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: %s is not a valid SCSI device\n", devstr);
 104         return 0;
 105 }
 106
 107 static struct zfcp_adapter *zfcp_get_adapter_by_busid(char *bus_id)
 108 {
 109         struct zfcp_adapter *adapter;
 110
 111         list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list)
 112                 if ((strncmp(bus_id, adapter->ccw_device->dev.bus_id,
 113                              BUS_ID_SIZE) == 0) &&
 114                     !(atomic_read(&adapter->status) &
 115                       ZFCP_STATUS_COMMON_REMOVE))
 116                     return adapter;
 117         return NULL;
 118 }
 119
 120 static void __init zfcp_init_device_configure(void)
 121 {
 122         struct zfcp_adapter *adapter;
 123         struct zfcp_port *port;
 124         struct zfcp_unit *unit;
 125
 126         down(&zfcp_data.config_sema);
 127         read_lock_irq(&zfcp_data.config_lock);
 128         adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
 129         if (adapter)
 130                 zfcp_adapter_get(adapter);
 131         read_unlock_irq(&zfcp_data.config_lock);
 132
 133         if (!adapter)
 134                 goto out_adapter;
 135         port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
 136         if (IS_ERR(port))
 137                 goto out_port;
 138         unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
 139         if (IS_ERR(unit))
 140                 goto out_unit;
 141         up(&zfcp_data.config_sema);
 142         ccw_device_set_online(adapter->ccw_device);
 143         zfcp_erp_wait(adapter);
 144         down(&zfcp_data.config_sema);
 145         zfcp_unit_put(unit);
 146 out_unit:
 147         zfcp_port_put(port);
 148 out_port:
 149         zfcp_adapter_put(adapter);
 150 out_adapter:
 151         up(&zfcp_data.config_sema);
 152         return;
 153 }
 154
 155 static struct kmem_cache *zfcp_cache_create(int size, char *name)
 156 {
 157         int align = 1;
 158         while ((size - align) > 0)
 159                 align <<= 1;
 160         return kmem_cache_create(name , size, align, 0, NULL);
 161 }
 162
 163 static int __init zfcp_module_init(void)
 164 {
 165         int retval = -ENOMEM;
 166
 167         zfcp_data.fsf_req_qtcb_cache = zfcp_cache_create(
 168                         sizeof(struct zfcp_fsf_req_qtcb), "zfcp_fsf");
 169         if (!zfcp_data.fsf_req_qtcb_cache)
 170                 goto out;
 171
 172         zfcp_data.sr_buffer_cache = zfcp_cache_create(
 173                         sizeof(struct fsf_status_read_buffer), "zfcp_sr");
 174         if (!zfcp_data.sr_buffer_cache)
 175                 goto out_sr_cache;
 176
 177         zfcp_data.gid_pn_cache = zfcp_cache_create(
 178                         sizeof(struct zfcp_gid_pn_data), "zfcp_gid");
 179         if (!zfcp_data.gid_pn_cache)
 180                 goto out_gid_cache;
 181
 182         INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
 183         INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
 184
 185         sema_init(&zfcp_data.config_sema, 1);
 186         rwlock_init(&zfcp_data.config_lock);
 187
 188         zfcp_data.scsi_transport_template =
 189                 fc_attach_transport(&zfcp_transport_functions);
 190         if (!zfcp_data.scsi_transport_template)
 191                 goto out_transport;
 192
 193         retval = misc_register(&zfcp_cfdc_misc);
 194         if (retval) {
 195                 pr_err("zfcp: Registering the misc device zfcp_cfdc failed\n");
 196                 goto out_misc;
 197         }
 198
 199         retval = zfcp_ccw_register();
 200         if (retval) {
 201                 pr_err("zfcp: The zfcp device driver could not register with "
 202                        "the common I/O layer\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 static void zfcp_sysfs_unit_release(struct device *dev)
 266 {
 267         kfree(container_of(dev, struct zfcp_unit, sysfs_device));
 268 }
 269
 270 /**
 271  * zfcp_unit_enqueue - enqueue unit to unit list of a port.
 272  * @port: pointer to port where unit is added
 273  * @fcp_lun: FCP LUN of unit to be enqueued
 274  * Returns: pointer to enqueued unit on success, ERR_PTR on error
 275  * Locks: config_sema must be held to serialize changes to the unit list
 276  *
 277  * Sets up some unit internal structures and creates sysfs entry.
