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Message-ID: <aLtjILVe4JaDoh1A@archiso>
Date: Fri, 5 Sep 2025 22:24:32 +0000
From: Elle Rhumsaa <elle@...thered-steel.dev>
To: Joel Fernandes <joelagnelf@...dia.com>
Cc: linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
dakr@...nel.org, acourbot@...dia.com,
Alistair Popple <apopple@...dia.com>,
Miguel Ojeda <ojeda@...nel.org>,
Alex Gaynor <alex.gaynor@...il.com>,
Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
bjorn3_gh@...tonmail.com, Benno Lossin <lossin@...nel.org>,
Andreas Hindborg <a.hindborg@...nel.org>,
Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
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>,
John Hubbard <jhubbard@...dia.com>, Timur Tabi <ttabi@...dia.com>,
joel@...lfernandes.org,
Daniel Almeida <daniel.almeida@...labora.com>,
nouveau@...ts.freedesktop.org, rust-for-linux@...r.kernel.org
Subject: Re: [PATCH v2 4/4] rust: Move register and bitstruct macros out of
Nova
On Wed, Sep 03, 2025 at 05:54:28PM -0400, Joel Fernandes wrote:
> Out of broad need for these macros in Rust, move them out. Several folks
> have shown interest (Nova, Tyr GPU drivers).
>
> bitstruct - defines bitfields in Rust structs similar to C.
> register - support for defining hardware registers and accessors.
>
> Signed-off-by: Joel Fernandes <joelagnelf@...dia.com>
> ---
> drivers/gpu/nova-core/falcon.rs | 2 +-
> drivers/gpu/nova-core/falcon/gsp.rs | 3 +-
> drivers/gpu/nova-core/falcon/sec2.rs | 2 +-
> drivers/gpu/nova-core/nova_core.rs | 3 -
> drivers/gpu/nova-core/regs.rs | 5 +-
> .../nova-core => rust/kernel}/bitstruct.rs | 31 ++++---
> rust/kernel/lib.rs | 2 +
> rust/kernel/prelude.rs | 2 +
> .../regs/macros.rs => rust/kernel/register.rs | 92 ++++++++++---------
> 9 files changed, 74 insertions(+), 68 deletions(-)
> rename {drivers/gpu/nova-core => rust/kernel}/bitstruct.rs (92%)
> rename drivers/gpu/nova-core/regs/macros.rs => rust/kernel/register.rs (90%)
>
> diff --git a/drivers/gpu/nova-core/falcon.rs b/drivers/gpu/nova-core/falcon.rs
> index be91aac6976a..06da6ce24482 100644
> --- a/drivers/gpu/nova-core/falcon.rs
> +++ b/drivers/gpu/nova-core/falcon.rs
> @@ -7,6 +7,7 @@
> use kernel::bindings;
> use kernel::device;
> use kernel::prelude::*;
> +use kernel::register::RegisterBase;
> use kernel::sync::aref::ARef;
> use kernel::time::Delta;
>
> @@ -14,7 +15,6 @@
> use crate::driver::Bar0;
> use crate::gpu::Chipset;
> use crate::regs;
> -use crate::regs::macros::RegisterBase;
> use crate::util;
>
> pub(crate) mod gsp;
> diff --git a/drivers/gpu/nova-core/falcon/gsp.rs b/drivers/gpu/nova-core/falcon/gsp.rs
> index f17599cb49fa..9287ab148da8 100644
> --- a/drivers/gpu/nova-core/falcon/gsp.rs
> +++ b/drivers/gpu/nova-core/falcon/gsp.rs
> @@ -3,8 +3,9 @@
> use crate::{
> driver::Bar0,
> falcon::{Falcon, FalconEngine, PFalcon2Base, PFalconBase},
> - regs::{self, macros::RegisterBase},
> + regs,
> };
> +use kernel::register::RegisterBase;
>
> /// Type specifying the `Gsp` falcon engine. Cannot be instantiated.
