Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _ALPHA_ATOMIC_H |
| 2 | #define _ALPHA_ATOMIC_H |
| 3 | |
Matthew Wilcox | ea435467 | 2009-01-06 14:40:39 -0800 | [diff] [blame] | 4 | #include <linux/types.h> |
Andrew Morton | 0db9ae4 | 2005-10-24 23:05:58 -0700 | [diff] [blame] | 5 | #include <asm/barrier.h> |
| 6 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | /* |
| 8 | * Atomic operations that C can't guarantee us. Useful for |
| 9 | * resource counting etc... |
| 10 | * |
| 11 | * But use these as seldom as possible since they are much slower |
| 12 | * than regular operations. |
| 13 | */ |
| 14 | |
| 15 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #define ATOMIC_INIT(i) ( (atomic_t) { (i) } ) |
| 17 | #define ATOMIC64_INIT(i) ( (atomic64_t) { (i) } ) |
| 18 | |
Anton Blanchard | f3d46f9 | 2010-05-17 14:33:53 +1000 | [diff] [blame] | 19 | #define atomic_read(v) (*(volatile int *)&(v)->counter) |
| 20 | #define atomic64_read(v) (*(volatile long *)&(v)->counter) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
| 22 | #define atomic_set(v,i) ((v)->counter = (i)) |
| 23 | #define atomic64_set(v,i) ((v)->counter = (i)) |
| 24 | |
| 25 | /* |
| 26 | * To get proper branch prediction for the main line, we must branch |
| 27 | * forward to code at the end of this object's .text section, then |
| 28 | * branch back to restart the operation. |
| 29 | */ |
| 30 | |
| 31 | static __inline__ void atomic_add(int i, atomic_t * v) |
| 32 | { |
| 33 | unsigned long temp; |
| 34 | __asm__ __volatile__( |
| 35 | "1: ldl_l %0,%1\n" |
| 36 | " addl %0,%2,%0\n" |
| 37 | " stl_c %0,%1\n" |
| 38 | " beq %0,2f\n" |
| 39 | ".subsection 2\n" |
| 40 | "2: br 1b\n" |
| 41 | ".previous" |
| 42 | :"=&r" (temp), "=m" (v->counter) |
| 43 | :"Ir" (i), "m" (v->counter)); |
| 44 | } |
| 45 | |
| 46 | static __inline__ void atomic64_add(long i, atomic64_t * v) |
| 47 | { |
| 48 | unsigned long temp; |
| 49 | __asm__ __volatile__( |
| 50 | "1: ldq_l %0,%1\n" |
| 51 | " addq %0,%2,%0\n" |
| 52 | " stq_c %0,%1\n" |
| 53 | " beq %0,2f\n" |
| 54 | ".subsection 2\n" |
| 55 | "2: br 1b\n" |
| 56 | ".previous" |
| 57 | :"=&r" (temp), "=m" (v->counter) |
| 58 | :"Ir" (i), "m" (v->counter)); |
| 59 | } |
| 60 | |
| 61 | static __inline__ void atomic_sub(int i, atomic_t * v) |
| 62 | { |
| 63 | unsigned long temp; |
| 64 | __asm__ __volatile__( |
| 65 | "1: ldl_l %0,%1\n" |
| 66 | " subl %0,%2,%0\n" |
| 67 | " stl_c %0,%1\n" |
| 68 | " beq %0,2f\n" |
| 69 | ".subsection 2\n" |
| 70 | "2: br 1b\n" |
| 71 | ".previous" |
| 72 | :"=&r" (temp), "=m" (v->counter) |
| 73 | :"Ir" (i), "m" (v->counter)); |
| 74 | } |
| 75 | |
| 76 | static __inline__ void atomic64_sub(long i, atomic64_t * v) |
| 77 | { |
| 78 | unsigned long temp; |
| 79 | __asm__ __volatile__( |
| 80 | "1: ldq_l %0,%1\n" |
| 81 | " subq %0,%2,%0\n" |
| 82 | " stq_c %0,%1\n" |
| 83 | " beq %0,2f\n" |
| 84 | ".subsection 2\n" |
| 85 | "2: br 1b\n" |
| 86 | ".previous" |
| 87 | :"=&r" (temp), "=m" (v->counter) |
| 88 | :"Ir" (i), "m" (v->counter)); |
| 89 | } |
| 90 | |
| 91 | |
| 92 | /* |
| 93 | * Same as above, but return the result value |
| 94 | */ |
Andrew Morton | 26a6e66 | 2008-02-04 22:30:02 -0800 | [diff] [blame] | 95 | static inline int atomic_add_return(int i, atomic_t *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | { |
| 97 | long temp, result; |
