drivers/s390/scsi/zfcp_scsi.c

   1 /*
   2  *
   3  * linux/drivers/s390/scsi/zfcp_scsi.c
   4  *
   5  * FCP adapter driver for IBM eServer zSeries
   6  *
   7  * (C) Copyright IBM Corp. 2002, 2004
   8  *
   9  * Author(s): Martin Peschke <mpeschke@de.ibm.com>
  10  *            Raimund Schroeder <raimund.schroeder@de.ibm.com>
  11  *            Aron Zeh
  12  *            Wolfgang Taphorn
  13  *            Stefan Bader <stefan.bader@de.ibm.com>
  14  *            Heiko Carstens <heiko.carstens@de.ibm.com>
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2, or (at your option)
  19  * any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  29  */
  30
  31 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_SCSI
  32
  33 /* this drivers version (do not edit !!! generated and updated by cvs) */
  34 #define ZFCP_SCSI_REVISION "$Revision: 1.68 $"
  35
  36 #include "zfcp_ext.h"
  37
  38 static void zfcp_scsi_slave_destroy(struct scsi_device *sdp);
  39 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp);
  40 static int zfcp_scsi_slave_configure(struct scsi_device *sdp);
  41 static int zfcp_scsi_queuecommand(struct scsi_cmnd *,
  42                                   void (*done) (struct scsi_cmnd *));
  43 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *);
  44 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *);
  45 static int zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *);
  46 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *);
  47 static int zfcp_task_management_function(struct zfcp_unit *, u8);
  48
  49 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int, scsi_id_t,
  50                                           scsi_lun_t);
  51
  52 static struct device_attribute *zfcp_sysfs_sdev_attrs[];
  53
  54 struct scsi_transport_template *zfcp_transport_template;
  55
  56 struct zfcp_data zfcp_data = {
  57         .scsi_host_template = {
  58               name:                    ZFCP_NAME,
  59               proc_name:               "zfcp",
  60               proc_info:               NULL,
  61               detect:                  NULL,
  62               slave_alloc:             zfcp_scsi_slave_alloc,
  63               slave_configure:         zfcp_scsi_slave_configure,
  64               slave_destroy:           zfcp_scsi_slave_destroy,
  65               queuecommand:            zfcp_scsi_queuecommand,
  66               eh_abort_handler:        zfcp_scsi_eh_abort_handler,
  67               eh_device_reset_handler: zfcp_scsi_eh_device_reset_handler,
  68               eh_bus_reset_handler:    zfcp_scsi_eh_bus_reset_handler,
  69               eh_host_reset_handler:   zfcp_scsi_eh_host_reset_handler,
  70                                        /* FIXME(openfcp): Tune */
  71               can_queue:               4096,
  72               this_id:                 0,
  73               /*
  74                * FIXME:
  75                * one less? can zfcp_create_sbale cope with it?
