drm/amdgpu:add hang_limit for sched(v2)

since gpu_scheduler source domain cannot access amdgpu variable
so need create the hang_limit membewr for sched, and it can
refer it for the upcoming GPU RESET patches

v2:
make hang_limit a parameter of sched_init()
Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Chunming Zhou <David1.Zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -446,7 +446,7 @@ int amdgpu_fence_driver_init_ring(struct amdgpu_ring *ring,
 			timeout = MAX_SCHEDULE_TIMEOUT;
 		}
 		r = amd_sched_init(&ring->sched, &amdgpu_sched_ops,
-				   num_hw_submission,
+				   num_hw_submission, amdgpu_job_hang_limit,
 				   timeout, ring->name);
 		if (r) {
 			DRM_ERROR("Failed to create scheduler on ring %s.\n",

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

@@ -676,13 +676,17 @@ static int amd_sched_main(void *param)
 */
 int amd_sched_init(struct amd_gpu_scheduler *sched,
 		   const struct amd_sched_backend_ops *ops,
-		   unsigned hw_submission, long timeout, const char *name)
+		   unsigned hw_submission,
+		   unsigned hang_limit,
+		   long timeout,
+		   const char *name)
 {
 	int i;
 	sched->ops = ops;
 	sched->hw_submission_limit = hw_submission;
 	sched->name = name;
 	sched->timeout = timeout;
+	sched->hang_limit = hang_limit;
 	for (i = AMD_SCHED_PRIORITY_MIN; i < AMD_SCHED_PRIORITY_MAX; i++)
 		amd_sched_rq_init(&sched->sched_rq[i]);
 

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

@@ -144,11 +144,12 @@ struct amd_gpu_scheduler {
 	struct task_struct		*thread;
 	struct list_head	ring_mirror_list;
 	spinlock_t			job_list_lock;
+	int hang_limit;
 };
 
 int amd_sched_init(struct amd_gpu_scheduler *sched,
 		   const struct amd_sched_backend_ops *ops,
-		   uint32_t hw_submission, long timeout, const char *name);
+		   uint32_t hw_submission, unsigned hang_limit, long timeout, const char *name);
 void amd_sched_fini(struct amd_gpu_scheduler *sched);
 
 int amd_sched_entity_init(struct amd_gpu_scheduler *sched,