drivers/s390/scsi/zfcp_scsi.c

   1 /*
   2  * This file is part of the zfcp device driver for
   3  * FCP adapters for IBM System z9 and zSeries.
   4  *
   5  * (C) Copyright IBM Corp. 2002, 2006
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_SCSI
  23
  24 #include "zfcp_ext.h"
  25
  26 static void zfcp_scsi_slave_destroy(struct scsi_device *sdp);
  27 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp);
  28 static int zfcp_scsi_slave_configure(struct scsi_device *sdp);
  29 static int zfcp_scsi_queuecommand(struct scsi_cmnd *,
  30                                   void (*done) (struct scsi_cmnd *));
  31 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *);
  32 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *);
  33 static int zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *);
  34 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *);
  35 static int zfcp_task_management_function(struct zfcp_unit *, u8,
  36                                          struct scsi_cmnd *);
  37
  38 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int,
  39                                           unsigned int, unsigned int);
  40
  41 static struct device_attribute *zfcp_sysfs_sdev_attrs[];
  42
  43 struct scsi_transport_template *zfcp_transport_template;
  44
  45 struct zfcp_data zfcp_data = {
  46         .scsi_host_template = {
  47                 .name                   = ZFCP_NAME,
  48                 .proc_name              = "zfcp",
  49                 .proc_info              = NULL,
  50                 .detect                 = NULL,
  51                 .slave_alloc            = zfcp_scsi_slave_alloc,
  52                 .slave_configure        = zfcp_scsi_slave_configure,
  53                 .slave_destroy          = zfcp_scsi_slave_destroy,
  54                 .queuecommand           = zfcp_scsi_queuecommand,
  55                 .eh_abort_handler       = zfcp_scsi_eh_abort_handler,
  56                 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
  57                 .eh_bus_reset_handler   = zfcp_scsi_eh_bus_reset_handler,
  58                 .eh_host_reset_handler  = zfcp_scsi_eh_host_reset_handler,
  59                 .can_queue              = 4096,
  60                 .this_id                = -1,
  61                 /*
  62                  * FIXME:
  63                  * one less? can zfcp_create_sbale cope with it?
  64                  */
  65                 .sg_tablesize           = ZFCP_MAX_SBALES_PER_REQ,
  66                 .cmd_per_lun            = 1,
  67                 .unchecked_isa_dma      = 0,
  68                 .use_clustering         = 1,
  69                 .sdev_attrs             = zfcp_sysfs_sdev_attrs,
  70         },
  71         .driver_version = ZFCP_VERSION,
  72         /* rest initialised with zeros */
  73 };
  74
  75 /* Find start of Response Information in FCP response unit*/
  76 char *
  77 zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  78 {
  79         char *fcp_rsp_info_ptr;
  80
  81         fcp_rsp_info_ptr =
  82             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
  83
  84         return fcp_rsp_info_ptr;
  85 }
  86
  87 /* Find start of Sense Information in FCP response unit*/
  88 char *
  89 zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  90 {
  91         char *fcp_sns_info_ptr;
  92
  93         fcp_sns_info_ptr =
  94             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
  95         if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
  96                 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr +
  97                     fcp_rsp_iu->fcp_rsp_len;
  98
  99         return fcp_sns_info_ptr;
 100 }
 101
 102 fcp_dl_t *
 103 zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd)
 104 {
 105         int additional_length = fcp_cmd->add_fcp_cdb_length << 2;
 106         fcp_dl_t *fcp_dl_addr;
 107
 108         fcp_dl_addr = (fcp_dl_t *)
 109                 ((unsigned char *) fcp_cmd +
 110                  sizeof (struct fcp_cmnd_iu) + additional_length);
