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 <sys/sbuf.h>
  46 #include <vm/vm.h>
  47 #include <vm/vm_extern.h>
  48
  49 #include <cam/cam.h>
  50 #include <cam/cam_ccb.h>
  51 #include <cam/cam_queue.h>
  52 #include <cam/cam_xpt_periph.h>
  53 #include <cam/cam_periph.h>
  54 #include <cam/cam_debug.h>
  55 #include <cam/cam_sim.h>
  56
  57 #include <cam/scsi/scsi_all.h>
  58 #include <cam/scsi/scsi_message.h>
  59 #include <cam/scsi/scsi_pass.h>
  60
  61 static  u_int           camperiphnextunit(struct periph_driver *p_drv,
  62                                           u_int newunit, int wired,
  63                                           path_id_t pathid, target_id_t target,
  64                                           lun_id_t lun);
  65 static  u_int           camperiphunit(struct periph_driver *p_drv,
  66                                       path_id_t pathid, target_id_t target,
  67                                       lun_id_t lun);
  68 static  void            camperiphdone(struct cam_periph *periph,
  69                                         union ccb *done_ccb);
  70 static  void            camperiphfree(struct cam_periph *periph);
  71 static int              camperiphscsistatuserror(union ccb *ccb,
  72                                                 union ccb **orig_ccb,
  73                                                  cam_flags camflags,
  74                                                  u_int32_t sense_flags,
  75                                                  int *openings,
  76                                                  u_int32_t *relsim_flags,
  77                                                  u_int32_t *timeout,
  78                                                  u_int32_t  *action,
  79                                                  const char **action_string);
  80 static  int             camperiphscsisenseerror(union ccb *ccb,
  81                                                 union ccb **orig_ccb,
  82                                                 cam_flags camflags,
  83                                                 u_int32_t sense_flags,
  84                                                 int *openings,
  85                                                 u_int32_t *relsim_flags,
  86                                                 u_int32_t *timeout,
  87                                                 u_int32_t *action,
  88                                                 const char **action_string);
  89 static void             cam_periph_devctl_notify(union ccb *ccb);
  90
  91 static int nperiph_drivers;
  92 static int initialized = 0;
  93 struct periph_driver **periph_drivers;
  94
  95 static MALLOC_DEFINE(M_CAMPERIPH, "CAM periph", "CAM peripheral buffers");
  96
  97 static int periph_selto_delay = 1000;
  98 TUNABLE_INT("kern.cam.periph_selto_delay", &periph_selto_delay);
  99 static int periph_noresrc_delay = 500;
 100 TUNABLE_INT("kern.cam.periph_noresrc_delay", &periph_noresrc_delay);
 101 static int periph_busy_delay = 500;
 102 TUNABLE_INT("kern.cam.periph_busy_delay", &periph_busy_delay);
 103
 104
 105 void
 106 periphdriver_register(void *data)
 107 {
 108         struct periph_driver *drv = (struct periph_driver *)data;
 109         struct periph_driver **newdrivers, **old;
 110         int ndrivers;
 111
 112 again:
 113         ndrivers = nperiph_drivers + 2;
 114         newdrivers = malloc(sizeof(*newdrivers) * ndrivers, M_CAMPERIPH,
 115                             M_WAITOK);
 116         xpt_lock_buses();
 117         if (ndrivers != nperiph_drivers + 2) {
 118                 /*
 119                  * Lost race against itself; go around.
 120                  */
 121                 xpt_unlock_buses();
 122                 free(newdrivers, M_CAMPERIPH);
 123                 goto again;
 124         }
 125         if (periph_drivers)
 126                 bcopy(periph_drivers, newdrivers,
 127                       sizeof(*newdrivers) * nperiph_drivers);
 128         newdrivers[nperiph_drivers] = drv;
 129         newdrivers[nperiph_drivers + 1] = NULL;
 130         old = periph_drivers;
 131         periph_drivers = newdrivers;
 132         nperiph_drivers++;
 133         xpt_unlock_buses();
 134         if (old)
 135                 free(old, M_CAMPERIPH);
 136         /* If driver marked as early or it is late now, initialize it. */
 137         if (((drv->flags & CAM_PERIPH_DRV_EARLY) != 0 && initialized > 0) ||
 138             initialized > 1)
 139                 (*drv->init)();
 140 }
 141
 142 void
 143 periphdriver_init(int level)
 144 {
 145         int     i, early;
 146
 147         initialized = max(initialized, level);
 148         for (i = 0; periph_drivers[i] != NULL; i++) {
 149                 early = (periph_drivers[i]->flags & CAM_PERIPH_DRV_EARLY) ? 1 : 2;
 150                 if (early == initialized)
 151                         (*periph_drivers[i]->init)();
 152         }
 153 }
 154
 155 cam_status
 156 cam_periph_alloc(periph_ctor_t *periph_ctor,
 157                  periph_oninv_t *periph_oninvalidate,
 158                  periph_dtor_t *periph_dtor, periph_start_t *periph_start,
 159                  char *name, cam_periph_type type, struct cam_path *path,
 160                  ac_callback_t *ac_callback, ac_code code, void *arg)
 161 {
 162         struct          periph_driver **p_drv;
 163         struct          cam_sim *sim;
 164         struct          cam_periph *periph;
 165         struct          cam_periph *cur_periph;
 166         path_id_t       path_id;
 167         target_id_t     target_id;
 168         lun_id_t        lun_id;
 169         cam_status      status;
 170         u_int           init_level;
 171
 172         init_level = 0;
 173         /*
 174          * Handle Hot-Plug scenarios.  If there is already a peripheral
 175          * of our type assigned to this path, we are likely waiting for
 176          * final close on an old, invalidated, peripheral.  If this is
 177          * the case, queue up a deferred call to the peripheral's async
 178          * handler.  If it looks like a mistaken re-allocation, complain.
 179          */
 180         if ((periph = cam_periph_find(path, name)) != NULL) {
 181
 182                 if ((periph->flags & CAM_PERIPH_INVALID) != 0
 183                  && (periph->flags & CAM_PERIPH_NEW_DEV_FOUND) == 0) {
 184                         periph->flags |= CAM_PERIPH_NEW_DEV_FOUND;
 185                         periph->deferred_callback = ac_callback;
 186                         periph->deferred_ac = code;
 187                         return (CAM_REQ_INPROG);
 188                 } else {
 189                         printf("cam_periph_alloc: attempt to re-allocate "
 190                                "valid device %s%d rejected flags %#x "
 191                                "refcount %d\n", periph->periph_name,
 192                                periph->unit_number, periph->flags,
 193                                periph->refcount);
 194                 }
 195                 return (CAM_REQ_INVALID);
 196         }
 197
 198         periph = (struct cam_periph *)malloc(sizeof(*periph), M_CAMPERIPH,
 199                                              M_NOWAIT|M_ZERO);
 200
 201         if (periph == NULL)
 202                 return (CAM_RESRC_UNAVAIL);
 203
 204         init_level++;
 205
 206
 207         sim = xpt_path_sim(path);
 208         path_id = xpt_path_path_id(path);
 209         target_id = xpt_path_target_id(path);
 210         lun_id = xpt_path_lun_id(path);
 211         periph->periph_start = periph_start;
 212         periph->periph_dtor = periph_dtor;
 213         periph->periph_oninval = periph_oninvalidate;
 214         periph->type = type;
 215         periph->periph_name = name;
 216         periph->scheduled_priority = CAM_PRIORITY_NONE;
 217         periph->immediate_priority = CAM_PRIORITY_NONE;
 218         periph->refcount = 1;           /* Dropped by invalidation. */
 219         periph->sim = sim;
 220         SLIST_INIT(&periph->ccb_list);
 221         status = xpt_create_path(&path, periph, path_id, target_id, lun_id);
 222         if (status != CAM_REQ_CMP)
 223                 goto failure;
 224         periph->path = path;
 225
 226         xpt_lock_buses();
 227         for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
 228                 if (strcmp((*p_drv)->driver_name, name) == 0)
 229                         break;
 230         }
 231         if (*p_drv == NULL) {
 232                 printf("cam_periph_alloc: invalid periph name '%s'\n", name);
 233                 xpt_unlock_buses();
 234                 xpt_free_path(periph->path);
 235                 free(periph, M_CAMPERIPH);
 236                 return (CAM_REQ_INVALID);
 237         }
 238         periph->unit_number = camperiphunit(*p_drv, path_id, target_id, lun_id);
 239         cur_periph = TAILQ_FIRST(&(*p_drv)->units);
 240         while (cur_periph != NULL
 241             && cur_periph->unit_number < periph->unit_number)
 242                 cur_periph = TAILQ_NEXT(cur_periph, unit_links);
 243         if (cur_periph != NULL) {
 244                 KASSERT(cur_periph->unit_number != periph->unit_number, ("duplicate units on periph list"));
 245                 TAILQ_INSERT_BEFORE(cur_periph, periph, unit_links);
 246         } else {
 247                 TAILQ_INSERT_TAIL(&(*p_drv)->units, periph, unit_links);
 248                 (*p_drv)->generation++;
 249         }
 250         xpt_unlock_buses();
 251
 252         init_level++;
 253
 254         status = xpt_add_periph(periph);
 255         if (status != CAM_REQ_CMP)
 256                 goto failure;
 257
 258         init_level++;
 259         CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph created\n"));
 260
 261         status = periph_ctor(periph, arg);
 262
 263         if (status == CAM_REQ_CMP)
 264                 init_level++;
 265
 266 failure:
 267         switch (init_level) {
 268         case 4:
 269                 /* Initialized successfully */
 270                 break;
 271         case 3:
 272                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph destroyed\n"));
 273                 xpt_remove_periph(periph);
 274                 /* FALLTHROUGH */
 275         case 2:
 276                 xpt_lock_buses();
 277                 TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links);
 278                 xpt_unlock_buses();
 279                 xpt_free_path(periph->path);
 280                 /* FALLTHROUGH */
 281         case 1:
 282                 free(periph, M_CAMPERIPH);
 283                 /* FALLTHROUGH */
 284         case 0:
 285                 /* No cleanup to perform. */
 286                 break;
 287         default:
 288                 panic("%s: Unknown init level", __func__);
 289         }
 290         return(status);
 291 }
 292
 293 /*
 294  * Find a peripheral structure with the specified path, target, lun,
 295  * and (optionally) type.  If the name is NULL, this function will return
 296  * the first peripheral driver that matches the specified path.
