[RFC 0/6] Define and use reset domain for GPU recovery in amdgpu

[Andrey Grodzovsky <andrey.grodzovsky@amd.com>]

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.

[1] https://patchwork.kernel.org/project/dri-devel/patch/20210629073510.2764391-3-boris.brezillon@collabora.com/

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

Andrey Grodzovsky (6):
  drm/amdgpu: Init GPU reset single threaded wq
  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/amdgpu: Drop hive->in_reset
  drm/amdgpu: Drop concurrent GPU reset protection for device

 drivers/gpu/drm/amd/amdgpu/amdgpu.h        |   9 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 206 +++++++++++----------
 drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c  |  36 +---
 drivers/gpu/drm/amd/amdgpu/amdgpu_job.c    |   2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h   |   2 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c   |  10 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.h   |   3 +-
 7 files changed, 132 insertions(+), 136 deletions(-)

-- 
2.25.1