Re: [PATCH v2 00/19] gpu: nova-core: register!() macro improvements

[Lyude Paul <lyude@redhat.com>]

For the series:

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

On Fri, 2025-07-18 at 16:26 +0900, Alexandre Courbot wrote:
> This patch series introduces a number of improvements to nova-core's
> register!() macro in order to make it more useful to Nova itself, and to
> bring it closer to graduation into the wider kernel crate.
> 
> The first half is trivial fixes and code reorganization to let the
> following patches apply more cleanly.
> 
> The interesting stuff begins with the introduction of proper `Debug` and
> `Default` implementations leveraging the field information that is made
> available by the first half of the patchset. `Debug` now displays the
> interpreted values of all the fields on top of the hexadecimal
> representation of the register; and `Default` now initializes all the
> fields to their declared default value instead of just zeroes.
> 
> Then goes a complete redesign of the way relative registers work. The
> previous way was very unsafe as it accepted any literal value as the
> base. Now, valid bases can (and must) be explicitly defined for specific
> group of relative registers. All these bases are belong to us, and thus
> can be validated at build-time.
> 
> Next come arrays of registers, a useful feature to represent contiguous
> groups of registers that are interpreted identically. For these we have
> both build-time and runtime checked accessors. We immediately make use
> of them to clean up the FUSE registers code, which was a bit unsightly
> due to the lack of this feature.
> 
> Finally, combining the two features: arrays of relative registers, which
> we don't really need at the moment, but will become needed for GSP
> booting.
> 
> There are still features that need to be implemented before this macro
> can be considered ready for other drivers:
> 
> - Make I/O accessors optional,
> - Support other sizes than `u32`,
> - Allow visibility control for registers and individual fields,
> - Convert the range syntax to inclusive slices instead of NVIDIA's
>   OpenRM format,
> - ... and proper suitability assessment by other driver contributors.
> 
> These should be trivial compared to the work that is done in this
> series.
> 
> Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
> ---
> Changes in v2:
> - Improve documentation and add layout diagram for the relative
>   registers example.
> - Fix build error when fields named `offset` are declared.
> - Link to v1: https://lore.kernel.org/r/20250704-nova-regs-v1-0-f88d028781a4@nvidia.com
> 
> ---
> Alexandre Courbot (18):
>       gpu: nova-core: register: fix typo
>       gpu: nova-core: register: allow fields named `offset`
>       gpu: nova-core: register: improve documentation for basic registers
>       gpu: nova-core: register: simplify @leaf_accessor rule
>       gpu: nova-core: register: remove `try_` accessors for relative registers
>       gpu: nova-core: register: move OFFSET declaration to I/O impl block
>       gpu: nova-core: register: fix documentation and indentation
>       gpu: nova-core: register: add missing doccomments for fixed registers I/O accessors
>       gpu: nova-core: register: add fields dispatcher internal rule
>       gpu: nova-core: register: improve `Debug` implementation
>       gpu: nova-core: register: generate correct `Default` implementation
>       gpu: nova-core: register: split @io rule into fixed and relative versions
>       gpu: nova-core: register: use #[inline(always)] for all methods
>       gpu: nova-core: register: redesign relative registers
>       gpu: nova-core: falcon: add distinct base address for PFALCON2
>       gpu: nova-core: register: add support for register arrays
>       gpu: nova-core: falcon: use register arrays for FUSE registers
>       gpu: nova-core: register: add support for relative array registers
> 
> John Hubbard (1):
>       gpu: nova-core: register: minor grammar and spelling fixes
> 
>  Documentation/gpu/nova/core/todo.rst      |   2 -
>  drivers/gpu/nova-core/falcon.rs           |  72 +--
>  drivers/gpu/nova-core/falcon/gsp.rs       |  16 +-
>  drivers/gpu/nova-core/falcon/hal/ga102.rs |  47 +-
>  drivers/gpu/nova-core/falcon/sec2.rs      |  13 +-
>  drivers/gpu/nova-core/gpu.rs              |   2 +-
>  drivers/gpu/nova-core/regs.rs             |  83 ++--
>  drivers/gpu/nova-core/regs/macros.rs      | 789 +++++++++++++++++++++++++-----
>  8 files changed, 795 insertions(+), 229 deletions(-)
> ---
> base-commit: 14ae91a81ec8fa0bc23170d4aa16dd2a20d54105
> change-id: 20250703-nova-regs-24dddef5fba3
> 
> Best regards,

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

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