xref: /freebsd-11-stable/sys/cam/ata/ata_da.c

/*-
 * Copyright (c) 2009 Alexander Motin <mav@FreeBSD.org>
 * 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. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: head/sys/cam/ata/ata_da.c 220650 2011-04-15 07:07:29Z mav $");

#include "opt_ada.h"

#include <sys/param.h>

#ifdef _KERNEL
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/bio.h>
#include <sys/sysctl.h>
#include <sys/taskqueue.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/conf.h>
#include <sys/devicestat.h>
#include <sys/eventhandler.h>
#include <sys/malloc.h>
#include <sys/cons.h>
#include <sys/reboot.h>
#include <geom/geom_disk.h>
#endif /* _KERNEL */

#ifndef _KERNEL
#include <stdio.h>
#include <string.h>
#endif /* _KERNEL */

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

#include <cam/ata/ata_all.h>

#include <machine/md_var.h>	/* geometry translation */

#ifdef _KERNEL

#define ATA_MAX_28BIT_LBA               268435455UL

typedef enum {
	ADA_STATE_WCACHE,
	ADA_STATE_NORMAL
} ada_state;

typedef enum {
	ADA_FLAG_PACK_INVALID	= 0x001,
	ADA_FLAG_CAN_48BIT	= 0x002,
	ADA_FLAG_CAN_FLUSHCACHE	= 0x004,
	ADA_FLAG_CAN_NCQ	= 0x008,
	ADA_FLAG_CAN_DMA	= 0x010,
	ADA_FLAG_NEED_OTAG	= 0x020,
	ADA_FLAG_WENT_IDLE	= 0x040,
	ADA_FLAG_CAN_TRIM	= 0x080,
	ADA_FLAG_OPEN		= 0x100,
	ADA_FLAG_SCTX_INIT	= 0x200,
	ADA_FLAG_CAN_CFA        = 0x400,
	ADA_FLAG_CAN_POWERMGT   = 0x800
} ada_flags;

typedef enum {
	ADA_Q_NONE		= 0x00
} ada_quirks;

typedef enum {
	ADA_CCB_WCACHE		= 0x01,
	ADA_CCB_BUFFER_IO	= 0x03,
	ADA_CCB_WAITING		= 0x04,
	ADA_CCB_DUMP		= 0x05,
	ADA_CCB_TRIM		= 0x06,
	ADA_CCB_TYPE_MASK	= 0x0F,
} ada_ccb_state;

/* Offsets into our private area for storing information */
#define ccb_state	ppriv_field0
#define ccb_bp		ppriv_ptr1

struct disk_params {
	u_int8_t  heads;
	u_int8_t  secs_per_track;
	u_int32_t cylinders;
	u_int32_t secsize;	/* Number of bytes/logical sector */
	u_int64_t sectors;	/* Total number sectors */
};

#define TRIM_MAX_BLOCKS	4
#define TRIM_MAX_RANGES	TRIM_MAX_BLOCKS * 64
struct trim_request {
	uint8_t		data[TRIM_MAX_RANGES * 8];
	struct bio	*bps[TRIM_MAX_RANGES];
};

struct ada_softc {
	struct	 bio_queue_head bio_queue;
	struct	 bio_queue_head trim_queue;
	ada_state state;
	ada_flags flags;
	ada_quirks quirks;
	int	 ordered_tag_count;
	int	 outstanding_cmds;
	int	 trim_max_ranges;
	int	 trim_running;
	int	 write_cache;
#ifdef ADA_TEST_FAILURE
	int      force_read_error;
	int      force_write_error;
	int      periodic_read_error;
	int      periodic_read_count;
#endif
	struct	 disk_params params;
	struct	 disk *disk;
	struct task		sysctl_task;
	struct sysctl_ctx_list	sysctl_ctx;
	struct sysctl_oid	*sysctl_tree;
	struct callout		sendordered_c;
	struct trim_request	trim_req;
};

struct ada_quirk_entry {
	struct scsi_inquiry_pattern inq_pat;
	ada_quirks quirks;
};

static struct ada_quirk_entry ada_quirk_table[] =
{
	{
		/* Default */
		{
		  T_ANY, SIP_MEDIA_REMOVABLE|SIP_MEDIA_FIXED,
		  /*vendor*/"*", /*product*/"*", /*revision*/"*"
		},
		/*quirks*/0
	},
};

static	disk_strategy_t	adastrategy;
static	dumper_t	adadump;
static	periph_init_t	adainit;
static	void		adaasync(void *callback_arg, u_int32_t code,
				struct cam_path *path, void *arg);
static	void		adasysctlinit(void *context, int pending);
static	periph_ctor_t	adaregister;
static	periph_dtor_t	adacleanup;
static	periph_start_t	adastart;
static	periph_oninv_t	adaoninvalidate;
static	void		adadone(struct cam_periph *periph,
			       union ccb *done_ccb);
static  int		adaerror(union ccb *ccb, u_int32_t cam_flags,
				u_int32_t sense_flags);
static void		adagetparams(struct cam_periph *periph,
				struct ccb_getdev *cgd);
static timeout_t	adasendorderedtag;
static void		adashutdown(void *arg, int howto);
static void		adasuspend(void *arg);
static void		adaresume(void *arg);

#ifndef ADA_DEFAULT_TIMEOUT
#define ADA_DEFAULT_TIMEOUT 30	/* Timeout in seconds */
#endif

#ifndef	ADA_DEFAULT_RETRY
#define	ADA_DEFAULT_RETRY	4
#endif

#ifndef	ADA_DEFAULT_SEND_ORDERED
#define	ADA_DEFAULT_SEND_ORDERED	1
#endif

#ifndef	ADA_DEFAULT_SPINDOWN_SHUTDOWN
#define	ADA_DEFAULT_SPINDOWN_SHUTDOWN	1
#endif

#ifndef	ADA_DEFAULT_SPINDOWN_SUSPEND
#define	ADA_DEFAULT_SPINDOWN_SUSPEND	1
#endif

#ifndef	ADA_DEFAULT_WRITE_CACHE
#define	ADA_DEFAULT_WRITE_CACHE	1
#endif

/*
 * Most platforms map firmware geometry to actual, but some don't.  If
 * not overridden, default to nothing.
 */
#ifndef ata_disk_firmware_geom_adjust
#define	ata_disk_firmware_geom_adjust(disk)
#endif

static int ada_retry_count = ADA_DEFAULT_RETRY;
static int ada_default_timeout = ADA_DEFAULT_TIMEOUT;
static int ada_send_ordered = ADA_DEFAULT_SEND_ORDERED;
static int ada_spindown_shutdown = ADA_DEFAULT_SPINDOWN_SHUTDOWN;
static int ada_spindown_suspend = ADA_DEFAULT_SPINDOWN_SUSPEND;
static int ada_write_cache = ADA_DEFAULT_WRITE_CACHE;

