254 lines
7.1 KiB
C
254 lines
7.1 KiB
C
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/*
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* Based on arch/arm/include/asm/cmpxchg.h
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*
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_CMPXCHG_H
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#define __ASM_CMPXCHG_H
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#include <linux/build_bug.h>
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#include <linux/compiler.h>
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#include <asm/atomic.h>
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#include <asm/barrier.h>
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#include <asm/lse.h>
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/*
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* We need separate acquire parameters for ll/sc and lse, since the full
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* barrier case is generated as release+dmb for the former and
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* acquire+release for the latter.
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*/
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#define __XCHG_CASE(w, sz, name, mb, nop_lse, acq, acq_lse, rel, cl) \
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static inline unsigned long __xchg_case_##name(unsigned long x, \
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volatile void *ptr) \
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{ \
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unsigned long ret, tmp; \
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\
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asm volatile(ARM64_LSE_ATOMIC_INSN( \
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/* LL/SC */ \
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" prfm pstl1strm, %2\n" \
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"1: ld" #acq "xr" #sz "\t%" #w "0, %2\n" \
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" st" #rel "xr" #sz "\t%w1, %" #w "3, %2\n" \
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" cbnz %w1, 1b\n" \
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" " #mb, \
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/* LSE atomics */ \
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" swp" #acq_lse #rel #sz "\t%" #w "3, %" #w "0, %2\n" \
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__nops(3) \
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" " #nop_lse) \
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: "=&r" (ret), "=&r" (tmp), "+Q" (*(unsigned long *)ptr) \
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: "r" (x) \
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: cl); \
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\
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return ret; \
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}
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__XCHG_CASE(w, b, 1, , , , , , )
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__XCHG_CASE(w, h, 2, , , , , , )
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__XCHG_CASE(w, , 4, , , , , , )
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__XCHG_CASE( , , 8, , , , , , )
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__XCHG_CASE(w, b, acq_1, , , a, a, , "memory")
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__XCHG_CASE(w, h, acq_2, , , a, a, , "memory")
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__XCHG_CASE(w, , acq_4, , , a, a, , "memory")
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__XCHG_CASE( , , acq_8, , , a, a, , "memory")
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__XCHG_CASE(w, b, rel_1, , , , , l, "memory")
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__XCHG_CASE(w, h, rel_2, , , , , l, "memory")
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__XCHG_CASE(w, , rel_4, , , , , l, "memory")
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__XCHG_CASE( , , rel_8, , , , , l, "memory")
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__XCHG_CASE(w, b, mb_1, dmb ish, nop, , a, l, "memory")
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__XCHG_CASE(w, h, mb_2, dmb ish, nop, , a, l, "memory")
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__XCHG_CASE(w, , mb_4, dmb ish, nop, , a, l, "memory")
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__XCHG_CASE( , , mb_8, dmb ish, nop, , a, l, "memory")
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#undef __XCHG_CASE
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#define __XCHG_GEN(sfx) \
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static __always_inline unsigned long __xchg##sfx(unsigned long x, \
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volatile void *ptr, \
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int size) \
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{ \
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switch (size) { \
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case 1: \
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return __xchg_case##sfx##_1(x, ptr); \
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case 2: \
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return __xchg_case##sfx##_2(x, ptr); \
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case 4: \
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return __xchg_case##sfx##_4(x, ptr); \
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case 8: \
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return __xchg_case##sfx##_8(x, ptr); \
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default: \
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BUILD_BUG(); \
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} \
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\
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unreachable(); \
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}
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__XCHG_GEN()
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__XCHG_GEN(_acq)
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__XCHG_GEN(_rel)
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__XCHG_GEN(_mb)
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#undef __XCHG_GEN
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#define __xchg_wrapper(sfx, ptr, x) \
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({ \
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__typeof__(*(ptr)) __ret; \
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__ret = (__typeof__(*(ptr))) \
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__xchg##sfx((unsigned long)(x), (ptr), sizeof(*(ptr))); \
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__ret; \
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})
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/* xchg */
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#define xchg_relaxed(...) __xchg_wrapper( , __VA_ARGS__)
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#define xchg_acquire(...) __xchg_wrapper(_acq, __VA_ARGS__)
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#define xchg_release(...) __xchg_wrapper(_rel, __VA_ARGS__)
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#define xchg(...) __xchg_wrapper( _mb, __VA_ARGS__)
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#define __CMPXCHG_GEN(sfx) \
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static __always_inline unsigned long __cmpxchg##sfx(volatile void *ptr, \
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unsigned long old, \
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unsigned long new, \
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int size) \
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{ \
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switch (size) { \
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case 1: \
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return __cmpxchg_case##sfx##_1(ptr, (u8)old, new); \
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case 2: \
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return __cmpxchg_case##sfx##_2(ptr, (u16)old, new); \
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case 4: \
