sys/bus/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  * $FreeBSD: src/sys/cam/cam_periph.c,v 1.24.2.3 2003/01/25 19:04:40 dillon Exp $
  30  * $DragonFly: src/sys/bus/cam/cam_periph.c,v 1.3 2003/06/26 20:27:44 dillon Exp $
  31  */
  32
  33 #include <sys/param.h>
  34 #include <sys/systm.h>
  35 #include <sys/types.h>
  36 #include <sys/malloc.h>
  37 #include <sys/linker_set.h>
  38 #include <sys/buf.h>
  39 #include <sys/proc.h>
  40 #include <sys/devicestat.h>
  41 #include <sys/bus.h>
  42 #include <vm/vm.h>
  43 #include <vm/vm_extern.h>
  44
  45 #include <cam/cam.h>
  46 #include <cam/cam_ccb.h>
  47 #include <cam/cam_xpt_periph.h>
  48 #include <cam/cam_periph.h>
  49 #include <cam/cam_debug.h>
  50
  51 #include <cam/scsi/scsi_all.h>
  52 #include <cam/scsi/scsi_message.h>
  53 #include <cam/scsi/scsi_da.h>
  54 #include <cam/scsi/scsi_pass.h>
  55
  56 static  u_int           camperiphnextunit(struct periph_driver *p_drv,
  57                                           u_int newunit, int wired,
  58                                           path_id_t pathid, target_id_t target,
  59                                           lun_id_t lun);
  60 static  u_int           camperiphunit(struct periph_driver *p_drv,
  61                                       path_id_t pathid, target_id_t target,
  62                                       lun_id_t lun);
  63 static  void            camperiphdone(struct cam_periph *periph,
  64                                         union ccb *done_ccb);
  65 static  void            camperiphfree(struct cam_periph *periph);
  66
  67 cam_status
  68 cam_periph_alloc(periph_ctor_t *periph_ctor,
  69                  periph_oninv_t *periph_oninvalidate,
  70                  periph_dtor_t *periph_dtor, periph_start_t *periph_start,
  71                  char *name, cam_periph_type type, struct cam_path *path,
  72                  ac_callback_t *ac_callback, ac_code code, void *arg)
  73 {
  74         struct          periph_driver **p_drv;
  75         struct          cam_periph *periph;
  76         struct          cam_periph *cur_periph;
  77         path_id_t       path_id;
  78         target_id_t     target_id;
  79         lun_id_t        lun_id;
  80         cam_status      status;
  81         u_int           init_level;
  82         int s;
  83
  84         init_level = 0;
  85         /*
  86          * Handle Hot-Plug scenarios.  If there is already a peripheral
  87          * of our type assigned to this path, we are likely waiting for
  88          * final close on an old, invalidated, peripheral.  If this is
  89          * the case, queue up a deferred call to the peripheral's async
  90          * handler.  If it looks like a mistaken re-alloation, complain.
  91          */
  92         if ((periph = cam_periph_find(path, name)) != NULL) {
  93
  94                 if ((periph->flags & CAM_PERIPH_INVALID) != 0
  95                  && (periph->flags & CAM_PERIPH_NEW_DEV_FOUND) == 0) {
  96                         periph->flags |= CAM_PERIPH_NEW_DEV_FOUND;
  97                         periph->deferred_callback = ac_callback;
  98                         periph->deferred_ac = code;
  99                         return (CAM_REQ_INPROG);
 100                 } else {
 101                         printf("cam_periph_alloc: attempt to re-allocate "
 102                                "valid device %s%d rejected\n",
 103                                periph->periph_name, periph->unit_number);
 104                 }
 105                 return (CAM_REQ_INVALID);
 106         }
 107
 108         periph = (struct cam_periph *)malloc(sizeof(*periph), M_DEVBUF,
 109                                              M_NOWAIT);
 110
 111         if (periph == NULL)
 112                 return (CAM_RESRC_UNAVAIL);
 113
 114         init_level++;
 115
 116         for (p_drv = (struct periph_driver **)periphdriver_set.ls_items;
 117              *p_drv != NULL; p_drv++) {
 118                 if (strcmp((*p_drv)->driver_name, name) == 0)
 119                         break;
 120         }
 121
 122         path_id = xpt_path_path_id(path);
 123         target_id = xpt_path_target_id(path);
 124         lun_id = xpt_path_lun_id(path);
 125         bzero(periph, sizeof(*periph));
 126         cam_init_pinfo(&periph->pinfo);
 127         periph->periph_start = periph_start;
 128         periph->periph_dtor = periph_dtor;
 129         periph->periph_oninval = periph_oninvalidate;
 130         periph->type = type;
 131         periph->periph_name = name;
 132         periph->unit_number = camperiphunit(*p_drv, path_id, target_id, lun_id);
 133         periph->immediate_priority = CAM_PRIORITY_NONE;
 134         periph->refcount = 0;
 135         SLIST_INIT(&periph->ccb_list);
 136         status = xpt_create_path(&path, periph, path_id, target_id, lun_id);
 137         if (status != CAM_REQ_CMP)
 138                 goto failure;
 139
 140         periph->path = path;
 141         init_level++;
 142
 143         status = xpt_add_periph(periph);
 144
 145         if (status != CAM_REQ_CMP)
 146                 goto failure;
 147
 148         s = splsoftcam();
 149         cur_periph = TAILQ_FIRST(&(*p_drv)->units);
 150         while (cur_periph != NULL
 151             && cur_periph->unit_number < periph->unit_number)
 152                 cur_periph = TAILQ_NEXT(cur_periph, unit_links);
 153
 154         if (cur_periph != NULL)
 155                 TAILQ_INSERT_BEFORE(cur_periph, periph, unit_links);
 156         else {
 157                 TAILQ_INSERT_TAIL(&(*p_drv)->units, periph, unit_links);
 158                 (*p_drv)->generation++;
 159         }
 160
 161         splx(s);
 162
 163         init_level++;
 164
 165         status = periph_ctor(periph, arg);
 166
 167         if (status == CAM_REQ_CMP)
 168                 init_level++;
 169
 170 failure:
 171         switch (init_level) {
 172         case 4:
 173                 /* Initialized successfully */
 174                 break;
 175         case 3:
 176                 s = splsoftcam();
 177                 TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links);
 178                 splx(s);
 179                 xpt_remove_periph(periph);
 180         case 2:
 181                 xpt_free_path(periph->path);
 182         case 1:
 183                 free(periph, M_DEVBUF);
 184         case 0:
 185                 /* No cleanup to perform. */
 186                 break;
 187         default:
 188                 panic("cam_periph_alloc: Unkown init level");
 189         }
 190         return(status);
 191 }
 192
 193 /*
 194  * Find a peripheral structure with the specified path, target, lun,
 195  * and (optionally) type.  If the name is NULL, this function will return
 196  * the first peripheral driver that matches the specified path.
