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: src/sys/cam/cam_periph.c,v 1.24.2.3 2003/01/25 19:04:40 dillon Exp $ 30 * $DragonFly: src/sys/bus/cam/cam_periph.c,v 1.18 2006/12/22 23:12:16 swildner Exp $ 31 */ 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/types.h> 36 #include <sys/malloc.h> 37 #include <sys/linker_set.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 <sys/thread2.h> 46 47 #include "cam.h" 48 #include "cam_ccb.h" 49 #include "cam_xpt_periph.h" 50 #include "cam_periph.h" 51 #include "cam_debug.h" 52 53 #include <bus/cam/scsi/scsi_all.h> 54 #include <bus/cam/scsi/scsi_message.h> 55 #include <bus/cam/scsi/scsi_da.h> 56 #include <bus/cam/scsi/scsi_pass.h> 57 58 static u_int camperiphnextunit(struct periph_driver *p_drv, 59 u_int newunit, int wired, 60 path_id_t pathid, target_id_t target, 61 lun_id_t lun); 62 static u_int camperiphunit(struct periph_driver *p_drv, 63 path_id_t pathid, target_id_t target, 64 lun_id_t lun); 65 static void camperiphdone(struct cam_periph *periph, 66 union ccb *done_ccb); 67 static void camperiphfree(struct cam_periph *periph); 68 69 cam_status 70 cam_periph_alloc(periph_ctor_t *periph_ctor, 71 periph_oninv_t *periph_oninvalidate, 72 periph_dtor_t *periph_dtor, periph_start_t *periph_start, 73 char *name, cam_periph_type type, struct cam_path *path, 74 ac_callback_t *ac_callback, ac_code code, void *arg) 75 { 76 struct periph_driver **p_drv; 77 struct cam_periph *periph; 78 struct cam_periph *cur_periph; 79 path_id_t path_id; 80 target_id_t target_id; 81 lun_id_t lun_id; 82 cam_status status; 83 u_int init_level; 84 85 init_level = 0; 86 /* 87 * Handle Hot-Plug scenarios. If there is already a peripheral 88 * of our type assigned to this path, we are likely waiting for 89 * final close on an old, invalidated, peripheral. If this is 90 * the case, queue up a deferred call to the peripheral's async 91 * handler. If it looks like a mistaken re-alloation, complain. 92 */ 93 if ((periph = cam_periph_find(path, name)) != NULL) { 94 95 if ((periph->flags & CAM_PERIPH_INVALID) != 0 96 && (periph->flags & CAM_PERIPH_NEW_DEV_FOUND) == 0) { 97 periph->flags |= CAM_PERIPH_NEW_DEV_FOUND; 98 periph->deferred_callback = ac_callback; 99 periph->deferred_ac = code; 100 return (CAM_REQ_INPROG); 101 } else { 102 kprintf("cam_periph_alloc: attempt to re-allocate " 103 "valid device %s%d rejected\n", 104 periph->periph_name, periph->unit_number); 105 } 106 return (CAM_REQ_INVALID); 107 } 108 109 periph = kmalloc(sizeof(*periph), M_DEVBUF, M_INTWAIT | M_ZERO); 110 111 init_level++; 112 113 SET_FOREACH(p_drv, periphdriver_set) { 114 if (strcmp((*p_drv)->driver_name, name) == 0) 115 break; 116 } 117 118 path_id = xpt_path_path_id(path); 119 target_id = xpt_path_target_id(path); 120 lun_id = xpt_path_lun_id(path); 121 cam_init_pinfo(&periph->pinfo); 122 periph->periph_start = periph_start; 123 periph->periph_dtor = periph_dtor; 124 periph->periph_oninval = periph_oninvalidate; 125 periph->type = type; 126 periph->periph_name = name; 127 periph->unit_number = camperiphunit(*p_drv, path_id, target_id, lun_id); 128 periph->immediate_priority = CAM_PRIORITY_NONE; 129 periph->refcount = 0; 130 SLIST_INIT(&periph->ccb_list); 131 status = xpt_create_path(&path, periph, path_id, target_id, lun_id); 132 if (status != CAM_REQ_CMP) 133 goto failure; 134 135 periph->path = path; 136 init_level++; 137 138 status = xpt_add_periph(periph); 139 140 if (status != CAM_REQ_CMP) 141 goto failure; 142 143 crit_enter(); 144 cur_periph = TAILQ_FIRST(&(*p_drv)->units); 145 while (cur_periph != NULL 146 && cur_periph->unit_number < periph->unit_number) 147 cur_periph = TAILQ_NEXT(cur_periph, unit_links); 148 149 if (cur_periph != NULL) 150 TAILQ_INSERT_BEFORE(cur_periph, periph, unit_links); 151 else { 152 TAILQ_INSERT_TAIL(&(*p_drv)->units, periph, unit_links); 153 (*p_drv)->generation++; 154 } 155 156 crit_exit(); 157 158 init_level++; 159 160 status = periph_ctor(periph, arg); 161 162 if (status == CAM_REQ_CMP) 163 init_level++; 164 165 failure: 166 switch (init_level) { 167 case 4: 168 /* Initialized successfully */ 169 break; 170 case 3: 171 crit_enter(); 172 TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links); 173 crit_exit(); 174 xpt_remove_periph(periph); 175 case 2: 176 xpt_free_path(periph->path); 177 case 1: 178 kfree(periph, M_DEVBUF); 179 case 0: 180 /* No cleanup to perform. */ 181 break; 182 default: 183 panic("cam_periph_alloc: Unkown init level"); 184 } 185 return(status); 186 } 187 188 /* 189 * Find a peripheral structure with the specified path, target, lun, 190 * and (optionally) type. If the name is NULL, this function will return 191 * the first peripheral driver that matches the specified path. 192 */ 193 struct cam_periph * 194 cam_periph_find(struct cam_path *path, char *name) 195 { 196 struct periph_driver **p_drv; 197 struct cam_periph *periph; 198 199 SET_FOREACH(p_drv, periphdriver_set) { 200 if (name != NULL && (strcmp((*p_drv)->driver_name, name) != 0)) 201 continue; 202 203 crit_enter(); 204 for (periph = TAILQ_FIRST(&(*p_drv)->units); periph != NULL; 205 periph = TAILQ_NEXT(periph, unit_links)) { 206 if (xpt_path_comp(periph->path, path) == 0) { 207 crit_exit(); 208 return(periph); 209 } 210 } 211 crit_exit(); 212 if (name != NULL) 213 return(NULL); 