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