drivers/s390/scsi/zfcp_aux.c

   1 /*
   2  * This file is part of the zfcp device driver for
   3  * FCP adapters for IBM System z9 and zSeries.
   4  *
   5  * (C) Copyright IBM Corp. 2002, 2006
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 /*
  23  * Driver authors:
  24  *            Martin Peschke (originator of the driver)
  25  *            Raimund Schroeder
  26  *            Aron Zeh
  27  *            Wolfgang Taphorn
  28  *            Stefan Bader
  29  *            Heiko Carstens (kernel 2.6 port of the driver)
  30  *            Andreas Herrmann
  31  *            Maxim Shchetynin
  32  *            Volker Sameske
  33  *            Ralph Wuerthner
  34  */
  35
  36 #include "zfcp_ext.h"
  37
  38 /* accumulated log level (module parameter) */
  39 static u32 loglevel = ZFCP_LOG_LEVEL_DEFAULTS;
  40 static char *device;
  41 /*********************** FUNCTION PROTOTYPES *********************************/
  42
  43 /* written against the module interface */
  44 static int __init  zfcp_module_init(void);
  45
  46 /* miscellaneous */
  47 static int zfcp_sg_list_alloc(struct zfcp_sg_list *, size_t);
  48 static void zfcp_sg_list_free(struct zfcp_sg_list *);
  49 static int zfcp_sg_list_copy_from_user(struct zfcp_sg_list *,
  50                                        void __user *, size_t);
  51 static int zfcp_sg_list_copy_to_user(void __user *,
  52                                      struct zfcp_sg_list *, size_t);
  53 static long zfcp_cfdc_dev_ioctl(struct file *, unsigned int, unsigned long);
  54
  55 #define ZFCP_CFDC_IOC_MAGIC                     0xDD
  56 #define ZFCP_CFDC_IOC \
  57         _IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_sense_data)
  58
  59
  60 static const struct file_operations zfcp_cfdc_fops = {
  61         .unlocked_ioctl = zfcp_cfdc_dev_ioctl,
  62 #ifdef CONFIG_COMPAT
  63         .compat_ioctl = zfcp_cfdc_dev_ioctl
  64 #endif
  65 };
  66
  67 static struct miscdevice zfcp_cfdc_misc = {
  68         .minor = ZFCP_CFDC_DEV_MINOR,
  69         .name = ZFCP_CFDC_DEV_NAME,
  70         .fops = &zfcp_cfdc_fops
  71 };
  72
  73 /*********************** KERNEL/MODULE PARAMETERS  ***************************/
  74
  75 /* declare driver module init/cleanup functions */
  76 module_init(zfcp_module_init);
  77
  78 MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com");
  79 MODULE_DESCRIPTION
  80     ("FCP (SCSI over Fibre Channel) HBA driver for IBM System z9 and zSeries");
  81 MODULE_LICENSE("GPL");
  82
  83 module_param(device, charp, 0400);
  84 MODULE_PARM_DESC(device, "specify initial device");
  85
  86 module_param(loglevel, uint, 0400);
  87 MODULE_PARM_DESC(loglevel,
  88                  "log levels, 8 nibbles: "
  89                  "FC ERP QDIO CIO Config FSF SCSI Other, "
  90                  "levels: 0=none 1=normal 2=devel 3=trace");
  91
  92 /****************************************************************/
  93 /************** Functions without logging ***********************/
  94 /****************************************************************/
  95
  96 void
  97 _zfcp_hex_dump(char *addr, int count)
  98 {
  99         int i;
 100         for (i = 0; i < count; i++) {
 101                 printk("%02x", addr[i]);
 102                 if ((i % 4) == 3)
 103                         printk(" ");
 104                 if ((i % 32) == 31)
 105                         printk("\n");
 106         }
 107         if (((i-1) % 32) != 31)
 108                 printk("\n");
 109 }
 110
 111
 112 /****************************************************************/
 113 /****** Functions to handle the request ID hash table    ********/
 114 /****************************************************************/
 115
 116 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_FSF
 117
 118 static int zfcp_reqlist_alloc(struct zfcp_adapter *adapter)
 119 {
 120         int idx;
 121
 122         adapter->req_list = kcalloc(REQUEST_LIST_SIZE, sizeof(struct list_head),
 123                                     GFP_KERNEL);
 124         if (!adapter->req_list)
 125                 return -ENOMEM;
 126
 127         for (idx = 0; idx < REQUEST_LIST_SIZE; idx++)
 128                 INIT_LIST_HEAD(&adapter->req_list[idx]);
 129         return 0;
 130 }
 131
 132 static void zfcp_reqlist_free(struct zfcp_adapter *adapter)
 133 {
 134         kfree(adapter->req_list);
 135 }
 136
 137 int zfcp_reqlist_isempty(struct zfcp_adapter *adapter)
 138 {
 139         unsigned int idx;
 140
 141         for (idx = 0; idx < REQUEST_LIST_SIZE; idx++)
 142                 if (!list_empty(&adapter->req_list[idx]))
 143                         return 0;
 144         return 1;
 145 }
 146
 147 #undef ZFCP_LOG_AREA
 148
 149 /****************************************************************/
 150 /************** Uncategorised Functions *************************/
 151 /****************************************************************/
 152
 153 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_OTHER
 154
 155 /**
 156  * zfcp_device_setup - setup function
 157  * @str: pointer to parameter string
 158  *
 159  * Parse "device=..." parameter string.
