SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/s390/scsi/zfcp_scsi.c

   1 /*
   2  * This file is part of the zfcp device driver for
   3  * FCP adapters for IBM System z9 and zSeries.
   4  *
   5  * (C) Copyright IBM Corp. 2002, 2006
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_SCSI
  23
  24 #include "zfcp_ext.h"
  25 #include <asm/atomic.h>
  26
  27 static void zfcp_scsi_slave_destroy(struct scsi_device *sdp);
  28 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp);
  29 static int zfcp_scsi_slave_configure(struct scsi_device *sdp);
  30 static int zfcp_scsi_queuecommand(struct scsi_cmnd *,
  31                                   void (*done) (struct scsi_cmnd *));
  32 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *);
  33 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *);
  34 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *);
  35 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *);
  36 static int zfcp_task_management_function(struct zfcp_unit *, u8,
  37                                          struct scsi_cmnd *);
  38
  39 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int,
  40                                           unsigned int, unsigned int);
  41
  42 static struct device_attribute *zfcp_sysfs_sdev_attrs[];
  43 static struct device_attribute *zfcp_a_stats_attrs[];
  44
  45 struct zfcp_data zfcp_data = {
  46         .scsi_host_template = {
  47                 .name                   = ZFCP_NAME,
  48                 .module                 = THIS_MODULE,
  49                 .proc_name              = "zfcp",
  50                 .slave_alloc            = zfcp_scsi_slave_alloc,
  51                 .slave_configure        = zfcp_scsi_slave_configure,
  52                 .slave_destroy          = zfcp_scsi_slave_destroy,
  53                 .queuecommand           = zfcp_scsi_queuecommand,
  54                 .eh_abort_handler       = zfcp_scsi_eh_abort_handler,
  55                 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
  56                 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
  57                 .eh_host_reset_handler  = zfcp_scsi_eh_host_reset_handler,
  58                 .can_queue              = 4096,
  59                 .this_id                = -1,
  60                 .sg_tablesize           = ZFCP_MAX_SBALES_PER_REQ,
  61                 .cmd_per_lun            = 1,
  62                 .use_clustering         = 1,
  63                 .sdev_attrs             = zfcp_sysfs_sdev_attrs,
  64                 .max_sectors            = ZFCP_MAX_SECTORS,
  65                 .shost_attrs            = zfcp_a_stats_attrs,
  66         },
  67         .driver_version = ZFCP_VERSION,
  68 };
  69
  70 /* Find start of Response Information in FCP response unit*/
  71 char *
  72 zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  73 {
  74         char *fcp_rsp_info_ptr;
  75
  76         fcp_rsp_info_ptr =
  77             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
  78
  79         return fcp_rsp_info_ptr;
  80 }
  81
  82 /* Find start of Sense Information in FCP response unit*/
  83 char *
  84 zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  85 {
  86         char *fcp_sns_info_ptr;
  87
  88         fcp_sns_info_ptr =
  89             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
  90         if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
  91                 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr +
  92                     fcp_rsp_iu->fcp_rsp_len;
  93
  94         return fcp_sns_info_ptr;
  95 }
  96
  97 static fcp_dl_t *
  98 zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd)
  99 {
 100         int additional_length = fcp_cmd->add_fcp_cdb_length << 2;
 101         fcp_dl_t *fcp_dl_addr;
 102
 103         fcp_dl_addr = (fcp_dl_t *)
 104                 ((unsigned char *) fcp_cmd +
 105                  sizeof (struct fcp_cmnd_iu) + additional_length);
 106         /*
 107          * fcp_dl_addr = start address of fcp_cmnd structure +
 108          * size of fixed part + size of dynamically sized add_dcp_cdb field
