- Apr 13, 2023
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Christoph Hellwig authored
blk_mq_sched_insert_request is the main request insert helper and not directly I/O scheduler related. Move blk_mq_sched_insert_request to blk-mq.c, rename it to blk_mq_insert_request and mark it static. Signed-off-by:
Christoph Hellwig <hch@lst.de> Reviewed-by:
Bart Van Assche <bvanassche@acm.org> Reviewed-by:
Damien Le Moal <dlemoal@kernel.org> Link: https://lore.kernel.org/r/20230413064057.707578-7-hch@lst.de Signed-off-by:
Jens Axboe <axboe@kernel.dk>
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Christoph Hellwig authored
blk_mq_dispatch_plug_list is the only caller of blk_mq_sched_insert_requests, and it makes sense to just fold it there as blk_mq_sched_insert_requests isn't specific to I/O schedulers despite the name. Signed-off-by:
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Christoph Hellwig authored
Move all logic related to the direct insert (including the call to blk_mq_run_hw_queue) into blk_mq_insert_requests to streamline the code flow up a bit, and to allow marking blk_mq_try_issue_list_directly static. Signed-off-by:
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Christoph Hellwig authored
block/blk-mq.h needs various definitions from <linux/blk-mq.h>, include it there instead of relying on the source files to include both. Signed-off-by:
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Christoph Hellwig authored
blk-mq-tag.h is always included by blk-mq.h, and causes recursive inclusion hell with further changes. Just merge it into blk-mq.h instead. Signed-off-by:
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- Feb 06, 2023
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Kemeng Shi authored
Commit 88022d72 ("blk-mq: don't handle failure in .get_budget") remove BLK_STS_RESOURCE return value and we only check if we can get the budget from .get_budget() now. Correct stale comment that ".get_budget() returns BLK_STS_NO_RESOURCE" to ".get_budget() fails to get the budget". Fixes: 88022d72 ("blk-mq: don't handle failure in .get_budget") Signed-off-by:
Kemeng Shi <shikemeng@huaweicloud.com> Reviewed-by:
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Kemeng Shi authored
Commit 97889f9a ("blk-mq: remove synchronize_rcu() from blk_mq_del_queue_tag_set()") remove handle of TAG_SHARED in restart, then shared_hctx_restart counted for how many hardware queues are marked for restart is removed too. Remove the stale comment that we still count hardware queues need restart. Fixes: 97889f9a ("blk-mq: remove synchronize_rcu() from blk_mq_del_queue_tag_set()") Reviewed-by:
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- Nov 01, 2022
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Christoph Hellwig authored
Split an elevator_disable helper from elevator_switch for the case where we want to switch to no scheduler at all. This includes removing the pointless elevator_switch_mq helper and removing the switch to no schedule logic from blk_mq_init_sched. Signed-off-by:
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- Oct 24, 2022
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Jinlong Chen authored
The current reference management logic of io scheduler modules contains refcnt problems. For example, blk_mq_init_sched may fail before or after the calling of e->ops.init_sched. If it fails before the calling, it does nothing to the reference to the io scheduler module. But if it fails after the calling, it releases the reference by calling kobject_put(&eq->kobj). As the callers of blk_mq_init_sched can't know exactly where the failure happens, they can't handle the reference to the io scheduler module properly: releasing the reference on failure results in double-release if blk_mq_init_sched has released it, and not releasing the reference results in ghost reference if blk_mq_init_sched did not release it either. The same problem also exists in io schedulers' init_sched implementations. We can address the problem by adding releasing statements to the error handling procedures of blk_mq_init_sched and init_sched implementations. But that is counterintuitive and requires modifications to existing io schedulers. Instead, We make elevator_alloc get the io scheduler module references that will be released by elevator_release. And then, we match each elevator_get with an elevator_put. Therefore, each reference to an io scheduler module explicitly has its own getter and releaser, and we no longer need to worry about the refcnt problems. The bugs and the patch can be validated with tools here: https://github.com/nickyc975/linux_elv_refcnt_bug.git [hch: split out a few bits into separate patches, use a non-try module_get in elevator_alloc] Signed-off-by:
