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Date: Fri, 3 Feb 2023 16:55:20 +0000
From: Mark Rutland <mark.rutland@....com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: torvalds@...ux-foundation.org, corbet@....net, will@...nel.org,
boqun.feng@...il.com, catalin.marinas@....com, dennis@...nel.org,
tj@...nel.org, cl@...ux.com, hca@...ux.ibm.com, gor@...ux.ibm.com,
agordeev@...ux.ibm.com, borntraeger@...ux.ibm.com,
svens@...ux.ibm.com, tglx@...utronix.de, mingo@...hat.com,
bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org,
hpa@...or.com, joro@...tes.org, suravee.suthikulpanit@....com,
robin.murphy@....com, dwmw2@...radead.org,
baolu.lu@...ux.intel.com, Arnd Bergmann <arnd@...db.de>,
Herbert Xu <herbert@...dor.apana.org.au>, davem@...emloft.net,
penberg@...nel.org, rientjes@...gle.com, iamjoonsoo.kim@....com,
Andrew Morton <akpm@...ux-foundation.org>, vbabka@...e.cz,
roman.gushchin@...ux.dev, 42.hyeyoo@...il.com,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, linux-s390@...r.kernel.org,
iommu@...ts.linux.dev, linux-arch@...r.kernel.org,
linux-crypto@...r.kernel.org
Subject: Re: [PATCH v2 04/10] instrumentation: Wire up cmpxchg128()
On Thu, Feb 02, 2023 at 03:50:34PM +0100, Peter Zijlstra wrote:
> Wire up the cmpxchg128 familty in the atomic wrappery scripts.
s/familty/family/ (and s/wrappery/wrapper/ ?)
>
> These provide the generic cmpxchg128 family of functions from the
> arch_ prefixed version, adding explicit instrumentation where needed.
>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Mark Rutland <mark.rutland@....com>
Mark.
> ---
> include/linux/atomic/atomic-arch-fallback.h | 95 +++++++++++++++++++++++++++-
> include/linux/atomic/atomic-instrumented.h | 77 ++++++++++++++++++++++
> scripts/atomic/gen-atomic-fallback.sh | 4 -
> scripts/atomic/gen-atomic-instrumented.sh | 4 -
> 4 files changed, 174 insertions(+), 6 deletions(-)
>
> --- a/include/linux/atomic/atomic-arch-fallback.h
> +++ b/include/linux/atomic/atomic-arch-fallback.h
> @@ -77,6 +77,29 @@
>
> #endif /* arch_cmpxchg64_relaxed */
>
> +#ifndef arch_cmpxchg128_relaxed
> +#define arch_cmpxchg128_acquire arch_cmpxchg128
> +#define arch_cmpxchg128_release arch_cmpxchg128
> +#define arch_cmpxchg128_relaxed arch_cmpxchg128
> +#else /* arch_cmpxchg128_relaxed */
> +
> +#ifndef arch_cmpxchg128_acquire
> +#define arch_cmpxchg128_acquire(...) \
> + __atomic_op_acquire(arch_cmpxchg128, __VA_ARGS__)
> +#endif
> +
> +#ifndef arch_cmpxchg128_release
> +#define arch_cmpxchg128_release(...) \
> + __atomic_op_release(arch_cmpxchg128, __VA_ARGS__)
> +#endif
> +
> +#ifndef arch_cmpxchg128
> +#define arch_cmpxchg128(...) \
> + __atomic_op_fence(arch_cmpxchg128, __VA_ARGS__)
> +#endif
> +
> +#endif /* arch_cmpxchg128_relaxed */
> +
> #ifndef arch_try_cmpxchg_relaxed
> #ifdef arch_try_cmpxchg
> #define arch_try_cmpxchg_acquire arch_try_cmpxchg
> @@ -217,6 +240,76 @@
>
> #endif /* arch_try_cmpxchg64_relaxed */
>
> +#ifndef arch_try_cmpxchg128_relaxed
> +#ifdef arch_try_cmpxchg128
> +#define arch_try_cmpxchg128_acquire arch_try_cmpxchg128
> +#define arch_try_cmpxchg128_release arch_try_cmpxchg128
> +#define arch_try_cmpxchg128_relaxed arch_try_cmpxchg128
> +#endif /* arch_try_cmpxchg128 */
> +
> +#ifndef arch_try_cmpxchg128
> +#define arch_try_cmpxchg128(_ptr, _oldp, _new) \
> +({ \
> + typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \
