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