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drm/sched: Optimise drm_sched_entity_push_job

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In FIFO mode (which is the default), both drm_sched_entity_push_job() and
drm_sched_rq_update_fifo(), where the latter calls the former, are
currently taking and releasing the same entity->rq_lock.

We can avoid that design inelegance, and also have a miniscule
efficiency improvement on the submit from idle path, by introducing a new
drm_sched_rq_update_fifo_locked() helper and pulling up the lock taking to
its callers.

v2:
 * Remove drm_sched_rq_update_fifo() altogether. (Christian)

v3:
 * Improved commit message. (Philipp)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Luben Tuikov <ltuikov89@gmail.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Philipp Stanner <pstanner@redhat.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Philipp Stanner <pstanner@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241016122013.7857-2-tursulin@igalia.com
This commit is contained in:
Tvrtko Ursulin
2024-10-16 13:20:09 +01:00
committed by Philipp Stanner
parent fd3b2c5f40
commit d42a254633
3 changed files with 13 additions and 8 deletions
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13
drivers/gpu/drm/scheduler/sched_entity.c
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@@ -514,8 +514,12 @@ struct drm_sched_job *drm_sched_entity_pop_job(struct drm_sched_entity *entity)
struct drm_sched_job *next;
next = to_drm_sched_job(spsc_queue_peek(&entity->job_queue));
if (next)
drm_sched_rq_update_fifo(entity, next->submit_ts);
if (next) {
spin_lock(&entity->rq_lock);
drm_sched_rq_update_fifo_locked(entity,
next->submit_ts);
spin_unlock(&entity->rq_lock);
}
}
/* Jobs and entities might have different lifecycles. Since we're
@@ -613,10 +617,11 @@ void drm_sched_entity_push_job(struct drm_sched_job *sched_job)
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_rq_update_fifo_locked(entity, submit_ts);
spin_unlock(&entity->rq_lock);
drm_sched_wakeup(sched);
}