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