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         read_lock_irq(&zfcp_data.config_lock);
 278         if (zfcp_get_unit_by_lun(port, fcp_lun)) {
 279                 read_unlock_irq(&zfcp_data.config_lock);
 280                 return ERR_PTR(-EINVAL);
 281         }
 282         read_unlock_irq(&zfcp_data.config_lock);
 283
 284         unit = kzalloc(sizeof(struct zfcp_unit), GFP_KERNEL);
 285         if (!unit)
 286                 return ERR_PTR(-ENOMEM);
 287
 288         atomic_set(&unit->refcount, 0);
 289         init_waitqueue_head(&unit->remove_wq);
 290         INIT_WORK(&unit->scsi_work, zfcp_scsi_scan);
 291
 292         unit->port = port;
 293         unit->fcp_lun = fcp_lun;
 294
 295         if (dev_set_name(&unit->sysfs_device, "0x%016llx",
 296                          (unsigned long long) fcp_lun)) {
 297                 kfree(unit);
 298                 return ERR_PTR(-ENOMEM);
 299         }
 300         unit->sysfs_device.parent = &port->sysfs_device;
 301         unit->sysfs_device.release = zfcp_sysfs_unit_release;
 302         dev_set_drvdata(&unit->sysfs_device, unit);
 303
 304         /* mark unit unusable as long as sysfs registration is not complete */
 305         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 306
 307         spin_lock_init(&unit->latencies.lock);
 308         unit->latencies.write.channel.min = 0xFFFFFFFF;
 309         unit->latencies.write.fabric.min = 0xFFFFFFFF;
 310         unit->latencies.read.channel.min = 0xFFFFFFFF;
 311         unit->latencies.read.fabric.min = 0xFFFFFFFF;
 312         unit->latencies.cmd.channel.min = 0xFFFFFFFF;
 313         unit->latencies.cmd.fabric.min = 0xFFFFFFFF;
 314
 315         if (device_register(&unit->sysfs_device)) {
 316                 put_device(&unit->sysfs_device);
 317                 return ERR_PTR(-EINVAL);
 318         }
 319
 320         if (sysfs_create_group(&unit->sysfs_device.kobj,
 321                                &zfcp_sysfs_unit_attrs)) {
 322                 device_unregister(&unit->sysfs_device);
 323                 return ERR_PTR(-EINVAL);
 324         }
 325
 326         zfcp_unit_get(unit);
 327
 328         write_lock_irq(&zfcp_data.config_lock);
 329         list_add_tail(&unit->list, &port->unit_list_head);
 330         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 331         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
 332
 333         write_unlock_irq(&zfcp_data.config_lock);
 334
 335         zfcp_port_get(port);
 336
 337         return unit;
 338 }
 339
 340 /**
 341  * zfcp_unit_dequeue - dequeue unit
 342  * @unit: pointer to zfcp_unit
 343  *
 344  * waits until all work is done on unit and removes it then from the unit->list
 345  * of the associated port.
