From a69f4d4076eab6b88901d41fcf129f14c74eb763 Mon Sep 17 00:00:00 2001 From: Zhigang Luo Date: Mon, 31 Aug 2026 15:39:03 -0400 Subject: [PATCH] drm/amdkfd: mark A+A VF VRAM PTEs as system memory On the A+A VF, VRAM is accessed through the system memory path, so SVM range PTEs that point at VRAM need AMDGPU_PTE_SYSTEM set, matching what the graphics paths already do. v2: - Use (sriov_vf || passthrough) and amdgpu_virt_vram_is_spm() for SVM VRAM PTE_SYSTEM. v3: - Rely on amdgpu_virt_vram_is_spm() without redundant VF/passthrough checks. Signed-off-by: Zhigang Luo Signed-off-by: Fangsheng Huang Signed-off-by: YuBiao Wang Reviewed-by: Philip Yang Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c index 671193fb1203..cfb428c72686 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c @@ -1384,7 +1384,13 @@ svm_range_get_pte_flags(struct kfd_node *node, struct amdgpu_vm *vm, mapping_flags |= AMDGPU_VM_PAGE_EXECUTABLE; pte_flags = AMDGPU_PTE_VALID; - pte_flags |= (domain == SVM_RANGE_VRAM_DOMAIN) ? 0 : AMDGPU_PTE_SYSTEM; + /* SPM-backed VRAM is accessed through the system memory path and + * requires the SYSTEM bit. + */ + if (amdgpu_virt_vram_is_spm(node->adev)) + pte_flags |= AMDGPU_PTE_SYSTEM; + else + pte_flags |= (domain == SVM_RANGE_VRAM_DOMAIN) ? 0 : AMDGPU_PTE_SYSTEM; pte_flags |= snoop ? AMDGPU_PTE_SNOOPED : 0; if (gc_ip_version >= IP_VERSION(12, 0, 0)) pte_flags |= AMDGPU_PTE_IS_PTE;