 160  */
 161 static int __init
 162 zfcp_device_setup(char *devstr)
 163 {
 164         char *tmp, *str;
 165         size_t len;
 166
 167         if (!devstr)
 168                 return 0;
 169
 170         len = strlen(devstr) + 1;
 171         str = kmalloc(len, GFP_KERNEL);
 172         if (!str)
 173                 goto err_out;
 174         memcpy(str, devstr, len);
 175
 176         tmp = strchr(str, ',');
 177         if (!tmp)
 178                 goto err_out;
 179         *tmp++ = '\0';
 180         strncpy(zfcp_data.init_busid, str, BUS_ID_SIZE);
 181         zfcp_data.init_busid[BUS_ID_SIZE-1] = '\0';
 182
 183         zfcp_data.init_wwpn = simple_strtoull(tmp, &tmp, 0);
 184         if (*tmp++ != ',')
 185                 goto err_out;
 186         if (*tmp == '\0')
 187                 goto err_out;
 188
 189         zfcp_data.init_fcp_lun = simple_strtoull(tmp, &tmp, 0);
 190         if (*tmp != '\0')
 191                 goto err_out;
 192         kfree(str);
 193         return 1;
 194
 195  err_out:
 196         ZFCP_LOG_NORMAL("Parse error for device parameter string %s\n", str);
 197         kfree(str);
 198         return 0;
 199 }
 200
 201 static void __init
 202 zfcp_init_device_configure(void)
 203 {
 204         struct zfcp_adapter *adapter;
 205         struct zfcp_port *port;
 206         struct zfcp_unit *unit;
 207
 208         down(&zfcp_data.config_sema);
 209         read_lock_irq(&zfcp_data.config_lock);
 210         adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
 211         if (adapter)
 212                 zfcp_adapter_get(adapter);
 213         read_unlock_irq(&zfcp_data.config_lock);
 214
 215         if (adapter == NULL)
 216                 goto out_adapter;
 217         port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
 218         if (!port)
 219                 goto out_port;
 220         unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
 221         if (!unit)
 222                 goto out_unit;
 223         up(&zfcp_data.config_sema);
 224         ccw_device_set_online(adapter->ccw_device);
 225         zfcp_erp_wait(adapter);
 226         down(&zfcp_data.config_sema);
 227         zfcp_unit_put(unit);
 228  out_unit:
 229         zfcp_port_put(port);
 230  out_port:
 231         zfcp_adapter_put(adapter);
 232  out_adapter:
 233         up(&zfcp_data.config_sema);
 234         return;
 235 }
 236
 237 static int calc_alignment(int size)
 238 {
 239         int align = 1;
 240
 241         if (!size)
 242                 return 0;
 243
 244         while ((size - align) > 0)
 245                 align <<= 1;
 246
 247         return align;
 248 }
 249
 250 static int __init
 251 zfcp_module_init(void)
 252 {
 253         int retval = -ENOMEM;
 254         int size, align;
 255
 256         size = sizeof(struct zfcp_fsf_req_qtcb);
 257         align = calc_alignment(size);
 258         zfcp_data.fsf_req_qtcb_cache =
 259                 kmem_cache_create("zfcp_fsf", size, align, 0, NULL);
 260         if (!zfcp_data.fsf_req_qtcb_cache)
 261                 goto out;
 262
 263         size = sizeof(struct fsf_status_read_buffer);
 264         align = calc_alignment(size);
 265         zfcp_data.sr_buffer_cache =
 266                 kmem_cache_create("zfcp_sr", size, align, 0, NULL);
 267         if (!zfcp_data.sr_buffer_cache)
 268                 goto out_sr_cache;
 269
 270         size = sizeof(struct zfcp_gid_pn_data);
 271         align = calc_alignment(size);
 272         zfcp_data.gid_pn_cache =
 273                 kmem_cache_create("zfcp_gid", size, align, 0, NULL);
 274         if (!zfcp_data.gid_pn_cache)
 275                 goto out_gid_cache;
 276
 277         atomic_set(&zfcp_data.loglevel, loglevel);
 278
 279         /* initialize adapter list */
 280         INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
 281
 282         /* initialize adapters to be removed list head */
 283         INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
 284
 285         zfcp_data.scsi_transport_template =
 286                 fc_attach_transport(&zfcp_transport_functions);
 287         if (!zfcp_data.scsi_transport_template)
 288                 goto out_transport;
 289
 290         retval = misc_register(&zfcp_cfdc_misc);
 291         if (retval != 0) {
 292                 ZFCP_LOG_INFO("registration of misc device "
 293                               "zfcp_cfdc failed\n");
 294                 goto out_misc;
 295         }
 296
 297         ZFCP_LOG_TRACE("major/minor for zfcp_cfdc: %d/%d\n",
 298                        ZFCP_CFDC_DEV_MAJOR, zfcp_cfdc_misc.minor);
 299
 300         /* Initialise proc semaphores */
 301         sema_init(&zfcp_data.config_sema, 1);
 302
 303         /* initialise configuration rw lock */
 304         rwlock_init(&zfcp_data.config_lock);
 305
 306         /* setup dynamic I/O */
 307         retval = zfcp_ccw_register();
 308         if (retval) {
 309                 ZFCP_LOG_NORMAL("registration with common I/O layer failed\n");
 310                 goto out_ccw_register;
 311         }
 312
 313         if (zfcp_device_setup(device))
 314                 zfcp_init_device_configure();
 315
 316         goto out;
 317
 318  out_ccw_register:
 319         misc_deregister(&zfcp_cfdc_misc);
 320  out_misc:
 321         fc_release_transport(zfcp_data.scsi_transport_template);
 322  out_transport:
 323         kmem_cache_destroy(zfcp_data.gid_pn_cache);
 324  out_gid_cache:
 325         kmem_cache_destroy(zfcp_data.sr_buffer_cache);
 326  out_sr_cache:
 327         kmem_cache_destroy(zfcp_data.fsf_req_qtcb_cache);
 328  out:
 329         return retval;
 330 }
 331
 332 /*
 333  * function:    zfcp_cfdc_dev_ioctl
 334  *
 335  * purpose:     Handle control file upload/download transaction via IOCTL
 336  *              interface
 337  *
 338  * returns:     0           - Operation completed successfuly
 339  *              -ENOTTY     - Unknown IOCTL command
 340  *              -EINVAL     - Invalid sense data record
 341  *              -ENXIO      - The FCP adapter is not available
 342  *              -EOPNOTSUPP - The FCP adapter does not have CFDC support
 343  *              -ENOMEM     - Insufficient memory
 344  *              -EFAULT     - User space memory I/O operation fault
 345  *              -EPERM      - Cannot create or queue FSF request or create SBALs
 346  *              -ERESTARTSYS- Received signal (is mapped to EAGAIN by VFS)
 347  */
 348 static long
 349 zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
 350                     unsigned long buffer)
 351 {
 352         struct zfcp_cfdc_sense_data *sense_data, __user *sense_data_user;
 353         struct zfcp_adapter *adapter = NULL;
 354         struct zfcp_fsf_req *fsf_req = NULL;
 355         struct zfcp_sg_list *sg_list = NULL;
 356         u32 fsf_command, option;
 357         char *bus_id = NULL;
 358         int retval = 0;
 359