 197  */
 198 struct cam_periph *
 199 cam_periph_find(struct cam_path *path, char *name)
 200 {
 201         struct periph_driver **p_drv;
 202         struct cam_periph *periph;
 203         int s;
 204
 205         for (p_drv = (struct periph_driver **)periphdriver_set.ls_items;
 206              *p_drv != NULL; p_drv++) {
 207
 208                 if (name != NULL && (strcmp((*p_drv)->driver_name, name) != 0))
 209                         continue;
 210
 211                 s = splsoftcam();
 212                 for (periph = TAILQ_FIRST(&(*p_drv)->units); periph != NULL;
 213                      periph = TAILQ_NEXT(periph, unit_links)) {
 214                         if (xpt_path_comp(periph->path, path) == 0) {
 215                                 splx(s);
 216                                 return(periph);
 217                         }
 218                 }
 219                 splx(s);
 220                 if (name != NULL)
 221                         return(NULL);
 222         }
 223         return(NULL);
 224 }
 225
 226 cam_status
 227 cam_periph_acquire(struct cam_periph *periph)
 228 {
 229         int s;
 230
 231         if (periph == NULL)
 232                 return(CAM_REQ_CMP_ERR);
 233
 234         s = splsoftcam();
 235         periph->refcount++;
 236         splx(s);
 237
 238         return(CAM_REQ_CMP);
 239 }
 240
 241 void
 242 cam_periph_release(struct cam_periph *periph)
 243 {
 244         int s;
 245
 246         if (periph == NULL)
 247                 return;
 248
 249         s = splsoftcam();
 250         if ((--periph->refcount == 0)
 251          && (periph->flags & CAM_PERIPH_INVALID)) {
 252                 camperiphfree(periph);
 253         }
 254         splx(s);
 255
 256 }
 257
 258 /*
 259  * Look for the next unit number that is not currently in use for this
 260  * peripheral type starting at "newunit".  Also exclude unit numbers that
 261  * are reserved by for future "hardwiring" unless we already know that this
 262  * is a potential wired device.  Only assume that the device is "wired" the
 263  * first time through the loop since after that we'll be looking at unit
 264  * numbers that did not match a wiring entry.
 265  */
 266 static u_int
 267 camperiphnextunit(struct periph_driver *p_drv, u_int newunit, int wired,
 268                   path_id_t pathid, target_id_t target, lun_id_t lun)
 269 {
 270         struct  cam_periph *periph;
 271         char    *periph_name, *strval;
 272         int     s;
 273         int     i, val, dunit;
 274         const char *dname;
 275
 276         s = splsoftcam();
 277         periph_name = p_drv->driver_name;
 278         for (;;newunit++) {
 279
 280                 for (periph = TAILQ_FIRST(&p_drv->units);
 281                      periph != NULL && periph->unit_number != newunit;
 282                      periph = TAILQ_NEXT(periph, unit_links))
 283                         ;
 284
 285                 if (periph != NULL && periph->unit_number == newunit) {
 286                         if (wired != 0) {
 287                                 xpt_print_path(periph->path);
 288                                 printf("Duplicate Wired Device entry!\n");
 289                                 xpt_print_path(periph->path);
 290                                 printf("Second device (%s device at scbus%d "
 291                                        "target %d lun %d) will not be wired\n",
 292                                        periph_name, pathid, target, lun);
 293                                 wired = 0;
 294                         }
 295                         continue;
 296                 }
 297                 if (wired)
 298                         break;
 299
 300                 /*
 301                  * Don't match entries like "da 4" as a wired down
 302                  * device, but do match entries like "da 4 target 5"
 303                  * or even "da 4 scbus 1".
 304                  */
 305                 i = -1;
 306                 while ((i = resource_locate(i, periph_name)) != -1) {
 307                         dname = resource_query_name(i);
 308                         dunit = resource_query_unit(i);
 309                         /* if no "target" and no specific scbus, skip */
 310                         if (resource_int_value(dname, dunit, "target", &val) &&
 311                             (resource_string_value(dname, dunit, "at",&strval)||
 312                              strcmp(strval, "scbus") == 0))
 313                                 continue;
 314                         if (newunit == dunit)
 315                                 break;
 316                 }
 317                 if (i == -1)
 318                         break;
 319         }
 320         splx(s);
 321         return (newunit);
 322 }
 323
 324 static u_int
 325 camperiphunit(struct periph_driver *p_drv, path_id_t pathid,
 326               target_id_t target, lun_id_t lun)
 327 {
 328         u_int   unit;
 329         int     hit, i, val, dunit;
 330         const char *dname;
 331         char    pathbuf[32], *strval, *periph_name;
 332
 333         unit = 0;
 334
 335         periph_name = p_drv->driver_name;
 336         snprintf(pathbuf, sizeof(pathbuf), "scbus%d", pathid);
 337         i = -1;
 338         for (hit = 0; (i = resource_locate(i, periph_name)) != -1; hit = 0) {
 339                 dname = resource_query_name(i);
 340                 dunit = resource_query_unit(i);
 341                 if (resource_string_value(dname, dunit, "at", &strval) == 0) {
 342                         if (strcmp(strval, pathbuf) != 0)
 343                                 continue;
 344                         hit++;
 345                 }
 346                 if (resource_int_value(dname, dunit, "target", &val) == 0) {
 347                         if (val != target)
 348                                 continue;
 349                         hit++;
 350                 }
 351                 if (resource_int_value(dname, dunit, "lun", &val) == 0) {
 352                         if (val != lun)
 353                                 continue;
 354                         hit++;
 355                 }
 356                 if (hit != 0) {
 357                         unit = dunit;
 358                         break;
 359                 }
 360         }
 361
 362         /*
 363          * Either start from 0 looking for the next unit or from
 364          * the unit number given in the resource config.  This way,
 365          * if we have wildcard matches, we don't return the same
 366          * unit number twice.
 367          */
 368         unit = camperiphnextunit(p_drv, unit, /*wired*/hit, pathid,
 369                                  target, lun);
 370
 371         return (unit);
 372 }
 373
 374 void
 375 cam_periph_invalidate(struct cam_periph *periph)
 376 {
 377         int s;
 378
 379         s = splsoftcam();
 380         /*
 381          * We only call this routine the first time a peripheral is
 382          * invalidated.  The oninvalidate() routine is always called at
 383          * splsoftcam().
 384          */
 385         if (((periph->flags & CAM_PERIPH_INVALID) == 0)
 386          && (periph->periph_oninval != NULL))
 387                 periph->periph_oninval(periph);
 388
 389         periph->flags |= CAM_PERIPH_INVALID;
 390         periph->flags &= ~CAM_PERIPH_NEW_DEV_FOUND;
 391
 392         if (periph->refcount == 0)
 393                 camperiphfree(periph);
 394         else if (periph->refcount < 0)
 395                 printf("cam_invalidate_periph: refcount < 0!!\n");
 396         splx(s);
 397 }
 398
 399 static void
 400 camperiphfree(struct cam_periph *periph)
 401 {
 402         int s;
 403         struct periph_driver **p_drv;
 404
 405         for (p_drv = (struct periph_driver **)periphdriver_set.ls_items;
 406              *p_drv != NULL; p_drv++) {
 407                 if (strcmp((*p_drv)->driver_name, periph->periph_name) == 0)
 408                         break;
 409         }
 410
 411         if (periph->periph_dtor != NULL)
 412                 periph->periph_dtor(periph);
 413
 414         s = splsoftcam();
 415         TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links);
 416         (*p_drv)->generation++;
 417         splx(s);
 418
 419         xpt_remove_periph(periph);
 420
 421         if (periph->flags & CAM_PERIPH_NEW_DEV_FOUND) {
 422                 union ccb ccb;
 423                 void *arg;
 424
 425                 switch (periph->deferred_ac) {
 426                 case AC_FOUND_DEVICE:
 427                         ccb.ccb_h.func_code = XPT_GDEV_TYPE;
 428                         xpt_setup_ccb(&ccb.ccb_h, periph->path, /*priority*/ 1);
 429                         xpt_action(&ccb);
 430                         arg = &ccb;
 431                         break;
 432                 case AC_PATH_REGISTERED:
 433                         ccb.ccb_h.func_code = XPT_PATH_INQ;
 434                         xpt_setup_ccb(&ccb.ccb_h, periph->path, /*priority*/ 1);
 435                         xpt_action(&ccb);
 436                         arg = &ccb;
 437                         break;
 438                 default:
 439                         arg = NULL;
 440                         break;
 441                 }
 442                 periph->deferred_callback(NULL, periph->deferred_ac,
 443                                           periph->path, arg);
 444         }
 445         xpt_free_path(periph->path);
 446         free(periph, M_DEVBUF);
 447 }
 448
 449 /*
 450  * Wait interruptibly for an exclusive lock.
