atomic64.h revision 337898
1/*- 2 * Copyright (c) 2016-2017 Mellanox Technologies, Ltd. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 * $FreeBSD: stable/11/sys/compat/linuxkpi/common/include/asm/atomic64.h 337898 2018-08-16 08:12:36Z hselasky $ 27 */ 28#ifndef _ASM_ATOMIC64_H_ 29#define _ASM_ATOMIC64_H_ 30 31#include <linux/compiler.h> 32#include <sys/types.h> 33#include <machine/atomic.h> 34 35typedef struct { 36 volatile int64_t counter; 37} atomic64_t; 38 39#define ATOMIC64_INIT(x) { .counter = (x) } 40 41/*------------------------------------------------------------------------* 42 * 64-bit atomic operations 43 *------------------------------------------------------------------------*/ 44 45#define atomic64_add(i, v) atomic64_add_return((i), (v)) 46#define atomic64_sub(i, v) atomic64_sub_return((i), (v)) 47#define atomic64_inc_return(v) atomic64_add_return(1, (v)) 48#define atomic64_add_negative(i, v) (atomic64_add_return((i), (v)) < 0) 49#define atomic64_add_and_test(i, v) (atomic64_add_return((i), (v)) == 0) 50#define atomic64_sub_and_test(i, v) (atomic64_sub_return((i), (v)) == 0) 51#define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0) 52#define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0) 53#define atomic64_dec_return(v) atomic64_sub_return(1, (v)) 54#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) 55 56static inline int64_t 57atomic64_add_return(int64_t i, atomic64_t *v) 58{ 59 return i + atomic_fetchadd_64(&v->counter, i); 60} 61 62static inline int64_t 63atomic64_sub_return(int64_t i, atomic64_t *v) 64{ 65 return atomic_fetchadd_64(&v->counter, -i) - i; 66} 67 68static inline void 69atomic64_set(atomic64_t *v, int64_t i) 70{ 71 atomic_store_rel_64(&v->counter, i); 72} 73 74static inline int64_t 75atomic64_read(atomic64_t *v) 76{ 77 return READ_ONCE(v->counter); 78} 79 80static inline int64_t 81atomic64_inc(atomic64_t *v) 82{ 83 return atomic_fetchadd_64(&v->counter, 1) + 1; 84} 85 86static inline int64_t 87atomic64_dec(atomic64_t *v) 88{ 89 return atomic_fetchadd_64(&v->counter, -1) - 1; 90} 91 92static inline int64_t 93atomic64_add_unless(atomic64_t *v, int64_t a, int64_t u) 94{ 95 int64_t c = atomic64_read(v); 96 97 for (;;) { 98 if (unlikely(c == u)) 99 break; 100 if (likely(atomic_fcmpset_64(&v->counter, &c, c + a))) 101 break; 102 } 103 return (c != u); 104} 105 106static inline int64_t 107atomic64_xchg(atomic64_t *v, int64_t i) 108{ 109#if defined(__i386__) || defined(__amd64__) || \ 110 defined(__arm__) || defined(__aarch64__) || \ 111 defined(__powerpc64__) 112 return (atomic_swap_64(&v->counter, i)); 113#else 114 int64_t ret = atomic64_read(v); 115 116 while (!atomic_fcmpset_64(&v->counter, &ret, i)) 117 ; 118 return (ret); 119#endif 120} 121 122static inline int64_t 123atomic64_cmpxchg(atomic64_t *v, int64_t old, int64_t new) 124{ 125 int64_t ret = old; 126 127 for (;;) { 128 if (atomic_fcmpset_64(&v->counter, &ret, new)) 129 break; 130 if (ret != old) 131 break; 132 } 133 return (ret); 134} 135 136#endif /* _ASM_ATOMIC64_H_ */ 137