[PATCH 0/7] drm/nova: replace `transmute` with `zerocopy`

[David Tadokoro]

Oi Pedro,

Não olhei a fundo o seu patchset, mas pode já enviar para a revisão de
verdade!

Parabéns pelo trabalho e obrigado por estreiar o Rust no kernel dentro
disciplina :)

Abraços,
David

On Mon Jun 22, 2026 at 3:40 PM -03, Pedro Yudi Honda wrote:
> From: Pedro Yudi Honda <niyudi.honda em usp.br>
>
> This series follows the introduction of `zerocopy` to rust-next and
> replaces `transmute` traits with `zerocopy` traits. These changes are
> mechanical and don't alter functionality.
>
> Specifically, the trait `transmute::FromBytes` is replaced by
> `zerocopy::FromBytes` and the trait `transmute::AsBytes` is replaced
> by `zerocopy::IntoBytes`. Additional traits such as
> `zerocopy::Immutable` and `zerocopy::KnownLayout` are implemented as
> necessary.
>
> This does not replace the trait implemented in newtypes over
> bindings. Currently, the only solution I can think of is mirroring
> the bindings into another type and transmuting when necessary, but
> that does not seem practical. Another issue is a type like
> `gsp::cmdq::GspMem` that explicitly does not meet the requirements
> for `FromBytes`, but unsafely implements the trait anyway because it
> knows all of its uses. Unsafely implementing `zerocopy::FromBytes` is
> not allowed, and implementing `zerocopy::TryFromBytes` would add
> unnecessary overhead.
>
> Feedback from the maintainers on the direction in these cases would
> be appreciated.
>
> Pedro Yudi Honda (7):
>   drm/nova: use `zerocopy` in firmware.rs
>   drm/nova: use `zerocopy` in vbios.rs
>   drm/nova: use `zerocopy` in booter.rs
>   drm/nova: use `zerocopy` in fwsec.rs
>   drm/nova: use `zerocopy` in bootloader.rs
>   drm/nova: use `zerocopy` in riscv.rs
>   drm/nova: remove unused trait in commands.rs
>
>  drivers/gpu/nova-core/firmware.rs             | 16 ++-----
>  drivers/gpu/nova-core/firmware/booter.rs      | 26 +++-------
>  drivers/gpu/nova-core/firmware/fwsec.rs       | 47 +++++--------------
>  .../nova-core/firmware/fwsec/bootloader.rs    | 16 ++-----
>  drivers/gpu/nova-core/firmware/riscv.rs       | 10 ++--
>  drivers/gpu/nova-core/gsp/commands.rs         |  9 +---
>  drivers/gpu/nova-core/vbios.rs                | 34 ++++----------
>  7 files changed, 40 insertions(+), 118 deletions(-)

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