SAFE public projects git trees. - safe/jmp/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 #include "zfcp_ext.h"
  35
  36 static void zfcp_scsi_slave_destroy(struct scsi_device *sdp);
  37 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp);
  38 static int zfcp_scsi_slave_configure(struct scsi_device *sdp);
  39 static int zfcp_scsi_queuecommand(struct scsi_cmnd *,
  40                                   void (*done) (struct scsi_cmnd *));
  41 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *);
  42 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *);
  43 static int zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *);
  44 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *);
  45 static int zfcp_task_management_function(struct zfcp_unit *, u8,
  46                                          struct scsi_cmnd *);
  47
  48 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int, scsi_id_t,
  49                                           scsi_lun_t);
  50
  51 static struct device_attribute *zfcp_sysfs_sdev_attrs[];
  52
  53 struct scsi_transport_template *zfcp_transport_template;
  54
  55 struct zfcp_data zfcp_data = {
  56         .scsi_host_template = {
  57               name:                    ZFCP_NAME,
  58               proc_name:               "zfcp",
  59               proc_info:               NULL,
  60               detect:                  NULL,
  61               slave_alloc:             zfcp_scsi_slave_alloc,
  62               slave_configure:         zfcp_scsi_slave_configure,
  63               slave_destroy:           zfcp_scsi_slave_destroy,
  64               queuecommand:            zfcp_scsi_queuecommand,
  65               eh_abort_handler:        zfcp_scsi_eh_abort_handler,
  66               eh_device_reset_handler: zfcp_scsi_eh_device_reset_handler,
  67               eh_bus_reset_handler:    zfcp_scsi_eh_bus_reset_handler,
  68               eh_host_reset_handler:   zfcp_scsi_eh_host_reset_handler,
  69                                        /* FIXME(openfcp): Tune */
  70               can_queue:               4096,
  71               this_id:                 0,
  72               /*
  73                * FIXME:
  74                * one less? can zfcp_create_sbale cope with it?
  75                */
  76               sg_tablesize:            ZFCP_MAX_SBALES_PER_REQ,
  77               cmd_per_lun:             1,
  78               unchecked_isa_dma:       0,
  79               use_clustering:          1,
  80               sdev_attrs:              zfcp_sysfs_sdev_attrs,
  81         },
  82         .driver_version = ZFCP_VERSION,
  83         /* rest initialised with zeros */
  84 };
  85
  86 /* Find start of Response Information in FCP response unit*/
  87 char *
  88 zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  89 {
  90         char *fcp_rsp_info_ptr;
  91
  92         fcp_rsp_info_ptr =
  93             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
  94
  95         return fcp_rsp_info_ptr;
  96 }
  97
  98 /* Find start of Sense Information in FCP response unit*/
  99 char *
 100 zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
 101 {
 102         char *fcp_sns_info_ptr;
 103
 104         fcp_sns_info_ptr =
 105             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
 106         if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
 107                 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr +
 108                     fcp_rsp_iu->fcp_rsp_len;
 109
 110         return fcp_sns_info_ptr;
 111 }
 112
 113 fcp_dl_t *
 114 zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd)
 115 {
 116         int additional_length = fcp_cmd->add_fcp_cdb_length << 2;
 117         fcp_dl_t *fcp_dl_addr;
 118
 119         fcp_dl_addr = (fcp_dl_t *)
 120                 ((unsigned char *) fcp_cmd +
 121                  sizeof (struct fcp_cmnd_iu) + additional_length);
 122         /*
 123          * fcp_dl_addr = start address of fcp_cmnd structure +
