drivers/s390/scsi/zfcp_scsi.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 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_SCSI
  23
  24 #include "zfcp_ext.h"
  25 #include <asm/atomic.h>
  26
  27 static void zfcp_scsi_slave_destroy(struct scsi_device *sdp);
  28 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp);
  29 static int zfcp_scsi_slave_configure(struct scsi_device *sdp);
  30 static int zfcp_scsi_queuecommand(struct scsi_cmnd *,
  31                                   void (*done) (struct scsi_cmnd *));
  32 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *);
  33 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *);
  34 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *);
  35 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *);
  36 static int zfcp_task_management_function(struct zfcp_unit *, u8,
  37                                          struct scsi_cmnd *);
  38
  39 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int,
  40                                           unsigned int, unsigned int);
  41
  42 static struct device_attribute *zfcp_sysfs_sdev_attrs[];
  43
  44 struct zfcp_data zfcp_data = {
  45         .scsi_host_template = {
  46                 .name                   = ZFCP_NAME,
  47                 .module                 = THIS_MODULE,
  48                 .proc_name              = "zfcp",
  49                 .slave_alloc            = zfcp_scsi_slave_alloc,
  50                 .slave_configure        = zfcp_scsi_slave_configure,
  51                 .slave_destroy          = zfcp_scsi_slave_destroy,
  52                 .queuecommand           = zfcp_scsi_queuecommand,
  53                 .eh_abort_handler       = zfcp_scsi_eh_abort_handler,
  54                 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
  55                 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
  56                 .eh_host_reset_handler  = zfcp_scsi_eh_host_reset_handler,
  57                 .can_queue              = 4096,
  58                 .this_id                = -1,
  59                 .sg_tablesize           = ZFCP_MAX_SBALES_PER_REQ,
  60                 .cmd_per_lun            = 1,
  61                 .use_clustering         = 1,
  62                 .sdev_attrs             = zfcp_sysfs_sdev_attrs,
  63                 .max_sectors            = ZFCP_MAX_SECTORS,
  64         },
  65         .driver_version = ZFCP_VERSION,
  66 };
  67
  68 /* Find start of Response Information in FCP response unit*/
  69 char *
  70 zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  71 {
  72         char *fcp_rsp_info_ptr;
  73
  74         fcp_rsp_info_ptr =
  75             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
  76
  77         return fcp_rsp_info_ptr;
  78 }
  79
  80 /* Find start of Sense Information in FCP response unit*/
  81 char *
  82 zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  83 {
  84         char *fcp_sns_info_ptr;
  85
  86         fcp_sns_info_ptr =
  87             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
  88         if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
  89                 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr +
  90                     fcp_rsp_iu->fcp_rsp_len;
  91
  92         return fcp_sns_info_ptr;
  93 }
  94
  95 static fcp_dl_t *
  96 zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd)
  97 {
  98         int additional_length = fcp_cmd->add_fcp_cdb_length << 2;
  99         fcp_dl_t *fcp_dl_addr;
 100
 101         fcp_dl_addr = (fcp_dl_t *)
 102                 ((unsigned char *) fcp_cmd +
 103                  sizeof (struct fcp_cmnd_iu) + additional_length);
 104         /*
 105          * fcp_dl_addr = start address of fcp_cmnd structure +
 106          * size of fixed part + size of dynamically sized add_dcp_cdb field
 107          * SEE FCP-2 documentation
 108          */
 109         return fcp_dl_addr;
 110 }
 111
 112 fcp_dl_t
 113 zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd)
 114 {
 115         return *zfcp_get_fcp_dl_ptr(fcp_cmd);
 116 }
 117
 118 void
 119 zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
 120 {
 121         *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl;
 122 }
 123
 124 /*
 125  * note: it's a bit-or operation not an assignment
 126  * regarding the specified byte
 127  */
 128 static inline void
 129 set_byte(int *result, char status, char pos)
 130 {
 131         *result |= status << (pos * 8);
 132 }
 133
 134 void
 135 set_host_byte(int *result, char status)
 136 {
 137         set_byte(result, status, 2);
 138 }
 139
 140 void
 141 set_driver_byte(int *result, char status)
 142 {
 143         set_byte(result, status, 3);
 144 }
 145
 146 static int
 147 zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 148 {
 149         struct zfcp_adapter *adapter;
 150         struct zfcp_unit *unit;
 151         unsigned long flags;
 152         int retval = -ENXIO;
 153
 154         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 155         if (!adapter)
 156                 goto out;
 157
 158         read_lock_irqsave(&zfcp_data.config_lock, flags);
 159         unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
 160         if (unit && atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED,
 161                                      &unit->status)) {
 162                 sdp->hostdata = unit;
 163                 unit->device = sdp;
 164                 zfcp_unit_get(unit);
 165                 retval = 0;
 166         }
 167         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 168  out:
 169         return retval;
 170 }
 171
 172 /**
 173  * zfcp_scsi_slave_destroy - called when scsi device is removed
 174  *
 175  * Remove reference to associated scsi device for an zfcp_unit.
