drm/vram: Add infrastructure for move_notify()

This patch prepares VRAM helpers for lazy unmapping of buffer objects.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reported-and-tested-by: Davidlohr Bueso <dbueso@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20190906122056.32018-4-tzimmermann@suse.de

drivers/gpu/drm/drm_vram_mm_helper.c

@@ -98,6 +98,17 @@ static int bo_driver_verify_access(struct ttm_buffer_object *bo,
 	return vmm->funcs->verify_access(bo, filp);
 }
 
+static void bo_driver_move_notify(struct ttm_buffer_object *bo,
+				  bool evict,
+				  struct ttm_mem_reg *new_mem)
+{
+	struct drm_vram_mm *vmm = drm_vram_mm_of_bdev(bo->bdev);
+
+	if (!vmm->funcs || !vmm->funcs->move_notify)
+		return;
+	vmm->funcs->move_notify(bo, evict, new_mem);
+}
+
 static int bo_driver_io_mem_reserve(struct ttm_bo_device *bdev,
 				    struct ttm_mem_reg *mem)
 {
@@ -140,6 +151,7 @@ static struct ttm_bo_driver bo_driver = {
 	.eviction_valuable = ttm_bo_eviction_valuable,
 	.evict_flags = bo_driver_evict_flags,
 	.verify_access = bo_driver_verify_access,
+	.move_notify = bo_driver_move_notify,
 	.io_mem_reserve = bo_driver_io_mem_reserve,
 	.io_mem_free = bo_driver_io_mem_free,
 };

include/drm/drm_vram_mm_helper.h

@@ -15,6 +15,8 @@ struct drm_device;
 	&ttm_bo_driver.evict_flags
  * @verify_access:	Provides an implementation for \
 	struct &ttm_bo_driver.verify_access
+ * @move_notify:	Provides an implementation for
+ *			struct &ttm_bo_driver.move_notify
  *
  * These callback function integrate VRAM MM with TTM buffer objects. New
  * functions can be added if necessary.
@@ -23,6 +25,8 @@ struct drm_vram_mm_funcs {
 	void (*evict_flags)(struct ttm_buffer_object *bo,
 			    struct ttm_placement *placement);
 	int (*verify_access)(struct ttm_buffer_object *bo, struct file *filp);
+	void (*move_notify)(struct ttm_buffer_object *bo, bool evict,
+			    struct ttm_mem_reg *new_mem);
 };
 
 /**