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 zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 382 {
 383         struct Scsi_Host *scsi_host;
 384         struct zfcp_adapter *adapter;
 385         struct zfcp_unit *unit;
 386         struct zfcp_fsf_req *fsf_req;
 387         unsigned long flags;
 388         unsigned long old_req_id;
 389         int retval = SUCCESS;
 390
 391         scsi_host = scpnt->device->host;
 392         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
 393         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 394
 395         ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
 396                       scpnt, zfcp_get_busid_by_adapter(adapter));
 397
 398         /* avoid race condition between late normal completion and abort */
 399         write_lock_irqsave(&adapter->abort_lock, flags);
 400
 401         /* Check whether corresponding fsf_req is still pending */
 402         spin_lock(&adapter->req_list_lock);
 403         fsf_req = zfcp_reqlist_ismember(adapter, (unsigned long)
 404                                         scpnt->host_scribble);
 405         spin_unlock(&adapter->req_list_lock);
 406         if (!fsf_req) {
 407                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 408                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, 0);
 409                 retval = SUCCESS;
 410                 goto out;
 411         }
 412         fsf_req->data = 0;
 413         fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
 414         old_req_id = fsf_req->req_id;
 415
 416         /* don't access old fsf_req after releasing the abort_lock */
 417         write_unlock_irqrestore(&adapter->abort_lock, flags);
 418
 419         fsf_req = zfcp_fsf_abort_fcp_command(old_req_id, adapter, unit, 0);
 420         if (!fsf_req) {
 421                 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n");
 422                 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
 423                                           old_req_id);
 424                 retval = FAILED;
 425                 goto out;
 426         }
 427
 428         __wait_event(fsf_req->completion_wq,
 429                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 430
 431         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
 432                 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, fsf_req, 0);
 433                 retval = SUCCESS;
 434         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
 435                 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, fsf_req, 0);
 436                 retval = SUCCESS;
 437         } else {
 438                 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, fsf_req, 0);
 439                 retval = FAILED;
 440         }
 441         zfcp_fsf_req_free(fsf_req);
 442  out:
 443         return retval;
 444 }
 445
 446 int
 447 zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 448 {
 449         int retval;
 450         struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
 451
 452         if (!unit) {
 453                 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
 454                 retval = SUCCESS;
 455                 goto out;
 456         }
 457         ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun);
 458
 459         /*
 460          * If we do not know whether the unit supports 'logical unit reset'
 461          * then try 'logical unit reset' and proceed with 'target reset'
 462          * if 'logical unit reset' fails.
 463          * If the unit is known not to support 'logical unit reset' then
 464          * skip 'logical unit reset' and try 'target reset' immediately.
 465          */
 466         if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 467                               &unit->status)) {
 468                 retval = zfcp_task_management_function(unit,
 469                                                        FCP_LOGICAL_UNIT_RESET,
 470                                                        scpnt);
 471                 if (retval) {
 472                         ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit);
 473                         if (retval == -ENOTSUPP)
 474                                 atomic_set_mask
 475                                     (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 476                                      &unit->status);
 477                         /* fall through and try 'target reset' next */
 478                 } else {
 479                         ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n",
 480                                        unit);
 481                         /* avoid 'target reset' */
 482                         retval = SUCCESS;
 483                         goto out;
 484                 }
 485         }
 486         retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt);
 487         if (retval) {
 488                 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit);
 489                 retval = FAILED;
 490         } else {
 491                 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit);
 492                 retval = SUCCESS;
 493         }
 494  out:
 495         return retval;
 496 }
 497
 498 static int
 499 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags,
 500                               struct scsi_cmnd *scpnt)
 501 {
 502         struct zfcp_adapter *adapter = unit->port->adapter;
 503         struct zfcp_fsf_req *fsf_req;
 504         int retval = 0;
 505
 506         /* issue task management function */
 507         fsf_req = zfcp_fsf_send_fcp_command_task_management
 508                 (adapter, unit, tm_flags, 0);
 509         if (!fsf_req) {
 510                 ZFCP_LOG_INFO("error: creation of task management request "
 511                               "failed for unit 0x%016Lx on port 0x%016Lx on  "
 512                               "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
 513                               zfcp_get_busid_by_adapter(adapter));
 514                 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
 515                 retval = -ENOMEM;
 516                 goto out;
 517         }
 518
 519         __wait_event(fsf_req->completion_wq,
 520                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 521
 522         /*
 523          * check completion status of task management function
 524          */
 525         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 526                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
 527                 retval = -EIO;
 528         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
 529                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
 530                 retval = -ENOTSUPP;
 531         } else
 532                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
 533
 534         zfcp_fsf_req_free(fsf_req);
 535  out:
 536         return retval;
 537 }
 538
 539 /**
 540  * zfcp_scsi_eh_host_reset_handler - handler for host and bus reset
 541  *
 542  * If ERP is already running it will be stopped.
