drm/amdkfd: Preserve v1 in gfx12.1 trap workaround

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If MODE.DST_VGPR_MSB != MODE.SRC0_VGPR_MSB upon trap entry then
v1 would be trashed.

Adjust workaround to prefetch random address 0xFFFFFFFFxxxxxxxx.
This address space is unavailable to userspace on gfx12.1, ensuring
no functional side-effects of prefetch.

Also remove unused WAVE_START exception handler.

Fixes: 0e1e0f87af ("drm/amdkfd: gfx12.1 add no-op prefetch on trap entry")
Signed-off-by: Jay Cornwall <jay.cornwall@amd.com>
Reviewed-by: Lancelot Six <lancelot.six@amd.com>
Cc: Joseph Greathouse <joseph.greathouse@amd.com>
Cc: Vladimir Indic <vladimir.indic@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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This commit is contained in:

Jay Cornwall 2026-09-17 18:06:19 -05:00 • committed by Alex Deucher

parent fc6275c7fc

commit 57ec117d62

2 changed files with 626 additions and 647 deletions

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1262

drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler.h

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23

drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler_gfx12.asm

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