SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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                 atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status);
 185                 sdpnt->hostdata = NULL;
 186                 unit->device = NULL;
 187                 zfcp_erp_unit_failed(unit, 12, NULL);
 188                 zfcp_unit_put(unit);
 189         } else
 190                 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at "
 191                                 "address %p\n", sdpnt);
 192 }
 193
 194 /*
 195  * called from scsi midlayer to allow finetuning of a device.
 196  */
 197 static int
 198 zfcp_scsi_slave_configure(struct scsi_device *sdp)
 199 {
 200         if (sdp->tagged_supported)
 201                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN);
 202         else
 203                 scsi_adjust_queue_depth(sdp, 0, 1);
 204         return 0;
 205 }
 206
 207 /**
 208  * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function
 209  * @scpnt: pointer to struct scsi_cmnd where result is set
 210  * @result: result to be set in scpnt (e.g. DID_ERROR)
 211  */
 212 static void
 213 zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
 214 {
 215         set_host_byte(&scpnt->result, result);
 216         if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
 217                 zfcp_scsi_dbf_event_result("fail", 4,
 218                         (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
 219                         scpnt, NULL);
 220         /* return directly */
 221         scpnt->scsi_done(scpnt);
 222 }
 223
 224 /**
 225  * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and
 226  *      zfcp_scsi_command_sync
 227  * @adapter: adapter where scsi command is issued
 228  * @unit: unit to which scsi command is sent
 229  * @scpnt: scsi command to be sent
 230  * @timer: timer to be started if request is successfully initiated
 231  *
 232  * Note: In scsi_done function must be set in scpnt.
 233  */
 234 int
 235 zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit,
 236                         struct scsi_cmnd *scpnt, int use_timer)
 237 {
 238         int tmp;
 239         int retval;
 240
 241         retval = 0;
 242
 243         BUG_ON((adapter == NULL) || (adapter != unit->port->adapter));
 244         BUG_ON(scpnt->scsi_done == NULL);
 245
 246         if (unlikely(NULL == unit)) {
 247                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
 248                 goto out;
 249         }
 250
 251         if (unlikely(
 252               atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) ||
 253              !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) {
 254                 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port "
 255                                "0x%016Lx on adapter %s\n",
 256                                unit->fcp_lun, unit->port->wwpn,
 257                                zfcp_get_busid_by_adapter(adapter));
 258                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 259                 goto out;
 260         }
 261
 262         tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, use_timer,
 263                                              ZFCP_REQ_AUTO_CLEANUP);
 264         if (unlikely(tmp == -EBUSY)) {
 265                 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx "
 266                                "on port 0x%016Lx in recovery\n",
 267                                zfcp_get_busid_by_unit(unit),
 268                                unit->fcp_lun, unit->port->wwpn);
 269                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
 270                 goto out;
 271         }
 272
 273         if (unlikely(tmp < 0)) {
 274                 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n");
 275                 retval = SCSI_MLQUEUE_HOST_BUSY;
 276         }
 277
 278 out:
 279         return retval;
 280 }
 281
 282 static void
 283 zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt)
 284 {
 285         struct completion *wait = (struct completion *) scpnt->SCp.ptr;
 286         complete(wait);
 287 }
 288
 289
 290 /**
 291  * zfcp_scsi_command_sync - send a SCSI command and wait for completion
 292  * @unit: unit where command is sent to
 293  * @scpnt: scsi command to be sent
 294  * @use_timer: indicates whether timer should be setup or not
 295  * Return: 0
 296  *
 297  * Errors are indicated in scpnt->result
 298  */
 299 int
 300 zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt,
 301                        int use_timer)
 302 {
 303         int ret;
 304         DECLARE_COMPLETION_ONSTACK(wait);
 305
 306         scpnt->SCp.ptr = (void *) &wait;  /* silent re-use */
 307         scpnt->scsi_done = zfcp_scsi_command_sync_handler;
 308         ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt,
 309                                       use_timer);
 310         if (ret == 0)
 311                 wait_for_completion(&wait);
 312
 313         scpnt->SCp.ptr = NULL;
 314
 315         return 0;
