The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/cam/cam_periph.c

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    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 <vm/vm.h>
   46 #include <vm/vm_extern.h>
   47 
   48 #include <cam/cam.h>
   49 #include <cam/cam_ccb.h>
   50 #include <cam/cam_queue.h>
   51 #include <cam/cam_xpt_periph.h>
   52 #include <cam/cam_periph.h>
   53 #include <cam/cam_debug.h>
   54 #include <cam/cam_sim.h>
   55 
   56 #include <cam/scsi/scsi_all.h>
   57 #include <cam/scsi/scsi_message.h>
   58 #include <cam/scsi/scsi_pass.h>
   59 
   60 static  u_int           camperiphnextunit(struct periph_driver *p_drv,
   61                                           u_int newunit, int wired,
   62                                           path_id_t pathid, target_id_t target,
   63                                           lun_id_t lun);
   64 static  u_int           camperiphunit(struct periph_driver *p_drv,
   65                                       path_id_t pathid, target_id_t target,
   66                                       lun_id_t lun); 
   67 static  void            camperiphdone(struct cam_periph *periph, 
   68                                         union ccb *done_ccb);
   69 static  void            camperiphfree(struct cam_periph *periph);
   70 static int              camperiphscsistatuserror(union ccb *ccb,
   71                                                  cam_flags camflags,
   72                                                  u_int32_t sense_flags,
   73                                                  int *openings,
   74                                                  u_int32_t *relsim_flags,
   75                                                  u_int32_t *timeout,
   76                                                  const char **action_string);
   77 static  int             camperiphscsisenseerror(union ccb *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                                                 const char **action_string);
   84 
   85 static int nperiph_drivers;
   86 static int initialized = 0;
   87 struct periph_driver **periph_drivers;
   88 
   89 MALLOC_DEFINE(M_CAMPERIPH, "CAM periph", "CAM peripheral buffers");
   90 
   91 static int periph_selto_delay = 1000;
   92 TUNABLE_INT("kern.cam.periph_selto_delay", &periph_selto_delay);
   93 static int periph_noresrc_delay = 500;
   94 TUNABLE_INT("kern.cam.periph_noresrc_delay", &periph_noresrc_delay);
   95 static int periph_busy_delay = 500;
   96 TUNABLE_INT("kern.cam.periph_busy_delay", &periph_busy_delay);
   97 
   98 
   99 void
  100 periphdriver_register(void *data)
  101 {
  102         struct periph_driver *drv = (struct periph_driver *)data;
  103         struct periph_driver **newdrivers, **old;
  104         int ndrivers;
  105 
  106         ndrivers = nperiph_drivers + 2;
  107         newdrivers = malloc(sizeof(*newdrivers) * ndrivers, M_CAMPERIPH,
  108                             M_WAITOK);
  109         if (periph_drivers)
  110                 bcopy(periph_drivers, newdrivers,
  111                       sizeof(*newdrivers) * nperiph_drivers);
  112         newdrivers[nperiph_drivers] = drv;
  113         newdrivers[nperiph_drivers + 1] = NULL;
  114         old = periph_drivers;
  115         periph_drivers = newdrivers;
  116         if (old)
  117                 free(old, M_CAMPERIPH);
  118         nperiph_drivers++;
  119         /* If driver marked as early or it is late now, initialize it. */
  120         if (((drv->flags & CAM_PERIPH_DRV_EARLY) != 0 && initialized > 0) ||
  121             initialized > 1)
  122                 (*drv->init)();
  123 }
  124 
  125 void
  126 periphdriver_init(int level)
  127 {
  128         int     i, early;
  129 
  130         initialized = max(initialized, level);
  131         for (i = 0; periph_drivers[i] != NULL; i++) {
  132                 early = (periph_drivers[i]->flags & CAM_PERIPH_DRV_EARLY) ? 1 : 2;
  133                 if (early == initialized)
  134                         (*periph_drivers[i]->init)();
  135         }
  136 }
  137 
  138 cam_status
  139 cam_periph_alloc(periph_ctor_t *periph_ctor,
  140                  periph_oninv_t *periph_oninvalidate,
  141                  periph_dtor_t *periph_dtor, periph_start_t *periph_start,
  142                  char *name, cam_periph_type type, struct cam_path *path,
  143                  ac_callback_t *ac_callback, ac_code code, void *arg)
  144 {
  145         struct          periph_driver **p_drv;
  146         struct          cam_sim *sim;
  147         struct          cam_periph *periph;
  148         struct          cam_periph *cur_periph;
  149         path_id_t       path_id;
  150         target_id_t     target_id;
  151         lun_id_t        lun_id;
  152         cam_status      status;
  153         u_int           init_level;
  154 
  155         init_level = 0;
  156         /*
  157          * Handle Hot-Plug scenarios.  If there is already a peripheral
  158          * of our type assigned to this path, we are likely waiting for
  159          * final close on an old, invalidated, peripheral.  If this is
  160          * the case, queue up a deferred call to the peripheral's async
  161          * handler.  If it looks like a mistaken re-allocation, complain.
  162          */
  163         if ((periph = cam_periph_find(path, name)) != NULL) {
  164 
  165                 if ((periph->flags & CAM_PERIPH_INVALID) != 0
  166                  && (periph->flags & CAM_PERIPH_NEW_DEV_FOUND) == 0) {
  167                         periph->flags |= CAM_PERIPH_NEW_DEV_FOUND;
  168                         periph->deferred_callback = ac_callback;
  169                         periph->deferred_ac = code;
  170                         return (CAM_REQ_INPROG);
  171                 } else {
  172                         printf("cam_periph_alloc: attempt to re-allocate "
  173                                "valid device %s%d rejected flags %#x "
  174                                "refcount %d\n", periph->periph_name,
  175                                periph->unit_number, periph->flags,
  176                                periph->refcount);
  177                 }
  178                 return (CAM_REQ_INVALID);
  179         }
  180         
  181         periph = (struct cam_periph *)malloc(sizeof(*periph), M_CAMPERIPH,
  182                                              M_NOWAIT|M_ZERO);
  183 
  184         if (periph == NULL)
  185                 return (CAM_RESRC_UNAVAIL);
  186         
  187         init_level++;
  188 
  189 
  190         sim = xpt_path_sim(path);
  191         path_id = xpt_path_path_id(path);
  192         target_id = xpt_path_target_id(path);
  193         lun_id = xpt_path_lun_id(path);
  194         cam_init_pinfo(&periph->pinfo);
  195         periph->periph_start = periph_start;
  196         periph->periph_dtor = periph_dtor;
  197         periph->periph_oninval = periph_oninvalidate;
  198         periph->type = type;
  199         periph->periph_name = name;
  200         periph->immediate_priority = CAM_PRIORITY_NONE;
  201         periph->refcount = 0;
  202         periph->sim = sim;
  203         SLIST_INIT(&periph->ccb_list);
  204         status = xpt_create_path(&path, periph, path_id, target_id, lun_id);
  205         if (status != CAM_REQ_CMP)
  206                 goto failure;
  207         periph->path = path;
  208 
  209         xpt_lock_buses();
  210         for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
  211                 if (strcmp((*p_drv)->driver_name, name) == 0)
  212                         break;
  213         }
  214         if (*p_drv == NULL) {
  215                 printf("cam_periph_alloc: invalid periph name '%s'\n", name);
  216                 xpt_free_path(periph->path);
  217                 free(periph, M_CAMPERIPH);
  218                 xpt_unlock_buses();
  219                 return (CAM_REQ_INVALID);
  220         }
  221         periph->unit_number = camperiphunit(*p_drv, path_id, target_id, lun_id);
  222         cur_periph = TAILQ_FIRST(&(*p_drv)->units);
  223         while (cur_periph != NULL
  224             && cur_periph->unit_number < periph->unit_number)
  225                 cur_periph = TAILQ_NEXT(cur_periph, unit_links);
  226         if (cur_periph != NULL) {
  227                 KASSERT(cur_periph->unit_number != periph->unit_number, ("duplicate units on periph list"));
  228                 TAILQ_INSERT_BEFORE(cur_periph, periph, unit_links);
  229         } else {
  230                 TAILQ_INSERT_TAIL(&(*p_drv)->units, periph, unit_links);
  231                 (*p_drv)->generation++;
  232         }
  233         xpt_unlock_buses();
  234 
  235         init_level++;
  236 
  237         status = xpt_add_periph(periph);
  238         if (status != CAM_REQ_CMP)
  239                 goto failure;
  240 
  241         init_level++;
  242         CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph created\n"));
  243 
  244         status = periph_ctor(periph, arg);
  245 
  246         if (status == CAM_REQ_CMP)
  247                 init_level++;
  248 
  249 failure:
  250         switch (init_level) {
  251         case 4:
  252                 /* Initialized successfully */
  253                 break;
  254         case 3:
  255                 CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph destroyed\n"));
  256                 xpt_remove_periph(periph);
  257                 /* FALLTHROUGH */
  258         case 2:
  259                 xpt_lock_buses();
  260                 TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links);
  261                 xpt_unlock_buses();
  262                 xpt_free_path(periph->path);
  263                 /* FALLTHROUGH */
  264         case 1:
  265                 free(periph, M_CAMPERIPH);
  266                 /* FALLTHROUGH */
  267         case 0:
  268                 /* No cleanup to perform. */
  269                 break;
  270         default:
  271                 panic("%s: Unknown init level", __func__);
  272         }
  273         return(status);
  274 }
  275 
  276 /*
  277  * Find a peripheral structure with the specified path, target, lun, 
  278  * and (optionally) type.  If the name is NULL, this function will return
  279  * the first peripheral driver that matches the specified path.