 278  */
 279 struct zfcp_unit *zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
 280 {
 281         struct zfcp_unit *unit;
 282
 283         unit = kzalloc(sizeof(struct zfcp_unit), GFP_KERNEL);
 284         if (!unit)
 285                 return ERR_PTR(-ENOMEM);
 286
 287         atomic_set(&unit->refcount, 0);
 288         init_waitqueue_head(&unit->remove_wq);
 289
 290         unit->port = port;
 291         unit->fcp_lun = fcp_lun;
 292
 293         snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
 294         unit->sysfs_device.parent = &port->sysfs_device;
 295         unit->sysfs_device.release = zfcp_sysfs_unit_release;
 296         dev_set_drvdata(&unit->sysfs_device, unit);
 297
 298         /* mark unit unusable as long as sysfs registration is not complete */
 299         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 300
 301         spin_lock_init(&unit->latencies.lock);
 302         unit->latencies.write.channel.min = 0xFFFFFFFF;
 303         unit->latencies.write.fabric.min = 0xFFFFFFFF;
 304         unit->latencies.read.channel.min = 0xFFFFFFFF;
 305         unit->latencies.read.fabric.min = 0xFFFFFFFF;
 306         unit->latencies.cmd.channel.min = 0xFFFFFFFF;
 307         unit->latencies.cmd.fabric.min = 0xFFFFFFFF;
 308
 309         read_lock_irq(&zfcp_data.config_lock);
 310         if (zfcp_get_unit_by_lun(port, fcp_lun)) {
 311                 read_unlock_irq(&zfcp_data.config_lock);
 312                 goto err_out_free;
 313         }
 314         read_unlock_irq(&zfcp_data.config_lock);
 315
 316         if (device_register(&unit->sysfs_device))
 317                 goto err_out_free;
 318
 319         if (sysfs_create_group(&unit->sysfs_device.kobj,
 320                                &zfcp_sysfs_unit_attrs)) {
 321                 device_unregister(&unit->sysfs_device);
 322                 return ERR_PTR(-EIO);
 323         }
 324
 325         zfcp_unit_get(unit);
 326         unit->scsi_lun = scsilun_to_int((struct scsi_lun *)&unit->fcp_lun);
 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         port->units++;
 336         zfcp_port_get(port);
 337
 338         return unit;
 339
 340 err_out_free:
 341         kfree(unit);
 342         return ERR_PTR(-EINVAL);
 343 }
 344
 345 /**
 346  * zfcp_unit_dequeue - dequeue unit
 347  * @unit: pointer to zfcp_unit
 348  *
 349  * waits until all work is done on unit and removes it then from the unit->list
 350  * of the associated port.
 351  */
 352 void zfcp_unit_dequeue(struct zfcp_unit *unit)
 353 {
 354         wait_event(unit->remove_wq, atomic_read(&unit->refcount) == 0);
 355         write_lock_irq(&zfcp_data.config_lock);
 356         list_del(&unit->list);
 357         write_unlock_irq(&zfcp_data.config_lock);
 358         unit->port->units--;
 359         zfcp_port_put(unit->port);
 360         sysfs_remove_group(&unit->sysfs_device.kobj, &zfcp_sysfs_unit_attrs);
 361         device_unregister(&unit->sysfs_device);
 362 }
 363
 364 static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
 365 {
 366         /* must only be called with zfcp_data.config_sema taken */
 367         adapter->pool.fsf_req_erp =
 368                 mempool_create_slab_pool(1, zfcp_data.fsf_req_qtcb_cache);
 369         if (!adapter->pool.fsf_req_erp)
 370                 return -ENOMEM;
 371
 372         adapter->pool.fsf_req_scsi =
 373                 mempool_create_slab_pool(1, zfcp_data.fsf_req_qtcb_cache);
 374         if (!adapter->pool.fsf_req_scsi)
 375                 return -ENOMEM;
 376
 377         adapter->pool.fsf_req_abort =
 378                 mempool_create_slab_pool(1, zfcp_data.fsf_req_qtcb_cache);
 379         if (!adapter->pool.fsf_req_abort)
 380                 return -ENOMEM;
 381
 382         adapter->pool.fsf_req_status_read =
 383                 mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM,
 384                                             sizeof(struct zfcp_fsf_req));
 385         if (!adapter->pool.fsf_req_status_read)
 386                 return -ENOMEM;
 387
 388         adapter->pool.data_status_read =
 389                 mempool_create_slab_pool(FSF_STATUS_READS_RECOM,
 390                                          zfcp_data.sr_buffer_cache);
 391         if (!adapter->pool.data_status_read)
 392                 return -ENOMEM;
 393
 394         adapter->pool.data_gid_pn =
 395                 mempool_create_slab_pool(1, zfcp_data.gid_pn_cache);
