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   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 /*********************** FUNCTION PROTOTYPES *********************************/
  33
  34 /* written against the module interface */
  35 static int __init  zfcp_module_init(void);
  36
  37 /*********************** KERNEL/MODULE PARAMETERS  ***************************/
  38
  39 /* declare driver module init/cleanup functions */
  40 module_init(zfcp_module_init);
  41
  42 MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com");
  43 MODULE_DESCRIPTION
  44     ("FCP (SCSI over Fibre Channel) HBA driver for IBM System z9 and zSeries");
  45 MODULE_LICENSE("GPL");
  46
  47 module_param(device, charp, 0400);
  48 MODULE_PARM_DESC(device, "specify initial device");
  49
  50 /****************************************************************/
  51 /************** Functions without logging ***********************/
  52 /****************************************************************/
  53
  54 void
  55 _zfcp_hex_dump(char *addr, int count)
  56 {
  57         int i;
  58         for (i = 0; i < count; i++) {
  59                 printk("%02x", addr[i]);
  60                 if ((i % 4) == 3)
  61                         printk(" ");
  62                 if ((i % 32) == 31)
  63                         printk("\n");
  64         }
  65         if (((i-1) % 32) != 31)
  66                 printk("\n");
  67 }
  68
  69
  70 /****************************************************************/
  71 /****** Functions to handle the request ID hash table    ********/
  72 /****************************************************************/
  73
  74 static int zfcp_reqlist_alloc(struct zfcp_adapter *adapter)
  75 {
  76         int idx;
  77
  78         adapter->req_list = kcalloc(REQUEST_LIST_SIZE, sizeof(struct list_head),
  79                                     GFP_KERNEL);
  80         if (!adapter->req_list)
  81                 return -ENOMEM;
  82
  83         for (idx = 0; idx < REQUEST_LIST_SIZE; idx++)
  84                 INIT_LIST_HEAD(&adapter->req_list[idx]);
  85         return 0;
  86 }
  87
  88 static void zfcp_reqlist_free(struct zfcp_adapter *adapter)
  89 {
  90         kfree(adapter->req_list);
  91 }
  92
  93 int zfcp_reqlist_isempty(struct zfcp_adapter *adapter)
  94 {
  95         unsigned int idx;
  96
  97         for (idx = 0; idx < REQUEST_LIST_SIZE; idx++)
  98                 if (!list_empty(&adapter->req_list[idx]))
  99                         return 0;
 100         return 1;
 101 }
 102
 103 /****************************************************************/
 104 /************** Uncategorised Functions *************************/
 105 /****************************************************************/
 106
 107 /**
 108  * zfcp_device_setup - setup function
 109  * @str: pointer to parameter string
 110  *
 111  * Parse "device=..." parameter string.
 112  */
 113 static int __init
 114 zfcp_device_setup(char *devstr)
 115 {
 116         char *tmp, *str;
 117         size_t len;
 118
 119         if (!devstr)
 120                 return 0;
 121
 122         len = strlen(devstr) + 1;
 123         str = kmalloc(len, GFP_KERNEL);
 124         if (!str) {
 125                 pr_err("zfcp: Could not allocate memory for "
 126                        "device parameter string, device not attached.\n");
 127                 return 0;
 128         }
 129         memcpy(str, devstr, len);
 130
 131         tmp = strchr(str, ',');
 132         if (!tmp)
 133                 goto err_out;
 134         *tmp++ = '\0';
 135         strncpy(zfcp_data.init_busid, str, BUS_ID_SIZE);
 136         zfcp_data.init_busid[BUS_ID_SIZE-1] = '\0';
 137
 138         zfcp_data.init_wwpn = simple_strtoull(tmp, &tmp, 0);
 139         if (*tmp++ != ',')
 140                 goto err_out;
 141         if (*tmp == '\0')
 142                 goto err_out;
 143
 144         zfcp_data.init_fcp_lun = simple_strtoull(tmp, &tmp, 0);
 145         if (*tmp != '\0')
 146                 goto err_out;
 147         kfree(str);
 148         return 1;
 149
 150  err_out:
 151         pr_err("zfcp: Parse error for device parameter string %s, "
 152                "device not attached.\n", str);
 153         kfree(str);
 154         return 0;
 155 }
 156
 157 static void __init
 158 zfcp_init_device_configure(void)
 159 {
 160         struct zfcp_adapter *adapter;
 161         struct zfcp_port *port;
 162         struct zfcp_unit *unit;
 163
 164         down(&zfcp_data.config_sema);
