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, 2009
   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 (unit->device)
  76                                 scsi_remove_device(unit->device);
  77                         zfcp_unit_dequeue(unit);
  78                 }
  79                 zfcp_port_dequeue(port);
  80         }
  81         wait_event(adapter->remove_wq, atomic_read(&adapter->refcount) == 0);
  82         zfcp_adapter_dequeue(adapter);
  83
  84         up(&zfcp_data.config_sema);
  85 }
  86
  87 /**
  88  * zfcp_ccw_set_online - set_online function of zfcp driver
  89  * @ccw_device: pointer to belonging ccw device
  90  *
  91  * This function gets called by the common i/o layer and sets an adapter
  92  * into state online. Setting an fcp device online means that it will be
  93  * registered with the SCSI stack, that the QDIO queues will be set up
  94  * and that the adapter will be opened (asynchronously).
  95  */
  96 static int zfcp_ccw_set_online(struct ccw_device *ccw_device)
  97 {
  98         struct zfcp_adapter *adapter;
  99         int retval;
 100
 101         down(&zfcp_data.config_sema);
 102         adapter = dev_get_drvdata(&ccw_device->dev);
 103
 104         retval = zfcp_erp_thread_setup(adapter);
 105         if (retval)
 106                 goto out;
 107
 108         /* initialize request counter */
 109         BUG_ON(!zfcp_reqlist_isempty(adapter));
 110         adapter->req_no = 0;
 111
 112         zfcp_erp_modify_adapter_status(adapter, "ccsonl1", NULL,
 113                                        ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
 114         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
 115                                 "ccsonl2", NULL);
 116         zfcp_erp_wait(adapter);
 117         up(&zfcp_data.config_sema);
 118         flush_work(&adapter->scan_work);
 119         return 0;
 120
 121  out:
 122         up(&zfcp_data.config_sema);
 123         return retval;
 124 }
 125
 126 /**
 127  * zfcp_ccw_set_offline - set_offline function of zfcp driver
 128  * @ccw_device: pointer to belonging ccw device
 129  *
 130  * This function gets called by the common i/o layer and sets an adapter
 131  * into state offline.
 132  */
 133 static int zfcp_ccw_set_offline(struct ccw_device *ccw_device)
 134 {
 135         struct zfcp_adapter *adapter;
 136
 137         down(&zfcp_data.config_sema);
 138         adapter = dev_get_drvdata(&ccw_device->dev);
 139         zfcp_erp_adapter_shutdown(adapter, 0, "ccsoff1", NULL);
 140         zfcp_erp_wait(adapter);
 141         zfcp_erp_thread_kill(adapter);
 142         up(&zfcp_data.config_sema);
 143         return 0;
 144 }
 145
 146 /**
 147  * zfcp_ccw_notify - ccw notify function
 148  * @ccw_device: pointer to belonging ccw device
 149  * @event: indicates if adapter was detached or attached
 150  *
 151  * This function gets called by the common i/o layer if an adapter has gone
 152  * or reappeared.
 153  */
 154 static int zfcp_ccw_notify(struct ccw_device *ccw_device, int event)
 155 {
 156         struct zfcp_adapter *adapter = dev_get_drvdata(&ccw_device->dev);
 157
 158         switch (event) {
 159         case CIO_GONE:
 160                 dev_warn(&adapter->ccw_device->dev,
 161                          "The FCP device has been detached\n");
 162                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti1", NULL);
 163                 break;
 164         case CIO_NO_PATH:
 165                 dev_warn(&adapter->ccw_device->dev,
 166                          "The CHPID for the FCP device is offline\n");
 167                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti2", NULL);
 168                 break;
 169         case CIO_OPER:
 170                 dev_info(&adapter->ccw_device->dev,
 171                          "The FCP device is operational again\n");
 172                 zfcp_erp_modify_adapter_status(adapter, "ccnoti3", NULL,
 173                                                ZFCP_STATUS_COMMON_RUNNING,
 174                                                ZFCP_SET);
 175                 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
 176                                         "ccnoti4", NULL);
 177                 break;
 178         case CIO_BOXED:
 179                 dev_warn(&adapter->ccw_device->dev,
 180                          "The ccw device did not respond in time.\n");
 181                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5", NULL);
 182                 break;
 183         }
 184         return 1;
 185 }
 186
 187 /**
 188  * zfcp_ccw_shutdown - handle shutdown from cio
 189  * @cdev: device for adapter to shutdown.
 190  */
 191 static void zfcp_ccw_shutdown(struct ccw_device *cdev)
 192 {
 193         struct zfcp_adapter *adapter;
 194
 195         down(&zfcp_data.config_sema);
 196         adapter = dev_get_drvdata(&cdev->dev);
 197         zfcp_erp_adapter_shutdown(adapter, 0, "ccshut1", NULL);
 198         zfcp_erp_wait(adapter);
 199         up(&zfcp_data.config_sema);
 200 }
 201
 202 static struct ccw_device_id zfcp_ccw_device_id[] = {
 203         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
 204         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x4) }, /* priv. */
 205         {},
 206 };
 207
 208 MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
 209
 210 static struct ccw_driver zfcp_ccw_driver = {
 211         .owner       = THIS_MODULE,
 212         .name        = "zfcp",
 213         .ids         = zfcp_ccw_device_id,
 214         .probe       = zfcp_ccw_probe,
 215         .remove      = zfcp_ccw_remove,
 216         .set_online  = zfcp_ccw_set_online,
 217         .set_offline = zfcp_ccw_set_offline,
 218         .notify      = zfcp_ccw_notify,
 219         .shutdown    = zfcp_ccw_shutdown,
 220 };
 221
 222 /**
 223  * zfcp_ccw_register - ccw register function
 224  *
 225  * Registers the driver at the common i/o layer. This function will be called
 226  * at module load time/system start.
 227  */
 228 int __init zfcp_ccw_register(void)
 229 {
 230         return ccw_driver_register(&zfcp_ccw_driver);
 231 }
 232
 233 /**
 234  * zfcp_get_adapter_by_busid - find zfcp_adapter struct
 235  * @busid: bus id string of zfcp adapter to find
 236  */
 237 struct zfcp_adapter *zfcp_get_adapter_by_busid(char *busid)
 238 {
 239         struct ccw_device *ccw_device;
 240         struct zfcp_adapter *adapter = NULL;
 241
 242         ccw_device = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
 243         if (ccw_device) {
 244                 adapter = dev_get_drvdata(&ccw_device->dev);
 245                 put_device(&ccw_device->dev);
 246         }
 247         return adapter;
 248 }