1 /* 2 * Common functions for CAM "type" (peripheral) drivers. 3 * 4 * Copyright (c) 1997, 1998 Justin T. Gibbs. 5 * Copyright (c) 1997, 1998 Kenneth D. Merry. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions, and the following disclaimer, 13 * without modification, immediately at the beginning of the file. 14 * 2. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $Id: cam_periph.c,v 1.5 1998/10/15 17:46:18 ken Exp $ 30 */ 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/types.h> 35 #include <sys/malloc.h> 36 #include <sys/kernel.h> 37 #include <sys/buf.h> 38 #include <sys/proc.h> 39 #include <sys/devicestat.h> 40 #include <vm/vm.h> 41 #include <vm/vm_extern.h> 42 43 #include <cam/cam.h> 44 #include <cam/cam_conf.h> 45 #include <cam/cam_ccb.h> 46 #include <cam/cam_xpt_periph.h> 47 #include <cam/cam_periph.h> 48 #include <cam/cam_debug.h> 49 50 #include <cam/scsi/scsi_all.h> 51 #include <cam/scsi/scsi_message.h> 52 #include <cam/scsi/scsi_da.h> 53 #include <cam/scsi/scsi_pass.h> 54 55 static u_int camperiphnextunit(struct periph_driver *p_drv, 56 u_int newunit, int wired); 57 static u_int camperiphunit(struct periph_driver *p_drv, 58 path_id_t path_id_t, 59 target_id_t target, lun_id_t lun); 60 static void camperiphdone(struct cam_periph *periph, 61 union ccb *done_ccb); 62 static void camperiphfree(struct cam_periph *periph); 63 64 cam_status 65 cam_periph_alloc(periph_ctor_t *periph_ctor, 66 periph_oninv_t *periph_oninvalidate, 67 periph_dtor_t *periph_dtor, periph_start_t *periph_start, 68 char *name, cam_periph_type type, struct cam_path *path, 69 ac_callback_t *ac_callback, ac_code code, void *arg) 70 { 71 struct periph_driver **p_drv; 72 struct cam_periph *periph; 73 struct cam_periph *cur_periph; 74 path_id_t path_id; 75 target_id_t target_id; 76 lun_id_t lun_id; 77 cam_status status; 78 u_int init_level; 79 int s; 80 81 init_level = 0; 82 /* 83 * Handle Hot-Plug scenarios. If there is already a peripheral 84 * of our type assigned to this path, we are likely waiting for 85 * final close on an old, invalidated, peripheral. If this is 86 * the case, queue up a deferred call to the peripheral's async 87 * handler. If it looks like a mistaken re-alloation, complain. 88 */ 89 if ((periph = cam_periph_find(path, name)) != NULL) { 90 91 if ((periph->flags & CAM_PERIPH_INVALID) != 0 92 && (periph->flags & CAM_PERIPH_NEW_DEV_FOUND) == 0) { 93 periph->flags |= CAM_PERIPH_NEW_DEV_FOUND; 94 periph->deferred_callback = ac_callback; 95 periph->deferred_ac = code; 96 return (CAM_REQ_INPROG); 97 } else { 98 printf("cam_periph_alloc: attempt to re-allocate " 99 "valid device %s%d rejected\n", 100 periph->periph_name, periph->unit_number); 101 } 102 return (CAM_REQ_INVALID); 103 } 104 105 periph = (struct cam_periph *)malloc(sizeof(*periph), M_DEVBUF, 106 M_NOWAIT); 107 108 if (periph == NULL) 109 return (CAM_RESRC_UNAVAIL); 110 111 init_level++; 112 113 for (p_drv = (struct periph_driver **)periphdriver_set.ls_items; 114 *p_drv != NULL; p_drv++) { 115 if (strcmp((*p_drv)->driver_name, name) == 0) 116 break; 117 } 118 119 path_id = xpt_path_path_id(path); 120 target_id = xpt_path_target_id(path); 121 lun_id = xpt_path_lun_id(path); 122 bzero(periph, sizeof(*periph)); 123 cam_init_pinfo(&periph->pinfo); 124 periph->periph_start = periph_start; 125 periph->periph_dtor = periph_dtor; 126 periph->periph_oninval = periph_oninvalidate; 127 periph->type = type; 128 periph->periph_name = name; 129 periph->unit_number = camperiphunit(*p_drv, path_id, target_id, lun_id); 130 periph->immediate_priority = CAM_PRIORITY_NONE; 131 periph->refcount = 0; 132 SLIST_INIT(&periph->ccb_list); 133 status = xpt_create_path(&path, periph, path_id, target_id, lun_id); 134 if (status != CAM_REQ_CMP) 135 goto failure; 136 137 periph->path = path; 138 init_level++; 139 140 status = xpt_add_periph(periph); 141 142 if (status != CAM_REQ_CMP) 143 goto failure; 144 145 s = splsoftcam(); 146 cur_periph = TAILQ_FIRST(&(*p_drv)->units); 147 while (cur_periph != NULL 148 && cur_periph->unit_number < periph->unit_number) 149 cur_periph = TAILQ_NEXT(cur_periph, unit_links); 150 151 if (cur_periph != NULL) 152 TAILQ_INSERT_BEFORE(cur_periph, periph, unit_links); 153 else { 154 TAILQ_INSERT_TAIL(&(*p_drv)->units, periph, unit_links); 155 (*p_drv)->generation++; 156 } 157 158 splx(s); 159 160 init_level++; 161 162 status = periph_ctor(periph, arg); 163 164 if (status == CAM_REQ_CMP) 165 init_level++; 166 167 failure: 168 switch (init_level) { 169 case 4: 170 /* Initialized successfully */ 171 break; 172 case 3: 173 s = splsoftcam(); 174 TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links); 175 splx(s); 176 xpt_remove_periph(periph); 177 case 2: 178 xpt_free_path(periph->path); 179 case 1: 180 free(periph, M_DEVBUF); 181 case 0: 182 /* No cleanup to perform. */ 183 break; 184 default: 185 panic("cam_periph_alloc: Unkown init level"); 186 } 187 return(status); 188 } 189 190 /* 191 * Find a peripheral structure with the specified path, target, lun, 192 * and (optionally) type. If the