 451  */
 452 int
 453 cam_periph_lock(struct cam_periph *periph, int priority)
 454 {
 455         int error;
 456
 457         while ((periph->flags & CAM_PERIPH_LOCKED) != 0) {
 458                 periph->flags |= CAM_PERIPH_LOCK_WANTED;
 459                 if ((error = tsleep(periph, priority, "caplck", 0)) != 0)
 460                         return error;
 461         }
 462
 463         if (cam_periph_acquire(periph) != CAM_REQ_CMP)
 464                 return(ENXIO);
 465
 466         periph->flags |= CAM_PERIPH_LOCKED;
 467         return 0;
 468 }
 469
 470 /*
 471  * Unlock and wake up any waiters.
 472  */
 473 void
 474 cam_periph_unlock(struct cam_periph *periph)
 475 {
 476         periph->flags &= ~CAM_PERIPH_LOCKED;
 477         if ((periph->flags & CAM_PERIPH_LOCK_WANTED) != 0) {
 478                 periph->flags &= ~CAM_PERIPH_LOCK_WANTED;
 479                 wakeup(periph);
 480         }
 481
 482         cam_periph_release(periph);
 483 }
 484
 485 /*
 486  * Map user virtual pointers into kernel virtual address space, so we can
 487  * access the memory.  This won't work on physical pointers, for now it's
 488  * up to the caller to check for that.  (XXX KDM -- should we do that here
 489  * instead?)  This also only works for up to MAXPHYS memory.  Since we use
 490  * buffers to map stuff in and out, we're limited to the buffer size.
 491  */
 492 int
 493 cam_periph_mapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo)
 494 {
 495         int numbufs, i, j;
 496         int flags[CAM_PERIPH_MAXMAPS];
 497         u_int8_t **data_ptrs[CAM_PERIPH_MAXMAPS];
 498         u_int32_t lengths[CAM_PERIPH_MAXMAPS];
 499         u_int32_t dirs[CAM_PERIPH_MAXMAPS];
 500
 501         switch(ccb->ccb_h.func_code) {
 502         case XPT_DEV_MATCH:
 503                 if (ccb->cdm.match_buf_len == 0) {
 504                         printf("cam_periph_mapmem: invalid match buffer "
 505                                "length 0\n");
 506                         return(EINVAL);
 507                 }
 508                 if (ccb->cdm.pattern_buf_len > 0) {
 509                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.patterns;
 510                         lengths[0] = ccb->cdm.pattern_buf_len;
 511                         dirs[0] = CAM_DIR_OUT;
 512                         data_ptrs[1] = (u_int8_t **)&ccb->cdm.matches;
 513                         lengths[1] = ccb->cdm.match_buf_len;
 514                         dirs[1] = CAM_DIR_IN;
 515                         numbufs = 2;
 516                 } else {
 517                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.matches;
 518                         lengths[0] = ccb->cdm.match_buf_len;
 519                         dirs[0] = CAM_DIR_IN;
 520                         numbufs = 1;
 521                 }
 522                 break;
 523         case XPT_SCSI_IO:
 524         case XPT_CONT_TARGET_IO:
 525                 if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_NONE)
 526                         return(0);
 527
 528                 data_ptrs[0] = &ccb->csio.data_ptr;
 529                 lengths[0] = ccb->csio.dxfer_len;
 530                 dirs[0] = ccb->ccb_h.flags & CAM_DIR_MASK;
 531                 numbufs = 1;
 532                 break;
 533         default:
 534                 return(EINVAL);
 535                 break; /* NOTREACHED */
 536         }
 537
 538         /*
 539          * Check the transfer length and permissions first, so we don't
 540          * have to unmap any previously mapped buffers.
 541          */
 542         for (i = 0; i < numbufs; i++) {
 543
 544                 flags[i] = 0;
 545
 546                 /*
 547                  * The userland data pointer passed in may not be page
 548                  * aligned.  vmapbuf() truncates the address to a page
 549                  * boundary, so if the address isn't page aligned, we'll
 550                  * need enough space for the given transfer length, plus
 551                  * whatever extra space is necessary to make it to the page
 552                  * boundary.
 553                  */
 554                 if ((lengths[i] +
 555                     (((vm_offset_t)(*data_ptrs[i])) & PAGE_MASK)) > DFLTPHYS){
 556                         printf("cam_periph_mapmem: attempt to map %lu bytes, "
 557                                "which is greater than DFLTPHYS(%d)\n",
 558                                (long)(lengths[i] +
 559                                (((vm_offset_t)(*data_ptrs[i])) & PAGE_MASK)),
 560                                DFLTPHYS);
 561                         return(E2BIG);
 562                 }
 563
 564                 if (dirs[i] & CAM_DIR_OUT) {
 565                         flags[i] = B_WRITE;
 566                         if (!useracc(*data_ptrs[i], lengths[i],
 567                                      VM_PROT_READ)) {
 568                                 printf("cam_periph_mapmem: error, "
 569                                         "address %p, length %lu isn't "
 570                                         "user accessible for READ\n",
 571                                         (void *)*data_ptrs[i],
 572                                         (u_long)lengths[i]);
 573                                 return(EACCES);
 574                         }
 575                 }
 576
 577                 /*
 578                  * XXX this check is really bogus, since B_WRITE currently
 579                  * is all 0's, and so it is "set" all the time.
 580                  */
 581                 if (dirs[i] & CAM_DIR_IN) {
 582                         flags[i] |= B_READ;
 583                         if (!useracc(*data_ptrs[i], lengths[i],
 584                                      VM_PROT_WRITE)) {
 585                                 printf("cam_periph_mapmem: error, "
 586                                         "address %p, length %lu isn't "
 587                                         "user accessible for WRITE\n",
 588                                         (void *)*data_ptrs[i],
 589                                         (u_long)lengths[i]);
 590
 591                                 return(EACCES);
 592                         }
 593                 }
 594
 595         }
 596
 597         for (i = 0; i < numbufs; i++) {
 598                 /*
 599                  * Get the buffer.
 600                  */
 601                 mapinfo->bp[i] = getpbuf(NULL);
 602
 603                 /* save the buffer's data address */
 604                 mapinfo->bp[i]->b_saveaddr = mapinfo->bp[i]->b_data;
 605
 606                 /* put our pointer in the data slot */
 607                 mapinfo->bp[i]->b_data = *data_ptrs[i];
 608
 609                 /* set the transfer length, we know it's < DFLTPHYS */
 610                 mapinfo->bp[i]->b_bufsize = lengths[i];
 611
 612                 /* set the flags */
 613                 mapinfo->bp[i]->b_flags = flags[i] | B_PHYS;
 614
 615                 /* map the buffer into kernel memory */
 616                 if (vmapbuf(mapinfo->bp[i]) < 0) {
 617                         printf("cam_periph_mapmem: error, "
 618                                 "address %p, length %lu isn't "
 619                                 "user accessible any more\n",
 620                                 (void *)*data_ptrs[i],
 621                                 (u_long)lengths[i]);
 622                         for (j = 0; j < i; ++j) {
 623                                 *data_ptrs[j] = mapinfo->bp[j]->b_saveaddr;
 624                                 mapinfo->bp[j]->b_flags &= ~B_PHYS;
 625                                 relpbuf(mapinfo->bp[j], NULL);
 626                         }
 627                         return(EACCES);
 628                 }
 629
 630                 /* set our pointer to the new mapped area */
 631                 *data_ptrs[i] = mapinfo->bp[i]->b_data;
 632
 633                 mapinfo->num_bufs_used++;
 634         }
 635
 636         return(0);
 637 }
 638
 639 /*
 640  * Unmap memory segments mapped into kernel virtual address space by
 641  * cam_periph_mapmem().
