drivers/s390/scsi/zfcp_scsi.c

   1 /*
   2  *
   3  * linux/drivers/s390/scsi/zfcp_scsi.c
   4  *
   5  * FCP adapter driver for IBM eServer zSeries
   6  *
   7  * (C) Copyright IBM Corp. 2002, 2004
   8  *
   9  * Author(s): Martin Peschke <mpeschke@de.ibm.com>
  10  *            Raimund Schroeder <raimund.schroeder@de.ibm.com>
  11  *            Aron Zeh
  12  *            Wolfgang Taphorn
  13  *            Stefan Bader <stefan.bader@de.ibm.com>
  14  *            Heiko Carstens <heiko.carstens@de.ibm.com>
  15  *            Andreas Herrmann <aherrman@de.ibm.com>
  16  *
  17  * This program is free software; you can redistribute it and/or modify
  18  * it under the terms of the GNU General Public License as published by
  19  * the Free Software Foundation; either version 2, or (at your option)
  20  * any later version.
  21  *
  22  * This program is distributed in the hope that it will be useful,
  23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  * GNU General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program; if not, write to the Free Software
  29  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  30  */
  31
  32 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_SCSI
  33
  34 #include "zfcp_ext.h"
  35
  36 static void zfcp_scsi_slave_destroy(struct scsi_device *sdp);
  37 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp);
  38 static int zfcp_scsi_slave_configure(struct scsi_device *sdp);
  39 static int zfcp_scsi_queuecommand(struct scsi_cmnd *,
  40                                   void (*done) (struct scsi_cmnd *));
  41 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *);
  42 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *);
  43 static int zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *);
  44 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *);
  45 static int zfcp_task_management_function(struct zfcp_unit *, u8,
  46                                          struct scsi_cmnd *);
  47
  48 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int, scsi_id_t,
  49                                           scsi_lun_t);
  50
  51 static struct device_attribute *zfcp_sysfs_sdev_attrs[];
  52
  53 struct scsi_transport_template *zfcp_transport_template;
  54
  55 struct zfcp_data zfcp_data = {
  56         .scsi_host_template = {
  57               name:                    ZFCP_NAME,
  58               proc_name:               "zfcp",
  59               proc_info:               NULL,
  60               detect:                  NULL,
  61               slave_alloc:             zfcp_scsi_slave_alloc,
  62               slave_configure:         zfcp_scsi_slave_configure,
  63               slave_destroy:           zfcp_scsi_slave_destroy,
  64               queuecommand:            zfcp_scsi_queuecommand,
  65               eh_abort_handler:        zfcp_scsi_eh_abort_handler,
  66               eh_device_reset_handler: zfcp_scsi_eh_device_reset_handler,
  67               eh_bus_reset_handler:    zfcp_scsi_eh_bus_reset_handler,
  68               eh_host_reset_handler:   zfcp_scsi_eh_host_reset_handler,
  69                                        /* FIXME(openfcp): Tune */
  70               can_queue:               4096,
  71               this_id:                 -1,
  72               /*
  73                * FIXME:
  74                * one less? can zfcp_create_sbale cope with it?
