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