Root/kernel/lglock.c

1/* See include/linux/lglock.h for description */
2#include <linux/module.h>
3#include <linux/lglock.h>
4#include <linux/cpu.h>
5#include <linux/string.h>
6
7/*
8 * Note there is no uninit, so lglocks cannot be defined in
9 * modules (but it's fine to use them from there)
10 * Could be added though, just undo lg_lock_init
11 */
12
13void lg_lock_init(struct lglock *lg, char *name)
14{
15    LOCKDEP_INIT_MAP(&lg->lock_dep_map, name, &lg->lock_key, 0);
16}
17EXPORT_SYMBOL(lg_lock_init);
18
19void lg_local_lock(struct lglock *lg)
20{
21    arch_spinlock_t *lock;
22
23    preempt_disable();
24    rwlock_acquire_read(&lg->lock_dep_map, 0, 0, _RET_IP_);
25    lock = this_cpu_ptr(lg->lock);
26    arch_spin_lock(lock);
27}
28EXPORT_SYMBOL(lg_local_lock);
29
30void lg_local_unlock(struct lglock *lg)
31{
32    arch_spinlock_t *lock;
33
34    rwlock_release(&lg->lock_dep_map, 1, _RET_IP_);
35    lock = this_cpu_ptr(lg->lock);
36    arch_spin_unlock(lock);
37    preempt_enable();
38}
39EXPORT_SYMBOL(lg_local_unlock);
40
41void lg_local_lock_cpu(struct lglock *lg, int cpu)
42{
43    arch_spinlock_t *lock;
44
45    preempt_disable();
46    rwlock_acquire_read(&lg->lock_dep_map, 0, 0, _RET_IP_);
47    lock = per_cpu_ptr(lg->lock, cpu);
48    arch_spin_lock(lock);
49}
50EXPORT_SYMBOL(lg_local_lock_cpu);
51
52void lg_local_unlock_cpu(struct lglock *lg, int cpu)
53{
54    arch_spinlock_t *lock;
55
56    rwlock_release(&lg->lock_dep_map, 1, _RET_IP_);
57    lock = per_cpu_ptr(lg->lock, cpu);
58    arch_spin_unlock(lock);
59    preempt_enable();
60}
61EXPORT_SYMBOL(lg_local_unlock_cpu);
62
63void lg_global_lock(struct lglock *lg)
64{
65    int i;
66
67    preempt_disable();
68    rwlock_acquire(&lg->lock_dep_map, 0, 0, _RET_IP_);
69    for_each_possible_cpu(i) {
70        arch_spinlock_t *lock;
71        lock = per_cpu_ptr(lg->lock, i);
72        arch_spin_lock(lock);
73    }
74}
75EXPORT_SYMBOL(lg_global_lock);
76
77void lg_global_unlock(struct lglock *lg)
78{
79    int i;
80
81    rwlock_release(&lg->lock_dep_map, 1, _RET_IP_);
82    for_each_possible_cpu(i) {
83        arch_spinlock_t *lock;
84        lock = per_cpu_ptr(lg->lock, i);
85        arch_spin_unlock(lock);
86    }
87    preempt_enable();
88}
89EXPORT_SYMBOL(lg_global_unlock);
90

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