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
__raw_spin_trylock(raw_spinlock_t * lock)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_PREEMPTION, 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
__raw_spin_lock_irqsave(raw_spinlock_t * lock)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
__raw_spin_lock_irq(raw_spinlock_t * lock)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
__raw_spin_lock_bh(raw_spinlock_t * lock)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
__raw_spin_lock(raw_spinlock_t * lock)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
__raw_spin_unlock(raw_spinlock_t * lock)148 static inline void __raw_spin_unlock(raw_spinlock_t *lock)
149 {
150 spin_release(&lock->dep_map, _RET_IP_);
151 do_raw_spin_unlock(lock);
152 preempt_enable();
153 }
154
__raw_spin_unlock_irqrestore(raw_spinlock_t * lock,unsigned long flags)155 static inline void __raw_spin_unlock_irqrestore(raw_spinlock_t *lock,
156 unsigned long flags)
157 {
158 spin_release(&lock->dep_map, _RET_IP_);
159 do_raw_spin_unlock(lock);
160 local_irq_restore(flags);
161 preempt_enable();
162 }
163
__raw_spin_unlock_irq(raw_spinlock_t * lock)164 static inline void __raw_spin_unlock_irq(raw_spinlock_t *lock)
165 {
166 spin_release(&lock->dep_map, _RET_IP_);
167 do_raw_spin_unlock(lock);
168 local_irq_enable();
169 preempt_enable();
170 }
171
__raw_spin_unlock_bh(raw_spinlock_t * lock)172 static inline void __raw_spin_unlock_bh(raw_spinlock_t *lock)
173 {
174 spin_release(&lock->dep_map, _RET_IP_);
175 do_raw_spin_unlock(lock);
176 __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
177 }
178
__raw_spin_trylock_bh(raw_spinlock_t * lock)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 */
193