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2018-12-11lightnvm: pblk: fix chunk close trace event checkHans Holmberg1-1/+1
The check for chunk closes suffers from an off-by-one issue, leading to chunk close events not being traced. Fixes: 4c44abf43d00 ("lightnvm: pblk: add trace events for chunk states") Signed-off-by: Hans Holmberg <hans.holmberg@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-11lightnvm: Fix uninitialized return value in nvm_get_chunk_meta()Geert Uytterhoeven2-2/+3
With gcc 4.1: drivers/lightnvm/core.c: In function ‘nvm_get_bb_meta’: drivers/lightnvm/core.c:977: warning: ‘ret’ may be used uninitialized in this function and drivers/nvme/host/lightnvm.c: In function ‘nvme_nvm_get_chk_meta’: drivers/nvme/host/lightnvm.c:580: warning: ‘ret’ may be used uninitialized in this function Indeed, if (for the former) the number of channels or LUNs is zero, or (for both) the passed number of chunks is zero, ret will be returned uninitialized. Fix this by preinitializing ret to zero. Fixes: aff3fb18f957de93 ("lightnvm: move bad block and chunk state logic to core") Fixes: a294c199455187d1 ("lightnvm: implement get log report chunk helpers") Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-11lightnvm: pblk: ignore the smeta oob area scanZhoujie Wu1-2/+3
The smeta area l2p mapping is empty, and actually the recovery procedure only need to restore data sector's l2p mapping. So ignore the smeta oob scan. Signed-off-by: Zhoujie Wu <zjwu@marvell.com> Reviewed-by: Javier González <javier@javigon.com> Reviewed-by: Hans Holmberg <hans.holmberg@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-11dm: fix request-based dm's use of dm_wait_for_completionMike Snitzer2-5/+11
The md->wait waitqueue is used by both bio-based and request-based DM. Commit dbd3bbd291 ("dm rq: leverage blk_mq_queue_busy() to check for outstanding IO") lost sight of the requirement that dm_wait_for_completion() must work with all types of DM devices. Fix md_in_flight() to call the blk-mq or bio-based method accordingly. Fixes: dbd3bbd291 ("dm rq: leverage blk_mq_queue_busy() to check for outstanding IO") Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-11nvme: fix irq vs io_queue calculationsJens Axboe1-35/+29
Guenter reported an boot hang issue on HPPA after we default to 0 poll queues. We have two issues in the queue count calculations: 1) We don't separate the poll queues from the read/write queues. This is important, since the former doesn't need interrupts. 2) The adjust logic is broken. Adjust the poll queue count before doing nvme_calc_io_queues(). The poll queue count is only limited by the IO queue count we were able to get from the controller, not failures in the IRQ allocation loop. This leaves nvme_calc_io_queues() just adjusting the read/write queue map. Reported-by: Reported-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-10dm: fix inflight IO checkJens Axboe1-8/+6
After switching to percpu inflight counters, the inflight check is totally buggy. It's perfectly valid for some counters to be non-zero while having a total inflight IO count of 0, that's how these kinds of counters work (inc on one CPU, dec on another). Fix the md_in_flight() check to sum all counters before returning a false positive, potentially. While at it, remove the inflight read for IO completion. We don't need it, just wake anyone that's waiting for the IO count to drop to zero. The caller needs to re-check that value anyway when woken, which it does. Fixes: 6f75723190d8 ("dm: remove the pending IO accounting") Acked-by: Mike Snitzer <snitzer@redhat.com> Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-10mtip32xx: use BLK_STS_DEV_RESOURCE for device resourcesJens Axboe1-2/+2
For cases where we can only fail with IO in-flight, we should be using BLK_STS_DEV_RESOURCE instead of BLK_STS_RESOURCE. The latter refers to system wide resource constraints. Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-10mtip32xx: avoid using semaphoresArnd Bergmann2-5/+5
The "cmd_slot_unal" semaphore is never used in a blocking way but only as an atomic counter. Change the code to using atomic_dec_if_positive() as a better API. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-10dm: remove the pending IO accountingMikulas Patocka2-21/+15
Remove the "pending" atomic counters, that duplicate block-core's in_flight counters, and update md_in_flight() to look at percpu in_flight counters. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-10block: return just one value from part_in_flightMikulas Patocka5-36/+22
The previous patches deleted all the code that needed the second value returned from part_in_flight - now the kernel only uses the first value. Consequently, part_in_flight (and blk_mq_in_flight) may be changed so that it only returns one value. This patch just refactors the code, there's no functional change. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-10block: switch to per-cpu in-flight countersMikulas Patocka2-17/+55
