drm/vkms: Inherit plane state from struct drm_shadow_plane_state

Subclass struct drm_shadow_plane_state for VKMS planes and update
all plane-state callbacks accordingly.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Melissa Wen <melissa.srw@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210705074633.9425-3-tzimmermann@suse.de

drivers/gpu/drm/vkms/vkms_composer.c

@@ -251,7 +251,7 @@ void vkms_composer_worker(struct work_struct *work)
 
 	if (crtc_state->num_active_planes >= 1) {
 		act_plane = crtc_state->active_planes[0];
-		if (act_plane->base.plane->type == DRM_PLANE_TYPE_PRIMARY)
+		if (act_plane->base.base.plane->type == DRM_PLANE_TYPE_PRIMARY)
 			primary_composer = act_plane->composer;
 	}
 

drivers/gpu/drm/vkms/vkms_drv.h

@@ -7,6 +7,7 @@
 
 #include <drm/drm.h>
 #include <drm/drm_gem.h>
+#include <drm/drm_gem_atomic_helper.h>
 #include <drm/drm_encoder.h>
 #include <drm/drm_writeback.h>
 
@@ -33,7 +34,7 @@ struct vkms_composer {
  * @composer: data required for composing computation
  */
 struct vkms_plane_state {
-	struct drm_plane_state base;
+	struct drm_shadow_plane_state base;
 	struct vkms_composer *composer;
 };
 
@@ -111,7 +112,7 @@ struct vkms_device {
 	container_of(target, struct vkms_crtc_state, base)
 
 #define to_vkms_plane_state(target)\
-	container_of(target, struct vkms_plane_state, base)
+	container_of(target, struct vkms_plane_state, base.base)
 
 /* CRTC */
 int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,

drivers/gpu/drm/vkms/vkms_plane.c

@@ -40,17 +40,16 @@ vkms_plane_duplicate_state(struct drm_plane *plane)
 
 	vkms_state->composer = composer;
 
-	__drm_atomic_helper_plane_duplicate_state(plane,
-						  &vkms_state->base);
+	__drm_gem_duplicate_shadow_plane_state(plane, &vkms_state->base);
 
-	return &vkms_state->base;
+	return &vkms_state->base.base;
 }
 
 static void vkms_plane_destroy_state(struct drm_plane *plane,
 				     struct drm_plane_state *old_state)
 {
 	struct vkms_plane_state *vkms_state = to_vkms_plane_state(old_state);
-	struct drm_crtc *crtc = vkms_state->base.crtc;
+	struct drm_crtc *crtc = vkms_state->base.base.crtc;
 
 	if (crtc) {
 		/* dropping the reference we acquired in
@@ -63,7 +62,7 @@ static void vkms_plane_destroy_state(struct drm_plane *plane,
 	kfree(vkms_state->composer);
 	vkms_state->composer = NULL;
 
-	__drm_atomic_helper_plane_destroy_state(old_state);
+	__drm_gem_destroy_shadow_plane_state(&vkms_state->base);
 	kfree(vkms_state);
 }
 
@@ -71,8 +70,10 @@ static void vkms_plane_reset(struct drm_plane *plane)
 {
 	struct vkms_plane_state *vkms_state;
 
-	if (plane->state)
+	if (plane->state) {
 		vkms_plane_destroy_state(plane, plane->state);
+		plane->state = NULL; /* must be set to NULL here */
+	}
 
 	vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL);
 	if (!vkms_state) {
@@ -80,8 +81,7 @@ static void vkms_plane_reset(struct drm_plane *plane)
 		return;
 	}
 
-	plane->state = &vkms_state->base;
-	plane->state->plane = plane;
+	__drm_gem_reset_shadow_plane(plane, &vkms_state->base);
 }
 
 static const struct drm_plane_funcs vkms_plane_funcs = {