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 static struct zfcp_port * zfcp_port_lookup(struct zfcp_adapter *, int,
  52                                          scsi_id_t);
  53
  54 static struct device_attribute *zfcp_sysfs_sdev_attrs[];
  55
  56 struct scsi_transport_template *zfcp_transport_template;
  57
  58 struct zfcp_data zfcp_data = {
  59         .scsi_host_template = {
  60               name:                    ZFCP_NAME,
  61               proc_name:               "zfcp",
  62               proc_info:               NULL,
  63               detect:                  NULL,
  64               slave_alloc:             zfcp_scsi_slave_alloc,
  65               slave_configure:         zfcp_scsi_slave_configure,
  66               slave_destroy:           zfcp_scsi_slave_destroy,
  67               queuecommand:            zfcp_scsi_queuecommand,
  68               eh_abort_handler:        zfcp_scsi_eh_abort_handler,
  69               eh_device_reset_handler: zfcp_scsi_eh_device_reset_handler,
  70               eh_bus_reset_handler:    zfcp_scsi_eh_bus_reset_handler,
  71               eh_host_reset_handler:   zfcp_scsi_eh_host_reset_handler,
  72                                        /* FIXME(openfcp): Tune */
  73               can_queue:               4096,
  74               this_id:                 0,
  75               /*
  76                * FIXME:
  77                * one less? can zfcp_create_sbale cope with it?
  78                */
  79               sg_tablesize:            ZFCP_MAX_SBALES_PER_REQ,
  80               cmd_per_lun:             1,
  81               unchecked_isa_dma:       0,
  82               use_clustering:          1,
  83               sdev_attrs:              zfcp_sysfs_sdev_attrs,
  84         }
  85         /* rest initialised with zeros */
  86 };
  87
  88 /* Find start of Response Information in FCP response unit*/
  89 char *
  90 zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
  91 {
  92         char *fcp_rsp_info_ptr;
  93
  94         fcp_rsp_info_ptr =
  95             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
  96
  97         return fcp_rsp_info_ptr;
  98 }
  99
 100 /* Find start of Sense Information in FCP response unit*/
 101 char *
 102 zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
 103 {
 104         char *fcp_sns_info_ptr;
 105
 106         fcp_sns_info_ptr =
 107             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
 108         if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
 109                 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr +
 110                     fcp_rsp_iu->fcp_rsp_len;
 111
 112         return fcp_sns_info_ptr;
 113 }
 114
 115 fcp_dl_t *
 116 zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd)
 117 {
 118         int additional_length = fcp_cmd->add_fcp_cdb_length << 2;
 119         fcp_dl_t *fcp_dl_addr;
 120
 121         fcp_dl_addr = (fcp_dl_t *)
 122                 ((unsigned char *) fcp_cmd +
 123                  sizeof (struct fcp_cmnd_iu) + additional_length);
 124         /*
 125          * fcp_dl_addr = start address of fcp_cmnd structure +
 126          * size of fixed part + size of dynamically sized add_dcp_cdb field
 127          * SEE FCP-2 documentation
 128          */
 129         return fcp_dl_addr;
 130 }
 131
 132 fcp_dl_t
 133 zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd)
 134 {
 135         return *zfcp_get_fcp_dl_ptr(fcp_cmd);
 136 }
 137
 138 void
 139 zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
 140 {
 141         *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl;
 142 }
 143
 144 /*
 145  * note: it's a bit-or operation not an assignment
 146  * regarding the specified byte
 147  */
 148 static inline void
 149 set_byte(u32 * result, char status, char pos)
 150 {
 151         *result |= status << (pos * 8);
 152 }
 153
 154 void
 155 set_host_byte(u32 * result, char status)
 156 {
 157         set_byte(result, status, 2);
 158 }
 159
 160 void
 161 set_driver_byte(u32 * result, char status)
 162 {
 163         set_byte(result, status, 3);
 164 }
 165
 166 /*
 167  * function:    zfcp_scsi_slave_alloc
 168  *
 169  * purpose:
 170  *
 171  * returns:
 172  */
 173
 174 static int
 175 zfcp_scsi_slave_alloc(struct scsi_device *sdp)
 176 {
 177         struct zfcp_adapter *adapter;
