drivers/s390/scsi/zfcp_aux.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Module interface and handling of zfcp data structures.
   5  *
   6  * Copyright IBM Corporation 2002, 2008
   7  */
   8
   9 /*
  10  * Driver authors:
  11  *            Martin Peschke (originator of the driver)
  12  *            Raimund Schroeder
  13  *            Aron Zeh
  14  *            Wolfgang Taphorn
  15  *            Stefan Bader
  16  *            Heiko Carstens (kernel 2.6 port of the driver)
  17  *            Andreas Herrmann
  18  *            Maxim Shchetynin
  19  *            Volker Sameske
  20  *            Ralph Wuerthner
  21  *            Michael Loehr
  22  *            Swen Schillig
  23  *            Christof Schmitt
  24  *            Martin Petermann
  25  *            Sven Schuetz
  26  */
  27
  28 #include <linux/miscdevice.h>
  29 #include "zfcp_ext.h"
  30
  31 static char *device;
  32
  33 MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com");
  34 MODULE_DESCRIPTION("FCP HBA driver");
  35 MODULE_LICENSE("GPL");
  36
  37 module_param(device, charp, 0400);
  38 MODULE_PARM_DESC(device, "specify initial device");
  39
  40 static int zfcp_reqlist_alloc(struct zfcp_adapter *adapter)
  41 {
  42         int idx;
  43
  44         adapter->req_list = kcalloc(REQUEST_LIST_SIZE, sizeof(struct list_head),
  45                                     GFP_KERNEL);
  46         if (!adapter->req_list)
  47                 return -ENOMEM;
  48
  49         for (idx = 0; idx < REQUEST_LIST_SIZE; idx++)
  50                 INIT_LIST_HEAD(&adapter->req_list[idx]);
  51         return 0;
  52 }
  53
  54 /**
  55  * zfcp_reqlist_isempty - is the request list empty
  56  * @adapter: pointer to struct zfcp_adapter
  57  *
  58  * Returns: true if list is empty, false otherwise
  59  */
  60 int zfcp_reqlist_isempty(struct zfcp_adapter *adapter)
  61 {
  62         unsigned int idx;
  63
  64         for (idx = 0; idx < REQUEST_LIST_SIZE; idx++)
  65                 if (!list_empty(&adapter->req_list[idx]))
  66                         return 0;
  67         return 1;
  68 }
  69
  70 static int __init zfcp_device_setup(char *devstr)
  71 {
  72         char *token;
  73         char *str;
  74
  75         if (!devstr)
  76                 return 0;
  77
  78         /* duplicate devstr and keep the original for sysfs presentation*/
  79         str = kmalloc(strlen(devstr) + 1, GFP_KERNEL);
  80         if (!str)
  81                 return 0;
  82
  83         strcpy(str, devstr);
  84
  85         token = strsep(&str, ",");
  86         if (!token || strlen(token) >= BUS_ID_SIZE)
  87                 goto err_out;
  88         strncpy(zfcp_data.init_busid, token, BUS_ID_SIZE);
  89
  90         token = strsep(&str, ",");
  91         if (!token || strict_strtoull(token, 0, &zfcp_data.init_wwpn))
  92                 goto err_out;
  93
  94         token = strsep(&str, ",");
  95         if (!token || strict_strtoull(token, 0, &zfcp_data.init_fcp_lun))
  96                 goto err_out;
  97
  98         kfree(str);
  99         return 1;
 100
 101  err_out:
 102         kfree(str);
 103         pr_err("zfcp: Parse error for device parameter string %s, "
 104                "device not attached.\n", devstr);
 105         return 0;
 106 }
 107
 108 static struct zfcp_adapter *zfcp_get_adapter_by_busid(char *bus_id)
 109 {
 110         struct zfcp_adapter *adapter;
 111
 112         list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list)
 113                 if ((strncmp(bus_id, adapter->ccw_device->dev.bus_id,
 114                              BUS_ID_SIZE) == 0) &&
 115                     !(atomic_read(&adapter->status) &
 116                       ZFCP_STATUS_COMMON_REMOVE))
 117                     return adapter;
 118         return NULL;
 119 }
 120
 121 static void __init zfcp_init_device_configure(void)
 122 {
 123         struct zfcp_adapter *adapter;
 124         struct zfcp_port *port;
 125         struct zfcp_unit *unit;
 126
 127         down(&zfcp_data.config_sema);
 128         read_lock_irq(&zfcp_data.config_lock);
 129         adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
 130         if (adapter)
 131                 zfcp_adapter_get(adapter);
 132         read_unlock_irq(&zfcp_data.config_lock);
 133
 134         if (!adapter)
 135                 goto out_adapter;
 136         port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
 137         if (IS_ERR(port))
 138                 goto out_port;
