sys/cam/scsi/scsi_target.c

   1 /*-
   2  * Generic SCSI Target Kernel Mode Driver
   3  *
   4  * Copyright (c) 2002 Nate Lawson.
   5  * Copyright (c) 1998, 1999, 2001, 2002 Justin T. Gibbs.
   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
  34 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <sys/kernel.h>
  37 #include <sys/conf.h>
  38 #include <sys/malloc.h>
  39 #include <sys/poll.h>
  40 #include <sys/vnode.h>
  41 #include <sys/lock.h>
  42 #include <sys/mutex.h>
  43 #include <sys/devicestat.h>
  44 #include <sys/proc.h>
  45 /* Includes to support callout */
  46 #include <sys/types.h>
  47 #include <sys/systm.h>
  48
  49 #include <cam/cam.h>
  50 #include <cam/cam_ccb.h>
  51 #include <cam/cam_periph.h>
  52 #include <cam/cam_xpt_periph.h>
  53 #include <cam/cam_sim.h>
  54 #include <cam/scsi/scsi_targetio.h>
  55
  56
  57 /* Transaction information attached to each CCB sent by the user */
  58 struct targ_cmd_descr {
  59         struct cam_periph_map_info  mapinfo;
  60         TAILQ_ENTRY(targ_cmd_descr) tqe;
  61         union ccb *user_ccb;
  62         int        priority;
  63         int        func_code;
  64 };
  65
  66 /* Offset into the private CCB area for storing our descriptor */
  67 #define targ_descr      periph_priv.entries[1].ptr
  68
  69 TAILQ_HEAD(descr_queue, targ_cmd_descr);
  70
  71 typedef enum {
  72         TARG_STATE_RESV         = 0x00, /* Invalid state */
  73         TARG_STATE_OPENED       = 0x01, /* Device opened, softc initialized */
  74         TARG_STATE_LUN_ENABLED  = 0x02  /* Device enabled for a path */
  75 } targ_state;
  76
  77 /* Per-instance device software context */
  78 struct targ_softc {
  79         /* CCBs (CTIOs, ATIOs, INOTs) pending on the controller */
  80         struct ccb_queue         pending_ccb_queue;
  81
  82         /* Command descriptors awaiting CTIO resources from the XPT */
  83         struct descr_queue       work_queue;
  84
  85         /* Command descriptors that have been aborted back to the user. */
  86         struct descr_queue       abort_queue;
  87
  88         /*
  89          * Queue of CCBs that have been copied out to userland, but our
  90          * userland daemon has not yet seen.
  91          */
  92         struct ccb_queue         user_ccb_queue;
  93
  94         struct cam_periph       *periph;
  95         struct cam_path         *path;
  96         targ_state               state;
  97         struct selinfo           read_select;
  98         struct devstat           device_stats;
  99         struct callout          destroy_dev_callout;
 100         struct mtx              destroy_mtx;
 101 };
 102
 103 static d_open_t         targopen;
 104 static d_close_t        targclose;
 105 static d_read_t         targread;
 106 static d_write_t        targwrite;
 107 static d_ioctl_t        targioctl;
 108 static d_poll_t         targpoll;
 109 static d_kqfilter_t     targkqfilter;
 110 static void             targreadfiltdetach(struct knote *kn);
 111 static int              targreadfilt(struct knote *kn, long hint);
 112 static struct filterops targread_filtops = {
 113         .f_isfd = 1,
 114         .f_detach = targreadfiltdetach,
 115         .f_event = targreadfilt,
 116 };
 117
 118 static struct cdevsw targ_cdevsw = {
 119         .d_version =    D_VERSION,
 120         .d_flags =      D_NEEDGIANT,
 121         .d_open =       targopen,
 122         .d_close =      targclose,
 123         .d_read =       targread,
 124         .d_write =      targwrite,
 125         .d_ioctl =      targioctl,
 126         .d_poll =       targpoll,
 127         .d_name =       "targ",
 128         .d_kqfilter =   targkqfilter
 129 };
 130
 131 static cam_status       targendislun(struct cam_path *path, int enable,
 132                                      int grp6_len, int grp7_len);
 133 static cam_status       targenable(struct targ_softc *softc,
 134                                    struct cam_path *path,
 135                                    int grp6_len, int grp7_len);
 136 static cam_status       targdisable(struct targ_softc *softc);
 137 static periph_ctor_t    targctor;
 138 static periph_dtor_t    targdtor;
 139 static periph_start_t   targstart;
 140 static int              targusermerge(struct targ_softc *softc,
 141                                       struct targ_cmd_descr *descr,
 142                                       union ccb *ccb);
 143 static int              targsendccb(struct targ_softc *softc, union ccb *ccb,
 144                                     struct targ_cmd_descr *descr);
 145 static void             targdone(struct cam_periph *periph,
 146                                  union  ccb *done_ccb);
 147 static int              targreturnccb(struct targ_softc *softc,
 148                                       union  ccb *ccb);
 149 static union ccb *      targgetccb(struct targ_softc *softc, xpt_opcode type,
 150                                    int priority);
 151 static void             targfreeccb(struct targ_softc *softc, union ccb *ccb);
 152 static struct targ_cmd_descr *
 153                         targgetdescr(struct targ_softc *softc);
 154 static periph_init_t    targinit;
 155 static void             targclone(void *arg, struct ucred *cred, char *name,
 156                                   int namelen, struct cdev **dev);
 157 static void             targasync(void *callback_arg, u_int32_t code,
 158                                   struct cam_path *path, void *arg);
 159 static void             abort_all_pending(struct targ_softc *softc);
 160 static void             notify_user(struct targ_softc *softc);
 161 static int              targcamstatus(cam_status status);
 162 static size_t           targccblen(xpt_opcode func_code);
 163 static void             targdestroy(void *);
 164
 165 static struct periph_driver targdriver =
 166 {
 167         targinit, "targ",
 168         TAILQ_HEAD_INITIALIZER(targdriver.units), /* generation */ 0
 169 };
 170 PERIPHDRIVER_DECLARE(targ, targdriver);
 171
 172 static MALLOC_DEFINE(M_TARG, "TARG", "TARG data");
 173
 174 /*
 175  * Create softc and initialize it. Only one proc can open each targ device.
