Re: [PATCH 0/6] Enable KFD to use render node BO mappings

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Am 12.01.23 um 02:31 schrieb Felix Kuehling:
Rebased on latest amd-staging-drm-next. This is meant to be the final
review of this series, assuming no more issues are found.

This patch series enables KFD to interoperate more closely with DRM render
nodes. ROCm user mode already uses DRM render nodes to create its GPU VM
contexts and to CPU-map its GEM buffer objects. This patch series adds an
API to let KFD export its BOs as DMABufs, so they can be imported into
the DRM render nodes. This enables more flexible virtual memory mappings
using DRM_IOCTL_AMDGPU_GEM_VA.

Patches 1 and 2 deal with the exporting and importing of DMABufs.

The remaining patches let KFD validate and update GPUVM mappings managed
through render nodes.

The user mode side of this patch series can be seen in libhsakmt and
KFDTest where we improve integration with libdrm (initializing
amdgpu_device instances) to enable DMABuf imports into the render nodes
representing KFD GPU VM contexts. KFDTest is modified to test evictions
and validations of BOs mapped through amdgpu_bo_va_op:
https://github.com/fxkamd/ROCT-Thunk-Interface/commits/fxkamd/dmabuf

As a consequence, applications using Mesa and ROCm in the same process on
the same GPU will now share a single render node FD and GPUVM address
space.

The DMABuf export API will also be used later for upstream IPC and RDMA
implementations.

Nice, I don't have time to check everything in detail but at least from a high level skimming over this I can't see anything obvious wrong.

Feel free to add an Acked-by: Christian König <christian.koenig@xxxxxxx> to the series.

Christian.


Felix Kuehling (6):
   drm/amdgpu: Generalize KFD dmabuf import
   drm/amdkfd: Implement DMA buf fd export from KFD
   drm/amdkfd: Improve amdgpu_vm_handle_moved
   drm/amdgpu: Attach eviction fence on alloc
   drm/amdgpu: update mappings not managed by KFD
   drm/amdgpu: Do bo_va ref counting for KFD BOs

  drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h    |   2 +
  .../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c  | 196 ++++++++++++------
  drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c        |   6 +-
  drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c   |   2 +-
  drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c        |  18 +-
  drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h        |   3 +-
  drivers/gpu/drm/amd/amdkfd/kfd_chardev.c      |  55 +++++
  include/uapi/linux/kfd_ioctl.h                |  14 +-
  8 files changed, 219 insertions(+), 77 deletions(-)





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