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, int use_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, use_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  * @use_timer: indicates whether timer should be setup or not
 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                        int use_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,
 309                                       use_timer);
 310         if (ret == 0)
 311                 wait_for_completion(&wait);
 312
 313         scpnt->SCp.ptr = NULL;
 314
 315         return 0;
 316 }
 317
 318 /*
 319  * function:    zfcp_scsi_queuecommand
 320  *
 321  * purpose:     enqueues a SCSI command to the specified target device
 322  *
 323  * returns:     0 - success, SCSI command enqueued
 324  *              !0 - failure
 325  */
 326 int
 327 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
 328                        void (*done) (struct scsi_cmnd *))
 329 {
 330         struct zfcp_unit *unit;
 331         struct zfcp_adapter *adapter;
 332
 333         /* reset the status for this request */
 334         scpnt->result = 0;
 335         scpnt->host_scribble = NULL;
 336         scpnt->scsi_done = done;
 337
 338         /*
 339          * figure out adapter and target device
 340          * (stored there by zfcp_scsi_slave_alloc)
 341          */
 342         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
 343         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 344
 345         return zfcp_scsi_command_async(adapter, unit, scpnt, 0);
 346 }
 347
 348 static struct zfcp_unit *
 349 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, unsigned int id,
 350                  unsigned int lun)
 351 {
 352         struct zfcp_port *port;
 353         struct zfcp_unit *unit, *retval = NULL;
 354
 355         list_for_each_entry(port, &adapter->port_list_head, list) {
 356                 if (!port->rport || (id != port->rport->scsi_target_id))
 357                         continue;
 358                 list_for_each_entry(unit, &port->unit_list_head, list) {
 359                         if (lun == unit->scsi_lun) {
 360                                 retval = unit;
 361                                 goto out;
 362                         }
 363                 }
 364         }
 365  out:
 366         return retval;
 367 }
 368
 369 /**
 370  * zfcp_scsi_eh_abort_handler - abort the specified SCSI command
 371  * @scpnt: pointer to scsi_cmnd to be aborted
 372  * Return: SUCCESS - command has been aborted and cleaned up in internal
 373  *          bookkeeping, SCSI stack won't be called for aborted command
 374  *         FAILED - otherwise
 375  *
 376  * We do not need to care for a SCSI command which completes normally
 377  * but late during this abort routine runs.  We are allowed to return
 378  * late commands to the SCSI stack.  It tracks the state of commands and
 379  * will handle late commands.  (Usually, the normal completion of late
 380  * commands is ignored with respect to the running abort operation.)
 381  */
 382 int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 383 {
 384         struct Scsi_Host *scsi_host;
 385         struct zfcp_adapter *adapter;
 386         struct zfcp_unit *unit;
 387         struct zfcp_fsf_req *fsf_req;
 388         unsigned long flags;
 389         unsigned long old_req_id;
 390         int retval = SUCCESS;
 391
 392         scsi_host = scpnt->device->host;
 393         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
 394         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 395
 396         ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
 397                       scpnt, zfcp_get_busid_by_adapter(adapter));
 398
 399         /* avoid race condition between late normal completion and abort */
 400         write_lock_irqsave(&adapter->abort_lock, flags);
 401
 402         /* Check whether corresponding fsf_req is still pending */
 403         spin_lock(&adapter->req_list_lock);
 404         fsf_req = zfcp_reqlist_ismember(adapter, (unsigned long)
 405                                         scpnt->host_scribble);
 406         spin_unlock(&adapter->req_list_lock);
 407         if (!fsf_req) {
 408                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 409                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, 0);
 410                 retval = SUCCESS;
 411                 goto out;
 412         }
 413         fsf_req->data = 0;
 414         fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
 415         old_req_id = fsf_req->req_id;
 416
 417         /* don't access old fsf_req after releasing the abort_lock */
 418         write_unlock_irqrestore(&adapter->abort_lock, flags);
 419
 420         fsf_req = zfcp_fsf_abort_fcp_command(old_req_id, adapter, unit, 0);
 421         if (!fsf_req) {
 422                 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n");
 423                 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
 424                                           old_req_id);
 425                 retval = FAILED;
 426                 goto out;
 427         }
 428
 429         __wait_event(fsf_req->completion_wq,
 430                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 431
 432         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
 433                 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, fsf_req, 0);
 434                 retval = SUCCESS;
 435         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
 436                 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, fsf_req, 0);
 437                 retval = SUCCESS;
 438         } else {
 439                 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, fsf_req, 0);
 440                 retval = FAILED;
 441         }
 442         zfcp_fsf_req_free(fsf_req);
 443  out:
 444         return retval;
 445 }
 446
 447 int
 448 zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 449 {
 450         int retval;
 451         struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
 452
 453         if (!unit) {
 454                 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
 455                 retval = SUCCESS;
 456                 goto out;
 457         }
 458         ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun);
 459
 460         /*
 461          * If we do not know whether the unit supports 'logical unit reset'
 462          * then try 'logical unit reset' and proceed with 'target reset'
 463          * if 'logical unit reset' fails.
