sys/bus/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  * $FreeBSD: src/sys/cam/scsi/scsi_target.c,v 1.22.2.7 2003/02/18 22:07:10 njl Exp $
  30  * $DragonFly: src/sys/bus/cam/scsi/scsi_target.c,v 1.20 2008/07/18 00:07:23 dillon Exp $
  31  */
  32
  33 #include <sys/param.h>
  34 #include <sys/systm.h>
  35 #include <sys/kernel.h>
  36 #include <sys/conf.h>
  37 #include <sys/device.h>
  38 #include <sys/malloc.h>
  39 #include <sys/poll.h>
  40 #include <sys/vnode.h>
  41 #include <sys/devicestat.h>
  42 #include <sys/thread2.h>
  43
  44 #include "../cam.h"
  45 #include "../cam_ccb.h"
  46 #include "../cam_periph.h"
  47 #include "../cam_xpt_periph.h"
  48 #include "../cam_sim.h"
  49 #include "scsi_targetio.h"
  50
  51 /* Transaction information attached to each CCB sent by the user */
  52 struct targ_cmd_descr {
  53         struct cam_periph_map_info  mapinfo;
  54         TAILQ_ENTRY(targ_cmd_descr) tqe;
  55         union ccb *user_ccb;
  56         int        priority;
  57         int        func_code;
  58 };
  59
  60 /* Offset into the private CCB area for storing our descriptor */
  61 #define targ_descr      periph_priv.entries[1].ptr
  62
  63 TAILQ_HEAD(descr_queue, targ_cmd_descr);
  64
  65 typedef enum {
  66         TARG_STATE_RESV         = 0x00, /* Invalid state */
  67         TARG_STATE_OPENED       = 0x01, /* Device opened, softc initialized */
  68         TARG_STATE_LUN_ENABLED  = 0x02  /* Device enabled for a path */
  69 } targ_state;
  70
  71 /* Per-instance device software context */
  72 struct targ_softc {
  73         /* CCBs (CTIOs, ATIOs, INOTs) pending on the controller */
  74         struct ccb_queue         pending_ccb_queue;
  75
  76         /* Command descriptors awaiting CTIO resources from the XPT */
  77         struct descr_queue       work_queue;
  78
  79         /* Command descriptors that have been aborted back to the user. */
  80         struct descr_queue       abort_queue;
  81
  82         /*
  83          * Queue of CCBs that have been copied out to userland, but our
  84          * userland daemon has not yet seen.
  85          */
  86         struct ccb_queue         user_ccb_queue;
  87
  88         struct cam_periph       *periph;
  89         struct cam_path         *path;
  90         targ_state               state;
  91         struct selinfo           read_select;
  92         struct devstat           device_stats;
  93 };
  94
  95 static d_open_t         targopen;
  96 static d_close_t        targclose;
  97 static d_read_t         targread;
  98 static d_write_t        targwrite;
  99 static d_ioctl_t        targioctl;
 100 static d_poll_t         targpoll;
 101 static d_kqfilter_t     targkqfilter;
 102 static void             targreadfiltdetach(struct knote *kn);
 103 static int              targreadfilt(struct knote *kn, long hint);
 104 static struct filterops targread_filtops =
 105         { 1, NULL, targreadfiltdetach, targreadfilt };
 106
 107 #define TARG_CDEV_MAJOR 65
 108 static struct dev_ops targ_ops = {
 109         { "targ", TARG_CDEV_MAJOR, D_KQFILTER },
 110         .d_open = targopen,
 111         .d_close = targclose,
 112         .d_read = targread,
 113         .d_write = targwrite,
 114         .d_ioctl = targioctl,
 115         .d_poll = targpoll,
 116         .d_kqfilter = targkqfilter
 117 };
 118
 119 static cam_status       targendislun(struct cam_path *path, int enable,
 120                                      int grp6_len, int grp7_len);
 121 static cam_status       targenable(struct targ_softc *softc,
 122                                    struct cam_path *path,
 123                                    int grp6_len, int grp7_len);
 124 static cam_status       targdisable(struct targ_softc *softc);
 125 static periph_ctor_t    targctor;
 126 static periph_dtor_t    targdtor;
 127 static periph_start_t   targstart;
 128 static int              targusermerge(struct targ_softc *softc,
 129                                       struct targ_cmd_descr *descr,
 130                                       union ccb *ccb);
 131 static int              targsendccb(struct targ_softc *softc, union ccb *ccb,
 132                                     struct targ_cmd_descr *descr);
 133 static void             targdone(struct cam_periph *periph,
 134                                  union  ccb *done_ccb);
 135 static int              targreturnccb(struct targ_softc *softc,
 136                                       union  ccb *ccb);
 137 static union ccb *      targgetccb(struct targ_softc *softc, xpt_opcode type,
 138                                    int priority);
 139 static void             targfreeccb(struct targ_softc *softc, union ccb *ccb);
 140 static struct targ_cmd_descr *
 141                         targgetdescr(struct targ_softc *softc);
 142 static periph_init_t    targinit;
 143 static void             targasync(void *callback_arg, u_int32_t code,
 144                                   struct cam_path *path, void *arg);
 145 static void             abort_all_pending(struct targ_softc *softc);
 146 static void             notify_user(struct targ_softc *softc);
 147 static int              targcamstatus(cam_status status);
 148 static size_t           targccblen(xpt_opcode func_code);
 149
 150 static struct periph_driver targdriver =
 151 {
 152         targinit, "targ",
 153         TAILQ_HEAD_INITIALIZER(targdriver.units), /* generation */ 0
 154 };
 155 PERIPHDRIVER_DECLARE(targ, targdriver);
 156
 157 static MALLOC_DEFINE(M_TARG, "TARG", "TARG data");
 158
 159 /*
 160  * Create softc and initialize it. Only one proc can open each targ device.
