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                 struct ccb_debug cdbg;
 309
 310                 /* If no periph available, disallow debugging changes */
 311                 if ((softc->state & TARG_STATE_LUN_ENABLED) == 0) {
 312                         status = CAM_DEV_NOT_THERE;
 313                         break;
 314                 }
 315                 bzero(&cdbg, sizeof cdbg);
 316                 if (*((int *)addr) != 0)
 317                         cdbg.flags = CAM_DEBUG_PERIPH;
 318                 else
 319                         cdbg.flags = CAM_DEBUG_NONE;
 320                 cam_periph_lock(softc->periph);
 321                 xpt_setup_ccb(&cdbg.ccb_h, softc->path, CAM_PRIORITY_NORMAL);
 322                 cdbg.ccb_h.func_code = XPT_DEBUG;
 323                 cdbg.ccb_h.cbfcnp = targdone;
 324
 325                 xpt_action((union ccb *)&cdbg);
 326                 cam_periph_unlock(softc->periph);
 327                 status = cdbg.ccb_h.status & CAM_STATUS_MASK;
 328                 break;
 329         }
 330         default:
 331                 status = CAM_PROVIDE_FAIL;
 332                 break;
 333         }
 334
 335         return (targcamstatus(status));
 336 }
 337
 338 /* Writes are always ready, reads wait for user_ccb_queue or abort_queue */
 339 static int
 340 targpoll(struct cdev *dev, int poll_events, struct thread *td)
 341 {
 342         struct targ_softc *softc;
 343         int     revents;
 344
 345         softc = (struct targ_softc *)dev->si_drv1;
 346
 347         /* Poll for write() is always ok. */
 348         revents = poll_events & (POLLOUT | POLLWRNORM);
 349         if ((poll_events & (POLLIN | POLLRDNORM)) != 0) {
 350                 /* Poll for read() depends on user and abort queues. */
 351                 cam_periph_lock(softc->periph);
 352                 if (!TAILQ_EMPTY(&softc->user_ccb_queue) ||
 353                     !TAILQ_EMPTY(&softc->abort_queue)) {
 354                         revents |= poll_events & (POLLIN | POLLRDNORM);
 355                 }
 356                 cam_periph_unlock(softc->periph);
 357                 /* Only sleep if the user didn't poll for write. */
 358                 if (revents == 0)
 359                         selrecord(td, &softc->read_select);
 360         }
 361
 362         return (revents);
 363 }
 364
 365 static int
 366 targkqfilter(struct cdev *dev, struct knote *kn)
 367 {
 368         struct  targ_softc *softc;
 369
 370         softc = (struct targ_softc *)dev->si_drv1;
 371         kn->kn_hook = (caddr_t)softc;
 372         kn->kn_fop = &targread_filtops;
 373         knlist_add(&softc->read_select.si_note, kn, 0);
 374         return (0);
 375 }
 376
 377 static void
 378 targreadfiltdetach(struct knote *kn)
 379 {
 380         struct  targ_softc *softc;
 381
 382         softc = (struct targ_softc *)kn->kn_hook;
 383         knlist_remove(&softc->read_select.si_note, kn, 0);
 384 }
 385
 386 /* Notify the user's kqueue when the user queue or abort queue gets a CCB */
 387 static int
 388 targreadfilt(struct knote *kn, long hint)
 389 {
 390         struct targ_softc *softc;
 391         int     retval;
 392
 393         softc = (struct targ_softc *)kn->kn_hook;
 394         cam_periph_lock(softc->periph);
 395         retval = !TAILQ_EMPTY(&softc->user_ccb_queue) ||
 396                  !TAILQ_EMPTY(&softc->abort_queue);
 397         cam_periph_unlock(softc->periph);
 398         return (retval);
 399 }
 400
 401 /* Send the HBA the enable/disable message */
 402 static cam_status
 403 targendislun(struct cam_path *path, int enable, int grp6_len, int grp7_len)
 404 {
 405         struct ccb_en_lun en_ccb;
 406         cam_status        status;
 407
 408         /* Tell the lun to begin answering selects */
 409         xpt_setup_ccb(&en_ccb.ccb_h, path, CAM_PRIORITY_NORMAL);
 410         en_ccb.ccb_h.func_code = XPT_EN_LUN;
 411         /* Don't need support for any vendor specific commands */
 412         en_ccb.grp6_len = grp6_len;
 413         en_ccb.grp7_len = grp7_len;
 414         en_ccb.enable = enable ? 1 : 0;
 415         xpt_action((union ccb *)&en_ccb);
 416         status = en_ccb.ccb_h.status & CAM_STATUS_MASK;
 417         if (status != CAM_REQ_CMP) {
 418                 xpt_print(path, "%sable lun CCB rejected, status %#x\n",
 419                     enable ? "en" : "dis", status);
 420         }
 421         return (status);
 422 }
 423
 424 /* Enable target mode on a LUN, given its path */
 425 static cam_status
 426 targenable(struct targ_softc *softc, struct cam_path *path, int grp6_len,
