mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 11:45:01 +07:00
55cc156505
Add percpu_rwsem_release() and percpu_rwsem_acquire() for the users which need to return to userspace with percpu-rwsem lock held and/or pass the ownership to another thread. TODO: change percpu_rwsem_release() to use rwsem_clear_owner(). We can either fold kernel/locking/rwsem.h into include/linux/rwsem.h, or add the non-inline percpu_rwsem_clear_owner(). Signed-off-by: Oleg Nesterov <oleg@redhat.com>
55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
#ifndef _LINUX_PERCPU_RWSEM_H
|
|
#define _LINUX_PERCPU_RWSEM_H
|
|
|
|
#include <linux/atomic.h>
|
|
#include <linux/rwsem.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/lockdep.h>
|
|
|
|
struct percpu_rw_semaphore {
|
|
unsigned int __percpu *fast_read_ctr;
|
|
atomic_t write_ctr;
|
|
struct rw_semaphore rw_sem;
|
|
atomic_t slow_read_ctr;
|
|
wait_queue_head_t write_waitq;
|
|
};
|
|
|
|
extern void percpu_down_read(struct percpu_rw_semaphore *);
|
|
extern int percpu_down_read_trylock(struct percpu_rw_semaphore *);
|
|
extern void percpu_up_read(struct percpu_rw_semaphore *);
|
|
|
|
extern void percpu_down_write(struct percpu_rw_semaphore *);
|
|
extern void percpu_up_write(struct percpu_rw_semaphore *);
|
|
|
|
extern int __percpu_init_rwsem(struct percpu_rw_semaphore *,
|
|
const char *, struct lock_class_key *);
|
|
extern void percpu_free_rwsem(struct percpu_rw_semaphore *);
|
|
|
|
#define percpu_init_rwsem(brw) \
|
|
({ \
|
|
static struct lock_class_key rwsem_key; \
|
|
__percpu_init_rwsem(brw, #brw, &rwsem_key); \
|
|
})
|
|
|
|
|
|
#define percpu_rwsem_is_held(sem) lockdep_is_held(&(sem)->rw_sem)
|
|
|
|
static inline void percpu_rwsem_release(struct percpu_rw_semaphore *sem,
|
|
bool read, unsigned long ip)
|
|
{
|
|
lock_release(&sem->rw_sem.dep_map, 1, ip);
|
|
#ifdef CONFIG_RWSEM_SPIN_ON_OWNER
|
|
if (!read)
|
|
sem->rw_sem.owner = NULL;
|
|
#endif
|
|
}
|
|
|
|
static inline void percpu_rwsem_acquire(struct percpu_rw_semaphore *sem,
|
|
bool read, unsigned long ip)
|
|
{
|
|
lock_acquire(&sem->rw_sem.dep_map, 0, 1, read, 1, NULL, ip);
|
|
}
|
|
|
|
#endif
|