xref: /openbmc/linux/drivers/s390/char/sclp_config.c (revision 9ac8d3fb) 
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 <asm/smp.h>
14 #include "sclp.h"
15 
16 #define TAG	"sclp_config: "
17 
18 struct 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 
26 static struct work_struct sclp_cpu_capability_work;
27 static struct work_struct sclp_cpu_change_work;
28 
29 static void sclp_cpu_capability_notify(struct work_struct *work)
30 {
31 	int cpu;
32 	struct sys_device *sysdev;
33 
34 	printk(KERN_WARNING TAG "cpu capability changed.\n");
35 	get_online_cpus();
36 	for_each_online_cpu(cpu) {
37 		sysdev = get_cpu_sysdev(cpu);
38 		kobject_uevent(&sysdev->kobj, KOBJ_CHANGE);
39 	}
40 	put_online_cpus();
41 }
42 
43 static void __ref sclp_cpu_change_notify(struct work_struct *work)
44 {
45 	smp_rescan_cpus();
46 }
47 
48 static void sclp_conf_receiver_fn(struct evbuf_header *evbuf)
49 {
50 	struct conf_mgm_data *cdata;
51 
52 	cdata = (struct conf_mgm_data *)(evbuf + 1);
53 	switch (cdata->ev_qualifier) {
54 	case EV_QUAL_CPU_CHANGE:
55 		schedule_work(&sclp_cpu_change_work);
56 		break;
57 	case EV_QUAL_CAP_CHANGE:
58 		schedule_work(&sclp_cpu_capability_work);
59 		break;
60 	}
61 }
62 
63 static struct sclp_register sclp_conf_register =
64 {
65 	.receive_mask = EVTYP_CONFMGMDATA_MASK,
66 	.receiver_fn  = sclp_conf_receiver_fn,
67 };
68 
69 static int __init sclp_conf_init(void)
70 {
71 	int rc;
72 
73 	INIT_WORK(&sclp_cpu_capability_work, sclp_cpu_capability_notify);
74 	INIT_WORK(&sclp_cpu_change_work, sclp_cpu_change_notify);
75 
76 	rc = sclp_register(&sclp_conf_register);
77 	if (rc)
78 		return rc;
79 
80 	if (!(sclp_conf_register.sclp_send_mask & EVTYP_CONFMGMDATA_MASK)) {
81 		printk(KERN_WARNING TAG "no configuration management.\n");
82 		sclp_unregister(&sclp_conf_register);
83 		rc = -ENOSYS;
84 	}
85 	return rc;
86 }
87 
88 __initcall(sclp_conf_init);
89