 316 }
 317
 318 /*
 319  * function:    zfcp_scsi_queuecommand
 320  *
 321  * purpose:     enqueues a SCSI command to the specified target device
 322  *
 323  * returns:     0 - success, SCSI command enqueued
 324  *              !0 - failure
 325  */
 326 static int
 327 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
 328                        void (*done) (struct scsi_cmnd *))
 329 {
 330         struct zfcp_unit *unit;
 331         struct zfcp_adapter *adapter;
 332
 333         /* reset the status for this request */
 334         scpnt->result = 0;
 335         scpnt->host_scribble = NULL;
 336         scpnt->scsi_done = done;
 337
 338         /*
 339          * figure out adapter and target device
 340          * (stored there by zfcp_scsi_slave_alloc)
 341          */
 342         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
 343         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 344
 345         return zfcp_scsi_command_async(adapter, unit, scpnt, 0);
 346 }
 347
 348 static struct zfcp_unit *
 349 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, unsigned int id,
 350                  unsigned int lun)
 351 {
 352         struct zfcp_port *port;
 353         struct zfcp_unit *unit, *retval = NULL;
 354
 355         list_for_each_entry(port, &adapter->port_list_head, list) {
 356                 if (!port->rport || (id != port->rport->scsi_target_id))
 357                         continue;
 358                 list_for_each_entry(unit, &port->unit_list_head, list)
 359                         if (lun == unit->scsi_lun) {
 360                                 retval = unit;
 361                                 goto out;
 362                         }
 363         }
 364  out:
 365         return retval;
 366 }
 367
 368 /**
 369  * zfcp_scsi_eh_abort_handler - abort the specified SCSI command
 370  * @scpnt: pointer to scsi_cmnd to be aborted
 371  * Return: SUCCESS - command has been aborted and cleaned up in internal
 372  *          bookkeeping, SCSI stack won't be called for aborted command
 373  *         FAILED - otherwise
 374  *
 375  * We do not need to care for a SCSI command which completes normally
 376  * but late during this abort routine runs.  We are allowed to return
 377  * late commands to the SCSI stack.  It tracks the state of commands and
 378  * will handle late commands.  (Usually, the normal completion of late
 379  * commands is ignored with respect to the running abort operation.)
 380  */
 381 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 382 {
 383         struct Scsi_Host *scsi_host;
 384         struct zfcp_adapter *adapter;
 385         struct zfcp_unit *unit;
 386         struct zfcp_fsf_req *fsf_req;
 387         unsigned long flags;
 388         unsigned long old_req_id;
 389         int retval = SUCCESS;
 390
 391         scsi_host = scpnt->device->host;
 392         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
 393         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 394
 395         ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
 396                       scpnt, zfcp_get_busid_by_adapter(adapter));
 397
 398         /* avoid race condition between late normal completion and abort */
 399         write_lock_irqsave(&adapter->abort_lock, flags);
 400
 401         /* Check whether corresponding fsf_req is still pending */
 402         spin_lock(&adapter->req_list_lock);
 403         fsf_req = zfcp_reqlist_find(adapter,
 404                                     (unsigned long) scpnt->host_scribble);
 405         spin_unlock(&adapter->req_list_lock);
 406         if (!fsf_req) {
 407                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 408                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, 0);
 409                 retval = SUCCESS;
 410                 goto out;
 411         }
 412         fsf_req->data = 0;
 413         fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
 414         old_req_id = fsf_req->req_id;
 415
 416         /* don't access old fsf_req after releasing the abort_lock */
 417         write_unlock_irqrestore(&adapter->abort_lock, flags);
 418
 419         fsf_req = zfcp_fsf_abort_fcp_command(old_req_id, adapter, unit, 0);
 420         if (!fsf_req) {
 421                 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n");
 422                 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
 423                                           old_req_id);
 424                 retval = FAILED;
 425                 goto out;
 426         }
 427
 428         __wait_event(fsf_req->completion_wq,
 429                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 430
 431         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
 432                 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, fsf_req, 0);
 433                 retval = SUCCESS;
 434         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
 435                 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, fsf_req, 0);
 436                 retval = SUCCESS;
