linux-kernel - Re: [PATCH v6 1/4] gpu: nova-core: implement Display for Spec

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Message-ID: <673640f6b26617bc5e1f4962bc2f9f7257346efb.camel@nvidia.com>
Date: Sat, 8 Nov 2025 05:02:08 +0000
From: Timur Tabi <ttabi@...dia.com>
To: "dakr@...nel.org" <dakr@...nel.org>, John Hubbard <jhubbard@...dia.com>
CC: Alexandre Courbot <acourbot@...dia.com>, "lossin@...nel.org"
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Subject: Re: [PATCH v6 1/4] gpu: nova-core: implement Display for Spec

On Fri, 2025-11-07 at 20:39 -0800, John Hubbard wrote:
> Implement Display for Spec. This simplifies the dev_info!() code for
> printing banners such as:
> 
>     NVIDIA (Chipset: GA104, Architecture: Ampere, Revision: a.1)
> 
> Cc: Alexandre Courbot <acourbot@...dia.com>
> Cc: Danilo Krummrich <dakr@...nel.org>
> Cc: Timur Tabi <ttabi@...dia.com>
> Signed-off-by: John Hubbard <jhubbard@...dia.com>

I'm okay with the entire patch set, but I do have a few questions.

> +impl fmt::Display for Spec {
> +    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
> +        write!(
> +            f,
> +            "Chipset: {}, Architecture: {:?}, Revision: {}",
> +            self.chipset,
> +            self.chipset.arch(),
> +            self.revision
> +        )
> +    }
> +}
> +
>  /// Structure holding the resources required to operate the GPU.
>  #[pin_data]
>  pub(crate) struct Gpu {
> @@ -206,13 +218,7 @@ pub(crate) fn new<'a>(
>      ) -> impl PinInit<Self, Error> + 'a {
>          try_pin_init!(Self {
>              spec: Spec::new(bar).inspect(|spec| {
> -                dev_info!(
> -                    pdev.as_ref(),
> -                    "NVIDIA (Chipset: {}, Architecture: {:?}, Revision: {})\n",
> -                    spec.chipset,
> -                    spec.chipset.arch(),
> -                    spec.revision
> -                );
> +                dev_info!(pdev.as_ref(),"NVIDIA ({})\n", spec);

I believe that this is the only place where a `Spec` is actually printed.  Does it really make
sense to implement Display for a single usage?  Do we generally want to implement Display for
new types?