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Message-Id: <20250920182232.2095101-4-joelagnelf@nvidia.com>
Date: Sat, 20 Sep 2025 14:22:29 -0400
From: Joel Fernandes <joelagnelf@...dia.com>
To: linux-kernel@...r.kernel.org,
rust-for-linux@...r.kernel.org,
dri-devel@...ts.freedesktop.org,
dakr@...nel.org,
acourbot@...dia.com
Cc: 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>,
Joel Fernandes <joelagnelf@...dia.com>,
Timur Tabi <ttabi@...dia.com>,
joel@...lfernandes.org,
Elle Rhumsaa <elle@...thered-steel.dev>,
Yury Norov <yury.norov@...il.com>,
Daniel Almeida <daniel.almeida@...labora.com>,
nouveau@...ts.freedesktop.org
Subject: [PATCH v4 3/6] nova-core: bitfield: Add support for custom visiblity
Add support for custom visiblity to allow for users to control visibility
of the structure and helpers.
Reviewed-by: Elle Rhumsaa <elle@...thered-steel.dev>
Signed-off-by: Joel Fernandes <joelagnelf@...dia.com>
---
drivers/gpu/nova-core/bitfield.rs | 55 ++++++++++++++++------------
drivers/gpu/nova-core/regs/macros.rs | 16 ++++----
2 files changed, 40 insertions(+), 31 deletions(-)
diff --git a/drivers/gpu/nova-core/bitfield.rs b/drivers/gpu/nova-core/bitfield.rs
index 687ef234be75..9c022fc2bd6a 100644
--- a/drivers/gpu/nova-core/bitfield.rs
+++ b/drivers/gpu/nova-core/bitfield.rs
@@ -51,7 +51,7 @@
//! }
//!
//! bitfield! {
-//! struct ControlReg: u32 {
+//! pub struct ControlReg: u32 {
//! 3:0 mode as u8 ?=> Mode;
//! 7 state as bool => State;
//! }
@@ -65,6 +65,9 @@
//! struct's storage size.
//! - Debug and Default implementations
//!
+//! Note: Field accessors and setters inherit the same visibility as the struct itself.
+//! In the example above, both `mode()` and `set_mode()` methods will be `pub`.
+//!
//! The field setters can be used with the builder pattern, example:
//! ControlReg::default().set_mode(mode).set_state(state);
//!
@@ -79,21 +82,21 @@
//!
macro_rules! bitfield {
// Main entry point - defines the bitfield struct with fields
- (struct $name:ident : $storage:ty $(, $comment:literal)? { $($fields:tt)* }) => {
- bitfield!(@core $name $storage $(, $comment)? { $($fields)* });
+ ($vis:vis struct $name:ident : $storage:ty $(, $comment:literal)? { $($fields:tt)* }) => {
+ bitfield!(@core $vis $name $storage $(, $comment)? { $($fields)* });
};
// All rules below are helpers.
// Defines the wrapper `$name` type, as well as its relevant implementations (`Debug`,
// `Default`, `BitOr`, and conversion to the value type) and field accessor methods.
- (@core $name:ident $storage:ty $(, $comment:literal)? { $($fields:tt)* }) => {
+ (@core $vis:vis $name:ident $storage:ty $(, $comment:literal)? { $($fields:tt)* }) => {
$(
#[doc=$comment]
)?
#[repr(transparent)]
#[derive(Clone, Copy)]
- pub(crate) struct $name($storage);
+ $vis struct $name($storage);
impl ::core::ops::BitOr for $name {
type Output = Self;
@@ -115,14 +118,14 @@ fn from(val: $storage) -> Self {
}
}
- bitfield!(@fields_dispatcher $name $storage { $($fields)* });
+ bitfield!(@fields_dispatcher $vis $name $storage { $($fields)* });
};
// Captures the fields and passes them to all the implementers that require field information.
//
// Used to simplify the matching rules for implementers, so they don't need to match the entire
// complex fields rule even though they only make use of part of it.
- (@fields_dispatcher $name:ident $storage:ty {
+ (@fields_dispatcher $vis:vis $name:ident $storage:ty {
$($hi:tt:$lo:tt $field:ident as $type:tt
$(?=> $try_into_type:ty)?
$(=> $into_type:ty)?
@@ -131,7 +134,7 @@ fn from(val: $storage) -> Self {
)*
}
) => {
- bitfield!(@field_accessors $name $storage {
+ bitfield!(@field_accessors $vis $name $storage {
$(
$hi:$lo $field as $type
$(?=> $try_into_type)?
@@ -146,7 +149,7 @@ fn from(val: $storage) -> Self {
// Defines all the field getter/setter methods for `$name`.
