROR; + u32 j; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + struct buffer_head *tmp_bh = NULL; + sector_t end_sector = num_sectors + sector; + + u8 skip = FALSE; + u32 index = 0; + u16 uni = 0; + u16 **upcase_table; + + u32 checksum = 0; + + upcase_table = p_fs->vol_utbl = (u16 **) kmalloc(UTBL_COL_COUNT * sizeof(u16 *), GFP_KERNEL); + if (upcase_table == NULL) + return FFS_MEMORYERR; + memset(upcase_table, 0, UTBL_COL_COUNT * sizeof(u16 *)); + + while (sector < end_sector) { + ret = sector_read(sb, sector, &tmp_bh, 1); + if (ret != FFS_SUCCESS) { + DPRINTK("sector read (0x%llX)fail\n", (unsigned long long)sector); + goto error; + } + sector++; + + for (i = 0; i < p_bd->sector_size && index <= 0xFFFF; i += 2) { + uni = GET16(((u8 *) tmp_bh->b_data)+i); + + checksum = ((checksum & 1) ? 0x80000000 : 0) + (checksum >> 1) + *(((u8 *) tmp_bh->b_data)+i); + checksum = ((checksum & 1) ? 0x80000000 : 0) + (checksum >> 1) + *(((u8 *) tmp_bh->b_data)+(i+1)); + + if (skip) { + DPRINTK("skip from 0x%X ", index); + index += uni; + DPRINTK("to 0x%X (amount of 0x%X)\n", index, uni); + skip = FALSE; + } else if (uni == index) + index++; + else if (uni == 0xFFFF) + skip = TRUE; + else { /* uni != index , uni != 0xFFFF */ + u16 col_index = get_col_index(index); + + if (upcase_table[col_index] == NULL) { + DPRINTK("alloc = 0x%X\n", col_index); + upcase_table[col_index] = (u16 *) kmalloc(UTBL_ROW_COUNT * sizeof(u16), GFP_KERNEL); + if (upcase_table[col_index] == NULL) { + ret = FFS_MEMORYERR; + goto error; + } + + for (j = 0; j < UTBL_ROW_COUNT; j++) + upcase_table[col_index][j] = (col_index << LOW_INDEX_BIT) | j; + } + + upcase_table[col_index][get_row_index(index)] = uni; + index++; + } + } + } + if (index >= 0xFFFF && utbl_checksum == checksum) { + if (tmp_bh) + brelse(tmp_bh); + return FFS_SUCCESS; + } + ret = FFS_ERROR; +error: + if (tmp_bh) + brelse(tmp_bh); + free_upcase_table(sb); + return ret; +} + +s32 __load_default_upcase_table(struct super_block *sb) +{ + int i, ret = FFS_ERROR; + u32 j; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + u8 skip = FALSE; + u32 index = 0; + u16 uni = 0; + u16 **upcase_table; + + upcase_table = p_fs->vol_utbl = (u16 **) kmalloc(UTBL_COL_COUNT * sizeof(u16 *), GFP_KERNEL); + if (upcase_table == NULL) + return FFS_MEMORYERR; + memset(upcase_table, 0, UTBL_COL_COUNT * sizeof(u16 *)); + + for (i = 0; index <= 0xFFFF && i < NUM_UPCASE*2; i += 2) { + uni = GET16(uni_upcase + i); + if (skip) { + DPRINTK("skip from 0x%X ", index); + index += uni; + DPRINTK("to 0x%X (amount of 0x%X)\n", index, uni); + skip = FALSE; + } else if (uni == index) + index++; + else if (uni == 0xFFFF) + skip = TRUE; + else { /* uni != index , uni != 0xFFFF */ + u16 col_index = get_col_index(index); + + if (upcase_table[col_index] == NULL) { + DPRINTK("alloc = 0x%X\n", col_index); + upcase_table[col_index] = (u16 *) kmalloc(UTBL_ROW_COUNT * sizeof(u16), GFP_KERNEL); + if (upcase_table[col_index] == NULL) { + ret = FFS_MEMORYERR; + goto error; + } + + for (j = 0; j < UTBL_ROW_COUNT; j++) + upcase_table[col_index][j] = (col_index << LOW_INDEX_BIT) | j; + } + + upcase_table[col_index][get_row_index(index)] = uni; + index++; + } + } + + if (index >= 0xFFFF) + return FFS_SUCCESS; + +error: + /* FATAL error: default upcase table has error */ + free_upcase_table(sb); + return ret; +} + +s32 load_upcase_table(struct super_block *sb) +{ + int i; + u32 tbl_clu, tbl_size; + sector_t sector; + u32 type, num_sectors; + CHAIN_T clu; + CASE_DENTRY_T *ep; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + + clu.dir = p_fs->root_dir; + clu.flags = 0x01; + + if (p_fs->dev_ejected) + return FFS_MEDIAERR; + + while (clu.dir != CLUSTER_32(~0)) { + for (i = 0; i < p_fs->dentries_per_clu; i++) { + ep = (CASE_DENTRY_T *) get_entry_in_dir(sb, &clu, i, NULL); + if (!ep) + return FFS_MEDIAERR; + + type = p_fs->fs_func->get_entry_type((DENTRY_T *) ep); + + if (type == TYPE_UNUSED) + break; + if (type != TYPE_UPCASE) + continue; + + tbl_clu = GET32_A(ep->start_clu); + tbl_size = (u32) GET64_A(ep->size); + + sector = START_SECTOR(tbl_clu); + num_sectors = ((tbl_size-1) >> p_bd->sector_size_bits) + 1; + if (__load_upcase_table(sb, sector, num_sectors, GET32_A(ep->checksum)) != FFS_SUCCESS) + break; + else + return FFS_SUCCESS; + } + if (FAT_read(sb, clu.dir, &(clu.dir)) != 0) + return FFS_MEDIAERR; + } + /* load default upcase table */ + return __load_default_upcase_table(sb); +} /* end of load_upcase_table */ + +void free_upcase_table(struct super_block *sb) +{ + u32 i; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + u16 **upcase_table; + + upcase_table = p_fs->vol_utbl; + for (i = 0; i < UTBL_COL_COUNT; i++) { + if (upcase_table[i]) + kfree(upcase_table[i]); + } + + if (p_fs->vol_utbl) + kfree(p_fs->vol_utbl); + p_fs->vol_utbl = NULL; +} /* end of free_upcase_table */ + +/* + * Directory Entry Management Functions + */ + +u32 fat_get_entry_type(DENTRY_T *p_entry) +{ + DOS_DENTRY_T *ep = (DOS_DENTRY_T *) p_entry; + + if (*(ep->name) == 0x0) + return TYPE_UNUSED; + + else if (*(ep->name) == 0xE5) + return TYPE_DELETED; + + else if (ep->attr == ATTR_EXTEND) + return TYPE_EXTEND; + + else if ((ep->attr & (ATTR_SUBDIR|ATTR_VOLUME)) == ATTR_VOLUME) + return TYPE_VOLUME; + + else if ((ep->attr & (ATTR_SUBDIR|ATTR_VOLUME)) == ATTR_SUBDIR) + return TYPE_DIR; + + return TYPE_FILE; +} /* end of fat_get_entry_type */ + +u32 exfat_get_entry_type(DENTRY_T *p_entry) +{ + FILE_DENTRY_T *ep = (FILE_DENTRY_T *) p_entry; + + if (ep->type == 0x0) { + return TYPE_UNUSED; + } else if (ep->type < 0x80) { + return TYPE_DELETED; + } else if (ep->type == 0x80) { + return TYPE_INVALID; + } else if (ep->type < 0xA0) { + if (ep->type == 0x81) { + return TYPE_BITMAP; + } else if (ep->type == 0x82) { + return TYPE_UPCASE; + } else if (ep->type == 0x83) { + return TYPE_VOLUME; + } else if (ep->type == 0x85) { + if (GET16_A(ep->attr) & ATTR_SUBDIR) + return TYPE_DIR; + else + return TYPE_FILE; + } + return TYPE_CRITICAL_PRI; + } else if (ep->type < 0xC0) { + if (ep->type == 0xA0) + return TYPE_GUID; + else if (ep->type == 0xA1) + return TYPE_PADDING; + else if (ep->type == 0xA2) + return TYPE_ACLTAB; + return TYPE_BENIGN_PRI; + } else if (ep->type < 0xE0) { + if (ep->type == 0xC0) + return TYPE_STREAM; + else if (ep->type == 0xC1) + return TYPE_EXTEND; + else if (ep->type == 0xC2) + return TYPE_ACL; + return TYPE_CRITICAL_SEC; + } + + return TYPE_BENIGN_SEC; +} /* end of exfat_get_entry_type */ + +void fat_set_entry_type(DENTRY_T *p_entry, u32 type) +{ + DOS_DENTRY_T *ep = (DOS_DENTRY_T *) p_entry; + + if (type == TYPE_UNUSED) + *(ep->name) = 0x0; + + else if (type == TYPE_DELETED) + *(ep->name) = 0xE5; + + else if (type == TYPE_EXTEND) + ep->attr = ATTR_EXTEND; + + else if (type == TYPE_DIR) + ep->attr = ATTR_SUBDIR; + + else if (type == TYPE_FILE) + ep->attr = ATTR_ARCHIVE; + + else if (type == TYPE_SYMLINK) + ep->attr = ATTR_ARCHIVE | ATTR_SYMLINK; +} /* end of fat_set_entry_type */ + +void exfat_set_entry_type(DENTRY_T *p_entry, u32 type) +{ + FILE_DENTRY_T *ep = (FILE_DENTRY_T *) p_entry; + + if (type == TYPE_UNUSED) { + ep->type = 0x0; + } else if (type == TYPE_DELETED) { + ep->type &= ~0x80; + } else if (type == TYPE_STREAM) { + ep->type = 0xC0; + } else if (type == TYPE_EXTEND) { + ep->type = 0xC1; + } else if (type == TYPE_BITMAP) { + ep->type = 0x81; + } else if (type == TYPE_UPCASE) { + ep->type = 0x82; + } else if (type == TYPE_VOLUME) { + ep->type = 0x83; + } else if (type == TYPE_DIR) { + ep->type = 0x85; + SET16_A(ep->attr, ATTR_SUBDIR); + } else if (type == TYPE_FILE) { + ep->type = 0x85; + SET16_A(ep->attr, ATTR_ARCHIVE); + } else if (type == TYPE_SYMLINK) { + ep->type = 0x85; + SET16_A(ep->attr, ATTR_ARCHIVE | ATTR_SYMLINK); + } +} /* end of exfat_set_entry_type */ + +u32 fat_get_entry_attr(DENTRY_T *p_entry) +{ + DOS_DENTRY_T *ep = (DOS_DENTRY_T *) p_entry; + return (u32) ep->attr; +} /* end of fat_get_entry_attr */ + +u32 exfat_get_entry_attr(DENTRY_T *p_entry) +{ + FILE_DENTRY_T *ep = (FILE_DENTRY_T *) p_entry; + return (u32) GET16_A(ep->attr); +} /* end of exfat_get_entry_attr */ + +void fat_set_entry_attr(DENTRY_T *p_entry, u32 attr) +{ + DOS_DENTRY_T *ep = (DOS_DENTRY_T *) p_entry; + ep->attr = (u8) attr; +} /* end of fat_set_entry_attr */ + +void exfat_set_entry_attr(DENTRY_T *p_entry, u32 attr) +{ + FILE_DENTRY_T *ep = (FILE_DENTRY_T *) p_entry; + SET16_A(ep->attr, (u16) attr); +} /* end of exfat_set_entry_attr */ + +u8 fat_get_entry_flag(DENTRY_T *p_entry) +{ + return 0x01; +} /* end of fat_get_entry_flag */ + +u8 exfat_get_entry_flag(DENTRY_T *p_entry) +{ + STRM_DENTRY_T *ep = (STRM_DENTRY_T *) p_entry; + return ep->flags; +} /* end of exfat_get_entry_flag */ + +void fat_set_entry_flag(DENTRY_T *p_entry, u8 flags) +{ +} /* end of fat_set_entry_flag */ + +void exfat_set_entry_flag(DENTRY_T *p_entry, u8 flags) +{ + STRM_DENTRY_T *ep = (STRM_DENTRY_T *) p_entry; + ep->flags = flags; +} /* end of exfat_set_entry_flag */ + +u32 fat_get_entry_clu0(DENTRY_T *p_entry) +{ + DOS_DENTRY_T *ep = (DOS_DENTRY_T *) p_entry; + return ((u32) GET16_A(ep->start_clu_hi) << 16) | GET16_A(ep->start_clu_lo); +} /* end of fat_get_entry_clu0 */ + +u32 exfat_get_entry_clu0(DENTRY_T *p_entry) +{ + STRM_DENTRY_T *ep = (STRM_DENTRY_T *) p_entry; + return GET32_A(ep->start_clu); +} /* end of exfat_get_entry_clu0 */ + +void fat_set_entry_clu0(DENTRY_T *p_entry, u32 start_clu) +{ + DOS_DENTRY_T *ep = (DOS_DENTRY_T *) p_entry; + SET16_A(ep->start_clu_lo, CLUSTER_16(start_clu)); + SET16_A(ep->start_clu_hi, CLUSTER_16(start_clu >> 16)); +} /* end of fat_set_entry_clu0 */ + +void exfat_set_entry_clu0(DENTRY_T *p_entry, u32 start_clu) +{ + STRM_DENTRY_T *ep = (STRM_DENTRY_T *) p_entry; + SET32_A(ep->start_clu, start_clu); +} /* end of exfat_set_entry_clu0 */ + +u64 fat_get_entry_size(DENTRY_T *p_entry) +{ + DOS_DENTRY_T *ep = (DOS_DENTRY_T *) p_entry; + return (u64) GET32_A(ep->size); +} /* end of fat_get_entry_size */ + +u64 exfat_get_entry_size(DENTRY_T *p_entry) +{ + STRM_DENTRY_T *ep = (STRM_DENTRY_T *) p_entry; + return GET64_A(ep->valid_size); +} /* end of exfat_get_entry_size */ + +void fat_set_entry_size(DENTRY_T *p_entry, u64 size) +{ + DOS_DENTRY_T *ep = (DOS_DENTRY_T *) p_entry; + SET32_A(ep->size, (u32) size); +} /* end of fat_set_entry_size */ + +void exfat_set_entry_size(DENTRY_T *p_entry, u64 size) +{ + STRM_DENTRY_T *ep = (STRM_DENTRY_T *) p_entry; + SET64_A(ep->valid_size, size); + SET64_A(ep->size, size); +} /* end of exfat_set_entry_size */ + +void fat_get_entry_time(DENTRY_T *p_entry, TIMESTAMP_T *tp, u8 mode) +{ + u16 t = 0x00, d = 0x21; + DOS_DENTRY_T *ep = (DOS_DENTRY_T *) p_entry; + + switch (mode) { + case TM_CREATE: + t = GET16_A(ep->create_time); + d = GET16_A(ep->create_date); + break; + case TM_MODIFY: + t = GET16_A(ep->modify_time); + d = GET16_A(ep->modify_date); + break; + } + + tp->sec = (t & 0x001F) << 1; + tp->min = (t >> 5) & 0x003F; + tp->hour = (t >> 11); + tp->day = (d & 0x001F); + tp->mon = (d >> 5) & 0x000F; + tp->year = (d >> 9); +} /* end of fat_get_entry_time */ + +void exfat_get_entry_time(DENTRY_T *p_entry, TIMESTAMP_T *tp, u8 mode) +{ + u16 t = 0x00, d = 0x21; + FILE_DENTRY_T *ep = (FILE_DENTRY_T *) p_entry; + + switch (mode) { + case TM_CREATE: + t = GET16_A(ep->create_time); + d = GET16_A(ep->create_date); + break; + case TM_MODIFY: + t = GET16_A(ep->modify_time); + d = GET16_A(ep->modify_date); + break; + case TM_ACCESS: + t = GET16_A(ep->access_time); + d = GET16_A(ep->access_date); + break; + } + + tp->sec = (t & 0x001F) << 1; + tp->min = (t >> 5) & 0x003F; + tp->hour = (t >> 11); + tp->day = (d & 0x001F); + tp->mon = (d >> 5) & 0x000F; + tp->year = (d >> 9); +} /* end of exfat_get_entry_time */ + +void fat_set_entry_time(DENTRY_T *p_entry, TIMESTAMP_T *tp, u8 mode) +{ + u16 t, d; + DOS_DENTRY_T *ep = (DOS_DENTRY_T *) p_entry; + + t = (tp->hour << 11) | (tp->min << 5) | (tp->sec >> 1); + d = (tp->year << 9) | (tp->mon << 5) | tp->day; + + switch (mode) { + case TM_CREATE: + SET16_A(ep->create_time, t); + SET16_A(ep->create_date, d); + break; + case TM_MODIFY: + SET16_A(ep->modify_time, t); + SET16_A(ep->modify_date, d); + break; + } +} /* end of fat_set_entry_time */ + +void exfat_set_entry_time(DENTRY_T *p_entry, TIMESTAMP_T *tp, u8 mode) +{ + u16 t, d; + FILE_DENTRY_T *ep = (FILE_DENTRY_T *) p_entry; + + t = (tp->hour << 11) | (tp->min << 5) | (tp->sec >> 1); + d = (tp->year << 9) | (tp->mon << 5) | tp->day; + + switch (mode) { + case TM_CREATE: + SET16_A(ep->create_time, t); + SET16_A(ep->create_date, d); + break; + case TM_MODIFY: + SET16_A(ep->modify_time, t); + SET16_A(ep->modify_date, d); + break; + case TM_ACCESS: + SET16_A(ep->access_time, t); + SET16_A(ep->access_date, d); + break; + } +} /* end of exfat_set_entry_time */ + +s32 fat_init_dir_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, u32 type, + u32 start_clu, u64 size) +{ + sector_t sector; + DOS_DENTRY_T *dos_ep; + + dos_ep = (DOS_DENTRY_T *) get_entry_in_dir(sb, p_dir, entry, §or); + if (!dos_ep) + return FFS_MEDIAERR; + + init_dos_entry(dos_ep, type, start_clu); + buf_modify(sb, sector); + + return FFS_SUCCESS; +} /* end of fat_init_dir_entry */ + +s32 exfat_init_dir_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, u32 type, + u32 start_clu, u64 size) +{ + sector_t sector; + u8 flags; + FILE_DENTRY_T *file_ep; + STRM_DENTRY_T *strm_ep; + + flags = (type == TYPE_FILE) ? 0x01 : 0x03; + + /* we cannot use get_entry_set_in_dir here because file ep is not initialized yet */ + file_ep = (FILE_DENTRY_T *) get_entry_in_dir(sb, p_dir, entry, §or); + if (!file_ep) + return FFS_MEDIAERR; + + strm_ep = (STRM_DENTRY_T *) get_entry_in_dir(sb, p_dir, entry+1, §or); + if (!strm_ep) + return FFS_MEDIAERR; + + init_file_entry(file_ep, type); + buf_modify(sb, sector); + + init_strm_entry(strm_ep, flags, start_clu, size); + buf_modify(sb, sector); + + return FFS_SUCCESS; +} /* end of exfat_init_dir_entry */ + +s32 fat_init_ext_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, s32 num_entries, + UNI_NAME_T *p_uniname, DOS_NAME_T *p_dosname) +{ + int i; + sector_t sector; + u8 chksum; + u16 *uniname = p_uniname->name; + DOS_DENTRY_T *dos_ep; + EXT_DENTRY_T *ext_ep; + + dos_ep = (DOS_DENTRY_T *) get_entry_in_dir(sb, p_dir, entry, §or); + if (!dos_ep) + return FFS_MEDIAERR; + + dos_ep->lcase = p_dosname->name_case; + memcpy(dos_ep->name, p_dosname->name, DOS_NAME_LENGTH); + buf_modify(sb, sector); + + if ((--num_entries) > 0) { + chksum = calc_checksum_1byte((void *) dos_ep->name, DOS_NAME_LENGTH, 0); + + for (i = 1; i < num_entries; i++) { + ext_ep = (EXT_DENTRY_T *) get_entry_in_dir(sb, p_dir, entry-i, §or); + if (!ext_ep) + return FFS_MEDIAERR; + + init_ext_entry(ext_ep, i, chksum, uniname); + buf_modify(sb, sector); + uniname += 13; + } + + ext_ep = (EXT_DENTRY_T *) get_entry_in_dir(sb, p_dir, entry-i, §or); + if (!ext_ep) + return FFS_MEDIAERR; + + init_ext_entry(ext_ep, i+0x40, chksum, uniname); + buf_modify(sb, sector); + } + + return FFS_SUCCESS; +} /* end of fat_init_ext_entry */ + +s32 exfat_init_ext_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, s32 num_entries, + UNI_NAME_T *p_uniname, DOS_NAME_T *p_dosname) +{ + int i; + sector_t sector; + u16 *uniname = p_uniname->name; + FILE_DENTRY_T *file_ep; + STRM_DENTRY_T *strm_ep; + NAME_DENTRY_T *name_ep; + + file_ep = (FILE_DENTRY_T *) get_entry_in_dir(sb, p_dir, entry, §or); + if (!file_ep) + return FFS_MEDIAERR; + + file_ep->num_ext = (u8)(num_entries - 1); + buf_modify(sb, sector); + + strm_ep = (STRM_DENTRY_T *) get_entry_in_dir(sb, p_dir, entry+1, §or); + if (!strm_ep) + return FFS_MEDIAERR; + + strm_ep->name_len = p_uniname->name_len; + SET16_A(strm_ep->name_hash, p_uniname->name_hash); + buf_modify(sb, sector); + + for (i = 2; i < num_entries; i++) { + name_ep = (NAME_DENTRY_T *) get_entry_in_dir(sb, p_dir, entry+i, §or); + if (!name_ep) + return FFS_MEDIAERR; + + init_name_entry(name_ep, uniname); + buf_modify(sb, sector); + uniname += 15; + } + + update_dir_checksum(sb, p_dir, entry); + + return FFS_SUCCESS; +} /* end of exfat_init_ext_entry */ + +void init_dos_entry(DOS_DENTRY_T *ep, u32 type, u32 start_clu) +{ + TIMESTAMP_T tm, *tp; + + fat_set_entry_type((DENTRY_T *) ep, type); + SET16_A(ep->start_clu_lo, CLUSTER_16(start_clu)); + SET16_A(ep->start_clu_hi, CLUSTER_16(start_clu >> 16)); + SET32_A(ep->size, 0); + + tp = tm_current(&tm); + fat_set_entry_time((DENTRY_T *) ep, tp, TM_CREATE); + fat_set_entry_time((DENTRY_T *) ep, tp, TM_MODIFY); + SET16_A(ep->access_date, 0); + ep->create_time_ms = 0; +} /* end of init_dos_entry */ + +void init_ext_entry(EXT_DENTRY_T *ep, s32 order, u8 chksum, u16 *uniname) +{ + int i; + u8 end = FALSE; + + fat_set_entry_type((DENTRY_T *) ep, TYPE_EXTEND); + ep->order = (u8) order; + ep->sysid = 0; + ep->checksum = chksum; + SET16_A(ep->start_clu, 0); + + for (i = 0; i < 10; i += 2) { + if (!end) { + SET16(ep->unicode_0_4+i, *uniname); + if (*uniname == 0x0) + end = TRUE; + else + uniname++; + } else { + SET16(ep->unicode_0_4+i, 0xFFFF); + } + } + + for (i = 0; i < 12; i += 2) { + if (!end) { + SET16_A(ep->unicode_5_10+i, *uniname); + if (*uniname == 0x0) + end = TRUE; + else + uniname++; + } else { + SET16_A(ep->unicode_5_10+i, 0xFFFF); + } + } + + for (i = 0; i < 4; i += 2) { + if (!end) { + SET16_A(ep->unicode_11_12+i, *uniname); + if (*uniname == 0x0) + end = TRUE; + else + uniname++; + } else { + SET16_A(ep->unicode_11_12+i, 0xFFFF); + } + } +} /* end of init_ext_entry */ + +void init_file_entry(FILE_DENTRY_T *ep, u32 type) +{ + TIMESTAMP_T tm, *tp; + + exfat_set_entry_type((DENTRY_T *) ep, type); + + tp = tm_current(&tm); + exfat_set_entry_time((DENTRY_T *) ep, tp, TM_CREATE); + exfat_set_entry_time((DENTRY_T *) ep, tp, TM_MODIFY); + exfat_set_entry_time((DENTRY_T *) ep, tp, TM_ACCESS); + ep->create_time_ms = 0; + ep->modify_time_ms = 0; + ep->access_time_ms = 0; +} /* end of init_file_entry */ + +void init_strm_entry(STRM_DENTRY_T *ep, u8 flags, u32 start_clu, u64 size) +{ + exfat_set_entry_type((DENTRY_T *) ep, TYPE_STREAM); + ep->flags = flags; + SET32_A(ep->start_clu, start_clu); + SET64_A(ep->valid_size, size); + SET64_A(ep->size, size); +} /* end of init_strm_entry */ + +void init_name_entry(NAME_DENTRY_T *ep, u16 *uniname) +{ + int i; + + exfat_set_entry_type((DENTRY_T *) ep, TYPE_EXTEND); + ep->flags = 0x0; + + for (i = 0; i < 30; i++, i++) { + SET16_A(ep->unicode_0_14+i, *uniname); + if (*uniname == 0x0) + break; + uniname++; + } +} /* end of init_name_entry */ + +void fat_delete_dir_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, s32 order, s32 num_entries) +{ + int i; + sector_t sector; + DENTRY_T *ep; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + for (i = num_entries-1; i >= order; i--) { + ep = get_entry_in_dir(sb, p_dir, entry-i, §or); + if (!ep) + return; + + p_fs->fs_func->set_entry_type(ep, TYPE_DELETED); + buf_modify(sb, sector); + } +} /* end of fat_delete_dir_entry */ + +void exfat_delete_dir_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, s32 order, s32 num_entries) +{ + int i; + sector_t sector; + DENTRY_T *ep; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + for (i = order; i < num_entries; i++) { + ep = get_entry_in_dir(sb, p_dir, entry+i, §or); + if (!ep) + return; + + p_fs->fs_func->set_entry_type(ep, TYPE_DELETED); + buf_modify(sb, sector); + } +} /* end of exfat_delete_dir_entry */ + +void update_dir_checksum(struct super_block *sb, CHAIN_T *p_dir, s32 entry) +{ + int i, num_entries; + sector_t sector; + u16 chksum; + FILE_DENTRY_T *file_ep; + DENTRY_T *ep; + + file_ep = (FILE_DENTRY_T *) get_entry_in_dir(sb, p_dir, entry, §or); + if (!file_ep) + return; + + buf_lock(sb, sector); + + num_entries = (s32) file_ep->num_ext + 1; + chksum = calc_checksum_2byte((void *) file_ep, DENTRY_SIZE, 0, CS_DIR_ENTRY); + + for (i = 1; i < num_entries; i++) { + ep = get_entry_in_dir(sb, p_dir, entry+i, NULL); + if (!ep) { + buf_unlock(sb, sector); + return; + } + + chksum = calc_checksum_2byte((void *) ep, DENTRY_SIZE, chksum, CS_DEFAULT); + } + + SET16_A(file_ep->checksum, chksum); + buf_modify(sb, sector); + buf_unlock(sb, sector); +} /* end of update_dir_checksum */ + +void update_dir_checksum_with_entry_set(struct super_block *sb, ENTRY_SET_CACHE_T *es) +{ + DENTRY_T *ep; + u16 chksum = 0; + s32 chksum_type = CS_DIR_ENTRY, i; + + ep = (DENTRY_T *)&(es->__buf); + for (i = 0; i < es->num_entries; i++) { + DPRINTK("update_dir_checksum_with_entry_set ep %p\n", ep); + chksum = calc_checksum_2byte((void *) ep, DENTRY_SIZE, chksum, chksum_type); + ep++; + chksum_type = CS_DEFAULT; + } + + ep = (DENTRY_T *)&(es->__buf); + SET16_A(((FILE_DENTRY_T *)ep)->checksum, chksum); + write_whole_entry_set(sb, es); +} + +static s32 _walk_fat_chain(struct super_block *sb, CHAIN_T *p_dir, s32 byte_offset, u32 *clu) +{ + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + s32 clu_offset; + u32 cur_clu; + + clu_offset = byte_offset >> p_fs->cluster_size_bits; + cur_clu = p_dir->dir; + + if (p_dir->flags == 0x03) { + cur_clu += clu_offset; + } else { + while (clu_offset > 0) { + if (FAT_read(sb, cur_clu, &cur_clu) == -1) + return FFS_MEDIAERR; + clu_offset--; + } + } + + if (clu) + *clu = cur_clu; + return FFS_SUCCESS; +} +s32 find_location(struct super_block *sb, CHAIN_T *p_dir, s32 entry, sector_t *sector, s32 *offset) +{ + s32 off, ret; + u32 clu = 0; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + + off = entry << DENTRY_SIZE_BITS; + + if (p_dir->dir == CLUSTER_32(0)) { /* FAT16 root_dir */ + *offset = off & p_bd->sector_size_mask; + *sector = off >> p_bd->sector_size_bits; + *sector += p_fs->root_start_sector; + } else { + ret = _walk_fat_chain(sb, p_dir, off, &clu); + if (ret != FFS_SUCCESS) + return ret; + + off &= p_fs->cluster_size - 1; /* byte offset in cluster */ + + *offset = off & p_bd->sector_size_mask; /* byte offset in sector */ + *sector = off >> p_bd->sector_size_bits; /* sector offset in cluster */ + *sector += START_SECTOR(clu); + } + return FFS_SUCCESS; +} /* end of find_location */ + +DENTRY_T *get_entry_with_sector(struct super_block *sb, sector_t sector, s32 offset) +{ + u8 *buf; + + buf = buf_getblk(sb, sector); + + if (buf == NULL) + return NULL; + + return (DENTRY_T *)(buf + offset); +} /* end of get_entry_with_sector */ + +DENTRY_T *get_entry_in_dir(struct super_block *sb, CHAIN_T *p_dir, s32 entry, sector_t *sector) +{ + s32 off; + sector_t sec; + u8 *buf; + + if (find_location(sb, p_dir, entry, &sec, &off) != FFS_SUCCESS) + return NULL; + + buf = buf_getblk(sb, sec); + + if (buf == NULL) + return NULL; + + if (sector != NULL) + *sector = sec; + return (DENTRY_T *)(buf + off); +} /* end of get_entry_in_dir */ + + +/* returns a set of dentries for a file or dir. + * Note that this is a copy (dump) of dentries so that user should call write_entry_set() + * to apply changes made in this entry set to the real device. + * in: + * sb+p_dir+entry: indicates a file/dir + * type: specifies how many dentries should be included. + * out: + * file_ep: will point the first dentry(= file dentry) on success + * return: + * pointer of entry set on success, + * NULL on failure. + */ + +#define ES_MODE_STARTED 0 +#define ES_MODE_GET_FILE_ENTRY 1 +#define ES_MODE_GET_STRM_ENTRY 2 +#define ES_MODE_GET_NAME_ENTRY 3 +#define ES_MODE_GET_CRITICAL_SEC_ENTRY 4 +ENTRY_SET_CACHE_T *get_entry_set_in_dir(struct super_block *sb, CHAIN_T *p_dir, s32 entry, u32 type, DENTRY_T **file_ep) +{ + s32 off, ret, byte_offset; + u32 clu = 0; + sector_t sec; + u32 entry_type; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + ENTRY_SET_CACHE_T *es = NULL; + DENTRY_T *ep, *pos; + u8 *buf; + u8 num_entries; + s32 mode = ES_MODE_STARTED; + + DPRINTK("get_entry_set_in_dir entered\n"); + DPRINTK("p_dir dir %u flags %x size %d\n", p_dir->dir, p_dir->flags, p_dir->size); + + byte_offset = entry << DENTRY_SIZE_BITS; + ret = _walk_fat_chain(sb, p_dir, byte_offset, &clu); + if (ret != FFS_SUCCESS) + return NULL; + + + byte_offset &= p_fs->cluster_size - 1; /* byte offset in cluster */ + + off = byte_offset & p_bd->sector_size_mask; /* byte offset in sector */ + sec = byte_offset >> p_bd->sector_size_bits; /* sector offset in cluster */ + sec += START_SECTOR(clu); + + buf = buf_getblk(sb, sec); + if (buf == NULL) + goto err_out; + + + ep = (DENTRY_T *)(buf + off); + entry_type = p_fs->fs_func->get_entry_type(ep); + + if ((entry_type != TYPE_FILE) + && (entry_type != TYPE_DIR)) + goto err_out; + + if (type == ES_ALL_ENTRIES) + num_entries = ((FILE_DENTRY_T *)ep)->num_ext+1; + else + num_entries = type; + + DPRINTK("trying to kmalloc %zx bytes for %d entries\n", offsetof(ENTRY_SET_CACHE_T, __buf) + (num_entries) * sizeof(DENTRY_T), num_entries); + es = kmalloc(offsetof(ENTRY_SET_CACHE_T, __buf) + (num_entries) * sizeof(DENTRY_T), GFP_KERNEL); + if (es == NULL) + goto err_out; + + es->num_entries = num_entries; + es->sector = sec; + es->offset = off; + es->alloc_flag = p_dir->flags; + + pos = (DENTRY_T *) &(es->__buf); + + while(num_entries) { + /* instead of copying whole sector, we will check every entry. + * this will provide minimum stablity and consistancy. + */ + + entry_type = p_fs->fs_func->get_entry_type(ep); + + if ((entry_type == TYPE_UNUSED) || (entry_type == TYPE_DELETED)) + goto err_out; + + switch (mode) { + case ES_MODE_STARTED: + if ((entry_type == TYPE_FILE) || (entry_type == TYPE_DIR)) + mode = ES_MODE_GET_FILE_ENTRY; + else + goto err_out; + break; + case ES_MODE_GET_FILE_ENTRY: + if (entry_type == TYPE_STREAM) + mode = ES_MODE_GET_STRM_ENTRY; + else + goto err_out; + break; + case ES_MODE_GET_STRM_ENTRY: + if (entry_type == TYPE_EXTEND) + mode = ES_MODE_GET_NAME_ENTRY; + else + goto err_out; + break; + case ES_MODE_GET_NAME_ENTRY: + if (entry_type == TYPE_EXTEND) + break; + else if (entry_type == TYPE_STREAM) + goto err_out; + else if (entry_type & TYPE_CRITICAL_SEC) + mode = ES_MODE_GET_CRITICAL_SEC_ENTRY; + else + goto err_out; + break; + case ES_MODE_GET_CRITICAL_SEC_ENTRY: + if ((entry_type == TYPE_EXTEND) || (entry_type == TYPE_STREAM)) + goto err_out; + else if ((entry_type & TYPE_CRITICAL_SEC) != TYPE_CRITICAL_SEC) + goto err_out; + break; + } + + memcpy(pos, ep, sizeof(DENTRY_T)); + + if (--num_entries == 0) + break; + + if (((off + DENTRY_SIZE) & p_bd->sector_size_mask) < (off & p_bd->sector_size_mask)) { + /* get the next sector */ + if (IS_LAST_SECTOR_IN_CLUSTER(sec)) { + if (es->alloc_flag == 0x03) { + clu++; + } else { + if (FAT_read(sb, clu, &clu) == -1) + goto err_out; + } + sec = START_SECTOR(clu); + } else { + sec++; + } + buf = buf_getblk(sb, sec); + if (buf == NULL) + goto err_out; + off = 0; + ep = (DENTRY_T *)(buf); + } else { + ep++; + off += DENTRY_SIZE; + } + pos++; + } + + if (file_ep) + *file_ep = (DENTRY_T *)&(es->__buf); + + DPRINTK("es sec %llu offset %d flags %d, num_entries %u buf ptr %p\n", + (unsigned long long)es->sector, es->offset, es->alloc_flag, + es->num_entries, &(es->__buf)); + DPRINTK("get_entry_set_in_dir exited %p\n", es); + return es; +err_out: + DPRINTK("get_entry_set_in_dir exited NULL (es %p)\n", es); + if (es) + kfree(es); + return NULL; +} + +void release_entry_set(ENTRY_SET_CACHE_T *es) +{ + DPRINTK("release_entry_set %p\n", es); + if (es) + kfree(es); +} + + +static s32 __write_partial_entries_in_entry_set(struct super_block *sb, ENTRY_SET_CACHE_T *es, sector_t sec, s32 off, u32 count) +{ + s32 num_entries, buf_off = (off - es->offset); + u32 remaining_byte_in_sector, copy_entries; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + u32 clu; + u8 *buf, *esbuf = (u8 *)&(es->__buf); + + DPRINTK("__write_partial_entries_in_entry_set entered\n"); + DPRINTK("es %p sec %llu off %d count %d\n", es, (unsigned long long)sec, off, count); + num_entries = count; + + while (num_entries) { + /* white per sector base */ + remaining_byte_in_sector = (1 << p_bd->sector_size_bits) - off; + copy_entries = MIN(remaining_byte_in_sector >> DENTRY_SIZE_BITS , num_entries); + buf = buf_getblk(sb, sec); + if (buf == NULL) + goto err_out; + DPRINTK("es->buf %p buf_off %u\n", esbuf, buf_off); + DPRINTK("copying %d entries from %p to sector %llu\n", copy_entries, (esbuf + buf_off), (unsigned long long)sec); + memcpy(buf + off, esbuf + buf_off, copy_entries << DENTRY_SIZE_BITS); + buf_modify(sb, sec); + num_entries -= copy_entries; + + if (num_entries) { + /* get next sector */ + if (IS_LAST_SECTOR_IN_CLUSTER(sec)) { + clu = GET_CLUSTER_FROM_SECTOR(sec); + if (es->alloc_flag == 0x03) { + clu++; + } else { + if (FAT_read(sb, clu, &clu) == -1) + goto err_out; + } + sec = START_SECTOR(clu); + } else { + sec++; + } + off = 0; + buf_off += copy_entries << DENTRY_SIZE_BITS; + } + } + + DPRINTK("__write_partial_entries_in_entry_set exited successfully\n"); + return FFS_SUCCESS; +err_out: + DPRINTK("__write_partial_entries_in_entry_set failed\n"); + return FFS_ERROR; +} + +/* write back all entries in entry set */ +s32 write_whole_entry_set(struct super_block *sb, ENTRY_SET_CACHE_T *es) +{ + return __write_partial_entries_in_entry_set(sb, es, es->sector, es->offset, es->num_entries); +} + +/* write back some entries in entry set */ +s32 write_partial_entries_in_entry_set (struct super_block *sb, ENTRY_SET_CACHE_T *es, DENTRY_T *ep, u32 count) +{ + s32 ret, byte_offset, off; + u32 clu=0; + sector_t sec; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + CHAIN_T dir; + + /* vaidity check */ + if (ep + count > ((DENTRY_T *)&(es->__buf)) + es->num_entries) + return FFS_ERROR; + + dir.dir = GET_CLUSTER_FROM_SECTOR(es->sector); + dir.flags = es->alloc_flag; + dir.size = 0xffffffff; /* XXX */ + + byte_offset = (es->sector - START_SECTOR(dir.dir)) << p_bd->sector_size_bits; + byte_offset += ((void **)ep - &(es->__buf)) + es->offset; + + ret =_walk_fat_chain(sb, &dir, byte_offset, &clu); + if (ret != FFS_SUCCESS) + return ret; + byte_offset &= p_fs->cluster_size - 1; /* byte offset in cluster */ + off = byte_offset & p_bd->sector_size_mask; /* byte offset in sector */ + sec = byte_offset >> p_bd->sector_size_bits; /* sector offset in cluster */ + sec += START_SECTOR(clu); + return __write_partial_entries_in_entry_set(sb, es, sec, off, count); +} + +/* search EMPTY CONTINUOUS "num_entries" entries */ +s32 search_deleted_or_unused_entry(struct super_block *sb, CHAIN_T *p_dir, s32 num_entries) +{ + int i, dentry, num_empty = 0; + s32 dentries_per_clu; + u32 type; + CHAIN_T clu; + DENTRY_T *ep; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */ + dentries_per_clu = p_fs->dentries_in_root; + else + dentries_per_clu = p_fs->dentries_per_clu; + + if (p_fs->hint_uentry.dir == p_dir->dir) { + if (p_fs->hint_uentry.entry == -1) + return -1; + + clu.dir = p_fs->hint_uentry.clu.dir; + clu.size = p_fs->hint_uentry.clu.size; + clu.flags = p_fs->hint_uentry.clu.flags; + + dentry = p_fs->hint_uentry.entry; + } else { + p_fs->hint_uentry.entry = -1; + + clu.dir = p_dir->dir; + clu.size = p_dir->size; + clu.flags = p_dir->flags; + + dentry = 0; + } + + while (clu.dir != CLUSTER_32(~0)) { + if (p_fs->dev_ejected) + break; + + if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */ + i = dentry % dentries_per_clu; + else + i = dentry & (dentries_per_clu-1); + + for (; i < dentries_per_clu; i++, dentry++) { + ep = get_entry_in_dir(sb, &clu, i, NULL); + if (!ep) + return -1; + + type = p_fs->fs_func->get_entry_type(ep); + + if (type == TYPE_UNUSED) { + num_empty++; + if (p_fs->hint_uentry.entry == -1) { + p_fs->hint_uentry.dir = p_dir->dir; + p_fs->hint_uentry.entry = dentry; + + p_fs->hint_uentry.clu.dir = clu.dir; + p_fs->hint_uentry.clu.size = clu.size; + p_fs->hint_uentry.clu.flags = clu.flags; + } + } else if (type == TYPE_DELETED) { + num_empty++; + } else { + num_empty = 0; + } + + if (num_empty >= num_entries) { + p_fs->hint_uentry.dir = CLUSTER_32(~0); + p_fs->hint_uentry.entry = -1; + + if (p_fs->vol_type == EXFAT) + return dentry - (num_entries-1); + else + return dentry; + } + } + + if (p_dir->dir == CLUSTER_32(0)) + break; /* FAT16 root_dir */ + + if (clu.flags == 0x03) { + if ((--clu.size) > 0) + clu.dir++; + else + clu.dir = CLUSTER_32(~0); + } else { + if (FAT_read(sb, clu.dir, &(clu.dir)) != 0) + return -1; + } + } + + return -1; +} /* end of search_deleted_or_unused_entry */ + +s32 find_empty_entry(struct inode *inode, CHAIN_T *p_dir, s32 num_entries) +{ + s32 ret, dentry; + u32 last_clu; + sector_t sector; + u64 size = 0; + CHAIN_T clu; + DENTRY_T *ep = NULL; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + FILE_ID_T *fid = &(EXFAT_I(inode)->fid); + + if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */ + return search_deleted_or_unused_entry(sb, p_dir, num_entries); + + while ((dentry = search_deleted_or_unused_entry(sb, p_dir, num_entries)) < 0) { + if (p_fs->dev_ejected) + break; + + if (p_fs->vol_type == EXFAT) { + if (p_dir->dir != p_fs->root_dir) + size = i_size_read(inode); + } + + last_clu = find_last_cluster(sb, p_dir); + clu.dir = last_clu + 1; + clu.size = 0; + clu.flags = p_dir->flags; + + /* (1) allocate a cluster */ + ret = p_fs->fs_func->alloc_cluster(sb, 1, &clu); + if (ret < 1) + return -1; + + if (clear_cluster(sb, clu.dir) != FFS_SUCCESS) + return -1; + + /* (2) append to the FAT chain */ + if (clu.flags != p_dir->flags) { + exfat_chain_cont_cluster(sb, p_dir->dir, p_dir->size); + p_dir->flags = 0x01; + p_fs->hint_uentry.clu.flags = 0x01; + } + if (clu.flags == 0x01) + if (FAT_write(sb, last_clu, clu.dir) < 0) + return -1; + + if (p_fs->hint_uentry.entry == -1) { + p_fs->hint_uentry.dir = p_dir->dir; + p_fs->hint_uentry.entry = p_dir->size << (p_fs->cluster_size_bits - DENTRY_SIZE_BITS); + + p_fs->hint_uentry.clu.dir = clu.dir; + p_fs->hint_uentry.clu.size = 0; + p_fs->hint_uentry.clu.flags = clu.flags; + } + p_fs->hint_uentry.clu.size++; + p_dir->size++; + + /* (3) update the directory entry */ + if (p_fs->vol_type == EXFAT) { + if (p_dir->dir != p_fs->root_dir) { + size += p_fs->cluster_size; + + ep = get_entry_in_dir(sb, &(fid->dir), fid->entry+1, §or); + if (!ep) + return -1; + p_fs->fs_func->set_entry_size(ep, size); + p_fs->fs_func->set_entry_flag(ep, p_dir->flags); + buf_modify(sb, sector); + + update_dir_checksum(sb, &(fid->dir), fid->entry); + } + } + + i_size_write(inode, i_size_read(inode)+p_fs->cluster_size); + EXFAT_I(inode)->mmu_private += p_fs->cluster_size; + EXFAT_I(inode)->fid.size += p_fs->cluster_size; + EXFAT_I(inode)->fid.flags = p_dir->flags; + inode->i_blocks += 1 << (p_fs->cluster_size_bits - 9); + } + + return dentry; +} /* end of find_empty_entry */ + +/* return values of fat_find_dir_entry() + >= 0 : return dir entiry position with the name in dir + -1 : (root dir, ".") it is the root dir itself + -2 : entry with the name does not exist */ +s32 fat_find_dir_entry(struct super_block *sb, CHAIN_T *p_dir, UNI_NAME_T *p_uniname, s32 num_entries, DOS_NAME_T *p_dosname, u32 type) +{ + int i, dentry = 0, lossy = FALSE, len; + s32 order = 0, is_feasible_entry = TRUE, has_ext_entry = FALSE; + s32 dentries_per_clu; + u32 entry_type; + u16 entry_uniname[14], *uniname = NULL, unichar; + CHAIN_T clu; + DENTRY_T *ep; + DOS_DENTRY_T *dos_ep; + EXT_DENTRY_T *ext_ep; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + if (p_dir->dir == p_fs->root_dir) { + if ((!nls_uniname_cmp(sb, p_uniname->name, (u16 *) UNI_CUR_DIR_NAME)) || + (!nls_uniname_cmp(sb, p_uniname->name, (u16 *) UNI_PAR_DIR_NAME))) + return -1; // special case, root directory itself + } + + if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */ + dentries_per_clu = p_fs->dentries_in_root; + else + dentries_per_clu = p_fs->dentries_per_clu; + + clu.dir = p_dir->dir; + clu.flags = p_dir->flags; + + while (clu.dir != CLUSTER_32(~0)) { + if (p_fs->dev_ejected) + break; + + for (i = 0; i < dentries_per_clu; i++, dentry++) { + ep = get_entry_in_dir(sb, &clu, i, NULL); + if (!ep) + return -2; + + entry_type = p_fs->fs_func->get_entry_type(ep); + + if ((entry_type == TYPE_FILE) || (entry_type == TYPE_DIR)) { + if ((type == TYPE_ALL) || (type == entry_type)) { + if (is_feasible_entry && has_ext_entry) + return dentry; + + dos_ep = (DOS_DENTRY_T *) ep; + if ((!lossy) && (!nls_dosname_cmp(sb, p_dosname->name, dos_ep->name))) + return dentry; + } + is_feasible_entry = TRUE; + has_ext_entry = FALSE; + } else if (entry_type == TYPE_EXTEND) { + if (is_feasible_entry) { + ext_ep = (EXT_DENTRY_T *) ep; + if (ext_ep->order > 0x40) { + order = (s32)(ext_ep->order - 0x40); + uniname = p_uniname->name + 13 * (order-1); + } else { + order = (s32) ext_ep->order; + uniname -= 13; + } + + len = extract_uni_name_from_ext_entry(ext_ep, entry_uniname, order); + + unichar = *(uniname+len); + *(uniname+len) = 0x0; + + if (nls_uniname_cmp(sb, uniname, entry_uniname)) + is_feasible_entry = FALSE; + + *(uniname+len) = unichar; + } + has_ext_entry = TRUE; + } else if (entry_type == TYPE_UNUSED) { + return -2; + } else { + is_feasible_entry = TRUE; + has_ext_entry = FALSE; + } + } + + if (p_dir->dir == CLUSTER_32(0)) + break; /* FAT16 root_dir */ + + if (FAT_read(sb, clu.dir, &(clu.dir)) != 0) + return -2; + } + + return -2; +} /* end of fat_find_dir_entry */ + +/* return values of exfat_find_dir_entry() + >= 0 : return dir entiry position with the name in dir + -1 : (root dir, ".") it is the root dir itself + -2 : entry with the name does not exist */ +s32 exfat_find_dir_entry(struct super_block *sb, CHAIN_T *p_dir, UNI_NAME_T *p_uniname, s32 num_entries, DOS_NAME_T *p_dosname, u32 type) +{ + int i = 0, dentry = 0, num_ext_entries = 0, len, step; + s32 order = 0, is_feasible_entry = FALSE; + s32 dentries_per_clu, num_empty = 0; + u32 entry_type; + u16 entry_uniname[16], *uniname = NULL, unichar; + CHAIN_T clu; + DENTRY_T *ep; + FILE_DENTRY_T *file_ep; + STRM_DENTRY_T *strm_ep; + NAME_DENTRY_T *name_ep; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + if (p_dir->dir == p_fs->root_dir) { + if ((!nls_uniname_cmp(sb, p_uniname->name, (u16 *) UNI_CUR_DIR_NAME)) || + (!nls_uniname_cmp(sb, p_uniname->name, (u16 *) UNI_PAR_DIR_NAME))) + return -1; // special case, root directory itself + } + + if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */ + dentries_per_clu = p_fs->dentries_in_root; + else + dentries_per_clu = p_fs->dentries_per_clu; + + clu.dir = p_dir->dir; + clu.size = p_dir->size; + clu.flags = p_dir->flags; + + p_fs->hint_uentry.dir = p_dir->dir; + p_fs->hint_uentry.entry = -1; + + while (clu.dir != CLUSTER_32(~0)) { + if (p_fs->dev_ejected) + break; + + while (i < dentries_per_clu) { + ep = get_entry_in_dir(sb, &clu, i, NULL); + if (!ep) + return -2; + + entry_type = p_fs->fs_func->get_entry_type(ep); + step = 1; + + if ((entry_type == TYPE_UNUSED) || (entry_type == TYPE_DELETED)) { + is_feasible_entry = FALSE; + + if (p_fs->hint_uentry.entry == -1) { + num_empty++; + + if (num_empty == 1) { + p_fs->hint_uentry.clu.dir = clu.dir; + p_fs->hint_uentry.clu.size = clu.size; + p_fs->hint_uentry.clu.flags = clu.flags; + } + if ((num_empty >= num_entries) || (entry_type == TYPE_UNUSED)) + p_fs->hint_uentry.entry = dentry - (num_empty-1); + } + + if (entry_type == TYPE_UNUSED) + return -2; + } else { + num_empty = 0; + + if ((entry_type == TYPE_FILE) || (entry_type == TYPE_DIR)) { + file_ep = (FILE_DENTRY_T *) ep; + if ((type == TYPE_ALL) || (type == entry_type)) { + num_ext_entries = file_ep->num_ext; + is_feasible_entry = TRUE; + } else { + is_feasible_entry = FALSE; + step = file_ep->num_ext + 1; + } + } else if (entry_type == TYPE_STREAM) { + if (is_feasible_entry) { + strm_ep = (STRM_DENTRY_T *) ep; + if (p_uniname->name_hash == GET16_A(strm_ep->name_hash) && + p_uniname->name_len == strm_ep->name_len) { + order = 1; + } else { + is_feasible_entry = FALSE; + step = num_ext_entries; + } + } + } else if (entry_type == TYPE_EXTEND) { + if (is_feasible_entry) { + name_ep = (NAME_DENTRY_T *) ep; + + if ((++order) == 2) + uniname = p_uniname->name; + else + uniname += 15; + + len = extract_uni_name_from_name_entry(name_ep, entry_uniname, order); + + unichar = *(uniname+len); + *(uniname+len) = 0x0; + + if (nls_uniname_cmp(sb, uniname, entry_uniname)) { + is_feasible_entry = FALSE; + step = num_ext_entries - order + 1; + } else if (order == num_ext_entries) { + p_fs->hint_uentry.dir = CLUSTER_32(~0); + p_fs->hint_uentry.entry = -1; + return dentry - (num_ext_entries); + } + + *(uniname+len) = unichar; + } + } else { + is_feasible_entry = FALSE; + } + } + + i += step; + dentry += step; + } + + i -= dentries_per_clu; + + if (p_dir->dir == CLUSTER_32(0)) + break; /* FAT16 root_dir */ + + if (clu.flags == 0x03) { + if ((--clu.size) > 0) + clu.dir++; + else + clu.dir = CLUSTER_32(~0); + } else { + if (FAT_read(sb, clu.dir, &(clu.dir)) != 0) + return -2; + } + } + + return -2; +} /* end of exfat_find_dir_entry */ + +/* returns -1 on error */ +s32 fat_count_ext_entries(struct super_block *sb, CHAIN_T *p_dir, s32 entry, DENTRY_T *p_entry) +{ + s32 count = 0; + u8 chksum; + DOS_DENTRY_T *dos_ep = (DOS_DENTRY_T *) p_entry; + EXT_DENTRY_T *ext_ep; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + chksum = calc_checksum_1byte((void *) dos_ep->name, DOS_NAME_LENGTH, 0); + + for (entry--; entry >= 0; entry--) { + ext_ep = (EXT_DENTRY_T *) get_entry_in_dir(sb, p_dir, entry, NULL); + if (!ext_ep) + return -1; + + if ((p_fs->fs_func->get_entry_type((DENTRY_T *) ext_ep) == TYPE_EXTEND) && + (ext_ep->checksum == chksum)) { + count++; + if (ext_ep->order > 0x40) + return count; + } else { + return count; + } + } + + return count; +} /* end of fat_count_ext_entries */ + +/* returns -1 on error */ +s32 exfat_count_ext_entries(struct super_block *sb, CHAIN_T *p_dir, s32 entry, DENTRY_T *p_entry) +{ + int i, count = 0; + u32 type; + FILE_DENTRY_T *file_ep = (FILE_DENTRY_T *) p_entry; + DENTRY_T *ext_ep; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + for (i = 0, entry++; i < file_ep->num_ext; i++, entry++) { + ext_ep = get_entry_in_dir(sb, p_dir, entry, NULL); + if (!ext_ep) + return -1; + + type = p_fs->fs_func->get_entry_type(ext_ep); + if ((type == TYPE_EXTEND) || (type == TYPE_STREAM)) + count++; + else + return count; + } + + return count; +} /* end of exfat_count_ext_entries */ + +/* returns -1 on error */ +s32 count_dos_name_entries(struct super_block *sb, CHAIN_T *p_dir, u32 type) +{ + int i, count = 0; + s32 dentries_per_clu; + u32 entry_type; + CHAIN_T clu; + DENTRY_T *ep; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */ + dentries_per_clu = p_fs->dentries_in_root; + else + dentries_per_clu = p_fs->dentries_per_clu; + + clu.dir = p_dir->dir; + clu.size = p_dir->size; + clu.flags = p_dir->flags; + + while (clu.dir != CLUSTER_32(~0)) { + if (p_fs->dev_ejected) + break; + + for (i = 0; i < dentries_per_clu; i++) { + ep = get_entry_in_dir(sb, &clu, i, NULL); + if (!ep) + return -1; + + entry_type = p_fs->fs_func->get_entry_type(ep); + + if (entry_type == TYPE_UNUSED) + return count; + if (!(type & TYPE_CRITICAL_PRI) && !(type & TYPE_BENIGN_PRI)) + continue; + + if ((type == TYPE_ALL) || (type == entry_type)) + count++; + } + + if (p_dir->dir == CLUSTER_32(0)) + break; /* FAT16 root_dir */ + + if (clu.flags == 0x03) { + if ((--clu.size) > 0) + clu.dir++; + else + clu.dir = CLUSTER_32(~0); + } else { + if (FAT_read(sb, clu.dir, &(clu.dir)) != 0) + return -1; + } + } + + return count; +} /* end of count_dos_name_entries */ + +bool is_dir_empty(struct super_block *sb, CHAIN_T *p_dir) +{ + int i, count = 0; + s32 dentries_per_clu; + u32 type; + CHAIN_T clu; + DENTRY_T *ep; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */ + dentries_per_clu = p_fs->dentries_in_root; + else + dentries_per_clu = p_fs->dentries_per_clu; + + clu.dir = p_dir->dir; + clu.size = p_dir->size; + clu.flags = p_dir->flags; + + while (clu.dir != CLUSTER_32(~0)) { + if (p_fs->dev_ejected) + break; + + for (i = 0; i < dentries_per_clu; i++) { + ep = get_entry_in_dir(sb, &clu, i, NULL); + if (!ep) + break; + + type = p_fs->fs_func->get_entry_type(ep); + + if (type == TYPE_UNUSED) + return TRUE; + if ((type != TYPE_FILE) && (type != TYPE_DIR)) + continue; + + if (p_dir->dir == CLUSTER_32(0)) { /* FAT16 root_dir */ + return FALSE; + } else { + if (p_fs->vol_type == EXFAT) + return FALSE; + if ((p_dir->dir == p_fs->root_dir) || ((++count) > 2)) + return FALSE; + } + } + + if (p_dir->dir == CLUSTER_32(0)) + break; /* FAT16 root_dir */ + + if (clu.flags == 0x03) { + if ((--clu.size) > 0) + clu.dir++; + else + clu.dir = CLUSTER_32(~0); + } else { + if (FAT_read(sb, clu.dir, &(clu.dir)) != 0) + break; + } + } + + return TRUE; +} /* end of is_dir_empty */ + +/* + * Name Conversion Functions + */ + +/* input : dir, uni_name + output : num_of_entry, dos_name(format : aaaaaa~1.bbb) */ +s32 get_num_entries_and_dos_name(struct super_block *sb, CHAIN_T *p_dir, UNI_NAME_T *p_uniname, s32 *entries, DOS_NAME_T *p_dosname) +{ + s32 ret, num_entries, lossy = FALSE; + char **r; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + num_entries = p_fs->fs_func->calc_num_entries(p_uniname); + if (num_entries == 0) + return FFS_INVALIDPATH; + + if (p_fs->vol_type != EXFAT) { + nls_uniname_to_dosname(sb, p_dosname, p_uniname, &lossy); + + if (lossy) { + ret = fat_generate_dos_name(sb, p_dir, p_dosname); + if (ret) + return ret; + } else { + for (r = reserved_names; *r; r++) { + if (!strncmp((void *) p_dosname->name, *r, 8)) + return FFS_INVALIDPATH; + } + + if (p_dosname->name_case != 0xFF) + num_entries = 1; + } + + if (num_entries > 1) + p_dosname->name_case = 0x0; + } + + *entries = num_entries; + + return FFS_SUCCESS; +} /* end of get_num_entries_and_dos_name */ + +void get_uni_name_from_dos_entry(struct super_block *sb, DOS_DENTRY_T *ep, UNI_NAME_T *p_uniname, u8 mode) +{ + DOS_NAME_T dos_name; + + if (mode == 0x0) + dos_name.name_case = 0x0; + else + dos_name.name_case = ep->lcase; + + memcpy(dos_name.name, ep->name, DOS_NAME_LENGTH); + nls_dosname_to_uniname(sb, p_uniname, &dos_name); +} /* end of get_uni_name_from_dos_entry */ + +void fat_get_uni_name_from_ext_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, u16 *uniname) +{ + int i; + EXT_DENTRY_T *ep; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + for (entry--, i = 1; entry >= 0; entry--, i++) { + ep = (EXT_DENTRY_T *) get_entry_in_dir(sb, p_dir, entry, NULL); + if (!ep) + return; + + if (p_fs->fs_func->get_entry_type((DENTRY_T *) ep) == TYPE_EXTEND) { + extract_uni_name_from_ext_entry(ep, uniname, i); + if (ep->order > 0x40) + return; + } else { + return; + } + + uniname += 13; + } +} /* end of fat_get_uni_name_from_ext_entry */ + +void exfat_get_uni_name_from_ext_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, u16 *uniname) +{ + int i; + DENTRY_T *ep; + ENTRY_SET_CACHE_T *es; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + es = get_entry_set_in_dir(sb, p_dir, entry, ES_ALL_ENTRIES, &ep); + if (es == NULL || es->num_entries < 3) { + if (es) + release_entry_set(es); + return; + } + + ep += 2; + + /* + * First entry : file entry + * Second entry : stream-extension entry + * Third entry : first file-name entry + * So, the index of first file-name dentry should start from 2. + */ + for (i = 2; i < es->num_entries; i++, ep++) { + if (p_fs->fs_func->get_entry_type(ep) == TYPE_EXTEND) + extract_uni_name_from_name_entry((NAME_DENTRY_T *)ep, uniname, i); + else + goto out; + uniname += 15; + } + +out: + release_entry_set(es); +} /* end of exfat_get_uni_name_from_ext_entry */ + +s32 extract_uni_name_from_ext_entry(EXT_DENTRY_T *ep, u16 *uniname, s32 order) +{ + int i, len = 0; + + for (i = 0; i < 10; i += 2) { + *uniname = GET16(ep->unicode_0_4+i); + if (*uniname == 0x0) + return len; + uniname++; + len++; + } + + if (order < 20) { + for (i = 0; i < 12; i += 2) { + *uniname = GET16_A(ep->unicode_5_10+i); + if (*uniname == 0x0) + return len; + uniname++; + len++; + } + } else { + for (i = 0; i < 8; i += 2) { + *uniname = GET16_A(ep->unicode_5_10+i); + if (*uniname == 0x0) + return len; + uniname++; + len++; + } + *uniname = 0x0; /* uniname[MAX_NAME_LENGTH-1] */ + return len; + } + + for (i = 0; i < 4; i += 2) { + *uniname = GET16_A(ep->unicode_11_12+i); + if (*uniname == 0x0) + return len; + uniname++; + len++; + } + + *uniname = 0x0; + return len; + +} /* end of extract_uni_name_from_ext_entry */ + +s32 extract_uni_name_from_name_entry(NAME_DENTRY_T *ep, u16 *uniname, s32 order) +{ + int i, len = 0; + + for (i = 0; i < 30; i += 2) { + *uniname = GET16_A(ep->unicode_0_14+i); + if (*uniname == 0x0) + return len; + uniname++; + len++; + } + + *uniname = 0x0; + return len; + +} /* end of extract_uni_name_from_name_entry */ + +s32 fat_generate_dos_name(struct super_block *sb, CHAIN_T *p_dir, DOS_NAME_T *p_dosname) +{ + int i, j, count = 0, count_begin = FALSE; + s32 dentries_per_clu; + u32 type; + u8 bmap[128/* 1 ~ 1023 */]; + CHAIN_T clu; + DOS_DENTRY_T *ep; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + memset(bmap, 0, sizeof bmap); + exfat_bitmap_set(bmap, 0); + + if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */ + dentries_per_clu = p_fs->dentries_in_root; + else + dentries_per_clu = p_fs->dentries_per_clu; + + clu.dir = p_dir->dir; + clu.flags = p_dir->flags; + + while (clu.dir != CLUSTER_32(~0)) { + if (p_fs->dev_ejected) + break; + + for (i = 0; i < dentries_per_clu; i++) { + ep = (DOS_DENTRY_T *) get_entry_in_dir(sb, &clu, i, NULL); + if (!ep) + return FFS_MEDIAERR; + + type = p_fs->fs_func->get_entry_type((DENTRY_T *) ep); + + if (type == TYPE_UNUSED) + break; + if ((type != TYPE_FILE) && (type != TYPE_DIR)) + continue; + + count = 0; + count_begin = FALSE; + + for (j = 0; j < 8; j++) { + if (ep->name[j] == ' ') + break; + + if (ep->name[j] == '~') { + count_begin = TRUE; + } else if (count_begin) { + if ((ep->name[j] >= '0') && (ep->name[j] <= '9')) { + count = count * 10 + (ep->name[j] - '0'); + } else { + count = 0; + count_begin = FALSE; + } + } + } + + if ((count > 0) && (count < 1024)) + exfat_bitmap_set(bmap, count); + } + + if (p_dir->dir == CLUSTER_32(0)) + break; /* FAT16 root_dir */ + + if (FAT_read(sb, clu.dir, &(clu.dir)) != 0) + return FFS_MEDIAERR; + } + + count = 0; + for (i = 0; i < 128; i++) { + if (bmap[i] != 0xFF) { + for (j = 0; j < 8; j++) { + if (exfat_bitmap_test(&(bmap[i]), j) == 0) { + count = (i << 3) + j; + break; + } + } + if (count != 0) + break; + } + } + + if ((count == 0) || (count >= 1024)) + return FFS_FILEEXIST; + else + fat_attach_count_to_dos_name(p_dosname->name, count); + + /* Now dos_name has DOS~????.EXT */ + return FFS_SUCCESS; +} /* end of generate_dos_name */ + +void fat_attach_count_to_dos_name(u8 *dosname, s32 count) +{ + int i, j, length; + char str_count[6]; + + snprintf(str_count, sizeof str_count, "~%d", count); + length = strlen(str_count); + + i = j = 0; + while (j <= (8 - length)) { + i = j; + if (dosname[j] == ' ') + break; + if (dosname[j] & 0x80) + j += 2; + else + j++; + } + + for (j = 0; j < length; i++, j++) + dosname[i] = (u8) str_count[j]; + + if (i == 7) + dosname[7] = ' '; + +} /* end of attach_count_to_dos_name */ + +s32 fat_calc_num_entries(UNI_NAME_T *p_uniname) +{ + s32 len; + + len = p_uniname->name_len; + if (len == 0) + return 0; + + /* 1 dos name entry + extended entries */ + return (len-1) / 13 + 2; + +} /* end of calc_num_enties */ + +s32 exfat_calc_num_entries(UNI_NAME_T *p_uniname) +{ + s32 len; + + len = p_uniname->name_len; + if (len == 0) + return 0; + + /* 1 file entry + 1 stream entry + name entries */ + return (len-1) / 15 + 3; + +} /* end of exfat_calc_num_enties */ + +u8 calc_checksum_1byte(void *data, s32 len, u8 chksum) +{ + int i; + u8 *c = (u8 *) data; + + for (i = 0; i < len; i++, c++) + chksum = (((chksum & 1) << 7) | ((chksum & 0xFE) >> 1)) + *c; + + return chksum; +} /* end of calc_checksum_1byte */ + +u16 calc_checksum_2byte(void *data, s32 len, u16 chksum, s32 type) +{ + int i; + u8 *c = (u8 *) data; + + switch (type) { + case CS_DIR_ENTRY: + for (i = 0; i < len; i++, c++) { + if ((i == 2) || (i == 3)) + continue; + chksum = (((chksum & 1) << 15) | ((chksum & 0xFFFE) >> 1)) + (u16) *c; + } + break; + default + : + for (i = 0; i < len; i++, c++) + chksum = (((chksum & 1) << 15) | ((chksum & 0xFFFE) >> 1)) + (u16) *c; + } + + return chksum; +} /* end of calc_checksum_2byte */ + +u32 calc_checksum_4byte(void *data, s32 len, u32 chksum, s32 type) +{ + int i; + u8 *c = (u8 *) data; + + switch (type) { + case CS_PBR_SECTOR: + for (i = 0; i < len; i++, c++) { + if ((i == 106) || (i == 107) || (i == 112)) + continue; + chksum = (((chksum & 1) << 31) | ((chksum & 0xFFFFFFFE) >> 1)) + (u32) *c; + } + break; + default + : + for (i = 0; i < len; i++, c++) + chksum = (((chksum & 1) << 31) | ((chksum & 0xFFFFFFFE) >> 1)) + (u32) *c; + } + + return chksum; +} /* end of calc_checksum_4byte */ + +/* + * Name Resolution Functions + */ + +/* return values of resolve_path() + > 0 : return the length of the path + < 0 : return error */ +s32 resolve_path(struct inode *inode, char *path, CHAIN_T *p_dir, UNI_NAME_T *p_uniname) +{ + s32 lossy = FALSE; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + FILE_ID_T *fid = &(EXFAT_I(inode)->fid); + + if (strlen(path) >= (MAX_NAME_LENGTH * MAX_CHARSET_SIZE)) + return FFS_INVALIDPATH; + + strcpy(name_buf, path); + + nls_cstring_to_uniname(sb, p_uniname, name_buf, &lossy); + if (lossy) + return FFS_INVALIDPATH; + + fid->size = i_size_read(inode); + + p_dir->dir = fid->start_clu; + p_dir->size = (s32)(fid->size >> p_fs->cluster_size_bits); + p_dir->flags = fid->flags; + + return FFS_SUCCESS; +} + +/* + * File Operation Functions + */ +static FS_FUNC_T fat_fs_func = { + .alloc_cluster = fat_alloc_cluster, + .free_cluster = fat_free_cluster, + .count_used_clusters = fat_count_used_clusters, + + .init_dir_entry = fat_init_dir_entry, + .init_ext_entry = fat_init_ext_entry, + .find_dir_entry = fat_find_dir_entry, + .delete_dir_entry = fat_delete_dir_entry, + .get_uni_name_from_ext_entry = fat_get_uni_name_from_ext_entry, + .count_ext_entries = fat_count_ext_entries, + .calc_num_entries = fat_calc_num_entries, + + .get_entry_type = fat_get_entry_type, + .set_entry_type = fat_set_entry_type, + .get_entry_attr = fat_get_entry_attr, + .set_entry_attr = fat_set_entry_attr, + .get_entry_flag = fat_get_entry_flag, + .set_entry_flag = fat_set_entry_flag, + .get_entry_clu0 = fat_get_entry_clu0, + .set_entry_clu0 = fat_set_entry_clu0, + .get_entry_size = fat_get_entry_size, + .set_entry_size = fat_set_entry_size, + .get_entry_time = fat_get_entry_time, + .set_entry_time = fat_set_entry_time, +}; + + +s32 fat16_mount(struct super_block *sb, PBR_SECTOR_T *p_pbr) +{ + s32 num_reserved, num_root_sectors; + BPB16_T *p_bpb = (BPB16_T *) p_pbr->bpb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + + if (p_bpb->num_fats == 0) + return FFS_FORMATERR; + + num_root_sectors = GET16(p_bpb->num_root_entries) << DENTRY_SIZE_BITS; + num_root_sectors = ((num_root_sectors-1) >> p_bd->sector_size_bits) + 1; + + p_fs->sectors_per_clu = p_bpb->sectors_per_clu; + p_fs->sectors_per_clu_bits = ilog2(p_bpb->sectors_per_clu); + p_fs->cluster_size_bits = p_fs->sectors_per_clu_bits + p_bd->sector_size_bits; + p_fs->cluster_size = 1 << p_fs->cluster_size_bits; + + p_fs->num_FAT_sectors = GET16(p_bpb->num_fat_sectors); + + p_fs->FAT1_start_sector = p_fs->PBR_sector + GET16(p_bpb->num_reserved); + if (p_bpb->num_fats == 1) + p_fs->FAT2_start_sector = p_fs->FAT1_start_sector; + else + p_fs->FAT2_start_sector = p_fs->FAT1_start_sector + p_fs->num_FAT_sectors; + + p_fs->root_start_sector = p_fs->FAT2_start_sector + p_fs->num_FAT_sectors; + p_fs->data_start_sector = p_fs->root_start_sector + num_root_sectors; + + p_fs->num_sectors = GET16(p_bpb->num_sectors); + if (p_fs->num_sectors == 0) + p_fs->num_sectors = GET32(p_bpb->num_huge_sectors); + + num_reserved = p_fs->data_start_sector - p_fs->PBR_sector; + p_fs->num_clusters = ((p_fs->num_sectors - num_reserved) >> p_fs->sectors_per_clu_bits) + 2; + /* because the cluster index starts with 2 */ + + if (p_fs->num_clusters < FAT12_THRESHOLD) + p_fs->vol_type = FAT12; + else + p_fs->vol_type = FAT16; + p_fs->vol_id = GET32(p_bpb->vol_serial); + + p_fs->root_dir = 0; + p_fs->dentries_in_root = GET16(p_bpb->num_root_entries); + p_fs->dentries_per_clu = 1 << (p_fs->cluster_size_bits - DENTRY_SIZE_BITS); + + p_fs->vol_flag = VOL_CLEAN; + p_fs->clu_srch_ptr = 2; + p_fs->used_clusters = (u32) ~0; + + p_fs->fs_func = &fat_fs_func; + + return FFS_SUCCESS; +} /* end of fat16_mount */ + +s32 fat32_mount(struct super_block *sb, PBR_SECTOR_T *p_pbr) +{ + s32 num_reserved; + BPB32_T *p_bpb = (BPB32_T *) p_pbr->bpb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + + if (p_bpb->num_fats == 0) + return FFS_FORMATERR; + + p_fs->sectors_per_clu = p_bpb->sectors_per_clu; + p_fs->sectors_per_clu_bits = ilog2(p_bpb->sectors_per_clu); + p_fs->cluster_size_bits = p_fs->sectors_per_clu_bits + p_bd->sector_size_bits; + p_fs->cluster_size = 1 << p_fs->cluster_size_bits; + + p_fs->num_FAT_sectors = GET32(p_bpb->num_fat32_sectors); + + p_fs->FAT1_start_sector = p_fs->PBR_sector + GET16(p_bpb->num_reserved); + if (p_bpb->num_fats == 1) + p_fs->FAT2_start_sector = p_fs->FAT1_start_sector; + else + p_fs->FAT2_start_sector = p_fs->FAT1_start_sector + p_fs->num_FAT_sectors; + + p_fs->root_start_sector = p_fs->FAT2_start_sector + p_fs->num_FAT_sectors; + p_fs->data_start_sector = p_fs->root_start_sector; + + p_fs->num_sectors = GET32(p_bpb->num_huge_sectors); + num_reserved = p_fs->data_start_sector - p_fs->PBR_sector; + + p_fs->num_clusters = ((p_fs->num_sectors-num_reserved) >> p_fs->sectors_per_clu_bits) + 2; + /* because the cluster index starts with 2 */ + + p_fs->vol_type = FAT32; + p_fs->vol_id = GET32(p_bpb->vol_serial); + + p_fs->root_dir = GET32(p_bpb->root_cluster); + p_fs->dentries_in_root = 0; + p_fs->dentries_per_clu = 1 << (p_fs->cluster_size_bits - DENTRY_SIZE_BITS); + + p_fs->vol_flag = VOL_CLEAN; + p_fs->clu_srch_ptr = 2; + p_fs->used_clusters = (u32) ~0; + + p_fs->fs_func = &fat_fs_func; + + return FFS_SUCCESS; +} /* end of fat32_mount */ + +static FS_FUNC_T exfat_fs_func = { + .alloc_cluster = exfat_alloc_cluster, + .free_cluster = exfat_free_cluster, + .count_used_clusters = exfat_count_used_clusters, + + .init_dir_entry = exfat_init_dir_entry, + .init_ext_entry = exfat_init_ext_entry, + .find_dir_entry = exfat_find_dir_entry, + .delete_dir_entry = exfat_delete_dir_entry, + .get_uni_name_from_ext_entry = exfat_get_uni_name_from_ext_entry, + .count_ext_entries = exfat_count_ext_entries, + .calc_num_entries = exfat_calc_num_entries, + + .get_entry_type = exfat_get_entry_type, + .set_entry_type = exfat_set_entry_type, + .get_entry_attr = exfat_get_entry_attr, + .set_entry_attr = exfat_set_entry_attr, + .get_entry_flag = exfat_get_entry_flag, + .set_entry_flag = exfat_set_entry_flag, + .get_entry_clu0 = exfat_get_entry_clu0, + .set_entry_clu0 = exfat_set_entry_clu0, + .get_entry_size = exfat_get_entry_size, + .set_entry_size = exfat_set_entry_size, + .get_entry_time = exfat_get_entry_time, + .set_entry_time = exfat_set_entry_time, +}; + +s32 exfat_mount(struct super_block *sb, PBR_SECTOR_T *p_pbr) +{ + BPBEX_T *p_bpb = (BPBEX_T *) p_pbr->bpb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + + if (p_bpb->num_fats == 0) + return FFS_FORMATERR; + + p_fs->sectors_per_clu = 1 << p_bpb->sectors_per_clu_bits; + p_fs->sectors_per_clu_bits = p_bpb->sectors_per_clu_bits; + p_fs->cluster_size_bits = p_fs->sectors_per_clu_bits + p_bd->sector_size_bits; + p_fs->cluster_size = 1 << p_fs->cluster_size_bits; + + p_fs->num_FAT_sectors = GET32(p_bpb->fat_length); + + p_fs->FAT1_start_sector = p_fs->PBR_sector + GET32(p_bpb->fat_offset); + if (p_bpb->num_fats == 1) + p_fs->FAT2_start_sector = p_fs->FAT1_start_sector; + else + p_fs->FAT2_start_sector = p_fs->FAT1_start_sector + p_fs->num_FAT_sectors; + + p_fs->root_start_sector = p_fs->PBR_sector + GET32(p_bpb->clu_offset); + p_fs->data_start_sector = p_fs->root_start_sector; + + p_fs->num_sectors = GET64(p_bpb->vol_length); + p_fs->num_clusters = GET32(p_bpb->clu_count) + 2; + /* because the cluster index starts with 2 */ + + p_fs->vol_type = EXFAT; + p_fs->vol_id = GET32(p_bpb->vol_serial); + + p_fs->root_dir = GET32(p_bpb->root_cluster); + p_fs->dentries_in_root = 0; + p_fs->dentries_per_clu = 1 << (p_fs->cluster_size_bits - DENTRY_SIZE_BITS); + + p_fs->vol_flag = (u32) GET16(p_bpb->vol_flags); + p_fs->clu_srch_ptr = 2; + p_fs->used_clusters = (u32) ~0; + + p_fs->fs_func = &exfat_fs_func; + + return FFS_SUCCESS; +} /* end of exfat_mount */ + +s32 create_dir(struct inode *inode, CHAIN_T *p_dir, UNI_NAME_T *p_uniname, FILE_ID_T *fid) +{ + s32 ret, dentry, num_entries; + u64 size; + CHAIN_T clu; + DOS_NAME_T dos_name, dot_name; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + ret = get_num_entries_and_dos_name(sb, p_dir, p_uniname, &num_entries, &dos_name); + if (ret) + return ret; + + /* find_empty_entry must be called before alloc_cluster */ + dentry = find_empty_entry(inode, p_dir, num_entries); + if (dentry < 0) + return FFS_FULL; + + clu.dir = CLUSTER_32(~0); + clu.size = 0; + clu.flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01; + + /* (1) allocate a cluster */ + ret = p_fs->fs_func->alloc_cluster(sb, 1, &clu); + if (ret < 0) + return FFS_MEDIAERR; + else if (ret == 0) + return FFS_FULL; + + ret = clear_cluster(sb, clu.dir); + if (ret != FFS_SUCCESS) + return ret; + + if (p_fs->vol_type == EXFAT) { + size = p_fs->cluster_size; + } else { + size = 0; + + /* initialize the . and .. entry + Information for . points to itself + Information for .. points to parent dir */ + + dot_name.name_case = 0x0; + memcpy(dot_name.name, DOS_CUR_DIR_NAME, DOS_NAME_LENGTH); + + ret = p_fs->fs_func->init_dir_entry(sb, &clu, 0, TYPE_DIR, clu.dir, 0); + if (ret != FFS_SUCCESS) + return ret; + + ret = p_fs->fs_func->init_ext_entry(sb, &clu, 0, 1, NULL, &dot_name); + if (ret != FFS_SUCCESS) + return ret; + + memcpy(dot_name.name, DOS_PAR_DIR_NAME, DOS_NAME_LENGTH); + + if (p_dir->dir == p_fs->root_dir) + ret = p_fs->fs_func->init_dir_entry(sb, &clu, 1, TYPE_DIR, CLUSTER_32(0), 0); + else + ret = p_fs->fs_func->init_dir_entry(sb, &clu, 1, TYPE_DIR, p_dir->dir, 0); + + if (ret != FFS_SUCCESS) + return ret; + + ret = p_fs->fs_func->init_ext_entry(sb, &clu, 1, 1, NULL, &dot_name); + if (ret != FFS_SUCCESS) + return ret; + } + + /* (2) update the directory entry */ + /* make sub-dir entry in parent directory */ + ret = p_fs->fs_func->init_dir_entry(sb, p_dir, dentry, TYPE_DIR, clu.dir, size); + if (ret != FFS_SUCCESS) + return ret; + + ret = p_fs->fs_func->init_ext_entry(sb, p_dir, dentry, num_entries, p_uniname, &dos_name); + if (ret != FFS_SUCCESS) + return ret; + + fid->dir.dir = p_dir->dir; + fid->dir.size = p_dir->size; + fid->dir.flags = p_dir->flags; + fid->entry = dentry; + + fid->attr = ATTR_SUBDIR; + fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01; + fid->size = size; + fid->start_clu = clu.dir; + + fid->type = TYPE_DIR; + fid->rwoffset = 0; + fid->hint_last_off = -1; + + return FFS_SUCCESS; +} /* end of create_dir */ + +s32 create_file(struct inode *inode, CHAIN_T *p_dir, UNI_NAME_T *p_uniname, u8 mode, FILE_ID_T *fid) +{ + s32 ret, dentry, num_entries; + DOS_NAME_T dos_name; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + ret = get_num_entries_and_dos_name(sb, p_dir, p_uniname, &num_entries, &dos_name); + if (ret) + return ret; + + /* find_empty_entry must be called before alloc_cluster() */ + dentry = find_empty_entry(inode, p_dir, num_entries); + if (dentry < 0) + return FFS_FULL; + + /* (1) update the directory entry */ + /* fill the dos name directory entry information of the created file. + the first cluster is not determined yet. (0) */ + ret = p_fs->fs_func->init_dir_entry(sb, p_dir, dentry, TYPE_FILE | mode, CLUSTER_32(0), 0); + if (ret != FFS_SUCCESS) + return ret; + + ret = p_fs->fs_func->init_ext_entry(sb, p_dir, dentry, num_entries, p_uniname, &dos_name); + if (ret != FFS_SUCCESS) + return ret; + + fid->dir.dir = p_dir->dir; + fid->dir.size = p_dir->size; + fid->dir.flags = p_dir->flags; + fid->entry = dentry; + + fid->attr = ATTR_ARCHIVE | mode; + fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01; + fid->size = 0; + fid->start_clu = CLUSTER_32(~0); + + fid->type = TYPE_FILE; + fid->rwoffset = 0; + fid->hint_last_off = -1; + + return FFS_SUCCESS; +} /* end of create_file */ + +void remove_file(struct inode *inode, CHAIN_T *p_dir, s32 entry) +{ + s32 num_entries; + sector_t sector; + DENTRY_T *ep; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + ep = get_entry_in_dir(sb, p_dir, entry, §or); + if (!ep) + return; + + buf_lock(sb, sector); + + /* buf_lock() before call count_ext_entries() */ + num_entries = p_fs->fs_func->count_ext_entries(sb, p_dir, entry, ep); + if (num_entries < 0) { + buf_unlock(sb, sector); + return; + } + num_entries++; + + buf_unlock(sb, sector); + + /* (1) update the directory entry */ + p_fs->fs_func->delete_dir_entry(sb, p_dir, entry, 0, num_entries); +} /* end of remove_file */ + +s32 rename_file(struct inode *inode, CHAIN_T *p_dir, s32 oldentry, UNI_NAME_T *p_uniname, FILE_ID_T *fid) +{ + s32 ret, newentry = -1, num_old_entries, num_new_entries; + sector_t sector_old, sector_new; + DOS_NAME_T dos_name; + DENTRY_T *epold, *epnew; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + epold = get_entry_in_dir(sb, p_dir, oldentry, §or_old); + if (!epold) + return FFS_MEDIAERR; + + buf_lock(sb, sector_old); + + /* buf_lock() before call count_ext_entries() */ + num_old_entries = p_fs->fs_func->count_ext_entries(sb, p_dir, oldentry, epold); + if (num_old_entries < 0) { + buf_unlock(sb, sector_old); + return FFS_MEDIAERR; + } + num_old_entries++; + + ret = get_num_entries_and_dos_name(sb, p_dir, p_uniname, &num_new_entries, &dos_name); + if (ret) { + buf_unlock(sb, sector_old); + return ret; + } + + if (num_old_entries < num_new_entries) { + newentry = find_empty_entry(inode, p_dir, num_new_entries); + if (newentry < 0) { + buf_unlock(sb, sector_old); + return FFS_FULL; + } + + epnew = get_entry_in_dir(sb, p_dir, newentry, §or_new); + if (!epnew) { + buf_unlock(sb, sector_old); + return FFS_MEDIAERR; + } + + memcpy((void *) epnew, (void *) epold, DENTRY_SIZE); + if (p_fs->fs_func->get_entry_type(epnew) == TYPE_FILE) { + p_fs->fs_func->set_entry_attr(epnew, p_fs->fs_func->get_entry_attr(epnew) | ATTR_ARCHIVE); + fid->attr |= ATTR_ARCHIVE; + } + buf_modify(sb, sector_new); + buf_unlock(sb, sector_old); + + if (p_fs->vol_type == EXFAT) { + epold = get_entry_in_dir(sb, p_dir, oldentry+1, §or_old); + buf_lock(sb, sector_old); + epnew = get_entry_in_dir(sb, p_dir, newentry+1, §or_new); + + if (!epold || !epnew) { + buf_unlock(sb, sector_old); + return FFS_MEDIAERR; + } + + memcpy((void *) epnew, (void *) epold, DENTRY_SIZE); + buf_modify(sb, sector_new); + buf_unlock(sb, sector_old); + } + + ret = p_fs->fs_func->init_ext_entry(sb, p_dir, newentry, num_new_entries, p_uniname, &dos_name); + if (ret != FFS_SUCCESS) + return ret; + + p_fs->fs_func->delete_dir_entry(sb, p_dir, oldentry, 0, num_old_entries); + fid->entry = newentry; + } else { + if (p_fs->fs_func->get_entry_type(epold) == TYPE_FILE) { + p_fs->fs_func->set_entry_attr(epold, p_fs->fs_func->get_entry_attr(epold) | ATTR_ARCHIVE); + fid->attr |= ATTR_ARCHIVE; + } + buf_modify(sb, sector_old); + buf_unlock(sb, sector_old); + + ret = p_fs->fs_func->init_ext_entry(sb, p_dir, oldentry, num_new_entries, p_uniname, &dos_name); + if (ret != FFS_SUCCESS) + return ret; + + p_fs->fs_func->delete_dir_entry(sb, p_dir, oldentry, num_new_entries, num_old_entries); + } + + return FFS_SUCCESS; +} /* end of rename_file */ + +s32 move_file(struct inode *inode, CHAIN_T *p_olddir, s32 oldentry, CHAIN_T *p_newdir, UNI_NAME_T *p_uniname, FILE_ID_T *fid) +{ + s32 ret, newentry, num_new_entries, num_old_entries; + sector_t sector_mov, sector_new; + CHAIN_T clu; + DOS_NAME_T dos_name; + DENTRY_T *epmov, *epnew; + struct super_block *sb = inode->i_sb; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + epmov = get_entry_in_dir(sb, p_olddir, oldentry, §or_mov); + if (!epmov) + return FFS_MEDIAERR; + + /* check if the source and target directory is the same */ + if (p_fs->fs_func->get_entry_type(epmov) == TYPE_DIR && + p_fs->fs_func->get_entry_clu0(epmov) == p_newdir->dir) + return FFS_INVALIDPATH; + + buf_lock(sb, sector_mov); + + /* buf_lock() before call count_ext_entries() */ + num_old_entries = p_fs->fs_func->count_ext_entries(sb, p_olddir, oldentry, epmov); + if (num_old_entries < 0) { + buf_unlock(sb, sector_mov); + return FFS_MEDIAERR; + } + num_old_entries++; + + ret = get_num_entries_and_dos_name(sb, p_newdir, p_uniname, &num_new_entries, &dos_name); + if (ret) { + buf_unlock(sb, sector_mov); + return ret; + } + + newentry = find_empty_entry(inode, p_newdir, num_new_entries); + if (newentry < 0) { + buf_unlock(sb, sector_mov); + return FFS_FULL; + } + + epnew = get_entry_in_dir(sb, p_newdir, newentry, §or_new); + if (!epnew) { + buf_unlock(sb, sector_mov); + return FFS_MEDIAERR; + } + + memcpy((void *) epnew, (void *) epmov, DENTRY_SIZE); + if (p_fs->fs_func->get_entry_type(epnew) == TYPE_FILE) { + p_fs->fs_func->set_entry_attr(epnew, p_fs->fs_func->get_entry_attr(epnew) | ATTR_ARCHIVE); + fid->attr |= ATTR_ARCHIVE; + } + buf_modify(sb, sector_new); + buf_unlock(sb, sector_mov); + + if (p_fs->vol_type == EXFAT) { + epmov = get_entry_in_dir(sb, p_olddir, oldentry+1, §or_mov); + buf_lock(sb, sector_mov); + epnew = get_entry_in_dir(sb, p_newdir, newentry+1, §or_new); + if (!epmov || !epnew) { + buf_unlock(sb, sector_mov); + return FFS_MEDIAERR; + } + + memcpy((void *) epnew, (void *) epmov, DENTRY_SIZE); + buf_modify(sb, sector_new); + buf_unlock(sb, sector_mov); + } else if (p_fs->fs_func->get_entry_type(epnew) == TYPE_DIR) { + /* change ".." pointer to new parent dir */ + clu.dir = p_fs->fs_func->get_entry_clu0(epnew); + clu.flags = 0x01; + + epnew = get_entry_in_dir(sb, &clu, 1, §or_new); + if (!epnew) + return FFS_MEDIAERR; + + if (p_newdir->dir == p_fs->root_dir) + p_fs->fs_func->set_entry_clu0(epnew, CLUSTER_32(0)); + else + p_fs->fs_func->set_entry_clu0(epnew, p_newdir->dir); + buf_modify(sb, sector_new); + } + + ret = p_fs->fs_func->init_ext_entry(sb, p_newdir, newentry, num_new_entries, p_uniname, &dos_name); + if (ret != FFS_SUCCESS) + return ret; + + p_fs->fs_func->delete_dir_entry(sb, p_olddir, oldentry, 0, num_old_entries); + + fid->dir.dir = p_newdir->dir; + fid->dir.size = p_newdir->size; + fid->dir.flags = p_newdir->flags; + + fid->entry = newentry; + + return FFS_SUCCESS; +} /* end of move_file */ + +/* + * Sector Read/Write Functions + */ + +s32 sector_read(struct super_block *sb, sector_t sec, struct buffer_head **bh, s32 read) +{ + s32 ret = FFS_MEDIAERR; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + if ((sec >= (p_fs->PBR_sector+p_fs->num_sectors)) && (p_fs->num_sectors > 0)) { + printk("[EXFAT] sector_read: out of range error! (sec = %llu)\n", (unsigned long long)sec); + fs_error(sb); + return ret; + } + + if (!p_fs->dev_ejected) { + ret = bdev_read(sb, sec, bh, 1, read); + if (ret != FFS_SUCCESS) + p_fs->dev_ejected = TRUE; + } + + return ret; +} /* end of sector_read */ + +s32 sector_write(struct super_block *sb, sector_t sec, struct buffer_head *bh, s32 sync) +{ + s32 ret = FFS_MEDIAERR; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + if (sec >= (p_fs->PBR_sector+p_fs->num_sectors) && (p_fs->num_sectors > 0)) { + printk("[EXFAT] sector_write: out of range error! (sec = %llu)\n", (unsigned long long)sec); + fs_error(sb); + return ret; + } + + if (bh == NULL) { + printk("[EXFAT] sector_write: bh is NULL!\n"); + fs_error(sb); + return ret; + } + + if (!p_fs->dev_ejected) { + ret = bdev_write(sb, sec, bh, 1, sync); + if (ret != FFS_SUCCESS) + p_fs->dev_ejected = TRUE; + } + + return ret; +} /* end of sector_write */ + +s32 multi_sector_read(struct super_block *sb, sector_t sec, struct buffer_head **bh, s32 num_secs, s32 read) +{ + s32 ret = FFS_MEDIAERR; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + if (((sec+num_secs) > (p_fs->PBR_sector+p_fs->num_sectors)) && (p_fs->num_sectors > 0)) { + printk("[EXFAT] multi_sector_read: out of range error! (sec = %llu, num_secs = %d)\n", + (unsigned long long)sec, num_secs); + fs_error(sb); + return ret; + } + + if (!p_fs->dev_ejected) { + ret = bdev_read(sb, sec, bh, num_secs, read); + if (ret != FFS_SUCCESS) + p_fs->dev_ejected = TRUE; + } + + return ret; +} /* end of multi_sector_read */ + +s32 multi_sector_write(struct super_block *sb, sector_t sec, struct buffer_head *bh, s32 num_secs, s32 sync) +{ + s32 ret = FFS_MEDIAERR; + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + if ((sec+num_secs) > (p_fs->PBR_sector+p_fs->num_sectors) && (p_fs->num_sectors > 0)) { + printk("[EXFAT] multi_sector_write: out of range error! (sec = %llu, num_secs = %d)\n", + (unsigned long long)sec, num_secs); + fs_error(sb); + return ret; + } + if (bh == NULL) { + printk("[EXFAT] multi_sector_write: bh is NULL!\n"); + fs_error(sb); + return ret; + } + + if (!p_fs->dev_ejected) { + ret = bdev_write(sb, sec, bh, num_secs, sync); + if (ret != FFS_SUCCESS) + p_fs->dev_ejected = TRUE; + } + + return ret; +} /* end of multi_sector_write */ diff --git a/fs/exfat/exfat_core.h b/fs/exfat/exfat_core.h new file mode 100644 index 0000000000000000..52d05c7007d32d34 --- /dev/null +++ b/fs/exfat/exfat_core.h @@ -0,0 +1,671 @@ +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +/************************************************************************/ +/* */ +/* PROJECT : exFAT & FAT12/16/32 File System */ +/* FILE : exfat_core.h */ +/* PURPOSE : Header File for exFAT File Manager */ +/* */ +/*----------------------------------------------------------------------*/ +/* NOTES */ +/* */ +/*----------------------------------------------------------------------*/ +/* REVISION HISTORY (Ver 0.9) */ +/* */ +/* - 2010.11.15 [Joosun Hahn] : first writing */ +/* */ +/************************************************************************/ + +#ifndef _EXFAT_H +#define _EXFAT_H + +#include "exfat_config.h" +#include "exfat_data.h" +#include "exfat_oal.h" + +#include "exfat_blkdev.h" +#include "exfat_cache.h" +#include "exfat_nls.h" +#include "exfat_api.h" +#include "exfat_cache.h" + +#ifdef CONFIG_EXFAT_KERNEL_DEBUG + /* For Debugging Purpose */ + /* IOCTL code 'f' used by + * - file systems typically #0~0x1F + * - embedded terminal devices #128~ + * - exts for debugging purpose #99 + * number 100 and 101 is availble now but has possible conflicts + */ +#define EXFAT_IOC_GET_DEBUGFLAGS _IOR('f', 100, long) +#define EXFAT_IOC_SET_DEBUGFLAGS _IOW('f', 101, long) + +#define EXFAT_DEBUGFLAGS_INVALID_UMOUNT 0x01 +#define EXFAT_DEBUGFLAGS_ERROR_RW 0x02 +#endif /* CONFIG_EXFAT_KERNEL_DEBUG */ + + /*----------------------------------------------------------------------*/ + /* Constant & Macro Definitions */ + /*----------------------------------------------------------------------*/ + +#define DENTRY_SIZE 32 /* dir entry size */ +#define DENTRY_SIZE_BITS 5 + +/* PBR entries */ +#define PBR_SIGNATURE 0xAA55 +#define EXT_SIGNATURE 0xAA550000 +#define VOL_LABEL "NO NAME " /* size should be 11 */ +#define OEM_NAME "MSWIN4.1" /* size should be 8 */ +#define STR_FAT12 "FAT12 " /* size should be 8 */ +#define STR_FAT16 "FAT16 " /* size should be 8 */ +#define STR_FAT32 "FAT32 " /* size should be 8 */ +#define STR_EXFAT "EXFAT " /* size should be 8 */ +#define VOL_CLEAN 0x0000 +#define VOL_DIRTY 0x0002 + +/* max number of clusters */ +#define FAT12_THRESHOLD 4087 /* 2^12 - 1 + 2 (clu 0 & 1) */ +#define FAT16_THRESHOLD 65527 /* 2^16 - 1 + 2 */ +#define FAT32_THRESHOLD 268435457 /* 2^28 - 1 + 2 */ +#define EXFAT_THRESHOLD 268435457 /* 2^28 - 1 + 2 */ + +/* file types */ +#define TYPE_UNUSED 0x0000 +#define TYPE_DELETED 0x0001 +#define TYPE_INVALID 0x0002 +#define TYPE_CRITICAL_PRI 0x0100 +#define TYPE_BITMAP 0x0101 +#define TYPE_UPCASE 0x0102 +#define TYPE_VOLUME 0x0103 +#define TYPE_DIR 0x0104 +#define TYPE_FILE 0x011F +#define TYPE_SYMLINK 0x015F +#define TYPE_CRITICAL_SEC 0x0200 +#define TYPE_STREAM 0x0201 +#define TYPE_EXTEND 0x0202 +#define TYPE_ACL 0x0203 +#define TYPE_BENIGN_PRI 0x0400 +#define TYPE_GUID 0x0401 +#define TYPE_PADDING 0x0402 +#define TYPE_ACLTAB 0x0403 +#define TYPE_BENIGN_SEC 0x0800 +#define TYPE_ALL 0x0FFF + +/* time modes */ +#define TM_CREATE 0 +#define TM_MODIFY 1 +#define TM_ACCESS 2 + +/* checksum types */ +#define CS_DIR_ENTRY 0 +#define CS_PBR_SECTOR 1 +#define CS_DEFAULT 2 + +#define CLUSTER_16(x) ((u16)(x)) +#define CLUSTER_32(x) ((u32)(x)) + +#define FALSE 0 +#define TRUE 1 + +#define MIN(a, b) (((a) < (b)) ? (a) : (b)) +#define MAX(a, b) (((a) > (b)) ? (a) : (b)) + +#define START_SECTOR(x) \ + ((((sector_t)((x) - 2)) << p_fs->sectors_per_clu_bits) + p_fs->data_start_sector) + +#define IS_LAST_SECTOR_IN_CLUSTER(sec) \ + ((((sec) - p_fs->data_start_sector + 1) & ((1 << p_fs->sectors_per_clu_bits) - 1)) == 0) + +#define GET_CLUSTER_FROM_SECTOR(sec) \ + ((u32)((((sec) - p_fs->data_start_sector) >> p_fs->sectors_per_clu_bits) + 2)) + +#define GET16(p_src) \ + (((u16)(p_src)[0]) | (((u16)(p_src)[1]) << 8)) +#define GET32(p_src) \ + (((u32)(p_src)[0]) | (((u32)(p_src)[1]) << 8) | \ + (((u32)(p_src)[2]) << 16) | (((u32)(p_src)[3]) << 24)) +#define GET64(p_src) \ + (((u64)(p_src)[0]) | (((u64)(p_src)[1]) << 8) | \ + (((u64)(p_src)[2]) << 16) | (((u64)(p_src)[3]) << 24) | \ + (((u64)(p_src)[4]) << 32) | (((u64)(p_src)[5]) << 40) | \ + (((u64)(p_src)[6]) << 48) | (((u64)(p_src)[7]) << 56)) + + +#define SET16(p_dst, src) \ + do { \ + (p_dst)[0] = (u8)(src); \ + (p_dst)[1] = (u8)(((u16)(src)) >> 8); \ + } while (0) +#define SET32(p_dst, src) \ + do { \ + (p_dst)[0] = (u8)(src); \ + (p_dst)[1] = (u8)(((u32)(src)) >> 8); \ + (p_dst)[2] = (u8)(((u32)(src)) >> 16); \ + (p_dst)[3] = (u8)(((u32)(src)) >> 24); \ + } while (0) +#define SET64(p_dst, src) \ + do { \ + (p_dst)[0] = (u8)(src); \ + (p_dst)[1] = (u8)(((u64)(src)) >> 8); \ + (p_dst)[2] = (u8)(((u64)(src)) >> 16); \ + (p_dst)[3] = (u8)(((u64)(src)) >> 24); \ + (p_dst)[4] = (u8)(((u64)(src)) >> 32); \ + (p_dst)[5] = (u8)(((u64)(src)) >> 40); \ + (p_dst)[6] = (u8)(((u64)(src)) >> 48); \ + (p_dst)[7] = (u8)(((u64)(src)) >> 56); \ + } while (0) + +#ifdef __LITTLE_ENDIAN +#define GET16_A(p_src) (*((u16 *)(p_src))) +#define GET32_A(p_src) (*((u32 *)(p_src))) +#define GET64_A(p_src) (*((u64 *)(p_src))) +#define SET16_A(p_dst, src) (*((u16 *)(p_dst)) = (u16)(src)) +#define SET32_A(p_dst, src) (*((u32 *)(p_dst)) = (u32)(src)) +#define SET64_A(p_dst, src) (*((u64 *)(p_dst)) = (u64)(src)) +#else /* BIG_ENDIAN */ +#define GET16_A(p_src) GET16(p_src) +#define GET32_A(p_src) GET32(p_src) +#define GET64_A(p_src) GET64(p_src) +#define SET16_A(p_dst, src) SET16(p_dst, src) +#define SET32_A(p_dst, src) SET32(p_dst, src) +#define SET64_A(p_dst, src) SET64(p_dst, src) +#endif + +/* Upcase tabel mecro */ +#define HIGH_INDEX_BIT (8) +#define HIGH_INDEX_MASK (0xFF00) +#define LOW_INDEX_BIT (16-HIGH_INDEX_BIT) +#define UTBL_ROW_COUNT (1<> LOW_INDEX_BIT; +} +static inline u16 get_row_index(u16 i) +{ + return i & ~HIGH_INDEX_MASK; +} +/*----------------------------------------------------------------------*/ +/* Type Definitions */ +/*----------------------------------------------------------------------*/ + +/* MS_DOS FAT partition boot record (512 bytes) */ +typedef struct { + u8 jmp_boot[3]; + u8 oem_name[8]; + u8 bpb[109]; + u8 boot_code[390]; + u8 signature[2]; +} PBR_SECTOR_T; + +/* MS-DOS FAT12/16 BIOS parameter block (51 bytes) */ +typedef struct { + u8 sector_size[2]; + u8 sectors_per_clu; + u8 num_reserved[2]; + u8 num_fats; + u8 num_root_entries[2]; + u8 num_sectors[2]; + u8 media_type; + u8 num_fat_sectors[2]; + u8 sectors_in_track[2]; + u8 num_heads[2]; + u8 num_hid_sectors[4]; + u8 num_huge_sectors[4]; + + u8 phy_drv_no; + u8 reserved; + u8 ext_signature; + u8 vol_serial[4]; + u8 vol_label[11]; + u8 vol_type[8]; +} BPB16_T; + +/* MS-DOS FAT32 BIOS parameter block (79 bytes) */ +typedef struct { + u8 sector_size[2]; + u8 sectors_per_clu; + u8 num_reserved[2]; + u8 num_fats; + u8 num_root_entries[2]; + u8 num_sectors[2]; + u8 media_type; + u8 num_fat_sectors[2]; + u8 sectors_in_track[2]; + u8 num_heads[2]; + u8 num_hid_sectors[4]; + u8 num_huge_sectors[4]; + u8 num_fat32_sectors[4]; + u8 ext_flags[2]; + u8 fs_version[2]; + u8 root_cluster[4]; + u8 fsinfo_sector[2]; + u8 backup_sector[2]; + u8 reserved[12]; + + u8 phy_drv_no; + u8 ext_reserved; + u8 ext_signature; + u8 vol_serial[4]; + u8 vol_label[11]; + u8 vol_type[8]; +} BPB32_T; + +/* MS-DOS EXFAT BIOS parameter block (109 bytes) */ +typedef struct { + u8 reserved1[53]; + u8 vol_offset[8]; + u8 vol_length[8]; + u8 fat_offset[4]; + u8 fat_length[4]; + u8 clu_offset[4]; + u8 clu_count[4]; + u8 root_cluster[4]; + u8 vol_serial[4]; + u8 fs_version[2]; + u8 vol_flags[2]; + u8 sector_size_bits; + u8 sectors_per_clu_bits; + u8 num_fats; + u8 phy_drv_no; + u8 perc_in_use; + u8 reserved2[7]; +} BPBEX_T; + +/* MS-DOS FAT file system information sector (512 bytes) */ +typedef struct { + u8 signature1[4]; + u8 reserved1[480]; + u8 signature2[4]; + u8 free_cluster[4]; + u8 next_cluster[4]; + u8 reserved2[14]; + u8 signature3[2]; +} FSI_SECTOR_T; + +/* MS-DOS FAT directory entry (32 bytes) */ +typedef struct { + u8 dummy[32]; +} DENTRY_T; + +typedef struct { + u8 name[DOS_NAME_LENGTH]; + u8 attr; + u8 lcase; + u8 create_time_ms; + u8 create_time[2]; + u8 create_date[2]; + u8 access_date[2]; + u8 start_clu_hi[2]; + u8 modify_time[2]; + u8 modify_date[2]; + u8 start_clu_lo[2]; + u8 size[4]; +} DOS_DENTRY_T; + +/* MS-DOS FAT extended directory entry (32 bytes) */ +typedef struct { + u8 order; + u8 unicode_0_4[10]; + u8 attr; + u8 sysid; + u8 checksum; + u8 unicode_5_10[12]; + u8 start_clu[2]; + u8 unicode_11_12[4]; +} EXT_DENTRY_T; + +/* MS-DOS EXFAT file directory entry (32 bytes) */ +typedef struct { + u8 type; + u8 num_ext; + u8 checksum[2]; + u8 attr[2]; + u8 reserved1[2]; + u8 create_time[2]; + u8 create_date[2]; + u8 modify_time[2]; + u8 modify_date[2]; + u8 access_time[2]; + u8 access_date[2]; + u8 create_time_ms; + u8 modify_time_ms; + u8 access_time_ms; + u8 reserved2[9]; +} FILE_DENTRY_T; + +/* MS-DOS EXFAT stream extension directory entry (32 bytes) */ +typedef struct { + u8 type; + u8 flags; + u8 reserved1; + u8 name_len; + u8 name_hash[2]; + u8 reserved2[2]; + u8 valid_size[8]; + u8 reserved3[4]; + u8 start_clu[4]; + u8 size[8]; +} STRM_DENTRY_T; + +/* MS-DOS EXFAT file name directory entry (32 bytes) */ +typedef struct { + u8 type; + u8 flags; + u8 unicode_0_14[30]; +} NAME_DENTRY_T; + +/* MS-DOS EXFAT allocation bitmap directory entry (32 bytes) */ +typedef struct { + u8 type; + u8 flags; + u8 reserved[18]; + u8 start_clu[4]; + u8 size[8]; +} BMAP_DENTRY_T; + +/* MS-DOS EXFAT up-case table directory entry (32 bytes) */ +typedef struct { + u8 type; + u8 reserved1[3]; + u8 checksum[4]; + u8 reserved2[12]; + u8 start_clu[4]; + u8 size[8]; +} CASE_DENTRY_T; + +/* MS-DOS EXFAT volume label directory entry (32 bytes) */ +typedef struct { + u8 type; + u8 label_len; + u8 unicode_0_10[22]; + u8 reserved[8]; +} VOLM_DENTRY_T; + +/* unused entry hint information */ +typedef struct { + u32 dir; + s32 entry; + CHAIN_T clu; +} UENTRY_T; + +typedef struct { + s32 (*alloc_cluster)(struct super_block *sb, s32 num_alloc, CHAIN_T *p_chain); + void (*free_cluster)(struct super_block *sb, CHAIN_T *p_chain, s32 do_relse); + s32 (*count_used_clusters)(struct super_block *sb); + + s32 (*init_dir_entry)(struct super_block *sb, CHAIN_T *p_dir, s32 entry, u32 type, + u32 start_clu, u64 size); + s32 (*init_ext_entry)(struct super_block *sb, CHAIN_T *p_dir, s32 entry, s32 num_entries, + UNI_NAME_T *p_uniname, DOS_NAME_T *p_dosname); + s32 (*find_dir_entry)(struct super_block *sb, CHAIN_T *p_dir, UNI_NAME_T *p_uniname, s32 num_entries, DOS_NAME_T *p_dosname, u32 type); + void (*delete_dir_entry)(struct super_block *sb, CHAIN_T *p_dir, s32 entry, s32 offset, s32 num_entries); + void (*get_uni_name_from_ext_entry)(struct super_block *sb, CHAIN_T *p_dir, s32 entry, u16 *uniname); + s32 (*count_ext_entries)(struct super_block *sb, CHAIN_T *p_dir, s32 entry, DENTRY_T *p_entry); + s32 (*calc_num_entries)(UNI_NAME_T *p_uniname); + + u32 (*get_entry_type)(DENTRY_T *p_entry); + void (*set_entry_type)(DENTRY_T *p_entry, u32 type); + u32 (*get_entry_attr)(DENTRY_T *p_entry); + void (*set_entry_attr)(DENTRY_T *p_entry, u32 attr); + u8 (*get_entry_flag)(DENTRY_T *p_entry); + void (*set_entry_flag)(DENTRY_T *p_entry, u8 flag); + u32 (*get_entry_clu0)(DENTRY_T *p_entry); + void (*set_entry_clu0)(DENTRY_T *p_entry, u32 clu0); + u64 (*get_entry_size)(DENTRY_T *p_entry); + void (*set_entry_size)(DENTRY_T *p_entry, u64 size); + void (*get_entry_time)(DENTRY_T *p_entry, TIMESTAMP_T *tp, u8 mode); + void (*set_entry_time)(DENTRY_T *p_entry, TIMESTAMP_T *tp, u8 mode); +} FS_FUNC_T; + +typedef struct __FS_INFO_T { + u32 drv; /* drive ID */ + u32 vol_type; /* volume FAT type */ + u32 vol_id; /* volume serial number */ + + u64 num_sectors; /* num of sectors in volume */ + u32 num_clusters; /* num of clusters in volume */ + u32 cluster_size; /* cluster size in bytes */ + u32 cluster_size_bits; + u32 sectors_per_clu; /* cluster size in sectors */ + u32 sectors_per_clu_bits; + + u32 PBR_sector; /* PBR sector */ + u32 FAT1_start_sector; /* FAT1 start sector */ + u32 FAT2_start_sector; /* FAT2 start sector */ + u32 root_start_sector; /* root dir start sector */ + u32 data_start_sector; /* data area start sector */ + u32 num_FAT_sectors; /* num of FAT sectors */ + + u32 root_dir; /* root dir cluster */ + u32 dentries_in_root; /* num of dentries in root dir */ + u32 dentries_per_clu; /* num of dentries per cluster */ + + u32 vol_flag; /* volume dirty flag */ + struct buffer_head *pbr_bh; /* PBR sector */ + + u32 map_clu; /* allocation bitmap start cluster */ + u32 map_sectors; /* num of allocation bitmap sectors */ + struct buffer_head **vol_amap; /* allocation bitmap */ + + u16 **vol_utbl; /* upcase table */ + + u32 clu_srch_ptr; /* cluster search pointer */ + u32 used_clusters; /* number of used clusters */ + UENTRY_T hint_uentry; /* unused entry hint information */ + + u32 dev_ejected; /* block device operation error flag */ + + FS_FUNC_T *fs_func; + struct semaphore v_sem; + + /* FAT cache */ + BUF_CACHE_T FAT_cache_array[FAT_CACHE_SIZE]; + BUF_CACHE_T FAT_cache_lru_list; + BUF_CACHE_T FAT_cache_hash_list[FAT_CACHE_HASH_SIZE]; + + /* buf cache */ + BUF_CACHE_T buf_cache_array[BUF_CACHE_SIZE]; + BUF_CACHE_T buf_cache_lru_list; + BUF_CACHE_T buf_cache_hash_list[BUF_CACHE_HASH_SIZE]; +} FS_INFO_T; + +#define ES_2_ENTRIES 2 +#define ES_3_ENTRIES 3 +#define ES_ALL_ENTRIES 0 + +typedef struct { + sector_t sector; /* sector number that contains file_entry */ + s32 offset; /* byte offset in the sector */ + s32 alloc_flag; /* flag in stream entry. 01 for cluster chain, 03 for contig. clusteres. */ + u32 num_entries; + + /* __buf should be the last member */ + void *__buf; +} ENTRY_SET_CACHE_T; + +/*----------------------------------------------------------------------*/ +/* External Function Declarations */ +/*----------------------------------------------------------------------*/ + +/* file system initialization & shutdown functions */ +s32 ffsInit(void); +s32 ffsShutdown(void); + +/* volume management functions */ +s32 ffsMountVol(struct super_block *sb); +s32 ffsUmountVol(struct super_block *sb); +s32 ffsCheckVol(struct super_block *sb); +s32 ffsGetVolInfo(struct super_block *sb, VOL_INFO_T *info); +s32 ffsSyncVol(struct super_block *sb, s32 do_sync); + +/* file management functions */ +s32 ffsLookupFile(struct inode *inode, char *path, FILE_ID_T *fid); +s32 ffsCreateFile(struct inode *inode, char *path, u8 mode, FILE_ID_T *fid); +s32 ffsReadFile(struct inode *inode, FILE_ID_T *fid, void *buffer, u64 count, u64 *rcount); +s32 ffsWriteFile(struct inode *inode, FILE_ID_T *fid, void *buffer, u64 count, u64 *wcount); +s32 ffsTruncateFile(struct inode *inode, u64 old_size, u64 new_size); +s32 ffsMoveFile(struct inode *old_parent_inode, FILE_ID_T *fid, struct inode *new_parent_inode, struct dentry *new_dentry); +s32 ffsRemoveFile(struct inode *inode, FILE_ID_T *fid); +s32 ffsSetAttr(struct inode *inode, u32 attr); +s32 ffsGetStat(struct inode *inode, DIR_ENTRY_T *info); +s32 ffsSetStat(struct inode *inode, DIR_ENTRY_T *info); +s32 ffsMapCluster(struct inode *inode, s32 clu_offset, u32 *clu); + +/* directory management functions */ +s32 ffsCreateDir(struct inode *inode, char *path, FILE_ID_T *fid); +s32 ffsReadDir(struct inode *inode, DIR_ENTRY_T *dir_ent); +s32 ffsRemoveDir(struct inode *inode, FILE_ID_T *fid); + +/*----------------------------------------------------------------------*/ +/* External Function Declarations (NOT TO UPPER LAYER) */ +/*----------------------------------------------------------------------*/ + +/* fs management functions */ +s32 fs_init(void); +s32 fs_shutdown(void); +void fs_set_vol_flags(struct super_block *sb, u32 new_flag); +void fs_sync(struct super_block *sb, s32 do_sync); +void fs_error(struct super_block *sb); + +/* cluster management functions */ +s32 clear_cluster(struct super_block *sb, u32 clu); +s32 fat_alloc_cluster(struct super_block *sb, s32 num_alloc, CHAIN_T *p_chain); +s32 exfat_alloc_cluster(struct super_block *sb, s32 num_alloc, CHAIN_T *p_chain); +void fat_free_cluster(struct super_block *sb, CHAIN_T *p_chain, s32 do_relse); +void exfat_free_cluster(struct super_block *sb, CHAIN_T *p_chain, s32 do_relse); +u32 find_last_cluster(struct super_block *sb, CHAIN_T *p_chain); +s32 count_num_clusters(struct super_block *sb, CHAIN_T *dir); +s32 fat_count_used_clusters(struct super_block *sb); +s32 exfat_count_used_clusters(struct super_block *sb); +void exfat_chain_cont_cluster(struct super_block *sb, u32 chain, s32 len); + +/* allocation bitmap management functions */ +s32 load_alloc_bitmap(struct super_block *sb); +void free_alloc_bitmap(struct super_block *sb); +s32 set_alloc_bitmap(struct super_block *sb, u32 clu); +s32 clr_alloc_bitmap(struct super_block *sb, u32 clu); +u32 test_alloc_bitmap(struct super_block *sb, u32 clu); +void sync_alloc_bitmap(struct super_block *sb); + +/* upcase table management functions */ +s32 load_upcase_table(struct super_block *sb); +void free_upcase_table(struct super_block *sb); + +/* dir entry management functions */ +u32 fat_get_entry_type(DENTRY_T *p_entry); +u32 exfat_get_entry_type(DENTRY_T *p_entry); +void fat_set_entry_type(DENTRY_T *p_entry, u32 type); +void exfat_set_entry_type(DENTRY_T *p_entry, u32 type); +u32 fat_get_entry_attr(DENTRY_T *p_entry); +u32 exfat_get_entry_attr(DENTRY_T *p_entry); +void fat_set_entry_attr(DENTRY_T *p_entry, u32 attr); +void exfat_set_entry_attr(DENTRY_T *p_entry, u32 attr); +u8 fat_get_entry_flag(DENTRY_T *p_entry); +u8 exfat_get_entry_flag(DENTRY_T *p_entry); +void fat_set_entry_flag(DENTRY_T *p_entry, u8 flag); +void exfat_set_entry_flag(DENTRY_T *p_entry, u8 flag); +u32 fat_get_entry_clu0(DENTRY_T *p_entry); +u32 exfat_get_entry_clu0(DENTRY_T *p_entry); +void fat_set_entry_clu0(DENTRY_T *p_entry, u32 start_clu); +void exfat_set_entry_clu0(DENTRY_T *p_entry, u32 start_clu); +u64 fat_get_entry_size(DENTRY_T *p_entry); +u64 exfat_get_entry_size(DENTRY_T *p_entry); +void fat_set_entry_size(DENTRY_T *p_entry, u64 size); +void exfat_set_entry_size(DENTRY_T *p_entry, u64 size); +void fat_get_entry_time(DENTRY_T *p_entry, TIMESTAMP_T *tp, u8 mode); +void exfat_get_entry_time(DENTRY_T *p_entry, TIMESTAMP_T *tp, u8 mode); +void fat_set_entry_time(DENTRY_T *p_entry, TIMESTAMP_T *tp, u8 mode); +void exfat_set_entry_time(DENTRY_T *p_entry, TIMESTAMP_T *tp, u8 mode); +s32 fat_init_dir_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, u32 type, u32 start_clu, u64 size); +s32 exfat_init_dir_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, u32 type, u32 start_clu, u64 size); +s32 fat_init_ext_dir_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, s32 num_entries, UNI_NAME_T *p_uniname, DOS_NAME_T *p_dosname); +s32 exfat_init_ext_dir_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, s32 num_entries, UNI_NAME_T *p_uniname, DOS_NAME_T *p_dosname); +void init_dos_entry(DOS_DENTRY_T *ep, u32 type, u32 start_clu); +void init_ext_entry(EXT_DENTRY_T *ep, s32 order, u8 chksum, u16 *uniname); +void init_file_entry(FILE_DENTRY_T *ep, u32 type); +void init_strm_entry(STRM_DENTRY_T *ep, u8 flags, u32 start_clu, u64 size); +void init_name_entry(NAME_DENTRY_T *ep, u16 *uniname); +void fat_delete_dir_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, s32 order, s32 num_entries); +void exfat_delete_dir_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, s32 order, s32 num_entries); + +s32 find_location(struct super_block *sb, CHAIN_T *p_dir, s32 entry, sector_t *sector, s32 *offset); +DENTRY_T *get_entry_with_sector(struct super_block *sb, sector_t sector, s32 offset); +DENTRY_T *get_entry_in_dir(struct super_block *sb, CHAIN_T *p_dir, s32 entry, sector_t *sector); +ENTRY_SET_CACHE_T *get_entry_set_in_dir(struct super_block *sb, CHAIN_T *p_dir, s32 entry, u32 type, DENTRY_T **file_ep); +void release_entry_set(ENTRY_SET_CACHE_T *es); +s32 write_whole_entry_set(struct super_block *sb, ENTRY_SET_CACHE_T *es); +s32 write_partial_entries_in_entry_set(struct super_block *sb, ENTRY_SET_CACHE_T *es, DENTRY_T *ep, u32 count); +s32 search_deleted_or_unused_entry(struct super_block *sb, CHAIN_T *p_dir, s32 num_entries); +s32 find_empty_entry(struct inode *inode, CHAIN_T *p_dir, s32 num_entries); +s32 fat_find_dir_entry(struct super_block *sb, CHAIN_T *p_dir, UNI_NAME_T *p_uniname, s32 num_entries, DOS_NAME_T *p_dosname, u32 type); +s32 exfat_find_dir_entry(struct super_block *sb, CHAIN_T *p_dir, UNI_NAME_T *p_uniname, s32 num_entries, DOS_NAME_T *p_dosname, u32 type); +s32 fat_count_ext_entries(struct super_block *sb, CHAIN_T *p_dir, s32 entry, DENTRY_T *p_entry); +s32 exfat_count_ext_entries(struct super_block *sb, CHAIN_T *p_dir, s32 entry, DENTRY_T *p_entry); +s32 count_dos_name_entries(struct super_block *sb, CHAIN_T *p_dir, u32 type); +void update_dir_checksum(struct super_block *sb, CHAIN_T *p_dir, s32 entry); +void update_dir_checksum_with_entry_set(struct super_block *sb, ENTRY_SET_CACHE_T *es); +bool is_dir_empty(struct super_block *sb, CHAIN_T *p_dir); + +/* name conversion functions */ +s32 get_num_entries_and_dos_name(struct super_block *sb, CHAIN_T *p_dir, UNI_NAME_T *p_uniname, s32 *entries, DOS_NAME_T *p_dosname); +void get_uni_name_from_dos_entry(struct super_block *sb, DOS_DENTRY_T *ep, UNI_NAME_T *p_uniname, u8 mode); +void fat_get_uni_name_from_ext_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, u16 *uniname); +void exfat_get_uni_name_from_ext_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, u16 *uniname); +s32 extract_uni_name_from_ext_entry(EXT_DENTRY_T *ep, u16 *uniname, s32 order); +s32 extract_uni_name_from_name_entry(NAME_DENTRY_T *ep, u16 *uniname, s32 order); +s32 fat_generate_dos_name(struct super_block *sb, CHAIN_T *p_dir, DOS_NAME_T *p_dosname); +void fat_attach_count_to_dos_name(u8 *dosname, s32 count); +s32 fat_calc_num_entries(UNI_NAME_T *p_uniname); +s32 exfat_calc_num_entries(UNI_NAME_T *p_uniname); +u8 calc_checksum_1byte(void *data, s32 len, u8 chksum); +u16 calc_checksum_2byte(void *data, s32 len, u16 chksum, s32 type); +u32 calc_checksum_4byte(void *data, s32 len, u32 chksum, s32 type); + +/* name resolution functions */ +s32 resolve_path(struct inode *inode, char *path, CHAIN_T *p_dir, UNI_NAME_T *p_uniname); +s32 resolve_name(u8 *name, u8 **arg); + +/* file operation functions */ +s32 fat16_mount(struct super_block *sb, PBR_SECTOR_T *p_pbr); +s32 fat32_mount(struct super_block *sb, PBR_SECTOR_T *p_pbr); +s32 exfat_mount(struct super_block *sb, PBR_SECTOR_T *p_pbr); +s32 create_dir(struct inode *inode, CHAIN_T *p_dir, UNI_NAME_T *p_uniname, FILE_ID_T *fid); +s32 create_file(struct inode *inode, CHAIN_T *p_dir, UNI_NAME_T *p_uniname, u8 mode, FILE_ID_T *fid); +void remove_file(struct inode *inode, CHAIN_T *p_dir, s32 entry); +s32 rename_file(struct inode *inode, CHAIN_T *p_dir, s32 old_entry, UNI_NAME_T *p_uniname, FILE_ID_T *fid); +s32 move_file(struct inode *inode, CHAIN_T *p_olddir, s32 oldentry, CHAIN_T *p_newdir, UNI_NAME_T *p_uniname, FILE_ID_T *fid); + +/* sector read/write functions */ +s32 sector_read(struct super_block *sb, sector_t sec, struct buffer_head **bh, s32 read); +s32 sector_write(struct super_block *sb, sector_t sec, struct buffer_head *bh, s32 sync); +s32 multi_sector_read(struct super_block *sb, sector_t sec, struct buffer_head **bh, s32 num_secs, s32 read); +s32 multi_sector_write(struct super_block *sb, sector_t sec, struct buffer_head *bh, s32 num_secs, s32 sync); + +#endif /* _EXFAT_H */ diff --git a/fs/exfat/exfat_data.c b/fs/exfat/exfat_data.c new file mode 100644 index 0000000000000000..65da07aff547a2dd --- /dev/null +++ b/fs/exfat/exfat_data.c @@ -0,0 +1,77 @@ +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +/************************************************************************/ +/* */ +/* PROJECT : exFAT & FAT12/16/32 File System */ +/* FILE : exfat_data.c */ +/* PURPOSE : exFAT Configuable Data Definitions */ +/* */ +/*----------------------------------------------------------------------*/ +/* NOTES */ +/* */ +/*----------------------------------------------------------------------*/ +/* REVISION HISTORY (Ver 0.9) */ +/* */ +/* - 2010.11.15 [Joosun Hahn] : first writing */ +/* */ +/************************************************************************/ + +#include "exfat_config.h" +#include "exfat_data.h" +#include "exfat_oal.h" + +#include "exfat_blkdev.h" +#include "exfat_cache.h" +#include "exfat_nls.h" +#include "exfat_super.h" +#include "exfat_core.h" + +/*======================================================================*/ +/* */ +/* GLOBAL VARIABLE DEFINITIONS */ +/* */ +/*======================================================================*/ + +/*----------------------------------------------------------------------*/ +/* File Manager */ +/*----------------------------------------------------------------------*/ + +/*----------------------------------------------------------------------*/ +/* Buffer Manager */ +/*----------------------------------------------------------------------*/ + +/* FAT cache */ +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) +DECLARE_MUTEX(f_sem); +#else +DEFINE_SEMAPHORE(f_sem); +#endif +BUF_CACHE_T FAT_cache_array[FAT_CACHE_SIZE]; +BUF_CACHE_T FAT_cache_lru_list; +BUF_CACHE_T FAT_cache_hash_list[FAT_CACHE_HASH_SIZE]; + +/* buf cache */ +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) +DECLARE_MUTEX(b_sem); +#else +DEFINE_SEMAPHORE(b_sem); +#endif +BUF_CACHE_T buf_cache_array[BUF_CACHE_SIZE]; +BUF_CACHE_T buf_cache_lru_list; +BUF_CACHE_T buf_cache_hash_list[BUF_CACHE_HASH_SIZE]; diff --git a/fs/exfat/exfat_data.h b/fs/exfat/exfat_data.h new file mode 100644 index 0000000000000000..53b0e39397fa114c --- /dev/null +++ b/fs/exfat/exfat_data.h @@ -0,0 +1,58 @@ +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +/************************************************************************/ +/* */ +/* PROJECT : exFAT & FAT12/16/32 File System */ +/* FILE : exfat_data.h */ +/* PURPOSE : Header File for exFAT Configuable Constants */ +/* */ +/*----------------------------------------------------------------------*/ +/* NOTES */ +/* */ +/*----------------------------------------------------------------------*/ +/* REVISION HISTORY (Ver 0.9) */ +/* */ +/* - 2010.11.15 [Joosun Hahn] : first writing */ +/* */ +/************************************************************************/ + +#ifndef _EXFAT_DATA_H +#define _EXFAT_DATA_H + +#include "exfat_config.h" + +/*======================================================================*/ +/* */ +/* FFS CONFIGURATIONS */ +/* (CHANGE THIS PART IF REQUIRED) */ +/* */ +/*======================================================================*/ + +/* max number of root directory entries in FAT12/16 */ +/* (should be an exponential value of 2) */ +#define MAX_DENTRY 512 + +/* cache size (in number of sectors) */ +/* (should be an exponential value of 2) */ +#define FAT_CACHE_SIZE 128 +#define FAT_CACHE_HASH_SIZE 64 +#define BUF_CACHE_SIZE 256 +#define BUF_CACHE_HASH_SIZE 64 + +#endif /* _EXFAT_DATA_H */ diff --git a/fs/exfat/exfat_nls.c b/fs/exfat/exfat_nls.c new file mode 100644 index 0000000000000000..a48b3d05a7c4bcad --- /dev/null +++ b/fs/exfat/exfat_nls.c @@ -0,0 +1,448 @@ +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +/************************************************************************/ +/* */ +/* PROJECT : exFAT & FAT12/16/32 File System */ +/* FILE : exfat_nls.c */ +/* PURPOSE : exFAT NLS Manager */ +/* */ +/*----------------------------------------------------------------------*/ +/* NOTES */ +/* */ +/*----------------------------------------------------------------------*/ +/* REVISION HISTORY (Ver 0.9) */ +/* */ +/* - 2010.11.15 [Joosun Hahn] : first writing */ +/* */ +/************************************************************************/ + +#include "exfat_config.h" +#include "exfat_data.h" + +#include "exfat_nls.h" +#include "exfat_api.h" +#include "exfat_super.h" +#include "exfat_core.h" + +#include + +/*----------------------------------------------------------------------*/ +/* Global Variable Definitions */ +/*----------------------------------------------------------------------*/ + +/*----------------------------------------------------------------------*/ +/* Local Variable Definitions */ +/*----------------------------------------------------------------------*/ + +static u16 bad_dos_chars[] = { + /* + , ; = [ ] */ + 0x002B, 0x002C, 0x003B, 0x003D, 0x005B, 0x005D, + 0xFF0B, 0xFF0C, 0xFF1B, 0xFF1D, 0xFF3B, 0xFF3D, + 0 +}; + +static u16 bad_uni_chars[] = { + /* " * / : < > ? \ | */ + 0x0022, 0x002A, 0x002F, 0x003A, + 0x003C, 0x003E, 0x003F, 0x005C, 0x007C, + 0 +}; + +/*----------------------------------------------------------------------*/ +/* Local Function Declarations */ +/*----------------------------------------------------------------------*/ + +static s32 convert_uni_to_ch(struct nls_table *nls, u8 *ch, u16 uni, s32 *lossy); +static s32 convert_ch_to_uni(struct nls_table *nls, u16 *uni, u8 *ch, s32 *lossy); + +/*======================================================================*/ +/* Global Function Definitions */ +/*======================================================================*/ + +u16 nls_upper(struct super_block *sb, u16 a) +{ + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + + if (EXFAT_SB(sb)->options.casesensitive) + return a; + if (p_fs->vol_utbl != NULL && (p_fs->vol_utbl)[get_col_index(a)] != NULL) + return (p_fs->vol_utbl)[get_col_index(a)][get_row_index(a)]; + else + return a; +} + +u16 *nls_wstrchr(u16 *str, u16 wchar) +{ + while (*str) { + if (*(str++) == wchar) + return str; + } + + return 0; +} + +s32 nls_dosname_cmp(struct super_block *sb, u8 *a, u8 *b) +{ + return strncmp((void *) a, (void *) b, DOS_NAME_LENGTH); +} /* end of nls_dosname_cmp */ + +s32 nls_uniname_cmp(struct super_block *sb, u16 *a, u16 *b) +{ + int i; + + for (i = 0; i < MAX_NAME_LENGTH; i++, a++, b++) { + if (nls_upper(sb, *a) != nls_upper(sb, *b)) + return 1; + if (*a == 0x0) + return 0; + } + return 0; +} /* end of nls_uniname_cmp */ + +void nls_uniname_to_dosname(struct super_block *sb, DOS_NAME_T *p_dosname, UNI_NAME_T *p_uniname, s32 *p_lossy) +{ + int i, j, len, lossy = FALSE; + u8 buf[MAX_CHARSET_SIZE]; + u8 lower = 0, upper = 0; + u8 *dosname = p_dosname->name; + u16 *uniname = p_uniname->name; + u16 *p, *last_period; + struct nls_table *nls = EXFAT_SB(sb)->nls_disk; + + for (i = 0; i < DOS_NAME_LENGTH; i++) + *(dosname+i) = ' '; + + if (!nls_uniname_cmp(sb, uniname, (u16 *) UNI_CUR_DIR_NAME)) { + *(dosname) = '.'; + p_dosname->name_case = 0x0; + if (p_lossy != NULL) + *p_lossy = FALSE; + return; + } + + if (!nls_uniname_cmp(sb, uniname, (u16 *) UNI_PAR_DIR_NAME)) { + *(dosname) = '.'; + *(dosname+1) = '.'; + p_dosname->name_case = 0x0; + if (p_lossy != NULL) + *p_lossy = FALSE; + return; + } + + /* search for the last embedded period */ + last_period = NULL; + for (p = uniname; *p; p++) { + if (*p == (u16) '.') + last_period = p; + } + + i = 0; + while (i < DOS_NAME_LENGTH) { + if (i == 8) { + if (last_period == NULL) + break; + + if (uniname <= last_period) { + if (uniname < last_period) + lossy = TRUE; + uniname = last_period + 1; + } + } + + if (*uniname == (u16) '\0') { + break; + } else if (*uniname == (u16) ' ') { + lossy = TRUE; + } else if (*uniname == (u16) '.') { + if (uniname < last_period) + lossy = TRUE; + else + i = 8; + } else if (nls_wstrchr(bad_dos_chars, *uniname)) { + lossy = TRUE; + *(dosname+i) = '_'; + i++; + } else { + len = convert_uni_to_ch(nls, buf, *uniname, &lossy); + + if (len > 1) { + if ((i >= 8) && ((i+len) > DOS_NAME_LENGTH)) + break; + + if ((i < 8) && ((i+len) > 8)) { + i = 8; + continue; + } + + lower = 0xFF; + + for (j = 0; j < len; j++, i++) + *(dosname+i) = *(buf+j); + } else { /* len == 1 */ + if ((*buf >= 'a') && (*buf <= 'z')) { + *(dosname+i) = *buf - ('a' - 'A'); + + if (i < 8) + lower |= 0x08; + else + lower |= 0x10; + } else if ((*buf >= 'A') && (*buf <= 'Z')) { + *(dosname+i) = *buf; + + if (i < 8) + upper |= 0x08; + else + upper |= 0x10; + } else { + *(dosname+i) = *buf; + } + i++; + } + } + + uniname++; + } + + if (*dosname == 0xE5) + *dosname = 0x05; + + if (*uniname != 0x0) + lossy = TRUE; + + if (upper & lower) + p_dosname->name_case = 0xFF; + else + p_dosname->name_case = lower; + + if (p_lossy != NULL) + *p_lossy = lossy; +} /* end of nls_uniname_to_dosname */ + +void nls_dosname_to_uniname(struct super_block *sb, UNI_NAME_T *p_uniname, DOS_NAME_T *p_dosname) +{ + int i = 0, j, n = 0; + u8 buf[DOS_NAME_LENGTH+2]; + u8 *dosname = p_dosname->name; + u16 *uniname = p_uniname->name; + struct nls_table *nls = EXFAT_SB(sb)->nls_disk; + + if (*dosname == 0x05) { + *buf = 0xE5; + i++; + n++; + } + + for (; i < 8; i++, n++) { + if (*(dosname+i) == ' ') + break; + + if ((*(dosname+i) >= 'A') && (*(dosname+i) <= 'Z') && (p_dosname->name_case & 0x08)) + *(buf+n) = *(dosname+i) + ('a' - 'A'); + else + *(buf+n) = *(dosname+i); + } + if (*(dosname+8) != ' ') { + *(buf+n) = '.'; + n++; + } + + for (i = 8; i < DOS_NAME_LENGTH; i++, n++) { + if (*(dosname+i) == ' ') + break; + + if ((*(dosname+i) >= 'A') && (*(dosname+i) <= 'Z') && (p_dosname->name_case & 0x10)) + *(buf+n) = *(dosname+i) + ('a' - 'A'); + else + *(buf+n) = *(dosname+i); + } + *(buf+n) = '\0'; + + i = j = 0; + while (j < (MAX_NAME_LENGTH-1)) { + if (*(buf+i) == '\0') + break; + + i += convert_ch_to_uni(nls, uniname, (buf+i), NULL); + + uniname++; + j++; + } + + *uniname = (u16) '\0'; +} /* end of nls_dosname_to_uniname */ + +void nls_uniname_to_cstring(struct super_block *sb, u8 *p_cstring, UNI_NAME_T *p_uniname) +{ + int i, j, len; + u8 buf[MAX_CHARSET_SIZE]; + u16 *uniname = p_uniname->name; + struct nls_table *nls = EXFAT_SB(sb)->nls_io; + + if (nls == NULL) { + len = utf16s_to_utf8s(uniname, MAX_NAME_LENGTH, UTF16_HOST_ENDIAN, p_cstring, MAX_NAME_LENGTH); + p_cstring[len] = 0; + return; + } + + i = 0; + while (i < (MAX_NAME_LENGTH-1)) { + if (*uniname == (u16) '\0') + break; + + len = convert_uni_to_ch(nls, buf, *uniname, NULL); + + if (len > 1) { + for (j = 0; j < len; j++) + *p_cstring++ = (char) *(buf+j); + } else { /* len == 1 */ + *p_cstring++ = (char) *buf; + } + + uniname++; + i++; + } + + *p_cstring = '\0'; +} /* end of nls_uniname_to_cstring */ + +void nls_cstring_to_uniname(struct super_block *sb, UNI_NAME_T *p_uniname, u8 *p_cstring, s32 *p_lossy) +{ + int i, j, lossy = FALSE; + u8 *end_of_name; + u8 upname[MAX_NAME_LENGTH * 2]; + u16 *uniname = p_uniname->name; + struct nls_table *nls = EXFAT_SB(sb)->nls_io; + + + /* strip all trailing spaces */ + end_of_name = p_cstring + strlen((char *) p_cstring); + + while (*(--end_of_name) == ' ') { + if (end_of_name < p_cstring) + break; + } + *(++end_of_name) = '\0'; + + if (strcmp((char *) p_cstring, ".") && strcmp((char *) p_cstring, "..")) { + + /* strip all trailing periods */ + while (*(--end_of_name) == '.') { + if (end_of_name < p_cstring) + break; + } + *(++end_of_name) = '\0'; + } + + if (*p_cstring == '\0') + lossy = TRUE; + + if (nls == NULL) { +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,0,101) + i = utf8s_to_utf16s(p_cstring, MAX_NAME_LENGTH, uniname); +#else + i = utf8s_to_utf16s(p_cstring, MAX_NAME_LENGTH, UTF16_HOST_ENDIAN, uniname, MAX_NAME_LENGTH); +#endif + for (j = 0; j < i; j++) + SET16_A(upname + j * 2, nls_upper(sb, uniname[j])); + uniname[i] = '\0'; + } + else { + i = j = 0; + while (j < (MAX_NAME_LENGTH-1)) { + if (*(p_cstring+i) == '\0') + break; + + i += convert_ch_to_uni(nls, uniname, (u8 *)(p_cstring+i), &lossy); + + if ((*uniname < 0x0020) || nls_wstrchr(bad_uni_chars, *uniname)) + lossy = TRUE; + + SET16_A(upname + j * 2, nls_upper(sb, *uniname)); + + uniname++; + j++; + } + + if (*(p_cstring+i) != '\0') + lossy = TRUE; + *uniname = (u16) '\0'; + } + + p_uniname->name_len = j; + p_uniname->name_hash = calc_checksum_2byte((void *) upname, j<<1, 0, CS_DEFAULT); + + if (p_lossy != NULL) + *p_lossy = lossy; +} /* end of nls_cstring_to_uniname */ + +/*======================================================================*/ +/* Local Function Definitions */ +/*======================================================================*/ + +static s32 convert_ch_to_uni(struct nls_table *nls, u16 *uni, u8 *ch, s32 *lossy) +{ + int len; + + *uni = 0x0; + + if (ch[0] < 0x80) { + *uni = (u16) ch[0]; + return 1; + } + + len = nls->char2uni(ch, NLS_MAX_CHARSET_SIZE, uni); + if (len < 0) { + /* conversion failed */ + printk("%s: fail to use nls\n", __func__); + if (lossy != NULL) + *lossy = TRUE; + *uni = (u16) '_'; + if (!strcmp(nls->charset, "utf8")) + return 1; + else + return 2; + } + + return len; +} /* end of convert_ch_to_uni */ + +static s32 convert_uni_to_ch(struct nls_table *nls, u8 *ch, u16 uni, s32 *lossy) +{ + int len; + + ch[0] = 0x0; + + if (uni < 0x0080) { + ch[0] = (u8) uni; + return 1; + } + + len = nls->uni2char(uni, ch, NLS_MAX_CHARSET_SIZE); + if (len < 0) { + /* conversion failed */ + printk("%s: fail to use nls\n", __func__); + if (lossy != NULL) + *lossy = TRUE; + ch[0] = '_'; + return 1; + } + + return len; + +} /* end of convert_uni_to_ch */ diff --git a/fs/exfat/exfat_nls.h b/fs/exfat/exfat_nls.h new file mode 100644 index 0000000000000000..bc516d762e903bed --- /dev/null +++ b/fs/exfat/exfat_nls.h @@ -0,0 +1,91 @@ +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +/************************************************************************/ +/* */ +/* PROJECT : exFAT & FAT12/16/32 File System */ +/* FILE : exfat_nls.h */ +/* PURPOSE : Header File for exFAT NLS Manager */ +/* */ +/*----------------------------------------------------------------------*/ +/* NOTES */ +/* */ +/*----------------------------------------------------------------------*/ +/* REVISION HISTORY (Ver 0.9) */ +/* */ +/* - 2010.11.15 [Joosun Hahn] : first writing */ +/* */ +/************************************************************************/ + +#ifndef _EXFAT_NLS_H +#define _EXFAT_NLS_H + +#include +#include + +#include "exfat_config.h" +#include "exfat_api.h" + +/*----------------------------------------------------------------------*/ +/* Constant & Macro Definitions */ +/*----------------------------------------------------------------------*/ + +#define NUM_UPCASE 2918 + +#define DOS_CUR_DIR_NAME ". " +#define DOS_PAR_DIR_NAME ".. " + +#ifdef __LITTLE_ENDIAN +#define UNI_CUR_DIR_NAME ".