  76                */
  77               sg_tablesize:            ZFCP_MAX_SBALES_PER_REQ,
  78               cmd_per_lun:             1,
  79               unchecked_isa_dma:       0,
  80               use_clustering:          1,
  81               sdev_attrs:              zfcp_sysfs_sdev_attrs,
  82         }
  83         /* rest initialised with zeros */
  84 };
  85
  86 /* Find start of Response Information in FCP response unit*/
  87 char *
  88 zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  89 {
  90         char *fcp_rsp_info_ptr;
  91
  92         fcp_rsp_info_ptr =
  93             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
  94
  95         return fcp_rsp_info_ptr;
  96 }
  97
  98 /* Find start of Sense Information in FCP response unit*/
  99 char *
 100 zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
 101 {
 102         char *fcp_sns_info_ptr;
 103
 104         fcp_sns_info_ptr =
 105             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
 106         if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
 107                 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr +
 108                     fcp_rsp_iu->fcp_rsp_len;
 109
 110         return fcp_sns_info_ptr;
 111 }
 112
 113 fcp_dl_t *
 114 zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd)
 115 {
 116         int additional_length = fcp_cmd->add_fcp_cdb_length << 2;
 117         fcp_dl_t *fcp_dl_addr;
 118
 119         fcp_dl_addr = (fcp_dl_t *)
 120                 ((unsigned char *) fcp_cmd +
 121                  sizeof (struct fcp_cmnd_iu) + additional_length);
 122         /*
 123          * fcp_dl_addr = start address of fcp_cmnd structure +
 124          * size of fixed part + size of dynamically sized add_dcp_cdb field
 125          * SEE FCP-2 documentation
 126          */
 127         return fcp_dl_addr;
 128 }
 129
 130 fcp_dl_t
 131 zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd)
 132 {
 133         return *zfcp_get_fcp_dl_ptr(fcp_cmd);
 134 }
 135
 136 void
 137 zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
 138 {
 139         *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl;
 140 }
 141
 142 /*
 143  * note: it's a bit-or operation not an assignment
 144  * regarding the specified byte
 145  */
 146 static inline void
 147 set_byte(u32 * result, char status, char pos)
 148 {
 149         *result |= status << (pos * 8);
 150 }
 151
 152 void
 153 set_host_byte(u32 * result, char status)
 154 {
 155         set_byte(result, status, 2);
 156 }
 157
 158 void
 159 set_driver_byte(u32 * result, char status)
 160 {
 161         set_byte(result, status, 3);
 162 }
 163
 164 /*
 165  * function:    zfcp_scsi_slave_alloc
 166  *
 167  * purpose:
 168  *
 169  * returns:
 170  */
 171
 172 static int
 173 zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 174 {
 175         struct zfcp_adapter *adapter;
 176         struct zfcp_unit *unit;
 177         unsigned long flags;
 178         int retval = -ENODEV;
 179
 180         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 181         if (!adapter)
 182                 goto out;
 183
 184         read_lock_irqsave(&zfcp_data.config_lock, flags);
 185         unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
 186         if (unit) {
 187                 sdp->hostdata = unit;
 188                 unit->device = sdp;
 189                 zfcp_unit_get(unit);
 190                 retval = 0;
 191         }
 192         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 193  out:
 194         return retval;
 195 }
 196
 197 /*
 198  * function:    zfcp_scsi_slave_destroy
 199  *
 200  * purpose:
 201  *
 202  * returns:
 203  */
 204
 205 static void
 206 zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
 207 {
 208         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
 209
 210         if (unit) {
 211                 sdpnt->hostdata = NULL;
 212                 unit->device = NULL;
 213                 zfcp_unit_put(unit);
 214         } else {
 215                 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at "
 216                                 "address %p\n", sdpnt);
 217         }
 218 }
 219
 220 /*
 221  * called from scsi midlayer to allow finetuning of a device.
 222  */
 223 static int
 224 zfcp_scsi_slave_configure(struct scsi_device *sdp)
 225 {
 226         if (sdp->tagged_supported)
 227                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN);
 228         else
 229                 scsi_adjust_queue_depth(sdp, 0, 1);
 230         return 0;
 231 }
 232
 233 /**
 234  * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function
 235  * @scpnt: pointer to struct scsi_cmnd where result is set
 236  * @result: result to be set in scpnt (e.g. DID_ERROR)
 237  */
 238 static void
 239 zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
 240 {
 241         set_host_byte(&scpnt->result, result);
 242         zfcp_cmd_dbf_event_scsi("failing", scpnt);
 243         /* return directly */
 244         scpnt->scsi_done(scpnt);
 245 }
 246
 247 /**
 248  * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and
 249  *      zfcp_scsi_command_sync
 250  * @adapter: adapter where scsi command is issued
 251  * @unit: unit to which scsi command is sent
 252  * @scpnt: scsi command to be sent
 253  * @timer: timer to be started if request is successfully initiated
 254  *
 255  * Note: In scsi_done function must be set in scpnt.
