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   1 /*
   2  * zfcp device driver
   3  *
   4  * Registration and callback for the s390 common I/O layer.
   5  *
   6  * Copyright IBM Corporation 2002, 2008
   7  */
   8
   9 #include "zfcp_ext.h"
  10
  11 /**
  12  * zfcp_ccw_probe - probe function of zfcp driver
  13  * @ccw_device: pointer to belonging ccw device
  14  *
  15  * This function gets called by the common i/o layer and sets up the initial
  16  * data structures for each fcp adapter, which was detected by the system.
  17  * Also the sysfs files for this adapter will be created by this function.
  18  * In addition the nameserver port will be added to the ports of the adapter
  19  * and its sysfs representation will be created too.
  20  */
  21 static int zfcp_ccw_probe(struct ccw_device *ccw_device)
  22 {
  23         struct zfcp_adapter *adapter;
  24         int retval = 0;
  25
  26         down(&zfcp_data.config_sema);
  27         adapter = zfcp_adapter_enqueue(ccw_device);
  28         if (!adapter) {
  29                 dev_err(&ccw_device->dev,
  30                         "Setup of data structures failed.\n");
  31                 retval = -EINVAL;
  32         }
  33         up(&zfcp_data.config_sema);
  34         return retval;
  35 }
  36
  37 /**
  38  * zfcp_ccw_remove - remove function of zfcp driver
  39  * @ccw_device: pointer to belonging ccw device
  40  *
  41  * This function gets called by the common i/o layer and removes an adapter
  42  * from the system. Task of this function is to get rid of all units and
  43  * ports that belong to this adapter. And in addition all resources of this
  44  * adapter will be freed too.
  45  */
  46 static void zfcp_ccw_remove(struct ccw_device *ccw_device)
  47 {
  48         struct zfcp_adapter *adapter;
  49         struct zfcp_port *port, *p;
  50         struct zfcp_unit *unit, *u;
  51
  52         ccw_device_set_offline(ccw_device);
  53         down(&zfcp_data.config_sema);
  54         adapter = dev_get_drvdata(&ccw_device->dev);
  55
  56         write_lock_irq(&zfcp_data.config_lock);
  57         list_for_each_entry_safe(port, p, &adapter->port_list_head, list) {
  58                 list_for_each_entry_safe(unit, u, &port->unit_list_head, list) {
  59                         list_move(&unit->list, &port->unit_remove_lh);
  60                         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE,
  61                                         &unit->status);
  62                 }
  63                 list_move(&port->list, &adapter->port_remove_lh);
  64                 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
  65         }
  66         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
  67         write_unlock_irq(&zfcp_data.config_lock);
  68
  69         list_for_each_entry_safe(port, p, &adapter->port_remove_lh, list) {
  70                 list_for_each_entry_safe(unit, u, &port->unit_remove_lh, list) {
  71                         if (atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED,
  72                                 &unit->status))
  73                                 scsi_remove_device(unit->device);
  74                         zfcp_unit_dequeue(unit);
  75                 }
  76                 zfcp_port_dequeue(port);
  77         }
  78         zfcp_adapter_wait(adapter);
  79         zfcp_adapter_dequeue(adapter);
  80
  81         up(&zfcp_data.config_sema);
  82 }
  83
  84 /**
  85  * zfcp_ccw_set_online - set_online function of zfcp driver
  86  * @ccw_device: pointer to belonging ccw device
  87  *
  88  * This function gets called by the common i/o layer and sets an adapter
  89  * into state online. Setting an fcp device online means that it will be
  90  * registered with the SCSI stack, that the QDIO queues will be set up
  91  * and that the adapter will be opened (asynchronously).
  92  */
  93 static int zfcp_ccw_set_online(struct ccw_device *ccw_device)
  94 {
  95         struct zfcp_adapter *adapter;
  96         int retval;
  97
  98         down(&zfcp_data.config_sema);
  99         adapter = dev_get_drvdata(&ccw_device->dev);
 100
 101         retval = zfcp_erp_thread_setup(adapter);
 102         if (retval)
 103                 goto out;
 104
 105         retval = zfcp_adapter_scsi_register(adapter);
 106         if (retval)
 107                 goto out_scsi_register;
 108
 109         /* initialize request counter */
 110         BUG_ON(!zfcp_reqlist_isempty(adapter));
 111         adapter->req_no = 0;
 112
 113         zfcp_erp_modify_adapter_status(adapter, 10, NULL,
 114                                        ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
 115         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, 85,
 116                                 NULL);
 117         zfcp_erp_wait(adapter);
 118         goto out;
 119
 120  out_scsi_register:
 121         zfcp_erp_thread_kill(adapter);
 122  out:
 123         up(&zfcp_data.config_sema);
 124         return retval;
 125 }
 126
 127 /**
 128  * zfcp_ccw_set_offline - set_offline function of zfcp driver
 129  * @ccw_device: pointer to belonging ccw device
 130  *
 131  * This function gets called by the common i/o layer and sets an adapter
 132  * into state offline.
