SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/s390/scsi/zfcp_ccw.c

   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                         if (atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED,
 124                                 &unit->status))
 125                                 scsi_remove_device(unit->device);
 126                         zfcp_unit_dequeue(unit);
 127                 }
 128                 zfcp_port_dequeue(port);
 129         }
 130         zfcp_adapter_wait(adapter);
 131         zfcp_adapter_dequeue(adapter);
 132
 133         up(&zfcp_data.config_sema);
 134 }
 135
 136 /**
 137  * zfcp_ccw_set_online - set_online function of zfcp driver
 138  * @ccw_device: pointer to belonging ccw device
 139  *
 140  * This function gets called by the common i/o layer and sets an adapter
 141  * into state online. Setting an fcp device online means that it will be
 142  * registered with the SCSI stack, that the QDIO queues will be set up
 143  * and that the adapter will be opened (asynchronously).
 144  */
 145 static int
 146 zfcp_ccw_set_online(struct ccw_device *ccw_device)
 147 {
 148         struct zfcp_adapter *adapter;
 149         int retval;
 150
 151         down(&zfcp_data.config_sema);
 152         adapter = dev_get_drvdata(&ccw_device->dev);
 153
 154         retval = zfcp_erp_thread_setup(adapter);
 155         if (retval) {
 156                 ZFCP_LOG_INFO("error: start of error recovery thread for "
 157                               "adapter %s failed\n",
 158                               zfcp_get_busid_by_adapter(adapter));
 159                 goto out;
 160         }
 161
 162         retval = zfcp_adapter_scsi_register(adapter);
 163         if (retval)
 164                 goto out_scsi_register;
 165
 166         /* initialize request counter */
 167         BUG_ON(!zfcp_reqlist_isempty(adapter));
 168         adapter->req_no = 0;
 169
 170         zfcp_erp_modify_adapter_status(adapter, ZFCP_STATUS_COMMON_RUNNING,
 171                                        ZFCP_SET);
 172         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED);
 173         zfcp_erp_wait(adapter);
 174         goto out;
 175
 176  out_scsi_register:
 177         zfcp_erp_thread_kill(adapter);
 178  out:
 179         up(&zfcp_data.config_sema);
 180         return retval;
 181 }
 182
 183 /**
 184  * zfcp_ccw_set_offline - set_offline function of zfcp driver
 185  * @ccw_device: pointer to belonging ccw device
 186  *
 187  * This function gets called by the common i/o layer and sets an adapter
 188  * into state offline.
 189  */
 190 static int
 191 zfcp_ccw_set_offline(struct ccw_device *ccw_device)
 192 {
 193         struct zfcp_adapter *adapter;
 194
 195         down(&zfcp_data.config_sema);
 196         adapter = dev_get_drvdata(&ccw_device->dev);
 197         zfcp_erp_adapter_shutdown(adapter, 0);
 198         zfcp_erp_wait(adapter);
 199         zfcp_erp_thread_kill(adapter);
 200         up(&zfcp_data.config_sema);
 201         return 0;
 202 }
 203
 204 /**
 205  * zfcp_ccw_notify
 206  * @ccw_device: pointer to belonging ccw device
 207  * @event: indicates if adapter was detached or attached
 208  *
 209  * This function gets called by the common i/o layer if an adapter has gone
 210  * or reappeared.
 211  */
 212 static int
 213 zfcp_ccw_notify(struct ccw_device *ccw_device, int event)
 214 {
 215         struct zfcp_adapter *adapter;
 216
 217         down(&zfcp_data.config_sema);
 218         adapter = dev_get_drvdata(&ccw_device->dev);
 219         switch (event) {
 220         case CIO_GONE:
 221                 ZFCP_LOG_NORMAL("adapter %s: device gone\n",
 222                                 zfcp_get_busid_by_adapter(adapter));
 223                 debug_text_event(adapter->erp_dbf,1,"dev_gone");
 224                 zfcp_erp_adapter_shutdown(adapter, 0);
 225                 break;
 226         case CIO_NO_PATH:
 227                 ZFCP_LOG_NORMAL("adapter %s: no path\n",
 228                                 zfcp_get_busid_by_adapter(adapter));
 229                 debug_text_event(adapter->erp_dbf,1,"no_path");
 230                 zfcp_erp_adapter_shutdown(adapter, 0);
 231                 break;
 232         case CIO_OPER:
 233                 ZFCP_LOG_NORMAL("adapter %s: operational again\n",
 234                                 zfcp_get_busid_by_adapter(adapter));
 235                 debug_text_event(adapter->erp_dbf,1,"dev_oper");
 236                 zfcp_erp_modify_adapter_status(adapter,
 237                                                ZFCP_STATUS_COMMON_RUNNING,
 238                                                ZFCP_SET);
 239                 zfcp_erp_adapter_reopen(adapter,
 240                                         ZFCP_STATUS_COMMON_ERP_FAILED);
 241                 break;
 242         }
 243         zfcp_erp_wait(adapter);
 244         up(&zfcp_data.config_sema);
 245         return 1;
 246 }
 247
 248 /**
 249  * zfcp_ccw_register - ccw register function
 250  *
 251  * Registers the driver at the common i/o layer. This function will be called
 252  * at module load time/system start.
 253  */
 254 int __init
 255 zfcp_ccw_register(void)
 256 {
 257         int retval;
 258
 259         retval = ccw_driver_register(&zfcp_ccw_driver);
 260         if (retval)
 261                 goto out;
 262         retval = zfcp_sysfs_driver_create_files(&zfcp_ccw_driver.driver);
 263         if (retval)
 264                 ccw_driver_unregister(&zfcp_ccw_driver);
 265  out:
 266         return retval;
 267 }
 268
 269 /**
 270  * zfcp_ccw_shutdown - gets called on reboot/shutdown
 271  *
 272  * Makes sure that QDIO queues are down when the system gets stopped.
 273  */
 274 static void
 275 zfcp_ccw_shutdown(struct ccw_device *cdev)
 276 {
 277         struct zfcp_adapter *adapter;
 278
 279         down(&zfcp_data.config_sema);
 280         adapter = dev_get_drvdata(&cdev->dev);
 281         zfcp_erp_adapter_shutdown(adapter, 0);
 282         zfcp_erp_wait(adapter);
 283         up(&zfcp_data.config_sema);
 284 }
 285
 286 #undef ZFCP_LOG_AREA