git.oblomov.eu Git - linux-2.6/blob - drivers/s390/scsi/zfcp_scsi.c

   1 /*
   2  *
   3  * linux/drivers/s390/scsi/zfcp_scsi.c
   4  *
   5  * FCP adapter driver for IBM eServer zSeries
   6  *
   7  * (C) Copyright IBM Corp. 2002, 2004
   8  *
   9  * Author(s): Martin Peschke <mpeschke@de.ibm.com>
  10  *            Raimund Schroeder <raimund.schroeder@de.ibm.com>
  11  *            Aron Zeh
  12  *            Wolfgang Taphorn
  13  *            Stefan Bader <stefan.bader@de.ibm.com>
  14  *            Heiko Carstens <heiko.carstens@de.ibm.com>
  15  *            Andreas Herrmann <aherrman@de.ibm.com>
  16  *
  17  * This program is free software; you can redistribute it and/or modify
  18  * it under the terms of the GNU General Public License as published by
  19  * the Free Software Foundation; either version 2, or (at your option)
  20  * any later version.
  21  *
  22  * This program is distributed in the hope that it will be useful,
  23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  * GNU General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program; if not, write to the Free Software
  29  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  30  */
  31
  32 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_SCSI
  33
  34 #define ZFCP_SCSI_REVISION "$Revision: 1.74 $"
  35
  36 #include "zfcp_ext.h"
  37
  38 static void zfcp_scsi_slave_destroy(struct scsi_device *sdp);
  39 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp);
  40 static int zfcp_scsi_slave_configure(struct scsi_device *sdp);
  41 static int zfcp_scsi_queuecommand(struct scsi_cmnd *,
  42                                   void (*done) (struct scsi_cmnd *));
  43 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *);
  44 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *);
  45 static int zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *);
  46 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *);
  47 static int zfcp_task_management_function(struct zfcp_unit *, u8,
  48                                          struct scsi_cmnd *);
  49
  50 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int, scsi_id_t,
  51                                           scsi_lun_t);
  52 static struct zfcp_port *zfcp_port_lookup(struct zfcp_adapter *, int,
  53                                           scsi_id_t);
  54
  55 static struct device_attribute *zfcp_sysfs_sdev_attrs[];
  56
  57 struct scsi_transport_template *zfcp_transport_template;
  58
  59 struct zfcp_data zfcp_data = {
  60         .scsi_host_template = {
  61               name:                    ZFCP_NAME,
  62               proc_name:               "zfcp",
  63               proc_info:               NULL,
  64               detect:                  NULL,
  65               slave_alloc:             zfcp_scsi_slave_alloc,
  66               slave_configure:         zfcp_scsi_slave_configure,
  67               slave_destroy:           zfcp_scsi_slave_destroy,
  68               queuecommand:            zfcp_scsi_queuecommand,
  69               eh_abort_handler:        zfcp_scsi_eh_abort_handler,
  70               eh_device_reset_handler: zfcp_scsi_eh_device_reset_handler,
  71               eh_bus_reset_handler:    zfcp_scsi_eh_bus_reset_handler,
  72               eh_host_reset_handler:   zfcp_scsi_eh_host_reset_handler,
  73                                        /* FIXME(openfcp): Tune */
  74               can_queue:               4096,
  75               this_id:                 0,
  76               /*
  77                * FIXME:
  78                * one less? can zfcp_create_sbale cope with it?