 133  */
 134 static int zfcp_ccw_set_offline(struct ccw_device *ccw_device)
 135 {
 136         struct zfcp_adapter *adapter;
 137
 138         down(&zfcp_data.config_sema);
 139         adapter = dev_get_drvdata(&ccw_device->dev);
 140         zfcp_erp_adapter_shutdown(adapter, 0, 86, NULL);
 141         zfcp_erp_wait(adapter);
 142         zfcp_erp_thread_kill(adapter);
 143         up(&zfcp_data.config_sema);
 144         return 0;
 145 }
 146
 147 /**
 148  * zfcp_ccw_notify - ccw notify function
 149  * @ccw_device: pointer to belonging ccw device
 150  * @event: indicates if adapter was detached or attached
 151  *
 152  * This function gets called by the common i/o layer if an adapter has gone
 153  * or reappeared.
 154  */
 155 static int zfcp_ccw_notify(struct ccw_device *ccw_device, int event)
 156 {
 157         struct zfcp_adapter *adapter;
 158
 159         down(&zfcp_data.config_sema);
 160         adapter = dev_get_drvdata(&ccw_device->dev);
 161         switch (event) {
 162         case CIO_GONE:
 163                 dev_warn(&adapter->ccw_device->dev, "device gone\n");
 164                 zfcp_erp_adapter_shutdown(adapter, 0, 87, NULL);
 165                 break;
 166         case CIO_NO_PATH:
 167                 dev_warn(&adapter->ccw_device->dev, "no path\n");
 168                 zfcp_erp_adapter_shutdown(adapter, 0, 88, NULL);
 169                 break;
 170         case CIO_OPER:
 171                 dev_info(&adapter->ccw_device->dev, "operational again\n");
 172                 zfcp_erp_modify_adapter_status(adapter, 11, NULL,
 173                                                ZFCP_STATUS_COMMON_RUNNING,
 174                                                ZFCP_SET);
 175                 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
 176                                         89, NULL);
 177                 break;
 178         }
 179         zfcp_erp_wait(adapter);
 180         up(&zfcp_data.config_sema);
 181         return 1;
 182 }
 183
 184 /**
 185  * zfcp_ccw_shutdown - handle shutdown from cio
 186  * @cdev: device for adapter to shutdown.
 187  */
 188 static void zfcp_ccw_shutdown(struct ccw_device *cdev)
 189 {
 190         struct zfcp_adapter *adapter;
 191
 192         down(&zfcp_data.config_sema);
 193         adapter = dev_get_drvdata(&cdev->dev);
 194         zfcp_erp_adapter_shutdown(adapter, 0, 90, NULL);
 195         zfcp_erp_wait(adapter);
 196         up(&zfcp_data.config_sema);
 197 }
 198
 199 static struct ccw_device_id zfcp_ccw_device_id[] = {
 200         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
 201         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x4) }, /* priv. */
 202         {},
 203 };
 204
 205 MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
 206
 207 static struct ccw_driver zfcp_ccw_driver = {
 208         .owner       = THIS_MODULE,
 209         .name        = "zfcp",
 210         .ids         = zfcp_ccw_device_id,
 211         .probe       = zfcp_ccw_probe,
 212         .remove      = zfcp_ccw_remove,
 213         .set_online  = zfcp_ccw_set_online,
 214         .set_offline = zfcp_ccw_set_offline,
 215         .notify      = zfcp_ccw_notify,
 216         .shutdown    = zfcp_ccw_shutdown,
 217 };
 218
 219 /**
 220  * zfcp_ccw_register - ccw register function
 221  *
 222  * Registers the driver at the common i/o layer. This function will be called
 223  * at module load time/system start.
 224  */
 225 int __init zfcp_ccw_register(void)
 226 {
 227         return ccw_driver_register(&zfcp_ccw_driver);
 228 }