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
  53 static struct device_attribute *zfcp_sysfs_sdev_attrs[];
  54
  55 struct scsi_transport_template *zfcp_transport_template;
  56
  57 struct zfcp_data zfcp_data = {
  58         .scsi_host_template = {
  59               name:                    ZFCP_NAME,
  60               proc_name:               "zfcp",
  61               proc_info:               NULL,
  62               detect:                  NULL,
  63               slave_alloc:             zfcp_scsi_slave_alloc,
  64               slave_configure:         zfcp_scsi_slave_configure,
  65               slave_destroy:           zfcp_scsi_slave_destroy,
  66               queuecommand:            zfcp_scsi_queuecommand,
  67               eh_abort_handler:        zfcp_scsi_eh_abort_handler,
  68               eh_device_reset_handler: zfcp_scsi_eh_device_reset_handler,
  69               eh_bus_reset_handler:    zfcp_scsi_eh_bus_reset_handler,
  70               eh_host_reset_handler:   zfcp_scsi_eh_host_reset_handler,
  71                                        /* FIXME(openfcp): Tune */
  72               can_queue:               4096,
  73               this_id:                 0,
  74               /*
  75                * FIXME:
  76                * one less? can zfcp_create_sbale cope with it?
  77                */
  78               sg_tablesize:            ZFCP_MAX_SBALES_PER_REQ,
  79               cmd_per_lun:             1,
  80               unchecked_isa_dma:       0,
  81               use_clustering:          1,
  82               sdev_attrs:              zfcp_sysfs_sdev_attrs,
  83         },
  84         .driver_version = ZFCP_VERSION,
  85         /* rest initialised with zeros */
  86 };
  87
  88 /* Find start of Response Information in FCP response unit*/
  89 char *
  90 zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  91 {
  92         char *fcp_rsp_info_ptr;
  93
  94         fcp_rsp_info_ptr =
  95             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
  96
  97         return fcp_rsp_info_ptr;
  98 }
  99
 100 /* Find start of Sense Information in FCP response unit*/
 101 char *
 102 zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
 103 {
 104         char *fcp_sns_info_ptr;
 105
 106         fcp_sns_info_ptr =
 107             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
 108         if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
 109                 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr +
 110                     fcp_rsp_iu->fcp_rsp_len;
 111
 112         return fcp_sns_info_ptr;
 113 }
 114
 115 fcp_dl_t *
 116 zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd)
 117 {
 118         int additional_length = fcp_cmd->add_fcp_cdb_length << 2;
 119         fcp_dl_t *fcp_dl_addr;
 120
 121         fcp_dl_addr = (fcp_dl_t *)
 122                 ((unsigned char *) fcp_cmd +
 123                  sizeof (struct fcp_cmnd_iu) + additional_length);
 124         /*
 125          * fcp_dl_addr = start address of fcp_cmnd structure +
 126          * size of fixed part + size of dynamically sized add_dcp_cdb field
 127          * SEE FCP-2 documentation
 128          */
 129         return fcp_dl_addr;
 130 }
 131
 132 fcp_dl_t
 133 zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd)
 134 {
 135         return *zfcp_get_fcp_dl_ptr(fcp_cmd);
 136 }
 137
 138 void
 139 zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
 140 {
 141         *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl;
 142 }
 143
 144 /*
 145  * note: it's a bit-or operation not an assignment
 146  * regarding the specified byte
 147  */
 148 static inline void
 149 set_byte(u32 * result, char status, char pos)
 150 {
 151         *result |= status << (pos * 8);
 152 }
 153
 154 void
 155 set_host_byte(u32 * result, char status)
 156 {
 157         set_byte(result, status, 2);
 158 }
 159
 160 void
 161 set_driver_byte(u32 * result, char status)
 162 {
 163         set_byte(result, status, 3);
 164 }
 165
 166 /*
 167  * function:    zfcp_scsi_slave_alloc
 168  *
 169  * purpose:
 170  *
 171  * returns:
 172  */
 173
 174 static int
 175 zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 176 {
 177         struct zfcp_adapter *adapter;
 178         struct zfcp_unit *unit;
 179         unsigned long flags;
 180         int retval = -ENXIO;
 181
 182         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 183         if (!adapter)
 184                 goto out;
 185
 186         read_lock_irqsave(&zfcp_data.config_lock, flags);
