include/linux/spinlock_api_smp.h

   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_raw_spin_locked(x)       BUG_ON(!raw_spin_is_locked(x))
  21
  22 void __lockfunc _spin_lock(raw_spinlock_t *lock)        __acquires(lock);
  23 void __lockfunc _spin_lock_nested(raw_spinlock_t *lock, int subclass)
  24                                                         __acquires(lock);
  25 void __lockfunc
  26 _spin_lock_nest_lock(raw_spinlock_t *lock, struct lockdep_map *map)
  27                                                         __acquires(lock);
  28 void __lockfunc _spin_lock_bh(raw_spinlock_t *lock)     __acquires(lock);
  29 void __lockfunc _spin_lock_irq(raw_spinlock_t *lock)    __acquires(lock);
  30
  31 unsigned long __lockfunc _spin_lock_irqsave(raw_spinlock_t *lock)
  32                                                         __acquires(lock);
  33 unsigned long __lockfunc
  34 _spin_lock_irqsave_nested(raw_spinlock_t *lock, int subclass)
  35                                                         __acquires(lock);
  36 int __lockfunc _spin_trylock(raw_spinlock_t *lock);
  37 int __lockfunc _spin_trylock_bh(raw_spinlock_t *lock);
  38 void __lockfunc _spin_unlock(raw_spinlock_t *lock)      __releases(lock);
  39 void __lockfunc _spin_unlock_bh(raw_spinlock_t *lock)   __releases(lock);
  40 void __lockfunc _spin_unlock_irq(raw_spinlock_t *lock)  __releases(lock);
  41 void __lockfunc
  42 _spin_unlock_irqrestore(raw_spinlock_t *lock, unsigned long flags)
  43                                                         __releases(lock);
  44
  45 #ifdef CONFIG_INLINE_SPIN_LOCK
  46 #define _spin_lock(lock) __spin_lock(lock)
  47 #endif
  48
  49 #ifdef CONFIG_INLINE_SPIN_LOCK_BH
  50 #define _spin_lock_bh(lock) __spin_lock_bh(lock)
  51 #endif
  52
  53 #ifdef CONFIG_INLINE_SPIN_LOCK_IRQ
  54 #define _spin_lock_irq(lock) __spin_lock_irq(lock)
  55 #endif
  56
  57 #ifdef CONFIG_INLINE_SPIN_LOCK_IRQSAVE
  58 #define _spin_lock_irqsave(lock) __spin_lock_irqsave(lock)
  59 #endif
  60
  61 #ifdef CONFIG_INLINE_SPIN_TRYLOCK
  62 #define _spin_trylock(lock) __spin_trylock(lock)
  63 #endif
  64
  65 #ifdef CONFIG_INLINE_SPIN_TRYLOCK_BH
  66 #define _spin_trylock_bh(lock) __spin_trylock_bh(lock)
  67 #endif
  68
  69 #ifdef CONFIG_INLINE_SPIN_UNLOCK
  70 #define _spin_unlock(lock) __spin_unlock(lock)
  71 #endif
  72
  73 #ifdef CONFIG_INLINE_SPIN_UNLOCK_BH
  74 #define _spin_unlock_bh(lock) __spin_unlock_bh(lock)
  75 #endif
  76
  77 #ifdef CONFIG_INLINE_SPIN_UNLOCK_IRQ
  78 #define _spin_unlock_irq(lock) __spin_unlock_irq(lock)
  79 #endif
  80
  81 #ifdef CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE
  82 #define _spin_unlock_irqrestore(lock, flags) __spin_unlock_irqrestore(lock, flags)
  83 #endif
  84
  85 static inline int __spin_trylock(raw_spinlock_t *lock)
  86 {
  87         preempt_disable();
  88         if (_raw_spin_trylock(lock)) {
  89                 spin_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 unsigned long __spin_lock_irqsave(raw_spinlock_t *lock)
 104 {
 105         unsigned long flags;
 106
 107         local_irq_save(flags);
 108         preempt_disable();
 109         spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
 110         /*
 111          * On lockdep we dont want the hand-coded irq-enable of
 112          * _raw_spin_lock_flags() code, because lockdep assumes
 113          * that interrupts are not re-enabled during lock-acquire:
 114          */
 115 #ifdef CONFIG_LOCKDEP
 116         LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
 117 #else
 118         _raw_spin_lock_flags(lock, &flags);
 119 #endif
 120         return flags;
 121 }
 122
 123 static inline void __spin_lock_irq(raw_spinlock_t *lock)
 124 {
 125         local_irq_disable();
 126         preempt_disable();
 127         spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
 128         LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
 129 }
 130
 131 static inline void __spin_lock_bh(raw_spinlock_t *lock)
 132 {
 133         local_bh_disable();
 134         preempt_disable();
 135         spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
 136         LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
 137 }
 138
 139 static inline void __spin_lock(raw_spinlock_t *lock)
 140 {
 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 #endif /* CONFIG_PREEMPT */
 147
 148 static inline void __spin_unlock(raw_spinlock_t *lock)
 149 {
 150         spin_release(&lock->dep_map, 1, _RET_IP_);
 151         _raw_spin_unlock(lock);
 152         preempt_enable();
 153 }
 154
 155 static inline void __spin_unlock_irqrestore(raw_spinlock_t *lock,
 156                                             unsigned long flags)
 157 {
 158         spin_release(&lock->dep_map, 1, _RET_IP_);
 159         _raw_spin_unlock(lock);
 160         local_irq_restore(flags);
 161         preempt_enable();
 162 }
 163
 164 static inline void __spin_unlock_irq(raw_spinlock_t *lock)
 165 {
 166         spin_release(&lock->dep_map, 1, _RET_IP_);
 167         _raw_spin_unlock(lock);
 168         local_irq_enable();
 169         preempt_enable();
 170 }
 171
 172 static inline void __spin_unlock_bh(raw_spinlock_t *lock)
 173 {
 174         spin_release(&lock->dep_map, 1, _RET_IP_);
 175         _raw_spin_unlock(lock);
 176         preempt_enable_no_resched();
 177         local_bh_enable_ip((unsigned long)__builtin_return_address(0));
 178 }
 179
 180 static inline int __spin_trylock_bh(raw_spinlock_t *lock)
 181 {
 182         local_bh_disable();
 183         preempt_disable();
 184         if (_raw_spin_trylock(lock)) {
 185                 spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
 186                 return 1;
 187         }
 188         preempt_enable_no_resched();
 189         local_bh_enable_ip((unsigned long)__builtin_return_address(0));
 190         return 0;
 191 }
 192
 193 #include <linux/rwlock_api_smp.h>
 194
 195 #endif /* __LINUX_SPINLOCK_API_SMP_H */