Lines Matching refs:ref
42 static unsigned long __percpu *percpu_count_ptr(struct percpu_ref *ref) in percpu_count_ptr() argument
45 (ref->percpu_count_ptr & ~__PERCPU_REF_ATOMIC_DEAD); in percpu_count_ptr()
63 int percpu_ref_init(struct percpu_ref *ref, percpu_ref_func_t *release, in percpu_ref_init() argument
71 ref->percpu_count_ptr = (unsigned long) in percpu_ref_init()
73 if (!ref->percpu_count_ptr) in percpu_ref_init()
76 data = kzalloc(sizeof(*ref->data), gfp); in percpu_ref_init()
78 free_percpu((void __percpu *)ref->percpu_count_ptr); in percpu_ref_init()
86 ref->percpu_count_ptr |= __PERCPU_REF_ATOMIC; in percpu_ref_init()
93 ref->percpu_count_ptr |= __PERCPU_REF_DEAD; in percpu_ref_init()
101 data->ref = ref; in percpu_ref_init()
102 ref->data = data; in percpu_ref_init()
107 static void __percpu_ref_exit(struct percpu_ref *ref) in __percpu_ref_exit() argument
109 unsigned long __percpu *percpu_count = percpu_count_ptr(ref); in __percpu_ref_exit()
113 WARN_ON_ONCE(ref->data && ref->data->confirm_switch); in __percpu_ref_exit()
115 ref->percpu_count_ptr = __PERCPU_REF_ATOMIC_DEAD; in __percpu_ref_exit()
129 void percpu_ref_exit(struct percpu_ref *ref) in percpu_ref_exit() argument
131 struct percpu_ref_data *data = ref->data; in percpu_ref_exit()
134 __percpu_ref_exit(ref); in percpu_ref_exit()
140 ref->percpu_count_ptr |= atomic_long_read(&ref->data->count) << in percpu_ref_exit()
142 ref->data = NULL; in percpu_ref_exit()
153 struct percpu_ref *ref = data->ref; in percpu_ref_call_confirm_rcu() local
155 data->confirm_switch(ref); in percpu_ref_call_confirm_rcu()
160 __percpu_ref_exit(ref); in percpu_ref_call_confirm_rcu()
163 percpu_ref_put(ref); in percpu_ref_call_confirm_rcu()
170 struct percpu_ref *ref = data->ref; in percpu_ref_switch_to_atomic_rcu() local
171 unsigned long __percpu *percpu_count = percpu_count_ptr(ref); in percpu_ref_switch_to_atomic_rcu()
208 static void percpu_ref_noop_confirm_switch(struct percpu_ref *ref) in percpu_ref_noop_confirm_switch() argument
212 static void __percpu_ref_switch_to_atomic(struct percpu_ref *ref, in __percpu_ref_switch_to_atomic() argument
215 if (ref->percpu_count_ptr & __PERCPU_REF_ATOMIC) { in __percpu_ref_switch_to_atomic()
217 confirm_switch(ref); in __percpu_ref_switch_to_atomic()
222 ref->percpu_count_ptr |= __PERCPU_REF_ATOMIC; in __percpu_ref_switch_to_atomic()
228 ref->data->confirm_switch = confirm_switch ?: in __percpu_ref_switch_to_atomic()
231 percpu_ref_get(ref); /* put after confirmation */ in __percpu_ref_switch_to_atomic()
232 call_rcu(&ref->data->rcu, percpu_ref_switch_to_atomic_rcu); in __percpu_ref_switch_to_atomic()
235 static void __percpu_ref_switch_to_percpu(struct percpu_ref *ref) in __percpu_ref_switch_to_percpu() argument
237 unsigned long __percpu *percpu_count = percpu_count_ptr(ref); in __percpu_ref_switch_to_percpu()
242 if (!(ref->percpu_count_ptr & __PERCPU_REF_ATOMIC)) in __percpu_ref_switch_to_percpu()