  280  */
  281 struct cam_periph *
  282 cam_periph_find(struct cam_path *path, char *name)
  283 {
  284         struct periph_driver **p_drv;
  285         struct cam_periph *periph;
  286 
  287         xpt_lock_buses();
  288         for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
  289 
  290                 if (name != NULL && (strcmp((*p_drv)->driver_name, name) != 0))
  291                         continue;
  292 
  293                 TAILQ_FOREACH(periph, &(*p_drv)->units, unit_links) {
  294                         if (xpt_path_comp(periph->path, path) == 0) {
  295                                 xpt_unlock_buses();
  296                                 mtx_assert(periph->sim->mtx, MA_OWNED);
  297                                 return(periph);
  298                         }
  299                 }
  300                 if (name != NULL) {
  301                         xpt_unlock_buses();
  302                         return(NULL);
  303                 }
  304         }
  305         xpt_unlock_buses();
  306         return(NULL);
  307 }
  308 
  309 cam_status
  310 cam_periph_acquire(struct cam_periph *periph)
  311 {
  312         cam_status status;
  313 
  314         status = CAM_REQ_CMP_ERR;
  315         if (periph == NULL)
  316                 return (status);
  317 
  318         xpt_lock_buses();
  319         if ((periph->flags & CAM_PERIPH_INVALID) == 0) {
  320                 periph->refcount++;
  321                 status = CAM_REQ_CMP;
  322         }
  323         xpt_unlock_buses();
  324 
  325         return (status);
  326 }
  327 
  328 void
  329 cam_periph_release_locked_buses(struct cam_periph *periph)
  330 {
  331         if (periph->refcount != 0) {
  332                 periph->refcount--;
  333         } else {
  334                 panic("%s: release of %p when refcount is zero\n ", __func__,
  335                       periph);
  336         }
  337         if (periph->refcount == 0
  338             && (periph->flags & CAM_PERIPH_INVALID)) {
  339                 camperiphfree(periph);
  340         }
  341 }
  342 
  343 void
  344 cam_periph_release_locked(struct cam_periph *periph)
  345 {
  346 
  347         if (periph == NULL)
  348                 return;
  349 
  350         xpt_lock_buses();
  351         cam_periph_release_locked_buses(periph);
  352         xpt_unlock_buses();
  353 }
  354 
  355 void
  356 cam_periph_release(struct cam_periph *periph)
  357 {
  358         struct cam_sim *sim;
  359 
  360         if (periph == NULL)
  361                 return;
  362         
  363         sim = periph->sim;
  364         mtx_assert(sim->mtx, MA_NOTOWNED);
  365         mtx_lock(sim->mtx);
  366         cam_periph_release_locked(periph);
  367         mtx_unlock(sim->mtx);
  368 }
  369 
  370 int
  371 cam_periph_hold(struct cam_periph *periph, int priority)
  372 {
  373         int error;
  374 
  375         /*
  376          * Increment the reference count on the peripheral
  377          * while we wait for our lock attempt to succeed
  378          * to ensure the peripheral doesn't disappear out
  379          * from user us while we sleep.
  380          */
  381 
  382         if (cam_periph_acquire(periph) != CAM_REQ_CMP)
  383                 return (ENXIO);
  384 
  385         mtx_assert(periph->sim->mtx, MA_OWNED);
  386         while ((periph->flags & CAM_PERIPH_LOCKED) != 0) {
  387                 periph->flags |= CAM_PERIPH_LOCK_WANTED;
  388                 if ((error = mtx_sleep(periph, periph->sim->mtx, priority,
  389                     "caplck", 0)) != 0) {
  390                         cam_periph_release_locked(periph);
  391                         return (error);
  392                 }
  393                 if (periph->flags & CAM_PERIPH_INVALID) {
  394                         cam_periph_release_locked(periph);
  395                         return (ENXIO);
  396                 }
  397         }
  398 
  399         periph->flags |= CAM_PERIPH_LOCKED;
  400         return (0);
  401 }
  402 
  403 void
  404 cam_periph_unhold(struct cam_periph *periph)
  405 {
  406 
  407         mtx_assert(periph->sim->mtx, MA_OWNED);
  408 
  409         periph->flags &= ~CAM_PERIPH_LOCKED;
  410         if ((periph->flags & CAM_PERIPH_LOCK_WANTED) != 0) {
  411                 periph->flags &= ~CAM_PERIPH_LOCK_WANTED;
  412                 wakeup(periph);
  413         }
  414 
  415         cam_periph_release_locked(periph);
  416 }
  417 
  418 /*
  419  * Look for the next unit number that is not currently in use for this
  420  * peripheral type starting at "newunit".  Also exclude unit numbers that
  421  * are reserved by for future "hardwiring" unless we already know that this
  422  * is a potential wired device.  Only assume that the device is "wired" the
  423  * first time through the loop since after that we'll be looking at unit
  424  * numbers that did not match a wiring entry.
  425  */
  426 static u_int
  427 camperiphnextunit(struct periph_driver *p_drv, u_int newunit, int wired,
  428                   path_id_t pathid, target_id_t target, lun_id_t lun)
  429 {
  430         struct  cam_periph *periph;
  431         char    *periph_name;
  432         int     i, val, dunit, r;
  433         const char *dname, *strval;
  434 
  435         periph_name = p_drv->driver_name;
  436         for (;;newunit++) {
  437 
  438                 for (periph = TAILQ_FIRST(&p_drv->units);
  439                      periph != NULL && periph->unit_number != newunit;
  440                      periph = TAILQ_NEXT(periph, unit_links))
  441                         ;
  442 
  443                 if (periph != NULL && periph->unit_number == newunit) {
  444                         if (wired != 0) {
  445                                 xpt_print(periph->path, "Duplicate Wired "
  446                                     "Device entry!\n");
  447                                 xpt_print(periph->path, "Second device (%s "
  448                                     "device at scbus%d target %d lun %d) will "
  449                                     "not be wired\n", periph_name, pathid,
  450                                     target, lun);
  451                                 wired = 0;
  452                         }
  453                         continue;
  454                 }
  455                 if (wired)
  456                         break;
  457 
  458                 /*
  459                  * Don't match entries like "da 4" as a wired down
  460                  * device, but do match entries like "da 4 target 5"
  461                  * or even "da 4 scbus 1". 
  462                  */
  463                 i = 0;
  464                 dname = periph_name;
  465                 for (;;) {
  466                         r = resource_find_dev(&i, dname, &dunit, NULL, NULL);
  467                         if (r != 0)
  468                                 break;
  469                         /* if no "target" and no specific scbus, skip */
  470                         if (resource_int_value(dname, dunit, "target", &val) &&
  471                             (resource_string_value(dname, dunit, "at",&strval)||
  472                              strcmp(strval, "scbus") == 0))
  473                                 continue;
  474                         if (newunit == dunit)
  475                                 break;
  476                 }
  477                 if (r != 0)
  478                         break;
  479         }
  480         return (newunit);
  481 }
  482 
  483 static u_int
  484 camperiphunit(struct periph_driver *p_drv, path_id_t pathid,
  485               target_id_t target, lun_id_t lun)
  486 {
  487         u_int   unit;
  488         int     wired, i, val, dunit;
  489         const char *dname, *strval;
  490         char    pathbuf[32], *periph_name;
  491 
  492         periph_name = p_drv->driver_name;
  493         snprintf(pathbuf, sizeof(pathbuf), "scbus%d", pathid);
  494         unit = 0;
  495         i = 0;
  496         dname = periph_name;
  497         for (wired = 0; resource_find_dev(&i, dname, &dunit, NULL, NULL) == 0;
  498              wired = 0) {
  499                 if (resource_string_value(dname, dunit, "at", &strval) == 0) {
  500                         if (strcmp(strval, pathbuf) != 0)
  501                                 continue;
  502                         wired++;
  503                 }
  504                 if (resource_int_value(dname, dunit, "target", &val) == 0) {
  505                         if (val != target)
  506                                 continue;
  507                         wired++;
  508                 }
  509                 if (resource_int_value(dname, dunit, "lun", &val) == 0) {
  510                         if (val != lun)
  511                                 continue;
  512                         wired++;
  513                 }
  514                 if (wired != 0) {
  515                         unit = dunit;
  516                         break;
  517                 }
  518         }
  519 
  520         /*
  521          * Either start from 0 looking for the next unit or from
  522          * the unit number given in the resource config.  This way,
  523          * if we have wildcard matches, we don't return the same
  524          * unit number twice.
  525          */
  526         unit = camperiphnextunit(p_drv, unit, wired, pathid, target, lun);
  527 
  528         return (unit);
  529 }
  530 
  531 void
  532 cam_periph_invalidate(struct cam_periph *periph)
  533 {
  534 
  535         CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph invalidated\n"));
  536         /*
  537          * We only call this routine the first time a peripheral is
  538          * invalidated.