Ivan Kokshaysky | d475f3f | 2005-10-21 22:06:15 +0400 | [diff] [blame] | 98 | smp_mb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | __asm__ __volatile__( |
| 100 | "1: ldl_l %0,%1\n" |
| 101 | " addl %0,%3,%2\n" |
| 102 | " addl %0,%3,%0\n" |
| 103 | " stl_c %0,%1\n" |
| 104 | " beq %0,2f\n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | ".subsection 2\n" |
| 106 | "2: br 1b\n" |
| 107 | ".previous" |
| 108 | :"=&r" (temp), "=m" (v->counter), "=&r" (result) |
| 109 | :"Ir" (i), "m" (v->counter) : "memory"); |
Ivan Kokshaysky | d475f3f | 2005-10-21 22:06:15 +0400 | [diff] [blame] | 110 | smp_mb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | return result; |
| 112 | } |
| 113 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | static __inline__ long atomic64_add_return(long i, atomic64_t * v) |
| 115 | { |
| 116 | long temp, result; |
Ivan Kokshaysky | d475f3f | 2005-10-21 22:06:15 +0400 | [diff] [blame] | 117 | smp_mb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | __asm__ __volatile__( |
| 119 | "1: ldq_l %0,%1\n" |
| 120 | " addq %0,%3,%2\n" |
| 121 | " addq %0,%3,%0\n" |
| 122 | " stq_c %0,%1\n" |
| 123 | " beq %0,2f\n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | ".subsection 2\n" |
| 125 | "2: br 1b\n" |
| 126 | ".previous" |
| 127 | :"=&r" (temp), "=m" (v->counter), "=&r" (result) |
| 128 | :"Ir" (i), "m" (v->counter) : "memory"); |
Ivan Kokshaysky | d475f3f | 2005-10-21 22:06:15 +0400 | [diff] [blame] | 129 | smp_mb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | return result; |
| 131 | } |
| 132 | |
| 133 | static __inline__ long atomic_sub_return(int i, atomic_t * v) |
| 134 | { |
| 135 | long temp, result; |
Ivan Kokshaysky | d475f3f | 2005-10-21 22:06:15 +0400 | [diff] [blame] | 136 | smp_mb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | __asm__ __volatile__( |
| 138 | "1: ldl_l %0,%1\n" |
| 139 | " subl %0,%3,%2\n" |
| 140 | " subl %0,%3,%0\n" |
| 141 | " stl_c %0,%1\n" |
| 142 | " beq %0,2f\n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | ".subsection 2\n" |
| 144 | "2: br 1b\n" |
| 145 | ".previous" |
| 146 | :"=&r" (temp), "=m" (v->counter), "=&r" (result) |
| 147 | :"Ir" (i), "m" (v->counter) : "memory"); |
Ivan Kokshaysky | d475f3f | 2005-10-21 22:06:15 +0400 | [diff] [blame] | 148 | smp_mb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | return result; |
| 150 | } |
| 151 | |
| 152 | static __inline__ long atomic64_sub_return(long i, atomic64_t * v) |
| 153 | { |
| 154 | long temp, result; |
Ivan Kokshaysky | d475f3f | 2005-10-21 22:06:15 +0400 | [diff] [blame] | 155 | smp_mb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | __asm__ __volatile__( |
| 157 | "1: ldq_l %0,%1\n" |
| 158 | " subq %0,%3,%2\n" |
| 159 | " subq %0,%3,%0\n" |
| 160 | " stq_c %0,%1\n" |
| 161 | " beq %0,2f\n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | ".subsection 2\n" |
| 163 | "2: br 1b\n" |
| 164 | ".previous" |
| 165 | :"=&r" (temp), "=m" (v->counter), "=&r" (result) |
| 166 | :"Ir" (i), "m" (v->counter) : "memory"); |
Ivan Kokshaysky | d475f3f | 2005-10-21 22:06:15 +0400 | [diff] [blame] | 167 | smp_mb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | return result; |
| 169 | } |
| 170 | |
David Howells | ec22120 | 2012-03-28 18:11:12 +0100 | [diff] [blame^] | 171 | /* |
| 172 | * Atomic exchange routines. |
| 173 | */ |
| 174 | |
| 175 | #define __ASM__MB |