 427            int grp7_len)
 428 {
 429         struct cam_periph *periph;
 430         struct ccb_pathinq cpi;
 431         cam_status         status;
 432
 433         if ((softc->state & TARG_STATE_LUN_ENABLED) != 0)
 434                 return (CAM_LUN_ALRDY_ENA);
 435
 436         /* Make sure SIM supports target mode */
 437         xpt_setup_ccb(&cpi.ccb_h, path, CAM_PRIORITY_NORMAL);
 438         cpi.ccb_h.func_code = XPT_PATH_INQ;
 439         xpt_action((union ccb *)&cpi);
 440         status = cpi.ccb_h.status & CAM_STATUS_MASK;
 441         if (status != CAM_REQ_CMP) {
 442                 printf("pathinq failed, status %#x\n", status);
 443                 goto enable_fail;
 444         }
 445         if ((cpi.target_sprt & PIT_PROCESSOR) == 0) {
 446                 printf("controller does not support target mode\n");
 447                 status = CAM_FUNC_NOTAVAIL;
 448                 goto enable_fail;
 449         }
 450
 451         /* Destroy any periph on our path if it is disabled */
 452         periph = cam_periph_find(path, "targ");
 453         if (periph != NULL) {
 454                 struct targ_softc *del_softc;
 455
 456                 del_softc = (struct targ_softc *)periph->softc;
 457                 if ((del_softc->state & TARG_STATE_LUN_ENABLED) == 0) {
 458                         cam_periph_invalidate(del_softc->periph);
 459                         del_softc->periph = NULL;
 460                 } else {
 461                         printf("Requested path still in use by targ%d\n",
 462                                periph->unit_number);
 463                         status = CAM_LUN_ALRDY_ENA;
 464                         goto enable_fail;
 465                 }
 466         }
 467
 468         /* Create a periph instance attached to this path */
 469         status = cam_periph_alloc(targctor, NULL, targdtor, targstart,
 470                         "targ", CAM_PERIPH_BIO, path, targasync, 0, softc);
 471         if (status != CAM_REQ_CMP) {
 472                 printf("cam_periph_alloc failed, status %#x\n", status);
 473                 goto enable_fail;
 474         }
 475
 476         /* Ensure that the periph now exists. */
 477         if (cam_periph_find(path, "targ") == NULL) {
 478                 panic("targenable: succeeded but no periph?");
 479                 /* NOTREACHED */
 480         }
 481
 482         /* Send the enable lun message */
 483         status = targendislun(path, /*enable*/1, grp6_len, grp7_len);
 484         if (status != CAM_REQ_CMP) {
 485                 printf("enable lun failed, status %#x\n", status);
 486                 goto enable_fail;
 487         }
 488         softc->state |= TARG_STATE_LUN_ENABLED;
 489
 490 enable_fail:
 491         return (status);
 492 }
 493
 494 /* Disable this softc's target instance if enabled */
 495 static cam_status
 496 targdisable(struct targ_softc *softc)
 497 {
 498         cam_status status;
 499
 500         if ((softc->state & TARG_STATE_LUN_ENABLED) == 0)
 501                 return (CAM_REQ_CMP);
 502
 503         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targdisable\n"));
 504
 505         /* Abort any ccbs pending on the controller */
 506         abort_all_pending(softc);
 507
 508         /* Disable this lun */
 509         status = targendislun(softc->path, /*enable*/0,
 510                               /*grp6_len*/0, /*grp7_len*/0);
 511         if (status == CAM_REQ_CMP)
 512                 softc->state &= ~TARG_STATE_LUN_ENABLED;
 513         else
 514                 printf("Disable lun failed, status %#x\n", status);
 515
 516         return (status);
 517 }
 518
 519 /* Initialize a periph (called from cam_periph_alloc) */
 520 static cam_status
 521 targctor(struct cam_periph *periph, void *arg)
 522 {
 523         struct targ_softc *softc;
 524
 525         /* Store pointer to softc for periph-driven routines */
 526         softc = (struct targ_softc *)arg;
 527         periph->softc = softc;
 528         softc->periph = periph;
 529         softc->path = periph->path;
 530         return (CAM_REQ_CMP);
 531 }
 532
 533 static void
 534 targdtor(struct cam_periph *periph)
 535 {
 536         struct targ_softc     *softc;
 537         struct ccb_hdr        *ccb_h;
 538         struct targ_cmd_descr *descr;
 539
 540         softc = (struct targ_softc *)periph->softc;
 541
 542         /*
 543          * targdisable() aborts CCBs back to the user and leaves them
 544          * on user_ccb_queue and abort_queue in case the user is still
 545          * interested in them.  We free them now.
