[PATCH v2 3/4] nova-core: bitstruct: Add support for custom visiblity

Joel Fernandes
2025-09-03T21:54:46Z

Add support for custom visiblity to allow for users to control visibility
of the structure and helpers.

Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
---
drivers/gpu/nova-core/bitstruct.rs | 46 ++++++++++++++--------------
drivers/gpu/nova-core/regs/macros.rs | 16 +++++-----
2 files changed, 31 insertions(+), 31 deletions(-)

diff --git a/drivers/gpu/nova-core/bitstruct.rs b/drivers/gpu/nova-core/bitstruct.rs
index 068334c86981..1047c5c17e2d 100644
--- a/drivers/gpu/nova-core/bitstruct.rs
+++ b/drivers/gpu/nova-core/bitstruct.rs
@@ -9,7 +9,7 @@
///
/// ```rust
/// bitstruct! {
-/// struct ControlReg: u32 {
+/// pub struct ControlReg: u32 {
/// 3:0 mode as u8 ?=> Mode;
/// 7:4 state as u8 => State;
/// }
@@ -34,21 +34,21 @@
/// and returns the result. This is useful with fields for which not all values are valid.
macro_rules! bitstruct {
// Main entry point - defines the bitfield struct with fields
- (struct $name:ident : $storage:ty $(, $comment:literal)? { $($fields:tt)* }) => {
- bitstruct!(@core $name $storage $(, $comment)? { $($fields)* });
+ ($vis:vis struct $name:ident : $storage:ty $(, $comment:literal)? { $($fields:tt)* }) => {
+ bitstruct!(@core $name $vis $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 $name:ident $vis:vis $storage:ty $(, $comment:literal)? { $($fields:tt)* }) => {
$(
#[doc=$comment]
)?
#[repr(transparent)]
#[derive(Clone, Copy)]
- pub(crate) struct $name($storage);
+ $vis struct $name($vis $storage);

impl ::core::ops::BitOr for $name {
type Output = Self;
@@ -64,14 +64,14 @@ fn from(val: $name) -> $storage {
}
}

- bitstruct!(@fields_dispatcher $name $storage { $($fields)* });
+ bitstruct!(@fields_dispatcher $name $vis $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 $name:ident $vis:vis $storage:ty {
$($hi:tt:$lo:tt $field:ident as $type:tt
$(?=> $try_into_type:ty)?
$(=> $into_type:ty)?
@@ -80,7 +80,7 @@ fn from(val: $name) -> $storage {
)*
}
) => {
- bitstruct!(@field_accessors $name $storage {
+ bitstruct!(@field_accessors $name $vis $storage {
$(
$hi:$lo $field as $type
$(?=> $try_into_type)?
@@ -95,7 +95,7 @@ fn from(val: $name) -> $storage {

