1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_IA64_ATOMIC_H
3 #define _ASM_IA64_ATOMIC_H
4
5 /*
6 * Atomic operations that C can't guarantee us. Useful for
7 * resource counting etc..
8 *
9 * NOTE: don't mess with the types below! The "unsigned long" and
10 * "int" types were carefully placed so as to ensure proper operation
11 * of the macros.
12 *
13 * Copyright (C) 1998, 1999, 2002-2003 Hewlett-Packard Co
14 * David Mosberger-Tang <davidm@hpl.hp.com>
15 */
16 #include <linux/types.h>
17
18 #include <asm/intrinsics.h>
19 #include <asm/barrier.h>
20
21
22 #define ATOMIC_INIT(i) { (i) }
23 #define ATOMIC64_INIT(i) { (i) }
24
25 #define atomic_read(v) READ_ONCE((v)->counter)
26 #define atomic64_read(v) READ_ONCE((v)->counter)
27
28 #define atomic_set(v,i) WRITE_ONCE(((v)->counter), (i))
29 #define atomic64_set(v,i) WRITE_ONCE(((v)->counter), (i))
30
31 #define ATOMIC_OP(op, c_op) \
32 static __inline__ int \
33 ia64_atomic_##op (int i, atomic_t *v) \
34 { \
35 __s32 old, new; \
36 CMPXCHG_BUGCHECK_DECL \
37 \
38 do { \
39 CMPXCHG_BUGCHECK(v); \
40 old = atomic_read(v); \
41 new = old c_op i; \
42 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old); \
43 return new; \
44 }
45
46 #define ATOMIC_FETCH_OP(op, c_op) \
47 static __inline__ int \
48 ia64_atomic_fetch_##op (int i, atomic_t *v) \
49 { \
50 __s32 old, new; \
51 CMPXCHG_BUGCHECK_DECL \
52 \
53 do { \
54 CMPXCHG_BUGCHECK(v); \
55 old = atomic_read(v); \
56 new = old c_op i; \
57 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old); \
58 return old; \
59 }
60
61 #define ATOMIC_OPS(op, c_op) \
62 ATOMIC_OP(op, c_op) \
63 ATOMIC_FETCH_OP(op, c_op)
64
65 ATOMIC_OPS(add, +)
66 ATOMIC_OPS(sub, -)
67
68 #define atomic_add_return(i,v) \
69 ({ \
70 int __ia64_aar_i = (i); \
71 (__builtin_constant_p(i) \
72 && ( (__ia64_aar_i == 1) || (__ia64_aar_i == 4) \
73 || (__ia64_aar_i == 8) || (__ia64_aar_i == 16) \
74 || (__ia64_aar_i == -1) || (__ia64_aar_i == -4) \
75 || (__ia64_aar_i == -8) || (__ia64_aar_i == -16))) \
76 ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \
77 : ia64_atomic_add(__ia64_aar_i, v); \
78 })
79
80 #define atomic_sub_return(i,v) \
81 ({ \
82 int __ia64_asr_i = (i); \
83 (__builtin_constant_p(i) \
84 && ( (__ia64_asr_i == 1) || (__ia64_asr_i == 4) \
85 || (__ia64_asr_i == 8) || (__ia64_asr_i == 16) \
86 || (__ia64_asr_i == -1) || (__ia64_asr_i == -4) \
87 || (__ia64_asr_i == -8) || (__ia64_asr_i == -16))) \
88 ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \
89 : ia64_atomic_sub(__ia64_asr_i, v); \
90 })
91
92 #define atomic_fetch_add(i,v) \
93 ({ \
94 int __ia64_aar_i = (i); \
95 (__builtin_constant_p(i) \
96 && ( (__ia64_aar_i == 1) || (__ia64_aar_i == 4) \
97 || (__ia64_aar_i == 8) || (__ia64_aar_i == 16) \
98 || (__ia64_aar_i == -1) || (__ia64_aar_i == -4) \
99 || (__ia64_aar_i == -8) || (__ia64_aar_i == -16))) \
100 ? ia64_fetchadd(__ia64_aar_i, &(v)->counter, acq) \
101 : ia64_atomic_fetch_add(__ia64_aar_i, v); \
102 })
103
104 #define atomic_fetch_sub(i,v) \
105 ({ \
106 int __ia64_asr_i = (i); \
107 (__builtin_constant_p(i) \
108 && ( (__ia64_asr_i == 1) || (__ia64_asr_i == 4) \
109 || (__ia64_asr_i == 8) || (__ia64_asr_i == 16) \
110 || (__ia64_asr_i == -1) || (__ia64_asr_i == -4) \
111 || (__ia64_asr_i == -8) || (__ia64_asr_i == -16))) \
112 ? ia64_fetchadd(-__ia64_asr_i, &(v)->counter, acq) \
113 : ia64_atomic_fetch_sub(__ia64_asr_i, v); \
