SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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                                        /* FIXME(openfcp): Tune */
  60               can_queue:               4096,
  61               this_id:                 -1,
  62               /*
  63                * FIXME:
  64                * one less? can zfcp_create_sbale cope with it?
  65                */
  66               sg_tablesize:            ZFCP_MAX_SBALES_PER_REQ,
  67               cmd_per_lun:             1,
  68               unchecked_isa_dma:       0,
  69               use_clustering:          1,
  70               sdev_attrs:              zfcp_sysfs_sdev_attrs,
  71         },
  72         .driver_version = ZFCP_VERSION,
  73         /* rest initialised with zeros */
  74 };
  75
  76 /* Find start of Response Information in FCP response unit*/
  77 char *
  78 zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  79 {
  80         char *fcp_rsp_info_ptr;
  81
  82         fcp_rsp_info_ptr =
  83             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
  84
  85         return fcp_rsp_info_ptr;
  86 }
  87
  88 /* Find start of Sense Information in FCP response unit*/
  89 char *
  90 zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  91 {
  92         char *fcp_sns_info_ptr;
  93
  94         fcp_sns_info_ptr =
  95             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
  96         if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
  97                 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr +
  98                     fcp_rsp_iu->fcp_rsp_len;
  99
 100         return fcp_sns_info_ptr;
 101 }
 102
 103 fcp_dl_t *
 104 zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd)
 105 {
 106         int additional_length = fcp_cmd->add_fcp_cdb_length << 2;
 107         fcp_dl_t *fcp_dl_addr;
 108
 109         fcp_dl_addr = (fcp_dl_t *)
 110                 ((unsigned char *) fcp_cmd +
 111                  sizeof (struct fcp_cmnd_iu) + additional_length);
 112         /*
 113          * fcp_dl_addr = start address of fcp_cmnd structure +
 114          * size of fixed part + size of dynamically sized add_dcp_cdb field
 115          * SEE FCP-2 documentation
 116          */
 117         return fcp_dl_addr;
 118 }
 119
 120 fcp_dl_t
 121 zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd)
 122 {
 123         return *zfcp_get_fcp_dl_ptr(fcp_cmd);
 124 }
 125
 126 void
 127 zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
 128 {
 129         *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl;
 130 }
 131
 132 /*
 133  * note: it's a bit-or operation not an assignment
 134  * regarding the specified byte
 135  */
 136 static inline void
 137 set_byte(u32 * result, char status, char pos)
 138 {
 139         *result |= status << (pos * 8);
 140 }
 141
 142 void
 143 set_host_byte(u32 * result, char status)
 144 {
 145         set_byte(result, status, 2);
 146 }
 147
 148 void
 149 set_driver_byte(u32 * result, char status)
 150 {
 151         set_byte(result, status, 3);
 152 }
 153
 154 static int
 155 zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 156 {
 157         struct zfcp_adapter *adapter;
 158         struct zfcp_unit *unit;
 159         unsigned long flags;
 160         int retval = -ENXIO;
 161
 162         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 163         if (!adapter)
 164                 goto out;
 165
 166         read_lock_irqsave(&zfcp_data.config_lock, flags);
 167         unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
 168         if (unit && atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED,
 169                                      &unit->status)) {
 170                 sdp->hostdata = unit;
 171                 unit->device = sdp;
 172                 zfcp_unit_get(unit);
 173                 retval = 0;
 174         }
 175         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 176  out:
 177         return retval;
 178 }
 179
 180 static void
 181 zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
 182 {
 183         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
 184
 185         if (unit) {
 186                 atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status);
 187                 sdpnt->hostdata = NULL;
 188                 unit->device = NULL;
 189                 zfcp_unit_put(unit);
 190         } else {
 191                 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at "
 192                                 "address %p\n", sdpnt);
 193         }
 194 }
 195
 196 /*
 197  * called from scsi midlayer to allow finetuning of a device.