 161  * There is no locking here because a periph doesn't get created until an
 162  * ioctl is issued to do so, and that can't happen until this method returns.
 163  */
 164 static int
 165 targopen(struct dev_open_args *ap)
 166 {
 167         cdev_t dev = ap->a_head.a_dev;
 168         struct targ_softc *softc;
 169
 170         if (dev->si_drv1 != 0) {
 171                 return (EBUSY);
 172         }
 173
 174         /* Mark device busy before any potentially blocking operations */
 175         dev->si_drv1 = (void *)~0;
 176         reference_dev(dev);             /* save ref for later destroy_dev() */
 177
 178         /* Create the targ device, allocate its softc, initialize it */
 179         make_dev(&targ_ops, minor(dev), UID_ROOT, GID_WHEEL, 0600,
 180                          "targ%d", lminor(dev));
 181         MALLOC(softc, struct targ_softc *, sizeof(*softc), M_TARG,
 182                M_INTWAIT | M_ZERO);
 183         dev->si_drv1 = softc;
 184         softc->state = TARG_STATE_OPENED;
 185         softc->periph = NULL;
 186         softc->path = NULL;
 187
 188         TAILQ_INIT(&softc->pending_ccb_queue);
 189         TAILQ_INIT(&softc->work_queue);
 190         TAILQ_INIT(&softc->abort_queue);
 191         TAILQ_INIT(&softc->user_ccb_queue);
 192
 193         return (0);
 194 }
 195
 196 /* Disable LUN if enabled and teardown softc */
 197 static int
 198 targclose(struct dev_close_args *ap)
 199 {
 200         cdev_t dev = ap->a_head.a_dev;
 201         struct targ_softc     *softc;
 202         struct cam_periph     *periph;
 203         int    error;
 204
 205         softc = (struct targ_softc *)dev->si_drv1;
 206         if ((softc->periph == NULL) ||
 207             (softc->state & TARG_STATE_LUN_ENABLED) == 0) {
 208                 destroy_dev(dev);
 209                 FREE(softc, M_TARG);
 210                 return (0);
 211         }
 212
 213         /*
 214          * Acquire a hold on the periph so that it doesn't go away before
 215          * we are ready at the end of the function.
 216          */
 217         periph = softc->periph;
 218         cam_periph_acquire(periph);
 219         cam_periph_lock(periph);
 220         error = targdisable(softc);
 221         if (error == CAM_REQ_CMP) {
 222                 dev->si_drv1 = 0;
 223                 if (softc->periph != NULL) {
 224                         cam_periph_invalidate(softc->periph);
 225                         softc->periph = NULL;
 226                 }
 227                 destroy_dev(dev);       /* eats the open ref */
 228                 FREE(softc, M_TARG);
 229         } else {
 230                 release_dev(dev);
 231         }
 232         cam_periph_unlock(periph);
 233         cam_periph_release(periph);
 234
 235         return (error);
 236 }
 237
 238 /* Enable/disable LUNs, set debugging level */
 239 static int
 240 targioctl(struct dev_ioctl_args *ap)
 241 {
 242         struct targ_softc *softc;
 243         cam_status         status;
 244
 245         softc = (struct targ_softc *)ap->a_head.a_dev->si_drv1;
 246
 247         switch (ap->a_cmd) {
 248         case TARGIOCENABLE:
 249         {
 250                 struct ioc_enable_lun   *new_lun;
 251                 struct cam_path         *path;
 252                 struct cam_sim          *sim;
 253
 254                 new_lun = (struct ioc_enable_lun *)ap->a_data;
 255                 status = xpt_create_path_unlocked(&path, /*periph*/NULL,
 256                                                   new_lun->path_id,
 257                                                   new_lun->target_id,
 258                                                   new_lun->lun_id);
 259                 if (status != CAM_REQ_CMP) {
 260                         kprintf("Couldn't create path, status %#x\n", status);
 261                         break;
 262                 }
 263                 sim = xpt_path_sim(path);
 264                 CAM_SIM_LOCK(sim);
 265                 status = targenable(softc, path, new_lun->grp6_len,
 266                                     new_lun->grp7_len);
 267                 xpt_free_path(path);
 268                 CAM_SIM_UNLOCK(sim);
 269                 break;
 270         }
 271         case TARGIOCDISABLE:
 272                 if (softc->periph == NULL) {
 273                         status = CAM_DEV_NOT_THERE;
 274                         break;
 275                 }
 276                 cam_periph_lock(softc->periph);
 277                 status = targdisable(softc);
 278                 cam_periph_unlock(softc->periph);
 279                 break;
 280         case TARGIOCDEBUG:
 281         {
 282 #ifdef  CAMDEBUG
 283                 struct ccb_debug cdbg;
 284
 285                 /* If no periph available, disallow debugging changes */
 286                 if ((softc->state & TARG_STATE_LUN_ENABLED) == 0) {
 287                         status = CAM_DEV_NOT_THERE;
 288                         break;
 289                 }
 290                 bzero(&cdbg, sizeof cdbg);
 291                 if (*((int *)ap->a_data) != 0)
 292                         cdbg.flags = CAM_DEBUG_PERIPH;
 293                 else
 294                         cdbg.flags = CAM_DEBUG_NONE;
 295                 cam_periph_lock(softc->periph);
 296                 xpt_setup_ccb(&cdbg.ccb_h, softc->path, /*priority*/0);
 297                 cdbg.ccb_h.func_code = XPT_DEBUG;
 298                 cdbg.ccb_h.cbfcnp = targdone;
 299
 300                 xpt_action((union ccb *)&cdbg);
 301                 cam_periph_unlock(softc->periph);
 302                 status = cdbg.ccb_h.status & CAM_STATUS_MASK;
 303 #else
 304                 status = CAM_FUNC_NOTAVAIL;
 305 #endif
 306                 break;
 307         }
 308         default:
 309                 status = CAM_PROVIDE_FAIL;
 310                 break;
 311         }
 312
 313         return (targcamstatus(status));
 314 }
 315
 316 /* Writes are always ready, reads wait for user_ccb_queue or abort_queue */
 317 static int
 318 targpoll(struct dev_poll_args *ap)
 319 {
 320         struct targ_softc *softc;
 321         int     revents;
 322
 323         softc = (struct targ_softc *)ap->a_head.a_dev->si_drv1;
 324
 325         /* Poll for write() is always ok. */
 326         revents = ap->a_events & (POLLOUT | POLLWRNORM);
 327         if ((ap->a_events & (POLLIN | POLLRDNORM)) != 0) {
 328                 /* Poll for read() depends on user and abort queues. */
