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scsi_cd.c

/*-
 * Copyright (c) 1997 Justin T. Gibbs.
 * Copyright (c) 1997, 1998, 1999, 2000, 2001, 2002, 2003 Kenneth D. Merry.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification, immediately at the beginning of the file.
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*-
 * Portions of this driver taken from the original FreeBSD cd driver.
 * Written by Julian Elischer (julian@tfs.com)
 * for TRW Financial Systems for use under the MACH(2.5) operating system.
 *
 * TRW Financial Systems, in accordance with their agreement with Carnegie
 * Mellon University, makes this software available to CMU to distribute
 * or use in any manner that they see fit as long as this message is kept with
 * the software. For this reason TFS also grants any other persons or
 * organisations permission to use or modify this software.
 *
 * TFS supplies this software to be publicly redistributed
 * on the understanding that TFS is not responsible for the correct
 * functioning of this software in any circumstances.
 *
 * Ported to run under 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
 *
 *      from: cd.c,v 1.83 1997/05/04 15:24:22 joerg Exp $
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/cam/scsi/scsi_cd.c,v 1.102 2007/07/21 18:07:45 kan Exp $");

#include "opt_cd.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/bio.h>
#include <sys/conf.h>
#include <sys/disk.h>
#include <sys/malloc.h>
#include <sys/cdio.h>
#include <sys/cdrio.h>
#include <sys/dvdio.h>
#include <sys/devicestat.h>
#include <sys/sysctl.h>
#include <sys/taskqueue.h>
#include <geom/geom_disk.h>

#include <cam/cam.h>
#include <cam/cam_ccb.h>
#include <cam/cam_periph.h>
#include <cam/cam_xpt_periph.h>
#include <cam/cam_queue.h>
#include <cam/cam_sim.h>

#include <cam/scsi/scsi_message.h>
#include <cam/scsi/scsi_da.h>
#include <cam/scsi/scsi_cd.h>

#define LEADOUT         0xaa            /* leadout toc entry */

struct cd_params {
      u_int32_t blksize;
      u_long    disksize;
};

typedef enum {
      CD_Q_NONE         = 0x00,
      CD_Q_NO_TOUCH           = 0x01,
      CD_Q_BCD_TRACKS         = 0x02,
      CD_Q_NO_CHANGER         = 0x04,
      CD_Q_CHANGER            = 0x08,
      CD_Q_10_BYTE_ONLY = 0x10
} cd_quirks;

typedef enum {
      CD_FLAG_INVALID         = 0x0001,
      CD_FLAG_NEW_DISC  = 0x0002,
      CD_FLAG_DISC_LOCKED     = 0x0004,
      CD_FLAG_DISC_REMOVABLE  = 0x0008,
      CD_FLAG_TAGGED_QUEUING  = 0x0010,
      CD_FLAG_CHANGER         = 0x0040,
      CD_FLAG_ACTIVE          = 0x0080,
      CD_FLAG_SCHED_ON_COMP   = 0x0100,
      CD_FLAG_RETRY_UA  = 0x0200,
      CD_FLAG_VALID_MEDIA     = 0x0400,
      CD_FLAG_VALID_TOC = 0x0800,
      CD_FLAG_SCTX_INIT = 0x1000,
      CD_FLAG_OPEN            = 0x2000
} cd_flags;

typedef enum {
      CD_CCB_PROBE            = 0x01,
      CD_CCB_BUFFER_IO  = 0x02,
      CD_CCB_WAITING          = 0x03,
      CD_CCB_TYPE_MASK  = 0x0F,
      CD_CCB_RETRY_UA         = 0x10
} cd_ccb_state;

typedef enum {
      CHANGER_TIMEOUT_SCHED         = 0x01,
      CHANGER_SHORT_TMOUT_SCHED     = 0x02,
      CHANGER_MANUAL_CALL           = 0x04,
      CHANGER_NEED_TIMEOUT          = 0x08
} cd_changer_flags;

#define ccb_state ppriv_field0
#define ccb_bp ppriv_ptr1

struct cd_tocdata {
      struct ioc_toc_header header;
      struct cd_toc_entry entries[100];
};

struct cd_toc_single {
      struct ioc_toc_header header;
      struct cd_toc_entry entry;
};

typedef enum {
      CD_STATE_PROBE,
      CD_STATE_NORMAL
} cd_state;

struct cd_softc {
      cam_pinfo         pinfo;
      cd_state          state;
      volatile cd_flags flags;
      struct bio_queue_head   bio_queue;
      LIST_HEAD(, ccb_hdr)    pending_ccbs;
      struct cd_params  params;
      union ccb         saved_ccb;
      cd_quirks         quirks;
      STAILQ_ENTRY(cd_softc)  changer_links;
      struct cdchanger  *changer;
      int               bufs_left;
      struct cam_periph *periph;
      int               minimum_command_size;
      int               outstanding_cmds;
      struct task       sysctl_task;
      struct sysctl_ctx_list  sysctl_ctx;
      struct sysctl_oid *sysctl_tree;
      STAILQ_HEAD(, cd_mode_params) mode_queue;
      struct cd_tocdata toc;
      struct disk       *disk;
};

struct cd_page_sizes {
      int page;
      int page_size;
};

static struct cd_page_sizes cd_page_size_table[] =
{
      { AUDIO_PAGE, sizeof(struct cd_audio_page)}
};

struct cd_quirk_entry {
      struct scsi_inquiry_pattern inq_pat;
      cd_quirks quirks;
};

/*
 * The changer quirk entries aren't strictly necessary.  Basically, what
 * they do is tell cdregister() up front that a device is a changer.
 * Otherwise, it will figure that fact out once it sees a LUN on the device
 * that is greater than 0.  If it is known up front that a device is a changer,
 * all I/O to the device will go through the changer scheduling routines, as
 * opposed to the "normal" CD code.
 *
 * NOTE ON 10_BYTE_ONLY quirks:  Any 10_BYTE_ONLY quirks MUST be because
 * your device hangs when it gets a 10 byte command.  Adding a quirk just
 * to get rid of the informative diagnostic message is not acceptable.  All
 * 10_BYTE_ONLY quirks must be documented in full in a PR (which should be
 * referenced in a comment along with the quirk) , and must be approved by
 * ken@FreeBSD.org.  Any quirks added that don't adhere to this policy may
 * be removed until the submitter can explain why they are needed.
 * 10_BYTE_ONLY quirks will be removed (as they will no longer be necessary)
 * when the CAM_NEW_TRAN_CODE work is done.
 */
static struct cd_quirk_entry cd_quirk_table[] =
{
      {
            { T_CDROM, SIP_MEDIA_REMOVABLE, "NRC", "MBR-7", "*"},
             /*quirks*/ CD_Q_CHANGER
      },
      {
            { T_CDROM, SIP_MEDIA_REMOVABLE, "PIONEER", "CD-ROM DRM*",
              "*"}, /* quirks */ CD_Q_CHANGER
      },
      {
            { T_CDROM, SIP_MEDIA_REMOVABLE, "NAKAMICH", "MJ-*", "*"},
             /* quirks */ CD_Q_CHANGER
      },
      {
            { T_CDROM, SIP_MEDIA_REMOVABLE, "CHINON", "CD-ROM CDS-535","*"},
            /* quirks */ CD_Q_BCD_TRACKS
      }
};

static      disk_open_t cdopen;
static      disk_close_t      cdclose;
static      disk_ioctl_t      cdioctl;
static      disk_strategy_t   cdstrategy;

static      periph_init_t     cdinit;
static      periph_ctor_t     cdregister;
static      periph_dtor_t     cdcleanup;
static      periph_start_t    cdstart;
static      periph_oninv_t    cdoninvalidate;
static      void        cdasync(void *callback_arg, u_int32_t code,
                        struct cam_path *path, void *arg);
static      int         cdcmdsizesysctl(SYSCTL_HANDLER_ARGS);
static      void        cdshorttimeout(void *arg);
static      void        cdschedule(struct cam_periph *periph, int priority);
static      void        cdrunchangerqueue(void *arg);
static      void        cdchangerschedule(struct cd_softc *softc);
static      int         cdrunccb(union ccb *ccb,
                         int (*error_routine)(union ccb *ccb,
                                          u_int32_t cam_flags,
                                          u_int32_t sense_flags),
                         u_int32_t cam_flags, u_int32_t sense_flags);
static      union ccb   *cdgetccb(struct cam_periph *periph,
                          u_int32_t priority);
static      void        cddone(struct cam_periph *periph,
                         union ccb *start_ccb);
static      union cd_pages    *cdgetpage(struct cd_mode_params *mode_params);
static      int         cdgetpagesize(int page_num);
static      void        cdprevent(struct cam_periph *periph, int action);
static      int         cdcheckmedia(struct cam_periph *periph);
static      int         cdsize(struct cam_periph *periph, u_int32_t *size);
static      int         cd6byteworkaround(union ccb *ccb);
static      int         cderror(union ccb *ccb, u_int32_t cam_flags,
                        u_int32_t sense_flags);
static      int         cdreadtoc(struct cam_periph *periph, u_int32_t mode, 
                          u_int32_t start, u_int8_t *data, 
                          u_int32_t len, u_int32_t sense_flags);
static      int         cdgetmode(struct cam_periph *periph, 
                          struct cd_mode_params *data, u_int32_t page);
static      int         cdsetmode(struct cam_periph *periph,
                          struct cd_mode_params *data);
static      int         cdplay(struct cam_periph *periph, u_int32_t blk, 
                         u_int32_t len);
static      int         cdreadsubchannel(struct cam_periph *periph, 
                               u_int32_t mode, u_int32_t format, 
                               int track, 
                               struct cd_sub_channel_info *data, 
                               u_int32_t len);
static      int         cdplaymsf(struct cam_periph *periph, u_int32_t startm, 
                          u_int32_t starts, u_int32_t startf, 
                          u_int32_t endm, u_int32_t ends, 
                          u_int32_t endf);
static      int         cdplaytracks(struct cam_periph *periph, 
                             u_int32_t strack, u_int32_t sindex,
                             u_int32_t etrack, u_int32_t eindex);
static      int         cdpause(struct cam_periph *periph, u_int32_t go);
static      int         cdstopunit(struct cam_periph *periph, u_int32_t eject);
static      int         cdstartunit(struct cam_periph *periph, int load);
static      int         cdsetspeed(struct cam_periph *periph,
                           u_int32_t rdspeed, u_int32_t wrspeed);
static      int         cdreportkey(struct cam_periph *periph,
                            struct dvd_authinfo *authinfo);
static      int         cdsendkey(struct cam_periph *periph,
                          struct dvd_authinfo *authinfo);
static      int         cdreaddvdstructure(struct cam_periph *periph,
                                 struct dvd_struct *dvdstruct);

static struct periph_driver cddriver =
{
      cdinit, "cd",
      TAILQ_HEAD_INITIALIZER(cddriver.units), /* generation */ 0
};

PERIPHDRIVER_DECLARE(cd, cddriver);

#ifndef CHANGER_MIN_BUSY_SECONDS
#define CHANGER_MIN_BUSY_SECONDS    5
#endif
#ifndef CHANGER_MAX_BUSY_SECONDS
#define CHANGER_MAX_BUSY_SECONDS    15
#endif

static int changer_min_busy_seconds = CHANGER_MIN_BUSY_SECONDS;
static int changer_max_busy_seconds = CHANGER_MAX_BUSY_SECONDS;

SYSCTL_NODE(_kern_cam, OID_AUTO, cd, CTLFLAG_RD, 0, "CAM CDROM driver");
SYSCTL_NODE(_kern_cam_cd, OID_AUTO, changer, CTLFLAG_RD, 0, "CD Changer");
SYSCTL_INT(_kern_cam_cd_changer, OID_AUTO, min_busy_seconds, CTLFLAG_RW,
         &changer_min_busy_seconds, 0, "Minimum changer scheduling quantum");
TUNABLE_INT("kern.cam.cd.changer.min_busy_seconds", &changer_min_busy_seconds);
SYSCTL_INT(_kern_cam_cd_changer, OID_AUTO, max_busy_seconds, CTLFLAG_RW,
         &changer_max_busy_seconds, 0, "Maximum changer scheduling quantum");
TUNABLE_INT("kern.cam.cd.changer.max_busy_seconds", &changer_max_busy_seconds);

struct cdchanger {
      path_id_t                path_id;
      target_id_t              target_id;
      int                      num_devices;
      struct camq              devq;
      struct timeval                 start_time;
      struct cd_softc                *cur_device;
      struct callout                 short_handle;
      struct callout                 long_handle;
      volatile cd_changer_flags      flags;
      STAILQ_ENTRY(cdchanger)        changer_links;
      STAILQ_HEAD(chdevlist, cd_softc) chluns;
};

static struct mtx changerq_mtx;
static STAILQ_HEAD(changerlist, cdchanger) changerq;
static int num_changers;

MALLOC_DEFINE(M_SCSICD, "scsi_cd", "scsi_cd buffers");

static void
cdinit(void)
{
      cam_status status;

      mtx_init(&changerq_mtx, "cdchangerq", "SCSI CD Changer List", MTX_DEF);
      STAILQ_INIT(&changerq);

      /*
       * Install a global async callback.  This callback will
       * receive async callbacks like "new device found".
       */
      status = xpt_register_async(AC_FOUND_DEVICE, cdasync, NULL, NULL);

      if (status != CAM_REQ_CMP) {
            printf("cd: Failed to attach master async callback "
                   "due to status 0x%x!\n", status);
      }
}

static void
cdoninvalidate(struct cam_periph *periph)
{
      struct cd_softc *softc;

      softc = (struct cd_softc *)periph->softc;

      /*
       * De-register any async callbacks.
       */
      xpt_register_async(0, cdasync, periph, periph->path);

      softc->flags |= CD_FLAG_INVALID;

      /*
       * Return all queued I/O with ENXIO.
       * XXX Handle any transactions queued to the card
       *     with XPT_ABORT_CCB.
       */
      bioq_flush(&softc->bio_queue, NULL, ENXIO);

      /*
       * If this device is part of a changer, and it was scheduled
       * to run, remove it from the run queue since we just nuked
       * all of its scheduled I/O.
       */
      if ((softc->flags & CD_FLAG_CHANGER)
       && (softc->pinfo.index != CAM_UNQUEUED_INDEX))
            camq_remove(&softc->changer->devq, softc->pinfo.index);

      disk_gone(softc->disk);
      xpt_print(periph->path, "lost device\n");
}

static void
cdcleanup(struct cam_periph *periph)
{
      struct cd_softc *softc;

      softc = (struct cd_softc *)periph->softc;

      xpt_print(periph->path, "removing device entry\n");

      if ((softc->flags & CD_FLAG_SCTX_INIT) != 0
          && sysctl_ctx_free(&softc->sysctl_ctx) != 0) {
            xpt_print(periph->path, "can't remove sysctl context\n");
      }

      /*
       * In the queued, non-active case, the device in question
       * has already been removed from the changer run queue.  Since this
       * device is active, we need to de-activate it, and schedule
       * another device to run.  (if there is another one to run)
       */
      if ((softc->flags & CD_FLAG_CHANGER)
       && (softc->flags & CD_FLAG_ACTIVE)) {

            /*
             * The purpose of the short timeout is soley to determine
             * whether the current device has finished or not.  Well,
             * since we're removing the active device, we know that it
             * is finished.  So, get rid of the short timeout.
             * Otherwise, if we're in the time period before the short
             * timeout fires, and there are no other devices in the
             * queue to run, there won't be any other device put in the
             * active slot.  i.e., when we call cdrunchangerqueue()
             * below, it won't do anything.  Then, when the short
             * timeout fires, it'll look at the "current device", which
             * we are free below, and possibly panic the kernel on a
             * bogus pointer reference.
             *
             * The long timeout doesn't really matter, since we
             * decrement the qfrozen_cnt to indicate that there is
             * nothing in the active slot now.  Therefore, there won't
             * be any bogus pointer references there.
             */
            if (softc->changer->flags & CHANGER_SHORT_TMOUT_SCHED) {
                  callout_stop(&softc->changer->short_handle);
                  softc->changer->flags &= ~CHANGER_SHORT_TMOUT_SCHED;
            }
            softc->changer->devq.qfrozen_cnt--;
            softc->changer->flags |= CHANGER_MANUAL_CALL;
            cdrunchangerqueue(softc->changer);
      }

      /*
       * If we're removing the last device on the changer, go ahead and
       * remove the changer device structure.
       */
      if ((softc->flags & CD_FLAG_CHANGER)
       && (--softc->changer->num_devices == 0)) {

            /*
             * Theoretically, there shouldn't be any timeouts left, but
             * I'm not completely sure that that will be the case.  So,
             * it won't hurt to check and see if there are any left.
             */
            if (softc->changer->flags & CHANGER_TIMEOUT_SCHED) {
                  callout_stop(&softc->changer->long_handle);
                  softc->changer->flags &= ~CHANGER_TIMEOUT_SCHED;
            }

            if (softc->changer->flags & CHANGER_SHORT_TMOUT_SCHED) {
                  callout_stop(&softc->changer->short_handle);
                  softc->changer->flags &= ~CHANGER_SHORT_TMOUT_SCHED;
            }

            mtx_lock(&changerq_mtx);
            STAILQ_REMOVE(&changerq, softc->changer, cdchanger,
                        changer_links);
            num_changers--;
            mtx_unlock(&changerq_mtx);
            xpt_print(periph->path, "removing changer entry\n");
            free(softc->changer, M_DEVBUF);
      }
      cam_periph_unlock(periph);
      disk_destroy(softc->disk);
      cam_periph_lock(periph);
      free(softc, M_DEVBUF);
}

static void
cdasync(void *callback_arg, u_int32_t code,
      struct cam_path *path, void *arg)
{
      struct cam_periph *periph;

      periph = (struct cam_periph *)callback_arg;
      switch (code) {
      case AC_FOUND_DEVICE:
      {
            struct ccb_getdev *cgd;
            cam_status status;

            cgd = (struct ccb_getdev *)arg;
            if (cgd == NULL)
                  break;

            if (SID_TYPE(&cgd->inq_data) != T_CDROM
                && SID_TYPE(&cgd->inq_data) != T_WORM)
                  break;