 642  */
 643 void
 644 cam_periph_unmapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo)
 645 {
 646         int numbufs, i;
 647         u_int8_t **data_ptrs[CAM_PERIPH_MAXMAPS];
 648
 649         if (mapinfo->num_bufs_used <= 0) {
 650                 /* allow ourselves to be swapped once again */
 651                 return;
 652         }
 653
 654         switch (ccb->ccb_h.func_code) {
 655         case XPT_DEV_MATCH:
 656                 numbufs = min(mapinfo->num_bufs_used, 2);
 657
 658                 if (numbufs == 1) {
 659                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.matches;
 660                 } else {
 661                         data_ptrs[0] = (u_int8_t **)&ccb->cdm.patterns;
 662                         data_ptrs[1] = (u_int8_t **)&ccb->cdm.matches;
 663                 }
 664                 break;
 665         case XPT_SCSI_IO:
 666         case XPT_CONT_TARGET_IO:
 667                 data_ptrs[0] = &ccb->csio.data_ptr;
 668                 numbufs = min(mapinfo->num_bufs_used, 1);
 669                 break;
 670         default:
 671                 /* allow ourselves to be swapped once again */
 672                 return;
 673                 break; /* NOTREACHED */
 674         }
 675
 676         for (i = 0; i < numbufs; i++) {
 677                 /* Set the user's pointer back to the original value */
 678                 *data_ptrs[i] = mapinfo->bp[i]->b_saveaddr;
 679
 680                 /* unmap the buffer */
 681                 vunmapbuf(mapinfo->bp[i]);
 682
 683                 /* clear the flags we set above */
 684                 mapinfo->bp[i]->b_flags &= ~B_PHYS;
 685
 686                 /* release the buffer */
 687                 relpbuf(mapinfo->bp[i], NULL);
 688         }
 689
 690         /* allow ourselves to be swapped once again */
 691 }
 692
 693 union ccb *
 694 cam_periph_getccb(struct cam_periph *periph, u_int32_t priority)
 695 {
 696         struct ccb_hdr *ccb_h;
 697         int s;
 698
 699         CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("entering cdgetccb\n"));
 700
 701         s = splsoftcam();
 702
 703         while (periph->ccb_list.slh_first == NULL) {
 704                 if (periph->immediate_priority > priority)
 705                         periph->immediate_priority = priority;
 706                 xpt_schedule(periph, priority);
 707                 if ((periph->ccb_list.slh_first != NULL)
 708                  && (periph->ccb_list.slh_first->pinfo.priority == priority))
 709                         break;
 710                 tsleep(&periph->ccb_list, PRIBIO, "cgticb", 0);
 711         }
 712
 713         ccb_h = periph->ccb_list.slh_first;
 714         SLIST_REMOVE_HEAD(&periph->ccb_list, periph_links.sle);
 715         splx(s);
 716         return ((union ccb *)ccb_h);
 717 }
 718
 719 void
 720 cam_periph_ccbwait(union ccb *ccb)
 721 {
 722         int s;
 723
 724         s = splsoftcam();
 725         if ((ccb->ccb_h.pinfo.index != CAM_UNQUEUED_INDEX)
 726          || ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_INPROG))
 727                 tsleep(&ccb->ccb_h.cbfcnp, PRIBIO, "cbwait", 0);
 728
 729         splx(s);
 730 }
 731
 732 int
 733 cam_periph_ioctl(struct cam_periph *periph, int cmd, caddr_t addr,
 734                  int (*error_routine)(union ccb *ccb,
 735                                       cam_flags camflags,
 736                                       u_int32_t sense_flags))
 737 {
 738         union ccb            *ccb;
 739         int                  error;
 740         int                  found;
 741
 742         error = found = 0;
 743
 744         switch(cmd){
 745         case CAMGETPASSTHRU:
 746                 ccb = cam_periph_getccb(periph, /* priority */ 1);
 747                 xpt_setup_ccb(&ccb->ccb_h,
 748                               ccb->ccb_h.path,
 749                               /*priority*/1);
 750                 ccb->ccb_h.func_code = XPT_GDEVLIST;
 751
 752                 /*
 753                  * Basically, the point of this is that we go through
 754                  * getting the list of devices, until we find a passthrough
 755                  * device.  In the current version of the CAM code, the
 756                  * only way to determine what type of device we're dealing
 757                  * with is by its name.
 758                  */
 759                 while (found == 0) {
 760                         ccb->cgdl.index = 0;
 761                         ccb->cgdl.status = CAM_GDEVLIST_MORE_DEVS;
 762                         while (ccb->cgdl.status == CAM_GDEVLIST_MORE_DEVS) {
 763
 764                                 /* we want the next device in the list */
 765                                 xpt_action(ccb);
 766                                 if (strncmp(ccb->cgdl.periph_name,
 767                                     "pass", 4) == 0){
 768                                         found = 1;
 769                                         break;
 770                                 }
 771                         }
 772                         if ((ccb->cgdl.status == CAM_GDEVLIST_LAST_DEVICE) &&
 773                             (found == 0)) {
 774                                 ccb->cgdl.periph_name[0] = '\0';
 775                                 ccb->cgdl.unit_number = 0;
 776                                 break;
 777                         }
 778                 }
 779
 780                 /* copy the result back out */
 781                 bcopy(ccb, addr, sizeof(union ccb));
 782
 783                 /* and release the ccb */
 784                 xpt_release_ccb(ccb);
 785
 786                 break;
 787         default:
 788                 error = ENOTTY;
 789                 break;
 790         }
 791         return(error);
 792 }
 793
 794 int
 795 cam_periph_runccb(union ccb *ccb,
 796                   int (*error_routine)(union ccb *ccb,
 797                                        cam_flags camflags,
 798                                        u_int32_t sense_flags),
 799                   cam_flags camflags, u_int32_t sense_flags,
 800                   struct devstat *ds)
 801 {
 802         int error;
 803
 804         error = 0;
 805
 806         /*
 807          * If the user has supplied a stats structure, and if we understand
 808          * this particular type of ccb, record the transaction start.
 809          */
 810         if ((ds != NULL) && (ccb->ccb_h.func_code == XPT_SCSI_IO))
 811                 devstat_start_transaction(ds);
 812
 813         xpt_action(ccb);
 814
 815         do {
 816                 cam_periph_ccbwait(ccb);
 817                 if ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP)
 818                         error = 0;
 819                 else if (error_routine != NULL)
 820                         error = (*error_routine)(ccb, camflags, sense_flags);
 821                 else
 822                         error = 0;
 823
 824         } while (error == ERESTART);
 825
 826         if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
 827                 cam_release_devq(ccb->ccb_h.path,
 828                                  /* relsim_flags */0,
 829                                  /* openings */0,
 830                                  /* timeout */0,
 831                                  /* getcount_only */ FALSE);
 832
 833         if ((ds != NULL) && (ccb->ccb_h.func_code == XPT_SCSI_IO))
 834                 devstat_end_transaction(ds,
 835                                         ccb->csio.dxfer_len,
 836                                         ccb->csio.tag_action & 0xf,
 837                                         ((ccb->ccb_h.flags & CAM_DIR_MASK) ==
 838                                         CAM_DIR_NONE) ?  DEVSTAT_NO_DATA :
 839                                         (ccb->ccb_h.flags & CAM_DIR_OUT) ?