 139         unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
 140         if (IS_ERR(unit))
 141                 goto out_unit;
 142         up(&zfcp_data.config_sema);
 143         ccw_device_set_online(adapter->ccw_device);
 144         zfcp_erp_wait(adapter);
 145         down(&zfcp_data.config_sema);
 146         zfcp_unit_put(unit);
 147 out_unit:
 148         zfcp_port_put(port);
 149 out_port:
 150         zfcp_adapter_put(adapter);
 151 out_adapter:
 152         up(&zfcp_data.config_sema);
 153         return;
 154 }
 155
 156 static struct kmem_cache *zfcp_cache_create(int size, char *name)
 157 {
 158         int align = 1;
 159         while ((size - align) > 0)
 160                 align <<= 1;
 161         return kmem_cache_create(name , size, align, 0, NULL);
 162 }
 163
 164 static int __init zfcp_module_init(void)
 165 {
 166         int retval = -ENOMEM;
 167
 168         zfcp_data.fsf_req_qtcb_cache = zfcp_cache_create(
 169                         sizeof(struct zfcp_fsf_req_qtcb), "zfcp_fsf");
 170         if (!zfcp_data.fsf_req_qtcb_cache)
 171                 goto out;
 172
 173         zfcp_data.sr_buffer_cache = zfcp_cache_create(
 174                         sizeof(struct fsf_status_read_buffer), "zfcp_sr");
 175         if (!zfcp_data.sr_buffer_cache)
 176                 goto out_sr_cache;
 177
 178         zfcp_data.gid_pn_cache = zfcp_cache_create(
 179                         sizeof(struct zfcp_gid_pn_data), "zfcp_gid");
 180         if (!zfcp_data.gid_pn_cache)
 181                 goto out_gid_cache;
 182
 183         INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
 184         INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
 185
 186         sema_init(&zfcp_data.config_sema, 1);
 187         rwlock_init(&zfcp_data.config_lock);
 188
 189         zfcp_data.scsi_transport_template =
 190                 fc_attach_transport(&zfcp_transport_functions);
 191         if (!zfcp_data.scsi_transport_template)
 192                 goto out_transport;
 193
 194         retval = misc_register(&zfcp_cfdc_misc);
 195         if (retval) {
 196                 pr_err("zfcp: registration of misc device zfcp_cfdc failed\n");
 197                 goto out_misc;
 198         }
 199
 200         retval = zfcp_ccw_register();
 201         if (retval) {
 202                 pr_err("zfcp: Registration with common I/O layer failed.\n");
 203                 goto out_ccw_register;
 204         }
 205
 206         if (zfcp_device_setup(device))
 207                 zfcp_init_device_configure();
 208
 209         goto out;
 210
 211 out_ccw_register:
 212         misc_deregister(&zfcp_cfdc_misc);
 213 out_misc:
 214         fc_release_transport(zfcp_data.scsi_transport_template);
 215 out_transport:
 216         kmem_cache_destroy(zfcp_data.gid_pn_cache);
 217 out_gid_cache:
 218         kmem_cache_destroy(zfcp_data.sr_buffer_cache);
 219 out_sr_cache:
 220         kmem_cache_destroy(zfcp_data.fsf_req_qtcb_cache);
 221 out:
 222         return retval;
 223 }
 224
 225 module_init(zfcp_module_init);
 226
 227 /**
 228  * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
 229  * @port: pointer to port to search for unit
 230  * @fcp_lun: FCP LUN to search for
 231  *
 232  * Returns: pointer to zfcp_unit or NULL
 233  */
 234 struct zfcp_unit *zfcp_get_unit_by_lun(struct zfcp_port *port,
 235                                        fcp_lun_t fcp_lun)
 236 {
 237         struct zfcp_unit *unit;
 238
 239         list_for_each_entry(unit, &port->unit_list_head, list)
 240                 if ((unit->fcp_lun == fcp_lun) &&
 241                     !(atomic_read(&unit->status) & ZFCP_STATUS_COMMON_REMOVE))
 242                     return unit;
 243         return NULL;
 244 }
 245
 246 /**
 247  * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
 248  * @adapter: pointer to adapter to search for port
 249  * @wwpn: wwpn to search for
 250  *
 251  * Returns: pointer to zfcp_port or NULL
 252  */
 253 struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter,
 254                                         wwn_t wwpn)
 255 {
 256         struct zfcp_port *port;
 257
 258         list_for_each_entry(port, &adapter->port_list_head, list)
 259                 if ((port->wwpn == wwpn) && !(atomic_read(&port->status) &
 260                       (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE)))
 261                         return port;
 262         return NULL;
 263 }
 264
 265 /**
 266  * zfcp_unit_enqueue - enqueue unit to unit list of a port.
