scsi_pass.c revision 46625
1/* 2 * Copyright (c) 1997, 1998 Justin T. Gibbs. 3 * Copyright (c) 1997, 1998, 1999 Kenneth D. Merry. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions, and the following disclaimer, 11 * without modification, immediately at the beginning of the file. 12 * 2. The name of the author may not be used to endorse or promote products 13 * derived from this software without specific prior written permission. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 19 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * $Id: scsi_pass.c,v 1.7 1999/05/06 20:16:05 ken Exp $ 28 */ 29 30#include <sys/param.h> 31#include <sys/queue.h> 32#include <sys/systm.h> 33#include <sys/kernel.h> 34#include <sys/types.h> 35#include <sys/buf.h> 36#include <sys/dkbad.h> 37#include <sys/disklabel.h> 38#include <sys/diskslice.h> 39#include <sys/malloc.h> 40#include <sys/fcntl.h> 41#include <sys/stat.h> 42#include <sys/conf.h> 43#include <sys/buf.h> 44#include <sys/proc.h> 45#include <sys/errno.h> 46#include <sys/devicestat.h> 47 48#include <cam/cam.h> 49#include <cam/cam_ccb.h> 50#include <cam/cam_extend.h> 51#include <cam/cam_periph.h> 52#include <cam/cam_xpt_periph.h> 53#include <cam/cam_debug.h> 54 55#include <cam/scsi/scsi_all.h> 56#include <cam/scsi/scsi_message.h> 57#include <cam/scsi/scsi_da.h> 58#include <cam/scsi/scsi_pass.h> 59 60typedef enum { 61 PASS_FLAG_OPEN = 0x01, 62 PASS_FLAG_LOCKED = 0x02, 63 PASS_FLAG_INVALID = 0x04 64} pass_flags; 65 66typedef enum { 67 PASS_STATE_NORMAL 68} pass_state; 69 70typedef enum { 71 PASS_CCB_BUFFER_IO, 72 PASS_CCB_WAITING 73} pass_ccb_types; 74 75#define ccb_type ppriv_field0 76#define ccb_bp ppriv_ptr1 77 78struct pass_softc { 79 pass_state state; 80 pass_flags flags; 81 u_int8_t pd_type; 82 struct buf_queue_head buf_queue; 83 union ccb saved_ccb; 84 struct devstat device_stats; 85#ifdef DEVFS 86 void *pass_devfs_token; 87 void *ctl_devfs_token; 88#endif 89}; 90 91#ifndef MIN 92#define MIN(x,y) ((x<y) ? x : y) 93#endif 94 95#define PASS_CDEV_MAJOR 31 96 97static d_open_t passopen; 98static d_close_t passclose; 99static d_ioctl_t passioctl; 100static d_strategy_t passstrategy; 101 102static periph_init_t passinit; 103static periph_ctor_t passregister; 104static periph_oninv_t passoninvalidate; 105static periph_dtor_t passcleanup; 106static periph_start_t passstart; 107static void passasync(void *callback_arg, u_int32_t code, 108 struct cam_path *path, void *arg); 109static void passdone(struct cam_periph *periph, 110 union ccb *done_ccb); 111static int passerror(union ccb *ccb, u_int32_t cam_flags, 112 u_int32_t sense_flags); 113static int passsendccb(struct cam_periph *periph, union ccb *ccb, 114 union ccb *inccb); 115 116static struct periph_driver passdriver = 117{ 118 passinit, "pass", 119 TAILQ_HEAD_INITIALIZER(passdriver.units), /* generation */ 0 120}; 121 122DATA_SET(periphdriver_set, passdriver); 123 124static struct cdevsw pass_cdevsw = 125{ 126 /*d_open*/ passopen, 127 /*d_close*/ passclose, 128 /*d_read*/ physread, 129 /*d_write*/ physwrite, 130 /*d_ioctl*/ passioctl, 131 /*d_stop*/ nostop, 132 /*d_reset*/ noreset, 133 /*d_devtotty*/ nodevtotty, 134 /*d_poll*/ seltrue, 135 /*d_mmap*/ nommap, 136 /*d_strategy*/ passstrategy, 137 /*d_name*/ "pass", 138 /*d_spare*/ NULL, 139 /*d_maj*/ -1, 140 /*d_dump*/ nodump, 141 /*d_psize*/ nopsize, 142 /*d_flags*/ 0, 143 /*d_maxio*/ 0, 144 /*b_maj*/ -1 145}; 146 147static struct extend_array *passperiphs; 148 149static void 150passinit(void) 151{ 152 cam_status status; 153 struct cam_path *path; 154 155 /* 156 * Create our extend array for storing the devices we attach to. 157 */ 158 passperiphs = cam_extend_new(); 159 if (passperiphs == NULL) { 160 printf("passm: Failed to alloc extend array!