Now when part_round_stats is gone, we can switch to per-cpu in-flight counters. We use the local-atomic type local_t, so that if part_inc_in_flight or part_dec_in_flight is reentrantly called from an interrupt, the value will be correct. The other counters could be corrupted due to reentrant interrupt, but the corruption only results in slight counter skew - the in_flight counter must be exact, so it needs local_t. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-10block: delete part_round_stats and switch to less precise countingMikulas Patocka6-70/+26
We want to convert to per-cpu in_flight counters. The function part_round_stats needs the in_flight counter every jiffy, it would be too costly to sum all the percpu variables every jiffy, so it must be deleted. part_round_stats is used to calculate two counters - time_in_queue and io_ticks. time_in_queue can be calculated without part_round_stats, by adding the duration of the I/O when the I/O ends (the value is almost as exact as the previously calculated value, except that time for in-progress I/Os is not counted). io_ticks can be approximated by increasing the value when I/O is started or ended and the jiffies value has changed. If the I/Os take less than a jiffy, the value is as exact as the previously calculated value. If the I/Os take more than a jiffy, io_ticks can drift behind the previously calculated value. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-10block: stop passing 'cpu' to all percpu stats methodsMike Snitzer7-52/+46
All of part_stat_* and related methods are used with preempt disabled, so there is no need to pass cpu around to allow of them. Just call smp_processor_id() as needed. Suggested-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-10dm rq: leverage blk_mq_queue_busy() to check for outstanding IOMike Snitzer1-5/+4
Now that request-based dm-multipath only supports blk-mq, make use of the newly introduced blk_mq_queue_busy() to check for outstanding IO -- rather than (ab)using the block core's in_flight counters. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-10dm: dont rewrite dm_disk(md)->part0.in_flightMikulas Patocka1-3/+1
generic_start_io_acct and generic_end_io_acct already update the variable in_flight using atomic operations, so we don't have to overwrite them again. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-09sbitmap: silence bogus lockdep IRQ warningJens Axboe1-0/+8
Ming reports that lockdep spews the following trace. What this essentially says is that the sbitmap swap_lock was used inconsistently in IRQ enabled and disabled context, and that is usually indicative of a bug that will cause a deadlock. For this case, it's a false positive. The swap_lock is used from process context only, when we swap the bits in the word and cleared mask. We also end up doing that when we are getting a driver tag, from the blk_mq_mark_tag_wait(), and from there we hold the waitqueue lock with IRQs disabled. However, this isn't from an actual IRQ, it's still process context. In lieu of a better way to fix this, simply always disable interrupts when grabbing the swap_lock if lockdep is enabled. [ 100.967642] ================start test sanity/001================ [ 101.238280] null: module loaded [ 106.093735] [ 106.094012] ===================================================== [ 106.094854] WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected [ 106.095759] 4.20.0-rc3_5d2ee7122c73_for-next+ #1 Not tainted [ 106.096551] ----------------------------------------------------- [ 106.097386] fio/1043 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire: [ 106.098231] 000000004c43fa71 (&(&sb->map[i].swap_lock)->rlock){+.+.}, at: sbitmap_get+0xd5/0x22c [ 106.099431] [ 106.099431] and this task is already holding: [ 106.100229] 000000007eec8b2f (&(&hctx->dispatch_wait_lock)->rlock){....}, at: blk_mq_dispatch_rq_list+0x4c1/0xd7c [ 106.101630] which would create a new lock dependency: [ 106.102326] (&(&hctx->dispatch_wait_lock)->rlock){....} -> (&(&sb->map[i].swap_lock)->rlock){+.+.} [ 106.103553] [ 106.103553] but this new dependency connects a SOFTIRQ-irq-safe lock: [ 106.104580] (&sbq->ws[i].wait){..-.