 256  */
 257 int
 258 zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit,
 259                         struct scsi_cmnd *scpnt, struct timer_list *timer)
 260 {
 261         int tmp;
 262         int retval;
 263
 264         retval = 0;
 265
 266         BUG_ON((adapter == NULL) || (adapter != unit->port->adapter));
 267         BUG_ON(scpnt->scsi_done == NULL);
 268
 269         if (unlikely(NULL == unit)) {
 270                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
 271                 goto out;
 272         }
 273
 274         if (unlikely(
 275               atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) ||
 276              !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) {
 277                 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port "
 278                                "0x%016Lx on adapter %s\n",
 279                                unit->fcp_lun, unit->port->wwpn,
 280                                zfcp_get_busid_by_adapter(adapter));
 281                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 282                 goto out;
 283         }
 284
 285         if (unlikely(
 286              !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) {
 287                 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx "
 288                                "on port 0x%016Lx in recovery\n",
 289                                zfcp_get_busid_by_unit(unit),
 290                                unit->fcp_lun, unit->port->wwpn);
 291                 retval = SCSI_MLQUEUE_DEVICE_BUSY;
 292                 goto out;
 293         }
 294
 295         tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, timer,
 296                                              ZFCP_REQ_AUTO_CLEANUP);
 297
 298         if (unlikely(tmp < 0)) {
 299                 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n");
 300                 retval = SCSI_MLQUEUE_HOST_BUSY;
 301         }
 302
 303 out:
 304         return retval;
 305 }
 306
 307 void
 308 zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt)
 309 {
 310         struct completion *wait = (struct completion *) scpnt->SCp.ptr;
 311         complete(wait);
 312 }
 313
 314
 315 /**
 316  * zfcp_scsi_command_sync - send a SCSI command and wait for completion
 317  * @unit: unit where command is sent to
 318  * @scpnt: scsi command to be sent
 319  * @timer: timer to be started if request is successfully initiated
 320  * Return: 0
 321  *
 322  * Errors are indicated in scpnt->result
 323  */
 324 int
 325 zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt,
 326                        struct timer_list *timer)
 327 {
 328         int ret;
 329         DECLARE_COMPLETION(wait);
 330
 331         scpnt->SCp.ptr = (void *) &wait;  /* silent re-use */
 332         scpnt->scsi_done = zfcp_scsi_command_sync_handler;
 333         ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, timer);
 334         if ((ret == 0) && (scpnt->result == 0))
 335         wait_for_completion(&wait);
 336
 337         scpnt->SCp.ptr = NULL;
 338
 339         return 0;
 340 }
 341
 342 /*
 343  * function:    zfcp_scsi_queuecommand
 344  *
 345  * purpose:     enqueues a SCSI command to the specified target device
 346  *
 347  * returns:     0 - success, SCSI command enqueued
 348  *              !0 - failure
 349  */
 350 int
 351 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
 352                        void (*done) (struct scsi_cmnd *))
 353 {
 354         struct zfcp_unit *unit;
 355         struct zfcp_adapter *adapter;
 356
 357         /* reset the status for this request */
 358         scpnt->result = 0;
 359         scpnt->host_scribble = NULL;
 360         scpnt->scsi_done = done;
 361
 362         /*
 363          * figure out adapter and target device
 364          * (stored there by zfcp_scsi_slave_alloc)
 365          */
 366         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
 367         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 368
 369         return zfcp_scsi_command_async(adapter, unit, scpnt, NULL);
 370 }
 371
 372 /*
 373  * function:    zfcp_unit_lookup
 374  *
 375  * purpose:
 376  *
 377  * returns:
 378  *
 379  * context:
 380  */
 381 static struct zfcp_unit *
 382 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id,
 383                  scsi_lun_t lun)
 384 {
 385         struct zfcp_port *port;
 386         struct zfcp_unit *unit, *retval = NULL;
 387
 388         list_for_each_entry(port, &adapter->port_list_head, list) {
 389                 if (id != port->scsi_id)
 390                         continue;
 391                 list_for_each_entry(unit, &port->unit_list_head, list) {
 392                         if (lun == unit->scsi_lun) {
 393                                 retval = unit;
 394                                 goto out;
 395                         }
 396                 }
 397         }
 398  out:
 399         return retval;
 400 }
 401
 402 /*
 403  * function:    zfcp_scsi_eh_abort_handler
 404  *
 405  * purpose:     tries to abort the specified (timed out) SCSI command
 406  *
 407  * note:        We do not need to care for a SCSI command which completes
 408  *              normally but late during this abort routine runs.
