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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - arch/s390/include/asm/atomic.h
1 #ifndef __ARCH_S390_ATOMIC__
2 #define __ARCH_S390_ATOMIC__
5 * Copyright 1999,2009 IBM Corp.
6 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>,
8 * Arnd Bergmann <arndb@de.ibm.com>,
10 * Atomic operations that C can't guarantee us.
11 * Useful for resource counting etc.
12 * s390 uses 'Compare And Swap' for atomicity in SMP environment.
16 #include <linux/compiler.h>
17 #include <linux/types.h>
18 #include <asm/system.h>
20 #define ATOMIC_INIT(i) { (i) }
22 #define __CS_LOOP(ptr, op_val, op_string) ({ \
23 int old_val, new_val; \
27 op_string " %1,%3\n" \
30 : "=&d" (old_val), "=&d" (new_val), \
31 "=Q" (((atomic_t *)(ptr))->counter) \
32 : "d" (op_val), "Q" (((atomic_t *)(ptr))->counter) \
37 static inline int atomic_read(const atomic_t
*v
)
43 : "=d" (c
) : "Q" (v
->counter
));
47 static inline void atomic_set(atomic_t
*v
, int i
)
51 : "=Q" (v
->counter
) : "d" (i
));
54 static inline int atomic_add_return(int i
, atomic_t
*v
)
56 return __CS_LOOP(v
, i
, "ar");
58 #define atomic_add(_i, _v) atomic_add_return(_i, _v)
59 #define atomic_add_negative(_i, _v) (atomic_add_return(_i, _v) < 0)
60 #define atomic_inc(_v) atomic_add_return(1, _v)
61 #define atomic_inc_return(_v) atomic_add_return(1, _v)
62 #define atomic_inc_and_test(_v) (atomic_add_return(1, _v) == 0)
64 static inline int atomic_sub_return(int i
, atomic_t
*v
)
66 return __CS_LOOP(v
, i
, "sr");
68 #define atomic_sub(_i, _v) atomic_sub_return(_i, _v)
69 #define atomic_sub_and_test(_i, _v) (atomic_sub_return(_i, _v) == 0)
70 #define atomic_dec(_v) atomic_sub_return(1, _v)
71 #define atomic_dec_return(_v) atomic_sub_return(1, _v)
72 #define atomic_dec_and_test(_v) (atomic_sub_return(1, _v) == 0)
74 static inline void atomic_clear_mask(unsigned long mask
, atomic_t
*v
)
76 __CS_LOOP(v
, ~mask
, "nr");
79 static inline void atomic_set_mask(unsigned long mask
, atomic_t
*v
)
81 __CS_LOOP(v
, mask
, "or");
84 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
86 static inline int atomic_cmpxchg(atomic_t
*v
, int old
, int new)
90 : "+d" (old
), "=Q" (v
->counter
)
91 : "d" (new), "Q" (v
->counter
)
96 static inline int atomic_add_unless(atomic_t
*v
, int a
, int u
)
101 if (unlikely(c
== u
))
103 old
= atomic_cmpxchg(v
, c
, c
+ a
);
104 if (likely(old
== c
))
111 #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
115 #define ATOMIC64_INIT(i) { (i) }
119 #define __CSG_LOOP(ptr, op_val, op_string) ({ \
120 long long old_val, new_val; \
124 op_string " %1,%3\n" \
127 : "=&d" (old_val), "=&d" (new_val), \
128 "=Q" (((atomic_t *)(ptr))->counter) \
129 : "d" (op_val), "Q" (((atomic_t *)(ptr))->counter) \
134 static inline long long atomic64_read(const atomic64_t
*v
)
140 : "=d" (c
) : "Q" (v
->counter
));
144 static inline void atomic64_set(atomic64_t
*v
, long long i
)
148 : "=Q" (v
->counter
) : "d" (i
));
151 static inline long long atomic64_add_return(long long i
, atomic64_t
*v
)
153 return __CSG_LOOP(v
, i
, "agr");
156 static inline long long atomic64_sub_return(long long i
, atomic64_t
*v
)
158 return __CSG_LOOP(v
, i
, "sgr");
161 static inline void atomic64_clear_mask(unsigned long mask
, atomic64_t
