scsi_pt.c revision 46625
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 * $Id: scsi_pt.c,v 1.5 1999/02/10 00:03:15 ken Exp $ 29 */ 30 31#include <sys/param.h> 32#include <sys/queue.h> 33#include <sys/systm.h> 34#include <sys/kernel.h> 35#include <sys/types.h> 36#include <sys/buf.h> 37#include <sys/devicestat.h> 38#include <sys/malloc.h> 39#include <sys/conf.h> 40 41#include <cam/cam.h> 42#include <cam/cam_ccb.h> 43#include <cam/cam_extend.h> 44#include <cam/cam_periph.h> 45#include <cam/cam_xpt_periph.h> 46#include <cam/cam_debug.h> 47 48#include <cam/scsi/scsi_all.h> 49#include <cam/scsi/scsi_message.h> 50#include <cam/scsi/scsi_pt.h> 51 52typedef enum { 53 PT_STATE_PROBE, 54 PT_STATE_NORMAL 55} pt_state; 56 57typedef enum { 58 PT_FLAG_NONE = 0x00, 59 PT_FLAG_OPEN = 0x01, 60 PT_FLAG_DEVICE_INVALID = 0x02, 61 PT_FLAG_RETRY_UA = 0x04 62} pt_flags; 63 64typedef enum { 65 PT_CCB_BUFFER_IO = 0x01, 66 PT_CCB_WAITING = 0x02, 67 PT_CCB_RETRY_UA = 0x04, 68 PT_CCB_BUFFER_IO_UA = PT_CCB_BUFFER_IO|PT_CCB_RETRY_UA 69} pt_ccb_state; 70 71/* Offsets into our private area for storing information */ 72#define ccb_state ppriv_field0 73#define ccb_bp ppriv_ptr1 74 75struct pt_softc { 76 struct buf_queue_head buf_queue; 77 struct devstat device_stats; 78 LIST_HEAD(, ccb_hdr) pending_ccbs; 79 pt_state state; 80 pt_flags flags; 81 union ccb saved_ccb; 82}; 83 84static d_open_t ptopen; 85static d_close_t ptclose; 86static d_strategy_t ptstrategy; 87static periph_init_t ptinit; 88static void ptasync(void *callback_arg, u_int32_t code, 89 struct cam_path *path, void *arg); 90static periph_ctor_t ptctor; 91static periph_oninv_t ptoninvalidate; 92static periph_dtor_t ptdtor; 93static periph_start_t ptstart; 94static void ptdone(struct cam_periph *periph, 95 union ccb *done_ccb); 96static int pterror(union ccb *ccb, u_int32_t cam_flags, 97 u_int32_t sense_flags); 98 99void scsi_send_receive(struct ccb_scsiio *csio, u_int32_t retries, 100 void (*cbfcnp)(struct cam_periph *, union ccb *), 101 u_int tag_action, int readop, u_int byte2, 102 u_int32_t xfer_len, u_int8_t *data_ptr, 103 u_int8_t sense_len, u_int32_t timeout); 104 105static struct periph_driver ptdriver = 106{ 107 ptinit, "pt", 108 TAILQ_HEAD_INITIALIZER(ptdriver.units), /* generation */ 0 109}; 110 111DATA_SET(periphdriver_set, ptdriver); 112 113#define PT_CDEV_MAJOR 61 114 115static struct cdevsw pt_cdevsw = 116{ 117 /*d_open*/ ptopen, 118 /*d_close*/ ptclose, 119 /*d_read*/ physread, 120 /*d_write*/ physwrite, 121 /*d_ioctl*/ noioctl, 122 /*d_stop*/ nostop, 123 /*d_reset*/ noreset, 124 /*d_devtotty*/ nodevtotty, 125 /*d_poll*/ seltrue, 126 /*d_mmap*/ nommap, 127 /*d_strategy*/ ptstrategy, 128 /*d_name*/ "pt", 129 /*d_spare*/ NULL, 130 /*d_maj*/ -1, 131 /*d_dump*/ nodump, 132 /*d_psize*/ nopsize, 133 /*d_flags*/ 0, 134 /*d_maxio*/ 0, 135 /*b_maj*/ -1 136}; 137 138static struct extend_array *ptperiphs; 139 140static