1 #ifndef __LINUX_SPINLOCK_API_SMP_H
2 #define __LINUX_SPINLOCK_API_SMP_H
3
4 #ifndef __LINUX_INSIDE_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_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
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 LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
112 return flags;
113 }
114
115 static inline void __raw_spin_lock_irq(raw_spinlock_t *lock)
116 {
117 local_irq_disable();
118 preempt_disable();
119 spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
120 LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
121 }
122
123 static inline void __raw_spin_lock_bh(raw_spinlock_t *lock)
124 {
125 __local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
126 spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
127 LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
128 }
129
130 static inline void __raw_spin_lock(raw_spinlock_t *lock)
131 {
132 preempt_disable();
133 spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
134 LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
135 }
136
137 #endif /* !CONFIG_GENERIC_LOCKBREAK || CONFIG_DEBUG_LOCK_ALLOC */
138
139 static inline void __raw_spin_unlock(raw_spinlock_t *lock)
140 {
141 spin_release(&lock->dep_map, _RET_IP_);
142 do_raw_spin_unlock(lock);
143 preempt_enable();
144 }
145
146 static inline void __raw_spin_unlock_irqrestore(raw_spinlock_t *lock,
147 unsigned long flags)
148 {
149 spin_release(&lock->dep_map, _RET_IP_);
150 do_raw_spin_unlock(lock);
151 local_irq_restore(flags);
152 preempt_enable();
153 }
154
155 static inline void __raw_spin_unlock_irq(raw_spinlock_t *lock)
156 {
157 spin_release(&lock->dep_map, _RET_IP_);
158 do_raw_spin_unlock(lock);
159 local_irq_enable();
160 preempt_enable();
161 }
162
163 static inline void __raw_spin_unlock_bh(raw_spinlock_t *lock)
164 {
165 spin_release(&lock->dep_map, _RET_IP_);
166 do_raw_spin_unlock(lock);
167 __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
168 }
169
170 static inline int __raw_spin_trylock_bh(raw_spinlock_t *lock)
171 {
172 __local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
173 if (do_raw_spin_trylock(lock)) {
174 spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
175 return 1;
176 }
177 __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
178 return 0;
179 }
180
181 /* PREEMPT_RT has its own rwlock implementation */
182 #ifndef CONFIG_PREEMPT_RT
183 #include <linux/rwlock_api_smp.h>
184 #endif
185
186 #endif /* __LINUX_SPINLOCK_API_SMP_H */
187
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