\n"); 161 return; 162 } 163 164 /* 165 * Install a global async callback. This callback will 166 * receive async callbacks like "new device found". 167 */ 168 status = xpt_create_path(&path, /*periph*/NULL, CAM_XPT_PATH_ID, 169 CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD); 170 171 if (status == CAM_REQ_CMP) { 172 struct ccb_setasync csa; 173 174 xpt_setup_ccb(&csa.ccb_h, path, /*priority*/5); 175 csa.ccb_h.func_code = XPT_SASYNC_CB; 176 csa.event_enable = AC_FOUND_DEVICE; 177 csa.callback = passasync; 178 csa.callback_arg = NULL; 179 xpt_action((union ccb *)&csa); 180 status = csa.ccb_h.status; 181 xpt_free_path(path); 182 } 183 184 if (status != CAM_REQ_CMP) { 185 printf("pass: Failed to attach master async callback " 186 "due to status 0x%x!\n", status); 187 } else { 188 dev_t dev; 189 190 /* If we were successfull, register our devsw */ 191 dev = makedev(PASS_CDEV_MAJOR, 0); 192 cdevsw_add(&dev, &pass_cdevsw, NULL); 193 } 194 195} 196 197static void 198passoninvalidate(struct cam_periph *periph) 199{ 200 int s; 201 struct pass_softc *softc; 202 struct buf *q_bp; 203 struct ccb_setasync csa; 204 205 softc = (struct pass_softc *)periph->softc; 206 207 /* 208 * De-register any async callbacks. 209 */ 210 xpt_setup_ccb(&csa.ccb_h, periph->path, 211 /* priority */ 5); 212 csa.ccb_h.func_code = XPT_SASYNC_CB; 213 csa.event_enable = 0; 214 csa.callback = passasync; 215 csa.callback_arg = periph; 216 xpt_action((union ccb *)&csa); 217 218 softc->flags |= PASS_FLAG_INVALID; 219 220 /* 221 * Although the oninvalidate() routines are always called at 222 * splsoftcam, we need to be at splbio() here to keep the buffer 223 * queue from being modified while we traverse it. 224 */ 225 s = splbio(); 226 227 /* 228 * Return all queued I/O with ENXIO. 229 * XXX Handle any transactions queued to the card 230 * with XPT_ABORT_CCB. 231 */ 232 while ((q_bp = bufq_first(&softc->buf_queue)) != NULL){ 233 bufq_remove(&softc->buf_queue, q_bp); 234 q_bp->b_resid = q_bp->b_bcount; 235 q_bp->b_error = ENXIO; 236 q_bp->b_flags |= B_ERROR; 237 biodone(q_bp); 238 } 239 splx(s); 240 241 if (bootverbose) { 242 xpt_print_path(periph->path); 243 printf("lost device\n"); 244 } 245 246} 247 248static void 249passcleanup(struct cam_periph *periph) 250{ 251 struct pass_softc *softc; 252 253 softc = (struct pass_softc *)periph->softc; 254 255 devstat_remove_entry(&softc->device_stats); 256 257 cam_extend_release(passperiphs, periph->unit_number); 258 259 if (bootverbose) { 260 xpt_print_path(periph->path); 261 printf("removing device entry\n"); 262 } 263 free(softc, M_DEVBUF); 264} 265 266static void 267passasync(void *callback_arg, u_int32_t code, 268 struct cam_path *path, void *arg) 269{ 270 struct cam_periph *periph; 271 272 periph = (struct cam_periph *)callback_arg; 273 274 switch (code) { 275 case AC_FOUND_DEVICE: 276 { 277 struct ccb_getdev *cgd; 278 cam_status status; 279 280 cgd = (struct ccb_getdev *)arg; 281 282 /* 283 * Allocate a peripheral instance for 284 * this device and start the probe 285 * process. 