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, 2009
   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 #define KMSG_COMPONENT "zfcp"
  29 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  30
  31 #include <linux/miscdevice.h>
  32 #include <linux/seq_file.h>
  33 #include "zfcp_ext.h"
  34
  35 #define ZFCP_BUS_ID_SIZE        20
  36
  37 MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com");
  38 MODULE_DESCRIPTION("FCP HBA driver");
  39 MODULE_LICENSE("GPL");
  40
  41 static char *init_device;
  42 module_param_named(device, init_device, charp, 0400);
  43 MODULE_PARM_DESC(device, "specify initial device");
  44
  45 static struct kmem_cache *zfcp_cache_hw_align(const char *name,
  46                                               unsigned long size)
  47 {
  48         return kmem_cache_create(name, size, roundup_pow_of_two(size), 0, NULL);
  49 }
  50
  51 static int zfcp_reqlist_alloc(struct zfcp_adapter *adapter)
  52 {
  53         int idx;
  54
  55         adapter->req_list = kcalloc(REQUEST_LIST_SIZE, sizeof(struct list_head),
  56                                     GFP_KERNEL);
  57         if (!adapter->req_list)
  58                 return -ENOMEM;
  59
  60         for (idx = 0; idx < REQUEST_LIST_SIZE; idx++)
  61                 INIT_LIST_HEAD(&adapter->req_list[idx]);
  62         return 0;
  63 }
  64
  65 /**
  66  * zfcp_reqlist_isempty - is the request list empty
  67  * @adapter: pointer to struct zfcp_adapter
  68  *
  69  * Returns: true if list is empty, false otherwise
  70  */
  71 int zfcp_reqlist_isempty(struct zfcp_adapter *adapter)
  72 {
  73         unsigned int idx;
  74
  75         for (idx = 0; idx < REQUEST_LIST_SIZE; idx++)
  76                 if (!list_empty(&adapter->req_list[idx]))
  77                         return 0;
  78         return 1;
  79 }
  80
  81 static void __init zfcp_init_device_configure(char *busid, u64 wwpn, u64 lun)
  82 {
  83         struct zfcp_adapter *adapter;
  84         struct zfcp_port *port;
  85         struct zfcp_unit *unit;
  86
  87         mutex_lock(&zfcp_data.config_mutex);
  88         read_lock_irq(&zfcp_data.config_lock);
  89         adapter = zfcp_get_adapter_by_busid(busid);
  90         if (adapter)
  91                 zfcp_adapter_get(adapter);
  92         read_unlock_irq(&zfcp_data.config_lock);
  93
  94         if (!adapter)
  95                 goto out_adapter;
  96         port = zfcp_port_enqueue(adapter, wwpn, 0, 0);
  97         if (IS_ERR(port))
  98                 goto out_port;
  99         unit = zfcp_unit_enqueue(port, lun);
 100         if (IS_ERR(unit))
 101                 goto out_unit;
 102         mutex_unlock(&zfcp_data.config_mutex);
 103         ccw_device_set_online(adapter->ccw_device);
 104
 105         zfcp_erp_wait(adapter);
 106         flush_work(&unit->scsi_work);
 107
 108         mutex_lock(&zfcp_data.config_mutex);
 109         zfcp_unit_put(unit);
 110 out_unit:
 111         zfcp_port_put(port);
 112 out_port:
 113         zfcp_adapter_put(adapter);
 114 out_adapter:
 115         mutex_unlock(&zfcp_data.config_mutex);
 116         return;
 117 }
 118
 119 static void __init zfcp_init_device_setup(char *devstr)
 120 {
 121         char *token;
 122         char *str;
 123         char busid[ZFCP_BUS_ID_SIZE];
 124         u64 wwpn, lun;
 125
 126         /* duplicate devstr and keep the original for sysfs presentation*/
 127         str = kmalloc(strlen(devstr) + 1, GFP_KERNEL);
 128         if (!str)
 129                 return;
 130
 131         strcpy(str, devstr);
 132
 133         token = strsep(&str, ",");
 134         if (!token || strlen(token) >= ZFCP_BUS_ID_SIZE)
 135                 goto err_out;
 136         strncpy(busid, token, ZFCP_BUS_ID_SIZE);
 137
 138         token = strsep(&str, ",");
 139         if (!token || strict_strtoull(token, 0, (unsigned long long *) &wwpn))
 140                 goto err_out;
 141
 142         token = strsep(&str, ",");
 143         if (!token || strict_strtoull(token, 0, (unsigned long long *) &lun))
 144                 goto err_out;
 145
 146         kfree(str);
 147         zfcp_init_device_configure(busid, wwpn, lun);
