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
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 */
187