 111         /*
 112          * fcp_dl_addr = start address of fcp_cmnd structure +
 113          * size of fixed part + size of dynamically sized add_dcp_cdb field
 114          * SEE FCP-2 documentation
 115          */
 116         return fcp_dl_addr;
 117 }
 118
 119 fcp_dl_t
 120 zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd)
 121 {
 122         return *zfcp_get_fcp_dl_ptr(fcp_cmd);
 123 }
 124
 125 void
 126 zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
 127 {
 128         *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl;
 129 }
 130
 131 /*
 132  * note: it's a bit-or operation not an assignment
 133  * regarding the specified byte
 134  */
 135 static inline void
 136 set_byte(u32 * result, char status, char pos)
 137 {
 138         *result |= status << (pos * 8);
 139 }
 140
 141 void
 142 set_host_byte(u32 * result, char status)
 143 {
 144         set_byte(result, status, 2);
 145 }
 146
 147 void
 148 set_driver_byte(u32 * result, char status)
 149 {
 150         set_byte(result, status, 3);
 151 }
 152
 153 static int
 154 zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 155 {
 156         struct zfcp_adapter *adapter;
 157         struct zfcp_unit *unit;
 158         unsigned long flags;
 159         int retval = -ENXIO;
 160
 161         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 162         if (!adapter)
 163                 goto out;
 164
 165         read_lock_irqsave(&zfcp_data.config_lock, flags);
 166         unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
 167         if (unit && atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED,
 168                                      &unit->status)) {
 169                 sdp->hostdata = unit;
 170                 unit->device = sdp;
 171                 zfcp_unit_get(unit);
 172                 retval = 0;
 173         }
 174         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 175  out:
 176         return retval;
 177 }
 178
 179 static void
 180 zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
 181 {
 182         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
 183
 184         if (unit) {
 185                 atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status);
 186                 sdpnt->hostdata = NULL;
 187                 unit->device = NULL;
 188                 zfcp_unit_put(unit);
 189         } else {
 190                 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at "
 191                                 "address %p\n", sdpnt);
 192         }
 193 }
 194
 195 /*
 196  * called from scsi midlayer to allow finetuning of a device.
 197  */
 198 static int
 199 zfcp_scsi_slave_configure(struct scsi_device *sdp)
 200 {
 201         if (sdp->tagged_supported)
 202                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN);
 203         else
 204                 scsi_adjust_queue_depth(sdp, 0, 1);
 205         return 0;
 206 }
 207
 208 /**
 209  * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function
 210  * @scpnt: pointer to struct scsi_cmnd where result is set
 211  * @result: result to be set in scpnt (e.g. DID_ERROR)
 212  */
 213 static void
 214 zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
 215 {
 216         set_host_byte(&scpnt->result, result);
 217         if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
 218                 zfcp_scsi_dbf_event_result("fail", 4,
 219                         (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
 220                         scpnt, NULL);
 221         /* return directly */
 222         scpnt->scsi_done(scpnt);
 223 }
 224
 225 /**
 226  * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and
 227  *      zfcp_scsi_command_sync
 228  * @adapter: adapter where scsi command is issued
 229  * @unit: unit to which scsi command is sent
 230  * @scpnt: scsi command to be sent
 231  * @timer: timer to be started if request is successfully initiated
 232  *
 233  * Note: In scsi_done function must be set in scpnt.
