linux-kernel - Re: [PATCH v4 6/7] sample: rust: pci: use `register!` macro

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Message-Id: <DG2DEH4ELYHK.2KUOIDQAILZHT@kernel.org>
Date: Sat, 31 Jan 2026 02:06:53 +0100
From: "Danilo Krummrich" <dakr@...nel.org>
To: "Alexandre Courbot" <acourbot@...dia.com>
Cc: "Alice Ryhl" <aliceryhl@...gle.com>, "Daniel Almeida"
 <daniel.almeida@...labora.com>, "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>, "Trevor
 Gross" <tmgross@...ch.edu>, "Yury Norov" <yury.norov@...il.com>, "John
 Hubbard" <jhubbard@...dia.com>, "Alistair Popple" <apopple@...dia.com>,
 "Joel Fernandes" <joelagnelf@...dia.com>, "Timur Tabi" <ttabi@...dia.com>,
 "Edwin Peer" <epeer@...dia.com>, "Eliot Courtney" <ecourtney@...dia.com>,
 "Dirk Behme" <dirk.behme@...bosch.com>, "Steven Price"
 <steven.price@....com>, <rust-for-linux@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 6/7] sample: rust: pci: use `register!` macro

On Wed Jan 28, 2026 at 3:37 AM CET, Alexandre Courbot wrote:
> Convert the direct IO accesses to properly defined registers.
>
> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
> ---
>  samples/rust/rust_driver_pci.rs | 23 ++++++++++++++++++-----
>  1 file changed, 18 insertions(+), 5 deletions(-)
>
> diff --git a/samples/rust/rust_driver_pci.rs b/samples/rust/rust_driver_pci.rs
> index 4dfb8a6a4707..df2232d6b71f 100644
> --- a/samples/rust/rust_driver_pci.rs
> +++ b/samples/rust/rust_driver_pci.rs
> @@ -70,24 +70,37 @@ fn testdev(index: &TestIndex, bar: &Bar0) -> Result<u32> {
>      fn config_space(pdev: &pci::Device<Bound>) {
>          let config = pdev.config_space();
>  
> -        // TODO: use the register!() macro for defining PCI configuration space registers once it
> -        // has been move out of nova-core.
> +        // Some PCI configuration space registers.
> +        ::kernel::register! {
> +            VENDOR_ID(u16) @ 0x0 {
> +                15:0 vendor_id;
> +            }
> +
> +            REVISION_ID(u8) @ 0x8 {
> +                7:0 revision_id;
> +            }
> +
> +            BAR(u32)[6] @ 0x10 {
> +                31:0 value;
> +            }
> +        }
> +
>          dev_info!(
>              pdev.as_ref(),
>              "pci-testdev config space read8 rev ID: {:x}\n",
> -            config.read8(0x8)
> +            REVISION_ID::read(&&config).revision_id()
>          );
>  
>          dev_info!(
>              pdev.as_ref(),
>              "pci-testdev config space read16 vendor ID: {:x}\n",
> -            config.read16(0)
> +            VENDOR_ID::read(&&config).vendor_id()
>          );
>  
>          dev_info!(
>              pdev.as_ref(),
>              "pci-testdev config space read32 BAR 0: {:x}\n",
> -            config.read32(0x10)
> +            BAR::read(&&config, 0).value()
>          );
>      }
>  }

That's only the config space registers, can you please also convert the MMIO
ones?