112 lines
2.5 KiB
C
112 lines
2.5 KiB
C
/* See include/linux/lglock.h for description */
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#include <linux/module.h>
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#include <linux/lglock.h>
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#include <linux/cpu.h>
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#include <linux/string.h>
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/*
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* Note there is no uninit, so lglocks cannot be defined in
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* modules (but it's fine to use them from there)
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* Could be added though, just undo lg_lock_init
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*/
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void lg_lock_init(struct lglock *lg, char *name)
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{
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LOCKDEP_INIT_MAP(&lg->lock_dep_map, name, &lg->lock_key, 0);
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}
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EXPORT_SYMBOL(lg_lock_init);
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void lg_local_lock(struct lglock *lg)
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{
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arch_spinlock_t *lock;
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preempt_disable();
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lock_acquire_shared(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_);
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lock = this_cpu_ptr(lg->lock);
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arch_spin_lock(lock);
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}
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EXPORT_SYMBOL(lg_local_lock);
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void lg_local_unlock(struct lglock *lg)
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{
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arch_spinlock_t *lock;
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lock_release(&lg->lock_dep_map, 1, _RET_IP_);
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lock = this_cpu_ptr(lg->lock);
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arch_spin_unlock(lock);
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preempt_enable();
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}
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EXPORT_SYMBOL(lg_local_unlock);
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void lg_local_lock_cpu(struct lglock *lg, int cpu)
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{
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arch_spinlock_t *lock;
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preempt_disable();
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lock_acquire_shared(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_);
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lock = per_cpu_ptr(lg->lock, cpu);
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arch_spin_lock(lock);
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}
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EXPORT_SYMBOL(lg_local_lock_cpu);
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void lg_local_unlock_cpu(struct lglock *lg, int cpu)
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{
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arch_spinlock_t *lock;
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lock_release(&lg->lock_dep_map, 1, _RET_IP_);
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lock = per_cpu_ptr(lg->lock, cpu);
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arch_spin_unlock(lock);
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preempt_enable();
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}
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EXPORT_SYMBOL(lg_local_unlock_cpu);
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void lg_double_lock(struct lglock *lg, int cpu1, int cpu2)
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{
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BUG_ON(cpu1 == cpu2);
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/* lock in cpu order, just like lg_global_lock */
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if (cpu2 < cpu1)
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swap(cpu1, cpu2);
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preempt_disable();
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lock_acquire_shared(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_);
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arch_spin_lock(per_cpu_ptr(lg->lock, cpu1));
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arch_spin_lock(per_cpu_ptr(lg->lock, cpu2));
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}
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void lg_double_unlock(struct lglock *lg, int cpu1, int cpu2)
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{
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lock_release(&lg->lock_dep_map, 1, _RET_IP_);
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arch_spin_unlock(per_cpu_ptr(lg->lock, cpu1));
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arch_spin_unlock(per_cpu_ptr(lg->lock, cpu2));
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preempt_enable();
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}
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void lg_global_lock(struct lglock *lg)
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{
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int i;
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preempt_disable();
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lock_acquire_exclusive(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_);
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for_each_possible_cpu(i) {
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arch_spinlock_t *lock;
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lock = per_cpu_ptr(lg->lock, i);
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arch_spin_lock(lock);
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}
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}
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EXPORT_SYMBOL(lg_global_lock);
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void lg_global_unlock(struct lglock *lg)
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{
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int i;
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lock_release(&lg->lock_dep_map, 1, _RET_IP_);
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for_each_possible_cpu(i) {
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arch_spinlock_t *lock;
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lock = per_cpu_ptr(lg->lock, i);
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arch_spin_unlock(lock);
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}
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preempt_enable();
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}
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EXPORT_SYMBOL(lg_global_unlock);
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