include/linux/spinlock_api_smp.h

   1 #ifndef __LINUX_SPINLOCK_API_SMP_H
   2 #define __LINUX_SPINLOCK_API_SMP_H
   3
   4 #ifndef __LINUX_INSIDE_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 #ifndef CONFIG_UNINLINE_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_PREEMPTION, 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         LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
 112         return flags;
 113 }
 114
 115 static inline void __raw_spin_lock_irq(raw_spinlock_t *lock)
 116 {
 117         local_irq_disable();
 118         preempt_disable();
 119         spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
 120         LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
 121 }
 122
 123 static inline void __raw_spin_lock_bh(raw_spinlock_t *lock)
 124 {
 125         __local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
 126         spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
 127         LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
 128 }
 129
 130 static inline void __raw_spin_lock(raw_spinlock_t *lock)
 131 {
 132         preempt_disable();
 133         spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
 134         LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
 135 }
 136
 137 #endif /* !CONFIG_GENERIC_LOCKBREAK || CONFIG_DEBUG_LOCK_ALLOC */
 138
 139 static inline void __raw_spin_unlock(raw_spinlock_t *lock)
 140 {
 141         spin_release(&lock->dep_map, _RET_IP_);
 142         do_raw_spin_unlock(lock);
 143         preempt_enable();
 144 }
 145
 146 static inline void __raw_spin_unlock_irqrestore(raw_spinlock_t *lock,
 147                                             unsigned long flags)
 148 {
 149         spin_release(&lock->dep_map, _RET_IP_);
 150         do_raw_spin_unlock(lock);
 151         local_irq_restore(flags);
 152         preempt_enable();
 153 }
 154
 155 static inline void __raw_spin_unlock_irq(raw_spinlock_t *lock)
 156 {
 157         spin_release(&lock->dep_map, _RET_IP_);
 158         do_raw_spin_unlock(lock);
 159         local_irq_enable();
 160         preempt_enable();
 161 }
 162
 163 static inline void __raw_spin_unlock_bh(raw_spinlock_t *lock)
 164 {
 165         spin_release(&lock->dep_map, _RET_IP_);
 166         do_raw_spin_unlock(lock);
 167         __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
 168 }
 169
 170 static inline int __raw_spin_trylock_bh(raw_spinlock_t *lock)
 171 {
 172         __local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
 173         if (do_raw_spin_trylock(lock)) {
 174                 spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
 175                 return 1;
 176         }
 177         __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
 178         return 0;
 179 }
 180
 181 /* PREEMPT_RT has its own rwlock implementation */
 182 #ifndef CONFIG_PREEMPT_RT
 183 #include <linux/rwlock_api_smp.h>
 184 #endif
 185
 186 #endif /* __LINUX_SPINLOCK_API_SMP_H */