 267  * @port: pointer to port where unit is added
 268  * @fcp_lun: FCP LUN of unit to be enqueued
 269  * Returns: pointer to enqueued unit on success, ERR_PTR on error
 270  * Locks: config_sema must be held to serialize changes to the unit list
 271  *
 272  * Sets up some unit internal structures and creates sysfs entry.
 273  */
 274 struct zfcp_unit *zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
 275 {
 276         struct zfcp_unit *unit;
 277
 278         unit = kzalloc(sizeof(struct zfcp_unit), GFP_KERNEL);
 279         if (!unit)
 280                 return ERR_PTR(-ENOMEM);
 281
 282         atomic_set(&unit->refcount, 0);
 283         init_waitqueue_head(&unit->remove_wq);
 284
 285         unit->port = port;
 286         unit->fcp_lun = fcp_lun;
 287
 288         snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
 289         unit->sysfs_device.parent = &port->sysfs_device;
 290         unit->sysfs_device.release = zfcp_sysfs_unit_release;
 291         dev_set_drvdata(&unit->sysfs_device, unit);
 292
 293         /* mark unit unusable as long as sysfs registration is not complete */
 294         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 295
 296         spin_lock_init(&unit->latencies.lock);
 297         unit->latencies.write.channel.min = 0xFFFFFFFF;
 298         unit->latencies.write.fabric.min = 0xFFFFFFFF;
 299         unit->latencies.read.channel.min = 0xFFFFFFFF;
 300         unit->latencies.read.fabric.min = 0xFFFFFFFF;
 301         unit->latencies.cmd.channel.min = 0xFFFFFFFF;
 302         unit->latencies.cmd.fabric.min = 0xFFFFFFFF;
 303
 304         read_lock_irq(&zfcp_data.config_lock);
 305         if (zfcp_get_unit_by_lun(port, fcp_lun)) {
 306                 read_unlock_irq(&zfcp_data.config_lock);
 307                 goto err_out_free;
 308         }
 309         read_unlock_irq(&zfcp_data.config_lock);
 310
 311         if (device_register(&unit->sysfs_device))
 312                 goto err_out_free;
 313
 314         if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
 315                 device_unregister(&unit->sysfs_device);
 316                 return ERR_PTR(-EIO);
 317         }
 318
 319         zfcp_unit_get(unit);
 320         unit->scsi_lun = scsilun_to_int((struct scsi_lun *)&unit->fcp_lun);
 321
 322         write_lock_irq(&zfcp_data.config_lock);
 323         list_add_tail(&unit->list, &port->unit_list_head);
 324         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 325         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
 326
 327         write_unlock_irq(&zfcp_data.config_lock);
 328
 329         port->units++;
 330         zfcp_port_get(port);
 331
 332         return unit;
 333
 334 err_out_free:
 335         kfree(unit);
 336         return ERR_PTR(-EINVAL);
 337 }
 338
 339 /**
 340  * zfcp_unit_dequeue - dequeue unit
 341  * @unit: pointer to zfcp_unit
 342  *
 343  * waits until all work is done on unit and removes it then from the unit->list
 344  * of the associated port.