 148         return;
 149
 150  err_out:
 151         kfree(str);
 152         pr_err("%s is not a valid SCSI device\n", devstr);
 153 }
 154
 155 static int __init zfcp_module_init(void)
 156 {
 157         int retval = -ENOMEM;
 158
 159         zfcp_data.gpn_ft_cache = zfcp_cache_hw_align("zfcp_gpn",
 160                                         sizeof(struct ct_iu_gpn_ft_req));
 161         if (!zfcp_data.gpn_ft_cache)
 162                 goto out;
 163
 164         zfcp_data.qtcb_cache = zfcp_cache_hw_align("zfcp_qtcb",
 165                                         sizeof(struct fsf_qtcb));
 166         if (!zfcp_data.qtcb_cache)
 167                 goto out_qtcb_cache;
 168
 169         zfcp_data.sr_buffer_cache = zfcp_cache_hw_align("zfcp_sr",
 170                                         sizeof(struct fsf_status_read_buffer));
 171         if (!zfcp_data.sr_buffer_cache)
 172                 goto out_sr_cache;
 173
 174         zfcp_data.gid_pn_cache = zfcp_cache_hw_align("zfcp_gid",
 175                                         sizeof(struct zfcp_gid_pn_data));
 176         if (!zfcp_data.gid_pn_cache)
 177                 goto out_gid_cache;
 178
 179         mutex_init(&zfcp_data.config_mutex);
 180         rwlock_init(&zfcp_data.config_lock);
 181
 182         zfcp_data.scsi_transport_template =
 183                 fc_attach_transport(&zfcp_transport_functions);
 184         if (!zfcp_data.scsi_transport_template)
 185                 goto out_transport;
 186
 187         retval = misc_register(&zfcp_cfdc_misc);
 188         if (retval) {
 189                 pr_err("Registering the misc device zfcp_cfdc failed\n");
 190                 goto out_misc;
 191         }
 192
 193         retval = zfcp_ccw_register();
 194         if (retval) {
 195                 pr_err("The zfcp device driver could not register with "
 196                        "the common I/O layer\n");
 197                 goto out_ccw_register;
 198         }
 199
 200         if (init_device)
 201                 zfcp_init_device_setup(init_device);
 202         return 0;
 203
 204 out_ccw_register:
 205         misc_deregister(&zfcp_cfdc_misc);
 206 out_misc:
 207         fc_release_transport(zfcp_data.scsi_transport_template);
 208 out_transport:
 209         kmem_cache_destroy(zfcp_data.gid_pn_cache);
 210 out_gid_cache:
 211         kmem_cache_destroy(zfcp_data.sr_buffer_cache);
 212 out_sr_cache:
 213         kmem_cache_destroy(zfcp_data.qtcb_cache);
 214 out_qtcb_cache:
 215         kmem_cache_destroy(zfcp_data.gpn_ft_cache);
 216 out:
 217         return retval;
 218 }
 219
 220 module_init(zfcp_module_init);
 221
 222 /**
 223  * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
 224  * @port: pointer to port to search for unit
 225  * @fcp_lun: FCP LUN to search for
 226  *
 227  * Returns: pointer to zfcp_unit or NULL
 228  */
 229 struct zfcp_unit *zfcp_get_unit_by_lun(struct zfcp_port *port, u64 fcp_lun)
 230 {
 231         struct zfcp_unit *unit;
 232
 233         list_for_each_entry(unit, &port->unit_list_head, list)
 234                 if ((unit->fcp_lun == fcp_lun) &&
 235                     !(atomic_read(&unit->status) & ZFCP_STATUS_COMMON_REMOVE))
 236                     return unit;
 237         return NULL;
 238 }
 239
 240 /**
 241  * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
 242  * @adapter: pointer to adapter to search for port
 243  * @wwpn: wwpn to search for
 244  *
 245  * Returns: pointer to zfcp_port or NULL
 246  */
 247 struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter,
 248                                         u64 wwpn)
 249 {
 250         struct zfcp_port *port;
 251
 252         list_for_each_entry(port, &adapter->port_list_head, list)
 253                 if ((port->wwpn == wwpn) &&
 254                     !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_REMOVE))
 255                         return port;
 256         return NULL;
 257 }
 258
 259 static void zfcp_sysfs_unit_release(struct device *dev)
 260 {
 261         kfree(container_of(dev, struct zfcp_unit, sysfs_device));
 262 }
 263
 264 /**
 265  * zfcp_unit_enqueue - enqueue unit to unit list of a port.
