Re: [PATCH 0/1] nova-core: Convert bindings to use zerocopy

[Alistair Popple <apopple@nvidia.com>]

On 2026-06-29 at 17:09 +1000, Alexandre Courbot <acourbot@nvidia.com> wrote...
> On Mon Jun 29, 2026 at 2:55 PM JST, SeungJong Ha wrote:
> > On Mon Jun 29, 2026 at 2:52 AM UTC, Alistair Popple wrote:
> >> Given the inevitable conflicts that will arise from trying to merge several
> >> different series doing bits of the same thing I'm happy if someone wants to take
> >> this patch and the others and roll them into a single series. Alternatively I am
> >> happy to take that on - hopefully Alex can provide some guidance here for what
> >> would be preferred.
> >
> > Agreed it should be one series. Happy to help or fold in my part --
> > whatever Alex prefers.
> 
> Since there is no particular urgency to switch from transmute to
> zerocopy, I think it makes sense to merge things in an order that limits
> churn as much as possible.
> 
> This means the conversion should probably be done bottom-to-top,
> starting with the bindings, then the types that embed them. For the
> bindings, `#[derive(zerocopy_derive::most_traits)]` should be landing
> soon [1] and I would like us to understand first whether that is
> something we want to use with the bindings; if so, let's wait for it to
> be available (unless there is a good reason to convert quickly) as each
> change to `bindings.rs` is almost 200 LoCs.

I think it makes sense to wait, if only to avoid churn on the generated
bindings.

> Since Alistair maintains the tool generating the bindings [2], I think
> it would make sense if he takes care of that part (bindings and anything
> embedding them) as well.

Agreed.

> There are also types in nova-core that do not depend on bindings at all;
> for these I think it is fine to take the patches that have been already
> submitted if they apply cleanly and build, as these are good
> opportunities for first contributions. Nicolás was first to send
> something for vbios/firmware [3] so I'd like to consider his v2 first
> now that `-rc1` is tagged.

Yep - given the interest from other contributors I'm going to leave all the
non-binding related conversions alone. In other words anything that does not
require changes to drivers/gpu/nova-core/gsp/fw/r570_144/bindings.rs would be
good for others to look at, and thanks for the contributions!

 - Alistair

> For the rest, I'm happy to merge anything that applies - small patches
> limited to a single module should be easier to process and less likely
> to conflict.
> 
> [1] https://lore.kernel.org/all/20260625231919.692444-1-ojeda@kernel.org/
> [2] https://github.com/apopple-nvidia/nova-gsp-binding-generator/
> [3] https://lore.kernel.org/all/20260621143647.264770-1-nico.antinori.7@gmail.com/