 546          */
 547         while ((ccb_h = TAILQ_FIRST(&softc->user_ccb_queue)) != NULL) {
 548                 TAILQ_REMOVE(&softc->user_ccb_queue, ccb_h, periph_links.tqe);
 549                 targfreeccb(softc, (union ccb *)ccb_h);
 550         }
 551         while ((descr = TAILQ_FIRST(&softc->abort_queue)) != NULL) {
 552                 TAILQ_REMOVE(&softc->abort_queue, descr, tqe);
 553                 free(descr, M_TARG);
 554         }
 555
 556         softc->periph = NULL;
 557         softc->path = NULL;
 558         periph->softc = NULL;
 559 }
 560
 561 /* Receive CCBs from user mode proc and send them to the HBA */
 562 static int
 563 targwrite(struct cdev *dev, struct uio *uio, int ioflag)
 564 {
 565         union ccb *user_ccb;
 566         struct targ_softc *softc;
 567         struct targ_cmd_descr *descr;
 568         int write_len, error;
 569         int func_code, priority;
 570
 571         softc = (struct targ_softc *)dev->si_drv1;
 572         write_len = error = 0;
 573         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
 574                   ("write - uio_resid %zd\n", uio->uio_resid));
 575         while (uio->uio_resid >= sizeof(user_ccb) && error == 0) {
 576                 union ccb *ccb;
 577
 578                 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio);
 579                 if (error != 0) {
 580                         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
 581                                   ("write - uiomove failed (%d)\n", error));
 582                         break;
 583                 }
 584                 priority = fuword32(&user_ccb->ccb_h.pinfo.priority);
 585                 if (priority == CAM_PRIORITY_NONE) {
 586                         error = EINVAL;
 587                         break;
 588                 }
 589                 func_code = fuword32(&user_ccb->ccb_h.func_code);
 590                 switch (func_code) {
 591                 case XPT_ACCEPT_TARGET_IO:
 592                 case XPT_IMMED_NOTIFY:
 593                         cam_periph_lock(softc->periph);
 594                         ccb = targgetccb(softc, func_code, priority);
 595                         descr = (struct targ_cmd_descr *)ccb->ccb_h.targ_descr;
 596                         descr->user_ccb = user_ccb;
 597                         descr->func_code = func_code;
 598                         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
 599                                   ("Sent ATIO/INOT (%p)\n", user_ccb));
 600                         xpt_action(ccb);
 601                         TAILQ_INSERT_TAIL(&softc->pending_ccb_queue,
 602                                           &ccb->ccb_h,
 603                                           periph_links.tqe);
 604                         cam_periph_unlock(softc->periph);
 605                         break;
 606                 default:
 607                         cam_periph_lock(softc->periph);
 608                         if ((func_code & XPT_FC_QUEUED) != 0) {
 609                                 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
 610                                           ("Sending queued ccb %#x (%p)\n",
 611                                           func_code, user_ccb));
 612                                 descr = targgetdescr(softc);
 613                                 descr->user_ccb = user_ccb;
 614                                 descr->priority = priority;
 615                                 descr->func_code = func_code;
 616                                 TAILQ_INSERT_TAIL(&softc->work_queue,
 617                                                   descr, tqe);
 618                                 xpt_schedule(softc->periph, priority);
 619                         } else {
 620                                 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
 621                                           ("Sending inline ccb %#x (%p)\n",
 622                                           func_code, user_ccb));
 623                                 ccb = targgetccb(softc, func_code, priority);
 624                                 descr = (struct targ_cmd_descr *)
 625                                          ccb->ccb_h.targ_descr;
 626                                 descr->user_ccb = user_ccb;
 627                                 descr->priority = priority;
 628                                 descr->func_code = func_code;
 629                                 if (targusermerge(softc, descr, ccb) != EFAULT)
 630                                         targsendccb(softc, ccb, descr);
 631                                 targreturnccb(softc, ccb);
 632                         }
 633                         cam_periph_unlock(softc->periph);
 634                         break;
 635                 }
 636                 write_len += sizeof(user_ccb);
 637         }
 638
 639         /*
 640          * If we've successfully taken in some amount of
 641          * data, return success for that data first.  If
 642          * an error is persistent, it will be reported
 643          * on the next write.