 396         if (!adapter->pool.data_gid_pn)
 397                 return -ENOMEM;
 398
 399         return 0;
 400 }
 401
 402 static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
 403 {
 404         /* zfcp_data.config_sema must be held */
 405         if (adapter->pool.fsf_req_erp)
 406                 mempool_destroy(adapter->pool.fsf_req_erp);
 407         if (adapter->pool.fsf_req_scsi)
 408                 mempool_destroy(adapter->pool.fsf_req_scsi);
 409         if (adapter->pool.fsf_req_abort)
 410                 mempool_destroy(adapter->pool.fsf_req_abort);
 411         if (adapter->pool.fsf_req_status_read)
 412                 mempool_destroy(adapter->pool.fsf_req_status_read);
 413         if (adapter->pool.data_status_read)
 414                 mempool_destroy(adapter->pool.data_status_read);
 415         if (adapter->pool.data_gid_pn)
 416                 mempool_destroy(adapter->pool.data_gid_pn);
 417 }
 418
 419 static void zfcp_dummy_release(struct device *dev)
 420 {
 421         return;
 422 }
 423
 424 /**
 425  * zfcp_status_read_refill - refill the long running status_read_requests
 426  * @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled
 427  *
 428  * Returns: 0 on success, 1 otherwise
 429  *
 430  * if there are 16 or more status_read requests missing an adapter_reopen
 431  * is triggered
 432  */
 433 int zfcp_status_read_refill(struct zfcp_adapter *adapter)
 434 {
 435         while (atomic_read(&adapter->stat_miss) > 0)
 436                 if (zfcp_fsf_status_read(adapter)) {
 437                         if (atomic_read(&adapter->stat_miss) >= 16) {
 438                                 zfcp_erp_adapter_reopen(adapter, 0, 103, NULL);
 439                                 return 1;
 440                         }
 441                         break;
 442                 } else
 443                         atomic_dec(&adapter->stat_miss);
 444         return 0;
 445 }
 446
 447 static void _zfcp_status_read_scheduler(struct work_struct *work)
 448 {
 449         zfcp_status_read_refill(container_of(work, struct zfcp_adapter,
 450                                              stat_work));
 451 }
 452
 453 /**
 454  * zfcp_adapter_enqueue - enqueue a new adapter to the list
 455  * @ccw_device: pointer to the struct cc_device
 456  *
 457  * Returns:     0             if a new adapter was successfully enqueued
 458  *              -ENOMEM       if alloc failed
 459  * Enqueues an adapter at the end of the adapter list in the driver data.
 460  * All adapter internal structures are set up.
 461  * Proc-fs entries are also created.
 462  * locks:       config_sema must be held to serialise changes to the adapter list
 463  */
 464 int zfcp_adapter_enqueue(struct ccw_device *ccw_device)
 465 {
 466         struct zfcp_adapter *adapter;
 467
 468         /*
 469          * Note: It is safe to release the list_lock, as any list changes
 470          * are protected by the config_sema, which must be held to get here
 471          */
 472
 473         adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL);
 474         if (!adapter)
 475                 return -ENOMEM;
 476
 477         ccw_device->handler = NULL;
 478         adapter->ccw_device = ccw_device;
 479         atomic_set(&adapter->refcount, 0);
 480
 481         if (zfcp_qdio_allocate(adapter))
 482                 goto qdio_allocate_failed;
 483
 484         if (zfcp_allocate_low_mem_buffers(adapter))
 485                 goto failed_low_mem_buffers;
 486
 487         if (zfcp_reqlist_alloc(adapter))
 488                 goto failed_low_mem_buffers;
 489
 490         if (zfcp_adapter_debug_register(adapter))
 491                 goto debug_register_failed;
 492
 493         init_waitqueue_head(&adapter->remove_wq);
 494         init_waitqueue_head(&adapter->erp_thread_wqh);
 495         init_waitqueue_head(&adapter->erp_done_wqh);
 496
 497         INIT_LIST_HEAD(&adapter->port_list_head);
 498         INIT_LIST_HEAD(&adapter->port_remove_lh);
 499         INIT_LIST_HEAD(&adapter->erp_ready_head);
 500         INIT_LIST_HEAD(&adapter->erp_running_head);
 501
 502         spin_lock_init(&adapter->req_list_lock);
 503
 504         spin_lock_init(&adapter->hba_dbf_lock);
 505         spin_lock_init(&adapter->san_dbf_lock);
 506         spin_lock_init(&adapter->scsi_dbf_lock);
 507         spin_lock_init(&adapter->rec_dbf_lock);
 508         spin_lock_init(&adapter->req_q.lock);
 509
 510         rwlock_init(&adapter->erp_lock);