(
- @field_accessors $name:ident $storage:ty {
+ @field_accessors $vis:vis $name:ident $storage:ty {
$($hi:tt:$lo:tt $field:ident as $type:tt
$(?=> $try_into_type:ty)?
$(=> $into_type:ty)?
@@ -161,8 +164,14 @@ fn from(val: $storage) -> Self {
#[allow(dead_code)]
impl $name {
+ /// Returns the raw underlying value
+ #[inline(always)]
+ $vis fn raw(&self) -> $storage {
+ self.0
+ }
+
$(
- bitfield!(@field_accessor $name $storage, $hi:$lo $field as $type
+ bitfield!(@field_accessor $vis $name $storage, $hi:$lo $field as $type
$(?=> $try_into_type)?
$(=> $into_type)?
$(, $comment)?
@@ -196,11 +205,11 @@ impl $name {
// Catches fields defined as `bool` and convert them into a boolean value.
(
- @field_accessor $name:ident $storage:ty, $hi:tt:$lo:tt $field:ident as bool => $into_type:ty
+ @field_accessor $vis:vis $name:ident $storage:ty, $hi:tt:$lo:tt $field:ident as bool => $into_type:ty
$(, $comment:literal)?;
) => {
bitfield!(
- @leaf_accessor $name $storage, $hi:$lo $field
+ @leaf_accessor $vis $name $storage, $hi:$lo $field
{ |f| <$into_type>::from(if f != 0 { true } else { false }) }
$into_type => $into_type $(, $comment)?;
);
@@ -208,17 +217,17 @@ impl $name {
// Shortcut for fields defined as `bool` without the `=>` syntax.
(
- @field_accessor $name:ident $storage:ty, $hi:tt:$lo:tt $field:ident as bool $(, $comment:literal)?;
+ @field_accessor $vis:vis $name:ident $storage:ty, $hi:tt:$lo:tt $field:ident as bool $(, $comment:literal)?;
) => {
- bitfield!(@field_accessor $name $storage, $hi:$lo $field as bool => bool $(, $comment)?;);
+ bitfield!(@field_accessor $vis $name $storage, $hi:$lo $field as bool => bool $(, $comment)?;);
};
// Catches the `?=>` syntax for non-boolean fields.
(
- @field_accessor $name:ident $storage:ty, $hi:tt:$lo:tt $field:ident as $type:tt ?=> $try_into_type:ty
+ @field_accessor $vis:vis $name:ident $storage:ty, $hi:tt:$lo:tt $field:ident as $type:tt ?=> $try_into_type:ty
$(, $comment:literal)?;
) => {
- bitfield!(@leaf_accessor $name $storage, $hi:$lo $field
+ bitfield!(@leaf_accessor $vis $name $storage, $hi:$lo $field
{ |f| <$try_into_type>::try_from(f as $type) } $try_into_type =>
::core::result::Result<
$try_into_type,
@@ -229,24 +238,24 @@ impl $name {
// Catches the `=>` syntax for non-boolean fields.
(
- @field_accessor $name:ident $storage:ty, $hi:tt:$lo:tt $field:ident as $type:tt => $into_type:ty
+ @field_accessor $vis:vis $name:ident $storage:ty, $hi:tt:$lo:tt $field:ident as $type:tt => $into_type:ty
$(, $comment:literal)?;
) => {
- bitfield!(@leaf_accessor $name $storage, $hi:$lo $field
+ bitfield!(@leaf_accessor $vis $name $storage, $hi:$lo $field
{ |f| <$into_type>::from(f as $type) } $into_type => $into_type $(, $comment)?;);
};
// Shortcut for non-boolean fields defined without the `=>` or `?=>` syntax.
(
- @field_accessor $name:ident $storage:ty, $hi:tt:$lo:tt $field:ident as $type:tt
+ @field_accessor $vis:vis $name:ident $storage:ty, $hi:tt:$lo:tt $field:ident as $type:tt
$(, $comment:literal)?;
) => {
- bitfield!(@field_accessor $name $storage, $hi:$lo $field as $type => $type $(, $comment)?;);
+ bitfield!(@field_accessor $vis $name $storage, $hi:$lo $field as $type => $type $(, $comment)?;);
};
// Generates the accessor methods for a single field.
(
- @leaf_accessor $name:ident $storage:ty, $hi:tt:$lo:tt $field:ident
+ @leaf_accessor $vis:vis $name:ident $storage:ty, $hi:tt:$lo:tt $field:ident
{ $process:expr } $to_type:ty => $res_type:ty $(, $comment:literal)?;
) => {
::kernel::macros::paste!(
@@ -269,7 +278,7 @@ impl $name {
#[doc=$comment]
)?