 124          * size of fixed part + size of dynamically sized add_dcp_cdb field
 125          * SEE FCP-2 documentation
 126          */
 127         return fcp_dl_addr;
 128 }
 129
 130 fcp_dl_t
 131 zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd)
 132 {
 133         return *zfcp_get_fcp_dl_ptr(fcp_cmd);
 134 }
 135
 136 void
 137 zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
 138 {
 139         *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl;
 140 }
 141
 142 /*
 143  * note: it's a bit-or operation not an assignment
 144  * regarding the specified byte
 145  */
 146 static inline void
 147 set_byte(u32 * result, char status, char pos)
 148 {
 149         *result |= status << (pos * 8);
 150 }
 151
 152 void
 153 set_host_byte(u32 * result, char status)
 154 {
 155         set_byte(result, status, 2);
 156 }
 157
 158 void
 159 set_driver_byte(u32 * result, char status)
 160 {
 161         set_byte(result, status, 3);
 162 }
 163
 164 /*
 165  * function:    zfcp_scsi_slave_alloc
 166  *
 167  * purpose:
 168  *
 169  * returns:
 170  */
 171
 172 static int
 173 zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 174 {
 175         struct zfcp_adapter *adapter;
 176         struct zfcp_unit *unit;
 177         unsigned long flags;
 178         int retval = -ENXIO;
 179
 180         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 181         if (!adapter)
 182                 goto out;
 183
 184         read_lock_irqsave(&zfcp_data.config_lock, flags);
 185         unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
 186         if (unit) {
 187                 sdp->hostdata = unit;
 188                 unit->device = sdp;
 189                 zfcp_unit_get(unit);
 190                 retval = 0;
 191         }
 192         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 193  out:
 194         return retval;
 195 }
 196
 197 /*
 198  * function:    zfcp_scsi_slave_destroy
 199  *
 200  * purpose:
 201  *
 202  * returns:
 203  */
 204
 205 static void
 206 zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
 207 {
 208         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
 209
 210         if (unit) {
 211                 sdpnt->hostdata = NULL;
 212                 unit->device = NULL;
 213                 zfcp_unit_put(unit);
 214         } else {
 215                 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at "
 216                                 "address %p\n", sdpnt);
 217         }
 218 }
 219
 220 /*
 221  * called from scsi midlayer to allow finetuning of a device.
 222  */
 223 static int
 224 zfcp_scsi_slave_configure(struct scsi_device *sdp)
 225 {
 226         if (sdp->tagged_supported)
 227                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN);
 228         else
 229                 scsi_adjust_queue_depth(sdp, 0, 1);
 230         return 0;
 231 }
 232
 233 /**
 234  * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function
 235  * @scpnt: pointer to struct scsi_cmnd where result is set
 236  * @result: result to be set in scpnt (e.g. DID_ERROR)
 237  */
 238 static void
 239 zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
 240 {
 241         set_host_byte(&scpnt->result, result);
 242         if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
 243                 zfcp_scsi_dbf_event_result("fail", 4,
 244                         (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
 245                         scpnt);
 246         /* return directly */
 247         scpnt->scsi_done(scpnt);
 248 }
 249
 250 /**
 251  * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and
 252  *      zfcp_scsi_command_sync
 253  * @adapter: adapter where scsi command is issued
 254  * @unit: unit to which scsi command is sent
 255  * @scpnt: scsi command to be sent
 256  * @timer: timer to be started if request is successfully initiated
 257  *
 258  * Note: In scsi_done function must be set in scpnt.
