drm/ttm: drop the tt backend function paths.

These are now driver side.
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200907204630.1406528-14-airlied@gmail.com

drivers/gpu/drm/ttm/ttm_tt.c

@@ -222,10 +222,7 @@ void ttm_tt_destroy(struct ttm_bo_device *bdev, struct ttm_tt *ttm)
 		fput(ttm->swap_storage);
 
 	ttm->swap_storage = NULL;
-	if (bdev->driver->ttm_tt_destroy)
-		bdev->driver->ttm_tt_destroy(bdev, ttm);
-	else
-		ttm->func->destroy(bdev, ttm);
+	bdev->driver->ttm_tt_destroy(bdev, ttm);
 }
 
 static void ttm_tt_init_fields(struct ttm_tt *ttm,
@@ -313,10 +310,7 @@ EXPORT_SYMBOL(ttm_dma_tt_fini);
 void ttm_tt_unbind(struct ttm_bo_device *bdev, struct ttm_tt *ttm)
 {
 	if (ttm->state == tt_bound) {
-		if (bdev->driver->ttm_tt_unbind)
-			bdev->driver->ttm_tt_unbind(bdev, ttm);
-		else
-			ttm->func->unbind(bdev, ttm);
+		bdev->driver->ttm_tt_unbind(bdev, ttm);
 		ttm->state = tt_unbound;
 	}
 }
@@ -337,10 +331,7 @@ int ttm_tt_bind(struct ttm_bo_device *bdev,
 	if (ret)
 		return ret;
 
-	if (bdev->driver->ttm_tt_bind)
-		ret = bdev->driver->ttm_tt_bind(bdev, ttm, bo_mem);
-	else
-		ret = ttm->func->bind(bdev, ttm, bo_mem);
+	ret = bdev->driver->ttm_tt_bind(bdev, ttm, bo_mem);
 	if (unlikely(ret != 0))
 		return ret;
 

include/drm/ttm/ttm_tt.h

@@ -48,47 +48,9 @@ enum ttm_caching_state {
 	tt_cached
 };
 
-struct ttm_backend_func {
-	/**
-	 * struct ttm_backend_func member bind
-	 *
-	 * @ttm: Pointer to a struct ttm_tt.
-	 * @bo_mem: Pointer to a struct ttm_resource describing the
-	 * memory type and location for binding.
-	 *
-	 * Bind the backend pages into the aperture in the location
-	 * indicated by @bo_mem. This function should be able to handle
-	 * differences between aperture and system page sizes.
-	 */
-	int (*bind) (struct ttm_bo_device *bdev, struct ttm_tt *ttm, struct ttm_resource *bo_mem);
-
-	/**
-	 * struct ttm_backend_func member unbind
-	 *
-	 * @ttm: Pointer to a struct ttm_tt.
-	 *
-	 * Unbind previously bound backend pages. This function should be
-	 * able to handle differences between aperture and system page sizes.
-	 */
-	void (*unbind) (struct ttm_bo_device *bdev, struct ttm_tt *ttm);
-
-	/**
-	 * struct ttm_backend_func member destroy
-	 *
-	 * @ttm: Pointer to a struct ttm_tt.
-	 *
-	 * Destroy the backend. This will be call back from ttm_tt_destroy so
-	 * don't call ttm_tt_destroy from the callback or infinite loop.
-	 */
-	void (*destroy) (struct ttm_bo_device *bdev, struct ttm_tt *ttm);
-};
-
 /**
  * struct ttm_tt
  *
- * @func: Pointer to a struct ttm_backend_func that describes
- * the backend methods.
- * pointer.
  * @pages: Array of pages backing the data.
  * @num_pages: Number of pages in the page array.
  * @bdev: Pointer to the current struct ttm_bo_device.
@@ -102,7 +64,6 @@ struct ttm_backend_func {
  * memory.
  */
 struct ttm_tt {
-	struct ttm_backend_func *func;
 	struct page **pages;
 	uint32_t page_flags;
 	unsigned long num_pages;