freebsd-nq/sys/dev/firewire/sbp.c

/*-
 * SPDX-License-Identifier: BSD-4-Clause
 *
 * Copyright (c) 2003 Hidetoshi Shimokawa
 * Copyright (c) 1998-2002 Katsushi Kobayashi and Hidetoshi Shimokawa
 * 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.
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the acknowledgement as bellow:
 *
 *    This product includes software developed by K. Kobayashi and H. Shimokawa
 *
 * 4. 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 ``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.
 *
 * $FreeBSD$
 *
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <machine/bus.h>
#include <sys/malloc.h>
#include <sys/lock.h>
#include <sys/mutex.h>

#include <cam/cam.h>
#include <cam/cam_ccb.h>
#include <cam/cam_sim.h>
#include <cam/cam_xpt_sim.h>
#include <cam/cam_debug.h>
#include <cam/cam_periph.h>
#include <cam/scsi/scsi_all.h>

#include <dev/firewire/firewire.h>
#include <dev/firewire/firewirereg.h>
#include <dev/firewire/fwdma.h>
#include <dev/firewire/iec13213.h>
#include <dev/firewire/sbp.h>

#define ccb_sdev_ptr	spriv_ptr0
#define ccb_sbp_ptr	spriv_ptr1

#define SBP_NUM_TARGETS 8 /* MAX 64 */
/*
 * Scan_bus doesn't work for more than 8 LUNs
 * because of CAM_SCSI2_MAXLUN in cam_xpt.c
 */
#define SBP_NUM_LUNS 64
#define SBP_MAXPHYS  (128 * 1024)
#define SBP_DMA_SIZE PAGE_SIZE
#define SBP_LOGIN_SIZE sizeof(struct sbp_login_res)
#define SBP_QUEUE_LEN ((SBP_DMA_SIZE - SBP_LOGIN_SIZE) / sizeof(struct sbp_ocb))
#define SBP_NUM_OCB (SBP_QUEUE_LEN * SBP_NUM_TARGETS)

/*
 * STATUS FIFO addressing
 *   bit
 *-----------------------
 *  0- 1( 2): 0 (alignment)
 *  2- 7( 6): target
 *  8-15( 8): lun
 * 16-31( 8): reserved
 * 32-47(16): SBP_BIND_HI
 * 48-64(16): bus_id, node_id
 */
#define SBP_BIND_HI 0x1
#define SBP_DEV2ADDR(t, l) \
	(((u_int64_t)SBP_BIND_HI << 32) \
	| (((l) & 0xff) << 8) \
	| (((t) & 0x3f) << 2))
#define SBP_ADDR2TRG(a)	(((a) >> 2) & 0x3f)
#define SBP_ADDR2LUN(a)	(((a) >> 8) & 0xff)
#define SBP_INITIATOR 7

static char *orb_fun_name[] = {
	ORB_FUN_NAMES
};

static int debug = 0;
static int auto_login = 1;
static int max_speed = -1;
static int sbp_cold = 1;
static int ex_login = 1;
static int login_delay = 1000;	/* msec */
static int scan_delay = 500;	/* msec */
static int use_doorbell = 0;
static int sbp_tags = 0;

SYSCTL_DECL(_hw_firewire);
static SYSCTL_NODE(_hw_firewire, OID_AUTO, sbp, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
    "SBP-II Subsystem");
SYSCTL_INT(_debug, OID_AUTO, sbp_debug, CTLFLAG_RWTUN, &debug, 0,
	"SBP debug flag");
SYSCTL_INT(_hw_firewire_sbp, OID_AUTO, auto_login, CTLFLAG_RWTUN, &auto_login, 0,
	"SBP perform login automatically");
SYSCTL_INT(_hw_firewire_sbp, OID_AUTO, max_speed, CTLFLAG_RWTUN, &max_speed, 0,
	"SBP transfer max speed");
SYSCTL_INT(_hw_firewire_sbp, OID_AUTO, exclusive_login, CTLFLAG_RWTUN,
	&ex_login, 0, "SBP enable exclusive login");
SYSCTL_INT(_hw_firewire_sbp, OID_AUTO, login_delay, CTLFLAG_RWTUN,
	&login_delay, 0, "SBP login delay in msec");
SYSCTL_INT(_hw_firewire_sbp, OID_AUTO, scan_delay, CTLFLAG_RWTUN,
	&scan_delay, 0, "SBP scan delay in msec");
SYSCTL_INT(_hw_firewire_sbp, OID_AUTO, use_doorbell, CTLFLAG_RWTUN,
	&use_doorbell, 0, "SBP use doorbell request");
SYSCTL_INT(_hw_firewire_sbp, OID_AUTO, tags, CTLFLAG_RWTUN, &sbp_tags, 0,
	"SBP tagged queuing support");

#define NEED_RESPONSE 0

#define SBP_SEG_MAX rounddown(0xffff, PAGE_SIZE)
#define SBP_IND_MAX howmany(SBP_MAXPHYS, PAGE_SIZE)
struct sbp_ocb {
	STAILQ_ENTRY(sbp_ocb)	ocb;
	union ccb	*ccb;
	bus_addr_t	bus_addr;
	uint32_t	orb[8];
#define IND_PTR_OFFSET	(8*sizeof(uint32_t))
	struct ind_ptr  ind_ptr[SBP_IND_MAX];
	struct sbp_dev	*sdev;
	int		flags; /* XXX should be removed */
	bus_dmamap_t	dmamap;
	struct callout	timer;
};

#define OCB_ACT_MGM 0
#define OCB_ACT_CMD 1
#define OCB_MATCH(o,s)	((o)->bus_addr == ntohl((s)->orb_lo))

struct sbp_dev {
#define SBP_DEV_RESET		0	/* accept login */
#define SBP_DEV_LOGIN		1	/* to login */
#if 0
#define SBP_DEV_RECONN		2	/* to reconnect */
#endif
#define SBP_DEV_TOATTACH	3	/* to attach */
#define SBP_DEV_PROBE		4	/* scan lun */
#define SBP_DEV_ATTACHED	5	/* in operation */
#define SBP_DEV_DEAD		6	/* unavailable unit */
#define SBP_DEV_RETRY		7	/* unavailable unit */
	uint8_t status:4,
		 timeout:4;
	uint8_t type;
	uint16_t lun_id;
	uint16_t freeze;
#define	ORB_LINK_DEAD		(1 << 0)
#define	VALID_LUN		(1 << 1)
#define	ORB_POINTER_ACTIVE	(1 << 2)
#define	ORB_POINTER_NEED	(1 << 3)
#define	ORB_DOORBELL_ACTIVE	(1 << 4)
#define	ORB_DOORBELL_NEED	(1 << 5)
#define	ORB_SHORTAGE		(1 << 6)
	uint16_t flags;
	struct cam_path *path;
	struct sbp_target *target;
	struct fwdma_alloc dma;
	struct sbp_login_res *login;
	struct callout login_callout;
	struct sbp_ocb *ocb;
	STAILQ_HEAD(, sbp_ocb) ocbs;
	STAILQ_HEAD(, sbp_ocb) free_ocbs;
	struct sbp_ocb *last_ocb;
	char vendor[32];
	char product[32];
	char revision[10];
	char bustgtlun[32];
};

struct sbp_target {
	int target_id;
	int num_lun;
	struct sbp_dev	**luns;
	struct sbp_softc *sbp;
	struct fw_device *fwdev;
	uint32_t mgm_hi, mgm_lo;
	struct sbp_ocb *mgm_ocb_cur;
	STAILQ_HEAD(, sbp_ocb) mgm_ocb_queue;
	struct callout mgm_ocb_timeout;
	struct callout scan_callout;
	STAILQ_HEAD(, fw_xfer) xferlist;
	int n_xfer;
};

struct sbp_softc {
	struct firewire_dev_comm fd;
	struct cam_sim  *sim;
	struct cam_path  *path;
	struct sbp_target targets[SBP_NUM_TARGETS];
	struct fw_bind fwb;
	bus_dma_tag_t	dmat;
	struct timeval last_busreset;
#define SIMQ_FREEZED 1
	int flags;
	struct mtx mtx;
};
#define	SBP_LOCK(sbp)		mtx_lock(&(sbp)->mtx)
#define	SBP_UNLOCK(sbp)		mtx_unlock(&(sbp)->mtx)
#define	SBP_LOCK_ASSERT(sbp)	mtx_assert(&(sbp)->mtx, MA_OWNED)

static void sbp_post_explore (void *);
static void sbp_recv (struct fw_xfer *);
static void sbp_mgm_callback (struct fw_xfer *);
#if 0
static void sbp_cmd_callback (struct fw_xfer *);
#endif
static void sbp_orb_pointer (struct sbp_dev *, struct sbp_ocb *);
static void sbp_doorbell(struct sbp_dev *);
static void sbp_execute_ocb (void *, bus_dma_segment_t *, int, int);
static void sbp_free_ocb (struct sbp_dev *, struct sbp_ocb *);
static void sbp_abort_ocb (struct sbp_ocb *, int);
static void sbp_abort_all_ocbs (struct sbp_dev *, int);
static struct fw_xfer * sbp_write_cmd (struct sbp_dev *, int, int);
static struct sbp_ocb * sbp_get_ocb (struct sbp_dev *);
static struct sbp_ocb * sbp_enqueue_ocb (struct sbp_dev *, struct sbp_ocb *);
static struct sbp_ocb * sbp_dequeue_ocb (struct sbp_dev *, struct sbp_status *);
static void sbp_cam_detach_sdev(struct sbp_dev *);
static void sbp_free_sdev(struct sbp_dev *);
static void sbp_cam_detach_target (struct sbp_target *);
static void sbp_free_target (struct sbp_target *);
static void sbp_mgm_timeout (void *arg);
static void sbp_timeout (void *arg);
static void sbp_mgm_orb (struct sbp_dev *, int, struct sbp_ocb *);

static MALLOC_DEFINE(M_SBP, "sbp", "SBP-II/FireWire");

/* cam related functions */
static void	sbp_action(struct cam_sim *sim, union ccb *ccb);
static void	sbp_poll(struct cam_sim *sim);
static void	sbp_cam_scan_lun(struct cam_periph *, union ccb *);
static void	sbp_cam_scan_target(void *arg);

static char *orb_status0[] = {
	/* 0 */ "No additional information to report",
	/* 1 */ "Request type not supported",
	/* 2 */ "Speed not supported",
	/* 3 */ "Page size not supported",
	/* 4 */ "Access denied",
	/* 5 */ "Logical unit not supported",
	/* 6 */ "Maximum payload too small",
	/* 7 */ "Reserved for future standardization",
	/* 8 */ "Resources unavailable",
	/* 9 */ "Function rejected",
	/* A */ "Login ID not recognized",
	/* B */ "Dummy ORB completed",
	/* C */ "Request aborted",
	/* FF */ "Unspecified error"
#define MAX_ORB_STATUS0 0xd
};

static char *orb_status1_object[] = {
	/* 0 */ "Operation request block (ORB)",
	/* 1 */ "Data buffer",
	/* 2 */ "Page table",
	/* 3 */ "Unable to specify"
};

static char *orb_status1_serial_bus_error[] = {
	/* 0 */ "Missing acknowledge",
	/* 1 */ "Reserved; not to be used",
	/* 2 */ "Time-out error",
	/* 3 */ "Reserved; not to be used",
	/* 4 */ "Busy retry limit exceeded(X)",
	/* 5 */ "Busy retry limit exceeded(A)",
	/* 6 */ "Busy retry limit exceeded(B)",
	/* 7 */ "Reserved for future standardization",
	/* 8 */ "Reserved for future standardization",
	/* 9 */ "Reserved for future standardization",
	/* A */ "Reserved for future standardization",
	/* B */ "Tardy retry limit exceeded",
	/* C */ "Conflict error",
	/* D */ "Data error",
	/* E */ "Type error",
	/* F */ "Address error"
};

static void
sbp_identify(driver_t *driver, device_t parent)
{
SBP_DEBUG(0)
	printf("sbp_identify\n");
END_DEBUG

	if (device_find_child(parent, "sbp", -1) == NULL)
		BUS_ADD_CHILD(parent, 0, "sbp", -1);
}

/*
 * sbp_probe()
 */
static int
sbp_probe(device_t dev)
{

SBP_DEBUG(0)
	printf("sbp_probe\n");
END_DEBUG

	device_set_desc(dev, "SBP-2/SCSI over FireWire");