214 } 215 return(NULL); 216 } 217 218 cam_status 219 cam_periph_acquire(struct cam_periph *periph) 220 { 221 if (periph == NULL) 222 return(CAM_REQ_CMP_ERR); 223 224 crit_enter(); 225 periph->refcount++; 226 crit_exit(); 227 228 return(CAM_REQ_CMP); 229 } 230 231 void 232 cam_periph_release(struct cam_periph *periph) 233 { 234 if (periph == NULL) 235 return; 236 237 crit_enter(); 238 if ((--periph->refcount == 0) 239 && (periph->flags & CAM_PERIPH_INVALID)) { 240 camperiphfree(periph); 241 } 242 crit_exit(); 243 } 244 245 /* 246 * Look for the next unit number that is not currently in use for this 247 * peripheral type starting at "newunit". Also exclude unit numbers that 248 * are reserved by for future "hardwiring" unless we already know that this 249 * is a potential wired device. Only assume that the device is "wired" the 250 * first time through the loop since after that we'll be looking at unit 251 * numbers that did not match a wiring entry. 252 */ 253 static u_int 254 camperiphnextunit(struct periph_driver *p_drv, u_int newunit, int wired, 255 path_id_t pathid, target_id_t target, lun_id_t lun) 256 { 257 struct cam_periph *periph; 258 char *periph_name, *strval; 259 int i, val, dunit; 260 const char *dname; 261 262 crit_enter(); 263 periph_name = p_drv->driver_name; 264 for (;;newunit++) { 265 266 for (periph = TAILQ_FIRST(&p_drv->units); 267 periph != NULL && periph->unit_number != newunit; 268 periph = TAILQ_NEXT(periph, unit_links)) 269 ; 270 271 if (periph != NULL && periph->unit_number == newunit) { 272 if (wired != 0) { 273 xpt_print_path(periph->path); 274 kprintf("Duplicate Wired Device entry!\n"); 275 xpt_print_path(periph->path); 276 kprintf("Second device (%s device at scbus%d " 277 "target %d lun %d) will not be wired\n", 278 periph_name, pathid, target, lun); 279 wired = 0; 280 } 281 continue; 282 } 283 if (wired) 284 break; 285 286 /* 287 * Don't match entries like "da 4" as a wired down 288 * device, but do match entries like "da 4 target 5" 289 * or even "da 4 scbus 1". 290 */ 291 i = -1; 292 while ((i = resource_locate(i, periph_name)) != -1) { 293 dname = resource_query_name(i); 294 dunit = resource_query_unit(i); 295 /* if no "target" and no specific scbus, skip */ 296 if (resource_int_value(dname, dunit, "target", &val) && 297 (resource_string_value(dname, dunit, "at",&strval)|| 298 strcmp(strval, "scbus") == 0)) 299 continue; 300 if (newunit == dunit) 301 break; 302 } 303 if (i == -1) 304 break; 305 } 306 crit_exit(); 307 return (newunit); 308 } 309 310 static u_int 311 camperiphunit(struct periph_driver *p_drv, path_id_t pathid, 312 target_id_t target, lun_id_t lun) 313 { 314 u_int unit; 315 int hit, i, val, dunit; 316 const char *dname; 317 char pathbuf[32], *strval, *periph_name; 318 319 unit = 0; 320 321 periph_name = p_drv->driver_name; 322 ksnprintf(pathbuf, sizeof(pathbuf), "scbus%d", pathid); 323 i = -1; 324 for (hit = 0; (i = resource_locate(i, periph_name)) != -1; hit = 0) { 325 dname = resource_query_name(i); 326 dunit = resource_query_unit(i); 327 if (resource_string_value(dname, dunit, "at", &strval) == 0) { 328 if (strcmp(strval, pathbuf) != 0) 329 continue; 330 hit++; 331 } 332 if (resource_int_value(dname, dunit, "target", &val) == 0) { 333 if (val != target) 334 continue; 335 hit++; 336 } 337 if (resource_int_value(dname, dunit, "lun", &val) == 0) { 338 if (val != lun) 339 continue; 340 hit++; 341 } 342 if (hit != 0) { 343 unit = dunit; 344 break; 345 } 346 } 347 348 /* 349 * Either start from 0 looking for the next unit or from 350 * the unit number given in the resource config. This way, 351 * if we have wildcard matches, we don't return the same 352 * unit number twice. 353 */ 354 unit = camperiphnextunit(p_drv, unit, /*wired*/hit, pathid, 355 target, lun); 356 357 return (unit); 358 } 359 360 void 361 cam_periph_invalidate(struct cam_periph *periph) 362 { 363 /* 364 * We only call this routine the first time a peripheral is 365 * invalidated. The oninvalidate() routine is always called in 366 * a critical section. 367 */ 368 crit_enter(); 369 if (((periph->flags & CAM_PERIPH_INVALID) == 0) 370 && (periph->periph_oninval != NULL)) 371 periph->periph_oninval(periph); 372 373 periph->flags |= CAM_PERIPH_INVALID; 374 periph->flags &= ~CAM_PERIPH_NEW_DEV_FOUND; 375 376 if (periph->refcount == 0) 377 camperiphfree(periph); 378 else if (periph->refcount < 0) 379 kprintf("cam_invalidate_periph: refcount < 0!!\n"); 380 crit_exit(); 381 } 382 383 static void 384 camperiphfree(struct cam_periph *periph) 385 { 386 struct periph_driver **p_drv; 387 388 SET_FOREACH(p_drv, periphdriver_set) { 389 if (strcmp((*p_drv)->driver_name, periph->periph_name) == 0) 390 break; 391 } 392 393 if (*p_drv == NULL) { 394 kprintf("camperiphfree: attempt to free " 395 "non-existant periph: %s\n", periph->periph_name); 396 return; 397 } 398 399 if (periph->periph_dtor != NULL) 400 periph->periph_dtor(periph); 401 402 crit_enter(); 403 TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links); 404 (*p_drv)->generation++; 405 crit_exit(); 406 407 xpt_remove_periph(periph); 408 409 if (periph->flags & CAM_PERIPH_NEW_DEV_FOUND) { 410 union ccb ccb; 411 void *arg; 412 413 switch (periph->deferred_ac) { 414 case AC_FOUND_DEVICE: 415 ccb.ccb_h.func_code = XPT_GDEV_TYPE; 416 