sys/cam/cam_periph.c

   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
  30 #include <sys/cdefs.h>
  31 __FBSDID("$FreeBSD$");
  32
  33 #include <sys/param.h>
  34 #include <sys/systm.h>
  35 #include <sys/types.h>
  36 #include <sys/malloc.h>
  37 #include <sys/kernel.h>
  38 #include <sys/bio.h>
  39 #include <sys/lock.h>
  40 #include <sys/mutex.h>
  41 #include <sys/buf.h>
  42 #include <sys/proc.h>
  43 #include <sys/devicestat.h>
  44 #include <sys/bus.h>
  45 #include <vm/vm.h>
  46 #include <vm/vm_extern.h>
  47
  48 #include <cam/cam.h>
  49 #include <cam/cam_ccb.h>
  50 #include <cam/cam_queue.h>
  51 #include <cam/cam_xpt_periph.h>
  52 #include <cam/cam_periph.h>
  53 #include <cam/cam_debug.h>
  54 #include <cam/cam_sim.h>
  55
  56 #include <cam/scsi/scsi_all.h>
  57 #include <cam/scsi/scsi_message.h>
  58 #include <cam/scsi/scsi_pass.h>
  59
  60 static  u_int           camperiphnextunit(struct periph_driver *p_drv,
  61                                           u_int newunit, int wired,
  62                                           path_id_t pathid, target_id_t target,
  63                                           lun_id_t lun);
  64 static  u_int           camperiphunit(struct periph_driver *p_drv,
  65                                       path_id_t pathid, target_id_t target,
  66                                       lun_id_t lun);
  67 static  void            camperiphdone(struct cam_periph *periph,
  68                                         union ccb *done_ccb);
  69 static  void            camperiphfree(struct cam_periph *periph);
  70 static int              camperiphscsistatuserror(union ccb *ccb,
  71                                                  cam_flags camflags,
  72                                                  u_int32_t sense_flags,
  73                                                  int *openings,
  74                                                  u_int32_t *relsim_flags,
  75                                                  u_int32_t *timeout,
  76                                                  const char **action_string);
  77 static  int             camperiphscsisenseerror(union ccb *ccb,
  78                                                 cam_flags camflags,
  79                                                 u_int32_t sense_flags,
  80                                                 int *openings,
  81                                                 u_int32_t *relsim_flags,
  82                                                 u_int32_t *timeout,
  83                                                 const char **action_string);
  84
  85 static int nperiph_drivers;
  86 static int initialized = 0;
  87 struct periph_driver **periph_drivers;
  88
  89 MALLOC_DEFINE(M_CAMPERIPH, "CAM periph", "CAM peripheral buffers");
  90
  91 static int periph_selto_delay = 1000;
  92 TUNABLE_INT("kern.cam.periph_selto_delay", &periph_selto_delay);
  93 static int periph_noresrc_delay = 500;
  94 TUNABLE_INT("kern.cam.periph_noresrc_delay", &periph_noresrc_delay);
  95 static int periph_busy_delay = 500;
  96 TUNABLE_INT("kern.cam.periph_busy_delay", &periph_busy_delay);
  97
  98
  99 void
 100 periphdriver_register(void *data)
 101 {
 102         struct periph_driver *drv = (struct periph_driver *)data;
 103         struct periph_driver **newdrivers, **old;
 104         int ndrivers;
 105
 106         ndrivers = nperiph_drivers + 2;
 107         newdrivers = malloc(sizeof(*newdrivers) * ndrivers, M_CAMPERIPH,
 108                             M_WAITOK);
 109         if (periph_drivers)
 110                 bcopy(periph_drivers, newdrivers,
 111                       sizeof(*newdrivers) * nperiph_drivers);
 112         newdrivers[nperiph_drivers] = drv;
 113         newdrivers[nperiph_drivers + 1] = NULL;
 114         old = periph_drivers;
 115         periph_drivers = newdrivers;
 116         if (old)
 117                 free(old, M_CAMPERIPH);
 118         nperiph_drivers++;
 119         /* If driver marked as early or it is late now, initialize it. */
 120         if (((drv->flags & CAM_PERIPH_DRV_EARLY) != 0 && initialized > 0) ||
 121             initialized > 1)
 122                 (*drv->init)();
 123 }
 124
 125 void
 126 periphdriver_init(int level)
 127 {
 128         int     i, early;
 129
 130         initialized = max(initialized, level);
 131         for (i = 0; periph_drivers[i] != NULL; i++) {
 132                 early = (periph_drivers[i]->flags & CAM_PERIPH_DRV_EARLY) ? 1 : 2;
 133                 if (early == initialized)
 134                         (*periph_drivers[i]->init)();
 135         }
 136 }
 137
 138 cam_status
 139 cam_periph_alloc(periph_ctor_t *periph_ctor,
 140                  periph_oninv_t *periph_oninvalidate,
 141                  periph_dtor_t *periph_dtor, periph_start_t *periph_start,
 142                  char *name, cam_periph_type type, struct cam_path *path,
 143                  ac_callback_t *ac_callback, ac_code code, void *arg)
 144 {
 145         struct          periph_driver **p_drv;
 146         struct          cam_sim *sim;
 147         struct          cam_periph *periph;
 148         struct          cam_periph *cur_periph;
 149         path_id_t       path_id;
 150         target_id_t     target_id;
 151         lun_id_t        lun_id;
 152         cam_status      status;
 153         u_int           init_level;
 154
 155         init_level = 0;
 156         /*
 157          * Handle Hot-Plug scenarios.  If there is already a peripheral
 158          * of our type assigned to this path, we are likely waiting for
 159          * final close on an old, invalidated, peripheral.  If this is
 160          * the case, queue up a deferred call to the peripheral's async
 161          * handler.  If it looks like a mistaken re-allocation, complain.
 162          */
 163         if ((periph = cam_periph_find(path, name)) != NULL) {
 164
 165                 if ((periph->flags & CAM_PERIPH_INVALID) != 0
 166                  && (periph->flags & CAM_PERIPH_NEW_DEV_FOUND) == 0) {
 167                         periph->flags |= CAM_PERIPH_NEW_DEV_FOUND;
 168                         periph->deferred_callback = ac_callback;
 169                         periph->deferred_ac = code;
 170                         return (CAM_REQ_INPROG);
 171                 } else {
 172                         printf("cam_periph_alloc: attempt to re-allocate "
 173                                "valid device %s%d rejected flags %#x "
 174                                "refcount %d\n", periph->periph_name,
 175                                periph->unit_number, periph->flags,
 176                                periph->refcount);
 177                 }
 178                 return (CAM_REQ_INVALID);
 179         }
 180
 181         periph = (struct cam_periph *)malloc(sizeof(*periph), M_CAMPERIPH,
 182                                              M_NOWAIT|M_ZERO);
 183
 184         if (periph == NULL)
 185                 return (CAM_RESRC_UNAVAIL);
 186
 187         init_level++;
 188
 189
 190         sim = xpt_path_sim(path);
 191         path_id = xpt_path_path_id(path);
 192         target_id = xpt_path_target_id(path);
 193         lun_id = xpt_path_lun_id(path);
 194         cam_init_pinfo(&periph->pinfo);
 195         periph->periph_start = periph_start;
 196         periph->periph_dtor = periph_dtor;
 197         periph->periph_oninval = periph_oninvalidate;
 198         periph->type = type;
 199         periph->periph_name = name;
 200         periph->immediate_priority = CAM_PRIORITY_NONE;
 201         periph->refcount = 0;
 202         periph->sim = sim;
 203         SLIST_INIT(&periph->ccb_list);
 204         status = xpt_create_path(&path, periph, path_id, target_id, lun_id);
 205         if (status != CAM_REQ_CMP)
 206                 goto failure;
 207         periph->path = path;
 208
 209         xpt_lock_buses();
 210         for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
 211                 if (strcmp((*p_drv)->driver_name, name) == 0)
 212                         break;
 213         }
 214         if (*p_drv == NULL) {
 215                 printf("cam_periph_alloc: invalid periph name '%s'\n", name);
 216                 xpt_free_path(periph->path);
 217                 free(periph, M_CAMPERIPH);
 218                 xpt_unlock_buses();
 219                 return (CAM_REQ_INVALID);
 220         }
 221         periph->unit_number = camperiphunit(*p_drv, path_id, target_id, lun_id);
 222         cur_periph = TAILQ_FIRST(&(*p_drv)->units);
 223         while (cur_periph != NULL
 224             && cur_periph->unit_number < periph->unit_number)
 225                 cur_periph = TAILQ_NEXT(cur_periph, unit_links);
 226         if (cur_periph != NULL) {
 227                 KASSERT(cur_periph->unit_number != periph->unit_number, ("duplicate units on periph list"));
 228                 TAILQ_INSERT_BEFORE(cur_periph, periph, unit_links);
 229         } else {
 230                 TAILQ_INSERT_TAIL(&(*p_drv)->units, periph, unit_links);
 231                 (*p_drv)->generation++;
 232         }
 233         xpt_unlock_buses();
 234
 235         init_level++;
 236
 237         status = xpt_add_periph(periph);
 238         if (status != CAM_REQ_CMP)
 239                 goto failure;
 240
 241         init_level++;
 242         CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph created\n"));
 243
 244         status = periph_ctor(periph, arg);
 245
 246         if (status == CAM_REQ_CMP)
 247                 init_level++;
 248
 249 failure:
 250         switch (init_level) {
 251         case 4:
 252                 /* Initialized successfully */
 253                 break;
 254         case 3:
 255                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph destroyed\n"));
 256                 xpt_remove_periph(periph);
 257                 /* FALLTHROUGH */
 258         case 2:
 259                 xpt_lock_buses();
 260                 TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links);
 261                 xpt_unlock_buses();
 262                 xpt_free_path(periph->path);
 263                 /* FALLTHROUGH */
 264         case 1:
 265                 free(periph, M_CAMPERIPH);
 266                 /* FALLTHROUGH */
 267         case 0:
 268                 /* No cleanup to perform. */
 269                 break;
 270         default:
 271                 panic("%s: Unknown init level", __func__);
 272         }
 273         return(status);
 274 }
 275
 276 /*
 277  * Find a peripheral structure with the specified path, target, lun,
 278  * and (optionally) type.  If the name is NULL, this function will return
 279  * the first peripheral driver that matches the specified path.
