Commit 2fc2d1e9 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky

[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: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
parent db77aa5f
......@@ -821,19 +821,57 @@ int setup_profiling_timer(unsigned int multiplier)
static DEFINE_PER_CPU(struct cpu, cpu_devices);
static ssize_t show_capability(struct sys_device *dev, char *buf)
{
unsigned int capability;
int rc;
rc = get_cpu_capability(&capability);
if (rc)
return rc;
return sprintf(buf, "%u\n", capability);
}
static SYSDEV_ATTR(capability, 0444, show_capability, NULL);
static int __cpuinit smp_cpu_notify(struct notifier_block *self,
unsigned long action, void *hcpu)
{
unsigned int cpu = (unsigned int)(long)hcpu;
struct cpu *c = &per_cpu(cpu_devices, cpu);
struct sys_device *s = &c->sysdev;
switch (action) {
case CPU_ONLINE:
if (sysdev_create_file(s, &attr_capability))
return NOTIFY_BAD;
break;
case CPU_DEAD:
sysdev_remove_file(s, &attr_capability);
break;
}
return NOTIFY_OK;
}
static struct notifier_block __cpuinitdata smp_cpu_nb = {
.notifier_call = smp_cpu_notify,
};
static int __init topology_init(void)
{
int cpu;
int ret;
register_cpu_notifier(&smp_cpu_nb);
for_each_possible_cpu(cpu) {
struct cpu *c = &per_cpu(cpu_devices, cpu);
struct sys_device *s = &c->sysdev;
c->hotpluggable = 1;
ret = register_cpu(c, cpu);
if (ret)
printk(KERN_WARNING "topology_init: register_cpu %d "
"failed (%d)\n", cpu, ret);
register_cpu(c, cpu);
if (!cpu_online(cpu))
continue;
s = &c->sysdev;
sysdev_create_file(s, &attr_capability);
}
return 0;
}
......
......@@ -3,7 +3,7 @@
#
obj-y += ctrlchar.o keyboard.o defkeymap.o sclp.o sclp_rw.o sclp_quiesce.o \
sclp_info.o sclp_chp.o
sclp_info.o sclp_config.o sclp_chp.o
obj-$(CONFIG_TN3270) += raw3270.o
obj-$(CONFIG_TN3270_CONSOLE) += con3270.o
......
......@@ -27,6 +27,7 @@
#define EVTYP_CNTLPROGIDENT 0x0B
#define EVTYP_SIGQUIESCE 0x1D
#define EVTYP_VT220MSG 0x1A
#define EVTYP_CONFMGMDATA 0x04
#define EVTYP_SDIAS 0x1C
#define EVTYP_OPCMD_MASK 0x80000000
......@@ -37,6 +38,7 @@
#define EVTYP_CTLPROGIDENT_MASK 0x00200000
#define EVTYP_SIGQUIESCE_MASK 0x00000008
#define EVTYP_VT220MSG_MASK 0x00000040
#define EVTYP_CONFMGMDATA_MASK 0x10000000
#define EVTYP_SDIAS_MASK 0x00000010
#define GNRLMSGFLGS_DOM 0x8000
......
/*
* 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);
......@@ -357,6 +357,24 @@ static __init int create_proc_sysinfo(void)
__initcall(create_proc_sysinfo);
int get_cpu_capability(unsigned int *capability)
{
struct sysinfo_1_2_2 *info;
int rc;
info = (void *) get_zeroed_page(GFP_KERNEL);
if (!info)
return -ENOMEM;
rc = stsi(info, 1, 2, 2);
if (rc == -ENOSYS)
goto out;
rc = 0;
*capability = info->capability;
out:
free_page((unsigned long) info);
return rc;
}
/*
* CPU capability might have changed. Therefore recalculate loops_per_jiffy.
*/
......
......@@ -57,6 +57,7 @@ struct cpuinfo_S390
extern void s390_adjust_jiffies(void);
extern void print_cpu_info(struct cpuinfo_S390 *);
extern int get_cpu_capability(unsigned int *);
/* Lazy FPU handling on uni-processor */
extern struct task_struct *last_task_used_math;
......
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