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 ccw_device *ccwdev;
  84         struct zfcp_adapter *adapter;
  85         struct zfcp_port *port;
  86         struct zfcp_unit *unit;
  87
  88         ccwdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
  89         if (!ccwdev)
  90                 return;
  91
  92         if (ccw_device_set_online(ccwdev))
  93                 goto out_ccwdev;
  94
  95         mutex_lock(&zfcp_data.config_mutex);
  96         adapter = dev_get_drvdata(&ccwdev->dev);
  97         if (!adapter)
  98                 goto out_unlock;
  99         zfcp_adapter_get(adapter);
 100
 101         port = zfcp_get_port_by_wwpn(adapter, wwpn);
 102         if (!port)
 103                 goto out_port;
 104
 105         zfcp_port_get(port);
 106         unit = zfcp_unit_enqueue(port, lun);
 107         if (IS_ERR(unit))
 108                 goto out_unit;
 109         mutex_unlock(&zfcp_data.config_mutex);
 110
 111         zfcp_erp_unit_reopen(unit, 0, "auidc_1", NULL);
 112         zfcp_erp_wait(adapter);
 113         flush_work(&unit->scsi_work);
 114
 115         mutex_lock(&zfcp_data.config_mutex);
 116         zfcp_unit_put(unit);
 117 out_unit:
 118         zfcp_port_put(port);
 119 out_port:
 120         zfcp_adapter_put(adapter);
 121 out_unlock:
 122         mutex_unlock(&zfcp_data.config_mutex);
 123 out_ccwdev:
 124         put_device(&ccwdev->dev);
 125         return;
 126 }
 127
 128 static void __init zfcp_init_device_setup(char *devstr)
 129 {
 130         char *token;
 131         char *str, *str_saved;
 132         char busid[ZFCP_BUS_ID_SIZE];
 133         u64 wwpn, lun;
 134
 135         /* duplicate devstr and keep the original for sysfs presentation*/
 136         str_saved = kmalloc(strlen(devstr) + 1, GFP_KERNEL);
 137         str = str_saved;
 138         if (!str)
 139                 return;
 140
 141         strcpy(str, devstr);
 142
 143         token = strsep(&str, ",");
 144         if (!token || strlen(token) >= ZFCP_BUS_ID_SIZE)
 145                 goto err_out;
 146         strncpy(busid, token, ZFCP_BUS_ID_SIZE);
 147
 148         token = strsep(&str, ",");
 149         if (!token || strict_strtoull(token, 0, (unsigned long long *) &wwpn))
 150                 goto err_out;
 151
 152         token = strsep(&str, ",");
 153         if (!token || strict_strtoull(token, 0, (unsigned long long *) &lun))
 154                 goto err_out;
 155
 156         kfree(str_saved);
 157         zfcp_init_device_configure(busid, wwpn, lun);
 158         return;
 159
 160 err_out:
 161         kfree(str_saved);
 162         pr_err("%s is not a valid SCSI device\n", devstr);
 163 }
 164
 165 static int __init zfcp_module_init(void)
 166 {
 167         int retval = -ENOMEM;
 168
 169         zfcp_data.gpn_ft_cache = zfcp_cache_hw_align("zfcp_gpn",
 170                                         sizeof(struct ct_iu_gpn_ft_req));
 171         if (!zfcp_data.gpn_ft_cache)
 172                 goto out;
 173
 174         zfcp_data.qtcb_cache = zfcp_cache_hw_align("zfcp_qtcb",
 175                                         sizeof(struct fsf_qtcb));
 176         if (!zfcp_data.qtcb_cache)
 177                 goto out_qtcb_cache;
 178
 179         zfcp_data.sr_buffer_cache = zfcp_cache_hw_align("zfcp_sr",
 180                                         sizeof(struct fsf_status_read_buffer));
 181         if (!zfcp_data.sr_buffer_cache)
 182                 goto out_sr_cache;
 183
 184         zfcp_data.gid_pn_cache = zfcp_cache_hw_align("zfcp_gid",