 346  */
 347 void zfcp_unit_dequeue(struct zfcp_unit *unit)
 348 {
 349         wait_event(unit->remove_wq, atomic_read(&unit->refcount) == 0);
 350         write_lock_irq(&zfcp_data.config_lock);
 351         list_del(&unit->list);
 352         write_unlock_irq(&zfcp_data.config_lock);
 353         zfcp_port_put(unit->port);
 354         sysfs_remove_group(&unit->sysfs_device.kobj, &zfcp_sysfs_unit_attrs);
 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_mutex taken */
 361         adapter->pool.erp_req =
 362                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
 363         if (!adapter->pool.erp_req)
 364                 return -ENOMEM;
 365
 366         adapter->pool.gid_pn_req =
 367                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
 368         if (!adapter->pool.gid_pn_req)
 369                 return -ENOMEM;
 370
 371         adapter->pool.scsi_req =
 372                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
 373         if (!adapter->pool.scsi_req)
 374                 return -ENOMEM;
 375
 376         adapter->pool.scsi_abort =
 377                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
 378         if (!adapter->pool.scsi_abort)
 379                 return -ENOMEM;
 380
 381         adapter->pool.status_read_req =
 382                 mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM,
 383                                             sizeof(struct zfcp_fsf_req));
 384         if (!adapter->pool.status_read_req)
 385                 return -ENOMEM;
 386
 387         adapter->pool.qtcb_pool =
 388                 mempool_create_slab_pool(4, zfcp_data.qtcb_cache);
 389         if (!adapter->pool.qtcb_pool)
 390                 return -ENOMEM;
 391
 392         adapter->pool.status_read_data =
 393                 mempool_create_slab_pool(FSF_STATUS_READS_RECOM,
 394                                          zfcp_data.sr_buffer_cache);
 395         if (!adapter->pool.status_read_data)
 396                 return -ENOMEM;
 397
 398         adapter->pool.gid_pn_data =
 399                 mempool_create_slab_pool(1, zfcp_data.gid_pn_cache);
 400         if (!adapter->pool.gid_pn_data)
 401                 return -ENOMEM;
 402
 403         return 0;
 404 }
 405
 406 static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
 407 {
 408         /* zfcp_data.config_mutex must be held */
 409         if (adapter->pool.erp_req)
 410                 mempool_destroy(adapter->pool.erp_req);
 411         if (adapter->pool.scsi_req)
 412                 mempool_destroy(adapter->pool.scsi_req);
 413         if (adapter->pool.scsi_abort)
 414                 mempool_destroy(adapter->pool.scsi_abort);
 415         if (adapter->pool.qtcb_pool)
 416                 mempool_destroy(adapter->pool.qtcb_pool);
 417         if (adapter->pool.status_read_req)
 418                 mempool_destroy(adapter->pool.status_read_req);
 419         if (adapter->pool.status_read_data)
 420                 mempool_destroy(adapter->pool.status_read_data);
 421         if (adapter->pool.gid_pn_data)
 422                 mempool_destroy(adapter->pool.gid_pn_data);
 423 }
 424
 425 /**
 426  * zfcp_status_read_refill - refill the long running status_read_requests
 427  * @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled
 428  *
 429  * Returns: 0 on success, 1 otherwise
 430  *
 431  * if there are 16 or more status_read requests missing an adapter_reopen
 432  * is triggered
 433  */
 434 int zfcp_status_read_refill(struct zfcp_adapter *adapter)
 435 {
 436         while (atomic_read(&adapter->stat_miss) > 0)
 437                 if (zfcp_fsf_status_read(adapter->qdio)) {
 438                         if (atomic_read(&adapter->stat_miss) >= 16) {
 439                                 zfcp_erp_adapter_reopen(adapter, 0, "axsref1",
 440                                                         NULL);
 441                                 return 1;
 442                         }
 443                         break;
 444                 } else
 445                         atomic_dec(&adapter->stat_miss);
 446         return 0;
 447 }
 448
 449 static void _zfcp_status_read_scheduler(struct work_struct *work)
 450 {
 451         zfcp_status_read_refill(container_of(work, struct zfcp_adapter,
 452                                              stat_work));
 453 }
 454
 455 static void zfcp_print_sl(struct seq_file *m, struct service_level *sl)
 456 {
 457         struct zfcp_adapter *adapter =
 458                 container_of(sl, struct zfcp_adapter, service_level);
 459
 460         seq_printf(m, "zfcp: %s microcode level %x\n",
 461                    dev_name(&adapter->ccw_device->dev),
 462                    adapter->fsf_lic_version);
 463 }
 464
 465 static int zfcp_setup_adapter_work_queue(struct zfcp_adapter *adapter)
 466 {
 467         char name[TASK_COMM_LEN];
 468
 469         snprintf(name, sizeof(name), "zfcp_q_%s",
 470                  dev_name(&adapter->ccw_device->dev));
 471         adapter->work_queue = create_singlethread_workqueue(name);
 472
 473         if (adapter->work_queue)
 474                 return 0;
 475         return -ENOMEM;
 476 }
 477
 478 static void zfcp_destroy_adapter_work_queue(struct zfcp_adapter *adapter)
 479 {
 480         if (adapter->work_queue)
 481                 destroy_workqueue(adapter->work_queue);
 482         adapter->work_queue = NULL;
 483
 484 }
 485
 486 /**
 487  * zfcp_adapter_enqueue - enqueue a new adapter to the list
 488  * @ccw_device: pointer to the struct cc_device
 489  *
 490  * Returns:     0             if a new adapter was successfully enqueued
 491  *              -ENOMEM       if alloc failed
 492  * Enqueues an adapter at the end of the adapter list in the driver data.
