1#ifndef __LINUX_RWLOCK_API_SMP_H
2#define __LINUX_RWLOCK_API_SMP_H
3
4#ifndef __LINUX_SPINLOCK_API_SMP_H
5# error "please don't include this file directly"
6#endif
7
8/*
9 * include/linux/rwlock_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
18void __lockfunc _raw_read_lock(rwlock_t *lock)		__acquires(lock);
19void __lockfunc _raw_write_lock(rwlock_t *lock)		__acquires(lock);
20void __lockfunc _raw_write_lock_nested(rwlock_t *lock, int subclass)	__acquires(lock);
21void __lockfunc _raw_read_lock_bh(rwlock_t *lock)	__acquires(lock);
22void __lockfunc _raw_write_lock_bh(rwlock_t *lock)	__acquires(lock);
23void __lockfunc _raw_read_lock_irq(rwlock_t *lock)	__acquires(lock);
24void __lockfunc _raw_write_lock_irq(rwlock_t *lock)	__acquires(lock);
25unsigned long __lockfunc _raw_read_lock_irqsave(rwlock_t *lock)
26							__acquires(lock);
27unsigned long __lockfunc _raw_write_lock_irqsave(rwlock_t *lock)
28							__acquires(lock);
29int __lockfunc _raw_read_trylock(rwlock_t *lock);
30int __lockfunc _raw_write_trylock(rwlock_t *lock);
31void __lockfunc _raw_read_unlock(rwlock_t *lock)	__releases(lock);
32void __lockfunc _raw_write_unlock(rwlock_t *lock)	__releases(lock);
33void __lockfunc _raw_read_unlock_bh(rwlock_t *lock)	__releases(lock);
34void __lockfunc _raw_write_unlock_bh(rwlock_t *lock)	__releases(lock);
35void __lockfunc _raw_read_unlock_irq(rwlock_t *lock)	__releases(lock);
36void __lockfunc _raw_write_unlock_irq(rwlock_t *lock)	__releases(lock);
37void __lockfunc
38_raw_read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
39							__releases(lock);
40void __lockfunc
41_raw_write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
42							__releases(lock);
43
44#ifdef CONFIG_INLINE_READ_LOCK
45#define _raw_read_lock(lock) __raw_read_lock(lock)
46#endif
47
48#ifdef CONFIG_INLINE_WRITE_LOCK
49#define _raw_write_lock(lock) __raw_write_lock(lock)
50#endif
51
52#ifdef CONFIG_INLINE_READ_LOCK_BH
53#define _raw_read_lock_bh(lock) __raw_read_lock_bh(lock)
54#endif
55
56#ifdef CONFIG_INLINE_WRITE_LOCK_BH
57#define _raw_write_lock_bh(lock) __raw_write_lock_bh(lock)
58#endif
59
60#ifdef CONFIG_INLINE_READ_LOCK_IRQ
61#define _raw_read_lock_irq(lock) __raw_read_lock_irq(lock)
62#endif
63
64#ifdef CONFIG_INLINE_WRITE_LOCK_IRQ
65#define _raw_write_lock_irq(lock) __raw_write_lock_irq(lock)
66#endif
67
68#ifdef CONFIG_INLINE_READ_LOCK_IRQSAVE
69#define _raw_read_lock_irqsave(lock) __raw_read_lock_irqsave(lock)
70#endif
71
72#ifdef CONFIG_INLINE_WRITE_LOCK_IRQSAVE
73#define _raw_write_lock_irqsave(lock) __raw_write_lock_irqsave(lock)
74#endif
75
76#ifdef CONFIG_INLINE_READ_TRYLOCK
77#define _raw_read_trylock(lock) __raw_read_trylock(lock)
78#endif
79
80#ifdef CONFIG_INLINE_WRITE_TRYLOCK
81#define _raw_write_trylock(lock) __raw_write_trylock(lock)
82#endif
83
84#ifdef CONFIG_INLINE_READ_UNLOCK
85#define _raw_read_unlock(lock) __raw_read_unlock(lock)
86#endif
87
88#ifdef CONFIG_INLINE_WRITE_UNLOCK
89#define _raw_write_unlock(lock) __raw_write_unlock(lock)
90#endif
91
92#ifdef CONFIG_INLINE_READ_UNLOCK_BH
93#define _raw_read_unlock_bh(lock) __raw_read_unlock_bh(lock)
94#endif
95
96#ifdef CONFIG_INLINE_WRITE_UNLOCK_BH
97#define _raw_write_unlock_bh(lock) __raw_write_unlock_bh(lock)
98#endif
99
100#ifdef CONFIG_INLINE_READ_UNLOCK_IRQ
101#define _raw_read_unlock_irq(lock) __raw_read_unlock_irq(lock)
102#endif
103
104#ifdef CONFIG_INLINE_WRITE_UNLOCK_IRQ
105#define _raw_write_unlock_irq(lock) __raw_write_unlock_irq(lock)
106#endif
107
108#ifdef CONFIG_INLINE_READ_UNLOCK_IRQRESTORE
109#define _raw_read_unlock_irqrestore(lock, flags) \
110	__raw_read_unlock_irqrestore(lock, flags)
111#endif
112
113#ifdef CONFIG_INLINE_WRITE_UNLOCK_IRQRESTORE
114#define _raw_write_unlock_irqrestore(lock, flags) \
115	__raw_write_unlock_irqrestore(lock, flags)
116#endif
117
118static inline int __raw_read_trylock(rwlock_t *lock)
119{
120	preempt_disable();
121	if (do_raw_read_trylock(lock)) {
122		rwlock_acquire_read(&lock->dep_map, 0, 1, _RET_IP_);
123		return 1;
124	}
125	preempt_enable();
126	return 0;
127}
128
129static inline int __raw_write_trylock(rwlock_t *lock)
130{
131	preempt_disable();
132	if (do_raw_write_trylock(lock)) {
133		rwlock_acquire(&lock->dep_map, 0, 1, _RET_IP_);
134		return 1;
135	}
136	preempt_enable();
137	return 0;