            /*
             * Allocate a peripheral instance for
             * this device and start the probe
             * process.
             */
            status = cam_periph_alloc(cdregister, cdoninvalidate,
                                cdcleanup, cdstart,
                                "cd", CAM_PERIPH_BIO,
                                cgd->ccb_h.path, cdasync,
                                AC_FOUND_DEVICE, cgd);

            if (status != CAM_REQ_CMP
             && status != CAM_REQ_INPROG)
                  printf("cdasync: Unable to attach new device "
                         "due to status 0x%x\n", status);

            break;
      }
      case AC_SENT_BDR:
      case AC_BUS_RESET:
      {
            struct cd_softc *softc;
            struct ccb_hdr *ccbh;

            softc = (struct cd_softc *)periph->softc;
            /*
             * Don't fail on the expected unit attention
             * that will occur.
             */
            softc->flags |= CD_FLAG_RETRY_UA;
            LIST_FOREACH(ccbh, &softc->pending_ccbs, periph_links.le)
                  ccbh->ccb_state |= CD_CCB_RETRY_UA;
            /* FALLTHROUGH */
      }
      default:
            cam_periph_async(periph, code, path, arg);
            break;
      }
}

static void
cdsysctlinit(void *context, int pending)
{
      struct cam_periph *periph;
      struct cd_softc *softc;
      char tmpstr[80], tmpstr2[80];

      periph = (struct cam_periph *)context;
      if (cam_periph_acquire(periph) != CAM_REQ_CMP)
            return;

      softc = (struct cd_softc *)periph->softc;
      snprintf(tmpstr, sizeof(tmpstr), "CAM CD unit %d", periph->unit_number);
      snprintf(tmpstr2, sizeof(tmpstr2), "%d", periph->unit_number);

      mtx_lock(&Giant);

      sysctl_ctx_init(&softc->sysctl_ctx);
      softc->flags |= CD_FLAG_SCTX_INIT;
      softc->sysctl_tree = SYSCTL_ADD_NODE(&softc->sysctl_ctx,
            SYSCTL_STATIC_CHILDREN(_kern_cam_cd), OID_AUTO,
            tmpstr2, CTLFLAG_RD, 0, tmpstr);

      if (softc->sysctl_tree == NULL) {
            printf("cdsysctlinit: unable to allocate sysctl tree\n");
            mtx_unlock(&Giant);
            cam_periph_release(periph);
            return;
      }

      /*
       * Now register the sysctl handler, so the user can the value on
       * the fly.
       */
      SYSCTL_ADD_PROC(&softc->sysctl_ctx,SYSCTL_CHILDREN(softc->sysctl_tree),
            OID_AUTO, "minimum_cmd_size", CTLTYPE_INT | CTLFLAG_RW,
            &softc->minimum_command_size, 0, cdcmdsizesysctl, "I",
            "Minimum CDB size");

      mtx_unlock(&Giant);
      cam_periph_release(periph);
}

/*
 * We have a handler function for this so we can check the values when the
 * user sets them, instead of every time we look at them.
 */
static int
cdcmdsizesysctl(SYSCTL_HANDLER_ARGS)
{
      int error, value;

      value = *(int *)arg1;

      error = sysctl_handle_int(oidp, &value, 0, req);

      if ((error != 0)
       || (req->newptr == NULL))
            return (error);

      /*
       * The only real values we can have here are 6 or 10.  I don't
       * really forsee having 12 be an option at any time in the future.
       * So if the user sets something less than or equal to 6, we'll set
       * it to 6.  If he sets something greater than 6, we'll set it to 10.
       *
       * I suppose we could just return an error here for the wrong values,
       * but I don't think it's necessary to do so, as long as we can
       * determine the user's intent without too much trouble.
       */
      if (value < 6)
            value = 6;
      else if (value > 6)
            value = 10;

      *(int *)arg1 = value;

      return (0);
}

static cam_status
cdregister(struct cam_periph *periph, void *arg)
{
      struct cd_softc *softc;
      struct ccb_pathinq cpi;
      struct ccb_getdev *cgd;
      char tmpstr[80];
      caddr_t match;

      cgd = (struct ccb_getdev *)arg;
      if (periph == NULL) {
            printf("cdregister: periph was NULL!!\n");
            return(CAM_REQ_CMP_ERR);
      }
      if (cgd == NULL) {
            printf("cdregister: no getdev CCB, can't register device\n");
            return(CAM_REQ_CMP_ERR);
      }

      softc = (struct cd_softc *)malloc(sizeof(*softc),M_DEVBUF,M_NOWAIT);

      if (softc == NULL) {
            printf("cdregister: Unable to probe new device. "
                   "Unable to allocate softc\n");                       
            return(CAM_REQ_CMP_ERR);
      }

      bzero(softc, sizeof(*softc));
      LIST_INIT(&softc->pending_ccbs);
      STAILQ_INIT(&softc->mode_queue);
      softc->state = CD_STATE_PROBE;
      bioq_init(&softc->bio_queue);
      if (SID_IS_REMOVABLE(&cgd->inq_data))
            softc->flags |= CD_FLAG_DISC_REMOVABLE;
      if ((cgd->inq_data.flags & SID_CmdQue) != 0)
            softc->flags |= CD_FLAG_TAGGED_QUEUING;

      periph->softc = softc;
      softc->periph = periph;

      /*
       * See if this device has any quirks.
       */
      match = cam_quirkmatch((caddr_t)&cgd->inq_data,
                         (caddr_t)cd_quirk_table,
                         sizeof(cd_quirk_table)/sizeof(*cd_quirk_table),
                         sizeof(*cd_quirk_table), scsi_inquiry_match);

      if (match != NULL)
            softc->quirks = ((struct cd_quirk_entry *)match)->quirks;
      else
            softc->quirks = CD_Q_NONE;

      /* Check if the SIM does not want 6 byte commands */
      xpt_setup_ccb(&cpi.ccb_h, periph->path, /*priority*/1);
      cpi.ccb_h.func_code = XPT_PATH_INQ;
      xpt_action((union ccb *)&cpi);
      if (cpi.ccb_h.status == CAM_REQ_CMP && (cpi.hba_misc & PIM_NO_6_BYTE))
            softc->quirks |= CD_Q_10_BYTE_ONLY;

      TASK_INIT(&softc->sysctl_task, 0, cdsysctlinit, periph);

      /* The default is 6 byte commands, unless quirked otherwise */
      if (softc->quirks & CD_Q_10_BYTE_ONLY)
            softc->minimum_command_size = 10;
      else
            softc->minimum_command_size = 6;

      /*
       * Load the user's default, if any.
       */
      snprintf(tmpstr, sizeof(tmpstr), "kern.cam.cd.%d.minimum_cmd_size",
             periph->unit_number);
      TUNABLE_INT_FETCH(tmpstr, &softc->minimum_command_size);

      /* 6 and 10 are the only permissible values here. */
      if (softc->minimum_command_size < 6)
            softc->minimum_command_size = 6;
      else if (softc->minimum_command_size > 6)
            softc->minimum_command_size = 10;

      /*
       * We need to register the statistics structure for this device,
       * but we don't have the blocksize yet for it.  So, we register
       * the structure and indicate that we don't have the blocksize
       * yet.  Unlike other SCSI peripheral drivers, we explicitly set
       * the device type here to be CDROM, rather than just ORing in
       * the device type.  This is because this driver can attach to either
       * CDROM or WORM devices, and we want this peripheral driver to
       * show up in the devstat list as a CD peripheral driver, not a
       * WORM peripheral driver.  WORM drives will also have the WORM
       * driver attached to them.
       */
      cam_periph_unlock(periph);
      softc->disk = disk_alloc();
      softc->disk->d_devstat = devstat_new_entry("cd", 
                    periph->unit_number, 0,
                    DEVSTAT_BS_UNAVAILABLE,
                    DEVSTAT_TYPE_CDROM | DEVSTAT_TYPE_IF_SCSI,
                    DEVSTAT_PRIORITY_CD);
      softc->disk->d_open = cdopen;
      softc->disk->d_close = cdclose;
      softc->disk->d_strategy = cdstrategy;
      softc->disk->d_ioctl = cdioctl;
      softc->disk->d_name = "cd";
      softc->disk->d_unit = periph->unit_number;
      softc->disk->d_drv1 = periph;
      softc->disk->d_flags = 0;
      disk_create(softc->disk, DISK_VERSION);
      cam_periph_lock(periph);

      /*
       * Add an async callback so that we get
       * notified if this device goes away.
       */
      xpt_register_async(AC_SENT_BDR | AC_BUS_RESET | AC_LOST_DEVICE,
                     cdasync, periph, periph->path);

      /*
       * If the target lun is greater than 0, we most likely have a CD
       * changer device.  Check the quirk entries as well, though, just
       * in case someone has a CD tower with one lun per drive or
       * something like that.  Also, if we know up front that a
       * particular device is a changer, we can mark it as such starting
       * with lun 0, instead of lun 1.  It shouldn't be necessary to have
       * a quirk entry to define something as a changer, however.
       */
      if (((cgd->ccb_h.target_lun > 0)
        && ((softc->quirks & CD_Q_NO_CHANGER) == 0))
       || ((softc->quirks & CD_Q_CHANGER) != 0)) {
            struct cdchanger *nchanger;
            struct cam_periph *nperiph;
            struct cam_path *path;
            cam_status status;
            int found;

            /* Set the changer flag in the current device's softc */
            softc->flags |= CD_FLAG_CHANGER;

            /*
             * Now, look around for an existing changer device with the
             * same path and target ID as the current device.
             */
            mtx_lock(&changerq_mtx);
            for (found = 0,
                 nchanger = (struct cdchanger *)STAILQ_FIRST(&changerq);
                 nchanger != NULL;
                 nchanger = STAILQ_NEXT(nchanger, changer_links)){
                  if ((nchanger->path_id == cgd->ccb_h.path_id) 
                   && (nchanger->target_id == cgd->ccb_h.target_id)) {
                        found = 1;
                        break;
                  }
            }
            mtx_unlock(&changerq_mtx);

            /*
             * If we found a matching entry, just add this device to
             * the list of devices on this changer.
             */
            if (found == 1) {
                  struct chdevlist *chlunhead;

                  chlunhead = &nchanger->chluns;

                  /*
                   * XXX KDM look at consolidating this code with the
                   * code below in a separate function.
                   */

                  /*
                   * Create a path with lun id 0, and see if we can
                   * find a matching device
                   */
                  status = xpt_create_path(&path, /*periph*/ periph,
                                     cgd->ccb_h.path_id,
                                     cgd->ccb_h.target_id, 0);

                  if ((status == CAM_REQ_CMP)
                   && ((nperiph = cam_periph_find(path, "cd")) != NULL)){
                        struct cd_softc *nsoftc;

                        nsoftc = (struct cd_softc *)nperiph->softc;

                        if ((nsoftc->flags & CD_FLAG_CHANGER) == 0){
                              nsoftc->flags |= CD_FLAG_CHANGER;
                              nchanger->num_devices++;
                              if (camq_resize(&nchanger->devq,
                                 nchanger->num_devices)!=CAM_REQ_CMP){
                                    printf("cdregister: "
                                           "camq_resize "
                                           "failed, changer "
                                           "support may "
                                           "be messed up\n");
                              }
                              nsoftc->changer = nchanger;
                              nsoftc->pinfo.index =CAM_UNQUEUED_INDEX;

                              STAILQ_INSERT_TAIL(&nchanger->chluns,
                                            nsoftc,changer_links);
                        }
                        xpt_free_path(path);
                  } else if (status == CAM_REQ_CMP)
                        xpt_free_path(path);
                  else {
                        printf("cdregister: unable to allocate path\n"
                               "cdregister: changer support may be "
                               "broken\n");
                  }

                  nchanger->num_devices++;

                  softc->changer = nchanger;
                  softc->pinfo.index = CAM_UNQUEUED_INDEX;

                  if (camq_resize(&nchanger->devq,
                      nchanger->num_devices) != CAM_REQ_CMP) {
                        printf("cdregister: camq_resize "
                               "failed, changer support may "
                               "be messed up\n");
                  }

                  STAILQ_INSERT_TAIL(chlunhead, softc, changer_links);
            }
            /*
             * In this case, we don't already have an entry for this
             * particular changer, so we need to create one, add it to
             * the queue, and queue this device on the list for this
             * changer.  Before we queue this device, however, we need
             * to search for lun id 0 on this target, and add it to the
             * queue first, if it exists.  (and if it hasn't already
             * been marked as part of the changer.)
             */
            else {
                  nchanger = malloc(sizeof(struct cdchanger),
                        M_DEVBUF, M_NOWAIT);

                  if (nchanger == NULL) {
                        softc->flags &= ~CD_FLAG_CHANGER;
                        printf("cdregister: unable to malloc "
                               "changer structure\ncdregister: "
                               "changer support disabled\n");

                        /*
                         * Yes, gotos can be gross but in this case
                         * I think it's justified..
                         */
                        goto cdregisterexit;
                  }

                  /* zero the structure */
                  bzero(nchanger, sizeof(struct cdchanger));

                  if (camq_init(&nchanger->devq, 1) != 0) {
                        softc->flags &= ~CD_FLAG_CHANGER;
                        printf("cdregister: changer support "
                               "disabled\n");
                        goto cdregisterexit;
                  }

                  nchanger->path_id = cgd->ccb_h.path_id;
                  nchanger->target_id = cgd->ccb_h.target_id;

                  /* this is superfluous, but it makes things clearer */
                  nchanger->num_devices = 0;

                  STAILQ_INIT(&nchanger->chluns);

                  callout_init_mtx(&nchanger->long_handle,
                      periph->sim->mtx, 0);
                  callout_init_mtx(&nchanger->short_handle,
                      periph->sim->mtx, 0);

                  mtx_lock(&changerq_mtx);
                  num_changers++;
                  STAILQ_INSERT_TAIL(&changerq, nchanger,
                                 changer_links);
                  mtx_unlock(&changerq_mtx);
                  
                  /*
                   * Create a path with lun id 0, and see if we can
                   * find a matching device
                   */
                  status = xpt_create_path(&path, /*periph*/ periph,
                                     cgd->ccb_h.path_id,
                                     cgd->ccb_h.target_id, 0);

                  /*
                   * If we were able to allocate the path, and if we
                   * find a matching device and it isn't already
                   * marked as part of a changer, then we add it to
                   * the current changer.
                   */
                  if ((status == CAM_REQ_CMP)
                   && ((nperiph = cam_periph_find(path, "cd")) != NULL)
                   && ((((struct cd_softc *)periph->softc)->flags &
                         CD_FLAG_CHANGER) == 0)) {
                        struct cd_softc *nsoftc;

                        nsoftc = (struct cd_softc *)nperiph->softc;

                        nsoftc->flags |= CD_FLAG_CHANGER;
                        nchanger->num_devices++;
                        if (camq_resize(&nchanger->devq,
                            nchanger->num_devices) != CAM_REQ_CMP) {
                              printf("cdregister: camq_resize "
                                     "failed, changer support may "
                                     "be messed up\n");
                        }
                        nsoftc->changer = nchanger;
                        nsoftc->pinfo.index = CAM_UNQUEUED_INDEX;

                        STAILQ_INSERT_TAIL(&nchanger->chluns,
                                       nsoftc, changer_links);
                        xpt_free_path(path);
                  } else if (status == CAM_REQ_CMP)
                        xpt_free_path(path);
                  else {
                        printf("cdregister: unable to allocate path\n"
                               "cdregister: changer support may be "
                               "broken\n");
                  }

                  softc->changer = nchanger;
                  softc->pinfo.index = CAM_UNQUEUED_INDEX;
                  nchanger->num_devices++;
                  if (camq_resize(&nchanger->devq,
                      nchanger->num_devices) != CAM_REQ_CMP) {
                        printf("cdregister: camq_resize "
                               "failed, changer support may "
                               "be messed up\n");
                  }
                  STAILQ_INSERT_TAIL(&nchanger->chluns, softc,
                                 changer_links);
            }
      }

cdregisterexit:

      /*
       * Refcount and block open attempts until we are setup
       * Can't block
       */
      (void)cam_periph_hold(periph, PRIBIO);

      if ((softc->flags & CD_FLAG_CHANGER) == 0)
            xpt_schedule(periph, /*priority*/5);
      else
            cdschedule(periph, /*priority*/ 5);

      return(CAM_REQ_CMP);
}

static int
cdopen(struct disk *dp)
{
      struct cam_periph *periph;
      struct cd_softc *softc;
      int error;

      periph = (struct cam_periph *)dp->d_drv1;
      if (periph == NULL)
            return (ENXIO);

      softc = (struct cd_softc *)periph->softc;

      if (cam_periph_acquire(periph) != CAM_REQ_CMP)
            return(ENXIO);

      cam_periph_lock(periph);

      if (softc->flags & CD_FLAG_INVALID) {
            cam_periph_unlock(periph);
            cam_periph_release(periph);
            return(ENXIO);
      }

      if ((error = cam_periph_hold(periph, PRIBIO | PCATCH)) != 0) {
            cam_periph_unlock(periph);
            cam_periph_release(periph);
            return (error);
      }

      /* Closes aren't symmetrical with opens, so fix up the refcounting. */
      if (softc->flags & CD_FLAG_OPEN)
            cam_periph_release(periph);
      else
            softc->flags |= CD_FLAG_OPEN;

      /*
       * Check for media, and set the appropriate flags.  We don't bail
       * if we don't have media, but then we don't allow anything but the
       * CDIOCEJECT/CDIOCCLOSE ioctls if there is no media.
       */
      cdcheckmedia(periph);

      CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("leaving cdopen\n"));
      cam_periph_unhold(periph);
      cam_periph_unlock(periph);

      return (0);
}

static int
cdclose(struct disk *dp)
{
      struct      cam_periph *periph;
      struct      cd_softc *softc;

      periph = (struct cam_periph *)dp->d_drv1;
      if (periph == NULL)
            return (ENXIO);   

      softc = (struct cd_softc *)periph->softc;

      cam_periph_lock(periph);
      cam_periph_hold(periph, PRIBIO);

      if ((softc->flags & CD_FLAG_DISC_REMOVABLE) != 0)
            cdprevent(periph, PR_ALLOW);

