include/linux/rwlock_api_smp.h

   1 #ifndef __LINUX_RWLOCK_API_SMP_H
   2 #define __LINUX_RWLOCK_API_SMP_H
   3
   4 #ifndef __LINUX_SPINLOCK_API_SMP_H
   5 # error "Please do not include this file directly."
   6 #endif
   7
   8 /*
   9  * include/linux/rwlock_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 void __lockfunc _raw_read_lock(rwlock_t *lock)          __acquires(lock);
  19 void __lockfunc _raw_write_lock(rwlock_t *lock)         __acquires(lock);
  20 void __lockfunc _raw_write_lock_nested(rwlock_t *lock, int subclass)    __acquires(lock);
  21 void __lockfunc _raw_read_lock_bh(rwlock_t *lock)       __acquires(lock);
  22 void __lockfunc _raw_write_lock_bh(rwlock_t *lock)      __acquires(lock);
  23 void __lockfunc _raw_read_lock_irq(rwlock_t *lock)      __acquires(lock);
  24 void __lockfunc _raw_write_lock_irq(rwlock_t *lock)     __acquires(lock);
  25 unsigned long __lockfunc _raw_read_lock_irqsave(rwlock_t *lock)
  26                                                         __acquires(lock);
  27 unsigned long __lockfunc _raw_write_lock_irqsave(rwlock_t *lock)
  28                                                         __acquires(lock);
  29 int __lockfunc _raw_read_trylock(rwlock_t *lock);
  30 int __lockfunc _raw_write_trylock(rwlock_t *lock);
  31 void __lockfunc _raw_read_unlock(rwlock_t *lock)        __releases(lock);
  32 void __lockfunc _raw_write_unlock(rwlock_t *lock)       __releases(lock);
  33 void __lockfunc _raw_read_unlock_bh(rwlock_t *lock)     __releases(lock);
  34 void __lockfunc _raw_write_unlock_bh(rwlock_t *lock)    __releases(lock);
  35 void __lockfunc _raw_read_unlock_irq(rwlock_t *lock)    __releases(lock);
  36 void __lockfunc _raw_write_unlock_irq(rwlock_t *lock)   __releases(lock);
  37 void __lockfunc
  38 _raw_read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
  39                                                         __releases(lock);
  40 void __lockfunc
  41 _raw_write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
  42                                                         __releases(lock);
  43
  44 #ifdef CONFIG_INLINE_READ_LOCK
  45 #define _raw_read_lock(lock) __raw_read_lock(lock)
  46 #endif
  47
  48 #ifdef CONFIG_INLINE_WRITE_LOCK
  49 #define _raw_write_lock(lock) __raw_write_lock(lock)
  50 #endif
  51
  52 #ifdef CONFIG_INLINE_READ_LOCK_BH
  53 #define _raw_read_lock_bh(lock) __raw_read_lock_bh(lock)
  54 #endif
  55
  56 #ifdef CONFIG_INLINE_WRITE_LOCK_BH
  57 #define _raw_write_lock_bh(lock) __raw_write_lock_bh(lock)
  58 #endif
  59
  60 #ifdef CONFIG_INLINE_READ_LOCK_IRQ
  61 #define _raw_read_lock_irq(lock) __raw_read_lock_irq(lock)
  62 #endif
  63
  64 #ifdef CONFIG_INLINE_WRITE_LOCK_IRQ
  65 #define _raw_write_lock_irq(lock) __raw_write_lock_irq(lock)
  66 #endif
  67
  68 #ifdef CONFIG_INLINE_READ_LOCK_IRQSAVE
  69 #define _raw_read_lock_irqsave(lock) __raw_read_lock_irqsave(lock)
  70 #endif
  71
  72 #ifdef CONFIG_INLINE_WRITE_LOCK_IRQSAVE
  73 #define _raw_write_lock_irqsave(lock) __raw_write_lock_irqsave(lock)
  74 #endif
  75
  76 #ifdef CONFIG_INLINE_READ_TRYLOCK
  77 #define _raw_read_trylock(lock) __raw_read_trylock(lock)
  78 #endif
  79
  80 #ifdef CONFIG_INLINE_WRITE_TRYLOCK
  81 #define _raw_write_trylock(lock) __raw_write_trylock(lock)
  82 #endif
  83
  84 #ifdef CONFIG_INLINE_READ_UNLOCK
  85 #define _raw_read_unlock(lock) __raw_read_unlock(lock)
  86 #endif
  87
  88 #ifdef CONFIG_INLINE_WRITE_UNLOCK
  89 #define _raw_write_unlock(lock) __raw_write_unlock(lock)
  90 #endif
  91
  92 #ifdef CONFIG_INLINE_READ_UNLOCK_BH
  93 #define _raw_read_unlock_bh(lock) __raw_read_unlock_bh(lock)
  94 #endif
  95
  96 #ifdef CONFIG_INLINE_WRITE_UNLOCK_BH
  97 #define _raw_write_unlock_bh(lock) __raw_write_unlock_bh(lock)
  98 #endif
  99
 100 #ifdef CONFIG_INLINE_READ_UNLOCK_IRQ
 101 #define _raw_read_unlock_irq(lock) __raw_read_unlock_irq(lock)
 102 #endif
 103
 104 #ifdef CONFIG_INLINE_WRITE_UNLOCK_IRQ
 105 #define _raw_write_unlock_irq(lock) __raw_write_unlock_irq(lock)
 106 #endif
 107
 108 #ifdef CONFIG_INLINE_READ_UNLOCK_IRQRESTORE
 109 #define _raw_read_unlock_irqrestore(lock, flags) \
 110         __raw_read_unlock_irqrestore(lock, flags)
 111 #endif
 112
 113 #ifdef CONFIG_INLINE_WRITE_UNLOCK_IRQRESTORE
 114 #define _raw_write_unlock_irqrestore(lock, flags) \
 115         __raw_write_unlock_irqrestore(lock, flags)
 116 #endif
 117
 118 static inline int __raw_read_trylock(rwlock_t *lock)
 119 {
 120         preempt_disable();
 121         if (do_raw_read_trylock(lock)) {
 122                 rwlock_acquire_read(&lock->dep_map, 0, 1, _RET_IP_);
 123                 return 1;
 124         }
 125         preempt_enable();
 126         return 0;
 127 }
 128
 129 static inline int __raw_write_trylock(rwlock_t *lock)
 130 {
 131         preempt_disable();
 132         if (do_raw_write_trylock(lock)) {
 133                 rwlock_acquire(&lock->dep_map, 0, 1, _RET_IP_);
 134                 return 1;
 135         }
 136         preempt_enable();