SYSCTL_NODE(_kern_cam, OID_AUTO, ada, CTLFLAG_RD, 0,
            "CAM Direct Access Disk driver");
SYSCTL_INT(_kern_cam_ada, OID_AUTO, retry_count, CTLFLAG_RW,
           &ada_retry_count, 0, "Normal I/O retry count");
TUNABLE_INT("kern.cam.ada.retry_count", &ada_retry_count);
SYSCTL_INT(_kern_cam_ada, OID_AUTO, default_timeout, CTLFLAG_RW,
           &ada_default_timeout, 0, "Normal I/O timeout (in seconds)");
TUNABLE_INT("kern.cam.ada.default_timeout", &ada_default_timeout);
SYSCTL_INT(_kern_cam_ada, OID_AUTO, ada_send_ordered, CTLFLAG_RW,
           &ada_send_ordered, 0, "Send Ordered Tags");
TUNABLE_INT("kern.cam.ada.ada_send_ordered", &ada_send_ordered);
SYSCTL_INT(_kern_cam_ada, OID_AUTO, spindown_shutdown, CTLFLAG_RW,
           &ada_spindown_shutdown, 0, "Spin down upon shutdown");
TUNABLE_INT("kern.cam.ada.spindown_shutdown", &ada_spindown_shutdown);
SYSCTL_INT(_kern_cam_ada, OID_AUTO, spindown_suspend, CTLFLAG_RW,
           &ada_spindown_suspend, 0, "Spin down upon suspend");
TUNABLE_INT("kern.cam.ada.spindown_suspend", &ada_spindown_suspend);
SYSCTL_INT(_kern_cam_ada, OID_AUTO, write_cache, CTLFLAG_RW,
           &ada_write_cache, 0, "Enable disk write cache");
TUNABLE_INT("kern.cam.ada.write_cache", &ada_write_cache);

/*
 * ADA_ORDEREDTAG_INTERVAL determines how often, relative
 * to the default timeout, we check to see whether an ordered
 * tagged transaction is appropriate to prevent simple tag
 * starvation.  Since we'd like to ensure that there is at least
 * 1/2 of the timeout length left for a starved transaction to
 * complete after we've sent an ordered tag, we must poll at least
 * four times in every timeout period.  This takes care of the worst
 * case where a starved transaction starts during an interval that
 * meets the requirement "don't send an ordered tag" test so it takes
 * us two intervals to determine that a tag must be sent.
 */
#ifndef ADA_ORDEREDTAG_INTERVAL
#define ADA_ORDEREDTAG_INTERVAL 4
#endif

static struct periph_driver adadriver =
{
	adainit, "ada",
	TAILQ_HEAD_INITIALIZER(adadriver.units), /* generation */ 0
};

PERIPHDRIVER_DECLARE(ada, adadriver);

MALLOC_DEFINE(M_ATADA, "ata_da", "ata_da buffers");

static int
adaopen(struct disk *dp)
{
	struct cam_periph *periph;
	struct ada_softc *softc;
	int unit;
	int error;

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

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

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

	unit = periph->unit_number;
	softc = (struct ada_softc *)periph->softc;
	softc->flags |= ADA_FLAG_OPEN;

	CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
	    ("adaopen: disk=%s%d (unit %d)\n", dp->d_name, dp->d_unit,
	     unit));

	if ((softc->flags & ADA_FLAG_PACK_INVALID) != 0) {
		/* Invalidate our pack information. */
		softc->flags &= ~ADA_FLAG_PACK_INVALID;
	}

	cam_periph_unhold(periph);
	cam_periph_unlock(periph);
	return (0);
}

static int
adaclose(struct disk *dp)
{
	struct	cam_periph *periph;
	struct	ada_softc *softc;
	union ccb *ccb;
	int error;

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

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

	softc = (struct ada_softc *)periph->softc;
	/* We only sync the cache if the drive is capable of it. */
	if (softc->flags & ADA_FLAG_CAN_FLUSHCACHE) {

		ccb = cam_periph_getccb(periph, CAM_PRIORITY_NORMAL);
		cam_fill_ataio(&ccb->ataio,
				    1,
				    adadone,
				    CAM_DIR_NONE,
				    0,
				    NULL,
				    0,
				    ada_default_timeout*1000);

		if (softc->flags & ADA_FLAG_CAN_48BIT)
			ata_48bit_cmd(&ccb->ataio, ATA_FLUSHCACHE48, 0, 0, 0);
		else
			ata_28bit_cmd(&ccb->ataio, ATA_FLUSHCACHE, 0, 0, 0);
		cam_periph_runccb(ccb, /*error_routine*/NULL, /*cam_flags*/0,
		    /*sense_flags*/0, softc->disk->d_devstat);

		if ((ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP)
			xpt_print(periph->path, "Synchronize cache failed\n");

		if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
			cam_release_devq(ccb->ccb_h.path,
					 /*relsim_flags*/0,
					 /*reduction*/0,
					 /*timeout*/0,
					 /*getcount_only*/0);
		xpt_release_ccb(ccb);
	}

	softc->flags &= ~ADA_FLAG_OPEN;
	cam_periph_unhold(periph);
	cam_periph_unlock(periph);
	cam_periph_release(periph);
	return (0);
}

static void
adaschedule(struct cam_periph *periph)
{
	struct ada_softc *softc = (struct ada_softc *)periph->softc;

	if (bioq_first(&softc->bio_queue) ||
	    (!softc->trim_running && bioq_first(&softc->trim_queue))) {
		/* Have more work to do, so ensure we stay scheduled */
		xpt_schedule(periph, CAM_PRIORITY_NORMAL);
	}
}

/*
 * 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
adastrategy(struct bio *bp)
{
	struct cam_periph *periph;
	struct ada_softc *softc;

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

	cam_periph_lock(periph);

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

	/*
	 * Place it in the queue of disk activities for this disk
	 */
	if (bp->bio_cmd == BIO_DELETE &&
	    (softc->flags & ADA_FLAG_CAN_TRIM))
		bioq_disksort(&softc->trim_queue, bp);
	else
		bioq_disksort(&softc->bio_queue, bp);

