[PATCH v1 0/4] drm/tyr: implement GPU reset API

[Onur Özkan]

This series adds GPU reset handling support for Tyr in a new module
drivers/gpu/drm/tyr/driver.rs which encapsulates the low-level reset
controller internals and exposes a ResetHandle API to the driver.

The reset module owns reset state, queueing and execution ordering
through OrderedQueue and handles duplicate/concurrent reset requests
with a pending flag.

Apart from the reset module, the first 3 patches:

- Fixes a potential reset-complete stale state bug by clearing completed
  state before doing soft reset.
- Adds Work::disable_sync() (wrapper of bindings::disable_work_sync).
- Adds OrderedQueue support.

Runtime tested on hardware by Deborah Brouwer (see [1]) and myself.

[1]: https://gitlab.freedesktop.org/panfrost/linux/-/merge_requests/63#note_3364131

Link: https://gitlab.freedesktop.org/panfrost/linux/-/issues/28
---

Onur Özkan (4):
  drm/tyr: clear reset IRQ before soft reset
  rust: add Work::disable_sync
  rust: add ordered workqueue wrapper
  drm/tyr: add GPU reset handling

 drivers/gpu/drm/tyr/driver.rs |  38 +++----
 drivers/gpu/drm/tyr/reset.rs  | 180 ++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/tyr/tyr.rs    |   1 +
 rust/helpers/workqueue.c      |   6 ++
 rust/kernel/workqueue.rs      |  62 ++++++++++++
 5 files changed, 260 insertions(+), 27 deletions(-)
 create mode 100644 drivers/gpu/drm/tyr/reset.rs


base-commit: 0ccc0dac94bf2f5c6eb3e9e7f1014cd9dddf009f
-- 
2.51.2