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#include <linux/init.h>
9#include <linux/errno.h>
10#include <linux/cpu.h>
11#include <linux/sysdev.h>
12#include <linux/workqueue.h>
13#include "sclp.h"
14
15#define TAG	"sclp_config: "
16
17struct conf_mgm_data {
18	u8 reserved;
19	u8 ev_qualifier;
20} __attribute__((packed));
21
22#define EV_QUAL_CAP_CHANGE	3
23
24static struct work_struct sclp_cpu_capability_work;
25
26static void sclp_cpu_capability_notify(struct work_struct *work)
27{
28	int cpu;
29	struct sys_device *sysdev;
30
31	printk(KERN_WARNING TAG "cpu capability changed.\n");
32	lock_cpu_hotplug();
33	for_each_online_cpu(cpu) {
34		sysdev = get_cpu_sysdev(cpu);
35		kobject_uevent(&sysdev->kobj, KOBJ_CHANGE);
36	}
37	unlock_cpu_hotplug();
38}
39
40static void sclp_conf_receiver_fn(struct evbuf_header *evbuf)
41{
42	struct conf_mgm_data *cdata;
43
44	cdata = (struct conf_mgm_data *)(evbuf + 1);
45	if (cdata->ev_qualifier == EV_QUAL_CAP_CHANGE)
46		schedule_work(&sclp_cpu_capability_work);
47}
48
49static struct sclp_register sclp_conf_register =
50{
51	.receive_mask = EVTYP_CONFMGMDATA_MASK,
52	.receiver_fn  = sclp_conf_receiver_fn,
53};
54
55static int __init sclp_conf_init(void)
56{
57	int rc;
58
59	INIT_WORK(&sclp_cpu_capability_work, sclp_cpu_capability_notify);
60
61	rc = sclp_register(&sclp_conf_register);
62	if (rc) {
63		printk(KERN_ERR TAG "failed to register (%d).\n", rc);
64		return rc;
65	}
66
67	if (!(sclp_conf_register.sclp_receive_mask & EVTYP_CONFMGMDATA_MASK)) {
68		printk(KERN_WARNING TAG "no configuration management.\n");
69		sclp_unregister(&sclp_conf_register);
70		rc = -ENOSYS;
71	}
72	return rc;
73}
74
75__initcall(sclp_conf_init);
76