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
  49 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int, scsi_id_t,
  50                                           scsi_lun_t);
  51 static struct zfcp_port *zfcp_port_lookup(struct zfcp_adapter *, int,
  52                                           scsi_id_t);
  53
  54 static struct device_attribute *zfcp_sysfs_sdev_attrs[];
  55
  56 struct scsi_transport_template *zfcp_transport_template;
  57
  58 struct zfcp_data zfcp_data = {
  59         .scsi_host_template = {
  60               name:                    ZFCP_NAME,
  61               proc_name:               "zfcp",
  62               proc_info:               NULL,
  63               detect:                  NULL,
  64               slave_alloc:             zfcp_scsi_slave_alloc,
  65               slave_configure:         zfcp_scsi_slave_configure,
  66               slave_destroy:           zfcp_scsi_slave_destroy,
  67               queuecommand:            zfcp_scsi_queuecommand,
  68               eh_abort_handler:        zfcp_scsi_eh_abort_handler,
  69               eh_device_reset_handler: zfcp_scsi_eh_device_reset_handler,
  70               eh_bus_reset_handler:    zfcp_scsi_eh_bus_reset_handler,
  71               eh_host_reset_handler:   zfcp_scsi_eh_host_reset_handler,
  72                                        /* FIXME(openfcp): Tune */
  73               can_queue:               4096,
  74               this_id:                 0,
  75               /*
  76                * FIXME:
  77                * one less? can zfcp_create_sbale cope with it?
  78                */
  79               sg_tablesize:            ZFCP_MAX_SBALES_PER_REQ,
  80               cmd_per_lun:             1,
  81               unchecked_isa_dma:       0,
  82               use_clustering:          1,
  83               sdev_attrs:              zfcp_sysfs_sdev_attrs,
  84         },
  85         .driver_version = ZFCP_VERSION,
  86         /* rest initialised with zeros */
  87 };
  88
  89 /* Find start of Response Information in FCP response unit*/
  90 char *
  91 zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  92 {
  93         char *fcp_rsp_info_ptr;
  94
  95         fcp_rsp_info_ptr =
  96             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
  97
  98         return fcp_rsp_info_ptr;
  99 }
 100
 101 /* Find start of Sense Information in FCP response unit*/
 102 char *
 103 zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
 104 {
 105         char *fcp_sns_info_ptr;
 106
 107         fcp_sns_info_ptr =
 108             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
 109         if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
 110                 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr +
 111                     fcp_rsp_iu->fcp_rsp_len;
 112
 113         return fcp_sns_info_ptr;
 114 }
 115
 116 fcp_dl_t *
 117 zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd)
 118 {
 119         int additional_length = fcp_cmd->add_fcp_cdb_length << 2;
 120         fcp_dl_t *fcp_dl_addr;
 121
 122         fcp_dl_addr = (fcp_dl_t *)
 123                 ((unsigned char *) fcp_cmd +
 124                  sizeof (struct fcp_cmnd_iu) + additional_length);
 125         /*
 126          * fcp_dl_addr = start address of fcp_cmnd structure +
 127          * size of fixed part + size of dynamically sized add_dcp_cdb field
 128          * SEE FCP-2 documentation
 129          */
 130         return fcp_dl_addr;
 131 }
 132
 133 fcp_dl_t
 134 zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd)
 135 {
 136         return *zfcp_get_fcp_dl_ptr(fcp_cmd);
 137 }
 138
 139 void
 140 zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
 141 {
 142         *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl;
 143 }
 144
 145 /*
 146  * note: it's a bit-or operation not an assignment
 147  * regarding the specified byte
 148  */
 149 static inline void
 150 set_byte(u32 * result, char status, char pos)
 151 {
 152         *result |= status << (pos * 8);
 153 }
 154
 155 void
 156 set_host_byte(u32 * result, char status)
 157 {
 158         set_byte(result, status, 2);
 159 }
 160
 161 void
 162 set_driver_byte(u32 * result, char status)
 163 {
 164         set_byte(result, status, 3);
 165 }
 166
 167 /*
 168  * function:    zfcp_scsi_slave_alloc
 169  *
 170  * purpose:
 171  *
 172  * returns:
 173  */
 174
 175 static int
 176 zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 177 {