      /*
       * Since we're closing this CD, mark the blocksize as unavailable.
       * It will be marked as available when the CD is opened again.
       */
      softc->disk->d_devstat->flags |= DEVSTAT_BS_UNAVAILABLE;

      /*
       * We'll check the media and toc again at the next open().
       */
      softc->flags &= ~(CD_FLAG_VALID_MEDIA|CD_FLAG_VALID_TOC|CD_FLAG_OPEN);

      cam_periph_unhold(periph);
      cam_periph_unlock(periph);
      cam_periph_release(periph);

      return (0);
}

static void
cdshorttimeout(void *arg)
{
      struct cdchanger *changer;

      changer = (struct cdchanger *)arg;

      /* Always clear the short timeout flag, since that's what we're in */
      changer->flags &= ~CHANGER_SHORT_TMOUT_SCHED;

      /*
       * Check to see if there is any more pending or outstanding I/O for
       * this device.  If not, move it out of the active slot.
       */
      if ((bioq_first(&changer->cur_device->bio_queue) == NULL)
       && (changer->cur_device->outstanding_cmds == 0)) {
            changer->flags |= CHANGER_MANUAL_CALL;
            cdrunchangerqueue(changer);
      }
}

/*
 * This is a wrapper for xpt_schedule.  It only applies to changers.
 */
static void
cdschedule(struct cam_periph *periph, int priority)
{
      struct cd_softc *softc;

      softc = (struct cd_softc *)periph->softc;

      /*
       * If this device isn't currently queued, and if it isn't
       * the active device, then we queue this device and run the
       * changer queue if there is no timeout scheduled to do it.
       * If this device is the active device, just schedule it
       * to run again.  If this device is queued, there should be
       * a timeout in place already that will make sure it runs.
       */
      if ((softc->pinfo.index == CAM_UNQUEUED_INDEX) 
       && ((softc->flags & CD_FLAG_ACTIVE) == 0)) {
            /*
             * We don't do anything with the priority here.
             * This is strictly a fifo queue.
             */
            softc->pinfo.priority = 1;
            softc->pinfo.generation = ++softc->changer->devq.generation;
            camq_insert(&softc->changer->devq, (cam_pinfo *)softc);

            /*
             * Since we just put a device in the changer queue,
             * check and see if there is a timeout scheduled for
             * this changer.  If so, let the timeout handle
             * switching this device into the active slot.  If
             * not, manually call the timeout routine to
             * bootstrap things.
             */
            if (((softc->changer->flags & CHANGER_TIMEOUT_SCHED)==0)
             && ((softc->changer->flags & CHANGER_NEED_TIMEOUT)==0)
             && ((softc->changer->flags & CHANGER_SHORT_TMOUT_SCHED)==0)){
                  softc->changer->flags |= CHANGER_MANUAL_CALL;
                  cdrunchangerqueue(softc->changer);
            }
      } else if ((softc->flags & CD_FLAG_ACTIVE)
            && ((softc->flags & CD_FLAG_SCHED_ON_COMP) == 0))
            xpt_schedule(periph, priority);
}

static void
cdrunchangerqueue(void *arg)
{
      struct cd_softc *softc;
      struct cdchanger *changer;
      int called_from_timeout;

      changer = (struct cdchanger *)arg;

      /*
       * If we have NOT been called from cdstrategy() or cddone(), and
       * instead from a timeout routine, go ahead and clear the
       * timeout flag.
       */
      if ((changer->flags & CHANGER_MANUAL_CALL) == 0) {
            changer->flags &= ~CHANGER_TIMEOUT_SCHED;
            called_from_timeout = 1;
      } else
            called_from_timeout = 0;

      /* Always clear the manual call flag */
      changer->flags &= ~CHANGER_MANUAL_CALL;

      /* nothing to do if the queue is empty */
      if (changer->devq.entries <= 0) {
            return;
      }

      /*
       * If the changer queue is frozen, that means we have an active
       * device.
       */
      if (changer->devq.qfrozen_cnt > 0) {

            /*
             * We always need to reset the frozen count and clear the
             * active flag.
             */
            changer->devq.qfrozen_cnt--;
            changer->cur_device->flags &= ~CD_FLAG_ACTIVE;
            changer->cur_device->flags &= ~CD_FLAG_SCHED_ON_COMP;

            if (changer->cur_device->outstanding_cmds > 0) {
                  changer->cur_device->flags |= CD_FLAG_SCHED_ON_COMP;
                  changer->cur_device->bufs_left = 
                        changer->cur_device->outstanding_cmds;
                  if (called_from_timeout) {
                        callout_reset(&changer->long_handle,
                              changer_max_busy_seconds * hz,
                            cdrunchangerqueue, changer);
                        changer->flags |= CHANGER_TIMEOUT_SCHED;
                  }
                  return;
            }

            /*
             * Check to see whether the current device has any I/O left
             * to do.  If so, requeue it at the end of the queue.  If
             * not, there is no need to requeue it.
             */
            if (bioq_first(&changer->cur_device->bio_queue) != NULL) {

                  changer->cur_device->pinfo.generation =
                        ++changer->devq.generation;
                  camq_insert(&changer->devq,
                        (cam_pinfo *)changer->cur_device);
            } 
      }

      softc = (struct cd_softc *)camq_remove(&changer->devq, CAMQ_HEAD);

      changer->cur_device = softc;

      changer->devq.qfrozen_cnt++;
      softc->flags |= CD_FLAG_ACTIVE;

      /* Just in case this device is waiting */
      wakeup(&softc->changer);
      xpt_schedule(softc->periph, /*priority*/ 1);

      /*
       * Get rid of any pending timeouts, and set a flag to schedule new
       * ones so this device gets its full time quantum.
       */
      if (changer->flags & CHANGER_TIMEOUT_SCHED) {
            callout_stop(&changer->long_handle);
            changer->flags &= ~CHANGER_TIMEOUT_SCHED;
      }

      if (changer->flags & CHANGER_SHORT_TMOUT_SCHED) {
            callout_stop(&changer->short_handle);
            changer->flags &= ~CHANGER_SHORT_TMOUT_SCHED;
      }

      /*
       * We need to schedule timeouts, but we only do this after the
       * first transaction has completed.  This eliminates the changer
       * switch time.
       */
      changer->flags |= CHANGER_NEED_TIMEOUT;
}

static void
cdchangerschedule(struct cd_softc *softc)
{
      struct cdchanger *changer;

      changer = softc->changer;

      /*
       * If this is a changer, and this is the current device,
       * and this device has at least the minimum time quantum to
       * run, see if we can switch it out.
       */
      if ((softc->flags & CD_FLAG_ACTIVE) 
       && ((changer->flags & CHANGER_SHORT_TMOUT_SCHED) == 0)
       && ((changer->flags & CHANGER_NEED_TIMEOUT) == 0)) {
            /*
             * We try three things here.  The first is that we
             * check to see whether the schedule on completion
             * flag is set.  If it is, we decrement the number
             * of buffers left, and if it's zero, we reschedule.
             * Next, we check to see whether the pending buffer
             * queue is empty and whether there are no
             * outstanding transactions.  If so, we reschedule.
             * Next, we see if the pending buffer queue is empty.
             * If it is, we set the number of buffers left to
             * the current active buffer count and set the
             * schedule on complete flag.
             */
            if (softc->flags & CD_FLAG_SCHED_ON_COMP) {
                  if (--softc->bufs_left == 0) {
                        softc->changer->flags |=
                              CHANGER_MANUAL_CALL;
                        softc->flags &= ~CD_FLAG_SCHED_ON_COMP;
                        cdrunchangerqueue(softc->changer);
                  }
            } else if ((bioq_first(&softc->bio_queue) == NULL)
                    && (softc->outstanding_cmds == 0)) {
                  softc->changer->flags |= CHANGER_MANUAL_CALL;
                  cdrunchangerqueue(softc->changer);
            }
      } else if ((softc->changer->flags & CHANGER_NEED_TIMEOUT) 
            && (softc->flags & CD_FLAG_ACTIVE)) {

            /*
             * Now that the first transaction to this
             * particular device has completed, we can go ahead
             * and schedule our timeouts.
             */
            if ((changer->flags & CHANGER_TIMEOUT_SCHED) == 0) {
                  callout_reset(&changer->long_handle,
                      changer_max_busy_seconds * hz,
                      cdrunchangerqueue, changer);
                  changer->flags |= CHANGER_TIMEOUT_SCHED;
            } else
                  printf("cdchangerschedule: already have a long"
                         " timeout!\n");

            if ((changer->flags & CHANGER_SHORT_TMOUT_SCHED) == 0) {
                  callout_reset(&changer->short_handle,
                      changer_min_busy_seconds * hz,
                      cdshorttimeout, changer);
                  changer->flags |= CHANGER_SHORT_TMOUT_SCHED;
            } else
                  printf("cdchangerschedule: already have a short "
                         "timeout!\n");

            /*
             * We just scheduled timeouts, no need to schedule
             * more.
             */
            changer->flags &= ~CHANGER_NEED_TIMEOUT;

      }
}

static int
cdrunccb(union ccb *ccb, int (*error_routine)(union ccb *ccb,
                                    u_int32_t cam_flags,
                                    u_int32_t sense_flags),
       u_int32_t cam_flags, u_int32_t sense_flags)
{
      struct cd_softc *softc;
      struct cam_periph *periph;
      int error;

      periph = xpt_path_periph(ccb->ccb_h.path);
      softc = (struct cd_softc *)periph->softc;

      error = cam_periph_runccb(ccb, error_routine, cam_flags, sense_flags,
                          softc->disk->d_devstat);

      if (softc->flags & CD_FLAG_CHANGER)
            cdchangerschedule(softc);

      return(error);
}

static union ccb *
cdgetccb(struct cam_periph *periph, u_int32_t priority)
{
      struct cd_softc *softc;

      softc = (struct cd_softc *)periph->softc;

      if (softc->flags & CD_FLAG_CHANGER) {
            /*
             * This should work the first time this device is woken up,
             * but just in case it doesn't, we use a while loop.
             */
            while ((softc->flags & CD_FLAG_ACTIVE) == 0) {
                  /*
                   * If this changer isn't already queued, queue it up.
                   */
                  if (softc->pinfo.index == CAM_UNQUEUED_INDEX) {
                        softc->pinfo.priority = 1;
                        softc->pinfo.generation =
                              ++softc->changer->devq.generation;
                        camq_insert(&softc->changer->devq,
                                  (cam_pinfo *)softc);
                  }
                  if (((softc->changer->flags & CHANGER_TIMEOUT_SCHED)==0)
                   && ((softc->changer->flags & CHANGER_NEED_TIMEOUT)==0)
                   && ((softc->changer->flags
                        & CHANGER_SHORT_TMOUT_SCHED)==0)) {
                        softc->changer->flags |= CHANGER_MANUAL_CALL;
                        cdrunchangerqueue(softc->changer);
                  } else
                        msleep(&softc->changer, periph->sim->mtx,
                            PRIBIO, "cgticb", 0);
            }
      }
      return(cam_periph_getccb(periph, priority));
}


/*
 * Actually translate the requested transfer into one the physical driver
 * can understand.  The transfer is described by a buf and will include
 * only one physical transfer.
 */
static void
cdstrategy(struct bio *bp)
{
      struct cam_periph *periph;
      struct cd_softc *softc;

      periph = (struct cam_periph *)bp->bio_disk->d_drv1;
      if (periph == NULL) {
            biofinish(bp, NULL, ENXIO);
            return;
      }

      cam_periph_lock(periph);
      CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("entering cdstrategy\n"));

      softc = (struct cd_softc *)periph->softc;

      /*
       * If the device has been made invalid, error out
       */
      if ((softc->flags & CD_FLAG_INVALID)) {
            cam_periph_unlock(periph);
            biofinish(bp, NULL, ENXIO);
            return;
      }

        /*
       * If we don't have valid media, look for it before trying to
       * schedule the I/O.
       */
      if ((softc->flags & CD_FLAG_VALID_MEDIA) == 0) {
            int error;

            error = cdcheckmedia(periph);
            if (error != 0) {
                  cam_periph_unlock(periph);
                  biofinish(bp, NULL, error);
                  return;
            }
      }

      /*
       * Place it in the queue of disk activities for this disk
       */
      bioq_disksort(&softc->bio_queue, bp);

      /*
       * Schedule ourselves for performing the work.  We do things
       * differently for changers.
       */
      if ((softc->flags & CD_FLAG_CHANGER) == 0)
            xpt_schedule(periph, /* XXX priority */1);
      else
            cdschedule(periph, /* priority */ 1);

      cam_periph_unlock(periph);
      return;
}

static void
cdstart(struct cam_periph *periph, union ccb *start_ccb)
{
      struct cd_softc *softc;
      struct bio *bp;
      struct ccb_scsiio *csio;
      struct scsi_read_capacity_data *rcap;

      softc = (struct cd_softc *)periph->softc;

      CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("entering cdstart\n"));

      switch (softc->state) {
      case CD_STATE_NORMAL:
      {
            bp = bioq_first(&softc->bio_queue);
            if (periph->immediate_priority <= periph->pinfo.priority) {
                  start_ccb->ccb_h.ccb_state = CD_CCB_WAITING;

                  SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
                                periph_links.sle);
                  periph->immediate_priority = CAM_PRIORITY_NONE;
                  wakeup(&periph->ccb_list);
            } else if (bp == NULL) {
                  xpt_release_ccb(start_ccb);
            } else {
                  bioq_remove(&softc->bio_queue, bp);

                  devstat_start_transaction_bio(softc->disk->d_devstat, bp);

                  scsi_read_write(&start_ccb->csio,
                              /*retries*/4,
                              /* cbfcnp */ cddone,
                              MSG_SIMPLE_Q_TAG,
                              /* read */bp->bio_cmd == BIO_READ,
                              /* byte2 */ 0,
                              /* minimum_cmd_size */ 10,
                              /* lba */ bp->bio_offset /
                                softc->params.blksize,
                              bp->bio_bcount / softc->params.blksize,
                              /* data_ptr */ bp->bio_data,
                              /* dxfer_len */ bp->bio_bcount,
                              /* sense_len */ SSD_FULL_SIZE,
                              /* timeout */ 30000);
                  start_ccb->ccb_h.ccb_state = CD_CCB_BUFFER_IO;

                  
                  LIST_INSERT_HEAD(&softc->pending_ccbs,
                               &start_ccb->ccb_h, periph_links.le);
                  softc->outstanding_cmds++;

                  /* We expect a unit attention from this device */
                  if ((softc->flags & CD_FLAG_RETRY_UA) != 0) {
                        start_ccb->ccb_h.ccb_state |= CD_CCB_RETRY_UA;
                        softc->flags &= ~CD_FLAG_RETRY_UA;
                  }

                  start_ccb->ccb_h.ccb_bp = bp;
                  bp = bioq_first(&softc->bio_queue);

                  xpt_action(start_ccb);
            }
            if (bp != NULL) {
                  /* Have more work to do, so ensure we stay scheduled */
                  xpt_schedule(periph, /* XXX priority */1);
            }
            break;
      }
      case CD_STATE_PROBE:
      {

            rcap = (struct scsi_read_capacity_data *)malloc(sizeof(*rcap),
                                                M_SCSICD,
                                                M_NOWAIT);
            if (rcap == NULL) {
                  xpt_print(periph->path,
                      "cdstart: Couldn't malloc read_capacity data\n");
                  /* cd_free_periph??? */
                  break;
            }
            csio = &start_ccb->csio;
            scsi_read_capacity(csio,
                           /*retries*/1,
                           cddone,
                           MSG_SIMPLE_Q_TAG,
                           rcap,
                           SSD_FULL_SIZE,
                           /*timeout*/20000);
            start_ccb->ccb_h.ccb_bp = NULL;
            start_ccb->ccb_h.ccb_state = CD_CCB_PROBE;
            xpt_action(start_ccb);
            break;
      }
      }
}

static void
cddone(struct cam_periph *periph, union ccb *done_ccb)
{ 
      struct cd_softc *softc;
      struct ccb_scsiio *csio;

      CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("entering cddone\n"));

      softc = (struct cd_softc *)periph->softc;
      csio = &done_ccb->csio;

      switch (csio->ccb_h.ccb_state & CD_CCB_TYPE_MASK) {
      case CD_CCB_BUFFER_IO:
      {
            struct bio  *bp;
            int         error;

            bp = (struct bio *)done_ccb->ccb_h.ccb_bp;
            error = 0;

            if ((done_ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
                  int sf;

                  if ((done_ccb->ccb_h.ccb_state & CD_CCB_RETRY_UA) != 0)
                        sf = SF_RETRY_UA;
                  else
                        sf = 0;

                  error = cderror(done_ccb, CAM_RETRY_SELTO, sf);
                  if (error == ERESTART) {
                        /*
                         * A retry was scheuled, so
                         * just return.
                         */
                        return;
                  }
            }

            if (error != 0) {
                  xpt_print(periph->path,
                      "cddone: got error %#x back\n", error);
                  bioq_flush(&softc->bio_queue, NULL, EIO);
                  bp->bio_resid = bp->bio_bcount;
                  bp->bio_error = error;
                  bp->bio_flags |= BIO_ERROR;
                  cam_release_devq(done_ccb->ccb_h.path,
                               /*relsim_flags*/0,
                               /*reduction*/0,
                               /*timeout*/0,
                               /*getcount_only*/0);

            } else {
                  bp->bio_resid = csio->resid;
                  bp->bio_error = 0;
                  if (bp->bio_resid != 0) {
                        /*
                         * Short transfer ??? 
                         * XXX: not sure this is correct for partial
                         * transfers at EOM
                         */
                        bp->bio_flags |= BIO_ERROR;
                  }
            }

