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intel/fs: Work around dual-source blending hangs in combination with SIMD16

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It was found that dual-source blending hangs with SIMD16 dispatch in some
specific but unknown situation. Which in the wild happen when rgba
anti-aliasing is enabled for fonts.

Cc: <mesa-stable@lists.freedesktop.org>
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/2183
Signed-off-by: Danylo Piliaiev <danylo.piliaiev@globallogic.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5037>
(cherry picked from commit 296c04d78c)
This commit is contained in:
Danylo Piliaiev 2020-05-14 15:29:36 +03:00 • committed by Eric Engestrom
parent d043d24654
commit e81c43540c
2 changed files with 7 additions and 3 deletions
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2
.pick_status.json
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@ -13,7 +13,7 @@
"description": "intel/fs: Work around dual-source blending hangs in combination with SIMD16",
"nominated": true,
"nomination_type": 0,
"resolution": 0,
"resolution": 1,
"master_sha": null,
"because_sha": null
},

8
src/intel/compiler/brw_fs_visitor.cpp
View file

@ -548,9 +548,13 @@ fs_visitor::emit_fb_writes()
* XXX - Emit an extra single-source NULL RT-write marked LastRT in
* order to release the thread dependency without disabling
* SIMD32.
*
* The dual-source RT write messages may lead to hangs with SIMD16
* dispatch on ICL due some unknown reasons, see
* https://gitlab.freedesktop.org/mesa/mesa/-/issues/2183
*/
limit_dispatch_width(16, "Dual source blending unsupported "
"in SIMD32 mode.\n");
limit_dispatch_width(8, "Dual source blending unsupported "
"in SIMD16 and SIMD32 modes.\n");
}
}