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 #ifndef _LINUXKPI_ASM_ATOMIC_LONG_H_
30 #define _LINUXKPI_ASM_ATOMIC_LONG_H_
31
32 #include <linux/compiler.h>
33 #include <sys/types.h>
34 #include <machine/atomic.h>
35 #define ATOMIC_LONG_INIT(x) { .counter = (x) }
36
37 typedef struct {
38 volatile long counter;
39 } atomic_long_t;
40
41 #define atomic_long_add(i, v) atomic_long_add_return((i), (v))
42 #define atomic_long_sub(i, v) atomic_long_sub_return((i), (v))
43 #define atomic_long_inc_return(v) atomic_long_add_return(1, (v))
44 #define atomic_long_inc_not_zero(v) atomic_long_add_unless((v), 1, 0)
45
46 static inline long
atomic_long_add_return(long i,atomic_long_t * v)47 atomic_long_add_return(long i, atomic_long_t *v)
48 {
49 return i + atomic_fetchadd_long(&v->counter, i);
50 }
51
52 static inline long
atomic_long_sub_return(long i,atomic_long_t * v)53 atomic_long_sub_return(long i, atomic_long_t *v)
54 {
55 return atomic_fetchadd_long(&v->counter, -i) - i;
56 }
57
58 static inline void
atomic_long_set(atomic_long_t * v,long i)59 atomic_long_set(atomic_long_t *v, long i)
60 {
61 WRITE_ONCE(v->counter, i);
62 }
63
64 static inline long
atomic_long_read(atomic_long_t * v)65 atomic_long_read(atomic_long_t *v)
66 {
67 return READ_ONCE(v->counter);
68 }
69
70 static inline long
atomic_long_inc(atomic_long_t * v)71 atomic_long_inc(atomic_long_t *v)
72 {
73 return atomic_fetchadd_long(&v->counter, 1) + 1;
74 }
75
76 static inline long
atomic_long_dec(atomic_long_t * v)77 atomic_long_dec(atomic_long_t *v)
78 {
79 return atomic_fetchadd_long(&v->counter, -1) - 1;
80 }
81
82 static inline long
atomic_long_xchg(atomic_long_t * v,long val)83 atomic_long_xchg(atomic_long_t *v, long val)
84 {
85 return atomic_swap_long(&v->counter, val);
86 }
87
88 static inline long
atomic_long_cmpxchg(atomic_long_t * v,long old,long new)89 atomic_long_cmpxchg(atomic_long_t *v, long old, long new)
90 {
91 long ret = old;
92
93 for (;;) {
94 if (atomic_fcmpset_long(&v->counter, &ret, new))
95 break;
96 if (ret != old)
97 break;
98 }
99 return (ret);
100 }
101
102 static inline int
atomic_long_add_unless(atomic_long_t * v,long a,long u)103 atomic_long_add_unless(atomic_long_t *v, long a, long u)
104 {
105 long c = atomic_long_read(v);
106
107 for (;;) {
108 if (unlikely(c == u))
109 break;
110 if (likely(atomic_fcmpset_long(&v->counter, &c, c + a)))
111 break;
112 }
113 return (c != u);
114 }
115
116 static inline long
atomic_long_fetch_add_unless(atomic_long_t * v,long a,long u)117 atomic_long_fetch_add_unless(atomic_long_t *v, long a, long u)
118 {
119 long c = atomic_long_read(v);
120
121 for (;;) {
122 if (unlikely(c == u))
123 break;
124 if (likely(atomic_fcmpset_long(&v->counter, &c, c + a)))
125 break;
126 }
127 return (c);
128 }
129
130 static inline long
atomic_long_dec_and_test(atomic_long_t * v)131 atomic_long_dec_and_test(atomic_long_t *v)
132 {
133 long i = atomic_long_add(-1, v);
134 return i == 0 ;
135 }
136
137 #endif /* _LINUXKPI_ASM_ATOMIC_LONG_H_ */
138