            LIST_REMOVE(&done_ccb->ccb_h, periph_links.le);
            softc->outstanding_cmds--;

            if (softc->flags & CD_FLAG_CHANGER)
                  cdchangerschedule(softc);

            biofinish(bp, NULL, 0);
            break;
      }
      case CD_CCB_PROBE:
      {
            struct         scsi_read_capacity_data *rdcap;
            char     announce_buf[120]; /*
                                     * Currently (9/30/97) the 
                                     * longest possible announce 
                                     * buffer is 108 bytes, for the 
                                     * first error case below.  
                                     * That is 39 bytes for the 
                                     * basic string, 16 bytes for the
                                     * biggest sense key (hardware 
                                     * error), 52 bytes for the
                                     * text of the largest sense 
                                     * qualifier valid for a CDROM,
                                     * (0x72, 0x03 or 0x04,
                                     * 0x03), and one byte for the
                                     * null terminating character.
                                     * To allow for longer strings, 
                                     * the announce buffer is 120
                                     * bytes.
                                     */
            struct         cd_params *cdp;

            cdp = &softc->params;

            rdcap = (struct scsi_read_capacity_data *)csio->data_ptr;
            
            cdp->disksize = scsi_4btoul (rdcap->addr) + 1;
            cdp->blksize = scsi_4btoul (rdcap->length);

            if ((csio->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP) {

                  snprintf(announce_buf, sizeof(announce_buf),
                        "cd present [%lu x %lu byte records]",
                        cdp->disksize, (u_long)cdp->blksize);

            } else {
                  int   error;
                  /*
                   * Retry any UNIT ATTENTION type errors.  They
                   * are expected at boot.
                   */
                  error = cderror(done_ccb, CAM_RETRY_SELTO,
                              SF_RETRY_UA | SF_NO_PRINT);
                  if (error == ERESTART) {
                        /*
                         * A retry was scheuled, so
                         * just return.
                         */
                        return;
                  } else if (error != 0) {

                        struct scsi_sense_data *sense;
                        int asc, ascq;
                        int sense_key, error_code;
                        int have_sense;
                        cam_status status;
                        struct ccb_getdev cgd;

                        /* Don't wedge this device's queue */
                        cam_release_devq(done_ccb->ccb_h.path,
                                     /*relsim_flags*/0,
                                     /*reduction*/0,
                                     /*timeout*/0,
                                     /*getcount_only*/0);

                        status = done_ccb->ccb_h.status;

                        xpt_setup_ccb(&cgd.ccb_h, 
                                    done_ccb->ccb_h.path,
                                    /* priority */ 1);
                        cgd.ccb_h.func_code = XPT_GDEV_TYPE;
                        xpt_action((union ccb *)&cgd);

                        if (((csio->ccb_h.flags & CAM_SENSE_PHYS) != 0)
                         || ((csio->ccb_h.flags & CAM_SENSE_PTR) != 0)
                         || ((status & CAM_AUTOSNS_VALID) == 0))
                              have_sense = FALSE;
                        else
                              have_sense = TRUE;

                        if (have_sense) {
                              sense = &csio->sense_data;
                              scsi_extract_sense(sense, &error_code,
                                             &sense_key, 
                                             &asc, &ascq);
                        }
                        /*
                         * Attach to anything that claims to be a
                         * CDROM or WORM device, as long as it
                         * doesn't return a "Logical unit not
                         * supported" (0x25) error.
                         */
                        if ((have_sense) && (asc != 0x25)
                         && (error_code == SSD_CURRENT_ERROR)) {
                              const char *sense_key_desc;
                              const char *asc_desc;

                              scsi_sense_desc(sense_key, asc, ascq,
                                          &cgd.inq_data,
                                          &sense_key_desc,
                                          &asc_desc);
                              snprintf(announce_buf,
                                  sizeof(announce_buf),
                                    "Attempt to query device "
                                    "size failed: %s, %s",
                                    sense_key_desc,
                                    asc_desc);
                        } else if ((have_sense == 0) 
                              && ((status & CAM_STATUS_MASK) ==
                                 CAM_SCSI_STATUS_ERROR)
                              && (csio->scsi_status ==
                                SCSI_STATUS_BUSY)) {
                              snprintf(announce_buf,
                                  sizeof(announce_buf),
                                  "Attempt to query device "
                                  "size failed: SCSI Status: %s",
                                  scsi_status_string(csio));
                        } else if (SID_TYPE(&cgd.inq_data) == T_CDROM) {
                              /*
                               * We only print out an error for
                               * CDROM type devices.  For WORM
                               * devices, we don't print out an
                               * error since a few WORM devices
                               * don't support CDROM commands.
                               * If we have sense information, go
                               * ahead and print it out.
                               * Otherwise, just say that we 
                               * couldn't attach.
                               */

                              /*
                               * Just print out the error, not
                               * the full probe message, when we
                               * don't attach.
                               */
                              if (have_sense)
                                    scsi_sense_print(
                                          &done_ccb->csio);
                              else {
                                    xpt_print(periph->path,
                                        "got CAM status %#x\n",
                                        done_ccb->ccb_h.status);
                              }
                              xpt_print(periph->path, "fatal error, "
                                  "failed to attach to device\n");
                              /*
                               * Invalidate this peripheral.
                               */
                              cam_periph_invalidate(periph);

                              announce_buf[0] = '\0';
                        } else {

                              /*
                               * Invalidate this peripheral.
                               */
                              cam_periph_invalidate(periph);
                              announce_buf[0] = '\0';
                        }
                  }
            }
            free(rdcap, M_SCSICD);
            if (announce_buf[0] != '\0') {
                  xpt_announce_periph(periph, announce_buf);
                  if (softc->flags & CD_FLAG_CHANGER)
                        cdchangerschedule(softc);
                  /*
                   * Create our sysctl variables, now that we know
                   * we have successfully attached.
                   */
                  taskqueue_enqueue(taskqueue_thread,&softc->sysctl_task);
            }
            softc->state = CD_STATE_NORMAL;           
            /*
             * Since our peripheral may be invalidated by an error
             * above or an external event, we must release our CCB
             * before releasing the probe lock on the peripheral.
             * The peripheral will only go away once the last lock
             * is removed, and we need it around for the CCB release
             * operation.
             */
            xpt_release_ccb(done_ccb);
            cam_periph_unhold(periph);
            return;
      }
      case CD_CCB_WAITING:
      {
            /* Caller will release the CCB */
            CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, 
                    ("trying to wakeup ccbwait\n"));

            wakeup(&done_ccb->ccb_h.cbfcnp);
            return;
      }
      default:
            break;
      }
      xpt_release_ccb(done_ccb);
}

static union cd_pages *
cdgetpage(struct cd_mode_params *mode_params)
{
      union cd_pages *page;

      if (mode_params->cdb_size == 10)
            page = (union cd_pages *)find_mode_page_10(
                  (struct scsi_mode_header_10 *)mode_params->mode_buf);
      else
            page = (union cd_pages *)find_mode_page_6(
                  (struct scsi_mode_header_6 *)mode_params->mode_buf);

      return (page);
}

static int
cdgetpagesize(int page_num)
{
      int i;

      for (i = 0; i < (sizeof(cd_page_size_table)/
           sizeof(cd_page_size_table[0])); i++) {
            if (cd_page_size_table[i].page == page_num)
                  return (cd_page_size_table[i].page_size);
      }

      return (-1);
}

static int
cdioctl(struct disk *dp, u_long cmd, void *addr, int flag, struct thread *td)
{

      struct      cam_periph *periph;
      struct      cd_softc *softc;
      int   nocopyout, error = 0;

      periph = (struct cam_periph *)dp->d_drv1;
      if (periph == NULL)
            return(ENXIO);    

      cam_periph_lock(periph);
      CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("entering cdioctl\n"));

      softc = (struct cd_softc *)periph->softc;

      CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, 
              ("trying to do ioctl %#lx\n", cmd));

      if ((error = cam_periph_hold(periph, PRIBIO | PCATCH)) != 0) {
            cam_periph_unlock(periph);
            cam_periph_release(periph);
            return (error);
      }

      /*
       * If we don't have media loaded, check for it.  If still don't
       * have media loaded, we can only do a load or eject.
       *
       * We only care whether media is loaded if this is a cd-specific ioctl
       * (thus the IOCGROUP check below).  Note that this will break if
       * anyone adds any ioctls into the switch statement below that don't
       * have their ioctl group set to 'c'.
       */
      if (((softc->flags & CD_FLAG_VALID_MEDIA) == 0)
       && ((cmd != CDIOCCLOSE)
        && (cmd != CDIOCEJECT))
       && (IOCGROUP(cmd) == 'c')) {
            error = cdcheckmedia(periph);
            if (error != 0) {
                  cam_periph_unhold(periph);
                  cam_periph_unlock(periph);
                  return (error);
            }
      }
      /*
       * Drop the lock here so later mallocs can use WAITOK.  The periph
       * is essentially locked still with the cam_periph_hold call above.
       */
      cam_periph_unlock(periph);

      nocopyout = 0;
      switch (cmd) {

      case CDIOCPLAYTRACKS:
            {
                  struct ioc_play_track *args
                      = (struct ioc_play_track *) addr;
                  struct cd_mode_params params;
                  union cd_pages *page;

                  params.alloc_len = sizeof(union cd_mode_data_6_10);
                  params.mode_buf = malloc(params.alloc_len, M_SCSICD,
                                     M_WAITOK | M_ZERO);

                  cam_periph_lock(periph);
                  CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 
                          ("trying to do CDIOCPLAYTRACKS\n"));

                  error = cdgetmode(periph, &params, AUDIO_PAGE);
                  if (error) {
                        free(params.mode_buf, M_SCSICD);
                        cam_periph_unlock(periph);
                        break;
                  }
                  page = cdgetpage(&params);

                  page->audio.flags &= ~CD_PA_SOTC;
                  page->audio.flags |= CD_PA_IMMED;
                  error = cdsetmode(periph, &params);
                  free(params.mode_buf, M_SCSICD);
                  if (error) {
                        cam_periph_unlock(periph);
                        break;
                  }

                  /*
                   * This was originally implemented with the PLAY
                   * AUDIO TRACK INDEX command, but that command was
                   * deprecated after SCSI-2.  Most (all?) SCSI CDROM
                   * drives support it but ATAPI and ATAPI-derivative
                   * drives don't seem to support it.  So we keep a
                   * cache of the table of contents and translate
                   * track numbers to MSF format.
                   */
                  if (softc->flags & CD_FLAG_VALID_TOC) {
                        union msf_lba *sentry, *eentry;
                        int st, et;

                        if (args->end_track <
                            softc->toc.header.ending_track + 1)
                              args->end_track++;
                        if (args->end_track >
                            softc->toc.header.ending_track + 1)
                              args->end_track =
                                  softc->toc.header.ending_track + 1;
                        st = args->start_track -
                              softc->toc.header.starting_track;
                        et = args->end_track -
                              softc->toc.header.starting_track;
                        if ((st < 0)
                         || (et < 0)
                         || (st > (softc->toc.header.ending_track -
                             softc->toc.header.starting_track))) {
                              error = EINVAL;
                              break;
                        }
                        sentry = &softc->toc.entries[st].addr;
                        eentry = &softc->toc.entries[et].addr;
                        error = cdplaymsf(periph,
                                      sentry->msf.minute,
                                      sentry->msf.second,
                                      sentry->msf.frame,
                                      eentry->msf.minute,
                                      eentry->msf.second,
                                      eentry->msf.frame);
                  } else {
                        /*
                         * If we don't have a valid TOC, try the
                         * play track index command.  It is part of
                         * the SCSI-2 spec, but was removed in the
                         * MMC specs.  ATAPI and ATAPI-derived
                         * drives don't support it.
                         */
                        if (softc->quirks & CD_Q_BCD_TRACKS) {
                              args->start_track =
                                    bin2bcd(args->start_track);
                              args->end_track =
                                    bin2bcd(args->end_track);
                        }
                        error = cdplaytracks(periph,
                                         args->start_track,
                                         args->start_index,
                                         args->end_track,
                                         args->end_index);
                  }
                  cam_periph_unlock(periph);
            }
            break;
      case CDIOCPLAYMSF:
            {
                  struct ioc_play_msf *args
                        = (struct ioc_play_msf *) addr;
                  struct cd_mode_params params;
                  union cd_pages *page;

                  params.alloc_len = sizeof(union cd_mode_data_6_10);
                  params.mode_buf = malloc(params.alloc_len, M_SCSICD,
                                     M_WAITOK | M_ZERO);

                  cam_periph_lock(periph);
                  CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 
                          ("trying to do CDIOCPLAYMSF\n"));

                  error = cdgetmode(periph, &params, AUDIO_PAGE);
                  if (error) {
                        free(params.mode_buf, M_SCSICD);
                        cam_periph_unlock(periph);
                        break;
                  }
                  page = cdgetpage(&params);

                  page->audio.flags &= ~CD_PA_SOTC;
                  page->audio.flags |= CD_PA_IMMED;
                  error = cdsetmode(periph, &params);
                  free(params.mode_buf, M_SCSICD);
                  if (error) {
                        cam_periph_unlock(periph);
                        break;
                  }
                  error = cdplaymsf(periph,
                                args->start_m,
                                args->start_s,
                                args->start_f,
                                args->end_m,
                                args->end_s,
                                args->end_f);
                  cam_periph_unlock(periph);
            }
            break;
      case CDIOCPLAYBLOCKS:
            {
                  struct ioc_play_blocks *args
                        = (struct ioc_play_blocks *) addr;
                  struct cd_mode_params params;
                  union cd_pages *page;

                  params.alloc_len = sizeof(union cd_mode_data_6_10);
                  params.mode_buf = malloc(params.alloc_len, M_SCSICD,
                                     M_WAITOK | M_ZERO);

                  cam_periph_lock(periph);
                  CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 
                          ("trying to do CDIOCPLAYBLOCKS\n"));


                  error = cdgetmode(periph, &params, AUDIO_PAGE);
                  if (error) {
                        free(params.mode_buf, M_SCSICD);
                        cam_periph_unlock(periph);
                        break;
                  }
                  page = cdgetpage(&params);

                  page->audio.flags &= ~CD_PA_SOTC;
                  page->audio.flags |= CD_PA_IMMED;
                  error = cdsetmode(periph, &params);
                  free(params.mode_buf, M_SCSICD);
                  if (error) {
                        cam_periph_unlock(periph);
                        break;
                  }
                  error = cdplay(periph, args->blk, args->len);
                  cam_periph_unlock(periph);
            }
            break;
      case CDIOCREADSUBCHANNEL_SYSSPACE:
            nocopyout = 1;
            /* Fallthrough */
      case CDIOCREADSUBCHANNEL:
            {
                  struct ioc_read_subchannel *args
                        = (struct ioc_read_subchannel *) addr;
                  struct cd_sub_channel_info *data;
                  u_int32_t len = args->data_len;

                  data = malloc(sizeof(struct cd_sub_channel_info), 
                              M_SCSICD, M_WAITOK);

                  cam_periph_lock(periph);
                  CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 
                          ("trying to do CDIOCREADSUBCHANNEL\n"));

                  if ((len > sizeof(struct cd_sub_channel_info)) ||
                      (len < sizeof(struct cd_sub_channel_header))) {
                        printf(
                              "scsi_cd: cdioctl: "
                              "cdioreadsubchannel: error, len=%d\n",
                              len);
                        error = EINVAL;
                        free(data, M_SCSICD);
                        cam_periph_unlock(periph);
                        break;
                  }

                  if (softc->quirks & CD_Q_BCD_TRACKS)
                        args->track = bin2bcd(args->track);

                  error = cdreadsubchannel(periph, args->address_format,
                        args->data_format, args->track, data, len);

                  if (error) {
                        free(data, M_SCSICD);
                        cam_periph_unlock(periph);
                        break;
                  }
                  if (softc->quirks & CD_Q_BCD_TRACKS)
                        data->what.track_info.track_number =
                            bcd2bin(data->what.track_info.track_number);
                  len = min(len, ((data->header.data_len[0] << 8) +
                        data->header.data_len[1] +
                        sizeof(struct cd_sub_channel_header)));
                  cam_periph_unlock(periph);
                  if (nocopyout == 0) {
                        if (copyout(data, args->data, len) != 0) {
                              error = EFAULT;
                        }
                  } else {
                        bcopy(data, args->data, len);
                  }
                  free(data, M_SCSICD);
            }
            break;

      case CDIOREADTOCHEADER:
            {
                  struct ioc_toc_header *th;

                  th = malloc(sizeof(struct ioc_toc_header), M_SCSICD,
                            M_WAITOK);

                  cam_periph_lock(periph);
                  CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 
                          ("trying to do CDIOREADTOCHEADER\n"));

                  error = cdreadtoc(periph, 0, 0, (u_int8_t *)th, 
                                  sizeof (*th), /*sense_flags*/0);
                  if (error) {
                        free(th, M_SCSICD);
                        cam_periph_unlock(periph);
                        break;
                  }
                  if (softc->quirks & CD_Q_BCD_TRACKS) {
                        /* we are going to have to convert the BCD
                         * encoding on the cd to what is expected
                         */
                        th->starting_track = 
                              bcd2bin(th->starting_track);
                        th->ending_track = bcd2bin(th->ending_track);
                  }
                  th->len = ntohs(th->len);
                  bcopy(th, addr, sizeof(*th));
                  free(th, M_SCSICD);
                  cam_periph_unlock(periph);
            }
            break;
      case CDIOREADTOCENTRYS:
            {
                  struct cd_tocdata *data;
                  struct cd_toc_single *lead;
                  struct ioc_read_toc_entry *te =
                        (struct ioc_read_toc_entry *) addr;
                  struct ioc_toc_header *th;
                  u_int32_t len, readlen, idx, num;
                  u_int32_t starting_track = te->starting_track;

                  data = malloc(sizeof(*data), M_SCSICD, M_WAITOK);
                  lead = malloc(sizeof(*lead), M_SCSICD, M_WAITOK);

                  cam_periph_lock(periph);
                  CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 
                          ("trying to do CDIOREADTOCENTRYS\n"));

                  if (te->data_len < sizeof(struct cd_toc_entry)
                   || (te->data_len % sizeof(struct cd_toc_entry)) != 0
                   || (te->address_format != CD_MSF_FORMAT
                    && te->address_format != CD_LBA_FORMAT)) {
                        error = EINVAL;
                        printf("scsi_cd: error in readtocentries, "
                               "returning EINVAL\n");
                        free(data, M_SCSICD);
                        free(lead, M_SCSICD);
                        cam_periph_unlock(periph);
                        break;
                  }

                  th = &data->header;
                  error = cdreadtoc(periph, 0, 0, (u_int8_t *)th, 
                                sizeof (*th), /*sense_flags*/0);
                  if (error) {
                        free(data, M_SCSICD);
                        free(lead, M_SCSICD);
                        cam_periph_unlock(periph);
                        break;
                  }

                  if (softc->quirks & CD_Q_BCD_TRACKS) {
                        /* we are going to have to convert the BCD
                         * encoding on the cd to what is expected
                         */
                        th->starting_track =
                            bcd2bin(th->starting_track);
                        th->ending_track = bcd2bin(th->ending_track);
                  }

                  if (starting_track == 0)
                        starting_track = th->starting_track;
                  else if (starting_track == LEADOUT)
                        starting_track = th->ending_track + 1;
                  else if (starting_track < th->starting_track ||
                         starting_track > th->ending_track + 1) {
                        printf("scsi_cd: error in readtocentries, "
                               "returning EINVAL\n");
                        free(data, M_SCSICD);
                        free(lead, M_SCSICD);
                        cam_periph_unlock(periph);
                        error = EINVAL;
                        break;
                  }

