Re: [PATCH v2 2/5] gpu: nova-core: add FbRange.len() and use it in boot.rs

[Lyude Paul <lyude@redhat.com>]

I'm not sure this is necessary - for one, we could just use the .len() method
on the Range. As well - if we just implement Deref for FbRange (which I think
would be fine here) we could just use .len() through that.

On Tue, 2025-11-25 at 17:39 -0800, John Hubbard wrote:
> A tiny simplification: now that FbLayout uses its own specific FbRange
> type, add an FbRange.len() method, and use that to (very slightly)
> simplify the calculation of Frts::frts_size initialization.
> 
> Suggested-by: Alexandre Courbot <acourbot@nvidia.com>
> Signed-off-by: John Hubbard <jhubbard@nvidia.com>
> ---
>  drivers/gpu/nova-core/fb.rs       | 6 ++++++
>  drivers/gpu/nova-core/gsp/boot.rs | 2 +-
>  2 files changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/nova-core/fb.rs b/drivers/gpu/nova-core/fb.rs
> index 333e952400e6..9fcd915e12e1 100644
> --- a/drivers/gpu/nova-core/fb.rs
> +++ b/drivers/gpu/nova-core/fb.rs
> @@ -100,6 +100,12 @@ pub(crate) fn unregister(&self, bar: &Bar0) {
>  
>  pub(crate) struct FbRange(Range<u64>);
>  
> +impl FbRange {
> +    pub(crate) fn len(&self) -> u64 {
> +        self.0.end - self.0.start
> +    }
> +}
> +
>  impl From<Range<u64>> for FbRange {
>      fn from(range: Range<u64>) -> Self {
>          Self(range)
> diff --git a/drivers/gpu/nova-core/gsp/boot.rs b/drivers/gpu/nova-core/gsp/boot.rs
> index 54937606b5b0..846064221931 100644
> --- a/drivers/gpu/nova-core/gsp/boot.rs
> +++ b/drivers/gpu/nova-core/gsp/boot.rs
> @@ -70,7 +70,7 @@ fn run_fwsec_frts(
>              bios,
>              FwsecCommand::Frts {
>                  frts_addr: fb_layout.frts.start,
> -                frts_size: fb_layout.frts.end - fb_layout.frts.start,
> +                frts_size: fb_layout.frts.len(),
>              },
>          )?;
>  

-- 
Cheers,
 Lyude Paul (she/her)
 Senior Software Engineer at Red Hat

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