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, 2010
   7  */
   8
   9 #define KMSG_COMPONENT "zfcp"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include "zfcp_ext.h"
  13 #include "zfcp_reqlist.h"
  14
  15 #define ZFCP_MODEL_PRIV 0x4
  16
  17 static DEFINE_SPINLOCK(zfcp_ccw_adapter_ref_lock);
  18
  19 struct zfcp_adapter *zfcp_ccw_adapter_by_cdev(struct ccw_device *cdev)
  20 {
  21         struct zfcp_adapter *adapter;
  22         unsigned long flags;
  23
  24         spin_lock_irqsave(&zfcp_ccw_adapter_ref_lock, flags);
  25         adapter = dev_get_drvdata(&cdev->dev);
  26         if (adapter)
  27                 kref_get(&adapter->ref);
  28         spin_unlock_irqrestore(&zfcp_ccw_adapter_ref_lock, flags);
  29         return adapter;
  30 }
  31
  32 void zfcp_ccw_adapter_put(struct zfcp_adapter *adapter)
  33 {
  34         unsigned long flags;
  35
  36         spin_lock_irqsave(&zfcp_ccw_adapter_ref_lock, flags);
  37         kref_put(&adapter->ref, zfcp_adapter_release);
  38         spin_unlock_irqrestore(&zfcp_ccw_adapter_ref_lock, flags);
  39 }
  40
  41 static int zfcp_ccw_activate(struct ccw_device *cdev)
  42
  43 {
  44         struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
  45
  46         if (!adapter)
  47                 return 0;
  48
  49         zfcp_erp_set_adapter_status(adapter, ZFCP_STATUS_COMMON_RUNNING);
  50         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
  51                                 "ccresu2");
  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->dev, &zfcp_sysfs_unit_attrs);
 126
 127         list_for_each_entry_safe(port, p, &port_remove_lh, list)
 128                 zfcp_device_unregister(&port->dev, &zfcp_sysfs_port_attrs);
 129
 130         zfcp_adapter_unregister(adapter);
 131 }
 132
 133 /**
 134  * zfcp_ccw_set_online - set_online function of zfcp driver
 135  * @cdev: pointer to belonging ccw device
 136  *
 137  * This function gets called by the common i/o layer and sets an
 138  * adapter into state online.  The first call will allocate all
 139  * adapter resources that will be retained until the device is removed
 140  * via zfcp_ccw_remove.
 141  *
 142  * Setting an fcp device online means that it will be registered with
 143  * the SCSI stack, that the QDIO queues will be set up and that the
 144  * adapter will be opened.
 145  */
 146 static int zfcp_ccw_set_online(struct ccw_device *cdev)
 147 {
 148         struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
 149
 150         if (!adapter) {
 151                 adapter = zfcp_adapter_enqueue(cdev);
 152
 153                 if (IS_ERR(adapter)) {
 154                         dev_err(&cdev->dev,
 155                                 "Setting up data structures for the "
 156                                 "FCP adapter failed\n");
 157                         return PTR_ERR(adapter);
 158                 }
 159                 kref_get(&adapter->ref);
 160         }
 161
 162         /* initialize request counter */
 163         BUG_ON(!zfcp_reqlist_isempty(adapter->req_list));
 164         adapter->req_no = 0;
 165
 166         zfcp_ccw_activate(cdev);
 167         zfcp_ccw_adapter_put(adapter);
 168         return 0;
 169 }
 170
 171 /**
 172  * zfcp_ccw_set_offline - set_offline function of zfcp driver
 173  * @cdev: pointer to belonging ccw device
 174  *
 175  * This function gets called by the common i/o layer and sets an adapter
 176  * into state offline.
 177  */
 178 static int zfcp_ccw_set_offline(struct ccw_device *cdev)
 179 {
 180         struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
 181
 182         if (!adapter)
 183                 return 0;
 184
 185         zfcp_erp_adapter_shutdown(adapter, 0, "ccsoff1");
 186         zfcp_erp_wait(adapter);
 187
 188         zfcp_ccw_adapter_put(adapter);
 189         return 0;
 190 }
 191
 192 /**
 193  * zfcp_ccw_notify - ccw notify function
 194  * @cdev: pointer to belonging ccw device
 195  * @event: indicates if adapter was detached or attached
 196  *
 197  * This function gets called by the common i/o layer if an adapter has gone
 198  * or reappeared.
 199  */
 200 static int zfcp_ccw_notify(struct ccw_device *cdev, int event)
 201 {
 202         struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
 203
 204         if (!adapter)
 205                 return 1;
 206
 207         switch (event) {
 208         case CIO_GONE:
 209                 dev_warn(&cdev->dev, "The FCP device has been detached\n");
 210                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti1");
 211                 break;
 212         case CIO_NO_PATH:
 213                 dev_warn(&cdev->dev,
 214                          "The CHPID for the FCP device is offline\n");
 215                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti2");
 216                 break;
 217         case CIO_OPER:
 218                 dev_info(&cdev->dev, "The FCP device is operational again\n");
 219                 zfcp_erp_set_adapter_status(adapter,
 220                                             ZFCP_STATUS_COMMON_RUNNING);
 221                 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
 222                                         "ccnoti4");
 223                 break;
 224         case CIO_BOXED:
 225                 dev_warn(&cdev->dev, "The FCP device did not respond within "
 226                                      "the specified time\n");
 227                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5");
 228                 break;
 229         }
 230
 231         zfcp_ccw_adapter_put(adapter);
 232         return 1;
 233 }
 234
 235 /**
 236  * zfcp_ccw_shutdown - handle shutdown from cio
 237  * @cdev: device for adapter to shutdown.
 238  */
 239 static void zfcp_ccw_shutdown(struct ccw_device *cdev)
 240 {
 241         struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev);
 242
 243         if (!adapter)
 244                 return;
 245
 246         zfcp_erp_adapter_shutdown(adapter, 0, "ccshut1");
 247         zfcp_erp_wait(adapter);
 248         zfcp_erp_thread_kill(adapter);
 249
 250         zfcp_ccw_adapter_put(adapter);
 251 }
 252
 253 struct ccw_driver zfcp_ccw_driver = {
 254         .owner       = THIS_MODULE,
 255         .name        = "zfcp",
 256         .ids         = zfcp_ccw_device_id,
 257         .probe       = zfcp_ccw_probe,
 258         .remove      = zfcp_ccw_remove,
 259         .set_online  = zfcp_ccw_set_online,
 260         .set_offline = zfcp_ccw_set_offline,
 261         .notify      = zfcp_ccw_notify,
 262         .shutdown    = zfcp_ccw_shutdown,
 263         .freeze      = zfcp_ccw_set_offline,
 264         .thaw        = zfcp_ccw_activate,
 265         .restore     = zfcp_ccw_activate,
 266 };