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authorHeiko Carstens <heiko.carstens@de.ibm.com>2007-04-27 10:01:56 -0400
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2007-04-27 10:01:46 -0400
commit2fc2d1e9ffcde78af7ab63ed640d9a4901797de2 (patch)
tree9fd8fcbf4b6882200480da1f04e30b406d1f8a57 /drivers/s390/char/sclp_config.c
parentdb77aa5f3d01fe6a6cc629dbd37936b1fdd129ba (diff)
[S390] Processor degradation notification.
Generate uevents for all cpus if cpu capability changes. This can happen e.g. because the cpus are overheating. The cpu capability can be read via /sys/devices/system/cpu/cpuN/capability. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Diffstat (limited to 'drivers/s390/char/sclp_config.c')
-rw-r--r--drivers/s390/char/sclp_config.c75
1 files changed, 75 insertions, 0 deletions
diff --git a/drivers/s390/char/sclp_config.c b/drivers/s390/char/sclp_config.c
new file mode 100644
index 000000000000..5322e5e54a98
--- /dev/null
+++ b/drivers/s390/char/sclp_config.c
@@ -0,0 +1,75 @@
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);