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 26static int zfcp_ccw_probe(struct ccw_device *); 27static void zfcp_ccw_remove(struct ccw_device *); 28static int zfcp_ccw_set_online(struct ccw_device *); 29static int zfcp_ccw_set_offline(struct ccw_device *); 30static int zfcp_ccw_notify(struct ccw_device *, int); 31static void zfcp_ccw_shutdown(struct device *); 32 33static 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 45static 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 .driver = { 55 .shutdown = zfcp_ccw_shutdown, 56 }, 57}; 58 59MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id); 60 61/** 62 * zfcp_ccw_probe - probe function of zfcp driver 63 * @ccw_device: pointer to belonging ccw device 64 * 65 * This function gets called by the common i/o layer and sets up the initial 66 * data structures for each fcp adapter, which was detected by the system. 67 * Also the sysfs files for this adapter will be created by this function. 68 * In addition the nameserver port will be added to the ports of the adapter 69 * and its sysfs representation will be created too. 70 */ 71static int 72zfcp_ccw_probe(struct ccw_device *ccw_device) 73{ 74 struct zfcp_adapter *adapter; 75 int retval = 0; 76 77 down(&zfcp_data.config_sema); 78 adapter = zfcp_adapter_enqueue(ccw_device); 79 if (!adapter) 80 retval = -EINVAL; 81 else 82 ZFCP_LOG_DEBUG("Probed adapter %s\n", 83 zfcp_get_busid_by_adapter(adapter)); 84 up(&zfcp_data.config_sema); 85 return retval; 86} 87 88/** 89 * zfcp_ccw_remove - remove function of zfcp driver 90 * @ccw_device: pointer to belonging ccw device 91 * 92 * This function gets called by the common i/o layer and removes an adapter 93 * from the system. Task of this function is to get rid of all units and 94 * ports that belong to this adapter. And in addition all resources of this 95 * adapter will be freed too. 96 */ 97static void 98zfcp_ccw_remove(struct ccw_device *ccw_device) 99{ 100 struct zfcp_adapter *adapter; 101 struct zfcp_port *port, *p; 102 struct zfcp_unit *unit, *u; 103 104 ccw_device_set_offline(ccw_device); 105 down(&zfcp_data.config_sema); 106 adapter = dev_get_drvdata(&ccw_device->dev); 107 108 ZFCP_LOG_DEBUG("Removing adapter %s\n", 109 zfcp_get_busid_by_adapter(adapter)); 110 write_lock_irq(&zfcp_data.config_lock); 111 list_for_each_entry_safe(port, p, &adapter->port_list_head, list) { 112 list_for_each_entry_safe(unit, u, &port->unit_list_head, list) { 113 list_move(&unit->list, &port->unit_remove_lh); 114 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, 115 &unit->status); 116 } 117 list_move(&port->list, &adapter->port_remove_lh); 118 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status); 119 } 120 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status); 121 write_unlock_irq(&zfcp_data.config_lock); 122 123 list_for_each_entry_safe(port, p, &adapter->port_remove_lh, list) { 124 list_for_each_entry_safe(unit, u, &port->unit_remove_lh, list) { 125 zfcp_unit_dequeue(unit); 126 } 127 zfcp_port_dequeue(port); 128 } 129 zfcp_adapter_wait(adapter); 130 zfcp_adapter_dequeue(adapter); 131 132 up(&zfcp_data.config_sema); 133} 134 135/** 136 * zfcp_ccw_set_online - set_online function of zfcp driver 137 * @ccw_device: pointer to belonging ccw device 138 * 139 * This function gets called by the common i/o layer and sets an adapter 140 * into state online. Setting an fcp device online means that it will be 141 * registered with the SCSI stack, that the QDIO queues will be set up 142 * and that the adapter will be opened (asynchronously). 