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 _raw_spin_lock(raw_spinlock_t *lock)            __acquires(lock);
  23 void __lockfunc _raw_spin_lock_nested(raw_spinlock_t *lock, int subclass)
  24                                                                 __acquires(lock);
  25 void __lockfunc
  26 _raw_spin_lock_nest_lock(raw_spinlock_t *lock, struct lockdep_map *map)
  27                                                                 __acquires(lock);
  28 void __lockfunc _raw_spin_lock_bh(raw_spinlock_t *lock)         __acquires(lock);
  29 void __lockfunc _raw_spin_lock_irq(raw_spinlock_t *lock)
  30                                                                 __acquires(lock);
  31
  32 unsigned long __lockfunc _raw_spin_lock_irqsave(raw_spinlock_t *lock)
  33                                                                 __acquires(lock);
  34 unsigned long __lockfunc
  35 _raw_spin_lock_irqsave_nested(raw_spinlock_t *lock, int subclass)
  36                                                                 __acquires(lock);
  37 int __lockfunc _raw_spin_trylock(raw_spinlock_t *lock);
  38 int __lockfunc _raw_spin_trylock_bh(raw_spinlock_t *lock);
  39 void __lockfunc _raw_spin_unlock(raw_spinlock_t *lock)          __releases(lock);
  40 void __lockfunc _raw_spin_unlock_bh(raw_spinlock_t *lock)       __releases(lock);
  41 void __lockfunc _raw_spin_unlock_irq(raw_spinlock_t *lock)      __releases(lock);
  42 void __lockfunc
  43 _raw_spin_unlock_irqrestore(raw_spinlock_t *lock, unsigned long flags)
  44                                                                 __releases(lock);
  45
  46 #ifdef CONFIG_INLINE_SPIN_LOCK
  47 #define _raw_spin_lock(lock) __raw_spin_lock(lock)
  48 #endif
  49
  50 #ifdef CONFIG_INLINE_SPIN_LOCK_BH
  51 #define _raw_spin_lock_bh(lock) __raw_spin_lock_bh(lock)
  52 #endif
  53
  54 #ifdef CONFIG_INLINE_SPIN_LOCK_IRQ
  55 #define _raw_spin_lock_irq(lock) __raw_spin_lock_irq(lock)
  56 #endif
  57
  58 #ifdef CONFIG_INLINE_SPIN_LOCK_IRQSAVE
  59 #define _raw_spin_lock_irqsave(lock) __raw_spin_lock_irqsave(lock)
  60 #endif
  61
  62 #ifdef CONFIG_INLINE_SPIN_TRYLOCK
  63 #define _raw_spin_trylock(lock) __raw_spin_trylock(lock)
  64 #endif
  65
  66 #ifdef CONFIG_INLINE_SPIN_TRYLOCK_BH
  67 #define _raw_spin_trylock_bh(lock) __raw_spin_trylock_bh(lock)
  68 #endif
  69
  70 #ifdef CONFIG_INLINE_SPIN_UNLOCK
  71 #define _raw_spin_unlock(lock) __raw_spin_unlock(lock)
  72 #endif
  73
  74 #ifdef CONFIG_INLINE_SPIN_UNLOCK_BH
  75 #define _raw_spin_unlock_bh(lock) __raw_spin_unlock_bh(lock)
  76 #endif
  77
  78 #ifdef CONFIG_INLINE_SPIN_UNLOCK_IRQ
  79 #define _raw_spin_unlock_irq(lock) __raw_spin_unlock_irq(lock)
  80 #endif
  81
  82 #ifdef CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE
  83 #define _raw_spin_unlock_irqrestore(lock, flags) __raw_spin_unlock_irqrestore(lock, flags)
  84 #endif
  85
  86 static inline int __raw_spin_trylock(raw_spinlock_t *lock)
  87 {
  88         preempt_disable();
  89         if (do_raw_spin_trylock(lock)) {
  90                 spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
  91                 return 1;
  92         }
  93         preempt_enable();
  94         return 0;
  95 }
  96
  97 /*
  98  * If lockdep is enabled then we use the non-preemption spin-ops
  99  * even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
 100  * not re-enabled during lock-acquire (which the preempt-spin-ops do):
 101  */
 102 #if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)
 103
 104 static inline unsigned long __raw_spin_lock_irqsave(raw_spinlock_t *lock)
 105 {
 106         unsigned long flags;
 107
 108         local_irq_save(flags);
 109         preempt_disable();
 110         spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
 111         /*
 112          * On lockdep we dont want the hand-coded irq-enable of
 113          * do_raw_spin_lock_flags() code, because lockdep assumes
 114          * that interrupts are not re-enabled during lock-acquire:
 115          */
 116 #ifdef CONFIG_LOCKDEP
 117         LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
 118 #else
 119         do_raw_spin_lock_flags(lock, &flags);
 120 #endif
 121         return flags;
 122 }
 123
 124 static inline void __raw_spin_lock_irq(raw_spinlock_t *lock)
 125 {
 126         local_irq_disable();
 127         preempt_disable();
 128         spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
 129         LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
 130 }
 131
 132 static inline void __raw_spin_lock_bh(raw_spinlock_t *lock)
 133 {
 134         local_bh_disable();
 135         preempt_disable();
 136         spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
 137         LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
 138 }
 139
 140 static inline void __raw_spin_lock(raw_spinlock_t *lock)
 141 {
 142         preempt_disable();
 143         spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
 144         LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
 145 }
 146
 147 #endif /* CONFIG_PREEMPT */
 148
 149 static inline void __raw_spin_unlock(raw_spinlock_t *lock)
 150 {
 151         spin_release(&lock->dep_map, 1, _RET_IP_);
 152         do_raw_spin_unlock(lock);
 153         preempt_enable();
 154 }
 155
 156 static inline void __raw_spin_unlock_irqrestore(raw_spinlock_t *lock,
 157                                             unsigned long flags)
 158 {
 159         spin_release(&lock->dep_map, 1, _RET_IP_);
 160         do_raw_spin_unlock(lock);
 161         local_irq_restore(flags);
 162         preempt_enable();
 163 }
 164
 165 static inline void __raw_spin_unlock_irq(raw_spinlock_t *lock)
 166 {
 167         spin_release(&lock->dep_map, 1, _RET_IP_);
 168         do_raw_spin_unlock(lock);
 169         local_irq_enable();
 170         preempt_enable();
 171 }
 172
 173 static inline void __raw_spin_unlock_bh(raw_spinlock_t *lock)
 174 {
 175         spin_release(&lock->dep_map, 1, _RET_IP_);
 176         do_raw_spin_unlock(lock);
 177         preempt_enable_no_resched();
 178         local_bh_enable_ip((unsigned long)__builtin_return_address(0));
 179 }
 180
 181 static inline int __raw_spin_trylock_bh(raw_spinlock_t *lock)
 182 {
 183         local_bh_disable();
 184         preempt_disable();
 185         if (do_raw_spin_trylock(lock)) {
 186                 spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
 187                 return 1;
 188         }
 189         preempt_enable_no_resched();
 190         local_bh_enable_ip((unsigned long)__builtin_return_address(0));
 191         return 0;
 192 }
 193
 194 #include <linux/rwlock_api_smp.h>
 195
 196 #endif /* __LINUX_SPINLOCK_API_SMP_H */