 176  * Mark zfcp_unit as failed. The scsi device might be deleted via sysfs
 177  * or a scan for this device might have failed.
 178  */
 179 static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
 180 {
 181         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
 182
 183         if (unit) {
 184                 zfcp_erp_wait(unit->port->adapter);
 185                 atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status);
 186                 sdpnt->hostdata = NULL;
 187                 unit->device = NULL;
 188                 zfcp_erp_unit_failed(unit, 12, 0);
 189                 zfcp_unit_put(unit);
 190         } else
 191                 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at "
 192                                 "address %p\n", sdpnt);
 193 }
 194
 195 /*
 196  * called from scsi midlayer to allow finetuning of a device.
 197  */
 198 static int
 199 zfcp_scsi_slave_configure(struct scsi_device *sdp)
 200 {
 201         if (sdp->tagged_supported)
 202                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN);
 203         else
 204                 scsi_adjust_queue_depth(sdp, 0, 1);
 205         return 0;
 206 }
 207
 208 /**
 209  * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function
 210  * @scpnt: pointer to struct scsi_cmnd where result is set
 211  * @result: result to be set in scpnt (e.g. DID_ERROR)
 212  */
 213 static void
 214 zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
 215 {
 216         set_host_byte(&scpnt->result, result);
 217         if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
 218                 zfcp_scsi_dbf_event_result("fail", 4,
 219                         (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
 220                         scpnt, NULL);
 221         /* return directly */
 222         scpnt->scsi_done(scpnt);
 223 }
 224
 225 /**
 226  * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and
 227  *      zfcp_scsi_command_sync
 228  * @adapter: adapter where scsi command is issued
 229  * @unit: unit to which scsi command is sent
 230  * @scpnt: scsi command to be sent
 231  * @timer: timer to be started if request is successfully initiated
 232  *
 233  * Note: In scsi_done function must be set in scpnt.
 234  */
 235 int
 236 zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit,
 237                         struct scsi_cmnd *scpnt, int use_timer)
 238 {
 239         int tmp;
 240         int retval;
 241
 242         retval = 0;
 243
 244         BUG_ON((adapter == NULL) || (adapter != unit->port->adapter));
 245         BUG_ON(scpnt->scsi_done == NULL);
 246
 247         if (unlikely(NULL == unit)) {
 248                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
 249                 goto out;
 250         }
 251
 252         if (unlikely(
 253               atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) ||
 254              !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) {
 255                 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port "
 256                                "0x%016Lx on adapter %s\n",
 257                                unit->fcp_lun, unit->port->wwpn,
 258                                zfcp_get_busid_by_adapter(adapter));
 259                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 260                 goto out;
 261         }
 262
 263         tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, use_timer,
 264                                              ZFCP_REQ_AUTO_CLEANUP);
 265         if (unlikely(tmp == -EBUSY)) {
 266                 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx "
 267                                "on port 0x%016Lx in recovery\n",
 268                                zfcp_get_busid_by_unit(unit),
 269                                unit->fcp_lun, unit->port->wwpn);
 270                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
