Chris Metcalf | 867e359 | 2010-05-28 23:09:12 -0400 | [diff] [blame] | 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 | |
Paul Gortmaker | 34f2c0a | 2012-04-01 16:38:46 -0400 | [diff] [blame] | 20 | #include <asm/cmpxchg.h> |
| 21 | |
Chris Metcalf | 867e359 | 2010-05-28 23:09:12 -0400 | [diff] [blame] | 22 | #ifndef __ASSEMBLY__ |
| 23 | |
| 24 | #include <linux/compiler.h> |
David Howells | bd119c6 | 2012-03-28 18:30:03 +0100 | [diff] [blame] | 25 | #include <linux/types.h> |
Chris Metcalf | 867e359 | 2010-05-28 23:09:12 -0400 | [diff] [blame] | 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 | { |
Peter Zijlstra | 62e8a32 | 2015-09-18 11:13:10 +0200 | [diff] [blame] | 37 | return READ_ONCE(v->counter); |
Chris Metcalf | 867e359 | 2010-05-28 23:09:12 -0400 | [diff] [blame] | 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 | |
Peter Zijlstra | 1af5de9 | 2016-04-18 01:16:03 +0200 | [diff] [blame] | 49 | #define atomic_fetch_sub(i, v) atomic_fetch_add(-(int)(i), (v)) |
| 50 | |
| 51 | #define atomic_fetch_or atomic_fetch_or |
| 52 | |
Chris Metcalf | 867e359 | 2010-05-28 23:09:12 -0400 | [diff] [blame] | 53 | /** |
| 54 | * atomic_sub - subtract integer from atomic variable |
| 55 | * @i: integer value to subtract |
| 56 | * @v: pointer of type atomic_t |
| 57 | * |
| 58 | * Atomically subtracts @i from @v. |
| 59 | */ |
| 60 | #define atomic_sub(i, v) atomic_add((int)(-(i)), (v)) |
| 61 | |
| 62 | /** |
| 63 | * atomic_sub_and_test - subtract value from variable and test result |
| 64 | * @i: integer value to subtract |
| 65 | * @v: pointer of type atomic_t |
| 66 | * |
| 67 | * Atomically subtracts @i from @v and returns true if the result is |
| 68 | * zero, or false for all other cases. |
| 69 | */ |
| 70 | #define atomic_sub_and_test(i, v) (atomic_sub_return((i), (v)) == 0) |
| 71 | |
| 72 | /** |
| 73 | * atomic_inc_return - increment memory and return |
| 74 | * @v: pointer of type atomic_t |
| 75 | * |
| 76 | * Atomically increments @v by 1 and returns the new value. |
| 77 | */ |
| 78 | #define atomic_inc_return(v) atomic_add_return(1, (v)) |
| 79 | |
| 80 | /** |
| 81 | * atomic_dec_return - decrement memory and return |
| 82 | * @v: pointer of type atomic_t |
| 83 | * |
| 84 | * Atomically decrements @v by 1 and returns the new value. |
| 85 | */ |
| 86 | #define atomic_dec_return(v) atomic_sub_return(1, (v)) |
| 87 | |
| 88 | /** |
| 89 | * atomic_inc - increment atomic variable |
| 90 | * @v: pointer of type atomic_t |
| 91 | * |
| 92 | * Atomically increments @v by 1. |
| 93 | */ |
| 94 | #define atomic_inc(v) atomic_add(1, (v)) |
| 95 | |
| 96 | /** |
| 97 | * atomic_dec - decrement atomic variable |
| 98 | * @v: pointer of type atomic_t |
| 99 | * |
| 100 | * Atomically decrements @v by 1. |
| 101 | */ |
| 102 | #define atomic_dec(v) atomic_sub(1, (v)) |
| 103 | |
| 104 | /** |
| 105 | * atomic_dec_and_test - decrement and test |
| 106 | * @v: pointer of type atomic_t |
| 107 | * |
| 108 | * Atomically decrements @v by 1 and returns true if the result is 0. |
| 109 | */ |
| 110 | #define atomic_dec_and_test(v) (atomic_dec_return(v) == 0) |
| 111 | |
| 112 | /** |
| 113 | * atomic_inc_and_test - increment and test |
| 114 | * @v: pointer of type atomic_t |
| 115 | * |
| 116 | * Atomically increments @v by 1 and returns true if the result is 0. |
| 117 | */ |
| 118 | #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) |
| 119 | |
| 120 | /** |
Chris Metcalf | 6dc9658 | 2013-09-06 08:56:45 -0400 | [diff] [blame] | 121 | * atomic_xchg - atomically exchange contents of memory with a new value |
| 122 | * @v: pointer of type atomic_t |