  75                */
  76               sg_tablesize:            ZFCP_MAX_SBALES_PER_REQ,
  77               cmd_per_lun:             1,
  78               unchecked_isa_dma:       0,
  79               use_clustering:          1,
  80               sdev_attrs:              zfcp_sysfs_sdev_attrs,
  81         },
  82         .driver_version = ZFCP_VERSION,
  83         /* rest initialised with zeros */
  84 };
  85
  86 /* Find start of Response Information in FCP response unit*/
  87 char *
  88 zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  89 {
  90         char *fcp_rsp_info_ptr;
  91
  92         fcp_rsp_info_ptr =
  93             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
  94
  95         return fcp_rsp_info_ptr;
  96 }
  97
  98 /* Find start of Sense Information in FCP response unit*/
  99 char *
 100 zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
 101 {
 102         char *fcp_sns_info_ptr;
 103
 104         fcp_sns_info_ptr =
 105             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
 106         if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
 107                 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr +
 108                     fcp_rsp_iu->fcp_rsp_len;
 109
 110         return fcp_sns_info_ptr;
 111 }
 112
 113 fcp_dl_t *
 114 zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd)
 115 {
 116         int additional_length = fcp_cmd->add_fcp_cdb_length << 2;
 117         fcp_dl_t *fcp_dl_addr;
 118
 119         fcp_dl_addr = (fcp_dl_t *)
 120                 ((unsigned char *) fcp_cmd +
 121                  sizeof (struct fcp_cmnd_iu) + additional_length);
 122         /*
 123          * fcp_dl_addr = start address of fcp_cmnd structure +
 124          * size of fixed part + size of dynamically sized add_dcp_cdb field
 125          * SEE FCP-2 documentation
 126          */
 127         return fcp_dl_addr;
 128 }
 129
 130 fcp_dl_t
 131 zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd)
 132 {
 133         return *zfcp_get_fcp_dl_ptr(fcp_cmd);
 134 }
 135
 136 void
 137 zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
 138 {
 139         *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl;
 140 }
 141
 142 /*
 143  * note: it's a bit-or operation not an assignment
 144  * regarding the specified byte
 145  */
 146 static inline void
 147 set_byte(u32 * result, char status, char pos)
 148 {
 149         *result |= status << (pos * 8);
 150 }
 151
 152 void
 153 set_host_byte(u32 * result, char status)
 154 {
 155         set_byte(result, status, 2);
 156 }
 157
 158 void
 159 set_driver_byte(u32 * result, char status)
 160 {
 161         set_byte(result, status, 3);
 162 }
 163
 164 /*
 165  * function:    zfcp_scsi_slave_alloc
 166  *
 167  * purpose:
 168  *
 169  * returns:
 170  */
 171
 172 static int
 173 zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 174 {
 175         struct zfcp_adapter *adapter;
 176         struct zfcp_unit *unit;
 177         unsigned long flags;
 178         int retval = -ENXIO;
 179
 180         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 181         if (!adapter)
 182                 goto out;
 183
 184         read_lock_irqsave(&zfcp_data.config_lock, flags);
 185         unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
 186         if (unit && atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED,
 187                                      &unit->status)) {
 188                 sdp->hostdata = unit;
 189                 unit->device = sdp;
 190                 zfcp_unit_get(unit);
 191                 retval = 0;
 192         }
 193         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 194  out:
 195         return retval;
 196 }
 197
 198 /*
 199  * function:    zfcp_scsi_slave_destroy
 200  *
 201  * purpose:
 202  *
 203  * returns:
 204  */
 205
 206 static void
 207 zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
 208 {
 209         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
 210
 211         if (unit) {
 212                 atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status);
 213                 sdpnt->hostdata = NULL;
 214                 unit->device = NULL;
 215                 zfcp_unit_put(unit);
 216         } else {
 217                 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at "
 218                                 "address %p\n", sdpnt);
 219         }
 220 }
 221
 222 /*
 223  * called from scsi midlayer to allow finetuning of a device.
 224  */
 225 static int
 226 zfcp_scsi_slave_configure(struct scsi_device *sdp)
 227 {
 228         if (sdp->tagged_supported)
 229                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN);
 230         else
 231                 scsi_adjust_queue_depth(sdp, 0, 1);
 232         return 0;
 233 }
 234
 235 /**
 236  * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function
 237  * @scpnt: pointer to struct scsi_cmnd where result is set
 238  * @result: result to be set in scpnt (e.g. DID_ERROR)
 239  */
 240 static void
 241 zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
 242 {
 243         set_host_byte(&scpnt->result, result);
 244         if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
 245                 zfcp_scsi_dbf_event_result("fail", 4,
 246                         (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
 247                         scpnt, NULL);
 248         /* return directly */
 249         scpnt->scsi_done(scpnt);
 250 }
 251
 252 /**
 253  * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and
 254  *      zfcp_scsi_command_sync
 255  * @adapter: adapter where scsi command is issued
 256  * @unit: unit to which scsi command is sent
 257  * @scpnt: scsi command to be sent
 258  * @timer: timer to be started if request is successfully initiated
 259  *
 260  * Note: In scsi_done function must be set in scpnt.