 345  */
 346 void zfcp_unit_dequeue(struct zfcp_unit *unit)
 347 {
 348         zfcp_unit_wait(unit);
 349         write_lock_irq(&zfcp_data.config_lock);
 350         list_del(&unit->list);
 351         write_unlock_irq(&zfcp_data.config_lock);
 352         unit->port->units--;
 353         zfcp_port_put(unit->port);
 354         zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
 355         device_unregister(&unit->sysfs_device);
 356 }
 357
 358 static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
 359 {
 360         /* must only be called with zfcp_data.config_sema taken */
 361         adapter->pool.fsf_req_erp =
 362                 mempool_create_slab_pool(1, zfcp_data.fsf_req_qtcb_cache);
 363         if (!adapter->pool.fsf_req_erp)
 364                 return -ENOMEM;
 365
 366         adapter->pool.fsf_req_scsi =
 367                 mempool_create_slab_pool(1, zfcp_data.fsf_req_qtcb_cache);
 368         if (!adapter->pool.fsf_req_scsi)
 369                 return -ENOMEM;
 370
 371         adapter->pool.fsf_req_abort =
 372                 mempool_create_slab_pool(1, zfcp_data.fsf_req_qtcb_cache);
 373         if (!adapter->pool.fsf_req_abort)
 374                 return -ENOMEM;
 375
 376         adapter->pool.fsf_req_status_read =
 377                 mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM,
 378                                             sizeof(struct zfcp_fsf_req));
 379         if (!adapter->pool.fsf_req_status_read)
 380                 return -ENOMEM;
 381
 382         adapter->pool.data_status_read =
 383                 mempool_create_slab_pool(FSF_STATUS_READS_RECOM,
 384                                          zfcp_data.sr_buffer_cache);
 385         if (!adapter->pool.data_status_read)
 386                 return -ENOMEM;
 387
 388         adapter->pool.data_gid_pn =
 389                 mempool_create_slab_pool(1, zfcp_data.gid_pn_cache);
 390         if (!adapter->pool.data_gid_pn)
 391                 return -ENOMEM;
 392
 393         return 0;
 394 }
 395
 396 static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
 397 {
 398         /* zfcp_data.config_sema must be held */
 399         if (adapter->pool.fsf_req_erp)
 400                 mempool_destroy(adapter->pool.fsf_req_erp);
 401         if (adapter->pool.fsf_req_scsi)
 402                 mempool_destroy(adapter->pool.fsf_req_scsi);
 403         if (adapter->pool.fsf_req_abort)
 404                 mempool_destroy(adapter->pool.fsf_req_abort);
 405         if (adapter->pool.fsf_req_status_read)
 406                 mempool_destroy(adapter->pool.fsf_req_status_read);
 407         if (adapter->pool.data_status_read)
 408                 mempool_destroy(adapter->pool.data_status_read);
 409         if (adapter->pool.data_gid_pn)
 410                 mempool_destroy(adapter->pool.data_gid_pn);
 411 }
 412
 413 static void zfcp_dummy_release(struct device *dev)
 414 {
 415         return;
 416 }
 417
 418 /**
 419  * zfcp_status_read_refill - refill the long running status_read_requests
 420  * @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled
 421  *
 422  * Returns: 0 on success, 1 otherwise
 423  *
 424  * if there are 16 or more status_read requests missing an adapter_reopen
 425  * is triggered
 426  */
 427 int zfcp_status_read_refill(struct zfcp_adapter *adapter)
 428 {
 429         while (atomic_read(&adapter->stat_miss) > 0)
 430                 if (zfcp_fsf_status_read(adapter, ZFCP_WAIT_FOR_SBAL)) {
 431                         if (atomic_read(&adapter->stat_miss) >= 16) {
 432                                 zfcp_erp_adapter_reopen(adapter, 0, 103, NULL);
 433                                 return 1;
 434                         }
 435                         break;
 436                 } else
 437                         atomic_dec(&adapter->stat_miss);
 438         return 0;
 439 }
 440
 441 static void _zfcp_status_read_scheduler(struct work_struct *work)
 442 {
 443         zfcp_status_read_refill(container_of(work, struct zfcp_adapter,
 444                                              stat_work));
 445 }
 446
 447 static int zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
 448 {
 449         struct zfcp_port *port;
 450
 451         port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
 452                                  ZFCP_DID_DIRECTORY_SERVICE);
 453         if (IS_ERR(port))
 454                 return PTR_ERR(port);
 455         zfcp_port_put(port);
 456
 457         return 0;
 458 }
 459
 460 /**
 461  * zfcp_adapter_enqueue - enqueue a new adapter to the list
 462  * @ccw_device: pointer to the struct cc_device
 463  *
 464  * Returns:     0             if a new adapter was successfully enqueued
 465  *              -ENOMEM       if alloc failed
 466  * Enqueues an adapter at the end of the adapter list in the driver data.
