sys/cam/cam_periph.c

   1 /*-
   2  * Common functions for CAM "type" (peripheral) drivers.
   3  *
   4  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   5  *
   6  * Copyright (c) 1997, 1998 Justin T. Gibbs.
   7  * Copyright (c) 1997, 1998, 1999, 2000 Kenneth D. Merry.
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions, and the following disclaimer,
  15  *    without modification, immediately at the beginning of the file.
  16  * 2. The name of the author may not be used to endorse or promote products
  17  *    derived from this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  23  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __FBSDID("$FreeBSD$");
  34
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/types.h>
  38 #include <sys/malloc.h>
  39 #include <sys/kernel.h>
  40 #include <sys/bio.h>
  41 #include <sys/conf.h>
  42 #include <sys/devctl.h>
  43 #include <sys/lock.h>
  44 #include <sys/mutex.h>
  45 #include <sys/buf.h>
  46 #include <sys/proc.h>
  47 #include <sys/devicestat.h>
  48 #include <sys/sbuf.h>
  49 #include <sys/sysctl.h>
  50 #include <vm/vm.h>
  51 #include <vm/vm_extern.h>
  52
  53 #include <cam/cam.h>
  54 #include <cam/cam_ccb.h>
  55 #include <cam/cam_queue.h>
  56 #include <cam/cam_xpt_periph.h>
  57 #include <cam/cam_xpt_internal.h>
  58 #include <cam/cam_periph.h>
  59 #include <cam/cam_debug.h>
  60 #include <cam/cam_sim.h>
  61
  62 #include <cam/scsi/scsi_all.h>
  63 #include <cam/scsi/scsi_message.h>
  64 #include <cam/scsi/scsi_pass.h>
  65
  66 static  u_int           camperiphnextunit(struct periph_driver *p_drv,
  67                                           u_int newunit, int wired,
  68                                           path_id_t pathid, target_id_t target,
  69                                           lun_id_t lun);
  70 static  u_int           camperiphunit(struct periph_driver *p_drv,
  71                                       path_id_t pathid, target_id_t target,
  72                                       lun_id_t lun);
  73 static  void            camperiphdone(struct cam_periph *periph,
  74                                         union ccb *done_ccb);
  75 static  void            camperiphfree(struct cam_periph *periph);
  76 static int              camperiphscsistatuserror(union ccb *ccb,
  77                                                 union ccb **orig_ccb,
  78                                                  cam_flags camflags,
  79                                                  u_int32_t sense_flags,
  80                                                  int *openings,
  81                                                  u_int32_t *relsim_flags,
  82                                                  u_int32_t *timeout,
  83                                                  u_int32_t  *action,
  84                                                  const char **action_string);
  85 static  int             camperiphscsisenseerror(union ccb *ccb,
  86                                                 union ccb **orig_ccb,
  87                                                 cam_flags camflags,
  88                                                 u_int32_t sense_flags,
  89                                                 int *openings,
  90                                                 u_int32_t *relsim_flags,
  91                                                 u_int32_t *timeout,
  92                                                 u_int32_t *action,
  93                                                 const char **action_string);
  94 static void             cam_periph_devctl_notify(union ccb *ccb);
  95
  96 static int nperiph_drivers;
  97 static int initialized = 0;
  98 struct periph_driver **periph_drivers;
  99
 100 static MALLOC_DEFINE(M_CAMPERIPH, "CAM periph", "CAM peripheral buffers");
 101
 102 static int periph_selto_delay = 1000;
 103 TUNABLE_INT("kern.cam.periph_selto_delay", &periph_selto_delay);
 104 static int periph_noresrc_delay = 500;
 105 TUNABLE_INT("kern.cam.periph_noresrc_delay", &periph_noresrc_delay);
 106 static int periph_busy_delay = 500;
 107 TUNABLE_INT("kern.cam.periph_busy_delay", &periph_busy_delay);
 108
 109 static u_int periph_mapmem_thresh = 65536;
 110 SYSCTL_UINT(_kern_cam, OID_AUTO, mapmem_thresh, CTLFLAG_RWTUN,
 111     &periph_mapmem_thresh, 0, "Threshold for user-space buffer mapping");
 112
 113 void
 114 periphdriver_register(void *data)
 115 {
 116         struct periph_driver *drv = (struct periph_driver *)data;
 117         struct periph_driver **newdrivers, **old;
 118         int ndrivers;
 119
 120 again:
 121         ndrivers = nperiph_drivers + 2;
 122         newdrivers = malloc(sizeof(*newdrivers) * ndrivers, M_CAMPERIPH,
 123                             M_WAITOK);
 124         xpt_lock_buses();
 125         if (ndrivers != nperiph_drivers + 2) {
 126                 /*
 127                  * Lost race against itself; go around.
 128                  */
 129                 xpt_unlock_buses();
 130                 free(newdrivers, M_CAMPERIPH);
 131                 goto again;
 132         }
 133         if (periph_drivers)
 134                 bcopy(periph_drivers, newdrivers,
 135                       sizeof(*newdrivers) * nperiph_drivers);
 136         newdrivers[nperiph_drivers] = drv;
 137         newdrivers[nperiph_drivers + 1] = NULL;
 138         old = periph_drivers;
 139         periph_drivers = newdrivers;
 140         nperiph_drivers++;
 141         xpt_unlock_buses();
 142         if (old)
 143                 free(old, M_CAMPERIPH);
 144         /* If driver marked as early or it is late now, initialize it. */
 145         if (((drv->flags & CAM_PERIPH_DRV_EARLY) != 0 && initialized > 0) ||
 146             initialized > 1)
 147                 (*drv->init)();
 148 }
 149
 150 int
 151 periphdriver_unregister(void *data)
 152 {
 153         struct periph_driver *drv = (struct periph_driver *)data;
 154         int error, n;
 155
 156         /* If driver marked as early or it is late now, deinitialize it. */
 157         if (((drv->flags & CAM_PERIPH_DRV_EARLY) != 0 && initialized > 0) ||
 158             initialized > 1) {
 159                 if (drv->deinit == NULL) {
 160                         printf("CAM periph driver '%s' doesn't have deinit.\n",
 161                             drv->driver_name);
 162                         return (EOPNOTSUPP);
 163                 }
 164                 error = drv->deinit();
 165                 if (error != 0)
 166                         return (error);
 167         }
 168
 169         xpt_lock_buses();
 170         for (n = 0; n < nperiph_drivers && periph_drivers[n] != drv; n++)
 171                 ;
 172         KASSERT(n < nperiph_drivers,
 173             ("Periph driver '%s' was not registered", drv->driver_name));
 174         for (; n + 1 < nperiph_drivers; n++)
 175                 periph_drivers[n] = periph_drivers[n + 1];
 176         periph_drivers[n + 1] = NULL;
 177         nperiph_drivers--;
 178         xpt_unlock_buses();
 179         return (0);
 180 }
 181
 182 void
 183 periphdriver_init(int level)
 184 {
 185         int     i, early;
 186
 187         initialized = max(initialized, level);
 188         for (i = 0; periph_drivers[i] != NULL; i++) {
 189                 early = (periph_drivers[i]->flags & CAM_PERIPH_DRV_EARLY) ? 1 : 2;
 190                 if (early == initialized)
 191                         (*periph_drivers[i]->init)();
 192         }
 193 }
 194
 195 cam_status
 196 cam_periph_alloc(periph_ctor_t *periph_ctor,
 197                  periph_oninv_t *periph_oninvalidate,
 198                  periph_dtor_t *periph_dtor, periph_start_t *periph_start,
 199                  char *name, cam_periph_type type, struct cam_path *path,
 200                  ac_callback_t *ac_callback, ac_code code, void *arg)
 201 {
 202         struct          periph_driver **p_drv;
 203         struct          cam_sim *sim;
 204         struct          cam_periph *periph;
 205         struct          cam_periph *cur_periph;
 206         path_id_t       path_id;
 207         target_id_t     target_id;
 208         lun_id_t        lun_id;
 209         cam_status      status;
 210         u_int           init_level;
 211
 212         init_level = 0;
 213         /*
 214          * Handle Hot-Plug scenarios.  If there is already a peripheral
 215          * of our type assigned to this path, we are likely waiting for
 216          * final close on an old, invalidated, peripheral.  If this is
 217          * the case, queue up a deferred call to the peripheral's async
 218          * handler.  If it looks like a mistaken re-allocation, complain.
 219          */
 220         if ((periph = cam_periph_find(path, name)) != NULL) {
 221                 if ((periph->flags & CAM_PERIPH_INVALID) != 0
 222                  && (periph->flags & CAM_PERIPH_NEW_DEV_FOUND) == 0) {
 223                         periph->flags |= CAM_PERIPH_NEW_DEV_FOUND;
 224                         periph->deferred_callback = ac_callback;
 225                         periph->deferred_ac = code;
 226                         return (CAM_REQ_INPROG);
 227                 } else {
 228                         printf("cam_periph_alloc: attempt to re-allocate "
 229                                "valid device %s%d rejected flags %#x "
 230                                "refcount %d\n", periph->periph_name,
 231                                periph->unit_number, periph->flags,
 232                                periph->refcount);
 233                 }
 234                 return (CAM_REQ_INVALID);
 235         }
 236
 237         periph = (struct cam_periph *)malloc(sizeof(*periph), M_CAMPERIPH,
 238                                              M_NOWAIT|M_ZERO);
 239
 240         if (periph == NULL)
 241                 return (CAM_RESRC_UNAVAIL);
 242
 243         init_level++;
 244
 245         sim = xpt_path_sim(path);
 246         path_id = xpt_path_path_id(path);
 247         target_id = xpt_path_target_id(path);
 248         lun_id = xpt_path_lun_id(path);
 249         periph->periph_start = periph_start;
 250         periph->periph_dtor = periph_dtor;
 251         periph->periph_oninval = periph_oninvalidate;
 252         periph->type = type;
 253         periph->periph_name = name;
 254         periph->scheduled_priority = CAM_PRIORITY_NONE;
 255         periph->immediate_priority = CAM_PRIORITY_NONE;
 256         periph->refcount = 1;           /* Dropped by invalidation. */
 257         periph->sim = sim;
 258         SLIST_INIT(&periph->ccb_list);
 259         status = xpt_create_path(&path, periph, path_id, target_id, lun_id);
 260         if (status != CAM_REQ_CMP)
 261                 goto failure;
 262         periph->path = path;
 263
 264         xpt_lock_buses();
 265         for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
 266                 if (strcmp((*p_drv)->driver_name, name) == 0)
 267                         break;
 268         }
 269         if (*p_drv == NULL) {
 270                 printf("cam_periph_alloc: invalid periph name '%s'\n", name);
 271                 xpt_unlock_buses();
 272                 xpt_free_path(periph->path);
 273                 free(periph, M_CAMPERIPH);
 274                 return (CAM_REQ_INVALID);
 275         }
 276         periph->unit_number = camperiphunit(*p_drv, path_id, target_id, lun_id);
 277         cur_periph = TAILQ_FIRST(&(*p_drv)->units);
 278         while (cur_periph != NULL
 279             && cur_periph->unit_number < periph->unit_number)
 280                 cur_periph = TAILQ_NEXT(cur_periph, unit_links);
 281         if (cur_periph != NULL) {
 282                 KASSERT(cur_periph->unit_number != periph->unit_number,
 283                     ("duplicate units on periph list"));
 284                 TAILQ_INSERT_BEFORE(cur_periph, periph, unit_links);
 285         } else {
 286                 TAILQ_INSERT_TAIL(&(*p_drv)->units, periph, unit_links);
 287                 (*p_drv)->generation++;
 288         }
 289         xpt_unlock_buses();
 290
 291         init_level++;
 292
 293         status = xpt_add_periph(periph);
 294         if (status != CAM_REQ_CMP)
 295                 goto failure;
 296
 297         init_level++;
 298         CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph created\n"));
 299
 300         status = periph_ctor(periph, arg);
 301
 302         if (status == CAM_REQ_CMP)
 303                 init_level++;
 304
 305 failure:
 306         switch (init_level) {
 307         case 4:
 308                 /* Initialized successfully */
 309                 break;
 310         case 3:
 311                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph destroyed\n"));
 312                 xpt_remove_periph(periph);
 313                 /* FALLTHROUGH */
 314         case 2:
 315                 xpt_lock_buses();
 316                 TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links);
 317                 xpt_unlock_buses();
 318                 xpt_free_path(periph->path);
 319                 /* FALLTHROUGH */
 320         case 1:
 321                 free(periph, M_CAMPERIPH);
 322                 /* FALLTHROUGH */
 323         case 0:
 324                 /* No cleanup to perform. */
 325                 break;
 326         default:
 327                 panic("%s: Unknown init level", __func__);
 328         }
 329         return(status);
 330 }
 331
 332 /*
 333  * Find a peripheral structure with the specified path, target, lun,
 334  * and (optionally) type.  If the name is NULL, this function will return
 335  * the first peripheral driver that matches the specified path.