                  /* calculate reading length without leadout entry */
                  readlen = (th->ending_track - starting_track + 1) *
                          sizeof(struct cd_toc_entry);

                  /* and with leadout entry */
                  len = readlen + sizeof(struct cd_toc_entry);
                  if (te->data_len < len) {
                        len = te->data_len;
                        if (readlen > len)
                              readlen = len;
                  }
                  if (len > sizeof(data->entries)) {
                        printf("scsi_cd: error in readtocentries, "
                               "returning EINVAL\n");
                        error = EINVAL;
                        free(data, M_SCSICD);
                        free(lead, M_SCSICD);
                        cam_periph_unlock(periph);
                        break;
                  }
                  num = len / sizeof(struct cd_toc_entry);

                  if (readlen > 0) {
                        error = cdreadtoc(periph, te->address_format,
                                      starting_track,
                                      (u_int8_t *)data,
                                      readlen + sizeof (*th),
                                      /*sense_flags*/0);
                        if (error) {
                              free(data, M_SCSICD);
                              free(lead, M_SCSICD);
                              cam_periph_unlock(periph);
                              break;
                        }
                  }

                  /* make leadout entry if needed */
                  idx = starting_track + num - 1;
                  if (softc->quirks & CD_Q_BCD_TRACKS)
                        th->ending_track = bcd2bin(th->ending_track);
                  if (idx == th->ending_track + 1) {
                        error = cdreadtoc(periph, te->address_format,
                                      LEADOUT, (u_int8_t *)lead,
                                      sizeof(*lead),
                                      /*sense_flags*/0);
                        if (error) {
                              free(data, M_SCSICD);
                              free(lead, M_SCSICD);
                              cam_periph_unlock(periph);
                              break;
                        }
                        data->entries[idx - starting_track] = 
                              lead->entry;
                  }
                  if (softc->quirks & CD_Q_BCD_TRACKS) {
                        for (idx = 0; idx < num - 1; idx++) {
                              data->entries[idx].track =
                                  bcd2bin(data->entries[idx].track);
                        }
                  }

                  cam_periph_unlock(periph);
                  error = copyout(data->entries, te->data, len);
                  free(data, M_SCSICD);
                  free(lead, M_SCSICD);
            }
            break;
      case CDIOREADTOCENTRY:
            {
                  struct cd_toc_single *data;
                  struct ioc_read_toc_single_entry *te =
                        (struct ioc_read_toc_single_entry *) addr;
                  struct ioc_toc_header *th;
                  u_int32_t track;

                  data = malloc(sizeof(*data), M_SCSICD, M_WAITOK);

                  cam_periph_lock(periph);
                  CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 
                          ("trying to do CDIOREADTOCENTRY\n"));

                  if (te->address_format != CD_MSF_FORMAT
                      && te->address_format != CD_LBA_FORMAT) {
                        printf("error in readtocentry, "
                               " returning EINVAL\n");
                        free(data, M_SCSICD);
                        error = EINVAL;
                        cam_periph_unlock(periph);
                        break;
                  }

                  th = &data->header;
                  error = cdreadtoc(periph, 0, 0, (u_int8_t *)th,
                                sizeof (*th), /*sense_flags*/0);
                  if (error) {
                        free(data, M_SCSICD);
                        cam_periph_unlock(periph);
                        break;
                  }

                  if (softc->quirks & CD_Q_BCD_TRACKS) {
                        /* we are going to have to convert the BCD
                         * encoding on the cd to what is expected
                         */
                        th->starting_track =
                            bcd2bin(th->starting_track);
                        th->ending_track = bcd2bin(th->ending_track);
                  }
                  track = te->track;
                  if (track == 0)
                        track = th->starting_track;
                  else if (track == LEADOUT)
                        /* OK */;
                  else if (track < th->starting_track ||
                         track > th->ending_track + 1) {
                        printf("error in readtocentry, "
                               " returning EINVAL\n");
                        free(data, M_SCSICD);
                        error = EINVAL;
                        cam_periph_unlock(periph);
                        break;
                  }

                  error = cdreadtoc(periph, te->address_format, track,
                                (u_int8_t *)data, sizeof(*data),
                                /*sense_flags*/0);
                  if (error) {
                        free(data, M_SCSICD);
                        cam_periph_unlock(periph);
                        break;
                  }

                  if (softc->quirks & CD_Q_BCD_TRACKS)
                        data->entry.track = bcd2bin(data->entry.track);
                  bcopy(&data->entry, &te->entry,
                        sizeof(struct cd_toc_entry));
                  free(data, M_SCSICD);
                  cam_periph_unlock(periph);
            }
            break;
      case CDIOCSETPATCH:
            {
                  struct ioc_patch *arg = (struct ioc_patch *)addr;
                  struct cd_mode_params params;
                  union cd_pages *page;

                  params.alloc_len = sizeof(union cd_mode_data_6_10);
                  params.mode_buf = malloc(params.alloc_len, M_SCSICD, 
                                     M_WAITOK | M_ZERO);

                  cam_periph_lock(periph);
                  CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 
                          ("trying to do CDIOCSETPATCH\n"));

                  error = cdgetmode(periph, &params, AUDIO_PAGE);
                  if (error) {
                        free(params.mode_buf, M_SCSICD);
                        cam_periph_unlock(periph);
                        break;
                  }
                  page = cdgetpage(&params);

                  page->audio.port[LEFT_PORT].channels = 
                        arg->patch[0];
                  page->audio.port[RIGHT_PORT].channels = 
                        arg->patch[1];
                  page->audio.port[2].channels = arg->patch[2];
                  page->audio.port[3].channels = arg->patch[3];
                  error = cdsetmode(periph, &params);
                  free(params.mode_buf, M_SCSICD);
                  cam_periph_unlock(periph);
            }
            break;
      case CDIOCGETVOL:
            {
                  struct ioc_vol *arg = (struct ioc_vol *) addr;
                  struct cd_mode_params params;
                  union cd_pages *page;

                  params.alloc_len = sizeof(union cd_mode_data_6_10);
                  params.mode_buf = malloc(params.alloc_len, M_SCSICD, 
                                     M_WAITOK | M_ZERO);

                  cam_periph_lock(periph);
                  CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 
                          ("trying to do CDIOCGETVOL\n"));

                  error = cdgetmode(periph, &params, AUDIO_PAGE);
                  if (error) {
                        free(params.mode_buf, M_SCSICD);
                        cam_periph_unlock(periph);
                        break;
                  }
                  page = cdgetpage(&params);

                  arg->vol[LEFT_PORT] = 
                        page->audio.port[LEFT_PORT].volume;
                  arg->vol[RIGHT_PORT] = 
                        page->audio.port[RIGHT_PORT].volume;
                  arg->vol[2] = page->audio.port[2].volume;
                  arg->vol[3] = page->audio.port[3].volume;
                  free(params.mode_buf, M_SCSICD);
                  cam_periph_unlock(periph);
            }
            break;
      case CDIOCSETVOL:
            {
                  struct ioc_vol *arg = (struct ioc_vol *) addr;
                  struct cd_mode_params params;
                  union cd_pages *page;

                  params.alloc_len = sizeof(union cd_mode_data_6_10);
                  params.mode_buf = malloc(params.alloc_len, M_SCSICD, 
                                     M_WAITOK | M_ZERO);

                  cam_periph_lock(periph);
                  CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 
                          ("trying to do CDIOCSETVOL\n"));

                  error = cdgetmode(periph, &params, AUDIO_PAGE);
                  if (error) {
                        free(params.mode_buf, M_SCSICD);
                        cam_periph_unlock(periph);
                        break;
                  }
                  page = cdgetpage(&params);

                  page->audio.port[LEFT_PORT].channels = CHANNEL_0;
                  page->audio.port[LEFT_PORT].volume = 
                        arg->vol[LEFT_PORT];
                  page->audio.port[RIGHT_PORT].channels = CHANNEL_1;
                  page->audio.port[RIGHT_PORT].volume = 
                        arg->vol[RIGHT_PORT];
                  page->audio.port[2].volume = arg->vol[2];
                  page->audio.port[3].volume = arg->vol[3];
                  error = cdsetmode(periph, &params);
                  cam_periph_unlock(periph);
                  free(params.mode_buf, M_SCSICD);
            }
            break;
      case CDIOCSETMONO:
            {
                  struct cd_mode_params params;
                  union cd_pages *page;

                  params.alloc_len = sizeof(union cd_mode_data_6_10);
                  params.mode_buf = malloc(params.alloc_len, M_SCSICD,
                                     M_WAITOK | M_ZERO);

                  cam_periph_lock(periph);
                  CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 
                          ("trying to do CDIOCSETMONO\n"));

                  error = cdgetmode(periph, &params, AUDIO_PAGE);
                  if (error) {
                        free(params.mode_buf, M_SCSICD);
                        cam_periph_unlock(periph);
                        break;
                  }
                  page = cdgetpage(&params);

                  page->audio.port[LEFT_PORT].channels = 
                        LEFT_CHANNEL | RIGHT_CHANNEL;
                  page->audio.port[RIGHT_PORT].channels = 
                        LEFT_CHANNEL | RIGHT_CHANNEL;
                  page->audio.port[2].channels = 0;
                  page->audio.port[3].channels = 0;
                  error = cdsetmode(periph, &params);
                  cam_periph_unlock(periph);
                  free(params.mode_buf, M_SCSICD);
            }
            break;
      case CDIOCSETSTEREO:
            {
                  struct cd_mode_params params;
                  union cd_pages *page;

                  params.alloc_len = sizeof(union cd_mode_data_6_10);
                  params.mode_buf = malloc(params.alloc_len, M_SCSICD,
                                     M_WAITOK | M_ZERO);

                  cam_periph_lock(periph);
                  CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 
                          ("trying to do CDIOCSETSTEREO\n"));

                  error = cdgetmode(periph, &params, AUDIO_PAGE);
                  if (error) {
                        free(params.mode_buf, M_SCSICD);
                        cam_periph_unlock(periph);
                        break;
                  }
                  page = cdgetpage(&params);

                  page->audio.port[LEFT_PORT].channels = 
                        LEFT_CHANNEL;
                  page->audio.port[RIGHT_PORT].channels = 
                        RIGHT_CHANNEL;
                  page->audio.port[2].channels = 0;
                  page->audio.port[3].channels = 0;
                  error = cdsetmode(periph, &params);
                  free(params.mode_buf, M_SCSICD);
                  cam_periph_unlock(periph);
            }
            break;
      case CDIOCSETMUTE:
            {
                  struct cd_mode_params params;
                  union cd_pages *page;

                  params.alloc_len = sizeof(union cd_mode_data_6_10);
                  params.mode_buf = malloc(params.alloc_len, M_SCSICD,
                                     M_WAITOK | M_ZERO);

                  cam_periph_lock(periph);
                  CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 
                          ("trying to do CDIOCSETMUTE\n"));

                  error = cdgetmode(periph, &params, AUDIO_PAGE);
                  if (error) {
                        free(&params, M_SCSICD);
                        cam_periph_unlock(periph);
                        break;
                  }
                  page = cdgetpage(&params);

                  page->audio.port[LEFT_PORT].channels = 0;
                  page->audio.port[RIGHT_PORT].channels = 0;
                  page->audio.port[2].channels = 0;
                  page->audio.port[3].channels = 0;
                  error = cdsetmode(periph, &params);
                  free(params.mode_buf, M_SCSICD);
                  cam_periph_unlock(periph);
            }
            break;
      case CDIOCSETLEFT:
            {
                  struct cd_mode_params params;
                  union cd_pages *page;

                  params.alloc_len = sizeof(union cd_mode_data_6_10);
                  params.mode_buf = malloc(params.alloc_len, M_SCSICD,
                                     M_WAITOK | M_ZERO);

                  cam_periph_lock(periph);
                  CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 
                          ("trying to do CDIOCSETLEFT\n"));

                  error = cdgetmode(periph, &params, AUDIO_PAGE);
                  if (error) {
                        free(params.mode_buf, M_SCSICD);
                        cam_periph_unlock(periph);
                        break;
                  }
                  page = cdgetpage(&params);

                  page->audio.port[LEFT_PORT].channels = LEFT_CHANNEL;
                  page->audio.port[RIGHT_PORT].channels = LEFT_CHANNEL;
                  page->audio.port[2].channels = 0;
                  page->audio.port[3].channels = 0;
                  error = cdsetmode(periph, &params);
                  free(params.mode_buf, M_SCSICD);
                  cam_periph_unlock(periph);
            }
            break;
      case CDIOCSETRIGHT:
            {
                  struct cd_mode_params params;
                  union cd_pages *page;

                  params.alloc_len = sizeof(union cd_mode_data_6_10);
                  params.mode_buf = malloc(params.alloc_len, M_SCSICD,
                                     M_WAITOK | M_ZERO);

                  cam_periph_lock(periph);
                  CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 
                          ("trying to do CDIOCSETRIGHT\n"));

                  error = cdgetmode(periph, &params, AUDIO_PAGE);
                  if (error) {
                        free(params.mode_buf, M_SCSICD);
                        cam_periph_unlock(periph);
                        break;
                  }
                  page = cdgetpage(&params);

                  page->audio.port[LEFT_PORT].channels = RIGHT_CHANNEL;
                  page->audio.port[RIGHT_PORT].channels = RIGHT_CHANNEL;
                  page->audio.port[2].channels = 0;
                  page->audio.port[3].channels = 0;
                  error = cdsetmode(periph, &params);
                  free(params.mode_buf, M_SCSICD);
                  cam_periph_unlock(periph);
            }
            break;
      case CDIOCRESUME:
            cam_periph_lock(periph);
            error = cdpause(periph, 1);
            cam_periph_unlock(periph);
            break;
      case CDIOCPAUSE:
            cam_periph_lock(periph);
            error = cdpause(periph, 0);
            cam_periph_unlock(periph);
            break;
      case CDIOCSTART:
            cam_periph_lock(periph);
            error = cdstartunit(periph, 0);
            cam_periph_unlock(periph);
            break;
      case CDIOCCLOSE:
            cam_periph_lock(periph);
            error = cdstartunit(periph, 1);
            cam_periph_unlock(periph);
            break;
      case CDIOCSTOP:
            cam_periph_lock(periph);
            error = cdstopunit(periph, 0);
            cam_periph_unlock(periph);
            break;
      case CDIOCEJECT:
            cam_periph_lock(periph);
            error = cdstopunit(periph, 1);
            cam_periph_unlock(periph);
            break;
      case CDIOCALLOW:
            cam_periph_lock(periph);
            cdprevent(periph, PR_ALLOW);
            cam_periph_unlock(periph);
            break;
      case CDIOCPREVENT:
            cam_periph_lock(periph);
            cdprevent(periph, PR_PREVENT);
            cam_periph_unlock(periph);
            break;
      case CDIOCSETDEBUG:
            /* sc_link->flags |= (SDEV_DB1 | SDEV_DB2); */
            error = ENOTTY;
            break;
      case CDIOCCLRDEBUG:
            /* sc_link->flags &= ~(SDEV_DB1 | SDEV_DB2); */
            error = ENOTTY;
            break;
      case CDIOCRESET:
            /* return (cd_reset(periph)); */
            error = ENOTTY;
            break;
      case CDRIOCREADSPEED:
            cam_periph_lock(periph);
            error = cdsetspeed(periph, *(u_int32_t *)addr, CDR_MAX_SPEED);
            cam_periph_unlock(periph);
            break;
      case CDRIOCWRITESPEED:
            cam_periph_lock(periph);
            error = cdsetspeed(periph, CDR_MAX_SPEED, *(u_int32_t *)addr);
            cam_periph_unlock(periph);
            break;
      case DVDIOCSENDKEY:
      case DVDIOCREPORTKEY: {
            struct dvd_authinfo *authinfo;

            authinfo = (struct dvd_authinfo *)addr;

            cam_periph_lock(periph);
            if (cmd == DVDIOCREPORTKEY)
                  error = cdreportkey(periph, authinfo);
            else
                  error = cdsendkey(periph, authinfo);
            cam_periph_unlock(periph);
            break;
            }
      case DVDIOCREADSTRUCTURE: {
            struct dvd_struct *dvdstruct;

            dvdstruct = (struct dvd_struct *)addr;

            cam_periph_lock(periph);
            error = cdreaddvdstructure(periph, dvdstruct);
            cam_periph_unlock(periph);

            break;
      }
      default:
            cam_periph_lock(periph);
            error = cam_periph_ioctl(periph, cmd, addr, cderror);
            cam_periph_unlock(periph);
            break;
      }

      cam_periph_lock(periph);
      cam_periph_unhold(periph);
      
      CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("leaving cdioctl\n"));
      if (error && bootverbose) {
            printf("scsi_cd.c::ioctl cmd=%08lx error=%d\n", cmd, error);
      }
      cam_periph_unlock(periph);

      return (error);
}

static void
cdprevent(struct cam_periph *periph, int action)
{
      union ccb *ccb;
      struct      cd_softc *softc;
      int   error;

      CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("entering cdprevent\n"));

      softc = (struct cd_softc *)periph->softc;
      
      if (((action == PR_ALLOW)
        && (softc->flags & CD_FLAG_DISC_LOCKED) == 0)
       || ((action == PR_PREVENT)
        && (softc->flags & CD_FLAG_DISC_LOCKED) != 0)) {
            return;
      }
          
      ccb = cdgetccb(periph, /* priority */ 1);

      scsi_prevent(&ccb->csio, 
                 /*retries*/ 1,
                 cddone,
                 MSG_SIMPLE_Q_TAG,
                 action,
                 SSD_FULL_SIZE,
                 /* timeout */60000);
      
      error = cdrunccb(ccb, cderror, /*cam_flags*/CAM_RETRY_SELTO,
                  /*sense_flags*/SF_RETRY_UA|SF_NO_PRINT);

      xpt_release_ccb(ccb);

      if (error == 0) {
            if (action == PR_ALLOW)
                  softc->flags &= ~CD_FLAG_DISC_LOCKED;
            else
                  softc->flags |= CD_FLAG_DISC_LOCKED;
      }
}

/*
 * XXX: the disk media and sector size is only really able to change
 * XXX: while the device is closed.
 */
static int
cdcheckmedia(struct cam_periph *periph)
{
      struct cd_softc *softc;
      struct ioc_toc_header *toch;
      struct cd_toc_single leadout;
      u_int32_t size, toclen;
      int error, num_entries, cdindex;

      softc = (struct cd_softc *)periph->softc;

      cdprevent(periph, PR_PREVENT);
      softc->disk->d_maxsize = DFLTPHYS;
      softc->disk->d_sectorsize = 2048;
      softc->disk->d_mediasize = 0;

      /*
       * Get the disc size and block size.  If we can't get it, we don't
       * have media, most likely.
       */
      if ((error = cdsize(periph, &size)) != 0) {
            softc->flags &= ~(CD_FLAG_VALID_MEDIA|CD_FLAG_VALID_TOC);
            cdprevent(periph, PR_ALLOW);
            return (error);
      } else
            softc->flags |= CD_FLAG_VALID_MEDIA;

      /*
       * Now we check the table of contents.  This (currently) is only
       * used for the CDIOCPLAYTRACKS ioctl.  It may be used later to do
       * things like present a separate entry in /dev for each track,
       * like that acd(4) driver does.
       */
      bzero(&softc->toc, sizeof(softc->toc));
      toch = &softc->toc.header;
      /*
       * We will get errors here for media that doesn't have a table of
       * contents.  According to the MMC-3 spec: "When a Read TOC/PMA/ATIP
       * command is presented for a DDCD/CD-R/RW media, where the first TOC
       * has not been recorded (no complete session) and the Format codes
       * 0000b, 0001b, or 0010b are specified, this command shall be rejected
       * with an INVALID FIELD IN CDB.  Devices that are not capable of
       * reading an incomplete session on DDC/CD-R/RW media shall report
       * CANNOT READ MEDIUM - INCOMPATIBLE FORMAT."
       *
       * So this isn't fatal if we can't read the table of contents, it
       * just means that the user won't be able to issue the play tracks
       * ioctl, and likely lots of other stuff won't work either.  They
       * need to burn the CD before we can do a whole lot with it.  So
       * we don't print anything here if we get an error back.
       */
      error = cdreadtoc(periph, 0, 0, (u_int8_t *)toch, sizeof(*toch),
                    SF_NO_PRINT);
      /*
       * Errors in reading the table of contents aren't fatal, we just
       * won't have a valid table of contents cached.
       */
      if (error != 0) {
            error = 0;
            bzero(&softc->toc, sizeof(softc->toc));
            goto bailout;
      }

      if (softc->quirks & CD_Q_BCD_TRACKS) {
            toch->starting_track = bcd2bin(toch->starting_track);
            toch->ending_track = bcd2bin(toch->ending_track);
      }

      /* Number of TOC entries, plus leadout */
      num_entries = (toch->ending_track - toch->starting_track) + 2;

      if (num_entries <= 0)
            goto bailout;

      toclen = num_entries * sizeof(struct cd_toc_entry);

      error = cdreadtoc(periph, CD_MSF_FORMAT, toch->starting_track,
                    (u_int8_t *)&softc->toc, toclen + sizeof(*toch),
                    SF_NO_PRINT);
      if (error != 0) {
            error = 0;
            bzero(&softc->toc, sizeof(softc->toc));
            goto bailout;
      }

      if (softc->quirks & CD_Q_BCD_TRACKS) {
            toch->starting_track = bcd2bin(toch->starting_track);
            toch->ending_track = bcd2bin(toch->ending_track);
      }
      /*
       * XXX KDM is this necessary?  Probably only if the drive doesn't
       * return leadout information with the table of contents.
       */
      cdindex = toch->starting_track + num_entries -1;
      if (cdindex == toch->ending_track + 1) {

            error = cdreadtoc(periph, CD_MSF_FORMAT, LEADOUT, 
                          (u_int8_t *)&leadout, sizeof(leadout),
                          SF_NO_PRINT);
            if (error != 0) {
                  error = 0;
                  goto bailout;
            }
            softc->toc.entries[cdindex - toch->starting_track] =
                  leadout.entry;
      }
      if (softc->quirks & CD_Q_BCD_TRACKS) {
            for (cdindex = 0; cdindex < num_entries - 1; cdindex++) {
                  softc->toc.entries[cdindex].track =
                        bcd2bin(softc->toc.entries[cdindex].track);
            }
      }

      softc->flags |= CD_FLAG_VALID_TOC;
      softc->disk->d_maxsize = DFLTPHYS;
      softc->disk->d_sectorsize = softc->params.blksize;
      softc->disk->d_mediasize =
          (off_t)softc->params.blksize * softc->params.disksize;

bailout:

      /*
       * We unconditionally (re)set the blocksize each time the
       * CD device is opened.  This is because the CD can change,
       * and therefore the blocksize might change.
       * XXX problems here if some slice or partition is still
       * open with the old size?
       */
      if ((softc->disk->d_devstat->flags & DEVSTAT_BS_UNAVAILABLE) != 0)
            softc->disk->d_devstat->flags &= ~DEVSTAT_BS_UNAVAILABLE;
      softc->disk->d_devstat->block_size = softc->params.blksize;

      return (error);
}

static int
cdsize(struct cam_periph *periph, u_int32_t *size)
{
      struct cd_softc *softc;
      union ccb *ccb;
      struct scsi_read_capacity_data *rcap_buf;
      int error;

      CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("entering cdsize\n"));

      softc = (struct cd_softc *)periph->softc;
             
      ccb = cdgetccb(periph, /* priority */ 1);

      /* XXX Should be M_WAITOK */
      rcap_buf = malloc(sizeof(struct scsi_read_capacity_data), 
                    M_SCSICD, M_NOWAIT);
      if (rcap_buf == NULL)
            return (ENOMEM);

      scsi_read_capacity(&ccb->csio, 
                     /*retries*/ 1,
                     cddone,
                     MSG_SIMPLE_Q_TAG,
                     rcap_buf,
                     SSD_FULL_SIZE,
                     /* timeout */20000);

      error = cdrunccb(ccb, cderror, /*cam_flags*/CAM_RETRY_SELTO,
                   /*sense_flags*/SF_RETRY_UA|SF_NO_PRINT);

      xpt_release_ccb(ccb);

      softc->params.disksize = scsi_4btoul(rcap_buf->addr) + 1;
      softc->params.blksize  = scsi_4btoul(rcap_buf->length);
      /*
       * SCSI-3 mandates that the reported blocksize shall be 2048.
       * Older drives sometimes report funny values, trim it down to
       * 2048, or other parts of the kernel will get confused.
       *
       * XXX we leave drives alone that might report 512 bytes, as
       * well as drives reporting more weird sizes like perhaps 4K.
       */
      if (softc->params.blksize > 2048 && softc->params.blksize <= 2352)
            softc->params.blksize = 2048;

      free(rcap_buf, M_SCSICD);
      *size = softc->params.disksize;

      return (error);

}

static int
cd6byteworkaround(union ccb *ccb)
{
      u_int8_t *cdb;
      struct cam_periph *periph;
      struct cd_softc *softc;
      struct cd_mode_params *params;
      int frozen, found;

      periph = xpt_path_periph(ccb->ccb_h.path);
      softc = (struct cd_softc *)periph->softc;

      cdb = ccb->csio.cdb_io.cdb_bytes;

      if ((ccb->ccb_h.flags & CAM_CDB_POINTER)
       || ((cdb[0] != MODE_SENSE_6)
        && (cdb[0] != MODE_SELECT_6)))
            return (0);

      /*
       * Because there is no convenient place to stash the overall
       * cd_mode_params structure pointer, we have to grab it like this.
       * This means that ALL MODE_SENSE and MODE_SELECT requests in the
       * cd(4) driver MUST go through cdgetmode() and cdsetmode()!
       *
       * XXX It would be nice if, at some point, we could increase the
       * number of available peripheral private pointers.  Both pointers
       * are currently used in most every peripheral driver.
       */
      found = 0;

      STAILQ_FOREACH(params, &softc->mode_queue, links) {
            if (params->mode_buf == ccb->csio.data_ptr) {
                  found = 1;
                  break;
            }
      }

      /*
       * This shouldn't happen.  All mode sense and mode select
       * operations in the cd(4) driver MUST go through cdgetmode() and
       * cdsetmode()!
       */
      if (found == 0) {
            xpt_print(periph->path,
                "mode buffer not found in mode queue!\n");
            return (0);
      }

      params->cdb_size = 10;
      softc->minimum_command_size = 10;
      xpt_print(ccb->ccb_h.path,
          "%s(6) failed, increasing minimum CDB size to 10 bytes\n",
          (cdb[0] == MODE_SENSE_6) ? "MODE_SENSE" : "MODE_SELECT");

      if (cdb[0] == MODE_SENSE_6) {
            struct scsi_mode_sense_10 ms10;
            struct scsi_mode_sense_6 *ms6;
            int len;

            ms6 = (struct scsi_mode_sense_6 *)cdb;

            bzero(&ms10, sizeof(ms10));
            ms10.opcode = MODE_SENSE_10;
            ms10.byte2 = ms6->byte2;
            ms10.page = ms6->page;

            /*
             * 10 byte mode header, block descriptor,
             * sizeof(union cd_pages)
             */
            len = sizeof(struct cd_mode_data_10);
            ccb->csio.dxfer_len = len;

            scsi_ulto2b(len, ms10.length);
            ms10.control = ms6->control;
            bcopy(&ms10, cdb, 10);
            ccb->csio.cdb_len = 10;
      } else {
            struct scsi_mode_select_10 ms10;
            struct scsi_mode_select_6 *ms6;
            struct scsi_mode_header_6 *header6;
            struct scsi_mode_header_10 *header10;
            struct scsi_mode_page_header *page_header;
            int blk_desc_len, page_num, page_size, len;

            ms6 = (struct scsi_mode_select_6 *)cdb;

            bzero(&ms10, sizeof(ms10));
            ms10.opcode = MODE_SELECT_10;
            ms10.byte2 = ms6->byte2;

            header6 = (struct scsi_mode_header_6 *)params->mode_buf;
            header10 = (struct scsi_mode_header_10 *)params->mode_buf;

            page_header = find_mode_page_6(header6);
            page_num = page_header->page_code;

            blk_desc_len = header6->blk_desc_len;

            page_size = cdgetpagesize(page_num);

            if (page_size != (page_header->page_length +
                sizeof(*page_header)))
                  page_size = page_header->page_length +
                        sizeof(*page_header);

            len = sizeof(*header10) + blk_desc_len + page_size;

            len = min(params->alloc_len, len);

            /*
             * Since the 6 byte parameter header is shorter than the 10
             * byte parameter header, we need to copy the actual mode
             * page data, and the block descriptor, if any, so things wind
             * up in the right place.  The regions will overlap, but
             * bcopy() does the right thing.
             */
            bcopy(params->mode_buf + sizeof(*header6),
                  params->mode_buf + sizeof(*header10),
                  len - sizeof(*header10));

            /* Make sure these fields are set correctly. */
            scsi_ulto2b(0, header10->data_length);
            header10->medium_type = 0;
            scsi_ulto2b(blk_desc_len, header10->blk_desc_len);

            ccb->csio.dxfer_len = len;

            scsi_ulto2b(len, ms10.length);
            ms10.control = ms6->control;
            bcopy(&ms10, cdb, 10);
            ccb->csio.cdb_len = 10;
      }

      frozen = (ccb->ccb_h.status & CAM_DEV_QFRZN) != 0;
      ccb->ccb_h.status = CAM_REQUEUE_REQ;
      xpt_action(ccb);
      if (frozen) {
            cam_release_devq(ccb->ccb_h.path,
                         /*relsim_flags*/0,
                         /*openings*/0,
                         /*timeout*/0,
                         /*getcount_only*/0);
      }

      return (ERESTART);
}

static int
cderror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
{
      struct cd_softc *softc;
      struct cam_periph *periph;
      int error;

      periph = xpt_path_periph(ccb->ccb_h.path);
      softc = (struct cd_softc *)periph->softc;

      error = 0;

      /*
       * We use a status of CAM_REQ_INVALID as shorthand -- if a 6 byte
       * CDB comes back with this particular error, try transforming it
       * into the 10 byte version.
       */
      if ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_INVALID) {
            error = cd6byteworkaround(ccb);
      } else if (((ccb->ccb_h.status & CAM_STATUS_MASK) ==
                 CAM_SCSI_STATUS_ERROR)
       && (ccb->ccb_h.status & CAM_AUTOSNS_VALID)
       && (ccb->csio.scsi_status == SCSI_STATUS_CHECK_COND)
       && ((ccb->ccb_h.flags & CAM_SENSE_PHYS) == 0)
       && ((ccb->ccb_h.flags & CAM_SENSE_PTR) == 0)) {
            int sense_key, error_code, asc, ascq;

            scsi_extract_sense(&ccb->csio.sense_data,
                           &error_code, &sense_key, &asc, &ascq);
            if (sense_key == SSD_KEY_ILLEGAL_REQUEST)
                  error = cd6byteworkaround(ccb);
      }

      if (error == ERESTART)
            return (error);

      /*
       * XXX
       * Until we have a better way of doing pack validation,
       * don't treat UAs as errors.
       */
      sense_flags |= SF_RETRY_UA;
      return (cam_periph_error(ccb, cam_flags, sense_flags, 
                         &softc->saved_ccb));
}

/*
 * Read table of contents
 */
static int 
cdreadtoc(struct cam_periph *periph, u_int32_t mode, u_int32_t start, 
        u_int8_t *data, u_int32_t len, u_int32_t sense_flags)
{
      struct scsi_read_toc *scsi_cmd;
      u_int32_t ntoc;
        struct ccb_scsiio *csio;
      union ccb *ccb;
      int error;

      ntoc = len;
      error = 0;

      ccb = cdgetccb(periph, /* priority */ 1);

      csio = &ccb->csio;

      cam_fill_csio(csio, 
                  /* retries */ 1, 
                  /* cbfcnp */ cddone, 
                  /* flags */ CAM_DIR_IN,
                  /* tag_action */ MSG_SIMPLE_Q_TAG,
                  /* data_ptr */ data,
                  /* dxfer_len */ len,
                  /* sense_len */ SSD_FULL_SIZE,
                  sizeof(struct scsi_read_toc),
                  /* timeout */ 50000);

      scsi_cmd = (struct scsi_read_toc *)&csio->cdb_io.cdb_bytes;
      bzero (scsi_cmd, sizeof(*scsi_cmd));

      if (mode == CD_MSF_FORMAT)
            scsi_cmd->byte2 |= CD_MSF;
      scsi_cmd->from_track = start;
      /* scsi_ulto2b(ntoc, (u_int8_t *)scsi_cmd->data_len); */
      scsi_cmd->data_len[0] = (ntoc) >> 8;
      scsi_cmd->data_len[1] = (ntoc) & 0xff;

      scsi_cmd->op_code = READ_TOC;

      error = cdrunccb(ccb, cderror, /*cam_flags*/CAM_RETRY_SELTO,
                   /*sense_flags*/SF_RETRY_UA | sense_flags);

      xpt_release_ccb(ccb);

      return(error);
}

static int
cdreadsubchannel(struct cam_periph *periph, u_int32_t mode, 
             u_int32_t format, int track, 
             struct cd_sub_channel_info *data, u_int32_t len) 
{
      struct scsi_read_subchannel *scsi_cmd;
        struct ccb_scsiio *csio;
      union ccb *ccb;
      int error;

      error = 0;

      ccb = cdgetccb(periph, /* priority */ 1);

      csio = &ccb->csio;

      cam_fill_csio(csio, 
                  /* retries */ 1, 
                  /* cbfcnp */ cddone, 
                  /* flags */ CAM_DIR_IN,
                  /* tag_action */ MSG_SIMPLE_Q_TAG,
                  /* data_ptr */ (u_int8_t *)data,
                  /* dxfer_len */ len,
                  /* sense_len */ SSD_FULL_SIZE,
                  sizeof(struct scsi_read_subchannel),
                  /* timeout */ 50000);

      scsi_cmd = (struct scsi_read_subchannel *)&csio->cdb_io.cdb_bytes;
      bzero (scsi_cmd, sizeof(*scsi_cmd));

      scsi_cmd->op_code = READ_SUBCHANNEL;
      if (mode == CD_MSF_FORMAT)
            scsi_cmd->byte1 |= CD_MSF;
      scsi_cmd->byte2 = SRS_SUBQ;
      scsi_cmd->subchan_format = format;
      scsi_cmd->track = track;
      scsi_ulto2b(len, (u_int8_t *)scsi_cmd->data_len);
      scsi_cmd->control = 0;

      error = cdrunccb(ccb, cderror, /*cam_flags*/CAM_RETRY_SELTO,
                   /*sense_flags*/SF_RETRY_UA);

      xpt_release_ccb(ccb);

      return(error);
}


/*
 * All MODE_SENSE requests in the cd(4) driver MUST go through this
 * routine.  See comments in cd6byteworkaround() for details.
 */
static int
cdgetmode(struct cam_periph *periph, struct cd_mode_params *data,
        u_int32_t page)
{
      struct ccb_scsiio *csio;
      struct cd_softc *softc;
      union ccb *ccb;
      int param_len;
      int error;

      softc = (struct cd_softc *)periph->softc;

      ccb = cdgetccb(periph, /* priority */ 1);

      csio = &ccb->csio;

      data->cdb_size = softc->minimum_command_size;
      if (data->cdb_size < 10)
            param_len = sizeof(struct cd_mode_data);
      else
            param_len = sizeof(struct cd_mode_data_10);