 109          * SEE FCP-2 documentation
 110          */
 111         return fcp_dl_addr;
 112 }
 113
 114 fcp_dl_t
 115 zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd)
 116 {
 117         return *zfcp_get_fcp_dl_ptr(fcp_cmd);
 118 }
 119
 120 void
 121 zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
 122 {
 123         *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl;
 124 }
 125
 126 /*
 127  * note: it's a bit-or operation not an assignment
 128  * regarding the specified byte
 129  */
 130 static inline void
 131 set_byte(int *result, char status, char pos)
 132 {
 133         *result |= status << (pos * 8);
 134 }
 135
 136 void
 137 set_host_byte(int *result, char status)
 138 {
 139         set_byte(result, status, 2);
 140 }
 141
 142 void
 143 set_driver_byte(int *result, char status)
 144 {
 145         set_byte(result, status, 3);
 146 }
 147
 148 static int
 149 zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 150 {
 151         struct zfcp_adapter *adapter;
 152         struct zfcp_unit *unit;
 153         unsigned long flags;
 154         int retval = -ENXIO;
 155
 156         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 157         if (!adapter)
 158                 goto out;
 159
 160         read_lock_irqsave(&zfcp_data.config_lock, flags);
 161         unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
 162         if (unit && atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED,
 163                                      &unit->status)) {
 164                 sdp->hostdata = unit;
 165                 unit->device = sdp;
 166                 zfcp_unit_get(unit);
 167                 retval = 0;
 168         }
 169         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 170  out:
 171         return retval;
 172 }
 173
 174 /**
 175  * zfcp_scsi_slave_destroy - called when scsi device is removed
 176  *
 177  * Remove reference to associated scsi device for an zfcp_unit.
 178  * Mark zfcp_unit as failed. The scsi device might be deleted via sysfs
 179  * or a scan for this device might have failed.
 180  */
 181 static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
 182 {
 183         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
 184
 185         if (unit) {
 186                 atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status);
 187                 sdpnt->hostdata = NULL;
 188                 unit->device = NULL;
 189                 zfcp_erp_unit_failed(unit, 12, NULL);
 190                 zfcp_unit_put(unit);
 191         } else
 192                 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at "
 193                                 "address %p\n", sdpnt);
 194 }
 195
 196 /*
 197  * called from scsi midlayer to allow finetuning of a device.
 198  */
 199 static int
 200 zfcp_scsi_slave_configure(struct scsi_device *sdp)
 201 {
 202         if (sdp->tagged_supported)
 203                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN);
 204         else
 205                 scsi_adjust_queue_depth(sdp, 0, 1);
 206         return 0;
 207 }
 208
 209 /**
 210  * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function
 211  * @scpnt: pointer to struct scsi_cmnd where result is set
 212  * @result: result to be set in scpnt (e.g. DID_ERROR)
 213  */
 214 static void
 215 zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
 216 {
 217         set_host_byte(&scpnt->result, result);
 218         if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
 219                 zfcp_scsi_dbf_event_result("fail", 4,
 220                         (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
 221                         scpnt, NULL);
 222         /* return directly */
 223         scpnt->scsi_done(scpnt);
 224 }
 225
 226 /**
 227  * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and
 228  *      zfcp_scsi_command_sync
 229  * @adapter: adapter where scsi command is issued
 230  * @unit: unit to which scsi command is sent
 231  * @scpnt: scsi command to be sent
 232  * @timer: timer to be started if request is successfully initiated
 233  *
 234  * Note: In scsi_done function must be set in scpnt.
