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         retval = zfcp_adapter_scsi_register(adapter);
 110         if (retval)
 111                 goto out_scsi_register;
 112
 113         /* initialize request counter */
 114         BUG_ON(!zfcp_reqlist_isempty(adapter));
 115         adapter->req_no = 0;
 116
 117         zfcp_erp_modify_adapter_status(adapter, 10, NULL,
 118                                        ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
 119         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, 85,
 120                                 NULL);
 121         zfcp_erp_wait(adapter);
 122         up(&zfcp_data.config_sema);
 123         flush_work(&adapter->scan_work);
 124         return 0;
 125
 126  out_scsi_register:
 127         zfcp_erp_thread_kill(adapter);
 128  out:
 129         up(&zfcp_data.config_sema);
 130         return retval;
 131 }
 132
 133 /**
 134  * zfcp_ccw_set_offline - set_offline function of zfcp driver
 135  * @ccw_device: pointer to belonging ccw device
 136  *
 137  * This function gets called by the common i/o layer and sets an adapter
 138  * into state offline.
 139  */
 140 static int zfcp_ccw_set_offline(struct ccw_device *ccw_device)
 141 {
 142         struct zfcp_adapter *adapter;
 143
 144         down(&zfcp_data.config_sema);
 145         adapter = dev_get_drvdata(&ccw_device->dev);
 146         zfcp_erp_adapter_shutdown(adapter, 0, 86, NULL);
 147         zfcp_erp_wait(adapter);
 148         zfcp_erp_thread_kill(adapter);
 149         up(&zfcp_data.config_sema);
 150         return 0;
 151 }
 152
 153 /**
 154  * zfcp_ccw_notify - ccw notify function
 155  * @ccw_device: pointer to belonging ccw device
 156  * @event: indicates if adapter was detached or attached
 157  *
 158  * This function gets called by the common i/o layer if an adapter has gone
 159  * or reappeared.
 160  */
 161 static int zfcp_ccw_notify(struct ccw_device *ccw_device, int event)
 162 {
 163         struct zfcp_adapter *adapter = dev_get_drvdata(&ccw_device->dev);
 164
 165         switch (event) {
 166         case CIO_GONE:
 167                 dev_warn(&adapter->ccw_device->dev,
 168                          "The FCP device has been detached\n");
 169                 zfcp_erp_adapter_shutdown(adapter, 0, 87, NULL);
 170                 break;
 171         case CIO_NO_PATH:
 172                 dev_warn(&adapter->ccw_device->dev,
 173                          "The CHPID for the FCP device is offline\n");
 174                 zfcp_erp_adapter_shutdown(adapter, 0, 88, NULL);
 175                 break;
 176         case CIO_OPER:
 177                 dev_info(&adapter->ccw_device->dev,
 178                          "The FCP device is operational again\n");
 179                 zfcp_erp_modify_adapter_status(adapter, 11, NULL,
 180                                                ZFCP_STATUS_COMMON_RUNNING,
 181                                                ZFCP_SET);
 182                 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
 183                                         89, NULL);
 184                 break;
 185         }
 186         return 1;
 187 }
 188
 189 /**
 190  * zfcp_ccw_shutdown - handle shutdown from cio
 191  * @cdev: device for adapter to shutdown.
 192  */
 193 static void zfcp_ccw_shutdown(struct ccw_device *cdev)
 194 {
 195         struct zfcp_adapter *adapter;
 196
 197         down(&zfcp_data.config_sema);
 198         adapter = dev_get_drvdata(&cdev->dev);
 199         zfcp_erp_adapter_shutdown(adapter, 0, 90, NULL);
 200         zfcp_erp_wait(adapter);
 201         up(&zfcp_data.config_sema);
 202 }
 203
 204 static struct ccw_device_id zfcp_ccw_device_id[] = {
 205         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
 206         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x4) }, /* priv. */
 207         {},
 208 };
 209
 210 MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
 211
 212 static struct ccw_driver zfcp_ccw_driver = {
 213         .owner       = THIS_MODULE,
 214         .name        = "zfcp",
 215         .ids         = zfcp_ccw_device_id,
 216         .probe       = zfcp_ccw_probe,
 217         .remove      = zfcp_ccw_remove,
 218         .set_online  = zfcp_ccw_set_online,
 219         .set_offline = zfcp_ccw_set_offline,
 220         .notify      = zfcp_ccw_notify,
 221         .shutdown    = zfcp_ccw_shutdown,
 222 };
 223
 224 /**
 225  * zfcp_ccw_register - ccw register function
 226  *
 227  * Registers the driver at the common i/o layer. This function will be called
 228  * at module load time/system start.
 229  */
 230 int __init zfcp_ccw_register(void)
 231 {
 232         return ccw_driver_register(&zfcp_ccw_driver);
 233 }
 234
 235 /**
 236  * zfcp_get_adapter_by_busid - find zfcp_adapter struct
 237  * @busid: bus id string of zfcp adapter to find
 238  */
 239 struct zfcp_adapter *zfcp_get_adapter_by_busid(char *busid)
 240 {
 241         struct ccw_device *ccw_device;
 242         struct zfcp_adapter *adapter = NULL;
 243
 244         ccw_device = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
 245         if (ccw_device) {
 246                 adapter = dev_get_drvdata(&ccw_device->dev);
 247                 put_device(&ccw_device->dev);
 248         }
 249         return adapter;
 250 }