 336  */
 337 struct cam_periph *
 338 cam_periph_find(struct cam_path *path, char *name)
 339 {
 340         struct periph_driver **p_drv;
 341         struct cam_periph *periph;
 342
 343         xpt_lock_buses();
 344         for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
 345                 if (name != NULL && (strcmp((*p_drv)->driver_name, name) != 0))
 346                         continue;
 347
 348                 TAILQ_FOREACH(periph, &(*p_drv)->units, unit_links) {
 349                         if (xpt_path_comp(periph->path, path) == 0) {
 350                                 xpt_unlock_buses();
 351                                 cam_periph_assert(periph, MA_OWNED);
 352                                 return(periph);
 353                         }
 354                 }
 355                 if (name != NULL) {
 356                         xpt_unlock_buses();
 357                         return(NULL);
 358                 }
 359         }
 360         xpt_unlock_buses();
 361         return(NULL);
 362 }
 363
 364 /*
 365  * Find peripheral driver instances attached to the specified path.
 366  */
 367 int
 368 cam_periph_list(struct cam_path *path, struct sbuf *sb)
 369 {
 370         struct sbuf local_sb;
 371         struct periph_driver **p_drv;
 372         struct cam_periph *periph;
 373         int count;
 374         int sbuf_alloc_len;
 375
 376         sbuf_alloc_len = 16;
 377 retry:
 378         sbuf_new(&local_sb, NULL, sbuf_alloc_len, SBUF_FIXEDLEN);
 379         count = 0;
 380         xpt_lock_buses();
 381         for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
 382                 TAILQ_FOREACH(periph, &(*p_drv)->units, unit_links) {
 383                         if (xpt_path_comp(periph->path, path) != 0)
 384                                 continue;
 385
 386                         if (sbuf_len(&local_sb) != 0)
 387                                 sbuf_cat(&local_sb, ",");
 388
 389                         sbuf_printf(&local_sb, "%s%d", periph->periph_name,
 390                                     periph->unit_number);
 391
 392                         if (sbuf_error(&local_sb) == ENOMEM) {
 393                                 sbuf_alloc_len *= 2;
 394                                 xpt_unlock_buses();
 395                                 sbuf_delete(&local_sb);
 396                                 goto retry;
 397                         }
 398                         count++;
 399                 }
 400         }
 401         xpt_unlock_buses();
 402         sbuf_finish(&local_sb);
 403         if (sbuf_len(sb) != 0)
 404                 sbuf_cat(sb, ",");
 405         sbuf_cat(sb, sbuf_data(&local_sb));
 406         sbuf_delete(&local_sb);
 407         return (count);
 408 }
 409
 410 int
 411 cam_periph_acquire(struct cam_periph *periph)
 412 {
 413         int status;
 414
 415         if (periph == NULL)
 416                 return (EINVAL);
 417
 418         status = ENOENT;
 419         xpt_lock_buses();
 420         if ((periph->flags & CAM_PERIPH_INVALID) == 0) {
 421                 periph->refcount++;
 422                 status = 0;
 423         }
 424         xpt_unlock_buses();
 425
 426         return (status);
 427 }
 428
 429 void
 430 cam_periph_doacquire(struct cam_periph *periph)
 431 {
 432
 433         xpt_lock_buses();
 434         KASSERT(periph->refcount >= 1,
 435             ("cam_periph_doacquire() with refcount == %d", periph->refcount));
 436         periph->refcount++;
 437         xpt_unlock_buses();
 438 }
 439
 440 void
 441 cam_periph_release_locked_buses(struct cam_periph *periph)
 442 {
 443
 444         cam_periph_assert(periph, MA_OWNED);
 445         KASSERT(periph->refcount >= 1, ("periph->refcount >= 1"));
 446         if (--periph->refcount == 0)
 447                 camperiphfree(periph);
 448 }
 449
 450 void
 451 cam_periph_release_locked(struct cam_periph *periph)
 452 {
 453
 454         if (periph == NULL)
 455                 return;
 456
 457         xpt_lock_buses();
 458         cam_periph_release_locked_buses(periph);
 459         xpt_unlock_buses();
 460 }
 461
 462 void
 463 cam_periph_release(struct cam_periph *periph)
 464 {
 465         struct mtx *mtx;
 466
 467         if (periph == NULL)
 468                 return;
 469
 470         cam_periph_assert(periph, MA_NOTOWNED);
 471         mtx = cam_periph_mtx(periph);
 472         mtx_lock(mtx);
 473         cam_periph_release_locked(periph);
 474         mtx_unlock(mtx);
 475 }
 476
 477 /*
 478  * hold/unhold act as mutual exclusion for sections of the code that
 479  * need to sleep and want to make sure that other sections that
 480  * will interfere are held off. This only protects exclusive sections
 481  * from each other.
 482  */
 483 int
 484 cam_periph_hold(struct cam_periph *periph, int priority)
 485 {
 486         int error;
 487
 488         /*
 489          * Increment the reference count on the peripheral
 490          * while we wait for our lock attempt to succeed
 491          * to ensure the peripheral doesn't disappear out
 492          * from user us while we sleep.
 493          */
 494
 495         if (cam_periph_acquire(periph) != 0)
 496                 return (ENXIO);
 497
 498         cam_periph_assert(periph, MA_OWNED);
 499         while ((periph->flags & CAM_PERIPH_LOCKED) != 0) {
 500                 periph->flags |= CAM_PERIPH_LOCK_WANTED;
 501                 if ((error = cam_periph_sleep(periph, periph, priority,
 502                     "caplck", 0)) != 0) {
 503                         cam_periph_release_locked(periph);
 504                         return (error);
 505                 }
 506                 if (periph->flags & CAM_PERIPH_INVALID) {
 507                         cam_periph_release_locked(periph);
 508                         return (ENXIO);
 509                 }
 510         }
 511
 512         periph->flags |= CAM_PERIPH_LOCKED;
 513         return (0);
 514 }
 515
 516 void
 517 cam_periph_unhold(struct cam_periph *periph)
 518 {
 519
 520         cam_periph_assert(periph, MA_OWNED);
 521
 522         periph->flags &= ~CAM_PERIPH_LOCKED;
 523         if ((periph->flags & CAM_PERIPH_LOCK_WANTED) != 0) {
 524                 periph->flags &= ~CAM_PERIPH_LOCK_WANTED;
 525                 wakeup(periph);
 526         }
 527
 528         cam_periph_release_locked(periph);
 529 }
 530
 531 /*
 532  * Look for the next unit number that is not currently in use for this
 533  * peripheral type starting at "newunit".  Also exclude unit numbers that
 534  * are reserved by for future "hardwiring" unless we already know that this
 535  * is a potential wired device.  Only assume that the device is "wired" the
 536  * first time through the loop since after that we'll be looking at unit
 537  * numbers that did not match a wiring entry.
 538  */
 539 static u_int
 540 camperiphnextunit(struct periph_driver *p_drv, u_int newunit, int wired,
 541                   path_id_t pathid, target_id_t target, lun_id_t lun)
 542 {
 543         struct  cam_periph *periph;
 544         char    *periph_name;
 545         int     i, val, dunit, r;
 546         const char *dname, *strval;
 547
 548         periph_name = p_drv->driver_name;
 549         for (;;newunit++) {
 550                 for (periph = TAILQ_FIRST(&p_drv->units);
 551                      periph != NULL && periph->unit_number != newunit;
 552                      periph = TAILQ_NEXT(periph, unit_links))
 553                         ;
 554
 555                 if (periph != NULL && periph->unit_number == newunit) {
 556                         if (wired != 0) {
 557                                 xpt_print(periph->path, "Duplicate Wired "
 558                                     "Device entry!\n");
 559                                 xpt_print(periph->path, "Second device (%s "
 560                                     "device at scbus%d target %d lun %d) will "
 561                                     "not be wired\n", periph_name, pathid,
 562                                     target, lun);
 563                                 wired = 0;
 564                         }
 565                         continue;
 566                 }
 567                 if (wired)
 568                         break;
 569
 570                 /*
 571                  * Don't match entries like "da 4" as a wired down
 572                  * device, but do match entries like "da 4 target 5"
 573                  * or even "da 4 scbus 1".
