sys/cam/cam_periph.c

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