 165         read_lock_irq(&zfcp_data.config_lock);
 166         adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
 167         if (adapter)
 168                 zfcp_adapter_get(adapter);
 169         read_unlock_irq(&zfcp_data.config_lock);
 170
 171         if (adapter == NULL)
 172                 goto out_adapter;
 173         port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
 174         if (!port)
 175                 goto out_port;
 176         unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
 177         if (!unit)
 178                 goto out_unit;
 179         up(&zfcp_data.config_sema);
 180         ccw_device_set_online(adapter->ccw_device);
 181         zfcp_erp_wait(adapter);
 182         down(&zfcp_data.config_sema);
 183         zfcp_unit_put(unit);
 184  out_unit:
 185         zfcp_port_put(port);
 186  out_port:
 187         zfcp_adapter_put(adapter);
 188  out_adapter:
 189         up(&zfcp_data.config_sema);
 190         return;
 191 }
 192
 193 static int calc_alignment(int size)
 194 {
 195         int align = 1;
 196
 197         if (!size)
 198                 return 0;
 199
 200         while ((size - align) > 0)
 201                 align <<= 1;
 202
 203         return align;
 204 }
 205
 206 static int __init
 207 zfcp_module_init(void)
 208 {
 209         int retval = -ENOMEM;
 210         int size, align;
 211
 212         size = sizeof(struct zfcp_fsf_req_qtcb);
 213         align = calc_alignment(size);
 214         zfcp_data.fsf_req_qtcb_cache =
 215                 kmem_cache_create("zfcp_fsf", size, align, 0, NULL);
 216         if (!zfcp_data.fsf_req_qtcb_cache)
 217                 goto out;
 218
 219         size = sizeof(struct fsf_status_read_buffer);
 220         align = calc_alignment(size);
 221         zfcp_data.sr_buffer_cache =
 222                 kmem_cache_create("zfcp_sr", size, align, 0, NULL);
 223         if (!zfcp_data.sr_buffer_cache)
 224                 goto out_sr_cache;
 225
 226         size = sizeof(struct zfcp_gid_pn_data);
 227         align = calc_alignment(size);
 228         zfcp_data.gid_pn_cache =
 229                 kmem_cache_create("zfcp_gid", size, align, 0, NULL);
 230         if (!zfcp_data.gid_pn_cache)
 231                 goto out_gid_cache;
 232
 233         /* initialize adapter list */
 234         INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
 235
 236         /* initialize adapters to be removed list head */
 237         INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
 238
 239         zfcp_data.scsi_transport_template =
 240                 fc_attach_transport(&zfcp_transport_functions);
 241         if (!zfcp_data.scsi_transport_template)
 242                 goto out_transport;
 243
 244         retval = misc_register(&zfcp_cfdc_misc);
 245         if (retval != 0) {
 246                 pr_err("zfcp: registration of misc device zfcp_cfdc failed\n");
 247                 goto out_misc;
 248         }
 249
 250         /* Initialise proc semaphores */
 251         sema_init(&zfcp_data.config_sema, 1);
 252
 253         /* initialise configuration rw lock */
 254         rwlock_init(&zfcp_data.config_lock);
 255
 256         /* setup dynamic I/O */
 257         retval = zfcp_ccw_register();
 258         if (retval) {
 259                 pr_err("zfcp: Registration with common I/O layer failed.\n");
 260                 goto out_ccw_register;
 261         }
 262
 263         if (zfcp_device_setup(device))
 264                 zfcp_init_device_configure();
 265
 266         goto out;
 267
 268  out_ccw_register:
 269         misc_deregister(&zfcp_cfdc_misc);
 270  out_misc:
 271         fc_release_transport(zfcp_data.scsi_transport_template);
 272  out_transport:
 273         kmem_cache_destroy(zfcp_data.gid_pn_cache);
 274  out_gid_cache:
 275         kmem_cache_destroy(zfcp_data.sr_buffer_cache);
 276  out_sr_cache:
 277         kmem_cache_destroy(zfcp_data.fsf_req_qtcb_cache);
 278  out:
 279         return retval;
 280 }
 281
 282 /****************************************************************/
 283 /****** Functions for configuration/set-up of structures ********/
 284 /****************************************************************/
 285
 286 /**
 287  * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
 288  * @port: pointer to port to search for unit
 289  * @fcp_lun: FCP LUN to search for
 290  * Traverse list of all units of a port and return pointer to a unit
 291  * with the given FCP LUN.