114 })
115
116 ATOMIC_FETCH_OP(and, &)
117 ATOMIC_FETCH_OP(or, |)
118 ATOMIC_FETCH_OP(xor, ^)
119
120 #define atomic_and(i,v) (void)ia64_atomic_fetch_and(i,v)
121 #define atomic_or(i,v) (void)ia64_atomic_fetch_or(i,v)
122 #define atomic_xor(i,v) (void)ia64_atomic_fetch_xor(i,v)
123
124 #define atomic_fetch_and(i,v) ia64_atomic_fetch_and(i,v)
125 #define atomic_fetch_or(i,v) ia64_atomic_fetch_or(i,v)
126 #define atomic_fetch_xor(i,v) ia64_atomic_fetch_xor(i,v)
127
128 #undef ATOMIC_OPS
129 #undef ATOMIC_FETCH_OP
130 #undef ATOMIC_OP
131
132 #define ATOMIC64_OP(op, c_op) \
133 static __inline__ long \
134 ia64_atomic64_##op (__s64 i, atomic64_t *v) \
135 { \
136 __s64 old, new; \
137 CMPXCHG_BUGCHECK_DECL \
138 \
139 do { \
140 CMPXCHG_BUGCHECK(v); \
141 old = atomic64_read(v); \
142 new = old c_op i; \
143 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old); \
144 return new; \
145 }
146
147 #define ATOMIC64_FETCH_OP(op, c_op) \
148 static __inline__ long \
149 ia64_atomic64_fetch_##op (__s64 i, atomic64_t *v) \
150 { \
151 __s64 old, new; \
152 CMPXCHG_BUGCHECK_DECL \
153 \
154 do { \
155 CMPXCHG_BUGCHECK(v); \
156 old = atomic64_read(v); \
157 new = old c_op i; \
158 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old); \
159 return old; \
160 }
161
162 #define ATOMIC64_OPS(op, c_op) \
163 ATOMIC64_OP(op, c_op) \
164 ATOMIC64_FETCH_OP(op, c_op)
165
166 ATOMIC64_OPS(add, +)
167 ATOMIC64_OPS(sub, -)
168
169 #define atomic64_add_return(i,v) \
170 ({ \
171 long __ia64_aar_i = (i); \
172 (__builtin_constant_p(i) \
173 && ( (__ia64_aar_i == 1) || (__ia64_aar_i == 4) \
174 || (__ia64_aar_i == 8) || (__ia64_aar_i == 16) \
175 || (__ia64_aar_i == -1) || (__ia64_aar_i == -4) \
176 || (__ia64_aar_i == -8) || (__ia64_aar_i == -16))) \
177 ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \
178 : ia64_atomic64_add(__ia64_aar_i, v); \
179 })
180
181 #define atomic64_sub_return(i,v) \
182 ({ \
183 long __ia64_asr_i = (i); \
184 (__builtin_constant_p(i) \
185 && ( (__ia64_asr_i == 1) || (__ia64_asr_i == 4) \
186 || (__ia64_asr_i == 8) || (__ia64_asr_i == 16) \
187 || (__ia64_asr_i == -1) || (__ia64_asr_i == -4) \
188 || (__ia64_asr_i == -8) || (__ia64_asr_i == -16))) \
189 ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \
190 : ia64_atomic64_sub(__ia64_asr_i, v); \
191 })
192
193 #define atomic64_fetch_add(i,v) \
194 ({ \
195 long __ia64_aar_i = (i); \
196 (__builtin_constant_p(i) \
197 && ( (__ia64_aar_i == 1) || (__ia64_aar_i == 4) \
198 || (__ia64_aar_i == 8) || (__ia64_aar_i == 16) \
199 || (__ia64_aar_i == -1) || (__ia64_aar_i == -4) \
200 || (__ia64_aar_i == -8) || (__ia64_aar_i == -16))) \
201 ? ia64_fetchadd(__ia64_aar_i, &(v)->counter, acq) \
202 : ia64_atomic64_fetch_add(__ia64_aar_i, v); \
203 })
204
205 #define atomic64_fetch_sub(i,v) \
206 ({ \
207 long __ia64_asr_i = (i); \
208 (__builtin_constant_p(i) \
209 && ( (__ia64_asr_i == 1) || (__ia64_asr_i == 4) \
210 || (__ia64_asr_i == 8) || (__ia64_asr_i == 16) \
211 || (__ia64_asr_i == -1) || (__ia64_asr_i == -4) \
212 || (__ia64_asr_i == -8) || (__ia64_asr_i == -16))) \
213 ? ia64_fetchadd(-__ia64_asr_i, &(v)->counter, acq) \
214 : ia64_atomic64_fetch_sub(__ia64_asr_i, v); \
215 })
216
217 ATOMIC64_FETCH_OP(and, &)
218 ATOMIC64_FETCH_OP(or, |)
219 ATOMIC64_FETCH_OP(xor, ^)
220
221 #define atomic64_and(i,v) (void)ia64_atomic64_fetch_and(i,v)