 198  */
 199 static int
 200 zfcp_scsi_slave_configure(struct scsi_device *sdp)
 201 {
 202         if (sdp->tagged_supported)
 203                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN);
 204         else
 205                 scsi_adjust_queue_depth(sdp, 0, 1);
 206         return 0;
 207 }
 208
 209 /**
 210  * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function
 211  * @scpnt: pointer to struct scsi_cmnd where result is set
 212  * @result: result to be set in scpnt (e.g. DID_ERROR)
 213  */
 214 static void
 215 zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
 216 {
 217         set_host_byte(&scpnt->result, result);
 218         if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
 219                 zfcp_scsi_dbf_event_result("fail", 4,
 220                         (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
 221                         scpnt, NULL);
 222         /* return directly */
 223         scpnt->scsi_done(scpnt);
 224 }
 225
 226 /**
 227  * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and
 228  *      zfcp_scsi_command_sync
 229  * @adapter: adapter where scsi command is issued
 230  * @unit: unit to which scsi command is sent
 231  * @scpnt: scsi command to be sent
 232  * @timer: timer to be started if request is successfully initiated
 233  *
 234  * Note: In scsi_done function must be set in scpnt.
 235  */
 236 int
 237 zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit,
 238                         struct scsi_cmnd *scpnt, struct timer_list *timer)
 239 {
 240         int tmp;
 241         int retval;
 242
 243         retval = 0;
 244
 245         BUG_ON((adapter == NULL) || (adapter != unit->port->adapter));
 246         BUG_ON(scpnt->scsi_done == NULL);
 247
 248         if (unlikely(NULL == unit)) {
 249                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
 250                 goto out;
 251         }
 252
 253         if (unlikely(
 254               atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) ||
 255              !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) {
 256                 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port "
 257                                "0x%016Lx on adapter %s\n",
 258                                unit->fcp_lun, unit->port->wwpn,
 259                                zfcp_get_busid_by_adapter(adapter));
 260                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 261                 goto out;
 262         }
 263
 264         if (unlikely(
 265              !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) {
 266                 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx "
 267                                "on port 0x%016Lx in recovery\n",
 268                                zfcp_get_busid_by_unit(unit),
 269                                unit->fcp_lun, unit->port->wwpn);
 270                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
 271                 goto out;
 272         }
 273
 274         tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, timer,
 275                                              ZFCP_REQ_AUTO_CLEANUP);
 276
 277         if (unlikely(tmp < 0)) {
 278                 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n");
 279                 retval = SCSI_MLQUEUE_HOST_BUSY;
 280         }
 281
 282 out:
 283         return retval;
 284 }
 285
 286 void
 287 zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt)
 288 {
 289         struct completion *wait = (struct completion *) scpnt->SCp.ptr;
 290         complete(wait);
 291 }
 292
 293
 294 /**
 295  * zfcp_scsi_command_sync - send a SCSI command and wait for completion
 296  * @unit: unit where command is sent to
 297  * @scpnt: scsi command to be sent
 298  * @timer: timer to be started if request is successfully initiated
 299  * Return: 0
 300  *
 301  * Errors are indicated in scpnt->result
 302  */
 303 int
 304 zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt,
 305                        struct timer_list *timer)
 306 {
 307         int ret;
 308         DECLARE_COMPLETION(wait);
 309
 310         scpnt->SCp.ptr = (void *) &wait;  /* silent re-use */
 311         scpnt->scsi_done = zfcp_scsi_command_sync_handler;
 312         ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, timer);
 313         if (ret == 0)
 314                 wait_for_completion(&wait);
 315
 316         scpnt->SCp.ptr = NULL;
 317
 318         return 0;
 319 }
 320
 321 /*
 322  * function:    zfcp_scsi_queuecommand
 323  *
 324  * purpose:     enqueues a SCSI command to the specified target device
 325  *
 326  * returns:     0 - success, SCSI command enqueued
 327  *              !0 - failure
 328  */
 329 int
 330 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
 331                        void (*done) (struct scsi_cmnd *))
 332 {
 333         struct zfcp_unit *unit;
 334         struct zfcp_adapter *adapter;
 335
 336         /* reset the status for this request */
 337         scpnt->result = 0;
 338         scpnt->host_scribble = NULL;
 339         scpnt->scsi_done = done;
 340
 341         /*
 342          * figure out adapter and target device
 343          * (stored there by zfcp_scsi_slave_alloc)
 344          */
 345         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
 346         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 347
 348         return zfcp_scsi_command_async(adapter, unit, scpnt, NULL);
 349 }
 350
 351 static struct zfcp_unit *
 352 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, unsigned int id,
 353                  unsigned int lun)
 354 {
 355         struct zfcp_port *port;
 356         struct zfcp_unit *unit, *retval = NULL;
 357
 358         list_for_each_entry(port, &adapter->port_list_head, list) {
 359                 if (!port->rport || (id != port->rport->scsi_target_id))
 360                         continue;
 361                 list_for_each_entry(unit, &port->unit_list_head, list) {
 362                         if (lun == unit->scsi_lun) {
 363                                 retval = unit;
 364                                 goto out;
 365                         }
 366                 }
 367         }
 368  out:
 369         return retval;
 370 }
 371
 372 /**
 373  * zfcp_scsi_eh_abort_handler - abort the specified SCSI command
 374  * @scpnt: pointer to scsi_cmnd to be aborted
 375  * Return: SUCCESS - command has been aborted and cleaned up in internal
 376  *          bookkeeping, SCSI stack won't be called for aborted command
 377  *         FAILED - otherwise
 378  *
 379  * We do not need to care for a SCSI command which completes normally
 380  * but late during this abort routine runs.  We are allowed to return
 381  * late commands to the SCSI stack.  It tracks the state of commands and
 382  * will handle late commands.  (Usually, the normal completion of late
 383  * commands is ignored with respect to the running abort operation.)
