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                         "Setting up data structures for the "
  29                         "FCP adapter failed\n");
  30                 retval = -EINVAL;
  31         }
  32         up(&zfcp_data.config_sema);
  33         return retval;
  34 }
  35
  36 /**
  37  * zfcp_ccw_remove - remove function of zfcp driver
  38  * @ccw_device: pointer to belonging ccw device
  39  *
  40  * This function gets called by the common i/o layer and removes an adapter
  41  * from the system. Task of this function is to get rid of all units and
  42  * ports that belong to this adapter. And in addition all resources of this
  43  * adapter will be freed too.
  44  */
  45 static void zfcp_ccw_remove(struct ccw_device *ccw_device)
  46 {
  47         struct zfcp_adapter *adapter;
  48         struct zfcp_port *port, *p;
  49         struct zfcp_unit *unit, *u;
  50         LIST_HEAD(unit_remove_lh);
  51         LIST_HEAD(port_remove_lh);
  52
  53         ccw_device_set_offline(ccw_device);
  54         down(&zfcp_data.config_sema);
  55         adapter = dev_get_drvdata(&ccw_device->dev);
  56
  57         write_lock_irq(&zfcp_data.config_lock);
  58         list_for_each_entry_safe(port, p, &adapter->port_list_head, list) {
  59                 list_for_each_entry_safe(unit, u, &port->unit_list_head, list) {
  60                         list_move(&unit->list, &unit_remove_lh);
  61                         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE,
  62                                         &unit->status);
  63                 }
  64                 list_move(&port->list, &port_remove_lh);
  65                 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
  66         }
  67         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
  68         write_unlock_irq(&zfcp_data.config_lock);
  69
  70         list_for_each_entry_safe(port, p, &port_remove_lh, list) {
  71                 list_for_each_entry_safe(unit, u, &unit_remove_lh, list) {
  72                         if (atomic_read(&unit->status) &
  73                             ZFCP_STATUS_UNIT_REGISTERED)
  74                                 scsi_remove_device(unit->device);
  75                         zfcp_unit_dequeue(unit);
  76                 }
  77                 zfcp_port_dequeue(port);
  78         }
  79         wait_event(adapter->remove_wq, atomic_read(&adapter->refcount) == 0);
  80         zfcp_adapter_dequeue(adapter);
  81
  82         up(&zfcp_data.config_sema);
  83 }
  84
  85 /**
  86  * zfcp_ccw_set_online - set_online function of zfcp driver
  87  * @ccw_device: pointer to belonging ccw device
  88  *
  89  * This function gets called by the common i/o layer and sets an adapter
  90  * into state online. Setting an fcp device online means that it will be
  91  * registered with the SCSI stack, that the QDIO queues will be set up
  92  * and that the adapter will be opened (asynchronously).
  93  */
  94 static int zfcp_ccw_set_online(struct ccw_device *ccw_device)
  95 {
  96         struct zfcp_adapter *adapter;
  97         int retval;
  98
  99         down(&zfcp_data.config_sema);
 100         adapter = dev_get_drvdata(&ccw_device->dev);
 101
 102         retval = zfcp_erp_thread_setup(adapter);
 103         if (retval)
 104                 goto out;
 105
 106         retval = zfcp_adapter_scsi_register(adapter);
 107         if (retval)
 108                 goto out_scsi_register;
 109
 110         /* initialize request counter */
 111         BUG_ON(!zfcp_reqlist_isempty(adapter));
 112         adapter->req_no = 0;
 113
 114         zfcp_erp_modify_adapter_status(adapter, 10, NULL,
 115                                        ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
 116         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, 85,
 117                                 NULL);
 118         zfcp_erp_wait(adapter);
 119         up(&zfcp_data.config_sema);
 120         flush_work(&adapter->scan_work);
 121         return 0;
 122
 123  out_scsi_register:
 124         zfcp_erp_thread_kill(adapter);
 125  out:
 126         up(&zfcp_data.config_sema);
 127         return retval;
 128 }
 129
 130 /**
 131  * zfcp_ccw_set_offline - set_offline function of zfcp driver
 132  * @ccw_device: pointer to belonging ccw device
 133  *
 134  * This function gets called by the common i/o layer and sets an adapter
 135  * into state offline.
