sys/cam/scsi/scsi_pt.c

   1 /*-
   2  * Implementation of SCSI Processor Target Peripheral driver for CAM.
   3  *
   4  * Copyright (c) 1998 Justin T. Gibbs.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions, and the following disclaimer,
  12  *    without modification, immediately at the beginning of the file.
  13  * 2. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  20  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include <sys/param.h>
  33 #include <sys/queue.h>
  34 #include <sys/systm.h>
  35 #include <sys/kernel.h>
  36 #include <sys/types.h>
  37 #include <sys/bio.h>
  38 #include <sys/devicestat.h>
  39 #include <sys/malloc.h>
  40 #include <sys/conf.h>
  41 #include <sys/ptio.h>
  42
  43 #include <cam/cam.h>
  44 #include <cam/cam_ccb.h>
  45 #include <cam/cam_periph.h>
  46 #include <cam/cam_xpt_periph.h>
  47 #include <cam/cam_debug.h>
  48
  49 #include <cam/scsi/scsi_all.h>
  50 #include <cam/scsi/scsi_message.h>
  51 #include <cam/scsi/scsi_pt.h>
  52
  53 #include "opt_pt.h"
  54
  55 typedef enum {
  56         PT_STATE_PROBE,
  57         PT_STATE_NORMAL
  58 } pt_state;
  59
  60 typedef enum {
  61         PT_FLAG_NONE            = 0x00,
  62         PT_FLAG_OPEN            = 0x01,
  63         PT_FLAG_DEVICE_INVALID  = 0x02,
  64         PT_FLAG_RETRY_UA        = 0x04
  65 } pt_flags;
  66
  67 typedef enum {
  68         PT_CCB_BUFFER_IO        = 0x01,
  69         PT_CCB_WAITING          = 0x02,
  70         PT_CCB_RETRY_UA         = 0x04,
  71         PT_CCB_BUFFER_IO_UA     = PT_CCB_BUFFER_IO|PT_CCB_RETRY_UA
  72 } pt_ccb_state;
  73
  74 /* Offsets into our private area for storing information */
  75 #define ccb_state       ppriv_field0
  76 #define ccb_bp          ppriv_ptr1
  77
  78 struct pt_softc {
  79         struct   bio_queue_head bio_queue;
  80         struct   devstat *device_stats;
  81         LIST_HEAD(, ccb_hdr) pending_ccbs;
  82         pt_state state;
  83         pt_flags flags;
  84         union    ccb saved_ccb;
  85         int      io_timeout;
  86         struct cdev *dev;
  87 };
  88
  89 static  d_open_t        ptopen;
  90 static  d_close_t       ptclose;
  91 static  d_strategy_t    ptstrategy;
  92 static  periph_init_t   ptinit;
  93 static  void            ptasync(void *callback_arg, u_int32_t code,
  94                                 struct cam_path *path, void *arg);
  95 static  periph_ctor_t   ptctor;
  96 static  periph_oninv_t  ptoninvalidate;
  97 static  periph_dtor_t   ptdtor;
  98 static  periph_start_t  ptstart;
  99 static  void            ptdone(struct cam_periph *periph,
 100                                union ccb *done_ccb);
 101 static  d_ioctl_t       ptioctl;
 102 static  int             pterror(union ccb *ccb, u_int32_t cam_flags,
 103                                 u_int32_t sense_flags);
 104
 105 void    scsi_send_receive(struct ccb_scsiio *csio, u_int32_t retries,
 106                           void (*cbfcnp)(struct cam_periph *, union ccb *),
 107                           u_int tag_action, int readop, u_int byte2,
 108                           u_int32_t xfer_len, u_int8_t *data_ptr,
 109                           u_int8_t sense_len, u_int32_t timeout);
 110
 111 static struct periph_driver ptdriver =
 112 {
 113         ptinit, "pt",
 114         TAILQ_HEAD_INITIALIZER(ptdriver.units), /* generation */ 0
 115 };
 116
 117 PERIPHDRIVER_DECLARE(pt, ptdriver);
 118
 119
 120 static struct cdevsw pt_cdevsw = {
 121         .d_version =    D_VERSION,
 122         .d_flags =      0,
 123         .d_open =       ptopen,
 124         .d_close =      ptclose,
