2 * CPU notifier helper code for blk-mq
4 * Copyright (C) 2013-2014 Jens Axboe
6 #include <linux/kernel.h>
7 #include <linux/module.h>
8 #include <linux/init.h>
9 #include <linux/blkdev.h>
10 #include <linux/list.h>
11 #include <linux/llist.h>
12 #include <linux/smp.h>
13 #include <linux/cpu.h>
15 #include <linux/blk-mq.h>
18 static LIST_HEAD(blk_mq_cpu_notify_list
);
19 static DEFINE_RAW_SPINLOCK(blk_mq_cpu_notify_lock
);
21 static int blk_mq_main_cpu_notify(struct notifier_block
*self
,
22 unsigned long action
, void *hcpu
)
24 unsigned int cpu
= (unsigned long) hcpu
;
25 struct blk_mq_cpu_notifier
*notify
;
28 raw_spin_lock(&blk_mq_cpu_notify_lock
);
30 list_for_each_entry(notify
, &blk_mq_cpu_notify_list
, list
) {
31 ret
= notify
->notify(notify
->data
, action
, cpu
);
36 raw_spin_unlock(&blk_mq_cpu_notify_lock
);
40 void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier
*notifier
)
42 BUG_ON(!notifier
->notify
);
44 raw_spin_lock(&blk_mq_cpu_notify_lock
);
45 list_add_tail(¬ifier
->list
, &blk_mq_cpu_notify_list
);
46 raw_spin_unlock(&blk_mq_cpu_notify_lock
);
49 void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier
*notifier
)
51 raw_spin_lock(&blk_mq_cpu_notify_lock
);
52 list_del(¬ifier
->list
);
53 raw_spin_unlock(&blk_mq_cpu_notify_lock
);
56 void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier
*notifier
,
57 int (*fn
)(void *, unsigned long, unsigned int),
60 notifier
->notify
= fn
;
61 notifier
->data
= data
;
64 void __init
blk_mq_cpu_init(void)
66 hotcpu_notifier(blk_mq_main_cpu_notify
, 0);
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