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radv: switch to the full HiZ workaround by default on GFX12

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The full HiZ workaround is the only one that fixes the issue reliably.

Sadly, the performance results are mixed and sometimes it hurts. To
maintain performance, RADV will opt-in by selecting which workarounds
to apply from drirc.

As we can't know the full list of games that will be affected by a
potential performance regression, users are encouraged to try with
RADV_GFX12_HIZ_WA (see Mesa documentation for more explanations).

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36174>
This commit is contained in:
Samuel Pitoiset 2025-07-14 15:26:16 +02:00 • committed by Marge Bot
parent 5f8f4686bf
commit ec09ac1501
2 changed files with 3 additions and 2 deletions
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3
docs/envvars.rst
View file

@ -1658,9 +1658,10 @@ RADV driver environment variables
no HiZ workaround is enabled, use at your own risk but optimal for performance
``partial``
mitigate the issue partially, potentially risky but performance should be
mostly optimal (default value)
mostly optimal
``full``
mitigate the issue completely, no risk but performance might be decreased
(default value)
RadeonSI driver environment variables
-------------------------------------

2
src/amd/vulkan/radv_physical_device.c
View file

@ -2315,7 +2315,7 @@ radv_physical_device_try_create(struct radv_instance *instance, drmDevicePtr drm
if (pdev->info.gfx_level == GFX12) {
const char *gfx12_hiz_wa_str = instance->drirc.performance.gfx12_hiz_wa;
pdev->gfx12_hiz_wa = RADV_GFX12_HIZ_WA_PARTIAL; /* Default */
pdev->gfx12_hiz_wa = RADV_GFX12_HIZ_WA_FULL; /* Default */
if (strlen(gfx12_hiz_wa_str) > 0) {
if (!strcmp(gfx12_hiz_wa_str, "disabled")) {