 234  */
 235 int
 236 zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit,
 237                         struct scsi_cmnd *scpnt, struct timer_list *timer)
 238 {
 239         int tmp;
 240         int retval;
 241
 242         retval = 0;
 243
 244         BUG_ON((adapter == NULL) || (adapter != unit->port->adapter));
 245         BUG_ON(scpnt->scsi_done == NULL);
 246
 247         if (unlikely(NULL == unit)) {
 248                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
 249                 goto out;
 250         }
 251
 252         if (unlikely(
 253               atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) ||
 254              !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) {
 255                 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port "
 256                                "0x%016Lx on adapter %s\n",
 257                                unit->fcp_lun, unit->port->wwpn,
 258                                zfcp_get_busid_by_adapter(adapter));
 259                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 260                 goto out;
 261         }
 262
 263         if (unlikely(
 264              !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) {
 265                 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx "
 266                                "on port 0x%016Lx in recovery\n",
 267                                zfcp_get_busid_by_unit(unit),
 268                                unit->fcp_lun, unit->port->wwpn);
 269                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
 270                 goto out;
 271         }
 272
 273         tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, timer,
 274                                              ZFCP_REQ_AUTO_CLEANUP);
 275
 276         if (unlikely(tmp < 0)) {
 277                 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n");
 278                 retval = SCSI_MLQUEUE_HOST_BUSY;
 279         }
 280
 281 out:
 282         return retval;
 283 }
 284
 285 void
 286 zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt)
 287 {
 288         struct completion *wait = (struct completion *) scpnt->SCp.ptr;
 289         complete(wait);
 290 }
 291
 292
 293 /**
 294  * zfcp_scsi_command_sync - send a SCSI command and wait for completion
 295  * @unit: unit where command is sent to
 296  * @scpnt: scsi command to be sent
 297  * @timer: timer to be started if request is successfully initiated
 298  * Return: 0
 299  *
 300  * Errors are indicated in scpnt->result
 301  */
 302 int
 303 zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt,
 304                        struct timer_list *timer)
 305 {
 306         int ret;
 307         DECLARE_COMPLETION(wait);
 308
 309         scpnt->SCp.ptr = (void *) &wait;  /* silent re-use */
 310         scpnt->scsi_done = zfcp_scsi_command_sync_handler;
 311         ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, timer);
 312         if (ret == 0)
 313                 wait_for_completion(&wait);
 314
 315         scpnt->SCp.ptr = NULL;
 316
 317         return 0;
 318 }
 319
 320 /*
 321  * function:    zfcp_scsi_queuecommand
 322  *
 323  * purpose:     enqueues a SCSI command to the specified target device
 324  *
 325  * returns:     0 - success, SCSI command enqueued
 326  *              !0 - failure
 327  */
 328 int
 329 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
 330                        void (*done) (struct scsi_cmnd *))
 331 {
 332         struct zfcp_unit *unit;
 333         struct zfcp_adapter *adapter;
 334
 335         /* reset the status for this request */
 336         scpnt->result = 0;
 337         scpnt->host_scribble = NULL;
 338         scpnt->scsi_done = done;
 339
 340         /*
 341          * figure out adapter and target device
 342          * (stored there by zfcp_scsi_slave_alloc)
 343          */
 344         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
 345         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 346
 347         return zfcp_scsi_command_async(adapter, unit, scpnt, NULL);
 348 }
 349
 350 static struct zfcp_unit *
 351 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, unsigned int id,
 352                  unsigned int lun)
 353 {
 354         struct zfcp_port *port;
 355         struct zfcp_unit *unit, *retval = NULL;
 356
 357         list_for_each_entry(port, &adapter->port_list_head, list) {
 358                 if (!port->rport || (id != port->rport->scsi_target_id))
 359                         continue;
 360                 list_for_each_entry(unit, &port->unit_list_head, list) {
 361                         if (lun == unit->scsi_lun) {
 362                                 retval = unit;
 363                                 goto out;
 364                         }
 365                 }
 366         }
 367  out:
 368         return retval;
 369 }
 370
 371 /**
 372  * zfcp_scsi_eh_abort_handler - abort the specified SCSI command
 373  * @scpnt: pointer to scsi_cmnd to be aborted
 374  * Return: SUCCESS - command has been aborted and cleaned up in internal
 375  *          bookkeeping, SCSI stack won't be called for aborted command
 376  *         FAILED - otherwise
 377  *
 378  * We do not need to care for a SCSI command which completes normally
 379  * but late during this abort routine runs.  We are allowed to return
 380  * late commands to the SCSI stack.  It tracks the state of commands and
 381  * will handle late commands.  (Usually, the normal completion of late
 382  * commands is ignored with respect to the running abort operation.)
