This patch series fixes DMA-mappings of system memory (GTT and userptr) for KFD running on multi-GPU systems with IOMMU enabled. One SG-BO per GPU is needed to maintain the DMA mappings of each BO.
I ran into some reservation issues when unmapping or freeing DMA-buf imports. There are a few FIXME comments in this patch series where I'm hoping for some expert advice. Patches 8 and 9 are some related fixes in TTM and amdgpu_ttm. I'm pretty sure patch 9 is not the right way to do this.
Felix Kuehling (9): drm/amdgpu: Rename kfd_bo_va_list to kfd_mem_attachment drm/amdgpu: Keep a bo-reference per-attachment drm/amdgpu: Simplify AQL queue mapping drm/amdgpu: Add multi-GPU DMA mapping helpers drm/amdgpu: DMA map/unmap when updating GPU mappings drm/amdgpu: Move kfd_mem_attach outside reservation drm/amdgpu: Add DMA mapping of GTT BOs drm/ttm: Don't count pages in SG BOs against pages_limit drm/amdgpu: Lock the attached dmabuf in unpopulate
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h | 18 +- .../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 535 ++++++++++++------ drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 13 + drivers/gpu/drm/ttm/ttm_tt.c | 27 +- 4 files changed, 420 insertions(+), 173 deletions(-)