286 */ 287 status = cam_periph_alloc(passregister, passoninvalidate, 288 passcleanup, passstart, "pass", 289 CAM_PERIPH_BIO, cgd->ccb_h.path, 290 passasync, AC_FOUND_DEVICE, cgd); 291 292 if (status != CAM_REQ_CMP 293 && status != CAM_REQ_INPROG) 294 printf("passasync: Unable to attach new device " 295 "due to status 0x%x\n", status); 296 297 break; 298 } 299 case AC_LOST_DEVICE: 300 cam_periph_invalidate(periph); 301 break; 302 case AC_TRANSFER_NEG: 303 case AC_SENT_BDR: 304 case AC_SCSI_AEN: 305 case AC_UNSOL_RESEL: 306 case AC_BUS_RESET: 307 default: 308 break; 309 } 310} 311 312static cam_status 313passregister(struct cam_periph *periph, void *arg) 314{ 315 struct pass_softc *softc; 316 struct ccb_setasync csa; 317 struct ccb_getdev *cgd; 318 319 cgd = (struct ccb_getdev *)arg; 320 if (periph == NULL) { 321 printf("passregister: periph was NULL!!\n"); 322 return(CAM_REQ_CMP_ERR); 323 } 324 325 if (cgd == NULL) { 326 printf("passregister: no getdev CCB, can't register device\n"); 327 return(CAM_REQ_CMP_ERR); 328 } 329 330 softc = (struct pass_softc *)malloc(sizeof(*softc), 331 M_DEVBUF, M_NOWAIT); 332 333 if (softc == NULL) { 334 printf("passregister: Unable to probe new device. " 335 "Unable to allocate softc\n"); 336 return(CAM_REQ_CMP_ERR); 337 } 338 339 bzero(softc, sizeof(*softc)); 340 softc->state = PASS_STATE_NORMAL; 341 softc->pd_type = cgd->pd_type; 342 bufq_init(&softc->buf_queue); 343 344 periph->softc = softc; 345 346 cam_extend_set(passperiphs, periph->unit_number, periph); 347 /* 348 * We pass in 0 for a blocksize, since we don't 349 * know what the blocksize of this device is, if 350 * it even has a blocksize. 351 */ 352 devstat_add_entry(&softc->device_stats, "pass", periph->unit_number, 353 0, DEVSTAT_NO_BLOCKSIZE | DEVSTAT_NO_ORDERED_TAGS, 354 cgd->pd_type | 355 DEVSTAT_TYPE_IF_SCSI | 356 DEVSTAT_TYPE_PASS, 357 DEVSTAT_PRIORITY_PASS); 358 /* 359 * Add an async callback so that we get 360 * notified if this device goes away. 361 */ 362 xpt_setup_ccb(&csa.ccb_h, periph->path, /* priority */ 5); 363 csa.ccb_h.func_code = XPT_SASYNC_CB; 364 csa.event_enable = AC_LOST_DEVICE; 365 csa.callback = passasync; 366 csa.callback_arg = periph; 367 xpt_action((union ccb *)&csa); 368 369 if (bootverbose) 370 xpt_announce_periph(periph, NULL); 371 372 return(CAM_REQ_CMP); 373} 374 375static int 376passopen(dev_t dev, int flags, int fmt, struct proc *p) 377{ 378 struct cam_periph *periph; 379 struct pass_softc *softc; 380 int unit, error; 381 int s; 382 383 error = 0; /* default to no error */ 384 385 /* unit = dkunit(dev); */ 386 /* XXX KDM fix this */ 387 unit = minor(dev) & 0xff; 388 389 periph = cam_extend_get(passperiphs, unit); 390 391 if (periph == NULL) 392 return (ENXIO); 393 394 softc = (struct pass_softc *)periph->softc; 395 396 s = splsoftcam(); 397 if (softc->flags & PASS_FLAG_INVALID) { 398 splx(s); 399 return(ENXIO); 400 } 401 402 /* 403 * Don't allow access when we're running at a high securelvel. 404 */ 405 if (securelevel > 1) { 406 splx(s); 407 return(EPERM); 408 } 409 410 /* 411 * Only allow read-write access. 412 */ 413 if (((flags & FWRITE) == 0) || ((flags & FREAD) == 0)) { 414 splx(s); 415 return(EPERM); 416 } 417 418 /* 419 * We don't allow nonblocking access. 