 574                  */
 575                 i = 0;
 576                 dname = periph_name;
 577                 for (;;) {
 578                         r = resource_find_dev(&i, dname, &dunit, NULL, NULL);
 579                         if (r != 0)
 580                                 break;
 581                         /* if no "target" and no specific scbus, skip */
 582                         if (resource_int_value(dname, dunit, "target", &val) &&
 583                             (resource_string_value(dname, dunit, "at",&strval)||
 584                              strcmp(strval, "scbus") == 0))
 585                                 continue;
 586                         if (newunit == dunit)
 587                                 break;
 588                 }
 589                 if (r != 0)
 590                         break;
 591         }
 592         return (newunit);
 593 }
 594
 595 static u_int
 596 camperiphunit(struct periph_driver *p_drv, path_id_t pathid,
 597               target_id_t target, lun_id_t lun)
 598 {
 599         u_int   unit;
 600         int     wired, i, val, dunit;
 601         const char *dname, *strval;
 602         char    pathbuf[32], *periph_name;
 603
 604         periph_name = p_drv->driver_name;
 605         snprintf(pathbuf, sizeof(pathbuf), "scbus%d", pathid);
 606         unit = 0;
 607         i = 0;
 608         dname = periph_name;
 609         for (wired = 0; resource_find_dev(&i, dname, &dunit, NULL, NULL) == 0;
 610              wired = 0) {
 611                 if (resource_string_value(dname, dunit, "at", &strval) == 0) {
 612                         if (strcmp(strval, pathbuf) != 0)
 613                                 continue;
 614                         wired++;
 615                 }
 616                 if (resource_int_value(dname, dunit, "target", &val) == 0) {
 617                         if (val != target)
 618                                 continue;
 619                         wired++;
 620                 }
 621                 if (resource_int_value(dname, dunit, "lun", &val) == 0) {
 622                         if (val != lun)
 623                                 continue;
 624                         wired++;
 625                 }
 626                 if (wired != 0) {
 627                         unit = dunit;
 628                         break;
 629                 }
 630         }
 631
 632         /*
 633          * Either start from 0 looking for the next unit or from
 634          * the unit number given in the resource config.  This way,
 635          * if we have wildcard matches, we don't return the same
 636          * unit number twice.
 637          */
 638         unit = camperiphnextunit(p_drv, unit, wired, pathid, target, lun);
 639
 640         return (unit);
 641 }
 642
 643 void
 644 cam_periph_invalidate(struct cam_periph *periph)
 645 {
 646
 647         cam_periph_assert(periph, MA_OWNED);
 648         /*
 649          * We only tear down the device the first time a peripheral is
 650          * invalidated.
 651          */
 652         if ((periph->flags & CAM_PERIPH_INVALID) != 0)
 653                 return;
 654
 655         CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph invalidated\n"));
 656         if ((periph->flags & CAM_PERIPH_ANNOUNCED) && !rebooting) {
 657                 struct sbuf sb;
 658                 char buffer[160];
 659
 660                 sbuf_new(&sb, buffer, 160, SBUF_FIXEDLEN);
 661                 xpt_denounce_periph_sbuf(periph, &sb);
 662                 sbuf_finish(&sb);
 663                 sbuf_putbuf(&sb);
 664         }
 665         periph->flags |= CAM_PERIPH_INVALID;
 666         periph->flags &= ~CAM_PERIPH_NEW_DEV_FOUND;
 667         if (periph->periph_oninval != NULL)
 668                 periph->periph_oninval(periph);
 669         cam_periph_release_locked(periph);
 670 }
 671
 672 static void
 673 camperiphfree(struct cam_periph *periph)
 674 {
 675         struct periph_driver **p_drv;
 676         struct periph_driver *drv;
 677
 678         cam_periph_assert(periph, MA_OWNED);
 679         KASSERT(periph->periph_allocating == 0, ("%s%d: freed while allocating",
 680             periph->periph_name, periph->unit_number));
 681         for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
 682                 if (strcmp((*p_drv)->driver_name, periph->periph_name) == 0)
 683                         break;
 684         }
 685         if (*p_drv == NULL) {
 686                 printf("camperiphfree: attempt to free non-existant periph\n");
 687                 return;
 688         }
 689         /*
 690          * Cache a pointer to the periph_driver structure.  If a
 691          * periph_driver is added or removed from the array (see
 692          * periphdriver_register()) while we drop the toplogy lock
 693          * below, p_drv may change.  This doesn't protect against this
 694          * particular periph_driver going away.  That will require full
 695          * reference counting in the periph_driver infrastructure.
 696          */
 697         drv = *p_drv;
 698
 699         /*
 700          * We need to set this flag before dropping the topology lock, to
 701          * let anyone who is traversing the list that this peripheral is
 702          * about to be freed, and there will be no more reference count
 703          * checks.
 704          */
 705         periph->flags |= CAM_PERIPH_FREE;
 706
 707         /*
 708          * The peripheral destructor semantics dictate calling with only the
 709          * SIM mutex held.  Since it might sleep, it should not be called
 710          * with the topology lock held.
 711          */
 712         xpt_unlock_buses();
 713
 714         /*
 715          * We need to call the peripheral destructor prior to removing the
 716          * peripheral from the list.  Otherwise, we risk running into a
 717          * scenario where the peripheral unit number may get reused
 718          * (because it has been removed from the list), but some resources
 719          * used by the peripheral are still hanging around.  In particular,
 720          * the devfs nodes used by some peripherals like the pass(4) driver
 721          * aren't fully cleaned up until the destructor is run.  If the
 722          * unit number is reused before the devfs instance is fully gone,
 723          * devfs will panic.
 724          */
 725         if (periph->periph_dtor != NULL)
 726                 periph->periph_dtor(periph);
 727
 728         /*
 729          * The peripheral list is protected by the topology lock. We have to
 730          * remove the periph from the drv list before we call deferred_ac. The
 731          * AC_FOUND_DEVICE callback won't create a new periph if it's still there.
 732          */
 733         xpt_lock_buses();
 734
 735         TAILQ_REMOVE(&drv->units, periph, unit_links);
 736         drv->generation++;
 737
 738         xpt_remove_periph(periph);
 739
 740         xpt_unlock_buses();
 741         if ((periph->flags & CAM_PERIPH_ANNOUNCED) && !rebooting)
 742                 xpt_print(periph->path, "Periph destroyed\n");
 743         else
 744                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph destroyed\n"));
 745
 746         if (periph->flags & CAM_PERIPH_NEW_DEV_FOUND) {
 747                 union ccb ccb;
 748                 void *arg;
 749
 750                 switch (periph->deferred_ac) {
 751                 case AC_FOUND_DEVICE:
 752                         ccb.ccb_h.func_code = XPT_GDEV_TYPE;
 753                         xpt_setup_ccb(&ccb.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 754                         xpt_action(&ccb);
 755                         arg = &ccb;
 756                         break;
 757                 case AC_PATH_REGISTERED:
 758                         xpt_path_inq(&ccb.cpi, periph->path);
 759                         arg = &ccb;
 760                         break;
 761                 default:
 762                         arg = NULL;
 763                         break;
 764                 }
 765                 periph->deferred_callback(NULL, periph->deferred_ac,
 766                                           periph->path, arg);
 767         }
 768         xpt_free_path(periph->path);
 769         free(periph, M_CAMPERIPH);
 770         xpt_lock_buses();
 771 }
 772
 773 /*
 774  * Map user virtual pointers into kernel virtual address space, so we can
 775  * access the memory.  This is now a generic function that centralizes most
 776  * of the sanity checks on the data flags, if any.
 777  * This also only works for up to maxphys memory.  Since we use
 778  * buffers to map stuff in and out, we're limited to the buffer size.
 779  */
 780 int
 781 cam_periph_mapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo,
 782     u_int maxmap)
 783 {
 784         int numbufs, i;
 785         u_int8_t **data_ptrs[CAM_PERIPH_MAXMAPS];
 786         u_int32_t lengths[CAM_PERIPH_MAXMAPS];
 787         u_int32_t dirs[CAM_PERIPH_MAXMAPS];
 788
 789         bzero(mapinfo, sizeof(*mapinfo));
 790         if (maxmap == 0)
 791                 maxmap = DFLTPHYS;      /* traditional default */
 792         else if (maxmap > maxphys)
 793                 maxmap = maxphys;       /* for safety */
 794         switch(ccb->ccb_h.func_code) {
 795         case XPT_DEV_MATCH:
 796                 if (ccb->cdm.match_buf_len == 0) {
 797                         printf("cam_periph_mapmem: invalid match buffer "
 798                                "length 0\n");
 799                         return(EINVAL);
 800                 }
 801                 if (ccb->cdm.pattern_buf_len > 0) {
 802                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.patterns;
 803                         lengths[0] = ccb->cdm.pattern_buf_len;
 804                         dirs[0] = CAM_DIR_OUT;
 805                         data_ptrs[1] = (u_int8_t **)&ccb->cdm.matches;
 806                         lengths[1] = ccb->cdm.match_buf_len;
 807                         dirs[1] = CAM_DIR_IN;
 808                         numbufs = 2;
 809                 } else {
 810                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.matches;
 811                         lengths[0] = ccb->cdm.match_buf_len;
 812                         dirs[0] = CAM_DIR_IN;
 813                         numbufs = 1;
 814                 }
 815                 /*
 816                  * This request will not go to the hardware, no reason
 817                  * to be so strict. vmapbuf() is able to map up to maxphys.
 818                  */
 819                 maxmap = maxphys;
 820                 break;
 821         case XPT_SCSI_IO:
 822         case XPT_CONT_TARGET_IO:
 823                 if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_NONE)
 824                         return(0);
 825                 if ((ccb->ccb_h.flags & CAM_DATA_MASK) != CAM_DATA_VADDR)
 826                         return (EINVAL);
 827                 data_ptrs[0] = &ccb->csio.data_ptr;
 828                 lengths[0] = ccb->csio.dxfer_len;
 829                 dirs[0] = ccb->ccb_h.flags & CAM_DIR_MASK;
 830                 numbufs = 1;
 831                 break;
 832         case XPT_ATA_IO:
 833                 if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_NONE)
 834                         return(0);
 835                 if ((ccb->ccb_h.flags & CAM_DATA_MASK) != CAM_DATA_VADDR)
 836                         return (EINVAL);
 837                 data_ptrs[0] = &ccb->ataio.data_ptr;
 838                 lengths[0] = ccb->ataio.dxfer_len;
 839                 dirs[0] = ccb->ccb_h.flags & CAM_DIR_MASK;
 840                 numbufs = 1;
 841                 break;
 842         case XPT_MMC_IO:
 843                 if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_NONE)
 844                         return(0);
 845                 /* Two mappings: one for cmd->data and one for cmd->data->data */
 846                 data_ptrs[0] = (unsigned char **)&ccb->mmcio.cmd.data;
 847                 lengths[0] = sizeof(struct mmc_data *);
 848                 dirs[0] = ccb->ccb_h.flags & CAM_DIR_MASK;
 849                 data_ptrs[1] = (unsigned char **)&ccb->mmcio.cmd.data->data;
 850                 lengths[1] = ccb->mmcio.cmd.data->len;
 851                 dirs[1] = ccb->ccb_h.flags & CAM_DIR_MASK;
 852                 numbufs = 2;
 853                 break;
 854         case XPT_SMP_IO:
 855                 data_ptrs[0] = &ccb->smpio.smp_request;
 856                 lengths[0] = ccb->smpio.smp_request_len;
 857                 dirs[0] = CAM_DIR_OUT;
 858                 data_ptrs[1] = &ccb->smpio.smp_response;
 859                 lengths[1] = ccb->smpio.smp_response_len;
 860                 dirs[1] = CAM_DIR_IN;
 861                 numbufs = 2;
 862                 break;
 863         case XPT_NVME_IO:
 864         case XPT_NVME_ADMIN:
 865                 if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_NONE)
 866                         return (0);
 867                 if ((ccb->ccb_h.flags & CAM_DATA_MASK) != CAM_DATA_VADDR)
 868                         return (EINVAL);
 869                 data_ptrs[0] = &ccb->nvmeio.data_ptr;
 870                 lengths[0] = ccb->nvmeio.dxfer_len;
 871                 dirs[0] = ccb->ccb_h.flags & CAM_DIR_MASK;
 872                 numbufs = 1;
 873                 break;
 874         case XPT_DEV_ADVINFO:
 875                 if (ccb->cdai.bufsiz == 0)
 876                         return (0);
 877
 878                 data_ptrs[0] = (uint8_t **)&ccb->cdai.buf;
 879                 lengths[0] = ccb->cdai.bufsiz;
 880                 dirs[0] = CAM_DIR_IN;
 881                 numbufs = 1;
 882
 883                 /*
 884                  * This request will not go to the hardware, no reason
 885                  * to be so strict. vmapbuf() is able to map up to maxphys.