xpt_setup_ccb(&ccb.ccb_h, periph->path, /*priority*/ 1); 417 xpt_action(&ccb); 418 arg = &ccb; 419 break; 420 case AC_PATH_REGISTERED: 421 ccb.ccb_h.func_code = XPT_PATH_INQ; 422 xpt_setup_ccb(&ccb.ccb_h, periph->path, /*priority*/ 1); 423 xpt_action(&ccb); 424 arg = &ccb; 425 break; 426 default: 427 arg = NULL; 428 break; 429 } 430 periph->deferred_callback(NULL, periph->deferred_ac, 431 periph->path, arg); 432 } 433 xpt_free_path(periph->path); 434 kfree(periph, M_DEVBUF); 435 } 436 437 /* 438 * Wait interruptibly for an exclusive lock. 439 */ 440 int 441 cam_periph_lock(struct cam_periph *periph, int flags) 442 { 443 int error; 444 445 while ((periph->flags & CAM_PERIPH_LOCKED) != 0) { 446 periph->flags |= CAM_PERIPH_LOCK_WANTED; 447 if ((error = tsleep(periph, flags, "caplck", 0)) != 0) 448 return error; 449 } 450 451 if (cam_periph_acquire(periph) != CAM_REQ_CMP) 452 return(ENXIO); 453 454 periph->flags |= CAM_PERIPH_LOCKED; 455 return 0; 456 } 457 458 /* 459 * Unlock and wake up any waiters. 460 */ 461 void 462 cam_periph_unlock(struct cam_periph *periph) 463 { 464 periph->flags &= ~CAM_PERIPH_LOCKED; 465 if ((periph->flags & CAM_PERIPH_LOCK_WANTED) != 0) { 466 periph->flags &= ~CAM_PERIPH_LOCK_WANTED; 467 wakeup(periph); 468 } 469 470 cam_periph_release(periph); 471 } 472 473 /* 474 * Map user virtual pointers into kernel virtual address space, so we can 475 * access the memory. This won't work on physical pointers, for now it's 476 * up to the caller to check for that. (XXX KDM -- should we do that here 477 * instead?) This also only works for up to MAXPHYS memory. Since we use 478 * buffers to map stuff in and out, we're limited to the buffer size. 479 */ 480 int 481 cam_periph_mapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo) 482 { 483 int numbufs, i, j; 484 buf_cmd_t cmd[CAM_PERIPH_MAXMAPS]; 485 u_int8_t **data_ptrs[CAM_PERIPH_MAXMAPS]; 486 u_int32_t lengths[CAM_PERIPH_MAXMAPS]; 487 u_int32_t dirs[CAM_PERIPH_MAXMAPS]; 488 489 switch(ccb->ccb_h.func_code) { 490 case XPT_DEV_MATCH: 491 if (ccb->cdm.match_buf_len == 0) { 492 kprintf("cam_periph_mapmem: invalid match buffer " 493 "length 0\n"); 494 return(EINVAL); 495 } 496 if (ccb->cdm.pattern_buf_len > 0) { 497 data_ptrs[0] = (u_int8_t **)&ccb->cdm.patterns; 498 lengths[0] = ccb->cdm.pattern_buf_len; 499 dirs[0] = CAM_DIR_OUT; 500 data_ptrs[1] = (u_int8_t **)&ccb->cdm.matches; 501 lengths[1] = ccb->cdm.match_buf_len; 502 dirs[1] = CAM_DIR_IN; 503 numbufs = 2; 504 } else { 505 data_ptrs[0] = (u_int8_t **)&ccb->cdm.matches; 506 lengths[0] = ccb->cdm.match_buf_len; 507 dirs[0] = CAM_DIR_IN; 508 numbufs = 1; 509 } 510 break; 511 case XPT_SCSI_IO: 512 case XPT_CONT_TARGET_IO: 513 if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_NONE) 514 return(0); 515 516 data_ptrs[0] = &ccb->csio.data_ptr; 517 lengths[0] = ccb->csio.dxfer_len; 518 dirs[0] = ccb->ccb_h.flags & CAM_DIR_MASK; 519 numbufs = 1; 520 break; 521 default: 522 return(EINVAL); 523 break; /* NOTREACHED */ 524 } 525 526 /* 527 * Check the transfer length and permissions first, so we don't 528 * have to unmap any previously mapped buffers. 529 */ 530 for (i = 0; i < numbufs; i++) { 531 /* 532 * Its kinda bogus, we need a R+W command. For now the 533 * buffer needs some sort of command. Use BUF_CMD_WRITE 534 * to indicate a write and BUF_CMD_READ to indicate R+W. 535 */ 536 cmd[i] = BUF_CMD_WRITE; 537 538 /* 539 * The userland data pointer passed in may not be page 540 * aligned. vmapbuf() truncates the address to a page 541 * boundary, so if the address isn't page aligned, we'll 542 * need enough space for the given transfer length, plus 543 * whatever extra space is necessary to make it to the page 544 * boundary. 545 */ 546 if ((lengths[i] + 547 (((vm_offset_t)(*data_ptrs[i])) & PAGE_MASK)) > DFLTPHYS){ 548 kprintf("cam_periph_mapmem: attempt to map %lu bytes, " 549 "which is greater than DFLTPHYS(%d)\n", 550 (long)(lengths[i] + 551 (((vm_offset_t)(*data_ptrs[i])) & PAGE_MASK)), 552 DFLTPHYS); 553 return(E2BIG); 554 } 555 556 if (dirs[i] & CAM_DIR_OUT) { 557 if (!useracc(*data_ptrs[i], lengths[i], 558 VM_PROT_READ)) { 559 kprintf("cam_periph_mapmem: error, " 560 "address %p, length %lu isn't " 561 "user accessible for READ\n", 562 (void *)*data_ptrs[i], 563 (u_long)lengths[i]); 564 return(EACCES); 565 } 566 } 567 568 if (dirs[i] & CAM_DIR_IN) { 569 cmd[i] = BUF_CMD_READ; 570 if (!useracc(*data_ptrs[i], lengths[i], 571 VM_PROT_WRITE)) { 572 kprintf("cam_periph_mapmem: error, " 573 "address %p, length %lu isn't " 574 "user accessible for WRITE\n", 575 (void *)*data_ptrs[i], 576 (u_long)lengths[i]); 577 578 return(EACCES); 579 } 580 } 581 582 } 583 584 for (i = 0; i < numbufs; i++) { 585 /* 586 * Get the buffer. 587 */ 588 mapinfo->bp[i] = getpbuf(NULL); 589 590 /* save the original user pointer */ 591 mapinfo->saved_ptrs[i] = *data_ptrs[i]; 592 593 /* set the flags */ 594 mapinfo->bp[i]->b_cmd = cmd[i]; 595 596 /* map the user buffer into kernel memory */ 597 if (vmapbuf(mapinfo->bp[i], *data_ptrs[i], lengths[i]) < 0) { 598 kprintf("cam_periph_mapmem: error, " 599 "address %p, length %lu isn't " 600 "user accessible any more\n", 601 (void *)*data_ptrs[i], 602 (u_long)lengths[i]); 603 for (j = 0; j < i; ++j) { 604 *data_ptrs[j] = mapinfo->saved_ptrs[j]; 605 vunmapbuf(mapinfo->bp[j]); 606 relpbuf(mapinfo->bp[j], NULL); 607 } 608 mapinfo->num_bufs_used -= i; 609 return(EACCES); 610 } 611 612 /* set our pointer to the new mapped area */ 613 *data_ptrs[i] = mapinfo->bp[i]->b_data; 614 615 mapinfo->num_bufs_used++; 616 } 617 618 return(0); 619 } 620 621 /* 622 * Unmap memory segments mapped into kernel virtual address space by 623 * cam_periph_mapmem(). 