drm/i915/skl: Move per-pipe ddb allocations into crtc states

First part of cleaning up all of the skl watermark code. This moves the
structures for storing the ddb allocations of each pipe into
intel_crtc_state, along with moving the structures for storing the
current ddb allocations active on hardware into intel_crtc.

Changes since v1:
- Don't replace alloc->start = alloc->end = 0;

Signed-off-by: Lyude <cpaul@redhat.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>

drivers/gpu/drm/i915/i915_drv.h

@@ -1641,7 +1641,6 @@ static inline bool skl_ddb_entry_equal(const struct skl_ddb_entry *e1,
 }
 
 struct skl_ddb_allocation {
-	struct skl_ddb_entry pipe[I915_MAX_PIPES];
 	struct skl_ddb_entry plane[I915_MAX_PIPES][I915_MAX_PLANES]; /* packed/uv */
 	struct skl_ddb_entry y_plane[I915_MAX_PIPES][I915_MAX_PLANES];
 };

drivers/gpu/drm/i915/intel_display.c

@@ -14246,12 +14246,11 @@ static void skl_update_crtcs(struct drm_atomic_state *state,
 			     unsigned int *crtc_vblank_mask)
 {
 	struct drm_device *dev = state->dev;
-	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
 	struct drm_crtc *crtc;
+	struct intel_crtc *intel_crtc;
 	struct drm_crtc_state *old_crtc_state;
-	struct skl_ddb_allocation *new_ddb = &intel_state->wm_results.ddb;
-	struct skl_ddb_allocation *cur_ddb = &dev_priv->wm.skl_hw.ddb;
+	struct intel_crtc_state *cstate;
 	unsigned int updated = 0;
 	bool progress;
 	enum pipe pipe;
@@ -14269,12 +14268,14 @@ static void skl_update_crtcs(struct drm_atomic_state *state,
 		for_each_crtc_in_state(state, crtc, old_crtc_state, i) {
 			bool vbl_wait = false;
 			unsigned int cmask = drm_crtc_mask(crtc);
-			pipe = to_intel_crtc(crtc)->pipe;
+
+			intel_crtc = to_intel_crtc(crtc);
+			cstate = to_intel_crtc_state(crtc->state);
+			pipe = intel_crtc->pipe;
 
 			if (updated & cmask || !crtc->state->active)
 				continue;
-			if (skl_ddb_allocation_overlaps(state, cur_ddb, new_ddb,
-							pipe))
+			if (skl_ddb_allocation_overlaps(state, intel_crtc))
 				continue;
 
 			updated |= cmask;
@@ -14285,7 +14286,8 @@ static void skl_update_crtcs(struct drm_atomic_state *state,
 			 * then we need to wait for a vblank to pass for the
 			 * new ddb allocation to take effect.
 			 */
-			if (!skl_ddb_allocation_equals(cur_ddb, new_ddb, pipe) &&
+			if (!skl_ddb_entry_equal(&cstate->wm.skl.ddb,
+						 &intel_crtc->hw_ddb) &&
 			    !crtc->state->active_changed &&
 			    intel_state->wm_results.dirty_pipes != updated)
 				vbl_wait = true;

drivers/gpu/drm/i915/intel_drv.h

@@ -496,6 +496,7 @@ struct intel_crtc_wm_state {
 		struct {
 			/* gen9+ only needs 1-step wm programming */
 			struct skl_pipe_wm optimal;
+			struct skl_ddb_entry ddb;
 
 			/* cached plane data rate */
 			unsigned plane_data_rate[I915_MAX_PLANES];
@@ -733,6 +734,9 @@ struct intel_crtc {
 		bool cxsr_allowed;
 	} wm;
 
+	/* gen9+: ddb allocation currently being used */
+	struct skl_ddb_entry hw_ddb;
+
 	int scanline_offset;
 
 	struct {
@@ -1755,9 +1759,7 @@ bool skl_ddb_allocation_equals(const struct skl_ddb_allocation *old,
 			       const struct skl_ddb_allocation *new,
 			       enum pipe pipe);
 bool skl_ddb_allocation_overlaps(struct drm_atomic_state *state,
-				 const struct skl_ddb_allocation *old,
-				 const struct skl_ddb_allocation *new,
-				 enum pipe pipe);
+				 struct intel_crtc *intel_crtc);
 void skl_write_cursor_wm(struct intel_crtc *intel_crtc,
 			 const struct skl_wm_values *wm);
 void skl_write_plane_wm(struct intel_crtc *intel_crtc,

