drm/amdgpu: directly return fence from ib_schedule

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -1181,7 +1181,8 @@ int amdgpu_ib_get(struct amdgpu_device *adev, struct amdgpu_vm *vm,
 		  unsigned size, struct amdgpu_ib *ib);
 void amdgpu_ib_free(struct amdgpu_device *adev, struct amdgpu_ib *ib);
 int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
-		       struct amdgpu_ib *ib, void *owner);
+		       struct amdgpu_ib *ib, void *owner,
+		       struct fence **f);
 int amdgpu_ib_pool_init(struct amdgpu_device *adev);
 void amdgpu_ib_pool_fini(struct amdgpu_device *adev);
 int amdgpu_ib_ring_tests(struct amdgpu_device *adev);

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

@@ -104,6 +104,7 @@ void amdgpu_ib_free(struct amdgpu_device *adev, struct amdgpu_ib *ib)
  * @num_ibs: number of IBs to schedule
  * @ibs: IB objects to schedule
  * @owner: owner for creating the fences
+ * @f: fence created during this submission
  *
  * Schedule an IB on the associated ring (all asics).
  * Returns 0 on success, error on failure.
@@ -119,7 +120,8 @@ void amdgpu_ib_free(struct amdgpu_device *adev, struct amdgpu_ib *ib)
  * to SI there was just a DE IB.
  */
 int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
-		       struct amdgpu_ib *ibs, void *owner)
+		       struct amdgpu_ib *ibs, void *owner,
+		       struct fence **f)
 {
 	struct amdgpu_device *adev = ring->adev;
 	struct amdgpu_ib *ib = &ibs[0];
@@ -200,6 +202,9 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
 				       AMDGPU_FENCE_FLAG_64BIT);
 	}
 
+	if (f)
+		*f = fence_get(&ib->fence->base);
+
 	amdgpu_ring_commit(ring);
 	return 0;
 }

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

@@ -88,7 +88,7 @@ static struct fence *amdgpu_sched_dependency(struct amd_sched_job *sched_job)
 
 static struct fence *amdgpu_sched_run_job(struct amd_sched_job *sched_job)
 {
-	struct amdgpu_fence *fence = NULL;
+	struct fence *fence = NULL;
 	struct amdgpu_job *job;
 	int r;
 
@@ -98,21 +98,19 @@ static struct fence *amdgpu_sched_run_job(struct amd_sched_job *sched_job)
 	}
 	job = to_amdgpu_job(sched_job);
 	trace_amdgpu_sched_run_job(job);
-	r = amdgpu_ib_schedule(job->ring, job->num_ibs, job->ibs, job->owner);
+	r = amdgpu_ib_schedule(job->ring, job->num_ibs, job->ibs,
+			       job->owner, &fence);
 	if (r) {
 		DRM_ERROR("Error scheduling IBs (%d)\n", r);
 		goto err;
 	}
 
-	fence = job->ibs[job->num_ibs - 1].fence;
-	fence_get(&fence->base);
-
 err:
 	if (job->free_job)
 		job->free_job(job);
 
 	kfree(job);
-	return fence ? &fence->base : NULL;
+	return fence;
 }
 
 struct amd_sched_backend_ops amdgpu_sched_ops = {