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_host_reset_handler(struct scsi_cmnd *);
  35 static int zfcp_task_management_function(struct zfcp_unit *, u8,
  36                                          struct scsi_cmnd *);
  37
  38 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int,
  39                                           unsigned int, unsigned int);
  40
  41 static struct device_attribute *zfcp_sysfs_sdev_attrs[];
  42
  43 struct zfcp_data zfcp_data = {
  44         .scsi_host_template = {
  45                 .name                   = ZFCP_NAME,
  46                 .module                 = THIS_MODULE,
  47                 .proc_name              = "zfcp",
  48                 .slave_alloc            = zfcp_scsi_slave_alloc,
  49                 .slave_configure        = zfcp_scsi_slave_configure,
  50                 .slave_destroy          = zfcp_scsi_slave_destroy,
  51                 .queuecommand           = zfcp_scsi_queuecommand,
  52                 .eh_abort_handler       = zfcp_scsi_eh_abort_handler,
  53                 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
  54                 .eh_bus_reset_handler   = zfcp_scsi_eh_host_reset_handler,
  55                 .eh_host_reset_handler  = zfcp_scsi_eh_host_reset_handler,
  56                 .can_queue              = 4096,
  57                 .this_id                = -1,
  58                 .sg_tablesize           = ZFCP_MAX_SBALES_PER_REQ,
  59                 .cmd_per_lun            = 1,
  60                 .use_clustering         = 1,
  61                 .sdev_attrs             = zfcp_sysfs_sdev_attrs,
  62                 .max_sectors            = ZFCP_MAX_SECTORS,
  63         },
  64         .driver_version = ZFCP_VERSION,
  65 };
  66
  67 /* Find start of Response Information in FCP response unit*/
  68 char *
  69 zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  70 {
  71         char *fcp_rsp_info_ptr;
  72
  73         fcp_rsp_info_ptr =
  74             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
  75
  76         return fcp_rsp_info_ptr;
  77 }
  78
  79 /* Find start of Sense Information in FCP response unit*/
  80 char *
  81 zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  82 {
  83         char *fcp_sns_info_ptr;
  84
  85         fcp_sns_info_ptr =
  86             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
  87         if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
  88                 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr +
  89                     fcp_rsp_iu->fcp_rsp_len;
  90
  91         return fcp_sns_info_ptr;
  92 }
  93
  94 static fcp_dl_t *
  95 zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd)
  96 {
  97         int additional_length = fcp_cmd->add_fcp_cdb_length << 2;
  98         fcp_dl_t *fcp_dl_addr;
  99
 100         fcp_dl_addr = (fcp_dl_t *)
 101                 ((unsigned char *) fcp_cmd +
 102                  sizeof (struct fcp_cmnd_iu) + additional_length);
 103         /*
 104          * fcp_dl_addr = start address of fcp_cmnd structure +
 105          * size of fixed part + size of dynamically sized add_dcp_cdb field
 106          * SEE FCP-2 documentation
 107          */
 108         return fcp_dl_addr;
 109 }
 110
 111 fcp_dl_t
 112 zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd)
 113 {
 114         return *zfcp_get_fcp_dl_ptr(fcp_cmd);
 115 }
 116
 117 void
 118 zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
 119 {
 120         *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl;
 121 }
 122
 123 /*
 124  * note: it's a bit-or operation not an assignment
 125  * regarding the specified byte
 126  */
 127 static inline void
 128 set_byte(int *result, char status, char pos)
 129 {
 130         *result |= status << (pos * 8);
 131 }
 132
 133 void
 134 set_host_byte(int *result, char status)
 135 {
 136         set_byte(result, status, 2);
 137 }
 138
 139 void
 140 set_driver_byte(int *result, char status)
 141 {
 142         set_byte(result, status, 3);
 143 }
 144
 145 static int
 146 zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 147 {
 148         struct zfcp_adapter *adapter;
 149         struct zfcp_unit *unit;
 150         unsigned long flags;
 151         int retval = -ENXIO;
 152
 153         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 154         if (!adapter)
 155                 goto out;
 156
 157         read_lock_irqsave(&zfcp_data.config_lock, flags);
 158         unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
 159         if (unit && atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED,
 160                                      &unit->status)) {
 161                 sdp->hostdata = unit;
 162                 unit->device = sdp;
 163                 zfcp_unit_get(unit);
 164                 retval = 0;
 165         }
 166         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 167  out:
 168         return retval;
 169 }
 170
 171 /**
 172  * zfcp_scsi_slave_destroy - called when scsi device is removed
 173  *
 174  * Remove reference to associated scsi device for an zfcp_unit.
