linux-kernel - [PATCH 0/3] rust: miscdevice: Add additional data to MiscDeviceRegistration

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Message-Id: <20250119-b4-rust_miscdevice_registrationdata-v1-0-edbf18dde5fc@gmail.com>
Date: Sun, 19 Jan 2025 23:11:12 +0100
From: Christian Schrefl <chrisi.schrefl@...il.com>
To: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
 Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
 Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
 Benno Lossin <benno.lossin@...ton.me>, 
 Andreas Hindborg <a.hindborg@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
 Trevor Gross <tmgross@...ch.edu>, Arnd Bergmann <arnd@...db.de>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Lee Jones <lee@...nel.org>
Cc: rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Christian Schrefl <chrisi.schrefl@...il.com>
Subject: [PATCH 0/3] rust: miscdevice: Add additional data to
 MiscDeviceRegistration

This set is based on Greg's driver-core-next tree.

Currently there is no good way to pass arbitrary data from the driver to
a miscdevice or to share data between individual handles to a miscdevice in rust.

This series adds additional (generic) data to the MiscDeviceRegistration
for this purpose.

The first patch add the Aliased type.

The second patch implements the changes and fixes the build of the sample.

The third patch changes the rust_misc_device sample to use this to 
share the same data between multiple handles to the miscdevice.

Some discussion on Zulip about the motivation and approach
(Thanks a lot to everyone helping me out with this):
Link: https://rust-for-linux.zulipchat.com/#narrow/channel/288089-General/topic/Passing.20a.20DevRes.20to.20a.20miscdev/near/494553814

Signed-off-by: Christian Schrefl <chrisi.schrefl@...il.com>
---
Christian Schrefl (3):
      rust: add Aliased type
      rust: miscdevice: Add additional data to MiscDeviceRegistration
      rust: miscdevice: adjust the rust_misc_device sample to use RegistrationData.

 rust/kernel/miscdevice.rs        | 37 ++++++++++++++++++++++++++++++-------
 rust/kernel/types.rs             | 40 ++++++++++++++++++++++++++++++++++++++++
 samples/rust/rust_misc_device.rs | 22 ++++++++++++----------
 3 files changed, 82 insertions(+), 17 deletions(-)
---
base-commit: 01b3cb620815fc3feb90ee117d9445a5b608a9f7
change-id: 20250119-b4-rust_miscdevice_registrationdata-a11d88dcb284

Best regards,
-- 
Christian Schrefl <chrisi.schrefl@...il.com>