1 /* 2 * This file is part of the zfcp device driver for 3 * FCP adapters for IBM System z9 and zSeries. 4 * 5 * (C) Copyright IBM Corp. 2002, 2006 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2, or (at your option) 10 * any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 */ 21 22 #include "zfcp_ext.h" 23 24 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_CONFIG 25 26 static int zfcp_ccw_probe(struct ccw_device *); 27 static void zfcp_ccw_remove(struct ccw_device *); 28 static int zfcp_ccw_set_online(struct ccw_device *); 29 static int zfcp_ccw_set_offline(struct ccw_device *); 30 static int zfcp_ccw_notify(struct ccw_device *, int); 31 static void zfcp_ccw_shutdown(struct ccw_device *); 32 33 static struct ccw_device_id zfcp_ccw_device_id[] = { 34 {CCW_DEVICE_DEVTYPE(ZFCP_CONTROL_UNIT_TYPE, 35 ZFCP_CONTROL_UNIT_MODEL, 36 ZFCP_DEVICE_TYPE, 37 ZFCP_DEVICE_MODEL)}, 38 {CCW_DEVICE_DEVTYPE(ZFCP_CONTROL_UNIT_TYPE, 39 ZFCP_CONTROL_UNIT_MODEL, 40 ZFCP_DEVICE_TYPE, 41 ZFCP_DEVICE_MODEL_PRIV)}, 42 {}, 43 }; 44 45 static struct ccw_driver zfcp_ccw_driver = { 46 .owner = THIS_MODULE, 47 .name = ZFCP_NAME, 48 .ids = zfcp_ccw_device_id, 49 .probe = zfcp_ccw_probe, 50 .remove = zfcp_ccw_remove, 51 .set_online = zfcp_ccw_set_online, 52 .set_offline = zfcp_ccw_set_offline, 53 .notify = zfcp_ccw_notify, 54 .shutdown = zfcp_ccw_shutdown, 55 }; 56 57 MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id); 58 59 /** 60 * zfcp_ccw_probe - probe function of zfcp driver 61 * @ccw_device: pointer to belonging ccw device 62 * 63 * This function gets called by the common i/o layer and sets up the initial 64 * data structures for each fcp adapter, which was detected by the system. 65 * Also the sysfs files for this adapter will be created by this function. 66 * In addition the nameserver port will be added to the ports of the adapter 67 * and its sysfs representation will be created too. 68 */ 69 static int 70 zfcp_ccw_probe(struct ccw_device *ccw_device) 71 { 72 struct zfcp_adapter *adapter; 73 int retval = 0; 74 75 down(&zfcp_data.config_sema); 76 adapter = zfcp_adapter_enqueue(ccw_device); 77 if (!adapter) 78 retval = -EINVAL; 79 else 80 ZFCP_LOG_DEBUG("Probed adapter %s\n", 81 zfcp_get_busid_by_adapter(adapter)); 82 up(&zfcp_data.config_sema); 83 return retval; 84 } 85 86 /** 87 * zfcp_ccw_remove - remove function of zfcp driver 88 * @ccw_device: pointer to belonging ccw device 89 * 90 * This function gets called by the common i/o layer and removes an adapter 91 * from the system. Task of this function is to get rid of all units and 92 * ports that belong to this adapter. And in addition all resources of this 93 * adapter will be freed too. 94 */ 95 static void 96 zfcp_ccw_remove(struct ccw_device *ccw_device) 97 { 98 struct zfcp_adapter *adapter; 99 struct zfcp_port *port, *p; 100 struct zfcp_unit *unit, *u; 101 102 ccw_device_set_offline(ccw_device); 103 down(&zfcp_data.config_sema); 104 adapter = dev_get_drvdata(&ccw_device->dev); 105 106 ZFCP_LOG_DEBUG("Removing adapter %s\n", 107 zfcp_get_busid_by_adapter(adapter)); 108 write_lock_irq(&zfcp_data.config_lock); 109 list_for_each_entry_safe(port, p, &adapter->port_list_head, list) { 110 list_for_each_entry_safe(unit, u, &port->unit_list_head, list) { 111 list_move(&unit->list, &port->unit_remove_lh); 112 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, 113 &unit->status); 114 } 115 list_move(&port->list, &adapter->port_remove_lh); 116 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status); 117 } 118 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status); 119 write_unlock_irq(&zfcp_data.config_lock); 120 121 list_for_each_entry_safe(port, p, &adapter->port_remove_lh, list) { 122 list_for_each_entry_safe(unit, u, &port->unit_remove_lh, list) { 123 zfcp_unit_dequeue(unit); 124 } 125 zfcp_port_dequeue(port); 126 } 127 zfcp_adapter_wait(adapter); 128 zfcp_adapter_dequeue(adapter); 129 130 up(&zfcp_data.config_sema); 131 } 132 133 /** 134 * zfcp_ccw_set_online - set_online function of zfcp driver 135 * @ccw_device: pointer to belonging ccw device 136 * 137 * This function gets called by the common i/o layer and sets an adapter 138 * into state online. Setting an fcp device online means that it will be 139 * registered with the SCSI stack, that the QDIO queues will be set up 140 * and that the adapter will be opened (asynchronously). 