tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
7#include <linux/smp.h>
8#include <linux/cpu.h>
9
10#include <linux/blk-mq.h>
11#include "blk-mq.h"
12
13static LIST_HEAD(blk_mq_cpu_notify_list);
14static DEFINE_SPINLOCK(blk_mq_cpu_notify_lock);
15
16static int blk_mq_main_cpu_notify(struct notifier_block *self,
17 unsigned long action, void *hcpu)
18{
19 unsigned int cpu = (unsigned long) hcpu;
20 struct blk_mq_cpu_notifier *notify;
21
22 spin_lock(&blk_mq_cpu_notify_lock);
23
24 list_for_each_entry(notify, &blk_mq_cpu_notify_list, list)
25 notify->notify(notify->data, action, cpu);
26
27 spin_unlock(&blk_mq_cpu_notify_lock);
28 return NOTIFY_OK;
29}
30
31void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier)
32{
33 BUG_ON(!notifier->notify);
34
35 spin_lock(&blk_mq_cpu_notify_lock);
36 list_add_tail(¬ifier->list, &blk_mq_cpu_notify_list);
37 spin_unlock(&blk_mq_cpu_notify_lock);
38}
39
40void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier)
41{
42 spin_lock(&blk_mq_cpu_notify_lock);
43 list_del(¬ifier->list);
44 spin_unlock(&blk_mq_cpu_notify_lock);
45}
46
47void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
48 void (*fn)(void *, unsigned long, unsigned int),
49 void *data)
50{
51 notifier->notify = fn;
52 notifier->data = data;
53}
54
55void __init blk_mq_cpu_init(void)
56{
57 hotcpu_notifier(blk_mq_main_cpu_notify, 0);
58}