[PATCH] Revert "drm/scheduler: improve job distribution with multiple queues"

[Liu, Aaron]

[AMD Official Use Only - Approved for External Use]

Acked-by: Aaron Liu <aaron.liu at amd.com>

--
Best Regards
Aaron Liu

-----Original Message-----
From: Zhu, Changfeng <Changfeng.Zhu at amd.com> 
Sent: Friday, October 9, 2020 2:17 PM
To: amd-gfx at lists.freedesktop.org; Liu, Aaron <Aaron.Liu at amd.com>
Cc: Zhu, Changfeng <Changfeng.Zhu at amd.com>
Subject: [PATCH] Revert "drm/scheduler: improve job distribution with multiple queues"

From: changzhu <Changfeng.Zhu at amd.com>

From: Changfeng <Changfeng.Zhu at amd.com>

It needs to revert this patch to avoid amdgpu_test compute hang problem on picasso/raven1

Change-Id: I5c298bb0c6cd64c67de712db551d15974c41493e
Signed-off-by: Changfeng <Changfeng.Zhu at amd.com>
---
 drivers/gpu/drm/scheduler/sched_entity.c |  2 +-
 drivers/gpu/drm/scheduler/sched_main.c   | 14 ++++++--------
 include/drm/gpu_scheduler.h              |  6 +++---
 3 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c
index 146380118962..c803e14eed91 100644
--- a/drivers/gpu/drm/scheduler/sched_entity.c
+++ b/drivers/gpu/drm/scheduler/sched_entity.c
@@ -486,7 +486,7 @@ void drm_sched_entity_push_job(struct drm_sched_job *sched_job,
 	bool first;
 
 	trace_drm_sched_job(sched_job, entity);
-	atomic_inc(&entity->rq->sched->score);
+	atomic_inc(&entity->rq->sched->num_jobs);
 	WRITE_ONCE(entity->last_user, current->group_leader);
 	first = spsc_queue_push(&entity->job_queue, &sched_job->queue_node);
 
diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
index 9a0d77a68018..851443a19ee0 100644
--- a/drivers/gpu/drm/scheduler/sched_main.c
+++ b/drivers/gpu/drm/scheduler/sched_main.c
@@ -92,7 +92,6 @@ void drm_sched_rq_add_entity(struct drm_sched_rq *rq,
 	if (!list_empty(&entity->list))
 		return;
 	spin_lock(&rq->lock);
-	atomic_inc(&rq->sched->score);
 	list_add_tail(&entity->list, &rq->entities);
 	spin_unlock(&rq->lock);
 }
@@ -111,7 +110,6 @@ void drm_sched_rq_remove_entity(struct drm_sched_rq *rq,
 	if (list_empty(&entity->list))
 		return;
 	spin_lock(&rq->lock);
-	atomic_dec(&rq->sched->score);
 	list_del_init(&entity->list);
 	if (rq->current_entity == entity)
 		rq->current_entity = NULL;
@@ -649,7 +647,7 @@ static void drm_sched_process_job(struct dma_fence *f, struct dma_fence_cb *cb)
 	struct drm_gpu_scheduler *sched = s_fence->sched;
 
 	atomic_dec(&sched->hw_rq_count);
-	atomic_dec(&sched->score);
+	atomic_dec(&sched->num_jobs);
 
 	trace_drm_sched_process_job(s_fence);
 
@@ -714,7 +712,7 @@ drm_sched_pick_best(struct drm_gpu_scheduler **sched_list,  {
 	struct drm_gpu_scheduler *sched, *picked_sched = NULL;
 	int i;
-	unsigned int min_score = UINT_MAX, num_score;
+	unsigned int min_jobs = UINT_MAX, num_jobs;
 
 	for (i = 0; i < num_sched_list; ++i) {
 		sched = sched_list[i];
@@ -725,9 +723,9 @@ drm_sched_pick_best(struct drm_gpu_scheduler **sched_list,
 			continue;
 		}
 
-		num_score = atomic_read(&sched->score);
-		if (num_score < min_score) {
-			min_score = num_score;
+		num_jobs = atomic_read(&sched->num_jobs);
+		if (num_jobs < min_jobs) {
+			min_jobs = num_jobs;
 			picked_sched = sched;
 		}
 	}
@@ -861,7 +859,7 @@ int drm_sched_init(struct drm_gpu_scheduler *sched,
 	spin_lock_init(&sched->job_list_lock);
 	atomic_set(&sched->hw_rq_count, 0);
 	INIT_DELAYED_WORK(&sched->work_tdr, drm_sched_job_timedout);
-	atomic_set(&sched->score, 0);
+	atomic_set(&sched->num_jobs, 0);
 	atomic64_set(&sched->job_id_count, 0);
 
 	/* Each scheduler will run on a seperate kernel thread */ diff --git a/include/drm/gpu_scheduler.h b/include/drm/gpu_scheduler.h index 92436553fd6a..a33590e62108 100644
--- a/include/drm/gpu_scheduler.h
+++ b/include/drm/gpu_scheduler.h
@@ -264,7 +264,7 @@ struct drm_sched_backend_ops {
  * @job_list_lock: lock to protect the ring_mirror_list.
  * @hang_limit: once the hangs by a job crosses this limit then it is marked
  *              guilty and it will be considered for scheduling further.
- * @score: score to help loadbalancer pick a idle sched
+ * @num_jobs: the number of jobs in queue in the scheduler
  * @ready: marks if the underlying HW is ready to work
  * @free_guilty: A hit to time out handler to free the guilty job.
  *
@@ -285,8 +285,8 @@ struct drm_gpu_scheduler {
 	struct list_head		ring_mirror_list;
 	spinlock_t			job_list_lock;
 	int				hang_limit;
-	atomic_t                        score;
-	bool				ready;
+	atomic_t                        num_jobs;
+	bool			ready;
 	bool				free_guilty;
 };
 
--
2.17.1