 235  */
 236 int
 237 zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit,
 238                         struct scsi_cmnd *scpnt, int use_timer)
 239 {
 240         int tmp;
 241         int retval;
 242
 243         retval = 0;
 244
 245         BUG_ON((adapter == NULL) || (adapter != unit->port->adapter));
 246         BUG_ON(scpnt->scsi_done == NULL);
 247
 248         if (unlikely(NULL == unit)) {
 249                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
 250                 goto out;
 251         }
 252
 253         if (unlikely(
 254               atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) ||
 255              !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) {
 256                 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port "
 257                                "0x%016Lx on adapter %s\n",
 258                                unit->fcp_lun, unit->port->wwpn,
 259                                zfcp_get_busid_by_adapter(adapter));
 260                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 261                 goto out;
 262         }
 263
 264         tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, use_timer,
 265                                              ZFCP_REQ_AUTO_CLEANUP);
 266         if (unlikely(tmp == -EBUSY)) {
 267                 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx "
 268                                "on port 0x%016Lx in recovery\n",
 269                                zfcp_get_busid_by_unit(unit),
 270                                unit->fcp_lun, unit->port->wwpn);
 271                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
 272                 goto out;
 273         }
 274
 275         if (unlikely(tmp < 0)) {
 276                 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n");
 277                 retval = SCSI_MLQUEUE_HOST_BUSY;
 278         }
 279
 280 out:
 281         return retval;
 282 }
 283
 284 static void
 285 zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt)
 286 {
 287         struct completion *wait = (struct completion *) scpnt->SCp.ptr;
 288         complete(wait);
 289 }
 290
 291
 292 /**
 293  * zfcp_scsi_command_sync - send a SCSI command and wait for completion
 294  * @unit: unit where command is sent to
 295  * @scpnt: scsi command to be sent
 296  * @use_timer: indicates whether timer should be setup or not
 297  * Return: 0
 298  *
 299  * Errors are indicated in scpnt->result
 300  */
 301 int
 302 zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt,
 303                        int use_timer)
 304 {
 305         int ret;
 306         DECLARE_COMPLETION_ONSTACK(wait);
 307
 308         scpnt->SCp.ptr = (void *) &wait;  /* silent re-use */
 309         scpnt->scsi_done = zfcp_scsi_command_sync_handler;
 310         ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt,
 311                                       use_timer);
 312         if (ret == 0)
 313                 wait_for_completion(&wait);
 314
 315         scpnt->SCp.ptr = NULL;
 316
 317         return 0;
 318 }
 319
 320 /*
 321  * function:    zfcp_scsi_queuecommand
 322  *
 323  * purpose:     enqueues a SCSI command to the specified target device
 324  *
 325  * returns:     0 - success, SCSI command enqueued
 326  *              !0 - failure
 327  */
 328 static int
 329 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
 330                        void (*done) (struct scsi_cmnd *))
 331 {
 332         struct zfcp_unit *unit;
 333         struct zfcp_adapter *adapter;
 334
 335         /* reset the status for this request */
 336         scpnt->result = 0;
 337         scpnt->host_scribble = NULL;
 338         scpnt->scsi_done = done;
 339
 340         /*
 341          * figure out adapter and target device
 342          * (stored there by zfcp_scsi_slave_alloc)
 343          */
 344         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
 345         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 346
 347         return zfcp_scsi_command_async(adapter, unit, scpnt, 0);
 348 }
 349
 350 static struct zfcp_unit *
 351 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, unsigned int id,
 352                  unsigned int lun)
 353 {
 354         struct zfcp_port *port;
 355         struct zfcp_unit *unit, *retval = NULL;
 356
 357         list_for_each_entry(port, &adapter->port_list_head, list) {
 358                 if (!port->rport || (id != port->rport->scsi_target_id))
 359                         continue;
 360                 list_for_each_entry(unit, &port->unit_list_head, list)
 361                         if (lun == unit->scsi_lun) {
 362                                 retval = unit;
 363                                 goto out;
 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 static 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_find(adapter,