 511         rwlock_init(&adapter->abort_lock);
 512
 513         sema_init(&adapter->erp_ready_sem, 0);
 514
 515         INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
 516         INIT_WORK(&adapter->scan_work, _zfcp_scan_ports_later);
 517
 518         /* mark adapter unusable as long as sysfs registration is not complete */
 519         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
 520
 521         dev_set_drvdata(&ccw_device->dev, adapter);
 522
 523         if (sysfs_create_group(&ccw_device->dev.kobj,
 524                                &zfcp_sysfs_adapter_attrs))
 525                 goto sysfs_failed;
 526
 527         adapter->generic_services.parent = &adapter->ccw_device->dev;
 528         adapter->generic_services.release = zfcp_dummy_release;
 529         snprintf(adapter->generic_services.bus_id, BUS_ID_SIZE,
 530                  "generic_services");
 531
 532         if (device_register(&adapter->generic_services))
 533                 goto generic_services_failed;
 534
 535         write_lock_irq(&zfcp_data.config_lock);
 536         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
 537         list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
 538         write_unlock_irq(&zfcp_data.config_lock);
 539
 540         zfcp_data.adapters++;
 541
 542         zfcp_fc_nameserver_init(adapter);
 543
 544         return 0;
 545
 546 generic_services_failed:
 547         sysfs_remove_group(&ccw_device->dev.kobj,
 548                            &zfcp_sysfs_adapter_attrs);
 549 sysfs_failed:
 550         zfcp_adapter_debug_unregister(adapter);
 551 debug_register_failed:
 552         dev_set_drvdata(&ccw_device->dev, NULL);
 553         kfree(adapter->req_list);
 554 failed_low_mem_buffers:
 555         zfcp_free_low_mem_buffers(adapter);
 556 qdio_allocate_failed:
 557         zfcp_qdio_free(adapter);
 558         kfree(adapter);
 559         return -ENOMEM;
 560 }
 561
 562 /**
 563  * zfcp_adapter_dequeue - remove the adapter from the resource list
 564  * @adapter: pointer to struct zfcp_adapter which should be removed
 565  * locks:       adapter list write lock is assumed to be held by caller
 566  */
 567 void zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
 568 {
 569         int retval = 0;
 570         unsigned long flags;
 571
 572         cancel_work_sync(&adapter->scan_work);
 573         cancel_work_sync(&adapter->stat_work);
 574         zfcp_adapter_scsi_unregister(adapter);
 575         device_unregister(&adapter->generic_services);
 576         sysfs_remove_group(&adapter->ccw_device->dev.kobj,
 577                            &zfcp_sysfs_adapter_attrs);
 578         dev_set_drvdata(&adapter->ccw_device->dev, NULL);
 579         /* sanity check: no pending FSF requests */
 580         spin_lock_irqsave(&adapter->req_list_lock, flags);
 581         retval = zfcp_reqlist_isempty(adapter);
 582         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 583         if (!retval)
 584                 return;
 585
 586         zfcp_adapter_debug_unregister(adapter);
 587
 588         /* remove specified adapter data structure from list */
 589         write_lock_irq(&zfcp_data.config_lock);
 590         list_del(&adapter->list);
 591         write_unlock_irq(&zfcp_data.config_lock);
 592
 593         /* decrease number of adapters in list */
 594         zfcp_data.adapters--;
 595
 596         zfcp_qdio_free(adapter);
 597
 598         zfcp_free_low_mem_buffers(adapter);
 599         kfree(adapter->req_list);
 600         kfree(adapter->fc_stats);
 601         kfree(adapter->stats_reset_data);
 602         kfree(adapter);
 603 }
 604
 605 static void zfcp_sysfs_port_release(struct device *dev)
 606 {
 607         kfree(container_of(dev, struct zfcp_port, sysfs_device));
 608 }
 609
 610 /**
 611  * zfcp_port_enqueue - enqueue port to port list of adapter
 612  * @adapter: adapter where remote port is added
 613  * @wwpn: WWPN of the remote port to be enqueued
 614  * @status: initial status for the port
 615  * @d_id: destination id of the remote port to be enqueued
 616  * Returns: pointer to enqueued port on success, ERR_PTR on error
 617  * Locks: config_sema must be held to serialize changes to the port list
 618  *
 619  * All port internal structures are set up and the sysfs entry is generated.
 620  * d_id is used to enqueue ports with a well known address like the Directory
 621  * Service for nameserver lookup.
