Mesa (master): radeonsi: Synchronize a streamout write after read hazard.

[Bas Nieuwenhuizen]

Module: Mesa
Branch: master
Commit: fc67375379ec26eef63f8e530724cd53c97bc3d0
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=fc67375379ec26eef63f8e530724cd53c97bc3d0

Author: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>
Date:   Mon Apr 11 15:53:43 2016 +0200

radeonsi: Synchronize a streamout write after read hazard.

Signed-off-by: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle at amd.com>
Reviewed-by: Marek Olšák <marek.olsak at amd.com>

---

 src/gallium/drivers/radeonsi/si_descriptors.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/gallium/drivers/radeonsi/si_descriptors.c b/src/gallium/drivers/radeonsi/si_descriptors.c
index 6dd2e4f..b3792c2 100644
--- a/src/gallium/drivers/radeonsi/si_descriptors.c
+++ b/src/gallium/drivers/radeonsi/si_descriptors.c
@@ -883,6 +883,12 @@ static void si_set_streamout_targets(struct pipe_context *ctx,
 				 SI_CONTEXT_VS_PARTIAL_FLUSH;
 	}
 
+	/* All readers of the streamout targets need to be finished before we can
+	 * start writing to the targets.
+	 */
+	if (num_targets)
+		sctx->b.flags |= SI_CONTEXT_PS_PARTIAL_FLUSH;
+
 	/* Streamout buffers must be bound in 2 places:
 	 * 1) in VGT by setting the VGT_STRMOUT registers
 	 * 2) as shader resources