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 scsi_transport_template *zfcp_transport_template;
  43
  44 struct zfcp_data zfcp_data = {
  45         .scsi_host_template = {
  46                 .name                   = ZFCP_NAME,
  47                 .proc_name              = "zfcp",
  48                 .slave_alloc            = zfcp_scsi_slave_alloc,
  49                 .slave_configure        = zfcp_scsi_slave_configure,
  50                 .slave_destroy          = zfcp_scsi_slave_destroy,
  51                 .queuecommand           = zfcp_scsi_queuecommand,
  52                 .eh_abort_handler       = zfcp_scsi_eh_abort_handler,
  53                 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
  54                 .eh_bus_reset_handler   = zfcp_scsi_eh_host_reset_handler,
  55                 .eh_host_reset_handler  = zfcp_scsi_eh_host_reset_handler,
  56                 .can_queue              = 4096,
  57                 .this_id                = -1,
  58                 .sg_tablesize           = ZFCP_MAX_SBALES_PER_REQ,
  59                 .cmd_per_lun            = 1,
  60                 .use_clustering         = 1,
  61                 .sdev_attrs             = zfcp_sysfs_sdev_attrs,
  62         },
  63         .driver_version = ZFCP_VERSION,
  64 };
  65
  66 /* Find start of Response Information in FCP response unit*/
  67 char *
  68 zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  69 {
  70         char *fcp_rsp_info_ptr;
  71
  72         fcp_rsp_info_ptr =
  73             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
  74
  75         return fcp_rsp_info_ptr;
  76 }
  77
  78 /* Find start of Sense Information in FCP response unit*/
  79 char *
  80 zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  81 {
  82         char *fcp_sns_info_ptr;
  83
  84         fcp_sns_info_ptr =
  85             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
  86         if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
  87                 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr +
  88                     fcp_rsp_iu->fcp_rsp_len;
  89
  90         return fcp_sns_info_ptr;
  91 }
  92
  93 fcp_dl_t *
  94 zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd)
  95 {
  96         int additional_length = fcp_cmd->add_fcp_cdb_length << 2;
  97         fcp_dl_t *fcp_dl_addr;
  98
  99         fcp_dl_addr = (fcp_dl_t *)
 100                 ((unsigned char *) fcp_cmd +
 101                  sizeof (struct fcp_cmnd_iu) + additional_length);
 102         /*
 103          * fcp_dl_addr = start address of fcp_cmnd structure +
 104          * size of fixed part + size of dynamically sized add_dcp_cdb field
 105          * SEE FCP-2 documentation
 106          */
 107         return fcp_dl_addr;
 108 }
 109
 110 fcp_dl_t
 111 zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd)
 112 {
 113         return *zfcp_get_fcp_dl_ptr(fcp_cmd);
 114 }
 115
 116 void
 117 zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
 118 {
 119         *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl;
 120 }
 121
 122 /*
 123  * note: it's a bit-or operation not an assignment
 124  * regarding the specified byte
 125  */
 126 static inline void
 127 set_byte(u32 * result, char status, char pos)
 128 {
 129         *result |= status << (pos * 8);
 130 }
 131
 132 void
 133 set_host_byte(u32 * result, char status)
 134 {
 135         set_byte(result, status, 2);
 136 }
 137
 138 void
 139 set_driver_byte(u32 * result, char status)
 140 {
 141         set_byte(result, status, 3);
 142 }
 143
 144 static int
 145 zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 146 {
 147         struct zfcp_adapter *adapter;
 148         struct zfcp_unit *unit;
 149         unsigned long flags;
 150         int retval = -ENXIO;
 151
 152         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 153         if (!adapter)
 154                 goto out;
 155
 156         read_lock_irqsave(&zfcp_data.config_lock, flags);
 157         unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
 158         if (unit && atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED,
 159                                      &unit->status)) {
 160                 sdp->hostdata = unit;
 161                 unit->device = sdp;
 162                 zfcp_unit_get(unit);
 163                 retval = 0;
 164         }
 165         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 166  out:
 167         return retval;
 168 }
 169
 170 /**
 171  * zfcp_scsi_slave_destroy - called when scsi device is removed
 172  *
 173  * Remove reference to associated scsi device for an zfcp_unit.