 297  */
 298 struct cam_periph *
 299 cam_periph_find(struct cam_path *path, char *name)
 300 {
 301         struct periph_driver **p_drv;
 302         struct cam_periph *periph;
 303
 304         xpt_lock_buses();
 305         for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
 306
 307                 if (name != NULL && (strcmp((*p_drv)->driver_name, name) != 0))
 308                         continue;
 309
 310                 TAILQ_FOREACH(periph, &(*p_drv)->units, unit_links) {
 311                         if (xpt_path_comp(periph->path, path) == 0) {
 312                                 xpt_unlock_buses();
 313                                 cam_periph_assert(periph, MA_OWNED);
 314                                 return(periph);
 315                         }
 316                 }
 317                 if (name != NULL) {
 318                         xpt_unlock_buses();
 319                         return(NULL);
 320                 }
 321         }
 322         xpt_unlock_buses();
 323         return(NULL);
 324 }
 325
 326 /*
 327  * Find peripheral driver instances attached to the specified path.
 328  */
 329 int
 330 cam_periph_list(struct cam_path *path, struct sbuf *sb)
 331 {
 332         struct sbuf local_sb;
 333         struct periph_driver **p_drv;
 334         struct cam_periph *periph;
 335         int count;
 336         int sbuf_alloc_len;
 337
 338         sbuf_alloc_len = 16;
 339 retry:
 340         sbuf_new(&local_sb, NULL, sbuf_alloc_len, SBUF_FIXEDLEN);
 341         count = 0;
 342         xpt_lock_buses();
 343         for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
 344
 345                 TAILQ_FOREACH(periph, &(*p_drv)->units, unit_links) {
 346                         if (xpt_path_comp(periph->path, path) != 0)
 347                                 continue;
 348
 349                         if (sbuf_len(&local_sb) != 0)
 350                                 sbuf_cat(&local_sb, ",");
 351
 352                         sbuf_printf(&local_sb, "%s%d", periph->periph_name,
 353                                     periph->unit_number);
 354
 355                         if (sbuf_error(&local_sb) == ENOMEM) {
 356                                 sbuf_alloc_len *= 2;
 357                                 xpt_unlock_buses();
 358                                 sbuf_delete(&local_sb);
 359                                 goto retry;
 360                         }
 361                         count++;
 362                 }
 363         }
 364         xpt_unlock_buses();
 365         sbuf_finish(&local_sb);
 366         sbuf_cpy(sb, sbuf_data(&local_sb));
 367         sbuf_delete(&local_sb);
 368         return (count);
 369 }
 370
 371 cam_status
 372 cam_periph_acquire(struct cam_periph *periph)
 373 {
 374         cam_status status;
 375
 376         status = CAM_REQ_CMP_ERR;
 377         if (periph == NULL)
 378                 return (status);
 379
 380         xpt_lock_buses();
 381         if ((periph->flags & CAM_PERIPH_INVALID) == 0) {
 382                 periph->refcount++;
 383                 status = CAM_REQ_CMP;
 384         }
 385         xpt_unlock_buses();
 386
 387         return (status);
 388 }
 389
 390 void
 391 cam_periph_doacquire(struct cam_periph *periph)
 392 {
 393
 394         xpt_lock_buses();
 395         KASSERT(periph->refcount >= 1,
 396             ("cam_periph_doacquire() with refcount == %d", periph->refcount));
 397         periph->refcount++;
 398         xpt_unlock_buses();
 399 }
 400
 401 void
 402 cam_periph_release_locked_buses(struct cam_periph *periph)
 403 {
 404
 405         cam_periph_assert(periph, MA_OWNED);
 406         KASSERT(periph->refcount >= 1, ("periph->refcount >= 1"));
 407         if (--periph->refcount == 0)
 408                 camperiphfree(periph);
 409 }
 410
 411 void
 412 cam_periph_release_locked(struct cam_periph *periph)
 413 {
 414
 415         if (periph == NULL)
 416                 return;
 417
 418         xpt_lock_buses();
 419         cam_periph_release_locked_buses(periph);
 420         xpt_unlock_buses();
 421 }
 422
 423 void
 424 cam_periph_release(struct cam_periph *periph)
 425 {
 426         struct mtx *mtx;
 427
 428         if (periph == NULL)
 429                 return;
 430
 431         cam_periph_assert(periph, MA_NOTOWNED);
 432         mtx = cam_periph_mtx(periph);
 433         mtx_lock(mtx);
 434         cam_periph_release_locked(periph);
 435         mtx_unlock(mtx);
 436 }
 437
 438 int
 439 cam_periph_hold(struct cam_periph *periph, int priority)
 440 {
 441         int error;
 442
 443         /*
 444          * Increment the reference count on the peripheral
 445          * while we wait for our lock attempt to succeed
 446          * to ensure the peripheral doesn't disappear out
 447          * from user us while we sleep.
 448          */
 449
 450         if (cam_periph_acquire(periph) != CAM_REQ_CMP)
 451                 return (ENXIO);
 452
 453         cam_periph_assert(periph, MA_OWNED);
 454         while ((periph->flags & CAM_PERIPH_LOCKED) != 0) {
 455                 periph->flags |= CAM_PERIPH_LOCK_WANTED;
 456                 if ((error = cam_periph_sleep(periph, periph, priority,
 457                     "caplck", 0)) != 0) {
 458                         cam_periph_release_locked(periph);
 459                         return (error);
 460                 }
 461                 if (periph->flags & CAM_PERIPH_INVALID) {
 462                         cam_periph_release_locked(periph);
 463                         return (ENXIO);
 464                 }
 465         }
 466
 467         periph->flags |= CAM_PERIPH_LOCKED;
 468         return (0);
 469 }
 470
 471 void
 472 cam_periph_unhold(struct cam_periph *periph)
 473 {
 474
 475         cam_periph_assert(periph, MA_OWNED);
 476
 477         periph->flags &= ~CAM_PERIPH_LOCKED;
 478         if ((periph->flags & CAM_PERIPH_LOCK_WANTED) != 0) {
 479                 periph->flags &= ~CAM_PERIPH_LOCK_WANTED;
 480                 wakeup(periph);
 481         }
 482
 483         cam_periph_release_locked(periph);
 484 }
 485
 486 /*
 487  * Look for the next unit number that is not currently in use for this
 488  * peripheral type starting at "newunit".  Also exclude unit numbers that
 489  * are reserved by for future "hardwiring" unless we already know that this
 490  * is a potential wired device.  Only assume that the device is "wired" the
 491  * first time through the loop since after that we'll be looking at unit
 492  * numbers that did not match a wiring entry.
 493  */
 494 static u_int
 495 camperiphnextunit(struct periph_driver *p_drv, u_int newunit, int wired,
 496                   path_id_t pathid, target_id_t target, lun_id_t lun)
 497 {
 498         struct  cam_periph *periph;
 499         char    *periph_name;
 500         int     i, val, dunit, r;
 501         const char *dname, *strval;
 502
 503         periph_name = p_drv->driver_name;
 504         for (;;newunit++) {
 505
 506                 for (periph = TAILQ_FIRST(&p_drv->units);
 507                      periph != NULL && periph->unit_number != newunit;
 508                      periph = TAILQ_NEXT(periph, unit_links))
 509                         ;
 510
 511                 if (periph != NULL && periph->unit_number == newunit) {
 512                         if (wired != 0) {
 513                                 xpt_print(periph->path, "Duplicate Wired "
 514                                     "Device entry!\n");
 515                                 xpt_print(periph->path, "Second device (%s "
 516                                     "device at scbus%d target %d lun %d) will "
 517                                     "not be wired\n", periph_name, pathid,
 518                                     target, lun);
 519                                 wired = 0;
 520                         }
 521                         continue;
 522                 }
 523                 if (wired)
 524                         break;
 525
 526                 /*
 527                  * Don't match entries like "da 4" as a wired down
 528                  * device, but do match entries like "da 4 target 5"
 529                  * or even "da 4 scbus 1".