 644          */
 645         if (error != 0 && write_len == 0)
 646                 return (error);
 647         if (write_len == 0 && uio->uio_resid != 0)
 648                 return (ENOSPC);
 649         return (0);
 650 }
 651
 652 /* Process requests (descrs) via the periph-supplied CCBs */
 653 static void
 654 targstart(struct cam_periph *periph, union ccb *start_ccb)
 655 {
 656         struct targ_softc *softc;
 657         struct targ_cmd_descr *descr, *next_descr;
 658         int error;
 659
 660         softc = (struct targ_softc *)periph->softc;
 661         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targstart %p\n", start_ccb));
 662
 663         descr = TAILQ_FIRST(&softc->work_queue);
 664         if (descr == NULL) {
 665                 xpt_release_ccb(start_ccb);
 666         } else {
 667                 TAILQ_REMOVE(&softc->work_queue, descr, tqe);
 668                 next_descr = TAILQ_FIRST(&softc->work_queue);
 669
 670                 /* Initiate a transaction using the descr and supplied CCB */
 671                 error = targusermerge(softc, descr, start_ccb);
 672                 if (error == 0)
 673                         error = targsendccb(softc, start_ccb, descr);
 674                 if (error != 0) {
 675                         xpt_print(periph->path,
 676                             "targsendccb failed, err %d\n", error);
 677                         xpt_release_ccb(start_ccb);
 678                         suword(&descr->user_ccb->ccb_h.status,
 679                                CAM_REQ_CMP_ERR);
 680                         TAILQ_INSERT_TAIL(&softc->abort_queue, descr, tqe);
 681                         notify_user(softc);
 682                 }
 683
 684                 /* If we have more work to do, stay scheduled */
 685                 if (next_descr != NULL)
 686                         xpt_schedule(periph, next_descr->priority);
 687         }
 688 }
 689
 690 static int
 691 targusermerge(struct targ_softc *softc, struct targ_cmd_descr *descr,
 692               union ccb *ccb)
 693 {
 694         struct ccb_hdr *u_ccbh, *k_ccbh;
 695         size_t ccb_len;
 696         int error;
 697
 698         u_ccbh = &descr->user_ccb->ccb_h;
 699         k_ccbh = &ccb->ccb_h;
 700
 701         /*
 702          * There are some fields in the CCB header that need to be
 703          * preserved, the rest we get from the user ccb. (See xpt_merge_ccb)
 704          */
 705         xpt_setup_ccb(k_ccbh, softc->path, descr->priority);
 706         k_ccbh->retry_count = fuword32(&u_ccbh->retry_count);
 707         k_ccbh->func_code = descr->func_code;
 708         k_ccbh->flags = fuword32(&u_ccbh->flags);
 709         k_ccbh->timeout = fuword32(&u_ccbh->timeout);
 710         ccb_len = targccblen(k_ccbh->func_code) - sizeof(struct ccb_hdr);
 711         error = copyin(u_ccbh + 1, k_ccbh + 1, ccb_len);
 712         if (error != 0) {
 713                 k_ccbh->status = CAM_REQ_CMP_ERR;
 714                 return (error);
 715         }
 716
 717         /* Translate usermode abort_ccb pointer to its kernel counterpart */
 718         if (k_ccbh->func_code == XPT_ABORT) {
 719                 struct ccb_abort *cab;
 720                 struct ccb_hdr *ccb_h;
 721
 722                 cab = (struct ccb_abort *)ccb;
 723                 TAILQ_FOREACH(ccb_h, &softc->pending_ccb_queue,
 724                     periph_links.tqe) {
 725                         struct targ_cmd_descr *ab_descr;
 726
 727                         ab_descr = (struct targ_cmd_descr *)ccb_h->targ_descr;
 728                         if (ab_descr->user_ccb == cab->abort_ccb) {
 729                                 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
 730                                           ("Changing abort for %p to %p\n",
 731                                           cab->abort_ccb, ccb_h));
 732                                 cab->abort_ccb = (union ccb *)ccb_h;
 733                                 break;
 734                         }
 735                 }
 736                 /* CCB not found, set appropriate status */
 737                 if (ccb_h == NULL) {
 738                         k_ccbh->status = CAM_PATH_INVALID;
 739                         error = ESRCH;
 740                 }
 741         }
 742
 743         return (error);
 744 }
 745
 746 /* Build and send a kernel CCB formed from descr->user_ccb */
 747 static int
 748 targsendccb(struct targ_softc *softc, union ccb *ccb,
 749             struct targ_cmd_descr *descr)
 750 {
 751         struct cam_periph_map_info *mapinfo;
 752         struct ccb_hdr *ccb_h;
 753         int error;
 754
 755         ccb_h = &ccb->ccb_h;
 756         mapinfo = &descr->mapinfo;
 757         mapinfo->num_bufs_used = 0;
 758
 759         /*
 760          * There's no way for the user to have a completion
 761          * function, so we put our own completion function in here.
 762          * We also stash in a reference to our descriptor so targreturnccb()
 763          * can find our mapping info.
 764          */
 765         ccb_h->cbfcnp = targdone;
 766         ccb_h->targ_descr = descr;
 767
 768         /*
 769          * We only attempt to map the user memory into kernel space
 770          * if they haven't passed in a physical memory pointer,
 771          * and if there is actually an I/O operation to perform.