 384  */
 385 int
 386 zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 387 {
 388         struct Scsi_Host *scsi_host;
 389         struct zfcp_adapter *adapter;
 390         struct zfcp_unit *unit;
 391         int retval = SUCCESS;
 392         struct zfcp_fsf_req *new_fsf_req = NULL;
 393         struct zfcp_fsf_req *old_fsf_req;
 394         unsigned long flags;
 395
 396         scsi_host = scpnt->device->host;
 397         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
 398         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 399
 400         ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
 401                       scpnt, zfcp_get_busid_by_adapter(adapter));
 402
 403         /* avoid race condition between late normal completion and abort */
 404         write_lock_irqsave(&adapter->abort_lock, flags);
 405
 406         /*
 407          * Check whether command has just completed and can not be aborted.
 408          * Even if the command has just been completed late, we can access
 409          * scpnt since the SCSI stack does not release it at least until
 410          * this routine returns. (scpnt is parameter passed to this routine
 411          * and must not disappear during abort even on late completion.)
 412          */
 413         old_fsf_req = (struct zfcp_fsf_req *) scpnt->host_scribble;
 414         if (!old_fsf_req) {
 415                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 416                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, NULL);
 417                 retval = SUCCESS;
 418                 goto out;
 419         }
 420         old_fsf_req->data = 0;
 421         old_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
 422
 423         /* don't access old_fsf_req after releasing the abort_lock */
 424         write_unlock_irqrestore(&adapter->abort_lock, flags);
 425         /* call FSF routine which does the abort */
 426         new_fsf_req = zfcp_fsf_abort_fcp_command((unsigned long) old_fsf_req,
 427                                                  adapter, unit, 0);
 428         if (!new_fsf_req) {
 429                 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n");
 430                 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
 431                                           old_fsf_req);
 432                 retval = FAILED;
 433                 goto out;
 434         }
 435
 436         /* wait for completion of abort */
 437         __wait_event(new_fsf_req->completion_wq,
 438                      new_fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 439
 440         /* status should be valid since signals were not permitted */
 441         if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
 442                 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, new_fsf_req,
 443                                           NULL);
 444                 retval = SUCCESS;
 445         } else if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
 446                 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, new_fsf_req,
 447                                           NULL);
 448                 retval = SUCCESS;
 449         } else {
 450                 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, new_fsf_req,
 451                                           NULL);
 452                 retval = FAILED;
 453         }
 454         zfcp_fsf_req_free(new_fsf_req);
 455  out:
 456         return retval;
 457 }
 458
 459 int
 460 zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 461 {
 462         int retval;
 463         struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
 464
 465         if (!unit) {
 466                 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
 467                 retval = SUCCESS;
 468                 goto out;
 469         }
 470         ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun);
 471
 472         /*
 473          * If we do not know whether the unit supports 'logical unit reset'
 474          * then try 'logical unit reset' and proceed with 'target reset'
 475          * if 'logical unit reset' fails.
