cam_periph.c revision 71999
1/* 2 * Common functions for CAM "type" (peripheral) drivers. 3 * 4 * Copyright (c) 1997, 1998 Justin T. Gibbs. 5 * Copyright (c) 1997, 1998, 1999, 2000 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 * $FreeBSD: head/sys/cam/cam_periph.c 71999 2001-02-04 13:13:25Z phk $ 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/linker_set.h> 37#include <sys/bio.h> 38#include <sys/buf.h> 39#include <sys/proc.h> 40#include <sys/devicestat.h> 41#include <sys/bus.h> 42#include <vm/vm.h> 43#include <vm/vm_extern.h> 44 45#include <cam/cam.h> 46#include <cam/cam_ccb.h> 47#include <cam/cam_xpt_periph.h> 48#include <cam/cam_periph.h> 49#include <cam/cam_debug.h> 50 51#include <cam/scsi/scsi_all.h> 52#include <cam/scsi/scsi_message.h> 53#include <cam/scsi/scsi_pass.h> 54 55static u_int camperiphnextunit(struct periph_driver *p_drv, 56 u_int newunit, int wired, 57 path_id_t pathid, target_id_t target, 58 lun_id_t lun); 59static u_int camperiphunit(struct periph_driver *p_drv, 60 path_id_t pathid, target_id_t target, 61 lun_id_t lun); 62static void camperiphdone(struct cam_periph *periph, 63 union ccb *done_ccb); 64static void camperiphfree(struct cam_periph *periph); 65 66cam_status 67cam_periph_alloc(periph_ctor_t *periph_ctor, 68 periph_oninv_t *periph_oninvalidate, 69 periph_dtor_t *periph_dtor, periph_start_t *periph_start, 70 char *name, cam_periph_type type, struct cam_path *path, 71 ac_callback_t *ac_callback, ac_code code, void *arg) 72{ 73 struct periph_driver **p_drv; 74 struct cam_periph *periph; 75 struct cam_periph *cur_periph; 76 path_id_t path_id; 77 target_id_t target_id; 78 lun_id_t lun_id; 79 cam_status status; 80 u_int init_level; 81 int s; 82 83 init_level = 0; 84 /* 85 * Handle Hot-Plug scenarios. If there is already a peripheral 86 * of our type assigned to this path, we are likely waiting for 87 * final close on an old, invalidated, peripheral. If this is 88 * the case, queue up a deferred call to the peripheral's async 89 * handler. If it looks like a mistaken re-alloation, complain. 90 */ 91 if ((periph = cam_periph_find(path, name)) != NULL) { 92 93 if ((periph->flags & CAM_PERIPH_INVALID) != 0 94 && (periph->flags & CAM_PERIPH_NEW_DEV_FOUND) == 0) { 95 periph->flags |= CAM_PERIPH_NEW_DEV_FOUND; 96 periph->deferred_callback = ac_callback; 97 periph->deferred_ac = code; 98 return (CAM_REQ_INPROG); 99 } else { 100 printf("cam_periph_alloc: attempt to re-allocate " 101 "valid device %s%d rejected\n", 102 periph->periph_name, periph->unit_number); 103 } 104 return (CAM_REQ_INVALID); 105 } 106 107 periph = (struct cam_periph *)malloc(sizeof(*periph), M_DEVBUF, 108 M_NOWAIT); 109 110 if (periph == NULL) 111 return (CAM_RESRC_UNAVAIL); 112 113 init_level++; 114 115 for (p_drv = (struct periph_driver **)periphdriver_set.ls_items; 116 *p_drv != NULL; p_drv++) { 117 if (strcmp((*p_drv)->driver_name, name) == 0) 118 break; 119 } 120 121 path_id = xpt_path_path_id(path); 122 target_id = xpt_path_target_id(path); 123 lun_id = xpt_path_lun_id(path); 124 bzero(periph, sizeof(*periph)); 125 cam_init_pinfo(&periph->pinfo); 126 periph->periph_start = periph_start; 127 periph->periph_dtor = periph_dtor; 128 periph->periph_oninval = periph_oninvalidate; 129 periph->type = type; 130 periph->periph_name = name; 131 periph->unit_number = camperiphunit(*p_drv, path_id, target_id, lun_id); 132 periph->immediate_priority = CAM_PRIORITY_NONE; 133 periph->refcount = 0; 134 SLIST_INIT(&periph->ccb_list); 135 status = xpt_create_path(&path, periph, path_id, target_id, lun_id); 136 if (status != CAM_REQ_CMP) 137 goto failure; 138 139 periph->path = path; 140 init_level++; 141 142 status = xpt_add_periph(periph); 143 144 if (status != CAM_REQ_CMP) 145 goto failure; 146 147 s = splsoftcam(); 148 cur_periph = TAILQ_FIRST(&(*p_drv)->units); 149 while (cur_periph != NULL 150 && cur_periph->unit_number < periph->unit_number) 151 cur_periph = TAILQ_NEXT(cur_periph, unit_links); 152 153 if (cur_periph != NULL) 154 TAILQ_INSERT_BEFORE(cur_periph, periph, unit_links); 155 else { 156 TAILQ_INSERT_TAIL(&(*p_drv)->units, periph, unit_links); 157 (*p_drv)->generation++; 158 } 159 160 splx(s); 161 162 init_level++; 163 164 status = periph_ctor(periph, arg); 165 166 if (status == CAM_REQ_CMP) 167 init_level++; 168 169failure: 170 switch (init_level) { 171 case 4: 172 /* Initialized successfully */ 173 break; 174 case 3: 175 s = splsoftcam(); 176 TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links); 177 splx(s); 178 xpt_remove_periph(periph); 179 case 2: 180 xpt_free_path(periph->path); 181 case 1: 182 free(periph, M_DEVBUF); 183 case 0: 184 /* No cleanup to perform. */ 185 break; 186 default: 187 panic("cam_periph_alloc: Unkown init level"); 188 } 189 return(status); 190} 191 192/* 193 * Find a peripheral structure with the specified path, target, lun, 194 * and (optionally) type. If the name is NULL, this function will return 195 * the first peripheral driver that matches the specified path. 196 */ 197struct cam_periph * 198cam_periph_find(struct cam_path *path, char *name) 199{ 200 struct periph_driver **p_drv; 201 struct cam_periph *periph; 202 int s; 203 204 for (p_drv = (struct periph_driver **)periphdriver_set.ls_items; 205 *p_drv != NULL; p_drv++) { 206 207 if (name != NULL && (strcmp((*p_drv)->driver_name, name) != 0)) 208 continue; 