#if 0
	if (bootverbose)
		debug = bootverbose;
#endif

	return (0);
}

/*
 * Display device characteristics on the console
 */
static void
sbp_show_sdev_info(struct sbp_dev *sdev)
{
	struct fw_device *fwdev;

	fwdev = sdev->target->fwdev;
	device_printf(sdev->target->sbp->fd.dev,
		"%s: %s: ordered:%d type:%d EUI:%08x%08x node:%d "
		"speed:%d maxrec:%d\n",
		__func__,
		sdev->bustgtlun,
		(sdev->type & 0x40) >> 6,
		(sdev->type & 0x1f),
		fwdev->eui.hi,
		fwdev->eui.lo,
		fwdev->dst,
		fwdev->speed,
		fwdev->maxrec);

	device_printf(sdev->target->sbp->fd.dev,
			"%s: %s '%s' '%s' '%s'\n",
			__func__,
			sdev->bustgtlun,
			sdev->vendor,
			sdev->product,
			sdev->revision);
}

static struct {
	int bus;
	int target;
	struct fw_eui64 eui;
} wired[] = {
	/* Bus	Target	EUI64 */
#if 0
	{0,	2,	{0x00018ea0, 0x01fd0154}},	/* Logitec HDD */
	{0,	0,	{0x00018ea6, 0x00100682}},	/* Logitec DVD */
	{0,	1,	{0x00d03200, 0xa412006a}},	/* Yano HDD */
#endif
	{-1,	-1,	{0,0}}
};

static int
sbp_new_target(struct sbp_softc *sbp, struct fw_device *fwdev)
{
	int bus, i, target=-1;
	char w[SBP_NUM_TARGETS];

	bzero(w, sizeof(w));
	bus = device_get_unit(sbp->fd.dev);

	/* XXX wired-down configuration should be gotten from
					tunable or device hint */
	for (i = 0; wired[i].bus >= 0; i++) {
		if (wired[i].bus == bus) {
			w[wired[i].target] = 1;
			if (wired[i].eui.hi == fwdev->eui.hi &&
					wired[i].eui.lo == fwdev->eui.lo)
				target = wired[i].target;
		}
	}
	if (target >= 0) {
		if (target < SBP_NUM_TARGETS &&
				sbp->targets[target].fwdev == NULL)
			return (target);
		device_printf(sbp->fd.dev,
			"target %d is not free for %08x:%08x\n",
			target, fwdev->eui.hi, fwdev->eui.lo);
		target = -1;
	}
	/* non-wired target */
	for (i = 0; i < SBP_NUM_TARGETS; i++)
		if (sbp->targets[i].fwdev == NULL && w[i] == 0) {
			target = i;
			break;
		}

	return target;
}

static void
sbp_alloc_lun(struct sbp_target *target)
{
	struct crom_context cc;
	struct csrreg *reg;
	struct sbp_dev *sdev, **newluns;
	struct sbp_softc *sbp;
	int maxlun, lun, i;

	sbp = target->sbp;
	crom_init_context(&cc, target->fwdev->csrrom);
	/* XXX shoud parse appropriate unit directories only */
	maxlun = -1;
	while (cc.depth >= 0) {
		reg = crom_search_key(&cc, CROM_LUN);
		if (reg == NULL)
			break;
		lun = reg->val & 0xffff;
SBP_DEBUG(0)
		printf("target %d lun %d found\n", target->target_id, lun);
END_DEBUG
		if (maxlun < lun)
			maxlun = lun;
		crom_next(&cc);
	}
	if (maxlun < 0)
		device_printf(target->sbp->fd.dev, "%d no LUN found\n",
		    target->target_id);

	maxlun++;
	if (maxlun >= SBP_NUM_LUNS)
		maxlun = SBP_NUM_LUNS;

	/* Invalidiate stale devices */
	for (lun = 0; lun < target->num_lun; lun++) {
		sdev = target->luns[lun];
		if (sdev == NULL)
			continue;
		sdev->flags &= ~VALID_LUN;
		if (lun >= maxlun) {
			/* lost device */
			sbp_cam_detach_sdev(sdev);
			sbp_free_sdev(sdev);
			target->luns[lun] = NULL;
		}
	}

	/* Reallocate */
	if (maxlun != target->num_lun) {
		newluns = (struct sbp_dev **) realloc(target->luns,
		    sizeof(struct sbp_dev *) * maxlun,
		    M_SBP, M_NOWAIT | M_ZERO);

		if (newluns == NULL) {
			printf("%s: realloc failed\n", __func__);
			newluns = target->luns;
			maxlun = target->num_lun;
		}

		/*
		 * We must zero the extended region for the case
		 * realloc() doesn't allocate new buffer.
		 */
		if (maxlun > target->num_lun)
			bzero(&newluns[target->num_lun],
			    sizeof(struct sbp_dev *) *
			    (maxlun - target->num_lun));

		target->luns = newluns;
		target->num_lun = maxlun;
	}

	crom_init_context(&cc, target->fwdev->csrrom);
	while (cc.depth >= 0) {
		int new = 0;

		reg = crom_search_key(&cc, CROM_LUN);
		if (reg == NULL)
			break;
		lun = reg->val & 0xffff;
		if (lun >= SBP_NUM_LUNS) {
			printf("too large lun %d\n", lun);
			goto next;
		}

		sdev = target->luns[lun];
		if (sdev == NULL) {
			sdev = malloc(sizeof(struct sbp_dev),
			    M_SBP, M_NOWAIT | M_ZERO);
			if (sdev == NULL) {
				printf("%s: malloc failed\n", __func__);
				goto next;
			}
			target->luns[lun] = sdev;
			sdev->lun_id = lun;
			sdev->target = target;
			STAILQ_INIT(&sdev->ocbs);
			callout_init_mtx(&sdev->login_callout, &sbp->mtx, 0);
			sdev->status = SBP_DEV_RESET;
			new = 1;
			snprintf(sdev->bustgtlun, 32, "%s:%d:%d",
					device_get_nameunit(sdev->target->sbp->fd.dev),
					sdev->target->target_id,
					sdev->lun_id);
		}
		sdev->flags |= VALID_LUN;
		sdev->type = (reg->val & 0xff0000) >> 16;

		if (new == 0)
			goto next;

		fwdma_malloc(sbp->fd.fc,
			/* alignment */ sizeof(uint32_t),
			SBP_DMA_SIZE, &sdev->dma, BUS_DMA_NOWAIT |
			BUS_DMA_COHERENT);
		if (sdev->dma.v_addr == NULL) {
			printf("%s: dma space allocation failed\n",
							__func__);
			free(sdev, M_SBP);
			target->luns[lun] = NULL;
			goto next;
		}
		sdev->login = (struct sbp_login_res *) sdev->dma.v_addr;
		sdev->ocb = (struct sbp_ocb *)
				((char *)sdev->dma.v_addr + SBP_LOGIN_SIZE);
		bzero((char *)sdev->ocb,
			sizeof(struct sbp_ocb) * SBP_QUEUE_LEN);

		STAILQ_INIT(&sdev->free_ocbs);
		for (i = 0; i < SBP_QUEUE_LEN; i++) {
			struct sbp_ocb *ocb;
			ocb = &sdev->ocb[i];
			ocb->bus_addr = sdev->dma.bus_addr
				+ SBP_LOGIN_SIZE
				+ sizeof(struct sbp_ocb) * i
				+ offsetof(struct sbp_ocb, orb[0]);
			if (bus_dmamap_create(sbp->dmat, 0, &ocb->dmamap)) {
				printf("sbp_attach: cannot create dmamap\n");
				/* XXX */
				goto next;
			}
			callout_init_mtx(&ocb->timer, &sbp->mtx, 0);
			SBP_LOCK(sbp);
			sbp_free_ocb(sdev, ocb);
			SBP_UNLOCK(sbp);
		}
next:
		crom_next(&cc);
	}

	for (lun = 0; lun < target->num_lun; lun++) {
		sdev = target->luns[lun];
		if (sdev != NULL && (sdev->flags & VALID_LUN) == 0) {
			sbp_cam_detach_sdev(sdev);
			sbp_free_sdev(sdev);
			target->luns[lun] = NULL;
		}
	}
}

static struct sbp_target *
sbp_alloc_target(struct sbp_softc *sbp, struct fw_device *fwdev)
{
	int i;
	struct sbp_target *target;
	struct crom_context cc;
	struct csrreg *reg;

SBP_DEBUG(1)
	printf("sbp_alloc_target\n");
END_DEBUG
	i = sbp_new_target(sbp, fwdev);
	if (i < 0) {
		device_printf(sbp->fd.dev, "increase SBP_NUM_TARGETS!\n");
		return NULL;
	}
	/* new target */
	target = &sbp->targets[i];
	target->fwdev = fwdev;
	target->target_id = i;
	/* XXX we may want to reload mgm port after each bus reset */
	/* XXX there might be multiple management agents */
	crom_init_context(&cc, target->fwdev->csrrom);
	reg = crom_search_key(&cc, CROM_MGM);
	if (reg == NULL || reg->val == 0) {
		printf("NULL management address\n");
		target->fwdev = NULL;
		return NULL;
	}
	target->mgm_hi = 0xffff;
	target->mgm_lo = 0xf0000000 | (reg->val << 2);
	target->mgm_ocb_cur = NULL;
SBP_DEBUG(1)
	printf("target:%d mgm_port: %x\n", i, target->mgm_lo);
END_DEBUG
	STAILQ_INIT(&target->xferlist);
	target->n_xfer = 0;
	STAILQ_INIT(&target->mgm_ocb_queue);
	callout_init_mtx(&target->mgm_ocb_timeout, &sbp->mtx, 0);
	callout_init_mtx(&target->scan_callout, &sbp->mtx, 0);

	target->luns = NULL;
	target->num_lun = 0;
	return target;
}

static void
sbp_probe_lun(struct sbp_dev *sdev)
{
	struct fw_device *fwdev;
	struct crom_context c, *cc = &c;
	struct csrreg *reg;

	bzero(sdev->vendor, sizeof(sdev->vendor));
	bzero(sdev->product, sizeof(sdev->product));

	fwdev = sdev->target->fwdev;
	crom_init_context(cc, fwdev->csrrom);
	/* get vendor string */
	crom_search_key(cc, CSRKEY_VENDOR);
	crom_next(cc);
	crom_parse_text(cc, sdev->vendor, sizeof(sdev->vendor));
	/* skip to the unit directory for SBP-2 */
	while ((reg = crom_search_key(cc, CSRKEY_VER)) != NULL) {
		if (reg->val == CSRVAL_T10SBP2)
			break;
		crom_next(cc);
	}
	/* get firmware revision */
	reg = crom_search_key(cc, CSRKEY_FIRM_VER);
	if (reg != NULL)
		snprintf(sdev->revision, sizeof(sdev->revision),
						"%06x", reg->val);
	/* get product string */
	crom_search_key(cc, CSRKEY_MODEL);
	crom_next(cc);
	crom_parse_text(cc, sdev->product, sizeof(sdev->product));
}

static void
sbp_login_callout(void *arg)
{
	struct sbp_dev *sdev = (struct sbp_dev *)arg;
	SBP_LOCK_ASSERT(sdev->target->sbp);
	sbp_mgm_orb(sdev, ORB_FUN_LGI, NULL);
}

static void
sbp_login(struct sbp_dev *sdev)
{
	struct timeval delta;
	struct timeval t;
	int ticks = 0;

	microtime(&delta);
	timevalsub(&delta, &sdev->target->sbp->last_busreset);
	t.tv_sec = login_delay / 1000;
	t.tv_usec = (login_delay % 1000) * 1000;
	timevalsub(&t, &delta);
	if (t.tv_sec >= 0 && t.tv_usec > 0)
		ticks = (t.tv_sec * 1000 + t.tv_usec / 1000) * hz / 1000;
SBP_DEBUG(0)
	printf("%s: sec = %jd usec = %ld ticks = %d\n", __func__,
	    (intmax_t)t.tv_sec, t.tv_usec, ticks);
END_DEBUG
	callout_reset(&sdev->login_callout, ticks,
			sbp_login_callout, (void *)(sdev));
}

#define SBP_FWDEV_ALIVE(fwdev) (((fwdev)->status == FWDEVATTACHED) \
	&& crom_has_specver((fwdev)->csrrom, CSRVAL_ANSIT10, CSRVAL_T10SBP2))

static void
sbp_probe_target(struct sbp_target *target)
{
	struct sbp_softc *sbp = target->sbp;
	struct sbp_dev *sdev;
	int i, alive;

	alive = SBP_FWDEV_ALIVE(target->fwdev);
SBP_DEBUG(1)
	device_printf(sbp->fd.dev, "%s %d%salive\n",
		 __func__, target->target_id,
		(!alive) ? " not " : "");
END_DEBUG

	sbp_alloc_lun(target);

	/* XXX untimeout mgm_ocb and dequeue */
	for (i=0; i < target->num_lun; i++) {
		sdev = target->luns[i];
		if (sdev == NULL)
			continue;
		if (alive && (sdev->status != SBP_DEV_DEAD)) {
			if (sdev->path != NULL) {
				xpt_freeze_devq(sdev->path, 1);
				sdev->freeze++;
			}
			sbp_probe_lun(sdev);
			sbp_show_sdev_info(sdev);

