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