1 #ifndef __LINUX_SPINLOCK_API_SMP_H 2 #define __LINUX_SPINLOCK_API_SMP_H 3 4 #ifndef __LINUX_SPINLOCK_H 5 # error "please don't include this file directly" 6 #endif 7 8 /* 9 * include/linux/spinlock_api_smp.h 10 * 11 * spinlock API declarations on SMP (and debug) 12 * (implemented in kernel/spinlock.c) 13 * 14 * portions Copyright 2005, Red Hat, Inc., Ingo Molnar 15 * Released under the General Public License (GPL). 16 */ 17 18 int in_lock_functions(unsigned long addr); 19 20 #define assert_spin_locked(x) BUG_ON(!spin_is_locked(x)) 21 22 void __lockfunc _spin_lock(spinlock_t *lock) __acquires(lock); 23 void __lockfunc _spin_lock_nested(spinlock_t *lock, int subclass) 24 __acquires(lock); 25 void __lockfunc _spin_lock_nest_lock(spinlock_t *lock, struct lockdep_map *map) 26 __acquires(lock); 27 void __lockfunc _read_lock(rwlock_t *lock) __acquires(lock); 28 void __lockfunc _write_lock(rwlock_t *lock) __acquires(lock); 29 void __lockfunc _spin_lock_bh(spinlock_t *lock) __acquires(lock); 30 void __lockfunc _read_lock_bh(rwlock_t *lock) __acquires(lock); 31 void __lockfunc _write_lock_bh(rwlock_t *lock) __acquires(lock); 32 void __lockfunc _spin_lock_irq(spinlock_t *lock) __acquires(lock); 33 void __lockfunc _read_lock_irq(rwlock_t *lock) __acquires(lock); 34 void __lockfunc _write_lock_irq(rwlock_t *lock) __acquires(lock); 35 unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock) 36 __acquires(lock); 37 unsigned long __lockfunc _spin_lock_irqsave_nested(spinlock_t *lock, int subclass) 38 __acquires(lock); 39 unsigned long __lockfunc _read_lock_irqsave(rwlock_t *lock) 40 __acquires(lock); 41 unsigned long __lockfunc _write_lock_irqsave(rwlock_t *lock) 42 __acquires(lock); 43 int __lockfunc _spin_trylock(spinlock_t *lock); 44 int __lockfunc _read_trylock(rwlock_t *lock); 45 int __lockfunc _write_trylock(rwlock_t *lock); 46 int __lockfunc _spin_trylock_bh(spinlock_t *lock); 47 void __lockfunc _spin_unlock(spinlock_t *lock) __releases(lock); 48 void __lockfunc _read_unlock(rwlock_t *lock) __releases(lock); 49 void __lockfunc _write_unlock(rwlock_t *lock) __releases(lock); 50 void __lockfunc _spin_unlock_bh(spinlock_t *lock) __releases(lock); 51 void __lockfunc _read_unlock_bh(rwlock_t *lock) __releases(lock); 52 void __lockfunc _write_unlock_bh(rwlock_t *lock) __releases(lock); 53 void __lockfunc _spin_unlock_irq(spinlock_t *lock) __releases(lock); 54 void __lockfunc _read_unlock_irq(rwlock_t *lock) __releases(lock); 55 void __lockfunc _write_unlock_irq(rwlock_t *lock) __releases(lock); 56 void __lockfunc _spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags) 57 __releases(lock); 58 void __lockfunc _read_unlock_irqrestore(rwlock_t *lock, unsigned long flags) 59 __releases(lock); 60 void __lockfunc _write_unlock_irqrestore(rwlock_t *lock, unsigned long flags) 61 __releases(lock); 62 63 static inline int __spin_trylock(spinlock_t *lock) 64 { 65 preempt_disable(); 66 if (_raw_spin_trylock(lock)) { 67 spin_acquire(&lock->dep_map, 0, 1, _RET_IP_); 68 return 1; 69 } 70 preempt_enable(); 71 return 0; 72 } 73 74 static inline int __read_trylock(rwlock_t *lock) 75 { 76 preempt_disable(); 77 if (_raw_read_trylock(lock)) { 78 rwlock_acquire_read(&lock->dep_map, 0, 1, _RET_IP_); 79 return 1; 80 } 81 preempt_enable(); 82 return 0; 83 } 84 85 static inline int __write_trylock(rwlock_t *lock) 86 { 87 preempt_disable(); 88 if (_raw_write_trylock(lock)) { 