			SBP_LOCK(sbp);
			sbp_abort_all_ocbs(sdev, CAM_SCSI_BUS_RESET);
			SBP_UNLOCK(sbp);
			switch (sdev->status) {
			case SBP_DEV_RESET:
				/* new or revived target */
				if (auto_login)
					sbp_login(sdev);
				break;
			case SBP_DEV_TOATTACH:
			case SBP_DEV_PROBE:
			case SBP_DEV_ATTACHED:
			case SBP_DEV_RETRY:
			default:
				sbp_mgm_orb(sdev, ORB_FUN_RCN, NULL);
				break;
			}
		} else {
			switch (sdev->status) {
			case SBP_DEV_ATTACHED:
SBP_DEBUG(0)
				/* the device has gone */
				device_printf(sbp->fd.dev, "%s: lost target\n",
					__func__);
END_DEBUG
				if (sdev->path) {
					xpt_freeze_devq(sdev->path, 1);
					sdev->freeze++;
				}
				sdev->status = SBP_DEV_RETRY;
				sbp_cam_detach_sdev(sdev);
				sbp_free_sdev(sdev);
				target->luns[i] = NULL;
				break;
			case SBP_DEV_PROBE:
			case SBP_DEV_TOATTACH:
				sdev->status = SBP_DEV_RESET;
				break;
			case SBP_DEV_RETRY:
			case SBP_DEV_RESET:
			case SBP_DEV_DEAD:
				break;
			}
		}
	}
}

static void
sbp_post_busreset(void *arg)
{
	struct sbp_softc *sbp;

	sbp = (struct sbp_softc *)arg;
SBP_DEBUG(0)
	printf("sbp_post_busreset\n");
END_DEBUG
	SBP_LOCK(sbp);
	if ((sbp->flags & SIMQ_FREEZED) == 0) {
		xpt_freeze_simq(sbp->sim, /*count*/1);
		sbp->flags |= SIMQ_FREEZED;
	}
	microtime(&sbp->last_busreset);
	SBP_UNLOCK(sbp);
}

static void
sbp_post_explore(void *arg)
{
	struct sbp_softc *sbp = (struct sbp_softc *)arg;
	struct sbp_target *target;
	struct fw_device *fwdev;
	int i, alive;

SBP_DEBUG(0)
	printf("sbp_post_explore (sbp_cold=%d)\n", sbp_cold);
END_DEBUG
	/* We need physical access */
	if (!firewire_phydma_enable)
		return;

	if (sbp_cold > 0)
		sbp_cold--;

	SBP_LOCK(sbp);

	/* Garbage Collection */
	for (i = 0; i < SBP_NUM_TARGETS; i++) {
		target = &sbp->targets[i];
		if (target->fwdev == NULL)
			continue;

		STAILQ_FOREACH(fwdev, &sbp->fd.fc->devices, link)
			if (target->fwdev == fwdev)
				break;
		if (fwdev == NULL) {
			/* device has removed in lower driver */
			sbp_cam_detach_target(target);
			sbp_free_target(target);
		}
	}

	/* traverse device list */
	STAILQ_FOREACH(fwdev, &sbp->fd.fc->devices, link) {
SBP_DEBUG(0)
		device_printf(sbp->fd.dev,"%s:: EUI:%08x%08x %s attached, state=%d\n",
				__func__, fwdev->eui.hi, fwdev->eui.lo,
				(fwdev->status != FWDEVATTACHED) ? "not" : "",
				fwdev->status);
END_DEBUG
		alive = SBP_FWDEV_ALIVE(fwdev);
		for (i = 0; i < SBP_NUM_TARGETS; i++) {
			target = &sbp->targets[i];
			if (target->fwdev == fwdev) {
				/* known target */
				break;
			}
		}
		if (i == SBP_NUM_TARGETS) {
			if (alive) {
				/* new target */
				target = sbp_alloc_target(sbp, fwdev);
				if (target == NULL)
					continue;
			} else {
				continue;
			}
		}

		/*
		 * It is safe to drop the lock here as the target is already
		 * reserved, so there should be no contenders for it.
		 * And the target is not yet exposed, so there should not be
		 * any other accesses to it.
		 * Finally, the list being iterated is protected somewhere else.
		 */
		SBP_UNLOCK(sbp);
		sbp_probe_target(target);
		SBP_LOCK(sbp);
		if (target->num_lun == 0)
			sbp_free_target(target);
	}
	if ((sbp->flags & SIMQ_FREEZED) != 0) {
		xpt_release_simq(sbp->sim, /*run queue*/TRUE);
		sbp->flags &= ~SIMQ_FREEZED;
	}
	SBP_UNLOCK(sbp);
}

#if NEED_RESPONSE
static void
sbp_loginres_callback(struct fw_xfer *xfer)
{
	struct sbp_dev *sdev;
	sdev = (struct sbp_dev *)xfer->sc;
SBP_DEBUG(1)
	device_printf(sdev->target->sbp->fd.dev,"%s\n", __func__);
END_DEBUG
	/* recycle */
	SBP_LOCK(sdev->target->sbp);
	STAILQ_INSERT_TAIL(&sdev->target->sbp->fwb.xferlist, xfer, link);
	SBP_UNLOCK(sdev->target->sbp);
	return;
}
#endif

static __inline void
sbp_xfer_free(struct fw_xfer *xfer)
{
	struct sbp_dev *sdev;

	sdev = (struct sbp_dev *)xfer->sc;
	fw_xfer_unload(xfer);
	SBP_LOCK_ASSERT(sdev->target->sbp);
	STAILQ_INSERT_TAIL(&sdev->target->xferlist, xfer, link);
}

static void
sbp_reset_start_callback(struct fw_xfer *xfer)
{
	struct sbp_dev *tsdev, *sdev = (struct sbp_dev *)xfer->sc;
	struct sbp_target *target = sdev->target;
	int i;

	if (xfer->resp != 0) {
		device_printf(sdev->target->sbp->fd.dev,
			"%s: %s failed: resp=%d\n", __func__, sdev->bustgtlun, xfer->resp);
	}

	SBP_LOCK(target->sbp);
	for (i = 0; i < target->num_lun; i++) {
		tsdev = target->luns[i];
		if (tsdev != NULL && tsdev->status == SBP_DEV_LOGIN)
			sbp_login(tsdev);
	}
	SBP_UNLOCK(target->sbp);
}

static void
sbp_reset_start(struct sbp_dev *sdev)
{
	struct fw_xfer *xfer;
	struct fw_pkt *fp;

SBP_DEBUG(0)
	device_printf(sdev->target->sbp->fd.dev,
			"%s:%s\n", __func__,sdev->bustgtlun);
END_DEBUG

	xfer = sbp_write_cmd(sdev, FWTCODE_WREQQ, 0);
	xfer->hand = sbp_reset_start_callback;
	fp = &xfer->send.hdr;
	fp->mode.wreqq.dest_hi = 0xffff;
	fp->mode.wreqq.dest_lo = 0xf0000000 | RESET_START;
	fp->mode.wreqq.data = htonl(0xf);
	fw_asyreq(xfer->fc, -1, xfer);
}

static void
sbp_mgm_callback(struct fw_xfer *xfer)
{
	struct sbp_dev *sdev;
	int resp;

	sdev = (struct sbp_dev *)xfer->sc;

SBP_DEBUG(1)
	device_printf(sdev->target->sbp->fd.dev,
		"%s:%s\n", __func__, sdev->bustgtlun);
END_DEBUG
	resp = xfer->resp;
	SBP_LOCK(sdev->target->sbp);
	sbp_xfer_free(xfer);
	SBP_UNLOCK(sdev->target->sbp);
}

static struct sbp_dev *
sbp_next_dev(struct sbp_target *target, int lun)
{
	struct sbp_dev **sdevp;
	int i;

	for (i = lun, sdevp = &target->luns[lun]; i < target->num_lun;
	    i++, sdevp++)
		if (*sdevp != NULL && (*sdevp)->status == SBP_DEV_PROBE)
			return (*sdevp);
	return (NULL);
}

#define SCAN_PRI 1
static void
sbp_cam_scan_lun(struct cam_periph *periph, union ccb *ccb)
{
	struct sbp_softc *sbp;
	struct sbp_target *target;
	struct sbp_dev *sdev;

	sdev = (struct sbp_dev *) ccb->ccb_h.ccb_sdev_ptr;
	target = sdev->target;
	sbp = target->sbp;
	SBP_LOCK(sbp);
SBP_DEBUG(0)
	device_printf(sbp->fd.dev,
		"%s:%s\n", __func__, sdev->bustgtlun);
END_DEBUG
	if ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP) {
		sdev->status = SBP_DEV_ATTACHED;
	} else {
		device_printf(sbp->fd.dev,
			"%s:%s failed\n", __func__, sdev->bustgtlun);
	}
	sdev = sbp_next_dev(target, sdev->lun_id + 1);
	if (sdev == NULL) {
		SBP_UNLOCK(sbp);
		xpt_free_ccb(ccb);
		return;
	}
	/* reuse ccb */
	xpt_setup_ccb(&ccb->ccb_h, sdev->path, SCAN_PRI);
	ccb->ccb_h.ccb_sdev_ptr = sdev;
	ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
	SBP_UNLOCK(sbp);

	xpt_action(ccb);
	xpt_release_devq(sdev->path, sdev->freeze, TRUE);
	sdev->freeze = 1;
}

static void
sbp_cam_scan_target(void *arg)
{
	struct sbp_target *target = (struct sbp_target *)arg;
	struct sbp_dev *sdev;
	union ccb *ccb;

	SBP_LOCK_ASSERT(target->sbp);
	sdev = sbp_next_dev(target, 0);
	if (sdev == NULL) {
		printf("sbp_cam_scan_target: nothing to do for target%d\n",
							target->target_id);
		return;
	}
SBP_DEBUG(0)
	device_printf(sdev->target->sbp->fd.dev,
		"%s:%s\n", __func__, sdev->bustgtlun);
END_DEBUG
	ccb = xpt_alloc_ccb_nowait();
	if (ccb == NULL) {
		printf("sbp_cam_scan_target: xpt_alloc_ccb_nowait() failed\n");
		return;
	}
	SBP_UNLOCK(target->sbp);

	xpt_setup_ccb(&ccb->ccb_h, sdev->path, SCAN_PRI);
	ccb->ccb_h.func_code = XPT_SCAN_LUN;
	ccb->ccb_h.cbfcnp = sbp_cam_scan_lun;
	ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
	ccb->crcn.flags = CAM_FLAG_NONE;
	ccb->ccb_h.ccb_sdev_ptr = sdev;

	/* The scan is in progress now. */
	xpt_action(ccb);

	SBP_LOCK(target->sbp);
	xpt_release_devq(sdev->path, sdev->freeze, TRUE);
	sdev->freeze = 1;
}

static __inline void
sbp_scan_dev(struct sbp_dev *sdev)
{
	sdev->status = SBP_DEV_PROBE;
	callout_reset_sbt(&sdev->target->scan_callout, SBT_1MS * scan_delay, 0,
	    sbp_cam_scan_target, (void *)sdev->target, 0);
}

static void
sbp_do_attach(struct fw_xfer *xfer)
{
	struct sbp_dev *sdev;
	struct sbp_target *target;
	struct sbp_softc *sbp;

	sdev = (struct sbp_dev *)xfer->sc;
	target = sdev->target;
	sbp = target->sbp;
	SBP_LOCK(sbp);
SBP_DEBUG(0)
	device_printf(sdev->target->sbp->fd.dev,
		"%s:%s\n", __func__, sdev->bustgtlun);
END_DEBUG
	sbp_xfer_free(xfer);

	if (sdev->path == NULL)
		xpt_create_path(&sdev->path, NULL,
			cam_sim_path(target->sbp->sim),
			target->target_id, sdev->lun_id);

	/*
	 * Let CAM scan the bus if we are in the boot process.
	 * XXX xpt_scan_bus cannot detect LUN larger than 0
	 * if LUN 0 doesn't exist.
	 */
	if (sbp_cold > 0) {
		sdev->status = SBP_DEV_ATTACHED;
		SBP_UNLOCK(sbp);
		return;
	}

	sbp_scan_dev(sdev);
	SBP_UNLOCK(sbp);
}

static void
sbp_agent_reset_callback(struct fw_xfer *xfer)
{
	struct sbp_dev *sdev;

	sdev = (struct sbp_dev *)xfer->sc;
SBP_DEBUG(1)
	device_printf(sdev->target->sbp->fd.dev,
			"%s:%s\n", __func__, sdev->bustgtlun);
END_DEBUG
	if (xfer->resp != 0) {
		device_printf(sdev->target->sbp->fd.dev,
			"%s:%s resp=%d\n", __func__, sdev->bustgtlun, xfer->resp);
	}