 280  */
 281 struct cam_periph *
 282 cam_periph_find(struct cam_path *path, char *name)
 283 {
 284         struct periph_driver **p_drv;
 285         struct cam_periph *periph;
 286
 287         xpt_lock_buses();
 288         for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
 289
 290                 if (name != NULL && (strcmp((*p_drv)->driver_name, name) != 0))
 291                         continue;
 292
 293                 TAILQ_FOREACH(periph, &(*p_drv)->units, unit_links) {
 294                         if (xpt_path_comp(periph->path, path) == 0) {
 295                                 xpt_unlock_buses();
 296                                 mtx_assert(periph->sim->mtx, MA_OWNED);
 297                                 return(periph);
 298                         }
 299                 }
 300                 if (name != NULL) {
 301                         xpt_unlock_buses();
 302                         return(NULL);
 303                 }
 304         }
 305         xpt_unlock_buses();
 306         return(NULL);
 307 }
 308
 309 cam_status
 310 cam_periph_acquire(struct cam_periph *periph)
 311 {
 312         cam_status status;
 313
 314         status = CAM_REQ_CMP_ERR;
 315         if (periph == NULL)
 316                 return (status);
 317
 318         xpt_lock_buses();
 319         if ((periph->flags & CAM_PERIPH_INVALID) == 0) {
 320                 periph->refcount++;
 321                 status = CAM_REQ_CMP;
 322         }
 323         xpt_unlock_buses();
 324
 325         return (status);
 326 }
 327
 328 void
 329 cam_periph_release_locked_buses(struct cam_periph *periph)
 330 {
 331         if (periph->refcount != 0) {
 332                 periph->refcount--;
 333         } else {
 334                 panic("%s: release of %p when refcount is zero\n ", __func__,
 335                       periph);
 336         }
 337         if (periph->refcount == 0
 338             && (periph->flags & CAM_PERIPH_INVALID)) {
 339                 camperiphfree(periph);
 340         }
 341 }
 342
 343 void
 344 cam_periph_release_locked(struct cam_periph *periph)
 345 {
 346
 347         if (periph == NULL)
 348                 return;
 349
 350         xpt_lock_buses();
 351         cam_periph_release_locked_buses(periph);
 352         xpt_unlock_buses();
 353 }
 354
 355 void
 356 cam_periph_release(struct cam_periph *periph)
 357 {
 358         struct cam_sim *sim;
 359
 360         if (periph == NULL)
 361                 return;
 362
 363         sim = periph->sim;
 364         mtx_assert(sim->mtx, MA_NOTOWNED);
 365         mtx_lock(sim->mtx);
 366         cam_periph_release_locked(periph);
 367         mtx_unlock(sim->mtx);
 368 }
 369
 370 int
 371 cam_periph_hold(struct cam_periph *periph, int priority)
 372 {
 373         int error;
 374
 375         /*
 376          * Increment the reference count on the peripheral
 377          * while we wait for our lock attempt to succeed
 378          * to ensure the peripheral doesn't disappear out
 379          * from user us while we sleep.
 380          */
 381
 382         if (cam_periph_acquire(periph) != CAM_REQ_CMP)
 383                 return (ENXIO);
 384
 385         mtx_assert(periph->sim->mtx, MA_OWNED);
 386         while ((periph->flags & CAM_PERIPH_LOCKED) != 0) {
 387                 periph->flags |= CAM_PERIPH_LOCK_WANTED;
 388                 if ((error = mtx_sleep(periph, periph->sim->mtx, priority,
 389                     "caplck", 0)) != 0) {
 390                         cam_periph_release_locked(periph);
 391                         return (error);
 392                 }
 393                 if (periph->flags & CAM_PERIPH_INVALID) {
 394                         cam_periph_release_locked(periph);
 395                         return (ENXIO);
 396                 }
 397         }
 398
 399         periph->flags |= CAM_PERIPH_LOCKED;
 400         return (0);
 401 }
 402
 403 void
 404 cam_periph_unhold(struct cam_periph *periph)
 405 {
 406
 407         mtx_assert(periph->sim->mtx, MA_OWNED);
 408
 409         periph->flags &= ~CAM_PERIPH_LOCKED;
 410         if ((periph->flags & CAM_PERIPH_LOCK_WANTED) != 0) {
 411                 periph->flags &= ~CAM_PERIPH_LOCK_WANTED;
 412                 wakeup(periph);
 413         }
 414
 415         cam_periph_release_locked(periph);
 416 }
 417
 418 /*
 419  * Look for the next unit number that is not currently in use for this
 420  * peripheral type starting at "newunit".  Also exclude unit numbers that
 421  * are reserved by for future "hardwiring" unless we already know that this
 422  * is a potential wired device.  Only assume that the device is "wired" the
 423  * first time through the loop since after that we'll be looking at unit
 424  * numbers that did not match a wiring entry.
 425  */
 426 static u_int
 427 camperiphnextunit(struct periph_driver *p_drv, u_int newunit, int wired,
 428                   path_id_t pathid, target_id_t target, lun_id_t lun)
 429 {
 430         struct  cam_periph *periph;
 431         char    *periph_name;
 432         int     i, val, dunit, r;
 433         const char *dname, *strval;
 434
 435         periph_name = p_drv->driver_name;
 436         for (;;newunit++) {
 437
 438                 for (periph = TAILQ_FIRST(&p_drv->units);
 439                      periph != NULL && periph->unit_number != newunit;
 440                      periph = TAILQ_NEXT(periph, unit_links))
 441                         ;
 442
 443                 if (periph != NULL && periph->unit_number == newunit) {
 444                         if (wired != 0) {
 445                                 xpt_print(periph->path, "Duplicate Wired "
 446                                     "Device entry!\n");
 447                                 xpt_print(periph->path, "Second device (%s "
 448                                     "device at scbus%d target %d lun %d) will "
 449                                     "not be wired\n", periph_name, pathid,
 450                                     target, lun);
 451                                 wired = 0;
 452                         }
 453                         continue;
 454                 }
 455                 if (wired)
 456                         break;
 457
 458                 /*
 459                  * Don't match entries like "da 4" as a wired down
 460                  * device, but do match entries like "da 4 target 5"
 461                  * or even "da 4 scbus 1".
 462                  */
 463                 i = 0;
 464                 dname = periph_name;
 465                 for (;;) {
 466                         r = resource_find_dev(&i, dname, &dunit, NULL, NULL);
 467                         if (r != 0)
 468                                 break;
 469                         /* if no "target" and no specific scbus, skip */
 470                         if (resource_int_value(dname, dunit, "target", &val) &&
 471                             (resource_string_value(dname, dunit, "at",&strval)||
 472                              strcmp(strval, "scbus") == 0))
 473                                 continue;
 474                         if (newunit == dunit)
 475                                 break;
 476                 }
 477                 if (r != 0)
 478                         break;
 479         }
 480         return (newunit);
 481 }
 482
 483 static u_int
 484 camperiphunit(struct periph_driver *p_drv, path_id_t pathid,
 485               target_id_t target, lun_id_t lun)
 486 {
 487         u_int   unit;
 488         int     wired, i, val, dunit;
 489         const char *dname, *strval;
 490         char    pathbuf[32], *periph_name;
 491
 492         periph_name = p_drv->driver_name;
 493         snprintf(pathbuf, sizeof(pathbuf), "scbus%d", pathid);
 494         unit = 0;
 495         i = 0;
 496         dname = periph_name;
 497         for (wired = 0; resource_find_dev(&i, dname, &dunit, NULL, NULL) == 0;
 498              wired = 0) {
 499                 if (resource_string_value(dname, dunit, "at", &strval) == 0) {
 500                         if (strcmp(strval, pathbuf) != 0)
 501                                 continue;
 502                         wired++;
 503                 }
 504                 if (resource_int_value(dname, dunit, "target", &val) == 0) {
 505                         if (val != target)
 506                                 continue;
 507                         wired++;
 508                 }
 509                 if (resource_int_value(dname, dunit, "lun", &val) == 0) {
 510                         if (val != lun)
 511                                 continue;
 512                         wired++;
 513                 }
 514                 if (wired != 0) {
 515                         unit = dunit;
 516                         break;
 517                 }
 518         }
 519
 520         /*
 521          * Either start from 0 looking for the next unit or from
 522          * the unit number given in the resource config.  This way,
 523          * if we have wildcard matches, we don't return the same
 524          * unit number twice.