420 */ 421 if ((flags & O_NONBLOCK) != 0) { 422 xpt_print_path(periph->path); 423 printf("can't do nonblocking accesss\n"); 424 splx(s); 425 return(EINVAL); 426 } 427 428 if ((error = cam_periph_lock(periph, PRIBIO | PCATCH)) != 0) { 429 splx(s); 430 return (error); 431 } 432 433 splx(s); 434 435 if ((softc->flags & PASS_FLAG_OPEN) == 0) { 436 if (cam_periph_acquire(periph) != CAM_REQ_CMP) 437 return(ENXIO); 438 softc->flags |= PASS_FLAG_OPEN; 439 } 440 441 cam_periph_unlock(periph); 442 443 return (error); 444} 445 446static int 447passclose(dev_t dev, int flag, int fmt, struct proc *p) 448{ 449 struct cam_periph *periph; 450 struct pass_softc *softc; 451 int unit, error; 452 453 /* unit = dkunit(dev); */ 454 /* XXX KDM fix this */ 455 unit = minor(dev) & 0xff; 456 457 periph = cam_extend_get(passperiphs, unit); 458 if (periph == NULL) 459 return (ENXIO); 460 461 softc = (struct pass_softc *)periph->softc; 462 463 if ((error = cam_periph_lock(periph, PRIBIO)) != 0) 464 return (error); 465 466 softc->flags &= ~PASS_FLAG_OPEN; 467 468 cam_periph_unlock(periph); 469 cam_periph_release(periph); 470 471 return (0); 472} 473 474/* 475 * Actually translate the requested transfer into one the physical driver 476 * can understand. The transfer is described by a buf and will include 477 * only one physical transfer. 478 */ 479static void 480passstrategy(struct buf *bp) 481{ 482 struct cam_periph *periph; 483 struct pass_softc *softc; 484 u_int unit; 485 int s; 486 487 /* 488 * The read/write interface for the passthrough driver doesn't 489 * really work right now. So, we just pass back EINVAL to tell the 490 * user to go away. 491 */ 492 bp->b_error = EINVAL; 493 goto bad; 494 495 /* unit = dkunit(bp->b_dev); */ 496 /* XXX KDM fix this */ 497 unit = minor(bp->b_dev) & 0xff; 498 499 periph = cam_extend_get(passperiphs, unit); 500 if (periph == NULL) { 501 bp->b_error = ENXIO; 502 goto bad; 503 } 504 softc = (struct pass_softc *)periph->softc; 505 506 /* 507 * Odd number of bytes or negative offset 508 */ 509 /* valid request? */ 510 if (bp->b_blkno < 0) { 511 bp->b_error = EINVAL; 512 goto bad; 513 } 514 515 /* 516 * Mask interrupts so that the pack cannot be invalidated until 517 * after we are in the queue. Otherwise, we might not properly 518 * clean up one of the buffers. 519 */ 520 s = splbio(); 521 522 bufq_insert_tail(&softc->buf_queue, bp); 523 524 splx(s); 525 526 /* 527 * Schedule ourselves for performing the work. 528 */ 529 xpt_schedule(periph, /* XXX priority */1); 530 531 return; 532bad: 533 bp->b_flags |= B_ERROR; 534 535 /* 536 * Correctly set the buf to indicate a completed xfer 537 */ 538 bp->b_resid = bp->b_bcount; 539 biodone(bp); 540 return; 541} 542 543static void 544passstart(struct cam_periph *periph, union ccb *start_ccb) 545{ 546 struct pass_softc *softc; 547 int s; 548 549 softc = (struct pass_softc *)periph->softc; 550 551 switch (softc->state) { 552 case PASS_STATE_NORMAL: 553 { 554 struct buf *bp; 555 556 s = splbio(); 557 bp = bufq_first(&softc->buf_queue); 558 if (periph->immediate_priority <= periph->pinfo.priority) { 559 start_ccb->ccb_h.ccb_type = PASS_CCB_WAITING; 560 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h, 561 periph_links.sle); 562 periph->immediate_priority = CAM_PRIORITY_NONE; 563 splx(s); 564 wakeup(&periph->ccb_list); 565 } else if (bp == NULL) { 566 splx(s); 567 xpt_release_ccb(start_ccb); 568 } else { 569 570 bufq_remove(&softc->buf_queue, bp); 571 572 devstat_start_transaction(&softc->device_stats); 573 574 /* 575 * XXX JGibbs - 576 * Interpret the contents of the bp as a CCB 577 * and pass it to a routine shared by our ioctl 578 * code and passtart. 