 271                 goto out;
 272         }
 273
 274         if (unlikely(tmp < 0)) {
 275                 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n");
 276                 retval = SCSI_MLQUEUE_HOST_BUSY;
 277         }
 278
 279 out:
 280         return retval;
 281 }
 282
 283 static void
 284 zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt)
 285 {
 286         struct completion *wait = (struct completion *) scpnt->SCp.ptr;
 287         complete(wait);
 288 }
 289
 290
 291 /**
 292  * zfcp_scsi_command_sync - send a SCSI command and wait for completion
 293  * @unit: unit where command is sent to
 294  * @scpnt: scsi command to be sent
 295  * @use_timer: indicates whether timer should be setup or not
 296  * Return: 0
 297  *
 298  * Errors are indicated in scpnt->result
 299  */
 300 int
 301 zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt,
 302                        int use_timer)
 303 {
 304         int ret;
 305         DECLARE_COMPLETION_ONSTACK(wait);
 306
 307         scpnt->SCp.ptr = (void *) &wait;  /* silent re-use */
 308         scpnt->scsi_done = zfcp_scsi_command_sync_handler;
 309         ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt,
 310                                       use_timer);
 311         if (ret == 0)
 312                 wait_for_completion(&wait);
 313
 314         scpnt->SCp.ptr = NULL;
 315
 316         return 0;
 317 }
 318
 319 /*
 320  * function:    zfcp_scsi_queuecommand
 321  *
 322  * purpose:     enqueues a SCSI command to the specified target device
 323  *
 324  * returns:     0 - success, SCSI command enqueued
 325  *              !0 - failure
 326  */
 327 static int
 328 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
 329                        void (*done) (struct scsi_cmnd *))
 330 {
 331         struct zfcp_unit *unit;
 332         struct zfcp_adapter *adapter;
 333
 334         /* reset the status for this request */
 335         scpnt->result = 0;
 336         scpnt->host_scribble = NULL;
 337         scpnt->scsi_done = done;
 338
 339         /*
 340          * figure out adapter and target device
 341          * (stored there by zfcp_scsi_slave_alloc)
 342          */
 343         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
 344         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 345
 346         return zfcp_scsi_command_async(adapter, unit, scpnt, 0);
 347 }
 348
 349 static struct zfcp_unit *
 350 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, unsigned int id,
 351                  unsigned int lun)
 352 {
 353         struct zfcp_port *port;
 354         struct zfcp_unit *unit, *retval = NULL;
 355
 356         list_for_each_entry(port, &adapter->port_list_head, list) {
 357                 if (!port->rport || (id != port->rport->scsi_target_id))
 358                         continue;
 359                 list_for_each_entry(unit, &port->unit_list_head, list)
 360                         if (lun == unit->scsi_lun) {
 361                                 retval = unit;
 362                                 goto out;
 363                         }
 364         }
 365  out:
 366         return retval;
 367 }
 368
 369 /**
 370  * zfcp_scsi_eh_abort_handler - abort the specified SCSI command
 371  * @scpnt: pointer to scsi_cmnd to be aborted
 372  * Return: SUCCESS - command has been aborted and cleaned up in internal
 373  *          bookkeeping, SCSI stack won't be called for aborted command
 374  *         FAILED - otherwise
 375  *
 376  * We do not need to care for a SCSI command which completes normally
 377  * but late during this abort routine runs.  We are allowed to return
 378  * late commands to the SCSI stack.  It tracks the state of commands and
 379  * will handle late commands.  (Usually, the normal completion of late
 380  * commands is ignored with respect to the running abort operation.)
