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 <linux/slab.h> 15 #include <linux/sysfs.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 OFB_DATA_MAX 64 26 27 struct sclp_ofb_evbuf { 28 struct evbuf_header header; 29 struct conf_mgm_data cm_data; 30 char ev_data[OFB_DATA_MAX]; 31 } __packed; 32 33 struct sclp_ofb_sccb { 34 struct sccb_header header; 35 struct sclp_ofb_evbuf ofb_evbuf; 36 } __packed; 37 38 #define EV_QUAL_CPU_CHANGE 1 39 #define EV_QUAL_CAP_CHANGE 3 40 #define EV_QUAL_OPEN4BUSINESS 5 41 42 static struct work_struct sclp_cpu_capability_work; 43 static struct work_struct sclp_cpu_change_work; 44 45 static void sclp_cpu_capability_notify(struct work_struct *work) 46 { 47 int cpu; 48 struct device *dev; 49 50 s390_update_cpu_mhz(); 51 pr_info("CPU capability may have changed\n"); 52 get_online_cpus(); 53 for_each_online_cpu(cpu) { 54 dev = get_cpu_device(cpu); 55 kobject_uevent(&dev->kobj, KOBJ_CHANGE); 56 } 57 put_online_cpus(); 58 } 59 60 static void __ref sclp_cpu_change_notify(struct work_struct *work) 61 { 62 smp_rescan_cpus(); 63 } 64 65 static void sclp_conf_receiver_fn(struct evbuf_header *evbuf) 66 { 67 struct conf_mgm_data *cdata; 68 69 cdata = (struct conf_mgm_data *)(evbuf + 1); 70 switch (cdata->ev_qualifier) { 71 case EV_QUAL_CPU_CHANGE: 72 schedule_work(&sclp_cpu_change_work); 73 break; 74 case EV_QUAL_CAP_CHANGE: 75 schedule_work(&sclp_cpu_capability_work); 76 break; 77 } 78 } 79 80 static struct sclp_register sclp_conf_register = 81 { 82 #ifdef CONFIG_SCLP_OFB 83 .send_mask = EVTYP_CONFMGMDATA_MASK, 84 #endif 85 .receive_mask = EVTYP_CONFMGMDATA_MASK, 86 .receiver_fn = sclp_conf_receiver_fn, 87 }; 88 89 #ifdef CONFIG_SCLP_OFB 90 static int sclp_ofb_send_req(char *ev_data, size_t len) 91 { 92 static DEFINE_MUTEX(send_mutex); 93 struct sclp_ofb_sccb *sccb; 94 int rc, response; 95 96 if (len > OFB_DATA_MAX) 97 return -EINVAL; 98 sccb = (struct sclp_ofb_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 99 if (!sccb) 100 return -ENOMEM; 101 /* Setup SCCB for Control-Program Identification */ 102 sccb->header.length = sizeof(struct sclp_ofb_sccb); 103 sccb->ofb_evbuf.header.length = sizeof(struct sclp_ofb_evbuf); 104 sccb->ofb_evbuf.header.type = EVTYP_CONFMGMDATA; 105 sccb->ofb_evbuf.cm_data.ev_qualifier = EV_QUAL_OPEN4BUSINESS; 106 memcpy(sccb->ofb_evbuf.ev_data, ev_data, len); 107 108 if (!(sclp_conf_register.sclp_receive_mask & EVTYP_CONFMGMDATA_MASK)) 109 pr_warn("SCLP receiver did not register to receive " 110 "Configuration Management Data Events.\n"); 111 112 mutex_lock(&send_mutex); 113 rc = sclp_sync_request(SCLP_CMDW_WRITE_EVENT_DATA, sccb); 114 mutex_unlock(&send_mutex); 115 if (rc) 116 goto out; 117 response = sccb->header.response_code; 118 if (response != 0x0020) { 119 pr_err("Open for Business request failed with response code " 120 "0x%04x\n", response); 121 rc = -EIO; 122 } 123 out: 124 free_page((unsigned long)sccb); 125 return rc; 126 } 127 128 static ssize_t sysfs_ofb_data_write(struct file *filp, struct kobject *kobj, 129 struct bin_attribute *bin_attr, 130 char *buf, loff_t off, size_t count) 131 { 132 int rc; 133 134 rc = sclp_ofb_send_req(buf, count); 135 return rc ?: count; 136 } 137 138 static struct bin_attribute ofb_bin_attr = { 139 .attr = { 140 .name = "event_data", 141 .mode = S_IWUSR, 142 }, 143 .write = sysfs_ofb_data_write, 144 }; 145 #endif 146 147 static int __init sclp_ofb_setup(void) 148 { 149 #ifdef CONFIG_SCLP_OFB 150 struct kset *ofb_kset; 151 int rc; 152 153 ofb_kset = kset_create_and_add("ofb", NULL, firmware_kobj); 154 if (!ofb_kset) 155 return -ENOMEM; 156 rc = sysfs_create_bin_file(&ofb_kset->kobj, &ofb_bin_attr); 157 if (rc) { 158 kset_unregister(ofb_kset); 159 return rc; 160 } 161 #endif 162 return 0; 163 } 164 165 static int __init sclp_conf_init(void) 166 { 167 int rc; 168 169 INIT_WORK(&sclp_cpu_capability_work, sclp_cpu_capability_notify); 170 INIT_WORK(&sclp_cpu_change_work, sclp_cpu_change_notify); 171 rc = sclp_register(&sclp_conf_register); 172 if (rc) 173 return rc; 174 return sclp_ofb_setup(); 175 } 176 177 __initcall(sclp_conf_init); 178