 136  */
 137 static int zfcp_ccw_set_offline(struct ccw_device *ccw_device)
 138 {
 139         struct zfcp_adapter *adapter;
 140
 141         down(&zfcp_data.config_sema);
 142         adapter = dev_get_drvdata(&ccw_device->dev);
 143         zfcp_erp_adapter_shutdown(adapter, 0, 86, NULL);
 144         zfcp_erp_wait(adapter);
 145         zfcp_erp_thread_kill(adapter);
 146         up(&zfcp_data.config_sema);
 147         return 0;
 148 }
 149
 150 /**
 151  * zfcp_ccw_notify - ccw notify function
 152  * @ccw_device: pointer to belonging ccw device
 153  * @event: indicates if adapter was detached or attached
 154  *
 155  * This function gets called by the common i/o layer if an adapter has gone
 156  * or reappeared.
 157  */
 158 static int zfcp_ccw_notify(struct ccw_device *ccw_device, int event)
 159 {
 160         struct zfcp_adapter *adapter = dev_get_drvdata(&ccw_device->dev);
 161
 162         switch (event) {
 163         case CIO_GONE:
 164                 dev_warn(&adapter->ccw_device->dev,
 165                          "The FCP device has been detached\n");
 166                 zfcp_erp_adapter_shutdown(adapter, 0, 87, NULL);
 167                 break;
 168         case CIO_NO_PATH:
 169                 dev_warn(&adapter->ccw_device->dev,
 170                          "The CHPID for the FCP device is offline\n");
 171                 zfcp_erp_adapter_shutdown(adapter, 0, 88, NULL);
 172                 break;
 173         case CIO_OPER:
 174                 dev_info(&adapter->ccw_device->dev,
 175                          "The FCP device is operational again\n");
 176                 zfcp_erp_modify_adapter_status(adapter, 11, NULL,
 177                                                ZFCP_STATUS_COMMON_RUNNING,
 178                                                ZFCP_SET);
 179                 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
 180                                         89, NULL);
 181                 break;
 182         }
 183         return 1;
 184 }
 185
 186 /**
 187  * zfcp_ccw_shutdown - handle shutdown from cio
 188  * @cdev: device for adapter to shutdown.
 189  */
 190 static void zfcp_ccw_shutdown(struct ccw_device *cdev)
 191 {
 192         struct zfcp_adapter *adapter;
 193
 194         down(&zfcp_data.config_sema);
 195         adapter = dev_get_drvdata(&cdev->dev);
 196         zfcp_erp_adapter_shutdown(adapter, 0, 90, NULL);
 197         zfcp_erp_wait(adapter);
 198         up(&zfcp_data.config_sema);
 199 }
 200
 201 static struct ccw_device_id zfcp_ccw_device_id[] = {
 202         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
 203         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x4) }, /* priv. */
 204         {},
 205 };
 206
 207 MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
 208
 209 static struct ccw_driver zfcp_ccw_driver = {
 210         .owner       = THIS_MODULE,
 211         .name        = "zfcp",
 212         .ids         = zfcp_ccw_device_id,
 213         .probe       = zfcp_ccw_probe,
 214         .remove      = zfcp_ccw_remove,
 215         .set_online  = zfcp_ccw_set_online,
 216         .set_offline = zfcp_ccw_set_offline,
 217         .notify      = zfcp_ccw_notify,
 218         .shutdown    = zfcp_ccw_shutdown,
 219 };
 220
 221 /**
 222  * zfcp_ccw_register - ccw register function
 223  *
 224  * Registers the driver at the common i/o layer. This function will be called
 225  * at module load time/system start.
 226  */
 227 int __init zfcp_ccw_register(void)
 228 {
 229         return ccw_driver_register(&zfcp_ccw_driver);
 230 }
 231
 232 /**
 233  * zfcp_get_adapter_by_busid - find zfcp_adapter struct
 234  * @busid: bus id string of zfcp adapter to find
 235  */
 236 struct zfcp_adapter *zfcp_get_adapter_by_busid(char *busid)
 237 {
 238         struct ccw_device *ccw_device;
 239         struct zfcp_adapter *adapter = NULL;
 240
 241         ccw_device = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
 242         if (ccw_device) {
 243                 adapter = dev_get_drvdata(&ccw_device->dev);
 244                 put_device(&ccw_device->dev);
 245         }
 246         return adapter;
 247 }