 409  *              We are allowed to return late commands to the SCSI stack.
 410  *              It tracks the state of commands and will handle late commands.
 411  *              (Usually, the normal completion of late commands is ignored with
 412  *              respect to the running abort operation. Grep for 'done_late'
 413  *              in the SCSI stacks sources.)
 414  *
 415  * returns:     SUCCESS - command has been aborted and cleaned up in internal
 416  *                        bookkeeping,
 417  *                        SCSI stack won't be called for aborted command
 418  *              FAILED  - otherwise
 419  */
 420 int
 421 zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 422 {
 423         int retval = SUCCESS;
 424         struct zfcp_fsf_req *new_fsf_req, *old_fsf_req;
 425         struct zfcp_adapter *adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
 426         struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
 427         struct zfcp_port *port = unit->port;
 428         struct Scsi_Host *scsi_host = scpnt->device->host;
 429         union zfcp_req_data *req_data = NULL;
 430         unsigned long flags;
 431         u32 status = 0;
 432
 433         /* the components of a abort_dbf record (fixed size record) */
 434         u64 dbf_scsi_cmnd = (unsigned long) scpnt;
 435         char dbf_opcode[ZFCP_ABORT_DBF_LENGTH];
 436         wwn_t dbf_wwn = port->wwpn;
 437         fcp_lun_t dbf_fcp_lun = unit->fcp_lun;
 438         u64 dbf_retries = scpnt->retries;
 439         u64 dbf_allowed = scpnt->allowed;
 440         u64 dbf_timeout = 0;
 441         u64 dbf_fsf_req = 0;
 442         u64 dbf_fsf_status = 0;
 443         u64 dbf_fsf_qual[2] = { 0, 0 };
 444         char dbf_result[ZFCP_ABORT_DBF_LENGTH] = "##undef";
 445
 446         memset(dbf_opcode, 0, ZFCP_ABORT_DBF_LENGTH);
 447         memcpy(dbf_opcode,
 448                scpnt->cmnd,
 449                min(scpnt->cmd_len, (unsigned char) ZFCP_ABORT_DBF_LENGTH));
 450
 451         ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
 452                       scpnt, zfcp_get_busid_by_adapter(adapter));
 453
 454         spin_unlock_irq(scsi_host->host_lock);
 455
 456         /*
 457          * Race condition between normal (late) completion and abort has
 458          * to be avoided.
 459          * The entirity of all accesses to scsi_req have to be atomic.
 460          * scsi_req is usually part of the fsf_req and thus we block the
 461          * release of fsf_req as long as we need to access scsi_req.
 462          */
 463         write_lock_irqsave(&adapter->abort_lock, flags);
 464
 465         /*
 466          * Check whether command has just completed and can not be aborted.
 467          * Even if the command has just been completed late, we can access
 468          * scpnt since the SCSI stack does not release it at least until
 469          * this routine returns. (scpnt is parameter passed to this routine
 470          * and must not disappear during abort even on late completion.)
 471          */
 472         req_data = (union zfcp_req_data *) scpnt->host_scribble;
 473         /* DEBUG */
 474         ZFCP_LOG_DEBUG("req_data=%p\n", req_data);
 475         if (!req_data) {
 476                 ZFCP_LOG_DEBUG("late command completion overtook abort\n");
 477                 /*
 478                  * That's it.
 479                  * Do not initiate abort but return SUCCESS.
