linux-kernel - [PATCH 1/4] rust: device: support `dev

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Message-ID: <20260120181152.3640314-1-gary@kernel.org>
Date: Tue, 20 Jan 2026 18:11:06 +0000
From: Gary Guo <gary@...nel.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.org>,
	Miguel Ojeda <ojeda@...nel.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>
Cc: rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: [PATCH 1/4] rust: device: support `dev_printk` on all devices

From: Gary Guo <gary@...yguo.net>

Currently, `dev_*` only works on the core `Device`, but not on any other
bus or class device objects. This causes a pattern of
`dev_info!(pdev.as_ref())` which is not ideal.

This adds support of using these devices directly with `dev_*` macros, by
adding `AsRef` call inside the macro. To make sure we can still use just
`kernel::device::Device`, as `AsRef` implementation is added for it; this
is typical for types that is designed to use with `AsRef` anyway, for
example, `str` implements `AsRef<str>` and `Path` implements `AsRef<Path>`.

Signed-off-by: Gary Guo <gary@...yguo.net>
---
 rust/kernel/device.rs | 9 ++++++++-
 rust/kernel/pci.rs    | 2 +-
 rust/kernel/pci/id.rs | 2 +-
 3 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/rust/kernel/device.rs b/rust/kernel/device.rs
index c7b5db9dcca1..94e0548e7687 100644
--- a/rust/kernel/device.rs
+++ b/rust/kernel/device.rs
@@ -601,6 +601,13 @@ impl DeviceContext for Core {}
 impl DeviceContext for CoreInternal {}
 impl DeviceContext for Normal {}
 
+impl<Ctx: DeviceContext> AsRef<Device<Ctx>> for Device<Ctx> {
+    #[inline]
+    fn as_ref(&self) -> &Device<Ctx> {
+        self
+    }
+}
+
 /// Convert device references to bus device references.
 ///
 /// Bus devices can implement this trait to allow abstractions to provide the bus device in
@@ -720,7 +727,7 @@ macro_rules! impl_device_context_into_aref {
 macro_rules! dev_printk {
     ($method:ident, $dev:expr, $($f:tt)*) => {
         {
-            ($dev).$method($crate::prelude::fmt!($($f)*));
+            $crate::device::Device::$method($dev.as_ref(), $crate::prelude::fmt!($($f)*))
         }
     }
 }
diff --git a/rust/kernel/pci.rs b/rust/kernel/pci.rs
index bea76ca9c3da..3946ca919332 100644
--- a/rust/kernel/pci.rs
+++ b/rust/kernel/pci.rs
@@ -351,7 +351,7 @@ impl Device {
     ///     // Get an instance of `Vendor`.
     ///     let vendor = pdev.vendor_id();
     ///     dev_info!(
-    ///         pdev.as_ref(),
+    ///         pdev,
     ///         "Device: Vendor={}, Device=0x{:x}\n",
     ///         vendor,
     ///         pdev.device_id()
diff --git a/rust/kernel/pci/id.rs b/rust/kernel/pci/id.rs
index c09125946d9e..e2d9e8804347 100644
--- a/rust/kernel/pci/id.rs
+++ b/rust/kernel/pci/id.rs
@@ -22,7 +22,7 @@
 /// fn probe_device(pdev: &pci::Device<Core>) -> Result {
 ///     let pci_class = pdev.pci_class();
 ///     dev_info!(
-///         pdev.as_ref(),
+///         pdev,
 ///         "Detected PCI class: {}\n",
 ///         pci_class
 ///     );

base-commit: 053966c344dbd346e71305f530e91ea77916189f
-- 
2.51.2