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![Uros Bizjak](/assets/img/avatar_default.png)
Add generic support for try_cmpxchg64{,_acquire,_release,_relaxed} and their falbacks involving cmpxchg64. Signed-off-by: Uros Bizjak <ubizjak@gmail.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20220515184205.103089-2-ubizjak@gmail.com
245 lines
5.7 KiB
Bash
Executable file
245 lines
5.7 KiB
Bash
Executable file
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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ATOMICDIR=$(dirname $0)
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. ${ATOMICDIR}/atomic-tbl.sh
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#gen_template_fallback(template, meta, pfx, name, sfx, order, atomic, int, args...)
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gen_template_fallback()
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{
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local template="$1"; shift
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local meta="$1"; shift
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local pfx="$1"; shift
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local name="$1"; shift
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local sfx="$1"; shift
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local order="$1"; shift
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local atomic="$1"; shift
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local int="$1"; shift
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local atomicname="arch_${atomic}_${pfx}${name}${sfx}${order}"
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local ret="$(gen_ret_type "${meta}" "${int}")"
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local retstmt="$(gen_ret_stmt "${meta}")"
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local params="$(gen_params "${int}" "${atomic}" "$@")"
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local args="$(gen_args "$@")"
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if [ ! -z "${template}" ]; then
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printf "#ifndef ${atomicname}\n"
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. ${template}
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printf "#define ${atomicname} ${atomicname}\n"
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printf "#endif\n\n"
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fi
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}
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#gen_proto_fallback(meta, pfx, name, sfx, order, atomic, int, args...)
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gen_proto_fallback()
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{
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local meta="$1"; shift
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local pfx="$1"; shift
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local name="$1"; shift
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local sfx="$1"; shift
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local order="$1"; shift
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local tmpl="$(find_fallback_template "${pfx}" "${name}" "${sfx}" "${order}")"
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gen_template_fallback "${tmpl}" "${meta}" "${pfx}" "${name}" "${sfx}" "${order}" "$@"
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}
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#gen_basic_fallbacks(basename)
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gen_basic_fallbacks()
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{
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local basename="$1"; shift
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cat << EOF
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#define ${basename}_acquire ${basename}
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#define ${basename}_release ${basename}
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#define ${basename}_relaxed ${basename}
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EOF
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}
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gen_proto_order_variant()
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{
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local meta="$1"; shift
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local pfx="$1"; shift
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local name="$1"; shift
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local sfx="$1"; shift
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local order="$1"; shift
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local atomic="$1"
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local basename="arch_${atomic}_${pfx}${name}${sfx}"
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printf "#define ${basename}${order} ${basename}${order}\n"
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}
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#gen_proto_order_variants(meta, pfx, name, sfx, atomic, int, args...)
