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 20 struct 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 28 static struct work_struct sclp_cpu_capability_work; 29 static struct work_struct sclp_cpu_change_work; 30 31 static 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 46 static void __ref sclp_cpu_change_notify(struct work_struct *work) 47 { 48 smp_rescan_cpus(); 49 } 50 51 static 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 66 static struct sclp_register sclp_conf_register = 67 { 68 .receive_mask = EVTYP_CONFMGMDATA_MASK, 69 .receiver_fn = sclp_conf_receiver_fn, 70 }; 71 72 static int __init sclp_conf_init(void) 73 { 74 INIT_WORK(&sclp_cpu_capability_work, sclp_cpu_capability_notify); 75 INIT_WORK(&sclp_cpu_change_work, sclp_cpu_change_notify); 76 return sclp_register(&sclp_conf_register); 77 } 78 79 __initcall(sclp_conf_init); 80