1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013-2015 François Tigeot 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice unmodified, this list of conditions, and the following 13 * disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #ifndef _ASM_ATOMIC_H_ 31 #define _ASM_ATOMIC_H_ 32 33 #include <sys/types.h> 34 #include <machine/atomic.h> 35 #include <linux/compiler.h> 36 37 typedef struct { 38 volatile u_int counter; 39 } atomic_t; 40 41 typedef struct { 42 volatile u_long counter; 43 } atomic64_t; 44 45 #define atomic_add(i, v) atomic_add_return((i), (v)) 46 #define atomic_sub(i, v) atomic_sub_return((i), (v)) 47 #define atomic_inc_return(v) atomic_add_return(1, (v)) 48 #define atomic_add_negative(i, v) (atomic_add_return((i), (v)) < 0) 49 #define atomic_sub_and_test(i, v) (atomic_sub_return((i), (v)) == 0) 50 #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0) 51 #define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0) 52 #define atomic_dec_return(v) atomic_sub_return(1, (v)) 53 54 #define atomic64_add(i, v) atomic_add_return_long((i), (v)) 55 #define atomic64_sub(i, v) atomic_sub_return_long((i), (v)) 56 57 #define atomic_xchg(p, v) atomic_swap_int(&((p)->counter), v) 58 #define atomic64_xchg(p, v) atomic_swap_long(&((p)->counter), v) 59 60 #define atomic_cmpset(p, o, n) atomic_cmpset_32(&((p)->counter), o, n) 61 62 static inline int 63 atomic_add_return(int i, atomic_t *v) 64 { 65 return i + atomic_fetchadd_int(&v->counter, i); 66 } 67 68 static inline int64_t 69 atomic_add_return_long(int64_t i, atomic64_t *v) 70 { 71 return i + atomic_fetchadd_long(&v->counter, i); 72 } 73 74 static inline int 75 atomic_sub_return(int i, atomic_t *v) 76 { 77 return atomic_fetchadd_int(&v->counter, -i) - i; 78 } 79 80 static inline int64_t 81 atomic_sub_return_long(int64_t i, atomic64_t *v) 82 { 83 return atomic_fetchadd_long(&v->counter, -i) - i; 84 } 85 86 static inline void 87 atomic_set(atomic_t *v, int i) 88 { 89 atomic_store_rel_int(&v->counter, i); 90 } 91 92 static inline void 93 atomic64_set(atomic64_t *v, long i) 94 { 95 atomic_store_rel_long(&v->counter, i); 96 } 97 98 static inline int 99 atomic_read(atomic_t *v) 100 { 101 return atomic_load_acq_int(&v->counter); 102 } 103 104 static inline int64_t 105 atomic64_read(atomic64_t *v) 106 { 107 return atomic_load_acq_long(&v->counter); 108 } 109 110 static inline int 111 atomic_inc(atomic_t *v) 112 { 113 return atomic_fetchadd_int(&v->counter, 1) + 1; 114 } 115 116 static inline int 117 atomic_dec(atomic_t *v) 118 { 119 return atomic_fetchadd_int(&v->counter, -1) - 1; 120 } 121 122 static inline int atomic_cmpxchg(atomic_t *v, int old, int new) 123 { 124 return atomic_cmpxchg_int(&v->counter, old, new); 125 } 126 127 static inline int atomic_add_unless(atomic_t *v, int add, int unless) 128 { 129 int c, old; 130 c = atomic_read(v); 131 for (;;) { 132 if (unlikely(c == unless)) 133 break; 134 old = atomic_cmpxchg_int(&v->counter, c, c + add); 135 if (likely(old == c)) 136 break; 137 c = old; 138 } 139 return c != unless; 140 } 141 142 #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) 143 144 /* atomic_clear_mask: atomically clears a variable from the bit set in mask */ 145 #define atomic_clear_mask(mask, addr) \ 146 /* atomic *addr &= ~mask; */ \ 147 __asm __volatile("lock andl %0, %1" \ 148 : \ 149 : "r" (~mask), "m" (*addr) \ 150 : "memory"); 151 152 /* atomic_set_mask: atomically set bits in a variable */ 153 #define atomic_set_mask(mask, addr) \ 154 /* atomic *addr |= mask; */ \ 155 __asm __volatile("lock orl %0, %1" \ 156 : \ 157 : "r" (mask), "m" (*addr) \ 158 : "memory"); 159 160 161 #define smp_mb__before_atomic() cpu_ccfence() 162 #define smp_mb__after_atomic() cpu_ccfence() 163 164 #endif /* _ASM_ATOMIC_H_ */ 165