 266  * @port: pointer to port where unit is added
 267  * @fcp_lun: FCP LUN of unit to be enqueued
 268  * Returns: pointer to enqueued unit on success, ERR_PTR on error
 269  * Locks: config_mutex must be held to serialize changes to the unit list
 270  *
 271  * Sets up some unit internal structures and creates sysfs entry.
 272  */
 273 struct zfcp_unit *zfcp_unit_enqueue(struct zfcp_port *port, u64 fcp_lun)
 274 {
 275         struct zfcp_unit *unit;
 276
 277         unit = kzalloc(sizeof(struct zfcp_unit), GFP_KERNEL);
 278         if (!unit)
 279                 return ERR_PTR(-ENOMEM);
 280
 281         atomic_set(&unit->refcount, 0);
 282         init_waitqueue_head(&unit->remove_wq);
 283         INIT_WORK(&unit->scsi_work, zfcp_scsi_scan);
 284
 285         unit->port = port;
 286         unit->fcp_lun = fcp_lun;
 287
 288         dev_set_name(&unit->sysfs_device, "0x%016llx",
 289                      (unsigned long long) fcp_lun);
 290         unit->sysfs_device.parent = &port->sysfs_device;
 291         unit->sysfs_device.release = zfcp_sysfs_unit_release;
 292         dev_set_drvdata(&unit->sysfs_device, unit);
 293
 294         /* mark unit unusable as long as sysfs registration is not complete */
 295         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 296
 297         spin_lock_init(&unit->latencies.lock);
 298         unit->latencies.write.channel.min = 0xFFFFFFFF;
 299         unit->latencies.write.fabric.min = 0xFFFFFFFF;
 300         unit->latencies.read.channel.min = 0xFFFFFFFF;
 301         unit->latencies.read.fabric.min = 0xFFFFFFFF;
 302         unit->latencies.cmd.channel.min = 0xFFFFFFFF;
 303         unit->latencies.cmd.fabric.min = 0xFFFFFFFF;
 304
 305         read_lock_irq(&zfcp_data.config_lock);
 306         if (zfcp_get_unit_by_lun(port, fcp_lun)) {
 307                 read_unlock_irq(&zfcp_data.config_lock);
 308                 goto err_out_free;
 309         }
 310         read_unlock_irq(&zfcp_data.config_lock);
 311
 312         if (device_register(&unit->sysfs_device)) {
 313                 put_device(&unit->sysfs_device);
 314                 return ERR_PTR(-EINVAL);
 315         }
 316
 317         if (sysfs_create_group(&unit->sysfs_device.kobj,
 318                                &zfcp_sysfs_unit_attrs)) {
 319                 device_unregister(&unit->sysfs_device);
 320                 return ERR_PTR(-EIO);
 321         }
 322
 323         zfcp_unit_get(unit);
 324
 325         write_lock_irq(&zfcp_data.config_lock);
 326         list_add_tail(&unit->list, &port->unit_list_head);
 327         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 328         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
 329
 330         write_unlock_irq(&zfcp_data.config_lock);
 331
 332         zfcp_port_get(port);
 333
 334         return unit;
 335
 336 err_out_free:
 337         kfree(unit);
 338         return ERR_PTR(-EINVAL);
 339 }
 340
 341 /**
 342  * zfcp_unit_dequeue - dequeue unit
 343  * @unit: pointer to zfcp_unit
 344  *
 345  * waits until all work is done on unit and removes it then from the unit->list
 346  * of the associated port.