 185                                         sizeof(struct zfcp_gid_pn_data));
 186         if (!zfcp_data.gid_pn_cache)
 187                 goto out_gid_cache;
 188
 189         mutex_init(&zfcp_data.config_mutex);
 190         rwlock_init(&zfcp_data.config_lock);
 191
 192         zfcp_data.scsi_transport_template =
 193                 fc_attach_transport(&zfcp_transport_functions);
 194         if (!zfcp_data.scsi_transport_template)
 195                 goto out_transport;
 196
 197         retval = misc_register(&zfcp_cfdc_misc);
 198         if (retval) {
 199                 pr_err("Registering the misc device zfcp_cfdc failed\n");
 200                 goto out_misc;
 201         }
 202
 203         retval = zfcp_ccw_register();
 204         if (retval) {
 205                 pr_err("The zfcp device driver could not register with "
 206                        "the common I/O layer\n");
 207                 goto out_ccw_register;
 208         }
 209
 210         if (init_device)
 211                 zfcp_init_device_setup(init_device);
 212         return 0;
 213
 214 out_ccw_register:
 215         misc_deregister(&zfcp_cfdc_misc);
 216 out_misc:
 217         fc_release_transport(zfcp_data.scsi_transport_template);
 218 out_transport:
 219         kmem_cache_destroy(zfcp_data.gid_pn_cache);
 220 out_gid_cache:
 221         kmem_cache_destroy(zfcp_data.sr_buffer_cache);
 222 out_sr_cache:
 223         kmem_cache_destroy(zfcp_data.qtcb_cache);
 224 out_qtcb_cache:
 225         kmem_cache_destroy(zfcp_data.gpn_ft_cache);
 226 out:
 227         return retval;
 228 }
 229
 230 module_init(zfcp_module_init);
 231
 232 /**
 233  * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
 234  * @port: pointer to port to search for unit
 235  * @fcp_lun: FCP LUN to search for
 236  *
 237  * Returns: pointer to zfcp_unit or NULL
 238  */
 239 struct zfcp_unit *zfcp_get_unit_by_lun(struct zfcp_port *port, u64 fcp_lun)
 240 {
 241         struct zfcp_unit *unit;
 242
 243         list_for_each_entry(unit, &port->unit_list_head, list)
 244                 if ((unit->fcp_lun == fcp_lun) &&
 245                     !(atomic_read(&unit->status) & ZFCP_STATUS_COMMON_REMOVE))
 246                     return unit;
 247         return NULL;
 248 }
 249
 250 /**
 251  * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
 252  * @adapter: pointer to adapter to search for port
 253  * @wwpn: wwpn to search for
 254  *
 255  * Returns: pointer to zfcp_port or NULL
 256  */
 257 struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter,
 258                                         u64 wwpn)
 259 {
 260         struct zfcp_port *port;
 261
 262         list_for_each_entry(port, &adapter->port_list_head, list)
 263                 if ((port->wwpn == wwpn) &&
 264                     !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_REMOVE))
 265                         return port;
 266         return NULL;
 267 }
 268
 269 static void zfcp_sysfs_unit_release(struct device *dev)
 270 {
 271         kfree(container_of(dev, struct zfcp_unit, sysfs_device));
 272 }
 273
 274 /**
 275  * zfcp_unit_enqueue - enqueue unit to unit list of a port.
 276  * @port: pointer to port where unit is added
 277  * @fcp_lun: FCP LUN of unit to be enqueued
 278  * Returns: pointer to enqueued unit on success, ERR_PTR on error
 279  * Locks: config_mutex must be held to serialize changes to the unit list
 280  *
 281  * Sets up some unit internal structures and creates sysfs entry.