 292  */
 293 struct zfcp_unit *
 294 zfcp_get_unit_by_lun(struct zfcp_port *port, fcp_lun_t fcp_lun)
 295 {
 296         struct zfcp_unit *unit;
 297         int found = 0;
 298
 299         list_for_each_entry(unit, &port->unit_list_head, list) {
 300                 if ((unit->fcp_lun == fcp_lun) &&
 301                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status))
 302                 {
 303                         found = 1;
 304                         break;
 305                 }
 306         }
 307         return found ? unit : NULL;
 308 }
 309
 310 /**
 311  * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
 312  * @adapter: pointer to adapter to search for port
 313  * @wwpn: wwpn to search for
 314  * Traverse list of all ports of an adapter and return pointer to a port
 315  * with the given wwpn.
 316  */
 317 struct zfcp_port *
 318 zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, wwn_t wwpn)
 319 {
 320         struct zfcp_port *port;
 321         int found = 0;
 322
 323         list_for_each_entry(port, &adapter->port_list_head, list) {
 324                 if ((port->wwpn == wwpn) &&
 325                     !(atomic_read(&port->status) &
 326                       (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE))) {
 327                         found = 1;
 328                         break;
 329                 }
 330         }
 331         return found ? port : NULL;
 332 }
 333
 334 /**
 335  * zfcp_get_port_by_did - find port in port list of adapter by d_id
 336  * @adapter: pointer to adapter to search for port
 337  * @d_id: d_id to search for
 338  * Traverse list of all ports of an adapter and return pointer to a port
 339  * with the given d_id.
 340  */
 341 struct zfcp_port *
 342 zfcp_get_port_by_did(struct zfcp_adapter *adapter, u32 d_id)
 343 {
 344         struct zfcp_port *port;
 345         int found = 0;
 346
 347         list_for_each_entry(port, &adapter->port_list_head, list) {
 348                 if ((port->d_id == d_id) &&
 349                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
 350                 {
 351                         found = 1;
 352                         break;
 353                 }
 354         }
 355         return found ? port : NULL;
 356 }
 357
 358 /**
 359  * zfcp_get_adapter_by_busid - find adpater in adapter list by bus_id
 360  * @bus_id: bus_id to search for
 361  * Traverse list of all adapters and return pointer to an adapter
 362  * with the given bus_id.
 363  */
 364 struct zfcp_adapter *
 365 zfcp_get_adapter_by_busid(char *bus_id)
 366 {
 367         struct zfcp_adapter *adapter;
 368         int found = 0;
 369
 370         list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list) {
 371                 if ((strncmp(bus_id, zfcp_get_busid_by_adapter(adapter),
 372                              BUS_ID_SIZE) == 0) &&
 373                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE,
 374                                       &adapter->status)){
 375                         found = 1;
 376                         break;
 377                 }
 378         }
 379         return found ? adapter : NULL;
 380 }
 381
 382 /**
 383  * zfcp_unit_enqueue - enqueue unit to unit list of a port.
