drm/amdgpu: Fix GMC v12.1.0 MID1 page fault vmhub selection

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For GMC v12.1.0, the IH cookie NodeID spacing is 8 (MID0=0x0, MID1=0x8),
not 4. The wrong divisor caused NPA page faults (node_id=8) to select
mmhub2 instead of the correct mmhub1.

Fix the divisor from 4 to 8, and add a comment documenting the NodeID
to DIE mapping for reference.

Warn once if page fault from the vmhub but vmhub print fault status
function not initialized because not all hubs are initialized.

Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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Philip Yang 2026-05-01 11:13:00 -04:00 • committed by Alex Deucher

parent 155d09cc41

commit 71ad3f6d66

1 changed files with 23 additions and 1 deletions

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drivers/gpu/drm/amd/amdgpu/gmc_v12_1.c

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