drm/amdgpu: remove entity reference from sched fence

Entity don't live as long as scheduler fences.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_sa.c

@@ -146,7 +146,7 @@ static uint32_t amdgpu_sa_get_ring_from_fence(struct fence *f)
 
 	s_fence = to_amd_sched_fence(f);
 	if (s_fence)
-		return s_fence->entity->scheduler->ring_id;
+		return s_fence->scheduler->ring_id;
 	a_fence = to_amdgpu_fence(f);
 	if (a_fence)
 		return a_fence->ring->idx;
@@ -437,7 +437,7 @@ void amdgpu_sa_bo_dump_debug_info(struct amdgpu_sa_manager *sa_manager,
 			if (s_fence)
 				seq_printf(m, " protected by 0x%016x on ring %d",
 					   s_fence->base.seqno,
-					   s_fence->entity->scheduler->ring_id);
+					   s_fence->scheduler->ring_id);
 
 		}
 		seq_printf(m, "\n");

drivers/gpu/drm/amd/scheduler/gpu_scheduler.c

@@ -109,8 +109,6 @@ int amd_sched_entity_init(struct amd_gpu_scheduler *sched,
 			  struct amd_sched_rq *rq,
 			  uint32_t jobs)
 {
-	char name[20];
-
 	if (!(sched && entity && rq))
 		return -EINVAL;
 
@@ -119,8 +117,6 @@ int amd_sched_entity_init(struct amd_gpu_scheduler *sched,
 	entity->scheduler = sched;
 	init_waitqueue_head(&entity->wait_queue);
 	entity->fence_context = fence_context_alloc(1);
-	snprintf(name, sizeof(name), "c_entity[%llu]", entity->fence_context);
-	memcpy(entity->name, name, 20);
 	if(kfifo_alloc(&entity->job_queue,
 		       jobs * sizeof(void *),
 		       GFP_KERNEL))
@@ -347,7 +343,6 @@ struct amd_gpu_scheduler *amd_sched_create(struct amd_sched_backend_ops *ops,
 					   unsigned ring, unsigned hw_submission)
 {
 	struct amd_gpu_scheduler *sched;
-	char name[20];
 
 	sched = kzalloc(sizeof(struct amd_gpu_scheduler), GFP_KERNEL);
 	if (!sched)
@@ -356,14 +351,14 @@ struct amd_gpu_scheduler *amd_sched_create(struct amd_sched_backend_ops *ops,
 	sched->ops = ops;
 	sched->ring_id = ring;
 	sched->hw_submission_limit = hw_submission;
-	snprintf(name, sizeof(name), "gpu_sched[%d]", ring);
+	snprintf(sched->name, sizeof(sched->name), "amdgpu[%d]", ring);
 	amd_sched_rq_init(&sched->sched_rq);
 	amd_sched_rq_init(&sched->kernel_rq);
 
 	init_waitqueue_head(&sched->wait_queue);
 	atomic_set(&sched->hw_rq_count, 0);
 	/* Each scheduler will run on a seperate kernel thread */
-	sched->thread = kthread_run(amd_sched_main, sched, name);
+	sched->thread = kthread_run(amd_sched_main, sched, sched->name);
 	if (IS_ERR(sched->thread)) {
 		DRM_ERROR("Failed to create scheduler for id %d.\n", ring);
 		kfree(sched);

drivers/gpu/drm/amd/scheduler/gpu_scheduler.h

@@ -48,7 +48,6 @@ struct amd_sched_entity {
 	struct amd_gpu_scheduler	*scheduler;
 	wait_queue_head_t		wait_queue;
 	uint64_t                        fence_context;
-	char                            name[20];
 };
 
 /**
@@ -64,8 +63,7 @@ struct amd_sched_rq {
 
 struct amd_sched_fence {
 	struct fence                    base;
-	struct fence_cb                 cb;
-	struct amd_sched_entity	        *entity;
+	struct amd_gpu_scheduler	*scheduler;
 	spinlock_t			lock;
 };
 
@@ -111,6 +109,7 @@ struct amd_gpu_scheduler {
 	uint32_t			ring_id;
 	wait_queue_head_t		wait_queue;
 	uint32_t                        hw_submission_limit;
+	char                            name[20];
 };
 
 struct amd_gpu_scheduler *

drivers/gpu/drm/amd/scheduler/sched_fence.c

@@ -36,7 +36,7 @@ struct amd_sched_fence *amd_sched_fence_create(struct amd_sched_entity *s_entity
 	if (fence == NULL)
 		return NULL;
 
-	fence->entity = s_entity;
+	fence->scheduler = s_entity->scheduler;
 	spin_lock_init(&fence->lock);
 
 	seq = atomic_inc_return(&s_entity->fence_seq);
@@ -63,7 +63,7 @@ static const char *amd_sched_fence_get_driver_name(struct fence *fence)
 static const char *amd_sched_fence_get_timeline_name(struct fence *f)
 {
 	struct amd_sched_fence *fence = to_amd_sched_fence(f);
-	return (const char *)fence->entity->name;
+	return (const char *)fence->scheduler->name;
 }
 
 static bool amd_sched_fence_enable_signaling(struct fence *f)