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SubjectRe: [RFC PATCH 02/11] rust: add driver abstraction
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On 20.05.2024 19:25, Danilo Krummrich wrote:
> From: Wedson Almeida Filho <wedsonaf@gmail.com>
>
> This defines general functionality related to registering drivers with
> their respective subsystems, and registering modules that implement
> drivers.
>
> Co-developed-by: Asahi Lina <lina@asahilina.net>
> Signed-off-by: Asahi Lina <lina@asahilina.net>
> Co-developed-by: Andreas Hindborg <a.hindborg@samsung.com>
> Signed-off-by: Andreas Hindborg <a.hindborg@samsung.com>
> Signed-off-by: Wedson Almeida Filho <wedsonaf@gmail.com>
> Signed-off-by: Danilo Krummrich <dakr@redhat.com>
> ---
> rust/kernel/driver.rs | 492 +++++++++++++++++++++++++++++++++++
> rust/kernel/lib.rs | 4 +-
> rust/macros/module.rs | 2 +-
> samples/rust/rust_minimal.rs | 2 +-
> samples/rust/rust_print.rs | 2 +-
> 5 files changed, 498 insertions(+), 4 deletions(-)
> create mode 100644 rust/kernel/driver.rs
>
> diff --git a/rust/kernel/driver.rs b/rust/kernel/driver.rs
> new file mode 100644
> index 000000000000..e0cfc36d47ff
> --- /dev/null
> +++ b/rust/kernel/driver.rs
> @@ -0,0 +1,492 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +//! Generic support for drivers of different buses (e.g., PCI, Platform, Amba, etc.).
> +//!
> +//! Each bus/subsystem is expected to implement [`DriverOps`], which allows drivers to register
> +//! using the [`Registration`] class.
> +
> +use crate::{
> + alloc::{box_ext::BoxExt, flags::*},
> + error::code::*,
> + error::Result,
> + str::CStr,
> + sync::Arc,
> + ThisModule,
> +};
> +use alloc::boxed::Box;
> +use core::{cell::UnsafeCell, marker::PhantomData, ops::Deref, pin::Pin};
> +
> +/// A subsystem (e.g., PCI, Platform, Amba, etc.) that allows drivers to be written for it.
> +pub trait DriverOps {
> + /// The type that holds information about the registration. This is typically a struct defined
> + /// by the C portion of the kernel.
> + type RegType: Default;
> +
> + /// Registers a driver.
> + ///
> + /// # Safety
> + ///
> + /// `reg` must point to valid, initialised, and writable memory. It may be modified by this
> + /// function to hold registration state.
> + ///
> + /// On success, `reg` must remain pinned and valid until the matching call to
> + /// [`DriverOps::unregister`].
> + unsafe fn register(
> + reg: *mut Self::RegType,
> + name: &'static CStr,
> + module: &'static ThisModule,
> + ) -> Result;
> +
> + /// Unregisters a driver previously registered with [`DriverOps::register`].
> + ///
> + /// # Safety
> + ///
> + /// `reg` must point to valid writable memory, initialised by a previous successful call to
> + /// [`DriverOps::register`].
> + unsafe fn unregister(reg: *mut Self::RegType);
> +}
> +
> +/// The registration of a driver.
> +pub struct Registration<T: DriverOps> {
> + is_registered: bool,
> + concrete_reg: UnsafeCell<T::RegType>,
> +}
> +
> +// SAFETY: `Registration` has no fields or methods accessible via `&Registration`, so it is safe to
> +// share references to it with multiple threads as nothing can be done.
> +unsafe impl<T: DriverOps> Sync for Registration<T> {}


You might want to check if we additionally need 'Send' due to

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=323617f649c0966ad5e741e47e27e06d3a680d8f

here?

+ unsafe impl<T: DriverOps> Send for Registration<T> {}

This was found re-basing

https://github.com/Rust-for-Linux/linux/commits/staging/rust-device/

to v6.10-rc1.

Sorry if I missed anything ;)

Best regards

Dirk


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