624 */ 625 void 626 cam_periph_unmapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo) 627 { 628 int numbufs, i; 629 u_int8_t **data_ptrs[CAM_PERIPH_MAXMAPS]; 630 631 if (mapinfo->num_bufs_used <= 0) { 632 /* allow ourselves to be swapped once again */ 633 return; 634 } 635 636 switch (ccb->ccb_h.func_code) { 637 case XPT_DEV_MATCH: 638 numbufs = min(mapinfo->num_bufs_used, 2); 639 640 if (numbufs == 1) { 641 data_ptrs[0] = (u_int8_t **)&ccb->cdm.matches; 642 } else { 643 data_ptrs[0] = (u_int8_t **)&ccb->cdm.patterns; 644 data_ptrs[1] = (u_int8_t **)&ccb->cdm.matches; 645 } 646 break; 647 case XPT_SCSI_IO: 648 case XPT_CONT_TARGET_IO: 649 data_ptrs[0] = &ccb->csio.data_ptr; 650 numbufs = min(mapinfo->num_bufs_used, 1); 651 break; 652 default: 653 /* allow ourselves to be swapped once again */ 654 return; 655 break; /* NOTREACHED */ 656 } 657 658 for (i = 0; i < numbufs; i++) { 659 /* Set the user's pointer back to the original value */ 660 *data_ptrs[i] = mapinfo->saved_ptrs[i]; 661 662 /* unmap the buffer */ 663 vunmapbuf(mapinfo->bp[i]); 664 665 /* release the buffer */ 666 relpbuf(mapinfo->bp[i], NULL); 667 } 668 669 /* allow ourselves to be swapped once again */ 670 } 671 672 union ccb * 673 cam_periph_getccb(struct cam_periph *periph, u_int32_t priority) 674 { 675 struct ccb_hdr *ccb_h; 676 677 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("entering cdgetccb\n")); 678 679 crit_enter(); 680 681 while (periph->ccb_list.slh_first == NULL) { 682 if (periph->immediate_priority > priority) 683 periph->immediate_priority = priority; 684 xpt_schedule(periph, priority); 685 if ((periph->ccb_list.slh_first != NULL) 686 && (periph->ccb_list.slh_first->pinfo.priority == priority)) 687 break; 688 tsleep(&periph->ccb_list, 0, "cgticb", 0); 689 } 690 691 ccb_h = periph->ccb_list.slh_first; 692 SLIST_REMOVE_HEAD(&periph->ccb_list, periph_links.sle); 693 crit_exit(); 694 return ((union ccb *)ccb_h); 695 } 696 697 void 698 cam_periph_ccbwait(union ccb *ccb) 699 { 700 crit_enter(); 701 if ((ccb->ccb_h.pinfo.index != CAM_UNQUEUED_INDEX) 702 || ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_INPROG)) 703 tsleep(&ccb->ccb_h.cbfcnp, 0, "cbwait", 0); 704 crit_exit(); 705 } 706 707 int 708 cam_periph_ioctl(struct cam_periph *periph, int cmd, caddr_t addr, 709 int (*error_routine)(union ccb *ccb, 710 cam_flags camflags, 711 u_int32_t sense_flags)) 712 { 713 union ccb *ccb; 714 int error; 715 int found; 716 717 error = found = 0; 718 719 switch(cmd){ 720 case CAMGETPASSTHRU: 721 ccb = cam_periph_getccb(periph, /* priority */ 1); 722 xpt_setup_ccb(&ccb->ccb_h, 723 ccb->ccb_h.path, 724 /*priority*/1); 725 ccb->ccb_h.func_code = XPT_GDEVLIST; 726 727 /* 728 * Basically, the point of this is that we go through 729 * getting the list of devices, until we find a passthrough 730 * device. In the current version of the CAM code, the 731 * only way to determine what type of device we're dealing 732 * with is by its name. 733 */ 734 while (found == 0) { 735 ccb->cgdl.index = 0; 736 ccb->cgdl.status = CAM_GDEVLIST_MORE_DEVS; 737 while (ccb->cgdl.status == CAM_GDEVLIST_MORE_DEVS) { 738 739 /* we want the next device in the list */ 740 xpt_action(ccb); 741 if (strncmp(ccb->cgdl.periph_name, 742 "pass", 4) == 0){ 743 found = 1; 744 break; 745 } 746 } 747 if ((ccb->cgdl.status == CAM_GDEVLIST_LAST_DEVICE) && 748 (found == 0)) { 749 ccb->cgdl.periph_name[0] = '\0'; 750 ccb->cgdl.unit_number = 0; 751 break; 752 } 753 } 754 755 /* copy the result back out */ 756 bcopy(ccb, addr, sizeof(union ccb)); 757 758 /* and release the ccb */ 759 xpt_release_ccb(ccb); 760 761 break; 762 default: 763 error = ENOTTY; 764 break; 765 } 766 return(error); 767 } 768 769 int 770 cam_periph_runccb(union ccb *ccb, 771 int (*error_routine)(union ccb *ccb, 772 cam_flags camflags, 773 u_int32_t sense_flags), 774 cam_flags camflags, u_int32_t sense_flags, 775 struct devstat *ds) 776 { 777 int error; 778 779 error = 0; 780 781 /* 782 * If the user has supplied a stats structure, and if we understand 783 * this particular type of ccb, record the transaction start. 784 */ 785 if ((ds != NULL) && (ccb->ccb_h.func_code == XPT_SCSI_IO)) 786 devstat_start_transaction(ds); 787 788 xpt_action(ccb); 789 790 do { 791 cam_periph_ccbwait(ccb); 792 if ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP) 793 error = 0; 794 else if (error_routine != NULL) 795 error = (*error_routine)(ccb, camflags, sense_flags); 796 else 797 error = 0; 798 799 } while (error == ERESTART); 800 801 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) 802 cam_release_devq(ccb->ccb_h.path, 803 /* relsim_flags */0, 804 /* openings */0, 805 /* timeout */0, 806 /* getcount_only */ FALSE); 807 808 if ((ds != NULL) && (ccb->ccb_h.func_code == XPT_SCSI_IO)) 809 devstat_end_transaction(ds, 810 ccb->csio.dxfer_len, 811 ccb->csio.tag_action & 0xf, 812 ((ccb->ccb_h.flags & CAM_DIR_MASK) == 813 CAM_DIR_NONE) ? DEVSTAT_NO_DATA : 814 (ccb->ccb_h.flags & CAM_DIR_OUT) ? 