linux-kernel - Re: [PATCH v3 15/16] rust: platform: add basic platform device / driver abstractions

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Message-ID: <CAH5fLghVDqWiWfi2WKsNi3n=2pR_Hy3ZLwY8q2xfjAvpHuDx=w@mail.gmail.com>
Date: Wed, 30 Oct 2024 16:50:43 +0100
From: Alice Ryhl <aliceryhl@...gle.com>
To: Danilo Krummrich <dakr@...nel.org>
Cc: gregkh@...uxfoundation.org, rafael@...nel.org, bhelgaas@...gle.com, 
	ojeda@...nel.org, alex.gaynor@...il.com, boqun.feng@...il.com, 
	gary@...yguo.net, bjorn3_gh@...tonmail.com, benno.lossin@...ton.me, 
	tmgross@...ch.edu, a.hindborg@...sung.com, airlied@...il.com, 
	fujita.tomonori@...il.com, lina@...hilina.net, pstanner@...hat.com, 
	ajanulgu@...hat.com, lyude@...hat.com, robh@...nel.org, 
	daniel.almeida@...labora.com, saravanak@...gle.com, 
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-pci@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 15/16] rust: platform: add basic platform device /
 driver abstractions

On Tue, Oct 22, 2024 at 11:33 PM Danilo Krummrich <dakr@...nel.org> wrote:
> +/// Drivers must implement this trait in order to get a platform driver registered. Please refer to
> +/// the `Adapter` documentation for an example.
> +pub trait Driver {
> +    /// The type holding information about each device id supported by the driver.
> +    ///
> +    /// TODO: Use associated_type_defaults once stabilized:
> +    ///
> +    /// type IdInfo: 'static = ();
> +    type IdInfo: 'static;
> +
> +    /// The table of device ids supported by the driver.
> +    const ID_TABLE: IdTable<Self::IdInfo>;
> +
> +    /// Platform driver probe.
> +    ///
> +    /// Called when a new platform device is added or discovered.
> +    /// Implementers should attempt to initialize the device here.
> +    fn probe(dev: &mut Device, id_info: Option<&Self::IdInfo>) -> Result<Pin<KBox<Self>>>;

This forces the user to put their driver data in a KBox, but they
might want to use an Arc instead. You don't actually *need* a KBox -
any ForeignOwnable seems to fit your purposes.

Please see my miscdevice and shrinker patchsets for examples of how
you can extend this to allow any ForeignOwnable.

Alice