 493  * All adapter internal structures are set up.
 494  * Proc-fs entries are also created.
 495  * locks: config_mutex must be held to serialize changes to the adapter list
 496  */
 497 int zfcp_adapter_enqueue(struct ccw_device *ccw_device)
 498 {
 499         struct zfcp_adapter *adapter;
 500
 501         /*
 502          * Note: It is safe to release the list_lock, as any list changes
 503          * are protected by the config_mutex, which must be held to get here
 504          */
 505
 506         adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL);
 507         if (!adapter)
 508                 return -ENOMEM;
 509
 510         ccw_device->handler = NULL;
 511         adapter->ccw_device = ccw_device;
 512         atomic_set(&adapter->refcount, 0);
 513
 514         if (zfcp_qdio_setup(adapter))
 515                 goto qdio_failed;
 516
 517         if (zfcp_allocate_low_mem_buffers(adapter))
 518                 goto low_mem_buffers_failed;
 519
 520         if (zfcp_reqlist_alloc(adapter))
 521                 goto low_mem_buffers_failed;
 522
 523         if (zfcp_dbf_adapter_register(adapter))
 524                 goto debug_register_failed;
 525
 526         if (zfcp_setup_adapter_work_queue(adapter))
 527                 goto work_queue_failed;
 528
 529         if (zfcp_fc_gs_setup(adapter))
 530                 goto generic_services_failed;
 531
 532         init_waitqueue_head(&adapter->remove_wq);
 533         init_waitqueue_head(&adapter->erp_ready_wq);
 534         init_waitqueue_head(&adapter->erp_done_wqh);
 535
 536         INIT_LIST_HEAD(&adapter->port_list_head);
 537         INIT_LIST_HEAD(&adapter->erp_ready_head);
 538         INIT_LIST_HEAD(&adapter->erp_running_head);
 539
 540         spin_lock_init(&adapter->req_list_lock);
 541
 542         rwlock_init(&adapter->erp_lock);
 543         rwlock_init(&adapter->abort_lock);
 544
 545         if (zfcp_erp_thread_setup(adapter))
 546                 goto erp_thread_failed;
 547
 548         INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
 549         INIT_WORK(&adapter->scan_work, _zfcp_fc_scan_ports_later);
 550
 551         adapter->service_level.seq_print = zfcp_print_sl;
 552
 553         /* mark adapter unusable as long as sysfs registration is not complete */
 554         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
 555
 556         dev_set_drvdata(&ccw_device->dev, adapter);
 557
 558         if (sysfs_create_group(&ccw_device->dev.kobj,
 559                                &zfcp_sysfs_adapter_attrs))
 560                 goto sysfs_failed;
 561
 562         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
 563
 564         if (!zfcp_adapter_scsi_register(adapter))
 565                 return 0;
 566
 567 sysfs_failed:
 568         zfcp_erp_thread_kill(adapter);
 569 erp_thread_failed:
 570         zfcp_fc_gs_destroy(adapter);
 571 generic_services_failed:
 572         zfcp_destroy_adapter_work_queue(adapter);
 573 work_queue_failed:
 574         zfcp_dbf_adapter_unregister(adapter->dbf);
 575 debug_register_failed:
 576         dev_set_drvdata(&ccw_device->dev, NULL);
 577         kfree(adapter->req_list);
 578 low_mem_buffers_failed:
 579         zfcp_free_low_mem_buffers(adapter);
 580 qdio_failed:
 581         zfcp_qdio_destroy(adapter->qdio);
 582         kfree(adapter);
 583         return -ENOMEM;
 584 }
 585
 586 /**
 587  * zfcp_adapter_dequeue - remove the adapter from the resource list
 588  * @adapter: pointer to struct zfcp_adapter which should be removed
 589  * locks:       adapter list write lock is assumed to be held by caller
 590  */
 591 void zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
 592 {
 593         int retval = 0;
 594         unsigned long flags;
 595
 596         cancel_work_sync(&adapter->scan_work);
 597         cancel_work_sync(&adapter->stat_work);
 598         zfcp_fc_wka_ports_force_offline(adapter->gs);
 599         zfcp_adapter_scsi_unregister(adapter);
 600         sysfs_remove_group(&adapter->ccw_device->dev.kobj,
 601                            &zfcp_sysfs_adapter_attrs);
 602         dev_set_drvdata(&adapter->ccw_device->dev, NULL);
 603         /* sanity check: no pending FSF requests */
 604         spin_lock_irqsave(&adapter->req_list_lock, flags);
 605         retval = zfcp_reqlist_isempty(adapter);
 606         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 607         if (!retval)
 608                 return;
 609
 610         zfcp_fc_gs_destroy(adapter);
 611         zfcp_erp_thread_kill(adapter);
 612         zfcp_destroy_adapter_work_queue(adapter);
 613         zfcp_dbf_adapter_unregister(adapter->dbf);
 614         zfcp_free_low_mem_buffers(adapter);
 615         zfcp_qdio_destroy(adapter->qdio);
 616         kfree(adapter->req_list);
 617         kfree(adapter->fc_stats);
 618         kfree(adapter->stats_reset_data);
 619         kfree(adapter);
 620 }
 621
 622 static void zfcp_sysfs_port_release(struct device *dev)
 623 {
 624         kfree(container_of(dev, struct zfcp_port, sysfs_device));
 625 }
 626
 627 /**
 628  * zfcp_port_enqueue - enqueue port to port list of adapter
 629  * @adapter: adapter where remote port is added
 630  * @wwpn: WWPN of the remote port to be enqueued
 631  * @status: initial status for the port
 632  * @d_id: destination id of the remote port to be enqueued
 633  * Returns: pointer to enqueued port on success, ERR_PTR on error
 634  * Locks: config_mutex must be held to serialize changes to the port list
 635  *
 636  * All port internal structures are set up and the sysfs entry is generated.
 637  * d_id is used to enqueue ports with a well known address like the Directory
 638  * Service for nameserver lookup.