*v
)
163 __CSG_LOOP(v
, ~mask
, "ngr");
166 static inline void atomic64_set_mask(unsigned long mask
, atomic64_t
*v
)
168 __CSG_LOOP(v
, mask
, "ogr");
171 #define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
173 static inline long long atomic64_cmpxchg(atomic64_t
*v
,
174 long long old
, long long new)
178 : "+d" (old
), "=Q" (v
->counter
)
179 : "d" (new), "Q" (v
->counter
)
186 #else /* CONFIG_64BIT */
192 static inline long long atomic64_read(const atomic64_t
*v
)
198 : "=&d" (rp
) : "Q" (v
->counter
) );
202 static inline void atomic64_set(atomic64_t
*v
, long long i
)
204 register_pair rp
= {.pair
= i
};
208 : "=Q" (v
->counter
) : "d" (rp
) );
211 static inline long long atomic64_xchg(atomic64_t
*v
, long long new)
213 register_pair rp_new
= {.pair
= new};
214 register_pair rp_old
;
220 : "=&d" (rp_old
), "=Q" (v
->counter
)
221 : "d" (rp_new
), "Q" (v
->counter
)
226 static inline long long atomic64_cmpxchg(atomic64_t
*v
,
227 long long old
, long long new)
229 register_pair rp_old
= {.pair
= old
};
230 register_pair rp_new
= {.pair
= new};
234 : "+&d" (rp_old
), "=Q" (v
->counter
)
235 : "d" (rp_new
), "Q" (v
->counter
)
241 static inline long long atomic64_add_return(long long i
, atomic64_t
*v
)
246 old
= atomic64_read(v
);
248 } while (atomic64_cmpxchg(v
, old
, new) != old
);
252 static inline long long atomic64_sub_return(long long i
, atomic64_t
*v
)
257 old
= atomic64_read(v
);
259 } while (atomic64_cmpxchg(v
, old
, new) != old
);
263 static inline void atomic64_set_mask(unsigned long long mask
, atomic64_t
*v
)
268 old
= atomic64_read(v
);
270 } while (atomic64_cmpxchg(v
, old
, new) != old
);
273 static inline void atomic64_clear_mask(unsigned long long mask
, atomic64_t
*v
)
278 old
= atomic64_read(v
);
280 } while (atomic64_cmpxchg(v
, old
, new) != old
);
283 #endif /* CONFIG_64BIT */
285 static inline int atomic64_add_unless(atomic64_t
*v
, long long a
, long long u
)
289 c
= atomic64_read(v
);
291 if (unlikely(c
== u
))
293 old
= atomic64_cmpxchg(v
, c
, c
+ a
);
294 if (likely(old
== c
))
301 static inline long long atomic64_dec_if_positive(atomic64_t
*v
)
303 long long c
, old
, dec
;
305 c
= atomic64_read(v
);
308 if (unlikely(dec
< 0))
310 old
= atomic64_cmpxchg((v
), c
, dec
);
311 if (likely(old
== c
))
318 #define atomic64_add(_i, _v) atomic64_add_return(_i, _v)
319 #define atomic64_add_negative(_i, _v) (atomic64_add_return(_i, _v) < 0)
320 #define atomic64_inc(_v) atomic64_add_return(1, _v)
321 #define atomic64_inc_return(_v) atomic64_add_return(1, _v)
322 #define atomic64_inc_and_test(_v) (atomic64_add_return(1, _v) == 0)
323 #define atomic64_sub(_i, _v) atomic64_sub_return(_i, _v)
324 #define atomic64_sub_and_test(_i, _v) (atomic64_sub_return(_i, _v) == 0)
325 #define atomic64_dec(_v) atomic64_sub_return(1, _v)
326 #define atomic64_dec_return(_v) atomic64_sub_return(1, _v)
327 #define atomic64_dec_and_test(_v) (atomic64_sub_return(1, _v) == 0)
328 #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
330 #define smp_mb__before_atomic_dec() smp_mb()
331 #define smp_mb__after_atomic_dec() smp_mb()
332 #define smp_mb__before_atomic_inc() smp_mb()
333 #define smp_mb__after_atomic_inc() smp_mb()
335 #include <asm-generic/atomic-long.h>
337 #endif /* __ARCH_S390_ATOMIC__ */