xref: /freebsd/sys/cam/ata/ata_xpt.c (revision c8039fc6)

/*-
 * 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("$FreeBSD$");

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/endian.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/time.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <sys/md5.h>
#include <sys/interrupt.h>
#include <sys/sbuf.h>

#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/sysctl.h>

#ifdef PC98
#include <pc98/pc98/pc98_machdep.h>	/* geometry translation */
#endif

#include <cam/cam.h>
#include <cam/cam_ccb.h>
#include <cam/cam_queue.h>
#include <cam/cam_periph.h>
#include <cam/cam_sim.h>
#include <cam/cam_xpt.h>
#include <cam/cam_xpt_sim.h>
#include <cam/cam_xpt_periph.h>
#include <cam/cam_xpt_internal.h>
#include <cam/cam_debug.h>

#include <cam/scsi/scsi_all.h>
#include <cam/scsi/scsi_message.h>
#include <cam/ata/ata_all.h>
#include <machine/stdarg.h>	/* for xpt_print below */
#include "opt_cam.h"

struct ata_quirk_entry {
	struct scsi_inquiry_pattern inq_pat;
	u_int8_t quirks;
#define	CAM_QUIRK_MAXTAGS	0x01
	u_int maxtags;
};

static periph_init_t probe_periph_init;

static struct periph_driver probe_driver =
{
	probe_periph_init, "aprobe",
	TAILQ_HEAD_INITIALIZER(probe_driver.units), /* generation */ 0,
	CAM_PERIPH_DRV_EARLY
};

PERIPHDRIVER_DECLARE(aprobe, probe_driver);

typedef enum {
	PROBE_RESET,
	PROBE_IDENTIFY,
	PROBE_SETMODE,
	PROBE_SET_MULTI,
	PROBE_INQUIRY,
	PROBE_FULL_INQUIRY,
	PROBE_PM_PID,
	PROBE_PM_PRV,
	PROBE_INVALID
} probe_action;

static char *probe_action_text[] = {
	"PROBE_RESET",
	"PROBE_IDENTIFY",
	"PROBE_SETMODE",
	"PROBE_SET_MULTI",
	"PROBE_INQUIRY",
	"PROBE_FULL_INQUIRY",
	"PROBE_PM_PID",
	"PROBE_PM_PRV",
	"PROBE_INVALID"
};

#define PROBE_SET_ACTION(softc, newaction)	\
do {									\
	char **text;							\
	text = probe_action_text;					\
	CAM_DEBUG((softc)->periph->path, CAM_DEBUG_INFO,		\
	    ("Probe %s to %s\n", text[(softc)->action],			\
	    text[(newaction)]));					\
	(softc)->action = (newaction);					\
} while(0)

typedef enum {
	PROBE_NO_ANNOUNCE	= 0x04
} probe_flags;

typedef struct {
	TAILQ_HEAD(, ccb_hdr) request_ccbs;
	probe_action	action;
	union ccb	saved_ccb;
	probe_flags	flags;
	u_int8_t	digest[16];
	uint32_t	pm_pid;
	uint32_t	pm_prv;
	struct cam_periph *periph;
} probe_softc;

static struct ata_quirk_entry ata_quirk_table[] =
{
	{
		/* Default tagged queuing parameters for all devices */
		{
		  T_ANY, SIP_MEDIA_REMOVABLE|SIP_MEDIA_FIXED,
		  /*vendor*/"*", /*product*/"*", /*revision*/"*"
		},
		/*quirks*/0, /*maxtags*/0
	},
};

static const int ata_quirk_table_size =
	sizeof(ata_quirk_table) / sizeof(*ata_quirk_table);

static cam_status	proberegister(struct cam_periph *periph,
				      void *arg);
static void	 probeschedule(struct cam_periph *probe_periph);
static void	 probestart(struct cam_periph *periph, union ccb *start_ccb);
//static void	 proberequestdefaultnegotiation(struct cam_periph *periph);
//static int       proberequestbackoff(struct cam_periph *periph,
//				     struct cam_ed *device);
static void	 probedone(struct cam_periph *periph, union ccb *done_ccb);
static void	 probecleanup(struct cam_periph *periph);
static void	 ata_find_quirk(struct cam_ed *device);
static void	 ata_scan_bus(struct cam_periph *periph, union ccb *ccb);
static void	 ata_scan_lun(struct cam_periph *periph,
			       struct cam_path *path, cam_flags flags,
			       union ccb *ccb);
static void	 xptscandone(struct cam_periph *periph, union ccb *done_ccb);
static struct cam_ed *
		 ata_alloc_device(struct cam_eb *bus, struct cam_et *target,
				   lun_id_t lun_id);
static void	 ata_device_transport(struct cam_path *path);
static void	 ata_set_transfer_settings(struct ccb_trans_settings *cts,
					    struct cam_ed *device,
					    int async_update);
static void	 ata_dev_async(u_int32_t async_code,
				struct cam_eb *bus,
				struct cam_et *target,
				struct cam_ed *device,
				void *async_arg);
static void	 ata_action(union ccb *start_ccb);

static struct xpt_xport ata_xport = {
	.alloc_device = ata_alloc_device,
	.action = ata_action,
	.async = ata_dev_async,
};

struct xpt_xport *
ata_get_xport(void)
{
	return (&ata_xport);
}

static void
probe_periph_init()
{
}

static cam_status
proberegister(struct cam_periph *periph, void *arg)
{
	union ccb *request_ccb;	/* CCB representing the probe request */
	cam_status status;
	probe_softc *softc;

	request_ccb = (union ccb *)arg;
	if (periph == NULL) {
		printf("proberegister: periph was NULL!!\n");
		return(CAM_REQ_CMP_ERR);
	}

	if (request_ccb == NULL) {
		printf("proberegister: no probe CCB, "
		       "can't register device\n");
		return(CAM_REQ_CMP_ERR);
	}

	softc = (probe_softc *)malloc(sizeof(*softc), M_CAMXPT, M_NOWAIT);

	if (softc == NULL) {
		printf("proberegister: Unable to probe new device. "
		       "Unable to allocate softc\n");
		return(CAM_REQ_CMP_ERR);
	}
	TAILQ_INIT(&softc->request_ccbs);
	TAILQ_INSERT_TAIL(&softc->request_ccbs, &request_ccb->ccb_h,
			  periph_links.tqe);
	softc->flags = 0;
	periph->softc = softc;
	softc->periph = periph;
	softc->action = PROBE_INVALID;
	status = cam_periph_acquire(periph);
	if (status != CAM_REQ_CMP) {
		return (status);
	}


	/*
	 * Ensure we've waited at least a bus settle
	 * delay before attempting to probe the device.
	 * For HBAs that don't do bus resets, this won't make a difference.
	 */
	cam_periph_freeze_after_event(periph, &periph->path->bus->last_reset,
				      scsi_delay);
	probeschedule(periph);
	return(CAM_REQ_CMP);
}

static void
probeschedule(struct cam_periph *periph)
{
	struct ccb_pathinq cpi;
	union ccb *ccb;
	probe_softc *softc;

	softc = (probe_softc *)periph->softc;
	ccb = (union ccb *)TAILQ_FIRST(&softc->request_ccbs);