Jinlong Chen <nickyc975@zju.edu.cn> Signed-off-by:
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- Jun 17, 2022
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Christoph Hellwig authored
Various places like I/O schedulers or the QOS infrastructure try to register debugfs files on demans, which can race with creating and removing the main queue debugfs directory. Use the existing debugfs_mutex to serialize all debugfs operations that rely on q->debugfs_dir or the directories hanging off it. To make the teardown code a little simpler declare all debugfs dentry pointers and not just the main one uncoditionally in blkdev.h. Move debugfs_mutex next to the dentries that it protects and document what it is used for. Signed-off-by:
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- Jun 16, 2022
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Ming Lei authored
q->elevator is referred in blk_mq_has_sqsched() without any protection, no .q_usage_counter is held, no queue srcu and rcu read lock is held, so potential use-after-free may be triggered. Fix the issue by adding one queue flag for checking if the elevator uses single queue style dispatch. Meantime the elevator feature flag of ELEVATOR_F_MQ_AWARE isn't needed any more. Cc: Jan Kara <jack@suse.cz> Signed-off-by:
Ming Lei <ming.lei@redhat.com> Reviewed-by:
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- Mar 18, 2022
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Shin'ichiro Kawasaki authored
When IO requests are made continuously and the target block device handles requests faster than request arrival, the request dispatch loop keeps on repeating to dispatch the arriving requests very long time, more than a minute. Since the loop runs as a workqueue worker task, the very long loop duration triggers workqueue watchdog timeout and BUG [1]. To avoid the very long loop duration, break the loop periodically. When opportunity to dispatch requests still exists, check need_resched(). If need_resched() returns true, the dispatch loop already consumed its time slice, then reschedule the dispatch work and break the loop. With heavy IO load, need_resched() does not return true for 20~30 seconds. To cover such case, check time spent in the dispatch loop with jiffies. If more than 1 second is spent, reschedule the dispatch work and break the loop. [1] [ 609.691437] BUG: workqueue lockup - pool cpus=10 node=1 flags=0x0 nice=-20 stuck for 35s! [ 609.701820] Showing busy workqueues and worker pools: [ 609.707915] workqueue events: flags=0x0 [ 609.712615] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 [ 609.712626] pending: drm_fb_helper_damage_work [drm_kms_helper] [ 609.712687] workqueue events_freezable: flags=0x4 [ 609.732943] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 [ 609.732952] pending: pci_pme_list_scan [ 609.732968] workqueue events_power_efficient: flags=0x80 [ 609.751947] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 [ 609.751955] pending: neigh_managed_work [ 609.752018] workqueue kblockd: flags=0x18 [ 609.769480] pwq 21: cpus=10 node=1 flags=0x0 nice=-20 active=3/256 refcnt=4 [ 609.769488] in-flight: 1020:blk_mq_run_work_fn [ 609.769498] pending: blk_mq_timeout_work, blk_mq_run_work_fn [ 609.769744] pool 21: cpus=10 node=1 flags=0x0 nice=-20 hung=35s workers=2 idle: 67 [ 639.899730] BUG: workqueue lockup - pool cpus=10 node=1 flags=0x0 nice=-20 stuck for 66s! [ 639.909513] Showing busy workqueues and worker pools: [ 639.915404] workqueue events: flags=0x0 [ 639.920197] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 [ 639.920215] pending: drm_fb_helper_damage_work [drm_kms_helper] [ 639.920365] workqueue kblockd: flags=0x18 [ 639.939932] pwq 21: cpus=10 node=1 flags=0x0 nice=-20 active=3/256 refcnt=4 [ 639.939942] in-flight: 1020:blk_mq_run_work_fn [ 639.939955] pending: blk_mq_timeout_work, blk_mq_run_work_fn [ 639.940212] pool 21: cpus=10 node=1 flags=0x0 nice=-20 hung=66s workers=2 idle: 67 Fixes: 6e6fcbc2 ("blk-mq: support batching dispatch in case of io") Signed-off-by:
Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com> Cc: stable@vger.kernel.org # v5.10+ Link: https://lore.kernel.org/linux-block/20220310091649.zypaem5lkyfadymg@shindev/ Link: https://lore.kernel.org/r/20220318022641.133484-1-shinichiro.kawasaki@wdc.com Signed-off-by:
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- Mar 09, 2022
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Ming Lei authored
It is inevitable to cause use-after-free on q->queue_hw_ctx between queue_for_each_hw_ctx() and blk_mq_update_nr_hw_queues(). And converting to xarray can fix the uaf, meantime code gets cleaner. Prepare for converting q->queue_hctx_ctx into xarray, one thing is that xa_for_each() can only accept 'unsigned long' as index, so changes type of hctx index of queue_for_each_hw_ctx() into 'unsigned long'. Reviewed-by:
Hannes Reinecke <hare@suse.de> Reviewed-by:
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- Dec 03, 2021
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Ming Lei authored
It isn't necessary to call blk_mq_run_dispatch_ops() once for issuing single request directly, and enough to do it one time when issuing from whole list. Signed-off-by:
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- Nov 29, 2021
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Christoph Hellwig authored
Move blk_mq_sched_assign_ioc so that many interfaces from the file can be marked static. Rename the function to ioc_find_get_icq as well and return the icq to simplify the interface. Signed-off-by:
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Christoph Hellwig authored
This reverts commit 4896c4e64ba5d5d5acdbcf68c5910dd4f6d8fa62. The helper is not needed any more. Signed-off-by:
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Jan Kara authored
Currently we lookup ICQ only after the request is allocated. However BFQ will want to decide how many scheduler tags it allows a given bfq queue (effectively a process) to consume based on cgroup weight. So provide a function blk_mq_sched_get_icq() so that BFQ can lookup ICQ earlier. Acked-by:
Paolo Valente <paolo.valente@linaro.org> Signed-off-by:
Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20211125133645.27483-1-jack@suse.cz Signed-off-by:
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Jens Axboe authored
The only user of the io_context for IO is BFQ, yet we put the checking and logic of it into the normal IO path. Put the creation into blk_mq_sched_assign_ioc(), and have BFQ use that helper. Reviewed-by:
Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by:
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- Nov 11, 2021
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Ming Lei authored
blk_mq_sched_bio_merge is only called from blk-mq.c:blk_attempt_bio_merge(), which is called when queue usage counter is grabbed already: 1) blk_mq_get_new_requests() 2) blk_mq_get_request() - cached request in current plug owns one queue usage counter So don't grab ->q_usage_counter in blk_mq_sched_bio_merge(), and more importantly this nest way causes hang in blk_mq_freeze_queue_wait(). Cc: Christoph Hellwig <hch@lst.de> Signed-off-by:
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- Nov 05, 2021
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Jens Axboe authored
Retain the old logic for the fops based submit, but for our internal blk_mq_submit_bio(), move the queue entering logic into the core function itself. We need to be a bit careful if going into the scheduler, as a scheduler or queue mappings can arbitrarily change before we have entered the queue. Have the bio scheduler mapping do that separately, it's a very cheap operation compared to actually doing merging locking and lookups. Reviewed-by:
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- Oct 30, 2021
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Jean Sacren authored
In the if branch, e is checked. In the else branch, ->dispatch_busy is merely a number and has no effect on !e. We should remove the check of !e since it is always true. Signed-off-by:
Jean Sacren <sakiwit@gmail.com> Link: https://lore.kernel.org/r/20211029202945.3052-1-sakiwit@gmail.com Signed-off-by:
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- Oct 22, 2021
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John Garry authored
We should not reference the queue tagset in blk_mq_sched_tags_teardown() (see function comment) for the blk-mq flags, so use the passed flags instead. This solves a use-after-free, similarly fixed earlier (and since broken again) in commit f0c1c4d2 ("blk-mq: fix use-after-free in blk_mq_exit_sched"). Reported-by:
