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