 406                                     (unsigned long) 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 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 449 {
 450         int retval;
 451         struct zfcp_unit *unit = scpnt->device->hostdata;
 452
 453         if (!unit) {
 454                 WARN_ON(1);
 455                 return SUCCESS;
 456         }
 457         retval = zfcp_task_management_function(unit,
 458                                                FCP_LOGICAL_UNIT_RESET,
 459                                                scpnt);
 460         return retval ? FAILED : SUCCESS;
 461 }
 462
 463 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 464 {
 465         int retval;
 466         struct zfcp_unit *unit = scpnt->device->hostdata;
 467
 468         if (!unit) {
 469                 WARN_ON(1);
 470                 return SUCCESS;
 471         }
 472         retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt);
 473         return retval ? FAILED : SUCCESS;
 474 }
 475
 476 static int
 477 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags,
 478                               struct scsi_cmnd *scpnt)
 479 {
 480         struct zfcp_adapter *adapter = unit->port->adapter;
 481         struct zfcp_fsf_req *fsf_req;
 482         int retval = 0;
 483
 484         /* issue task management function */
 485         fsf_req = zfcp_fsf_send_fcp_command_task_management
 486                 (adapter, unit, tm_flags, 0);
 487         if (!fsf_req) {
 488                 ZFCP_LOG_INFO("error: creation of task management request "
 489                               "failed for unit 0x%016Lx on port 0x%016Lx on  "
 490                               "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
 491                               zfcp_get_busid_by_adapter(adapter));
 492                 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
 493                 retval = -ENOMEM;
 494                 goto out;
 495         }
 496
 497         __wait_event(fsf_req->completion_wq,
 498                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 499
 500         /*
 501          * check completion status of task management function
 502          */
 503         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 504                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
 505                 retval = -EIO;
 506         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
 507                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
 508                 retval = -ENOTSUPP;
 509         } else
 510                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
 511
 512         zfcp_fsf_req_free(fsf_req);
 513  out:
 514         return retval;
 515 }
 516
 517 /**
 518  * zfcp_scsi_eh_host_reset_handler - handler for host reset
 519  */
 520 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 521 {
 522         struct zfcp_unit *unit;
 523         struct zfcp_adapter *adapter;
 524
 525         unit = (struct zfcp_unit*) scpnt->device->hostdata;
 526         adapter = unit->port->adapter;
 527
 528         ZFCP_LOG_NORMAL("host reset because of problems with "
 529                 "unit 0x%016Lx on port 0x%016Lx, adapter %s\n",
 530                 unit->fcp_lun, unit->port->wwpn,
 531                 zfcp_get_busid_by_adapter(unit->port->adapter));
 532
 533         zfcp_erp_adapter_reopen(adapter, 0, 141, scpnt);
 534         zfcp_erp_wait(adapter);
 535
 536         return SUCCESS;
 537 }
 538
 539 int
 540 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 541 {
 542         int retval = 0;
 543         static unsigned int unique_id = 0;
 544
 545         if (adapter->scsi_host)
 546                 goto out;
 547
 548         /* register adapter as SCSI host with mid layer of SCSI stack */
 549         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 550                                              sizeof (struct zfcp_adapter *));
 551         if (!adapter->scsi_host) {
 552                 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
 553                                 "for adapter %s ",
 554                                 zfcp_get_busid_by_adapter(adapter));
 555                 retval = -EIO;
 556                 goto out;
 557         }
 558         ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
 559
 560         /* tell the SCSI stack some characteristics of this adapter */
 561         adapter->scsi_host->max_id = 1;
 562         adapter->scsi_host->max_lun = 1;
 563         adapter->scsi_host->max_channel = 0;
 564         adapter->scsi_host->unique_id = unique_id++;    /* FIXME */
 565         adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
 566         adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
 567
 568         /*
 569          * save a pointer to our own adapter data structure within