 360         sense_data = kmalloc(sizeof(struct zfcp_cfdc_sense_data), GFP_KERNEL);
 361         if (sense_data == NULL) {
 362                 retval = -ENOMEM;
 363                 goto out;
 364         }
 365
 366         sg_list = kzalloc(sizeof(struct zfcp_sg_list), GFP_KERNEL);
 367         if (sg_list == NULL) {
 368                 retval = -ENOMEM;
 369                 goto out;
 370         }
 371
 372         if (command != ZFCP_CFDC_IOC) {
 373                 ZFCP_LOG_INFO("IOC request code 0x%x invalid\n", command);
 374                 retval = -ENOTTY;
 375                 goto out;
 376         }
 377
 378         if ((sense_data_user = (void __user *) buffer) == NULL) {
 379                 ZFCP_LOG_INFO("sense data record is required\n");
 380                 retval = -EINVAL;
 381                 goto out;
 382         }
 383
 384         retval = copy_from_user(sense_data, sense_data_user,
 385                                 sizeof(struct zfcp_cfdc_sense_data));
 386         if (retval) {
 387                 retval = -EFAULT;
 388                 goto out;
 389         }
 390
 391         if (sense_data->signature != ZFCP_CFDC_SIGNATURE) {
 392                 ZFCP_LOG_INFO("invalid sense data request signature 0x%08x\n",
 393                               ZFCP_CFDC_SIGNATURE);
 394                 retval = -EINVAL;
 395                 goto out;
 396         }
 397
 398         switch (sense_data->command) {
 399
 400         case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
 401                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 402                 option = FSF_CFDC_OPTION_NORMAL_MODE;
 403                 break;
 404
 405         case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
 406                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 407                 option = FSF_CFDC_OPTION_FORCE;
 408                 break;
 409
 410         case ZFCP_CFDC_CMND_FULL_ACCESS:
 411                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 412                 option = FSF_CFDC_OPTION_FULL_ACCESS;
 413                 break;
 414
 415         case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
 416                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
 417                 option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
 418                 break;
 419
 420         case ZFCP_CFDC_CMND_UPLOAD:
 421                 fsf_command = FSF_QTCB_UPLOAD_CONTROL_FILE;
 422                 option = 0;
 423                 break;
 424
 425         default:
 426                 ZFCP_LOG_INFO("invalid command code 0x%08x\n",
 427                               sense_data->command);
 428                 retval = -EINVAL;
 429                 goto out;
 430         }
 431
 432         bus_id = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
 433         if (bus_id == NULL) {
 434                 retval = -ENOMEM;
 435                 goto out;
 436         }
 437         snprintf(bus_id, BUS_ID_SIZE, "%d.%d.%04x",
 438                 (sense_data->devno >> 24),
 439                 (sense_data->devno >> 16) & 0xFF,
 440                 (sense_data->devno & 0xFFFF));
 441
 442         read_lock_irq(&zfcp_data.config_lock);
 443         adapter = zfcp_get_adapter_by_busid(bus_id);
 444         if (adapter)
 445                 zfcp_adapter_get(adapter);
 446         read_unlock_irq(&zfcp_data.config_lock);
 447
 448         kfree(bus_id);
 449
 450         if (adapter == NULL) {
 451                 ZFCP_LOG_INFO("invalid adapter\n");
 452                 retval = -ENXIO;
 453                 goto out;
 454         }
 455
 456         if (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE) {
 457                 retval = zfcp_sg_list_alloc(sg_list,
 458                                             ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
 459                 if (retval) {
 460                         retval = -ENOMEM;
 461                         goto out;
 462                 }
 463         }
 464
 465         if ((sense_data->command & ZFCP_CFDC_DOWNLOAD) &&
 466             (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE)) {
 467                 retval = zfcp_sg_list_copy_from_user(
 468                         sg_list, &sense_data_user->control_file,
 469                         ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
 470                 if (retval) {
 471                         retval = -EFAULT;
 472                         goto out;
 473                 }
 474         }
 475
 476         retval = zfcp_fsf_control_file(adapter, &fsf_req, fsf_command,
 477                                        option, sg_list);
 478         if (retval)
 479                 goto out;
 480
 481         if ((fsf_req->qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
 482             (fsf_req->qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
 483                 retval = -ENXIO;
 484                 goto out;
 485         }
 486
 487         sense_data->fsf_status = fsf_req->qtcb->header.fsf_status;
 488         memcpy(&sense_data->fsf_status_qual,
 489                &fsf_req->qtcb->header.fsf_status_qual,
 490                sizeof(union fsf_status_qual));
 491         memcpy(&sense_data->payloads, &fsf_req->qtcb->bottom.support.els, 256);
 492
 493         retval = copy_to_user(sense_data_user, sense_data,
 494                 sizeof(struct zfcp_cfdc_sense_data));
 495         if (retval) {
 496                 retval = -EFAULT;
 497                 goto out;
 498         }
 499
 500         if (sense_data->command & ZFCP_CFDC_UPLOAD) {
 501                 retval = zfcp_sg_list_copy_to_user(
 502                         &sense_data_user->control_file, sg_list,
 503                         ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
 504                 if (retval) {
 505                         retval = -EFAULT;
 506                         goto out;
 507                 }
 508         }
 509
 510  out:
 511         if (fsf_req != NULL)
 512                 zfcp_fsf_req_free(fsf_req);
 513
 514         if ((adapter != NULL) && (retval != -ENXIO))
 515                 zfcp_adapter_put(adapter);
 516
 517         if (sg_list != NULL) {
 518                 zfcp_sg_list_free(sg_list);
 519                 kfree(sg_list);
 520         }
 521
 522         kfree(sense_data);
 523
 524         return retval;
 525 }
 526
 527
 528 /**
 529  * zfcp_sg_list_alloc - create a scatter-gather list of the specified size
 530  * @sg_list: structure describing a scatter gather list
 531  * @size: size of scatter-gather list
 532  * Return: 0 on success, else -ENOMEM
 533  *
 534  * In sg_list->sg a pointer to the created scatter-gather list is returned,
 535  * or NULL if we run out of memory. sg_list->count specifies the number of
 536  * elements of the scatter-gather list. The maximum size of a single element
 537  * in the scatter-gather list is PAGE_SIZE.