// Defines all the field getter/setter methods for `$name`.
(
- @field_accessors $name:ident $storage:ty {
+ @field_accessors $name:ident $vis:vis $storage:ty {
$($hi:tt:$lo:tt $field:ident as $type:tt
$(?=> $try_into_type:ty)?
$(=> $into_type:ty)?
@@ -111,7 +111,7 @@ fn from(val: $name) -> $storage {
#[allow(dead_code)]
impl $name {
$(
- bitstruct!(@field_accessor $name $storage, $hi:$lo $field as $type
+ bitstruct!(@field_accessor $name $vis $storage, $hi:$lo $field as $type
$(?=> $try_into_type)?
$(=> $into_type)?
$(, $comment)?
@@ -145,11 +145,11 @@ 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 $name:ident $vis:vis $storage:ty, $hi:tt:$lo:tt $field:ident as bool => $into_type:ty
$(, $comment:literal)?;
) => {
bitstruct!(
- @leaf_accessor $name $storage, $hi:$lo $field
+ @leaf_accessor $name $vis $storage, $hi:$lo $field
{ |f| <$into_type>::from(if f != 0 { true } else { false }) }
$into_type => $into_type $(, $comment)?;
);
@@ -157,17 +157,17 @@ 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 $name:ident $vis:vis $storage:ty, $hi:tt:$lo:tt $field:ident as bool $(, $comment:literal)?;
) => {
- bitstruct!(@field_accessor $name $storage, $hi:$lo $field as bool => bool $(, $comment)?;);
+ bitstruct!(@field_accessor $name $vis $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 $name:ident $vis:vis $storage:ty, $hi:tt:$lo:tt $field:ident as $type:tt ?=> $try_into_type:ty
$(, $comment:literal)?;
) => {
- bitstruct!(@leaf_accessor $name $storage, $hi:$lo $field
+ bitstruct!(@leaf_accessor $name $vis $storage, $hi:$lo $field
{ |f| <$try_into_type>::try_from(f as $type) } $try_into_type =>
::core::result::Result<
$try_into_type,
@@ -178,24 +178,24 @@ 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 $name:ident $vis:vis $storage:ty, $hi:tt:$lo:tt $field:ident as $type:tt => $into_type:ty
$(, $comment:literal)?;
) => {
- bitstruct!(@leaf_accessor $name $storage, $hi:$lo $field
+ bitstruct!(@leaf_accessor $name $vis $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 $name:ident $vis:vis $storage:ty, $hi:tt:$lo:tt $field:ident as $type:tt
$(, $comment:literal)?;
) => {
- bitstruct!(@field_accessor $name $storage, $hi:$lo $field as $type => $type $(, $comment)?;);
+ bitstruct!(@field_accessor $name $vis $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 $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!(
@@ -218,7 +218,7 @@ 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>];
@@ -234,7 +234,7 @@ 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 = (<$storage>::from(value) << SHIFT) & MASK;
diff --git a/drivers/gpu/nova-core/regs/macros.rs b/drivers/gpu/nova-core/regs/macros.rs
index bbfeab147c9f..22a53a73b765 100644
--- a/drivers/gpu/nova-core/regs/macros.rs
+++ b/drivers/gpu/nova-core/regs/macros.rs
@@ -284,25 +284,25 @@ pub(crate) trait RegisterBase<T> {
macro_rules! register {
// Creates a register at a fixed offset of the MMIO space.
($name:ident @ $offset:literal $(, $comment:literal)? { $($fields:tt)* } ) => {
- bitstruct!(struct $name: u32 $(, $comment)? { $($fields)* } );
+ bitstruct!(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)* } ) => {
- bitstruct!(struct $name: u32 $(, $comment)? { $($fields)* } );
+ bitstruct!(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)* } ) => {
- bitstruct!(struct $name: u32 $(, $comment)? { $($fields)* } );
+ bitstruct!(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)* }) => {
- bitstruct!(struct $name: u32 $(, $comment)? { $($fields)* } );
+ bitstruct!(pub(crate) struct $name: u32 $(, $comment)? { $($fields)* } );
register!(@io_relative $name @ $base [ $alias::OFFSET ]);
};

@@ -313,7 +313,7 @@ macro_rules! register {
}
) => {
static_assert!(::core::mem::size_of::<u32>() <= $stride);
- bitstruct!(struct $name: u32 $(, $comment)? { $($fields)* } );
+ bitstruct!(pub(crate) struct $name: u32 $(, $comment)? { $($fields)* } );
register!(@io_array $name @ $offset [ $size ; $stride ]);
};

@@ -334,7 +334,7 @@ macro_rules! register {
$(, $comment:literal)? { $($fields:tt)* }
) => {
static_assert!(::core::mem::size_of::<u32>() <= $stride);
- bitstruct!(struct $name: u32 $(, $comment)? { $($fields)* } );
+ bitstruct!(pub(crate) struct $name: u32 $(, $comment)? { $($fields)* } );
register!(@io_relative_array $name @ $base [ $offset [ $size ; $stride ] ]);
};

@@ -356,7 +356,7 @@ macro_rules! register {
}
) => {
static_assert!($idx < $alias::SIZE);
- bitstruct!(struct $name: u32 $(, $comment)? { $($fields)* } );
+ bitstruct!(pub(crate) struct $name: u32 $(, $comment)? { $($fields)* } );
register!(@io_relative $name @ $base [ $alias::OFFSET + $idx * $alias::STRIDE ] );
};

@@ -365,7 +365,7 @@ 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);
- bitstruct!(struct $name: u32 $(, $comment)? { $($fields)* } );
+ bitstruct!(pub(crate) struct $name: u32 $(, $comment)? { $($fields)* } );
register!(@io_fixed $name @ $alias::OFFSET + $idx * $alias::STRIDE );
};

--
2.34.1