int 141ptopen(dev_t dev, int flags, int fmt, struct proc *p) 142{ 143 struct cam_periph *periph; 144 struct pt_softc *softc; 145 int unit; 146 int error; 147 int s; 148 149 unit = minor(dev); 150 periph = cam_extend_get(ptperiphs, unit); 151 if (periph == NULL) 152 return (ENXIO); 153 154 softc = (struct pt_softc *)periph->softc; 155 156 s = splsoftcam(); 157 if (softc->flags & PT_FLAG_DEVICE_INVALID) { 158 splx(s); 159 return(ENXIO); 160 } 161 162 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, 163 ("ptopen: dev=0x%x (unit %d)\n", dev, unit)); 164 165 if ((error = cam_periph_lock(periph, PRIBIO|PCATCH)) != 0) { 166 splx(s); 167 return (error); /* error code from tsleep */ 168 } 169 170 splx(s); 171 172 if ((softc->flags & PT_FLAG_OPEN) == 0) { 173 if (cam_periph_acquire(periph) != CAM_REQ_CMP) 174 error = ENXIO; 175 else 176 softc->flags |= PT_FLAG_OPEN; 177 } else 178 error = EBUSY; 179 180 cam_periph_unlock(periph); 181 return (error); 182} 183 184static int 185ptclose(dev_t dev, int flag, int fmt, struct proc *p) 186{ 187 struct cam_periph *periph; 188 struct pt_softc *softc; 189 int unit; 190 int error; 191 192 unit = minor(dev); 193 periph = cam_extend_get(ptperiphs, unit); 194 if (periph == NULL) 195 return (ENXIO); 196 197 softc = (struct pt_softc *)periph->softc; 198 199 if ((error = cam_periph_lock(periph, PRIBIO)) != 0) 200 return (error); /* error code from tsleep */ 201 202 softc->flags &= ~PT_FLAG_OPEN; 203 cam_periph_unlock(periph); 204 cam_periph_release(periph); 205 return (0); 206} 207 208/* 209 * Actually translate the requested transfer into one the physical driver 210 * can understand. The transfer is described by a buf and will include 211 * only one physical transfer. 212 */ 213static void 214ptstrategy(struct buf *bp) 215{ 216 struct cam_periph *periph; 217 struct pt_softc *softc; 218 u_int unit; 219 int s; 220 221 unit = minor(bp->b_dev); 222 periph = cam_extend_get(ptperiphs, unit); 223 if (periph == NULL) { 224 bp->b_error = ENXIO; 225 goto bad; 226 } 227 softc = (struct pt_softc *)periph->softc; 228 229 /* 230 * Mask interrupts so that the pack cannot be invalidated until 231 * after we are in the queue. Otherwise, we might not properly 232 * clean up one of the buffers. 233 */ 234 s = splbio(); 235 236 /* 237 * If the device has been made invalid, error out 238 */ 239 if ((softc->flags & PT_FLAG_DEVICE_INVALID)) { 240 splx(s); 241 bp->b_error = ENXIO; 242 goto bad; 243 } 244 245 /* 246 * Place it in the queue of disk activities for this disk 247 */ 248 bufq_insert_tail(&softc->buf_queue, bp); 249 250 splx(s); 251 252 /* 253 * Schedule ourselves for performing the work. 254 */ 255 xpt_schedule(periph, /* XXX priority */1); 256 257 return; 258bad: 259 bp->b_flags |= B_ERROR; 260 261 /* 262 * Correctly set the buf to indicate a completed xfer 263 */ 264 bp->b_resid = bp->b_bcount; 265 biodone(bp); 266} 267 268static void 269ptinit(void) 270{ 271 cam_status status; 272 struct cam_path *path; 273 274 /* 275 * Create our extend array for storing the devices we attach to. 276 */ 277 ptperiphs = cam_extend_new(); 278 if (ptperiphs == NULL) { 279 printf("pt: Failed to alloc extend array!