 538  */
 539 static int
 540 zfcp_sg_list_alloc(struct zfcp_sg_list *sg_list, size_t size)
 541 {
 542         struct scatterlist *sg;
 543         unsigned int i;
 544         int retval = 0;
 545         void *address;
 546
 547         BUG_ON(sg_list == NULL);
 548
 549         sg_list->count = size >> PAGE_SHIFT;
 550         if (size & ~PAGE_MASK)
 551                 sg_list->count++;
 552         sg_list->sg = kcalloc(sg_list->count, sizeof(struct scatterlist),
 553                               GFP_KERNEL);
 554         if (sg_list->sg == NULL) {
 555                 sg_list->count = 0;
 556                 retval = -ENOMEM;
 557                 goto out;
 558         }
 559         sg_init_table(sg_list->sg, sg_list->count);
 560
 561         for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++) {
 562                 address = (void *) get_zeroed_page(GFP_KERNEL);
 563                 if (address == NULL) {
 564                         sg_list->count = i;
 565                         zfcp_sg_list_free(sg_list);
 566                         retval = -ENOMEM;
 567                         goto out;
 568                 }
 569                 zfcp_address_to_sg(address, sg, min(size, PAGE_SIZE));
 570                 size -= sg->length;
 571         }
 572
 573  out:
 574         return retval;
 575 }
 576
 577
 578 /**
 579  * zfcp_sg_list_free - free memory of a scatter-gather list
 580  * @sg_list: structure describing a scatter-gather list
 581  *
 582  * Memory for each element in the scatter-gather list is freed.
 583  * Finally sg_list->sg is freed itself and sg_list->count is reset.
 584  */
 585 static void
 586 zfcp_sg_list_free(struct zfcp_sg_list *sg_list)
 587 {
 588         struct scatterlist *sg;
 589         unsigned int i;
 590
 591         BUG_ON(sg_list == NULL);
 592
 593         for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++)
 594                 free_page((unsigned long) zfcp_sg_to_address(sg));
 595
 596         sg_list->count = 0;
 597         kfree(sg_list->sg);
 598 }
 599
 600 /**
 601  * zfcp_sg_size - determine size of a scatter-gather list
 602  * @sg: array of (struct scatterlist)
 603  * @sg_count: elements in array
 604  * Return: size of entire scatter-gather list
 605  */
 606 static size_t zfcp_sg_size(struct scatterlist *sg, unsigned int sg_count)
 607 {
 608         unsigned int i;
 609         struct scatterlist *p;
 610         size_t size;
 611
 612         size = 0;
 613         for (i = 0, p = sg; i < sg_count; i++, p++) {
 614                 BUG_ON(p == NULL);
 615                 size += p->length;
 616         }
 617
 618         return size;
 619 }
 620
 621
 622 /**
 623  * zfcp_sg_list_copy_from_user -copy data from user space to scatter-gather list
 624  * @sg_list: structure describing a scatter-gather list
 625  * @user_buffer: pointer to buffer in user space
 626  * @size: number of bytes to be copied
 627  * Return: 0 on success, -EFAULT if copy_from_user fails.
 628  */
 629 static int
 630 zfcp_sg_list_copy_from_user(struct zfcp_sg_list *sg_list,
 631                             void __user *user_buffer,
 632                             size_t size)
 633 {
 634         struct scatterlist *sg;
 635         unsigned int length;
 636         void *zfcp_buffer;
 637         int retval = 0;
 638
 639         BUG_ON(sg_list == NULL);
 640
 641         if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
 642                 return -EFAULT;
 643
 644         for (sg = sg_list->sg; size > 0; sg++) {
 645                 length = min((unsigned int)size, sg->length);
 646                 zfcp_buffer = zfcp_sg_to_address(sg);
 647                 if (copy_from_user(zfcp_buffer, user_buffer, length)) {
 648                         retval = -EFAULT;
 649                         goto out;
 650                 }
 651                 user_buffer += length;
 652                 size -= length;
 653         }
 654
 655  out:
 656         return retval;
 657 }
 658
 659
 660 /**
 661  * zfcp_sg_list_copy_to_user - copy data from scatter-gather list to user space
 662  * @user_buffer: pointer to buffer in user space
 663  * @sg_list: structure describing a scatter-gather list
 664  * @size: number of bytes to be copied
 665  * Return: 0 on success, -EFAULT if copy_to_user fails
 666  */
 667 static int
 668 zfcp_sg_list_copy_to_user(void __user  *user_buffer,
 669                           struct zfcp_sg_list *sg_list,
 670                           size_t size)
 671 {
 672         struct scatterlist *sg;
 673         unsigned int length;
 674         void *zfcp_buffer;
 675         int retval = 0;
 676
 677         BUG_ON(sg_list == NULL);
 678
 679         if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
 680                 return -EFAULT;
 681
 682         for (sg = sg_list->sg; size > 0; sg++) {
 683                 length = min((unsigned int) size, sg->length);
 684                 zfcp_buffer = zfcp_sg_to_address(sg);
 685                 if (copy_to_user(user_buffer, zfcp_buffer, length)) {
 686                         retval = -EFAULT;
 687                         goto out;
 688                 }
 689                 user_buffer += length;
 690                 size -= length;
 691         }
 692
 693  out:
 694         return retval;
 695 }
 696
 697
 698 #undef ZFCP_LOG_AREA
 699
 700 /****************************************************************/
 701 /****** Functions for configuration/set-up of structures ********/
 702 /****************************************************************/
 703
 704 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG
 705
 706 /**
 707  * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
 708  * @port: pointer to port to search for unit
 709  * @fcp_lun: FCP LUN to search for
 710  * Traverse list of all units of a port and return pointer to a unit
 711  * with the given FCP LUN.