name is NULL, this function will return 193 * the first peripheral driver that matches the specified path. 194 */ 195 struct cam_periph * 196 cam_periph_find(struct cam_path *path, char *name) 197 { 198 struct periph_driver **p_drv; 199 struct cam_periph *periph; 200 int s; 201 202 for (p_drv = (struct periph_driver **)periphdriver_set.ls_items; 203 *p_drv != NULL; p_drv++) { 204 205 if (name != NULL && (strcmp((*p_drv)->driver_name, name) != 0)) 206 continue; 207 208 s = splsoftcam(); 209 for (periph = TAILQ_FIRST(&(*p_drv)->units); periph != NULL; 210 periph = TAILQ_NEXT(periph, unit_links)) { 211 if (xpt_path_comp(periph->path, path) == 0) { 212 splx(s); 213 return(periph); 214 } 215 } 216 splx(s); 217 if (name != NULL) 218 return(NULL); 219 } 220 return(NULL); 221 } 222 223 cam_status 224 cam_periph_acquire(struct cam_periph *periph) 225 { 226 int s; 227 228 if (periph == NULL) 229 return(CAM_REQ_CMP_ERR); 230 231 s = splsoftcam(); 232 periph->refcount++; 233 splx(s); 234 235 return(CAM_REQ_CMP); 236 } 237 238 void 239 cam_periph_release(struct cam_periph *periph) 240 { 241 int s; 242 243 if (periph == NULL) 244 return; 245 246 s = splsoftcam(); 247 if ((--periph->refcount == 0) 248 && (periph->flags & CAM_PERIPH_INVALID)) { 249 camperiphfree(periph); 250 } 251 splx(s); 252 253 } 254 255 /* 256 * Look for the next unit number that is not currently in use for this 257 * peripheral type starting at "newunit". Also exclude unit numbers that 258 * are reserved by for future "hardwiring" unless we already know that this 259 * is a potential wired device. Only assume that the device is "wired" the 260 * first time through the loop since after that we'll be looking at unit 261 * numbers that did not match a wiring entry. 262 */ 263 static u_int 264 camperiphnextunit(struct periph_driver *p_drv, u_int newunit, int wired) 265 { 266 struct cam_periph *periph; 267 struct cam_periph_config *periph_conf; 268 char *periph_name; 269 int s; 270 271 s = splsoftcam(); 272 periph_name = p_drv->driver_name; 273 for (;;newunit++) { 274 275 for (periph = TAILQ_FIRST(&p_drv->units); 276 periph != NULL && periph->unit_number != newunit; 277 periph = TAILQ_NEXT(periph, unit_links)) 278 ; 279 280 if (periph != NULL && periph->unit_number == newunit) { 281 if (wired != 0) { 282 xpt_print_path(periph->path); 283 printf("Duplicate Wired Device entry!\n"); 284 xpt_print_path(periph->path); 285 printf("Second device will not be wired\n"); 286 wired = 0; 287 } 288 continue; 289 } 290 291 for (periph_conf = cam_pinit; 292 wired == 0 && periph_conf->periph_name != NULL; 293 periph_conf++) { 294 295 /* 296 * Don't match entries like "da 4" as a wired down 297 * device, but do match entries like "da 4 target 5" 298 * or even "da 4 scbus 1". 299 */ 300 if (IS_SPECIFIED(periph_conf->periph_unit) 301 && (!strcmp(periph_name, periph_conf->periph_name)) 302 && (IS_SPECIFIED(periph_conf->target) 303 || IS_SPECIFIED(periph_conf->pathid)) 304 && (newunit == periph_conf->periph_unit)) 305 break; 306 } 307 308 if (wired != 0 || periph_conf->periph_name == NULL) 309 break; 310 } 311 splx(s); 312 return (newunit); 313 } 314 315 static u_int 316 camperiphunit(struct periph_driver *p_drv, path_id_t pathid, 317 target_id_t target, lun_id_t lun) 318 { 319 struct cam_periph_config *periph_conf; 320 u_int unit; 321 int hit; 322 323 unit = 0; 324 hit = 0; 325 326 for (periph_conf = cam_pinit; 327 periph_conf->periph_name != NULL; 328 periph_conf++, hit = 0) { 329 330 if (!strcmp(p_drv->driver_name, periph_conf->periph_name) 331 && IS_SPECIFIED(periph_conf->periph_unit)) { 332 333 if (IS_SPECIFIED(periph_conf->pathid)) { 334 335 if (pathid != periph_conf->pathid) 336 continue; 337 hit++; 338 } 339 340 if (IS_SPECIFIED(periph_conf->target)) { 341 342 if (target != periph_conf->target) 343 continue; 344 hit++; 345 } 346 347 if (IS_SPECIFIED(periph_conf->lun)) { 348 349 if (lun != periph_conf->lun) 350 continue; 351 hit++; 352 } 353 354 if (hit != 0) { 355 unit = periph_conf->periph_unit; 356 break; 357 } 358 } 359 } 360 361 /* 362 * Either start from 0 looking for the next unit or from 363 * the unit number given in the periph_conf. This way, 364 * if we have wildcard matches, we don't return the same 365 * unit number twice. 366 */ 367 unit = camperiphnextunit(p_drv, unit, /*wired*/hit); 368 369 return (unit); 370 } 371 372 void 373 cam_periph_invalidate(struct cam_periph *periph) 374 { 375 int s; 376 377 s = splsoftcam(); 378 /* 379 * We only call this routine the first time a peripheral is 380 * invalidated. The oninvalidate() routine is always called at 381 * splsoftcam(). 382 */ 383 if (((periph->flags & CAM_PERIPH_INVALID) == 0) 384 && (periph->periph_oninval != NULL)) 385 periph->periph_oninval(periph); 386 387 periph->flags |= CAM_PERIPH_INVALID; 388 periph->flags &= ~CAM_PERIPH_NEW_DEV_FOUND; 389 390 if (periph->refcount == 0) 391 camperiphfree(periph); 392 else if (periph->refcount < 0) 393 printf("cam_invalidate_periph: refcount < 0!!