\n"); 280 return; 281 } 282 283 /* 284 * Install a global async callback. This callback will 285 * receive async callbacks like "new device found". 286 */ 287 status = xpt_create_path(&path, /*periph*/NULL, CAM_XPT_PATH_ID, 288 CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD); 289 290 if (status == CAM_REQ_CMP) { 291 struct ccb_setasync csa; 292 293 xpt_setup_ccb(&csa.ccb_h, path, /*priority*/5); 294 csa.ccb_h.func_code = XPT_SASYNC_CB; 295 csa.event_enable = AC_FOUND_DEVICE; 296 csa.callback = ptasync; 297 csa.callback_arg = NULL; 298 xpt_action((union ccb *)&csa); 299 status = csa.ccb_h.status; 300 xpt_free_path(path); 301 } 302 303 if (status != CAM_REQ_CMP) { 304 printf("pt: Failed to attach master async callback " 305 "due to status 0x%x!\n", status); 306 } else { 307 /* If we were successfull, register our devsw */ 308 dev_t dev; 309 310 dev = makedev(PT_CDEV_MAJOR, 0); 311 cdevsw_add(&dev,&pt_cdevsw, NULL); 312 } 313} 314 315static cam_status 316ptctor(struct cam_periph *periph, void *arg) 317{ 318 struct pt_softc *softc; 319 struct ccb_setasync csa; 320 struct ccb_getdev *cgd; 321 322 cgd = (struct ccb_getdev *)arg; 323 if (periph == NULL) { 324 printf("ptregister: periph was NULL!!\n"); 325 return(CAM_REQ_CMP_ERR); 326 } 327 328 if (cgd == NULL) { 329 printf("ptregister: no getdev CCB, can't register device\n"); 330 return(CAM_REQ_CMP_ERR); 331 } 332 333 softc = (struct pt_softc *)malloc(sizeof(*softc),M_DEVBUF,M_NOWAIT); 334 335 if (softc == NULL) { 336 printf("daregister: Unable to probe new device. " 337 "Unable to allocate softc\n"); 338 return(CAM_REQ_CMP_ERR); 339 } 340 341 bzero(softc, sizeof(*softc)); 342 LIST_INIT(&softc->pending_ccbs); 343 softc->state = PT_STATE_NORMAL; 344 bufq_init(&softc->buf_queue); 345 346 periph->softc = softc; 347 348 cam_extend_set(ptperiphs, periph->unit_number, periph); 349 350 /* 351 * The DA driver supports a blocksize, but 352 * we don't know the blocksize until we do 353 * a read capacity. So, set a flag to 354 * indicate that the blocksize is 355 * unavailable right now. We'll clear the 356 * flag as soon as we've done a read capacity. 357 */ 358 devstat_add_entry(&softc->device_stats, "pt", 359 periph->unit_number, 0, 360 DEVSTAT_NO_BLOCKSIZE, 361 cgd->pd_type | DEVSTAT_TYPE_IF_SCSI, 362 DEVSTAT_PRIORITY_OTHER); 363 364 /* 365 * Add async callbacks for bus reset and 366 * bus device reset calls. I don't bother 367 * checking if this fails as, in most cases, 368 * the system will function just fine without 369 * them and the only alternative would be to 370 * not attach the device on failure. 