 178         struct zfcp_adapter *adapter;
 179         struct zfcp_unit *unit;
 180         unsigned long flags;
 181         int retval = -ENODEV;
 182
 183         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 184         if (!adapter)
 185                 goto out;
 186
 187         read_lock_irqsave(&zfcp_data.config_lock, flags);
 188         unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
 189         if (unit) {
 190                 sdp->hostdata = unit;
 191                 unit->device = sdp;
 192                 zfcp_unit_get(unit);
 193                 retval = 0;
 194         }
 195         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 196  out:
 197         return retval;
 198 }
 199
 200 /*
 201  * function:    zfcp_scsi_slave_destroy
 202  *
 203  * purpose:
 204  *
 205  * returns:
 206  */
 207
 208 static void
 209 zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
 210 {
 211         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
 212
 213         if (unit) {
 214                 sdpnt->hostdata = NULL;
 215                 unit->device = NULL;
 216                 zfcp_unit_put(unit);
 217         } else {
 218                 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at "
 219                                 "address %p\n", sdpnt);
 220         }
 221 }
 222
 223 /*
 224  * called from scsi midlayer to allow finetuning of a device.
 225  */
 226 static int
 227 zfcp_scsi_slave_configure(struct scsi_device *sdp)
 228 {
 229         if (sdp->tagged_supported)
 230                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN);
 231         else
 232                 scsi_adjust_queue_depth(sdp, 0, 1);
 233         return 0;
 234 }
 235
 236 /**
 237  * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function
 238  * @scpnt: pointer to struct scsi_cmnd where result is set
 239  * @result: result to be set in scpnt (e.g. DID_ERROR)
 240  */
 241 static void
 242 zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
 243 {
 244         set_host_byte(&scpnt->result, result);
 245         zfcp_cmd_dbf_event_scsi("failing", 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 static struct zfcp_port *
 406 zfcp_port_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id)
 407 {
 408         struct zfcp_port *port;
 409
 410         list_for_each_entry(port, &adapter->port_list_head, list) {
 411                 if (port->rport && (id == port->rport->scsi_target_id))
 412                         return port;
 413         }
 414         return (struct zfcp_port *) NULL;
 415 }
 416
 417 /**
 418  * zfcp_scsi_eh_abort_handler - abort the specified SCSI command
 419  * @scpnt: pointer to scsi_cmnd to be aborted
 420  * Return: SUCCESS - command has been aborted and cleaned up in internal
 421  *          bookkeeping, SCSI stack won't be called for aborted command
 422  *         FAILED - otherwise
 423  *
 424  * We do not need to care for a SCSI command which completes normally
 425  * but late during this abort routine runs.  We are allowed to return
 426  * late commands to the SCSI stack.  It tracks the state of commands and
 427  * will handle late commands.  (Usually, the normal completion of late
 428  * commands is ignored with respect to the running abort operation.)
 429  */
 430 int
 431 zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 432 {
 433         struct Scsi_Host *scsi_host;
 434         struct zfcp_adapter *adapter;
 435         struct zfcp_unit *unit;
 436         int retval = SUCCESS;
 437         struct zfcp_fsf_req *new_fsf_req, *old_fsf_req;
 438         unsigned long flags;
 439
 440         scsi_host = scpnt->device->host;
 441         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
 442         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 443
 444         ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
 445                       scpnt, zfcp_get_busid_by_adapter(adapter));
 446
 447         /* avoid race condition between late normal completion and abort */
 448         write_lock_irqsave(&adapter->abort_lock, flags);
 449
 450         /*
 451          * Check whether command has just completed and can not be aborted.
 452          * Even if the command has just been completed late, we can access
 453          * scpnt since the SCSI stack does not release it at least until
 454          * this routine returns. (scpnt is parameter passed to this routine
 455          * and must not disappear during abort even on late completion.)
