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
18 void __lockfunc _raw_read_lock(rwlock_t *lock) __acquires(lock);
19 void __lockfunc _raw_write_lock(rwlock_t *lock) __acquires(lock);
20 void __lockfunc _raw_read_lock_bh(rwlock_t *lock) __acquires(lock);
21 void __lockfunc _raw_write_lock_bh(rwlock_t *lock) __acquires(lock);
22 void __lockfunc _raw_read_lock_irq(rwlock_t *lock) __acquires(lock);
23 void __lockfunc _raw_write_lock_irq(rwlock_t *lock) __acquires(lock);
24 unsigned long __lockfunc _raw_read_lock_irqsave(rwlock_t *lock)
25 __acquires(lock);
26 unsigned long __lockfunc _raw_write_lock_irqsave(rwlock_t *lock)
27 __acquires(lock);
28 int __lockfunc _raw_read_trylock(rwlock_t *lock);
29 int __lockfunc _raw_write_trylock(rwlock_t *lock);
30 void __lockfunc _raw_read_unlock(rwlock_t *lock) __releases(lock);
31 void __lockfunc _raw_write_unlock(rwlock_t *lock) __releases(lock);
32 void __lockfunc _raw_read_unlock_bh(rwlock_t *lock) __releases(lock);
33 void __lockfunc _raw_write_unlock_bh(rwlock_t *lock) __releases(lock);
34 void __lockfunc _raw_read_unlock_irq(rwlock_t *lock) __releases(lock);
35 void __lockfunc _raw_write_unlock_irq(rwlock_t *lock) __releases(lock);
36 void __lockfunc
37 _raw_read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
38 __releases(lock);
39 void __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
__raw_read_trylock(rwlock_t * lock)117 static 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
__raw_write_trylock(rwlock_t * lock)128 static 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
__raw_read_lock(rwlock_t * lock)146 static 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
__raw_read_lock_irqsave(rwlock_t * lock)153 static 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
__raw_read_lock_irq(rwlock_t * lock)165 static 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
__raw_read_lock_bh(rwlock_t * lock)173 static 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
__raw_write_lock_irqsave(rwlock_t * lock)180 static 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
__raw_write_lock_irq(rwlock_t * lock)192 static 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
__raw_write_lock_bh(rwlock_t * lock)200 static 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
__raw_write_lock(rwlock_t * lock)207 static 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
__raw_write_unlock(rwlock_t * lock)216 static inline void __raw_write_unlock(rwlock_t *lock)
217 {
218 rwlock_release(&lock->dep_map, _RET_IP_);
219 do_raw_write_unlock(lock);
220 preempt_enable();
221 }
222
__raw_read_unlock(rwlock_t * lock)223 static inline void __raw_read_unlock(rwlock_t *lock)
224 {
225 rwlock_release(&lock->dep_map, _RET_IP_);
226 do_raw_read_unlock(lock);
227 preempt_enable();
228 }
229
230 static inline void
__raw_read_unlock_irqrestore(rwlock_t * lock,unsigned long flags)231 __raw_read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
232 {
233 rwlock_release(&lock->dep_map, _RET_IP_);
234 do_raw_read_unlock(lock);
235 local_irq_restore(flags);
236 preempt_enable();
237 }
238
__raw_read_unlock_irq(rwlock_t * lock)239 static inline void __raw_read_unlock_irq(rwlock_t *lock)
240 {
241 rwlock_release(&lock->dep_map, _RET_IP_);
242 do_raw_read_unlock(lock);
243 local_irq_enable();
244 preempt_enable();
245 }
246
__raw_read_unlock_bh(rwlock_t * lock)247 static inline void __raw_read_unlock_bh(rwlock_t *lock)
248 {
249 rwlock_release(&lock->dep_map, _RET_IP_);
250 do_raw_read_unlock(lock);
251 __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
252 }
253
__raw_write_unlock_irqrestore(rwlock_t * lock,unsigned long flags)254 static inline void __raw_write_unlock_irqrestore(rwlock_t *lock,
255 unsigned long flags)
256 {
257 rwlock_release(&lock->dep_map, _RET_IP_);
258 do_raw_write_unlock(lock);
259 local_irq_restore(flags);
260 preempt_enable();
261 }
262
__raw_write_unlock_irq(rwlock_t * lock)263 static inline void __raw_write_unlock_irq(rwlock_t *lock)
264 {
265 rwlock_release(&lock->dep_map, _RET_IP_);
266 do_raw_write_unlock(lock);
267 local_irq_enable();
268 preempt_enable();
269 }
270
__raw_write_unlock_bh(rwlock_t * lock)271 static inline void __raw_write_unlock_bh(rwlock_t *lock)
272 {
273 rwlock_release(&lock->dep_map, _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