 329                 cam_periph_lock(softc->periph);
 330                 if (!TAILQ_EMPTY(&softc->user_ccb_queue) ||
 331                     !TAILQ_EMPTY(&softc->abort_queue)) {
 332                         revents |= ap->a_events & (POLLIN | POLLRDNORM);
 333                 }
 334                 cam_periph_unlock(softc->periph);
 335                 /* Only sleep if the user didn't poll for write. */
 336                 if (revents == 0)
 337                         selrecord(curthread, &softc->read_select);
 338         }
 339         ap->a_events = revents;
 340         return (0);
 341 }
 342
 343 static int
 344 targkqfilter(struct dev_kqfilter_args *ap)
 345 {
 346         struct  knote *kn = ap->a_kn;
 347         struct  targ_softc *softc;
 348
 349         softc = (struct targ_softc *)ap->a_head.a_dev->si_drv1;
 350         kn->kn_hook = (caddr_t)softc;
 351         kn->kn_fop = &targread_filtops;
 352         crit_enter();
 353         SLIST_INSERT_HEAD(&softc->read_select.si_note, kn, kn_selnext);
 354         crit_exit();
 355         return (0);
 356 }
 357
 358 static void
 359 targreadfiltdetach(struct knote *kn)
 360 {
 361         struct  targ_softc *softc;
 362
 363         softc = (struct targ_softc *)kn->kn_hook;
 364         crit_enter();
 365         SLIST_REMOVE(&softc->read_select.si_note, kn, knote, kn_selnext);
 366         crit_exit();
 367 }
 368
 369 /* Notify the user's kqueue when the user queue or abort queue gets a CCB */
 370 static int
 371 targreadfilt(struct knote *kn, long hint)
 372 {
 373         struct targ_softc *softc;
 374         int     retval;
 375
 376         softc = (struct targ_softc *)kn->kn_hook;
 377         cam_periph_lock(softc->periph);
 378         retval = !TAILQ_EMPTY(&softc->user_ccb_queue) ||
 379                  !TAILQ_EMPTY(&softc->abort_queue);
 380         cam_periph_unlock(softc->periph);
 381         return (retval);
 382 }
 383
 384 /* Send the HBA the enable/disable message */
 385 static cam_status
 386 targendislun(struct cam_path *path, int enable, int grp6_len, int grp7_len)
 387 {
 388         struct ccb_en_lun en_ccb;
 389         cam_status        status;
 390
 391         /* Tell the lun to begin answering selects */
 392         xpt_setup_ccb(&en_ccb.ccb_h, path, /*priority*/1);
 393         en_ccb.ccb_h.func_code = XPT_EN_LUN;
 394         /* Don't need support for any vendor specific commands */
 395         en_ccb.grp6_len = grp6_len;
 396         en_ccb.grp7_len = grp7_len;
 397         en_ccb.enable = enable ? 1 : 0;
 398         xpt_action((union ccb *)&en_ccb);
 399         status = en_ccb.ccb_h.status & CAM_STATUS_MASK;
 400         if (status != CAM_REQ_CMP) {
 401                 xpt_print(path, "%sable lun CCB rejected, status %#x\n",
 402                     enable ? "en" : "dis", status);
 403         }
 404         return (status);
 405 }
 406
 407 /* Enable target mode on a LUN, given its path */
 408 static cam_status
 409 targenable(struct targ_softc *softc, struct cam_path *path, int grp6_len,
 410            int grp7_len)
 411 {
 412         struct cam_periph *periph;
 413         struct ccb_pathinq cpi;
 414         cam_status         status;
 415
 416         if ((softc->state & TARG_STATE_LUN_ENABLED) != 0)
 417                 return (CAM_LUN_ALRDY_ENA);
 418
 419         /* Make sure SIM supports target mode */
 420         xpt_setup_ccb(&cpi.ccb_h, path, /*priority*/1);
 421         cpi.ccb_h.func_code = XPT_PATH_INQ;
 422         xpt_action((union ccb *)&cpi);
 423         status = cpi.ccb_h.status & CAM_STATUS_MASK;
 424         if (status != CAM_REQ_CMP) {
 425                 kprintf("pathinq failed, status %#x\n", status);
 426                 goto enable_fail;
 427         }
 428         if ((cpi.target_sprt & PIT_PROCESSOR) == 0) {
 429                 kprintf("controller does not support target mode\n");
 430                 status = CAM_FUNC_NOTAVAIL;
 431                 goto enable_fail;
 432         }
 433
 434         /* Destroy any periph on our path if it is disabled */
 435         periph = cam_periph_find(path, "targ");
 436         if (periph != NULL) {
 437                 struct targ_softc *del_softc;
 438
 439                 del_softc = (struct targ_softc *)periph->softc;
 440                 if ((del_softc->state & TARG_STATE_LUN_ENABLED) == 0) {
 441                         cam_periph_invalidate(del_softc->periph);
 442                         del_softc->periph = NULL;
 443                 } else {
 444                         kprintf("Requested path still in use by targ%d\n",
 445                                periph->unit_number);
 446                         status = CAM_LUN_ALRDY_ENA;
 447                         goto enable_fail;
 448                 }
 449         }
 450
 451         /* Create a periph instance attached to this path */
 452         status = cam_periph_alloc(targctor, NULL, targdtor, targstart,
 453                         "targ", CAM_PERIPH_BIO, path, targasync, 0, softc);
 454         if (status != CAM_REQ_CMP) {
 455                 kprintf("cam_periph_alloc failed, status %#x\n", status);
 456                 goto enable_fail;
 457         }
 458
 459         /* Ensure that the periph now exists. */
 460         if (cam_periph_find(path, "targ") == NULL) {
 461                 panic("targenable: succeeded but no periph?");
 462                 /* NOTREACHED */
 463         }
 464
 465         /* Send the enable lun message */
 466         status = targendislun(path, /*enable*/1, grp6_len, grp7_len);
 467         if (status != CAM_REQ_CMP) {
 468                 kprintf("enable lun failed, status %#x\n", status);
 469                 goto enable_fail;
 470         }
 471         softc->state |= TARG_STATE_LUN_ENABLED;
 472
 473 enable_fail:
 474         return (status);
 475 }
 476
 477 /* Disable this softc's target instance if enabled */
 478 static cam_status
 479 targdisable(struct targ_softc *softc)
 480 {
 481         cam_status status;
 482
 483         if ((softc->state & TARG_STATE_LUN_ENABLED) == 0)
 484                 return (CAM_REQ_CMP);
 485
 486         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targdisable\n"));
 487
 488         /* Abort any ccbs pending on the controller */
 489         crit_enter();
 490         abort_all_pending(softc);
 491         crit_exit();
 492
 493         /* Disable this lun */
 494         status = targendislun(softc->path, /*enable*/0,
