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, ("duplicate units on periph list"));
 283                 TAILQ_INSERT_BEFORE(cur_periph, periph, unit_links);
 284         } else {
 285                 TAILQ_INSERT_TAIL(&(*p_drv)->units, periph, unit_links);
 286                 (*p_drv)->generation++;
 287         }
 288         xpt_unlock_buses();
 289
 290         init_level++;
 291
 292         status = xpt_add_periph(periph);
 293         if (status != CAM_REQ_CMP)
 294                 goto failure;
 295
 296         init_level++;
 297         CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph created\n"));
 298
 299         status = periph_ctor(periph, arg);
 300
 301         if (status == CAM_REQ_CMP)
 302                 init_level++;
 303
 304 failure:
 305         switch (init_level) {
 306         case 4:
 307                 /* Initialized successfully */
 308                 break;
 309         case 3:
 310                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph destroyed\n"));
 311                 xpt_remove_periph(periph);
 312                 /* FALLTHROUGH */
 313         case 2:
 314                 xpt_lock_buses();
 315                 TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links);
 316                 xpt_unlock_buses();
 317                 xpt_free_path(periph->path);
 318                 /* FALLTHROUGH */
 319         case 1:
 320                 free(periph, M_CAMPERIPH);
 321                 /* FALLTHROUGH */
 322         case 0:
 323                 /* No cleanup to perform. */
 324                 break;
 325         default:
 326                 panic("%s: Unknown init level", __func__);
 327         }
 328         return(status);
 329 }
 330
 331 /*
 332  * Find a peripheral structure with the specified path, target, lun,
 333  * and (optionally) type.  If the name is NULL, this function will return
 334  * the first peripheral driver that matches the specified path.
 335  */
 336 struct cam_periph *
 337 cam_periph_find(struct cam_path *path, char *name)
 338 {
 339         struct periph_driver **p_drv;
 340         struct cam_periph *periph;
 341
 342         xpt_lock_buses();
 343         for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
 344                 if (name != NULL && (strcmp((*p_drv)->driver_name, name) != 0))
 345                         continue;
 346
 347                 TAILQ_FOREACH(periph, &(*p_drv)->units, unit_links) {
 348                         if (xpt_path_comp(periph->path, path) == 0) {
 349                                 xpt_unlock_buses();
 350                                 cam_periph_assert(periph, MA_OWNED);
 351                                 return(periph);
 352                         }
 353                 }
 354                 if (name != NULL) {
 355                         xpt_unlock_buses();
 356                         return(NULL);
 357                 }
 358         }
 359         xpt_unlock_buses();
 360         return(NULL);
 361 }
 362
 363 /*
 364  * Find peripheral driver instances attached to the specified path.
 365  */
 366 int
 367 cam_periph_list(struct cam_path *path, struct sbuf *sb)
 368 {
 369         struct sbuf local_sb;
 370         struct periph_driver **p_drv;
 371         struct cam_periph *periph;
 372         int count;
 373         int sbuf_alloc_len;
 374
 375         sbuf_alloc_len = 16;
 376 retry:
 377         sbuf_new(&local_sb, NULL, sbuf_alloc_len, SBUF_FIXEDLEN);
 378         count = 0;
 379         xpt_lock_buses();
 380         for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
 381                 TAILQ_FOREACH(periph, &(*p_drv)->units, unit_links) {
 382                         if (xpt_path_comp(periph->path, path) != 0)
 383                                 continue;
 384
 385                         if (sbuf_len(&local_sb) != 0)
 386                                 sbuf_cat(&local_sb, ",");
 387
 388                         sbuf_printf(&local_sb, "%s%d", periph->periph_name,
 389                                     periph->unit_number);
 390
 391                         if (sbuf_error(&local_sb) == ENOMEM) {
 392                                 sbuf_alloc_len *= 2;
 393                                 xpt_unlock_buses();
 394                                 sbuf_delete(&local_sb);
 395                                 goto retry;
 396                         }
 397                         count++;
 398                 }
 399         }
 400         xpt_unlock_buses();
 401         sbuf_finish(&local_sb);
 402         if (sbuf_len(sb) != 0)
 403                 sbuf_cat(sb, ",");
 404         sbuf_cat(sb, sbuf_data(&local_sb));
 405         sbuf_delete(&local_sb);
 406         return (count);
 407 }
 408
 409 int
 410 cam_periph_acquire(struct cam_periph *periph)
 411 {
 412         int status;
 413
 414         if (periph == NULL)
 415                 return (EINVAL);
 416
 417         status = ENOENT;
 418         xpt_lock_buses();
 419         if ((periph->flags & CAM_PERIPH_INVALID) == 0) {
 420                 periph->refcount++;
 421                 status = 0;
 422         }
 423         xpt_unlock_buses();
 424
 425         return (status);
 426 }
 427
 428 void
 429 cam_periph_doacquire(struct cam_periph *periph)
 430 {
 431
 432         xpt_lock_buses();
 433         KASSERT(periph->refcount >= 1,
 434             ("cam_periph_doacquire() with refcount == %d", periph->refcount));
 435         periph->refcount++;
 436         xpt_unlock_buses();
 437 }
 438
 439 void
 440 cam_periph_release_locked_buses(struct cam_periph *periph)
 441 {
 442
 443         cam_periph_assert(periph, MA_OWNED);
 444         KASSERT(periph->refcount >= 1, ("periph->refcount >= 1"));
 445         if (--periph->refcount == 0)
 446                 camperiphfree(periph);
 447 }
 448
 449 void
 450 cam_periph_release_locked(struct cam_periph *periph)
 451 {
 452
 453         if (periph == NULL)
 454                 return;
 455
 456         xpt_lock_buses();
 457         cam_periph_release_locked_buses(periph);
 458         xpt_unlock_buses();
 459 }
 460
 461 void
 462 cam_periph_release(struct cam_periph *periph)
 463 {
 464         struct mtx *mtx;
 465
 466         if (periph == NULL)
 467                 return;
 468
 469         cam_periph_assert(periph, MA_NOTOWNED);
 470         mtx = cam_periph_mtx(periph);
 471         mtx_lock(mtx);
 472         cam_periph_release_locked(periph);
 473         mtx_unlock(mtx);
 474 }
 475
 476 /*
 477  * hold/unhold act as mutual exclusion for sections of the code that
 478  * need to sleep and want to make sure that other sections that
 479  * will interfere are held off. This only protects exclusive sections
 480  * from each other.