\n"); 394 splx(s); 395 } 396 397 static void 398 camperiphfree(struct cam_periph *periph) 399 { 400 int s; 401 struct periph_driver **p_drv; 402 403 for (p_drv = (struct periph_driver **)periphdriver_set.ls_items; 404 *p_drv != NULL; p_drv++) { 405 if (strcmp((*p_drv)->driver_name, periph->periph_name) == 0) 406 break; 407 } 408 409 if (periph->periph_dtor != NULL) 410 periph->periph_dtor(periph); 411 412 s = splsoftcam(); 413 TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links); 414 (*p_drv)->generation++; 415 splx(s); 416 417 xpt_remove_periph(periph); 418 419 if (periph->flags & CAM_PERIPH_NEW_DEV_FOUND) { 420 union ccb ccb; 421 void *arg; 422 423 switch (periph->deferred_ac) { 424 case AC_FOUND_DEVICE: 425 ccb.ccb_h.func_code = XPT_GDEV_TYPE; 426 xpt_setup_ccb(&ccb.ccb_h, periph->path, /*priority*/ 1); 427 xpt_action(&ccb); 428 arg = &ccb; 429 break; 430 case AC_PATH_REGISTERED: 431 ccb.ccb_h.func_code = XPT_PATH_INQ; 432 xpt_setup_ccb(&ccb.ccb_h, periph->path, /*priority*/ 1); 433 xpt_action(&ccb); 434 arg = &ccb; 435 break; 436 default: 437 arg = NULL; 438 break; 439 } 440 periph->deferred_callback(NULL, periph->deferred_ac, 441 periph->path, arg); 442 } 443 xpt_free_path(periph->path); 444 free(periph, M_DEVBUF); 445 } 446 447 /* 448 * Wait interruptibly for an exclusive lock. 449 */ 450 int 451 cam_periph_lock(struct cam_periph *periph, int priority) 452 { 453 int error; 454 455 while ((periph->flags & CAM_PERIPH_LOCKED) != 0) { 456 periph->flags |= CAM_PERIPH_LOCK_WANTED; 457 if ((error = tsleep(periph, priority, "caplck", 0)) != 0) 458 return error; 459 } 460 461 if (cam_periph_acquire(periph) != CAM_REQ_CMP) 462 return(ENXIO); 463 464 periph->flags |= CAM_PERIPH_LOCKED; 465 return 0; 466 } 467 468 /* 469 * Unlock and wake up any waiters. 470 */ 471 void 472 cam_periph_unlock(struct cam_periph *periph) 473 { 474 periph->flags &= ~CAM_PERIPH_LOCKED; 475 if ((periph->flags & CAM_PERIPH_LOCK_WANTED) != 0) { 476 periph->flags &= ~CAM_PERIPH_LOCK_WANTED; 477 wakeup(periph); 478 } 479 480 cam_periph_release(periph); 481 } 482 483 /* 484 * Map user virtual pointers into kernel virtual address space, so we can 485 * access the memory. This won't work on physical pointers, for now it's 486 * up to the caller to check for that. (XXX KDM -- should we do that here 487 * instead?) This also only works for up to MAXPHYS memory. Since we use 488 * buffers to map stuff in and out, we're limited to the buffer size. 489 */ 490 int 491 cam_periph_mapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo) 492 { 493 int flags, numbufs, i; 494 u_int8_t **data_ptrs[CAM_PERIPH_MAXMAPS]; 495 u_int32_t lengths[CAM_PERIPH_MAXMAPS]; 496 u_int32_t dirs[CAM_PERIPH_MAXMAPS]; 497 498 switch(ccb->ccb_h.func_code) { 499 case XPT_DEV_MATCH: 500 if (ccb->cdm.pattern_buf_len > MAXPHYS) { 501 printf("cam_periph_mapmem: attempt to map %u bytes, " 502 "which is greater than MAXPHYS(%d)\n", 503 ccb->cdm.pattern_buf_len, MAXPHYS); 504 return(E2BIG); 505 } else if (ccb->cdm.match_buf_len > MAXPHYS) { 506 printf("cam_periph_mapmem: attempt to map %u bytes, " 507 "which is greater than MAXPHYS(%d)\n", 508 ccb->cdm.match_buf_len, MAXPHYS); 509 return(E2BIG); 510 } 511 if (ccb->cdm.match_buf_len == 0) { 512 printf("cam_periph_mapmem: invalid match buffer " 513 "length 0\n"); 514 return(EINVAL); 515 } 516 if (ccb->cdm.pattern_buf_len > 0) { 517 data_ptrs[0] = (u_int8_t **)&ccb->cdm.patterns; 518 lengths[0] = ccb->cdm.pattern_buf_len; 519 dirs[0] = CAM_DIR_OUT; 520 data_ptrs[1] = (u_int8_t **)&ccb->cdm.matches; 521 lengths[1] = ccb->cdm.match_buf_len; 522 dirs[1] = CAM_DIR_IN; 523 numbufs = 2; 524 } else { 525 data_ptrs[0] = (u_int8_t **)&ccb->cdm.matches; 526 lengths[0] = ccb->cdm.match_buf_len; 527 dirs[0] = CAM_DIR_IN; 528 numbufs = 1; 529 } 530 break; 531 case XPT_SCSI_IO: 532 if (ccb->csio.dxfer_len > MAXPHYS) { 533 printf("cam_periph_mapmem: attempt to map %u bytes, " 534 "which is greater than MAXPHYS(%d)\n", 535 ccb->csio.dxfer_len, MAXPHYS); 536 return(E2BIG); 537 } 538 539 if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_NONE) 540 return(0); 541 542 data_ptrs[0] = &ccb->csio.data_ptr; 543 lengths[0] = ccb->csio.dxfer_len;; 544 dirs[0] = ccb->ccb_h.flags & CAM_DIR_MASK; 545 numbufs = 1; 546 break; 547 default: 548 return(EINVAL); 549 break; /* NOTREACHED */ 550 } 551 552 /* this keeps the current process from getting swapped */ 553 /* 554 * XXX KDM should I use P_NOSWAP instead? 555 */ 556 curproc->p_flag |= P_PHYSIO; 557 558 for (i = 0; i < numbufs; i++) { 559 flags = 0; 560 561 if (dirs[i] & CAM_DIR_IN) { 562 flags = B_READ; 563 if (useracc(*data_ptrs[i], lengths[i], B_READ) == 0){ 564 printf("cam_periph_mapmem: error, " 565 "address %p, length %lu isn't " 566 "user accessible for READ\n", 567 (void *)*data_ptrs[i], 568 (u_long)lengths[i]); 569 /* 570 * If we've already mapped one or more 571 * buffers for this CCB, unmap it (them). 