 384  * @port: pointer to port where unit is added
 385  * @fcp_lun: FCP LUN of unit to be enqueued
 386  * Return: pointer to enqueued unit on success, NULL on error
 387  * Locks: config_sema must be held to serialize changes to the unit list
 388  *
 389  * Sets up some unit internal structures and creates sysfs entry.
 390  */
 391 struct zfcp_unit *
 392 zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
 393 {
 394         struct zfcp_unit *unit;
 395
 396         /*
 397          * check that there is no unit with this FCP_LUN already in list
 398          * and enqueue it.
 399          * Note: Unlike for the adapter and the port, this is an error
 400          */
 401         read_lock_irq(&zfcp_data.config_lock);
 402         unit = zfcp_get_unit_by_lun(port, fcp_lun);
 403         read_unlock_irq(&zfcp_data.config_lock);
 404         if (unit)
 405                 return NULL;
 406
 407         unit = kzalloc(sizeof (struct zfcp_unit), GFP_KERNEL);
 408         if (!unit)
 409                 return NULL;
 410
 411         /* initialise reference count stuff */
 412         atomic_set(&unit->refcount, 0);
 413         init_waitqueue_head(&unit->remove_wq);
 414
 415         unit->port = port;
 416         unit->fcp_lun = fcp_lun;
 417
 418         /* setup for sysfs registration */
 419         snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
 420         unit->sysfs_device.parent = &port->sysfs_device;
 421         unit->sysfs_device.release = zfcp_sysfs_unit_release;
 422         dev_set_drvdata(&unit->sysfs_device, unit);
 423
 424         /* mark unit unusable as long as sysfs registration is not complete */
 425         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 426
 427         spin_lock_init(&unit->latencies.lock);
 428         unit->latencies.write.channel.min = 0xFFFFFFFF;
 429         unit->latencies.write.fabric.min = 0xFFFFFFFF;
 430         unit->latencies.read.channel.min = 0xFFFFFFFF;
 431         unit->latencies.read.fabric.min = 0xFFFFFFFF;
 432         unit->latencies.cmd.channel.min = 0xFFFFFFFF;
 433         unit->latencies.cmd.fabric.min = 0xFFFFFFFF;
 434
 435         if (device_register(&unit->sysfs_device)) {
 436                 kfree(unit);
 437                 return NULL;
 438         }
 439
 440         if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
 441                 device_unregister(&unit->sysfs_device);
 442                 return NULL;
 443         }
 444
 445         zfcp_unit_get(unit);
 446         unit->scsi_lun = scsilun_to_int((struct scsi_lun *)&unit->fcp_lun);
 447
 448         write_lock_irq(&zfcp_data.config_lock);
 449         list_add_tail(&unit->list, &port->unit_list_head);
 450         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 451         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
 452         write_unlock_irq(&zfcp_data.config_lock);
 453
 454         port->units++;
 455         zfcp_port_get(port);
 456
 457         return unit;
 458 }
 459
 460 void
 461 zfcp_unit_dequeue(struct zfcp_unit *unit)
 462 {
 463         zfcp_unit_wait(unit);
 464         write_lock_irq(&zfcp_data.config_lock);
 465         list_del(&unit->list);
 466         write_unlock_irq(&zfcp_data.config_lock);
 467         unit->port->units--;
 468         zfcp_port_put(unit->port);
 469         zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
 470         device_unregister(&unit->sysfs_device);
 471 }
 472
 473 /*
 474  * Allocates a combined QTCB/fsf_req buffer for erp actions and fcp/SCSI
 475  * commands.
 476  * It also genrates fcp-nameserver request/response buffer and unsolicited
 477  * status read fsf_req buffers.