  79                */
  80               sg_tablesize:            ZFCP_MAX_SBALES_PER_REQ,
  81               cmd_per_lun:             1,
  82               unchecked_isa_dma:       0,
  83               use_clustering:          1,
  84               sdev_attrs:              zfcp_sysfs_sdev_attrs,
  85         },
  86         .driver_version = ZFCP_VERSION,
  87         /* rest initialised with zeros */
  88 };
  89
  90 /* Find start of Response Information in FCP response unit*/
  91 char *
  92 zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  93 {
  94         char *fcp_rsp_info_ptr;
  95
  96         fcp_rsp_info_ptr =
  97             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
  98
  99         return fcp_rsp_info_ptr;
 100 }
 101
 102 /* Find start of Sense Information in FCP response unit*/
 103 char *
 104 zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
 105 {
 106         char *fcp_sns_info_ptr;
 107
 108         fcp_sns_info_ptr =
 109             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
 110         if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
 111                 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr +
 112                     fcp_rsp_iu->fcp_rsp_len;
 113
 114         return fcp_sns_info_ptr;
 115 }
 116
 117 fcp_dl_t *
 118 zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd)
 119 {
 120         int additional_length = fcp_cmd->add_fcp_cdb_length << 2;
 121         fcp_dl_t *fcp_dl_addr;
 122
 123         fcp_dl_addr = (fcp_dl_t *)
 124                 ((unsigned char *) fcp_cmd +
 125                  sizeof (struct fcp_cmnd_iu) + additional_length);
 126         /*
 127          * fcp_dl_addr = start address of fcp_cmnd structure +
 128          * size of fixed part + size of dynamically sized add_dcp_cdb field
 129          * SEE FCP-2 documentation
 130          */
 131         return fcp_dl_addr;
 132 }
 133
 134 fcp_dl_t
 135 zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd)
 136 {
 137         return *zfcp_get_fcp_dl_ptr(fcp_cmd);
 138 }
 139
 140 void
 141 zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
 142 {
 143         *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl;
 144 }
 145
 146 /*
 147  * note: it's a bit-or operation not an assignment
 148  * regarding the specified byte
 149  */
 150 static inline void
 151 set_byte(u32 * result, char status, char pos)
 152 {
 153         *result |= status << (pos * 8);
 154 }
 155
 156 void
 157 set_host_byte(u32 * result, char status)
 158 {
 159         set_byte(result, status, 2);
 160 }
 161
 162 void
 163 set_driver_byte(u32 * result, char status)
 164 {
 165         set_byte(result, status, 3);
 166 }
 167
 168 /*
 169  * function:    zfcp_scsi_slave_alloc
 170  *
 171  * purpose:
 172  *
 173  * returns:
 174  */
 175
 176 static int
 177 zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 178 {
 179         struct zfcp_adapter *adapter;
 180         struct zfcp_unit *unit;
 181         unsigned long flags;
 182         int retval = -ENODEV;
 183
 184         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 185         if (!adapter)
 186                 goto out;
 187
 188         read_lock_irqsave(&zfcp_data.config_lock, flags);
 189         unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
 190         if (unit) {
 191                 sdp->hostdata = unit;
 192                 unit->device = sdp;
 193                 zfcp_unit_get(unit);
 194                 retval = 0;
 195         }
 196         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 197  out:
 198         return retval;
 199 }
 200
 201 /*
 202  * function:    zfcp_scsi_slave_destroy
 203  *
 204  * purpose:
 205  *
 206  * returns:
 207  */
 208
 209 static void
 210 zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
 211 {
 212         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
 213
 214         if (unit) {
 215                 sdpnt->hostdata = NULL;
 216                 unit->device = NULL;
 217                 zfcp_unit_put(unit);
 218         } else {
 219                 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at "
 220                                 "address %p\n", sdpnt);
 221         }
 222 }
 223
 224 /*
 225  * called from scsi midlayer to allow finetuning of a device.
 226  */
 227 static int
 228 zfcp_scsi_slave_configure(struct scsi_device *sdp)
 229 {
 230         if (sdp->tagged_supported)
 231                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN);
 232         else
 233                 scsi_adjust_queue_depth(sdp, 0, 1);
 234         return 0;
 235 }
 236
 237 /**
 238  * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function
 239  * @scpnt: pointer to struct scsi_cmnd where result is set
 240  * @result: result to be set in scpnt (e.g. DID_ERROR)
 241  */
 242 static void
 243 zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
 244 {
 245         set_host_byte(&scpnt->result, result);
 246         if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
 247                 zfcp_scsi_dbf_event_result("fail", 4,
 248                         (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
 249                         scpnt);
 250         /* return directly */
 251         scpnt->scsi_done(scpnt);
 252 }
 253
 254 /**
 255  * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and
 256  *      zfcp_scsi_command_sync
 257  * @adapter: adapter where scsi command is issued
 258  * @unit: unit to which scsi command is sent
 259  * @scpnt: scsi command to be sent
 260  * @timer: timer to be started if request is successfully initiated
 261  *
 262  * Note: In scsi_done function must be set in scpnt.