 187         unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
 188         if (unit) {
 189                 sdp->hostdata = unit;
 190                 unit->device = sdp;
 191                 zfcp_unit_get(unit);
 192                 retval = 0;
 193         }
 194         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 195  out:
 196         return retval;
 197 }
 198
 199 /*
 200  * function:    zfcp_scsi_slave_destroy
 201  *
 202  * purpose:
 203  *
 204  * returns:
 205  */
 206
 207 static void
 208 zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
 209 {
 210         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
 211
 212         if (unit) {
 213                 sdpnt->hostdata = NULL;
 214                 unit->device = NULL;
 215                 zfcp_unit_put(unit);
 216         } else {
 217                 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at "
 218                                 "address %p\n", sdpnt);
 219         }
 220 }
 221
 222 /*
 223  * called from scsi midlayer to allow finetuning of a device.
 224  */
 225 static int
 226 zfcp_scsi_slave_configure(struct scsi_device *sdp)
 227 {
 228         if (sdp->tagged_supported)
 229                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN);
 230         else
 231                 scsi_adjust_queue_depth(sdp, 0, 1);
 232         return 0;
 233 }
 234
 235 /**
 236  * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function
 237  * @scpnt: pointer to struct scsi_cmnd where result is set
 238  * @result: result to be set in scpnt (e.g. DID_ERROR)
 239  */
 240 static void
 241 zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
 242 {
 243         set_host_byte(&scpnt->result, result);
 244         if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
 245                 zfcp_scsi_dbf_event_result("fail", 4,
 246                         (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
 247                         scpnt);
 248         /* return directly */
 249         scpnt->scsi_done(scpnt);
 250 }
 251
 252 /**
 253  * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and
 254  *      zfcp_scsi_command_sync
 255  * @adapter: adapter where scsi command is issued
 256  * @unit: unit to which scsi command is sent
 257  * @scpnt: scsi command to be sent
 258  * @timer: timer to be started if request is successfully initiated
 259  *
 260  * Note: In scsi_done function must be set in scpnt.
 261  */
 262 int
 263 zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit,
 264                         struct scsi_cmnd *scpnt, struct timer_list *timer)
 265 {
 266         int tmp;
 267         int retval;
 268
 269         retval = 0;
 270
 271         BUG_ON((adapter == NULL) || (adapter != unit->port->adapter));
 272         BUG_ON(scpnt->scsi_done == NULL);
 273
 274         if (unlikely(NULL == unit)) {
 275                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
 276                 goto out;
 277         }
 278
 279         if (unlikely(
 280               atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) ||
 281              !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) {
 282                 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port "
 283                                "0x%016Lx on adapter %s\n",
 284                                unit->fcp_lun, unit->port->wwpn,
 285                                zfcp_get_busid_by_adapter(adapter));
 286                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 287                 goto out;
 288         }
 289
 290         if (unlikely(
 291              !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) {
 292                 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx "
 293                                "on port 0x%016Lx in recovery\n",
 294                                zfcp_get_busid_by_unit(unit),
 295                                unit->fcp_lun, unit->port->wwpn);
 296                 retval = SCSI_MLQUEUE_DEVICE_BUSY;
 297                 goto out;
 298         }
 299
 300         tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, timer,
 301                                              ZFCP_REQ_AUTO_CLEANUP);
 302
 303         if (unlikely(tmp < 0)) {
 304                 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n");
 305                 retval = SCSI_MLQUEUE_HOST_BUSY;
 306         }
 307
 308 out:
 309         return retval;
 310 }
 311
 312 void
 313 zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt)