 570          * hostdata field of SCSI host data structure
 571          */
 572         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 573
 574         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 575                 scsi_host_put(adapter->scsi_host);
 576                 retval = -EIO;
 577                 goto out;
 578         }
 579         atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 580  out:
 581         return retval;
 582 }
 583
 584 void
 585 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 586 {
 587         struct Scsi_Host *shost;
 588         struct zfcp_port *port;
 589
 590         shost = adapter->scsi_host;
 591         if (!shost)
 592                 return;
 593         read_lock_irq(&zfcp_data.config_lock);
 594         list_for_each_entry(port, &adapter->port_list_head, list)
 595                 if (port->rport)
 596                         port->rport = NULL;
 597         read_unlock_irq(&zfcp_data.config_lock);
 598         fc_remove_host(shost);
 599         scsi_remove_host(shost);
 600         scsi_host_put(shost);
 601         adapter->scsi_host = NULL;
 602         atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 603
 604         return;
 605 }
 606
 607 /*
 608  * Support functions for FC transport class
 609  */
 610 static struct fc_host_statistics*
 611 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 612 {
 613         struct fc_host_statistics *fc_stats;
 614
 615         if (!adapter->fc_stats) {
 616                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 617                 if (!fc_stats)
 618                         return NULL;
 619                 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
 620         }
 621         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 622         return adapter->fc_stats;
 623 }
 624
 625 static void
 626 zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 627                           struct fsf_qtcb_bottom_port *data,
 628                           struct fsf_qtcb_bottom_port *old)
 629 {
 630         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset -
 631                 old->seconds_since_last_reset;
 632         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 633         fc_stats->tx_words = data->tx_words - old->tx_words;
 634         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 635         fc_stats->rx_words = data->rx_words - old->rx_words;
 636         fc_stats->lip_count = data->lip - old->lip;
 637         fc_stats->nos_count = data->nos - old->nos;
 638         fc_stats->error_frames = data->error_frames - old->error_frames;
 639         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 640         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 641         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 642         fc_stats->loss_of_signal_count = data->loss_of_signal -
 643                 old->loss_of_signal;
 644         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts -
 645                 old->psp_error_counts;
 646         fc_stats->invalid_tx_word_count = data->invalid_tx_words -
 647                 old->invalid_tx_words;
 648         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 649         fc_stats->fcp_input_requests = data->input_requests -
 650                 old->input_requests;
 651         fc_stats->fcp_output_requests = data->output_requests -
 652                 old->output_requests;
 653         fc_stats->fcp_control_requests = data->control_requests -
 654                 old->control_requests;
 655         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 656         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 657 }
 658
 659 static void
 660 zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 661                        struct fsf_qtcb_bottom_port *data)
 662 {
 663         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 664         fc_stats->tx_frames = data->tx_frames;
 665         fc_stats->tx_words = data->tx_words;
 666         fc_stats->rx_frames = data->rx_frames;
 667         fc_stats->rx_words = data->rx_words;
 668         fc_stats->lip_count = data->lip;
 669         fc_stats->nos_count = data->nos;
 670         fc_stats->error_frames = data->error_frames;
 671         fc_stats->dumped_frames = data->dumped_frames;
 672         fc_stats->link_failure_count = data->link_failure;
 673         fc_stats->loss_of_sync_count = data->loss_of_sync;
 674         fc_stats->loss_of_signal_count = data->loss_of_signal;
 675         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 676         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 677         fc_stats->invalid_crc_count = data->invalid_crcs;
 678         fc_stats->fcp_input_requests = data->input_requests;
 679         fc_stats->fcp_output_requests = data->output_requests;