209 210 s = splsoftcam(); 211 for (periph = TAILQ_FIRST(&(*p_drv)->units); periph != NULL; 212 periph = TAILQ_NEXT(periph, unit_links)) { 213 if (xpt_path_comp(periph->path, path) == 0) { 214 splx(s); 215 return(periph); 216 } 217 } 218 splx(s); 219 if (name != NULL) 220 return(NULL); 221 } 222 return(NULL); 223} 224 225cam_status 226cam_periph_acquire(struct cam_periph *periph) 227{ 228 int s; 229 230 if (periph == NULL) 231 return(CAM_REQ_CMP_ERR); 232 233 s = splsoftcam(); 234 periph->refcount++; 235 splx(s); 236 237 return(CAM_REQ_CMP); 238} 239 240void 241cam_periph_release(struct cam_periph *periph) 242{ 243 int s; 244 245 if (periph == NULL) 246 return; 247 248 s = splsoftcam(); 249 if ((--periph->refcount == 0) 250 && (periph->flags & CAM_PERIPH_INVALID)) { 251 camperiphfree(periph); 252 } 253 splx(s); 254 255} 256 257/* 258 * Look for the next unit number that is not currently in use for this 259 * peripheral type starting at "newunit". Also exclude unit numbers that 260 * are reserved by for future "hardwiring" unless we already know that this 261 * is a potential wired device. Only assume that the device is "wired" the 262 * first time through the loop since after that we'll be looking at unit 263 * numbers that did not match a wiring entry. 264 */ 265static u_int 266camperiphnextunit(struct periph_driver *p_drv, u_int newunit, int wired, 267 path_id_t pathid, target_id_t target, lun_id_t lun) 268{ 269 struct cam_periph *periph; 270 char *periph_name, *strval; 271 int s; 272 int i, val, dunit; 273 const char *dname; 274 275 s = splsoftcam(); 276 periph_name = p_drv->driver_name; 277 for (;;newunit++) { 278 279 for (periph = TAILQ_FIRST(&p_drv->units); 280 periph != NULL && periph->unit_number != newunit; 281 periph = TAILQ_NEXT(periph, unit_links)) 282 ; 283 284 if (periph != NULL && periph->unit_number == newunit) { 285 if (wired != 0) { 286 xpt_print_path(periph->path); 287 printf("Duplicate Wired Device entry!\n"); 288 xpt_print_path(periph->path); 289 printf("Second device (%s device at scbus%d " 290 "target %d lun %d) will not be wired\n", 291 periph_name, pathid, target, lun); 292 wired = 0; 293 } 294 continue; 295 } 296 if (wired) 297 break; 298 299 /* 300 * Don't match entries like "da 4" as a wired down 301 * device, but do match entries like "da 4 target 5" 302 * or even "da 4 scbus 1". 303 */ 304 i = -1; 305 while ((i = resource_locate(i, periph_name)) != -1) { 306 dname = resource_query_name(i); 307 dunit = resource_query_unit(i); 308 /* if no "target" and no specific scbus, skip */ 309 if (resource_int_value(dname, dunit, "target", &val) && 310 (resource_string_value(dname, dunit, "at",&strval)|| 311 strcmp(strval, "scbus") == 0)) 312 continue; 313 if (newunit == dunit) 314 break; 315 } 316 if (i == -1) 317 break; 318 } 319 splx(s); 320 return (newunit); 321} 322 323static u_int 324camperiphunit(struct periph_driver *p_drv, path_id_t pathid, 325 target_id_t target, lun_id_t lun) 326{ 327 u_int unit; 328 int hit, i, val, dunit; 329 const char *dname; 330 char pathbuf[32], *strval, *periph_name; 331 332 unit = 0; 333 hit = 0; 334 335 periph_name = p_drv->driver_name; 336 snprintf(pathbuf, sizeof(pathbuf), "scbus%d", pathid); 337 i = -1; 338 while ((i = resource_locate(i, periph_name)) != -1) { 339 dname = resource_query_name(i); 340 dunit = resource_query_unit(i); 341 if (resource_string_value(dname, dunit, "at", &strval) == 0) { 342 if (strcmp(strval, pathbuf) != 0) 343 continue; 344 hit++; 345 } 346 if (resource_int_value(dname, dunit, "target", &val) == 0) { 347 if (val != target) 348 continue; 349 hit++; 350 } 351 if (resource_int_value(dname, dunit, "lun", &val) == 0) { 352 if (val != lun) 353 continue; 354 hit++; 355 } 356 if (hit != 0) { 357 unit = dunit; 358 break; 359 } 360 } 361 362 /* 363 * Either start from 0 looking for the next unit or from 364 * the unit number given in the resource config. This way, 365 * if we have wildcard matches, we don't return the same 366 * unit number twice. 367 */ 368 unit = camperiphnextunit(p_drv, unit, /*wired*/hit, pathid, 369 target, lun); 370 371 return (unit); 372} 373 374void 375cam_periph_invalidate(struct cam_periph *periph) 376{ 377 int s; 378 379 s = splsoftcam(); 380 /* 381 * We only call this routine the first time a peripheral is 382 * invalidated. The oninvalidate() routine is always called at 383 * splsoftcam(). 384 */ 385 if (((periph->flags & CAM_PERIPH_INVALID) == 0) 386 && (periph->periph_oninval != NULL)) 387 periph->periph_oninval(periph); 388 389 periph->flags |= CAM_PERIPH_INVALID; 390 periph->flags &= ~CAM_PERIPH_NEW_DEV_FOUND; 391 392 if (periph->refcount == 0) 393 camperiphfree(periph); 394 else if (periph->refcount < 0) 395 printf("cam_invalidate_periph: refcount < 0!!