} [ 106.104582] [ 106.104582] ... which became SOFTIRQ-irq-safe at: [ 106.105751] _raw_spin_lock_irqsave+0x4b/0x82 [ 106.106284] __wake_up_common_lock+0x119/0x1b9 [ 106.106825] sbitmap_queue_wake_up+0x33f/0x383 [ 106.107456] sbitmap_queue_clear+0x4c/0x9a [ 106.108046] __blk_mq_free_request+0x188/0x1d3 [ 106.108581] blk_mq_free_request+0x23b/0x26b [ 106.109102] scsi_end_request+0x345/0x5d7 [ 106.109587] scsi_io_completion+0x4b5/0x8f0 [ 106.110099] scsi_finish_command+0x412/0x456 [ 106.110615] scsi_softirq_done+0x23f/0x29b [ 106.111115] blk_done_softirq+0x2a7/0x2e6 [ 106.111608] __do_softirq+0x360/0x6ad [ 106.112062] run_ksoftirqd+0x2f/0x5b [ 106.112499] smpboot_thread_fn+0x3a5/0x3db [ 106.113000] kthread+0x1d4/0x1e4 [ 106.113457] ret_from_fork+0x3a/0x50 [ 106.113969] [ 106.113969] to a SOFTIRQ-irq-unsafe lock: [ 106.114672] (&(&sb->map[i].swap_lock)->rlock){+.+.} [ 106.114674] [ 106.114674] ... which became SOFTIRQ-irq-unsafe at: [ 106.116000] ... [ 106.116003] _raw_spin_lock+0x33/0x64 [ 106.116676] sbitmap_get+0xd5/0x22c [ 106.117134] __sbitmap_queue_get+0xe8/0x177 [ 106.117731] __blk_mq_get_tag+0x1e6/0x22d [ 106.118286] blk_mq_get_tag+0x1db/0x6e4 [ 106.118756] blk_mq_get_driver_tag+0x161/0x258 [ 106.119383] blk_mq_dispatch_rq_list+0x28e/0xd7c [ 106.120043] blk_mq_do_dispatch_sched+0x23a/0x287 [ 106.120607] blk_mq_sched_dispatch_requests+0x379/0x3fc [ 106.121234] __blk_mq_run_hw_queue+0x137/0x17e [ 106.121781] __blk_mq_delay_run_hw_queue+0x80/0x25f [ 106.122366] blk_mq_run_hw_queue+0x151/0x187 [ 106.122887] blk_mq_sched_insert_requests+0x13f/0x175 [ 106.123492] blk_mq_flush_plug_list+0x7d6/0x81b [ 106.124042] blk_flush_plug_list+0x392/0x3d7 [ 106.124557] blk_finish_plug+0x37/0x4f [ 106.125019] read_pages+0x3ef/0x430 [ 106.125446] __do_page_cache_readahead+0x18e/0x2fc [ 106.126027] force_page_cache_readahead+0x121/0x133 [ 106.126621] page_cache_sync_readahead+0x35f/0x3bb [ 106.127229] generic_file_buffered_read+0x410/0x1860 [ 106.127932] __vfs_read+0x319/0x38f [ 106.128415] vfs_read+0xd2/0x19a [ 106.128817] ksys_read+0xb9/0x135 [ 106.129225] do_syscall_64+0x140/0x385 [ 106.129684] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 106.130292] [ 106.130292] other info that might help us debug this: [ 106.130292] [ 106.131226] Chain exists of: [ 106.131226] &sbq->ws[i].wait --> &(&hctx->dispatch_wait_lock)->rlock --> &(&sb->map[i].swap_lock)->rlock [ 106.131226] [ 106.132865] Possible interrupt unsafe locking scenario: [ 106.132865] [ 106.133659] CPU0 CPU1 [ 106.134194] ---- ---- [ 106.134733] lock(&(&sb->map[i].swap_lock)->rlock); [ 106.135318] local_irq_disable(); [ 106.136014] lock(&sbq->ws[i].wait); [ 106.136747] lock(&(&hctx->dispatch_wait_lock)->rlock); [ 106.137742] <Interrupt> [ 106.138110] lock(&sbq->ws[i].wait); [ 106.138625] [ 106.138625] *** DEADLOCK *** [ 106.138625] [ 106.139430] 3 locks held by fio/1043: [ 106.139947] #0: 0000000076ff0fd9 (rcu_read_lock){....}, at: hctx_lock+0x29/0xe8 [ 106.140813] #1: 000000002feb1016 (&sbq->ws[i].wait){..-.}, at: blk_mq_dispatch_rq_list+0x4ad/0xd7c [ 106.141877] #2: 000000007eec8b2f (&(&hctx->dispatch_wait_lock)->rlock){....}, at: blk_mq_dispatch_rq_list+0x4c1/0xd7c [ 106.143267] [ 106.143267] the dependencies between SOFTIRQ-irq-safe lock and the holding lock: [ 106.144351] -> (&sbq->ws[i].wait){..-.} ops: 82 { [ 106.144926] IN-SOFTIRQ-W at: [ 106.145314] _raw_spin_lock_irqsave+0x4b/0x82 [ 106.146042] __wake_up_common_lock+0x119/0x1b9 [ 106.146785] sbitmap_queue_wake_up+0x33f/0x383 [ 106.147567] sbitmap_queue_clear+0x4c/0x9a [ 106.148379] __blk_mq_free_request+0x188/0x1d3 [ 106.149148] blk_mq_free_request+0x23b/0x26b [ 106.149864] scsi_end_request+0x345/0x5d7 [ 106.150546] scsi_io_completion+0x4b5/0x8f0 [ 106.151367] scsi_finish_command+0x412/0x456 [ 106.152157] scsi_softirq_done+0x23f/0x29b [ 106.152855] blk_done_softirq+0x2a7/0x2e6 [ 106.153537] __do_softirq+0x360/0x6ad [ 106.154280] run_ksoftirqd+0x2f/0x5b [ 106.155020] smpboot_thread_fn+0x3a5/0x3db [ 106.155828] kthread+0x1d4/0x1e4 [ 106.156526] ret_from_fork+0x3a/0x50 [ 106.157267] INITIAL USE at: [ 106.157713] _raw_spin_lock_irqsave+0x4b/0x82 [ 106.158542] prepare_to_wait_exclusive+0xa8/0x215 [ 106.159421] blk_mq_get_tag+0x34f/0x6e4 [ 106.160186] blk_mq_get_request+0x48e/0xaef [ 106.160997] blk_mq_make_request+0x27e/0xbd2 [ 106.161828] generic_make_request+0x4d1/0x873 [ 106.162661] submit_bio+0x20c/0x253 [ 106.163379] mpage_bio_submit+0x44/0x4b [ 106.164142] mpage_readpages+0x3c2/0x407 [ 106.164919] read_pages+0x13a/0x430 [ 106.165633] __do_page_cache_readahead+0x18e/0x2fc [ 106.166530] force_page_cache_readahead+0x121/0x133 [ 106.167439] page_cache_sync_readahead+0x35f/0x3bb [ 106.168337] generic_file_buffered_read+0x410/0x1860 [ 106.169255] __vfs_read+0x319/0x38f [ 106.169977] vfs_read+0xd2/0x19a [ 106.170662] ksys_read+0xb9/0x135 [ 106.171356] do_syscall_64+0x140/0x385 [ 106.172120] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 106.173051] } [ 106.173308] ... key at: [<ffffffff85094600>] __key.26481+0x0/0x40 [ 106.174219] ... acquired at: [ 106.174646] _raw_spin_lock+0x33/0x64 [ 106.175183] blk_mq_dispatch_rq_list+0x4c1/0xd7c [ 106.175843] blk_mq_do_dispatch_sched+0x23a/0x287 [ 106.176518] blk_mq_sched_dispatch_requests+0x379/0x3fc [ 106.177262] __blk_mq_run_hw_queue+0x137/0x17e [ 106.177900] __blk_mq_delay_run_hw_queue+0x80/0x25f [ 106.178591] blk_mq_run_hw_queue+0x151/0x187 [ 106.179207] blk_mq_sched_insert_requests+0x13f/0x175 [ 106.179926] blk_mq_flush_plug_list+0x7d6/0x81b [ 106.180571] blk_flush_plug_list+0x392/0x3d7 [ 106.181187] blk_finish_plug+0x37/0x4f [ 106.181737] __se_sys_io_submit+0x171/0x304 [ 106.182346] do_syscall_64+0x140/0x385 [ 106.182895] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 106.183607] [ 106.183830] -> (&(&hctx->dispatch_wait_lock)->rlock){....