 530                  */
 531                 i = 0;
 532                 dname = periph_name;
 533                 for (;;) {
 534                         r = resource_find_dev(&i, dname, &dunit, NULL, NULL);
 535                         if (r != 0)
 536                                 break;
 537                         /* if no "target" and no specific scbus, skip */
 538                         if (resource_int_value(dname, dunit, "target", &val) &&
 539                             (resource_string_value(dname, dunit, "at",&strval)||
 540                              strcmp(strval, "scbus") == 0))
 541                                 continue;
 542                         if (newunit == dunit)
 543                                 break;
 544                 }
 545                 if (r != 0)
 546                         break;
 547         }
 548         return (newunit);
 549 }
 550
 551 static u_int
 552 camperiphunit(struct periph_driver *p_drv, path_id_t pathid,
 553               target_id_t target, lun_id_t lun)
 554 {
 555         u_int   unit;
 556         int     wired, i, val, dunit;
 557         const char *dname, *strval;
 558         char    pathbuf[32], *periph_name;
 559
 560         periph_name = p_drv->driver_name;
 561         snprintf(pathbuf, sizeof(pathbuf), "scbus%d", pathid);
 562         unit = 0;
 563         i = 0;
 564         dname = periph_name;
 565         for (wired = 0; resource_find_dev(&i, dname, &dunit, NULL, NULL) == 0;
 566              wired = 0) {
 567                 if (resource_string_value(dname, dunit, "at", &strval) == 0) {
 568                         if (strcmp(strval, pathbuf) != 0)
 569                                 continue;
 570                         wired++;
 571                 }
 572                 if (resource_int_value(dname, dunit, "target", &val) == 0) {
 573                         if (val != target)
 574                                 continue;
 575                         wired++;
 576                 }
 577                 if (resource_int_value(dname, dunit, "lun", &val) == 0) {
 578                         if (val != lun)
 579                                 continue;
 580                         wired++;
 581                 }
 582                 if (wired != 0) {
 583                         unit = dunit;
 584                         break;
 585                 }
 586         }
 587
 588         /*
 589          * Either start from 0 looking for the next unit or from
 590          * the unit number given in the resource config.  This way,
 591          * if we have wildcard matches, we don't return the same
 592          * unit number twice.
 593          */
 594         unit = camperiphnextunit(p_drv, unit, wired, pathid, target, lun);
 595
 596         return (unit);
 597 }
 598
 599 void
 600 cam_periph_invalidate(struct cam_periph *periph)
 601 {
 602
 603         cam_periph_assert(periph, MA_OWNED);
 604         /*
 605          * We only call this routine the first time a peripheral is
 606          * invalidated.
 607          */
 608         if ((periph->flags & CAM_PERIPH_INVALID) != 0)
 609                 return;
 610
 611         CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph invalidated\n"));
 612         if ((periph->flags & CAM_PERIPH_ANNOUNCED) && !rebooting)
 613                 xpt_denounce_periph(periph);
 614         periph->flags |= CAM_PERIPH_INVALID;
 615         periph->flags &= ~CAM_PERIPH_NEW_DEV_FOUND;
 616         if (periph->periph_oninval != NULL)
 617                 periph->periph_oninval(periph);
 618         cam_periph_release_locked(periph);
 619 }
 620
 621 static void
 622 camperiphfree(struct cam_periph *periph)
 623 {
 624         struct periph_driver **p_drv;
 625
 626         cam_periph_assert(periph, MA_OWNED);
 627         KASSERT(periph->periph_allocating == 0, ("%s%d: freed while allocating",
 628             periph->periph_name, periph->unit_number));
 629         for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
 630                 if (strcmp((*p_drv)->driver_name, periph->periph_name) == 0)
 631                         break;
 632         }
 633         if (*p_drv == NULL) {
 634                 printf("camperiphfree: attempt to free non-existant periph\n");
 635                 return;
 636         }
 637
 638         /*
 639          * We need to set this flag before dropping the topology lock, to
 640          * let anyone who is traversing the list that this peripheral is
 641          * about to be freed, and there will be no more reference count
 642          * checks.
 643          */
 644         periph->flags |= CAM_PERIPH_FREE;
 645
 646         /*
 647          * The peripheral destructor semantics dictate calling with only the
 648          * SIM mutex held.  Since it might sleep, it should not be called
 649          * with the topology lock held.
 650          */
 651         xpt_unlock_buses();
 652
 653         /*
 654          * We need to call the peripheral destructor prior to removing the
 655          * peripheral from the list.  Otherwise, we risk running into a
 656          * scenario where the peripheral unit number may get reused
 657          * (because it has been removed from the list), but some resources
 658          * used by the peripheral are still hanging around.  In particular,
 659          * the devfs nodes used by some peripherals like the pass(4) driver
 660          * aren't fully cleaned up until the destructor is run.  If the
 661          * unit number is reused before the devfs instance is fully gone,
 662          * devfs will panic.
 663          */
 664         if (periph->periph_dtor != NULL)
 665                 periph->periph_dtor(periph);
 666
 667         /*
 668          * The peripheral list is protected by the topology lock.
 669          */
 670         xpt_lock_buses();
 671
 672         TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links);
 673         (*p_drv)->generation++;
 674
 675         xpt_remove_periph(periph);
 676
 677         xpt_unlock_buses();
 678         if ((periph->flags & CAM_PERIPH_ANNOUNCED) && !rebooting)
 679                 xpt_print(periph->path, "Periph destroyed\n");
 680         else
 681                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph destroyed\n"));
 682
 683         if (periph->flags & CAM_PERIPH_NEW_DEV_FOUND) {
 684                 union ccb ccb;
 685                 void *arg;
 686
 687                 switch (periph->deferred_ac) {
 688                 case AC_FOUND_DEVICE:
 689                         ccb.ccb_h.func_code = XPT_GDEV_TYPE;
 690                         xpt_setup_ccb(&ccb.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 691                         xpt_action(&ccb);
 692                         arg = &ccb;
 693                         break;
 694                 case AC_PATH_REGISTERED:
 695                         ccb.ccb_h.func_code = XPT_PATH_INQ;
 696                         xpt_setup_ccb(&ccb.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 697                         xpt_action(&ccb);
 698                         arg = &ccb;
 699                         break;
 700                 default:
 701                         arg = NULL;
 702                         break;
 703                 }
 704                 periph->deferred_callback(NULL, periph->deferred_ac,
 705                                           periph->path, arg);
 706         }
 707         xpt_free_path(periph->path);
 708         free(periph, M_CAMPERIPH);
 709         xpt_lock_buses();
 710 }
 711
 712 /*
 713  * Map user virtual pointers into kernel virtual address space, so we can
 714  * access the memory.  This is now a generic function that centralizes most
 715  * of the sanity checks on the data flags, if any.
 716  * This also only works for up to MAXPHYS memory.  Since we use
 717  * buffers to map stuff in and out, we're limited to the buffer size.
 718  */
 719 int
 720 cam_periph_mapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo,
 721     u_int maxmap)
 722 {
 723         int numbufs, i, j;
 724         int flags[CAM_PERIPH_MAXMAPS];
 725         u_int8_t **data_ptrs[CAM_PERIPH_MAXMAPS];
 726         u_int32_t lengths[CAM_PERIPH_MAXMAPS];
 727         u_int32_t dirs[CAM_PERIPH_MAXMAPS];
 728
 729         if (maxmap == 0)
 730                 maxmap = DFLTPHYS;      /* traditional default */
 731         else if (maxmap > MAXPHYS)
 732                 maxmap = MAXPHYS;       /* for safety */
 733         switch(ccb->ccb_h.func_code) {
 734         case XPT_DEV_MATCH:
 735                 if (ccb->cdm.match_buf_len == 0) {
 736                         printf("cam_periph_mapmem: invalid match buffer "
 737                                "length 0\n");
 738                         return(EINVAL);
 739                 }
 740                 if (ccb->cdm.pattern_buf_len > 0) {
 741                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.patterns;
 742                         lengths[0] = ccb->cdm.pattern_buf_len;
 743                         dirs[0] = CAM_DIR_OUT;
 744                         data_ptrs[1] = (u_int8_t **)&ccb->cdm.matches;
 745                         lengths[1] = ccb->cdm.match_buf_len;
 746                         dirs[1] = CAM_DIR_IN;
 747                         numbufs = 2;
 748                 } else {
 749                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.matches;
 750                         lengths[0] = ccb->cdm.match_buf_len;
 751                         dirs[0] = CAM_DIR_IN;
 752                         numbufs = 1;
 753                 }
 754                 /*
 755                  * This request will not go to the hardware, no reason
 756                  * to be so strict. vmapbuf() is able to map up to MAXPHYS.
 757                  */
 758                 maxmap = MAXPHYS;
 759                 break;
 760         case XPT_SCSI_IO:
 761         case XPT_CONT_TARGET_IO:
 762                 if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_NONE)
 763                         return(0);
 764                 if ((ccb->ccb_h.flags & CAM_DATA_MASK) != CAM_DATA_VADDR)
 765                         return (EINVAL);
 766                 data_ptrs[0] = &ccb->csio.data_ptr;
 767                 lengths[0] = ccb->csio.dxfer_len;
 768                 dirs[0] = ccb->ccb_h.flags & CAM_DIR_MASK;
 769                 numbufs = 1;
 770                 break;
 771         case XPT_ATA_IO:
 772                 if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_NONE)
 773                         return(0);
 774                 if ((ccb->ccb_h.flags & CAM_DATA_MASK) != CAM_DATA_VADDR)
 775                         return (EINVAL);
 776                 data_ptrs[0] = &ccb->ataio.data_ptr;
 777                 lengths[0] = ccb->ataio.dxfer_len;
 778                 dirs[0] = ccb->ccb_h.flags & CAM_DIR_MASK;
 779                 numbufs = 1;
 780                 break;
 781         case XPT_SMP_IO:
 782                 data_ptrs[0] = &ccb->smpio.smp_request;
 783                 lengths[0] = ccb->smpio.smp_request_len;
 784                 dirs[0] = CAM_DIR_OUT;
 785                 data_ptrs[1] = &ccb->smpio.smp_response;
 786                 lengths[1] = ccb->smpio.smp_response_len;
 787                 dirs[1] = CAM_DIR_IN;
 788                 numbufs = 2;
 789                 break;
 790         case XPT_DEV_ADVINFO:
 791                 if (ccb->cdai.bufsiz == 0)
 792                         return (0);
 793
 794                 data_ptrs[0] = (uint8_t **)&ccb->cdai.buf;
 795                 lengths[0] = ccb->cdai.bufsiz;
 796                 dirs[0] = CAM_DIR_IN;
 797                 numbufs = 1;
 798
 799                 /*
 800                  * This request will not go to the hardware, no reason
 801                  * to be so strict. vmapbuf() is able to map up to MAXPHYS.