 261  */
 262 int
 263 zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit,
 264                         struct scsi_cmnd *scpnt, struct timer_list *timer)
 265 {
 266         int tmp;
 267         int retval;
 268
 269         retval = 0;
 270
 271         BUG_ON((adapter == NULL) || (adapter != unit->port->adapter));
 272         BUG_ON(scpnt->scsi_done == NULL);
 273
 274         if (unlikely(NULL == unit)) {
 275                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
 276                 goto out;
 277         }
 278
 279         if (unlikely(
 280               atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) ||
 281              !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) {
 282                 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port "
 283                                "0x%016Lx on adapter %s\n",
 284                                unit->fcp_lun, unit->port->wwpn,
 285                                zfcp_get_busid_by_adapter(adapter));
 286                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 287                 goto out;
 288         }
 289
 290         if (unlikely(
 291              !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) {
 292                 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx "
 293                                "on port 0x%016Lx in recovery\n",
 294                                zfcp_get_busid_by_unit(unit),
 295                                unit->fcp_lun, unit->port->wwpn);
 296                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
 297                 goto out;
 298         }
 299
 300         tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, timer,
 301                                              ZFCP_REQ_AUTO_CLEANUP);
 302
 303         if (unlikely(tmp < 0)) {
 304                 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n");
 305                 retval = SCSI_MLQUEUE_HOST_BUSY;
 306         }
 307
 308 out:
 309         return retval;
 310 }
 311
 312 void
 313 zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt)
 314 {
 315         struct completion *wait = (struct completion *) scpnt->SCp.ptr;
 316         complete(wait);
 317 }
 318
 319
 320 /**
 321  * zfcp_scsi_command_sync - send a SCSI command and wait for completion
 322  * @unit: unit where command is sent to
 323  * @scpnt: scsi command to be sent
 324  * @timer: timer to be started if request is successfully initiated
 325  * Return: 0
 326  *
 327  * Errors are indicated in scpnt->result
 328  */
 329 int
 330 zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt,
 331                        struct timer_list *timer)
 332 {
 333         int ret;
 334         DECLARE_COMPLETION(wait);
 335
 336         scpnt->SCp.ptr = (void *) &wait;  /* silent re-use */
 337         scpnt->scsi_done = zfcp_scsi_command_sync_handler;
 338         ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, timer);
 339         if (ret == 0)
 340                 wait_for_completion(&wait);
 341
 342         scpnt->SCp.ptr = NULL;
 343
 344         return 0;
 345 }
 346
 347 /*
 348  * function:    zfcp_scsi_queuecommand
 349  *
 350  * purpose:     enqueues a SCSI command to the specified target device
 351  *
 352  * returns:     0 - success, SCSI command enqueued
 353  *              !0 - failure
 354  */
 355 int
 356 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
 357                        void (*done) (struct scsi_cmnd *))
 358 {
 359         struct zfcp_unit *unit;
 360         struct zfcp_adapter *adapter;
 361
 362         /* reset the status for this request */
 363         scpnt->result = 0;
 364         scpnt->host_scribble = NULL;
 365         scpnt->scsi_done = done;
 366
 367         /*
 368          * figure out adapter and target device
 369          * (stored there by zfcp_scsi_slave_alloc)
 370          */
 371         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
 372         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 373
 374         return zfcp_scsi_command_async(adapter, unit, scpnt, NULL);
 375 }
 376
 377 /*
 378  * function:    zfcp_unit_lookup
 379  *
 380  * purpose:
 381  *
 382  * returns:
 383  *
 384  * context:
 385  */
 386 static struct zfcp_unit *
 387 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id,
 388                  scsi_lun_t lun)
 389 {
 390         struct zfcp_port *port;
 391         struct zfcp_unit *unit, *retval = NULL;
 392
 393         list_for_each_entry(port, &adapter->port_list_head, list) {
 394                 if (!port->rport || (id != port->rport->scsi_target_id))
 395                         continue;
 396                 list_for_each_entry(unit, &port->unit_list_head, list) {
 397                         if (lun == unit->scsi_lun) {
 398                                 retval = unit;
 399                                 goto out;
 400                         }
 401                 }
 402         }
 403  out:
 404         return retval;
 405 }
 406
 407 /**
 408  * zfcp_scsi_eh_abort_handler - abort the specified SCSI command
 409  * @scpnt: pointer to scsi_cmnd to be aborted
 410  * Return: SUCCESS - command has been aborted and cleaned up in internal
 411  *          bookkeeping, SCSI stack won't be called for aborted command
 412  *         FAILED - otherwise
 413  *
 414  * We do not need to care for a SCSI command which completes normally
 415  * but late during this abort routine runs.  We are allowed to return
 416  * late commands to the SCSI stack.  It tracks the state of commands and
 417  * will handle late commands.  (Usually, the normal completion of late
 418  * commands is ignored with respect to the running abort operation.)