#[inline(always)]
- pub(crate) fn $field(self) -> $res_type {
+ $vis fn $field(self) -> $res_type {
::kernel::macros::paste!(
const MASK: $storage = $name::[<$field:upper _MASK>];
const SHIFT: u32 = $name::[<$field:upper _SHIFT>];
@@ -285,7 +294,7 @@ pub(crate) fn $field(self) -> $res_type {
#[doc=$comment]
)?
#[inline(always)]
- pub(crate) fn [<set_ $field>](mut self, value: $to_type) -> Self {
+ $vis fn [<set_ $field>](mut self, value: $to_type) -> Self {
const MASK: $storage = $name::[<$field:upper _MASK>];
const SHIFT: u32 = $name::[<$field:upper _SHIFT>];
let value = (<$storage>::from(value) << SHIFT) & MASK;
diff --git a/drivers/gpu/nova-core/regs/macros.rs b/drivers/gpu/nova-core/regs/macros.rs
index d34c7f37fb93..6a4f3271beb3 100644
--- a/drivers/gpu/nova-core/regs/macros.rs
+++ b/drivers/gpu/nova-core/regs/macros.rs
@@ -276,25 +276,25 @@ pub(crate) trait RegisterBase<T> {
macro_rules! register {
// Creates a register at a fixed offset of the MMIO space.
($name:ident @ $offset:literal $(, $comment:literal)? { $($fields:tt)* } ) => {
- bitfield!(struct $name: u32 $(, $comment)? { $($fields)* } );
+ bitfield!(pub(crate) struct $name: u32 $(, $comment)? { $($fields)* } );
register!(@io_fixed $name @ $offset);
};
// Creates an alias register of fixed offset register `alias` with its own fields.
($name:ident => $alias:ident $(, $comment:literal)? { $($fields:tt)* } ) => {
- bitfield!(struct $name: u32 $(, $comment)? { $($fields)* } );
+ bitfield!(pub(crate) struct $name: u32 $(, $comment)? { $($fields)* } );
register!(@io_fixed $name @ $alias::OFFSET);
};
// Creates a register at a relative offset from a base address provider.
($name:ident @ $base:ty [ $offset:literal ] $(, $comment:literal)? { $($fields:tt)* } ) => {
- bitfield!(struct $name: u32 $(, $comment)? { $($fields)* } );
+ bitfield!(pub(crate) struct $name: u32 $(, $comment)? { $($fields)* } );
register!(@io_relative $name @ $base [ $offset ]);
};
// Creates an alias register of relative offset register `alias` with its own fields.
($name:ident => $base:ty [ $alias:ident ] $(, $comment:literal)? { $($fields:tt)* }) => {
- bitfield!(struct $name: u32 $(, $comment)? { $($fields)* } );
+ bitfield!(pub(crate) struct $name: u32 $(, $comment)? { $($fields)* } );
register!(@io_relative $name @ $base [ $alias::OFFSET ]);
};
@@ -305,7 +305,7 @@ macro_rules! register {
}
) => {
static_assert!(::core::mem::size_of::<u32>() <= $stride);
- bitfield!(struct $name: u32 $(, $comment)? { $($fields)* } );
+ bitfield!(pub(crate) struct $name: u32 $(, $comment)? { $($fields)* } );
register!(@io_array $name @ $offset [ $size ; $stride ]);
};
@@ -326,7 +326,7 @@ macro_rules! register {
$(, $comment:literal)? { $($fields:tt)* }
) => {
static_assert!(::core::mem::size_of::<u32>() <= $stride);
- bitfield!(struct $name: u32 $(, $comment)? { $($fields)* } );
+ bitfield!(pub(crate) struct $name: u32 $(, $comment)? { $($fields)* } );
register!(@io_relative_array $name @ $base [ $offset [ $size ; $stride ] ]);
};
@@ -348,7 +348,7 @@ macro_rules! register {
}
) => {
static_assert!($idx < $alias::SIZE);
- bitfield!(struct $name: u32 $(, $comment)? { $($fields)* } );
+ bitfield!(pub(crate) struct $name: u32 $(, $comment)? { $($fields)* } );
register!(@io_relative $name @ $base [ $alias::OFFSET + $idx * $alias::STRIDE ] );
};
@@ -357,7 +357,7 @@ macro_rules! register {
// to avoid it being interpreted in place of the relative register array alias rule.
($name:ident => $alias:ident [ $idx:expr ] $(, $comment:literal)? { $($fields:tt)* }) => {
static_assert!($idx < $alias::SIZE);
- bitfield!(struct $name: u32 $(, $comment)? { $($fields)* } );
+ bitfield!(pub(crate) struct $name: u32 $(, $comment)? { $($fields)* } );
register!(@io_fixed $name @ $alias::OFFSET + $idx * $alias::STRIDE );
};
--
2.34.1
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