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gen_proto_order_variants()
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{
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local meta="$1"; shift
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local pfx="$1"; shift
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local name="$1"; shift
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local sfx="$1"; shift
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local atomic="$1"
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local basename="arch_${atomic}_${pfx}${name}${sfx}"
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local template="$(find_fallback_template "${pfx}" "${name}" "${sfx}" "${order}")"
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# If we don't have relaxed atomics, then we don't bother with ordering fallbacks
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# read_acquire and set_release need to be templated, though
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if ! meta_has_relaxed "${meta}"; then
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gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"
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if meta_has_acquire "${meta}"; then
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gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
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fi
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if meta_has_release "${meta}"; then
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gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
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fi
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return
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fi
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printf "#ifndef ${basename}_relaxed\n"
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if [ ! -z "${template}" ]; then
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printf "#ifdef ${basename}\n"
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fi
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gen_basic_fallbacks "${basename}"
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if [ ! -z "${template}" ]; then
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printf "#endif /* ${basename} */\n\n"
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gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"
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gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
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gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
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gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_relaxed" "$@"
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fi
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printf "#else /* ${basename}_relaxed */\n\n"
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gen_template_fallback "${ATOMICDIR}/fallbacks/acquire" "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
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gen_template_fallback "${ATOMICDIR}/fallbacks/release" "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
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gen_template_fallback "${ATOMICDIR}/fallbacks/fence" "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"
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printf "#endif /* ${basename}_relaxed */\n\n"
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}
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gen_order_fallbacks()
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{
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local xchg="$1"; shift
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cat <<EOF
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#ifndef ${xchg}_acquire
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#define ${xchg}_acquire(...) \\
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__atomic_op_acquire(${xchg}, __VA_ARGS__)
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#endif
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#ifndef ${xchg}_release
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#define ${xchg}_release(...) \\
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__atomic_op_release(${xchg}, __VA_ARGS__)
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#endif
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#ifndef ${xchg}
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#define ${xchg}(...) \\
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__atomic_op_fence(${xchg}, __VA_ARGS__)
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#endif
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EOF
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}
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gen_xchg_fallbacks()
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{
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local xchg="$1"; shift
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printf "#ifndef ${xchg}_relaxed\n"
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gen_basic_fallbacks ${xchg}
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printf "#else /* ${xchg}_relaxed */\n"
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gen_order_fallbacks ${xchg}
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printf "#endif /* ${xchg}_relaxed */\n\n"
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}
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gen_try_cmpxchg_fallback()
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{
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local cmpxchg="$1"; shift;
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local order="$1"; shift;
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cat <<EOF
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#ifndef arch_try_${cmpxchg}${order}
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#define arch_try_${cmpxchg}${order}(_ptr, _oldp, _new) \\
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({ \\
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typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \\
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___r = arch_${cmpxchg}${order}((_ptr), ___o, (_new)); \\
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if (unlikely(___r != ___o)) \\
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*___op = ___r; \\
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likely(___r == ___o); \\
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})
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#endif /* arch_try_${cmpxchg}${order} */
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EOF
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}
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gen_try_cmpxchg_fallbacks()
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{
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local cmpxchg="$1"; shift;
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printf "#ifndef arch_try_${cmpxchg}_relaxed\n"
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printf "#ifdef arch_try_${cmpxchg}\n"
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gen_basic_fallbacks "arch_try_${cmpxchg}"
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printf "#endif /* arch_try_${cmpxchg} */\n\n"
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for order in "" "_acquire" "_release" "_relaxed"; do
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gen_try_cmpxchg_fallback "${cmpxchg}" "${order}"
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done
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printf "#else /* arch_try_${cmpxchg}_relaxed */\n"
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gen_order_fallbacks "arch_try_${cmpxchg}"
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printf "#endif /* arch_try_${cmpxchg}_relaxed */\n\n"
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}
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cat << EOF
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// SPDX-License-Identifier: GPL-2.0
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// Generated by $0
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// DO NOT MODIFY THIS FILE DIRECTLY
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#ifndef _LINUX_ATOMIC_FALLBACK_H
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#define _LINUX_ATOMIC_FALLBACK_H
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#include <linux/compiler.h>
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EOF
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for xchg in "arch_xchg" "arch_cmpxchg" "arch_cmpxchg64"; do
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gen_xchg_fallbacks "${xchg}"
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done
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for cmpxchg in "cmpxchg" "cmpxchg64"; do
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gen_try_cmpxchg_fallbacks "${cmpxchg}"
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done
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grep '^[a-z]' "$1" | while read name meta args; do
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gen_proto "${meta}" "${name}" "atomic" "int" ${args}
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done
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cat <<EOF
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#ifdef CONFIG_GENERIC_ATOMIC64
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#include <asm-generic/atomic64.h>
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#endif
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EOF
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grep '^[a-z]' "$1" | while read name meta args; do
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gen_proto "${meta}" "${name}" "atomic64" "s64" ${args}
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done
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cat <<EOF
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#endif /* _LINUX_ATOMIC_FALLBACK_H */
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EOF
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