 467  * All adapter internal structures are set up.
 468  * Proc-fs entries are also created.
 469  * locks:       config_sema must be held to serialise changes to the adapter list
 470  */
 471 int zfcp_adapter_enqueue(struct ccw_device *ccw_device)
 472 {
 473         struct zfcp_adapter *adapter;
 474
 475         /*
 476          * Note: It is safe to release the list_lock, as any list changes
 477          * are protected by the config_sema, which must be held to get here
 478          */
 479
 480         adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL);
 481         if (!adapter)
 482                 return -ENOMEM;
 483
 484         ccw_device->handler = NULL;
 485         adapter->ccw_device = ccw_device;
 486         atomic_set(&adapter->refcount, 0);
 487
 488         if (zfcp_qdio_allocate(adapter))
 489                 goto qdio_allocate_failed;
 490
 491         if (zfcp_allocate_low_mem_buffers(adapter))
 492                 goto failed_low_mem_buffers;
 493
 494         if (zfcp_reqlist_alloc(adapter))
 495                 goto failed_low_mem_buffers;
 496
 497         if (zfcp_adapter_debug_register(adapter))
 498                 goto debug_register_failed;
 499
 500         init_waitqueue_head(&adapter->remove_wq);
 501         init_waitqueue_head(&adapter->erp_thread_wqh);
 502         init_waitqueue_head(&adapter->erp_done_wqh);
 503
 504         INIT_LIST_HEAD(&adapter->port_list_head);
 505         INIT_LIST_HEAD(&adapter->port_remove_lh);
 506         INIT_LIST_HEAD(&adapter->erp_ready_head);
 507         INIT_LIST_HEAD(&adapter->erp_running_head);
 508
 509         spin_lock_init(&adapter->req_list_lock);
 510
 511         spin_lock_init(&adapter->hba_dbf_lock);
 512         spin_lock_init(&adapter->san_dbf_lock);
 513         spin_lock_init(&adapter->scsi_dbf_lock);
 514         spin_lock_init(&adapter->rec_dbf_lock);
 515
 516         rwlock_init(&adapter->erp_lock);
 517         rwlock_init(&adapter->abort_lock);
 518         rwlock_init(&adapter->req_q.lock);
 519
 520         sema_init(&adapter->erp_ready_sem, 0);
 521
 522         INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
 523         INIT_WORK(&adapter->scan_work, _zfcp_scan_ports_later);
 524
 525         /* mark adapter unusable as long as sysfs registration is not complete */
 526         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
 527
 528         dev_set_drvdata(&ccw_device->dev, adapter);
 529
 530         if (zfcp_sysfs_adapter_create_files(&ccw_device->dev))
 531                 goto sysfs_failed;
 532
 533         adapter->generic_services.parent = &adapter->ccw_device->dev;
 534         adapter->generic_services.release = zfcp_dummy_release;
 535         snprintf(adapter->generic_services.bus_id, BUS_ID_SIZE,
 536                  "generic_services");
 537
 538         if (device_register(&adapter->generic_services))
 539                 goto generic_services_failed;
 540
 541         write_lock_irq(&zfcp_data.config_lock);
 542         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
 543         list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
 544         write_unlock_irq(&zfcp_data.config_lock);
 545
 546         zfcp_data.adapters++;
 547
 548         zfcp_nameserver_enqueue(adapter);
 549
 550         return 0;
 551
 552 generic_services_failed:
 553         zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
 554 sysfs_failed:
 555         zfcp_adapter_debug_unregister(adapter);
 556 debug_register_failed:
 557         dev_set_drvdata(&ccw_device->dev, NULL);
 558         kfree(adapter->req_list);
 559 failed_low_mem_buffers:
 560         zfcp_free_low_mem_buffers(adapter);
 561 qdio_allocate_failed:
 562         zfcp_qdio_free(adapter);
 563         kfree(adapter);
 564         return -ENOMEM;
 565 }
 566
 567 /**
 568  * zfcp_adapter_dequeue - remove the adapter from the resource list
 569  * @adapter: pointer to struct zfcp_adapter which should be removed
 570  * locks:       adapter list write lock is assumed to be held by caller