\n"); 396 splx(s); 397} 398 399static void 400camperiphfree(struct cam_periph *periph) 401{ 402 int s; 403 struct periph_driver **p_drv; 404 405 for (p_drv = (struct periph_driver **)periphdriver_set.ls_items; 406 *p_drv != NULL; p_drv++) { 407 if (strcmp((*p_drv)->driver_name, periph->periph_name) == 0) 408 break; 409 } 410 411 if (periph->periph_dtor != NULL) 412 periph->periph_dtor(periph); 413 414 s = splsoftcam(); 415 TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links); 416 (*p_drv)->generation++; 417 splx(s); 418 419 xpt_remove_periph(periph); 420 421 if (periph->flags & CAM_PERIPH_NEW_DEV_FOUND) { 422 union ccb ccb; 423 void *arg; 424 425 switch (periph->deferred_ac) { 426 case AC_FOUND_DEVICE: 427 ccb.ccb_h.func_code = XPT_GDEV_TYPE; 428 xpt_setup_ccb(&ccb.ccb_h, periph->path, /*priority*/ 1); 429 xpt_action(&ccb); 430 arg = &ccb; 431 break; 432 case AC_PATH_REGISTERED: 433 ccb.ccb_h.func_code = XPT_PATH_INQ; 434 xpt_setup_ccb(&ccb.ccb_h, periph->path, /*priority*/ 1); 435 xpt_action(&ccb); 436 arg = &ccb; 437 break; 438 default: 439 arg = NULL; 440 break; 441 } 442 periph->deferred_callback(NULL, periph->deferred_ac, 443 periph->path, arg); 444 } 445 xpt_free_path(periph->path); 446 free(periph, M_DEVBUF); 447} 448 449/* 450 * Wait interruptibly for an exclusive lock. 451 */ 452int 453cam_periph_lock(struct cam_periph *periph, int priority) 454{ 455 int error; 456 457 while ((periph->flags & CAM_PERIPH_LOCKED) != 0) { 458 periph->flags |= CAM_PERIPH_LOCK_WANTED; 459 if ((error = tsleep(periph, priority, "caplck", 0)) != 0) 460 return error; 461 } 462 463 if (cam_periph_acquire(periph) != CAM_REQ_CMP) 464 return(ENXIO); 465 466 periph->flags |= CAM_PERIPH_LOCKED; 467 return 0; 468} 469 470/* 471 * Unlock and wake up any waiters. 472 */ 473void 474cam_periph_unlock(struct cam_periph *periph) 475{ 476 periph->flags &= ~CAM_PERIPH_LOCKED; 477 if ((periph->flags & CAM_PERIPH_LOCK_WANTED) != 0) { 478 periph->flags &= ~CAM_PERIPH_LOCK_WANTED; 479 wakeup(periph); 480 } 481 482 cam_periph_release(periph); 483} 484 485/* 486 * Map user virtual pointers into kernel virtual address space, so we can 487 * access the memory. This won't work on physical pointers, for now it's 488 * up to the caller to check for that. (XXX KDM -- should we do that here 489 * instead?) This also only works for up to MAXPHYS memory. Since we use 490 * buffers to map stuff in and out, we're limited to the buffer size. 491 */ 492int 493cam_periph_mapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo) 494{ 495 int numbufs, i; 496 int flags[CAM_PERIPH_MAXMAPS]; 497 u_int8_t **data_ptrs[CAM_PERIPH_MAXMAPS]; 498 u_int32_t lengths[CAM_PERIPH_MAXMAPS]; 499 u_int32_t dirs[CAM_PERIPH_MAXMAPS]; 500 501 switch(ccb->ccb_h.func_code) { 502 case XPT_DEV_MATCH: 503 if (ccb->cdm.match_buf_len == 0) { 504 printf("cam_periph_mapmem: invalid match buffer " 505 "length 0\n"); 506 return(EINVAL); 507 } 508 if (ccb->cdm.pattern_buf_len > 0) { 509 data_ptrs[0] = (u_int8_t **)&ccb->cdm.patterns; 510 lengths[0] = ccb->cdm.pattern_buf_len; 511 dirs[0] = CAM_DIR_OUT; 512 data_ptrs[1] = (u_int8_t **)&ccb->cdm.matches; 513 lengths[1] = ccb->cdm.match_buf_len; 514 dirs[1] = CAM_DIR_IN; 515 numbufs = 2; 516 } else { 517 data_ptrs[0] = (u_int8_t **)&ccb->cdm.matches; 518 lengths[0] = ccb->cdm.match_buf_len; 519 dirs[0] = CAM_DIR_IN; 520 numbufs = 1; 521 } 522 break; 523 case XPT_SCSI_IO: 524 case XPT_CONT_TARGET_IO: 525 if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_NONE) 526 return(0); 527 528 data_ptrs[0] = &ccb->csio.data_ptr; 529 lengths[0] = ccb->csio.dxfer_len; 530 dirs[0] = ccb->ccb_h.flags & CAM_DIR_MASK; 531 numbufs = 1; 532 break; 533 default: 534 return(EINVAL); 535 break; /* NOTREACHED */ 536 } 537 538 /* 539 * Check the transfer length and permissions first, so we don't 540 * have to unmap any previously mapped buffers. 541 */ 542 for (i = 0; i < numbufs; i++) { 543 544 flags[i] = 0; 545 546 /* 547 * The userland data pointer passed in may not be page 548 * aligned. vmapbuf() truncates the address to a page 549 * boundary, so if the address isn't page aligned, we'll 550 * need enough space for the given transfer length, plus 551 * whatever extra space is necessary to make it to the page 552 * boundary. 553 */ 554 if ((lengths[i] + 555 (((vm_offset_t)(*data_ptrs[i])) & PAGE_MASK)) > DFLTPHYS){ 556 printf("cam_periph_mapmem: attempt to map %lu bytes, " 557 "which is greater than DFLTPHYS(%d)\n", 558 (long)(lengths[i] + 559 (((vm_offset_t)(*data_ptrs[i])) & PAGE_MASK)), 560 DFLTPHYS); 561 return(E2BIG); 562 } 563 564 if (dirs[i] & CAM_DIR_OUT) { 565 flags[i] = BIO_WRITE; 566 if (!useracc(*data_ptrs[i], lengths[i], 567 VM_PROT_READ)) { 568 printf("cam_periph_mapmem: error, " 569 "address %p, length %lu isn't " 570 "user accessible for READ\n", 571 (void *)*data_ptrs[i], 572 (u_long)lengths[i]); 573 return(EACCES); 574 } 575 } 576 577 if (dirs[i] & CAM_DIR_IN) { 578 flags[i] = BIO_READ; 579 if (!useracc(*data_ptrs[i], lengths[i], 580 VM_PROT_WRITE)) { 581 printf("cam_periph_mapmem: error, " 582 "address %p, length %lu isn't " 583 "user accessible for WRITE\n", 584 (void *)*data_ptrs[i], 585 (u_long)lengths[i]); 586 587 return(EACCES); 588 } 589 } 590 591 } 592 593 /* this keeps the current process from getting swapped */ 594 /* 595 * XXX KDM should I use P_NOSWAP instead? 596 */ 597 PHOLD(curproc); 598 599 for (i = 0; i < numbufs; i++) { 600 /* 601 * Get the buffer. 602 */ 603 mapinfo->bp[i] = getpbuf(NULL); 604 605 /* save the buffer's data address */ 606 mapinfo->bp[i]->b_saveaddr = mapinfo->bp[i]->b_data; 607 608 /* put our pointer in the data slot */ 609 mapinfo->bp[i]->b_data = *data_ptrs[i]; 610 611 /* set the transfer length, we know it's < DFLTPHYS */ 612 mapinfo->bp[i]->b_bufsize = lengths[i]; 613 614 /* set the flags */ 615 mapinfo->bp[i]->b_flags = B_PHYS; 616 617 /* set the direction */ 618 mapinfo->bp[i]->b_iocmd = flags[i]; 619 620 /* map the buffer into kernel memory */ 621 vmapbuf(mapinfo->bp[i]); 622 623 /* set our pointer to the new mapped area */ 624 *data_ptrs[i] = mapinfo->bp[i]->b_data; 625 626 mapinfo->num_bufs_used++; 627 } 628 629 return(0); 630} 631 632/* 633 * Unmap memory segments mapped into kernel virtual address space by 634 * cam_periph_mapmem(). 