 178         struct zfcp_unit *unit;
 179         unsigned long flags;
 180         int retval = -ENODEV;
 181
 182         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
 183         if (!adapter)
 184                 goto out;
 185
 186         read_lock_irqsave(&zfcp_data.config_lock, flags);
 187         unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
 188         if (unit) {
 189                 sdp->hostdata = unit;
 190                 unit->device = sdp;
 191                 zfcp_unit_get(unit);
 192                 retval = 0;
 193         }
 194         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 195  out:
 196         return retval;
 197 }
 198
 199 /*
 200  * function:    zfcp_scsi_slave_destroy
 201  *
 202  * purpose:
 203  *
 204  * returns:
 205  */
 206
 207 static void
 208 zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
 209 {
 210         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
 211
 212         if (unit) {
 213                 sdpnt->hostdata = NULL;
 214                 unit->device = NULL;
 215                 zfcp_unit_put(unit);
 216         } else {
 217                 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at "
 218                                 "address %p\n", sdpnt);
 219         }
 220 }
 221
 222 /*
 223  * called from scsi midlayer to allow finetuning of a device.
 224  */
 225 static int
 226 zfcp_scsi_slave_configure(struct scsi_device *sdp)
 227 {
 228         if (sdp->tagged_supported)
 229                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN);
 230         else
 231                 scsi_adjust_queue_depth(sdp, 0, 1);
 232         return 0;
 233 }
 234
 235 /**
 236  * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function
 237  * @scpnt: pointer to struct scsi_cmnd where result is set
 238  * @result: result to be set in scpnt (e.g. DID_ERROR)
 239  */
 240 static void
 241 zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
 242 {
 243         set_host_byte(&scpnt->result, result);
 244         zfcp_cmd_dbf_event_scsi("failing", scpnt);
 245         /* return directly */
 246         scpnt->scsi_done(scpnt);
 247 }
 248
 249 /**
 250  * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and
 251  *      zfcp_scsi_command_sync
 252  * @adapter: adapter where scsi command is issued
 253  * @unit: unit to which scsi command is sent
 254  * @scpnt: scsi command to be sent
 255  * @timer: timer to be started if request is successfully initiated
 256  *
 257  * Note: In scsi_done function must be set in scpnt.
 258  */
 259 int
 260 zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit,
 261                         struct scsi_cmnd *scpnt, struct timer_list *timer)
 262 {
 263         int tmp;
 264         int retval;
 265
 266         retval = 0;
 267
 268         BUG_ON((adapter == NULL) || (adapter != unit->port->adapter));
 269         BUG_ON(scpnt->scsi_done == NULL);
 270
 271         if (unlikely(NULL == unit)) {
 272                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
 273                 goto out;
 274         }
 275
 276         if (unlikely(
 277               atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) ||
 278              !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) {
 279                 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port "
 280                                "0x%016Lx on adapter %s\n",
 281                                unit->fcp_lun, unit->port->wwpn,
 282                                zfcp_get_busid_by_adapter(adapter));
 283                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
 284                 goto out;
 285         }
 286
 287         if (unlikely(
 288              !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) {
 289                 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx "
 290                                "on port 0x%016Lx in recovery\n",
 291                                zfcp_get_busid_by_unit(unit),
 292                                unit->fcp_lun, unit->port->wwpn);
 293                 retval = SCSI_MLQUEUE_DEVICE_BUSY;
 294                 goto out;
 295         }
 296
 297         tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, timer,
 298                                              ZFCP_REQ_AUTO_CLEANUP);
 299
 300         if (unlikely(tmp < 0)) {
