linux/drivers/tee/optee
Rouven Czerwinski 9f02b8f61f tee: optee: add might_sleep for RPC requests
If the kernel is compiled with CONFIG_PREEMPT_VOLUNTARY and OP-TEE is
executing a long running workload, the following errors are raised:

[ 1705.971228] rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
[ 1705.977195] rcu:     (detected by 0, t=2102 jiffies, g=51977, q=3)
[ 1705.983152] rcu: All QSes seen, last rcu_sched kthread activity 2102 (140596-138494), jiffies_till_next_fqs=1, root ->qsmask 0x0
[ 1705.994729] optee-xtest     R  running task        0   169    157 0x00000002

While OP-TEE is returning regularly to the kernel due to timer
interrupts, the OPTEE_SMC_FUNC_FOREIGN_INTR case does not contain an
explicit rescheduling point. Add a might_sleep() to the RPC request case
to ensure that the kernel can reschedule another task if OP-TEE requests
RPC handling.

Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
2019-07-08 22:38:56 +02:00
..
call.c tee: optee: add might_sleep for RPC requests 2019-07-08 22:38:56 +02:00
core.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
device.c tee: optee: Fix unsigned comparison with less than zero 2019-02-20 17:57:47 +01:00
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile tee: optee: add TEE bus device enumeration support 2019-02-01 15:12:46 +01:00
optee_msg.h tee: optee: update optee_msg.h and optee_smc.h to dual license 2019-02-28 13:49:29 +01:00
optee_private.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
optee_smc.h tee: optee: update optee_msg.h and optee_smc.h to dual license 2019-02-28 13:49:29 +01:00
rpc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
shm_pool.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
shm_pool.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
supp.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00