 174  * Mark zfcp_unit as failed. The scsi device might be deleted via sysfs
 175  * or a scan for this device might have failed.
 176  */
 177 static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
 178 {
 179         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
 180
 181         if (unit) {
 182                 atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status);
 183                 sdpnt->hostdata = NULL;
 184                 unit->device = NULL;
 185                 zfcp_erp_unit_failed(unit);
 186                 zfcp_unit_put(unit);
 187         } else {
 188                 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at "
 189                                 "address %p\n", sdpnt);
 190         }
 191 }
 192
 193 /*
 194  * called from scsi midlayer to allow finetuning of a device.
 195  */
 196 static int
 197 zfcp_scsi_slave_configure(struct scsi_device *sdp)
 198 {
 199         if (sdp->tagged_supported)
 200                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN);
 201         else
 202                 scsi_adjust_queue_depth(sdp, 0, 1);
 203         return 0;
 204 }
 205
 206 /**
 207  * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function
 208  * @scpnt: pointer to struct scsi_cmnd where result is set
 209  * @result: result to be set in scpnt (e.g. DID_ERROR)
 210  */
 211 static void
 212 zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
 213 {
 214         set_host_byte(&scpnt->result, result);
 215         if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
 216                 zfcp_scsi_dbf_event_result("fail", 4,
 217                         (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
 218                         scpnt, NULL);
 219         /* return directly */
 220         scpnt->scsi_done(scpnt);
 221 }
 222
 223 /**
 224  * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and
 225  *      zfcp_scsi_command_sync
 226  * @adapter: adapter where scsi command is issued
 227  * @unit: unit to which scsi command is sent
 228  * @scpnt: scsi command to be sent
 229  * @timer: timer to be started if request is successfully initiated
 230  *
 231  * Note: In scsi_done function must be set in scpnt.
 232  */
 233 int
 234 zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit,
 235                         struct scsi_cmnd *scpnt, struct timer_list *timer)
 236 {
 237         int tmp;
 238         int retval;
 239
 240         retval = 0;
 241
 242         BUG_ON((adapter == NULL) || (adapter != unit->port->adapter));
 243         BUG_ON(scpnt->scsi_done == NULL);
 244
 245         if (unlikely(NULL == unit)) {
 246                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
 247                 goto out;
 248         }
 249
 250         if (unlikely(
 251               atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) ||
 252              !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) {
 253                 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port "
 254                                "0x%016Lx on adapter %s\n",
 255                                unit->fcp_lun, unit->port->wwpn,
 256                                zfcp_get_busid_by_adapter(adapter));
 257                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 258                 goto out;
 259         }
 260
 261         if (unlikely(
 262              !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) {
 263                 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx "
 264                                "on port 0x%016Lx in recovery\n",
 265                                zfcp_get_busid_by_unit(unit),
 266                                unit->fcp_lun, unit->port->wwpn);
 267                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
 268                 goto out;
 269         }
 270
 271         tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, timer,
 272                                              ZFCP_REQ_AUTO_CLEANUP);
 273
 274         if (unlikely(tmp < 0)) {
 275                 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n");
 276                 retval = SCSI_MLQUEUE_HOST_BUSY;
 277         }
 278
 279 out:
 280         return retval;
 281 }
 282
 283 void
 284 zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt)
 285 {
 286         struct completion *wait = (struct completion *) scpnt->SCp.ptr;
 287         complete(wait);
 288 }
 289
 290
 291 /**
 292  * zfcp_scsi_command_sync - send a SCSI command and wait for completion