 137         return 0;
 138 }
 139
 140 /*
 141  * If lockdep is enabled then we use the non-preemption spin-ops
 142  * even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
 143  * not re-enabled during lock-acquire (which the preempt-spin-ops do):
 144  */
 145 #if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)
 146
 147 static inline void __raw_read_lock(rwlock_t *lock)
 148 {
 149         preempt_disable();
 150         rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
 151         LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
 152 }
 153
 154 static inline unsigned long __raw_read_lock_irqsave(rwlock_t *lock)
 155 {
 156         unsigned long flags;
 157
 158         local_irq_save(flags);
 159         preempt_disable();
 160         rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
 161         LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
 162         return flags;
 163 }
 164
 165 static inline void __raw_read_lock_irq(rwlock_t *lock)
 166 {
 167         local_irq_disable();
 168         preempt_disable();
 169         rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
 170         LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
 171 }
 172
 173 static inline void __raw_read_lock_bh(rwlock_t *lock)
 174 {
 175         __local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
 176         rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
 177         LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
 178 }
 179
 180 static inline unsigned long __raw_write_lock_irqsave(rwlock_t *lock)
 181 {
 182         unsigned long flags;
 183
 184         local_irq_save(flags);
 185         preempt_disable();
 186         rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
 187         LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
 188         return flags;
 189 }
 190
 191 static inline void __raw_write_lock_irq(rwlock_t *lock)
 192 {
 193         local_irq_disable();
 194         preempt_disable();
 195         rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
 196         LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
 197 }
 198
 199 static inline void __raw_write_lock_bh(rwlock_t *lock)
 200 {
 201         __local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
 202         rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
 203         LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
 204 }
 205
 206 static inline void __raw_write_lock(rwlock_t *lock)
 207 {
 208         preempt_disable();
 209         rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
 210         LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
 211 }
 212
 213 static inline void __raw_write_lock_nested(rwlock_t *lock, int subclass)
 214 {
 215         preempt_disable();
 216         rwlock_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
 217         LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
 218 }
 219
 220 #endif /* !CONFIG_GENERIC_LOCKBREAK || CONFIG_DEBUG_LOCK_ALLOC */
 221
 222 static inline void __raw_write_unlock(rwlock_t *lock)
 223 {
 224         rwlock_release(&lock->dep_map, _RET_IP_);
 225         do_raw_write_unlock(lock);
 226         preempt_enable();
 227 }
 228
 229 static inline void __raw_read_unlock(rwlock_t *lock)
 230 {
 231         rwlock_release(&lock->dep_map, _RET_IP_);
 232         do_raw_read_unlock(lock);
 233         preempt_enable();
 234 }
 235
 236 static inline void
 237 __raw_read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
 238 {
 239         rwlock_release(&lock->dep_map, _RET_IP_);
 240         do_raw_read_unlock(lock);
 241         local_irq_restore(flags);
 242         preempt_enable();
 243 }
 244
 245 static inline void __raw_read_unlock_irq(rwlock_t *lock)
 246 {
 247         rwlock_release(&lock->dep_map, _RET_IP_);
 248         do_raw_read_unlock(lock);
 249         local_irq_enable();
 250         preempt_enable();
 251 }
 252
 253 static inline void __raw_read_unlock_bh(rwlock_t *lock)
 254 {
 255         rwlock_release(&lock->dep_map, _RET_IP_);
 256         do_raw_read_unlock(lock);
 257         __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
 258 }
 259
 260 static inline void __raw_write_unlock_irqrestore(rwlock_t *lock,
 261                                              unsigned long flags)
 262 {
 263         rwlock_release(&lock->dep_map, _RET_IP_);
 264         do_raw_write_unlock(lock);
 265         local_irq_restore(flags);
 266         preempt_enable();
 267 }
 268
 269 static inline void __raw_write_unlock_irq(rwlock_t *lock)
 270 {
 271         rwlock_release(&lock->dep_map, _RET_IP_);
 272         do_raw_write_unlock(lock);
 273         local_irq_enable();
 274         preempt_enable();
 275 }
 276
 277 static inline void __raw_write_unlock_bh(rwlock_t *lock)
 278 {
 279         rwlock_release(&lock->dep_map, _RET_IP_);
 280         do_raw_write_unlock(lock);
 281         __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
 282 }
 283
 284 #endif /* __LINUX_RWLOCK_API_SMP_H */