 481  */
 482 int
 483 cam_periph_hold(struct cam_periph *periph, int priority)
 484 {
 485         int error;
 486
 487         /*
 488          * Increment the reference count on the peripheral
 489          * while we wait for our lock attempt to succeed
 490          * to ensure the peripheral doesn't disappear out
 491          * from user us while we sleep.
 492          */
 493
 494         if (cam_periph_acquire(periph) != 0)
 495                 return (ENXIO);
 496
 497         cam_periph_assert(periph, MA_OWNED);
 498         while ((periph->flags & CAM_PERIPH_LOCKED) != 0) {
 499                 periph->flags |= CAM_PERIPH_LOCK_WANTED;
 500                 if ((error = cam_periph_sleep(periph, periph, priority,
 501                     "caplck", 0)) != 0) {
 502                         cam_periph_release_locked(periph);
 503                         return (error);
 504                 }
 505                 if (periph->flags & CAM_PERIPH_INVALID) {
 506                         cam_periph_release_locked(periph);
 507                         return (ENXIO);
 508                 }
 509         }
 510
 511         periph->flags |= CAM_PERIPH_LOCKED;
 512         return (0);
 513 }
 514
 515 void
 516 cam_periph_unhold(struct cam_periph *periph)
 517 {
 518
 519         cam_periph_assert(periph, MA_OWNED);
 520
 521         periph->flags &= ~CAM_PERIPH_LOCKED;
 522         if ((periph->flags & CAM_PERIPH_LOCK_WANTED) != 0) {
 523                 periph->flags &= ~CAM_PERIPH_LOCK_WANTED;
 524                 wakeup(periph);
 525         }
 526
 527         cam_periph_release_locked(periph);
 528 }
 529
 530 /*
 531  * Look for the next unit number that is not currently in use for this
 532  * peripheral type starting at "newunit".  Also exclude unit numbers that
 533  * are reserved by for future "hardwiring" unless we already know that this
 534  * is a potential wired device.  Only assume that the device is "wired" the
 535  * first time through the loop since after that we'll be looking at unit
 536  * numbers that did not match a wiring entry.
 537  */
 538 static u_int
 539 camperiphnextunit(struct periph_driver *p_drv, u_int newunit, int wired,
 540                   path_id_t pathid, target_id_t target, lun_id_t lun)
 541 {
 542         struct  cam_periph *periph;
 543         char    *periph_name;
 544         int     i, val, dunit, r;
 545         const char *dname, *strval;
 546
 547         periph_name = p_drv->driver_name;
 548         for (;;newunit++) {
 549                 for (periph = TAILQ_FIRST(&p_drv->units);
 550                      periph != NULL && periph->unit_number != newunit;
 551                      periph = TAILQ_NEXT(periph, unit_links))
 552                         ;
 553
 554                 if (periph != NULL && periph->unit_number == newunit) {
 555                         if (wired != 0) {
 556                                 xpt_print(periph->path, "Duplicate Wired "
 557                                     "Device entry!\n");
 558                                 xpt_print(periph->path, "Second device (%s "
 559                                     "device at scbus%d target %d lun %d) will "
 560                                     "not be wired\n", periph_name, pathid,
 561                                     target, lun);
 562                                 wired = 0;
 563                         }
 564                         continue;
 565                 }
 566                 if (wired)
 567                         break;
 568
 569                 /*
 570                  * Don't match entries like "da 4" as a wired down
 571                  * device, but do match entries like "da 4 target 5"
 572                  * or even "da 4 scbus 1".
 573                  */
 574                 i = 0;
 575                 dname = periph_name;
 576                 for (;;) {
 577                         r = resource_find_dev(&i, dname, &dunit, NULL, NULL);
 578                         if (r != 0)
 579                                 break;
 580                         /* if no "target" and no specific scbus, skip */
 581                         if (resource_int_value(dname, dunit, "target", &val) &&
 582                             (resource_string_value(dname, dunit, "at",&strval)||
 583                              strcmp(strval, "scbus") == 0))
 584                                 continue;
 585                         if (newunit == dunit)
 586                                 break;
 587                 }
 588                 if (r != 0)
 589                         break;
 590         }
 591         return (newunit);
 592 }
 593
 594 static u_int
 595 camperiphunit(struct periph_driver *p_drv, path_id_t pathid,
 596               target_id_t target, lun_id_t lun)
 597 {
 598         u_int   unit;
 599         int     wired, i, val, dunit;
 600         const char *dname, *strval;
 601         char    pathbuf[32], *periph_name;
 602
 603         periph_name = p_drv->driver_name;
 604         snprintf(pathbuf, sizeof(pathbuf), "scbus%d", pathid);
 605         unit = 0;
 606         i = 0;
 607         dname = periph_name;
 608         for (wired = 0; resource_find_dev(&i, dname, &dunit, NULL, NULL) == 0;
 609              wired = 0) {
 610                 if (resource_string_value(dname, dunit, "at", &strval) == 0) {
 611                         if (strcmp(strval, pathbuf) != 0)
 612                                 continue;
 613                         wired++;
 614                 }
 615                 if (resource_int_value(dname, dunit, "target", &val) == 0) {
 616                         if (val != target)
 617                                 continue;
 618                         wired++;
 619                 }
 620                 if (resource_int_value(dname, dunit, "lun", &val) == 0) {
 621                         if (val != lun)
 622                                 continue;
 623                         wired++;
 624                 }
 625                 if (wired != 0) {
 626                         unit = dunit;
 627                         break;
 628                 }
 629         }
 630
 631         /*
 632          * Either start from 0 looking for the next unit or from
 633          * the unit number given in the resource config.  This way,
 634          * if we have wildcard matches, we don't return the same
 635          * unit number twice.
 636          */
 637         unit = camperiphnextunit(p_drv, unit, wired, pathid, target, lun);
 638
 639         return (unit);
 640 }
 641
 642 void
 643 cam_periph_invalidate(struct cam_periph *periph)
 644 {
 645
 646         cam_periph_assert(periph, MA_OWNED);
 647         /*
 648          * We only tear down the device the first time a peripheral is
 649          * invalidated.
