Re: [PATCH v2 0/4] drm/tyr: implement GPU reset API

["Onur Özkan" <work@onurozkan.dev>]

On Thu, 16 Apr 2026 20:17:26 +0300
Onur Özkan <work@onurozkan.dev> wrote:

> 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@google.com/ [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
> 

I messed up when sending the series (part of it was sent as a separate series
[1]. I will resend this properly, sorry for the noise.

[1]: https://lore.kernel.org/all/20260416171728.205141-1-work@onurozkan.dev/

-Onur