245 if (WARN_ON_ONCE(!ref->data->allow_reinit)) in __percpu_ref_switch_to_percpu()
248 atomic_long_add(PERCPU_COUNT_BIAS, &ref->data->count); in __percpu_ref_switch_to_percpu()
259 smp_store_release(&ref->percpu_count_ptr, in __percpu_ref_switch_to_percpu()
260 ref->percpu_count_ptr & ~__PERCPU_REF_ATOMIC); in __percpu_ref_switch_to_percpu()
263 static void __percpu_ref_switch_mode(struct percpu_ref *ref, in __percpu_ref_switch_mode() argument
266 struct percpu_ref_data *data = ref->data; in __percpu_ref_switch_mode()
278 if (data->force_atomic || percpu_ref_is_dying(ref)) in __percpu_ref_switch_mode()
279 __percpu_ref_switch_to_atomic(ref, confirm_switch); in __percpu_ref_switch_mode()
281 __percpu_ref_switch_to_percpu(ref); in __percpu_ref_switch_mode()
304 void percpu_ref_switch_to_atomic(struct percpu_ref *ref, in percpu_ref_switch_to_atomic() argument
311 ref->data->force_atomic = true; in percpu_ref_switch_to_atomic()
312 __percpu_ref_switch_mode(ref, confirm_switch); in percpu_ref_switch_to_atomic()
326 void percpu_ref_switch_to_atomic_sync(struct percpu_ref *ref) in percpu_ref_switch_to_atomic_sync() argument
328 percpu_ref_switch_to_atomic(ref, NULL); in percpu_ref_switch_to_atomic_sync()
329 wait_event(percpu_ref_switch_waitq, !ref->data->confirm_switch); in percpu_ref_switch_to_atomic_sync()
351 void percpu_ref_switch_to_percpu(struct percpu_ref *ref) in percpu_ref_switch_to_percpu() argument
357 ref->data->force_atomic = false; in percpu_ref_switch_to_percpu()
358 __percpu_ref_switch_mode(ref, NULL); in percpu_ref_switch_to_percpu()
381 void percpu_ref_kill_and_confirm(struct percpu_ref *ref, in percpu_ref_kill_and_confirm() argument
388 WARN_ONCE(percpu_ref_is_dying(ref), in percpu_ref_kill_and_confirm()
390 ref->data->release); in percpu_ref_kill_and_confirm()
392 ref->percpu_count_ptr |= __PERCPU_REF_DEAD; in percpu_ref_kill_and_confirm()
393 __percpu_ref_switch_mode(ref, confirm_kill); in percpu_ref_kill_and_confirm()
394 percpu_ref_put(ref); in percpu_ref_kill_and_confirm()
408 bool percpu_ref_is_zero(struct percpu_ref *ref) in percpu_ref_is_zero() argument
413 if (__ref_is_percpu(ref, &percpu_count)) in percpu_ref_is_zero()
418 if (ref->data) in percpu_ref_is_zero()
419 count = atomic_long_read(&ref->data->count); in percpu_ref_is_zero()
421 count = ref->percpu_count_ptr >> __PERCPU_REF_FLAG_BITS; in percpu_ref_is_zero()
439 void percpu_ref_reinit(struct percpu_ref *ref) in percpu_ref_reinit() argument
441 WARN_ON_ONCE(!percpu_ref_is_zero(ref)); in percpu_ref_reinit()
443 percpu_ref_resurrect(ref); in percpu_ref_reinit()
461 void percpu_ref_resurrect(struct percpu_ref *ref) in percpu_ref_resurrect() argument
468 WARN_ON_ONCE(!percpu_ref_is_dying(ref)); in percpu_ref_resurrect()
469 WARN_ON_ONCE(__ref_is_percpu(ref, &percpu_count)); in percpu_ref_resurrect()
471 ref->percpu_count_ptr &= ~__PERCPU_REF_DEAD; in percpu_ref_resurrect()
472 percpu_ref_get(ref); in percpu_ref_resurrect()
473 __percpu_ref_switch_mode(ref, NULL); in percpu_ref_resurrect()