 259  */
 260 int
 261 zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit,
 262                         struct scsi_cmnd *scpnt, struct timer_list *timer)
 263 {
 264         int tmp;
 265         int retval;
 266
 267         retval = 0;
 268
 269         BUG_ON((adapter == NULL) || (adapter != unit->port->adapter));
 270         BUG_ON(scpnt->scsi_done == NULL);
 271
 272         if (unlikely(NULL == unit)) {
 273                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
 274                 goto out;
 275         }
 276
 277         if (unlikely(
 278               atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) ||
 279              !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) {
 280                 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port "
 281                                "0x%016Lx on adapter %s\n",
 282                                unit->fcp_lun, unit->port->wwpn,
 283                                zfcp_get_busid_by_adapter(adapter));
 284                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 285                 goto out;
 286         }
 287
 288         if (unlikely(
 289              !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) {
 290                 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx "
 291                                "on port 0x%016Lx in recovery\n",
 292                                zfcp_get_busid_by_unit(unit),
 293                                unit->fcp_lun, unit->port->wwpn);
 294                 retval = SCSI_MLQUEUE_DEVICE_BUSY;
 295                 goto out;
 296         }
 297
 298         tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, timer,
 299                                              ZFCP_REQ_AUTO_CLEANUP);
 300
 301         if (unlikely(tmp < 0)) {
 302                 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n");
 303                 retval = SCSI_MLQUEUE_HOST_BUSY;
 304         }
 305
 306 out:
 307         return retval;
 308 }
 309
 310 void
 311 zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt)
 312 {
 313         struct completion *wait = (struct completion *) scpnt->SCp.ptr;
 314         complete(wait);
 315 }
 316
 317
 318 /**
 319  * zfcp_scsi_command_sync - send a SCSI command and wait for completion
 320  * @unit: unit where command is sent to
 321  * @scpnt: scsi command to be sent
 322  * @timer: timer to be started if request is successfully initiated
 323  * Return: 0
 324  *
 325  * Errors are indicated in scpnt->result
 326  */
 327 int
 328 zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt,
 329                        struct timer_list *timer)
 330 {
 331         int ret;
 332         DECLARE_COMPLETION(wait);
 333
 334         scpnt->SCp.ptr = (void *) &wait;  /* silent re-use */
 335         scpnt->scsi_done = zfcp_scsi_command_sync_handler;
 336         ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, timer);
 337         if (ret == 0)
 338                 wait_for_completion(&wait);
 339
 340         scpnt->SCp.ptr = NULL;
 341
 342         return 0;
 343 }
 344
 345 /*
 346  * function:    zfcp_scsi_queuecommand
 347  *
 348  * purpose:     enqueues a SCSI command to the specified target device
 349  *
 350  * returns:     0 - success, SCSI command enqueued
 351  *              !0 - failure
 352  */
 353 int
 354 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
 355                        void (*done) (struct scsi_cmnd *))
 356 {
 357         struct zfcp_unit *unit;
 358         struct zfcp_adapter *adapter;
 359
 360         /* reset the status for this request */
 361         scpnt->result = 0;
 362         scpnt->host_scribble = NULL;
 363         scpnt->scsi_done = done;
 364
 365         /*
 366          * figure out adapter and target device
 367          * (stored there by zfcp_scsi_slave_alloc)
 368          */
 369         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
 370         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 371
 372         return zfcp_scsi_command_async(adapter, unit, scpnt, NULL);
 373 }
 374
 375 /*
 376  * function:    zfcp_unit_lookup
 377  *
 378  * purpose:
 379  *
 380  * returns:
 381  *
 382  * context:
 383  */
 384 static struct zfcp_unit *
 385 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id,
 386                  scsi_lun_t lun)
 387 {
 388         struct zfcp_port *port;
 389         struct zfcp_unit *unit, *retval = NULL;
 390
 391         list_for_each_entry(port, &adapter->port_list_head, list) {
 392                 if (!port->rport || (id != port->rport->scsi_target_id))
 393                         continue;
 394                 list_for_each_entry(unit, &port->unit_list_head, list) {
 395                         if (lun == unit->scsi_lun) {
 396                                 retval = unit;
 397                                 goto out;
 398                         }
 399                 }
 400         }
 401  out:
 402         return retval;
 403 }
 404
 405 /**
 406  * zfcp_scsi_eh_abort_handler - abort the specified SCSI command
 407  * @scpnt: pointer to scsi_cmnd to be aborted
 408  * Return: SUCCESS - command has been aborted and cleaned up in internal
 409  *          bookkeeping, SCSI stack won't be called for aborted command
 410  *         FAILED - otherwise
 411  *
 412  * We do not need to care for a SCSI command which completes normally
 413  * but late during this abort routine runs.  We are allowed to return
 414  * late commands to the SCSI stack.  It tracks the state of commands and
 415  * will handle late commands.  (Usually, the normal completion of late
 416  * commands is ignored with respect to the running abort operation.)