 478  *
 479  * locks:       must only be called with zfcp_data.config_sema taken
 480  */
 481 static int
 482 zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
 483 {
 484         adapter->pool.fsf_req_erp =
 485                 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ERP_NR,
 486                                          zfcp_data.fsf_req_qtcb_cache);
 487         if (!adapter->pool.fsf_req_erp)
 488                 return -ENOMEM;
 489
 490         adapter->pool.fsf_req_scsi =
 491                 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_SCSI_NR,
 492                                          zfcp_data.fsf_req_qtcb_cache);
 493         if (!adapter->pool.fsf_req_scsi)
 494                 return -ENOMEM;
 495
 496         adapter->pool.fsf_req_abort =
 497                 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ABORT_NR,
 498                                          zfcp_data.fsf_req_qtcb_cache);
 499         if (!adapter->pool.fsf_req_abort)
 500                 return -ENOMEM;
 501
 502         adapter->pool.fsf_req_status_read =
 503                 mempool_create_kmalloc_pool(ZFCP_POOL_STATUS_READ_NR,
 504                                             sizeof(struct zfcp_fsf_req));
 505         if (!adapter->pool.fsf_req_status_read)
 506                 return -ENOMEM;
 507
 508         adapter->pool.data_status_read =
 509                 mempool_create_slab_pool(ZFCP_POOL_STATUS_READ_NR,
 510                                          zfcp_data.sr_buffer_cache);
 511         if (!adapter->pool.data_status_read)
 512                 return -ENOMEM;
 513
 514         adapter->pool.data_gid_pn =
 515                 mempool_create_slab_pool(ZFCP_POOL_DATA_GID_PN_NR,
 516                                          zfcp_data.gid_pn_cache);
 517         if (!adapter->pool.data_gid_pn)
 518                 return -ENOMEM;
 519
 520         return 0;
 521 }
 522
 523 /**
 524  * zfcp_free_low_mem_buffers - free memory pools of an adapter
 525  * @adapter: pointer to zfcp_adapter for which memory pools should be freed
 526  * locking:  zfcp_data.config_sema must be held
 527  */
 528 static void
 529 zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
 530 {
 531         if (adapter->pool.fsf_req_erp)
 532                 mempool_destroy(adapter->pool.fsf_req_erp);
 533         if (adapter->pool.fsf_req_scsi)
 534                 mempool_destroy(adapter->pool.fsf_req_scsi);
 535         if (adapter->pool.fsf_req_abort)
 536                 mempool_destroy(adapter->pool.fsf_req_abort);
 537         if (adapter->pool.fsf_req_status_read)
 538                 mempool_destroy(adapter->pool.fsf_req_status_read);
 539         if (adapter->pool.data_status_read)
 540                 mempool_destroy(adapter->pool.data_status_read);
 541         if (adapter->pool.data_gid_pn)
 542                 mempool_destroy(adapter->pool.data_gid_pn);
 543 }
 544
 545 static void zfcp_dummy_release(struct device *dev)
 546 {
 547         return;
 548 }
 549
 550 int zfcp_status_read_refill(struct zfcp_adapter *adapter)
 551 {
 552         while (atomic_read(&adapter->stat_miss) > 0)
 553                 if (zfcp_fsf_status_read(adapter, ZFCP_WAIT_FOR_SBAL))
 554                         break;
 555         else
 556                 atomic_dec(&adapter->stat_miss);
 557
 558         if (ZFCP_STATUS_READS_RECOM <= atomic_read(&adapter->stat_miss)) {
 559                 zfcp_erp_adapter_reopen(adapter, 0, 103, NULL);
 560                 return 1;
 561         }
 562         return 0;
 563 }
 564
 565 static void _zfcp_status_read_scheduler(struct work_struct *work)
 566 {
 567         zfcp_status_read_refill(container_of(work, struct zfcp_adapter,
 568                                              stat_work));
 569 }
 570
 571 static int zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
 572 {
 573         struct zfcp_port *port;
 574
 575         port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
 576                                  ZFCP_DID_DIRECTORY_SERVICE);
 577         if (!port)
 578                 return -ENXIO;
 579         zfcp_port_put(port);
 580
 581         return 0;
 582 }
 583
 584 /*
 585  * Enqueues an adapter at the end of the adapter list in the driver data.
 586  * All adapter internal structures are set up.
 587  * Proc-fs entries are also created.
