Line data Source code
1 : #ifndef __LINUX_SPINLOCK_API_SMP_H
2 : #define __LINUX_SPINLOCK_API_SMP_H
3 :
4 : #ifndef __LINUX_SPINLOCK_H
5 : # error "please don't include this file directly"
6 : #endif
7 :
8 : /*
9 : * include/linux/spinlock_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 : int in_lock_functions(unsigned long addr);
19 :
20 : #define assert_raw_spin_locked(x) BUG_ON(!raw_spin_is_locked(x))
21 :
22 : void __lockfunc _raw_spin_lock(raw_spinlock_t *lock) __acquires(lock);
23 : void __lockfunc _raw_spin_lock_nested(raw_spinlock_t *lock, int subclass)
24 : __acquires(lock);
25 : void __lockfunc
26 : _raw_spin_lock_nest_lock(raw_spinlock_t *lock, struct lockdep_map *map)
27 : __acquires(lock);
28 : void __lockfunc _raw_spin_lock_bh(raw_spinlock_t *lock) __acquires(lock);
29 : void __lockfunc _raw_spin_lock_irq(raw_spinlock_t *lock)
30 : __acquires(lock);
31 :
32 : unsigned long __lockfunc _raw_spin_lock_irqsave(raw_spinlock_t *lock)
33 : __acquires(lock);
34 : unsigned long __lockfunc
35 : _raw_spin_lock_irqsave_nested(raw_spinlock_t *lock, int subclass)
36 : __acquires(lock);
37 : int __lockfunc _raw_spin_trylock(raw_spinlock_t *lock);
38 : int __lockfunc _raw_spin_trylock_bh(raw_spinlock_t *lock);
39 : void __lockfunc _raw_spin_unlock(raw_spinlock_t *lock) __releases(lock);
40 : void __lockfunc _raw_spin_unlock_bh(raw_spinlock_t *lock) __releases(lock);
41 : void __lockfunc _raw_spin_unlock_irq(raw_spinlock_t *lock) __releases(lock);
42 : void __lockfunc
43 : _raw_spin_unlock_irqrestore(raw_spinlock_t *lock, unsigned long flags)
44 : __releases(lock);
45 :
46 : #ifdef CONFIG_INLINE_SPIN_LOCK
47 : #define _raw_spin_lock(lock) __raw_spin_lock(lock)
48 : #endif
49 :
50 : #ifdef CONFIG_INLINE_SPIN_LOCK_BH
51 : #define _raw_spin_lock_bh(lock) __raw_spin_lock_bh(lock)
52 : #endif
53 :
54 : #ifdef CONFIG_INLINE_SPIN_LOCK_IRQ
55 : #define _raw_spin_lock_irq(lock) __raw_spin_lock_irq(lock)
56 : #endif
57 :
58 : #ifdef CONFIG_INLINE_SPIN_LOCK_IRQSAVE
59 : #define _raw_spin_lock_irqsave(lock) __raw_spin_lock_irqsave(lock)
60 : #endif
61 :
62 : #ifdef CONFIG_INLINE_SPIN_TRYLOCK
63 : #define _raw_spin_trylock(lock) __raw_spin_trylock(lock)
64 : #endif
65 :
66 : #ifdef CONFIG_INLINE_SPIN_TRYLOCK_BH
67 : #define _raw_spin_trylock_bh(lock) __raw_spin_trylock_bh(lock)
68 : #endif
69 :
70 : #ifndef CONFIG_UNINLINE_SPIN_UNLOCK
71 : #define _raw_spin_unlock(lock) __raw_spin_unlock(lock)
72 : #endif
73 :
74 : #ifdef CONFIG_INLINE_SPIN_UNLOCK_BH
75 : #define _raw_spin_unlock_bh(lock) __raw_spin_unlock_bh(lock)
76 : #endif
77 :
78 : #ifdef CONFIG_INLINE_SPIN_UNLOCK_IRQ
79 : #define _raw_spin_unlock_irq(lock) __raw_spin_unlock_irq(lock)
80 : #endif
81 :
82 : #ifdef CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE
83 : #define _raw_spin_unlock_irqrestore(lock, flags) __raw_spin_unlock_irqrestore(lock, flags)
84 : #endif
85 :
86 : static inline int __raw_spin_trylock(raw_spinlock_t *lock)
87 : {
88 : preempt_disable();
89 : if (do_raw_spin_trylock(lock)) {
90 : spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
91 : return 1;
92 : }
93 : preempt_enable();
94 : return 0;
95 : }
96 :
97 : /*
98 : * If lockdep is enabled then we use the non-preemption spin-ops
