1 /* 2 * zfcp device driver 3 * 4 * Registration and callback for the s390 common I/O layer. 5 * 6 * Copyright IBM Corporation 2002, 2009 7 */ 8 9 #define KMSG_COMPONENT "zfcp" 10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 11 12 #include "zfcp_ext.h" 13 14 /** 15 * zfcp_ccw_probe - probe function of zfcp driver 16 * @ccw_device: pointer to belonging ccw device 17 * 18 * This function gets called by the common i/o layer and sets up the initial 19 * data structures for each fcp adapter, which was detected by the system. 20 * Also the sysfs files for this adapter will be created by this function. 21 * In addition the nameserver port will be added to the ports of the adapter 22 * and its sysfs representation will be created too. 23 */ 24 static int zfcp_ccw_probe(struct ccw_device *ccw_device) 25 { 26 int retval = 0; 27 28 down(&zfcp_data.config_sema); 29 if (zfcp_adapter_enqueue(ccw_device)) { 30 dev_err(&ccw_device->dev, 31 "Setting up data structures for the " 32 "FCP adapter failed\n"); 33 retval = -EINVAL; 34 } 35 up(&zfcp_data.config_sema); 36 return retval; 37 } 38 39 /** 40 * zfcp_ccw_remove - remove function of zfcp driver 41 * @ccw_device: pointer to belonging ccw device 42 * 43 * This function gets called by the common i/o layer and removes an adapter 44 * from the system. Task of this function is to get rid of all units and 45 * ports that belong to this adapter. And in addition all resources of this 46 * adapter will be freed too. 47 */ 48 static void zfcp_ccw_remove(struct ccw_device *ccw_device) 49 { 50 struct zfcp_adapter *adapter; 51 struct zfcp_port *port, *p; 52 struct zfcp_unit *unit, *u; 53 LIST_HEAD(unit_remove_lh); 54 LIST_HEAD(port_remove_lh); 55 56 ccw_device_set_offline(ccw_device); 57 down(&zfcp_data.config_sema); 58 adapter = dev_get_drvdata(&ccw_device->dev); 59 60 write_lock_irq(&zfcp_data.config_lock); 61 list_for_each_entry_safe(port, p, &adapter->port_list_head, list) { 62 list_for_each_entry_safe(unit, u, &port->unit_list_head, list) { 63 list_move(&unit->list, &unit_remove_lh); 64 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, 65 &unit->status); 66 } 67 list_move(&port->list, &port_remove_lh); 68 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status); 69 } 70 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status); 71 write_unlock_irq(&zfcp_data.config_lock); 72 73 list_for_each_entry_safe(port, p, &port_remove_lh, list) { 74 list_for_each_entry_safe(unit, u, &unit_remove_lh, list) { 75 if (unit->device) 76 scsi_remove_device(unit->device); 77 zfcp_unit_dequeue(unit); 78 } 79 zfcp_port_dequeue(port); 80 } 81 wait_event(adapter->remove_wq, atomic_read(&adapter->refcount) == 0); 82 zfcp_adapter_dequeue(adapter); 83 84 up(&zfcp_data.config_sema); 85 } 86 87 /** 88 * zfcp_ccw_set_online - set_online function of zfcp driver 89 * @ccw_device: pointer to belonging ccw device 90 * 91 * This function gets called by the common i/o layer and sets an adapter 92 * into state online. Setting an fcp device online means that it will be 93 * registered with the SCSI stack, that the QDIO queues will be set up 94 * and that the adapter will be opened (asynchronously). 95 */ 96 static int zfcp_ccw_set_online(struct ccw_device *ccw_device) 97 { 98 struct zfcp_adapter *adapter; 99 int retval; 100 101 down(&zfcp_data.config_sema); 102 adapter = dev_get_drvdata(&ccw_device->dev); 103 104 retval = zfcp_erp_thread_setup(adapter); 105 if (retval) 106 goto out; 107 108 /* initialize request counter */ 109 BUG_ON(!zfcp_reqlist_isempty(adapter)); 110 adapter->req_no = 0; 111 112 zfcp_erp_modify_adapter_status(adapter, "ccsonl1", NULL, 113 ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET); 114 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, 115 "ccsonl2", NULL); 116 zfcp_erp_wait(adapter); 117 up(&zfcp_data.config_sema); 118 flush_work(&adapter->scan_work); 119 return 0; 120 121 out: 122 up(&zfcp_data.config_sema); 123 return retval; 124 } 125 126 /** 127 * zfcp_ccw_set_offline - set_offline function of zfcp driver 128 * @ccw_device: pointer to belonging ccw device 129 * 130 * This function gets called by the common i/o layer and sets an adapter 131 * into state offline. 