 712  */
 713 struct zfcp_unit *
 714 zfcp_get_unit_by_lun(struct zfcp_port *port, fcp_lun_t fcp_lun)
 715 {
 716         struct zfcp_unit *unit;
 717         int found = 0;
 718
 719         list_for_each_entry(unit, &port->unit_list_head, list) {
 720                 if ((unit->fcp_lun == fcp_lun) &&
 721                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status))
 722                 {
 723                         found = 1;
 724                         break;
 725                 }
 726         }
 727         return found ? unit : NULL;
 728 }
 729
 730 /**
 731  * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
 732  * @adapter: pointer to adapter to search for port
 733  * @wwpn: wwpn to search for
 734  * Traverse list of all ports of an adapter and return pointer to a port
 735  * with the given wwpn.
 736  */
 737 struct zfcp_port *
 738 zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, wwn_t wwpn)
 739 {
 740         struct zfcp_port *port;
 741         int found = 0;
 742
 743         list_for_each_entry(port, &adapter->port_list_head, list) {
 744                 if ((port->wwpn == wwpn) &&
 745                     !(atomic_read(&port->status) &
 746                       (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE))) {
 747                         found = 1;
 748                         break;
 749                 }
 750         }
 751         return found ? port : NULL;
 752 }
 753
 754 /**
 755  * zfcp_get_port_by_did - find port in port list of adapter by d_id
 756  * @adapter: pointer to adapter to search for port
 757  * @d_id: d_id to search for
 758  * Traverse list of all ports of an adapter and return pointer to a port
 759  * with the given d_id.
 760  */
 761 struct zfcp_port *
 762 zfcp_get_port_by_did(struct zfcp_adapter *adapter, u32 d_id)
 763 {
 764         struct zfcp_port *port;
 765         int found = 0;
 766
 767         list_for_each_entry(port, &adapter->port_list_head, list) {
 768                 if ((port->d_id == d_id) &&
 769                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
 770                 {
 771                         found = 1;
 772                         break;
 773                 }
 774         }
 775         return found ? port : NULL;
 776 }
 777
 778 /**
 779  * zfcp_get_adapter_by_busid - find adpater in adapter list by bus_id
 780  * @bus_id: bus_id to search for
 781  * Traverse list of all adapters and return pointer to an adapter
 782  * with the given bus_id.
 783  */
 784 struct zfcp_adapter *
 785 zfcp_get_adapter_by_busid(char *bus_id)
 786 {
 787         struct zfcp_adapter *adapter;
 788         int found = 0;
 789
 790         list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list) {
 791                 if ((strncmp(bus_id, zfcp_get_busid_by_adapter(adapter),
 792                              BUS_ID_SIZE) == 0) &&
 793                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE,
 794                                       &adapter->status)){
 795                         found = 1;
 796                         break;
 797                 }
 798         }
 799         return found ? adapter : NULL;
 800 }
 801
 802 /**
 803  * zfcp_unit_enqueue - enqueue unit to unit list of a port.
 804  * @port: pointer to port where unit is added
 805  * @fcp_lun: FCP LUN of unit to be enqueued
 806  * Return: pointer to enqueued unit on success, NULL on error
 807  * Locks: config_sema must be held to serialize changes to the unit list
 808  *
 809  * Sets up some unit internal structures and creates sysfs entry.
 810  */
 811 struct zfcp_unit *
 812 zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
 813 {
 814         struct zfcp_unit *unit;
 815
 816         /*
 817          * check that there is no unit with this FCP_LUN already in list
 818          * and enqueue it.
 819          * Note: Unlike for the adapter and the port, this is an error
 820          */
 821         read_lock_irq(&zfcp_data.config_lock);
 822         unit = zfcp_get_unit_by_lun(port, fcp_lun);
 823         read_unlock_irq(&zfcp_data.config_lock);
 824         if (unit)
 825                 return NULL;
 826
 827         unit = kzalloc(sizeof (struct zfcp_unit), GFP_KERNEL);
 828         if (!unit)
 829                 return NULL;
 830
 831         /* initialise reference count stuff */
 832         atomic_set(&unit->refcount, 0);
 833         init_waitqueue_head(&unit->remove_wq);
 834
 835         unit->port = port;
 836         unit->fcp_lun = fcp_lun;
 837
 838         /* setup for sysfs registration */
 839         snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
 840         unit->sysfs_device.parent = &port->sysfs_device;
 841         unit->sysfs_device.release = zfcp_sysfs_unit_release;
 842         dev_set_drvdata(&unit->sysfs_device, unit);
 843
 844         /* mark unit unusable as long as sysfs registration is not complete */
 845         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 846
 847         spin_lock_init(&unit->latencies.lock);
 848         unit->latencies.write.channel.min = 0xFFFFFFFF;
 849         unit->latencies.write.fabric.min = 0xFFFFFFFF;
 850         unit->latencies.read.channel.min = 0xFFFFFFFF;
 851         unit->latencies.read.fabric.min = 0xFFFFFFFF;
 852         unit->latencies.cmd.channel.min = 0xFFFFFFFF;
 853         unit->latencies.cmd.fabric.min = 0xFFFFFFFF;
 854
 855         if (device_register(&unit->sysfs_device)) {
 856                 kfree(unit);
 857                 return NULL;
 858         }
 859
 860         if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
 861                 device_unregister(&unit->sysfs_device);
 862                 return NULL;
 863         }
 864
 865         zfcp_unit_get(unit);
 866         unit->scsi_lun = scsilun_to_int((struct scsi_lun *)&unit->fcp_lun);
 867
 868         write_lock_irq(&zfcp_data.config_lock);
 869         list_add_tail(&unit->list, &port->unit_list_head);
 870         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 871         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
 872         write_unlock_irq(&zfcp_data.config_lock);
 873
 874         port->units++;
 875         zfcp_port_get(port);
 876
 877         return unit;
 878 }
 879
 880 void
 881 zfcp_unit_dequeue(struct zfcp_unit *unit)
 882 {
 883         zfcp_unit_wait(unit);
 884         write_lock_irq(&zfcp_data.config_lock);
 885         list_del(&unit->list);
 886         write_unlock_irq(&zfcp_data.config_lock);
 887         unit->port->units--;
 888         zfcp_port_put(unit->port);
 889         zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
 890         device_unregister(&unit->sysfs_device);
 891 }
 892
 893 /*
 894  * Allocates a combined QTCB/fsf_req buffer for erp actions and fcp/SCSI
 895  * commands.