 263  */
 264 int
 265 zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit,
 266                         struct scsi_cmnd *scpnt, struct timer_list *timer)
 267 {
 268         int tmp;
 269         int retval;
 270
 271         retval = 0;
 272
 273         BUG_ON((adapter == NULL) || (adapter != unit->port->adapter));
 274         BUG_ON(scpnt->scsi_done == NULL);
 275
 276         if (unlikely(NULL == unit)) {
 277                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
 278                 goto out;
 279         }
 280
 281         if (unlikely(
 282               atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) ||
 283              !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) {
 284                 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port "
 285                                "0x%016Lx on adapter %s\n",
 286                                unit->fcp_lun, unit->port->wwpn,
 287                                zfcp_get_busid_by_adapter(adapter));
 288                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 289                 goto out;
 290         }
 291
 292         if (unlikely(
 293              !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) {
 294                 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx "
 295                                "on port 0x%016Lx in recovery\n",
 296                                zfcp_get_busid_by_unit(unit),
 297                                unit->fcp_lun, unit->port->wwpn);
 298                 retval = SCSI_MLQUEUE_DEVICE_BUSY;
 299                 goto out;
 300         }
 301
 302         tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, timer,
 303                                              ZFCP_REQ_AUTO_CLEANUP);
 304
 305         if (unlikely(tmp < 0)) {
 306                 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n");
 307                 retval = SCSI_MLQUEUE_HOST_BUSY;
 308         }
 309
 310 out:
 311         return retval;
 312 }
 313
 314 void
 315 zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt)
 316 {
 317         struct completion *wait = (struct completion *) scpnt->SCp.ptr;
 318         complete(wait);
 319 }
 320
 321
 322 /**
 323  * zfcp_scsi_command_sync - send a SCSI command and wait for completion
 324  * @unit: unit where command is sent to
 325  * @scpnt: scsi command to be sent
 326  * @timer: timer to be started if request is successfully initiated
 327  * Return: 0
 328  *
 329  * Errors are indicated in scpnt->result
 330  */
 331 int
 332 zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt,
 333                        struct timer_list *timer)
 334 {
 335         int ret;
 336         DECLARE_COMPLETION(wait);
 337
 338         scpnt->SCp.ptr = (void *) &wait;  /* silent re-use */
 339         scpnt->scsi_done = zfcp_scsi_command_sync_handler;
 340         ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, timer);
 341         if (ret == 0)
 342                 wait_for_completion(&wait);
 343
 344         scpnt->SCp.ptr = NULL;
 345
 346         return 0;
 347 }
 348
 349 /*
 350  * function:    zfcp_scsi_queuecommand
 351  *
 352  * purpose:     enqueues a SCSI command to the specified target device
 353  *
 354  * returns:     0 - success, SCSI command enqueued
 355  *              !0 - failure
 356  */
 357 int
 358 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
 359                        void (*done) (struct scsi_cmnd *))
 360 {
 361         struct zfcp_unit *unit;
 362         struct zfcp_adapter *adapter;
 363
 364         /* reset the status for this request */
 365         scpnt->result = 0;
 366         scpnt->host_scribble = NULL;
 367         scpnt->scsi_done = done;
 368
 369         /*
 370          * figure out adapter and target device
 371          * (stored there by zfcp_scsi_slave_alloc)
 372          */
 373         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
 374         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 375
 376         return zfcp_scsi_command_async(adapter, unit, scpnt, NULL);
 377 }
 378
 379 /*
 380  * function:    zfcp_unit_lookup
 381  *
 382  * purpose:
 383  *
 384  * returns:
 385  *
 386  * context:
 387  */
 388 static struct zfcp_unit *
 389 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id,
 390                  scsi_lun_t lun)
 391 {
 392         struct zfcp_port *port;
 393         struct zfcp_unit *unit, *retval = NULL;
 394
 395         list_for_each_entry(port, &adapter->port_list_head, list) {
 396                 if (!port->rport || (id != port->rport->scsi_target_id))
 397                         continue;
 398                 list_for_each_entry(unit, &port->unit_list_head, list) {
 399                         if (lun == unit->scsi_lun) {
 400                                 retval = unit;
 401                                 goto out;
 402                         }
 403                 }
 404         }
 405  out:
 406         return retval;
 407 }
 408
 409 static struct zfcp_port *
 410 zfcp_port_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id)
 411 {
 412         struct zfcp_port *port;
 413
 414         list_for_each_entry(port, &adapter->port_list_head, list) {
 415                 if (port->rport && (id == port->rport->scsi_target_id))
 416                         return port;
 417         }
 418         return (struct zfcp_port *) NULL;
 419 }
 420
 421 /**
 422  * zfcp_scsi_eh_abort_handler - abort the specified SCSI command
 423  * @scpnt: pointer to scsi_cmnd to be aborted
 424  * Return: SUCCESS - command has been aborted and cleaned up in internal
 425  *          bookkeeping, SCSI stack won't be called for aborted command
 426  *         FAILED - otherwise
 427  *
 428  * We do not need to care for a SCSI command which completes normally
 429  * but late during this abort routine runs.  We are allowed to return
 430  * late commands to the SCSI stack.  It tracks the state of commands and
 431  * will handle late commands.  (Usually, the normal completion of late
 432  * commands is ignored with respect to the running abort operation.)