 282  */
 283 struct zfcp_unit *zfcp_unit_enqueue(struct zfcp_port *port, u64 fcp_lun)
 284 {
 285         struct zfcp_unit *unit;
 286
 287         read_lock_irq(&zfcp_data.config_lock);
 288         if (zfcp_get_unit_by_lun(port, fcp_lun)) {
 289                 read_unlock_irq(&zfcp_data.config_lock);
 290                 return ERR_PTR(-EINVAL);
 291         }
 292         read_unlock_irq(&zfcp_data.config_lock);
 293
 294         unit = kzalloc(sizeof(struct zfcp_unit), GFP_KERNEL);
 295         if (!unit)
 296                 return ERR_PTR(-ENOMEM);
 297
 298         atomic_set(&unit->refcount, 0);
 299         init_waitqueue_head(&unit->remove_wq);
 300         INIT_WORK(&unit->scsi_work, zfcp_scsi_scan);
 301
 302         unit->port = port;
 303         unit->fcp_lun = fcp_lun;
 304
 305         if (dev_set_name(&unit->sysfs_device, "0x%016llx",
 306                          (unsigned long long) fcp_lun)) {
 307                 kfree(unit);
 308                 return ERR_PTR(-ENOMEM);
 309         }
 310         unit->sysfs_device.parent = &port->sysfs_device;
 311         unit->sysfs_device.release = zfcp_sysfs_unit_release;
 312         dev_set_drvdata(&unit->sysfs_device, unit);
 313
 314         /* mark unit unusable as long as sysfs registration is not complete */
 315         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 316
 317         spin_lock_init(&unit->latencies.lock);
 318         unit->latencies.write.channel.min = 0xFFFFFFFF;
 319         unit->latencies.write.fabric.min = 0xFFFFFFFF;
 320         unit->latencies.read.channel.min = 0xFFFFFFFF;
 321         unit->latencies.read.fabric.min = 0xFFFFFFFF;
 322         unit->latencies.cmd.channel.min = 0xFFFFFFFF;
 323         unit->latencies.cmd.fabric.min = 0xFFFFFFFF;
 324
 325         if (device_register(&unit->sysfs_device)) {
 326                 put_device(&unit->sysfs_device);
 327                 return ERR_PTR(-EINVAL);
 328         }
 329
 330         if (sysfs_create_group(&unit->sysfs_device.kobj,
 331                                &zfcp_sysfs_unit_attrs)) {
 332                 device_unregister(&unit->sysfs_device);
 333                 return ERR_PTR(-EINVAL);
 334         }
 335
 336         zfcp_unit_get(unit);
 337
 338         write_lock_irq(&zfcp_data.config_lock);
 339         list_add_tail(&unit->list, &port->unit_list_head);
 340         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 341         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
 342
 343         write_unlock_irq(&zfcp_data.config_lock);
 344
 345         zfcp_port_get(port);
 346
 347         return unit;
 348 }
 349
 350 /**
 351  * zfcp_unit_dequeue - dequeue unit
 352  * @unit: pointer to zfcp_unit
 353  *
 354  * waits until all work is done on unit and removes it then from the unit->list
 355  * of the associated port.
