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                 .max_sectors            = ZFCP_MAX_SECTORS,
  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, int use_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, use_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  * @use_timer: indicates whether timer should be setup or not
 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                        int use_timer)
 303 {
 304         int ret;
 305         DECLARE_COMPLETION_ONSTACK(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,
 310                                       use_timer);
 311         if (ret == 0)
 312                 wait_for_completion(&wait);
 313
 314         scpnt->SCp.ptr = NULL;
 315
 316         return 0;
 317 }
 318
 319 /*
 320  * function:    zfcp_scsi_queuecommand
 321  *
 322  * purpose:     enqueues a SCSI command to the specified target device
 323  *
 324  * returns:     0 - success, SCSI command enqueued
 325  *              !0 - failure
 326  */
 327 int
 328 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
 329                        void (*done) (struct scsi_cmnd *))
 330 {
 331         struct zfcp_unit *unit;
 332         struct zfcp_adapter *adapter;
 333
 334         /* reset the status for this request */
 335         scpnt->result = 0;
 336         scpnt->host_scribble = NULL;
 337         scpnt->scsi_done = done;
 338
 339         /*
 340          * figure out adapter and target device
 341          * (stored there by zfcp_scsi_slave_alloc)
 342          */
 343         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
 344         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 345
 346         return zfcp_scsi_command_async(adapter, unit, scpnt, 0);
 347 }
 348
 349 static struct zfcp_unit *
 350 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, unsigned int id,
 351                  unsigned int lun)
 352 {
 353         struct zfcp_port *port;
 354         struct zfcp_unit *unit, *retval = NULL;
 355
 356         list_for_each_entry(port, &adapter->port_list_head, list) {
 357                 if (!port->rport || (id != port->rport->scsi_target_id))
 358                         continue;
 359                 list_for_each_entry(unit, &port->unit_list_head, list) {
 360                         if (lun == unit->scsi_lun) {
 361                                 retval = unit;
 362                                 goto out;
 363                         }
 364                 }
 365         }
 366  out:
 367         return retval;
 368 }
 369
 370 /**
 371  * zfcp_scsi_eh_abort_handler - abort the specified SCSI command
 372  * @scpnt: pointer to scsi_cmnd to be aborted
 373  * Return: SUCCESS - command has been aborted and cleaned up in internal
 374  *          bookkeeping, SCSI stack won't be called for aborted command
 375  *         FAILED - otherwise
 376  *
 377  * We do not need to care for a SCSI command which completes normally
 378  * but late during this abort routine runs.  We are allowed to return
 379  * late commands to the SCSI stack.  It tracks the state of commands and
 380  * will handle late commands.  (Usually, the normal completion of late
 381  * commands is ignored with respect to the running abort operation.)
 382  */
 383 int 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         struct zfcp_fsf_req *fsf_req;
 389         unsigned long flags;
 390         unsigned long old_req_id;
 391         int retval = SUCCESS;
 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         /* Check whether corresponding fsf_req is still pending */
 404         spin_lock(&adapter->req_list_lock);
 405         fsf_req = zfcp_reqlist_ismember(adapter, (unsigned long)
 406                                         scpnt->host_scribble);
 407         spin_unlock(&adapter->req_list_lock);
 408         if (!fsf_req) {
 409                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 410                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, 0);
 411                 retval = SUCCESS;
 412                 goto out;
 413         }
 414         fsf_req->data = 0;
 415         fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
 416         old_req_id = fsf_req->req_id;
 417
 418         /* don't access old fsf_req after releasing the abort_lock */
 419         write_unlock_irqrestore(&adapter->abort_lock, flags);
 420
 421         fsf_req = zfcp_fsf_abort_fcp_command(old_req_id, adapter, unit, 0);
 422         if (!fsf_req) {
 423                 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n");
 424                 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
 425                                           old_req_id);
 426                 retval = FAILED;
 427                 goto out;
 428         }
 429
 430         __wait_event(fsf_req->completion_wq,
 431                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 432
 433         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
 434                 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, fsf_req, 0);
 435                 retval = SUCCESS;
 436         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
 437                 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, fsf_req, 0);
 438                 retval = SUCCESS;
 439         } else {
 440                 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, fsf_req, 0);
 441                 retval = FAILED;
 442         }
 443         zfcp_fsf_req_free(fsf_req);
 444  out:
 445         return retval;
 446 }
 447
 448 int
 449 zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 450 {
 451         int retval;
 452         struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
 453
 454         if (!unit) {
 455                 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
 456                 retval = SUCCESS;
 457                 goto out;
 458         }
 459         ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun);
 460
 461         /*
 462          * If we do not know whether the unit supports 'logical unit reset'
 463          * then try 'logical unit reset' and proceed with 'target reset'
 464          * if 'logical unit reset' fails.