      /* Don't say we've got more room than we actually allocated */
      param_len = min(param_len, data->alloc_len);

      scsi_mode_sense_len(csio,
                      /* retries */ 1,
                      /* cbfcnp */ cddone,
                      /* tag_action */ MSG_SIMPLE_Q_TAG,
                      /* dbd */ 0,
                      /* page_code */ SMS_PAGE_CTRL_CURRENT,
                      /* page */ page,
                      /* param_buf */ data->mode_buf,
                      /* param_len */ param_len,
                      /* minimum_cmd_size */ softc->minimum_command_size,
                      /* sense_len */ SSD_FULL_SIZE,
                      /* timeout */ 50000);

      /*
       * It would be nice not to have to do this, but there's no
       * available pointer in the CCB that would allow us to stuff the
       * mode params structure in there and retrieve it in
       * cd6byteworkaround(), so we can set the cdb size.  The cdb size
       * lets the caller know what CDB size we ended up using, so they
       * can find the actual mode page offset.
       */
      STAILQ_INSERT_TAIL(&softc->mode_queue, data, links);

      error = cdrunccb(ccb, cderror, /*cam_flags*/CAM_RETRY_SELTO,
                   /*sense_flags*/SF_RETRY_UA);

      xpt_release_ccb(ccb);

      STAILQ_REMOVE(&softc->mode_queue, data, cd_mode_params, links);

      /*
       * This is a bit of belt-and-suspenders checking, but if we run
       * into a situation where the target sends back multiple block
       * descriptors, we might not have enough space in the buffer to
       * see the whole mode page.  Better to return an error than
       * potentially access memory beyond our malloced region.
       */
      if (error == 0) {
            u_int32_t data_len;

            if (data->cdb_size == 10) {
                  struct scsi_mode_header_10 *hdr10;

                  hdr10 = (struct scsi_mode_header_10 *)data->mode_buf;
                  data_len = scsi_2btoul(hdr10->data_length);
                  data_len += sizeof(hdr10->data_length);
            } else {
                  struct scsi_mode_header_6 *hdr6;

                  hdr6 = (struct scsi_mode_header_6 *)data->mode_buf;
                  data_len = hdr6->data_length;
                  data_len += sizeof(hdr6->data_length);
            }

            /*
             * Complain if there is more mode data available than we
             * allocated space for.  This could potentially happen if
             * we miscalculated the page length for some reason, if the
             * drive returns multiple block descriptors, or if it sets
             * the data length incorrectly.
             */
            if (data_len > data->alloc_len) {
                  xpt_print(periph->path, "allocated modepage %d length "
                      "%d < returned length %d\n", page, data->alloc_len,
                      data_len);
                  error = ENOSPC;
            }
      }
      return (error);
}

/*
 * All MODE_SELECT requests in the cd(4) driver MUST go through this
 * routine.  See comments in cd6byteworkaround() for details.
 */
static int
cdsetmode(struct cam_periph *periph, struct cd_mode_params *data)
{
      struct ccb_scsiio *csio;
      struct cd_softc *softc;
      union ccb *ccb;
      int cdb_size, param_len;
      int error;

      softc = (struct cd_softc *)periph->softc;

      ccb = cdgetccb(periph, /* priority */ 1);

      csio = &ccb->csio;

      error = 0;

      /*
       * If the data is formatted for the 10 byte version of the mode
       * select parameter list, we need to use the 10 byte CDB.
       * Otherwise, we use whatever the stored minimum command size.
       */
      if (data->cdb_size == 10)
            cdb_size = data->cdb_size;
      else
            cdb_size = softc->minimum_command_size;

      if (cdb_size >= 10) {
            struct scsi_mode_header_10 *mode_header;
            u_int32_t data_len;

            mode_header = (struct scsi_mode_header_10 *)data->mode_buf;

            data_len = scsi_2btoul(mode_header->data_length);

            scsi_ulto2b(0, mode_header->data_length);
            /*
             * SONY drives do not allow a mode select with a medium_type
             * value that has just been returned by a mode sense; use a
             * medium_type of 0 (Default) instead.
             */
            mode_header->medium_type = 0;

            /*
             * Pass back whatever the drive passed to us, plus the size
             * of the data length field.
             */
            param_len = data_len + sizeof(mode_header->data_length);

      } else {
            struct scsi_mode_header_6 *mode_header;

            mode_header = (struct scsi_mode_header_6 *)data->mode_buf;

            param_len = mode_header->data_length + 1;

            mode_header->data_length = 0;
            /*
             * SONY drives do not allow a mode select with a medium_type
             * value that has just been returned by a mode sense; use a
             * medium_type of 0 (Default) instead.
             */
            mode_header->medium_type = 0;
      }

      /* Don't say we've got more room than we actually allocated */
      param_len = min(param_len, data->alloc_len);

      scsi_mode_select_len(csio,
                       /* retries */ 1,
                       /* cbfcnp */ cddone,
                       /* tag_action */ MSG_SIMPLE_Q_TAG,
                       /* scsi_page_fmt */ 1,
                       /* save_pages */ 0,
                       /* param_buf */ data->mode_buf,
                       /* param_len */ param_len,
                       /* minimum_cmd_size */ cdb_size,
                       /* sense_len */ SSD_FULL_SIZE,
                       /* timeout */ 50000);

      /* See comments in cdgetmode() and cd6byteworkaround(). */
      STAILQ_INSERT_TAIL(&softc->mode_queue, data, links);

      error = cdrunccb(ccb, cderror, /*cam_flags*/CAM_RETRY_SELTO,
                   /*sense_flags*/SF_RETRY_UA);

      xpt_release_ccb(ccb);

      STAILQ_REMOVE(&softc->mode_queue, data, cd_mode_params, links);

      return (error);
}


static int 
cdplay(struct cam_periph *periph, u_int32_t blk, u_int32_t len)
{
      struct ccb_scsiio *csio;
      union ccb *ccb;
      int error;
      u_int8_t cdb_len;

      error = 0;
      ccb = cdgetccb(periph, /* priority */ 1);
      csio = &ccb->csio;
      /*
       * Use the smallest possible command to perform the operation.
       */
      if ((len & 0xffff0000) == 0) {
            /*
             * We can fit in a 10 byte cdb.
             */
            struct scsi_play_10 *scsi_cmd;

            scsi_cmd = (struct scsi_play_10 *)&csio->cdb_io.cdb_bytes;
            bzero (scsi_cmd, sizeof(*scsi_cmd));
            scsi_cmd->op_code = PLAY_10;
            scsi_ulto4b(blk, (u_int8_t *)scsi_cmd->blk_addr);
            scsi_ulto2b(len, (u_int8_t *)scsi_cmd->xfer_len);
            cdb_len = sizeof(*scsi_cmd);
      } else  {
            struct scsi_play_12 *scsi_cmd;

            scsi_cmd = (struct scsi_play_12 *)&csio->cdb_io.cdb_bytes;
            bzero (scsi_cmd, sizeof(*scsi_cmd));
            scsi_cmd->op_code = PLAY_12;
            scsi_ulto4b(blk, (u_int8_t *)scsi_cmd->blk_addr);
            scsi_ulto4b(len, (u_int8_t *)scsi_cmd->xfer_len);
            cdb_len = sizeof(*scsi_cmd);
      }
      cam_fill_csio(csio,
                  /*retries*/2,
                  cddone,
                  /*flags*/CAM_DIR_NONE,
                  MSG_SIMPLE_Q_TAG,
                  /*dataptr*/NULL,
                  /*datalen*/0,
                  /*sense_len*/SSD_FULL_SIZE,
                  cdb_len,
                  /*timeout*/50 * 1000);

      error = cdrunccb(ccb, cderror, /*cam_flags*/CAM_RETRY_SELTO,
                   /*sense_flags*/SF_RETRY_UA);

      xpt_release_ccb(ccb);

      return(error);
}

static int
cdplaymsf(struct cam_periph *periph, u_int32_t startm, u_int32_t starts,
        u_int32_t startf, u_int32_t endm, u_int32_t ends, u_int32_t endf)
{
      struct scsi_play_msf *scsi_cmd;
        struct ccb_scsiio *csio;
      union ccb *ccb;
      int error;

      error = 0;

      ccb = cdgetccb(periph, /* priority */ 1);

      csio = &ccb->csio;

      cam_fill_csio(csio, 
                  /* retries */ 1, 
                  /* cbfcnp */ cddone, 
                  /* flags */ CAM_DIR_NONE,
                  /* tag_action */ MSG_SIMPLE_Q_TAG,
                  /* data_ptr */ NULL,
                  /* dxfer_len */ 0,
                  /* sense_len */ SSD_FULL_SIZE,
                  sizeof(struct scsi_play_msf),
                  /* timeout */ 50000);

      scsi_cmd = (struct scsi_play_msf *)&csio->cdb_io.cdb_bytes;
      bzero (scsi_cmd, sizeof(*scsi_cmd));

        scsi_cmd->op_code = PLAY_MSF;
        scsi_cmd->start_m = startm;
        scsi_cmd->start_s = starts;
        scsi_cmd->start_f = startf;
        scsi_cmd->end_m = endm;
        scsi_cmd->end_s = ends;
        scsi_cmd->end_f = endf; 

      error = cdrunccb(ccb, cderror, /*cam_flags*/CAM_RETRY_SELTO,
                   /*sense_flags*/SF_RETRY_UA);
      
      xpt_release_ccb(ccb);

      return(error);
}


static int
cdplaytracks(struct cam_periph *periph, u_int32_t strack, u_int32_t sindex,
           u_int32_t etrack, u_int32_t eindex)
{
      struct scsi_play_track *scsi_cmd;
        struct ccb_scsiio *csio;
      union ccb *ccb;
      int error;

      error = 0;

      ccb = cdgetccb(periph, /* priority */ 1);

      csio = &ccb->csio;

      cam_fill_csio(csio, 
                  /* retries */ 1, 
                  /* cbfcnp */ cddone, 
                  /* flags */ CAM_DIR_NONE,
                  /* tag_action */ MSG_SIMPLE_Q_TAG,
                  /* data_ptr */ NULL,
                  /* dxfer_len */ 0,
                  /* sense_len */ SSD_FULL_SIZE,
                  sizeof(struct scsi_play_track),
                  /* timeout */ 50000);

      scsi_cmd = (struct scsi_play_track *)&csio->cdb_io.cdb_bytes;
      bzero (scsi_cmd, sizeof(*scsi_cmd));

        scsi_cmd->op_code = PLAY_TRACK;
        scsi_cmd->start_track = strack;
        scsi_cmd->start_index = sindex;
        scsi_cmd->end_track = etrack;
        scsi_cmd->end_index = eindex;

      error = cdrunccb(ccb, cderror, /*cam_flags*/CAM_RETRY_SELTO,
                   /*sense_flags*/SF_RETRY_UA);

      xpt_release_ccb(ccb);

      return(error);
}

static int
cdpause(struct cam_periph *periph, u_int32_t go)
{
      struct scsi_pause *scsi_cmd;
        struct ccb_scsiio *csio;
      union ccb *ccb;
      int error;

      error = 0;

      ccb = cdgetccb(periph, /* priority */ 1);

      csio = &ccb->csio;

      cam_fill_csio(csio, 
                  /* retries */ 1, 
                  /* cbfcnp */ cddone, 
                  /* flags */ CAM_DIR_NONE,
                  /* tag_action */ MSG_SIMPLE_Q_TAG,
                  /* data_ptr */ NULL,
                  /* dxfer_len */ 0,
                  /* sense_len */ SSD_FULL_SIZE,
                  sizeof(struct scsi_pause),
                  /* timeout */ 50000);

      scsi_cmd = (struct scsi_pause *)&csio->cdb_io.cdb_bytes;
      bzero (scsi_cmd, sizeof(*scsi_cmd));

        scsi_cmd->op_code = PAUSE;
      scsi_cmd->resume = go;

      error = cdrunccb(ccb, cderror, /*cam_flags*/CAM_RETRY_SELTO,
                   /*sense_flags*/SF_RETRY_UA);

      xpt_release_ccb(ccb);

      return(error);
}

static int
cdstartunit(struct cam_periph *periph, int load)
{
      union ccb *ccb;
      int error;

      error = 0;

      ccb = cdgetccb(periph, /* priority */ 1);

      scsi_start_stop(&ccb->csio,
                  /* retries */ 1,
                  /* cbfcnp */ cddone,
                  /* tag_action */ MSG_SIMPLE_Q_TAG,
                  /* start */ TRUE,
                  /* load_eject */ load,
                  /* immediate */ FALSE,
                  /* sense_len */ SSD_FULL_SIZE,
                  /* timeout */ 50000);

      error = cdrunccb(ccb, cderror, /*cam_flags*/CAM_RETRY_SELTO,
                   /*sense_flags*/SF_RETRY_UA);

      xpt_release_ccb(ccb);

      return(error);
}

static int
cdstopunit(struct cam_periph *periph, u_int32_t eject)
{
      union ccb *ccb;
      int error;

      error = 0;

      ccb = cdgetccb(periph, /* priority */ 1);

      scsi_start_stop(&ccb->csio,
                  /* retries */ 1,
                  /* cbfcnp */ cddone,
                  /* tag_action */ MSG_SIMPLE_Q_TAG,
                  /* start */ FALSE,
                  /* load_eject */ eject,
                  /* immediate */ FALSE,
                  /* sense_len */ SSD_FULL_SIZE,
                  /* timeout */ 50000);

      error = cdrunccb(ccb, cderror, /*cam_flags*/CAM_RETRY_SELTO,
                   /*sense_flags*/SF_RETRY_UA);

      xpt_release_ccb(ccb);

      return(error);
}

static int
cdsetspeed(struct cam_periph *periph, u_int32_t rdspeed, u_int32_t wrspeed)
{
      struct scsi_set_speed *scsi_cmd;
      struct ccb_scsiio *csio;
      union ccb *ccb;
      int error;

      error = 0;
      ccb = cdgetccb(periph, /* priority */ 1);
      csio = &ccb->csio;

      /* Preserve old behavior: units in multiples of CDROM speed */
      if (rdspeed < 177)
            rdspeed *= 177;
      if (wrspeed < 177)
            wrspeed *= 177;

      cam_fill_csio(csio,
                  /* retries */ 1,
                  /* cbfcnp */ cddone,
                  /* flags */ CAM_DIR_NONE,
                  /* tag_action */ MSG_SIMPLE_Q_TAG,
                  /* data_ptr */ NULL,
                  /* dxfer_len */ 0,
                  /* sense_len */ SSD_FULL_SIZE,
                  sizeof(struct scsi_set_speed),
                  /* timeout */ 50000);

      scsi_cmd = (struct scsi_set_speed *)&csio->cdb_io.cdb_bytes;
      bzero(scsi_cmd, sizeof(*scsi_cmd));

      scsi_cmd->opcode = SET_CD_SPEED;
      scsi_ulto2b(rdspeed, scsi_cmd->readspeed);
      scsi_ulto2b(wrspeed, scsi_cmd->writespeed);

      error = cdrunccb(ccb, cderror, /*cam_flags*/CAM_RETRY_SELTO,
                   /*sense_flags*/SF_RETRY_UA);

      xpt_release_ccb(ccb);

      return(error);
}

static int
cdreportkey(struct cam_periph *periph, struct dvd_authinfo *authinfo)
{
      union ccb *ccb;
      u_int8_t *databuf;
      u_int32_t lba;
      int error;
      int length;

      error = 0;
      databuf = NULL;
      lba = 0;

      ccb = cdgetccb(periph, /* priority */ 1);

      switch (authinfo->format) {
      case DVD_REPORT_AGID:
            length = sizeof(struct scsi_report_key_data_agid);
            break;
      case DVD_REPORT_CHALLENGE:
            length = sizeof(struct scsi_report_key_data_challenge);
            break;
      case DVD_REPORT_KEY1:
            length = sizeof(struct scsi_report_key_data_key1_key2);
            break;
      case DVD_REPORT_TITLE_KEY:
            length = sizeof(struct scsi_report_key_data_title);
            /* The lba field is only set for the title key */
            lba = authinfo->lba;
            break;
      case DVD_REPORT_ASF:
            length = sizeof(struct scsi_report_key_data_asf);
            break;
      case DVD_REPORT_RPC:
            length = sizeof(struct scsi_report_key_data_rpc);
            break;
      case DVD_INVALIDATE_AGID:
            length = 0;
            break;
      default:
            error = EINVAL;
            goto bailout;
            break; /* NOTREACHED */
      }

      if (length != 0) {
            databuf = malloc(length, M_DEVBUF, M_WAITOK | M_ZERO);
      } else
            databuf = NULL;