572 */ 573 if (i > 0) 574 cam_periph_unmapmem(ccb, mapinfo); 575 else 576 curproc->p_flag &= ~P_PHYSIO; 577 578 return(EACCES); 579 } 580 } 581 582 /* 583 * XXX this check is really bogus, since B_WRITE currently 584 * is all 0's, and so it is "set" all the time. 585 */ 586 if (dirs[i] & CAM_DIR_OUT) { 587 flags |= B_WRITE; 588 if (useracc(*data_ptrs[i], lengths[i], B_WRITE) == 0){ 589 printf("cam_periph_mapmem: error, " 590 "address %p, length %lu isn't " 591 "user accessible for WRITE\n", 592 (void *)*data_ptrs[i], 593 (u_long)lengths[i]); 594 /* 595 * If we've already mapped one or more 596 * buffers for this CCB, unmap it (them). 597 */ 598 if (i > 0) 599 cam_periph_unmapmem(ccb, mapinfo); 600 else 601 curproc->p_flag &= ~P_PHYSIO; 602 603 return(EACCES); 604 } 605 } 606 607 /* 608 * Get the buffer. 609 */ 610 mapinfo->bp[i] = getpbuf(); 611 612 /* save the buffer's data address */ 613 mapinfo->bp[i]->b_saveaddr = mapinfo->bp[i]->b_data; 614 615 /* put our pointer in the data slot */ 616 mapinfo->bp[i]->b_data = *data_ptrs[i]; 617 618 /* set the transfer length, we know it's < 64K */ 619 mapinfo->bp[i]->b_bufsize = lengths[i]; 620 621 /* set the flags */ 622 mapinfo->bp[i]->b_flags = flags | B_PHYS | B_BUSY; 623 624 /* map the buffer into kernel memory */ 625 vmapbuf(mapinfo->bp[i]); 626 627 /* set our pointer to the new mapped area */ 628 *data_ptrs[i] = mapinfo->bp[i]->b_data; 629 630 mapinfo->num_bufs_used++; 631 } 632 633 return(0); 634 } 635 636 /* 637 * Unmap memory segments mapped into kernel virtual address space by 638 * cam_periph_mapmem(). 639 */ 640 void 641 cam_periph_unmapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo) 642 { 643 int numbufs, i; 644 u_int8_t **data_ptrs[CAM_PERIPH_MAXMAPS]; 645 646 if (mapinfo->num_bufs_used <= 0) { 647 /* allow ourselves to be swapped once again */ 648 curproc->p_flag &= ~P_PHYSIO; 649 return; 650 } 651 652 switch (ccb->ccb_h.func_code) { 653 case XPT_DEV_MATCH: 654 numbufs = min(mapinfo->num_bufs_used, 2); 655 656 if (numbufs == 1) { 657 data_ptrs[0] = (u_int8_t **)&ccb->cdm.matches; 658 } else { 659 data_ptrs[0] = (u_int8_t **)&ccb->cdm.patterns; 660 data_ptrs[1] = (u_int8_t **)&ccb->cdm.matches; 661 } 662 break; 663 case XPT_SCSI_IO: 664 data_ptrs[0] = &ccb->csio.data_ptr; 665 numbufs = min(mapinfo->num_bufs_used, 1); 666 break; 667 default: 668 /* allow ourselves to be swapped once again */ 669 curproc->p_flag &= ~P_PHYSIO; 670 return; 671 break; /* NOTREACHED */ 672 } 673 674 for (i = 0; i < numbufs; i++) { 675 /* Set the user's pointer back to the original value */ 676 *data_ptrs[i] = mapinfo->bp[i]->b_saveaddr; 677 678 /* unmap the buffer */ 679 vunmapbuf(mapinfo->bp[i]); 680 681 /* clear the flags we set above */ 682 mapinfo->bp[i]->b_flags &= ~(B_PHYS|B_BUSY); 683 684 /* release the buffer */ 685 relpbuf(mapinfo->bp[i]); 686 } 687 688 /* allow ourselves to be swapped once again */ 689 curproc->p_flag &= ~P_PHYSIO; 690 } 691 692 union ccb * 693 cam_periph_getccb(struct cam_periph *periph, u_int32_t priority) 694 { 695 struct ccb_hdr *ccb_h; 696 int s; 697 698 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("entering cdgetccb\n")); 699 700 s = splsoftcam(); 701 702 while (periph->ccb_list.slh_first == NULL) { 703 if (periph->immediate_priority > priority) 704 periph->immediate_priority = priority; 705 xpt_schedule(periph, priority); 706 if ((periph->ccb_list.slh_first != NULL) 707 && (periph->ccb_list.slh_first->pinfo.priority == priority)) 708 break; 709 tsleep(&periph->ccb_list, PRIBIO, "cgticb", 0); 710 } 711 712 ccb_h = periph->ccb_list.slh_first; 713 SLIST_REMOVE_HEAD(&periph->ccb_list, periph_links.sle); 714 splx(s); 715 return ((union ccb *)ccb_h); 716 } 717 718 void 719 cam_periph_ccbwait(union ccb *ccb) 720 { 721 int s; 722 723 s = splsoftcam(); 724 if ((ccb->ccb_h.pinfo.index != CAM_UNQUEUED_INDEX) 725 || ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_INPROG)) 726 tsleep(&ccb->ccb_h.cbfcnp, PRIBIO, "cbwait", 0); 727 728 splx(s); 729 } 730 731 int 732 cam_periph_ioctl(struct cam_periph *periph, int cmd, caddr_t addr, 733 int (*error_routine)(union ccb *ccb, 734 cam_flags camflags, 735 u_int32_t sense_flags)) 736 { 737 union ccb *ccb; 738 int error; 739 int found; 740 741 error = found = 0; 742 743 switch(cmd){ 744 case CAMGETPASSTHRU: 745 ccb = cam_periph_getccb(periph, /* priority */ 1); 746 xpt_setup_ccb(&ccb->ccb_h, 747 ccb->ccb_h.path, 748 /*priority*/1); 749 ccb->ccb_h.func_code = XPT_GDEVLIST; 750 751 /* 752 * Basically, the point of this is that we go through 753 * getting the list of devices, until we find a passthrough 754 * device. In the current version of the CAM code, the 755 * only way to determine what type of device we're dealing 756 * with is by its name. 757 */ 758 while (found == 0) { 759 ccb->cgdl.index = 0; 760 ccb->cgdl.status = CAM_GDEVLIST_MORE_DEVS; 761 while (ccb->cgdl.status == CAM_GDEVLIST_MORE_DEVS) { 762 763 /* we want the next device in the list */ 764 xpt_action(ccb); 765 if (strncmp(ccb->cgdl.periph_name, 766 "pass", 4) == 0){ 767 found = 1; 768 break; 769 } 770 } 771 if ((ccb->cgdl.status == CAM_GDEVLIST_LAST_DEVICE) && 772 (found == 0)) { 773 ccb->cgdl.periph_name[0] = '\0'; 774 ccb->cgdl.unit_number = 0; 775 break; 776 } 777 } 778 779 /* copy the result back out */ 780 bcopy(ccb, addr, sizeof(union ccb)); 781 782 /* and release the ccb */ 783 xpt_release_ccb(ccb); 784 785 break; 786 default: 787 error = ENOTTY; 788 break; 789 } 790 return(error); 791 } 792 793 int 794 cam_periph_runccb(union ccb *ccb, 795 int (*error_routine)(union ccb *ccb, 796 cam_flags camflags, 797 u_int32_t sense_flags), 798 cam_flags camflags, u_int32_t sense_flags, 799 struct devstat *ds) 800 { 801 int error; 802 803 error = 0; 804 805 /* 806 * If the user has supplied a stats structure, and if we understand 807 * this particular type of ccb, record the transaction start. 