 433  */
 434 int
 435 zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 436 {
 437         struct Scsi_Host *scsi_host;
 438         struct zfcp_adapter *adapter;
 439         struct zfcp_unit *unit;
 440         int retval = SUCCESS;
 441         struct zfcp_fsf_req *new_fsf_req = NULL;
 442         struct zfcp_fsf_req *old_fsf_req;
 443         unsigned long flags;
 444
 445         scsi_host = scpnt->device->host;
 446         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
 447         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 448
 449         ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
 450                       scpnt, zfcp_get_busid_by_adapter(adapter));
 451
 452         /* avoid race condition between late normal completion and abort */
 453         write_lock_irqsave(&adapter->abort_lock, flags);
 454
 455         /*
 456          * Check whether command has just completed and can not be aborted.
 457          * Even if the command has just been completed late, we can access
 458          * scpnt since the SCSI stack does not release it at least until
 459          * this routine returns. (scpnt is parameter passed to this routine
 460          * and must not disappear during abort even on late completion.)
 461          */
 462         old_fsf_req = (struct zfcp_fsf_req *) scpnt->host_scribble;
 463         if (!old_fsf_req) {
 464                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 465                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, new_fsf_req);
 466                 retval = SUCCESS;
 467                 goto out;
 468         }
 469         old_fsf_req->data = 0;
 470         old_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
 471
 472         /* don't access old_fsf_req after releasing the abort_lock */
 473         write_unlock_irqrestore(&adapter->abort_lock, flags);
 474         /* call FSF routine which does the abort */
 475         new_fsf_req = zfcp_fsf_abort_fcp_command((unsigned long) old_fsf_req,
 476                                                  adapter, unit, 0);
 477         if (!new_fsf_req) {
 478                 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n");
 479                 retval = FAILED;
 480                 goto out;
 481         }
 482
 483         /* wait for completion of abort */
 484         __wait_event(new_fsf_req->completion_wq,
 485                      new_fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 486
 487         /* status should be valid since signals were not permitted */
 488         if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
 489                 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, new_fsf_req);
 490                 retval = SUCCESS;
 491         } else if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
 492                 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, new_fsf_req);
 493                 retval = SUCCESS;
 494         } else {
 495                 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, new_fsf_req);
 496                 retval = FAILED;
 497         }
 498         zfcp_fsf_req_free(new_fsf_req);
 499  out:
 500         return retval;
 501 }
 502
 503 /*
 504  * function:    zfcp_scsi_eh_device_reset_handler
 505  *
 506  * purpose:
 507  *
 508  * returns:
 509  */
 510 int
 511 zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 512 {
 513         int retval;
 514         struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
 515
 516         if (!unit) {
 517                 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
 518                 retval = SUCCESS;
 519                 goto out;
 520         }
 521         ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun);
 522
 523         /*
 524          * If we do not know whether the unit supports 'logical unit reset'
 525          * then try 'logical unit reset' and proceed with 'target reset'
 526          * if 'logical unit reset' fails.
 527          * If the unit is known not to support 'logical unit reset' then
 528          * skip 'logical unit reset' and try 'target reset' immediately.