 840                                         DEVSTAT_WRITE :
 841                                         DEVSTAT_READ);
 842
 843         return(error);
 844 }
 845
 846 void
 847 cam_freeze_devq(struct cam_path *path)
 848 {
 849         struct ccb_hdr ccb_h;
 850
 851         xpt_setup_ccb(&ccb_h, path, /*priority*/1);
 852         ccb_h.func_code = XPT_NOOP;
 853         ccb_h.flags = CAM_DEV_QFREEZE;
 854         xpt_action((union ccb *)&ccb_h);
 855 }
 856
 857 u_int32_t
 858 cam_release_devq(struct cam_path *path, u_int32_t relsim_flags,
 859                  u_int32_t openings, u_int32_t timeout,
 860                  int getcount_only)
 861 {
 862         struct ccb_relsim crs;
 863
 864         xpt_setup_ccb(&crs.ccb_h, path,
 865                       /*priority*/1);
 866         crs.ccb_h.func_code = XPT_REL_SIMQ;
 867         crs.ccb_h.flags = getcount_only ? CAM_DEV_QFREEZE : 0;
 868         crs.release_flags = relsim_flags;
 869         crs.openings = openings;
 870         crs.release_timeout = timeout;
 871         xpt_action((union ccb *)&crs);
 872         return (crs.qfrozen_cnt);
 873 }
 874
 875 #define saved_ccb_ptr ppriv_ptr0
 876 static void
 877 camperiphdone(struct cam_periph *periph, union ccb *done_ccb)
 878 {
 879         cam_status      status;
 880         int             frozen;
 881         int             sense;
 882         struct scsi_start_stop_unit *scsi_cmd;
 883         u_int32_t       relsim_flags, timeout;
 884         u_int32_t       qfrozen_cnt;
 885
 886         status = done_ccb->ccb_h.status;
 887         frozen = (status & CAM_DEV_QFRZN) != 0;
 888         sense  = (status & CAM_AUTOSNS_VALID) != 0;
 889         status &= CAM_STATUS_MASK;
 890
 891         timeout = 0;
 892         relsim_flags = 0;
 893
 894         /*
 895          * Unfreeze the queue once if it is already frozen..
 896          */
 897         if (frozen != 0) {
 898                 qfrozen_cnt = cam_release_devq(done_ccb->ccb_h.path,
 899                                               /*relsim_flags*/0,
 900                                               /*openings*/0,
 901                                               /*timeout*/0,
 902                                               /*getcount_only*/0);
 903         }
 904
 905         switch (status) {
 906
 907         case CAM_REQ_CMP:
 908
 909                 /*
 910                  * If we have successfully taken a device from the not
 911                  * ready to ready state, re-scan the device and re-get the
 912                  * inquiry information.  Many devices (mostly disks) don't
 913                  * properly report their inquiry information unless they
 914                  * are spun up.
 915                  */
 916                 if (done_ccb->ccb_h.func_code == XPT_SCSI_IO) {
 917                         scsi_cmd = (struct scsi_start_stop_unit *)
 918                                         &done_ccb->csio.cdb_io.cdb_bytes;
 919
 920                         if (scsi_cmd->opcode == START_STOP_UNIT)
 921                                 xpt_async(AC_INQ_CHANGED,
 922                                           done_ccb->ccb_h.path, NULL);
 923                 }
 924                 bcopy(done_ccb->ccb_h.saved_ccb_ptr, done_ccb,
 925                       sizeof(union ccb));
 926
 927                 periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG;
 928
 929                 xpt_action(done_ccb);
 930
 931                 break;
 932         case CAM_SCSI_STATUS_ERROR:
 933                 scsi_cmd = (struct scsi_start_stop_unit *)
 934                                 &done_ccb->csio.cdb_io.cdb_bytes;
 935                 if (sense != 0) {
 936                         struct scsi_sense_data *sense;
 937                         int    error_code, sense_key, asc, ascq;
 938
 939                         sense = &done_ccb->csio.sense_data;
 940                         scsi_extract_sense(sense, &error_code,
 941                                            &sense_key, &asc, &ascq);
 942
 943                         /*
 944                          * If the error is "invalid field in CDB",
 945                          * and the load/eject flag is set, turn the
 946                          * flag off and try again.  This is just in
 947                          * case the drive in question barfs on the
 948                          * load eject flag.  The CAM code should set
 949                          * the load/eject flag by default for
 950                          * removable media.
 951                          */
 952
 953                         /* XXX KDM
 954                          * Should we check to see what the specific
 955                          * scsi status is??  Or does it not matter
 956                          * since we already know that there was an
 957                          * error, and we know what the specific
 958                          * error code was, and we know what the
 959                          * opcode is..
 960                          */
 961                         if ((scsi_cmd->opcode == START_STOP_UNIT) &&
 962                             ((scsi_cmd->how & SSS_LOEJ) != 0) &&
 963                              (asc == 0x24) && (ascq == 0x00) &&
 964                              (done_ccb->ccb_h.retry_count > 0)) {
 965
 966                                 scsi_cmd->how &= ~SSS_LOEJ;
 967
 968                                 xpt_action(done_ccb);
 969
 970                         } else if (done_ccb->ccb_h.retry_count > 0) {
 971                                 /*
 972                                  * In this case, the error recovery
 973                                  * command failed, but we've got
 974                                  * some retries left on it.  Give
 975                                  * it another try.
 976                                  */
 977
 978                                 /* set the timeout to .5 sec */
 979                                 relsim_flags =
 980                                         RELSIM_RELEASE_AFTER_TIMEOUT;
 981                                 timeout = 500;
 982
 983                                 xpt_action(done_ccb);
 984
 985                                 break;
 986
 987                         } else {
 988                                 /*
 989                                  * Copy the original CCB back and
 990                                  * send it back to the caller.
 991                                  */
 992                                 bcopy(done_ccb->ccb_h.saved_ccb_ptr,
 993                                       done_ccb, sizeof(union ccb));
 994
 995                                 periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG;
 996
 997                                 xpt_action(done_ccb);
 998                         }
 999                 } else {
1000                         /*
1001                          * Eh??  The command failed, but we don't
1002                          * have any sense.  What's up with that?
1003                          * Fire the CCB again to return it to the
1004                          * caller.
1005                          */
1006                         bcopy(done_ccb->ccb_h.saved_ccb_ptr,
1007                               done_ccb, sizeof(union ccb));
1008
1009                         periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG;
1010
1011                         xpt_action(done_ccb);
1012
1013                 }
1014                 break;
1015         default:
1016                 bcopy(done_ccb->ccb_h.saved_ccb_ptr, done_ccb,
1017                       sizeof(union ccb));
1018
1019                 periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG;
1020
1021                 xpt_action(done_ccb);
1022
1023                 break;
1024         }
1025
1026         /* decrement the retry count */
1027         if (done_ccb->ccb_h.retry_count > 0)
1028                 done_ccb->ccb_h.retry_count--;
1029
1030         qfrozen_cnt = cam_release_devq(done_ccb->ccb_h.path,
1031                                       /*relsim_flags*/relsim_flags,
1032                                       /*openings*/0,
1033                                       /*timeout*/timeout,
1034                                       /*getcount_only*/0);
1035 }
1036
1037 /*
1038  * Generic Async Event handler.  Peripheral drivers usually
1039  * filter out the events that require personal attention,
1040  * and leave the rest to this function.