\0" +#define UNI_PAR_DIR_NAME ".\0.\0" +#else +#define UNI_CUR_DIR_NAME "\0." +#define UNI_PAR_DIR_NAME "\0.\0." +#endif + +/*----------------------------------------------------------------------*/ +/* Type Definitions */ +/*----------------------------------------------------------------------*/ + +/* DOS name stucture */ +typedef struct { + u8 name[DOS_NAME_LENGTH]; + u8 name_case; +} DOS_NAME_T; + +/* unicode name stucture */ +typedef struct { + u16 name[MAX_NAME_LENGTH]; + u16 name_hash; + u8 name_len; +} UNI_NAME_T; + +/*----------------------------------------------------------------------*/ +/* External Function Declarations */ +/*----------------------------------------------------------------------*/ + +/* NLS management function */ +u16 nls_upper(struct super_block *sb, u16 a); +s32 nls_dosname_cmp(struct super_block *sb, u8 *a, u8 *b); +s32 nls_uniname_cmp(struct super_block *sb, u16 *a, u16 *b); +void nls_uniname_to_dosname(struct super_block *sb, DOS_NAME_T *p_dosname, UNI_NAME_T *p_uniname, s32 *p_lossy); +void nls_dosname_to_uniname(struct super_block *sb, UNI_NAME_T *p_uniname, DOS_NAME_T *p_dosname); +void nls_uniname_to_cstring(struct super_block *sb, u8 *p_cstring, UNI_NAME_T *p_uniname); +void nls_cstring_to_uniname(struct super_block *sb, UNI_NAME_T *p_uniname, u8 *p_cstring, s32 *p_lossy); + +#endif /* _EXFAT_NLS_H */ diff --git a/fs/exfat/exfat_oal.c b/fs/exfat/exfat_oal.c new file mode 100644 index 0000000000000000..743544244ca899d8 --- /dev/null +++ b/fs/exfat/exfat_oal.c @@ -0,0 +1,196 @@ +/* Some of the source code in this file came from "linux/fs/fat/misc.c". */ +/* + * linux/fs/fat/misc.c + * + * Written 1992,1993 by Werner Almesberger + * 22/11/2000 - Fixed fat_date_unix2dos for dates earlier than 01/01/1980 + * and date_dos2unix for date==0 by Igor Zhbanov(bsg@uniyar.ac.ru) + */ + +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +/************************************************************************/ +/* */ +/* PROJECT : exFAT & FAT12/16/32 File System */ +/* FILE : exfat_oal.c */ +/* PURPOSE : exFAT OS Adaptation Layer */ +/* (Semaphore Functions & Real-Time Clock Functions) */ +/* */ +/*----------------------------------------------------------------------*/ +/* NOTES */ +/* */ +/*----------------------------------------------------------------------*/ +/* REVISION HISTORY (Ver 0.9) */ +/* */ +/* - 2010.11.15 [Joosun Hahn] : first writing */ +/* */ +/************************************************************************/ + +#include +#include + +#include "exfat_config.h" +#include "exfat_api.h" +#include "exfat_oal.h" + +/*======================================================================*/ +/* */ +/* SEMAPHORE FUNCTIONS */ +/* */ +/*======================================================================*/ + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) +DECLARE_MUTEX(z_sem); +#else +DEFINE_SEMAPHORE(z_sem); +#endif + +s32 sm_init(struct semaphore *sm) +{ + sema_init(sm, 1); + return 0; +} /* end of sm_init */ + +s32 sm_P(struct semaphore *sm) +{ + down(sm); + return 0; +} /* end of sm_P */ + +void sm_V(struct semaphore *sm) +{ + up(sm); +} /* end of sm_V */ + + +/*======================================================================*/ +/* */ +/* REAL-TIME CLOCK FUNCTIONS */ +/* */ +/*======================================================================*/ + +extern struct timezone sys_tz; + +/* + * The epoch of FAT timestamp is 1980. + * : bits : value + * date: 0 - 4: day (1 - 31) + * date: 5 - 8: month (1 - 12) + * date: 9 - 15: year (0 - 127) from 1980 + * time: 0 - 4: sec (0 - 29) 2sec counts + * time: 5 - 10: min (0 - 59) + * time: 11 - 15: hour (0 - 23) + */ +#define UNIX_SECS_1980 315532800L + +#if BITS_PER_LONG == 64 +#define UNIX_SECS_2108 4354819200L +#endif +/* days between 1.1.70 and 1.1.80 (2 leap days) */ +#define DAYS_DELTA_DECADE (365 * 10 + 2) +/* 120 (2100 - 1980) isn't leap year */ +#define NO_LEAP_YEAR_2100 (120) +#define IS_LEAP_YEAR(y) (!((y) & 3) && (y) != NO_LEAP_YEAR_2100) + +#define SECS_PER_MIN (60) +#define SECS_PER_HOUR (60 * SECS_PER_MIN) +#define SECS_PER_DAY (24 * SECS_PER_HOUR) + +#define MAKE_LEAP_YEAR(leap_year, year) \ + do { \ + if (unlikely(year > NO_LEAP_YEAR_2100)) \ + leap_year = ((year + 3) / 4) - 1; \ + else \ + leap_year = ((year + 3) / 4); \ + } while (0) + +/* Linear day numbers of the respective 1sts in non-leap years. */ +static time_t accum_days_in_year[] = { + /* Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec */ + 0, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 0, 0, 0, +}; + +TIMESTAMP_T *tm_current(TIMESTAMP_T *tp) +{ + struct timespec ts; + time_t second, day, leap_day, month, year; + +#if LINUX_VERSION_CODE < KERNEL_VERSION(4,8,0) + ts = CURRENT_TIME_SEC; +#else + ktime_get_real_ts(&ts); +#endif + + second = ts.tv_sec; + second -= sys_tz.tz_minuteswest * SECS_PER_MIN; + + /* Jan 1 GMT 00:00:00 1980. But what about another time zone? */ + if (second < UNIX_SECS_1980) { + tp->sec = 0; + tp->min = 0; + tp->hour = 0; + tp->day = 1; + tp->mon = 1; + tp->year = 0; + return tp; + } +#if BITS_PER_LONG == 64 + if (second >= UNIX_SECS_2108) { + tp->sec = 59; + tp->min = 59; + tp->hour = 23; + tp->day = 31; + tp->mon = 12; + tp->year = 127; + return tp; + } +#endif + + day = second / SECS_PER_DAY - DAYS_DELTA_DECADE; + year = day / 365; + + MAKE_LEAP_YEAR(leap_day, year); + if (year * 365 + leap_day > day) + year--; + + MAKE_LEAP_YEAR(leap_day, year); + + day -= year * 365 + leap_day; + + if (IS_LEAP_YEAR(year) && day == accum_days_in_year[3]) { + month = 2; + } else { + if (IS_LEAP_YEAR(year) && day > accum_days_in_year[3]) + day--; + for (month = 1; month < 12; month++) { + if (accum_days_in_year[month + 1] > day) + break; + } + } + day -= accum_days_in_year[month]; + + tp->sec = second % SECS_PER_MIN; + tp->min = (second / SECS_PER_MIN) % 60; + tp->hour = (second / SECS_PER_HOUR) % 24; + tp->day = day + 1; + tp->mon = month; + tp->year = year; + + return tp; +} /* end of tm_current */ diff --git a/fs/exfat/exfat_oal.h b/fs/exfat/exfat_oal.h new file mode 100644 index 0000000000000000..b6dd7897ab6e2f3f --- /dev/null +++ b/fs/exfat/exfat_oal.h @@ -0,0 +1,74 @@ +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +/************************************************************************/ +/* */ +/* PROJECT : exFAT & FAT12/16/32 File System */ +/* FILE : exfat_oal.h */ +/* PURPOSE : Header File for exFAT OS Adaptation Layer */ +/* (Semaphore Functions & Real-Time Clock Functions) */ +/* */ +/*----------------------------------------------------------------------*/ +/* NOTES */ +/* */ +/*----------------------------------------------------------------------*/ +/* REVISION HISTORY (Ver 0.9) */ +/* */ +/* - 2010.11.15 [Joosun Hahn] : first writing */ +/* */ +/************************************************************************/ + +#ifndef _EXFAT_OAL_H +#define _EXFAT_OAL_H + +#include +#include "exfat_config.h" +#include + +/*----------------------------------------------------------------------*/ +/* Constant & Macro Definitions (Configurable) */ +/*----------------------------------------------------------------------*/ + +/*----------------------------------------------------------------------*/ +/* Constant & Macro Definitions (Non-Configurable) */ +/*----------------------------------------------------------------------*/ + +/*----------------------------------------------------------------------*/ +/* Type Definitions */ +/*----------------------------------------------------------------------*/ + +typedef struct { + u16 sec; /* 0 ~ 59 */ + u16 min; /* 0 ~ 59 */ + u16 hour; /* 0 ~ 23 */ + u16 day; /* 1 ~ 31 */ + u16 mon; /* 1 ~ 12 */ + u16 year; /* 0 ~ 127 (since 1980) */ +} TIMESTAMP_T; + +/*----------------------------------------------------------------------*/ +/* External Function Declarations */ +/*----------------------------------------------------------------------*/ + +s32 sm_init(struct semaphore *sm); +s32 sm_P(struct semaphore *sm); +void sm_V(struct semaphore *sm); + +TIMESTAMP_T *tm_current(TIMESTAMP_T *tm); + +#endif /* _EXFAT_OAL_H */ diff --git a/fs/exfat/exfat_super.c b/fs/exfat/exfat_super.c new file mode 100644 index 0000000000000000..104ec4455fcc0caa --- /dev/null +++ b/fs/exfat/exfat_super.c @@ -0,0 +1,2697 @@ +/* Some of the source code in this file came from "linux/fs/fat/file.c","linux/fs/fat/inode.c" and "linux/fs/fat/misc.c". */ +/* + * linux/fs/fat/file.c + * + * Written 1992,1993 by Werner Almesberger + * + * regular file handling primitives for fat-based filesystems + */ + +/* + * linux/fs/fat/inode.c + * + * Written 1992,1993 by Werner Almesberger + * VFAT extensions by Gordon Chaffee, merged with msdos fs by Henrik Storner + * Rewritten for the constant inumbers support by Al Viro + * + * Fixes: + * + * Max Cohan: Fixed invalid FSINFO offset when info_sector is 0 + */ + +/* + * linux/fs/fat/misc.c + * + * Written 1992,1993 by Werner Almesberger + * 22/11/2000 - Fixed fat_date_unix2dos for dates earlier than 01/01/1980 + * and date_dos2unix for date==0 by Igor Zhbanov(bsg@uniyar.ac.ru) + */ + +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +#include +#include +#include +#include +#include +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37) +#include +#endif +#include +#include +#include +#include +#include +#include +#include +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0) +#include +#endif +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "exfat_version.h" +#include "exfat_config.h" +#include "exfat_data.h" +#include "exfat_oal.h" + +#include "exfat_blkdev.h" +#include "exfat_cache.h" +#include "exfat_nls.h" +#include "exfat_api.h" +#include "exfat_core.h" + +#include "exfat_super.h" + +static struct kmem_cache *exfat_inode_cachep; + +static int exfat_default_codepage = CONFIG_EXFAT_DEFAULT_CODEPAGE; +static char exfat_default_iocharset[] = CONFIG_EXFAT_DEFAULT_IOCHARSET; + +extern struct timezone sys_tz; + +#if LINUX_VERSION_CODE < KERNEL_VERSION(4,8,0) +#define current_time(x) (CURRENT_TIME_SEC) +#endif + +#define CHECK_ERR(x) BUG_ON(x) + +#define UNIX_SECS_1980 315532800L + +#if BITS_PER_LONG == 64 +#define UNIX_SECS_2108 4354819200L +#endif +/* days between 1.1.70 and 1.1.80 (2 leap days) */ +#define DAYS_DELTA_DECADE (365 * 10 + 2) +/* 120 (2100 - 1980) isn't leap year */ +#define NO_LEAP_YEAR_2100 (120) +#define IS_LEAP_YEAR(y) (!((y) & 0x3) && (y) != NO_LEAP_YEAR_2100) + +#define SECS_PER_MIN (60) +#define SECS_PER_HOUR (60 * SECS_PER_MIN) +#define SECS_PER_DAY (24 * SECS_PER_HOUR) + +#define MAKE_LEAP_YEAR(leap_year, year) \ + do { \ + if (unlikely(year > NO_LEAP_YEAR_2100)) \ + leap_year = ((year + 3) / 4) - 1; \ + else \ + leap_year = ((year + 3) / 4); \ + } while (0) + +/* Linear day numbers of the respective 1sts in non-leap years. */ +static time_t accum_days_in_year[] = { + /* Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec */ + 0, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 0, 0, 0, +}; + +static void _exfat_truncate(struct inode *inode, loff_t old_size); + +/* Convert a FAT time/date pair to a UNIX date (seconds since 1 1 70). */ +void exfat_time_fat2unix(struct exfat_sb_info *sbi, struct timespec *ts, + DATE_TIME_T *tp) +{ + time_t year = tp->Year; + time_t ld; + + MAKE_LEAP_YEAR(ld, year); + + if (IS_LEAP_YEAR(year) && (tp->Month) > 2) + ld++; + + ts->tv_sec = tp->Second + tp->Minute * SECS_PER_MIN + + tp->Hour * SECS_PER_HOUR + + (year * 365 + ld + accum_days_in_year[(tp->Month)] + (tp->Day - 1) + DAYS_DELTA_DECADE) * SECS_PER_DAY + + sys_tz.tz_minuteswest * SECS_PER_MIN; + ts->tv_nsec = 0; +} + +/* Convert linear UNIX date to a FAT time/date pair. */ +void exfat_time_unix2fat(struct exfat_sb_info *sbi, struct timespec *ts, + DATE_TIME_T *tp) +{ + time_t second = ts->tv_sec; + time_t day, month, year; + time_t ld; + + second -= sys_tz.tz_minuteswest * SECS_PER_MIN; + + /* Jan 1 GMT 00:00:00 1980. But what about another time zone? */ + if (second < UNIX_SECS_1980) { + tp->Second = 0; + tp->Minute = 0; + tp->Hour = 0; + tp->Day = 1; + tp->Month = 1; + tp->Year = 0; + return; + } +#if (BITS_PER_LONG == 64) + if (second >= UNIX_SECS_2108) { + tp->Second = 59; + tp->Minute = 59; + tp->Hour = 23; + tp->Day = 31; + tp->Month = 12; + tp->Year = 127; + return; + } +#endif + day = second / SECS_PER_DAY - DAYS_DELTA_DECADE; + year = day / 365; + MAKE_LEAP_YEAR(ld, year); + if (year * 365 + ld > day) + year--; + + MAKE_LEAP_YEAR(ld, year); + day -= year * 365 + ld; + + if (IS_LEAP_YEAR(year) && day == accum_days_in_year[3]) { + month = 2; + } else { + if (IS_LEAP_YEAR(year) && day > accum_days_in_year[3]) + day--; + for (month = 1; month < 12; month++) { + if (accum_days_in_year[month + 1] > day) + break; + } + } + day -= accum_days_in_year[month]; + + tp->Second = second % SECS_PER_MIN; + tp->Minute = (second / SECS_PER_MIN) % 60; + tp->Hour = (second / SECS_PER_HOUR) % 24; + tp->Day = day + 1; + tp->Month = month; + tp->Year = year; +} + +static struct inode *exfat_iget(struct super_block *sb, loff_t i_pos); +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) +static int exfat_generic_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg); +#else +static long exfat_generic_ioctl(struct file *filp, unsigned int cmd, unsigned long arg); +#endif +static int exfat_sync_inode(struct inode *inode); +static struct inode *exfat_build_inode(struct super_block *sb, FILE_ID_T *fid, loff_t i_pos); +static void exfat_detach(struct inode *inode); +static void exfat_attach(struct inode *inode, loff_t i_pos); +static inline unsigned long exfat_hash(loff_t i_pos); +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,34) +static int exfat_write_inode(struct inode *inode, int wait); +#else +static int exfat_write_inode(struct inode *inode, struct writeback_control *wbc); +#endif +static void exfat_write_super(struct super_block *sb); + +static void __lock_super(struct super_block *sb) +{ +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0) + lock_super(sb); +#else + struct exfat_sb_info *sbi = EXFAT_SB(sb); + mutex_lock(&sbi->s_lock); +#endif +} + +static void __unlock_super(struct super_block *sb) +{ +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0) + unlock_super(sb); +#else + struct exfat_sb_info *sbi = EXFAT_SB(sb); + mutex_unlock(&sbi->s_lock); +#endif +} + +static int __is_sb_dirty(struct super_block *sb) +{ +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0) + return sb->s_dirt; +#else + struct exfat_sb_info *sbi = EXFAT_SB(sb); + return sbi->s_dirt; +#endif +} + +static void __set_sb_clean(struct super_block *sb) +{ +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0) + sb->s_dirt = 0; +#else + struct exfat_sb_info *sbi = EXFAT_SB(sb); + sbi->s_dirt = 0; +#endif +} + +static int __exfat_revalidate(struct dentry *dentry) +{ + return 0; +} + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,00) +static int exfat_revalidate(struct dentry *dentry, unsigned int flags) +#else +static int exfat_revalidate(struct dentry *dentry, struct nameidata *nd) +#endif +{ +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,00) + if (flags & LOOKUP_RCU) + return -ECHILD; +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,0,00) + if (nd && nd->flags & LOOKUP_RCU) + return -ECHILD; +#endif + + if (dentry->d_inode) + return 1; + return __exfat_revalidate(dentry); +} + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,00) +static int exfat_revalidate_ci(struct dentry *dentry, unsigned int flags) +#else +static int exfat_revalidate_ci(struct dentry *dentry, struct nameidata *nd) +#endif +{ +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,00) + if (flags & LOOKUP_RCU) + return -ECHILD; +#else + unsigned int flags; + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,0,00) + if (nd && nd->flags & LOOKUP_RCU) + return -ECHILD; +#endif + + flags = nd ? nd->flags : 0; +#endif + + if (dentry->d_inode) + return 1; + + if (!flags) + return 0; + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,0,00) + if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) + return 0; +#else + if (!(nd->flags & (LOOKUP_CONTINUE | LOOKUP_PARENT))) { + if (nd->flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) + return 0; + } +#endif + + return __exfat_revalidate(dentry); +} + +static unsigned int __exfat_striptail_len(unsigned int len, const char *name) +{ + while (len && name[len - 1] == '.') + len--; + return len; +} + +static unsigned int exfat_striptail_len(const struct qstr *qstr) +{ + return __exfat_striptail_len(qstr->len, qstr->name); +} + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) +static int exfat_d_hash(const struct dentry *dentry, struct qstr *qstr) +#elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) +static int exfat_d_hash(struct dentry *dentry, struct qstr *qstr) +#else +static int exfat_d_hash(const struct dentry *dentry, const struct inode *inode, + struct qstr *qstr) +#endif +{ +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,8,0) + qstr->hash = full_name_hash(dentry, qstr->name, exfat_striptail_len(qstr)); +#else + qstr->hash = full_name_hash(qstr->name, exfat_striptail_len(qstr)); +#endif + return 0; +} + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) +static int exfat_d_hashi(const struct dentry *dentry, struct qstr *qstr) +#elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) +static int exfat_d_hashi(struct dentry *dentry, struct qstr *qstr) +#else +static int exfat_d_hashi(const struct dentry *dentry, const struct inode *inode, + struct qstr *qstr) +#endif +{ + struct super_block *sb = dentry->d_sb; + const unsigned char *name; + unsigned int len; + unsigned long hash; + + name = qstr->name; + len = exfat_striptail_len(qstr); + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,8,0) + hash = init_name_hash(dentry); +#else + hash = init_name_hash(); +#endif + while (len--) + hash = partial_name_hash(nls_upper(sb, *name++), hash); + qstr->hash = end_name_hash(hash); + + return 0; +} + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,8,0) +static int exfat_cmpi(const struct dentry *dentry, + unsigned int len, const char *str, const struct qstr *name) +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) +static int exfat_cmpi(const struct dentry *parent, const struct dentry *dentry, + unsigned int len, const char *str, const struct qstr *name) +#elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) +static int exfat_cmpi(struct dentry *parent, struct qstr *a, struct qstr *b) +#else +static int exfat_cmpi(const struct dentry *parent, const struct inode *pinode, + const struct dentry *dentry, const struct inode *inode, + unsigned int len, const char *str, const struct qstr *name) +#endif +{ +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,8,0) + struct nls_table *t = EXFAT_SB(dentry->d_sb)->nls_io; +#else + struct nls_table *t = EXFAT_SB(parent->d_sb)->nls_io; +#endif + unsigned int alen, blen; + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) + alen = exfat_striptail_len(a); + blen = exfat_striptail_len(b); +#else + alen = exfat_striptail_len(name); + blen = __exfat_striptail_len(len, str); +#endif + if (alen == blen) { + if (t == NULL) { +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) + if (strncasecmp(a->name, b->name, alen) == 0) +#else + if (strncasecmp(name->name, str, alen) == 0) +#endif + return 0; +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) + } else if (nls_strnicmp(t, a->name, b->name, alen) == 0) +#else + } else if (nls_strnicmp(t, name->name, str, alen) == 0) +#endif + return 0; + } + return 1; +} +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,8,0) +static int exfat_cmp(const struct dentry *dentry, + unsigned int len, const char *str, const struct qstr *name) +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) +static int exfat_cmp(const struct dentry *parent, const struct dentry *dentry, + unsigned int len, const char *str, const struct qstr *name) +#elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) +static int exfat_cmp(struct dentry *parent, struct qstr *a, + struct qstr *b) +#else +static int exfat_cmp(const struct dentry *parent, const struct inode *pinode, + const struct dentry *dentry, const struct inode *inode, + unsigned int len, const char *str, const struct qstr *name) +#endif +{ + unsigned int alen, blen; + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) + alen = exfat_striptail_len(a); + blen = exfat_striptail_len(b); +#else + alen = exfat_striptail_len(name); + blen = __exfat_striptail_len(len, str); +#endif + if (alen == blen) { +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) + if (strncmp(a->name, b->name, alen) == 0) +#else + if (strncmp(name->name, str, alen) == 0) +#endif + return 0; + } + return 1; +} + +static const struct dentry_operations exfat_ci_dentry_ops = { + .d_revalidate = exfat_revalidate_ci, + .d_hash = exfat_d_hashi, + .d_compare = exfat_cmpi, +}; + +static const struct dentry_operations exfat_dentry_ops = { + .d_revalidate = exfat_revalidate, + .d_hash = exfat_d_hash, + .d_compare = exfat_cmp, +}; + +/*======================================================================*/ +/* Directory Entry Operations */ +/*======================================================================*/ + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) +static int exfat_readdir(struct file *filp, struct dir_context *ctx) +#else +static int exfat_readdir(struct file *filp, void *dirent, filldir_t filldir) +#endif +{ +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,9,0) + struct inode *inode = file_inode(filp); +#else + struct inode *inode = filp->f_path.dentry->d_inode; +#endif + struct super_block *sb = inode->i_sb; + struct exfat_sb_info *sbi = EXFAT_SB(sb); + FS_INFO_T *p_fs = &(sbi->fs_info); + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + DIR_ENTRY_T de; + unsigned long inum; + loff_t cpos; + int err = 0; + + __lock_super(sb); + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) + cpos = ctx->pos; +#else + cpos = filp->f_pos; +#endif + /* Fake . and .. for the root directory. */ + if ((p_fs->vol_type == EXFAT) || (inode->i_ino == EXFAT_ROOT_INO)) { + while (cpos < 2) { + if (inode->i_ino == EXFAT_ROOT_INO) + inum = EXFAT_ROOT_INO; + else if (cpos == 0) + inum = inode->i_ino; + else /* (cpos == 1) */ + inum = parent_ino(filp->f_path.dentry); + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) + if (!dir_emit_dots(filp, ctx)) +#else + if (filldir(dirent, "..", cpos+1, cpos, inum, DT_DIR) < 0) +#endif + goto out; + cpos++; +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) + ctx->pos++; +#else + filp->f_pos++; +#endif + } + if (cpos == 2) + cpos = 0; + } + if (cpos & (DENTRY_SIZE - 1)) { + err = -ENOENT; + goto out; + } + +get_new: + EXFAT_I(inode)->fid.size = i_size_read(inode); + EXFAT_I(inode)->fid.rwoffset = cpos >> DENTRY_SIZE_BITS; + + err = FsReadDir(inode, &de); + if (err) { + /* at least we tried to read a sector + * move cpos to next sector position (should be aligned) + */ + if (err == FFS_MEDIAERR) { + cpos += 1 << p_bd->sector_size_bits; + cpos &= ~((1 << p_bd->sector_size_bits)-1); + } + + err = -EIO; + goto end_of_dir; + } + + cpos = EXFAT_I(inode)->fid.rwoffset << DENTRY_SIZE_BITS; + + if (!de.Name[0]) + goto end_of_dir; + + if (!memcmp(de.ShortName, DOS_CUR_DIR_NAME, DOS_NAME_LENGTH)) { + inum = inode->i_ino; + } else if (!memcmp(de.ShortName, DOS_PAR_DIR_NAME, DOS_NAME_LENGTH)) { + inum = parent_ino(filp->f_path.dentry); + } else { + loff_t i_pos = ((loff_t) EXFAT_I(inode)->fid.start_clu << 32) | + ((EXFAT_I(inode)->fid.rwoffset-1) & 0xffffffff); + + struct inode *tmp = exfat_iget(sb, i_pos); + if (tmp) { + inum = tmp->i_ino; + iput(tmp); + } else { + inum = iunique(sb, EXFAT_ROOT_INO); + } + } + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) + if (!dir_emit(ctx, de.Name, strlen(de.Name), inum, + (de.Attr & ATTR_SUBDIR) ? DT_DIR : DT_REG)) +#else + if (filldir(dirent, de.Name, strlen(de.Name), cpos-1, inum, + (de.Attr & ATTR_SUBDIR) ? DT_DIR : DT_REG) < 0) +#endif + goto out; + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) + ctx->pos = cpos; +#else + filp->f_pos = cpos; +#endif + goto get_new; + +end_of_dir: +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) + ctx->pos = cpos; +#else + filp->f_pos = cpos; +#endif +out: + __unlock_super(sb); + return err; +} + +static int exfat_ioctl_volume_id(struct inode *dir) +{ + struct super_block *sb = dir->i_sb; + struct exfat_sb_info *sbi = EXFAT_SB(sb); + FS_INFO_T *p_fs = &(sbi->fs_info); + + return p_fs->vol_id; +} + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) +static int exfat_generic_ioctl(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) +#else +static long exfat_generic_ioctl(struct file *filp, + unsigned int cmd, unsigned long arg) +#endif +{ +#if !(LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)) + #if !(LINUX_VERSION_CODE < KERNEL_VERSION(3,18,3)) + struct inode *inode = filp->f_path.dentry->d_inode; + #else + struct inode *inode = filp->f_dentry->d_inode; + #endif +#endif +#ifdef CONFIG_EXFAT_KERNEL_DEBUG + unsigned int flags; +#endif /* CONFIG_EXFAT_KERNEL_DEBUG */ + + switch (cmd) { + case EXFAT_IOCTL_GET_VOLUME_ID: + return exfat_ioctl_volume_id(inode); +#ifdef CONFIG_EXFAT_KERNEL_DEBUG + case EXFAT_IOC_GET_DEBUGFLAGS: { + struct super_block *sb = inode->i_sb; + struct exfat_sb_info *sbi = EXFAT_SB(sb); + + flags = sbi->debug_flags; + return put_user(flags, (int __user *)arg); + } + case EXFAT_IOC_SET_DEBUGFLAGS: { + struct super_block *sb = inode->i_sb; + struct exfat_sb_info *sbi = EXFAT_SB(sb); + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (get_user(flags, (int __user *) arg)) + return -EFAULT; + + __lock_super(sb); + sbi->debug_flags = flags; + __unlock_super(sb); + + return 0; + } +#endif /* CONFIG_EXFAT_KERNEL_DEBUG */ + default: + return -ENOTTY; /* Inappropriate ioctl for device */ + } +} + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35) +static int exfat_file_fsync(struct file *filp, struct dentry *dentry, + int datasync) +#else +static int exfat_file_fsync(struct file *filp, int datasync) +#endif +{ + struct inode *inode = filp->f_mapping->host; + struct super_block *sb = inode->i_sb; + int res, err; + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35) + res = simple_fsync(filp, dentry, datasync); +#else + res = generic_file_fsync(filp, datasync); +#endif + err = FsSyncVol(sb, 1); + + return res ? res : err; +} +#endif + +const struct file_operations exfat_dir_operations = { + .llseek = generic_file_llseek, + .read = generic_read_dir, +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) + .iterate = exfat_readdir, +#else + .readdir = exfat_readdir, +#endif +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) + .ioctl = exfat_generic_ioctl, + .fsync = exfat_file_fsync, +#else + .unlocked_ioctl = exfat_generic_ioctl, + .fsync = generic_file_fsync, +#endif +}; + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,00) +static int exfat_create(struct inode *dir, struct dentry *dentry, umode_t mode, + bool excl) +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0) +static int exfat_create(struct inode *dir, struct dentry *dentry, umode_t mode, + struct nameidata *nd) +#else +static int exfat_create(struct inode *dir, struct dentry *dentry, int mode, + struct nameidata *nd) +#endif +{ + struct super_block *sb = dir->i_sb; + struct inode *inode; + FILE_ID_T fid; + loff_t i_pos; + int err; + + __lock_super(sb); + + DPRINTK("exfat_create entered\n"); + + err = FsCreateFile(dir, (u8 *) dentry->d_name.name, FM_REGULAR, &fid); + if (err) { + if (err == FFS_INVALIDPATH) + err = -EINVAL; + else if (err == FFS_FILEEXIST) + err = -EEXIST; + else if (err == FFS_FULL) + err = -ENOSPC; + else if (err == FFS_NAMETOOLONG) + err = -ENAMETOOLONG; + else + err = -EIO; + goto out; + } + dir->i_version++; + dir->i_ctime = dir->i_mtime = dir->i_atime = current_time(dir); + if (IS_DIRSYNC(dir)) + (void) exfat_sync_inode(dir); + else + mark_inode_dirty(dir); + + i_pos = ((loff_t) fid.dir.dir << 32) | (fid.entry & 0xffffffff); + + inode = exfat_build_inode(sb, &fid, i_pos); + if (IS_ERR(inode)) { + err = PTR_ERR(inode); + goto out; + } + inode->i_version++; + inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); + /* timestamp is already written, so mark_inode_dirty() is unnecessary. */ + + dentry->d_time = dentry->d_parent->d_inode->i_version; + d_instantiate(dentry, inode); + +out: + __unlock_super(sb); + DPRINTK("exfat_create exited\n"); + return err; +} + +static int exfat_find(struct inode *dir, struct qstr *qname, + FILE_ID_T *fid) +{ + int err; + + if (qname->len == 0) + return -ENOENT; + + err = FsLookupFile(dir, (u8 *) qname->name, fid); + if (err) + return -ENOENT; + + return 0; +} + +static int exfat_d_anon_disconn(struct dentry *dentry) +{ + return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED); +} + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,00) +static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry, + unsigned int flags) +#else +static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry, + struct nameidata *nd) +#endif +{ + struct super_block *sb = dir->i_sb; + struct inode *inode; + struct dentry *alias; + int err; + FILE_ID_T fid; + loff_t i_pos; + u64 ret; + mode_t i_mode; + + __lock_super(sb); + DPRINTK("exfat_lookup entered\n"); + err = exfat_find(dir, &dentry->d_name, &fid); + if (err) { + if (err == -ENOENT) { + inode = NULL; + goto out; + } + goto error; + } + + i_pos = ((loff_t) fid.dir.dir << 32) | (fid.entry & 0xffffffff); + inode = exfat_build_inode(sb, &fid, i_pos); + if (IS_ERR(inode)) { + err = PTR_ERR(inode); + goto error; + } + + i_mode = inode->i_mode; + if (S_ISLNK(i_mode) && !EXFAT_I(inode)->target) { + EXFAT_I(inode)->target = kmalloc(i_size_read(inode)+1, GFP_KERNEL); + if (!EXFAT_I(inode)->target) { + err = -ENOMEM; + goto error; + } + FsReadFile(dir, &fid, EXFAT_I(inode)->target, i_size_read(inode), &ret); + *(EXFAT_I(inode)->target + i_size_read(inode)) = '\0'; + } + + alias = d_find_alias(inode); + if (alias && !exfat_d_anon_disconn(alias)) { + CHECK_ERR(d_unhashed(alias)); + if (!S_ISDIR(i_mode)) + d_move(alias, dentry); + iput(inode); + __unlock_super(sb); + DPRINTK("exfat_lookup exited 1\n"); + return alias; + } else { + dput(alias); + } +out: + __unlock_super(sb); + dentry->d_time = dentry->d_parent->d_inode->i_version; +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) + dentry->d_op = sb->s_root->d_op; + dentry = d_splice_alias(inode, dentry); + if (dentry) { + dentry->d_op = sb->s_root->d_op; + dentry->d_time = dentry->d_parent->d_inode->i_version; + } +#else + dentry = d_splice_alias(inode, dentry); + if (dentry) + dentry->d_time = dentry->d_parent->d_inode->i_version; +#endif + DPRINTK("exfat_lookup exited 2\n"); + return dentry; + +error: + __unlock_super(sb); + DPRINTK("exfat_lookup exited 3\n"); + return ERR_PTR(err); +} + +static int exfat_unlink(struct inode *dir, struct dentry *dentry) +{ + struct inode *inode = dentry->d_inode; + struct super_block *sb = dir->i_sb; + int err; + + __lock_super(sb); + + DPRINTK("exfat_unlink entered\n"); + + EXFAT_I(inode)->fid.size = i_size_read(inode); + + err = FsRemoveFile(dir, &(EXFAT_I(inode)->fid)); + if (err) { + if (err == FFS_PERMISSIONERR) + err = -EPERM; + else + err = -EIO; + goto out; + } + dir->i_version++; + dir->i_mtime = dir->i_atime = current_time(dir); + if (IS_DIRSYNC(dir)) + (void) exfat_sync_inode(dir); + else + mark_inode_dirty(dir); + + clear_nlink(inode); + inode->i_mtime = inode->i_atime = current_time(inode); + exfat_detach(inode); + remove_inode_hash(inode); + +out: + __unlock_super(sb); + DPRINTK("exfat_unlink exited\n"); + return err; +} + +static int exfat_symlink(struct inode *dir, struct dentry *dentry, const char *target) +{ + struct super_block *sb = dir->i_sb; + struct inode *inode; + FILE_ID_T fid; + loff_t i_pos; + int err; + u64 len = (u64) strlen(target); + u64 ret; + + __lock_super(sb); + + DPRINTK("exfat_symlink entered\n"); + + err = FsCreateFile(dir, (u8 *) dentry->d_name.name, FM_SYMLINK, &fid); + if (err) { + if (err == FFS_INVALIDPATH) + err = -EINVAL; + else if (err == FFS_FILEEXIST) + err = -EEXIST; + else if (err == FFS_FULL) + err = -ENOSPC; + else + err = -EIO; + goto out; + } + + err = FsWriteFile(dir, &fid, (char *) target, len, &ret); + + if (err) { + FsRemoveFile(dir, &fid); + + if (err == FFS_FULL) + err = -ENOSPC; + else + err = -EIO; + goto out; + } + + dir->i_version++; + dir->i_ctime = dir->i_mtime = dir->i_atime = current_time(dir); + if (IS_DIRSYNC(dir)) + (void) exfat_sync_inode(dir); + else + mark_inode_dirty(dir); + + i_pos = ((loff_t) fid.dir.dir << 32) | (fid.entry & 0xffffffff); + + inode = exfat_build_inode(sb, &fid, i_pos); + if (IS_ERR(inode)) { + err = PTR_ERR(inode); + goto out; + } + inode->i_version++; + inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); + /* timestamp is already written, so mark_inode_dirty() is unneeded. */ + + EXFAT_I(inode)->target = kmalloc(len+1, GFP_KERNEL); + if (!EXFAT_I(inode)->target) { + err = -ENOMEM; + goto out; + } + memcpy(EXFAT_I(inode)->target, target, len+1); + + dentry->d_time = dentry->d_parent->d_inode->i_version; + d_instantiate(dentry, inode); + +out: + __unlock_super(sb); + DPRINTK("exfat_symlink exited\n"); + return err; +} + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0) +static int exfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) +#else +static int exfat_mkdir(struct inode *dir, struct dentry *dentry, int mode) +#endif +{ + struct super_block *sb = dir->i_sb; + struct inode *inode; + FILE_ID_T fid; + loff_t i_pos; + int err; + + __lock_super(sb); + + DPRINTK("exfat_mkdir entered\n"); + + err = FsCreateDir(dir, (u8 *) dentry->d_name.name, &fid); + if (err) { + if (err == FFS_INVALIDPATH) + err = -EINVAL; + else if (err == FFS_FILEEXIST) + err = -EEXIST; + else if (err == FFS_FULL) + err = -ENOSPC; + else if (err == FFS_NAMETOOLONG) + err = -ENAMETOOLONG; + else + err = -EIO; + goto out; + } + dir->i_version++; + dir->i_ctime = dir->i_mtime = dir->i_atime = current_time(dir); + if (IS_DIRSYNC(dir)) + (void) exfat_sync_inode(dir); + else + mark_inode_dirty(dir); + inc_nlink(dir); + + i_pos = ((loff_t) fid.dir.dir << 32) | (fid.entry & 0xffffffff); + + inode = exfat_build_inode(sb, &fid, i_pos); + if (IS_ERR(inode)) { + err = PTR_ERR(inode); + goto out; + } + inode->i_version++; + inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); + /* timestamp is already written, so mark_inode_dirty() is unneeded. */ + + dentry->d_time = dentry->d_parent->d_inode->i_version; + d_instantiate(dentry, inode); + +out: + __unlock_super(sb); + DPRINTK("exfat_mkdir exited\n"); + return err; +} + +static int exfat_rmdir(struct inode *dir, struct dentry *dentry) +{ + struct inode *inode = dentry->d_inode; + struct super_block *sb = dir->i_sb; + int err; + + __lock_super(sb); + + DPRINTK("exfat_rmdir entered\n"); + + EXFAT_I(inode)->fid.size = i_size_read(inode); + + err = FsRemoveDir(dir, &(EXFAT_I(inode)->fid)); + if (err) { + if (err == FFS_INVALIDPATH) + err = -EINVAL; + else if (err == FFS_FILEEXIST) + err = -ENOTEMPTY; + else if (err == FFS_NOTFOUND) + err = -ENOENT; + else if (err == FFS_DIRBUSY) + err = -EBUSY; + else + err = -EIO; + goto out; + } + dir->i_version++; + dir->i_mtime = dir->i_atime = current_time(dir); + if (IS_DIRSYNC(dir)) + (void) exfat_sync_inode(dir); + else + mark_inode_dirty(dir); + drop_nlink(dir); + + clear_nlink(inode); + inode->i_mtime = inode->i_atime = current_time(inode); + exfat_detach(inode); + remove_inode_hash(inode); + +out: + __unlock_super(sb); + DPRINTK("exfat_rmdir exited\n"); + return err; +} + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,9,0) +static int exfat_rename(struct inode *old_dir, struct dentry *old_dentry, + struct inode *new_dir, struct dentry *new_dentry, + unsigned int flags) +#else +static int exfat_rename(struct inode *old_dir, struct dentry *old_dentry, + struct inode *new_dir, struct dentry *new_dentry) +#endif +{ + struct inode *old_inode, *new_inode; + struct super_block *sb = old_dir->i_sb; + loff_t i_pos; + int err; + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,9,0) + if (flags) + return -EINVAL; +#endif + + __lock_super(sb); + + DPRINTK("exfat_rename entered\n"); + + old_inode = old_dentry->d_inode; + new_inode = new_dentry->d_inode; + + EXFAT_I(old_inode)->fid.size = i_size_read(old_inode); + + err = FsMoveFile(old_dir, &(EXFAT_I(old_inode)->fid), new_dir, new_dentry); + if (err) { + if (err == FFS_PERMISSIONERR) + err = -EPERM; + else if (err == FFS_INVALIDPATH) + err = -EINVAL; + else if (err == FFS_FILEEXIST) + err = -EEXIST; + else if (err == FFS_NOTFOUND) + err = -ENOENT; + else if (err == FFS_FULL) + err = -ENOSPC; + else + err = -EIO; + goto out; + } + new_dir->i_version++; + new_dir->i_ctime = new_dir->i_mtime = new_dir->i_atime = current_time(new_dir); + if (IS_DIRSYNC(new_dir)) + (void) exfat_sync_inode(new_dir); + else + mark_inode_dirty(new_dir); + + i_pos = ((loff_t) EXFAT_I(old_inode)->fid.dir.dir << 32) | + (EXFAT_I(old_inode)->fid.entry & 0xffffffff); + + exfat_detach(old_inode); + exfat_attach(old_inode, i_pos); + if (IS_DIRSYNC(new_dir)) + (void) exfat_sync_inode(old_inode); + else + mark_inode_dirty(old_inode); + + if ((S_ISDIR(old_inode->i_mode)) && (old_dir != new_dir)) { + drop_nlink(old_dir); + if (!new_inode) + inc_nlink(new_dir); + } + + old_dir->i_version++; + old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); + if (IS_DIRSYNC(old_dir)) + (void) exfat_sync_inode(old_dir); + else + mark_inode_dirty(old_dir); + + if (new_inode) { + exfat_detach(new_inode); + drop_nlink(new_inode); + if (S_ISDIR(new_inode->i_mode)) + drop_nlink(new_inode); + new_inode->i_ctime = current_time(new_inode); + } + +out: + __unlock_super(sb); + DPRINTK("exfat_rename exited\n"); + return err; +} + +static int exfat_cont_expand(struct inode *inode, loff_t size) +{ + struct address_space *mapping = inode->i_mapping; + loff_t start = i_size_read(inode), count = size - i_size_read(inode); + int err, err2; + + err = generic_cont_expand_simple(inode, size); + if (err != 0) + return err; + + inode->i_ctime = inode->i_mtime = current_time(inode); + mark_inode_dirty(inode); + + if (IS_SYNC(inode)) { + err = filemap_fdatawrite_range(mapping, start, start + count - 1); + err2 = sync_mapping_buffers(mapping); + err = (err) ? (err) : (err2); + err2 = write_inode_now(inode, 1); + err = (err) ? (err) : (err2); + if (!err) +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32) + err = wait_on_page_writeback_range(mapping, + start >> PAGE_CACHE_SHIFT, + (start + count - 1) >> PAGE_CACHE_SHIFT); +#else + err = filemap_fdatawait_range(mapping, start, start + count - 1); +#endif + } + return err; +} + +static int exfat_allow_set_time(struct exfat_sb_info *sbi, struct inode *inode) +{ + mode_t allow_utime = sbi->options.allow_utime; + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0) + if (!uid_eq(current_fsuid(), inode->i_uid)) +#else + if (current_fsuid() != inode->i_uid) +#endif + { + if (in_group_p(inode->i_gid)) + allow_utime >>= 3; + if (allow_utime & MAY_WRITE) + return 1; + } + + /* use a default check */ + return 0; +} + +static int exfat_sanitize_mode(const struct exfat_sb_info *sbi, + struct inode *inode, umode_t *mode_ptr) +{ + mode_t i_mode, mask, perm; + + i_mode = inode->i_mode; + + if (S_ISREG(i_mode) || S_ISLNK(i_mode)) + mask = sbi->options.fs_fmask; + else + mask = sbi->options.fs_dmask; + + perm = *mode_ptr & ~(S_IFMT | mask); + + /* Of the r and x bits, all (subject to umask) must be present.*/ + if ((perm & (S_IRUGO | S_IXUGO)) != (i_mode & (S_IRUGO|S_IXUGO))) + return -EPERM; + + if (exfat_mode_can_hold_ro(inode)) { + /* Of the w bits, either all (subject to umask) or none must be present. */ + if ((perm & S_IWUGO) && ((perm & S_IWUGO) != (S_IWUGO & ~mask))) + return -EPERM; + } else { + /* If exfat_mode_can_hold_ro(inode) is false, can't change w bits. */ + if ((perm & S_IWUGO) != (S_IWUGO & ~mask)) + return -EPERM; + } + + *mode_ptr &= S_IFMT | perm; + + return 0; +} + +static int exfat_setattr(struct dentry *dentry, struct iattr *attr) +{ + + struct exfat_sb_info *sbi = EXFAT_SB(dentry->d_sb); + struct inode *inode = dentry->d_inode; + unsigned int ia_valid; + int error; +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,35) + loff_t old_size; +#endif + + DPRINTK("exfat_setattr entered\n"); + + if ((attr->ia_valid & ATTR_SIZE) + && (attr->ia_size > i_size_read(inode))) { + error = exfat_cont_expand(inode, attr->ia_size); + if (error || attr->ia_valid == ATTR_SIZE) + return error; + attr->ia_valid &= ~ATTR_SIZE; + } + + ia_valid = attr->ia_valid; + + if ((ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)) + && exfat_allow_set_time(sbi, inode)) { + attr->ia_valid &= ~(ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET); + } + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,9,0) + error = setattr_prepare(dentry, attr); +#else + error = inode_change_ok(inode, attr); +#endif + attr->ia_valid = ia_valid; + if (error) + return error; + + if (((attr->ia_valid & ATTR_UID) && +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0) + (!uid_eq(attr->ia_uid, sbi->options.fs_uid))) || + ((attr->ia_valid & ATTR_GID) && + (!gid_eq(attr->ia_gid, sbi->options.fs_gid))) || +#else + (attr->ia_uid != sbi->options.fs_uid)) || + ((attr->ia_valid & ATTR_GID) && + (attr->ia_gid != sbi->options.fs_gid)) || +#endif + ((attr->ia_valid & ATTR_MODE) && + (attr->ia_mode & ~(S_IFREG | S_IFLNK | S_IFDIR | S_IRWXUGO)))) { + return -EPERM; + } + + /* + * We don't return -EPERM here. Yes, strange, but this is too + * old behavior. + */ + if (attr->ia_valid & ATTR_MODE) { + if (exfat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0) + attr->ia_valid &= ~ATTR_MODE; + } + + EXFAT_I(inode)->fid.size = i_size_read(inode); + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) + if (attr->ia_valid) + error = inode_setattr(inode, attr); +#else + if (attr->ia_valid & ATTR_SIZE) { + old_size = i_size_read(inode); +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,00) + down_write(&EXFAT_I(inode)->truncate_lock); + truncate_setsize(inode, attr->ia_size); + _exfat_truncate(inode, old_size); + up_write(&EXFAT_I(inode)->truncate_lock); +#else + truncate_setsize(inode, attr->ia_size); + _exfat_truncate(inode, old_size); +#endif + } + setattr_copy(inode, attr); + mark_inode_dirty(inode); +#endif + + DPRINTK("exfat_setattr exited\n"); + return error; +} + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0) +static int exfat_getattr(const struct path *path, struct kstat *stat, + u32 request_mask, unsigned int flags) +{ + struct inode *inode = path->dentry->d_inode; +#else +static int exfat_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) +{ + struct inode *inode = dentry->d_inode; +#endif + + DPRINTK("exfat_getattr entered\n"); + + generic_fillattr(inode, stat); + stat->blksize = EXFAT_SB(inode->i_sb)->fs_info.cluster_size; + + DPRINTK("exfat_getattr exited\n"); + return 0; +} + +const struct inode_operations exfat_dir_inode_operations = { + .create = exfat_create, + .lookup = exfat_lookup, + .unlink = exfat_unlink, + .symlink = exfat_symlink, + .mkdir = exfat_mkdir, + .rmdir = exfat_rmdir, + .rename = exfat_rename, + .setattr = exfat_setattr, + .getattr = exfat_getattr, +}; + +/*======================================================================*/ +/* File Operations */ +/*======================================================================*/ +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,5,0) +static const char *exfat_get_link(struct dentry *dentry, struct inode *inode, struct delayed_call *done) +{ + struct exfat_inode_info *ei = EXFAT_I(inode); + if (ei->target != NULL) { + char *cookie = ei->target; + if (cookie != NULL) { + return (char *)(ei->target); + } + } + return NULL; +} +#elif LINUX_VERSION_CODE > KERNEL_VERSION(4,1,0) +static const char *exfat_follow_link(struct dentry *dentry, void **cookie) +{ + struct exfat_inode_info *ei = EXFAT_I(dentry->d_inode); + return *cookie = (char *)(ei->target); +} +#else +static void *exfat_follow_link(struct dentry *dentry, struct nameidata *nd) +{ + struct exfat_inode_info *ei = EXFAT_I(dentry->d_inode); + nd_set_link(nd, (char *)(ei->target)); + return NULL; +} +#endif + +const struct inode_operations exfat_symlink_inode_operations = { + #if LINUX_VERSION_CODE < KERNEL_VERSION(4,10,0) + .readlink = generic_readlink, + #endif + #if LINUX_VERSION_CODE < KERNEL_VERSION(4,5,0) + .follow_link = exfat_follow_link, + #endif + #if LINUX_VERSION_CODE >= KERNEL_VERSION(4,5,0) + .get_link = exfat_get_link, + #endif +}; + +static int exfat_file_release(struct inode *inode, struct file *filp) +{ + struct super_block *sb = inode->i_sb; + + EXFAT_I(inode)->fid.size = i_size_read(inode); + FsSyncVol(sb, 0); + return 0; +} + +const struct file_operations exfat_file_operations = { + .llseek = generic_file_llseek, +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,16,0) + .read = do_sync_read, + .write = do_sync_write, + .aio_read = generic_file_aio_read, + .aio_write = generic_file_aio_write, +#elif LINUX_VERSION_CODE < KERNEL_VERSION(4,1,0) + .read = new_sync_read, + .write = new_sync_write, +#endif +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0) + .read_iter = generic_file_read_iter, + .write_iter = generic_file_write_iter, +#endif + .mmap = generic_file_mmap, + .release = exfat_file_release, +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) + .ioctl = exfat_generic_ioctl, + .fsync = exfat_file_fsync, +#else + .unlocked_ioctl = exfat_generic_ioctl, + .fsync = generic_file_fsync, +#endif + .splice_read = generic_file_splice_read, +}; + +static void _exfat_truncate(struct inode *inode, loff_t old_size) +{ + struct super_block *sb = inode->i_sb; + struct exfat_sb_info *sbi = EXFAT_SB(sb); + FS_INFO_T *p_fs = &(sbi->fs_info); + int err; + + __lock_super(sb); + + /* + * This protects against truncating a file bigger than it was then + * trying to write into the hole. + */ + if (EXFAT_I(inode)->mmu_private > i_size_read(inode)) + EXFAT_I(inode)->mmu_private = i_size_read(inode); + + if (EXFAT_I(inode)->fid.start_clu == 0) + goto out; + + err = FsTruncateFile(inode, old_size, i_size_read(inode)); + if (err) + goto out; + + inode->i_ctime = inode->i_mtime = current_time(inode); + if (IS_DIRSYNC(inode)) + (void) exfat_sync_inode(inode); + else + mark_inode_dirty(inode); + + inode->i_blocks = ((i_size_read(inode) + (p_fs->cluster_size - 1)) + & ~((loff_t)p_fs->cluster_size - 1)) >> 9; +out: + __unlock_super(sb); +} + +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,36) +static void exfat_truncate(struct inode *inode) +{ + _exfat_truncate(inode, i_size_read(inode)); +} +#endif + +const struct inode_operations exfat_file_inode_operations = { +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,36) + .truncate = exfat_truncate, +#endif + .setattr = exfat_setattr, + .getattr = exfat_getattr, +}; + +/*======================================================================*/ +/* Address Space Operations */ +/*======================================================================*/ + +static int exfat_bmap(struct inode *inode, sector_t sector, sector_t *phys, + unsigned long *mapped_blocks, int *create) +{ + struct super_block *sb = inode->i_sb; + struct exfat_sb_info *sbi = EXFAT_SB(sb); + FS_INFO_T *p_fs = &(sbi->fs_info); + BD_INFO_T *p_bd = &(sbi->bd_info); + const unsigned long blocksize = sb->s_blocksize; + const unsigned char blocksize_bits = sb->s_blocksize_bits; + sector_t last_block; + int err, clu_offset, sec_offset; + unsigned int cluster; + + *phys = 0; + *mapped_blocks = 0; + + if ((p_fs->vol_type == FAT12) || (p_fs->vol_type == FAT16)) { + if (inode->i_ino == EXFAT_ROOT_INO) { + if (sector < (p_fs->dentries_in_root >> (p_bd->sector_size_bits-DENTRY_SIZE_BITS))) { + *phys = sector + p_fs->root_start_sector; + *mapped_blocks = 1; + } + return 0; + } + } + + last_block = (i_size_read(inode) + (blocksize - 1)) >> blocksize_bits; + if (sector >= last_block) { + if (*create == 0) + return 0; + } else { + *create = 0; + } + + clu_offset = sector >> p_fs->sectors_per_clu_bits; /* cluster offset */ + sec_offset = sector & (p_fs->sectors_per_clu - 1); /* sector offset in cluster */ + + EXFAT_I(inode)->fid.size = i_size_read(inode); + + err = FsMapCluster(inode, clu_offset, &cluster); + + if (err) { + if (err == FFS_FULL) + return -ENOSPC; + else + return -EIO; + } else if (cluster != CLUSTER_32(~0)) { + *phys = START_SECTOR(cluster) + sec_offset; + *mapped_blocks = p_fs->sectors_per_clu - sec_offset; + } + + return 0; +} + +static int exfat_get_block(struct inode *inode, sector_t iblock, + struct buffer_head *bh_result, int create) +{ + struct super_block *sb = inode->i_sb; + unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; + int err; + unsigned long mapped_blocks; + sector_t phys; + + __lock_super(sb); + + err = exfat_bmap(inode, iblock, &phys, &mapped_blocks, &create); + if (err) { + __unlock_super(sb); + return err; + } + + if (phys) { + max_blocks = min(mapped_blocks, max_blocks); + if (create) { + EXFAT_I(inode)->mmu_private += max_blocks << sb->s_blocksize_bits; + set_buffer_new(bh_result); + } + map_bh(bh_result, sb, phys); + } + + bh_result->b_size = max_blocks << sb->s_blocksize_bits; + __unlock_super(sb); + + return 0; +} + +static int exfat_readpage(struct file *file, struct page *page) +{ + int ret; + ret = mpage_readpage(page, exfat_get_block); + return ret; +} + +static int exfat_readpages(struct file *file, struct address_space *mapping, + struct list_head *pages, unsigned nr_pages) +{ + int ret; + ret = mpage_readpages(mapping, pages, nr_pages, exfat_get_block); + return ret; +} + +static int exfat_writepage(struct page *page, struct writeback_control *wbc) +{ + int ret; + ret = block_write_full_page(page, exfat_get_block, wbc); + return ret; +} + +static int exfat_writepages(struct address_space *mapping, + struct writeback_control *wbc) +{ + int ret; + ret = mpage_writepages(mapping, wbc, exfat_get_block); + return ret; +} + +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,34) +static void exfat_write_failed(struct address_space *mapping, loff_t to) +{ + struct inode *inode = mapping->host; + if (to > i_size_read(inode)) { +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,12,0) + truncate_pagecache(inode, i_size_read(inode)); +#else + truncate_pagecache(inode, to, i_size_read(inode)); +#endif + EXFAT_I(inode)->fid.size = i_size_read(inode); + _exfat_truncate(inode, i_size_read(inode)); + } +} +#endif + +static int exfat_write_begin(struct file *file, struct address_space *mapping, + loff_t pos, unsigned len, unsigned flags, + struct page **pagep, void **fsdata) +{ + int ret; + *pagep = NULL; + ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, + exfat_get_block, + &EXFAT_I(mapping->host)->mmu_private); + +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,34) + if (ret < 0) + exfat_write_failed(mapping, pos+len); +#endif + return ret; +} + +static int exfat_write_end(struct file *file, struct address_space *mapping, + loff_t pos, unsigned len, unsigned copied, + struct page *pagep, void *fsdata) +{ + struct inode *inode = mapping->host; + FILE_ID_T *fid = &(EXFAT_I(inode)->fid); + int err; + + err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata); + +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,34) + if (err < len) + exfat_write_failed(mapping, pos+len); +#endif + + if (!(err < 0) && !