 314 {
 315         struct completion *wait = (struct completion *) scpnt->SCp.ptr;
 316         complete(wait);
 317 }
 318
 319
 320 /**
 321  * zfcp_scsi_command_sync - send a SCSI command and wait for completion
 322  * @unit: unit where command is sent to
 323  * @scpnt: scsi command to be sent
 324  * @timer: timer to be started if request is successfully initiated
 325  * Return: 0
 326  *
 327  * Errors are indicated in scpnt->result
 328  */
 329 int
 330 zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt,
 331                        struct timer_list *timer)
 332 {
 333         int ret;
 334         DECLARE_COMPLETION(wait);
 335
 336         scpnt->SCp.ptr = (void *) &wait;  /* silent re-use */
 337         scpnt->scsi_done = zfcp_scsi_command_sync_handler;
 338         ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, timer);
 339         if (ret == 0)
 340                 wait_for_completion(&wait);
 341
 342         scpnt->SCp.ptr = NULL;
 343
 344         return 0;
 345 }
 346
 347 /*
 348  * function:    zfcp_scsi_queuecommand
 349  *
 350  * purpose:     enqueues a SCSI command to the specified target device
 351  *
 352  * returns:     0 - success, SCSI command enqueued
 353  *              !0 - failure
 354  */
 355 int
 356 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
 357                        void (*done) (struct scsi_cmnd *))
 358 {
 359         struct zfcp_unit *unit;
 360         struct zfcp_adapter *adapter;
 361
 362         /* reset the status for this request */
 363         scpnt->result = 0;
 364         scpnt->host_scribble = NULL;
 365         scpnt->scsi_done = done;
 366
 367         /*
 368          * figure out adapter and target device
 369          * (stored there by zfcp_scsi_slave_alloc)
 370          */
 371         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
 372         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 373
 374         return zfcp_scsi_command_async(adapter, unit, scpnt, NULL);
 375 }
 376
 377 /*
 378  * function:    zfcp_unit_lookup
 379  *
 380  * purpose:
 381  *
 382  * returns:
 383  *
 384  * context:
 385  */
 386 static struct zfcp_unit *
 387 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id,
 388                  scsi_lun_t lun)
 389 {
 390         struct zfcp_port *port;
 391         struct zfcp_unit *unit, *retval = NULL;
 392
 393         list_for_each_entry(port, &adapter->port_list_head, list) {
 394                 if (!port->rport || (id != port->rport->scsi_target_id))
 395                         continue;
 396                 list_for_each_entry(unit, &port->unit_list_head, list) {
 397                         if (lun == unit->scsi_lun) {
 398                                 retval = unit;
 399                                 goto out;
 400                         }
 401                 }
 402         }
 403  out:
 404         return retval;
 405 }
 406
 407 /**
 408  * zfcp_scsi_eh_abort_handler - abort the specified SCSI command
 409  * @scpnt: pointer to scsi_cmnd to be aborted
 410  * Return: SUCCESS - command has been aborted and cleaned up in internal
 411  *          bookkeeping, SCSI stack won't be called for aborted command
 412  *         FAILED - otherwise
 413  *
 414  * We do not need to care for a SCSI command which completes normally
 415  * but late during this abort routine runs.  We are allowed to return
 416  * late commands to the SCSI stack.  It tracks the state of commands and
 417  * will handle late commands.  (Usually, the normal completion of late
 418  * commands is ignored with respect to the running abort operation.)
 419  */
 420 int
 421 zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 422 {
 423         struct Scsi_Host *scsi_host;
 424         struct zfcp_adapter *adapter;
 425         struct zfcp_unit *unit;
 426         int retval = SUCCESS;
 427         struct zfcp_fsf_req *new_fsf_req = NULL;
 428         struct zfcp_fsf_req *old_fsf_req;
 429         unsigned long flags;
 430
 431         scsi_host = scpnt->device->host;
 432         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
 433         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 434
 435         ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
 436                       scpnt, zfcp_get_busid_by_adapter(adapter));
 437
 438         /* avoid race condition between late normal completion and abort */
 439         write_lock_irqsave(&adapter->abort_lock, flags);
 440
 441         /*
 442          * Check whether command has just completed and can not be aborted.