 383  */
 384 int
 385 zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 386 {
 387         struct Scsi_Host *scsi_host;
 388         struct zfcp_adapter *adapter;
 389         struct zfcp_unit *unit;
 390         int retval = SUCCESS;
 391         struct zfcp_fsf_req *new_fsf_req = NULL;
 392         struct zfcp_fsf_req *old_fsf_req;
 393         unsigned long flags;
 394
 395         scsi_host = scpnt->device->host;
 396         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
 397         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 398
 399         ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
 400                       scpnt, zfcp_get_busid_by_adapter(adapter));
 401
 402         /* avoid race condition between late normal completion and abort */
 403         write_lock_irqsave(&adapter->abort_lock, flags);
 404
 405         /*
 406          * Check whether command has just completed and can not be aborted.
 407          * Even if the command has just been completed late, we can access
 408          * scpnt since the SCSI stack does not release it at least until
 409          * this routine returns. (scpnt is parameter passed to this routine
 410          * and must not disappear during abort even on late completion.)
 411          */
 412         old_fsf_req = (struct zfcp_fsf_req *) scpnt->host_scribble;
 413         if (!old_fsf_req) {
 414                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 415                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, NULL);
 416                 retval = SUCCESS;
 417                 goto out;
 418         }
 419         old_fsf_req->data = 0;
 420         old_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
 421
 422         /* don't access old_fsf_req after releasing the abort_lock */
 423         write_unlock_irqrestore(&adapter->abort_lock, flags);
 424         /* call FSF routine which does the abort */
 425         new_fsf_req = zfcp_fsf_abort_fcp_command((unsigned long) old_fsf_req,
 426                                                  adapter, unit, 0);
 427         if (!new_fsf_req) {
 428                 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n");
 429                 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
 430                                           old_fsf_req);
 431                 retval = FAILED;
 432                 goto out;
 433         }
 434
 435         /* wait for completion of abort */
 436         __wait_event(new_fsf_req->completion_wq,
 437                      new_fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 438
 439         /* status should be valid since signals were not permitted */
 440         if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
 441                 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, new_fsf_req,
 442                                           NULL);
 443                 retval = SUCCESS;
 444         } else if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
 445                 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, new_fsf_req,
 446                                           NULL);
 447                 retval = SUCCESS;
 448         } else {
 449                 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, new_fsf_req,
 450                                           NULL);
 451                 retval = FAILED;
 452         }
 453         zfcp_fsf_req_free(new_fsf_req);
 454  out:
 455         return retval;
 456 }
 457
 458 int
 459 zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 460 {
 461         int retval;
 462         struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
 463
 464         if (!unit) {
 465                 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
 466                 retval = SUCCESS;
 467                 goto out;
 468         }
 469         ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun);
 470
 471         /*
 472          * If we do not know whether the unit supports 'logical unit reset'
 473          * then try 'logical unit reset' and proceed with 'target reset'
 474          * if 'logical unit reset' fails.
 475          * If the unit is known not to support 'logical unit reset' then
 476          * skip 'logical unit reset' and try 'target reset' immediately.