808 */ 809 if ((ds != NULL) && (ccb->ccb_h.func_code == XPT_SCSI_IO)) 810 devstat_start_transaction(ds); 811 812 xpt_action(ccb); 813 814 do { 815 cam_periph_ccbwait(ccb); 816 if ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP) 817 error = 0; 818 else if (error_routine != NULL) 819 error = (*error_routine)(ccb, camflags, sense_flags); 820 else 821 error = 0; 822 823 } while (error == ERESTART); 824 825 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) 826 cam_release_devq(ccb->ccb_h.path, 827 /* relsim_flags */0, 828 /* openings */0, 829 /* timeout */0, 830 /* getcount_only */ FALSE); 831 832 if ((ds != NULL) && (ccb->ccb_h.func_code == XPT_SCSI_IO)) 833 devstat_end_transaction(ds, 834 ccb->csio.dxfer_len, 835 ccb->csio.tag_action & 0xf, 836 ((ccb->ccb_h.flags & CAM_DIR_MASK) == 837 CAM_DIR_NONE) ? DEVSTAT_NO_DATA : 838 (ccb->ccb_h.flags & CAM_DIR_OUT) ? 839 DEVSTAT_WRITE : 840 DEVSTAT_READ); 841 842 return(error); 843 } 844 845 u_int32_t 846 cam_release_devq(struct cam_path *path, u_int32_t relsim_flags, 847 u_int32_t openings, u_int32_t timeout, 848 int getcount_only) 849 { 850 struct ccb_relsim crs; 851 852 xpt_setup_ccb(&crs.ccb_h, path, 853 /*priority*/1); 854 crs.ccb_h.func_code = XPT_REL_SIMQ; 855 crs.ccb_h.flags = getcount_only ? CAM_DEV_QFREEZE : 0; 856 crs.release_flags = relsim_flags; 857 crs.openings = openings; 858 crs.release_timeout = timeout; 859 xpt_action((union ccb *)&crs); 860 return (crs.qfrozen_cnt); 861 } 862 863 #define saved_ccb_ptr ppriv_ptr0 864 static void 865 camperiphdone(struct cam_periph *periph, union ccb *done_ccb) 866 { 867 cam_status status; 868 int frozen; 869 int sense; 870 struct scsi_start_stop_unit *scsi_cmd; 871 u_int32_t relsim_flags, timeout; 872 u_int32_t qfrozen_cnt; 873 874 status = done_ccb->ccb_h.status; 875 frozen = (status & CAM_DEV_QFRZN) != 0; 876 sense = (status & CAM_AUTOSNS_VALID) != 0; 877 status &= CAM_STATUS_MASK; 878 879 timeout = 0; 880 relsim_flags = 0; 881 882 /* 883 * Unfreeze the queue once if it is already frozen.. 884 */ 885 if (frozen != 0) { 886 qfrozen_cnt = cam_release_devq(done_ccb->ccb_h.path, 887 /*relsim_flags*/0, 888 /*openings*/0, 889 /*timeout*/0, 890 /*getcount_only*/0); 891 } 892 893 switch (status) { 894 895 case CAM_REQ_CMP: 896 897 /* 898 * If we have successfully taken a device from the not 899 * ready to ready state, re-scan the device and re-get the 900 * inquiry information. Many devices (mostly disks) don't 901 * properly report their inquiry information unless they 902 * are spun up. 903 */ 904 if (done_ccb->ccb_h.func_code == XPT_SCSI_IO) { 905 scsi_cmd = (struct scsi_start_stop_unit *) 906 &done_ccb->csio.cdb_io.cdb_bytes; 907 908 if (scsi_cmd->opcode == START_STOP_UNIT) 909 xpt_async(AC_INQ_CHANGED, 910 done_ccb->ccb_h.path, NULL); 911 } 912 bcopy(done_ccb->ccb_h.saved_ccb_ptr, done_ccb, 913 sizeof(union ccb)); 914 915 periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG; 916 917 xpt_action(done_ccb); 918 919 break; 920 case CAM_SCSI_STATUS_ERROR: 921 scsi_cmd = (struct scsi_start_stop_unit *) 922 &done_ccb->csio.cdb_io.cdb_bytes; 923 if (sense != 0) { 924 struct scsi_sense_data *sense; 925 int error_code, sense_key, asc, ascq; 926 927 sense = &done_ccb->csio.sense_data; 928 scsi_extract_sense(sense, &error_code, 929 &sense_key, &asc, &ascq); 930 931 /* 932 * If the error is "invalid field in CDB", 933 * and the load/eject flag is set, turn the 934 * flag off and try again. This is just in 935 * case the drive in question barfs on the 936 * load eject flag. The CAM code should set 937 * the load/eject flag by default for 938 * removable media. 939 */ 940 941 /* XXX KDM 942 * Should we check to see what the specific 943 * scsi status is?? Or does it not matter 944 * since we already know that there was an 945 * error, and we know what the specific 946 * error code was, and we know what the 947 * opcode is.. 948 */ 949 if ((scsi_cmd->opcode == START_STOP_UNIT) && 950 ((scsi_cmd->how & SSS_LOEJ) != 0) && 951 (asc == 0x24) && (ascq == 0x00) && 952 (done_ccb->ccb_h.retry_count > 0)) { 953 954 scsi_cmd->how &= ~SSS_LOEJ; 955 956 xpt_action(done_ccb); 957 958 } else if (done_ccb->ccb_h.retry_count > 0) { 959 /* 960 * In this case, the error recovery 961 * command failed, but we've got 962 * some retries left on it. Give 963 * it another try. 964 */ 965 966 /* set the timeout to .5 sec */ 967 relsim_flags = 968 RELSIM_RELEASE_AFTER_TIMEOUT; 969 timeout = 500; 970 971 xpt_action(done_ccb); 972 973 break; 974 975 } else { 976 /* 977 * Copy the original CCB back and 978 * send it back to the caller. 