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 #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                 dbg_snapshot_spinlock(lock, 1);
  91                 spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
  92                 dbg_snapshot_spinlock(lock, 2);
  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         dbg_snapshot_spinlock(lock, 1);
 113         spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
 114         /*
 115          * On lockdep we dont want the hand-coded irq-enable of
 116          * do_raw_spin_lock_flags() code, because lockdep assumes
 117          * that interrupts are not re-enabled during lock-acquire:
 118          */
 119 #ifdef CONFIG_LOCKDEP
 120         LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
 121 #else
 122         do_raw_spin_lock_flags(lock, &flags);
 123 #endif
 124         dbg_snapshot_spinlock(lock, 2);
 125         return flags;
 126 }
 127
 128 static inline void __raw_spin_lock_irq(raw_spinlock_t *lock)
 129 {
 130         local_irq_disable();
 131         preempt_disable();
 132         dbg_snapshot_spinlock(lock, 1);
 133         spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
 134         LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
 135         dbg_snapshot_spinlock(lock, 2);
 136 }
 137
 138 static inline void __raw_spin_lock_bh(raw_spinlock_t *lock)
 139 {
 140         __local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
 141         spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
 142         LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
 143 }
 144
 145 static inline void __raw_spin_lock(raw_spinlock_t *lock)
 146 {
 147         preempt_disable();
 148         dbg_snapshot_spinlock(lock, 1);
 149         spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
 150         LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
 151         dbg_snapshot_spinlock(lock, 2);
 152 }
 153
 154 #endif /* !CONFIG_GENERIC_LOCKBREAK || CONFIG_DEBUG_LOCK_ALLOC */
 155
 156 static inline void __raw_spin_unlock(raw_spinlock_t *lock)
 157 {
 158         spin_release(&lock->dep_map, 1, _RET_IP_);
 159         dbg_snapshot_spinlock(lock, 3);
 160         do_raw_spin_unlock(lock);
 161         preempt_enable();
 162 }
 163
 164 static inline void __raw_spin_unlock_irqrestore(raw_spinlock_t *lock,
 165                                             unsigned long flags)
 166 {
 167         spin_release(&lock->dep_map, 1, _RET_IP_);
 168         do_raw_spin_unlock(lock);
 169         dbg_snapshot_spinlock(lock, 3);
 170         local_irq_restore(flags);
 171         preempt_enable();
 172 }
 173
 174 static inline void __raw_spin_unlock_irq(raw_spinlock_t *lock)
 175 {
 176         spin_release(&lock->dep_map, 1, _RET_IP_);
 177         do_raw_spin_unlock(lock);
 178         dbg_snapshot_spinlock(lock, 3);
 179         local_irq_enable();
 180         preempt_enable();
 181 }
 182
 183 static inline void __raw_spin_unlock_bh(raw_spinlock_t *lock)
 184 {
 185         spin_release(&lock->dep_map, 1, _RET_IP_);
 186         do_raw_spin_unlock(lock);
 187         __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
 188 }
 189
 190 static inline int __raw_spin_trylock_bh(raw_spinlock_t *lock)
 191 {
 192         __local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
 193         if (do_raw_spin_trylock(lock)) {
 194                 spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
 195                 return 1;
 196         }
 197         __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
 198         return 0;
 199 }
 200
 201 #include <linux/rwlock_api_smp.h>
 202
 203 #endif /* __LINUX_SPINLOCK_API_SMP_H */