 125         .d_read =       physread,
 126         .d_write =      physwrite,
 127         .d_ioctl =      ptioctl,
 128         .d_strategy =   ptstrategy,
 129         .d_name =       "pt",
 130 };
 131
 132 #ifndef SCSI_PT_DEFAULT_TIMEOUT
 133 #define SCSI_PT_DEFAULT_TIMEOUT         60
 134 #endif
 135
 136 static int
 137 ptopen(struct cdev *dev, int flags, int fmt, struct thread *td)
 138 {
 139         struct cam_periph *periph;
 140         struct pt_softc *softc;
 141         int error = 0;
 142
 143         periph = (struct cam_periph *)dev->si_drv1;
 144         if (cam_periph_acquire(periph) != CAM_REQ_CMP)
 145                 return (ENXIO);
 146
 147         softc = (struct pt_softc *)periph->softc;
 148
 149         cam_periph_lock(periph);
 150         if (softc->flags & PT_FLAG_DEVICE_INVALID) {
 151                 cam_periph_release_locked(periph);
 152                 cam_periph_unlock(periph);
 153                 return(ENXIO);
 154         }
 155
 156         if ((softc->flags & PT_FLAG_OPEN) == 0)
 157                 softc->flags |= PT_FLAG_OPEN;
 158         else {
 159                 error = EBUSY;
 160                 cam_periph_release(periph);
 161         }
 162
 163         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
 164             ("ptopen: dev=%s\n", devtoname(dev)));
 165
 166         cam_periph_unlock(periph);
 167         return (error);
 168 }
 169
 170 static int
 171 ptclose(struct cdev *dev, int flag, int fmt, struct thread *td)
 172 {
 173         struct  cam_periph *periph;
 174         struct  pt_softc *softc;
 175
 176         periph = (struct cam_periph *)dev->si_drv1;
 177         if (periph == NULL)
 178                 return (ENXIO);
 179
 180         softc = (struct pt_softc *)periph->softc;
 181
 182         cam_periph_lock(periph);
 183
 184         softc->flags &= ~PT_FLAG_OPEN;
 185         cam_periph_release_locked(periph);
 186         cam_periph_unlock(periph);
 187         return (0);
 188 }
 189
 190 /*
 191  * Actually translate the requested transfer into one the physical driver
 192  * can understand.  The transfer is described by a buf and will include
 193  * only one physical transfer.
 194  */
 195 static void
 196 ptstrategy(struct bio *bp)
 197 {
 198         struct cam_periph *periph;
 199         struct pt_softc *softc;
 200
 201         periph = (struct cam_periph *)bp->bio_dev->si_drv1;
 202         bp->bio_resid = bp->bio_bcount;
 203         if (periph == NULL) {
 204                 biofinish(bp, NULL, ENXIO);
 205                 return;
 206         }
 207         cam_periph_lock(periph);
 208         softc = (struct pt_softc *)periph->softc;
 209
 210         /*
 211          * If the device has been made invalid, error out
 212          */
 213         if ((softc->flags & PT_FLAG_DEVICE_INVALID)) {
 214                 cam_periph_unlock(periph);
 215                 biofinish(bp, NULL, ENXIO);
 216                 return;
 217         }
 218
 219         /*
 220          * Place it in the queue of disk activities for this disk
 221          */
 222         bioq_insert_tail(&softc->bio_queue, bp);
 223
 224         /*
 225          * Schedule ourselves for performing the work.
 226          */
 227         xpt_schedule(periph, CAM_PRIORITY_NORMAL);
 228         cam_periph_unlock(periph);
 229
 230         return;
 231 }
 232
 233 static void
 234 ptinit(void)
 235 {
 236         cam_status status;
 237
 238         /*
 239          * Install a global async callback.  This callback will
 240          * receive async callbacks like "new device found".
