From 0737b37dcd53a734b4efd2d1fca711d78356054d Mon Sep 17 00:00:00 2001
From: Jason Ekstrand <jason@jlekstrand.net>
Date: Wed, 15 Sep 2021 16:24:22 -0500
Subject: [PATCH] intel/fs: Emit URB fences when we have LSC

Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Tested-by: Sagar Ghuge <sagar.ghuge@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13092>
---
 src/intel/compiler/brw_fs_nir.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/intel/compiler/brw_fs_nir.cpp b/src/intel/compiler/brw_fs_nir.cpp
index 5a02f48e8fd..c4306f10c6a 100644
--- a/src/intel/compiler/brw_fs_nir.cpp
+++ b/src/intel/compiler/brw_fs_nir.cpp
@@ -4526,7 +4526,11 @@ fs_visitor::nir_emit_intrinsic(const fs_builder &bld, nir_intrinsic_instr *instr
          }
 
          if (urb_fence) {
-            unreachable("TODO: Emit a URB barrier message");
+            assert(opcode == SHADER_OPCODE_MEMORY_FENCE);
+            fence_regs[fence_regs_count++] =
+               emit_fence(ubld, opcode, BRW_SFID_URB,
+                          true /* commit_enable */,
+                          0 /* BTI; ignored for LSC */);
          }
       } else if (devinfo->ver >= 11) {
          if (tgm_fence || ugm_fence || urb_fence) {