 347  */
 348 void zfcp_unit_dequeue(struct zfcp_unit *unit)
 349 {
 350         wait_event(unit->remove_wq, atomic_read(&unit->refcount) == 0);
 351         write_lock_irq(&zfcp_data.config_lock);
 352         list_del(&unit->list);
 353         write_unlock_irq(&zfcp_data.config_lock);
 354         zfcp_port_put(unit->port);
 355         sysfs_remove_group(&unit->sysfs_device.kobj, &zfcp_sysfs_unit_attrs);
 356         device_unregister(&unit->sysfs_device);
 357 }
 358
 359 static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
 360 {
 361         /* must only be called with zfcp_data.config_mutex taken */
 362         adapter->pool.erp_req =
 363                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
 364         if (!adapter->pool.erp_req)
 365                 return -ENOMEM;
 366
 367         adapter->pool.gid_pn_req =
 368                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
 369         if (!adapter->pool.gid_pn_req)
 370                 return -ENOMEM;
 371
 372         adapter->pool.scsi_req =
 373                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
 374         if (!adapter->pool.scsi_req)
 375                 return -ENOMEM;
 376
 377         adapter->pool.scsi_abort =
 378                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
 379         if (!adapter->pool.scsi_abort)
 380                 return -ENOMEM;
 381
 382         adapter->pool.status_read_req =
 383                 mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM,
 384                                             sizeof(struct zfcp_fsf_req));
 385         if (!adapter->pool.status_read_req)
 386                 return -ENOMEM;
 387
 388         adapter->pool.qtcb_pool =
 389                 mempool_create_slab_pool(4, zfcp_data.qtcb_cache);
 390         if (!adapter->pool.qtcb_pool)
 391                 return -ENOMEM;
 392
 393         adapter->pool.status_read_data =
 394                 mempool_create_slab_pool(FSF_STATUS_READS_RECOM,
 395                                          zfcp_data.sr_buffer_cache);
 396         if (!adapter->pool.status_read_data)
 397                 return -ENOMEM;
 398
 399         adapter->pool.gid_pn_data =
 400                 mempool_create_slab_pool(1, zfcp_data.gid_pn_cache);
 401         if (!adapter->pool.gid_pn_data)
 402                 return -ENOMEM;
 403
 404         return 0;
 405 }
 406
 407 static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
 408 {
 409         /* zfcp_data.config_mutex must be held */
 410         if (adapter->pool.erp_req)
 411                 mempool_destroy(adapter->pool.erp_req);
 412         if (adapter->pool.scsi_req)
 413                 mempool_destroy(adapter->pool.scsi_req);
 414         if (adapter->pool.scsi_abort)
 415                 mempool_destroy(adapter->pool.scsi_abort);
 416         if (adapter->pool.qtcb_pool)
 417                 mempool_destroy(adapter->pool.qtcb_pool);
 418         if (adapter->pool.status_read_req)
 419                 mempool_destroy(adapter->pool.status_read_req);
 420         if (adapter->pool.status_read_data)
 421                 mempool_destroy(adapter->pool.status_read_data);
 422         if (adapter->pool.gid_pn_data)
 423                 mempool_destroy(adapter->pool.gid_pn_data);
 424 }
 425
 426 /**
 427  * zfcp_status_read_refill - refill the long running status_read_requests
 428  * @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled
 429  *
 430  * Returns: 0 on success, 1 otherwise
 431  *
 432  * if there are 16 or more status_read requests missing an adapter_reopen
 433  * is triggered
 434  */
 435 int zfcp_status_read_refill(struct zfcp_adapter *adapter)
 436 {
 437         while (atomic_read(&adapter->stat_miss) > 0)
 438                 if (zfcp_fsf_status_read(adapter->qdio)) {
 439                         if (atomic_read(&adapter->stat_miss) >= 16) {
