1 #include <linux/kernel.h>
2 #include <linux/module.h>
3 #include <linux/init.h>
4 #include <linux/blkdev.h>
5 #include <linux/list.h>
6 #include <linux/llist.h>
10 #include <linux/blk-mq.h>
13 static LIST_HEAD(blk_mq_cpu_notify_list);
14 static DEFINE_RAW_SPINLOCK(blk_mq_cpu_notify_lock);
16 static int blk_mq_main_cpu_notify(struct notifier_block *self,
17 unsigned long action, void *hcpu)
19 unsigned int cpu = (unsigned long) hcpu;
20 struct blk_mq_cpu_notifier *notify;
23 raw_spin_lock(&blk_mq_cpu_notify_lock);
25 list_for_each_entry(notify, &blk_mq_cpu_notify_list, list) {
26 ret = notify->notify(notify->data, action, cpu);
31 raw_spin_unlock(&blk_mq_cpu_notify_lock);
35 void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier)
37 BUG_ON(!notifier->notify);
39 raw_spin_lock(&blk_mq_cpu_notify_lock);
40 list_add_tail(¬ifier->list, &blk_mq_cpu_notify_list);
41 raw_spin_unlock(&blk_mq_cpu_notify_lock);
44 void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier)
46 raw_spin_lock(&blk_mq_cpu_notify_lock);
47 list_del(¬ifier->list);
48 raw_spin_unlock(&blk_mq_cpu_notify_lock);
51 void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
52 int (*fn)(void *, unsigned long, unsigned int),
55 notifier->notify = fn;
56 notifier->data = data;
59 void __init blk_mq_cpu_init(void)
61 hotcpu_notifier(blk_mq_main_cpu_notify, 0);