 417  */
 418 int
 419 zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 420 {
 421         struct Scsi_Host *scsi_host;
 422         struct zfcp_adapter *adapter;
 423         struct zfcp_unit *unit;
 424         int retval = SUCCESS;
 425         struct zfcp_fsf_req *new_fsf_req = NULL;
 426         struct zfcp_fsf_req *old_fsf_req;
 427         unsigned long flags;
 428
 429         scsi_host = scpnt->device->host;
 430         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
 431         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 432
 433         ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
 434                       scpnt, zfcp_get_busid_by_adapter(adapter));
 435
 436         /* avoid race condition between late normal completion and abort */
 437         write_lock_irqsave(&adapter->abort_lock, flags);
 438
 439         /*
 440          * Check whether command has just completed and can not be aborted.
 441          * Even if the command has just been completed late, we can access
 442          * scpnt since the SCSI stack does not release it at least until
 443          * this routine returns. (scpnt is parameter passed to this routine
 444          * and must not disappear during abort even on late completion.)
 445          */
 446         old_fsf_req = (struct zfcp_fsf_req *) scpnt->host_scribble;
 447         if (!old_fsf_req) {
 448                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 449                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, new_fsf_req);
 450                 retval = SUCCESS;
 451                 goto out;
 452         }
 453         old_fsf_req->data = 0;
 454         old_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
 455
 456         /* don't access old_fsf_req after releasing the abort_lock */
 457         write_unlock_irqrestore(&adapter->abort_lock, flags);
 458         /* call FSF routine which does the abort */
 459         new_fsf_req = zfcp_fsf_abort_fcp_command((unsigned long) old_fsf_req,
 460                                                  adapter, unit, 0);
 461         if (!new_fsf_req) {
 462                 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n");
 463                 retval = FAILED;
 464                 goto out;
 465         }
 466
 467         /* wait for completion of abort */
 468         __wait_event(new_fsf_req->completion_wq,
 469                      new_fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 470
 471         /* status should be valid since signals were not permitted */
 472         if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
 473                 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, new_fsf_req);
 474                 retval = SUCCESS;
 475         } else if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
 476                 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, new_fsf_req);
 477                 retval = SUCCESS;
 478         } else {
 479                 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, new_fsf_req);
 480                 retval = FAILED;
 481         }
 482         zfcp_fsf_req_free(new_fsf_req);
 483  out:
 484         return retval;
 485 }
 486
 487 /*
 488  * function:    zfcp_scsi_eh_device_reset_handler
 489  *
 490  * purpose:
 491  *
 492  * returns:
 493  */
 494 int
 495 zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 496 {
 497         int retval;
 498         struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
 499
 500         if (!unit) {
 501                 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
 502                 retval = SUCCESS;
 503                 goto out;
 504         }
 505         ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun);
 506
 507         /*
 508          * If we do not know whether the unit supports 'logical unit reset'
 509          * then try 'logical unit reset' and proceed with 'target reset'
 510          * if 'logical unit reset' fails.
 511          * If the unit is known not to support 'logical unit reset' then
 512          * skip 'logical unit reset' and try 'target reset' immediately.