 476          * If the unit is known not to support 'logical unit reset' then
 477          * skip 'logical unit reset' and try 'target reset' immediately.
 478          */
 479         if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 480                               &unit->status)) {
 481                 retval = zfcp_task_management_function(unit,
 482                                                        FCP_LOGICAL_UNIT_RESET,
 483                                                        scpnt);
 484                 if (retval) {
 485                         ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit);
 486                         if (retval == -ENOTSUPP)
 487                                 atomic_set_mask
 488                                     (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 489                                      &unit->status);
 490                         /* fall through and try 'target reset' next */
 491                 } else {
 492                         ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n",
 493                                        unit);
 494                         /* avoid 'target reset' */
 495                         retval = SUCCESS;
 496                         goto out;
 497                 }
 498         }
 499         retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt);
 500         if (retval) {
 501                 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit);
 502                 retval = FAILED;
 503         } else {
 504                 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit);
 505                 retval = SUCCESS;
 506         }
 507  out:
 508         return retval;
 509 }
 510
 511 static int
 512 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags,
 513                               struct scsi_cmnd *scpnt)
 514 {
 515         struct zfcp_adapter *adapter = unit->port->adapter;
 516         struct zfcp_fsf_req *fsf_req;
 517         int retval = 0;
 518
 519         /* issue task management function */
 520         fsf_req = zfcp_fsf_send_fcp_command_task_management
 521                 (adapter, unit, tm_flags, 0);
 522         if (!fsf_req) {
 523                 ZFCP_LOG_INFO("error: creation of task management request "
 524                               "failed for unit 0x%016Lx on port 0x%016Lx on  "
 525                               "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
 526                               zfcp_get_busid_by_adapter(adapter));
 527                 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
 528                 retval = -ENOMEM;
 529                 goto out;
 530         }
 531
 532         __wait_event(fsf_req->completion_wq,
 533                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 534
 535         /*
 536          * check completion status of task management function
 537          */
 538         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 539                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
 540                 retval = -EIO;
 541         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
 542                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
 543                 retval = -ENOTSUPP;
 544         } else
 545                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
 546
 547         zfcp_fsf_req_free(fsf_req);
 548  out:
 549         return retval;
 550 }
 551
 552 /**
 553  * zfcp_scsi_eh_bus_reset_handler - reset bus (reopen adapter)
 554  */
 555 int
 556 zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *scpnt)
 557 {
 558         struct zfcp_unit *unit = (struct zfcp_unit*) scpnt->device->hostdata;
 559         struct zfcp_adapter *adapter = unit->port->adapter;
 560
 561         ZFCP_LOG_NORMAL("bus reset because of problems with "
 562                         "unit 0x%016Lx\n", unit->fcp_lun);
 563         zfcp_erp_adapter_reopen(adapter, 0);
 564         zfcp_erp_wait(adapter);
 565
 566         return SUCCESS;
 567 }
 568
 569 /**
 570  * zfcp_scsi_eh_host_reset_handler - reset host (reopen adapter)
 571  */
 572 int
 573 zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 574 {
 575         struct zfcp_unit *unit = (struct zfcp_unit*) scpnt->device->hostdata;
 576         struct zfcp_adapter *adapter = unit->port->adapter;
 577
 578         ZFCP_LOG_NORMAL("host reset because of problems with "
 579                         "unit 0x%016Lx\n", unit->fcp_lun);
 580         zfcp_erp_adapter_reopen(adapter, 0);
 581         zfcp_erp_wait(adapter);
 582
 583         return SUCCESS;
 584 }
 585
 586 int
 587 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 588 {
 589         int retval = 0;
 590         static unsigned int unique_id = 0;
 591
 592         /* register adapter as SCSI host with mid layer of SCSI stack */
 593         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 594                                              sizeof (struct zfcp_adapter *));
 595         if (!adapter->scsi_host) {
 596                 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
 597                                 "for adapter %s ",
 598                                 zfcp_get_busid_by_adapter(adapter));
 599                 retval = -EIO;
 600                 goto out;
 601         }
 602         ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
 603
