Mesa (staging/21.1): aco: fix range checking for SSBO loads/stores with SGPR offset on GFX6-7
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gitlab-mirror at kemper.freedesktop.org
Thu Jun 10 11:32:25 UTC 2021
Module: Mesa
Branch: staging/21.1
Commit: e31f9c0883bf1c8bdf51ce05a72b8609110a2499
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=e31f9c0883bf1c8bdf51ce05a72b8609110a2499
Author: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Date: Mon Jun 7 15:19:59 2021 +0200
aco: fix range checking for SSBO loads/stores with SGPR offset on GFX6-7
GFX6-7 are affected by a hw bug that prevents address clamping to work
correctly when the SGPR offset is used. Use the VGPR offset to fix it.
Fixes various hangs with dEQP-VK.robustness.robustness2.* on Bonaire.
Cc: 21.1 mesa-stable
Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Reviewed-by: Daniel Schürmann <daniel at schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11238>
(cherry picked from commit 3761d994f6de81d151b4709314f6ffc9b59f0908)
---
.pick_status.json | 2 +-
src/amd/compiler/README-ISA.md | 6 ++++++
src/amd/compiler/aco_instruction_selection.cpp | 13 +++++++++++++
3 files changed, 20 insertions(+), 1 deletion(-)
diff --git a/.pick_status.json b/.pick_status.json
index 93a2283095d..32224979ca8 100644
--- a/.pick_status.json
+++ b/.pick_status.json
@@ -751,7 +751,7 @@
"description": "aco: fix range checking for SSBO loads/stores with SGPR offset on GFX6-7",
"nominated": true,
"nomination_type": 0,
- "resolution": 0,
+ "resolution": 1,
"main_sha": null,
"because_sha": null
},
diff --git a/src/amd/compiler/README-ISA.md b/src/amd/compiler/README-ISA.md
index cb9d8da0298..c692fdf7e16 100644
--- a/src/amd/compiler/README-ISA.md
+++ b/src/amd/compiler/README-ISA.md
@@ -160,6 +160,12 @@ finish and then write to vcc (for example, `s_mov_b64 vcc, vcc`) to correct vccz
Currently, we don't do this.
+## SGPR offset on MUBUF prevents addr clamping on SI/CI
+
+[See this LLVM source.](https://github.com/llvm/llvm-project/blob/main/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp#L1917-L1922)
+
+This leads to wrong bounds checking, using a VGPR offset fixes it.
+
## GCN / GFX6 hazards
### VINTRP followed by a read with `v_readfirstlane` or `v_readlane`
diff --git a/src/amd/compiler/aco_instruction_selection.cpp b/src/amd/compiler/aco_instruction_selection.cpp
index 594d195374f..65a23bbda08 100644
--- a/src/amd/compiler/aco_instruction_selection.cpp
+++ b/src/amd/compiler/aco_instruction_selection.cpp
@@ -5049,6 +5049,13 @@ void load_buffer(isel_context *ctx, unsigned num_components, unsigned component_
bool use_smem = dst.type() != RegType::vgpr && (!glc || ctx->options->chip_class >= GFX8) && allow_smem;
if (use_smem)
offset = bld.as_uniform(offset);
+ else {
+ /* GFX6-7 are affected by a hw bug that prevents address clamping to
+ * work correctly when the SGPR offset is used.
+ */
+ if (offset.type() == RegType::sgpr && ctx->options->chip_class < GFX8)
+ offset = as_vgpr(ctx, offset);
+ }
LoadEmitInfo info = {Operand(offset), dst, num_components, component_size, rsrc};
info.glc = glc;
@@ -6230,6 +6237,12 @@ void visit_store_ssbo(isel_context *ctx, nir_intrinsic_instr *instr)
split_buffer_store(ctx, instr, false, RegType::vgpr,
data, writemask, 16, &write_count, write_datas, offsets);
+ /* GFX6-7 are affected by a hw bug that prevents address clamping to work
+ * correctly when the SGPR offset is used.
+ */
+ if (offset.type() == RegType::sgpr && ctx->options->chip_class < GFX8)
+ offset = as_vgpr(ctx, offset);
+
for (unsigned i = 0; i < write_count; i++) {
aco_opcode op = get_buffer_store_op(write_datas[i].bytes());
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