 419  */
 420 int
 421 zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 422 {
 423         struct Scsi_Host *scsi_host;
 424         struct zfcp_adapter *adapter;
 425         struct zfcp_unit *unit;
 426         int retval = SUCCESS;
 427         struct zfcp_fsf_req *new_fsf_req = NULL;
 428         struct zfcp_fsf_req *old_fsf_req;
 429         unsigned long flags;
 430
 431         scsi_host = scpnt->device->host;
 432         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
 433         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 434
 435         ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
 436                       scpnt, zfcp_get_busid_by_adapter(adapter));
 437
 438         /* avoid race condition between late normal completion and abort */
 439         write_lock_irqsave(&adapter->abort_lock, flags);
 440
 441         /*
 442          * Check whether command has just completed and can not be aborted.
 443          * Even if the command has just been completed late, we can access
 444          * scpnt since the SCSI stack does not release it at least until
 445          * this routine returns. (scpnt is parameter passed to this routine
 446          * and must not disappear during abort even on late completion.)
 447          */
 448         old_fsf_req = (struct zfcp_fsf_req *) scpnt->host_scribble;
 449         if (!old_fsf_req) {
 450                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 451                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, NULL);
 452                 retval = SUCCESS;
 453                 goto out;
 454         }
 455         old_fsf_req->data = 0;
 456         old_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
 457
 458         /* don't access old_fsf_req after releasing the abort_lock */
 459         write_unlock_irqrestore(&adapter->abort_lock, flags);
 460         /* call FSF routine which does the abort */
 461         new_fsf_req = zfcp_fsf_abort_fcp_command((unsigned long) old_fsf_req,
 462                                                  adapter, unit, 0);
 463         if (!new_fsf_req) {
 464                 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n");
 465                 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
 466                                           old_fsf_req);
 467                 retval = FAILED;
 468                 goto out;
 469         }
 470
 471         /* wait for completion of abort */
 472         __wait_event(new_fsf_req->completion_wq,
 473                      new_fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 474
 475         /* status should be valid since signals were not permitted */
 476         if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
 477                 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, new_fsf_req,
 478                                           NULL);
 479                 retval = SUCCESS;
 480         } else if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
 481                 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, new_fsf_req,
 482                                           NULL);
 483                 retval = SUCCESS;
 484         } else {
 485                 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, new_fsf_req,
 486                                           NULL);
 487                 retval = FAILED;
 488         }
 489         zfcp_fsf_req_free(new_fsf_req);
 490  out:
 491         return retval;
 492 }
 493
 494 /*
 495  * function:    zfcp_scsi_eh_device_reset_handler
 496  *
 497  * purpose:
 498  *
 499  * returns:
 500  */
 501 int
 502 zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 503 {
 504         int retval;
 505         struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
 506
 507         if (!unit) {
 508                 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
 509                 retval = SUCCESS;
 510                 goto out;
 511         }
 512         ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun);
 513
 514         /*
 515          * If we do not know whether the unit supports 'logical unit reset'
 516          * then try 'logical unit reset' and proceed with 'target reset'
 517          * if 'logical unit reset' fails.
 518          * If the unit is known not to support 'logical unit reset' then
 519          * skip 'logical unit reset' and try 'target reset' immediately.
