Commit 28fe4164 authored by Philip Yang's avatar Philip Yang Committed by Alex Deucher
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drm/amdgpu: Reduce SG bo memory usage for mGPUs 



For userptr bo, if adev is not in IOMMU isolation mode, RAM direct map
to GPU, multiple GPUs use same system memory dma mapping address, they
can share the original mem->bo in attachment to reduce dma address array
memory usage.

Signed-off-by: default avatarPhilip Yang <Philip.Yang@amd.com>
Reviewed-by: default avatarFelix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 4a74c38c

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

+6 −4
Original line number Diff line number Diff line
@@ -708,10 +708,12 @@ static int kfd_mem_attach(struct amdgpu_device *adev, struct kgd_mem *mem, 
		pr_debug("\t add VA 0x%llx - 0x%llx to vm %p\n", va,

			 va + bo_size, vm);



		if (adev == bo_adev || (mem->domain == AMDGPU_GEM_DOMAIN_VRAM &&

					amdgpu_xgmi_same_hive(adev, bo_adev))) {

			/* Mappings on the local GPU and VRAM mappings in the

			 * local hive share the original BO

		if (adev == bo_adev ||

		   (amdgpu_ttm_tt_get_usermm(mem->bo->tbo.ttm) && adev->ram_is_direct_mapped) ||

		   (mem->domain == AMDGPU_GEM_DOMAIN_VRAM && amdgpu_xgmi_same_hive(adev, bo_adev))) {

			/* Mappings on the local GPU, or VRAM mappings in the

			 * local hive, or userptr mapping IOMMU direct map mode

			 * share the original BO

			 */

			attachment[i]->type = KFD_MEM_ATT_SHARED;

			bo[i] = mem->bo;