} ops: 1 { [ 106.184691] INITIAL USE at: [ 106.185119] _raw_spin_lock+0x33/0x64 [ 106.185838] blk_mq_dispatch_rq_list+0x4c1/0xd7c [ 106.186697] blk_mq_do_dispatch_sched+0x23a/0x287 [ 106.187551] blk_mq_sched_dispatch_requests+0x379/0x3fc [ 106.188481] __blk_mq_run_hw_queue+0x137/0x17e [ 106.189307] __blk_mq_delay_run_hw_queue+0x80/0x25f [ 106.190189] blk_mq_run_hw_queue+0x151/0x187 [ 106.190989] blk_mq_sched_insert_requests+0x13f/0x175 [ 106.191902] blk_mq_flush_plug_list+0x7d6/0x81b [ 106.192739] blk_flush_plug_list+0x392/0x3d7 [ 106.193535] blk_finish_plug+0x37/0x4f [ 106.194269] __se_sys_io_submit+0x171/0x304 [ 106.195059] do_syscall_64+0x140/0x385 [ 106.195794] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 106.196705] } [ 106.196950] ... key at: [<ffffffff84880620>] __key.51231+0x0/0x40 [ 106.197853] ... acquired at: [ 106.198270] lock_acquire+0x280/0x2f3 [ 106.198806] _raw_spin_lock+0x33/0x64 [ 106.199337] sbitmap_get+0xd5/0x22c [ 106.199850] __sbitmap_queue_get+0xe8/0x177 [ 106.200450] __blk_mq_get_tag+0x1e6/0x22d [ 106.201035] blk_mq_get_tag+0x1db/0x6e4 [ 106.201589] blk_mq_get_driver_tag+0x161/0x258 [ 106.202237] blk_mq_dispatch_rq_list+0x5b9/0xd7c [ 106.202902] blk_mq_do_dispatch_sched+0x23a/0x287 [ 106.203572] blk_mq_sched_dispatch_requests+0x379/0x3fc [ 106.204316] __blk_mq_run_hw_queue+0x137/0x17e [ 106.204956] __blk_mq_delay_run_hw_queue+0x80/0x25f [ 106.205649] blk_mq_run_hw_queue+0x151/0x187 [ 106.206269] blk_mq_sched_insert_requests+0x13f/0x175 [ 106.206997] blk_mq_flush_plug_list+0x7d6/0x81b [ 106.207644] blk_flush_plug_list+0x392/0x3d7 [ 106.208264] blk_finish_plug+0x37/0x4f [ 106.208814] __se_sys_io_submit+0x171/0x304 [ 106.209415] do_syscall_64+0x140/0x385 [ 106.209965] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 106.210684] [ 106.210904] [ 106.210904] the dependencies between the lock to be acquired [ 106.210905] and SOFTIRQ-irq-unsafe lock: [ 106.212541] -> (&(&sb->map[i].swap_lock)->rlock){+.+.} ops: 1969 { [ 106.213393] HARDIRQ-ON-W at: [ 106.213840] _raw_spin_lock+0x33/0x64 [ 106.214570] sbitmap_get+0xd5/0x22c [ 106.215282] __sbitmap_queue_get+0xe8/0x177 [ 106.216086] __blk_mq_get_tag+0x1e6/0x22d [ 106.216876] blk_mq_get_tag+0x1db/0x6e4 [ 106.217627] blk_mq_get_driver_tag+0x161/0x258 [ 106.218465] blk_mq_dispatch_rq_list+0x28e/0xd7c [ 106.219326] blk_mq_do_dispatch_sched+0x23a/0x287 [ 106.220198] blk_mq_sched_dispatch_requests+0x379/0x3fc [ 106.221138] __blk_mq_run_hw_queue+0x137/0x17e [ 106.221975] __blk_mq_delay_run_hw_queue+0x80/0x25f [ 106.222874] blk_mq_run_hw_queue+0x151/0x187 [ 106.223686] blk_mq_sched_insert_requests+0x13f/0x175 [ 106.224597] blk_mq_flush_plug_list+0x7d6/0x81b [ 106.225444] blk_flush_plug_list+0x392/0x3d7 [ 106.226255] blk_finish_plug+0x37/0x4f [ 106.227006] read_pages+0x3ef/0x430 [ 106.227717] __do_page_cache_readahead+0x18e/0x2fc [ 106.228595] force_page_cache_readahead+0x121/0x133 [ 106.229491] page_cache_sync_readahead+0x35f/0x3bb [ 106.230373] generic_file_buffered_read+0x410/0x1860 [ 106.231277] __vfs_read+0x319/0x38f [ 106.231986] vfs_read+0xd2/0x19a [ 106.232666] ksys_read+0xb9/0x135 [ 106.233350] do_syscall_64+0x140/0x385 [ 106.234097] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 106.235012] SOFTIRQ-ON-W at: [ 106.235460] _raw_spin_lock+0x33/0x64 [ 106.236195] sbitmap_get+0xd5/0x22c [ 106.236913] __sbitmap_queue_get+0xe8/0x177 [ 106.237715] __blk_mq_get_tag+0x1e6/0x22d [ 106.238488] blk_mq_get_tag+0x1db/0x6e4 [ 106.239244] blk_mq_get_driver_tag+0x161/0x258 [ 106.240079] blk_mq_dispatch_rq_list+0x28e/0xd7c [ 106.240937] blk_mq_do_dispatch_sched+0x23a/0x287 [ 106.241806] blk_mq_sched_dispatch_requests+0x379/0x3fc [ 106.242751] __blk_mq_run_hw_queue+0x137/0x17e [ 106.243579] __blk_mq_delay_run_hw_queue+0x80/0x25f [ 106.244469] blk_mq_run_hw_queue+0x151/0x187 [ 106.245277] blk_mq_sched_insert_requests+0x13f/0x175 [ 106.246191] blk_mq_flush_plug_list+0x7d6/0x81b [ 106.247044] blk_flush_plug_list+0x392/0x3d7 [ 106.247859] blk_finish_plug+0x37/0x4f [ 106.248749] read_pages+0x3ef/0x430 [ 106.249463] __do_page_cache_readahead+0x18e/0x2fc [ 106.250357] force_page_cache_readahead+0x121/0x133 [ 106.251263] page_cache_sync_readahead+0x35f/0x3bb [ 106.252157] generic_file_buffered_read+0x410/0x1860 [ 106.253084] __vfs_read+0x319/0x38f [ 106.253808] vfs_read+0xd2/0x19a [ 106.254488] ksys_read+0xb9/0x135 [ 106.255186] do_syscall_64+0x140/0x385 [ 106.255943] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 106.256867] INITIAL USE at: [ 106.257300] _raw_spin_lock+0x33/0x64 [ 106.258033] sbitmap_get+0xd5/0x22c [ 106.258747] __sbitmap_queue_get+0xe8/0x177 [ 106.259542] __blk_mq_get_tag+0x1e6/0x22d [ 106.260320] blk_mq_get_tag+0x1db/0x6e4 [ 106.261072] blk_mq_get_driver_tag+0x161/0x258 [ 106.261902] blk_mq_dispatch_rq_list+0x28e/0xd7c [ 106.262762] blk_mq_do_dispatch_sched+0x23a/0x287 [ 106.263626] blk_mq_sched_dispatch_requests+0x379/0x3fc [ 106.264571] __blk_mq_run_hw_queue+0x137/0x17e [ 106.265409] __blk_mq_delay_run_hw_queue+0x80/0x25f [ 106.266302] blk_mq_run_hw_queue+0x151/0x187 [ 106.267111] blk_mq_sched_insert_requests+0x13f/0x175 [ 106.268028] blk_mq_flush_plug_list+0x7d6/0x81b [ 106.268878] blk_flush_plug_list+0x392/0x3d7 [ 106.269694] blk_finish_plug+0x37/0x4f [ 106.270432] read_pages+0x3ef/0x430 [ 106.271139] __do_page_cache_readahead+0x18e/0x2fc [ 106.272040] force_page_cache_readahead+0x121/0x133 [ 106.272932] page_cache_sync_readahead+0x35f/0x3bb [ 106.273811] generic_file_buffered_read+0x410/0x1860 [ 106.274709] __vfs_read+0x319/0x38f [ 106.275407] vfs_read+0xd2/0x19a [ 106.276074] ksys_read+0xb9/0x135 [ 106.276764] do_syscall_64+0x140/0x385 [ 106.277500] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 106.278417] } [ 106.278676] ... key at: [<ffffffff85094640>] __key.26212+0x0/0x40 [ 106.279586] ... acquired at: [ 106.280026] lock_acquire+0x280/0x2f3 [ 106.280559] _raw_spin_lock+0x33/0x64 [ 106.281101] sbitmap_get+0xd5/0x22c [ 106.281610] __sbitmap_queue_get+0xe8/0x177 [ 106.282221] __blk_mq_get_tag+0x1e6/0x22d [ 106.282809] blk_mq_get_tag+0x1db/0x6e4 [ 106.283368] blk_mq_get_driver_tag+0x161/0x258 [ 106.284018] blk_mq_dispatch_rq_list+0x5b9/0xd7c [ 106.284685] blk_mq_do_dispatch_sched+0x23a/0x287 [ 106.285371] blk_mq_sched_dispatch_requests+0x379/0x3fc [ 106.286135] __blk_mq_run_hw_queue+0x137/0x17e [ 106.286806] __blk_mq_delay_run_hw_queue+0x80/0x25f [ 106.287515] blk_mq_run_hw_queue+0x151/0x187 [ 106.288149] blk_mq_sched_insert_requests+0x13f/0x175 [ 106.289041] blk_mq_flush_plug_list+0x7d6/0x81b [ 106.289912] blk_flush_plug_list+0x392/0x3d7 [ 106.290590] blk_finish_plug+0x37/0x4f [ 106.291238] __se_sys_io_submit+0x171/0x304 [ 106.291864] do_syscall_64+0x140/0x385 [ 106.292534] entry_SYSCALL_64_after_hwframe+0x49/0xbe Reported-by: Ming Lei <ming.lei@redhat.com> Tested-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-09Linux 4.20-rc6Linus Torvalds1-1/+1
2018-12-09net/sched: cls_flower: Reject duplicated rules also under skip_swOr Gerlitz1-13/+10
Currently, duplicated rules are rejected only for skip_hw or "none", hence allowing users to push duplicates into HW for no reason. Use the flower tables to protect for that. Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by: Paul Blakey <paulb@mellanox.com> Reported-by: Chris Mi <chrism@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-12-09bnxt_en: Fix _bnxt_get_max_rings() for 57500 chips.Michael Chan1-4/+12
The CP rings are accounted differently on the new 57500 chips. There must be enough CP rings for the sum of RX and TX rings on the new chips. The current logic may be over-estimating the RX and TX rings. The output parameter max_cp should be the maximum NQs capped by MSIX vectors available for networking in the context of 57500 chips. The existing code which uses CMPL rings capped by the MSIX vectors works most of the time but is not always correct. Signed-off-by: Michael Chan <michael.chan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-12-09bnxt_en: Fix NQ/CP rings accounting on the new 57500 chips.Michael Chan1-6/+23
The new 57500 chips have introduced the NQ structure in addition to the existing CP rings in all chips. We need to introduce a new bnxt_nq_rings_in_use(). On legacy chips, the 2 functions are the same and one will just call the other. On the new chips, they refer to the 2 separate ring structures. The new function is now called to determine the resource (NQ or CP rings) associated with MSIX that are in use. On 57500 chips, the RDMA driver does not use the CP rings so we don't need to do the subtraction adjustment. Fixes: 41e8d7983752 ("bnxt_en: Modify the ring reservation functions for 57500 series chips.") Signed-off-by: Michael Chan <michael.chan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-12-09bnxt_en: Keep track of reserved IRQs.Michael Chan3-3/+8