Linux Kernel Functional Testing <lkft@linaro.org> Reported-by:
Naresh Kamboju <naresh.kamboju@linaro.org> Tested-by:
Anders Roxell <anders.roxell@linaro.org> Fixes: e155b0c2 ("blk-mq: Use shared tags for shared sbitmap support") Signed-off-by:
John Garry <john.garry@huawei.com> Link: https://lore.kernel.org/r/1634890340-15432-1-git-send-email-john.garry@huawei.com Signed-off-by:
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- Oct 21, 2021
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Pavel Begunkov authored
Combine blk_mq_sched_bio_merge() and blk_attempt_plug_merge() under a common if, so we don't check it twice. Signed-off-by:
Pavel Begunkov <asml.silence@gmail.com> Reviewed-by:
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- Oct 18, 2021
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Jens Axboe authored
These were added as part of early days debugging for blk-mq, and they are not really useful anymore. Rather than spend cycles updating them, just get rid of them. As a bonus, this shrinks the per-cpu software queue size from 256b to 192b. That's a whole cacheline less. Reviewed-by:
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Pavel Begunkov authored
Extract a fast check out of __block_mq_sched_restart() and inline it for performance reasons. Signed-off-by:
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John Garry authored
Now that shared sbitmap support really means shared tags, rename symbols to match that. Signed-off-by:
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John Garry authored
Currently we use separate sbitmap pairs and active_queues atomic_t for shared sbitmap support. However a full sets of static requests are used per HW queue, which is quite wasteful, considering that the total number of requests usable at any given time across all HW queues is limited by the shared sbitmap depth. As such, it is considerably more memory efficient in the case of shared sbitmap to allocate a set of static rqs per tag set or request queue, and not per HW queue. So replace the sbitmap pairs and active_queues atomic_t with a shared tags per tagset and request queue, which will hold a set of shared static rqs. Since there is now no valid HW queue index to be passed to the blk_mq_ops .init and .exit_request callbacks, pass an invalid index token. This changes the semantics of the APIs, such that the callback would need to validate the HW queue index before using it. Currently no user of shared sbitmap actually uses the HW queue index (as would be expected). Signed-off-by:
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John Garry authored
Add a function to combine allocating tags and the associated requests, and factor out common patterns to use this new function. Some function only call blk_mq_alloc_map_and_rqs() now, but more functionality will be added later. Also make blk_mq_alloc_rq_map() and blk_mq_alloc_rqs() static since they are only used in blk-mq.c, and finally rename some functions for conciseness and consistency with other function names: - __blk_mq_alloc_map_and_{request -> rqs}() - blk_mq_alloc_{map_and_requests -> set_map_and_rqs}() Suggested-by: -
John Garry authored
Put the functionality to update the sched shared sbitmap size in a common function. Since the same formula is always used to resize, and it can be got from the request queue argument, so just pass the request queue pointer. Signed-off-by:
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John Garry authored
To be more concise and consistent in naming, rename blk_mq_sched_free_requests() -> blk_mq_sched_free_rqs(). Signed-off-by:
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John Garry authored
Function blk_mq_sched_alloc_tags() does same as __blk_mq_alloc_map_and_request(), so give a similar name to be consistent. Similarly rename label err_free_tags -> err_free_map_and_rqs. Signed-off-by:
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John Garry authored
It is a bit confusing that there is BLKDEV_MAX_RQ and MAX_SCHED_RQ, as the name BLKDEV_MAX_RQ would imply the max requests always, which it is not. Rename to BLKDEV_MAX_RQ to BLKDEV_DEFAULT_RQ, matching its usage - that being the default number of requests assigned when allocating a request queue. Signed-off-by:
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- Jul 27, 2021
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John Garry authored