 176  * There is no locking here because a periph doesn't get created until an
 177  * ioctl is issued to do so, and that can't happen until this method returns.
 178  */
 179 static int
 180 targopen(struct cdev *dev, int flags, int fmt, struct thread *td)
 181 {
 182         struct targ_softc *softc;
 183
 184         if (dev->si_drv1 != 0) {
 185                 return (EBUSY);
 186         }
 187
 188         /* Mark device busy before any potentially blocking operations */
 189         dev->si_drv1 = (void *)~0;
 190
 191         /* Create the targ device, allocate its softc, initialize it */
 192         if ((dev->si_flags & SI_NAMED) == 0) {
 193                 make_dev(&targ_cdevsw, dev2unit(dev), UID_ROOT, GID_WHEEL, 0600,
 194                          "targ%d", dev2unit(dev));
 195         }
 196         softc = malloc(sizeof(*softc), M_TARG,
 197                M_WAITOK | M_ZERO);
 198         dev->si_drv1 = softc;
 199         softc->state = TARG_STATE_OPENED;
 200         softc->periph = NULL;
 201         softc->path = NULL;
 202
 203         TAILQ_INIT(&softc->pending_ccb_queue);
 204         TAILQ_INIT(&softc->work_queue);
 205         TAILQ_INIT(&softc->abort_queue);
 206         TAILQ_INIT(&softc->user_ccb_queue);
 207         knlist_init_mtx(&softc->read_select.si_note, NULL);
 208
 209         return (0);
 210 }
 211
 212 /* Disable LUN if enabled and teardown softc */
 213 static int
 214 targclose(struct cdev *dev, int flag, int fmt, struct thread *td)
 215 {
 216         struct targ_softc     *softc;
 217         struct cam_periph     *periph;
 218         int    error;
 219
 220         softc = (struct targ_softc *)dev->si_drv1;
 221         mtx_init(&softc->destroy_mtx, "targ_destroy", "SCSI Target dev destroy", MTX_DEF);
 222         callout_init_mtx(&softc->destroy_dev_callout, &softc->destroy_mtx, CALLOUT_RETURNUNLOCKED);
 223         if (softc->periph == NULL) {
 224 #if 0
 225                 destroy_dev(dev);
 226                 free(softc, M_TARG);
 227 #endif
 228                 printf("%s: destroying non-enabled target\n", __func__);
 229                 mtx_lock(&softc->destroy_mtx);
 230                 callout_reset(&softc->destroy_dev_callout, hz / 2,
 231                         (void *)targdestroy, (void *)dev);
 232                 mtx_unlock(&softc->destroy_mtx);
 233                 return (0);
 234         }
 235
 236         /*
 237          * Acquire a hold on the periph so that it doesn't go away before
 238          * we are ready at the end of the function.
 239          */
 240         periph = softc->periph;
 241         cam_periph_acquire(periph);
 242         cam_periph_lock(periph);
 243         error = targdisable(softc);
 244         if (softc->periph != NULL) {
 245                 cam_periph_invalidate(softc->periph);
 246                 softc->periph = NULL;
 247         }
 248         cam_periph_unlock(periph);
 249         cam_periph_release(periph);
 250
 251 #if 0
 252         destroy_dev(dev);
 253         free(softc, M_TARG);
 254 #endif
 255
 256         printf("%s: close finished error(%d)\n", __func__, error);
 257         mtx_lock(&softc->destroy_mtx);
 258         callout_reset(&softc->destroy_dev_callout, hz / 2,
 259                 (void *)targdestroy, (void *)dev);
 260         mtx_unlock(&softc->destroy_mtx);
 261         return (error);
 262 }
 263
 264 /* Enable/disable LUNs, set debugging level */
 265 static int
 266 targioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
 267 {
 268         struct targ_softc *softc;
 269         cam_status         status;
 270
 271         softc = (struct targ_softc *)dev->si_drv1;
 272
 273         switch (cmd) {
 274         case TARGIOCENABLE:
 275         {
 276                 struct ioc_enable_lun   *new_lun;
 277                 struct cam_path         *path;
 278                 struct cam_sim          *sim;
 279
 280                 new_lun = (struct ioc_enable_lun *)addr;
 281                 status = xpt_create_path_unlocked(&path, /*periph*/NULL,
 282                                                   new_lun->path_id,
 283                                                   new_lun->target_id,
 284                                                   new_lun->lun_id);
 285                 if (status != CAM_REQ_CMP) {
 286                         printf("Couldn't create path, status %#x\n", status);
 287                         break;
 288                 }
 289                 sim = xpt_path_sim(path);
 290                 mtx_lock(sim->mtx);
 291                 status = targenable(softc, path, new_lun->grp6_len,
 292                                     new_lun->grp7_len);
 293                 xpt_free_path(path);
 294                 mtx_unlock(sim->mtx);
 295                 break;
 296         }
 297         case TARGIOCDISABLE:
 298                 if (softc->periph == NULL) {
 299                         status = CAM_DEV_NOT_THERE;
 300                         break;
 301                 }
 302                 cam_periph_lock(softc->periph);
 303                 status = targdisable(softc);
 304                 cam_periph_unlock(softc->periph);
 305                 break;
 306         case TARGIOCDEBUG:
 307         {
 308 #ifdef  CAMDEBUG
 309                 struct ccb_debug cdbg;
 310
 311                 /* If no periph available, disallow debugging changes */
 312                 if ((softc->state & TARG_STATE_LUN_ENABLED) == 0) {
 313                         status = CAM_DEV_NOT_THERE;
 314                         break;
 315                 }
 316                 bzero(&cdbg, sizeof cdbg);
 317                 if (*((int *)addr) != 0)
 318                         cdbg.flags = CAM_DEBUG_PERIPH;
 319                 else
 320                         cdbg.flags = CAM_DEBUG_NONE;
 321                 cam_periph_lock(softc->periph);
 322                 xpt_setup_ccb(&cdbg.ccb_h, softc->path, CAM_PRIORITY_NORMAL);
 323                 cdbg.ccb_h.func_code = XPT_DEBUG;
 324                 cdbg.ccb_h.cbfcnp = targdone;
 325
 326                 xpt_action((union ccb *)&cdbg);
 327                 cam_periph_unlock(softc->periph);
 328                 status = cdbg.ccb_h.status & CAM_STATUS_MASK;
 329 #else
 330                 status = CAM_FUNC_NOTAVAIL;
 331 #endif
 332                 break;
 333         }
 334         default:
 335                 status = CAM_PROVIDE_FAIL;
 336                 break;
 337         }
 338
 339         return (targcamstatus(status));
 340 }
 341
