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 pr_warning("cpu capability changed.\n"); 37 get_online_cpus(); 38 for_each_online_cpu(cpu) { 39 sysdev = get_cpu_sysdev(cpu); 40 kobject_uevent(&sysdev->kobj, KOBJ_CHANGE); 41 } 42 put_online_cpus(); 43 } 44 45 static void __ref sclp_cpu_change_notify(struct work_struct *work) 46 { 47 smp_rescan_cpus(); 48 } 49 50 static void sclp_conf_receiver_fn(struct evbuf_header *evbuf) 51 { 52 struct conf_mgm_data *cdata; 53 54 cdata = (struct conf_mgm_data *)(evbuf + 1); 55 switch (cdata->ev_qualifier) { 56 case EV_QUAL_CPU_CHANGE: 57 schedule_work(&sclp_cpu_change_work); 58 break; 59 case EV_QUAL_CAP_CHANGE: 60 schedule_work(&sclp_cpu_capability_work); 61 break; 62 } 63 } 64 65 static struct sclp_register sclp_conf_register = 66 { 67 .receive_mask = EVTYP_CONFMGMDATA_MASK, 68 .receiver_fn = sclp_conf_receiver_fn, 69 }; 70 71 static int __init sclp_conf_init(void) 72 { 73 int rc; 74 75 INIT_WORK(&sclp_cpu_capability_work, sclp_cpu_capability_notify); 76 INIT_WORK(&sclp_cpu_change_work, sclp_cpu_change_notify); 77 78 rc = sclp_register(&sclp_conf_register); 79 if (rc) 80 return rc; 81 82 if (!(sclp_conf_register.sclp_send_mask & EVTYP_CONFMGMDATA_MASK)) { 83 pr_warning("no configuration management.\n"); 84 sclp_unregister(&sclp_conf_register); 85 rc = -ENOSYS; 86 } 87 return rc; 88 } 89 90 __initcall(sclp_conf_init); 91