(fid->attr & ATTR_ARCHIVE)) { + inode->i_mtime = inode->i_ctime = current_time(inode); + fid->attr |= ATTR_ARCHIVE; + mark_inode_dirty(inode); + } + return err; +} + +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,16,0) +#ifdef CONFIG_AIO_OPTIMIZATION +static ssize_t exfat_direct_IO(int rw, struct kiocb *iocb, + struct iov_iter *iter, loff_t offset) +#else +static ssize_t exfat_direct_IO(int rw, struct kiocb *iocb, + const struct iovec *iov, + loff_t offset, unsigned long nr_segs) +#endif +#elif LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0) +static ssize_t exfat_direct_IO(int rw, struct kiocb *iocb, + struct iov_iter *iter, loff_t offset) +#elif LINUX_VERSION_CODE < KERNEL_VERSION(4,7,0) +static ssize_t exfat_direct_IO(struct kiocb *iocb, + struct iov_iter *iter, loff_t offset) +#else /* >= 4.7.x */ +static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter) +#endif +{ + struct inode *inode = iocb->ki_filp->f_mapping->host; +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,34) + struct address_space *mapping = iocb->ki_filp->f_mapping; +#endif + ssize_t ret; +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,2,0) + int rw; + + rw = iov_iter_rw(iter); +#endif + + if (rw == WRITE) { +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,16,0) +#ifdef CONFIG_AIO_OPTIMIZATION + if (EXFAT_I(inode)->mmu_private < + (offset + iov_iter_count(iter))) +#else + if (EXFAT_I(inode)->mmu_private < (offset + iov_length(iov, nr_segs))) +#endif +#elif LINUX_VERSION_CODE < KERNEL_VERSION(4,7,0) + if (EXFAT_I(inode)->mmu_private < (offset + iov_iter_count(iter))) +#else + if (EXFAT_I(inode)->mmu_private < iov_iter_count(iter)) +#endif + return 0; + } +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,7,0) + ret = blockdev_direct_IO(iocb, inode, iter, exfat_get_block); +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4,1,0) + ret = blockdev_direct_IO(iocb, inode, iter, + offset, exfat_get_block); +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0) + ret = blockdev_direct_IO(rw, iocb, inode, iter, + offset, exfat_get_block); +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0) +#ifdef CONFIG_AIO_OPTIMIZATION + ret = blockdev_direct_IO(rw, iocb, inode, iter, + offset, exfat_get_block); +#else + ret = blockdev_direct_IO(rw, iocb, inode, iov, + offset, nr_segs, exfat_get_block); +#endif +#else + ret = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, + offset, nr_segs, exfat_get_block, NULL); +#endif + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,7,0) + if ((ret < 0) && (rw & WRITE)) + exfat_write_failed(mapping, iov_iter_count(iter)); +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0) + if ((ret < 0) && (rw & WRITE)) + exfat_write_failed(mapping, offset+iov_iter_count(iter)); +#elif LINUX_VERSION_CODE > KERNEL_VERSION(2,6,34) + if ((ret < 0) && (rw & WRITE)) +#ifdef CONFIG_AIO_OPTIMIZATION + exfat_write_failed(mapping, offset+iov_iter_count(iter)); +#else + exfat_write_failed(mapping, offset+iov_length(iov, nr_segs)); +#endif +#endif + return ret; +} + +static sector_t _exfat_bmap(struct address_space *mapping, sector_t block) +{ + sector_t blocknr; + + /* exfat_get_cluster() assumes the requested blocknr isn't truncated. */ +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,00) + down_read(&EXFAT_I(mapping->host)->truncate_lock); + blocknr = generic_block_bmap(mapping, block, exfat_get_block); + up_read(&EXFAT_I(mapping->host)->truncate_lock); +#else + down_read(&EXFAT_I(mapping->host)->i_alloc_sem); + blocknr = generic_block_bmap(mapping, block, exfat_get_block); + up_read(&EXFAT_I(mapping->host)->i_alloc_sem); +#endif + + return blocknr; +} + +const struct address_space_operations exfat_aops = { + .readpage = exfat_readpage, + .readpages = exfat_readpages, + .writepage = exfat_writepage, + .writepages = exfat_writepages, +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39) + .sync_page = block_sync_page, +#endif + .write_begin = exfat_write_begin, + .write_end = exfat_write_end, + .direct_IO = exfat_direct_IO, + .bmap = _exfat_bmap +}; + +/*======================================================================*/ +/* Super Operations */ +/*======================================================================*/ + +static inline unsigned long exfat_hash(loff_t i_pos) +{ + return hash_32(i_pos, EXFAT_HASH_BITS); +} + +static struct inode *exfat_iget(struct super_block *sb, loff_t i_pos) +{ + struct exfat_sb_info *sbi = EXFAT_SB(sb); + struct exfat_inode_info *info; + struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos); + struct inode *inode = NULL; +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,9,0) + struct hlist_node *node; + + spin_lock(&sbi->inode_hash_lock); + hlist_for_each_entry(info, node, head, i_hash_fat) { +#else + spin_lock(&sbi->inode_hash_lock); + hlist_for_each_entry(info, head, i_hash_fat) { +#endif + CHECK_ERR(info->vfs_inode.i_sb != sb); + + if (i_pos != info->i_pos) + continue; + inode = igrab(&info->vfs_inode); + if (inode) + break; + } + spin_unlock(&sbi->inode_hash_lock); + return inode; +} + +static void exfat_attach(struct inode *inode, loff_t i_pos) +{ + struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); + struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos); + + spin_lock(&sbi->inode_hash_lock); + EXFAT_I(inode)->i_pos = i_pos; + hlist_add_head(&EXFAT_I(inode)->i_hash_fat, head); + spin_unlock(&sbi->inode_hash_lock); +} + +static void exfat_detach(struct inode *inode) +{ + struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); + + spin_lock(&sbi->inode_hash_lock); + hlist_del_init(&EXFAT_I(inode)->i_hash_fat); + EXFAT_I(inode)->i_pos = 0; + spin_unlock(&sbi->inode_hash_lock); +} + +/* doesn't deal with root inode */ +static int exfat_fill_inode(struct inode *inode, FILE_ID_T *fid) +{ + struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); + FS_INFO_T *p_fs = &(sbi->fs_info); + DIR_ENTRY_T info; + + memcpy(&(EXFAT_I(inode)->fid), fid, sizeof(FILE_ID_T)); + + FsReadStat(inode, &info); + + EXFAT_I(inode)->i_pos = 0; + EXFAT_I(inode)->target = NULL; + inode->i_uid = sbi->options.fs_uid; + inode->i_gid = sbi->options.fs_gid; + inode->i_version++; + inode->i_generation = get_seconds(); + + if (info.Attr & ATTR_SUBDIR) { /* directory */ + inode->i_generation &= ~1; + inode->i_mode = exfat_make_mode(sbi, info.Attr, S_IRWXUGO); + inode->i_op = &exfat_dir_inode_operations; + inode->i_fop = &exfat_dir_operations; + + i_size_write(inode, info.Size); + EXFAT_I(inode)->mmu_private = i_size_read(inode); +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,00) + set_nlink(inode, info.NumSubdirs); +#else + inode->i_nlink = info.NumSubdirs; +#endif + } else if (info.Attr & ATTR_SYMLINK) { /* symbolic link */ + inode->i_generation |= 1; + inode->i_mode = exfat_make_mode(sbi, info.Attr, S_IRWXUGO); + inode->i_op = &exfat_symlink_inode_operations; + + i_size_write(inode, info.Size); + EXFAT_I(inode)->mmu_private = i_size_read(inode); + } else { /* regular file */ + inode->i_generation |= 1; + inode->i_mode = exfat_make_mode(sbi, info.Attr, S_IRWXUGO); + inode->i_op = &exfat_file_inode_operations; + inode->i_fop = &exfat_file_operations; + inode->i_mapping->a_ops = &exfat_aops; + inode->i_mapping->nrpages = 0; + + i_size_write(inode, info.Size); + EXFAT_I(inode)->mmu_private = i_size_read(inode); + } + exfat_save_attr(inode, info.Attr); + + inode->i_blocks = ((i_size_read(inode) + (p_fs->cluster_size - 1)) + & ~((loff_t)p_fs->cluster_size - 1)) >> 9; + + exfat_time_fat2unix(sbi, &inode->i_mtime, &info.ModifyTimestamp); + exfat_time_fat2unix(sbi, &inode->i_ctime, &info.CreateTimestamp); + exfat_time_fat2unix(sbi, &inode->i_atime, &info.AccessTimestamp); + + return 0; +} + +static struct inode *exfat_build_inode(struct super_block *sb, + FILE_ID_T *fid, loff_t i_pos) { + struct inode *inode; + int err; + + inode = exfat_iget(sb, i_pos); + if (inode) + goto out; + inode = new_inode(sb); + if (!inode) { + inode = ERR_PTR(-ENOMEM); + goto out; + } + inode->i_ino = iunique(sb, EXFAT_ROOT_INO); + inode->i_version = 1; + err = exfat_fill_inode(inode, fid); + if (err) { + iput(inode); + inode = ERR_PTR(err); + goto out; + } + exfat_attach(inode, i_pos); + insert_inode_hash(inode); +out: + return inode; +} + +static int exfat_sync_inode(struct inode *inode) +{ +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,34) + return exfat_write_inode(inode, 0); +#else + return exfat_write_inode(inode, NULL); +#endif +} + +static struct inode *exfat_alloc_inode(struct super_block *sb) +{ + struct exfat_inode_info *ei; + + ei = kmem_cache_alloc(exfat_inode_cachep, GFP_NOFS); + if (!ei) + return NULL; + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,00) + init_rwsem(&ei->truncate_lock); +#endif + + return &ei->vfs_inode; +} + +static void exfat_destroy_inode(struct inode *inode) +{ + if (EXFAT_I(inode)->target) + kfree(EXFAT_I(inode)->target); + EXFAT_I(inode)->target = NULL; + + kmem_cache_free(exfat_inode_cachep, EXFAT_I(inode)); +} + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,34) +static int exfat_write_inode(struct inode *inode, int wait) +#else +static int exfat_write_inode(struct inode *inode, struct writeback_control *wbc) +#endif +{ + struct super_block *sb = inode->i_sb; + struct exfat_sb_info *sbi = EXFAT_SB(sb); + DIR_ENTRY_T info; + + if (inode->i_ino == EXFAT_ROOT_INO) + return 0; + + info.Attr = exfat_make_attr(inode); + info.Size = i_size_read(inode); + + exfat_time_unix2fat(sbi, &inode->i_mtime, &info.ModifyTimestamp); + exfat_time_unix2fat(sbi, &inode->i_ctime, &info.CreateTimestamp); + exfat_time_unix2fat(sbi, &inode->i_atime, &info.AccessTimestamp); + + FsWriteStat(inode, &info); + + return 0; +} + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) +static void exfat_delete_inode(struct inode *inode) +{ + truncate_inode_pages(&inode->i_data, 0); + clear_inode(inode); +} + +static void exfat_clear_inode(struct inode *inode) +{ + exfat_detach(inode); + remove_inode_hash(inode); +} +#else +static void exfat_evict_inode(struct inode *inode) +{ + truncate_inode_pages(&inode->i_data, 0); + + if (!inode->i_nlink) + i_size_write(inode, 0); + invalidate_inode_buffers(inode); +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,5,0) + end_writeback(inode); +#else + clear_inode(inode); +#endif + exfat_detach(inode); + + remove_inode_hash(inode); +} +#endif + +static void exfat_free_super(struct exfat_sb_info *sbi) +{ + if (sbi->nls_disk) + unload_nls(sbi->nls_disk); + if (sbi->nls_io) + unload_nls(sbi->nls_io); + if (sbi->options.iocharset != exfat_default_iocharset) + kfree(sbi->options.iocharset); +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,0) + /* mutex_init is in exfat_fill_super function. only for 3.7+ */ + mutex_destroy(&sbi->s_lock); +#endif + kfree(sbi); +} + +static void exfat_put_super(struct super_block *sb) +{ + struct exfat_sb_info *sbi = EXFAT_SB(sb); + if (__is_sb_dirty(sb)) + exfat_write_super(sb); + + FsUmountVol(sb); + + sb->s_fs_info = NULL; + exfat_free_super(sbi); +} + +static void exfat_write_super(struct super_block *sb) +{ + __lock_super(sb); + + __set_sb_clean(sb); + + if (!(sb->s_flags & MS_RDONLY)) + FsSyncVol(sb, 1); + + __unlock_super(sb); +} + +static int exfat_sync_fs(struct super_block *sb, int wait) +{ + int err = 0; + + if (__is_sb_dirty(sb)) { + __lock_super(sb); + __set_sb_clean(sb); + err = FsSyncVol(sb, 1); + __unlock_super(sb); + } + + return err; +} + +static int exfat_statfs(struct dentry *dentry, struct kstatfs *buf) +{ + struct super_block *sb = dentry->d_sb; + u64 id = huge_encode_dev(sb->s_bdev->bd_dev); + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + VOL_INFO_T info; + + if (p_fs->used_clusters == (u32) ~0) { + if (FFS_MEDIAERR == FsGetVolInfo(sb, &info)) + return -EIO; + + } else { + info.FatType = p_fs->vol_type; + info.ClusterSize = p_fs->cluster_size; + info.NumClusters = p_fs->num_clusters - 2; + info.UsedClusters = p_fs->used_clusters; + info.FreeClusters = info.NumClusters - info.UsedClusters; + + if (p_fs->dev_ejected) + printk("[EXFAT] statfs on device is ejected\n"); + } + + buf->f_type = sb->s_magic; + buf->f_bsize = info.ClusterSize; + buf->f_blocks = info.NumClusters; + buf->f_bfree = info.FreeClusters; + buf->f_bavail = info.FreeClusters; + buf->f_fsid.val[0] = (u32)id; + buf->f_fsid.val[1] = (u32)(id >> 32); + buf->f_namelen = 260; + + return 0; +} + +static int exfat_remount(struct super_block *sb, int *flags, char *data) +{ + *flags |= MS_NODIRATIME; + return 0; +} + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0) +static int exfat_show_options(struct seq_file *m, struct dentry *root) +{ + struct exfat_sb_info *sbi = EXFAT_SB(root->d_sb); +#else +static int exfat_show_options(struct seq_file *m, struct vfsmount *mnt) +{ + struct exfat_sb_info *sbi = EXFAT_SB(mnt->mnt_sb); +#endif + struct exfat_mount_options *opts = &sbi->options; +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0) + if (__kuid_val(opts->fs_uid)) + seq_printf(m, ",uid=%u", __kuid_val(opts->fs_uid)); + if (__kgid_val(opts->fs_gid)) + seq_printf(m, ",gid=%u", __kgid_val(opts->fs_gid)); +#else + if (opts->fs_uid != 0) + seq_printf(m, ",uid=%u", opts->fs_uid); + if (opts->fs_gid != 0) + seq_printf(m, ",gid=%u", opts->fs_gid); +#endif + seq_printf(m, ",fmask=%04o", opts->fs_fmask); + seq_printf(m, ",dmask=%04o", opts->fs_dmask); + if (opts->allow_utime) + seq_printf(m, ",allow_utime=%04o", opts->allow_utime); + if (sbi->nls_disk) + seq_printf(m, ",codepage=%s", sbi->nls_disk->charset); + if (sbi->nls_io) + seq_printf(m, ",iocharset=%s", sbi->nls_io->charset); + seq_printf(m, ",namecase=%u", opts->casesensitive); + if (opts->errors == EXFAT_ERRORS_CONT) + seq_puts(m, ",errors=continue"); + else if (opts->errors == EXFAT_ERRORS_PANIC) + seq_puts(m, ",errors=panic"); + else + seq_puts(m, ",errors=remount-ro"); +#ifdef CONFIG_EXFAT_DISCARD + if (opts->discard) + seq_printf(m, ",discard"); +#endif + return 0; +} + +const struct super_operations exfat_sops = { + .alloc_inode = exfat_alloc_inode, + .destroy_inode = exfat_destroy_inode, + .write_inode = exfat_write_inode, +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) + .delete_inode = exfat_delete_inode, + .clear_inode = exfat_clear_inode, +#else + .evict_inode = exfat_evict_inode, +#endif + .put_super = exfat_put_super, +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0) + .write_super = exfat_write_super, +#endif + .sync_fs = exfat_sync_fs, + .statfs = exfat_statfs, + .remount_fs = exfat_remount, + .show_options = exfat_show_options, +}; + +/*======================================================================*/ +/* Export Operations */ +/*======================================================================*/ + +static struct inode *exfat_nfs_get_inode(struct super_block *sb, + u64 ino, u32 generation) +{ + struct inode *inode = NULL; + if (ino < EXFAT_ROOT_INO) + return inode; + inode = ilookup(sb, ino); + + if (inode && generation && (inode->i_generation != generation)) { + iput(inode); + inode = NULL; + } + + return inode; +} + +static struct dentry *exfat_fh_to_dentry(struct super_block *sb, struct fid *fid, + int fh_len, int fh_type) +{ + return generic_fh_to_dentry(sb, fid, fh_len, fh_type, + exfat_nfs_get_inode); +} + +static struct dentry *exfat_fh_to_parent(struct super_block *sb, struct fid *fid, + int fh_len, int fh_type) +{ + return generic_fh_to_parent(sb, fid, fh_len, fh_type, + exfat_nfs_get_inode); +} + +const struct export_operations exfat_export_ops = { + .fh_to_dentry = exfat_fh_to_dentry, + .fh_to_parent = exfat_fh_to_parent, +}; + +/*======================================================================*/ +/* Super Block Read Operations */ +/*======================================================================*/ + +enum { + Opt_uid, + Opt_gid, + Opt_umask, + Opt_dmask, + Opt_fmask, + Opt_allow_utime, + Opt_codepage, + Opt_charset, + Opt_namecase, + Opt_debug, + Opt_err_cont, + Opt_err_panic, + Opt_err_ro, + Opt_utf8_hack, + Opt_err, +#ifdef CONFIG_EXFAT_DISCARD + Opt_discard, +#endif /* EXFAT_CONFIG_DISCARD */ +}; + +static const match_table_t exfat_tokens = { + {Opt_uid, "uid=%u"}, + {Opt_gid, "gid=%u"}, + {Opt_umask, "umask=%o"}, + {Opt_dmask, "dmask=%o"}, + {Opt_fmask, "fmask=%o"}, + {Opt_allow_utime, "allow_utime=%o"}, + {Opt_codepage, "codepage=%u"}, + {Opt_charset, "iocharset=%s"}, + {Opt_namecase, "namecase=%u"}, + {Opt_debug, "debug"}, + {Opt_err_cont, "errors=continue"}, + {Opt_err_panic, "errors=panic"}, + {Opt_err_ro, "errors=remount-ro"}, + {Opt_utf8_hack, "utf8"}, +#ifdef CONFIG_EXFAT_DISCARD + {Opt_discard, "discard"}, +#endif /* CONFIG_EXFAT_DISCARD */ + {Opt_err, NULL} +}; + +static int parse_options(char *options, int silent, int *debug, + struct exfat_mount_options *opts) +{ + char *p; + substring_t args[MAX_OPT_ARGS]; + int option; + char *iocharset; + + opts->fs_uid = current_uid(); + opts->fs_gid = current_gid(); + opts->fs_fmask = opts->fs_dmask = current->fs->umask; + opts->allow_utime = (unsigned short) -1; + opts->codepage = exfat_default_codepage; + opts->iocharset = exfat_default_iocharset; + opts->casesensitive = 0; + opts->errors = EXFAT_ERRORS_RO; +#ifdef CONFIG_EXFAT_DISCARD + opts->discard = 0; +#endif + *debug = 0; + + if (!options) + goto out; + + while ((p = strsep(&options, ",")) != NULL) { + int token; + if (!*p) + continue; + + token = match_token(p, exfat_tokens, args); + switch (token) { + case Opt_uid: + if (match_int(&args[0], &option)) + return 0; +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0) + opts->fs_uid = KUIDT_INIT(option); +#else + opts->fs_uid = option; +#endif + break; + case Opt_gid: + if (match_int(&args[0], &option)) + return 0; +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0) + opts->fs_gid = KGIDT_INIT(option); +#else + opts->fs_gid = option; +#endif + break; + case Opt_umask: + case Opt_dmask: + case Opt_fmask: + if (match_octal(&args[0], &option)) + return 0; + if (token != Opt_dmask) + opts->fs_fmask = option; + if (token != Opt_fmask) + opts->fs_dmask = option; + break; + case Opt_allow_utime: + if (match_octal(&args[0], &option)) + return 0; + opts->allow_utime = option & (S_IWGRP | S_IWOTH); + break; + case Opt_codepage: + if (match_int(&args[0], &option)) + return 0; + opts->codepage = option; + break; + case Opt_charset: + if (opts->iocharset != exfat_default_iocharset) + kfree(opts->iocharset); + iocharset = match_strdup(&args[0]); + if (!iocharset) + return -ENOMEM; + opts->iocharset = iocharset; + break; + case Opt_namecase: + if (match_int(&args[0], &option)) + return 0; + opts->casesensitive = option; + break; + case Opt_err_cont: + opts->errors = EXFAT_ERRORS_CONT; + break; + case Opt_err_panic: + opts->errors = EXFAT_ERRORS_PANIC; + break; + case Opt_err_ro: + opts->errors = EXFAT_ERRORS_RO; + break; + case Opt_debug: + *debug = 1; + break; +#ifdef CONFIG_EXFAT_DISCARD + case Opt_discard: + opts->discard = 1; + break; +#endif /* CONFIG_EXFAT_DISCARD */ + case Opt_utf8_hack: + break; + default: + if (!silent) + printk(KERN_ERR "[EXFAT] Unrecognized mount option %s or missing value\n", p); + return -EINVAL; + } + } + +out: + if (opts->allow_utime == (unsigned short) -1) + opts->allow_utime = ~opts->fs_dmask & (S_IWGRP | S_IWOTH); + + return 0; +} + +static void exfat_hash_init(struct super_block *sb) +{ + struct exfat_sb_info *sbi = EXFAT_SB(sb); + int i; + + spin_lock_init(&sbi->inode_hash_lock); + for (i = 0; i < EXFAT_HASH_SIZE; i++) + INIT_HLIST_HEAD(&sbi->inode_hashtable[i]); +} + +static int exfat_read_root(struct inode *inode) +{ + struct super_block *sb = inode->i_sb; + struct exfat_sb_info *sbi = EXFAT_SB(sb); + FS_INFO_T *p_fs = &(sbi->fs_info); + DIR_ENTRY_T info; + + EXFAT_I(inode)->fid.dir.dir = p_fs->root_dir; + EXFAT_I(inode)->fid.dir.flags = 0x01; + EXFAT_I(inode)->fid.entry = -1; + EXFAT_I(inode)->fid.start_clu = p_fs->root_dir; + EXFAT_I(inode)->fid.flags = 0x01; + EXFAT_I(inode)->fid.type = TYPE_DIR; + EXFAT_I(inode)->fid.rwoffset = 0; + EXFAT_I(inode)->fid.hint_last_off = -1; + + EXFAT_I(inode)->target = NULL; + + FsReadStat(inode, &info); + + inode->i_uid = sbi->options.fs_uid; + inode->i_gid = sbi->options.fs_gid; + inode->i_version++; + inode->i_generation = 0; + inode->i_mode = exfat_make_mode(sbi, ATTR_SUBDIR, S_IRWXUGO); + inode->i_op = &exfat_dir_inode_operations; + inode->i_fop = &exfat_dir_operations; + + i_size_write(inode, info.Size); + inode->i_blocks = ((i_size_read(inode) + (p_fs->cluster_size - 1)) + & ~((loff_t)p_fs->cluster_size - 1)) >> 9; + EXFAT_I(inode)->i_pos = ((loff_t) p_fs->root_dir << 32) | 0xffffffff; + EXFAT_I(inode)->mmu_private = i_size_read(inode); + + exfat_save_attr(inode, ATTR_SUBDIR); + inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,00) + set_nlink(inode, info.NumSubdirs + 2); +#else + inode->i_nlink = info.NumSubdirs + 2; +#endif + + return 0; +} + +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,37) +static void setup_dops(struct super_block *sb) +{ + if (EXFAT_SB(sb)->options.casesensitive == 0) + sb->s_d_op = &exfat_ci_dentry_ops; + else + sb->s_d_op = &exfat_dentry_ops; +} +#endif + +static int exfat_fill_super(struct super_block *sb, void *data, int silent) +{ + struct inode *root_inode = NULL; + struct exfat_sb_info *sbi; + int debug, ret; + long error; + char buf[50]; + + /* + * GFP_KERNEL is ok here, because while we do hold the + * supeblock lock, memory pressure can't call back into + * the filesystem, since we're only just about to mount + * it and have no inodes etc active! + */ + sbi = kzalloc(sizeof(struct exfat_sb_info), GFP_KERNEL); + if (!sbi) + return -ENOMEM; +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,0) + mutex_init(&sbi->s_lock); +#endif + sb->s_fs_info = sbi; + sb->s_flags |= MS_NODIRATIME; + sb->s_magic = EXFAT_SUPER_MAGIC; + sb->s_op = &exfat_sops; + sb->s_export_op = &exfat_export_ops; + + error = parse_options(data, silent, &debug, &sbi->options); + if (error) + goto out_fail; + +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,37) + setup_dops(sb); +#endif + + error = -EIO; + sb_min_blocksize(sb, 512); + sb->s_maxbytes = 0x7fffffffffffffffLL; /* maximum file size */ + + ret = FsMountVol(sb); + if (ret) { + if (!silent) + printk(KERN_ERR "[EXFAT] FsMountVol failed\n"); + + goto out_fail; + } + + /* set up enough so that it can read an inode */ + exfat_hash_init(sb); + + /* + * The low byte of FAT's first entry must have same value with + * media-field. But in real world, too many devices is + * writing wrong value. So, removed that validity check. + * + * if (FAT_FIRST_ENT(sb, media) != first) + */ + + /* codepage is not meaningful in exfat */ + if (sbi->fs_info.vol_type != EXFAT) { + error = -EINVAL; + sprintf(buf, "cp%d", sbi->options.codepage); + sbi->nls_disk = load_nls(buf); + if (!sbi->nls_disk) { + printk(KERN_ERR "[EXFAT] Codepage %s not found\n", buf); + goto out_fail2; + } + } + + sbi->nls_io = load_nls(sbi->options.iocharset); + + error = -ENOMEM; + root_inode = new_inode(sb); + if (!root_inode) + goto out_fail2; + root_inode->i_ino = EXFAT_ROOT_INO; + root_inode->i_version = 1; + error = exfat_read_root(root_inode); + if (error < 0) + goto out_fail2; + error = -ENOMEM; + exfat_attach(root_inode, EXFAT_I(root_inode)->i_pos); + insert_inode_hash(root_inode); +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,00) + sb->s_root = d_make_root(root_inode); +#else + sb->s_root = d_alloc_root(root_inode); +#endif + if (!sb->s_root) { + printk(KERN_ERR "[EXFAT] Getting the root inode failed\n"); + goto out_fail2; + } + + return 0; + +out_fail2: + FsUmountVol(sb); +out_fail: + if (root_inode) + iput(root_inode); + sb->s_fs_info = NULL; + exfat_free_super(sbi); + return error; +} +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37) +static int exfat_get_sb(struct file_system_type *fs_type, + int flags, const char *dev_name, + void *data, struct vfsmount *mnt) +{ + return get_sb_bdev(fs_type, flags, dev_name, data, exfat_fill_super, mnt); +} +#else +static struct dentry *exfat_fs_mount(struct file_system_type *fs_type, + int flags, const char *dev_name, + void *data) { + return mount_bdev(fs_type, flags, dev_name, data, exfat_fill_super); +} +#endif + +static void init_once(void *foo) +{ + struct exfat_inode_info *ei = (struct exfat_inode_info *)foo; + + INIT_HLIST_NODE(&ei->i_hash_fat); + inode_init_once(&ei->vfs_inode); +} + +static int __init exfat_init_inodecache(void) +{ + exfat_inode_cachep = kmem_cache_create("exfat_inode_cache", + sizeof(struct exfat_inode_info), + 0, (SLAB_RECLAIM_ACCOUNT| + SLAB_MEM_SPREAD), + init_once); + if (exfat_inode_cachep == NULL) + return -ENOMEM; + return 0; +} + +static void __exit exfat_destroy_inodecache(void) +{ +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,6,0) + /* + * Make sure all delayed rcu free inodes are flushed before we + * destroy cache. + */ + rcu_barrier(); +#endif + kmem_cache_destroy(exfat_inode_cachep); +} + +#ifdef CONFIG_EXFAT_KERNEL_DEBUG +static void exfat_debug_kill_sb(struct super_block *sb) +{ + struct exfat_sb_info *sbi = EXFAT_SB(sb); + struct block_device *bdev = sb->s_bdev; + + long flags; + + if (sbi) { + flags = sbi->debug_flags; + + if (flags & EXFAT_DEBUGFLAGS_INVALID_UMOUNT) { + /* invalidate_bdev drops all device cache include dirty. + we use this to simulate device removal */ + FsReleaseCache(sb); + invalidate_bdev(bdev); + } + } + + kill_block_super(sb); +} +#endif /* CONFIG_EXFAT_KERNEL_DEBUG */ + +static struct file_system_type exfat_fs_type = { + .owner = THIS_MODULE, +#if defined(CONFIG_MACH_LGE) || defined(CONFIG_HTC_BATT_CORE) + .name = "texfat", +#else + .name = "exfat", +#endif +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37) + .get_sb = exfat_get_sb, +#else + .mount = exfat_fs_mount, +#endif +#ifdef CONFIG_EXFAT_KERNEL_DEBUG + .kill_sb = exfat_debug_kill_sb, +#else + .kill_sb = kill_block_super, +#endif /* CONFIG_EXFAT_KERNEL_DEBUG */ + .fs_flags = FS_REQUIRES_DEV, +}; + +static int __init init_exfat(void) +{ + int err; + + err = FsInit(); + if (err) { + if (err == FFS_MEMORYERR) + return -ENOMEM; + else + return -EIO; + } + + printk(KERN_INFO "exFAT: Version %s\n", EXFAT_VERSION); + + err = exfat_init_inodecache(); + if (err) + goto out; + + err = register_filesystem(&exfat_fs_type); + if (err) + goto out; + + return 0; +out: + FsShutdown(); + return err; +} + +static void __exit exit_exfat(void) +{ + exfat_destroy_inodecache(); + unregister_filesystem(&exfat_fs_type); + FsShutdown(); +} + +module_init(init_exfat); +module_exit(exit_exfat); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("exFAT Filesystem Driver"); +#ifdef MODULE_ALIAS_FS +#if defined(CONFIG_MACH_LGE) || defined(CONFIG_HTC_BATT_CORE) +MODULE_ALIAS_FS("texfat"); +#else +MODULE_ALIAS_FS("exfat"); +#endif +#endif \ No newline at end of file diff --git a/fs/exfat/exfat_super.h b/fs/exfat/exfat_super.h new file mode 100644 index 0000000000000000..916811e3d31e24f8 --- /dev/null +++ b/fs/exfat/exfat_super.h @@ -0,0 +1,171 @@ +/* Some of the source code in this file came from "linux/fs/fat/fat.h". */ + +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +#ifndef _EXFAT_LINUX_H +#define _EXFAT_LINUX_H + +#include +#include +#include +#include +#include +#include + +#include "exfat_config.h" +#include "exfat_data.h" +#include "exfat_oal.h" + +#include "exfat_blkdev.h" +#include "exfat_cache.h" +#include "exfat_nls.h" +#include "exfat_api.h" +#include "exfat_core.h" + +#define EXFAT_ERRORS_CONT 1 /* ignore error and continue */ +#define EXFAT_ERRORS_PANIC 2 /* panic on error */ +#define EXFAT_ERRORS_RO 3 /* remount r/o on error */ + +/* ioctl command */ +#define EXFAT_IOCTL_GET_VOLUME_ID _IOR('r', 0x12, __u32) + +struct exfat_mount_options { +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0) + kuid_t fs_uid; + kgid_t fs_gid; +#else + uid_t fs_uid; + gid_t fs_gid; +#endif + unsigned short fs_fmask; + unsigned short fs_dmask; + unsigned short allow_utime; /* permission for setting the [am]time */ + unsigned short codepage; /* codepage for shortname conversions */ + char *iocharset; /* charset for filename input/display */ + unsigned char casesensitive; + unsigned char errors; /* on error: continue, panic, remount-ro */ +#ifdef CONFIG_EXFAT_DISCARD + unsigned char discard; /* flag on if -o dicard specified and device support discard() */ +#endif /* CONFIG_EXFAT_DISCARD */ +}; + +#define EXFAT_HASH_BITS 8 +#define EXFAT_HASH_SIZE (1UL << EXFAT_HASH_BITS) + +/* + * EXFAT file system in-core superblock data + */ +struct exfat_sb_info { + FS_INFO_T fs_info; + BD_INFO_T bd_info; + + struct exfat_mount_options options; + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,00) + int s_dirt; + struct mutex s_lock; +#endif + struct nls_table *nls_disk; /* Codepage used on disk */ + struct nls_table *nls_io; /* Charset used for input and display */ + + struct inode *fat_inode; + + spinlock_t inode_hash_lock; + struct hlist_head inode_hashtable[EXFAT_HASH_SIZE]; +#ifdef CONFIG_EXFAT_KERNEL_DEBUG + long debug_flags; +#endif /* CONFIG_EXFAT_KERNEL_DEBUG */ +}; + +/* + * EXFAT file system inode data in memory + */ +struct exfat_inode_info { + FILE_ID_T fid; + char *target; + /* NOTE: mmu_private is 64bits, so must hold ->i_mutex to access */ + loff_t mmu_private; /* physically allocated size */ + loff_t i_pos; /* on-disk position of directory entry or 0 */ + struct hlist_node i_hash_fat; /* hash by i_location */ +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,00) + struct rw_semaphore truncate_lock; +#endif + struct inode vfs_inode; + struct rw_semaphore i_alloc_sem; /* protect bmap against truncate */ +}; + +#define EXFAT_SB(sb) ((struct exfat_sb_info *)((sb)->s_fs_info)) + +static inline struct exfat_inode_info *EXFAT_I(struct inode *inode) +{ + return container_of(inode, struct exfat_inode_info, vfs_inode); +} + +/* + * If ->i_mode can't hold S_IWUGO (i.e. ATTR_RO), we use ->i_attrs to + * save ATTR_RO instead of ->i_mode. + * + * If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only + * bit, it's just used as flag for app. + */ +static inline int exfat_mode_can_hold_ro(struct inode *inode) +{ + struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); + + if (S_ISDIR(inode->i_mode)) + return 0; + + if ((~sbi->options.fs_fmask) & S_IWUGO) + return 1; + return 0; +} + +/* Convert attribute bits and a mask to the UNIX mode. */ +static inline mode_t exfat_make_mode(struct exfat_sb_info *sbi, + u32 attr, mode_t mode) +{ + if ((attr & ATTR_READONLY) && !(attr & ATTR_SUBDIR)) + mode &= ~S_IWUGO; + + if (attr & ATTR_SUBDIR) + return (mode & ~sbi->options.fs_dmask) | S_IFDIR; + else if (attr & ATTR_SYMLINK) + return (mode & ~sbi->options.fs_dmask) | S_IFLNK; + else + return (mode & ~sbi->options.fs_fmask) | S_IFREG; +} + +/* Return the FAT attribute byte for this inode */ +static inline u32 exfat_make_attr(struct inode *inode) +{ + if (exfat_mode_can_hold_ro(inode) && !(inode->i_mode & S_IWUGO)) + return (EXFAT_I(inode)->fid.attr) | ATTR_READONLY; + else + return EXFAT_I(inode)->fid.attr; +} + +static inline void exfat_save_attr(struct inode *inode, u32 attr) +{ + if (exfat_mode_can_hold_ro(inode)) + EXFAT_I(inode)->fid.attr = attr & ATTR_RWMASK; + else + EXFAT_I(inode)->fid.attr = attr & (ATTR_RWMASK | ATTR_READONLY); +} + +#endif /* _EXFAT_LINUX_H */ diff --git a/fs/exfat/exfat_upcase.c b/fs/exfat/exfat_upcase.c new file mode 100644 index 0000000000000000..3807f37caacb5a56 --- /dev/null +++ b/fs/exfat/exfat_upcase.c @@ -0,0 +1,405 @@ +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +/************************************************************************/ +/* */ +/* PROJECT : exFAT & FAT12/16/32 File System */ +/* FILE : exfat_upcase.c */ +/* PURPOSE : exFAT Up-case Table */ +/* */ +/*----------------------------------------------------------------------*/ +/* NOTES */ +/* */ +/*----------------------------------------------------------------------*/ +/* REVISION HISTORY (Ver 0.9) */ +/* */ +/* - 2010.11.15 [Joosun Hahn] : first writing */ +/* */ +/************************************************************************/ + +#include "exfat_config.h" + +#include "exfat_nls.h" + +const u8 uni_upcase[NUM_UPCASE<<1] = { + 0x00, 0x00, 0x01, 0x00, 0x02, 0x00, 0x03, 0x00, 0x04, 0x00, 0x05, 0x00, 0x06, 0x00, 0x07, 0x00, + 0x08, 0x00, 0x09, 0x00, 0x0A, 0x00, 0x0B, 0x00, 0x0C, 0x00, 0x0D, 0x00, 0x0E, 0x00, 0x0F, 0x00, + 0x10, 0x00, 0x11, 0x00, 0x12, 0x00, 0x13, 0x00, 0x14, 0x00, 0x15, 0x00, 0x16, 0x00, 0x17, 0x00, + 0x18, 0x00, 0x19, 0x00, 0x1A, 0x00, 0x1B, 0x00, 0x1C, 0x00, 0x1D, 0x00, 0x1E, 0x00, 0x1F, 0x00, + 0x20, 0x00, 0x21, 0x00, 0x22, 0x00, 0x23, 0x00, 0x24, 0x00, 0x25, 0x00, 0x26, 0x00, 0x27, 0x00, + 0x28, 0x00, 0x29, 0x00, 0x2A, 0x00, 0x2B, 0x00, 0x2C, 0x00, 0x2D, 0x00, 0x2E, 0x00, 0x2F, 0x00, + 0x30, 0x00, 0x31, 0x00, 0x32, 0x00, 0x33, 0x00, 0x34, 0x00, 0x35, 0x00, 0x36, 0x00, 0x37, 0x00, + 0x38, 0x00, 0x39, 0x00, 0x3A, 0x00, 0x3B, 0x00, 0x3C, 0x00, 0x3D, 0x00, 0x3E, 0x00, 0x3F, 0x00, + 0x40, 0x00, 0x41, 0x00, 0x42, 0x00, 0x43, 0x00, 0x44, 0x00, 0x45, 0x00, 0x46, 0x00, 0x47, 0x00, + 0x48, 0x00, 0x49, 0x00, 0x4A, 0x00, 0x4B, 0x00, 0x4C, 0x00, 0x4D, 0x00, 0x4E, 0x00, 0x4F, 0x00, + 0x50, 0x00, 0x51, 0x00, 0x52, 0x00, 0x53, 0x00, 0x54, 0x00, 0x55, 0x00, 0x56, 0x00, 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0x03, 0xB6, 0x24, 0xB7, 0x24, 0xB8, 0x24, 0xB9, 0x24, 0xBA, 0x24, + 0xBB, 0x24, 0xBC, 0x24, 0xBD, 0x24, 0xBE, 0x24, 0xBF, 0x24, 0xC0, 0x24, 0xC1, 0x24, 0xC2, 0x24, + 0xC3, 0x24, 0xC4, 0x24, 0xC5, 0x24, 0xC6, 0x24, 0xC7, 0x24, 0xC8, 0x24, 0xC9, 0x24, 0xCA, 0x24, + 0xCB, 0x24, 0xCC, 0x24, 0xCD, 0x24, 0xCE, 0x24, 0xCF, 0x24, 0xFF, 0xFF, 0x46, 0x07, 0x00, 0x2C, + 0x01, 0x2C, 0x02, 0x2C, 0x03, 0x2C, 0x04, 0x2C, 0x05, 0x2C, 0x06, 0x2C, 0x07, 0x2C, 0x08, 0x2C, + 0x09, 0x2C, 0x0A, 0x2C, 0x0B, 0x2C, 0x0C, 0x2C, 0x0D, 0x2C, 0x0E, 0x2C, 0x0F, 0x2C, 0x10, 0x2C, + 0x11, 0x2C, 0x12, 0x2C, 0x13, 0x2C, 0x14, 0x2C, 0x15, 0x2C, 0x16, 0x2C, 0x17, 0x2C, 0x18, 0x2C, + 0x19, 0x2C, 0x1A, 0x2C, 0x1B, 0x2C, 0x1C, 0x2C, 0x1D, 0x2C, 0x1E, 0x2C, 0x1F, 0x2C, 0x20, 0x2C, + 0x21, 0x2C, 0x22, 0x2C, 0x23, 0x2C, 0x24, 0x2C, 0x25, 0x2C, 0x26, 0x2C, 0x27, 0x2C, 0x28, 0x2C, + 0x29, 0x2C, 0x2A, 0x2C, 0x2B, 0x2C, 0x2C, 0x2C, 0x2D, 0x2C, 0x2E, 0x2C, 0x5F, 0x2C, 0x60, 0x2C, + 0x60, 0x2C, 0x62, 0x2C, 0x63, 0x2C, 0x64, 0x2C, 0x65, 0x2C, 0x66, 0x2C, 0x67, 0x2C, 0x67, 0x2C, + 0x69, 0x2C, 0x69, 0x2C, 0x6B, 0x2C, 0x6B, 0x2C, 0x6D, 0x2C, 0x6E, 0x2C, 0x6F, 0x2C, 0x70, 0x2C, + 0x71, 0x2C, 0x72, 0x2C, 0x73, 0x2C, 0x74, 0x2C, 0x75, 0x2C, 0x75, 0x2C, 0x77, 0x2C, 0x78, 0x2C, + 0x79, 0x2C, 0x7A, 0x2C, 0x7B, 0x2C, 0x7C, 0x2C, 0x7D, 0x2C, 0x7E, 0x2C, 0x7F, 0x2C, 0x80, 0x2C, + 0x80, 0x2C, 0x82, 0x2C, 0x82, 0x2C, 0x84, 0x2C, 0x84, 0x2C, 0x86, 0x2C, 0x86, 0x2C, 0x88, 0x2C, + 0x88, 0x2C, 0x8A, 0x2C, 0x8A, 0x2C, 0x8C, 0x2C, 0x8C, 0x2C, 0x8E, 0x2C, 0x8E, 0x2C, 0x90, 0x2C, + 0x90, 0x2C, 0x92, 0x2C, 0x92, 0x2C, 0x94, 0x2C, 0x94, 0x2C, 0x96, 0x2C, 0x96, 0x2C, 0x98, 0x2C, + 0x98, 0x2C, 0x9A, 0x2C, 0x9A, 0x2C, 0x9C, 0x2C, 0x9C, 0x2C, 0x9E, 0x2C, 0x9E, 0x2C, 0xA0, 0x2C, + 0xA0, 0x2C, 0xA2, 0x2C, 0xA2, 0x2C, 0xA4, 0x2C, 0xA4, 0x2C, 0xA6, 0x2C, 0xA6, 0x2C, 0xA8, 0x2C, + 0xA8, 0x2C, 0xAA, 0x2C, 0xAA, 0x2C, 0xAC, 0x2C, 0xAC, 0x2C, 0xAE, 0x2C, 0xAE, 0x2C, 0xB0, 0x2C, + 0xB0, 0x2C, 0xB2, 0x2C, 0xB2, 0x2C, 0xB4, 0x2C, 0xB4, 0x2C, 0xB6, 0x2C, 0xB6, 0x2C, 0xB8, 0x2C, + 0xB8, 0x2C, 0xBA, 0x2C, 0xBA, 0x2C, 0xBC, 0x2C, 0xBC, 0x2C, 0xBE, 0x2C, 0xBE, 0x2C, 0xC0, 0x2C, + 0xC0, 0x2C, 0xC2, 0x2C, 0xC2, 0x2C, 0xC4, 0x2C, 0xC4, 0x2C, 0xC6, 0x2C, 0xC6, 0x2C, 0xC8, 0x2C, + 0xC8, 0x2C, 0xCA, 0x2C, 0xCA, 0x2C, 0xCC, 0x2C, 0xCC, 0x2C, 0xCE, 0x2C, 0xCE, 0x2C, 0xD0, 0x2C, + 0xD0, 0x2C, 0xD2, 0x2C, 0xD2, 0x2C, 0xD4, 0x2C, 0xD4, 0x2C, 0xD6, 0x2C, 0xD6, 0x2C, 0xD8, 0x2C, + 0xD8, 0x2C, 0xDA, 0x2C, 0xDA, 0x2C, 0xDC, 0x2C, 0xDC, 0x2C, 0xDE, 0x2C, 0xDE, 0x2C, 0xE0, 0x2C, + 0xE0, 0x2C, 0xE2, 0x2C, 0xE2, 0x2C, 0xE4, 0x2C, 0xE5, 0x2C, 0xE6, 0x2C, 0xE7, 0x2C, 0xE8, 0x2C, + 0xE9, 0x2C, 0xEA, 0x2C, 0xEB, 0x2C, 0xEC, 0x2C, 0xED, 0x2C, 0xEE, 0x2C, 0xEF, 0x2C, 0xF0, 0x2C, + 0xF1, 0x2C, 0xF2, 0x2C, 0xF3, 0x2C, 0xF4, 0x2C, 0xF5, 0x2C, 0xF6, 0x2C, 0xF7, 0x2C, 0xF8, 0x2C, + 0xF9, 0x2C, 0xFA, 0x2C, 0xFB, 0x2C, 0xFC, 0x2C, 0xFD, 0x2C, 0xFE, 0x2C, 0xFF, 0x2C, 0xA0, 0x10, + 0xA1, 0x10, 0xA2, 0x10, 0xA3, 0x10, 0xA4, 0x10, 0xA5, 0x10, 0xA6, 0x10, 0xA7, 0x10, 0xA8, 0x10, + 0xA9, 0x10, 0xAA, 0x10, 0xAB, 0x10, 0xAC, 0x10, 0xAD, 0x10, 0xAE, 0x10, 0xAF, 0x10, 0xB0, 0x10, + 0xB1, 0x10, 0xB2, 0x10, 0xB3, 0x10, 0xB4, 0x10, 0xB5, 0x10, 0xB6, 0x10, 0xB7, 0x10, 0xB8, 0x10, + 0xB9, 0x10, 0xBA, 0x10, 0xBB, 0x10, 0xBC, 0x10, 0xBD, 0x10, 0xBE, 0x10, 0xBF, 0x10, 0xC0, 0x10, + 0xC1, 0x10, 0xC2, 0x10, 0xC3, 0x10, 0xC4, 0x10, 0xC5, 0x10, 0xFF, 0xFF, 0x1B, 0xD2, 0x21, 0xFF, + 0x22, 0xFF, 0x23, 0xFF, 0x24, 0xFF, 0x25, 0xFF, 0x26, 0xFF, 0x27, 0xFF, 0x28, 0xFF, 0x29, 0xFF, + 0x2A, 0xFF, 0x2B, 0xFF, 0x2C, 0xFF, 0x2D, 0xFF, 0x2E, 0xFF, 0x2F, 0xFF, 0x30, 0xFF, 0x31, 0xFF, + 0x32, 0xFF, 0x33, 0xFF, 0x34, 0xFF, 0x35, 0xFF, 0x36, 0xFF, 0x37, 0xFF, 0x38, 0xFF, 0x39, 0xFF, + 0x3A, 0xFF, 0x5B, 0xFF, 0x5C, 0xFF, 0x5D, 0xFF, 0x5E, 0xFF, 0x5F, 0xFF, 0x60, 0xFF, 0x61, 0xFF, + 0x62, 0xFF, 0x63, 0xFF, 0x64, 0xFF, 0x65, 0xFF, 0x66, 0xFF, 0x67, 0xFF, 0x68, 0xFF, 0x69, 0xFF, + 0x6A, 0xFF, 0x6B, 0xFF, 0x6C, 0xFF, 0x6D, 0xFF, 0x6E, 0xFF, 0x6F, 0xFF, 0x70, 0xFF, 0x71, 0xFF, + 0x72, 0xFF, 0x73, 0xFF, 0x74, 0xFF, 0x75, 0xFF, 0x76, 0xFF, 0x77, 0xFF, 0x78, 0xFF, 0x79, 0xFF, + 0x7A, 0xFF, 0x7B, 0xFF, 0x7C, 0xFF, 0x7D, 0xFF, 0x7E, 0xFF, 0x7F, 0xFF, 0x80, 0xFF, 0x81, 0xFF, + 0x82, 0xFF, 0x83, 0xFF, 0x84, 0xFF, 0x85, 0xFF, 0x86, 0xFF, 0x87, 0xFF, 0x88, 0xFF, 0x89, 0xFF, + 0x8A, 0xFF, 0x8B, 0xFF, 0x8C, 0xFF, 0x8D, 0xFF, 0x8E, 0xFF, 0x8F, 0xFF, 0x90, 0xFF, 0x91, 0xFF, + 0x92, 0xFF, 0x93, 0xFF, 0x94, 0xFF, 0x95, 0xFF, 0x96, 0xFF, 0x97, 0xFF, 0x98, 0xFF, 0x99, 0xFF, + 0x9A, 0xFF, 0x9B, 0xFF, 0x9C, 0xFF, 0x9D, 0xFF, 0x9E, 0xFF, 0x9F, 0xFF, 0xA0, 0xFF, 0xA1, 0xFF, + 0xA2, 0xFF, 0xA3, 0xFF, 0xA4, 0xFF, 0xA5, 0xFF, 0xA6, 0xFF, 0xA7, 0xFF, 0xA8, 0xFF, 0xA9, 0xFF, + 0xAA, 0xFF, 0xAB, 0xFF, 0xAC, 0xFF, 0xAD, 0xFF, 0xAE, 0xFF, 0xAF, 0xFF, 0xB0, 0xFF, 0xB1, 0xFF, + 0xB2, 0xFF, 0xB3, 0xFF, 0xB4, 0xFF, 0xB5, 0xFF, 0xB6, 0xFF, 0xB7, 0xFF, 0xB8, 0xFF, 0xB9, 0xFF, + 0xBA, 0xFF, 0xBB, 0xFF, 0xBC, 0xFF, 0xBD, 0xFF, 0xBE, 0xFF, 0xBF, 0xFF, 0xC0, 0xFF, 0xC1, 0xFF, + 0xC2, 0xFF, 0xC3, 0xFF, 0xC4, 0xFF, 0xC5, 0xFF, 0xC6, 0xFF, 0xC7, 0xFF, 0xC8, 0xFF, 0xC9, 0xFF, + 0xCA, 0xFF, 0xCB, 0xFF, 0xCC, 0xFF, 0xCD, 0xFF, 0xCE, 0xFF, 0xCF, 0xFF, 0xD0, 0xFF, 0xD1, 0xFF, + 0xD2, 0xFF, 0xD3, 0xFF, 0xD4, 0xFF, 0xD5, 0xFF, 0xD6, 0xFF, 0xD7, 0xFF, 0xD8, 0xFF, 0xD9, 0xFF, + 0xDA, 0xFF, 0xDB, 0xFF, 0xDC, 0xFF, 0xDD, 0xFF, 0xDE, 0xFF, 0xDF, 0xFF, 0xE0, 0xFF, 0xE1, 0xFF, + 0xE2, 0xFF, 0xE3, 0xFF, 0xE4, 0xFF, 0xE5, 0xFF, 0xE6, 0xFF, 0xE7, 0xFF, 0xE8, 0xFF, 0xE9, 0xFF, + 0xEA, 0xFF, 0xEB, 0xFF, 0xEC, 0xFF, 0xED, 0xFF, 0xEE, 0xFF, 0xEF, 0xFF, 0xF0, 0xFF, 0xF1, 0xFF, + 0xF2, 0xFF, 0xF3, 0xFF, 0xF4, 0xFF, 0xF5, 0xFF, 0xF6, 0xFF, 0xF7, 0xFF, 0xF8, 0xFF, 0xF9, 0xFF, + 0xFA, 0xFF, 0xFB, 0xFF, 0xFC, 0xFF, 0xFD, 0xFF, 0xFE, 0xFF, 0xFF, 0xFF +}; diff --git a/fs/exfat/exfat_version.h b/fs/exfat/exfat_version.h new file mode 100644 index 0000000000000000..a93fa46be04e8d6a --- /dev/null +++ b/fs/exfat/exfat_version.h @@ -0,0 +1,19 @@ +/************************************************************************/ +/* */ +/* PROJECT : exFAT & FAT12/16/32 File System */ +/* FILE : exfat_version.h */ +/* PURPOSE : exFAT File Manager */ +/* */ +/*----------------------------------------------------------------------*/ +/* NOTES */ +/* */ +/*----------------------------------------------------------------------*/ +/* REVISION HISTORY */ +/* */ +/* - 2012.02.10 : Release Version 1.1.0 */ +/* - 2012.04.02 : P1 : Change Module License to Samsung Proprietary */ +/* - 2012.06.07 : P2 : Fixed incorrect filename problem */ +/* */ +/************************************************************************/ + +#define EXFAT_VERSION "1.2.9" diff --git a/fs/open.c b/fs/open.c index 35bb784763a4fde3..d8dc52ad435c1f06 100644 --- a/fs/open.c +++ b/fs/open.c @@ -34,6 +34,9 @@ #include "internal.h" +#define CREATE_TRACE_POINTS +#include + int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs, struct file *filp) { @@ -1063,6 +1066,7 @@ long do_sys_open(int dfd, const char __user *filename, int flags, umode_t mode) } else { fsnotify_open(f); fd_install(fd, f); + trace_do_sys_open(tmp->name, flags, mode); } } putname(tmp); diff --git a/fs/proc/base.c b/fs/proc/base.c index 719c2e943ea1028f..e5bf085fc0345c3c 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -464,7 +464,7 @@ static int proc_pid_schedstat(struct seq_file *m, struct pid_namespace *ns, seq_printf(m, "0 0 0\n"); else seq_printf(m, "%llu %llu %lu\n", - (unsigned long long)task->se.sum_exec_runtime, + (unsigned long long)tsk_seruntime(task), (unsigned long long)task->sched_info.run_delay, task->sched_info.pcount); diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 2a5d52fa90f5da35..743ac9afe6f1416e 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -44,16 +44,20 @@ struct blk_queue_stats; struct blk_stat_callback; #define BLKDEV_MIN_RQ 4 +#ifdef CONFIG_PCK_INTERACTIVE +#define BLKDEV_MAX_RQ 512 +#else #define BLKDEV_MAX_RQ 128 /* Default maximum */ +#endif /* Must be consisitent with blk_mq_poll_stats_bkt() */ #define BLK_MQ_POLL_STATS_BKTS 16 /* * Maximum number of blkcg policies allowed to be registered concurrently. * Defined here to simplify include dependency. */ -#define BLKCG_MAX_POLS 3 +#define BLKCG_MAX_POLS 5 typedef void (rq_end_io_fn)(struct request *, blk_status_t); @@ -120,6 +124,10 @@ typedef __u32 __bitwise req_flags_t; /* Look at ->special_vec for the actual data payload instead of the bio chain. */ #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18)) +/* DEBUG: rq in bfq-mq dispatch list */ +#define RQF_DISP_LIST ((__force req_flags_t)(1 << 19)) +/* DEBUG: rq had get_rq_private executed on it */ +#define RQF_GOT ((__force req_flags_t)(1 << 20)) /* flags that prevent us from merging requests: */ #define RQF_NOMERGE_FLAGS \ diff --git a/include/linux/init_task.h b/include/linux/init_task.h index a2f6707e9fc054a9..6b1e807ab1bbe287 100644 --- a/include/linux/init_task.h +++ b/include/linux/init_task.h @@ -177,8 +177,6 @@ extern struct cred init_cred; # define INIT_VTIME(tsk) #endif -#define INIT_TASK_COMM "swapper" - #ifdef CONFIG_RT_MUTEXES # define INIT_RT_MUTEXES(tsk) \ .pi_waiters = RB_ROOT, \ @@ -229,6 +227,80 @@ extern struct cred init_cred; * INIT_TASK is used to set up the first task table, touch at * your own risk!. Base=0, limit=0x1fffff (=2MB) */ +#ifdef CONFIG_SCHED_MUQSS +#define INIT_TASK_COMM "MuQSS" +#define INIT_TASK(tsk) \ +{ \ + INIT_TASK_TI(tsk) \ + .state = 0, \ + .stack = init_stack, \ + .usage = ATOMIC_INIT(2), \ + .flags = PF_KTHREAD, \ + .prio = NORMAL_PRIO, \ + .static_prio = MAX_PRIO-20, \ + .normal_prio = NORMAL_PRIO, \ + .deadline = 0, \ + .policy = SCHED_NORMAL, \ + .cpus_allowed = CPU_MASK_ALL, \ + .mm = NULL, \ + .active_mm = &init_mm, \ + .restart_block = { \ + .fn = do_no_restart_syscall, \ + }, \ + .time_slice = 1000000, \ + .tasks = LIST_HEAD_INIT(tsk.tasks), \ + INIT_PUSHABLE_TASKS(tsk) \ + .ptraced = LIST_HEAD_INIT(tsk.ptraced), \ + .ptrace_entry = LIST_HEAD_INIT(tsk.ptrace_entry), \ + .real_parent = &tsk, \ + .parent = &tsk, \ + .children = LIST_HEAD_INIT(tsk.children), \ + .sibling = LIST_HEAD_INIT(tsk.sibling), \ + .group_leader = &tsk, \ + RCU_POINTER_INITIALIZER(real_cred, &init_cred), \ + RCU_POINTER_INITIALIZER(cred, &init_cred), \ + .comm = INIT_TASK_COMM, \ + .thread = INIT_THREAD, \ + .fs = &init_fs, \ + .files = &init_files, \ + .signal = &init_signals, \ + .sighand = &init_sighand, \ + .nsproxy = &init_nsproxy, \ + .pending = { \ + .list = LIST_HEAD_INIT(tsk.pending.list), \ + .signal = {{0}}}, \ + .blocked = {{0}}, \ + .alloc_lock = __SPIN_LOCK_UNLOCKED(tsk.alloc_lock), \ + .journal_info = NULL, \ + INIT_CPU_TIMERS(tsk) \ + .pi_lock = __RAW_SPIN_LOCK_UNLOCKED(tsk.pi_lock), \ + .timer_slack_ns = 50000, /* 50 usec default slack */ \ + .pids = { \ + [PIDTYPE_PID] = INIT_PID_LINK(PIDTYPE_PID), \ + [PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID), \ + [PIDTYPE_SID] = INIT_PID_LINK(PIDTYPE_SID), \ + }, \ + .thread_group = LIST_HEAD_INIT(tsk.thread_group), \ + .thread_node = LIST_HEAD_INIT(init_signals.thread_head), \ + INIT_IDS \ + INIT_PERF_EVENTS(tsk) \ + INIT_TRACE_IRQFLAGS \ + INIT_LOCKDEP \ + INIT_FTRACE_GRAPH \ + INIT_TRACE_RECURSION \ + INIT_TASK_RCU_PREEMPT(tsk) \ + INIT_TASK_RCU_TASKS(tsk) \ + INIT_CPUSET_SEQ(tsk) \ + INIT_RT_MUTEXES(tsk) \ + INIT_PREV_CPUTIME(tsk) \ + INIT_VTIME(tsk) \ + INIT_NUMA_BALANCING(tsk) \ + INIT_KASAN(tsk) \ + INIT_LIVEPATCH(tsk) \ + INIT_TASK_SECURITY \ +} +#else /* CONFIG_SCHED_MUQSS */ +#define INIT_TASK_COMM "swapper" #define INIT_TASK(tsk) \ { \ INIT_TASK_TI(tsk) \ @@ -306,7 +378,7 @@ extern struct cred init_cred; INIT_LIVEPATCH(tsk) \ INIT_TASK_SECURITY \ } - +#endif /* CONFIG_SCHED_MUQSS */ /* Attach to the init_task data structure for proper alignment */ #define __init_task_data __attribute__((__section__(".data..init_task"))) diff --git a/include/linux/ioprio.h b/include/linux/ioprio.h index 8c1239020d79d36a..ebe98b91de3b3369 100644 --- a/include/linux/ioprio.h +++ b/include/linux/ioprio.h @@ -51,6 +51,8 @@ enum { */ static inline int task_nice_ioprio(struct task_struct *task) { + if (iso_task(task)) + return 0; return (task_nice(task) + 20) / 5; } diff --git a/include/linux/linux_logo.h b/include/linux/linux_logo.h index ca5bd91d12e169cd..5489dcb0f8bf0e30 100644 --- a/include/linux/linux_logo.h +++ b/include/linux/linux_logo.h @@ -37,6 +37,18 @@ extern const struct linux_logo logo_linux_vga16; extern const struct linux_logo logo_linux_clut224; extern const struct linux_logo logo_blackfin_vga16; extern const struct linux_logo logo_blackfin_clut224; +extern const struct linux_logo logo_zen_clut224; +extern const struct linux_logo logo_oldzen_clut224; +extern const struct linux_logo logo_arch_clut224; +extern const struct linux_logo logo_gentoo_clut224; +extern const struct linux_logo logo_exherbo_clut224; +extern const struct linux_logo logo_slackware_clut224; +extern const struct linux_logo logo_debian_clut224; +extern const struct linux_logo logo_fedorasimple_clut224; +extern const struct linux_logo logo_fedoraglossy_clut224; +extern const struct linux_logo logo_tits_clut224; +extern const struct linux_logo logo_bsd_clut224; +extern const struct linux_logo logo_fbsd_clut224; extern const struct linux_logo logo_dec_clut224; extern const struct linux_logo logo_mac_clut224; extern const struct linux_logo logo_parisc_clut224; diff --git a/include/linux/sched.h b/include/linux/sched.h index c05ac5f5aa034db1..2057e2482a45a946 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -26,6 +26,9 @@ #include #include #include +#ifdef CONFIG_SCHED_MUQSS +#include +#endif /* task_struct member predeclarations (sorted alphabetically): */ struct audit_context; @@ -539,29 +542,46 @@ struct task_struct { unsigned int flags; unsigned int ptrace; +#if defined(CONFIG_SMP) || defined(CONFIG_SCHED_MUQSS) + int on_cpu; +#endif #ifdef CONFIG_SMP struct llist_node wake_entry; - int on_cpu; #ifdef CONFIG_THREAD_INFO_IN_TASK /* Current CPU: */ unsigned int cpu; #endif unsigned int wakee_flips; unsigned long wakee_flip_decay_ts; struct task_struct *last_wakee; int wake_cpu; #endif int on_rq; int prio; int static_prio; int normal_prio; unsigned int rt_priority; +#ifdef CONFIG_SCHED_MUQSS + int time_slice; + u64 deadline; + skiplist_node node; /* Skip list node */ + u64 last_ran; + u64 sched_time; /* sched_clock time spent running */ +#ifdef CONFIG_SMT_NICE + int smt_bias; /* Policy/nice level bias across smt siblings */ +#endif +#ifdef CONFIG_HOTPLUG_CPU + bool zerobound; /* Bound to CPU0 for hotplug */ +#endif + unsigned long rt_timeout; +#else /* CONFIG_SCHED_MUQSS */ const struct sched_class *sched_class; struct sched_entity se; struct sched_rt_entity rt; +#endif #ifdef CONFIG_CGROUP_SCHED struct task_group *sched_task_group; #endif @@ -709,6 +729,10 @@ struct task_struct { #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME u64 utimescaled; u64 stimescaled; +#endif +#ifdef CONFIG_SCHED_MUQSS + /* Unbanked cpu time */ + unsigned long utime_ns, stime_ns; #endif u64 gtime; struct prev_cputime prev_cputime; @@ -1104,6 +1128,40 @@ struct task_struct { */ }; +#ifdef CONFIG_SCHED_MUQSS +#define tsk_seruntime(t) ((t)->sched_time) +#define tsk_rttimeout(t) ((t)->rt_timeout) + +static inline void tsk_cpus_current(struct task_struct *p) +{ +} + +void print_scheduler_version(void); + +static inline bool iso_task(struct task_struct *p) +{ + return (p->policy == SCHED_ISO); +} +#else /* CFS */ +#define tsk_seruntime(t) ((t)->se.sum_exec_runtime) +#define tsk_rttimeout(t) ((t)->rt.timeout) + +static inline void tsk_cpus_current(struct task_struct *p) +{ + p->nr_cpus_allowed = current->nr_cpus_allowed; +} + +static inline void print_scheduler_version(void) +{ + printk(KERN_INFO "CFS CPU scheduler.\n"); +} + +static inline bool iso_task(struct task_struct *p) +{ + return false; +} +#endif /* CONFIG_SCHED_MUQSS */ + static inline struct pid *task_pid(struct task_struct *task) { return task->pids[PIDTYPE_PID].pid; diff --git a/include/linux/sched/nohz.h b/include/linux/sched/nohz.h index 028d17b918a7e28b..51d6b336c75596b9 100644 --- a/include/linux/sched/nohz.h +++ b/include/linux/sched/nohz.h @@ -5,24 +5,24 @@ * This is the interface between the scheduler and nohz/dynticks: */ -#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) +#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) && !defined(CONFIG_SCHED_MUQSS) extern void cpu_load_update_nohz_start(void); extern void cpu_load_update_nohz_stop(void); #else static inline void cpu_load_update_nohz_start(void) { } static inline void cpu_load_update_nohz_stop(void) { } #endif #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) extern void nohz_balance_enter_idle(int cpu); extern void set_cpu_sd_state_idle(void); extern int get_nohz_timer_target(void); #else static inline void nohz_balance_enter_idle(int cpu) { } static inline void set_cpu_sd_state_idle(void) { } #endif -#ifdef CONFIG_NO_HZ_COMMON +#if defined(CONFIG_NO_HZ_COMMON) && !defined(CONFIG_SCHED_MUQSS) void calc_load_nohz_start(void); void calc_load_nohz_stop(void); #else diff --git a/include/linux/sched/prio.h b/include/linux/sched/prio.h index 2cc450f6ec5423cc..7bb2181d3ac7121f 100644 --- a/include/linux/sched/prio.h +++ b/include/linux/sched/prio.h @@ -19,8 +19,20 @@ */ #define MAX_USER_RT_PRIO 100 + +#ifdef CONFIG_SCHED_MUQSS +/* Note different MAX_RT_PRIO */ +#define MAX_RT_PRIO (MAX_USER_RT_PRIO + 1) + +#define ISO_PRIO (MAX_RT_PRIO) +#define NORMAL_PRIO (MAX_RT_PRIO + 1) +#define IDLE_PRIO (MAX_RT_PRIO + 2) +#define PRIO_LIMIT ((IDLE_PRIO) + 1) +#else /* CONFIG_SCHED_MUQSS */ #define MAX_RT_PRIO MAX_USER_RT_PRIO +#endif /* CONFIG_SCHED_MUQSS */ + #define MAX_PRIO (MAX_RT_PRIO + NICE_WIDTH) #define DEFAULT_PRIO (MAX_RT_PRIO + NICE_WIDTH / 2) diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h index c97e5f09692768d0..8c71fcae7dd382a7 100644 --- a/include/linux/sched/task.h +++ b/include/linux/sched/task.h @@ -80,7 +80,7 @@ extern long kernel_wait4(pid_t, int *, int, struct rusage *); extern void free_task(struct task_struct *tsk); /* sched_exec is called by processes performing an exec */ -#ifdef CONFIG_SMP +#if defined(CONFIG_SMP) && !defined(CONFIG_SCHED_MUQSS) extern void sched_exec(void); #else #define sched_exec() {} diff --git a/include/linux/skip_list.h b/include/linux/skip_list.h new file mode 100644 index 0000000000000000..d4be84ba273b6dbd --- /dev/null +++ b/include/linux/skip_list.h @@ -0,0 +1,33 @@ +#ifndef _LINUX_SKIP_LISTS_H +#define _LINUX_SKIP_LISTS_H +typedef u64 keyType; +typedef void *valueType; + +typedef struct nodeStructure skiplist_node; + +struct nodeStructure { + int level; /* Levels in this structure */ + keyType key; + valueType value; + skiplist_node *next[8]; + skiplist_node *prev[8]; +}; + +typedef struct listStructure { + int entries; + int level; /* Maximum level of the list + (1 more than the number of levels in the list) */ + skiplist_node *header; /* pointer to header */ +} skiplist; + +void skiplist_init(skiplist_node *slnode); +skiplist *new_skiplist(skiplist_node *slnode); +void free_skiplist(skiplist *l); +void skiplist_node_init(skiplist_node *node); +void skiplist_insert(skiplist *l, skiplist_node *node, keyType key, valueType value, unsigned int randseed); +void skiplist_delete(skiplist *l, skiplist_node *node); + +static inline bool skiplist_node_empty(skiplist_node *node) { + return (!node->next[0]); +} +#endif /* _LINUX_SKIP_LISTS_H */ diff --git a/include/linux/thinkpad_ec.h b/include/linux/thinkpad_ec.h new file mode 100644 index 0000000000000000..1b80d7ee549359ab --- /dev/null +++ b/include/linux/thinkpad_ec.h @@ -0,0 +1,47 @@ +/* + * thinkpad_ec.h - interface to ThinkPad embedded controller LPC3 functions + * + * Copyright (C) 2005 Shem Multinymous + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef _THINKPAD_EC_H +#define _THINKPAD_EC_H + +#ifdef __KERNEL__ + +#define TP_CONTROLLER_ROW_LEN 16 + +/* EC transactions input and output (possibly partial) vectors of 16 bytes. */ +struct thinkpad_ec_row { + u16 mask; /* bitmap of which entries of val[] are meaningful */ + u8 val[TP_CONTROLLER_ROW_LEN]; +}; + +extern int __must_check thinkpad_ec_lock(void); +extern int __must_check thinkpad_ec_try_lock(void); +extern void thinkpad_ec_unlock(void); + +extern int thinkpad_ec_read_row(const struct thinkpad_ec_row *args, + struct thinkpad_ec_row *data); +extern int thinkpad_ec_try_read_row(const struct thinkpad_ec_row *args, + struct thinkpad_ec_row *mask); +extern int thinkpad_ec_prefetch_row(const struct thinkpad_ec_row *args); +extern void thinkpad_ec_invalidate(void); + + +#endif /* __KERNEL */ +#endif /* _THINKPAD_EC_H */ diff --git a/include/trace/events/fs.h b/include/trace/events/fs.h new file mode 100644 index 0000000000000000..fb634b74adf3fb7f --- /dev/null +++ b/include/trace/events/fs.h @@ -0,0 +1,53 @@ +#undef TRACE_SYSTEM +#define TRACE_SYSTEM fs + +#if !defined(_TRACE_FS_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_FS_H + +#include +#include + +TRACE_EVENT(do_sys_open, + + TP_PROTO(const char *filename, int flags, int mode), + + TP_ARGS(filename, flags, mode), + + TP_STRUCT__entry( + __string( filename, filename ) + __field( int, flags ) + __field( int, mode ) + ), + + TP_fast_assign( + __assign_str(filename, filename); + __entry->flags = flags; + __entry->mode = mode; + ), + + TP_printk("\"%s\" %x %o", + __get_str(filename), __entry->flags, __entry->mode) +); + +TRACE_EVENT(open_exec, + + TP_PROTO(const char *filename), + + TP_ARGS(filename), + + TP_STRUCT__entry( + __string( filename, filename ) + ), + + TP_fast_assign( + __assign_str(filename, filename); + ), + + TP_printk("\"%s\"", + __get_str(filename)) +); + +#endif /* _TRACE_FS_H */ + +/* This part must be outside protection */ +#include diff --git a/include/uapi/linux/sched.h b/include/uapi/linux/sched.h index e2a6c7b3510b4a73..ccc4bc0a5d104d36 100644 --- a/include/uapi/linux/sched.h +++ b/include/uapi/linux/sched.h @@ -36,9 +36,16 @@ #define SCHED_FIFO 1 #define SCHED_RR 2 #define SCHED_BATCH 3 -/* SCHED_ISO: reserved but not implemented yet */ +/* SCHED_ISO: Implemented on MuQSS only */ #define SCHED_IDLE 5 +#ifdef CONFIG_SCHED_MUQSS +#define SCHED_ISO 4 +#define SCHED_IDLEPRIO SCHED_IDLE +#define SCHED_MAX (SCHED_IDLEPRIO) +#define SCHED_RANGE(policy) ((policy) <= SCHED_MAX) +#else /* CONFIG_SCHED_MUQSS */ #define SCHED_DEADLINE 6 +#endif /* CONFIG_SCHED_MUQSS */ /* Can be ORed in to make sure the process is reverted back to SCHED_NORMAL on fork */ #define SCHED_RESET_ON_FORK 0x40000000 diff --git a/include/uapi/linux/vt.h b/include/uapi/linux/vt.h index f69034887e687d3a..18db2755a27c2686 100644 --- a/include/uapi/linux/vt.h +++ b/include/uapi/linux/vt.h @@ -2,12 +2,25 @@ #define _UAPI_LINUX_VT_H +/* + * We will make this definition solely for the purpose of making packages + * such as splashutils build, because they can not understand that + * NR_TTY_DEVICES is defined in the kernel configuration. + */ +#ifndef CONFIG_NR_TTY_DEVICES +#define CONFIG_NR_TTY_DEVICES 63 +#endif + /* * These constants are also useful for user-level apps (e.g., VC * resizing). */ #define MIN_NR_CONSOLES 1 /* must be at least 1 */ -#define MAX_NR_CONSOLES 63 /* serial lines start at 64 */ +/* + * NR_TTY_DEVICES: + * Value MUST be at least 12 and must never be higher then 63 + */ +#define MAX_NR_CONSOLES CONFIG_NR_TTY_DEVICES /* serial lines start above this */ /* Note: the ioctl VT_GETSTATE does not work for consoles 16 and higher (since it returns a short) */ diff --git a/init/Kconfig b/init/Kconfig index 8514b25db21c6bb6..07879460209d2a48 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -38,6 +38,47 @@ config THREAD_INFO_IN_TASK menu "General setup" +config PCK_INTERACTIVE + bool "Tune kernel for interactivity" + default y + help + Tunes the kernel for responsiveness at the cost of throughput and power usage. + + --- Virtual Memory Subsystem --------------------------- + + Mem dirty before bg writeback..: 10 % -> 20 % + Mem dirty before sync writeback: 20 % -> 50 % + + --- Block Layer ---------------------------------------- + + Block Layer Queue Depth........: 128 -> 512 + Default MQ scheduler......: mq-deadline -> bfq + + --- CPU Scheduler (CFS) -------------------------------- + + Scheduling latency.............: 6 -> 3 ms + Minimal granularity............: 0.75 -> 0.3 ms + Wakeup granularity.............: 1 -> 0.5 ms + CPU migration cost.............: 0.5 -> 0.25 ms + Bandwidth slice size...........: 5 -> 3 ms + Ondemand fine upscaling limit..: 95 % -> 85 % + + --- CPU Scheduler (MuQSS) ------------------------------ + + Scheduling interval............: 6 -> 3 ms + ISO task max realtime use......: 70 % -> 25 % + Ondemand coarse upscaling limit: 80 % -> 45 % + Ondemand fine upscaling limit..: 95 % -> 45 % + +config SCHED_MUQSS + bool "MuQSS cpu scheduler" + select HIGH_RES_TIMERS + default n + ---help--- + The Multiple Queue Skiplist Scheduler for excellent interactivity and + responsiveness on the desktop and highly scalable deterministic + low latency on any hardware. + config BROKEN bool @@ -620,6 +661,7 @@ config NUMA_BALANCING depends on ARCH_SUPPORTS_NUMA_BALANCING depends on !ARCH_WANT_NUMA_VARIABLE_LOCALITY depends on SMP && NUMA && MIGRATION + depends on !SCHED_MUQSS help This option adds support for automatic NUMA aware memory/task placement. The mechanism is quite primitive and is based on migrating memory when @@ -722,9 +764,13 @@ menuconfig CGROUP_SCHED help This feature lets CPU scheduler recognize task groups and control CPU bandwidth allocation to such task groups. It uses cgroups to group - tasks. + tasks. In combination with MuQSS this is purely a STUB to create the + files associated with the CPU controller cgroup but most of the + controls do nothing. This is useful for working in environments and + with applications that will only work if this control group is + present. -if CGROUP_SCHED +if CGROUP_SCHED && !SCHED_MUQSS config FAIR_GROUP_SCHED bool "Group scheduling for SCHED_OTHER" depends on CGROUP_SCHED @@ -831,6 +877,7 @@ config CGROUP_DEVICE config CGROUP_CPUACCT bool "Simple CPU accounting controller" + depends on !SCHED_MUQSS help Provides a simple controller for monitoring the total CPU consumed by the tasks in a cgroup. @@ -949,6 +996,7 @@ endif # NAMESPACES config SCHED_AUTOGROUP bool "Automatic process group scheduling" + depends on !SCHED_MUQSS select CGROUPS select CGROUP_SCHED select FAIR_GROUP_SCHED @@ -1042,6 +1090,13 @@ config CC_OPTIMIZE_FOR_PERFORMANCE with the "-O2" compiler flag for best performance and most helpful compile-time warnings. +config CC_OPTIMIZE_HARDER + bool "Optimize harder" + help + This option will pass "-O3" to your compiler resulting in a + larger and faster kernel. The more complex optimizations also + increase compilation time and may affect stability. + config CC_OPTIMIZE_FOR_SIZE bool "Optimize for size" help diff --git a/init/main.c b/init/main.c index 052481fbe3633f64..6c4c372248338585 100644 --- a/init/main.c +++ b/init/main.c @@ -832,7 +832,6 @@ int __init_or_module do_one_initcall(initcall_t fn) return ret; } - extern initcall_t __initcall_start[]; extern initcall_t __initcall0_start[]; extern initcall_t __initcall1_start[]; @@ -992,6 +991,8 @@ static int __ref kernel_init(void *unused) rcu_end_inkernel_boot(); + print_scheduler_version(); + if (ramdisk_execute_command) { ret = run_init_process(ramdisk_execute_command); if (!ret) diff --git a/kernel/Makefile b/kernel/Makefile index 4cb8e8b23c6ecbcf..3fce4ce700916b56 100644 --- a/kernel/Makefile +++ b/kernel/Makefile @@ -9,7 +9,7 @@ obj-y = fork.o exec_domain.o panic.o \ extable.o params.o \ kthread.o sys_ni.o nsproxy.o \ notifier.o ksysfs.o cred.o reboot.o \ - async.o range.o smpboot.o ucount.o + async.o range.o smpboot.o ucount.o skip_list.o obj-$(CONFIG_MULTIUSER) += groups.o diff --git a/kernel/delayacct.c b/kernel/delayacct.c index 4a1c33416b6a2daa..e9ffeea9d4684a25 100644 --- a/kernel/delayacct.c +++ b/kernel/delayacct.c @@ -106,7 +106,7 @@ int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk) */ t1 = tsk->sched_info.pcount; t2 = tsk->sched_info.run_delay; - t3 = tsk->se.sum_exec_runtime; + t3 = tsk_seruntime(tsk); d->cpu_count += t1; diff --git a/kernel/exit.c b/kernel/exit.c index 135b36985f8a2d9c..c6338050aea8c448 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -129,28 +129,28 @@ static void __exit_signal(struct task_struct *tsk) sig->curr_target = next_thread(tsk); } - add_device_randomness((const void*) &tsk->se.sum_exec_runtime, + add_device_randomness((const void*) &tsk_seruntime(tsk), sizeof(unsigned long long)); /* * Accumulate here the counters for all threads as they die. We could * skip the group leader because it is the last user of signal_struct, * but we want to avoid the race with thread_group_cputime() which can * see the empty ->thread_head list. */ task_cputime(tsk, &utime, &stime); write_seqlock(&sig->stats_lock); sig->utime += utime; sig->stime += stime; sig->gtime += task_gtime(tsk); sig->min_flt += tsk->min_flt; sig->maj_flt += tsk->maj_flt; sig->nvcsw += tsk->nvcsw; sig->nivcsw += tsk->nivcsw; sig->inblock += task_io_get_inblock(tsk); sig->oublock += task_io_get_oublock(tsk); task_io_accounting_add(&sig->ioac, &tsk->ioac); - sig->sum_sched_runtime += tsk->se.sum_exec_runtime; + sig->sum_sched_runtime += tsk_seruntime(tsk); sig->nr_threads--; __unhash_process(tsk, group_dead); write_sequnlock(&sig->stats_lock); diff --git a/kernel/kthread.c b/kernel/kthread.c index 1c19edf824272db4..a0f227768dfc09e3 100644 --- a/kernel/kthread.c +++ b/kernel/kthread.c @@ -403,28 +403,56 @@ void kthread_bind(struct task_struct *p, unsigned int cpu) } EXPORT_SYMBOL(kthread_bind); +#if defined(CONFIG_SCHED_MUQSS) && defined(CONFIG_SMP) +extern void __do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask); + +/* + * new_kthread_bind is a special variant of __kthread_bind_mask. + * For new threads to work on muqss we want to call do_set_cpus_allowed + * without the task_cpu being set and the task rescheduled until they're + * rescheduled on their own so we call __do_set_cpus_allowed directly which + * only changes the cpumask. This is particularly important for smpboot threads + * to work. + */ +static void new_kthread_bind(struct task_struct *p, unsigned int cpu) +{ + unsigned long flags; + + if (WARN_ON(!wait_task_inactive(p, TASK_UNINTERRUPTIBLE))) + return; + + /* It's safe because the task is inactive. */ + raw_spin_lock_irqsave(&p->pi_lock, flags); + __do_set_cpus_allowed(p, cpumask_of(cpu)); + p->flags |= PF_NO_SETAFFINITY; + raw_spin_unlock_irqrestore(&p->pi_lock, flags); +} +#else +#define new_kthread_bind(p, cpu) kthread_bind(p, cpu) +#endif + /** * kthread_create_on_cpu - Create a cpu bound kthread * @threadfn: the function to run until signal_pending(current). * @data: data ptr for @threadfn. * @cpu: The cpu on which the thread should be bound, * @namefmt: printf-style name for the thread. Format is restricted * to "name.