 342 /* Writes are always ready, reads wait for user_ccb_queue or abort_queue */
 343 static int
 344 targpoll(struct cdev *dev, int poll_events, struct thread *td)
 345 {
 346         struct targ_softc *softc;
 347         int     revents;
 348
 349         softc = (struct targ_softc *)dev->si_drv1;
 350
 351         /* Poll for write() is always ok. */
 352         revents = poll_events & (POLLOUT | POLLWRNORM);
 353         if ((poll_events & (POLLIN | POLLRDNORM)) != 0) {
 354                 /* Poll for read() depends on user and abort queues. */
 355                 cam_periph_lock(softc->periph);
 356                 if (!TAILQ_EMPTY(&softc->user_ccb_queue) ||
 357                     !TAILQ_EMPTY(&softc->abort_queue)) {
 358                         revents |= poll_events & (POLLIN | POLLRDNORM);
 359                 }
 360                 cam_periph_unlock(softc->periph);
 361                 /* Only sleep if the user didn't poll for write. */
 362                 if (revents == 0)
 363                         selrecord(td, &softc->read_select);
 364         }
 365
 366         return (revents);
 367 }
 368
 369 static int
 370 targkqfilter(struct cdev *dev, struct knote *kn)
 371 {
 372         struct  targ_softc *softc;
 373
 374         softc = (struct targ_softc *)dev->si_drv1;
 375         kn->kn_hook = (caddr_t)softc;
 376         kn->kn_fop = &targread_filtops;
 377         knlist_add(&softc->read_select.si_note, kn, 0);
 378         return (0);
 379 }
 380
 381 static void
 382 targreadfiltdetach(struct knote *kn)
 383 {
 384         struct  targ_softc *softc;
 385
 386         softc = (struct targ_softc *)kn->kn_hook;
 387         knlist_remove(&softc->read_select.si_note, kn, 0);
 388 }
 389
 390 /* Notify the user's kqueue when the user queue or abort queue gets a CCB */
 391 static int
 392 targreadfilt(struct knote *kn, long hint)
 393 {
 394         struct targ_softc *softc;
 395         int     retval;
 396
 397         softc = (struct targ_softc *)kn->kn_hook;
 398         cam_periph_lock(softc->periph);
 399         retval = !TAILQ_EMPTY(&softc->user_ccb_queue) ||
 400                  !TAILQ_EMPTY(&softc->abort_queue);
 401         cam_periph_unlock(softc->periph);
 402         return (retval);
 403 }
 404
 405 /* Send the HBA the enable/disable message */
 406 static cam_status
 407 targendislun(struct cam_path *path, int enable, int grp6_len, int grp7_len)
 408 {
 409         struct ccb_en_lun en_ccb;
 410         cam_status        status;
 411
 412         /* Tell the lun to begin answering selects */
 413         xpt_setup_ccb(&en_ccb.ccb_h, path, CAM_PRIORITY_NORMAL);
 414         en_ccb.ccb_h.func_code = XPT_EN_LUN;
 415         /* Don't need support for any vendor specific commands */
 416         en_ccb.grp6_len = grp6_len;
 417         en_ccb.grp7_len = grp7_len;
 418         en_ccb.enable = enable ? 1 : 0;
 419         xpt_action((union ccb *)&en_ccb);
 420         status = en_ccb.ccb_h.status & CAM_STATUS_MASK;
 421         if (status != CAM_REQ_CMP) {
 422                 xpt_print(path, "%sable lun CCB rejected, status %#x\n",
 423                     enable ? "en" : "dis", status);
 424         }
 425         return (status);
 426 }
 427
 428 /* Enable target mode on a LUN, given its path */
 429 static cam_status
 430 targenable(struct targ_softc *softc, struct cam_path *path, int grp6_len,
 431            int grp7_len)
 432 {
 433         struct cam_periph *periph;
 434         struct ccb_pathinq cpi;
 435         cam_status         status;
 436
 437         if ((softc->state & TARG_STATE_LUN_ENABLED) != 0)
 438                 return (CAM_LUN_ALRDY_ENA);
 439
 440         /* Make sure SIM supports target mode */
 441         xpt_setup_ccb(&cpi.ccb_h, path, CAM_PRIORITY_NORMAL);
 442         cpi.ccb_h.func_code = XPT_PATH_INQ;
 443         xpt_action((union ccb *)&cpi);
 444         status = cpi.ccb_h.status & CAM_STATUS_MASK;
 445         if (status != CAM_REQ_CMP) {
 446                 printf("pathinq failed, status %#x\n", status);
 447                 goto enable_fail;
 448         }
 449         if ((cpi.target_sprt & PIT_PROCESSOR) == 0) {
 450                 printf("controller does not support target mode\n");
 451                 status = CAM_FUNC_NOTAVAIL;
 452                 goto enable_fail;
 453         }
 454
 455         /* Destroy any periph on our path if it is disabled */
 456         periph = cam_periph_find(path, "targ");
 457         if (periph != NULL) {
 458                 struct targ_softc *del_softc;
 459
 460                 del_softc = (struct targ_softc *)periph->softc;
 461                 if ((del_softc->state & TARG_STATE_LUN_ENABLED) == 0) {
 462                         cam_periph_invalidate(del_softc->periph);
 463                         del_softc->periph = NULL;
 464                 } else {
 465                         printf("Requested path still in use by targ%d\n",
 466                                periph->unit_number);
 467                         status = CAM_LUN_ALRDY_ENA;
 468                         goto enable_fail;
 469                 }
 470         }
 471
 472         /* Create a periph instance attached to this path */
 473         status = cam_periph_alloc(targctor, NULL, targdtor, targstart,
 474                         "targ", CAM_PERIPH_BIO, path, targasync, 0, softc);
 475         if (status != CAM_REQ_CMP) {
 476                 printf("cam_periph_alloc failed, status %#x\n", status);
 477                 goto enable_fail;
 478         }
 479
 480         /* Ensure that the periph now exists. */
 481         if (cam_periph_find(path, "targ") == NULL) {
 482                 panic("targenable: succeeded but no periph?");
 483                 /* NOTREACHED */
 484         }
 485
 486         /* Send the enable lun message */
 487         status = targendislun(path, /*enable*/1, grp6_len, grp7_len);
 488         if (status != CAM_REQ_CMP) {
 489                 printf("enable lun failed, status %#x\n", status);
 490                 goto enable_fail;
 491         }
 492         softc->state |= TARG_STATE_LUN_ENABLED;
 493
 494 enable_fail:
 495         return (status);
 496 }
 497
 498 /* Disable this softc's target instance if enabled */
 499 static cam_status
 500 targdisable(struct targ_softc *softc)
 501 {
 502         cam_status status;
 503
 504         if ((softc->state & TARG_STATE_LUN_ENABLED) == 0)
 505                 return (CAM_REQ_CMP);
 506
 507         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targdisable\n"));
 508
 509         /* Abort any ccbs pending on the controller */
