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samples: rust: auxiliary: illustrate driver interaction

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Illustrate how a parent driver of an auxiliary driver can take advantage
of the device context guarantees given by the auxiliary bus and
subsequently safely derive its device private data.

Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
This commit is contained in:
Danilo Krummrich
2025-10-21 00:34:30 +02:00
parent 710ac54688
commit b0b7301b00
1 changed files with 19 additions and 3 deletions
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22
samples/rust/rust_driver_auxiliary.rs
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@@ -5,10 +5,17 @@
//! To make this driver probe, QEMU must be run with `-device pci-testdev`.
use kernel::{
auxiliary, c_str, device::Core, devres::Devres, driver, error::Error, pci, prelude::*,
auxiliary, c_str,
device::{Bound, Core},
devres::Devres,
driver,
error::Error,
pci,
prelude::*,
InPlaceModule,
};
use core::any::TypeId;
use pin_init::PinInit;
const MODULE_NAME: &CStr = <LocalModule as kernel::ModuleMetadata>::NAME;
@@ -43,6 +50,7 @@ impl auxiliary::Driver for AuxiliaryDriver {
#[pin_data]
struct ParentDriver {
private: TypeId,
#[pin]
_reg0: Devres<auxiliary::Registration>,
#[pin]
@@ -63,6 +71,7 @@ impl pci::Driver for ParentDriver {
fn probe(pdev: &pci::Device<Core>, _info: &Self::IdInfo) -> impl PinInit<Self, Error> {
try_pin_init!(Self {
private: TypeId::of::<Self>(),
_reg0 <- auxiliary::Registration::new(pdev.as_ref(), AUXILIARY_NAME, 0, MODULE_NAME),
_reg1 <- auxiliary::Registration::new(pdev.as_ref(), AUXILIARY_NAME, 1, MODULE_NAME),
})
@@ -70,9 +79,10 @@ impl pci::Driver for ParentDriver {
}
impl ParentDriver {
fn connect(adev: &auxiliary::Device) -> Result {
fn connect(adev: &auxiliary::Device<Bound>) -> Result {
let dev = adev.parent();
let pdev: &pci::Device = dev.try_into()?;
let pdev: &pci::Device<Bound> = dev.try_into()?;
let drvdata = dev.drvdata::<Self>()?;
dev_info!(
dev,
@@ -82,6 +92,12 @@ impl ParentDriver {
pdev.device_id()
);
dev_info!(
dev,
"We have access to the private data of {:?}.\n",
drvdata.private
);
Ok(())
}
}