 525          */
 526         unit = camperiphnextunit(p_drv, unit, wired, pathid, target, lun);
 527
 528         return (unit);
 529 }
 530
 531 void
 532 cam_periph_invalidate(struct cam_periph *periph)
 533 {
 534
 535         CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph invalidated\n"));
 536         /*
 537          * We only call this routine the first time a peripheral is
 538          * invalidated.
 539          */
 540         if (((periph->flags & CAM_PERIPH_INVALID) == 0)
 541          && (periph->periph_oninval != NULL))
 542                 periph->periph_oninval(periph);
 543
 544         periph->flags |= CAM_PERIPH_INVALID;
 545         periph->flags &= ~CAM_PERIPH_NEW_DEV_FOUND;
 546
 547         xpt_lock_buses();
 548         if (periph->refcount == 0)
 549                 camperiphfree(periph);
 550         xpt_unlock_buses();
 551 }
 552
 553 static void
 554 camperiphfree(struct cam_periph *periph)
 555 {
 556         struct periph_driver **p_drv;
 557
 558         for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
 559                 if (strcmp((*p_drv)->driver_name, periph->periph_name) == 0)
 560                         break;
 561         }
 562         if (*p_drv == NULL) {
 563                 printf("camperiphfree: attempt to free non-existant periph\n");
 564                 return;
 565         }
 566
 567         TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links);
 568         (*p_drv)->generation++;
 569         xpt_unlock_buses();
 570
 571         if (periph->periph_dtor != NULL)
 572                 periph->periph_dtor(periph);
 573         xpt_remove_periph(periph);
 574         CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph destroyed\n"));
 575
 576         if (periph->flags & CAM_PERIPH_NEW_DEV_FOUND) {
 577                 union ccb ccb;
 578                 void *arg;
 579
 580                 switch (periph->deferred_ac) {
 581                 case AC_FOUND_DEVICE:
 582                         ccb.ccb_h.func_code = XPT_GDEV_TYPE;
 583                         xpt_setup_ccb(&ccb.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 584                         xpt_action(&ccb);
 585                         arg = &ccb;
 586                         break;
 587                 case AC_PATH_REGISTERED:
 588                         ccb.ccb_h.func_code = XPT_PATH_INQ;
 589                         xpt_setup_ccb(&ccb.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 590                         xpt_action(&ccb);
 591                         arg = &ccb;
 592                         break;
 593                 default:
 594                         arg = NULL;
 595                         break;
 596                 }
 597                 periph->deferred_callback(NULL, periph->deferred_ac,
 598                                           periph->path, arg);
 599         }
 600         xpt_free_path(periph->path);
 601         free(periph, M_CAMPERIPH);
 602         xpt_lock_buses();
 603 }
 604
 605 /*
 606  * Map user virtual pointers into kernel virtual address space, so we can
 607  * access the memory.  This won't work on physical pointers, for now it's
 608  * up to the caller to check for that.  (XXX KDM -- should we do that here
 609  * instead?)  This also only works for up to MAXPHYS memory.  Since we use
 610  * buffers to map stuff in and out, we're limited to the buffer size.
 611  */
 612 int
 613 cam_periph_mapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo)
 614 {
 615         int numbufs, i, j;
 616         int flags[CAM_PERIPH_MAXMAPS];
 617         u_int8_t **data_ptrs[CAM_PERIPH_MAXMAPS];
 618         u_int32_t lengths[CAM_PERIPH_MAXMAPS];
 619         u_int32_t dirs[CAM_PERIPH_MAXMAPS];
 620         /* Some controllers may not be able to handle more data. */
 621         size_t maxmap = DFLTPHYS;
 622
 623         switch(ccb->ccb_h.func_code) {
 624         case XPT_DEV_MATCH:
 625                 if (ccb->cdm.match_buf_len == 0) {
 626                         printf("cam_periph_mapmem: invalid match buffer "
 627                                "length 0\n");
 628                         return(EINVAL);
 629                 }
 630                 if (ccb->cdm.pattern_buf_len > 0) {
 631                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.patterns;
 632                         lengths[0] = ccb->cdm.pattern_buf_len;
 633                         dirs[0] = CAM_DIR_OUT;
 634                         data_ptrs[1] = (u_int8_t **)&ccb->cdm.matches;
 635                         lengths[1] = ccb->cdm.match_buf_len;
 636                         dirs[1] = CAM_DIR_IN;
 637                         numbufs = 2;
 638                 } else {
 639                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.matches;
 640                         lengths[0] = ccb->cdm.match_buf_len;
 641                         dirs[0] = CAM_DIR_IN;
 642                         numbufs = 1;
 643                 }
 644                 /*
 645                  * This request will not go to the hardware, no reason
 646                  * to be so strict. vmapbuf() is able to map up to MAXPHYS.
 647                  */
 648                 maxmap = MAXPHYS;
 649                 break;
 650         case XPT_SCSI_IO:
 651         case XPT_CONT_TARGET_IO:
 652                 if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_NONE)
 653                         return(0);
 654
 655                 data_ptrs[0] = &ccb->csio.data_ptr;
 656                 lengths[0] = ccb->csio.dxfer_len;
 657                 dirs[0] = ccb->ccb_h.flags & CAM_DIR_MASK;
 658                 numbufs = 1;
 659                 break;
 660         case XPT_ATA_IO:
 661                 if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_NONE)
 662                         return(0);
 663
 664                 data_ptrs[0] = &ccb->ataio.data_ptr;
 665                 lengths[0] = ccb->ataio.dxfer_len;
 666                 dirs[0] = ccb->ccb_h.flags & CAM_DIR_MASK;
 667                 numbufs = 1;
 668                 break;
 669         default:
 670                 return(EINVAL);
 671                 break; /* NOTREACHED */
 672         }
 673
 674         /*
 675          * Check the transfer length and permissions first, so we don't
 676          * have to unmap any previously mapped buffers.
 677          */
 678         for (i = 0; i < numbufs; i++) {
 679
 680                 flags[i] = 0;
 681
 682                 /*
 683                  * The userland data pointer passed in may not be page
 684                  * aligned.  vmapbuf() truncates the address to a page
 685                  * boundary, so if the address isn't page aligned, we'll
 686                  * need enough space for the given transfer length, plus
 687                  * whatever extra space is necessary to make it to the page
 688                  * boundary.
 689                  */
 690                 if ((lengths[i] +
 691                     (((vm_offset_t)(*data_ptrs[i])) & PAGE_MASK)) > maxmap){
 692                         printf("cam_periph_mapmem: attempt to map %lu bytes, "
 693                                "which is greater than %lu\n",
 694                                (long)(lengths[i] +
 695                                (((vm_offset_t)(*data_ptrs[i])) & PAGE_MASK)),
 696                                (u_long)maxmap);
 697                         return(E2BIG);
 698                 }
 699
 700                 if (dirs[i] & CAM_DIR_OUT) {
 701                         flags[i] = BIO_WRITE;
 702                 }
 703
 704                 if (dirs[i] & CAM_DIR_IN) {
 705                         flags[i] = BIO_READ;
 706                 }
 707
 708         }
 709
 710         /* this keeps the current process from getting swapped */
 711         /*
 712          * XXX KDM should I use P_NOSWAP instead?
 713          */
 714         PHOLD(curproc);
 715
 716         for (i = 0; i < numbufs; i++) {
 717                 /*
 718                  * Get the buffer.
 719                  */
 720                 mapinfo->bp[i] = getpbuf(NULL);
 721
 722                 /* save the buffer's data address */
 723                 mapinfo->bp[i]->b_saveaddr = mapinfo->bp[i]->b_data;
 724
 725                 /* put our pointer in the data slot */
 726                 mapinfo->bp[i]->b_data = *data_ptrs[i];
 727
 728                 /* set the transfer length, we know it's < MAXPHYS */
 729                 mapinfo->bp[i]->b_bufsize = lengths[i];
 730
 731                 /* set the direction */
 732                 mapinfo->bp[i]->b_iocmd = flags[i];
 733
 734                 /*
 735                  * Map the buffer into kernel memory.
 736                  *
 737                  * Note that useracc() alone is not a  sufficient test.
 738                  * vmapbuf() can still fail due to a smaller file mapped
 739                  * into a larger area of VM, or if userland races against
 740                  * vmapbuf() after the useracc() check.
 741                  */
 742                 if (vmapbuf(mapinfo->bp[i]) < 0) {
 743                         for (j = 0; j < i; ++j) {
 744                                 *data_ptrs[j] = mapinfo->bp[j]->b_saveaddr;
 745                                 vunmapbuf(mapinfo->bp[j]);
 746                                 relpbuf(mapinfo->bp[j], NULL);
 747                         }
 748                         relpbuf(mapinfo->bp[i], NULL);
 749                         PRELE(curproc);
 750                         return(EACCES);
 751                 }
 752
 753                 /* set our pointer to the new mapped area */
 754                 *data_ptrs[i] = mapinfo->bp[i]->b_data;
 755
 756                 mapinfo->num_bufs_used++;
 757         }
 758
 759         /*
 760          * Now that we've gotten this far, change ownership to the kernel
 761          * of the buffers so that we don't run afoul of returning to user
 762          * space with locks (on the buffer) held.