> pub(crate) struct Gsp(());
> diff --git a/drivers/gpu/nova-core/falcon/sec2.rs b/drivers/gpu/nova-core/falcon/sec2.rs
> index 815786c8480d..8f7b63b6c2b2 100644
> --- a/drivers/gpu/nova-core/falcon/sec2.rs
> +++ b/drivers/gpu/nova-core/falcon/sec2.rs
> @@ -1,7 +1,7 @@
> // SPDX-License-Identifier: GPL-2.0
>
> use crate::falcon::{FalconEngine, PFalcon2Base, PFalconBase};
> -use crate::regs::macros::RegisterBase;
> +use kernel::register::RegisterBase;
>
> /// Type specifying the `Sec2` falcon engine. Cannot be instantiated.
> pub(crate) struct Sec2(());
> diff --git a/drivers/gpu/nova-core/nova_core.rs b/drivers/gpu/nova-core/nova_core.rs
> index b218a2d42573..cb2bbb30cba1 100644
> --- a/drivers/gpu/nova-core/nova_core.rs
> +++ b/drivers/gpu/nova-core/nova_core.rs
> @@ -2,9 +2,6 @@
>
> //! Nova Core GPU Driver
>
> -#[macro_use]
> -mod bitstruct;
> -
> mod dma;
> mod driver;
> mod falcon;
> diff --git a/drivers/gpu/nova-core/regs.rs b/drivers/gpu/nova-core/regs.rs
> index 206dab2e1335..6d2f20623259 100644
> --- a/drivers/gpu/nova-core/regs.rs
> +++ b/drivers/gpu/nova-core/regs.rs
> @@ -4,9 +4,6 @@
> // but are mapped to types.
> #![allow(non_camel_case_types)]
>
> -#[macro_use]
> -pub(crate) mod macros;
> -
> use crate::falcon::{
> DmaTrfCmdSize, FalconCoreRev, FalconCoreRevSubversion, FalconFbifMemType, FalconFbifTarget,
> FalconModSelAlgo, FalconSecurityModel, PFalcon2Base, PFalconBase, PeregrineCoreSelect,
> @@ -331,6 +328,7 @@ pub(crate) fn mem_scrubbing_done(self) -> bool {
>
> pub(crate) mod gm107 {
> // FUSE
> + use kernel::prelude::*;
>
> register!(NV_FUSE_STATUS_OPT_DISPLAY @ 0x00021c04 {
> 0:0 display_disabled as bool;
> @@ -339,6 +337,7 @@ pub(crate) mod gm107 {
>
> pub(crate) mod ga100 {
> // FUSE
> + use kernel::prelude::*;
>
> register!(NV_FUSE_STATUS_OPT_DISPLAY @ 0x00820c04 {
> 0:0 display_disabled as bool;
> diff --git a/drivers/gpu/nova-core/bitstruct.rs b/rust/kernel/bitstruct.rs
> similarity index 92%
> rename from drivers/gpu/nova-core/bitstruct.rs
> rename to rust/kernel/bitstruct.rs
> index 1047c5c17e2d..06e5435df383 100644
> --- a/drivers/gpu/nova-core/bitstruct.rs
> +++ b/rust/kernel/bitstruct.rs
> @@ -1,9 +1,9 @@
> // SPDX-License-Identifier: GPL-2.0
> -//
> -// bitstruct.rs — Bitfield library for Rust structures
> -//
> -// A library that provides support for defining bit fields in Rust
> -// structures. Also used from things that need bitfields like register macro.
> +
> +//! Bitfield library for Rust structures
> +//!
> +//! A library that provides support for defining bit fields in Rust
> +//! structures. Also used from things that need bitfields like register macro.
> ///
> /// # Syntax
> ///
> @@ -32,6 +32,7 @@
> /// the result.
> /// - `as <type> ?=> <try_into_type>` calls `<try_into_type>`'s `TryFrom::<<type>>` implementation
> /// and returns the result. This is useful with fields for which not all values are valid.