 440                                 zfcp_erp_adapter_reopen(adapter, 0, "axsref1",
 441                                                         NULL);
 442                                 return 1;
 443                         }
 444                         break;
 445                 } else
 446                         atomic_dec(&adapter->stat_miss);
 447         return 0;
 448 }
 449
 450 static void _zfcp_status_read_scheduler(struct work_struct *work)
 451 {
 452         zfcp_status_read_refill(container_of(work, struct zfcp_adapter,
 453                                              stat_work));
 454 }
 455
 456 static void zfcp_print_sl(struct seq_file *m, struct service_level *sl)
 457 {
 458         struct zfcp_adapter *adapter =
 459                 container_of(sl, struct zfcp_adapter, service_level);
 460
 461         seq_printf(m, "zfcp: %s microcode level %x\n",
 462                    dev_name(&adapter->ccw_device->dev),
 463                    adapter->fsf_lic_version);
 464 }
 465
 466 static int zfcp_setup_adapter_work_queue(struct zfcp_adapter *adapter)
 467 {
 468         char name[TASK_COMM_LEN];
 469
 470         snprintf(name, sizeof(name), "zfcp_q_%s",
 471                  dev_name(&adapter->ccw_device->dev));
 472         adapter->work_queue = create_singlethread_workqueue(name);
 473
 474         if (adapter->work_queue)
 475                 return 0;
 476         return -ENOMEM;
 477 }
 478
 479 static void zfcp_destroy_adapter_work_queue(struct zfcp_adapter *adapter)
 480 {
 481         if (adapter->work_queue)
 482                 destroy_workqueue(adapter->work_queue);
 483         adapter->work_queue = NULL;
 484
 485 }
 486
 487 /**
 488  * zfcp_adapter_enqueue - enqueue a new adapter to the list
 489  * @ccw_device: pointer to the struct cc_device
 490  *
 491  * Returns:     0             if a new adapter was successfully enqueued
 492  *              -ENOMEM       if alloc failed
 493  * Enqueues an adapter at the end of the adapter list in the driver data.
 494  * All adapter internal structures are set up.
 495  * Proc-fs entries are also created.
 496  * locks: config_mutex must be held to serialize changes to the adapter list
 497  */
 498 int zfcp_adapter_enqueue(struct ccw_device *ccw_device)
 499 {
 500         struct zfcp_adapter *adapter;
 501
 502         /*
 503          * Note: It is safe to release the list_lock, as any list changes
 504          * are protected by the config_mutex, which must be held to get here
 505          */
 506
 507         adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL);
 508         if (!adapter)
 509                 return -ENOMEM;
 510
 511         ccw_device->handler = NULL;
 512         adapter->ccw_device = ccw_device;
 513         atomic_set(&adapter->refcount, 0);
 514
 515         if (zfcp_qdio_setup(adapter))
 516                 goto qdio_failed;
 517
 518         if (zfcp_allocate_low_mem_buffers(adapter))
 519                 goto low_mem_buffers_failed;
 520
 521         if (zfcp_reqlist_alloc(adapter))
 522                 goto low_mem_buffers_failed;
 523
 524         if (zfcp_dbf_adapter_register(adapter))
 525                 goto debug_register_failed;
 526
 527         if (zfcp_setup_adapter_work_queue(adapter))
 528                 goto work_queue_failed;
 529
 530         if (zfcp_fc_gs_setup(adapter))
 531                 goto generic_services_failed;
 532
 533         init_waitqueue_head(&adapter->remove_wq);
 534         init_waitqueue_head(&adapter->erp_ready_wq);
 535         init_waitqueue_head(&adapter->erp_done_wqh);
 536
 537         INIT_LIST_HEAD(&adapter->port_list_head);
 538         INIT_LIST_HEAD(&adapter->erp_ready_head);
 539         INIT_LIST_HEAD(&adapter->erp_running_head);
 540
 541         spin_lock_init(&adapter->req_list_lock);
 542
 543         rwlock_init(&adapter->erp_lock);
