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authorEric Anholt <eric@anholt.net>2018-12-07 11:16:53 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-02-20 10:29:16 +0100
commit02edc9fd969fda27dad1c3f52aef68205428beb2 (patch)
parent0887f86fd20d1aae062fb46942f97c5fccc00e6b (diff)
drm/sched: Always trace the dependencies we wait on, to fix a race.
commit 82abf33766712d8446ea137a3400165e31bd12c7 upstream. The entity->dependency can go away completely once we've called drm_sched_entity_add_dependency_cb() (if the cb is called before we get around to tracing). The tracepoint is more useful if we trace every dependency instead of just ones that get callbacks installed, anyway, so just do that. Fixes any easy-to-produce OOPS when tracing the scheduler on V3D with "perf record -a -e gpu_scheduler:.\* glxgears" and DEBUG_SLAB enabled. Signed-off-by: Eric Anholt <eric@anholt.net> Reviewed-by: Christian K├Ânig <christian.koenig@amd.com> Cc: stable@vger.kernel.org Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 files changed, 2 insertions, 5 deletions
diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c
index 3e22a54a99c2..2c02f5b03db8 100644
--- a/drivers/gpu/drm/scheduler/sched_entity.c
+++ b/drivers/gpu/drm/scheduler/sched_entity.c
@@ -434,13 +434,10 @@ struct drm_sched_job *drm_sched_entity_pop_job(struct drm_sched_entity *entity)
while ((entity->dependency =
sched->ops->dependency(sched_job, entity))) {
+ trace_drm_sched_job_wait_dep(sched_job, entity->dependency);
- if (drm_sched_entity_add_dependency_cb(entity)) {
- trace_drm_sched_job_wait_dep(sched_job,
- entity->dependency);
+ if (drm_sched_entity_add_dependency_cb(entity))
return NULL;
- }
/* skip jobs from entity that marked guilty */