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drm/amdgpu: Restore uncached behaviour on GFX12

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Always use MTYPE_UC if UNCACHED flag is specified.

This makes kernarg region uncached and it restores
usermode cache disable debug flag functionality.

Do not set MTYPE_UC for COHERENT flag, on GFX12 coherence is handled by
shader code.

Signed-off-by: David Belanger <david.belanger@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
David Belanger
2024-07-02 17:56:41 -04:00
committed by Alex Deucher
parent ebdc52607a
commit eb6cdfb807
2 changed files with 3 additions and 27 deletions
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8
drivers/gpu/drm/amd/amdkfd/kfd_svm.c
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@@ -1287,13 +1287,7 @@ svm_range_get_pte_flags(struct kfd_node *node,
break;
case IP_VERSION(12, 0, 0):
case IP_VERSION(12, 0, 1):
if (domain == SVM_RANGE_VRAM_DOMAIN) {
if (bo_node != node)
mapping_flags |= AMDGPU_VM_MTYPE_NC;
} else {
mapping_flags |= coherent ?
AMDGPU_VM_MTYPE_UC : AMDGPU_VM_MTYPE_NC;
}
mapping_flags |= AMDGPU_VM_MTYPE_NC;
break;
default:
mapping_flags |= coherent ?