 464          * If the unit is known not to support 'logical unit reset' then
 465          * skip 'logical unit reset' and try 'target reset' immediately.
 466          */
 467         if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 468                               &unit->status)) {
 469                 retval = zfcp_task_management_function(unit,
 470                                                        FCP_LOGICAL_UNIT_RESET,
 471                                                        scpnt);
 472                 if (retval) {
 473                         ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit);
 474                         if (retval == -ENOTSUPP)
 475                                 atomic_set_mask
 476                                     (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 477                                      &unit->status);
 478                         /* fall through and try 'target reset' next */
 479                 } else {
 480                         ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n",
 481                                        unit);
 482                         /* avoid 'target reset' */
 483                         retval = SUCCESS;
 484                         goto out;
 485                 }
 486         }
 487         retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt);
 488         if (retval) {
 489                 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit);
 490                 retval = FAILED;
 491         } else {
 492                 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit);
 493                 retval = SUCCESS;
 494         }
 495  out:
 496         return retval;
 497 }
 498
 499 static int
 500 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags,
 501                               struct scsi_cmnd *scpnt)
 502 {
 503         struct zfcp_adapter *adapter = unit->port->adapter;
 504         struct zfcp_fsf_req *fsf_req;
 505         int retval = 0;
 506
 507         /* issue task management function */
 508         fsf_req = zfcp_fsf_send_fcp_command_task_management
 509                 (adapter, unit, tm_flags, 0);
 510         if (!fsf_req) {
 511                 ZFCP_LOG_INFO("error: creation of task management request "
 512                               "failed for unit 0x%016Lx on port 0x%016Lx on  "
 513                               "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
 514                               zfcp_get_busid_by_adapter(adapter));
 515                 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
 516                 retval = -ENOMEM;
 517                 goto out;
 518         }
 519
 520         __wait_event(fsf_req->completion_wq,
 521                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 522
 523         /*
 524          * check completion status of task management function
 525          */
 526         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 527                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
 528                 retval = -EIO;
 529         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
 530                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
 531                 retval = -ENOTSUPP;
 532         } else
 533                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
 534
 535         zfcp_fsf_req_free(fsf_req);
 536  out:
 537         return retval;
 538 }
 539
 540 /**
 541  * zfcp_scsi_eh_host_reset_handler - handler for host and bus reset
 542  */
 543 int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 544 {
 545         struct zfcp_unit *unit;
 546         struct zfcp_adapter *adapter;
 547         unsigned long flags;
 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         write_lock_irqsave(&adapter->erp_lock, flags);
 556         if (atomic_test_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
 557                              &adapter->status)) {
 558                 zfcp_erp_modify_adapter_status(adapter,
 559                        ZFCP_STATUS_COMMON_UNBLOCKED|ZFCP_STATUS_COMMON_OPEN,
 560                        ZFCP_CLEAR);
 561                 zfcp_erp_action_dismiss_adapter(adapter);
 562                 write_unlock_irqrestore(&adapter->erp_lock, flags);
 563                 zfcp_fsf_req_dismiss_all(adapter);
 564                 adapter->fsf_req_seq_no = 0;
 565                 zfcp_erp_adapter_reopen(adapter, 0);
 566         } else {
 567                 write_unlock_irqrestore(&adapter->erp_lock, flags);
 568                 zfcp_erp_adapter_reopen(adapter, 0);
 569                 zfcp_erp_wait(adapter);
 570         }
 571
 572         return SUCCESS;
 573 }
 574
 575 int
 576 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 577 {
 578         int retval = 0;
 579         static unsigned int unique_id = 0;
 580
 581         /* register adapter as SCSI host with mid layer of SCSI stack */
 582         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 583                                              sizeof (struct zfcp_adapter *));
 584         if (!adapter->scsi_host) {
 585                 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
 586                                 "for adapter %s ",
 587                                 zfcp_get_busid_by_adapter(adapter));
 588                 retval = -EIO;