 622  */
 623 struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn,
 624                                      u32 status, u32 d_id)
 625 {
 626         struct zfcp_port *port;
 627         int retval;
 628
 629         port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL);
 630         if (!port)
 631                 return ERR_PTR(-ENOMEM);
 632
 633         init_waitqueue_head(&port->remove_wq);
 634
 635         INIT_LIST_HEAD(&port->unit_list_head);
 636         INIT_LIST_HEAD(&port->unit_remove_lh);
 637         INIT_WORK(&port->gid_pn_work, zfcp_erp_port_strategy_open_lookup);
 638
 639         port->adapter = adapter;
 640         port->d_id = d_id;
 641         port->wwpn = wwpn;
 642
 643         /* mark port unusable as long as sysfs registration is not complete */
 644         atomic_set_mask(status | ZFCP_STATUS_COMMON_REMOVE, &port->status);
 645         atomic_set(&port->refcount, 0);
 646
 647         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", wwpn);
 648         port->sysfs_device.parent = &adapter->ccw_device->dev;
 649
 650         port->sysfs_device.release = zfcp_sysfs_port_release;
 651         dev_set_drvdata(&port->sysfs_device, port);
 652
 653         read_lock_irq(&zfcp_data.config_lock);
 654         if (!(status & ZFCP_STATUS_PORT_NO_WWPN))
 655                 if (zfcp_get_port_by_wwpn(adapter, wwpn)) {
 656                         read_unlock_irq(&zfcp_data.config_lock);
 657                         goto err_out_free;
 658                 }
 659         read_unlock_irq(&zfcp_data.config_lock);
 660
 661         if (device_register(&port->sysfs_device))
 662                 goto err_out_free;
 663
 664         retval = sysfs_create_group(&port->sysfs_device.kobj,
 665                                     &zfcp_sysfs_port_attrs);
 666
 667         if (retval) {
 668                 device_unregister(&port->sysfs_device);
 669                 goto err_out;
 670         }
 671
 672         zfcp_port_get(port);
 673
 674         write_lock_irq(&zfcp_data.config_lock);
 675         list_add_tail(&port->list, &adapter->port_list_head);
 676         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
 677         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
 678         adapter->ports++;
 679
 680         write_unlock_irq(&zfcp_data.config_lock);
 681
 682         zfcp_adapter_get(adapter);
 683         return port;
 684
 685 err_out_free:
 686         kfree(port);
 687 err_out:
 688         return ERR_PTR(-EINVAL);
 689 }
 690
 691 /**
 692  * zfcp_port_dequeue - dequeues a port from the port list of the adapter
 693  * @port: pointer to struct zfcp_port which should be removed
 694  */
 695 void zfcp_port_dequeue(struct zfcp_port *port)
 696 {
 697         wait_event(port->remove_wq, atomic_read(&port->refcount) == 0);
 698         write_lock_irq(&zfcp_data.config_lock);
 699         list_del(&port->list);
 700         port->adapter->ports--;
 701         write_unlock_irq(&zfcp_data.config_lock);
 702         if (port->rport)
 703                 fc_remote_port_delete(port->rport);
 704         port->rport = NULL;
 705         zfcp_adapter_put(port->adapter);
 706         sysfs_remove_group(&port->sysfs_device.kobj, &zfcp_sysfs_port_attrs);
 707         device_unregister(&port->sysfs_device);
 708 }
 709
 710 /**
 711  * zfcp_sg_free_table - free memory used by scatterlists
 712  * @sg: pointer to scatterlist
 713  * @count: number of scatterlist which are to be free'ed
 714  * the scatterlist are expected to reference pages always
 715  */
 716 void zfcp_sg_free_table(struct scatterlist *sg, int count)
 717 {
 718         int i;
 719
 720         for (i = 0; i < count; i++, sg++)
 721                 if (sg)
 722                         free_page((unsigned long) sg_virt(sg));
 723                 else
 724                         break;
 725 }
 726
 727 /**
 728  * zfcp_sg_setup_table - init scatterlist and allocate, assign buffers
 729  * @sg: pointer to struct scatterlist
 730  * @count: number of scatterlists which should be assigned with buffers
 731  * of size page
 732  *
 733  * Returns: 0 on success, -ENOMEM otherwise
 734  */
 735 int zfcp_sg_setup_table(struct scatterlist *sg, int count)
 736 {
 737         void *addr;
 738         int i;
 739
 740         sg_init_table(sg, count);
 741         for (i = 0; i < count; i++, sg++) {
 742                 addr = (void *) get_zeroed_page(GFP_KERNEL);
 743                 if (!addr) {
 744                         zfcp_sg_free_table(sg, i);
 745                         return -ENOMEM;
 746                 }
 747                 sg_set_buf(sg, addr, PAGE_SIZE);
 748         }
 749         return 0;
 750 }