| /* |
| * 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/kthread.h> |
| #include <linux/sysdev.h> |
| #include <linux/workqueue.h> |
| #include <asm/smp.h> |
| #include "sclp.h" |
| |
| #define TAG "sclp_config: " |
| |
| 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 sys_device *sysdev; |
| |
| printk(KERN_WARNING TAG "cpu capability changed.\n"); |
| get_online_cpus(); |
| for_each_online_cpu(cpu) { |
| sysdev = get_cpu_sysdev(cpu); |
| kobject_uevent(&sysdev->kobj, KOBJ_CHANGE); |
| } |
| put_online_cpus(); |
| } |
| |
| static int sclp_cpu_kthread(void *data) |
| { |
| smp_rescan_cpus(); |
| return 0; |
| } |
| |
| static void __ref sclp_cpu_change_notify(struct work_struct *work) |
| { |
| /* Can't call smp_rescan_cpus() from workqueue context since it may |
| * deadlock in case of cpu hotplug. So we have to create a kernel |
| * thread in order to call it. |
| */ |
| kthread_run(sclp_cpu_kthread, NULL, "cpu_rescan"); |
| } |
| |
| 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) |
| { |
| int rc; |
| |
| INIT_WORK(&sclp_cpu_capability_work, sclp_cpu_capability_notify); |
| INIT_WORK(&sclp_cpu_change_work, sclp_cpu_change_notify); |
| |
| rc = sclp_register(&sclp_conf_register); |
| if (rc) |
| return rc; |
| |
| if (!(sclp_conf_register.sclp_send_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); |