linux-kernel - [PATCH v2 0/4] Improve bitfield support in Rust

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Message-Id: <20250903215428.1296517-1-joelagnelf@nvidia.com>
Date: Wed,  3 Sep 2025 17:54:24 -0400
From: Joel Fernandes <joelagnelf@...dia.com>
To: linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	dakr@...nel.org,
	acourbot@...dia.com
Cc: Alistair Popple <apopple@...dia.com>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Boqun Feng <boqun.feng@...il.com>,
	Gary Guo <gary@...yguo.net>,
	bjorn3_gh@...tonmail.com,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	John Hubbard <jhubbard@...dia.com>,
	Joel Fernandes <joelagnelf@...dia.com>,
	Timur Tabi <ttabi@...dia.com>,
	joel@...lfernandes.org,
	Elle Rhumsaa <elle@...thered-steel.dev>,
	Daniel Almeida <daniel.almeida@...labora.com>,
	nouveau@...ts.freedesktop.org,
	rust-for-linux@...r.kernel.org
Subject: [PATCH v2 0/4] Improve bitfield support in Rust

These patches extract and enhance the bitfield support in the register macro
and introduces a new macro called bitstruct which allows to define Rust
structures with bitfields. This is extremely useful as it allows clean Rust
structure definitions without requiring explicit masks and shifts.

See [1] for an example of code I am working on.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git/patch/?id=76797b31facae8f1a1be139412c78568df1da9f3

v1 of the patches is at:
https://lore.kernel.org/all/20250824135954.2243774-1-joelagnelf@nvidia.com/

v1->v2:
* Use build_assert in bitstruct
* Split move and enhance patches for easier review
* Move out of Nova into kernel crate for other drivers like Tyr which will use.
* Miscellaneous cosmetic improvements.

Joel Fernandes (4):
  nova-core: bitstruct: Move bitfield-specific code from register! into
    new macro
  nova-core: bitstruct: Add support for different storage widths
  nova-core: bitstruct: Add support for custom visiblity
  rust: Move register and bitstruct macros out of Nova

 drivers/gpu/nova-core/falcon.rs               |   2 +-
 drivers/gpu/nova-core/falcon/gsp.rs           |   3 +-
 drivers/gpu/nova-core/falcon/sec2.rs          |   2 +-
 drivers/gpu/nova-core/regs.rs                 |   5 +-
 rust/kernel/bitstruct.rs                      | 281 +++++++++++++++
 rust/kernel/lib.rs                            |   2 +
 rust/kernel/prelude.rs                        |   2 +
 .../regs/macros.rs => rust/kernel/register.rs | 339 +++---------------
 8 files changed, 347 insertions(+), 289 deletions(-)
 create mode 100644 rust/kernel/bitstruct.rs
 rename drivers/gpu/nova-core/regs/macros.rs => rust/kernel/register.rs (70%)

-- 
2.34.1