979 */ 980 bcopy(done_ccb->ccb_h.saved_ccb_ptr, 981 done_ccb, sizeof(union ccb)); 982 983 periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG; 984 985 xpt_action(done_ccb); 986 } 987 } else { 988 /* 989 * Eh?? The command failed, but we don't 990 * have any sense. What's up with that? 991 * Fire the CCB again to return it to the 992 * caller. 993 */ 994 bcopy(done_ccb->ccb_h.saved_ccb_ptr, 995 done_ccb, sizeof(union ccb)); 996 997 periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG; 998 999 xpt_action(done_ccb); 1000 1001 } 1002 break; 1003 default: 1004 bcopy(done_ccb->ccb_h.saved_ccb_ptr, done_ccb, 1005 sizeof(union ccb)); 1006 1007 periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG; 1008 1009 xpt_action(done_ccb); 1010 1011 break; 1012 } 1013 1014 /* decrement the retry count */ 1015 if (done_ccb->ccb_h.retry_count > 0) 1016 done_ccb->ccb_h.retry_count--; 1017 1018 qfrozen_cnt = cam_release_devq(done_ccb->ccb_h.path, 1019 /*relsim_flags*/relsim_flags, 1020 /*openings*/0, 1021 /*timeout*/timeout, 1022 /*getcount_only*/0); 1023 } 1024 1025 /* 1026 * Generic error handler. Peripheral drivers usually filter 1027 * out the errors that they handle in a unique mannor, then 1028 * call this function. 1029 */ 1030 int 1031 cam_periph_error(union ccb *ccb, cam_flags camflags, 1032 u_int32_t sense_flags, union ccb *save_ccb) 1033 { 1034 cam_status status; 1035 int frozen; 1036 int sense; 1037 int error; 1038 int openings; 1039 int retry; 1040 u_int32_t relsim_flags; 1041 u_int32_t timeout; 1042 1043 status = ccb->ccb_h.status; 1044 frozen = (status & CAM_DEV_QFRZN) != 0; 1045 sense = (status & CAM_AUTOSNS_VALID) != 0; 1046 status &= CAM_STATUS_MASK; 1047 relsim_flags = 0; 1048 1049 1050 switch (status) { 1051 case CAM_REQ_CMP: 1052 /* decrement the number of retries */ 1053 retry = ccb->ccb_h.retry_count > 0; 1054 if (retry) 1055 ccb->ccb_h.retry_count--; 1056 error = 0; 1057 break; 1058 case CAM_SCSI_STATUS_ERROR: 1059 1060 switch (ccb->csio.scsi_status) { 1061 case SCSI_STATUS_OK: 1062 case SCSI_STATUS_COND_MET: 1063 case SCSI_STATUS_INTERMED: 1064 case SCSI_STATUS_INTERMED_COND_MET: 1065 error = 0; 1066 break; 1067 case SCSI_STATUS_CMD_TERMINATED: 1068 case SCSI_STATUS_CHECK_COND: 1069 if (sense != 0) { 1070 struct scsi_sense_data *sense; 1071 int error_code, sense_key, asc, ascq; 1072 struct cam_periph *periph; 1073 scsi_sense_action err_action; 1074 struct ccb_getdev cgd; 1075 1076 sense = &ccb->csio.sense_data; 1077 scsi_extract_sense(sense, &error_code, 1078 &sense_key, &asc, &ascq); 1079 periph = xpt_path_periph(ccb->ccb_h.path); 1080 1081 /* 1082 * Grab the inquiry data for this device. 1083 */ 1084 xpt_setup_ccb(&cgd.ccb_h, ccb->ccb_h.path, 1085 /*priority*/ 1); 1086 cgd.ccb_h.func_code = XPT_GDEV_TYPE; 1087 xpt_action((union ccb *)&cgd); 1088 1089 err_action = scsi_error_action(asc, ascq, 1090 &cgd.inq_data); 1091 1092 /* 1093 * Send a Test Unit Ready to the device. 1094 * If the 'many' flag is set, we send 120 1095 * test unit ready commands, one every half 1096 * second. Otherwise, we just send one TUR. 1097 * We only want to do this if the retry 1098 * count has not been exhausted. 1099 */ 1100 if (((err_action & SS_MASK) == SS_TUR) 1101 && save_ccb != NULL 1102 && ccb->ccb_h.retry_count > 0) { 1103 1104 /* 1105 * Since error recovery is already 1106 * in progress, don't attempt to 1107 * process this error. It is probably 1108 * related to the error that caused 1109 * the currently active error recovery 1110 * action. Also, we only have 1111 * space for one saved CCB, so if we 1112 * had two concurrent error recovery 1113 * actions, we would end up 1114 * over-writing one error recovery 1115 * CCB with another one. 1116 */ 1117 if (periph->flags & 1118 CAM_PERIPH_RECOVERY_INPROG) { 1119 error = ERESTART; 1120 break; 1121 } 1122 1123 periph->flags |= 1124 CAM_PERIPH_RECOVERY_INPROG; 1125 1126 /* decrement the number of retries */ 1127 if ((err_action & 1128 SSQ_DECREMENT_COUNT) != 0) { 1129 retry = 1; 1130 ccb->ccb_h.retry_count--; 1131 } 1132 1133 bcopy(ccb, save_ccb, sizeof(*save_ccb)); 1134 1135 /* 1136 * We retry this one every half 1137 * second for a minute. If the 1138 * device hasn't become ready in a 1139 * minute's time, it's unlikely to 1140 * ever become ready. If the table 1141 * doesn't specify SSQ_MANY, we can 1142 * only try this once. Oh well. 1143 */ 1144 if ((err_action & SSQ_MANY) != 0) 1145 scsi_test_unit_ready(&ccb->csio, 1146 /*retries*/120, 1147 camperiphdone, 1148 MSG_SIMPLE_Q_TAG, 1149 SSD_FULL_SIZE, 1150 /*timeout*/5000); 1151 else 1152 scsi_test_unit_ready(&ccb->csio, 1153 /*retries*/1, 1154 camperiphdone, 1155 MSG_SIMPLE_Q_TAG, 1156 SSD_FULL_SIZE, 1157 /*timeout*/5000); 1158 1159 /* release the queue after .5 sec. */ 1160 relsim_flags = 1161 RELSIM_RELEASE_AFTER_TIMEOUT; 1162 timeout = 500; 1163 /* 1164 * Drop the priority to 0 so that 1165 * we are the first to execute. Also 1166 * freeze the queue after this command 1167 * is sent so that we can restore the 1168 * old csio and have it queued in the 1169 * proper order before we let normal 1170 * transactions go to the drive. 