815 DEVSTAT_WRITE : 816 DEVSTAT_READ); 817 818 return(error); 819 } 820 821 void 822 cam_freeze_devq(struct cam_path *path) 823 { 824 struct ccb_hdr ccb_h; 825 826 xpt_setup_ccb(&ccb_h, path, /*priority*/1); 827 ccb_h.func_code = XPT_NOOP; 828 ccb_h.flags = CAM_DEV_QFREEZE; 829 xpt_action((union ccb *)&ccb_h); 830 } 831 832 u_int32_t 833 cam_release_devq(struct cam_path *path, u_int32_t relsim_flags, 834 u_int32_t openings, u_int32_t timeout, 835 int getcount_only) 836 { 837 struct ccb_relsim crs; 838 839 xpt_setup_ccb(&crs.ccb_h, path, 840 /*priority*/1); 841 crs.ccb_h.func_code = XPT_REL_SIMQ; 842 crs.ccb_h.flags = getcount_only ? CAM_DEV_QFREEZE : 0; 843 crs.release_flags = relsim_flags; 844 crs.openings = openings; 845 crs.release_timeout = timeout; 846 xpt_action((union ccb *)&crs); 847 return (crs.qfrozen_cnt); 848 } 849 850 #define saved_ccb_ptr ppriv_ptr0 851 static void 852 camperiphdone(struct cam_periph *periph, union ccb *done_ccb) 853 { 854 cam_status status; 855 int frozen; 856 int sense; 857 struct scsi_start_stop_unit *scsi_cmd; 858 u_int32_t relsim_flags, timeout; 859 u_int32_t qfrozen_cnt; 860 861 status = done_ccb->ccb_h.status; 862 frozen = (status & CAM_DEV_QFRZN) != 0; 863 sense = (status & CAM_AUTOSNS_VALID) != 0; 864 status &= CAM_STATUS_MASK; 865 866 timeout = 0; 867 relsim_flags = 0; 868 869 /* 870 * Unfreeze the queue once if it is already frozen.. 871 */ 872 if (frozen != 0) { 873 qfrozen_cnt = cam_release_devq(done_ccb->ccb_h.path, 874 /*relsim_flags*/0, 875 /*openings*/0, 876 /*timeout*/0, 877 /*getcount_only*/0); 878 } 879 880 switch (status) { 881 882 case CAM_REQ_CMP: 883 884 /* 885 * If we have successfully taken a device from the not 886 * ready to ready state, re-scan the device and re-get the 887 * inquiry information. Many devices (mostly disks) don't 888 * properly report their inquiry information unless they 889 * are spun up. 890 */ 891 if (done_ccb->ccb_h.func_code == XPT_SCSI_IO) { 892 scsi_cmd = (struct scsi_start_stop_unit *) 893 &done_ccb->csio.cdb_io.cdb_bytes; 894 895 if (scsi_cmd->opcode == START_STOP_UNIT) 896 xpt_async(AC_INQ_CHANGED, 897 done_ccb->ccb_h.path, NULL); 898 } 899 bcopy(done_ccb->ccb_h.saved_ccb_ptr, done_ccb, 900 sizeof(union ccb)); 901 902 periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG; 903 904 xpt_action(done_ccb); 905 906 break; 907 case CAM_SCSI_STATUS_ERROR: 908 scsi_cmd = (struct scsi_start_stop_unit *) 909 &done_ccb->csio.cdb_io.cdb_bytes; 910 if (sense != 0) { 911 struct scsi_sense_data *sense; 912 int error_code, sense_key, asc, ascq; 913 914 sense = &done_ccb->csio.sense_data; 915 scsi_extract_sense(sense, &error_code, 916 &sense_key, &asc, &ascq); 917 918 /* 919 * If the error is "invalid field in CDB", 920 * and the load/eject flag is set, turn the 921 * flag off and try again. This is just in 922 * case the drive in question barfs on the 923 * load eject flag. The CAM code should set 924 * the load/eject flag by default for 925 * removable media. 926 */ 927 928 /* XXX KDM 929 * Should we check to see what the specific 930 * scsi status is?? Or does it not matter 931 * since we already know that there was an 932 * error, and we know what the specific 933 * error code was, and we know what the 934 * opcode is.. 935 */ 936 if ((scsi_cmd->opcode == START_STOP_UNIT) && 937 ((scsi_cmd->how & SSS_LOEJ) != 0) && 938 (asc == 0x24) && (ascq == 0x00) && 939 (done_ccb->ccb_h.retry_count > 0)) { 940 941 scsi_cmd->how &= ~SSS_LOEJ; 942 943 xpt_action(done_ccb); 944 945 } else if (done_ccb->ccb_h.retry_count > 0) { 946 /* 947 * In this case, the error recovery 948 * command failed, but we've got 949 * some retries left on it. Give 950 * it another try. 951 */ 952 953 /* set the timeout to .5 sec */ 954 relsim_flags = 955 RELSIM_RELEASE_AFTER_TIMEOUT; 956 timeout = 500; 957 958 xpt_action(done_ccb); 959 960 break; 961 962 } else { 963 /* 964 * Copy the original CCB back and 965 * send it back to the caller. 966 */ 967 bcopy(done_ccb->ccb_h.saved_ccb_ptr, 968 done_ccb, sizeof(union ccb)); 969 970 periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG; 971 972 xpt_action(done_ccb); 973 } 974 } else { 975 /* 976 * Eh?? The command failed, but we don't 977 * have any sense. What's up with that? 978 * Fire the CCB again to return it to the 979 * caller. 980 */ 981 bcopy(done_ccb->ccb_h.saved_ccb_ptr, 982 done_ccb, sizeof(union ccb)); 983 984 periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG; 985 986 xpt_action(done_ccb); 987 988 } 989 break; 990 default: 991 bcopy(done_ccb->ccb_h.saved_ccb_ptr, done_ccb, 992 sizeof(union ccb)); 993 994 periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG; 995 996 xpt_action(done_ccb); 997 998 break; 999 } 1000 1001 /* decrement the retry count */ 1002 if (done_ccb->ccb_h.retry_count > 0) 1003 done_ccb->ccb_h.retry_count--; 1004 1005 qfrozen_cnt = cam_release_devq(done_ccb->ccb_h.path, 1006 /*relsim_flags*/relsim_flags, 1007 /*openings*/0, 1008 /*timeout*/timeout, 1009 /*getcount_only*/0); 1010 } 1011 1012 /* 1013 * Generic Async Event handler. Peripheral drivers usually 1014 * filter out the events that require personal attention, 1015 * and leave the rest to this function. 