[PATCH v4 0/4] Add GPU page fault query interface

[Alex Deucher]

This patch set adds support for an application to query GPU
page faults.  It's useful for debugging and there are
vulkan extensions that could make use of this.  Preliminary
user space code which uses this can be found here:
https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23238
https://gitlab.freedesktop.org/mesa/drm/-/merge_requests/298

Note, that I made a small change to the vmhub definition to
decouple it from how the kernel tracks vmhubs so that we have
a consistent user view even if we decide to add more vmhubs
like we recently did for gfx 9.4.3.

I've also pushed the changed to:
https://gitlab.freedesktop.org/agd5f/linux/-/commits/gpu_fault_info_ioctl

Open question, currently we just expose the raw GPU fault status
register value for each GPU so UMDs need GPU specific knowlege to decode
it, although it's largely the same across generations.  One option would be to
translate to a generic GPU independent fault status.  Opinions?

v2:
- Fix spelling typos noted by Guchun
v3:
- Add locking in IOCTL query
- Only update cache if fault status is valid
v4:
- Rebase and resend

Alex Deucher (4):
  drm/amdgpu: add cached GPU fault structure to vm struct
  drm/amdgpu: cache gpuvm fault information for gmc7+
  drm/amdgpu: add new INFO ioctl query for the last GPU page fault
  drm/amdgpu: refine fault cache updates

 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c |  3 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 20 ++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c  | 50 +++++++++++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h  | 31 +++++++++++++--
 drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c  |  3 ++
 drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c  |  3 ++
 drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c   |  3 ++
 drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c   |  3 ++
 drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c   | 11 ++++--
 include/uapi/drm/amdgpu_drm.h           | 16 ++++++++
 10 files changed, 135 insertions(+), 8 deletions(-)

-- 
2.41.0