SAFE public projects git trees. - safe/jmp/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 #define ZFCP_MODEL_PRIV 0x4
  15
  16 static DEFINE_SPINLOCK(zfcp_ccw_adapter_ref_lock);
  17
  18 struct zfcp_adapter *zfcp_ccw_adapter_by_cdev(struct ccw_device *cdev)
  19 {
  20         struct zfcp_adapter *adapter;
  21         unsigned long flags;
  22
  23         spin_lock_irqsave(&zfcp_ccw_adapter_ref_lock, flags);
  24         adapter = dev_get_drvdata(&cdev->dev);
  25         if (adapter)
  26                 kref_get(&adapter->ref);
  27         spin_unlock_irqrestore(&zfcp_ccw_adapter_ref_lock, flags);
  28         return adapter;
  29 }
  30
  31 void zfcp_ccw_adapter_put(struct zfcp_adapter *adapter)
  32 {
  33         unsigned long flags;
  34
  35         spin_lock_irqsave(&zfcp_ccw_adapter_ref_lock, flags);
  36         kref_put(&adapter->ref, zfcp_adapter_release);
  37         spin_unlock_irqrestore(&zfcp_ccw_adapter_ref_lock, flags);
  38 }
  39
  40 static int zfcp_ccw_activate(struct ccw_device *cdev)
  41
  42 {
  43         struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
  44
  45         if (!adapter)
  46                 return 0;
  47
  48         zfcp_erp_modify_adapter_status(adapter, "ccresu1", NULL,
  49                                        ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
  50         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
  51                                 "ccresu2", NULL);
  52         zfcp_erp_wait(adapter);
  53         flush_work(&adapter->scan_work);
  54
  55         zfcp_ccw_adapter_put(adapter);
  56
  57         return 0;
  58 }
  59
  60 static struct ccw_device_id zfcp_ccw_device_id[] = {
  61         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
  62         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, ZFCP_MODEL_PRIV) },
  63         {},
  64 };
  65 MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
  66
  67 /**
  68  * zfcp_ccw_priv_sch - check if subchannel is privileged
  69  * @adapter: Adapter/Subchannel to check
  70  */
  71 int zfcp_ccw_priv_sch(struct zfcp_adapter *adapter)
  72 {
  73         return adapter->ccw_device->id.dev_model == ZFCP_MODEL_PRIV;
  74 }
  75
  76 /**
  77  * zfcp_ccw_probe - probe function of zfcp driver
  78  * @cdev: pointer to belonging ccw device
  79  *
  80  * This function gets called by the common i/o layer for each FCP
  81  * device found on the current system. This is only a stub to make cio
  82  * work: To only allocate adapter resources for devices actually used,
  83  * the allocation is deferred to the first call to ccw_set_online.
  84  */
  85 static int zfcp_ccw_probe(struct ccw_device *cdev)
  86 {
  87         return 0;
  88 }
  89
  90 /**
  91  * zfcp_ccw_remove - remove function of zfcp driver
  92  * @cdev: pointer to belonging ccw device
  93  *
  94  * This function gets called by the common i/o layer and removes an adapter
  95  * from the system. Task of this function is to get rid of all units and
  96  * ports that belong to this adapter. And in addition all resources of this
  97  * adapter will be freed too.
  98  */
  99 static void zfcp_ccw_remove(struct ccw_device *cdev)
 100 {
 101         struct zfcp_adapter *adapter;
 102         struct zfcp_port *port, *p;
 103         struct zfcp_unit *unit, *u;
 104         LIST_HEAD(unit_remove_lh);
 105         LIST_HEAD(port_remove_lh);
 106
 107         ccw_device_set_offline(cdev);
 108
 109         adapter = zfcp_ccw_adapter_by_cdev(cdev);
 110         if (!adapter)
 111                 return;
 112
 113         write_lock_irq(&adapter->port_list_lock);
 114         list_for_each_entry_safe(port, p, &adapter->port_list, list) {
 115                 write_lock(&port->unit_list_lock);
 116                 list_for_each_entry_safe(unit, u, &port->unit_list, list)
 117                         list_move(&unit->list, &unit_remove_lh);
 118                 write_unlock(&port->unit_list_lock);
 119                 list_move(&port->list, &port_remove_lh);
 120         }
 121         write_unlock_irq(&adapter->port_list_lock);
 122         zfcp_ccw_adapter_put(adapter); /* put from zfcp_ccw_adapter_by_cdev */
 123
 124         list_for_each_entry_safe(unit, u, &unit_remove_lh, list)
 125                 zfcp_device_unregister(&unit->sysfs_device,
 126                                        &zfcp_sysfs_unit_attrs);
 127
 128         list_for_each_entry_safe(port, p, &port_remove_lh, list)
 129                 zfcp_device_unregister(&port->sysfs_device,
 130                                        &zfcp_sysfs_port_attrs);
 131
 132         zfcp_adapter_unregister(adapter);
 133 }
 134
 135 /**
 136  * zfcp_ccw_set_online - set_online function of zfcp driver
 137  * @cdev: pointer to belonging ccw device
 138  *
 139  * This function gets called by the common i/o layer and sets an
 140  * adapter into state online.  The first call will allocate all
 141  * adapter resources that will be retained until the device is removed
 142  * via zfcp_ccw_remove.