 589                 goto out;
 590         }
 591         ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
 592
 593         /* tell the SCSI stack some characteristics of this adapter */
 594         adapter->scsi_host->max_id = 1;
 595         adapter->scsi_host->max_lun = 1;
 596         adapter->scsi_host->max_channel = 0;
 597         adapter->scsi_host->unique_id = unique_id++;    /* FIXME */
 598         adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
 599         adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
 600
 601         /*
 602          * save a pointer to our own adapter data structure within
 603          * hostdata field of SCSI host data structure
 604          */
 605         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 606
 607         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 608                 scsi_host_put(adapter->scsi_host);
 609                 retval = -EIO;
 610                 goto out;
 611         }
 612         atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 613  out:
 614         return retval;
 615 }
 616
 617 void
 618 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 619 {
 620         struct Scsi_Host *shost;
 621         struct zfcp_port *port;
 622
 623         shost = adapter->scsi_host;
 624         if (!shost)
 625                 return;
 626         read_lock_irq(&zfcp_data.config_lock);
 627         list_for_each_entry(port, &adapter->port_list_head, list)
 628                 if (port->rport)
 629                         port->rport = NULL;
 630         read_unlock_irq(&zfcp_data.config_lock);
 631         fc_remove_host(shost);
 632         scsi_remove_host(shost);
 633         scsi_host_put(shost);
 634         adapter->scsi_host = NULL;
 635         atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 636
 637         return;
 638 }
 639
 640 /*
 641  * Support functions for FC transport class
 642  */
 643 static struct fc_host_statistics*
 644 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
 645 {
 646         struct fc_host_statistics *fc_stats;
 647
 648         if (!adapter->fc_stats) {
 649                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 650                 if (!fc_stats)
 651                         return NULL;
 652                 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
 653         }
 654         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 655         return adapter->fc_stats;
 656 }
 657
 658 static void
 659 zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 660                           struct fsf_qtcb_bottom_port *data,
 661                           struct fsf_qtcb_bottom_port *old)
 662 {
 663         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset -
 664                 old->seconds_since_last_reset;
 665         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 666         fc_stats->tx_words = data->tx_words - old->tx_words;
 667         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 668         fc_stats->rx_words = data->rx_words - old->rx_words;
 669         fc_stats->lip_count = data->lip - old->lip;
 670         fc_stats->nos_count = data->nos - old->nos;
 671         fc_stats->error_frames = data->error_frames - old->error_frames;
 672         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 673         fc_stats->link_failure_count = data->link_failure - old->link_failure;
 674         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 675         fc_stats->loss_of_signal_count = data->loss_of_signal -
 676                 old->loss_of_signal;
 677         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts -
 678                 old->psp_error_counts;
 679         fc_stats->invalid_tx_word_count = data->invalid_tx_words -
 680                 old->invalid_tx_words;
 681         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 682         fc_stats->fcp_input_requests = data->input_requests -
 683                 old->input_requests;
 684         fc_stats->fcp_output_requests = data->output_requests -
 685                 old->output_requests;
 686         fc_stats->fcp_control_requests = data->control_requests -
 687                 old->control_requests;
 688         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 689         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 690 }
 691
 692 static void
 693 zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 694                        struct fsf_qtcb_bottom_port *data)
 695 {
 696         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 697         fc_stats->tx_frames = data->tx_frames;
 698         fc_stats->tx_words = data->tx_words;
 699         fc_stats->rx_frames = data->rx_frames;
 700         fc_stats->rx_words = data->rx_words;
 701         fc_stats->lip_count = data->lip;
 702         fc_stats->nos_count = data->nos;
 703         fc_stats->error_frames = data->error_frames;
 704         fc_stats->dumped_frames = data->dumped_frames;
 705         fc_stats->link_failure_count = data->link_failure;
 706         fc_stats->loss_of_sync_count = data->loss_of_sync;
 707         fc_stats->loss_of_signal_count = data->loss_of_signal;
 708         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 709         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 710         fc_stats->invalid_crc_count = data->invalid_crcs;