132 */ 133 static int zfcp_ccw_set_offline(struct ccw_device *ccw_device) 134 { 135 struct zfcp_adapter *adapter; 136 137 down(&zfcp_data.config_sema); 138 adapter = dev_get_drvdata(&ccw_device->dev); 139 zfcp_erp_adapter_shutdown(adapter, 0, "ccsoff1", NULL); 140 zfcp_erp_wait(adapter); 141 zfcp_erp_thread_kill(adapter); 142 up(&zfcp_data.config_sema); 143 return 0; 144 } 145 146 /** 147 * zfcp_ccw_notify - ccw notify function 148 * @ccw_device: pointer to belonging ccw device 149 * @event: indicates if adapter was detached or attached 150 * 151 * This function gets called by the common i/o layer if an adapter has gone 152 * or reappeared. 153 */ 154 static int zfcp_ccw_notify(struct ccw_device *ccw_device, int event) 155 { 156 struct zfcp_adapter *adapter = dev_get_drvdata(&ccw_device->dev); 157 158 switch (event) { 159 case CIO_GONE: 160 dev_warn(&adapter->ccw_device->dev, 161 "The FCP device has been detached\n"); 162 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti1", NULL); 163 break; 164 case CIO_NO_PATH: 165 dev_warn(&adapter->ccw_device->dev, 166 "The CHPID for the FCP device is offline\n"); 167 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti2", NULL); 168 break; 169 case CIO_OPER: 170 dev_info(&adapter->ccw_device->dev, 171 "The FCP device is operational again\n"); 172 zfcp_erp_modify_adapter_status(adapter, "ccnoti3", NULL, 173 ZFCP_STATUS_COMMON_RUNNING, 174 ZFCP_SET); 175 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, 176 "ccnoti4", NULL); 177 break; 178 case CIO_BOXED: 179 dev_warn(&adapter->ccw_device->dev, 180 "The ccw device did not respond in time.\n"); 181 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5", NULL); 182 break; 183 } 184 return 1; 185 } 186 187 /** 188 * zfcp_ccw_shutdown - handle shutdown from cio 189 * @cdev: device for adapter to shutdown. 190 */ 191 static void zfcp_ccw_shutdown(struct ccw_device *cdev) 192 { 193 struct zfcp_adapter *adapter; 194 195 down(&zfcp_data.config_sema); 196 adapter = dev_get_drvdata(&cdev->dev); 197 zfcp_erp_adapter_shutdown(adapter, 0, "ccshut1", NULL); 198 zfcp_erp_wait(adapter); 199 up(&zfcp_data.config_sema); 200 } 201 202 static struct ccw_device_id zfcp_ccw_device_id[] = { 203 { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) }, 204 { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x4) }, /* priv. */ 205 {}, 206 }; 207 208 MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id); 209 210 static struct ccw_driver zfcp_ccw_driver = { 211 .owner = THIS_MODULE, 212 .name = "zfcp", 213 .ids = zfcp_ccw_device_id, 214 .probe = zfcp_ccw_probe, 215 .remove = zfcp_ccw_remove, 216 .set_online = zfcp_ccw_set_online, 217 .set_offline = zfcp_ccw_set_offline, 218 .notify = zfcp_ccw_notify, 219 .shutdown = zfcp_ccw_shutdown, 220 }; 221 222 /** 223 * zfcp_ccw_register - ccw register function 224 * 225 * Registers the driver at the common i/o layer. This function will be called 226 * at module load time/system start. 227 */ 228 int __init zfcp_ccw_register(void) 229 { 230 return ccw_driver_register(&zfcp_ccw_driver); 231 } 232 233 /** 234 * zfcp_get_adapter_by_busid - find zfcp_adapter struct 235 * @busid: bus id string of zfcp adapter to find 236 */ 237 struct zfcp_adapter *zfcp_get_adapter_by_busid(char *busid) 238 { 239 struct ccw_device *ccw_device; 240 struct zfcp_adapter *adapter = NULL; 241 242 ccw_device = get_ccwdev_by_busid(&zfcp_ccw_driver, busid); 243 if (ccw_device) { 244 adapter = dev_get_drvdata(&ccw_device->dev); 245 put_device(&ccw_device->dev); 246 } 247 return adapter; 248 } 249