	/*
	 * Schedule ourselves for performing the work.
	 */
	adaschedule(periph);
	cam_periph_unlock(periph);

	return;
}

static int
adadump(void *arg, void *virtual, vm_offset_t physical, off_t offset, size_t length)
{
	struct	    cam_periph *periph;
	struct	    ada_softc *softc;
	u_int	    secsize;
	union	    ccb ccb;
	struct	    disk *dp;
	uint64_t    lba;
	uint16_t    count;

	dp = arg;
	periph = dp->d_drv1;
	if (periph == NULL)
		return (ENXIO);
	softc = (struct ada_softc *)periph->softc;
	cam_periph_lock(periph);
	secsize = softc->params.secsize;
	lba = offset / secsize;
	count = length / secsize;

	if ((softc->flags & ADA_FLAG_PACK_INVALID) != 0) {
		cam_periph_unlock(periph);
		return (ENXIO);
	}

	if (length > 0) {
		xpt_setup_ccb(&ccb.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
		ccb.ccb_h.ccb_state = ADA_CCB_DUMP;
		cam_fill_ataio(&ccb.ataio,
		    0,
		    adadone,
		    CAM_DIR_OUT,
		    0,
		    (u_int8_t *) virtual,
		    length,
		    ada_default_timeout*1000);
		if ((softc->flags & ADA_FLAG_CAN_48BIT) &&
		    (lba + count >= ATA_MAX_28BIT_LBA ||
		    count >= 256)) {
			ata_48bit_cmd(&ccb.ataio, ATA_WRITE_DMA48,
			    0, lba, count);
		} else {
			ata_28bit_cmd(&ccb.ataio, ATA_WRITE_DMA,
			    0, lba, count);
		}
		xpt_polled_action(&ccb);

		if ((ccb.ataio.ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
			printf("Aborting dump due to I/O error.\n");
			cam_periph_unlock(periph);
			return(EIO);
		}
		cam_periph_unlock(periph);
		return(0);
	}

	if (softc->flags & ADA_FLAG_CAN_FLUSHCACHE) {
		xpt_setup_ccb(&ccb.ccb_h, periph->path, CAM_PRIORITY_NORMAL);

		ccb.ccb_h.ccb_state = ADA_CCB_DUMP;
		cam_fill_ataio(&ccb.ataio,
				    1,
				    adadone,
				    CAM_DIR_NONE,
				    0,
				    NULL,
				    0,
				    ada_default_timeout*1000);

		if (softc->flags & ADA_FLAG_CAN_48BIT)
			ata_48bit_cmd(&ccb.ataio, ATA_FLUSHCACHE48, 0, 0, 0);
		else
			ata_28bit_cmd(&ccb.ataio, ATA_FLUSHCACHE, 0, 0, 0);
		xpt_polled_action(&ccb);

		if ((ccb.ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP)
			xpt_print(periph->path, "Synchronize cache failed\n");

		if ((ccb.ccb_h.status & CAM_DEV_QFRZN) != 0)
			cam_release_devq(ccb.ccb_h.path,
					 /*relsim_flags*/0,
					 /*reduction*/0,
					 /*timeout*/0,
					 /*getcount_only*/0);
	}
	cam_periph_unlock(periph);
	return (0);
}

static void
adainit(void)
{
	cam_status status;

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

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

		/* Register our event handlers */
		if ((EVENTHANDLER_REGISTER(power_suspend, adasuspend,
					   NULL, EVENTHANDLER_PRI_LAST)) == NULL)
		    printf("adainit: power event registration failed!\n");
		if ((EVENTHANDLER_REGISTER(power_resume, adaresume,
					   NULL, EVENTHANDLER_PRI_LAST)) == NULL)
		    printf("adainit: power event registration failed!\n");
		if ((EVENTHANDLER_REGISTER(shutdown_post_sync, adashutdown,
					   NULL, SHUTDOWN_PRI_DEFAULT)) == NULL)
		    printf("adainit: shutdown event registration failed!\n");
	}
}

static void
adaoninvalidate(struct cam_periph *periph)
{
	struct ada_softc *softc;

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

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

	softc->flags |= ADA_FLAG_PACK_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);
	bioq_flush(&softc->trim_queue, NULL, ENXIO);

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

static void
adacleanup(struct cam_periph *periph)
{
	struct ada_softc *softc;

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

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

	/*
	 * If we can't free the sysctl tree, oh well...
	 */
	if ((softc->flags & ADA_FLAG_SCTX_INIT) != 0
	    && sysctl_ctx_free(&softc->sysctl_ctx) != 0) {
		xpt_print(periph->path, "can't remove sysctl context\n");
	}

	disk_destroy(softc->disk);
	callout_drain(&softc->sendordered_c);
	free(softc, M_DEVBUF);
	cam_periph_lock(periph);
}

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

	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 (cgd->protocol != PROTO_ATA)
			break;

		/*
		 * Allocate a peripheral instance for
		 * this device and start the probe
		 * process.
		 */
		status = cam_periph_alloc(adaregister, adaoninvalidate,
					  adacleanup, adastart,
					  "ada", CAM_PERIPH_BIO,
					  cgd->ccb_h.path, adaasync,
					  AC_FOUND_DEVICE, cgd);

		if (status != CAM_REQ_CMP
		 && status != CAM_REQ_INPROG)
			printf("adaasync: Unable to attach to new device "
				"due to status 0x%x\n", status);
		break;
	}
	case AC_SENT_BDR:
	case AC_BUS_RESET:
	{
		struct ccb_getdev cgd;

		softc = (struct ada_softc *)periph->softc;
		cam_periph_async(periph, code, path, arg);
		if (ada_write_cache < 0 && softc->write_cache < 0)
			break;
		if (softc->state != ADA_STATE_NORMAL)
			break;
		xpt_setup_ccb(&cgd.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
		cgd.ccb_h.func_code = XPT_GDEV_TYPE;
		xpt_action((union ccb *)&cgd);
		if ((cgd.ident_data.support.command1 & ATA_SUPPORT_WRITECACHE) == 0)
			break;
		softc->state = ADA_STATE_WCACHE;
		cam_periph_acquire(periph);
		cam_freeze_devq_arg(periph->path,
		    RELSIM_RELEASE_RUNLEVEL, CAM_RL_DEV + 1);
		xpt_schedule(periph, CAM_PRIORITY_DEV);
	}
	default:
		cam_periph_async(periph, code, path, arg);
		break;
	}
}

