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 int
 143 periphdriver_unregister(void *data)
 144 {
 145         struct periph_driver *drv = (struct periph_driver *)data;
 146         int error, n;
 147
 148         /* If driver marked as early or it is late now, deinitialize it. */
 149         if (((drv->flags & CAM_PERIPH_DRV_EARLY) != 0 && initialized > 0) ||
 150             initialized > 1) {
 151                 if (drv->deinit == NULL) {
 152                         printf("CAM periph driver '%s' doesn't have deinit.\n",
 153                             drv->driver_name);
 154                         return (EOPNOTSUPP);
 155                 }
 156                 error = drv->deinit();
 157                 if (error != 0)
 158                         return (error);
 159         }
 160
 161         xpt_lock_buses();
 162         for (n = 0; n < nperiph_drivers && periph_drivers[n] != drv; n++)
 163                 ;
 164         KASSERT(n < nperiph_drivers,
 165             ("Periph driver '%s' was not registered", drv->driver_name));
 166         for (; n + 1 < nperiph_drivers; n++)
 167                 periph_drivers[n] = periph_drivers[n + 1];
 168         periph_drivers[n + 1] = NULL;
 169         nperiph_drivers--;
 170         xpt_unlock_buses();
 171         return (0);
 172 }
 173
 174 void
 175 periphdriver_init(int level)
 176 {
 177         int     i, early;
 178
 179         initialized = max(initialized, level);
 180         for (i = 0; periph_drivers[i] != NULL; i++) {
 181                 early = (periph_drivers[i]->flags & CAM_PERIPH_DRV_EARLY) ? 1 : 2;
 182                 if (early == initialized)
 183                         (*periph_drivers[i]->init)();
 184         }
 185 }
 186
 187 cam_status
 188 cam_periph_alloc(periph_ctor_t *periph_ctor,
 189                  periph_oninv_t *periph_oninvalidate,
 190                  periph_dtor_t *periph_dtor, periph_start_t *periph_start,
 191                  char *name, cam_periph_type type, struct cam_path *path,
 192                  ac_callback_t *ac_callback, ac_code code, void *arg)
 193 {
 194         struct          periph_driver **p_drv;
 195         struct          cam_sim *sim;
 196         struct          cam_periph *periph;
 197         struct          cam_periph *cur_periph;
 198         path_id_t       path_id;
 199         target_id_t     target_id;
 200         lun_id_t        lun_id;
 201         cam_status      status;
 202         u_int           init_level;
 203
 204         init_level = 0;
 205         /*
 206          * Handle Hot-Plug scenarios.  If there is already a peripheral
 207          * of our type assigned to this path, we are likely waiting for
 208          * final close on an old, invalidated, peripheral.  If this is
 209          * the case, queue up a deferred call to the peripheral's async
 210          * handler.  If it looks like a mistaken re-allocation, complain.
 211          */
 212         if ((periph = cam_periph_find(path, name)) != NULL) {
 213
 214                 if ((periph->flags & CAM_PERIPH_INVALID) != 0
 215                  && (periph->flags & CAM_PERIPH_NEW_DEV_FOUND) == 0) {
 216                         periph->flags |= CAM_PERIPH_NEW_DEV_FOUND;
 217                         periph->deferred_callback = ac_callback;
 218                         periph->deferred_ac = code;
 219                         return (CAM_REQ_INPROG);
 220                 } else {
 221                         printf("cam_periph_alloc: attempt to re-allocate "
 222                                "valid device %s%d rejected flags %#x "
 223                                "refcount %d\n", periph->periph_name,
 224                                periph->unit_number, periph->flags,
 225                                periph->refcount);
 226                 }
 227                 return (CAM_REQ_INVALID);
 228         }
 229
 230         periph = (struct cam_periph *)malloc(sizeof(*periph), M_CAMPERIPH,
 231                                              M_NOWAIT|M_ZERO);
 232
 233         if (periph == NULL)
 234                 return (CAM_RESRC_UNAVAIL);
 235
 236         init_level++;
 237
 238
 239         sim = xpt_path_sim(path);
 240         path_id = xpt_path_path_id(path);
 241         target_id = xpt_path_target_id(path);
 242         lun_id = xpt_path_lun_id(path);
 243         periph->periph_start = periph_start;
 244         periph->periph_dtor = periph_dtor;
 245         periph->periph_oninval = periph_oninvalidate;
 246         periph->type = type;
 247         periph->periph_name = name;
 248         periph->scheduled_priority = CAM_PRIORITY_NONE;
 249         periph->immediate_priority = CAM_PRIORITY_NONE;
 250         periph->refcount = 1;           /* Dropped by invalidation. */
 251         periph->sim = sim;
 252         SLIST_INIT(&periph->ccb_list);
 253         status = xpt_create_path(&path, periph, path_id, target_id, lun_id);
 254         if (status != CAM_REQ_CMP)
 255                 goto failure;
 256         periph->path = path;
 257
 258         xpt_lock_buses();
 259         for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
 260                 if (strcmp((*p_drv)->driver_name, name) == 0)
 261                         break;
 262         }
 263         if (*p_drv == NULL) {
 264                 printf("cam_periph_alloc: invalid periph name '%s'\n", name);
 265                 xpt_unlock_buses();
 266                 xpt_free_path(periph->path);
 267                 free(periph, M_CAMPERIPH);
 268                 return (CAM_REQ_INVALID);
 269         }
 270         periph->unit_number = camperiphunit(*p_drv, path_id, target_id, lun_id);
 271         cur_periph = TAILQ_FIRST(&(*p_drv)->units);
 272         while (cur_periph != NULL
 273             && cur_periph->unit_number < periph->unit_number)
 274                 cur_periph = TAILQ_NEXT(cur_periph, unit_links);
 275         if (cur_periph != NULL) {
 276                 KASSERT(cur_periph->unit_number != periph->unit_number, ("duplicate units on periph list"));
 277                 TAILQ_INSERT_BEFORE(cur_periph, periph, unit_links);
 278         } else {
 279                 TAILQ_INSERT_TAIL(&(*p_drv)->units, periph, unit_links);
 280                 (*p_drv)->generation++;
 281         }
 282         xpt_unlock_buses();
 283
 284         init_level++;
 285
 286         status = xpt_add_periph(periph);
 287         if (status != CAM_REQ_CMP)
 288                 goto failure;
 289
 290         init_level++;
 291         CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph created\n"));
 292
 293         status = periph_ctor(periph, arg);
 294
 295         if (status == CAM_REQ_CMP)
 296                 init_level++;
 297
 298 failure:
 299         switch (init_level) {
 300         case 4:
 301                 /* Initialized successfully */
 302                 break;
 303         case 3:
 304                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph destroyed\n"));
 305                 xpt_remove_periph(periph);
 306                 /* FALLTHROUGH */
 307         case 2:
 308                 xpt_lock_buses();
 309                 TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links);
 310                 xpt_unlock_buses();
 311                 xpt_free_path(periph->path);
 312                 /* FALLTHROUGH */
 313         case 1:
 314                 free(periph, M_CAMPERIPH);
 315                 /* FALLTHROUGH */
 316         case 0:
 317                 /* No cleanup to perform. */
 318                 break;
 319         default:
 320                 panic("%s: Unknown init level", __func__);
 321         }
 322         return(status);
 323 }
 324
 325 /*
 326  * Find a peripheral structure with the specified path, target, lun,
 327  * and (optionally) type.  If the name is NULL, this function will return
 328  * the first peripheral driver that matches the specified path.
 329  */
 330 struct cam_periph *
 331 cam_periph_find(struct cam_path *path, char *name)
 332 {
 333         struct periph_driver **p_drv;
 334         struct cam_periph *periph;
 335
 336         xpt_lock_buses();
 337         for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
 338
 339                 if (name != NULL && (strcmp((*p_drv)->driver_name, name) != 0))
 340                         continue;
 341
 342                 TAILQ_FOREACH(periph, &(*p_drv)->units, unit_links) {
 343                         if (xpt_path_comp(periph->path, path) == 0) {
 344                                 xpt_unlock_buses();
 345                                 cam_periph_assert(periph, MA_OWNED);
 346                                 return(periph);
 347                         }
 348                 }
 349                 if (name != NULL) {
 350                         xpt_unlock_buses();
 351                         return(NULL);
 352                 }
 353         }
 354         xpt_unlock_buses();
 355         return(NULL);
 356 }
 357
 358 /*
 359  * Find peripheral driver instances attached to the specified path.