 465          * If the unit is known not to support 'logical unit reset' then
 466          * skip 'logical unit reset' and try 'target reset' immediately.
 467          */
 468         if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 469                               &unit->status)) {
 470                 retval = zfcp_task_management_function(unit,
 471                                                        FCP_LOGICAL_UNIT_RESET,
 472                                                        scpnt);
 473                 if (retval) {
 474                         ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit);
 475                         if (retval == -ENOTSUPP)
 476                                 atomic_set_mask
 477                                     (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 478                                      &unit->status);
 479                         /* fall through and try 'target reset' next */
 480                 } else {
 481                         ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n",
 482                                        unit);
 483                         /* avoid 'target reset' */
 484                         retval = SUCCESS;
 485                         goto out;
 486                 }
 487         }
 488         retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt);
 489         if (retval) {
 490                 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit);
 491                 retval = FAILED;
 492         } else {
 493                 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit);
 494                 retval = SUCCESS;
 495         }
 496  out:
 497         return retval;
 498 }
 499
 500 static int
 501 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags,
 502                               struct scsi_cmnd *scpnt)
 503 {
 504         struct zfcp_adapter *adapter = unit->port->adapter;
 505         struct zfcp_fsf_req *fsf_req;
 506         int retval = 0;
 507
 508         /* issue task management function */
 509         fsf_req = zfcp_fsf_send_fcp_command_task_management
 510                 (adapter, unit, tm_flags, 0);
 511         if (!fsf_req) {
 512                 ZFCP_LOG_INFO("error: creation of task management request "
 513                               "failed for unit 0x%016Lx on port 0x%016Lx on  "
 514                               "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
 515                               zfcp_get_busid_by_adapter(adapter));
 516                 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
 517                 retval = -ENOMEM;
 518                 goto out;
 519         }
 520
 521         __wait_event(fsf_req->completion_wq,
 522                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 523
 524         /*
 525          * check completion status of task management function
 526          */
 527         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 528                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
 529                 retval = -EIO;
 530         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
 531                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
 532                 retval = -ENOTSUPP;
 533         } else
 534                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
 535
 536         zfcp_fsf_req_free(fsf_req);
 537  out:
 538         return retval;
 539 }
 540
 541 /**
 542  * zfcp_scsi_eh_host_reset_handler - handler for host and bus reset
 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
 549         unit = (struct zfcp_unit*) scpnt->device->hostdata;
 550         adapter = unit->port->adapter;
 551
 552         ZFCP_LOG_NORMAL("host/bus reset because of problems with "
 553                         "unit 0x%016Lx\n", unit->fcp_lun);
 554
 555         zfcp_erp_adapter_reopen(adapter, 0);
 556         zfcp_erp_wait(adapter);
 557
 558         return SUCCESS;
 559 }
 560
 561 int
 562 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 563 {
 564         int retval = 0;
 565         static unsigned int unique_id = 0;
 566
 567         /* register adapter as SCSI host with mid layer of SCSI stack */
 568         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 569                                              sizeof (struct zfcp_adapter *));
 570         if (!adapter->scsi_host) {
 571                 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
 572                                 "for adapter %s ",
 573                                 zfcp_get_busid_by_adapter(adapter));
 574                 retval = -EIO;
 575                 goto out;
 576         }
 577         ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
 578
 579         /* tell the SCSI stack some characteristics of this adapter */
 580         adapter->scsi_host->max_id = 1;
 581         adapter->scsi_host->max_lun = 1;
 582         adapter->scsi_host->max_channel = 0;
 583         adapter->scsi_host->unique_id = unique_id++;    /* FIXME */
 584         adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