 763          */
 764         for (i = 0; i < numbufs; i++) {
 765                 BUF_KERNPROC(mapinfo->bp[i]);
 766         }
 767
 768
 769         return(0);
 770 }
 771
 772 /*
 773  * Unmap memory segments mapped into kernel virtual address space by
 774  * cam_periph_mapmem().
 775  */
 776 void
 777 cam_periph_unmapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo)
 778 {
 779         int numbufs, i;
 780         u_int8_t **data_ptrs[CAM_PERIPH_MAXMAPS];
 781
 782         if (mapinfo->num_bufs_used <= 0) {
 783                 /* allow ourselves to be swapped once again */
 784                 PRELE(curproc);
 785                 return;
 786         }
 787
 788         switch (ccb->ccb_h.func_code) {
 789         case XPT_DEV_MATCH:
 790                 numbufs = min(mapinfo->num_bufs_used, 2);
 791
 792                 if (numbufs == 1) {
 793                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.matches;
 794                 } else {
 795                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.patterns;
 796                         data_ptrs[1] = (u_int8_t **)&ccb->cdm.matches;
 797                 }
 798                 break;
 799         case XPT_SCSI_IO:
 800         case XPT_CONT_TARGET_IO:
 801                 data_ptrs[0] = &ccb->csio.data_ptr;
 802                 numbufs = min(mapinfo->num_bufs_used, 1);
 803                 break;
 804         case XPT_ATA_IO:
 805                 data_ptrs[0] = &ccb->ataio.data_ptr;
 806                 numbufs = min(mapinfo->num_bufs_used, 1);
 807                 break;
 808         default:
 809                 /* allow ourselves to be swapped once again */
 810                 PRELE(curproc);
 811                 return;
 812                 break; /* NOTREACHED */
 813         }
 814
 815         for (i = 0; i < numbufs; i++) {
 816                 /* Set the user's pointer back to the original value */
 817                 *data_ptrs[i] = mapinfo->bp[i]->b_saveaddr;
 818
 819                 /* unmap the buffer */
 820                 vunmapbuf(mapinfo->bp[i]);
 821
 822                 /* release the buffer */
 823                 relpbuf(mapinfo->bp[i], NULL);
 824         }
 825
 826         /* allow ourselves to be swapped once again */
 827         PRELE(curproc);
 828 }
 829
 830 union ccb *
 831 cam_periph_getccb(struct cam_periph *periph, u_int32_t priority)
 832 {
 833         struct ccb_hdr *ccb_h;
 834
 835         mtx_assert(periph->sim->mtx, MA_OWNED);
 836         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("entering cdgetccb\n"));
 837
 838         while (SLIST_FIRST(&periph->ccb_list) == NULL) {
 839                 if (periph->immediate_priority > priority)
 840                         periph->immediate_priority = priority;
 841                 xpt_schedule(periph, priority);
 842                 if ((SLIST_FIRST(&periph->ccb_list) != NULL)
 843                  && (SLIST_FIRST(&periph->ccb_list)->pinfo.priority == priority))
 844                         break;
 845                 mtx_assert(periph->sim->mtx, MA_OWNED);
 846                 mtx_sleep(&periph->ccb_list, periph->sim->mtx, PRIBIO, "cgticb",
 847                     0);
 848         }
 849
 850         ccb_h = SLIST_FIRST(&periph->ccb_list);
 851         SLIST_REMOVE_HEAD(&periph->ccb_list, periph_links.sle);
 852         return ((union ccb *)ccb_h);
 853 }
 854
 855 void
 856 cam_periph_ccbwait(union ccb *ccb)
 857 {
 858         struct cam_sim *sim;
 859
 860         sim = xpt_path_sim(ccb->ccb_h.path);
 861         if ((ccb->ccb_h.pinfo.index != CAM_UNQUEUED_INDEX)
 862          || ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_INPROG))
 863                 mtx_sleep(&ccb->ccb_h.cbfcnp, sim->mtx, PRIBIO, "cbwait", 0);
 864 }
 865
 866 int
 867 cam_periph_ioctl(struct cam_periph *periph, u_long cmd, caddr_t addr,
 868                  int (*error_routine)(union ccb *ccb,
 869                                       cam_flags camflags,
 870                                       u_int32_t sense_flags))
 871 {
 872         union ccb            *ccb;
 873         int                  error;
 874         int                  found;
 875
 876         error = found = 0;
 877
 878         switch(cmd){
 879         case CAMGETPASSTHRU:
 880                 ccb = cam_periph_getccb(periph, CAM_PRIORITY_NORMAL);
 881                 xpt_setup_ccb(&ccb->ccb_h,
 882                               ccb->ccb_h.path,
 883                               CAM_PRIORITY_NORMAL);
 884                 ccb->ccb_h.func_code = XPT_GDEVLIST;
 885
 886                 /*
 887                  * Basically, the point of this is that we go through
 888                  * getting the list of devices, until we find a passthrough
 889                  * device.  In the current version of the CAM code, the
 890                  * only way to determine what type of device we're dealing
 891                  * with is by its name.
 892                  */
 893                 while (found == 0) {
 894                         ccb->cgdl.index = 0;
 895                         ccb->cgdl.status = CAM_GDEVLIST_MORE_DEVS;
 896                         while (ccb->cgdl.status == CAM_GDEVLIST_MORE_DEVS) {
 897
 898                                 /* we want the next device in the list */
 899                                 xpt_action(ccb);
 900                                 if (strncmp(ccb->cgdl.periph_name,
 901                                     "pass", 4) == 0){
 902                                         found = 1;
 903                                         break;
 904                                 }
 905                         }
 906                         if ((ccb->cgdl.status == CAM_GDEVLIST_LAST_DEVICE) &&
 907                             (found == 0)) {
 908                                 ccb->cgdl.periph_name[0] = '\0';
 909                                 ccb->cgdl.unit_number = 0;
 910                                 break;
 911                         }
 912                 }
 913
 914                 /* copy the result back out */
 915                 bcopy(ccb, addr, sizeof(union ccb));
 916
 917                 /* and release the ccb */
 918                 xpt_release_ccb(ccb);
 919
 920                 break;
 921         default:
 922                 error = ENOTTY;
 923                 break;
 924         }
 925         return(error);
 926 }
 927
 928 int
 929 cam_periph_runccb(union ccb *ccb,
 930                   int (*error_routine)(union ccb *ccb,
 931                                        cam_flags camflags,
 932                                        u_int32_t sense_flags),
 933                   cam_flags camflags, u_int32_t sense_flags,
 934                   struct devstat *ds)
 935 {
 936         struct cam_sim *sim;
 937         int error;
 938
 939         error = 0;
 940         sim = xpt_path_sim(ccb->ccb_h.path);
 941         mtx_assert(sim->mtx, MA_OWNED);
 942
 943         /*
 944          * If the user has supplied a stats structure, and if we understand
 945          * this particular type of ccb, record the transaction start.
 946          */
 947         if ((ds != NULL) && (ccb->ccb_h.func_code == XPT_SCSI_IO ||
 948             ccb->ccb_h.func_code == XPT_ATA_IO))
 949                 devstat_start_transaction(ds, NULL);
 950
 951         xpt_action(ccb);
 952
 953         do {
 954                 cam_periph_ccbwait(ccb);
 955                 if ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP)
 956                         error = 0;
 957                 else if (error_routine != NULL)
 958                         error = (*error_routine)(ccb, camflags, sense_flags);
 959                 else
 960                         error = 0;
 961
 962         } while (error == ERESTART);
 963
 964         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) {
 965                 cam_release_devq(ccb->ccb_h.path,
 966                                  /* relsim_flags */0,
 967                                  /* openings */0,
 968                                  /* timeout */0,
 969                                  /* getcount_only */ FALSE);
 970                 ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
 971         }
 972
 973         if (ds != NULL) {
 974                 if (ccb->ccb_h.func_code == XPT_SCSI_IO) {
 975                         devstat_end_transaction(ds,
 976                                         ccb->csio.dxfer_len,
 977                                         ccb->csio.tag_action & 0x3,
 978                                         ((ccb->ccb_h.flags & CAM_DIR_MASK) ==
 979                                         CAM_DIR_NONE) ?  DEVSTAT_NO_DATA :
 980                                         (ccb->ccb_h.flags & CAM_DIR_OUT) ?
 981                                         DEVSTAT_WRITE :
 982                                         DEVSTAT_READ, NULL, NULL);
 983                 } else if (ccb->ccb_h.func_code == XPT_ATA_IO) {
 984                         devstat_end_transaction(ds,
 985                                         ccb->ataio.dxfer_len,
 986                                         ccb->ataio.tag_action & 0x3,
 987                                         ((ccb->ccb_h.flags & CAM_DIR_MASK) ==
 988                                         CAM_DIR_NONE) ?  DEVSTAT_NO_DATA :
 989                                         (ccb->ccb_h.flags & CAM_DIR_OUT) ?