1171 */ 1172 ccb->ccb_h.pinfo.priority = 0; 1173 ccb->ccb_h.flags |= CAM_DEV_QFREEZE; 1174 1175 /* 1176 * Save a pointer to the original 1177 * CCB in the new CCB. 1178 */ 1179 ccb->ccb_h.saved_ccb_ptr = save_ccb; 1180 1181 error = ERESTART; 1182 } 1183 /* 1184 * Send a start unit command to the device, 1185 * and then retry the command. We only 1186 * want to do this if the retry count has 1187 * not been exhausted. If the user 1188 * specified 0 retries, then we follow 1189 * their request and do not retry. 1190 */ 1191 else if (((err_action & SS_MASK) == SS_START) 1192 && save_ccb != NULL 1193 && ccb->ccb_h.retry_count > 0) { 1194 int le; 1195 1196 /* 1197 * Only one error recovery action 1198 * at a time. See above. 1199 */ 1200 if (periph->flags & 1201 CAM_PERIPH_RECOVERY_INPROG) { 1202 error = ERESTART; 1203 break; 1204 } 1205 1206 periph->flags |= 1207 CAM_PERIPH_RECOVERY_INPROG; 1208 1209 /* decrement the number of retries */ 1210 retry = 1; 1211 ccb->ccb_h.retry_count--; 1212 1213 /* 1214 * Check for removable media and 1215 * set load/eject flag 1216 * appropriately. 1217 */ 1218 if (SID_IS_REMOVABLE(&cgd.inq_data)) 1219 le = TRUE; 1220 else 1221 le = FALSE; 1222 1223 /* 1224 * Attempt to start the drive up. 1225 * 1226 * Save the current ccb so it can 1227 * be restored and retried once the 1228 * drive is started up. 1229 */ 1230 bcopy(ccb, save_ccb, sizeof(*save_ccb)); 1231 1232 scsi_start_stop(&ccb->csio, 1233 /*retries*/1, 1234 camperiphdone, 1235 MSG_SIMPLE_Q_TAG, 1236 /*start*/TRUE, 1237 /*load/eject*/le, 1238 /*immediate*/FALSE, 1239 SSD_FULL_SIZE, 1240 /*timeout*/50000); 1241 /* 1242 * Drop the priority to 0 so that 1243 * we are the first to execute. Also 1244 * freeze the queue after this command 1245 * is sent so that we can restore the 1246 * old csio and have it queued in the 1247 * proper order before we let normal 1248 * transactions go to the drive. 1249 */ 1250 ccb->ccb_h.pinfo.priority = 0; 1251 ccb->ccb_h.flags |= CAM_DEV_QFREEZE; 1252 1253 /* 1254 * Save a pointer to the original 1255 * CCB in the new CCB. 1256 */ 1257 ccb->ccb_h.saved_ccb_ptr = save_ccb; 1258 1259 error = ERESTART; 1260 } else if ((sense_flags & SF_RETRY_UA) != 0) { 1261 /* 1262 * XXX KDM this is a *horrible* 1263 * hack. 1264 */ 1265 error = scsi_interpret_sense(ccb, 1266 sense_flags, 1267 &relsim_flags, 1268 &openings, 1269 &timeout, 1270 err_action); 1271 } 1272 1273 /* 1274 * Theoretically, this code should send a 1275 * test unit ready to the given device, and 1276 * if it returns and error, send a start 1277 * unit command. Since we don't yet have 1278 * the capability to do two-command error 1279 * recovery, just send a start unit. 1280 * XXX KDM fix this! 1281 */ 1282 else if (((err_action & SS_MASK) == SS_TURSTART) 1283 && save_ccb != NULL 1284 && ccb->ccb_h.retry_count > 0) { 1285 int le; 1286 1287 /* 1288 * Only one error recovery action 1289 * at a time. See above. 1290 */ 1291 if (periph->flags & 1292 CAM_PERIPH_RECOVERY_INPROG) { 1293 error = ERESTART; 1294 break; 1295 } 1296 1297 periph->flags |= 1298 CAM_PERIPH_RECOVERY_INPROG; 1299 1300 /* decrement the number of retries */ 1301 retry = 1; 1302 ccb->ccb_h.retry_count--; 1303 1304 /* 1305 * Check for removable media and 1306 * set load/eject flag 1307 * appropriately. 1308 */ 1309 if (SID_IS_REMOVABLE(&cgd.inq_data)) 1310 le = TRUE; 1311 else 1312 le = FALSE; 1313 1314 /* 1315 * Attempt to start the drive up. 1316 * 1317 * Save the current ccb so it can 1318 * be restored and retried once the 1319 * drive is started up. 1320 */ 1321 bcopy(ccb, save_ccb, sizeof(*save_ccb)); 1322 1323 scsi_start_stop(&ccb->csio, 1324 /*retries*/1, 1325 camperiphdone, 1326 MSG_SIMPLE_Q_TAG, 1327 /*start*/TRUE, 1328 /*load/eject*/le, 1329 /*immediate*/FALSE, 1330 SSD_FULL_SIZE, 1331 /*timeout*/50000); 1332 1333 /* release the queue after .5 sec. */ 1334 relsim_flags = 1335 RELSIM_RELEASE_AFTER_TIMEOUT; 1336 timeout = 500; 1337 /* 1338 * Drop the priority to 0 so that 1339 * we are the first to execute. Also 1340 * freeze the queue after this command 1341 * is sent so that we can restore the 1342 * old csio and have it queued in the 1343 * proper order before we let normal 1344 * transactions go to the drive. 1345 */ 1346 ccb->ccb_h.pinfo.priority = 0; 1347 ccb->ccb_h.flags |= CAM_DEV_QFREEZE; 1348 1349 /* 1350 * Save a pointer to the original 1351 * CCB in the new CCB. 1352 */ 1353 ccb->ccb_h.saved_ccb_ptr = save_ccb; 1354 1355 error = ERESTART; 1356 } else { 1357 error = scsi_interpret_sense(ccb, 1358 sense_flags, 1359 &relsim_flags, 1360 &openings, 1361 &timeout, 1362 err_action); 1363 } 1364 } else if (ccb->csio.scsi_status == 1365 SCSI_STATUS_CHECK_COND) { 1366 /* no point in decrementing the retry count */ 1367 panic("cam_periph_error: scsi status of " 1368 "CHECK COND returned but no sense " 1369 "information is availible. " 1370 "Controller should have returned " 1371 "CAM_AUTOSENSE_FAILED"); 1372 /* NOTREACHED */ 1373 error = EIO; 1374 } else if (ccb->ccb_h.retry_count > 0) { 1375 /* 1376 * XXX KDM shouldn't there be a better 1377 * argument to return?? 