 175  * Mark zfcp_unit as failed. The scsi device might be deleted via sysfs
 176  * or a scan for this device might have failed.
 177  */
 178 static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
 179 {
 180         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
 181
 182         if (unit) {
 183                 zfcp_erp_wait(unit->port->adapter);
 184                 wait_event(unit->scsi_scan_wq,
 185                            atomic_test_mask(ZFCP_STATUS_UNIT_SCSI_WORK_PENDING,
 186                                             &unit->status) == 0);
 187                 atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status);
 188                 sdpnt->hostdata = NULL;
 189                 unit->device = NULL;
 190                 zfcp_erp_unit_failed(unit);
 191                 zfcp_unit_put(unit);
 192         } else {
 193                 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at "
 194                                 "address %p\n", sdpnt);
 195         }
 196 }
 197
 198 /*
 199  * called from scsi midlayer to allow finetuning of a device.
 200  */
 201 static int
 202 zfcp_scsi_slave_configure(struct scsi_device *sdp)
 203 {
 204         if (sdp->tagged_supported)
 205                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN);
 206         else
 207                 scsi_adjust_queue_depth(sdp, 0, 1);
 208         return 0;
 209 }
 210
 211 /**
 212  * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function
 213  * @scpnt: pointer to struct scsi_cmnd where result is set
 214  * @result: result to be set in scpnt (e.g. DID_ERROR)
 215  */
 216 static void
 217 zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
 218 {
 219         set_host_byte(&scpnt->result, result);
 220         if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
 221                 zfcp_scsi_dbf_event_result("fail", 4,
 222                         (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
 223                         scpnt, NULL);
 224         /* return directly */
 225         scpnt->scsi_done(scpnt);
 226 }
 227
 228 /**
 229  * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and
 230  *      zfcp_scsi_command_sync
 231  * @adapter: adapter where scsi command is issued
 232  * @unit: unit to which scsi command is sent
 233  * @scpnt: scsi command to be sent
 234  * @timer: timer to be started if request is successfully initiated
 235  *
 236  * Note: In scsi_done function must be set in scpnt.
 237  */
 238 int
 239 zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit,
 240                         struct scsi_cmnd *scpnt, int use_timer)
 241 {
 242         int tmp;
 243         int retval;
 244
 245         retval = 0;
 246
 247         BUG_ON((adapter == NULL) || (adapter != unit->port->adapter));
 248         BUG_ON(scpnt->scsi_done == NULL);
 249
 250         if (unlikely(NULL == unit)) {
 251                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
 252                 goto out;
 253         }
 254
 255         if (unlikely(
 256               atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) ||
 257              !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) {
 258                 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port "
 259                                "0x%016Lx on adapter %s\n",
 260                                unit->fcp_lun, unit->port->wwpn,
 261                                zfcp_get_busid_by_adapter(adapter));
 262                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 263                 goto out;
 264         }
 265
 266         if (unlikely(
 267              !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) {
 268                 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx "
 269                                "on port 0x%016Lx in recovery\n",
 270                                zfcp_get_busid_by_unit(unit),
 271                                unit->fcp_lun, unit->port->wwpn);
 272                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
 273                 goto out;
 274         }
 275
 276         tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, use_timer,
 277                                              ZFCP_REQ_AUTO_CLEANUP);
 278
 279         if (unlikely(tmp < 0)) {
 280                 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n");
 281                 retval = SCSI_MLQUEUE_HOST_BUSY;
 282         }
 283
 284 out:
 285         return retval;
 286 }
 287
 288 static void
 289 zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt)
 290 {
 291         struct completion *wait = (struct completion *) scpnt->SCp.ptr;
 292         complete(wait);
 293 }
 294
 295
 296 /**
 297  * zfcp_scsi_command_sync - send a SCSI command and wait for completion
 298  * @unit: unit where command is sent to
 299  * @scpnt: scsi command to be sent
 300  * @use_timer: indicates whether timer should be setup or not
 301  * Return: 0
 302  *
 303  * Errors are indicated in scpnt->result
 304  */
 305 int
 306 zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt,
 307                        int use_timer)
 308 {
 309         int ret;
 310         DECLARE_COMPLETION_ONSTACK(wait);
 311
 312         scpnt->SCp.ptr = (void *) &wait;  /* silent re-use */
 313         scpnt->scsi_done = zfcp_scsi_command_sync_handler;
 314         ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt,
 315                                       use_timer);
 316         if (ret == 0)
 317                 wait_for_completion(&wait);
 318
 319         scpnt->SCp.ptr = NULL;
 320
 321         return 0;
 322 }
 323
 324 /*
 325  * function:    zfcp_scsi_queuecommand
 326  *
 327  * purpose:     enqueues a SCSI command to the specified target device
 328  *
 329  * returns:     0 - success, SCSI command enqueued