1041  */
1042 void
1043 cam_periph_async(struct cam_periph *periph, u_int32_t code,
1044                  struct cam_path *path, void *arg)
1045 {
1046         switch (code) {
1047         case AC_LOST_DEVICE:
1048                 cam_periph_invalidate(periph);
1049                 break;
1050         case AC_SENT_BDR:
1051         case AC_BUS_RESET:
1052         {
1053                 cam_periph_bus_settle(periph, SCSI_DELAY);
1054                 break;
1055         }
1056         default:
1057                 break;
1058         }
1059 }
1060
1061 void
1062 cam_periph_bus_settle(struct cam_periph *periph, u_int bus_settle)
1063 {
1064         struct ccb_getdevstats cgds;
1065
1066         xpt_setup_ccb(&cgds.ccb_h, periph->path, /*priority*/1);
1067         cgds.ccb_h.func_code = XPT_GDEV_STATS;
1068         xpt_action((union ccb *)&cgds);
1069         cam_periph_freeze_after_event(periph, &cgds.last_reset, bus_settle);
1070 }
1071
1072 void
1073 cam_periph_freeze_after_event(struct cam_periph *periph,
1074                               struct timeval* event_time, u_int duration_ms)
1075 {
1076         struct timeval delta;
1077         struct timeval duration_tv;
1078         int s;
1079
1080         s = splclock();
1081         microtime(&delta);
1082         splx(s);
1083         timevalsub(&delta, event_time);
1084         duration_tv.tv_sec = duration_ms / 1000;
1085         duration_tv.tv_usec = (duration_ms % 1000) * 1000;
1086         if (timevalcmp(&delta, &duration_tv, <)) {
1087                 timevalsub(&duration_tv, &delta);
1088
1089                 duration_ms = duration_tv.tv_sec * 1000;
1090                 duration_ms += duration_tv.tv_usec / 1000;
1091                 cam_freeze_devq(periph->path);
1092                 cam_release_devq(periph->path,
1093                                 RELSIM_RELEASE_AFTER_TIMEOUT,
1094                                 /*reduction*/0,
1095                                 /*timeout*/duration_ms,
1096                                 /*getcount_only*/0);
1097         }
1098
1099 }
1100
1101 /*
1102  * Generic error handler.  Peripheral drivers usually filter
1103  * out the errors that they handle in a unique mannor, then
1104  * call this function.
1105  */
1106 int
1107 cam_periph_error(union ccb *ccb, cam_flags camflags,
1108                  u_int32_t sense_flags, union ccb *save_ccb)
1109 {
1110         cam_status status;
1111         int        frozen;
1112         int        sense;
1113         int        error;
1114         int        openings;
1115         int        retry;
1116         u_int32_t  relsim_flags;
1117         u_int32_t  timeout;
1118
1119         status = ccb->ccb_h.status;
1120         frozen = (status & CAM_DEV_QFRZN) != 0;
1121         sense  = (status & CAM_AUTOSNS_VALID) != 0;
1122         status &= CAM_STATUS_MASK;
1123         relsim_flags = 0;
1124
1125         switch (status) {
1126         case CAM_REQ_CMP:
1127                 /* decrement the number of retries */
1128                 retry = ccb->ccb_h.retry_count > 0;
1129                 if (retry)
1130                         ccb->ccb_h.retry_count--;
1131                 error = 0;
1132                 break;
1133         case CAM_AUTOSENSE_FAIL:
1134         case CAM_SCSI_STATUS_ERROR:
1135
1136                 switch (ccb->csio.scsi_status) {
1137                 case SCSI_STATUS_OK:
1138                 case SCSI_STATUS_COND_MET:
1139                 case SCSI_STATUS_INTERMED:
1140                 case SCSI_STATUS_INTERMED_COND_MET:
1141                         error = 0;
1142                         break;
1143                 case SCSI_STATUS_CMD_TERMINATED:
1144                 case SCSI_STATUS_CHECK_COND:
1145                         if (sense != 0) {
1146                                 struct scsi_sense_data *sense;
1147                                 int    error_code, sense_key, asc, ascq;
1148                                 struct cam_periph *periph;
1149                                 scsi_sense_action err_action;
1150                                 struct ccb_getdev cgd;
1151
1152                                 sense = &ccb->csio.sense_data;
1153                                 scsi_extract_sense(sense, &error_code,
1154                                                    &sense_key, &asc, &ascq);
1155                                 periph = xpt_path_periph(ccb->ccb_h.path);
1156
1157                                 /*
1158                                  * Grab the inquiry data for this device.
1159                                  */
1160                                 xpt_setup_ccb(&cgd.ccb_h, ccb->ccb_h.path,
1161                                               /*priority*/ 1);
1162                                 cgd.ccb_h.func_code = XPT_GDEV_TYPE;
1163                                 xpt_action((union ccb *)&cgd);
1164
1165                                 err_action = scsi_error_action(asc, ascq,
1166                                                                &cgd.inq_data);
1167
1168                                 /*
1169                                  * Send a Test Unit Ready to the device.
1170                                  * If the 'many' flag is set, we send 120
1171                                  * test unit ready commands, one every half
1172                                  * second.  Otherwise, we just send one TUR.
1173                                  * We only want to do this if the retry
1174                                  * count has not been exhausted.
1175                                  */
1176                                 if (((err_action & SS_MASK) == SS_TUR)
1177                                  && save_ccb != NULL
1178                                  && ccb->ccb_h.retry_count > 0) {
1179
1180                                         /*
1181                                          * Since error recovery is already
1182                                          * in progress, don't attempt to
1183                                          * process this error.  It is probably
1184                                          * related to the error that caused
1185                                          * the currently active error recovery
1186                                          * action.  Also, we only have
1187                                          * space for one saved CCB, so if we
1188                                          * had two concurrent error recovery
1189                                          * actions, we would end up
1190                                          * over-writing one error recovery
1191                                          * CCB with another one.
1192                                          */
1193                                         if (periph->flags &
1194                                             CAM_PERIPH_RECOVERY_INPROG) {
1195                                                 error = ERESTART;
1196                                                 break;
1197                                         }
1198
1199                                         periph->flags |=
1200                                                 CAM_PERIPH_RECOVERY_INPROG;
1201
1202                                         /* decrement the number of retries */
1203                                         if ((err_action &
1204                                              SSQ_DECREMENT_COUNT) != 0) {
1205                                                 retry = 1;
1206                                                 ccb->ccb_h.retry_count--;
1207                                         }
1208
1209                                         bcopy(ccb, save_ccb, sizeof(*save_ccb));
1210
1211                                         /*
1212                                          * We retry this one every half
1213                                          * second for a minute.  If the
1214                                          * device hasn't become ready in a
1215                                          * minute's time, it's unlikely to
1216                                          * ever become ready.  If the table
1217                                          * doesn't specify SSQ_MANY, we can
1218                                          * only try this once.  Oh well.
1219                                          */
1220                                         if ((err_action & SSQ_MANY) != 0)
1221                                                 scsi_test_unit_ready(&ccb->csio,
1222                                                                /*retries*/120,
1223                                                                camperiphdone,
1224                                                                MSG_SIMPLE_Q_TAG,
1225                                                                SSD_FULL_SIZE,
1226                                                                /*timeout*/5000);
1227                                         else
1228                                                 scsi_test_unit_ready(&ccb->csio,
1229                                                                /*retries*/1,
1230                                                                camperiphdone,
1231                                                                MSG_SIMPLE_Q_TAG,
1232                                                                SSD_FULL_SIZE,
1233                                                                /*timeout*/5000);
1234
1235                                         /* release the queue after .5 sec.  */
1236                                         relsim_flags =
1237                                                 RELSIM_RELEASE_AFTER_TIMEOUT;
1238                                         timeout = 500;
1239                                         /*
1240                                          * Drop the priority to 0 so that
1241                                          * we are the first to execute.  Also
1242                                          * freeze the queue after this command
1243                                          * is sent so that we can restore the
1244                                          * old csio and have it queued in the
1245                                          * proper order before we let normal
1246                                          * transactions go to the drive.