 381  */
 382 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 383 {
 384         struct Scsi_Host *scsi_host;
 385         struct zfcp_adapter *adapter;
 386         struct zfcp_unit *unit;
 387         struct zfcp_fsf_req *fsf_req;
 388         unsigned long flags;
 389         unsigned long old_req_id;
 390         int retval = SUCCESS;
 391
 392         scsi_host = scpnt->device->host;
 393         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
 394         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 395
 396         ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
 397                       scpnt, zfcp_get_busid_by_adapter(adapter));
 398
 399         /* avoid race condition between late normal completion and abort */
 400         write_lock_irqsave(&adapter->abort_lock, flags);
 401
 402         /* Check whether corresponding fsf_req is still pending */
 403         spin_lock(&adapter->req_list_lock);
 404         fsf_req = zfcp_reqlist_find(adapter,
 405                                     (unsigned long) scpnt->host_scribble);
 406         spin_unlock(&adapter->req_list_lock);
 407         if (!fsf_req) {
 408                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 409                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, 0);
 410                 retval = SUCCESS;
 411                 goto out;
 412         }
 413         fsf_req->data = 0;
 414         fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
 415         old_req_id = fsf_req->req_id;
 416
 417         /* don't access old fsf_req after releasing the abort_lock */
 418         write_unlock_irqrestore(&adapter->abort_lock, flags);
 419
 420         fsf_req = zfcp_fsf_abort_fcp_command(old_req_id, adapter, unit, 0);
 421         if (!fsf_req) {
 422                 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n");
 423                 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
 424                                           old_req_id);
 425                 retval = FAILED;
 426                 goto out;
 427         }
 428
 429         __wait_event(fsf_req->completion_wq,
 430                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 431
 432         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
 433                 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, fsf_req, 0);
 434                 retval = SUCCESS;
 435         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
 436                 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, fsf_req, 0);
 437                 retval = SUCCESS;
 438         } else {
 439                 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, fsf_req, 0);
 440                 retval = FAILED;
 441         }
 442         zfcp_fsf_req_free(fsf_req);
 443  out:
 444         return retval;
 445 }
 446
 447 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 448 {
 449         int retval;
 450         struct zfcp_unit *unit = scpnt->device->hostdata;
 451
 452         if (!unit) {
 453                 WARN_ON(1);
 454                 return SUCCESS;
 455         }
 456         retval = zfcp_task_management_function(unit,
 457                                                FCP_LOGICAL_UNIT_RESET,
 458                                                scpnt);
 459         return retval ? FAILED : SUCCESS;
 460 }
 461
 462 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 463 {
 464         int retval;
 465         struct zfcp_unit *unit = scpnt->device->hostdata;
 466
 467         if (!unit) {
 468                 WARN_ON(1);
 469                 return SUCCESS;
 470         }
 471         retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt);
 472         return retval ? FAILED : SUCCESS;
 473 }
 474
 475 static int
 476 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags,
 477                               struct scsi_cmnd *scpnt)
 478 {
 479         struct zfcp_adapter *adapter = unit->port->adapter;
 480         struct zfcp_fsf_req *fsf_req;
 481         int retval = 0;
 482
 483         /* issue task management function */
 484         fsf_req = zfcp_fsf_send_fcp_command_task_management
 485                 (adapter, unit, tm_flags, 0);
 486         if (!fsf_req) {
 487                 ZFCP_LOG_INFO("error: creation of task management request "
 488                               "failed for unit 0x%016Lx on port 0x%016Lx on  "
 489                               "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
 490                               zfcp_get_busid_by_adapter(adapter));
 491                 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
 492                 retval = -ENOMEM;
 493                 goto out;
 494         }
 495
 496         __wait_event(fsf_req->completion_wq,
 497                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 498
 499         /*
 500          * check completion status of task management function
 501          */
 502         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 503                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
 504                 retval = -EIO;
 505         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
 506                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
 507                 retval = -ENOTSUPP;
 508         } else
 509                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
 510
 511         zfcp_fsf_req_free(fsf_req);
 512  out:
 513         return retval;
 514 }
 515
 516 /**
 517  * zfcp_scsi_eh_host_reset_handler - handler for host reset
 518  */
 519 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 520 {
 521         struct zfcp_unit *unit;
 522         struct zfcp_adapter *adapter;
 523
 524         unit = (struct zfcp_unit*) scpnt->device->hostdata;
 525         adapter = unit->port->adapter;
 526
 527         ZFCP_LOG_NORMAL("host reset because of problems with "
