[PATCH v4 0/5] Auxiliary bus Rust abstractions

Danilo Krummrich
2025-04-14T13:19:40Z

This series adds Rust abstractions for the auxiliary bus.

It implements the required abstractions to write auxiliary drivers and create
auxiliary device registrations. A driver sample illustrates how the
corresponding abstractions work.

The auxiliary abstractions are required for the Nova driver project, in order to
connect nova-core with the nova-drm driver.

A branch containing the patches can be found in [1].

[1] https://web.git.kernel.org/pub/scm/linux/kernel/git/dakr/linux.git/log/?h=rust/auxiliary

Changes in v4:
- drop TryFrom<&Device> for &auxiliary::Device for now; we likely don't need
it anytime soon
- sample: rename PciDriver to ParentDriver; add connect() to ParentDriver
- rebase onto https://lore.kernel.org/rust-for-linux/20250413173758.12068-1-dakr@kernel.org/

Changes in v3:
- export auxiliary_bus_type
- implement impl TryFrom<&Device> for &auxiliary::Device
- implement Send + Sync for Registration and Device

Changes in v2:
- implement bus device soundness improvements from [2]

Danilo Krummrich (5):
rust: types: add `Opaque::zeroed`
rust: device: implement Device::parent()
rust: auxiliary: add auxiliary device / driver abstractions
rust: auxiliary: add auxiliary registration
samples: rust: add Rust auxiliary driver sample

MAINTAINERS | 3 +
rust/bindings/bindings_helper.h | 1 +
rust/helpers/auxiliary.c | 23 ++
rust/helpers/helpers.c | 1 +
rust/kernel/auxiliary.rs | 360 ++++++++++++++++++++++++++
rust/kernel/device.rs | 18 ++
rust/kernel/lib.rs | 2 +
rust/kernel/types.rs | 8 +
samples/rust/Kconfig | 12 +
samples/rust/Makefile | 1 +
samples/rust/rust_driver_auxiliary.rs | 122 +++++++++
11 files changed, 551 insertions(+)
create mode 100644 rust/helpers/auxiliary.c
create mode 100644 rust/kernel/auxiliary.rs
create mode 100644 samples/rust/rust_driver_auxiliary.rs

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2.49.0