> +#[macro_export]
> macro_rules! bitstruct {
> // Main entry point - defines the bitfield struct with fields
> ($vis:vis struct $name:ident : $storage:ty $(, $comment:literal)? { $($fields:tt)* }) => {
> @@ -125,7 +126,7 @@ impl $name {
> (@check_field_bounds $hi:tt:$lo:tt $field:ident as bool) => {
> #[allow(clippy::eq_op)]
> const _: () = {
> - ::kernel::build_assert!(
> + build_assert!(
> $hi == $lo,
> concat!("boolean field `", stringify!($field), "` covers more than one bit")
> );
> @@ -136,7 +137,7 @@ impl $name {
> (@check_field_bounds $hi:tt:$lo:tt $field:ident as $type:tt) => {
> #[allow(clippy::eq_op)]
> const _: () = {
> - ::kernel::build_assert!(
> + build_assert!(
> $hi >= $lo,
> concat!("field `", stringify!($field), "`'s MSB is smaller than its LSB")
> );
> @@ -198,15 +199,15 @@ impl $name {
> @leaf_accessor $name:ident $vis:vis $storage:ty, $hi:tt:$lo:tt $field:ident
> { $process:expr } $to_type:ty => $res_type:ty $(, $comment:literal)?;
> ) => {
> - ::kernel::macros::paste!(
> + $crate::macros::paste!(
> const [<$field:upper _RANGE>]: ::core::ops::RangeInclusive<u8> = $lo..=$hi;
> const [<$field:upper _MASK>]: $storage = {
> // Generate mask for shifting
> match ::core::mem::size_of::<$storage>() {
> - 1 => ::kernel::bits::genmask_u8($lo..=$hi) as $storage,
> - 2 => ::kernel::bits::genmask_u16($lo..=$hi) as $storage,
> - 4 => ::kernel::bits::genmask_u32($lo..=$hi) as $storage,
> - 8 => ::kernel::bits::genmask_u64($lo..=$hi) as $storage,
> + 1 => $crate::bits::genmask_u8($lo..=$hi) as $storage,
> + 2 => $crate::bits::genmask_u16($lo..=$hi) as $storage,
> + 4 => $crate::bits::genmask_u32($lo..=$hi) as $storage,
> + 8 => $crate::bits::genmask_u64($lo..=$hi) as $storage,
> _ => <$storage>::MAX
> }
> };
> @@ -219,7 +220,7 @@ impl $name {
> )?
> #[inline(always)]
> $vis fn $field(self) -> $res_type {
> - ::kernel::macros::paste!(
> + $crate::macros::paste!(
> const MASK: $storage = $name::[<$field:upper _MASK>];
> const SHIFT: u32 = $name::[<$field:upper _SHIFT>];
> );
> @@ -228,7 +229,7 @@ impl $name {
> $process(field)
> }
>
> - ::kernel::macros::paste!(
> + $crate::macros::paste!(
> $(
> #[doc="Sets the value of this field:"]
> #[doc=$comment]
> @@ -267,7 +268,7 @@ fn default() -> Self {
> #[allow(unused_mut)]
> let mut value = Self(Default::default());
>
> - ::kernel::macros::paste!(
> + $crate::macros::paste!(
> $(
> value.[<set_ $field>](Default::default());
> )*
> diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs
> index c859a8984bae..9c492fa10967 100644
> --- a/rust/kernel/lib.rs
> +++ b/rust/kernel/lib.rs
> @@ -64,6 +64,7 @@
> #[cfg(CONFIG_AUXILIARY_BUS)]
> pub mod auxiliary;
> pub mod bits;
> +pub mod bitstruct;
> #[cfg(CONFIG_BLOCK)]
> pub mod block;
> pub mod bug;
> @@ -112,6 +113,7 @@
> pub mod prelude;
> pub mod print;
> pub mod rbtree;
> +pub mod register;
> pub mod regulator;
> pub mod revocable;
> pub mod security;
> diff --git a/rust/kernel/prelude.rs b/rust/kernel/prelude.rs
> index 25fe97aafd02..a98c7b7ab6af 100644
> --- a/rust/kernel/prelude.rs
> +++ b/rust/kernel/prelude.rs
> @@ -39,6 +39,8 @@
>
> pub use super::static_assert;
>
> +pub use super::{bitstruct, register};
> +
> pub use super::error::{code::*, Error, Result};
>
> pub use super::{str::CStr, ThisModule};
> diff --git a/drivers/gpu/nova-core/regs/macros.rs b/rust/kernel/register.rs
> similarity index 90%
> rename from drivers/gpu/nova-core/regs/macros.rs
> rename to rust/kernel/register.rs
> index 22a53a73b765..1f48c5335e70 100644
> --- a/drivers/gpu/nova-core/regs/macros.rs
> +++ b/rust/kernel/register.rs
> @@ -16,7 +16,8 @@
> /// The `T` generic argument is used to distinguish which base to use, in case a type provides
> /// several bases. It is given to the `register!` macro to restrict the use of the register to
> /// implementors of this particular variant.