635 */ 636void 637cam_periph_unmapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo) 638{ 639 int numbufs, i; 640 u_int8_t **data_ptrs[CAM_PERIPH_MAXMAPS]; 641 642 if (mapinfo->num_bufs_used <= 0) { 643 /* allow ourselves to be swapped once again */ 644 PRELE(curproc); 645 return; 646 } 647 648 switch (ccb->ccb_h.func_code) { 649 case XPT_DEV_MATCH: 650 numbufs = min(mapinfo->num_bufs_used, 2); 651 652 if (numbufs == 1) { 653 data_ptrs[0] = (u_int8_t **)&ccb->cdm.matches; 654 } else { 655 data_ptrs[0] = (u_int8_t **)&ccb->cdm.patterns; 656 data_ptrs[1] = (u_int8_t **)&ccb->cdm.matches; 657 } 658 break; 659 case XPT_SCSI_IO: 660 case XPT_CONT_TARGET_IO: 661 data_ptrs[0] = &ccb->csio.data_ptr; 662 numbufs = min(mapinfo->num_bufs_used, 1); 663 break; 664 default: 665 /* allow ourselves to be swapped once again */ 666 PRELE(curproc); 667 return; 668 break; /* NOTREACHED */ 669 } 670 671 for (i = 0; i < numbufs; i++) { 672 /* Set the user's pointer back to the original value */ 673 *data_ptrs[i] = mapinfo->bp[i]->b_saveaddr; 674 675 /* unmap the buffer */ 676 vunmapbuf(mapinfo->bp[i]); 677 678 /* clear the flags we set above */ 679 mapinfo->bp[i]->b_flags &= ~B_PHYS; 680 681 /* release the buffer */ 682 relpbuf(mapinfo->bp[i], NULL); 683 } 684 685 /* allow ourselves to be swapped once again */ 686 PRELE(curproc); 687} 688 689union ccb * 690cam_periph_getccb(struct cam_periph *periph, u_int32_t priority) 691{ 692 struct ccb_hdr *ccb_h; 693 int s; 694 695 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("entering cdgetccb\n")); 696 697 s = splsoftcam(); 698 699 while (SLIST_FIRST(&periph->ccb_list) == NULL) { 700 if (periph->immediate_priority > priority) 701 periph->immediate_priority = priority; 702 xpt_schedule(periph, priority); 703 if ((SLIST_FIRST(&periph->ccb_list) != NULL) 704 && (SLIST_FIRST(&periph->ccb_list)->pinfo.priority == priority)) 705 break; 706 tsleep(&periph->ccb_list, PRIBIO, "cgticb", 0); 707 } 708 709 ccb_h = SLIST_FIRST(&periph->ccb_list); 710 SLIST_REMOVE_HEAD(&periph->ccb_list, periph_links.sle); 711 splx(s); 712 return ((union ccb *)ccb_h); 713} 714 715void 716cam_periph_ccbwait(union ccb *ccb) 717{ 718 int s; 719 720 s = splsoftcam(); 721 if ((ccb->ccb_h.pinfo.index != CAM_UNQUEUED_INDEX) 722 || ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_INPROG)) 723 tsleep(&ccb->ccb_h.cbfcnp, PRIBIO, "cbwait", 0); 724 725 splx(s); 726} 727 728int 729cam_periph_ioctl(struct cam_periph *periph, int cmd, caddr_t addr, 730 int (*error_routine)(union ccb *ccb, 731 cam_flags camflags, 732 u_int32_t sense_flags)) 733{ 734 union ccb *ccb; 735 int error; 736 int found; 737 738 error = found = 0; 739 740 switch(cmd){ 741 case CAMGETPASSTHRU: 742 ccb = cam_periph_getccb(periph, /* priority */ 1); 743 xpt_setup_ccb(&ccb->ccb_h, 744 ccb->ccb_h.path, 745 /*priority*/1); 746 ccb->ccb_h.func_code = XPT_GDEVLIST; 747 748 /* 749 * Basically, the point of this is that we go through 750 * getting the list of devices, until we find a passthrough 751 * device. In the current version of the CAM code, the 752 * only way to determine what type of device we're dealing 753 * with is by its name. 754 */ 755 while (found == 0) { 756 ccb->cgdl.index = 0; 757 ccb->cgdl.status = CAM_GDEVLIST_MORE_DEVS; 758 while (ccb->cgdl.status == CAM_GDEVLIST_MORE_DEVS) { 759 760 /* we want the next device in the list */ 761 xpt_action(ccb); 762 if (strncmp(ccb->cgdl.periph_name, 763 "pass", 4) == 0){ 764 found = 1; 765 break; 766 } 767 } 768 if ((ccb->cgdl.status == CAM_GDEVLIST_LAST_DEVICE) && 769 (found == 0)) { 770 ccb->cgdl.periph_name[0] = '\0'; 771 ccb->cgdl.unit_number = 0; 772 break; 773 } 774 } 775 776 /* copy the result back out */ 777 bcopy(ccb, addr, sizeof(union ccb)); 778 779 /* and release the ccb */ 780 xpt_release_ccb(ccb); 781 782 break; 783 default: 784 error = ENOTTY; 785 break; 786 } 787 return(error); 788} 789 790int 791cam_periph_runccb(union ccb *ccb, 792 int (*error_routine)(union ccb *ccb, 793 cam_flags camflags, 794 u_int32_t sense_flags), 795 cam_flags camflags, u_int32_t sense_flags, 796 struct devstat *ds) 797{ 798 int error; 799 800 error = 0; 801 802 /* 803 * If the user has supplied a stats structure, and if we understand 804 * this particular type of ccb, record the transaction start. 805 */ 806 if ((ds != NULL) && (ccb->ccb_h.func_code == XPT_SCSI_IO)) 807 devstat_start_transaction(ds); 808 809 xpt_action(ccb); 810 811 do { 812 cam_periph_ccbwait(ccb); 813 if ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP) 814 error = 0; 815 else if (error_routine != NULL) 816 error = (*error_routine)(ccb, camflags, sense_flags); 817 else 818 error = 0; 819 820 } while (error == ERESTART); 821 822 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) 823 cam_release_devq(ccb->ccb_h.path, 824 /* relsim_flags */0, 825 /* openings */0, 826 /* timeout */0, 827 /* getcount_only */ FALSE); 828 829 if ((ds != NULL) && (ccb->ccb_h.func_code == XPT_SCSI_IO)) 830 devstat_end_transaction(ds, 831 ccb->csio.dxfer_len, 832 ccb->csio.tag_action & 0xf, 833 ((ccb->ccb_h.flags & CAM_DIR_MASK) == 834 CAM_DIR_NONE) ? DEVSTAT_NO_DATA : 835 (ccb->ccb_h.flags & CAM_DIR_OUT) ? 