 990                                         DEVSTAT_WRITE :
 991                                         DEVSTAT_READ, NULL, NULL);
 992                 }
 993         }
 994
 995         return(error);
 996 }
 997
 998 void
 999 cam_freeze_devq(struct cam_path *path)
1000 {
1001
1002         cam_freeze_devq_arg(path, 0, 0);
1003 }
1004
1005 void
1006 cam_freeze_devq_arg(struct cam_path *path, uint32_t flags, uint32_t arg)
1007 {
1008         struct ccb_relsim crs;
1009
1010         xpt_setup_ccb(&crs.ccb_h, path, CAM_PRIORITY_NONE);
1011         crs.ccb_h.func_code = XPT_FREEZE_QUEUE;
1012         crs.release_flags = flags;
1013         crs.openings = arg;
1014         crs.release_timeout = arg;
1015         xpt_action((union ccb *)&crs);
1016 }
1017
1018 u_int32_t
1019 cam_release_devq(struct cam_path *path, u_int32_t relsim_flags,
1020                  u_int32_t openings, u_int32_t arg,
1021                  int getcount_only)
1022 {
1023         struct ccb_relsim crs;
1024
1025         xpt_setup_ccb(&crs.ccb_h, path, CAM_PRIORITY_NORMAL);
1026         crs.ccb_h.func_code = XPT_REL_SIMQ;
1027         crs.ccb_h.flags = getcount_only ? CAM_DEV_QFREEZE : 0;
1028         crs.release_flags = relsim_flags;
1029         crs.openings = openings;
1030         crs.release_timeout = arg;
1031         xpt_action((union ccb *)&crs);
1032         return (crs.qfrozen_cnt);
1033 }
1034
1035 #define saved_ccb_ptr ppriv_ptr0
1036 #define recovery_depth ppriv_field1
1037 static void
1038 camperiphsensedone(struct cam_periph *periph, union ccb *done_ccb)
1039 {
1040         union ccb      *saved_ccb = (union ccb *)done_ccb->ccb_h.saved_ccb_ptr;
1041         cam_status      status;
1042         int             frozen = 0;
1043         u_int           sense_key;
1044         int             depth = done_ccb->ccb_h.recovery_depth;
1045
1046         status = done_ccb->ccb_h.status;
1047         if (status & CAM_DEV_QFRZN) {
1048                 frozen = 1;
1049                 /*
1050                  * Clear freeze flag now for case of retry,
1051                  * freeze will be dropped later.
1052                  */
1053                 done_ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
1054         }
1055         status &= CAM_STATUS_MASK;
1056         switch (status) {
1057         case CAM_REQ_CMP:
1058         {
1059                 /*
1060                  * If we manually retrieved sense into a CCB and got
1061                  * something other than "NO SENSE" send the updated CCB
1062                  * back to the client via xpt_done() to be processed via
1063                  * the error recovery code again.
1064                  */
1065                 sense_key = saved_ccb->csio.sense_data.flags;
1066                 sense_key &= SSD_KEY;
1067                 if (sense_key != SSD_KEY_NO_SENSE) {
1068                         saved_ccb->ccb_h.status |=
1069                             CAM_AUTOSNS_VALID;
1070                 } else {
1071                         saved_ccb->ccb_h.status &=
1072                             ~CAM_STATUS_MASK;
1073                         saved_ccb->ccb_h.status |=
1074                             CAM_AUTOSENSE_FAIL;
1075                 }
1076                 saved_ccb->csio.sense_resid = done_ccb->csio.resid;
1077                 bcopy(saved_ccb, done_ccb, sizeof(union ccb));
1078                 xpt_free_ccb(saved_ccb);
1079                 break;
1080         }
1081         default:
1082                 bcopy(saved_ccb, done_ccb, sizeof(union ccb));
1083                 xpt_free_ccb(saved_ccb);
1084                 done_ccb->ccb_h.status &= ~CAM_STATUS_MASK;
1085                 done_ccb->ccb_h.status |= CAM_AUTOSENSE_FAIL;
1086                 break;
1087         }
1088         periph->flags &= ~CAM_PERIPH_SENSE_INPROG;
1089         /*
1090          * If it is the end of recovery, drop freeze, taken due to
1091          * CAM_DEV_QFREEZE flag, set on recovery request.
1092          */
1093         if (depth == 0) {
1094                 cam_release_devq(done_ccb->ccb_h.path,
1095                          /*relsim_flags*/0,
1096                          /*openings*/0,
1097                          /*timeout*/0,
1098                          /*getcount_only*/0);
1099         }
1100         /*
1101          * Copy frozen flag from recovery request if it is set there
1102          * for some reason.
1103          */
1104         if (frozen != 0)
1105                 done_ccb->ccb_h.status |= CAM_DEV_QFRZN;
1106         (*done_ccb->ccb_h.cbfcnp)(periph, done_ccb);
1107 }
1108
1109 static void
1110 camperiphdone(struct cam_periph *periph, union ccb *done_ccb)
1111 {
1112         union ccb      *saved_ccb, *save_ccb;
1113         cam_status      status;
1114         int             frozen = 0;
1115         struct scsi_start_stop_unit *scsi_cmd;
1116         u_int32_t       relsim_flags, timeout;
1117
1118         status = done_ccb->ccb_h.status;
1119         if (status & CAM_DEV_QFRZN) {
1120                 frozen = 1;
1121                 /*
1122                  * Clear freeze flag now for case of retry,
1123                  * freeze will be dropped later.
1124                  */
1125                 done_ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
1126         }
1127
1128         timeout = 0;
1129         relsim_flags = 0;
1130         saved_ccb = (union ccb *)done_ccb->ccb_h.saved_ccb_ptr;
1131
1132         switch (status & CAM_STATUS_MASK) {
1133         case CAM_REQ_CMP:
1134         {
1135                 /*
1136                  * If we have successfully taken a device from the not
1137                  * ready to ready state, re-scan the device and re-get
1138                  * the inquiry information.  Many devices (mostly disks)
1139                  * don't properly report their inquiry information unless
1140                  * they are spun up.
1141                  */
1142                 scsi_cmd = (struct scsi_start_stop_unit *)
1143                                 &done_ccb->csio.cdb_io.cdb_bytes;
1144
1145                 if (scsi_cmd->opcode == START_STOP_UNIT)
1146                         xpt_async(AC_INQ_CHANGED,
1147                                   done_ccb->ccb_h.path, NULL);
1148                 goto final;
1149         }
1150         case CAM_SCSI_STATUS_ERROR:
1151                 scsi_cmd = (struct scsi_start_stop_unit *)
1152                                 &done_ccb->csio.cdb_io.cdb_bytes;
1153                 if (status & CAM_AUTOSNS_VALID) {
1154                         struct ccb_getdev cgd;
1155                         struct scsi_sense_data *sense;
1156                         int    error_code, sense_key, asc, ascq;
1157                         scsi_sense_action err_action;
1158
1159                         sense = &done_ccb->csio.sense_data;
1160                         scsi_extract_sense(sense, &error_code,
1161                                            &sense_key, &asc, &ascq);
1162                         /*
1163                          * Grab the inquiry data for this device.
1164                          */
1165                         xpt_setup_ccb(&cgd.ccb_h, done_ccb->ccb_h.path,
1166                             CAM_PRIORITY_NORMAL);
1167                         cgd.ccb_h.func_code = XPT_GDEV_TYPE;
1168                         xpt_action((union ccb *)&cgd);
1169                         err_action = scsi_error_action(&done_ccb->csio,
1170                                                        &cgd.inq_data, 0);
1171                         /*
1172                          * If the error is "invalid field in CDB",
1173                          * and the load/eject flag is set, turn the
1174                          * flag off and try again.  This is just in
1175                          * case the drive in question barfs on the
1176                          * load eject flag.  The CAM code should set
1177                          * the load/eject flag by default for
1178                          * removable media.
1179                          */
1180                         /* XXX KDM
1181                          * Should we check to see what the specific
1182                          * scsi status is??  Or does it not matter
1183                          * since we already know that there was an
1184                          * error, and we know what the specific
1185                          * error code was, and we know what the
1186                          * opcode is..
1187                          */
1188                         if ((scsi_cmd->opcode == START_STOP_UNIT) &&
1189                             ((scsi_cmd->how & SSS_LOEJ) != 0) &&
1190                              (asc == 0x24) && (ascq == 0x00) &&
1191                              (done_ccb->ccb_h.retry_count > 0)) {
1192
1193                                 scsi_cmd->how &= ~SSS_LOEJ;
1194                                 xpt_action(done_ccb);
1195                         } else if ((done_ccb->ccb_h.retry_count > 1)
1196                                 && ((err_action & SS_MASK) != SS_FAIL)) {
1197
1198                                 /*
1199                                  * In this case, the error recovery
1200                                  * command failed, but we've got
1201                                  * some retries left on it.  Give
1202                                  * it another try unless this is an
1203                                  * unretryable error.
1204                                  */
1205                                 /* set the timeout to .5 sec */
1206                                 relsim_flags =
1207                                         RELSIM_RELEASE_AFTER_TIMEOUT;
1208                                 timeout = 500;
1209                                 xpt_action(done_ccb);
1210                                 break;
1211                         } else {
1212                                 /*
1213                                  * Perform the final retry with the original
1214                                  * CCB so that final error processing is
1215                                  * performed by the owner of the CCB.