 495                               /*grp6_len*/0, /*grp7_len*/0);
 496         if (status == CAM_REQ_CMP)
 497                 softc->state &= ~TARG_STATE_LUN_ENABLED;
 498         else
 499                 kprintf("Disable lun failed, status %#x\n", status);
 500
 501         return (status);
 502 }
 503
 504 /* Initialize a periph (called from cam_periph_alloc) */
 505 static cam_status
 506 targctor(struct cam_periph *periph, void *arg)
 507 {
 508         struct targ_softc *softc;
 509
 510         /* Store pointer to softc for periph-driven routines */
 511         softc = (struct targ_softc *)arg;
 512         periph->softc = softc;
 513         softc->periph = periph;
 514         softc->path = periph->path;
 515         return (CAM_REQ_CMP);
 516 }
 517
 518 static void
 519 targdtor(struct cam_periph *periph)
 520 {
 521         struct targ_softc     *softc;
 522         struct ccb_hdr        *ccb_h;
 523         struct targ_cmd_descr *descr;
 524
 525         softc = (struct targ_softc *)periph->softc;
 526
 527         /*
 528          * targdisable() aborts CCBs back to the user and leaves them
 529          * on user_ccb_queue and abort_queue in case the user is still
 530          * interested in them.  We free them now.
 531          */
 532         while ((ccb_h = TAILQ_FIRST(&softc->user_ccb_queue)) != NULL) {
 533                 TAILQ_REMOVE(&softc->user_ccb_queue, ccb_h, periph_links.tqe);
 534                 targfreeccb(softc, (union ccb *)ccb_h);
 535         }
 536         while ((descr = TAILQ_FIRST(&softc->abort_queue)) != NULL) {
 537                 TAILQ_REMOVE(&softc->abort_queue, descr, tqe);
 538                 FREE(descr, M_TARG);
 539         }
 540
 541         softc->periph = NULL;
 542         softc->path = NULL;
 543         periph->softc = NULL;
 544 }
 545
 546 /* Receive CCBs from user mode proc and send them to the HBA */
 547 static int
 548 targwrite(struct dev_write_args *ap)
 549 {
 550         struct uio *uio = ap->a_uio;
 551         union ccb *user_ccb;
 552         struct targ_softc *softc;
 553         struct targ_cmd_descr *descr;
 554         int write_len, error;
 555         int func_code, priority;
 556
 557         softc = (struct targ_softc *)ap->a_head.a_dev->si_drv1;
 558         write_len = error = 0;
 559         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
 560                   ("write - uio_resid %d\n", uio->uio_resid));
 561         while (uio->uio_resid >= sizeof(user_ccb) && error == 0) {
 562                 union ccb *ccb;
 563
 564                 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio);
 565                 if (error != 0) {
 566                         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
 567                                   ("write - uiomove failed (%d)\n", error));
 568                         break;
 569                 }
 570                 priority = fuword(&user_ccb->ccb_h.pinfo.priority);
 571                 if (priority == -1) {
 572                         error = EINVAL;
 573                         break;
 574                 }
 575                 func_code = fuword(&user_ccb->ccb_h.func_code);
 576                 switch (func_code) {
 577                 case XPT_ACCEPT_TARGET_IO:
 578                 case XPT_IMMED_NOTIFY:
 579                         cam_periph_lock(softc->periph);
 580                         ccb = targgetccb(softc, func_code, priority);
 581                         descr = (struct targ_cmd_descr *)ccb->ccb_h.targ_descr;
 582                         descr->user_ccb = user_ccb;
 583                         descr->func_code = func_code;
 584                         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
 585                                   ("Sent ATIO/INOT (%p)\n", user_ccb));
 586                         xpt_action(ccb);
 587                         TAILQ_INSERT_TAIL(&softc->pending_ccb_queue,
 588                                           &ccb->ccb_h,
 589                                           periph_links.tqe);
 590                         cam_periph_unlock(softc->periph);
 591                         break;
 592                 default:
 593                         cam_periph_lock(softc->periph);
 594                         if ((func_code & XPT_FC_QUEUED) != 0) {
 595                                 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
 596                                           ("Sending queued ccb %#x (%p)\n",
 597                                           func_code, user_ccb));
 598                                 descr = targgetdescr(softc);
 599                                 descr->user_ccb = user_ccb;
 600                                 descr->priority = priority;
 601                                 descr->func_code = func_code;
 602                                 crit_enter();
 603                                 TAILQ_INSERT_TAIL(&softc->work_queue,
 604                                                   descr, tqe);
 605                                 crit_exit();
 606                                 xpt_schedule(softc->periph, priority);
 607                         } else {
 608                                 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
 609                                           ("Sending inline ccb %#x (%p)\n",
 610                                           func_code, user_ccb));
 611                                 ccb = targgetccb(softc, func_code, priority);
 612                                 descr = (struct targ_cmd_descr *)
 613                                          ccb->ccb_h.targ_descr;
 614                                 descr->user_ccb = user_ccb;
 615                                 descr->priority = priority;
 616                                 descr->func_code = func_code;
 617                                 if (targusermerge(softc, descr, ccb) != EFAULT)
 618                                         targsendccb(softc, ccb, descr);
 619                                 targreturnccb(softc, ccb);
 620                         }
 621                         cam_periph_unlock(softc->periph);
 622                         break;
 623                 }
 624                 write_len += sizeof(user_ccb);
 625         }
 626
 627         /*
 628          * If we've successfully taken in some amount of
 629          * data, return success for that data first.  If
 630          * an error is persistent, it will be reported
 631          * on the next write.