 437         } else {
 438                 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, fsf_req, 0);
 439                 retval = FAILED;
 440         }
 441         zfcp_fsf_req_free(fsf_req);
 442  out:
 443         return retval;
 444 }
 445
 446 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 447 {
 448         int retval;
 449         struct zfcp_unit *unit = scpnt->device->hostdata;
 450
 451         if (!unit) {
 452                 WARN_ON(1);
 453                 return SUCCESS;
 454         }
 455         retval = zfcp_task_management_function(unit,
 456                                                FCP_LOGICAL_UNIT_RESET,
 457                                                scpnt);
 458         return retval ? FAILED : SUCCESS;
 459 }
 460
 461 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 462 {
 463         int retval;
 464         struct zfcp_unit *unit = scpnt->device->hostdata;
 465
 466         if (!unit) {
 467                 WARN_ON(1);
 468                 return SUCCESS;
 469         }
 470         retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt);
 471         return retval ? FAILED : SUCCESS;
 472 }
 473
 474 static int
 475 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags,
 476                               struct scsi_cmnd *scpnt)
 477 {
 478         struct zfcp_adapter *adapter = unit->port->adapter;
 479         struct zfcp_fsf_req *fsf_req;
 480         int retval = 0;
 481
 482         /* issue task management function */
 483         fsf_req = zfcp_fsf_send_fcp_command_task_management
 484                 (adapter, unit, tm_flags, 0);
 485         if (!fsf_req) {
 486                 ZFCP_LOG_INFO("error: creation of task management request "
 487                               "failed for unit 0x%016Lx on port 0x%016Lx on  "
 488                               "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
 489                               zfcp_get_busid_by_adapter(adapter));
 490                 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
 491                 retval = -ENOMEM;
 492                 goto out;
 493         }
 494
 495         __wait_event(fsf_req->completion_wq,
 496                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 497
 498         /*
 499          * check completion status of task management function
 500          */
 501         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 502                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
 503                 retval = -EIO;
 504         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
 505                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
 506                 retval = -ENOTSUPP;
 507         } else
 508                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
 509
 510         zfcp_fsf_req_free(fsf_req);
 511  out:
 512         return retval;
 513 }
 514
 515 /**
 516  * zfcp_scsi_eh_host_reset_handler - handler for host reset
 517  */
 518 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 519 {
 520         struct zfcp_unit *unit;
 521         struct zfcp_adapter *adapter;
 522
 523         unit = (struct zfcp_unit*) scpnt->device->hostdata;
 524         adapter = unit->port->adapter;
 525
 526         ZFCP_LOG_NORMAL("host reset because of problems with "
 527                 "unit 0x%016Lx on port 0x%016Lx, adapter %s\n",
 528                 unit->fcp_lun, unit->port->wwpn,
 529                 zfcp_get_busid_by_adapter(unit->port->adapter));
 530
 531         zfcp_erp_adapter_reopen(adapter, 0, 141, scpnt);
 532         zfcp_erp_wait(adapter);
 533
 534         return SUCCESS;
 535 }
 536
 537 int
 538 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 539 {
 540         int retval = 0;
 541         static unsigned int unique_id = 0;
 542
 543         if (adapter->scsi_host)
 544                 goto out;
 545
 546         /* register adapter as SCSI host with mid layer of SCSI stack */
 547         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 548                                              sizeof (struct zfcp_adapter *));
 549         if (!adapter->scsi_host) {
 550                 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
 551                                 "for adapter %s ",
 552                                 zfcp_get_busid_by_adapter(adapter));
 553                 retval = -EIO;
 554                 goto out;
 555         }
 556         ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
 557
 558         /* tell the SCSI stack some characteristics of this adapter */
 559         adapter->scsi_host->max_id = 1;
 560         adapter->scsi_host->max_lun = 1;
 561         adapter->scsi_host->max_channel = 0;
 562         adapter->scsi_host->unique_id = unique_id++;    /* FIXME */
 563         adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
 564         adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
 565
 566         /*
 567          * save a pointer to our own adapter data structure within
 568          * hostdata field of SCSI host data structure