 510         abort_all_pending(softc);
 511
 512         /* Disable this lun */
 513         status = targendislun(softc->path, /*enable*/0,
 514                               /*grp6_len*/0, /*grp7_len*/0);
 515         if (status == CAM_REQ_CMP)
 516                 softc->state &= ~TARG_STATE_LUN_ENABLED;
 517         else
 518                 printf("Disable lun failed, status %#x\n", status);
 519
 520         return (status);
 521 }
 522
 523 /* Initialize a periph (called from cam_periph_alloc) */
 524 static cam_status
 525 targctor(struct cam_periph *periph, void *arg)
 526 {
 527         struct targ_softc *softc;
 528
 529         /* Store pointer to softc for periph-driven routines */
 530         softc = (struct targ_softc *)arg;
 531         periph->softc = softc;
 532         softc->periph = periph;
 533         softc->path = periph->path;
 534         return (CAM_REQ_CMP);
 535 }
 536
 537 static void
 538 targdtor(struct cam_periph *periph)
 539 {
 540         struct targ_softc     *softc;
 541         struct ccb_hdr        *ccb_h;
 542         struct targ_cmd_descr *descr;
 543
 544         softc = (struct targ_softc *)periph->softc;
 545
 546         /*
 547          * targdisable() aborts CCBs back to the user and leaves them
 548          * on user_ccb_queue and abort_queue in case the user is still
 549          * interested in them.  We free them now.
 550          */
 551         while ((ccb_h = TAILQ_FIRST(&softc->user_ccb_queue)) != NULL) {
 552                 TAILQ_REMOVE(&softc->user_ccb_queue, ccb_h, periph_links.tqe);
 553                 targfreeccb(softc, (union ccb *)ccb_h);
 554         }
 555         while ((descr = TAILQ_FIRST(&softc->abort_queue)) != NULL) {
 556                 TAILQ_REMOVE(&softc->abort_queue, descr, tqe);
 557                 free(descr, M_TARG);
 558         }
 559
 560         softc->periph = NULL;
 561         softc->path = NULL;
 562         periph->softc = NULL;
 563 }
 564
 565 /* Receive CCBs from user mode proc and send them to the HBA */
 566 static int
 567 targwrite(struct cdev *dev, struct uio *uio, int ioflag)
 568 {
 569         union ccb *user_ccb;
 570         struct targ_softc *softc;
 571         struct targ_cmd_descr *descr;
 572         int write_len, error;
 573         int func_code, priority;
 574
 575         softc = (struct targ_softc *)dev->si_drv1;
 576         write_len = error = 0;
 577         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
 578                   ("write - uio_resid %zd\n", uio->uio_resid));
 579         while (uio->uio_resid >= sizeof(user_ccb) && error == 0) {
 580                 union ccb *ccb;
 581
 582                 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio);
 583                 if (error != 0) {
 584                         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
 585                                   ("write - uiomove failed (%d)\n", error));
 586                         break;
 587                 }
 588                 priority = fuword32(&user_ccb->ccb_h.pinfo.priority);
 589                 if (priority == CAM_PRIORITY_NONE) {
 590                         error = EINVAL;
 591                         break;
 592                 }
 593                 func_code = fuword32(&user_ccb->ccb_h.func_code);
 594                 switch (func_code) {
 595                 case XPT_ACCEPT_TARGET_IO:
 596                 case XPT_IMMED_NOTIFY:
 597                         cam_periph_lock(softc->periph);
 598                         ccb = targgetccb(softc, func_code, priority);
 599                         descr = (struct targ_cmd_descr *)ccb->ccb_h.targ_descr;
 600                         descr->user_ccb = user_ccb;
 601                         descr->func_code = func_code;
 602                         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
 603                                   ("Sent ATIO/INOT (%p)\n", user_ccb));
 604                         xpt_action(ccb);
 605                         TAILQ_INSERT_TAIL(&softc->pending_ccb_queue,
 606                                           &ccb->ccb_h,
 607                                           periph_links.tqe);
 608                         cam_periph_unlock(softc->periph);
 609                         break;
 610                 default:
 611                         cam_periph_lock(softc->periph);
 612                         if ((func_code & XPT_FC_QUEUED) != 0) {
 613                                 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
 614                                           ("Sending queued ccb %#x (%p)\n",
 615                                           func_code, user_ccb));
 616                                 descr = targgetdescr(softc);
 617                                 descr->user_ccb = user_ccb;
 618                                 descr->priority = priority;
 619                                 descr->func_code = func_code;
 620                                 TAILQ_INSERT_TAIL(&softc->work_queue,
 621                                                   descr, tqe);
 622                                 xpt_schedule(softc->periph, priority);
 623                         } else {
 624                                 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
 625                                           ("Sending inline ccb %#x (%p)\n",
 626                                           func_code, user_ccb));
 627                                 ccb = targgetccb(softc, func_code, priority);
 628                                 descr = (struct targ_cmd_descr *)
 629                                          ccb->ccb_h.targ_descr;
 630                                 descr->user_ccb = user_ccb;
 631                                 descr->priority = priority;
 632                                 descr->func_code = func_code;
 633                                 if (targusermerge(softc, descr, ccb) != EFAULT)
 634                                         targsendccb(softc, ccb, descr);
 635                                 targreturnccb(softc, ccb);
 636                         }
 637                         cam_periph_unlock(softc->periph);
 638                         break;
 639                 }
 640                 write_len += sizeof(user_ccb);
 641         }
 642
 643         /*
 644          * If we've successfully taken in some amount of
 645          * data, return success for that data first.  If
 646          * an error is persistent, it will be reported
 647          * on the next write.
