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2fc2d1e9 HC |
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 | ||
17 | struct conf_mgm_data { | |
18 | u8 reserved; | |
19 | u8 ev_qualifier; | |
20 | } __attribute__((packed)); | |
21 | ||
22 | #define EV_QUAL_CAP_CHANGE 3 | |
23 | ||
24 | static struct work_struct sclp_cpu_capability_work; | |
25 | ||
26 | static 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"); | |
86ef5c9a | 32 | get_online_cpus(); |
2fc2d1e9 HC |
33 | for_each_online_cpu(cpu) { |
34 | sysdev = get_cpu_sysdev(cpu); | |
35 | kobject_uevent(&sysdev->kobj, KOBJ_CHANGE); | |
36 | } | |
86ef5c9a | 37 | put_online_cpus(); |
2fc2d1e9 HC |
38 | } |
39 | ||
40 | static 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 | ||
49 | static struct sclp_register sclp_conf_register = | |
50 | { | |
51 | .receive_mask = EVTYP_CONFMGMDATA_MASK, | |
52 | .receiver_fn = sclp_conf_receiver_fn, | |
53 | }; | |
54 | ||
55 | static 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); |