1016 */ 1017 void 1018 cam_periph_async(struct cam_periph *periph, u_int32_t code, 1019 struct cam_path *path, void *arg) 1020 { 1021 switch (code) { 1022 case AC_LOST_DEVICE: 1023 cam_periph_invalidate(periph); 1024 break; 1025 case AC_SENT_BDR: 1026 case AC_BUS_RESET: 1027 { 1028 cam_periph_bus_settle(periph, SCSI_DELAY); 1029 break; 1030 } 1031 default: 1032 break; 1033 } 1034 } 1035 1036 void 1037 cam_periph_bus_settle(struct cam_periph *periph, u_int bus_settle) 1038 { 1039 struct ccb_getdevstats cgds; 1040 1041 xpt_setup_ccb(&cgds.ccb_h, periph->path, /*priority*/1); 1042 cgds.ccb_h.func_code = XPT_GDEV_STATS; 1043 xpt_action((union ccb *)&cgds); 1044 cam_periph_freeze_after_event(periph, &cgds.last_reset, bus_settle); 1045 } 1046 1047 void 1048 cam_periph_freeze_after_event(struct cam_periph *periph, 1049 struct timeval* event_time, u_int duration_ms) 1050 { 1051 struct timeval delta; 1052 struct timeval duration_tv; 1053 1054 microuptime(&delta); 1055 timevalsub(&delta, event_time); 1056 duration_tv.tv_sec = duration_ms / 1000; 1057 duration_tv.tv_usec = (duration_ms % 1000) * 1000; 1058 if (timevalcmp(&delta, &duration_tv, <)) { 1059 timevalsub(&duration_tv, &delta); 1060 1061 duration_ms = duration_tv.tv_sec * 1000; 1062 duration_ms += duration_tv.tv_usec / 1000; 1063 cam_freeze_devq(periph->path); 1064 cam_release_devq(periph->path, 1065 RELSIM_RELEASE_AFTER_TIMEOUT, 1066 /*reduction*/0, 1067 /*timeout*/duration_ms, 1068 /*getcount_only*/0); 1069 } 1070 1071 } 1072 1073 /* 1074 * Generic error handler. Peripheral drivers usually filter 1075 * out the errors that they handle in a unique mannor, then 1076 * call this function. 1077 */ 1078 int 1079 cam_periph_error(union ccb *ccb, cam_flags camflags, 1080 u_int32_t sense_flags, union ccb *save_ccb) 1081 { 1082 cam_status status; 1083 int frozen; 1084 int sense; 1085 int error; 1086 int openings; 1087 int retry; 1088 u_int32_t relsim_flags; 1089 u_int32_t timeout; 1090 1091 status = ccb->ccb_h.status; 1092 frozen = (status & CAM_DEV_QFRZN) != 0; 1093 sense = (status & CAM_AUTOSNS_VALID) != 0; 1094 status &= CAM_STATUS_MASK; 1095 relsim_flags = 0; 1096 1097 switch (status) { 1098 case CAM_REQ_CMP: 1099 /* decrement the number of retries */ 1100 retry = ccb->ccb_h.retry_count > 0; 1101 if (retry) 1102 ccb->ccb_h.retry_count--; 1103 error = 0; 1104 break; 1105 case CAM_AUTOSENSE_FAIL: 1106 case CAM_SCSI_STATUS_ERROR: 1107 1108 switch (ccb->csio.scsi_status) { 1109 case SCSI_STATUS_OK: 1110 case SCSI_STATUS_COND_MET: 1111 case SCSI_STATUS_INTERMED: 1112 case SCSI_STATUS_INTERMED_COND_MET: 1113 error = 0; 1114 break; 1115 case SCSI_STATUS_CMD_TERMINATED: 1116 case SCSI_STATUS_CHECK_COND: 1117 if (sense != 0) { 1118 struct scsi_sense_data *sense; 1119 int error_code, sense_key, asc, ascq; 1120 struct cam_periph *periph; 1121 scsi_sense_action err_action; 1122 struct ccb_getdev cgd; 1123 1124 sense = &ccb->csio.sense_data; 1125 scsi_extract_sense(sense, &error_code, 1126 &sense_key, &asc, &ascq); 1127 periph = xpt_path_periph(ccb->ccb_h.path); 1128 1129 /* 1130 * Grab the inquiry data for this device. 1131 */ 1132 xpt_setup_ccb(&cgd.ccb_h, ccb->ccb_h.path, 1133 /*priority*/ 1); 1134 cgd.ccb_h.func_code = XPT_GDEV_TYPE; 1135 xpt_action((union ccb *)&cgd); 1136 1137 err_action = scsi_error_action(asc, ascq, 1138 &cgd.inq_data); 1139 1140 /* 1141 * Send a Test Unit Ready to the device. 1142 * If the 'many' flag is set, we send 120 1143 * test unit ready commands, one every half 1144 * second. Otherwise, we just send one TUR. 1145 * We only want to do this if the retry 1146 * count has not been exhausted. 1147 */ 1148 if (((err_action & SS_MASK) == SS_TUR) 1149 && save_ccb != NULL 1150 && ccb->ccb_h.retry_count > 0) { 1151 1152 /* 1153 * Since error recovery is already 1154 * in progress, don't attempt to 1155 * process this error. It is probably 1156 * related to the error that caused 1157 * the currently active error recovery 1158 * action. Also, we only have 1159 * space for one saved CCB, so if we 1160 * had two concurrent error recovery 1161 * actions, we would end up 1162 * over-writing one error recovery 1163 * CCB with another one. 1164 */ 1165 if (periph->flags & 1166 CAM_PERIPH_RECOVERY_INPROG) { 1167 error = ERESTART; 1168 break; 1169 } 1170 1171 periph->flags |= 1172 CAM_PERIPH_RECOVERY_INPROG; 1173 1174 /* decrement the number of retries */ 1175 if ((err_action & 1176 SSQ_DECREMENT_COUNT) != 0) { 1177 retry = 1; 1178 ccb->ccb_h.retry_count--; 1179 } 1180 1181 bcopy(ccb, save_ccb, sizeof(*save_ccb)); 1182 1183 /* 1184 * We retry this one every half 1185 * second for a minute. If the 1186 * device hasn't become ready in a 1187 * minute's time, it's unlikely to 1188 * ever become ready. If the table 1189 * doesn't specify SSQ_MANY, we can 1190 * only try this once. Oh well. 1191 */ 1192 if ((err_action & SSQ_MANY) != 0) 1193 scsi_test_unit_ready(&ccb->csio, 1194 /*retries*/120, 1195 camperiphdone, 1196 MSG_SIMPLE_Q_TAG, 1197 SSD_FULL_SIZE, 1198 /*timeout*/5000); 1199 else 1200 scsi_test_unit_ready(&ccb->csio, 1201 /*retries*/1, 1202 camperiphdone, 1203 MSG_SIMPLE_Q_TAG, 1204 SSD_FULL_SIZE, 1205 /*timeout*/5000); 1206 1207 /* release the queue after .5 sec. */ 1208 relsim_flags = 1209 RELSIM_RELEASE_AFTER_TIMEOUT; 1210 timeout = 500; 1211 /* 1212 * Drop the priority to 0 so that 1213 * we are the first to execute. Also 1214 * freeze the queue after this command 1215 * is sent so that we can restore the 1216 * old csio and have it queued in the 1217 * proper order before we let normal 1218 * transactions go to the drive. 