 301                 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n");
 302                 retval = SCSI_MLQUEUE_HOST_BUSY;
 303         }
 304
 305 out:
 306         return retval;
 307 }
 308
 309 void
 310 zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt)
 311 {
 312         struct completion *wait = (struct completion *) scpnt->SCp.ptr;
 313         complete(wait);
 314 }
 315
 316
 317 /**
 318  * zfcp_scsi_command_sync - send a SCSI command and wait for completion
 319  * @unit: unit where command is sent to
 320  * @scpnt: scsi command to be sent
 321  * @timer: timer to be started if request is successfully initiated
 322  * Return: 0
 323  *
 324  * Errors are indicated in scpnt->result
 325  */
 326 int
 327 zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt,
 328                        struct timer_list *timer)
 329 {
 330         int ret;
 331         DECLARE_COMPLETION(wait);
 332
 333         scpnt->SCp.ptr = (void *) &wait;  /* silent re-use */
 334         scpnt->scsi_done = zfcp_scsi_command_sync_handler;
 335         ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, timer);
 336         if ((ret == 0) && (scpnt->result == 0))
 337         wait_for_completion(&wait);
 338
 339         scpnt->SCp.ptr = NULL;
 340
 341         return 0;
 342 }
 343
 344 /*
 345  * function:    zfcp_scsi_queuecommand
 346  *
 347  * purpose:     enqueues a SCSI command to the specified target device
 348  *
 349  * returns:     0 - success, SCSI command enqueued
 350  *              !0 - failure
 351  */
 352 int
 353 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
 354                        void (*done) (struct scsi_cmnd *))
 355 {
 356         struct zfcp_unit *unit;
 357         struct zfcp_adapter *adapter;
 358
 359         /* reset the status for this request */
 360         scpnt->result = 0;
 361         scpnt->host_scribble = NULL;
 362         scpnt->scsi_done = done;
 363
 364         /*
 365          * figure out adapter and target device
 366          * (stored there by zfcp_scsi_slave_alloc)
 367          */
 368         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
 369         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 370
 371         return zfcp_scsi_command_async(adapter, unit, scpnt, NULL);
 372 }
 373
 374 /*
 375  * function:    zfcp_unit_lookup
 376  *
 377  * purpose:
 378  *
 379  * returns:
 380  *
 381  * context:
 382  */
 383 static struct zfcp_unit *
 384 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id,
 385                  scsi_lun_t lun)
 386 {
 387         struct zfcp_port *port;
 388         struct zfcp_unit *unit, *retval = NULL;
 389
 390         list_for_each_entry(port, &adapter->port_list_head, list) {
 391                 if (id != port->scsi_id)
 392                         continue;
 393                 list_for_each_entry(unit, &port->unit_list_head, list) {
 394                         if (lun == unit->scsi_lun) {
 395                                 retval = unit;
 396                                 goto out;
 397                         }
 398                 }
 399         }
 400  out:
 401         return retval;
 402 }
 403 /*
 404  * function:    zfcp_unit_tgt_lookup
 405  *
 406  * purpose:
 407  *
 408  * returns:
 409  *
 410  * context:
 411  */
 412 static struct zfcp_port *
 413 zfcp_port_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id)
 414 {
 415         struct zfcp_port *port;
 416
 417         list_for_each_entry(port, &adapter->port_list_head, list) {
 418                 if (id == port->scsi_id)
 419                         return port;
 420         }
 421         return (struct zfcp_port *)NULL;
 422 }
 423
 424 /*
 425  * function:    zfcp_scsi_eh_abort_handler
 426  *
 427  * purpose:     tries to abort the specified (timed out) SCSI command
 428  *
 429  * note:        We do not need to care for a SCSI command which completes
 430  *              normally but late during this abort routine runs.
 431  *              We are allowed to return late commands to the SCSI stack.
 432  *              It tracks the state of commands and will handle late commands.
 433  *              (Usually, the normal completion of late commands is ignored with
 434  *              respect to the running abort operation. Grep for 'done_late'
 435  *              in the SCSI stacks sources.)
