drm: Consolidate plane arrays in drm_atomic_state

It's kinda pointless to have 2 separate mallocs for these. And when we
add more per-plane state in the future it's even more pointless.

Right now there's no such thing planned, but both Gustavo's per-crtc
fence patches, and some nonblocking commit helpers I'm playing around
with will add more per-crtc stuff. It makes sense to also consolidate
planes, just for consistency.

In the future we can use this to store a pointer to the preceeding
state, making an atomic update entirely free-standing. This will be
needed to be able to queue them up with a depth > 1.

Cc: Gustavo Padovan <gustavo@padovan.org>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1464818821-5736-11-git-send-email-daniel.vetter@ffwll.ch

drivers/gpu/drm/drm_atomic.c

@@ -47,7 +47,6 @@ void drm_atomic_state_default_release(struct drm_atomic_state *state)
 	kfree(state->crtcs);
 	kfree(state->crtc_states);
 	kfree(state->planes);
-	kfree(state->plane_states);
 }
 EXPORT_SYMBOL(drm_atomic_state_default_release);
 
@@ -79,10 +78,6 @@ drm_atomic_state_init(struct drm_device *dev, struct drm_atomic_state *state)
 				sizeof(*state->planes), GFP_KERNEL);
 	if (!state->planes)
 		goto fail;
-	state->plane_states = kcalloc(dev->mode_config.num_total_plane,
-				      sizeof(*state->plane_states), GFP_KERNEL);
-	if (!state->plane_states)
-		goto fail;
 
 	state->dev = dev;
 
@@ -163,15 +158,15 @@ void drm_atomic_state_default_clear(struct drm_atomic_state *state)
 	}
 
 	for (i = 0; i < config->num_total_plane; i++) {
-		struct drm_plane *plane = state->planes[i];
+		struct drm_plane *plane = state->planes[i].ptr;
 
 		if (!plane)
 			continue;
 
 		plane->funcs->atomic_destroy_state(plane,
-						   state->plane_states[i]);
-		state->planes[i] = NULL;
-		state->plane_states[i] = NULL;
+						   state->planes[i].state);
+		state->planes[i].ptr = NULL;
+		state->planes[i].state = NULL;
 	}
 }
 EXPORT_SYMBOL(drm_atomic_state_default_clear);
@@ -630,8 +625,8 @@ drm_atomic_get_plane_state(struct drm_atomic_state *state,
 	if (!plane_state)
 		return ERR_PTR(-ENOMEM);
 
-	state->plane_states[index] = plane_state;
-	state->planes[index] = plane;
+	state->planes[index].state = plane_state;
+	state->planes[index].ptr = plane;
 	plane_state->state = state;
 
 	DRM_DEBUG_ATOMIC("Added [PLANE:%d:%s] %p state to %p\n",

drivers/gpu/drm/drm_atomic_helper.c

@@ -1584,7 +1584,7 @@ void drm_atomic_helper_swap_state(struct drm_device *dev,
 
 	for_each_plane_in_state(state, plane, plane_state, i) {
 		plane->state->state = state;
-		swap(state->plane_states[i], plane->state);
+		swap(state->planes[i].state, plane->state);
 		plane->state->state = NULL;
 	}
 }

drivers/gpu/drm/i915/intel_atomic.c

@@ -191,7 +191,7 @@ int intel_atomic_setup_scalers(struct drm_device *dev,
 
 			/* plane scaler case: assign as a plane scaler */
 			/* find the plane that set the bit as scaler_user */
-			plane = drm_state->planes[i];
+			plane = drm_state->planes[i].ptr;
 
 			/*
 			 * to enable/disable hq mode, add planes that are using scaler

include/drm/drm_atomic.h

@@ -86,7 +86,7 @@ static inline struct drm_plane_state *
 drm_atomic_get_existing_plane_state(struct drm_atomic_state *state,
 				    struct drm_plane *plane)
 {
-	return state->plane_states[drm_plane_index(plane)];
+	return state->planes[drm_plane_index(plane)].state;
 }
 
 /**
@@ -139,8 +139,8 @@ static inline const struct drm_plane_state *
 __drm_atomic_get_current_plane_state(struct drm_atomic_state *state,
 				     struct drm_plane *plane)
 {
-	if (state->plane_states[drm_plane_index(plane)])
-		return state->plane_states[drm_plane_index(plane)];
+	if (state->planes[drm_plane_index(plane)].state)
+		return state->planes[drm_plane_index(plane)].state;
 
 	return plane->state;
 }
@@ -191,11 +191,11 @@ int __must_check drm_atomic_nonblocking_commit(struct drm_atomic_state *state);
 	     (__i)++)						\
 		for_each_if (crtc_state)
 
-#define for_each_plane_in_state(state, plane, plane_state, __i)		\
+#define for_each_plane_in_state(__state, plane, plane_state, __i)		\
 	for ((__i) = 0;							\
-	     (__i) < (state)->dev->mode_config.num_total_plane &&	\
-	     ((plane) = (state)->planes[__i],				\
-	     (plane_state) = (state)->plane_states[__i], 1);		\
+	     (__i) < (__state)->dev->mode_config.num_total_plane &&	\
+	     ((plane) = (__state)->planes[__i].ptr,				\
+	     (plane_state) = (__state)->planes[__i].state, 1);		\
 	     (__i)++)							\
 		for_each_if (plane_state)
 static inline bool

include/drm/drm_crtc.h

@@ -1693,6 +1693,11 @@ struct drm_bridge {
 	void *driver_private;
 };
 
+struct __drm_planes_state {
+	struct drm_plane *ptr;
+	struct drm_plane_state *state;
+};
+
 struct __drm_connnectors_state {
 	struct drm_connector *ptr;
 	struct drm_connector_state *state;
@@ -1704,8 +1709,7 @@ struct __drm_connnectors_state {
  * @allow_modeset: allow full modeset
  * @legacy_cursor_update: hint to enforce legacy cursor IOCTL semantics
  * @legacy_set_config: Disable conflicting encoders instead of failing with -EINVAL.
- * @planes: pointer to array of plane pointers
- * @plane_states: pointer to array of plane states pointers
+ * @planes: pointer to array of structures with per-plane data
  * @crtcs: pointer to array of CRTC pointers
  * @crtc_states: pointer to array of CRTC states pointers
  * @num_connector: size of the @connectors and @connector_states arrays
@@ -1717,8 +1721,7 @@ struct drm_atomic_state {
 	bool allow_modeset : 1;
 	bool legacy_cursor_update : 1;
 	bool legacy_set_config : 1;
-	struct drm_plane **planes;
-	struct drm_plane_state **plane_states;
+	struct __drm_planes_state *planes;
 	struct drm_crtc **crtcs;
 	struct drm_crtc_state **crtc_states;
 	int num_connector;