  539          */
  540         if (((periph->flags & CAM_PERIPH_INVALID) == 0)
  541          && (periph->periph_oninval != NULL))
  542                 periph->periph_oninval(periph);
  543 
  544         periph->flags |= CAM_PERIPH_INVALID;
  545         periph->flags &= ~CAM_PERIPH_NEW_DEV_FOUND;
  546 
  547         xpt_lock_buses();
  548         if (periph->refcount == 0)
  549                 camperiphfree(periph);
  550         xpt_unlock_buses();
  551 }
  552 
  553 static void
  554 camperiphfree(struct cam_periph *periph)
  555 {
  556         struct periph_driver **p_drv;
  557 
  558         for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
  559                 if (strcmp((*p_drv)->driver_name, periph->periph_name) == 0)
  560                         break;
  561         }
  562         if (*p_drv == NULL) {
  563                 printf("camperiphfree: attempt to free non-existant periph\n");
  564                 return;
  565         }
  566 
  567         TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links);
  568         (*p_drv)->generation++;
  569         xpt_unlock_buses();
  570 
  571         if (periph->periph_dtor != NULL)
  572                 periph->periph_dtor(periph);
  573         xpt_remove_periph(periph);
  574         CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph destroyed\n"));
  575 
  576         if (periph->flags & CAM_PERIPH_NEW_DEV_FOUND) {
  577                 union ccb ccb;
  578                 void *arg;
  579 
  580                 switch (periph->deferred_ac) {
  581                 case AC_FOUND_DEVICE:
  582                         ccb.ccb_h.func_code = XPT_GDEV_TYPE;
  583                         xpt_setup_ccb(&ccb.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
  584                         xpt_action(&ccb);
  585                         arg = &ccb;
  586                         break;
  587                 case AC_PATH_REGISTERED:
  588                         ccb.ccb_h.func_code = XPT_PATH_INQ;
  589                         xpt_setup_ccb(&ccb.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
  590                         xpt_action(&ccb);
  591                         arg = &ccb;
  592                         break;
  593                 default:
  594                         arg = NULL;
  595                         break;
  596                 }
  597                 periph->deferred_callback(NULL, periph->deferred_ac,
  598                                           periph->path, arg);
  599         }
  600         xpt_free_path(periph->path);
  601         free(periph, M_CAMPERIPH);
  602         xpt_lock_buses();
  603 }
  604 
  605 /*
  606  * Map user virtual pointers into kernel virtual address space, so we can
  607  * access the memory.  This won't work on physical pointers, for now it's
  608  * up to the caller to check for that.  (XXX KDM -- should we do that here
  609  * instead?)  This also only works for up to MAXPHYS memory.  Since we use
  610  * buffers to map stuff in and out, we're limited to the buffer size.
  611  */
  612 int
  613 cam_periph_mapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo)
  614 {
  615         int numbufs, i, j;
  616         int flags[CAM_PERIPH_MAXMAPS];
  617         u_int8_t **data_ptrs[CAM_PERIPH_MAXMAPS];
  618         u_int32_t lengths[CAM_PERIPH_MAXMAPS];
  619         u_int32_t dirs[CAM_PERIPH_MAXMAPS];
  620         /* Some controllers may not be able to handle more data. */
  621         size_t maxmap = DFLTPHYS;
  622 
  623         switch(ccb->ccb_h.func_code) {
  624         case XPT_DEV_MATCH:
  625                 if (ccb->cdm.match_buf_len == 0) {
  626                         printf("cam_periph_mapmem: invalid match buffer "
  627                                "length 0\n");
  628                         return(EINVAL);
  629                 }
  630                 if (ccb->cdm.pattern_buf_len > 0) {
  631                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.patterns;
  632                         lengths[0] = ccb->cdm.pattern_buf_len;
  633                         dirs[0] = CAM_DIR_OUT;
  634                         data_ptrs[1] = (u_int8_t **)&ccb->cdm.matches;
  635                         lengths[1] = ccb->cdm.match_buf_len;
  636                         dirs[1] = CAM_DIR_IN;
  637                         numbufs = 2;
  638                 } else {
  639                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.matches;
  640                         lengths[0] = ccb->cdm.match_buf_len;
  641                         dirs[0] = CAM_DIR_IN;
  642                         numbufs = 1;
  643                 }
  644                 /*
  645                  * This request will not go to the hardware, no reason
  646                  * to be so strict. vmapbuf() is able to map up to MAXPHYS.
  647                  */
  648                 maxmap = MAXPHYS;
  649                 break;
  650         case XPT_SCSI_IO:
  651         case XPT_CONT_TARGET_IO:
  652                 if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_NONE)
  653                         return(0);
  654 
  655                 data_ptrs[0] = &ccb->csio.data_ptr;
  656                 lengths[0] = ccb->csio.dxfer_len;
  657                 dirs[0] = ccb->ccb_h.flags & CAM_DIR_MASK;
  658                 numbufs = 1;
  659                 break;
  660         case XPT_ATA_IO:
  661                 if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_NONE)
  662                         return(0);
  663 
  664                 data_ptrs[0] = &ccb->ataio.data_ptr;
  665                 lengths[0] = ccb->ataio.dxfer_len;
  666                 dirs[0] = ccb->ccb_h.flags & CAM_DIR_MASK;
  667                 numbufs = 1;
  668                 break;
  669         default:
  670                 return(EINVAL);
  671                 break; /* NOTREACHED */
  672         }
  673 
  674         /*
  675          * Check the transfer length and permissions first, so we don't
  676          * have to unmap any previously mapped buffers.
  677          */
  678         for (i = 0; i < numbufs; i++) {
  679 
  680                 flags[i] = 0;
  681 
  682                 /*
  683                  * The userland data pointer passed in may not be page
  684                  * aligned.  vmapbuf() truncates the address to a page
  685                  * boundary, so if the address isn't page aligned, we'll
  686                  * need enough space for the given transfer length, plus
  687                  * whatever extra space is necessary to make it to the page
  688                  * boundary.
  689                  */
  690                 if ((lengths[i] +
  691                     (((vm_offset_t)(*data_ptrs[i])) & PAGE_MASK)) > maxmap){
  692                         printf("cam_periph_mapmem: attempt to map %lu bytes, "
  693                                "which is greater than %lu\n",
  694                                (long)(lengths[i] +
  695                                (((vm_offset_t)(*data_ptrs[i])) & PAGE_MASK)),
  696                                (u_long)maxmap);
  697                         return(E2BIG);
  698                 }
  699 
  700                 if (dirs[i] & CAM_DIR_OUT) {
  701                         flags[i] = BIO_WRITE;
  702                 }
  703 
  704                 if (dirs[i] & CAM_DIR_IN) {
  705                         flags[i] = BIO_READ;
  706                 }
  707 
  708         }
  709 
  710         /* this keeps the current process from getting swapped */
  711         /*
  712          * XXX KDM should I use P_NOSWAP instead?
  713          */
  714         PHOLD(curproc);
  715 
  716         for (i = 0; i < numbufs; i++) {
  717                 /*
  718                  * Get the buffer.
  719                  */
  720                 mapinfo->bp[i] = getpbuf(NULL);
  721 
  722                 /* save the buffer's data address */
  723                 mapinfo->bp[i]->b_saveaddr = mapinfo->bp[i]->b_data;
  724 
  725                 /* put our pointer in the data slot */
  726                 mapinfo->bp[i]->b_data = *data_ptrs[i];
  727 
  728                 /* set the transfer length, we know it's < MAXPHYS */
  729                 mapinfo->bp[i]->b_bufsize = lengths[i];
  730 
  731                 /* set the direction */
  732                 mapinfo->bp[i]->b_iocmd = flags[i];
  733 
  734                 /*
  735                  * Map the buffer into kernel memory.
  736                  *
  737                  * Note that useracc() alone is not a  sufficient test.
  738                  * vmapbuf() can still fail due to a smaller file mapped
  739                  * into a larger area of VM, or if userland races against
  740                  * vmapbuf() after the useracc() check.
  741                  */
  742                 if (vmapbuf(mapinfo->bp[i]) < 0) {
  743                         for (j = 0; j < i; ++j) {
  744                                 *data_ptrs[j] = mapinfo->bp[j]->b_saveaddr;
  745                                 vunmapbuf(mapinfo->bp[j]);
  746                                 relpbuf(mapinfo->bp[j], NULL);
  747                         }
  748                         relpbuf(mapinfo->bp[i], NULL);
  749                         PRELE(curproc);
  750                         return(EACCES);
  751                 }
  752 
  753                 /* set our pointer to the new mapped area */
  754                 *data_ptrs[i] = mapinfo->bp[i]->b_data;
  755 
  756                 mapinfo->num_bufs_used++;
  757         }
  758 
  759         /*
  760          * Now that we've gotten this far, change ownership to the kernel
  761          * of the buffers so that we don't run afoul of returning to user
  762          * space with locks (on the buffer) held.
  763          */
  764         for (i = 0; i < numbufs; i++) {
  765                 BUF_KERNPROC(mapinfo->bp[i]);
  766         }
  767 
  768 
  769         return(0);
  770 }
  771 
  772 /*
  773  * Unmap memory segments mapped into kernel virtual address space by
  774  * cam_periph_mapmem().