 528                 "unit 0x%016Lx on port 0x%016Lx, adapter %s\n",
 529                 unit->fcp_lun, unit->port->wwpn,
 530                 zfcp_get_busid_by_adapter(unit->port->adapter));
 531
 532         zfcp_erp_adapter_reopen(adapter, 0, 141, (u64)scpnt);
 533         zfcp_erp_wait(adapter);
 534
 535         return SUCCESS;
 536 }
 537
 538 int
 539 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 540 {
 541         int retval = 0;
 542         static unsigned int unique_id = 0;
 543
 544         if (adapter->scsi_host)
 545                 goto out;
 546
 547         /* register adapter as SCSI host with mid layer of SCSI stack */
 548         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 549                                              sizeof (struct zfcp_adapter *));
 550         if (!adapter->scsi_host) {
 551                 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
 552                                 "for adapter %s ",
 553                                 zfcp_get_busid_by_adapter(adapter));
 554                 retval = -EIO;
 555                 goto out;
 556         }
 557         ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
 558
 559         /* tell the SCSI stack some characteristics of this adapter */
 560         adapter->scsi_host->max_id = 1;
 561         adapter->scsi_host->max_lun = 1;
 562         adapter->scsi_host->max_channel = 0;
 563         adapter->scsi_host->unique_id = unique_id++;    /* FIXME */
 564         adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
 565         adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
 566
 567         /*
 568          * save a pointer to our own adapter data structure within
 569          * hostdata field of SCSI host data structure
 570          */
 571         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 572
 573         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 574                 scsi_host_put(adapter->scsi_host);
 575                 retval = -EIO;
 576                 goto out;
 577         }
 578         atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 579  out:
 580         return retval;
 581 }
 582
 583 void
 584 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 585 {
 586         struct Scsi_Host *shost;
 587         struct zfcp_port *port;
 588
 589         shost = adapter->scsi_host;
 590         if (!shost)
 591                 return;
 592         read_lock_irq(&zfcp_data.config_lock);
 593         list_for_each_entry(port, &adapter->port_list_head, list)
 594                 if (port->rport)
 595                         port->rport = NULL;
 596         read_unlock_irq(&zfcp_data.config_lock);
 597         fc_remove_host(shost);
 598         scsi_remove_host(shost);
 599         scsi_host_put(shost);
 600         adapter->scsi_host = NULL;
 601         atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 602
 603         return;
 604 }
 605
 606 /*
 607  * Support functions for FC transport class
 608  */
 609 static struct fc_host_statistics*
 610 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 611 {
 612         struct fc_host_statistics *fc_stats;
 613
 614         if (!adapter->fc_stats) {
 615                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 616                 if (!fc_stats)
 617                         return NULL;
 618                 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
 619         }
 620         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 621         return adapter->fc_stats;
 622 }
 623
 624 static void
 625 zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 626                           struct fsf_qtcb_bottom_port *data,
 627                           struct fsf_qtcb_bottom_port *old)
 628 {
 629         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset -
 630                 old->seconds_since_last_reset;
 631         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 632         fc_stats->tx_words = data->tx_words - old->tx_words;
 633         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 634         fc_stats->rx_words = data->rx_words - old->rx_words;
 635         fc_stats->lip_count = data->lip - old->lip;
 636         fc_stats->nos_count = data->nos - old->nos;
 637         fc_stats->error_frames = data->error_frames - old->error_frames;
 638         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 639         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 640         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 641         fc_stats->loss_of_signal_count = data->loss_of_signal -
 642                 old->loss_of_signal;
 643         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts -
 644                 old->psp_error_counts;
 645         fc_stats->invalid_tx_word_count = data->invalid_tx_words -
 646                 old->invalid_tx_words;
 647         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 648         fc_stats->fcp_input_requests = data->input_requests -
 649                 old->input_requests;
 650         fc_stats->fcp_output_requests = data->output_requests -
 651                 old->output_requests;
 652         fc_stats->fcp_control_requests = data->control_requests -
 653                 old->control_requests;
 654         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 655         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 656 }
 657
 658 static void
 659 zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 660                        struct fsf_qtcb_bottom_port *data)
 661 {
 662         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 663         fc_stats->tx_frames = data->tx_frames;
 664         fc_stats->tx_words = data->tx_words;
 665         fc_stats->rx_frames = data->rx_frames;
 666         fc_stats->rx_words = data->rx_words;
 667         fc_stats->lip_count = data->lip;
 668         fc_stats->nos_count = data->nos;
 669         fc_stats->error_frames = data->error_frames;