 543  */
 544 int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 545 {
 546         struct zfcp_unit *unit;
 547         struct zfcp_adapter *adapter;
 548         unsigned long flags;
 549
 550         unit = (struct zfcp_unit*) scpnt->device->hostdata;
 551         adapter = unit->port->adapter;
 552
 553         ZFCP_LOG_NORMAL("host/bus reset because of problems with "
 554                         "unit 0x%016Lx\n", unit->fcp_lun);
 555
 556         write_lock_irqsave(&adapter->erp_lock, flags);
 557         if (atomic_test_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
 558                              &adapter->status)) {
 559                 zfcp_erp_modify_adapter_status(adapter,
 560                        ZFCP_STATUS_COMMON_UNBLOCKED|ZFCP_STATUS_COMMON_OPEN,
 561                        ZFCP_CLEAR);
 562                 zfcp_erp_action_dismiss_adapter(adapter);
 563                 write_unlock_irqrestore(&adapter->erp_lock, flags);
 564                 zfcp_fsf_req_dismiss_all(adapter);
 565                 adapter->fsf_req_seq_no = 0;
 566                 zfcp_erp_adapter_reopen(adapter, 0);
 567         } else {
 568                 write_unlock_irqrestore(&adapter->erp_lock, flags);
 569                 zfcp_erp_adapter_reopen(adapter, 0);
 570                 zfcp_erp_wait(adapter);
 571         }
 572
 573         return SUCCESS;
 574 }
 575
 576 int
 577 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 578 {
 579         int retval = 0;
 580         static unsigned int unique_id = 0;
 581
 582         /* register adapter as SCSI host with mid layer of SCSI stack */
 583         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 584                                              sizeof (struct zfcp_adapter *));
 585         if (!adapter->scsi_host) {
 586                 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
 587                                 "for adapter %s ",
 588                                 zfcp_get_busid_by_adapter(adapter));
 589                 retval = -EIO;
 590                 goto out;
 591         }
 592         ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
 593
 594         /* tell the SCSI stack some characteristics of this adapter */
 595         adapter->scsi_host->max_id = 1;
 596         adapter->scsi_host->max_lun = 1;
 597         adapter->scsi_host->max_channel = 0;
 598         adapter->scsi_host->unique_id = unique_id++;    /* FIXME */
 599         adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
 600         adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
 601
 602         /*
 603          * save a pointer to our own adapter data structure within
 604          * hostdata field of SCSI host data structure
 605          */
 606         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 607
 608         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 609                 scsi_host_put(adapter->scsi_host);
 610                 retval = -EIO;
 611                 goto out;
 612         }
 613         atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 614  out:
 615         return retval;
 616 }
 617
 618 void
 619 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 620 {
 621         struct Scsi_Host *shost;
 622         struct zfcp_port *port;
 623
 624         shost = adapter->scsi_host;
 625         if (!shost)
 626                 return;
 627         read_lock_irq(&zfcp_data.config_lock);
 628         list_for_each_entry(port, &adapter->port_list_head, list)
 629                 if (port->rport)
 630                         port->rport = NULL;
 631         read_unlock_irq(&zfcp_data.config_lock);
 632         fc_remove_host(shost);
 633         scsi_remove_host(shost);
 634         scsi_host_put(shost);
 635         adapter->scsi_host = NULL;
 636         atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 637
 638         return;
 639 }
 640
 641
 642 void
 643 zfcp_fsf_start_scsi_er_timer(struct zfcp_adapter *adapter)
 644 {
 645         adapter->scsi_er_timer.function = zfcp_fsf_scsi_er_timeout_handler;
 646         adapter->scsi_er_timer.data = (unsigned long) adapter;
 647         adapter->scsi_er_timer.expires = jiffies + ZFCP_SCSI_ER_TIMEOUT;
 648         add_timer(&adapter->scsi_er_timer);
 649 }
 650
 651 /*
 652  * Support functions for FC transport class
 653  */
 654 static struct fc_host_statistics*