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

	if ((periph->path->device->flags & CAM_DEV_UNCONFIGURED) ||
	    periph->path->device->protocol == PROTO_SATAPM)
		PROBE_SET_ACTION(softc, PROBE_RESET);
	else
		PROBE_SET_ACTION(softc, PROBE_IDENTIFY);

	if (ccb->crcn.flags & CAM_EXPECT_INQ_CHANGE)
		softc->flags |= PROBE_NO_ANNOUNCE;
	else
		softc->flags &= ~PROBE_NO_ANNOUNCE;

	xpt_schedule(periph, ccb->ccb_h.pinfo.priority);
}

static void
probestart(struct cam_periph *periph, union ccb *start_ccb)
{
	struct ccb_trans_settings cts;
	struct ccb_ataio *ataio;
	struct ccb_scsiio *csio;
	probe_softc *softc;
	struct cam_path *path;
	struct ata_params *ident_buf;

	CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("probestart\n"));

	softc = (probe_softc *)periph->softc;
	path = start_ccb->ccb_h.path;
	ataio = &start_ccb->ataio;
	csio = &start_ccb->csio;
	ident_buf = &periph->path->device->ident_data;

	switch (softc->action) {
	case PROBE_RESET:
		cam_fill_ataio(ataio,
		      0,
		      probedone,
		      /*flags*/CAM_DIR_NONE,
		      0,
		      /*data_ptr*/NULL,
		      /*dxfer_len*/0,
		      (start_ccb->ccb_h.target_id == 15 ? 3 : 15) * 1000);
		ata_reset_cmd(ataio);
		break;
	case PROBE_IDENTIFY:
		if ((periph->path->device->flags & CAM_DEV_UNCONFIGURED) == 0) {
			/* Prepare check that it is the same device. */
			MD5_CTX context;

			MD5Init(&context);
			MD5Update(&context,
			    (unsigned char *)ident_buf->model,
			    sizeof(ident_buf->model));
			MD5Update(&context,
			    (unsigned char *)ident_buf->revision,
			    sizeof(ident_buf->revision));
			MD5Update(&context,
			    (unsigned char *)ident_buf->serial,
			    sizeof(ident_buf->serial));
			MD5Final(softc->digest, &context);
		}
		cam_fill_ataio(ataio,
		      1,
		      probedone,
		      /*flags*/CAM_DIR_IN,
		      0,
		      /*data_ptr*/(u_int8_t *)ident_buf,
		      /*dxfer_len*/sizeof(struct ata_params),
		      30 * 1000);
		if (periph->path->device->protocol == PROTO_ATA)
			ata_28bit_cmd(ataio, ATA_ATA_IDENTIFY, 0, 0, 0);
		else
			ata_28bit_cmd(ataio, ATA_ATAPI_IDENTIFY, 0, 0, 0);
		break;
	case PROBE_SETMODE:
	{
		int mode, wantmode;

		mode = 0;
		/* Fetch user modes from SIM. */
		bzero(&cts, sizeof(cts));
		xpt_setup_ccb(&cts.ccb_h, path, CAM_PRIORITY_NORMAL);
		cts.ccb_h.func_code = XPT_GET_TRAN_SETTINGS;
		cts.type = CTS_TYPE_USER_SETTINGS;
		xpt_action((union ccb *)&cts);
		if (path->device->transport == XPORT_ATA) {
			if (cts.xport_specific.ata.valid & CTS_ATA_VALID_MODE)
				mode = cts.xport_specific.ata.mode;
		} else {
			if (cts.xport_specific.ata.valid & CTS_SATA_VALID_MODE)
				mode = cts.xport_specific.sata.mode;
		}
negotiate:
		/* Honor device capabilities. */
		wantmode = mode = ata_max_mode(ident_buf, mode);
		/* Report modes to SIM. */
		bzero(&cts, sizeof(cts));
		xpt_setup_ccb(&cts.ccb_h, path, CAM_PRIORITY_NORMAL);
		cts.ccb_h.func_code = XPT_SET_TRAN_SETTINGS;
		cts.type = CTS_TYPE_CURRENT_SETTINGS;
		if (path->device->transport == XPORT_ATA) {
			cts.xport_specific.ata.mode = mode;
			cts.xport_specific.ata.valid = CTS_ATA_VALID_MODE;
		} else {
			cts.xport_specific.sata.mode = mode;
			cts.xport_specific.sata.valid = CTS_SATA_VALID_MODE;
		}
		xpt_action((union ccb *)&cts);
		/* Fetch user modes from SIM. */
		bzero(&cts, sizeof(cts));
		xpt_setup_ccb(&cts.ccb_h, path, CAM_PRIORITY_NORMAL);
		cts.ccb_h.func_code = XPT_GET_TRAN_SETTINGS;
		cts.type = CTS_TYPE_CURRENT_SETTINGS;
		xpt_action((union ccb *)&cts);
		if (path->device->transport == XPORT_ATA) {
			if (cts.xport_specific.ata.valid & CTS_ATA_VALID_MODE)
				mode = cts.xport_specific.ata.mode;
		} else {
			if (cts.xport_specific.ata.valid & CTS_SATA_VALID_MODE)
				mode = cts.xport_specific.sata.mode;
		}
		/* If SIM disagree - renegotiate. */
		if (mode != wantmode)
			goto negotiate;
		cam_fill_ataio(ataio,
		      1,
		      probedone,
		      /*flags*/CAM_DIR_NONE,
		      0,
		      /*data_ptr*/NULL,
		      /*dxfer_len*/0,
		      30 * 1000);
		ata_28bit_cmd(ataio, ATA_SETFEATURES, ATA_SF_SETXFER, 0, mode);
		break;
	}
	case PROBE_SET_MULTI:
	{
		u_int sectors;

		sectors = max(1, min(ident_buf->sectors_intr & 0xff, 16));