drivers/gpu/drm/i915/intel_pm.c

@@ -3062,7 +3062,6 @@ skl_ddb_get_pipe_allocation_limits(struct drm_device *dev,
 	struct drm_crtc *for_crtc = cstate->base.crtc;
 	unsigned int pipe_size, ddb_size;
 	int nth_active_pipe;
-	int pipe = to_intel_crtc(for_crtc)->pipe;
 
 	if (WARN_ON(!state) || !cstate->base.active) {
 		alloc->start = 0;
@@ -3090,7 +3089,7 @@ skl_ddb_get_pipe_allocation_limits(struct drm_device *dev,
 	 * we currently hold.
 	 */
 	if (!intel_state->active_pipe_changes) {
-		*alloc = dev_priv->wm.skl_hw.ddb.pipe[pipe];
+		*alloc = to_intel_crtc(for_crtc)->hw_ddb;
 		return;
 	}
 
@@ -3358,7 +3357,7 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
 	struct drm_plane *plane;
 	struct drm_plane_state *pstate;
 	enum pipe pipe = intel_crtc->pipe;
-	struct skl_ddb_entry *alloc = &ddb->pipe[pipe];
+	struct skl_ddb_entry *alloc = &cstate->wm.skl.ddb;
 	uint16_t alloc_size, start, cursor_blocks;
 	uint16_t *minimum = cstate->wm.skl.minimum_blocks;
 	uint16_t *y_minimum = cstate->wm.skl.minimum_y_blocks;
@@ -3374,7 +3373,7 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
 		return 0;
 
 	if (!cstate->base.active) {
-		ddb->pipe[pipe].start = ddb->pipe[pipe].end = 0;
+		alloc->start = alloc->end = 0;
 		return 0;
 	}
 
@@ -3901,37 +3900,29 @@ void skl_write_cursor_wm(struct intel_crtc *intel_crtc,
 			    &wm->ddb.plane[pipe][PLANE_CURSOR]);
 }
 
-bool skl_ddb_allocation_equals(const struct skl_ddb_allocation *old,
-			       const struct skl_ddb_allocation *new,
-			       enum pipe pipe)
-{
-	return new->pipe[pipe].start == old->pipe[pipe].start &&
-	       new->pipe[pipe].end == old->pipe[pipe].end;
-}
-
 static inline bool skl_ddb_entries_overlap(const struct skl_ddb_entry *a,
 					   const struct skl_ddb_entry *b)
 {
 	return a->start < b->end && b->start < a->end;
 }
 
 bool skl_ddb_allocation_overlaps(struct drm_atomic_state *state,
-				 const struct skl_ddb_allocation *old,
-				 const struct skl_ddb_allocation *new,
-				 enum pipe pipe)
+				 struct intel_crtc *intel_crtc)
 {
-	struct drm_device *dev = state->dev;
-	struct intel_crtc *intel_crtc;
-	enum pipe otherp;
+	struct drm_crtc *other_crtc;
+	struct drm_crtc_state *other_cstate;
+	struct intel_crtc *other_intel_crtc;
+	const struct skl_ddb_entry *ddb =
+		&to_intel_crtc_state(intel_crtc->base.state)->wm.skl.ddb;
+	int i;
 
-	for_each_intel_crtc(dev, intel_crtc) {
-		otherp = intel_crtc->pipe;
+	for_each_crtc_in_state(state, other_crtc, other_cstate, i) {
+		other_intel_crtc = to_intel_crtc(other_crtc);
 
-		if (otherp == pipe)
+		if (other_intel_crtc == intel_crtc)
 			continue;
 
-		if (skl_ddb_entries_overlap(&new->pipe[pipe],
-					    &old->pipe[otherp]))
+		if (skl_ddb_entries_overlap(ddb, &other_intel_crtc->hw_ddb))
 			return true;
 	}
 
@@ -4096,7 +4087,6 @@ skl_copy_wm_for_pipe(struct skl_wm_values *dst,
 	memcpy(dst->plane_trans[pipe], src->plane_trans[pipe],
 	       sizeof(dst->plane_trans[pipe]));
 
-	dst->ddb.pipe[pipe] = src->ddb.pipe[pipe];
 	memcpy(dst->ddb.y_plane[pipe], src->ddb.y_plane[pipe],
 	       sizeof(dst->ddb.y_plane[pipe]));
 	memcpy(dst->ddb.plane[pipe], src->ddb.plane[pipe],
@@ -4204,6 +4194,8 @@ static void skl_update_wm(struct drm_crtc *crtc)
 
 	skl_copy_wm_for_pipe(hw_vals, results, pipe);
 
+	intel_crtc->hw_ddb = cstate->wm.skl.ddb;
+
 	mutex_unlock(&dev_priv->wm.wm_mutex);
 }