 544         rwlock_init(&adapter->abort_lock);
 545
 546         if (zfcp_erp_thread_setup(adapter))
 547                 goto erp_thread_failed;
 548
 549         INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
 550         INIT_WORK(&adapter->scan_work, _zfcp_fc_scan_ports_later);
 551
 552         adapter->service_level.seq_print = zfcp_print_sl;
 553
 554         /* mark adapter unusable as long as sysfs registration is not complete */
 555         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
 556
 557         dev_set_drvdata(&ccw_device->dev, adapter);
 558
 559         if (sysfs_create_group(&ccw_device->dev.kobj,
 560                                &zfcp_sysfs_adapter_attrs))
 561                 goto sysfs_failed;
 562
 563         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
 564
 565         if (!zfcp_adapter_scsi_register(adapter))
 566                 return 0;
 567
 568 sysfs_failed:
 569         zfcp_erp_thread_kill(adapter);
 570 erp_thread_failed:
 571         zfcp_fc_gs_destroy(adapter);
 572 generic_services_failed:
 573         zfcp_destroy_adapter_work_queue(adapter);
 574 work_queue_failed:
 575         zfcp_dbf_adapter_unregister(adapter->dbf);
 576 debug_register_failed:
 577         dev_set_drvdata(&ccw_device->dev, NULL);
 578         kfree(adapter->req_list);
 579 low_mem_buffers_failed:
 580         zfcp_free_low_mem_buffers(adapter);
 581 qdio_failed:
 582         zfcp_qdio_destroy(adapter->qdio);
 583         kfree(adapter);
 584         return -ENOMEM;
 585 }
 586
 587 /**
 588  * zfcp_adapter_dequeue - remove the adapter from the resource list
 589  * @adapter: pointer to struct zfcp_adapter which should be removed
 590  * locks:       adapter list write lock is assumed to be held by caller
 591  */
 592 void zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
 593 {
 594         int retval = 0;
 595         unsigned long flags;
 596
 597         cancel_work_sync(&adapter->scan_work);
 598         cancel_work_sync(&adapter->stat_work);
 599         zfcp_fc_wka_ports_force_offline(adapter->gs);
 600         zfcp_adapter_scsi_unregister(adapter);
 601         sysfs_remove_group(&adapter->ccw_device->dev.kobj,
 602                            &zfcp_sysfs_adapter_attrs);
 603         dev_set_drvdata(&adapter->ccw_device->dev, NULL);
 604         /* sanity check: no pending FSF requests */
 605         spin_lock_irqsave(&adapter->req_list_lock, flags);
 606         retval = zfcp_reqlist_isempty(adapter);
 607         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 608         if (!retval)
 609                 return;
 610
 611         zfcp_fc_gs_destroy(adapter);
 612         zfcp_erp_thread_kill(adapter);
 613         zfcp_destroy_adapter_work_queue(adapter);
 614         zfcp_dbf_adapter_unregister(adapter->dbf);
 615         zfcp_free_low_mem_buffers(adapter);
 616         zfcp_qdio_destroy(adapter->qdio);
 617         kfree(adapter->req_list);
 618         kfree(adapter->fc_stats);
 619         kfree(adapter->stats_reset_data);
 620         kfree(adapter);
 621 }
 622
 623 static void zfcp_sysfs_port_release(struct device *dev)
 624 {
 625         kfree(container_of(dev, struct zfcp_port, sysfs_device));
 626 }
 627
 628 /**
 629  * zfcp_port_enqueue - enqueue port to port list of adapter
 630  * @adapter: adapter where remote port is added
 631  * @wwpn: WWPN of the remote port to be enqueued
 632  * @status: initial status for the port
 633  * @d_id: destination id of the remote port to be enqueued
 634  * Returns: pointer to enqueued port on success, ERR_PTR on error
 635  * Locks: config_mutex must be held to serialize changes to the port list
 636  *
 637  * All port internal structures are set up and the sysfs entry is generated.
 638  * d_id is used to enqueue ports with a well known address like the Directory
 639  * Service for nameserver lookup.
