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* [PATCH] drm/amdkfd: Fix instruction hazard in gfx12 trap handler
@ 2025-02-06 21:53 Jay Cornwall
  0 siblings, 0 replies; only message in thread
From: Jay Cornwall @ 2025-02-06 21:53 UTC (permalink / raw)
  To: amd-gfx; +Cc: Jay Cornwall, Lancelot Six

VALU instructions with SGPR source need wait states to avoid hazard
with later instructions.

Signed-off-by: Jay Cornwall <jay.cornwall@amd.com>
Cc: Lancelot Six <lancelot.six@amd.com>
---
 .../gpu/drm/amd/amdkfd/cwsr_trap_handler.h    | 406 ++++++++++++++++--
 .../amd/amdkfd/cwsr_trap_handler_gfx12.asm    |  13 +
 2 files changed, 392 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler.h b/drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler.h
index 651660958e5b..112f28ff0018 100644
--- a/drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler.h
+++ b/drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler.h
@@ -3644,7 +3644,7 @@ static const uint32_t cwsr_trap_gfx9_4_3_hex[] = {
 };
 
 static const uint32_t cwsr_trap_gfx12_hex[] = {
-	0xbfa00001, 0xbfa0024b,
+	0xbfa00001, 0xbfa0050b,
 	0xb0804009, 0xb8f8f804,
 	0x9178ff78, 0x00008c00,
 	0xb8fbf811, 0x8b6eff78,
@@ -3718,7 +3718,15 @@ static const uint32_t cwsr_trap_gfx12_hex[] = {
 	0x00011677, 0xd7610000,
 	0x00011a79, 0xd7610000,
 	0x00011c7e, 0xd7610000,
-	0x00011e7f, 0xbefe00ff,
+	0x00011e7f, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xbefe00ff,
 	0x00003fff, 0xbeff0080,
 	0xee0a407a, 0x000c0000,
 	0x00004000, 0xd760007a,
@@ -3759,33 +3767,153 @@ static const uint32_t cwsr_trap_gfx12_hex[] = {
 	0xbf94fffe, 0xb8faf804,
 	0x8b7a847a, 0x91788478,
 	0x8c787a78, 0xd7610002,
-	0x0000fa71, 0x807d817d,
+	0x0000fa71, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0x807d817d,
 	0xd7610002, 0x0000fa6c,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
 	0x807d817d, 0x917aff6d,
 	0x80000000, 0xd7610002,
-	0x0000fa7a, 0x807d817d,
+	0x0000fa7a, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0x807d817d,
 	0xd7610002, 0x0000fa6e,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
 	0x807d817d, 0xd7610002,
-	0x0000fa6f, 0x807d817d,
+	0x0000fa6f, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0x807d817d,
 	0xd7610002, 0x0000fa78,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
 	0x807d817d, 0xb8faf811,
 	0xd7610002, 0x0000fa7a,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
 	0x807d817d, 0xd7610002,
-	0x0000fa7b, 0x807d817d,
+	0x0000fa7b, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0x807d817d,
 	0xb8f1f801, 0xd7610002,
-	0x0000fa71, 0x807d817d,
+	0x0000fa71, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0x807d817d,
 	0xb8f1f814, 0xd7610002,
-	0x0000fa71, 0x807d817d,
+	0x0000fa71, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0x807d817d,
 	0xb8f1f815, 0xd7610002,
-	0x0000fa71, 0x807d817d,
+	0x0000fa71, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0x807d817d,
 	0xb8f1f812, 0xd7610002,
-	0x0000fa71, 0x807d817d,
+	0x0000fa71, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0x807d817d,
 	0xb8f1f813, 0xd7610002,
-	0x0000fa71, 0x807d817d,
+	0x0000fa71, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0x807d817d,
 	0xb8faf802, 0xd7610002,
-	0x0000fa7a, 0x807d817d,
+	0x0000fa7a, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0x807d817d,
 	0xbefa50c1, 0xbfc70000,
 	0xd7610002, 0x0000fa7a,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
 	0x807d817d, 0xbefe00ff,
 	0x0000ffff, 0xbeff0080,
 	0xc4068070, 0x008ce802,
@@ -3802,57 +3930,281 @@ static const uint32_t cwsr_trap_gfx12_hex[] = {
 	0xbe864106, 0xbe884108,
 	0xbe8a410a, 0xbe8c410c,
 	0xbe8e410e, 0xd7610002,
-	0x0000f200, 0x80798179,
+	0x0000f200, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0x80798179,
 	0xd7610002, 0x0000f201,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
 	0x80798179, 0xd7610002,
-	0x0000f202, 0x80798179,
+	0x0000f202, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0x80798179,
 	0xd7610002, 0x0000f203,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
 	0x80798179, 0xd7610002,
-	0x0000f204, 0x80798179,
+	0x0000f204, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0x80798179,
 	0xd7610002, 0x0000f205,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
 	0x80798179, 0xd7610002,
-	0x0000f206, 0x80798179,
+	0x0000f206, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0x80798179,
 	0xd7610002, 0x0000f207,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
 	0x80798179, 0xd7610002,
-	0x0000f208, 0x80798179,
+	0x0000f208, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0x80798179,
 	0xd7610002, 0x0000f209,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
 	0x80798179, 0xd7610002,
-	0x0000f20a, 0x80798179,
+	0x0000f20a, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0x80798179,
 	0xd7610002, 0x0000f20b,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
 	0x80798179, 0xd7610002,
-	0x0000f20c, 0x80798179,
+	0x0000f20c, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0x80798179,
 	0xd7610002, 0x0000f20d,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
 	0x80798179, 0xd7610002,
-	0x0000f20e, 0x80798179,
+	0x0000f20e, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0x80798179,
 	0xd7610002, 0x0000f20f,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
 	0x80798179, 0xbf06a079,
 	0xbfa10007, 0xc4068070,
 	0x008ce802, 0x00000000,
 	0x8070ff70, 0x00000080,
 	0xbef90080, 0x7e040280,
 	0x807d907d, 0xbf0aff7d,
-	0x00000060, 0xbfa2ffbb,
+	0x00000060, 0xbfa2febb,
 	0xbe804100, 0xbe824102,
 	0xbe844104, 0xbe864106,
 	0xbe884108, 0xbe8a410a,
 	0xd7610002, 0x0000f200,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
 	0x80798179, 0xd7610002,
-	0x0000f201, 0x80798179,
+	0x0000f201, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0x80798179,
 	0xd7610002, 0x0000f202,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
 	0x80798179, 0xd7610002,
-	0x0000f203, 0x80798179,
+	0x0000f203, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0x80798179,
 	0xd7610002, 0x0000f204,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
 	0x80798179, 0xd7610002,
-	0x0000f205, 0x80798179,
+	0x0000f205, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0x80798179,
 	0xd7610002, 0x0000f206,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
 	0x80798179, 0xd7610002,
-	0x0000f207, 0x80798179,
+	0x0000f207, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0x80798179,
 	0xd7610002, 0x0000f208,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
 	0x80798179, 0xd7610002,
-	0x0000f209, 0x80798179,
+	0x0000f209, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0x80798179,
 	0xd7610002, 0x0000f20a,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
+	0xd8500000, 0x00000000,
 	0x80798179, 0xd7610002,
-	0x0000f20b, 0x80798179,
+	0x0000f20b, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0xd8500000,
+	0x00000000, 0x80798179,
 	0xc4068070, 0x008ce802,
 	0x00000000, 0xbefe00c1,
 	0x857d9973, 0x8b7d817d,
diff --git a/drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler_gfx12.asm b/drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler_gfx12.asm
index 7b9d36e5fa43..a952d4d4eeaa 100644
--- a/drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler_gfx12.asm
+++ b/drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler_gfx12.asm
@@ -30,6 +30,7 @@
 #define CHIP_GFX12 37
 
