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();
176 preempt_disable();
177 rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
178 LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
179 }
180
__raw_write_lock_irqsave(rwlock_t * lock)181 static inline unsigned long __raw_write_lock_irqsave(rwlock_t *lock)
182 {
183 unsigned long flags;
184
185 local_irq_save(flags);
186 preempt_disable();
187 rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
188 LOCK_CONTENDED_FLAGS(lock, do_raw_write_trylock, do_raw_write_lock,
189 do_raw_write_lock_flags, &flags);
190 return flags;
191 }
192
__raw_write_lock_irq(rwlock_t * lock)193 static inline void __raw_write_lock_irq(rwlock_t *lock)
194 {
195 local_irq_disable();
196 preempt_disable();
197 rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
198 LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
199 }
200
__raw_write_lock_bh(rwlock_t * lock)201 static inline void __raw_write_lock_bh(rwlock_t *lock)
202 {
203 local_bh_disable();
204 preempt_disable();
205 rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
206 LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
207 }
208
__raw_write_lock(rwlock_t * lock)209 static inline void __raw_write_lock(rwlock_t *lock)
210 {
211 preempt_disable();
212 rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
213 LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
214 }
215
216 #endif /* CONFIG_PREEMPT */
217
__raw_write_unlock(rwlock_t * lock)218 static inline void __raw_write_unlock(rwlock_t *lock)
219 {
220 rwlock_release(&lock->dep_map, 1, _RET_IP_);
221 do_raw_write_unlock(lock);
222 preempt_enable();
223 }
224
__raw_read_unlock(rwlock_t * lock)225 static inline void __raw_read_unlock(rwlock_t *lock)
226 {
227 rwlock_release(&lock->dep_map, 1, _RET_IP_);
228 do_raw_read_unlock(lock);
229 preempt_enable();
230 }
231
232 static inline void
__raw_read_unlock_irqrestore(rwlock_t * lock,unsigned long flags)233 __raw_read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
234 {
235 rwlock_release(&lock->dep_map, 1, _RET_IP_);
236 do_raw_read_unlock(lock);
237 local_irq_restore(flags);
238 preempt_enable();
239 }
240
__raw_read_unlock_irq(rwlock_t * lock)241 static inline void __raw_read_unlock_irq(rwlock_t *lock)
242 {
243 rwlock_release(&lock->dep_map, 1, _RET_IP_);
244 do_raw_read_unlock(lock);
245 local_irq_enable();
246 preempt_enable();
247 }
248
__raw_read_unlock_bh(rwlock_t * lock)249 static inline void __raw_read_unlock_bh(rwlock_t *lock)
250 {
251 rwlock_release(&lock->dep_map, 1, _RET_IP_);
252 do_raw_read_unlock(lock);
253 preempt_enable_no_resched();
254 local_bh_enable_ip((unsigned long)__builtin_return_address(0));
255 }
256
__raw_write_unlock_irqrestore(rwlock_t * lock,unsigned long flags)257 static inline void __raw_write_unlock_irqrestore(rwlock_t *lock,
258 unsigned long flags)
259 {
260 rwlock_release(&lock->dep_map, 1, _RET_IP_);
261 do_raw_write_unlock(lock);
262 local_irq_restore(flags);
263 preempt_enable();
264 }
265
__raw_write_unlock_irq(rwlock_t * lock)266 static inline void __raw_write_unlock_irq(rwlock_t *lock)
267 {
268 rwlock_release(&lock->dep_map, 1, _RET_IP_);
269 do_raw_write_unlock(lock);
270 local_irq_enable();
271 preempt_enable();
272 }
273
__raw_write_unlock_bh(rwlock_t * lock)274 static inline void __raw_write_unlock_bh(rwlock_t *lock)
275 {
276 rwlock_release(&lock->dep_map, 1, _RET_IP_);
277 do_raw_write_unlock(lock);
278 preempt_enable_no_resched();
279 local_bh_enable_ip((unsigned long)__builtin_return_address(0));
280 }
281
282 #endif /* __LINUX_RWLOCK_API_SMP_H */
283