1219 */ 1220 ccb->ccb_h.pinfo.priority = 0; 1221 ccb->ccb_h.flags |= CAM_DEV_QFREEZE; 1222 1223 /* 1224 * Save a pointer to the original 1225 * CCB in the new CCB. 1226 */ 1227 ccb->ccb_h.saved_ccb_ptr = save_ccb; 1228 1229 error = ERESTART; 1230 } 1231 /* 1232 * Send a start unit command to the device, 1233 * and then retry the command. We only 1234 * want to do this if the retry count has 1235 * not been exhausted. If the user 1236 * specified 0 retries, then we follow 1237 * their request and do not retry. 1238 */ 1239 else if (((err_action & SS_MASK) == SS_START) 1240 && save_ccb != NULL 1241 && ccb->ccb_h.retry_count > 0) { 1242 int le; 1243 1244 /* 1245 * Only one error recovery action 1246 * at a time. See above. 1247 */ 1248 if (periph->flags & 1249 CAM_PERIPH_RECOVERY_INPROG) { 1250 error = ERESTART; 1251 break; 1252 } 1253 1254 periph->flags |= 1255 CAM_PERIPH_RECOVERY_INPROG; 1256 1257 /* decrement the number of retries */ 1258 retry = 1; 1259 ccb->ccb_h.retry_count--; 1260 1261 /* 1262 * Check for removable media and 1263 * set load/eject flag 1264 * appropriately. 1265 */ 1266 if (SID_IS_REMOVABLE(&cgd.inq_data)) 1267 le = TRUE; 1268 else 1269 le = FALSE; 1270 1271 /* 1272 * Attempt to start the drive up. 1273 * 1274 * Save the current ccb so it can 1275 * be restored and retried once the 1276 * drive is started up. 1277 */ 1278 bcopy(ccb, save_ccb, sizeof(*save_ccb)); 1279 1280 scsi_start_stop(&ccb->csio, 1281 /*retries*/1, 1282 camperiphdone, 1283 MSG_SIMPLE_Q_TAG, 1284 /*start*/TRUE, 1285 /*load/eject*/le, 1286 /*immediate*/FALSE, 1287 SSD_FULL_SIZE, 1288 /*timeout*/50000); 1289 /* 1290 * Drop the priority to 0 so that 1291 * we are the first to execute. Also 1292 * freeze the queue after this command 1293 * is sent so that we can restore the 1294 * old csio and have it queued in the 1295 * proper order before we let normal 1296 * transactions go to the drive. 1297 */ 1298 ccb->ccb_h.pinfo.priority = 0; 1299 ccb->ccb_h.flags |= CAM_DEV_QFREEZE; 1300 1301 /* 1302 * Save a pointer to the original 1303 * CCB in the new CCB. 1304 */ 1305 ccb->ccb_h.saved_ccb_ptr = save_ccb; 1306 1307 error = ERESTART; 1308 } else if ((sense_flags & SF_RETRY_UA) != 0) { 1309 /* 1310 * XXX KDM this is a *horrible* 1311 * hack. 1312 */ 1313 error = scsi_interpret_sense(ccb, 1314 sense_flags, 1315 &relsim_flags, 1316 &openings, 1317 &timeout, 1318 err_action); 1319 } 1320 1321 /* 1322 * Theoretically, this code should send a 1323 * test unit ready to the given device, and 1324 * if it returns and error, send a start 1325 * unit command. Since we don't yet have 1326 * the capability to do two-command error 1327 * recovery, just send a start unit. 1328 * XXX KDM fix this! 1329 */ 1330 else if (((err_action & SS_MASK) == SS_TURSTART) 1331 && save_ccb != NULL 1332 && ccb->ccb_h.retry_count > 0) { 1333 int le; 1334 1335 /* 1336 * Only one error recovery action 1337 * at a time. See above. 1338 */ 1339 if (periph->flags & 1340 CAM_PERIPH_RECOVERY_INPROG) { 1341 error = ERESTART; 1342 break; 1343 } 1344 1345 periph->flags |= 1346 CAM_PERIPH_RECOVERY_INPROG; 1347 1348 /* decrement the number of retries */ 1349 retry = 1; 1350 ccb->ccb_h.retry_count--; 1351 1352 /* 1353 * Check for removable media and 1354 * set load/eject flag 1355 * appropriately. 1356 */ 1357 if (SID_IS_REMOVABLE(&cgd.inq_data)) 1358 le = TRUE; 1359 else 1360 le = FALSE; 1361 1362 /* 1363 * Attempt to start the drive up. 1364 * 1365 * Save the current ccb so it can 1366 * be restored and retried once the 1367 * drive is started up. 1368 */ 1369 bcopy(ccb, save_ccb, sizeof(*save_ccb)); 1370 1371 scsi_start_stop(&ccb->csio, 1372 /*retries*/1, 1373 camperiphdone, 1374 MSG_SIMPLE_Q_TAG, 1375 /*start*/TRUE, 1376 /*load/eject*/le, 1377 /*immediate*/FALSE, 1378 SSD_FULL_SIZE, 1379 /*timeout*/50000); 1380 1381 /* release the queue after .5 sec. */ 1382 relsim_flags = 1383 RELSIM_RELEASE_AFTER_TIMEOUT; 1384 timeout = 500; 1385 /* 1386 * Drop the priority to 0 so that 1387 * we are the first to execute. Also 1388 * freeze the queue after this command 1389 * is sent so that we can restore the 1390 * old csio and have it queued in the 1391 * proper order before we let normal 1392 * transactions go to the drive. 1393 */ 1394 ccb->ccb_h.pinfo.priority = 0; 1395 ccb->ccb_h.flags |= CAM_DEV_QFREEZE; 1396 1397 /* 1398 * Save a pointer to the original 1399 * CCB in the new CCB. 1400 */ 1401 ccb->ccb_h.saved_ccb_ptr = save_ccb; 1402 1403 error = ERESTART; 1404 } else { 1405 error = scsi_interpret_sense(ccb, 1406 sense_flags, 1407 &relsim_flags, 1408 &openings, 1409 &timeout, 1410 err_action); 1411 } 1412 } else if (ccb->csio.scsi_status == 1413 SCSI_STATUS_CHECK_COND 1414 && status != CAM_AUTOSENSE_FAIL) { 1415 /* no point in decrementing the retry count */ 1416 panic("cam_periph_error: scsi status of " 1417 "CHECK COND returned but no sense " 1418 "information is availible. " 1419 "Controller should have returned " 1420 "CAM_AUTOSENSE_FAILED"); 1421 /* NOTREACHED */ 1422 error = EIO; 1423 } else if (ccb->ccb_h.retry_count == 0) { 1424 /* 1425 * XXX KDM shouldn't there be a better 1426 * argument to return?? 