*%u". Code fills in cpu number. * * Description: This helper function creates and names a kernel thread * The thread will be woken and put into park mode. */ struct task_struct *kthread_create_on_cpu(int (*threadfn)(void *data), void *data, unsigned int cpu, const char *namefmt) { struct task_struct *p; p = kthread_create_on_node(threadfn, data, cpu_to_node(cpu), namefmt, cpu); if (IS_ERR(p)) return p; - kthread_bind(p, cpu); + new_kthread_bind(p, cpu); /* CPU hotplug need to bind once again when unparking the thread. */ set_bit(KTHREAD_IS_PER_CPU, &to_kthread(p)->flags); to_kthread(p)->cpu = cpu; diff --git a/kernel/livepatch/transition.c b/kernel/livepatch/transition.c index b004a1fb603236f3..ac22ea5f8ae0fdaa 100644 --- a/kernel/livepatch/transition.c +++ b/kernel/livepatch/transition.c @@ -277,15 +277,21 @@ static int klp_check_stack(struct task_struct *task, char *err_buf) return 0; } +#ifdef CONFIG_SCHED_MUQSS +typedef unsigned long rq_flags_t; +#else +typedef struct rq_flags rq_flag_t; +#endif + /* * Try to safely switch a task to the target patch state. If it's currently * running, or it's sleeping on a to-be-patched or to-be-unpatched function, or * if the stack is unreliable, return false. */ static bool klp_try_switch_task(struct task_struct *task) { struct rq *rq; - struct rq_flags flags; + rq_flags_t flags; int ret; bool success = false; char err_buf[STACK_ERR_BUF_SIZE]; diff --git a/kernel/rcu/Kconfig b/kernel/rcu/Kconfig index be90c945063f46b7..9a18f7e72d6619e0 100644 --- a/kernel/rcu/Kconfig +++ b/kernel/rcu/Kconfig @@ -94,7 +94,7 @@ config CONTEXT_TRACKING config CONTEXT_TRACKING_FORCE bool "Force context tracking" depends on CONTEXT_TRACKING - default y if !NO_HZ_FULL + default y if !NO_HZ_FULL && !SCHED_MUQSS help The major pre-requirement for full dynticks to work is to support the context tracking subsystem. But there are also diff --git a/kernel/sched/Makefile b/kernel/sched/Makefile index 53f0164ed362dd91..bc5cbe48af25fe14 100644 --- a/kernel/sched/Makefile +++ b/kernel/sched/Makefile @@ -15,13 +15,19 @@ ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y) CFLAGS_core.o := $(PROFILING) -fno-omit-frame-pointer endif -obj-y += core.o loadavg.o clock.o cputime.o +ifdef CONFIG_SCHED_MUQSS +obj-y += MuQSS.o clock.o +else +obj-y += core.o loadavg.o clock.o obj-y += idle_task.o fair.o rt.o deadline.o -obj-y += wait.o wait_bit.o swait.o completion.o idle.o -obj-$(CONFIG_SMP) += cpupri.o cpudeadline.o topology.o stop_task.o +obj-$(CONFIG_SMP) += cpudeadline.o stop_task.o obj-$(CONFIG_SCHED_AUTOGROUP) += autogroup.o -obj-$(CONFIG_SCHEDSTATS) += stats.o obj-$(CONFIG_SCHED_DEBUG) += debug.o obj-$(CONFIG_CGROUP_CPUACCT) += cpuacct.o +endif +obj-y += cputime.o +obj-y += wait.o wait_bit.o swait.o completion.o idle.o +obj-$(CONFIG_SMP) += cpupri.o topology.o +obj-$(CONFIG_SCHEDSTATS) += stats.o obj-$(CONFIG_CPU_FREQ) += cpufreq.o obj-$(CONFIG_CPU_FREQ_GOV_SCHEDUTIL) += cpufreq_schedutil.o diff --git a/kernel/sched/MuQSS.c b/kernel/sched/MuQSS.c new file mode 100644 index 0000000000000000..7188b12a37e029b7 --- /dev/null +++ b/kernel/sched/MuQSS.c @@ -0,0 +1,6855 @@ +/* + * kernel/sched/MuQSS.c, was kernel/sched.c + * + * Kernel scheduler and related syscalls + * + * Copyright (C) 1991-2002 Linus Torvalds + * + * 1996-12-23 Modified by Dave Grothe to fix bugs in semaphores and + * make semaphores SMP safe + * 1998-11-19 Implemented schedule_timeout() and related stuff + * by Andrea Arcangeli + * 2002-01-04 New ultra-scalable O(1) scheduler by Ingo Molnar: + * hybrid priority-list and round-robin design with + * an array-switch method of distributing timeslices + * and per-CPU runqueues. Cleanups and useful suggestions + * by Davide Libenzi, preemptible kernel bits by Robert Love. + * 2003-09-03 Interactivity tuning by Con Kolivas. + * 2004-04-02 Scheduler domains code by Nick Piggin + * 2007-04-15 Work begun on replacing all interactivity tuning with a + * fair scheduling design by Con Kolivas. + * 2007-05-05 Load balancing (smp-nice) and other improvements + * by Peter Williams + * 2007-05-06 Interactivity improvements to CFS by Mike Galbraith + * 2007-07-01 Group scheduling enhancements by Srivatsa Vaddagiri + * 2007-11-29 RT balancing improvements by Steven Rostedt, Gregory Haskins, + * Thomas Gleixner, Mike Kravetz + * 2009-08-13 Brainfuck deadline scheduling policy by Con Kolivas deletes + * a whole lot of those previous things. + * 2016-10-01 Multiple Queue Skiplist Scheduler scalable evolution of BFS + * scheduler by Con Kolivas. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#ifdef CONFIG_PARAVIRT +#include +#endif + +#include "../workqueue_internal.h" +#include "../smpboot.h" + +#define CREATE_TRACE_POINTS +#include + +#include "MuQSS.h" + +#define rt_prio(prio) unlikely((prio) < MAX_RT_PRIO) +#define rt_task(p) rt_prio((p)->prio) +#define batch_task(p) (unlikely((p)->policy == SCHED_BATCH)) +#define is_rt_policy(policy) ((policy) == SCHED_FIFO || \ + (policy) == SCHED_RR) +#define has_rt_policy(p) unlikely(is_rt_policy((p)->policy)) + +#define is_idle_policy(policy) ((policy) == SCHED_IDLEPRIO) +#define idleprio_task(p) unlikely(is_idle_policy((p)->policy)) +#define task_running_idle(p) unlikely((p)->prio == IDLE_PRIO) + +#define is_iso_policy(policy) ((policy) == SCHED_ISO) +#define iso_task(p) unlikely(is_iso_policy((p)->policy)) +#define task_running_iso(p) unlikely((p)->prio == ISO_PRIO) + +#define rq_idle(rq) ((rq)->rq_prio == PRIO_LIMIT) + +#define ISO_PERIOD (5 * HZ) + +#define STOP_PRIO (MAX_RT_PRIO - 1) + +/* + * Some helpers for converting to/from various scales. Use shifts to get + * approximate multiples of ten for less overhead. + */ +#define JIFFIES_TO_NS(TIME) ((TIME) * (1073741824 / HZ)) +#define JIFFY_NS (1073741824 / HZ) +#define JIFFY_US (1048576 / HZ) +#define NS_TO_JIFFIES(TIME) ((TIME) / JIFFY_NS) +#define HALF_JIFFY_NS (1073741824 / HZ / 2) +#define HALF_JIFFY_US (1048576 / HZ / 2) +#define MS_TO_NS(TIME) ((TIME) << 20) +#define MS_TO_US(TIME) ((TIME) << 10) +#define NS_TO_MS(TIME) ((TIME) >> 20) +#define NS_TO_US(TIME) ((TIME) >> 10) +#define US_TO_NS(TIME) ((TIME) << 10) + +#define RESCHED_US (100) /* Reschedule if less than this many μs left */ + +void print_scheduler_version(void) +{ + printk(KERN_INFO "MuQSS CPU scheduler v0.161 by Con Kolivas.\n"); +} + +/* + * This is the time all tasks within the same priority round robin. + * Value is in ms and set to a minimum of 6ms. + * Tunable via /proc interface. + */ +#ifdef CONFIG_PCK_INTERACTIVE +int rr_interval __read_mostly = 3; +#else +int rr_interval __read_mostly = 6; +#endif + +/* + * Tunable to choose whether to prioritise latency or throughput, simple + * binary yes or no + */ +int sched_interactive __read_mostly = 1; + +/* + * sched_iso_cpu - sysctl which determines the cpu percentage SCHED_ISO tasks + * are allowed to run five seconds as real time tasks. This is the total over + * all online cpus. + */ +#ifdef CONFIG_PCK_INTERACTIVE +int sched_iso_cpu __read_mostly = 25; +#else +int sched_iso_cpu __read_mostly = 70; +#endif + +/* + * sched_yield_type - Choose what sort of yield sched_yield will perform. + * 0: No yield. + * 1: Yield only to better priority/deadline tasks. (default) + * 2: Expire timeslice and recalculate deadline. + */ +int sched_yield_type __read_mostly = 1; + +/* + * The relative length of deadline for each priority(nice) level. + */ +static int prio_ratios[NICE_WIDTH] __read_mostly; + +/* + * The quota handed out to tasks of all priority levels when refilling their + * time_slice. + */ +static inline int timeslice(void) +{ + return MS_TO_US(rr_interval); +} + +#ifdef CONFIG_SMP +static cpumask_t cpu_idle_map ____cacheline_aligned_in_smp; +#endif + +/* CPUs with isolated domains */ +cpumask_var_t cpu_isolated_map; + +DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues); +#ifdef CONFIG_SMP +struct rq *cpu_rq(int cpu) +{ + return &per_cpu(runqueues, (cpu)); +} +#define cpu_curr(cpu) (cpu_rq(cpu)->curr) + +/* + * For asym packing, by default the lower numbered cpu has higher priority. + */ +int __weak arch_asym_cpu_priority(int cpu) +{ + return -cpu; +} + +int __weak arch_sd_sibling_asym_packing(void) +{ + return 0*SD_ASYM_PACKING; +} +#else +struct rq *uprq; +#endif /* CONFIG_SMP */ + +#ifdef CONFIG_SMP +static inline int cpu_of(struct rq *rq) +{ + return rq->cpu; +} +#else /* CONFIG_SMP */ +static inline int cpu_of(struct rq *rq) +{ + return 0; +} +#endif + +#include "stats.h" + +#ifndef prepare_arch_switch +# define prepare_arch_switch(next) do { } while (0) +#endif +#ifndef finish_arch_switch +# define finish_arch_switch(prev) do { } while (0) +#endif +#ifndef finish_arch_post_lock_switch +# define finish_arch_post_lock_switch() do { } while (0) +#endif + +/* + * All common locking functions performed on rq->lock. rq->clock is local to + * the CPU accessing it so it can be modified just with interrupts disabled + * when we're not updating niffies. + * Looking up task_rq must be done under rq->lock to be safe. + */ + +/* + * RQ-clock updating methods: + */ + +static void update_rq_clock_task(struct rq *rq, s64 delta) +{ +/* + * In theory, the compile should just see 0 here, and optimize out the call + * to sched_rt_avg_update. But I don't trust it... + */ +#ifdef CONFIG_IRQ_TIME_ACCOUNTING + s64 irq_delta = irq_time_read(cpu_of(rq)) - rq->prev_irq_time; + + /* + * Since irq_time is only updated on {soft,}irq_exit, we might run into + * this case when a previous update_rq_clock() happened inside a + * {soft,}irq region. + * + * When this happens, we stop ->clock_task and only update the + * prev_irq_time stamp to account for the part that fit, so that a next + * update will consume the rest. This ensures ->clock_task is + * monotonic. + * + * It does however cause some slight miss-attribution of {soft,}irq + * time, a more accurate solution would be to update the irq_time using + * the current rq->clock timestamp, except that would require using + * atomic ops. + */ + if (irq_delta > delta) + irq_delta = delta; + + rq->prev_irq_time += irq_delta; + delta -= irq_delta; +#endif +#ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING + if (static_key_false((¶virt_steal_rq_enabled))) { + s64 steal = paravirt_steal_clock(cpu_of(rq)); + + steal -= rq->prev_steal_time_rq; + + if (unlikely(steal > delta)) + steal = delta; + + rq->prev_steal_time_rq += steal; + + delta -= steal; + } +#endif + rq->clock_task += delta; +} + +static inline void update_rq_clock(struct rq *rq) +{ + s64 delta = sched_clock_cpu(cpu_of(rq)) - rq->clock; + + if (unlikely(delta < 0)) + return; + rq->clock += delta; + update_rq_clock_task(rq, delta); +} + +/* + * Niffies are a globally increasing nanosecond counter. They're only used by + * update_load_avg and time_slice_expired, however deadlines are based on them + * across CPUs. Update them whenever we will call one of those functions, and + * synchronise them across CPUs whenever we hold both runqueue locks. + */ +static inline void update_clocks(struct rq *rq) +{ + s64 ndiff, minndiff; + long jdiff; + + update_rq_clock(rq); + ndiff = rq->clock - rq->old_clock; + rq->old_clock = rq->clock; + jdiff = jiffies - rq->last_jiffy; + + /* Subtract any niffies added by balancing with other rqs */ + ndiff -= rq->niffies - rq->last_niffy; + minndiff = JIFFIES_TO_NS(jdiff) - rq->niffies + rq->last_jiffy_niffies; + if (minndiff < 0) + minndiff = 0; + ndiff = max(ndiff, minndiff); + rq->niffies += ndiff; + rq->last_niffy = rq->niffies; + if (jdiff) { + rq->last_jiffy += jdiff; + rq->last_jiffy_niffies = rq->niffies; + } +} + +static inline int task_on_rq_queued(struct task_struct *p) +{ + return p->on_rq == TASK_ON_RQ_QUEUED; +} + +static inline int task_on_rq_migrating(struct task_struct *p) +{ + return p->on_rq == TASK_ON_RQ_MIGRATING; +} + +static inline int rq_trylock(struct rq *rq) + __acquires(rq->lock) +{ + return raw_spin_trylock(&rq->lock); +} + +/* + * Any time we have two runqueues locked we use that as an opportunity to + * synchronise niffies to the highest value as idle ticks may have artificially + * kept niffies low on one CPU and the truth can only be later. + */ +static inline void synchronise_niffies(struct rq *rq1, struct rq *rq2) +{ + if (rq1->niffies > rq2->niffies) + rq2->niffies = rq1->niffies; + else + rq1->niffies = rq2->niffies; +} + +/* + * double_rq_lock - safely lock two runqueues + * + * Note this does not disable interrupts like task_rq_lock, + * you need to do so manually before calling. + */ + +/* For when we know rq1 != rq2 */ +static inline void __double_rq_lock(struct rq *rq1, struct rq *rq2) + __acquires(rq1->lock) + __acquires(rq2->lock) +{ + if (rq1 < rq2) { + raw_spin_lock(&rq1->lock); + raw_spin_lock_nested(&rq2->lock, SINGLE_DEPTH_NESTING); + } else { + raw_spin_lock(&rq2->lock); + raw_spin_lock_nested(&rq1->lock, SINGLE_DEPTH_NESTING); + } +} + +static inline void double_rq_lock(struct rq *rq1, struct rq *rq2) + __acquires(rq1->lock) + __acquires(rq2->lock) +{ + BUG_ON(!irqs_disabled()); + if (rq1 == rq2) { + raw_spin_lock(&rq1->lock); + __acquire(rq2->lock); /* Fake it out ;) */ + } else + __double_rq_lock(rq1, rq2); + synchronise_niffies(rq1, rq2); +} + +/* + * double_rq_unlock - safely unlock two runqueues + * + * Note this does not restore interrupts like task_rq_unlock, + * you need to do so manually after calling. + */ +static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2) + __releases(rq1->lock) + __releases(rq2->lock) +{ + raw_spin_unlock(&rq1->lock); + if (rq1 != rq2) + raw_spin_unlock(&rq2->lock); + else + __release(rq2->lock); +} + +static inline void lock_all_rqs(void) +{ + int cpu; + + preempt_disable(); + for_each_possible_cpu(cpu) { + struct rq *rq = cpu_rq(cpu); + + do_raw_spin_lock(&rq->lock); + } +} + +static inline void unlock_all_rqs(void) +{ + int cpu; + + for_each_possible_cpu(cpu) { + struct rq *rq = cpu_rq(cpu); + + do_raw_spin_unlock(&rq->lock); + } + preempt_enable(); +} + +/* Specially nest trylock an rq */ +static inline bool trylock_rq(struct rq *this_rq, struct rq *rq) +{ + if (unlikely(!do_raw_spin_trylock(&rq->lock))) + return false; + spin_acquire(&rq->lock.dep_map, SINGLE_DEPTH_NESTING, 1, _RET_IP_); + synchronise_niffies(this_rq, rq); + return true; +} + +/* Unlock a specially nested trylocked rq */ +static inline void unlock_rq(struct rq *rq) +{ + spin_release(&rq->lock.dep_map, 1, _RET_IP_); + do_raw_spin_unlock(&rq->lock); +} + +/* + * cmpxchg based fetch_or, macro so it works for different integer types + */ +#define fetch_or(ptr, mask) \ + ({ \ + typeof(ptr) _ptr = (ptr); \ + typeof(mask) _mask = (mask); \ + typeof(*_ptr) _old, _val = *_ptr; \ + \ + for (;;) { \ + _old = cmpxchg(_ptr, _val, _val | _mask); \ + if (_old == _val) \ + break; \ + _val = _old; \ + } \ + _old; \ +}) + +#if defined(CONFIG_SMP) && defined(TIF_POLLING_NRFLAG) +/* + * Atomically set TIF_NEED_RESCHED and test for TIF_POLLING_NRFLAG, + * this avoids any races wrt polling state changes and thereby avoids + * spurious IPIs. + */ +static bool set_nr_and_not_polling(struct task_struct *p) +{ + struct thread_info *ti = task_thread_info(p); + return !(fetch_or(&ti->flags, _TIF_NEED_RESCHED) & _TIF_POLLING_NRFLAG); +} + +/* + * Atomically set TIF_NEED_RESCHED if TIF_POLLING_NRFLAG is set. + * + * If this returns true, then the idle task promises to call + * sched_ttwu_pending() and reschedule soon. + */ +static bool set_nr_if_polling(struct task_struct *p) +{ + struct thread_info *ti = task_thread_info(p); + typeof(ti->flags) old, val = READ_ONCE(ti->flags); + + for (;;) { + if (!(val & _TIF_POLLING_NRFLAG)) + return false; + if (val & _TIF_NEED_RESCHED) + return true; + old = cmpxchg(&ti->flags, val, val | _TIF_NEED_RESCHED); + if (old == val) + break; + val = old; + } + return true; +} + +#else +static bool set_nr_and_not_polling(struct task_struct *p) +{ + set_tsk_need_resched(p); + return true; +} + +#ifdef CONFIG_SMP +static bool set_nr_if_polling(struct task_struct *p) +{ + return false; +} +#endif +#endif + +void wake_q_add(struct wake_q_head *head, struct task_struct *task) +{ + struct wake_q_node *node = &task->wake_q; + + /* + * Atomically grab the task, if ->wake_q is !nil already it means + * its already queued (either by us or someone else) and will get the + * wakeup due to that. + * + * This cmpxchg() implies a full barrier, which pairs with the write + * barrier implied by the wakeup in wake_up_q(). + */ + if (cmpxchg(&node->next, NULL, WAKE_Q_TAIL)) + return; + + get_task_struct(task); + + /* + * The head is context local, there can be no concurrency. + */ + *head->lastp = node; + head->lastp = &node->next; +} + +void wake_up_q(struct wake_q_head *head) +{ + struct wake_q_node *node = head->first; + + while (node != WAKE_Q_TAIL) { + struct task_struct *task; + + task = container_of(node, struct task_struct, wake_q); + BUG_ON(!task); + /* Task can safely be re-inserted now */ + node = node->next; + task->wake_q.next = NULL; + + /* + * wake_up_process() implies a wmb() to pair with the queueing + * in wake_q_add() so as not to miss wakeups. + */ + wake_up_process(task); + put_task_struct(task); + } +} + +static inline void prepare_lock_switch(struct rq *rq, struct task_struct *next) +{ + next->on_cpu = 1; +} + +static inline void smp_sched_reschedule(int cpu) +{ + if (likely(cpu_online(cpu))) + smp_send_reschedule(cpu); +} + +/* + * resched_task - mark a task 'to be rescheduled now'. + * + * On UP this means the setting of the need_resched flag, on SMP it + * might also involve a cross-CPU call to trigger the scheduler on + * the target CPU. + */ +void resched_task(struct task_struct *p) +{ + int cpu; +#ifdef CONFIG_LOCKDEP + struct rq *rq = task_rq(p); + + lockdep_assert_held(&rq->lock); +#endif + if (test_tsk_need_resched(p)) + return; + + cpu = task_cpu(p); + if (cpu == smp_processor_id()) { + set_tsk_need_resched(p); + set_preempt_need_resched(); + return; + } + + if (set_nr_and_not_polling(p)) + smp_sched_reschedule(cpu); + else + trace_sched_wake_idle_without_ipi(cpu); +} + +/* + * A task that is not running or queued will not have a node set. + * A task that is queued but not running will have a node set. + * A task that is currently running will have ->on_cpu set but no node set. + */ +static inline bool task_queued(struct task_struct *p) +{ + return !skiplist_node_empty(&p->node); +} + +static void enqueue_task(struct rq *rq, struct task_struct *p, int flags); +static inline void resched_if_idle(struct rq *rq); + +/* Dodgy workaround till we figure out where the softirqs are going */ +static inline void do_pending_softirq(struct rq *rq, struct task_struct *next) +{ + if (unlikely(next == rq->idle && local_softirq_pending() && !in_interrupt())) + do_softirq_own_stack(); +} + +static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev) +{ +#ifdef CONFIG_SMP + /* + * After ->on_cpu is cleared, the task can be moved to a different CPU. + * We must ensure this doesn't happen until the switch is completely + * finished. + * + * In particular, the load of prev->state in finish_task_switch() must + * happen before this. + * + * Pairs with the smp_cond_load_acquire() in try_to_wake_up(). + */ + smp_store_release(&prev->on_cpu, 0); +#endif +#ifdef CONFIG_DEBUG_SPINLOCK + /* this is a valid case when another task releases the spinlock */ + rq->lock.owner = current; +#endif + /* + * If we are tracking spinlock dependencies then we have to + * fix up the runqueue lock - which gets 'carried over' from + * prev into current: + */ + spin_acquire(&rq->lock.dep_map, 0, 0, _THIS_IP_); + +#ifdef CONFIG_SMP + /* + * If prev was marked as migrating to another CPU in return_task, drop + * the local runqueue lock but leave interrupts disabled and grab the + * remote lock we're migrating it to before enabling them. + */ + if (unlikely(task_on_rq_migrating(prev))) { + sched_info_dequeued(rq, prev); + /* + * We move the ownership of prev to the new cpu now. ttwu can't + * activate prev to the wrong cpu since it has to grab this + * runqueue in ttwu_remote. + */ +#ifdef CONFIG_THREAD_INFO_IN_TASK + prev->cpu = prev->wake_cpu; +#else + task_thread_info(prev)->cpu = prev->wake_cpu; +#endif + raw_spin_unlock(&rq->lock); + + raw_spin_lock(&prev->pi_lock); + rq = __task_rq_lock(prev); + /* Check that someone else hasn't already queued prev */ + if (likely(!task_queued(prev))) { + enqueue_task(rq, prev, 0); + prev->on_rq = TASK_ON_RQ_QUEUED; + /* Wake up the CPU if it's not already running */ + resched_if_idle(rq); + } + raw_spin_unlock(&prev->pi_lock); + } +#endif + /* Accurately set nr_running here for load average calculations */ + rq->nr_running = rq->sl->entries + !rq_idle(rq); + rq_unlock(rq); + + do_pending_softirq(rq, current); + + local_irq_enable(); +} + +static inline bool deadline_before(u64 deadline, u64 time) +{ + return (deadline < time); +} + +/* + * Deadline is "now" in niffies + (offset by priority). Setting the deadline + * is the key to everything. It distributes cpu fairly amongst tasks of the + * same nice value, it proportions cpu according to nice level, it means the + * task that last woke up the longest ago has the earliest deadline, thus + * ensuring that interactive tasks get low latency on wake up. The CPU + * proportion works out to the square of the virtual deadline difference, so + * this equation will give nice 19 3% CPU compared to nice 0. + */ +static inline u64 prio_deadline_diff(int user_prio) +{ + return (prio_ratios[user_prio] * rr_interval * (MS_TO_NS(1) / 128)); +} + +static inline u64 task_deadline_diff(struct task_struct *p) +{ + return prio_deadline_diff(TASK_USER_PRIO(p)); +} + +static inline u64 static_deadline_diff(int static_prio) +{ + return prio_deadline_diff(USER_PRIO(static_prio)); +} + +static inline int longest_deadline_diff(void) +{ + return prio_deadline_diff(39); +} + +static inline int ms_longest_deadline_diff(void) +{ + return NS_TO_MS(longest_deadline_diff()); +} + +static inline bool rq_local(struct rq *rq); + +#ifndef SCHED_CAPACITY_SCALE +#define SCHED_CAPACITY_SCALE 1024 +#endif + +static inline int rq_load(struct rq *rq) +{ + return rq->nr_running; +} + +/* + * Update the load average for feeding into cpu frequency governors. Use a + * rough estimate of a rolling average with ~ time constant of 32ms. + * 80/128 ~ 0.63. * 80 / 32768 / 128 == * 5 / 262144 + * Make sure a call to update_clocks has been made before calling this to get + * an updated rq->niffies. + */ +static void update_load_avg(struct rq *rq, unsigned int flags) +{ + unsigned long us_interval, curload; + long load; + + if (unlikely(rq->niffies <= rq->load_update)) + return; + + us_interval = NS_TO_US(rq->niffies - rq->load_update); + curload = rq_load(rq); + load = rq->load_avg - (rq->load_avg * us_interval * 5 / 262144); + if (unlikely(load < 0)) + load = 0; + load += curload * curload * SCHED_CAPACITY_SCALE * us_interval * 5 / 262144; + rq->load_avg = load; + + rq->load_update = rq->niffies; + if (likely(rq_local(rq))) + cpufreq_trigger(rq->niffies, flags); +} + +/* + * Removing from the runqueue. Enter with rq locked. Deleting a task + * from the skip list is done via the stored node reference in the task struct + * and does not require a full look up. Thus it occurs in O(k) time where k + * is the "level" of the list the task was stored at - usually < 4, max 8. + */ +static void dequeue_task(struct rq *rq, struct task_struct *p, int flags) +{ + skiplist_delete(rq->sl, &p->node); + rq->best_key = rq->node.next[0]->key; + update_clocks(rq); + + if (!(flags & DEQUEUE_SAVE)) + sched_info_dequeued(task_rq(p), p); + update_load_avg(rq, flags); +} + +#ifdef CONFIG_PREEMPT_RCU +static bool rcu_read_critical(struct task_struct *p) +{ + return p->rcu_read_unlock_special.b.blocked; +} +#else /* CONFIG_PREEMPT_RCU */ +#define rcu_read_critical(p) (false) +#endif /* CONFIG_PREEMPT_RCU */ + +/* + * To determine if it's safe for a task of SCHED_IDLEPRIO to actually run as + * an idle task, we ensure none of the following conditions are met. + */ +static bool idleprio_suitable(struct task_struct *p) +{ + return (!(task_contributes_to_load(p)) && !(p->flags & (PF_EXITING)) && + !signal_pending(p) && !rcu_read_critical(p) && !freezing(p)); +} + +/* + * To determine if a task of SCHED_ISO can run in pseudo-realtime, we check + * that the iso_refractory flag is not set. + */ +static inline bool isoprio_suitable(struct rq *rq) +{ + return !rq->iso_refractory; +} + +/* + * Adding to the runqueue. Enter with rq locked. + */ +static void enqueue_task(struct rq *rq, struct task_struct *p, int flags) +{ + unsigned int randseed, cflags = 0; + u64 sl_id; + + if (!rt_task(p)) { + /* Check it hasn't gotten rt from PI */ + if ((idleprio_task(p) && idleprio_suitable(p)) || + (iso_task(p) && isoprio_suitable(rq))) + p->prio = p->normal_prio; + else + p->prio = NORMAL_PRIO; + } + /* + * The sl_id key passed to the skiplist generates a sorted list. + * Realtime and sched iso tasks run FIFO so they only need be sorted + * according to priority. The skiplist will put tasks of the same + * key inserted later in FIFO order. Tasks of sched normal, batch + * and idleprio are sorted according to their deadlines. Idleprio + * tasks are offset by an impossibly large deadline value ensuring + * they get sorted into last positions, but still according to their + * own deadlines. This creates a "landscape" of skiplists running + * from priority 0 realtime in first place to the lowest priority + * idleprio tasks last. Skiplist insertion is an O(log n) process. + */ + if (p->prio <= ISO_PRIO) { + sl_id = p->prio; + cflags = SCHED_CPUFREQ_RT; + } else { + sl_id = p->deadline; + if (idleprio_task(p)) { + if (p->prio == IDLE_PRIO) + sl_id |= 0xF000000000000000; + else + sl_id += longest_deadline_diff(); + } + } + /* + * Some architectures don't have better than microsecond resolution + * so mask out ~microseconds as the random seed for skiplist insertion. + */ + update_clocks(rq); + if (!(flags & ENQUEUE_RESTORE)) + sched_info_queued(rq, p); + randseed = (rq->niffies >> 10) & 0xFFFFFFFF; + skiplist_insert(rq->sl, &p->node, sl_id, p, randseed); + rq->best_key = rq->node.next[0]->key; + if (p->in_iowait) + cflags |= SCHED_CPUFREQ_IOWAIT; + update_load_avg(rq, cflags); +} + +/* + * Returns the relative length of deadline all compared to the shortest + * deadline which is that of nice -20. + */ +static inline int task_prio_ratio(struct task_struct *p) +{ + return prio_ratios[TASK_USER_PRIO(p)]; +} + +/* + * task_timeslice - all tasks of all priorities get the exact same timeslice + * length. CPU distribution is handled by giving different deadlines to + * tasks of different priorities. Use 128 as the base value for fast shifts. + */ +static inline int task_timeslice(struct task_struct *p) +{ + return (rr_interval * task_prio_ratio(p) / 128); +} + +#ifdef CONFIG_SMP +/* Entered with rq locked */ +static inline void resched_if_idle(struct rq *rq) +{ + if (rq_idle(rq)) + resched_task(rq->curr); +} + +static inline bool rq_local(struct rq *rq) +{ + return (rq->cpu == smp_processor_id()); +} +#ifdef CONFIG_SMT_NICE +static const cpumask_t *thread_cpumask(int cpu); + +/* Find the best real time priority running on any SMT siblings of cpu and if + * none are running, the static priority of the best deadline task running. + * The lookups to the other runqueues is done lockless as the occasional wrong + * value would be harmless. */ +static int best_smt_bias(struct rq *this_rq) +{ + int other_cpu, best_bias = 0; + + for_each_cpu(other_cpu, &this_rq->thread_mask) { + struct rq *rq = cpu_rq(other_cpu); + + if (rq_idle(rq)) + continue; + if (unlikely(!rq->online)) + continue; + if (!rq->rq_mm) + continue; + if (likely(rq->rq_smt_bias > best_bias)) + best_bias = rq->rq_smt_bias; + } + return best_bias; +} + +static int task_prio_bias(struct task_struct *p) +{ + if (rt_task(p)) + return 1 << 30; + else if (task_running_iso(p)) + return 1 << 29; + else if (task_running_idle(p)) + return 0; + return MAX_PRIO - p->static_prio; +} + +static bool smt_always_schedule(struct task_struct __maybe_unused *p, struct rq __maybe_unused *this_rq) +{ + return true; +} + +static bool (*smt_schedule)(struct task_struct *p, struct rq *this_rq) = &smt_always_schedule; + +/* We've already decided p can run on CPU, now test if it shouldn't for SMT + * nice reasons. */ +static bool smt_should_schedule(struct task_struct *p, struct rq *this_rq) +{ + int best_bias, task_bias; + + /* Kernel threads always run */ + if (unlikely(!p->mm)) + return true; + if (rt_task(p)) + return true; + if (!idleprio_suitable(p)) + return true; + best_bias = best_smt_bias(this_rq); + /* The smt siblings are all idle or running IDLEPRIO */ + if (best_bias < 1) + return true; + task_bias = task_prio_bias(p); + if (task_bias < 1) + return false; + if (task_bias >= best_bias) + return true; + /* Dither 25% cpu of normal tasks regardless of nice difference */ + if (best_bias % 4 == 1) + return true; + /* Sorry, you lose */ + return false; +} +#else /* CONFIG_SMT_NICE */ +#define smt_schedule(p, this_rq) (true) +#endif /* CONFIG_SMT_NICE */ + +static inline void atomic_set_cpu(int cpu, cpumask_t *cpumask) +{ + set_bit(cpu, (volatile unsigned long *)cpumask); +} + +/* + * The cpu_idle_map stores a bitmap of all the CPUs currently idle to + * allow easy lookup of whether any suitable idle CPUs are available. + * It's cheaper to maintain a binary yes/no if there are any idle CPUs on the + * idle_cpus variable than to do a full bitmask check when we are busy. The + * bits are set atomically but read locklessly as occasional false positive / + * negative is harmless. + */ +static inline void set_cpuidle_map(int cpu) +{ + if (likely(cpu_online(cpu))) + atomic_set_cpu(cpu, &cpu_idle_map); +} + +static inline void atomic_clear_cpu(int cpu, cpumask_t *cpumask) +{ + clear_bit(cpu, (volatile unsigned long *)cpumask); +} + +static inline void clear_cpuidle_map(int cpu) +{ + atomic_clear_cpu(cpu, &cpu_idle_map); +} + +static bool suitable_idle_cpus(struct task_struct *p) +{ + return (cpumask_intersects(&p->cpus_allowed, &cpu_idle_map)); +} + +/* + * Resched current on rq. We don't know if rq is local to this CPU nor if it + * is locked so we do not use an intermediate variable for the task to avoid + * having it dereferenced. + */ +static void resched_curr(struct rq *rq) +{ + int cpu; + + if (test_tsk_need_resched(rq->curr)) + return; + + rq->preempt = rq->curr; + cpu = rq->cpu; + + /* We're doing this without holding the rq lock if it's not task_rq */ + + if (cpu == smp_processor_id()) { + set_tsk_need_resched(rq->curr); + set_preempt_need_resched(); + return; + } + + if (set_nr_and_not_polling(rq->curr)) + smp_sched_reschedule(cpu); + else + trace_sched_wake_idle_without_ipi(cpu); +} + +#define CPUIDLE_DIFF_THREAD (1) +#define CPUIDLE_DIFF_CORE (2) +#define CPUIDLE_CACHE_BUSY (4) +#define CPUIDLE_DIFF_CPU (8) +#define CPUIDLE_THREAD_BUSY (16) +#define CPUIDLE_DIFF_NODE (32) + +/* + * The best idle CPU is chosen according to the CPUIDLE ranking above where the + * lowest value would give the most suitable CPU to schedule p onto next. The + * order works out to be the following: + * + * Same thread, idle or busy cache, idle or busy threads + * Other core, same cache, idle or busy cache, idle threads. + * Same node, other CPU, idle cache, idle threads. + * Same node, other CPU, busy cache, idle threads. + * Other core, same cache, busy threads. + * Same node, other CPU, busy threads. + * Other node, other CPU, idle cache, idle threads. + * Other node, other CPU, busy cache, idle threads. + * Other node, other CPU, busy threads. + */ +static int best_mask_cpu(int best_cpu, struct rq *rq, cpumask_t *tmpmask) +{ + int best_ranking = CPUIDLE_DIFF_NODE | CPUIDLE_THREAD_BUSY | + CPUIDLE_DIFF_CPU | CPUIDLE_CACHE_BUSY | CPUIDLE_DIFF_CORE | + CPUIDLE_DIFF_THREAD; + int cpu_tmp; + + if (cpumask_test_cpu(best_cpu, tmpmask)) + goto out; + + for_each_cpu(cpu_tmp, tmpmask) { + int ranking, locality; + struct rq *tmp_rq; + + ranking = 0; + tmp_rq = cpu_rq(cpu_tmp); + + locality = rq->cpu_locality[cpu_tmp]; +#ifdef CONFIG_NUMA + if (locality > 3) + ranking |= CPUIDLE_DIFF_NODE; + else +#endif + if (locality > 2) + ranking |= CPUIDLE_DIFF_CPU; +#ifdef CONFIG_SCHED_MC + else if (locality == 2) + ranking |= CPUIDLE_DIFF_CORE; + else if (!(tmp_rq->cache_idle(tmp_rq))) + ranking |= CPUIDLE_CACHE_BUSY; +#endif +#ifdef CONFIG_SCHED_SMT + if (locality == 1) + ranking |= CPUIDLE_DIFF_THREAD; + if (!(tmp_rq->siblings_idle(tmp_rq))) + ranking |= CPUIDLE_THREAD_BUSY; +#endif + if (ranking < best_ranking) { + best_cpu = cpu_tmp; + best_ranking = ranking; + } + } +out: + return best_cpu; +} + +bool cpus_share_cache(int this_cpu, int that_cpu) +{ + struct rq *this_rq = cpu_rq(this_cpu); + + return (this_rq->cpu_locality[that_cpu] < 3); +} + +/* As per resched_curr but only will resched idle task */ +static inline void resched_idle(struct rq *rq) +{ + if (test_tsk_need_resched(rq->idle)) + return; + + rq->preempt = rq->idle; + + set_tsk_need_resched(rq->idle); + + if (rq_local(rq)) { + set_preempt_need_resched(); + return; + } + + smp_sched_reschedule(rq->cpu); +} + +static struct rq *resched_best_idle(struct task_struct *p, int cpu) +{ + cpumask_t tmpmask; + struct rq *rq; + int best_cpu; + + cpumask_and(&tmpmask, &p->cpus_allowed, &cpu_idle_map); + best_cpu = best_mask_cpu(cpu, task_rq(p), &tmpmask); + rq = cpu_rq(best_cpu); + if (!smt_schedule(p, rq)) + return NULL; + rq->preempt = p; + resched_idle(rq); + return rq; +} + +static inline void resched_suitable_idle(struct task_struct *p) +{ + if (suitable_idle_cpus(p)) + resched_best_idle(p, task_cpu(p)); +} + +static inline struct rq *rq_order(struct rq *rq, int cpu) +{ + return rq->rq_order[cpu]; +} +#else /* CONFIG_SMP */ +static inline void set_cpuidle_map(int cpu) +{ +} + +static inline void clear_cpuidle_map(int cpu) +{ +} + +static inline bool suitable_idle_cpus(struct task_struct *p) +{ + return uprq->curr == uprq->idle; +} + +static inline void resched_suitable_idle(struct task_struct *p) +{ +} + +static inline void resched_curr(struct rq *rq) +{ + resched_task(rq->curr); +} + +static inline void resched_if_idle(struct rq *rq) +{ +} + +static inline bool rq_local(struct rq *rq) +{ + return true; +} + +static inline struct rq *rq_order(struct rq *rq, int cpu) +{ + return rq; +} + +static inline bool smt_schedule(struct task_struct *p, struct rq *rq) +{ + return true; +} +#endif /* CONFIG_SMP */ + +static inline int normal_prio(struct task_struct *p) +{ + if (has_rt_policy(p)) + return MAX_RT_PRIO - 1 - p->rt_priority; + if (idleprio_task(p)) + return IDLE_PRIO; + if (iso_task(p)) + return ISO_PRIO; + return NORMAL_PRIO; +} + +/* + * Calculate the current priority, i.e. the priority + * taken into account by the scheduler. This value might + * be boosted by RT tasks as it will be RT if the task got + * RT-boosted. If not then it returns p->normal_prio. + */ +static int effective_prio(struct task_struct *p) +{ + p->normal_prio = normal_prio(p); + /* + * If we are RT tasks or we were boosted to RT priority, + * keep the priority unchanged. Otherwise, update priority + * to the normal priority: + */ + if (!rt_prio(p->prio)) + return p->normal_prio; + return p->prio; +} + +/* + * activate_task - move a task to the runqueue. Enter with rq locked. + */ +static void activate_task(struct task_struct *p, struct rq *rq) +{ + resched_if_idle(rq); + + /* + * Sleep time is in units of nanosecs, so shift by 20 to get a + * milliseconds-range estimation of the amount of time that the task + * spent sleeping: + */ + if (unlikely(prof_on == SLEEP_PROFILING)) { + if (p->state == TASK_UNINTERRUPTIBLE) + profile_hits(SLEEP_PROFILING, (void *)get_wchan(p), + (rq->niffies - p->last_ran) >> 20); + } + + p->prio = effective_prio(p); + if (task_contributes_to_load(p)) + rq->nr_uninterruptible--; + + enqueue_task(rq, p, 0); + p->on_rq = TASK_ON_RQ_QUEUED; +} + +/* + * deactivate_task - If it's running, it's not on the runqueue and we can just + * decrement the nr_running. Enter with rq locked. + */ +static inline void deactivate_task(struct task_struct *p, struct rq *rq) +{ + if (task_contributes_to_load(p)) + rq->nr_uninterruptible++; + + p->on_rq = 0; + sched_info_dequeued(rq, p); +} + +#ifdef CONFIG_SMP +void set_task_cpu(struct task_struct *p, unsigned int cpu) +{ + struct rq *rq; + + if (task_cpu(p) == cpu) + return; + + /* Do NOT call set_task_cpu on a currently queued task as we will not + * be reliably holding the rq lock after changing cpu. */ + BUG_ON(task_queued(p)); + rq = task_rq(p); +#ifdef CONFIG_LOCKDEP + /* + * The caller should hold either p->pi_lock or rq->lock, when changing + * a task's CPU. ->pi_lock for waking tasks, rq->lock for runnable tasks. + * + * Furthermore, all task_rq users should acquire both locks, see + * task_rq_lock(). + */ + WARN_ON_ONCE(debug_locks && !(lockdep_is_held(&p->pi_lock) || + lockdep_is_held(&rq->lock))); +#endif + trace_sched_migrate_task(p, cpu); + perf_event_task_migrate(p); + + /* + * After ->cpu is set up to a new value, task_rq_lock(p, ...) can be + * successfully executed on another CPU. We must ensure that updates of + * per-task data have been completed by this moment. + */ + smp_wmb(); + + p->wake_cpu = cpu; + + if (task_running(rq, p)) { + /* + * We should only be calling this on a running task if we're + * holding rq lock. + */ + lockdep_assert_held(&rq->lock); + + /* + * We can't change the task_thread_info cpu on a running task + * as p will still be protected by the rq lock of the cpu it + * is still running on so we only set the wake_cpu for it to be + * lazily updated once off the cpu. + */ + return; + } + +#ifdef CONFIG_THREAD_INFO_IN_TASK + p->cpu = cpu; +#else + task_thread_info(p)->cpu = cpu; +#endif + /* We're no longer protecting p after this point since we're holding + * the wrong runqueue lock. */ +} +#endif /* CONFIG_SMP */ + +/* + * Move a task off the runqueue and take it to a cpu for it will + * become the running task. + */ +static inline void take_task(struct rq *rq, int cpu, struct task_struct *p) +{ + struct rq *p_rq = task_rq(p); + + dequeue_task(p_rq, p, DEQUEUE_SAVE); + if (p_rq != rq) { + sched_info_dequeued(p_rq, p); + sched_info_queued(rq, p); + } + set_task_cpu(p, cpu); +} + +/* + * Returns a descheduling task to the runqueue unless it is being + * deactivated. + */ +static inline void return_task(struct task_struct *p, struct rq *rq, + int cpu, bool deactivate) +{ + if (deactivate) + deactivate_task(p, rq); + else { +#ifdef CONFIG_SMP + /* + * set_task_cpu was called on the running task that doesn't + * want to deactivate so it has to be enqueued to a different + * CPU and we need its lock. Tag it to be moved with as the + * lock is dropped in finish_lock_switch. + */ + if (unlikely(p->wake_cpu != cpu)) + p->on_rq = TASK_ON_RQ_MIGRATING; + else +#endif + enqueue_task(rq, p, ENQUEUE_RESTORE); + } +} + +/* Enter with rq lock held. We know p is on the local cpu */ +static inline void __set_tsk_resched(struct task_struct *p) +{ + set_tsk_need_resched(p); + set_preempt_need_resched(); +} + +/** + * task_curr - is this task currently executing on a CPU? + * @p: the task in question. + * + * Return: 1 if the task is currently executing. 0 otherwise. + */ +inline int task_curr(const struct task_struct *p) +{ + return cpu_curr(task_cpu(p)) == p; +} + +#ifdef CONFIG_SMP +/* + * wait_task_inactive - wait for a thread to unschedule. + * + * If @match_state is nonzero, it's the @p->state value just checked and + * not expected to change. If it changes, i.e. @p might have woken up, + * then return zero. When we succeed in waiting for @p to be off its CPU, + * we return a positive number (its total switch count). If a second call + * a short while later returns the same number, the caller can be sure that + * @p has remained unscheduled the whole time. + * + * The caller must ensure that the task *will* unschedule sometime soon, + * else this function might spin for a *long* time. This function can't + * be called with interrupts off, or it may introduce deadlock with + * smp_call_function() if an IPI is sent by the same process we are + * waiting to become inactive. + */ +unsigned long wait_task_inactive(struct task_struct *p, long match_state) +{ + int running, queued; + unsigned long flags; + unsigned long ncsw; + struct rq *rq; + + for (;;) { + rq = task_rq(p); + + /* + * If the task is actively running on another CPU + * still, just relax and busy-wait without holding + * any locks. + * + * NOTE! Since we don't hold any locks, it's not + * even sure that "rq" stays as the right runqueue! + * But we don't care, since this will return false + * if the runqueue has changed and p is actually now + * running somewhere else! + */ + while (task_running(rq, p)) { + if (match_state && unlikely(p->state != match_state)) + return 0; + cpu_relax(); + } + + /* + * Ok, time to look more closely! We need the rq + * lock now, to be *sure*. If we're wrong, we'll + * just go back and repeat. + */ + rq = task_rq_lock(p, &flags); + trace_sched_wait_task(p); + running = task_running(rq, p); + queued = task_on_rq_queued(p); + ncsw = 0; + if (!match_state || p->state == match_state) + ncsw = p->nvcsw | LONG_MIN; /* sets MSB */ + task_rq_unlock(rq, p, &flags); + + /* + * If it changed from the expected state, bail out now. + */ + if (unlikely(!ncsw)) + break; + + /* + * Was it really running after all now that we + * checked with the proper locks actually held? + * + * Oops. Go back and try again.. + */ + if (unlikely(running)) { + cpu_relax(); + continue; + } + + /* + * It's not enough that it's not actively running, + * it must be off the runqueue _entirely_, and not + * preempted! + * + * So if it was still runnable (but just not actively + * running right now), it's preempted, and we should + * yield - it could be a while. + */ + if (unlikely(queued)) { + ktime_t to = NSEC_PER_SEC / HZ; + + set_current_state(TASK_UNINTERRUPTIBLE); + schedule_hrtimeout(&to, HRTIMER_MODE_REL); + continue; + } + + /* + * Ahh, all good. It wasn't running, and it wasn't + * runnable, which means that it will never become + * running in the future either. We're all done! + */ + break; + } + + return ncsw; +} + +/*** + * kick_process - kick a running thread to enter/exit the kernel + * @p: the to-be-kicked thread + * + * Cause a process which is running on another CPU to enter + * kernel-mode, without any delay. (to get signals handled.) + * + * NOTE: this function doesn't have to take the runqueue lock, + * because all it wants to ensure is that the remote task enters + * the kernel. If the IPI races and the task has been migrated + * to another CPU then no harm is done and the purpose has been + * achieved as well. + */ +void kick_process(struct task_struct *p) +{ + int cpu; + + preempt_disable(); + cpu = task_cpu(p); + if ((cpu != smp_processor_id()) && task_curr(p)) + smp_sched_reschedule(cpu); + preempt_enable(); +} +EXPORT_SYMBOL_GPL(kick_process); +#endif + +/* + * RT tasks preempt purely on priority. SCHED_NORMAL tasks preempt on the + * basis of earlier deadlines. SCHED_IDLEPRIO don't preempt anything else or + * between themselves, they cooperatively multitask. An idle rq scores as + * prio PRIO_LIMIT so it is always preempted. + */ +static inline bool +can_preempt(struct task_struct *p, int prio, u64 deadline) +{ + /* Better static priority RT task or better policy preemption */ + if (p->prio < prio) + return true; + if (p->prio > prio) + return false; + if (p->policy == SCHED_BATCH) + return false; + /* SCHED_NORMAL and ISO will preempt based on deadline */ + if (!deadline_before(p->deadline, deadline)) + return false; + return true; +} + +#ifdef CONFIG_SMP +/* + * Check to see if p can run on cpu, and if not, whether there are any online + * CPUs it can run on instead. + */ +static inline bool needs_other_cpu(struct task_struct *p, int cpu) +{ + if (unlikely(!cpumask_test_cpu(cpu, &p->cpus_allowed))) + return true; + return false; +} +#define cpu_online_map (*(cpumask_t *)cpu_online_mask) + +static void try_preempt(struct task_struct *p, struct rq *this_rq) +{ + int i, this_entries = rq_load(this_rq); + cpumask_t tmp; + + if (suitable_idle_cpus(p) && resched_best_idle(p, task_cpu(p))) + return; + + /* IDLEPRIO tasks never preempt anything but idle */ + if (p->policy == SCHED_IDLEPRIO) + return; + + cpumask_and(&tmp, &cpu_online_map, &p->cpus_allowed); + + for (i = 0; i < num_possible_cpus(); i++) { + struct rq *rq = this_rq->rq_order[i]; + + if (!cpumask_test_cpu(rq->cpu, &tmp)) + continue; + + if (!sched_interactive && rq != this_rq && rq_load(rq) <= this_entries) + continue; + if (smt_schedule(p, rq) && can_preempt(p, rq->rq_prio, rq->rq_deadline)) { + /* We set rq->preempting lockless, it's a hint only */ + rq->preempting = p; + resched_curr(rq); + return; + } + } +} + +static int __set_cpus_allowed_ptr(struct task_struct *p, + const struct cpumask *new_mask, bool check); +#else /* CONFIG_SMP */ +static inline bool needs_other_cpu(struct task_struct *p, int cpu) +{ + return false; +} + +static void try_preempt(struct task_struct *p, struct rq *this_rq) +{ + if (p->policy == SCHED_IDLEPRIO) + return; + if (can_preempt(p, uprq->rq_prio, uprq->rq_deadline)) + resched_curr(uprq); +} + +static inline int __set_cpus_allowed_ptr(struct task_struct *p, + const struct cpumask *new_mask, bool check) +{ + return set_cpus_allowed_ptr(p, new_mask); +} +#endif /* CONFIG_SMP */ + +/* + * wake flags + */ +#define WF_SYNC 0x01 /* waker goes to sleep after wakeup */ +#define WF_FORK 0x02 /* child wakeup after fork */ +#define WF_MIGRATED 0x04 /* internal use, task got migrated */ + +static void +ttwu_stat(struct task_struct *p, int cpu, int wake_flags) +{ + struct rq *rq; + + if (!schedstat_enabled()) + return; + + rq = this_rq(); + +#ifdef CONFIG_SMP + if (cpu == rq->cpu) + schedstat_inc(rq->ttwu_local); + else { + struct sched_domain *sd; + + rcu_read_lock(); + for_each_domain(rq->cpu, sd) { + if (cpumask_test_cpu(cpu, sched_domain_span(sd))) { + schedstat_inc(sd->ttwu_wake_remote); + break; + } + } + rcu_read_unlock(); + } + +#endif /* CONFIG_SMP */ + + schedstat_inc(rq->ttwu_count); +} + +static inline void ttwu_activate(struct rq *rq, struct task_struct *p) +{ + activate_task(p, rq); + + /* if a worker is waking up, notify the workqueue */ + if (p->flags & PF_WQ_WORKER) + wq_worker_waking_up(p, cpu_of(rq)); +} + +/* + * Mark the task runnable and perform wakeup-preemption. + */ +static void ttwu_do_wakeup(struct rq *rq, struct task_struct *p, int wake_flags) +{ + /* + * Sync wakeups (i.e. those types of wakeups where the waker + * has indicated that it will leave the CPU in short order) + * don't trigger a preemption if there are no idle cpus, + * instead waiting for current to deschedule. + */ + if (wake_flags & WF_SYNC) + resched_suitable_idle(p); + else + try_preempt(p, rq); + p->state = TASK_RUNNING; + trace_sched_wakeup(p); +} + +static void +ttwu_do_activate(struct rq *rq, struct task_struct *p, int wake_flags) +{ + lockdep_assert_held(&rq->lock); + +#ifdef CONFIG_SMP + if (p->sched_contributes_to_load) + rq->nr_uninterruptible--; +#endif + + ttwu_activate(rq, p); + ttwu_do_wakeup(rq, p, wake_flags); +} + +/* + * Called in case the task @p isn't fully descheduled from its runqueue, + * in this case we must do a remote wakeup. Its a 'light' wakeup though, + * since all we need to do is flip p->state to TASK_RUNNING, since + * the task is still ->on_rq. + */ +static int ttwu_remote(struct task_struct *p, int wake_flags) +{ + struct rq *rq; + int ret = 0; + + rq = __task_rq_lock(p); + if (likely(task_on_rq_queued(p))) { + ttwu_do_wakeup(rq, p, wake_flags); + ret = 1; + } + __task_rq_unlock(rq); + + return ret; +} + +#ifdef CONFIG_SMP +void sched_ttwu_pending(void) +{ + struct rq *rq = this_rq(); + struct llist_node *llist = llist_del_all(&rq->wake_list); + struct task_struct *p, *t; + unsigned long flags; + + if (!llist) + return; + + rq_lock_irqsave(rq, &flags); + + llist_for_each_entry_safe(p, t, llist, wake_entry) + ttwu_do_activate(rq, p, 0); + + rq_unlock_irqrestore(rq, &flags); +} + +void scheduler_ipi(void) +{ + /* + * Fold TIF_NEED_RESCHED into the preempt_count; anybody setting + * TIF_NEED_RESCHED remotely (for the first time) will also send + * this IPI. + */ + preempt_fold_need_resched(); + + if (llist_empty(&this_rq()->wake_list) && (!idle_cpu(smp_processor_id()) || need_resched())) + return; + + /* + * Not all reschedule IPI handlers call irq_enter/irq_exit, since + * traditionally all their work was done from the interrupt return + * path. Now that we actually do some work, we need to make sure + * we do call them. + * + * Some archs already do call them, luckily irq_enter/exit nest + * properly. + * + * Arguably we should visit all archs and update all handlers, + * however a fair share of IPIs are still resched only so this would + * somewhat pessimize the simple resched case. + */ + irq_enter(); + sched_ttwu_pending(); + irq_exit(); +} + +static void ttwu_queue_remote(struct task_struct *p, int cpu, int wake_flags) +{ + struct rq *rq = cpu_rq(cpu); + + if (llist_add(&p->wake_entry, &cpu_rq(cpu)->wake_list)) { + if (!set_nr_if_polling(rq->idle)) + smp_sched_reschedule(cpu); + else + trace_sched_wake_idle_without_ipi(cpu); + } +} + +void wake_up_if_idle(int cpu) +{ + struct rq *rq = cpu_rq(cpu); + unsigned long flags; + + rcu_read_lock(); + + if (!is_idle_task(rcu_dereference(rq->curr))) + goto out; + + if (set_nr_if_polling(rq->idle)) { + trace_sched_wake_idle_without_ipi(cpu); + } else { + rq_lock_irqsave(rq, &flags); + if (likely(is_idle_task(rq->curr))) + smp_sched_reschedule(cpu); + /* Else cpu is not in idle, do nothing here */ + rq_unlock_irqrestore(rq, &flags); + } + +out: + rcu_read_unlock(); +} + +static int valid_task_cpu(struct task_struct *p) +{ + cpumask_t valid_mask; + + if (p->flags & PF_KTHREAD) + cpumask_and(&valid_mask, &p->cpus_allowed, cpu_online_mask); + else + cpumask_and(&valid_mask, &p->cpus_allowed, cpu_active_mask); + + if (unlikely(!cpumask_weight(&valid_mask))) { + /* Hotplug boot threads do this before the CPU is up */ + printk(KERN_INFO "SCHED: No cpumask for %s/%d weight %d\n", p->comm, p->pid, cpumask_weight(&p->cpus_allowed)); + return cpumask_any(&p->cpus_allowed); + } + return cpumask_any(&valid_mask); +} + +/* + * For a task that's just being woken up we have a valuable balancing + * opportunity so choose the nearest cache most lightly loaded runqueue. + * Entered with rq locked and returns with the chosen runqueue locked. + */ +static inline int select_best_cpu(struct task_struct *p) +{ + unsigned int idlest = ~0U; + struct rq *rq = NULL; + int i; + + if (suitable_idle_cpus(p)) { + int cpu = task_cpu(p); + + if (unlikely(needs_other_cpu(p, cpu))) + cpu = valid_task_cpu(p); + rq = resched_best_idle(p, cpu); + if (likely(rq)) + return rq->cpu; + } + + for (i = 0; i < num_possible_cpus(); i++) { + struct rq *other_rq = task_rq(p)->rq_order[i]; + int entries; + + if (!other_rq->online) + continue; + if (needs_other_cpu(p, other_rq->cpu)) + continue; + entries = rq_load(other_rq); + if (entries >= idlest) + continue; + idlest = entries; + rq = other_rq; + } + if (unlikely(!rq)) + return task_cpu(p); + return rq->cpu; +} +#else /* CONFIG_SMP */ +static int valid_task_cpu(struct task_struct *p) +{ + return 0; +} + +static inline int select_best_cpu(struct task_struct *p) +{ + return 0; +} + +static struct rq *resched_best_idle(struct task_struct *p, int cpu) +{ + return NULL; +} +#endif /* CONFIG_SMP */ + +static void ttwu_queue(struct task_struct *p, int cpu, int wake_flags) +{ + struct rq *rq = cpu_rq(cpu); + +#if defined(CONFIG_SMP) + if (!cpus_share_cache(smp_processor_id(), cpu)) { + sched_clock_cpu(cpu); /* Sync clocks across CPUs */ + ttwu_queue_remote(p, cpu, wake_flags); + return; + } +#endif + rq_lock(rq); + ttwu_do_activate(rq, p, wake_flags); + rq_unlock(rq); +} + +/*** + * try_to_wake_up - wake up a thread + * @p: the thread to be awakened + * @state: the mask of task states that can be woken + * @wake_flags: wake modifier flags (WF_*) + * + * Put it on the run-queue if it's not already there. The "current" + * thread is always on the run-queue (except when the actual + * re-schedule is in progress), and as such you're allowed to do + * the simpler "current->state = TASK_RUNNING" to mark yourself + * runnable without the overhead of this. + * + * Return: %true if @p was woken up, %false if it was already running. + * or @state didn't match @p's state. + */ +static int +try_to_wake_up(struct task_struct *p, unsigned int state, int wake_flags) +{ + unsigned long flags; + int cpu, success = 0; + + /* + * If we are going to wake up a thread waiting for CONDITION we + * need to ensure that CONDITION=1 done by the caller can not be + * reordered with p->state check below. This pairs with mb() in + * set_current_state() the waiting thread does. + */ + smp_mb__before_spinlock(); + raw_spin_lock_irqsave(&p->pi_lock, flags); + /* state is a volatile long, どうして、分からない */ + if (!