[PATCH v5 0/7] Improve GPU Recovery

[Akhil P Oommen]

Recently, I debugged a few device crashes which occured during recovery
after a hangcheck timeout. It looks like there are a few things we can
do to improve our chance at a successful gpu recovery.

First one is to ensure that CX GDSC collapses which clears the internal
states in gpu's CX domain. First 5 patches tries to handle this.

Rest of the patches are to ensure that few internal blocks like CP, GMU
and GBIF are halted properly before proceeding for a snapshot followed by
recovery. Also, handle 'prepare slumber' hfi failure correctly. These
are A6x specific improvements.

This series is rebased on top of v2 version of [1] which is based on
linus's master branch.

[1] https://patchwork.freedesktop.org/series/106860/

Changes in v5:
- Replace devm_reset_control_get_optional() with
devm_reset_control_get_optional_exclusive() (Philipp)

Changes in v4:
- Keep active_submit lock across the suspend & resume (Rob)
- Clear gpu->active_submits to silence a WARN() during runpm suspend (Rob)

Changes in v3:
- Use reset interface from gpucc driver to poll for cx gdsc collapse
  https://patchwork.freedesktop.org/series/106860/
- Use single pm refcount for all active submits

Changes in v2:
- Rebased on msm-next tip

Akhil P Oommen (7):
  drm/msm: Remove unnecessary pm_runtime_get/put
  drm/msm: Take single rpm refcount on behalf of all submits
  drm/msm: Correct pm_runtime votes in recover worker
  drm/msm: Fix cx collapse issue during recovery
  drm/msm/a6xx: Ensure CX collapse during gpu recovery
  drm/msm/a6xx: Improve gpu recovery sequence
  drm/msm/a6xx: Handle GMU prepare-slumber hfi failure

 drivers/gpu/drm/msm/adreno/a6xx.xml.h |  4 ++
 drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 83 ++++++++++++++++++++++-------------
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 43 ++++++++++++++++--
 drivers/gpu/drm/msm/msm_gpu.c         | 21 ++++++---
 drivers/gpu/drm/msm/msm_gpu.h         |  4 ++
 drivers/gpu/drm/msm/msm_ringbuffer.c  |  4 --
 6 files changed, 114 insertions(+), 45 deletions(-)

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2.7.4