| 176 | #define ____xchg(type, args...) __xchg ## type ## _local(args) |
| 177 | #define ____cmpxchg(type, args...) __cmpxchg ## type ## _local(args) |
| 178 | #include <asm/xchg.h> |
| 179 | |
| 180 | #define xchg_local(ptr,x) \ |
| 181 | ({ \ |
| 182 | __typeof__(*(ptr)) _x_ = (x); \ |
| 183 | (__typeof__(*(ptr))) __xchg_local((ptr), (unsigned long)_x_, \ |
| 184 | sizeof(*(ptr))); \ |
| 185 | }) |
| 186 | |
| 187 | #define cmpxchg_local(ptr, o, n) \ |
| 188 | ({ \ |
| 189 | __typeof__(*(ptr)) _o_ = (o); \ |
| 190 | __typeof__(*(ptr)) _n_ = (n); \ |
| 191 | (__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_, \ |
| 192 | (unsigned long)_n_, \ |
| 193 | sizeof(*(ptr))); \ |
| 194 | }) |
| 195 | |
| 196 | #define cmpxchg64_local(ptr, o, n) \ |
| 197 | ({ \ |
| 198 | BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ |
| 199 | cmpxchg_local((ptr), (o), (n)); \ |
| 200 | }) |
| 201 | |
| 202 | #ifdef CONFIG_SMP |
| 203 | #undef __ASM__MB |
| 204 | #define __ASM__MB "\tmb\n" |
| 205 | #endif |
| 206 | #undef ____xchg |
| 207 | #undef ____cmpxchg |
| 208 | #define ____xchg(type, args...) __xchg ##type(args) |
| 209 | #define ____cmpxchg(type, args...) __cmpxchg ##type(args) |
| 210 | #include <asm/xchg.h> |
| 211 | |
| 212 | #define xchg(ptr,x) \ |
| 213 | ({ \ |
| 214 | __typeof__(*(ptr)) _x_ = (x); \ |
| 215 | (__typeof__(*(ptr))) __xchg((ptr), (unsigned long)_x_, \ |
| 216 | sizeof(*(ptr))); \ |
| 217 | }) |
| 218 | |
| 219 | #define cmpxchg(ptr, o, n) \ |
| 220 | ({ \ |
| 221 | __typeof__(*(ptr)) _o_ = (o); \ |
| 222 | __typeof__(*(ptr)) _n_ = (n); \ |
| 223 | (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \ |
| 224 | (unsigned long)_n_, sizeof(*(ptr)));\ |
| 225 | }) |
| 226 | |
| 227 | #define cmpxchg64(ptr, o, n) \ |
| 228 | ({ \ |
| 229 | BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ |
| 230 | cmpxchg((ptr), (o), (n)); \ |
| 231 | }) |
| 232 | |
| 233 | #undef __ASM__MB |
| 234 | #undef ____cmpxchg |
| 235 | |
| 236 | #define __HAVE_ARCH_CMPXCHG 1 |
| 237 | |
Mathieu Desnoyers | e96e699 | 2007-05-08 00:34:18 -0700 | [diff] [blame] | 238 | #define atomic64_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new)) |
| 239 | #define atomic64_xchg(v, new) (xchg(&((v)->counter), new)) |
| 240 | |
| 241 | #define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new)) |
Ingo Molnar | ffbf670 | 2006-01-09 15:59:17 -0800 | [diff] [blame] | 242 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) |
Nick Piggin | 4a6dae6 | 2005-11-13 16:07:24 -0800 | [diff] [blame] | 243 | |
Mathieu Desnoyers | e96e699 | 2007-05-08 00:34:18 -0700 | [diff] [blame] | 244 | /** |
Arun Sharma | f24219b | 2011-07-26 16:09:07 -0700 | [diff] [blame] | 245 | * __atomic_add_unless - add unless the number is a given value |
Mathieu Desnoyers | e96e699 | 2007-05-08 00:34:18 -0700 | [diff] [blame] | 246 | * @v: pointer of type atomic_t |
| 247 | * @a: the amount to add to v... |
| 248 | * @u: ...unless v is equal to u. |
| 249 | * |
| 250 | * Atomically adds @a to @v, so long as it was not @u. |
Arun Sharma | f24219b | 2011-07-26 16:09:07 -0700 | [diff] [blame] | 251 | * Returns the old value of @v. |
Mathieu Desnoyers | e96e699 | 2007-05-08 00:34:18 -0700 | [diff] [blame] | 252 | */ |
Arun Sharma | f24219b | 2011-07-26 16:09:07 -0700 | [diff] [blame] | 253 | static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u) |