 443          * Even if the command has just been completed late, we can access
 444          * scpnt since the SCSI stack does not release it at least until
 445          * this routine returns. (scpnt is parameter passed to this routine
 446          * and must not disappear during abort even on late completion.)
 447          */
 448         old_fsf_req = (struct zfcp_fsf_req *) scpnt->host_scribble;
 449         if (!old_fsf_req) {
 450                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 451                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, new_fsf_req);
 452                 retval = SUCCESS;
 453                 goto out;
 454         }
 455         old_fsf_req->data = 0;
 456         old_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
 457
 458         /* don't access old_fsf_req after releasing the abort_lock */
 459         write_unlock_irqrestore(&adapter->abort_lock, flags);
 460         /* call FSF routine which does the abort */
 461         new_fsf_req = zfcp_fsf_abort_fcp_command((unsigned long) old_fsf_req,
 462                                                  adapter, unit, 0);
 463         if (!new_fsf_req) {
 464                 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n");
 465                 retval = FAILED;
 466                 goto out;
 467         }
 468
 469         /* wait for completion of abort */
 470         __wait_event(new_fsf_req->completion_wq,
 471                      new_fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 472
 473         /* status should be valid since signals were not permitted */
 474         if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
 475                 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, new_fsf_req);
 476                 retval = SUCCESS;
 477         } else if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
 478                 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, new_fsf_req);
 479                 retval = SUCCESS;
 480         } else {
 481                 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, new_fsf_req);
 482                 retval = FAILED;
 483         }
 484         zfcp_fsf_req_free(new_fsf_req);
 485  out:
 486         return retval;
 487 }
 488
 489 /*
 490  * function:    zfcp_scsi_eh_device_reset_handler
 491  *
 492  * purpose:
 493  *
 494  * returns:
 495  */
 496 int
 497 zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 498 {
 499         int retval;
 500         struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
 501
 502         if (!unit) {
 503                 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
 504                 retval = SUCCESS;
 505                 goto out;
 506         }
 507         ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun);
 508
 509         /*
 510          * If we do not know whether the unit supports 'logical unit reset'
 511          * then try 'logical unit reset' and proceed with 'target reset'
 512          * if 'logical unit reset' fails.
 513          * If the unit is known not to support 'logical unit reset' then
 514          * skip 'logical unit reset' and try 'target reset' immediately.
 515          */
 516         if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 517                               &unit->status)) {
 518                 retval = zfcp_task_management_function(unit,
 519                                                        FCP_LOGICAL_UNIT_RESET,
 520                                                        scpnt);
 521                 if (retval) {
 522                         ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit);
 523                         if (retval == -ENOTSUPP)
 524                                 atomic_set_mask
 525                                     (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 526                                      &unit->status);
 527                         /* fall through and try 'target reset' next */
 528                 } else {
 529                         ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n",
 530                                        unit);
 531                         /* avoid 'target reset' */
 532                         retval = SUCCESS;
 533                         goto out;
 534                 }
 535         }
 536         retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt);
 537         if (retval) {
 538                 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit);
 539                 retval = FAILED;
 540         } else {
 541                 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit);
 542                 retval = SUCCESS;
 543         }
 544  out:
 545         return retval;
 546 }
 547
 548 static int
 549 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags,
 550                               struct scsi_cmnd *scpnt)
 551 {