 293  * @unit: unit where command is sent to
 294  * @scpnt: scsi command to be sent
 295  * @timer: timer to be started if request is successfully initiated
 296  * Return: 0
 297  *
 298  * Errors are indicated in scpnt->result
 299  */
 300 int
 301 zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt,
 302                        struct timer_list *timer)
 303 {
 304         int ret;
 305         DECLARE_COMPLETION(wait);
 306
 307         scpnt->SCp.ptr = (void *) &wait;  /* silent re-use */
 308         scpnt->scsi_done = zfcp_scsi_command_sync_handler;
 309         ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, timer);
 310         if (ret == 0)
 311                 wait_for_completion(&wait);
 312
 313         scpnt->SCp.ptr = NULL;
 314
 315         return 0;
 316 }
 317
 318 /*
 319  * function:    zfcp_scsi_queuecommand
 320  *
 321  * purpose:     enqueues a SCSI command to the specified target device
 322  *
 323  * returns:     0 - success, SCSI command enqueued
 324  *              !0 - failure
 325  */
 326 int
 327 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
 328                        void (*done) (struct scsi_cmnd *))
 329 {
 330         struct zfcp_unit *unit;
 331         struct zfcp_adapter *adapter;
 332
 333         /* reset the status for this request */
 334         scpnt->result = 0;
 335         scpnt->host_scribble = NULL;
 336         scpnt->scsi_done = done;
 337
 338         /*
 339          * figure out adapter and target device
 340          * (stored there by zfcp_scsi_slave_alloc)
 341          */
 342         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
 343         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 344
 345         return zfcp_scsi_command_async(adapter, unit, scpnt, NULL);
 346 }
 347
 348 static struct zfcp_unit *
 349 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, unsigned int id,
 350                  unsigned int lun)
 351 {
 352         struct zfcp_port *port;
 353         struct zfcp_unit *unit, *retval = NULL;
 354
 355         list_for_each_entry(port, &adapter->port_list_head, list) {
 356                 if (!port->rport || (id != port->rport->scsi_target_id))
 357                         continue;
 358                 list_for_each_entry(unit, &port->unit_list_head, list) {
 359                         if (lun == unit->scsi_lun) {
 360                                 retval = unit;
 361                                 goto out;
 362                         }
 363                 }
 364         }
 365  out:
 366         return retval;
 367 }
 368
 369 /**
 370  * zfcp_scsi_eh_abort_handler - abort the specified SCSI command
 371  * @scpnt: pointer to scsi_cmnd to be aborted
 372  * Return: SUCCESS - command has been aborted and cleaned up in internal
 373  *          bookkeeping, SCSI stack won't be called for aborted command
 374  *         FAILED - otherwise
 375  *
 376  * We do not need to care for a SCSI command which completes normally
 377  * but late during this abort routine runs.  We are allowed to return
 378  * late commands to the SCSI stack.  It tracks the state of commands and
 379  * will handle late commands.  (Usually, the normal completion of late
 380  * commands is ignored with respect to the running abort operation.)
 381  */
 382 int
 383 zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 384 {
 385         struct Scsi_Host *scsi_host;
 386         struct zfcp_adapter *adapter;
 387         struct zfcp_unit *unit;
 388         int retval = SUCCESS;
 389         struct zfcp_fsf_req *new_fsf_req = NULL;
 390         struct zfcp_fsf_req *old_fsf_req;
 391         unsigned long flags;
 392
 393         scsi_host = scpnt->device->host;
 394         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
 395         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 396
 397         ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
 398                       scpnt, zfcp_get_busid_by_adapter(adapter));
 399
 400         /* avoid race condition between late normal completion and abort */
 401         write_lock_irqsave(&adapter->abort_lock, flags);
 402
 403         /*
 404          * Check whether command has just completed and can not be aborted.
 405          * Even if the command has just been completed late, we can access
 406          * scpnt since the SCSI stack does not release it at least until
 407          * this routine returns. (scpnt is parameter passed to this routine
 408          * and must not disappear during abort even on late completion.)
