linux-kernel - Re: [PATCH v6 09/16] rust: pci: add basic PCI device / driver abstractions

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Message-ID: <2024121520-groove-outshine-f7f4@gregkh>
Date: Sun, 15 Dec 2024 13:23:22 +0100
From: Greg KH <gregkh@...uxfoundation.org>
To: Danilo Krummrich <dakr@...nel.org>
Cc: rafael@...nel.org, bhelgaas@...gle.com, ojeda@...nel.org,
	alex.gaynor@...il.com, boqun.feng@...il.com, gary@...yguo.net,
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	rcu@...r.kernel.org
Subject: Re: [PATCH v6 09/16] rust: pci: add basic PCI device / driver
 abstractions

On Thu, Dec 12, 2024 at 05:33:40PM +0100, Danilo Krummrich wrote:
> +impl DeviceId {
> +    const PCI_ANY_ID: u32 = !0;
> +
> +    /// PCI_DEVICE macro.
> +    pub const fn new(vendor: u32, device: u32) -> Self {
> +        Self(bindings::pci_device_id {
> +            vendor,
> +            device,
> +            subvendor: DeviceId::PCI_ANY_ID,
> +            subdevice: DeviceId::PCI_ANY_ID,
> +            class: 0,
> +            class_mask: 0,
> +            driver_data: 0,
> +            override_only: 0,
> +        })
> +    }
> +
> +    /// PCI_DEVICE_CLASS macro.
> +    pub const fn with_class(class: u32, class_mask: u32) -> Self {

I know naming is hard, and I'm not going to object to this at all, but
using "new()" and "with_class()" feels a bit odd and mis-matched.  How
about spelling it out, pci_device(), and pci_device_class()?

Anyway, not a bit deal at all, let's see how this plays out with real
drivers and we can always change it later.

> +// Allow drivers R/O access to the fields of `pci_device_id`; should we prefer accessor functions
> +// to void exposing C structure fields?

Minor nit, do you mean "to avoid exposing..."?

Other than these, this looks good!  If I can get an ack from the PCI
maintainer, I'll be glad to queue these up in my driver core tree...

thanks,

greg k-h