 772          * Right now cam_periph_mapmem() only supports SCSI and device
 773          * match CCBs.  For the SCSI CCBs, we only pass the CCB in if
 774          * there's actually data to map.  cam_periph_mapmem() will do the
 775          * right thing, even if there isn't data to map, but since CCBs
 776          * without data are a reasonably common occurance (e.g. test unit
 777          * ready), it will save a few cycles if we check for it here.
 778          */
 779         if (((ccb_h->flags & CAM_DATA_PHYS) == 0)
 780          && (((ccb_h->func_code == XPT_CONT_TARGET_IO)
 781             && ((ccb_h->flags & CAM_DIR_MASK) != CAM_DIR_NONE))
 782           || (ccb_h->func_code == XPT_DEV_MATCH))) {
 783
 784                 error = cam_periph_mapmem(ccb, mapinfo);
 785
 786                 /*
 787                  * cam_periph_mapmem returned an error, we can't continue.
 788                  * Return the error to the user.
 789                  */
 790                 if (error) {
 791                         ccb_h->status = CAM_REQ_CMP_ERR;
 792                         mapinfo->num_bufs_used = 0;
 793                         return (error);
 794                 }
 795         }
 796
 797         /*
 798          * Once queued on the pending CCB list, this CCB will be protected
 799          * by our error recovery handler.
 800          */
 801         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("sendccb %p\n", ccb));
 802         if (XPT_FC_IS_QUEUED(ccb)) {
 803                 TAILQ_INSERT_TAIL(&softc->pending_ccb_queue, ccb_h,
 804                                   periph_links.tqe);
 805         }
 806         xpt_action(ccb);
 807
 808         return (0);
 809 }
 810
 811 /* Completion routine for CCBs (called at splsoftcam) */
 812 static void
 813 targdone(struct cam_periph *periph, union ccb *done_ccb)
 814 {
 815         struct targ_softc *softc;
 816         cam_status status;
 817
 818         CAM_DEBUG(periph->path, CAM_DEBUG_PERIPH, ("targdone %p\n", done_ccb));
 819         softc = (struct targ_softc *)periph->softc;
 820         TAILQ_REMOVE(&softc->pending_ccb_queue, &done_ccb->ccb_h,
 821                      periph_links.tqe);
 822         status = done_ccb->ccb_h.status & CAM_STATUS_MASK;
 823
 824         /* If we're no longer enabled, throw away CCB */
 825         if ((softc->state & TARG_STATE_LUN_ENABLED) == 0) {
 826                 targfreeccb(softc, done_ccb);
 827                 return;
 828         }
 829         /* abort_all_pending() waits for pending queue to be empty */
 830         if (TAILQ_EMPTY(&softc->pending_ccb_queue))
 831                 wakeup(&softc->pending_ccb_queue);
 832
 833         switch (done_ccb->ccb_h.func_code) {
 834         /* All FC_*_QUEUED CCBs go back to userland */
 835         case XPT_IMMED_NOTIFY:
 836         case XPT_ACCEPT_TARGET_IO:
 837         case XPT_CONT_TARGET_IO:
 838                 TAILQ_INSERT_TAIL(&softc->user_ccb_queue, &done_ccb->ccb_h,
 839                                   periph_links.tqe);
 840                 cam_periph_unlock(softc->periph);
 841                 notify_user(softc);
 842                 cam_periph_lock(softc->periph);
 843                 break;
 844         default:
 845                 panic("targdone: impossible xpt opcode %#x",
 846                       done_ccb->ccb_h.func_code);
 847                 /* NOTREACHED */
 848         }
 849 }
 850
 851 /* Return CCBs to the user from the user queue and abort queue */
 852 static int
 853 targread(struct cdev *dev, struct uio *uio, int ioflag)
 854 {
 855         struct descr_queue      *abort_queue;
 856         struct targ_cmd_descr   *user_descr;
 857         struct targ_softc       *softc;
 858         struct ccb_queue  *user_queue;
 859         struct ccb_hdr    *ccb_h;
 860         union  ccb        *user_ccb;
 861         int                read_len, error;
 862
 863         error = 0;
 864         read_len = 0;
 865         softc = (struct targ_softc *)dev->si_drv1;
 866         user_queue = &softc->user_ccb_queue;
 867         abort_queue = &softc->abort_queue;
 868         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targread\n"));
 869
 870         /* If no data is available, wait or return immediately */
 871         cam_periph_lock(softc->periph);
 872         ccb_h = TAILQ_FIRST(user_queue);
 873         user_descr = TAILQ_FIRST(abort_queue);
 874         while (ccb_h == NULL && user_descr == NULL) {
 875                 if ((ioflag & IO_NDELAY) == 0) {
 876                         error = msleep(user_queue, softc->periph->sim->mtx,
 877                             PRIBIO | PCATCH, "targrd", 0);
 878                         ccb_h = TAILQ_FIRST(user_queue);
 879                         user_descr = TAILQ_FIRST(abort_queue);
 880                         if (error != 0) {
 881                                 if (error == ERESTART) {
 882                                         continue;
 883                                 } else {
 884                                         goto read_fail;
