drivers/s390/char/sclp_config.c

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