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

	periph = (struct cam_periph *)context;

	/* periph was held for us when this task was enqueued */
	if (periph->flags & CAM_PERIPH_INVALID) {
		cam_periph_release(periph);
		return;
	}

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

	sysctl_ctx_init(&softc->sysctl_ctx);
	softc->flags |= ADA_FLAG_SCTX_INIT;
	softc->sysctl_tree = SYSCTL_ADD_NODE(&softc->sysctl_ctx,
		SYSCTL_STATIC_CHILDREN(_kern_cam_ada), OID_AUTO, tmpstr2,
		CTLFLAG_RD, 0, tmpstr);
	if (softc->sysctl_tree == NULL) {
		printf("adasysctlinit: unable to allocate sysctl tree\n");
		cam_periph_release(periph);
		return;
	}

	SYSCTL_ADD_INT(&softc->sysctl_ctx, SYSCTL_CHILDREN(softc->sysctl_tree),
		OID_AUTO, "write_cache", CTLFLAG_RW | CTLFLAG_MPSAFE,
		&softc->write_cache, 0, "Enable disk write cache.");
#ifdef ADA_TEST_FAILURE
	/*
	 * Add a 'door bell' sysctl which allows one to set it from userland
	 * and cause something bad to happen.  For the moment, we only allow
	 * whacking the next read or write.
	 */
	SYSCTL_ADD_INT(&softc->sysctl_ctx, SYSCTL_CHILDREN(softc->sysctl_tree),
		OID_AUTO, "force_read_error", CTLFLAG_RW | CTLFLAG_MPSAFE,
		&softc->force_read_error, 0,
		"Force a read error for the next N reads.");
	SYSCTL_ADD_INT(&softc->sysctl_ctx, SYSCTL_CHILDREN(softc->sysctl_tree),
		OID_AUTO, "force_write_error", CTLFLAG_RW | CTLFLAG_MPSAFE,
		&softc->force_write_error, 0,
		"Force a write error for the next N writes.");
	SYSCTL_ADD_INT(&softc->sysctl_ctx, SYSCTL_CHILDREN(softc->sysctl_tree),
		OID_AUTO, "periodic_read_error", CTLFLAG_RW | CTLFLAG_MPSAFE,
		&softc->periodic_read_error, 0,
		"Force a read error every N reads (don't set too low).");
#endif
	cam_periph_release(periph);
}

static cam_status
adaregister(struct cam_periph *periph, void *arg)
{
	struct ada_softc *softc;
	struct ccb_pathinq cpi;
	struct ccb_getdev *cgd;
	char   announce_buf[80];
	struct disk_params *dp;
	caddr_t match;
	u_int maxio;

	cgd = (struct ccb_getdev *)arg;
	if (periph == NULL) {
		printf("adaregister: periph was NULL!!\n");
		return(CAM_REQ_CMP_ERR);
	}

	if (cgd == NULL) {
		printf("adaregister: no getdev CCB, can't register device\n");
		return(CAM_REQ_CMP_ERR);
	}

	softc = (struct ada_softc *)malloc(sizeof(*softc), M_DEVBUF,
	    M_NOWAIT|M_ZERO);

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

	bioq_init(&softc->bio_queue);
	bioq_init(&softc->trim_queue);

	if (cgd->ident_data.capabilities1 & ATA_SUPPORT_DMA)
		softc->flags |= ADA_FLAG_CAN_DMA;
	if (cgd->ident_data.support.command2 & ATA_SUPPORT_ADDRESS48)
		softc->flags |= ADA_FLAG_CAN_48BIT;
	if (cgd->ident_data.support.command2 & ATA_SUPPORT_FLUSHCACHE)
		softc->flags |= ADA_FLAG_CAN_FLUSHCACHE;
	if (cgd->ident_data.support.command1 & ATA_SUPPORT_POWERMGT)
		softc->flags |= ADA_FLAG_CAN_POWERMGT;
	if (cgd->ident_data.satacapabilities & ATA_SUPPORT_NCQ &&
	    cgd->inq_flags & SID_CmdQue)
		softc->flags |= ADA_FLAG_CAN_NCQ;
	if (cgd->ident_data.support_dsm & ATA_SUPPORT_DSM_TRIM) {
		softc->flags |= ADA_FLAG_CAN_TRIM;
		softc->trim_max_ranges = TRIM_MAX_RANGES;
		if (cgd->ident_data.max_dsm_blocks != 0) {
			softc->trim_max_ranges =
			    min(cgd->ident_data.max_dsm_blocks * 64,
				softc->trim_max_ranges);
		}
	}
	if (cgd->ident_data.support.command2 & ATA_SUPPORT_CFA)
		softc->flags |= ADA_FLAG_CAN_CFA;

	periph->softc = softc;

	/*
	 * See if this device has any quirks.
	 */
	match = cam_quirkmatch((caddr_t)&cgd->ident_data,
			       (caddr_t)ada_quirk_table,
			       sizeof(ada_quirk_table)/sizeof(*ada_quirk_table),
			       sizeof(*ada_quirk_table), ata_identify_match);
	if (match != NULL)
		softc->quirks = ((struct ada_quirk_entry *)match)->quirks;
	else
		softc->quirks = ADA_Q_NONE;

	bzero(&cpi, sizeof(cpi));
	xpt_setup_ccb(&cpi.ccb_h, periph->path, CAM_PRIORITY_NONE);
	cpi.ccb_h.func_code = XPT_PATH_INQ;
	xpt_action((union ccb *)&cpi);