> -pub(crate) trait RegisterBase<T> {
> +pub trait RegisterBase<T> {
> + /// The base address for the register.
> const BASE: usize;
> }
>
> @@ -281,6 +282,7 @@ pub(crate) trait RegisterBase<T> {
> /// # Ok(())
> /// # }
> /// ```
> +#[macro_export]
> macro_rules! register {
> // Creates a register at a fixed offset of the MMIO space.
> ($name:ident @ $offset:literal $(, $comment:literal)? { $($fields:tt)* } ) => {
> @@ -378,7 +380,7 @@ impl $name {
> /// Read the register from its address in `io`.
> #[inline(always)]
> pub(crate) fn read<const SIZE: usize, T>(io: &T) -> Self where
> - T: ::core::ops::Deref<Target = ::kernel::io::Io<SIZE>>,
> + T: ::core::ops::Deref<Target = $crate::io::Io<SIZE>>,
> {
> Self(io.read32($offset))
> }
> @@ -386,7 +388,7 @@ pub(crate) fn read<const SIZE: usize, T>(io: &T) -> Self where
> /// Write the value contained in `self` to the register address in `io`.
> #[inline(always)]
> pub(crate) fn write<const SIZE: usize, T>(self, io: &T) where
> - T: ::core::ops::Deref<Target = ::kernel::io::Io<SIZE>>,
> + T: ::core::ops::Deref<Target = $crate::io::Io<SIZE>>,
> {
> io.write32(self.0, $offset)
> }
> @@ -398,7 +400,7 @@ pub(crate) fn alter<const SIZE: usize, T, F>(
> io: &T,
> f: F,
> ) where
> - T: ::core::ops::Deref<Target = ::kernel::io::Io<SIZE>>,
> + T: ::core::ops::Deref<Target = $crate::io::Io<SIZE>>,
> F: ::core::ops::FnOnce(Self) -> Self,
> {
> let reg = f(Self::read(io));
> @@ -421,13 +423,13 @@ pub(crate) fn read<const SIZE: usize, T, B>(
> #[allow(unused_variables)]
> base: &B,
> ) -> Self where
> - T: ::core::ops::Deref<Target = ::kernel::io::Io<SIZE>>,
> - B: crate::regs::macros::RegisterBase<$base>,
> + T: ::core::ops::Deref<Target = $crate::io::Io<SIZE>>,
> + B: $crate::register::RegisterBase<$base>,
> {
> const OFFSET: usize = $name::OFFSET;
>
> let value = io.read32(
> - <B as crate::regs::macros::RegisterBase<$base>>::BASE + OFFSET
> + <B as $crate::register::RegisterBase<$base>>::BASE + OFFSET
> );
>
> Self(value)
> @@ -442,14 +444,14 @@ pub(crate) fn write<const SIZE: usize, T, B>(
> #[allow(unused_variables)]
> base: &B,
> ) where
> - T: ::core::ops::Deref<Target = ::kernel::io::Io<SIZE>>,
> - B: crate::regs::macros::RegisterBase<$base>,
> + T: ::core::ops::Deref<Target = $crate::io::Io<SIZE>>,
> + B: $crate::register::RegisterBase<$base>,
> {
> const OFFSET: usize = $name::OFFSET;
>
> io.write32(
> self.0,
> - <B as crate::regs::macros::RegisterBase<$base>>::BASE + OFFSET
> + <B as $crate::register::RegisterBase<$base>>::BASE + OFFSET
> );
> }
>
> @@ -462,8 +464,8 @@ pub(crate) fn alter<const SIZE: usize, T, B, F>(
> base: &B,
> f: F,
> ) where
> - T: ::core::ops::Deref<Target = ::kernel::io::Io<SIZE>>,
> - B: crate::regs::macros::RegisterBase<$base>,
> + T: ::core::ops::Deref<Target = $crate::io::Io<SIZE>>,
> + B: $crate::register::RegisterBase<$base>,