	SBP_LOCK(sdev->target->sbp);
	sbp_xfer_free(xfer);
	if (sdev->path) {
		xpt_release_devq(sdev->path, sdev->freeze, TRUE);
		sdev->freeze = 0;
	}
	SBP_UNLOCK(sdev->target->sbp);
}

static void
sbp_agent_reset(struct sbp_dev *sdev)
{
	struct fw_xfer *xfer;
	struct fw_pkt *fp;

	SBP_LOCK_ASSERT(sdev->target->sbp);
SBP_DEBUG(0)
	device_printf(sdev->target->sbp->fd.dev,
		"%s:%s\n", __func__, sdev->bustgtlun);
END_DEBUG
	xfer = sbp_write_cmd(sdev, FWTCODE_WREQQ, 0x04);
	if (xfer == NULL)
		return;
	if (sdev->status == SBP_DEV_ATTACHED || sdev->status == SBP_DEV_PROBE)
		xfer->hand = sbp_agent_reset_callback;
	else
		xfer->hand = sbp_do_attach;
	fp = &xfer->send.hdr;
	fp->mode.wreqq.data = htonl(0xf);
	fw_asyreq(xfer->fc, -1, xfer);
	sbp_abort_all_ocbs(sdev, CAM_BDR_SENT);
}

static void
sbp_busy_timeout_callback(struct fw_xfer *xfer)
{
	struct sbp_dev *sdev;

	sdev = (struct sbp_dev *)xfer->sc;
SBP_DEBUG(1)
	device_printf(sdev->target->sbp->fd.dev,
		"%s:%s\n", __func__, sdev->bustgtlun);
END_DEBUG
	SBP_LOCK(sdev->target->sbp);
	sbp_xfer_free(xfer);
	sbp_agent_reset(sdev);
	SBP_UNLOCK(sdev->target->sbp);
}

static void
sbp_busy_timeout(struct sbp_dev *sdev)
{
	struct fw_pkt *fp;
	struct fw_xfer *xfer;
SBP_DEBUG(0)
	device_printf(sdev->target->sbp->fd.dev,
		"%s:%s\n", __func__, sdev->bustgtlun);
END_DEBUG
	xfer = sbp_write_cmd(sdev, FWTCODE_WREQQ, 0);

	xfer->hand = sbp_busy_timeout_callback;
	fp = &xfer->send.hdr;
	fp->mode.wreqq.dest_hi = 0xffff;
	fp->mode.wreqq.dest_lo = 0xf0000000 | BUSY_TIMEOUT;
	fp->mode.wreqq.data = htonl((1 << (13 + 12)) | 0xf);
	fw_asyreq(xfer->fc, -1, xfer);
}

static void
sbp_orb_pointer_callback(struct fw_xfer *xfer)
{
	struct sbp_dev *sdev;
	sdev = (struct sbp_dev *)xfer->sc;

SBP_DEBUG(2)
	device_printf(sdev->target->sbp->fd.dev,
		"%s:%s\n", __func__, sdev->bustgtlun);
END_DEBUG
	if (xfer->resp != 0) {
		/* XXX */
		printf("%s: xfer->resp = %d\n", __func__, xfer->resp);
	}
	SBP_LOCK(sdev->target->sbp);
	sbp_xfer_free(xfer);

	sdev->flags &= ~ORB_POINTER_ACTIVE;

	if ((sdev->flags & ORB_POINTER_NEED) != 0) {
		struct sbp_ocb *ocb;

		sdev->flags &= ~ORB_POINTER_NEED;
		ocb = STAILQ_FIRST(&sdev->ocbs);
		if (ocb != NULL)
			sbp_orb_pointer(sdev, ocb);
	}
	SBP_UNLOCK(sdev->target->sbp);
	return;
}

static void
sbp_orb_pointer(struct sbp_dev *sdev, struct sbp_ocb *ocb)
{
	struct fw_xfer *xfer;
	struct fw_pkt *fp;
SBP_DEBUG(1)
	device_printf(sdev->target->sbp->fd.dev,
		"%s:%s 0x%08x\n",
		__func__, sdev->bustgtlun,
		(uint32_t)ocb->bus_addr);
END_DEBUG

	SBP_LOCK_ASSERT(sdev->target->sbp);

	if ((sdev->flags & ORB_POINTER_ACTIVE) != 0) {
SBP_DEBUG(0)
		printf("%s: orb pointer active\n", __func__);
END_DEBUG
		sdev->flags |= ORB_POINTER_NEED;
		return;
	}

	sdev->flags |= ORB_POINTER_ACTIVE;
	xfer = sbp_write_cmd(sdev, FWTCODE_WREQB, 0x08);
	if (xfer == NULL)
		return;
	xfer->hand = sbp_orb_pointer_callback;

	fp = &xfer->send.hdr;
	fp->mode.wreqb.len = 8;
	fp->mode.wreqb.extcode = 0;
	xfer->send.payload[0] =
		htonl(((sdev->target->sbp->fd.fc->nodeid | FWLOCALBUS) << 16));
	xfer->send.payload[1] = htonl((uint32_t)ocb->bus_addr);

	if (fw_asyreq(xfer->fc, -1, xfer) != 0) {
		sbp_xfer_free(xfer);
		ocb->ccb->ccb_h.status = CAM_REQ_INVALID;
		xpt_done(ocb->ccb);
	}
}

static void
sbp_doorbell_callback(struct fw_xfer *xfer)
{
	struct sbp_dev *sdev;
	sdev = (struct sbp_dev *)xfer->sc;

SBP_DEBUG(1)
	device_printf(sdev->target->sbp->fd.dev,
		"%s:%s\n", __func__, sdev->bustgtlun);
END_DEBUG
	if (xfer->resp != 0) {
		/* XXX */
		device_printf(sdev->target->sbp->fd.dev,
			"%s: xfer->resp = %d\n", __func__, xfer->resp);
	}
	SBP_LOCK(sdev->target->sbp);
	sbp_xfer_free(xfer);
	sdev->flags &= ~ORB_DOORBELL_ACTIVE;
	if ((sdev->flags & ORB_DOORBELL_NEED) != 0) {
		sdev->flags &= ~ORB_DOORBELL_NEED;
		sbp_doorbell(sdev);
	}
	SBP_UNLOCK(sdev->target->sbp);
}

static void
sbp_doorbell(struct sbp_dev *sdev)
{
	struct fw_xfer *xfer;
	struct fw_pkt *fp;
SBP_DEBUG(1)
	device_printf(sdev->target->sbp->fd.dev,
		"%s:%s\n", __func__, sdev->bustgtlun);
END_DEBUG

	if ((sdev->flags & ORB_DOORBELL_ACTIVE) != 0) {
		sdev->flags |= ORB_DOORBELL_NEED;
		return;
	}
	sdev->flags |= ORB_DOORBELL_ACTIVE;
	xfer = sbp_write_cmd(sdev, FWTCODE_WREQQ, 0x10);
	if (xfer == NULL)
		return;
	xfer->hand = sbp_doorbell_callback;
	fp = &xfer->send.hdr;
	fp->mode.wreqq.data = htonl(0xf);
	fw_asyreq(xfer->fc, -1, xfer);
}

static struct fw_xfer *
sbp_write_cmd(struct sbp_dev *sdev, int tcode, int offset)
{
	struct fw_xfer *xfer;
	struct fw_pkt *fp;
	struct sbp_target *target;
	int new = 0;

	SBP_LOCK_ASSERT(sdev->target->sbp);

	target = sdev->target;
	xfer = STAILQ_FIRST(&target->xferlist);
	if (xfer == NULL) {
		if (target->n_xfer > 5 /* XXX */) {
			printf("sbp: no more xfer for this target\n");
			return (NULL);
		}
		xfer = fw_xfer_alloc_buf(M_SBP, 8, 0);
		if (xfer == NULL) {
			printf("sbp: fw_xfer_alloc_buf failed\n");
			return NULL;
		}
		target->n_xfer++;
		if (debug)
			printf("sbp: alloc %d xfer\n", target->n_xfer);
		new = 1;
	} else {
		STAILQ_REMOVE_HEAD(&target->xferlist, link);
	}

	if (new) {
		xfer->recv.pay_len = 0;
		xfer->send.spd = min(sdev->target->fwdev->speed, max_speed);
		xfer->fc = sdev->target->sbp->fd.fc;
	}

	if (tcode == FWTCODE_WREQB)
		xfer->send.pay_len = 8;
	else
		xfer->send.pay_len = 0;

	xfer->sc = (caddr_t)sdev;
	fp = &xfer->send.hdr;
	fp->mode.wreqq.dest_hi = sdev->login->cmd_hi;
	fp->mode.wreqq.dest_lo = sdev->login->cmd_lo + offset;
	fp->mode.wreqq.tlrt = 0;
	fp->mode.wreqq.tcode = tcode;
	fp->mode.wreqq.pri = 0;
	fp->mode.wreqq.dst = FWLOCALBUS | sdev->target->fwdev->dst;

	return xfer;
}

static void
sbp_mgm_orb(struct sbp_dev *sdev, int func, struct sbp_ocb *aocb)
{
	struct fw_xfer *xfer;
	struct fw_pkt *fp;
	struct sbp_ocb *ocb;
	struct sbp_target *target;
	int nid;

	target = sdev->target;
	nid = target->sbp->fd.fc->nodeid | FWLOCALBUS;

	SBP_LOCK_ASSERT(target->sbp);
	if (func == ORB_FUN_RUNQUEUE) {
		ocb = STAILQ_FIRST(&target->mgm_ocb_queue);
		if (target->mgm_ocb_cur != NULL || ocb == NULL) {
			return;
		}
		STAILQ_REMOVE_HEAD(&target->mgm_ocb_queue, ocb);
		goto start;
	}
	if ((ocb = sbp_get_ocb(sdev)) == NULL) {
		/* XXX */
		return;
	}
	ocb->flags = OCB_ACT_MGM;
	ocb->sdev = sdev;

	bzero((void *)ocb->orb, sizeof(ocb->orb));
	ocb->orb[6] = htonl((nid << 16) | SBP_BIND_HI);
	ocb->orb[7] = htonl(SBP_DEV2ADDR(target->target_id, sdev->lun_id));

SBP_DEBUG(0)
	device_printf(sdev->target->sbp->fd.dev,
		 "%s:%s %s\n",
		 __func__,sdev->bustgtlun,
		 orb_fun_name[(func >> 16) & 0xf]);
END_DEBUG
	switch (func) {
	case ORB_FUN_LGI:
		ocb->orb[0] = ocb->orb[1] = 0; /* password */
		ocb->orb[2] = htonl(nid << 16);
		ocb->orb[3] = htonl(sdev->dma.bus_addr);
		ocb->orb[4] = htonl(ORB_NOTIFY | sdev->lun_id);
		if (ex_login)
			ocb->orb[4] |= htonl(ORB_EXV);
		ocb->orb[5] = htonl(SBP_LOGIN_SIZE);
		fwdma_sync(&sdev->dma, BUS_DMASYNC_PREREAD);
		break;
	case ORB_FUN_ATA:
		ocb->orb[0] = htonl((0 << 16) | 0);
		ocb->orb[1] = htonl(aocb->bus_addr & 0xffffffff);
		/* fall through */
	case ORB_FUN_RCN:
	case ORB_FUN_LGO:
	case ORB_FUN_LUR:
	case ORB_FUN_RST:
	case ORB_FUN_ATS:
		ocb->orb[4] = htonl(ORB_NOTIFY | func | sdev->login->id);
		break;
	}

	if (target->mgm_ocb_cur != NULL) {
		/* there is a standing ORB */
		STAILQ_INSERT_TAIL(&sdev->target->mgm_ocb_queue, ocb, ocb);
		return;
	}
start:
	target->mgm_ocb_cur = ocb;

	callout_reset(&target->mgm_ocb_timeout, 5 * hz,
				sbp_mgm_timeout, (caddr_t)ocb);
	xfer = sbp_write_cmd(sdev, FWTCODE_WREQB, 0);
	if (xfer == NULL) {
		return;
	}
	xfer->hand = sbp_mgm_callback;

	fp = &xfer->send.hdr;
	fp->mode.wreqb.dest_hi = sdev->target->mgm_hi;
	fp->mode.wreqb.dest_lo = sdev->target->mgm_lo;
	fp->mode.wreqb.len = 8;
	fp->mode.wreqb.extcode = 0;
	xfer->send.payload[0] = htonl(nid << 16);
	xfer->send.payload[1] = htonl(ocb->bus_addr & 0xffffffff);

	fw_asyreq(xfer->fc, -1, xfer);
}

static void
sbp_print_scsi_cmd(struct sbp_ocb *ocb)
{
	struct ccb_scsiio *csio;

	csio = &ocb->ccb->csio;
	printf("%s:%d:%jx XPT_SCSI_IO: "
		"cmd: %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x"
		", flags: 0x%02x, "
		"%db cmd/%db data/%db sense\n",
		device_get_nameunit(ocb->sdev->target->sbp->fd.dev),
		ocb->ccb->ccb_h.target_id,
		(uintmax_t)ocb->ccb->ccb_h.target_lun,
		csio->cdb_io.cdb_bytes[0],
		csio->cdb_io.cdb_bytes[1],
		csio->cdb_io.cdb_bytes[2],
		csio->cdb_io.cdb_bytes[3],
		csio->cdb_io.cdb_bytes[4],
		csio->cdb_io.cdb_bytes[5],
		csio->cdb_io.cdb_bytes[6],
		csio->cdb_io.cdb_bytes[7],
		csio->cdb_io.cdb_bytes[8],
		csio->cdb_io.cdb_bytes[9],
		ocb->ccb->ccb_h.flags & CAM_DIR_MASK,
		csio->cdb_len, csio->dxfer_len,
		csio->sense_len);
}

static void
sbp_scsi_status(struct sbp_status *sbp_status, struct sbp_ocb *ocb)
{
	struct sbp_cmd_status *sbp_cmd_status;
	struct scsi_sense_data_fixed *sense;

	sbp_cmd_status = (struct sbp_cmd_status *)sbp_status->data;
	sense = (struct scsi_sense_data_fixed *)&ocb->ccb->csio.sense_data;