 520          */
 521         if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 522                               &unit->status)) {
 523                 retval = zfcp_task_management_function(unit,
 524                                                        FCP_LOGICAL_UNIT_RESET,
 525                                                        scpnt);
 526                 if (retval) {
 527                         ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit);
 528                         if (retval == -ENOTSUPP)
 529                                 atomic_set_mask
 530                                     (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 531                                      &unit->status);
 532                         /* fall through and try 'target reset' next */
 533                 } else {
 534                         ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n",
 535                                        unit);
 536                         /* avoid 'target reset' */
 537                         retval = SUCCESS;
 538                         goto out;
 539                 }
 540         }
 541         retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt);
 542         if (retval) {
 543                 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit);
 544                 retval = FAILED;
 545         } else {
 546                 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit);
 547                 retval = SUCCESS;
 548         }
 549  out:
 550         return retval;
 551 }
 552
 553 static int
 554 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags,
 555                               struct scsi_cmnd *scpnt)
 556 {
 557         struct zfcp_adapter *adapter = unit->port->adapter;
 558         struct zfcp_fsf_req *fsf_req;
 559         int retval = 0;
 560
 561         /* issue task management function */
 562         fsf_req = zfcp_fsf_send_fcp_command_task_management
 563                 (adapter, unit, tm_flags, 0);
 564         if (!fsf_req) {
 565                 ZFCP_LOG_INFO("error: creation of task management request "
 566                               "failed for unit 0x%016Lx on port 0x%016Lx on  "
 567                               "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
 568                               zfcp_get_busid_by_adapter(adapter));
 569                 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
 570                 retval = -ENOMEM;
 571                 goto out;
 572         }
 573
 574         __wait_event(fsf_req->completion_wq,
 575                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 576
 577         /*
 578          * check completion status of task management function
 579          */
 580         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 581                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
 582                 retval = -EIO;
 583         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
 584                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
 585                 retval = -ENOTSUPP;
 586         } else
 587                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
 588
 589         zfcp_fsf_req_free(fsf_req);
 590  out:
 591         return retval;
 592 }
 593
 594 /**
 595  * zfcp_scsi_eh_bus_reset_handler - reset bus (reopen adapter)
 596  */
 597 int
 598 zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *scpnt)
 599 {
 600         struct zfcp_unit *unit = (struct zfcp_unit*) scpnt->device->hostdata;
 601         struct zfcp_adapter *adapter = unit->port->adapter;
 602
 603         ZFCP_LOG_NORMAL("bus reset because of problems with "
 604                         "unit 0x%016Lx\n", unit->fcp_lun);
 605         zfcp_erp_adapter_reopen(adapter, 0);
 606         zfcp_erp_wait(adapter);
 607
 608         return SUCCESS;
 609 }
 610
 611 /**
 612  * zfcp_scsi_eh_host_reset_handler - reset host (reopen adapter)
 613  */
 614 int
 615 zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 616 {
 617         struct zfcp_unit *unit = (struct zfcp_unit*) scpnt->device->hostdata;
 618         struct zfcp_adapter *adapter = unit->port->adapter;
 619
 620         ZFCP_LOG_NORMAL("host reset because of problems with "
 621                         "unit 0x%016Lx\n", unit->fcp_lun);
 622         zfcp_erp_adapter_reopen(adapter, 0);
 623         zfcp_erp_wait(adapter);
 624
 625         return SUCCESS;
 626 }
 627
 628 /*
 629  * function:
 630  *
 631  * purpose:
 632  *
 633  * returns:
 634  */
 635 int
 636 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 637 {
 638         int retval = 0;
 639         static unsigned int unique_id = 0;
 640
 641         /* register adapter as SCSI host with mid layer of SCSI stack */
 642         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 643                                              sizeof (struct zfcp_adapter *));
 644         if (!adapter->scsi_host) {
 645                 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
 646                                 "for adapter %s ",
 647                                 zfcp_get_busid_by_adapter(adapter));
 648                 retval = -EIO;
 649                 goto out;
 650         }
 651         ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
 652
 653         /* tell the SCSI stack some characteristics of this adapter */
 654         adapter->scsi_host->max_id = 1;
 655         adapter->scsi_host->max_lun = 1;