 650          */
 651         if ((periph->flags & CAM_PERIPH_INVALID) != 0)
 652                 return;
 653
 654         CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph invalidated\n"));
 655         if ((periph->flags & CAM_PERIPH_ANNOUNCED) && !rebooting) {
 656                 struct sbuf sb;
 657                 char buffer[160];
 658
 659                 sbuf_new(&sb, buffer, 160, SBUF_FIXEDLEN);
 660                 xpt_denounce_periph_sbuf(periph, &sb);
 661                 sbuf_finish(&sb);
 662                 sbuf_putbuf(&sb);
 663         }
 664         periph->flags |= CAM_PERIPH_INVALID;
 665         periph->flags &= ~CAM_PERIPH_NEW_DEV_FOUND;
 666         if (periph->periph_oninval != NULL)
 667                 periph->periph_oninval(periph);
 668         cam_periph_release_locked(periph);
 669 }
 670
 671 static void
 672 camperiphfree(struct cam_periph *periph)
 673 {
 674         struct periph_driver **p_drv;
 675         struct periph_driver *drv;
 676
 677         cam_periph_assert(periph, MA_OWNED);
 678         KASSERT(periph->periph_allocating == 0, ("%s%d: freed while allocating",
 679             periph->periph_name, periph->unit_number));
 680         for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
 681                 if (strcmp((*p_drv)->driver_name, periph->periph_name) == 0)
 682                         break;
 683         }
 684         if (*p_drv == NULL) {
 685                 printf("camperiphfree: attempt to free non-existant periph\n");
 686                 return;
 687         }
 688         /*
 689          * Cache a pointer to the periph_driver structure.  If a
 690          * periph_driver is added or removed from the array (see
 691          * periphdriver_register()) while we drop the toplogy lock
 692          * below, p_drv may change.  This doesn't protect against this
 693          * particular periph_driver going away.  That will require full
 694          * reference counting in the periph_driver infrastructure.
 695          */
 696         drv = *p_drv;
 697
 698         /*
 699          * We need to set this flag before dropping the topology lock, to
 700          * let anyone who is traversing the list that this peripheral is
 701          * about to be freed, and there will be no more reference count
 702          * checks.
 703          */
 704         periph->flags |= CAM_PERIPH_FREE;
 705
 706         /*
 707          * The peripheral destructor semantics dictate calling with only the
 708          * SIM mutex held.  Since it might sleep, it should not be called
 709          * with the topology lock held.
 710          */
 711         xpt_unlock_buses();
 712
 713         /*
 714          * We need to call the peripheral destructor prior to removing the
 715          * peripheral from the list.  Otherwise, we risk running into a
 716          * scenario where the peripheral unit number may get reused
 717          * (because it has been removed from the list), but some resources
 718          * used by the peripheral are still hanging around.  In particular,
 719          * the devfs nodes used by some peripherals like the pass(4) driver
 720          * aren't fully cleaned up until the destructor is run.  If the
 721          * unit number is reused before the devfs instance is fully gone,
 722          * devfs will panic.
 723          */
 724         if (periph->periph_dtor != NULL)
 725                 periph->periph_dtor(periph);
 726
 727         /*
 728          * The peripheral list is protected by the topology lock. We have to
 729          * remove the periph from the drv list before we call deferred_ac. The
 730          * AC_FOUND_DEVICE callback won't create a new periph if it's still there.
 731          */
 732         xpt_lock_buses();
 733
 734         TAILQ_REMOVE(&drv->units, periph, unit_links);
 735         drv->generation++;
 736
 737         xpt_remove_periph(periph);
 738
 739         xpt_unlock_buses();
 740         if ((periph->flags & CAM_PERIPH_ANNOUNCED) && !rebooting)
 741                 xpt_print(periph->path, "Periph destroyed\n");
 742         else
 743                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph destroyed\n"));
 744
 745         if (periph->flags & CAM_PERIPH_NEW_DEV_FOUND) {
 746                 union ccb ccb;
 747                 void *arg;
 748
 749                 memset(&ccb, 0, sizeof(ccb));
 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         memset(&ccb_h, 0, sizeof(ccb_h));
1323         xpt_setup_ccb(&ccb_h, path, /*priority*/1);
1324         ccb_h.func_code = XPT_NOOP;
1325         ccb_h.flags = CAM_DEV_QFREEZE;
1326         xpt_action((union ccb *)&ccb_h);
1327 }
1328
1329 u_int32_t
1330 cam_release_devq(struct cam_path *path, u_int32_t relsim_flags,
1331                  u_int32_t openings, u_int32_t arg,
1332                  int getcount_only)
1333 {
1334         struct ccb_relsim crs;
1335
1336         CAM_DEBUG(path, CAM_DEBUG_TRACE, ("cam_release_devq(%u, %u, %u, %d)\n",
1337             relsim_flags, openings, arg, getcount_only));
1338         memset(&crs, 0, sizeof(crs));
1339         xpt_setup_ccb(&crs.ccb_h, path, CAM_PRIORITY_NORMAL);
1340         crs.ccb_h.func_code = XPT_REL_SIMQ;
1341         crs.ccb_h.flags = getcount_only ? CAM_DEV_QFREEZE : 0;
1342         crs.release_flags = relsim_flags;
1343         crs.openings = openings;
1344         crs.release_timeout = arg;
1345         xpt_action((union ccb *)&crs);
1346         return (crs.qfrozen_cnt);
1347 }
1348
1349 #define saved_ccb_ptr ppriv_ptr0
1350 static void
1351 camperiphdone(struct cam_periph *periph, union ccb *done_ccb)
1352 {
1353         union ccb      *saved_ccb;
1354         cam_status      status;
1355         struct scsi_start_stop_unit *scsi_cmd;
1356         int             error = 0, error_code, sense_key, asc, ascq;
1357
1358         scsi_cmd = (struct scsi_start_stop_unit *)
1359             &done_ccb->csio.cdb_io.cdb_bytes;
1360         status = done_ccb->ccb_h.status;
1361
1362         if ((status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
1363                 if (scsi_extract_sense_ccb(done_ccb,
1364                     &error_code, &sense_key, &asc, &ascq)) {
1365                         /*
1366                          * If the error is "invalid field in CDB",
1367                          * and the load/eject flag is set, turn the
1368                          * flag off and try again.  This is just in
1369                          * case the drive in question barfs on the
1370                          * load eject flag.  The CAM code should set
1371                          * the load/eject flag by default for
1372                          * removable media.
