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rust: driver: add DEVICE_DRIVER_OFFSET to the DriverLayout trait

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Add an associated const DEVICE_DRIVER_OFFSET to the DriverLayout trait
indicating the offset of the embedded struct device_driver within
Self::DriverType, i.e. the specific driver structs, such as struct
pci_driver or struct platform_driver.

Acked-by: Alice Ryhl <aliceryhl@google.com>
Acked-by: Igor Korotin <igor.korotin.linux@gmail.com>
Link: https://patch.msgid.link/20260107103511.570525-5-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
This commit is contained in:
Danilo Krummrich
2026-01-07 11:35:03 +01:00
parent 0af1a9e462
commit c1d4519e1c
6 changed files with 22 additions and 1 deletions
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3
rust/kernel/auxiliary.rs
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@@ -25,8 +25,11 @@ pub struct Adapter<T: Driver>(T);
// SAFETY:
// - `bindings::auxiliary_driver` is a C type declared as `repr(C)`.
// - `struct auxiliary_driver` embeds a `struct device_driver`.
// - `DEVICE_DRIVER_OFFSET` is the correct byte offset to the embedded `struct device_driver`.
unsafe impl<T: Driver + 'static> driver::DriverLayout for Adapter<T> {
type DriverType = bindings::auxiliary_driver;
const DEVICE_DRIVER_OFFSET: usize = core::mem::offset_of!(Self::DriverType, driver);
}
// SAFETY: A call to `unregister` for a given instance of `DriverType` is guaranteed to be valid if

8
rust/kernel/driver.rs
View File

@@ -107,10 +107,16 @@ use pin_init::{pin_data, pinned_drop, PinInit};
/// # Safety
///
/// Implementors must guarantee that:
/// - `DriverType` is `repr(C)`.
/// - `DriverType` is `repr(C)`,
/// - `DriverType` embeds a valid `struct device_driver` at byte offset `DEVICE_DRIVER_OFFSET`.
pub unsafe trait DriverLayout {
/// The specific driver type embedding a `struct device_driver`.
type DriverType: Default;
/// Byte offset of the embedded `struct device_driver` within `DriverType`.
///
/// This must correspond exactly to the location of the embedded `struct device_driver` field.
const DEVICE_DRIVER_OFFSET: usize;
}
/// The [`RegistrationOps`] trait serves as generic interface for subsystems (e.g., PCI, Platform,

3
rust/kernel/i2c.rs
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@@ -94,8 +94,11 @@ pub struct Adapter<T: Driver>(T);
// SAFETY:
// - `bindings::i2c_driver` is a C type declared as `repr(C)`.
// - `struct i2c_driver` embeds a `struct device_driver`.
// - `DEVICE_DRIVER_OFFSET` is the correct byte offset to the embedded `struct device_driver`.
unsafe impl<T: Driver + 'static> driver::DriverLayout for Adapter<T> {
type DriverType = bindings::i2c_driver;
const DEVICE_DRIVER_OFFSET: usize = core::mem::offset_of!(Self::DriverType, driver);
}
// SAFETY: A call to `unregister` for a given instance of `DriverType` is guaranteed to be valid if

3
rust/kernel/pci.rs
View File

@@ -52,8 +52,11 @@ pub struct Adapter<T: Driver>(T);
// SAFETY:
// - `bindings::pci_driver` is a C type declared as `repr(C)`.
// - `struct pci_driver` embeds a `struct device_driver`.
// - `DEVICE_DRIVER_OFFSET` is the correct byte offset to the embedded `struct device_driver`.
unsafe impl<T: Driver + 'static> driver::DriverLayout for Adapter<T> {
type DriverType = bindings::pci_driver;
const DEVICE_DRIVER_OFFSET: usize = core::mem::offset_of!(Self::DriverType, driver);
}
// SAFETY: A call to `unregister` for a given instance of `DriverType` is guaranteed to be valid if

3
rust/kernel/platform.rs
View File

@@ -28,8 +28,11 @@ pub struct Adapter<T: Driver>(T);
// SAFETY:
// - `bindings::platform_driver` is a C type declared as `repr(C)`.
// - `struct platform_driver` embeds a `struct device_driver`.
// - `DEVICE_DRIVER_OFFSET` is the correct byte offset to the embedded `struct device_driver`.
unsafe impl<T: Driver + 'static> driver::DriverLayout for Adapter<T> {
type DriverType = bindings::platform_driver;
const DEVICE_DRIVER_OFFSET: usize = core::mem::offset_of!(Self::DriverType, driver);
}
// SAFETY: A call to `unregister` for a given instance of `DriverType` is guaranteed to be valid if

3
rust/kernel/usb.rs
View File

@@ -29,8 +29,11 @@ pub struct Adapter<T: Driver>(T);
// SAFETY:
// - `bindings::usb_driver` is a C type declared as `repr(C)`.
// - `struct usb_driver` embeds a `struct device_driver`.
// - `DEVICE_DRIVER_OFFSET` is the correct byte offset to the embedded `struct device_driver`.
unsafe impl<T: Driver + 'static> driver::DriverLayout for Adapter<T> {
type DriverType = bindings::usb_driver;
const DEVICE_DRIVER_OFFSET: usize = core::mem::offset_of!(Self::DriverType, driver);
}
// SAFETY: A call to `unregister` for a given instance of `DriverType` is guaranteed to be valid if