89 rwlock_acquire(&lock->dep_map, 0, 1, _RET_IP_); 90 return 1; 91 } 92 preempt_enable(); 93 return 0; 94 } 95 96 /* 97 * If lockdep is enabled then we use the non-preemption spin-ops 98 * even on CONFIG_PREEMPT, because lockdep assumes that interrupts are 99 * not re-enabled during lock-acquire (which the preempt-spin-ops do): 100 */ 101 #if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC) 102 103 static inline void __read_lock(rwlock_t *lock) 104 { 105 preempt_disable(); 106 rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_); 107 LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock); 108 } 109 110 static inline unsigned long __spin_lock_irqsave(spinlock_t *lock) 111 { 112 unsigned long flags; 113 114 local_irq_save(flags); 115 preempt_disable(); 116 spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); 117 /* 118 * On lockdep we dont want the hand-coded irq-enable of 119 * _raw_spin_lock_flags() code, because lockdep assumes 120 * that interrupts are not re-enabled during lock-acquire: 121 */ 122 #ifdef CONFIG_LOCKDEP 123 LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock); 124 #else 125 _raw_spin_lock_flags(lock, &flags); 126 #endif 127 return flags; 128 } 129 130 static inline void __spin_lock_irq(spinlock_t *lock) 131 { 132 local_irq_disable(); 133 preempt_disable(); 134 spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); 135 LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock); 136 } 137 138 static inline void __spin_lock_bh(spinlock_t *lock) 139 { 140 local_bh_disable(); 141 preempt_disable(); 142 spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); 143 LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock); 144 } 145 146 static inline unsigned long __read_lock_irqsave(rwlock_t *lock) 147 { 148 unsigned long flags; 149 150 local_irq_save(flags); 151 preempt_disable(); 152 rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_); 153 LOCK_CONTENDED_FLAGS(lock, _raw_read_trylock, _raw_read_lock, 154 _raw_read_lock_flags, &flags); 155 return flags; 156 } 157 158 static inline void __read_lock_irq(rwlock_t *lock) 159 { 160 local_irq_disable(); 161 preempt_disable(); 162 rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_); 163 LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock); 164 } 165 166 static inline void __read_lock_bh(rwlock_t *lock) 167 { 168 local_bh_disable(); 169 preempt_disable(); 170 rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_); 171 LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock); 172 } 173 174 static inline unsigned long __write_lock_irqsave(rwlock_t *lock) 175 { 176 unsigned long flags; 177 178 local_irq_save(flags); 179 preempt_disable(); 180 rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_); 181 LOCK_CONTENDED_FLAGS(lock, _raw_write_trylock, _raw_write_lock, 182 _raw_write_lock_flags, &flags); 183 return flags; 184 } 185 186 static inline void __write_lock_irq(rwlock_t *lock) 187 { 188 local_irq_disable(); 189 preempt_disable(); 190 rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_); 191 LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock); 192 } 193 194 static inline void __write_lock_bh(rwlock_t *lock) 195 { 196 local_bh_disable(); 197 preempt_disable(); 198 rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_); 199 LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock); 200 } 201 202 static