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Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 | 2 | /* |
126b30c3 | 3 | * Copyright IBM Corp. 1999, 2016 |
12751058 HC |
4 | * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>, |
5 | * Denis Joseph Barrow, | |
126b30c3 | 6 | * Arnd Bergmann, |
1da177e4 LT |
7 | */ |
8 | ||
a53c8fab HC |
9 | #ifndef __ARCH_S390_ATOMIC__ |
10 | #define __ARCH_S390_ATOMIC__ | |
11 | ||
12751058 HC |
12 | #include <linux/compiler.h> |
13 | #include <linux/types.h> | |
126b30c3 | 14 | #include <asm/atomic_ops.h> |
0ccc8b7a | 15 | #include <asm/barrier.h> |
a0616cde | 16 | #include <asm/cmpxchg.h> |
1da177e4 | 17 | |
1da177e4 LT |
18 | #define ATOMIC_INIT(i) { (i) } |
19 | ||
c51b9621 HC |
20 | static inline int atomic_read(const atomic_t *v) |
21 | { | |
7657e41a HC |
22 | int c; |
23 | ||
24 | asm volatile( | |
25 | " l %0,%1\n" | |
26 | : "=d" (c) : "Q" (v->counter)); | |
27 | return c; | |
c51b9621 HC |
28 | } |
29 | ||
30 | static inline void atomic_set(atomic_t *v, int i) | |
31 | { | |
7657e41a HC |
32 | asm volatile( |
33 | " st %1,%0\n" | |
34 | : "=Q" (v->counter) : "d" (i)); | |
c51b9621 | 35 | } |
1da177e4 | 36 | |
bfe3349b | 37 | static inline int atomic_add_return(int i, atomic_t *v) |
1da177e4 | 38 | { |
126b30c3 | 39 | return __atomic_add_barrier(i, &v->counter) + i; |
1da177e4 | 40 | } |
75287430 | 41 | |
56fefbbc PZ |
42 | static inline int atomic_fetch_add(int i, atomic_t *v) |
43 | { | |
126b30c3 | 44 | return __atomic_add_barrier(i, &v->counter); |
56fefbbc PZ |
45 | } |
46 | ||
5692e4d1 HC |
47 | static inline void atomic_add(int i, atomic_t *v) |
48 | { | |
49 | #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES | |
50 | if (__builtin_constant_p(i) && (i > -129) && (i < 128)) { | |
126b30c3 | 51 | __atomic_add_const(i, &v->counter); |
0ccc8b7a | 52 | return; |
5692e4d1 | 53 | } |
5692e4d1 | 54 | #endif |
126b30c3 | 55 | __atomic_add(i, &v->counter); |
5692e4d1 HC |
56 | } |
57 | ||
973bd993 | 58 | #define atomic_add_negative(_i, _v) (atomic_add_return(_i, _v) < 0) |
5692e4d1 | 59 | #define atomic_inc(_v) atomic_add(1, _v) |
973bd993 MS |
60 | #define atomic_inc_return(_v) atomic_add_return(1, _v) |
61 | #define atomic_inc_and_test(_v) (atomic_add_return(1, _v) == 0) | |
5692e4d1 | 62 | #define atomic_sub(_i, _v) atomic_add(-(int)(_i), _v) |
86d51bc3 | 63 | #define atomic_sub_return(_i, _v) atomic_add_return(-(int)(_i), _v) |
56fefbbc | 64 | #define atomic_fetch_sub(_i, _v) atomic_fetch_add(-(int)(_i), _v) |
973bd993 | 65 | #define atomic_sub_and_test(_i, _v) (atomic_sub_return(_i, _v) == 0) |
5692e4d1 | 66 | #define atomic_dec(_v) atomic_sub(1, _v) |
973bd993 MS |
67 | #define atomic_dec_return(_v) atomic_sub_return(1, _v) |
68 | #define atomic_dec_and_test(_v) (atomic_sub_return(1, _v) == 0) | |