 360  */
 361 int
 362 cam_periph_list(struct cam_path *path, struct sbuf *sb)
 363 {
 364         struct sbuf local_sb;
 365         struct periph_driver **p_drv;
 366         struct cam_periph *periph;
 367         int count;
 368         int sbuf_alloc_len;
 369
 370         sbuf_alloc_len = 16;
 371 retry:
 372         sbuf_new(&local_sb, NULL, sbuf_alloc_len, SBUF_FIXEDLEN);
 373         count = 0;
 374         xpt_lock_buses();
 375         for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
 376
 377                 TAILQ_FOREACH(periph, &(*p_drv)->units, unit_links) {
 378                         if (xpt_path_comp(periph->path, path) != 0)
 379                                 continue;
 380
 381                         if (sbuf_len(&local_sb) != 0)
 382                                 sbuf_cat(&local_sb, ",");
 383
 384                         sbuf_printf(&local_sb, "%s%d", periph->periph_name,
 385                                     periph->unit_number);
 386
 387                         if (sbuf_error(&local_sb) == ENOMEM) {
 388                                 sbuf_alloc_len *= 2;
 389                                 xpt_unlock_buses();
 390                                 sbuf_delete(&local_sb);
 391                                 goto retry;
 392                         }
 393                         count++;
 394                 }
 395         }
 396         xpt_unlock_buses();
 397         sbuf_finish(&local_sb);
 398         sbuf_cpy(sb, sbuf_data(&local_sb));
 399         sbuf_delete(&local_sb);
 400         return (count);
 401 }
 402
 403 cam_status
 404 cam_periph_acquire(struct cam_periph *periph)
 405 {
 406         cam_status status;
 407
 408         status = CAM_REQ_CMP_ERR;
 409         if (periph == NULL)
 410                 return (status);
 411
 412         xpt_lock_buses();
 413         if ((periph->flags & CAM_PERIPH_INVALID) == 0) {
 414                 periph->refcount++;
 415                 status = CAM_REQ_CMP;
 416         }
 417         xpt_unlock_buses();
 418
 419         return (status);
 420 }
 421
 422 void
 423 cam_periph_doacquire(struct cam_periph *periph)
 424 {
 425
 426         xpt_lock_buses();
 427         KASSERT(periph->refcount >= 1,
 428             ("cam_periph_doacquire() with refcount == %d", periph->refcount));
 429         periph->refcount++;
 430         xpt_unlock_buses();
 431 }
 432
 433 void
 434 cam_periph_release_locked_buses(struct cam_periph *periph)
 435 {
 436
 437         cam_periph_assert(periph, MA_OWNED);
 438         KASSERT(periph->refcount >= 1, ("periph->refcount >= 1"));
 439         if (--periph->refcount == 0)
 440                 camperiphfree(periph);
 441 }
 442
 443 void
 444 cam_periph_release_locked(struct cam_periph *periph)
 445 {
 446
 447         if (periph == NULL)
 448                 return;
 449
 450         xpt_lock_buses();
 451         cam_periph_release_locked_buses(periph);
 452         xpt_unlock_buses();
 453 }
 454
 455 void
 456 cam_periph_release(struct cam_periph *periph)
 457 {
 458         struct mtx *mtx;
 459
 460         if (periph == NULL)
 461                 return;
 462
 463         cam_periph_assert(periph, MA_NOTOWNED);
 464         mtx = cam_periph_mtx(periph);
 465         mtx_lock(mtx);
 466         cam_periph_release_locked(periph);
 467         mtx_unlock(mtx);
 468 }
 469
 470 int
 471 cam_periph_hold(struct cam_periph *periph, int priority)
 472 {
 473         int error;
 474
 475         /*
 476          * Increment the reference count on the peripheral
 477          * while we wait for our lock attempt to succeed
 478          * to ensure the peripheral doesn't disappear out
 479          * from user us while we sleep.
 480          */
 481
 482         if (cam_periph_acquire(periph) != CAM_REQ_CMP)
 483                 return (ENXIO);
 484
 485         cam_periph_assert(periph, MA_OWNED);
 486         while ((periph->flags & CAM_PERIPH_LOCKED) != 0) {
 487                 periph->flags |= CAM_PERIPH_LOCK_WANTED;
 488                 if ((error = cam_periph_sleep(periph, periph, priority,
 489                     "caplck", 0)) != 0) {
 490                         cam_periph_release_locked(periph);
 491                         return (error);
 492                 }
 493                 if (periph->flags & CAM_PERIPH_INVALID) {
 494                         cam_periph_release_locked(periph);
 495                         return (ENXIO);
 496                 }
 497         }
 498
 499         periph->flags |= CAM_PERIPH_LOCKED;
 500         return (0);
 501 }
 502
 503 void
 504 cam_periph_unhold(struct cam_periph *periph)
 505 {
 506
 507         cam_periph_assert(periph, MA_OWNED);
 508
 509         periph->flags &= ~CAM_PERIPH_LOCKED;
 510         if ((periph->flags & CAM_PERIPH_LOCK_WANTED) != 0) {
 511                 periph->flags &= ~CAM_PERIPH_LOCK_WANTED;
 512                 wakeup(periph);
 513         }
 514
 515         cam_periph_release_locked(periph);
 516 }
 517
 518 /*
 519  * Look for the next unit number that is not currently in use for this
 520  * peripheral type starting at "newunit".  Also exclude unit numbers that
 521  * are reserved by for future "hardwiring" unless we already know that this
 522  * is a potential wired device.  Only assume that the device is "wired" the
 523  * first time through the loop since after that we'll be looking at unit
 524  * numbers that did not match a wiring entry.
 525  */
 526 static u_int
 527 camperiphnextunit(struct periph_driver *p_drv, u_int newunit, int wired,
 528                   path_id_t pathid, target_id_t target, lun_id_t lun)
 529 {
 530         struct  cam_periph *periph;
 531         char    *periph_name;
 532         int     i, val, dunit, r;
 533         const char *dname, *strval;
 534
 535         periph_name = p_drv->driver_name;
 536         for (;;newunit++) {
 537
 538                 for (periph = TAILQ_FIRST(&p_drv->units);
 539                      periph != NULL && periph->unit_number != newunit;
 540                      periph = TAILQ_NEXT(periph, unit_links))
 541                         ;
 542
 543                 if (periph != NULL && periph->unit_number == newunit) {
 544                         if (wired != 0) {
 545                                 xpt_print(periph->path, "Duplicate Wired "
 546                                     "Device entry!\n");
 547                                 xpt_print(periph->path, "Second device (%s "
 548                                     "device at scbus%d target %d lun %d) will "
 549                                     "not be wired\n", periph_name, pathid,
 550                                     target, lun);
 551                                 wired = 0;
 552                         }
 553                         continue;
 554                 }
 555                 if (wired)
 556                         break;
 557
 558                 /*
 559                  * Don't match entries like "da 4" as a wired down
 560                  * device, but do match entries like "da 4 target 5"
 561                  * or even "da 4 scbus 1".
 562                  */
 563                 i = 0;
 564                 dname = periph_name;
 565                 for (;;) {
 566                         r = resource_find_dev(&i, dname, &dunit, NULL, NULL);
 567                         if (r != 0)
 568                                 break;
 569                         /* if no "target" and no specific scbus, skip */
 570                         if (resource_int_value(dname, dunit, "target", &val) &&
 571                             (resource_string_value(dname, dunit, "at",&strval)||
 572                              strcmp(strval, "scbus") == 0))
 573                                 continue;
 574                         if (newunit == dunit)
 575                                 break;
 576                 }
 577                 if (r != 0)
 578                         break;
 579         }
 580         return (newunit);
 581 }
 582
 583 static u_int
 584 camperiphunit(struct periph_driver *p_drv, path_id_t pathid,
 585               target_id_t target, lun_id_t lun)
 586 {
 587         u_int   unit;
 588         int     wired, i, val, dunit;
 589         const char *dname, *strval;
 590         char    pathbuf[32], *periph_name;
 591
 592         periph_name = p_drv->driver_name;
 593         snprintf(pathbuf, sizeof(pathbuf), "scbus%d", pathid);
 594         unit = 0;
 595         i = 0;
 596         dname = periph_name;
 597         for (wired = 0; resource_find_dev(&i, dname, &dunit, NULL, NULL) == 0;
 598              wired = 0) {
 599                 if (resource_string_value(dname, dunit, "at", &strval) == 0) {
 600                         if (strcmp(strval, pathbuf) != 0)
 601                                 continue;
 602                         wired++;
 603                 }
 604                 if (resource_int_value(dname, dunit, "target", &val) == 0) {
 605                         if (val != target)
 606                                 continue;
 607                         wired++;
 608                 }
 609                 if (resource_int_value(dname, dunit, "lun", &val) == 0) {
 610                         if (val != lun)
 611                                 continue;
 612                         wired++;
 613                 }
 614                 if (wired != 0) {
 615                         unit = dunit;
 616                         break;
 617                 }
 618         }
 619
 620         /*
 621          * Either start from 0 looking for the next unit or from
 622          * the unit number given in the resource config.  This way,
 623          * if we have wildcard matches, we don't return the same
 624          * unit number twice.
 625          */
 626         unit = camperiphnextunit(p_drv, unit, wired, pathid, target, lun);
 627
 628         return (unit);
 629 }
 630
 631 void
 632 cam_periph_invalidate(struct cam_periph *periph)
 633 {
 634
 635         cam_periph_assert(periph, MA_OWNED);
 636         /*
 637          * We only call this routine the first time a peripheral is
 638          * invalidated.