1373                          */
1374                         if ((scsi_cmd->opcode == START_STOP_UNIT) &&
1375                             ((scsi_cmd->how & SSS_LOEJ) != 0) &&
1376                              (asc == 0x24) && (ascq == 0x00)) {
1377                                 scsi_cmd->how &= ~SSS_LOEJ;
1378                                 if (status & CAM_DEV_QFRZN) {
1379                                         cam_release_devq(done_ccb->ccb_h.path,
1380                                             0, 0, 0, 0);
1381                                         done_ccb->ccb_h.status &=
1382                                             ~CAM_DEV_QFRZN;
1383                                 }
1384                                 xpt_action(done_ccb);
1385                                 goto out;
1386                         }
1387                 }
1388                 error = cam_periph_error(done_ccb, 0,
1389                     SF_RETRY_UA | SF_NO_PRINT);
1390                 if (error == ERESTART)
1391                         goto out;
1392                 if (done_ccb->ccb_h.status & CAM_DEV_QFRZN) {
1393                         cam_release_devq(done_ccb->ccb_h.path, 0, 0, 0, 0);
1394                         done_ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
1395                 }
1396         } else {
1397                 /*
1398                  * If we have successfully taken a device from the not
1399                  * ready to ready state, re-scan the device and re-get
1400                  * the inquiry information.  Many devices (mostly disks)
1401                  * don't properly report their inquiry information unless
1402                  * they are spun up.
1403                  */
1404                 if (scsi_cmd->opcode == START_STOP_UNIT)
1405                         xpt_async(AC_INQ_CHANGED, done_ccb->ccb_h.path, NULL);
1406         }
1407
1408         /* If we tried long wait and still failed, remember that. */
1409         if ((periph->flags & CAM_PERIPH_RECOVERY_WAIT) &&
1410             (done_ccb->csio.cdb_io.cdb_bytes[0] == TEST_UNIT_READY)) {
1411                 periph->flags &= ~CAM_PERIPH_RECOVERY_WAIT;
1412                 if (error != 0 && done_ccb->ccb_h.retry_count == 0)
1413                         periph->flags |= CAM_PERIPH_RECOVERY_WAIT_FAILED;
1414         }
1415
1416         /*
1417          * After recovery action(s) completed, return to the original CCB.
1418          * If the recovery CCB has failed, considering its own possible
1419          * retries and recovery, assume we are back in state where we have
1420          * been originally, but without recovery hopes left.  In such case,
1421          * after the final attempt below, we cancel any further retries,
1422          * blocking by that also any new recovery attempts for this CCB,
1423          * and the result will be the final one returned to the CCB owher.
1424          */
1425         saved_ccb = (union ccb *)done_ccb->ccb_h.saved_ccb_ptr;
1426         bcopy(saved_ccb, done_ccb, sizeof(*done_ccb));
1427         xpt_free_ccb(saved_ccb);
1428         if (done_ccb->ccb_h.cbfcnp != camperiphdone)
1429                 periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG;
1430         if (error != 0)
1431                 done_ccb->ccb_h.retry_count = 0;
1432         xpt_action(done_ccb);
1433
1434 out:
1435         /* Drop freeze taken due to CAM_DEV_QFREEZE flag set. */
1436         cam_release_devq(done_ccb->ccb_h.path, 0, 0, 0, 0);
1437 }
1438
1439 /*
1440  * Generic Async Event handler.  Peripheral drivers usually
1441  * filter out the events that require personal attention,
1442  * and leave the rest to this function.
1443  */
1444 void
1445 cam_periph_async(struct cam_periph *periph, u_int32_t code,
1446                  struct cam_path *path, void *arg)
1447 {
1448         switch (code) {
1449         case AC_LOST_DEVICE:
1450                 cam_periph_invalidate(periph);
1451                 break;
1452         default:
1453                 break;
1454         }
1455 }
1456
1457 void
1458 cam_periph_bus_settle(struct cam_periph *periph, u_int bus_settle)
1459 {
1460         struct ccb_getdevstats cgds;
1461
1462         memset(&cgds, 0, sizeof(cgds));
1463         xpt_setup_ccb(&cgds.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
1464         cgds.ccb_h.func_code = XPT_GDEV_STATS;
1465         xpt_action((union ccb *)&cgds);
1466         cam_periph_freeze_after_event(periph, &cgds.last_reset, bus_settle);
1467 }
1468
1469 void
1470 cam_periph_freeze_after_event(struct cam_periph *periph,
1471                               struct timeval* event_time, u_int duration_ms)
1472 {
1473         struct timeval delta;
1474         struct timeval duration_tv;
1475
1476         if (!timevalisset(event_time))
1477                 return;
1478
1479         microtime(&delta);
1480         timevalsub(&delta, event_time);
1481         duration_tv.tv_sec = duration_ms / 1000;
1482         duration_tv.tv_usec = (duration_ms % 1000) * 1000;
1483         if (timevalcmp(&delta, &duration_tv, <)) {
1484                 timevalsub(&duration_tv, &delta);
1485
1486                 duration_ms = duration_tv.tv_sec * 1000;
1487                 duration_ms += duration_tv.tv_usec / 1000;
1488                 cam_freeze_devq(periph->path);
1489                 cam_release_devq(periph->path,
1490                                 RELSIM_RELEASE_AFTER_TIMEOUT,
1491                                 /*reduction*/0,
1492                                 /*timeout*/duration_ms,
1493                                 /*getcount_only*/0);
1494         }
1495
1496 }
1497
1498 static int
1499 camperiphscsistatuserror(union ccb *ccb, union ccb **orig_ccb,
1500     cam_flags camflags, u_int32_t sense_flags,
1501     int *openings, u_int32_t *relsim_flags,
1502     u_int32_t *timeout, u_int32_t *action, const char **action_string)
1503 {
1504         struct cam_periph *periph;
1505         int error;
1506
1507         switch (ccb->csio.scsi_status) {
1508         case SCSI_STATUS_OK:
1509         case SCSI_STATUS_COND_MET:
1510         case SCSI_STATUS_INTERMED:
1511         case SCSI_STATUS_INTERMED_COND_MET:
1512                 error = 0;
1513                 break;
1514         case SCSI_STATUS_CMD_TERMINATED:
1515         case SCSI_STATUS_CHECK_COND:
1516                 error = camperiphscsisenseerror(ccb, orig_ccb,
1517                                                 camflags,
1518                                                 sense_flags,
1519                                                 openings,
1520                                                 relsim_flags,
1521                                                 timeout,
1522                                                 action,
1523                                                 action_string);
1524                 break;
1525         case SCSI_STATUS_QUEUE_FULL:
1526         {
1527                 /* no decrement */
1528                 struct ccb_getdevstats cgds;
1529
1530                 /*
1531                  * First off, find out what the current
1532                  * transaction counts are.
1533                  */
1534                 memset(&cgds, 0, sizeof(cgds));
1535                 xpt_setup_ccb(&cgds.ccb_h,
1536                               ccb->ccb_h.path,
1537                               CAM_PRIORITY_NORMAL);
1538                 cgds.ccb_h.func_code = XPT_GDEV_STATS;
1539                 xpt_action((union ccb *)&cgds);
1540
1541                 /*
1542                  * If we were the only transaction active, treat
1543                  * the QUEUE FULL as if it were a BUSY condition.