836 DEVSTAT_WRITE : 837 DEVSTAT_READ); 838 839 return(error); 840} 841 842void 843cam_freeze_devq(struct cam_path *path) 844{ 845 struct ccb_hdr ccb_h; 846 847 xpt_setup_ccb(&ccb_h, path, /*priority*/1); 848 ccb_h.func_code = XPT_NOOP; 849 ccb_h.flags = CAM_DEV_QFREEZE; 850 xpt_action((union ccb *)&ccb_h); 851} 852 853u_int32_t 854cam_release_devq(struct cam_path *path, u_int32_t relsim_flags, 855 u_int32_t openings, u_int32_t timeout, 856 int getcount_only) 857{ 858 struct ccb_relsim crs; 859 860 xpt_setup_ccb(&crs.ccb_h, path, 861 /*priority*/1); 862 crs.ccb_h.func_code = XPT_REL_SIMQ; 863 crs.ccb_h.flags = getcount_only ? CAM_DEV_QFREEZE : 0; 864 crs.release_flags = relsim_flags; 865 crs.openings = openings; 866 crs.release_timeout = timeout; 867 xpt_action((union ccb *)&crs); 868 return (crs.qfrozen_cnt); 869} 870 871#define saved_ccb_ptr ppriv_ptr0 872static void 873camperiphdone(struct cam_periph *periph, union ccb *done_ccb) 874{ 875 cam_status status; 876 int frozen; 877 int sense; 878 struct scsi_start_stop_unit *scsi_cmd; 879 u_int32_t relsim_flags, timeout; 880 u_int32_t qfrozen_cnt; 881 882 status = done_ccb->ccb_h.status; 883 frozen = (status & CAM_DEV_QFRZN) != 0; 884 sense = (status & CAM_AUTOSNS_VALID) != 0; 885 status &= CAM_STATUS_MASK; 886 887 timeout = 0; 888 relsim_flags = 0; 889 890 /* 891 * Unfreeze the queue once if it is already frozen.. 892 */ 893 if (frozen != 0) { 894 qfrozen_cnt = cam_release_devq(done_ccb->ccb_h.path, 895 /*relsim_flags*/0, 896 /*openings*/0, 897 /*timeout*/0, 898 /*getcount_only*/0); 899 } 900 901 switch (status) { 902 903 case CAM_REQ_CMP: 904 905 /* 906 * If we have successfully taken a device from the not 907 * ready to ready state, re-scan the device and re-get the 908 * inquiry information. Many devices (mostly disks) don't 909 * properly report their inquiry information unless they 910 * are spun up. 911 */ 912 if (done_ccb->ccb_h.func_code == XPT_SCSI_IO) { 913 scsi_cmd = (struct scsi_start_stop_unit *) 914 &done_ccb->csio.cdb_io.cdb_bytes; 915 916 if (scsi_cmd->opcode == START_STOP_UNIT) 917 xpt_async(AC_INQ_CHANGED, 918 done_ccb->ccb_h.path, NULL); 919 } 920 bcopy(done_ccb->ccb_h.saved_ccb_ptr, done_ccb, 921 sizeof(union ccb)); 922 923 periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG; 924 925 xpt_action(done_ccb); 926 927 break; 928 case CAM_SCSI_STATUS_ERROR: 929 scsi_cmd = (struct scsi_start_stop_unit *) 930 &done_ccb->csio.cdb_io.cdb_bytes; 931 if (sense != 0) { 932 struct scsi_sense_data *sense; 933 int error_code, sense_key, asc, ascq; 934 935 sense = &done_ccb->csio.sense_data; 936 scsi_extract_sense(sense, &error_code, 937 &sense_key, &asc, &ascq); 938 939 /* 940 * If the error is "invalid field in CDB", 941 * and the load/eject flag is set, turn the 942 * flag off and try again. This is just in 943 * case the drive in question barfs on the 944 * load eject flag. The CAM code should set 945 * the load/eject flag by default for 946 * removable media. 947 */ 948 949 /* XXX KDM 950 * Should we check to see what the specific 951 * scsi status is?? Or does it not matter 952 * since we already know that there was an 953 * error, and we know what the specific 954 * error code was, and we know what the 955 * opcode is.. 956 */ 957 if ((scsi_cmd->opcode == START_STOP_UNIT) && 958 ((scsi_cmd->how & SSS_LOEJ) != 0) && 959 (asc == 0x24) && (ascq == 0x00) && 960 (done_ccb->ccb_h.retry_count > 0)) { 961 962 scsi_cmd->how &= ~SSS_LOEJ; 963 964 xpt_action(done_ccb); 965 966 } else if (done_ccb->ccb_h.retry_count > 0) { 967 /* 968 * In this case, the error recovery 969 * command failed, but we've got 970 * some retries left on it. Give 971 * it another try. 972 */ 973 974 /* set the timeout to .5 sec */ 975 relsim_flags = 976 RELSIM_RELEASE_AFTER_TIMEOUT; 977 timeout = 500; 978 979 xpt_action(done_ccb); 980 981 break; 982 983 } else { 984 /* 985 * Copy the original CCB back and 986 * send it back to the caller. 987 */ 988 bcopy(done_ccb->ccb_h.saved_ccb_ptr, 989 done_ccb, sizeof(union ccb)); 990 991 periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG; 992 993 xpt_action(done_ccb); 994 } 995 } else { 996 /* 997 * Eh?? The command failed, but we don't 998 * have any sense. What's up with that? 999 * Fire the CCB again to return it to the 1000 * caller. 1001 */ 1002 bcopy(done_ccb->ccb_h.saved_ccb_ptr, 1003 done_ccb, sizeof(union ccb)); 1004 1005 periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG; 1006 1007 xpt_action(done_ccb); 1008 1009 } 1010 break; 1011 default: 1012 bcopy(done_ccb->ccb_h.saved_ccb_ptr, done_ccb, 1013 sizeof(union ccb)); 1014 1015 periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG; 1016 1017 xpt_action(done_ccb); 1018 1019 break; 1020 } 1021 1022 /* decrement the retry count */ 1023 if (done_ccb->ccb_h.retry_count > 0) 1024 done_ccb->ccb_h.retry_count--; 1025 1026 qfrozen_cnt = cam_release_devq(done_ccb->ccb_h.path, 1027 /*relsim_flags*/relsim_flags, 1028 /*openings*/0, 1029 /*timeout*/timeout, 1030 /*getcount_only*/0); 1031} 1032 1033/* 1034 * Generic Async Event handler. Peripheral drivers usually 1035 * filter out the events that require personal attention, 1036 * and leave the rest to this function. 