drm/amdgpu: cleanup amdgpu_sync_rings V2

No longer needed now that semaphores are gone.

V2: remove the first amdgpu_sync_wait in amdgpu_ib_schedule
Signed-off-by: Chunming Zhou <David1.Zhou@amd.com>
Reviewed-by: Ken Wang  <Qingqing.Wang@amd.com> (V1)
Reviewed-by: Monk Liu <monk.liu@amd.com> (V2)
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -654,8 +654,6 @@ int amdgpu_sync_resv(struct amdgpu_device *adev,
 		     struct amdgpu_sync *sync,
 		     struct reservation_object *resv,
 		     void *owner);
-int amdgpu_sync_rings(struct amdgpu_sync *sync,
-		      struct amdgpu_ring *ring);
 struct fence *amdgpu_sync_get_fence(struct amdgpu_sync *sync);
 int amdgpu_sync_wait(struct amdgpu_sync *sync);
 void amdgpu_sync_free(struct amdgpu_device *adev, struct amdgpu_sync *sync,

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

@@ -141,11 +141,7 @@ int amdgpu_ib_schedule(struct amdgpu_device *adev, unsigned num_ibs,
 		dev_err(adev->dev, "couldn't schedule ib\n");
 		return -EINVAL;
 	}
-	r = amdgpu_sync_wait(&ibs->sync);
-	if (r) {
-		dev_err(adev->dev, "IB sync failed (%d).\n", r);
-		return r;
-	}
+
 	r = amdgpu_ring_lock(ring, (256 + AMDGPU_NUM_SYNCS * 8) * num_ibs);
 	if (r) {
 		dev_err(adev->dev, "scheduling IB failed (%d).\n", r);
@@ -161,10 +157,10 @@ int amdgpu_ib_schedule(struct amdgpu_device *adev, unsigned num_ibs,
 		}
 	}
 
-	r = amdgpu_sync_rings(&ibs->sync, ring);
+	r = amdgpu_sync_wait(&ibs->sync);
 	if (r) {
 		amdgpu_ring_unlock_undo(ring);
-		dev_err(adev->dev, "failed to sync rings (%d)\n", r);
+		dev_err(adev->dev, "failed to sync wait (%d)\n", r);
 		return r;
 	}
 

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

@@ -260,48 +260,6 @@ int amdgpu_sync_wait(struct amdgpu_sync *sync)
 	return 0;
 }
 
-/**
- * amdgpu_sync_rings - sync ring to all registered fences
- *
- * @sync: sync object to use
- * @ring: ring that needs sync
- *
- * Ensure that all registered fences are signaled before letting
- * the ring continue. The caller must hold the ring lock.
- */
-int amdgpu_sync_rings(struct amdgpu_sync *sync,
-		      struct amdgpu_ring *ring)
-{
-	struct amdgpu_device *adev = ring->adev;
-	int i, r;
-
-	for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
-		struct amdgpu_ring *other = adev->rings[i];
-		struct amdgpu_fence *fence;
-
-		if (!sync->sync_to[i])
-			continue;
-
-		fence = to_amdgpu_fence(sync->sync_to[i]);
-
-		/* prevent GPU deadlocks */
-		if (!other->ready) {
-			dev_err(adev->dev, "Syncing to a disabled ring!");
-			return -EINVAL;
-		}
-
-		if (amdgpu_enable_scheduler) {
-			r = fence_wait(sync->sync_to[i], true);
-			if (r)
-				return r;
-			continue;
-		}
-
-	}
-
-	return 0;
-}
-
 /**
  * amdgpu_sync_free - free the sync object
  *