 639          */
 640         if ((periph->flags & CAM_PERIPH_INVALID) != 0)
 641                 return;
 642
 643         CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph invalidated\n"));
 644         if ((periph->flags & CAM_PERIPH_ANNOUNCED) && !rebooting)
 645                 xpt_denounce_periph(periph);
 646         periph->flags |= CAM_PERIPH_INVALID;
 647         periph->flags &= ~CAM_PERIPH_NEW_DEV_FOUND;
 648         if (periph->periph_oninval != NULL)
 649                 periph->periph_oninval(periph);
 650         cam_periph_release_locked(periph);
 651 }
 652
 653 static void
 654 camperiphfree(struct cam_periph *periph)
 655 {
 656         struct periph_driver **p_drv;
 657
 658         cam_periph_assert(periph, MA_OWNED);
 659         KASSERT(periph->periph_allocating == 0, ("%s%d: freed while allocating",
 660             periph->periph_name, periph->unit_number));
 661         for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
 662                 if (strcmp((*p_drv)->driver_name, periph->periph_name) == 0)
 663                         break;
 664         }
 665         if (*p_drv == NULL) {
 666                 printf("camperiphfree: attempt to free non-existant periph\n");
 667                 return;
 668         }
 669
 670         /*
 671          * We need to set this flag before dropping the topology lock, to
 672          * let anyone who is traversing the list that this peripheral is
 673          * about to be freed, and there will be no more reference count
 674          * checks.
 675          */
 676         periph->flags |= CAM_PERIPH_FREE;
 677
 678         /*
 679          * The peripheral destructor semantics dictate calling with only the
 680          * SIM mutex held.  Since it might sleep, it should not be called
 681          * with the topology lock held.
 682          */
 683         xpt_unlock_buses();
 684
 685         /*
 686          * We need to call the peripheral destructor prior to removing the
 687          * peripheral from the list.  Otherwise, we risk running into a
 688          * scenario where the peripheral unit number may get reused
 689          * (because it has been removed from the list), but some resources
 690          * used by the peripheral are still hanging around.  In particular,
 691          * the devfs nodes used by some peripherals like the pass(4) driver
 692          * aren't fully cleaned up until the destructor is run.  If the
 693          * unit number is reused before the devfs instance is fully gone,
 694          * devfs will panic.
 695          */
 696         if (periph->periph_dtor != NULL)
 697                 periph->periph_dtor(periph);
 698
 699         /*
 700          * The peripheral list is protected by the topology lock.
 701          */
 702         xpt_lock_buses();
 703
 704         TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links);
 705         (*p_drv)->generation++;
 706
 707         xpt_remove_periph(periph);
 708
 709         xpt_unlock_buses();
 710         if ((periph->flags & CAM_PERIPH_ANNOUNCED) && !rebooting)
 711                 xpt_print(periph->path, "Periph destroyed\n");
 712         else
 713                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph destroyed\n"));
 714
 715         if (periph->flags & CAM_PERIPH_NEW_DEV_FOUND) {
 716                 union ccb ccb;
 717                 void *arg;
 718
 719                 switch (periph->deferred_ac) {
 720                 case AC_FOUND_DEVICE:
 721                         ccb.ccb_h.func_code = XPT_GDEV_TYPE;
 722                         xpt_setup_ccb(&ccb.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 723                         xpt_action(&ccb);
 724                         arg = &ccb;
 725                         break;
 726                 case AC_PATH_REGISTERED:
 727                         ccb.ccb_h.func_code = XPT_PATH_INQ;
 728                         xpt_setup_ccb(&ccb.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 729                         xpt_action(&ccb);
 730                         arg = &ccb;
 731                         break;
 732                 default:
 733                         arg = NULL;
 734                         break;
 735                 }
 736                 periph->deferred_callback(NULL, periph->deferred_ac,
 737                                           periph->path, arg);
 738         }
 739         xpt_free_path(periph->path);
 740         free(periph, M_CAMPERIPH);
 741         xpt_lock_buses();
 742 }
 743
 744 /*
 745  * Map user virtual pointers into kernel virtual address space, so we can
 746  * access the memory.  This is now a generic function that centralizes most
 747  * of the sanity checks on the data flags, if any.
 748  * This also only works for up to MAXPHYS memory.  Since we use
 749  * buffers to map stuff in and out, we're limited to the buffer size.
 750  */
 751 int
 752 cam_periph_mapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo,
 753     u_int maxmap)
 754 {
 755         int numbufs, i, j;
 756         int flags[CAM_PERIPH_MAXMAPS];
 757         u_int8_t **data_ptrs[CAM_PERIPH_MAXMAPS];
 758         u_int32_t lengths[CAM_PERIPH_MAXMAPS];
 759         u_int32_t dirs[CAM_PERIPH_MAXMAPS];
 760
 761         if (maxmap == 0)
 762                 maxmap = DFLTPHYS;      /* traditional default */
 763         else if (maxmap > MAXPHYS)
 764                 maxmap = MAXPHYS;       /* for safety */
 765         switch(ccb->ccb_h.func_code) {
 766         case XPT_DEV_MATCH:
 767                 if (ccb->cdm.match_buf_len == 0) {
 768                         printf("cam_periph_mapmem: invalid match buffer "
 769                                "length 0\n");
 770                         return(EINVAL);
 771                 }
 772                 if (ccb->cdm.pattern_buf_len > 0) {
 773                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.patterns;
 774                         lengths[0] = ccb->cdm.pattern_buf_len;
 775                         dirs[0] = CAM_DIR_OUT;
 776                         data_ptrs[1] = (u_int8_t **)&ccb->cdm.matches;
 777                         lengths[1] = ccb->cdm.match_buf_len;
 778                         dirs[1] = CAM_DIR_IN;
 779                         numbufs = 2;
 780                 } else {
 781                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.matches;
 782                         lengths[0] = ccb->cdm.match_buf_len;
 783                         dirs[0] = CAM_DIR_IN;
 784                         numbufs = 1;
 785                 }
 786                 /*
 787                  * This request will not go to the hardware, no reason
 788                  * to be so strict. vmapbuf() is able to map up to MAXPHYS.
 789                  */
 790                 maxmap = MAXPHYS;
 791                 break;
 792         case XPT_SCSI_IO:
 793         case XPT_CONT_TARGET_IO:
 794                 if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_NONE)
 795                         return(0);
 796                 if ((ccb->ccb_h.flags & CAM_DATA_MASK) != CAM_DATA_VADDR)
 797                         return (EINVAL);
 798                 data_ptrs[0] = &ccb->csio.data_ptr;
 799                 lengths[0] = ccb->csio.dxfer_len;
 800                 dirs[0] = ccb->ccb_h.flags & CAM_DIR_MASK;
 801                 numbufs = 1;
 802                 break;
 803         case XPT_ATA_IO:
 804                 if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_NONE)
 805                         return(0);
 806                 if ((ccb->ccb_h.flags & CAM_DATA_MASK) != CAM_DATA_VADDR)
 807                         return (EINVAL);
 808                 data_ptrs[0] = &ccb->ataio.data_ptr;
 809                 lengths[0] = ccb->ataio.dxfer_len;
 810                 dirs[0] = ccb->ccb_h.flags & CAM_DIR_MASK;
 811                 numbufs = 1;
 812                 break;
 813         case XPT_SMP_IO:
 814                 data_ptrs[0] = &ccb->smpio.smp_request;
 815                 lengths[0] = ccb->smpio.smp_request_len;
 816                 dirs[0] = CAM_DIR_OUT;
 817                 data_ptrs[1] = &ccb->smpio.smp_response;
 818                 lengths[1] = ccb->smpio.smp_response_len;
 819                 dirs[1] = CAM_DIR_IN;
 820                 numbufs = 2;
 821                 break;
 822         case XPT_DEV_ADVINFO:
 823                 if (ccb->cdai.bufsiz == 0)
 824                         return (0);
 825
 826                 data_ptrs[0] = (uint8_t **)&ccb->cdai.buf;
 827                 lengths[0] = ccb->cdai.bufsiz;
 828                 dirs[0] = CAM_DIR_IN;
 829                 numbufs = 1;
 830
 831                 /*
 832                  * This request will not go to the hardware, no reason
 833                  * to be so strict. vmapbuf() is able to map up to MAXPHYS.
 834                  */
 835                 maxmap = MAXPHYS;
 836                 break;
 837         default:
 838                 return(EINVAL);
 839                 break; /* NOTREACHED */
 840         }
 841
 842         /*
 843          * Check the transfer length and permissions first, so we don't
 844          * have to unmap any previously mapped buffers.
 845          */
 846         for (i = 0; i < numbufs; i++) {
 847
 848                 flags[i] = 0;
 849
 850                 /*
 851                  * The userland data pointer passed in may not be page
 852                  * aligned.  vmapbuf() truncates the address to a page
 853                  * boundary, so if the address isn't page aligned, we'll
 854                  * need enough space for the given transfer length, plus
 855                  * whatever extra space is necessary to make it to the page
 856                  * boundary.