 552         struct zfcp_adapter *adapter = unit->port->adapter;
 553         struct zfcp_fsf_req *fsf_req;
 554         int retval = 0;
 555
 556         /* issue task management function */
 557         fsf_req = zfcp_fsf_send_fcp_command_task_management
 558                 (adapter, unit, tm_flags, 0);
 559         if (!fsf_req) {
 560                 ZFCP_LOG_INFO("error: creation of task management request "
 561                               "failed for unit 0x%016Lx on port 0x%016Lx on  "
 562                               "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
 563                               zfcp_get_busid_by_adapter(adapter));
 564                 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
 565                 retval = -ENOMEM;
 566                 goto out;
 567         }
 568
 569         __wait_event(fsf_req->completion_wq,
 570                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 571
 572         /*
 573          * check completion status of task management function
 574          */
 575         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 576                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
 577                 retval = -EIO;
 578         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
 579                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
 580                 retval = -ENOTSUPP;
 581         } else
 582                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
 583
 584         zfcp_fsf_req_free(fsf_req);
 585  out:
 586         return retval;
 587 }
 588
 589 /**
 590  * zfcp_scsi_eh_bus_reset_handler - reset bus (reopen adapter)
 591  */
 592 int
 593 zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *scpnt)
 594 {
 595         struct zfcp_unit *unit = (struct zfcp_unit*) scpnt->device->hostdata;
 596         struct zfcp_adapter *adapter = unit->port->adapter;
 597
 598         ZFCP_LOG_NORMAL("bus reset because of problems with "
 599                         "unit 0x%016Lx\n", unit->fcp_lun);
 600         zfcp_erp_adapter_reopen(adapter, 0);
 601         zfcp_erp_wait(adapter);
 602
 603         return SUCCESS;
 604 }
 605
 606 /**
 607  * zfcp_scsi_eh_host_reset_handler - reset host (reopen adapter)
 608  */
 609 int
 610 zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 611 {
 612         struct zfcp_unit *unit = (struct zfcp_unit*) scpnt->device->hostdata;
 613         struct zfcp_adapter *adapter = unit->port->adapter;
 614
 615         ZFCP_LOG_NORMAL("host reset because of problems with "
 616                         "unit 0x%016Lx\n", unit->fcp_lun);
 617         zfcp_erp_adapter_reopen(adapter, 0);
 618         zfcp_erp_wait(adapter);
 619
 620         return SUCCESS;
 621 }
 622
 623 /*
 624  * function:
 625  *
 626  * purpose:
 627  *
 628  * returns:
 629  */
 630 int
 631 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 632 {
 633         int retval = 0;
 634         static unsigned int unique_id = 0;
 635
 636         /* register adapter as SCSI host with mid layer of SCSI stack */
 637         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 638                                              sizeof (struct zfcp_adapter *));
 639         if (!adapter->scsi_host) {
 640                 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
 641                                 "for adapter %s ",
 642                                 zfcp_get_busid_by_adapter(adapter));
 643                 retval = -EIO;
 644                 goto out;
 645         }
 646         ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
 647
 648         /* tell the SCSI stack some characteristics of this adapter */
 649         adapter->scsi_host->max_id = 1;
 650         adapter->scsi_host->max_lun = 1;
 651         adapter->scsi_host->max_channel = 0;
 652         adapter->scsi_host->unique_id = unique_id++;    /* FIXME */
 653         adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
 654         adapter->scsi_host->transportt = zfcp_transport_template;
 655         /*
 656          * Reverse mapping of the host number to avoid race condition
 657          */
 658         adapter->scsi_host_no = adapter->scsi_host->host_no;
 659
 660         /*
 661          * save a pointer to our own adapter data structure within
 662          * hostdata field of SCSI host data structure
 663          */
 664         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 665
 666         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 667                 scsi_host_put(adapter->scsi_host);
 668                 retval = -EIO;
 669                 goto out;
 670         }
 671         atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 672  out:
 673         return retval;
 674 }
 675
 676 /*
 677  * function:
 678  *
 679  * purpose:
 680  *
 681  * returns:
 682  */
 683 void
 684 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 685 {
