1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright IBM Corp. 1999, 2016
4 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>,
9 #ifndef __ARCH_S390_ATOMIC__
10 #define __ARCH_S390_ATOMIC__
12 #include <linux/compiler.h>
13 #include <linux/types.h>
14 #include <asm/atomic_ops.h>
15 #include <asm/barrier.h>
16 #include <asm/cmpxchg.h>
18 #define ATOMIC_INIT(i) { (i) }
20 static inline int atomic_read(const atomic_t *v)
26 : "=d" (c) : "Q" (v->counter));
30 static inline void atomic_set(atomic_t *v, int i)
34 : "=Q" (v->counter) : "d" (i));
37 static inline int atomic_add_return(int i, atomic_t *v)
39 return __atomic_add_barrier(i, &v->counter) + i;
42 static inline int atomic_fetch_add(int i, atomic_t *v)
44 return __atomic_add_barrier(i, &v->counter);
47 static inline void atomic_add(int i, atomic_t *v)
49 #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
50 if (__builtin_constant_p(i) && (i > -129) && (i < 128)) {
51 __atomic_add_const(i, &v->counter);
55 __atomic_add(i, &v->counter);
58 #define atomic_add_negative(_i, _v) (atomic_add_return(_i, _v) < 0)
59 #define atomic_inc(_v) atomic_add(1, _v)
60 #define atomic_inc_return(_v) atomic_add_return(1, _v)
61 #define atomic_inc_and_test(_v) (atomic_add_return(1, _v) == 0)
62 #define atomic_sub(_i, _v) atomic_add(-(int)(_i), _v)
63 #define atomic_sub_return(_i, _v) atomic_add_return(-(int)(_i), _v)
64 #define atomic_fetch_sub(_i, _v) atomic_fetch_add(-(int)(_i), _v)
65 #define atomic_sub_and_test(_i, _v) (atomic_sub_return(_i, _v) == 0)
66 #define atomic_dec(_v) atomic_sub(1, _v)
67 #define atomic_dec_return(_v) atomic_sub_return(1, _v)
68 #define atomic_dec_and_test(_v) (atomic_sub_return(1, _v) == 0)
70 #define ATOMIC_OPS(op) \
71 static inline void atomic_##op(int i, atomic_t *v) \
73 __atomic_##op(i, &v->counter); \
75 static inline int atomic_fetch_##op(int i, atomic_t *v) \
77 return __atomic_##op##_barrier(i, &v->counter); \
86 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
88 static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
90 return __atomic_cmpxchg(&v->counter, old, new);
93 static inline int __atomic_add_unless(atomic_t *v, int a, int u)
100 old = atomic_cmpxchg(v, c, c + a);
101 if (likely(old == c))
108 #define ATOMIC64_INIT(i) { (i) }
110 static inline long atomic64_read(const atomic64_t *v)
116 : "=d" (c) : "Q" (v->counter));
120 static inline void atomic64_set(atomic64_t *v, long i)
124 : "=Q" (v->counter) : "d" (i));
127 static inline long atomic64_add_return(long i, atomic64_t *v)
129 return __atomic64_add_barrier(i, &v->counter) + i;
132 static inline long atomic64_fetch_add(long i, atomic64_t *v)
134 return __atomic64_add_barrier(i, &v->counter);
137 static inline void atomic64_add(long i, atomic64_t *v)
139 #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
140 if (__builtin_constant_p(i) && (i > -129) && (i < 128)) {
141 __atomic64_add_const(i, &v->counter);
145 __atomic64_add(i, &v->counter);
148 #define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
150 static inline long atomic64_cmpxchg(atomic64_t *v, long old, long new)
152 return __atomic64_cmpxchg(&v->counter, old, new);
155 #define ATOMIC64_OPS(op) \
156 static inline void atomic64_##op(long i, atomic64_t *v) \
158 __atomic64_##op(i, &v->counter); \
160 static inline long atomic64_fetch_##op(long i, atomic64_t *v) \
162 return __atomic64_##op##_barrier(i, &v->counter); \
171 static inline int atomic64_add_unless(atomic64_t *v, long i, long u)
175 c = atomic64_read(v);
177 if (unlikely(c == u))
179 old = atomic64_cmpxchg(v, c, c + i);
180 if (likely(old == c))
187 static inline long atomic64_dec_if_positive(atomic64_t *v)
191 c = atomic64_read(v);
194 if (unlikely(dec < 0))
196 old = atomic64_cmpxchg((v), c, dec);
197 if (likely(old == c))
204 #define atomic64_add_negative(_i, _v) (atomic64_add_return(_i, _v) < 0)
205 #define atomic64_inc(_v) atomic64_add(1, _v)
206 #define atomic64_inc_return(_v) atomic64_add_return(1, _v)
207 #define atomic64_inc_and_test(_v) (atomic64_add_return(1, _v) == 0)
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)
211 #define atomic64_sub_and_test(_i, _v) (atomic64_sub_return(_i, _v) == 0)
212 #define atomic64_dec(_v) atomic64_sub(1, _v)
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)
217 #endif /* __ARCH_S390_ATOMIC__ */