 886                  */
 887                 maxmap = maxphys;
 888                 break;
 889         default:
 890                 return(EINVAL);
 891                 break; /* NOTREACHED */
 892         }
 893
 894         /*
 895          * Check the transfer length and permissions first, so we don't
 896          * have to unmap any previously mapped buffers.
 897          */
 898         for (i = 0; i < numbufs; i++) {
 899                 if (lengths[i] > maxmap) {
 900                         printf("cam_periph_mapmem: attempt to map %lu bytes, "
 901                                "which is greater than %lu\n",
 902                                (long)(lengths[i]), (u_long)maxmap);
 903                         return (E2BIG);
 904                 }
 905         }
 906
 907         /*
 908          * This keeps the kernel stack of current thread from getting
 909          * swapped.  In low-memory situations where the kernel stack might
 910          * otherwise get swapped out, this holds it and allows the thread
 911          * to make progress and release the kernel mapped pages sooner.
 912          *
 913          * XXX KDM should I use P_NOSWAP instead?
 914          */
 915         PHOLD(curproc);
 916
 917         for (i = 0; i < numbufs; i++) {
 918                 /* Save the user's data address. */
 919                 mapinfo->orig[i] = *data_ptrs[i];
 920
 921                 /*
 922                  * For small buffers use malloc+copyin/copyout instead of
 923                  * mapping to KVA to avoid expensive TLB shootdowns.  For
 924                  * small allocations malloc is backed by UMA, and so much
 925                  * cheaper on SMP systems.
 926                  */
 927                 if (lengths[i] <= periph_mapmem_thresh &&
 928                     ccb->ccb_h.func_code != XPT_MMC_IO) {
 929                         *data_ptrs[i] = malloc(lengths[i], M_CAMPERIPH,
 930                             M_WAITOK);
 931                         if (dirs[i] != CAM_DIR_IN) {
 932                                 if (copyin(mapinfo->orig[i], *data_ptrs[i],
 933                                     lengths[i]) != 0) {
 934                                         free(*data_ptrs[i], M_CAMPERIPH);
 935                                         *data_ptrs[i] = mapinfo->orig[i];
 936                                         goto fail;
 937                                 }
 938                         } else
 939                                 bzero(*data_ptrs[i], lengths[i]);
 940                         continue;
 941                 }
 942
 943                 /*
 944                  * Get the buffer.
 945                  */
 946                 mapinfo->bp[i] = uma_zalloc(pbuf_zone, M_WAITOK);
 947
 948                 /* set the direction */
 949                 mapinfo->bp[i]->b_iocmd = (dirs[i] == CAM_DIR_OUT) ?
 950                     BIO_WRITE : BIO_READ;
 951
 952                 /* Map the buffer into kernel memory. */
 953                 if (vmapbuf(mapinfo->bp[i], *data_ptrs[i], lengths[i], 1) < 0) {
 954                         uma_zfree(pbuf_zone, mapinfo->bp[i]);
 955                         goto fail;
 956                 }
 957
 958                 /* set our pointer to the new mapped area */
 959                 *data_ptrs[i] = mapinfo->bp[i]->b_data;
 960         }
 961
 962         /*
 963          * Now that we've gotten this far, change ownership to the kernel
 964          * of the buffers so that we don't run afoul of returning to user
 965          * space with locks (on the buffer) held.
 966          */
 967         for (i = 0; i < numbufs; i++) {
 968                 if (mapinfo->bp[i])
 969                         BUF_KERNPROC(mapinfo->bp[i]);
 970         }
 971
 972         mapinfo->num_bufs_used = numbufs;
 973         return(0);
 974
 975 fail:
 976         for (i--; i >= 0; i--) {
 977                 if (mapinfo->bp[i]) {
 978                         vunmapbuf(mapinfo->bp[i]);
 979                         uma_zfree(pbuf_zone, mapinfo->bp[i]);
 980                 } else
 981                         free(*data_ptrs[i], M_CAMPERIPH);
 982                 *data_ptrs[i] = mapinfo->orig[i];
 983         }
 984         PRELE(curproc);
 985         return(EACCES);
 986 }
 987
 988 /*
 989  * Unmap memory segments mapped into kernel virtual address space by
 990  * cam_periph_mapmem().
 991  */
 992 void
 993 cam_periph_unmapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo)
 994 {
 995         int numbufs, i;
 996         u_int8_t **data_ptrs[CAM_PERIPH_MAXMAPS];
 997         u_int32_t lengths[CAM_PERIPH_MAXMAPS];
 998         u_int32_t dirs[CAM_PERIPH_MAXMAPS];
 999
1000         if (mapinfo->num_bufs_used <= 0) {
1001                 /* nothing to free and the process wasn't held. */
1002                 return;
1003         }
1004
1005         switch (ccb->ccb_h.func_code) {
1006         case XPT_DEV_MATCH:
1007                 if (ccb->cdm.pattern_buf_len > 0) {
1008                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.patterns;
1009                         lengths[0] = ccb->cdm.pattern_buf_len;
1010                         dirs[0] = CAM_DIR_OUT;
1011                         data_ptrs[1] = (u_int8_t **)&ccb->cdm.matches;
1012                         lengths[1] = ccb->cdm.match_buf_len;
1013                         dirs[1] = CAM_DIR_IN;
1014                         numbufs = 2;
1015                 } else {
1016                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.matches;
1017                         lengths[0] = ccb->cdm.match_buf_len;
1018                         dirs[0] = CAM_DIR_IN;
1019                         numbufs = 1;
1020                 }
1021                 break;
1022         case XPT_SCSI_IO:
1023         case XPT_CONT_TARGET_IO:
1024                 data_ptrs[0] = &ccb->csio.data_ptr;
1025                 lengths[0] = ccb->csio.dxfer_len;
1026                 dirs[0] = ccb->ccb_h.flags & CAM_DIR_MASK;
1027                 numbufs = 1;
1028                 break;
1029         case XPT_ATA_IO:
1030                 data_ptrs[0] = &ccb->ataio.data_ptr;
1031                 lengths[0] = ccb->ataio.dxfer_len;
1032                 dirs[0] = ccb->ccb_h.flags & CAM_DIR_MASK;
1033                 numbufs = 1;
1034                 break;
1035         case XPT_MMC_IO:
1036                 data_ptrs[0] = (u_int8_t **)&ccb->mmcio.cmd.data;
1037                 lengths[0] = sizeof(struct mmc_data *);
1038                 dirs[0] = ccb->ccb_h.flags & CAM_DIR_MASK;
1039                 data_ptrs[1] = (u_int8_t **)&ccb->mmcio.cmd.data->data;
1040                 lengths[1] = ccb->mmcio.cmd.data->len;
1041                 dirs[1] = ccb->ccb_h.flags & CAM_DIR_MASK;
1042                 numbufs = 2;
1043                 break;
1044         case XPT_SMP_IO:
1045                 data_ptrs[0] = &ccb->smpio.smp_request;
1046                 lengths[0] = ccb->smpio.smp_request_len;
1047                 dirs[0] = CAM_DIR_OUT;
1048                 data_ptrs[1] = &ccb->smpio.smp_response;
1049                 lengths[1] = ccb->smpio.smp_response_len;
1050                 dirs[1] = CAM_DIR_IN;
1051                 numbufs = 2;
1052                 break;
1053         case XPT_NVME_IO:
1054         case XPT_NVME_ADMIN:
1055                 data_ptrs[0] = &ccb->nvmeio.data_ptr;
1056                 lengths[0] = ccb->nvmeio.dxfer_len;
1057                 dirs[0] = ccb->ccb_h.flags & CAM_DIR_MASK;
1058                 numbufs = 1;
1059                 break;
1060         case XPT_DEV_ADVINFO:
1061                 data_ptrs[0] = (uint8_t **)&ccb->cdai.buf;
1062                 lengths[0] = ccb->cdai.bufsiz;
1063                 dirs[0] = CAM_DIR_IN;
1064                 numbufs = 1;
1065                 break;
1066         default:
1067                 /* allow ourselves to be swapped once again */
1068                 PRELE(curproc);
1069                 return;
1070                 break; /* NOTREACHED */
1071         }
1072
1073         for (i = 0; i < numbufs; i++) {
1074                 if (mapinfo->bp[i]) {
1075                         /* unmap the buffer */
1076                         vunmapbuf(mapinfo->bp[i]);
1077
1078                         /* release the buffer */
1079                         uma_zfree(pbuf_zone, mapinfo->bp[i]);
1080                 } else {
1081                         if (dirs[i] != CAM_DIR_OUT) {
1082                                 copyout(*data_ptrs[i], mapinfo->orig[i],
1083                                     lengths[i]);
1084                         }
1085                         free(*data_ptrs[i], M_CAMPERIPH);
1086                 }
1087
1088                 /* Set the user's pointer back to the original value */
1089                 *data_ptrs[i] = mapinfo->orig[i];
1090         }
1091
1092         /* allow ourselves to be swapped once again */
1093         PRELE(curproc);
1094 }
1095
1096 int
1097 cam_periph_ioctl(struct cam_periph *periph, u_long cmd, caddr_t addr,
1098                  int (*error_routine)(union ccb *ccb,
1099                                       cam_flags camflags,
1100                                       u_int32_t sense_flags))
1101 {
1102         union ccb            *ccb;
1103         int                  error;
1104         int                  found;
1105
1106         error = found = 0;
1107
1108         switch(cmd){
1109         case CAMGETPASSTHRU:
1110                 ccb = cam_periph_getccb(periph, CAM_PRIORITY_NORMAL);
1111                 xpt_setup_ccb(&ccb->ccb_h,
1112                               ccb->ccb_h.path,
1113                               CAM_PRIORITY_NORMAL);
1114                 ccb->ccb_h.func_code = XPT_GDEVLIST;
1115
1116                 /*
1117                  * Basically, the point of this is that we go through
1118                  * getting the list of devices, until we find a passthrough
1119                  * device.  In the current version of the CAM code, the
1120                  * only way to determine what type of device we're dealing
1121                  * with is by its name.