 686         struct Scsi_Host *shost;
 687         struct zfcp_port *port;
 688
 689         shost = adapter->scsi_host;
 690         if (!shost)
 691                 return;
 692         read_lock_irq(&zfcp_data.config_lock);
 693         list_for_each_entry(port, &adapter->port_list_head, list)
 694                 if (port->rport)
 695                         port->rport = NULL;
 696         read_unlock_irq(&zfcp_data.config_lock);
 697         fc_remove_host(shost);
 698         scsi_remove_host(shost);
 699         scsi_host_put(shost);
 700         adapter->scsi_host = NULL;
 701         adapter->scsi_host_no = 0;
 702         atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 703
 704         return;
 705 }
 706
 707
 708 void
 709 zfcp_fsf_start_scsi_er_timer(struct zfcp_adapter *adapter)
 710 {
 711         adapter->scsi_er_timer.function = zfcp_fsf_scsi_er_timeout_handler;
 712         adapter->scsi_er_timer.data = (unsigned long) adapter;
 713         adapter->scsi_er_timer.expires = jiffies + ZFCP_SCSI_ER_TIMEOUT;
 714         add_timer(&adapter->scsi_er_timer);
 715 }
 716
 717 /*
 718  * Support functions for FC transport class
 719  */
 720 static struct fc_host_statistics*
 721 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 722 {
 723         struct fc_host_statistics *fc_stats;
 724
 725         if (!adapter->fc_stats) {
 726                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 727                 if (!fc_stats)
 728                         return NULL;
 729                 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
 730         }
 731         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 732         return adapter->fc_stats;
 733 }
 734
 735 static void
 736 zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 737                           struct fsf_qtcb_bottom_port *data,
 738                           struct fsf_qtcb_bottom_port *old)
 739 {
 740         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset -
 741                 old->seconds_since_last_reset;
 742         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 743         fc_stats->tx_words = data->tx_words - old->tx_words;
 744         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 745         fc_stats->rx_words = data->rx_words - old->rx_words;
 746         fc_stats->lip_count = data->lip - old->lip;
 747         fc_stats->nos_count = data->nos - old->nos;
 748         fc_stats->error_frames = data->error_frames - old->error_frames;
 749         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 750         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 751         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 752         fc_stats->loss_of_signal_count = data->loss_of_signal -
 753                 old->loss_of_signal;
 754         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts -
 755                 old->psp_error_counts;
 756         fc_stats->invalid_tx_word_count = data->invalid_tx_words -
 757                 old->invalid_tx_words;
 758         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 759         fc_stats->fcp_input_requests = data->input_requests -
 760                 old->input_requests;
 761         fc_stats->fcp_output_requests = data->output_requests -
 762                 old->output_requests;
 763         fc_stats->fcp_control_requests = data->control_requests -
 764                 old->control_requests;
 765         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 766         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 767 }
 768
 769 static void
 770 zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 771                        struct fsf_qtcb_bottom_port *data)
 772 {
 773         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 774         fc_stats->tx_frames = data->tx_frames;
 775         fc_stats->tx_words = data->tx_words;
 776         fc_stats->rx_frames = data->rx_frames;
 777         fc_stats->rx_words = data->rx_words;
 778         fc_stats->lip_count = data->lip;
 779         fc_stats->nos_count = data->nos;
 780         fc_stats->error_frames = data->error_frames;
 781         fc_stats->dumped_frames = data->dumped_frames;
 782         fc_stats->link_failure_count = data->link_failure;
 783         fc_stats->loss_of_sync_count = data->loss_of_sync;
 784         fc_stats->loss_of_signal_count = data->loss_of_signal;
 785         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 786         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 787         fc_stats->invalid_crc_count = data->invalid_crcs;
 788         fc_stats->fcp_input_requests = data->input_requests;
 789         fc_stats->fcp_output_requests = data->output_requests;
 790         fc_stats->fcp_control_requests = data->control_requests;
 791         fc_stats->fcp_input_megabytes = data->input_mb;
 792         fc_stats->fcp_output_megabytes = data->output_mb;