 639  */
 640 struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn,
 641                                      u32 status, u32 d_id)
 642 {
 643         struct zfcp_port *port;
 644
 645         read_lock_irq(&zfcp_data.config_lock);
 646         if (zfcp_get_port_by_wwpn(adapter, wwpn)) {
 647                 read_unlock_irq(&zfcp_data.config_lock);
 648                 return ERR_PTR(-EINVAL);
 649         }
 650         read_unlock_irq(&zfcp_data.config_lock);
 651
 652         port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL);
 653         if (!port)
 654                 return ERR_PTR(-ENOMEM);
 655
 656         init_waitqueue_head(&port->remove_wq);
 657         INIT_LIST_HEAD(&port->unit_list_head);
 658         INIT_WORK(&port->gid_pn_work, zfcp_fc_port_did_lookup);
 659         INIT_WORK(&port->test_link_work, zfcp_fc_link_test_work);
 660         INIT_WORK(&port->rport_work, zfcp_scsi_rport_work);
 661
 662         port->adapter = adapter;
 663         port->d_id = d_id;
 664         port->wwpn = wwpn;
 665         port->rport_task = RPORT_NONE;
 666
 667         /* mark port unusable as long as sysfs registration is not complete */
 668         atomic_set_mask(status | ZFCP_STATUS_COMMON_REMOVE, &port->status);
 669         atomic_set(&port->refcount, 0);
 670
 671         if (dev_set_name(&port->sysfs_device, "0x%016llx",
 672                          (unsigned long long)wwpn)) {
 673                 kfree(port);
 674                 return ERR_PTR(-ENOMEM);
 675         }
 676         port->sysfs_device.parent = &adapter->ccw_device->dev;
 677         port->sysfs_device.release = zfcp_sysfs_port_release;
 678         dev_set_drvdata(&port->sysfs_device, port);
 679
 680         if (device_register(&port->sysfs_device)) {
 681                 put_device(&port->sysfs_device);
 682                 return ERR_PTR(-EINVAL);
 683         }
 684
 685         if (sysfs_create_group(&port->sysfs_device.kobj,
 686                                &zfcp_sysfs_port_attrs)) {
 687                 device_unregister(&port->sysfs_device);
 688                 return ERR_PTR(-EINVAL);
 689         }
 690
 691         zfcp_port_get(port);
 692
 693         write_lock_irq(&zfcp_data.config_lock);
 694         list_add_tail(&port->list, &adapter->port_list_head);
 695         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
 696         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
 697
 698         write_unlock_irq(&zfcp_data.config_lock);
 699
 700         zfcp_adapter_get(adapter);
 701         return port;
 702 }
 703
 704 /**
 705  * zfcp_port_dequeue - dequeues a port from the port list of the adapter
 706  * @port: pointer to struct zfcp_port which should be removed
 707  */
 708 void zfcp_port_dequeue(struct zfcp_port *port)
 709 {
 710         write_lock_irq(&zfcp_data.config_lock);
 711         list_del(&port->list);
 712         write_unlock_irq(&zfcp_data.config_lock);
 713         wait_event(port->remove_wq, atomic_read(&port->refcount) == 0);
 714         cancel_work_sync(&port->rport_work); /* usually not necessary */
 715         zfcp_adapter_put(port->adapter);
 716         sysfs_remove_group(&port->sysfs_device.kobj, &zfcp_sysfs_port_attrs);
 717         device_unregister(&port->sysfs_device);
 718 }
 719
 720 /**
 721  * zfcp_sg_free_table - free memory used by scatterlists
 722  * @sg: pointer to scatterlist
 723  * @count: number of scatterlist which are to be free'ed
 724  * the scatterlist are expected to reference pages always
 725  */
 726 void zfcp_sg_free_table(struct scatterlist *sg, int count)
 727 {
 728         int i;
 729
 730         for (i = 0; i < count; i++, sg++)
 731                 if (sg)
 732                         free_page((unsigned long) sg_virt(sg));
 733                 else
 734                         break;
 735 }
 736
 737 /**
 738  * zfcp_sg_setup_table - init scatterlist and allocate, assign buffers
 739  * @sg: pointer to struct scatterlist
 740  * @count: number of scatterlists which should be assigned with buffers
 741  * of size page
 742  *
 743  * Returns: 0 on success, -ENOMEM otherwise
 744  */
 745 int zfcp_sg_setup_table(struct scatterlist *sg, int count)
 746 {
 747         void *addr;
 748         int i;
 749
 750         sg_init_table(sg, count);
 751         for (i = 0; i < count; i++, sg++) {
 752                 addr = (void *) get_zeroed_page(GFP_KERNEL);
 753                 if (!addr) {
 754                         zfcp_sg_free_table(sg, i);
 755                         return -ENOMEM;
 756                 }
 757                 sg_set_buf(sg, addr, PAGE_SIZE);
 758         }
 759         return 0;
 760 }