 356  */
 357 void zfcp_unit_dequeue(struct zfcp_unit *unit)
 358 {
 359         wait_event(unit->remove_wq, atomic_read(&unit->refcount) == 0);
 360         write_lock_irq(&zfcp_data.config_lock);
 361         list_del(&unit->list);
 362         write_unlock_irq(&zfcp_data.config_lock);
 363         zfcp_port_put(unit->port);
 364         sysfs_remove_group(&unit->sysfs_device.kobj, &zfcp_sysfs_unit_attrs);
 365         device_unregister(&unit->sysfs_device);
 366 }
 367
 368 static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
 369 {
 370         /* must only be called with zfcp_data.config_mutex taken */
 371         adapter->pool.erp_req =
 372                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
 373         if (!adapter->pool.erp_req)
 374                 return -ENOMEM;
 375
 376         adapter->pool.gid_pn_req =
 377                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
 378         if (!adapter->pool.gid_pn_req)
 379                 return -ENOMEM;
 380
 381         adapter->pool.scsi_req =
 382                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
 383         if (!adapter->pool.scsi_req)
 384                 return -ENOMEM;
 385
 386         adapter->pool.scsi_abort =
 387                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
 388         if (!adapter->pool.scsi_abort)
 389                 return -ENOMEM;
 390
 391         adapter->pool.status_read_req =
 392                 mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM,
 393                                             sizeof(struct zfcp_fsf_req));
 394         if (!adapter->pool.status_read_req)
 395                 return -ENOMEM;
 396
 397         adapter->pool.qtcb_pool =
 398                 mempool_create_slab_pool(4, zfcp_data.qtcb_cache);
 399         if (!adapter->pool.qtcb_pool)
 400                 return -ENOMEM;
 401
 402         adapter->pool.status_read_data =
 403                 mempool_create_slab_pool(FSF_STATUS_READS_RECOM,
 404                                          zfcp_data.sr_buffer_cache);
 405         if (!adapter->pool.status_read_data)
 406                 return -ENOMEM;
 407
 408         adapter->pool.gid_pn_data =
 409                 mempool_create_slab_pool(1, zfcp_data.gid_pn_cache);
 410         if (!adapter->pool.gid_pn_data)
 411                 return -ENOMEM;
 412
 413         return 0;
 414 }
 415
 416 static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
 417 {
 418         /* zfcp_data.config_mutex must be held */
 419         if (adapter->pool.erp_req)
 420                 mempool_destroy(adapter->pool.erp_req);
 421         if (adapter->pool.scsi_req)
 422                 mempool_destroy(adapter->pool.scsi_req);
 423         if (adapter->pool.scsi_abort)
 424                 mempool_destroy(adapter->pool.scsi_abort);
 425         if (adapter->pool.qtcb_pool)
 426                 mempool_destroy(adapter->pool.qtcb_pool);
 427         if (adapter->pool.status_read_req)
 428                 mempool_destroy(adapter->pool.status_read_req);
 429         if (adapter->pool.status_read_data)
 430                 mempool_destroy(adapter->pool.status_read_data);
 431         if (adapter->pool.gid_pn_data)
 432                 mempool_destroy(adapter->pool.gid_pn_data);
 433 }
 434
 435 /**
 436  * zfcp_status_read_refill - refill the long running status_read_requests
 437  * @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled
 438  *
 439  * Returns: 0 on success, 1 otherwise
 440  *
 441  * if there are 16 or more status_read requests missing an adapter_reopen
 442  * is triggered
 443  */
 444 int zfcp_status_read_refill(struct zfcp_adapter *adapter)
 445 {
 446         while (atomic_read(&adapter->stat_miss) > 0)
 447                 if (zfcp_fsf_status_read(adapter->qdio)) {
 448                         if (atomic_read(&adapter->stat_miss) >= 16) {
 449                                 zfcp_erp_adapter_reopen(adapter, 0, "axsref1",
 450                                                         NULL);
 451                                 return 1;
 452                         }
 453                         break;
 454                 } else
 455                         atomic_dec(&adapter->stat_miss);
 456         return 0;
 457 }
 458
 459 static void _zfcp_status_read_scheduler(struct work_struct *work)
 460 {
 461         zfcp_status_read_refill(container_of(work, struct zfcp_adapter,
 462                                              stat_work));
 463 }
 464
 465 static void zfcp_print_sl(struct seq_file *m, struct service_level *sl)
 466 {
 467         struct zfcp_adapter *adapter =
 468                 container_of(sl, struct zfcp_adapter, service_level);
 469
 470         seq_printf(m, "zfcp: %s microcode level %x\n",
 471                    dev_name(&adapter->ccw_device->dev),
 472                    adapter->fsf_lic_version);
 473 }
 474
 475 static int zfcp_setup_adapter_work_queue(struct zfcp_adapter *adapter)
 476 {
 477         char name[TASK_COMM_LEN];
 478
 479         snprintf(name, sizeof(name), "zfcp_q_%s",
 480                  dev_name(&adapter->ccw_device->dev));
 481         adapter->work_queue = create_singlethread_workqueue(name);
 482
 483         if (adapter->work_queue)
 484                 return 0;
 485         return -ENOMEM;
 486 }
 487
 488 static void zfcp_destroy_adapter_work_queue(struct zfcp_adapter *adapter)
 489 {
 490         if (adapter->work_queue)
 491                 destroy_workqueue(adapter->work_queue);
 492         adapter->work_queue = NULL;
 493
 494 }
 495
 496 /**
 497  * zfcp_adapter_enqueue - enqueue a new adapter to the list
 498  * @ccw_device: pointer to the struct cc_device
 499  *
 500  * Returns:     0             if a new adapter was successfully enqueued
 501  *              -ENOMEM       if alloc failed
 502  * Enqueues an adapter at the end of the adapter list in the driver data.