 857                  */
 858                 if ((lengths[i] +
 859                     (((vm_offset_t)(*data_ptrs[i])) & PAGE_MASK)) > maxmap){
 860                         printf("cam_periph_mapmem: attempt to map %lu bytes, "
 861                                "which is greater than %lu\n",
 862                                (long)(lengths[i] +
 863                                (((vm_offset_t)(*data_ptrs[i])) & PAGE_MASK)),
 864                                (u_long)maxmap);
 865                         return(E2BIG);
 866                 }
 867
 868                 if (dirs[i] & CAM_DIR_OUT) {
 869                         flags[i] = BIO_WRITE;
 870                 }
 871
 872                 if (dirs[i] & CAM_DIR_IN) {
 873                         flags[i] = BIO_READ;
 874                 }
 875
 876         }
 877
 878         /*
 879          * This keeps the kernel stack of current thread from getting
 880          * swapped.  In low-memory situations where the kernel stack might
 881          * otherwise get swapped out, this holds it and allows the thread
 882          * to make progress and release the kernel mapped pages sooner.
 883          *
 884          * XXX KDM should I use P_NOSWAP instead?
 885          */
 886         PHOLD(curproc);
 887
 888         for (i = 0; i < numbufs; i++) {
 889                 /*
 890                  * Get the buffer.
 891                  */
 892                 mapinfo->bp[i] = getpbuf(NULL);
 893
 894                 /* put our pointer in the data slot */
 895                 mapinfo->bp[i]->b_data = *data_ptrs[i];
 896
 897                 /* save the user's data address */
 898                 mapinfo->bp[i]->b_caller1 = *data_ptrs[i];
 899
 900                 /* set the transfer length, we know it's < MAXPHYS */
 901                 mapinfo->bp[i]->b_bufsize = lengths[i];
 902
 903                 /* set the direction */
 904                 mapinfo->bp[i]->b_iocmd = flags[i];
 905
 906                 /*
 907                  * Map the buffer into kernel memory.
 908                  *
 909                  * Note that useracc() alone is not a  sufficient test.
 910                  * vmapbuf() can still fail due to a smaller file mapped
 911                  * into a larger area of VM, or if userland races against
 912                  * vmapbuf() after the useracc() check.
 913                  */
 914                 if (vmapbuf(mapinfo->bp[i], 1) < 0) {
 915                         for (j = 0; j < i; ++j) {
 916                                 *data_ptrs[j] = mapinfo->bp[j]->b_caller1;
 917                                 vunmapbuf(mapinfo->bp[j]);
 918                                 relpbuf(mapinfo->bp[j], NULL);
 919                         }
 920                         relpbuf(mapinfo->bp[i], NULL);
 921                         PRELE(curproc);
 922                         return(EACCES);
 923                 }
 924
 925                 /* set our pointer to the new mapped area */
 926                 *data_ptrs[i] = mapinfo->bp[i]->b_data;
 927
 928                 mapinfo->num_bufs_used++;
 929         }
 930
 931         /*
 932          * Now that we've gotten this far, change ownership to the kernel
 933          * of the buffers so that we don't run afoul of returning to user
 934          * space with locks (on the buffer) held.
 935          */
 936         for (i = 0; i < numbufs; i++) {
 937                 BUF_KERNPROC(mapinfo->bp[i]);
 938         }
 939
 940
 941         return(0);
 942 }
 943
 944 /*
 945  * Unmap memory segments mapped into kernel virtual address space by
 946  * cam_periph_mapmem().
 947  */
 948 void
 949 cam_periph_unmapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo)
 950 {
 951         int numbufs, i;
 952         u_int8_t **data_ptrs[CAM_PERIPH_MAXMAPS];
 953
 954         if (mapinfo->num_bufs_used <= 0) {
 955                 /* nothing to free and the process wasn't held. */
 956                 return;
 957         }
 958
 959         switch (ccb->ccb_h.func_code) {
 960         case XPT_DEV_MATCH:
 961                 numbufs = min(mapinfo->num_bufs_used, 2);
 962
 963                 if (numbufs == 1) {
 964                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.matches;
 965                 } else {
 966                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.patterns;
 967                         data_ptrs[1] = (u_int8_t **)&ccb->cdm.matches;
 968                 }
 969                 break;
 970         case XPT_SCSI_IO:
 971         case XPT_CONT_TARGET_IO:
 972                 data_ptrs[0] = &ccb->csio.data_ptr;
 973                 numbufs = min(mapinfo->num_bufs_used, 1);
 974                 break;
 975         case XPT_ATA_IO:
 976                 data_ptrs[0] = &ccb->ataio.data_ptr;
 977                 numbufs = min(mapinfo->num_bufs_used, 1);
 978                 break;
 979         case XPT_SMP_IO:
 980                 numbufs = min(mapinfo->num_bufs_used, 2);
 981                 data_ptrs[0] = &ccb->smpio.smp_request;
 982                 data_ptrs[1] = &ccb->smpio.smp_response;
 983                 break;
 984         case XPT_DEV_ADVINFO:
 985                 numbufs = min(mapinfo->num_bufs_used, 1);
 986                 data_ptrs[0] = (uint8_t **)&ccb->cdai.buf;
 987                 break;
 988         default:
 989                 /* allow ourselves to be swapped once again */
 990                 PRELE(curproc);
 991                 return;
 992                 break; /* NOTREACHED */
 993         }
 994
 995         for (i = 0; i < numbufs; i++) {
 996                 /* Set the user's pointer back to the original value */
 997                 *data_ptrs[i] = mapinfo->bp[i]->b_caller1;
 998
 999                 /* unmap the buffer */
1000                 vunmapbuf(mapinfo->bp[i]);
1001
1002                 /* release the buffer */
1003                 relpbuf(mapinfo->bp[i], NULL);
1004         }
1005
1006         /* allow ourselves to be swapped once again */
1007         PRELE(curproc);
1008 }
1009
1010 int
1011 cam_periph_ioctl(struct cam_periph *periph, u_long cmd, caddr_t addr,
1012                  int (*error_routine)(union ccb *ccb,
1013                                       cam_flags camflags,
1014                                       u_int32_t sense_flags))
1015 {
1016         union ccb            *ccb;
1017         int                  error;
1018         int                  found;
1019
1020         error = found = 0;
1021
1022         switch(cmd){
1023         case CAMGETPASSTHRU:
1024                 ccb = cam_periph_getccb(periph, CAM_PRIORITY_NORMAL);
1025                 xpt_setup_ccb(&ccb->ccb_h,
1026                               ccb->ccb_h.path,
1027                               CAM_PRIORITY_NORMAL);
1028                 ccb->ccb_h.func_code = XPT_GDEVLIST;
1029
1030                 /*
1031                  * Basically, the point of this is that we go through
1032                  * getting the list of devices, until we find a passthrough
1033                  * device.  In the current version of the CAM code, the
1034                  * only way to determine what type of device we're dealing
1035                  * with is by its name.
1036                  */
1037                 while (found == 0) {
1038                         ccb->cgdl.index = 0;
1039                         ccb->cgdl.status = CAM_GDEVLIST_MORE_DEVS;
1040                         while (ccb->cgdl.status == CAM_GDEVLIST_MORE_DEVS) {
1041
1042                                 /* we want the next device in the list */
1043                                 xpt_action(ccb);
1044                                 if (strncmp(ccb->cgdl.periph_name,
1045                                     "pass", 4) == 0){
1046                                         found = 1;
1047                                         break;
1048                                 }
1049                         }
1050                         if ((ccb->cgdl.status == CAM_GDEVLIST_LAST_DEVICE) &&
1051                             (found == 0)) {
1052                                 ccb->cgdl.periph_name[0] = '\0';
1053                                 ccb->cgdl.unit_number = 0;
1054                                 break;
1055                         }
1056                 }
1057
1058                 /* copy the result back out */
1059                 bcopy(ccb, addr, sizeof(union ccb));
1060
1061                 /* and release the ccb */
1062                 xpt_release_ccb(ccb);
1063
1064                 break;
1065         default:
1066                 error = ENOTTY;
1067                 break;
1068         }
1069         return(error);
1070 }
1071
1072 static void
1073 cam_periph_done_panic(struct cam_periph *periph, union ccb *done_ccb)
1074 {
1075
1076         panic("%s: already done with ccb %p", __func__, done_ccb);
1077 }
1078
1079 static void
1080 cam_periph_done(struct cam_periph *periph, union ccb *done_ccb)
1081 {
1082
1083         /* Caller will release the CCB */
1084         xpt_path_assert(done_ccb->ccb_h.path, MA_OWNED);
1085         done_ccb->ccb_h.cbfcnp = cam_periph_done_panic;
1086         wakeup(&done_ccb->ccb_h.cbfcnp);
1087 }
1088
1089 static void
1090 cam_periph_ccbwait(union ccb *ccb)
1091 {
1092
1093         if ((ccb->ccb_h.func_code & XPT_FC_QUEUED) != 0) {
1094                 while (ccb->ccb_h.cbfcnp != cam_periph_done_panic)
1095                         xpt_path_sleep(ccb->ccb_h.path, &ccb->ccb_h.cbfcnp,
1096                             PRIBIO, "cbwait", 0);
1097         }
1098         KASSERT(ccb->ccb_h.pinfo.index == CAM_UNQUEUED_INDEX &&
1099             (ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_INPROG,
1100             ("%s: proceeding with incomplete ccb: ccb=%p, func_code=%#x, "
1101              "status=%#x, index=%d", __func__, ccb, ccb->ccb_h.func_code,
1102              ccb->ccb_h.status, ccb->ccb_h.pinfo.index));
1103 }
1104
1105 int
1106 cam_periph_runccb(union ccb *ccb,
1107                   int (*error_routine)(union ccb *ccb,
1108                                        cam_flags camflags,
1109                                        u_int32_t sense_flags),
1110                   cam_flags camflags, u_int32_t sense_flags,
1111                   struct devstat *ds)
1112 {
1113         struct bintime *starttime;
1114         struct bintime ltime;
1115         int error;
1116
1117         starttime = NULL;
1118         xpt_path_assert(ccb->ccb_h.path, MA_OWNED);
1119         KASSERT((ccb->ccb_h.flags & CAM_UNLOCKED) == 0,
1120             ("%s: ccb=%p, func_code=%#x, flags=%#x", __func__, ccb,
1121              ccb->ccb_h.func_code, ccb->ccb_h.flags));
1122
1123         /*
1124          * If the user has supplied a stats structure, and if we understand
1125          * this particular type of ccb, record the transaction start.