SBP_DEBUG(0)
	sbp_print_scsi_cmd(ocb);
	/* XXX need decode status */
	printf("%s: SCSI status %x sfmt %x valid %x key %x code %x qlfr %x len %d\n",
		ocb->sdev->bustgtlun,
		sbp_cmd_status->status,
		sbp_cmd_status->sfmt,
		sbp_cmd_status->valid,
		sbp_cmd_status->s_key,
		sbp_cmd_status->s_code,
		sbp_cmd_status->s_qlfr,
		sbp_status->len);
END_DEBUG

	switch (sbp_cmd_status->status) {
	case SCSI_STATUS_CHECK_COND:
	case SCSI_STATUS_BUSY:
	case SCSI_STATUS_CMD_TERMINATED:
		if (sbp_cmd_status->sfmt == SBP_SFMT_CURR) {
			sense->error_code = SSD_CURRENT_ERROR;
		} else {
			sense->error_code = SSD_DEFERRED_ERROR;
		}
		if (sbp_cmd_status->valid)
			sense->error_code |= SSD_ERRCODE_VALID;
		sense->flags = sbp_cmd_status->s_key;
		if (sbp_cmd_status->mark)
			sense->flags |= SSD_FILEMARK;
		if (sbp_cmd_status->eom)
			sense->flags |= SSD_EOM;
		if (sbp_cmd_status->ill_len)
			sense->flags |= SSD_ILI;

		bcopy(&sbp_cmd_status->info, &sense->info[0], 4);

		if (sbp_status->len <= 1)
			/* XXX not scsi status. shouldn't be happened */
			sense->extra_len = 0;
		else if (sbp_status->len <= 4)
			/* add_sense_code(_qual), info, cmd_spec_info */
			sense->extra_len = 6;
		else
			/* fru, sense_key_spec */
			sense->extra_len = 10;

		bcopy(&sbp_cmd_status->cdb, &sense->cmd_spec_info[0], 4);

		sense->add_sense_code = sbp_cmd_status->s_code;
		sense->add_sense_code_qual = sbp_cmd_status->s_qlfr;
		sense->fru = sbp_cmd_status->fru;

		bcopy(&sbp_cmd_status->s_keydep[0],
		    &sense->sense_key_spec[0], 3);

		ocb->ccb->csio.scsi_status = sbp_cmd_status->status;
		ocb->ccb->ccb_h.status = CAM_SCSI_STATUS_ERROR
							| CAM_AUTOSNS_VALID;
/*
{
		uint8_t j, *tmp;
		tmp = sense;
		for (j = 0; j < 32; j += 8) {
			printf("sense %02x%02x %02x%02x %02x%02x %02x%02x\n",
				tmp[j], tmp[j + 1], tmp[j + 2], tmp[j + 3],
				tmp[j + 4], tmp[j + 5], tmp[j + 6], tmp[j + 7]);
		}

}
*/
		break;
	default:
		device_printf(ocb->sdev->target->sbp->fd.dev,
				"%s:%s unknown scsi status 0x%x\n",
				__func__, ocb->sdev->bustgtlun,
				sbp_cmd_status->status);
	}
}

static void
sbp_fix_inq_data(struct sbp_ocb *ocb)
{
	union ccb *ccb;
	struct sbp_dev *sdev;
	struct scsi_inquiry_data *inq;

	ccb = ocb->ccb;
	sdev = ocb->sdev;

	if (ccb->csio.cdb_io.cdb_bytes[1] & SI_EVPD)
		return;
SBP_DEBUG(1)
	device_printf(sdev->target->sbp->fd.dev,
		"%s:%s\n", __func__, sdev->bustgtlun);
END_DEBUG
	inq = (struct scsi_inquiry_data *) ccb->csio.data_ptr;
	switch (SID_TYPE(inq)) {
	case T_DIRECT:
#if 0
		/*
		 * XXX Convert Direct Access device to RBC.
		 * I've never seen FireWire DA devices which support READ_6.
		 */
		if (SID_TYPE(inq) == T_DIRECT)
			inq->device |= T_RBC; /*  T_DIRECT == 0 */
#endif
		/* fall through */
	case T_RBC:
		/*
		 * Override vendor/product/revision information.
		 * Some devices sometimes return strange strings.
		 */
#if 1
		bcopy(sdev->vendor, inq->vendor, sizeof(inq->vendor));
		bcopy(sdev->product, inq->product, sizeof(inq->product));
		bcopy(sdev->revision + 2, inq->revision, sizeof(inq->revision));
#endif
		break;
	}
	/*
	 * Force to enable/disable tagged queuing.
	 * XXX CAM also checks SCP_QUEUE_DQUE flag in the control mode page.
	 */
	if (sbp_tags > 0)
		inq->flags |= SID_CmdQue;
	else if (sbp_tags < 0)
		inq->flags &= ~SID_CmdQue;

}

static void
sbp_recv1(struct fw_xfer *xfer)
{
	struct fw_pkt *rfp;
#if NEED_RESPONSE
	struct fw_pkt *sfp;
#endif
	struct sbp_softc *sbp;
	struct sbp_dev *sdev;
	struct sbp_ocb *ocb;
	struct sbp_login_res *login_res = NULL;
	struct sbp_status *sbp_status;
	struct sbp_target *target;
	int	orb_fun, status_valid0, status_valid, t, l, reset_agent = 0;
	uint32_t addr;
/*
	uint32_t *ld;
	ld = xfer->recv.buf;
printf("sbp %x %d %d %08x %08x %08x %08x\n",
			xfer->resp, xfer->recv.len, xfer->recv.off, ntohl(ld[0]), ntohl(ld[1]), ntohl(ld[2]), ntohl(ld[3]));
printf("sbp %08x %08x %08x %08x\n", ntohl(ld[4]), ntohl(ld[5]), ntohl(ld[6]), ntohl(ld[7]));
printf("sbp %08x %08x %08x %08x\n", ntohl(ld[8]), ntohl(ld[9]), ntohl(ld[10]), ntohl(ld[11]));
*/
	sbp = (struct sbp_softc *)xfer->sc;
	SBP_LOCK_ASSERT(sbp);
	if (xfer->resp != 0) {
		printf("sbp_recv: xfer->resp = %d\n", xfer->resp);
		goto done0;
	}
	if (xfer->recv.payload == NULL) {
		printf("sbp_recv: xfer->recv.payload == NULL\n");
		goto done0;
	}
	rfp = &xfer->recv.hdr;
	if (rfp->mode.wreqb.tcode != FWTCODE_WREQB) {
		printf("sbp_recv: tcode = %d\n", rfp->mode.wreqb.tcode);
		goto done0;
	}
	sbp_status = (struct sbp_status *)xfer->recv.payload;
	addr = rfp->mode.wreqb.dest_lo;
SBP_DEBUG(2)
	printf("received address 0x%x\n", addr);
END_DEBUG
	t = SBP_ADDR2TRG(addr);
	if (t >= SBP_NUM_TARGETS) {
		device_printf(sbp->fd.dev,
			"sbp_recv1: invalid target %d\n", t);
		goto done0;
	}
	target = &sbp->targets[t];
	l = SBP_ADDR2LUN(addr);
	if (l >= target->num_lun || target->luns[l] == NULL) {
		device_printf(sbp->fd.dev,
			"sbp_recv1: invalid lun %d (target=%d)\n", l, t);
		goto done0;
	}
	sdev = target->luns[l];

	ocb = NULL;
	switch (sbp_status->src) {
	case 0:
	case 1:
		/* check mgm_ocb_cur first */
		ocb  = target->mgm_ocb_cur;
		if (ocb != NULL) {
			if (OCB_MATCH(ocb, sbp_status)) {
				callout_stop(&target->mgm_ocb_timeout);
				target->mgm_ocb_cur = NULL;
				break;
			}
		}
		ocb = sbp_dequeue_ocb(sdev, sbp_status);
		if (ocb == NULL) {
			device_printf(sdev->target->sbp->fd.dev,
				"%s:%s No ocb(%x) on the queue\n",
				__func__,sdev->bustgtlun,
				ntohl(sbp_status->orb_lo));
		}
		break;
	case 2:
		/* unsolicit */
		device_printf(sdev->target->sbp->fd.dev,
			"%s:%s unsolicit status received\n",
			__func__, sdev->bustgtlun);
		break;
	default:
		device_printf(sdev->target->sbp->fd.dev,
			"%s:%s unknown sbp_status->src\n",
			__func__, sdev->bustgtlun);
	}

	status_valid0 = (sbp_status->src < 2
			&& sbp_status->resp == ORB_RES_CMPL
			&& sbp_status->dead == 0);
	status_valid = (status_valid0 && sbp_status->status == 0);

	if (!status_valid0 || debug > 2) {
		int status;
SBP_DEBUG(0)
		device_printf(sdev->target->sbp->fd.dev,
			"%s:%s ORB status src:%x resp:%x dead:%x"
				" len:%x stat:%x orb:%x%08x\n",
			__func__, sdev->bustgtlun,
			sbp_status->src, sbp_status->resp, sbp_status->dead,
			sbp_status->len, sbp_status->status,
			ntohs(sbp_status->orb_hi), ntohl(sbp_status->orb_lo));
END_DEBUG
		device_printf(sdev->target->sbp->fd.dev,
				"%s\n", sdev->bustgtlun);
		status = sbp_status->status;
		switch (sbp_status->resp) {
		case 0:
			if (status > MAX_ORB_STATUS0)
				printf("%s\n", orb_status0[MAX_ORB_STATUS0]);
			else
				printf("%s\n", orb_status0[status]);
			break;
		case 1:
			printf("Obj: %s, Error: %s\n",
				orb_status1_object[(status >> 6) & 3],
				orb_status1_serial_bus_error[status & 0xf]);
			break;
		case 2:
			printf("Illegal request\n");
			break;
		case 3:
			printf("Vendor dependent\n");
			break;
		default:
			printf("unknown respose code %d\n", sbp_status->resp);
		}
	}

