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867e359b CM |
1 | /* |
2 | * Copyright 2010 Tilera Corporation. All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation, version 2. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
11 | * NON INFRINGEMENT. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * Atomic primitives. | |
15 | */ | |
16 | ||
17 | #ifndef _ASM_TILE_ATOMIC_H | |
18 | #define _ASM_TILE_ATOMIC_H | |
19 | ||
34f2c0ac PG |
20 | #include <asm/cmpxchg.h> |
21 | ||
867e359b CM |
22 | #ifndef __ASSEMBLY__ |
23 | ||
24 | #include <linux/compiler.h> | |
bd119c69 | 25 | #include <linux/types.h> |
867e359b CM |
26 | |
27 | #define ATOMIC_INIT(i) { (i) } | |
28 | ||
29 | /** | |
30 | * atomic_read - read atomic variable | |
31 | * @v: pointer of type atomic_t | |
32 | * | |
33 | * Atomically reads the value of @v. | |
34 | */ | |
35 | static inline int atomic_read(const atomic_t *v) | |
36 | { | |
62e8a325 | 37 | return READ_ONCE(v->counter); |
867e359b CM |
38 | } |
39 | ||
40 | /** | |
41 | * atomic_sub_return - subtract integer and return | |
42 | * @v: pointer of type atomic_t | |
43 | * @i: integer value to subtract | |
44 | * | |
45 | * Atomically subtracts @i from @v and returns @v - @i | |
46 | */ | |
47 | #define atomic_sub_return(i, v) atomic_add_return((int)(-(i)), (v)) | |
48 | ||
1af5de9a PZ |
49 | #define atomic_fetch_sub(i, v) atomic_fetch_add(-(int)(i), (v)) |
50 | ||
867e359b CM |
51 | /** |
52 | * atomic_sub - subtract integer from atomic variable | |
53 | * @i: integer value to subtract | |
54 | * @v: pointer of type atomic_t | |
55 | * | |
56 | * Atomically subtracts @i from @v. | |
57 | */ | |
58 | #define atomic_sub(i, v) atomic_add((int)(-(i)), (v)) | |
59 | ||
60 | /** | |
61 | * atomic_sub_and_test - subtract value from variable and test result | |
62 | * @i: integer value to subtract | |
63 | * @v: pointer of type atomic_t | |
64 | * | |
65 | * Atomically subtracts @i from @v and returns true if the result is | |
66 | * zero, or false for all other cases. | |
67 | */ | |
68 | #define atomic_sub_and_test(i, v) (atomic_sub_return((i), (v)) == 0) | |
69 | ||
70 | /** | |
71 | * atomic_inc_return - increment memory and return | |
72 | * @v: pointer of type atomic_t | |
73 | * | |
74 | * Atomically increments @v by 1 and returns the new value. | |
75 | */ | |
76 | #define atomic_inc_return(v) atomic_add_return(1, (v)) | |
77 | ||
78 | /** | |
79 | * atomic_dec_return - decrement memory and return | |
80 | * @v: pointer of type atomic_t | |
81 | * | |
82 | * Atomically decrements @v by 1 and returns the new value. | |
83 | */ | |
84 | #define atomic_dec_return(v) atomic_sub_return(1, (v)) | |
85 | ||
86 | /** | |
87 | * atomic_inc - increment atomic variable | |
88 | * @v: pointer of type atomic_t | |
89 | * | |
90 | * Atomically increments @v by 1. | |
91 | */ | |
92 | #define atomic_inc(v) atomic_add(1, (v)) | |
93 | ||
94 | /** | |
95 | * atomic_dec - decrement atomic variable | |
96 | * @v: pointer of type atomic_t | |
97 | * | |
98 | * Atomically decrements @v by 1. | |
99 | */ | |
100 | #define atomic_dec(v) atomic_sub(1, (v)) | |
101 | ||
102 | /** | |
103 | * atomic_dec_and_test - decrement and test | |
104 | * @v: pointer of type atomic_t | |
105 | * | |
106 | * Atomically decrements @v by 1 and returns true if the result is 0. | |
107 | */ | |
108 | #define atomic_dec_and_test(v) (atomic_dec_return(v) == 0) | |
109 | ||
110 | /** | |