inline void __spin_lock(spinlock_t *lock) 203 { 204 preempt_disable(); 205 spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); 206 LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock); 207 } 208 209 static inline void __write_lock(rwlock_t *lock) 210 { 211 preempt_disable(); 212 rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_); 213 LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock); 214 } 215 216 #endif /* CONFIG_PREEMPT */ 217 218 static inline void __spin_unlock(spinlock_t *lock) 219 { 220 spin_release(&lock->dep_map, 1, _RET_IP_); 221 _raw_spin_unlock(lock); 222 preempt_enable(); 223 } 224 225 static inline void __write_unlock(rwlock_t *lock) 226 { 227 rwlock_release(&lock->dep_map, 1, _RET_IP_); 228 _raw_write_unlock(lock); 229 preempt_enable(); 230 } 231 232 static inline void __read_unlock(rwlock_t *lock) 233 { 234 rwlock_release(&lock->dep_map, 1, _RET_IP_); 235 _raw_read_unlock(lock); 236 preempt_enable(); 237 } 238 239 static inline void __spin_unlock_irqrestore(spinlock_t *lock, 240 unsigned long flags) 241 { 242 spin_release(&lock->dep_map, 1, _RET_IP_); 243 _raw_spin_unlock(lock); 244 local_irq_restore(flags); 245 preempt_enable(); 246 } 247 248 static inline void __spin_unlock_irq(spinlock_t *lock) 249 { 250 spin_release(&lock->dep_map, 1, _RET_IP_); 251 _raw_spin_unlock(lock); 252 local_irq_enable(); 253 preempt_enable(); 254 } 255 256 static inline void __spin_unlock_bh(spinlock_t *lock) 257 { 258 spin_release(&lock->dep_map, 1, _RET_IP_); 259 _raw_spin_unlock(lock); 260 preempt_enable_no_resched(); 261 local_bh_enable_ip((unsigned long)__builtin_return_address(0)); 262 } 263 264 static inline void __read_unlock_irqrestore(rwlock_t *lock, unsigned long flags) 265 { 266 rwlock_release(&lock->dep_map, 1, _RET_IP_); 267 _raw_read_unlock(lock); 268 local_irq_restore(flags); 269 preempt_enable(); 270 } 271 272 static inline void __read_unlock_irq(rwlock_t *lock) 273 { 274 rwlock_release(&lock->dep_map, 1, _RET_IP_); 275 _raw_read_unlock(lock); 276 local_irq_enable(); 277 preempt_enable(); 278 } 279 280 static inline void __read_unlock_bh(rwlock_t *lock) 281 { 282 rwlock_release(&lock->dep_map, 1, _RET_IP_); 283 _raw_read_unlock(lock); 284 preempt_enable_no_resched(); 285 local_bh_enable_ip((unsigned long)__builtin_return_address(0)); 286 } 287 288 static inline void __write_unlock_irqrestore(rwlock_t *lock, 289 unsigned long flags) 290 { 291 rwlock_release(&lock->dep_map, 1, _RET_IP_); 292 _raw_write_unlock(lock); 293 local_irq_restore(flags); 294 preempt_enable(); 295 } 296 297 static inline void __write_unlock_irq(rwlock_t *lock) 298 { 299 rwlock_release(&lock->dep_map, 1, _RET_IP_); 300 _raw_write_unlock(lock); 301 local_irq_enable(); 302 preempt_enable(); 303 } 304 305 static inline void __write_unlock_bh(rwlock_t *lock) 306 { 307 rwlock_release(&lock->dep_map, 1, _RET_IP_); 308 _raw_write_unlock(lock); 309 preempt_enable_no_resched(); 310 local_bh_enable_ip((unsigned long)__builtin_return_address(0)); 311 } 312 313 static inline int __spin_trylock_bh(spinlock_t *lock) 314 { 315 local_bh_disable(); 316 preempt_disable(); 317 if (_raw_spin_trylock(lock)) { 318 spin_acquire(&lock->dep_map, 0, 1, _RET_IP_); 319 return 1; 320 } 321 preempt_enable_no_resched(); 322 local_bh_enable_ip((unsigned long)__builtin_return_address(0)); 323 return 0; 324 } 325 326 #endif /* __LINUX_SPINLOCK_API_SMP_H */ 327