1427 */ 1428 error = EIO; 1429 } else { 1430 /* decrement the number of retries */ 1431 retry = ccb->ccb_h.retry_count > 0; 1432 if (retry) 1433 ccb->ccb_h.retry_count--; 1434 /* 1435 * If it was aborted with no 1436 * clue as to the reason, just 1437 * retry it again. 1438 */ 1439 error = ERESTART; 1440 } 1441 break; 1442 case SCSI_STATUS_QUEUE_FULL: 1443 { 1444 /* no decrement */ 1445 struct ccb_getdevstats cgds; 1446 1447 /* 1448 * First off, find out what the current 1449 * transaction counts are. 1450 */ 1451 xpt_setup_ccb(&cgds.ccb_h, 1452 ccb->ccb_h.path, 1453 /*priority*/1); 1454 cgds.ccb_h.func_code = XPT_GDEV_STATS; 1455 xpt_action((union ccb *)&cgds); 1456 1457 /* 1458 * If we were the only transaction active, treat 1459 * the QUEUE FULL as if it were a BUSY condition. 1460 */ 1461 if (cgds.dev_active != 0) { 1462 int total_openings; 1463 1464 /* 1465 * Reduce the number of openings to 1466 * be 1 less than the amount it took 1467 * to get a queue full bounded by the 1468 * minimum allowed tag count for this 1469 * device. 1470 */ 1471 total_openings = 1472 cgds.dev_active+cgds.dev_openings; 1473 openings = cgds.dev_active; 1474 if (openings < cgds.mintags) 1475 openings = cgds.mintags; 1476 if (openings < total_openings) 1477 relsim_flags = RELSIM_ADJUST_OPENINGS; 1478 else { 1479 /* 1480 * Some devices report queue full for 1481 * temporary resource shortages. For 1482 * this reason, we allow a minimum 1483 * tag count to be entered via a 1484 * quirk entry to prevent the queue 1485 * count on these devices from falling 1486 * to a pessimisticly low value. We 1487 * still wait for the next successful 1488 * completion, however, before queueing 1489 * more transactions to the device. 1490 */ 1491 relsim_flags = 1492 RELSIM_RELEASE_AFTER_CMDCMPLT; 1493 } 1494 timeout = 0; 1495 error = ERESTART; 1496 break; 1497 } 1498 /* FALLTHROUGH */ 1499 } 1500 case SCSI_STATUS_BUSY: 1501 /* 1502 * Restart the queue after either another 1503 * command completes or a 1 second timeout. 1504 * If we have any retries left, that is. 1505 */ 1506 retry = ccb->ccb_h.retry_count > 0; 1507 if (retry) { 1508 ccb->ccb_h.retry_count--; 1509 error = ERESTART; 1510 relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT 1511 | RELSIM_RELEASE_AFTER_CMDCMPLT; 1512 timeout = 1000; 1513 } else { 1514 error = EIO; 1515 } 1516 break; 1517 case SCSI_STATUS_RESERV_CONFLICT: 1518 error = EIO; 1519 break; 1520 default: 1521 error = EIO; 1522 break; 1523 } 1524 break; 1525 case CAM_REQ_CMP_ERR: 1526 case CAM_CMD_TIMEOUT: 1527 case CAM_UNEXP_BUSFREE: 1528 case CAM_UNCOR_PARITY: 1529 case CAM_DATA_RUN_ERR: 1530 /* decrement the number of retries */ 1531 retry = ccb->ccb_h.retry_count > 0; 1532 if (retry) { 1533 ccb->ccb_h.retry_count--; 1534 error = ERESTART; 1535 } else { 1536 error = EIO; 1537 } 1538 break; 1539 case CAM_UA_ABORT: 1540 case CAM_UA_TERMIO: 1541 case CAM_MSG_REJECT_REC: 1542 /* XXX Don't know that these are correct */ 1543 error = EIO; 1544 break; 1545 case CAM_SEL_TIMEOUT: 1546 { 1547 /* 1548 * XXX 1549 * A single selection timeout should not be enough 1550 * to invalidate a device. We should retry for multiple 1551 * seconds assuming this isn't a probe. We'll probably 1552 * need a special flag for that. 1553 */ 1554 #if 0 1555 struct cam_path *newpath; 1556 1557 /* Should we do more if we can't create the path?? */ 1558 if (xpt_create_path(&newpath, xpt_path_periph(ccb->ccb_h.path), 1559 xpt_path_path_id(ccb->ccb_h.path), 1560 xpt_path_target_id(ccb->ccb_h.path), 1561 CAM_LUN_WILDCARD) != CAM_REQ_CMP) 1562 break; 1563 /* 1564 * Let peripheral drivers know that this device has gone 1565 * away. 1566 */ 1567 xpt_async(AC_LOST_DEVICE, newpath, NULL); 1568 xpt_free_path(newpath); 1569 #endif 1570 if ((sense_flags & SF_RETRY_SELTO) != 0) { 1571 retry = ccb->ccb_h.retry_count > 0; 1572 if (retry) { 1573 ccb->ccb_h.retry_count--; 1574 error = ERESTART; 1575 /* 1576 * Wait half a second to give the device 1577 * time to recover before we try again. 1578 */ 1579 relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT; 1580 timeout = 500; 1581 } else { 1582 error = ENXIO; 1583 } 1584 } else { 1585 error = ENXIO; 1586 } 1587 break; 1588 } 1589 case CAM_REQ_INVALID: 1590 case CAM_PATH_INVALID: 1591 case CAM_DEV_NOT_THERE: 1592 case CAM_NO_HBA: 1593 case CAM_PROVIDE_FAIL: 1594 case CAM_REQ_TOO_BIG: 1595 error = EINVAL; 1596 break; 1597 case CAM_SCSI_BUS_RESET: 1598 case CAM_BDR_SENT: 1599 case CAM_REQUEUE_REQ: 1600 /* Unconditional requeue, dammit */ 1601 error = ERESTART; 1602 break; 1603 case CAM_RESRC_UNAVAIL: 1604 case CAM_BUSY: 1605 /* timeout??? */ 1606 default: 1607 /* decrement the number of retries */ 1608 retry = ccb->ccb_h.retry_count > 0; 1609 if (retry) { 1610 ccb->ccb_h.retry_count--; 1611 error = ERESTART; 1612 } else { 1613 /* Check the sense codes */ 1614 error = EIO; 1615 } 1616 break; 1617 } 1618 1619 /* Attempt a retry */ 1620 if (error == ERESTART || error == 0) { 1621 if (frozen != 0) 1622 ccb->ccb_h.status &= ~CAM_DEV_QFRZN; 1623 1624 if (error == ERESTART) 1625 xpt_action(ccb); 1626 1627 if (frozen != 0) { 1628 cam_release_devq(ccb->ccb_h.path, 1629 relsim_flags, 1630 openings, 1631 timeout, 1632 /*getcount_only*/0); 1633 } 1634 } 1635 1636 1637 return (error); 1638 } 1639