 436  *
 437  * returns:     SUCCESS - command has been aborted and cleaned up in internal
 438  *                        bookkeeping,
 439  *                        SCSI stack won't be called for aborted command
 440  *              FAILED  - otherwise
 441  */
 442 int
 443 zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 444 {
 445         int retval = SUCCESS;
 446         struct zfcp_fsf_req *new_fsf_req, *old_fsf_req;
 447         struct zfcp_adapter *adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
 448         struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
 449         struct zfcp_port *port = unit->port;
 450         struct Scsi_Host *scsi_host = scpnt->device->host;
 451         union zfcp_req_data *req_data = NULL;
 452         unsigned long flags;
 453         u32 status = 0;
 454
 455         /* the components of a abort_dbf record (fixed size record) */
 456         u64 dbf_scsi_cmnd = (unsigned long) scpnt;
 457         char dbf_opcode[ZFCP_ABORT_DBF_LENGTH];
 458         wwn_t dbf_wwn = port->wwpn;
 459         fcp_lun_t dbf_fcp_lun = unit->fcp_lun;
 460         u64 dbf_retries = scpnt->retries;
 461         u64 dbf_allowed = scpnt->allowed;
 462         u64 dbf_timeout = 0;
 463         u64 dbf_fsf_req = 0;
 464         u64 dbf_fsf_status = 0;
 465         u64 dbf_fsf_qual[2] = { 0, 0 };
 466         char dbf_result[ZFCP_ABORT_DBF_LENGTH] = "##undef";
 467
 468         memset(dbf_opcode, 0, ZFCP_ABORT_DBF_LENGTH);
 469         memcpy(dbf_opcode,
 470                scpnt->cmnd,
 471                min(scpnt->cmd_len, (unsigned char) ZFCP_ABORT_DBF_LENGTH));
 472
 473         ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
 474                       scpnt, zfcp_get_busid_by_adapter(adapter));
 475
 476         spin_unlock_irq(scsi_host->host_lock);
 477
 478         /*
 479          * Race condition between normal (late) completion and abort has
 480          * to be avoided.
 481          * The entirity of all accesses to scsi_req have to be atomic.
 482          * scsi_req is usually part of the fsf_req and thus we block the
 483          * release of fsf_req as long as we need to access scsi_req.
 484          */
 485         write_lock_irqsave(&adapter->abort_lock, flags);
 486
 487         /*
 488          * Check whether command has just completed and can not be aborted.
 489          * Even if the command has just been completed late, we can access
 490          * scpnt since the SCSI stack does not release it at least until
 491          * this routine returns. (scpnt is parameter passed to this routine
 492          * and must not disappear during abort even on late completion.)
 493          */
 494         req_data = (union zfcp_req_data *) scpnt->host_scribble;
 495         /* DEBUG */
 496         ZFCP_LOG_DEBUG("req_data=%p\n", req_data);
 497         if (!req_data) {
 498                 ZFCP_LOG_DEBUG("late command completion overtook abort\n");
 499                 /*
 500                  * That's it.
 501                  * Do not initiate abort but return SUCCESS.
 502                  */
 503                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 504                 retval = SUCCESS;
 505                 strncpy(dbf_result, "##late1", ZFCP_ABORT_DBF_LENGTH);
 506                 goto out;
 507         }
 508
 509         /* Figure out which fsf_req needs to be aborted. */
 510         old_fsf_req = req_data->send_fcp_command_task.fsf_req;
 511
 512         dbf_fsf_req = (unsigned long) old_fsf_req;
 513         dbf_timeout =
 514             (jiffies - req_data->send_fcp_command_task.start_jiffies) / HZ;
 515
 516         ZFCP_LOG_DEBUG("old_fsf_req=%p\n", old_fsf_req);
 517         if (!old_fsf_req) {
 518                 write_unlock_irqrestore(&adapter->abort_lock, flags);
 519                 ZFCP_LOG_NORMAL("bug: no old fsf request found\n");
 520                 ZFCP_LOG_NORMAL("req_data:\n");
 521                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
 522                               (char *) req_data, sizeof (union zfcp_req_data));
 523                 ZFCP_LOG_NORMAL("scsi_cmnd:\n");
 524                 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
 525                               (char *) scpnt, sizeof (struct scsi_cmnd));
 526                 retval = FAILED;
 527                 strncpy(dbf_result, "##bug:r", ZFCP_ABORT_DBF_LENGTH);
 528                 goto out;
 529         }
 530         old_fsf_req->data.send_fcp_command_task.scsi_cmnd = NULL;
 531         /* mark old request as being aborted */
 532         old_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
 533         /*
 534          * We have to collect all information (e.g. unit) needed by
 535          * zfcp_fsf_abort_fcp_command before calling that routine
 536          * since that routine is not allowed to access
 537          * fsf_req which it is going to abort.
