From: Eric Anholt <eric@anholt.net>
Date: Wed, 11 Jul 2018 18:22:16 +0000 (-0700)
Subject: v3d: Don't automatically reallocate a PERSISTENT-mapped buffer.
X-Git-Url: https://git.libre-soc.org/?p=mesa.git;a=commitdiff_plain;h=7714896256d8850cb6c323ce4ecf11c489046966

v3d: Don't automatically reallocate a PERSISTENT-mapped buffer.

I had mistakenly used the COHERENT flag, which can only be set when
PERSISTENT is mapped, but isn't always.

Fixes piglit bufferstorage-persistent read
---

diff --git a/src/gallium/drivers/v3d/v3d_resource.c b/src/gallium/drivers/v3d/v3d_resource.c
index 74d49b4d810..3df03d71df4 100644
--- a/src/gallium/drivers/v3d/v3d_resource.c
+++ b/src/gallium/drivers/v3d/v3d_resource.c
@@ -168,7 +168,7 @@ v3d_resource_transfer_map(struct pipe_context *pctx,
          */
         if ((usage & PIPE_TRANSFER_DISCARD_RANGE) &&
             !(usage & PIPE_TRANSFER_UNSYNCHRONIZED) &&
-            !(prsc->flags & PIPE_RESOURCE_FLAG_MAP_COHERENT) &&
+            !(prsc->flags & PIPE_RESOURCE_FLAG_MAP_PERSISTENT) &&
             prsc->last_level == 0 &&
             prsc->width0 == box->width &&
             prsc->height0 == box->height &&