> + ___r = arch_cmpxchg128((_ptr), ___o, (_new)); \
> + if (unlikely(___r != ___o)) \
> + *___op = ___r; \
> + likely(___r == ___o); \
> +})
> +#endif /* arch_try_cmpxchg128 */
> +
> +#ifndef arch_try_cmpxchg128_acquire
> +#define arch_try_cmpxchg128_acquire(_ptr, _oldp, _new) \
> +({ \
> + typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \
> + ___r = arch_cmpxchg128_acquire((_ptr), ___o, (_new)); \
> + if (unlikely(___r != ___o)) \
> + *___op = ___r; \
> + likely(___r == ___o); \
> +})
> +#endif /* arch_try_cmpxchg128_acquire */
> +
> +#ifndef arch_try_cmpxchg128_release
> +#define arch_try_cmpxchg128_release(_ptr, _oldp, _new) \
> +({ \
> + typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \
> + ___r = arch_cmpxchg128_release((_ptr), ___o, (_new)); \
> + if (unlikely(___r != ___o)) \
> + *___op = ___r; \
> + likely(___r == ___o); \
> +})
> +#endif /* arch_try_cmpxchg128_release */
> +
> +#ifndef arch_try_cmpxchg128_relaxed
> +#define arch_try_cmpxchg128_relaxed(_ptr, _oldp, _new) \
> +({ \
> + typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \
> + ___r = arch_cmpxchg128_relaxed((_ptr), ___o, (_new)); \
> + if (unlikely(___r != ___o)) \
> + *___op = ___r; \
> + likely(___r == ___o); \
> +})
> +#endif /* arch_try_cmpxchg128_relaxed */
> +
> +#else /* arch_try_cmpxchg128_relaxed */
> +
> +#ifndef arch_try_cmpxchg128_acquire
> +#define arch_try_cmpxchg128_acquire(...) \
> + __atomic_op_acquire(arch_try_cmpxchg128, __VA_ARGS__)
> +#endif
> +
> +#ifndef arch_try_cmpxchg128_release
> +#define arch_try_cmpxchg128_release(...) \
> + __atomic_op_release(arch_try_cmpxchg128, __VA_ARGS__)
> +#endif
> +
> +#ifndef arch_try_cmpxchg128
> +#define arch_try_cmpxchg128(...) \
> + __atomic_op_fence(arch_try_cmpxchg128, __VA_ARGS__)
> +#endif
> +
> +#endif /* arch_try_cmpxchg128_relaxed */
> +
> #ifndef arch_atomic_read_acquire
> static __always_inline int
> arch_atomic_read_acquire(const atomic_t *v)
> @@ -2456,4 +2549,4 @@ arch_atomic64_dec_if_positive(atomic64_t
> #endif
>
> #endif /* _LINUX_ATOMIC_FALLBACK_H */
> -// b5e87bdd5ede61470c29f7a7e4de781af3770f09
> +// 46357a526de89c762d30fb238f35a7d5950a670b
> --- a/include/linux/atomic/atomic-instrumented.h
> +++ b/include/linux/atomic/atomic-instrumented.h
> @@ -1968,6 +1968,36 @@ atomic_long_dec_if_positive(atomic_long_
> arch_cmpxchg64_relaxed(__ai_ptr, __VA_ARGS__); \
> })
>
> +#define cmpxchg128(ptr, ...) \
> +({ \
> + typeof(ptr) __ai_ptr = (ptr); \
> + kcsan_mb(); \
> + instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
> + arch_cmpxchg128(__ai_ptr, __VA_ARGS__); \
> +})
> +
> +#define cmpxchg128_acquire(ptr, ...) \
> +({ \
> + typeof(ptr) __ai_ptr = (ptr); \
> + instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
> + arch_cmpxchg128_acquire(__ai_ptr, __VA_ARGS__); \
> +})
> +
> +#define cmpxchg128_release(ptr, ...) \
> +({ \
> + typeof(ptr) __ai_ptr = (ptr); \
> + kcsan_release(); \
> + instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
> + arch_cmpxchg128_release(__ai_ptr, __VA_ARGS__); \
> +})
> +
> +#define cmpxchg128_relaxed(ptr, ...) \
> +({ \
> + typeof(ptr) __ai_ptr = (ptr); \
> + instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
> + arch_cmpxchg128_relaxed(__ai_ptr, __VA_ARGS__); \
> +})
> +
> #define try_cmpxchg(ptr, oldp, ...) \
> ({ \
> typeof(ptr) __ai_ptr = (ptr); \
> @@ -2044,6 +2074,44 @@ atomic_long_dec_if_positive(atomic_long_