 456          */
 457         old_fsf_req = (struct zfcp_fsf_req *) scpnt->host_scribble;
 458         if (!old_fsf_req) {
 459                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 460                 ZFCP_LOG_NORMAL("bug: no old fsf request found\n");
 461                 ZFCP_LOG_NORMAL("scsi_cmnd:\n");
 462                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
 463                               (char *) scpnt, sizeof (struct scsi_cmnd));
 464                 retval = FAILED;
 465                 goto out;
 466         }
 467         old_fsf_req->data = 0;
 468         old_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
 469
 470         /* don't access old_fsf_req after releasing the abort_lock */
 471         write_unlock_irqrestore(&adapter->abort_lock, flags);
 472         /* call FSF routine which does the abort */
 473         new_fsf_req = zfcp_fsf_abort_fcp_command((unsigned long) old_fsf_req,
 474                                                  adapter, unit, 0);
 475         if (!new_fsf_req) {
 476                 retval = FAILED;
 477                 ZFCP_LOG_NORMAL("error: initiation of Abort FCP Cmnd "
 478                                 "failed\n");
 479                 goto out;
 480         }
 481
 482         /* wait for completion of abort */
 483         __wait_event(new_fsf_req->completion_wq,
 484                      new_fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 485         zfcp_fsf_req_free(new_fsf_req);
 486
 487         /* status should be valid since signals were not permitted */
 488         if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
 489                 retval = SUCCESS;
 490         } else if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
 491                 retval = SUCCESS;
 492         } else {
 493                 retval = FAILED;
 494         }
 495  out:
 496         return retval;
 497 }
 498
 499 /*
 500  * function:    zfcp_scsi_eh_device_reset_handler
 501  *
 502  * purpose:
 503  *
 504  * returns:
 505  */
 506 int
 507 zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 508 {
 509         int retval;
 510         struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
 511
 512         if (!unit) {
 513                 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
 514                 retval = SUCCESS;
 515                 goto out;
 516         }
 517         ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun);
 518
 519         /*
 520          * If we do not know whether the unit supports 'logical unit reset'
 521          * then try 'logical unit reset' and proceed with 'target reset'
 522          * if 'logical unit reset' fails.
 523          * If the unit is known not to support 'logical unit reset' then
 524          * skip 'logical unit reset' and try 'target reset' immediately.
 525          */
 526         if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 527                               &unit->status)) {
 528                 retval =
 529                     zfcp_task_management_function(unit, FCP_LOGICAL_UNIT_RESET);
 530                 if (retval) {
 531                         ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit);
 532                         if (retval == -ENOTSUPP)
 533                                 atomic_set_mask
 534                                     (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 535                                      &unit->status);
 536                         /* fall through and try 'target reset' next */
 537                 } else {
 538                         ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n",
 539                                        unit);
 540                         /* avoid 'target reset' */
 541                         retval = SUCCESS;
 542                         goto out;
 543                 }
 544         }
 545         retval = zfcp_task_management_function(unit, FCP_TARGET_RESET);
 546         if (retval) {
 547                 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit);
 548                 retval = FAILED;
 549         } else {
 550                 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit);
 551                 retval = SUCCESS;
 552         }
 553  out:
 554         return retval;
 555 }
 556
 557 static int
 558 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags)
 559 {
 560         struct zfcp_adapter *adapter = unit->port->adapter;
 561         int retval;
 562         int status;
 563         struct zfcp_fsf_req *fsf_req;
 564
 565         /* issue task management function */
 566         fsf_req = zfcp_fsf_send_fcp_command_task_management
 567                 (adapter, unit, tm_flags, 0);
 568         if (!fsf_req) {
 569                 ZFCP_LOG_INFO("error: creation of task management request "
 570                               "failed for unit 0x%016Lx on port 0x%016Lx on  "
