radeonsi/gfx10: implement hardware MSAA resolve

MSAA is only supported for 64KB_{R,Z}_X modes, so the micro tile
optimization that we use on gfx9 and earlier does not work.

Be very explicit about how the swizzle mode of the temporary surface is
selected.

Acked-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

src/amd/common/ac_surface.c

@@ -1510,7 +1510,7 @@ static int gfx9_compute_surface(ADDR_HANDLE addrlib,
 
 	case RADEON_SURF_MODE_1D:
 	case RADEON_SURF_MODE_2D:
-		if (surf->flags & RADEON_SURF_IMPORTED) {
+		if (surf->flags & (RADEON_SURF_IMPORTED | RADEON_SURF_FORCE_SWIZZLE_MODE)) {
 			AddrSurfInfoIn.swizzleMode = surf->u.gfx9.surf.swizzle_mode;
 			break;
 		}

src/amd/common/ac_surface.h

@@ -70,6 +70,7 @@ enum radeon_micro_mode {
 #define RADEON_SURF_OPTIMIZE_FOR_SPACE          (1 << 25)
 #define RADEON_SURF_SHAREABLE                   (1 << 26)
 #define RADEON_SURF_NO_RENDER_TARGET            (1 << 27)
+#define RADEON_SURF_FORCE_SWIZZLE_MODE          (1 << 28)
 
 struct legacy_surf_level {
     uint64_t                    offset;

src/gallium/drivers/radeonsi/si_blit.c

@@ -1109,6 +1109,12 @@ static bool do_hardware_msaa_resolve(struct pipe_context *ctx,
 			/* The next fast clear will switch to this mode to
 			 * get direct hw resolve next time if the mode is
 			 * different now.
+			 *
+			 * TODO-GFX10: This does not work in GFX10 because MSAA
+			 * is restricted to 64KB_R_X and 64KB_Z_X swizzle modes.
+			 * In some cases we could change the swizzle of the
+			 * destination texture instead, but the more general
+			 * solution is to implement compute shader resolve.
 			 */
 			src->last_msaa_resolve_target_micro_mode =
 				dst->surface.micro_tile_mode;

src/gallium/drivers/radeonsi/si_clear.c

@@ -277,7 +277,8 @@ void vi_dcc_clear_level(struct si_context *sctx,
 static void si_set_optimal_micro_tile_mode(struct si_screen *sscreen,
 					   struct si_texture *tex)
 {
-	if (tex->buffer.b.is_shared ||
+	if (sscreen->info.chip_class >= GFX10 ||
+	    tex->buffer.b.is_shared ||
 	    tex->buffer.b.b.nr_samples <= 1 ||
 	    tex->surface.micro_tile_mode == tex->last_msaa_resolve_target_micro_mode)
 		return;

src/gallium/drivers/radeonsi/si_texture.c

@@ -37,6 +37,7 @@
 #include <inttypes.h>
 #include "state_tracker/drm_driver.h"
 #include "sid.h"
+#include "amd/addrlib/inc/addrinterface.h"
 
 static enum radeon_surf_mode
 si_choose_tiling(struct si_screen *sscreen,
@@ -310,6 +311,12 @@ static int si_init_surface(struct si_screen *sscreen,
 	if (!(ptex->flags & SI_RESOURCE_FLAG_FORCE_MSAA_TILING))
 		flags |= RADEON_SURF_OPTIMIZE_FOR_SPACE;
 
+	if (sscreen->info.chip_class >= GFX10 &&
+	    (ptex->flags & SI_RESOURCE_FLAG_FORCE_MSAA_TILING)) {
+		flags |= RADEON_SURF_FORCE_SWIZZLE_MODE;
+		surface->u.gfx9.surf.swizzle_mode = ADDR_SW_64KB_R_X;
+	}
+
 	r = sscreen->ws->surface_init(sscreen->ws, ptex, flags, bpe,
 				      array_mode, surface);
 	if (r) {