 802                  */
 803                 maxmap = MAXPHYS;
 804                 break;
 805         default:
 806                 return(EINVAL);
 807                 break; /* NOTREACHED */
 808         }
 809
 810         /*
 811          * Check the transfer length and permissions first, so we don't
 812          * have to unmap any previously mapped buffers.
 813          */
 814         for (i = 0; i < numbufs; i++) {
 815
 816                 flags[i] = 0;
 817
 818                 /*
 819                  * The userland data pointer passed in may not be page
 820                  * aligned.  vmapbuf() truncates the address to a page
 821                  * boundary, so if the address isn't page aligned, we'll
 822                  * need enough space for the given transfer length, plus
 823                  * whatever extra space is necessary to make it to the page
 824                  * boundary.
 825                  */
 826                 if ((lengths[i] +
 827                     (((vm_offset_t)(*data_ptrs[i])) & PAGE_MASK)) > maxmap){
 828                         printf("cam_periph_mapmem: attempt to map %lu bytes, "
 829                                "which is greater than %lu\n",
 830                                (long)(lengths[i] +
 831                                (((vm_offset_t)(*data_ptrs[i])) & PAGE_MASK)),
 832                                (u_long)maxmap);
 833                         return(E2BIG);
 834                 }
 835
 836                 if (dirs[i] & CAM_DIR_OUT) {
 837                         flags[i] = BIO_WRITE;
 838                 }
 839
 840                 if (dirs[i] & CAM_DIR_IN) {
 841                         flags[i] = BIO_READ;
 842                 }
 843
 844         }
 845
 846         /*
 847          * This keeps the kernel stack of current thread from getting
 848          * swapped.  In low-memory situations where the kernel stack might
 849          * otherwise get swapped out, this holds it and allows the thread
 850          * to make progress and release the kernel mapped pages sooner.
 851          *
 852          * XXX KDM should I use P_NOSWAP instead?
 853          */
 854         PHOLD(curproc);
 855
 856         for (i = 0; i < numbufs; i++) {
 857                 /*
 858                  * Get the buffer.
 859                  */
 860                 mapinfo->bp[i] = getpbuf(NULL);
 861
 862                 /* put our pointer in the data slot */
 863                 mapinfo->bp[i]->b_data = *data_ptrs[i];
 864
 865                 /* save the user's data address */
 866                 mapinfo->bp[i]->b_caller1 = *data_ptrs[i];
 867
 868                 /* set the transfer length, we know it's < MAXPHYS */
 869                 mapinfo->bp[i]->b_bufsize = lengths[i];
 870
 871                 /* set the direction */
 872                 mapinfo->bp[i]->b_iocmd = flags[i];
 873
 874                 /*
 875                  * Map the buffer into kernel memory.
 876                  *
 877                  * Note that useracc() alone is not a  sufficient test.
 878                  * vmapbuf() can still fail due to a smaller file mapped
 879                  * into a larger area of VM, or if userland races against
 880                  * vmapbuf() after the useracc() check.
 881                  */
 882                 if (vmapbuf(mapinfo->bp[i], 1) < 0) {
 883                         for (j = 0; j < i; ++j) {
 884                                 *data_ptrs[j] = mapinfo->bp[j]->b_caller1;
 885                                 vunmapbuf(mapinfo->bp[j]);
 886                                 relpbuf(mapinfo->bp[j], NULL);
 887                         }
 888                         relpbuf(mapinfo->bp[i], NULL);
 889                         PRELE(curproc);
 890                         return(EACCES);
 891                 }
 892
 893                 /* set our pointer to the new mapped area */
 894                 *data_ptrs[i] = mapinfo->bp[i]->b_data;
 895
 896                 mapinfo->num_bufs_used++;
 897         }
 898
 899         /*
 900          * Now that we've gotten this far, change ownership to the kernel
 901          * of the buffers so that we don't run afoul of returning to user
 902          * space with locks (on the buffer) held.
 903          */
 904         for (i = 0; i < numbufs; i++) {
 905                 BUF_KERNPROC(mapinfo->bp[i]);
 906         }
 907
 908
 909         return(0);
 910 }
 911
 912 /*
 913  * Unmap memory segments mapped into kernel virtual address space by
 914  * cam_periph_mapmem().
 915  */
 916 void
 917 cam_periph_unmapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo)
 918 {
 919         int numbufs, i;
 920         u_int8_t **data_ptrs[CAM_PERIPH_MAXMAPS];
 921
 922         if (mapinfo->num_bufs_used <= 0) {
 923                 /* nothing to free and the process wasn't held. */
 924                 return;
 925         }
 926
 927         switch (ccb->ccb_h.func_code) {
 928         case XPT_DEV_MATCH:
 929                 numbufs = min(mapinfo->num_bufs_used, 2);
 930
 931                 if (numbufs == 1) {
 932                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.matches;
 933                 } else {
 934                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.patterns;
 935                         data_ptrs[1] = (u_int8_t **)&ccb->cdm.matches;
 936                 }
 937                 break;
 938         case XPT_SCSI_IO:
 939         case XPT_CONT_TARGET_IO:
 940                 data_ptrs[0] = &ccb->csio.data_ptr;
 941                 numbufs = min(mapinfo->num_bufs_used, 1);
 942                 break;
 943         case XPT_ATA_IO:
 944                 data_ptrs[0] = &ccb->ataio.data_ptr;
 945                 numbufs = min(mapinfo->num_bufs_used, 1);
 946                 break;
 947         case XPT_SMP_IO:
 948                 numbufs = min(mapinfo->num_bufs_used, 2);
 949                 data_ptrs[0] = &ccb->smpio.smp_request;
 950                 data_ptrs[1] = &ccb->smpio.smp_response;
 951                 break;
 952         case XPT_DEV_ADVINFO:
 953                 numbufs = min(mapinfo->num_bufs_used, 1);
 954                 data_ptrs[0] = (uint8_t **)&ccb->cdai.buf;
 955                 break;
 956         default:
 957                 /* allow ourselves to be swapped once again */
 958                 PRELE(curproc);
 959                 return;
 960                 break; /* NOTREACHED */
 961         }
 962
 963         for (i = 0; i < numbufs; i++) {
 964                 /* Set the user's pointer back to the original value */
 965                 *data_ptrs[i] = mapinfo->bp[i]->b_caller1;
 966
 967                 /* unmap the buffer */
 968                 vunmapbuf(mapinfo->bp[i]);
 969
 970                 /* release the buffer */
 971                 relpbuf(mapinfo->bp[i], NULL);
 972         }
 973
 974         /* allow ourselves to be swapped once again */
 975         PRELE(curproc);
 976 }
 977
 978 int
 979 cam_periph_ioctl(struct cam_periph *periph, u_long cmd, caddr_t addr,
 980                  int (*error_routine)(union ccb *ccb,
 981                                       cam_flags camflags,
 982                                       u_int32_t sense_flags))
 983 {
 984         union ccb            *ccb;
 985         int                  error;
 986         int                  found;
 987
 988         error = found = 0;
 989
 990         switch(cmd){
 991         case CAMGETPASSTHRU:
 992                 ccb = cam_periph_getccb(periph, CAM_PRIORITY_NORMAL);
 993                 xpt_setup_ccb(&ccb->ccb_h,
 994                               ccb->ccb_h.path,
 995                               CAM_PRIORITY_NORMAL);
 996                 ccb->ccb_h.func_code = XPT_GDEVLIST;
 997
 998                 /*
 999                  * Basically, the point of this is that we go through
1000                  * getting the list of devices, until we find a passthrough
1001                  * device.  In the current version of the CAM code, the
1002                  * only way to determine what type of device we're dealing
1003                  * with is by its name.
