[Mesa-dev] [PATCH 4/5] r600g, radeonsi: Use write-combined persistent GTT mappings

[Michel Dänzer]

From: Michel Dänzer <michel.daenzer at amd.com>

This is hopefully safe: The kernel makes sure writes to these mappings
finish before the GPU might start reading from them, and the GPU caches
are invalidated at the start of a command stream.

Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
---
 src/gallium/drivers/radeon/r600_buffer_common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/gallium/drivers/radeon/r600_buffer_common.c b/src/gallium/drivers/radeon/r600_buffer_common.c
index 40917f0..c8a0723 100644
--- a/src/gallium/drivers/radeon/r600_buffer_common.c
+++ b/src/gallium/drivers/radeon/r600_buffer_common.c
@@ -131,7 +131,7 @@ bool r600_init_resource(struct r600_common_screen *rscreen,
 	    res->b.b.flags & (PIPE_RESOURCE_FLAG_MAP_PERSISTENT |
 			      PIPE_RESOURCE_FLAG_MAP_COHERENT)) {
 		res->domains = RADEON_DOMAIN_GTT;
-		flags = 0;
+		flags = RADEON_FLAG_GTT_WC;
 	}
 
 	/* Tiled textures are unmappable. Always put them in VRAM. */
-- 
2.0.0