371 */ 372 xpt_setup_ccb(&csa.ccb_h, periph->path, /*priority*/5); 373 csa.ccb_h.func_code = XPT_SASYNC_CB; 374 csa.event_enable = AC_SENT_BDR | AC_BUS_RESET | AC_LOST_DEVICE; 375 csa.callback = ptasync; 376 csa.callback_arg = periph; 377 xpt_action((union ccb *)&csa); 378 379 /* Tell the user we've attached to the device */ 380 xpt_announce_periph(periph, NULL); 381 382 return(CAM_REQ_CMP); 383} 384 385static void 386ptoninvalidate(struct cam_periph *periph) 387{ 388 int s; 389 struct pt_softc *softc; 390 struct buf *q_bp; 391 struct ccb_setasync csa; 392 393 softc = (struct pt_softc *)periph->softc; 394 395 /* 396 * De-register any async callbacks. 397 */ 398 xpt_setup_ccb(&csa.ccb_h, periph->path, 399 /* priority */ 5); 400 csa.ccb_h.func_code = XPT_SASYNC_CB; 401 csa.event_enable = 0; 402 csa.callback = ptasync; 403 csa.callback_arg = periph; 404 xpt_action((union ccb *)&csa); 405 406 softc->flags |= PT_FLAG_DEVICE_INVALID; 407 408 /* 409 * Although the oninvalidate() routines are always called at 410 * splsoftcam, we need to be at splbio() here to keep the buffer 411 * queue from being modified while we traverse it. 412 */ 413 s = splbio(); 414 415 /* 416 * Return all queued I/O with ENXIO. 417 * XXX Handle any transactions queued to the card 418 * with XPT_ABORT_CCB. 419 */ 420 while ((q_bp = bufq_first(&softc->buf_queue)) != NULL){ 421 bufq_remove(&softc->buf_queue, q_bp); 422 q_bp->b_resid = q_bp->b_bcount; 423 q_bp->b_error = ENXIO; 424 q_bp->b_flags |= B_ERROR; 425 biodone(q_bp); 426 } 427 428 splx(s); 429 430 xpt_print_path(periph->path); 431 printf("lost device\n"); 432} 433 434static void 435ptdtor(struct cam_periph *periph) 436{ 437 struct pt_softc *softc; 438 439 softc = (struct pt_softc *)periph->softc; 440 441 devstat_remove_entry(&softc->device_stats); 442 443 cam_extend_release(ptperiphs, periph->unit_number); 444 xpt_print_path(periph->path); 445 printf("removing device entry\n"); 446 free(softc, M_DEVBUF); 447} 448 449static void 450ptasync(void *callback_arg, u_int32_t code, struct cam_path *path, void *arg) 451{ 452 struct cam_periph *periph; 453 454 periph = (struct cam_periph *)callback_arg; 455 switch (code) { 456 case AC_FOUND_DEVICE: 457 { 458 struct ccb_getdev *cgd; 459 cam_status status; 460 461 cgd = (struct ccb_getdev *)arg; 462 463 if (cgd->pd_type != T_PROCESSOR) 464 break; 465 466 /* 467 * Allocate a peripheral instance for 468 * this device and start the probe 469 * process. 470 */ 471 status = cam_periph_alloc(ptctor, ptoninvalidate, ptdtor, 472 ptstart, "pt", CAM_PERIPH_BIO, 473 cgd->ccb_h.path, ptasync, 474 AC_FOUND_DEVICE, cgd); 475 476 if (status != CAM_REQ_CMP 477 && status != CAM_REQ_INPROG) 478 printf("ptasync: Unable to attach to new device " 479 "due to status 0x%x\n", status); 480 break; 481 } 482 case AC_LOST_DEVICE: 483 { 484 cam_periph_invalidate(periph); 485 break; 486 } 487 case AC_SENT_BDR: 488 case AC_BUS_RESET: 489 { 490 struct pt_softc *softc; 491 struct ccb_hdr *ccbh; 492 int s; 493 494 softc = (struct pt_softc *)periph->softc; 495 s = splsoftcam(); 496 /* 497 * Don't fail on the expected unit attention 498 * that will occur. 