drm/i915: Add aliases for uapi and hw to crtc_state

Prepare to split up hw and uapi machinally, by adding a uapi and
hw alias. We will remove the base in a bit. This is a split from the
original uapi/hw patch, which did it all in one go.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191031112610.27608-2-maarten.lankhorst@linux.intel.comReviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

drivers/gpu/drm/i915/display/intel_atomic.c

@@ -186,9 +186,10 @@ intel_digital_connector_duplicate_state(struct drm_connector *connector)
 struct drm_crtc_state *
 intel_crtc_duplicate_state(struct drm_crtc *crtc)
 {
+	const struct intel_crtc_state *old_crtc_state = to_intel_crtc_state(crtc->state);
 	struct intel_crtc_state *crtc_state;
 
-	crtc_state = kmemdup(crtc->state, sizeof(*crtc_state), GFP_KERNEL);
+	crtc_state = kmemdup(old_crtc_state, sizeof(*crtc_state), GFP_KERNEL);
 	if (!crtc_state)
 		return NULL;
 
@@ -219,7 +220,10 @@ void
 intel_crtc_destroy_state(struct drm_crtc *crtc,
 			 struct drm_crtc_state *state)
 {
-	drm_atomic_helper_crtc_destroy_state(crtc, state);
+	struct intel_crtc_state *crtc_state = to_intel_crtc_state(state);
+
+	__drm_atomic_helper_crtc_destroy_state(&crtc_state->base);
+	kfree(crtc_state);
 }
 
 static void intel_atomic_setup_scaler(struct intel_crtc_scaler_state *scaler_state,

drivers/gpu/drm/i915/display/intel_display.c

@@ -12592,6 +12592,8 @@ clear_intel_crtc_state(struct intel_crtc_state *crtc_state)
 
 	/* Keep base drm_crtc_state intact, only clear our extended struct */
 	BUILD_BUG_ON(offsetof(struct intel_crtc_state, base));
+	BUILD_BUG_ON(offsetof(struct intel_crtc_state, uapi));
+	BUILD_BUG_ON(offsetof(struct intel_crtc_state, hw));
 	memcpy(&crtc_state->base + 1, &saved_state->base + 1,
 	       sizeof(*crtc_state) - sizeof(crtc_state->base));
 

drivers/gpu/drm/i915/display/intel_display.h

@@ -447,10 +447,10 @@ enum phy_fia {
 #define intel_atomic_crtc_state_for_each_plane_state( \
 		  plane, plane_state, \
 		  crtc_state) \
-	for_each_intel_plane_mask(((crtc_state)->base.state->dev), (plane), \
-				((crtc_state)->base.plane_mask)) \
+	for_each_intel_plane_mask(((crtc_state)->uapi.state->dev), (plane), \
+				((crtc_state)->uapi.plane_mask)) \
 		for_each_if ((plane_state = \
-			      to_intel_plane_state(__drm_atomic_get_current_plane_state((crtc_state)->base.state, &plane->base))))
+			      to_intel_plane_state(__drm_atomic_get_current_plane_state((crtc_state)->uapi.state, &plane->base))))
 
 void intel_link_compute_m_n(u16 bpp, int nlanes,
 			    int pixel_clock, int link_clock,

drivers/gpu/drm/i915/display/intel_display_types.h

@@ -757,7 +757,32 @@ enum intel_output_format {
 };
 
 struct intel_crtc_state {
+	union {
 	struct drm_crtc_state base;
+	/*
+	 * uapi (drm) state. This is the software state shown to userspace.
+	 * In particular, the following members are used for bookkeeping:
+	 * - crtc
+	 * - state
+	 * - *_changed
+	 * - event
+	 * - commit
+	 * - mode_blob
+	 */
+	struct drm_crtc_state uapi;
+
+	/*
+	 * actual hardware state, the state we program to the hardware.
+	 * The following members are used to verify the hardware state:
+	 * - enable
+	 * - active
+	 * - mode / adjusted_mode
+	 * - color property blobs.
+	 *
+	 * During initial hw readout, they need to be copied to uapi.
+	 */
+	struct drm_crtc_state hw;
+	};
 
 	/**
 	 * quirks - bitfield with hw state readout quirks
@@ -1112,7 +1137,7 @@ struct cxsr_latency {
 
 #define to_intel_atomic_state(x) container_of(x, struct intel_atomic_state, base)
 #define to_intel_crtc(x) container_of(x, struct intel_crtc, base)
-#define to_intel_crtc_state(x) container_of(x, struct intel_crtc_state, base)
+#define to_intel_crtc_state(x) container_of(x, struct intel_crtc_state, uapi)
 #define to_intel_connector(x) container_of(x, struct intel_connector, base)
 #define to_intel_encoder(x) container_of(x, struct intel_encoder, base)
 #define to_intel_framebuffer(x) container_of(x, struct intel_framebuffer, base)