 529          */
 530         if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 531                               &unit->status)) {
 532                 retval = zfcp_task_management_function(unit,
 533                                                        FCP_LOGICAL_UNIT_RESET,
 534                                                        scpnt);
 535                 if (retval) {
 536                         ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit);
 537                         if (retval == -ENOTSUPP)
 538                                 atomic_set_mask
 539                                     (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 540                                      &unit->status);
 541                         /* fall through and try 'target reset' next */
 542                 } else {
 543                         ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n",
 544                                        unit);
 545                         /* avoid 'target reset' */
 546                         retval = SUCCESS;
 547                         goto out;
 548                 }
 549         }
 550         retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt);
 551         if (retval) {
 552                 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit);
 553                 retval = FAILED;
 554         } else {
 555                 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit);
 556                 retval = SUCCESS;
 557         }
 558  out:
 559         return retval;
 560 }
 561
 562 static int
 563 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags,
 564                               struct scsi_cmnd *scpnt)
 565 {
 566         struct zfcp_adapter *adapter = unit->port->adapter;
 567         struct zfcp_fsf_req *fsf_req;
 568         int retval = 0;
 569
 570         /* issue task management function */
 571         fsf_req = zfcp_fsf_send_fcp_command_task_management
 572                 (adapter, unit, tm_flags, 0);
 573         if (!fsf_req) {
 574                 ZFCP_LOG_INFO("error: creation of task management request "
 575                               "failed for unit 0x%016Lx on port 0x%016Lx on  "
 576                               "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
 577                               zfcp_get_busid_by_adapter(adapter));
 578                 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
 579                 retval = -ENOMEM;
 580                 goto out;
 581         }
 582
 583         __wait_event(fsf_req->completion_wq,
 584                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 585
 586         /*
 587          * check completion status of task management function
 588          */
 589         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 590                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
 591                 retval = -EIO;
 592         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
 593                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
 594                 retval = -ENOTSUPP;
 595         } else
 596                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
 597
 598         zfcp_fsf_req_free(fsf_req);
 599  out:
 600         return retval;
 601 }
 602
 603 /**
 604  * zfcp_scsi_eh_bus_reset_handler - reset bus (reopen adapter)
 605  */
 606 int
 607 zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *scpnt)
 608 {
 609         struct zfcp_unit *unit = (struct zfcp_unit*) scpnt->device->hostdata;
 610         struct zfcp_adapter *adapter = unit->port->adapter;
 611
 612         ZFCP_LOG_NORMAL("bus reset because of problems with "
 613                         "unit 0x%016Lx\n", unit->fcp_lun);
 614         zfcp_erp_adapter_reopen(adapter, 0);
 615         zfcp_erp_wait(adapter);
 616
 617         return SUCCESS;
 618 }
 619
 620 /**
 621  * zfcp_scsi_eh_host_reset_handler - reset host (reopen adapter)
 622  */
 623 int
 624 zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 625 {
 626         struct zfcp_unit *unit = (struct zfcp_unit*) scpnt->device->hostdata;
 627         struct zfcp_adapter *adapter = unit->port->adapter;
 628
 629         ZFCP_LOG_NORMAL("host reset because of problems with "
 630                         "unit 0x%016Lx\n", unit->fcp_lun);
 631         zfcp_erp_adapter_reopen(adapter, 0);
 632         zfcp_erp_wait(adapter);
 633
 634         return SUCCESS;
 635 }
 636
 637 /*
 638  * function:
 639  *
 640  * purpose:
 641  *
 642  * returns:
 643  */
 644 int
 645 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 646 {
 647         int retval = 0;
 648         static unsigned int unique_id = 0;
 649
 650         /* register adapter as SCSI host with mid layer of SCSI stack */
 651         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 652                                              sizeof (struct zfcp_adapter *));
 653         if (!adapter->scsi_host) {
 654                 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
 655                                 "for adapter %s ",
 656                                 zfcp_get_busid_by_adapter(adapter));
 657                 retval = -EIO;
 658                 goto out;
