Am 04.04.23 um 11:56 schrieb Shane Xiao:
For userptr bo with iommu on, multiple GPUs use same system
memory dma mapping address when both bo_adev and adev in identity
mode or in the same iommu group.
WTF? Userptr BOs are not allowed to be exported/imported between
different GPUs.
So how can the same userptr BO be used on different GPUs?
Regards,
Christian.
Signed-off-by: Shane Xiao <shane.xiao@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index e7403f8e4eba..33cda358cb9e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -804,11 +804,11 @@ static int kfd_mem_attach(struct amdgpu_device *adev, struct kgd_mem *mem,
va + bo_size, vm);
if ((adev == bo_adev && !(mem->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_MMIO_REMAP)) ||
- (amdgpu_ttm_tt_get_usermm(mem->bo->tbo.ttm) && adev->ram_is_direct_mapped) ||
- same_hive) {
+ (amdgpu_ttm_tt_get_usermm(mem->bo->tbo.ttm) && ((adev->ram_is_direct_mapped && bo_adev->ram_is_direct_mapped) ||
+ adev->dev->iommu_group == bo_adev->dev->iommu_group)) || same_hive){
/* Mappings on the local GPU, or VRAM mappings in the
- * local hive, or userptr mapping IOMMU direct map mode
- * share the original BO
+ * local hive, or userptr mapping in the same dma
+ * address space share the original BO
*/
attachment[i]->type = KFD_MEM_ATT_SHARED;
bo[i] = mem->bo;
