Re: [RFC v3 00/12] Define and use reset domain for GPU recovery in amdgpu

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Just another ping, with Shyun's help I was able to do some smoke testing on XGMI SRIOV system (booting and triggering hive reset)
and for now looks good.

Andrey

On 2022-01-28 14:36, Andrey Grodzovsky wrote:
Just a gentle ping if people have more comments on this patch set ? Especially last 5 patches
as first 7 are exact same as V2 and we already went over them mostly.

Andrey

On 2022-01-25 17:37, Andrey Grodzovsky wrote:
This patchset is based on earlier work by Boris[1] that allowed to have an
ordered workqueue at the driver level that will be used by the different
schedulers to queue their timeout work. On top of that I also serialized
any GPU reset we trigger from within amdgpu code to also go through the same ordered wq and in this way simplify somewhat our GPU reset code so we don't need to protect from concurrency by multiple GPU reset triggeres such as TDR on one
hand and sysfs trigger or RAS trigger on the other hand.

As advised by Christian and Daniel I defined a reset_domain struct such that all the entities that go through reset together will be serialized one against
another.

TDR triggered by multiple entities within the same domain due to the same reason will not be triggered as the first such reset will cancel all the pending resets. This is relevant only to TDR timers and not to triggered resets coming from RAS or SYSFS,
those will still happen after the in flight resets finishes.

v2:
Add handling on SRIOV configuration, the reset notify coming from host
and driver already trigger a work queue to handle the reset so drop this
intermediate wq and send directly to timeout wq. (Shaoyun)

v3:
Lijo suggested puting 'adev->in_gpu_reset' in amdgpu_reset_domain struct. I followed his advise and also moved adev->reset_sem into same place. This
in turn caused to do some follow-up refactor of the original patches
where i decoupled amdgpu_reset_domain life cycle frolm XGMI hive because hive is destroyed and reconstructed for the case of reset the devices in the XGMI hive during probe for SRIOV See [2] while we need the reset sem and gpu_reset flag to always be present. This was attained by adding refcount to amdgpu_reset_domain so each device can safely point to it as long as
it needs.


[1] https://patchwork.kernel.org/project/dri-devel/patch/20210629073510.2764391-3-boris.brezillon@xxxxxxxxxxxxx/
[2] https://www.spinics.net/lists/amd-gfx/msg58836.html

P.S Going through drm-misc-next and not amd-staging-drm-next as Boris work hasn't landed yet there.

P.P.S Patches 8-12 are the refactor on top of the original V2 patchset.

P.P.P.S I wasn't able yet to test the reworked code on XGMI SRIOV system because drm-misc-next fails to load there. Would appriciate if maybe jingwech can try it on his system like he tested V2.

Andrey Grodzovsky (12):
   drm/amdgpu: Introduce reset domain
   drm/amdgpu: Move scheduler init to after XGMI is ready
   drm/amdgpu: Fix crash on modprobe
   drm/amdgpu: Serialize non TDR gpu recovery with TDRs
   drm/amd/virt: For SRIOV send GPU reset directly to TDR queue.
   drm/amdgpu: Drop hive->in_reset
   drm/amdgpu: Drop concurrent GPU reset protection for device
   drm/amdgpu: Rework reset domain to be refcounted.
   drm/amdgpu: Move reset sem into reset_domain
   drm/amdgpu: Move in_gpu_reset into reset_domain
   drm/amdgpu: Rework amdgpu_device_lock_adev
   Revert 'drm/amdgpu: annotate a false positive recursive locking'

  drivers/gpu/drm/amd/amdgpu/amdgpu.h           |  15 +-
  drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c   |  10 +-
  drivers/gpu/drm/amd/amdgpu/amdgpu_device.c    | 275 ++++++++++--------
  drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c     |  43 +--
  drivers/gpu/drm/amd/amdgpu/amdgpu_job.c       |   2 +-
  .../gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c    |  18 +-
  drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c     |  39 +++
  drivers/gpu/drm/amd/amdgpu/amdgpu_reset.h     |  12 +
  drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h      |   2 +
  drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c      |  24 +-
  drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.h      |   3 +-
  drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c        |   6 +-
  drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c         |  14 +-
  drivers/gpu/drm/amd/amdgpu/mxgpu_ai.c         |  19 +-
  drivers/gpu/drm/amd/amdgpu/mxgpu_nv.c         |  19 +-
  drivers/gpu/drm/amd/amdgpu/mxgpu_vi.c         |  11 +-
  16 files changed, 313 insertions(+), 199 deletions(-)




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