 477          */
 478         if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 479                               &unit->status)) {
 480                 retval = zfcp_task_management_function(unit,
 481                                                        FCP_LOGICAL_UNIT_RESET,
 482                                                        scpnt);
 483                 if (retval) {
 484                         ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit);
 485                         if (retval == -ENOTSUPP)
 486                                 atomic_set_mask
 487                                     (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 488                                      &unit->status);
 489                         /* fall through and try 'target reset' next */
 490                 } else {
 491                         ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n",
 492                                        unit);
 493                         /* avoid 'target reset' */
 494                         retval = SUCCESS;
 495                         goto out;
 496                 }
 497         }
 498         retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt);
 499         if (retval) {
 500                 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit);
 501                 retval = FAILED;
 502         } else {
 503                 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit);
 504                 retval = SUCCESS;
 505         }
 506  out:
 507         return retval;
 508 }
 509
 510 static int
 511 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags,
 512                               struct scsi_cmnd *scpnt)
 513 {
 514         struct zfcp_adapter *adapter = unit->port->adapter;
 515         struct zfcp_fsf_req *fsf_req;
 516         int retval = 0;
 517
 518         /* issue task management function */
 519         fsf_req = zfcp_fsf_send_fcp_command_task_management
 520                 (adapter, unit, tm_flags, 0);
 521         if (!fsf_req) {
 522                 ZFCP_LOG_INFO("error: creation of task management request "
 523                               "failed for unit 0x%016Lx on port 0x%016Lx on  "
 524                               "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
 525                               zfcp_get_busid_by_adapter(adapter));
 526                 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
 527                 retval = -ENOMEM;
 528                 goto out;
 529         }
 530
 531         __wait_event(fsf_req->completion_wq,
 532                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 533
 534         /*
 535          * check completion status of task management function
 536          */
 537         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 538                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
 539                 retval = -EIO;
 540         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
 541                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
 542                 retval = -ENOTSUPP;
 543         } else
 544                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
 545
 546         zfcp_fsf_req_free(fsf_req);
 547  out:
 548         return retval;
 549 }
 550
 551 /**
 552  * zfcp_scsi_eh_bus_reset_handler - reset bus (reopen adapter)
 553  */
 554 int
 555 zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *scpnt)
 556 {
 557         struct zfcp_unit *unit = (struct zfcp_unit*) scpnt->device->hostdata;
 558         struct zfcp_adapter *adapter = unit->port->adapter;
 559
 560         ZFCP_LOG_NORMAL("bus reset because of problems with "
 561                         "unit 0x%016Lx\n", unit->fcp_lun);
 562         zfcp_erp_adapter_reopen(adapter, 0);
 563         zfcp_erp_wait(adapter);
 564
 565         return SUCCESS;
 566 }
 567
 568 /**
 569  * zfcp_scsi_eh_host_reset_handler - reset host (reopen adapter)
 570  */
 571 int
 572 zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 573 {
 574         struct zfcp_unit *unit = (struct zfcp_unit*) scpnt->device->hostdata;
 575         struct zfcp_adapter *adapter = unit->port->adapter;
 576
 577         ZFCP_LOG_NORMAL("host reset because of problems with "
 578                         "unit 0x%016Lx\n", unit->fcp_lun);
 579         zfcp_erp_adapter_reopen(adapter, 0);
 580         zfcp_erp_wait(adapter);
 581
 582         return SUCCESS;
 583 }
 584
 585 int
 586 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 587 {
 588         int retval = 0;
 589         static unsigned int unique_id = 0;
 590
 591         /* register adapter as SCSI host with mid layer of SCSI stack */
 592         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 593                                              sizeof (struct zfcp_adapter *));
 594         if (!adapter->scsi_host) {
 595                 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
 596                                 "for adapter %s ",
 597                                 zfcp_get_busid_by_adapter(adapter));
 598                 retval = -EIO;
 599                 goto out;
 600         }
 601         ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
 602
 603         /* tell the SCSI stack some characteristics of this adapter */
 604         adapter->scsi_host->max_id = 1;
 605         adapter->scsi_host->max_lun = 1;
