mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-15 23:56:45 +07:00
eea62f831b
lglocks and brlocks are currently generated with some complicated macros in lglock.h. But there's no reason to not just use common utility functions and put all the data into a common data structure. Since there are at least two users it makes sense to share this code in a library. This is also easier maintainable than a macro forest. This will also make it later possible to dynamically allocate lglocks and also use them in modules (this would both still need some additional, but now straightforward, code) [akpm@linux-foundation.org: checkpatch fixes] Signed-off-by: Andi Kleen <ak@linux.intel.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
90 lines
1.9 KiB
C
90 lines
1.9 KiB
C
/* See include/linux/lglock.h for description */
|
|
#include <linux/module.h>
|
|
#include <linux/lglock.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/string.h>
|
|
|
|
/*
|
|
* Note there is no uninit, so lglocks cannot be defined in
|
|
* modules (but it's fine to use them from there)
|
|
* Could be added though, just undo lg_lock_init
|
|
*/
|
|
|
|
void lg_lock_init(struct lglock *lg, char *name)
|
|
{
|
|
LOCKDEP_INIT_MAP(&lg->lock_dep_map, name, &lg->lock_key, 0);
|
|
}
|
|
EXPORT_SYMBOL(lg_lock_init);
|
|
|
|
void lg_local_lock(struct lglock *lg)
|
|
{
|
|
arch_spinlock_t *lock;
|
|
|
|
preempt_disable();
|
|
rwlock_acquire_read(&lg->lock_dep_map, 0, 0, _RET_IP_);
|
|
lock = this_cpu_ptr(lg->lock);
|
|
arch_spin_lock(lock);
|
|
}
|
|
EXPORT_SYMBOL(lg_local_lock);
|
|
|
|
void lg_local_unlock(struct lglock *lg)
|
|
{
|
|
arch_spinlock_t *lock;
|
|
|
|
rwlock_release(&lg->lock_dep_map, 1, _RET_IP_);
|
|
lock = this_cpu_ptr(lg->lock);
|
|
arch_spin_unlock(lock);
|
|
preempt_enable();
|
|
}
|
|
EXPORT_SYMBOL(lg_local_unlock);
|
|
|
|
void lg_local_lock_cpu(struct lglock *lg, int cpu)
|
|
{
|
|
arch_spinlock_t *lock;
|
|
|
|
preempt_disable();
|
|
rwlock_acquire_read(&lg->lock_dep_map, 0, 0, _RET_IP_);
|
|
lock = per_cpu_ptr(lg->lock, cpu);
|
|
arch_spin_lock(lock);
|
|
}
|
|
EXPORT_SYMBOL(lg_local_lock_cpu);
|
|
|
|
void lg_local_unlock_cpu(struct lglock *lg, int cpu)
|
|
{
|
|
arch_spinlock_t *lock;
|
|
|
|
rwlock_release(&lg->lock_dep_map, 1, _RET_IP_);
|
|
lock = per_cpu_ptr(lg->lock, cpu);
|
|
arch_spin_unlock(lock);
|
|
preempt_enable();
|
|
}
|
|
EXPORT_SYMBOL(lg_local_unlock_cpu);
|
|
|
|
void lg_global_lock(struct lglock *lg)
|
|
{
|
|
int i;
|
|
|
|
preempt_disable();
|
|
rwlock_acquire(&lg->lock_dep_map, 0, 0, _RET_IP_);
|
|
for_each_possible_cpu(i) {
|
|
arch_spinlock_t *lock;
|
|
lock = per_cpu_ptr(lg->lock, i);
|
|
arch_spin_lock(lock);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(lg_global_lock);
|
|
|
|
void lg_global_unlock(struct lglock *lg)
|
|
{
|
|
int i;
|
|
|
|
rwlock_release(&lg->lock_dep_map, 1, _RET_IP_);
|
|
for_each_possible_cpu(i) {
|
|
arch_spinlock_t *lock;
|
|
lock = per_cpu_ptr(lg->lock, i);
|
|
arch_spin_unlock(lock);
|
|
}
|
|
preempt_enable();
|
|
}
|
|
EXPORT_SYMBOL(lg_global_unlock);
|