 793 }
 794
 795 /**
 796  * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc
 797  *
 798  * assumption: scsi_transport_fc synchronizes calls of
 799  *             get_fc_host_stats and reset_fc_host_stats
 800  *             (XXX to be checked otherwise introduce locking)
 801  */
 802 static struct fc_host_statistics *
 803 zfcp_get_fc_host_stats(struct Scsi_Host *shost)
 804 {
 805         struct zfcp_adapter *adapter;
 806         struct fc_host_statistics *fc_stats;
 807         struct fsf_qtcb_bottom_port *data;
 808         int ret;
 809
 810         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 811         fc_stats = zfcp_init_fc_host_stats(adapter);
 812         if (!fc_stats)
 813                 return NULL;
 814
 815         data = kmalloc(sizeof(*data), GFP_KERNEL);
 816         if (!data)
 817                 return NULL;
 818         memset(data, 0, sizeof(*data));
 819
 820         ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
 821         if (ret) {
 822                 kfree(data);
 823                 return NULL; /* XXX return zeroed fc_stats? */
 824         }
 825
 826         if (adapter->stats_reset &&
 827             ((jiffies/HZ - adapter->stats_reset) <
 828              data->seconds_since_last_reset)) {
 829                 zfcp_adjust_fc_host_stats(fc_stats, data,
 830                                           adapter->stats_reset_data);
 831         } else
 832                 zfcp_set_fc_host_stats(fc_stats, data);
 833
 834         kfree(data);
 835         return fc_stats;
 836 }
 837
 838 static void
 839 zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 840 {
 841         struct zfcp_adapter *adapter;
 842         struct fsf_qtcb_bottom_port *data, *old_data;
 843         int ret;
 844
 845         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 846         data = kmalloc(sizeof(*data), GFP_KERNEL);
 847         if (!data)
 848                 return;
 849         memset(data, 0, sizeof(*data));
 850
 851         ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
 852         if (ret == 0) {
 853                 adapter->stats_reset = jiffies/HZ;
 854                 old_data = adapter->stats_reset_data;
 855                 adapter->stats_reset_data = data; /* finally freed in
 856                                                      adater_dequeue */
 857                 kfree(old_data);
 858         }
 859 }
 860
 861 struct fc_function_template zfcp_transport_functions = {
 862         .show_starget_port_id = 1,
 863         .show_starget_port_name = 1,
 864         .show_starget_node_name = 1,
 865         .show_rport_supported_classes = 1,
 866         .show_host_node_name = 1,
 867         .show_host_port_name = 1,
 868         .show_host_permanent_port_name = 1,
 869         .show_host_supported_classes = 1,
 870         .show_host_supported_speeds = 1,
 871         .show_host_maxframe_size = 1,
 872         .show_host_serial_number = 1,
 873         .get_fc_host_stats = zfcp_get_fc_host_stats,
 874         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 875         /* no functions registered for following dynamic attributes but
 876            directly set by LLDD */
 877         .show_host_port_type = 1,
 878         .show_host_speed = 1,
 879         .show_host_port_id = 1,
 880 };
 881
 882 /**
 883  * ZFCP_DEFINE_SCSI_ATTR
 884  * @_name:   name of show attribute
 885  * @_format: format string
 886  * @_value:  value to print
 887  *
 888  * Generates attribute for a unit.
 889  */
 890 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)                    \
 891 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr,        \
 892                                               char *buf)                 \
 893 {                                                                        \
 894         struct scsi_device *sdev;                                        \
 895         struct zfcp_unit *unit;                                          \
 896                                                                          \
 897         sdev = to_scsi_device(dev);                                      \
 898         unit = sdev->hostdata;                                           \
 899         return sprintf(buf, _format, _value);                            \
 900 }                                                                        \
 901                                                                          \
 902 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
 903
 904 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
 905 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
 906 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
 907
 908 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
 909         &dev_attr_fcp_lun,
 910         &dev_attr_wwpn,
 911         &dev_attr_hba_id,
 912         NULL
 913 };
 914
 915 #undef ZFCP_LOG_AREA