 648          */
 649         if (error != 0 && write_len == 0)
 650                 return (error);
 651         if (write_len == 0 && uio->uio_resid != 0)
 652                 return (ENOSPC);
 653         return (0);
 654 }
 655
 656 /* Process requests (descrs) via the periph-supplied CCBs */
 657 static void
 658 targstart(struct cam_periph *periph, union ccb *start_ccb)
 659 {
 660         struct targ_softc *softc;
 661         struct targ_cmd_descr *descr, *next_descr;
 662         int error;
 663
 664         softc = (struct targ_softc *)periph->softc;
 665         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targstart %p\n", start_ccb));
 666
 667         descr = TAILQ_FIRST(&softc->work_queue);
 668         if (descr == NULL) {
 669                 xpt_release_ccb(start_ccb);
 670         } else {
 671                 TAILQ_REMOVE(&softc->work_queue, descr, tqe);
 672                 next_descr = TAILQ_FIRST(&softc->work_queue);
 673
 674                 /* Initiate a transaction using the descr and supplied CCB */
 675                 error = targusermerge(softc, descr, start_ccb);
 676                 if (error == 0)
 677                         error = targsendccb(softc, start_ccb, descr);
 678                 if (error != 0) {
 679                         xpt_print(periph->path,
 680                             "targsendccb failed, err %d\n", error);
 681                         xpt_release_ccb(start_ccb);
 682                         suword(&descr->user_ccb->ccb_h.status,
 683                                CAM_REQ_CMP_ERR);
 684                         TAILQ_INSERT_TAIL(&softc->abort_queue, descr, tqe);
 685                         notify_user(softc);
 686                 }
 687
 688                 /* If we have more work to do, stay scheduled */
 689                 if (next_descr != NULL)
 690                         xpt_schedule(periph, next_descr->priority);
 691         }
 692 }
 693
 694 static int
 695 targusermerge(struct targ_softc *softc, struct targ_cmd_descr *descr,
 696               union ccb *ccb)
 697 {
 698         struct ccb_hdr *u_ccbh, *k_ccbh;
 699         size_t ccb_len;
 700         int error;
 701
 702         u_ccbh = &descr->user_ccb->ccb_h;
 703         k_ccbh = &ccb->ccb_h;
 704
 705         /*
 706          * There are some fields in the CCB header that need to be
 707          * preserved, the rest we get from the user ccb. (See xpt_merge_ccb)
 708          */
 709         xpt_setup_ccb(k_ccbh, softc->path, descr->priority);
 710         k_ccbh->retry_count = fuword32(&u_ccbh->retry_count);
 711         k_ccbh->func_code = descr->func_code;
 712         k_ccbh->flags = fuword32(&u_ccbh->flags);
 713         k_ccbh->timeout = fuword32(&u_ccbh->timeout);
 714         ccb_len = targccblen(k_ccbh->func_code) - sizeof(struct ccb_hdr);
 715         error = copyin(u_ccbh + 1, k_ccbh + 1, ccb_len);
 716         if (error != 0) {
 717                 k_ccbh->status = CAM_REQ_CMP_ERR;
 718                 return (error);
 719         }
 720
 721         /* Translate usermode abort_ccb pointer to its kernel counterpart */
 722         if (k_ccbh->func_code == XPT_ABORT) {
 723                 struct ccb_abort *cab;
 724                 struct ccb_hdr *ccb_h;
 725
 726                 cab = (struct ccb_abort *)ccb;
 727                 TAILQ_FOREACH(ccb_h, &softc->pending_ccb_queue,
 728                     periph_links.tqe) {
 729                         struct targ_cmd_descr *ab_descr;
 730
 731                         ab_descr = (struct targ_cmd_descr *)ccb_h->targ_descr;
 732                         if (ab_descr->user_ccb == cab->abort_ccb) {
 733                                 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
 734                                           ("Changing abort for %p to %p\n",
 735                                           cab->abort_ccb, ccb_h));
 736                                 cab->abort_ccb = (union ccb *)ccb_h;
 737                                 break;
 738                         }
 739                 }
 740                 /* CCB not found, set appropriate status */
 741                 if (ccb_h == NULL) {
 742                         k_ccbh->status = CAM_PATH_INVALID;
 743                         error = ESRCH;
 744                 }
 745         }
 746
 747         return (error);
 748 }
 749
 750 /* Build and send a kernel CCB formed from descr->user_ccb */
 751 static int
 752 targsendccb(struct targ_softc *softc, union ccb *ccb,
 753             struct targ_cmd_descr *descr)
 754 {
 755         struct cam_periph_map_info *mapinfo;
 756         struct ccb_hdr *ccb_h;
 757         int error;
 758
 759         ccb_h = &ccb->ccb_h;
 760         mapinfo = &descr->mapinfo;
 761         mapinfo->num_bufs_used = 0;
 762
 763         /*
 764          * There's no way for the user to have a completion
 765          * function, so we put our own completion function in here.
 766          * We also stash in a reference to our descriptor so targreturnccb()
 767          * can find our mapping info.
 768          */
 769         ccb_h->cbfcnp = targdone;
 770         ccb_h->targ_descr = descr;
 771
 772         /*
 773          * We only attempt to map the user memory into kernel space
 774          * if they haven't passed in a physical memory pointer,
 775          * and if there is actually an I/O operation to perform.
 776          * Right now cam_periph_mapmem() only supports SCSI and device
 777          * match CCBs.  For the SCSI CCBs, we only pass the CCB in if
 778          * there's actually data to map.  cam_periph_mapmem() will do the
 779          * right thing, even if there isn't data to map, but since CCBs
 780          * without data are a reasonably common occurance (e.g. test unit
 781          * ready), it will save a few cycles if we check for it here.