The new 57500 chips use 1 NQ per MSIX vector, whereas legacy chips use 1 CP ring per MSIX vector. To better unify this, add a resv_irqs field to struct bnxt_hw_resc. On legacy chips, we initialize resv_irqs with resv_cp_rings. On new chips, we initialize it with the allocated MSIX resources. Signed-off-by: Michael Chan <michael.chan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-12-09bnxt_en: Fix CNP CoS queue regression.Michael Chan1-0/+7
Recent changes to support the 57500 devices have created this regression. The bnxt_hwrm_queue_qportcfg() call was moved to be called earlier before the RDMA support was determined, causing the CoS queues configuration to be set before knowing whether RDMA was supported or not. Fix it by moving it to the right place right after RDMA support is determined. Fixes: 98f04cf0f1fc ("bnxt_en: Check context memory requirements from firmware.") Signed-off-by: Michael Chan <michael.chan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-12-08net/mlx4_core: Correctly set PFC param if global pause is turned off.Tarick Bedeir1-2/+2
rx_ppp and tx_ppp can be set between 0 and 255, so don't clamp to 1. Fixes: 6e8814ceb7e8 ("net/mlx4_en: Fix mixed PFC and Global pause user control requests") Signed-off-by: Tarick Bedeir <tarick@google.com> Reviewed-by: Eran Ben Elisha <eranbe@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-12-08Revert "mm, thp: consolidate THP gfp handling into alloc_hugepage_direct_gfpmask"David Rientjes4-22/+51
This reverts commit 89c83fb539f95491be80cdd5158e6f0ce329e317. This should have been done as part of 2f0799a0ffc0 ("mm, thp: restore node-local hugepage allocations"). The movement of the thp allocation policy from alloc_pages_vma() to alloc_hugepage_direct_gfpmask() was intended to only set __GFP_THISNODE for mempolicies that are not MPOL_BIND whereas the revert could set this regardless of mempolicy. While the check for MPOL_BIND between alloc_hugepage_direct_gfpmask() and alloc_pages_vma() was racy, that has since been removed since the revert. What is left is the possibility to use __GFP_THISNODE in policy_node() when it is unexpected because the special handling for hugepages in alloc_pages_vma() was removed as part of the consolidation. Secondly, prior to 89c83fb539f9, alloc_pages_vma() implemented a somewhat different policy for hugepage allocations, which were allocated through alloc_hugepage_vma(). For hugepage allocations, if the allocating process's node is in the set of allowed nodes, allocate with __GFP_THISNODE for that node (for MPOL_PREFERRED, use that node with __GFP_THISNODE instead). This was changed for shmem_alloc_hugepage() to allow fallback to other nodes in 89c83fb539f9 as it did for new_page() in mm/mempolicy.c which is functionally different behavior and removes the requirement to only allocate hugepages locally. So this commit does a full revert of 89c83fb539f9 instead of the partial revert that was done in 2f0799a0ffc0. The result is the same thp allocation policy for 4.20 that was in 4.19. Fixes: 89c83fb539f9 ("mm, thp: consolidate THP gfp handling into alloc_hugepage_direct_gfpmask") Fixes: 2f0799a0ffc0 ("mm, thp: restore node-local hugepage allocations") Signed-off-by: David Rientjes <rientjes@google.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Michal Hocko <mhocko@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-12-07Revert "net/ibm/emac: wrong bit is used for STA control"Benjamin Herrenschmidt1-1/+1
This reverts commit 624ca9c33c8a853a4a589836e310d776620f4ab9. This commit is completely bogus. The STACR register has two formats, old and new, depending on the version of the IP block used. There's a pair of device-tree properties that can be used to specify the format used: has-inverted-stacr-oc has-new-stacr-staopc What this commit did was to change the bit definition used with the old parts to match the new parts. This of course breaks the driver on all the old ones. Instead, the author should have set the appropriate properties in the device-tree for the variant used on his board. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-12-07scsi: Fix a harmless double shift bugDan Carpenter1-1/+1
Smatch generates a warning: drivers/scsi/scsi_lib.c:1656 scsi_mq_done() warn: test_bit() takes a bit number The problem is that SCMD_STATE_COMPLETE is supposed to be bit number 0 and not a mask like "(1 << 0)". It is used like this: if (test_and_set_bit(SCMD_STATE_COMPLETE, &scmd->state)) The test_and_set_bit() has a shift built in so it's a double left shift and uses bit number 1 instead of number 0. This bug is harmless because it's done consistently and it doesn't clash with any other flags. Fixes: f1342709d18a ("scsi: Do not rely on blk-mq for double completions") Reviewed-by: Keith Busch <keith.busch@intel.com> Acked-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-07nvme: remove unused function nvme_ctrl_readyIsrael Rukshin1-9/+0