1216                                  */
1217                                 goto final;
1218                         }
1219                 } else {
1220                         save_ccb = xpt_alloc_ccb_nowait();
1221                         if (save_ccb == NULL)
1222                                 goto final;
1223                         bcopy(done_ccb, save_ccb, sizeof(*save_ccb));
1224                         periph->flags |= CAM_PERIPH_SENSE_INPROG;
1225                         /*
1226                          * Send a Request Sense to the device.  We
1227                          * assume that we are in a contingent allegiance
1228                          * condition so we do not tag this request.
1229                          */
1230                         scsi_request_sense(&done_ccb->csio, /*retries*/1,
1231                                            camperiphsensedone,
1232                                            &save_ccb->csio.sense_data,
1233                                            save_ccb->csio.sense_len,
1234                                            CAM_TAG_ACTION_NONE,
1235                                            /*sense_len*/SSD_FULL_SIZE,
1236                                            /*timeout*/5000);
1237                         done_ccb->ccb_h.pinfo.priority--;
1238                         done_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
1239                         done_ccb->ccb_h.saved_ccb_ptr = save_ccb;
1240                         done_ccb->ccb_h.recovery_depth++;
1241                         xpt_action(done_ccb);
1242                 }
1243                 break;
1244         default:
1245 final:
1246                 bcopy(saved_ccb, done_ccb, sizeof(*done_ccb));
1247                 xpt_free_ccb(saved_ccb);
1248                 periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG;
1249                 xpt_action(done_ccb);
1250                 break;
1251         }
1252
1253         /* decrement the retry count */
1254         /*
1255          * XXX This isn't appropriate in all cases.  Restructure,
1256          *     so that the retry count is only decremented on an
1257          *     actual retry.  Remeber that the orignal ccb had its
1258          *     retry count dropped before entering recovery, so
1259          *     doing it again is a bug.
1260          */
1261         if (done_ccb->ccb_h.retry_count > 0)
1262                 done_ccb->ccb_h.retry_count--;
1263         /*
1264          * Drop freeze taken due to CAM_DEV_QFREEZE flag set on recovery
1265          * request.
1266          */
1267         cam_release_devq(done_ccb->ccb_h.path,
1268                          /*relsim_flags*/relsim_flags,
1269                          /*openings*/0,
1270                          /*timeout*/timeout,
1271                          /*getcount_only*/0);
1272         /* Drop freeze taken, if this recovery request got error. */
1273         if (frozen != 0) {
1274                 cam_release_devq(done_ccb->ccb_h.path,
1275                          /*relsim_flags*/0,
1276                          /*openings*/0,
1277                          /*timeout*/0,
1278                          /*getcount_only*/0);
1279         }
1280 }
1281
1282 /*
1283  * Generic Async Event handler.  Peripheral drivers usually
1284  * filter out the events that require personal attention,
1285  * and leave the rest to this function.
1286  */
1287 void
1288 cam_periph_async(struct cam_periph *periph, u_int32_t code,
1289                  struct cam_path *path, void *arg)
1290 {
1291         switch (code) {
1292         case AC_LOST_DEVICE:
1293                 cam_periph_invalidate(periph);
1294                 break;
1295         default:
1296                 break;
1297         }
1298 }
1299
1300 void
1301 cam_periph_bus_settle(struct cam_periph *periph, u_int bus_settle)
1302 {
1303         struct ccb_getdevstats cgds;
1304
1305         xpt_setup_ccb(&cgds.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
1306         cgds.ccb_h.func_code = XPT_GDEV_STATS;
1307         xpt_action((union ccb *)&cgds);
1308         cam_periph_freeze_after_event(periph, &cgds.last_reset, bus_settle);
1309 }
1310
1311 void
1312 cam_periph_freeze_after_event(struct cam_periph *periph,
1313                               struct timeval* event_time, u_int duration_ms)
1314 {
1315         struct timeval delta;
1316         struct timeval duration_tv;
1317
1318         microtime(&delta);
1319         timevalsub(&delta, event_time);
1320         duration_tv.tv_sec = duration_ms / 1000;
1321         duration_tv.tv_usec = (duration_ms % 1000) * 1000;
1322         if (timevalcmp(&delta, &duration_tv, <)) {
1323                 timevalsub(&duration_tv, &delta);
1324
1325                 duration_ms = duration_tv.tv_sec * 1000;
1326                 duration_ms += duration_tv.tv_usec / 1000;
1327                 cam_freeze_devq(periph->path);
1328                 cam_release_devq(periph->path,
1329                                 RELSIM_RELEASE_AFTER_TIMEOUT,
1330                                 /*reduction*/0,
1331                                 /*timeout*/duration_ms,
1332                                 /*getcount_only*/0);
1333         }
1334
1335 }
1336
1337 static int
1338 camperiphscsistatuserror(union ccb *ccb, cam_flags camflags,
1339                          u_int32_t sense_flags,
1340                          int *openings, u_int32_t *relsim_flags,
1341                          u_int32_t *timeout, const char **action_string)
1342 {
1343         int error;
1344
1345         switch (ccb->csio.scsi_status) {
1346         case SCSI_STATUS_OK:
1347         case SCSI_STATUS_COND_MET:
1348         case SCSI_STATUS_INTERMED:
1349         case SCSI_STATUS_INTERMED_COND_MET:
1350                 error = 0;
1351                 break;
1352         case SCSI_STATUS_CMD_TERMINATED:
1353         case SCSI_STATUS_CHECK_COND:
1354                 if (bootverbose)
1355                         xpt_print(ccb->ccb_h.path, "SCSI status error\n");
1356                 error = camperiphscsisenseerror(ccb,
1357                                                 camflags,
1358                                                 sense_flags,
1359                                                 openings,
1360                                                 relsim_flags,
1361                                                 timeout,
1362                                                 action_string);
1363                 break;
1364         case SCSI_STATUS_QUEUE_FULL:
1365         {
1366                 /* no decrement */
1367                 struct ccb_getdevstats cgds;
1368
1369                 /*
1370                  * First off, find out what the current
1371                  * transaction counts are.
1372                  */
1373                 xpt_setup_ccb(&cgds.ccb_h,
1374                               ccb->ccb_h.path,
1375                               CAM_PRIORITY_NORMAL);
1376                 cgds.ccb_h.func_code = XPT_GDEV_STATS;
1377                 xpt_action((union ccb *)&cgds);
1378
1379                 /*
1380                  * If we were the only transaction active, treat
1381                  * the QUEUE FULL as if it were a BUSY condition.
1382                  */
1383                 if (cgds.dev_active != 0) {
1384                         int total_openings;
1385
1386                         /*
1387                          * Reduce the number of openings to
1388                          * be 1 less than the amount it took
1389                          * to get a queue full bounded by the
1390                          * minimum allowed tag count for this
1391                          * device.
1392                          */
1393                         total_openings = cgds.dev_active + cgds.dev_openings;
1394                         *openings = cgds.dev_active;
1395                         if (*openings < cgds.mintags)
1396                                 *openings = cgds.mintags;
1397                         if (*openings < total_openings)
1398                                 *relsim_flags = RELSIM_ADJUST_OPENINGS;
1399                         else {
1400                                 /*
1401                                  * Some devices report queue full for
1402                                  * temporary resource shortages.  For
1403                                  * this reason, we allow a minimum
1404                                  * tag count to be entered via a
1405                                  * quirk entry to prevent the queue
1406                                  * count on these devices from falling
1407                                  * to a pessimisticly low value.  We
1408                                  * still wait for the next successful
1409                                  * completion, however, before queueing
1410                                  * more transactions to the device.
1411                                  */
1412                                 *relsim_flags = RELSIM_RELEASE_AFTER_CMDCMPLT;
1413                         }
1414                         *timeout = 0;
1415                         error = ERESTART;
1416                         if (bootverbose) {
1417                                 xpt_print(ccb->ccb_h.path, "Queue full\n");
1418                         }
1419                         break;
1420                 }
1421                 /* FALLTHROUGH */
1422         }
1423         case SCSI_STATUS_BUSY:
1424                 /*
1425                  * Restart the queue after either another
1426                  * command completes or a 1 second timeout.