 480                  */
 481                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 482                 retval = SUCCESS;
 483                 strncpy(dbf_result, "##late1", ZFCP_ABORT_DBF_LENGTH);
 484                 goto out;
 485         }
 486
 487         /* Figure out which fsf_req needs to be aborted. */
 488         old_fsf_req = req_data->send_fcp_command_task.fsf_req;
 489
 490         dbf_fsf_req = (unsigned long) old_fsf_req;
 491         dbf_timeout =
 492             (jiffies - req_data->send_fcp_command_task.start_jiffies) / HZ;
 493
 494         ZFCP_LOG_DEBUG("old_fsf_req=%p\n", old_fsf_req);
 495         if (!old_fsf_req) {
 496                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 497                 ZFCP_LOG_NORMAL("bug: no old fsf request found\n");
 498                 ZFCP_LOG_NORMAL("req_data:\n");
 499                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
 500                               (char *) req_data, sizeof (union zfcp_req_data));
 501                 ZFCP_LOG_NORMAL("scsi_cmnd:\n");
 502                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
 503                               (char *) scpnt, sizeof (struct scsi_cmnd));
 504                 retval = FAILED;
 505                 strncpy(dbf_result, "##bug:r", ZFCP_ABORT_DBF_LENGTH);
 506                 goto out;
 507         }
 508         old_fsf_req->data.send_fcp_command_task.scsi_cmnd = NULL;
 509         /* mark old request as being aborted */
 510         old_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
 511         /*
 512          * We have to collect all information (e.g. unit) needed by
 513          * zfcp_fsf_abort_fcp_command before calling that routine
 514          * since that routine is not allowed to access
 515          * fsf_req which it is going to abort.
 516          * This is because of we need to release fsf_req_list_lock
 517          * before calling zfcp_fsf_abort_fcp_command.
 518          * Since this lock will not be held, fsf_req may complete
 519          * late and may be released meanwhile.
 520          */
 521         ZFCP_LOG_DEBUG("unit 0x%016Lx (%p)\n", unit->fcp_lun, unit);
 522
 523         /*
 524          * We block (call schedule)
 525          * That's why we must release the lock and enable the
 526          * interrupts before.
 527          * On the other hand we do not need the lock anymore since
 528          * all critical accesses to scsi_req are done.
 529          */
 530         write_unlock_irqrestore(&adapter->abort_lock, flags);
 531         /* call FSF routine which does the abort */
 532         new_fsf_req = zfcp_fsf_abort_fcp_command((unsigned long) old_fsf_req,
 533                                                  adapter, unit, 0);
 534         ZFCP_LOG_DEBUG("new_fsf_req=%p\n", new_fsf_req);
 535         if (!new_fsf_req) {
 536                 retval = FAILED;
 537                 ZFCP_LOG_NORMAL("error: initiation of Abort FCP Cmnd "
 538                                 "failed\n");
 539                 strncpy(dbf_result, "##nores", ZFCP_ABORT_DBF_LENGTH);
 540                 goto out;
 541         }
 542
 543         /* wait for completion of abort */
 544         ZFCP_LOG_DEBUG("waiting for cleanup...\n");
 545 #if 1
 546         /*
 547          * FIXME:
 548          * copying zfcp_fsf_req_wait_and_cleanup code is not really nice
 549          */
 550         __wait_event(new_fsf_req->completion_wq,
 551                      new_fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 552         status = new_fsf_req->status;
 553         dbf_fsf_status = new_fsf_req->qtcb->header.fsf_status;
 554         /*
 555          * Ralphs special debug load provides timestamps in the FSF
 556          * status qualifier. This might be specified later if being
 557          * useful for debugging aborts.