  775  */
  776 void
  777 cam_periph_unmapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo)
  778 {
  779         int numbufs, i;
  780         u_int8_t **data_ptrs[CAM_PERIPH_MAXMAPS];
  781 
  782         if (mapinfo->num_bufs_used <= 0) {
  783                 /* allow ourselves to be swapped once again */
  784                 PRELE(curproc);
  785                 return;
  786         }
  787 
  788         switch (ccb->ccb_h.func_code) {
  789         case XPT_DEV_MATCH:
  790                 numbufs = min(mapinfo->num_bufs_used, 2);
  791 
  792                 if (numbufs == 1) {
  793                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.matches;
  794                 } else {
  795                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.patterns;
  796                         data_ptrs[1] = (u_int8_t **)&ccb->cdm.matches;
  797                 }
  798                 break;
  799         case XPT_SCSI_IO:
  800         case XPT_CONT_TARGET_IO:
  801                 data_ptrs[0] = &ccb->csio.data_ptr;
  802                 numbufs = min(mapinfo->num_bufs_used, 1);
  803                 break;
  804         case XPT_ATA_IO:
  805                 data_ptrs[0] = &ccb->ataio.data_ptr;
  806                 numbufs = min(mapinfo->num_bufs_used, 1);
  807                 break;
  808         default:
  809                 /* allow ourselves to be swapped once again */
  810                 PRELE(curproc);
  811                 return;
  812                 break; /* NOTREACHED */ 
  813         }
  814 
  815         for (i = 0; i < numbufs; i++) {
  816                 /* Set the user's pointer back to the original value */
  817                 *data_ptrs[i] = mapinfo->bp[i]->b_saveaddr;
  818 
  819                 /* unmap the buffer */
  820                 vunmapbuf(mapinfo->bp[i]);
  821 
  822                 /* release the buffer */
  823                 relpbuf(mapinfo->bp[i], NULL);
  824         }
  825 
  826         /* allow ourselves to be swapped once again */
  827         PRELE(curproc);
  828 }
  829 
  830 union ccb *
  831 cam_periph_getccb(struct cam_periph *periph, u_int32_t priority)
  832 {
  833         struct ccb_hdr *ccb_h;
  834 
  835         mtx_assert(periph->sim->mtx, MA_OWNED);
  836         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("entering cdgetccb\n"));
  837 
  838         while (SLIST_FIRST(&periph->ccb_list) == NULL) {
  839                 if (periph->immediate_priority > priority)
  840                         periph->immediate_priority = priority;
  841                 xpt_schedule(periph, priority);
  842                 if ((SLIST_FIRST(&periph->ccb_list) != NULL)
  843                  && (SLIST_FIRST(&periph->ccb_list)->pinfo.priority == priority))
  844                         break;
  845                 mtx_assert(periph->sim->mtx, MA_OWNED);
  846                 mtx_sleep(&periph->ccb_list, periph->sim->mtx, PRIBIO, "cgticb",
  847                     0);
  848         }
  849 
  850         ccb_h = SLIST_FIRST(&periph->ccb_list);
  851         SLIST_REMOVE_HEAD(&periph->ccb_list, periph_links.sle);
  852         return ((union ccb *)ccb_h);
  853 }
  854 
  855 void
  856 cam_periph_ccbwait(union ccb *ccb)
  857 {
  858         struct cam_sim *sim;
  859 
  860         sim = xpt_path_sim(ccb->ccb_h.path);
  861         if ((ccb->ccb_h.pinfo.index != CAM_UNQUEUED_INDEX)
  862          || ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_INPROG))
  863                 mtx_sleep(&ccb->ccb_h.cbfcnp, sim->mtx, PRIBIO, "cbwait", 0);
  864 }
  865 
  866 int
  867 cam_periph_ioctl(struct cam_periph *periph, u_long cmd, caddr_t addr,
  868                  int (*error_routine)(union ccb *ccb, 
  869                                       cam_flags camflags,
  870                                       u_int32_t sense_flags))
  871 {
  872         union ccb            *ccb;
  873         int                  error;
  874         int                  found;
  875 
  876         error = found = 0;
  877 
  878         switch(cmd){
  879         case CAMGETPASSTHRU:
  880                 ccb = cam_periph_getccb(periph, CAM_PRIORITY_NORMAL);
  881                 xpt_setup_ccb(&ccb->ccb_h,
  882                               ccb->ccb_h.path,
  883                               CAM_PRIORITY_NORMAL);
  884                 ccb->ccb_h.func_code = XPT_GDEVLIST;
  885 
  886                 /*
  887                  * Basically, the point of this is that we go through
  888                  * getting the list of devices, until we find a passthrough
  889                  * device.  In the current version of the CAM code, the
  890                  * only way to determine what type of device we're dealing
  891                  * with is by its name.
  892                  */
  893                 while (found == 0) {
  894                         ccb->cgdl.index = 0;
  895                         ccb->cgdl.status = CAM_GDEVLIST_MORE_DEVS;
  896                         while (ccb->cgdl.status == CAM_GDEVLIST_MORE_DEVS) {
  897 
  898                                 /* we want the next device in the list */
  899                                 xpt_action(ccb);
  900                                 if (strncmp(ccb->cgdl.periph_name, 
  901                                     "pass", 4) == 0){
  902                                         found = 1;
  903                                         break;
  904                                 }
  905                         }
  906                         if ((ccb->cgdl.status == CAM_GDEVLIST_LAST_DEVICE) &&
  907                             (found == 0)) {
  908                                 ccb->cgdl.periph_name[0] = '\0';
  909                                 ccb->cgdl.unit_number = 0;
  910                                 break;
  911                         }
  912                 }
  913 
  914                 /* copy the result back out */  
  915                 bcopy(ccb, addr, sizeof(union ccb));
  916 
  917                 /* and release the ccb */
  918                 xpt_release_ccb(ccb);
  919 
  920                 break;
  921         default:
  922                 error = ENOTTY;
  923                 break;
  924         }
  925         return(error);
  926 }
  927 
  928 int
  929 cam_periph_runccb(union ccb *ccb,
  930                   int (*error_routine)(union ccb *ccb,
  931                                        cam_flags camflags,
  932                                        u_int32_t sense_flags),
  933                   cam_flags camflags, u_int32_t sense_flags,
  934                   struct devstat *ds)
  935 {
  936         struct cam_sim *sim;
  937         int error;
  938  
  939         error = 0;
  940         sim = xpt_path_sim(ccb->ccb_h.path);
  941         mtx_assert(sim->mtx, MA_OWNED);
  942 
  943         /*
  944          * If the user has supplied a stats structure, and if we understand
  945          * this particular type of ccb, record the transaction start.
  946          */
  947         if ((ds != NULL) && (ccb->ccb_h.func_code == XPT_SCSI_IO ||
  948             ccb->ccb_h.func_code == XPT_ATA_IO))
  949                 devstat_start_transaction(ds, NULL);
  950 
  951         xpt_action(ccb);
  952  
  953         do {
  954                 cam_periph_ccbwait(ccb);
  955                 if ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP)
  956                         error = 0;
  957                 else if (error_routine != NULL)
  958                         error = (*error_routine)(ccb, camflags, sense_flags);
  959                 else
  960                         error = 0;
  961 
  962         } while (error == ERESTART);
  963           
  964         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) {
  965                 cam_release_devq(ccb->ccb_h.path,
  966                                  /* relsim_flags */0,
  967                                  /* openings */0,
  968                                  /* timeout */0,
  969                                  /* getcount_only */ FALSE);
  970                 ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
  971         }
  972 
  973         if (ds != NULL) {
  974                 if (ccb->ccb_h.func_code == XPT_SCSI_IO) {
  975                         devstat_end_transaction(ds,
  976                                         ccb->csio.dxfer_len,
  977                                         ccb->csio.tag_action & 0x3,
  978                                         ((ccb->ccb_h.flags & CAM_DIR_MASK) ==
  979                                         CAM_DIR_NONE) ?  DEVSTAT_NO_DATA : 
  980                                         (ccb->ccb_h.flags & CAM_DIR_OUT) ?
  981                                         DEVSTAT_WRITE : 
  982                                         DEVSTAT_READ, NULL, NULL);
  983                 } else if (ccb->ccb_h.func_code == XPT_ATA_IO) {
  984                         devstat_end_transaction(ds,
  985                                         ccb->ataio.dxfer_len,
  986                                         ccb->ataio.tag_action & 0x3,
  987                                         ((ccb->ccb_h.flags & CAM_DIR_MASK) ==
  988                                         CAM_DIR_NONE) ?  DEVSTAT_NO_DATA : 
  989                                         (ccb->ccb_h.flags & CAM_DIR_OUT) ?
  990                                         DEVSTAT_WRITE : 
  991                                         DEVSTAT_READ, NULL, NULL);
  992                 }
  993         }
  994 
  995         return(error);
  996 }
  997 
  998 void
  999 cam_freeze_devq(struct cam_path *path)
 1000 {
 1001 
 1002         cam_freeze_devq_arg(path, 0, 0);
 1003 }
 1004 
 1005 void
 1006 cam_freeze_devq_arg(struct cam_path *path, uint32_t flags, uint32_t arg)
 1007 {
 1008         struct ccb_relsim crs;
 1009 
 1010         xpt_setup_ccb(&crs.ccb_h, path, CAM_PRIORITY_NONE);
 1011         crs.ccb_h.func_code = XPT_FREEZE_QUEUE;
 1012         crs.release_flags = flags;
 1013         crs.openings = arg;
 1014         crs.release_timeout = arg;
 1015         xpt_action((union ccb *)&crs);
 1016 }
 1017 
 1018 u_int32_t
 1019 cam_release_devq(struct cam_path *path, u_int32_t relsim_flags,
 1020                  u_int32_t openings, u_int32_t arg,
 1021                  int getcount_only)
 1022 {
 1023         struct ccb_relsim crs;
 1024 
 1025         xpt_setup_ccb(&crs.ccb_h, path, CAM_PRIORITY_NORMAL);
 1026         crs.ccb_h.func_code = XPT_REL_SIMQ;
 1027         crs.ccb_h.flags = getcount_only ? CAM_DEV_QFREEZE : 0;
 1028         crs.release_flags = relsim_flags;
 1029         crs.openings = openings;
 1030         crs.release_timeout = arg;
 1031         xpt_action((union ccb *)&crs);
 1032         return (crs.qfrozen_cnt);
 1033 }
 1034 
 1035 #define saved_ccb_ptr ppriv_ptr0
 1036 #define recovery_depth ppriv_field1
 1037 static void
 1038 camperiphsensedone(struct cam_periph *periph, union ccb *done_ccb)
 1039 {
 1040         union ccb      *saved_ccb = (union ccb *)done_ccb->ccb_h.saved_ccb_ptr;
 1041         cam_status      status;
 1042         int             frozen = 0;
 1043         u_int           sense_key;
 1044         int             depth = done_ccb->ccb_h.recovery_depth;
 1045 
 1046         status = done_ccb->ccb_h.status;
 1047         if (status & CAM_DEV_QFRZN) {
 1048                 frozen = 1;
 1049                 /*
 1050                  * Clear freeze flag now for case of retry,
 1051                  * freeze will be dropped later.