 513          */
 514         if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 515                               &unit->status)) {
 516                 retval = zfcp_task_management_function(unit,
 517                                                        FCP_LOGICAL_UNIT_RESET,
 518                                                        scpnt);
 519                 if (retval) {
 520                         ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit);
 521                         if (retval == -ENOTSUPP)
 522                                 atomic_set_mask
 523                                     (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 524                                      &unit->status);
 525                         /* fall through and try 'target reset' next */
 526                 } else {
 527                         ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n",
 528                                        unit);
 529                         /* avoid 'target reset' */
 530                         retval = SUCCESS;
 531                         goto out;
 532                 }
 533         }
 534         retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt);
 535         if (retval) {
 536                 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit);
 537                 retval = FAILED;
 538         } else {
 539                 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit);
 540                 retval = SUCCESS;
 541         }
 542  out:
 543         return retval;
 544 }
 545
 546 static int
 547 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags,
 548                               struct scsi_cmnd *scpnt)
 549 {
 550         struct zfcp_adapter *adapter = unit->port->adapter;
 551         struct zfcp_fsf_req *fsf_req;
 552         int retval = 0;
 553
 554         /* issue task management function */
 555         fsf_req = zfcp_fsf_send_fcp_command_task_management
 556                 (adapter, unit, tm_flags, 0);
 557         if (!fsf_req) {
 558                 ZFCP_LOG_INFO("error: creation of task management request "
 559                               "failed for unit 0x%016Lx on port 0x%016Lx on  "
 560                               "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
 561                               zfcp_get_busid_by_adapter(adapter));
 562                 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
 563                 retval = -ENOMEM;
 564                 goto out;
 565         }
 566
 567         __wait_event(fsf_req->completion_wq,
 568                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 569
 570         /*
 571          * check completion status of task management function
 572          */
 573         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 574                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
 575                 retval = -EIO;
 576         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
 577                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
 578                 retval = -ENOTSUPP;
 579         } else
 580                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
 581
 582         zfcp_fsf_req_free(fsf_req);
 583  out:
 584         return retval;
 585 }
 586
 587 /**
 588  * zfcp_scsi_eh_bus_reset_handler - reset bus (reopen adapter)
 589  */
 590 int
 591 zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *scpnt)
 592 {
 593         struct zfcp_unit *unit = (struct zfcp_unit*) scpnt->device->hostdata;
 594         struct zfcp_adapter *adapter = unit->port->adapter;
 595
 596         ZFCP_LOG_NORMAL("bus reset because of problems with "
 597                         "unit 0x%016Lx\n", unit->fcp_lun);
 598         zfcp_erp_adapter_reopen(adapter, 0);
 599         zfcp_erp_wait(adapter);
 600
 601         return SUCCESS;
 602 }
 603
 604 /**
 605  * zfcp_scsi_eh_host_reset_handler - reset host (reopen adapter)
 606  */
 607 int
 608 zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 609 {
 610         struct zfcp_unit *unit = (struct zfcp_unit*) scpnt->device->hostdata;
 611         struct zfcp_adapter *adapter = unit->port->adapter;
 612
 613         ZFCP_LOG_NORMAL("host reset because of problems with "
 614                         "unit 0x%016Lx\n", unit->fcp_lun);
 615         zfcp_erp_adapter_reopen(adapter, 0);
 616         zfcp_erp_wait(adapter);
 617
 618         return SUCCESS;
 619 }
 620
 621 /*
 622  * function:
 623  *
 624  * purpose:
 625  *
 626  * returns:
 627  */
 628 int
 629 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 630 {
 631         int retval = 0;
 632         static unsigned int unique_id = 0;
 633
 634         /* register adapter as SCSI host with mid layer of SCSI stack */
 635         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 636                                              sizeof (struct zfcp_adapter *));
 637         if (!adapter->scsi_host) {
 638                 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
 639                                 "for adapter %s ",
 640                                 zfcp_get_busid_by_adapter(adapter));
 641                 retval = -EIO;
 642                 goto out;
 643         }
 644         ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
 645
 646         /* tell the SCSI stack some characteristics of this adapter */
 647         adapter->scsi_host->max_id = 1;
 648         adapter->scsi_host->max_lun = 1;