 558          */
 559         dbf_fsf_qual[0] =
 560             *(u64 *) & new_fsf_req->qtcb->header.fsf_status_qual.word[0];
 561         dbf_fsf_qual[1] =
 562             *(u64 *) & new_fsf_req->qtcb->header.fsf_status_qual.word[2];
 563         zfcp_fsf_req_cleanup(new_fsf_req);
 564 #else
 565         retval = zfcp_fsf_req_wait_and_cleanup(new_fsf_req,
 566                                                ZFCP_UNINTERRUPTIBLE, &status);
 567 #endif
 568         ZFCP_LOG_DEBUG("Waiting for cleanup complete, status=0x%x\n", status);
 569         /* status should be valid since signals were not permitted */
 570         if (status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
 571                 retval = SUCCESS;
 572                 strncpy(dbf_result, "##succ", ZFCP_ABORT_DBF_LENGTH);
 573         } else if (status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
 574                 retval = SUCCESS;
 575                 strncpy(dbf_result, "##late2", ZFCP_ABORT_DBF_LENGTH);
 576         } else {
 577                 retval = FAILED;
 578                 strncpy(dbf_result, "##fail", ZFCP_ABORT_DBF_LENGTH);
 579         }
 580
 581  out:
 582         debug_event(adapter->abort_dbf, 1, &dbf_scsi_cmnd, sizeof (u64));
 583         debug_event(adapter->abort_dbf, 1, &dbf_opcode, ZFCP_ABORT_DBF_LENGTH);
 584         debug_event(adapter->abort_dbf, 1, &dbf_wwn, sizeof (wwn_t));
 585         debug_event(adapter->abort_dbf, 1, &dbf_fcp_lun, sizeof (fcp_lun_t));
 586         debug_event(adapter->abort_dbf, 1, &dbf_retries, sizeof (u64));
 587         debug_event(adapter->abort_dbf, 1, &dbf_allowed, sizeof (u64));
 588         debug_event(adapter->abort_dbf, 1, &dbf_timeout, sizeof (u64));
 589         debug_event(adapter->abort_dbf, 1, &dbf_fsf_req, sizeof (u64));
 590         debug_event(adapter->abort_dbf, 1, &dbf_fsf_status, sizeof (u64));
 591         debug_event(adapter->abort_dbf, 1, &dbf_fsf_qual[0], sizeof (u64));
 592         debug_event(adapter->abort_dbf, 1, &dbf_fsf_qual[1], sizeof (u64));
 593         debug_text_event(adapter->abort_dbf, 1, dbf_result);
 594
 595         spin_lock_irq(scsi_host->host_lock);
 596         return retval;
 597 }
 598
 599 /*
 600  * function:    zfcp_scsi_eh_device_reset_handler
 601  *
 602  * purpose:
 603  *
 604  * returns:
 605  */
 606 int
 607 zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 608 {
 609         int retval;
 610         struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
 611         struct Scsi_Host *scsi_host = scpnt->device->host;
 612
 613         spin_unlock_irq(scsi_host->host_lock);
 614
 615         if (!unit) {
 616                 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
 617                 retval = SUCCESS;
 618                 goto out;
 619         }
 620         ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun);
 621
 622         /*
 623          * If we do not know whether the unit supports 'logical unit reset'
 624          * then try 'logical unit reset' and proceed with 'target reset'
 625          * if 'logical unit reset' fails.
 626          * If the unit is known not to support 'logical unit reset' then
 627          * skip 'logical unit reset' and try 'target reset' immediately.