	/* we have to reset the fetch agent if it's dead */
	if (sbp_status->dead) {
		if (sdev->path) {
			xpt_freeze_devq(sdev->path, 1);
			sdev->freeze++;
		}
		reset_agent = 1;
	}

	if (ocb == NULL)
		goto done;

	switch (ntohl(ocb->orb[4]) & ORB_FMT_MSK) {
	case ORB_FMT_NOP:
		break;
	case ORB_FMT_VED:
		break;
	case ORB_FMT_STD:
		switch (ocb->flags) {
		case OCB_ACT_MGM:
			orb_fun = ntohl(ocb->orb[4]) & ORB_FUN_MSK;
			reset_agent = 0;
			switch (orb_fun) {
			case ORB_FUN_LGI:
				fwdma_sync(&sdev->dma, BUS_DMASYNC_POSTREAD);
				login_res = sdev->login;
				login_res->len = ntohs(login_res->len);
				login_res->id = ntohs(login_res->id);
				login_res->cmd_hi = ntohs(login_res->cmd_hi);
				login_res->cmd_lo = ntohl(login_res->cmd_lo);
				if (status_valid) {
SBP_DEBUG(0)
					device_printf(sdev->target->sbp->fd.dev,
						"%s:%s login: len %d, ID %d, cmd %08x%08x, recon_hold %d\n",
						__func__, sdev->bustgtlun,
						login_res->len, login_res->id,
						login_res->cmd_hi, login_res->cmd_lo,
						ntohs(login_res->recon_hold));
END_DEBUG
					sbp_busy_timeout(sdev);
				} else {
					/* forgot logout? */
					device_printf(sdev->target->sbp->fd.dev,
						"%s:%s login failed\n",
						__func__, sdev->bustgtlun);
					sdev->status = SBP_DEV_RESET;
				}
				break;
			case ORB_FUN_RCN:
				login_res = sdev->login;
				if (status_valid) {
SBP_DEBUG(0)
					device_printf(sdev->target->sbp->fd.dev,
						"%s:%s reconnect: len %d, ID %d, cmd %08x%08x\n",
						__func__, sdev->bustgtlun,
						login_res->len, login_res->id,
						login_res->cmd_hi, login_res->cmd_lo);
END_DEBUG
					if (sdev->status == SBP_DEV_ATTACHED)
						sbp_scan_dev(sdev);
					else
						sbp_agent_reset(sdev);
				} else {
					/* reconnection hold time exceed? */
SBP_DEBUG(0)
					device_printf(sdev->target->sbp->fd.dev,
						"%s:%s reconnect failed\n",
						__func__, sdev->bustgtlun);
END_DEBUG
					sbp_login(sdev);
				}
				break;
			case ORB_FUN_LGO:
				sdev->status = SBP_DEV_RESET;
				break;
			case ORB_FUN_RST:
				sbp_busy_timeout(sdev);
				break;
			case ORB_FUN_LUR:
			case ORB_FUN_ATA:
			case ORB_FUN_ATS:
				sbp_agent_reset(sdev);
				break;
			default:
				device_printf(sdev->target->sbp->fd.dev,
					"%s:%s unknown function %d\n",
					__func__, sdev->bustgtlun, orb_fun);
				break;
			}
			sbp_mgm_orb(sdev, ORB_FUN_RUNQUEUE, NULL);
			break;
		case OCB_ACT_CMD:
			sdev->timeout = 0;
			if (ocb->ccb != NULL) {
				union ccb *ccb;

				ccb = ocb->ccb;
				if (sbp_status->len > 1) {
					sbp_scsi_status(sbp_status, ocb);
				} else {
					if (sbp_status->resp != ORB_RES_CMPL) {
						ccb->ccb_h.status = CAM_REQ_CMP_ERR;
					} else {
						ccb->ccb_h.status = CAM_REQ_CMP;
					}
				}
				/* fix up inq data */
				if (ccb->csio.cdb_io.cdb_bytes[0] == INQUIRY)
					sbp_fix_inq_data(ocb);
				xpt_done(ccb);
			}
			break;
		default:
			break;
		}
	}

	if (!use_doorbell)
		sbp_free_ocb(sdev, ocb);
done:
	if (reset_agent)
		sbp_agent_reset(sdev);

done0:
	xfer->recv.pay_len = SBP_RECV_LEN;
/* The received packet is usually small enough to be stored within
 * the buffer. In that case, the controller return ack_complete and
 * no respose is necessary.
 *
 * XXX fwohci.c and firewire.c should inform event_code such as
 * ack_complete or ack_pending to upper driver.
 */
#if NEED_RESPONSE
	xfer->send.off = 0;
	sfp = (struct fw_pkt *)xfer->send.buf;
	sfp->mode.wres.dst = rfp->mode.wreqb.src;
	xfer->dst = sfp->mode.wres.dst;
	xfer->spd = min(sdev->target->fwdev->speed, max_speed);
	xfer->hand = sbp_loginres_callback;

	sfp->mode.wres.tlrt = rfp->mode.wreqb.tlrt;
	sfp->mode.wres.tcode = FWTCODE_WRES;
	sfp->mode.wres.rtcode = 0;
	sfp->mode.wres.pri = 0;

	fw_asyreq(xfer->fc, -1, xfer);
#else
	/* recycle */
	STAILQ_INSERT_TAIL(&sbp->fwb.xferlist, xfer, link);
#endif
}

static void
sbp_recv(struct fw_xfer *xfer)
{
	struct sbp_softc *sbp;

	sbp = (struct sbp_softc *)xfer->sc;
	SBP_LOCK(sbp);
	sbp_recv1(xfer);
	SBP_UNLOCK(sbp);
}
/*
 * sbp_attach()
 */
static int
sbp_attach(device_t dev)
{
	struct sbp_softc *sbp;
	struct cam_devq *devq;
	struct firewire_comm *fc;
	int i, error;

	if (DFLTPHYS > SBP_MAXPHYS)
		device_printf(dev, "Warning, DFLTPHYS(%dKB) is larger than "
			"SBP_MAXPHYS(%dKB).\n", DFLTPHYS / 1024,
			SBP_MAXPHYS / 1024);

	if (!firewire_phydma_enable)
		device_printf(dev, "Warning, hw.firewire.phydma_enable must be 1 "
			"for SBP over FireWire.\n");
SBP_DEBUG(0)
	printf("sbp_attach (cold=%d)\n", cold);
END_DEBUG

	if (cold)
		sbp_cold++;
	sbp = device_get_softc(dev);
	sbp->fd.dev = dev;
	sbp->fd.fc = fc = device_get_ivars(dev);
	mtx_init(&sbp->mtx, "sbp", NULL, MTX_DEF);

	if (max_speed < 0)
		max_speed = fc->speed;

	error = bus_dma_tag_create(/*parent*/fc->dmat,
				/* XXX shoud be 4 for sane backend? */
				/*alignment*/1,
				/*boundary*/0,
				/*lowaddr*/BUS_SPACE_MAXADDR_32BIT,
				/*highaddr*/BUS_SPACE_MAXADDR,
				/*filter*/NULL, /*filterarg*/NULL,
				/*maxsize*/0x100000, /*nsegments*/SBP_IND_MAX,
				/*maxsegsz*/SBP_SEG_MAX,
				/*flags*/BUS_DMA_ALLOCNOW,
				/*lockfunc*/busdma_lock_mutex,
				/*lockarg*/&sbp->mtx,
				&sbp->dmat);
	if (error != 0) {
		printf("sbp_attach: Could not allocate DMA tag "
			"- error %d\n", error);
			return (ENOMEM);
	}

	devq = cam_simq_alloc(/*maxopenings*/SBP_NUM_OCB);
	if (devq == NULL)
		return (ENXIO);

	for (i = 0; i < SBP_NUM_TARGETS; i++) {
		sbp->targets[i].fwdev = NULL;
		sbp->targets[i].luns = NULL;
		sbp->targets[i].sbp = sbp;
	}

	sbp->sim = cam_sim_alloc(sbp_action, sbp_poll, "sbp", sbp,
				 device_get_unit(dev),
				 &sbp->mtx,
				 /*untagged*/ 1,
				 /*tagged*/ SBP_QUEUE_LEN - 1,
				 devq);

	if (sbp->sim == NULL) {
		cam_simq_free(devq);
		return (ENXIO);
	}

	SBP_LOCK(sbp);
	if (xpt_bus_register(sbp->sim, dev, /*bus*/0) != CAM_SUCCESS)
		goto fail;

	if (xpt_create_path(&sbp->path, NULL, cam_sim_path(sbp->sim),
	    CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
		xpt_bus_deregister(cam_sim_path(sbp->sim));
		goto fail;
	}
	SBP_UNLOCK(sbp);

	/* We reserve 16 bit space (4 bytes X 64 targets X 256 luns) */
	sbp->fwb.start = ((u_int64_t)SBP_BIND_HI << 32) | SBP_DEV2ADDR(0, 0);
	sbp->fwb.end = sbp->fwb.start + 0xffff;
	/* pre-allocate xfer */
	STAILQ_INIT(&sbp->fwb.xferlist);
	fw_xferlist_add(&sbp->fwb.xferlist, M_SBP,
	    /*send*/ 0, /*recv*/ SBP_RECV_LEN, SBP_NUM_OCB/2,
	    fc, (void *)sbp, sbp_recv);

	fw_bindadd(fc, &sbp->fwb);

	sbp->fd.post_busreset = sbp_post_busreset;
	sbp->fd.post_explore = sbp_post_explore;

	if (fc->status != -1) {
		sbp_post_busreset(sbp);
		sbp_post_explore(sbp);
	}
	SBP_LOCK(sbp);
	xpt_async(AC_BUS_RESET, sbp->path, /*arg*/ NULL);
	SBP_UNLOCK(sbp);

	return (0);
fail:
	SBP_UNLOCK(sbp);
	cam_sim_free(sbp->sim, /*free_devq*/TRUE);
	return (ENXIO);
}

static int
sbp_logout_all(struct sbp_softc *sbp)
{
	struct sbp_target *target;
	struct sbp_dev *sdev;
	int i, j;

SBP_DEBUG(0)
	printf("sbp_logout_all\n");
END_DEBUG
	SBP_LOCK_ASSERT(sbp);
	for (i = 0; i < SBP_NUM_TARGETS; i++) {
		target = &sbp->targets[i];
		if (target->luns == NULL)
			continue;
		for (j = 0; j < target->num_lun; j++) {
			sdev = target->luns[j];
			if (sdev == NULL)
				continue;
			callout_stop(&sdev->login_callout);
			if (sdev->status >= SBP_DEV_TOATTACH &&
					sdev->status <= SBP_DEV_ATTACHED)
				sbp_mgm_orb(sdev, ORB_FUN_LGO, NULL);
		}
	}

	return 0;
}

static int
sbp_shutdown(device_t dev)
{
	struct sbp_softc *sbp = ((struct sbp_softc *)device_get_softc(dev));

	SBP_LOCK(sbp);
	sbp_logout_all(sbp);
	SBP_UNLOCK(sbp);
	return (0);
}

static void
sbp_free_sdev(struct sbp_dev *sdev)
{
	struct sbp_softc *sbp;
	int i;

	if (sdev == NULL)
		return;
	sbp = sdev->target->sbp;
	SBP_UNLOCK(sbp);
	callout_drain(&sdev->login_callout);
	for (i = 0; i < SBP_QUEUE_LEN; i++) {
		callout_drain(&sdev->ocb[i].timer);
		bus_dmamap_destroy(sbp->dmat, sdev->ocb[i].dmamap);
	}
	fwdma_free(sbp->fd.fc, &sdev->dma);
	free(sdev, M_SBP);
	SBP_LOCK(sbp);
}

static void
sbp_free_target(struct sbp_target *target)
{
	struct sbp_softc *sbp;
	struct fw_xfer *xfer, *next;
	int i;

	if (target->luns == NULL)
		return;
	sbp = target->sbp;
	SBP_LOCK_ASSERT(sbp);
	SBP_UNLOCK(sbp);
	callout_drain(&target->mgm_ocb_timeout);
	callout_drain(&target->scan_callout);
	SBP_LOCK(sbp);
	for (i = 0; i < target->num_lun; i++)
		sbp_free_sdev(target->luns[i]);

	STAILQ_FOREACH_SAFE(xfer, &target->xferlist, link, next) {
		fw_xfer_free_buf(xfer);
	}
	STAILQ_INIT(&target->xferlist);
	free(target->luns, M_SBP);
	target->num_lun = 0;
	target->luns = NULL;
	target->fwdev = NULL;
}

static int
sbp_detach(device_t dev)
{
	struct sbp_softc *sbp = ((struct sbp_softc *)device_get_softc(dev));
	struct firewire_comm *fc = sbp->fd.fc;
	int i;

SBP_DEBUG(0)
	printf("sbp_detach\n");
END_DEBUG

	SBP_LOCK(sbp);
	for (i = 0; i < SBP_NUM_TARGETS; i++)
		sbp_cam_detach_target(&sbp->targets[i]);

	xpt_async(AC_LOST_DEVICE, sbp->path, NULL);
	xpt_free_path(sbp->path);
	xpt_bus_deregister(cam_sim_path(sbp->sim));
	cam_sim_free(sbp->sim, /*free_devq*/ TRUE);

	sbp_logout_all(sbp);
	SBP_UNLOCK(sbp);

	/* XXX wait for logout completion */
	pause("sbpdtc", hz/2);

	SBP_LOCK(sbp);
	for (i = 0; i < SBP_NUM_TARGETS; i++)
		sbp_free_target(&sbp->targets[i]);
	SBP_UNLOCK(sbp);

	fw_bindremove(fc, &sbp->fwb);
	fw_xferlist_remove(&sbp->fwb.xferlist);

	bus_dma_tag_destroy(sbp->dmat);
	mtx_destroy(&sbp->mtx);

	return (0);
}

static void
sbp_cam_detach_sdev(struct sbp_dev *sdev)
{
	if (sdev == NULL)
		return;
	if (sdev->status == SBP_DEV_DEAD)
		return;
	if (sdev->status == SBP_DEV_RESET)
		return;
	SBP_LOCK_ASSERT(sdev->target->sbp);
	sbp_abort_all_ocbs(sdev, CAM_DEV_NOT_THERE);
	if (sdev->path) {
		xpt_release_devq(sdev->path,
				 sdev->freeze, TRUE);
		sdev->freeze = 0;
		xpt_async(AC_LOST_DEVICE, sdev->path, NULL);
		xpt_free_path(sdev->path);
		sdev->path = NULL;
	}
}

static void
sbp_cam_detach_target(struct sbp_target *target)
{
	int i;

