drivers/s390/scsi/zfcp_ccw.c

   1 /*
   2  * linux/drivers/s390/scsi/zfcp_ccw.c
   3  *
   4  * FCP adapter driver for IBM eServer zSeries
   5  *
   6  * CCW driver related routines
   7  *
   8  * (C) Copyright IBM Corp. 2003, 2004
   9  *
  10  * Authors:
  11  *      Martin Peschke <mpeschke@de.ibm.com>
  12  *      Heiko Carstens <heiko.carstens@de.ibm.com>
  13  *      Andreas Herrmann <aherrman@de.ibm.com>
  14  *
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2, or (at your option)
  18  * any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  28  */
  29
  30 #include "zfcp_ext.h"
  31
  32 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG
  33
  34 static int zfcp_ccw_probe(struct ccw_device *);
  35 static void zfcp_ccw_remove(struct ccw_device *);
  36 static int zfcp_ccw_set_online(struct ccw_device *);
  37 static int zfcp_ccw_set_offline(struct ccw_device *);
  38 static int zfcp_ccw_notify(struct ccw_device *, int);
  39 static void zfcp_ccw_shutdown(struct device *);
  40
  41 static struct ccw_device_id zfcp_ccw_device_id[] = {
  42         {CCW_DEVICE_DEVTYPE(ZFCP_CONTROL_UNIT_TYPE,
  43                             ZFCP_CONTROL_UNIT_MODEL,
  44                             ZFCP_DEVICE_TYPE,
  45                             ZFCP_DEVICE_MODEL)},
  46         {CCW_DEVICE_DEVTYPE(ZFCP_CONTROL_UNIT_TYPE,
  47                             ZFCP_CONTROL_UNIT_MODEL,
  48                             ZFCP_DEVICE_TYPE,
  49                             ZFCP_DEVICE_MODEL_PRIV)},
  50         {},
  51 };
  52
  53 static struct ccw_driver zfcp_ccw_driver = {
  54         .owner       = THIS_MODULE,
  55         .name        = ZFCP_NAME,
  56         .ids         = zfcp_ccw_device_id,
  57         .probe       = zfcp_ccw_probe,
  58         .remove      = zfcp_ccw_remove,
  59         .set_online  = zfcp_ccw_set_online,
  60         .set_offline = zfcp_ccw_set_offline,
  61         .notify      = zfcp_ccw_notify,
  62         .driver      = {
  63                 .shutdown = zfcp_ccw_shutdown,
  64         },
  65 };
  66
  67 MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
  68
  69 /**
  70  * zfcp_ccw_probe - probe function of zfcp driver
  71  * @ccw_device: pointer to belonging ccw device
  72  *
  73  * This function gets called by the common i/o layer and sets up the initial
  74  * data structures for each fcp adapter, which was detected by the system.
  75  * Also the sysfs files for this adapter will be created by this function.
  76  * In addition the nameserver port will be added to the ports of the adapter
  77  * and its sysfs representation will be created too.
  78  */
  79 static int
  80 zfcp_ccw_probe(struct ccw_device *ccw_device)
  81 {
  82         struct zfcp_adapter *adapter;
  83         int retval = 0;
  84
  85         down(&zfcp_data.config_sema);
  86         adapter = zfcp_adapter_enqueue(ccw_device);
  87         if (!adapter)
  88                 retval = -EINVAL;
  89         else
  90                 ZFCP_LOG_DEBUG("Probed adapter %s\n",
  91                                zfcp_get_busid_by_adapter(adapter));
  92         up(&zfcp_data.config_sema);
  93         return retval;
  94 }
  95
  96 /**
  97  * zfcp_ccw_remove - remove function of zfcp driver
  98  * @ccw_device: pointer to belonging ccw device
  99  *
 100  * This function gets called by the common i/o layer and removes an adapter
 101  * from the system. Task of this function is to get rid of all units and
 102  * ports that belong to this adapter. And in addition all resources of this
 103  * adapter will be freed too.