1122                  */
1123                 while (found == 0) {
1124                         ccb->cgdl.index = 0;
1125                         ccb->cgdl.status = CAM_GDEVLIST_MORE_DEVS;
1126                         while (ccb->cgdl.status == CAM_GDEVLIST_MORE_DEVS) {
1127                                 /* we want the next device in the list */
1128                                 xpt_action(ccb);
1129                                 if (strncmp(ccb->cgdl.periph_name,
1130                                     "pass", 4) == 0){
1131                                         found = 1;
1132                                         break;
1133                                 }
1134                         }
1135                         if ((ccb->cgdl.status == CAM_GDEVLIST_LAST_DEVICE) &&
1136                             (found == 0)) {
1137                                 ccb->cgdl.periph_name[0] = '\0';
1138                                 ccb->cgdl.unit_number = 0;
1139                                 break;
1140                         }
1141                 }
1142
1143                 /* copy the result back out */
1144                 bcopy(ccb, addr, sizeof(union ccb));
1145
1146                 /* and release the ccb */
1147                 xpt_release_ccb(ccb);
1148
1149                 break;
1150         default:
1151                 error = ENOTTY;
1152                 break;
1153         }
1154         return(error);
1155 }
1156
1157 static void
1158 cam_periph_done_panic(struct cam_periph *periph, union ccb *done_ccb)
1159 {
1160
1161         panic("%s: already done with ccb %p", __func__, done_ccb);
1162 }
1163
1164 static void
1165 cam_periph_done(struct cam_periph *periph, union ccb *done_ccb)
1166 {
1167
1168         /* Caller will release the CCB */
1169         xpt_path_assert(done_ccb->ccb_h.path, MA_OWNED);
1170         done_ccb->ccb_h.cbfcnp = cam_periph_done_panic;
1171         wakeup(&done_ccb->ccb_h.cbfcnp);
1172 }
1173
1174 static void
1175 cam_periph_ccbwait(union ccb *ccb)
1176 {
1177
1178         if ((ccb->ccb_h.func_code & XPT_FC_QUEUED) != 0) {
1179                 while (ccb->ccb_h.cbfcnp != cam_periph_done_panic)
1180                         xpt_path_sleep(ccb->ccb_h.path, &ccb->ccb_h.cbfcnp,
1181                             PRIBIO, "cbwait", 0);
1182         }
1183         KASSERT(ccb->ccb_h.pinfo.index == CAM_UNQUEUED_INDEX &&
1184             (ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_INPROG,
1185             ("%s: proceeding with incomplete ccb: ccb=%p, func_code=%#x, "
1186              "status=%#x, index=%d", __func__, ccb, ccb->ccb_h.func_code,
1187              ccb->ccb_h.status, ccb->ccb_h.pinfo.index));
1188 }
1189
1190 /*
1191  * Dispatch a CCB and wait for it to complete.  If the CCB has set a
1192  * callback function (ccb->ccb_h.cbfcnp), it will be overwritten and lost.
1193  */
1194 int
1195 cam_periph_runccb(union ccb *ccb,
1196                   int (*error_routine)(union ccb *ccb,
1197                                        cam_flags camflags,
1198                                        u_int32_t sense_flags),
1199                   cam_flags camflags, u_int32_t sense_flags,
1200                   struct devstat *ds)
1201 {
1202         struct bintime *starttime;
1203         struct bintime ltime;
1204         int error;
1205         bool must_poll;
1206         uint32_t timeout = 1;
1207
1208         starttime = NULL;
1209         xpt_path_assert(ccb->ccb_h.path, MA_OWNED);
1210         KASSERT((ccb->ccb_h.flags & CAM_UNLOCKED) == 0,
1211             ("%s: ccb=%p, func_code=%#x, flags=%#x", __func__, ccb,
1212              ccb->ccb_h.func_code, ccb->ccb_h.flags));
1213
1214         /*
1215          * If the user has supplied a stats structure, and if we understand
1216          * this particular type of ccb, record the transaction start.
1217          */
1218         if (ds != NULL &&
1219             (ccb->ccb_h.func_code == XPT_SCSI_IO ||
1220             ccb->ccb_h.func_code == XPT_ATA_IO ||
1221             ccb->ccb_h.func_code == XPT_NVME_IO)) {
1222                 starttime = &ltime;
1223                 binuptime(starttime);
1224                 devstat_start_transaction(ds, starttime);
1225         }
1226
1227         /*
1228          * We must poll the I/O while we're dumping. The scheduler is normally
1229          * stopped for dumping, except when we call doadump from ddb. While the
1230          * scheduler is running in this case, we still need to poll the I/O to
1231          * avoid sleeping waiting for the ccb to complete.
1232          *
1233          * A panic triggered dump stops the scheduler, any callback from the
1234          * shutdown_post_sync event will run with the scheduler stopped, but
1235          * before we're officially dumping. To avoid hanging in adashutdown
1236          * initiated commands (or other similar situations), we have to test for
1237          * either SCHEDULER_STOPPED() here as well.
1238          *
1239          * To avoid locking problems, dumping/polling callers must call
1240          * without a periph lock held.
1241          */
1242         must_poll = dumping || SCHEDULER_STOPPED();
1243         ccb->ccb_h.cbfcnp = cam_periph_done;
1244
1245         /*
1246          * If we're polling, then we need to ensure that we have ample resources
1247          * in the periph.  cam_periph_error can reschedule the ccb by calling
1248          * xpt_action and returning ERESTART, so we have to effect the polling
1249          * in the do loop below.
1250          */
1251         if (must_poll) {
1252                 if (cam_sim_pollable(ccb->ccb_h.path->bus->sim))
1253                         timeout = xpt_poll_setup(ccb);
1254                 else
1255                         timeout = 0;
1256         }
1257
1258         if (timeout == 0) {
1259                 ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
1260                 error = EBUSY;
1261         } else {
1262                 xpt_action(ccb);
1263                 do {
1264                         if (must_poll) {
1265                                 xpt_pollwait(ccb, timeout);
1266                                 timeout = ccb->ccb_h.timeout * 10;
1267                         } else {
1268                                 cam_periph_ccbwait(ccb);
1269                         }
1270                         if ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP)
1271                                 error = 0;
1272                         else if (error_routine != NULL) {
1273                                 ccb->ccb_h.cbfcnp = cam_periph_done;
1274                                 error = (*error_routine)(ccb, camflags, sense_flags);
1275                         } else
1276                                 error = 0;
1277                 } while (error == ERESTART);
1278         }
1279
1280         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) {
1281                 cam_release_devq(ccb->ccb_h.path,
1282                                  /* relsim_flags */0,
1283                                  /* openings */0,
1284                                  /* timeout */0,
1285                                  /* getcount_only */ FALSE);
1286                 ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
1287         }
1288
1289         if (ds != NULL) {
1290                 uint32_t bytes;
1291                 devstat_tag_type tag;
1292                 bool valid = true;
1293
1294                 if (ccb->ccb_h.func_code == XPT_SCSI_IO) {
1295                         bytes = ccb->csio.dxfer_len - ccb->csio.resid;
1296                         tag = (devstat_tag_type)(ccb->csio.tag_action & 0x3);
1297                 } else if (ccb->ccb_h.func_code == XPT_ATA_IO) {
1298                         bytes = ccb->ataio.dxfer_len - ccb->ataio.resid;
1299                         tag = (devstat_tag_type)0;
1300                 } else if (ccb->ccb_h.func_code == XPT_NVME_IO) {
1301                         bytes = ccb->nvmeio.dxfer_len; /* NB: resid no possible */
1302                         tag = (devstat_tag_type)0;
1303                 } else {
1304                         valid = false;
1305                 }
1306                 if (valid)
1307                         devstat_end_transaction(ds, bytes, tag,
1308                             ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_NONE) ?
1309                             DEVSTAT_NO_DATA : (ccb->ccb_h.flags & CAM_DIR_OUT) ?
1310                             DEVSTAT_WRITE : DEVSTAT_READ, NULL, starttime);
1311         }
1312
1313         return(error);
1314 }
1315
1316 void
1317 cam_freeze_devq(struct cam_path *path)
1318 {
1319         struct ccb_hdr ccb_h;
1320
1321         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("cam_freeze_devq\n"));
1322         xpt_setup_ccb(&ccb_h, path, /*priority*/1);
1323         ccb_h.func_code = XPT_NOOP;
1324         ccb_h.flags = CAM_DEV_QFREEZE;
1325         xpt_action((union ccb *)&ccb_h);
1326 }
1327
1328 u_int32_t
1329 cam_release_devq(struct cam_path *path, u_int32_t relsim_flags,
1330                  u_int32_t openings, u_int32_t arg,
1331                  int getcount_only)
1332 {
1333         struct ccb_relsim crs;
1334
1335         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("cam_release_devq(%u, %u, %u, %d)\n",
1336             relsim_flags, openings, arg, getcount_only));
1337         xpt_setup_ccb(&crs.ccb_h, path, CAM_PRIORITY_NORMAL);
1338         crs.ccb_h.func_code = XPT_REL_SIMQ;
1339         crs.ccb_h.flags = getcount_only ? CAM_DEV_QFREEZE : 0;
1340         crs.release_flags = relsim_flags;
1341         crs.openings = openings;
1342         crs.release_timeout = arg;
1343         xpt_action((union ccb *)&crs);
1344         return (crs.qfrozen_cnt);
1345 }
1346
1347 #define saved_ccb_ptr ppriv_ptr0
1348 static void
1349 camperiphdone(struct cam_periph *periph, union ccb *done_ccb)
1350 {
1351         union ccb      *saved_ccb;
1352         cam_status      status;
1353         struct scsi_start_stop_unit *scsi_cmd;
1354         int             error = 0, error_code, sense_key, asc, ascq;
1355
1356         scsi_cmd = (struct scsi_start_stop_unit *)
1357             &done_ccb->csio.cdb_io.cdb_bytes;
1358         status = done_ccb->ccb_h.status;
1359
1360         if ((status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
1361                 if (scsi_extract_sense_ccb(done_ccb,
1362                     &error_code, &sense_key, &asc, &ascq)) {
1363                         /*
1364                          * If the error is "invalid field in CDB",
1365                          * and the load/eject flag is set, turn the
1366                          * flag off and try again.  This is just in
1367                          * case the drive in question barfs on the
1368                          * load eject flag.  The CAM code should set
1369                          * the load/eject flag by default for
1370                          * removable media.