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

	/*
	 * Register this media as a disk
	 */
	(void)cam_periph_hold(periph, PRIBIO);
	mtx_unlock(periph->sim->mtx);
	softc->write_cache = -1;
	snprintf(announce_buf, sizeof(announce_buf),
	    "kern.cam.ada.%d.write_cache", periph->unit_number);
	TUNABLE_INT_FETCH(announce_buf, &softc->write_cache);
	adagetparams(periph, cgd);
	softc->disk = disk_alloc();
	softc->disk->d_devstat = devstat_new_entry(periph->periph_name,
			  periph->unit_number, softc->params.secsize,
			  DEVSTAT_ALL_SUPPORTED,
			  DEVSTAT_TYPE_DIRECT |
			  XPORT_DEVSTAT_TYPE(cpi.transport),
			  DEVSTAT_PRIORITY_DISK);
	softc->disk->d_open = adaopen;
	softc->disk->d_close = adaclose;
	softc->disk->d_strategy = adastrategy;
	softc->disk->d_dump = adadump;
	softc->disk->d_name = "ada";
	softc->disk->d_drv1 = periph;
	maxio = cpi.maxio;		/* Honor max I/O size of SIM */
	if (maxio == 0)
		maxio = DFLTPHYS;	/* traditional default */
	else if (maxio > MAXPHYS)
		maxio = MAXPHYS;	/* for safety */
	if (softc->flags & ADA_FLAG_CAN_48BIT)
		maxio = min(maxio, 65536 * softc->params.secsize);
	else					/* 28bit ATA command limit */
		maxio = min(maxio, 256 * softc->params.secsize);
	softc->disk->d_maxsize = maxio;
	softc->disk->d_unit = periph->unit_number;
	softc->disk->d_flags = 0;
	if (softc->flags & ADA_FLAG_CAN_FLUSHCACHE)
		softc->disk->d_flags |= DISKFLAG_CANFLUSHCACHE;
	if ((softc->flags & ADA_FLAG_CAN_TRIM) ||
	    ((softc->flags & ADA_FLAG_CAN_CFA) &&
	    !(softc->flags & ADA_FLAG_CAN_48BIT)))
		softc->disk->d_flags |= DISKFLAG_CANDELETE;
	strlcpy(softc->disk->d_ident, cgd->serial_num,
	    MIN(sizeof(softc->disk->d_ident), cgd->serial_num_len + 1));
	strlcpy(softc->disk->d_descr, cgd->ident_data.model,
	    MIN(sizeof(softc->disk->d_descr), sizeof(cgd->ident_data.model)));
	softc->disk->d_hba_vendor = cpi.hba_vendor;
	softc->disk->d_hba_device = cpi.hba_device;
	softc->disk->d_hba_subvendor = cpi.hba_subvendor;
	softc->disk->d_hba_subdevice = cpi.hba_subdevice;

	softc->disk->d_sectorsize = softc->params.secsize;
	softc->disk->d_mediasize = (off_t)softc->params.sectors *
	    softc->params.secsize;
	if (ata_physical_sector_size(&cgd->ident_data) !=
	    softc->params.secsize) {
		softc->disk->d_stripesize =
		    ata_physical_sector_size(&cgd->ident_data);
		softc->disk->d_stripeoffset = (softc->disk->d_stripesize -
		    ata_logical_sector_offset(&cgd->ident_data)) %
		    softc->disk->d_stripesize;
	}
	softc->disk->d_fwsectors = softc->params.secs_per_track;
	softc->disk->d_fwheads = softc->params.heads;
	ata_disk_firmware_geom_adjust(softc->disk);

	disk_create(softc->disk, DISK_VERSION);
	mtx_lock(periph->sim->mtx);
	cam_periph_unhold(periph);

	dp = &softc->params;
	snprintf(announce_buf, sizeof(announce_buf),
		"%juMB (%ju %u byte sectors: %dH %dS/T %dC)",
		(uintmax_t)(((uintmax_t)dp->secsize *
		dp->sectors) / (1024*1024)),
		(uintmax_t)dp->sectors,
		dp->secsize, dp->heads,
		dp->secs_per_track, dp->cylinders);
	xpt_announce_periph(periph, announce_buf);

	/*
	 * Create our sysctl variables, now that we know
	 * we have successfully attached.
	 */
	cam_periph_acquire(periph);
	taskqueue_enqueue(taskqueue_thread, &softc->sysctl_task);

	/*
	 * Add async callbacks for bus reset and
	 * bus device reset calls.  I don't bother
	 * checking if this fails as, in most cases,
	 * the system will function just fine without
	 * them and the only alternative would be to
	 * not attach the device on failure.
	 */
	xpt_register_async(AC_SENT_BDR | AC_BUS_RESET | AC_LOST_DEVICE,
			   adaasync, periph, periph->path);

	/*
	 * Schedule a periodic event to occasionally send an
	 * ordered tag to a device.
	 */
	callout_init_mtx(&softc->sendordered_c, periph->sim->mtx, 0);
	callout_reset(&softc->sendordered_c,
	    (ADA_DEFAULT_TIMEOUT * hz) / ADA_ORDEREDTAG_INTERVAL,
	    adasendorderedtag, softc);

	if ((ada_write_cache >= 0 || softc->write_cache >= 0) &&
	    cgd->ident_data.support.command1 & ATA_SUPPORT_WRITECACHE) {
		softc->state = ADA_STATE_WCACHE;
		cam_periph_acquire(periph);
		cam_freeze_devq_arg(periph->path,
		    RELSIM_RELEASE_RUNLEVEL, CAM_RL_DEV + 1);
		xpt_schedule(periph, CAM_PRIORITY_DEV);
	} else
		softc->state = ADA_STATE_NORMAL;

	return(CAM_REQ_CMP);
}

static void
adastart(struct cam_periph *periph, union ccb *start_ccb)
{
	struct ada_softc *softc = (struct ada_softc *)periph->softc;
	struct ccb_ataio *ataio = &start_ccb->ataio;

	switch (softc->state) {
	case ADA_STATE_NORMAL:
	{
		struct bio *bp;
		u_int8_t tag_code;

		/* Execute immediate CCB if waiting. */
		if (periph->immediate_priority <= periph->pinfo.priority) {
			CAM_DEBUG_PRINT(CAM_DEBUG_SUBTRACE,
					("queuing for immediate ccb\n"));
			start_ccb->ccb_h.ccb_state = ADA_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);
			/* Have more work to do, so ensure we stay scheduled */
			adaschedule(periph);
			break;
		}
		/* Run TRIM if not running yet. */
		if (!softc->trim_running &&
		    (bp = bioq_first(&softc->trim_queue)) != 0) {
			struct trim_request *req = &softc->trim_req;
			struct bio *bp1;
			int bps = 0, ranges = 0;

			softc->trim_running = 1;
			bzero(req, sizeof(*req));
			bp1 = bp;
			do {
				uint64_t lba = bp1->bio_pblkno;
				int count = bp1->bio_bcount /
				    softc->params.secsize;

				bioq_remove(&softc->trim_queue, bp1);
				while (count > 0) {
					int c = min(count, 0xffff);
					int off = ranges * 8;