 656         adapter->scsi_host->max_channel = 0;
 657         adapter->scsi_host->unique_id = unique_id++;    /* FIXME */
 658         adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
 659         adapter->scsi_host->transportt = zfcp_transport_template;
 660         /*
 661          * Reverse mapping of the host number to avoid race condition
 662          */
 663         adapter->scsi_host_no = adapter->scsi_host->host_no;
 664
 665         /*
 666          * save a pointer to our own adapter data structure within
 667          * hostdata field of SCSI host data structure
 668          */
 669         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 670
 671         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 672                 scsi_host_put(adapter->scsi_host);
 673                 retval = -EIO;
 674                 goto out;
 675         }
 676         atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 677  out:
 678         return retval;
 679 }
 680
 681 /*
 682  * function:
 683  *
 684  * purpose:
 685  *
 686  * returns:
 687  */
 688 void
 689 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 690 {
 691         struct Scsi_Host *shost;
 692         struct zfcp_port *port;
 693
 694         shost = adapter->scsi_host;
 695         if (!shost)
 696                 return;
 697         read_lock_irq(&zfcp_data.config_lock);
 698         list_for_each_entry(port, &adapter->port_list_head, list)
 699                 if (port->rport)
 700                         port->rport = NULL;
 701         read_unlock_irq(&zfcp_data.config_lock);
 702         fc_remove_host(shost);
 703         scsi_remove_host(shost);
 704         scsi_host_put(shost);
 705         adapter->scsi_host = NULL;
 706         adapter->scsi_host_no = 0;
 707         atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 708
 709         return;
 710 }
 711
 712
 713 void
 714 zfcp_fsf_start_scsi_er_timer(struct zfcp_adapter *adapter)
 715 {
 716         adapter->scsi_er_timer.function = zfcp_fsf_scsi_er_timeout_handler;
 717         adapter->scsi_er_timer.data = (unsigned long) adapter;
 718         adapter->scsi_er_timer.expires = jiffies + ZFCP_SCSI_ER_TIMEOUT;
 719         add_timer(&adapter->scsi_er_timer);
 720 }
 721
 722 /*
 723  * Support functions for FC transport class
 724  */
 725 static struct fc_host_statistics*
 726 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 727 {
 728         struct fc_host_statistics *fc_stats;
 729
 730         if (!adapter->fc_stats) {
 731                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 732                 if (!fc_stats)
 733                         return NULL;
 734                 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
 735         }
 736         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 737         return adapter->fc_stats;
 738 }
 739
 740 static void
 741 zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 742                           struct fsf_qtcb_bottom_port *data,
 743                           struct fsf_qtcb_bottom_port *old)
 744 {
 745         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset -
 746                 old->seconds_since_last_reset;
 747         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 748         fc_stats->tx_words = data->tx_words - old->tx_words;
 749         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 750         fc_stats->rx_words = data->rx_words - old->rx_words;
 751         fc_stats->lip_count = data->lip - old->lip;
 752         fc_stats->nos_count = data->nos - old->nos;
 753         fc_stats->error_frames = data->error_frames - old->error_frames;
 754         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 755         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 756         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 757         fc_stats->loss_of_signal_count = data->loss_of_signal -
 758                 old->loss_of_signal;
 759         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts -
 760                 old->psp_error_counts;
 761         fc_stats->invalid_tx_word_count = data->invalid_tx_words -
 762                 old->invalid_tx_words;
 763         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 764         fc_stats->fcp_input_requests = data->input_requests -
 765                 old->input_requests;
 766         fc_stats->fcp_output_requests = data->output_requests -
 767                 old->output_requests;
 768         fc_stats->fcp_control_requests = data->control_requests -
 769                 old->control_requests;
 770         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 771         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 772 }
 773
 774 static void
 775 zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 776                        struct fsf_qtcb_bottom_port *data)
 777 {
 778         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 779         fc_stats->tx_frames = data->tx_frames;
 780         fc_stats->tx_words = data->tx_words;
 781         fc_stats->rx_frames = data->rx_frames;
 782         fc_stats->rx_words = data->rx_words;
 783         fc_stats->lip_count = data->lip;
 784         fc_stats->nos_count = data->nos;
 785         fc_stats->error_frames = data->error_frames;
 786         fc_stats->dumped_frames = data->dumped_frames;
 787         fc_stats->link_failure_count = data->link_failure;
 788         fc_stats->loss_of_sync_count = data->loss_of_sync;