1da177e4 | 69 | |
126b30c3 | 70 | #define ATOMIC_OPS(op) \ |
ae8c35c8 PZ |
71 | static inline void atomic_##op(int i, atomic_t *v) \ |
72 | { \ | |
126b30c3 | 73 | __atomic_##op(i, &v->counter); \ |
56fefbbc PZ |
74 | } \ |
75 | static inline int atomic_fetch_##op(int i, atomic_t *v) \ | |
76 | { \ | |
126b30c3 | 77 | return __atomic_##op##_barrier(i, &v->counter); \ |
ae8c35c8 PZ |
78 | } |
79 | ||
126b30c3 MS |
80 | ATOMIC_OPS(and) |
81 | ATOMIC_OPS(or) | |
82 | ATOMIC_OPS(xor) | |
ae8c35c8 | 83 | |
56fefbbc | 84 | #undef ATOMIC_OPS |
ae8c35c8 | 85 | |
ffbf670f IM |
86 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) |
87 | ||
bfe3349b | 88 | static inline int atomic_cmpxchg(atomic_t *v, int old, int new) |
973bd993 | 89 | { |
126b30c3 | 90 | return __atomic_cmpxchg(&v->counter, old, new); |
973bd993 MS |
91 | } |
92 | ||
f24219b4 | 93 | static inline int __atomic_add_unless(atomic_t *v, int a, int u) |
973bd993 MS |
94 | { |
95 | int c, old; | |
973bd993 | 96 | c = atomic_read(v); |
0b2fcfdb NP |
97 | for (;;) { |
98 | if (unlikely(c == u)) | |
99 | break; | |
100 | old = atomic_cmpxchg(v, c, c + a); | |
101 | if (likely(old == c)) | |
102 | break; | |
973bd993 | 103 | c = old; |
0b2fcfdb | 104 | } |
f24219b4 | 105 | return c; |
973bd993 MS |
106 | } |
107 | ||
1da177e4 LT |
108 | #define ATOMIC64_INIT(i) { (i) } |
109 | ||
126b30c3 | 110 | static inline long atomic64_read(const atomic64_t *v) |
c51b9621 | 111 | { |
126b30c3 | 112 | long c; |
7657e41a HC |
113 | |
114 | asm volatile( | |
115 | " lg %0,%1\n" | |
116 | : "=d" (c) : "Q" (v->counter)); | |
117 | return c; | |
c51b9621 HC |
118 | } |
119 | ||
126b30c3 | 120 | static inline void atomic64_set(atomic64_t *v, long i) |
c51b9621 | 121 | { |
7657e41a HC |
122 | asm volatile( |
123 | " stg %1,%0\n" | |
124 | : "=Q" (v->counter) : "d" (i)); | |
c51b9621 | 125 | } |
1da177e4 | 126 | |
126b30c3 | 127 | static inline long atomic64_add_return(long i, atomic64_t *v) |
1da177e4 | 128 | { |
126b30c3 | 129 | return __atomic64_add_barrier(i, &v->counter) + i; |
0ccc8b7a HC |
130 | } |
131 | ||
126b30c3 | 132 | static inline long atomic64_fetch_add(long i, atomic64_t *v) |
56fefbbc | 133 | { |
126b30c3 | 134 | return __atomic64_add_barrier(i, &v->counter); |
56fefbbc PZ |
135 | } |
136 | ||
126b30c3 | 137 | static inline void atomic64_add(long i, atomic64_t *v) |
0ccc8b7a HC |
138 | { |
139 | #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES | |
140 | if (__builtin_constant_p(i) && (i > -129) && (i < 128)) { | |
126b30c3 | 141 | __atomic64_add_const(i, &v->counter); |
0ccc8b7a HC |
142 | return; |
143 | } | |
144 | #endif | |
126b30c3 | 145 | __atomic64_add(i, &v->counter); |
1da177e4 | 146 | } |
973bd993 | 147 | |
3a5f10e3 MD |
148 | #define atomic64_xchg(v, new) (xchg(&((v)->counter), new)) |