 632          */
 633         if (error != 0 && write_len == 0)
 634                 return (error);
 635         if (write_len == 0 && uio->uio_resid != 0)
 636                 return (ENOSPC);
 637         return (0);
 638 }
 639
 640 /* Process requests (descrs) via the periph-supplied CCBs */
 641 static void
 642 targstart(struct cam_periph *periph, union ccb *start_ccb)
 643 {
 644         struct targ_softc *softc;
 645         struct targ_cmd_descr *descr, *next_descr;
 646         int error;
 647
 648         softc = (struct targ_softc *)periph->softc;
 649         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targstart %p\n", start_ccb));
 650
 651         crit_enter();
 652         descr = TAILQ_FIRST(&softc->work_queue);
 653         if (descr == NULL) {
 654                 crit_exit();
 655                 xpt_release_ccb(start_ccb);
 656         } else {
 657                 TAILQ_REMOVE(&softc->work_queue, descr, tqe);
 658                 next_descr = TAILQ_FIRST(&softc->work_queue);
 659                 crit_exit();
 660
 661                 /* Initiate a transaction using the descr and supplied CCB */
 662                 error = targusermerge(softc, descr, start_ccb);
 663                 if (error == 0)
 664                         error = targsendccb(softc, start_ccb, descr);
 665                 if (error != 0) {
 666                         xpt_print(periph->path,
 667                             "targsendccb failed, err %d\n", error);
 668                         xpt_release_ccb(start_ccb);
 669                         suword(&descr->user_ccb->ccb_h.status,
 670                                CAM_REQ_CMP_ERR);
 671                         crit_enter();
 672                         TAILQ_INSERT_TAIL(&softc->abort_queue, descr, tqe);
 673                         crit_exit();
 674                         notify_user(softc);
 675                 }
 676
 677                 /* If we have more work to do, stay scheduled */
 678                 if (next_descr != NULL)
 679                         xpt_schedule(periph, next_descr->priority);
 680         }
 681 }
 682
 683 static int
 684 targusermerge(struct targ_softc *softc, struct targ_cmd_descr *descr,
 685               union ccb *ccb)
 686 {
 687         struct ccb_hdr *u_ccbh, *k_ccbh;
 688         size_t ccb_len;
 689         int error;
 690
 691         u_ccbh = &descr->user_ccb->ccb_h;
 692         k_ccbh = &ccb->ccb_h;
 693
 694         /*
 695          * There are some fields in the CCB header that need to be
 696          * preserved, the rest we get from the user ccb. (See xpt_merge_ccb)
 697          */
 698         xpt_setup_ccb(k_ccbh, softc->path, descr->priority);
 699         k_ccbh->retry_count = fuword(&u_ccbh->retry_count);
 700         k_ccbh->func_code = descr->func_code;
 701         k_ccbh->flags = fuword(&u_ccbh->flags);
 702         k_ccbh->timeout = fuword(&u_ccbh->timeout);
 703         ccb_len = targccblen(k_ccbh->func_code) - sizeof(struct ccb_hdr);
 704         error = copyin(u_ccbh + 1, k_ccbh + 1, ccb_len);
 705         if (error != 0) {
 706                 k_ccbh->status = CAM_REQ_CMP_ERR;
 707                 return (error);
 708         }
 709
 710         /* Translate usermode abort_ccb pointer to its kernel counterpart */
 711         if (k_ccbh->func_code == XPT_ABORT) {
 712                 struct ccb_abort *cab;
 713                 struct ccb_hdr *ccb_h;
 714
 715                 cab = (struct ccb_abort *)ccb;
 716                 crit_enter();
 717                 TAILQ_FOREACH(ccb_h, &softc->pending_ccb_queue,
 718                     periph_links.tqe) {
 719                         struct targ_cmd_descr *ab_descr;
 720
 721                         ab_descr = (struct targ_cmd_descr *)ccb_h->targ_descr;
 722                         if (ab_descr->user_ccb == cab->abort_ccb) {
 723                                 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
 724                                           ("Changing abort for %p to %p\n",
 725                                           cab->abort_ccb, ccb_h));
 726                                 cab->abort_ccb = (union ccb *)ccb_h;
 727                                 break;
 728                         }
 729                 }
 730                 crit_exit();
 731                 /* CCB not found, set appropriate status */
 732                 if (ccb_h == NULL) {
 733                         k_ccbh->status = CAM_PATH_INVALID;
 734                         error = ESRCH;
 735                 }
 736         }
 737
 738         return (error);
 739 }
 740
 741 /* Build and send a kernel CCB formed from descr->user_ccb */
 742 static int
 743 targsendccb(struct targ_softc *softc, union ccb *ccb,
 744             struct targ_cmd_descr *descr)
 745 {
 746         struct cam_periph_map_info *mapinfo;
 747         struct ccb_hdr *ccb_h;
 748         int error;
 749
 750         ccb_h = &ccb->ccb_h;
 751         mapinfo = &descr->mapinfo;
 752         mapinfo->num_bufs_used = 0;
 753
 754         /*
 755          * There's no way for the user to have a completion
 756          * function, so we put our own completion function in here.