> F: ::core::ops::FnOnce(Self) -> Self,
> {
> let reg = f(Self::read(io, base));
> @@ -486,7 +488,7 @@ pub(crate) fn read<const SIZE: usize, T>(
> io: &T,
> idx: usize,
> ) -> Self where
> - T: ::core::ops::Deref<Target = ::kernel::io::Io<SIZE>>,
> + T: ::core::ops::Deref<Target = $crate::io::Io<SIZE>>,
> {
> build_assert!(idx < Self::SIZE);
>
> @@ -503,7 +505,7 @@ pub(crate) fn write<const SIZE: usize, T>(
> io: &T,
> idx: usize
> ) where
> - T: ::core::ops::Deref<Target = ::kernel::io::Io<SIZE>>,
> + T: ::core::ops::Deref<Target = $crate::io::Io<SIZE>>,
> {
> build_assert!(idx < Self::SIZE);
>
> @@ -520,7 +522,7 @@ pub(crate) fn alter<const SIZE: usize, T, F>(
> idx: usize,
> f: F,
> ) where
> - T: ::core::ops::Deref<Target = ::kernel::io::Io<SIZE>>,
> + T: ::core::ops::Deref<Target = $crate::io::Io<SIZE>>,
> F: ::core::ops::FnOnce(Self) -> Self,
> {
> let reg = f(Self::read(io, idx));
> @@ -535,13 +537,13 @@ pub(crate) fn alter<const SIZE: usize, T, F>(
> pub(crate) fn try_read<const SIZE: usize, T>(
> io: &T,
> idx: usize,
> - ) -> ::kernel::error::Result<Self> where
> - T: ::core::ops::Deref<Target = ::kernel::io::Io<SIZE>>,
> + ) -> $crate::error::Result<Self> where
> + T: ::core::ops::Deref<Target = $crate::io::Io<SIZE>>,
> {
> if idx < Self::SIZE {
> Ok(Self::read(io, idx))
> } else {
> - Err(EINVAL)
> + Err($crate::error::code::EINVAL)
> }
> }
>
> @@ -554,13 +556,13 @@ pub(crate) fn try_write<const SIZE: usize, T>(
> self,
> io: &T,
> idx: usize,
> - ) -> ::kernel::error::Result where
> - T: ::core::ops::Deref<Target = ::kernel::io::Io<SIZE>>,
> + ) -> $crate::error::Result where
> + T: ::core::ops::Deref<Target = $crate::io::Io<SIZE>>,
> {
> if idx < Self::SIZE {
> Ok(self.write(io, idx))
> } else {
> - Err(EINVAL)
> + Err($crate::error::code::EINVAL)
> }
> }
>
> @@ -574,14 +576,14 @@ pub(crate) fn try_alter<const SIZE: usize, T, F>(
> io: &T,
> idx: usize,
> f: F,
> - ) -> ::kernel::error::Result where
> - T: ::core::ops::Deref<Target = ::kernel::io::Io<SIZE>>,
> + ) -> $crate::error::Result where
> + T: ::core::ops::Deref<Target = $crate::io::Io<SIZE>>,
> F: ::core::ops::FnOnce(Self) -> Self,
> {
> if idx < Self::SIZE {
> Ok(Self::alter(io, idx, f))
> } else {
> - Err(EINVAL)
> + Err($crate::error::code::EINVAL)
> }
> }
> }
> @@ -607,12 +609,12 @@ pub(crate) fn read<const SIZE: usize, T, B>(
> base: &B,
> idx: usize,
> ) -> Self where
> - T: ::core::ops::Deref<Target = ::kernel::io::Io<SIZE>>,
> - B: crate::regs::macros::RegisterBase<$base>,
> + T: ::core::ops::Deref<Target = $crate::io::Io<SIZE>>,
> + B: $crate::register::RegisterBase<$base>,
> {
> build_assert!(idx < Self::SIZE);
>
> - let offset = <B as crate::regs::macros::RegisterBase<$base>>::BASE +
> + let offset = <B as $crate::register::RegisterBase<$base>>::BASE +
> Self::OFFSET + (idx * Self::STRIDE);
