Mesa (master): isl: Don't use surface format R32_FLOAT for typed atomic integer operations

[Kenneth Graunke]

Module: Mesa
Branch: master
Commit: 0cd37f9178d79ed62f1952939e1044cda5701a3a
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=0cd37f9178d79ed62f1952939e1044cda5701a3a

Author: Anuj Phogat <anuj.phogat at gmail.com>
Date:   Fri Jun 30 10:29:23 2017 -0700

isl: Don't use surface format R32_FLOAT for typed atomic integer operations

>From Skylake PRM Surface Formats section:

   "The surface format for the typed atomic integer operations must
    be R32_UINT or R32_SINT."

Fixes an error and a piglit GPU hang in simulation environment.
Piglit test: gl45-imageAtomicExchange-float.shader_test

Suggested-by: Francisco Jerez <currojerez at riseup.net>
Signed-off-by: Anuj Phogat <anuj.phogat at gmail.co
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
Cc: "18.0 17.3" <mesa-stable at lists.freedesktop.org>

---

 src/intel/isl/isl_storage_image.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/intel/isl/isl_storage_image.c b/src/intel/isl/isl_storage_image.c
index a8aebce6d4..20f6fd5faf 100644
--- a/src/intel/isl/isl_storage_image.c
+++ b/src/intel/isl/isl_storage_image.c
@@ -88,9 +88,16 @@ isl_lower_storage_image_format(const struct gen_device_info *devinfo,
    case ISL_FORMAT_R32G32B32A32_FLOAT:
    case ISL_FORMAT_R32_UINT:
    case ISL_FORMAT_R32_SINT:
-   case ISL_FORMAT_R32_FLOAT:
       return format;
 
+   /* The Skylake PRM's "Surface Formats" section says:
+    *
+    *   "The surface format for the typed atomic integer operations must
+    *    be R32_UINT or R32_SINT."
+    */
+   case ISL_FORMAT_R32_FLOAT:
+      return ISL_FORMAT_R32_UINT;
+
    /* From HSW to BDW the only 64bpp format supported for typed access is
     * RGBA_UINT16.  IVB falls back to untyped.
     */