1544                  */
1545                 if (cgds.dev_active != 0) {
1546                         int total_openings;
1547
1548                         /*
1549                          * Reduce the number of openings to
1550                          * be 1 less than the amount it took
1551                          * to get a queue full bounded by the
1552                          * minimum allowed tag count for this
1553                          * device.
1554                          */
1555                         total_openings = cgds.dev_active + cgds.dev_openings;
1556                         *openings = cgds.dev_active;
1557                         if (*openings < cgds.mintags)
1558                                 *openings = cgds.mintags;
1559                         if (*openings < total_openings)
1560                                 *relsim_flags = RELSIM_ADJUST_OPENINGS;
1561                         else {
1562                                 /*
1563                                  * Some devices report queue full for
1564                                  * temporary resource shortages.  For
1565                                  * this reason, we allow a minimum
1566                                  * tag count to be entered via a
1567                                  * quirk entry to prevent the queue
1568                                  * count on these devices from falling
1569                                  * to a pessimisticly low value.  We
1570                                  * still wait for the next successful
1571                                  * completion, however, before queueing
1572                                  * more transactions to the device.
1573                                  */
1574                                 *relsim_flags = RELSIM_RELEASE_AFTER_CMDCMPLT;
1575                         }
1576                         *timeout = 0;
1577                         error = ERESTART;
1578                         *action &= ~SSQ_PRINT_SENSE;
1579                         break;
1580                 }
1581                 /* FALLTHROUGH */
1582         }
1583         case SCSI_STATUS_BUSY:
1584                 /*
1585                  * Restart the queue after either another
1586                  * command completes or a 1 second timeout.
1587                  */
1588                 periph = xpt_path_periph(ccb->ccb_h.path);
1589                 if (periph->flags & CAM_PERIPH_INVALID) {
1590                         error = EIO;
1591                         *action_string = "Periph was invalidated";
1592                 } else if ((sense_flags & SF_RETRY_BUSY) != 0 ||
1593                     ccb->ccb_h.retry_count > 0) {
1594                         if ((sense_flags & SF_RETRY_BUSY) == 0)
1595                                 ccb->ccb_h.retry_count--;
1596                         error = ERESTART;
1597                         *relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT
1598                                       | RELSIM_RELEASE_AFTER_CMDCMPLT;
1599                         *timeout = 1000;
1600                 } else {
1601                         error = EIO;
1602                         *action_string = "Retries exhausted";
1603                 }
1604                 break;
1605         case SCSI_STATUS_RESERV_CONFLICT:
1606         default:
1607                 error = EIO;
1608                 break;
1609         }
1610         return (error);
1611 }
1612
1613 static int
1614 camperiphscsisenseerror(union ccb *ccb, union ccb **orig,
1615     cam_flags camflags, u_int32_t sense_flags,
1616     int *openings, u_int32_t *relsim_flags,
1617     u_int32_t *timeout, u_int32_t *action, const char **action_string)
1618 {
1619         struct cam_periph *periph;
1620         union ccb *orig_ccb = ccb;
1621         int error, recoveryccb;
1622
1623 #if defined(BUF_TRACKING) || defined(FULL_BUF_TRACKING)
1624         if (ccb->ccb_h.func_code == XPT_SCSI_IO && ccb->csio.bio != NULL)
1625                 biotrack(ccb->csio.bio, __func__);
1626 #endif
1627
1628         periph = xpt_path_periph(ccb->ccb_h.path);
1629         recoveryccb = (ccb->ccb_h.cbfcnp == camperiphdone);
1630         if ((periph->flags & CAM_PERIPH_RECOVERY_INPROG) && !recoveryccb) {
1631                 /*
1632                  * If error recovery is already in progress, don't attempt
1633                  * to process this error, but requeue it unconditionally
1634                  * and attempt to process it once error recovery has
1635                  * completed.  This failed command is probably related to
1636                  * the error that caused the currently active error recovery
1637                  * action so our  current recovery efforts should also
1638                  * address this command.  Be aware that the error recovery
1639                  * code assumes that only one recovery action is in progress
1640                  * on a particular peripheral instance at any given time
1641                  * (e.g. only one saved CCB for error recovery) so it is
1642                  * imperitive that we don't violate this assumption.
1643                  */
1644                 error = ERESTART;
1645                 *action &= ~SSQ_PRINT_SENSE;
1646         } else {
1647                 scsi_sense_action err_action;
1648                 struct ccb_getdev cgd;
1649
1650                 /*
1651                  * Grab the inquiry data for this device.
1652                  */
1653                 memset(&cgd, 0, sizeof(cgd));
1654                 xpt_setup_ccb(&cgd.ccb_h, ccb->ccb_h.path, CAM_PRIORITY_NORMAL);
1655                 cgd.ccb_h.func_code = XPT_GDEV_TYPE;
1656                 xpt_action((union ccb *)&cgd);
1657
1658                 err_action = scsi_error_action(&ccb->csio, &cgd.inq_data,
1659                     sense_flags);
1660                 error = err_action & SS_ERRMASK;
1661
1662                 /*
1663                  * Do not autostart sequential access devices
1664                  * to avoid unexpected tape loading.
1665                  */
1666                 if ((err_action & SS_MASK) == SS_START &&
1667                     SID_TYPE(&cgd.inq_data) == T_SEQUENTIAL) {
1668                         *action_string = "Will not autostart a "
1669                             "sequential access device";
1670                         goto sense_error_done;
1671                 }
1672
1673                 /*
1674                  * Avoid recovery recursion if recovery action is the same.
1675                  */
1676                 if ((err_action & SS_MASK) >= SS_START && recoveryccb) {
1677                         if (((err_action & SS_MASK) == SS_START &&
1678                              ccb->csio.cdb_io.cdb_bytes[0] == START_STOP_UNIT) ||
1679                             ((err_action & SS_MASK) == SS_TUR &&
1680                              (ccb->csio.cdb_io.cdb_bytes[0] == TEST_UNIT_READY))) {
1681                                 err_action = SS_RETRY|SSQ_DECREMENT_COUNT|EIO;
1682                                 *relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
1683                                 *timeout = 500;
1684                         }
1685                 }
1686
1687                 /*
1688                  * If the recovery action will consume a retry,
1689                  * make sure we actually have retries available.