 241          */
 242         status = xpt_register_async(AC_FOUND_DEVICE, ptasync, NULL, NULL);
 243
 244         if (status != CAM_REQ_CMP) {
 245                 printf("pt: Failed to attach master async callback "
 246                        "due to status 0x%x!\n", status);
 247         }
 248 }
 249
 250 static cam_status
 251 ptctor(struct cam_periph *periph, void *arg)
 252 {
 253         struct pt_softc *softc;
 254         struct ccb_getdev *cgd;
 255         struct ccb_pathinq cpi;
 256
 257         cgd = (struct ccb_getdev *)arg;
 258         if (cgd == NULL) {
 259                 printf("ptregister: no getdev CCB, can't register device\n");
 260                 return(CAM_REQ_CMP_ERR);
 261         }
 262
 263         softc = (struct pt_softc *)malloc(sizeof(*softc),M_DEVBUF,M_NOWAIT);
 264
 265         if (softc == NULL) {
 266                 printf("daregister: Unable to probe new device. "
 267                        "Unable to allocate softc\n");
 268                 return(CAM_REQ_CMP_ERR);
 269         }
 270
 271         bzero(softc, sizeof(*softc));
 272         LIST_INIT(&softc->pending_ccbs);
 273         softc->state = PT_STATE_NORMAL;
 274         bioq_init(&softc->bio_queue);
 275
 276         softc->io_timeout = SCSI_PT_DEFAULT_TIMEOUT * 1000;
 277
 278         periph->softc = softc;
 279
 280         bzero(&cpi, sizeof(cpi));
 281         xpt_setup_ccb(&cpi.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 282         cpi.ccb_h.func_code = XPT_PATH_INQ;
 283         xpt_action((union ccb *)&cpi);
 284
 285         cam_periph_unlock(periph);
 286         softc->device_stats = devstat_new_entry("pt",
 287                           periph->unit_number, 0,
 288                           DEVSTAT_NO_BLOCKSIZE,
 289                           SID_TYPE(&cgd->inq_data) |
 290                           XPORT_DEVSTAT_TYPE(cpi.transport),
 291                           DEVSTAT_PRIORITY_OTHER);
 292
 293         softc->dev = make_dev(&pt_cdevsw, periph->unit_number, UID_ROOT,
 294                               GID_OPERATOR, 0600, "%s%d", periph->periph_name,
 295                               periph->unit_number);
 296         cam_periph_lock(periph);
 297         softc->dev->si_drv1 = periph;
 298
 299         /*
 300          * Add async callbacks for bus reset and
 301          * bus device reset calls.  I don't bother
 302          * checking if this fails as, in most cases,
 303          * the system will function just fine without
 304          * them and the only alternative would be to
 305          * not attach the device on failure.
 306          */
 307         xpt_register_async(AC_SENT_BDR | AC_BUS_RESET | AC_LOST_DEVICE,
 308                            ptasync, periph, periph->path);
 309
 310         /* Tell the user we've attached to the device */
 311         xpt_announce_periph(periph, NULL);
 312
 313         return(CAM_REQ_CMP);
 314 }
 315
 316 static void
 317 ptoninvalidate(struct cam_periph *periph)
 318 {
 319         struct pt_softc *softc;
 320
 321         softc = (struct pt_softc *)periph->softc;
 322
 323         /*
 324          * De-register any async callbacks.
 325          */
 326         xpt_register_async(0, ptasync, periph, periph->path);
 327
 328         softc->flags |= PT_FLAG_DEVICE_INVALID;
 329
 330         /*
 331          * Return all queued I/O with ENXIO.
 332          * XXX Handle any transactions queued to the card
 333          *     with XPT_ABORT_CCB.
 334          */
 335         bioq_flush(&softc->bio_queue, NULL, ENXIO);
 336
 337         xpt_print(periph->path, "lost device\n");
 338 }
 339
 340 static void
 341 ptdtor(struct cam_periph *periph)
 342 {
 343         struct pt_softc *softc;
 344
 345         softc = (struct pt_softc *)periph->softc;
 346
 347         xpt_print(periph->path, "removing device entry\n");
 348         devstat_remove_entry(softc->device_stats);
 349         cam_periph_unlock(periph);
 350         destroy_dev(softc->dev);
 351         cam_periph_lock(periph);
 352         free(softc, M_DEVBUF);
 353 }
 354
 355 static void
 356 ptasync(void *callback_arg, u_int32_t code, struct cam_path *path, void *arg)
 357 {
 358         struct cam_periph *periph;
 359
 360         periph = (struct cam_periph *)callback_arg;
 361         switch (code) {
 362         case AC_FOUND_DEVICE:
 363         {
 364                 struct ccb_getdev *cgd;
 365                 cam_status status;
 366
 367                 cgd = (struct ccb_getdev *)arg;
 368                 if (cgd == NULL)
 369                         break;
 370
 371                 if (cgd->protocol != PROTO_SCSI)
 372                         break;
 373
 374                 if (SID_TYPE(&cgd->inq_data) != T_PROCESSOR)
 375                         break;
 376
 377                 /*
 378                  * Allocate a peripheral instance for
 379                  * this device and start the probe
 380                  * process.
 381                  */
 382                 status = cam_periph_alloc(ptctor, ptoninvalidate, ptdtor,
 383                                           ptstart, "pt", CAM_PERIPH_BIO,
 384                                           cgd->ccb_h.path, ptasync,
 385                                           AC_FOUND_DEVICE, cgd);
 386
 387                 if (status != CAM_REQ_CMP
 388                  && status != CAM_REQ_INPROG)
 389                         printf("ptasync: Unable to attach to new device "
 390                                 "due to status 0x%x\n", status);
 391                 break;
 392         }
 393         case AC_SENT_BDR:
 394         case AC_BUS_RESET:
 395         {
 396                 struct pt_softc *softc;
 397                 struct ccb_hdr *ccbh;
 398
 399                 softc = (struct pt_softc *)periph->softc;
 400                 /*
 401                  * Don't fail on the expected unit attention
 402                  * that will occur.