1126          */
1127         if ((ds != NULL) && (ccb->ccb_h.func_code == XPT_SCSI_IO ||
1128             ccb->ccb_h.func_code == XPT_ATA_IO)) {
1129                 starttime = &ltime;
1130                 binuptime(starttime);
1131                 devstat_start_transaction(ds, starttime);
1132         }
1133
1134         ccb->ccb_h.cbfcnp = cam_periph_done;
1135         xpt_action(ccb);
1136
1137         do {
1138                 cam_periph_ccbwait(ccb);
1139                 if ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP)
1140                         error = 0;
1141                 else if (error_routine != NULL) {
1142                         ccb->ccb_h.cbfcnp = cam_periph_done;
1143                         error = (*error_routine)(ccb, camflags, sense_flags);
1144                 } else
1145                         error = 0;
1146
1147         } while (error == ERESTART);
1148
1149         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) {
1150                 cam_release_devq(ccb->ccb_h.path,
1151                                  /* relsim_flags */0,
1152                                  /* openings */0,
1153                                  /* timeout */0,
1154                                  /* getcount_only */ FALSE);
1155                 ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
1156         }
1157
1158         if (ds != NULL) {
1159                 if (ccb->ccb_h.func_code == XPT_SCSI_IO) {
1160                         devstat_end_transaction(ds,
1161                                         ccb->csio.dxfer_len - ccb->csio.resid,
1162                                         ccb->csio.tag_action & 0x3,
1163                                         ((ccb->ccb_h.flags & CAM_DIR_MASK) ==
1164                                         CAM_DIR_NONE) ?  DEVSTAT_NO_DATA :
1165                                         (ccb->ccb_h.flags & CAM_DIR_OUT) ?
1166                                         DEVSTAT_WRITE :
1167                                         DEVSTAT_READ, NULL, starttime);
1168                 } else if (ccb->ccb_h.func_code == XPT_ATA_IO) {
1169                         devstat_end_transaction(ds,
1170                                         ccb->ataio.dxfer_len - ccb->ataio.resid,
1171                                         0, /* Not used in ATA */
1172                                         ((ccb->ccb_h.flags & CAM_DIR_MASK) ==
1173                                         CAM_DIR_NONE) ?  DEVSTAT_NO_DATA :
1174                                         (ccb->ccb_h.flags & CAM_DIR_OUT) ?
1175                                         DEVSTAT_WRITE :
1176                                         DEVSTAT_READ, NULL, starttime);
1177                 }
1178         }
1179
1180         return(error);
1181 }
1182
1183 void
1184 cam_freeze_devq(struct cam_path *path)
1185 {
1186         struct ccb_hdr ccb_h;
1187
1188         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("cam_freeze_devq\n"));
1189         xpt_setup_ccb(&ccb_h, path, /*priority*/1);
1190         ccb_h.func_code = XPT_NOOP;
1191         ccb_h.flags = CAM_DEV_QFREEZE;
1192         xpt_action((union ccb *)&ccb_h);
1193 }
1194
1195 u_int32_t
1196 cam_release_devq(struct cam_path *path, u_int32_t relsim_flags,
1197                  u_int32_t openings, u_int32_t arg,
1198                  int getcount_only)
1199 {
1200         struct ccb_relsim crs;
1201
1202         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("cam_release_devq(%u, %u, %u, %d)\n",
1203             relsim_flags, openings, arg, getcount_only));
1204         xpt_setup_ccb(&crs.ccb_h, path, CAM_PRIORITY_NORMAL);
1205         crs.ccb_h.func_code = XPT_REL_SIMQ;
1206         crs.ccb_h.flags = getcount_only ? CAM_DEV_QFREEZE : 0;
1207         crs.release_flags = relsim_flags;
1208         crs.openings = openings;
1209         crs.release_timeout = arg;
1210         xpt_action((union ccb *)&crs);
1211         return (crs.qfrozen_cnt);
1212 }
1213
1214 #define saved_ccb_ptr ppriv_ptr0
1215 static void
1216 camperiphdone(struct cam_periph *periph, union ccb *done_ccb)
1217 {
1218         union ccb      *saved_ccb;
1219         cam_status      status;
1220         struct scsi_start_stop_unit *scsi_cmd;
1221         int    error_code, sense_key, asc, ascq;
1222
1223         scsi_cmd = (struct scsi_start_stop_unit *)
1224             &done_ccb->csio.cdb_io.cdb_bytes;
1225         status = done_ccb->ccb_h.status;
1226
1227         if ((status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
1228                 if (scsi_extract_sense_ccb(done_ccb,
1229                     &error_code, &sense_key, &asc, &ascq)) {
1230                         /*
1231                          * If the error is "invalid field in CDB",
1232                          * and the load/eject flag is set, turn the
1233                          * flag off and try again.  This is just in
1234                          * case the drive in question barfs on the
1235                          * load eject flag.  The CAM code should set
1236                          * the load/eject flag by default for
1237                          * removable media.
1238                          */
1239                         if ((scsi_cmd->opcode == START_STOP_UNIT) &&
1240                             ((scsi_cmd->how & SSS_LOEJ) != 0) &&
1241                              (asc == 0x24) && (ascq == 0x00)) {
1242                                 scsi_cmd->how &= ~SSS_LOEJ;
1243                                 if (status & CAM_DEV_QFRZN) {
1244                                         cam_release_devq(done_ccb->ccb_h.path,
1245                                             0, 0, 0, 0);
1246                                         done_ccb->ccb_h.status &=
1247                                             ~CAM_DEV_QFRZN;
1248                                 }
1249                                 xpt_action(done_ccb);
1250                                 goto out;
1251                         }
1252                 }
1253                 if (cam_periph_error(done_ccb,
1254                     0, SF_RETRY_UA | SF_NO_PRINT, NULL) == ERESTART)
1255                         goto out;
1256                 if (done_ccb->ccb_h.status & CAM_DEV_QFRZN) {
1257                         cam_release_devq(done_ccb->ccb_h.path, 0, 0, 0, 0);
1258                         done_ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
1259                 }
1260         } else {
1261                 /*
1262                  * If we have successfully taken a device from the not
1263                  * ready to ready state, re-scan the device and re-get
1264                  * the inquiry information.  Many devices (mostly disks)
1265                  * don't properly report their inquiry information unless
1266                  * they are spun up.
1267                  */
1268                 if (scsi_cmd->opcode == START_STOP_UNIT)
1269                         xpt_async(AC_INQ_CHANGED, done_ccb->ccb_h.path, NULL);
1270         }
1271
1272         /*
1273          * Perform the final retry with the original CCB so that final
1274          * error processing is performed by the owner of the CCB.
1275          */
1276         saved_ccb = (union ccb *)done_ccb->ccb_h.saved_ccb_ptr;
1277         bcopy(saved_ccb, done_ccb, sizeof(*done_ccb));
1278         xpt_free_ccb(saved_ccb);
1279         if (done_ccb->ccb_h.cbfcnp != camperiphdone)
1280                 periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG;
1281         xpt_action(done_ccb);
1282
1283 out:
1284         /* Drop freeze taken due to CAM_DEV_QFREEZE flag set. */
1285         cam_release_devq(done_ccb->ccb_h.path, 0, 0, 0, 0);
1286 }
1287
1288 /*
1289  * Generic Async Event handler.  Peripheral drivers usually
1290  * filter out the events that require personal attention,
1291  * and leave the rest to this function.