 896  * It also genrates fcp-nameserver request/response buffer and unsolicited
 897  * status read fsf_req buffers.
 898  *
 899  * locks:       must only be called with zfcp_data.config_sema taken
 900  */
 901 static int
 902 zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
 903 {
 904         adapter->pool.fsf_req_erp =
 905                 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ERP_NR,
 906                                          zfcp_data.fsf_req_qtcb_cache);
 907         if (!adapter->pool.fsf_req_erp)
 908                 return -ENOMEM;
 909
 910         adapter->pool.fsf_req_scsi =
 911                 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_SCSI_NR,
 912                                          zfcp_data.fsf_req_qtcb_cache);
 913         if (!adapter->pool.fsf_req_scsi)
 914                 return -ENOMEM;
 915
 916         adapter->pool.fsf_req_abort =
 917                 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ABORT_NR,
 918                                          zfcp_data.fsf_req_qtcb_cache);
 919         if (!adapter->pool.fsf_req_abort)
 920                 return -ENOMEM;
 921
 922         adapter->pool.fsf_req_status_read =
 923                 mempool_create_kmalloc_pool(ZFCP_POOL_STATUS_READ_NR,
 924                                             sizeof(struct zfcp_fsf_req));
 925         if (!adapter->pool.fsf_req_status_read)
 926                 return -ENOMEM;
 927
 928         adapter->pool.data_status_read =
 929                 mempool_create_slab_pool(ZFCP_POOL_STATUS_READ_NR,
 930                                          zfcp_data.sr_buffer_cache);
 931         if (!adapter->pool.data_status_read)
 932                 return -ENOMEM;
 933
 934         adapter->pool.data_gid_pn =
 935                 mempool_create_slab_pool(ZFCP_POOL_DATA_GID_PN_NR,
 936                                          zfcp_data.gid_pn_cache);
 937         if (!adapter->pool.data_gid_pn)
 938                 return -ENOMEM;
 939
 940         return 0;
 941 }
 942
 943 /**
 944  * zfcp_free_low_mem_buffers - free memory pools of an adapter
 945  * @adapter: pointer to zfcp_adapter for which memory pools should be freed
 946  * locking:  zfcp_data.config_sema must be held
 947  */
 948 static void
 949 zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
 950 {
 951         if (adapter->pool.fsf_req_erp)
 952                 mempool_destroy(adapter->pool.fsf_req_erp);
 953         if (adapter->pool.fsf_req_scsi)
 954                 mempool_destroy(adapter->pool.fsf_req_scsi);
 955         if (adapter->pool.fsf_req_abort)
 956                 mempool_destroy(adapter->pool.fsf_req_abort);
 957         if (adapter->pool.fsf_req_status_read)
 958                 mempool_destroy(adapter->pool.fsf_req_status_read);
 959         if (adapter->pool.data_status_read)
 960                 mempool_destroy(adapter->pool.data_status_read);
 961         if (adapter->pool.data_gid_pn)
 962                 mempool_destroy(adapter->pool.data_gid_pn);
 963 }
 964
 965 static void zfcp_dummy_release(struct device *dev)
 966 {
 967         return;
 968 }
 969
 970 int zfcp_status_read_refill(struct zfcp_adapter *adapter)
 971 {
 972         while (atomic_read(&adapter->stat_miss) > 0)
 973                 if (zfcp_fsf_status_read(adapter, ZFCP_WAIT_FOR_SBAL))
 974                         break;
 975         else
 976                 atomic_dec(&adapter->stat_miss);
 977
 978         if (ZFCP_STATUS_READS_RECOM <= atomic_read(&adapter->stat_miss)) {
 979                 zfcp_erp_adapter_reopen(adapter, 0, 103, NULL);
 980                 return 1;
 981         }
 982         return 0;
 983 }
 984
 985 static void _zfcp_status_read_scheduler(struct work_struct *work)
 986 {
 987         zfcp_status_read_refill(container_of(work, struct zfcp_adapter,
 988                                              stat_work));
 989 }
 990
 991 /*
 992  * Enqueues an adapter at the end of the adapter list in the driver data.
 993  * All adapter internal structures are set up.
 994  * Proc-fs entries are also created.