 569          */
 570         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 571
 572         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 573                 scsi_host_put(adapter->scsi_host);
 574                 retval = -EIO;
 575                 goto out;
 576         }
 577         atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 578  out:
 579         return retval;
 580 }
 581
 582 void
 583 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 584 {
 585         struct Scsi_Host *shost;
 586         struct zfcp_port *port;
 587
 588         shost = adapter->scsi_host;
 589         if (!shost)
 590                 return;
 591         read_lock_irq(&zfcp_data.config_lock);
 592         list_for_each_entry(port, &adapter->port_list_head, list)
 593                 if (port->rport)
 594                         port->rport = NULL;
 595         read_unlock_irq(&zfcp_data.config_lock);
 596         fc_remove_host(shost);
 597         scsi_remove_host(shost);
 598         scsi_host_put(shost);
 599         adapter->scsi_host = NULL;
 600         atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 601
 602         return;
 603 }
 604
 605 /*
 606  * Support functions for FC transport class
 607  */
 608 static struct fc_host_statistics*
 609 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 610 {
 611         struct fc_host_statistics *fc_stats;
 612
 613         if (!adapter->fc_stats) {
 614                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 615                 if (!fc_stats)
 616                         return NULL;
 617                 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
 618         }
 619         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 620         return adapter->fc_stats;
 621 }
 622
 623 static void
 624 zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 625                           struct fsf_qtcb_bottom_port *data,
 626                           struct fsf_qtcb_bottom_port *old)
 627 {
 628         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset -
 629                 old->seconds_since_last_reset;
 630         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 631         fc_stats->tx_words = data->tx_words - old->tx_words;
 632         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 633         fc_stats->rx_words = data->rx_words - old->rx_words;
 634         fc_stats->lip_count = data->lip - old->lip;
 635         fc_stats->nos_count = data->nos - old->nos;
 636         fc_stats->error_frames = data->error_frames - old->error_frames;
 637         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 638         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 639         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 640         fc_stats->loss_of_signal_count = data->loss_of_signal -
 641                 old->loss_of_signal;
 642         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts -
 643                 old->psp_error_counts;
 644         fc_stats->invalid_tx_word_count = data->invalid_tx_words -
 645                 old->invalid_tx_words;
 646         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 647         fc_stats->fcp_input_requests = data->input_requests -
 648                 old->input_requests;
 649         fc_stats->fcp_output_requests = data->output_requests -
 650                 old->output_requests;
 651         fc_stats->fcp_control_requests = data->control_requests -
 652                 old->control_requests;
 653         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 654         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 655 }
 656
 657 static void
 658 zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 659                        struct fsf_qtcb_bottom_port *data)
 660 {
 661         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 662         fc_stats->tx_frames = data->tx_frames;
 663         fc_stats->tx_words = data->tx_words;
 664         fc_stats->rx_frames = data->rx_frames;
 665         fc_stats->rx_words = data->rx_words;
 666         fc_stats->lip_count = data->lip;
 667         fc_stats->nos_count = data->nos;
 668         fc_stats->error_frames = data->error_frames;
 669         fc_stats->dumped_frames = data->dumped_frames;
 670         fc_stats->link_failure_count = data->link_failure;
 671         fc_stats->loss_of_sync_count = data->loss_of_sync;
 672         fc_stats->loss_of_signal_count = data->loss_of_signal;
 673         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 674         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 675         fc_stats->invalid_crc_count = data->invalid_crcs;
 676         fc_stats->fcp_input_requests = data->input_requests;
 677         fc_stats->fcp_output_requests = data->output_requests;
 678         fc_stats->fcp_control_requests = data->control_requests;
 679         fc_stats->fcp_input_megabytes = data->input_mb;
 680         fc_stats->fcp_output_megabytes = data->output_mb;
 681 }
 682
 683 /**
 684  * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc
 685  *