> let value = io.read32(offset);
>
> @@ -629,12 +631,12 @@ pub(crate) fn write<const SIZE: usize, T, B>(
> base: &B,
> idx: usize
> ) where
> - T: ::core::ops::Deref<Target = ::kernel::io::Io<SIZE>>,
> - B: crate::regs::macros::RegisterBase<$base>,
> + T: ::core::ops::Deref<Target = $crate::io::Io<SIZE>>,
> + B: $crate::register::RegisterBase<$base>,
> {
> build_assert!(idx < Self::SIZE);
>
> - let offset = <B as crate::regs::macros::RegisterBase<$base>>::BASE +
> + let offset = <B as $crate::register::RegisterBase<$base>>::BASE +
> Self::OFFSET + (idx * Self::STRIDE);
>
> io.write32(self.0, offset);
> @@ -650,8 +652,8 @@ pub(crate) fn alter<const SIZE: usize, T, B, F>(
> idx: usize,
> f: F,
> ) where
> - T: ::core::ops::Deref<Target = ::kernel::io::Io<SIZE>>,
> - B: crate::regs::macros::RegisterBase<$base>,
> + T: ::core::ops::Deref<Target = $crate::io::Io<SIZE>>,
> + B: $crate::register::RegisterBase<$base>,
> F: ::core::ops::FnOnce(Self) -> Self,
> {
> let reg = f(Self::read(io, base, idx));
> @@ -668,14 +670,14 @@ pub(crate) fn try_read<const SIZE: usize, T, B>(
> io: &T,
> base: &B,
> idx: usize,
> - ) -> ::kernel::error::Result<Self> where
> - T: ::core::ops::Deref<Target = ::kernel::io::Io<SIZE>>,
> - B: crate::regs::macros::RegisterBase<$base>,
> + ) -> $crate::error::Result<Self> where
> + T: ::core::ops::Deref<Target = $crate::io::Io<SIZE>>,
> + B: $crate::register::RegisterBase<$base>,
> {
> if idx < Self::SIZE {
> Ok(Self::read(io, base, idx))
> } else {
> - Err(EINVAL)
> + Err($crate::error::code::EINVAL)
> }
> }
>
> @@ -690,14 +692,14 @@ pub(crate) fn try_write<const SIZE: usize, T, B>(
> io: &T,
> base: &B,
> idx: usize,
> - ) -> ::kernel::error::Result where
> - T: ::core::ops::Deref<Target = ::kernel::io::Io<SIZE>>,
> - B: crate::regs::macros::RegisterBase<$base>,
> + ) -> $crate::error::Result where
> + T: ::core::ops::Deref<Target = $crate::io::Io<SIZE>>,
> + B: $crate::register::RegisterBase<$base>,
> {
> if idx < Self::SIZE {
> Ok(self.write(io, base, idx))
> } else {
> - Err(EINVAL)
> + Err($crate::error::code::EINVAL)
> }
> }
>
> @@ -713,17 +715,19 @@ pub(crate) fn try_alter<const SIZE: usize, T, B, F>(
> base: &B,
> idx: usize,
> f: F,
> - ) -> ::kernel::error::Result where
> - T: ::core::ops::Deref<Target = ::kernel::io::Io<SIZE>>,
> - B: crate::regs::macros::RegisterBase<$base>,
> + ) -> $crate::error::Result where
> + T: ::core::ops::Deref<Target = $crate::io::Io<SIZE>>,
> + B: $crate::register::RegisterBase<$base>,
> F: ::core::ops::FnOnce(Self) -> Self,
> {
> if idx < Self::SIZE {
> Ok(Self::alter(io, base, idx, f))
> } else {
> - Err(EINVAL)
> + Err($crate::error::code::EINVAL)
> }
> }
> }
> };
> }
> +
> +pub use register;
> --
> 2.34.1
>
>
Reviewed-by: Elle Rhumsaa <elle@...thered-steel.dev>
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