111 | * atomic_inc_and_test - increment and test | |
112 | * @v: pointer of type atomic_t | |
113 | * | |
114 | * Atomically increments @v by 1 and returns true if the result is 0. | |
115 | */ | |
116 | #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) | |
117 | ||
6dc9658f CM |
118 | /** |
119 | * atomic_xchg - atomically exchange contents of memory with a new value | |
120 | * @v: pointer of type atomic_t | |
121 | * @i: integer value to store in memory | |
122 | * | |
123 | * Atomically sets @v to @i and returns old @v | |
124 | */ | |
125 | static inline int atomic_xchg(atomic_t *v, int n) | |
126 | { | |
127 | return xchg(&v->counter, n); | |
128 | } | |
129 | ||
130 | /** | |
131 | * atomic_cmpxchg - atomically exchange contents of memory if it matches | |
132 | * @v: pointer of type atomic_t | |
133 | * @o: old value that memory should have | |
134 | * @n: new value to write to memory if it matches | |
135 | * | |
136 | * Atomically checks if @v holds @o and replaces it with @n if so. | |
137 | * Returns the old value at @v. | |
138 | */ | |
139 | static inline int atomic_cmpxchg(atomic_t *v, int o, int n) | |
140 | { | |
141 | return cmpxchg(&v->counter, o, n); | |
142 | } | |
143 | ||
867e359b CM |
144 | /** |
145 | * atomic_add_negative - add and test if negative | |
146 | * @v: pointer of type atomic_t | |
147 | * @i: integer value to add | |
148 | * | |
149 | * Atomically adds @i to @v and returns true if the result is | |
150 | * negative, or false when result is greater than or equal to zero. | |
151 | */ | |
152 | #define atomic_add_negative(i, v) (atomic_add_return((i), (v)) < 0) | |
153 | ||
867e359b CM |
154 | #endif /* __ASSEMBLY__ */ |
155 | ||
156 | #ifndef __tilegx__ | |
157 | #include <asm/atomic_32.h> | |
158 | #else | |
159 | #include <asm/atomic_64.h> | |
160 | #endif | |
161 | ||
adf6d9b3 CM |
162 | #ifndef __ASSEMBLY__ |
163 | ||
6dc9658f CM |
164 | /** |
165 | * atomic64_xchg - atomically exchange contents of memory with a new value | |
166 | * @v: pointer of type atomic64_t | |
167 | * @i: integer value to store in memory | |
168 | * | |
169 | * Atomically sets @v to @i and returns old @v | |
170 | */ | |
b924a690 | 171 | static inline long long atomic64_xchg(atomic64_t *v, long long n) |
6dc9658f CM |
172 | { |
173 | return xchg64(&v->counter, n); | |
174 | } | |
175 | ||
176 | /** | |
177 | * atomic64_cmpxchg - atomically exchange contents of memory if it matches | |
178 | * @v: pointer of type atomic64_t | |
179 | * @o: old value that memory should have | |
180 | * @n: new value to write to memory if it matches | |
181 | * | |
182 | * Atomically checks if @v holds @o and replaces it with @n if so. | |
183 | * Returns the old value at @v. | |
184 | */ | |
b924a690 CG |
185 | static inline long long atomic64_cmpxchg(atomic64_t *v, long long o, |
186 | long long n) | |
6dc9658f CM |
187 | { |
188 | return cmpxchg64(&v->counter, o, n); | |
189 | } | |
190 | ||
adf6d9b3 CM |
191 | static inline long long atomic64_dec_if_positive(atomic64_t *v) |
192 | { | |
193 | long long c, old, dec; | |
194 | ||
195 | c = atomic64_read(v); | |
196 | for (;;) { | |
197 | dec = c - 1; | |
198 | if (unlikely(dec < 0)) | |
199 | break; | |
200 | old = atomic64_cmpxchg((v), c, dec); | |
201 | if (likely(old == c)) | |
202 | break; | |
203 | c = old; | |
204 | } | |
205 | return dec; | |
206 | } | |
207 | ||
208 | #endif /* __ASSEMBLY__ */ | |
209 | ||
867e359b | 210 | #endif /* _ASM_TILE_ATOMIC_H */ |