 588  *
 589  * FIXME: Use -ENOMEM as return code for allocation failures
 590  *
 591  * returns:     0             if a new adapter was successfully enqueued
 592  *              ZFCP_KNOWN    if an adapter with this devno was already present
 593  *              -ENOMEM       if alloc failed
 594  * locks:       config_sema must be held to serialise changes to the adapter list
 595  */
 596 struct zfcp_adapter *
 597 zfcp_adapter_enqueue(struct ccw_device *ccw_device)
 598 {
 599         struct zfcp_adapter *adapter;
 600
 601         /*
 602          * Note: It is safe to release the list_lock, as any list changes
 603          * are protected by the config_sema, which must be held to get here
 604          */
 605
 606         /* try to allocate new adapter data structure (zeroed) */
 607         adapter = kzalloc(sizeof (struct zfcp_adapter), GFP_KERNEL);
 608         if (!adapter)
 609                 goto out;
 610
 611         ccw_device->handler = NULL;
 612
 613         /* save ccw_device pointer */
 614         adapter->ccw_device = ccw_device;
 615
 616         if (zfcp_qdio_allocate(adapter))
 617                 goto qdio_allocate_failed;
 618
 619         if (zfcp_allocate_low_mem_buffers(adapter))
 620                 goto failed_low_mem_buffers;
 621
 622         /* initialise reference count stuff */
 623         atomic_set(&adapter->refcount, 0);
 624         init_waitqueue_head(&adapter->remove_wq);
 625
 626         /* initialise list of ports */
 627         INIT_LIST_HEAD(&adapter->port_list_head);
 628
 629         /* initialise list of ports to be removed */
 630         INIT_LIST_HEAD(&adapter->port_remove_lh);
 631
 632         /* initialize list of fsf requests */
 633         spin_lock_init(&adapter->req_list_lock);
 634         if (zfcp_reqlist_alloc(adapter))
 635                 goto failed_low_mem_buffers;
 636
 637         /* initialize debug locks */
 638
 639         spin_lock_init(&adapter->hba_dbf_lock);
 640         spin_lock_init(&adapter->san_dbf_lock);
 641         spin_lock_init(&adapter->scsi_dbf_lock);
 642         spin_lock_init(&adapter->rec_dbf_lock);
 643
 644         if (zfcp_adapter_debug_register(adapter))
 645                 goto debug_register_failed;
 646
 647         /* initialize error recovery stuff */
 648
 649         rwlock_init(&adapter->erp_lock);
 650         sema_init(&adapter->erp_ready_sem, 0);
 651         INIT_LIST_HEAD(&adapter->erp_ready_head);
 652         INIT_LIST_HEAD(&adapter->erp_running_head);
 653
 654         /* initialize abort lock */
 655         rwlock_init(&adapter->abort_lock);
 656
 657         /* initialise some erp stuff */
 658         init_waitqueue_head(&adapter->erp_thread_wqh);
 659         init_waitqueue_head(&adapter->erp_done_wqh);
 660
 661         /* initialize lock of associated request queue */
 662         rwlock_init(&adapter->req_q.lock);
 663         INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
 664         INIT_WORK(&adapter->scan_work, _zfcp_scan_ports_later);
 665
 666         /* mark adapter unusable as long as sysfs registration is not complete */
 667         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
 668
 669         dev_set_drvdata(&ccw_device->dev, adapter);
 670
 671         if (zfcp_sysfs_adapter_create_files(&ccw_device->dev))
 672                 goto sysfs_failed;
 673
 674         adapter->generic_services.parent = &adapter->ccw_device->dev;
 675         adapter->generic_services.release = zfcp_dummy_release;
 676         snprintf(adapter->generic_services.bus_id, BUS_ID_SIZE,