579 * For now, just biodone it with EIO so we don't 580 * hang. 581 */ 582 bp->b_error = EIO; 583 bp->b_flags |= B_ERROR; 584 bp->b_resid = bp->b_bcount; 585 biodone(bp); 586 bp = bufq_first(&softc->buf_queue); 587 splx(s); 588 589 xpt_action(start_ccb); 590 591 } 592 if (bp != NULL) { 593 /* Have more work to do, so ensure we stay scheduled */ 594 xpt_schedule(periph, /* XXX priority */1); 595 } 596 break; 597 } 598 } 599} 600static void 601passdone(struct cam_periph *periph, union ccb *done_ccb) 602{ 603 struct pass_softc *softc; 604 struct ccb_scsiio *csio; 605 606 softc = (struct pass_softc *)periph->softc; 607 csio = &done_ccb->csio; 608 switch (csio->ccb_h.ccb_type) { 609 case PASS_CCB_BUFFER_IO: 610 { 611 struct buf *bp; 612 cam_status status; 613 u_int8_t scsi_status; 614 devstat_trans_flags ds_flags; 615 616 status = done_ccb->ccb_h.status; 617 scsi_status = done_ccb->csio.scsi_status; 618 bp = (struct buf *)done_ccb->ccb_h.ccb_bp; 619 /* XXX handle errors */ 620 if (!(((status & CAM_STATUS_MASK) == CAM_REQ_CMP) 621 && (scsi_status == SCSI_STATUS_OK))) { 622 int error; 623 624 if ((error = passerror(done_ccb, 0, 0)) == ERESTART) { 625 /* 626 * A retry was scheuled, so 627 * just return. 628 */ 629 return; 630 } 631 632 /* 633 * XXX unfreeze the queue after we complete 634 * the abort process 635 */ 636 bp->b_error = error; 637 bp->b_flags |= B_ERROR; 638 } 639 640 if ((done_ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) 641 ds_flags = DEVSTAT_READ; 642 else if ((done_ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_OUT) 643 ds_flags = DEVSTAT_WRITE; 644 else 645 ds_flags = DEVSTAT_NO_DATA; 646 647 devstat_end_transaction(&softc->device_stats, bp->b_bcount, 648 done_ccb->csio.tag_action & 0xf, 649 ds_flags); 650 651 biodone(bp); 652 break; 653 } 654 case PASS_CCB_WAITING: 655 { 656 /* Caller will release the CCB */ 657 wakeup(&done_ccb->ccb_h.cbfcnp); 658 return; 659 } 660 } 661 xpt_release_ccb(done_ccb); 662} 663 664static int 665passioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p) 666{ 667 struct cam_periph *periph; 668 struct pass_softc *softc; 669 u_int8_t unit; 670 int error; 671 672 673 /* unit = dkunit(dev); */ 674 /* XXX KDM fix this */ 675 unit = minor(dev) & 0xff; 676 677 periph = cam_extend_get(passperiphs, unit); 678 679 if (periph == NULL) 680 return(ENXIO); 681 682 softc = (struct pass_softc *)periph->softc; 683 684 error = 0; 685 686 switch (cmd) { 687 688 case CAMIOCOMMAND: 689 { 690 union ccb *inccb; 691 union ccb *ccb; 692 int ccb_malloced; 693 694 inccb = (union ccb *)addr; 695 696 /* 697 * Some CCB types, like scan bus and scan lun can only go 698 * through the transport layer device. 699 */ 700 if (inccb->ccb_h.func_code & XPT_FC_XPT_ONLY) { 701 xpt_print_path(periph->path); 702 printf("CCB function code %#x is restricted to the " 703 "XPT device\n", inccb->ccb_h.func_code); 704 error = ENODEV; 705 break; 706 } 707 708 /* 709 * Non-immediate CCBs need a CCB from the per-device pool 710 * of CCBs, which is scheduled by the transport layer. 711 * Immediate CCBs and user-supplied CCBs should just be 712 * malloced. 