 330  *              !0 - failure
 331  */
 332 static int
 333 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
 334                        void (*done) (struct scsi_cmnd *))
 335 {
 336         struct zfcp_unit *unit;
 337         struct zfcp_adapter *adapter;
 338
 339         /* reset the status for this request */
 340         scpnt->result = 0;
 341         scpnt->host_scribble = NULL;
 342         scpnt->scsi_done = done;
 343
 344         /*
 345          * figure out adapter and target device
 346          * (stored there by zfcp_scsi_slave_alloc)
 347          */
 348         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
 349         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 350
 351         return zfcp_scsi_command_async(adapter, unit, scpnt, 0);
 352 }
 353
 354 static struct zfcp_unit *
 355 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, unsigned int id,
 356                  unsigned int lun)
 357 {
 358         struct zfcp_port *port;
 359         struct zfcp_unit *unit, *retval = NULL;
 360
 361         list_for_each_entry(port, &adapter->port_list_head, list) {
 362                 if (!port->rport || (id != port->rport->scsi_target_id))
 363                         continue;
 364                 list_for_each_entry(unit, &port->unit_list_head, list) {
 365                         if (lun == unit->scsi_lun) {
 366                                 retval = unit;
 367                                 goto out;
 368                         }
 369                 }
 370         }
 371  out:
 372         return retval;
 373 }
 374
 375 /**
 376  * zfcp_scsi_eh_abort_handler - abort the specified SCSI command
 377  * @scpnt: pointer to scsi_cmnd to be aborted
 378  * Return: SUCCESS - command has been aborted and cleaned up in internal
 379  *          bookkeeping, SCSI stack won't be called for aborted command
 380  *         FAILED - otherwise
 381  *
 382  * We do not need to care for a SCSI command which completes normally
 383  * but late during this abort routine runs.  We are allowed to return
 384  * late commands to the SCSI stack.  It tracks the state of commands and
 385  * will handle late commands.  (Usually, the normal completion of late
 386  * commands is ignored with respect to the running abort operation.)
 387  */
 388 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 389 {
 390         struct Scsi_Host *scsi_host;
 391         struct zfcp_adapter *adapter;
 392         struct zfcp_unit *unit;
 393         struct zfcp_fsf_req *fsf_req;
 394         unsigned long flags;
 395         unsigned long old_req_id;
 396         int retval = SUCCESS;
 397
 398         scsi_host = scpnt->device->host;
 399         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
 400         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 401
 402         ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
 403                       scpnt, zfcp_get_busid_by_adapter(adapter));
 404
 405         /* avoid race condition between late normal completion and abort */
 406         write_lock_irqsave(&adapter->abort_lock, flags);
 407
 408         /* Check whether corresponding fsf_req is still pending */
 409         spin_lock(&adapter->req_list_lock);
 410         fsf_req = zfcp_reqlist_find(adapter,
 411                                     (unsigned long) scpnt->host_scribble);
 412         spin_unlock(&adapter->req_list_lock);
 413         if (!fsf_req) {
 414                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 415                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, 0);
 416                 retval = SUCCESS;
 417                 goto out;
 418         }
 419         fsf_req->data = 0;
 420         fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
 421         old_req_id = fsf_req->req_id;
 422
 423         /* don't access old fsf_req after releasing the abort_lock */
 424         write_unlock_irqrestore(&adapter->abort_lock, flags);
 425
 426         fsf_req = zfcp_fsf_abort_fcp_command(old_req_id, adapter, unit, 0);
 427         if (!fsf_req) {
 428                 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n");
 429                 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
 430                                           old_req_id);
 431                 retval = FAILED;
 432                 goto out;
 433         }
 434
 435         __wait_event(fsf_req->completion_wq,
 436                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 437
 438         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
 439                 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, fsf_req, 0);
 440                 retval = SUCCESS;
 441         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
 442                 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, fsf_req, 0);
 443                 retval = SUCCESS;
 444         } else {
 445                 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, fsf_req, 0);
 446                 retval = FAILED;
 447         }
 448         zfcp_fsf_req_free(fsf_req);
 449  out:
 450         return retval;
 451 }
 452
 453 static int
 454 zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 455 {
 456         int retval;
 457         struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
 458
 459         if (!unit) {
 460                 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
 461                 retval = SUCCESS;
 462                 goto out;
 463         }
 464         ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun);
 465
 466         /*
 467          * If we do not know whether the unit supports 'logical unit reset'
 468          * then try 'logical unit reset' and proceed with 'target reset'
 469          * if 'logical unit reset' fails.