143 */ 144static int 145zfcp_ccw_set_online(struct ccw_device *ccw_device) 146{ 147 struct zfcp_adapter *adapter; 148 int retval; 149 150 down(&zfcp_data.config_sema); 151 adapter = dev_get_drvdata(&ccw_device->dev); 152 153 retval = zfcp_adapter_debug_register(adapter); 154 if (retval) 155 goto out; 156 retval = zfcp_erp_thread_setup(adapter); 157 if (retval) { 158 ZFCP_LOG_INFO("error: start of error recovery thread for " 159 "adapter %s failed\n", 160 zfcp_get_busid_by_adapter(adapter)); 161 goto out_erp_thread; 162 } 163 164 retval = zfcp_adapter_scsi_register(adapter); 165 if (retval) 166 goto out_scsi_register; 167 168 /* initialize request counter */ 169 BUG_ON(!zfcp_reqlist_isempty(adapter)); 170 adapter->req_no = 0; 171 172 zfcp_erp_modify_adapter_status(adapter, ZFCP_STATUS_COMMON_RUNNING, 173 ZFCP_SET); 174 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED); 175 zfcp_erp_wait(adapter); 176 goto out; 177 178 out_scsi_register: 179 zfcp_erp_thread_kill(adapter); 180 out_erp_thread: 181 zfcp_adapter_debug_unregister(adapter); 182 out: 183 up(&zfcp_data.config_sema); 184 return retval; 185} 186 187/** 188 * zfcp_ccw_set_offline - set_offline function of zfcp driver 189 * @ccw_device: pointer to belonging ccw device 190 * 191 * This function gets called by the common i/o layer and sets an adapter 192 * into state offline. 193 */ 194static int 195zfcp_ccw_set_offline(struct ccw_device *ccw_device) 196{ 197 struct zfcp_adapter *adapter; 198 199 down(&zfcp_data.config_sema); 200 adapter = dev_get_drvdata(&ccw_device->dev); 201 zfcp_erp_adapter_shutdown(adapter, 0); 202 zfcp_erp_wait(adapter); 203 zfcp_erp_thread_kill(adapter); 204 zfcp_adapter_debug_unregister(adapter); 205 up(&zfcp_data.config_sema); 206 return 0; 207} 208 209/** 210 * zfcp_ccw_notify 211 * @ccw_device: pointer to belonging ccw device 212 * @event: indicates if adapter was detached or attached 213 * 214 * This function gets called by the common i/o layer if an adapter has gone 215 * or reappeared. 216 */ 217static int 218zfcp_ccw_notify(struct ccw_device *ccw_device, int event) 219{ 220 struct zfcp_adapter *adapter; 221 222 down(&zfcp_data.config_sema); 223 adapter = dev_get_drvdata(&ccw_device->dev); 224 switch (event) { 225 case CIO_GONE: 226 ZFCP_LOG_NORMAL("adapter %s: device gone\n", 227 zfcp_get_busid_by_adapter(adapter)); 228 debug_text_event(adapter->erp_dbf,1,"dev_gone"); 229 zfcp_erp_adapter_shutdown(adapter, 0); 230 break; 231 case CIO_NO_PATH: 232 ZFCP_LOG_NORMAL("adapter %s: no path\n", 233 zfcp_get_busid_by_adapter(adapter)); 234 debug_text_event(adapter->erp_dbf,1,"no_path"); 235 zfcp_erp_adapter_shutdown(adapter, 0); 236 break; 237 case CIO_OPER: 238 ZFCP_LOG_NORMAL("adapter %s: operational again\n", 239 zfcp_get_busid_by_adapter(adapter)); 240 debug_text_event(adapter->erp_dbf,1,"dev_oper"); 241 zfcp_erp_modify_adapter_status(adapter, 242 ZFCP_STATUS_COMMON_RUNNING, 243 ZFCP_SET); 244 zfcp_erp_adapter_reopen(adapter, 245 ZFCP_STATUS_COMMON_ERP_FAILED); 246 break; 247 } 248 zfcp_erp_wait(adapter); 249 up(&zfcp_data.config_sema); 250 return 1; 251} 252 253/** 254 * zfcp_ccw_register - ccw register function 255 * 256 * Registers the driver at the common i/o layer. This function will be called 257 * at module load time/system start. 258 */ 259int __init 260zfcp_ccw_register(void) 261{ 262 int retval; 263 264 retval = ccw_driver_register(&zfcp_ccw_driver); 265 if (retval) 266 goto out; 267 retval = zfcp_sysfs_driver_create_files(&zfcp_ccw_driver.driver); 268 if (retval) 269 ccw_driver_unregister(&zfcp_ccw_driver); 270 out: 271 return retval; 272} 273 274/** 275 * zfcp_ccw_shutdown - gets called on reboot/shutdown 276 * 277 * Makes sure that QDIO queues are down when the system gets stopped. 278 */ 279static void 280zfcp_ccw_shutdown(struct device *dev) 281{ 282 struct zfcp_adapter *adapter; 283 284 down(&zfcp_data.config_sema); 285 adapter = dev_get_drvdata(dev); 286 zfcp_erp_adapter_shutdown(adapter, 0); 287 zfcp_erp_wait(adapter); 288 up(&zfcp_data.config_sema); 289} 290 291#undef ZFCP_LOG_AREA 292