 757          * We also stash in a reference to our descriptor so targreturnccb()
 758          * can find our mapping info.
 759          */
 760         ccb_h->cbfcnp = targdone;
 761         ccb_h->targ_descr = descr;
 762
 763         /*
 764          * We only attempt to map the user memory into kernel space
 765          * if they haven't passed in a physical memory pointer,
 766          * and if there is actually an I/O operation to perform.
 767          * Right now cam_periph_mapmem() only supports SCSI and device
 768          * match CCBs.  For the SCSI CCBs, we only pass the CCB in if
 769          * there's actually data to map.  cam_periph_mapmem() will do the
 770          * right thing, even if there isn't data to map, but since CCBs
 771          * without data are a reasonably common occurance (e.g. test unit
 772          * ready), it will save a few cycles if we check for it here.
 773          */
 774         if (((ccb_h->flags & CAM_DATA_PHYS) == 0)
 775          && (((ccb_h->func_code == XPT_CONT_TARGET_IO)
 776             && ((ccb_h->flags & CAM_DIR_MASK) != CAM_DIR_NONE))
 777           || (ccb_h->func_code == XPT_DEV_MATCH))) {
 778
 779                 error = cam_periph_mapmem(ccb, mapinfo);
 780
 781                 /*
 782                  * cam_periph_mapmem returned an error, we can't continue.
 783                  * Return the error to the user.
 784                  */
 785                 if (error) {
 786                         ccb_h->status = CAM_REQ_CMP_ERR;
 787                         mapinfo->num_bufs_used = 0;
 788                         return (error);
 789                 }
 790         }
 791
 792         /*
 793          * Once queued on the pending CCB list, this CCB will be protected
 794          * by our error recovery handler.
 795          */
 796         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("sendccb %p\n", ccb));
 797         if (XPT_FC_IS_QUEUED(ccb)) {
 798                 crit_enter();
 799                 TAILQ_INSERT_TAIL(&softc->pending_ccb_queue, ccb_h,
 800                                   periph_links.tqe);
 801                 crit_exit();
 802         }
 803         xpt_action(ccb);
 804
 805         return (0);
 806 }
 807
 808 /* Completion routine for CCBs (called in a critical section) */
 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                 notify_user(softc);
 838                 break;
 839         default:
 840                 panic("targdone: impossible xpt opcode %#x",
 841                       done_ccb->ccb_h.func_code);
 842                 /* NOTREACHED */
 843         }
 844 }
 845
 846 /* Return CCBs to the user from the user queue and abort queue */
 847 static int
 848 targread(struct dev_read_args *ap)
 849 {
 850         struct uio *uio = ap->a_uio;
 851         struct descr_queue      *abort_queue;
 852         struct targ_cmd_descr   *user_descr;
 853         struct targ_softc       *softc;
 854         struct ccb_queue  *user_queue;
 855         struct ccb_hdr    *ccb_h;
 856         union  ccb        *user_ccb;
 857         int                read_len, error;
 858
 859         error = 0;
 860         read_len = 0;
 861         softc = (struct targ_softc *)ap->a_head.a_dev->si_drv1;
 862         user_queue = &softc->user_ccb_queue;
 863         abort_queue = &softc->abort_queue;
 864         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targread\n"));
 865
 866         /* If no data is available, wait or return immediately */
 867         cam_periph_lock(softc->periph);
 868         ccb_h = TAILQ_FIRST(user_queue);
 869         user_descr = TAILQ_FIRST(abort_queue);
 870         while (ccb_h == NULL && user_descr == NULL) {
 871                 if ((ap->a_ioflag & IO_NDELAY) == 0) {
 872                         error = sim_lock_sleep(user_queue, PCATCH, "targrd", 0,
 873                                                softc->periph->sim->lock);
 874                         ccb_h = TAILQ_FIRST(user_queue);
 875                         user_descr = TAILQ_FIRST(abort_queue);
 876                         if (error != 0) {
 877                                 if (error == ERESTART) {
 878                                         continue;
 879                                 } else {
 880                                         goto read_fail;
 881                                 }
 882                         }
 883                 } else {
 884                         cam_periph_unlock(softc->periph);
 885                         return (EAGAIN);
 886                 }
 887         }
 888
 889         /* Data is available so fill the user's buffer */
 890         while (ccb_h != NULL) {
 891                 struct targ_cmd_descr *descr;
 892
 893                 if (uio->uio_resid < sizeof(user_ccb))
 894                         break;
 895                 TAILQ_REMOVE(user_queue, ccb_h, periph_links.tqe);
 896                 descr = (struct targ_cmd_descr *)ccb_h->targ_descr;
 897                 user_ccb = descr->user_ccb;
 898                 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
 899                           ("targread ccb %p (%p)\n", ccb_h, user_ccb));
 900                 error = targreturnccb(softc, (union ccb *)ccb_h);
 901                 if (error != 0)
 902                         goto read_fail;
 903                 cam_periph_unlock(softc->periph);
 904                 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio);
 905                 cam_periph_lock(softc->periph);
 906                 if (error != 0)
 907                         goto read_fail;
 908                 read_len += sizeof(user_ccb);
 909
 910                 ccb_h = TAILQ_FIRST(user_queue);
 911         }
 912
 913         /* Flush out any aborted descriptors */
 914         while (user_descr != NULL) {
 915                 if (uio->uio_resid < sizeof(user_ccb))
 916                         break;
 917                 TAILQ_REMOVE(abort_queue, user_descr, tqe);
 918                 user_ccb = user_descr->user_ccb;
 919                 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
 920                           ("targread aborted descr %p (%p)\n",
 921                           user_descr, user_ccb));
 922                 suword(&user_ccb->ccb_h.status, CAM_REQ_ABORTED);
 923                 cam_periph_unlock(softc->periph);
 924                 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio);
 925                 cam_periph_lock(softc->periph);
 926                 if (error != 0)
 927                         goto read_fail;
 928                 read_len += sizeof(user_ccb);
 929
 930                 user_descr = TAILQ_FIRST(abort_queue);
 931         }
 932
 933         /*
 934          * If we've successfully read some amount of data, don't report an
 935          * error.  If the error is persistent, it will be reported on the
 936          * next read().
