-----Original Message-----
From: dri-devel <dri-devel-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of Andrey Grodzovsky
Sent: Friday, August 17, 2018 11:16 PM
To: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: Koenig, Christian <Christian.Koenig@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Subject: [PATCH] drm/scheduler: Add stopped flag to drm_sched_entity
The flag will prevent another thread from same process to reinsert the entity queue into scheduler's rq after it was already removed from there by another thread during drm_sched_entity_flush.
Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@xxxxxxx>
---
drivers/gpu/drm/scheduler/sched_entity.c | 10 +++++++++-
include/drm/gpu_scheduler.h | 2 ++
2 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c
index 1416edb..07cfe63 100644
--- a/drivers/gpu/drm/scheduler/sched_entity.c
+++ b/drivers/gpu/drm/scheduler/sched_entity.c
@@ -177,8 +177,12 @@ long drm_sched_entity_flush(struct drm_sched_entity *entity, long timeout)
/* For killed process disable any more IBs enqueue right now */
last_user = cmpxchg(&entity->last_user, current->group_leader, NULL);
if ((!last_user || last_user == current->group_leader) &&
- (current->flags & PF_EXITING) && (current->exit_code == SIGKILL))
+ (current->flags & PF_EXITING) && (current->exit_code == SIGKILL)) {
+ spin_lock(&entity->rq_lock);
+ entity->stopped = true;
drm_sched_rq_remove_entity(entity->rq, entity);
+ spin_unlock(&entity->rq_lock);
+ }
return ret;
}
@@ -504,6 +508,10 @@ void drm_sched_entity_push_job(struct drm_sched_job *sched_job,
if (first) {
/* Add the entity to the run queue */
spin_lock(&entity->rq_lock);
+ if (entity->stopped) {
+ spin_unlock(&entity->rq_lock);
+ return;
+ }
[DZ] the code changes so frequent recently and has this regression, my code synced last Friday still has below checking:
spin_lock(&entity->rq_lock);
if (!entity->rq) {
DRM_ERROR("Trying to push to a killed entity\n");
spin_unlock(&entity->rq_lock);
return;
}
So you should add DRM_ERROR as well when hitting it.
With that fix, patch is Reviewed-by: Chunming Zhou <david1.zhou@xxxxxxx>
Regards,
David Zhou
drm_sched_rq_add_entity(entity->rq, entity);
spin_unlock(&entity->rq_lock);
drm_sched_wakeup(entity->rq->sched);
diff --git a/include/drm/gpu_scheduler.h b/include/drm/gpu_scheduler.h index 919ae57..daec50f 100644
--- a/include/drm/gpu_scheduler.h
+++ b/include/drm/gpu_scheduler.h
@@ -70,6 +70,7 @@ enum drm_sched_priority {
* @fini_status: contains the exit status in case the process was signalled.
* @last_scheduled: points to the finished fence of the last scheduled job.
* @last_user: last group leader pushing a job into the entity.
+ * @stopped: Marks the enity as removed from rq and destined for termination.
*
* Entities will emit jobs in order to their corresponding hardware
* ring, and the scheduler will alternate between entities based on @@ -92,6 +93,7 @@ struct drm_sched_entity {
atomic_t *guilty;
struct dma_fence *last_scheduled;
struct task_struct *last_user;
+ bool stopped;
};
/**
--
2.7.4
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