drm/amd/sched: add a unique job id to amd_sched_job

A unique id is useful for debugging and tracing. Intended to replace
pointers in ftrace output.

Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Andres Rodriguez <andresx7@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -460,6 +460,7 @@ int amd_sched_job_init(struct amd_sched_job *job,
 	job->sched = sched;
 	job->s_entity = entity;
 	job->s_fence = amd_sched_fence_create(entity, owner);
+	job->id = atomic64_inc_return(&sched->job_id_count);
 	if (!job->s_fence)
 		return -ENOMEM;
 
@@ -617,6 +618,7 @@ int amd_sched_init(struct amd_gpu_scheduler *sched,
 	INIT_LIST_HEAD(&sched->ring_mirror_list);
 	spin_lock_init(&sched->job_list_lock);
 	atomic_set(&sched->hw_rq_count, 0);
+	atomic64_set(&sched->job_id_count, 0);
 
 	/* Each scheduler will run on a seperate kernel thread */
 	sched->thread = kthread_run(amd_sched_main, sched, sched->name);

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

@@ -80,6 +80,7 @@ struct amd_sched_job {
 	struct work_struct		finish_work;
 	struct list_head		node;
 	struct delayed_work		work_tdr;
+	uint64_t			id;
 };
 
 extern const struct dma_fence_ops amd_sched_fence_ops_scheduled;
@@ -124,6 +125,7 @@ struct amd_gpu_scheduler {
 	wait_queue_head_t		wake_up_worker;
 	wait_queue_head_t		job_scheduled;
 	atomic_t			hw_rq_count;
+	atomic64_t			job_id_count;
 	struct task_struct		*thread;
 	struct list_head	ring_mirror_list;
 	spinlock_t			job_list_lock;