 503  * All adapter internal structures are set up.
 504  * Proc-fs entries are also created.
 505  * locks: config_mutex must be held to serialize changes to the adapter list
 506  */
 507 int zfcp_adapter_enqueue(struct ccw_device *ccw_device)
 508 {
 509         struct zfcp_adapter *adapter;
 510
 511         /*
 512          * Note: It is safe to release the list_lock, as any list changes
 513          * are protected by the config_mutex, which must be held to get here
 514          */
 515
 516         adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL);
 517         if (!adapter)
 518                 return -ENOMEM;
 519
 520         ccw_device->handler = NULL;
 521         adapter->ccw_device = ccw_device;
 522         atomic_set(&adapter->refcount, 0);
 523
 524         if (zfcp_qdio_setup(adapter))
 525                 goto qdio_failed;
 526
 527         if (zfcp_allocate_low_mem_buffers(adapter))
 528                 goto low_mem_buffers_failed;
 529
 530         if (zfcp_reqlist_alloc(adapter))
 531                 goto low_mem_buffers_failed;
 532
 533         if (zfcp_dbf_adapter_register(adapter))
 534                 goto debug_register_failed;
 535
 536         if (zfcp_setup_adapter_work_queue(adapter))
 537                 goto work_queue_failed;
 538
 539         if (zfcp_fc_gs_setup(adapter))
 540                 goto generic_services_failed;
 541
 542         init_waitqueue_head(&adapter->remove_wq);
 543         init_waitqueue_head(&adapter->erp_ready_wq);
 544         init_waitqueue_head(&adapter->erp_done_wqh);
 545
 546         INIT_LIST_HEAD(&adapter->port_list_head);
 547         INIT_LIST_HEAD(&adapter->erp_ready_head);
 548         INIT_LIST_HEAD(&adapter->erp_running_head);
 549
 550         spin_lock_init(&adapter->req_list_lock);
 551
 552         rwlock_init(&adapter->erp_lock);
 553         rwlock_init(&adapter->abort_lock);
 554
 555         if (zfcp_erp_thread_setup(adapter))
 556                 goto erp_thread_failed;
 557
 558         INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
 559         INIT_WORK(&adapter->scan_work, _zfcp_fc_scan_ports_later);
 560
 561         adapter->service_level.seq_print = zfcp_print_sl;
 562
 563         /* mark adapter unusable as long as sysfs registration is not complete */
 564         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
 565
 566         dev_set_drvdata(&ccw_device->dev, adapter);
 567
 568         if (sysfs_create_group(&ccw_device->dev.kobj,
 569                                &zfcp_sysfs_adapter_attrs))
 570                 goto sysfs_failed;
 571
 572         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
 573
 574         if (!zfcp_adapter_scsi_register(adapter))
 575                 return 0;
 576
 577 sysfs_failed:
 578         zfcp_erp_thread_kill(adapter);