 104  */
 105 static void
 106 zfcp_ccw_remove(struct ccw_device *ccw_device)
 107 {
 108         struct zfcp_adapter *adapter;
 109         struct zfcp_port *port, *p;
 110         struct zfcp_unit *unit, *u;
 111
 112         ccw_device_set_offline(ccw_device);
 113         down(&zfcp_data.config_sema);
 114         adapter = dev_get_drvdata(&ccw_device->dev);
 115
 116         ZFCP_LOG_DEBUG("Removing adapter %s\n",
 117                        zfcp_get_busid_by_adapter(adapter));
 118         write_lock_irq(&zfcp_data.config_lock);
 119         list_for_each_entry_safe(port, p, &adapter->port_list_head, list) {
 120                 list_for_each_entry_safe(unit, u, &port->unit_list_head, list) {
 121                         list_move(&unit->list, &port->unit_remove_lh);
 122                         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE,
 123                                         &unit->status);
 124                 }
 125                 list_move(&port->list, &adapter->port_remove_lh);
 126                 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
 127         }
 128         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
 129         write_unlock_irq(&zfcp_data.config_lock);
 130
 131         list_for_each_entry_safe(port, p, &adapter->port_remove_lh, list) {
 132                 list_for_each_entry_safe(unit, u, &port->unit_remove_lh, list) {
 133                         zfcp_unit_dequeue(unit);
 134                 }
 135                 zfcp_port_dequeue(port);
 136         }
 137         zfcp_adapter_wait(adapter);
 138         zfcp_adapter_dequeue(adapter);
 139
 140         up(&zfcp_data.config_sema);
 141 }
 142
 143 /**
 144  * zfcp_ccw_set_online - set_online function of zfcp driver
 145  * @ccw_device: pointer to belonging ccw device
 146  *
 147  * This function gets called by the common i/o layer and sets an adapter
 148  * into state online. Setting an fcp device online means that it will be
 149  * registered with the SCSI stack, that the QDIO queues will be set up
 150  * and that the adapter will be opened (asynchronously).
 151  */
 152 static int
 153 zfcp_ccw_set_online(struct ccw_device *ccw_device)
 154 {
 155         struct zfcp_adapter *adapter;
 156         int retval;
 157
 158         down(&zfcp_data.config_sema);
 159         adapter = dev_get_drvdata(&ccw_device->dev);
 160
 161         retval = zfcp_adapter_debug_register(adapter);
 162         if (retval)
 163                 goto out;
 164         retval = zfcp_erp_thread_setup(adapter);
 165         if (retval) {
 166                 ZFCP_LOG_INFO("error: start of error recovery thread for "
 167                               "adapter %s failed\n",
 168                               zfcp_get_busid_by_adapter(adapter));
 169                 goto out_erp_thread;
 170         }
 171
 172         retval = zfcp_adapter_scsi_register(adapter);
 173         if (retval)
 174                 goto out_scsi_register;
 175         zfcp_erp_modify_adapter_status(adapter, ZFCP_STATUS_COMMON_RUNNING,
 176                                        ZFCP_SET);
 177         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED);
 178         zfcp_erp_wait(adapter);
 179         goto out;
 180
 181  out_scsi_register:
 182         zfcp_erp_thread_kill(adapter);
 183  out_erp_thread:
 184         zfcp_adapter_debug_unregister(adapter);
 185  out:
 186         up(&zfcp_data.config_sema);
 187         return retval;
 188 }
 189
 190 /**
 191  * zfcp_ccw_set_offline - set_offline function of zfcp driver
 192  * @ccw_device: pointer to belonging ccw device
 193  *
 194  * This function gets called by the common i/o layer and sets an adapter
 195  * into state offline. Setting an fcp device offline means that it will be
 196  * unregistered from the SCSI stack and that the adapter will be shut down
 197  * asynchronously.