 711         fc_stats->fcp_input_requests = data->input_requests;
 712         fc_stats->fcp_output_requests = data->output_requests;
 713         fc_stats->fcp_control_requests = data->control_requests;
 714         fc_stats->fcp_input_megabytes = data->input_mb;
 715         fc_stats->fcp_output_megabytes = data->output_mb;
 716 }
 717
 718 /**
 719  * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc
 720  *
 721  * assumption: scsi_transport_fc synchronizes calls of
 722  *             get_fc_host_stats and reset_fc_host_stats
 723  *             (XXX to be checked otherwise introduce locking)
 724  */
 725 static struct fc_host_statistics *
 726 zfcp_get_fc_host_stats(struct Scsi_Host *shost)
 727 {
 728         struct zfcp_adapter *adapter;
 729         struct fc_host_statistics *fc_stats;
 730         struct fsf_qtcb_bottom_port *data;
 731         int ret;
 732
 733         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 734         fc_stats = zfcp_init_fc_host_stats(adapter);
 735         if (!fc_stats)
 736                 return NULL;
 737
 738         data = kzalloc(sizeof(*data), GFP_KERNEL);
 739         if (!data)
 740                 return NULL;
 741
 742         ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
 743         if (ret) {
 744                 kfree(data);
 745                 return NULL; /* XXX return zeroed fc_stats? */
 746         }
 747
 748         if (adapter->stats_reset &&
 749             ((jiffies/HZ - adapter->stats_reset) <
 750              data->seconds_since_last_reset)) {
 751                 zfcp_adjust_fc_host_stats(fc_stats, data,
 752                                           adapter->stats_reset_data);
 753         } else
 754                 zfcp_set_fc_host_stats(fc_stats, data);
 755
 756         kfree(data);
 757         return fc_stats;
 758 }
 759
 760 static void
 761 zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
 762 {
 763         struct zfcp_adapter *adapter;
 764         struct fsf_qtcb_bottom_port *data, *old_data;
 765         int ret;
 766
 767         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 768         data = kzalloc(sizeof(*data), GFP_KERNEL);
 769         if (!data)
 770                 return;
 771
 772         ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
 773         if (ret == 0) {
 774                 adapter->stats_reset = jiffies/HZ;
 775                 old_data = adapter->stats_reset_data;
 776                 adapter->stats_reset_data = data; /* finally freed in
 777                                                      adater_dequeue */
 778                 kfree(old_data);
 779         }
 780 }
 781
 782 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
 783 {
 784         rport->dev_loss_tmo = timeout;
 785 }
 786
 787 struct fc_function_template zfcp_transport_functions = {
 788         .show_starget_port_id = 1,
 789         .show_starget_port_name = 1,
 790         .show_starget_node_name = 1,
 791         .show_rport_supported_classes = 1,
 792         .show_rport_maxframe_size = 1,
 793         .show_rport_dev_loss_tmo = 1,
 794         .show_host_node_name = 1,
 795         .show_host_port_name = 1,
 796         .show_host_permanent_port_name = 1,
 797         .show_host_supported_classes = 1,
 798         .show_host_supported_speeds = 1,
 799         .show_host_maxframe_size = 1,
 800         .show_host_serial_number = 1,
 801         .get_fc_host_stats = zfcp_get_fc_host_stats,
 802         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
 803         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
 804         /* no functions registered for following dynamic attributes but
 805            directly set by LLDD */
 806         .show_host_port_type = 1,
 807         .show_host_speed = 1,
 808         .show_host_port_id = 1,
 809 };
 810
 811 /**
 812  * ZFCP_DEFINE_SCSI_ATTR
 813  * @_name:   name of show attribute
 814  * @_format: format string
 815  * @_value:  value to print
 816  *
 817  * Generates attribute for a unit.
 818  */
 819 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)                    \
 820 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr,        \
 821                                               char *buf)                 \
 822 {                                                                        \
 823         struct scsi_device *sdev;                                        \
 824         struct zfcp_unit *unit;                                          \
 825                                                                          \
 826         sdev = to_scsi_device(dev);                                      \
 827         unit = sdev->hostdata;                                           \
 828         return sprintf(buf, _format, _value);                            \
 829 }                                                                        \
 830                                                                          \
 831 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
 832
 833 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
 834 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
 835 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
 836
 837 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
 838         &dev_attr_fcp_lun,
 839         &dev_attr_wwpn,
 840         &dev_attr_hba_id,
 841         NULL
 842 };
 843
 844 #undef ZFCP_LOG_AREA