 538          * This is because of we need to release fsf_req_list_lock
 539          * before calling zfcp_fsf_abort_fcp_command.
 540          * Since this lock will not be held, fsf_req may complete
 541          * late and may be released meanwhile.
 542          */
 543         ZFCP_LOG_DEBUG("unit 0x%016Lx (%p)\n", unit->fcp_lun, unit);
 544
 545         /*
 546          * We block (call schedule)
 547          * That's why we must release the lock and enable the
 548          * interrupts before.
 549          * On the other hand we do not need the lock anymore since
 550          * all critical accesses to scsi_req are done.
 551          */
 552         write_unlock_irqrestore(&adapter->abort_lock, flags);
 553         /* call FSF routine which does the abort */
 554         new_fsf_req = zfcp_fsf_abort_fcp_command((unsigned long) old_fsf_req,
 555                                                  adapter, unit, 0);
 556         ZFCP_LOG_DEBUG("new_fsf_req=%p\n", new_fsf_req);
 557         if (!new_fsf_req) {
 558                 retval = FAILED;
 559                 ZFCP_LOG_NORMAL("error: initiation of Abort FCP Cmnd "
 560                                 "failed\n");
 561                 strncpy(dbf_result, "##nores", ZFCP_ABORT_DBF_LENGTH);
 562                 goto out;
 563         }
 564
 565         /* wait for completion of abort */
 566         ZFCP_LOG_DEBUG("waiting for cleanup...\n");
 567 #if 1
 568         /*
 569          * FIXME:
 570          * copying zfcp_fsf_req_wait_and_cleanup code is not really nice
 571          */
 572         __wait_event(new_fsf_req->completion_wq,
 573                      new_fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
 574         status = new_fsf_req->status;
 575         dbf_fsf_status = new_fsf_req->qtcb->header.fsf_status;
 576         /*
 577          * Ralphs special debug load provides timestamps in the FSF
 578          * status qualifier. This might be specified later if being
 579          * useful for debugging aborts.
 580          */
 581         dbf_fsf_qual[0] =
 582             *(u64 *) & new_fsf_req->qtcb->header.fsf_status_qual.word[0];
 583         dbf_fsf_qual[1] =
 584             *(u64 *) & new_fsf_req->qtcb->header.fsf_status_qual.word[2];
 585         zfcp_fsf_req_cleanup(new_fsf_req);
 586 #else
 587         retval = zfcp_fsf_req_wait_and_cleanup(new_fsf_req,
 588                                                ZFCP_UNINTERRUPTIBLE, &status);
 589 #endif
 590         ZFCP_LOG_DEBUG("Waiting for cleanup complete, status=0x%x\n", status);
 591         /* status should be valid since signals were not permitted */
 592         if (status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
 593                 retval = SUCCESS;
 594                 strncpy(dbf_result, "##succ", ZFCP_ABORT_DBF_LENGTH);
 595         } else if (status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
 596                 retval = SUCCESS;
 597                 strncpy(dbf_result, "##late2", ZFCP_ABORT_DBF_LENGTH);
 598         } else {
 599                 retval = FAILED;
 600                 strncpy(dbf_result, "##fail", ZFCP_ABORT_DBF_LENGTH);
 601         }
 602
 603  out:
 604         debug_event(adapter->abort_dbf, 1, &dbf_scsi_cmnd, sizeof (u64));
 605         debug_event(adapter->abort_dbf, 1, &dbf_opcode, ZFCP_ABORT_DBF_LENGTH);
 606         debug_event(adapter->abort_dbf, 1, &dbf_wwn, sizeof (wwn_t));
 607         debug_event(adapter->abort_dbf, 1, &dbf_fcp_lun, sizeof (fcp_lun_t));
 608         debug_event(adapter->abort_dbf, 1, &dbf_retries, sizeof (u64));
 609         debug_event(adapter->abort_dbf, 1, &dbf_allowed, sizeof (u64));
 610         debug_event(adapter->abort_dbf, 1, &dbf_timeout, sizeof (u64));
 611         debug_event(adapter->abort_dbf, 1, &dbf_fsf_req, sizeof (u64));
 612         debug_event(adapter->abort_dbf, 1, &dbf_fsf_status, sizeof (u64));
 613         debug_event(adapter->abort_dbf, 1, &dbf_fsf_qual[0], sizeof (u64));
 614         debug_event(adapter->abort_dbf, 1, &dbf_fsf_qual[1], sizeof (u64));
 615         debug_text_event(adapter->abort_dbf, 1, dbf_result);
 616
 617         spin_lock_irq(scsi_host->host_lock);
 618         return retval;
 619 }
 620
 621 /*
