On 20.05.2024 19:25, Danilo Krummrich wrote:
From: Wedson Almeida Filho <wedsonaf@xxxxxxxxx>
This defines general functionality related to registering drivers with
their respective subsystems, and registering modules that implement
drivers.
Co-developed-by: Asahi Lina <lina@xxxxxxxxxxxxx>
Signed-off-by: Asahi Lina <lina@xxxxxxxxxxxxx>
Co-developed-by: Andreas Hindborg <a.hindborg@xxxxxxxxxxx>
Signed-off-by: Andreas Hindborg <a.hindborg@xxxxxxxxxxx>
Signed-off-by: Wedson Almeida Filho <wedsonaf@xxxxxxxxx>
Signed-off-by: Danilo Krummrich <dakr@xxxxxxxxxx>
---
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