 995  *
 996  * returns:     0             if a new adapter was successfully enqueued
 997  *              ZFCP_KNOWN    if an adapter with this devno was already present
 998  *              -ENOMEM       if alloc failed
 999  * locks:       config_sema must be held to serialise changes to the adapter list
1000  */
1001 struct zfcp_adapter *
1002 zfcp_adapter_enqueue(struct ccw_device *ccw_device)
1003 {
1004         int retval = 0;
1005         struct zfcp_adapter *adapter;
1006
1007         /*
1008          * Note: It is safe to release the list_lock, as any list changes
1009          * are protected by the config_sema, which must be held to get here
1010          */
1011
1012         /* try to allocate new adapter data structure (zeroed) */
1013         adapter = kzalloc(sizeof (struct zfcp_adapter), GFP_KERNEL);
1014         if (!adapter) {
1015                 ZFCP_LOG_INFO("error: allocation of base adapter "
1016                               "structure failed\n");
1017                 goto out;
1018         }
1019
1020         ccw_device->handler = NULL;
1021
1022         /* save ccw_device pointer */
1023         adapter->ccw_device = ccw_device;
1024
1025         retval = zfcp_qdio_allocate_queues(adapter);
1026         if (retval)
1027                 goto queues_alloc_failed;
1028
1029         retval = zfcp_qdio_allocate(adapter);
1030         if (retval)
1031                 goto qdio_allocate_failed;
1032
1033         retval = zfcp_allocate_low_mem_buffers(adapter);
1034         if (retval) {
1035                 ZFCP_LOG_INFO("error: pool allocation failed\n");
1036                 goto failed_low_mem_buffers;
1037         }
1038
1039         /* initialise reference count stuff */
1040         atomic_set(&adapter->refcount, 0);
1041         init_waitqueue_head(&adapter->remove_wq);
1042
1043         /* initialise list of ports */
1044         INIT_LIST_HEAD(&adapter->port_list_head);
1045
1046         /* initialise list of ports to be removed */
1047         INIT_LIST_HEAD(&adapter->port_remove_lh);
1048
1049         /* initialize list of fsf requests */
1050         spin_lock_init(&adapter->req_list_lock);
1051         retval = zfcp_reqlist_alloc(adapter);
1052         if (retval) {
1053                 ZFCP_LOG_INFO("request list initialization failed\n");
1054                 goto failed_low_mem_buffers;
1055         }
1056
1057         /* initialize debug locks */
1058
1059         spin_lock_init(&adapter->hba_dbf_lock);
1060         spin_lock_init(&adapter->san_dbf_lock);
1061         spin_lock_init(&adapter->scsi_dbf_lock);
1062         spin_lock_init(&adapter->rec_dbf_lock);
1063
1064         retval = zfcp_adapter_debug_register(adapter);
1065         if (retval)
1066                 goto debug_register_failed;
1067
1068         /* initialize error recovery stuff */
1069
1070         rwlock_init(&adapter->erp_lock);
1071         sema_init(&adapter->erp_ready_sem, 0);
1072         INIT_LIST_HEAD(&adapter->erp_ready_head);
1073         INIT_LIST_HEAD(&adapter->erp_running_head);
1074
1075         /* initialize abort lock */
1076         rwlock_init(&adapter->abort_lock);
1077
1078         /* initialise some erp stuff */
1079         init_waitqueue_head(&adapter->erp_thread_wqh);
1080         init_waitqueue_head(&adapter->erp_done_wqh);
1081
1082         /* initialize lock of associated request queue */
1083         rwlock_init(&adapter->request_queue.queue_lock);
1084         INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
1085
1086         /* mark adapter unusable as long as sysfs registration is not complete */
1087         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1088
1089         dev_set_drvdata(&ccw_device->dev, adapter);
1090
1091         if (zfcp_sysfs_adapter_create_files(&ccw_device->dev))
1092                 goto sysfs_failed;
1093
1094         adapter->generic_services.parent = &adapter->ccw_device->dev;
1095         adapter->generic_services.release = zfcp_dummy_release;
1096         snprintf(adapter->generic_services.bus_id, BUS_ID_SIZE,
1097                  "generic_services");
1098
1099         if (device_register(&adapter->generic_services))
1100                 goto generic_services_failed;
1101
1102         /* put allocated adapter at list tail */
1103         write_lock_irq(&zfcp_data.config_lock);
1104         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1105         list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
1106         write_unlock_irq(&zfcp_data.config_lock);
1107
1108         zfcp_data.adapters++;
1109
1110         goto out;
1111
1112  generic_services_failed:
1113         zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1114  sysfs_failed:
1115         zfcp_adapter_debug_unregister(adapter);
1116  debug_register_failed:
1117         dev_set_drvdata(&ccw_device->dev, NULL);
1118         zfcp_reqlist_free(adapter);
1119  failed_low_mem_buffers:
1120         zfcp_free_low_mem_buffers(adapter);
1121         if (qdio_free(ccw_device) != 0)
1122                 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1123                                 zfcp_get_busid_by_adapter(adapter));
1124  qdio_allocate_failed:
1125         zfcp_qdio_free_queues(adapter);
1126  queues_alloc_failed:
1127         kfree(adapter);
1128         adapter = NULL;
1129  out:
1130         return adapter;
1131 }
1132
1133 /*
1134  * returns:     0 - struct zfcp_adapter  data structure successfully removed
1135  *              !0 - struct zfcp_adapter  data structure could not be removed
1136  *                      (e.g. still used)
1137  * locks:       adapter list write lock is assumed to be held by caller
1138  */
1139 void
1140 zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
1141 {
1142         int retval = 0;
1143         unsigned long flags;
1144
1145         cancel_work_sync(&adapter->stat_work);
1146         zfcp_adapter_scsi_unregister(adapter);
1147         device_unregister(&adapter->generic_services);
1148         zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1149         dev_set_drvdata(&adapter->ccw_device->dev, NULL);
1150         /* sanity check: no pending FSF requests */
1151         spin_lock_irqsave(&adapter->req_list_lock, flags);
1152         retval = zfcp_reqlist_isempty(adapter);
1153         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
1154         if (!retval) {
1155                 ZFCP_LOG_NORMAL("bug: adapter %s (%p) still in use, "
1156                                 "%i requests outstanding\n",
1157                                 zfcp_get_busid_by_adapter(adapter), adapter,
1158                                 atomic_read(&adapter->reqs_active));
1159                 retval = -EBUSY;
1160                 goto out;
1161         }
1162
1163         zfcp_adapter_debug_unregister(adapter);
1164
1165         /* remove specified adapter data structure from list */
1166         write_lock_irq(&zfcp_data.config_lock);
1167         list_del(&adapter->list);
1168         write_unlock_irq(&zfcp_data.config_lock);
1169
1170         /* decrease number of adapters in list */
1171         zfcp_data.adapters--;
1172
1173         ZFCP_LOG_TRACE("adapter %s (%p) removed from list, "
1174                        "%i adapters still in list\n",
1175                        zfcp_get_busid_by_adapter(adapter),
1176                        adapter, zfcp_data.adapters);
1177
1178         retval = qdio_free(adapter->ccw_device);
1179         if (retval)
1180                 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1181                                 zfcp_get_busid_by_adapter(adapter));
1182
1183         zfcp_free_low_mem_buffers(adapter);
1184         /* free memory of adapter data structure and queues */
1185         zfcp_qdio_free_queues(adapter);
1186         zfcp_reqlist_free(adapter);
1187         kfree(adapter->fc_stats);
1188         kfree(adapter->stats_reset_data);
1189         ZFCP_LOG_TRACE("freeing adapter structure\n");
1190         kfree(adapter);
1191  out:
1192         return;
1193 }
1194
1195 /**
1196  * zfcp_port_enqueue - enqueue port to port list of adapter
1197  * @adapter: adapter where remote port is added
1198  * @wwpn: WWPN of the remote port to be enqueued
1199  * @status: initial status for the port
1200  * @d_id: destination id of the remote port to be enqueued
1201  * Return: pointer to enqueued port on success, NULL on error
1202  * Locks: config_sema must be held to serialize changes to the port list
1203  *
1204  * All port internal structures are set up and the sysfs entry is generated.