 622  * function:    zfcp_scsi_eh_device_reset_handler
 623  *
 624  * purpose:
 625  *
 626  * returns:
 627  */
 628 int
 629 zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 630 {
 631         int retval;
 632         struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
 633         struct Scsi_Host *scsi_host = scpnt->device->host;
 634
 635         spin_unlock_irq(scsi_host->host_lock);
 636
 637         if (!unit) {
 638                 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
 639                 retval = SUCCESS;
 640                 goto out;
 641         }
 642         ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun);
 643
 644         /*
 645          * If we do not know whether the unit supports 'logical unit reset'
 646          * then try 'logical unit reset' and proceed with 'target reset'
 647          * if 'logical unit reset' fails.
 648          * If the unit is known not to support 'logical unit reset' then
 649          * skip 'logical unit reset' and try 'target reset' immediately.
 650          */
 651         if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 652                               &unit->status)) {
 653                 retval =
 654                     zfcp_task_management_function(unit, LOGICAL_UNIT_RESET);
 655                 if (retval) {
 656                         ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit);
 657                         if (retval == -ENOTSUPP)
 658                                 atomic_set_mask
 659                                     (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
 660                                      &unit->status);
 661                         /* fall through and try 'target reset' next */
 662                 } else {
 663                         ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n",
 664                                        unit);
 665                         /* avoid 'target reset' */
 666                         retval = SUCCESS;
 667                         goto out;
 668                 }
 669         }
 670         retval = zfcp_task_management_function(unit, TARGET_RESET);
 671         if (retval) {
 672                 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit);
 673                 retval = FAILED;
 674         } else {
 675                 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit);
 676                 retval = SUCCESS;
 677         }
 678  out:
 679         spin_lock_irq(scsi_host->host_lock);
 680         return retval;
 681 }
 682
 683 static int
 684 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags)
 685 {
 686         struct zfcp_adapter *adapter = unit->port->adapter;
 687         int retval;
 688         int status;
 689         struct zfcp_fsf_req *fsf_req;
 690
 691         /* issue task management function */
 692         fsf_req = zfcp_fsf_send_fcp_command_task_management
 693                 (adapter, unit, tm_flags, 0);
 694         if (!fsf_req) {
 695                 ZFCP_LOG_INFO("error: creation of task management request "
 696                               "failed for unit 0x%016Lx on port 0x%016Lx on  "
 697                               "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
 698                               zfcp_get_busid_by_adapter(adapter));
 699                 retval = -ENOMEM;
 700                 goto out;
 701         }
 702
 703         retval = zfcp_fsf_req_wait_and_cleanup(fsf_req,
 704                                                ZFCP_UNINTERRUPTIBLE, &status);
 705         /*
 706          * check completion status of task management function
 707          * (status should always be valid since no signals permitted)
 708          */
 709         if (status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED)
 710                 retval = -EIO;
 711         else if (status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP)
 712                 retval = -ENOTSUPP;
 713         else
 714                 retval = 0;
 715  out:
 716         return retval;
 717 }
 718
 719 /*
 720  * function:    zfcp_scsi_eh_bus_reset_handler
 721  *
 722  * purpose:
 723  *
 724  * returns:
 725  */
 726 int
 727 zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *scpnt)