1037 */ 1038void 1039cam_periph_async(struct cam_periph *periph, u_int32_t code, 1040 struct cam_path *path, void *arg) 1041{ 1042 switch (code) { 1043 case AC_LOST_DEVICE: 1044 cam_periph_invalidate(periph); 1045 break; 1046 case AC_SENT_BDR: 1047 case AC_BUS_RESET: 1048 { 1049 cam_periph_bus_settle(periph, SCSI_DELAY); 1050 break; 1051 } 1052 default: 1053 break; 1054 } 1055} 1056 1057void 1058cam_periph_bus_settle(struct cam_periph *periph, u_int bus_settle) 1059{ 1060 struct ccb_getdevstats cgds; 1061 1062 xpt_setup_ccb(&cgds.ccb_h, periph->path, /*priority*/1); 1063 cgds.ccb_h.func_code = XPT_GDEV_STATS; 1064 xpt_action((union ccb *)&cgds); 1065 cam_periph_freeze_after_event(periph, &cgds.last_reset, bus_settle); 1066} 1067 1068void 1069cam_periph_freeze_after_event(struct cam_periph *periph, 1070 struct timeval* event_time, u_int duration_ms) 1071{ 1072 struct timeval delta; 1073 struct timeval duration_tv; 1074 int s; 1075 1076 s = splclock(); 1077 microtime(&delta); 1078 splx(s); 1079 timevalsub(&delta, event_time); 1080 duration_tv.tv_sec = duration_ms / 1000; 1081 duration_tv.tv_usec = (duration_ms % 1000) * 1000; 1082 if (timevalcmp(&delta, &duration_tv, <)) { 1083 timevalsub(&duration_tv, &delta); 1084 1085 duration_ms = duration_tv.tv_sec * 1000; 1086 duration_ms += duration_tv.tv_usec / 1000; 1087 cam_freeze_devq(periph->path); 1088 cam_release_devq(periph->path, 1089 RELSIM_RELEASE_AFTER_TIMEOUT, 1090 /*reduction*/0, 1091 /*timeout*/duration_ms, 1092 /*getcount_only*/0); 1093 } 1094 1095} 1096 1097/* 1098 * Generic error handler. Peripheral drivers usually filter 1099 * out the errors that they handle in a unique mannor, then 1100 * call this function. 1101 */ 1102int 1103cam_periph_error(union ccb *ccb, cam_flags camflags, 1104 u_int32_t sense_flags, union ccb *save_ccb) 1105{ 1106 cam_status status; 1107 int frozen; 1108 int sense; 1109 int error; 1110 int openings; 1111 int retry; 1112 u_int32_t relsim_flags; 1113 u_int32_t timeout; 1114 1115 status = ccb->ccb_h.status; 1116 frozen = (status & CAM_DEV_QFRZN) != 0; 1117 sense = (status & CAM_AUTOSNS_VALID) != 0; 1118 status &= CAM_STATUS_MASK; 1119 relsim_flags = 0; 1120 1121 switch (status) { 1122 case CAM_REQ_CMP: 1123 /* decrement the number of retries */ 1124 retry = ccb->ccb_h.retry_count > 0; 1125 if (retry) 1126 ccb->ccb_h.retry_count--; 1127 error = 0; 1128 break; 1129 case CAM_AUTOSENSE_FAIL: 1130 case CAM_SCSI_STATUS_ERROR: 1131 1132 switch (ccb->csio.scsi_status) { 1133 case SCSI_STATUS_OK: 1134 case SCSI_STATUS_COND_MET: 1135 case SCSI_STATUS_INTERMED: 1136 case SCSI_STATUS_INTERMED_COND_MET: 1137 error = 0; 1138 break; 1139 case SCSI_STATUS_CMD_TERMINATED: 1140 case SCSI_STATUS_CHECK_COND: 1141 if (sense != 0) { 1142 struct scsi_sense_data *sense; 1143 int error_code, sense_key, asc, ascq; 1144 struct cam_periph *periph; 1145 scsi_sense_action err_action; 1146 struct ccb_getdev cgd; 1147 1148 sense = &ccb->csio.sense_data; 1149 scsi_extract_sense(sense, &error_code, 1150 &sense_key, &asc, &ascq); 1151 periph = xpt_path_periph(ccb->ccb_h.path); 1152 1153 /* 1154 * Grab the inquiry data for this device. 1155 */ 1156 xpt_setup_ccb(&cgd.ccb_h, ccb->ccb_h.path, 1157 /*priority*/ 1); 1158 cgd.ccb_h.func_code = XPT_GDEV_TYPE; 1159 xpt_action((union ccb *)&cgd); 1160 1161 err_action = scsi_error_action(asc, ascq, 1162 &cgd.inq_data); 1163 1164 /* 1165 * Send a Test Unit Ready to the device. 1166 * If the 'many' flag is set, we send 120 1167 * test unit ready commands, one every half 1168 * second. Otherwise, we just send one TUR. 1169 * We only want to do this if the retry 1170 * count has not been exhausted. 1171 */ 1172 if (((err_action & SS_MASK) == SS_TUR) 1173 && save_ccb != NULL 1174 && ccb->ccb_h.retry_count > 0) { 1175 1176 /* 1177 * Since error recovery is already 1178 * in progress, don't attempt to 1179 * process this error. It is probably 1180 * related to the error that caused 1181 * the currently active error recovery 1182 * action. Also, we only have 1183 * space for one saved CCB, so if we 1184 * had two concurrent error recovery 1185 * actions, we would end up 1186 * over-writing one error recovery 1187 * CCB with another one. 1188 */ 1189 if (periph->flags & 1190 CAM_PERIPH_RECOVERY_INPROG) { 1191 error = ERESTART; 1192 break; 1193 } 1194 1195 periph->flags |= 1196 CAM_PERIPH_RECOVERY_INPROG; 1197 1198 /* decrement the number of retries */ 1199 if ((err_action & 1200 SSQ_DECREMENT_COUNT) != 0) { 1201 retry = 1; 1202 ccb->ccb_h.retry_count--; 1203 } 1204 1205 bcopy(ccb, save_ccb, sizeof(*save_ccb)); 1206 1207 /* 1208 * We retry this one every half 1209 * second for a minute. If the 1210 * device hasn't become ready in a 1211 * minute's time, it's unlikely to 1212 * ever become ready. If the table 1213 * doesn't specify SSQ_MANY, we can 1214 * only try this once. Oh well. 1215 */ 1216 if ((err_action & SSQ_MANY) != 0) 1217 scsi_test_unit_ready(&ccb->csio, 1218 /*retries*/120, 1219 camperiphdone, 1220 MSG_SIMPLE_Q_TAG, 1221 SSD_FULL_SIZE, 1222 /*timeout*/5000); 1223 else 1224 scsi_test_unit_ready(&ccb->csio, 1225 /*retries*/1, 1226 camperiphdone, 1227 MSG_SIMPLE_Q_TAG, 1228 SSD_FULL_SIZE, 1229 /*timeout*/5000); 1230 1231 /* release the queue after .5 sec. */ 1232 relsim_flags = 1233 RELSIM_RELEASE_AFTER_TIMEOUT; 1234 timeout = 500; 1235 /* 1236 * Drop the priority to 0 so that 1237 * we are the first to execute. Also 1238 * freeze the queue after this command 1239 * is sent so that we can restore the 1240 * old csio and have it queued in the 1241 * proper order before we let normal 1242 * transactions go to the drive. 