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 do not 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
 18int in_lock_functions(unsigned long addr);
 19
 20#define assert_raw_spin_locked(x)	BUG_ON(!raw_spin_is_locked(x))
 21
 22void __lockfunc _raw_spin_lock(raw_spinlock_t *lock)		__acquires(lock);
 23void __lockfunc _raw_spin_lock_nested(raw_spinlock_t *lock, int subclass)
 24								__acquires(lock);
 25void __lockfunc
 26_raw_spin_lock_nest_lock(raw_spinlock_t *lock, struct lockdep_map *map)
 27								__acquires(lock);
 28void __lockfunc _raw_spin_lock_bh(raw_spinlock_t *lock)		__acquires(lock);
 29void __lockfunc _raw_spin_lock_irq(raw_spinlock_t *lock)
 30								__acquires(lock);
 31
 32unsigned long __lockfunc _raw_spin_lock_irqsave(raw_spinlock_t *lock)
 33								__acquires(lock);
 34unsigned long __lockfunc
 35_raw_spin_lock_irqsave_nested(raw_spinlock_t *lock, int subclass)
 36								__acquires(lock);
 37int __lockfunc _raw_spin_trylock(raw_spinlock_t *lock);
 38int __lockfunc _raw_spin_trylock_bh(raw_spinlock_t *lock);
 39void __lockfunc _raw_spin_unlock(raw_spinlock_t *lock)		__releases(lock);
 40void __lockfunc _raw_spin_unlock_bh(raw_spinlock_t *lock)	__releases(lock);
 41void __lockfunc _raw_spin_unlock_irq(raw_spinlock_t *lock)	__releases(lock);
 42void __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
 86static 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
104static 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
115static 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
123static 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
130static 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
139static 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
146static 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
155static 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
163static 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
170static 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 */