drm/scheduler: add counter for total jobs in scheduler

To keep track of the scheduler load.
Signed-off-by: Nayan Deshmukh <nayan26deshmukh@gmail.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/scheduler/gpu_scheduler.c

@@ -530,6 +530,7 @@ void drm_sched_entity_push_job(struct drm_sched_job *sched_job,
 
 	trace_drm_sched_job(sched_job, entity);
 
+	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);
 
@@ -821,6 +822,7 @@ static void drm_sched_process_job(struct dma_fence *f, struct dma_fence_cb *cb)
 
 	dma_fence_get(&s_fence->finished);
 	atomic_dec(&sched->hw_rq_count);
+	atomic_dec(&sched->num_jobs);
 	drm_sched_fence_finished(s_fence);
 
 	trace_drm_sched_process_job(s_fence);
@@ -938,6 +940,7 @@ int drm_sched_init(struct drm_gpu_scheduler *sched,
 	INIT_LIST_HEAD(&sched->ring_mirror_list);
 	spin_lock_init(&sched->job_list_lock);
 	atomic_set(&sched->hw_rq_count, 0);
+	atomic_set(&sched->num_jobs, 0);
 	atomic64_set(&sched->job_id_count, 0);
 
 	/* Each scheduler will run on a seperate kernel thread */

include/drm/gpu_scheduler.h

@@ -262,6 +262,7 @@ 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.
+ * @num_jobs: the number of jobs in queue in the scheduler
  *
  * One scheduler is implemented for each hardware ring.
  */
@@ -279,6 +280,7 @@ struct drm_gpu_scheduler {
 	struct list_head		ring_mirror_list;
 	spinlock_t			job_list_lock;
 	int				hang_limit;
+	atomic_t                        num_jobs;
 };
 
 int drm_sched_init(struct drm_gpu_scheduler *sched,