 571  */
 572 void zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
 573 {
 574         int retval = 0;
 575         unsigned long flags;
 576
 577         cancel_work_sync(&adapter->scan_work);
 578         cancel_work_sync(&adapter->stat_work);
 579         zfcp_adapter_scsi_unregister(adapter);
 580         device_unregister(&adapter->generic_services);
 581         zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
 582         dev_set_drvdata(&adapter->ccw_device->dev, NULL);
 583         /* sanity check: no pending FSF requests */
 584         spin_lock_irqsave(&adapter->req_list_lock, flags);
 585         retval = zfcp_reqlist_isempty(adapter);
 586         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 587         if (!retval)
 588                 return;
 589
 590         zfcp_adapter_debug_unregister(adapter);
 591
 592         /* remove specified adapter data structure from list */
 593         write_lock_irq(&zfcp_data.config_lock);
 594         list_del(&adapter->list);
 595         write_unlock_irq(&zfcp_data.config_lock);
 596
 597         /* decrease number of adapters in list */
 598         zfcp_data.adapters--;
 599
 600         zfcp_qdio_free(adapter);
 601
 602         zfcp_free_low_mem_buffers(adapter);
 603         kfree(adapter->req_list);
 604         kfree(adapter->fc_stats);
 605         kfree(adapter->stats_reset_data);
 606         kfree(adapter);
 607 }
 608
 609 /**
 610  * zfcp_port_enqueue - enqueue port to port list of adapter
 611  * @adapter: adapter where remote port is added
 612  * @wwpn: WWPN of the remote port to be enqueued
 613  * @status: initial status for the port
 614  * @d_id: destination id of the remote port to be enqueued
 615  * Returns: pointer to enqueued port on success, ERR_PTR on error
 616  * Locks: config_sema must be held to serialize changes to the port list
 617  *
 618  * All port internal structures are set up and the sysfs entry is generated.
 619  * d_id is used to enqueue ports with a well known address like the Directory
 620  * Service for nameserver lookup.
 621  */
 622 struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn,
 623                                      u32 status, u32 d_id)
 624 {
 625         struct zfcp_port *port;
 626         char *bus_id;
 627
 628         port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL);
 629         if (!port)
 630                 return ERR_PTR(-ENOMEM);
 631
 632         init_waitqueue_head(&port->remove_wq);
 633
 634         INIT_LIST_HEAD(&port->unit_list_head);
 635         INIT_LIST_HEAD(&port->unit_remove_lh);
 636
 637         port->adapter = adapter;
 638         port->d_id = d_id;
 639         port->wwpn = wwpn;
 640
 641         /* mark port unusable as long as sysfs registration is not complete */
 642         atomic_set_mask(status | ZFCP_STATUS_COMMON_REMOVE, &port->status);
 643         atomic_set(&port->refcount, 0);
 644
 645         if (status & ZFCP_STATUS_PORT_WKA) {
 646                 switch (d_id) {
 647                 case ZFCP_DID_DIRECTORY_SERVICE:
 648                         bus_id = "directory";
 649                         break;
 650                 case ZFCP_DID_MANAGEMENT_SERVICE:
 651                         bus_id = "management";
 652                         break;
 653                 case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
 654                         bus_id = "key_distribution";
 655                         break;
 656                 case ZFCP_DID_ALIAS_SERVICE:
 657                         bus_id = "alias";
 658                         break;
 659                 case ZFCP_DID_TIME_SERVICE:
 660                         bus_id = "time";
 661                         break;
 662                 default:
 663                         kfree(port);
 664                         return ERR_PTR(-EINVAL);
 665                 }
 666                 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE, "%s", bus_id);