 403                  */
 404                 softc->flags |= PT_FLAG_RETRY_UA;
 405                 LIST_FOREACH(ccbh, &softc->pending_ccbs, periph_links.le)
 406                         ccbh->ccb_state |= PT_CCB_RETRY_UA;
 407         }
 408         /* FALLTHROUGH */
 409         default:
 410                 cam_periph_async(periph, code, path, arg);
 411                 break;
 412         }
 413 }
 414
 415 static void
 416 ptstart(struct cam_periph *periph, union ccb *start_ccb)
 417 {
 418         struct pt_softc *softc;
 419         struct bio *bp;
 420
 421         softc = (struct pt_softc *)periph->softc;
 422
 423         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("ptstart\n"));
 424
 425         /*
 426          * See if there is a buf with work for us to do..
 427          */
 428         bp = bioq_first(&softc->bio_queue);
 429         if (periph->immediate_priority <= periph->pinfo.priority) {
 430                 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 431                                 ("queuing for immediate ccb\n"));
 432                 start_ccb->ccb_h.ccb_state = PT_CCB_WAITING;
 433                 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
 434                                   periph_links.sle);
 435                 periph->immediate_priority = CAM_PRIORITY_NONE;
 436                 wakeup(&periph->ccb_list);
 437         } else if (bp == NULL) {
 438                 xpt_release_ccb(start_ccb);
 439         } else {
 440                 bioq_remove(&softc->bio_queue, bp);
 441
 442                 devstat_start_transaction_bio(softc->device_stats, bp);
 443
 444                 scsi_send_receive(&start_ccb->csio,
 445                                   /*retries*/4,
 446                                   ptdone,
 447                                   MSG_SIMPLE_Q_TAG,
 448                                   bp->bio_cmd == BIO_READ,
 449                                   /*byte2*/0,
 450                                   bp->bio_bcount,
 451                                   bp->bio_data,
 452                                   /*sense_len*/SSD_FULL_SIZE,
 453                                   /*timeout*/softc->io_timeout);
 454
 455                 start_ccb->ccb_h.ccb_state = PT_CCB_BUFFER_IO_UA;
 456
 457                 /*
 458                  * Block out any asyncronous callbacks
 459                  * while we touch the pending ccb list.
 460                  */
 461                 LIST_INSERT_HEAD(&softc->pending_ccbs, &start_ccb->ccb_h,
 462                                  periph_links.le);
 463
 464                 start_ccb->ccb_h.ccb_bp = bp;
 465                 bp = bioq_first(&softc->bio_queue);
 466
 467                 xpt_action(start_ccb);
 468
 469                 if (bp != NULL) {
 470                         /* Have more work to do, so ensure we stay scheduled */
 471                         xpt_schedule(periph, CAM_PRIORITY_NORMAL);
 472                 }
 473         }
 474 }
 475
 476 static void
 477 ptdone(struct cam_periph *periph, union ccb *done_ccb)
 478 {
 479         struct pt_softc *softc;
 480         struct ccb_scsiio *csio;
 481
 482         softc = (struct pt_softc *)periph->softc;
 483
 484         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("ptdone\n"));
 485
 486         csio = &done_ccb->csio;
 487         switch (csio->ccb_h.ccb_state) {
 488         case PT_CCB_BUFFER_IO:
 489         case PT_CCB_BUFFER_IO_UA:
 490         {
 491                 struct bio *bp;
 492
 493                 bp = (struct bio *)done_ccb->ccb_h.ccb_bp;
 494                 if ((done_ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
 495                         int error;
 496                         int sf;
 497
 498                         if ((csio->ccb_h.ccb_state & PT_CCB_RETRY_UA) != 0)
 499                                 sf = SF_RETRY_UA;
 500                         else
 501                                 sf = 0;
 502
 503                         error = pterror(done_ccb, CAM_RETRY_SELTO, sf);
 504                         if (error == ERESTART) {
 505                                 /*
 506                                  * A retry was scheuled, so
 507                                  * just return.
 508                                  */
 509                                 return;
 510                         }
 511                         if (error != 0) {
 512                                 if (error == ENXIO) {
 513                                         /*
 514                                          * Catastrophic error.  Mark our device
 515                                          * as invalid.