 680         fc_stats->fcp_control_requests = data->control_requests;
 681         fc_stats->fcp_input_megabytes = data->input_mb;
 682         fc_stats->fcp_output_megabytes = data->output_mb;
 683 }
 684
 685 /**
 686  * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc
 687  *
 688  * assumption: scsi_transport_fc synchronizes calls of
 689  *             get_fc_host_stats and reset_fc_host_stats
 690  *             (XXX to be checked otherwise introduce locking)
 691  */
 692 static struct fc_host_statistics *
 693 zfcp_get_fc_host_stats(struct Scsi_Host *shost)
 694 {
 695         struct zfcp_adapter *adapter;
 696         struct fc_host_statistics *fc_stats;
 697         struct fsf_qtcb_bottom_port *data;
 698         int ret;
 699
 700         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 701         fc_stats = zfcp_init_fc_host_stats(adapter);
 702         if (!fc_stats)
 703                 return NULL;
 704
 705         data = kzalloc(sizeof(*data), GFP_KERNEL);
 706         if (!data)
 707                 return NULL;
 708
 709         ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
 710         if (ret) {
 711                 kfree(data);
 712                 return NULL; /* XXX return zeroed fc_stats? */
 713         }
 714
 715         if (adapter->stats_reset &&
 716             ((jiffies/HZ - adapter->stats_reset) <
 717              data->seconds_since_last_reset)) {
 718                 zfcp_adjust_fc_host_stats(fc_stats, data,
 719                                           adapter->stats_reset_data);
 720         } else
 721                 zfcp_set_fc_host_stats(fc_stats, data);
 722
 723         kfree(data);
 724         return fc_stats;
 725 }
 726
 727 static void
 728 zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 729 {
 730         struct zfcp_adapter *adapter;
 731         struct fsf_qtcb_bottom_port *data, *old_data;
 732         int ret;
 733
 734         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 735         data = kzalloc(sizeof(*data), GFP_KERNEL);
 736         if (!data)
 737                 return;
 738
 739         ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
 740         if (ret) {
 741                 kfree(data);
 742         } else {
 743                 adapter->stats_reset = jiffies/HZ;
 744                 old_data = adapter->stats_reset_data;
 745                 adapter->stats_reset_data = data; /* finally freed in
 746                                                      adater_dequeue */
 747                 kfree(old_data);
 748         }
 749 }
 750
 751 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 752 {
 753         rport->dev_loss_tmo = timeout;
 754 }
 755
 756 struct fc_function_template zfcp_transport_functions = {
 757         .show_starget_port_id = 1,
 758         .show_starget_port_name = 1,
 759         .show_starget_node_name = 1,
 760         .show_rport_supported_classes = 1,
 761         .show_rport_maxframe_size = 1,
 762         .show_rport_dev_loss_tmo = 1,
 763         .show_host_node_name = 1,
 764         .show_host_port_name = 1,
 765         .show_host_permanent_port_name = 1,
 766         .show_host_supported_classes = 1,
 767         .show_host_supported_speeds = 1,
 768         .show_host_maxframe_size = 1,
 769         .show_host_serial_number = 1,
 770         .get_fc_host_stats = zfcp_get_fc_host_stats,
 771         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 772         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 773         /* no functions registered for following dynamic attributes but
 774            directly set by LLDD */
 775         .show_host_port_type = 1,
 776         .show_host_speed = 1,
 777         .show_host_port_id = 1,
 778         .disable_target_scan = 1,
 779 };
 780
 781 #define ZFCP_DEFINE_LATENCY_ATTR(_name)                                 \
 782 static ssize_t                                                          \
 783 zfcp_sysfs_unit_##_name##_latency_show(struct device *dev,              \
 784                                        struct device_attribute *attr,   \
 785                                        char *buf) {                     \
 786         struct scsi_device *sdev = to_scsi_device(dev);                 \
 787         struct zfcp_unit *unit = sdev->hostdata;                        \
 788         struct zfcp_latencies *lat = &unit->latencies;                  \
 789         struct zfcp_adapter *adapter = unit->port->adapter;             \
 790         unsigned long flags;                                            \
 791         unsigned long long fsum, fmin, fmax, csum, cmin, cmax, cc;      \
 792                                                                         \
 793         spin_lock_irqsave(&lat->lock, flags);                           \
 794         fsum = lat->_name.fabric.sum * adapter->timer_ticks;            \
