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SubjectRe: ufshcd_queuecommand() triggering after ufshcd_suspend()?
Date
+Zang

Thanks,
Avri



________________________________________
From: John Stultz <john.stultz@linaro.org>
Sent: Friday, January 11, 2019 1:02:21 AM
To: Sahitya Tummala; Christoph Hellwig; Wei Li; Martin K. Petersen
Cc: Evan Green; Avri Altman; Vijay Viswanath; lkml; linux-scsi@vger.kernel.org
Subject: ufshcd_queuecommand() triggering after ufshcd_suspend()?

Hey all,
Frequently, since support for the HiKey960's UFS code landed in
4.19, I've noticed the following warning on reboot:

[ 23.086860] WARNING: CPU: 0 PID: 2507 at
drivers/scsi/ufs/ufshcd.c:2460 ufshcd_queuecommand+0x59c/0x5a8
[ 23.096256] Modules linked in:
[ 23.099313] CPU: 0 PID: 2507 Comm: kworker/0:1H Tainted: G S
5.0.0-rc1-00068-g3f81a19 #273
[ 23.108873] Hardware name: HiKey960 (DT)
[ 23.112802] Workqueue: kblockd blk_mq_requeue_work
[ 23.117591] pstate: 80400005 (Nzcv daif +PAN -UAO)
[ 23.122378] pc : ufshcd_queuecommand+0x59c/0x5a8
[ 23.126990] lr : ufshcd_queuecommand+0x58c/0x5a8
[ 23.131600] sp : ffffff8015e1ba80
[ 23.134907] x29: ffffff8015e1ba80 x28: ffffffc217f94048
[ 23.140214] x27: 0000000000000010 x26: ffffffc217a7c8b8
[ 23.145520] x25: ffffffc217a7c000 x24: ffffffc217a7ceb0
[ 23.150827] x23: 0000000000000000 x22: ffffffc217a7c808
[ 23.156133] x21: ffffffc217f94120 x20: 0000000000000010
[ 23.161440] x19: ffffff801186d000 x18: ffffff801186db08
[ 23.166746] x17: 0000000000000000 x16: 0000000000000000
[ 23.172053] x15: ffffff8095e1b7c7 x14: 692064616574736e
[ 23.177360] x13: 6928204e4f5f534b x12: 4c43203d21206574
[ 23.182666] x11: 6174732e676e6974 x10: 61675f6b6c633e2d
[ 23.187973] x9 : 61626820646e616d x8 : 6d6f636575657571
[ 23.193280] x7 : 0000000000000000 x6 : ffffff801186e000
[ 23.198586] x5 : ffffff801186e270 x4 : ffffff8010096dc0
[ 23.203894] x3 : 0000000000010000 x2 : 47dd99afde511d00
[ 23.209201] x1 : 0000000000000000 x0 : 0000000000000000
[ 23.214509] Call trace:
[ 23.216952] ufshcd_queuecommand+0x59c/0x5a8
[ 23.221220] scsi_queue_rq+0x5b4/0x880
[ 23.224964] blk_mq_dispatch_rq_list+0xb0/0x510
[ 23.229492] blk_mq_sched_dispatch_requests+0xf4/0x198
[ 23.234626] __blk_mq_run_hw_queue+0xb4/0x120
[ 23.238978] __blk_mq_delay_run_hw_queue+0x110/0x200
[ 23.243937] blk_mq_run_hw_queue+0xb8/0x118
[ 23.248114] blk_mq_run_hw_queues+0x58/0x78
[ 23.252291] blk_mq_requeue_work+0x140/0x168
[ 23.256560] process_one_work+0x158/0x468
[ 23.260564] worker_thread+0x50/0x460
[ 23.264222] kthread+0x104/0x130
[ 23.267447] ret_from_fork+0x10/0x1c
[ 23.271017] ---[ end trace 45f1ee04059cdf00 ]---

Since the warning is triggering from the WARN_ON(hba->clk_gating.state
!= CLKS_ON) line, I annotated the clk_gating.state changes, and am
seeing on reboot:
vdc: Waited 0ms for vold
sd 0:0:0:3: [sdd] Synchronizing SCSI cache
sd 0:0:0:2: [sdc] Synchronizing SCSI cache
sd 0:0:0:1: [sdb] Synchronizing SCSI cache
sd 0:0:0:0: [sda] Synchronizing SCSI cache
ufshcd_suspend: setting clk_gating.state CLKS_OFF
ufshcd_queuecommand hba->clk_gating.state != CLKS_ON (instead its 0)
<warning splat>

So it seems like ufshcd_suspend() is has run, but then the workqueue
(occasionally) fires afterwards triggering the issue.

Maybe should something in ufshcd_queuecommand be checking the
clk_gating.is_suspended flag before proceeding?

Other ideas? The logic all seems to be in the generic code, but I'm
not sure if maybe the ufs-hisi.c code is mis-managing something?

thanks
-john

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