kernel/2.6.29.6-aldebaran-rt/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 #define KMSG_COMPONENT "zfcp"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include "zfcp_ext.h"
  13
  14 /**
  15  * zfcp_ccw_probe - probe function of zfcp driver
  16  * @ccw_device: pointer to belonging ccw device
  17  *
  18  * This function gets called by the common i/o layer and sets up the initial
  19  * data structures for each fcp adapter, which was detected by the system.
  20  * Also the sysfs files for this adapter will be created by this function.
  21  * In addition the nameserver port will be added to the ports of the adapter
  22  * and its sysfs representation will be created too.
  23  */
  24 static int zfcp_ccw_probe(struct ccw_device *ccw_device)
  25 {
  26         int retval = 0;
  27
  28         down(&zfcp_data.config_sema);
  29         if (zfcp_adapter_enqueue(ccw_device)) {
  30                 dev_err(&ccw_device->dev,
  31                         "Setting up data structures for the "
  32                         "FCP adapter failed\n");
  33                 retval = -EINVAL;
  34         }
  35         up(&zfcp_data.config_sema);
  36         return retval;
  37 }
  38
  39 /**
  40  * zfcp_ccw_remove - remove function of zfcp driver
  41  * @ccw_device: pointer to belonging ccw device
  42  *
  43  * This function gets called by the common i/o layer and removes an adapter
  44  * from the system. Task of this function is to get rid of all units and
  45  * ports that belong to this adapter. And in addition all resources of this
  46  * adapter will be freed too.
  47  */
  48 static void zfcp_ccw_remove(struct ccw_device *ccw_device)
  49 {
  50         struct zfcp_adapter *adapter;
  51         struct zfcp_port *port, *p;
  52         struct zfcp_unit *unit, *u;
  53         LIST_HEAD(unit_remove_lh);
  54         LIST_HEAD(port_remove_lh);
  55
  56         ccw_device_set_offline(ccw_device);
  57         down(&zfcp_data.config_sema);
  58         adapter = dev_get_drvdata(&ccw_device->dev);
  59
  60         write_lock_irq(&zfcp_data.config_lock);
  61         list_for_each_entry_safe(port, p, &adapter->port_list_head, list) {
  62                 list_for_each_entry_safe(unit, u, &port->unit_list_head, list) {
  63                         list_move(&unit->list, &unit_remove_lh);
  64                         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE,
  65                                         &unit->status);
  66                 }
  67                 list_move(&port->list, &port_remove_lh);
  68                 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
  69         }
  70         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
  71         write_unlock_irq(&zfcp_data.config_lock);
  72
  73         list_for_each_entry_safe(port, p, &port_remove_lh, list) {
  74                 list_for_each_entry_safe(unit, u, &unit_remove_lh, list) {
  75                         if (atomic_read(&unit->status) &
  76                             ZFCP_STATUS_UNIT_REGISTERED)
  77                                 scsi_remove_device(unit->device);
  78                         zfcp_unit_dequeue(unit);
  79                 }
  80                 zfcp_port_dequeue(port);
  81         }
  82         wait_event(adapter->remove_wq, atomic_read(&adapter->refcount) == 0);
  83         zfcp_adapter_dequeue(adapter);
  84
  85         up(&zfcp_data.config_sema);
  86 }
  87
  88 /**
  89  * zfcp_ccw_set_online - set_online function of zfcp driver
  90  * @ccw_device: pointer to belonging ccw device
  91  *
  92  * This function gets called by the common i/o layer and sets an adapter
  93  * into state online. Setting an fcp device online means that it will be
  94  * registered with the SCSI stack, that the QDIO queues will be set up
  95  * and that the adapter will be opened (asynchronously).
  96  */
  97 static int zfcp_ccw_set_online(struct ccw_device *ccw_device)
  98 {
  99         struct zfcp_adapter *adapter;
 100         int retval;
 101
 102         down(&zfcp_data.config_sema);
 103         adapter = dev_get_drvdata(&ccw_device->dev);
 104
 105         retval = zfcp_erp_thread_setup(adapter);
 106         if (retval)
 107                 goto out;
 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         up(&zfcp_data.config_sema);
 119         flush_work(&adapter->scan_work);
 120         return 0;
 121
 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 = dev_get_drvdata(&ccw_device->dev);
 158
 159         switch (event) {
 160         case CIO_GONE:
 161                 dev_warn(&adapter->ccw_device->dev,
 162                          "The FCP device has been detached\n");
 163                 zfcp_erp_adapter_shutdown(adapter, 0, 87, NULL);
 164                 break;
 165         case CIO_NO_PATH:
 166                 dev_warn(&adapter->ccw_device->dev,
 167                          "The CHPID for the FCP device is offline\n");
 168                 zfcp_erp_adapter_shutdown(adapter, 0, 88, NULL);
 169                 break;
 170         case CIO_OPER:
 171                 dev_info(&adapter->ccw_device->dev,
 172                          "The FCP device is operational again\n");
 173                 zfcp_erp_modify_adapter_status(adapter, 11, NULL,
 174                                                ZFCP_STATUS_COMMON_RUNNING,
 175                                                ZFCP_SET);
 176                 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
 177                                         89, NULL);
 178                 break;
 179         }
 180         return 1;
 181 }
 182
 183 /**
 184  * zfcp_ccw_shutdown - handle shutdown from cio
 185  * @cdev: device for adapter to shutdown.
 186  */
 187 static void zfcp_ccw_shutdown(struct ccw_device *cdev)
 188 {
 189         struct zfcp_adapter *adapter;
 190
 191         down(&zfcp_data.config_sema);
 192         adapter = dev_get_drvdata(&cdev->dev);
 193         zfcp_erp_adapter_shutdown(adapter, 0, 90, NULL);
 194         zfcp_erp_wait(adapter);
 195         up(&zfcp_data.config_sema);
 196 }
 197
 198 static struct ccw_device_id zfcp_ccw_device_id[] = {
 199         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
 200         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x4) }, /* priv. */
 201         {},
 202 };
 203
 204 MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
 205
 206 static struct ccw_driver zfcp_ccw_driver = {
 207         .owner       = THIS_MODULE,
 208         .name        = "zfcp",
 209         .ids         = zfcp_ccw_device_id,
 210         .probe       = zfcp_ccw_probe,
 211         .remove      = zfcp_ccw_remove,
 212         .set_online  = zfcp_ccw_set_online,
 213         .set_offline = zfcp_ccw_set_offline,
 214         .notify      = zfcp_ccw_notify,
 215         .shutdown    = zfcp_ccw_shutdown,
 216 };
 217
 218 /**
 219  * zfcp_ccw_register - ccw register function
 220  *
 221  * Registers the driver at the common i/o layer. This function will be called
 222  * at module load time/system start.
 223  */
 224 int __init zfcp_ccw_register(void)
 225 {
 226         return ccw_driver_register(&zfcp_ccw_driver);
 227 }
 228
 229 /**
 230  * zfcp_get_adapter_by_busid - find zfcp_adapter struct
 231  * @busid: bus id string of zfcp adapter to find
 232  */
 233 struct zfcp_adapter *zfcp_get_adapter_by_busid(char *busid)
 234 {
 235         struct ccw_device *ccw_device;
 236         struct zfcp_adapter *adapter = NULL;
 237
 238         ccw_device = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
 239         if (ccw_device) {
 240                 adapter = dev_get_drvdata(&ccw_device->dev);
 241                 put_device(&ccw_device->dev);
 242         }
 243         return adapter;
 244 }