 1052                  */
 1053                 done_ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
 1054         }
 1055         status &= CAM_STATUS_MASK;
 1056         switch (status) {
 1057         case CAM_REQ_CMP:
 1058         {
 1059                 /*
 1060                  * If we manually retrieved sense into a CCB and got
 1061                  * something other than "NO SENSE" send the updated CCB
 1062                  * back to the client via xpt_done() to be processed via
 1063                  * the error recovery code again.
 1064                  */
 1065                 sense_key = saved_ccb->csio.sense_data.flags;
 1066                 sense_key &= SSD_KEY;
 1067                 if (sense_key != SSD_KEY_NO_SENSE) {
 1068                         saved_ccb->ccb_h.status |=
 1069                             CAM_AUTOSNS_VALID;
 1070                 } else {
 1071                         saved_ccb->ccb_h.status &=
 1072                             ~CAM_STATUS_MASK;
 1073                         saved_ccb->ccb_h.status |=
 1074                             CAM_AUTOSENSE_FAIL;
 1075                 }
 1076                 saved_ccb->csio.sense_resid = done_ccb->csio.resid;
 1077                 bcopy(saved_ccb, done_ccb, sizeof(union ccb));
 1078                 xpt_free_ccb(saved_ccb);
 1079                 break;
 1080         }
 1081         default:
 1082                 bcopy(saved_ccb, done_ccb, sizeof(union ccb));
 1083                 xpt_free_ccb(saved_ccb);
 1084                 done_ccb->ccb_h.status &= ~CAM_STATUS_MASK;
 1085                 done_ccb->ccb_h.status |= CAM_AUTOSENSE_FAIL;
 1086                 break;
 1087         }
 1088         periph->flags &= ~CAM_PERIPH_SENSE_INPROG;
 1089         /*
 1090          * If it is the end of recovery, drop freeze, taken due to
 1091          * CAM_DEV_QFREEZE flag, set on recovery request.
 1092          */
 1093         if (depth == 0) {
 1094                 cam_release_devq(done_ccb->ccb_h.path,
 1095                          /*relsim_flags*/0,
 1096                          /*openings*/0,
 1097                          /*timeout*/0,
 1098                          /*getcount_only*/0);
 1099         }
 1100         /*
 1101          * Copy frozen flag from recovery request if it is set there
 1102          * for some reason.
 1103          */
 1104         if (frozen != 0)
 1105                 done_ccb->ccb_h.status |= CAM_DEV_QFRZN;
 1106         (*done_ccb->ccb_h.cbfcnp)(periph, done_ccb);
 1107 }
 1108 
 1109 static void
 1110 camperiphdone(struct cam_periph *periph, union ccb *done_ccb)
 1111 {
 1112         union ccb      *saved_ccb, *save_ccb;
 1113         cam_status      status;
 1114         int             frozen = 0;
 1115         struct scsi_start_stop_unit *scsi_cmd;
 1116         u_int32_t       relsim_flags, timeout;
 1117 
 1118         status = done_ccb->ccb_h.status;
 1119         if (status & CAM_DEV_QFRZN) {
 1120                 frozen = 1;
 1121                 /*
 1122                  * Clear freeze flag now for case of retry,
 1123                  * freeze will be dropped later.
 1124                  */
 1125                 done_ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
 1126         }
 1127 
 1128         timeout = 0;
 1129         relsim_flags = 0;
 1130         saved_ccb = (union ccb *)done_ccb->ccb_h.saved_ccb_ptr;
 1131 
 1132         switch (status & CAM_STATUS_MASK) {
 1133         case CAM_REQ_CMP:
 1134         {
 1135                 /*
 1136                  * If we have successfully taken a device from the not
 1137                  * ready to ready state, re-scan the device and re-get
 1138                  * the inquiry information.  Many devices (mostly disks)
 1139                  * don't properly report their inquiry information unless
 1140                  * they are spun up.
 1141                  */
 1142                 scsi_cmd = (struct scsi_start_stop_unit *)
 1143                                 &done_ccb->csio.cdb_io.cdb_bytes;
 1144 
 1145                 if (scsi_cmd->opcode == START_STOP_UNIT)
 1146                         xpt_async(AC_INQ_CHANGED,
 1147                                   done_ccb->ccb_h.path, NULL);
 1148                 goto final;
 1149         }
 1150         case CAM_SCSI_STATUS_ERROR:
 1151                 scsi_cmd = (struct scsi_start_stop_unit *)
 1152                                 &done_ccb->csio.cdb_io.cdb_bytes;
 1153                 if (status & CAM_AUTOSNS_VALID) {
 1154                         struct ccb_getdev cgd;
 1155                         struct scsi_sense_data *sense;
 1156                         int    error_code, sense_key, asc, ascq;        
 1157                         scsi_sense_action err_action;
 1158 
 1159                         sense = &done_ccb->csio.sense_data;
 1160                         scsi_extract_sense(sense, &error_code, 
 1161                                            &sense_key, &asc, &ascq);
 1162                         /*
 1163                          * Grab the inquiry data for this device.
 1164                          */
 1165                         xpt_setup_ccb(&cgd.ccb_h, done_ccb->ccb_h.path,
 1166                             CAM_PRIORITY_NORMAL);
 1167                         cgd.ccb_h.func_code = XPT_GDEV_TYPE;
 1168                         xpt_action((union ccb *)&cgd);
 1169                         err_action = scsi_error_action(&done_ccb->csio,
 1170                                                        &cgd.inq_data, 0);
 1171                         /*
 1172                          * If the error is "invalid field in CDB", 
 1173                          * and the load/eject flag is set, turn the 
 1174                          * flag off and try again.  This is just in 
 1175                          * case the drive in question barfs on the 
 1176                          * load eject flag.  The CAM code should set 
 1177                          * the load/eject flag by default for 
 1178                          * removable media.
 1179                          */
 1180                         /* XXX KDM 
 1181                          * Should we check to see what the specific
 1182                          * scsi status is??  Or does it not matter
 1183                          * since we already know that there was an
 1184                          * error, and we know what the specific
 1185                          * error code was, and we know what the
 1186                          * opcode is..
 1187                          */
 1188                         if ((scsi_cmd->opcode == START_STOP_UNIT) &&
 1189                             ((scsi_cmd->how & SSS_LOEJ) != 0) &&
 1190                              (asc == 0x24) && (ascq == 0x00) &&
 1191                              (done_ccb->ccb_h.retry_count > 0)) {
 1192 
 1193                                 scsi_cmd->how &= ~SSS_LOEJ;
 1194                                 xpt_action(done_ccb);
 1195                         } else if ((done_ccb->ccb_h.retry_count > 1)
 1196                                 && ((err_action & SS_MASK) != SS_FAIL)) {
 1197 
 1198                                 /*
 1199                                  * In this case, the error recovery
 1200                                  * command failed, but we've got 
 1201                                  * some retries left on it.  Give
 1202                                  * it another try unless this is an
 1203                                  * unretryable error.
 1204                                  */
 1205                                 /* set the timeout to .5 sec */
 1206                                 relsim_flags =
 1207                                         RELSIM_RELEASE_AFTER_TIMEOUT;
 1208                                 timeout = 500;
 1209                                 xpt_action(done_ccb);
 1210                                 break;
 1211                         } else {
 1212                                 /* 
 1213                                  * Perform the final retry with the original
 1214                                  * CCB so that final error processing is
 1215                                  * performed by the owner of the CCB.
 1216                                  */
 1217                                 goto final;
 1218                         }
 1219                 } else {
 1220                         save_ccb = xpt_alloc_ccb_nowait();
 1221                         if (save_ccb == NULL)
 1222                                 goto final;
 1223                         bcopy(done_ccb, save_ccb, sizeof(*save_ccb));
 1224                         periph->flags |= CAM_PERIPH_SENSE_INPROG;
 1225                         /*
 1226                          * Send a Request Sense to the device.  We
 1227                          * assume that we are in a contingent allegiance
 1228                          * condition so we do not tag this request.
