2fc2d1e9ff
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>
75 lines
1.6 KiB
C
75 lines
1.6 KiB
C
/*
|
|
* drivers/s390/char/sclp_config.c
|
|
*
|
|
* Copyright IBM Corp. 2007
|
|
* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/sysdev.h>
|
|
#include <linux/workqueue.h>
|
|
#include "sclp.h"
|
|
|
|
#define TAG "sclp_config: "
|
|
|
|
struct conf_mgm_data {
|
|
u8 reserved;
|
|
u8 ev_qualifier;
|
|
} __attribute__((packed));
|
|
|
|
#define EV_QUAL_CAP_CHANGE 3
|
|
|
|
static struct work_struct sclp_cpu_capability_work;
|
|
|
|
static void sclp_cpu_capability_notify(struct work_struct *work)
|
|
{
|
|
int cpu;
|
|
struct sys_device *sysdev;
|
|
|
|
printk(KERN_WARNING TAG "cpu capability changed.\n");
|
|
lock_cpu_hotplug();
|
|
for_each_online_cpu(cpu) {
|
|
sysdev = get_cpu_sysdev(cpu);
|
|
kobject_uevent(&sysdev->kobj, KOBJ_CHANGE);
|
|
}
|
|
unlock_cpu_hotplug();
|
|
}
|
|
|
|
static void sclp_conf_receiver_fn(struct evbuf_header *evbuf)
|
|
{
|
|
struct conf_mgm_data *cdata;
|
|
|
|
cdata = (struct conf_mgm_data *)(evbuf + 1);
|
|
if (cdata->ev_qualifier == EV_QUAL_CAP_CHANGE)
|
|
schedule_work(&sclp_cpu_capability_work);
|
|
}
|
|
|
|
static struct sclp_register sclp_conf_register =
|
|
{
|
|
.receive_mask = EVTYP_CONFMGMDATA_MASK,
|
|
.receiver_fn = sclp_conf_receiver_fn,
|
|
};
|
|
|
|
static int __init sclp_conf_init(void)
|
|
{
|
|
int rc;
|
|
|
|
INIT_WORK(&sclp_cpu_capability_work, sclp_cpu_capability_notify);
|
|
|
|
rc = sclp_register(&sclp_conf_register);
|
|
if (rc) {
|
|
printk(KERN_ERR TAG "failed to register (%d).\n", rc);
|
|
return rc;
|
|
}
|
|
|
|
if (!(sclp_conf_register.sclp_receive_mask & EVTYP_CONFMGMDATA_MASK)) {
|
|
printk(KERN_WARNING TAG "no configuration management.\n");
|
|
sclp_unregister(&sclp_conf_register);
|
|
rc = -ENOSYS;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
__initcall(sclp_conf_init);
|