141 */ 142 static int 143 zfcp_ccw_set_online(struct ccw_device *ccw_device) 144 { 145 struct zfcp_adapter *adapter; 146 int retval; 147 148 down(&zfcp_data.config_sema); 149 adapter = dev_get_drvdata(&ccw_device->dev); 150 151 retval = zfcp_erp_thread_setup(adapter); 152 if (retval) { 153 ZFCP_LOG_INFO("error: start of error recovery thread for " 154 "adapter %s failed\n", 155 zfcp_get_busid_by_adapter(adapter)); 156 goto out; 157 } 158 159 retval = zfcp_adapter_scsi_register(adapter); 160 if (retval) 161 goto out_scsi_register; 162 163 /* initialize request counter */ 164 BUG_ON(!zfcp_reqlist_isempty(adapter)); 165 adapter->req_no = 0; 166 167 zfcp_erp_modify_adapter_status(adapter, ZFCP_STATUS_COMMON_RUNNING, 168 ZFCP_SET); 169 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED); 170 zfcp_erp_wait(adapter); 171 goto out; 172 173 out_scsi_register: 174 zfcp_erp_thread_kill(adapter); 175 out: 176 up(&zfcp_data.config_sema); 177 return retval; 178 } 179 180 /** 181 * zfcp_ccw_set_offline - set_offline function of zfcp driver 182 * @ccw_device: pointer to belonging ccw device 183 * 184 * This function gets called by the common i/o layer and sets an adapter 185 * into state offline. 186 */ 187 static int 188 zfcp_ccw_set_offline(struct ccw_device *ccw_device) 189 { 190 struct zfcp_adapter *adapter; 191 192 down(&zfcp_data.config_sema); 193 adapter = dev_get_drvdata(&ccw_device->dev); 194 zfcp_erp_adapter_shutdown(adapter, 0); 195 zfcp_erp_wait(adapter); 196 zfcp_erp_thread_kill(adapter); 197 up(&zfcp_data.config_sema); 198 return 0; 199 } 200 201 /** 202 * zfcp_ccw_notify 203 * @ccw_device: pointer to belonging ccw device 204 * @event: indicates if adapter was detached or attached 205 * 206 * This function gets called by the common i/o layer if an adapter has gone 207 * or reappeared. 208 */ 209 static int 210 zfcp_ccw_notify(struct ccw_device *ccw_device, int event) 211 { 212 struct zfcp_adapter *adapter; 213 214 down(&zfcp_data.config_sema); 215 adapter = dev_get_drvdata(&ccw_device->dev); 216 switch (event) { 217 case CIO_GONE: 218 ZFCP_LOG_NORMAL("adapter %s: device gone\n", 219 zfcp_get_busid_by_adapter(adapter)); 220 debug_text_event(adapter->erp_dbf,1,"dev_gone"); 221 zfcp_erp_adapter_shutdown(adapter, 0); 222 break; 223 case CIO_NO_PATH: 224 ZFCP_LOG_NORMAL("adapter %s: no path\n", 225 zfcp_get_busid_by_adapter(adapter)); 226 debug_text_event(adapter->erp_dbf,1,"no_path"); 227 zfcp_erp_adapter_shutdown(adapter, 0); 228 break; 229 case CIO_OPER: 230 ZFCP_LOG_NORMAL("adapter %s: operational again\n", 231 zfcp_get_busid_by_adapter(adapter)); 232 debug_text_event(adapter->erp_dbf,1,"dev_oper"); 233 zfcp_erp_modify_adapter_status(adapter, 234 ZFCP_STATUS_COMMON_RUNNING, 235 ZFCP_SET); 236 zfcp_erp_adapter_reopen(adapter, 237 ZFCP_STATUS_COMMON_ERP_FAILED); 238 break; 239 } 240 zfcp_erp_wait(adapter); 241 up(&zfcp_data.config_sema); 242 return 1; 243 } 244 245 /** 246 * zfcp_ccw_register - ccw register function 247 * 248 * Registers the driver at the common i/o layer. This function will be called 249 * at module load time/system start. 250 */ 251 int __init 252 zfcp_ccw_register(void) 253 { 254 int retval; 255 256 retval = ccw_driver_register(&zfcp_ccw_driver); 257 if (retval) 258 goto out; 259 retval = zfcp_sysfs_driver_create_files(&zfcp_ccw_driver.driver); 260 if (retval) 261 ccw_driver_unregister(&zfcp_ccw_driver); 262 out: 263 return retval; 264 } 265 266 /** 267 * zfcp_ccw_shutdown - gets called on reboot/shutdown 268 * 269 * Makes sure that QDIO queues are down when the system gets stopped. 270 */ 271 static void 272 zfcp_ccw_shutdown(struct ccw_device *cdev) 273 { 274 struct zfcp_adapter *adapter; 275 276 down(&zfcp_data.config_sema); 277 adapter = dev_get_drvdata(&cdev->dev); 278 zfcp_erp_adapter_shutdown(adapter, 0); 279 zfcp_erp_wait(adapter); 280 up(&zfcp_data.config_sema); 281 } 282 283 #undef ZFCP_LOG_AREA 284