sclp_config.c

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/*
 *    Copyright IBM Corp. 2007
 *    Author(s): Heiko Carstens <[email protected]>
 */

#define KMSG_COMPONENT "sclp_config"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/init.h>
#include <linux/errno.h>
#include <linux/cpu.h>
#include <linux/device.h>
#include <linux/workqueue.h>
#include <asm/smp.h>

#include "sclp.h"

struct conf_mgm_data {
    u8 reserved;
    u8 ev_qualifier;
} __attribute__((packed));

#define EV_QUAL_CPU_CHANGE  1
#define EV_QUAL_CAP_CHANGE  3

static struct work_struct sclp_cpu_capability_work;
static struct work_struct sclp_cpu_change_work;

static void sclp_cpu_capability_notify(struct work_struct *work)
{
    int cpu;
    struct device *dev;

    s390_adjust_jiffies();
    pr_warning("cpu capability changed.\n");
    get_online_cpus();
    for_each_online_cpu(cpu) {
        dev = get_cpu_device(cpu);
        kobject_uevent(&dev->kobj, KOBJ_CHANGE);
    }
    put_online_cpus();
}

static void __ref sclp_cpu_change_notify(struct work_struct *work)
{
    smp_rescan_cpus();
}

static void sclp_conf_receiver_fn(struct evbuf_header *evbuf)
{
    struct conf_mgm_data *cdata;

    cdata = (struct conf_mgm_data *)(evbuf + 1);
    switch (cdata->ev_qualifier) {
    case EV_QUAL_CPU_CHANGE:
        schedule_work(&sclp_cpu_change_work);
        break;
    case EV_QUAL_CAP_CHANGE:
        schedule_work(&sclp_cpu_capability_work);
        break;
    }
}

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)
{
    INIT_WORK(&sclp_cpu_capability_work, sclp_cpu_capability_notify);
    INIT_WORK(&sclp_cpu_change_work, sclp_cpu_change_notify);
    return sclp_register(&sclp_conf_register);
}

__initcall(sclp_conf_init);