 604         /* tell the SCSI stack some characteristics of this adapter */
 605         adapter->scsi_host->max_id = 1;
 606         adapter->scsi_host->max_lun = 1;
 607         adapter->scsi_host->max_channel = 0;
 608         adapter->scsi_host->unique_id = unique_id++;    /* FIXME */
 609         adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
 610         adapter->scsi_host->transportt = zfcp_transport_template;
 611
 612         /*
 613          * save a pointer to our own adapter data structure within
 614          * hostdata field of SCSI host data structure
 615          */
 616         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 617
 618         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 619                 scsi_host_put(adapter->scsi_host);
 620                 retval = -EIO;
 621                 goto out;
 622         }
 623         atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 624  out:
 625         return retval;
 626 }
 627
 628 void
 629 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 630 {
 631         struct Scsi_Host *shost;
 632         struct zfcp_port *port;
 633
 634         shost = adapter->scsi_host;
 635         if (!shost)
 636                 return;
 637         read_lock_irq(&zfcp_data.config_lock);
 638         list_for_each_entry(port, &adapter->port_list_head, list)
 639                 if (port->rport)
 640                         port->rport = NULL;
 641         read_unlock_irq(&zfcp_data.config_lock);
 642         fc_remove_host(shost);
 643         scsi_remove_host(shost);
 644         scsi_host_put(shost);
 645         adapter->scsi_host = NULL;
 646         atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 647
 648         return;
 649 }
 650
 651
 652 void
 653 zfcp_fsf_start_scsi_er_timer(struct zfcp_adapter *adapter)
 654 {
 655         adapter->scsi_er_timer.function = zfcp_fsf_scsi_er_timeout_handler;
 656         adapter->scsi_er_timer.data = (unsigned long) adapter;
 657         adapter->scsi_er_timer.expires = jiffies + ZFCP_SCSI_ER_TIMEOUT;
 658         add_timer(&adapter->scsi_er_timer);
 659 }
 660
 661 /*
 662  * Support functions for FC transport class
 663  */
 664 static struct fc_host_statistics*
 665 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 666 {
 667         struct fc_host_statistics *fc_stats;
 668
 669         if (!adapter->fc_stats) {
 670                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 671                 if (!fc_stats)
 672                         return NULL;
 673                 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
 674         }
 675         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 676         return adapter->fc_stats;
 677 }
 678
 679 static void
 680 zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 681                           struct fsf_qtcb_bottom_port *data,
 682                           struct fsf_qtcb_bottom_port *old)
 683 {
 684         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset -
 685                 old->seconds_since_last_reset;
 686         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 687         fc_stats->tx_words = data->tx_words - old->tx_words;
 688         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 689         fc_stats->rx_words = data->rx_words - old->rx_words;
 690         fc_stats->lip_count = data->lip - old->lip;
 691         fc_stats->nos_count = data->nos - old->nos;
 692         fc_stats->error_frames = data->error_frames - old->error_frames;
 693         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 694         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 695         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 696         fc_stats->loss_of_signal_count = data->loss_of_signal -
 697                 old->loss_of_signal;
 698         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts -
 699                 old->psp_error_counts;
 700         fc_stats->invalid_tx_word_count = data->invalid_tx_words -
 701                 old->invalid_tx_words;
 702         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 703         fc_stats->fcp_input_requests = data->input_requests -
 704                 old->input_requests;
 705         fc_stats->fcp_output_requests = data->output_requests -
 706                 old->output_requests;
 707         fc_stats->fcp_control_requests = data->control_requests -
 708                 old->control_requests;
 709         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 710         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 711 }
 712
 713 static void
 714 zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 715                        struct fsf_qtcb_bottom_port *data)
 716 {
 717         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 718         fc_stats->tx_frames = data->tx_frames;
 719         fc_stats->tx_words = data->tx_words;
 720         fc_stats->rx_frames = data->rx_frames;
 721         fc_stats->rx_words = data->rx_words;
 722         fc_stats->lip_count = data->lip;
 723         fc_stats->nos_count = data->nos;
 724         fc_stats->error_frames = data->error_frames;
 725         fc_stats->dumped_frames = data->dumped_frames;
 726         fc_stats->link_failure_count = data->link_failure;
 727         fc_stats->loss_of_sync_count = data->loss_of_sync;
 728         fc_stats->loss_of_signal_count = data->loss_of_signal;