		/* Report bytecount to SIM. */
		bzero(&cts, sizeof(cts));
		xpt_setup_ccb(&cts.ccb_h, path, CAM_PRIORITY_NORMAL);
		cts.ccb_h.func_code = XPT_SET_TRAN_SETTINGS;
		cts.type = CTS_TYPE_CURRENT_SETTINGS;
		if (path->device->transport == XPORT_ATA) {
			cts.xport_specific.ata.bytecount = sectors *
			    ata_logical_sector_size(ident_buf);
			cts.xport_specific.ata.valid = CTS_ATA_VALID_BYTECOUNT;
		} else {
			cts.xport_specific.sata.bytecount = sectors *
			    ata_logical_sector_size(ident_buf);
			cts.xport_specific.sata.valid = CTS_SATA_VALID_BYTECOUNT;
		}
		xpt_action((union ccb *)&cts);

		cam_fill_ataio(ataio,
		    1,
		    probedone,
		    CAM_DIR_NONE,
		    0,
		    NULL,
		    0,
		    30*1000);
		ata_28bit_cmd(ataio, ATA_SET_MULTI, 0, 0, sectors);
		break;
	}
	case PROBE_INQUIRY:
	case PROBE_FULL_INQUIRY:
	{
		u_int inquiry_len;
		struct scsi_inquiry_data *inq_buf =
		    &periph->path->device->inq_data;

		if (softc->action == PROBE_INQUIRY)
			inquiry_len = SHORT_INQUIRY_LENGTH;
		else
			inquiry_len = SID_ADDITIONAL_LENGTH(inq_buf);
		/*
		 * Some parallel SCSI devices fail to send an
		 * ignore wide residue message when dealing with
		 * odd length inquiry requests.  Round up to be
		 * safe.
		 */
		inquiry_len = roundup2(inquiry_len, 2);
		scsi_inquiry(csio,
			     /*retries*/1,
			     probedone,
			     MSG_SIMPLE_Q_TAG,
			     (u_int8_t *)inq_buf,
			     inquiry_len,
			     /*evpd*/FALSE,
			     /*page_code*/0,
			     SSD_MIN_SIZE,
			     /*timeout*/60 * 1000);
		break;
	}
	case PROBE_PM_PID:
		cam_fill_ataio(ataio,
		      1,
		      probedone,
		      /*flags*/CAM_DIR_NONE,
		      0,
		      /*data_ptr*/NULL,
		      /*dxfer_len*/0,
		      10 * 1000);
		ata_pm_read_cmd(ataio, 0, 15);
		break;
	case PROBE_PM_PRV:
		cam_fill_ataio(ataio,
		      1,
		      probedone,
		      /*flags*/CAM_DIR_NONE,
		      0,
		      /*data_ptr*/NULL,
		      /*dxfer_len*/0,
		      10 * 1000);
		ata_pm_read_cmd(ataio, 1, 15);
		break;
	case PROBE_INVALID:
		CAM_DEBUG(path, CAM_DEBUG_INFO,
		    ("probestart: invalid action state\n"));
	default:
		break;
	}
	xpt_action(start_ccb);
}
#if 0
static void
proberequestdefaultnegotiation(struct cam_periph *periph)
{
	struct ccb_trans_settings cts;

	xpt_setup_ccb(&cts.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
	cts.ccb_h.func_code = XPT_GET_TRAN_SETTINGS;
	cts.type = CTS_TYPE_USER_SETTINGS;
	xpt_action((union ccb *)&cts);
	if ((cts.ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
		return;
	}
	cts.ccb_h.func_code = XPT_SET_TRAN_SETTINGS;
	cts.type = CTS_TYPE_CURRENT_SETTINGS;
	xpt_action((union ccb *)&cts);
}

/*
 * Backoff Negotiation Code- only pertinent for SPI devices.
 */
static int
proberequestbackoff(struct cam_periph *periph, struct cam_ed *device)
{
	struct ccb_trans_settings cts;
	struct ccb_trans_settings_spi *spi;

	memset(&cts, 0, sizeof (cts));
	xpt_setup_ccb(&cts.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
	cts.ccb_h.func_code = XPT_GET_TRAN_SETTINGS;
	cts.type = CTS_TYPE_CURRENT_SETTINGS;
	xpt_action((union ccb *)&cts);
	if ((cts.ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
		if (bootverbose) {
			xpt_print(periph->path,
			    "failed to get current device settings\n");
		}
		return (0);
	}
	if (cts.transport != XPORT_SPI) {
		if (bootverbose) {
			xpt_print(periph->path, "not SPI transport\n");
		}
		return (0);
	}
	spi = &cts.xport_specific.spi;

	/*
	 * We cannot renegotiate sync rate if we don't have one.
	 */
	if ((spi->valid & CTS_SPI_VALID_SYNC_RATE) == 0) {
		if (bootverbose) {
			xpt_print(periph->path, "no sync rate known\n");
		}
		return (0);
	}

	/*
	 * We'll assert that we don't have to touch PPR options- the
	 * SIM will see what we do with period and offset and adjust
	 * the PPR options as appropriate.
	 */

	/*
	 * A sync rate with unknown or zero offset is nonsensical.
	 * A sync period of zero means Async.
	 */
	if ((spi->valid & CTS_SPI_VALID_SYNC_OFFSET) == 0
	 || spi->sync_offset == 0 || spi->sync_period == 0) {
		if (bootverbose) {
			xpt_print(periph->path, "no sync rate available\n");
		}
		return (0);
	}

	if (device->flags & CAM_DEV_DV_HIT_BOTTOM) {
		CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
		    ("hit async: giving up on DV\n"));
		return (0);
	}


	/*
	 * Jump sync_period up by one, but stop at 5MHz and fall back to Async.
	 * We don't try to remember 'last' settings to see if the SIM actually
	 * gets into the speed we want to set. We check on the SIM telling
	 * us that a requested speed is bad, but otherwise don't try and
	 * check the speed due to the asynchronous and handshake nature
	 * of speed setting.
	 */
	spi->valid = CTS_SPI_VALID_SYNC_RATE | CTS_SPI_VALID_SYNC_OFFSET;
	for (;;) {
		spi->sync_period++;
		if (spi->sync_period >= 0xf) {
			spi->sync_period = 0;
			spi->sync_offset = 0;
			CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
			    ("setting to async for DV\n"));
			/*
			 * Once we hit async, we don't want to try
			 * any more settings.
			 */
			device->flags |= CAM_DEV_DV_HIT_BOTTOM;
		} else if (bootverbose) {
			CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
			    ("DV: period 0x%x\n", spi->sync_period));
			printf("setting period to 0x%x\n", spi->sync_period);
		}
		cts.ccb_h.func_code = XPT_SET_TRAN_SETTINGS;
		cts.type = CTS_TYPE_CURRENT_SETTINGS;
		xpt_action((union ccb *)&cts);
		if ((cts.ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP) {
			break;
		}
		CAM_DEBUG(periph->path, CAM_DEBUG_INFO,
		    ("DV: failed to set period 0x%x\n", spi->sync_period));
		if (spi->sync_period == 0) {
			return (0);
		}
	}
	return (1);
}
#endif
static void
probedone(struct cam_periph *periph, union ccb *done_ccb)
{
	struct ccb_trans_settings cts;
	struct ata_params *ident_buf;
	probe_softc *softc;
	struct cam_path *path;
	u_int32_t  priority;
	int found = 1;

