linux-kernel - Re: [PATCH v4 07/20] gpu: nova-core: expose the offset of each register as a type constant

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Message-ID: <2cae27e76d2e1004a62328e6a822ecb536d8450c.camel@redhat.com>
Date: Fri, 30 May 2025 17:40:54 -0400
From: Lyude Paul <lyude@...hat.com>
To: Alexandre Courbot <acourbot@...dia.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 <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...nel.org>,
 Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, 
 Danilo Krummrich	 <dakr@...nel.org>, David Airlie <airlied@...il.com>,
 Simona Vetter	 <simona@...ll.ch>, Maarten Lankhorst
 <maarten.lankhorst@...ux.intel.com>,  Maxime Ripard <mripard@...nel.org>,
 Thomas Zimmermann <tzimmermann@...e.de>
Cc: John Hubbard <jhubbard@...dia.com>, Ben Skeggs <bskeggs@...dia.com>, 
 Joel Fernandes <joelagnelf@...dia.com>, Timur Tabi <ttabi@...dia.com>,
 Alistair Popple <apopple@...dia.com>, 	linux-kernel@...r.kernel.org,
 rust-for-linux@...r.kernel.org, 	nouveau@...ts.freedesktop.org,
 dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v4 07/20] gpu: nova-core: expose the offset of each
 register as a type constant

Reviewed-by: Lyude Paul <lyude@...hat.com>

On Wed, 2025-05-21 at 15:45 +0900, Alexandre Courbot wrote:
> Although we want to access registers using the provided methods, it is
> sometimes needed to use their raw offset, for instance when working with
> a register array.
> 
> Expose the offset of each register using a type constant to avoid
> resorting to hardcoded values.
> 
> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
> ---
>  drivers/gpu/nova-core/regs/macros.rs | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/nova-core/regs/macros.rs b/drivers/gpu/nova-core/regs/macros.rs
> index d7f09026390b4ccb1c969f2b29caf07fa9204a77..7cd013f3c90bbd8ca437d4072cae8f11d7946fcd 100644
> --- a/drivers/gpu/nova-core/regs/macros.rs
> +++ b/drivers/gpu/nova-core/regs/macros.rs
> @@ -78,7 +78,7 @@ macro_rules! register {
>              $($fields:tt)*
>          }
>      ) => {
> -        register!(@common $name $(, $comment)?);
> +        register!(@common $name @ $offset $(, $comment)?);
>          register!(@field_accessors $name { $($fields)* });
>          register!(@io $name @ $offset);
>      };
> @@ -89,7 +89,7 @@ macro_rules! register {
>              $($fields:tt)*
>          }
>      ) => {
> -        register!(@common $name $(, $comment)?);
> +        register!(@common $name @ $offset $(, $comment)?);
>          register!(@field_accessors $name { $($fields)* });
>          register!(@io$name @ + $offset);
>      };
> @@ -98,7 +98,7 @@ macro_rules! register {
>  
>      // Defines the wrapper `$name` type, as well as its relevant implementations (`Debug`, `BitOr`,
>      // and conversion to regular `u32`).
> -    (@common $name:ident $(, $comment:literal)?) => {
> +    (@common $name:ident @ $offset:literal $(, $comment:literal)?) => {
>          $(
>          #[doc=$comment]
>          )?
> @@ -106,6 +106,11 @@ macro_rules! register {
>          #[derive(Clone, Copy, Default)]
>          pub(crate) struct $name(u32);
>  
> +        #[allow(dead_code)]
> +        impl $name {
> +            pub(crate) const OFFSET: usize = $offset;
> +        }
> +
>          // TODO: display the raw hex value, then the value of all the fields. This requires
>          // matching the fields, which will complexify the syntax considerably...
>          impl ::core::fmt::Debug for $name {
> 

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

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