1690                  */
1691                 if ((err_action & SSQ_DECREMENT_COUNT) != 0) {
1692                         if (ccb->ccb_h.retry_count > 0 &&
1693                             (periph->flags & CAM_PERIPH_INVALID) == 0)
1694                                 ccb->ccb_h.retry_count--;
1695                         else {
1696                                 *action_string = "Retries exhausted";
1697                                 goto sense_error_done;
1698                         }
1699                 }
1700
1701                 if ((err_action & SS_MASK) >= SS_START) {
1702                         /*
1703                          * Do common portions of commands that
1704                          * use recovery CCBs.
1705                          */
1706                         orig_ccb = xpt_alloc_ccb_nowait();
1707                         if (orig_ccb == NULL) {
1708                                 *action_string = "Can't allocate recovery CCB";
1709                                 goto sense_error_done;
1710                         }
1711                         /*
1712                          * Clear freeze flag for original request here, as
1713                          * this freeze will be dropped as part of ERESTART.
1714                          */
1715                         ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
1716                         bcopy(ccb, orig_ccb, sizeof(*orig_ccb));
1717                 }
1718
1719                 switch (err_action & SS_MASK) {
1720                 case SS_NOP:
1721                         *action_string = "No recovery action needed";
1722                         error = 0;
1723                         break;
1724                 case SS_RETRY:
1725                         *action_string = "Retrying command (per sense data)";
1726                         error = ERESTART;
1727                         break;
1728                 case SS_FAIL:
1729                         *action_string = "Unretryable error";
1730                         break;
1731                 case SS_START:
1732                 {
1733                         int le;
1734
1735                         /*
1736                          * Send a start unit command to the device, and
1737                          * then retry the command.
1738                          */
1739                         *action_string = "Attempting to start unit";
1740                         periph->flags |= CAM_PERIPH_RECOVERY_INPROG;
1741
1742                         /*
1743                          * Check for removable media and set
1744                          * load/eject flag appropriately.
1745                          */
1746                         if (SID_IS_REMOVABLE(&cgd.inq_data))
1747                                 le = TRUE;
1748                         else
1749                                 le = FALSE;
1750
1751                         scsi_start_stop(&ccb->csio,
1752                                         /*retries*/1,
1753                                         camperiphdone,
1754                                         MSG_SIMPLE_Q_TAG,
1755                                         /*start*/TRUE,
1756                                         /*load/eject*/le,
1757                                         /*immediate*/FALSE,
1758                                         SSD_FULL_SIZE,
1759                                         /*timeout*/50000);
1760                         break;
1761                 }
1762                 case SS_TUR:
1763                 {
1764                         /*
1765                          * Send a Test Unit Ready to the device.
1766                          * If the 'many' flag is set, we send 120
1767                          * test unit ready commands, one every half
1768                          * second.  Otherwise, we just send one TUR.
1769                          * We only want to do this if the retry
1770                          * count has not been exhausted.
1771                          */
1772                         int retries;
1773
1774                         if ((err_action & SSQ_MANY) != 0 && (periph->flags &
1775                              CAM_PERIPH_RECOVERY_WAIT_FAILED) == 0) {
1776                                 periph->flags |= CAM_PERIPH_RECOVERY_WAIT;
1777                                 *action_string = "Polling device for readiness";
1778                                 retries = 120;
1779                         } else {
1780                                 *action_string = "Testing device for readiness";
1781                                 retries = 1;
1782                         }
1783                         periph->flags |= CAM_PERIPH_RECOVERY_INPROG;
1784                         scsi_test_unit_ready(&ccb->csio,
1785                                              retries,
1786                                              camperiphdone,
1787                                              MSG_SIMPLE_Q_TAG,
1788                                              SSD_FULL_SIZE,
1789                                              /*timeout*/5000);
1790
1791                         /*
1792                          * Accomplish our 500ms delay by deferring
1793                          * the release of our device queue appropriately.
1794                          */
1795                         *relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
1796                         *timeout = 500;
1797                         break;
1798                 }
1799                 default:
1800                         panic("Unhandled error action %x", err_action);
1801                 }
1802
1803                 if ((err_action & SS_MASK) >= SS_START) {
1804                         /*
1805                          * Drop the priority, so that the recovery
1806                          * CCB is the first to execute.  Freeze the queue
1807                          * after this command is sent so that we can
1808                          * restore the old csio and have it queued in
1809                          * the proper order before we release normal
1810                          * transactions to the device.
1811                          */
1812                         ccb->ccb_h.pinfo.priority--;
1813                         ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
1814                         ccb->ccb_h.saved_ccb_ptr = orig_ccb;
1815                         error = ERESTART;
1816                         *orig = orig_ccb;
1817                 }
1818
1819 sense_error_done:
1820                 *action = err_action;
1821         }
1822         return (error);
1823 }
1824
1825 /*
1826  * Generic error handler.  Peripheral drivers usually filter
1827  * out the errors that they handle in a unique manner, then
1828  * call this function.
1829  */
1830 int
1831 cam_periph_error(union ccb *ccb, cam_flags camflags,
1832                  u_int32_t sense_flags)
1833 {
1834         struct cam_path *newpath;
1835         union ccb  *orig_ccb, *scan_ccb;
1836         struct cam_periph *periph;
1837         const char *action_string;
1838         cam_status  status;
1839         int         frozen, error, openings, devctl_err;
1840         u_int32_t   action, relsim_flags, timeout;
1841
1842         action = SSQ_PRINT_SENSE;
1843         periph = xpt_path_periph(ccb->ccb_h.path);
1844         action_string = NULL;
1845         status = ccb->ccb_h.status;
1846         frozen = (status & CAM_DEV_QFRZN) != 0;
1847         status &= CAM_STATUS_MASK;
1848         devctl_err = openings = relsim_flags = timeout = 0;
1849         orig_ccb = ccb;
1850
1851         /* Filter the errors that should be reported via devctl */
1852         switch (ccb->ccb_h.status & CAM_STATUS_MASK) {
1853         case CAM_CMD_TIMEOUT:
1854         case CAM_REQ_ABORTED:
1855         case CAM_REQ_CMP_ERR:
1856         case CAM_REQ_TERMIO:
1857         case CAM_UNREC_HBA_ERROR:
1858         case CAM_DATA_RUN_ERR:
1859         case CAM_SCSI_STATUS_ERROR:
1860         case CAM_ATA_STATUS_ERROR:
1861         case CAM_SMP_STATUS_ERROR:
1862                 devctl_err++;
1863                 break;
1864         default:
1865                 break;
1866         }
1867
1868         switch (status) {
1869         case CAM_REQ_CMP:
1870                 error = 0;
1871                 action &= ~SSQ_PRINT_SENSE;
1872                 break;
1873         case CAM_SCSI_STATUS_ERROR:
1874                 error = camperiphscsistatuserror(ccb, &orig_ccb,
1875                     camflags, sense_flags, &openings, &relsim_flags,
1876                     &timeout, &action, &action_string);
1877                 break;
1878         case CAM_AUTOSENSE_FAIL:
1879                 error = EIO;    /* we have to kill the command */
1880                 break;
1881         case CAM_UA_ABORT:
1882         case CAM_UA_TERMIO:
1883         case CAM_MSG_REJECT_REC:
1884                 /* XXX Don't know that these are correct */
1885                 error = EIO;
1886                 break;
1887         case CAM_SEL_TIMEOUT:
1888                 if ((camflags & CAM_RETRY_SELTO) != 0) {
1889                         if (ccb->ccb_h.retry_count > 0 &&
1890                             (periph->flags & CAM_PERIPH_INVALID) == 0) {
1891                                 ccb->ccb_h.retry_count--;
1892                                 error = ERESTART;
1893
1894                                 /*
1895                                  * Wait a bit to give the device
1896                                  * time to recover before we try again.