 #define SINGLE_STEP_MISSED_WORKAROUND 1	//workaround for lost TRAP_AFTER_INST exception when SAVECTX raised
+#define HAVE_VALU_SGPR_HAZARD (ASIC_FAMILY == CHIP_GFX12)
 
 var SQ_WAVE_STATE_PRIV_BARRIER_COMPLETE_MASK	= 0x4
 var SQ_WAVE_STATE_PRIV_SCC_SHIFT		= 9
@@ -351,6 +352,7 @@ L_HAVE_VGPRS:
 	v_writelane_b32	v0, ttmp13, 0xD
 	v_writelane_b32	v0, exec_lo, 0xE
 	v_writelane_b32	v0, exec_hi, 0xF
+	valu_sgpr_hazard()
 
 	s_mov_b32	exec_lo, 0x3FFF
 	s_mov_b32	exec_hi, 0x0
@@ -1059,6 +1061,7 @@ end
 function write_hwreg_to_v2(s)
 	// Copy into VGPR for later TCP store.
 	v_writelane_b32	v2, s, m0
+	valu_sgpr_hazard()
 	s_add_u32	m0, m0, 0x1
 end
 
@@ -1067,6 +1070,7 @@ function write_16sgpr_to_v2(s)
 	// Copy into VGPR for later TCP store.
 	for var sgpr_idx = 0; sgpr_idx < 16; sgpr_idx ++
 		v_writelane_b32	v2, s[sgpr_idx], ttmp13
+		valu_sgpr_hazard()
 		s_add_u32	ttmp13, ttmp13, 0x1
 	end
 end
@@ -1075,6 +1079,7 @@ function write_12sgpr_to_v2(s)
 	// Copy into VGPR for later TCP store.
 	for var sgpr_idx = 0; sgpr_idx < 12; sgpr_idx ++
 		v_writelane_b32	v2, s[sgpr_idx], ttmp13
+		valu_sgpr_hazard()
 		s_add_u32	ttmp13, ttmp13, 0x1
 	end
 end
@@ -1128,3 +1133,11 @@ function get_wave_size2(s_reg)
 	s_getreg_b32	s_reg, hwreg(HW_REG_WAVE_STATUS,SQ_WAVE_STATUS_WAVE64_SHIFT,SQ_WAVE_STATUS_WAVE64_SIZE)
 	s_lshl_b32	s_reg, s_reg, S_WAVE_SIZE
 end
+
+function valu_sgpr_hazard
+#if HAVE_VALU_SGPR_HAZARD
+	for var rep = 0; rep < 8; rep ++
+		ds_nop
+	end
+#endif
+end
-- 
2.34.1


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2025-02-06 21:53 [PATCH] drm/amdkfd: Fix instruction hazard in gfx12 trap handler Jay Cornwall

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