 470          * If the unit is known not to support 'logical unit reset' then
 471          * skip 'logical unit reset' and try 'target reset' immediately.
 472          */
 473         if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 474                               &unit->status)) {
 475                 retval = zfcp_task_management_function(unit,
 476                                                        FCP_LOGICAL_UNIT_RESET,
 477                                                        scpnt);
 478                 if (retval) {
 479                         ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit);
 480                         if (retval == -ENOTSUPP)
 481                                 atomic_set_mask
 482                                     (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 483                                      &unit->status);
 484                         /* fall through and try 'target reset' next */
 485                 } else {
 486                         ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n",
 487                                        unit);
 488                         /* avoid 'target reset' */
 489                         retval = SUCCESS;
 490                         goto out;
 491                 }
 492         }
 493         retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt);
 494         if (retval) {
 495                 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit);
 496                 retval = FAILED;
 497         } else {
 498                 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit);
 499                 retval = SUCCESS;
 500         }
 501  out:
 502         return retval;
 503 }
 504
 505 static int
 506 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags,
 507                               struct scsi_cmnd *scpnt)
 508 {
 509         struct zfcp_adapter *adapter = unit->port->adapter;
 510         struct zfcp_fsf_req *fsf_req;
 511         int retval = 0;
 512
 513         /* issue task management function */
 514         fsf_req = zfcp_fsf_send_fcp_command_task_management
 515                 (adapter, unit, tm_flags, 0);
 516         if (!fsf_req) {
 517                 ZFCP_LOG_INFO("error: creation of task management request "
 518                               "failed for unit 0x%016Lx on port 0x%016Lx on  "
 519                               "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
 520                               zfcp_get_busid_by_adapter(adapter));
 521                 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
 522                 retval = -ENOMEM;
 523                 goto out;
 524         }
 525
 526         __wait_event(fsf_req->completion_wq,
 527                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 528
 529         /*
 530          * check completion status of task management function
 531          */
 532         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 533                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
 534                 retval = -EIO;
 535         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
 536                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
 537                 retval = -ENOTSUPP;
 538         } else
 539                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
 540
 541         zfcp_fsf_req_free(fsf_req);
 542  out:
 543         return retval;
 544 }
 545
 546 /**
 547  * zfcp_scsi_eh_host_reset_handler - handler for host and bus reset
 548  */
 549 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 550 {
 551         struct zfcp_unit *unit;
 552         struct zfcp_adapter *adapter;
 553
 554         unit = (struct zfcp_unit*) scpnt->device->hostdata;
 555         adapter = unit->port->adapter;
 556
 557         ZFCP_LOG_NORMAL("host/bus reset because of problems with "
 558                         "unit 0x%016Lx\n", unit->fcp_lun);
 559
 560         zfcp_erp_adapter_reopen(adapter, 0);
 561         zfcp_erp_wait(adapter);
 562
 563         return SUCCESS;
 564 }
 565
 566 int
 567 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 568 {
 569         int retval = 0;
 570         static unsigned int unique_id = 0;
 571
 572         /* register adapter as SCSI host with mid layer of SCSI stack */
 573         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 574                                              sizeof (struct zfcp_adapter *));
 575         if (!adapter->scsi_host) {
 576                 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
 577                                 "for adapter %s ",
 578                                 zfcp_get_busid_by_adapter(adapter));
 579                 retval = -EIO;
 580                 goto out;
 581         }
 582         ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
 583
 584         /* tell the SCSI stack some characteristics of this adapter */
 585         adapter->scsi_host->max_id = 1;
 586         adapter->scsi_host->max_lun = 1;
 587         adapter->scsi_host->max_channel = 0;
 588         adapter->scsi_host->unique_id = unique_id++;    /* FIXME */
