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 _raw_spin_lock_bh_nested(raw_spinlock_t *lock, int subclass)
26								__acquires(lock);
27void __lockfunc
28_raw_spin_lock_nest_lock(raw_spinlock_t *lock, struct lockdep_map *map)
29								__acquires(lock);
30void __lockfunc _raw_spin_lock_bh(raw_spinlock_t *lock)		__acquires(lock);
31void __lockfunc _raw_spin_lock_irq(raw_spinlock_t *lock)
32								__acquires(lock);
33
34unsigned long __lockfunc _raw_spin_lock_irqsave(raw_spinlock_t *lock)
35								__acquires(lock);
36unsigned long __lockfunc
37_raw_spin_lock_irqsave_nested(raw_spinlock_t *lock, int subclass)
38								__acquires(lock);
39int __lockfunc _raw_spin_trylock(raw_spinlock_t *lock);
40int __lockfunc _raw_spin_trylock_bh(raw_spinlock_t *lock);
41void __lockfunc _raw_spin_unlock(raw_spinlock_t *lock)		__releases(lock);
42void __lockfunc _raw_spin_unlock_bh(raw_spinlock_t *lock)	__releases(lock);
43void __lockfunc _raw_spin_unlock_irq(raw_spinlock_t *lock)	__releases(lock);
44void __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
88static 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
106static 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
126static 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
134static 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
141static 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
150static 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
157static 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
166static 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
174static 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
181static 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 */
195