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drm/amdgpu: Reduce SG bo memory usage for mGPUs

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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 <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Philip Yang 2021-12-06 21:17:14 -05:00 • committed by Alex Deucher
parent 4a74c38cd6
commit 28fe416466
1 changed files with 6 additions and 4 deletions
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10
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
View file

@ -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;