1205  * d_id is used to enqueue ports with a well known address like the Directory
1206  * Service for nameserver lookup.
1207  */
1208 struct zfcp_port *
1209 zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
1210                   u32 d_id)
1211 {
1212         struct zfcp_port *port;
1213         int check_wwpn;
1214
1215         check_wwpn = !(status & ZFCP_STATUS_PORT_NO_WWPN);
1216         /*
1217          * check that there is no port with this WWPN already in list
1218          */
1219         if (check_wwpn) {
1220                 read_lock_irq(&zfcp_data.config_lock);
1221                 port = zfcp_get_port_by_wwpn(adapter, wwpn);
1222                 read_unlock_irq(&zfcp_data.config_lock);
1223                 if (port)
1224                         return NULL;
1225         }
1226
1227         port = kzalloc(sizeof (struct zfcp_port), GFP_KERNEL);
1228         if (!port)
1229                 return NULL;
1230
1231         /* initialise reference count stuff */
1232         atomic_set(&port->refcount, 0);
1233         init_waitqueue_head(&port->remove_wq);
1234
1235         INIT_LIST_HEAD(&port->unit_list_head);
1236         INIT_LIST_HEAD(&port->unit_remove_lh);
1237
1238         port->adapter = adapter;
1239
1240         if (check_wwpn)
1241                 port->wwpn = wwpn;
1242
1243         atomic_set_mask(status, &port->status);
1244
1245         /* setup for sysfs registration */
1246         if (status & ZFCP_STATUS_PORT_WKA) {
1247                 switch (d_id) {
1248                 case ZFCP_DID_DIRECTORY_SERVICE:
1249                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1250                                  "directory");
1251                         break;
1252                 case ZFCP_DID_MANAGEMENT_SERVICE:
1253                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1254                                  "management");
1255                         break;
1256                 case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
1257                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1258                                  "key_distribution");
1259                         break;
1260                 case ZFCP_DID_ALIAS_SERVICE:
1261                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1262                                  "alias");
1263                         break;
1264                 case ZFCP_DID_TIME_SERVICE:
1265                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1266                                  "time");
1267                         break;
1268                 default:
1269                         kfree(port);
1270                         return NULL;
1271                 }
1272                 port->d_id = d_id;
1273                 port->sysfs_device.parent = &adapter->generic_services;
1274         } else {
1275                 snprintf(port->sysfs_device.bus_id,
1276                          BUS_ID_SIZE, "0x%016llx", wwpn);
1277                 port->sysfs_device.parent = &adapter->ccw_device->dev;
1278         }
1279         port->sysfs_device.release = zfcp_sysfs_port_release;
1280         dev_set_drvdata(&port->sysfs_device, port);
1281
1282         /* mark port unusable as long as sysfs registration is not complete */
1283         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1284
1285         if (device_register(&port->sysfs_device)) {
1286                 kfree(port);
1287                 return NULL;
1288         }
1289
1290         if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
1291                 device_unregister(&port->sysfs_device);
1292                 return NULL;
1293         }
1294
1295         zfcp_port_get(port);
1296
1297         write_lock_irq(&zfcp_data.config_lock);
1298         list_add_tail(&port->list, &adapter->port_list_head);
1299         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1300         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
1301         if (d_id == ZFCP_DID_DIRECTORY_SERVICE)
1302                 if (!adapter->nameserver_port)
1303                         adapter->nameserver_port = port;
1304         adapter->ports++;
1305         write_unlock_irq(&zfcp_data.config_lock);
1306
1307         zfcp_adapter_get(adapter);
1308
1309         return port;
1310 }
1311
1312 void
1313 zfcp_port_dequeue(struct zfcp_port *port)
1314 {
1315         zfcp_port_wait(port);
1316         write_lock_irq(&zfcp_data.config_lock);
1317         list_del(&port->list);
1318         port->adapter->ports--;
1319         write_unlock_irq(&zfcp_data.config_lock);
1320         if (port->rport)
1321                 fc_remote_port_delete(port->rport);
1322         port->rport = NULL;
1323         zfcp_adapter_put(port->adapter);
1324         zfcp_sysfs_port_remove_files(&port->sysfs_device,
1325                                      atomic_read(&port->status));
1326         device_unregister(&port->sysfs_device);
1327 }
1328
1329 /* Enqueues a nameserver port */
1330 int
1331 zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
1332 {
1333         struct zfcp_port *port;
1334
1335         port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
1336                                  ZFCP_DID_DIRECTORY_SERVICE);
1337         if (!port) {
1338                 ZFCP_LOG_INFO("error: enqueue of nameserver port for "
1339                               "adapter %s failed\n",
1340                               zfcp_get_busid_by_adapter(adapter));
1341                 return -ENXIO;
1342         }
1343         zfcp_port_put(port);
1344
1345         return 0;
1346 }
1347
1348 #undef ZFCP_LOG_AREA