 649         adapter->scsi_host->max_channel = 0;
 650         adapter->scsi_host->unique_id = unique_id++;    /* FIXME */
 651         adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
 652         adapter->scsi_host->transportt = zfcp_transport_template;
 653         /*
 654          * Reverse mapping of the host number to avoid race condition
 655          */
 656         adapter->scsi_host_no = adapter->scsi_host->host_no;
 657
 658         /*
 659          * save a pointer to our own adapter data structure within
 660          * hostdata field of SCSI host data structure
 661          */
 662         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 663
 664         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 665                 scsi_host_put(adapter->scsi_host);
 666                 retval = -EIO;
 667                 goto out;
 668         }
 669         atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 670  out:
 671         return retval;
 672 }
 673
 674 /*
 675  * function:
 676  *
 677  * purpose:
 678  *
 679  * returns:
 680  */
 681 void
 682 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 683 {
 684         struct Scsi_Host *shost;
 685         struct zfcp_port *port;
 686
 687         shost = adapter->scsi_host;
 688         if (!shost)
 689                 return;
 690         read_lock_irq(&zfcp_data.config_lock);
 691         list_for_each_entry(port, &adapter->port_list_head, list)
 692                 if (port->rport)
 693                         port->rport = NULL;
 694         read_unlock_irq(&zfcp_data.config_lock);
 695         fc_remove_host(shost);
 696         scsi_remove_host(shost);
 697         scsi_host_put(shost);
 698         adapter->scsi_host = NULL;
 699         adapter->scsi_host_no = 0;
 700         atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 701
 702         return;
 703 }
 704
 705
 706 void
 707 zfcp_fsf_start_scsi_er_timer(struct zfcp_adapter *adapter)
 708 {
 709         adapter->scsi_er_timer.function = zfcp_fsf_scsi_er_timeout_handler;
 710         adapter->scsi_er_timer.data = (unsigned long) adapter;
 711         adapter->scsi_er_timer.expires = jiffies + ZFCP_SCSI_ER_TIMEOUT;
 712         add_timer(&adapter->scsi_er_timer);
 713 }
 714
 715 /*
 716  * Support functions for FC transport class
 717  */
 718 static struct fc_host_statistics*
 719 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 720 {
 721         struct fc_host_statistics *fc_stats;
 722
 723         if (!adapter->fc_stats) {
 724                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 725                 if (!fc_stats)
 726                         return NULL;
 727                 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
 728         }
 729         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 730         return adapter->fc_stats;
 731 }
 732
 733 static void
 734 zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 735                           struct fsf_qtcb_bottom_port *data,
 736                           struct fsf_qtcb_bottom_port *old)
 737 {
 738         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset -
 739                 old->seconds_since_last_reset;
 740         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 741         fc_stats->tx_words = data->tx_words - old->tx_words;
 742         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 743         fc_stats->rx_words = data->rx_words - old->rx_words;
 744         fc_stats->lip_count = data->lip - old->lip;
 745         fc_stats->nos_count = data->nos - old->nos;
 746         fc_stats->error_frames = data->error_frames - old->error_frames;
 747         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 748         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 749         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 750         fc_stats->loss_of_signal_count = data->loss_of_signal -
 751                 old->loss_of_signal;
 752         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts -
 753                 old->psp_error_counts;
 754         fc_stats->invalid_tx_word_count = data->invalid_tx_words -
 755                 old->invalid_tx_words;
 756         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 757         fc_stats->fcp_input_requests = data->input_requests -
 758                 old->input_requests;
 759         fc_stats->fcp_output_requests = data->output_requests -
 760                 old->output_requests;
 761         fc_stats->fcp_control_requests = data->control_requests -
 762                 old->control_requests;
 763         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 764         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 765 }
 766
 767 static void
 768 zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 769                        struct fsf_qtcb_bottom_port *data)
 770 {
 771         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 772         fc_stats->tx_frames = data->tx_frames;
 773         fc_stats->tx_words = data->tx_words;
 774         fc_stats->rx_frames = data->rx_frames;
 775         fc_stats->rx_words = data->rx_words;
 776         fc_stats->lip_count = data->lip;
 777         fc_stats->nos_count = data->nos;
 778         fc_stats->error_frames = data->error_frames;
 779         fc_stats->dumped_frames = data->dumped_frames;
 780         fc_stats->link_failure_count = data->link_failure;
 781         fc_stats->loss_of_sync_count = data->loss_of_sync;
