linux/drivers/crypto/hisilicon
Longfang Liu 33fc506d2a crypto: hisilicon/qm - prevent soft lockup in receive loop
In the scenario where the accelerator business is fully loaded.
When the workqueue receiving messages and performing callback
processing, there are a large number of messages that need to be
received, and there are continuously messages that have been
processed and need to be received.
This will cause the receive loop here to be locked for a long time.
This scenario will cause watchdog timeout problems on OS with kernel
preemption turned off.

The error logs:
watchdog: BUG: soft lockup - CPU#23 stuck for 23s! [kworker/u262:1:1407]
[ 1461.978428][   C23] Call trace:
[ 1461.981890][   C23]  complete+0x8c/0xf0
[ 1461.986031][   C23]  kcryptd_async_done+0x154/0x1f4 [dm_crypt]
[ 1461.992154][   C23]  sec_skcipher_callback+0x7c/0xf4 [hisi_sec2]
[ 1461.998446][   C23]  sec_req_cb+0x104/0x1f4 [hisi_sec2]
[ 1462.003950][   C23]  qm_poll_req_cb+0xcc/0x150 [hisi_qm]
[ 1462.009531][   C23]  qm_work_process+0x60/0xc0 [hisi_qm]
[ 1462.015101][   C23]  process_one_work+0x1c4/0x470
[ 1462.020052][   C23]  worker_thread+0x150/0x3c4
[ 1462.024735][   C23]  kthread+0x108/0x13c
[ 1462.028889][   C23]  ret_from_fork+0x10/0x18

Therefore, it is necessary to add an actively scheduled operation in the
while loop to prevent this problem.
After adding it, no matter whether the OS turns on or off the kernel
preemption function. Neither will cause watchdog timeout issues.

Signed-off-by: Longfang Liu <liulongfang@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2023-10-27 18:04:27 +08:00
..
hpre crypto: hisilicon/qm - check function qp num before alg register 2023-10-05 18:16:31 +08:00
sec crypto: hisilicon/sec - Convert to platform remove callback returning void 2023-10-27 18:04:26 +08:00
sec2 crypto: hisilicon/qm - check function qp num before alg register 2023-10-05 18:16:31 +08:00
trng crypto: hisilicon/trng - Convert to platform remove callback returning void 2023-10-27 18:04:26 +08:00
zip crypto: hisilicon/qm - check function qp num before alg register 2023-10-05 18:16:31 +08:00
debugfs.c crypto: hisilicon/qm - alloc buffer to set and get xqc 2023-10-14 12:05:39 +08:00
Kconfig hwrng: histb - Move driver to drivers/char/hw_random/histb-rng.c 2023-05-12 18:48:01 +08:00
Makefile hwrng: histb - Move driver to drivers/char/hw_random/histb-rng.c 2023-05-12 18:48:01 +08:00
qm_common.h crypto: hisilicon/qm - alloc buffer to set and get xqc 2023-10-14 12:05:39 +08:00
qm.c crypto: hisilicon/qm - prevent soft lockup in receive loop 2023-10-27 18:04:27 +08:00
sgl.c mm, treewide: redefine MAX_ORDER sanely 2023-04-05 19:42:46 -07:00