222 #define atomic64_or(i,v) (void)ia64_atomic64_fetch_or(i,v)
223 #define atomic64_xor(i,v) (void)ia64_atomic64_fetch_xor(i,v)
224
225 #define atomic64_fetch_and(i,v) ia64_atomic64_fetch_and(i,v)
226 #define atomic64_fetch_or(i,v) ia64_atomic64_fetch_or(i,v)
227 #define atomic64_fetch_xor(i,v) ia64_atomic64_fetch_xor(i,v)
228
229 #undef ATOMIC64_OPS
230 #undef ATOMIC64_FETCH_OP
231 #undef ATOMIC64_OP
232
233 #define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
234 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
235
236 #define atomic64_cmpxchg(v, old, new) \
237 (cmpxchg(&((v)->counter), old, new))
238 #define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
239
__atomic_add_unless(atomic_t * v,int a,int u)240 static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
241 {
242 int c, old;
243 c = atomic_read(v);
244 for (;;) {
245 if (unlikely(c == (u)))
246 break;
247 old = atomic_cmpxchg((v), c, c + (a));
248 if (likely(old == c))
249 break;
250 c = old;
251 }
252 return c;
253 }
254
255
atomic64_add_unless(atomic64_t * v,long a,long u)256 static __inline__ long atomic64_add_unless(atomic64_t *v, long a, long u)
257 {
258 long c, old;
259 c = atomic64_read(v);
260 for (;;) {
261 if (unlikely(c == (u)))
262 break;
263 old = atomic64_cmpxchg((v), c, c + (a));
264 if (likely(old == c))
265 break;
266 c = old;
267 }
268 return c != (u);
269 }
270
271 #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
272
atomic64_dec_if_positive(atomic64_t * v)273 static __inline__ long atomic64_dec_if_positive(atomic64_t *v)
274 {
275 long c, old, dec;
276 c = atomic64_read(v);
277 for (;;) {
278 dec = c - 1;
279 if (unlikely(dec < 0))
280 break;
281 old = atomic64_cmpxchg((v), c, dec);
282 if (likely(old == c))
283 break;
284 c = old;
285 }
286 return dec;
287 }
288
289 /*
290 * Atomically add I to V and return TRUE if the resulting value is
291 * negative.
292 */
293 static __inline__ int
atomic_add_negative(int i,atomic_t * v)294 atomic_add_negative (int i, atomic_t *v)
295 {
296 return atomic_add_return(i, v) < 0;
297 }
298
299 static __inline__ long
atomic64_add_negative(__s64 i,atomic64_t * v)300 atomic64_add_negative (__s64 i, atomic64_t *v)
301 {
302 return atomic64_add_return(i, v) < 0;
303 }
304
305 #define atomic_dec_return(v) atomic_sub_return(1, (v))
306 #define atomic_inc_return(v) atomic_add_return(1, (v))
307 #define atomic64_dec_return(v) atomic64_sub_return(1, (v))
308 #define atomic64_inc_return(v) atomic64_add_return(1, (v))
309
310 #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
311 #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
312 #define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0)
313 #define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0)
314 #define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0)
315 #define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0)
316
317 #define atomic_add(i,v) (void)atomic_add_return((i), (v))
318 #define atomic_sub(i,v) (void)atomic_sub_return((i), (v))
319 #define atomic_inc(v) atomic_add(1, (v))
320 #define atomic_dec(v) atomic_sub(1, (v))
321
322 #define atomic64_add(i,v) (void)atomic64_add_return((i), (v))
323 #define atomic64_sub(i,v) (void)atomic64_sub_return((i), (v))
324 #define atomic64_inc(v) atomic64_add(1, (v))
325 #define atomic64_dec(v) atomic64_sub(1, (v))
326
327 #endif /* _ASM_IA64_ATOMIC_H */
328