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