 795         fmin = lat->_name.fabric.min * adapter->timer_ticks;            \
 796         fmax = lat->_name.fabric.max * adapter->timer_ticks;            \
 797         csum = lat->_name.channel.sum * adapter->timer_ticks;           \
 798         cmin = lat->_name.channel.min * adapter->timer_ticks;           \
 799         cmax = lat->_name.channel.max * adapter->timer_ticks;           \
 800         cc  = lat->_name.counter;                                       \
 801         spin_unlock_irqrestore(&lat->lock, flags);                      \
 802                                                                         \
 803         do_div(fsum, 1000);                                             \
 804         do_div(fmin, 1000);                                             \
 805         do_div(fmax, 1000);                                             \
 806         do_div(csum, 1000);                                             \
 807         do_div(cmin, 1000);                                             \
 808         do_div(cmax, 1000);                                             \
 809                                                                         \
 810         return sprintf(buf, "%llu %llu %llu %llu %llu %llu %llu\n",     \
 811                        fmin, fmax, fsum, cmin, cmax, csum, cc);         \
 812 }                                                                       \
 813 static ssize_t                                                          \
 814 zfcp_sysfs_unit_##_name##_latency_store(struct device *dev,             \
 815                                         struct device_attribute *attr,  \
 816                                         const char *buf, size_t count)  \
 817 {                                                                       \
 818         struct scsi_device *sdev = to_scsi_device(dev);                 \
 819         struct zfcp_unit *unit = sdev->hostdata;                        \
 820         struct zfcp_latencies *lat = &unit->latencies;                  \
 821         unsigned long flags;                                            \
 822                                                                         \
 823         spin_lock_irqsave(&lat->lock, flags);                           \
 824         lat->_name.fabric.sum = 0;                                      \
 825         lat->_name.fabric.min = 0xFFFFFFFF;                             \
 826         lat->_name.fabric.max = 0;                                      \
 827         lat->_name.channel.sum = 0;                                     \
 828         lat->_name.channel.min = 0xFFFFFFFF;                            \
 829         lat->_name.channel.max = 0;                                     \
 830         lat->_name.counter = 0;                                         \
 831         spin_unlock_irqrestore(&lat->lock, flags);                      \
 832                                                                         \
 833         return (ssize_t) count;                                         \
 834 }                                                                       \
 835 static DEVICE_ATTR(_name##_latency, S_IWUSR | S_IRUGO,                  \
 836                    zfcp_sysfs_unit_##_name##_latency_show,              \
 837                    zfcp_sysfs_unit_##_name##_latency_store);
 838
 839 ZFCP_DEFINE_LATENCY_ATTR(read);
 840 ZFCP_DEFINE_LATENCY_ATTR(write);
 841 ZFCP_DEFINE_LATENCY_ATTR(cmd);
 842
 843 /**
 844  * ZFCP_DEFINE_SCSI_ATTR
 845  * @_name:   name of show attribute
 846  * @_format: format string
 847  * @_value:  value to print
 848  *
 849  * Generates attribute for a unit.
 850  */
 851 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)                    \
 852 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr,        \
 853                                               char *buf)                 \
 854 {                                                                        \
 855         struct scsi_device *sdev;                                        \
 856         struct zfcp_unit *unit;                                          \
 857                                                                          \
 858         sdev = to_scsi_device(dev);                                      \
 859         unit = sdev->hostdata;                                           \
 860         return sprintf(buf, _format, _value);                            \
 861 }                                                                        \
 862                                                                          \
 863 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
 864
 865 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
 866 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
 867 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