 937          */
 938         if (read_len == 0 && uio->uio_resid != 0)
 939                 error = ENOSPC;
 940
 941 read_fail:
 942         cam_periph_unlock(softc->periph);
 943         return (error);
 944 }
 945
 946 /* Copy completed ccb back to the user */
 947 static int
 948 targreturnccb(struct targ_softc *softc, union ccb *ccb)
 949 {
 950         struct targ_cmd_descr *descr;
 951         struct ccb_hdr *u_ccbh;
 952         size_t ccb_len;
 953         int error;
 954
 955         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targreturnccb %p\n", ccb));
 956         descr = (struct targ_cmd_descr *)ccb->ccb_h.targ_descr;
 957         u_ccbh = &descr->user_ccb->ccb_h;
 958
 959         /* Copy out the central portion of the ccb_hdr */
 960         copyout(&ccb->ccb_h.retry_count, &u_ccbh->retry_count,
 961                 offsetof(struct ccb_hdr, periph_priv) -
 962                 offsetof(struct ccb_hdr, retry_count));
 963
 964         /* Copy out the rest of the ccb (after the ccb_hdr) */
 965         ccb_len = targccblen(ccb->ccb_h.func_code) - sizeof(struct ccb_hdr);
 966         if (descr->mapinfo.num_bufs_used != 0)
 967                 cam_periph_unmapmem(ccb, &descr->mapinfo);
 968         error = copyout(&ccb->ccb_h + 1, u_ccbh + 1, ccb_len);
 969         if (error != 0) {
 970                 xpt_print(softc->path,
 971                     "targreturnccb - CCB copyout failed (%d)\n", error);
 972         }
 973         /* Free CCB or send back to devq. */
 974         targfreeccb(softc, ccb);
 975
 976         return (error);
 977 }
 978
 979 static union ccb *
 980 targgetccb(struct targ_softc *softc, xpt_opcode type, int priority)
 981 {
 982         union ccb *ccb;
 983         int ccb_len;
 984
 985         ccb_len = targccblen(type);
 986         MALLOC(ccb, union ccb *, ccb_len, M_TARG, M_INTWAIT);
 987         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("getccb %p\n", ccb));
 988
 989         xpt_setup_ccb(&ccb->ccb_h, softc->path, priority);
 990         ccb->ccb_h.func_code = type;
 991         ccb->ccb_h.cbfcnp = targdone;
 992         ccb->ccb_h.targ_descr = targgetdescr(softc);
 993         return (ccb);
 994 }
 995
 996 static void
 997 targfreeccb(struct targ_softc *softc, union ccb *ccb)
 998 {
 999         CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, ("targfreeccb descr %p and\n",
1000                         ccb->ccb_h.targ_descr));
1001         FREE(ccb->ccb_h.targ_descr, M_TARG);
1002
1003         switch (ccb->ccb_h.func_code) {
1004         case XPT_ACCEPT_TARGET_IO:
1005         case XPT_IMMED_NOTIFY:
1006                 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, ("freeing ccb %p\n", ccb));
1007                 FREE(ccb, M_TARG);
1008                 break;
1009         default:
1010                 /* Send back CCB if we got it from the periph */
1011                 if (XPT_FC_IS_QUEUED(ccb)) {
1012                         CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH,
1013                                         ("returning queued ccb %p\n", ccb));
1014                         xpt_release_ccb(ccb);
1015                 } else {
1016                         CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH,
1017                                         ("freeing ccb %p\n", ccb));
1018                         FREE(ccb, M_TARG);
1019                 }
1020                 break;
1021         }
1022 }
1023
1024 static struct targ_cmd_descr *
1025 targgetdescr(struct targ_softc *softc)
1026 {
1027         struct targ_cmd_descr *descr;
1028
1029         MALLOC(descr, struct targ_cmd_descr *, sizeof(*descr),
1030                 M_TARG, M_INTWAIT);
1031         descr->mapinfo.num_bufs_used = 0;
1032         return (descr);
1033 }
1034
1035 static void
1036 targinit(void)
1037 {
1038         dev_ops_add(&targ_ops, 0, 0);
1039 }
1040
1041 static void
1042 targasync(void *callback_arg, u_int32_t code, struct cam_path *path, void *arg)
1043 {
1044         /* All events are handled in usermode by INOTs */
1045         panic("targasync() called, should be an INOT instead");
1046 }
1047
1048 /* Cancel all pending requests and CCBs awaiting work. */
1049 static void
1050 abort_all_pending(struct targ_softc *softc)
1051 {
1052         struct targ_cmd_descr   *descr;
1053         struct ccb_abort         cab;
1054         struct ccb_hdr          *ccb_h;
1055         struct cam_sim          *sim;
1056
1057         CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("abort_all_pending\n"));
1058
1059         /* First abort the descriptors awaiting resources */
1060         while ((descr = TAILQ_FIRST(&softc->work_queue)) != NULL) {
1061                 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
1062                           ("Aborting descr from workq %p\n", descr));
1063                 TAILQ_REMOVE(&softc->work_queue, descr, tqe);
1064                 TAILQ_INSERT_TAIL(&softc->abort_queue, descr, tqe);
1065         }
1066
1067         /*
1068          * Then abort all pending CCBs.