> arch_try_cmpxchg64_relaxed(__ai_ptr, __ai_oldp, __VA_ARGS__); \
> })
>
> +#define try_cmpxchg128(ptr, oldp, ...) \
> +({ \
> + typeof(ptr) __ai_ptr = (ptr); \
> + typeof(oldp) __ai_oldp = (oldp); \
> + kcsan_mb(); \
> + instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
> + instrument_atomic_write(__ai_oldp, sizeof(*__ai_oldp)); \
> + arch_try_cmpxchg128(__ai_ptr, __ai_oldp, __VA_ARGS__); \
> +})
> +
> +#define try_cmpxchg128_acquire(ptr, oldp, ...) \
> +({ \
> + typeof(ptr) __ai_ptr = (ptr); \
> + typeof(oldp) __ai_oldp = (oldp); \
> + instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
> + instrument_atomic_write(__ai_oldp, sizeof(*__ai_oldp)); \
> + arch_try_cmpxchg128_acquire(__ai_ptr, __ai_oldp, __VA_ARGS__); \
> +})
> +
> +#define try_cmpxchg128_release(ptr, oldp, ...) \
> +({ \
> + typeof(ptr) __ai_ptr = (ptr); \
> + typeof(oldp) __ai_oldp = (oldp); \
> + kcsan_release(); \
> + instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
> + instrument_atomic_write(__ai_oldp, sizeof(*__ai_oldp)); \
> + arch_try_cmpxchg128_release(__ai_ptr, __ai_oldp, __VA_ARGS__); \
> +})
> +
> +#define try_cmpxchg128_relaxed(ptr, oldp, ...) \
> +({ \
> + typeof(ptr) __ai_ptr = (ptr); \
> + typeof(oldp) __ai_oldp = (oldp); \
> + instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
> + instrument_atomic_write(__ai_oldp, sizeof(*__ai_oldp)); \
> + arch_try_cmpxchg128_relaxed(__ai_ptr, __ai_oldp, __VA_ARGS__); \
> +})
> +
> #define cmpxchg_local(ptr, ...) \
> ({ \
> typeof(ptr) __ai_ptr = (ptr); \
> @@ -2058,6 +2126,13 @@ atomic_long_dec_if_positive(atomic_long_
> arch_cmpxchg64_local(__ai_ptr, __VA_ARGS__); \
> })
>
> +#define cmpxchg128_local(ptr, ...) \
> +({ \
> + typeof(ptr) __ai_ptr = (ptr); \
> + instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
> + arch_cmpxchg128_local(__ai_ptr, __VA_ARGS__); \
> +})
> +
> #define sync_cmpxchg(ptr, ...) \
> ({ \
> typeof(ptr) __ai_ptr = (ptr); \
> @@ -2083,4 +2158,4 @@ atomic_long_dec_if_positive(atomic_long_
> })
>
> #endif /* _LINUX_ATOMIC_INSTRUMENTED_H */
> -// 764f741eb77a7ad565dc8d99ce2837d5542e8aee
> +// 27320c1ec2bf2878ecb9df3ea4816a7bc0c57a52
> --- a/scripts/atomic/gen-atomic-fallback.sh
> +++ b/scripts/atomic/gen-atomic-fallback.sh
> @@ -217,11 +217,11 @@ cat << EOF
>
> EOF
>
> -for xchg in "arch_xchg" "arch_cmpxchg" "arch_cmpxchg64"; do
> +for xchg in "arch_xchg" "arch_cmpxchg" "arch_cmpxchg64" "arch_cmpxchg128"; do
> gen_xchg_fallbacks "${xchg}"
> done
>
> -for cmpxchg in "cmpxchg" "cmpxchg64"; do
> +for cmpxchg in "cmpxchg" "cmpxchg64" "cmpxchg128"; do
> gen_try_cmpxchg_fallbacks "${cmpxchg}"
> done
>
> --- a/scripts/atomic/gen-atomic-instrumented.sh
> +++ b/scripts/atomic/gen-atomic-instrumented.sh
> @@ -166,14 +166,14 @@ grep '^[a-z]' "$1" | while read name met
> done
>
>
> -for xchg in "xchg" "cmpxchg" "cmpxchg64" "try_cmpxchg" "try_cmpxchg64"; do
> +for xchg in "xchg" "cmpxchg" "cmpxchg64" "cmpxchg128" "try_cmpxchg" "try_cmpxchg64" "try_cmpxchg128"; do
> for order in "" "_acquire" "_release" "_relaxed"; do
> gen_xchg "${xchg}" "${order}" ""
> printf "\n"
> done
> done
>
> -for xchg in "cmpxchg_local" "cmpxchg64_local" "sync_cmpxchg"; do
> +for xchg in "cmpxchg_local" "cmpxchg64_local" "cmpxchg128_local" "sync_cmpxchg"; do
> gen_xchg "${xchg}" "" ""
> printf "\n"
> done
>
>
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