((unsigned int)p->state & state)) + goto out; + + trace_sched_waking(p); + + /* We're going to change ->state: */ + success = 1; + cpu = task_cpu(p); + + /* + * Ensure we load p->on_rq _after_ p->state, otherwise it would + * be possible to, falsely, observe p->on_rq == 0 and get stuck + * in smp_cond_load_acquire() below. + * + * sched_ttwu_pending() try_to_wake_up() + * [S] p->on_rq = 1; [L] P->state + * UNLOCK rq->lock -----. + * \ + * +--- RMB + * schedule() / + * LOCK rq->lock -----' + * UNLOCK rq->lock + * + * [task p] + * [S] p->state = UNINTERRUPTIBLE [L] p->on_rq + * + * Pairs with the UNLOCK+LOCK on rq->lock from the + * last wakeup of our task and the schedule that got our task + * current. + */ + smp_rmb(); + if (p->on_rq && ttwu_remote(p, wake_flags)) + goto stat; + +#ifdef CONFIG_SMP + /* + * Ensure we load p->on_cpu _after_ p->on_rq, otherwise it would be + * possible to, falsely, observe p->on_cpu == 0. + * + * One must be running (->on_cpu == 1) in order to remove oneself + * from the runqueue. + * + * [S] ->on_cpu = 1; [L] ->on_rq + * UNLOCK rq->lock + * RMB + * LOCK rq->lock + * [S] ->on_rq = 0; [L] ->on_cpu + * + * Pairs with the full barrier implied in the UNLOCK+LOCK on rq->lock + * from the consecutive calls to schedule(); the first switching to our + * task, the second putting it to sleep. + */ + smp_rmb(); + + /* + * If the owning (remote) CPU is still in the middle of schedule() with + * this task as prev, wait until its done referencing the task. + * + * Pairs with the smp_store_release() in finish_lock_switch(). + * + * This ensures that tasks getting woken will be fully ordered against + * their previous state and preserve Program Order. + */ + smp_cond_load_acquire(&p->on_cpu, !VAL); + + p->sched_contributes_to_load = !!task_contributes_to_load(p); + p->state = TASK_WAKING; + + if (p->in_iowait) { + delayacct_blkio_end(); + atomic_dec(&task_rq(p)->nr_iowait); + } + + cpu = select_best_cpu(p); + if (task_cpu(p) != cpu) + set_task_cpu(p, cpu); + +#else /* CONFIG_SMP */ + + if (p->in_iowait) { + delayacct_blkio_end(); + atomic_dec(&task_rq(p)->nr_iowait); + } + +#endif /* CONFIG_SMP */ + + ttwu_queue(p, cpu, wake_flags); +stat: + ttwu_stat(p, cpu, wake_flags); +out: + raw_spin_unlock_irqrestore(&p->pi_lock, flags); + + return success; +} + +/** + * try_to_wake_up_local - try to wake up a local task with rq lock held + * @p: the thread to be awakened + * + * Put @p on the run-queue if it's not already there. The caller must + * ensure that rq is locked and, @p is not the current task. + * rq stays locked over invocation. + */ +static void try_to_wake_up_local(struct task_struct *p) +{ + struct rq *rq = task_rq(p); + + if (WARN_ON_ONCE(rq != this_rq()) || + WARN_ON_ONCE(p == current)) + return; + + lockdep_assert_held(&rq->lock); + + if (!raw_spin_trylock(&p->pi_lock)) { + /* + * This is OK, because current is on_cpu, which avoids it being + * picked for load-balance and preemption/IRQs are still + * disabled avoiding further scheduler activity on it and we've + * not yet picked a replacement task. + */ + rq_unlock(rq); + raw_spin_lock(&p->pi_lock); + rq_lock(rq); + } + + if (!(p->state & TASK_NORMAL)) + goto out; + + trace_sched_waking(p); + + if (!task_on_rq_queued(p)) { + if (p->in_iowait) { + delayacct_blkio_end(); + atomic_dec(&rq->nr_iowait); + } + ttwu_activate(rq, p); + } + + ttwu_do_wakeup(rq, p, 0); + ttwu_stat(p, smp_processor_id(), 0); +out: + raw_spin_unlock(&p->pi_lock); +} + +/** + * wake_up_process - Wake up a specific process + * @p: The process to be woken up. + * + * Attempt to wake up the nominated process and move it to the set of runnable + * processes. + * + * Return: 1 if the process was woken up, 0 if it was already running. + * + * It may be assumed that this function implies a write memory barrier before + * changing the task state if and only if any tasks are woken up. + */ +int wake_up_process(struct task_struct *p) +{ + return try_to_wake_up(p, TASK_NORMAL, 0); +} +EXPORT_SYMBOL(wake_up_process); + +int wake_up_state(struct task_struct *p, unsigned int state) +{ + return try_to_wake_up(p, state, 0); +} + +static void time_slice_expired(struct task_struct *p, struct rq *rq); + +/* + * Perform scheduler related setup for a newly forked process p. + * p is forked by current. + */ +int sched_fork(unsigned long __maybe_unused clone_flags, struct task_struct *p) +{ + unsigned long flags; + int cpu = get_cpu(); + +#ifdef CONFIG_PREEMPT_NOTIFIERS + INIT_HLIST_HEAD(&p->preempt_notifiers); +#endif + /* + * We mark the process as NEW here. This guarantees that + * nobody will actually run it, and a signal or other external + * event cannot wake it up and insert it on the runqueue either. + */ + p->state = TASK_NEW; + + /* + * The process state is set to the same value of the process executing + * do_fork() code. That is running. This guarantees that nobody will + * actually run it, and a signal or other external event cannot wake + * it up and insert it on the runqueue either. + */ + + /* Should be reset in fork.c but done here for ease of MuQSS patching */ + p->on_cpu = + p->on_rq = + p->utime = + p->stime = + p->sched_time = + p->stime_ns = + p->utime_ns = 0; + skiplist_node_init(&p->node); + + /* + * Revert to default priority/policy on fork if requested. + */ + if (unlikely(p->sched_reset_on_fork)) { + if (p->policy == SCHED_FIFO || p->policy == SCHED_RR) { + p->policy = SCHED_NORMAL; + p->normal_prio = normal_prio(p); + } + + if (PRIO_TO_NICE(p->static_prio) < 0) { + p->static_prio = NICE_TO_PRIO(0); + p->normal_prio = p->static_prio; + } + + /* + * We don't need the reset flag anymore after the fork. It has + * fulfilled its duty: + */ + p->sched_reset_on_fork = 0; + } + + /* + * Silence PROVE_RCU. + */ + raw_spin_lock_irqsave(&p->pi_lock, flags); + set_task_cpu(p, cpu); + raw_spin_unlock_irqrestore(&p->pi_lock, flags); + +#ifdef CONFIG_SCHED_INFO + if (unlikely(sched_info_on())) + memset(&p->sched_info, 0, sizeof(p->sched_info)); +#endif + init_task_preempt_count(p); + + put_cpu(); + return 0; +} + +#ifdef CONFIG_SCHEDSTATS + +DEFINE_STATIC_KEY_FALSE(sched_schedstats); +static bool __initdata __sched_schedstats = false; + +static void set_schedstats(bool enabled) +{ + if (enabled) + static_branch_enable(&sched_schedstats); + else + static_branch_disable(&sched_schedstats); +} + +void force_schedstat_enabled(void) +{ + if (!schedstat_enabled()) { + pr_info("kernel profiling enabled schedstats, disable via kernel.sched_schedstats.\n"); + static_branch_enable(&sched_schedstats); + } +} + +static int __init setup_schedstats(char *str) +{ + int ret = 0; + if (!str) + goto out; + + /* + * This code is called before jump labels have been set up, so we can't + * change the static branch directly just yet. Instead set a temporary + * variable so init_schedstats() can do it later. + */ + if (!strcmp(str, "enable")) { + __sched_schedstats = true; + ret = 1; + } else if (!strcmp(str, "disable")) { + __sched_schedstats = false; + ret = 1; + } +out: + if (!ret) + pr_warn("Unable to parse schedstats=\n"); + + return ret; +} +__setup("schedstats=", setup_schedstats); + +static void __init init_schedstats(void) +{ + set_schedstats(__sched_schedstats); +} + +#ifdef CONFIG_PROC_SYSCTL +int sysctl_schedstats(struct ctl_table *table, int write, + void __user *buffer, size_t *lenp, loff_t *ppos) +{ + struct ctl_table t; + int err; + int state = static_branch_likely(&sched_schedstats); + + if (write && !capable(CAP_SYS_ADMIN)) + return -EPERM; + + t = *table; + t.data = &state; + err = proc_dointvec_minmax(&t, write, buffer, lenp, ppos); + if (err < 0) + return err; + if (write) + set_schedstats(state); + return err; +} +#endif /* CONFIG_PROC_SYSCTL */ +#else /* !CONFIG_SCHEDSTATS */ +static inline void init_schedstats(void) {} +#endif /* CONFIG_SCHEDSTATS */ + +static void update_cpu_clock_switch(struct rq *rq, struct task_struct *p); + +static void account_task_cpu(struct rq *rq, struct task_struct *p) +{ + update_clocks(rq); + /* This isn't really a context switch but accounting is the same */ + update_cpu_clock_switch(rq, p); + p->last_ran = rq->niffies; +} + +bool sched_smp_initialized __read_mostly; + +static inline int hrexpiry_enabled(struct rq *rq) +{ + if (unlikely(!cpu_active(cpu_of(rq)) || !sched_smp_initialized)) + return 0; + return hrtimer_is_hres_active(&rq->hrexpiry_timer); +} + +/* + * Use HR-timers to deliver accurate preemption points. + */ +static inline void hrexpiry_clear(struct rq *rq) +{ + if (!hrexpiry_enabled(rq)) + return; + if (hrtimer_active(&rq->hrexpiry_timer)) + hrtimer_cancel(&rq->hrexpiry_timer); +} + +/* + * High-resolution time_slice expiry. + * Runs from hardirq context with interrupts disabled. + */ +static enum hrtimer_restart hrexpiry(struct hrtimer *timer) +{ + struct rq *rq = container_of(timer, struct rq, hrexpiry_timer); + struct task_struct *p; + + /* This can happen during CPU hotplug / resume */ + if (unlikely(cpu_of(rq) != smp_processor_id())) + goto out; + + /* + * We're doing this without the runqueue lock but this should always + * be run on the local CPU. Time slice should run out in __schedule + * but we set it to zero here in case niffies is slightly less. + */ + p = rq->curr; + p->time_slice = 0; + __set_tsk_resched(p); +out: + return HRTIMER_NORESTART; +} + +/* + * Called to set the hrexpiry timer state. + * + * called with irqs disabled from the local CPU only + */ +static void hrexpiry_start(struct rq *rq, u64 delay) +{ + if (!hrexpiry_enabled(rq)) + return; + + hrtimer_start(&rq->hrexpiry_timer, ns_to_ktime(delay), + HRTIMER_MODE_REL_PINNED); +} + +static void init_rq_hrexpiry(struct rq *rq) +{ + hrtimer_init(&rq->hrexpiry_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + rq->hrexpiry_timer.function = hrexpiry; +} + +static inline int rq_dither(struct rq *rq) +{ + if (!hrexpiry_enabled(rq)) + return HALF_JIFFY_US; + return 0; +} + +/* + * wake_up_new_task - wake up a newly created task for the first time. + * + * This function will do some initial scheduler statistics housekeeping + * that must be done for every newly created context, then puts the task + * on the runqueue and wakes it. + */ +void wake_up_new_task(struct task_struct *p) +{ + struct task_struct *parent, *rq_curr; + struct rq *rq, *new_rq; + unsigned long flags; + + parent = p->parent; + + raw_spin_lock_irqsave(&p->pi_lock, flags); + p->state = TASK_RUNNING; + /* Task_rq can't change yet on a new task */ + new_rq = rq = task_rq(p); + if (unlikely(needs_other_cpu(p, task_cpu(p)))) { + set_task_cpu(p, valid_task_cpu(p)); + new_rq = task_rq(p); + } + + double_rq_lock(rq, new_rq); + rq_curr = rq->curr; + + /* + * Make sure we do not leak PI boosting priority to the child. + */ + p->prio = rq_curr->normal_prio; + + trace_sched_wakeup_new(p); + + /* + * Share the timeslice between parent and child, thus the + * total amount of pending timeslices in the system doesn't change, + * resulting in more scheduling fairness. If it's negative, it won't + * matter since that's the same as being 0. rq->rq_deadline is only + * modified within schedule() so it is always equal to + * current->deadline. + */ + account_task_cpu(rq, rq_curr); + p->last_ran = rq_curr->last_ran; + if (likely(rq_curr->policy != SCHED_FIFO)) { + rq_curr->time_slice /= 2; + if (rq_curr->time_slice < RESCHED_US) { + /* + * Forking task has run out of timeslice. Reschedule it and + * start its child with a new time slice and deadline. The + * child will end up running first because its deadline will + * be slightly earlier. + */ + __set_tsk_resched(rq_curr); + time_slice_expired(p, new_rq); + if (suitable_idle_cpus(p)) + resched_best_idle(p, task_cpu(p)); + else if (unlikely(rq != new_rq)) + try_preempt(p, new_rq); + } else { + p->time_slice = rq_curr->time_slice; + if (rq_curr == parent && rq == new_rq && !suitable_idle_cpus(p)) { + /* + * The VM isn't cloned, so we're in a good position to + * do child-runs-first in anticipation of an exec. This + * usually avoids a lot of COW overhead. + */ + __set_tsk_resched(rq_curr); + } else { + /* + * Adjust the hrexpiry since rq_curr will keep + * running and its timeslice has been shortened. + */ + hrexpiry_start(rq, US_TO_NS(rq_curr->time_slice)); + try_preempt(p, new_rq); + } + } + } else { + time_slice_expired(p, new_rq); + try_preempt(p, new_rq); + } + activate_task(p, new_rq); + double_rq_unlock(rq, new_rq); + raw_spin_unlock_irqrestore(&p->pi_lock, flags); +} + +#ifdef CONFIG_PREEMPT_NOTIFIERS + +static struct static_key preempt_notifier_key = STATIC_KEY_INIT_FALSE; + +void preempt_notifier_inc(void) +{ + static_key_slow_inc(&preempt_notifier_key); +} +EXPORT_SYMBOL_GPL(preempt_notifier_inc); + +void preempt_notifier_dec(void) +{ + static_key_slow_dec(&preempt_notifier_key); +} +EXPORT_SYMBOL_GPL(preempt_notifier_dec); + +/** + * preempt_notifier_register - tell me when current is being preempted & rescheduled + * @notifier: notifier struct to register + */ +void preempt_notifier_register(struct preempt_notifier *notifier) +{ + if (!static_key_false(&preempt_notifier_key)) + WARN(1, "registering preempt_notifier while notifiers disabled\n"); + + hlist_add_head(¬ifier->link, ¤t->preempt_notifiers); +} +EXPORT_SYMBOL_GPL(preempt_notifier_register); + +/** + * preempt_notifier_unregister - no longer interested in preemption notifications + * @notifier: notifier struct to unregister + * + * This is *not* safe to call from within a preemption notifier. + */ +void preempt_notifier_unregister(struct preempt_notifier *notifier) +{ + hlist_del(¬ifier->link); +} +EXPORT_SYMBOL_GPL(preempt_notifier_unregister); + +static void __fire_sched_in_preempt_notifiers(struct task_struct *curr) +{ + struct preempt_notifier *notifier; + + hlist_for_each_entry(notifier, &curr->preempt_notifiers, link) + notifier->ops->sched_in(notifier, raw_smp_processor_id()); +} + +static __always_inline void fire_sched_in_preempt_notifiers(struct task_struct *curr) +{ + if (static_key_false(&preempt_notifier_key)) + __fire_sched_in_preempt_notifiers(curr); +} + +static void +__fire_sched_out_preempt_notifiers(struct task_struct *curr, + struct task_struct *next) +{ + struct preempt_notifier *notifier; + + hlist_for_each_entry(notifier, &curr->preempt_notifiers, link) + notifier->ops->sched_out(notifier, next); +} + +static __always_inline void +fire_sched_out_preempt_notifiers(struct task_struct *curr, + struct task_struct *next) +{ + if (static_key_false(&preempt_notifier_key)) + __fire_sched_out_preempt_notifiers(curr, next); +} + +#else /* !CONFIG_PREEMPT_NOTIFIERS */ + +static inline void fire_sched_in_preempt_notifiers(struct task_struct *curr) +{ +} + +static inline void +fire_sched_out_preempt_notifiers(struct task_struct *curr, + struct task_struct *next) +{ +} + +#endif /* CONFIG_PREEMPT_NOTIFIERS */ + +/** + * prepare_task_switch - prepare to switch tasks + * @rq: the runqueue preparing to switch + * @next: the task we are going to switch to. + * + * This is called with the rq lock held and interrupts off. It must + * be paired with a subsequent finish_task_switch after the context + * switch. + * + * prepare_task_switch sets up locking and calls architecture specific + * hooks. + */ +static inline void +prepare_task_switch(struct rq *rq, struct task_struct *prev, + struct task_struct *next) +{ + sched_info_switch(rq, prev, next); + perf_event_task_sched_out(prev, next); + fire_sched_out_preempt_notifiers(prev, next); + prepare_lock_switch(rq, next); + prepare_arch_switch(next); +} + +/** + * finish_task_switch - clean up after a task-switch + * @rq: runqueue associated with task-switch + * @prev: the thread we just switched away from. + * + * finish_task_switch must be called after the context switch, paired + * with a prepare_task_switch call before the context switch. + * finish_task_switch will reconcile locking set up by prepare_task_switch, + * and do any other architecture-specific cleanup actions. + * + * Note that we may have delayed dropping an mm in context_switch(). If + * so, we finish that here outside of the runqueue lock. (Doing it + * with the lock held can cause deadlocks; see schedule() for + * details.) + * + * The context switch have flipped the stack from under us and restored the + * local variables which were saved when this task called schedule() in the + * past. prev == current is still correct but we need to recalculate this_rq + * because prev may have moved to another CPU. + */ +static void finish_task_switch(struct task_struct *prev) + __releases(rq->lock) +{ + struct rq *rq = this_rq(); + struct mm_struct *mm = rq->prev_mm; + long prev_state; + + /* + * The previous task will have left us with a preempt_count of 2 + * because it left us after: + * + * schedule() + * preempt_disable(); // 1 + * __schedule() + * raw_spin_lock_irq(&rq->lock) // 2 + * + * Also, see FORK_PREEMPT_COUNT. + */ + if (WARN_ONCE(preempt_count() != 2*PREEMPT_DISABLE_OFFSET, + "corrupted preempt_count: %s/%d/0x%x\n", + current->comm, current->pid, preempt_count())) + preempt_count_set(FORK_PREEMPT_COUNT); + + rq->prev_mm = NULL; + + /* + * A task struct has one reference for the use as "current". + * If a task dies, then it sets TASK_DEAD in tsk->state and calls + * schedule one last time. The schedule call will never return, and + * the scheduled task must drop that reference. + * + * We must observe prev->state before clearing prev->on_cpu (in + * finish_lock_switch), otherwise a concurrent wakeup can get prev + * running on another CPU and we could rave with its RUNNING -> DEAD + * transition, resulting in a double drop. + */ + prev_state = prev->state; + vtime_task_switch(prev); + perf_event_task_sched_in(prev, current); + finish_lock_switch(rq, prev); + finish_arch_post_lock_switch(); + + fire_sched_in_preempt_notifiers(current); + if (mm) + mmdrop(mm); + if (unlikely(prev_state == TASK_DEAD)) { + /* + * Remove function-return probe instances associated with this + * task and put them back on the free list. + */ + kprobe_flush_task(prev); + + /* Task is done with its stack. */ + put_task_stack(prev); + + put_task_struct(prev); + } +} + +/** + * schedule_tail - first thing a freshly forked thread must call. + * @prev: the thread we just switched away from. + */ +asmlinkage __visible void schedule_tail(struct task_struct *prev) +{ + /* + * New tasks start with FORK_PREEMPT_COUNT, see there and + * finish_task_switch() for details. + * + * finish_task_switch() will drop rq->lock() and lower preempt_count + * and the preempt_enable() will end up enabling preemption (on + * PREEMPT_COUNT kernels). + */ + + finish_task_switch(prev); + preempt_enable(); + + if (current->set_child_tid) + put_user(task_pid_vnr(current), current->set_child_tid); +} + +/* + * context_switch - switch to the new MM and the new thread's register state. + */ +static __always_inline void +context_switch(struct rq *rq, struct task_struct *prev, + struct task_struct *next) +{ + struct mm_struct *mm, *oldmm; + + prepare_task_switch(rq, prev, next); + + mm = next->mm; + oldmm = prev->active_mm; + /* + * For paravirt, this is coupled with an exit in switch_to to + * combine the page table reload and the switch backend into + * one hypercall. + */ + arch_start_context_switch(prev); + + if (!mm) { + next->active_mm = oldmm; + mmgrab(oldmm); + enter_lazy_tlb(oldmm, next); + } else + switch_mm_irqs_off(oldmm, mm, next); + + if (!prev->mm) { + prev->active_mm = NULL; + rq->prev_mm = oldmm; + } + /* + * Since the runqueue lock will be released by the next + * task (which is an invalid locking op but in the case + * of the scheduler it's an obvious special-case), so we + * do an early lockdep release here: + */ + spin_release(&rq->lock.dep_map, 1, _THIS_IP_); + + /* Here we just switch the register state and the stack. */ + switch_to(prev, next, prev); + barrier(); + + finish_task_switch(prev); +} + +/* + * nr_running, nr_uninterruptible and nr_context_switches: + * + * externally visible scheduler statistics: current number of runnable + * threads, total number of context switches performed since bootup. + */ +unsigned long nr_running(void) +{ + unsigned long i, sum = 0; + + for_each_online_cpu(i) + sum += cpu_rq(i)->nr_running; + + return sum; +} + +static unsigned long nr_uninterruptible(void) +{ + unsigned long i, sum = 0; + + for_each_online_cpu(i) + sum += cpu_rq(i)->nr_uninterruptible; + + return sum; +} + +/* + * Check if only the current task is running on the CPU. + * + * Caution: this function does not check that the caller has disabled + * preemption, thus the result might have a time-of-check-to-time-of-use + * race. The caller is responsible to use it correctly, for example: + * + * - from a non-preemptable section (of course) + * + * - from a thread that is bound to a single CPU + * + * - in a loop with very short iterations (e.g. a polling loop) + */ +bool single_task_running(void) +{ + struct rq *rq = cpu_rq(smp_processor_id()); + + if (rq_load(rq) == 1) + return true; + else + return false; +} +EXPORT_SYMBOL(single_task_running); + +unsigned long long nr_context_switches(void) +{ + int i; + unsigned long long sum = 0; + + for_each_possible_cpu(i) + sum += cpu_rq(i)->nr_switches; + + return sum; +} + +/* + * IO-wait accounting, and how its mostly bollocks (on SMP). + * + * The idea behind IO-wait account is to account the idle time that we could + * have spend running if it were not for IO. That is, if we were to improve the + * storage performance, we'd have a proportional reduction in IO-wait time. + * + * This all works nicely on UP, where, when a task blocks on IO, we account + * idle time as IO-wait, because if the storage were faster, it could've been + * running and we'd not be idle. + * + * This has been extended to SMP, by doing the same for each CPU. This however + * is broken. + * + * Imagine for instance the case where two tasks block on one CPU, only the one + * CPU will have IO-wait accounted, while the other has regular idle. Even + * though, if the storage were faster, both could've ran at the same time, + * utilising both CPUs. + * + * This means, that when looking globally, the current IO-wait accounting on + * SMP is a lower bound, by reason of under accounting. + * + * Worse, since the numbers are provided per CPU, they are sometimes + * interpreted per CPU, and that is nonsensical. A blocked task isn't strictly + * associated with any one particular CPU, it can wake to another CPU than it + * blocked on. This means the per CPU IO-wait number is meaningless. + * + * Task CPU affinities can make all that even more 'interesting'. + */ + +unsigned long nr_iowait(void) +{ + unsigned long i, sum = 0; + + for_each_possible_cpu(i) + sum += atomic_read(&cpu_rq(i)->nr_iowait); + + return sum; +} + +/* + * Consumers of these two interfaces, like for example the cpufreq menu + * governor are using nonsensical data. Boosting frequency for a CPU that has + * IO-wait which might not even end up running the task when it does become + * runnable. + */ + +unsigned long nr_iowait_cpu(int cpu) +{ + struct rq *this = cpu_rq(cpu); + return atomic_read(&this->nr_iowait); +} + +unsigned long nr_active(void) +{ + return nr_running() + nr_uninterruptible(); +} + +/* + * I/O wait is the number of running or queued tasks with their ->rq pointer + * set to this cpu as being the CPU they're more likely to run on. + */ +void get_iowait_load(unsigned long *nr_waiters, unsigned long *load) +{ + struct rq *rq = this_rq(); + + *nr_waiters = atomic_read(&rq->nr_iowait); + *load = rq_load(rq); +} + +/* Variables and functions for calc_load */ +static unsigned long calc_load_update; +unsigned long avenrun[3]; +EXPORT_SYMBOL(avenrun); + +/** + * get_avenrun - get the load average array + * @loads: pointer to dest load array + * @offset: offset to add + * @shift: shift count to shift the result left + * + * These values are estimates at best, so no need for locking. + */ +void get_avenrun(unsigned long *loads, unsigned long offset, int shift) +{ + loads[0] = (avenrun[0] + offset) << shift; + loads[1] = (avenrun[1] + offset) << shift; + loads[2] = (avenrun[2] + offset) << shift; +} + +static unsigned long +calc_load(unsigned long load, unsigned long exp, unsigned long active) +{ + unsigned long newload; + + newload = load * exp + active * (FIXED_1 - exp); + if (active >= load) + newload += FIXED_1-1; + + return newload / FIXED_1; +} + +/* + * calc_load - update the avenrun load estimates every LOAD_FREQ seconds. + */ +void calc_global_load(unsigned long ticks) +{ + long active; + + if (time_before(jiffies, READ_ONCE(calc_load_update))) + return; + active = nr_active() * FIXED_1; + + avenrun[0] = calc_load(avenrun[0], EXP_1, active); + avenrun[1] = calc_load(avenrun[1], EXP_5, active); + avenrun[2] = calc_load(avenrun[2], EXP_15, active); + + calc_load_update = jiffies + LOAD_FREQ; +} + +DEFINE_PER_CPU(struct kernel_stat, kstat); +DEFINE_PER_CPU(struct kernel_cpustat, kernel_cpustat); + +EXPORT_PER_CPU_SYMBOL(kstat); +EXPORT_PER_CPU_SYMBOL(kernel_cpustat); + +#ifdef CONFIG_PARAVIRT +static inline u64 steal_ticks(u64 steal) +{ + if (unlikely(steal > NSEC_PER_SEC)) + return div_u64(steal, TICK_NSEC); + + return __iter_div_u64_rem(steal, TICK_NSEC, &steal); +} +#endif + +#ifndef nsecs_to_cputime +# define nsecs_to_cputime(__nsecs) nsecs_to_jiffies(__nsecs) +#endif + +/* + * On each tick, add the number of nanoseconds to the unbanked variables and + * once one tick's worth has accumulated, account it allowing for accurate + * sub-tick accounting and totals. + */ +static void pc_idle_time(struct rq *rq, struct task_struct *idle, unsigned long ns) +{ + u64 *cpustat = kcpustat_this_cpu->cpustat; + unsigned long ticks; + + if (atomic_read(&rq->nr_iowait) > 0) { + rq->iowait_ns += ns; + if (rq->iowait_ns >= JIFFY_NS) { + ticks = NS_TO_JIFFIES(rq->iowait_ns); + cpustat[CPUTIME_IOWAIT] += (__force u64)TICK_NSEC * ticks; + rq->iowait_ns %= JIFFY_NS; + } + } else { + rq->idle_ns += ns; + if (rq->idle_ns >= JIFFY_NS) { + ticks = NS_TO_JIFFIES(rq->idle_ns); + cpustat[CPUTIME_IDLE] += (__force u64)TICK_NSEC * ticks; + rq->idle_ns %= JIFFY_NS; + } + } + acct_update_integrals(idle); +} + +static void pc_system_time(struct rq *rq, struct task_struct *p, + int hardirq_offset, unsigned long ns) +{ + u64 *cpustat = kcpustat_this_cpu->cpustat; + unsigned long ticks; + + p->stime_ns += ns; + if (p->stime_ns >= JIFFY_NS) { + ticks = NS_TO_JIFFIES(p->stime_ns); + p->stime_ns %= JIFFY_NS; + p->stime += (__force u64)TICK_NSEC * ticks; + account_group_system_time(p, TICK_NSEC * ticks); + } + p->sched_time += ns; + account_group_exec_runtime(p, ns); + + if (hardirq_count() - hardirq_offset) { + rq->irq_ns += ns; + if (rq->irq_ns >= JIFFY_NS) { + ticks = NS_TO_JIFFIES(rq->irq_ns); + cpustat[CPUTIME_IRQ] += (__force u64)TICK_NSEC * ticks; + rq->irq_ns %= JIFFY_NS; + } + } else if (in_serving_softirq()) { + rq->softirq_ns += ns; + if (rq->softirq_ns >= JIFFY_NS) { + ticks = NS_TO_JIFFIES(rq->softirq_ns); + cpustat[CPUTIME_SOFTIRQ] += (__force u64)TICK_NSEC * ticks; + rq->softirq_ns %= JIFFY_NS; + } + } else { + rq->system_ns += ns; + if (rq->system_ns >= JIFFY_NS) { + ticks = NS_TO_JIFFIES(rq->system_ns); + cpustat[CPUTIME_SYSTEM] += (__force u64)TICK_NSEC * ticks; + rq->system_ns %= JIFFY_NS; + } + } + acct_update_integrals(p); +} + +static void pc_user_time(struct rq *rq, struct task_struct *p, unsigned long ns) +{ + u64 *cpustat = kcpustat_this_cpu->cpustat; + unsigned long ticks; + + p->utime_ns += ns; + if (p->utime_ns >= JIFFY_NS) { + ticks = NS_TO_JIFFIES(p->utime_ns); + p->utime_ns %= JIFFY_NS; + p->utime += (__force u64)TICK_NSEC * ticks; + account_group_user_time(p, TICK_NSEC * ticks); + } + p->sched_time += ns; + account_group_exec_runtime(p, ns); + + if (this_cpu_ksoftirqd() == p) { + /* + * ksoftirqd time do not get accounted in cpu_softirq_time. + * So, we have to handle it separately here. + */ + rq->softirq_ns += ns; + if (rq->softirq_ns >= JIFFY_NS) { + ticks = NS_TO_JIFFIES(rq->softirq_ns); + cpustat[CPUTIME_SOFTIRQ] += (__force u64)TICK_NSEC * ticks; + rq->softirq_ns %= JIFFY_NS; + } + } + + if (task_nice(p) > 0 || idleprio_task(p)) { + rq->nice_ns += ns; + if (rq->nice_ns >= JIFFY_NS) { + ticks = NS_TO_JIFFIES(rq->nice_ns); + cpustat[CPUTIME_NICE] += (__force u64)TICK_NSEC * ticks; + rq->nice_ns %= JIFFY_NS; + } + } else { + rq->user_ns += ns; + if (rq->user_ns >= JIFFY_NS) { + ticks = NS_TO_JIFFIES(rq->user_ns); + cpustat[CPUTIME_USER] += (__force u64)TICK_NSEC * ticks; + rq->user_ns %= JIFFY_NS; + } + } + acct_update_integrals(p); +} + +/* + * This is called on clock ticks. + * Bank in p->sched_time the ns elapsed since the last tick or switch. + * CPU scheduler quota accounting is also performed here in microseconds. + */ +static void update_cpu_clock_tick(struct rq *rq, struct task_struct *p) +{ + s64 account_ns = rq->niffies - p->last_ran; + struct task_struct *idle = rq->idle; + + /* Accurate tick timekeeping */ + if (user_mode(get_irq_regs())) + pc_user_time(rq, p, account_ns); + else if (p != idle || (irq_count() != HARDIRQ_OFFSET)) { + pc_system_time(rq, p, HARDIRQ_OFFSET, account_ns); + } else + pc_idle_time(rq, idle, account_ns); + + /* time_slice accounting is done in usecs to avoid overflow on 32bit */ + if (p->policy != SCHED_FIFO && p != idle) + p->time_slice -= NS_TO_US(account_ns); + + p->last_ran = rq->niffies; +} + +/* + * This is called on context switches. + * Bank in p->sched_time the ns elapsed since the last tick or switch. + * CPU scheduler quota accounting is also performed here in microseconds. + */ +static void update_cpu_clock_switch(struct rq *rq, struct task_struct *p) +{ + s64 account_ns = rq->niffies - p->last_ran; + struct task_struct *idle = rq->idle; + + /* Accurate subtick timekeeping */ + if (p != idle) + pc_user_time(rq, p, account_ns); + else + pc_idle_time(rq, idle, account_ns); + + /* time_slice accounting is done in usecs to avoid overflow on 32bit */ + if (p->policy != SCHED_FIFO && p != idle) + p->time_slice -= NS_TO_US(account_ns); +} + +/* + * Return any ns on the sched_clock that have not yet been accounted in + * @p in case that task is currently running. + * + * Called with task_rq_lock(p) held. + */ +static inline u64 do_task_delta_exec(struct task_struct *p, struct rq *rq) +{ + u64 ns = 0; + + /* + * Must be ->curr _and_ ->on_rq. If dequeued, we would + * project cycles that may never be accounted to this + * thread, breaking clock_gettime(). + */ + if (p == rq->curr && task_on_rq_queued(p)) { + update_clocks(rq); + ns = rq->niffies - p->last_ran; + } + + return ns; +} + +/* + * Return accounted runtime for the task. + * Return separately the current's pending runtime that have not been + * accounted yet. + * + */ +unsigned long long task_sched_runtime(struct task_struct *p) +{ + unsigned long flags; + struct rq *rq; + u64 ns; + +#if defined(CONFIG_64BIT) && defined(CONFIG_SMP) + /* + * 64-bit doesn't need locks to atomically read a 64bit value. + * So we have a optimization chance when the task's delta_exec is 0. + * Reading ->on_cpu is racy, but this is ok. + * + * If we race with it leaving CPU, we'll take a lock. So we're correct. + * If we race with it entering CPU, unaccounted time is 0. This is + * indistinguishable from the read occurring a few cycles earlier. + * If we see ->on_cpu without ->on_rq, the task is leaving, and has + * been accounted, so we're correct here as well. + */ + if (!p->on_cpu || !task_on_rq_queued(p)) + return tsk_seruntime(p); +#endif + + rq = task_rq_lock(p, &flags); + ns = p->sched_time + do_task_delta_exec(p, rq); + task_rq_unlock(rq, p, &flags); + + return ns; +} + +/* + * Functions to test for when SCHED_ISO tasks have used their allocated + * quota as real time scheduling and convert them back to SCHED_NORMAL. All + * data is modified only by the local runqueue during scheduler_tick with + * interrupts disabled. + */ + +/* + * Test if SCHED_ISO tasks have run longer than their alloted period as RT + * tasks and set the refractory flag if necessary. There is 10% hysteresis + * for unsetting the flag. 115/128 is ~90/100 as a fast shift instead of a + * slow division. + */ +static inline void iso_tick(struct rq *rq) +{ + rq->iso_ticks = rq->iso_ticks * (ISO_PERIOD - 1) / ISO_PERIOD; + rq->iso_ticks += 100; + if (rq->iso_ticks > ISO_PERIOD * sched_iso_cpu) { + rq->iso_refractory = true; + if (unlikely(rq->iso_ticks > ISO_PERIOD * 100)) + rq->iso_ticks = ISO_PERIOD * 100; + } +} + +/* No SCHED_ISO task was running so decrease rq->iso_ticks */ +static inline void no_iso_tick(struct rq *rq, int ticks) +{ + if (rq->iso_ticks > 0 || rq->iso_refractory) { + rq->iso_ticks = rq->iso_ticks * (ISO_PERIOD - ticks) / ISO_PERIOD; + if (rq->iso_ticks < ISO_PERIOD * (sched_iso_cpu * 115 / 128)) { + rq->iso_refractory = false; + if (unlikely(rq->iso_ticks < 0)) + rq->iso_ticks = 0; + } + } +} + +/* This manages tasks that have run out of timeslice during a scheduler_tick */ +static void task_running_tick(struct rq *rq) +{ + struct task_struct *p = rq->curr; + + /* + * If a SCHED_ISO task is running we increment the iso_ticks. In + * order to prevent SCHED_ISO tasks from causing starvation in the + * presence of true RT tasks we account those as iso_ticks as well. + */ + if (rt_task(p) || task_running_iso(p)) + iso_tick(rq); + else + no_iso_tick(rq, 1); + + /* SCHED_FIFO tasks never run out of timeslice. */ + if (p->policy == SCHED_FIFO) + return; + + if (iso_task(p)) { + if (task_running_iso(p)) { + if (rq->iso_refractory) { + /* + * SCHED_ISO task is running as RT and limit + * has been hit. Force it to reschedule as + * SCHED_NORMAL by zeroing its time_slice + */ + p->time_slice = 0; + } + } else if (!rq->iso_refractory) { + /* Can now run again ISO. Reschedule to pick up prio */ + goto out_resched; + } + } + + /* + * Tasks that were scheduled in the first half of a tick are not + * allowed to run into the 2nd half of the next tick if they will + * run out of time slice in the interim. Otherwise, if they have + * less than RESCHED_US μs of time slice left they will be rescheduled. + * Dither is used as a backup for when hrexpiry is disabled or high res + * timers not configured in. + */ + if (p->time_slice - rq->dither >= RESCHED_US) + return; +out_resched: + rq_lock(rq); + __set_tsk_resched(p); + rq_unlock(rq); +} + +#ifdef CONFIG_NO_HZ_FULL +/* + * We can stop the timer tick any time highres timers are active since + * we rely entirely on highres timeouts for task expiry rescheduling. + */ +static void sched_stop_tick(struct rq *rq, int cpu) +{ + if (!hrexpiry_enabled(rq)) + return; + if (!tick_nohz_full_enabled()) + return; + if (!tick_nohz_full_cpu(cpu)) + return; + tick_nohz_dep_clear_cpu(cpu, TICK_DEP_BIT_SCHED); +} + +static inline void sched_start_tick(struct rq *rq, int cpu) +{ + tick_nohz_dep_set_cpu(cpu, TICK_DEP_BIT_SCHED); +} + +/** + * scheduler_tick_max_deferment + * + * Keep at least one tick per second when a single + * active task is running. + * + * This makes sure that uptime continues to move forward, even + * with a very low granularity. + * + * Return: Maximum deferment in nanoseconds. + */ +u64 scheduler_tick_max_deferment(void) +{ + struct rq *rq = this_rq(); + unsigned long next, now = READ_ONCE(jiffies); + + next = rq->last_jiffy + HZ; + + if (time_before_eq(next, now)) + return 0; + + return jiffies_to_nsecs(next - now); +} +#else +static inline void sched_stop_tick(struct rq *rq, int cpu) +{ +} + +static inline void sched_start_tick(struct rq *rq, int cpu) +{ +} +#endif + +/* + * This function gets called by the timer code, with HZ frequency. + * We call it with interrupts disabled. + */ +void scheduler_tick(void) +{ + int cpu __maybe_unused = smp_processor_id(); + struct rq *rq = cpu_rq(cpu); + + sched_clock_tick(); + update_clocks(rq); + update_load_avg(rq, 0); + update_cpu_clock_tick(rq, rq->curr); + if (!rq_idle(rq)) + task_running_tick(rq); + else if (rq->last_jiffy > rq->last_scheduler_tick) + no_iso_tick(rq, rq->last_jiffy - rq->last_scheduler_tick); + rq->last_scheduler_tick = rq->last_jiffy; + rq->last_tick = rq->clock; + perf_event_task_tick(); + sched_stop_tick(rq, cpu); +} + +#if defined(CONFIG_PREEMPT) && (defined(CONFIG_DEBUG_PREEMPT) || \ + defined(CONFIG_PREEMPT_TRACER)) +/* + * If the value passed in is equal to the current preempt count + * then we just disabled preemption. Start timing the latency. + */ +static inline void preempt_latency_start(int val) +{ + if (preempt_count() == val) { + unsigned long ip = get_lock_parent_ip(); +#ifdef CONFIG_DEBUG_PREEMPT + current->preempt_disable_ip = ip; +#endif + trace_preempt_off(CALLER_ADDR0, ip); + } +} + +void preempt_count_add(int val) +{ +#ifdef CONFIG_DEBUG_PREEMPT + /* + * Underflow? + */ + if (DEBUG_LOCKS_WARN_ON((preempt_count() < 0))) + return; +#endif + __preempt_count_add(val); +#ifdef CONFIG_DEBUG_PREEMPT + /* + * Spinlock count overflowing soon? + */ + DEBUG_LOCKS_WARN_ON((preempt_count() & PREEMPT_MASK) >= + PREEMPT_MASK - 10); +#endif + preempt_latency_start(val); +} +EXPORT_SYMBOL(preempt_count_add); +NOKPROBE_SYMBOL(preempt_count_add); + +/* + * If the value passed in equals to the current preempt count + * then we just enabled preemption. Stop timing the latency. + */ +static inline void preempt_latency_stop(int val) +{ + if (preempt_count() == val) + trace_preempt_on(CALLER_ADDR0, get_lock_parent_ip()); +} + +void preempt_count_sub(int val) +{ +#ifdef CONFIG_DEBUG_PREEMPT + /* + * Underflow? + */ + if (DEBUG_LOCKS_WARN_ON(val > preempt_count())) + return; + /* + * Is the spinlock portion underflowing? + */ + if (DEBUG_LOCKS_WARN_ON((val < PREEMPT_MASK) && + !(preempt_count() & PREEMPT_MASK))) + return; +#endif + + preempt_latency_stop(val); + __preempt_count_sub(val); +} +EXPORT_SYMBOL(preempt_count_sub); +NOKPROBE_SYMBOL(preempt_count_sub); + +#else +static inline void preempt_latency_start(int val) { } +static inline void preempt_latency_stop(int val) { } +#endif + +static inline unsigned long get_preempt_disable_ip(struct task_struct *p) +{ +#ifdef CONFIG_DEBUG_PREEMPT + return p->preempt_disable_ip; +#else + return 0; +#endif +} + +/* + * The time_slice is only refilled when it is empty and that is when we set a + * new deadline. Make sure update_clocks has been called recently to update + * rq->niffies. + */ +static void time_slice_expired(struct task_struct *p, struct rq *rq) +{ + p->time_slice = timeslice(); + p->deadline = rq->niffies + task_deadline_diff(p); +#ifdef CONFIG_SMT_NICE + if (!p->mm) + p->smt_bias = 0; + else if (rt_task(p)) + p->smt_bias = 1 << 30; + else if (task_running_iso(p)) + p->smt_bias = 1 << 29; + else if (idleprio_task(p)) { + if (task_running_idle(p)) + p->smt_bias = 0; + else + p->smt_bias = 1; + } else if (--p->smt_bias < 1) + p->smt_bias = MAX_PRIO - p->static_prio; +#endif +} + +/* + * Timeslices below RESCHED_US are considered as good as expired as there's no + * point rescheduling when there's so little time left. SCHED_BATCH tasks + * have been flagged be not latency sensitive and likely to be fully CPU + * bound so every time they're rescheduled they have their time_slice + * refilled, but get a new later deadline to have little effect on + * SCHED_NORMAL tasks. + + */ +static inline void check_deadline(struct task_struct *p, struct rq *rq) +{ + if (p->time_slice < RESCHED_US || batch_task(p)) + time_slice_expired(p, rq); +} + +/* + * Task selection with skiplists is a simple matter of picking off the first + * task in the sorted list, an O(1) operation. The lookup is amortised O(1) + * being bound to the number of processors. + * + * Runqueues are selectively locked based on their unlocked data and then + * unlocked if not needed. At most 3 locks will be held at any time and are + * released as soon as they're no longer needed. All balancing between CPUs + * is thus done here in an extremely simple first come best fit manner. + * + * This iterates over runqueues in cache locality order. In interactive mode + * it iterates over all CPUs and finds the task with the best key/deadline. + * In non-interactive mode it will only take a task if it's from the current + * runqueue or a runqueue with more tasks than the current one with a better + * key/deadline. + */ +#ifdef CONFIG_SMP +static inline struct task_struct +*earliest_deadline_task(struct rq *rq, int cpu, struct task_struct *idle) +{ + struct rq *locked = NULL, *chosen = NULL; + struct task_struct *edt = idle; + int i, best_entries = 0; + u64 best_key = ~0ULL; + + for (i = 0; i < num_possible_cpus(); i++) { + struct rq *other_rq = rq_order(rq, i); + int entries = other_rq->sl->entries; + skiplist_node *next; + + /* + * Check for queued entres lockless first. The local runqueue + * is locked so entries will always be accurate. + */ + if (!sched_interactive) { + /* + * Don't reschedule balance across nodes unless the CPU + * is idle. + */ + if (edt != idle && rq->cpu_locality[other_rq->cpu] > 3) + break; + if (entries <= best_entries) + continue; + } else if (!entries) + continue; + + /* if (i) implies other_rq != rq */ + if (i) { + /* Check for best id queued lockless first */ + if (other_rq->best_key >= best_key) + continue; + + if (unlikely(!trylock_rq(rq, other_rq))) + continue; + + /* Need to reevaluate entries after locking */ + entries = other_rq->sl->entries; + if (unlikely(!entries)) { + unlock_rq(other_rq); + continue; + } + } + + next = &other_rq->node; + /* + * In interactive mode we check beyond the best entry on other + * runqueues if we can't get the best for smt or affinity + * reasons. + */ + while ((next = next->next[0]) != &other_rq->node) { + struct task_struct *p; + u64 key = next->key; + + /* Reevaluate key after locking */ + if (key >= best_key) + break; + + p = next->value; + if (!smt_schedule(p, rq)) { + if (i && !sched_interactive) + break; + continue; + } + + /* Make sure affinity is ok */ + if (i) { + if (needs_other_cpu(p, cpu)) { + if (sched_interactive) + continue; + break; + } + /* From this point on p is the best so far */ + if (locked) + unlock_rq(locked); + chosen = locked = other_rq; + } + best_entries = entries; + best_key = key; + edt = p; + break; + } + /* rq->preempting is a hint only as the state may have changed + * since it was set with the resched call but if we have met + * the condition we can break out here. */ + if (edt == rq->preempting) + break; + if (i && other_rq != chosen) + unlock_rq(other_rq); + } + + if (likely(edt != idle)) + take_task(rq, cpu, edt); + + if (locked) + unlock_rq(locked); + + rq->preempting = NULL; + + return edt; +} +#else /* CONFIG_SMP */ +static inline struct task_struct +*earliest_deadline_task(struct rq *rq, int cpu, struct task_struct *idle) +{ + struct task_struct *edt; + + if (unlikely(!rq->sl->entries)) + return idle; + edt = rq->node.next[0]->value; + take_task(rq, cpu, edt); + return edt; +} +#endif /* CONFIG_SMP */ + +/* + * Print scheduling while atomic bug: + */ +static noinline void __schedule_bug(struct task_struct *prev) +{ + /* Save this before calling printk(), since that will clobber it */ + unsigned long preempt_disable_ip = get_preempt_disable_ip(current); + + if (oops_in_progress) + return; + + printk(KERN_ERR "BUG: scheduling while atomic: %s/%d/0x%08x\n", + prev->comm, prev->pid, preempt_count()); + + debug_show_held_locks(prev); + print_modules(); + if (irqs_disabled()) + print_irqtrace_events(prev); + if (IS_ENABLED(CONFIG_DEBUG_PREEMPT) + && in_atomic_preempt_off()) { + pr_err("Preemption disabled at:"); + print_ip_sym(preempt_disable_ip); + pr_cont("\n"); + } + dump_stack(); + add_taint(TAINT_WARN, LOCKDEP_STILL_OK); +} + +/* + * Various schedule()-time debugging checks and statistics: + */ +static inline void schedule_debug(struct task_struct *prev) +{ +#ifdef CONFIG_SCHED_STACK_END_CHECK + if (task_stack_end_corrupted(prev)) + panic("corrupted stack end detected inside scheduler\n"); +#endif + + if (unlikely(in_atomic_preempt_off())) { + __schedule_bug(prev); + preempt_count_set(PREEMPT_DISABLED); + } + rcu_sleep_check(); + + profile_hit(SCHED_PROFILING, __builtin_return_address(0)); + + schedstat_inc(this_rq()->sched_count); +} + +/* + * The currently running task's information is all stored in rq local data + * which is only modified by the local CPU. + */ +static inline void set_rq_task(struct rq *rq, struct task_struct *p) +{ + if (p == rq->idle || p->policy == SCHED_FIFO) + hrexpiry_clear(rq); + else + hrexpiry_start(rq, US_TO_NS(p->time_slice)); + if (rq->clock - rq->last_tick > HALF_JIFFY_NS) + rq->dither = 0; + else + rq->dither = rq_dither(rq); + + rq->rq_deadline = p->deadline; + rq->rq_prio = p->prio; +#ifdef CONFIG_SMT_NICE + rq->rq_mm = p->mm; + rq->rq_smt_bias = p->smt_bias; +#endif +} + +#ifdef CONFIG_SMT_NICE +static void check_no_siblings(struct rq __maybe_unused *this_rq) {} +static void wake_no_siblings(struct rq __maybe_unused *this_rq) {} +static void (*check_siblings)(struct rq *this_rq) = &check_no_siblings; +static void (*wake_siblings)(struct rq *this_rq) = &wake_no_siblings; + +/* Iterate over smt siblings when we've scheduled a process on cpu and decide + * whether they should continue running or be descheduled. */ +static void check_smt_siblings(struct rq *this_rq) +{ + int other_cpu; + + for_each_cpu(other_cpu, &this_rq->thread_mask) { + struct task_struct *p; + struct rq *rq; + + rq = cpu_rq(other_cpu); + if (rq_idle(rq)) + continue; + p = rq->curr; + if (!smt_schedule(p, this_rq)) + resched_curr(rq); + } +} + +static void wake_smt_siblings(struct rq *this_rq) +{ + int other_cpu; + + for_each_cpu(other_cpu, &this_rq->thread_mask) { + struct rq *rq; + + rq = cpu_rq(other_cpu); + if (rq_idle(rq)) + resched_idle(rq); + } +} +#else +static void check_siblings(struct rq __maybe_unused *this_rq) {} +static void wake_siblings(struct rq __maybe_unused *this_rq) {} +#endif + +/* + * schedule() is the main scheduler function. + * + * The main means of driving the scheduler and thus entering this function are: + * + * 1. Explicit blocking: mutex, semaphore, waitqueue, etc. + * + * 2. TIF_NEED_RESCHED flag is checked on interrupt and userspace return + * paths. For example, see arch/x86/entry_64.S. + * + * To drive preemption between tasks, the scheduler sets the flag in timer + * interrupt handler scheduler_tick(). + * + * 3. Wakeups don't really cause entry into schedule(). They add a + * task to the run-queue and that's it. + * + * Now, if the new task added to the run-queue preempts the current + * task, then the wakeup sets TIF_NEED_RESCHED and schedule() gets + * called on the nearest possible occasion: + * + * - If the kernel is preemptible (CONFIG_PREEMPT=y): + * + * - in syscall or exception context, at the next outmost + * preempt_enable(). (this might be as soon as the wake_up()'s + * spin_unlock()!) + * + * - in IRQ context, return from interrupt-handler to + * preemptible context + * + * - If the kernel is not preemptible (CONFIG_PREEMPT is not set) + * then at the next: + * + * - cond_resched() call + * - explicit schedule() call + * - return from syscall or exception to user-space + * - return from interrupt-handler to user-space + * + * WARNING: must be called with preemption disabled! + */ +static void __sched notrace __schedule(bool preempt) +{ + struct task_struct *prev, *next, *idle; + unsigned long *switch_count; + bool deactivate = false; + struct rq *rq; + u64 niffies; + int cpu; + + cpu = smp_processor_id(); + rq = cpu_rq(cpu); + prev = rq->curr; + idle = rq->idle; + + schedule_debug(prev); + + local_irq_disable(); + rcu_note_context_switch(preempt); + + /* + * Make sure that signal_pending_state()->signal_pending() below + * can't be reordered with __set_current_state(TASK_INTERRUPTIBLE) + * done by the caller to avoid the race with signal_wake_up(). + */ + smp_mb__before_spinlock(); + rq_lock(rq); +#ifdef CONFIG_SMP + if (rq->preempt) { + /* + * Make sure resched_curr hasn't triggered a preemption + * locklessly on a task that has since scheduled away. Spurious + * wakeup of idle is okay though. + */ + if (unlikely(preempt && prev != idle && !test_tsk_need_resched(prev))) { + rq->preempt = NULL; + clear_preempt_need_resched(); + rq_unlock_irq(rq); + return; + } + rq->preempt = NULL; + } +#endif + + switch_count = &prev->nivcsw; + if (!preempt && prev->state) { + if (unlikely(signal_pending_state(prev->state, prev))) { + prev->state = TASK_RUNNING; + } else { + deactivate = true; + prev->on_rq = 0; + + if (prev->in_iowait) { + atomic_inc(&rq->nr_iowait); + delayacct_blkio_start(); + } + + /* + * If a worker is going to sleep, notify and + * ask workqueue whether it wants to wake up a + * task to maintain concurrency. If so, wake + * up the task. + */ + if (prev->flags & PF_WQ_WORKER) { + struct task_struct *to_wakeup; + + to_wakeup = wq_worker_sleeping(prev); + if (to_wakeup) + try_to_wake_up_local(to_wakeup); + } + } + switch_count = &prev->nvcsw; + } + + /* + * Store the niffy value here for use by the next task's last_ran + * below to avoid losing niffies due to update_clocks being called + * again after this point. + */ + update_clocks(rq); + niffies = rq->niffies; + update_cpu_clock_switch(rq, prev); + + clear_tsk_need_resched(prev); + clear_preempt_need_resched(); + + if (idle != prev) { + check_deadline(prev, rq); + return_task(prev, rq, cpu, deactivate); + } + + next = earliest_deadline_task(rq, cpu, idle); + if (likely(next->prio != PRIO_LIMIT)) + clear_cpuidle_map(cpu); + else { + set_cpuidle_map(cpu); + update_load_avg(rq, 0); + } + + set_rq_task(rq, next); + next->last_ran = niffies; + + if (likely(prev != next)) { + /* + * Don't reschedule an idle task or deactivated tasks + */ + if (prev != idle && !deactivate) + resched_suitable_idle(prev); + if (next != idle) + check_siblings(rq); + else + wake_siblings(rq); + rq->nr_switches++; + rq->curr = next; + ++*switch_count; + + trace_sched_switch(preempt, prev, next); + context_switch(rq, prev, next); /* unlocks the rq */ + } else { + check_siblings(rq); + rq_unlock(rq); + do_pending_softirq(rq, next); + local_irq_enable(); + } +} + +void __noreturn do_task_dead(void) +{ + /* + * The setting of TASK_RUNNING by try_to_wake_up() may be delayed + * when the following two conditions become true. + * - There is race condition of mmap_sem (It is acquired by + * exit_mm()), and + * - SMI occurs before setting TASK_RUNINNG. + * (or hypervisor of virtual machine switches to other guest) + * As a result, we may become TASK_RUNNING after becoming TASK_DEAD + * + * To avoid it, we have to wait for releasing tsk->pi_lock which + * is held by try_to_wake_up() + */ + smp_mb(); + raw_spin_unlock_wait(¤t->pi_lock); + + /* Causes final put_task_struct in finish_task_switch(). */ + __set_current_state(TASK_DEAD); + + /* Tell freezer to ignore us: */ + current->flags |= PF_NOFREEZE; + __schedule(false); + BUG(); + + /* Avoid "noreturn function does return" - but don't continue if BUG() is a NOP: */ + for (;;) + cpu_relax(); +} + +static inline void sched_submit_work(struct task_struct *tsk) +{ + if (!tsk->state || tsk_is_pi_blocked(tsk) || + preempt_count() || + signal_pending_state(tsk->state, tsk)) + return; + + /* + * If we are going to sleep and we have plugged IO queued, + * make sure to submit it to avoid deadlocks. + */ + if (blk_needs_flush_plug(tsk)) + blk_schedule_flush_plug(tsk); +} + +asmlinkage __visible void __sched schedule(void) +{ + struct task_struct *tsk = current; + + sched_submit_work(tsk); + do { + preempt_disable(); + __schedule(false); + sched_preempt_enable_no_resched(); + } while (need_resched()); +} + +EXPORT_SYMBOL(schedule); + +/* + * synchronize_rcu_tasks() makes sure that no task is stuck in preempted + * state (have scheduled out non-voluntarily) by making sure that all + * tasks have either left the run queue or have gone into user space. + * As idle tasks do not do either, they must not ever be preempted + * (schedule out non-voluntarily). + * + * schedule_idle() is similar to schedule_preempt_disable() except that it + * never enables preemption because it does not call sched_submit_work(). + */ +void __sched schedule_idle(void) +{ + /* + * As this skips calling sched_submit_work(), which the idle task does + * regardless because that function is a nop when the task is in a + * TASK_RUNNING state, make sure this isn't used someplace that the + * current task can be in any other state. Note, idle is always in the + * TASK_RUNNING state. + */ + WARN_ON_ONCE(current->state); + do { + __schedule(false); + } while (need_resched()); +} + +#ifdef CONFIG_CONTEXT_TRACKING +asmlinkage __visible void __sched schedule_user(void) +{ + /* + * If we come here after a random call to set_need_resched(), + * or we have been woken up remotely but the IPI has not yet arrived, + * we haven't yet exited the RCU idle mode. Do it here manually until + * we find a better solution. + * + * NB: There are buggy callers of this function. Ideally we + * should warn if prev_state != IN_USER, but that will trigger + * too frequently to make sense yet. + */ + enum ctx_state prev_state = exception_enter(); + schedule(); + exception_exit(prev_state); +} +#endif + +/** + * schedule_preempt_disabled - called with preemption disabled + * + * Returns with preemption disabled. Note: preempt_count must be 1 + */ +void __sched schedule_preempt_disabled(void) +{ + sched_preempt_enable_no_resched(); + schedule(); + preempt_disable(); +} + +static void __sched notrace preempt_schedule_common(void) +{ + do { + /* + * Because the