linux-kernel - [RFC PATCH 00/11] [RFC] Device / Driver and PCI Rust abstractions

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Date: Mon, 20 May 2024 19:25:37 +0200
From: Danilo Krummrich <dakr@...hat.com>
To: gregkh@...uxfoundation.org,
	rafael@...nel.org,
	bhelgaas@...gle.com,
	ojeda@...nel.org,
	alex.gaynor@...il.com,
	wedsonaf@...il.com,
	boqun.feng@...il.com,
	gary@...yguo.net,
	bjorn3_gh@...tonmail.com,
	benno.lossin@...ton.me,
	a.hindborg@...sung.com,
	aliceryhl@...gle.com,
	airlied@...il.com,
	fujita.tomonori@...il.com,
	lina@...hilina.net,
	pstanner@...hat.com,
	ajanulgu@...hat.com,
	lyude@...hat.com
Cc: rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org,
	Danilo Krummrich <dakr@...hat.com>
Subject: [RFC PATCH 00/11] [RFC] Device / Driver and PCI Rust abstractions

This patch sereis implements basic generic device / driver Rust abstractions,
as well as some basic PCI abstractions.

This patch series is sent in the context of [1], and the corresponding patch
series [2], which contains some basic DRM Rust abstractions and a stub
implementation of the Nova GPU driver.

Nova is intended to be developed upstream, starting out with just a stub driver
to lift some initial required infrastructure upstream. A more detailed
explanation can be found in [1].

Some patches, which implement the generic device / driver Rust abstractions have
been sent a couple of weeks ago already [3]. For those patches the following
changes have been made since then:

- remove RawDevice::name()
- remove rust helper for dev_name() and dev_get_drvdata()
- use AlwaysRefCounted for struct Device
- drop trait RawDevice entirely in favor of AsRef and provide
  Device::from_raw(), Device::as_raw() and Device::as_ref() instead
- implement RevocableGuard
- device::Data, remove resources and replace it with a Devres abstraction
- implement Devres abstraction for resources

As mentioned above, a driver serving as example on how these abstractions are
used within a (DRM) driver can be found in [2].

Additionally, the device / driver bits can also be found in [3], all
abstractions required for Nova in [4] and Nova in [5].

[1] https://lore.kernel.org/dri-devel/Zfsj0_tb-0-tNrJy@cassiopeiae/T/#u
[2] https://lore.kernel.org/dri-devel/20240520172059.181256-1-dakr@redhat.com/
[3] https://github.com/Rust-for-Linux/linux/tree/staging/rust-device
[4] https://github.com/Rust-for-Linux/linux/tree/staging/dev
[5] https://gitlab.freedesktop.org/drm/nova/-/tree/nova-next

Danilo Krummrich (2):
  rust: add abstraction for struct device
  rust: add devres abstraction

FUJITA Tomonori (1):
  rust: add basic PCI driver abstractions

Philipp Stanner (2):
  rust: add basic abstractions for iomem operations
  rust: PCI: add BAR request and ioremap

Wedson Almeida Filho (6):
  rust: add driver abstraction
  rust: add rcu abstraction
  rust: add revocable mutex
  rust: add revocable objects
  rust: add device::Data
  rust: add `dev_*` print macros.

 rust/bindings/bindings_helper.h |   1 +
 rust/helpers.c                  | 145 ++++++++++
 rust/kernel/device.rs           | 498 ++++++++++++++++++++++++++++++++
 rust/kernel/devres.rs           | 151 ++++++++++
 rust/kernel/driver.rs           | 492 +++++++++++++++++++++++++++++++
 rust/kernel/iomem.rs            | 135 +++++++++
 rust/kernel/lib.rs              |  10 +-
 rust/kernel/pci.rs              | 449 ++++++++++++++++++++++++++++
 rust/kernel/prelude.rs          |   2 +
 rust/kernel/revocable.rs        | 441 ++++++++++++++++++++++++++++
 rust/kernel/sync.rs             |   3 +
 rust/kernel/sync/rcu.rs         |  52 ++++
 rust/kernel/sync/revocable.rs   | 148 ++++++++++
 rust/macros/module.rs           |   2 +-
 samples/rust/rust_minimal.rs    |   2 +-
 samples/rust/rust_print.rs      |   2 +-
 16 files changed, 2529 insertions(+), 4 deletions(-)
 create mode 100644 rust/kernel/device.rs
 create mode 100644 rust/kernel/devres.rs
 create mode 100644 rust/kernel/driver.rs
 create mode 100644 rust/kernel/iomem.rs
 create mode 100644 rust/kernel/pci.rs
 create mode 100644 rust/kernel/revocable.rs
 create mode 100644 rust/kernel/sync/rcu.rs
 create mode 100644 rust/kernel/sync/revocable.rs


base-commit: 97ab3e8eec0ce79d9e265e6c9e4c480492180409
-- 
2.45.1