	CAM_DEBUG(done_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("probedone\n"));

	softc = (probe_softc *)periph->softc;
	path = done_ccb->ccb_h.path;
	priority = done_ccb->ccb_h.pinfo.priority;
	ident_buf = &path->device->ident_data;

	if ((done_ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
device_fail:	if (cam_periph_error(done_ccb, 0, 0,
		    &softc->saved_ccb) == ERESTART) {
			return;
		} else if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) {
			/* Don't wedge the queue */
			xpt_release_devq(done_ccb->ccb_h.path, /*count*/1,
					 /*run_queue*/TRUE);
		}
		/* Old PIO2 devices may not support mode setting. */
		if (softc->action == PROBE_SETMODE &&
		    ata_max_pmode(ident_buf) <= ATA_PIO2 &&
		    (ident_buf->capabilities1 & ATA_SUPPORT_IORDY) == 0)
			goto noerror;
		/*
		 * If we get to this point, we got an error status back
		 * from the inquiry and the error status doesn't require
		 * automatically retrying the command.  Therefore, the
		 * inquiry failed.  If we had inquiry information before
		 * for this device, but this latest inquiry command failed,
		 * the device has probably gone away.  If this device isn't
		 * already marked unconfigured, notify the peripheral
		 * drivers that this device is no more.
		 */
		if ((path->device->flags & CAM_DEV_UNCONFIGURED) == 0)
			xpt_async(AC_LOST_DEVICE, path, NULL);
		found = 0;
		goto done;
	}
noerror:
	switch (softc->action) {
	case PROBE_RESET:
	{
		int sign = (done_ccb->ataio.res.lba_high << 8) +
		    done_ccb->ataio.res.lba_mid;
		xpt_print(path, "SIGNATURE: %04x\n", sign);
		if (sign == 0x0000 &&
		    done_ccb->ccb_h.target_id != 15) {
			path->device->protocol = PROTO_ATA;
			PROBE_SET_ACTION(softc, PROBE_IDENTIFY);
		} else if (sign == 0x9669 &&
		    done_ccb->ccb_h.target_id == 15) {
			/* Report SIM that PM is present. */
			bzero(&cts, sizeof(cts));
			xpt_setup_ccb(&cts.ccb_h, path, CAM_PRIORITY_NORMAL);
			cts.ccb_h.func_code = XPT_SET_TRAN_SETTINGS;
			cts.type = CTS_TYPE_CURRENT_SETTINGS;
			cts.xport_specific.sata.pm_present = 1;
			cts.xport_specific.sata.valid = CTS_SATA_VALID_PM;
			xpt_action((union ccb *)&cts);
			path->device->protocol = PROTO_SATAPM;
			PROBE_SET_ACTION(softc, PROBE_PM_PID);
		} else if (sign == 0xeb14 &&
		    done_ccb->ccb_h.target_id != 15) {
			path->device->protocol = PROTO_SCSI;
			PROBE_SET_ACTION(softc, PROBE_IDENTIFY);
		} else {
			if (done_ccb->ccb_h.target_id != 15) {
				xpt_print(path,
				    "Unexpected signature 0x%04x\n", sign);
			}
			goto device_fail;
		}
		xpt_release_ccb(done_ccb);
		xpt_schedule(periph, priority);
		return;
	}
	case PROBE_IDENTIFY:
	{
		int16_t *ptr;

		for (ptr = (int16_t *)ident_buf;
		     ptr < (int16_t *)ident_buf + sizeof(struct ata_params)/2; ptr++) {
			*ptr = le16toh(*ptr);
		}
		if (strncmp(ident_buf->model, "FX", 2) &&
		    strncmp(ident_buf->model, "NEC", 3) &&
		    strncmp(ident_buf->model, "Pioneer", 7) &&
		    strncmp(ident_buf->model, "SHARP", 5)) {
			ata_bswap(ident_buf->model, sizeof(ident_buf->model));
			ata_bswap(ident_buf->revision, sizeof(ident_buf->revision));
			ata_bswap(ident_buf->serial, sizeof(ident_buf->serial));
		}
		ata_btrim(ident_buf->model, sizeof(ident_buf->model));
		ata_bpack(ident_buf->model, ident_buf->model, sizeof(ident_buf->model));
		ata_btrim(ident_buf->revision, sizeof(ident_buf->revision));
		ata_bpack(ident_buf->revision, ident_buf->revision, sizeof(ident_buf->revision));
		ata_btrim(ident_buf->serial, sizeof(ident_buf->serial));
		ata_bpack(ident_buf->serial, ident_buf->serial, sizeof(ident_buf->serial));

		if ((periph->path->device->flags & CAM_DEV_UNCONFIGURED) == 0) {
			/* Check that it is the same device. */
			MD5_CTX context;
			u_int8_t digest[16];

			MD5Init(&context);
			MD5Update(&context,
			    (unsigned char *)ident_buf->model,
			    sizeof(ident_buf->model));
			MD5Update(&context,
			    (unsigned char *)ident_buf->revision,
			    sizeof(ident_buf->revision));
			MD5Update(&context,
			    (unsigned char *)ident_buf->serial,
			    sizeof(ident_buf->serial));
			MD5Final(digest, &context);
			if (bcmp(digest, softc->digest, sizeof(digest))) {
				/* Device changed. */
				xpt_async(AC_LOST_DEVICE, path, NULL);
			}
		} else {
			/* Clean up from previous instance of this device */
			if (path->device->serial_num != NULL) {
				free(path->device->serial_num, M_CAMXPT);
				path->device->serial_num = NULL;
				path->device->serial_num_len = 0;
			}
			path->device->serial_num =
				(u_int8_t *)malloc((sizeof(ident_buf->serial) + 1),
					   M_CAMXPT, M_NOWAIT);
			if (path->device->serial_num != NULL) {
				bcopy(ident_buf->serial,
				      path->device->serial_num,
				      sizeof(ident_buf->serial));
				path->device->serial_num[sizeof(ident_buf->serial)]
				    = '\0';
				path->device->serial_num_len =
				    strlen(path->device->serial_num);
			}

			path->device->flags |= CAM_DEV_IDENTIFY_DATA_VALID;
		}
		if (ident_buf->satacapabilities & ATA_SUPPORT_NCQ) {
			path->device->mintags = path->device->maxtags =
			    ATA_QUEUE_LEN(ident_buf->queue) + 1;
		}
		ata_find_quirk(path->device);
		if (path->device->mintags != 0 &&
		    path->bus->sim->max_tagged_dev_openings != 0) {
			/* Report SIM which tags are allowed. */
			bzero(&cts, sizeof(cts));
			xpt_setup_ccb(&cts.ccb_h, path, CAM_PRIORITY_NORMAL);
			cts.ccb_h.func_code = XPT_SET_TRAN_SETTINGS;
			cts.type = CTS_TYPE_CURRENT_SETTINGS;
			cts.xport_specific.sata.tags = path->device->maxtags;
			cts.xport_specific.sata.valid = CTS_SATA_VALID_TAGS;
			xpt_action((union ccb *)&cts);
			/* Reconfigure queues for tagged queueing. */
			xpt_start_tags(path);
		}
		ata_device_transport(path);
		PROBE_SET_ACTION(softc, PROBE_SETMODE);
		xpt_release_ccb(done_ccb);
		xpt_schedule(periph, priority);
		return;
	}
	case PROBE_SETMODE:
		if (path->device->protocol == PROTO_ATA) {
			PROBE_SET_ACTION(softc, PROBE_SET_MULTI);
		} else {
			PROBE_SET_ACTION(softc, PROBE_INQUIRY);
		}
		xpt_release_ccb(done_ccb);
		xpt_schedule(periph, priority);
		return;
	case PROBE_SET_MULTI:
		if (periph->path->device->flags & CAM_DEV_UNCONFIGURED) {
			path->device->flags &= ~CAM_DEV_UNCONFIGURED;
			xpt_acquire_device(path->device);
			done_ccb->ccb_h.func_code = XPT_GDEV_TYPE;
			xpt_action(done_ccb);
			xpt_async(AC_FOUND_DEVICE, done_ccb->ccb_h.path,
			    done_ccb);
		}
		break;
	case PROBE_INQUIRY:
	case PROBE_FULL_INQUIRY:
	{
		struct scsi_inquiry_data *inq_buf;
		u_int8_t periph_qual, len;