 516                                          */
 517                                         xpt_print(periph->path,
 518                                             "Invalidating device\n");
 519                                         softc->flags |= PT_FLAG_DEVICE_INVALID;
 520                                 }
 521
 522                                 /*
 523                                  * return all queued I/O with EIO, so that
 524                                  * the client can retry these I/Os in the
 525                                  * proper order should it attempt to recover.
 526                                  */
 527                                 bioq_flush(&softc->bio_queue, NULL, EIO);
 528                                 bp->bio_error = error;
 529                                 bp->bio_resid = bp->bio_bcount;
 530                                 bp->bio_flags |= BIO_ERROR;
 531                         } else {
 532                                 bp->bio_resid = csio->resid;
 533                                 bp->bio_error = 0;
 534                                 if (bp->bio_resid != 0) {
 535                                         /* Short transfer ??? */
 536                                         bp->bio_flags |= BIO_ERROR;
 537                                 }
 538                         }
 539                         if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
 540                                 cam_release_devq(done_ccb->ccb_h.path,
 541                                                  /*relsim_flags*/0,
 542                                                  /*reduction*/0,
 543                                                  /*timeout*/0,
 544                                                  /*getcount_only*/0);
 545                 } else {
 546                         bp->bio_resid = csio->resid;
 547                         if (bp->bio_resid != 0)
 548                                 bp->bio_flags |= BIO_ERROR;
 549                 }
 550
 551                 /*
 552                  * Block out any asyncronous callbacks
 553                  * while we touch the pending ccb list.
 554                  */
 555                 LIST_REMOVE(&done_ccb->ccb_h, periph_links.le);
 556
 557                 biofinish(bp, softc->device_stats, 0);
 558                 break;
 559         }
 560         case PT_CCB_WAITING:
 561                 /* Caller will release the CCB */
 562                 wakeup(&done_ccb->ccb_h.cbfcnp);
 563                 return;
 564         }
 565         xpt_release_ccb(done_ccb);
 566 }
 567
 568 static int
 569 pterror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
 570 {
 571         struct pt_softc   *softc;
 572         struct cam_periph *periph;
 573
 574         periph = xpt_path_periph(ccb->ccb_h.path);
 575         softc = (struct pt_softc *)periph->softc;
 576
 577         return(cam_periph_error(ccb, cam_flags, sense_flags,
 578                                 &softc->saved_ccb));
 579 }
 580
 581 static int
 582 ptioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
 583 {
 584         struct cam_periph *periph;
 585         struct pt_softc *softc;
 586         int error = 0;
 587
 588         periph = (struct cam_periph *)dev->si_drv1;
 589         if (periph == NULL)
 590                 return(ENXIO);
 591
 592         softc = (struct pt_softc *)periph->softc;
 593
 594         cam_periph_lock(periph);
 595
 596         switch(cmd) {
 597         case PTIOCGETTIMEOUT:
 598                 if (softc->io_timeout >= 1000)
 599                         *(int *)addr = softc->io_timeout / 1000;
 600                 else
 601                         *(int *)addr = 0;
 602                 break;
 603         case PTIOCSETTIMEOUT:
 604                 if (*(int *)addr < 1) {
 605                         error = EINVAL;
 606                         break;
 607                 }
 608
 609                 softc->io_timeout = *(int *)addr * 1000;
 610
 611                 break;
 612         default:
 613                 error = cam_periph_ioctl(periph, cmd, addr, pterror);
 614                 break;
 615         }
 616
 617         cam_periph_unlock(periph);
 618
 619         return(error);
 620 }
 621
 622 void
 623 scsi_send_receive(struct ccb_scsiio *csio, u_int32_t retries,
 624                   void (*cbfcnp)(struct cam_periph *, union ccb *),
 625                   u_int tag_action, int readop, u_int byte2,
 626                   u_int32_t xfer_len, u_int8_t *data_ptr, u_int8_t sense_len,
 627                   u_int32_t timeout)
 628 {
 629         struct scsi_send_receive *scsi_cmd;
 630
 631         scsi_cmd = (struct scsi_send_receive *)&csio->cdb_io.cdb_bytes;
 632         scsi_cmd->opcode = readop ? RECEIVE : SEND;
 633         scsi_cmd->byte2 = byte2;
 634         scsi_ulto3b(xfer_len, scsi_cmd->xfer_len);
 635         scsi_cmd->control = 0;
 636
 637         cam_fill_csio(csio,
 638                       retries,
 639                       cbfcnp,
 640                       /*flags*/readop ? CAM_DIR_IN : CAM_DIR_OUT,
 641                       tag_action,
 642                       data_ptr,
 643                       xfer_len,
 644                       sense_len,
 645                       sizeof(*scsi_cmd),
 646                       timeout);
 647 }