 579 erp_thread_failed:
 580         zfcp_fc_gs_destroy(adapter);
 581 generic_services_failed:
 582         zfcp_destroy_adapter_work_queue(adapter);
 583 work_queue_failed:
 584         zfcp_dbf_adapter_unregister(adapter->dbf);
 585 debug_register_failed:
 586         dev_set_drvdata(&ccw_device->dev, NULL);
 587         kfree(adapter->req_list);
 588 low_mem_buffers_failed:
 589         zfcp_free_low_mem_buffers(adapter);
 590 qdio_failed:
 591         zfcp_qdio_destroy(adapter->qdio);
 592         kfree(adapter);
 593         return -ENOMEM;
 594 }
 595
 596 /**
 597  * zfcp_adapter_dequeue - remove the adapter from the resource list
 598  * @adapter: pointer to struct zfcp_adapter which should be removed
 599  * locks:       adapter list write lock is assumed to be held by caller
 600  */
 601 void zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
 602 {
 603         int retval = 0;
 604         unsigned long flags;
 605
 606         cancel_work_sync(&adapter->stat_work);
 607         zfcp_fc_wka_ports_force_offline(adapter->gs);
 608         sysfs_remove_group(&adapter->ccw_device->dev.kobj,
 609                            &zfcp_sysfs_adapter_attrs);
 610         dev_set_drvdata(&adapter->ccw_device->dev, NULL);
 611         /* sanity check: no pending FSF requests */
 612         spin_lock_irqsave(&adapter->req_list_lock, flags);
 613         retval = zfcp_reqlist_isempty(adapter);
 614         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 615         if (!retval)
 616                 return;
 617
 618         zfcp_fc_gs_destroy(adapter);
 619         zfcp_erp_thread_kill(adapter);
 620         zfcp_destroy_adapter_work_queue(adapter);
 621         zfcp_dbf_adapter_unregister(adapter->dbf);
 622         zfcp_free_low_mem_buffers(adapter);
 623         zfcp_qdio_destroy(adapter->qdio);
 624         kfree(adapter->req_list);
 625         kfree(adapter->fc_stats);
 626         kfree(adapter->stats_reset_data);
 627         kfree(adapter);
 628 }
 629
 630 static void zfcp_sysfs_port_release(struct device *dev)
 631 {
 632         kfree(container_of(dev, struct zfcp_port, sysfs_device));
 633 }
 634
 635 /**
 636  * zfcp_port_enqueue - enqueue port to port list of adapter
 637  * @adapter: adapter where remote port is added
 638  * @wwpn: WWPN of the remote port to be enqueued
 639  * @status: initial status for the port
 640  * @d_id: destination id of the remote port to be enqueued
 641  * Returns: pointer to enqueued port on success, ERR_PTR on error
 642  * Locks: config_mutex must be held to serialize changes to the port list
 643  *
 644  * All port internal structures are set up and the sysfs entry is generated.
 645  * d_id is used to enqueue ports with a well known address like the Directory
 646  * Service for nameserver lookup.