Signed-off-by: Israel Rukshin <israelr@mellanox.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Max Gurtovoy <maxg@mellanox.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-07nvme: implement Enhanced Command RetryKeith Busch3-3/+62
A controller may have an internal state that is not able to successfully process commands for a short duration. In such states, an immediate command requeue is expected to fail. The driver may exceed its max retry count, which permanently ends the command in failure when the same command would succeed after waiting for the controller to be ready. NVMe ratified TP 4033 provides a delay hint in the completion status code for failed commands. Implement the retry delay based on the command completion status and the controller's requested delay. Note that requeued commands are handled per request_queue, not per individual request. If multiple commands fail, the controller should consistently report the desired delay time for retryable commands in all CQEs, otherwise the requeue list may be kicked too soon. Signed-off-by: Keith Busch <keith.busch@intel.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-07nvmet: fix the structure member indentationChaitanya Kulkarni1-4/+4
This is a cleanup patch which fixes the structure member indentation introduced by the p2p: commit c6925093d0b2 ("nvmet: Optionally use PCI P2P memory"). We don't change any functionality in this patch. This is needed so that any future members will also follow the uniform indentation. Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Acked-by: Logan Gunthorpe <logang@deltatee.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-07nvmet: use unlikely for req status checkChaitanya Kulkarni1-1/+1
This patch adds unlikely in the nvmet request completion path for the status check in the low level function __nvmet_req_complete. This is helpful in the scenario where host and target connection is working smoothly. Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-07nvmet-rdma: Add unlikely for response allocated checkIsrael Rukshin1-1/+1
Signed-off-by: Israel Rukshin <israelr@mellanox.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Max Gurtovoy <maxg@mellanox.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-07nvme: Remove unused forward declarationIsrael Rukshin1-1/+0
Signed-off-by: Israel Rukshin <israelr@mellanox.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Max Gurtovoy <maxg@mellanox.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-07nvme: disable fabrics SQ flow control when asked by the userSagi Grimberg2-1/+14
As for now, we don't care about sq_head pointer updates anyway, so at least allow the controller to micro-optimize by omiting this update. Note that we will probably need to support it when a controller that requires this comes along. Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-07nvmet: expose support for fabrics SQ flow control disable in treqSagi Grimberg2-3/+6
Technical Proposal introduces an indication for SQ flow control disable support. Expose it since we are able to operate in this mode. Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-07nvmet: don't override treq upon modification.Sagi Grimberg2-4/+9
Only override the allowed parts of it. Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> [hch: slight tweak to the NVME_TREQ_SECURE_CHANNEL_MASK definition] Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-07nvmet: support fabrics sq flow controlSagi Grimberg4-10/+24
Technical proposal 8005 "fabrics SQ flow control" introduces a mode where a host and controller agree to omit sq_head pointer updates when sending nvme completions. In case the host indicated desire to operate in this mode (connect attribute) the controller will return back a connect completion with sq_head value of 0xffff as indication that it will omit sq_head pointer updates. This mode saves us an atomic update in the I/O path. Reviewed-by: Hannes Reinecke <hare@suse.com> [hch: suggested better implementation] Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-07nvmet-fc: remove the IN_ISR deferred scheduling optionsJames Smart2-80/+2
All target lldd's call the cmd receive and op completions in non-isr thread contexts. As such the IN_ISR options are not necessary. Remove the functionality and flags, which also removes cpu assignments to queues. Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-07nvmet: mark nvmet_genctr staticChristoph Hellwig2-2/+1
Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-07nvmet: enable Discovery Controller AENsJay Sternberg4-12/+99