 677                  "generic_services");
 678
 679         if (device_register(&adapter->generic_services))
 680                 goto generic_services_failed;
 681
 682         /* put allocated adapter at list tail */
 683         write_lock_irq(&zfcp_data.config_lock);
 684         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
 685         list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
 686         write_unlock_irq(&zfcp_data.config_lock);
 687
 688         zfcp_data.adapters++;
 689
 690         zfcp_nameserver_enqueue(adapter);
 691
 692         goto out;
 693
 694  generic_services_failed:
 695         zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
 696  sysfs_failed:
 697         zfcp_adapter_debug_unregister(adapter);
 698  debug_register_failed:
 699         dev_set_drvdata(&ccw_device->dev, NULL);
 700         zfcp_reqlist_free(adapter);
 701  failed_low_mem_buffers:
 702         zfcp_free_low_mem_buffers(adapter);
 703  qdio_allocate_failed:
 704         zfcp_qdio_free(adapter);
 705         kfree(adapter);
 706         adapter = NULL;
 707  out:
 708         return adapter;
 709 }
 710
 711 /*
 712  * returns:     0 - struct zfcp_adapter  data structure successfully removed
 713  *              !0 - struct zfcp_adapter  data structure could not be removed
 714  *                      (e.g. still used)
 715  * locks:       adapter list write lock is assumed to be held by caller
 716  */
 717 void
 718 zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
 719 {
 720         int retval = 0;
 721         unsigned long flags;
 722
 723         cancel_work_sync(&adapter->scan_work);
 724         cancel_work_sync(&adapter->stat_work);
 725         zfcp_adapter_scsi_unregister(adapter);
 726         device_unregister(&adapter->generic_services);
 727         zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
 728         dev_set_drvdata(&adapter->ccw_device->dev, NULL);
 729         /* sanity check: no pending FSF requests */
 730         spin_lock_irqsave(&adapter->req_list_lock, flags);
 731         retval = zfcp_reqlist_isempty(adapter);
 732         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 733         if (!retval) {
 734                 retval = -EBUSY;
 735                 goto out;
 736         }
 737
 738         zfcp_adapter_debug_unregister(adapter);
 739
 740         /* remove specified adapter data structure from list */
 741         write_lock_irq(&zfcp_data.config_lock);
 742         list_del(&adapter->list);
 743         write_unlock_irq(&zfcp_data.config_lock);
 744
 745         /* decrease number of adapters in list */
 746         zfcp_data.adapters--;
 747
 748         zfcp_qdio_free(adapter);
 749
 750         zfcp_free_low_mem_buffers(adapter);
 751         zfcp_reqlist_free(adapter);
 752         kfree(adapter->fc_stats);
 753         kfree(adapter->stats_reset_data);
 754         kfree(adapter);
 755  out:
 756         return;
 757 }
 758
 759 /**
 760  * zfcp_port_enqueue - enqueue port to port list of adapter
 761  * @adapter: adapter where remote port is added
 762  * @wwpn: WWPN of the remote port to be enqueued
 763  * @status: initial status for the port
 764  * @d_id: destination id of the remote port to be enqueued
 765  * Return: pointer to enqueued port on success, NULL on error
 766  * Locks: config_sema must be held to serialize changes to the port list
 767  *
 768  * All port internal structures are set up and the sysfs entry is generated.
 769  * d_id is used to enqueue ports with a well known address like the Directory
 770  * Service for nameserver lookup.