1292  */
1293 void
1294 cam_periph_async(struct cam_periph *periph, u_int32_t code,
1295                  struct cam_path *path, void *arg)
1296 {
1297         switch (code) {
1298         case AC_LOST_DEVICE:
1299                 cam_periph_invalidate(periph);
1300                 break;
1301         default:
1302                 break;
1303         }
1304 }
1305
1306 void
1307 cam_periph_bus_settle(struct cam_periph *periph, u_int bus_settle)
1308 {
1309         struct ccb_getdevstats cgds;
1310
1311         xpt_setup_ccb(&cgds.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
1312         cgds.ccb_h.func_code = XPT_GDEV_STATS;
1313         xpt_action((union ccb *)&cgds);
1314         cam_periph_freeze_after_event(periph, &cgds.last_reset, bus_settle);
1315 }
1316
1317 void
1318 cam_periph_freeze_after_event(struct cam_periph *periph,
1319                               struct timeval* event_time, u_int duration_ms)
1320 {
1321         struct timeval delta;
1322         struct timeval duration_tv;
1323
1324         if (!timevalisset(event_time))
1325                 return;
1326
1327         microtime(&delta);
1328         timevalsub(&delta, event_time);
1329         duration_tv.tv_sec = duration_ms / 1000;
1330         duration_tv.tv_usec = (duration_ms % 1000) * 1000;
1331         if (timevalcmp(&delta, &duration_tv, <)) {
1332                 timevalsub(&duration_tv, &delta);
1333
1334                 duration_ms = duration_tv.tv_sec * 1000;
1335                 duration_ms += duration_tv.tv_usec / 1000;
1336                 cam_freeze_devq(periph->path);
1337                 cam_release_devq(periph->path,
1338                                 RELSIM_RELEASE_AFTER_TIMEOUT,
1339                                 /*reduction*/0,
1340                                 /*timeout*/duration_ms,
1341                                 /*getcount_only*/0);
1342         }
1343
1344 }
1345
1346 static int
1347 camperiphscsistatuserror(union ccb *ccb, union ccb **orig_ccb,
1348     cam_flags camflags, u_int32_t sense_flags,
1349     int *openings, u_int32_t *relsim_flags,
1350     u_int32_t *timeout, u_int32_t *action, const char **action_string)
1351 {
1352         int error;
1353
1354         switch (ccb->csio.scsi_status) {
1355         case SCSI_STATUS_OK:
1356         case SCSI_STATUS_COND_MET:
1357         case SCSI_STATUS_INTERMED:
1358         case SCSI_STATUS_INTERMED_COND_MET:
1359                 error = 0;
1360                 break;
1361         case SCSI_STATUS_CMD_TERMINATED:
1362         case SCSI_STATUS_CHECK_COND:
1363                 error = camperiphscsisenseerror(ccb, orig_ccb,
1364                                                 camflags,
1365                                                 sense_flags,
1366                                                 openings,
1367                                                 relsim_flags,
1368                                                 timeout,
1369                                                 action,
1370                                                 action_string);
1371                 break;
1372         case SCSI_STATUS_QUEUE_FULL:
1373         {
1374                 /* no decrement */
1375                 struct ccb_getdevstats cgds;
1376
1377                 /*
1378                  * First off, find out what the current
1379                  * transaction counts are.
1380                  */
1381                 xpt_setup_ccb(&cgds.ccb_h,
1382                               ccb->ccb_h.path,
1383                               CAM_PRIORITY_NORMAL);
1384                 cgds.ccb_h.func_code = XPT_GDEV_STATS;
1385                 xpt_action((union ccb *)&cgds);
1386
1387                 /*
1388                  * If we were the only transaction active, treat
1389                  * the QUEUE FULL as if it were a BUSY condition.
1390                  */
1391                 if (cgds.dev_active != 0) {
1392                         int total_openings;
1393
1394                         /*
1395                          * Reduce the number of openings to
1396                          * be 1 less than the amount it took
1397                          * to get a queue full bounded by the
1398                          * minimum allowed tag count for this
1399                          * device.
1400                          */
1401                         total_openings = cgds.dev_active + cgds.dev_openings;
1402                         *openings = cgds.dev_active;
1403                         if (*openings < cgds.mintags)
1404                                 *openings = cgds.mintags;
1405                         if (*openings < total_openings)
1406                                 *relsim_flags = RELSIM_ADJUST_OPENINGS;
1407                         else {
1408                                 /*
1409                                  * Some devices report queue full for
1410                                  * temporary resource shortages.  For
1411                                  * this reason, we allow a minimum
1412                                  * tag count to be entered via a
1413                                  * quirk entry to prevent the queue
1414                                  * count on these devices from falling
1415                                  * to a pessimisticly low value.  We
1416                                  * still wait for the next successful
1417                                  * completion, however, before queueing
1418                                  * more transactions to the device.
1419                                  */
1420                                 *relsim_flags = RELSIM_RELEASE_AFTER_CMDCMPLT;
1421                         }
1422                         *timeout = 0;
1423                         error = ERESTART;
1424                         *action &= ~SSQ_PRINT_SENSE;
1425                         break;
1426                 }
1427                 /* FALLTHROUGH */
1428         }
1429         case SCSI_STATUS_BUSY:
1430                 /*
1431                  * Restart the queue after either another
1432                  * command completes or a 1 second timeout.
1433                  */
1434                 if ((sense_flags & SF_RETRY_BUSY) != 0 ||
1435                     (ccb->ccb_h.retry_count--) > 0) {
1436                         error = ERESTART;
1437                         *relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT
1438                                       | RELSIM_RELEASE_AFTER_CMDCMPLT;
1439                         *timeout = 1000;
1440                 } else {
1441                         error = EIO;
1442                 }
1443                 break;
1444         case SCSI_STATUS_RESERV_CONFLICT:
1445         default:
1446                 error = EIO;
1447                 break;
1448         }
1449         return (error);
1450 }
1451
1452 static int
1453 camperiphscsisenseerror(union ccb *ccb, union ccb **orig,
1454     cam_flags camflags, u_int32_t sense_flags,
1455     int *openings, u_int32_t *relsim_flags,
1456     u_int32_t *timeout, u_int32_t *action, const char **action_string)
1457 {
1458         struct cam_periph *periph;
1459         union ccb *orig_ccb = ccb;
1460         int error, recoveryccb;
1461
1462 #if defined(BUF_TRACKING) || defined(FULL_BUF_TRACKING)
1463         if (ccb->ccb_h.func_code == XPT_SCSI_IO && ccb->csio.bio != NULL)
1464                 biotrack(ccb->csio.bio, __func__);
1465 #endif
1466
1467         periph = xpt_path_periph(ccb->ccb_h.path);
1468         recoveryccb = (ccb->ccb_h.cbfcnp == camperiphdone);
1469         if ((periph->flags & CAM_PERIPH_RECOVERY_INPROG) && !recoveryccb) {
1470                 /*
1471                  * If error recovery is already in progress, don't attempt
1472                  * to process this error, but requeue it unconditionally
1473                  * and attempt to process it once error recovery has
1474                  * completed.  This failed command is probably related to
1475                  * the error that caused the currently active error recovery
1476                  * action so our  current recovery efforts should also
1477                  * address this command.  Be aware that the error recovery
1478                  * code assumes that only one recovery action is in progress
1479                  * on a particular peripheral instance at any given time
1480                  * (e.g. only one saved CCB for error recovery) so it is
1481                  * imperitive that we don't violate this assumption.
1482                  */
1483                 error = ERESTART;
1484                 *action &= ~SSQ_PRINT_SENSE;
1485         } else {
1486                 scsi_sense_action err_action;
1487                 struct ccb_getdev cgd;
1488
1489                 /*
1490                  * Grab the inquiry data for this device.
1491                  */
1492                 xpt_setup_ccb(&cgd.ccb_h, ccb->ccb_h.path, CAM_PRIORITY_NORMAL);
1493                 cgd.ccb_h.func_code = XPT_GDEV_TYPE;
1494                 xpt_action((union ccb *)&cgd);
1495
1496                 err_action = scsi_error_action(&ccb->csio, &cgd.inq_data,
1497                     sense_flags);
1498                 error = err_action & SS_ERRMASK;
1499
1500                 /*
1501                  * Do not autostart sequential access devices
1502                  * to avoid unexpected tape loading.
1503                  */
1504                 if ((err_action & SS_MASK) == SS_START &&
1505                     SID_TYPE(&cgd.inq_data) == T_SEQUENTIAL) {
1506                         *action_string = "Will not autostart a "
1507                             "sequential access device";
1508                         goto sense_error_done;
1509                 }
1510
1511                 /*
1512                  * Avoid recovery recursion if recovery action is the same.
1513                  */
1514                 if ((err_action & SS_MASK) >= SS_START && recoveryccb) {
1515                         if (((err_action & SS_MASK) == SS_START &&
1516                              ccb->csio.cdb_io.cdb_bytes[0] == START_STOP_UNIT) ||
1517                             ((err_action & SS_MASK) == SS_TUR &&
1518                              (ccb->csio.cdb_io.cdb_bytes[0] == TEST_UNIT_READY))) {
1519                                 err_action = SS_RETRY|SSQ_DECREMENT_COUNT|EIO;
1520                                 *relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
1521                                 *timeout = 500;
1522                         }
1523                 }
1524
1525                 /*
1526                  * If the recovery action will consume a retry,
1527                  * make sure we actually have retries available.
1528                  */
1529                 if ((err_action & SSQ_DECREMENT_COUNT) != 0) {
1530                         if (ccb->ccb_h.retry_count > 0 &&
1531                             (periph->flags & CAM_PERIPH_INVALID) == 0)
1532                                 ccb->ccb_h.retry_count--;
1533                         else {
1534                                 *action_string = "Retries exhausted";
1535                                 goto sense_error_done;
1536                         }
1537                 }
1538
1539                 if ((err_action & SS_MASK) >= SS_START) {
1540                         /*
1541                          * Do common portions of commands that
1542                          * use recovery CCBs.