function tracer can trace preempt_count_sub() + * and it also uses preempt_enable/disable_notrace(), if + * NEED_RESCHED is set, the preempt_enable_notrace() called + * by the function tracer will call this function again and + * cause infinite recursion. + * + * Preemption must be disabled here before the function + * tracer can trace. Break up preempt_disable() into two + * calls. One to disable preemption without fear of being + * traced. The other to still record the preemption latency, + * which can also be traced by the function tracer. + */ + preempt_disable_notrace(); + preempt_latency_start(1); + __schedule(true); + preempt_latency_stop(1); + preempt_enable_no_resched_notrace(); + + /* + * Check again in case we missed a preemption opportunity + * between schedule and now. + */ + } while (need_resched()); +} + +#ifdef CONFIG_PREEMPT +/* + * this is the entry point to schedule() from in-kernel preemption + * off of preempt_enable. Kernel preemptions off return from interrupt + * occur there and call schedule directly. + */ +asmlinkage __visible void __sched notrace preempt_schedule(void) +{ + /* + * If there is a non-zero preempt_count or interrupts are disabled, + * we do not want to preempt the current task. Just return.. + */ + if (likely(!preemptible())) + return; + + preempt_schedule_common(); +} +NOKPROBE_SYMBOL(preempt_schedule); +EXPORT_SYMBOL(preempt_schedule); + +/** + * preempt_schedule_notrace - preempt_schedule called by tracing + * + * The tracing infrastructure uses preempt_enable_notrace to prevent + * recursion and tracing preempt enabling caused by the tracing + * infrastructure itself. But as tracing can happen in areas coming + * from userspace or just about to enter userspace, a preempt enable + * can occur before user_exit() is called. This will cause the scheduler + * to be called when the system is still in usermode. + * + * To prevent this, the preempt_enable_notrace will use this function + * instead of preempt_schedule() to exit user context if needed before + * calling the scheduler. + */ +asmlinkage __visible void __sched notrace preempt_schedule_notrace(void) +{ + enum ctx_state prev_ctx; + + if (likely(!preemptible())) + return; + + do { + /* + * Because the function tracer can trace preempt_count_sub() + * and it also uses preempt_enable/disable_notrace(), if + * NEED_RESCHED is set, the preempt_enable_notrace() called + * by the function tracer will call this function again and + * cause infinite recursion. + * + * Preemption must be disabled here before the function + * tracer can trace. Break up preempt_disable() into two + * calls. One to disable preemption without fear of being + * traced. The other to still record the preemption latency, + * which can also be traced by the function tracer. + */ + preempt_disable_notrace(); + preempt_latency_start(1); + /* + * Needs preempt disabled in case user_exit() is traced + * and the tracer calls preempt_enable_notrace() causing + * an infinite recursion. + */ + prev_ctx = exception_enter(); + __schedule(true); + exception_exit(prev_ctx); + + preempt_latency_stop(1); + preempt_enable_no_resched_notrace(); + } while (need_resched()); +} +EXPORT_SYMBOL_GPL(preempt_schedule_notrace); + +#endif /* CONFIG_PREEMPT */ + +/* + * this is the entry point to schedule() from kernel preemption + * off of irq context. + * Note, that this is called and return with irqs disabled. This will + * protect us against recursive calling from irq. + */ +asmlinkage __visible void __sched preempt_schedule_irq(void) +{ + enum ctx_state prev_state; + + /* Catch callers which need to be fixed */ + BUG_ON(preempt_count() || !irqs_disabled()); + + prev_state = exception_enter(); + + do { + preempt_disable(); + local_irq_enable(); + __schedule(true); + local_irq_disable(); + sched_preempt_enable_no_resched(); + } while (need_resched()); + + exception_exit(prev_state); +} + +int default_wake_function(wait_queue_entry_t *curr, unsigned mode, int wake_flags, + void *key) +{ + return try_to_wake_up(curr->private, mode, wake_flags); +} +EXPORT_SYMBOL(default_wake_function); + +#ifdef CONFIG_RT_MUTEXES + +static inline int __rt_effective_prio(struct task_struct *pi_task, int prio) +{ + if (pi_task) + prio = min(prio, pi_task->prio); + + return prio; +} + +static inline int rt_effective_prio(struct task_struct *p, int prio) +{ + struct task_struct *pi_task = rt_mutex_get_top_task(p); + + return __rt_effective_prio(pi_task, prio); +} + +/* + * rt_mutex_setprio - set the current priority of a task + * @p: task to boost + * @pi_task: donor task + * + * This function changes the 'effective' priority of a task. It does + * not touch ->normal_prio like __setscheduler(). + * + * Used by the rt_mutex code to implement priority inheritance + * logic. Call site only calls if the priority of the task changed. + */ +void rt_mutex_setprio(struct task_struct *p, struct task_struct *pi_task) +{ + int prio, oldprio; + struct rq *rq; + + /* XXX used to be waiter->prio, not waiter->task->prio */ + prio = __rt_effective_prio(pi_task, p->normal_prio); + + /* + * If nothing changed; bail early. + */ + if (p->pi_top_task == pi_task && prio == p->prio) + return; + + rq = __task_rq_lock(p); + update_rq_clock(rq); + /* + * Set under pi_lock && rq->lock, such that the value can be used under + * either lock. + * + * Note that there is loads of tricky to make this pointer cache work + * right. rt_mutex_slowunlock()+rt_mutex_postunlock() work together to + * ensure a task is de-boosted (pi_task is set to NULL) before the + * task is allowed to run again (and can exit). This ensures the pointer + * points to a blocked task -- which guaratees the task is present. + */ + p->pi_top_task = pi_task; + + /* + * For FIFO/RR we only need to set prio, if that matches we're done. + */ + if (prio == p->prio) + goto out_unlock; + + /* + * Idle task boosting is a nono in general. There is one + * exception, when PREEMPT_RT and NOHZ is active: + * + * The idle task calls get_next_timer_interrupt() and holds + * the timer wheel base->lock on the CPU and another CPU wants + * to access the timer (probably to cancel it). We can safely + * ignore the boosting request, as the idle CPU runs this code + * with interrupts disabled and will complete the lock + * protected section without being interrupted. So there is no + * real need to boost. + */ + if (unlikely(p == rq->idle)) { + WARN_ON(p != rq->curr); + WARN_ON(p->pi_blocked_on); + goto out_unlock; + } + + trace_sched_pi_setprio(p, pi_task); + oldprio = p->prio; + p->prio = prio; + if (task_running(rq, p)){ + if (prio > oldprio) + resched_task(p); + } else if (task_queued(p)) { + dequeue_task(rq, p, DEQUEUE_SAVE); + enqueue_task(rq, p, ENQUEUE_RESTORE); + if (prio < oldprio) + try_preempt(p, rq); + } +out_unlock: + __task_rq_unlock(rq); +} +#else +static inline int rt_effective_prio(struct task_struct *p, int prio) +{ + return prio; +} +#endif + +/* + * Adjust the deadline for when the priority is to change, before it's + * changed. + */ +static inline void adjust_deadline(struct task_struct *p, int new_prio) +{ + p->deadline += static_deadline_diff(new_prio) - task_deadline_diff(p); +} + +void set_user_nice(struct task_struct *p, long nice) +{ + int new_static, old_static; + unsigned long flags; + struct rq *rq; + + if (task_nice(p) == nice || nice < MIN_NICE || nice > MAX_NICE) + return; + new_static = NICE_TO_PRIO(nice); + /* + * We have to be careful, if called from sys_setpriority(), + * the task might be in the middle of scheduling on another CPU. + */ + rq = task_rq_lock(p, &flags); + update_rq_clock(rq); + + /* + * The RT priorities are set via sched_setscheduler(), but we still + * allow the 'normal' nice value to be set - but as expected + * it wont have any effect on scheduling until the task is + * not SCHED_NORMAL/SCHED_BATCH: + */ + if (has_rt_policy(p)) { + p->static_prio = new_static; + goto out_unlock; + } + + adjust_deadline(p, new_static); + old_static = p->static_prio; + p->static_prio = new_static; + p->prio = effective_prio(p); + + if (task_queued(p)) { + dequeue_task(rq, p, DEQUEUE_SAVE); + enqueue_task(rq, p, ENQUEUE_RESTORE); + if (new_static < old_static) + try_preempt(p, rq); + } else if (task_running(rq, p)) { + set_rq_task(rq, p); + if (old_static < new_static) + resched_task(p); + } +out_unlock: + task_rq_unlock(rq, p, &flags); +} +EXPORT_SYMBOL(set_user_nice); + +/* + * can_nice - check if a task can reduce its nice value + * @p: task + * @nice: nice value + */ +int can_nice(const struct task_struct *p, const int nice) +{ + /* Convert nice value [19,-20] to rlimit style value [1,40] */ + int nice_rlim = nice_to_rlimit(nice); + + return (nice_rlim <= task_rlimit(p, RLIMIT_NICE) || + capable(CAP_SYS_NICE)); +} + +#ifdef __ARCH_WANT_SYS_NICE + +/* + * sys_nice - change the priority of the current process. + * @increment: priority increment + * + * sys_setpriority is a more generic, but much slower function that + * does similar things. + */ +SYSCALL_DEFINE1(nice, int, increment) +{ + long nice, retval; + + /* + * Setpriority might change our priority at the same moment. + * We don't have to worry. Conceptually one call occurs first + * and we have a single winner. + */ + + increment = clamp(increment, -NICE_WIDTH, NICE_WIDTH); + nice = task_nice(current) + increment; + + nice = clamp_val(nice, MIN_NICE, MAX_NICE); + if (increment < 0 && !can_nice(current, nice)) + return -EPERM; + + retval = security_task_setnice(current, nice); + if (retval) + return retval; + + set_user_nice(current, nice); + return 0; +} + +#endif + +/** + * task_prio - return the priority value of a given task. + * @p: the task in question. + * + * Return: The priority value as seen by users in /proc. + * RT tasks are offset by -100. Normal tasks are centered around 1, value goes + * from 0 (SCHED_ISO) up to 82 (nice +19 SCHED_IDLEPRIO). + */ +int task_prio(const struct task_struct *p) +{ + int delta, prio = p->prio - MAX_RT_PRIO; + + /* rt tasks and iso tasks */ + if (prio <= 0) + goto out; + + /* Convert to ms to avoid overflows */ + delta = NS_TO_MS(p->deadline - task_rq(p)->niffies); + if (unlikely(delta < 0)) + delta = 0; + delta = delta * 40 / ms_longest_deadline_diff(); + if (delta <= 80) + prio += delta; + if (idleprio_task(p)) + prio += 40; +out: + return prio; +} + +/** + * idle_cpu - is a given CPU idle currently? + * @cpu: the processor in question. + * + * Return: 1 if the CPU is currently idle. 0 otherwise. + */ +int idle_cpu(int cpu) +{ + return cpu_curr(cpu) == cpu_rq(cpu)->idle; +} + +/** + * idle_task - return the idle task for a given CPU. + * @cpu: the processor in question. + * + * Return: The idle task for the CPU @cpu. + */ +struct task_struct *idle_task(int cpu) +{ + return cpu_rq(cpu)->idle; +} + +/** + * find_process_by_pid - find a process with a matching PID value. + * @pid: the pid in question. + * + * The task of @pid, if found. %NULL otherwise. + */ +static inline struct task_struct *find_process_by_pid(pid_t pid) +{ + return pid ? find_task_by_vpid(pid) : current; +} + +/* Actually do priority change: must hold rq lock. */ +static void __setscheduler(struct task_struct *p, struct rq *rq, int policy, + int prio, bool keep_boost) +{ + int oldrtprio, oldprio; + + p->policy = policy; + oldrtprio = p->rt_priority; + p->rt_priority = prio; + p->normal_prio = normal_prio(p); + oldprio = p->prio; + /* + * Keep a potential priority boosting if called from + * sched_setscheduler(). + */ + p->prio = normal_prio(p); + if (keep_boost) + p->prio = rt_effective_prio(p, p->prio); + + if (task_running(rq, p)) { + set_rq_task(rq, p); + resched_task(p); + } else if (task_queued(p)) { + dequeue_task(rq, p, DEQUEUE_SAVE); + enqueue_task(rq, p, ENQUEUE_RESTORE); + if (p->prio < oldprio || p->rt_priority > oldrtprio) + try_preempt(p, rq); + } +} + +/* + * Check the target process has a UID that matches the current process's + */ +static bool check_same_owner(struct task_struct *p) +{ + const struct cred *cred = current_cred(), *pcred; + bool match; + + rcu_read_lock(); + pcred = __task_cred(p); + match = (uid_eq(cred->euid, pcred->euid) || + uid_eq(cred->euid, pcred->uid)); + rcu_read_unlock(); + return match; +} + +static int +__sched_setscheduler(struct task_struct *p, int policy, + const struct sched_param *param, bool user, bool pi) +{ + struct sched_param zero_param = { .sched_priority = 0 }; + unsigned long flags, rlim_rtprio = 0; + int retval, oldpolicy = -1; + int reset_on_fork; + struct rq *rq; + + /* The pi code expects interrupts enabled */ + BUG_ON(pi && in_interrupt()); + + if (is_rt_policy(policy) && !capable(CAP_SYS_NICE)) { + unsigned long lflags; + + if (!lock_task_sighand(p, &lflags)) + return -ESRCH; + rlim_rtprio = task_rlimit(p, RLIMIT_RTPRIO); + unlock_task_sighand(p, &lflags); + if (rlim_rtprio) + goto recheck; + /* + * If the caller requested an RT policy without having the + * necessary rights, we downgrade the policy to SCHED_ISO. + * We also set the parameter to zero to pass the checks. + */ + policy = SCHED_ISO; + param = &zero_param; + } +recheck: + /* Double check policy once rq lock held */ + if (policy < 0) { + reset_on_fork = p->sched_reset_on_fork; + policy = oldpolicy = p->policy; + } else { + reset_on_fork = !!(policy & SCHED_RESET_ON_FORK); + policy &= ~SCHED_RESET_ON_FORK; + + if (!SCHED_RANGE(policy)) + return -EINVAL; + } + + /* + * Valid priorities for SCHED_FIFO and SCHED_RR are + * 1..MAX_USER_RT_PRIO-1, valid priority for SCHED_NORMAL and + * SCHED_BATCH is 0. + */ + if (param->sched_priority < 0 || + (p->mm && param->sched_priority > MAX_USER_RT_PRIO - 1) || + (!p->mm && param->sched_priority > MAX_RT_PRIO - 1)) + return -EINVAL; + if (is_rt_policy(policy) != (param->sched_priority != 0)) + return -EINVAL; + + /* + * Allow unprivileged RT tasks to decrease priority: + */ + if (user && !capable(CAP_SYS_NICE)) { + if (is_rt_policy(policy)) { + unsigned long rlim_rtprio = + task_rlimit(p, RLIMIT_RTPRIO); + + /* Can't set/change the rt policy */ + if (policy != p->policy && !rlim_rtprio) + return -EPERM; + + /* Can't increase priority */ + if (param->sched_priority > p->rt_priority && + param->sched_priority > rlim_rtprio) + return -EPERM; + } else { + switch (p->policy) { + /* + * Can only downgrade policies but not back to + * SCHED_NORMAL + */ + case SCHED_ISO: + if (policy == SCHED_ISO) + goto out; + if (policy != SCHED_NORMAL) + return -EPERM; + break; + case SCHED_BATCH: + if (policy == SCHED_BATCH) + goto out; + if (policy != SCHED_IDLEPRIO) + return -EPERM; + break; + case SCHED_IDLEPRIO: + if (policy == SCHED_IDLEPRIO) + goto out; + return -EPERM; + default: + break; + } + } + + /* Can't change other user's priorities */ + if (!check_same_owner(p)) + return -EPERM; + + /* Normal users shall not reset the sched_reset_on_fork flag: */ + if (p->sched_reset_on_fork && !reset_on_fork) + return -EPERM; + } + + if (user) { + retval = security_task_setscheduler(p); + if (retval) + return retval; + } + + /* + * Make sure no PI-waiters arrive (or leave) while we are + * changing the priority of the task: + * + * To be able to change p->policy safely, the runqueue lock must be + * held. + */ + rq = task_rq_lock(p, &flags); + update_rq_clock(rq); + + /* + * Changing the policy of the stop threads its a very bad idea: + */ + if (p == rq->stop) { + task_rq_unlock(rq, p, &flags); + return -EINVAL; + } + + /* + * If not changing anything there's no need to proceed further: + */ + if (unlikely(policy == p->policy && (!is_rt_policy(policy) || + param->sched_priority == p->rt_priority))) { + task_rq_unlock(rq, p, &flags); + return 0; + } + + /* Re-check policy now with rq lock held */ + if (unlikely(oldpolicy != -1 && oldpolicy != p->policy)) { + policy = oldpolicy = -1; + task_rq_unlock(rq, p, &flags); + goto recheck; + } + p->sched_reset_on_fork = reset_on_fork; + + __setscheduler(p, rq, policy, param->sched_priority, pi); + task_rq_unlock(rq, p, &flags); + + if (pi) + rt_mutex_adjust_pi(p); +out: + return 0; +} + +/** + * sched_setscheduler - change the scheduling policy and/or RT priority of a thread. + * @p: the task in question. + * @policy: new policy. + * @param: structure containing the new RT priority. + * + * Return: 0 on success. An error code otherwise. + * + * NOTE that the task may be already dead. + */ +int sched_setscheduler(struct task_struct *p, int policy, + const struct sched_param *param) +{ + return __sched_setscheduler(p, policy, param, true, true); +} + +EXPORT_SYMBOL_GPL(sched_setscheduler); + +int sched_setattr(struct task_struct *p, const struct sched_attr *attr) +{ + const struct sched_param param = { .sched_priority = attr->sched_priority }; + int policy = attr->sched_policy; + + return __sched_setscheduler(p, policy, ¶m, true, true); +} +EXPORT_SYMBOL_GPL(sched_setattr); + +/** + * sched_setscheduler_nocheck - change the scheduling policy and/or RT priority of a thread from kernelspace. + * @p: the task in question. + * @policy: new policy. + * @param: structure containing the new RT priority. + * + * Just like sched_setscheduler, only don't bother checking if the + * current context has permission. For example, this is needed in + * stop_machine(): we create temporary high priority worker threads, + * but our caller might not have that capability. + * + * Return: 0 on success. An error code otherwise. + */ +int sched_setscheduler_nocheck(struct task_struct *p, int policy, + const struct sched_param *param) +{ + return __sched_setscheduler(p, policy, param, false, true); +} +EXPORT_SYMBOL_GPL(sched_setscheduler_nocheck); + +static int +do_sched_setscheduler(pid_t pid, int policy, struct sched_param __user *param) +{ + struct sched_param lparam; + struct task_struct *p; + int retval; + + if (!param || pid < 0) + return -EINVAL; + if (copy_from_user(&lparam, param, sizeof(struct sched_param))) + return -EFAULT; + + rcu_read_lock(); + retval = -ESRCH; + p = find_process_by_pid(pid); + if (p != NULL) + retval = sched_setscheduler(p, policy, &lparam); + rcu_read_unlock(); + + return retval; +} + +/* + * Mimics kernel/events/core.c perf_copy_attr(). + */ +static int sched_copy_attr(struct sched_attr __user *uattr, + struct sched_attr *attr) +{ + u32 size; + int ret; + + if (!access_ok(VERIFY_WRITE, uattr, SCHED_ATTR_SIZE_VER0)) + return -EFAULT; + + /* Zero the full structure, so that a short copy will be nice: */ + memset(attr, 0, sizeof(*attr)); + + ret = get_user(size, &uattr->size); + if (ret) + return ret; + + /* Bail out on silly large: */ + if (size > PAGE_SIZE) + goto err_size; + + /* ABI compatibility quirk: */ + if (!size) + size = SCHED_ATTR_SIZE_VER0; + + if (size < SCHED_ATTR_SIZE_VER0) + goto err_size; + + /* + * If we're handed a bigger struct than we know of, + * ensure all the unknown bits are 0 - i.e. new + * user-space does not rely on any kernel feature + * extensions we dont know about yet. + */ + if (size > sizeof(*attr)) { + unsigned char __user *addr; + unsigned char __user *end; + unsigned char val; + + addr = (void __user *)uattr + sizeof(*attr); + end = (void __user *)uattr + size; + + for (; addr < end; addr++) { + ret = get_user(val, addr); + if (ret) + return ret; + if (val) + goto err_size; + } + size = sizeof(*attr); + } + + ret = copy_from_user(attr, uattr, size); + if (ret) + return -EFAULT; + + /* + * XXX: Do we want to be lenient like existing syscalls; or do we want + * to be strict and return an error on out-of-bounds values? + */ + attr->sched_nice = clamp(attr->sched_nice, -20, 19); + + /* sched/core.c uses zero here but we already know ret is zero */ + return 0; + +err_size: + put_user(sizeof(*attr), &uattr->size); + return -E2BIG; +} + +/* + * sched_setparam() passes in -1 for its policy, to let the functions + * it calls know not to change it. + */ +#define SETPARAM_POLICY -1 + +/** + * sys_sched_setscheduler - set/change the scheduler policy and RT priority + * @pid: the pid in question. + * @policy: new policy. + * @param: structure containing the new RT priority. + * + * Return: 0 on success. An error code otherwise. + */ +SYSCALL_DEFINE3(sched_setscheduler, pid_t, pid, int, policy, struct sched_param __user *, param) +{ + if (policy < 0) + return -EINVAL; + + return do_sched_setscheduler(pid, policy, param); +} + +/** + * sys_sched_setparam - set/change the RT priority of a thread + * @pid: the pid in question. + * @param: structure containing the new RT priority. + * + * Return: 0 on success. An error code otherwise. + */ +SYSCALL_DEFINE2(sched_setparam, pid_t, pid, struct sched_param __user *, param) +{ + return do_sched_setscheduler(pid, SETPARAM_POLICY, param); +} + +/** + * sys_sched_setattr - same as above, but with extended sched_attr + * @pid: the pid in question. + * @uattr: structure containing the extended parameters. + */ +SYSCALL_DEFINE3(sched_setattr, pid_t, pid, struct sched_attr __user *, uattr, + unsigned int, flags) +{ + struct sched_attr attr; + struct task_struct *p; + int retval; + + if (!uattr || pid < 0 || flags) + return -EINVAL; + + retval = sched_copy_attr(uattr, &attr); + if (retval) + return retval; + + if ((int)attr.sched_policy < 0) + return -EINVAL; + + rcu_read_lock(); + retval = -ESRCH; + p = find_process_by_pid(pid); + if (p != NULL) + retval = sched_setattr(p, &attr); + rcu_read_unlock(); + + return retval; +} + +/** + * sys_sched_getscheduler - get the policy (scheduling class) of a thread + * @pid: the pid in question. + * + * Return: On success, the policy of the thread. Otherwise, a negative error + * code. + */ +SYSCALL_DEFINE1(sched_getscheduler, pid_t, pid) +{ + struct task_struct *p; + int retval = -EINVAL; + + if (pid < 0) + goto out_nounlock; + + retval = -ESRCH; + rcu_read_lock(); + p = find_process_by_pid(pid); + if (p) { + retval = security_task_getscheduler(p); + if (!retval) + retval = p->policy; + } + rcu_read_unlock(); + +out_nounlock: + return retval; +} + +/** + * sys_sched_getscheduler - get the RT priority of a thread + * @pid: the pid in question. + * @param: structure containing the RT priority. + * + * Return: On success, 0 and the RT priority is in @param. Otherwise, an error + * code. + */ +SYSCALL_DEFINE2(sched_getparam, pid_t, pid, struct sched_param __user *, param) +{ + struct sched_param lp = { .sched_priority = 0 }; + struct task_struct *p; + int retval = -EINVAL; + + if (!param || pid < 0) + goto out_nounlock; + + rcu_read_lock(); + p = find_process_by_pid(pid); + retval = -ESRCH; + if (!p) + goto out_unlock; + + retval = security_task_getscheduler(p); + if (retval) + goto out_unlock; + + if (has_rt_policy(p)) + lp.sched_priority = p->rt_priority; + rcu_read_unlock(); + + /* + * This one might sleep, we cannot do it with a spinlock held ... + */ + retval = copy_to_user(param, &lp, sizeof(*param)) ? -EFAULT : 0; + +out_nounlock: + return retval; + +out_unlock: + rcu_read_unlock(); + return retval; +} + +static int sched_read_attr(struct sched_attr __user *uattr, + struct sched_attr *attr, + unsigned int usize) +{ + int ret; + + if (!access_ok(VERIFY_WRITE, uattr, usize)) + return -EFAULT; + + /* + * If we're handed a smaller struct than we know of, + * ensure all the unknown bits are 0 - i.e. old + * user-space does not get uncomplete information. + */ + if (usize < sizeof(*attr)) { + unsigned char *addr; + unsigned char *end; + + addr = (void *)attr + usize; + end = (void *)attr + sizeof(*attr); + + for (; addr < end; addr++) { + if (*addr) + return -EFBIG; + } + + attr->size = usize; + } + + ret = copy_to_user(uattr, attr, attr->size); + if (ret) + return -EFAULT; + + /* sched/core.c uses zero here but we already know ret is zero */ + return ret; +} + +/** + * sys_sched_getattr - similar to sched_getparam, but with sched_attr + * @pid: the pid in question. + * @uattr: structure containing the extended parameters. + * @size: sizeof(attr) for fwd/bwd comp. + * @flags: for future extension. + */ +SYSCALL_DEFINE4(sched_getattr, pid_t, pid, struct sched_attr __user *, uattr, + unsigned int, size, unsigned int, flags) +{ + struct sched_attr attr = { + .size = sizeof(struct sched_attr), + }; + struct task_struct *p; + int retval; + + if (!uattr || pid < 0 || size > PAGE_SIZE || + size < SCHED_ATTR_SIZE_VER0 || flags) + return -EINVAL; + + rcu_read_lock(); + p = find_process_by_pid(pid); + retval = -ESRCH; + if (!p) + goto out_unlock; + + retval = security_task_getscheduler(p); + if (retval) + goto out_unlock; + + attr.sched_policy = p->policy; + if (rt_task(p)) + attr.sched_priority = p->rt_priority; + else + attr.sched_nice = task_nice(p); + + rcu_read_unlock(); + + retval = sched_read_attr(uattr, &attr, size); + return retval; + +out_unlock: + rcu_read_unlock(); + return retval; +} + +long sched_setaffinity(pid_t pid, const struct cpumask *in_mask) +{ + cpumask_var_t cpus_allowed, new_mask; + struct task_struct *p; + int retval; + + rcu_read_lock(); + + p = find_process_by_pid(pid); + if (!p) { + rcu_read_unlock(); + return -ESRCH; + } + + /* Prevent p going away */ + get_task_struct(p); + rcu_read_unlock(); + + if (p->flags & PF_NO_SETAFFINITY) { + retval = -EINVAL; + goto out_put_task; + } + if (!alloc_cpumask_var(&cpus_allowed, GFP_KERNEL)) { + retval = -ENOMEM; + goto out_put_task; + } + if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) { + retval = -ENOMEM; + goto out_free_cpus_allowed; + } + retval = -EPERM; + if (!check_same_owner(p)) { + rcu_read_lock(); + if (!ns_capable(__task_cred(p)->user_ns, CAP_SYS_NICE)) { + rcu_read_unlock(); + goto out_unlock; + } + rcu_read_unlock(); + } + + retval = security_task_setscheduler(p); + if (retval) + goto out_unlock; + + cpuset_cpus_allowed(p, cpus_allowed); + cpumask_and(new_mask, in_mask, cpus_allowed); +again: + retval = __set_cpus_allowed_ptr(p, new_mask, true); + + if (!retval) { + cpuset_cpus_allowed(p, cpus_allowed); + if (!cpumask_subset(new_mask, cpus_allowed)) { + /* + * We must have raced with a concurrent cpuset + * update. Just reset the cpus_allowed to the + * cpuset's cpus_allowed + */ + cpumask_copy(new_mask, cpus_allowed); + goto again; + } + } +out_unlock: + free_cpumask_var(new_mask); +out_free_cpus_allowed: + free_cpumask_var(cpus_allowed); +out_put_task: + put_task_struct(p); + return retval; +} + +static int get_user_cpu_mask(unsigned long __user *user_mask_ptr, unsigned len, + cpumask_t *new_mask) +{ + if (len < cpumask_size()) + cpumask_clear(new_mask); + else if (len > cpumask_size()) + len = cpumask_size(); + + return copy_from_user(new_mask, user_mask_ptr, len) ? -EFAULT : 0; +} + + +/** + * sys_sched_setaffinity - set the CPU affinity of a process + * @pid: pid of the process + * @len: length in bytes of the bitmask pointed to by user_mask_ptr + * @user_mask_ptr: user-space pointer to the new CPU mask + * + * Return: 0 on success. An error code otherwise. + */ +SYSCALL_DEFINE3(sched_setaffinity, pid_t, pid, unsigned int, len, + unsigned long __user *, user_mask_ptr) +{ + cpumask_var_t new_mask; + int retval; + + if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) + return -ENOMEM; + + retval = get_user_cpu_mask(user_mask_ptr, len, new_mask); + if (retval == 0) + retval = sched_setaffinity(pid, new_mask); + free_cpumask_var(new_mask); + return retval; +} + +long sched_getaffinity(pid_t pid, cpumask_t *mask) +{ + struct task_struct *p; + unsigned long flags; + int retval; + + get_online_cpus(); + rcu_read_lock(); + + retval = -ESRCH; + p = find_process_by_pid(pid); + if (!p) + goto out_unlock; + + retval = security_task_getscheduler(p); + if (retval) + goto out_unlock; + + raw_spin_lock_irqsave(&p->pi_lock, flags); + cpumask_and(mask, &p->cpus_allowed, cpu_active_mask); + raw_spin_unlock_irqrestore(&p->pi_lock, flags); + +out_unlock: + rcu_read_unlock(); + put_online_cpus(); + + return retval; +} + +/** + * sys_sched_getaffinity - get the CPU affinity of a process + * @pid: pid of the process + * @len: length in bytes of the bitmask pointed to by user_mask_ptr + * @user_mask_ptr: user-space pointer to hold the current CPU mask + * + * Return: 0 on success. An error code otherwise. + */ +SYSCALL_DEFINE3(sched_getaffinity, pid_t, pid, unsigned int, len, + unsigned long __user *, user_mask_ptr) +{ + int ret; + cpumask_var_t mask; + + if ((len * BITS_PER_BYTE) < nr_cpu_ids) + return -EINVAL; + if (len & (sizeof(unsigned long)-1)) + return -EINVAL; + + if (!alloc_cpumask_var(&mask, GFP_KERNEL)) + return -ENOMEM; + + ret = sched_getaffinity(pid, mask); + if (ret == 0) { + size_t retlen = min_t(size_t, len, cpumask_size()); + + if (copy_to_user(user_mask_ptr, mask, retlen)) + ret = -EFAULT; + else + ret = retlen; + } + free_cpumask_var(mask); + + return ret; +} + +/** + * sys_sched_yield - yield the current processor to other threads. + * + * This function yields the current CPU to other tasks. It does this by + * scheduling away the current task. If it still has the earliest deadline + * it will be scheduled again as the next task. + * + * Return: 0. + */ +SYSCALL_DEFINE0(sched_yield) +{ + struct rq *rq; + + if (!sched_yield_type) + goto out; + + local_irq_disable(); + rq = this_rq(); + rq_lock(rq); + + if (sched_yield_type > 1) + time_slice_expired(current, rq); + schedstat_inc(rq->yld_count); + + /* + * Since we are going to call schedule() anyway, there's + * no need to preempt or enable interrupts: + */ + preempt_disable(); + rq_unlock(rq); + sched_preempt_enable_no_resched(); + + schedule(); +out: + return 0; +} + +#ifndef CONFIG_PREEMPT +int __sched _cond_resched(void) +{ + if (should_resched(0)) { + preempt_schedule_common(); + return 1; + } + return 0; +} +EXPORT_SYMBOL(_cond_resched); +#endif + +/* + * __cond_resched_lock() - if a reschedule is pending, drop the given lock, + * call schedule, and on return reacquire the lock. + * + * This works OK both with and without CONFIG_PREEMPT. We do strange low-level + * operations here to prevent schedule() from being called twice (once via + * spin_unlock(), once by hand). + */ +int __cond_resched_lock(spinlock_t *lock) +{ + int resched = should_resched(PREEMPT_LOCK_OFFSET); + int ret = 0; + + lockdep_assert_held(lock); + + if (spin_needbreak(lock) || resched) { + spin_unlock(lock); + if (resched) + preempt_schedule_common(); + else + cpu_relax(); + ret = 1; + spin_lock(lock); + } + return ret; +} +EXPORT_SYMBOL(__cond_resched_lock); + +int __sched __cond_resched_softirq(void) +{ + BUG_ON(!in_softirq()); + + if (should_resched(SOFTIRQ_DISABLE_OFFSET)) { + local_bh_enable(); + preempt_schedule_common(); + local_bh_disable(); + return 1; + } + return 0; +} +EXPORT_SYMBOL(__cond_resched_softirq); + +/** + * yield - yield the current processor to other threads. + * + * Do not ever use this function, there's a 99% chance you're doing it wrong. + * + * The scheduler is at all times free to pick the calling task as the most + * eligible task to run, if removing the yield() call from your code breaks + * it, its already broken. + * + * Typical broken usage is: + * + * while (!event) + * yield(); + * + * where one assumes that yield() will let 'the other' process run that will + * make event true. If the current task is a SCHED_FIFO task that will never + * happen. Never use yield() as a progress guarantee!! + * + * If you want to use yield() to wait for something, use wait_event(). + * If you want to use yield() to be 'nice' for others, use cond_resched(). + * If you still want to use yield(), do not! + */ +void __sched yield(void) +{ + set_current_state(TASK_RUNNING); + sys_sched_yield(); +} +EXPORT_SYMBOL(yield); + +/** + * yield_to - yield the current processor to another thread in + * your thread group, or accelerate that thread toward the + * processor it's on. + * @p: target task + * @preempt: whether task preemption is allowed or not + * + * It's the caller's job to ensure that the target task struct + * can't go away on us before we can do any checks. + * + * Return: + * true (>0) if we indeed boosted the target task. + * false (0) if we failed to boost the target. + * -ESRCH if there's no task to yield to. + */ +int __sched yield_to(struct task_struct *p, bool preempt) +{ + struct task_struct *rq_p; + struct rq *rq, *p_rq; + unsigned long flags; + int yielded = 0; + + local_irq_save(flags); + rq = this_rq(); + +again: + p_rq = task_rq(p); + /* + * If we're the only runnable task on the rq and target rq also + * has only one task, there's absolutely no point in yielding. + */ + if (task_running(p_rq, p) || p->state) { + yielded = -ESRCH; + goto out_irq; + } + + double_rq_lock(rq, p_rq); + if (unlikely(task_rq(p) != p_rq)) { + double_rq_unlock(rq, p_rq); + goto again; + } + + yielded = 1; + schedstat_inc(rq->yld_count); + rq_p = rq->curr; + if (p->deadline > rq_p->deadline) + p->deadline = rq_p->deadline; + p->time_slice += rq_p->time_slice; + if (p->time_slice > timeslice()) + p->time_slice = timeslice(); + time_slice_expired(rq_p, rq); + if (preempt && rq != p_rq) + resched_task(p_rq->curr); + double_rq_unlock(rq, p_rq); +out_irq: + local_irq_restore(flags); + + if (yielded > 0) + schedule(); + return yielded; +} +EXPORT_SYMBOL_GPL(yield_to); + +int io_schedule_prepare(void) +{ + int old_iowait = current->in_iowait; + + current->in_iowait = 1; + blk_schedule_flush_plug(current); + + return old_iowait; +} + +void io_schedule_finish(int token) +{ + current->in_iowait = token; +} + +/* + * This task is about to go to sleep on IO. Increment rq->nr_iowait so + * that process accounting knows that this is a task in IO wait state. + * + * But don't do that if it is a deliberate, throttling IO wait (this task + * has set its backing_dev_info: the queue against which it should throttle) + */ + +long __sched io_schedule_timeout(long timeout) +{ + int token; + long ret; + + token = io_schedule_prepare(); + ret = schedule_timeout(timeout); + io_schedule_finish(token); + + return ret; +} +EXPORT_SYMBOL(io_schedule_timeout); + +void io_schedule(void) +{ + int token; + + token = io_schedule_prepare(); + schedule(); + io_schedule_finish(token); +} +EXPORT_SYMBOL(io_schedule); + +/** + * sys_sched_get_priority_max - return maximum RT priority. + * @policy: scheduling class. + * + * Return: On success, this syscall returns the maximum + * rt_priority that can be used by a given scheduling class. + * On failure, a negative error code is returned. + */ +SYSCALL_DEFINE1(sched_get_priority_max, int, policy) +{ + int ret = -EINVAL; + + switch (policy) { + case SCHED_FIFO: + case SCHED_RR: + ret = MAX_USER_RT_PRIO-1; + break; + case SCHED_NORMAL: + case SCHED_BATCH: + case SCHED_ISO: + case SCHED_IDLEPRIO: + ret = 0; + break; + } + return ret; +} + +/** + * sys_sched_get_priority_min - return minimum RT priority. + * @policy: scheduling class. + * + * Return: On success, this syscall returns the minimum + * rt_priority that can be used by a given scheduling class. + * On failure, a negative error code is returned. + */ +SYSCALL_DEFINE1(sched_get_priority_min, int, policy) +{ + int ret = -EINVAL; + + switch (policy) { + case SCHED_FIFO: + case SCHED_RR: + ret = 1; + break; + case SCHED_NORMAL: + case SCHED_BATCH: + case SCHED_ISO: + case SCHED_IDLEPRIO: + ret = 0; + break; + } + return ret; +} + +/** + * sys_sched_rr_get_interval - return the default timeslice of a process. + * @pid: pid of the process. + * @interval: userspace pointer to the timeslice value. + * + * + * Return: On success, 0 and the timeslice is in @interval. Otherwise, + * an error code. + */ +SYSCALL_DEFINE2(sched_rr_get_interval, pid_t, pid, + struct timespec __user *, interval) +{ + struct task_struct *p; + unsigned int time_slice; + unsigned long flags; + struct timespec t; + struct rq *rq; + int retval; + + if (pid < 0) + return -EINVAL; + + retval = -ESRCH; + rcu_read_lock(); + p = find_process_by_pid(pid); + if (!p) + goto out_unlock; + + retval = security_task_getscheduler(p); + if (retval) + goto out_unlock; + + rq = task_rq_lock(p, &flags); + time_slice = p->policy == SCHED_FIFO ? 0 : MS_TO_NS(task_timeslice(p)); + task_rq_unlock(rq, p, &flags); + + rcu_read_unlock(); + t = ns_to_timespec(time_slice); + retval = copy_to_user(interval, &t, sizeof(t)) ? -EFAULT : 0; + return retval; + +out_unlock: + rcu_read_unlock(); + return retval; +} + +static const char stat_nam[] = TASK_STATE_TO_CHAR_STR; + +void sched_show_task(struct task_struct *p) +{ + unsigned long free = 0; + int ppid; + unsigned long state = p->state; + + /* Make sure the string lines up properly with the number of task states: */ + BUILD_BUG_ON(sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1); + + if (!try_get_task_stack(p)) + return; + if (state) + state = __ffs(state) + 1; + printk(KERN_INFO "%-15.15s %c", p->comm, + state < sizeof(stat_nam) - 1 ? stat_nam[state] : '?'); + if (state == TASK_RUNNING) + printk(KERN_CONT " running task "); +#ifdef CONFIG_DEBUG_STACK_USAGE + free = stack_not_used(p); +#endif + ppid = 0; + rcu_read_lock(); + if (pid_alive(p)) + ppid = task_pid_nr(rcu_dereference(p->real_parent)); + rcu_read_unlock(); + printk(KERN_CONT "%5lu %5d %6d 0x%08lx\n", free, + task_pid_nr(p), ppid, + (unsigned long)task_thread_info(p)->flags); + + print_worker_info(KERN_INFO, p); + show_stack(p, NULL); + put_task_stack(p); +} + +void show_state_filter(unsigned long state_filter) +{ + struct task_struct *g, *p; + +#if BITS_PER_LONG == 32 + printk(KERN_INFO + " task PC stack pid father\n"); +#else + printk(KERN_INFO + " task PC stack pid father\n"); +#endif + rcu_read_lock(); + for_each_process_thread(g, p) { + /* + * reset the NMI-timeout, listing all files on a slow + * console might take a lot of time: + * Also, reset softlockup watchdogs on all CPUs, because + * another CPU might be blocked waiting for us to process + * an IPI. + */ + touch_nmi_watchdog(); + touch_all_softlockup_watchdogs(); + if (!state_filter || (p->state & state_filter)) + sched_show_task(p); + } + + rcu_read_unlock(); + /* + * Only show locks if all tasks are dumped: + */ + if (!state_filter) + debug_show_all_locks(); +} + +void dump_cpu_task(int cpu) +{ + pr_info("Task dump for CPU %d:\n", cpu); + sched_show_task(cpu_curr(cpu)); +} + +#ifdef CONFIG_SMP +void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_mask) +{ + cpumask_copy(&p->cpus_allowed, new_mask); + p->nr_cpus_allowed = cpumask_weight(new_mask); +} + +void __do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) +{ + struct rq *rq = task_rq(p); + + lockdep_assert_held(&p->pi_lock); + + cpumask_copy(&p->cpus_allowed, new_mask); + + if (task_queued(p)) { + /* + * Because __kthread_bind() calls this on blocked tasks without + * holding rq->lock. + */ + lockdep_assert_held(&rq->lock); + } +} + +/* + * Calling do_set_cpus_allowed from outside the scheduler code should not be + * called on a running or queued task. We should be holding pi_lock. + */ +void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) +{ + __do_set_cpus_allowed(p, new_mask); + if (needs_other_cpu(p, task_cpu(p))) { + struct rq *rq; + + rq = __task_rq_lock(p); + set_task_cpu(p, valid_task_cpu(p)); + resched_task(p); + __task_rq_unlock(rq); + } +} +#endif + +/** + * init_idle - set up an idle thread for a given CPU + * @idle: task in question + * @cpu: cpu the idle task belongs to + * + * NOTE: this function does not set the idle thread's NEED_RESCHED + * flag, to make booting more robust. + */ +void init_idle(struct task_struct *idle, int cpu) +{ + struct rq *rq = cpu_rq(cpu); + unsigned long flags; + + raw_spin_lock_irqsave(&idle->pi_lock, flags); + raw_spin_lock(&rq->lock); + idle->last_ran = rq->niffies; + time_slice_expired(idle, rq); + idle->state = TASK_RUNNING; + /* Setting prio to illegal value shouldn't matter when never queued */ + idle->prio = PRIO_LIMIT; + + kasan_unpoison_task_stack(idle); + +#ifdef CONFIG_SMP + /* + * It's possible that init_idle() gets called multiple times on a task, + * in that case do_set_cpus_allowed() will not do the right thing. + * + * And since this is boot we can forgo the serialisation. + */ + set_cpus_allowed_common(idle, cpumask_of(cpu)); +#ifdef CONFIG_SMT_NICE + idle->smt_bias = 0; +#endif +#endif + set_rq_task(rq, idle); + + /* Silence PROVE_RCU */ + rcu_read_lock(); + set_task_cpu(idle, cpu); + rcu_read_unlock(); + + rq->curr = rq->idle = idle; + idle->on_rq = TASK_ON_RQ_QUEUED; + raw_spin_unlock(&rq->lock); + raw_spin_unlock_irqrestore(&idle->pi_lock, flags); + + /* Set the preempt count _outside_ the spinlocks! */ + init_idle_preempt_count(idle, cpu); + + ftrace_graph_init_idle_task(idle, cpu); + vtime_init_idle(idle, cpu); +#ifdef CONFIG_SMP + sprintf(idle->comm, "%s/%d", INIT_TASK_COMM, cpu); +#endif +} + +int cpuset_cpumask_can_shrink(const struct cpumask __maybe_unused *cur, + const struct cpumask __maybe_unused *trial) +{ + return 1; +} + +int task_can_attach(struct task_struct *p, + const struct cpumask *cs_cpus_allowed) +{ + int ret = 0; + + /* + * Kthreads which disallow setaffinity shouldn't be moved + * to a new cpuset; we don't want to change their CPU + * affinity and isolating such threads by their set of + * allowed nodes is unnecessary. Thus, cpusets are not + * applicable for such threads. This prevents checking for + * success of set_cpus_allowed_ptr() on all attached tasks + * before cpus_allowed may be changed. + */ + if (p->flags & PF_NO_SETAFFINITY) + ret = -EINVAL; + + return ret; +} + +void resched_cpu(int cpu) +{ + struct rq *rq = cpu_rq(cpu); + unsigned long flags; + + rq_lock_irqsave(rq, &flags); + resched_task(cpu_curr(cpu)); + rq_unlock_irqrestore(rq, &flags); +} + +#ifdef CONFIG_SMP +#ifdef CONFIG_NO_HZ_COMMON +void nohz_balance_enter_idle(int cpu) +{ +} + +void select_nohz_load_balancer(int stop_tick) +{ +} + +void set_cpu_sd_state_idle(void) {} + +/* + * In the semi idle case, use the nearest busy CPU for migrating timers + * from an idle CPU. This is good for power-savings. + * + * We don't do similar optimization for completely idle system, as + * selecting an idle CPU will add more delays to the timers than intended + * (as that CPU's timer base may not be uptodate wrt jiffies etc). + */ +int get_nohz_timer_target(void) +{ + int i, cpu = smp_processor_id(); + struct sched_domain *sd; + + if (!idle_cpu(cpu) && is_housekeeping_cpu(cpu)) + return cpu; + + rcu_read_lock(); + for_each_domain(cpu, sd) { + for_each_cpu(i, sched_domain_span(sd)) { + if (cpu == i) + continue; + + if (!idle_cpu(i) && is_housekeeping_cpu(i)) { + cpu = i; + cpu = i; + goto unlock; + } + } + } + + if (!is_housekeeping_cpu(cpu)) + cpu = housekeeping_any_cpu(); +unlock: + rcu_read_unlock(); + return cpu; +} + +/* + * When add_timer_on() enqueues a timer into the timer wheel of an + * idle CPU then this timer might expire before the next timer event + * which is scheduled to wake up that CPU. In case of a completely + * idle system the next event might even be infinite time into the + * future. wake_up_idle_cpu() ensures that the CPU is woken up and + * leaves the inner idle loop so the newly added timer is taken into + * account when the CPU goes back to idle and evaluates the timer + * wheel for the next timer event. + */ +void wake_up_idle_cpu(int cpu) +{ + if (cpu == smp_processor_id()) + return; + + if (set_nr_and_not_polling(cpu_rq(cpu)->idle)) + smp_sched_reschedule(cpu); + else + trace_sched_wake_idle_without_ipi(cpu); +} + +static bool wake_up_full_nohz_cpu(int cpu) +{ + /* + * We just need the target to call irq_exit() and re-evaluate + * the next tick. The nohz full kick at least implies that. + * If needed we can still optimize that later with an + * empty IRQ. + */ + if (cpu_is_offline(cpu)) + return true; /* Don't try to wake offline CPUs. */ + if (tick_nohz_full_cpu(cpu)) { + if (cpu != smp_processor_id() || + tick_nohz_tick_stopped()) + tick_nohz_full_kick_cpu(cpu); + return true; + } + + return false; +} + +/* + * Wake up the specified CPU. If the CPU is going offline, it is the + * caller's responsibility to deal with the lost wakeup, for example, + * by hooking into the CPU_DEAD notifier like timers and hrtimers do. + */ +void wake_up_nohz_cpu(int cpu) +{ + if (!wake_up_full_nohz_cpu(cpu)) + wake_up_idle_cpu(cpu); +} +#endif /* CONFIG_NO_HZ_COMMON */ + +/* + * Change a given task's CPU affinity. Migrate the thread to a + * proper CPU and schedule it away if the CPU it's executing on + * is removed from the allowed bitmask. + * + * NOTE: the caller must have a valid reference to the task, the + * task must not exit() & deallocate itself prematurely. The + * call is not atomic; no spinlocks may be held. + */ +static int __set_cpus_allowed_ptr(struct task_struct *p, + const struct cpumask *new_mask, bool check) +{ + const struct cpumask *cpu_valid_mask = cpu_active_mask; + bool queued = false, running_wrong = false, kthread; + struct cpumask old_mask; + unsigned long flags; + struct rq *rq; + int ret = 0; + + rq = task_rq_lock(p, &flags); + update_rq_clock(rq); + + kthread = !!(p->flags & PF_KTHREAD); + if (kthread) { + /* + * Kernel threads are allowed on online && !active CPUs + */ + cpu_valid_mask = cpu_online_mask; + } + + /* + * Must re-check here, to close a race against __kthread_bind(), + * sched_setaffinity() is not guaranteed to observe the flag. + */ + if (check && (p->flags & PF_NO_SETAFFINITY)) { + ret = -EINVAL; + goto out; + } + + cpumask_copy(&old_mask, &p->cpus_allowed); + if (cpumask_equal(&old_mask, new_mask)) + goto out; + + if (!cpumask_intersects(new_mask, cpu_valid_mask)) { + ret = -EINVAL; + goto out; + } + + queued = task_queued(p); + __do_set_cpus_allowed(p, new_mask); + + if (kthread) { + /* + * For kernel threads that do indeed end up on online && + * !active we want to ensure they are strict per-CPU threads. + */ + WARN_ON(cpumask_intersects(new_mask, cpu_online_mask) && + !cpumask_intersects(new_mask, cpu_active_mask) && + p->nr_cpus_allowed != 1); + } + + /* Can the task run on the task's current CPU? If so, we're done */ + if (cpumask_test_cpu(task_cpu(p), new_mask)) + goto out; + + if (task_running(rq, p)) { + /* Task is running on the wrong cpu now, reschedule it. */ + if (rq == this_rq()) { + set_tsk_need_resched(p); + running_wrong = true; + } else + resched_task(p); + } else { + int cpu = cpumask_any_and(cpu_valid_mask, new_mask); + + if (queued) { + /* + * Switch runqueue locks after dequeueing the task + * here while still holding the pi_lock to be holding + * the correct lock for enqueueing. + */ + dequeue_task(rq, p, 0); + rq_unlock(rq); + + rq = cpu_rq(cpu); + rq_lock(rq); + } + set_task_cpu(p, cpu); + if (queued) + enqueue_task(rq, p, 0); + } + if (queued) + try_preempt(p, rq); + if (running_wrong) + preempt_disable(); +out: + task_rq_unlock(rq, p, &flags); + + if (running_wrong) { + __schedule(true); + preempt_enable(); + } + + return ret; +} + +int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask) +{ + return __set_cpus_allowed_ptr(p, new_mask, false); +} +EXPORT_SYMBOL_GPL(set_cpus_allowed_ptr); + +#ifdef CONFIG_HOTPLUG_CPU +/* + * Run through task list and find tasks affined to the dead cpu, then remove + * that cpu from the list, enable cpu0 and set the zerobound flag. Must hold + * cpu 0 and src_cpu's runqueue locks. + */ +static void bind_zero(int src_cpu) +{ + struct task_struct *p, *t; + struct rq *rq0; + int bound = 0; + + if (src_cpu == 0) + return; + + rq0 = cpu_rq(0); + + do_each_thread(t, p) { + if (cpumask_test_cpu(src_cpu, &p->cpus_allowed)) { + bool local = (task_cpu(p) == src_cpu); + struct rq *rq = task_rq(p); + + /* task_running is the cpu stopper thread */ + if (local && task_running(rq, p)) + continue; + atomic_clear_cpu(src_cpu, &p->cpus_allowed); + atomic_set_cpu(0, &p->cpus_allowed); + p->zerobound = true; + bound++; + if (local) { + bool queued = task_queued(p); + + if (queued) + dequeue_task(rq, p, 0); + set_task_cpu(p, 0); + if (queued) + enqueue_task(rq0, p, 0); + } + } + } while_each_thread(t, p); + + if (bound) { + printk(KERN_INFO "Removed affinity for %d processes to cpu %d\n", + bound, src_cpu); + } +} + +/* Find processes with the zerobound flag and reenable their affinity for the + * CPU coming alive. */ +static void unbind_zero(int src_cpu) +{ + int unbound = 0, zerobound = 0; + struct task_struct *p, *t; + + if (src_cpu == 0) + return; + + do_each_thread(t, p) { + if (!p->mm) + p->zerobound = false; + if (p->zerobound) { + unbound++; + cpumask_set_cpu(src_cpu, &p->cpus_allowed); + /* Once every CPU affinity has been re-enabled, remove + * the zerobound flag */ + if (cpumask_subset(cpu_possible_mask, &p->cpus_allowed)) { + p->zerobound = false; + zerobound++; + } + } + } while_each_thread(t, p); + + if (unbound) { + printk(KERN_INFO "Added affinity for %d processes to cpu %d\n", + unbound, src_cpu); + } + if (zerobound) { + printk(KERN_INFO "Released forced binding to cpu0 for %d processes\n", + zerobound); + } +} + +/* + * Ensure that the idle task is using init_mm right before its cpu goes + * offline. + */ +void idle_task_exit(void) +{ + struct mm_struct *mm = current->active_mm; + + BUG_ON(cpu_online(smp_processor_id())); + + if (mm != &init_mm) { + switch_mm(mm, &init_mm, current); + finish_arch_post_lock_switch(); + } + mmdrop(mm); +} +#else /* CONFIG_HOTPLUG_CPU */ +static void unbind_zero(int src_cpu) {} +#endif /* CONFIG_HOTPLUG_CPU */ + +void sched_set_stop_task(int cpu, struct task_struct *stop) +{ + struct sched_param stop_param = { .sched_priority = STOP_PRIO }; + struct sched_param start_param = { .sched_priority = 0 }; + struct task_struct *old_stop = cpu_rq(cpu)->stop; + + if (stop) { + /* + * Make it appear like a SCHED_FIFO task, its something + * userspace knows about and won't get confused about. + * + * Also, it will make PI more or less work without too + * much confusion -- but then, stop work should not + * rely on PI working anyway. + */ + sched_setscheduler_nocheck(stop, SCHED_FIFO, &stop_param); + } + + cpu_rq(cpu)->stop = stop; + + if (old_stop) { + /* + * Reset it back to a normal scheduling policy so that + * it can die in pieces. + */ + sched_setscheduler_nocheck(old_stop, SCHED_NORMAL, &start_param); + } +} + +#if defined(CONFIG_SCHED_DEBUG) && defined(CONFIG_SYSCTL) + +static struct ctl_table sd_ctl_dir[] = { + { + .procname = "sched_domain", + .mode = 0555, + }, + {} +}; + +static struct ctl_table sd_ctl_root[] = { + { + .procname = "kernel", + .mode = 0555, + .child = sd_ctl_dir, + }, + {} +}; + +static struct ctl_table *sd_alloc_ctl_entry(int n) +{ + struct ctl_table *entry = + kcalloc(n, sizeof(struct ctl_table), GFP_KERNEL); + + return entry; +} + +static void sd_free_ctl_entry(struct ctl_table **tablep) +{ + struct ctl_table *entry; + + /* + * In the intermediate directories, both the child directory and + * procname are dynamically allocated and could fail but the mode + * will always be set. In the lowest directory the names are + * static strings and all have proc handlers. + */ + for (entry = *tablep; entry->mode; entry++) { + if (entry->child) + sd_free_ctl_entry(&entry->child); + if (entry->proc_handler == NULL) + kfree(entry->procname); + } + + kfree(*tablep); + *tablep = NULL; +} + +#define CPU_LOAD_IDX_MAX 5 +static int min_load_idx = 0; +static int max_load_idx = CPU_LOAD_IDX_MAX-1; + +static void +set_table_entry(struct ctl_table *entry, + const char *procname, void *data, int maxlen, + umode_t mode, proc_handler *proc_handler, + bool load_idx) +{ + entry->procname = procname; + entry->data = data; + entry->maxlen = maxlen; + entry->mode = mode; + entry->proc_handler = proc_handler; + + if (load_idx) { + entry->extra1 = &min_load_idx; + entry->extra2 = &max_load_idx; + } +} + +static struct ctl_table * +sd_alloc_ctl_domain_table(struct sched_domain *sd) +{ + struct ctl_table *table = sd_alloc_ctl_entry(14); + + if (table == NULL) + return NULL; + + set_table_entry(&table[0], "min_interval", &sd->min_interval, + sizeof(long), 0644, proc_doulongvec_minmax, false); + set_table_entry(&table[1], "max_interval", &sd->max_interval, + sizeof(long), 0644, proc_doulongvec_minmax, false); + set_table_entry(&table[2], "busy_idx", &sd->busy_idx, + sizeof(int), 0644, proc_dointvec_minmax, true); + set_table_entry(&table[3], "idle_idx", &sd->idle_idx, + sizeof(int), 0644, proc_dointvec_minmax, true); + set_table_entry(&table[4], "newidle_idx", &sd->newidle_idx, + sizeof(int), 0644, proc_dointvec_minmax, true); + set_table_entry(&table[5], "wake_idx", &sd->wake_idx, + sizeof(int), 0644, proc_dointvec_minmax, true); + set_table_entry(&table[6], "forkexec_idx", &sd->forkexec_idx, + sizeof(int), 0644, proc_dointvec_minmax, true); + set_table_entry(&table[7], "busy_factor", &sd->busy_factor, + sizeof(int), 0644, proc_dointvec_minmax, false); + set_table_entry(&table[8], "imbalance_pct", &sd->imbalance_pct, + sizeof(int), 0644, proc_dointvec_minmax, false); + set_table_entry(&table[9], "cache_nice_tries", + &sd->cache_nice_tries, + sizeof(int), 0644, proc_dointvec_minmax, false); + set_table_entry(&table[10], "flags", &sd->flags, + sizeof(int), 0644, proc_dointvec_minmax, false); + set_table_entry(&table[11], "max_newidle_lb_cost", + &sd->max_newidle_lb_cost, + sizeof(long), 0644, proc_doulongvec_minmax, false); + set_table_entry(&table[12], "name", sd->name, + CORENAME_MAX_SIZE, 0444, proc_dostring, false); + /* &table[13] is terminator */ + + return table; +} + +static struct ctl_table *sd_alloc_ctl_cpu_table(int cpu) +{ + struct ctl_table *entry, *table; + struct sched_domain *sd; + int domain_num = 0, i; + char buf[32]; + + for_each_domain(cpu, sd) + domain_num++; + entry = table = sd_alloc_ctl_entry(domain_num + 1); + if (table == NULL) + return NULL; + + i = 0; + for_each_domain(cpu, sd) { + snprintf(buf, 32, "domain%d", i); + entry->procname = kstrdup(buf, GFP_KERNEL); + entry->mode = 0555; + entry->child = sd_alloc_ctl_domain_table(sd); + entry++; + i++; + } + return table; +} + +static struct ctl_table_header *sd_sysctl_header; +void register_sched_domain_sysctl(void) +{ + int i, cpu_num = num_possible_cpus(); + struct ctl_table *entry = sd_alloc_ctl_entry(cpu_num + 1); + char buf[32]; + + WARN_ON(sd_ctl_dir[0].child); + sd_ctl_dir[0].child = entry; + + if (entry == NULL) + return; + + for_each_possible_cpu(i) { + snprintf(buf, 32, "cpu%d", i); + entry->procname = kstrdup(buf, GFP_KERNEL); + entry->mode = 0555; + entry->child = sd_alloc_ctl_cpu_table(i); + entry++; + } + + WARN_ON(sd_sysctl_header); + sd_sysctl_header = register_sysctl_table(sd_ctl_root); +} + +/* may be called multiple times per register */ +void unregister_sched_domain_sysctl(void) +{ + unregister_sysctl_table(sd_sysctl_header); + sd_sysctl_header = NULL; + if (sd_ctl_dir[0].child) + sd_free_ctl_entry(&sd_ctl_dir[0].child); +} +#endif /* CONFIG_SYSCTL */ + +void set_rq_online(struct rq *rq) +{ + if (!rq->online) { + cpumask_set_cpu(cpu_of(rq), rq->rd->online); + rq->online = true; + } +} + +void set_rq_offline(struct rq *rq) +{ + if (rq->online) { + int cpu = cpu_of(rq); + + cpumask_clear_cpu(cpu, rq->rd->online); + rq->online = false; + clear_cpuidle_map(cpu); + } +} + +/* + * used to mark begin/end of suspend/resume: + */ +static int num_cpus_frozen; + +/* + * Update cpusets according to cpu_active mask. If cpusets are + * disabled, cpuset_update_active_cpus() becomes a simple wrapper + * around partition_sched_domains(). + * + * If we come here as part of a suspend/resume, don't touch cpusets because we + * want to restore it back to its original state upon resume anyway. + */ +static void cpuset_cpu_active(void) +{ + if (cpuhp_tasks_frozen) { + /* + * num_cpus_frozen tracks how many CPUs are involved in suspend + * resume sequence. As long as this is not the last online + * operation in the resume sequence, just build a single sched + * domain, ignoring cpusets. + */ + num_cpus_frozen--; + if (likely(num_cpus_frozen)) { + partition_sched_domains(1, NULL, NULL); + return; + } + /* + * This is the last CPU online operation. So fall through and + * restore the original sched domains by considering the + * cpuset configurations. + */ + } + + cpuset_update_active_cpus(); +} + +static int cpuset_cpu_inactive(unsigned int cpu) +{ + if (!cpuhp_tasks_frozen) { + cpuset_update_active_cpus(); + } else { + num_cpus_frozen++; + partition_sched_domains(1, NULL, NULL); + } + return 0; +} + +int sched_cpu_activate(unsigned int cpu) +{ + struct rq *rq = cpu_rq(cpu); + unsigned long flags; + + set_cpu_active(cpu, true); + + if (sched_smp_initialized) { + sched_domains_numa_masks_set(cpu); + cpuset_cpu_active(); + } + + /* + * Put the rq online, if not already. This happens: + * + * 1) In the early boot process, because we build the real domains + * after all CPUs have been brought up. + * + * 2) At runtime, if cpuset_cpu_active() fails to rebuild the + * domains. + */ + rq_lock_irqsave(rq, &flags); + if (rq->rd) { + BUG_ON(!cpumask_test_cpu(cpu, rq->rd->span)); + set_rq_online(rq); + } + unbind_zero(cpu); + rq_unlock_irqrestore(rq, &flags); + + return 0; +} + +int sched_cpu_deactivate(unsigned int cpu) +{ + int ret; + + set_cpu_active(cpu, false); + /* + * We've cleared cpu_active_mask, wait for all preempt-disabled and RCU + * users of this state to go away such that all new such users will + * observe it. + * + * Do sync before park smpboot threads to take care the rcu boost case. + */ + synchronize_rcu_mult(call_rcu, call_rcu_sched); + + if (!sched_smp_initialized) + return 0; + + ret = cpuset_cpu_inactive(cpu); + if (ret) { + set_cpu_active(cpu, true); + return ret; + } + sched_domains_numa_masks_clear(cpu); + return 0; +} + +int sched_cpu_starting(unsigned int __maybe_unused cpu) +{ + return 0; +} + +#ifdef CONFIG_HOTPLUG_CPU +int sched_cpu_dying(unsigned int cpu) +{ + struct rq *rq = cpu_rq(cpu); + unsigned long flags; + + local_irq_save(flags); + double_rq_lock(rq, cpu_rq(0)); + if (rq->rd) { + BUG_ON(!cpumask_test_cpu(cpu, rq->rd->span)); + set_rq_offline(rq); + } + bind_zero(cpu); + double_rq_unlock(rq, cpu_rq(0)); + sched_start_tick(rq, cpu); + hrexpiry_clear(rq); + local_irq_restore(flags); + + return 0; +} +#endif + +#if defined(CONFIG_SCHED_SMT) || defined(CONFIG_SCHED_MC) +/* + * Cheaper version of the below functions in case support for SMT and MC is + * compiled in but CPUs have no siblings. + */ +static bool sole_cpu_idle(struct rq *rq) +{ + return rq_idle(rq); +} +#endif +#ifdef CONFIG_SCHED_SMT +static const cpumask_t *thread_cpumask(int cpu) +{ + return topology_sibling_cpumask(cpu); +} +/* All this CPU's SMT siblings are idle */ +static bool siblings_cpu_idle(struct rq *rq) +{ + return cpumask_subset(&rq->thread_mask, &cpu_idle_map); +} +#endif +#ifdef CONFIG_SCHED_MC +static const cpumask_t *core_cpumask(int cpu) +{ + return topology_core_cpumask(cpu); +} +/* All this CPU's shared cache siblings are idle */ +static bool cache_cpu_idle(struct rq *rq) +{ + return cpumask_subset(&rq->core_mask, &cpu_idle_map); +} +#endif + +enum sched_domain_level { + SD_LV_NONE = 0, + SD_LV_SIBLING, + SD_LV_MC, + SD_LV_BOOK, + SD_LV_CPU, + SD_LV_NODE, + SD_LV_ALLNODES, + SD_LV_MAX +}; + +void __init sched_init_smp(void) +{ + struct sched_domain *sd; + int cpu, other_cpu; +#ifdef CONFIG_SCHED_SMT + bool smt_threads = false; +#endif + cpumask_var_t non_isolated_cpus; + struct rq *rq; + + alloc_cpumask_var(&non_isolated_cpus, GFP_KERNEL); + + sched_init_numa(); + + /* + * There's no userspace yet to cause hotplug operations; hence all the + * cpu masks are stable and all blatant races in the below code cannot + * happen. + */ + mutex_lock(&sched_domains_mutex); + sched_init_domains(cpu_active_mask); + cpumask_andnot(non_isolated_cpus, cpu_possible_mask, cpu_isolated_map); + if (cpumask_empty(non_isolated_cpus)) + cpumask_set_cpu(smp_processor_id(), non_isolated_cpus); + mutex_unlock(&sched_domains_mutex); + + /* Move init over to a non-isolated CPU */ + if (set_cpus_allowed_ptr(current, non_isolated_cpus) < 0) + BUG(); + free_cpumask_var(non_isolated_cpus); + + mutex_lock(&sched_domains_mutex); + local_irq_disable(); + lock_all_rqs(); + /* + * Set up the relative cache distance of each online cpu from each + * other in a simple array for quick lookup. Locality is determined + * by the closest sched_domain that CPUs are separated by. CPUs with + * shared cache in SMT and MC are treated as local. Separate CPUs + * (within the same package or physically) within the same node are + * treated as not local. CPUs not even in the same domain (different + * nodes) are treated as very distant. + */ + for_each_online_cpu(cpu) { + rq = cpu_rq(cpu); + + /* First check if this cpu is in the same node */ + for_each_domain(cpu, sd) { + if (sd->level > SD_LV_MC) + continue; + /* Set locality to local node if not already found lower */ + for_each_cpu(other_cpu, sched_domain_span(sd)) { + if (rq->cpu_locality[other_cpu] > 3) + rq->cpu_locality[other_cpu] = 3; + } + } + + /* + * Each runqueue has its own function in case it doesn't have + * siblings of its own allowing mixed topologies. + */ +#ifdef CONFIG_SCHED_MC + for_each_cpu(other_cpu, core_cpumask(cpu)) { + if (rq->cpu_locality[other_cpu] > 2) + rq->cpu_locality[other_cpu] = 2; + } + if (cpumask_weight(core_cpumask(cpu)) > 1) { + cpumask_copy(&rq->core_mask, core_cpumask(cpu)); + cpumask_clear_cpu(cpu, &rq->core_mask); + rq->cache_idle = cache_cpu_idle; + } +#endif +#ifdef CONFIG_SCHED_SMT + if (cpumask_weight(thread_cpumask(cpu)) > 1) { + cpumask_copy(&rq->thread_mask, thread_cpumask(cpu)); + cpumask_clear_cpu(cpu, &rq->thread_mask); + for_each_cpu(other_cpu, thread_cpumask(cpu)) + rq->cpu_locality[other_cpu] = 1; + rq->siblings_idle = siblings_cpu_idle; + smt_threads = true; + } +#endif + } + for_each_possible_cpu(cpu) { + int total_cpus = 1, locality; + + rq = cpu_rq(cpu); + for (locality = 1; locality <= 4; locality++) { + for_each_possible_cpu(other_cpu) { + if (rq->cpu_locality[other_cpu] == locality) + rq->rq_order[total_cpus++] = cpu_rq(other_cpu); + } + } + } +#ifdef CONFIG_SMT_NICE + if (smt_threads) { + check_siblings = &check_smt_siblings; + wake_siblings = &wake_smt_siblings; + smt_schedule = &smt_should_schedule; + } +#endif + unlock_all_rqs(); + local_irq_enable(); + mutex_unlock(&sched_domains_mutex); + + for_each_online_cpu(cpu) { + rq = cpu_rq(cpu); + + for_each_online_cpu(other_cpu) { + if (other_cpu <= cpu) + continue; + printk(KERN_DEBUG "MuQSS locality CPU %d to %d: %d\n", cpu, other_cpu, rq->cpu_locality[other_cpu]); + } + } + + sched_smp_initialized = true; +} +#else +void __init sched_init_smp(void) +{ + sched_smp_initialized = true; +} +#endif /* CONFIG_SMP */ + +int in_sched_functions(unsigned long addr) +{ + return in_lock_functions(addr) || + (addr >= (unsigned long)__sched_text_start + && addr < (unsigned long)__sched_text_end); +} + +#ifdef CONFIG_CGROUP_SCHED +/* task group related information */ +struct task_group { + struct cgroup_subsys_state css; + + struct rcu_head rcu; + struct list_head list; + + struct task_group *parent; + struct list_head siblings; + struct list_head children; +}; + +/* + * Default task group. + * Every task in system belongs to this group at bootup. + */ +struct task_group root_task_group; +LIST_HEAD(task_groups); + +/* Cacheline aligned slab cache for task_group */ +static struct kmem_cache *task_group_cache __read_mostly; +#endif /* CONFIG_CGROUP_SCHED */ + +void __init sched_init(void) +{ +#ifdef CONFIG_SMP + int cpu_ids; +#endif + int i; + struct rq *rq; + + sched_clock_init(); + + wait_bit_init(); + + prio_ratios[0] = 128; + for (i = 1 ; i < NICE_WIDTH ; i++) + prio_ratios[i] = prio_ratios[i - 1] * 11 / 10; + + skiplist_node_init(&init_task.node); + +#ifdef CONFIG_SMP + init_defrootdomain(); + cpumask_clear(&cpu_idle_map); +#else + uprq = &per_cpu(runqueues, 0); +#endif + +#ifdef CONFIG_CGROUP_SCHED + task_group_cache = KMEM_CACHE(task_group, 0); + + list_add(&root_task_group.list, &task_groups); + INIT_LIST_HEAD(&root_task_group.children); + INIT_LIST_HEAD(&root_task_group.siblings); +#endif /* CONFIG_CGROUP_SCHED */ + for_each_possible_cpu(i) { + rq = cpu_rq(i); + skiplist_init(&rq->node); + rq->sl = new_skiplist(&rq->node); + raw_spin_lock_init(&rq->lock); + rq->nr_running = 0; + rq->nr_uninterruptible = 0; + rq->nr_switches = 0; + rq->clock = rq->old_clock = rq->last_niffy = rq->niffies = 0; + rq->last_jiffy = jiffies; + rq->user_ns = rq->nice_ns = rq->softirq_ns = rq->system_ns = + rq->iowait_ns = rq->idle_ns = 0; + rq->dither = 0; + set_rq_task(rq, &init_task); + rq->iso_ticks = 0; + rq->iso_refractory = false; +#ifdef CONFIG_SMP + rq->sd = NULL; + rq->rd = NULL; + rq->online = false; + rq->cpu = i; + rq_attach_root(rq, &def_root_domain); +#endif + init_rq_hrexpiry(rq); + atomic_set(&rq->nr_iowait, 0); + } + +#ifdef CONFIG_SMP + cpu_ids = i; + /* + * Set the base locality for cpu cache distance calculation to + * "distant" (3). Make sure the distance from a CPU to itself is 0. + */ + for_each_possible_cpu(i) { + int j; + + rq = cpu_rq(i); +#ifdef CONFIG_SCHED_SMT + rq->siblings_idle = sole_cpu_idle; +#endif +#ifdef CONFIG_SCHED_MC + rq->cache_idle = sole_cpu_idle; +#endif + rq->cpu_locality = kmalloc(cpu_ids * sizeof(int *), GFP_ATOMIC); + for_each_possible_cpu(j) { + if (i == j) + rq->cpu_locality[j] = 0; + else + rq->cpu_locality[j] = 4; + } + rq->rq_order = kmalloc(cpu_ids * sizeof(struct rq *), GFP_ATOMIC); + rq->rq_order[0] = rq; + for (j = 1; j < cpu_ids; j++) + rq->rq_order[j] = cpu_rq(j); + } +#endif + + /* + * The boot idle thread does lazy MMU switching as well: + */ + mmgrab(&init_mm); + enter_lazy_tlb(&init_mm, current); + + /* + * Make us the idle thread. Technically, schedule() should not be + * called from this thread, however somewhere below it might be, + * but because we are the idle thread, we just pick up running again + * when this runqueue becomes "idle". + */ + init_idle(current, smp_processor_id()); + +#ifdef CONFIG_SMP + /* May be allocated at isolcpus cmdline parse time */ + if (cpu_isolated_map == NULL) + zalloc_cpumask_var(&cpu_isolated_map, GFP_NOWAIT); + idle_thread_set_boot_cpu(); +#endif /* SMP */ + + init_schedstats(); +} + +#ifdef CONFIG_DEBUG_ATOMIC_SLEEP +static inline int preempt_count_equals(int preempt_offset) +{ + int nested = preempt_count() + rcu_preempt_depth(); + + return (nested == preempt_offset); +} + +void __might_sleep(const char *file, int line, int preempt_offset) +{ + /* + * Blocking primitives will set (and therefore destroy) current->state, + * since we will exit with TASK_RUNNING make sure we enter with it, + * otherwise we will destroy state. + */ + WARN_ONCE(current->state != TASK_RUNNING && current->task_state_change, + "do not call blocking ops when !TASK_RUNNING; " + "state=%lx set at [<%p>] %pS\n", + current->state, + (void *)current->task_state_change, + (void *)current->task_state_change); + + ___might_sleep(file, line, preempt_offset); +} +EXPORT_SYMBOL(__might_sleep); + +void ___might_sleep(const char *file, int line, int preempt_offset) +{ + /* Ratelimiting timestamp: */ + static unsigned long prev_jiffy; + + unsigned long preempt_disable_ip; + + /* WARN_ON_ONCE() by default, no rate limit required: */ + rcu_sleep_check(); + + if ((preempt_count_equals(preempt_offset) && !irqs_disabled() && + !is_idle_task(current)) || + system_state == SYSTEM_BOOTING || system_state > SYSTEM_RUNNING || + oops_in_progress) + return; + + if (time_before(jiffies, prev_jiffy + HZ) && prev_jiffy) + return; + prev_jiffy = jiffies; + + /* Save this before calling printk(), since that will clobber it: */ + preempt_disable_ip = get_preempt_disable_ip(current); + + printk(KERN_ERR + "BUG: sleeping function called from invalid context at %s:%d\n", + file, line); + printk(KERN_ERR + "in_atomic(): %d, irqs_disabled(): %d, pid: %d, name: %s\n", + in_atomic(), irqs_disabled(), + current->pid, current->comm); + + if (task_stack_end_corrupted(current)) + printk(KERN_EMERG "Thread overran stack, or stack corrupted\n"); + + debug_show_held_locks(current); + if (irqs_disabled()) + print_irqtrace_events(current); + if (IS_ENABLED(CONFIG_DEBUG_PREEMPT) + && !preempt_count_equals(preempt_offset)) { + pr_err("Preemption disabled at:"); + print_ip_sym(preempt_disable_ip); + pr_cont("\n"); + } + dump_stack(); + add_taint(TAINT_WARN, LOCKDEP_STILL_OK); +} +EXPORT_SYMBOL(___might_sleep); +#endif + +#ifdef CONFIG_MAGIC_SYSRQ +static inline void normalise_rt_tasks(void) +{ + struct task_struct *g, *p; + unsigned long flags; + struct rq *rq; + + read_lock(&tasklist_lock); + for_each_process_thread(g, p) { + /* + * Only normalize user tasks: + */ + if (p->flags & PF_KTHREAD) + continue; + + if (!rt_task(p) && !iso_task(p)) + continue; + + rq = task_rq_lock(p, &flags); + __setscheduler(p, rq, SCHED_NORMAL, 0, false); + task_rq_unlock(rq, p, &flags); + } + read_unlock(&tasklist_lock); +} + +void normalize_rt_tasks(void) +{ + normalise_rt_tasks(); +} +#endif /* CONFIG_MAGIC_SYSRQ */ + +#if defined(CONFIG_IA64) || defined(CONFIG_KGDB_KDB) +/* + * These functions are only useful for the IA64 MCA handling, or kdb. + * + * They can only be called when the whole system has been + * stopped - every CPU needs to be quiescent, and no scheduling + * activity can take place. Using them for anything else would + * be a serious bug, and as a result, they aren't even visible + * under any other configuration. + */ + +/** + * curr_task - return the current task for a given CPU. + * @cpu: the processor in question. + * + * ONLY VALID WHEN THE WHOLE SYSTEM IS STOPPED! + * + * Return: The current task for @cpu. + */ +struct task_struct *curr_task(int cpu) +{ + return cpu_curr(cpu); +} + +#endif /* defined(CONFIG_IA64) || defined(CONFIG_KGDB_KDB) */ + +#ifdef CONFIG_IA64 +/** + * set_curr_task - set the current task for a given CPU. + * @cpu: the processor in question. + * @p: the task pointer to set. + * + * Description: This function must only be used when non-maskable interrupts + * are serviced on a separate stack. It allows the architecture to switch the + * notion of the current task on a CPU in a non-blocking manner. This function + * must be called with all CPU's synchronised, and interrupts disabled, the + * and caller must save the original value of the current task (see + * curr_task() above) and restore that value before reenabling interrupts and + * re-starting the system. + * + * ONLY VALID WHEN THE WHOLE SYSTEM IS STOPPED! + */ +void ia64_set_curr_task(int cpu, struct task_struct *p) +{ + cpu_curr(cpu) = p; +} + +#endif + +void init_idle_bootup_task(struct task_struct *idle) +{} + +#ifdef CONFIG_SCHED_DEBUG +void proc_sched_show_task(struct task_struct *p, struct seq_file *m) +{} + +void proc_sched_set_task(struct task_struct *p) +{} +#endif + +#ifdef CONFIG_SMP +#define SCHED_LOAD_SHIFT (10) +#define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) + +unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu) +{ + return SCHED_LOAD_SCALE; +} + +unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu) +{ + unsigned long weight = cpumask_weight(sched_domain_span(sd)); + unsigned long smt_gain = sd->smt_gain; + + smt_gain /= weight; + + return smt_gain; +} +#endif + +#ifdef CONFIG_CGROUP_SCHED +static void sched_free_group(struct task_group *tg) +{ + kmem_cache_free(task_group_cache, tg); +} + +/* allocate runqueue etc for a new task group */ +struct task_group *sched_create_group(struct task_group *parent) +{ + struct task_group *tg; + + tg = kmem_cache_alloc(task_group_cache, GFP_KERNEL | __GFP_ZERO); + if (!tg) + return ERR_PTR(-ENOMEM); + + return tg; +} + +void sched_online_group(struct task_group *tg, struct task_group *parent) +{ +} + +/* rcu callback to free various structures associated with a task group */ +static void sched_free_group_rcu(struct rcu_head *rhp) +{ + /* Now it should be safe to free those cfs_rqs */ + sched_free_group(container_of(rhp, struct task_group, rcu)); +} + +void sched_destroy_group(struct task_group *tg) +{ + /* Wait for possible concurrent references to cfs_rqs complete */ + call_rcu(&tg->rcu, sched_free_group_rcu); +} + +void sched_offline_group(struct task_group *tg) +{ +} + +static inline struct task_group *css_tg(struct cgroup_subsys_state *css) +{ + return css ? container_of(css, struct task_group, css) : NULL; +} + +static struct cgroup_subsys_state * +cpu_cgroup_css_alloc(struct cgroup_subsys_state *parent_css) +{ + struct task_group *parent = css_tg(parent_css); + struct task_group *tg; + + if (!parent) { + /* This is early initialization for the top cgroup */ + return &root_task_group.css; + } + + tg = sched_create_group(parent); + if (IS_ERR(tg)) + return ERR_PTR(-ENOMEM); + return &tg->css; +} + +/* Expose task group only after completing cgroup initialization */ +static int cpu_cgroup_css_online(struct cgroup_subsys_state *css) +{ + struct task_group *tg = css_tg(css); + struct task_group *parent = css_tg(css->parent); + + if (parent) + sched_online_group(tg, parent); + return 0; +} + +static void cpu_cgroup_css_released(struct cgroup_subsys_state *css) +{ + struct task_group *tg = css_tg(css); + + sched_offline_group(tg); +} + +static void cpu_cgroup_css_free(struct cgroup_subsys_state *css) +{ + struct task_group *tg = css_tg(css); + + /* + * Relies on the RCU grace period between css_released() and this. + */ + sched_free_group(tg); +} + +static void cpu_cgroup_fork(struct task_struct *task) +{ +} + +static int cpu_cgroup_can_attach(struct cgroup_taskset *tset) +{ + return 0; +} + +static void cpu_cgroup_attach(struct cgroup_taskset *tset) +{ +} + +static struct cftype cpu_files[] = { + { } /* Terminate */ +}; + +struct cgroup_subsys cpu_cgrp_subsys = { + .css_alloc = cpu_cgroup_css_alloc, + .css_online = cpu_cgroup_css_online, + .css_released = cpu_cgroup_css_released, + .css_free = cpu_cgroup_css_free, + .fork = cpu_cgroup_fork, + .can_attach = cpu_cgroup_can_attach, + .attach = cpu_cgroup_attach, + .legacy_cftypes = cpu_files, + .early_init = true, +}; +#endif /* CONFIG_CGROUP_SCHED */ diff --git a/kernel/sched/MuQSS.h b/kernel/sched/MuQSS.h new file mode 100644 index 0000000000000000..0bee8d7aac35a404 --- /dev/null +++ b/kernel/sched/MuQSS.h @@ -0,0 +1,701 @@ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#ifdef CONFIG_PARAVIRT +#include +#endif + +#include "cpuacct.h" + +#ifndef MUQSS_SCHED_H +#define MUQSS_SCHED_H + +#ifdef CONFIG_SCHED_DEBUG +# define SCHED_WARN_ON(x) WARN_ONCE(x, #x) +#else +# define SCHED_WARN_ON(x) ((void)(x)) +#endif + +/* task_struct::on_rq states: */ +#define TASK_ON_RQ_QUEUED 1 +#define TASK_ON_RQ_MIGRATING 2 + +struct rq; + +#ifdef CONFIG_SMP + +static inline bool sched_asym_prefer(int a, int b) +{ + return arch_asym_cpu_priority(a) > arch_asym_cpu_priority(b); +} + +/* + * We add the notion of a root-domain which will be used to define per-domain + * variables. Each exclusive cpuset essentially defines an island domain by + * fully partitioning the member cpus from any other cpuset. Whenever a new + * exclusive cpuset is created, we also create and attach a new root-domain + * object. + * + */ +struct root_domain { + atomic_t refcount; + atomic_t rto_count; + struct rcu_head rcu; + cpumask_var_t span; + cpumask_var_t online; + + /* Indicate more than one runnable task for any CPU */ + bool overload; + + /* + * The bit corresponding to a CPU gets set here if such CPU has more + * than one runnable -deadline task (as it is below for RT tasks). + */ + cpumask_var_t dlo_mask; + atomic_t dlo_count; + /* Replace unused CFS structures with void */ + //struct dl_bw dl_bw; + //struct cpudl cpudl; + void *dl_bw; + void *cpudl; + + /* + * The "RT overload" flag: it gets set if a CPU has more than + * one runnable RT task. + */ + cpumask_var_t rto_mask; + //struct cpupri cpupri; + void *cpupri; + + unsigned long max_cpu_capacity; +}; + +extern struct root_domain def_root_domain; +extern struct mutex sched_domains_mutex; + +extern void init_defrootdomain(void); +extern int sched_init_domains(const struct cpumask *cpu_map); +extern void rq_attach_root(struct rq *rq, struct root_domain *rd); + +static inline void cpupri_cleanup(void __maybe_unused *cpupri) +{ +} + +static inline void cpudl_cleanup(void __maybe_unused *cpudl) +{ +} + +static inline void init_dl_bw(void __maybe_unused *dl_bw) +{ +} + +static inline int cpudl_init(void __maybe_unused *dl_bw) +{ + return 0; +} + +static inline int cpupri_init(void __maybe_unused *cpupri) +{ + return 0; +} +#endif /* CONFIG_SMP */ + +/* + * This is the main, per-CPU runqueue data structure. + * This data should only be modified by the local cpu. + */ +struct rq { + raw_spinlock_t lock; + + struct task_struct *curr, *idle, *stop; + struct mm_struct *prev_mm; + + unsigned int nr_running; + /* + * This is part of a global counter where only the total sum + * over all CPUs matters. A task can increase this counter on + * one CPU and if it got migrated afterwards it may decrease + * it on another CPU. Always updated under the runqueue lock: + */ + unsigned long nr_uninterruptible; + u64 nr_switches; + + /* Stored data about rq->curr to work outside rq lock */ + u64 rq_deadline; + int rq_prio; + + /* Best queued id for use outside lock */ + u64 best_key; + + unsigned long last_scheduler_tick; /* Last jiffy this RQ ticked */ + unsigned long last_jiffy; /* Last jiffy this RQ updated rq clock */ + u64 niffies; /* Last time this RQ updated rq clock */ + u64 last_niffy; /* Last niffies as updated by local clock */ + u64 last_jiffy_niffies; /* Niffies @ last_jiffy */ + + u64 load_update; /* When we last updated load */ + unsigned long load_avg; /* Rolling load average */ +#ifdef CONFIG_SMT_NICE + struct mm_struct *rq_mm; + int rq_smt_bias; /* Policy/nice level bias across smt siblings */ +#endif + /* Accurate timekeeping data */ + unsigned long user_ns, nice_ns, irq_ns, softirq_ns, system_ns, + iowait_ns, idle_ns; + atomic_t nr_iowait; + + skiplist_node node; + skiplist *sl; +#ifdef CONFIG_SMP + struct task_struct *preempt; /* Preempt triggered on this task */ + struct task_struct *preempting; /* Hint only, what task is preempting */ + + int cpu; /* cpu of this runqueue */ + bool online; + + struct root_domain *rd; + struct sched_domain *sd; + + unsigned long cpu_capacity_orig; + + int *cpu_locality; /* CPU relative cache distance */ + struct rq **rq_order; /* RQs ordered by relative cache distance */ + +#ifdef CONFIG_SCHED_SMT + cpumask_t thread_mask; + bool (*siblings_idle)(struct rq *rq); + /* See if all smt siblings are idle */ +#endif /* CONFIG_SCHED_SMT */ +#ifdef CONFIG_SCHED_MC + cpumask_t core_mask; + bool (*cache_idle)(struct rq *rq); + /* See if all cache siblings are idle */ +#endif /* CONFIG_SCHED_MC */ +#endif /* CONFIG_SMP */ +#ifdef CONFIG_IRQ_TIME_ACCOUNTING + u64 prev_irq_time; +#endif /* CONFIG_IRQ_TIME_ACCOUNTING */ +#ifdef CONFIG_PARAVIRT + u64 prev_steal_time; +#endif /* CONFIG_PARAVIRT */ +#ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING + u64 prev_steal_time_rq; +#endif /* CONFIG_PARAVIRT_TIME_ACCOUNTING */ + + u64 clock, old_clock, last_tick; + u64 clock_task; + int dither; + + int iso_ticks; + bool iso_refractory; + +#ifdef CONFIG_HIGH_RES_TIMERS + struct hrtimer hrexpiry_timer; +#endif + +#ifdef CONFIG_SCHEDSTATS + + /* latency stats */ + struct sched_info rq_sched_info; + unsigned long long rq_cpu_time; + /* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */ + + /* sys_sched_yield() stats */ + unsigned int yld_count; + + /* schedule() stats */ + unsigned int sched_switch; + unsigned int sched_count; + unsigned int sched_goidle; + + /* try_to_wake_up() stats */ + unsigned int ttwu_count; + unsigned int ttwu_local; +#endif /* CONFIG_SCHEDSTATS */ + +#ifdef CONFIG_SMP + struct llist_head wake_list; +#endif + +#ifdef CONFIG_CPU_IDLE + /* Must be inspected within a rcu lock section */ + struct cpuidle_state *idle_state; +#endif +}; + +#ifdef CONFIG_SMP +struct rq *cpu_rq(int cpu); +#endif + +#ifndef CONFIG_SMP +extern struct rq *uprq; +#define cpu_rq(cpu) (uprq) +#define this_rq() (uprq) +#define raw_rq() (uprq) +#define task_rq(p) (uprq) +#define cpu_curr(cpu) ((uprq)->curr) +#else /* CONFIG_SMP */ +DECLARE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues); +#define this_rq() this_cpu_ptr(&runqueues) +#define raw_rq() raw_cpu_ptr(&runqueues) +#define task_rq(p) cpu_rq(task_cpu(p)) +#endif /* CONFIG_SMP */ + +static inline int task_current(struct rq *rq, struct task_struct *p) +{ + return rq->curr == p; +} + +static inline int task_running(struct rq *rq, struct task_struct *p) +{ +#ifdef CONFIG_SMP + return p->on_cpu; +#else + return task_current(rq, p); +#endif +} + +static inline void rq_lock(struct rq *rq) + __acquires(rq->lock) +{ + raw_spin_lock(&rq->lock); +} + +static inline void rq_unlock(struct rq *rq) + __releases(rq->lock) +{ + raw_spin_unlock(&rq->lock); +} + +static inline void rq_lock_irq(struct rq *rq) + __acquires(rq->lock) +{ + raw_spin_lock_irq(&rq->lock); +} + +static inline void rq_unlock_irq(struct rq *rq) + __releases(rq->lock) +{ + raw_spin_unlock_irq(&rq->lock); +} + +static inline void rq_lock_irqsave(struct rq *rq, unsigned long *flags) + __acquires(rq->lock) +{ + raw_spin_lock_irqsave(&rq->lock, *flags); +} + +static inline void rq_unlock_irqrestore(struct rq *rq, unsigned long *flags) + __releases(rq->lock) +{ + raw_spin_unlock_irqrestore(&rq->lock, *flags); +} + +static inline struct rq *task_rq_lock(struct task_struct *p, unsigned long *flags) + __acquires(p->pi_lock) + __acquires(rq->lock) +{ + struct rq *rq; + + while (42) { + raw_spin_lock_irqsave(&p->pi_lock, *flags); + rq = task_rq(p); + raw_spin_lock(&rq->lock); + if (likely(rq == task_rq(p))) + break; + raw_spin_unlock(&rq->lock); + raw_spin_unlock_irqrestore(&p->pi_lock, *flags); + } + return rq; +} + +static inline void task_rq_unlock(struct rq *rq, struct task_struct *p, unsigned long *flags) + __releases(rq->lock) + __releases(p->pi_lock) +{ + rq_unlock(rq); + raw_spin_unlock_irqrestore(&p->pi_lock, *flags); +} + +static inline struct rq *__task_rq_lock(struct task_struct *p) + __acquires(rq->lock) +{ + struct rq *rq; + + lockdep_assert_held(&p->pi_lock); + + while (42) { + rq = task_rq(p); + raw_spin_lock(&rq->lock); + if (likely(rq == task_rq(p))) + break; + raw_spin_unlock(&rq->lock); + } + return rq; +} + +static inline void __task_rq_unlock(struct rq *rq) +{ + rq_unlock(rq); +} + +/* + * {de,en}queue flags: Most not used on MuQSS. + * + * DEQUEUE_SLEEP - task is no longer runnable + * ENQUEUE_WAKEUP - task just became runnable + * + * SAVE/RESTORE - an otherwise spurious dequeue/enqueue, done to ensure tasks + * are in a known state which allows modification. Such pairs + * should preserve as much state as possible. + * + * MOVE - paired with SAVE/RESTORE, explicitly does not preserve the location + * in the runqueue. + * + * ENQUEUE_HEAD - place at front of runqueue (tail if not specified) + * ENQUEUE_REPLENISH - CBS (replenish runtime and postpone deadline) + * ENQUEUE_MIGRATED - the task was migrated during wakeup + * + */ + +#define DEQUEUE_SAVE 0x02 /* matches ENQUEUE_RESTORE */ + +#define ENQUEUE_RESTORE 0x02 + +static inline u64 __rq_clock_broken(struct rq *rq) +{ + return READ_ONCE(rq->clock); +} + +static inline u64 rq_clock(struct rq *rq) +{ + lockdep_assert_held(&rq->lock); + + return rq->clock; +} + +static inline u64 rq_clock_task(struct rq *rq) +{ + lockdep_assert_held(&rq->lock); + + return rq->clock_task; +} + +#ifdef CONFIG_NUMA +enum numa_topology_type { + NUMA_DIRECT, + NUMA_GLUELESS_MESH, + NUMA_BACKPLANE, +}; +extern enum numa_topology_type sched_numa_topology_type; +extern int sched_max_numa_distance; +extern bool find_numa_distance(int distance); + +extern void sched_init_numa(void); +extern void sched_domains_numa_masks_set(unsigned int cpu); +extern void sched_domains_numa_masks_clear(unsigned int cpu); +#else +static inline void sched_init_numa(void) { } +static inline void sched_domains_numa_masks_set(unsigned int cpu) { } +static inline void sched_domains_numa_masks_clear(unsigned int cpu) { } +#endif + +extern struct mutex sched_domains_mutex; +extern struct static_key_false sched_schedstats; + +#define rcu_dereference_check_sched_domain(p) \ + rcu_dereference_check((p), \ + lockdep_is_held(&sched_domains_mutex)) + +#ifdef CONFIG_SMP + +/* + * The domain tree (rq->sd) is protected by RCU's quiescent state transition. + * See detach_destroy_domains: synchronize_sched for details. + * + * The domain tree of any CPU may only be accessed from within + * preempt-disabled sections. + */ +#define for_each_domain(cpu, __sd) \ + for (__sd = rcu_dereference_check_sched_domain(cpu_rq(cpu)->sd); \ + __sd; __sd = __sd->parent) + +#define for_each_lower_domain(sd) for (; sd; sd = sd->child) + +/** + * highest_flag_domain - Return highest sched_domain containing flag. + * @cpu: The cpu whose highest level of sched domain is to + * be returned. + * @flag: The flag to check for the highest sched_domain + * for the given cpu. + * + * Returns the highest sched_domain of a cpu which contains the given flag. + */ +static inline struct sched_domain *highest_flag_domain(int cpu, int flag) +{ + struct sched_domain *sd, *hsd = NULL; + + for_each_domain(cpu, sd) { + if (!(sd->flags & flag)) + break; + hsd = sd; + } + + return hsd; +} + +static inline struct sched_domain *lowest_flag_domain(int cpu, int flag) +{ + struct sched_domain *sd; + + for_each_domain(cpu, sd) { + if (sd->flags & flag) + break; + } + + return sd; +} + +DECLARE_PER_CPU(struct sched_domain *, sd_llc); +DECLARE_PER_CPU(int, sd_llc_size); +DECLARE_PER_CPU(int, sd_llc_id); +DECLARE_PER_CPU(struct sched_domain_shared *, sd_llc_shared); +DECLARE_PER_CPU(struct sched_domain *, sd_numa); +DECLARE_PER_CPU(struct sched_domain *, sd_asym); + +struct sched_group_capacity { + atomic_t ref; + /* + * CPU capacity of this group, SCHED_CAPACITY_SCALE being max capacity + * for a single CPU. + */ + unsigned long capacity; + unsigned long min_capacity; /* Min per-CPU capacity in group */ + unsigned long next_update; + int imbalance; /* XXX unrelated to capacity but shared group state */ + +#ifdef CONFIG_SCHED_DEBUG + int id; +#endif + + unsigned long cpumask[0]; /* balance mask */ +}; + +struct sched_group { + struct sched_group *next; /* Must be a circular list */ + atomic_t ref; + + unsigned int group_weight; + struct sched_group_capacity *sgc; + int asym_prefer_cpu; /* cpu of highest priority in group */ + + /* + * The CPUs this group covers. + * + * NOTE: this field is variable length. (Allocated dynamically + * by attaching extra space to the end of the structure, + * depending on how many CPUs the kernel has booted up with) + */ + unsigned long cpumask[0]; +}; + +static inline struct cpumask *sched_group_span(struct sched_group *sg) +{ + return to_cpumask(sg->cpumask); +} + +/* + * See build_balance_mask(). + */ +static inline struct cpumask *group_balance_mask(struct sched_group *sg) +{ + return to_cpumask(sg->sgc->cpumask); +} + +/** + * group_first_cpu - Returns the first cpu in the cpumask of a sched_group. + * @group: The group whose first cpu is to be returned. + */ +static inline unsigned int group_first_cpu(struct sched_group *group) +{ + return cpumask_first(sched_group_span(group)); +} + + +#if defined(CONFIG_SCHED_DEBUG) && defined(CONFIG_SYSCTL) +void register_sched_domain_sysctl(void); +void unregister_sched_domain_sysctl(void); +#else +static inline void register_sched_domain_sysctl(void) +{ +} +static inline void unregister_sched_domain_sysctl(void) +{ +} +#endif + +extern void sched_ttwu_pending(void); +extern void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_mask); +extern void set_rq_online (struct rq *rq); +extern void set_rq_offline(struct rq *rq); +extern bool sched_smp_initialized; + +static inline void update_group_capacity(struct sched_domain *sd, int cpu) +{ +} + +static inline void trigger_load_balance(struct rq *rq) +{ +} + +#define sched_feat(x) 0 + +#else /* CONFIG_SMP */ + +static inline void sched_ttwu_pending(void) { } + +#endif /* CONFIG_SMP */ + +#ifdef CONFIG_CPU_IDLE +static inline void idle_set_state(struct rq *rq, + struct cpuidle_state *idle_state) +{ + rq->idle_state = idle_state; +} + +static inline struct cpuidle_state *idle_get_state(struct rq *rq) +{ + SCHED_WARN_ON(!rcu_read_lock_held()); + return rq->idle_state; +} +#else +static inline void idle_set_state(struct rq *rq, + struct cpuidle_state *idle_state) +{ +} + +static inline struct cpuidle_state *idle_get_state(struct rq *rq) +{ + return NULL; +} +#endif + +extern void schedule_idle(void); + +#ifdef CONFIG_IRQ_TIME_ACCOUNTING +struct irqtime { + u64 total; + u64 tick_delta; + u64 irq_start_time; + struct u64_stats_sync sync; +}; + +DECLARE_PER_CPU(struct irqtime, cpu_irqtime); + +/* + * Returns the irqtime minus the softirq time computed by ksoftirqd. + * Otherwise ksoftirqd's sum_exec_runtime is substracted its own runtime + * and never move forward. + */ +static inline u64 irq_time_read(int cpu) +{ + struct irqtime *irqtime = &per_cpu(cpu_irqtime, cpu); + unsigned int seq; + u64 total; + + do { + seq = __u64_stats_fetch_begin(&irqtime->sync); + total = irqtime->total; + } while (__u64_stats_fetch_retry(&irqtime->sync, seq)); + + return total; +} +#endif /* CONFIG_IRQ_TIME_ACCOUNTING */ + +#ifdef CONFIG_CPU_FREQ +DECLARE_PER_CPU(struct update_util_data *, cpufreq_update_util_data); + +static inline void cpufreq_trigger(u64 time, unsigned int flags) +{ + struct update_util_data *data = rcu_dereference_sched(*this_cpu_ptr(&cpufreq_update_util_data)); + + if (data) + data->func(data, time, flags); +} +#else +static inline void cpufreq_trigger(u64 time, unsigned int flag) +{ +} +#endif /* CONFIG_CPU_FREQ */ + +#ifdef arch_scale_freq_capacity +#ifndef arch_scale_freq_invariant +#define arch_scale_freq_invariant() (true) +#endif +#else /* arch_scale_freq_capacity */ +#define arch_scale_freq_invariant() (false) +#endif + +/* + * This should only be called when current == rq->idle. Dodgy workaround for + * when softirqs are pending and we are in the idle loop. Setting current to + * resched will kick us out of the idle loop and the softirqs will be serviced + * on our next pass through schedule(). + */ +static inline bool softirq_pending(int cpu) +{ + if (likely(!local_softirq_pending())) + return false; + set_tsk_need_resched(current); + return true; +} + +#ifdef CONFIG_64BIT +static inline u64 read_sum_exec_runtime(struct task_struct *t) +{ + return tsk_seruntime(t); +} +#else +struct rq *task_rq_lock(struct task_struct *p, unsigned long *flags); +void task_rq_unlock(struct rq *rq, struct task_struct *p, unsigned long *flags); + +static inline u64 read_sum_exec_runtime(struct task_struct *t) +{ + unsigned long flags; + u64 ns; + struct rq *rq; + + rq = task_rq_lock(t, &flags); + ns = tsk_seruntime(t); + task_rq_unlock(rq, t, &flags); + + return ns; +} +#endif + +#endif /* MUQSS_SCHED_H */ diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c index 29a397067ffa0f7c..4dd1de8ea21154a9 100644 --- a/kernel/sched/cpufreq_schedutil.c +++ b/kernel/sched/cpufreq_schedutil.c @@ -154,16 +154,28 @@ static unsigned int get_next_freq(struct sugov_policy *sg_policy, return cpufreq_driver_resolve_freq(policy, freq); } +#ifdef CONFIG_SCHED_MUQSS +static void sugov_get_util(unsigned long *util, unsigned long *max) +{ + struct rq *rq = this_rq(); + + *util = rq->load_avg; + if (*util > SCHED_CAPACITY_SCALE) + *util = SCHED_CAPACITY_SCALE; + *max = SCHED_CAPACITY_SCALE; +} +#else /* CONFIG_SCHED_MUQSS */ static void sugov_get_util(unsigned long *util, unsigned long *max) { struct rq *rq = this_rq(); unsigned long cfs_max; cfs_max = arch_scale_cpu_capacity(NULL, smp_processor_id()); *util = min(rq->cfs.avg.util_avg, cfs_max); *max = cfs_max; } +#endif /* CONFIG_SCHED_MUQSS */ static void sugov_set_iowait_boost(struct sugov_cpu *sg_cpu, u64 time, unsigned int flags) diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c index 14d2dbf97c531db0..9217632f44c706aa 100644 --- a/kernel/sched/cputime.c +++ b/kernel/sched/cputime.c @@ -270,26 +270,6 @@ static inline u64 account_other_time(u64 max) return accounted; } -#ifdef CONFIG_64BIT -static inline u64 read_sum_exec_runtime(struct task_struct *t) -{ - return t->se.sum_exec_runtime; -} -#else -static u64 read_sum_exec_runtime(struct task_struct *t) -{ - u64 ns; - struct rq_flags rf; - struct rq *rq; - - rq = task_rq_lock(t, &rf); - ns = t->se.sum_exec_runtime; - task_rq_unlock(rq, t, &rf); - - return ns; -} -#endif - /* * Accumulate raw cputime values of dead tasks (sig->[us]time) and live * tasks (sum on group iteration) belonging to @tsk's group. @@ -661,7 +641,7 @@ static void cputime_adjust(struct task_cputime *curr, void task_cputime_adjusted(struct task_struct *p, u64 *ut, u64 *st) { struct task_cputime cputime = { - .sum_exec_runtime = p->se.sum_exec_runtime, + .sum_exec_runtime = tsk_seruntime(p), }; task_cputime(p, &cputime.utime, &cputime.stime); diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index c95880e216f6900e..1b43c00f4503b97c 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -50,78 +50,103 @@ * * (default: 6ms * (1 + ilog(ncpus)), units: nanoseconds) */ +#ifdef CONFIG_PCK_INTERACTIVE +unsigned int sysctl_sched_latency = 3000000ULL; +unsigned int normalized_sysctl_sched_latency = 3000000ULL; +#else unsigned int sysctl_sched_latency = 6000000ULL; unsigned int normalized_sysctl_sched_latency = 6000000ULL; +#endif /* * The initial- and re-scaling of tunables is configurable * * Options are: * * SCHED_TUNABLESCALING_NONE - unscaled, always *1 * SCHED_TUNABLESCALING_LOG - scaled logarithmical, *1+ilog(ncpus) * SCHED_TUNABLESCALING_LINEAR - scaled linear, *ncpus * * (default SCHED_TUNABLESCALING_LOG = *(1+ilog(ncpus)) */ enum sched_tunable_scaling sysctl_sched_tunable_scaling = SCHED_TUNABLESCALING_LOG; /* * Minimal preemption granularity for CPU-bound tasks: * * (default: 0.75 msec * (1 + ilog(ncpus)), units: nanoseconds) */ +#ifdef CONFIG_PCK_INTERACTIVE +unsigned int sysctl_sched_min_granularity = 300000ULL; +unsigned int normalized_sysctl_sched_min_granularity = 300000ULL; +#else unsigned int sysctl_sched_min_granularity = 750000ULL; unsigned int normalized_sysctl_sched_min_granularity = 750000ULL; +#endif /* * This value is kept at sysctl_sched_latency/sysctl_sched_min_granularity */ +#ifdef CONFIG_PCK_INTERACTIVE +static unsigned int sched_nr_latency = 10; +#else static unsigned int sched_nr_latency = 8; +#endif /* * After fork, child runs first. If set to 0 (default) then * parent will (try to) run first. */ unsigned int sysctl_sched_child_runs_first __read_mostly; /* * SCHED_OTHER wake-up granularity. * * This option delays the preemption effects of decoupled workloads * and reduces their over-scheduling. Synchronous workloads will still * have immediate wakeup/sleep latencies. * * (default: 1 msec * (1 + ilog(ncpus)), units: nanoseconds) */ +#ifdef CONFIG_PCK_INTERACTIVE +unsigned int sysctl_sched_wakeup_granularity = 500000UL; +unsigned int normalized_sysctl_sched_wakeup_granularity = 500000UL; + +const_debug unsigned int sysctl_sched_migration_cost = 250000UL; +#else unsigned int sysctl_sched_wakeup_granularity = 1000000UL; unsigned int normalized_sysctl_sched_wakeup_granularity = 1000000UL; const_debug unsigned int sysctl_sched_migration_cost = 500000UL; +#endif #ifdef CONFIG_SMP /* * For asym packing, by default the lower numbered cpu has higher priority. */ int __weak arch_asym_cpu_priority(int cpu) { return -cpu; } #endif #ifdef CONFIG_CFS_BANDWIDTH /* * Amount of runtime to allocate from global (tg) to local (per-cfs_rq) pool * each time a cfs_rq requests quota. * * Note: in the case that the slice exceeds the runtime remaining (either due * to consumption or the quota being specified to be smaller than the slice) * we will always only issue the remaining available time. * * (default: 5 msec, units: microseconds) */ +#ifdef CONFIG_PCK_INTERACTIVE +unsigned int sysctl_sched_cfs_bandwidth_slice = 3000UL; +#else unsigned int sysctl_sched_cfs_bandwidth_slice = 5000UL; #endif +#endif /* * The margin used when comparing utilization with CPU capacity: diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c index 6c23e30c0e5cc5ad..ada98f2d403624f8 100644 --- a/kernel/sched/idle.c +++ b/kernel/sched/idle.c @@ -209,24 +209,30 @@ static void cpuidle_idle_call(void) */ static void do_idle(void) { + int cpu = smp_processor_id(); + bool pending = false; + /* * If the arch has a polling bit, we maintain an invariant: * * Our polling bit is clear if we're not scheduled (i.e. if rq->curr != * rq->idle). This means that, if rq->idle has the polling bit set, * then setting need_resched is guaranteed to cause the CPU to * reschedule. */ __current_set_polling(); quiet_vmstat(); - tick_nohz_idle_enter(); + if (unlikely(softirq_pending(cpu))) + pending = true; + else + tick_nohz_idle_enter(); while (!need_resched()) { check_pgt_cache(); rmb(); - if (cpu_is_offline(smp_processor_id())) { + if (cpu_is_offline(cpu)) { cpuhp_report_idle_dead(); arch_cpu_idle_dead(); } @@ -255,7 +261,8 @@ static void do_idle(void) * an IPI to fold the state for us. */ preempt_set_need_resched(); - tick_nohz_idle_exit(); + if (!pending) + tick_nohz_idle_exit(); __current_clr_polling(); /* diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index eeef1a3086d1e74a..c896b638b0bba12c 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -1,4 +1,6 @@ - +#ifdef CONFIG_SCHED_MUQSS +#include "MuQSS.h" +#else /* CONFIG_SCHED_MUQSS */ #include #include #include @@ -2092,3 +2094,29 @@ static inline void cpufreq_update_this_cpu(struct rq *rq, unsigned int flags) {} #else /* arch_scale_freq_capacity */ #define arch_scale_freq_invariant() (false) #endif + +static inline bool softirq_pending(int cpu) +{ + return false; +} + +#ifdef CONFIG_64BIT +static inline u64 read_sum_exec_runtime(struct task_struct *t) +{ + return t->se.sum_exec_runtime; +} +#else +static inline u64 read_sum_exec_runtime(struct task_struct *t) +{ + u64 ns; + struct rq_flags rf; + struct rq *rq; + + rq = task_rq_lock(t, &rf); + ns = t->se.sum_exec_runtime; + task_rq_unlock(rq, t, &rf); + + return ns; +} +#endif +#endif /* CONFIG_SCHED_MUQSS */ diff --git a/kernel/skip_list.c b/kernel/skip_list.c new file mode 100644 index 0000000000000000..bf5c6e97e1396a74 --- /dev/null +++ b/kernel/skip_list.c @@ -0,0 +1,148 @@ +/* + Copyright (C) 2011,2016 Con Kolivas. + + Code based on example originally by William Pugh. + +Skip Lists are a probabilistic alternative to balanced trees, as +described in the June 1990 issue of CACM and were invented by +William Pugh in 1987. + +A couple of comments about this implementation: +The routine randomLevel has been hard-coded to generate random +levels using p=0.25. It can be easily changed. + +The insertion routine has been implemented so as to use the +dirty hack described in the CACM paper: if a random level is +generated that is more than the current maximum level, the +current maximum level plus one is used instead. + +Levels start at zero and go up to MaxLevel (which is equal to +MaxNumberOfLevels-1). + +The routines defined in this file are: + +init: defines slnode + +new_skiplist: returns a new, empty list + +randomLevel: Returns a random level based on a u64 random seed passed to it. +In MuQSS, the "niffy" time is used for this purpose. + +insert(l,key, value): inserts the binding (key, value) into l. This operation +occurs in O(log n) time. + +delnode(slnode, l, node): deletes any binding of key from the l based on the +actual node value. This operation occurs in O(k) time where k is the +number of levels of the node in question (max 8). The original delete +function occurred in O(log n) time and involved a search. + +MuQSS Notes: In this implementation of skiplists, there are bidirectional +next/prev pointers and the insert function returns a pointer to the actual +node the value is stored. The key here is chosen by the scheduler so as to +sort tasks according to the priority list requirements and is no longer used +by the scheduler after insertion. The scheduler lookup, however, occurs in +O(1) time because it is always the first item in the level 0 linked list. +Since the task struct stores a copy of the node pointer upon skiplist_insert, +it can also remove it much faster than the original implementation with the +aid of prev<->next pointer manipulation and no searching. + +*/ + +#include +#include + +#define MaxNumberOfLevels 8 +#define MaxLevel (MaxNumberOfLevels - 1) + +void skiplist_init(skiplist_node *slnode) +{ + int i; + + slnode->key = 0xFFFFFFFFFFFFFFFF; + slnode->level = 0; + slnode->value = NULL; + for (i = 0; i < MaxNumberOfLevels; i++) + slnode->next[i] = slnode->prev[i] = slnode; +} + +skiplist *new_skiplist(skiplist_node *slnode) +{ + skiplist *l = kzalloc(sizeof(skiplist), GFP_ATOMIC); + + BUG_ON(!l); + l->header = slnode; + return l; +} + +void free_skiplist(skiplist *l) +{ + skiplist_node *p, *q; + + p = l->header; + do { + q = p->next[0]; + p->next[0]->prev[0] = q->prev[0]; + skiplist_node_init(p); + p = q; + } while (p != l->header); + kfree(l); +} + +void skiplist_node_init(skiplist_node *node) +{ + memset(node, 0, sizeof(skiplist_node)); +} + +static inline unsigned int randomLevel(const long unsigned int randseed) +{ + return find_first_bit(&randseed, MaxLevel) / 2; +} + +void skiplist_insert(skiplist *l, skiplist_node *node, keyType key, valueType value, unsigned int randseed) +{ + skiplist_node *update[MaxNumberOfLevels]; + skiplist_node *p, *q; + int k = l->level; + + p = l->header; + do { + while (q = p->next[k], q->key <= key) + p = q; + update[k] = p; + } while (--k >= 0); + + ++l->entries; + k = randomLevel(randseed); + if (k > l->level) { + k = ++l->level; + update[k] = l->header; + } + + node->level = k; + node->key = key; + node->value = value; + do { + p = update[k]; + node->next[k] = p->next[k]; + p->next[k] = node; + node->prev[k] = p; + node->next[k]->prev[k] = node; + } while (--k >= 0); +} + +void skiplist_delete(skiplist *l, skiplist_node *node) +{ + int k, m = node->level; + + for (k = 0; k <= m; k++) { + node->prev[k]->next[k] = node->next[k]; + node->next[k]->prev[k] = node->prev[k]; + } + skiplist_node_init(node); + if (m == l->level) { + while (l->header->next[m] == l->header && l->header->prev[m] == l->header && m > 0) + m--; + l->level = m; + } + l->entries--; +} diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 423554ad361020b3..5054083756dcc50e 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -126,8 +126,14 @@ static int __maybe_unused one = 1; static int __maybe_unused two = 2; static int __maybe_unused four = 4; static unsigned long one_ul = 1; -static int one_hundred = 100; -static int one_thousand = 1000; +static int __read_mostly one_hundred = 100; +static int __read_mostly one_thousand = 1000; +#ifdef CONFIG_SCHED_MUQSS +extern int rr_interval; +extern int sched_interactive; +extern int sched_iso_cpu; +extern int sched_yield_type; +#endif #ifdef CONFIG_PRINTK static int ten_thousand = 10000; #endif @@ -286,23 +292,24 @@ static struct ctl_table sysctl_base_table[] = { { } }; -#ifdef CONFIG_SCHED_DEBUG +#if defined(CONFIG_SCHED_DEBUG) && !defined(CONFIG_SCHED_MUQSS) static int min_sched_granularity_ns = 100000; /* 100 usecs */ static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ static int min_wakeup_granularity_ns; /* 0 usecs */ static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ #ifdef CONFIG_SMP static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; #endif /* CONFIG_SMP */ #endif /* CONFIG_SCHED_DEBUG */ #ifdef CONFIG_COMPACTION static int min_extfrag_threshold; static int max_extfrag_threshold = 1000; #endif static struct ctl_table kern_table[] = { +#ifndef CONFIG_SCHED_MUQSS { .procname = "sched_child_runs_first", .data = &sysctl_sched_child_runs_first, @@ -465,6 +472,7 @@ static struct ctl_table kern_table[] = { .extra1 = &one, }, #endif +#endif /* !CONFIG_SCHED_MUQSS */ #ifdef CONFIG_PROVE_LOCKING { .procname = "prove_locking", @@ -1027,6 +1035,44 @@ static struct ctl_table kern_table[] = { .proc_handler = proc_dointvec, }, #endif +#ifdef CONFIG_SCHED_MUQSS + { + .procname = "rr_interval", + .data = &rr_interval, + .maxlen = sizeof (int), + .mode = 0644, + .proc_handler = &proc_dointvec_minmax, + .extra1 = &one, + .extra2 = &one_thousand, + }, + { + .procname = "interactive", + .data = &sched_interactive, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec_minmax, + .extra1 = &zero, + .extra2 = &one, + }, + { + .procname = "iso_cpu", + .data = &sched_iso_cpu, + .maxlen = sizeof (int), + .mode = 0644, + .proc_handler = &proc_dointvec_minmax, + .extra1 = &zero, + .extra2 = &one_hundred, + }, + { + .procname = "yield_type", + .data = &sched_yield_type, + .maxlen = sizeof (int), + .mode = 0644, + .proc_handler = &proc_dointvec_minmax, + .extra1 = &zero, + .extra2 = &two, + }, +#endif #if defined(CONFIG_S390) && defined(CONFIG_SMP) { .procname = "spin_retry", diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c index 4237e0744e26bd27..4b83ffaba78c99cc 100644 --- a/kernel/time/clockevents.c +++ b/kernel/time/clockevents.c @@ -198,8 +198,13 @@ int clockevents_tick_resume(struct clock_event_device *dev) #ifdef CONFIG_GENERIC_CLOCKEVENTS_MIN_ADJUST +#ifdef CONFIG_SCHED_MUQSS +/* Limit min_delta to 100us */ +#define MIN_DELTA_LIMIT (NSEC_PER_SEC / 10000) +#else /* Limit min_delta to a jiffie */ #define MIN_DELTA_LIMIT (NSEC_PER_SEC / HZ) +#endif /** * clockevents_increase_min_delta - raise minimum delta of a clock event device diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c index a3bd5dbe0dc40700..8e829df88defd3f8 100644 --- a/kernel/time/posix-cpu-timers.c +++ b/kernel/time/posix-cpu-timers.c @@ -818,30 +818,30 @@ static void check_thread_timers(struct task_struct *tsk, tsk_expires->virt_exp = expires; tsk_expires->sched_exp = check_timers_list(++timers, firing, - tsk->se.sum_exec_runtime); + tsk_seruntime(tsk)); /* * Check for the special case thread timers. */ soft = READ_ONCE(sig->rlim[RLIMIT_RTTIME].rlim_cur); if (soft != RLIM_INFINITY) { unsigned long hard = READ_ONCE(sig->rlim[RLIMIT_RTTIME].rlim_max); if (hard != RLIM_INFINITY && - tsk->rt.timeout > DIV_ROUND_UP(hard, USEC_PER_SEC/HZ)) { + tsk_rttimeout(tsk) > DIV_ROUND_UP(hard, USEC_PER_SEC/HZ)) { /* * At the hard limit, we just die. * No need to calculate anything else now. */ if (print_fatal_signals) { pr_info("CPU Watchdog Timeout (hard): %s[%d]\n", tsk->comm, task_pid_nr(tsk)); } __group_send_sig_info(SIGKILL, SEND_SIG_PRIV, tsk); return; } - if (tsk->rt.timeout > DIV_ROUND_UP(soft, USEC_PER_SEC/HZ)) { + if (tsk_rttimeout(tsk) > DIV_ROUND_UP(soft, USEC_PER_SEC/HZ)) { /* * At the soft limit, send a SIGXCPU every second. */ @@ -1082,7 +1082,7 @@ static inline int fastpath_timer_check(struct task_struct *tsk) struct task_cputime task_sample; task_cputime(tsk, &task_sample.utime, &task_sample.stime); - task_sample.sum_exec_runtime = tsk->se.sum_exec_runtime; + task_sample.sum_exec_runtime = tsk_seruntime(tsk); if (task_cputime_expired(&task_sample, &tsk->cputime_expires)) return 1; } diff --git a/kernel/time/timer.c b/kernel/time/timer.c index f2674a056c268a58..9c18e16059a3ddbd 100644 --- a/kernel/time/timer.c +++ b/kernel/time/timer.c @@ -1436,24 +1436,27 @@ static unsigned long __next_timer_interrupt(struct timer_base *base) * Check, if the next hrtimer event is before the next timer wheel * event: */ -static u64 cmp_next_hrtimer_event(u64 basem, u64 expires) +static u64 cmp_next_hrtimer_event(struct timer_base *base, u64 basem, u64 expires) { u64 nextevt = hrtimer_get_next_event(); /* * If high resolution timers are enabled * hrtimer_get_next_event() returns KTIME_MAX. */ if (expires <= nextevt) return expires; /* * If the next timer is already expired, return the tick base * time so the tick is fired immediately. */ if (nextevt <= basem) return basem; + if (nextevt < expires && nextevt - basem <= TICK_NSEC) + base->is_idle = false; + /* * Round up to the next jiffie. High resolution timers are * off, so the hrtimers are expired in the tick and we need to @@ -1523,7 +1526,7 @@ u64 get_next_timer_interrupt(unsigned long basej, u64 basem) } raw_spin_unlock(&base->lock); - return cmp_next_hrtimer_event(basem, expires); + return cmp_next_hrtimer_event(base, basem, expires); } /** diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c index b17ec642793bc327..0fc412923847d7e4 100644 --- a/kernel/trace/trace_selftest.c +++ b/kernel/trace/trace_selftest.c @@ -1040,10 +1040,15 @@ static int trace_wakeup_test_thread(void *data) { /* Make this a -deadline thread */ static const struct sched_attr attr = { +#ifdef CONFIG_SCHED_MUQSS + /* No deadline on MuQSS, use RR */ + .sched_policy = SCHED_RR, +#else .sched_policy = SCHED_DEADLINE, .sched_runtime = 100000ULL, .sched_deadline = 10000000ULL, .sched_period = 10000000ULL +#endif }; struct wakeup_test_data *x = data; diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index c617b9d1d6cb687c..cc4bc8134d209b68 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -976,7 +976,7 @@ config SCHED_INFO config SCHEDSTATS bool "Collect scheduler statistics" - depends on DEBUG_KERNEL && PROC_FS + depends on DEBUG_KERNEL && PROC_FS && !SCHED_MUQSS select SCHED_INFO help If you say Y here, additional code will be inserted into the @@ -1556,6 +1556,7 @@ config LATENCYTOP depends on DEBUG_KERNEL depends on STACKTRACE_SUPPORT depends on PROC_FS + depends on !SCHED_MUQSS select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM_UNWIND && !ARC select KALLSYMS select KALLSYMS_ALL diff --git a/mm/page-writeback.c b/mm/page-writeback.c index bf050ab025b76a26..fa54c2ad6bbb825e 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -71,24 +71,32 @@ static long ratelimit_pages = 32; /* * Start background writeback (via writeback threads) at this percentage */ +#ifdef CONFIG_PCK_INTERACTIVE +int dirty_background_ratio = 20; +#else int dirty_background_ratio = 10; +#endif /* * dirty_background_bytes starts at 0 (disabled) so that it is a function of * dirty_background_ratio * the amount of dirtyable memory */ unsigned long dirty_background_bytes; /* * free highmem will not be subtracted from the total free memory * for calculating free ratios if vm_highmem_is_dirtyable is true */ int vm_highmem_is_dirtyable; /* * The generator of dirty data starts writeback at this percentage */ +#ifdef CONFIG_PCK_INTERACTIVE +int vm_dirty_ratio = 50; +#else int vm_dirty_ratio = 20; +#endif /* * vm_dirty_bytes starts at 0 (disabled) so that it is a function of diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig index 91a2557942fa8533..80e72479f98defbf 100644 --- a/net/ipv4/Kconfig +++ b/net/ipv4/Kconfig @@ -699,6 +699,9 @@ choice config DEFAULT_VEGAS bool "Vegas" if TCP_CONG_VEGAS=y + config DEFAULT_YEAH + bool "YeAH" if TCP_CONG_YEAH=y + config DEFAULT_VENO bool "Veno" if TCP_CONG_VENO=y @@ -732,6 +735,7 @@ config DEFAULT_TCP_CONG default "htcp" if DEFAULT_HTCP default "hybla" if DEFAULT_HYBLA default "vegas" if DEFAULT_VEGAS + default "yeah" if DEFAULT_YEAH default "westwood" if DEFAULT_WESTWOOD default "veno" if DEFAULT_VENO default "reno" if DEFAULT_RENO diff --git a/scripts/mkcompile_h b/scripts/mkcompile_h index fd8fdb91581dd45c..935223acc2d00ada 100755 --- a/scripts/mkcompile_h +++ b/scripts/mkcompile_h @@ -54,8 +54,8 @@ else fi UTS_VERSION="#$VERSION" -CONFIG_FLAGS="" -if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi +CONFIG_FLAGS="PCK" +if [ -n "$SMP" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS SMP"; fi if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS $TIMESTAMP"