 655 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 656 {
 657         struct fc_host_statistics *fc_stats;
 658
 659         if (!adapter->fc_stats) {
 660                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 661                 if (!fc_stats)
 662                         return NULL;
 663                 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
 664         }
 665         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 666         return adapter->fc_stats;
 667 }
 668
 669 static void
 670 zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 671                           struct fsf_qtcb_bottom_port *data,
 672                           struct fsf_qtcb_bottom_port *old)
 673 {
 674         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset -
 675                 old->seconds_since_last_reset;
 676         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 677         fc_stats->tx_words = data->tx_words - old->tx_words;
 678         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 679         fc_stats->rx_words = data->rx_words - old->rx_words;
 680         fc_stats->lip_count = data->lip - old->lip;
 681         fc_stats->nos_count = data->nos - old->nos;
 682         fc_stats->error_frames = data->error_frames - old->error_frames;
 683         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 684         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 685         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 686         fc_stats->loss_of_signal_count = data->loss_of_signal -
 687                 old->loss_of_signal;
 688         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts -
 689                 old->psp_error_counts;
 690         fc_stats->invalid_tx_word_count = data->invalid_tx_words -
 691                 old->invalid_tx_words;
 692         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 693         fc_stats->fcp_input_requests = data->input_requests -
 694                 old->input_requests;
 695         fc_stats->fcp_output_requests = data->output_requests -
 696                 old->output_requests;
 697         fc_stats->fcp_control_requests = data->control_requests -
 698                 old->control_requests;
 699         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 700         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 701 }
 702
 703 static void
 704 zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 705                        struct fsf_qtcb_bottom_port *data)
 706 {
 707         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 708         fc_stats->tx_frames = data->tx_frames;
 709         fc_stats->tx_words = data->tx_words;
 710         fc_stats->rx_frames = data->rx_frames;
 711         fc_stats->rx_words = data->rx_words;
 712         fc_stats->lip_count = data->lip;
 713         fc_stats->nos_count = data->nos;
 714         fc_stats->error_frames = data->error_frames;
 715         fc_stats->dumped_frames = data->dumped_frames;
 716         fc_stats->link_failure_count = data->link_failure;
 717         fc_stats->loss_of_sync_count = data->loss_of_sync;
 718         fc_stats->loss_of_signal_count = data->loss_of_signal;
 719         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 720         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 721         fc_stats->invalid_crc_count = data->invalid_crcs;
 722         fc_stats->fcp_input_requests = data->input_requests;
 723         fc_stats->fcp_output_requests = data->output_requests;
 724         fc_stats->fcp_control_requests = data->control_requests;
 725         fc_stats->fcp_input_megabytes = data->input_mb;
 726         fc_stats->fcp_output_megabytes = data->output_mb;
 727 }
 728
 729 /**
 730  * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc
 731  *
 732  * assumption: scsi_transport_fc synchronizes calls of
 733  *             get_fc_host_stats and reset_fc_host_stats
 734  *             (XXX to be checked otherwise introduce locking)
 735  */
 736 static struct fc_host_statistics *
 737 zfcp_get_fc_host_stats(struct Scsi_Host *shost)
 738 {
 739         struct zfcp_adapter *adapter;
 740         struct fc_host_statistics *fc_stats;
 741         struct fsf_qtcb_bottom_port *data;
 742         int ret;
 743
 744         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 745         fc_stats = zfcp_init_fc_host_stats(adapter);
 746         if (!fc_stats)