1378 */ 1379 error = EIO; 1380 } else { 1381 /* decrement the number of retries */ 1382 retry = ccb->ccb_h.retry_count > 0; 1383 if (retry) 1384 ccb->ccb_h.retry_count--; 1385 /* 1386 * If it was aborted with no 1387 * clue as to the reason, just 1388 * retry it again. 1389 */ 1390 error = ERESTART; 1391 } 1392 break; 1393 case SCSI_STATUS_QUEUE_FULL: 1394 { 1395 /* no decrement */ 1396 struct ccb_getdev cgd; 1397 1398 /* 1399 * First off, find out what the current 1400 * transaction counts are. 1401 */ 1402 xpt_setup_ccb(&cgd.ccb_h, 1403 ccb->ccb_h.path, 1404 /*priority*/1); 1405 cgd.ccb_h.func_code = XPT_GDEV_TYPE; 1406 xpt_action((union ccb *)&cgd); 1407 1408 /* 1409 * If we were the only transaction active, treat 1410 * the QUEUE FULL as if it were a BUSY condition. 1411 */ 1412 if (cgd.dev_active != 0) { 1413 /* 1414 * Reduce the number of openings to 1415 * be 1 less than the amount it took 1416 * to get a queue full bounded by the 1417 * minimum allowed tag count for this 1418 * device. 1419 */ 1420 openings = cgd.dev_active; 1421 if (openings < cgd.mintags) 1422 openings = cgd.mintags; 1423 if (openings < cgd.dev_active+cgd.dev_openings) 1424 relsim_flags = RELSIM_ADJUST_OPENINGS; 1425 else { 1426 /* 1427 * Some devices report queue full for 1428 * temporary resource shortages. For 1429 * this reason, we allow a minimum 1430 * tag count to be entered via a 1431 * quirk entry to prevent the queue 1432 * count on these devices from falling 1433 * to a pessimisticly low value. We 1434 * still wait for the next successful 1435 * completion, however, before queueing 1436 * more transactions to the device. 1437 */ 1438 relsim_flags = 1439 RELSIM_RELEASE_AFTER_CMDCMPLT; 1440 } 1441 timeout = 0; 1442 error = ERESTART; 1443 break; 1444 } 1445 /* FALLTHROUGH */ 1446 } 1447 case SCSI_STATUS_BUSY: 1448 /* 1449 * Restart the queue after either another 1450 * command completes or a 1 second timeout. 1451 */ 1452 /* 1453 * XXX KDM ask JTG about this again, do we need to 1454 * be looking at the retry count here? 1455 */ 1456 error = ERESTART; 1457 relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT 1458 | RELSIM_RELEASE_AFTER_CMDCMPLT; 1459 timeout = 1000; 1460 break; 1461 case SCSI_STATUS_RESERV_CONFLICT: 1462 error = EIO; 1463 break; 1464 default: 1465 error = EIO; 1466 break; 1467 } 1468 break; 1469 case CAM_REQ_CMP_ERR: 1470 case CAM_AUTOSENSE_FAIL: 1471 case CAM_CMD_TIMEOUT: 1472 case CAM_UNEXP_BUSFREE: 1473 case CAM_UNCOR_PARITY: 1474 case CAM_DATA_RUN_ERR: 1475 /* decrement the number of retries */ 1476 retry = ccb->ccb_h.retry_count > 0; 1477 if (retry) { 1478 ccb->ccb_h.retry_count--; 1479 error = ERESTART; 1480 } else { 1481 error = EIO; 1482 } 1483 break; 1484 case CAM_UA_ABORT: 1485 case CAM_UA_TERMIO: 1486 case CAM_MSG_REJECT_REC: 1487 /* XXX Don't know that these are correct */ 1488 error = EIO; 1489 break; 1490 case CAM_SEL_TIMEOUT: 1491 { 1492 /* 1493 * XXX 1494 * A single selection timeout should not be enough 1495 * to invalidate a device. We should retry for multiple 1496 * seconds assuming this isn't a probe. We'll probably 1497 * need a special flag for that. 1498 */ 1499 #if 0 1500 struct cam_path *newpath; 1501 1502 /* Should we do more if we can't create the path?? */ 1503 if (xpt_create_path(&newpath, xpt_path_periph(ccb->ccb_h.path), 1504 xpt_path_path_id(ccb->ccb_h.path), 1505 xpt_path_target_id(ccb->ccb_h.path), 1506 CAM_LUN_WILDCARD) != CAM_REQ_CMP) 1507 break; 1508 /* 1509 * Let peripheral drivers know that this device has gone 1510 * away. 1511 */ 1512 xpt_async(AC_LOST_DEVICE, newpath, NULL); 1513 xpt_free_path(newpath); 1514 #endif 1515 error = ENXIO; 1516 break; 1517 } 1518 case CAM_REQ_INVALID: 1519 case CAM_PATH_INVALID: 1520 case CAM_DEV_NOT_THERE: 1521 case CAM_NO_HBA: 1522 case CAM_PROVIDE_FAIL: 1523 case CAM_REQ_TOO_BIG: 1524 error = EINVAL; 1525 break; 1526 case CAM_SCSI_BUS_RESET: 1527 case CAM_BDR_SENT: 1528 case CAM_REQUEUE_REQ: 1529 /* Unconditional requeue, dammit */ 1530 error = ERESTART; 1531 break; 1532 case CAM_RESRC_UNAVAIL: 1533 case CAM_BUSY: 1534 /* timeout??? */ 1535 default: 1536 /* decrement the number of retries */ 1537 retry = ccb->ccb_h.retry_count > 0; 1538 if (retry) { 1539 ccb->ccb_h.retry_count--; 1540 error = ERESTART; 1541 } else { 1542 /* Check the sense codes */ 1543 error = EIO; 1544 } 1545 break; 1546 } 1547 1548 /* Attempt a retry */ 1549 if (error == ERESTART || error == 0) { 1550 if (frozen != 0) 1551 ccb->ccb_h.status &= ~CAM_DEV_QFRZN; 1552 1553 if (error == ERESTART) 1554 xpt_action(ccb); 1555 1556 if (frozen != 0) { 1557 cam_release_devq(ccb->ccb_h.path, 1558 relsim_flags, 1559 openings, 1560 timeout, 1561 /*getcount_only*/0); 1562 } 1563 } 1564 1565 1566 return (error); 1567 } 1568