 409          */
 410         old_fsf_req = (struct zfcp_fsf_req *) scpnt->host_scribble;
 411         if (!old_fsf_req) {
 412                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 413                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, NULL);
 414                 retval = SUCCESS;
 415                 goto out;
 416         }
 417         old_fsf_req->data = 0;
 418         old_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
 419
 420         /* don't access old_fsf_req after releasing the abort_lock */
 421         write_unlock_irqrestore(&adapter->abort_lock, flags);
 422         /* call FSF routine which does the abort */
 423         new_fsf_req = zfcp_fsf_abort_fcp_command((unsigned long) old_fsf_req,
 424                                                  adapter, unit, 0);
 425         if (!new_fsf_req) {
 426                 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n");
 427                 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
 428                                           old_fsf_req);
 429                 retval = FAILED;
 430                 goto out;
 431         }
 432
 433         /* wait for completion of abort */
 434         __wait_event(new_fsf_req->completion_wq,
 435                      new_fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 436
 437         /* status should be valid since signals were not permitted */
 438         if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
 439                 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, new_fsf_req,
 440                                           NULL);
 441                 retval = SUCCESS;
 442         } else if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
 443                 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, new_fsf_req,
 444                                           NULL);
 445                 retval = SUCCESS;
 446         } else {
 447                 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, new_fsf_req,
 448                                           NULL);
 449                 retval = FAILED;
 450         }
 451         zfcp_fsf_req_free(new_fsf_req);
 452  out:
 453         return retval;
 454 }
 455
 456 int
 457 zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 458 {
 459         int retval;
 460         struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
 461
 462         if (!unit) {
 463                 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
 464                 retval = SUCCESS;
 465                 goto out;
 466         }
 467         ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun);
 468
 469         /*
 470          * If we do not know whether the unit supports 'logical unit reset'
 471          * then try 'logical unit reset' and proceed with 'target reset'
 472          * if 'logical unit reset' fails.
 473          * If the unit is known not to support 'logical unit reset' then
 474          * skip 'logical unit reset' and try 'target reset' immediately.
 475          */
 476         if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 477                               &unit->status)) {
 478                 retval = zfcp_task_management_function(unit,
 479                                                        FCP_LOGICAL_UNIT_RESET,
 480                                                        scpnt);
 481                 if (retval) {
 482                         ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit);
 483                         if (retval == -ENOTSUPP)
 484                                 atomic_set_mask
 485                                     (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 486                                      &unit->status);
 487                         /* fall through and try 'target reset' next */
 488                 } else {
 489                         ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n",
 490                                        unit);
 491                         /* avoid 'target reset' */
 492                         retval = SUCCESS;
 493                         goto out;
 494                 }
 495         }
 496         retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt);
 497         if (retval) {
 498                 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit);
 499                 retval = FAILED;
 500         } else {
 501                 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit);
 502                 retval = SUCCESS;
 503         }
 504  out:
 505         return retval;
 506 }
 507
 508 static int
 509 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags,
 510                               struct scsi_cmnd *scpnt)
 511 {
 512         struct zfcp_adapter *adapter = unit->port->adapter;
 513         struct zfcp_fsf_req *fsf_req;
 514         int retval = 0;
 515
 516         /* issue task management function */
 517         fsf_req = zfcp_fsf_send_fcp_command_task_management
 518                 (adapter, unit, tm_flags, 0);
 519         if (!fsf_req) {
 520                 ZFCP_LOG_INFO("error: creation of task management request "
 521                               "failed for unit 0x%016Lx on port 0x%016Lx on  "
 522                               "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
 523                               zfcp_get_busid_by_adapter(adapter));
 524                 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
 525                 retval = -ENOMEM;
 526                 goto out;
 527         }
 528
 529         __wait_event(fsf_req->completion_wq,
 530                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 531
 532         /*
 533          * check completion status of task management function
 534          */
 535         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 536                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
 537                 retval = -EIO;
 538         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
 539                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
 540                 retval = -ENOTSUPP;
 541         } else
 542                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
 543
 544         zfcp_fsf_req_free(fsf_req);
 545  out:
 546         return retval;
 547 }
 548
 549 /**
 550  * zfcp_scsi_eh_host_reset_handler - handler for host and bus reset
 551  *
 552  * If ERP is already running it will be stopped.