					req->data[off + 0] = lba & 0xff;
					req->data[off + 1] = (lba >> 8) & 0xff;
					req->data[off + 2] = (lba >> 16) & 0xff;
					req->data[off + 3] = (lba >> 24) & 0xff;
					req->data[off + 4] = (lba >> 32) & 0xff;
					req->data[off + 5] = (lba >> 40) & 0xff;
					req->data[off + 6] = c & 0xff;
					req->data[off + 7] = (c >> 8) & 0xff;
					lba += c;
					count -= c;
					ranges++;
				}
				req->bps[bps++] = bp1;
				bp1 = bioq_first(&softc->trim_queue);
				if (bp1 == NULL ||
				    bp1->bio_bcount / softc->params.secsize >
				    (softc->trim_max_ranges - ranges) * 0xffff)
					break;
			} while (1);
			cam_fill_ataio(ataio,
			    ada_retry_count,
			    adadone,
			    CAM_DIR_OUT,
			    0,
			    req->data,
			    ((ranges + 63) / 64) * 512,
			    ada_default_timeout * 1000);
			ata_48bit_cmd(ataio, ATA_DATA_SET_MANAGEMENT,
			    ATA_DSM_TRIM, 0, (ranges + 63) / 64);
			start_ccb->ccb_h.ccb_state = ADA_CCB_TRIM;
			goto out;
		}
		/* Run regular command. */
		bp = bioq_first(&softc->bio_queue);
		if (bp == NULL) {
			xpt_release_ccb(start_ccb);
			break;
		}
		bioq_remove(&softc->bio_queue, bp);

		if ((bp->bio_flags & BIO_ORDERED) != 0
		 || (softc->flags & ADA_FLAG_NEED_OTAG) != 0) {
			softc->flags &= ~ADA_FLAG_NEED_OTAG;
			softc->ordered_tag_count++;
			tag_code = 0;
		} else {
			tag_code = 1;
		}
		switch (bp->bio_cmd) {
		case BIO_READ:
		case BIO_WRITE:
		{
			uint64_t lba = bp->bio_pblkno;
			uint16_t count = bp->bio_bcount / softc->params.secsize;
#ifdef ADA_TEST_FAILURE
			int fail = 0;

			/*
			 * Support the failure ioctls.  If the command is a
			 * read, and there are pending forced read errors, or
			 * if a write and pending write errors, then fail this
			 * operation with EIO.  This is useful for testing
			 * purposes.  Also, support having every Nth read fail.
			 *
			 * This is a rather blunt tool.
			 */
			if (bp->bio_cmd == BIO_READ) {
				if (softc->force_read_error) {
					softc->force_read_error--;
					fail = 1;
				}
				if (softc->periodic_read_error > 0) {
					if (++softc->periodic_read_count >=
					    softc->periodic_read_error) {
						softc->periodic_read_count = 0;
						fail = 1;
					}
				}
			} else {
				if (softc->force_write_error) {
					softc->force_write_error--;
					fail = 1;
				}
			}
			if (fail) {
				bp->bio_error = EIO;
				bp->bio_flags |= BIO_ERROR;
				biodone(bp);
				xpt_release_ccb(start_ccb);
				adaschedule(periph);
				return;
			}
#endif
			cam_fill_ataio(ataio,
			    ada_retry_count,
			    adadone,
			    bp->bio_cmd == BIO_READ ?
			        CAM_DIR_IN : CAM_DIR_OUT,
			    tag_code,
			    bp->bio_data,
			    bp->bio_bcount,
			    ada_default_timeout*1000);

			if ((softc->flags & ADA_FLAG_CAN_NCQ) && tag_code) {
				if (bp->bio_cmd == BIO_READ) {
					ata_ncq_cmd(ataio, ATA_READ_FPDMA_QUEUED,
					    lba, count);
				} else {
					ata_ncq_cmd(ataio, ATA_WRITE_FPDMA_QUEUED,
					    lba, count);
				}
			} else if ((softc->flags & ADA_FLAG_CAN_48BIT) &&
			    (lba + count >= ATA_MAX_28BIT_LBA ||
			    count > 256)) {
				if (softc->flags & ADA_FLAG_CAN_DMA) {
					if (bp->bio_cmd == BIO_READ) {
						ata_48bit_cmd(ataio, ATA_READ_DMA48,
						    0, lba, count);
					} else {
						ata_48bit_cmd(ataio, ATA_WRITE_DMA48,
						    0, lba, count);
					}
				} else {
					if (bp->bio_cmd == BIO_READ) {
						ata_48bit_cmd(ataio, ATA_READ_MUL48,
						    0, lba, count);
					} else {
						ata_48bit_cmd(ataio, ATA_WRITE_MUL48,
						    0, lba, count);
					}
				}
			} else {
				if (count == 256)
					count = 0;
				if (softc->flags & ADA_FLAG_CAN_DMA) {
					if (bp->bio_cmd == BIO_READ) {
						ata_28bit_cmd(ataio, ATA_READ_DMA,
						    0, lba, count);
					} else {
						ata_28bit_cmd(ataio, ATA_WRITE_DMA,
						    0, lba, count);
					}
				} else {
					if (bp->bio_cmd == BIO_READ) {
						ata_28bit_cmd(ataio, ATA_READ_MUL,
						    0, lba, count);
					} else {
						ata_28bit_cmd(ataio, ATA_WRITE_MUL,
						    0, lba, count);
					}
				}
			}
			break;
		}
		case BIO_DELETE:
		{
			uint64_t lba = bp->bio_pblkno;
			uint16_t count = bp->bio_bcount / softc->params.secsize;

			cam_fill_ataio(ataio,
			    ada_retry_count,
			    adadone,
			    CAM_DIR_NONE,
			    0,
			    NULL,
			    0,
			    ada_default_timeout*1000);

			if (count >= 256)
				count = 0;
			ata_28bit_cmd(ataio, ATA_CFA_ERASE, 0, lba, count);
			break;
		}
		case BIO_FLUSH:
			cam_fill_ataio(ataio,
			    1,
			    adadone,
			    CAM_DIR_NONE,
			    0,
			    NULL,
			    0,
			    ada_default_timeout*1000);

			if (softc->flags & ADA_FLAG_CAN_48BIT)
				ata_48bit_cmd(ataio, ATA_FLUSHCACHE48, 0, 0, 0);
			else
				ata_28bit_cmd(ataio, ATA_FLUSHCACHE, 0, 0, 0);
			break;
		}
		start_ccb->ccb_h.ccb_state = ADA_CCB_BUFFER_IO;
out:
		start_ccb->ccb_h.ccb_bp = bp;
		softc->outstanding_cmds++;
		xpt_action(start_ccb);