 606         adapter->scsi_host->max_channel = 0;
 607         adapter->scsi_host->unique_id = unique_id++;    /* FIXME */
 608         adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
 609         adapter->scsi_host->transportt = zfcp_transport_template;
 610
 611         /*
 612          * save a pointer to our own adapter data structure within
 613          * hostdata field of SCSI host data structure
 614          */
 615         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 616
 617         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 618                 scsi_host_put(adapter->scsi_host);
 619                 retval = -EIO;
 620                 goto out;
 621         }
 622         atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 623  out:
 624         return retval;
 625 }
 626
 627 void
 628 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 629 {
 630         struct Scsi_Host *shost;
 631         struct zfcp_port *port;
 632
 633         shost = adapter->scsi_host;
 634         if (!shost)
 635                 return;
 636         read_lock_irq(&zfcp_data.config_lock);
 637         list_for_each_entry(port, &adapter->port_list_head, list)
 638                 if (port->rport)
 639                         port->rport = NULL;
 640         read_unlock_irq(&zfcp_data.config_lock);
 641         fc_remove_host(shost);
 642         scsi_remove_host(shost);
 643         scsi_host_put(shost);
 644         adapter->scsi_host = NULL;
 645         atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 646
 647         return;
 648 }
 649
 650
 651 void
 652 zfcp_fsf_start_scsi_er_timer(struct zfcp_adapter *adapter)
 653 {
 654         adapter->scsi_er_timer.function = zfcp_fsf_scsi_er_timeout_handler;
 655         adapter->scsi_er_timer.data = (unsigned long) adapter;
 656         adapter->scsi_er_timer.expires = jiffies + ZFCP_SCSI_ER_TIMEOUT;
 657         add_timer(&adapter->scsi_er_timer);
 658 }
 659
 660 /*
 661  * Support functions for FC transport class
 662  */
 663 static struct fc_host_statistics*
 664 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 665 {
 666         struct fc_host_statistics *fc_stats;
 667
 668         if (!adapter->fc_stats) {
 669                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 670                 if (!fc_stats)
 671                         return NULL;
 672                 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
 673         }
 674         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 675         return adapter->fc_stats;
 676 }
 677
 678 static void
 679 zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 680                           struct fsf_qtcb_bottom_port *data,
 681                           struct fsf_qtcb_bottom_port *old)
 682 {
 683         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset -
 684                 old->seconds_since_last_reset;
 685         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 686         fc_stats->tx_words = data->tx_words - old->tx_words;
 687         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 688         fc_stats->rx_words = data->rx_words - old->rx_words;
 689         fc_stats->lip_count = data->lip - old->lip;
 690         fc_stats->nos_count = data->nos - old->nos;
 691         fc_stats->error_frames = data->error_frames - old->error_frames;
 692         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 693         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 694         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 695         fc_stats->loss_of_signal_count = data->loss_of_signal -
 696                 old->loss_of_signal;
 697         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts -
 698                 old->psp_error_counts;
 699         fc_stats->invalid_tx_word_count = data->invalid_tx_words -
 700                 old->invalid_tx_words;
 701         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 702         fc_stats->fcp_input_requests = data->input_requests -
 703                 old->input_requests;
 704         fc_stats->fcp_output_requests = data->output_requests -
 705                 old->output_requests;
 706         fc_stats->fcp_control_requests = data->control_requests -
 707                 old->control_requests;
 708         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 709         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 710 }
 711
 712 static void
 713 zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 714                        struct fsf_qtcb_bottom_port *data)
 715 {
 716         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 717         fc_stats->tx_frames = data->tx_frames;
 718         fc_stats->tx_words = data->tx_words;
 719         fc_stats->rx_frames = data->rx_frames;
 720         fc_stats->rx_words = data->rx_words;
 721         fc_stats->lip_count = data->lip;
 722         fc_stats->nos_count = data->nos;
 723         fc_stats->error_frames = data->error_frames;
 724         fc_stats->dumped_frames = data->dumped_frames;
 725         fc_stats->link_failure_count = data->link_failure;
 726         fc_stats->loss_of_sync_count = data->loss_of_sync;
 727         fc_stats->loss_of_signal_count = data->loss_of_signal;
 728         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 729         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 730         fc_stats->invalid_crc_count = data->invalid_crcs;