149 | ||
126b30c3 | 150 | static inline long atomic64_cmpxchg(atomic64_t *v, long old, long new) |
973bd993 | 151 | { |
126b30c3 | 152 | return __atomic64_cmpxchg(&v->counter, old, new); |
973bd993 | 153 | } |
1da177e4 | 154 | |
126b30c3 | 155 | #define ATOMIC64_OPS(op) \ |
ae8c35c8 PZ |
156 | static inline void atomic64_##op(long i, atomic64_t *v) \ |
157 | { \ | |
126b30c3 | 158 | __atomic64_##op(i, &v->counter); \ |
56fefbbc PZ |
159 | } \ |
160 | static inline long atomic64_fetch_##op(long i, atomic64_t *v) \ | |
161 | { \ | |
126b30c3 | 162 | return __atomic64_##op##_barrier(i, &v->counter); \ |
ae8c35c8 PZ |
163 | } |
164 | ||
126b30c3 MS |
165 | ATOMIC64_OPS(and) |
166 | ATOMIC64_OPS(or) | |
167 | ATOMIC64_OPS(xor) | |
ae8c35c8 | 168 | |
56fefbbc | 169 | #undef ATOMIC64_OPS |
12751058 | 170 | |
126b30c3 | 171 | static inline int atomic64_add_unless(atomic64_t *v, long i, long u) |
1da177e4 | 172 | { |
126b30c3 | 173 | long c, old; |
2ddb3ec4 | 174 | |
973bd993 | 175 | c = atomic64_read(v); |
0b2fcfdb NP |
176 | for (;;) { |
177 | if (unlikely(c == u)) | |
178 | break; | |
9a70a428 | 179 | old = atomic64_cmpxchg(v, c, c + i); |
0b2fcfdb NP |
180 | if (likely(old == c)) |
181 | break; | |
973bd993 | 182 | c = old; |
0b2fcfdb | 183 | } |
973bd993 | 184 | return c != u; |
1da177e4 LT |
185 | } |
186 | ||
126b30c3 | 187 | static inline long atomic64_dec_if_positive(atomic64_t *v) |
2ddb3ec4 | 188 | { |
126b30c3 | 189 | long c, old, dec; |
2ddb3ec4 HC |
190 | |
191 | c = atomic64_read(v); | |
192 | for (;;) { | |
193 | dec = c - 1; | |
194 | if (unlikely(dec < 0)) | |
195 | break; | |
196 | old = atomic64_cmpxchg((v), c, dec); | |
197 | if (likely(old == c)) | |
198 | break; | |
199 | c = old; | |
200 | } | |
201 | return dec; | |
202 | } | |
203 | ||
12751058 | 204 | #define atomic64_add_negative(_i, _v) (atomic64_add_return(_i, _v) < 0) |
5692e4d1 | 205 | #define atomic64_inc(_v) atomic64_add(1, _v) |
12751058 HC |
206 | #define atomic64_inc_return(_v) atomic64_add_return(1, _v) |
207 | #define atomic64_inc_and_test(_v) (atomic64_add_return(1, _v) == 0) | |
126b30c3 MS |
208 | #define atomic64_sub_return(_i, _v) atomic64_add_return(-(long)(_i), _v) |
209 | #define atomic64_fetch_sub(_i, _v) atomic64_fetch_add(-(long)(_i), _v) | |
210 | #define atomic64_sub(_i, _v) atomic64_add(-(long)(_i), _v) | |
12751058 | 211 | #define atomic64_sub_and_test(_i, _v) (atomic64_sub_return(_i, _v) == 0) |
5692e4d1 | 212 | #define atomic64_dec(_v) atomic64_sub(1, _v) |
12751058 HC |
213 | #define atomic64_dec_return(_v) atomic64_sub_return(1, _v) |
214 | #define atomic64_dec_and_test(_v) (atomic64_sub_return(1, _v) == 0) | |
215 | #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) | |
8426e1f6 | 216 | |
1da177e4 | 217 | #endif /* __ARCH_S390_ATOMIC__ */ |