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 int zfcp_ccw_suspend(struct ccw_device *cdev)
  17
  18 {
  19         struct zfcp_adapter *adapter = dev_get_drvdata(&cdev->dev);
  20
  21         if (!adapter)
  22                 return 0;
  23
  24         mutex_lock(&zfcp_data.config_mutex);
  25
  26         zfcp_erp_adapter_shutdown(adapter, 0, "ccsusp1", NULL);
  27         zfcp_erp_wait(adapter);
  28
  29         mutex_unlock(&zfcp_data.config_mutex);
  30
  31         return 0;
  32 }
  33
  34 static int zfcp_ccw_activate(struct ccw_device *cdev)
  35
  36 {
  37         struct zfcp_adapter *adapter = dev_get_drvdata(&cdev->dev);
  38
  39         if (!adapter)
  40                 return 0;
  41
  42         zfcp_erp_modify_adapter_status(adapter, "ccresu1", NULL,
  43                                        ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
  44         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
  45                                 "ccresu2", NULL);
  46         zfcp_erp_wait(adapter);
  47         flush_work(&adapter->scan_work);
  48
  49         return 0;
  50 }
  51
  52 static struct ccw_device_id zfcp_ccw_device_id[] = {
  53         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
  54         { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, ZFCP_MODEL_PRIV) },
  55         {},
  56 };
  57 MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
  58
  59 /**
  60  * zfcp_ccw_priv_sch - check if subchannel is privileged
  61  * @adapter: Adapter/Subchannel to check
  62  */
  63 int zfcp_ccw_priv_sch(struct zfcp_adapter *adapter)
  64 {
  65         return adapter->ccw_device->id.dev_model == ZFCP_MODEL_PRIV;
  66 }
  67
  68 /**
  69  * zfcp_ccw_probe - probe function of zfcp driver
  70  * @ccw_device: pointer to belonging ccw device
  71  *
  72  * This function gets called by the common i/o layer for each FCP
  73  * device found on the current system. This is only a stub to make cio
  74  * work: To only allocate adapter resources for devices actually used,
  75  * the allocation is deferred to the first call to ccw_set_online.
  76  */
  77 static int zfcp_ccw_probe(struct ccw_device *ccw_device)
  78 {
  79         return 0;
  80 }
  81
  82 /**
  83  * zfcp_ccw_remove - remove function of zfcp driver
  84  * @ccw_device: pointer to belonging ccw device
  85  *
  86  * This function gets called by the common i/o layer and removes an adapter
  87  * from the system. Task of this function is to get rid of all units and
  88  * ports that belong to this adapter. And in addition all resources of this
  89  * adapter will be freed too.
  90  */
  91 static void zfcp_ccw_remove(struct ccw_device *ccw_device)
  92 {
  93         struct zfcp_adapter *adapter;
  94         struct zfcp_port *port, *p;
  95         struct zfcp_unit *unit, *u;
  96         LIST_HEAD(unit_remove_lh);
  97         LIST_HEAD(port_remove_lh);
  98
  99         ccw_device_set_offline(ccw_device);
 100
 101         mutex_lock(&zfcp_data.config_mutex);
 102         adapter = dev_get_drvdata(&ccw_device->dev);
 103         if (!adapter)
 104                 goto out;
 105         mutex_unlock(&zfcp_data.config_mutex);
 106
 107         cancel_work_sync(&adapter->scan_work);
 108
 109         mutex_lock(&zfcp_data.config_mutex);
 110
 111         /* this also removes the scsi devices, so call it first */
 112         zfcp_adapter_scsi_unregister(adapter);
 113
 114         write_lock_irq(&zfcp_data.config_lock);
 115         list_for_each_entry_safe(port, p, &adapter->port_list_head, list) {
 116                 list_for_each_entry_safe(unit, u, &port->unit_list_head, list) {
 117                         list_move(&unit->list, &unit_remove_lh);
 118                         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE,
 119                                         &unit->status);
 120                 }
 121                 list_move(&port->list, &port_remove_lh);
 122                 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
 123         }
 124         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
 125         write_unlock_irq(&zfcp_data.config_lock);
 126
 127         list_for_each_entry_safe(port, p, &port_remove_lh, list) {
 128                 list_for_each_entry_safe(unit, u, &unit_remove_lh, list)
 129                         zfcp_unit_dequeue(unit);
 130                 zfcp_port_dequeue(port);
 131         }
 132         wait_event(adapter->remove_wq, atomic_read(&adapter->refcount) == 0);
 133         zfcp_adapter_dequeue(adapter);
 134
 135 out:
 136         mutex_unlock(&zfcp_data.config_mutex);
 137 }
 138
 139 /**
 140  * zfcp_ccw_set_online - set_online function of zfcp driver
 141  * @ccw_device: pointer to belonging ccw device
 142  *
 143  * This function gets called by the common i/o layer and sets an
 144  * adapter into state online.  The first call will allocate all
 145  * adapter resources that will be retained until the device is removed
 146  * via zfcp_ccw_remove.
 147  *
 148  * Setting an fcp device online means that it will be registered with
 149  * the SCSI stack, that the QDIO queues will be set up and that the
 150  * adapter will be opened.