 728 {
 729         int retval = 0;
 730         struct zfcp_unit *unit;
 731         struct Scsi_Host *scsi_host = scpnt->device->host;
 732
 733         spin_unlock_irq(scsi_host->host_lock);
 734
 735         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 736         ZFCP_LOG_NORMAL("bus reset because of problems with "
 737                         "unit 0x%016Lx\n", unit->fcp_lun);
 738         zfcp_erp_adapter_reopen(unit->port->adapter, 0);
 739         zfcp_erp_wait(unit->port->adapter);
 740         retval = SUCCESS;
 741
 742         spin_lock_irq(scsi_host->host_lock);
 743         return retval;
 744 }
 745
 746 /*
 747  * function:    zfcp_scsi_eh_host_reset_handler
 748  *
 749  * purpose:
 750  *
 751  * returns:
 752  */
 753 int
 754 zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 755 {
 756         int retval = 0;
 757         struct zfcp_unit *unit;
 758         struct Scsi_Host *scsi_host = scpnt->device->host;
 759
 760         spin_unlock_irq(scsi_host->host_lock);
 761
 762         unit = (struct zfcp_unit *) scpnt->device->hostdata;
 763         ZFCP_LOG_NORMAL("host reset because of problems with "
 764                         "unit 0x%016Lx\n", unit->fcp_lun);
 765         zfcp_erp_adapter_reopen(unit->port->adapter, 0);
 766         zfcp_erp_wait(unit->port->adapter);
 767         retval = SUCCESS;
 768
 769         spin_lock_irq(scsi_host->host_lock);
 770         return retval;
 771 }
 772
 773 /*
 774  * function:
 775  *
 776  * purpose:
 777  *
 778  * returns:
 779  */
 780 int
 781 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
 782 {
 783         int retval = 0;
 784         static unsigned int unique_id = 0;
 785
 786         /* register adapter as SCSI host with mid layer of SCSI stack */
 787         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
 788                                              sizeof (struct zfcp_adapter *));
 789         if (!adapter->scsi_host) {
 790                 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
 791                                 "for adapter %s ",
 792                                 zfcp_get_busid_by_adapter(adapter));
 793                 retval = -EIO;
 794                 goto out;
 795         }
 796         ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
 797
 798         /* tell the SCSI stack some characteristics of this adapter */
 799         adapter->scsi_host->max_id = 1;
 800         adapter->scsi_host->max_lun = 1;
 801         adapter->scsi_host->max_channel = 0;
 802         adapter->scsi_host->unique_id = unique_id++;    /* FIXME */
 803         adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
 804         adapter->scsi_host->transportt = zfcp_transport_template;
 805         /*
 806          * Reverse mapping of the host number to avoid race condition
 807          */
 808         adapter->scsi_host_no = adapter->scsi_host->host_no;
 809
 810         /*
 811          * save a pointer to our own adapter data structure within
 812          * hostdata field of SCSI host data structure
 813          */
 814         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 815
 816         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 817                 scsi_host_put(adapter->scsi_host);
 818                 retval = -EIO;
 819                 goto out;
 820         }
 821         atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 822  out:
 823         return retval;
 824 }
 825
 826 /*
 827  * function:
 828  *
 829  * purpose:
 830  *
 831  * returns:
 832  */
 833 void
 834 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
 835 {
 836         struct Scsi_Host *shost;
 837
 838         shost = adapter->scsi_host;
 839         if (!shost)
 840                 return;
 841         scsi_remove_host(shost);
 842         scsi_host_put(shost);
 843         adapter->scsi_host = NULL;
 844         adapter->scsi_host_no = 0;
 845         atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
 846
 847         return;
 848 }
 849
 850
 851 void
 852 zfcp_fsf_start_scsi_er_timer(struct zfcp_adapter *adapter)
 853 {
 854         adapter->scsi_er_timer.function = zfcp_fsf_scsi_er_timeout_handler;