 571                               "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
 572                               zfcp_get_busid_by_adapter(adapter));
 573                 retval = -ENOMEM;
 574                 goto out;
 575         }
 576
 577         retval = zfcp_fsf_req_wait_and_cleanup(fsf_req,
 578                                                ZFCP_UNINTERRUPTIBLE, &status);
 579         /*
 580          * check completion status of task management function
 581          * (status should always be valid since no signals permitted)
 582          */
 583         if (status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED)
 584                 retval = -EIO;
 585         else if (status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP)
 586                 retval = -ENOTSUPP;
 587         else
 588                 retval = 0;
 589  out:
 590         return retval;
 591 }
 592
 593 /*
 594  * function:    zfcp_scsi_eh_bus_reset_handler
 595  *
 596  * purpose:
 597  *
 598  * returns:
 599  */
 600 int
 601 zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *scpnt)
 602 {
 603         int retval = 0;
 604         struct zfcp_unit *unit;
 605
 606         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 607         ZFCP_LOG_NORMAL("bus reset because of problems with "
 608                         "unit 0x%016Lx\n", unit->fcp_lun);
 609         zfcp_erp_adapter_reopen(unit->port->adapter, 0);
 610         zfcp_erp_wait(unit->port->adapter);
 611         retval = SUCCESS;
 612
 613         return retval;
 614 }
 615
 616 /*
 617  * function:    zfcp_scsi_eh_host_reset_handler
 618  *
 619  * purpose:
 620  *
 621  * returns:
 622  */
 623 int
 624 zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 625 {
 626         int retval = 0;
 627         struct zfcp_unit *unit;
 628
 629         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 630         ZFCP_LOG_NORMAL("host reset because of problems with "
 631                         "unit 0x%016Lx\n", unit->fcp_lun);
 632         zfcp_erp_adapter_reopen(unit->port->adapter, 0);
 633         zfcp_erp_wait(unit->port->adapter);
 634         retval = SUCCESS;
 635
 636         return retval;
 637 }
 638
 639 /*
 640  * function:
 641  *
 642  * purpose:
 643  *
 644  * returns:
 645  */
 646 int
 647 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 648 {
 649         int retval = 0;
 650         static unsigned int unique_id = 0;
 651
 652         /* register adapter as SCSI host with mid layer of SCSI stack */
 653         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 654                                              sizeof (struct zfcp_adapter *));
 655         if (!adapter->scsi_host) {
 656                 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
 657                                 "for adapter %s ",
 658                                 zfcp_get_busid_by_adapter(adapter));
 659                 retval = -EIO;
 660                 goto out;
 661         }
 662         ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
 663
 664         /* tell the SCSI stack some characteristics of this adapter */
 665         adapter->scsi_host->max_id = 1;
 666         adapter->scsi_host->max_lun = 1;
 667         adapter->scsi_host->max_channel = 0;
 668         adapter->scsi_host->unique_id = unique_id++;    /* FIXME */
 669         adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
 670         adapter->scsi_host->transportt = zfcp_transport_template;
 671         /*
 672          * Reverse mapping of the host number to avoid race condition
 673          */
 674         adapter->scsi_host_no = adapter->scsi_host->host_no;
 675
 676         /*
 677          * save a pointer to our own adapter data structure within
 678          * hostdata field of SCSI host data structure
 679          */
 680         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 681
 682         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 683                 scsi_host_put(adapter->scsi_host);
 684                 retval = -EIO;
 685                 goto out;
 686         }
 687         atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 688  out:
 689         return retval;
 690 }
 691
 692 /*
 693  * function:
 694  *
 695  * purpose:
 696  *
 697  * returns:
 698  */
 699 void
 700 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 701 {
 702         struct Scsi_Host *shost;
 703
 704         shost = adapter->scsi_host;
 705         if (!shost)
 706                 return;
 707         fc_remove_host(shost);
 708         scsi_remove_host(shost);
 709         scsi_host_put(shost);
 710         adapter->scsi_host = NULL;
 711         adapter->scsi_host_no = 0;
 712         atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 713
 714         return;
 715 }
 716
 717
 718 void
 719 zfcp_fsf_start_scsi_er_timer(struct zfcp_adapter *adapter)
 720 {
 721         adapter->scsi_er_timer.function = zfcp_fsf_scsi_er_timeout_handler;