99 : * even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
100 : * not re-enabled during lock-acquire (which the preempt-spin-ops do):
101 : */
102 : #if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)
103 :
104 : static inline unsigned long __raw_spin_lock_irqsave(raw_spinlock_t *lock)
105 : {
106 : unsigned long flags;
107 :
108 : local_irq_save(flags);
109 : preempt_disable();
110 : spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
111 : /*
112 : * On lockdep we dont want the hand-coded irq-enable of
113 : * do_raw_spin_lock_flags() code, because lockdep assumes
114 : * that interrupts are not re-enabled during lock-acquire:
115 : */
116 : #ifdef CONFIG_LOCKDEP
117 : LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
118 : #else
119 : do_raw_spin_lock_flags(lock, &flags);
120 : #endif
121 : return flags;
122 : }
123 :
124 : static inline void __raw_spin_lock_irq(raw_spinlock_t *lock)
125 : {
126 : local_irq_disable();
127 : preempt_disable();
128 : spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
129 : LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
130 : }
131 :
132 : static inline void __raw_spin_lock_bh(raw_spinlock_t *lock)
133 : {
134 : __local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
135 : spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
136 : LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
137 : }
138 :
139 : static inline void __raw_spin_lock(raw_spinlock_t *lock)
140 : {
141 : preempt_disable();
142 : spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
143 : LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
144 : }
145 :
146 : #endif /* !CONFIG_GENERIC_LOCKBREAK || CONFIG_DEBUG_LOCK_ALLOC */
147 :
148 : static inline void __raw_spin_unlock(raw_spinlock_t *lock)
149 : {
150 : spin_release(&lock->dep_map, 1, _RET_IP_);
151 : do_raw_spin_unlock(lock);
152 21594974 : preempt_enable();
153 : }
154 :
155 : static inline void __raw_spin_unlock_irqrestore(raw_spinlock_t *lock,
156 : unsigned long flags)
157 : {
158 : spin_release(&lock->dep_map, 1, _RET_IP_);
159 : do_raw_spin_unlock(lock);
160 : local_irq_restore(flags);
161 : preempt_enable();
162 : }
163 :
164 2361091 : static inline void __raw_spin_unlock_irq(raw_spinlock_t *lock)
165 : {
166 : spin_release(&lock->dep_map, 1, _RET_IP_);
167 : do_raw_spin_unlock(lock);
168 : local_irq_enable();
169 2361091 : preempt_enable();
170 2361094 : }
171 :
172 : static inline void __raw_spin_unlock_bh(raw_spinlock_t *lock)
173 : {
174 : spin_release(&lock->dep_map, 1, _RET_IP_);
175 : do_raw_spin_unlock(lock);
176 : __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
177 : }
178 :
179 : static inline int __raw_spin_trylock_bh(raw_spinlock_t *lock)
180 : {
181 : __local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
182 : if (do_raw_spin_trylock(lock)) {
183 : spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
184 : return 1;
185 : }
186 : __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
187 : return 0;
188 : }
189 :
190 : #include <linux/rwlock_api_smp.h>
191 :
192 : #endif /* __LINUX_SPINLOCK_API_SMP_H */
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