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