git.oblomov.eu Git - linux-2.6/blob - 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         goto out;
 120
 121  out_scsi_register:
 122         zfcp_erp_thread_kill(adapter);
 123  out:
 124         up(&zfcp_data.config_sema);
 125         return retval;
 126 }
 127
 128 /**
 129  * zfcp_ccw_set_offline - set_offline function of zfcp driver
 130  * @ccw_device: pointer to belonging ccw device
 131  *
 132  * This function gets called by the common i/o layer and sets an adapter
 133  * into state offline.
 134  */
 135 static int zfcp_ccw_set_offline(struct ccw_device *ccw_device)
 136 {
 137         struct zfcp_adapter *adapter;
 138
 139         down(&zfcp_data.config_sema);
 140         adapter = dev_get_drvdata(&ccw_device->dev);
 141         zfcp_erp_adapter_shutdown(adapter, 0, 86, NULL);
 142         zfcp_erp_wait(adapter);
 143         zfcp_erp_thread_kill(adapter);
 144         up(&zfcp_data.config_sema);
 145         return 0;
 146 }
 147
 148 /**
 149  * zfcp_ccw_notify - ccw notify function
 150  * @ccw_device: pointer to belonging ccw device
 151  * @event: indicates if adapter was detached or attached
 152  *
 153  * This function gets called by the common i/o layer if an adapter has gone
 154  * or reappeared.
 155  */
 156 static int zfcp_ccw_notify(struct ccw_device *ccw_device, int event)
 157 {
 158         struct zfcp_adapter *adapter = dev_get_drvdata(&ccw_device->dev);
 159
 160         switch (event) {
 161         case CIO_GONE:
 162                 dev_warn(&adapter->ccw_device->dev,
 163                          "The FCP device has been detached\n");
 164                 zfcp_erp_adapter_shutdown(adapter, 0, 87, NULL);
 165                 break;
 166         case CIO_NO_PATH:
 167                 dev_warn(&adapter->ccw_device->dev,
 168                          "The CHPID for the FCP device is offline\n");
 169                 zfcp_erp_adapter_shutdown(adapter, 0, 88, NULL);
 170                 break;
 171         case CIO_OPER:
 172                 dev_info(&adapter->ccw_device->dev,
 173                          "The FCP device is operational again\n");
 174                 zfcp_erp_modify_adapter_status(adapter, 11, NULL,
 175                                                ZFCP_STATUS_COMMON_RUNNING,
 176                                                ZFCP_SET);
 177                 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
 178                                         89, NULL);
 179                 break;
 180         }
 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 }
 229
 230 /**
 231  * zfcp_get_adapter_by_busid - find zfcp_adapter struct
 232  * @busid: bus id string of zfcp adapter to find
 233  */
 234 struct zfcp_adapter *zfcp_get_adapter_by_busid(char *busid)
 235 {
 236         struct ccw_device *ccw_device;
 237         struct zfcp_adapter *adapter = NULL;
 238
 239         ccw_device = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
 240         if (ccw_device) {
 241                 adapter = dev_get_drvdata(&ccw_device->dev);
 242                 put_device(&ccw_device->dev);
 243         }
 244         return adapter;
 245 }