 771  */
 772 struct zfcp_port *
 773 zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
 774                   u32 d_id)
 775 {
 776         struct zfcp_port *port;
 777         int check_wwpn;
 778
 779         check_wwpn = !(status & ZFCP_STATUS_PORT_NO_WWPN);
 780         /*
 781          * check that there is no port with this WWPN already in list
 782          */
 783         if (check_wwpn) {
 784                 read_lock_irq(&zfcp_data.config_lock);
 785                 port = zfcp_get_port_by_wwpn(adapter, wwpn);
 786                 read_unlock_irq(&zfcp_data.config_lock);
 787                 if (port)
 788                         return NULL;
 789         }
 790
 791         port = kzalloc(sizeof (struct zfcp_port), GFP_KERNEL);
 792         if (!port)
 793                 return NULL;
 794
 795         /* initialise reference count stuff */
 796         atomic_set(&port->refcount, 0);
 797         init_waitqueue_head(&port->remove_wq);
 798
 799         INIT_LIST_HEAD(&port->unit_list_head);
 800         INIT_LIST_HEAD(&port->unit_remove_lh);
 801
 802         port->adapter = adapter;
 803
 804         if (check_wwpn)
 805                 port->wwpn = wwpn;
 806
 807         atomic_set_mask(status, &port->status);
 808
 809         /* setup for sysfs registration */
 810         if (status & ZFCP_STATUS_PORT_WKA) {
 811                 switch (d_id) {
 812                 case ZFCP_DID_DIRECTORY_SERVICE:
 813                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
 814                                  "directory");
 815                         break;
 816                 case ZFCP_DID_MANAGEMENT_SERVICE:
 817                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
 818                                  "management");
 819                         break;
 820                 case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
 821                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
 822                                  "key_distribution");
 823                         break;
 824                 case ZFCP_DID_ALIAS_SERVICE:
 825                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
 826                                  "alias");
 827                         break;
 828                 case ZFCP_DID_TIME_SERVICE:
 829                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
 830                                  "time");
 831                         break;
 832                 default:
 833                         kfree(port);
 834                         return NULL;
 835                 }
 836                 port->sysfs_device.parent = &adapter->generic_services;
 837         } else {
 838                 snprintf(port->sysfs_device.bus_id,
 839                          BUS_ID_SIZE, "0x%016llx", wwpn);
 840                 port->sysfs_device.parent = &adapter->ccw_device->dev;
 841         }
 842
 843         port->d_id = d_id;
 844
 845         port->sysfs_device.release = zfcp_sysfs_port_release;
 846         dev_set_drvdata(&port->sysfs_device, port);
 847
 848         /* mark port unusable as long as sysfs registration is not complete */
 849         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
 850
 851         if (device_register(&port->sysfs_device)) {
 852                 kfree(port);
 853                 return NULL;
 854         }
 855
 856         if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
 857                 device_unregister(&port->sysfs_device);
 858                 return NULL;
 859         }
 860
 861         zfcp_port_get(port);
 862
 863         write_lock_irq(&zfcp_data.config_lock);
 864         list_add_tail(&port->list, &adapter->port_list_head);
 865         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
 866         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
 867         if (d_id == ZFCP_DID_DIRECTORY_SERVICE)
 868                 if (!adapter->nameserver_port)
 869                         adapter->nameserver_port = port;
 870         adapter->ports++;
 871         write_unlock_irq(&zfcp_data.config_lock);
 872
 873         zfcp_adapter_get(adapter);
 874
 875         return port;
 876 }
 877
 878 void
 879 zfcp_port_dequeue(struct zfcp_port *port)
 880 {
 881         zfcp_port_wait(port);
 882         write_lock_irq(&zfcp_data.config_lock);
 883         list_del(&port->list);
 884         port->adapter->ports--;
 885         write_unlock_irq(&zfcp_data.config_lock);
 886         if (port->rport)
 887                 fc_remote_port_delete(port->rport);
 888         port->rport = NULL;
 889         zfcp_adapter_put(port->adapter);
 890         zfcp_sysfs_port_remove_files(&port->sysfs_device,
 891                                      atomic_read(&port->status));
 892         device_unregister(&port->sysfs_device);
 893 }
 894
 895 void zfcp_sg_free_table(struct scatterlist *sg, int count)
 896 {
 897         int i;
 898
 899         for (i = 0; i < count; i++, sg++)
 900                 if (sg)
 901                         free_page((unsigned long) sg_virt(sg));
 902                 else
 903                         break;
 904 }
 905
 906 int zfcp_sg_setup_table(struct scatterlist *sg, int count)
 907 {
 908         void *addr;
 909         int i;
 910
 911         sg_init_table(sg, count);
 912         for (i = 0; i < count; i++, sg++) {
 913                 addr = (void *) get_zeroed_page(GFP_KERNEL);
 914                 if (!addr) {
 915                         zfcp_sg_free_table(sg, i);
 916                         return -ENOMEM;
 917                 }
 918                 sg_set_buf(sg, addr, PAGE_SIZE);
 919         }
 920         return 0;
 921 }