drm/amdgpu: more scheduler cleanups v2

Embed the scheduler into the ring structure instead of allocating it.
Use the ring name directly instead of the id.

v2: rebased, whitespace cleanup

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com>
Reviewed-by: Chunming Zhou<david1.zhou@amd.com>

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

@@ -16,21 +16,21 @@ TRACE_EVENT(amd_sched_job,
 	    TP_ARGS(sched_job),
 	    TP_STRUCT__entry(
 			     __field(struct amd_sched_entity *, entity)
-			     __field(u32, ring_id)
+			     __field(const char *, name)
 			     __field(u32, job_count)
 			     __field(int, hw_job_count)
 			     ),
 
 	    TP_fast_assign(
 			   __entry->entity = sched_job->s_entity;
-			   __entry->ring_id = sched_job->sched->ring_id;
+			   __entry->name = sched_job->sched->name;
 			   __entry->job_count = kfifo_len(
 				   &sched_job->s_entity->job_queue) / sizeof(sched_job);
 			   __entry->hw_job_count = atomic_read(
 				   &sched_job->sched->hw_rq_count);
 			   ),
-	    TP_printk("entity=%p, ring=%u, job count:%u, hw job count:%d",
-		      __entry->entity, __entry->ring_id, __entry->job_count,
+	    TP_printk("entity=%p, ring=%s, job count:%u, hw job count:%d",
+		      __entry->entity, __entry->name, __entry->job_count,
 		      __entry->hw_job_count)
 );
 #endif

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

@@ -381,56 +381,45 @@ static int amd_sched_main(void *param)
 }
 
 /**
- * Create a gpu scheduler
+ * Init a gpu scheduler instance
  *
+ * @sched		The pointer to the scheduler
  * @ops			The backend operations for this scheduler.
- * @ring		The the ring id for the scheduler.
  * @hw_submissions	Number of hw submissions to do.
+ * @name		Name used for debugging
  *
- * Return the pointer to scheduler for success, otherwise return NULL
+ * Return 0 on success, otherwise error code.
 */
-struct amd_gpu_scheduler *amd_sched_create(struct amd_sched_backend_ops *ops,
-					   unsigned ring, unsigned hw_submission,
-					   void *priv)
+int amd_sched_init(struct amd_gpu_scheduler *sched,
+		   struct amd_sched_backend_ops *ops,
+		   unsigned hw_submission, const char *name)
 {
-	struct amd_gpu_scheduler *sched;
-
-	sched = kzalloc(sizeof(struct amd_gpu_scheduler), GFP_KERNEL);
-	if (!sched)
-		return NULL;
-
 	sched->ops = ops;
-	sched->ring_id = ring;
 	sched->hw_submission_limit = hw_submission;
-	sched->priv = priv;
-	snprintf(sched->name, sizeof(sched->name), "amdgpu[%d]", ring);
+	sched->name = name;
 	amd_sched_rq_init(&sched->sched_rq);
 	amd_sched_rq_init(&sched->kernel_rq);
 
 	init_waitqueue_head(&sched->wake_up_worker);
 	init_waitqueue_head(&sched->job_scheduled);
 	atomic_set(&sched->hw_rq_count, 0);
+
 	/* Each scheduler will run on a seperate kernel thread */
 	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);
-		return NULL;
+		DRM_ERROR("Failed to create scheduler for %s.\n", name);
+		return PTR_ERR(sched->thread);
 	}
 
-	return sched;
+	return 0;
 }
 
 /**
  * Destroy a gpu scheduler
  *
  * @sched	The pointer to the scheduler
- *
- * return 0 if succeed. -1 if failed.
  */
-int amd_sched_destroy(struct amd_gpu_scheduler *sched)
+void amd_sched_fini(struct amd_gpu_scheduler *sched)
 {
 	kthread_stop(sched->thread);
-	kfree(sched);
-	return  0;
 }

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

@@ -101,23 +101,21 @@ struct amd_sched_backend_ops {
  * One scheduler is implemented for each hardware ring
 */
 struct amd_gpu_scheduler {
-	struct task_struct		*thread;
+	struct amd_sched_backend_ops	*ops;
+	uint32_t			hw_submission_limit;
+	const char			*name;
 	struct amd_sched_rq		sched_rq;
 	struct amd_sched_rq		kernel_rq;
-	atomic_t			hw_rq_count;
-	struct amd_sched_backend_ops	*ops;
-	uint32_t			ring_id;
 	wait_queue_head_t		wake_up_worker;
 	wait_queue_head_t		job_scheduled;
-	uint32_t                        hw_submission_limit;
-	char                            name[20];
-	void                            *priv;
+	atomic_t			hw_rq_count;
+	struct task_struct		*thread;
 };
 
-struct amd_gpu_scheduler *
-amd_sched_create(struct amd_sched_backend_ops *ops,
-		 uint32_t ring, uint32_t hw_submission, void *priv);
-int amd_sched_destroy(struct amd_gpu_scheduler *sched);
+int amd_sched_init(struct amd_gpu_scheduler *sched,
+		   struct amd_sched_backend_ops *ops,
+		   uint32_t hw_submission, const char *name);
+void amd_sched_fini(struct amd_gpu_scheduler *sched);
 
 int amd_sched_entity_init(struct amd_gpu_scheduler *sched,
 			  struct amd_sched_entity *entity,