 789         fc_stats->loss_of_signal_count = data->loss_of_signal;
 790         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 791         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 792         fc_stats->invalid_crc_count = data->invalid_crcs;
 793         fc_stats->fcp_input_requests = data->input_requests;
 794         fc_stats->fcp_output_requests = data->output_requests;
 795         fc_stats->fcp_control_requests = data->control_requests;
 796         fc_stats->fcp_input_megabytes = data->input_mb;
 797         fc_stats->fcp_output_megabytes = data->output_mb;
 798 }
 799
 800 /**
 801  * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc
 802  *
 803  * assumption: scsi_transport_fc synchronizes calls of
 804  *             get_fc_host_stats and reset_fc_host_stats
 805  *             (XXX to be checked otherwise introduce locking)
 806  */
 807 static struct fc_host_statistics *
 808 zfcp_get_fc_host_stats(struct Scsi_Host *shost)
 809 {
 810         struct zfcp_adapter *adapter;
 811         struct fc_host_statistics *fc_stats;
 812         struct fsf_qtcb_bottom_port *data;
 813         int ret;
 814
 815         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 816         fc_stats = zfcp_init_fc_host_stats(adapter);
 817         if (!fc_stats)
 818                 return NULL;
 819
 820         data = kmalloc(sizeof(*data), GFP_KERNEL);
 821         if (!data)
 822                 return NULL;
 823         memset(data, 0, sizeof(*data));
 824
 825         ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
 826         if (ret) {
 827                 kfree(data);
 828                 return NULL; /* XXX return zeroed fc_stats? */
 829         }
 830
 831         if (adapter->stats_reset &&
 832             ((jiffies/HZ - adapter->stats_reset) <
 833              data->seconds_since_last_reset)) {
 834                 zfcp_adjust_fc_host_stats(fc_stats, data,
 835                                           adapter->stats_reset_data);
 836         } else
 837                 zfcp_set_fc_host_stats(fc_stats, data);
 838
 839         kfree(data);
 840         return fc_stats;
 841 }
 842
 843 static void
 844 zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 845 {
 846         struct zfcp_adapter *adapter;
 847         struct fsf_qtcb_bottom_port *data, *old_data;
 848         int ret;
 849
 850         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 851         data = kmalloc(sizeof(*data), GFP_KERNEL);
 852         if (!data)
 853                 return;
 854         memset(data, 0, sizeof(*data));
 855
 856         ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
 857         if (ret == 0) {
 858                 adapter->stats_reset = jiffies/HZ;
 859                 old_data = adapter->stats_reset_data;
 860                 adapter->stats_reset_data = data; /* finally freed in
 861                                                      adater_dequeue */
 862                 kfree(old_data);
 863         }
 864 }
 865
 866 struct fc_function_template zfcp_transport_functions = {
 867         .show_starget_port_id = 1,
 868         .show_starget_port_name = 1,
 869         .show_starget_node_name = 1,
 870         .show_rport_supported_classes = 1,
 871         .show_host_node_name = 1,
 872         .show_host_port_name = 1,
 873         .show_host_permanent_port_name = 1,
 874         .show_host_supported_classes = 1,
 875         .show_host_supported_speeds = 1,
 876         .show_host_maxframe_size = 1,
 877         .show_host_serial_number = 1,
 878         .get_fc_host_stats = zfcp_get_fc_host_stats,
 879         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 880         /* no functions registered for following dynamic attributes but
 881            directly set by LLDD */
 882         .show_host_port_type = 1,
 883         .show_host_speed = 1,
 884         .show_host_port_id = 1,
 885 };
 886
 887 /**
 888  * ZFCP_DEFINE_SCSI_ATTR
 889  * @_name:   name of show attribute
 890  * @_format: format string
 891  * @_value:  value to print
 892  *
 893  * Generates attribute for a unit.
 894  */
 895 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)                    \
 896 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr,        \
 897                                               char *buf)                 \
 898 {                                                                        \
 899         struct scsi_device *sdev;                                        \
 900         struct zfcp_unit *unit;                                          \
 901                                                                          \
 902         sdev = to_scsi_device(dev);                                      \
 903         unit = sdev->hostdata;                                           \
 904         return sprintf(buf, _format, _value);                            \
 905 }                                                                        \
 906                                                                          \
 907 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
 908
 909 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
 910 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
 911 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
 912
 913 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
 914         &dev_attr_fcp_lun,
 915         &dev_attr_wwpn,
 916         &dev_attr_hba_id,
 917         NULL
 918 };
 919
 920 #undef ZFCP_LOG_AREA