 885                                 }
 886                         }
 887                 } else {
 888                         cam_periph_unlock(softc->periph);
 889                         return (EAGAIN);
 890                 }
 891         }
 892
 893         /* Data is available so fill the user's buffer */
 894         while (ccb_h != NULL) {
 895                 struct targ_cmd_descr *descr;
 896
 897                 if (uio->uio_resid < sizeof(user_ccb))
 898                         break;
 899                 TAILQ_REMOVE(user_queue, ccb_h, periph_links.tqe);
 900                 descr = (struct targ_cmd_descr *)ccb_h->targ_descr;
 901                 user_ccb = descr->user_ccb;
 902                 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
 903                           ("targread ccb %p (%p)\n", ccb_h, user_ccb));
 904                 error = targreturnccb(softc, (union ccb *)ccb_h);
 905                 if (error != 0)
 906                         goto read_fail;
 907                 cam_periph_unlock(softc->periph);
 908                 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio);
 909                 cam_periph_lock(softc->periph);
 910                 if (error != 0)
 911                         goto read_fail;
 912                 read_len += sizeof(user_ccb);
 913
 914                 ccb_h = TAILQ_FIRST(user_queue);
 915         }
 916
 917         /* Flush out any aborted descriptors */
 918         while (user_descr != NULL) {
 919                 if (uio->uio_resid < sizeof(user_ccb))
 920                         break;
 921                 TAILQ_REMOVE(abort_queue, user_descr, tqe);
 922                 user_ccb = user_descr->user_ccb;
 923                 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
 924                           ("targread aborted descr %p (%p)\n",
 925                           user_descr, user_ccb));
 926                 suword(&user_ccb->ccb_h.status, CAM_REQ_ABORTED);
 927                 cam_periph_unlock(softc->periph);
 928                 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio);
 929                 cam_periph_lock(softc->periph);
 930                 if (error != 0)
 931                         goto read_fail;
 932                 read_len += sizeof(user_ccb);
 933
 934                 user_descr = TAILQ_FIRST(abort_queue);
 935         }
 936
 937         /*
 938          * If we've successfully read some amount of data, don't report an
 939          * error.  If the error is persistent, it will be reported on the
 940          * next read().
 941          */
 942         if (read_len == 0 && uio->uio_resid != 0)
 943                 error = ENOSPC;
 944
 945 read_fail:
 946         cam_periph_unlock(softc->periph);
 947         return (error);
 948 }
 949
 950 /* Copy completed ccb back to the user */
 951 static int
 952 targreturnccb(struct targ_softc *softc, union ccb *ccb)
 953 {
 954         struct targ_cmd_descr *descr;
 955         struct ccb_hdr *u_ccbh;
 956         size_t ccb_len;
 957         int error;
 958
 959         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targreturnccb %p\n", ccb));
 960         descr = (struct targ_cmd_descr *)ccb->ccb_h.targ_descr;
 961         u_ccbh = &descr->user_ccb->ccb_h;
 962
 963         /* Copy out the central portion of the ccb_hdr */
 964         copyout(&ccb->ccb_h.retry_count, &u_ccbh->retry_count,
 965                 offsetof(struct ccb_hdr, periph_priv) -
 966                 offsetof(struct ccb_hdr, retry_count));
 967
 968         /* Copy out the rest of the ccb (after the ccb_hdr) */
 969         ccb_len = targccblen(ccb->ccb_h.func_code) - sizeof(struct ccb_hdr);
 970         if (descr->mapinfo.num_bufs_used != 0)
 971                 cam_periph_unmapmem(ccb, &descr->mapinfo);
 972         error = copyout(&ccb->ccb_h + 1, u_ccbh + 1, ccb_len);
 973         if (error != 0) {
 974                 xpt_print(softc->path,
 975                     "targreturnccb - CCB copyout failed (%d)\n", error);
 976         }
 977         /* Free CCB or send back to devq. */
 978         targfreeccb(softc, ccb);
 979
 980         return (error);
 981 }
 982
 983 static union ccb *
 984 targgetccb(struct targ_softc *softc, xpt_opcode type, int priority)
 985 {
 986         union ccb *ccb;
 987         int ccb_len;
 988
 989         ccb_len = targccblen(type);
 990         ccb = malloc(ccb_len, M_TARG, M_NOWAIT);
 991         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("getccb %p\n", ccb));
 992         if (ccb == NULL) {
 993                 return (ccb);
 994         }
 995         xpt_setup_ccb(&ccb->ccb_h, softc->path, priority);
 996         ccb->ccb_h.func_code = type;
 997         ccb->ccb_h.cbfcnp = targdone;
 998         ccb->ccb_h.targ_descr = targgetdescr(softc);
 999         if (ccb->ccb_h.targ_descr == NULL) {
1000                 free (ccb, M_TARG);
1001                 ccb = NULL;
1002         }
1003         return (ccb);
1004 }
1005
1006 static void
1007 targfreeccb(struct targ_softc *softc, union ccb *ccb)
1008 {
