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

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Message-ID: <44b56a133d2bcbb7606d31839bac1ecfab509ae1.camel@redhat.com>
Date: Wed, 26 Nov 2025 18:43:22 -0500
From: Lyude Paul <lyude@...hat.com>
To: John Hubbard <jhubbard@...dia.com>, Danilo Krummrich <dakr@...nel.org>
Cc: Alexandre Courbot <acourbot@...dia.com>, Joel Fernandes	
 <joelagnelf@...dia.com>, Timur Tabi <ttabi@...dia.com>, Alistair Popple	
 <apopple@...dia.com>, Edwin Peer <epeer@...dia.com>, Zhi Wang
 <zhiw@...dia.com>,  David Airlie <airlied@...il.com>, Simona Vetter
 <simona@...ll.ch>, Bjorn Helgaas <bhelgaas@...gle.com>,  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 <lossin@...nel.org>, Andreas Hindborg <a.hindborg@...nel.org>, Alice
 Ryhl <aliceryhl@...gle.com>,  Trevor Gross <tmgross@...ch.edu>,
 nouveau@...ts.freedesktop.org, rust-for-linux@...r.kernel.org, LKML	
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/5] gpu: nova-core: add FbRange.len() and use it in
 boot.rs

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@...dia.com>
> Signed-off-by: John Hubbard <jhubbard@...dia.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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