 782          */
 783         if (((ccb_h->flags & CAM_DATA_PHYS) == 0)
 784          && (((ccb_h->func_code == XPT_CONT_TARGET_IO)
 785             && ((ccb_h->flags & CAM_DIR_MASK) != CAM_DIR_NONE))
 786           || (ccb_h->func_code == XPT_DEV_MATCH))) {
 787
 788                 error = cam_periph_mapmem(ccb, mapinfo);
 789
 790                 /*
 791                  * cam_periph_mapmem returned an error, we can't continue.
 792                  * Return the error to the user.
 793                  */
 794                 if (error) {
 795                         ccb_h->status = CAM_REQ_CMP_ERR;
 796                         mapinfo->num_bufs_used = 0;
 797                         return (error);
 798                 }
 799         }
 800
 801         /*
 802          * Once queued on the pending CCB list, this CCB will be protected
 803          * by our error recovery handler.
 804          */
 805         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("sendccb %p\n", ccb));
 806         if (XPT_FC_IS_QUEUED(ccb)) {
 807                 TAILQ_INSERT_TAIL(&softc->pending_ccb_queue, ccb_h,
 808                                   periph_links.tqe);
 809         }
 810         xpt_action(ccb);
 811
 812         return (0);
 813 }
 814
 815 /* Completion routine for CCBs (called at splsoftcam) */
 816 static void
 817 targdone(struct cam_periph *periph, union ccb *done_ccb)
 818 {
 819         struct targ_softc *softc;
 820         cam_status status;
 821
 822         CAM_DEBUG(periph->path, CAM_DEBUG_PERIPH, ("targdone %p\n", done_ccb));
 823         softc = (struct targ_softc *)periph->softc;
 824         TAILQ_REMOVE(&softc->pending_ccb_queue, &done_ccb->ccb_h,
 825                      periph_links.tqe);
 826         status = done_ccb->ccb_h.status & CAM_STATUS_MASK;
 827
 828         /* If we're no longer enabled, throw away CCB */
 829         if ((softc->state & TARG_STATE_LUN_ENABLED) == 0) {
 830                 targfreeccb(softc, done_ccb);
 831                 return;
 832         }
 833         /* abort_all_pending() waits for pending queue to be empty */
 834         if (TAILQ_EMPTY(&softc->pending_ccb_queue))
 835                 wakeup(&softc->pending_ccb_queue);
 836
 837         switch (done_ccb->ccb_h.func_code) {
 838         /* All FC_*_QUEUED CCBs go back to userland */
 839         case XPT_IMMED_NOTIFY:
 840         case XPT_ACCEPT_TARGET_IO:
 841         case XPT_CONT_TARGET_IO:
 842                 TAILQ_INSERT_TAIL(&softc->user_ccb_queue, &done_ccb->ccb_h,
 843                                   periph_links.tqe);
 844                 cam_periph_unlock(softc->periph);
 845                 notify_user(softc);
 846                 cam_periph_lock(softc->periph);
 847                 break;
 848         default:
 849                 panic("targdone: impossible xpt opcode %#x",
 850                       done_ccb->ccb_h.func_code);
 851                 /* NOTREACHED */
 852         }
 853 }
 854
 855 /* Return CCBs to the user from the user queue and abort queue */
 856 static int
 857 targread(struct cdev *dev, struct uio *uio, int ioflag)
 858 {
 859         struct descr_queue      *abort_queue;
 860         struct targ_cmd_descr   *user_descr;
 861         struct targ_softc       *softc;
 862         struct ccb_queue  *user_queue;
 863         struct ccb_hdr    *ccb_h;
 864         union  ccb        *user_ccb;
 865         int                read_len, error;
 866
 867         error = 0;
 868         read_len = 0;
 869         softc = (struct targ_softc *)dev->si_drv1;
 870         user_queue = &softc->user_ccb_queue;
 871         abort_queue = &softc->abort_queue;
 872         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targread\n"));
 873
 874         /* If no data is available, wait or return immediately */
 875         cam_periph_lock(softc->periph);
 876         ccb_h = TAILQ_FIRST(user_queue);
 877         user_descr = TAILQ_FIRST(abort_queue);
 878         while (ccb_h == NULL && user_descr == NULL) {
 879                 if ((ioflag & IO_NDELAY) == 0) {
 880                         error = msleep(user_queue, softc->periph->sim->mtx,
 881                             PRIBIO | PCATCH, "targrd", 0);
 882                         ccb_h = TAILQ_FIRST(user_queue);
 883                         user_descr = TAILQ_FIRST(abort_queue);
 884                         if (error != 0) {
 885                                 if (error == ERESTART) {
 886                                         continue;
 887                                 } else {
 888                                         goto read_fail;
 889                                 }
 890                         }
 891                 } else {
 892                         cam_periph_unlock(softc->periph);
 893                         return (EAGAIN);
 894                 }
 895         }
 896
 897         /* Data is available so fill the user's buffer */
 898         while (ccb_h != NULL) {
 899                 struct targ_cmd_descr *descr;
 900
 901                 if (uio->uio_resid < sizeof(user_ccb))
 902                         break;
 903                 TAILQ_REMOVE(user_queue, ccb_h, periph_links.tqe);
 904                 descr = (struct targ_cmd_descr *)ccb_h->targ_descr;
 905                 user_ccb = descr->user_ccb;
 906                 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
 907                           ("targread ccb %p (%p)\n", ccb_h, user_ccb));
 908                 error = targreturnccb(softc, (union ccb *)ccb_h);
 909                 if (error != 0)
 910                         goto read_fail;
 911                 cam_periph_unlock(softc->periph);
 912                 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio);
 913                 cam_periph_lock(softc->periph);
 914                 if (error != 0)
 915                         goto read_fail;
 916                 read_len += sizeof(user_ccb);
 917
 918                 ccb_h = TAILQ_FIRST(user_queue);
 919         }
 920
 921         /* Flush out any aborted descriptors */
 922         while (user_descr != NULL) {
 923                 if (uio->uio_resid < sizeof(user_ccb))
 924                         break;
 925                 TAILQ_REMOVE(abort_queue, user_descr, tqe);
 926                 user_ccb = user_descr->user_ccb;
 927                 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
 928                           ("targread aborted descr %p (%p)\n",
 929                           user_descr, user_ccb));
 930                 suword(&user_ccb->ccb_h.status, CAM_REQ_ABORTED);
 931                 cam_periph_unlock(softc->periph);
 932                 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio);
 933                 cam_periph_lock(softc->periph);
 934                 if (error != 0)
 935                         goto read_fail;
 936                 read_len += sizeof(user_ccb);
 937
 938                 user_descr = TAILQ_FIRST(abort_queue);
 939         }
 940
 941         /*
 942          * If we've successfully read some amount of data, don't report an
 943          * error.  If the error is persistent, it will be reported on the
 944          * next read().