1897                                  */
1898                                 relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
1899                                 timeout = periph_selto_delay;
1900                                 break;
1901                         }
1902                         action_string = "Retries exhausted";
1903                 }
1904                 /* FALLTHROUGH */
1905         case CAM_DEV_NOT_THERE:
1906                 error = ENXIO;
1907                 action = SSQ_LOST;
1908                 break;
1909         case CAM_REQ_INVALID:
1910         case CAM_PATH_INVALID:
1911         case CAM_NO_HBA:
1912         case CAM_PROVIDE_FAIL:
1913         case CAM_REQ_TOO_BIG:
1914         case CAM_LUN_INVALID:
1915         case CAM_TID_INVALID:
1916         case CAM_FUNC_NOTAVAIL:
1917                 error = EINVAL;
1918                 break;
1919         case CAM_SCSI_BUS_RESET:
1920         case CAM_BDR_SENT:
1921                 /*
1922                  * Commands that repeatedly timeout and cause these
1923                  * kinds of error recovery actions, should return
1924                  * CAM_CMD_TIMEOUT, which allows us to safely assume
1925                  * that this command was an innocent bystander to
1926                  * these events and should be unconditionally
1927                  * retried.
1928                  */
1929         case CAM_REQUEUE_REQ:
1930                 /* Unconditional requeue if device is still there */
1931                 if (periph->flags & CAM_PERIPH_INVALID) {
1932                         action_string = "Periph was invalidated";
1933                         error = EIO;
1934                 } else if (sense_flags & SF_NO_RETRY) {
1935                         error = EIO;
1936                         action_string = "Retry was blocked";
1937                 } else {
1938                         error = ERESTART;
1939                         action &= ~SSQ_PRINT_SENSE;
1940                 }
1941                 break;
1942         case CAM_RESRC_UNAVAIL:
1943                 /* Wait a bit for the resource shortage to abate. */
1944                 timeout = periph_noresrc_delay;
1945                 /* FALLTHROUGH */
1946         case CAM_BUSY:
1947                 if (timeout == 0) {
1948                         /* Wait a bit for the busy condition to abate. */
1949                         timeout = periph_busy_delay;
1950                 }
1951                 relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
1952                 /* FALLTHROUGH */
1953         case CAM_ATA_STATUS_ERROR:
1954         case CAM_REQ_CMP_ERR:
1955         case CAM_CMD_TIMEOUT:
1956         case CAM_UNEXP_BUSFREE:
1957         case CAM_UNCOR_PARITY:
1958         case CAM_DATA_RUN_ERR:
1959         default:
1960                 if (periph->flags & CAM_PERIPH_INVALID) {
1961                         error = EIO;
1962                         action_string = "Periph was invalidated";
1963                 } else if (ccb->ccb_h.retry_count == 0) {
1964                         error = EIO;
1965                         action_string = "Retries exhausted";
1966                 } else if (sense_flags & SF_NO_RETRY) {
1967                         error = EIO;
1968                         action_string = "Retry was blocked";
1969                 } else {
1970                         ccb->ccb_h.retry_count--;
1971                         error = ERESTART;
1972                 }
1973                 break;
1974         }
1975
1976         if ((sense_flags & SF_PRINT_ALWAYS) ||
1977             CAM_DEBUGGED(ccb->ccb_h.path, CAM_DEBUG_INFO))
1978                 action |= SSQ_PRINT_SENSE;
1979         else if (sense_flags & SF_NO_PRINT)
1980                 action &= ~SSQ_PRINT_SENSE;
1981         if ((action & SSQ_PRINT_SENSE) != 0)
1982                 cam_error_print(orig_ccb, CAM_ESF_ALL, CAM_EPF_ALL);
1983         if (error != 0 && (action & SSQ_PRINT_SENSE) != 0) {
1984                 if (error != ERESTART) {
1985                         if (action_string == NULL)
1986                                 action_string = "Unretryable error";
1987                         xpt_print(ccb->ccb_h.path, "Error %d, %s\n",
1988                             error, action_string);
1989                 } else if (action_string != NULL)
1990                         xpt_print(ccb->ccb_h.path, "%s\n", action_string);
1991                 else {
1992                         xpt_print(ccb->ccb_h.path,
1993                             "Retrying command, %d more tries remain\n",
1994                             ccb->ccb_h.retry_count);
1995                 }
1996         }
1997
1998         if (devctl_err && (error != 0 || (action & SSQ_PRINT_SENSE) != 0))
1999                 cam_periph_devctl_notify(orig_ccb);
2000
2001         if ((action & SSQ_LOST) != 0) {
2002                 lun_id_t lun_id;
2003
2004                 /*
2005                  * For a selection timeout, we consider all of the LUNs on
2006                  * the target to be gone.  If the status is CAM_DEV_NOT_THERE,
2007                  * then we only get rid of the device(s) specified by the
2008                  * path in the original CCB.
2009                  */
2010                 if (status == CAM_SEL_TIMEOUT)
2011                         lun_id = CAM_LUN_WILDCARD;
2012                 else
2013                         lun_id = xpt_path_lun_id(ccb->ccb_h.path);
2014
2015                 /* Should we do more if we can't create the path?? */
2016                 if (xpt_create_path(&newpath, periph,
2017                                     xpt_path_path_id(ccb->ccb_h.path),
2018                                     xpt_path_target_id(ccb->ccb_h.path),
2019                                     lun_id) == CAM_REQ_CMP) {
2020                         /*
2021                          * Let peripheral drivers know that this
2022                          * device has gone away.