138}
139
140/*
141 * If lockdep is enabled then we use the non-preemption spin-ops
142 * even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
143 * not re-enabled during lock-acquire (which the preempt-spin-ops do):
144 */
145#if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)
146
147static inline void __raw_read_lock(rwlock_t *lock)
148{
149	preempt_disable();
150	rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
151	LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
152}
153
154static inline unsigned long __raw_read_lock_irqsave(rwlock_t *lock)
155{
156	unsigned long flags;
157
158	local_irq_save(flags);
159	preempt_disable();
160	rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
161	LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
162	return flags;
163}
164
165static inline void __raw_read_lock_irq(rwlock_t *lock)
166{
167	local_irq_disable();
168	preempt_disable();
169	rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
170	LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
171}
172
173static inline void __raw_read_lock_bh(rwlock_t *lock)
174{
175	__local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
176	rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
177	LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
178}
179
180static inline unsigned long __raw_write_lock_irqsave(rwlock_t *lock)
181{
182	unsigned long flags;
183
184	local_irq_save(flags);
185	preempt_disable();
186	rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
187	LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
188	return flags;
189}
190
191static inline void __raw_write_lock_irq(rwlock_t *lock)
192{
193	local_irq_disable();
194	preempt_disable();
195	rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
196	LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
197}
198
199static inline void __raw_write_lock_bh(rwlock_t *lock)
200{
201	__local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
202	rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
203	LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
204}
205
206static inline void __raw_write_lock(rwlock_t *lock)
207{
208	preempt_disable();
209	rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
210	LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
211}
212
213static inline void __raw_write_lock_nested(rwlock_t *lock, int subclass)
214{
215	preempt_disable();
216	rwlock_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
217	LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
218}
219
220#endif /* !CONFIG_GENERIC_LOCKBREAK || CONFIG_DEBUG_LOCK_ALLOC */
221
222static inline void __raw_write_unlock(rwlock_t *lock)
223{
224	rwlock_release(&lock->dep_map, _RET_IP_);
225	do_raw_write_unlock(lock);
226	preempt_enable();
227}
228
229static inline void __raw_read_unlock(rwlock_t *lock)
230{
231	rwlock_release(&lock->dep_map, _RET_IP_);
232	do_raw_read_unlock(lock);
233	preempt_enable();
234}
235
236static inline void
237__raw_read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
238{
239	rwlock_release(&lock->dep_map, _RET_IP_);
240	do_raw_read_unlock(lock);
241	local_irq_restore(flags);
242	preempt_enable();
243}
244
245static inline void __raw_read_unlock_irq(rwlock_t *lock)
246{
247	rwlock_release(&lock->dep_map, _RET_IP_);
248	do_raw_read_unlock(lock);
249	local_irq_enable();
250	preempt_enable();
251}
252
253static inline void __raw_read_unlock_bh(rwlock_t *lock)
254{
255	rwlock_release(&lock->dep_map, _RET_IP_);
256	do_raw_read_unlock(lock);
257	__local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
258}
259
260static inline void __raw_write_unlock_irqrestore(rwlock_t *lock,
261					     unsigned long flags)
262{
263	rwlock_release(&lock->dep_map, _RET_IP_);
264	do_raw_write_unlock(lock);
265	local_irq_restore(flags);
266	preempt_enable();
267}
268
269static inline void __raw_write_unlock_irq(rwlock_t *lock)
270{
271	rwlock_release(&lock->dep_map, _RET_IP_);
272	do_raw_write_unlock(lock);
273	local_irq_enable();
274	preempt_enable();
275}
276
277static inline void __raw_write_unlock_bh(rwlock_t *lock)
278{
279	rwlock_release(&lock->dep_map, _RET_IP_);
280	do_raw_write_unlock(lock);
281	__local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
282}
283
284#endif /* __LINUX_RWLOCK_API_SMP_H */
285