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