linux-kernel - Re: [PATCH v8 2/3] rust: io: mem: add a generic iomem abstraction

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Message-ID: <aCYP2j6R7NkcC2ya@pollux>
Date: Thu, 15 May 2025 18:01:30 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: Daniel Almeida <daniel.almeida@...labora.com>
Cc: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>,
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <benno.lossin@...ton.me>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Ying Huang <huang.ying.caritas@...il.com>,
	linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org
Subject: Re: [PATCH v8 2/3] rust: io: mem: add a generic iomem abstraction

On Fri, May 09, 2025 at 05:29:47PM -0300, Daniel Almeida wrote:
> +impl<const SIZE: usize> ExclusiveIoMem<SIZE> {
> +    /// Creates a new `ExclusiveIoMem` instance.
> +    pub(crate) fn ioremap(resource: &Resource) -> Result<Self> {
> +        let iomem = IoMem::ioremap(resource)?;
> +
> +        let start = resource.start();
> +        let size = resource.size();
> +        let name = resource.name();
> +
> +        let region = resource
> +            .request_region(start, size, name, io::resource::flags::IORESOURCE_MEM)
> +            .ok_or(EBUSY)?;
> +
> +        let iomem = ExclusiveIoMem {
> +            iomem,
> +            _region: region,
> +        };
> +
> +        Ok(iomem)
> +    }
> +
> +    pub(crate) fn new(resource: &Resource, device: &Device) -> Result<Devres<Self>> {
> +        let iomem = Self::ioremap(resource)?;
> +        let devres = Devres::new(device, iomem, GFP_KERNEL)?;

Here and in IoMem, Devres::new() requires a &Device<Bound>.