 670         fc_stats->dumped_frames = data->dumped_frames;
 671         fc_stats->link_failure_count = data->link_failure;
 672         fc_stats->loss_of_sync_count = data->loss_of_sync;
 673         fc_stats->loss_of_signal_count = data->loss_of_signal;
 674         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 675         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 676         fc_stats->invalid_crc_count = data->invalid_crcs;
 677         fc_stats->fcp_input_requests = data->input_requests;
 678         fc_stats->fcp_output_requests = data->output_requests;
 679         fc_stats->fcp_control_requests = data->control_requests;
 680         fc_stats->fcp_input_megabytes = data->input_mb;
 681         fc_stats->fcp_output_megabytes = data->output_mb;
 682 }
 683
 684 /**
 685  * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc
 686  *
 687  * assumption: scsi_transport_fc synchronizes calls of
 688  *             get_fc_host_stats and reset_fc_host_stats
 689  *             (XXX to be checked otherwise introduce locking)
 690  */
 691 static struct fc_host_statistics *
 692 zfcp_get_fc_host_stats(struct Scsi_Host *shost)
 693 {
 694         struct zfcp_adapter *adapter;
 695         struct fc_host_statistics *fc_stats;
 696         struct fsf_qtcb_bottom_port *data;
 697         int ret;
 698
 699         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 700         fc_stats = zfcp_init_fc_host_stats(adapter);
 701         if (!fc_stats)
 702                 return NULL;
 703
 704         data = kzalloc(sizeof(*data), GFP_KERNEL);
 705         if (!data)
 706                 return NULL;
 707
 708         ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
 709         if (ret) {
 710                 kfree(data);
 711                 return NULL; /* XXX return zeroed fc_stats? */
 712         }
 713
 714         if (adapter->stats_reset &&
 715             ((jiffies/HZ - adapter->stats_reset) <
 716              data->seconds_since_last_reset)) {
 717                 zfcp_adjust_fc_host_stats(fc_stats, data,
 718                                           adapter->stats_reset_data);
 719         } else
 720                 zfcp_set_fc_host_stats(fc_stats, data);
 721
 722         kfree(data);
 723         return fc_stats;
 724 }
 725
 726 static void
 727 zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 728 {
 729         struct zfcp_adapter *adapter;
 730         struct fsf_qtcb_bottom_port *data, *old_data;
 731         int ret;
 732
 733         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 734         data = kzalloc(sizeof(*data), GFP_KERNEL);
 735         if (!data)
 736                 return;
 737
 738         ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
 739         if (ret) {
 740                 kfree(data);
 741         } else {
 742                 adapter->stats_reset = jiffies/HZ;
 743                 old_data = adapter->stats_reset_data;
 744                 adapter->stats_reset_data = data; /* finally freed in
 745                                                      adater_dequeue */
 746                 kfree(old_data);
 747         }
 748 }
 749
 750 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 751 {
 752         rport->dev_loss_tmo = timeout;
 753 }
 754
 755 struct fc_function_template zfcp_transport_functions = {
 756         .show_starget_port_id = 1,
 757         .show_starget_port_name = 1,
 758         .show_starget_node_name = 1,
 759         .show_rport_supported_classes = 1,
 760         .show_rport_maxframe_size = 1,
 761         .show_rport_dev_loss_tmo = 1,
 762         .show_host_node_name = 1,
 763         .show_host_port_name = 1,
 764         .show_host_permanent_port_name = 1,
 765         .show_host_supported_classes = 1,
 766         .show_host_supported_speeds = 1,
 767         .show_host_maxframe_size = 1,
 768         .show_host_serial_number = 1,
 769         .get_fc_host_stats = zfcp_get_fc_host_stats,
 770         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 771         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 772         /* no functions registered for following dynamic attributes but
 773            directly set by LLDD */
 774         .show_host_port_type = 1,
 775         .show_host_speed = 1,
 776         .show_host_port_id = 1,
 777         .disable_target_scan = 1,
 778 };
 779
 780 /**
 781  * ZFCP_DEFINE_SCSI_ATTR
 782  * @_name:   name of show attribute
 783  * @_format: format string
 784  * @_value:  value to print
 785  *
 786  * Generates attribute for a unit.
 787  */
 788 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)                    \
 789 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr,        \
 790                                               char *buf)                 \
 791 {                                                                        \
 792         struct scsi_device *sdev;                                        \
 793         struct zfcp_unit *unit;                                          \
 794                                                                          \
 795         sdev = to_scsi_device(dev);                                      \
 796         unit = sdev->hostdata;                                           \
 797         return sprintf(buf, _format, _value);                            \
 798 }                                                                        \
 799                                                                          \
 800 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
 801
 802 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
 803 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
 804 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
 805
 806 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
 807         &dev_attr_fcp_lun,
 808         &dev_attr_wwpn,
 809         &dev_attr_hba_id,
 810         NULL
 811 };
 812
 813 #undef ZFCP_LOG_AREA