499 */ 500 softc->flags |= PT_FLAG_RETRY_UA; 501 for (ccbh = LIST_FIRST(&softc->pending_ccbs); 502 ccbh != NULL; ccbh = LIST_NEXT(ccbh, periph_links.le)) 503 ccbh->ccb_state |= PT_CCB_RETRY_UA; 504 splx(s); 505 break; 506 } 507 case AC_TRANSFER_NEG: 508 case AC_SCSI_AEN: 509 case AC_UNSOL_RESEL: 510 default: 511 break; 512 } 513} 514 515static void 516ptstart(struct cam_periph *periph, union ccb *start_ccb) 517{ 518 struct pt_softc *softc; 519 struct buf *bp; 520 int s; 521 522 softc = (struct pt_softc *)periph->softc; 523 524 /* 525 * See if there is a buf with work for us to do.. 526 */ 527 s = splbio(); 528 bp = bufq_first(&softc->buf_queue); 529 if (periph->immediate_priority <= periph->pinfo.priority) { 530 CAM_DEBUG_PRINT(CAM_DEBUG_SUBTRACE, 531 ("queuing for immediate ccb\n")); 532 start_ccb->ccb_h.ccb_state = PT_CCB_WAITING; 533 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h, 534 periph_links.sle); 535 periph->immediate_priority = CAM_PRIORITY_NONE; 536 splx(s); 537 wakeup(&periph->ccb_list); 538 } else if (bp == NULL) { 539 splx(s); 540 xpt_release_ccb(start_ccb); 541 } else { 542 int oldspl; 543 544 bufq_remove(&softc->buf_queue, bp); 545 546 devstat_start_transaction(&softc->device_stats); 547 548 scsi_send_receive(&start_ccb->csio, 549 /*retries*/4, 550 ptdone, 551 MSG_SIMPLE_Q_TAG, 552 bp->b_flags & B_READ, 553 /*byte2*/0, 554 bp->b_bcount, 555 bp->b_data, 556 /*sense_len*/SSD_FULL_SIZE, 557 /*timeout*/10000); 558 559 start_ccb->ccb_h.ccb_state = PT_CCB_BUFFER_IO; 560 561 /* 562 * Block out any asyncronous callbacks 563 * while we touch the pending ccb list. 564 */ 565 oldspl = splcam(); 566 LIST_INSERT_HEAD(&softc->pending_ccbs, &start_ccb->ccb_h, 567 periph_links.le); 568 splx(oldspl); 569 570 start_ccb->ccb_h.ccb_bp = bp; 571 bp = bufq_first(&softc->buf_queue); 572 splx(s); 573 574 xpt_action(start_ccb); 575 576 if (bp != NULL) { 577 /* Have more work to do, so ensure we stay scheduled */ 578 xpt_schedule(periph, /* XXX priority */1); 579 } 580 } 581} 582 583static void 584ptdone(struct cam_periph *periph, union ccb *done_ccb) 585{ 586 struct pt_softc *softc; 587 struct ccb_scsiio *csio; 588 589 softc = (struct pt_softc *)periph->softc; 590 csio = &done_ccb->csio; 591 switch (csio->ccb_h.ccb_state) { 592 case PT_CCB_BUFFER_IO: 593 case PT_CCB_BUFFER_IO_UA: 594 { 595 struct buf *bp; 596 int oldspl; 597 598 bp = (struct buf *)done_ccb->ccb_h.ccb_bp; 599 if ((done_ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) { 600 int error; 601 int s; 602 int sf; 603 604 if ((csio->ccb_h.ccb_state & PT_CCB_RETRY_UA) != 0) 605 sf = SF_RETRY_UA; 606 else 607 sf = 0; 608 609 if ((error = pterror(done_ccb, 0, sf)) == ERESTART) { 610 /* 611 * A retry was scheuled, so 612 * just return. 