Add functions to find connections requesting Discovery Change events and send a notification to hosts that maintain an explicit persistent connection and have and active Asynchronous Event Request pending. Only Hosts that have access to the Subsystem effected by the change will receive notifications of Discovery Change event. Call these functions each time there is a configfs change that effects the Discover Log Pages. Set the OAES field in the Identify Controller response to advertise the support for Asynchronous Event Notifications. Signed-off-by: Jay Sternberg <jay.e.sternberg@intel.com> Reviewed-by: Phil Cayton <phil.cayton@intel.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-07nvmet: allow host connect even if no allowed subsystems are exportedSagi Grimberg3-30/+9
It is perfectly valid that a host connects to a discovery subsystem and gets an empty discovery log page since no subsystems are provisioned to it. No reason to disallow connecting to the discovery subsystem all together. Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Jay Sternberg <jay.e.sternberg@intel.com> Reviewed-by: Phil Cayton <phil.cayton@intel.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-07nvmet: add support to Discovery controllers for commandsJay Sternberg1-0/+53
Add custom get/set features to commands allowed by Discovery controllers. Signed-off-by: Jay Sternberg <jay.e.sternberg@intel.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-07nvmet: add defines for discovery change async eventsJay Sternberg2-0/+5
Add AEN/AER values as defined by the specification Signed-off-by: Jay Sternberg <jay.e.sternberg@intel.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-07nvmet: make kato and AEN processing for use by other controllersJay Sternberg2-15/+45
Make common process of get/set features available to other controllers by making simple functions static inline and others not static and prototypes in nvmet.h file Also remove static from nvmet_execute_async_event and add prototype to nvmet.h to allow used by other controllers Signed-off-by: Jay Sternberg <jay.e.sternberg@intel.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-07nvmet: allow Keep Alive for Discovery controllerJay Sternberg4-28/+18
Per change to specification allowing Discovery controllers to have explicit persistent connections, remove restriction on Discovery controllers allowing kato on connect. Signed-off-by: Jay Sternberg <jay.e.sternberg@intel.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-07nvmet: change aen mask functions to use bit numbersJay Sternberg4-12/+18
Functions nvmet_aen_disabled and nvmet_clear_aen were using values not bit numbers ie 1 << 9 not 9 for bit function clear_bit and test_and_set_bit. Signed-off-by: Jay Sternberg <jay.e.sternberg@intel.com> Reviewed-by: Phil Cayton <phil.cayton@intel.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-07nvmet: provide aen bit functions for multiple controller typesJay Sternberg3-20/+15
Move nvmet_aen_disabled and nvmet_clear_aen in preparation for other types of controllers to use, initially the discovery controller. Signed-off-by: Jay Sternberg <jay.e.sternberg@intel.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-07nvmet: use IOCB_NOWAIT for file-ns buffered I/OChaitanya Kulkarni1-46/+84
This patch optimizes read command behavior when file-ns configured with buffered I/O. Instead of offloading the buffered I/O read operations to the worker threads, we first issue the read operation with IOCB_NOWAIT and try and access the data from the cache. Here we only offload the request to the worker thread and complete the request in the worker thread context when IOCB_NOWAIT request fails. Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-07nvmet: support for traffic based keep-aliveSagi Grimberg3-1/+16
A controller that supports traffic based keep-alive can restart the keep alive timer even when no keep-alive was not received in the kato period as long as other admin or I/O commands were received. For each command set ctrl->cmd_seen to true, and when keep-alive timer expires, if any commands were seen, resched ka_work instead of escalating to a fatal error. Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-07nvme: support traffic based keep-aliveSagi Grimberg3-0/+15
If the controller supports traffic based keep alive, we restart the keep alive timer if any admin or io commands was completed during the kato period. This prevents a possible starvation of keep alive commands in the presence of heavy traffic as in such case, we already have a health indication from the host perspective. Only set a comp_seen indicator in case the controller supports keep alive to minimize the overhead for pci controllers. Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-07nvme: cache controller attributesSagi Grimberg2-0/+2
We get the controller attributes in identify, cache them as we'll need them for traffic based keep alive support. Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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