linux-kernel - Re: [PATCH v3 4/5] rust: pci: add config space read/write support

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Message-Id: <DDWIPOOIN5X6.3EJE6QNXV61PX@kernel.org>
Date: Fri, 31 Oct 2025 13:48:41 +0100
From: "Danilo Krummrich" <dakr@...nel.org>
To: "Zhi Wang" <zhiw@...dia.com>
Cc: <rust-for-linux@...r.kernel.org>, <bhelgaas@...gle.com>,
 <kwilczynski@...nel.org>, <ojeda@...nel.org>, <alex.gaynor@...il.com>,
 <boqun.feng@...il.com>, <gary@...yguo.net>, <bjorn3_gh@...tonmail.com>,
 <lossin@...nel.org>, <a.hindborg@...nel.org>, <aliceryhl@...gle.com>,
 <tmgross@...ch.edu>, <linux-pci@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, <cjia@...dia.com>, <smitra@...dia.com>,
 <ankita@...dia.com>, <aniketa@...dia.com>, <kwankhede@...dia.com>,
 <targupta@...dia.com>, <zhiwang@...nel.org>, <acourbot@...dia.com>,
 <joelagnelf@...dia.com>, <jhubbard@...dia.com>, <markus.probst@...teo.de>
Subject: Re: [PATCH v3 4/5] rust: pci: add config space read/write support

On Thu Oct 30, 2025 at 4:48 PM CET, Zhi Wang wrote:
> +impl<'a, const SIZE: usize> Io<SIZE> for ConfigSpace<'a, SIZE> {
> +    /// Returns the base address of this mapping.
> +    #[inline]
> +    fn addr(&self) -> usize {
> +        0
> +    }
> +
> +    /// Returns the maximum size of this mapping.
> +    #[inline]
> +    fn maxsize(&self) -> usize {
> +        self.pdev.cfg_size().map_or(0, |v| v as usize)
> +    }
> +
> +    define_read!(fallible, try_read8, call_config_read, pci_read_config_byte -> u8);
> +    define_read!(fallible, try_read16, call_config_read, pci_read_config_word -> u16);
> +    define_read!(fallible, try_read32, call_config_read, pci_read_config_dword -> u32);
> +
> +    define_write!(fallible, try_write8, call_config_write, pci_write_config_byte <- u8);
> +    define_write!(fallible, try_write16, call_config_write, pci_write_config_word <- u16);
> +    define_write!(fallible, try_write32, call_config_write, pci_write_config_dword <- u32);
> +}

Please also implement the infallible ones.

> +
>  /// A PCI BAR to perform I/O-Operations on.
>  ///
>  /// # Invariants
> @@ -615,6 +670,11 @@ pub fn set_master(&self) {
>          // SAFETY: `self.as_raw` is guaranteed to be a pointer to a valid `struct pci_dev`.
>          unsafe { bindings::pci_set_master(self.as_raw()) };
>      }
> +
> +    /// Return an initialized config space object.
> +    pub fn config_space<'a>(&'a self) -> Result<ConfigSpace<'a>> {
> +        Ok(ConfigSpace { pdev: self })
> +    }

Please see [1].

[1] https://lore.kernel.org/lkml/DDWINZJUGVQ8.POKS7A6ZSRFK@kernel.org/