1004                  */
1005                 while (found == 0) {
1006                         ccb->cgdl.index = 0;
1007                         ccb->cgdl.status = CAM_GDEVLIST_MORE_DEVS;
1008                         while (ccb->cgdl.status == CAM_GDEVLIST_MORE_DEVS) {
1009
1010                                 /* we want the next device in the list */
1011                                 xpt_action(ccb);
1012                                 if (strncmp(ccb->cgdl.periph_name,
1013                                     "pass", 4) == 0){
1014                                         found = 1;
1015                                         break;
1016                                 }
1017                         }
1018                         if ((ccb->cgdl.status == CAM_GDEVLIST_LAST_DEVICE) &&
1019                             (found == 0)) {
1020                                 ccb->cgdl.periph_name[0] = '\0';
1021                                 ccb->cgdl.unit_number = 0;
1022                                 break;
1023                         }
1024                 }
1025
1026                 /* copy the result back out */
1027                 bcopy(ccb, addr, sizeof(union ccb));
1028
1029                 /* and release the ccb */
1030                 xpt_release_ccb(ccb);
1031
1032                 break;
1033         default:
1034                 error = ENOTTY;
1035                 break;
1036         }
1037         return(error);
1038 }
1039
1040 static void
1041 cam_periph_done_panic(struct cam_periph *periph, union ccb *done_ccb)
1042 {
1043
1044         panic("%s: already done with ccb %p", __func__, done_ccb);
1045 }
1046
1047 static void
1048 cam_periph_done(struct cam_periph *periph, union ccb *done_ccb)
1049 {
1050
1051         /* Caller will release the CCB */
1052         xpt_path_assert(done_ccb->ccb_h.path, MA_OWNED);
1053         done_ccb->ccb_h.cbfcnp = cam_periph_done_panic;
1054         wakeup(&done_ccb->ccb_h.cbfcnp);
1055 }
1056
1057 static void
1058 cam_periph_ccbwait(union ccb *ccb)
1059 {
1060
1061         if ((ccb->ccb_h.func_code & XPT_FC_QUEUED) != 0) {
1062                 while (ccb->ccb_h.cbfcnp != cam_periph_done_panic)
1063                         xpt_path_sleep(ccb->ccb_h.path, &ccb->ccb_h.cbfcnp,
1064                             PRIBIO, "cbwait", 0);
1065         }
1066         KASSERT(ccb->ccb_h.pinfo.index == CAM_UNQUEUED_INDEX &&
1067             (ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_INPROG,
1068             ("%s: proceeding with incomplete ccb: ccb=%p, func_code=%#x, "
1069              "status=%#x, index=%d", __func__, ccb, ccb->ccb_h.func_code,
1070              ccb->ccb_h.status, ccb->ccb_h.pinfo.index));
1071 }
1072
1073 int
1074 cam_periph_runccb(union ccb *ccb,
1075                   int (*error_routine)(union ccb *ccb,
1076                                        cam_flags camflags,
1077                                        u_int32_t sense_flags),
1078                   cam_flags camflags, u_int32_t sense_flags,
1079                   struct devstat *ds)
1080 {
1081         struct bintime *starttime;
1082         struct bintime ltime;
1083         int error;
1084
1085         starttime = NULL;
1086         xpt_path_assert(ccb->ccb_h.path, MA_OWNED);
1087         KASSERT((ccb->ccb_h.flags & CAM_UNLOCKED) == 0,
1088             ("%s: ccb=%p, func_code=%#x, flags=%#x", __func__, ccb,
1089              ccb->ccb_h.func_code, ccb->ccb_h.flags));
1090
1091         /*
1092          * If the user has supplied a stats structure, and if we understand
1093          * this particular type of ccb, record the transaction start.
1094          */
1095         if ((ds != NULL) && (ccb->ccb_h.func_code == XPT_SCSI_IO ||
1096             ccb->ccb_h.func_code == XPT_ATA_IO)) {
1097                 starttime = &ltime;
1098                 binuptime(starttime);
1099                 devstat_start_transaction(ds, starttime);
1100         }
1101
1102         ccb->ccb_h.cbfcnp = cam_periph_done;
1103         xpt_action(ccb);
1104
1105         do {
1106                 cam_periph_ccbwait(ccb);
1107                 if ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP)
1108                         error = 0;
1109                 else if (error_routine != NULL) {
1110                         ccb->ccb_h.cbfcnp = cam_periph_done;
1111                         error = (*error_routine)(ccb, camflags, sense_flags);
1112                 } else
1113                         error = 0;
1114
1115         } while (error == ERESTART);
1116
1117         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) {
1118                 cam_release_devq(ccb->ccb_h.path,
1119                                  /* relsim_flags */0,
1120                                  /* openings */0,
1121                                  /* timeout */0,
1122                                  /* getcount_only */ FALSE);
1123                 ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
1124         }
1125
1126         if (ds != NULL) {
1127                 if (ccb->ccb_h.func_code == XPT_SCSI_IO) {
1128                         devstat_end_transaction(ds,
1129                                         ccb->csio.dxfer_len - ccb->csio.resid,
1130                                         ccb->csio.tag_action & 0x3,
1131                                         ((ccb->ccb_h.flags & CAM_DIR_MASK) ==
1132                                         CAM_DIR_NONE) ?  DEVSTAT_NO_DATA :
1133                                         (ccb->ccb_h.flags & CAM_DIR_OUT) ?
1134                                         DEVSTAT_WRITE :
1135                                         DEVSTAT_READ, NULL, starttime);
1136                 } else if (ccb->ccb_h.func_code == XPT_ATA_IO) {
1137                         devstat_end_transaction(ds,
1138                                         ccb->ataio.dxfer_len - ccb->ataio.resid,
1139                                         0, /* Not used in ATA */
1140                                         ((ccb->ccb_h.flags & CAM_DIR_MASK) ==
1141                                         CAM_DIR_NONE) ?  DEVSTAT_NO_DATA :
1142                                         (ccb->ccb_h.flags & CAM_DIR_OUT) ?
1143                                         DEVSTAT_WRITE :
1144                                         DEVSTAT_READ, NULL, starttime);
1145                 }
1146         }
1147
1148         return(error);
1149 }
1150
1151 void
1152 cam_freeze_devq(struct cam_path *path)
1153 {
1154         struct ccb_hdr ccb_h;
1155
1156         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("cam_freeze_devq\n"));
1157         xpt_setup_ccb(&ccb_h, path, /*priority*/1);
1158         ccb_h.func_code = XPT_NOOP;
1159         ccb_h.flags = CAM_DEV_QFREEZE;
1160         xpt_action((union ccb *)&ccb_h);
1161 }
1162
1163 u_int32_t
1164 cam_release_devq(struct cam_path *path, u_int32_t relsim_flags,
1165                  u_int32_t openings, u_int32_t arg,
1166                  int getcount_only)
1167 {
1168         struct ccb_relsim crs;
1169
1170         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("cam_release_devq(%u, %u, %u, %d)\n",
1171             relsim_flags, openings, arg, getcount_only));
1172         xpt_setup_ccb(&crs.ccb_h, path, CAM_PRIORITY_NORMAL);
1173         crs.ccb_h.func_code = XPT_REL_SIMQ;
1174         crs.ccb_h.flags = getcount_only ? CAM_DEV_QFREEZE : 0;
1175         crs.release_flags = relsim_flags;
1176         crs.openings = openings;
1177         crs.release_timeout = arg;
1178         xpt_action((union ccb *)&crs);
1179         return (crs.qfrozen_cnt);
1180 }
1181
1182 #define saved_ccb_ptr ppriv_ptr0
1183 static void
1184 camperiphdone(struct cam_periph *periph, union ccb *done_ccb)
1185 {
1186         union ccb      *saved_ccb;
1187         cam_status      status;
1188         struct scsi_start_stop_unit *scsi_cmd;
1189         int    error_code, sense_key, asc, ascq;
1190
1191         scsi_cmd = (struct scsi_start_stop_unit *)
1192             &done_ccb->csio.cdb_io.cdb_bytes;
1193         status = done_ccb->ccb_h.status;
1194
1195         if ((status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
1196                 if (scsi_extract_sense_ccb(done_ccb,
1197                     &error_code, &sense_key, &asc, &ascq)) {
1198                         /*
1199                          * If the error is "invalid field in CDB",
1200                          * and the load/eject flag is set, turn the
1201                          * flag off and try again.  This is just in
1202                          * case the drive in question barfs on the
1203                          * load eject flag.  The CAM code should set
1204                          * the load/eject flag by default for
1205                          * removable media.
1206                          */
1207                         if ((scsi_cmd->opcode == START_STOP_UNIT) &&
1208                             ((scsi_cmd->how & SSS_LOEJ) != 0) &&
1209                              (asc == 0x24) && (ascq == 0x00)) {
1210                                 scsi_cmd->how &= ~SSS_LOEJ;
1211                                 if (status & CAM_DEV_QFRZN) {
1212                                         cam_release_devq(done_ccb->ccb_h.path,
1213                                             0, 0, 0, 0);
1214                                         done_ccb->ccb_h.status &=
1215                                             ~CAM_DEV_QFRZN;
1216                                 }
1217                                 xpt_action(done_ccb);
1218                                 goto out;
1219                         }
1220                 }
1221                 if (cam_periph_error(done_ccb,
1222                     0, SF_RETRY_UA | SF_NO_PRINT, NULL) == ERESTART)
1223                         goto out;
1224                 if (done_ccb->ccb_h.status & CAM_DEV_QFRZN) {
1225                         cam_release_devq(done_ccb->ccb_h.path, 0, 0, 0, 0);
1226                         done_ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
1227                 }
1228         } else {
1229                 /*
1230                  * If we have successfully taken a device from the not
1231                  * ready to ready state, re-scan the device and re-get
1232                  * the inquiry information.  Many devices (mostly disks)
1233                  * don't properly report their inquiry information unless
1234                  * they are spun up.
1235                  */
1236                 if (scsi_cmd->opcode == START_STOP_UNIT)
1237                         xpt_async(AC_INQ_CHANGED, done_ccb->ccb_h.path, NULL);
1238         }
1239
1240         /*
1241          * Perform the final retry with the original CCB so that final
1242          * error processing is performed by the owner of the CCB.