 628          */
 629         if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 630                               &unit->status)) {
 631                 retval =
 632                     zfcp_task_management_function(unit, LOGICAL_UNIT_RESET);
 633                 if (retval) {
 634                         ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit);
 635                         if (retval == -ENOTSUPP)
 636                                 atomic_set_mask
 637                                     (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 638                                      &unit->status);
 639                         /* fall through and try 'target reset' next */
 640                 } else {
 641                         ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n",
 642                                        unit);
 643                         /* avoid 'target reset' */
 644                         retval = SUCCESS;
 645                         goto out;
 646                 }
 647         }
 648         retval = zfcp_task_management_function(unit, TARGET_RESET);
 649         if (retval) {
 650                 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit);
 651                 retval = FAILED;
 652         } else {
 653                 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit);
 654                 retval = SUCCESS;
 655         }
 656  out:
 657         spin_lock_irq(scsi_host->host_lock);
 658         return retval;
 659 }
 660
 661 static int
 662 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags)
 663 {
 664         struct zfcp_adapter *adapter = unit->port->adapter;
 665         int retval;
 666         int status;
 667         struct zfcp_fsf_req *fsf_req;
 668
 669         /* issue task management function */
 670         fsf_req = zfcp_fsf_send_fcp_command_task_management
 671                 (adapter, unit, tm_flags, 0);
 672         if (!fsf_req) {
 673                 ZFCP_LOG_INFO("error: creation of task management request "
 674                               "failed for unit 0x%016Lx on port 0x%016Lx on  "
 675                               "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
 676                               zfcp_get_busid_by_adapter(adapter));
 677                 retval = -ENOMEM;
 678                 goto out;
 679         }
 680
 681         retval = zfcp_fsf_req_wait_and_cleanup(fsf_req,
 682                                                ZFCP_UNINTERRUPTIBLE, &status);
 683         /*
 684          * check completion status of task management function
 685          * (status should always be valid since no signals permitted)
 686          */
 687         if (status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED)
 688                 retval = -EIO;
 689         else if (status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP)
 690                 retval = -ENOTSUPP;
 691         else
 692                 retval = 0;
 693  out:
 694         return retval;
 695 }
 696
 697 /*
 698  * function:    zfcp_scsi_eh_bus_reset_handler
 699  *
 700  * purpose:
 701  *
 702  * returns:
 703  */
 704 int
 705 zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *scpnt)
 706 {
 707         int retval = 0;
 708         struct zfcp_unit *unit;
 709         struct Scsi_Host *scsi_host = scpnt->device->host;
 710
 711         spin_unlock_irq(scsi_host->host_lock);
 712
 713         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 714         ZFCP_LOG_NORMAL("bus reset because of problems with "
 715                         "unit 0x%016Lx\n", unit->fcp_lun);
 716         zfcp_erp_adapter_reopen(unit->port->adapter, 0);
 717         zfcp_erp_wait(unit->port->adapter);
 718         retval = SUCCESS;
 719
 720         spin_lock_irq(scsi_host->host_lock);
 721         return retval;
 722 }
 723
 724 /*
 725  * function:    zfcp_scsi_eh_host_reset_handler
 726  *
 727  * purpose:
 728  *
 729  * returns:
 730  */
 731 int
 732 zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 733 {
 734         int retval = 0;
 735         struct zfcp_unit *unit;
 736         struct Scsi_Host *scsi_host = scpnt->device->host;
 737
 738         spin_unlock_irq(scsi_host->host_lock);
 739
 740         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 741         ZFCP_LOG_NORMAL("host reset because of problems with "
 742                         "unit 0x%016Lx\n", unit->fcp_lun);
 743         zfcp_erp_adapter_reopen(unit->port->adapter, 0);
 744         zfcp_erp_wait(unit->port->adapter);
 745         retval = SUCCESS;
 746
 747         spin_lock_irq(scsi_host->host_lock);
 748         return retval;
 749 }
 750
 751 /*
 752  * function:
 753  *
 754  * purpose:
 755  *
 756  * returns:
 757  */
 758 int
 759 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 760 {
 761         int retval = 0;
 762         static unsigned int unique_id = 0;
 763
 764         /* register adapter as SCSI host with mid layer of SCSI stack */
 765         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 766                                              sizeof (struct zfcp_adapter *));