		path->device->flags |= CAM_DEV_INQUIRY_DATA_VALID;
		inq_buf = &path->device->inq_data;

		periph_qual = SID_QUAL(inq_buf);

		if (periph_qual != SID_QUAL_LU_CONNECTED)
			break;

		/*
		 * We conservatively request only
		 * SHORT_INQUIRY_LEN bytes of inquiry
		 * information during our first try
		 * at sending an INQUIRY. If the device
		 * has more information to give,
		 * perform a second request specifying
		 * the amount of information the device
		 * is willing to give.
		 */
		len = inq_buf->additional_length
		    + offsetof(struct scsi_inquiry_data, additional_length) + 1;
		if (softc->action == PROBE_INQUIRY
		    && len > SHORT_INQUIRY_LENGTH) {
			PROBE_SET_ACTION(softc, PROBE_FULL_INQUIRY);
			xpt_release_ccb(done_ccb);
			xpt_schedule(periph, priority);
			return;
		}

		ata_device_transport(path);
		if (periph->path->device->flags & CAM_DEV_UNCONFIGURED) {
			path->device->flags &= ~CAM_DEV_UNCONFIGURED;
			xpt_acquire_device(path->device);
			done_ccb->ccb_h.func_code = XPT_GDEV_TYPE;
			xpt_action(done_ccb);
			xpt_async(AC_FOUND_DEVICE, done_ccb->ccb_h.path, done_ccb);
		}
		break;
	}
	case PROBE_PM_PID:
		if ((path->device->flags & CAM_DEV_IDENTIFY_DATA_VALID) == 0)
			bzero(ident_buf, sizeof(*ident_buf));
		softc->pm_pid = (done_ccb->ataio.res.lba_high << 24) +
		    (done_ccb->ataio.res.lba_mid << 16) +
		    (done_ccb->ataio.res.lba_low << 8) +
		    done_ccb->ataio.res.sector_count;
		((uint32_t *)ident_buf)[0] = softc->pm_pid;
		printf("PM Product ID: %08x\n", softc->pm_pid);
		snprintf(ident_buf->model, sizeof(ident_buf->model),
		    "Port Multiplier %08x", softc->pm_pid);
		PROBE_SET_ACTION(softc, PROBE_PM_PRV);
		xpt_release_ccb(done_ccb);
		xpt_schedule(periph, priority);
		return;
	case PROBE_PM_PRV:
		softc->pm_prv = (done_ccb->ataio.res.lba_high << 24) +
		    (done_ccb->ataio.res.lba_mid << 16) +
		    (done_ccb->ataio.res.lba_low << 8) +
		    done_ccb->ataio.res.sector_count;
		((uint32_t *)ident_buf)[1] = softc->pm_prv;
		printf("PM Revision: %08x\n", softc->pm_prv);
		snprintf(ident_buf->revision, sizeof(ident_buf->revision),
		    "%04x", softc->pm_prv);
		path->device->flags |= CAM_DEV_IDENTIFY_DATA_VALID;
		if (periph->path->device->flags & CAM_DEV_UNCONFIGURED) {
			path->device->flags &= ~CAM_DEV_UNCONFIGURED;
			xpt_acquire_device(path->device);
			done_ccb->ccb_h.func_code = XPT_GDEV_TYPE;
			xpt_action(done_ccb);
			xpt_async(AC_FOUND_DEVICE, done_ccb->ccb_h.path,
			    done_ccb);
		} else {
			done_ccb->ccb_h.func_code = XPT_GDEV_TYPE;
			xpt_action(done_ccb);
			xpt_async(AC_SCSI_AEN, done_ccb->ccb_h.path, done_ccb);
		}
		break;
	case PROBE_INVALID:
		CAM_DEBUG(done_ccb->ccb_h.path, CAM_DEBUG_INFO,
		    ("probedone: invalid action state\n"));
	default:
		break;
	}
done:
	xpt_release_ccb(done_ccb);
	done_ccb = (union ccb *)TAILQ_FIRST(&softc->request_ccbs);
	TAILQ_REMOVE(&softc->request_ccbs, &done_ccb->ccb_h, periph_links.tqe);
	done_ccb->ccb_h.status = CAM_REQ_CMP;
	done_ccb->ccb_h.ppriv_field1 = found;
	xpt_done(done_ccb);
	if (TAILQ_FIRST(&softc->request_ccbs) == NULL) {
		cam_periph_invalidate(periph);
		cam_periph_release_locked(periph);
	} else {
		probeschedule(periph);
	}
}

static void
probecleanup(struct cam_periph *periph)
{
	free(periph->softc, M_CAMXPT);
}

static void
ata_find_quirk(struct cam_ed *device)
{
	struct ata_quirk_entry *quirk;
	caddr_t	match;

	match = cam_quirkmatch((caddr_t)&device->ident_data,
			       (caddr_t)ata_quirk_table,
			       ata_quirk_table_size,
			       sizeof(*ata_quirk_table), ata_identify_match);

	if (match == NULL)
		panic("xpt_find_quirk: device didn't match wildcard entry!!");

	quirk = (struct ata_quirk_entry *)match;
	device->quirk = quirk;
	if (quirk->quirks & CAM_QUIRK_MAXTAGS)
		device->mintags = device->maxtags = quirk->maxtags;
}

typedef struct {
	union	ccb *request_ccb;
	struct 	ccb_pathinq *cpi;
	int	counter;
	int	found;
} ata_scan_bus_info;

/*
 * To start a scan, request_ccb is an XPT_SCAN_BUS ccb.
 * As the scan progresses, xpt_scan_bus is used as the
 * callback on completion function.
 */
static void
ata_scan_bus(struct cam_periph *periph, union ccb *request_ccb)
{
	struct	cam_path *path;
	ata_scan_bus_info *scan_info;
	union	ccb *work_ccb;
	cam_status status;