 868
 869 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
 870         &dev_attr_fcp_lun,
 871         &dev_attr_wwpn,
 872         &dev_attr_hba_id,
 873         &dev_attr_read_latency,
 874         &dev_attr_write_latency,
 875         &dev_attr_cmd_latency,
 876         NULL
 877 };
 878
 879 static ssize_t zfcp_sysfs_adapter_util_show(struct device *dev,
 880                                             struct device_attribute *attr,
 881                                             char *buf)
 882 {
 883         struct Scsi_Host *scsi_host = dev_to_shost(dev);
 884         struct fsf_qtcb_bottom_port *qtcb_port;
 885         int retval;
 886         struct zfcp_adapter *adapter;
 887
 888         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
 889         if (!(adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA))
 890                 return -EOPNOTSUPP;
 891
 892         qtcb_port = kzalloc(sizeof(struct fsf_qtcb_bottom_port), GFP_KERNEL);
 893         if (!qtcb_port)
 894                 return -ENOMEM;
 895
 896         retval = zfcp_fsf_exchange_port_data_sync(adapter, qtcb_port);
 897         if (!retval)
 898                 retval = sprintf(buf, "%u %u %u\n", qtcb_port->cp_util,
 899                                  qtcb_port->cb_util, qtcb_port->a_util);
 900         kfree(qtcb_port);
 901         return retval;
 902 }
 903
 904 static int zfcp_sysfs_adapter_ex_config(struct device *dev,
 905                                         struct fsf_statistics_info *stat_inf)
 906 {
 907         int retval;
 908         struct fsf_qtcb_bottom_config *qtcb_config;
 909         struct Scsi_Host *scsi_host = dev_to_shost(dev);
 910         struct zfcp_adapter *adapter;
 911
 912         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
 913         if (!(adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA))
 914                 return -EOPNOTSUPP;
 915
 916         qtcb_config = kzalloc(sizeof(struct fsf_qtcb_bottom_config),
 917                                GFP_KERNEL);
 918         if (!qtcb_config)
 919                 return -ENOMEM;
 920
 921         retval = zfcp_fsf_exchange_config_data_sync(adapter, qtcb_config);
 922         if (!retval)
 923                 *stat_inf = qtcb_config->stat_info;
 924
 925         kfree(qtcb_config);
 926         return retval;
 927 }
 928
 929 static ssize_t zfcp_sysfs_adapter_request_show(struct device *dev,
 930                                                struct device_attribute *attr,
 931                                                char *buf)
 932 {
 933         struct fsf_statistics_info stat_info;
 934         int retval;
 935
 936         retval = zfcp_sysfs_adapter_ex_config(dev, &stat_info);
 937         if (retval)
 938                 return retval;
 939
 940         return sprintf(buf, "%llu %llu %llu\n",
 941                        (unsigned long long) stat_info.input_req,
 942                        (unsigned long long) stat_info.output_req,
 943                        (unsigned long long) stat_info.control_req);
 944 }
 945
 946 static ssize_t zfcp_sysfs_adapter_mb_show(struct device *dev,
 947                                           struct device_attribute *attr,
 948                                           char *buf)
 949 {
 950         struct fsf_statistics_info stat_info;
 951         int retval;
 952
 953         retval = zfcp_sysfs_adapter_ex_config(dev, &stat_info);
 954         if (retval)
 955                 return retval;
 956
 957         return sprintf(buf, "%llu %llu\n",
 958                        (unsigned long long) stat_info.input_mb,
 959                        (unsigned long long) stat_info.output_mb);
 960 }
 961
 962 static ssize_t zfcp_sysfs_adapter_sec_active_show(struct device *dev,
 963                                                   struct device_attribute *attr,
 964                                                   char *buf)
 965 {
 966         struct fsf_statistics_info stat_info;
 967         int retval;
 968
 969         retval = zfcp_sysfs_adapter_ex_config(dev, &stat_info);
 970         if (retval)
 971                 return retval;
 972
 973         return sprintf(buf, "%llu\n",
 974                        (unsigned long long) stat_info.seconds_act);
 975 }
 976
 977 static DEVICE_ATTR(utilization, S_IRUGO, zfcp_sysfs_adapter_util_show, NULL);
 978 static DEVICE_ATTR(requests, S_IRUGO, zfcp_sysfs_adapter_request_show, NULL);
 979 static DEVICE_ATTR(megabytes, S_IRUGO, zfcp_sysfs_adapter_mb_show, NULL);
 980 static DEVICE_ATTR(seconds_active, S_IRUGO,
 981                    zfcp_sysfs_adapter_sec_active_show, NULL);
 982
 983 static struct device_attribute *zfcp_a_stats_attrs[] = {
 984         &dev_attr_utilization,
 985         &dev_attr_requests,
 986         &dev_attr_megabytes,
 987         &dev_attr_seconds_active,
 988         NULL
 989 };
 990
 991 #undef ZFCP_LOG_AREA