1371                          */
1372                         if ((scsi_cmd->opcode == START_STOP_UNIT) &&
1373                             ((scsi_cmd->how & SSS_LOEJ) != 0) &&
1374                              (asc == 0x24) && (ascq == 0x00)) {
1375                                 scsi_cmd->how &= ~SSS_LOEJ;
1376                                 if (status & CAM_DEV_QFRZN) {
1377                                         cam_release_devq(done_ccb->ccb_h.path,
1378                                             0, 0, 0, 0);
1379                                         done_ccb->ccb_h.status &=
1380                                             ~CAM_DEV_QFRZN;
1381                                 }
1382                                 xpt_action(done_ccb);
1383                                 goto out;
1384                         }
1385                 }
1386                 error = cam_periph_error(done_ccb, 0,
1387                     SF_RETRY_UA | SF_NO_PRINT);
1388                 if (error == ERESTART)
1389                         goto out;
1390                 if (done_ccb->ccb_h.status & CAM_DEV_QFRZN) {
1391                         cam_release_devq(done_ccb->ccb_h.path, 0, 0, 0, 0);
1392                         done_ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
1393                 }
1394         } else {
1395                 /*
1396                  * If we have successfully taken a device from the not
1397                  * ready to ready state, re-scan the device and re-get
1398                  * the inquiry information.  Many devices (mostly disks)
1399                  * don't properly report their inquiry information unless
1400                  * they are spun up.
1401                  */
1402                 if (scsi_cmd->opcode == START_STOP_UNIT)
1403                         xpt_async(AC_INQ_CHANGED, done_ccb->ccb_h.path, NULL);
1404         }
1405
1406         /* If we tried long wait and still failed, remember that. */
1407         if ((periph->flags & CAM_PERIPH_RECOVERY_WAIT) &&
1408             (done_ccb->csio.cdb_io.cdb_bytes[0] == TEST_UNIT_READY)) {
1409                 periph->flags &= ~CAM_PERIPH_RECOVERY_WAIT;
1410                 if (error != 0 && done_ccb->ccb_h.retry_count == 0)
1411                         periph->flags |= CAM_PERIPH_RECOVERY_WAIT_FAILED;
1412         }
1413
1414         /*
1415          * After recovery action(s) completed, return to the original CCB.
1416          * If the recovery CCB has failed, considering its own possible
1417          * retries and recovery, assume we are back in state where we have
1418          * been originally, but without recovery hopes left.  In such case,
1419          * after the final attempt below, we cancel any further retries,
1420          * blocking by that also any new recovery attempts for this CCB,
1421          * and the result will be the final one returned to the CCB owher.
1422          */
1423         saved_ccb = (union ccb *)done_ccb->ccb_h.saved_ccb_ptr;
1424         bcopy(saved_ccb, done_ccb, sizeof(*done_ccb));
1425         xpt_free_ccb(saved_ccb);
1426         if (done_ccb->ccb_h.cbfcnp != camperiphdone)
1427                 periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG;
1428         if (error != 0)
1429                 done_ccb->ccb_h.retry_count = 0;
1430         xpt_action(done_ccb);
1431
1432 out:
1433         /* Drop freeze taken due to CAM_DEV_QFREEZE flag set. */
1434         cam_release_devq(done_ccb->ccb_h.path, 0, 0, 0, 0);
1435 }
1436
1437 /*
1438  * Generic Async Event handler.  Peripheral drivers usually
1439  * filter out the events that require personal attention,
1440  * and leave the rest to this function.
1441  */
1442 void
1443 cam_periph_async(struct cam_periph *periph, u_int32_t code,
1444                  struct cam_path *path, void *arg)
1445 {
1446         switch (code) {
1447         case AC_LOST_DEVICE:
1448                 cam_periph_invalidate(periph);
1449                 break;
1450         default:
1451                 break;
1452         }
1453 }
1454
1455 void
1456 cam_periph_bus_settle(struct cam_periph *periph, u_int bus_settle)
1457 {
1458         struct ccb_getdevstats cgds;
1459
1460         xpt_setup_ccb(&cgds.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
1461         cgds.ccb_h.func_code = XPT_GDEV_STATS;
1462         xpt_action((union ccb *)&cgds);
1463         cam_periph_freeze_after_event(periph, &cgds.last_reset, bus_settle);
1464 }
1465
1466 void
1467 cam_periph_freeze_after_event(struct cam_periph *periph,
1468                               struct timeval* event_time, u_int duration_ms)
1469 {
1470         struct timeval delta;
1471         struct timeval duration_tv;
1472
1473         if (!timevalisset(event_time))
1474                 return;
1475
1476         microtime(&delta);
1477         timevalsub(&delta, event_time);
1478         duration_tv.tv_sec = duration_ms / 1000;
1479         duration_tv.tv_usec = (duration_ms % 1000) * 1000;
1480         if (timevalcmp(&delta, &duration_tv, <)) {
1481                 timevalsub(&duration_tv, &delta);
1482
1483                 duration_ms = duration_tv.tv_sec * 1000;
1484                 duration_ms += duration_tv.tv_usec / 1000;
1485                 cam_freeze_devq(periph->path);
1486                 cam_release_devq(periph->path,
1487                                 RELSIM_RELEASE_AFTER_TIMEOUT,
1488                                 /*reduction*/0,
1489                                 /*timeout*/duration_ms,
1490                                 /*getcount_only*/0);
1491         }
1492
1493 }
1494
1495 static int
1496 camperiphscsistatuserror(union ccb *ccb, union ccb **orig_ccb,
1497     cam_flags camflags, u_int32_t sense_flags,
1498     int *openings, u_int32_t *relsim_flags,
1499     u_int32_t *timeout, u_int32_t *action, const char **action_string)
1500 {
1501         struct cam_periph *periph;
1502         int error;
1503
1504         switch (ccb->csio.scsi_status) {
1505         case SCSI_STATUS_OK:
1506         case SCSI_STATUS_COND_MET:
1507         case SCSI_STATUS_INTERMED:
1508         case SCSI_STATUS_INTERMED_COND_MET:
1509                 error = 0;
1510                 break;
1511         case SCSI_STATUS_CMD_TERMINATED:
1512         case SCSI_STATUS_CHECK_COND:
1513                 error = camperiphscsisenseerror(ccb, orig_ccb,
1514                                                 camflags,
1515                                                 sense_flags,
1516                                                 openings,
1517                                                 relsim_flags,
1518                                                 timeout,
1519                                                 action,
1520                                                 action_string);
1521                 break;
1522         case SCSI_STATUS_QUEUE_FULL:
1523         {
1524                 /* no decrement */
1525                 struct ccb_getdevstats cgds;
1526
1527                 /*
1528                  * First off, find out what the current
1529                  * transaction counts are.
1530                  */
1531                 xpt_setup_ccb(&cgds.ccb_h,
1532                               ccb->ccb_h.path,
1533                               CAM_PRIORITY_NORMAL);
1534                 cgds.ccb_h.func_code = XPT_GDEV_STATS;
1535                 xpt_action((union ccb *)&cgds);
1536
1537                 /*
1538                  * If we were the only transaction active, treat
1539                  * the QUEUE FULL as if it were a BUSY condition.
1540                  */
1541                 if (cgds.dev_active != 0) {
1542                         int total_openings;
1543
1544                         /*
1545                          * Reduce the number of openings to
1546                          * be 1 less than the amount it took
1547                          * to get a queue full bounded by the
1548                          * minimum allowed tag count for this
1549                          * device.
1550                          */
1551                         total_openings = cgds.dev_active + cgds.dev_openings;
1552                         *openings = cgds.dev_active;
1553                         if (*openings < cgds.mintags)
1554                                 *openings = cgds.mintags;
1555                         if (*openings < total_openings)
1556                                 *relsim_flags = RELSIM_ADJUST_OPENINGS;
1557                         else {
1558                                 /*
1559                                  * Some devices report queue full for
1560                                  * temporary resource shortages.  For
1561                                  * this reason, we allow a minimum
1562                                  * tag count to be entered via a
1563                                  * quirk entry to prevent the queue
1564                                  * count on these devices from falling
1565                                  * to a pessimisticly low value.  We
1566                                  * still wait for the next successful
1567                                  * completion, however, before queueing
1568                                  * more transactions to the device.
1569                                  */
1570                                 *relsim_flags = RELSIM_RELEASE_AFTER_CMDCMPLT;
1571                         }
1572                         *timeout = 0;
1573                         error = ERESTART;
1574                         *action &= ~SSQ_PRINT_SENSE;
1575                         break;
1576                 }
1577                 /* FALLTHROUGH */
1578         }
1579         case SCSI_STATUS_BUSY:
1580                 /*
1581                  * Restart the queue after either another
1582                  * command completes or a 1 second timeout.
1583                  */
1584                 periph = xpt_path_periph(ccb->ccb_h.path);
1585                 if (periph->flags & CAM_PERIPH_INVALID) {
1586                         error = EIO;
1587                         *action_string = "Periph was invalidated";
1588                 } else if ((sense_flags & SF_RETRY_BUSY) != 0 ||
1589                     ccb->ccb_h.retry_count > 0) {
1590                         if ((sense_flags & SF_RETRY_BUSY) == 0)
1591                                 ccb->ccb_h.retry_count--;
1592                         error = ERESTART;
1593                         *relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT
1594                                       | RELSIM_RELEASE_AFTER_CMDCMPLT;
1595                         *timeout = 1000;
1596                 } else {
1597                         error = EIO;
1598                         *action_string = "Retries exhausted";
1599                 }
1600                 break;
1601         case SCSI_STATUS_RESERV_CONFLICT:
1602         default:
1603                 error = EIO;
1604                 break;
1605         }
1606         return (error);
1607 }
1608
1609 static int
1610 camperiphscsisenseerror(union ccb *ccb, union ccb **orig,
1611     cam_flags camflags, u_int32_t sense_flags,
1612     int *openings, u_int32_t *relsim_flags,
1613     u_int32_t *timeout, u_int32_t *action, const char **action_string)
1614 {
1615         struct cam_periph *periph;
1616         union ccb *orig_ccb = ccb;
1617         int error, recoveryccb;
1618
1619 #if defined(BUF_TRACKING) || defined(FULL_BUF_TRACKING)
1620         if (ccb->ccb_h.func_code == XPT_SCSI_IO && ccb->csio.bio != NULL)
1621                 biotrack(ccb->csio.bio, __func__);
1622 #endif
1623
1624         periph = xpt_path_periph(ccb->ccb_h.path);
1625         recoveryccb = (ccb->ccb_h.cbfcnp == camperiphdone);
1626         if ((periph->flags & CAM_PERIPH_RECOVERY_INPROG) && !recoveryccb) {
1627                 /*
1628                  * If error recovery is already in progress, don't attempt
1629                  * to process this error, but requeue it unconditionally
1630                  * and attempt to process it once error recovery has
1631                  * completed.  This failed command is probably related to
1632                  * the error that caused the currently active error recovery
1633                  * action so our  current recovery efforts should also
1634                  * address this command.  Be aware that the error recovery
1635                  * code assumes that only one recovery action is in progress
1636                  * on a particular peripheral instance at any given time
1637                  * (e.g. only one saved CCB for error recovery) so it is
1638                  * imperitive that we don't violate this assumption.
