tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * drivers/s390/char/sclp_config.c
3 *
4 * Copyright IBM Corp. 2007
5 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
6 */
7
8#define KMSG_COMPONENT "sclp_config"
9#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
10
11#include <linux/init.h>
12#include <linux/errno.h>
13#include <linux/cpu.h>
14#include <linux/device.h>
15#include <linux/workqueue.h>
16#include <asm/smp.h>
17
18#include "sclp.h"
19
20struct conf_mgm_data {
21 u8 reserved;
22 u8 ev_qualifier;
23} __attribute__((packed));
24
25#define EV_QUAL_CPU_CHANGE 1
26#define EV_QUAL_CAP_CHANGE 3
27
28static struct work_struct sclp_cpu_capability_work;
29static struct work_struct sclp_cpu_change_work;
30
31static void sclp_cpu_capability_notify(struct work_struct *work)
32{
33 int cpu;
34 struct device *dev;
35
36 s390_adjust_jiffies();
37 pr_warning("cpu capability changed.\n");
38 get_online_cpus();
39 for_each_online_cpu(cpu) {
40 dev = get_cpu_device(cpu);
41 kobject_uevent(&dev->kobj, KOBJ_CHANGE);
42 }
43 put_online_cpus();
44}
45
46static void __ref sclp_cpu_change_notify(struct work_struct *work)
47{
48 smp_rescan_cpus();
49}
50
51static void sclp_conf_receiver_fn(struct evbuf_header *evbuf)
52{
53 struct conf_mgm_data *cdata;
54
55 cdata = (struct conf_mgm_data *)(evbuf + 1);
56 switch (cdata->ev_qualifier) {
57 case EV_QUAL_CPU_CHANGE:
58 schedule_work(&sclp_cpu_change_work);
59 break;
60 case EV_QUAL_CAP_CHANGE:
61 schedule_work(&sclp_cpu_capability_work);
62 break;
63 }
64}
65
66static struct sclp_register sclp_conf_register =
67{
68 .receive_mask = EVTYP_CONFMGMDATA_MASK,
69 .receiver_fn = sclp_conf_receiver_fn,
70};
71
72static int __init sclp_conf_init(void)
73{
74 INIT_WORK(&sclp_cpu_capability_work, sclp_cpu_capability_notify);
75 INIT_WORK(&sclp_cpu_change_work, sclp_cpu_change_notify);
76 return sclp_register(&sclp_conf_register);
77}
78
79__initcall(sclp_conf_init);