 855         adapter->scsi_er_timer.data = (unsigned long) adapter;
 856         adapter->scsi_er_timer.expires = jiffies + ZFCP_SCSI_ER_TIMEOUT;
 857         add_timer(&adapter->scsi_er_timer);
 858 }
 859
 860 /*
 861  * Support functions for FC transport class
 862  */
 863 static void
 864 zfcp_get_port_id(struct scsi_target *starget)
 865 {
 866         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 867         struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0];
 868         struct zfcp_port *port;
 869         unsigned long flags;
 870
 871         read_lock_irqsave(&zfcp_data.config_lock, flags);
 872         port = zfcp_port_lookup(adapter, starget->channel, starget->id);
 873         if (port)
 874                 fc_starget_port_id(starget) = port->d_id;
 875         else
 876                 fc_starget_port_id(starget) = -1;
 877         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 878 }
 879
 880 static void
 881 zfcp_get_port_name(struct scsi_target *starget)
 882 {
 883         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 884         struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0];
 885         struct zfcp_port *port;
 886         unsigned long flags;
 887
 888         read_lock_irqsave(&zfcp_data.config_lock, flags);
 889         port = zfcp_port_lookup(adapter, starget->channel, starget->id);
 890         if (port)
 891                 fc_starget_port_name(starget) = port->wwpn;
 892         else
 893                 fc_starget_port_name(starget) = -1;
 894         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 895 }
 896
 897 static void
 898 zfcp_get_node_name(struct scsi_target *starget)
 899 {
 900         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 901         struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0];
 902         struct zfcp_port *port;
 903         unsigned long flags;
 904
 905         read_lock_irqsave(&zfcp_data.config_lock, flags);
 906         port = zfcp_port_lookup(adapter, starget->channel, starget->id);
 907         if (port)
 908                 fc_starget_node_name(starget) = port->wwnn;
 909         else
 910                 fc_starget_node_name(starget) = -1;
 911         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 912 }
 913
 914 struct fc_function_template zfcp_transport_functions = {
 915         .get_starget_port_id = zfcp_get_port_id,
 916         .get_starget_port_name = zfcp_get_port_name,
 917         .get_starget_node_name = zfcp_get_node_name,
 918         .show_starget_port_id = 1,
 919         .show_starget_port_name = 1,
 920         .show_starget_node_name = 1,
 921 };
 922
 923 /**
 924  * ZFCP_DEFINE_SCSI_ATTR
 925  * @_name:   name of show attribute
 926  * @_format: format string
 927  * @_value:  value to print
 928  *
 929  * Generates attribute for a unit.
 930  */
 931 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)                    \
 932 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev,        \
 933                                               char *buf)                 \
 934 {                                                                        \
 935         struct scsi_device *sdev;                                        \
 936         struct zfcp_unit *unit;                                          \
 937                                                                          \
 938         sdev = to_scsi_device(dev);                                      \
 939         unit = sdev->hostdata;                                           \
 940         return sprintf(buf, _format, _value);                            \
 941 }                                                                        \
 942                                                                          \
 943 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
 944
 945 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
 946 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
 947 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
 948
 949 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
 950         &dev_attr_fcp_lun,
 951         &dev_attr_wwpn,
 952         &dev_attr_hba_id,
 953         NULL
 954 };
 955
 956 #undef ZFCP_LOG_AREA