1009         CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, ("targfreeccb descr %p and\n",
1010                         ccb->ccb_h.targ_descr));
1011         free(ccb->ccb_h.targ_descr, M_TARG);
1012
1013         switch (ccb->ccb_h.func_code) {
1014         case XPT_ACCEPT_TARGET_IO:
1015         case XPT_IMMED_NOTIFY:
1016                 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, ("freeing ccb %p\n", ccb));
1017                 free(ccb, M_TARG);
1018                 break;
1019         default:
1020                 /* Send back CCB if we got it from the periph */
1021                 if (XPT_FC_IS_QUEUED(ccb)) {
1022                         CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH,
1023                                         ("returning queued ccb %p\n", ccb));
1024                         xpt_release_ccb(ccb);
1025                 } else {
1026                         CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH,
1027                                         ("freeing ccb %p\n", ccb));
1028                         free(ccb, M_TARG);
1029                 }
1030                 break;
1031         }
1032 }
1033
1034 static struct targ_cmd_descr *
1035 targgetdescr(struct targ_softc *softc)
1036 {
1037         struct targ_cmd_descr *descr;
1038
1039         descr = malloc(sizeof(*descr), M_TARG,
1040                M_NOWAIT);
1041         if (descr) {
1042                 descr->mapinfo.num_bufs_used = 0;
1043         }
1044         return (descr);
1045 }
1046
1047 static void
1048 targinit(void)
1049 {
1050         EVENTHANDLER_REGISTER(dev_clone, targclone, 0, 1000);
1051 }
1052
1053 static void
1054 targclone(void *arg, struct ucred *cred, char *name, int namelen,
1055     struct cdev **dev)
1056 {
1057         int u;
1058
1059         if (*dev != NULL)
1060                 return;
1061         if (dev_stdclone(name, NULL, "targ", &u) != 1)
1062                 return;
1063         *dev = make_dev(&targ_cdevsw, u, UID_ROOT, GID_WHEEL,
1064                         0600, "targ%d", u);
1065         dev_ref(*dev);
1066         (*dev)->si_flags |= SI_CHEAPCLONE;
1067 }
1068
1069 static void
1070 targasync(void *callback_arg, u_int32_t code, struct cam_path *path, void *arg)
1071 {
1072         /* All events are handled in usermode by INOTs */
1073         panic("targasync() called, should be an INOT instead");
1074 }
1075
1076 /* Cancel all pending requests and CCBs awaiting work. */
1077 static void
1078 abort_all_pending(struct targ_softc *softc)
1079 {
1080         struct targ_cmd_descr   *descr;
1081         struct ccb_abort         cab;
1082         struct ccb_hdr          *ccb_h;
1083         struct cam_sim          *sim;
1084
1085         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("abort_all_pending\n"));
1086
1087         /* First abort the descriptors awaiting resources */
1088         while ((descr = TAILQ_FIRST(&softc->work_queue)) != NULL) {
1089                 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
1090                           ("Aborting descr from workq %p\n", descr));
1091                 TAILQ_REMOVE(&softc->work_queue, descr, tqe);
1092                 TAILQ_INSERT_TAIL(&softc->abort_queue, descr, tqe);
1093         }
1094
1095         /*
1096          * Then abort all pending CCBs.
1097          * targdone() will return the aborted CCB via user_ccb_queue
1098          */
1099         xpt_setup_ccb(&cab.ccb_h, softc->path, CAM_PRIORITY_NORMAL);
1100         cab.ccb_h.func_code = XPT_ABORT;
1101         cab.ccb_h.status = CAM_REQ_CMP_ERR;
1102         TAILQ_FOREACH(ccb_h, &softc->pending_ccb_queue, periph_links.tqe) {
1103                 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
1104                           ("Aborting pending CCB %p\n", ccb_h));
1105                 cab.abort_ccb = (union ccb *)ccb_h;
1106                 xpt_action((union ccb *)&cab);
1107                 if (cab.ccb_h.status != CAM_REQ_CMP) {
1108                         xpt_print(cab.ccb_h.path,
1109                             "Unable to abort CCB, status %#x\n",
1110                             cab.ccb_h.status);
1111                 }
1112         }
1113
1114         /* If we aborted at least one pending CCB ok, wait for it. */
1115         if (cab.ccb_h.status == CAM_REQ_CMP) {
1116                 sim = xpt_path_sim(softc->path);
1117                 msleep(&softc->pending_ccb_queue, sim->mtx,
1118                        PRIBIO | PCATCH, "tgabrt", 0);
1119         }
1120
1121         /* If we aborted anything from the work queue, wakeup user. */
1122         if (!TAILQ_EMPTY(&softc->user_ccb_queue)
1123          || !TAILQ_EMPTY(&softc->abort_queue)) {
1124                 cam_periph_unlock(softc->periph);
1125                 notify_user(softc);
1126                 cam_periph_lock(softc->periph);
1127         }
1128 }
1129
1130 /* Notify the user that data is ready */
1131 static void
1132 notify_user(struct targ_softc *softc)
1133 {
1134         /*
1135          * Notify users sleeping via poll(), kqueue(), and
1136          * blocking read().