 667                 port->sysfs_device.parent = &adapter->generic_services;
 668         } else {
 669                 snprintf(port->sysfs_device.bus_id,
 670                          BUS_ID_SIZE, "0x%016llx", wwpn);
 671                 port->sysfs_device.parent = &adapter->ccw_device->dev;
 672         }
 673
 674         port->sysfs_device.release = zfcp_sysfs_port_release;
 675         dev_set_drvdata(&port->sysfs_device, port);
 676
 677         read_lock_irq(&zfcp_data.config_lock);
 678         if (!(status & ZFCP_STATUS_PORT_NO_WWPN))
 679                 if (zfcp_get_port_by_wwpn(adapter, wwpn)) {
 680                         read_unlock_irq(&zfcp_data.config_lock);
 681                         goto err_out_free;
 682                 }
 683         read_unlock_irq(&zfcp_data.config_lock);
 684
 685         if (device_register(&port->sysfs_device))
 686                 goto err_out_free;
 687
 688         if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
 689                 device_unregister(&port->sysfs_device);
 690                 goto err_out;
 691         }
 692
 693         zfcp_port_get(port);
 694
 695         write_lock_irq(&zfcp_data.config_lock);
 696         list_add_tail(&port->list, &adapter->port_list_head);
 697         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
 698         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
 699         if (d_id == ZFCP_DID_DIRECTORY_SERVICE)
 700                 if (!adapter->nameserver_port)
 701                         adapter->nameserver_port = port;
 702         adapter->ports++;
 703
 704         write_unlock_irq(&zfcp_data.config_lock);
 705
 706         zfcp_adapter_get(adapter);
 707         return port;
 708
 709 err_out_free:
 710         kfree(port);
 711 err_out:
 712         return ERR_PTR(-EINVAL);
 713 }
 714
 715 /**
 716  * zfcp_port_dequeue - dequeues a port from the port list of the adapter
 717  * @port: pointer to struct zfcp_port which should be removed
 718  */
 719 void zfcp_port_dequeue(struct zfcp_port *port)
 720 {
 721         zfcp_port_wait(port);
 722         write_lock_irq(&zfcp_data.config_lock);
 723         list_del(&port->list);
 724         port->adapter->ports--;
 725         write_unlock_irq(&zfcp_data.config_lock);
 726         if (port->rport)
 727                 fc_remote_port_delete(port->rport);
 728         port->rport = NULL;
 729         zfcp_adapter_put(port->adapter);
 730         zfcp_sysfs_port_remove_files(&port->sysfs_device,
 731                                      atomic_read(&port->status));
 732         device_unregister(&port->sysfs_device);
 733 }
 734
 735 /**
 736  * zfcp_sg_free_table - free memory used by scatterlists
 737  * @sg: pointer to scatterlist
 738  * @count: number of scatterlist which are to be free'ed
 739  * the scatterlist are expected to reference pages always
 740  */
 741 void zfcp_sg_free_table(struct scatterlist *sg, int count)
 742 {
 743         int i;
 744
 745         for (i = 0; i < count; i++, sg++)
 746                 if (sg)
 747                         free_page((unsigned long) sg_virt(sg));
 748                 else
 749                         break;
 750 }
 751
 752 /**
 753  * zfcp_sg_setup_table - init scatterlist and allocate, assign buffers
 754  * @sg: pointer to struct scatterlist
 755  * @count: number of scatterlists which should be assigned with buffers
 756  * of size page
 757  *
 758  * Returns: 0 on success, -ENOMEM otherwise
 759  */
 760 int zfcp_sg_setup_table(struct scatterlist *sg, int count)
 761 {
 762         void *addr;
 763         int i;
 764
 765         sg_init_table(sg, count);
 766         for (i = 0; i < count; i++, sg++) {
 767                 addr = (void *) get_zeroed_page(GFP_KERNEL);
 768                 if (!addr) {
 769                         zfcp_sg_free_table(sg, i);
 770                         return -ENOMEM;
 771                 }
 772                 sg_set_buf(sg, addr, PAGE_SIZE);
 773         }
 774         return 0;
 775 }