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         .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