1243 */ 1244 ccb->ccb_h.pinfo.priority = 0; 1245 ccb->ccb_h.flags |= CAM_DEV_QFREEZE; 1246 1247 /* 1248 * Save a pointer to the original 1249 * CCB in the new CCB. 1250 */ 1251 ccb->ccb_h.saved_ccb_ptr = save_ccb; 1252 1253 error = ERESTART; 1254 } 1255 /* 1256 * Send a start unit command to the device, 1257 * and then retry the command. We only 1258 * want to do this if the retry count has 1259 * not been exhausted. If the user 1260 * specified 0 retries, then we follow 1261 * their request and do not retry. 1262 */ 1263 else if (((err_action & SS_MASK) == SS_START) 1264 && save_ccb != NULL 1265 && ccb->ccb_h.retry_count > 0) { 1266 int le; 1267 1268 /* 1269 * Only one error recovery action 1270 * at a time. See above. 1271 */ 1272 if (periph->flags & 1273 CAM_PERIPH_RECOVERY_INPROG) { 1274 error = ERESTART; 1275 break; 1276 } 1277 1278 periph->flags |= 1279 CAM_PERIPH_RECOVERY_INPROG; 1280 1281 /* decrement the number of retries */ 1282 retry = 1; 1283 ccb->ccb_h.retry_count--; 1284 1285 /* 1286 * Check for removable media and 1287 * set load/eject flag 1288 * appropriately. 1289 */ 1290 if (SID_IS_REMOVABLE(&cgd.inq_data)) 1291 le = TRUE; 1292 else 1293 le = FALSE; 1294 1295 /* 1296 * Attempt to start the drive up. 1297 * 1298 * Save the current ccb so it can 1299 * be restored and retried once the 1300 * drive is started up. 1301 */ 1302 bcopy(ccb, save_ccb, sizeof(*save_ccb)); 1303 1304 scsi_start_stop(&ccb->csio, 1305 /*retries*/1, 1306 camperiphdone, 1307 MSG_SIMPLE_Q_TAG, 1308 /*start*/TRUE, 1309 /*load/eject*/le, 1310 /*immediate*/FALSE, 1311 SSD_FULL_SIZE, 1312 /*timeout*/50000); 1313 /* 1314 * Drop the priority to 0 so that 1315 * we are the first to execute. Also 1316 * freeze the queue after this command 1317 * is sent so that we can restore the 1318 * old csio and have it queued in the 1319 * proper order before we let normal 1320 * transactions go to the drive. 1321 */ 1322 ccb->ccb_h.pinfo.priority = 0; 1323 ccb->ccb_h.flags |= CAM_DEV_QFREEZE; 1324 1325 /* 1326 * Save a pointer to the original 1327 * CCB in the new CCB. 1328 */ 1329 ccb->ccb_h.saved_ccb_ptr = save_ccb; 1330 1331 error = ERESTART; 1332 } else if ((sense_flags & SF_RETRY_UA) != 0) { 1333 /* 1334 * XXX KDM this is a *horrible* 1335 * hack. 1336 */ 1337 error = scsi_interpret_sense(ccb, 1338 sense_flags, 1339 &relsim_flags, 1340 &openings, 1341 &timeout, 1342 err_action); 1343 } 1344 1345 /* 1346 * Theoretically, this code should send a 1347 * test unit ready to the given device, and 1348 * if it returns and error, send a start 1349 * unit command. Since we don't yet have 1350 * the capability to do two-command error 1351 * recovery, just send a start unit. 1352 * XXX KDM fix this! 1353 */ 1354 else if (((err_action & SS_MASK) == SS_TURSTART) 1355 && save_ccb != NULL 1356 && ccb->ccb_h.retry_count > 0) { 1357 int le; 1358 1359 /* 1360 * Only one error recovery action 1361 * at a time. See above. 1362 */ 1363 if (periph->flags & 1364 CAM_PERIPH_RECOVERY_INPROG) { 1365 error = ERESTART; 1366 break; 1367 } 1368 1369 periph->flags |= 1370 CAM_PERIPH_RECOVERY_INPROG; 1371 1372 /* decrement the number of retries */ 1373 retry = 1; 1374 ccb->ccb_h.retry_count--; 1375 1376 /* 1377 * Check for removable media and 1378 * set load/eject flag 1379 * appropriately. 1380 */ 1381 if (SID_IS_REMOVABLE(&cgd.inq_data)) 1382 le = TRUE; 1383 else 1384 le = FALSE; 1385 1386 /* 1387 * Attempt to start the drive up. 1388 * 1389 * Save the current ccb so it can 1390 * be restored and retried once the 1391 * drive is started up. 1392 */ 1393 bcopy(ccb, save_ccb, sizeof(*save_ccb)); 1394 1395 scsi_start_stop(&ccb->csio, 1396 /*retries*/1, 1397 camperiphdone, 1398 MSG_SIMPLE_Q_TAG, 1399 /*start*/TRUE, 1400 /*load/eject*/le, 1401 /*immediate*/FALSE, 1402 SSD_FULL_SIZE, 1403 /*timeout*/50000); 1404 1405 /* release the queue after .5 sec. */ 1406 relsim_flags = 1407 RELSIM_RELEASE_AFTER_TIMEOUT; 1408 timeout = 500; 1409 /* 1410 * Drop the priority to 0 so that 1411 * we are the first to execute. Also 1412 * freeze the queue after this command 1413 * is sent so that we can restore the 1414 * old csio and have it queued in the 1415 * proper order before we let normal 1416 * transactions go to the drive. 1417 */ 1418 ccb->ccb_h.pinfo.priority = 0; 1419 ccb->ccb_h.flags |= CAM_DEV_QFREEZE; 1420 1421 /* 1422 * Save a pointer to the original 1423 * CCB in the new CCB. 1424 */ 1425 ccb->ccb_h.saved_ccb_ptr = save_ccb; 1426 1427 error = ERESTART; 1428 } else { 1429 error = scsi_interpret_sense(ccb, 1430 sense_flags, 1431 &relsim_flags, 1432 &openings, 1433 &timeout, 1434 err_action); 1435 } 1436 } else if (ccb->csio.scsi_status == 1437 SCSI_STATUS_CHECK_COND 1438 && status != CAM_AUTOSENSE_FAIL) { 1439 /* no point in decrementing the retry count */ 1440 panic("cam_periph_error: scsi status of " 1441 "CHECK COND returned but no sense " 1442 "information is availible. " 1443 "Controller should have returned " 1444 "CAM_AUTOSENSE_FAILED"); 1445 /* NOTREACHED */ 1446 error = EIO; 1447 } else if (ccb->ccb_h.retry_count == 0) { 1448 /* 1449 * XXX KDM shouldn't there be a better 1450 * argument to return?? 