r600g: flush FMASK and CMASK when changing colorbuffers on Evergreen

This fixes rare graphical corruption.

NOTE: This is a candidate for the stable branches.

src/gallium/drivers/r600/evergreen_state.c

@@ -1458,6 +1458,10 @@ static void evergreen_set_framebuffer_state(struct pipe_context *ctx,
 
 	if (rctx->framebuffer.state.nr_cbufs) {
 		rctx->flags |= R600_CONTEXT_CB_FLUSH;
+
+		if (rctx->framebuffer.state.cbufs[0]->texture->nr_samples > 1) {
+			rctx->flags |= R600_CONTEXT_FLUSH_AND_INV_CB_META;
+		}
 	}
 	if (rctx->framebuffer.state.zsbuf) {
 		rctx->flags |= R600_CONTEXT_DB_FLUSH;

src/gallium/drivers/r600/r600.h

@@ -190,6 +190,7 @@ struct r600_so_target {
 #define R600_CONTEXT_WAIT_IDLE			(1 << 7)
 #define R600_CONTEXT_FLUSH_AND_INV		(1 << 8)
 #define R600_CONTEXT_HTILE_ERRATA		(1 << 9)
+#define R600_CONTEXT_FLUSH_AND_INV_CB_META	(1 << 10)
 
 struct r600_context;
 struct r600_screen;

src/gallium/drivers/r600/r600_hw_context.c

@@ -684,6 +684,12 @@ void r600_flush_emit(struct r600_context *rctx)
 		cs->buf[cs->cdw++] = EVENT_TYPE(EVENT_TYPE_PS_PARTIAL_FLUSH) | EVENT_INDEX(4);
 	}
 
+	if (rctx->chip_class >= R700 &&
+	    (rctx->flags & R600_CONTEXT_FLUSH_AND_INV_CB_META)) {
+		cs->buf[cs->cdw++] = PKT3(PKT3_EVENT_WRITE, 0, 0);
+		cs->buf[cs->cdw++] = EVENT_TYPE(EVENT_TYPE_FLUSH_AND_INV_CB_META) | EVENT_INDEX(0);
+	}
+
 	if (rctx->flags & R600_CONTEXT_FLUSH_AND_INV) {
 		cs->buf[cs->cdw++] = PKT3(PKT3_EVENT_WRITE, 0, 0);
 		cs->buf[cs->cdw++] = EVENT_TYPE(EVENT_TYPE_CACHE_FLUSH_AND_INV_EVENT) | EVENT_INDEX(0);

src/gallium/drivers/r600/r600_hw_context_priv.h

@@ -29,7 +29,7 @@
 #include "r600_pipe.h"
 
 /* the number of CS dwords for flushing and drawing */
-#define R600_MAX_FLUSH_CS_DWORDS 44
+#define R600_MAX_FLUSH_CS_DWORDS 46
 #define R600_MAX_DRAW_CS_DWORDS 34
 
 /* these flags are used in register flags and added into block flags */

src/gallium/drivers/r600/r600_state.c

@@ -1456,6 +1456,11 @@ static void r600_set_framebuffer_state(struct pipe_context *ctx,
 
 	if (rctx->framebuffer.state.nr_cbufs) {
 		rctx->flags |= R600_CONTEXT_CB_FLUSH;
+
+		if (rctx->chip_class >= R700 &&
+		    rctx->framebuffer.state.cbufs[0]->texture->nr_samples > 1) {
+			rctx->flags |= R600_CONTEXT_FLUSH_AND_INV_CB_META;
+		}
 	}
 	if (rctx->framebuffer.state.zsbuf) {
 		rctx->flags |= R600_CONTEXT_DB_FLUSH;

src/gallium/drivers/r600/r600d.h

@@ -119,6 +119,7 @@
 #define EVENT_TYPE_CACHE_FLUSH_AND_INV_EVENT   0x16
 #define EVENT_TYPE_SO_VGTSTREAMOUT_FLUSH	0x1f
 #define EVENT_TYPE_SAMPLE_STREAMOUTSTATS	0x20
+#define EVENT_TYPE_FLUSH_AND_INV_CB_META	46 /* supported on r700+ */
 #define		EVENT_TYPE(x)                           ((x) << 0)
 #define		EVENT_INDEX(x)                          ((x) << 8)
                 /* 0 - any non-TS event