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 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
 106         write_lock_irq(&zfcp_data.config_lock);
 107         list_for_each_entry_safe(port, p, &adapter->port_list_head, list) {
 108                 list_for_each_entry_safe(unit, u, &port->unit_list_head, list) {
 109                         list_move(&unit->list, &unit_remove_lh);
 110                         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE,
 111                                         &unit->status);
 112                 }
 113                 list_move(&port->list, &port_remove_lh);
 114                 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
 115         }
 116         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
 117         write_unlock_irq(&zfcp_data.config_lock);
 118
 119         list_for_each_entry_safe(port, p, &port_remove_lh, list) {
 120                 list_for_each_entry_safe(unit, u, &unit_remove_lh, list) {
 121                         if (unit->device)
 122                                 scsi_remove_device(unit->device);
 123                         zfcp_unit_dequeue(unit);
 124                 }
 125                 zfcp_port_dequeue(port);
 126         }
 127         wait_event(adapter->remove_wq, atomic_read(&adapter->refcount) == 0);
 128         zfcp_adapter_dequeue(adapter);
 129
 130 out:
 131         mutex_unlock(&zfcp_data.config_mutex);
 132 }
 133
 134 /**
 135  * zfcp_ccw_set_online - set_online function of zfcp driver
 136  * @ccw_device: 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 *ccw_device)
 148 {
 149         struct zfcp_adapter *adapter;
 150         int ret = 0;
 151
 152         mutex_lock(&zfcp_data.config_mutex);
 153         adapter = dev_get_drvdata(&ccw_device->dev);
 154
 155         if (!adapter) {
 156                 ret = zfcp_adapter_enqueue(ccw_device);
 157                 if (ret) {
 158                         dev_err(&ccw_device->dev,
 159                                 "Setting up data structures for the "
 160                                 "FCP adapter failed\n");
 161                         goto out;
 162                 }
 163                 adapter = dev_get_drvdata(&ccw_device->dev);
 164         }
 165
 166         /* initialize request counter */
 167         BUG_ON(!zfcp_reqlist_isempty(adapter));
 168         adapter->req_no = 0;
 169
 170         zfcp_erp_modify_adapter_status(adapter, "ccsonl1", NULL,
 171                                        ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
 172         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
 173                                 "ccsonl2", NULL);
 174         zfcp_erp_wait(adapter);
 175 out:
 176         mutex_unlock(&zfcp_data.config_mutex);
 177         if (!ret)
 178                 flush_work(&adapter->scan_work);
 179         return ret;
 180 }
 181
 182 /**
 183  * zfcp_ccw_set_offline - set_offline function of zfcp driver
 184  * @ccw_device: pointer to belonging ccw device
 185  *
 186  * This function gets called by the common i/o layer and sets an adapter
 187  * into state offline.
 188  */
 189 static int zfcp_ccw_set_offline(struct ccw_device *ccw_device)
 190 {
 191         struct zfcp_adapter *adapter;
 192
 193         mutex_lock(&zfcp_data.config_mutex);
 194         adapter = dev_get_drvdata(&ccw_device->dev);
 195         zfcp_erp_adapter_shutdown(adapter, 0, "ccsoff1", NULL);
 196         zfcp_erp_wait(adapter);
 197         mutex_unlock(&zfcp_data.config_mutex);
 198         return 0;
 199 }
 200
 201 /**
 202  * zfcp_ccw_notify - ccw notify function
 203  * @ccw_device: 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 *ccw_device, int event)
 210 {
 211         struct zfcp_adapter *adapter = dev_get_drvdata(&ccw_device->dev);
 212
 213         switch (event) {
 214         case CIO_GONE:
 215                 dev_warn(&adapter->ccw_device->dev,
 216                          "The FCP device has been detached\n");
 217                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti1", NULL);
 218                 break;
 219         case CIO_NO_PATH:
 220                 dev_warn(&adapter->ccw_device->dev,
 221                          "The CHPID for the FCP device is offline\n");
 222                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti2", NULL);
 223                 break;
 224         case CIO_OPER:
 225                 dev_info(&adapter->ccw_device->dev,
 226                          "The FCP device is operational again\n");
 227                 zfcp_erp_modify_adapter_status(adapter, "ccnoti3", NULL,
 228                                                ZFCP_STATUS_COMMON_RUNNING,
 229                                                ZFCP_SET);
 230                 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
 231                                         "ccnoti4", NULL);
 232                 break;
 233         case CIO_BOXED:
 234                 dev_warn(&adapter->ccw_device->dev, "The FCP device "
 235                          "did not respond within the specified time\n");
 236                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5", NULL);
 237                 break;
 238         }
 239         return 1;
 240 }
 241
 242 /**
 243  * zfcp_ccw_shutdown - handle shutdown from cio
 244  * @cdev: device for adapter to shutdown.
 245  */
 246 static void zfcp_ccw_shutdown(struct ccw_device *cdev)
 247 {
 248         struct zfcp_adapter *adapter;
 249
 250         mutex_lock(&zfcp_data.config_mutex);
 251         adapter = dev_get_drvdata(&cdev->dev);
 252         if (!adapter)
 253                 goto out;
 254
 255         zfcp_erp_adapter_shutdown(adapter, 0, "ccshut1", NULL);
 256         zfcp_erp_wait(adapter);
 257         zfcp_erp_thread_kill(adapter);
 258 out:
 259         mutex_unlock(&zfcp_data.config_mutex);
 260 }
 261
 262 struct ccw_driver zfcp_ccw_driver = {
 263         .owner       = THIS_MODULE,
 264         .name        = "zfcp",
 265         .ids         = zfcp_ccw_device_id,
 266         .probe       = zfcp_ccw_probe,
 267         .remove      = zfcp_ccw_remove,
 268         .set_online  = zfcp_ccw_set_online,
 269         .set_offline = zfcp_ccw_set_offline,
 270         .notify      = zfcp_ccw_notify,
 271         .shutdown    = zfcp_ccw_shutdown,
 272         .freeze      = zfcp_ccw_suspend,
 273         .thaw        = zfcp_ccw_activate,
 274         .restore     = zfcp_ccw_activate,
 275 };
 276
 277 /**
 278  * zfcp_ccw_register - ccw register function
 279  *
 280  * Registers the driver at the common i/o layer. This function will be called
 281  * at module load time/system start.
 282  */
 283 int __init zfcp_ccw_register(void)
 284 {
 285         return ccw_driver_register(&zfcp_ccw_driver);
 286 }