 1229                          */
 1230                         scsi_request_sense(&done_ccb->csio, /*retries*/1,
 1231                                            camperiphsensedone,
 1232                                            &save_ccb->csio.sense_data,
 1233                                            save_ccb->csio.sense_len,
 1234                                            CAM_TAG_ACTION_NONE,
 1235                                            /*sense_len*/SSD_FULL_SIZE,
 1236                                            /*timeout*/5000);
 1237                         done_ccb->ccb_h.pinfo.priority--;
 1238                         done_ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
 1239                         done_ccb->ccb_h.saved_ccb_ptr = save_ccb;
 1240                         done_ccb->ccb_h.recovery_depth++;
 1241                         xpt_action(done_ccb);
 1242                 }
 1243                 break;
 1244         default:
 1245 final:
 1246                 bcopy(saved_ccb, done_ccb, sizeof(*done_ccb));
 1247                 xpt_free_ccb(saved_ccb);
 1248                 periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG;
 1249                 xpt_action(done_ccb);
 1250                 break;
 1251         }
 1252 
 1253         /* decrement the retry count */
 1254         /*
 1255          * XXX This isn't appropriate in all cases.  Restructure,
 1256          *     so that the retry count is only decremented on an
 1257          *     actual retry.  Remeber that the orignal ccb had its
 1258          *     retry count dropped before entering recovery, so
 1259          *     doing it again is a bug.
 1260          */
 1261         if (done_ccb->ccb_h.retry_count > 0)
 1262                 done_ccb->ccb_h.retry_count--;
 1263         /*
 1264          * Drop freeze taken due to CAM_DEV_QFREEZE flag set on recovery
 1265          * request.
 1266          */
 1267         cam_release_devq(done_ccb->ccb_h.path,
 1268                          /*relsim_flags*/relsim_flags,
 1269                          /*openings*/0,
 1270                          /*timeout*/timeout,
 1271                          /*getcount_only*/0);
 1272         /* Drop freeze taken, if this recovery request got error. */
 1273         if (frozen != 0) {
 1274                 cam_release_devq(done_ccb->ccb_h.path,
 1275                          /*relsim_flags*/0,
 1276                          /*openings*/0,
 1277                          /*timeout*/0,
 1278                          /*getcount_only*/0);
 1279         }
 1280 }
 1281 
 1282 /*
 1283  * Generic Async Event handler.  Peripheral drivers usually
 1284  * filter out the events that require personal attention,
 1285  * and leave the rest to this function.
 1286  */
 1287 void
 1288 cam_periph_async(struct cam_periph *periph, u_int32_t code,
 1289                  struct cam_path *path, void *arg)
 1290 {
 1291         switch (code) {
 1292         case AC_LOST_DEVICE:
 1293                 cam_periph_invalidate(periph);
 1294                 break; 
 1295         default:
 1296                 break;
 1297         }
 1298 }
 1299 
 1300 void
 1301 cam_periph_bus_settle(struct cam_periph *periph, u_int bus_settle)
 1302 {
 1303         struct ccb_getdevstats cgds;
 1304 
 1305         xpt_setup_ccb(&cgds.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 1306         cgds.ccb_h.func_code = XPT_GDEV_STATS;
 1307         xpt_action((union ccb *)&cgds);
 1308         cam_periph_freeze_after_event(periph, &cgds.last_reset, bus_settle);
 1309 }
 1310 
 1311 void
 1312 cam_periph_freeze_after_event(struct cam_periph *periph,
 1313                               struct timeval* event_time, u_int duration_ms)
 1314 {
 1315         struct timeval delta;
 1316         struct timeval duration_tv;
 1317 
 1318         microtime(&delta);
 1319         timevalsub(&delta, event_time);
 1320         duration_tv.tv_sec = duration_ms / 1000;
 1321         duration_tv.tv_usec = (duration_ms % 1000) * 1000;
 1322         if (timevalcmp(&delta, &duration_tv, <)) {
 1323                 timevalsub(&duration_tv, &delta);
 1324 
 1325                 duration_ms = duration_tv.tv_sec * 1000;
 1326                 duration_ms += duration_tv.tv_usec / 1000;
 1327                 cam_freeze_devq(periph->path); 
 1328                 cam_release_devq(periph->path,
 1329                                 RELSIM_RELEASE_AFTER_TIMEOUT,
 1330                                 /*reduction*/0,
 1331                                 /*timeout*/duration_ms,
 1332                                 /*getcount_only*/0);
 1333         }
 1334 
 1335 }
 1336 
 1337 static int
 1338 camperiphscsistatuserror(union ccb *ccb, cam_flags camflags,
 1339                          u_int32_t sense_flags,
 1340                          int *openings, u_int32_t *relsim_flags,
 1341                          u_int32_t *timeout, const char **action_string)
 1342 {
 1343         int error;
 1344 
 1345         switch (ccb->csio.scsi_status) {
 1346         case SCSI_STATUS_OK:
 1347         case SCSI_STATUS_COND_MET:
 1348         case SCSI_STATUS_INTERMED:
 1349         case SCSI_STATUS_INTERMED_COND_MET:
 1350                 error = 0;
 1351                 break;
 1352         case SCSI_STATUS_CMD_TERMINATED:
 1353         case SCSI_STATUS_CHECK_COND:
 1354                 if (bootverbose)
 1355                         xpt_print(ccb->ccb_h.path, "SCSI status error\n");
 1356                 error = camperiphscsisenseerror(ccb,
 1357                                                 camflags,
 1358                                                 sense_flags,
 1359                                                 openings,
 1360                                                 relsim_flags,
 1361                                                 timeout,
 1362                                                 action_string);
 1363                 break;
 1364         case SCSI_STATUS_QUEUE_FULL:
 1365         {
 1366                 /* no decrement */
 1367                 struct ccb_getdevstats cgds;
 1368 
 1369                 /*
 1370                  * First off, find out what the current
 1371                  * transaction counts are.
 1372                  */
 1373                 xpt_setup_ccb(&cgds.ccb_h,
 1374                               ccb->ccb_h.path,
 1375                               CAM_PRIORITY_NORMAL);
 1376                 cgds.ccb_h.func_code = XPT_GDEV_STATS;
 1377                 xpt_action((union ccb *)&cgds);
 1378 
 1379                 /*
 1380                  * If we were the only transaction active, treat
 1381                  * the QUEUE FULL as if it were a BUSY condition.
 1382                  */
 1383                 if (cgds.dev_active != 0) {
 1384                         int total_openings;
 1385 
 1386                         /*
 1387                          * Reduce the number of openings to
 1388                          * be 1 less than the amount it took
 1389                          * to get a queue full bounded by the
 1390                          * minimum allowed tag count for this
 1391                          * device.
 1392                          */
 1393                         total_openings = cgds.dev_active + cgds.dev_openings;
 1394                         *openings = cgds.dev_active;
 1395                         if (*openings < cgds.mintags)
 1396                                 *openings = cgds.mintags;
 1397                         if (*openings < total_openings)
 1398                                 *relsim_flags = RELSIM_ADJUST_OPENINGS;
 1399                         else {
 1400                                 /*
 1401                                  * Some devices report queue full for
 1402                                  * temporary resource shortages.  For
 1403                                  * this reason, we allow a minimum
 1404                                  * tag count to be entered via a
 1405                                  * quirk entry to prevent the queue
 1406                                  * count on these devices from falling
 1407                                  * to a pessimisticly low value.  We
 1408                                  * still wait for the next successful
 1409                                  * completion, however, before queueing
 1410                                  * more transactions to the device.
 1411                                  */
 1412                                 *relsim_flags = RELSIM_RELEASE_AFTER_CMDCMPLT;
 1413                         }
 1414                         *timeout = 0;
 1415                         error = ERESTART;
 1416                         if (bootverbose) {
 1417                                 xpt_print(ccb->ccb_h.path, "Queue full\n");
 1418                         }
 1419                         break;
 1420                 }
 1421                 /* FALLTHROUGH */
 1422         }
 1423         case SCSI_STATUS_BUSY:
 1424                 /*
 1425                  * Restart the queue after either another
 1426                  * command completes or a 1 second timeout.
 1427                  */
 1428                 if (bootverbose) {
 1429                         xpt_print(ccb->ccb_h.path, "Device busy\n");
 1430                 }
 1431                 if (ccb->ccb_h.retry_count > 0) {
 1432                         ccb->ccb_h.retry_count--;
 1433                         error = ERESTART;
 1434                         *relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT
 1435                                       | RELSIM_RELEASE_AFTER_CMDCMPLT;
 1436                         *timeout = 1000;
 1437                 } else {
 1438                         error = EIO;
 1439                 }
 1440                 break;
 1441         case SCSI_STATUS_RESERV_CONFLICT:
 1442                 xpt_print(ccb->ccb_h.path, "Reservation conflict\n");
 1443                 error = EIO;
 1444                 break;
 1445         default:
 1446                 xpt_print(ccb->ccb_h.path, "SCSI status 0x%x\n",
 1447                     ccb->csio.scsi_status);
 1448                 error = EIO;
 1449                 break;
 1450         }
 1451         return (error);
 1452 }
 1453 
 1454 static int
 1455 camperiphscsisenseerror(union ccb *ccb, cam_flags camflags,
 1456                         u_int32_t sense_flags,
 1457                        int *openings, u_int32_t *relsim_flags,
 1458                        u_int32_t *timeout, const char **action_string)
 1459 {
 1460         struct cam_periph *periph;
 1461         union ccb *orig_ccb = ccb;
 1462         int error;
 1463 
 1464         periph = xpt_path_periph(ccb->ccb_h.path);
 1465         if (periph->flags &
 1466             (CAM_PERIPH_RECOVERY_INPROG | CAM_PERIPH_SENSE_INPROG)) {
 1467                 /*
 1468                  * If error recovery is already in progress, don't attempt
 1469                  * to process this error, but requeue it unconditionally
 1470                  * and attempt to process it once error recovery has
 1471                  * completed.  This failed command is probably related to
 1472                  * the error that caused the currently active error recovery
 1473                  * action so our  current recovery efforts should also
 1474                  * address this command.  Be aware that the error recovery
 1475                  * code assumes that only one recovery action is in progress
 1476                  * on a particular peripheral instance at any given time
 1477                  * (e.g. only one saved CCB for error recovery) so it is
 1478                  * imperitive that we don't violate this assumption.
