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/sysdev.h>
15 #include <linux/workqueue.h>
16 #include <asm/smp.h>
17
18 #include "sclp.h"
19
20 struct 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
28 static struct work_struct sclp_cpu_capability_work;
29 static struct work_struct sclp_cpu_change_work;
30
31 static void sclp_cpu_capability_notify(struct work_struct *work)
32 {
33 int cpu;
34 struct sys_device *sysdev;
35
36 pr_warning("cpu capability changed.\n");
37 get_online_cpus();
38 for_each_online_cpu(cpu) {
39 sysdev = get_cpu_sysdev(cpu);
40 kobject_uevent(&sysdev->kobj, KOBJ_CHANGE);
41 }
42 put_online_cpus();
43 }
44
45 static void __ref sclp_cpu_change_notify(struct work_struct *work)
46 {
47 smp_rescan_cpus();
48 }
49
50 static void sclp_conf_receiver_fn(struct evbuf_header *evbuf)
51 {
52 struct conf_mgm_data *cdata;
53
54 cdata = (struct conf_mgm_data *)(evbuf + 1);
55 switch (cdata->ev_qualifier) {
56 case EV_QUAL_CPU_CHANGE:
57 schedule_work(&sclp_cpu_change_work);
58 break;
59 case EV_QUAL_CAP_CHANGE:
60 schedule_work(&sclp_cpu_capability_work);
61 break;
62 }
63 }
64
65 static struct sclp_register sclp_conf_register =
66 {
67 .receive_mask = EVTYP_CONFMGMDATA_MASK,
68 .receiver_fn = sclp_conf_receiver_fn,
69 };
70
71 static int __init sclp_conf_init(void)
72 {
73 int rc;
74
75 INIT_WORK(&sclp_cpu_capability_work, sclp_cpu_capability_notify);
76 INIT_WORK(&sclp_cpu_change_work, sclp_cpu_change_notify);
77
78 rc = sclp_register(&sclp_conf_register);
79 if (rc)
80 return rc;
81
82 if (!(sclp_conf_register.sclp_send_mask & EVTYP_CONFMGMDATA_MASK)) {
83 pr_warning("no configuration management.\n");
84 sclp_unregister(&sclp_conf_register);
85 rc = -ENOSYS;
86 }
87 return rc;
88 }
89
90 __initcall(sclp_conf_init);
91
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