 747                 return NULL;
 748
 749         data = kzalloc(sizeof(*data), GFP_KERNEL);
 750         if (!data)
 751                 return NULL;
 752
 753         ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
 754         if (ret) {
 755                 kfree(data);
 756                 return NULL; /* XXX return zeroed fc_stats? */
 757         }
 758
 759         if (adapter->stats_reset &&
 760             ((jiffies/HZ - adapter->stats_reset) <
 761              data->seconds_since_last_reset)) {
 762                 zfcp_adjust_fc_host_stats(fc_stats, data,
 763                                           adapter->stats_reset_data);
 764         } else
 765                 zfcp_set_fc_host_stats(fc_stats, data);
 766
 767         kfree(data);
 768         return fc_stats;
 769 }
 770
 771 static void
 772 zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 773 {
 774         struct zfcp_adapter *adapter;
 775         struct fsf_qtcb_bottom_port *data, *old_data;
 776         int ret;
 777
 778         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 779         data = kzalloc(sizeof(*data), GFP_KERNEL);
 780         if (!data)
 781                 return;
 782
 783         ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
 784         if (ret == 0) {
 785                 adapter->stats_reset = jiffies/HZ;
 786                 old_data = adapter->stats_reset_data;
 787                 adapter->stats_reset_data = data; /* finally freed in
 788                                                      adater_dequeue */
 789                 kfree(old_data);
 790         }
 791 }
 792
 793 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 794 {
 795         rport->dev_loss_tmo = timeout;
 796 }
 797
 798 struct fc_function_template zfcp_transport_functions = {
 799         .show_starget_port_id = 1,
 800         .show_starget_port_name = 1,
 801         .show_starget_node_name = 1,
 802         .show_rport_supported_classes = 1,
 803         .show_rport_maxframe_size = 1,
 804         .show_rport_dev_loss_tmo = 1,
 805         .show_host_node_name = 1,
 806         .show_host_port_name = 1,
 807         .show_host_permanent_port_name = 1,
 808         .show_host_supported_classes = 1,
 809         .show_host_supported_speeds = 1,
 810         .show_host_maxframe_size = 1,
 811         .show_host_serial_number = 1,
 812         .get_fc_host_stats = zfcp_get_fc_host_stats,
 813         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 814         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 815         /* no functions registered for following dynamic attributes but
 816            directly set by LLDD */
 817         .show_host_port_type = 1,
 818         .show_host_speed = 1,
 819         .show_host_port_id = 1,
 820 };
 821
 822 /**
 823  * ZFCP_DEFINE_SCSI_ATTR
 824  * @_name:   name of show attribute
 825  * @_format: format string
 826  * @_value:  value to print
 827  *
 828  * Generates attribute for a unit.
 829  */
 830 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)                    \
 831 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr,        \
 832                                               char *buf)                 \
 833 {                                                                        \
 834         struct scsi_device *sdev;                                        \
 835         struct zfcp_unit *unit;                                          \
 836                                                                          \
 837         sdev = to_scsi_device(dev);                                      \
 838         unit = sdev->hostdata;                                           \
 839         return sprintf(buf, _format, _value);                            \
 840 }                                                                        \
 841                                                                          \
 842 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
 843
 844 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
 845 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
 846 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
 847
 848 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
 849         &dev_attr_fcp_lun,
 850         &dev_attr_wwpn,
 851         &dev_attr_hba_id,
 852         NULL
 853 };
 854
 855 #undef ZFCP_LOG_AREA