 659         }
 660         ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
 661
 662         /* tell the SCSI stack some characteristics of this adapter */
 663         adapter->scsi_host->max_id = 1;
 664         adapter->scsi_host->max_lun = 1;
 665         adapter->scsi_host->max_channel = 0;
 666         adapter->scsi_host->unique_id = unique_id++;    /* FIXME */
 667         adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
 668         adapter->scsi_host->transportt = zfcp_transport_template;
 669         /*
 670          * Reverse mapping of the host number to avoid race condition
 671          */
 672         adapter->scsi_host_no = adapter->scsi_host->host_no;
 673
 674         /*
 675          * save a pointer to our own adapter data structure within
 676          * hostdata field of SCSI host data structure
 677          */
 678         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 679
 680         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 681                 scsi_host_put(adapter->scsi_host);
 682                 retval = -EIO;
 683                 goto out;
 684         }
 685         atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 686  out:
 687         return retval;
 688 }
 689
 690 /*
 691  * function:
 692  *
 693  * purpose:
 694  *
 695  * returns:
 696  */
 697 void
 698 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 699 {
 700         struct Scsi_Host *shost;
 701         struct zfcp_port *port;
 702
 703         shost = adapter->scsi_host;
 704         if (!shost)
 705                 return;
 706         read_lock_irq(&zfcp_data.config_lock);
 707         list_for_each_entry(port, &adapter->port_list_head, list)
 708                 if (port->rport)
 709                         port->rport = NULL;
 710         read_unlock_irq(&zfcp_data.config_lock);
 711         fc_remove_host(shost);
 712         scsi_remove_host(shost);
 713         scsi_host_put(shost);
 714         adapter->scsi_host = NULL;
 715         adapter->scsi_host_no = 0;
 716         atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 717
 718         return;
 719 }
 720
 721
 722 void
 723 zfcp_fsf_start_scsi_er_timer(struct zfcp_adapter *adapter)
 724 {
 725         adapter->scsi_er_timer.function = zfcp_fsf_scsi_er_timeout_handler;
 726         adapter->scsi_er_timer.data = (unsigned long) adapter;
 727         adapter->scsi_er_timer.expires = jiffies + ZFCP_SCSI_ER_TIMEOUT;
 728         add_timer(&adapter->scsi_er_timer);
 729 }
 730
 731 /*
 732  * Support functions for FC transport class
 733  */
 734 static void
 735 zfcp_get_port_id(struct scsi_target *starget)
 736 {
 737         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 738         struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0];
 739         struct zfcp_port *port;
 740         unsigned long flags;
 741
 742         read_lock_irqsave(&zfcp_data.config_lock, flags);
 743         port = zfcp_port_lookup(adapter, starget->channel, starget->id);
 744         if (port)
 745                 fc_starget_port_id(starget) = port->d_id;
 746         else
 747                 fc_starget_port_id(starget) = -1;
 748         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 749 }
 750
 751 static void
 752 zfcp_get_port_name(struct scsi_target *starget)
 753 {
 754         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 755         struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0];
 756         struct zfcp_port *port;
 757         unsigned long flags;
 758
 759         read_lock_irqsave(&zfcp_data.config_lock, flags);
 760         port = zfcp_port_lookup(adapter, starget->channel, starget->id);
 761         if (port)
 762                 fc_starget_port_name(starget) = port->wwpn;
 763         else
 764                 fc_starget_port_name(starget) = -1;
 765         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 766 }
 767
 768 static void
 769 zfcp_get_node_name(struct scsi_target *starget)
 770 {
 771         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 772         struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0];
 773         struct zfcp_port *port;
 774         unsigned long flags;
 775
 776         read_lock_irqsave(&zfcp_data.config_lock, flags);
 777         port = zfcp_port_lookup(adapter, starget->channel, starget->id);
 778         if (port)
 779                 fc_starget_node_name(starget) = port->wwnn;
 780         else
 781                 fc_starget_node_name(starget) = -1;
 782         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 783 }
 784
 785 struct fc_function_template zfcp_transport_functions = {
 786         .get_starget_port_id = zfcp_get_port_id,
 787         .get_starget_port_name = zfcp_get_port_name,
 788         .get_starget_node_name = zfcp_get_node_name,
 789         .show_starget_port_id = 1,
 790         .show_starget_port_name = 1,
 791         .show_starget_node_name = 1,
 792         .show_rport_supported_classes = 1,
 793         .show_host_node_name = 1,
 794         .show_host_port_name = 1,
 795         .show_host_supported_classes = 1,
 796         .show_host_maxframe_size = 1,
 797         .show_host_serial_number = 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