 589         adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
 590         adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
 591
 592         /*
 593          * save a pointer to our own adapter data structure within
 594          * hostdata field of SCSI host data structure
 595          */
 596         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 597
 598         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 599                 scsi_host_put(adapter->scsi_host);
 600                 retval = -EIO;
 601                 goto out;
 602         }
 603         atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 604  out:
 605         return retval;
 606 }
 607
 608 void
 609 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 610 {
 611         struct Scsi_Host *shost;
 612         struct zfcp_port *port;
 613
 614         shost = adapter->scsi_host;
 615         if (!shost)
 616                 return;
 617         read_lock_irq(&zfcp_data.config_lock);
 618         list_for_each_entry(port, &adapter->port_list_head, list)
 619                 if (port->rport)
 620                         port->rport = NULL;
 621         read_unlock_irq(&zfcp_data.config_lock);
 622         fc_remove_host(shost);
 623         scsi_remove_host(shost);
 624         scsi_host_put(shost);
 625         adapter->scsi_host = NULL;
 626         atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 627
 628         return;
 629 }
 630
 631 /*
 632  * Support functions for FC transport class
 633  */
 634 static struct fc_host_statistics*
 635 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 636 {
 637         struct fc_host_statistics *fc_stats;
 638
 639         if (!adapter->fc_stats) {
 640                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 641                 if (!fc_stats)
 642                         return NULL;
 643                 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
 644         }
 645         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 646         return adapter->fc_stats;
 647 }
 648
 649 static void
 650 zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 651                           struct fsf_qtcb_bottom_port *data,
 652                           struct fsf_qtcb_bottom_port *old)
 653 {
 654         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset -
 655                 old->seconds_since_last_reset;
 656         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 657         fc_stats->tx_words = data->tx_words - old->tx_words;
 658         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 659         fc_stats->rx_words = data->rx_words - old->rx_words;
 660         fc_stats->lip_count = data->lip - old->lip;
 661         fc_stats->nos_count = data->nos - old->nos;
 662         fc_stats->error_frames = data->error_frames - old->error_frames;
 663         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 664         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 665         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 666         fc_stats->loss_of_signal_count = data->loss_of_signal -
 667                 old->loss_of_signal;
 668         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts -
 669                 old->psp_error_counts;
 670         fc_stats->invalid_tx_word_count = data->invalid_tx_words -
 671                 old->invalid_tx_words;
 672         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 673         fc_stats->fcp_input_requests = data->input_requests -
 674                 old->input_requests;
 675         fc_stats->fcp_output_requests = data->output_requests -
 676                 old->output_requests;
 677         fc_stats->fcp_control_requests = data->control_requests -
 678                 old->control_requests;
 679         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 680         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 681 }
 682
 683 static void
 684 zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 685                        struct fsf_qtcb_bottom_port *data)
 686 {
 687         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 688         fc_stats->tx_frames = data->tx_frames;
 689         fc_stats->tx_words = data->tx_words;
 690         fc_stats->rx_frames = data->rx_frames;
 691         fc_stats->rx_words = data->rx_words;
 692         fc_stats->lip_count = data->lip;
 693         fc_stats->nos_count = data->nos;
 694         fc_stats->error_frames = data->error_frames;
 695         fc_stats->dumped_frames = data->dumped_frames;
 696         fc_stats->link_failure_count = data->link_failure;
 697         fc_stats->loss_of_sync_count = data->loss_of_sync;
 698         fc_stats->loss_of_signal_count = data->loss_of_signal;
 699         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 700         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 701         fc_stats->invalid_crc_count = data->invalid_crcs;
 702         fc_stats->fcp_input_requests = data->input_requests;
 703         fc_stats->fcp_output_requests = data->output_requests;
 704         fc_stats->fcp_control_requests = data->control_requests;
 705         fc_stats->fcp_input_megabytes = data->input_mb;
