[Mesa-dev] [PATCH] r600g/radeonsi: Map transfer staging texture unsynchronized when possible

[Michel Dänzer]

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

The transfer staging texture is always freshly allocated, so for write-only
transfers we don't need to explicitly wait for the BO to become idle.

Squeezes a few hundered MB/s more out of x11perf -shmput500 with glamor.

Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
---
 src/gallium/drivers/radeon/r600_texture.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/gallium/drivers/radeon/r600_texture.c b/src/gallium/drivers/radeon/r600_texture.c
index 293eeaa..c410543 100644
--- a/src/gallium/drivers/radeon/r600_texture.c
+++ b/src/gallium/drivers/radeon/r600_texture.c
@@ -1039,6 +1039,8 @@ static void *r600_texture_transfer_map(struct pipe_context *ctx,
 
 	if (trans->staging) {
 		buf = trans->staging;
+		if (!rtex->is_depth && !(usage & PIPE_TRANSFER_READ))
+			usage |= PIPE_TRANSFER_UNSYNCHRONIZED;
 	} else {
 		buf = &rtex->resource;
 	}
-- 
1.9.0