613 */ 614 return; 615 } 616 if (error != 0) { 617 struct buf *q_bp; 618 619 s = splbio(); 620 621 if (error == ENXIO) { 622 /* 623 * Catastrophic error. Mark our device 624 * as invalid. 625 */ 626 xpt_print_path(periph->path); 627 printf("Invalidating device\n"); 628 softc->flags |= PT_FLAG_DEVICE_INVALID; 629 } 630 631 /* 632 * return all queued I/O with EIO, so that 633 * the client can retry these I/Os in the 634 * proper order should it attempt to recover. 635 */ 636 while ((q_bp = bufq_first(&softc->buf_queue)) 637 != NULL) { 638 bufq_remove(&softc->buf_queue, q_bp); 639 q_bp->b_resid = q_bp->b_bcount; 640 q_bp->b_error = EIO; 641 q_bp->b_flags |= B_ERROR; 642 biodone(q_bp); 643 } 644 splx(s); 645 bp->b_error = error; 646 bp->b_resid = bp->b_bcount; 647 bp->b_flags |= B_ERROR; 648 } else { 649 bp->b_resid = csio->resid; 650 bp->b_error = 0; 651 if (bp->b_resid != 0) { 652 /* Short transfer ??? */ 653 bp->b_flags |= B_ERROR; 654 } 655 } 656 if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) 657 cam_release_devq(done_ccb->ccb_h.path, 658 /*relsim_flags*/0, 659 /*reduction*/0, 660 /*timeout*/0, 661 /*getcount_only*/0); 662 } else { 663 bp->b_resid = csio->resid; 664 if (bp->b_resid != 0) 665 bp->b_flags |= B_ERROR; 666 } 667 668 /* 669 * Block out any asyncronous callbacks 670 * while we touch the pending ccb list. 671 */ 672 oldspl = splcam(); 673 LIST_REMOVE(&done_ccb->ccb_h, periph_links.le); 674 splx(oldspl); 675 676 devstat_end_transaction(&softc->device_stats, 677 bp->b_bcount - bp->b_resid, 678 done_ccb->csio.tag_action & 0xf, 679 (bp->b_flags & B_READ) ? DEVSTAT_READ 680 : DEVSTAT_WRITE); 681 682 biodone(bp); 683 break; 684 } 685 case PT_CCB_WAITING: 686 /* Caller will release the CCB */ 687 wakeup(&done_ccb->ccb_h.cbfcnp); 688 return; 689 } 690 xpt_release_ccb(done_ccb); 691} 692 693static int 694pterror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags) 695{ 696 struct pt_softc *softc; 697 struct cam_periph *periph; 698 699 periph = xpt_path_periph(ccb->ccb_h.path); 700 softc = (struct pt_softc *)periph->softc; 701 702 return(cam_periph_error(ccb, cam_flags, sense_flags, 703 &softc->saved_ccb)); 704} 705 706void 707scsi_send_receive(struct ccb_scsiio *csio, u_int32_t retries, 708 void (*cbfcnp)(struct cam_periph *, union ccb *), 709 u_int tag_action, int readop, u_int byte2, 710 u_int32_t xfer_len, u_int8_t *data_ptr, u_int8_t sense_len, 711 u_int32_t timeout) 712{ 713 struct scsi_send_receive *scsi_cmd; 714 715 scsi_cmd = (struct scsi_send_receive *)&csio->cdb_io.cdb_bytes; 716 scsi_cmd->opcode = readop ? RECEIVE : SEND; 717 scsi_cmd->byte2 = byte2; 718 scsi_ulto3b(xfer_len, scsi_cmd->xfer_len); 719 scsi_cmd->control = 0; 720 721 cam_fill_csio(csio, 722 retries, 723 cbfcnp, 724 /*flags*/readop ? CAM_DIR_IN : CAM_DIR_OUT, 725 tag_action, 726 data_ptr, 727 xfer_len, 728 sense_len, 729 sizeof(*scsi_cmd), 730 timeout); 731} 732