1639                  */
1640                 error = ERESTART;
1641                 *action &= ~SSQ_PRINT_SENSE;
1642         } else {
1643                 scsi_sense_action err_action;
1644                 struct ccb_getdev cgd;
1645
1646                 /*
1647                  * Grab the inquiry data for this device.
1648                  */
1649                 xpt_setup_ccb(&cgd.ccb_h, ccb->ccb_h.path, CAM_PRIORITY_NORMAL);
1650                 cgd.ccb_h.func_code = XPT_GDEV_TYPE;
1651                 xpt_action((union ccb *)&cgd);
1652
1653                 err_action = scsi_error_action(&ccb->csio, &cgd.inq_data,
1654                     sense_flags);
1655                 error = err_action & SS_ERRMASK;
1656
1657                 /*
1658                  * Do not autostart sequential access devices
1659                  * to avoid unexpected tape loading.
1660                  */
1661                 if ((err_action & SS_MASK) == SS_START &&
1662                     SID_TYPE(&cgd.inq_data) == T_SEQUENTIAL) {
1663                         *action_string = "Will not autostart a "
1664                             "sequential access device";
1665                         goto sense_error_done;
1666                 }
1667
1668                 /*
1669                  * Avoid recovery recursion if recovery action is the same.
1670                  */
1671                 if ((err_action & SS_MASK) >= SS_START && recoveryccb) {
1672                         if (((err_action & SS_MASK) == SS_START &&
1673                              ccb->csio.cdb_io.cdb_bytes[0] == START_STOP_UNIT) ||
1674                             ((err_action & SS_MASK) == SS_TUR &&
1675                              (ccb->csio.cdb_io.cdb_bytes[0] == TEST_UNIT_READY))) {
1676                                 err_action = SS_RETRY|SSQ_DECREMENT_COUNT|EIO;
1677                                 *relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
1678                                 *timeout = 500;
1679                         }
1680                 }
1681
1682                 /*
1683                  * If the recovery action will consume a retry,
1684                  * make sure we actually have retries available.
1685                  */
1686                 if ((err_action & SSQ_DECREMENT_COUNT) != 0) {
1687                         if (ccb->ccb_h.retry_count > 0 &&
1688                             (periph->flags & CAM_PERIPH_INVALID) == 0)
1689                                 ccb->ccb_h.retry_count--;
1690                         else {
1691                                 *action_string = "Retries exhausted";
1692                                 goto sense_error_done;
1693                         }
1694                 }
1695
1696                 if ((err_action & SS_MASK) >= SS_START) {
1697                         /*
1698                          * Do common portions of commands that
1699                          * use recovery CCBs.
1700                          */
1701                         orig_ccb = xpt_alloc_ccb_nowait();
1702                         if (orig_ccb == NULL) {
1703                                 *action_string = "Can't allocate recovery CCB";
1704                                 goto sense_error_done;
1705                         }
1706                         /*
1707                          * Clear freeze flag for original request here, as
1708                          * this freeze will be dropped as part of ERESTART.
1709                          */
1710                         ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
1711                         bcopy(ccb, orig_ccb, sizeof(*orig_ccb));
1712                 }
1713
1714                 switch (err_action & SS_MASK) {
1715                 case SS_NOP:
1716                         *action_string = "No recovery action needed";
1717                         error = 0;
1718                         break;
1719                 case SS_RETRY:
1720                         *action_string = "Retrying command (per sense data)";
1721                         error = ERESTART;
1722                         break;
1723                 case SS_FAIL:
1724                         *action_string = "Unretryable error";
1725                         break;
1726                 case SS_START:
1727                 {
1728                         int le;
1729
1730                         /*
1731                          * Send a start unit command to the device, and
1732                          * then retry the command.
1733                          */
1734                         *action_string = "Attempting to start unit";
1735                         periph->flags |= CAM_PERIPH_RECOVERY_INPROG;
1736
1737                         /*
1738                          * Check for removable media and set
1739                          * load/eject flag appropriately.
1740                          */
1741                         if (SID_IS_REMOVABLE(&cgd.inq_data))
1742                                 le = TRUE;
1743                         else
1744                                 le = FALSE;
1745
1746                         scsi_start_stop(&ccb->csio,
1747                                         /*retries*/1,
1748                                         camperiphdone,
1749                                         MSG_SIMPLE_Q_TAG,
1750                                         /*start*/TRUE,
1751                                         /*load/eject*/le,
1752                                         /*immediate*/FALSE,
1753                                         SSD_FULL_SIZE,
1754                                         /*timeout*/50000);
1755                         break;
1756                 }
1757                 case SS_TUR:
1758                 {
1759                         /*
1760                          * Send a Test Unit Ready to the device.
1761                          * If the 'many' flag is set, we send 120
1762                          * test unit ready commands, one every half
1763                          * second.  Otherwise, we just send one TUR.
1764                          * We only want to do this if the retry
1765                          * count has not been exhausted.
1766                          */
1767                         int retries;
1768
1769                         if ((err_action & SSQ_MANY) != 0 && (periph->flags &
1770                              CAM_PERIPH_RECOVERY_WAIT_FAILED) == 0) {
1771                                 periph->flags |= CAM_PERIPH_RECOVERY_WAIT;
1772                                 *action_string = "Polling device for readiness";
1773                                 retries = 120;
1774                         } else {
1775                                 *action_string = "Testing device for readiness";
1776                                 retries = 1;
1777                         }
1778                         periph->flags |= CAM_PERIPH_RECOVERY_INPROG;
1779                         scsi_test_unit_ready(&ccb->csio,
1780                                              retries,
1781                                              camperiphdone,
1782                                              MSG_SIMPLE_Q_TAG,
1783                                              SSD_FULL_SIZE,
1784                                              /*timeout*/5000);
1785
1786                         /*
1787                          * Accomplish our 500ms delay by deferring
1788                          * the release of our device queue appropriately.
1789                          */
1790                         *relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
1791                         *timeout = 500;
1792                         break;
1793                 }
1794                 default:
1795                         panic("Unhandled error action %x", err_action);
1796                 }
1797
1798                 if ((err_action & SS_MASK) >= SS_START) {
1799                         /*
1800                          * Drop the priority, so that the recovery
1801                          * CCB is the first to execute.  Freeze the queue
1802                          * after this command is sent so that we can
1803                          * restore the old csio and have it queued in
1804                          * the proper order before we release normal
1805                          * transactions to the device.
1806                          */
1807                         ccb->ccb_h.pinfo.priority--;
1808                         ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
1809                         ccb->ccb_h.saved_ccb_ptr = orig_ccb;
1810                         error = ERESTART;
1811                         *orig = orig_ccb;
1812                 }
1813
1814 sense_error_done:
1815                 *action = err_action;
1816         }
1817         return (error);
1818 }
1819
1820 /*
1821  * Generic error handler.  Peripheral drivers usually filter
1822  * out the errors that they handle in a unique manner, then
1823  * call this function.
1824  */
1825 int
1826 cam_periph_error(union ccb *ccb, cam_flags camflags,
1827                  u_int32_t sense_flags)
1828 {
1829         struct cam_path *newpath;
1830         union ccb  *orig_ccb, *scan_ccb;
1831         struct cam_periph *periph;
1832         const char *action_string;
1833         cam_status  status;
1834         int         frozen, error, openings, devctl_err;
1835         u_int32_t   action, relsim_flags, timeout;
1836
1837         action = SSQ_PRINT_SENSE;
1838         periph = xpt_path_periph(ccb->ccb_h.path);
1839         action_string = NULL;
1840         status = ccb->ccb_h.status;
1841         frozen = (status & CAM_DEV_QFRZN) != 0;
1842         status &= CAM_STATUS_MASK;
1843         devctl_err = openings = relsim_flags = timeout = 0;
1844         orig_ccb = ccb;
1845
1846         /* Filter the errors that should be reported via devctl */
1847         switch (ccb->ccb_h.status & CAM_STATUS_MASK) {
1848         case CAM_CMD_TIMEOUT:
1849         case CAM_REQ_ABORTED:
1850         case CAM_REQ_CMP_ERR:
1851         case CAM_REQ_TERMIO:
1852         case CAM_UNREC_HBA_ERROR:
1853         case CAM_DATA_RUN_ERR:
1854         case CAM_SCSI_STATUS_ERROR:
1855         case CAM_ATA_STATUS_ERROR:
1856         case CAM_SMP_STATUS_ERROR:
1857                 devctl_err++;
1858                 break;
1859         default:
1860                 break;
1861         }
1862
1863         switch (status) {
1864         case CAM_REQ_CMP:
1865                 error = 0;
1866                 action &= ~SSQ_PRINT_SENSE;
1867                 break;
1868         case CAM_SCSI_STATUS_ERROR:
1869                 error = camperiphscsistatuserror(ccb, &orig_ccb,
1870                     camflags, sense_flags, &openings, &relsim_flags,
1871                     &timeout, &action, &action_string);
1872                 break;
1873         case CAM_AUTOSENSE_FAIL:
1874                 error = EIO;    /* we have to kill the command */
1875                 break;
1876         case CAM_UA_ABORT:
1877         case CAM_UA_TERMIO:
1878         case CAM_MSG_REJECT_REC:
1879                 /* XXX Don't know that these are correct */
1880                 error = EIO;
1881                 break;
1882         case CAM_SEL_TIMEOUT:
1883                 if ((camflags & CAM_RETRY_SELTO) != 0) {
1884                         if (ccb->ccb_h.retry_count > 0 &&
1885                             (periph->flags & CAM_PERIPH_INVALID) == 0) {
1886                                 ccb->ccb_h.retry_count--;
1887                                 error = ERESTART;
1888
1889                                 /*
1890                                  * Wait a bit to give the device
1891                                  * time to recover before we try again.
1892                                  */
1893                                 relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
1894                                 timeout = periph_selto_delay;
1895                                 break;
1896                         }
1897                         action_string = "Retries exhausted";
1898                 }
1899                 /* FALLTHROUGH */
1900         case CAM_DEV_NOT_THERE:
1901                 error = ENXIO;
1902                 action = SSQ_LOST;
1903                 break;
1904         case CAM_REQ_INVALID:
1905         case CAM_PATH_INVALID:
1906         case CAM_NO_HBA:
1907         case CAM_PROVIDE_FAIL:
1908         case CAM_REQ_TOO_BIG:
1909         case CAM_LUN_INVALID:
1910         case CAM_TID_INVALID:
1911         case CAM_FUNC_NOTAVAIL:
1912                 error = EINVAL;
1913                 break;
1914         case CAM_SCSI_BUS_RESET:
1915         case CAM_BDR_SENT:
1916                 /*
1917                  * Commands that repeatedly timeout and cause these
1918                  * kinds of error recovery actions, should return
1919                  * CAM_CMD_TIMEOUT, which allows us to safely assume
1920                  * that this command was an innocent bystander to
1921                  * these events and should be unconditionally
1922                  * retried.