2023                          */
2024                         xpt_async(AC_LOST_DEVICE, newpath, NULL);
2025                         xpt_free_path(newpath);
2026                 }
2027         }
2028
2029         /* Broadcast UNIT ATTENTIONs to all periphs. */
2030         if ((action & SSQ_UA) != 0)
2031                 xpt_async(AC_UNIT_ATTENTION, orig_ccb->ccb_h.path, orig_ccb);
2032
2033         /* Rescan target on "Reported LUNs data has changed" */
2034         if ((action & SSQ_RESCAN) != 0) {
2035                 if (xpt_create_path(&newpath, NULL,
2036                                     xpt_path_path_id(ccb->ccb_h.path),
2037                                     xpt_path_target_id(ccb->ccb_h.path),
2038                                     CAM_LUN_WILDCARD) == CAM_REQ_CMP) {
2039                         scan_ccb = xpt_alloc_ccb_nowait();
2040                         if (scan_ccb != NULL) {
2041                                 scan_ccb->ccb_h.path = newpath;
2042                                 scan_ccb->ccb_h.func_code = XPT_SCAN_TGT;
2043                                 scan_ccb->crcn.flags = 0;
2044                                 xpt_rescan(scan_ccb);
2045                         } else {
2046                                 xpt_print(newpath,
2047                                     "Can't allocate CCB to rescan target\n");
2048                                 xpt_free_path(newpath);
2049                         }
2050                 }
2051         }
2052
2053         /* Attempt a retry */
2054         if (error == ERESTART || error == 0) {
2055                 if (frozen != 0)
2056                         ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
2057                 if (error == ERESTART)
2058                         xpt_action(ccb);
2059                 if (frozen != 0)
2060                         cam_release_devq(ccb->ccb_h.path,
2061                                          relsim_flags,
2062                                          openings,
2063                                          timeout,
2064                                          /*getcount_only*/0);
2065         }
2066
2067         return (error);
2068 }
2069
2070 #define CAM_PERIPH_DEVD_MSG_SIZE        256
2071
2072 static void
2073 cam_periph_devctl_notify(union ccb *ccb)
2074 {
2075         struct cam_periph *periph;
2076         struct ccb_getdev *cgd;
2077         struct sbuf sb;
2078         int serr, sk, asc, ascq;
2079         char *sbmsg, *type;
2080
2081         sbmsg = malloc(CAM_PERIPH_DEVD_MSG_SIZE, M_CAMPERIPH, M_NOWAIT);
2082         if (sbmsg == NULL)
2083                 return;
2084
2085         sbuf_new(&sb, sbmsg, CAM_PERIPH_DEVD_MSG_SIZE, SBUF_FIXEDLEN);
2086
2087         periph = xpt_path_periph(ccb->ccb_h.path);
2088         sbuf_printf(&sb, "device=%s%d ", periph->periph_name,
2089             periph->unit_number);
2090
2091         sbuf_printf(&sb, "serial=\"");
2092         if ((cgd = (struct ccb_getdev *)xpt_alloc_ccb_nowait()) != NULL) {
2093                 xpt_setup_ccb(&cgd->ccb_h, ccb->ccb_h.path,
2094                     CAM_PRIORITY_NORMAL);
2095                 cgd->ccb_h.func_code = XPT_GDEV_TYPE;
2096                 xpt_action((union ccb *)cgd);
2097
2098                 if (cgd->ccb_h.status == CAM_REQ_CMP)
2099                         sbuf_bcat(&sb, cgd->serial_num, cgd->serial_num_len);
2100                 xpt_free_ccb((union ccb *)cgd);
2101         }
2102         sbuf_printf(&sb, "\" ");
2103         sbuf_printf(&sb, "cam_status=\"0x%x\" ", ccb->ccb_h.status);
2104
2105         switch (ccb->ccb_h.status & CAM_STATUS_MASK) {
2106         case CAM_CMD_TIMEOUT:
2107                 sbuf_printf(&sb, "timeout=%d ", ccb->ccb_h.timeout);
2108                 type = "timeout";
2109                 break;
2110         case CAM_SCSI_STATUS_ERROR:
2111                 sbuf_printf(&sb, "scsi_status=%d ", ccb->csio.scsi_status);
2112                 if (scsi_extract_sense_ccb(ccb, &serr, &sk, &asc, &ascq))
2113                         sbuf_printf(&sb, "scsi_sense=\"%02x %02x %02x %02x\" ",
2114                             serr, sk, asc, ascq);
2115                 type = "error";
2116                 break;
2117         case CAM_ATA_STATUS_ERROR:
2118                 sbuf_printf(&sb, "RES=\"");
2119                 ata_res_sbuf(&ccb->ataio.res, &sb);
2120                 sbuf_printf(&sb, "\" ");
2121                 type = "error";
2122                 break;
2123         default:
2124                 type = "error";
2125                 break;
2126         }
2127
2128         if (ccb->ccb_h.func_code == XPT_SCSI_IO) {
2129                 sbuf_printf(&sb, "CDB=\"");
2130                 scsi_cdb_sbuf(scsiio_cdb_ptr(&ccb->csio), &sb);
2131                 sbuf_printf(&sb, "\" ");
2132         } else if (ccb->ccb_h.func_code == XPT_ATA_IO) {
2133                 sbuf_printf(&sb, "ACB=\"");
2134                 ata_cmd_sbuf(&ccb->ataio.cmd, &sb);
2135                 sbuf_printf(&sb, "\" ");
2136         }
2137
2138         if (sbuf_finish(&sb) == 0)
2139                 devctl_notify("CAM", "periph", type, sbuf_data(&sb));
2140         sbuf_delete(&sb);
2141         free(sbmsg, M_CAMPERIPH);
2142 }
2143
2144 /*
2145  * Sysctl to force an invalidation of the drive right now. Can be
2146  * called with CTLFLAG_MPSAFE since we take periph lock.
2147  */
2148 int
2149 cam_periph_invalidate_sysctl(SYSCTL_HANDLER_ARGS)
2150 {
2151         struct cam_periph *periph;
2152         int error, value;
2153
2154         periph = arg1;
2155         value = 0;
2156         error = sysctl_handle_int(oidp, &value, 0, req);
2157         if (error != 0 || req->newptr == NULL || value != 1)
2158                 return (error);
2159
2160         cam_periph_lock(periph);
2161         cam_periph_invalidate(periph);
2162         cam_periph_unlock(periph);
2163
2164         return (0);
2165 }