linux-kernel - Re: [PATCH 3/6] gpu: nova-core: Blackwell: basic GPU identification

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Message-ID: <CAPM=9tw=n08NhAdFNHV7k=1CKz=nHPxu2bcXuNX8ObjAg1u+Kg@mail.gmail.com>
Date: Wed, 19 Nov 2025 17:15:16 +1000
From: Dave Airlie <airlied@...il.com>
To: John Hubbard <jhubbard@...dia.com>
Cc: Alexandre Courbot <acourbot@...dia.com>, Timur Tabi <ttabi@...dia.com>, 
	"dakr@...nel.org" <dakr@...nel.org>, "lossin@...nel.org" <lossin@...nel.org>, 
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	"aliceryhl@...gle.com" <aliceryhl@...gle.com>, Zhi Wang <zhiw@...dia.com>, 
	"simona@...ll.ch" <simona@...ll.ch>, "alex.gaynor@...il.com" <alex.gaynor@...il.com>, 
	"ojeda@...nel.org" <ojeda@...nel.org>, "tmgross@...ch.edu" <tmgross@...ch.edu>, 
	"nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>, 
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	"rust-for-linux@...r.kernel.org" <rust-for-linux@...r.kernel.org>, 
	"bjorn3_gh@...tonmail.com" <bjorn3_gh@...tonmail.com>, Edwin Peer <epeer@...dia.com>, 
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	"gary@...yguo.net" <gary@...yguo.net>, Alistair Popple <apopple@...dia.com>, 
	Nouveau <nouveau-bounces@...ts.freedesktop.org>
Subject: Re: [PATCH 3/6] gpu: nova-core: Blackwell: basic GPU identification

On Wed, 19 Nov 2025 at 17:08, John Hubbard <jhubbard@...dia.com> wrote:
>
> On 11/18/25 7:15 PM, Dave Airlie wrote:
> > On Wed, 19 Nov 2025 at 12:46, Alexandre Courbot <acourbot@...dia.com> wrote:
> ...
> >>> Maybe let's just do the long lists of chipsets for now...?
> >>
> >> Yeah, I've hit this issue as well. The compiler might remove that
> >> limitation in the future, or maybe we can craft a `chipset_range!()`
> >> macro that hides the messy casting, but this exhaustive listing also has
> >> the benefit of forcing us to consider every critical site whenever we
> >> support a new chipset so I'm actually not too bothered by it.
> >
> > I wrote some macros in my nova-core-experiments, had
> > chipset_before/after/range I think
> >
>
> aha, I was afraid someone was going to say "macros" out loud, at some
> point. And now you've gone and done it. :)
>
> Well, I think we probably want:
>
> a) The ability to clearly specify a chipset range, and
>
> b) For extra credit, maybe: also be able to specify entire GPU
> architectures, and architecture ranges.
>
> ...again, without too much extraneous noise at the call sites: the goal is
> to read it easily:
>
>      GA102..=GA104 | Architecture::Blackwell
>
>
> for example. Macros are going to require that to be less clean, but
> let me poke around and see.

https://gitlab.freedesktop.org/nouvelles/kernel/-/blob/nova-core-experiments-fsp-boot/drivers/gpu/nova-core/gpu.rs?ref_type=heads#L96

is what I did, but yeah probably not going to get nice ranges like that.

Dave.