1243          */
1244         saved_ccb = (union ccb *)done_ccb->ccb_h.saved_ccb_ptr;
1245         bcopy(saved_ccb, done_ccb, sizeof(*done_ccb));
1246         xpt_free_ccb(saved_ccb);
1247         if (done_ccb->ccb_h.cbfcnp != camperiphdone)
1248                 periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG;
1249         xpt_action(done_ccb);
1250
1251 out:
1252         /* Drop freeze taken due to CAM_DEV_QFREEZE flag set. */
1253         cam_release_devq(done_ccb->ccb_h.path, 0, 0, 0, 0);
1254 }
1255
1256 /*
1257  * Generic Async Event handler.  Peripheral drivers usually
1258  * filter out the events that require personal attention,
1259  * and leave the rest to this function.
1260  */
1261 void
1262 cam_periph_async(struct cam_periph *periph, u_int32_t code,
1263                  struct cam_path *path, void *arg)
1264 {
1265         switch (code) {
1266         case AC_LOST_DEVICE:
1267                 cam_periph_invalidate(periph);
1268                 break;
1269         default:
1270                 break;
1271         }
1272 }
1273
1274 void
1275 cam_periph_bus_settle(struct cam_periph *periph, u_int bus_settle)
1276 {
1277         struct ccb_getdevstats cgds;
1278
1279         xpt_setup_ccb(&cgds.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
1280         cgds.ccb_h.func_code = XPT_GDEV_STATS;
1281         xpt_action((union ccb *)&cgds);
1282         cam_periph_freeze_after_event(periph, &cgds.last_reset, bus_settle);
1283 }
1284
1285 void
1286 cam_periph_freeze_after_event(struct cam_periph *periph,
1287                               struct timeval* event_time, u_int duration_ms)
1288 {
1289         struct timeval delta;
1290         struct timeval duration_tv;
1291
1292         if (!timevalisset(event_time))
1293                 return;
1294
1295         microtime(&delta);
1296         timevalsub(&delta, event_time);
1297         duration_tv.tv_sec = duration_ms / 1000;
1298         duration_tv.tv_usec = (duration_ms % 1000) * 1000;
1299         if (timevalcmp(&delta, &duration_tv, <)) {
1300                 timevalsub(&duration_tv, &delta);
1301
1302                 duration_ms = duration_tv.tv_sec * 1000;
1303                 duration_ms += duration_tv.tv_usec / 1000;
1304                 cam_freeze_devq(periph->path);
1305                 cam_release_devq(periph->path,
1306                                 RELSIM_RELEASE_AFTER_TIMEOUT,
1307                                 /*reduction*/0,
1308                                 /*timeout*/duration_ms,
1309                                 /*getcount_only*/0);
1310         }
1311
1312 }
1313
1314 static int
1315 camperiphscsistatuserror(union ccb *ccb, union ccb **orig_ccb,
1316     cam_flags camflags, u_int32_t sense_flags,
1317     int *openings, u_int32_t *relsim_flags,
1318     u_int32_t *timeout, u_int32_t *action, const char **action_string)
1319 {
1320         int error;
1321
1322         switch (ccb->csio.scsi_status) {
1323         case SCSI_STATUS_OK:
1324         case SCSI_STATUS_COND_MET:
1325         case SCSI_STATUS_INTERMED:
1326         case SCSI_STATUS_INTERMED_COND_MET:
1327                 error = 0;
1328                 break;
1329         case SCSI_STATUS_CMD_TERMINATED:
1330         case SCSI_STATUS_CHECK_COND:
1331                 error = camperiphscsisenseerror(ccb, orig_ccb,
1332                                                 camflags,
1333                                                 sense_flags,
1334                                                 openings,
1335                                                 relsim_flags,
1336                                                 timeout,
1337                                                 action,
1338                                                 action_string);
1339                 break;
1340         case SCSI_STATUS_QUEUE_FULL:
1341         {
1342                 /* no decrement */
1343                 struct ccb_getdevstats cgds;
1344
1345                 /*
1346                  * First off, find out what the current
1347                  * transaction counts are.
1348                  */
1349                 xpt_setup_ccb(&cgds.ccb_h,
1350                               ccb->ccb_h.path,
1351                               CAM_PRIORITY_NORMAL);
1352                 cgds.ccb_h.func_code = XPT_GDEV_STATS;
1353                 xpt_action((union ccb *)&cgds);
1354
1355                 /*
1356                  * If we were the only transaction active, treat
1357                  * the QUEUE FULL as if it were a BUSY condition.
1358                  */
1359                 if (cgds.dev_active != 0) {
1360                         int total_openings;
1361
1362                         /*
1363                          * Reduce the number of openings to
1364                          * be 1 less than the amount it took
1365                          * to get a queue full bounded by the
1366                          * minimum allowed tag count for this
1367                          * device.
1368                          */
1369                         total_openings = cgds.dev_active + cgds.dev_openings;
1370                         *openings = cgds.dev_active;
1371                         if (*openings < cgds.mintags)
1372                                 *openings = cgds.mintags;
1373                         if (*openings < total_openings)
1374                                 *relsim_flags = RELSIM_ADJUST_OPENINGS;
1375                         else {
1376                                 /*
1377                                  * Some devices report queue full for
1378                                  * temporary resource shortages.  For
1379                                  * this reason, we allow a minimum
1380                                  * tag count to be entered via a
1381                                  * quirk entry to prevent the queue
1382                                  * count on these devices from falling
1383                                  * to a pessimisticly low value.  We
1384                                  * still wait for the next successful
1385                                  * completion, however, before queueing
1386                                  * more transactions to the device.
1387                                  */
1388                                 *relsim_flags = RELSIM_RELEASE_AFTER_CMDCMPLT;
1389                         }
1390                         *timeout = 0;
1391                         error = ERESTART;
1392                         *action &= ~SSQ_PRINT_SENSE;
1393                         break;
1394                 }
1395                 /* FALLTHROUGH */
1396         }
1397         case SCSI_STATUS_BUSY:
1398                 /*
1399                  * Restart the queue after either another
1400                  * command completes or a 1 second timeout.
1401                  */
1402                 if ((sense_flags & SF_RETRY_BUSY) != 0 ||
1403                     (ccb->ccb_h.retry_count--) > 0) {
1404                         error = ERESTART;
1405                         *relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT
1406                                       | RELSIM_RELEASE_AFTER_CMDCMPLT;
1407                         *timeout = 1000;
1408                 } else {
1409                         error = EIO;
1410                 }
1411                 break;
1412         case SCSI_STATUS_RESERV_CONFLICT:
1413         default:
1414                 error = EIO;
1415                 break;
1416         }
1417         return (error);
1418 }
1419
1420 static int
1421 camperiphscsisenseerror(union ccb *ccb, union ccb **orig,
1422     cam_flags camflags, u_int32_t sense_flags,
1423     int *openings, u_int32_t *relsim_flags,
1424     u_int32_t *timeout, u_int32_t *action, const char **action_string)
1425 {
1426         struct cam_periph *periph;
1427         union ccb *orig_ccb = ccb;
1428         int error, recoveryccb;
1429
1430 #if defined(BUF_TRACKING) || defined(FULL_BUF_TRACKING)
1431         if (ccb->ccb_h.func_code == XPT_SCSI_IO && ccb->csio.bio != NULL)
1432                 biotrack(ccb->csio.bio, __func__);
1433 #endif
1434
1435         periph = xpt_path_periph(ccb->ccb_h.path);
1436         recoveryccb = (ccb->ccb_h.cbfcnp == camperiphdone);
1437         if ((periph->flags & CAM_PERIPH_RECOVERY_INPROG) && !recoveryccb) {
1438                 /*
1439                  * If error recovery is already in progress, don't attempt
1440                  * to process this error, but requeue it unconditionally
1441                  * and attempt to process it once error recovery has
1442                  * completed.  This failed command is probably related to
1443                  * the error that caused the currently active error recovery
1444                  * action so our  current recovery efforts should also
1445                  * address this command.  Be aware that the error recovery
1446                  * code assumes that only one recovery action is in progress
1447                  * on a particular peripheral instance at any given time
1448                  * (e.g. only one saved CCB for error recovery) so it is
1449                  * imperitive that we don't violate this assumption.
1450                  */
1451                 error = ERESTART;
1452                 *action &= ~SSQ_PRINT_SENSE;
1453         } else {
1454                 scsi_sense_action err_action;
1455                 struct ccb_getdev cgd;
1456
1457                 /*
1458                  * Grab the inquiry data for this device.
1459                  */
1460                 xpt_setup_ccb(&cgd.ccb_h, ccb->ccb_h.path, CAM_PRIORITY_NORMAL);
1461                 cgd.ccb_h.func_code = XPT_GDEV_TYPE;
1462                 xpt_action((union ccb *)&cgd);
1463
1464                 err_action = scsi_error_action(&ccb->csio, &cgd.inq_data,
1465                     sense_flags);
1466                 error = err_action & SS_ERRMASK;
1467
1468                 /*
1469                  * Do not autostart sequential access devices
1470                  * to avoid unexpected tape loading.
1471                  */
1472                 if ((err_action & SS_MASK) == SS_START &&
1473                     SID_TYPE(&cgd.inq_data) == T_SEQUENTIAL) {
1474                         *action_string = "Will not autostart a "
1475                             "sequential access device";
1476                         goto sense_error_done;
1477                 }
1478
1479                 /*
1480                  * Avoid recovery recursion if recovery action is the same.
1481                  */
1482                 if ((err_action & SS_MASK) >= SS_START && recoveryccb) {
1483                         if (((err_action & SS_MASK) == SS_START &&
1484                              ccb->csio.cdb_io.cdb_bytes[0] == START_STOP_UNIT) ||
1485                             ((err_action & SS_MASK) == SS_TUR &&
1486                              (ccb->csio.cdb_io.cdb_bytes[0] == TEST_UNIT_READY))) {
1487                                 err_action = SS_RETRY|SSQ_DECREMENT_COUNT|EIO;
1488                                 *relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
1489                                 *timeout = 500;
1490                         }
1491                 }
1492
1493                 /*
1494                  * If the recovery action will consume a retry,
1495                  * make sure we actually have retries available.
