From fd83fc4bfb75b1c4d028ac3c2395ecb29f37fb53 Mon Sep 17 00:00:00 2001
From: Faith Ekstrand <faith.ekstrand@collabora.com>
Date: Tue, 23 Jul 2024 11:11:08 -0500
Subject: [PATCH] nak: Don't emit barrier ops for shared memory pre-Volta

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28084>
---
 src/nouveau/compiler/nak/from_nir.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/nouveau/compiler/nak/from_nir.rs b/src/nouveau/compiler/nak/from_nir.rs
index 253460ad4b1..411141aa0b6 100644
--- a/src/nouveau/compiler/nak/from_nir.rs
+++ b/src/nouveau/compiler/nak/from_nir.rs
@@ -3148,7 +3148,8 @@ impl<'a> ShaderFromNir<'a> {
         let sm = self.sm;
         let mut b = SSAInstrBuilder::new(sm, ssa_alloc);
 
-        if nb.index == 0 && self.nir.info.shared_size > 0 {
+        if self.sm.sm() >= 70 && nb.index == 0 && self.nir.info.shared_size > 0
+        {
             // The blob seems to always do a BSYNC before accessing shared
             // memory.  Perhaps this is to ensure that our allocation is
             // actually available and not in use by another thread?