1543                          */
1544                         orig_ccb = xpt_alloc_ccb_nowait();
1545                         if (orig_ccb == NULL) {
1546                                 *action_string = "Can't allocate recovery CCB";
1547                                 goto sense_error_done;
1548                         }
1549                         /*
1550                          * Clear freeze flag for original request here, as
1551                          * this freeze will be dropped as part of ERESTART.
1552                          */
1553                         ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
1554                         bcopy(ccb, orig_ccb, sizeof(*orig_ccb));
1555                 }
1556
1557                 switch (err_action & SS_MASK) {
1558                 case SS_NOP:
1559                         *action_string = "No recovery action needed";
1560                         error = 0;
1561                         break;
1562                 case SS_RETRY:
1563                         *action_string = "Retrying command (per sense data)";
1564                         error = ERESTART;
1565                         break;
1566                 case SS_FAIL:
1567                         *action_string = "Unretryable error";
1568                         break;
1569                 case SS_START:
1570                 {
1571                         int le;
1572
1573                         /*
1574                          * Send a start unit command to the device, and
1575                          * then retry the command.
1576                          */
1577                         *action_string = "Attempting to start unit";
1578                         periph->flags |= CAM_PERIPH_RECOVERY_INPROG;
1579
1580                         /*
1581                          * Check for removable media and set
1582                          * load/eject flag appropriately.
1583                          */
1584                         if (SID_IS_REMOVABLE(&cgd.inq_data))
1585                                 le = TRUE;
1586                         else
1587                                 le = FALSE;
1588
1589                         scsi_start_stop(&ccb->csio,
1590                                         /*retries*/1,
1591                                         camperiphdone,
1592                                         MSG_SIMPLE_Q_TAG,
1593                                         /*start*/TRUE,
1594                                         /*load/eject*/le,
1595                                         /*immediate*/FALSE,
1596                                         SSD_FULL_SIZE,
1597                                         /*timeout*/50000);
1598                         break;
1599                 }
1600                 case SS_TUR:
1601                 {
1602                         /*
1603                          * Send a Test Unit Ready to the device.
1604                          * If the 'many' flag is set, we send 120
1605                          * test unit ready commands, one every half
1606                          * second.  Otherwise, we just send one TUR.
1607                          * We only want to do this if the retry
1608                          * count has not been exhausted.
1609                          */
1610                         int retries;
1611
1612                         if ((err_action & SSQ_MANY) != 0) {
1613                                 *action_string = "Polling device for readiness";
1614                                 retries = 120;
1615                         } else {
1616                                 *action_string = "Testing device for readiness";
1617                                 retries = 1;
1618                         }
1619                         periph->flags |= CAM_PERIPH_RECOVERY_INPROG;
1620                         scsi_test_unit_ready(&ccb->csio,
1621                                              retries,
1622                                              camperiphdone,
1623                                              MSG_SIMPLE_Q_TAG,
1624                                              SSD_FULL_SIZE,
1625                                              /*timeout*/5000);
1626
1627                         /*
1628                          * Accomplish our 500ms delay by deferring
1629                          * the release of our device queue appropriately.
1630                          */
1631                         *relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
1632                         *timeout = 500;
1633                         break;
1634                 }
1635                 default:
1636                         panic("Unhandled error action %x", err_action);
1637                 }
1638
1639                 if ((err_action & SS_MASK) >= SS_START) {
1640                         /*
1641                          * Drop the priority, so that the recovery
1642                          * CCB is the first to execute.  Freeze the queue
1643                          * after this command is sent so that we can
1644                          * restore the old csio and have it queued in
1645                          * the proper order before we release normal
1646                          * transactions to the device.
1647                          */
1648                         ccb->ccb_h.pinfo.priority--;
1649                         ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
1650                         ccb->ccb_h.saved_ccb_ptr = orig_ccb;
1651                         error = ERESTART;
1652                         *orig = orig_ccb;
1653                 }
1654
1655 sense_error_done:
1656                 *action = err_action;
1657         }
1658         return (error);
1659 }
1660
1661 /*
1662  * Generic error handler.  Peripheral drivers usually filter
1663  * out the errors that they handle in a unique manner, then
1664  * call this function.
1665  */
1666 int
1667 cam_periph_error(union ccb *ccb, cam_flags camflags,
1668                  u_int32_t sense_flags, union ccb *save_ccb)
1669 {
1670         struct cam_path *newpath;
1671         union ccb  *orig_ccb, *scan_ccb;
1672         struct cam_periph *periph;
1673         const char *action_string;
1674         cam_status  status;
1675         int         frozen, error, openings, devctl_err;
1676         u_int32_t   action, relsim_flags, timeout;
1677
1678         action = SSQ_PRINT_SENSE;
1679         periph = xpt_path_periph(ccb->ccb_h.path);
1680         action_string = NULL;
1681         status = ccb->ccb_h.status;
1682         frozen = (status & CAM_DEV_QFRZN) != 0;
1683         status &= CAM_STATUS_MASK;
1684         devctl_err = openings = relsim_flags = timeout = 0;
1685         orig_ccb = ccb;
1686
1687         /* Filter the errors that should be reported via devctl */
1688         switch (ccb->ccb_h.status & CAM_STATUS_MASK) {
1689         case CAM_CMD_TIMEOUT:
1690         case CAM_REQ_ABORTED:
1691         case CAM_REQ_CMP_ERR:
1692         case CAM_REQ_TERMIO:
1693         case CAM_UNREC_HBA_ERROR:
1694         case CAM_DATA_RUN_ERR:
1695         case CAM_SCSI_STATUS_ERROR:
1696         case CAM_ATA_STATUS_ERROR:
1697         case CAM_SMP_STATUS_ERROR:
1698                 devctl_err++;
1699                 break;
1700         default:
1701                 break;
1702         }
1703
1704         switch (status) {
1705         case CAM_REQ_CMP:
1706                 error = 0;
1707                 action &= ~SSQ_PRINT_SENSE;
1708                 break;
1709         case CAM_SCSI_STATUS_ERROR:
1710                 error = camperiphscsistatuserror(ccb, &orig_ccb,
1711                     camflags, sense_flags, &openings, &relsim_flags,
1712                     &timeout, &action, &action_string);
1713                 break;
1714         case CAM_AUTOSENSE_FAIL:
1715                 error = EIO;    /* we have to kill the command */
1716                 break;
1717         case CAM_UA_ABORT:
1718         case CAM_UA_TERMIO:
1719         case CAM_MSG_REJECT_REC:
1720                 /* XXX Don't know that these are correct */
1721                 error = EIO;
1722                 break;
1723         case CAM_SEL_TIMEOUT:
1724                 if ((camflags & CAM_RETRY_SELTO) != 0) {
1725                         if (ccb->ccb_h.retry_count > 0 &&
1726                             (periph->flags & CAM_PERIPH_INVALID) == 0) {
1727                                 ccb->ccb_h.retry_count--;
1728                                 error = ERESTART;
1729
1730                                 /*
1731                                  * Wait a bit to give the device
1732                                  * time to recover before we try again.
1733                                  */
1734                                 relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
1735                                 timeout = periph_selto_delay;
1736                                 break;
1737                         }
1738                         action_string = "Retries exhausted";
1739                 }
1740                 /* FALLTHROUGH */
1741         case CAM_DEV_NOT_THERE:
1742                 error = ENXIO;
1743                 action = SSQ_LOST;
1744                 break;
1745         case CAM_REQ_INVALID:
1746         case CAM_PATH_INVALID:
1747         case CAM_NO_HBA:
1748         case CAM_PROVIDE_FAIL:
1749         case CAM_REQ_TOO_BIG:
1750         case CAM_LUN_INVALID:
1751         case CAM_TID_INVALID:
1752         case CAM_FUNC_NOTAVAIL:
1753                 error = EINVAL;
1754                 break;
1755         case CAM_SCSI_BUS_RESET:
1756         case CAM_BDR_SENT:
1757                 /*
1758                  * Commands that repeatedly timeout and cause these
1759                  * kinds of error recovery actions, should return
1760                  * CAM_CMD_TIMEOUT, which allows us to safely assume
1761                  * that this command was an innocent bystander to
1762                  * these events and should be unconditionally
1763                  * retried.