 782         fc_stats->loss_of_signal_count = data->loss_of_signal;
 783         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 784         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 785         fc_stats->invalid_crc_count = data->invalid_crcs;
 786         fc_stats->fcp_input_requests = data->input_requests;
 787         fc_stats->fcp_output_requests = data->output_requests;
 788         fc_stats->fcp_control_requests = data->control_requests;
 789         fc_stats->fcp_input_megabytes = data->input_mb;
 790         fc_stats->fcp_output_megabytes = data->output_mb;
 791 }
 792
 793 /**
 794  * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc
 795  *
 796  * assumption: scsi_transport_fc synchronizes calls of
 797  *             get_fc_host_stats and reset_fc_host_stats
 798  *             (XXX to be checked otherwise introduce locking)
 799  */
 800 static struct fc_host_statistics *
 801 zfcp_get_fc_host_stats(struct Scsi_Host *shost)
 802 {
 803         struct zfcp_adapter *adapter;
 804         struct fc_host_statistics *fc_stats;
 805         struct fsf_qtcb_bottom_port *data;
 806         int ret;
 807
 808         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 809         fc_stats = zfcp_init_fc_host_stats(adapter);
 810         if (!fc_stats)
 811                 return NULL;
 812
 813         data = kmalloc(sizeof(*data), GFP_KERNEL);
 814         if (!data)
 815                 return NULL;
 816         memset(data, 0, sizeof(*data));
 817
 818         ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
 819         if (ret) {
 820                 kfree(data);
 821                 return NULL; /* XXX return zeroed fc_stats? */
 822         }
 823
 824         if (adapter->stats_reset &&
 825             ((jiffies/HZ - adapter->stats_reset) <
 826              data->seconds_since_last_reset)) {
 827                 zfcp_adjust_fc_host_stats(fc_stats, data,
 828                                           adapter->stats_reset_data);
 829         } else
 830                 zfcp_set_fc_host_stats(fc_stats, data);
 831
 832         kfree(data);
 833         return fc_stats;
 834 }
 835
 836 static void
 837 zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 838 {
 839         struct zfcp_adapter *adapter;
 840         struct fsf_qtcb_bottom_port *data, *old_data;
 841         int ret;
 842
 843         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 844         data = kmalloc(sizeof(*data), GFP_KERNEL);
 845         if (!data)
 846                 return;
 847         memset(data, 0, sizeof(*data));
 848
 849         ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
 850         if (ret == 0) {
 851                 adapter->stats_reset = jiffies/HZ;
 852                 old_data = adapter->stats_reset_data;
 853                 adapter->stats_reset_data = data; /* finally freed in
 854                                                      adater_dequeue */
 855                 kfree(old_data);
 856         }
 857 }
 858
 859 struct fc_function_template zfcp_transport_functions = {
 860         .show_starget_port_id = 1,
 861         .show_starget_port_name = 1,
 862         .show_starget_node_name = 1,
 863         .show_rport_supported_classes = 1,
 864         .show_host_node_name = 1,
 865         .show_host_port_name = 1,
 866         .show_host_permanent_port_name = 1,
 867         .show_host_supported_classes = 1,
 868         .show_host_supported_speeds = 1,
 869         .show_host_maxframe_size = 1,
 870         .show_host_serial_number = 1,
 871         .get_fc_host_stats = zfcp_get_fc_host_stats,
 872         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 873         /* no functions registered for following dynamic attributes but
 874            directly set by LLDD */
 875         .show_host_port_type = 1,
 876         .show_host_speed = 1,
 877         .show_host_port_id = 1,
 878 };
 879
 880 /**
 881  * ZFCP_DEFINE_SCSI_ATTR
 882  * @_name:   name of show attribute
 883  * @_format: format string
 884  * @_value:  value to print
 885  *
 886  * Generates attribute for a unit.
 887  */
 888 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)                    \
 889 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr,        \
 890                                               char *buf)                 \
 891 {                                                                        \
 892         struct scsi_device *sdev;                                        \
 893         struct zfcp_unit *unit;                                          \
 894                                                                          \
 895         sdev = to_scsi_device(dev);                                      \
 896         unit = sdev->hostdata;                                           \
 897         return sprintf(buf, _format, _value);                            \
 898 }                                                                        \
 899                                                                          \
 900 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
 901
 902 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
 903 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
 904 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
 905
 906 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
 907         &dev_attr_fcp_lun,
 908         &dev_attr_wwpn,
 909         &dev_attr_hba_id,
 910         NULL
 911 };
 912
 913 #undef ZFCP_LOG_AREA