 722         adapter->scsi_er_timer.data = (unsigned long) adapter;
 723         adapter->scsi_er_timer.expires = jiffies + ZFCP_SCSI_ER_TIMEOUT;
 724         add_timer(&adapter->scsi_er_timer);
 725 }
 726
 727 /*
 728  * Support functions for FC transport class
 729  */
 730 static void
 731 zfcp_get_port_id(struct scsi_target *starget)
 732 {
 733         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 734         struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0];
 735         struct zfcp_port *port;
 736         unsigned long flags;
 737
 738         read_lock_irqsave(&zfcp_data.config_lock, flags);
 739         port = zfcp_port_lookup(adapter, starget->channel, starget->id);
 740         if (port)
 741                 fc_starget_port_id(starget) = port->d_id;
 742         else
 743                 fc_starget_port_id(starget) = -1;
 744         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 745 }
 746
 747 static void
 748 zfcp_get_port_name(struct scsi_target *starget)
 749 {
 750         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 751         struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0];
 752         struct zfcp_port *port;
 753         unsigned long flags;
 754
 755         read_lock_irqsave(&zfcp_data.config_lock, flags);
 756         port = zfcp_port_lookup(adapter, starget->channel, starget->id);
 757         if (port)
 758                 fc_starget_port_name(starget) = port->wwpn;
 759         else
 760                 fc_starget_port_name(starget) = -1;
 761         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 762 }
 763
 764 static void
 765 zfcp_get_node_name(struct scsi_target *starget)
 766 {
 767         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 768         struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0];
 769         struct zfcp_port *port;
 770         unsigned long flags;
 771
 772         read_lock_irqsave(&zfcp_data.config_lock, flags);
 773         port = zfcp_port_lookup(adapter, starget->channel, starget->id);
 774         if (port)
 775                 fc_starget_node_name(starget) = port->wwnn;
 776         else
 777                 fc_starget_node_name(starget) = -1;
 778         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 779 }
 780
 781 void
 782 zfcp_set_fc_host_attrs(struct zfcp_adapter *adapter)
 783 {
 784         struct Scsi_Host *shost = adapter->scsi_host;
 785
 786         fc_host_node_name(shost) = adapter->wwnn;
 787         fc_host_port_name(shost) = adapter->wwpn;
 788         strncpy(fc_host_serial_number(shost), adapter->serial_number,
 789                 min(FC_SERIAL_NUMBER_SIZE, 32));
 790         fc_host_supported_classes(shost) = FC_COS_CLASS2 | FC_COS_CLASS3;
 791 }
 792
 793 struct fc_function_template zfcp_transport_functions = {
 794         .get_starget_port_id = zfcp_get_port_id,
 795         .get_starget_port_name = zfcp_get_port_name,
 796         .get_starget_node_name = zfcp_get_node_name,
 797         .show_starget_port_id = 1,
 798         .show_starget_port_name = 1,
 799         .show_starget_node_name = 1,
 800         .show_rport_supported_classes = 1,
 801         .show_host_node_name = 1,
 802         .show_host_port_name = 1,
 803         .show_host_supported_classes = 1,
 804         .show_host_serial_number = 1,
 805 };
 806
 807 /**
 808  * ZFCP_DEFINE_SCSI_ATTR
 809  * @_name:   name of show attribute
 810  * @_format: format string
 811  * @_value:  value to print
 812  *
 813  * Generates attribute for a unit.
 814  */
 815 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)                    \
 816 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr,        \
 817                                               char *buf)                 \
 818 {                                                                        \
 819         struct scsi_device *sdev;                                        \
 820         struct zfcp_unit *unit;                                          \
 821                                                                          \
 822         sdev = to_scsi_device(dev);                                      \
 823         unit = sdev->hostdata;                                           \
 824         return sprintf(buf, _format, _value);                            \
 825 }                                                                        \
 826                                                                          \
 827 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
 828
 829 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
 830 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
 831 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
 832
 833 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
 834         &dev_attr_fcp_lun,
 835         &dev_attr_wwpn,
 836         &dev_attr_hba_id,
 837         NULL
 838 };
 839
 840 #undef ZFCP_LOG_AREA