[PATCH v2 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.

This series is based on Alice's "Creation of workqueues in Rust" [1]
series.

Changes since v1:
  - Removed OrderedQueue and using Alice's workqueue implementation [1] instead.
  - Added Resettable trait with pre_reset and post_reset hooks to be implemented by
    reset-managed hardwares.
  - Added SRCU abstraction and used it to synchronize the reset work and hardware access.

3 important points:
  - There is no hardware using this API yet.
  - On post_reset() failure, we don't do anything for now. We should unplug the GPU (that's
    what Panthor does) but we don't have the infrastructure for that yet (see [2]).
  - In schedule(), similar to panthor_device_schedule_reset(), we should have a PM check
    but similar to the note above, we don't have the infrastructure for that yet.

Link: https://lore.kernel.org/all/20260312-create-workqueue-v4-0-ea39c351c38f@xxxxxxxxxx/ [1]
Link: https://gitlab.freedesktop.org/panfrost/linux/-/work_items/29#note_3391826 [2]
Link: https://gitlab.freedesktop.org/panfrost/linux/-/issues/28

Onur Özkan (4):
  rust: add SRCU abstraction
  MAINTAINERS: add Rust SRCU files to SRCU entry
  rust: add Work::disable_sync
  drm/tyr: add reset management API

 MAINTAINERS                          |   3 +
 drivers/gpu/drm/tyr/driver.rs        |  40 +---
 drivers/gpu/drm/tyr/reset.rs         | 293 +++++++++++++++++++++++++++
 drivers/gpu/drm/tyr/reset/hw_gate.rs | 155 ++++++++++++++
 drivers/gpu/drm/tyr/tyr.rs           |   1 +
 rust/helpers/helpers.c               |   1 +
 rust/helpers/srcu.c                  |  18 ++
 rust/kernel/sync.rs                  |   2 +
 rust/kernel/sync/srcu.rs             | 109 ++++++++++
 rust/kernel/workqueue/mod.rs         |  15 ++
 10 files changed, 607 insertions(+), 30 deletions(-)
 create mode 100644 drivers/gpu/drm/tyr/reset.rs
 create mode 100644 drivers/gpu/drm/tyr/reset/hw_gate.rs
 create mode 100644 rust/helpers/srcu.c
 create mode 100644 rust/kernel/sync/srcu.rs

-- 
2.51.2