drm/i915: drop bo->moving dependency

That should now be handled by the common dma_resv framework.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: intel-gfx@lists.freedesktop.org
Link: https://patchwork.freedesktop.org/patch/msgid/20220407085946.744568-13-christian.koenig@amd.com

drivers/gpu/drm/i915/gem/i915_gem_object.c

@@ -741,30 +741,19 @@ static const struct drm_gem_object_funcs i915_gem_object_funcs = {
 /**
  * i915_gem_object_get_moving_fence - Get the object's moving fence if any
  * @obj: The object whose moving fence to get.
+ * @fence: The resulting fence
  *
  * A non-signaled moving fence means that there is an async operation
  * pending on the object that needs to be waited on before setting up
  * any GPU- or CPU PTEs to the object's pages.
  *
- * Return: A refcounted pointer to the object's moving fence if any,
- * NULL otherwise.
+ * Return: Negative error code or 0 for success.
  */
-struct dma_fence *
-i915_gem_object_get_moving_fence(struct drm_i915_gem_object *obj)
+int i915_gem_object_get_moving_fence(struct drm_i915_gem_object *obj,
+				     struct dma_fence **fence)
 {
-	return dma_fence_get(i915_gem_to_ttm(obj)->moving);
-}
-
-void i915_gem_object_set_moving_fence(struct drm_i915_gem_object *obj,
-				      struct dma_fence *fence)
-{
-	struct dma_fence **moving = &i915_gem_to_ttm(obj)->moving;
-
-	if (*moving == fence)
-		return;
-
-	dma_fence_put(*moving);
-	*moving = dma_fence_get(fence);
+	return dma_resv_get_singleton(obj->base.resv, DMA_RESV_USAGE_KERNEL,
+				      fence);
 }
 
 /**
@@ -782,23 +771,9 @@ void i915_gem_object_set_moving_fence(struct drm_i915_gem_object *obj,
 int i915_gem_object_wait_moving_fence(struct drm_i915_gem_object *obj,
 				      bool intr)
 {
-	struct dma_fence *fence = i915_gem_to_ttm(obj)->moving;
-	int ret;
-
 	assert_object_held(obj);
-	if (!fence)
-		return 0;
-
-	ret = dma_fence_wait(fence, intr);
-	if (ret)
-		return ret;
-
-	if (fence->error)
-		return fence->error;
-
-	i915_gem_to_ttm(obj)->moving = NULL;
-	dma_fence_put(fence);
-	return 0;
+	return dma_resv_wait_timeout(obj->base. resv, DMA_RESV_USAGE_KERNEL,
+				     intr, MAX_SCHEDULE_TIMEOUT);
 }
 
 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)

drivers/gpu/drm/i915/gem/i915_gem_object.h

@@ -520,12 +520,8 @@ i915_gem_object_finish_access(struct drm_i915_gem_object *obj)
 	i915_gem_object_unpin_pages(obj);
 }
 
-struct dma_fence *
-i915_gem_object_get_moving_fence(struct drm_i915_gem_object *obj);
-
-void i915_gem_object_set_moving_fence(struct drm_i915_gem_object *obj,
-				      struct dma_fence *fence);
-
+int i915_gem_object_get_moving_fence(struct drm_i915_gem_object *obj,
+				     struct dma_fence **fence);
 int i915_gem_object_wait_moving_fence(struct drm_i915_gem_object *obj,
 				      bool intr);
 

drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c

@@ -467,19 +467,6 @@ __i915_ttm_move(struct ttm_buffer_object *bo,
 	return fence;
 }
 
-static int
-prev_deps(struct ttm_buffer_object *bo, struct ttm_operation_ctx *ctx,
-	  struct i915_deps *deps)
-{
-	int ret;
-
-	ret = i915_deps_add_dependency(deps, bo->moving, ctx);
-	if (!ret)
-		ret = i915_deps_add_resv(deps, bo->base.resv, ctx);
-
-	return ret;
-}
-
 /**
  * i915_ttm_move - The TTM move callback used by i915.
  * @bo: The buffer object.
@@ -534,7 +521,7 @@ int i915_ttm_move(struct ttm_buffer_object *bo, bool evict,
 		struct i915_deps deps;
 
 		i915_deps_init(&deps, GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN);
-		ret = prev_deps(bo, ctx, &deps);
+		ret = i915_deps_add_resv(&deps, bo->base.resv, ctx);
 		if (ret) {
 			i915_refct_sgt_put(dst_rsgt);
 			return ret;

drivers/gpu/drm/i915/gem/selftests/i915_gem_migrate.c

@@ -219,8 +219,7 @@ static int __igt_lmem_pages_migrate(struct intel_gt *gt,
 			err = dma_resv_reserve_fences(obj->base.resv, 1);
 			if (!err)
 				dma_resv_add_fence(obj->base.resv, &rq->fence,
-						   DMA_RESV_USAGE_WRITE);
-			i915_gem_object_set_moving_fence(obj, &rq->fence);
+						   DMA_RESV_USAGE_KERNEL);
 			i915_request_put(rq);
 		}
 		if (err)

drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c

@@ -1221,8 +1221,7 @@ static int __igt_mmap_migrate(struct intel_memory_region **placements,
 	i915_gem_object_unpin_pages(obj);
 	if (rq) {
 		dma_resv_add_fence(obj->base.resv, &rq->fence,
-				   DMA_RESV_USAGE_WRITE);
-		i915_gem_object_set_moving_fence(obj, &rq->fence);
+				   DMA_RESV_USAGE_KERNEL);
 		i915_request_put(rq);
 	}
 	i915_gem_object_unlock(obj);

drivers/gpu/drm/i915/i915_vma.c

@@ -1357,10 +1357,17 @@ int i915_vma_pin_ww(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
 	if (err)
 		return err;
 
+	if (vma->obj) {
+		err = i915_gem_object_get_moving_fence(vma->obj, &moving);
+		if (err)
+			return err;
+	} else {
+		moving = NULL;
+	}
+
 	if (flags & PIN_GLOBAL)
 		wakeref = intel_runtime_pm_get(&vma->vm->i915->runtime_pm);
 
-	moving = vma->obj ? i915_gem_object_get_moving_fence(vma->obj) : NULL;
 	if (flags & vma->vm->bind_async_flags || moving) {
 		/* lock VM */
 		err = i915_vm_lock_objects(vma->vm, ww);