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rust: Introduce atomic API helpers

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In order to support LKMM atomics in Rust, add rust_helper_* for atomic
APIs. These helpers ensure the implementation of LKMM atomics in Rust is
the same as in C. This could save the maintenance burden of having two
similar atomic implementations in asm.

Originally-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/all/20250719030827.61357-2-boqun.feng@gmail.com/
This commit is contained in:
Boqun Feng
2025-09-04 21:41:28 -07:00
committed by Peter Zijlstra
parent 76eeb9b8de
commit fdd7c7e0d2
4 changed files with 1109 additions and 0 deletions
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1040
rust/helpers/atomic.c Normal file
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1
rust/helpers/helpers.c
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@@ -7,6 +7,7 @@
* Sorted alphabetically.
*/
#include "atomic.c"
#include "auxiliary.c"
#include "blk.c"
#include "bug.c"

1
scripts/atomic/gen-atomics.sh
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@@ -11,6 +11,7 @@ cat <<EOF |
gen-atomic-instrumented.sh linux/atomic/atomic-instrumented.h
gen-atomic-long.sh linux/atomic/atomic-long.h
gen-atomic-fallback.sh linux/atomic/atomic-arch-fallback.h
gen-rust-atomic-helpers.sh ../rust/helpers/atomic.c
EOF
while read script header args; do
/bin/sh ${ATOMICDIR}/${script} ${ATOMICTBL} ${args} > ${LINUXDIR}/include/${header}

67
scripts/atomic/gen-rust-atomic-helpers.sh Executable file
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@@ -0,0 +1,67 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
ATOMICDIR=$(dirname $0)
. ${ATOMICDIR}/atomic-tbl.sh
#gen_proto_order_variant(meta, pfx, name, sfx, order, atomic, int, arg...)
gen_proto_order_variant()
{
local meta="$1"; shift
local pfx="$1"; shift
local name="$1"; shift
local sfx="$1"; shift
local order="$1"; shift
local atomic="$1"; shift
local int="$1"; shift
local atomicname="${atomic}_${pfx}${name}${sfx}${order}"
local ret="$(gen_ret_type "${meta}" "${int}")"
local params="$(gen_params "${int}" "${atomic}" "$@")"
local args="$(gen_args "$@")"
local retstmt="$(gen_ret_stmt "${meta}")"
cat <<EOF
__rust_helper ${ret}
rust_helper_${atomicname}(${params})
{
${retstmt}${atomicname}(${args});
}
EOF
}
cat << EOF
// SPDX-License-Identifier: GPL-2.0
// Generated by $0
// DO NOT MODIFY THIS FILE DIRECTLY
/*
* This file provides helpers for the various atomic functions for Rust.
*/
#ifndef _RUST_ATOMIC_API_H
#define _RUST_ATOMIC_API_H
#include <linux/atomic.h>
// TODO: Remove this after INLINE_HELPERS support is added.
#ifndef __rust_helper
#define __rust_helper
#endif
EOF
grep '^[a-z]' "$1" | while read name meta args; do
gen_proto "${meta}" "${name}" "atomic" "int" ${args}
done
grep '^[a-z]' "$1" | while read name meta args; do
gen_proto "${meta}" "${name}" "atomic64" "s64" ${args}
done
cat <<EOF
#endif /* _RUST_ATOMIC_API_H */
EOF