		/* May have more work to do, so ensure we stay scheduled */
		adaschedule(periph);
		break;
	}
	case ADA_STATE_WCACHE:
	{
		cam_fill_ataio(ataio,
		    1,
		    adadone,
		    CAM_DIR_NONE,
		    0,
		    NULL,
		    0,
		    ada_default_timeout*1000);

		ata_28bit_cmd(ataio, ATA_SETFEATURES, (softc->write_cache > 0 ||
		     (softc->write_cache < 0 && ada_write_cache)) ?
		    ATA_SF_ENAB_WCACHE : ATA_SF_DIS_WCACHE, 0, 0);
		start_ccb->ccb_h.ccb_state = ADA_CCB_WCACHE;
		xpt_action(start_ccb);
		break;
	}
	}
}

static void
adadone(struct cam_periph *periph, union ccb *done_ccb)
{
	struct ada_softc *softc;
	struct ccb_ataio *ataio;

	softc = (struct ada_softc *)periph->softc;
	ataio = &done_ccb->ataio;
	switch (ataio->ccb_h.ccb_state & ADA_CCB_TYPE_MASK) {
	case ADA_CCB_BUFFER_IO:
	case ADA_CCB_TRIM:
	{
		struct bio *bp;

		bp = (struct bio *)done_ccb->ccb_h.ccb_bp;
		if ((done_ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
			int error;

			error = adaerror(done_ccb, 0, 0);
			if (error == ERESTART) {
				/* A retry was scheduled, so just return. */
				return;
			}
			if (error != 0) {
				if (error == ENXIO) {
					/*
					 * Catastrophic error.  Mark our pack as
					 * invalid.
					 */
					/*
					 * XXX See if this is really a media
					 * XXX change first?
					 */
					xpt_print(periph->path,
					    "Invalidating pack\n");
					softc->flags |= ADA_FLAG_PACK_INVALID;
				}
				bp->bio_error = error;
				bp->bio_resid = bp->bio_bcount;
				bp->bio_flags |= BIO_ERROR;
			} else {
				bp->bio_resid = ataio->resid;
				bp->bio_error = 0;
				if (bp->bio_resid != 0)
					bp->bio_flags |= BIO_ERROR;
			}
			if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
				cam_release_devq(done_ccb->ccb_h.path,
						 /*relsim_flags*/0,
						 /*reduction*/0,
						 /*timeout*/0,
						 /*getcount_only*/0);
		} else {
			if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
				panic("REQ_CMP with QFRZN");
			bp->bio_resid = ataio->resid;
			if (ataio->resid > 0)
				bp->bio_flags |= BIO_ERROR;
		}
		softc->outstanding_cmds--;
		if (softc->outstanding_cmds == 0)
			softc->flags |= ADA_FLAG_WENT_IDLE;
		if ((ataio->ccb_h.ccb_state & ADA_CCB_TYPE_MASK) ==
		    ADA_CCB_TRIM) {
			struct trim_request *req =
			    (struct trim_request *)ataio->data_ptr;
			int i;

			for (i = 1; i < softc->trim_max_ranges &&
			    req->bps[i]; i++) {
				struct bio *bp1 = req->bps[i];

				bp1->bio_resid = bp->bio_resid;
				bp1->bio_error = bp->bio_error;
				if (bp->bio_flags & BIO_ERROR)
					bp1->bio_flags |= BIO_ERROR;
				biodone(bp1);
			}
			softc->trim_running = 0;
			biodone(bp);
			adaschedule(periph);
		} else
			biodone(bp);
		break;
	}
	case ADA_CCB_WCACHE:
	{
		if ((done_ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
			if (adaerror(done_ccb, 0, 0) == ERESTART) {
				return;
			} else if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) {
				cam_release_devq(done_ccb->ccb_h.path,
				    /*relsim_flags*/0,
				    /*reduction*/0,
				    /*timeout*/0,
				    /*getcount_only*/0);
			}
		}

		softc->state = ADA_STATE_NORMAL;
		/*
		 * Since our peripheral may be invalidated by an error
		 * above or an external event, we must release our CCB
		 * before releasing the reference on the peripheral.
		 * The peripheral will only go away once the last reference
		 * is removed, and we need it around for the CCB release
		 * operation.
		 */
		xpt_release_ccb(done_ccb);
		cam_release_devq(periph->path,
		    RELSIM_RELEASE_RUNLEVEL, 0, CAM_RL_DEV + 1, FALSE);
		adaschedule(periph);
		cam_periph_release_locked(periph);
		return;
	}
	case ADA_CCB_WAITING:
	{
		/* Caller will release the CCB */
		wakeup(&done_ccb->ccb_h.cbfcnp);
		return;
	}
	case ADA_CCB_DUMP:
		/* No-op.  We're polling */
		return;
	default:
		break;
	}
	xpt_release_ccb(done_ccb);
}

static int
adaerror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
{
	struct ada_softc	  *softc;
	struct cam_periph *periph;

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

	return(cam_periph_error(ccb, cam_flags, sense_flags, NULL));
}

static void
adagetparams(struct cam_periph *periph, struct ccb_getdev *cgd)
{
	struct ada_softc *softc = (struct ada_softc *)periph->softc;
	struct disk_params *dp = &softc->params;
	u_int64_t lbasize48;
	u_int32_t lbasize;

	dp->secsize = ata_logical_sector_size(&cgd->ident_data);
	if ((cgd->ident_data.atavalid & ATA_FLAG_54_58) &&
		cgd->ident_data.current_heads && cgd->ident_data.current_sectors) {
		dp->heads = cgd->ident_data.current_heads;
		dp->secs_per_track = cgd->ident_data.current_sectors;
		dp->cylinders = cgd->ident_data.cylinders;
		dp->sectors = (u_int32_t)cgd->ident_data.current_size_1 |
			  ((u_int32_t)cgd->ident_data.current_size_2 << 16);
	} else {
		dp->heads = cgd->ident_data.heads;
		dp->secs_per_track = cgd->ident_data.sectors;
		dp->cylinders = cgd->ident_data.cylinders;
		dp->sectors = cgd->ident_data.cylinders * dp->heads * dp->secs_per_track;
	}
	lbasize = (u_int32_t)cgd->ident_data.lba_size_1 |
		  ((u_int32_t)cgd->ident_data.lba_size_2 << 16);

	/* use the 28bit LBA size if valid or bigger than the CHS mapping */
	if (cgd->ident_data.cylinders == 16383 || dp->sectors < lbasize)
		dp->sectors = lbasize;