 585         adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
 586
 587         /*
 588          * save a pointer to our own adapter data structure within
 589          * hostdata field of SCSI host data structure
 590          */
 591         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 592
 593         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 594                 scsi_host_put(adapter->scsi_host);
 595                 retval = -EIO;
 596                 goto out;
 597         }
 598         atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 599  out:
 600         return retval;
 601 }
 602
 603 void
 604 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 605 {
 606         struct Scsi_Host *shost;
 607         struct zfcp_port *port;
 608
 609         shost = adapter->scsi_host;
 610         if (!shost)
 611                 return;
 612         read_lock_irq(&zfcp_data.config_lock);
 613         list_for_each_entry(port, &adapter->port_list_head, list)
 614                 if (port->rport)
 615                         port->rport = NULL;
 616         read_unlock_irq(&zfcp_data.config_lock);
 617         fc_remove_host(shost);
 618         scsi_remove_host(shost);
 619         scsi_host_put(shost);
 620         adapter->scsi_host = NULL;
 621         atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 622
 623         return;
 624 }
 625
 626 /*
 627  * Support functions for FC transport class
 628  */
 629 static struct fc_host_statistics*
 630 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 631 {
 632         struct fc_host_statistics *fc_stats;
 633
 634         if (!adapter->fc_stats) {
 635                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 636                 if (!fc_stats)
 637                         return NULL;
 638                 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
 639         }
 640         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 641         return adapter->fc_stats;
 642 }
 643
 644 static void
 645 zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 646                           struct fsf_qtcb_bottom_port *data,
 647                           struct fsf_qtcb_bottom_port *old)
 648 {
 649         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset -
 650                 old->seconds_since_last_reset;
 651         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 652         fc_stats->tx_words = data->tx_words - old->tx_words;
 653         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 654         fc_stats->rx_words = data->rx_words - old->rx_words;
 655         fc_stats->lip_count = data->lip - old->lip;
 656         fc_stats->nos_count = data->nos - old->nos;
 657         fc_stats->error_frames = data->error_frames - old->error_frames;
 658         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 659         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 660         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 661         fc_stats->loss_of_signal_count = data->loss_of_signal -
 662                 old->loss_of_signal;
 663         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts -
 664                 old->psp_error_counts;
 665         fc_stats->invalid_tx_word_count = data->invalid_tx_words -
 666                 old->invalid_tx_words;
 667         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 668         fc_stats->fcp_input_requests = data->input_requests -
 669                 old->input_requests;
 670         fc_stats->fcp_output_requests = data->output_requests -
 671                 old->output_requests;
 672         fc_stats->fcp_control_requests = data->control_requests -
 673                 old->control_requests;
 674         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 675         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 676 }
 677
 678 static void
 679 zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 680                        struct fsf_qtcb_bottom_port *data)
 681 {
 682         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 683         fc_stats->tx_frames = data->tx_frames;
 684         fc_stats->tx_words = data->tx_words;
 685         fc_stats->rx_frames = data->rx_frames;
 686         fc_stats->rx_words = data->rx_words;
 687         fc_stats->lip_count = data->lip;
 688         fc_stats->nos_count = data->nos;
 689         fc_stats->error_frames = data->error_frames;
 690         fc_stats->dumped_frames = data->dumped_frames;
 691         fc_stats->link_failure_count = data->link_failure;
 692         fc_stats->loss_of_sync_count = data->loss_of_sync;
 693         fc_stats->loss_of_signal_count = data->loss_of_signal;
 694         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 695         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 696         fc_stats->invalid_crc_count = data->invalid_crcs;
 697         fc_stats->fcp_input_requests = data->input_requests;
 698         fc_stats->fcp_output_requests = data->output_requests;
 699         fc_stats->fcp_control_requests = data->control_requests;
 700         fc_stats->fcp_input_megabytes = data->input_mb;
