LXR linux/drivers/s390/char/sclp

   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#define KMSG_COMPONENT "sclp_config"
   9#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  10
  11#include <linux/init.h>
  12#include <linux/errno.h>
  13#include <linux/cpu.h>
  14#include <linux/sysdev.h>
  15#include <linux/workqueue.h>
  16#include <asm/smp.h>
  17
  18#include "sclp.h"
  19
  20struct conf_mgm_data {
  21        u8 reserved;
  22        u8 ev_qualifier;
  23} __attribute__((packed));
  24
  25#define EV_QUAL_CPU_CHANGE      1
  26#define EV_QUAL_CAP_CHANGE      3
  27
  28static struct work_struct sclp_cpu_capability_work;
  29static struct work_struct sclp_cpu_change_work;
  30
  31static void sclp_cpu_capability_notify(struct work_struct *work)
  32{
  33        int cpu;
  34        struct sys_device *sysdev;
  35
  36        s390_adjust_jiffies();
  37        pr_warning("cpu capability changed.\n");
  38        get_online_cpus();
  39        for_each_online_cpu(cpu) {
  40                sysdev = get_cpu_sysdev(cpu);
  41                kobject_uevent(&sysdev->kobj, KOBJ_CHANGE);
  42        }
  43        put_online_cpus();
  44}
  45
  46static void __ref sclp_cpu_change_notify(struct work_struct *work)
  47{
  48        smp_rescan_cpus();
  49}
  50
  51static void sclp_conf_receiver_fn(struct evbuf_header *evbuf)
  52{
  53        struct conf_mgm_data *cdata;
  54
  55        cdata = (struct conf_mgm_data *)(evbuf + 1);
  56        switch (cdata->ev_qualifier) {
  57        case EV_QUAL_CPU_CHANGE:
  58                schedule_work(&sclp_cpu_change_work);
  59                break;
  60        case EV_QUAL_CAP_CHANGE:
  61                schedule_work(&sclp_cpu_capability_work);
  62                break;
  63        }
  64}
  65
  66static struct sclp_register sclp_conf_register =
  67{
  68        .receive_mask = EVTYP_CONFMGMDATA_MASK,
  69        .receiver_fn  = sclp_conf_receiver_fn,
  70};
  71
  72static int __init sclp_conf_init(void)
  73{
  74        int rc;
  75
  76        INIT_WORK(&sclp_cpu_capability_work, sclp_cpu_capability_notify);
  77        INIT_WORK(&sclp_cpu_change_work, sclp_cpu_change_notify);
  78
  79        rc = sclp_register(&sclp_conf_register);
  80        if (rc)
  81                return rc;
  82
  83        if (!(sclp_conf_register.sclp_send_mask & EVTYP_CONFMGMDATA_MASK)) {
  84                pr_warning("no configuration management.\n");
  85                sclp_unregister(&sclp_conf_register);
  86                rc = -ENOSYS;
  87        }
  88        return rc;
  89}
  90
  91__initcall(sclp_conf_init);
  92