This is a note to let you know that I've just added the patch titled
drm/sched: Always wake up correct scheduler in
drm_sched_entity_push_job
to the 6.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-sched-always-wake-up-correct-scheduler-in-drm_sched_entity_push_job.patch
and it can be found in the queue-6.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
From cbc8764e29c2318229261a679b2aafd0f9072885 Mon Sep 17 00:00:00 2001
From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxx>
Date: Tue, 24 Sep 2024 11:19:08 +0100
Subject: drm/sched: Always wake up correct scheduler in
drm_sched_entity_push_job
MIME-Version: 1.0
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From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxx>
commit cbc8764e29c2318229261a679b2aafd0f9072885 upstream.
Since drm_sched_entity_modify_sched() can modify the entities run queue,
lets make sure to only dereference the pointer once so both adding and
waking up are guaranteed to be consistent.
Alternative of moving the spin_unlock to after the wake up would for now
be more problematic since the same lock is taken inside
drm_sched_rq_update_fifo().
v2:
* Improve commit message. (Philipp)
* Cache the scheduler pointer directly. (Christian)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxx>
Fixes: b37aced31eb0 ("drm/scheduler: implement a function to modify
sched list")
Cc: Christian König <christian.koenig@xxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: Luben Tuikov <ltuikov89@xxxxxxxxx>
Cc: Matthew Brost <matthew.brost@xxxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Cc: Philipp Stanner <pstanner@xxxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: <stable@xxxxxxxxxxxxxxx> # v5.7+
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Link:
https://patchwork.freedesktop.org/patch/msgid/20240924101914.2713-3-tursulin@xxxxxxxxxx
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/scheduler/sched_entity.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/scheduler/sched_entity.c
+++ b/drivers/gpu/drm/scheduler/sched_entity.c
@@ -599,6 +599,9 @@ void drm_sched_entity_push_job(struct dr
/* first job wakes up scheduler */
if (first) {
+ struct drm_gpu_scheduler *sched;
+ struct drm_sched_rq *rq;
+
/* Add the entity to the run queue */
spin_lock(&entity->rq_lock);
if (entity->stopped) {
@@ -608,13 +611,16 @@ void drm_sched_entity_push_job(struct dr
return;
}
- drm_sched_rq_add_entity(entity->rq, entity);
+ rq = entity->rq;
+ sched = rq->sched;
+
+ drm_sched_rq_add_entity(rq, entity);
spin_unlock(&entity->rq_lock);
if (drm_sched_policy == DRM_SCHED_POLICY_FIFO)
drm_sched_rq_update_fifo(entity, submit_ts);
- drm_sched_wakeup(entity->rq->sched);
+ drm_sched_wakeup(sched);
}
}
EXPORT_SYMBOL(drm_sched_entity_push_job);
Patches currently in stable-queue which might be from
tvrtko.ursulin@xxxxxxxxxx are
queue-6.10/drm-sched-always-increment-correct-scheduler-score.patch
queue-6.10/drm-v3d-prevent-out-of-bounds-access-in-performance-query-extensions.patch
queue-6.10/drm-sched-always-wake-up-correct-scheduler-in-drm_sched_entity_push_job.patch
queue-6.10/drm-sched-add-locking-to-drm_sched_entity_modify_sched.patch
