1 /*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013-2017 Mellanox Technologies, Ltd.
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 * $FreeBSD$
30 */
31 #ifndef _LINUXKPI_ASM_ATOMIC_LONG_H_
32 #define _LINUXKPI_ASM_ATOMIC_LONG_H_
33
34 #include <linux/compiler.h>
35 #include <sys/types.h>
36 #include <machine/atomic.h>
37 #define ATOMIC_LONG_INIT(x) { .counter = (x) }
38
39 typedef struct {
40 volatile long counter;
41 } atomic_long_t;
42
43 #define atomic_long_add(i, v) atomic_long_add_return((i), (v))
44 #define atomic_long_sub(i, v) atomic_long_add_return(-(i), (v))
45 #define atomic_long_inc_return(v) atomic_long_add_return(1, (v))
46 #define atomic_long_inc_not_zero(v) atomic_long_add_unless((v), 1, 0)
47
48 static inline long
atomic_long_add_return(long i,atomic_long_t * v)49 atomic_long_add_return(long i, atomic_long_t *v)
50 {
51 return i + atomic_fetchadd_long(&v->counter, i);
52 }
53
54 static inline void
atomic_long_set(atomic_long_t * v,long i)55 atomic_long_set(atomic_long_t *v, long i)
56 {
57 WRITE_ONCE(v->counter, i);
58 }
59
60 static inline long
atomic_long_read(atomic_long_t * v)61 atomic_long_read(atomic_long_t *v)
62 {
63 return READ_ONCE(v->counter);
64 }
65
66 static inline long
atomic_long_inc(atomic_long_t * v)67 atomic_long_inc(atomic_long_t *v)
68 {
69 return atomic_fetchadd_long(&v->counter, 1) + 1;
70 }
71
72 static inline long
atomic_long_dec(atomic_long_t * v)73 atomic_long_dec(atomic_long_t *v)
74 {
75 return atomic_fetchadd_long(&v->counter, -1) - 1;
76 }
77
78 static inline long
atomic_long_xchg(atomic_long_t * v,long val)79 atomic_long_xchg(atomic_long_t *v, long val)
80 {
81 return atomic_swap_long(&v->counter, val);
82 }
83
84 static inline long
atomic_long_cmpxchg(atomic_long_t * v,long old,long new)85 atomic_long_cmpxchg(atomic_long_t *v, long old, long new)
86 {
87 long ret = old;
88
89 for (;;) {
90 if (atomic_fcmpset_long(&v->counter, &ret, new))
91 break;
92 if (ret != old)
93 break;
94 }
95 return (ret);
96 }
97
98 static inline int
atomic_long_add_unless(atomic_long_t * v,long a,long u)99 atomic_long_add_unless(atomic_long_t *v, long a, long u)
100 {
101 long c = atomic_long_read(v);
102
103 for (;;) {
104 if (unlikely(c == u))
105 break;
106 if (likely(atomic_fcmpset_long(&v->counter, &c, c + a)))
107 break;
108 }
109 return (c != u);
110 }
111
112 static inline long
atomic_long_fetch_add_unless(atomic_long_t * v,long a,long u)113 atomic_long_fetch_add_unless(atomic_long_t *v, long a, long u)
114 {
115 long c = atomic_long_read(v);
116
117 for (;;) {
118 if (unlikely(c == u))
119 break;
120 if (likely(atomic_fcmpset_long(&v->counter, &c, c + a)))
121 break;
122 }
123 return (c);
124 }
125
126 static inline long
atomic_long_dec_and_test(atomic_long_t * v)127 atomic_long_dec_and_test(atomic_long_t *v)
128 {
129 long i = atomic_long_add(-1, v);
130 return i == 0 ;
131 }
132
133 #endif /* _LINUXKPI_ASM_ATOMIC_LONG_H_ */
134