 1479                  */
 1480                 error = ERESTART;
 1481         } else {
 1482                 scsi_sense_action err_action;
 1483                 struct ccb_getdev cgd;
 1484 
 1485                 /*
 1486                  * Grab the inquiry data for this device.
 1487                  */
 1488                 xpt_setup_ccb(&cgd.ccb_h, ccb->ccb_h.path, CAM_PRIORITY_NORMAL);
 1489                 cgd.ccb_h.func_code = XPT_GDEV_TYPE;
 1490                 xpt_action((union ccb *)&cgd);
 1491 
 1492                 if ((ccb->ccb_h.status & CAM_AUTOSNS_VALID) != 0)
 1493                         err_action = scsi_error_action(&ccb->csio,
 1494                                                        &cgd.inq_data,
 1495                                                        sense_flags);
 1496                 else if ((ccb->ccb_h.flags & CAM_DIS_AUTOSENSE) == 0)
 1497                         err_action = SS_REQSENSE;
 1498                 else
 1499                         err_action = SS_RETRY|SSQ_DECREMENT_COUNT|EIO;
 1500 
 1501                 error = err_action & SS_ERRMASK;
 1502 
 1503                 /*
 1504                  * If the recovery action will consume a retry,
 1505                  * make sure we actually have retries available.
 1506                  */
 1507                 if ((err_action & SSQ_DECREMENT_COUNT) != 0) {
 1508                         if (ccb->ccb_h.retry_count > 0 &&
 1509                             (periph->flags & CAM_PERIPH_INVALID) == 0)
 1510                                 ccb->ccb_h.retry_count--;
 1511                         else {
 1512                                 *action_string = "Retries exhausted";
 1513                                 goto sense_error_done;
 1514                         }
 1515                 }
 1516 
 1517                 if ((err_action & SS_MASK) >= SS_START) {
 1518                         /*
 1519                          * Do common portions of commands that
 1520                          * use recovery CCBs.
 1521                          */
 1522                         orig_ccb = xpt_alloc_ccb_nowait();
 1523                         if (orig_ccb == NULL) {
 1524                                 *action_string = "Can't allocate recovery CCB";
 1525                                 goto sense_error_done;
 1526                         }
 1527                         /*
 1528                          * Clear freeze flag for original request here, as
 1529                          * this freeze will be dropped as part of ERESTART.
 1530                          */
 1531                         ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
 1532                         bcopy(ccb, orig_ccb, sizeof(*orig_ccb));
 1533                 }
 1534 
 1535                 switch (err_action & SS_MASK) {
 1536                 case SS_NOP:
 1537                         *action_string = "No recovery action needed";
 1538                         error = 0;
 1539                         break;
 1540                 case SS_RETRY:
 1541                         *action_string = "Retrying command (per sense data)";
 1542                         error = ERESTART;
 1543                         break;
 1544                 case SS_FAIL:
 1545                         *action_string = "Unretryable error";
 1546                         break;
 1547                 case SS_START:
 1548                 {
 1549                         int le;
 1550                         if (SID_TYPE(&cgd.inq_data) == T_SEQUENTIAL) {
 1551                                 xpt_free_ccb(orig_ccb);
 1552                                 ccb->ccb_h.status |= CAM_DEV_QFRZN;
 1553                                 *action_string = "Will not autostart a "
 1554                                     "sequential access device";
 1555                                 err_action = SS_FAIL;
 1556                                 error = EIO;
 1557                                 break;
 1558                         }
 1559 
 1560                         /*
 1561                          * Send a start unit command to the device, and
 1562                          * then retry the command.
 1563                          */
 1564                         *action_string = "Attempting to start unit";
 1565                         periph->flags |= CAM_PERIPH_RECOVERY_INPROG;
 1566 
 1567                         /*
 1568                          * Check for removable media and set
 1569                          * load/eject flag appropriately.
 1570                          */
 1571                         if (SID_IS_REMOVABLE(&cgd.inq_data))
 1572                                 le = TRUE;
 1573                         else
 1574                                 le = FALSE;
 1575 
 1576                         scsi_start_stop(&ccb->csio,
 1577                                         /*retries*/1,
 1578                                         camperiphdone,
 1579                                         MSG_SIMPLE_Q_TAG,
 1580                                         /*start*/TRUE,
 1581                                         /*load/eject*/le,
 1582                                         /*immediate*/FALSE,
 1583                                         SSD_FULL_SIZE,
 1584                                         /*timeout*/50000);
 1585                         break;
 1586                 }
 1587                 case SS_TUR:
 1588                 {
 1589                         /*
 1590                          * Send a Test Unit Ready to the device.
 1591                          * If the 'many' flag is set, we send 120
 1592                          * test unit ready commands, one every half 
 1593                          * second.  Otherwise, we just send one TUR.
 1594                          * We only want to do this if the retry 
 1595                          * count has not been exhausted.
 1596                          */
 1597                         int retries;
 1598 
 1599                         if ((err_action & SSQ_MANY) != 0) {
 1600                                 *action_string = "Polling device for readiness";
 1601                                 retries = 120;
 1602                         } else {
 1603                                 *action_string = "Testing device for readiness";
 1604                                 retries = 1;
 1605                         }
 1606                         periph->flags |= CAM_PERIPH_RECOVERY_INPROG;
 1607                         scsi_test_unit_ready(&ccb->csio,
 1608                                              retries,
 1609                                              camperiphdone,
 1610                                              MSG_SIMPLE_Q_TAG,
 1611                                              SSD_FULL_SIZE,
 1612                                              /*timeout*/5000);
 1613 
 1614                         /*
 1615                          * Accomplish our 500ms delay by deferring
 1616                          * the release of our device queue appropriately.
 1617                          */
 1618                         *relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
 1619                         *timeout = 500;
 1620                         break;
 1621                 }
 1622                 case SS_REQSENSE:
 1623                 {
 1624                         *action_string = "Requesting SCSI sense data";
 1625                         periph->flags |= CAM_PERIPH_SENSE_INPROG;
 1626                         /*
 1627                          * Send a Request Sense to the device.  We
 1628                          * assume that we are in a contingent allegiance
 1629                          * condition so we do not tag this request.
 1630                          */
 1631                         scsi_request_sense(&ccb->csio, /*retries*/1,
 1632                                            camperiphsensedone,
 1633                                            &orig_ccb->csio.sense_data,
 1634                                            orig_ccb->csio.sense_len,
 1635                                            CAM_TAG_ACTION_NONE,
 1636                                            /*sense_len*/SSD_FULL_SIZE,
 1637                                            /*timeout*/5000);
 1638                         break;
 1639                 }
 1640                 default:
 1641                         panic("Unhandled error action %x", err_action);
 1642                 }
 1643                 
 1644                 if ((err_action & SS_MASK) >= SS_START) {
 1645                         /*
 1646                          * Drop the priority, so that the recovery
 1647                          * CCB is the first to execute.  Freeze the queue
 1648                          * after this command is sent so that we can
 1649                          * restore the old csio and have it queued in
 1650                          * the proper order before we release normal 
 1651                          * transactions to the device.
 1652                          */
 1653                         ccb->ccb_h.pinfo.priority--;
 1654                         ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
 1655                         ccb->ccb_h.saved_ccb_ptr = orig_ccb;
 1656                         ccb->ccb_h.recovery_depth = 0;
 1657                         error = ERESTART;
 1658                 }
 1659 
 1660 sense_error_done:
 1661                 if ((err_action & SSQ_PRINT_SENSE) != 0
 1662                  && (ccb->ccb_h.status & CAM_AUTOSNS_VALID) != 0)
 1663                         cam_error_print(orig_ccb, CAM_ESF_ALL, CAM_EPF_ALL);
 1664         }
 1665         return (error);
 1666 }
 1667 
 1668 /*
 1669  * Generic error handler.  Peripheral drivers usually filter
 1670  * out the errors that they handle in a unique mannor, then
 1671  * call this function.
