drivers/s390/scsi/zfcp_ccw.c

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