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return __cmpxchg_case##sfx##_4(ptr, old, new); \
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case 8: \
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return __cmpxchg_case##sfx##_8(ptr, old, new); \
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default: \
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BUILD_BUG(); \
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} \
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\
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unreachable(); \
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}
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__CMPXCHG_GEN()
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__CMPXCHG_GEN(_acq)
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__CMPXCHG_GEN(_rel)
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__CMPXCHG_GEN(_mb)
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#undef __CMPXCHG_GEN
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#define __cmpxchg_wrapper(sfx, ptr, o, n) \
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({ \
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__typeof__(*(ptr)) __ret; \
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__ret = (__typeof__(*(ptr))) \
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__cmpxchg##sfx((ptr), (unsigned long)(o), \
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(unsigned long)(n), sizeof(*(ptr))); \
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__ret; \
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})
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/* cmpxchg */
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#define cmpxchg_relaxed(...) __cmpxchg_wrapper( , __VA_ARGS__)
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#define cmpxchg_acquire(...) __cmpxchg_wrapper(_acq, __VA_ARGS__)
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#define cmpxchg_release(...) __cmpxchg_wrapper(_rel, __VA_ARGS__)
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#define cmpxchg(...) __cmpxchg_wrapper( _mb, __VA_ARGS__)
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#define cmpxchg_local cmpxchg_relaxed
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/* cmpxchg64 */
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#define cmpxchg64_relaxed cmpxchg_relaxed
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#define cmpxchg64_acquire cmpxchg_acquire
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#define cmpxchg64_release cmpxchg_release
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#define cmpxchg64 cmpxchg
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#define cmpxchg64_local cmpxchg_local
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/* cmpxchg_double */
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#define system_has_cmpxchg_double() 1
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#define __cmpxchg_double_check(ptr1, ptr2) \
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({ \
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if (sizeof(*(ptr1)) != 8) \
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BUILD_BUG(); \
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VM_BUG_ON((unsigned long *)(ptr2) - (unsigned long *)(ptr1) != 1); \
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})
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#define cmpxchg_double(ptr1, ptr2, o1, o2, n1, n2) \
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({\
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int __ret;\
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__cmpxchg_double_check(ptr1, ptr2); \
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__ret = !__cmpxchg_double_mb((unsigned long)(o1), (unsigned long)(o2), \
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(unsigned long)(n1), (unsigned long)(n2), \
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ptr1); \
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__ret; \
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})
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#define cmpxchg_double_local(ptr1, ptr2, o1, o2, n1, n2) \
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({\
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int __ret;\
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__cmpxchg_double_check(ptr1, ptr2); \
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__ret = !__cmpxchg_double((unsigned long)(o1), (unsigned long)(o2), \
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(unsigned long)(n1), (unsigned long)(n2), \
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ptr1); \
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__ret; \
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})
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#define __CMPWAIT_CASE(w, sz, name) \
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static inline void __cmpwait_case_##name(volatile void *ptr, \
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unsigned long val) \
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{ \
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unsigned long tmp; \
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\
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asm volatile( \
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" sevl\n" \
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" wfe\n" \
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" ldxr" #sz "\t%" #w "[tmp], %[v]\n" \
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" eor %" #w "[tmp], %" #w "[tmp], %" #w "[val]\n" \
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" cbnz %" #w "[tmp], 1f\n" \
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" wfe\n" \
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"1:" \
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: [tmp] "=&r" (tmp), [v] "+Q" (*(unsigned long *)ptr) \
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: [val] "r" (val)); \
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}
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__CMPWAIT_CASE(w, b, 1);
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__CMPWAIT_CASE(w, h, 2);
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__CMPWAIT_CASE(w, , 4);
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__CMPWAIT_CASE( , , 8);
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#undef __CMPWAIT_CASE
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#define __CMPWAIT_GEN(sfx) \
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static __always_inline void __cmpwait##sfx(volatile void *ptr, \
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unsigned long val, \
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int size) \
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{ \
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switch (size) { \
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case 1: \
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return __cmpwait_case##sfx##_1(ptr, (u8)val); \
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case 2: \
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return __cmpwait_case##sfx##_2(ptr, (u16)val); \
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case 4: \
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return __cmpwait_case##sfx##_4(ptr, val); \
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case 8: \
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return __cmpwait_case##sfx##_8(ptr, val); \
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default: \
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BUILD_BUG(); \
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} \
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\
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unreachable(); \
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}
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__CMPWAIT_GEN()
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#undef __CMPWAIT_GEN
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#define __cmpwait_relaxed(ptr, val) \
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__cmpwait((ptr), (unsigned long)(val), sizeof(*(ptr)))
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#endif /* __ASM_CMPXCHG_H */
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