 945          */
 946         if (read_len == 0 && uio->uio_resid != 0)
 947                 error = ENOSPC;
 948
 949 read_fail:
 950         cam_periph_unlock(softc->periph);
 951         return (error);
 952 }
 953
 954 /* Copy completed ccb back to the user */
 955 static int
 956 targreturnccb(struct targ_softc *softc, union ccb *ccb)
 957 {
 958         struct targ_cmd_descr *descr;
 959         struct ccb_hdr *u_ccbh;
 960         size_t ccb_len;
 961         int error;
 962
 963         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targreturnccb %p\n", ccb));
 964         descr = (struct targ_cmd_descr *)ccb->ccb_h.targ_descr;
 965         u_ccbh = &descr->user_ccb->ccb_h;
 966
 967         /* Copy out the central portion of the ccb_hdr */
 968         copyout(&ccb->ccb_h.retry_count, &u_ccbh->retry_count,
 969                 offsetof(struct ccb_hdr, periph_priv) -
 970                 offsetof(struct ccb_hdr, retry_count));
 971
 972         /* Copy out the rest of the ccb (after the ccb_hdr) */
 973         ccb_len = targccblen(ccb->ccb_h.func_code) - sizeof(struct ccb_hdr);
 974         if (descr->mapinfo.num_bufs_used != 0)
 975                 cam_periph_unmapmem(ccb, &descr->mapinfo);
 976         error = copyout(&ccb->ccb_h + 1, u_ccbh + 1, ccb_len);
 977         if (error != 0) {
 978                 xpt_print(softc->path,
 979                     "targreturnccb - CCB copyout failed (%d)\n", error);
 980         }
 981         /* Free CCB or send back to devq. */
 982         targfreeccb(softc, ccb);
 983
 984         return (error);
 985 }
 986
 987 static union ccb *
 988 targgetccb(struct targ_softc *softc, xpt_opcode type, int priority)
 989 {
 990         union ccb *ccb;
 991         int ccb_len;
 992
 993         ccb_len = targccblen(type);
 994         ccb = malloc(ccb_len, M_TARG, M_NOWAIT);
 995         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("getccb %p\n", ccb));
 996         if (ccb == NULL) {
 997                 return (ccb);
 998         }
 999         xpt_setup_ccb(&ccb->ccb_h, softc->path, priority);
1000         ccb->ccb_h.func_code = type;
1001         ccb->ccb_h.cbfcnp = targdone;
1002         ccb->ccb_h.targ_descr = targgetdescr(softc);
1003         if (ccb->ccb_h.targ_descr == NULL) {
1004                 free (ccb, M_TARG);
1005                 ccb = NULL;
1006         }
1007         return (ccb);
1008 }
1009
1010 static void
1011 targfreeccb(struct targ_softc *softc, union ccb *ccb)
1012 {
1013         CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, ("targfreeccb descr %p and\n",
1014                         ccb->ccb_h.targ_descr));
1015         free(ccb->ccb_h.targ_descr, M_TARG);
1016
1017         switch (ccb->ccb_h.func_code) {
1018         case XPT_ACCEPT_TARGET_IO:
1019         case XPT_IMMED_NOTIFY:
1020                 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, ("freeing ccb %p\n", ccb));
1021                 free(ccb, M_TARG);
1022                 break;
1023         default:
1024                 /* Send back CCB if we got it from the periph */
1025                 if (XPT_FC_IS_QUEUED(ccb)) {
1026                         CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH,
1027                                         ("returning queued ccb %p\n", ccb));
1028                         xpt_release_ccb(ccb);
1029                 } else {
1030                         CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH,
1031                                         ("freeing ccb %p\n", ccb));
1032                         free(ccb, M_TARG);
1033                 }
1034                 break;
1035         }
1036 }
1037
1038 static struct targ_cmd_descr *
1039 targgetdescr(struct targ_softc *softc)
1040 {
1041         struct targ_cmd_descr *descr;
1042
1043         descr = malloc(sizeof(*descr), M_TARG,
1044                M_NOWAIT);
1045         if (descr) {
1046                 descr->mapinfo.num_bufs_used = 0;
1047         }
1048         return (descr);
1049 }
1050
1051 static void
1052 targinit(void)
1053 {
1054         EVENTHANDLER_REGISTER(dev_clone, targclone, 0, 1000);
1055 }
1056
1057 static void
1058 targclone(void *arg, struct ucred *cred, char *name, int namelen,
1059     struct cdev **dev)
1060 {
1061         int u;
1062
1063         if (*dev != NULL)
1064                 return;
1065         if (dev_stdclone(name, NULL, "targ", &u) != 1)
1066                 return;
1067         *dev = make_dev(&targ_cdevsw, u, UID_ROOT, GID_WHEEL,
1068                         0600, "targ%d", u);
1069         dev_ref(*dev);
1070         (*dev)->si_flags |= SI_CHEAPCLONE;
1071 }
1072
1073 static void
1074 targasync(void *callback_arg, u_int32_t code, struct cam_path *path, void *arg)
1075 {
1076         /* All events are handled in usermode by INOTs */
1077         panic("targasync() called, should be an INOT instead");
1078 }
1079
1080 /* Cancel all pending requests and CCBs awaiting work. */
1081 static void
1082 abort_all_pending(struct targ_softc *softc)
1083 {
1084         struct targ_cmd_descr   *descr;
1085         struct ccb_abort         cab;
1086         struct ccb_hdr          *ccb_h;
1087         struct cam_sim          *sim;
1088
1089         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("abort_all_pending\n"));
1090
1091         /* First abort the descriptors awaiting resources */
1092         while ((descr = TAILQ_FIRST(&softc->work_queue)) != NULL) {
1093                 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
1094                           ("Aborting descr from workq %p\n", descr));
1095                 TAILQ_REMOVE(&softc->work_queue, descr, tqe);
1096                 TAILQ_INSERT_TAIL(&softc->abort_queue, descr, tqe);
1097         }
1098
1099         /*
1100          * Then abort all pending CCBs.