 1672  */
 1673 int
 1674 cam_periph_error(union ccb *ccb, cam_flags camflags,
 1675                  u_int32_t sense_flags, union ccb *save_ccb)
 1676 {
 1677         struct cam_periph *periph;
 1678         const char *action_string;
 1679         cam_status  status;
 1680         int         frozen;
 1681         int         error, printed = 0;
 1682         int         openings;
 1683         u_int32_t   relsim_flags;
 1684         u_int32_t   timeout = 0;
 1685 
 1686         periph = xpt_path_periph(ccb->ccb_h.path);
 1687         action_string = NULL;
 1688         status = ccb->ccb_h.status;
 1689         frozen = (status & CAM_DEV_QFRZN) != 0;
 1690         status &= CAM_STATUS_MASK;
 1691         openings = relsim_flags = 0;
 1692 
 1693         switch (status) {
 1694         case CAM_REQ_CMP:
 1695                 error = 0;
 1696                 break;
 1697         case CAM_SCSI_STATUS_ERROR:
 1698                 error = camperiphscsistatuserror(ccb,
 1699                                                  camflags,
 1700                                                  sense_flags,
 1701                                                  &openings,
 1702                                                  &relsim_flags,
 1703                                                  &timeout,
 1704                                                  &action_string);
 1705                 break;
 1706         case CAM_AUTOSENSE_FAIL:
 1707                 xpt_print(ccb->ccb_h.path, "AutoSense failed\n");
 1708                 error = EIO;    /* we have to kill the command */
 1709                 break;
 1710         case CAM_ATA_STATUS_ERROR:
 1711                 if (bootverbose && printed == 0) {
 1712                         xpt_print(ccb->ccb_h.path, "ATA status error\n");
 1713                         cam_error_print(ccb, CAM_ESF_ALL, CAM_EPF_ALL);
 1714                         printed++;
 1715                 }
 1716                 /* FALLTHROUGH */
 1717         case CAM_REQ_CMP_ERR:
 1718                 if (bootverbose && printed == 0) {
 1719                         xpt_print(ccb->ccb_h.path,
 1720                             "Request completed with CAM_REQ_CMP_ERR\n");
 1721                         printed++;
 1722                 }
 1723                 /* FALLTHROUGH */
 1724         case CAM_CMD_TIMEOUT:
 1725                 if (bootverbose && printed == 0) {
 1726                         xpt_print(ccb->ccb_h.path, "Command timed out\n");
 1727                         printed++;
 1728                 }
 1729                 /* FALLTHROUGH */
 1730         case CAM_UNEXP_BUSFREE:
 1731                 if (bootverbose && printed == 0) {
 1732                         xpt_print(ccb->ccb_h.path, "Unexpected Bus Free\n");
 1733                         printed++;
 1734                 }
 1735                 /* FALLTHROUGH */
 1736         case CAM_UNCOR_PARITY:
 1737                 if (bootverbose && printed == 0) {
 1738                         xpt_print(ccb->ccb_h.path,
 1739                             "Uncorrected parity error\n");
 1740                         printed++;
 1741                 }
 1742                 /* FALLTHROUGH */
 1743         case CAM_DATA_RUN_ERR:
 1744                 if (bootverbose && printed == 0) {
 1745                         xpt_print(ccb->ccb_h.path, "Data overrun\n");
 1746                         printed++;
 1747                 }
 1748                 /* decrement the number of retries */
 1749                 if (ccb->ccb_h.retry_count > 0 &&
 1750                     (periph->flags & CAM_PERIPH_INVALID) == 0) {
 1751                         ccb->ccb_h.retry_count--;
 1752                         error = ERESTART;
 1753                 } else {
 1754                         action_string = "Retries exhausted";
 1755                         error = EIO;
 1756                 }
 1757                 break;
 1758         case CAM_UA_ABORT:
 1759         case CAM_UA_TERMIO:
 1760         case CAM_MSG_REJECT_REC:
 1761                 /* XXX Don't know that these are correct */
 1762                 error = EIO;
 1763                 break;
 1764         case CAM_SEL_TIMEOUT:
 1765                 if ((camflags & CAM_RETRY_SELTO) != 0) {
 1766                         if (ccb->ccb_h.retry_count > 0 &&
 1767                             (periph->flags & CAM_PERIPH_INVALID) == 0) {
 1768 
 1769                                 ccb->ccb_h.retry_count--;
 1770                                 error = ERESTART;
 1771                                 if (bootverbose && printed == 0) {
 1772                                         xpt_print(ccb->ccb_h.path,
 1773                                             "Selection timeout\n");
 1774                                         printed++;
 1775                                 }
 1776 
 1777                                 /*
 1778                                  * Wait a bit to give the device
 1779                                  * time to recover before we try again.
 1780                                  */
 1781                                 relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
 1782                                 timeout = periph_selto_delay;
 1783                                 break;
 1784                         }
 1785                         action_string = "Retries exhausted";
 1786                 }
 1787                 /* FALLTHROUGH */
 1788         case CAM_DEV_NOT_THERE:
 1789         {
 1790                 struct cam_path *newpath;
 1791                 lun_id_t lun_id;
 1792 
 1793                 error = ENXIO;
 1794 
 1795                 /*
 1796                  * For a selection timeout, we consider all of the LUNs on
 1797                  * the target to be gone.  If the status is CAM_DEV_NOT_THERE,
 1798                  * then we only get rid of the device(s) specified by the
 1799                  * path in the original CCB.
 1800                  */
 1801                 if (status == CAM_DEV_NOT_THERE)
 1802                         lun_id = xpt_path_lun_id(ccb->ccb_h.path);
 1803                 else
 1804                         lun_id = CAM_LUN_WILDCARD;
 1805 
 1806                 /* Should we do more if we can't create the path?? */
 1807                 if (xpt_create_path(&newpath, periph,
 1808                                     xpt_path_path_id(ccb->ccb_h.path),
 1809                                     xpt_path_target_id(ccb->ccb_h.path),
 1810                                     lun_id) != CAM_REQ_CMP) 
 1811                         break;
 1812 
 1813                 /*
 1814                  * Let peripheral drivers know that this device has gone
 1815                  * away.
 1816                  */
 1817                 xpt_async(AC_LOST_DEVICE, newpath, NULL);
 1818                 xpt_free_path(newpath);
 1819                 break;
 1820         }
 1821         case CAM_REQ_INVALID:
 1822         case CAM_PATH_INVALID:
 1823         case CAM_NO_HBA:
 1824         case CAM_PROVIDE_FAIL:
 1825         case CAM_REQ_TOO_BIG:
 1826         case CAM_LUN_INVALID:
 1827         case CAM_TID_INVALID:
 1828                 error = EINVAL;
 1829                 break;
 1830         case CAM_SCSI_BUS_RESET:
 1831         case CAM_BDR_SENT:
 1832                 /*
 1833                  * Commands that repeatedly timeout and cause these
 1834                  * kinds of error recovery actions, should return
 1835                  * CAM_CMD_TIMEOUT, which allows us to safely assume
 1836                  * that this command was an innocent bystander to
 1837                  * these events and should be unconditionally
 1838                  * retried.
 1839                  */
 1840                 if (bootverbose && printed == 0) {
 1841                         xpt_print_path(ccb->ccb_h.path);
 1842                         if (status == CAM_BDR_SENT)
 1843                                 printf("Bus Device Reset sent\n");
 1844                         else
 1845                                 printf("Bus Reset issued\n");
 1846                         printed++;
 1847                 }
 1848                 /* FALLTHROUGH */
 1849         case CAM_REQUEUE_REQ:
 1850                 /* Unconditional requeue */
 1851                 if (bootverbose && printed == 0) {
 1852                         xpt_print(ccb->ccb_h.path, "Request requeued\n");
 1853                         printed++;
 1854                 }
 1855                 if ((periph->flags & CAM_PERIPH_INVALID) == 0)
 1856                         error = ERESTART;
 1857                 else {
 1858                         action_string = "Retries exhausted";
 1859                         error = EIO;
 1860                 }
 1861                 break;
 1862         case CAM_RESRC_UNAVAIL:
 1863                 /* Wait a bit for the resource shortage to abate. */
 1864                 timeout = periph_noresrc_delay;
 1865                 /* FALLTHROUGH */
 1866         case CAM_BUSY:
 1867                 if (timeout == 0) {
 1868                         /* Wait a bit for the busy condition to abate. */
 1869                         timeout = periph_busy_delay;
 1870                 }
 1871                 relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
 1872                 /* FALLTHROUGH */
 1873         default:
 1874                 /* decrement the number of retries */
 1875                 if (ccb->ccb_h.retry_count > 0 &&
 1876                     (periph->flags & CAM_PERIPH_INVALID) == 0) {
 1877                         ccb->ccb_h.retry_count--;
 1878                         error = ERESTART;
 1879                         if (bootverbose && printed == 0) {
 1880                                 xpt_print(ccb->ccb_h.path, "CAM status 0x%x\n",
 1881                                     status);
 1882                                 printed++;
 1883                         }
 1884                 } else {
 1885                         error = EIO;
 1886                         action_string = "Retries exhausted";
 1887                 }
 1888                 break;
 1889         }
 1890 
 1891         /*
 1892          * If we have and error and are booting verbosely, whine
 1893          * *unless* this was a non-retryable selection timeout.
 1894          */
 1895         if (error != 0 && bootverbose &&
 1896             !(status == CAM_SEL_TIMEOUT && (camflags & CAM_RETRY_SELTO) == 0)) {
 1897                 if (error != ERESTART) {
 1898                         if (action_string == NULL)
 1899                                 action_string = "Unretryable error";
 1900                         xpt_print(ccb->ccb_h.path, "Error %d, %s\n",
 1901                             error, action_string);
 1902                 } else if (action_string != NULL)
 1903                         xpt_print(ccb->ccb_h.path, "%s\n", action_string);
 1904                 else
 1905                         xpt_print(ccb->ccb_h.path, "Retrying command\n");
 1906         }
 1907 
 1908         /* Attempt a retry */
 1909         if (error == ERESTART || error == 0) {
 1910                 if (frozen != 0)
 1911                         ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
 1912                 if (error == ERESTART)
 1913                         xpt_action(ccb);
 1914                 if (frozen != 0)
 1915                         cam_release_devq(ccb->ccb_h.path,
 1916                                          relsim_flags,
 1917                                          openings,
 1918                                          timeout,
 1919                                          /*getcount_only*/0);
 1920         }
 1921 
 1922         return (error);
 1923 }

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