 767         if (!adapter->scsi_host) {
 768                 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
 769                                 "for adapter %s ",
 770                                 zfcp_get_busid_by_adapter(adapter));
 771                 retval = -EIO;
 772                 goto out;
 773         }
 774         ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
 775
 776         /* tell the SCSI stack some characteristics of this adapter */
 777         adapter->scsi_host->max_id = 1;
 778         adapter->scsi_host->max_lun = 1;
 779         adapter->scsi_host->max_channel = 0;
 780         adapter->scsi_host->unique_id = unique_id++;    /* FIXME */
 781         adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
 782         adapter->scsi_host->transportt = zfcp_transport_template;
 783         /*
 784          * Reverse mapping of the host number to avoid race condition
 785          */
 786         adapter->scsi_host_no = adapter->scsi_host->host_no;
 787
 788         /*
 789          * save a pointer to our own adapter data structure within
 790          * hostdata field of SCSI host data structure
 791          */
 792         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 793
 794         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 795                 scsi_host_put(adapter->scsi_host);
 796                 retval = -EIO;
 797                 goto out;
 798         }
 799         atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 800  out:
 801         return retval;
 802 }
 803
 804 /*
 805  * function:
 806  *
 807  * purpose:
 808  *
 809  * returns:
 810  */
 811 void
 812 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 813 {
 814         struct Scsi_Host *shost;
 815
 816         shost = adapter->scsi_host;
 817         if (!shost)
 818                 return;
 819         scsi_remove_host(shost);
 820         scsi_host_put(shost);
 821         adapter->scsi_host = NULL;
 822         adapter->scsi_host_no = 0;
 823         atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 824
 825         return;
 826 }
 827
 828
 829 void
 830 zfcp_fsf_start_scsi_er_timer(struct zfcp_adapter *adapter)
 831 {
 832         adapter->scsi_er_timer.function = zfcp_fsf_scsi_er_timeout_handler;
 833         adapter->scsi_er_timer.data = (unsigned long) adapter;
 834         adapter->scsi_er_timer.expires = jiffies + ZFCP_SCSI_ER_TIMEOUT;
 835         add_timer(&adapter->scsi_er_timer);
 836 }
 837
 838 /*
 839  * Support functions for FC transport class
 840  */
 841 static void
 842 zfcp_get_port_id(struct scsi_device *sdev)
 843 {
 844         struct zfcp_unit *unit;
 845
 846         unit = (struct zfcp_unit *) sdev->hostdata;
 847         fc_port_id(sdev) = unit->port->d_id;
 848 }
 849
 850 static void
 851 zfcp_get_port_name(struct scsi_device *sdev)
 852 {
 853         struct zfcp_unit *unit;
 854
 855         unit = (struct zfcp_unit *) sdev->hostdata;
 856         fc_port_name(sdev) = unit->port->wwpn;
 857 }
 858
 859 static void
 860 zfcp_get_node_name(struct scsi_device *sdev)
 861 {
 862         struct zfcp_unit *unit;
 863
 864         unit = (struct zfcp_unit *) sdev->hostdata;
 865         fc_node_name(sdev) = unit->port->wwnn;
 866 }
 867
 868 struct fc_function_template zfcp_transport_functions = {
 869         .get_port_id = zfcp_get_port_id,
 870         .get_port_name = zfcp_get_port_name,
 871         .get_node_name = zfcp_get_node_name,
 872         .show_port_id = 1,
 873         .show_port_name = 1,
 874         .show_node_name = 1,
 875 };
 876
 877 /**
 878  * ZFCP_DEFINE_SCSI_ATTR
 879  * @_name:   name of show attribute
 880  * @_format: format string
 881  * @_value:  value to print
 882  *
 883  * Generates attribute for a unit.
 884  */
 885 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)                    \
 886 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev,        \
 887                                               char *buf)                 \
 888 {                                                                        \
 889         struct scsi_device *sdev;                                        \
 890         struct zfcp_unit *unit;                                          \
 891                                                                          \
 892         sdev = to_scsi_device(dev);                                      \
 893         unit = sdev->hostdata;                                           \
 894         return sprintf(buf, _format, _value);                            \
 895 }                                                                        \
 896                                                                          \
 897 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
 898
 899 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
 900 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
 901 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
 902
 903 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
 904         &dev_attr_fcp_lun,
 905         &dev_attr_wwpn,
 906         &dev_attr_hba_id,
 907         NULL
 908 };
 909
 910 #undef ZFCP_LOG_AREA