1427                  */
1428                 if (bootverbose) {
1429                         xpt_print(ccb->ccb_h.path, "Device busy\n");
1430                 }
1431                 if (ccb->ccb_h.retry_count > 0) {
1432                         ccb->ccb_h.retry_count--;
1433                         error = ERESTART;
1434                         *relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT
1435                                       | RELSIM_RELEASE_AFTER_CMDCMPLT;
1436                         *timeout = 1000;
1437                 } else {
1438                         error = EIO;
1439                 }
1440                 break;
1441         case SCSI_STATUS_RESERV_CONFLICT:
1442                 xpt_print(ccb->ccb_h.path, "Reservation conflict\n");
1443                 error = EIO;
1444                 break;
1445         default:
1446                 xpt_print(ccb->ccb_h.path, "SCSI status 0x%x\n",
1447                     ccb->csio.scsi_status);
1448                 error = EIO;
1449                 break;
1450         }
1451         return (error);
1452 }
1453
1454 static int
1455 camperiphscsisenseerror(union ccb *ccb, cam_flags camflags,
1456                         u_int32_t sense_flags,
1457                        int *openings, u_int32_t *relsim_flags,
1458                        u_int32_t *timeout, const char **action_string)
1459 {
1460         struct cam_periph *periph;
1461         union ccb *orig_ccb = ccb;
1462         int error;
1463
1464         periph = xpt_path_periph(ccb->ccb_h.path);
1465         if (periph->flags &
1466             (CAM_PERIPH_RECOVERY_INPROG | CAM_PERIPH_SENSE_INPROG)) {
1467                 /*
1468                  * If error recovery is already in progress, don't attempt
1469                  * to process this error, but requeue it unconditionally
1470                  * and attempt to process it once error recovery has
1471                  * completed.  This failed command is probably related to
1472                  * the error that caused the currently active error recovery
1473                  * action so our  current recovery efforts should also
1474                  * address this command.  Be aware that the error recovery
1475                  * code assumes that only one recovery action is in progress
1476                  * on a particular peripheral instance at any given time
1477                  * (e.g. only one saved CCB for error recovery) so it is
1478                  * imperitive that we don't violate this assumption.
1479                  */
1480                 error = ERESTART;
1481         } else {
1482                 scsi_sense_action err_action;
1483                 struct ccb_getdev cgd;
1484
1485                 /*
1486                  * Grab the inquiry data for this device.
1487                  */
1488                 xpt_setup_ccb(&cgd.ccb_h, ccb->ccb_h.path, CAM_PRIORITY_NORMAL);
1489                 cgd.ccb_h.func_code = XPT_GDEV_TYPE;
1490                 xpt_action((union ccb *)&cgd);
1491
1492                 if ((ccb->ccb_h.status & CAM_AUTOSNS_VALID) != 0)
1493                         err_action = scsi_error_action(&ccb->csio,
1494                                                        &cgd.inq_data,
1495                                                        sense_flags);
1496                 else if ((ccb->ccb_h.flags & CAM_DIS_AUTOSENSE) == 0)
1497                         err_action = SS_REQSENSE;
1498                 else
1499                         err_action = SS_RETRY|SSQ_DECREMENT_COUNT|EIO;
1500
1501                 error = err_action & SS_ERRMASK;
1502
1503                 /*
1504                  * If the recovery action will consume a retry,
1505                  * make sure we actually have retries available.
1506                  */
1507                 if ((err_action & SSQ_DECREMENT_COUNT) != 0) {
1508                         if (ccb->ccb_h.retry_count > 0 &&
1509                             (periph->flags & CAM_PERIPH_INVALID) == 0)
1510                                 ccb->ccb_h.retry_count--;
1511                         else {
1512                                 *action_string = "Retries exhausted";
1513                                 goto sense_error_done;
1514                         }
1515                 }
1516
1517                 if ((err_action & SS_MASK) >= SS_START) {
1518                         /*
1519                          * Do common portions of commands that
1520                          * use recovery CCBs.
1521                          */
1522                         orig_ccb = xpt_alloc_ccb_nowait();
1523                         if (orig_ccb == NULL) {
1524                                 *action_string = "Can't allocate recovery CCB";
1525                                 goto sense_error_done;
1526                         }
1527                         /*
1528                          * Clear freeze flag for original request here, as
1529                          * this freeze will be dropped as part of ERESTART.
1530                          */
1531                         ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
1532                         bcopy(ccb, orig_ccb, sizeof(*orig_ccb));
1533                 }
1534
1535                 switch (err_action & SS_MASK) {
1536                 case SS_NOP:
1537                         *action_string = "No recovery action needed";
1538                         error = 0;
1539                         break;
1540                 case SS_RETRY:
1541                         *action_string = "Retrying command (per sense data)";
1542                         error = ERESTART;
1543                         break;
1544                 case SS_FAIL:
1545                         *action_string = "Unretryable error";
1546                         break;
1547                 case SS_START:
1548                 {
1549                         int le;
1550                         if (SID_TYPE(&cgd.inq_data) == T_SEQUENTIAL) {
1551                                 xpt_free_ccb(orig_ccb);
1552                                 ccb->ccb_h.status |= CAM_DEV_QFRZN;
1553                                 *action_string = "Will not autostart a "
1554                                     "sequential access device";
1555                                 err_action = SS_FAIL;
1556                                 error = EIO;
1557                                 break;
1558                         }
1559
1560                         /*
1561                          * Send a start unit command to the device, and
1562                          * then retry the command.
1563                          */
1564                         *action_string = "Attempting to start unit";
1565                         periph->flags |= CAM_PERIPH_RECOVERY_INPROG;
1566
1567                         /*
1568                          * Check for removable media and set
1569                          * load/eject flag appropriately.
1570                          */
1571                         if (SID_IS_REMOVABLE(&cgd.inq_data))
1572                                 le = TRUE;
1573                         else
1574                                 le = FALSE;
1575
1576                         scsi_start_stop(&ccb->csio,
1577                                         /*retries*/1,
1578                                         camperiphdone,
1579                                         MSG_SIMPLE_Q_TAG,
1580                                         /*start*/TRUE,
1581                                         /*load/eject*/le,
1582                                         /*immediate*/FALSE,
1583                                         SSD_FULL_SIZE,
1584                                         /*timeout*/50000);
1585                         break;
1586                 }
1587                 case SS_TUR:
1588                 {
1589                         /*
1590                          * Send a Test Unit Ready to the device.
1591                          * If the 'many' flag is set, we send 120
1592                          * test unit ready commands, one every half
1593                          * second.  Otherwise, we just send one TUR.
1594                          * We only want to do this if the retry
1595                          * count has not been exhausted.
1596                          */
1597                         int retries;
1598
1599                         if ((err_action & SSQ_MANY) != 0) {
1600                                 *action_string = "Polling device for readiness";
1601                                 retries = 120;
1602                         } else {
1603                                 *action_string = "Testing device for readiness";
1604                                 retries = 1;
1605                         }
1606                         periph->flags |= CAM_PERIPH_RECOVERY_INPROG;
1607                         scsi_test_unit_ready(&ccb->csio,
1608                                              retries,
1609                                              camperiphdone,
1610                                              MSG_SIMPLE_Q_TAG,
1611                                              SSD_FULL_SIZE,
1612                                              /*timeout*/5000);
1613
1614                         /*
1615                          * Accomplish our 500ms delay by deferring
1616                          * the release of our device queue appropriately.
1617                          */
1618                         *relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
1619                         *timeout = 500;
1620                         break;
1621                 }
1622                 case SS_REQSENSE:
1623                 {
1624                         *action_string = "Requesting SCSI sense data";
1625                         periph->flags |= CAM_PERIPH_SENSE_INPROG;
1626                         /*
1627                          * Send a Request Sense to the device.  We
1628                          * assume that we are in a contingent allegiance
1629                          * condition so we do not tag this request.
1630                          */
1631                         scsi_request_sense(&ccb->csio, /*retries*/1,
1632                                            camperiphsensedone,
1633                                            &orig_ccb->csio.sense_data,
1634                                            orig_ccb->csio.sense_len,
1635                                            CAM_TAG_ACTION_NONE,
1636                                            /*sense_len*/SSD_FULL_SIZE,
1637                                            /*timeout*/5000);
1638                         break;
1639                 }
1640                 default:
1641                         panic("Unhandled error action %x", err_action);
1642                 }
1643
1644                 if ((err_action & SS_MASK) >= SS_START) {
1645                         /*
1646                          * Drop the priority, so that the recovery
1647                          * CCB is the first to execute.  Freeze the queue
1648                          * after this command is sent so that we can
1649                          * restore the old csio and have it queued in
1650                          * the proper order before we release normal
1651                          * transactions to the device.
1652                          */
1653                         ccb->ccb_h.pinfo.priority--;
1654                         ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
1655                         ccb->ccb_h.saved_ccb_ptr = orig_ccb;
1656                         ccb->ccb_h.recovery_depth = 0;
1657                         error = ERESTART;
1658                 }
1659
1660 sense_error_done:
1661                 if ((err_action & SSQ_PRINT_SENSE) != 0
1662                  && (ccb->ccb_h.status & CAM_AUTOSNS_VALID) != 0)
1663                         cam_error_print(orig_ccb, CAM_ESF_ALL, CAM_EPF_ALL);
1664         }
1665         return (error);
1666 }
1667
1668 /*
1669  * Generic error handler.  Peripheral drivers usually filter
1670  * out the errors that they handle in a unique mannor, then
1671  * call this function.