1923                  */
1924         case CAM_REQUEUE_REQ:
1925                 /* Unconditional requeue if device is still there */
1926                 if (periph->flags & CAM_PERIPH_INVALID) {
1927                         action_string = "Periph was invalidated";
1928                         error = EIO;
1929                 } else if (sense_flags & SF_NO_RETRY) {
1930                         error = EIO;
1931                         action_string = "Retry was blocked";
1932                 } else {
1933                         error = ERESTART;
1934                         action &= ~SSQ_PRINT_SENSE;
1935                 }
1936                 break;
1937         case CAM_RESRC_UNAVAIL:
1938                 /* Wait a bit for the resource shortage to abate. */
1939                 timeout = periph_noresrc_delay;
1940                 /* FALLTHROUGH */
1941         case CAM_BUSY:
1942                 if (timeout == 0) {
1943                         /* Wait a bit for the busy condition to abate. */
1944                         timeout = periph_busy_delay;
1945                 }
1946                 relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
1947                 /* FALLTHROUGH */
1948         case CAM_ATA_STATUS_ERROR:
1949         case CAM_REQ_CMP_ERR:
1950         case CAM_CMD_TIMEOUT:
1951         case CAM_UNEXP_BUSFREE:
1952         case CAM_UNCOR_PARITY:
1953         case CAM_DATA_RUN_ERR:
1954         default:
1955                 if (periph->flags & CAM_PERIPH_INVALID) {
1956                         error = EIO;
1957                         action_string = "Periph was invalidated";
1958                 } else if (ccb->ccb_h.retry_count == 0) {
1959                         error = EIO;
1960                         action_string = "Retries exhausted";
1961                 } else if (sense_flags & SF_NO_RETRY) {
1962                         error = EIO;
1963                         action_string = "Retry was blocked";
1964                 } else {
1965                         ccb->ccb_h.retry_count--;
1966                         error = ERESTART;
1967                 }
1968                 break;
1969         }
1970
1971         if ((sense_flags & SF_PRINT_ALWAYS) ||
1972             CAM_DEBUGGED(ccb->ccb_h.path, CAM_DEBUG_INFO))
1973                 action |= SSQ_PRINT_SENSE;
1974         else if (sense_flags & SF_NO_PRINT)
1975                 action &= ~SSQ_PRINT_SENSE;
1976         if ((action & SSQ_PRINT_SENSE) != 0)
1977                 cam_error_print(orig_ccb, CAM_ESF_ALL, CAM_EPF_ALL);
1978         if (error != 0 && (action & SSQ_PRINT_SENSE) != 0) {
1979                 if (error != ERESTART) {
1980                         if (action_string == NULL)
1981                                 action_string = "Unretryable error";
1982                         xpt_print(ccb->ccb_h.path, "Error %d, %s\n",
1983                             error, action_string);
1984                 } else if (action_string != NULL)
1985                         xpt_print(ccb->ccb_h.path, "%s\n", action_string);
1986                 else {
1987                         xpt_print(ccb->ccb_h.path,
1988                             "Retrying command, %d more tries remain\n",
1989                             ccb->ccb_h.retry_count);
1990                 }
1991         }
1992
1993         if (devctl_err && (error != 0 || (action & SSQ_PRINT_SENSE) != 0))
1994                 cam_periph_devctl_notify(orig_ccb);
1995
1996         if ((action & SSQ_LOST) != 0) {
1997                 lun_id_t lun_id;
1998
1999                 /*
2000                  * For a selection timeout, we consider all of the LUNs on
2001                  * the target to be gone.  If the status is CAM_DEV_NOT_THERE,
2002                  * then we only get rid of the device(s) specified by the
2003                  * path in the original CCB.
2004                  */
2005                 if (status == CAM_SEL_TIMEOUT)
2006                         lun_id = CAM_LUN_WILDCARD;
2007                 else
2008                         lun_id = xpt_path_lun_id(ccb->ccb_h.path);
2009
2010                 /* Should we do more if we can't create the path?? */
2011                 if (xpt_create_path(&newpath, periph,
2012                                     xpt_path_path_id(ccb->ccb_h.path),
2013                                     xpt_path_target_id(ccb->ccb_h.path),
2014                                     lun_id) == CAM_REQ_CMP) {
2015                         /*
2016                          * Let peripheral drivers know that this
2017                          * device has gone away.
2018                          */
2019                         xpt_async(AC_LOST_DEVICE, newpath, NULL);
2020                         xpt_free_path(newpath);
2021                 }
2022         }
2023
2024         /* Broadcast UNIT ATTENTIONs to all periphs. */
2025         if ((action & SSQ_UA) != 0)
2026                 xpt_async(AC_UNIT_ATTENTION, orig_ccb->ccb_h.path, orig_ccb);
2027
2028         /* Rescan target on "Reported LUNs data has changed" */
2029         if ((action & SSQ_RESCAN) != 0) {
2030                 if (xpt_create_path(&newpath, NULL,
2031                                     xpt_path_path_id(ccb->ccb_h.path),
2032                                     xpt_path_target_id(ccb->ccb_h.path),
2033                                     CAM_LUN_WILDCARD) == CAM_REQ_CMP) {
2034                         scan_ccb = xpt_alloc_ccb_nowait();
2035                         if (scan_ccb != NULL) {
2036                                 scan_ccb->ccb_h.path = newpath;
2037                                 scan_ccb->ccb_h.func_code = XPT_SCAN_TGT;
2038                                 scan_ccb->crcn.flags = 0;
2039                                 xpt_rescan(scan_ccb);
2040                         } else {
2041                                 xpt_print(newpath,
2042                                     "Can't allocate CCB to rescan target\n");
2043                                 xpt_free_path(newpath);
2044                         }
2045                 }
2046         }
2047
2048         /* Attempt a retry */
2049         if (error == ERESTART || error == 0) {
2050                 if (frozen != 0)
2051                         ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
2052                 if (error == ERESTART)
2053                         xpt_action(ccb);
2054                 if (frozen != 0)
2055                         cam_release_devq(ccb->ccb_h.path,
2056                                          relsim_flags,
2057                                          openings,
2058                                          timeout,
2059                                          /*getcount_only*/0);
2060         }
2061
2062         return (error);
2063 }
2064
2065 #define CAM_PERIPH_DEVD_MSG_SIZE        256
2066
2067 static void
2068 cam_periph_devctl_notify(union ccb *ccb)
2069 {
2070         struct cam_periph *periph;
2071         struct ccb_getdev *cgd;
2072         struct sbuf sb;
2073         int serr, sk, asc, ascq;
2074         char *sbmsg, *type;
2075
2076         sbmsg = malloc(CAM_PERIPH_DEVD_MSG_SIZE, M_CAMPERIPH, M_NOWAIT);
2077         if (sbmsg == NULL)
2078                 return;
2079
2080         sbuf_new(&sb, sbmsg, CAM_PERIPH_DEVD_MSG_SIZE, SBUF_FIXEDLEN);
2081
2082         periph = xpt_path_periph(ccb->ccb_h.path);
2083         sbuf_printf(&sb, "device=%s%d ", periph->periph_name,
2084             periph->unit_number);
2085
2086         sbuf_printf(&sb, "serial=\"");
2087         if ((cgd = (struct ccb_getdev *)xpt_alloc_ccb_nowait()) != NULL) {
2088                 xpt_setup_ccb(&cgd->ccb_h, ccb->ccb_h.path,
2089                     CAM_PRIORITY_NORMAL);
2090                 cgd->ccb_h.func_code = XPT_GDEV_TYPE;
2091                 xpt_action((union ccb *)cgd);
2092
2093                 if (cgd->ccb_h.status == CAM_REQ_CMP)
2094                         sbuf_bcat(&sb, cgd->serial_num, cgd->serial_num_len);
2095                 xpt_free_ccb((union ccb *)cgd);
2096         }
2097         sbuf_printf(&sb, "\" ");
2098         sbuf_printf(&sb, "cam_status=\"0x%x\" ", ccb->ccb_h.status);
2099
2100         switch (ccb->ccb_h.status & CAM_STATUS_MASK) {
2101         case CAM_CMD_TIMEOUT:
2102                 sbuf_printf(&sb, "timeout=%d ", ccb->ccb_h.timeout);
2103                 type = "timeout";
2104                 break;
2105         case CAM_SCSI_STATUS_ERROR:
2106                 sbuf_printf(&sb, "scsi_status=%d ", ccb->csio.scsi_status);
2107                 if (scsi_extract_sense_ccb(ccb, &serr, &sk, &asc, &ascq))
2108                         sbuf_printf(&sb, "scsi_sense=\"%02x %02x %02x %02x\" ",
2109                             serr, sk, asc, ascq);
2110                 type = "error";
2111                 break;
2112         case CAM_ATA_STATUS_ERROR:
2113                 sbuf_printf(&sb, "RES=\"");
2114                 ata_res_sbuf(&ccb->ataio.res, &sb);
2115                 sbuf_printf(&sb, "\" ");
2116                 type = "error";
2117                 break;
2118         default:
2119                 type = "error";
2120                 break;
2121         }
2122
2123         if (ccb->ccb_h.func_code == XPT_SCSI_IO) {
2124                 sbuf_printf(&sb, "CDB=\"");
2125                 scsi_cdb_sbuf(scsiio_cdb_ptr(&ccb->csio), &sb);
2126                 sbuf_printf(&sb, "\" ");
2127         } else if (ccb->ccb_h.func_code == XPT_ATA_IO) {
2128                 sbuf_printf(&sb, "ACB=\"");
2129                 ata_cmd_sbuf(&ccb->ataio.cmd, &sb);
2130                 sbuf_printf(&sb, "\" ");
2131         }
2132
2133         if (sbuf_finish(&sb) == 0)
2134                 devctl_notify("CAM", "periph", type, sbuf_data(&sb));
2135         sbuf_delete(&sb);
2136         free(sbmsg, M_CAMPERIPH);
2137 }
2138
2139 /*
2140  * Sysctl to force an invalidation of the drive right now. Can be
2141  * called with CTLFLAG_MPSAFE since we take periph lock.
2142  */
2143 int
2144 cam_periph_invalidate_sysctl(SYSCTL_HANDLER_ARGS)
2145 {
2146         struct cam_periph *periph;
2147         int error, value;
2148
2149         periph = arg1;
2150         value = 0;
2151         error = sysctl_handle_int(oidp, &value, 0, req);
2152         if (error != 0 || req->newptr == NULL || value != 1)
2153                 return (error);
2154
2155         cam_periph_lock(periph);
2156         cam_periph_invalidate(periph);
2157         cam_periph_unlock(periph);
2158
2159         return (0);
2160 }