 706         fc_stats->fcp_output_megabytes = data->output_mb;
 707 }
 708
 709 /**
 710  * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc
 711  *
 712  * assumption: scsi_transport_fc synchronizes calls of
 713  *             get_fc_host_stats and reset_fc_host_stats
 714  *             (XXX to be checked otherwise introduce locking)
 715  */
 716 static struct fc_host_statistics *
 717 zfcp_get_fc_host_stats(struct Scsi_Host *shost)
 718 {
 719         struct zfcp_adapter *adapter;
 720         struct fc_host_statistics *fc_stats;
 721         struct fsf_qtcb_bottom_port *data;
 722         int ret;
 723
 724         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 725         fc_stats = zfcp_init_fc_host_stats(adapter);
 726         if (!fc_stats)
 727                 return NULL;
 728
 729         data = kzalloc(sizeof(*data), GFP_KERNEL);
 730         if (!data)
 731                 return NULL;
 732
 733         ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
 734         if (ret) {
 735                 kfree(data);
 736                 return NULL; /* XXX return zeroed fc_stats? */
 737         }
 738
 739         if (adapter->stats_reset &&
 740             ((jiffies/HZ - adapter->stats_reset) <
 741              data->seconds_since_last_reset)) {
 742                 zfcp_adjust_fc_host_stats(fc_stats, data,
 743                                           adapter->stats_reset_data);
 744         } else
 745                 zfcp_set_fc_host_stats(fc_stats, data);
 746
 747         kfree(data);
 748         return fc_stats;
 749 }
 750
 751 static void
 752 zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 753 {
 754         struct zfcp_adapter *adapter;
 755         struct fsf_qtcb_bottom_port *data, *old_data;
 756         int ret;
 757
 758         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 759         data = kzalloc(sizeof(*data), GFP_KERNEL);
 760         if (!data)
 761                 return;
 762
 763         ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
 764         if (ret == 0) {
 765                 adapter->stats_reset = jiffies/HZ;
 766                 old_data = adapter->stats_reset_data;
 767                 adapter->stats_reset_data = data; /* finally freed in
 768                                                      adater_dequeue */
 769                 kfree(old_data);
 770         }
 771 }
 772
 773 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 774 {
 775         rport->dev_loss_tmo = timeout;
 776 }
 777
 778 struct fc_function_template zfcp_transport_functions = {
 779         .show_starget_port_id = 1,
 780         .show_starget_port_name = 1,
 781         .show_starget_node_name = 1,
 782         .show_rport_supported_classes = 1,
 783         .show_rport_maxframe_size = 1,
 784         .show_rport_dev_loss_tmo = 1,
 785         .show_host_node_name = 1,
 786         .show_host_port_name = 1,
 787         .show_host_permanent_port_name = 1,
 788         .show_host_supported_classes = 1,
 789         .show_host_supported_speeds = 1,
 790         .show_host_maxframe_size = 1,
 791         .show_host_serial_number = 1,
 792         .get_fc_host_stats = zfcp_get_fc_host_stats,
 793         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 794         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 795         /* no functions registered for following dynamic attributes but
 796            directly set by LLDD */
 797         .show_host_port_type = 1,
 798         .show_host_speed = 1,
 799         .show_host_port_id = 1,
 800 };
 801
 802 /**
 803  * ZFCP_DEFINE_SCSI_ATTR
 804  * @_name:   name of show attribute
 805  * @_format: format string
 806  * @_value:  value to print
 807  *
 808  * Generates attribute for a unit.
 809  */
 810 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)                    \
 811 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr,        \
 812                                               char *buf)                 \
 813 {                                                                        \
 814         struct scsi_device *sdev;                                        \
 815         struct zfcp_unit *unit;                                          \
 816                                                                          \
 817         sdev = to_scsi_device(dev);                                      \
 818         unit = sdev->hostdata;                                           \
 819         return sprintf(buf, _format, _value);                            \
 820 }                                                                        \
 821                                                                          \
 822 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
 823
 824 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
 825 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
 826 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
 827
 828 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
 829         &dev_attr_fcp_lun,
 830         &dev_attr_wwpn,
 831         &dev_attr_hba_id,
 832         NULL
 833 };
 834
 835 #undef ZFCP_LOG_AREA