| 123 | * @i: integer value to store in memory |
| 124 | * |
| 125 | * Atomically sets @v to @i and returns old @v |
| 126 | */ |
| 127 | static inline int atomic_xchg(atomic_t *v, int n) |
| 128 | { |
| 129 | return xchg(&v->counter, n); |
| 130 | } |
| 131 | |
| 132 | /** |
| 133 | * atomic_cmpxchg - atomically exchange contents of memory if it matches |
| 134 | * @v: pointer of type atomic_t |
| 135 | * @o: old value that memory should have |
| 136 | * @n: new value to write to memory if it matches |
| 137 | * |
| 138 | * Atomically checks if @v holds @o and replaces it with @n if so. |
| 139 | * Returns the old value at @v. |
| 140 | */ |
| 141 | static inline int atomic_cmpxchg(atomic_t *v, int o, int n) |
| 142 | { |
| 143 | return cmpxchg(&v->counter, o, n); |
| 144 | } |
| 145 | |
| 146 | /** |
Chris Metcalf | 867e359 | 2010-05-28 23:09:12 -0400 | [diff] [blame] | 147 | * atomic_add_negative - add and test if negative |
| 148 | * @v: pointer of type atomic_t |
| 149 | * @i: integer value to add |
| 150 | * |
| 151 | * Atomically adds @i to @v and returns true if the result is |
| 152 | * negative, or false when result is greater than or equal to zero. |
| 153 | */ |
| 154 | #define atomic_add_negative(i, v) (atomic_add_return((i), (v)) < 0) |
| 155 | |
Chris Metcalf | 867e359 | 2010-05-28 23:09:12 -0400 | [diff] [blame] | 156 | #endif /* __ASSEMBLY__ */ |
| 157 | |
| 158 | #ifndef __tilegx__ |
| 159 | #include <asm/atomic_32.h> |
| 160 | #else |
| 161 | #include <asm/atomic_64.h> |
| 162 | #endif |
| 163 | |
Chris Metcalf | adf6d9b | 2013-02-01 12:37:48 -0500 | [diff] [blame] | 164 | #ifndef __ASSEMBLY__ |
| 165 | |
Chris Metcalf | 6dc9658 | 2013-09-06 08:56:45 -0400 | [diff] [blame] | 166 | /** |
| 167 | * atomic64_xchg - atomically exchange contents of memory with a new value |
| 168 | * @v: pointer of type atomic64_t |
| 169 | * @i: integer value to store in memory |
| 170 | * |
| 171 | * Atomically sets @v to @i and returns old @v |
| 172 | */ |
Chen Gang | b924a69 | 2013-09-25 12:14:08 +0800 | [diff] [blame] | 173 | static inline long long atomic64_xchg(atomic64_t *v, long long n) |
Chris Metcalf | 6dc9658 | 2013-09-06 08:56:45 -0400 | [diff] [blame] | 174 | { |
| 175 | return xchg64(&v->counter, n); |
| 176 | } |
| 177 | |
| 178 | /** |
| 179 | * atomic64_cmpxchg - atomically exchange contents of memory if it matches |
| 180 | * @v: pointer of type atomic64_t |
| 181 | * @o: old value that memory should have |
| 182 | * @n: new value to write to memory if it matches |
| 183 | * |
| 184 | * Atomically checks if @v holds @o and replaces it with @n if so. |
| 185 | * Returns the old value at @v. |
| 186 | */ |
Chen Gang | b924a69 | 2013-09-25 12:14:08 +0800 | [diff] [blame] | 187 | static inline long long atomic64_cmpxchg(atomic64_t *v, long long o, |
| 188 | long long n) |
Chris Metcalf | 6dc9658 | 2013-09-06 08:56:45 -0400 | [diff] [blame] | 189 | { |
| 190 | return cmpxchg64(&v->counter, o, n); |
| 191 | } |
| 192 | |
Chris Metcalf | adf6d9b | 2013-02-01 12:37:48 -0500 | [diff] [blame] | 193 | static inline long long atomic64_dec_if_positive(atomic64_t *v) |
| 194 | { |
| 195 | long long c, old, dec; |
| 196 | |
| 197 | c = atomic64_read(v); |
| 198 | for (;;) { |
| 199 | dec = c - 1; |
| 200 | if (unlikely(dec < 0)) |
| 201 | break; |
| 202 | old = atomic64_cmpxchg((v), c, dec); |
| 203 | if (likely(old == c)) |
| 204 | break; |
| 205 | c = old; |
| 206 | } |
| 207 | return dec; |
| 208 | } |
| 209 | |
| 210 | #endif /* __ASSEMBLY__ */ |
| 211 | |
Chris Metcalf | 867e359 | 2010-05-28 23:09:12 -0400 | [diff] [blame] | 212 | #endif /* _ASM_TILE_ATOMIC_H */ |