drm/vkms: init plane using drmm_universal_plane_alloc

By using drmm_universal_plane_alloc instead of
drm_universal_plane_init, we let the DRM infrastructure handles
resource allocation and cleanup. We can also get rid of some
code repetitions for plane cleanup, improving code maintainability
in vkms.
Signed-off-by: Melissa Wen <melissa.srw@gmail.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/3bbdabed0274d2d0917d1b829dd16f13d7b495f5.1619250933.git.melissa.srw@gmail.com

drivers/gpu/drm/vkms/vkms_drv.h

@@ -37,6 +37,10 @@ struct vkms_plane_state {
 	struct vkms_composer *composer;
 };
 
+struct vkms_plane {
+	struct drm_plane base;
+};
+
 /**
  * vkms_crtc_state - Driver specific CRTC state
  * @base: base CRTC state
@@ -114,7 +118,7 @@ int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
 
 int vkms_output_init(struct vkms_device *vkmsdev, int index);
 
-struct drm_plane *vkms_plane_init(struct vkms_device *vkmsdev,
+struct vkms_plane *vkms_plane_init(struct vkms_device *vkmsdev,
 				   enum drm_plane_type type, int index);
 
 /* CRC Support */

drivers/gpu/drm/vkms/vkms_output.c

@@ -39,7 +39,7 @@ int vkms_output_init(struct vkms_device *vkmsdev, int index)
 	struct drm_connector *connector = &output->connector;
 	struct drm_encoder *encoder = &output->encoder;
 	struct drm_crtc *crtc = &output->crtc;
-	struct drm_plane *primary, *cursor = NULL;
+	struct vkms_plane *primary, *cursor = NULL;
 	int ret;
 	int writeback;
 
@@ -49,15 +49,13 @@ int vkms_output_init(struct vkms_device *vkmsdev, int index)
 
 	if (vkmsdev->config->cursor) {
 		cursor = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_CURSOR, index);
-		if (IS_ERR(cursor)) {
-			ret = PTR_ERR(cursor);
-			goto err_cursor;
-		}
+		if (IS_ERR(cursor))
+			return PTR_ERR(cursor);
 	}
 
-	ret = vkms_crtc_init(dev, crtc, primary, cursor);
+	ret = vkms_crtc_init(dev, crtc, &primary->base, &cursor->base);
 	if (ret)
-		goto err_crtc;
+		return ret;
 
 	ret = drm_connector_init(dev, connector, &vkms_connector_funcs,
 				 DRM_MODE_CONNECTOR_VIRTUAL);
@@ -100,12 +98,5 @@ int vkms_output_init(struct vkms_device *vkmsdev, int index)
 err_connector:
 	drm_crtc_cleanup(crtc);
 
-err_crtc:
-	if (vkmsdev->config->cursor)
-		drm_plane_cleanup(cursor);
-
-err_cursor:
-	drm_plane_cleanup(primary);
-
 	return ret;
 }

drivers/gpu/drm/vkms/vkms_plane.c

@@ -86,7 +86,6 @@ static void vkms_plane_reset(struct drm_plane *plane)
 static const struct drm_plane_funcs vkms_plane_funcs = {
 	.update_plane		= drm_atomic_helper_update_plane,
 	.disable_plane		= drm_atomic_helper_disable_plane,
-	.destroy		= drm_plane_cleanup,
 	.reset			= vkms_plane_reset,
 	.atomic_duplicate_state = vkms_plane_duplicate_state,
 	.atomic_destroy_state	= vkms_plane_destroy_state,
@@ -191,18 +190,14 @@ static const struct drm_plane_helper_funcs vkms_primary_helper_funcs = {
 	.cleanup_fb		= vkms_cleanup_fb,
 };
 
-struct drm_plane *vkms_plane_init(struct vkms_device *vkmsdev,
+struct vkms_plane *vkms_plane_init(struct vkms_device *vkmsdev,
 				   enum drm_plane_type type, int index)
 {
 	struct drm_device *dev = &vkmsdev->drm;
 	const struct drm_plane_helper_funcs *funcs;
-	struct drm_plane *plane;
+	struct vkms_plane *plane;
 	const u32 *formats;
-	int ret, nformats;
-
-	plane = kzalloc(sizeof(*plane), GFP_KERNEL);
-	if (!plane)
-		return ERR_PTR(-ENOMEM);
+	int nformats;
 
 	if (type == DRM_PLANE_TYPE_CURSOR) {
 		formats = vkms_cursor_formats;
@@ -214,16 +209,14 @@ struct drm_plane *vkms_plane_init(struct vkms_device *vkmsdev,
 		funcs = &vkms_primary_helper_funcs;
 	}
 
-	ret = drm_universal_plane_init(dev, plane, 1 << index,
+	plane = drmm_universal_plane_alloc(dev, struct vkms_plane, base, 1 << index,
 					   &vkms_plane_funcs,
 					   formats, nformats,
 					   NULL, type, NULL);
-	if (ret) {
-		kfree(plane);
-		return ERR_PTR(ret);
-	}
+	if (IS_ERR(plane))
+		return plane;
 
-	drm_plane_helper_add(plane, funcs);
+	drm_plane_helper_add(&plane->base, funcs);
 
 	return plane;
 }