	CAM_DEBUG(request_ccb->ccb_h.path, CAM_DEBUG_TRACE,
		  ("xpt_scan_bus\n"));
	switch (request_ccb->ccb_h.func_code) {
	case XPT_SCAN_BUS:
		/* Find out the characteristics of the bus */
		work_ccb = xpt_alloc_ccb_nowait();
		if (work_ccb == NULL) {
			request_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
			xpt_done(request_ccb);
			return;
		}
		xpt_setup_ccb(&work_ccb->ccb_h, request_ccb->ccb_h.path,
			      request_ccb->ccb_h.pinfo.priority);
		work_ccb->ccb_h.func_code = XPT_PATH_INQ;
		xpt_action(work_ccb);
		if (work_ccb->ccb_h.status != CAM_REQ_CMP) {
			request_ccb->ccb_h.status = work_ccb->ccb_h.status;
			xpt_free_ccb(work_ccb);
			xpt_done(request_ccb);
			return;
		}

		/* Save some state for use while we probe for devices */
		scan_info = (ata_scan_bus_info *)
		    malloc(sizeof(ata_scan_bus_info), M_CAMXPT, M_NOWAIT);
		if (scan_info == NULL) {
			request_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
			xpt_done(request_ccb);
			return;
		}
		scan_info->request_ccb = request_ccb;
		scan_info->cpi = &work_ccb->cpi;
		if (scan_info->cpi->transport == XPORT_ATA)
			scan_info->found = 0x0003;
		else
			scan_info->found = 0x8001;
		scan_info->counter = 0;
		/* If PM supported, probe it first. */
		if (scan_info->cpi->hba_inquiry & PI_SATAPM)
			scan_info->counter = 15;

		work_ccb = xpt_alloc_ccb_nowait();
		if (work_ccb == NULL) {
			free(scan_info, M_CAMXPT);
			request_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
			xpt_done(request_ccb);
			break;
		}
		goto scan_next;
	case XPT_SCAN_LUN:
		work_ccb = request_ccb;
		/* Reuse the same CCB to query if a device was really found */
		scan_info = (ata_scan_bus_info *)work_ccb->ccb_h.ppriv_ptr0;
		/* Free the current request path- we're done with it. */
		xpt_free_path(work_ccb->ccb_h.path);
		/* If there is PMP... */
		if (scan_info->counter == 15) {
			if (work_ccb->ccb_h.ppriv_field1 != 0) {
				/* everything else willbe probed by it */
				scan_info->found = 0x8000;
			} else {
				struct ccb_trans_settings cts;

				/* Report SIM that PM is absent. */
				bzero(&cts, sizeof(cts));
				xpt_setup_ccb(&cts.ccb_h,
				    scan_info->request_ccb->ccb_h.path, 1);
				cts.ccb_h.func_code = XPT_SET_TRAN_SETTINGS;
				cts.type = CTS_TYPE_CURRENT_SETTINGS;
				cts.xport_specific.sata.pm_present = 0;
				cts.xport_specific.sata.valid = CTS_SATA_VALID_PM;
				xpt_action((union ccb *)&cts);
			}
		}
take_next:
		/* Take next device. Wrap from 15 (PM) to 0. */
		scan_info->counter = (scan_info->counter + 1 ) & 0x0f;
		if (scan_info->counter > scan_info->cpi->max_target -
		    ((scan_info->cpi->hba_inquiry & PI_SATAPM) ? 1 : 0)) {
			xpt_free_ccb(work_ccb);
			xpt_free_ccb((union ccb *)scan_info->cpi);
			request_ccb = scan_info->request_ccb;
			free(scan_info, M_CAMXPT);
			request_ccb->ccb_h.status = CAM_REQ_CMP;
			xpt_done(request_ccb);
			break;
		}
scan_next:
		if ((scan_info->found & (1 << scan_info->counter)) == 0)
			goto take_next;
		status = xpt_create_path(&path, xpt_periph,
		    scan_info->request_ccb->ccb_h.path_id,
		    scan_info->counter, 0);
		if (status != CAM_REQ_CMP) {
			printf("xpt_scan_bus: xpt_create_path failed"
			    " with status %#x, bus scan halted\n",
			    status);
			xpt_free_ccb(work_ccb);
			xpt_free_ccb((union ccb *)scan_info->cpi);
			request_ccb = scan_info->request_ccb;
			free(scan_info, M_CAMXPT);
			request_ccb->ccb_h.status = status;
			xpt_done(request_ccb);
			break;
		}
		xpt_setup_ccb(&work_ccb->ccb_h, path,
		    scan_info->request_ccb->ccb_h.pinfo.priority);
		work_ccb->ccb_h.func_code = XPT_SCAN_LUN;
		work_ccb->ccb_h.cbfcnp = ata_scan_bus;
		work_ccb->ccb_h.ppriv_ptr0 = scan_info;
		work_ccb->crcn.flags = scan_info->request_ccb->crcn.flags;
		xpt_action(work_ccb);
		break;
	default:
		break;
	}
}

static void
ata_scan_lun(struct cam_periph *periph, struct cam_path *path,
	     cam_flags flags, union ccb *request_ccb)
{
	struct ccb_pathinq cpi;
	cam_status status;
	struct cam_path *new_path;
	struct cam_periph *old_periph;

	CAM_DEBUG(request_ccb->ccb_h.path, CAM_DEBUG_TRACE,
		  ("xpt_scan_lun\n"));

	xpt_setup_ccb(&cpi.ccb_h, path, CAM_PRIORITY_NORMAL);
	cpi.ccb_h.func_code = XPT_PATH_INQ;
	xpt_action((union ccb *)&cpi);

	if (cpi.ccb_h.status != CAM_REQ_CMP) {
		if (request_ccb != NULL) {
			request_ccb->ccb_h.status = cpi.ccb_h.status;
			xpt_done(request_ccb);
		}
		return;
	}

	if (request_ccb == NULL) {
		request_ccb = malloc(sizeof(union ccb), M_CAMXPT, M_NOWAIT);
		if (request_ccb == NULL) {
			xpt_print(path, "xpt_scan_lun: can't allocate CCB, "
			    "can't continue\n");
			return;
		}
		new_path = malloc(sizeof(*new_path), M_CAMXPT, M_NOWAIT);
		if (new_path == NULL) {
			xpt_print(path, "xpt_scan_lun: can't allocate path, "
			    "can't continue\n");
			free(request_ccb, M_CAMXPT);
			return;
		}
		status = xpt_compile_path(new_path, xpt_periph,
					  path->bus->path_id,
					  path->target->target_id,
					  path->device->lun_id);

		if (status != CAM_REQ_CMP) {
			xpt_print(path, "xpt_scan_lun: can't compile path, "
			    "can't continue\n");
			free(request_ccb, M_CAMXPT);
			free(new_path, M_CAMXPT);
			return;
		}
		xpt_setup_ccb(&request_ccb->ccb_h, new_path, CAM_PRIORITY_NORMAL);
		request_ccb->ccb_h.cbfcnp = xptscandone;
		request_ccb->ccb_h.func_code = XPT_SCAN_LUN;
		request_ccb->crcn.flags = flags;
	}