 198  */
 199 static int
 200 zfcp_ccw_set_offline(struct ccw_device *ccw_device)
 201 {
 202         struct zfcp_adapter *adapter;
 203
 204         down(&zfcp_data.config_sema);
 205         adapter = dev_get_drvdata(&ccw_device->dev);
 206         zfcp_erp_adapter_shutdown(adapter, 0);
 207         zfcp_erp_wait(adapter);
 208         zfcp_adapter_scsi_unregister(adapter);
 209         zfcp_erp_thread_kill(adapter);
 210         zfcp_adapter_debug_unregister(adapter);
 211         up(&zfcp_data.config_sema);
 212         return 0;
 213 }
 214
 215 /**
 216  * zfcp_ccw_notify
 217  * @ccw_device: pointer to belonging ccw device
 218  * @event: indicates if adapter was detached or attached
 219  *
 220  * This function gets called by the common i/o layer if an adapter has gone
 221  * or reappeared.
 222  */
 223 static int
 224 zfcp_ccw_notify(struct ccw_device *ccw_device, int event)
 225 {
 226         struct zfcp_adapter *adapter;
 227
 228         down(&zfcp_data.config_sema);
 229         adapter = dev_get_drvdata(&ccw_device->dev);
 230         switch (event) {
 231         case CIO_GONE:
 232                 ZFCP_LOG_NORMAL("adapter %s: device gone\n",
 233                                 zfcp_get_busid_by_adapter(adapter));
 234                 debug_text_event(adapter->erp_dbf,1,"dev_gone");
 235                 zfcp_erp_adapter_shutdown(adapter, 0);
 236                 break;
 237         case CIO_NO_PATH:
 238                 ZFCP_LOG_NORMAL("adapter %s: no path\n",
 239                                 zfcp_get_busid_by_adapter(adapter));
 240                 debug_text_event(adapter->erp_dbf,1,"no_path");
 241                 zfcp_erp_adapter_shutdown(adapter, 0);
 242                 break;
 243         case CIO_OPER:
 244                 ZFCP_LOG_NORMAL("adapter %s: operational again\n",
 245                                 zfcp_get_busid_by_adapter(adapter));
 246                 debug_text_event(adapter->erp_dbf,1,"dev_oper");
 247                 zfcp_erp_modify_adapter_status(adapter,
 248                                                ZFCP_STATUS_COMMON_RUNNING,
 249                                                ZFCP_SET);
 250                 zfcp_erp_adapter_reopen(adapter,
 251                                         ZFCP_STATUS_COMMON_ERP_FAILED);
 252                 break;
 253         }
 254         zfcp_erp_wait(adapter);
 255         up(&zfcp_data.config_sema);
 256         return 1;
 257 }
 258
 259 /**
 260  * zfcp_ccw_register - ccw register function
 261  *
 262  * Registers the driver at the common i/o layer. This function will be called
 263  * at module load time/system start.
 264  */
 265 int __init
 266 zfcp_ccw_register(void)
 267 {
 268         int retval;
 269
 270         retval = ccw_driver_register(&zfcp_ccw_driver);
 271         if (retval)
 272                 goto out;
 273         retval = zfcp_sysfs_driver_create_files(&zfcp_ccw_driver.driver);
 274         if (retval)
 275                 ccw_driver_unregister(&zfcp_ccw_driver);
 276  out:
 277         return retval;
 278 }
 279
 280 /**
 281  * zfcp_ccw_unregister - ccw unregister function
 282  *
 283  * Unregisters the driver from common i/o layer. Function will be called at
 284  * module unload/system shutdown.
 285  */
 286 void __exit
 287 zfcp_ccw_unregister(void)
 288 {
 289         zfcp_sysfs_driver_remove_files(&zfcp_ccw_driver.driver);
 290         ccw_driver_unregister(&zfcp_ccw_driver);
 291 }
 292
 293 /**
 294  * zfcp_ccw_shutdown - gets called on reboot/shutdown
 295  *
 296  * Makes sure that QDIO queues are down when the system gets stopped.
 297  */
 298 static void
 299 zfcp_ccw_shutdown(struct device *dev)
 300 {
 301         struct zfcp_adapter *adapter;
 302
 303         down(&zfcp_data.config_sema);
 304         adapter = dev_get_drvdata(dev);
 305         zfcp_erp_adapter_shutdown(adapter, 0);
 306         zfcp_erp_wait(adapter);
 307         up(&zfcp_data.config_sema);
 308 }
 309
 310 #undef ZFCP_LOG_AREA