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 sclp_cpu_capability_notify(struct work_struct * work)29static void sclp_cpu_capability_notify(struct work_struct *work) 30 { 31 int cpu; 32 struct device *dev; 33 34 s390_adjust_jiffies(); 35 pr_info("CPU capability may have 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 sclp_cpu_change_notify(struct work_struct * work)44static void __ref sclp_cpu_change_notify(struct work_struct *work) 45 { 46 lock_device_hotplug(); 47 smp_rescan_cpus(); 48 unlock_device_hotplug(); 49 } 50 sclp_conf_receiver_fn(struct evbuf_header * evbuf)51static 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 sclp_conf_init(void)72static 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