 729         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 730         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 731         fc_stats->invalid_crc_count = data->invalid_crcs;
 732         fc_stats->fcp_input_requests = data->input_requests;
 733         fc_stats->fcp_output_requests = data->output_requests;
 734         fc_stats->fcp_control_requests = data->control_requests;
 735         fc_stats->fcp_input_megabytes = data->input_mb;
 736         fc_stats->fcp_output_megabytes = data->output_mb;
 737 }
 738
 739 /**
 740  * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc
 741  *
 742  * assumption: scsi_transport_fc synchronizes calls of
 743  *             get_fc_host_stats and reset_fc_host_stats
 744  *             (XXX to be checked otherwise introduce locking)
 745  */
 746 static struct fc_host_statistics *
 747 zfcp_get_fc_host_stats(struct Scsi_Host *shost)
 748 {
 749         struct zfcp_adapter *adapter;
 750         struct fc_host_statistics *fc_stats;
 751         struct fsf_qtcb_bottom_port *data;
 752         int ret;
 753
 754         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 755         fc_stats = zfcp_init_fc_host_stats(adapter);
 756         if (!fc_stats)
 757                 return NULL;
 758
 759         data = kzalloc(sizeof(*data), GFP_KERNEL);
 760         if (!data)
 761                 return NULL;
 762
 763         ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
 764         if (ret) {
 765                 kfree(data);
 766                 return NULL; /* XXX return zeroed fc_stats? */
 767         }
 768
 769         if (adapter->stats_reset &&
 770             ((jiffies/HZ - adapter->stats_reset) <
 771              data->seconds_since_last_reset)) {
 772                 zfcp_adjust_fc_host_stats(fc_stats, data,
 773                                           adapter->stats_reset_data);
 774         } else
 775                 zfcp_set_fc_host_stats(fc_stats, data);
 776
 777         kfree(data);
 778         return fc_stats;
 779 }
 780
 781 static void
 782 zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 783 {
 784         struct zfcp_adapter *adapter;
 785         struct fsf_qtcb_bottom_port *data, *old_data;
 786         int ret;
 787
 788         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 789         data = kzalloc(sizeof(*data), GFP_KERNEL);
 790         if (!data)
 791                 return;
 792
 793         ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
 794         if (ret == 0) {
 795                 adapter->stats_reset = jiffies/HZ;
 796                 old_data = adapter->stats_reset_data;
 797                 adapter->stats_reset_data = data; /* finally freed in
 798                                                      adater_dequeue */
 799                 kfree(old_data);
 800         }
 801 }
 802
 803 struct fc_function_template zfcp_transport_functions = {
 804         .show_starget_port_id = 1,
 805         .show_starget_port_name = 1,
 806         .show_starget_node_name = 1,
 807         .show_rport_supported_classes = 1,
 808         .show_rport_maxframe_size = 1,
 809         .show_host_node_name = 1,
 810         .show_host_port_name = 1,
 811         .show_host_permanent_port_name = 1,
 812         .show_host_supported_classes = 1,
 813         .show_host_supported_speeds = 1,
 814         .show_host_maxframe_size = 1,
 815         .show_host_serial_number = 1,
 816         .get_fc_host_stats = zfcp_get_fc_host_stats,
 817         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 818         /* no functions registered for following dynamic attributes but
 819            directly set by LLDD */
 820         .show_host_port_type = 1,
 821         .show_host_speed = 1,
 822         .show_host_port_id = 1,
 823 };
 824
 825 /**
 826  * ZFCP_DEFINE_SCSI_ATTR
 827  * @_name:   name of show attribute
 828  * @_format: format string
 829  * @_value:  value to print
 830  *
 831  * Generates attribute for a unit.
 832  */
 833 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)                    \
 834 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr,        \
 835                                               char *buf)                 \
 836 {                                                                        \
 837         struct scsi_device *sdev;                                        \
 838         struct zfcp_unit *unit;                                          \
 839                                                                          \
 840         sdev = to_scsi_device(dev);                                      \
 841         unit = sdev->hostdata;                                           \
 842         return sprintf(buf, _format, _value);                            \
 843 }                                                                        \
 844                                                                          \
 845 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
 846
 847 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
 848 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
 849 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
 850
 851 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
 852         &dev_attr_fcp_lun,
 853         &dev_attr_wwpn,
 854         &dev_attr_hba_id,
 855         NULL
 856 };
 857
 858 #undef ZFCP_LOG_AREA