1247                                          */
1248                                         ccb->ccb_h.pinfo.priority = 0;
1249                                         ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
1250
1251                                         /*
1252                                          * Save a pointer to the original
1253                                          * CCB in the new CCB.
1254                                          */
1255                                         ccb->ccb_h.saved_ccb_ptr = save_ccb;
1256
1257                                         error = ERESTART;
1258                                 }
1259                                 /*
1260                                  * Send a start unit command to the device,
1261                                  * and then retry the command.  We only
1262                                  * want to do this if the retry count has
1263                                  * not been exhausted.  If the user
1264                                  * specified 0 retries, then we follow
1265                                  * their request and do not retry.
1266                                  */
1267                                 else if (((err_action & SS_MASK) == SS_START)
1268                                       && save_ccb != NULL
1269                                       && ccb->ccb_h.retry_count > 0) {
1270                                         int le;
1271
1272                                         /*
1273                                          * Only one error recovery action
1274                                          * at a time.  See above.
1275                                          */
1276                                         if (periph->flags &
1277                                             CAM_PERIPH_RECOVERY_INPROG) {
1278                                                 error = ERESTART;
1279                                                 break;
1280                                         }
1281
1282                                         periph->flags |=
1283                                                 CAM_PERIPH_RECOVERY_INPROG;
1284
1285                                         /* decrement the number of retries */
1286                                         retry = 1;
1287                                         ccb->ccb_h.retry_count--;
1288
1289                                         /*
1290                                          * Check for removable media and
1291                                          * set load/eject flag
1292                                          * appropriately.
1293                                          */
1294                                         if (SID_IS_REMOVABLE(&cgd.inq_data))
1295                                                 le = TRUE;
1296                                         else
1297                                                 le = FALSE;
1298
1299                                         /*
1300                                          * Attempt to start the drive up.
1301                                          *
1302                                          * Save the current ccb so it can
1303                                          * be restored and retried once the
1304                                          * drive is started up.
1305                                          */
1306                                         bcopy(ccb, save_ccb, sizeof(*save_ccb));
1307
1308                                         scsi_start_stop(&ccb->csio,
1309                                                         /*retries*/1,
1310                                                         camperiphdone,
1311                                                         MSG_SIMPLE_Q_TAG,
1312                                                         /*start*/TRUE,
1313                                                         /*load/eject*/le,
1314                                                         /*immediate*/FALSE,
1315                                                         SSD_FULL_SIZE,
1316                                                         /*timeout*/50000);
1317                                         /*
1318                                          * Drop the priority to 0 so that
1319                                          * we are the first to execute.  Also
1320                                          * freeze the queue after this command
1321                                          * is sent so that we can restore the
1322                                          * old csio and have it queued in the
1323                                          * proper order before we let normal
1324                                          * transactions go to the drive.
1325                                          */
1326                                         ccb->ccb_h.pinfo.priority = 0;
1327                                         ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
1328
1329                                         /*
1330                                          * Save a pointer to the original
1331                                          * CCB in the new CCB.
1332                                          */
1333                                         ccb->ccb_h.saved_ccb_ptr = save_ccb;
1334
1335                                         error = ERESTART;
1336                                 } else if ((sense_flags & SF_RETRY_UA) != 0) {
1337                                         /*
1338                                          * XXX KDM this is a *horrible*
1339                                          * hack.
1340                                          */
1341                                         error = scsi_interpret_sense(ccb,
1342                                                                   sense_flags,
1343                                                                   &relsim_flags,
1344                                                                   &openings,
1345                                                                   &timeout,
1346                                                                   err_action);
1347                                 }
1348
1349                                 /*
1350                                  * Theoretically, this code should send a
1351                                  * test unit ready to the given device, and
1352                                  * if it returns and error, send a start
1353                                  * unit command.  Since we don't yet have
1354                                  * the capability to do two-command error
1355                                  * recovery, just send a start unit.
1356                                  * XXX KDM fix this!
1357                                  */
1358                                 else if (((err_action & SS_MASK) == SS_TURSTART)
1359                                       && save_ccb != NULL
1360                                       && ccb->ccb_h.retry_count > 0) {
1361                                         int le;
1362
1363                                         /*
1364                                          * Only one error recovery action
1365                                          * at a time.  See above.
1366                                          */
1367                                         if (periph->flags &
1368                                             CAM_PERIPH_RECOVERY_INPROG) {
1369                                                 error = ERESTART;
1370                                                 break;
1371                                         }
1372
1373                                         periph->flags |=
1374                                                 CAM_PERIPH_RECOVERY_INPROG;
1375
1376                                         /* decrement the number of retries */
1377                                         retry = 1;
1378                                         ccb->ccb_h.retry_count--;
1379
1380                                         /*
1381                                          * Check for removable media and
1382                                          * set load/eject flag
1383                                          * appropriately.
1384                                          */
1385                                         if (SID_IS_REMOVABLE(&cgd.inq_data))
1386                                                 le = TRUE;
1387                                         else
1388                                                 le = FALSE;
1389
1390                                         /*
1391                                          * Attempt to start the drive up.
1392                                          *
1393                                          * Save the current ccb so it can
1394                                          * be restored and retried once the
1395                                          * drive is started up.
1396                                          */
1397                                         bcopy(ccb, save_ccb, sizeof(*save_ccb));
1398
1399                                         scsi_start_stop(&ccb->csio,
1400                                                         /*retries*/1,
1401                                                         camperiphdone,
1402                                                         MSG_SIMPLE_Q_TAG,
1403                                                         /*start*/TRUE,
1404                                                         /*load/eject*/le,
1405                                                         /*immediate*/FALSE,
1406                                                         SSD_FULL_SIZE,
1407                                                         /*timeout*/50000);
1408
1409                                         /* release the queue after .5 sec.  */
1410                                         relsim_flags =
1411                                                 RELSIM_RELEASE_AFTER_TIMEOUT;
1412                                         timeout = 500;
1413                                         /*
1414                                          * Drop the priority to 0 so that
1415                                          * we are the first to execute.  Also
1416                                          * freeze the queue after this command
1417                                          * is sent so that we can restore the
1418                                          * old csio and have it queued in the
1419                                          * proper order before we let normal
1420                                          * transactions go to the drive.
1421                                          */
1422                                         ccb->ccb_h.pinfo.priority = 0;
1423                                         ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
1424
1425                                         /*
1426                                          * Save a pointer to the original
1427                                          * CCB in the new CCB.
1428                                          */
1429                                         ccb->ccb_h.saved_ccb_ptr = save_ccb;
1430
1431                                         error = ERESTART;
1432                                 } else {
1433                                         error = scsi_interpret_sense(ccb,
1434                                                                   sense_flags,
1435                                                                   &relsim_flags,
1436                                                                   &openings,
1437                                                                   &timeout,
1438                                                                   err_action);
1439                                 }
1440                         } else if (ccb->csio.scsi_status ==
1441                                    SCSI_STATUS_CHECK_COND
1442                                 && status != CAM_AUTOSENSE_FAIL) {
1443                                 /* no point in decrementing the retry count */
1444                                 panic("cam_periph_error: scsi status of "
1445                                       "CHECK COND returned but no sense "
1446                                       "information is availible.  "
1447                                       "Controller should have returned "
1448                                       "CAM_AUTOSENSE_FAILED");
1449                                 /* NOTREACHED */
1450                                 error = EIO;
1451                         } else if (ccb->ccb_h.retry_count == 0) {
1452                                 /*
1453                                  * XXX KDM shouldn't there be a better
1454                                  * argument to return??
