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_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;
22 spin_lock(&blk_mq_cpu_notify_lock);
24 list_for_each_entry(notify, &blk_mq_cpu_notify_list, list)
25 notify->notify(notify->data, action, cpu);
27 spin_unlock(&blk_mq_cpu_notify_lock);
31 static struct notifier_block __cpuinitdata blk_mq_main_cpu_notifier = {
32 .notifier_call = blk_mq_main_cpu_notify,
35 void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier)
37 BUG_ON(!notifier->notify);
39 spin_lock(&blk_mq_cpu_notify_lock);
40 list_add_tail(¬ifier->list, &blk_mq_cpu_notify_list);
41 spin_unlock(&blk_mq_cpu_notify_lock);
44 void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier)
46 spin_lock(&blk_mq_cpu_notify_lock);
47 list_del(¬ifier->list);
48 spin_unlock(&blk_mq_cpu_notify_lock);
51 void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
52 void (*fn)(void *, unsigned long, unsigned int),
55 notifier->notify = fn;
56 notifier->data = data;
59 void __init blk_mq_cpu_init(void)
61 register_hotcpu_notifier(&blk_mq_main_cpu_notifier);