1069          * targdone() will return the aborted CCB via user_ccb_queue
1070          */
1071         xpt_setup_ccb(&cab.ccb_h, softc->path, /*priority*/0);
1072         cab.ccb_h.func_code = XPT_ABORT;
1073         cab.ccb_h.status = CAM_REQ_CMP_ERR;
1074         TAILQ_FOREACH(ccb_h, &softc->pending_ccb_queue, periph_links.tqe) {
1075                 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
1076                           ("Aborting pending CCB %p\n", ccb_h));
1077                 cab.abort_ccb = (union ccb *)ccb_h;
1078                 xpt_action((union ccb *)&cab);
1079                 if (cab.ccb_h.status != CAM_REQ_CMP) {
1080                         xpt_print(cab.ccb_h.path,
1081                             "Unable to abort CCB, status %#x\n",
1082                             cab.ccb_h.status);
1083                 }
1084         }
1085
1086         /* If we aborted at least one pending CCB ok, wait for it. */
1087         if (cab.ccb_h.status == CAM_REQ_CMP) {
1088                 sim = xpt_path_sim(softc->path);
1089                 sim_lock_sleep(&softc->pending_ccb_queue, PCATCH, "tgabrt", 0,
1090                                sim->lock);
1091         }
1092
1093         /* If we aborted anything from the work queue, wakeup user. */
1094         if (!TAILQ_EMPTY(&softc->user_ccb_queue)
1095          || !TAILQ_EMPTY(&softc->abort_queue))
1096                 notify_user(softc);
1097 }
1098
1099 /* Notify the user that data is ready */
1100 static void
1101 notify_user(struct targ_softc *softc)
1102 {
1103         /*
1104          * Notify users sleeping via poll(), kqueue(), and
1105          * blocking read().
1106          */
1107         selwakeup(&softc->read_select);
1108         KNOTE(&softc->read_select.si_note, 0);
1109         wakeup(&softc->user_ccb_queue);
1110 }
1111
1112 /* Convert CAM status to errno values */
1113 static int
1114 targcamstatus(cam_status status)
1115 {
1116         switch (status & CAM_STATUS_MASK) {
1117         case CAM_REQ_CMP:       /* CCB request completed without error */
1118                 return (0);
1119         case CAM_REQ_INPROG:    /* CCB request is in progress */
1120                 return (EINPROGRESS);
1121         case CAM_REQ_CMP_ERR:   /* CCB request completed with an error */
1122                 return (EIO);
1123         case CAM_PROVIDE_FAIL:  /* Unable to provide requested capability */
1124                 return (ENOTTY);
1125         case CAM_FUNC_NOTAVAIL: /* The requested function is not available */
1126                 return (ENOTSUP);
1127         case CAM_LUN_ALRDY_ENA: /* LUN is already enabled for target mode */
1128                 return (EADDRINUSE);
1129         case CAM_PATH_INVALID:  /* Supplied Path ID is invalid */
1130         case CAM_DEV_NOT_THERE: /* SCSI Device Not Installed/there */
1131                 return (ENOENT);
1132         case CAM_REQ_ABORTED:   /* CCB request aborted by the host */
1133                 return (ECANCELED);
1134         case CAM_CMD_TIMEOUT:   /* Command timeout */
1135                 return (ETIMEDOUT);
1136         case CAM_REQUEUE_REQ:   /* Requeue to preserve transaction ordering */
1137                 return (EAGAIN);
1138         case CAM_REQ_INVALID:   /* CCB request was invalid */
1139                 return (EINVAL);
1140         case CAM_RESRC_UNAVAIL: /* Resource Unavailable */
1141                 return (ENOMEM);
1142         case CAM_BUSY:          /* CAM subsytem is busy */
1143         case CAM_UA_ABORT:      /* Unable to abort CCB request */
1144                 return (EBUSY);
1145         default:
1146                 return (ENXIO);
1147         }
1148 }
1149
1150 static size_t
1151 targccblen(xpt_opcode func_code)
1152 {
1153         int len;
1154
1155         /* Codes we expect to see as a target */
1156         switch (func_code) {
1157         case XPT_CONT_TARGET_IO:
1158         case XPT_SCSI_IO:
1159                 len = sizeof(struct ccb_scsiio);
1160                 break;
1161         case XPT_ACCEPT_TARGET_IO:
1162                 len = sizeof(struct ccb_accept_tio);
1163                 break;
1164         case XPT_IMMED_NOTIFY:
1165                 len = sizeof(struct ccb_immed_notify);
1166                 break;
1167         case XPT_REL_SIMQ:
1168                 len = sizeof(struct ccb_relsim);
1169                 break;
1170         case XPT_PATH_INQ:
1171                 len = sizeof(struct ccb_pathinq);
1172                 break;
1173         case XPT_DEBUG:
1174                 len = sizeof(struct ccb_debug);
1175                 break;
1176         case XPT_ABORT:
1177                 len = sizeof(struct ccb_abort);
1178                 break;
1179         case XPT_EN_LUN:
1180                 len = sizeof(struct ccb_en_lun);
1181                 break;
1182         default:
1183                 len = sizeof(union ccb);
1184                 break;
1185         }
1186
1187         return (len);
1188 }