 553  */
 554 int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 555 {
 556         struct zfcp_unit *unit;
 557         struct zfcp_adapter *adapter;
 558         unsigned long flags;
 559
 560         unit = (struct zfcp_unit*) scpnt->device->hostdata;
 561         adapter = unit->port->adapter;
 562
 563         ZFCP_LOG_NORMAL("host/bus reset because of problems with "
 564                         "unit 0x%016Lx\n", unit->fcp_lun);
 565
 566         write_lock_irqsave(&adapter->erp_lock, flags);
 567         if (atomic_test_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
 568                              &adapter->status)) {
 569                 zfcp_erp_modify_adapter_status(adapter,
 570                        ZFCP_STATUS_COMMON_UNBLOCKED|ZFCP_STATUS_COMMON_OPEN,
 571                        ZFCP_CLEAR);
 572                 zfcp_erp_action_dismiss_adapter(adapter);
 573                 write_unlock_irqrestore(&adapter->erp_lock, flags);
 574                 zfcp_fsf_req_dismiss_all(adapter);
 575                 adapter->fsf_req_seq_no = 0;
 576                 zfcp_erp_adapter_reopen(adapter, 0);
 577         } else {
 578                 write_unlock_irqrestore(&adapter->erp_lock, flags);
 579                 zfcp_erp_adapter_reopen(adapter, 0);
 580                 zfcp_erp_wait(adapter);
 581         }
 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 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 804 {
 805         rport->dev_loss_tmo = timeout;
 806 }
 807
 808 struct fc_function_template zfcp_transport_functions = {
 809         .show_starget_port_id = 1,
 810         .show_starget_port_name = 1,
 811         .show_starget_node_name = 1,
 812         .show_rport_supported_classes = 1,
 813         .show_rport_maxframe_size = 1,
 814         .show_rport_dev_loss_tmo = 1,
 815         .show_host_node_name = 1,
 816         .show_host_port_name = 1,
 817         .show_host_permanent_port_name = 1,
 818         .show_host_supported_classes = 1,
 819         .show_host_supported_speeds = 1,
 820         .show_host_maxframe_size = 1,
 821         .show_host_serial_number = 1,
 822         .get_fc_host_stats = zfcp_get_fc_host_stats,
 823         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 824         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 825         /* no functions registered for following dynamic attributes but
 826            directly set by LLDD */
 827         .show_host_port_type = 1,
 828         .show_host_speed = 1,
 829         .show_host_port_id = 1,
 830 };
 831
 832 /**
 833  * ZFCP_DEFINE_SCSI_ATTR
 834  * @_name:   name of show attribute
 835  * @_format: format string
 836  * @_value:  value to print
 837  *
 838  * Generates attribute for a unit.
 839  */
 840 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)                    \
 841 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr,        \
 842                                               char *buf)                 \
 843 {                                                                        \
 844         struct scsi_device *sdev;                                        \
 845         struct zfcp_unit *unit;                                          \
 846                                                                          \
 847         sdev = to_scsi_device(dev);                                      \
 848         unit = sdev->hostdata;                                           \
 849         return sprintf(buf, _format, _value);                            \
 850 }                                                                        \
 851                                                                          \
 852 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
 853
 854 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
 855 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
 856 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
 857
 858 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
 859         &dev_attr_fcp_lun,
 860         &dev_attr_wwpn,
 861         &dev_attr_hba_id,
 862         NULL
 863 };
 864
 865 #undef ZFCP_LOG_AREA