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 do not 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