 686  * assumption: scsi_transport_fc synchronizes calls of
 687  *             get_fc_host_stats and reset_fc_host_stats
 688  *             (XXX to be checked otherwise introduce locking)
 689  */
 690 static struct fc_host_statistics *
 691 zfcp_get_fc_host_stats(struct Scsi_Host *shost)
 692 {
 693         struct zfcp_adapter *adapter;
 694         struct fc_host_statistics *fc_stats;
 695         struct fsf_qtcb_bottom_port *data;
 696         int ret;
 697
 698         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 699         fc_stats = zfcp_init_fc_host_stats(adapter);
 700         if (!fc_stats)
 701                 return NULL;
 702
 703         data = kzalloc(sizeof(*data), GFP_KERNEL);
 704         if (!data)
 705                 return NULL;
 706
 707         ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
 708         if (ret) {
 709                 kfree(data);
 710                 return NULL; /* XXX return zeroed fc_stats? */
 711         }
 712
 713         if (adapter->stats_reset &&
 714             ((jiffies/HZ - adapter->stats_reset) <
 715              data->seconds_since_last_reset)) {
 716                 zfcp_adjust_fc_host_stats(fc_stats, data,
 717                                           adapter->stats_reset_data);
 718         } else
 719                 zfcp_set_fc_host_stats(fc_stats, data);
 720
 721         kfree(data);
 722         return fc_stats;
 723 }
 724
 725 static void
 726 zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 727 {
 728         struct zfcp_adapter *adapter;
 729         struct fsf_qtcb_bottom_port *data, *old_data;
 730         int ret;
 731
 732         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 733         data = kzalloc(sizeof(*data), GFP_KERNEL);
 734         if (!data)
 735                 return;
 736
 737         ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
 738         if (ret) {
 739                 kfree(data);
 740         } else {
 741                 adapter->stats_reset = jiffies/HZ;
 742                 old_data = adapter->stats_reset_data;
 743                 adapter->stats_reset_data = data; /* finally freed in
 744                                                      adater_dequeue */
 745                 kfree(old_data);
 746         }
 747 }
 748
 749 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 750 {
 751         rport->dev_loss_tmo = timeout;
 752 }
 753
 754 struct fc_function_template zfcp_transport_functions = {
 755         .show_starget_port_id = 1,
 756         .show_starget_port_name = 1,
 757         .show_starget_node_name = 1,
 758         .show_rport_supported_classes = 1,
 759         .show_rport_maxframe_size = 1,
 760         .show_rport_dev_loss_tmo = 1,
 761         .show_host_node_name = 1,
 762         .show_host_port_name = 1,
 763         .show_host_permanent_port_name = 1,
 764         .show_host_supported_classes = 1,
 765         .show_host_supported_speeds = 1,
 766         .show_host_maxframe_size = 1,
 767         .show_host_serial_number = 1,
 768         .get_fc_host_stats = zfcp_get_fc_host_stats,
 769         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 770         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 771         /* no functions registered for following dynamic attributes but
 772            directly set by LLDD */
 773         .show_host_port_type = 1,
 774         .show_host_speed = 1,
 775         .show_host_port_id = 1,
 776         .disable_target_scan = 1,
 777 };
 778
 779 /**
 780  * ZFCP_DEFINE_SCSI_ATTR
 781  * @_name:   name of show attribute
 782  * @_format: format string
 783  * @_value:  value to print
 784  *
 785  * Generates attribute for a unit.
 786  */
 787 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)                    \
 788 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr,        \
 789                                               char *buf)                 \
 790 {                                                                        \
 791         struct scsi_device *sdev;                                        \
 792         struct zfcp_unit *unit;                                          \
 793                                                                          \
 794         sdev = to_scsi_device(dev);                                      \
 795         unit = sdev->hostdata;                                           \
 796         return sprintf(buf, _format, _value);                            \
 797 }                                                                        \
 798                                                                          \
 799 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
 800
 801 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
 802 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
 803 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
 804
 805 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
 806         &dev_attr_fcp_lun,
 807         &dev_attr_wwpn,
 808         &dev_attr_hba_id,
 809         NULL
 810 };
 811
 812 #undef ZFCP_LOG_AREA