1496                  */
1497                 if ((err_action & SSQ_DECREMENT_COUNT) != 0) {
1498                         if (ccb->ccb_h.retry_count > 0 &&
1499                             (periph->flags & CAM_PERIPH_INVALID) == 0)
1500                                 ccb->ccb_h.retry_count--;
1501                         else {
1502                                 *action_string = "Retries exhausted";
1503                                 goto sense_error_done;
1504                         }
1505                 }
1506
1507                 if ((err_action & SS_MASK) >= SS_START) {
1508                         /*
1509                          * Do common portions of commands that
1510                          * use recovery CCBs.
1511                          */
1512                         orig_ccb = xpt_alloc_ccb_nowait();
1513                         if (orig_ccb == NULL) {
1514                                 *action_string = "Can't allocate recovery CCB";
1515                                 goto sense_error_done;
1516                         }
1517                         /*
1518                          * Clear freeze flag for original request here, as
1519                          * this freeze will be dropped as part of ERESTART.
1520                          */
1521                         ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
1522                         bcopy(ccb, orig_ccb, sizeof(*orig_ccb));
1523                 }
1524
1525                 switch (err_action & SS_MASK) {
1526                 case SS_NOP:
1527                         *action_string = "No recovery action needed";
1528                         error = 0;
1529                         break;
1530                 case SS_RETRY:
1531                         *action_string = "Retrying command (per sense data)";
1532                         error = ERESTART;
1533                         break;
1534                 case SS_FAIL:
1535                         *action_string = "Unretryable error";
1536                         break;
1537                 case SS_START:
1538                 {
1539                         int le;
1540
1541                         /*
1542                          * Send a start unit command to the device, and
1543                          * then retry the command.
1544                          */
1545                         *action_string = "Attempting to start unit";
1546                         periph->flags |= CAM_PERIPH_RECOVERY_INPROG;
1547
1548                         /*
1549                          * Check for removable media and set
1550                          * load/eject flag appropriately.
1551                          */
1552                         if (SID_IS_REMOVABLE(&cgd.inq_data))
1553                                 le = TRUE;
1554                         else
1555                                 le = FALSE;
1556
1557                         scsi_start_stop(&ccb->csio,
1558                                         /*retries*/1,
1559                                         camperiphdone,
1560                                         MSG_SIMPLE_Q_TAG,
1561                                         /*start*/TRUE,
1562                                         /*load/eject*/le,
1563                                         /*immediate*/FALSE,
1564                                         SSD_FULL_SIZE,
1565                                         /*timeout*/50000);
1566                         break;
1567                 }
1568                 case SS_TUR:
1569                 {
1570                         /*
1571                          * Send a Test Unit Ready to the device.
1572                          * If the 'many' flag is set, we send 120
1573                          * test unit ready commands, one every half
1574                          * second.  Otherwise, we just send one TUR.
1575                          * We only want to do this if the retry
1576                          * count has not been exhausted.
1577                          */
1578                         int retries;
1579
1580                         if ((err_action & SSQ_MANY) != 0) {
1581                                 *action_string = "Polling device for readiness";
1582                                 retries = 120;
1583                         } else {
1584                                 *action_string = "Testing device for readiness";
1585                                 retries = 1;
1586                         }
1587                         periph->flags |= CAM_PERIPH_RECOVERY_INPROG;
1588                         scsi_test_unit_ready(&ccb->csio,
1589                                              retries,
1590                                              camperiphdone,
1591                                              MSG_SIMPLE_Q_TAG,
1592                                              SSD_FULL_SIZE,
1593                                              /*timeout*/5000);
1594
1595                         /*
1596                          * Accomplish our 500ms delay by deferring
1597                          * the release of our device queue appropriately.
1598                          */
1599                         *relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
1600                         *timeout = 500;
1601                         break;
1602                 }
1603                 default:
1604                         panic("Unhandled error action %x", err_action);
1605                 }
1606
1607                 if ((err_action & SS_MASK) >= SS_START) {
1608                         /*
1609                          * Drop the priority, so that the recovery
1610                          * CCB is the first to execute.  Freeze the queue
1611                          * after this command is sent so that we can
1612                          * restore the old csio and have it queued in
1613                          * the proper order before we release normal
1614                          * transactions to the device.
1615                          */
1616                         ccb->ccb_h.pinfo.priority--;
1617                         ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
1618                         ccb->ccb_h.saved_ccb_ptr = orig_ccb;
1619                         error = ERESTART;
1620                         *orig = orig_ccb;
1621                 }
1622
1623 sense_error_done:
1624                 *action = err_action;
1625         }
1626         return (error);
1627 }
1628
1629 /*
1630  * Generic error handler.  Peripheral drivers usually filter
1631  * out the errors that they handle in a unique manner, then
1632  * call this function.
1633  */
1634 int
1635 cam_periph_error(union ccb *ccb, cam_flags camflags,
1636                  u_int32_t sense_flags, union ccb *save_ccb)
1637 {
1638         struct cam_path *newpath;
1639         union ccb  *orig_ccb, *scan_ccb;
1640         struct cam_periph *periph;
1641         const char *action_string;
1642         cam_status  status;
1643         int         frozen, error, openings, devctl_err;
1644         u_int32_t   action, relsim_flags, timeout;
1645
1646         action = SSQ_PRINT_SENSE;
1647         periph = xpt_path_periph(ccb->ccb_h.path);
1648         action_string = NULL;
1649         status = ccb->ccb_h.status;
1650         frozen = (status & CAM_DEV_QFRZN) != 0;
1651         status &= CAM_STATUS_MASK;
1652         devctl_err = openings = relsim_flags = timeout = 0;
1653         orig_ccb = ccb;
1654
1655         /* Filter the errors that should be reported via devctl */
1656         switch (ccb->ccb_h.status & CAM_STATUS_MASK) {
1657         case CAM_CMD_TIMEOUT:
1658         case CAM_REQ_ABORTED:
1659         case CAM_REQ_CMP_ERR:
1660         case CAM_REQ_TERMIO:
1661         case CAM_UNREC_HBA_ERROR:
1662         case CAM_DATA_RUN_ERR:
1663         case CAM_SCSI_STATUS_ERROR:
1664         case CAM_ATA_STATUS_ERROR:
1665         case CAM_SMP_STATUS_ERROR:
1666                 devctl_err++;
1667                 break;
1668         default:
1669                 break;
1670         }
1671
1672         switch (status) {
1673         case CAM_REQ_CMP:
1674                 error = 0;
1675                 action &= ~SSQ_PRINT_SENSE;
1676                 break;
1677         case CAM_SCSI_STATUS_ERROR:
1678                 error = camperiphscsistatuserror(ccb, &orig_ccb,
1679                     camflags, sense_flags, &openings, &relsim_flags,
1680                     &timeout, &action, &action_string);
1681                 break;
1682         case CAM_AUTOSENSE_FAIL:
1683                 error = EIO;    /* we have to kill the command */
1684                 break;
1685         case CAM_UA_ABORT:
1686         case CAM_UA_TERMIO:
1687         case CAM_MSG_REJECT_REC:
1688                 /* XXX Don't know that these are correct */
1689                 error = EIO;
1690                 break;
1691         case CAM_SEL_TIMEOUT:
1692                 if ((camflags & CAM_RETRY_SELTO) != 0) {
1693                         if (ccb->ccb_h.retry_count > 0 &&
1694                             (periph->flags & CAM_PERIPH_INVALID) == 0) {
1695                                 ccb->ccb_h.retry_count--;
1696                                 error = ERESTART;
1697
1698                                 /*
1699                                  * Wait a bit to give the device
1700                                  * time to recover before we try again.
1701                                  */
1702                                 relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
1703                                 timeout = periph_selto_delay;
1704                                 break;
1705                         }
1706                         action_string = "Retries exhausted";
1707                 }
1708                 /* FALLTHROUGH */
1709         case CAM_DEV_NOT_THERE:
1710                 error = ENXIO;
1711                 action = SSQ_LOST;
1712                 break;
1713         case CAM_REQ_INVALID:
1714         case CAM_PATH_INVALID:
1715         case CAM_NO_HBA:
1716         case CAM_PROVIDE_FAIL:
1717         case CAM_REQ_TOO_BIG:
1718         case CAM_LUN_INVALID:
1719         case CAM_TID_INVALID:
1720         case CAM_FUNC_NOTAVAIL:
1721                 error = EINVAL;
1722                 break;
1723         case CAM_SCSI_BUS_RESET:
1724         case CAM_BDR_SENT:
1725                 /*
1726                  * Commands that repeatedly timeout and cause these
1727                  * kinds of error recovery actions, should return
1728                  * CAM_CMD_TIMEOUT, which allows us to safely assume
1729                  * that this command was an innocent bystander to
1730                  * these events and should be unconditionally
1731                  * retried.