 731         fc_stats->fcp_input_requests = data->input_requests;
 732         fc_stats->fcp_output_requests = data->output_requests;
 733         fc_stats->fcp_control_requests = data->control_requests;
 734         fc_stats->fcp_input_megabytes = data->input_mb;
 735         fc_stats->fcp_output_megabytes = data->output_mb;
 736 }
 737
 738 /**
 739  * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc
 740  *
 741  * assumption: scsi_transport_fc synchronizes calls of
 742  *             get_fc_host_stats and reset_fc_host_stats
 743  *             (XXX to be checked otherwise introduce locking)
 744  */
 745 static struct fc_host_statistics *
 746 zfcp_get_fc_host_stats(struct Scsi_Host *shost)
 747 {
 748         struct zfcp_adapter *adapter;
 749         struct fc_host_statistics *fc_stats;
 750         struct fsf_qtcb_bottom_port *data;
 751         int ret;
 752
 753         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 754         fc_stats = zfcp_init_fc_host_stats(adapter);
 755         if (!fc_stats)
 756                 return NULL;
 757
 758         data = kzalloc(sizeof(*data), GFP_KERNEL);
 759         if (!data)
 760                 return NULL;
 761
 762         ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
 763         if (ret) {
 764                 kfree(data);
 765                 return NULL; /* XXX return zeroed fc_stats? */
 766         }
 767
 768         if (adapter->stats_reset &&
 769             ((jiffies/HZ - adapter->stats_reset) <
 770              data->seconds_since_last_reset)) {
 771                 zfcp_adjust_fc_host_stats(fc_stats, data,
 772                                           adapter->stats_reset_data);
 773         } else
 774                 zfcp_set_fc_host_stats(fc_stats, data);
 775
 776         kfree(data);
 777         return fc_stats;
 778 }
 779
 780 static void
 781 zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 782 {
 783         struct zfcp_adapter *adapter;
 784         struct fsf_qtcb_bottom_port *data, *old_data;
 785         int ret;
 786
 787         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 788         data = kzalloc(sizeof(*data), GFP_KERNEL);
 789         if (!data)
 790                 return;
 791
 792         ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
 793         if (ret == 0) {
 794                 adapter->stats_reset = jiffies/HZ;
 795                 old_data = adapter->stats_reset_data;
 796                 adapter->stats_reset_data = data; /* finally freed in
 797                                                      adater_dequeue */
 798                 kfree(old_data);
 799         }
 800 }
 801
 802 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 803 {
 804         rport->dev_loss_tmo = timeout;
 805 }
 806
 807 struct fc_function_template zfcp_transport_functions = {
 808         .show_starget_port_id = 1,
 809         .show_starget_port_name = 1,
 810         .show_starget_node_name = 1,
 811         .show_rport_supported_classes = 1,
 812         .show_rport_maxframe_size = 1,
 813         .show_rport_dev_loss_tmo = 1,
 814         .show_host_node_name = 1,
 815         .show_host_port_name = 1,
 816         .show_host_permanent_port_name = 1,
 817         .show_host_supported_classes = 1,
 818         .show_host_supported_speeds = 1,
 819         .show_host_maxframe_size = 1,
 820         .show_host_serial_number = 1,
 821         .get_fc_host_stats = zfcp_get_fc_host_stats,
 822         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 823         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 824         /* no functions registered for following dynamic attributes but
 825            directly set by LLDD */
 826         .show_host_port_type = 1,
 827         .show_host_speed = 1,
 828         .show_host_port_id = 1,
 829 };
 830
 831 /**
 832  * ZFCP_DEFINE_SCSI_ATTR
 833  * @_name:   name of show attribute
 834  * @_format: format string
 835  * @_value:  value to print
 836  *
 837  * Generates attribute for a unit.
 838  */
 839 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)                    \
 840 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr,        \
 841                                               char *buf)                 \
 842 {                                                                        \
 843         struct scsi_device *sdev;                                        \
 844         struct zfcp_unit *unit;                                          \
 845                                                                          \
 846         sdev = to_scsi_device(dev);                                      \
 847         unit = sdev->hostdata;                                           \
 848         return sprintf(buf, _format, _value);                            \
 849 }                                                                        \
 850                                                                          \
 851 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
 852
 853 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
 854 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
 855 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
 856
 857 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
 858         &dev_attr_fcp_lun,
 859         &dev_attr_wwpn,
 860         &dev_attr_hba_id,
 861         NULL
 862 };
 863
 864 #undef ZFCP_LOG_AREA