	if ((old_periph = cam_periph_find(path, "aprobe")) != NULL) {
		probe_softc *softc;

		softc = (probe_softc *)old_periph->softc;
		TAILQ_INSERT_TAIL(&softc->request_ccbs, &request_ccb->ccb_h,
				  periph_links.tqe);
	} else {
		status = cam_periph_alloc(proberegister, NULL, probecleanup,
					  probestart, "aprobe",
					  CAM_PERIPH_BIO,
					  request_ccb->ccb_h.path, NULL, 0,
					  request_ccb);

		if (status != CAM_REQ_CMP) {
			xpt_print(path, "xpt_scan_lun: cam_alloc_periph "
			    "returned an error, can't continue probe\n");
			request_ccb->ccb_h.status = status;
			xpt_done(request_ccb);
		}
	}
}

static void
xptscandone(struct cam_periph *periph, union ccb *done_ccb)
{
	xpt_release_path(done_ccb->ccb_h.path);
	free(done_ccb->ccb_h.path, M_CAMXPT);
	free(done_ccb, M_CAMXPT);
}

static struct cam_ed *
ata_alloc_device(struct cam_eb *bus, struct cam_et *target, lun_id_t lun_id)
{
	struct cam_path path;
	struct ata_quirk_entry *quirk;
	struct cam_ed *device;
	struct cam_ed *cur_device;

	device = xpt_alloc_device(bus, target, lun_id);
	if (device == NULL)
		return (NULL);

	/*
	 * Take the default quirk entry until we have inquiry
	 * data and can determine a better quirk to use.
	 */
	quirk = &ata_quirk_table[ata_quirk_table_size - 1];
	device->quirk = (void *)quirk;
	device->mintags = 0;
	device->maxtags = 0;
	bzero(&device->inq_data, sizeof(device->inq_data));
	device->inq_flags = 0;
	device->queue_flags = 0;
	device->serial_num = NULL;
	device->serial_num_len = 0;

	/*
	 * XXX should be limited by number of CCBs this bus can
	 * do.
	 */
	bus->sim->max_ccbs += device->ccbq.devq_openings;
	/* Insertion sort into our target's device list */
	cur_device = TAILQ_FIRST(&target->ed_entries);
	while (cur_device != NULL && cur_device->lun_id < lun_id)
		cur_device = TAILQ_NEXT(cur_device, links);
	if (cur_device != NULL) {
		TAILQ_INSERT_BEFORE(cur_device, device, links);
	} else {
		TAILQ_INSERT_TAIL(&target->ed_entries, device, links);
	}
	target->generation++;
	if (lun_id != CAM_LUN_WILDCARD) {
		xpt_compile_path(&path,
				 NULL,
				 bus->path_id,
				 target->target_id,
				 lun_id);
		ata_device_transport(&path);
		xpt_release_path(&path);
	}

	return (device);
}

static void
ata_device_transport(struct cam_path *path)
{
	struct ccb_pathinq cpi;
	struct ccb_trans_settings cts;
	struct scsi_inquiry_data *inq_buf = NULL;
	struct ata_params *ident_buf = NULL;

	/* Get transport information from the SIM */
	xpt_setup_ccb(&cpi.ccb_h, path, CAM_PRIORITY_NORMAL);
	cpi.ccb_h.func_code = XPT_PATH_INQ;
	xpt_action((union ccb *)&cpi);

	path->device->transport = cpi.transport;
	if ((path->device->flags & CAM_DEV_INQUIRY_DATA_VALID) != 0)
		inq_buf = &path->device->inq_data;
	if ((path->device->flags & CAM_DEV_IDENTIFY_DATA_VALID) != 0)
		ident_buf = &path->device->ident_data;
	if (path->device->protocol == PROTO_ATA) {
		path->device->protocol_version = ident_buf ?
		    ata_version(ident_buf->version_major) : cpi.protocol_version;
	} else if (path->device->protocol == PROTO_SCSI) {
		path->device->protocol_version = inq_buf ?
		    SID_ANSI_REV(inq_buf) : cpi.protocol_version;
	}
	path->device->transport_version = ident_buf ?
	    ata_version(ident_buf->version_major) : cpi.transport_version;

	/* Tell the controller what we think */
	xpt_setup_ccb(&cts.ccb_h, path, CAM_PRIORITY_NORMAL);
	cts.ccb_h.func_code = XPT_SET_TRAN_SETTINGS;
	cts.type = CTS_TYPE_CURRENT_SETTINGS;
	cts.transport = path->device->transport;
	cts.transport_version = path->device->transport_version;
	cts.protocol = path->device->protocol;
	cts.protocol_version = path->device->protocol_version;
	cts.proto_specific.valid = 0;
	cts.xport_specific.valid = 0;
	xpt_action((union ccb *)&cts);
}

static void
ata_action(union ccb *start_ccb)
{

	switch (start_ccb->ccb_h.func_code) {
	case XPT_SET_TRAN_SETTINGS:
	{
		ata_set_transfer_settings(&start_ccb->cts,
					   start_ccb->ccb_h.path->device,
					   /*async_update*/FALSE);
		break;
	}
	case XPT_SCAN_BUS:
		ata_scan_bus(start_ccb->ccb_h.path->periph, start_ccb);
		break;
	case XPT_SCAN_LUN:
		ata_scan_lun(start_ccb->ccb_h.path->periph,
			      start_ccb->ccb_h.path, start_ccb->crcn.flags,
			      start_ccb);
		break;
	case XPT_GET_TRAN_SETTINGS:
	{
		struct cam_sim *sim;

		sim = start_ccb->ccb_h.path->bus->sim;
		(*(sim->sim_action))(sim, start_ccb);
		break;
	}
	default:
		xpt_action_default(start_ccb);
		break;
	}
}

static void
ata_set_transfer_settings(struct ccb_trans_settings *cts, struct cam_ed *device,
			   int async_update)
{
	struct	ccb_pathinq cpi;
	struct	ccb_trans_settings cur_cts;
	struct	ccb_trans_settings_scsi *scsi;
	struct	ccb_trans_settings_scsi *cur_scsi;
	struct	cam_sim *sim;
	struct	scsi_inquiry_data *inq_data;

	if (device == NULL) {
		cts->ccb_h.status = CAM_PATH_INVALID;
		xpt_done((union ccb *)cts);
		return;
	}

	if (cts->protocol == PROTO_UNKNOWN
	 || cts->protocol == PROTO_UNSPECIFIED) {
		cts->protocol = device->protocol;
		cts->protocol_version = device->protocol_version;
	}

	if (cts->protocol_version == PROTO_VERSION_UNKNOWN
	 || cts->protocol_version == PROTO_VERSION_UNSPECIFIED)
		cts->protocol_version = device->protocol_version;

	if (cts->protocol != device->protocol) {
		xpt_print(cts->ccb_h.path, "Uninitialized Protocol %x:%x?\n",
		       cts->protocol, device->protocol);
		cts->protocol = device->protocol;
	}

