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()
79 ref->percpu_count_ptr = 0; in percpu_ref_init()
87 ref->percpu_count_ptr |= __PERCPU_REF_ATOMIC; in percpu_ref_init()
94 ref->percpu_count_ptr |= __PERCPU_REF_DEAD; in percpu_ref_init()
102 data->ref = ref; in percpu_ref_init()
103 ref->data = data; in percpu_ref_init()
108 static void __percpu_ref_exit(struct percpu_ref *ref) in __percpu_ref_exit() argument
110 unsigned long __percpu *percpu_count = percpu_count_ptr(ref); in __percpu_ref_exit()
114 WARN_ON_ONCE(ref->data && ref->data->confirm_switch); in __percpu_ref_exit()
116 ref->percpu_count_ptr = __PERCPU_REF_ATOMIC_DEAD; in __percpu_ref_exit()
130 void percpu_ref_exit(struct percpu_ref *ref) in percpu_ref_exit() argument
132 struct percpu_ref_data *data = ref->data; in percpu_ref_exit()
135 __percpu_ref_exit(ref); in percpu_ref_exit()
141 ref->percpu_count_ptr |= atomic_long_read(&ref->data->count) << in percpu_ref_exit()
143 ref->data = NULL; in percpu_ref_exit()
154 struct percpu_ref *ref = data->ref; in percpu_ref_call_confirm_rcu() local
156 data->confirm_switch(ref); in percpu_ref_call_confirm_rcu()
161 __percpu_ref_exit(ref); in percpu_ref_call_confirm_rcu()
164 percpu_ref_put(ref); in percpu_ref_call_confirm_rcu()
171 struct percpu_ref *ref = data->ref; in percpu_ref_switch_to_atomic_rcu() local
172 unsigned long __percpu *percpu_count = percpu_count_ptr(ref); in percpu_ref_switch_to_atomic_rcu()
209 static void percpu_ref_noop_confirm_switch(struct percpu_ref *ref) in percpu_ref_noop_confirm_switch() argument
213 static void __percpu_ref_switch_to_atomic(struct percpu_ref *ref, in __percpu_ref_switch_to_atomic() argument
216 if (ref->percpu_count_ptr & __PERCPU_REF_ATOMIC) { in __percpu_ref_switch_to_atomic()
218 confirm_switch(ref); in __percpu_ref_switch_to_atomic()
223 ref->percpu_count_ptr |= __PERCPU_REF_ATOMIC; in __percpu_ref_switch_to_atomic()
229 ref->data->confirm_switch = confirm_switch ?: in __percpu_ref_switch_to_atomic()
232 percpu_ref_get(ref); /* put after confirmation */ in __percpu_ref_switch_to_atomic()
233 call_rcu_hurry(&ref->data->rcu, in __percpu_ref_switch_to_atomic()
237 static void __percpu_ref_switch_to_percpu(struct percpu_ref *ref) in __percpu_ref_switch_to_percpu() argument
239 unsigned long __percpu *percpu_count = percpu_count_ptr(ref); in __percpu_ref_switch_to_percpu()
244 if (!(ref->percpu_count_ptr & __PERCPU_REF_ATOMIC)) in __percpu_ref_switch_to_percpu()
247 if (WARN_ON_ONCE(!ref->data->allow_reinit)) in __percpu_ref_switch_to_percpu()
250 atomic_long_add(PERCPU_COUNT_BIAS, &ref->data->count); in __percpu_ref_switch_to_percpu()
261 smp_store_release(&ref->percpu_count_ptr, in __percpu_ref_switch_to_percpu()
262 ref->percpu_count_ptr & ~__PERCPU_REF_ATOMIC); in __percpu_ref_switch_to_percpu()
265 static void __percpu_ref_switch_mode(struct percpu_ref *ref, in __percpu_ref_switch_mode() argument
268 struct percpu_ref_data *data = ref->data; in __percpu_ref_switch_mode()
280 if (data->force_atomic || percpu_ref_is_dying(ref)) in __percpu_ref_switch_mode()
281 __percpu_ref_switch_to_atomic(ref, confirm_switch); in __percpu_ref_switch_mode()
283 __percpu_ref_switch_to_percpu(ref); in __percpu_ref_switch_mode()
306 void percpu_ref_switch_to_atomic(struct percpu_ref *ref, in percpu_ref_switch_to_atomic() argument
313 ref->data->force_atomic = true; in percpu_ref_switch_to_atomic()
314 __percpu_ref_switch_mode(ref, confirm_switch); in percpu_ref_switch_to_atomic()
328 void percpu_ref_switch_to_atomic_sync(struct percpu_ref *ref) in percpu_ref_switch_to_atomic_sync() argument
330 percpu_ref_switch_to_atomic(ref, NULL); in percpu_ref_switch_to_atomic_sync()
331 wait_event(percpu_ref_switch_waitq, !ref->data->confirm_switch); in percpu_ref_switch_to_atomic_sync()
353 void percpu_ref_switch_to_percpu(struct percpu_ref *ref) in percpu_ref_switch_to_percpu() argument
359 ref->data->force_atomic = false; in percpu_ref_switch_to_percpu()
360 __percpu_ref_switch_mode(ref, NULL); in percpu_ref_switch_to_percpu()
383 void percpu_ref_kill_and_confirm(struct percpu_ref *ref, in percpu_ref_kill_and_confirm() argument
390 WARN_ONCE(percpu_ref_is_dying(ref), in percpu_ref_kill_and_confirm()
392 ref->data->release); in percpu_ref_kill_and_confirm()
394 ref->percpu_count_ptr |= __PERCPU_REF_DEAD; in percpu_ref_kill_and_confirm()
395 __percpu_ref_switch_mode(ref, confirm_kill); in percpu_ref_kill_and_confirm()
396 percpu_ref_put(ref); in percpu_ref_kill_and_confirm()
410 bool percpu_ref_is_zero(struct percpu_ref *ref) in percpu_ref_is_zero() argument
415 if (__ref_is_percpu(ref, &percpu_count)) in percpu_ref_is_zero()
420 if (ref->data) in percpu_ref_is_zero()
421 count = atomic_long_read(&ref->data->count); in percpu_ref_is_zero()
423 count = ref->percpu_count_ptr >> __PERCPU_REF_FLAG_BITS; in percpu_ref_is_zero()
441 void percpu_ref_reinit(struct percpu_ref *ref) in percpu_ref_reinit() argument
443 WARN_ON_ONCE(!percpu_ref_is_zero(ref)); in percpu_ref_reinit()
445 percpu_ref_resurrect(ref); in percpu_ref_reinit()
463 void percpu_ref_resurrect(struct percpu_ref *ref) in percpu_ref_resurrect() argument
470 WARN_ON_ONCE(!percpu_ref_is_dying(ref)); in percpu_ref_resurrect()
471 WARN_ON_ONCE(__ref_is_percpu(ref, &percpu_count)); in percpu_ref_resurrect()
473 ref->percpu_count_ptr &= ~__PERCPU_REF_DEAD; in percpu_ref_resurrect()
474 percpu_ref_get(ref); in percpu_ref_resurrect()
475 __percpu_ref_switch_mode(ref, NULL); in percpu_ref_resurrect()