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