Mathieu Desnoyers | 2856f5e | 2007-05-08 00:34:38 -0700 | [diff] [blame] | 254 | { |
| 255 | int c, old; |
| 256 | c = atomic_read(v); |
| 257 | for (;;) { |
| 258 | if (unlikely(c == (u))) |
| 259 | break; |
| 260 | old = atomic_cmpxchg((v), c, c + (a)); |
| 261 | if (likely(old == c)) |
| 262 | break; |
| 263 | c = old; |
| 264 | } |
Arun Sharma | f24219b | 2011-07-26 16:09:07 -0700 | [diff] [blame] | 265 | return c; |
Mathieu Desnoyers | 2856f5e | 2007-05-08 00:34:38 -0700 | [diff] [blame] | 266 | } |
| 267 | |
Nick Piggin | 8426e1f | 2005-11-13 16:07:25 -0800 | [diff] [blame] | 268 | |
Mathieu Desnoyers | e96e699 | 2007-05-08 00:34:18 -0700 | [diff] [blame] | 269 | /** |
| 270 | * atomic64_add_unless - add unless the number is a given value |
| 271 | * @v: pointer of type atomic64_t |
| 272 | * @a: the amount to add to v... |
| 273 | * @u: ...unless v is equal to u. |
| 274 | * |
| 275 | * Atomically adds @a to @v, so long as it was not @u. |
Arun Sharma | f24219b | 2011-07-26 16:09:07 -0700 | [diff] [blame] | 276 | * Returns the old value of @v. |
Mathieu Desnoyers | e96e699 | 2007-05-08 00:34:18 -0700 | [diff] [blame] | 277 | */ |
Mathieu Desnoyers | 2856f5e | 2007-05-08 00:34:38 -0700 | [diff] [blame] | 278 | static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u) |
| 279 | { |
| 280 | long c, old; |
| 281 | c = atomic64_read(v); |
| 282 | for (;;) { |
| 283 | if (unlikely(c == (u))) |
| 284 | break; |
| 285 | old = atomic64_cmpxchg((v), c, c + (a)); |
| 286 | if (likely(old == c)) |
| 287 | break; |
| 288 | c = old; |
| 289 | } |
| 290 | return c != (u); |
| 291 | } |
| 292 | |
Mathieu Desnoyers | e96e699 | 2007-05-08 00:34:18 -0700 | [diff] [blame] | 293 | #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) |
| 294 | |
Hugh Dickins | 7c72aaf | 2005-11-23 13:37:40 -0800 | [diff] [blame] | 295 | #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0) |
| 296 | #define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0) |
| 297 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | #define atomic_dec_return(v) atomic_sub_return(1,(v)) |
| 299 | #define atomic64_dec_return(v) atomic64_sub_return(1,(v)) |
| 300 | |
| 301 | #define atomic_inc_return(v) atomic_add_return(1,(v)) |
| 302 | #define atomic64_inc_return(v) atomic64_add_return(1,(v)) |
| 303 | |
| 304 | #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0) |
| 305 | #define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0) |
| 306 | |
| 307 | #define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0) |
Hugh Dickins | 7c72aaf | 2005-11-23 13:37:40 -0800 | [diff] [blame] | 308 | #define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0) |
| 309 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0) |
| 311 | #define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0) |
| 312 | |
| 313 | #define atomic_inc(v) atomic_add(1,(v)) |
| 314 | #define atomic64_inc(v) atomic64_add(1,(v)) |
| 315 | |
| 316 | #define atomic_dec(v) atomic_sub(1,(v)) |
| 317 | #define atomic64_dec(v) atomic64_sub(1,(v)) |
| 318 | |
| 319 | #define smp_mb__before_atomic_dec() smp_mb() |
| 320 | #define smp_mb__after_atomic_dec() smp_mb() |
| 321 | #define smp_mb__before_atomic_inc() smp_mb() |
| 322 | #define smp_mb__after_atomic_inc() smp_mb() |
| 323 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | #endif /* _ALPHA_ATOMIC_H */ |