1455                                  */
1456                                 error = EIO;
1457                         } else {
1458                                 /* decrement the number of retries */
1459                                 retry = ccb->ccb_h.retry_count > 0;
1460                                 if (retry)
1461                                         ccb->ccb_h.retry_count--;
1462                                 /*
1463                                  * If it was aborted with no
1464                                  * clue as to the reason, just
1465                                  * retry it again.
1466                                  */
1467                                 error = ERESTART;
1468                         }
1469                         break;
1470                 case SCSI_STATUS_QUEUE_FULL:
1471                 {
1472                         /* no decrement */
1473                         struct ccb_getdevstats cgds;
1474
1475                         /*
1476                          * First off, find out what the current
1477                          * transaction counts are.
1478                          */
1479                         xpt_setup_ccb(&cgds.ccb_h,
1480                                       ccb->ccb_h.path,
1481                                       /*priority*/1);
1482                         cgds.ccb_h.func_code = XPT_GDEV_STATS;
1483                         xpt_action((union ccb *)&cgds);
1484
1485                         /*
1486                          * If we were the only transaction active, treat
1487                          * the QUEUE FULL as if it were a BUSY condition.
1488                          */
1489                         if (cgds.dev_active != 0) {
1490                                 int total_openings;
1491
1492                                 /*
1493                                  * Reduce the number of openings to
1494                                  * be 1 less than the amount it took
1495                                  * to get a queue full bounded by the
1496                                  * minimum allowed tag count for this
1497                                  * device.
1498                                  */
1499                                 total_openings =
1500                                     cgds.dev_active+cgds.dev_openings;
1501                                 openings = cgds.dev_active;
1502                                 if (openings < cgds.mintags)
1503                                         openings = cgds.mintags;
1504                                 if (openings < total_openings)
1505                                         relsim_flags = RELSIM_ADJUST_OPENINGS;
1506                                 else {
1507                                         /*
1508                                          * Some devices report queue full for
1509                                          * temporary resource shortages.  For
1510                                          * this reason, we allow a minimum
1511                                          * tag count to be entered via a
1512                                          * quirk entry to prevent the queue
1513                                          * count on these devices from falling
1514                                          * to a pessimisticly low value.  We
1515                                          * still wait for the next successful
1516                                          * completion, however, before queueing
1517                                          * more transactions to the device.
1518                                          */
1519                                         relsim_flags =
1520                                             RELSIM_RELEASE_AFTER_CMDCMPLT;
1521                                 }
1522                                 timeout = 0;
1523                                 error = ERESTART;
1524                                 break;
1525                         }
1526                         /* FALLTHROUGH */
1527                 }
1528                 case SCSI_STATUS_BUSY:
1529                         /*
1530                          * Restart the queue after either another
1531                          * command completes or a 1 second timeout.
1532                          * If we have any retries left, that is.
1533                          */
1534                         retry = ccb->ccb_h.retry_count > 0;
1535                         if (retry) {
1536                                 ccb->ccb_h.retry_count--;
1537                                 error = ERESTART;
1538                                 relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT
1539                                              | RELSIM_RELEASE_AFTER_CMDCMPLT;
1540                                 timeout = 1000;
1541                         } else {
1542                                 error = EIO;
1543                         }
1544                         break;
1545                 case SCSI_STATUS_RESERV_CONFLICT:
1546                         error = EIO;
1547                         break;
1548                 default:
1549                         error = EIO;
1550                         break;
1551                 }
1552                 break;
1553         case CAM_REQ_CMP_ERR:
1554         case CAM_CMD_TIMEOUT:
1555         case CAM_UNEXP_BUSFREE:
1556         case CAM_UNCOR_PARITY:
1557         case CAM_DATA_RUN_ERR:
1558                 /* decrement the number of retries */
1559                 retry = ccb->ccb_h.retry_count > 0;
1560                 if (retry) {
1561                         ccb->ccb_h.retry_count--;
1562                         error = ERESTART;
1563                 } else {
1564                         error = EIO;
1565                 }
1566                 break;
1567         case CAM_UA_ABORT:
1568         case CAM_UA_TERMIO:
1569         case CAM_MSG_REJECT_REC:
1570                 /* XXX Don't know that these are correct */
1571                 error = EIO;
1572                 break;
1573         case CAM_SEL_TIMEOUT:
1574         {
1575                 /*
1576                  * XXX
1577                  * A single selection timeout should not be enough
1578                  * to invalidate a device.  We should retry for multiple
1579                  * seconds assuming this isn't a probe.  We'll probably
1580                  * need a special flag for that.
1581                  */
1582 #if 0
1583                 struct cam_path *newpath;
1584
1585                 /* Should we do more if we can't create the path?? */
1586                 if (xpt_create_path(&newpath, xpt_path_periph(ccb->ccb_h.path),
1587                                     xpt_path_path_id(ccb->ccb_h.path),
1588                                     xpt_path_target_id(ccb->ccb_h.path),
1589                                     CAM_LUN_WILDCARD) != CAM_REQ_CMP)
1590                         break;
1591                 /*
1592                  * Let peripheral drivers know that this device has gone
1593                  * away.
1594                  */
1595                 xpt_async(AC_LOST_DEVICE, newpath, NULL);
1596                 xpt_free_path(newpath);
1597 #endif
1598                 if ((sense_flags & SF_RETRY_SELTO) != 0) {
1599                         retry = ccb->ccb_h.retry_count > 0;
1600                         if (retry) {
1601                                 ccb->ccb_h.retry_count--;
1602                                 error = ERESTART;
1603                                 /*
1604                                  * Wait half a second to give the device
1605                                  * time to recover before we try again.
1606                                  */
1607                                 relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
1608                                 timeout = 500;
1609                         } else {
1610                                 error = ENXIO;
1611                         }
1612                 } else {
1613                         error = ENXIO;
1614                 }
1615                 break;
1616         }
1617         case CAM_REQ_INVALID:
1618         case CAM_PATH_INVALID:
1619         case CAM_DEV_NOT_THERE:
1620         case CAM_NO_HBA:
1621         case CAM_PROVIDE_FAIL:
1622         case CAM_REQ_TOO_BIG:
1623                 error = EINVAL;
1624                 break;
1625         case CAM_SCSI_BUS_RESET:
1626         case CAM_BDR_SENT:
1627         case CAM_REQUEUE_REQ:
1628                 /* Unconditional requeue, dammit */
1629                 error = ERESTART;
1630                 break;
1631         case CAM_RESRC_UNAVAIL:
1632         case CAM_BUSY:
1633                 /* timeout??? */
1634         default:
1635                 /* decrement the number of retries */
1636                 retry = ccb->ccb_h.retry_count > 0;
1637                 if (retry) {
1638                         ccb->ccb_h.retry_count--;
1639                         error = ERESTART;
1640                 } else {
1641                         /* Check the sense codes */
1642                         error = EIO;
1643                 }
1644                 break;
1645         }
1646
1647         /* Attempt a retry */
1648         if (error == ERESTART || error == 0) {
1649                 if (frozen != 0)
1650                         ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
1651
1652                 if (error == ERESTART)
1653                         xpt_action(ccb);
1654
1655                 if (frozen != 0) {
1656                         cam_release_devq(ccb->ccb_h.path,
1657                                          relsim_flags,
1658                                          openings,
1659                                          timeout,
1660                                          /*getcount_only*/0);
1661                 }
1662         }
1663
1664
1665         return (error);
1666 }