From 28fe416466f2f09b47a9c5e81fa1ac140512f3d5 Mon Sep 17 00:00:00 2001 From: Philip Yang Date: Mon, 6 Dec 2021 21:17:14 -0500 Subject: [PATCH] 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: Philip Yang Reviewed-by: Felix Kuehling Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 10 ++++++---- 1 file changed, 6 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 b8490789eef4..f9bab963a948 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c @@ -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;