 701         fc_stats->fcp_output_megabytes = data->output_mb;
 702 }
 703
 704 /**
 705  * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc
 706  *
 707  * assumption: scsi_transport_fc synchronizes calls of
 708  *             get_fc_host_stats and reset_fc_host_stats
 709  *             (XXX to be checked otherwise introduce locking)
 710  */
 711 static struct fc_host_statistics *
 712 zfcp_get_fc_host_stats(struct Scsi_Host *shost)
 713 {
 714         struct zfcp_adapter *adapter;
 715         struct fc_host_statistics *fc_stats;
 716         struct fsf_qtcb_bottom_port *data;
 717         int ret;
 718
 719         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 720         fc_stats = zfcp_init_fc_host_stats(adapter);
 721         if (!fc_stats)
 722                 return NULL;
 723
 724         data = kzalloc(sizeof(*data), GFP_KERNEL);
 725         if (!data)
 726                 return NULL;
 727
 728         ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
 729         if (ret) {
 730                 kfree(data);
 731                 return NULL; /* XXX return zeroed fc_stats? */
 732         }
 733
 734         if (adapter->stats_reset &&
 735             ((jiffies/HZ - adapter->stats_reset) <
 736              data->seconds_since_last_reset)) {
 737                 zfcp_adjust_fc_host_stats(fc_stats, data,
 738                                           adapter->stats_reset_data);
 739         } else
 740                 zfcp_set_fc_host_stats(fc_stats, data);
 741
 742         kfree(data);
 743         return fc_stats;
 744 }
 745
 746 static void
 747 zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 748 {
 749         struct zfcp_adapter *adapter;
 750         struct fsf_qtcb_bottom_port *data, *old_data;
 751         int ret;
 752
 753         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 754         data = kzalloc(sizeof(*data), GFP_KERNEL);
 755         if (!data)
 756                 return;
 757
 758         ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
 759         if (ret == 0) {
 760                 adapter->stats_reset = jiffies/HZ;
 761                 old_data = adapter->stats_reset_data;
 762                 adapter->stats_reset_data = data; /* finally freed in
 763                                                      adater_dequeue */
 764                 kfree(old_data);
 765         }
 766 }
 767
 768 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 769 {
 770         rport->dev_loss_tmo = timeout;
 771 }
 772
 773 struct fc_function_template zfcp_transport_functions = {
 774         .show_starget_port_id = 1,
 775         .show_starget_port_name = 1,
 776         .show_starget_node_name = 1,
 777         .show_rport_supported_classes = 1,
 778         .show_rport_maxframe_size = 1,
 779         .show_rport_dev_loss_tmo = 1,
 780         .show_host_node_name = 1,
 781         .show_host_port_name = 1,
 782         .show_host_permanent_port_name = 1,
 783         .show_host_supported_classes = 1,
 784         .show_host_supported_speeds = 1,
 785         .show_host_maxframe_size = 1,
 786         .show_host_serial_number = 1,
 787         .get_fc_host_stats = zfcp_get_fc_host_stats,
 788         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 789         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 790         /* no functions registered for following dynamic attributes but
 791            directly set by LLDD */
 792         .show_host_port_type = 1,
 793         .show_host_speed = 1,
 794         .show_host_port_id = 1,
 795 };
 796
 797 /**
 798  * ZFCP_DEFINE_SCSI_ATTR
 799  * @_name:   name of show attribute
 800  * @_format: format string
 801  * @_value:  value to print
 802  *
 803  * Generates attribute for a unit.
 804  */
 805 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)                    \
 806 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr,        \
 807                                               char *buf)                 \
 808 {                                                                        \
 809         struct scsi_device *sdev;                                        \
 810         struct zfcp_unit *unit;                                          \
 811                                                                          \
 812         sdev = to_scsi_device(dev);                                      \
 813         unit = sdev->hostdata;                                           \
 814         return sprintf(buf, _format, _value);                            \
 815 }                                                                        \
 816                                                                          \
 817 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
 818
 819 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
 820 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
 821 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
 822
 823 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
 824         &dev_attr_fcp_lun,
 825         &dev_attr_wwpn,
 826         &dev_attr_hba_id,
 827         NULL
 828 };
 829
 830 #undef ZFCP_LOG_AREA