1672  */
1673 int
1674 cam_periph_error(union ccb *ccb, cam_flags camflags,
1675                  u_int32_t sense_flags, union ccb *save_ccb)
1676 {
1677         struct cam_periph *periph;
1678         const char *action_string;
1679         cam_status  status;
1680         int         frozen;
1681         int         error, printed = 0;
1682         int         openings;
1683         u_int32_t   relsim_flags;
1684         u_int32_t   timeout = 0;
1685
1686         periph = xpt_path_periph(ccb->ccb_h.path);
1687         action_string = NULL;
1688         status = ccb->ccb_h.status;
1689         frozen = (status & CAM_DEV_QFRZN) != 0;
1690         status &= CAM_STATUS_MASK;
1691         openings = relsim_flags = 0;
1692
1693         switch (status) {
1694         case CAM_REQ_CMP:
1695                 error = 0;
1696                 break;
1697         case CAM_SCSI_STATUS_ERROR:
1698                 error = camperiphscsistatuserror(ccb,
1699                                                  camflags,
1700                                                  sense_flags,
1701                                                  &openings,
1702                                                  &relsim_flags,
1703                                                  &timeout,
1704                                                  &action_string);
1705                 break;
1706         case CAM_AUTOSENSE_FAIL:
1707                 xpt_print(ccb->ccb_h.path, "AutoSense failed\n");
1708                 error = EIO;    /* we have to kill the command */
1709                 break;
1710         case CAM_ATA_STATUS_ERROR:
1711                 if (bootverbose && printed == 0) {
1712                         xpt_print(ccb->ccb_h.path, "ATA status error\n");
1713                         cam_error_print(ccb, CAM_ESF_ALL, CAM_EPF_ALL);
1714                         printed++;
1715                 }
1716                 /* FALLTHROUGH */
1717         case CAM_REQ_CMP_ERR:
1718                 if (bootverbose && printed == 0) {
1719                         xpt_print(ccb->ccb_h.path,
1720                             "Request completed with CAM_REQ_CMP_ERR\n");
1721                         printed++;
1722                 }
1723                 /* FALLTHROUGH */
1724         case CAM_CMD_TIMEOUT:
1725                 if (bootverbose && printed == 0) {
1726                         xpt_print(ccb->ccb_h.path, "Command timed out\n");
1727                         printed++;
1728                 }
1729                 /* FALLTHROUGH */
1730         case CAM_UNEXP_BUSFREE:
1731                 if (bootverbose && printed == 0) {
1732                         xpt_print(ccb->ccb_h.path, "Unexpected Bus Free\n");
1733                         printed++;
1734                 }
1735                 /* FALLTHROUGH */
1736         case CAM_UNCOR_PARITY:
1737                 if (bootverbose && printed == 0) {
1738                         xpt_print(ccb->ccb_h.path,
1739                             "Uncorrected parity error\n");
1740                         printed++;
1741                 }
1742                 /* FALLTHROUGH */
1743         case CAM_DATA_RUN_ERR:
1744                 if (bootverbose && printed == 0) {
1745                         xpt_print(ccb->ccb_h.path, "Data overrun\n");
1746                         printed++;
1747                 }
1748                 /* decrement the number of retries */
1749                 if (ccb->ccb_h.retry_count > 0 &&
1750                     (periph->flags & CAM_PERIPH_INVALID) == 0) {
1751                         ccb->ccb_h.retry_count--;
1752                         error = ERESTART;
1753                 } else {
1754                         action_string = "Retries exhausted";
1755                         error = EIO;
1756                 }
1757                 break;
1758         case CAM_UA_ABORT:
1759         case CAM_UA_TERMIO:
1760         case CAM_MSG_REJECT_REC:
1761                 /* XXX Don't know that these are correct */
1762                 error = EIO;
1763                 break;
1764         case CAM_SEL_TIMEOUT:
1765                 if ((camflags & CAM_RETRY_SELTO) != 0) {
1766                         if (ccb->ccb_h.retry_count > 0 &&
1767                             (periph->flags & CAM_PERIPH_INVALID) == 0) {
1768
1769                                 ccb->ccb_h.retry_count--;
1770                                 error = ERESTART;
1771                                 if (bootverbose && printed == 0) {
1772                                         xpt_print(ccb->ccb_h.path,
1773                                             "Selection timeout\n");
1774                                         printed++;
1775                                 }
1776
1777                                 /*
1778                                  * Wait a bit to give the device
1779                                  * time to recover before we try again.
1780                                  */
1781                                 relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
1782                                 timeout = periph_selto_delay;
1783                                 break;
1784                         }
1785                         action_string = "Retries exhausted";
1786                 }
1787                 /* FALLTHROUGH */
1788         case CAM_DEV_NOT_THERE:
1789         {
1790                 struct cam_path *newpath;
1791                 lun_id_t lun_id;
1792
1793                 error = ENXIO;
1794
1795                 /*
1796                  * For a selection timeout, we consider all of the LUNs on
1797                  * the target to be gone.  If the status is CAM_DEV_NOT_THERE,
1798                  * then we only get rid of the device(s) specified by the
1799                  * path in the original CCB.
1800                  */
1801                 if (status == CAM_DEV_NOT_THERE)
1802                         lun_id = xpt_path_lun_id(ccb->ccb_h.path);
1803                 else
1804                         lun_id = CAM_LUN_WILDCARD;
1805
1806                 /* Should we do more if we can't create the path?? */
1807                 if (xpt_create_path(&newpath, periph,
1808                                     xpt_path_path_id(ccb->ccb_h.path),
1809                                     xpt_path_target_id(ccb->ccb_h.path),
1810                                     lun_id) != CAM_REQ_CMP)
1811                         break;
1812
1813                 /*
1814                  * Let peripheral drivers know that this device has gone
1815                  * away.
1816                  */
1817                 xpt_async(AC_LOST_DEVICE, newpath, NULL);
1818                 xpt_free_path(newpath);
1819                 break;
1820         }
1821         case CAM_REQ_INVALID:
1822         case CAM_PATH_INVALID:
1823         case CAM_NO_HBA:
1824         case CAM_PROVIDE_FAIL:
1825         case CAM_REQ_TOO_BIG:
1826         case CAM_LUN_INVALID:
1827         case CAM_TID_INVALID:
1828                 error = EINVAL;
1829                 break;
1830         case CAM_SCSI_BUS_RESET:
1831         case CAM_BDR_SENT:
1832                 /*
1833                  * Commands that repeatedly timeout and cause these
1834                  * kinds of error recovery actions, should return
1835                  * CAM_CMD_TIMEOUT, which allows us to safely assume
1836                  * that this command was an innocent bystander to
1837                  * these events and should be unconditionally
1838                  * retried.
1839                  */
1840                 if (bootverbose && printed == 0) {
1841                         xpt_print_path(ccb->ccb_h.path);
1842                         if (status == CAM_BDR_SENT)
1843                                 printf("Bus Device Reset sent\n");
1844                         else
1845                                 printf("Bus Reset issued\n");
1846                         printed++;
1847                 }
1848                 /* FALLTHROUGH */
1849         case CAM_REQUEUE_REQ:
1850                 /* Unconditional requeue */
1851                 if (bootverbose && printed == 0) {
1852                         xpt_print(ccb->ccb_h.path, "Request requeued\n");
1853                         printed++;
1854                 }
1855                 if ((periph->flags & CAM_PERIPH_INVALID) == 0)
1856                         error = ERESTART;
1857                 else {
1858                         action_string = "Retries exhausted";
1859                         error = EIO;
1860                 }
1861                 break;
1862         case CAM_RESRC_UNAVAIL:
1863                 /* Wait a bit for the resource shortage to abate. */
1864                 timeout = periph_noresrc_delay;
1865                 /* FALLTHROUGH */
1866         case CAM_BUSY:
1867                 if (timeout == 0) {
1868                         /* Wait a bit for the busy condition to abate. */
1869                         timeout = periph_busy_delay;
1870                 }
1871                 relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
1872                 /* FALLTHROUGH */
1873         default:
1874                 /* decrement the number of retries */
1875                 if (ccb->ccb_h.retry_count > 0 &&
1876                     (periph->flags & CAM_PERIPH_INVALID) == 0) {
1877                         ccb->ccb_h.retry_count--;
1878                         error = ERESTART;
1879                         if (bootverbose && printed == 0) {
1880                                 xpt_print(ccb->ccb_h.path, "CAM status 0x%x\n",
1881                                     status);
1882                                 printed++;
1883                         }
1884                 } else {
1885                         error = EIO;
1886                         action_string = "Retries exhausted";
1887                 }
1888                 break;
1889         }
1890
1891         /*
1892          * If we have and error and are booting verbosely, whine
1893          * *unless* this was a non-retryable selection timeout.
1894          */
1895         if (error != 0 && bootverbose &&
1896             !(status == CAM_SEL_TIMEOUT && (camflags & CAM_RETRY_SELTO) == 0)) {
1897                 if (error != ERESTART) {
1898                         if (action_string == NULL)
1899                                 action_string = "Unretryable error";
1900                         xpt_print(ccb->ccb_h.path, "Error %d, %s\n",
1901                             error, action_string);
1902                 } else if (action_string != NULL)
1903                         xpt_print(ccb->ccb_h.path, "%s\n", action_string);
1904                 else
1905                         xpt_print(ccb->ccb_h.path, "Retrying command\n");
1906         }
1907
1908         /* Attempt a retry */
1909         if (error == ERESTART || error == 0) {
1910                 if (frozen != 0)
1911                         ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
1912                 if (error == ERESTART)
1913                         xpt_action(ccb);
1914                 if (frozen != 0)
1915                         cam_release_devq(ccb->ccb_h.path,
1916                                          relsim_flags,
1917                                          openings,
1918                                          timeout,
1919                                          /*getcount_only*/0);
1920         }
1921
1922         return (error);
1923 }