1764                  */
1765         case CAM_REQUEUE_REQ:
1766                 /* Unconditional requeue if device is still there */
1767                 if (periph->flags & CAM_PERIPH_INVALID) {
1768                         action_string = "Periph was invalidated";
1769                         error = EIO;
1770                 } else if (sense_flags & SF_NO_RETRY) {
1771                         error = EIO;
1772                         action_string = "Retry was blocked";
1773                 } else {
1774                         error = ERESTART;
1775                         action &= ~SSQ_PRINT_SENSE;
1776                 }
1777                 break;
1778         case CAM_RESRC_UNAVAIL:
1779                 /* Wait a bit for the resource shortage to abate. */
1780                 timeout = periph_noresrc_delay;
1781                 /* FALLTHROUGH */
1782         case CAM_BUSY:
1783                 if (timeout == 0) {
1784                         /* Wait a bit for the busy condition to abate. */
1785                         timeout = periph_busy_delay;
1786                 }
1787                 relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
1788                 /* FALLTHROUGH */
1789         case CAM_ATA_STATUS_ERROR:
1790         case CAM_REQ_CMP_ERR:
1791         case CAM_CMD_TIMEOUT:
1792         case CAM_UNEXP_BUSFREE:
1793         case CAM_UNCOR_PARITY:
1794         case CAM_DATA_RUN_ERR:
1795         default:
1796                 if (periph->flags & CAM_PERIPH_INVALID) {
1797                         error = EIO;
1798                         action_string = "Periph was invalidated";
1799                 } else if (ccb->ccb_h.retry_count == 0) {
1800                         error = EIO;
1801                         action_string = "Retries exhausted";
1802                 } else if (sense_flags & SF_NO_RETRY) {
1803                         error = EIO;
1804                         action_string = "Retry was blocked";
1805                 } else {
1806                         ccb->ccb_h.retry_count--;
1807                         error = ERESTART;
1808                 }
1809                 break;
1810         }
1811
1812         if ((sense_flags & SF_PRINT_ALWAYS) ||
1813             CAM_DEBUGGED(ccb->ccb_h.path, CAM_DEBUG_INFO))
1814                 action |= SSQ_PRINT_SENSE;
1815         else if (sense_flags & SF_NO_PRINT)
1816                 action &= ~SSQ_PRINT_SENSE;
1817         if ((action & SSQ_PRINT_SENSE) != 0)
1818                 cam_error_print(orig_ccb, CAM_ESF_ALL, CAM_EPF_ALL);
1819         if (error != 0 && (action & SSQ_PRINT_SENSE) != 0) {
1820                 if (error != ERESTART) {
1821                         if (action_string == NULL)
1822                                 action_string = "Unretryable error";
1823                         xpt_print(ccb->ccb_h.path, "Error %d, %s\n",
1824                             error, action_string);
1825                 } else if (action_string != NULL)
1826                         xpt_print(ccb->ccb_h.path, "%s\n", action_string);
1827                 else
1828                         xpt_print(ccb->ccb_h.path, "Retrying command\n");
1829         }
1830
1831         if (devctl_err && (error != 0 || (action & SSQ_PRINT_SENSE) != 0))
1832                 cam_periph_devctl_notify(orig_ccb);
1833
1834         if ((action & SSQ_LOST) != 0) {
1835                 lun_id_t lun_id;
1836
1837                 /*
1838                  * For a selection timeout, we consider all of the LUNs on
1839                  * the target to be gone.  If the status is CAM_DEV_NOT_THERE,
1840                  * then we only get rid of the device(s) specified by the
1841                  * path in the original CCB.
1842                  */
1843                 if (status == CAM_SEL_TIMEOUT)
1844                         lun_id = CAM_LUN_WILDCARD;
1845                 else
1846                         lun_id = xpt_path_lun_id(ccb->ccb_h.path);
1847
1848                 /* Should we do more if we can't create the path?? */
1849                 if (xpt_create_path(&newpath, periph,
1850                                     xpt_path_path_id(ccb->ccb_h.path),
1851                                     xpt_path_target_id(ccb->ccb_h.path),
1852                                     lun_id) == CAM_REQ_CMP) {
1853
1854                         /*
1855                          * Let peripheral drivers know that this
1856                          * device has gone away.
1857                          */
1858                         xpt_async(AC_LOST_DEVICE, newpath, NULL);
1859                         xpt_free_path(newpath);
1860                 }
1861         }
1862
1863         /* Broadcast UNIT ATTENTIONs to all periphs. */
1864         if ((action & SSQ_UA) != 0)
1865                 xpt_async(AC_UNIT_ATTENTION, orig_ccb->ccb_h.path, orig_ccb);
1866
1867         /* Rescan target on "Reported LUNs data has changed" */
1868         if ((action & SSQ_RESCAN) != 0) {
1869                 if (xpt_create_path(&newpath, NULL,
1870                                     xpt_path_path_id(ccb->ccb_h.path),
1871                                     xpt_path_target_id(ccb->ccb_h.path),
1872                                     CAM_LUN_WILDCARD) == CAM_REQ_CMP) {
1873
1874                         scan_ccb = xpt_alloc_ccb_nowait();
1875                         if (scan_ccb != NULL) {
1876                                 scan_ccb->ccb_h.path = newpath;
1877                                 scan_ccb->ccb_h.func_code = XPT_SCAN_TGT;
1878                                 scan_ccb->crcn.flags = 0;
1879                                 xpt_rescan(scan_ccb);
1880                         } else {
1881                                 xpt_print(newpath,
1882                                     "Can't allocate CCB to rescan target\n");
1883                                 xpt_free_path(newpath);
1884                         }
1885                 }
1886         }
1887
1888         /* Attempt a retry */
1889         if (error == ERESTART || error == 0) {
1890                 if (frozen != 0)
1891                         ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
1892                 if (error == ERESTART)
1893                         xpt_action(ccb);
1894                 if (frozen != 0)
1895                         cam_release_devq(ccb->ccb_h.path,
1896                                          relsim_flags,
1897                                          openings,
1898                                          timeout,
1899                                          /*getcount_only*/0);
1900         }
1901
1902         return (error);
1903 }
1904
1905 #define CAM_PERIPH_DEVD_MSG_SIZE        256
1906
1907 static void
1908 cam_periph_devctl_notify(union ccb *ccb)
1909 {
1910         struct cam_periph *periph;
1911         struct ccb_getdev *cgd;
1912         struct sbuf sb;
1913         int serr, sk, asc, ascq;
1914         char *sbmsg, *type;
1915
1916         sbmsg = malloc(CAM_PERIPH_DEVD_MSG_SIZE, M_CAMPERIPH, M_NOWAIT);
1917         if (sbmsg == NULL)
1918                 return;
1919
1920         sbuf_new(&sb, sbmsg, CAM_PERIPH_DEVD_MSG_SIZE, SBUF_FIXEDLEN);
1921
1922         periph = xpt_path_periph(ccb->ccb_h.path);
1923         sbuf_printf(&sb, "device=%s%d ", periph->periph_name,
1924             periph->unit_number);
1925
1926         sbuf_printf(&sb, "serial=\"");
1927         if ((cgd = (struct ccb_getdev *)xpt_alloc_ccb_nowait()) != NULL) {
1928                 xpt_setup_ccb(&cgd->ccb_h, ccb->ccb_h.path,
1929                     CAM_PRIORITY_NORMAL);
1930                 cgd->ccb_h.func_code = XPT_GDEV_TYPE;
1931                 xpt_action((union ccb *)cgd);
1932
1933                 if (cgd->ccb_h.status == CAM_REQ_CMP)
1934                         sbuf_bcat(&sb, cgd->serial_num, cgd->serial_num_len);
1935                 xpt_free_ccb((union ccb *)cgd);
1936         }
1937         sbuf_printf(&sb, "\" ");
1938         sbuf_printf(&sb, "cam_status=\"0x%x\" ", ccb->ccb_h.status);
1939
1940         switch (ccb->ccb_h.status & CAM_STATUS_MASK) {
1941         case CAM_CMD_TIMEOUT:
1942                 sbuf_printf(&sb, "timeout=%d ", ccb->ccb_h.timeout);
1943                 type = "timeout";
1944                 break;
1945         case CAM_SCSI_STATUS_ERROR:
1946                 sbuf_printf(&sb, "scsi_status=%d ", ccb->csio.scsi_status);
1947                 if (scsi_extract_sense_ccb(ccb, &serr, &sk, &asc, &ascq))
1948                         sbuf_printf(&sb, "scsi_sense=\"%02x %02x %02x %02x\" ",
1949                             serr, sk, asc, ascq);
1950                 type = "error";
1951                 break;
1952         case CAM_ATA_STATUS_ERROR:
1953                 sbuf_printf(&sb, "RES=\"");
1954                 ata_res_sbuf(&ccb->ataio.res, &sb);
1955                 sbuf_printf(&sb, "\" ");
1956                 type = "error";
1957                 break;
1958         default:
1959                 type = "error";
1960                 break;
1961         }
1962
1963         if (ccb->ccb_h.func_code == XPT_SCSI_IO) {
1964                 sbuf_printf(&sb, "CDB=\"");
1965                 scsi_cdb_sbuf(scsiio_cdb_ptr(&ccb->csio), &sb);
1966                 sbuf_printf(&sb, "\" ");
1967         } else if (ccb->ccb_h.func_code == XPT_ATA_IO) {
1968                 sbuf_printf(&sb, "ACB=\"");
1969                 ata_cmd_sbuf(&ccb->ataio.cmd, &sb);
1970                 sbuf_printf(&sb, "\" ");
1971         }
1972
1973         if (sbuf_finish(&sb) == 0)
1974                 devctl_notify("CAM", "periph", type, sbuf_data(&sb));
1975         sbuf_delete(&sb);
1976         free(sbmsg, M_CAMPERIPH);
1977 }
1978