	if (cts->protocol_version > device->protocol_version) {
		if (bootverbose) {
			xpt_print(cts->ccb_h.path, "Down reving Protocol "
			    "Version from %d to %d?\n", cts->protocol_version,
			    device->protocol_version);
		}
		cts->protocol_version = device->protocol_version;
	}

	if (cts->transport == XPORT_UNKNOWN
	 || cts->transport == XPORT_UNSPECIFIED) {
		cts->transport = device->transport;
		cts->transport_version = device->transport_version;
	}

	if (cts->transport_version == XPORT_VERSION_UNKNOWN
	 || cts->transport_version == XPORT_VERSION_UNSPECIFIED)
		cts->transport_version = device->transport_version;

	if (cts->transport != device->transport) {
		xpt_print(cts->ccb_h.path, "Uninitialized Transport %x:%x?\n",
		    cts->transport, device->transport);
		cts->transport = device->transport;
	}

	if (cts->transport_version > device->transport_version) {
		if (bootverbose) {
			xpt_print(cts->ccb_h.path, "Down reving Transport "
			    "Version from %d to %d?\n", cts->transport_version,
			    device->transport_version);
		}
		cts->transport_version = device->transport_version;
	}

	sim = cts->ccb_h.path->bus->sim;

	/*
	 * Nothing more of interest to do unless
	 * this is a device connected via the
	 * SCSI protocol.
	 */
	if (cts->protocol != PROTO_SCSI) {
		if (async_update == FALSE)
			(*(sim->sim_action))(sim, (union ccb *)cts);
		return;
	}

	inq_data = &device->inq_data;
	scsi = &cts->proto_specific.scsi;
	xpt_setup_ccb(&cpi.ccb_h, cts->ccb_h.path, CAM_PRIORITY_NORMAL);
	cpi.ccb_h.func_code = XPT_PATH_INQ;
	xpt_action((union ccb *)&cpi);

	/* SCSI specific sanity checking */
	if ((cpi.hba_inquiry & PI_TAG_ABLE) == 0
	 || (INQ_DATA_TQ_ENABLED(inq_data)) == 0
	 || (device->queue_flags & SCP_QUEUE_DQUE) != 0
	 || (device->mintags == 0)) {
		/*
		 * Can't tag on hardware that doesn't support tags,
		 * doesn't have it enabled, or has broken tag support.
		 */
		scsi->flags &= ~CTS_SCSI_FLAGS_TAG_ENB;
	}

	if (async_update == FALSE) {
		/*
		 * Perform sanity checking against what the
		 * controller and device can do.
		 */
		xpt_setup_ccb(&cur_cts.ccb_h, cts->ccb_h.path, CAM_PRIORITY_NORMAL);
		cur_cts.ccb_h.func_code = XPT_GET_TRAN_SETTINGS;
		cur_cts.type = cts->type;
		xpt_action((union ccb *)&cur_cts);
		if ((cur_cts.ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
			return;
		}
		cur_scsi = &cur_cts.proto_specific.scsi;
		if ((scsi->valid & CTS_SCSI_VALID_TQ) == 0) {
			scsi->flags &= ~CTS_SCSI_FLAGS_TAG_ENB;
			scsi->flags |= cur_scsi->flags & CTS_SCSI_FLAGS_TAG_ENB;
		}
		if ((cur_scsi->valid & CTS_SCSI_VALID_TQ) == 0)
			scsi->flags &= ~CTS_SCSI_FLAGS_TAG_ENB;
	}

	if (cts->type == CTS_TYPE_CURRENT_SETTINGS
	 && (scsi->valid & CTS_SCSI_VALID_TQ) != 0) {
		int device_tagenb;

		/*
		 * If we are transitioning from tags to no-tags or
		 * vice-versa, we need to carefully freeze and restart
		 * the queue so that we don't overlap tagged and non-tagged
		 * commands.  We also temporarily stop tags if there is
		 * a change in transfer negotiation settings to allow
		 * "tag-less" negotiation.
		 */
		if ((device->flags & CAM_DEV_TAG_AFTER_COUNT) != 0
		 || (device->inq_flags & SID_CmdQue) != 0)
			device_tagenb = TRUE;
		else
			device_tagenb = FALSE;

		if (((scsi->flags & CTS_SCSI_FLAGS_TAG_ENB) != 0
		  && device_tagenb == FALSE)
		 || ((scsi->flags & CTS_SCSI_FLAGS_TAG_ENB) == 0
		  && device_tagenb == TRUE)) {

			if ((scsi->flags & CTS_SCSI_FLAGS_TAG_ENB) != 0) {
				/*
				 * Delay change to use tags until after a
				 * few commands have gone to this device so
				 * the controller has time to perform transfer
				 * negotiations without tagged messages getting
				 * in the way.
				 */
				device->tag_delay_count = CAM_TAG_DELAY_COUNT;
				device->flags |= CAM_DEV_TAG_AFTER_COUNT;
			} else {
				xpt_stop_tags(cts->ccb_h.path);
			}
		}
	}
	if (async_update == FALSE)
		(*(sim->sim_action))(sim, (union ccb *)cts);
}

/*
 * Handle any per-device event notifications that require action by the XPT.
 */
static void
ata_dev_async(u_int32_t async_code, struct cam_eb *bus, struct cam_et *target,
	      struct cam_ed *device, void *async_arg)
{
	cam_status status;
	struct cam_path newpath;

	/*
	 * We only need to handle events for real devices.
	 */
	if (target->target_id == CAM_TARGET_WILDCARD
	 || device->lun_id == CAM_LUN_WILDCARD)
		return;

	/*
	 * We need our own path with wildcards expanded to
	 * handle certain types of events.
	 */
	if ((async_code == AC_SENT_BDR)
	 || (async_code == AC_BUS_RESET)
	 || (async_code == AC_INQ_CHANGED))
		status = xpt_compile_path(&newpath, NULL,
					  bus->path_id,
					  target->target_id,
					  device->lun_id);
	else
		status = CAM_REQ_CMP_ERR;

	if (status == CAM_REQ_CMP) {
		if (async_code == AC_INQ_CHANGED) {
			/*
			 * We've sent a start unit command, or
			 * something similar to a device that
			 * may have caused its inquiry data to
			 * change. So we re-scan the device to
			 * refresh the inquiry data for it.
			 */
			ata_scan_lun(newpath.periph, &newpath,
				     CAM_EXPECT_INQ_CHANGE, NULL);
		}
		xpt_release_path(&newpath);
	} else if (async_code == AC_LOST_DEVICE &&
	    (device->flags & CAM_DEV_UNCONFIGURED) == 0) {
		device->flags |= CAM_DEV_UNCONFIGURED;
		xpt_release_device(device);
	} else if (async_code == AC_TRANSFER_NEG) {
		struct ccb_trans_settings *settings;

		settings = (struct ccb_trans_settings *)async_arg;
		ata_set_transfer_settings(settings, device,
					  /*async_update*/TRUE);
	}
}