tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright IBM Corp. 2007
3 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
4 */
5
6#define KMSG_COMPONENT "sclp_config"
7#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
8
9#include <linux/init.h>
10#include <linux/errno.h>
11#include <linux/cpu.h>
12#include <linux/device.h>
13#include <linux/workqueue.h>
14#include <asm/smp.h>
15
16#include "sclp.h"
17
18struct conf_mgm_data {
19 u8 reserved;
20 u8 ev_qualifier;
21} __attribute__((packed));
22
23#define EV_QUAL_CPU_CHANGE 1
24#define EV_QUAL_CAP_CHANGE 3
25
26static struct work_struct sclp_cpu_capability_work;
27static struct work_struct sclp_cpu_change_work;
28
29static void sclp_cpu_capability_notify(struct work_struct *work)
30{
31 int cpu;
32 struct device *dev;
33
34 s390_adjust_jiffies();
35 pr_info("CPU capability may have changed\n");
36 get_online_cpus();
37 for_each_online_cpu(cpu) {
38 dev = get_cpu_device(cpu);
39 kobject_uevent(&dev->kobj, KOBJ_CHANGE);
40 }
41 put_online_cpus();
42}
43
44static void __ref sclp_cpu_change_notify(struct work_struct *work)
45{
46 smp_rescan_cpus();
47}
48
49static void sclp_conf_receiver_fn(struct evbuf_header *evbuf)
50{
51 struct conf_mgm_data *cdata;
52
53 cdata = (struct conf_mgm_data *)(evbuf + 1);
54 switch (cdata->ev_qualifier) {
55 case EV_QUAL_CPU_CHANGE:
56 schedule_work(&sclp_cpu_change_work);
57 break;
58 case EV_QUAL_CAP_CHANGE:
59 schedule_work(&sclp_cpu_capability_work);
60 break;
61 }
62}
63
64static struct sclp_register sclp_conf_register =
65{
66 .receive_mask = EVTYP_CONFMGMDATA_MASK,
67 .receiver_fn = sclp_conf_receiver_fn,
68};
69
70static int __init sclp_conf_init(void)
71{
72 INIT_WORK(&sclp_cpu_capability_work, sclp_cpu_capability_notify);
73 INIT_WORK(&sclp_cpu_change_work, sclp_cpu_change_notify);
74 return sclp_register(&sclp_conf_register);
75}
76
77__initcall(sclp_conf_init);