 143  *
 144  * Setting an fcp device online means that it will be registered with
 145  * the SCSI stack, that the QDIO queues will be set up and that the
 146  * adapter will be opened.
 147  */
 148 static int zfcp_ccw_set_online(struct ccw_device *cdev)
 149 {
 150         struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
 151
 152         if (!adapter) {
 153                 adapter = zfcp_adapter_enqueue(cdev);
 154
 155                 if (IS_ERR(adapter)) {
 156                         dev_err(&cdev->dev,
 157                                 "Setting up data structures for the "
 158                                 "FCP adapter failed\n");
 159                         return PTR_ERR(adapter);
 160                 }
 161                 kref_get(&adapter->ref);
 162         }
 163
 164         /* initialize request counter */
 165         BUG_ON(!zfcp_reqlist_isempty(adapter));
 166         adapter->req_no = 0;
 167
 168         zfcp_erp_modify_adapter_status(adapter, "ccsonl1", NULL,
 169                                        ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
 170         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
 171                                 "ccsonl2", NULL);
 172         zfcp_erp_wait(adapter);
 173
 174         flush_work(&adapter->scan_work);
 175
 176         zfcp_ccw_adapter_put(adapter);
 177         return 0;
 178 }
 179
 180 /**
 181  * zfcp_ccw_set_offline - set_offline function of zfcp driver
 182  * @cdev: pointer to belonging ccw device
 183  *
 184  * This function gets called by the common i/o layer and sets an adapter
 185  * into state offline.
 186  */
 187 static int zfcp_ccw_set_offline(struct ccw_device *cdev)
 188 {
 189         struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
 190
 191         if (!adapter)
 192                 return 0;
 193
 194         zfcp_erp_adapter_shutdown(adapter, 0, "ccsoff1", NULL);
 195         zfcp_erp_wait(adapter);
 196
 197         zfcp_ccw_adapter_put(adapter);
 198         return 0;
 199 }
 200
 201 /**
 202  * zfcp_ccw_notify - ccw notify function
 203  * @cdev: pointer to belonging ccw device
 204  * @event: indicates if adapter was detached or attached
 205  *
 206  * This function gets called by the common i/o layer if an adapter has gone
 207  * or reappeared.
 208  */
 209 static int zfcp_ccw_notify(struct ccw_device *cdev, int event)
 210 {
 211         struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
 212
 213         if (!adapter)
 214                 return 1;
 215
 216         switch (event) {
 217         case CIO_GONE:
 218                 dev_warn(&cdev->dev, "The FCP device has been detached\n");
 219                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti1", NULL);
 220                 break;
 221         case CIO_NO_PATH:
 222                 dev_warn(&cdev->dev,
 223                          "The CHPID for the FCP device is offline\n");
 224                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti2", NULL);
 225                 break;
 226         case CIO_OPER:
 227                 dev_info(&cdev->dev, "The FCP device is operational again\n");
 228                 zfcp_erp_modify_adapter_status(adapter, "ccnoti3", NULL,
 229                                                ZFCP_STATUS_COMMON_RUNNING,
 230                                                ZFCP_SET);
 231                 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
 232                                         "ccnoti4", NULL);
 233                 break;
 234         case CIO_BOXED:
 235                 dev_warn(&cdev->dev, "The FCP device did not respond within "
 236                                      "the specified time\n");
 237                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5", NULL);
 238                 break;
 239         }
 240
 241         zfcp_ccw_adapter_put(adapter);
 242         return 1;
 243 }
 244
 245 /**
 246  * zfcp_ccw_shutdown - handle shutdown from cio
 247  * @cdev: device for adapter to shutdown.
 248  */
 249 static void zfcp_ccw_shutdown(struct ccw_device *cdev)
 250 {
 251         struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
 252
 253         if (!adapter)
 254                 return;
 255
 256         zfcp_erp_adapter_shutdown(adapter, 0, "ccshut1", NULL);
 257         zfcp_erp_wait(adapter);
 258         zfcp_erp_thread_kill(adapter);
 259
 260         zfcp_ccw_adapter_put(adapter);
 261 }
 262
 263 struct ccw_driver zfcp_ccw_driver = {
 264         .owner       = THIS_MODULE,
 265         .name        = "zfcp",
 266         .ids         = zfcp_ccw_device_id,
 267         .probe       = zfcp_ccw_probe,
 268         .remove      = zfcp_ccw_remove,
 269         .set_online  = zfcp_ccw_set_online,
 270         .set_offline = zfcp_ccw_set_offline,
 271         .notify      = zfcp_ccw_notify,
 272         .shutdown    = zfcp_ccw_shutdown,
 273         .freeze      = zfcp_ccw_set_offline,
 274         .thaw        = zfcp_ccw_activate,
 275         .restore     = zfcp_ccw_activate,
 276 };