Mesa (master): r600g,radeonsi: Always use GTT again for PIPE_USAGE_STREAM buffers

[Michel Dänzer]

Module: Mesa
Branch: master
Commit: 7b4276d7acf2e0f77044cb50caa6ad936fa78786
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=7b4276d7acf2e0f77044cb50caa6ad936fa78786

Author: Michel Dänzer <michel.daenzer at amd.com>
Date:   Tue Aug 26 18:21:50 2014 +0900

r600g,radeonsi: Always use GTT again for PIPE_USAGE_STREAM buffers

Putting those in VRAM can cause long pauses due to buffers being moved
into / out of VRAM.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=84662
Cc: mesa-stable at lists.freedesktop.org
Reviewed-by: Alex Deucher <alexander.deucher at amd.com>

---

 src/gallium/drivers/radeon/r600_buffer_common.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/gallium/drivers/radeon/r600_buffer_common.c b/src/gallium/drivers/radeon/r600_buffer_common.c
index 227a221..b7306d7 100644
--- a/src/gallium/drivers/radeon/r600_buffer_common.c
+++ b/src/gallium/drivers/radeon/r600_buffer_common.c
@@ -110,11 +110,13 @@ bool r600_init_resource(struct r600_common_screen *rscreen,
 	enum radeon_bo_flag flags = 0;
 
 	switch (res->b.b.usage) {
+	case PIPE_USAGE_STREAM:
+		flags = RADEON_FLAG_GTT_WC;
+		/* fall through */
 	case PIPE_USAGE_STAGING:
 		/* Transfers are likely to occur more often with these resources. */
 		res->domains = RADEON_DOMAIN_GTT;
 		break;
-	case PIPE_USAGE_STREAM:
 	case PIPE_USAGE_DYNAMIC:
 		/* Older kernels didn't always flush the HDP cache before
 		 * CS execution