1732                  */
1733         case CAM_REQUEUE_REQ:
1734                 /* Unconditional requeue if device is still there */
1735                 if (periph->flags & CAM_PERIPH_INVALID) {
1736                         action_string = "Periph was invalidated";
1737                         error = EIO;
1738                 } else if (sense_flags & SF_NO_RETRY) {
1739                         error = EIO;
1740                         action_string = "Retry was blocked";
1741                 } else {
1742                         error = ERESTART;
1743                         action &= ~SSQ_PRINT_SENSE;
1744                 }
1745                 break;
1746         case CAM_RESRC_UNAVAIL:
1747                 /* Wait a bit for the resource shortage to abate. */
1748                 timeout = periph_noresrc_delay;
1749                 /* FALLTHROUGH */
1750         case CAM_BUSY:
1751                 if (timeout == 0) {
1752                         /* Wait a bit for the busy condition to abate. */
1753                         timeout = periph_busy_delay;
1754                 }
1755                 relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
1756                 /* FALLTHROUGH */
1757         case CAM_ATA_STATUS_ERROR:
1758         case CAM_REQ_CMP_ERR:
1759         case CAM_CMD_TIMEOUT:
1760         case CAM_UNEXP_BUSFREE:
1761         case CAM_UNCOR_PARITY:
1762         case CAM_DATA_RUN_ERR:
1763         default:
1764                 if (periph->flags & CAM_PERIPH_INVALID) {
1765                         error = EIO;
1766                         action_string = "Periph was invalidated";
1767                 } else if (ccb->ccb_h.retry_count == 0) {
1768                         error = EIO;
1769                         action_string = "Retries exhausted";
1770                 } else if (sense_flags & SF_NO_RETRY) {
1771                         error = EIO;
1772                         action_string = "Retry was blocked";
1773                 } else {
1774                         ccb->ccb_h.retry_count--;
1775                         error = ERESTART;
1776                 }
1777                 break;
1778         }
1779
1780         if ((sense_flags & SF_PRINT_ALWAYS) ||
1781             CAM_DEBUGGED(ccb->ccb_h.path, CAM_DEBUG_INFO))
1782                 action |= SSQ_PRINT_SENSE;
1783         else if (sense_flags & SF_NO_PRINT)
1784                 action &= ~SSQ_PRINT_SENSE;
1785         if ((action & SSQ_PRINT_SENSE) != 0)
1786                 cam_error_print(orig_ccb, CAM_ESF_ALL, CAM_EPF_ALL);
1787         if (error != 0 && (action & SSQ_PRINT_SENSE) != 0) {
1788                 if (error != ERESTART) {
1789                         if (action_string == NULL)
1790                                 action_string = "Unretryable error";
1791                         xpt_print(ccb->ccb_h.path, "Error %d, %s\n",
1792                             error, action_string);
1793                 } else if (action_string != NULL)
1794                         xpt_print(ccb->ccb_h.path, "%s\n", action_string);
1795                 else
1796                         xpt_print(ccb->ccb_h.path, "Retrying command\n");
1797         }
1798
1799         if (devctl_err && (error != 0 || (action & SSQ_PRINT_SENSE) != 0))
1800                 cam_periph_devctl_notify(orig_ccb);
1801
1802         if ((action & SSQ_LOST) != 0) {
1803                 lun_id_t lun_id;
1804
1805                 /*
1806                  * For a selection timeout, we consider all of the LUNs on
1807                  * the target to be gone.  If the status is CAM_DEV_NOT_THERE,
1808                  * then we only get rid of the device(s) specified by the
1809                  * path in the original CCB.
1810                  */
1811                 if (status == CAM_SEL_TIMEOUT)
1812                         lun_id = CAM_LUN_WILDCARD;
1813                 else
1814                         lun_id = xpt_path_lun_id(ccb->ccb_h.path);
1815
1816                 /* Should we do more if we can't create the path?? */
1817                 if (xpt_create_path(&newpath, periph,
1818                                     xpt_path_path_id(ccb->ccb_h.path),
1819                                     xpt_path_target_id(ccb->ccb_h.path),
1820                                     lun_id) == CAM_REQ_CMP) {
1821
1822                         /*
1823                          * Let peripheral drivers know that this
1824                          * device has gone away.
1825                          */
1826                         xpt_async(AC_LOST_DEVICE, newpath, NULL);
1827                         xpt_free_path(newpath);
1828                 }
1829         }
1830
1831         /* Broadcast UNIT ATTENTIONs to all periphs. */
1832         if ((action & SSQ_UA) != 0)
1833                 xpt_async(AC_UNIT_ATTENTION, orig_ccb->ccb_h.path, orig_ccb);
1834
1835         /* Rescan target on "Reported LUNs data has changed" */
1836         if ((action & SSQ_RESCAN) != 0) {
1837                 if (xpt_create_path(&newpath, NULL,
1838                                     xpt_path_path_id(ccb->ccb_h.path),
1839                                     xpt_path_target_id(ccb->ccb_h.path),
1840                                     CAM_LUN_WILDCARD) == CAM_REQ_CMP) {
1841
1842                         scan_ccb = xpt_alloc_ccb_nowait();
1843                         if (scan_ccb != NULL) {
1844                                 scan_ccb->ccb_h.path = newpath;
1845                                 scan_ccb->ccb_h.func_code = XPT_SCAN_TGT;
1846                                 scan_ccb->crcn.flags = 0;
1847                                 xpt_rescan(scan_ccb);
1848                         } else {
1849                                 xpt_print(newpath,
1850                                     "Can't allocate CCB to rescan target\n");
1851                                 xpt_free_path(newpath);
1852                         }
1853                 }
1854         }
1855
1856         /* Attempt a retry */
1857         if (error == ERESTART || error == 0) {
1858                 if (frozen != 0)
1859                         ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
1860                 if (error == ERESTART)
1861                         xpt_action(ccb);
1862                 if (frozen != 0)
1863                         cam_release_devq(ccb->ccb_h.path,
1864                                          relsim_flags,
1865                                          openings,
1866                                          timeout,
1867                                          /*getcount_only*/0);
1868         }
1869
1870         return (error);
1871 }
1872
1873 #define CAM_PERIPH_DEVD_MSG_SIZE        256
1874
1875 static void
1876 cam_periph_devctl_notify(union ccb *ccb)
1877 {
1878         struct cam_periph *periph;
1879         struct ccb_getdev *cgd;
1880         struct sbuf sb;
1881         int serr, sk, asc, ascq;
1882         char *sbmsg, *type;
1883
1884         sbmsg = malloc(CAM_PERIPH_DEVD_MSG_SIZE, M_CAMPERIPH, M_NOWAIT);
1885         if (sbmsg == NULL)
1886                 return;
1887
1888         sbuf_new(&sb, sbmsg, CAM_PERIPH_DEVD_MSG_SIZE, SBUF_FIXEDLEN);
1889
1890         periph = xpt_path_periph(ccb->ccb_h.path);
1891         sbuf_printf(&sb, "device=%s%d ", periph->periph_name,
1892             periph->unit_number);
1893
1894         sbuf_printf(&sb, "serial=\"");
1895         if ((cgd = (struct ccb_getdev *)xpt_alloc_ccb_nowait()) != NULL) {
1896                 xpt_setup_ccb(&cgd->ccb_h, ccb->ccb_h.path,
1897                     CAM_PRIORITY_NORMAL);
1898                 cgd->ccb_h.func_code = XPT_GDEV_TYPE;
1899                 xpt_action((union ccb *)cgd);
1900
1901                 if (cgd->ccb_h.status == CAM_REQ_CMP)
1902                         sbuf_bcat(&sb, cgd->serial_num, cgd->serial_num_len);
1903                 xpt_free_ccb((union ccb *)cgd);
1904         }
1905         sbuf_printf(&sb, "\" ");
1906         sbuf_printf(&sb, "cam_status=\"0x%x\" ", ccb->ccb_h.status);
1907
1908         switch (ccb->ccb_h.status & CAM_STATUS_MASK) {
1909         case CAM_CMD_TIMEOUT:
1910                 sbuf_printf(&sb, "timeout=%d ", ccb->ccb_h.timeout);
1911                 type = "timeout";
1912                 break;
1913         case CAM_SCSI_STATUS_ERROR:
1914                 sbuf_printf(&sb, "scsi_status=%d ", ccb->csio.scsi_status);
1915                 if (scsi_extract_sense_ccb(ccb, &serr, &sk, &asc, &ascq))
1916                         sbuf_printf(&sb, "scsi_sense=\"%02x %02x %02x %02x\" ",
1917                             serr, sk, asc, ascq);
1918                 type = "error";
1919                 break;
1920         case CAM_ATA_STATUS_ERROR:
1921                 sbuf_printf(&sb, "RES=\"");
1922                 ata_res_sbuf(&ccb->ataio.res, &sb);
1923                 sbuf_printf(&sb, "\" ");
1924                 type = "error";
1925                 break;
1926         default:
1927                 type = "error";
1928                 break;
1929         }
1930
1931         if (ccb->ccb_h.func_code == XPT_SCSI_IO) {
1932                 sbuf_printf(&sb, "CDB=\"");
1933                 scsi_cdb_sbuf(scsiio_cdb_ptr(&ccb->csio), &sb);
1934                 sbuf_printf(&sb, "\" ");
1935         } else if (ccb->ccb_h.func_code == XPT_ATA_IO) {
1936                 sbuf_printf(&sb, "ACB=\"");
1937                 ata_cmd_sbuf(&ccb->ataio.cmd, &sb);
1938                 sbuf_printf(&sb, "\" ");
1939         }
1940
1941         if (sbuf_finish(&sb) == 0)
1942                 devctl_notify("CAM", "periph", type, sbuf_data(&sb));
1943         sbuf_delete(&sb);
1944         free(sbmsg, M_CAMPERIPH);
1945 }
1946