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         mutex_unlock(&zfcp_data.config_mutex);
 106
 107         cancel_work_sync(&adapter->scan_work);
 108
 109         mutex_lock(&zfcp_data.config_mutex);
 110         write_lock_irq(&zfcp_data.config_lock);
 111         list_for_each_entry_safe(port, p, &adapter->port_list_head, list) {
 112                 list_for_each_entry_safe(unit, u, &port->unit_list_head, list) {
 113                         list_move(&unit->list, &unit_remove_lh);
 114                         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE,
 115                                         &unit->status);
 116                 }
 117                 list_move(&port->list, &port_remove_lh);
 118                 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
 119         }
 120         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
 121         write_unlock_irq(&zfcp_data.config_lock);
 122
 123         list_for_each_entry_safe(port, p, &port_remove_lh, list) {
 124                 list_for_each_entry_safe(unit, u, &unit_remove_lh, list) {
 125                         if (unit->device)
 126                                 scsi_remove_device(unit->device);
 127                         zfcp_unit_dequeue(unit);
 128                 }
 129                 zfcp_port_dequeue(port);
 130         }
 131         wait_event(adapter->remove_wq, atomic_read(&adapter->refcount) == 0);
 132         zfcp_adapter_dequeue(adapter);
 133
 134 out:
 135         mutex_unlock(&zfcp_data.config_mutex);
 136 }
 137
 138 /**
 139  * zfcp_ccw_set_online - set_online function of zfcp driver
 140  * @ccw_device: pointer to belonging ccw device
 141  *
 142  * This function gets called by the common i/o layer and sets an
 143  * adapter into state online.  The first call will allocate all
 144  * adapter resources that will be retained until the device is removed
 145  * via zfcp_ccw_remove.
 146  *
 147  * Setting an fcp device online means that it will be registered with
 148  * the SCSI stack, that the QDIO queues will be set up and that the
 149  * adapter will be opened.
 150  */
 151 static int zfcp_ccw_set_online(struct ccw_device *ccw_device)
 152 {
 153         struct zfcp_adapter *adapter;
 154         int ret = 0;
 155
 156         mutex_lock(&zfcp_data.config_mutex);
 157         adapter = dev_get_drvdata(&ccw_device->dev);
 158
 159         if (!adapter) {
 160                 ret = zfcp_adapter_enqueue(ccw_device);
 161                 if (ret) {
 162                         dev_err(&ccw_device->dev,
 163                                 "Setting up data structures for the "
 164                                 "FCP adapter failed\n");
 165                         goto out;
 166                 }
 167                 adapter = dev_get_drvdata(&ccw_device->dev);
 168         }
 169
 170         /* initialize request counter */
 171         BUG_ON(!zfcp_reqlist_isempty(adapter));
 172         adapter->req_no = 0;
 173
 174         zfcp_erp_modify_adapter_status(adapter, "ccsonl1", NULL,
 175                                        ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
 176         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
 177                                 "ccsonl2", NULL);
 178         zfcp_erp_wait(adapter);
 179 out:
 180         mutex_unlock(&zfcp_data.config_mutex);
 181         if (!ret)
 182                 flush_work(&adapter->scan_work);
 183         return ret;
 184 }
 185
 186 /**
 187  * zfcp_ccw_set_offline - set_offline function of zfcp driver
 188  * @ccw_device: pointer to belonging ccw device
 189  *
 190  * This function gets called by the common i/o layer and sets an adapter
 191  * into state offline.
 192  */
 193 static int zfcp_ccw_set_offline(struct ccw_device *ccw_device)
 194 {
 195         struct zfcp_adapter *adapter;
 196
 197         mutex_lock(&zfcp_data.config_mutex);
 198         adapter = dev_get_drvdata(&ccw_device->dev);
 199         zfcp_erp_adapter_shutdown(adapter, 0, "ccsoff1", NULL);
 200         zfcp_erp_wait(adapter);
 201         mutex_unlock(&zfcp_data.config_mutex);
 202         return 0;
 203 }
 204
 205 /**
 206  * zfcp_ccw_notify - ccw notify function
 207  * @ccw_device: pointer to belonging ccw device
 208  * @event: indicates if adapter was detached or attached
 209  *
 210  * This function gets called by the common i/o layer if an adapter has gone
 211  * or reappeared.
 212  */
 213 static int zfcp_ccw_notify(struct ccw_device *ccw_device, int event)
 214 {
 215         struct zfcp_adapter *adapter = dev_get_drvdata(&ccw_device->dev);
 216
 217         switch (event) {
 218         case CIO_GONE:
 219                 dev_warn(&adapter->ccw_device->dev,
 220                          "The FCP device has been detached\n");
 221                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti1", NULL);
 222                 break;
 223         case CIO_NO_PATH:
 224                 dev_warn(&adapter->ccw_device->dev,
 225                          "The CHPID for the FCP device is offline\n");
 226                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti2", NULL);
 227                 break;
 228         case CIO_OPER:
 229                 dev_info(&adapter->ccw_device->dev,
 230                          "The FCP device is operational again\n");
 231                 zfcp_erp_modify_adapter_status(adapter, "ccnoti3", NULL,
 232                                                ZFCP_STATUS_COMMON_RUNNING,
 233                                                ZFCP_SET);
 234                 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
 235                                         "ccnoti4", NULL);
 236                 break;
 237         case CIO_BOXED:
 238                 dev_warn(&adapter->ccw_device->dev, "The FCP device "
 239                          "did not respond within the specified time\n");
 240                 zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5", NULL);
 241                 break;
 242         }
 243         return 1;
 244 }
 245
 246 /**
 247  * zfcp_ccw_shutdown - handle shutdown from cio
 248  * @cdev: device for adapter to shutdown.
 249  */
 250 static void zfcp_ccw_shutdown(struct ccw_device *cdev)
 251 {
 252         struct zfcp_adapter *adapter;
 253
 254         mutex_lock(&zfcp_data.config_mutex);
 255         adapter = dev_get_drvdata(&cdev->dev);
 256         if (!adapter)
 257                 goto out;
 258
 259         zfcp_erp_adapter_shutdown(adapter, 0, "ccshut1", NULL);
 260         zfcp_erp_wait(adapter);
 261         zfcp_erp_thread_kill(adapter);
 262 out:
 263         mutex_unlock(&zfcp_data.config_mutex);
 264 }
 265
 266 struct ccw_driver zfcp_ccw_driver = {
 267         .owner       = THIS_MODULE,
 268         .name        = "zfcp",
 269         .ids         = zfcp_ccw_device_id,
 270         .probe       = zfcp_ccw_probe,
 271         .remove      = zfcp_ccw_remove,
 272         .set_online  = zfcp_ccw_set_online,
 273         .set_offline = zfcp_ccw_set_offline,
 274         .notify      = zfcp_ccw_notify,
 275         .shutdown    = zfcp_ccw_shutdown,
 276         .freeze      = zfcp_ccw_suspend,
 277         .thaw        = zfcp_ccw_activate,
 278         .restore     = zfcp_ccw_activate,
 279 };
 280
 281 /**
 282  * zfcp_ccw_register - ccw register function
 283  *
 284  * Registers the driver at the common i/o layer. This function will be called
 285  * at module load time/system start.
 286  */
 287 int __init zfcp_ccw_register(void)
 288 {
 289         return ccw_driver_register(&zfcp_ccw_driver);
 290 }