 151  */
 152 static int zfcp_ccw_set_online(struct ccw_device *ccw_device)
 153 {
 154         struct zfcp_adapter *adapter;
 155         int ret = 0;
 156
 157         mutex_lock(&zfcp_data.config_mutex);
 158         adapter = dev_get_drvdata(&ccw_device->dev);
 159
 160         if (!adapter) {
 161                 ret = zfcp_adapter_enqueue(ccw_device);
 162                 if (ret) {
 163                         dev_err(&ccw_device->dev,
 164                                 "Setting up data structures for the "
 165                                 "FCP adapter failed\n");
 166                         goto out;
 167                 }
 168                 adapter = dev_get_drvdata(&ccw_device->dev);
 169         }
 170
 171         /* initialize request counter */
 172         BUG_ON(!zfcp_reqlist_isempty(adapter));
 173         adapter->req_no = 0;
 174
 175         zfcp_erp_modify_adapter_status(adapter, "ccsonl1", NULL,
 176                                        ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
 177         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
 178                                 "ccsonl2", NULL);
 179         zfcp_erp_wait(adapter);
 180 out:
 181         mutex_unlock(&zfcp_data.config_mutex);
 182         if (!ret)
 183                 flush_work(&adapter->scan_work);
 184         return ret;
 185 }
 186
 187 /**
 188  * zfcp_ccw_set_offline - set_offline function of zfcp driver
 189  * @ccw_device: pointer to belonging ccw device
 190  *
 191  * This function gets called by the common i/o layer and sets an adapter
 192  * into state offline.
 193  */
 194 static int zfcp_ccw_set_offline(struct ccw_device *ccw_device)
 195 {
 196         struct zfcp_adapter *adapter;
 197
 198         mutex_lock(&zfcp_data.config_mutex);
 199         adapter = dev_get_drvdata(&ccw_device->dev);
 200         zfcp_erp_adapter_shutdown(adapter, 0, "ccsoff1", NULL);
 201         zfcp_erp_wait(adapter);
 202         mutex_unlock(&zfcp_data.config_mutex);
 203         return 0;
 204 }
 205
 206 /**
 207  * zfcp_ccw_notify - ccw notify function
 208  * @ccw_device: pointer to belonging ccw device
 209  * @event: indicates if adapter was detached or attached
 210  *
 211  * This function gets called by the common i/o layer if an adapter has gone
 212  * or reappeared.
 213  */
 214 static int zfcp_ccw_notify(struct ccw_device *ccw_device, int event)
 215 {
 216         struct zfcp_adapter *adapter = dev_get_drvdata(&ccw_device->dev);
 217
 218         switch (event) {
 219         case CIO_GONE:
 220                 dev_warn(&adapter->ccw_device->dev,
 221                          "The FCP device has been detached\n");
 222                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti1", NULL);
 223                 break;
 224         case CIO_NO_PATH:
 225                 dev_warn(&adapter->ccw_device->dev,
 226                          "The CHPID for the FCP device is offline\n");
 227                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti2", NULL);
 228                 break;
 229         case CIO_OPER:
 230                 dev_info(&adapter->ccw_device->dev,
 231                          "The FCP device is operational again\n");
 232                 zfcp_erp_modify_adapter_status(adapter, "ccnoti3", NULL,
 233                                                ZFCP_STATUS_COMMON_RUNNING,
 234                                                ZFCP_SET);
 235                 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
 236                                         "ccnoti4", NULL);
 237                 break;
 238         case CIO_BOXED:
 239                 dev_warn(&adapter->ccw_device->dev, "The FCP device "
 240                          "did not respond within the specified time\n");
 241                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5", NULL);
 242                 break;
 243         }
 244         return 1;
 245 }
 246
 247 /**
 248  * zfcp_ccw_shutdown - handle shutdown from cio
 249  * @cdev: device for adapter to shutdown.
 250  */
 251 static void zfcp_ccw_shutdown(struct ccw_device *cdev)
 252 {
 253         struct zfcp_adapter *adapter;
 254
 255         mutex_lock(&zfcp_data.config_mutex);
 256         adapter = dev_get_drvdata(&cdev->dev);
 257         if (!adapter)
 258                 goto out;
 259
 260         zfcp_erp_adapter_shutdown(adapter, 0, "ccshut1", NULL);
 261         zfcp_erp_wait(adapter);
 262         zfcp_erp_thread_kill(adapter);
 263 out:
 264         mutex_unlock(&zfcp_data.config_mutex);
 265 }
 266
 267 struct ccw_driver zfcp_ccw_driver = {
 268         .owner       = THIS_MODULE,
 269         .name        = "zfcp",
 270         .ids         = zfcp_ccw_device_id,
 271         .probe       = zfcp_ccw_probe,
 272         .remove      = zfcp_ccw_remove,
 273         .set_online  = zfcp_ccw_set_online,
 274         .set_offline = zfcp_ccw_set_offline,
 275         .notify      = zfcp_ccw_notify,
 276         .shutdown    = zfcp_ccw_shutdown,
 277         .freeze      = zfcp_ccw_suspend,
 278         .thaw        = zfcp_ccw_activate,
 279         .restore     = zfcp_ccw_activate,
 280 };
 281
 282 /**
 283  * zfcp_ccw_register - ccw register function
 284  *
 285  * Registers the driver at the common i/o layer. This function will be called
 286  * at module load time/system start.
 287  */
 288 int __init zfcp_ccw_register(void)
 289 {
 290         return ccw_driver_register(&zfcp_ccw_driver);
 291 }