	SBP_LOCK_ASSERT(target->sbp);
	if (target->luns != NULL) {
SBP_DEBUG(0)
		printf("sbp_detach_target %d\n", target->target_id);
END_DEBUG
		callout_stop(&target->scan_callout);
		for (i = 0; i < target->num_lun; i++)
			sbp_cam_detach_sdev(target->luns[i]);
	}
}

static void
sbp_target_reset(struct sbp_dev *sdev, int method)
{
	int i;
	struct sbp_target *target = sdev->target;
	struct sbp_dev *tsdev;

	SBP_LOCK_ASSERT(target->sbp);
	for (i = 0; i < target->num_lun; i++) {
		tsdev = target->luns[i];
		if (tsdev == NULL)
			continue;
		if (tsdev->status == SBP_DEV_DEAD)
			continue;
		if (tsdev->status == SBP_DEV_RESET)
			continue;
		xpt_freeze_devq(tsdev->path, 1);
		tsdev->freeze++;
		sbp_abort_all_ocbs(tsdev, CAM_CMD_TIMEOUT);
		if (method == 2)
			tsdev->status = SBP_DEV_LOGIN;
	}
	switch (method) {
	case 1:
		printf("target reset\n");
		sbp_mgm_orb(sdev, ORB_FUN_RST, NULL);
		break;
	case 2:
		printf("reset start\n");
		sbp_reset_start(sdev);
		break;
	}

}

static void
sbp_mgm_timeout(void *arg)
{
	struct sbp_ocb *ocb = (struct sbp_ocb *)arg;
	struct sbp_dev *sdev = ocb->sdev;
	struct sbp_target *target = sdev->target;

	SBP_LOCK_ASSERT(target->sbp);
	device_printf(sdev->target->sbp->fd.dev,
		"%s:%s request timeout(mgm orb:0x%08x)\n",
		__func__, sdev->bustgtlun, (uint32_t)ocb->bus_addr);
	target->mgm_ocb_cur = NULL;
	sbp_free_ocb(sdev, ocb);
#if 0
	/* XXX */
	printf("run next request\n");
	sbp_mgm_orb(sdev, ORB_FUN_RUNQUEUE, NULL);
#endif
	device_printf(sdev->target->sbp->fd.dev,
		"%s:%s reset start\n",
		__func__, sdev->bustgtlun);
	sbp_reset_start(sdev);
}

static void
sbp_timeout(void *arg)
{
	struct sbp_ocb *ocb = (struct sbp_ocb *)arg;
	struct sbp_dev *sdev = ocb->sdev;

	device_printf(sdev->target->sbp->fd.dev,
		"%s:%s request timeout(cmd orb:0x%08x) ... ",
		__func__, sdev->bustgtlun, (uint32_t)ocb->bus_addr);

	SBP_LOCK_ASSERT(sdev->target->sbp);
	sdev->timeout++;
	switch (sdev->timeout) {
	case 1:
		printf("agent reset\n");
		xpt_freeze_devq(sdev->path, 1);
		sdev->freeze++;
		sbp_abort_all_ocbs(sdev, CAM_CMD_TIMEOUT);
		sbp_agent_reset(sdev);
		break;
	case 2:
	case 3:
		sbp_target_reset(sdev, sdev->timeout - 1);
		break;
#if 0
	default:
		/* XXX give up */
		sbp_cam_detach_target(target);
		if (target->luns != NULL)
			free(target->luns, M_SBP);
		target->num_lun = 0;
		target->luns = NULL;
		target->fwdev = NULL;
#endif
	}
}

static void
sbp_action(struct cam_sim *sim, union ccb *ccb)
{

	struct sbp_softc *sbp = (struct sbp_softc *)sim->softc;
	struct sbp_target *target = NULL;
	struct sbp_dev *sdev = NULL;

	if (sbp != NULL)
		SBP_LOCK_ASSERT(sbp);
	/* target:lun -> sdev mapping */
	if (sbp != NULL
			&& ccb->ccb_h.target_id != CAM_TARGET_WILDCARD
			&& ccb->ccb_h.target_id < SBP_NUM_TARGETS) {
		target = &sbp->targets[ccb->ccb_h.target_id];
		if (target->fwdev != NULL
				&& ccb->ccb_h.target_lun != CAM_LUN_WILDCARD
				&& ccb->ccb_h.target_lun < target->num_lun) {
			sdev = target->luns[ccb->ccb_h.target_lun];
			if (sdev != NULL && sdev->status != SBP_DEV_ATTACHED &&
				sdev->status != SBP_DEV_PROBE)
				sdev = NULL;
		}
	}

SBP_DEBUG(1)
	if (sdev == NULL)
		printf("invalid target %d lun %jx\n",
			ccb->ccb_h.target_id, (uintmax_t)ccb->ccb_h.target_lun);
END_DEBUG

	switch (ccb->ccb_h.func_code) {
	case XPT_SCSI_IO:
	case XPT_RESET_DEV:
	case XPT_GET_TRAN_SETTINGS:
	case XPT_SET_TRAN_SETTINGS:
	case XPT_CALC_GEOMETRY:
		if (sdev == NULL) {
SBP_DEBUG(1)
			printf("%s:%d:%jx:func_code 0x%04x: "
				"Invalid target (target needed)\n",
				device_get_nameunit(sbp->fd.dev),
				ccb->ccb_h.target_id,
				(uintmax_t)ccb->ccb_h.target_lun,
				ccb->ccb_h.func_code);
END_DEBUG

			ccb->ccb_h.status = CAM_DEV_NOT_THERE;
			xpt_done(ccb);
			return;
		}
		break;
	case XPT_PATH_INQ:
	case XPT_NOOP:
		/* The opcodes sometimes aimed at a target (sc is valid),
		 * sometimes aimed at the SIM (sc is invalid and target is
		 * CAM_TARGET_WILDCARD)
		 */
		if (sbp == NULL &&
			ccb->ccb_h.target_id != CAM_TARGET_WILDCARD) {
SBP_DEBUG(0)
			printf("%s:%d:%jx func_code 0x%04x: "
				"Invalid target (no wildcard)\n",
				device_get_nameunit(sbp->fd.dev),
				ccb->ccb_h.target_id,
				(uintmax_t)ccb->ccb_h.target_lun,
				ccb->ccb_h.func_code);
END_DEBUG
			ccb->ccb_h.status = CAM_DEV_NOT_THERE;
			xpt_done(ccb);
			return;
		}
		break;
	default:
		/* XXX Hm, we should check the input parameters */
		break;
	}

	switch (ccb->ccb_h.func_code) {
	case XPT_SCSI_IO:
	{
		struct ccb_scsiio *csio;
		struct sbp_ocb *ocb;
		int speed;
		void *cdb;

		csio = &ccb->csio;
		mtx_assert(sim->mtx, MA_OWNED);

SBP_DEBUG(2)
		printf("%s:%d:%jx XPT_SCSI_IO: "
			"cmd: %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x"
			", flags: 0x%02x, "
			"%db cmd/%db data/%db sense\n",
			device_get_nameunit(sbp->fd.dev),
			ccb->ccb_h.target_id, (uintmax_t)ccb->ccb_h.target_lun,
			csio->cdb_io.cdb_bytes[0],
			csio->cdb_io.cdb_bytes[1],
			csio->cdb_io.cdb_bytes[2],
			csio->cdb_io.cdb_bytes[3],
			csio->cdb_io.cdb_bytes[4],
			csio->cdb_io.cdb_bytes[5],
			csio->cdb_io.cdb_bytes[6],
			csio->cdb_io.cdb_bytes[7],
			csio->cdb_io.cdb_bytes[8],
			csio->cdb_io.cdb_bytes[9],
			ccb->ccb_h.flags & CAM_DIR_MASK,
			csio->cdb_len, csio->dxfer_len,
			csio->sense_len);
END_DEBUG
		if (sdev == NULL) {
			ccb->ccb_h.status = CAM_DEV_NOT_THERE;
			xpt_done(ccb);
			return;
		}
		if (csio->cdb_len > sizeof(ocb->orb) - 5 * sizeof(uint32_t)) {
			ccb->ccb_h.status = CAM_REQ_INVALID;
			xpt_done(ccb);
			return;
		}
#if 0
		/* if we are in probe stage, pass only probe commands */
		if (sdev->status == SBP_DEV_PROBE) {
			char *name;
			name = xpt_path_periph(ccb->ccb_h.path)->periph_name;
			printf("probe stage, periph name: %s\n", name);
			if (strcmp(name, "probe") != 0) {
				ccb->ccb_h.status = CAM_REQUEUE_REQ;
				xpt_done(ccb);
				return;
			}
		}
#endif
		if ((ocb = sbp_get_ocb(sdev)) == NULL) {
			ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
			if (sdev->freeze == 0) {
				xpt_freeze_devq(sdev->path, 1);
				sdev->freeze++;
			}
			xpt_done(ccb);
			return;
		}

		ocb->flags = OCB_ACT_CMD;
		ocb->sdev = sdev;
		ocb->ccb = ccb;
		ccb->ccb_h.ccb_sdev_ptr = sdev;
		ocb->orb[0] = htonl(1U << 31);
		ocb->orb[1] = 0;
		ocb->orb[2] = htonl(((sbp->fd.fc->nodeid | FWLOCALBUS) << 16));
		ocb->orb[3] = htonl(ocb->bus_addr + IND_PTR_OFFSET);
		speed = min(target->fwdev->speed, max_speed);
		ocb->orb[4] = htonl(ORB_NOTIFY | ORB_CMD_SPD(speed)
						| ORB_CMD_MAXP(speed + 7));
		if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) {
			ocb->orb[4] |= htonl(ORB_CMD_IN);
		}

		if (csio->ccb_h.flags & CAM_CDB_POINTER)
			cdb = (void *)csio->cdb_io.cdb_ptr;
		else
			cdb = (void *)&csio->cdb_io.cdb_bytes;
		bcopy(cdb, (void *)&ocb->orb[5], csio->cdb_len);
/*
printf("ORB %08x %08x %08x %08x\n", ntohl(ocb->orb[0]), ntohl(ocb->orb[1]), ntohl(ocb->orb[2]), ntohl(ocb->orb[3]));
printf("ORB %08x %08x %08x %08x\n", ntohl(ocb->orb[4]), ntohl(ocb->orb[5]), ntohl(ocb->orb[6]), ntohl(ocb->orb[7]));
*/
		if (ccb->csio.dxfer_len > 0) {
			int error;

			error = bus_dmamap_load_ccb(/*dma tag*/sbp->dmat,
					/*dma map*/ocb->dmamap,
					ccb,
					sbp_execute_ocb,
					ocb,
					/*flags*/0);
			if (error)
				printf("sbp: bus_dmamap_load error %d\n", error);
		} else
			sbp_execute_ocb(ocb, NULL, 0, 0);
		break;
	}
	case XPT_CALC_GEOMETRY:
	{
		struct ccb_calc_geometry *ccg;

		ccg = &ccb->ccg;
		if (ccg->block_size == 0) {
			printf("sbp_action: block_size is 0.\n");
			ccb->ccb_h.status = CAM_REQ_INVALID;
			xpt_done(ccb);
			break;
		}
SBP_DEBUG(1)
		printf("%s:%d:%d:%jx:XPT_CALC_GEOMETRY: "
			"Volume size = %jd\n",
			device_get_nameunit(sbp->fd.dev),
			cam_sim_path(sbp->sim),
			ccb->ccb_h.target_id, (uintmax_t)ccb->ccb_h.target_lun,
			(uintmax_t)ccg->volume_size);
END_DEBUG

		cam_calc_geometry(ccg, /*extended*/1);
		xpt_done(ccb);
		break;
	}
	case XPT_RESET_BUS:		/* Reset the specified SCSI bus */
	{

SBP_DEBUG(1)
		printf("%s:%d:XPT_RESET_BUS: \n",
			device_get_nameunit(sbp->fd.dev), cam_sim_path(sbp->sim));
END_DEBUG

		ccb->ccb_h.status = CAM_REQ_INVALID;
		xpt_done(ccb);
		break;
	}
	case XPT_PATH_INQ:		/* Path routing inquiry */
	{
		struct ccb_pathinq *cpi = &ccb->cpi;