	/* use the 48bit LBA size if valid */
	lbasize48 = ((u_int64_t)cgd->ident_data.lba_size48_1) |
		    ((u_int64_t)cgd->ident_data.lba_size48_2 << 16) |
		    ((u_int64_t)cgd->ident_data.lba_size48_3 << 32) |
		    ((u_int64_t)cgd->ident_data.lba_size48_4 << 48);
	if ((cgd->ident_data.support.command2 & ATA_SUPPORT_ADDRESS48) &&
	    lbasize48 > ATA_MAX_28BIT_LBA)
		dp->sectors = lbasize48;
}

static void
adasendorderedtag(void *arg)
{
	struct ada_softc *softc = arg;

	if (ada_send_ordered) {
		if ((softc->ordered_tag_count == 0)
		 && ((softc->flags & ADA_FLAG_WENT_IDLE) == 0)) {
			softc->flags |= ADA_FLAG_NEED_OTAG;
		}
		if (softc->outstanding_cmds > 0)
			softc->flags &= ~ADA_FLAG_WENT_IDLE;

		softc->ordered_tag_count = 0;
	}
	/* Queue us up again */
	callout_reset(&softc->sendordered_c,
	    (ADA_DEFAULT_TIMEOUT * hz) / ADA_ORDEREDTAG_INTERVAL,
	    adasendorderedtag, softc);
}

/*
 * Step through all ADA peripheral drivers, and if the device is still open,
 * sync the disk cache to physical media.
 */
static void
adaflush(void)
{
	struct cam_periph *periph;
	struct ada_softc *softc;

	TAILQ_FOREACH(periph, &adadriver.units, unit_links) {
		union ccb ccb;

		/* If we paniced with lock held - not recurse here. */
		if (cam_periph_owned(periph))
			continue;
		cam_periph_lock(periph);
		softc = (struct ada_softc *)periph->softc;
		/*
		 * We only sync the cache if the drive is still open, and
		 * if the drive is capable of it..
		 */
		if (((softc->flags & ADA_FLAG_OPEN) == 0) ||
		    (softc->flags & ADA_FLAG_CAN_FLUSHCACHE) == 0) {
			cam_periph_unlock(periph);
			continue;
		}

		xpt_setup_ccb(&ccb.ccb_h, periph->path, CAM_PRIORITY_NORMAL);

		ccb.ccb_h.ccb_state = ADA_CCB_DUMP;
		cam_fill_ataio(&ccb.ataio,
				    1,
				    adadone,
				    CAM_DIR_NONE,
				    0,
				    NULL,
				    0,
				    ada_default_timeout*1000);

		if (softc->flags & ADA_FLAG_CAN_48BIT)
			ata_48bit_cmd(&ccb.ataio, ATA_FLUSHCACHE48, 0, 0, 0);
		else
			ata_28bit_cmd(&ccb.ataio, ATA_FLUSHCACHE, 0, 0, 0);
		xpt_polled_action(&ccb);

		if ((ccb.ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP)
			xpt_print(periph->path, "Synchronize cache failed\n");

		if ((ccb.ccb_h.status & CAM_DEV_QFRZN) != 0)
			cam_release_devq(ccb.ccb_h.path,
					 /*relsim_flags*/0,
					 /*reduction*/0,
					 /*timeout*/0,
					 /*getcount_only*/0);
		cam_periph_unlock(periph);
	}
}

static void
adaspindown(uint8_t cmd, int flags)
{
	struct cam_periph *periph;
	struct ada_softc *softc;

	TAILQ_FOREACH(periph, &adadriver.units, unit_links) {
		union ccb ccb;

		/* If we paniced with lock held - not recurse here. */
		if (cam_periph_owned(periph))
			continue;
		cam_periph_lock(periph);
		softc = (struct ada_softc *)periph->softc;
		/*
		 * We only spin-down the drive if it is capable of it..
		 */
		if ((softc->flags & ADA_FLAG_CAN_POWERMGT) == 0) {
			cam_periph_unlock(periph);
			continue;
		}

		if (bootverbose)
			xpt_print(periph->path, "spin-down\n");

		xpt_setup_ccb(&ccb.ccb_h, periph->path, CAM_PRIORITY_NORMAL);

		ccb.ccb_h.ccb_state = ADA_CCB_DUMP;
		cam_fill_ataio(&ccb.ataio,
				    1,
				    adadone,
				    CAM_DIR_NONE | flags,
				    0,
				    NULL,
				    0,
				    ada_default_timeout*1000);

		ata_28bit_cmd(&ccb.ataio, cmd, 0, 0, 0);
		xpt_polled_action(&ccb);

		if ((ccb.ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP)
			xpt_print(periph->path, "Spin-down disk failed\n");

		if ((ccb.ccb_h.status & CAM_DEV_QFRZN) != 0)
			cam_release_devq(ccb.ccb_h.path,
					 /*relsim_flags*/0,
					 /*reduction*/0,
					 /*timeout*/0,
					 /*getcount_only*/0);
		cam_periph_unlock(periph);
	}
}

static void
adashutdown(void *arg, int howto)
{

	adaflush();
	if (ada_spindown_shutdown != 0 &&
	    (howto & (RB_HALT | RB_POWEROFF)) != 0)
		adaspindown(ATA_STANDBY_IMMEDIATE, 0);
}

static void
adasuspend(void *arg)
{

	adaflush();
	if (ada_spindown_suspend != 0)
		adaspindown(ATA_SLEEP, CAM_DEV_QFREEZE);
}

static void
adaresume(void *arg)
{
	struct cam_periph *periph;
	struct ada_softc *softc;

	if (ada_spindown_suspend == 0)
		return;

	TAILQ_FOREACH(periph, &adadriver.units, unit_links) {
		cam_periph_lock(periph);
		softc = (struct ada_softc *)periph->softc;
		/*
		 * We only spin-down the drive if it is capable of it..
		 */
		if ((softc->flags & ADA_FLAG_CAN_POWERMGT) == 0) {
			cam_periph_unlock(periph);
			continue;
		}

		if (bootverbose)
			xpt_print(periph->path, "resume\n");

		/*
		 * Drop freeze taken due to CAM_DEV_QFREEZE flag set on
		 * sleep request.
		 */
		cam_release_devq(periph->path,
			 /*relsim_flags*/0,
			 /*openings*/0,
			 /*timeout*/0,
			 /*getcount_only*/0);

		cam_periph_unlock(periph);
	}
}

#endif /* _KERNEL */