If the blk_mq_sched_alloc_tags() -> blk_mq_alloc_rqs() call fails, then we call blk_mq_sched_free_tags() -> blk_mq_free_rqs(). It is incorrect to do so, as any rqs would have already been freed in the blk_mq_alloc_rqs() call. Fix by calling blk_mq_free_rq_map() only directly. Fixes: 6917ff0b ("blk-mq-sched: refactor scheduler initialization") Signed-off-by:
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- Jun 25, 2021
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Jan Kara authored
Lockdep complains about lock inversion between ioc->lock and bfqd->lock: bfqd -> ioc: put_io_context+0x33/0x90 -> ioc->lock grabbed blk_mq_free_request+0x51/0x140 blk_put_request+0xe/0x10 blk_attempt_req_merge+0x1d/0x30 elv_attempt_insert_merge+0x56/0xa0 blk_mq_sched_try_insert_merge+0x4b/0x60 bfq_insert_requests+0x9e/0x18c0 -> bfqd->lock grabbed blk_mq_sched_insert_requests+0xd6/0x2b0 blk_mq_flush_plug_list+0x154/0x280 blk_finish_plug+0x40/0x60 ext4_writepages+0x696/0x1320 do_writepages+0x1c/0x80 __filemap_fdatawrite_range+0xd7/0x120 sync_file_range+0xac/0xf0 ioc->bfqd: bfq_exit_icq+0xa3/0xe0 -> bfqd->lock grabbed put_io_context_active+0x78/0xb0 -> ioc->lock grabbed exit_io_context+0x48/0x50 do_exit+0x7e9/0xdd0 do_group_exit+0x54/0xc0 To avoid this inversion we change blk_mq_sched_try_insert_merge() to not free the merged request but rather leave that upto the caller similarly to blk_mq_sched_try_merge(). And in bfq_insert_requests() we make sure to free all the merged requests after dropping bfqd->lock. Fixes: aee69d78 ("block, bfq: introduce the BFQ-v0 I/O scheduler as an extra scheduler") Reviewed-by:
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- Jun 18, 2021
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Damien Le Moal authored
The insert_requests and dispatch_request elevator operations are mandatory for the correct execution of an elevator, and all implemented elevators (bfq, kyber and mq-deadline) implement them. As a result, there is no need to check for these operations before calling them when a queue has an elevator set. This simplifies the code in __blk_mq_sched_dispatch_requests() and blk_mq_sched_insert_request(). To avoid out-of-tree elevators to crash the kernel in case of bad implementation, add a check in elv_register() to verify that these operations are implemented. A small, probably not significant, IOPS improvement of 0.1% is observed with this patch applied (4.117 MIOPS to 4.123 MIOPS, average of 20 fio runs doing 4K random direct reads with psync and 32 jobs). Signed-off-by:
Damien Le Moal <damien.lemoal@wdc.com> Reviewed-by:
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Ming Lei authored
tagset can't be used after blk_cleanup_queue() is returned because freeing tagset usually follows blk_clenup_queue(). Commit d97e594c ("blk-mq: Use request queue-wide tags for tagset-wide sbitmap") adds check on q->tag_set->flags in blk_mq_exit_sched(), and causes use-after-free. Fixes it by using hctx->flags. Reported-by:
<syzbot+77ba3d171a25c56756ea@syzkaller.appspotmail.com> Fixes: d97e594c ("blk-mq: Use request queue-wide tags for tagset-wide sbitmap") Cc: John Garry <john.garry@huawei.com> Signed-off-by:
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- Jun 03, 2021
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Jan Kara authored
Provided the device driver does not implement dispatch budget accounting (which only SCSI does) the loop in __blk_mq_do_dispatch_sched() pulls requests from the IO scheduler as long as it is willing to give out any. That defeats scheduling heuristics inside the scheduler by creating false impression that the device can take more IO when it in fact cannot. For example with BFQ IO scheduler on top of virtio-blk device setting blkio cgroup weight has barely any impact on observed throughput of async IO because __blk_mq_do_dispatch_sched() always sucks out all the IO queued in BFQ. BFQ first submits IO from higher weight cgroups but when that is all dispatched, it will give out IO of lower weight cgroups as well. And then we have to wait for all this IO to be dispatched to the disk (which means lot of it actually has to complete) before the IO scheduler is queried again for dispatching more requests. This completely destroys any service differentiation. So grab request tag for a request pulled out of the IO scheduler already in __blk_mq_do_dispatch_sched() and do not pull any more requests if we cannot get it because we are unlikely to be able to dispatch it. That way only single request is going to wait in the dispatch list for some tag to free. Reviewed-by:
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- May 24, 2021
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John Garry authored
The tags used for an IO scheduler are currently per hctx. As such, when q->nr_hw_queues grows, so does the request queue total IO scheduler tag depth. This may cause problems for SCSI MQ HBAs whose total driver depth is fixed. Ming and Yanhui report higher CPU usage and lower throughput in scenarios where the fixed total driver tag depth is appreciably lower than the total scheduler tag depth: https://lore.kernel.org/linux-block/440dfcfc-1a2c-bd98-1161-cec4d78c6dfc@huawei.com/T/#mc0d6d4f95275a2743d1c8c3e4dc9ff6c9aa3a76b In that scenario, since the scheduler tag is got first, much contention is introduced since a driver tag may not be available after we have got the sched tag. Improve this scenario by introducing request queue-wide tags for when a tagset-wide sbitmap is used. The static sched requests are still allocated per hctx, as requests are initialised per hctx, as in blk_mq_init_request(..., hctx_idx, ...) -> set->ops->init_request(.., hctx_idx, ...). For simplicity of resizing the request queue sbitmap when updating the request queue depth, just init at the max possible size, so we don't need to deal with the possibly with swapping out a new sbitmap for old if we need to grow. Signed-off-by:
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- May 11, 2021
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Omar Sandoval authored
__blk_mq_sched_bio_merge() gets the ctx and hctx for the current CPU and passes the hctx to ->bio_merge(). kyber_bio_merge() then gets the ctx for the current CPU again and uses that to get the corresponding Kyber context in the passed hctx. However, the thread may be preempted between the two calls to blk_mq_get_ctx(), and the ctx returned the second time may no longer correspond to the passed hctx. This "works" accidentally most of the time, but it can cause us to read garbage if the second ctx came from an hctx with more ctx's than the first one (i.e., if ctx->index_hw[hctx->type] > hctx->nr_ctx). This manifested as this UBSAN array index out of bounds error reported by Jakub: UBSAN: array-index-out-of-bounds in ../kernel/locking/qspinlock.c:130:9 index 13106 is out of range for type 'long unsigned int [128]' Call Trace: dump_stack+0xa4/0xe5 ubsan_epilogue+0x5/0x40 __ubsan_handle_out_of_bounds.cold.13+0x2a/0x34 queued_spin_lock_slowpath+0x476/0x480 do_raw_spin_lock+0x1c2/0x1d0 kyber_bio_merge+0x112/0x180 blk_mq_submit_bio+0x1f5/0x1100 submit_bio_noacct+0x7b0/0x870 submit_bio+0xc2/0x3a0 btrfs_map_bio+0x4f0/0x9d0 btrfs_submit_data_bio+0x24e/0x310 submit_one_bio+0x7f/0xb0 submit_extent_page+0xc4/0x440 __extent_writepage_io+0x2b8/0x5e0 __extent_writepage+0x28d/0x6e0 extent_write_cache_pages+0x4d7/0x7a0 extent_writepages+0xa2/0x110 do_writepages+0x8f/0x180 __writeback_single_inode+0x99/0x7f0 writeback_sb_inodes+0x34e/0x790 __writeback_inodes_wb+0x9e/0x120 wb_writeback+0x4d2/0x660 wb_workfn+0x64d/0xa10 process_one_work+0x53a/0xa80 worker_thread+0x69/0x5b0 kthread+0x20b/0x240 ret_from_fork+0x1f/0x30 Only Kyber uses the hctx, so fix it by passing the request_queue to ->bio_merge() instead. BFQ and mq-deadline just use that, and Kyber can map the queues itself to avoid the mismatch. Fixes: a6088845 ("block: kyber: make kyber more friendly with merging") Reported-by:
Jakub Kicinski <kuba@kernel.org> Signed-off-by:
Omar Sandoval <osandov@fb.com> Link: https://lore.kernel.org/r/c7598605401a48d5cfeadebb678abd10af22b83f.1620691329.git.osandov@fb.com Signed-off-by:
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- Apr 08, 2021
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Sami Tolvanen authored
list_sort() internally casts the comparison function passed to it to a different type with constant struct list_head pointers, and uses this pointer to call the functions, which trips indirect call Control-Flow Integrity (CFI) checking. Instead of removing the consts, this change defines the list_cmp_func_t type and changes the comparison function types of all list_sort() callers to use const pointers, thus avoiding type mismatches. Suggested-by:
Nick Desaulniers <ndesaulniers@google.com> Signed-off-by:
Sami Tolvanen <samitolvanen@google.com> Reviewed-by:
Kees Cook <keescook@chromium.org> Tested-by:
Nathan Chancellor <nathan@kernel.org> Signed-off-by:
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