 647  */
 648 struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn,
 649                                      u32 status, u32 d_id)
 650 {
 651         struct zfcp_port *port;
 652
 653         read_lock_irq(&zfcp_data.config_lock);
 654         if (zfcp_get_port_by_wwpn(adapter, wwpn)) {
 655                 read_unlock_irq(&zfcp_data.config_lock);
 656                 return ERR_PTR(-EINVAL);
 657         }
 658         read_unlock_irq(&zfcp_data.config_lock);
 659
 660         port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL);
 661         if (!port)
 662                 return ERR_PTR(-ENOMEM);
 663
 664         init_waitqueue_head(&port->remove_wq);
 665         INIT_LIST_HEAD(&port->unit_list_head);
 666         INIT_WORK(&port->gid_pn_work, zfcp_fc_port_did_lookup);
 667         INIT_WORK(&port->test_link_work, zfcp_fc_link_test_work);
 668         INIT_WORK(&port->rport_work, zfcp_scsi_rport_work);
 669
 670         port->adapter = adapter;
 671         port->d_id = d_id;
 672         port->wwpn = wwpn;
 673         port->rport_task = RPORT_NONE;
 674
 675         /* mark port unusable as long as sysfs registration is not complete */
 676         atomic_set_mask(status | ZFCP_STATUS_COMMON_REMOVE, &port->status);
 677         atomic_set(&port->refcount, 0);
 678
 679         if (dev_set_name(&port->sysfs_device, "0x%016llx",
 680                          (unsigned long long)wwpn)) {
 681                 kfree(port);
 682                 return ERR_PTR(-ENOMEM);
 683         }
 684         port->sysfs_device.parent = &adapter->ccw_device->dev;
 685         port->sysfs_device.release = zfcp_sysfs_port_release;
 686         dev_set_drvdata(&port->sysfs_device, port);
 687
 688         if (device_register(&port->sysfs_device)) {
 689                 put_device(&port->sysfs_device);
 690                 return ERR_PTR(-EINVAL);
 691         }
 692
 693         if (sysfs_create_group(&port->sysfs_device.kobj,
 694                                &zfcp_sysfs_port_attrs)) {
 695                 device_unregister(&port->sysfs_device);
 696                 return ERR_PTR(-EINVAL);
 697         }
 698
 699         zfcp_port_get(port);
 700
 701         write_lock_irq(&zfcp_data.config_lock);
 702         list_add_tail(&port->list, &adapter->port_list_head);
 703         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
 704         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
 705
 706         write_unlock_irq(&zfcp_data.config_lock);
 707
 708         zfcp_adapter_get(adapter);
 709         return port;
 710 }
 711
 712 /**
 713  * zfcp_port_dequeue - dequeues a port from the port list of the adapter
 714  * @port: pointer to struct zfcp_port which should be removed
 715  */
 716 void zfcp_port_dequeue(struct zfcp_port *port)
 717 {
 718         write_lock_irq(&zfcp_data.config_lock);
 719         list_del(&port->list);
 720         write_unlock_irq(&zfcp_data.config_lock);
 721         wait_event(port->remove_wq, atomic_read(&port->refcount) == 0);
 722         cancel_work_sync(&port->rport_work); /* usually not necessary */
 723         zfcp_adapter_put(port->adapter);
 724         sysfs_remove_group(&port->sysfs_device.kobj, &zfcp_sysfs_port_attrs);
 725         device_unregister(&port->sysfs_device);
 726 }
 727
 728 /**
 729  * zfcp_sg_free_table - free memory used by scatterlists
 730  * @sg: pointer to scatterlist
 731  * @count: number of scatterlist which are to be free'ed
 732  * the scatterlist are expected to reference pages always
 733  */
 734 void zfcp_sg_free_table(struct scatterlist *sg, int count)
 735 {
 736         int i;
 737
 738         for (i = 0; i < count; i++, sg++)
 739                 if (sg)
 740                         free_page((unsigned long) sg_virt(sg));
 741                 else
 742                         break;
 743 }
 744
 745 /**
 746  * zfcp_sg_setup_table - init scatterlist and allocate, assign buffers
 747  * @sg: pointer to struct scatterlist
 748  * @count: number of scatterlists which should be assigned with buffers
 749  * of size page
 750  *
 751  * Returns: 0 on success, -ENOMEM otherwise
 752  */
 753 int zfcp_sg_setup_table(struct scatterlist *sg, int count)
 754 {
 755         void *addr;
 756         int i;
 757
 758         sg_init_table(sg, count);
 759         for (i = 0; i < count; i++, sg++) {
 760                 addr = (void *) get_zeroed_page(GFP_KERNEL);
 761                 if (!addr) {
 762                         zfcp_sg_free_table(sg, i);
 763                         return -ENOMEM;
 764                 }
 765                 sg_set_buf(sg, addr, PAGE_SIZE);
 766         }
 767         return 0;
 768 }