1137          */
1138         selwakeuppri(&softc->read_select, PRIBIO);
1139         KNOTE_UNLOCKED(&softc->read_select.si_note, 0);
1140         wakeup(&softc->user_ccb_queue);
1141 }
1142
1143 /* Convert CAM status to errno values */
1144 static int
1145 targcamstatus(cam_status status)
1146 {
1147         switch (status & CAM_STATUS_MASK) {
1148         case CAM_REQ_CMP:       /* CCB request completed without error */
1149                 return (0);
1150         case CAM_REQ_INPROG:    /* CCB request is in progress */
1151                 return (EINPROGRESS);
1152         case CAM_REQ_CMP_ERR:   /* CCB request completed with an error */
1153                 return (EIO);
1154         case CAM_PROVIDE_FAIL:  /* Unable to provide requested capability */
1155                 return (ENOTTY);
1156         case CAM_FUNC_NOTAVAIL: /* The requested function is not available */
1157                 return (ENOTSUP);
1158         case CAM_LUN_ALRDY_ENA: /* LUN is already enabled for target mode */
1159                 return (EADDRINUSE);
1160         case CAM_PATH_INVALID:  /* Supplied Path ID is invalid */
1161         case CAM_DEV_NOT_THERE: /* SCSI Device Not Installed/there */
1162                 return (ENOENT);
1163         case CAM_REQ_ABORTED:   /* CCB request aborted by the host */
1164                 return (ECANCELED);
1165         case CAM_CMD_TIMEOUT:   /* Command timeout */
1166                 return (ETIMEDOUT);
1167         case CAM_REQUEUE_REQ:   /* Requeue to preserve transaction ordering */
1168                 return (EAGAIN);
1169         case CAM_REQ_INVALID:   /* CCB request was invalid */
1170                 return (EINVAL);
1171         case CAM_RESRC_UNAVAIL: /* Resource Unavailable */
1172                 return (ENOMEM);
1173         case CAM_BUSY:          /* CAM subsystem is busy */
1174         case CAM_UA_ABORT:      /* Unable to abort CCB request */
1175                 return (EBUSY);
1176         default:
1177                 return (ENXIO);
1178         }
1179 }
1180
1181 static size_t
1182 targccblen(xpt_opcode func_code)
1183 {
1184         int len;
1185
1186         /* Codes we expect to see as a target */
1187         switch (func_code) {
1188         case XPT_CONT_TARGET_IO:
1189         case XPT_SCSI_IO:
1190                 len = sizeof(struct ccb_scsiio);
1191                 break;
1192         case XPT_ACCEPT_TARGET_IO:
1193                 len = sizeof(struct ccb_accept_tio);
1194                 break;
1195         case XPT_IMMED_NOTIFY:
1196                 len = sizeof(struct ccb_immed_notify);
1197                 break;
1198         case XPT_REL_SIMQ:
1199                 len = sizeof(struct ccb_relsim);
1200                 break;
1201         case XPT_PATH_INQ:
1202                 len = sizeof(struct ccb_pathinq);
1203                 break;
1204         case XPT_DEBUG:
1205                 len = sizeof(struct ccb_debug);
1206                 break;
1207         case XPT_ABORT:
1208                 len = sizeof(struct ccb_abort);
1209                 break;
1210         case XPT_EN_LUN:
1211                 len = sizeof(struct ccb_en_lun);
1212                 break;
1213         default:
1214                 len = sizeof(union ccb);
1215                 break;
1216         }
1217
1218         return (len);
1219 }
1220
1221 /*
1222  * work around to destroy targ device
1223  * outside of targclose
1224  */
1225 static void
1226 targdestroy(void *dev)
1227 {
1228         struct cdev *device = (struct cdev *)dev;
1229         struct targ_softc *softc = (struct targ_softc *)device->si_drv1;
1230
1231 #if 0
1232         callout_stop(&softc->destroy_dev_callout);
1233 #endif
1234
1235         mtx_unlock(&softc->destroy_mtx);
1236         mtx_destroy(&softc->destroy_mtx);
1237         free(softc, M_TARG);
1238         device->si_drv1 = 0;
1239         destroy_dev(device);
1240         printf("%s: destroyed dev\n", __func__);
1241 }