1 /* 2 * Copyright IBM Corp. 2007 3 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com> 4 */ 5 6 #define KMSG_COMPONENT "sclp_config" 7 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 8 9 #include <linux/init.h> 10 #include <linux/errno.h> 11 #include <linux/cpu.h> 12 #include <linux/device.h> 13 #include <linux/workqueue.h> 14 #include <asm/smp.h> 15 16 #include "sclp.h" 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 device *dev; 33 34 s390_adjust_jiffies(); 35 pr_warning("cpu capability changed.\n"); 36 get_online_cpus(); 37 for_each_online_cpu(cpu) { 38 dev = get_cpu_device(cpu); 39 kobject_uevent(&dev->kobj, KOBJ_CHANGE); 40 } 41 put_online_cpus(); 42 } 43 44 static void __ref sclp_cpu_change_notify(struct work_struct *work) 45 { 46 smp_rescan_cpus(); 47 } 48 49 static void sclp_conf_receiver_fn(struct evbuf_header *evbuf) 50 { 51 struct conf_mgm_data *cdata; 52 53 cdata = (struct conf_mgm_data *)(evbuf + 1); 54 switch (cdata->ev_qualifier) { 55 case EV_QUAL_CPU_CHANGE: 56 schedule_work(&sclp_cpu_change_work); 57 break; 58 case EV_QUAL_CAP_CHANGE: 59 schedule_work(&sclp_cpu_capability_work); 60 break; 61 } 62 } 63 64 static struct sclp_register sclp_conf_register = 65 { 66 .receive_mask = EVTYP_CONFMGMDATA_MASK, 67 .receiver_fn = sclp_conf_receiver_fn, 68 }; 69 70 static int __init sclp_conf_init(void) 71 { 72 INIT_WORK(&sclp_cpu_capability_work, sclp_cpu_capability_notify); 73 INIT_WORK(&sclp_cpu_change_work, sclp_cpu_change_notify); 74 return sclp_register(&sclp_conf_register); 75 } 76 77 __initcall(sclp_conf_init); 78