1451 */ 1452 error = EIO; 1453 } else { 1454 /* decrement the number of retries */ 1455 retry = ccb->ccb_h.retry_count > 0; 1456 if (retry) 1457 ccb->ccb_h.retry_count--; 1458 /* 1459 * If it was aborted with no 1460 * clue as to the reason, just 1461 * retry it again. 1462 */ 1463 error = ERESTART; 1464 } 1465 break; 1466 case SCSI_STATUS_QUEUE_FULL: 1467 { 1468 /* no decrement */ 1469 struct ccb_getdevstats cgds; 1470 1471 /* 1472 * First off, find out what the current 1473 * transaction counts are. 1474 */ 1475 xpt_setup_ccb(&cgds.ccb_h, 1476 ccb->ccb_h.path, 1477 /*priority*/1); 1478 cgds.ccb_h.func_code = XPT_GDEV_STATS; 1479 xpt_action((union ccb *)&cgds); 1480 1481 /* 1482 * If we were the only transaction active, treat 1483 * the QUEUE FULL as if it were a BUSY condition. 1484 */ 1485 if (cgds.dev_active != 0) { 1486 int total_openings; 1487 1488 /* 1489 * Reduce the number of openings to 1490 * be 1 less than the amount it took 1491 * to get a queue full bounded by the 1492 * minimum allowed tag count for this 1493 * device. 1494 */ 1495 total_openings = 1496 cgds.dev_active+cgds.dev_openings; 1497 openings = cgds.dev_active; 1498 if (openings < cgds.mintags) 1499 openings = cgds.mintags; 1500 if (openings < total_openings) 1501 relsim_flags = RELSIM_ADJUST_OPENINGS; 1502 else { 1503 /* 1504 * Some devices report queue full for 1505 * temporary resource shortages. For 1506 * this reason, we allow a minimum 1507 * tag count to be entered via a 1508 * quirk entry to prevent the queue 1509 * count on these devices from falling 1510 * to a pessimisticly low value. We 1511 * still wait for the next successful 1512 * completion, however, before queueing 1513 * more transactions to the device. 1514 */ 1515 relsim_flags = 1516 RELSIM_RELEASE_AFTER_CMDCMPLT; 1517 } 1518 timeout = 0; 1519 error = ERESTART; 1520 break; 1521 } 1522 /* FALLTHROUGH */ 1523 } 1524 case SCSI_STATUS_BUSY: 1525 /* 1526 * Restart the queue after either another 1527 * command completes or a 1 second timeout. 1528 * If we have any retries left, that is. 1529 */ 1530 retry = ccb->ccb_h.retry_count > 0; 1531 if (retry) { 1532 ccb->ccb_h.retry_count--; 1533 error = ERESTART; 1534 relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT 1535 | RELSIM_RELEASE_AFTER_CMDCMPLT; 1536 timeout = 1000; 1537 } else { 1538 error = EIO; 1539 } 1540 break; 1541 case SCSI_STATUS_RESERV_CONFLICT: 1542 error = EIO; 1543 break; 1544 default: 1545 error = EIO; 1546 break; 1547 } 1548 break; 1549 case CAM_REQ_CMP_ERR: 1550 case CAM_CMD_TIMEOUT: 1551 case CAM_UNEXP_BUSFREE: 1552 case CAM_UNCOR_PARITY: 1553 case CAM_DATA_RUN_ERR: 1554 /* decrement the number of retries */ 1555 retry = ccb->ccb_h.retry_count > 0; 1556 if (retry) { 1557 ccb->ccb_h.retry_count--; 1558 error = ERESTART; 1559 } else { 1560 error = EIO; 1561 } 1562 break; 1563 case CAM_UA_ABORT: 1564 case CAM_UA_TERMIO: 1565 case CAM_MSG_REJECT_REC: 1566 /* XXX Don't know that these are correct */ 1567 error = EIO; 1568 break; 1569 case CAM_SEL_TIMEOUT: 1570 { 1571 /* 1572 * XXX 1573 * A single selection timeout should not be enough 1574 * to invalidate a device. We should retry for multiple 1575 * seconds assuming this isn't a probe. We'll probably 1576 * need a special flag for that. 1577 */ 1578#if 0 1579 struct cam_path *newpath; 1580 1581 /* Should we do more if we can't create the path?? */ 1582 if (xpt_create_path(&newpath, xpt_path_periph(ccb->ccb_h.path), 1583 xpt_path_path_id(ccb->ccb_h.path), 1584 xpt_path_target_id(ccb->ccb_h.path), 1585 CAM_LUN_WILDCARD) != CAM_REQ_CMP) 1586 break; 1587 /* 1588 * Let peripheral drivers know that this device has gone 1589 * away. 1590 */ 1591 xpt_async(AC_LOST_DEVICE, newpath, NULL); 1592 xpt_free_path(newpath); 1593#endif 1594 if ((sense_flags & SF_RETRY_SELTO) != 0) { 1595 retry = ccb->ccb_h.retry_count > 0; 1596 if (retry) { 1597 ccb->ccb_h.retry_count--; 1598 error = ERESTART; 1599 /* 1600 * Wait half a second to give the device 1601 * time to recover before we try again. 1602 */ 1603 relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT; 1604 timeout = 500; 1605 } else { 1606 error = ENXIO; 1607 } 1608 } else { 1609 error = ENXIO; 1610 } 1611 break; 1612 } 1613 case CAM_REQ_INVALID: 1614 case CAM_PATH_INVALID: 1615 case CAM_DEV_NOT_THERE: 1616 case CAM_NO_HBA: 1617 case CAM_PROVIDE_FAIL: 1618 case CAM_REQ_TOO_BIG: 1619 error = EINVAL; 1620 break; 1621 case CAM_SCSI_BUS_RESET: 1622 case CAM_BDR_SENT: 1623 case CAM_REQUEUE_REQ: 1624 /* Unconditional requeue, dammit */ 1625 error = ERESTART; 1626 break; 1627 case CAM_RESRC_UNAVAIL: 1628 case CAM_BUSY: 1629 /* timeout??? */ 1630 default: 1631 /* decrement the number of retries */ 1632 retry = ccb->ccb_h.retry_count > 0; 1633 if (retry) { 1634 ccb->ccb_h.retry_count--; 1635 error = ERESTART; 1636 } else { 1637 /* Check the sense codes */ 1638 error = EIO; 1639 } 1640 break; 1641 } 1642 1643 /* Attempt a retry */ 1644 if (error == ERESTART || error == 0) { 1645 if (frozen != 0) 1646 ccb->ccb_h.status &= ~CAM_DEV_QFRZN; 1647 1648 if (error == ERESTART) 1649 xpt_action(ccb); 1650 1651 if (frozen != 0) { 1652 cam_release_devq(ccb->ccb_h.path, 1653 relsim_flags, 1654 openings, 1655 timeout, 1656 /*getcount_only*/0); 1657 } 1658 } 1659 1660 1661 return (error); 1662} 1663