 640  */
 641 struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn,
 642                                      u32 status, u32 d_id)
 643 {
 644         struct zfcp_port *port;
 645         int retval;
 646
 647         port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL);
 648         if (!port)
 649                 return ERR_PTR(-ENOMEM);
 650
 651         init_waitqueue_head(&port->remove_wq);
 652         INIT_LIST_HEAD(&port->unit_list_head);
 653         INIT_WORK(&port->gid_pn_work, zfcp_fc_port_did_lookup);
 654         INIT_WORK(&port->test_link_work, zfcp_fc_link_test_work);
 655         INIT_WORK(&port->rport_work, zfcp_scsi_rport_work);
 656
 657         port->adapter = adapter;
 658         port->d_id = d_id;
 659         port->wwpn = wwpn;
 660         port->rport_task = RPORT_NONE;
 661
 662         /* mark port unusable as long as sysfs registration is not complete */
 663         atomic_set_mask(status | ZFCP_STATUS_COMMON_REMOVE, &port->status);
 664         atomic_set(&port->refcount, 0);
 665
 666         dev_set_name(&port->sysfs_device, "0x%016llx",
 667                      (unsigned long long)wwpn);
 668         port->sysfs_device.parent = &adapter->ccw_device->dev;
 669
 670         port->sysfs_device.release = zfcp_sysfs_port_release;
 671         dev_set_drvdata(&port->sysfs_device, port);
 672
 673         read_lock_irq(&zfcp_data.config_lock);
 674         if (zfcp_get_port_by_wwpn(adapter, wwpn)) {
 675                 read_unlock_irq(&zfcp_data.config_lock);
 676                 goto err_out_free;
 677         }
 678         read_unlock_irq(&zfcp_data.config_lock);
 679
 680         if (device_register(&port->sysfs_device)) {
 681                 put_device(&port->sysfs_device);
 682                 goto err_out;
 683         }
 684
 685         retval = sysfs_create_group(&port->sysfs_device.kobj,
 686                                     &zfcp_sysfs_port_attrs);
 687
 688         if (retval) {
 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
 700         write_unlock_irq(&zfcp_data.config_lock);
 701
 702         zfcp_adapter_get(adapter);
 703         return port;
 704
 705 err_out_free:
 706         kfree(port);
 707 err_out:
 708         return ERR_PTR(-EINVAL);
 709 }
 710
 711 /**
 712  * zfcp_port_dequeue - dequeues a port from the port list of the adapter
 713  * @port: pointer to struct zfcp_port which should be removed
 714  */
 715 void zfcp_port_dequeue(struct zfcp_port *port)
 716 {
 717         write_lock_irq(&zfcp_data.config_lock);
 718         list_del(&port->list);
 719         write_unlock_irq(&zfcp_data.config_lock);
 720         wait_event(port->remove_wq, atomic_read(&port->refcount) == 0);
 721         cancel_work_sync(&port->rport_work); /* usually not necessary */
 722         zfcp_adapter_put(port->adapter);
 723         sysfs_remove_group(&port->sysfs_device.kobj, &zfcp_sysfs_port_attrs);
 724         device_unregister(&port->sysfs_device);
 725 }
 726
 727 /**
 728  * zfcp_sg_free_table - free memory used by scatterlists
 729  * @sg: pointer to scatterlist
 730  * @count: number of scatterlist which are to be free'ed
 731  * the scatterlist are expected to reference pages always
 732  */
 733 void zfcp_sg_free_table(struct scatterlist *sg, int count)
 734 {
 735         int i;
 736
 737         for (i = 0; i < count; i++, sg++)
 738                 if (sg)
 739                         free_page((unsigned long) sg_virt(sg));
 740                 else
 741                         break;
 742 }
 743
 744 /**
 745  * zfcp_sg_setup_table - init scatterlist and allocate, assign buffers
 746  * @sg: pointer to struct scatterlist
 747  * @count: number of scatterlists which should be assigned with buffers
 748  * of size page
 749  *
 750  * Returns: 0 on success, -ENOMEM otherwise
 751  */
 752 int zfcp_sg_setup_table(struct scatterlist *sg, int count)
 753 {
 754         void *addr;
 755         int i;
 756
 757         sg_init_table(sg, count);
 758         for (i = 0; i < count; i++, sg++) {
 759                 addr = (void *) get_zeroed_page(GFP_KERNEL);
 760                 if (!addr) {
 761                         zfcp_sg_free_table(sg, i);
 762                         return -ENOMEM;
 763                 }
 764                 sg_set_buf(sg, addr, PAGE_SIZE);
 765         }
 766         return 0;
 767 }