713 */ 714 if ((inccb->ccb_h.func_code & XPT_FC_QUEUED) 715 && ((inccb->ccb_h.func_code & XPT_FC_USER_CCB) == 0)) { 716 ccb = cam_periph_getccb(periph, 717 inccb->ccb_h.pinfo.priority); 718 ccb_malloced = 0; 719 } else { 720 ccb = xpt_alloc_ccb(); 721 722 if (ccb != NULL) 723 xpt_setup_ccb(&ccb->ccb_h, periph->path, 724 inccb->ccb_h.pinfo.priority); 725 ccb_malloced = 1; 726 } 727 728 if (ccb == NULL) { 729 xpt_print_path(periph->path); 730 printf("unable to allocate CCB\n"); 731 error = ENOMEM; 732 break; 733 } 734 735 error = passsendccb(periph, ccb, inccb); 736 737 if (ccb_malloced) 738 xpt_free_ccb(ccb); 739 else 740 xpt_release_ccb(ccb); 741 742 break; 743 } 744 default: 745 error = cam_periph_ioctl(periph, cmd, addr, passerror); 746 break; 747 } 748 749 return(error); 750} 751 752/* 753 * Generally, "ccb" should be the CCB supplied by the kernel. "inccb" 754 * should be the CCB that is copied in from the user. 755 */ 756static int 757passsendccb(struct cam_periph *periph, union ccb *ccb, union ccb *inccb) 758{ 759 struct pass_softc *softc; 760 struct cam_periph_map_info mapinfo; 761 int error, need_unmap; 762 763 softc = (struct pass_softc *)periph->softc; 764 765 need_unmap = 0; 766 767 /* 768 * There are some fields in the CCB header that need to be 769 * preserved, the rest we get from the user. 770 */ 771 xpt_merge_ccb(ccb, inccb); 772 773 /* 774 * There's no way for the user to have a completion 775 * function, so we put our own completion function in here. 776 */ 777 ccb->ccb_h.cbfcnp = passdone; 778 779 /* 780 * We only attempt to map the user memory into kernel space 781 * if they haven't passed in a physical memory pointer, 782 * and if there is actually an I/O operation to perform. 783 * Right now cam_periph_mapmem() only supports SCSI and device 784 * match CCBs. For the SCSI CCBs, we only pass the CCB in if 785 * there's actually data to map. cam_periph_mapmem() will do the 786 * right thing, even if there isn't data to map, but since CCBs 787 * without data are a reasonably common occurance (e.g. test unit 788 * ready), it will save a few cycles if we check for it here. 789 */ 790 if (((ccb->ccb_h.flags & CAM_DATA_PHYS) == 0) 791 && (((ccb->ccb_h.func_code == XPT_SCSI_IO) 792 && ((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE)) 793 || (ccb->ccb_h.func_code == XPT_DEV_MATCH))) { 794 795 bzero(&mapinfo, sizeof(mapinfo)); 796 797 error = cam_periph_mapmem(ccb, &mapinfo); 798 799 /* 800 * cam_periph_mapmem returned an error, we can't continue. 801 * Return the error to the user. 802 */ 803 if (error) 804 return(error); 805 806 /* 807 * We successfully mapped the memory in, so we need to 808 * unmap it when the transaction is done. 809 */ 810 need_unmap = 1; 811 } 812 813 /* 814 * If the user wants us to perform any error recovery, then honor 815 * that request. Otherwise, it's up to the user to perform any 816 * error recovery. 817 */ 818 error = cam_periph_runccb(ccb, 819 (ccb->ccb_h.flags & CAM_PASS_ERR_RECOVER) ? 820 passerror : NULL, 821 /* cam_flags */ 0, 822 /* sense_flags */SF_RETRY_UA, 823 &softc->device_stats); 824 825 if (need_unmap != 0) 826 cam_periph_unmapmem(ccb, &mapinfo); 827 828 ccb->ccb_h.cbfcnp = NULL; 829 ccb->ccb_h.periph_priv = inccb->ccb_h.periph_priv; 830 bcopy(ccb, inccb, sizeof(union ccb)); 831 832 return(error); 833} 834 835static int 836passerror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags) 837{ 838 struct cam_periph *periph; 839 struct pass_softc *softc; 840 841 periph = xpt_path_periph(ccb->ccb_h.path); 842 softc = (struct pass_softc *)periph->softc; 843 844 return(cam_periph_error(ccb, cam_flags, sense_flags, 845 &softc->saved_ccb)); 846} 847