      scsi_report_key(&ccb->csio,
                  /* retries */ 1,
                  /* cbfcnp */ cddone,
                  /* tag_action */ MSG_SIMPLE_Q_TAG,
                  /* lba */ lba,
                  /* agid */ authinfo->agid,
                  /* key_format */ authinfo->format,
                  /* data_ptr */ databuf,
                  /* dxfer_len */ length,
                  /* sense_len */ SSD_FULL_SIZE,
                  /* timeout */ 50000);

      error = cdrunccb(ccb, cderror, /*cam_flags*/CAM_RETRY_SELTO,
                   /*sense_flags*/SF_RETRY_UA);

      if (error != 0)
            goto bailout;

      if (ccb->csio.resid != 0) {
            xpt_print(periph->path, "warning, residual for report key "
                "command is %d\n", ccb->csio.resid);
      }

      switch(authinfo->format) {
      case DVD_REPORT_AGID: {
            struct scsi_report_key_data_agid *agid_data;

            agid_data = (struct scsi_report_key_data_agid *)databuf;

            authinfo->agid = (agid_data->agid & RKD_AGID_MASK) >>
                  RKD_AGID_SHIFT;
            break;
      }
      case DVD_REPORT_CHALLENGE: {
            struct scsi_report_key_data_challenge *chal_data;

            chal_data = (struct scsi_report_key_data_challenge *)databuf;

            bcopy(chal_data->challenge_key, authinfo->keychal,
                  min(sizeof(chal_data->challenge_key),
                      sizeof(authinfo->keychal)));
            break;
      }
      case DVD_REPORT_KEY1: {
            struct scsi_report_key_data_key1_key2 *key1_data;

            key1_data = (struct scsi_report_key_data_key1_key2 *)databuf;

            bcopy(key1_data->key1, authinfo->keychal,
                  min(sizeof(key1_data->key1), sizeof(authinfo->keychal)));
            break;
      }
      case DVD_REPORT_TITLE_KEY: {
            struct scsi_report_key_data_title *title_data;

            title_data = (struct scsi_report_key_data_title *)databuf;

            authinfo->cpm = (title_data->byte0 & RKD_TITLE_CPM) >>
                  RKD_TITLE_CPM_SHIFT;
            authinfo->cp_sec = (title_data->byte0 & RKD_TITLE_CP_SEC) >>
                  RKD_TITLE_CP_SEC_SHIFT;
            authinfo->cgms = (title_data->byte0 & RKD_TITLE_CMGS_MASK) >>
                  RKD_TITLE_CMGS_SHIFT;
            bcopy(title_data->title_key, authinfo->keychal,
                  min(sizeof(title_data->title_key),
                    sizeof(authinfo->keychal)));
            break;
      }
      case DVD_REPORT_ASF: {
            struct scsi_report_key_data_asf *asf_data;

            asf_data = (struct scsi_report_key_data_asf *)databuf;

            authinfo->asf = asf_data->success & RKD_ASF_SUCCESS;
            break;
      }
      case DVD_REPORT_RPC: {
            struct scsi_report_key_data_rpc *rpc_data;

            rpc_data = (struct scsi_report_key_data_rpc *)databuf;

            authinfo->reg_type = (rpc_data->byte4 & RKD_RPC_TYPE_MASK) >>
                  RKD_RPC_TYPE_SHIFT;
            authinfo->vend_rsts =
                  (rpc_data->byte4 & RKD_RPC_VENDOR_RESET_MASK) >>
                  RKD_RPC_VENDOR_RESET_SHIFT;
            authinfo->user_rsts = rpc_data->byte4 & RKD_RPC_USER_RESET_MASK;
            authinfo->region = rpc_data->region_mask;
            authinfo->rpc_scheme = rpc_data->rpc_scheme1;
            break;
      }
      case DVD_INVALIDATE_AGID:
            break;
      default:
            /* This should be impossible, since we checked above */
            error = EINVAL;
            goto bailout;
            break; /* NOTREACHED */
      }
bailout:
      if (databuf != NULL)
            free(databuf, M_DEVBUF);

      xpt_release_ccb(ccb);

      return(error);
}

static int
cdsendkey(struct cam_periph *periph, struct dvd_authinfo *authinfo)
{
      union ccb *ccb;
      u_int8_t *databuf;
      int length;
      int error;

      error = 0;
      databuf = NULL;

      ccb = cdgetccb(periph, /* priority */ 1);

      switch(authinfo->format) {
      case DVD_SEND_CHALLENGE: {
            struct scsi_report_key_data_challenge *challenge_data;

            length = sizeof(*challenge_data);

            challenge_data = malloc(length, M_DEVBUF, M_WAITOK | M_ZERO);

            databuf = (u_int8_t *)challenge_data;

            scsi_ulto2b(length - sizeof(challenge_data->data_len),
                      challenge_data->data_len);

            bcopy(authinfo->keychal, challenge_data->challenge_key,
                  min(sizeof(authinfo->keychal),
                    sizeof(challenge_data->challenge_key)));
            break;
      }
      case DVD_SEND_KEY2: {
            struct scsi_report_key_data_key1_key2 *key2_data;

            length = sizeof(*key2_data);

            key2_data = malloc(length, M_DEVBUF, M_WAITOK | M_ZERO);

            databuf = (u_int8_t *)key2_data;

            scsi_ulto2b(length - sizeof(key2_data->data_len),
                      key2_data->data_len);

            bcopy(authinfo->keychal, key2_data->key1,
                  min(sizeof(authinfo->keychal), sizeof(key2_data->key1)));

            break;
      }
      case DVD_SEND_RPC: {
            struct scsi_send_key_data_rpc *rpc_data;

            length = sizeof(*rpc_data);

            rpc_data = malloc(length, M_DEVBUF, M_WAITOK | M_ZERO);

            databuf = (u_int8_t *)rpc_data;

            scsi_ulto2b(length - sizeof(rpc_data->data_len),
                      rpc_data->data_len);

            rpc_data->region_code = authinfo->region;
            break;
      }
      default:
            error = EINVAL;
            goto bailout;
            break; /* NOTREACHED */
      }

      scsi_send_key(&ccb->csio,
                  /* retries */ 1,
                  /* cbfcnp */ cddone,
                  /* tag_action */ MSG_SIMPLE_Q_TAG,
                  /* agid */ authinfo->agid,
                  /* key_format */ authinfo->format,
                  /* data_ptr */ databuf,
                  /* dxfer_len */ length,
                  /* sense_len */ SSD_FULL_SIZE,
                  /* timeout */ 50000);

      error = cdrunccb(ccb, cderror, /*cam_flags*/CAM_RETRY_SELTO,
                   /*sense_flags*/SF_RETRY_UA);

bailout:

      if (databuf != NULL)
            free(databuf, M_DEVBUF);

      xpt_release_ccb(ccb);

      return(error);
}

static int
cdreaddvdstructure(struct cam_periph *periph, struct dvd_struct *dvdstruct)
{
      union ccb *ccb;
      u_int8_t *databuf;
      u_int32_t address;
      int error;
      int length;

      error = 0;
      databuf = NULL;
      /* The address is reserved for many of the formats */
      address = 0;

      ccb = cdgetccb(periph, /* priority */ 1);

      switch(dvdstruct->format) {
      case DVD_STRUCT_PHYSICAL:
            length = sizeof(struct scsi_read_dvd_struct_data_physical);
            break;
      case DVD_STRUCT_COPYRIGHT:
            length = sizeof(struct scsi_read_dvd_struct_data_copyright);
            break;
      case DVD_STRUCT_DISCKEY:
            length = sizeof(struct scsi_read_dvd_struct_data_disc_key);
            break;
      case DVD_STRUCT_BCA:
            length = sizeof(struct scsi_read_dvd_struct_data_bca);
            break;
      case DVD_STRUCT_MANUFACT:
            length = sizeof(struct scsi_read_dvd_struct_data_manufacturer);
            break;
      case DVD_STRUCT_CMI:
            error = ENODEV;
            goto bailout;
#ifdef notyet
            length = sizeof(struct scsi_read_dvd_struct_data_copy_manage);
            address = dvdstruct->address;
#endif
            break; /* NOTREACHED */
      case DVD_STRUCT_PROTDISCID:
            length = sizeof(struct scsi_read_dvd_struct_data_prot_discid);
            break;
      case DVD_STRUCT_DISCKEYBLOCK:
            length = sizeof(struct scsi_read_dvd_struct_data_disc_key_blk);
            break;
      case DVD_STRUCT_DDS:
            length = sizeof(struct scsi_read_dvd_struct_data_dds);
            break;
      case DVD_STRUCT_MEDIUM_STAT:
            length = sizeof(struct scsi_read_dvd_struct_data_medium_status);
            break;
      case DVD_STRUCT_SPARE_AREA:
            length = sizeof(struct scsi_read_dvd_struct_data_spare_area);
            break;
      case DVD_STRUCT_RMD_LAST:
            error = ENODEV;
            goto bailout;
#ifdef notyet
            length = sizeof(struct scsi_read_dvd_struct_data_rmd_borderout);
            address = dvdstruct->address;
#endif
            break; /* NOTREACHED */
      case DVD_STRUCT_RMD_RMA:
            error = ENODEV;
            goto bailout;
#ifdef notyet
            length = sizeof(struct scsi_read_dvd_struct_data_rmd);
            address = dvdstruct->address;
#endif
            break; /* NOTREACHED */
      case DVD_STRUCT_PRERECORDED:
            length = sizeof(struct scsi_read_dvd_struct_data_leadin);
            break;
      case DVD_STRUCT_UNIQUEID:
            length = sizeof(struct scsi_read_dvd_struct_data_disc_id);
            break;
      case DVD_STRUCT_DCB:
            error = ENODEV;
            goto bailout;
#ifdef notyet
            length = sizeof(struct scsi_read_dvd_struct_data_dcb);
            address = dvdstruct->address;
#endif
            break; /* NOTREACHED */
      case DVD_STRUCT_LIST:
            /*
             * This is the maximum allocation length for the READ DVD
             * STRUCTURE command.  There's nothing in the MMC3 spec
             * that indicates a limit in the amount of data that can
             * be returned from this call, other than the limits
             * imposed by the 2-byte length variables.
             */
            length = 65535;
            break;
      default:
            error = EINVAL;
            goto bailout;
            break; /* NOTREACHED */
      }

      if (length != 0) {
            databuf = malloc(length, M_DEVBUF, M_WAITOK | M_ZERO);
      } else
            databuf = NULL;

      scsi_read_dvd_structure(&ccb->csio,
                        /* retries */ 1,
                        /* cbfcnp */ cddone,
                        /* tag_action */ MSG_SIMPLE_Q_TAG,
                        /* lba */ address,
                        /* layer_number */ dvdstruct->layer_num,
                        /* key_format */ dvdstruct->format,
                        /* agid */ dvdstruct->agid,
                        /* data_ptr */ databuf,
                        /* dxfer_len */ length,
                        /* sense_len */ SSD_FULL_SIZE,
                        /* timeout */ 50000);

      error = cdrunccb(ccb, cderror, /*cam_flags*/CAM_RETRY_SELTO,
                   /*sense_flags*/SF_RETRY_UA);

      if (error != 0)
            goto bailout;

      switch(dvdstruct->format) {
      case DVD_STRUCT_PHYSICAL: {
            struct scsi_read_dvd_struct_data_layer_desc *inlayer;
            struct dvd_layer *outlayer;
            struct scsi_read_dvd_struct_data_physical *phys_data;

            phys_data =
                  (struct scsi_read_dvd_struct_data_physical *)databuf;
            inlayer = &phys_data->layer_desc;
            outlayer = (struct dvd_layer *)&dvdstruct->data;

            dvdstruct->length = sizeof(*inlayer);

            outlayer->book_type = (inlayer->book_type_version &
                  RDSD_BOOK_TYPE_MASK) >> RDSD_BOOK_TYPE_SHIFT;
            outlayer->book_version = (inlayer->book_type_version &
                  RDSD_BOOK_VERSION_MASK);
            outlayer->disc_size = (inlayer->disc_size_max_rate &
                  RDSD_DISC_SIZE_MASK) >> RDSD_DISC_SIZE_SHIFT;
            outlayer->max_rate = (inlayer->disc_size_max_rate &
                  RDSD_MAX_RATE_MASK);
            outlayer->nlayers = (inlayer->layer_info &
                  RDSD_NUM_LAYERS_MASK) >> RDSD_NUM_LAYERS_SHIFT;
            outlayer->track_path = (inlayer->layer_info &
                  RDSD_TRACK_PATH_MASK) >> RDSD_TRACK_PATH_SHIFT;
            outlayer->layer_type = (inlayer->layer_info &
                  RDSD_LAYER_TYPE_MASK);
            outlayer->linear_density = (inlayer->density &
                  RDSD_LIN_DENSITY_MASK) >> RDSD_LIN_DENSITY_SHIFT;
            outlayer->track_density = (inlayer->density &
                  RDSD_TRACK_DENSITY_MASK);
            outlayer->bca = (inlayer->bca & RDSD_BCA_MASK) >>
                  RDSD_BCA_SHIFT;
            outlayer->start_sector = scsi_3btoul(inlayer->main_data_start);
            outlayer->end_sector = scsi_3btoul(inlayer->main_data_end);
            outlayer->end_sector_l0 =
                  scsi_3btoul(inlayer->end_sector_layer0);
            break;
      }
      case DVD_STRUCT_COPYRIGHT: {
            struct scsi_read_dvd_struct_data_copyright *copy_data;

            copy_data = (struct scsi_read_dvd_struct_data_copyright *)
                  databuf;

            dvdstruct->cpst = copy_data->cps_type;
            dvdstruct->rmi = copy_data->region_info;
            dvdstruct->length = 0;

            break;
      }
      default:
            /*
             * Tell the user what the overall length is, no matter
             * what we can actually fit in the data buffer.
             */
            dvdstruct->length = length - ccb->csio.resid - 
                  sizeof(struct scsi_read_dvd_struct_data_header);

            /*
             * But only actually copy out the smaller of what we read
             * in or what the structure can take.
             */
            bcopy(databuf + sizeof(struct scsi_read_dvd_struct_data_header),
                  dvdstruct->data,
                  min(sizeof(dvdstruct->data), dvdstruct->length));
            break;
      }
bailout:

      if (databuf != NULL)
            free(databuf, M_DEVBUF);

      xpt_release_ccb(ccb);

      return(error);
}

void
scsi_report_key(struct ccb_scsiio *csio, u_int32_t retries,
            void (*cbfcnp)(struct cam_periph *, union ccb *),
            u_int8_t tag_action, u_int32_t lba, u_int8_t agid,
            u_int8_t key_format, u_int8_t *data_ptr, u_int32_t dxfer_len,
            u_int8_t sense_len, u_int32_t timeout)
{
      struct scsi_report_key *scsi_cmd;

      scsi_cmd = (struct scsi_report_key *)&csio->cdb_io.cdb_bytes;
      bzero(scsi_cmd, sizeof(*scsi_cmd));
      scsi_cmd->opcode = REPORT_KEY;
      scsi_ulto4b(lba, scsi_cmd->lba);
      scsi_ulto2b(dxfer_len, scsi_cmd->alloc_len);
      scsi_cmd->agid_keyformat = (agid << RK_KF_AGID_SHIFT) |
            (key_format & RK_KF_KEYFORMAT_MASK);

      cam_fill_csio(csio,
                  retries,
                  cbfcnp,
                  /*flags*/ (dxfer_len == 0) ? CAM_DIR_NONE : CAM_DIR_IN,
                  tag_action,
                  /*data_ptr*/ data_ptr,
                  /*dxfer_len*/ dxfer_len,
                  sense_len,
                  sizeof(*scsi_cmd),
                  timeout);
}

void
scsi_send_key(struct ccb_scsiio *csio, u_int32_t retries,
            void (*cbfcnp)(struct cam_periph *, union ccb *),
            u_int8_t tag_action, u_int8_t agid, u_int8_t key_format,
            u_int8_t *data_ptr, u_int32_t dxfer_len, u_int8_t sense_len,
            u_int32_t timeout)
{
      struct scsi_send_key *scsi_cmd;

      scsi_cmd = (struct scsi_send_key *)&csio->cdb_io.cdb_bytes;
      bzero(scsi_cmd, sizeof(*scsi_cmd));
      scsi_cmd->opcode = SEND_KEY;

      scsi_ulto2b(dxfer_len, scsi_cmd->param_len);
      scsi_cmd->agid_keyformat = (agid << RK_KF_AGID_SHIFT) |
            (key_format & RK_KF_KEYFORMAT_MASK);

      cam_fill_csio(csio,
                  retries,
                  cbfcnp,
                  /*flags*/ CAM_DIR_OUT,
                  tag_action,
                  /*data_ptr*/ data_ptr,
                  /*dxfer_len*/ dxfer_len,
                  sense_len,
                  sizeof(*scsi_cmd),
                  timeout);
}


void
scsi_read_dvd_structure(struct ccb_scsiio *csio, u_int32_t retries,
                  void (*cbfcnp)(struct cam_periph *, union ccb *),
                  u_int8_t tag_action, u_int32_t address,
                  u_int8_t layer_number, u_int8_t format, u_int8_t agid,
                  u_int8_t *data_ptr, u_int32_t dxfer_len,
                  u_int8_t sense_len, u_int32_t timeout)
{
      struct scsi_read_dvd_structure *scsi_cmd;

      scsi_cmd = (struct scsi_read_dvd_structure *)&csio->cdb_io.cdb_bytes;
      bzero(scsi_cmd, sizeof(*scsi_cmd));
      scsi_cmd->opcode = READ_DVD_STRUCTURE;

      scsi_ulto4b(address, scsi_cmd->address);
      scsi_cmd->layer_number = layer_number;
      scsi_cmd->format = format;
      scsi_ulto2b(dxfer_len, scsi_cmd->alloc_len);
      /* The AGID is the top two bits of this byte */
      scsi_cmd->agid = agid << 6;

      cam_fill_csio(csio,
                  retries,
                  cbfcnp,
                  /*flags*/ CAM_DIR_IN,
                  tag_action,
                  /*data_ptr*/ data_ptr,
                  /*dxfer_len*/ dxfer_len,
                  sense_len,
                  sizeof(*scsi_cmd),
                  timeout);
}

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