1101          * targdone() will return the aborted CCB via user_ccb_queue
1102          */
1103         xpt_setup_ccb(&cab.ccb_h, softc->path, CAM_PRIORITY_NORMAL);
1104         cab.ccb_h.func_code = XPT_ABORT;
1105         cab.ccb_h.status = CAM_REQ_CMP_ERR;
1106         TAILQ_FOREACH(ccb_h, &softc->pending_ccb_queue, periph_links.tqe) {
1107                 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
1108                           ("Aborting pending CCB %p\n", ccb_h));
1109                 cab.abort_ccb = (union ccb *)ccb_h;
1110                 xpt_action((union ccb *)&cab);
1111                 if (cab.ccb_h.status != CAM_REQ_CMP) {
1112                         xpt_print(cab.ccb_h.path,
1113                             "Unable to abort CCB, status %#x\n",
1114                             cab.ccb_h.status);
1115                 }
1116         }
1117
1118         /* If we aborted at least one pending CCB ok, wait for it. */
1119         if (cab.ccb_h.status == CAM_REQ_CMP) {
1120                 sim = xpt_path_sim(softc->path);
1121                 msleep(&softc->pending_ccb_queue, sim->mtx,
1122                        PRIBIO | PCATCH, "tgabrt", 0);
1123         }
1124
1125         /* If we aborted anything from the work queue, wakeup user. */
1126         if (!TAILQ_EMPTY(&softc->user_ccb_queue)
1127          || !TAILQ_EMPTY(&softc->abort_queue)) {
1128                 cam_periph_unlock(softc->periph);
1129                 notify_user(softc);
1130                 cam_periph_lock(softc->periph);
1131         }
1132 }
1133
1134 /* Notify the user that data is ready */
1135 static void
1136 notify_user(struct targ_softc *softc)
1137 {
1138         /*
1139          * Notify users sleeping via poll(), kqueue(), and
1140          * blocking read().
1141          */
1142         selwakeuppri(&softc->read_select, PRIBIO);
1143         KNOTE_UNLOCKED(&softc->read_select.si_note, 0);
1144         wakeup(&softc->user_ccb_queue);
1145 }
1146
1147 /* Convert CAM status to errno values */
1148 static int
1149 targcamstatus(cam_status status)
1150 {
1151         switch (status & CAM_STATUS_MASK) {
1152         case CAM_REQ_CMP:       /* CCB request completed without error */
1153                 return (0);
1154         case CAM_REQ_INPROG:    /* CCB request is in progress */
1155                 return (EINPROGRESS);
1156         case CAM_REQ_CMP_ERR:   /* CCB request completed with an error */
1157                 return (EIO);
1158         case CAM_PROVIDE_FAIL:  /* Unable to provide requested capability */
1159                 return (ENOTTY);
1160         case CAM_FUNC_NOTAVAIL: /* The requested function is not available */
1161                 return (ENOTSUP);
1162         case CAM_LUN_ALRDY_ENA: /* LUN is already enabled for target mode */
1163                 return (EADDRINUSE);
1164         case CAM_PATH_INVALID:  /* Supplied Path ID is invalid */
1165         case CAM_DEV_NOT_THERE: /* SCSI Device Not Installed/there */
1166                 return (ENOENT);
1167         case CAM_REQ_ABORTED:   /* CCB request aborted by the host */
1168                 return (ECANCELED);
1169         case CAM_CMD_TIMEOUT:   /* Command timeout */
1170                 return (ETIMEDOUT);
1171         case CAM_REQUEUE_REQ:   /* Requeue to preserve transaction ordering */
1172                 return (EAGAIN);
1173         case CAM_REQ_INVALID:   /* CCB request was invalid */
1174                 return (EINVAL);
1175         case CAM_RESRC_UNAVAIL: /* Resource Unavailable */
1176                 return (ENOMEM);
1177         case CAM_BUSY:          /* CAM subsystem is busy */
1178         case CAM_UA_ABORT:      /* Unable to abort CCB request */
1179                 return (EBUSY);
1180         default:
1181                 return (ENXIO);
1182         }
1183 }
1184
1185 static size_t
1186 targccblen(xpt_opcode func_code)
1187 {
1188         int len;
1189
1190         /* Codes we expect to see as a target */
1191         switch (func_code) {
1192         case XPT_CONT_TARGET_IO:
1193         case XPT_SCSI_IO:
1194                 len = sizeof(struct ccb_scsiio);
1195                 break;
1196         case XPT_ACCEPT_TARGET_IO:
1197                 len = sizeof(struct ccb_accept_tio);
1198                 break;
1199         case XPT_IMMED_NOTIFY:
1200                 len = sizeof(struct ccb_immed_notify);
1201                 break;
1202         case XPT_REL_SIMQ:
1203                 len = sizeof(struct ccb_relsim);
1204                 break;
1205         case XPT_PATH_INQ:
1206                 len = sizeof(struct ccb_pathinq);
1207                 break;
1208         case XPT_DEBUG:
1209                 len = sizeof(struct ccb_debug);
1210                 break;
1211         case XPT_ABORT:
1212                 len = sizeof(struct ccb_abort);
1213                 break;
1214         case XPT_EN_LUN:
1215                 len = sizeof(struct ccb_en_lun);
1216                 break;
1217         default:
1218                 len = sizeof(union ccb);
1219                 break;
1220         }
1221
1222         return (len);
1223 }
1224
1225 /*
1226  * work around to destroy targ device
1227  * outside of targclose
1228  */
1229 static void
1230 targdestroy(void *dev)
1231 {
1232         struct cdev *device = (struct cdev *)dev;
1233         struct targ_softc *softc = (struct targ_softc *)device->si_drv1;
1234
1235 #if 0
1236         callout_stop(&softc->destroy_dev_callout);
1237 #endif
1238
1239         mtx_unlock(&softc->destroy_mtx);
1240         mtx_destroy(&softc->destroy_mtx);
1241         free(softc, M_TARG);
1242         device->si_drv1 = 0;
1243         destroy_dev(device);
1244         printf("%s: destroyed dev\n", __func__);
1245 }