Reviewed-by: Eric Huang <jinhuieric.huang@xxxxxxx> Regards, Eric On 2023-05-01 16:52, Felix Kuehling wrote:
Don't move DMABuf attachments for PCIe P2P mappings to the SYSTEM domain when unmapping. This avoids triggering eviction fences unnecessarily. Instead do the move to SYSTEM and back to GTT when mapping these attachments to ensure the SG table gets updated after evictions. This may still trigger unnecessary evictions if user mode unmaps and remaps the same BO. However, this is unlikely in real applications. Cc: Eric Huang <jinhuieric.huang@xxxxxxx> Signed-off-by: Felix Kuehling <Felix.Kuehling@xxxxxxx> --- drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c index 1002c7834386..bb8e6f6793c0 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c @@ -530,6 +530,12 @@ kfd_mem_dmamap_dmabuf(struct kfd_mem_attachment *attachment) { struct ttm_operation_ctx ctx = {.interruptible = true}; struct amdgpu_bo *bo = attachment->bo_va->base.bo; + int ret; + + amdgpu_bo_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_CPU); + ret = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx); + if (ret) + return ret;amdgpu_bo_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_GTT);return ttm_bo_validate(&bo->tbo, &bo->placement, &ctx); @@ -662,11 +668,10 @@ kfd_mem_dmaunmap_userptr(struct kgd_mem *mem, static void kfd_mem_dmaunmap_dmabuf(struct kfd_mem_attachment *attachment) { - struct ttm_operation_ctx ctx = {.interruptible = true}; - struct amdgpu_bo *bo = attachment->bo_va->base.bo; - - amdgpu_bo_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_CPU); - ttm_bo_validate(&bo->tbo, &bo->placement, &ctx); + /* This is a no-op. We don't want to trigger eviction fences when + * unmapping DMABufs. Therefore the invalidation (moving to system + * domain) is done in kfd_mem_dmamap_dmabuf. + */ }/**
