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 * $FreeBSD$ 27 */ 28 #ifndef _LINUXKPI_ASM_ATOMIC64_H_ 29 #define _LINUXKPI_ASM_ATOMIC64_H_ 30 31 #include <linux/compiler.h> 32 #include <sys/types.h> 33 #include <machine/atomic.h> 34 35 typedef struct { 36 volatile int64_t counter; 37 } atomic64_t; 38 #define ATOMIC64_INIT(x) { .counter = (x) } 39 40 /*------------------------------------------------------------------------* 41 * 64-bit atomic operations 42 *------------------------------------------------------------------------*/ 43 44 #define atomic64_add(i, v) atomic64_add_return((i), (v)) 45 #define atomic64_sub(i, v) atomic64_sub_return((i), (v)) 46 #define atomic64_inc_return(v) atomic64_add_return(1, (v)) 47 #define atomic64_add_negative(i, v) (atomic64_add_return((i), (v)) < 0) 48 #define atomic64_add_and_test(i, v) (atomic64_add_return((i), (v)) == 0) 49 #define atomic64_sub_and_test(i, v) (atomic64_sub_return((i), (v)) == 0) 50 #define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0) 51 #define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0) 52 #define atomic64_dec_return(v) atomic64_sub_return(1, (v)) 53 #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) 54 55 static inline int64_t 56 atomic64_fetch_add(int64_t i, atomic64_t *v) 57 { 58 return (atomic_fetchadd_64(&v->counter, i)); 59 } 60 61 static inline int64_t 62 atomic64_add_return(int64_t i, atomic64_t *v) 63 { 64 return i + atomic_fetchadd_64(&v->counter, i); 65 } 66 67 static inline int64_t 68 atomic64_sub_return(int64_t i, atomic64_t *v) 69 { 70 return atomic_fetchadd_64(&v->counter, -i) - i; 71 } 72 73 static inline void 74 atomic64_set(atomic64_t *v, int64_t i) 75 { 76 atomic_store_rel_64(&v->counter, i); 77 } 78 79 static inline int64_t 80 atomic64_read(atomic64_t *v) 81 { 82 return READ_ONCE(v->counter); 83 } 84 85 static inline int64_t 86 atomic64_inc(atomic64_t *v) 87 { 88 return atomic_fetchadd_64(&v->counter, 1) + 1; 89 } 90 91 static inline int64_t 92 atomic64_dec(atomic64_t *v) 93 { 94 return atomic_fetchadd_64(&v->counter, -1) - 1; 95 } 96 97 static inline int64_t 98 atomic64_add_unless(atomic64_t *v, int64_t a, int64_t u) 99 { 100 int64_t c = atomic64_read(v); 101 102 for (;;) { 103 if (unlikely(c == u)) 104 break; 105 if (likely(atomic_fcmpset_64(&v->counter, &c, c + a))) 106 break; 107 } 108 return (c != u); 109 } 110 111 static inline int64_t 112 atomic64_fetch_add_unless(atomic64_t *v, int64_t a, int64_t u) 113 { 114 int64_t c = atomic64_read(v); 115 116 for (;;) { 117 if (unlikely(c == u)) 118 break; 119 if (likely(atomic_fcmpset_64(&v->counter, &c, c + a))) 120 break; 121 } 122 return (c); 123 } 124 125 static inline int64_t 126 atomic64_xchg(atomic64_t *v, int64_t i) 127 { 128 #if !(defined(__powerpc__) && !defined(__powerpc64__)) 129 return (atomic_swap_64(&v->counter, i)); 130 #else 131 int64_t ret = atomic64_read(v); 132 133 while (!atomic_fcmpset_64(&v->counter, &ret, i)) 134 ; 135 return (ret); 136 #endif 137 } 138 139 static inline int64_t 140 atomic64_cmpxchg(atomic64_t *v, int64_t old, int64_t new) 141 { 142 int64_t ret = old; 143 144 for (;;) { 145 if (atomic_fcmpset_64(&v->counter, &ret, new)) 146 break; 147 if (ret != old) 148 break; 149 } 150 return (ret); 151 } 152 153 #endif /* _LINUXKPI_ASM_ATOMIC64_H_ */ 154