SBP_DEBUG(1)
		printf("%s:%d:%jx XPT_PATH_INQ:.\n",
			device_get_nameunit(sbp->fd.dev),
			ccb->ccb_h.target_id, (uintmax_t)ccb->ccb_h.target_lun);
END_DEBUG
		cpi->version_num = 1; /* XXX??? */
		cpi->hba_inquiry = PI_TAG_ABLE;
		cpi->target_sprt = 0;
		cpi->hba_misc = PIM_NOBUSRESET | PIM_NO_6_BYTE;
		cpi->hba_eng_cnt = 0;
		cpi->max_target = SBP_NUM_TARGETS - 1;
		cpi->max_lun = SBP_NUM_LUNS - 1;
		cpi->initiator_id = SBP_INITIATOR;
		cpi->bus_id = sim->bus_id;
		cpi->base_transfer_speed = 400 * 1000 / 8;
		strlcpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
		strlcpy(cpi->hba_vid, "SBP", HBA_IDLEN);
		strlcpy(cpi->dev_name, sim->sim_name, DEV_IDLEN);
		cpi->unit_number = sim->unit_number;
		cpi->transport = XPORT_SPI;	/* XX should have a FireWire */
		cpi->transport_version = 2;
		cpi->protocol = PROTO_SCSI;
		cpi->protocol_version = SCSI_REV_2;

		cpi->ccb_h.status = CAM_REQ_CMP;
		xpt_done(ccb);
		break;
	}
	case XPT_GET_TRAN_SETTINGS:
	{
		struct ccb_trans_settings *cts = &ccb->cts;
		struct ccb_trans_settings_scsi *scsi =
		    &cts->proto_specific.scsi;
		struct ccb_trans_settings_spi *spi =
		    &cts->xport_specific.spi;

		cts->protocol = PROTO_SCSI;
		cts->protocol_version = SCSI_REV_2;
		cts->transport = XPORT_SPI;	/* should have a FireWire */
		cts->transport_version = 2;
		spi->valid = CTS_SPI_VALID_DISC;
		spi->flags = CTS_SPI_FLAGS_DISC_ENB;
		scsi->valid = CTS_SCSI_VALID_TQ;
		scsi->flags = CTS_SCSI_FLAGS_TAG_ENB;
SBP_DEBUG(1)
		printf("%s:%d:%jx XPT_GET_TRAN_SETTINGS:.\n",
			device_get_nameunit(sbp->fd.dev),
			ccb->ccb_h.target_id, (uintmax_t)ccb->ccb_h.target_lun);
END_DEBUG
		cts->ccb_h.status = CAM_REQ_CMP;
		xpt_done(ccb);
		break;
	}
	case XPT_ABORT:
		ccb->ccb_h.status = CAM_UA_ABORT;
		xpt_done(ccb);
		break;
	case XPT_SET_TRAN_SETTINGS:
		/* XXX */
	default:
		ccb->ccb_h.status = CAM_REQ_INVALID;
		xpt_done(ccb);
		break;
	}
	return;
}

static void
sbp_execute_ocb(void *arg, bus_dma_segment_t *segments, int seg, int error)
{
	int i;
	struct sbp_ocb *ocb;
	struct sbp_ocb *prev;
	bus_dma_segment_t *s;

	if (error)
		printf("sbp_execute_ocb: error=%d\n", error);

	ocb = (struct sbp_ocb *)arg;

SBP_DEBUG(2)
	printf("sbp_execute_ocb: seg %d", seg);
	for (i = 0; i < seg; i++)
		printf(", %jx:%jd", (uintmax_t)segments[i].ds_addr,
					(uintmax_t)segments[i].ds_len);
	printf("\n");
END_DEBUG

	if (seg == 1) {
		/* direct pointer */
		s = &segments[0];
		if (s->ds_len > SBP_SEG_MAX)
			panic("ds_len > SBP_SEG_MAX, fix busdma code");
		ocb->orb[3] = htonl(s->ds_addr);
		ocb->orb[4] |= htonl(s->ds_len);
	} else if (seg > 1) {
		/* page table */
		for (i = 0; i < seg; i++) {
			s = &segments[i];
SBP_DEBUG(0)
			/* XXX LSI Logic "< 16 byte" bug might be hit */
			if (s->ds_len < 16)
				printf("sbp_execute_ocb: warning, "
					"segment length(%zd) is less than 16."
					"(seg=%d/%d)\n", (size_t)s->ds_len, i + 1, seg);
END_DEBUG
			if (s->ds_len > SBP_SEG_MAX)
				panic("ds_len > SBP_SEG_MAX, fix busdma code");
			ocb->ind_ptr[i].hi = htonl(s->ds_len << 16);
			ocb->ind_ptr[i].lo = htonl(s->ds_addr);
		}
		ocb->orb[4] |= htonl(ORB_CMD_PTBL | seg);
	}

	if (seg > 0)
		bus_dmamap_sync(ocb->sdev->target->sbp->dmat, ocb->dmamap,
			(ntohl(ocb->orb[4]) & ORB_CMD_IN) ?
			BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE);
	prev = sbp_enqueue_ocb(ocb->sdev, ocb);
	fwdma_sync(&ocb->sdev->dma, BUS_DMASYNC_PREWRITE);
	if (use_doorbell) {
		if (prev == NULL) {
			if (ocb->sdev->last_ocb != NULL)
				sbp_doorbell(ocb->sdev);
			else
				sbp_orb_pointer(ocb->sdev, ocb);
		}
	} else {
		if (prev == NULL || (ocb->sdev->flags & ORB_LINK_DEAD) != 0) {
			ocb->sdev->flags &= ~ORB_LINK_DEAD;
			sbp_orb_pointer(ocb->sdev, ocb);
		}
	}
}

static void
sbp_poll(struct cam_sim *sim)
{
	struct sbp_softc *sbp;
	struct firewire_comm *fc;

	sbp = (struct sbp_softc *)sim->softc;
	fc = sbp->fd.fc;

	fc->poll(fc, 0, -1);

	return;
}

static struct sbp_ocb *
sbp_dequeue_ocb(struct sbp_dev *sdev, struct sbp_status *sbp_status)
{
	struct sbp_ocb *ocb;
	struct sbp_ocb *next;
	int order = 0;

SBP_DEBUG(1)
	device_printf(sdev->target->sbp->fd.dev,
	"%s:%s 0x%08x src %d\n",
	    __func__, sdev->bustgtlun, ntohl(sbp_status->orb_lo), sbp_status->src);
END_DEBUG
	SBP_LOCK_ASSERT(sdev->target->sbp);
	STAILQ_FOREACH_SAFE(ocb, &sdev->ocbs, ocb, next) {
		if (OCB_MATCH(ocb, sbp_status)) {
			/* found */
			STAILQ_REMOVE(&sdev->ocbs, ocb, sbp_ocb, ocb);
			if (ocb->ccb != NULL)
				callout_stop(&ocb->timer);
			if (ntohl(ocb->orb[4]) & 0xffff) {
				bus_dmamap_sync(sdev->target->sbp->dmat,
					ocb->dmamap,
					(ntohl(ocb->orb[4]) & ORB_CMD_IN) ?
					BUS_DMASYNC_POSTREAD :
					BUS_DMASYNC_POSTWRITE);
				bus_dmamap_unload(sdev->target->sbp->dmat,
					ocb->dmamap);
			}
			if (!use_doorbell) {
				if (sbp_status->src == SRC_NO_NEXT) {
					if (next != NULL)
						sbp_orb_pointer(sdev, next);
					else if (order > 0) {
						/*
						 * Unordered execution
						 * We need to send pointer for
						 * next ORB
						 */
						sdev->flags |= ORB_LINK_DEAD;
					}
				}
			} else {
				/*
				 * XXX this is not correct for unordered
				 * execution.
				 */
				if (sdev->last_ocb != NULL) {
					sbp_free_ocb(sdev, sdev->last_ocb);
				}
				sdev->last_ocb = ocb;
				if (next != NULL &&
				    sbp_status->src == SRC_NO_NEXT)
					sbp_doorbell(sdev);
			}
			break;
		} else
			order++;
	}
SBP_DEBUG(0)
	if (ocb && order > 0) {
		device_printf(sdev->target->sbp->fd.dev,
			"%s:%s unordered execution order:%d\n",
			__func__, sdev->bustgtlun, order);
	}
END_DEBUG
	return (ocb);
}

static struct sbp_ocb *
sbp_enqueue_ocb(struct sbp_dev *sdev, struct sbp_ocb *ocb)
{
	struct sbp_ocb *prev, *prev2;

	SBP_LOCK_ASSERT(sdev->target->sbp);
SBP_DEBUG(1)
	device_printf(sdev->target->sbp->fd.dev,
	"%s:%s 0x%08jx\n", __func__, sdev->bustgtlun, (uintmax_t)ocb->bus_addr);
END_DEBUG
	prev2 = prev = STAILQ_LAST(&sdev->ocbs, sbp_ocb, ocb);
	STAILQ_INSERT_TAIL(&sdev->ocbs, ocb, ocb);

	if (ocb->ccb != NULL) {
		callout_reset_sbt(&ocb->timer,
		    SBT_1MS * ocb->ccb->ccb_h.timeout, 0, sbp_timeout,
		    ocb, 0);
	}

	if (use_doorbell && prev == NULL)
		prev2 = sdev->last_ocb;

	if (prev2 != NULL && (ocb->sdev->flags & ORB_LINK_DEAD) == 0) {
SBP_DEBUG(1)
		printf("linking chain 0x%jx -> 0x%jx\n",
		    (uintmax_t)prev2->bus_addr, (uintmax_t)ocb->bus_addr);
END_DEBUG
		/*
		 * Suppress compiler optimization so that orb[1] must be written first.
		 * XXX We may need an explicit memory barrier for other architectures
		 * other than i386/amd64.
		 */
		*(volatile uint32_t *)&prev2->orb[1] = htonl(ocb->bus_addr);
		*(volatile uint32_t *)&prev2->orb[0] = 0;
	}

	return prev;
}

static struct sbp_ocb *
sbp_get_ocb(struct sbp_dev *sdev)
{
	struct sbp_ocb *ocb;

	SBP_LOCK_ASSERT(sdev->target->sbp);
	ocb = STAILQ_FIRST(&sdev->free_ocbs);
	if (ocb == NULL) {
		sdev->flags |= ORB_SHORTAGE;
		printf("ocb shortage!!!\n");
		return NULL;
	}
	STAILQ_REMOVE_HEAD(&sdev->free_ocbs, ocb);
	ocb->ccb = NULL;
	return (ocb);
}

static void
sbp_free_ocb(struct sbp_dev *sdev, struct sbp_ocb *ocb)
{
	ocb->flags = 0;
	ocb->ccb = NULL;

	SBP_LOCK_ASSERT(sdev->target->sbp);
	STAILQ_INSERT_TAIL(&sdev->free_ocbs, ocb, ocb);
	if ((sdev->flags & ORB_SHORTAGE) != 0) {
		int count;

		sdev->flags &= ~ORB_SHORTAGE;
		count = sdev->freeze;
		sdev->freeze = 0;
		xpt_release_devq(sdev->path, count, TRUE);
	}
}

static void
sbp_abort_ocb(struct sbp_ocb *ocb, int status)
{
	struct sbp_dev *sdev;

	sdev = ocb->sdev;
	SBP_LOCK_ASSERT(sdev->target->sbp);
SBP_DEBUG(0)
	device_printf(sdev->target->sbp->fd.dev,
	"%s:%s 0x%jx\n", __func__, sdev->bustgtlun, (uintmax_t)ocb->bus_addr);
END_DEBUG
SBP_DEBUG(1)
	if (ocb->ccb != NULL)
		sbp_print_scsi_cmd(ocb);
END_DEBUG
	if (ntohl(ocb->orb[4]) & 0xffff) {
		bus_dmamap_sync(sdev->target->sbp->dmat, ocb->dmamap,
			(ntohl(ocb->orb[4]) & ORB_CMD_IN) ?
			BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
		bus_dmamap_unload(sdev->target->sbp->dmat, ocb->dmamap);
	}
	if (ocb->ccb != NULL) {
		callout_stop(&ocb->timer);
		ocb->ccb->ccb_h.status = status;
		xpt_done(ocb->ccb);
	}
	sbp_free_ocb(sdev, ocb);
}

static void
sbp_abort_all_ocbs(struct sbp_dev *sdev, int status)
{
	struct sbp_ocb *ocb, *next;
	STAILQ_HEAD(, sbp_ocb) temp;

	STAILQ_INIT(&temp);
	SBP_LOCK_ASSERT(sdev->target->sbp);
	STAILQ_CONCAT(&temp, &sdev->ocbs);
	STAILQ_INIT(&sdev->ocbs);

	STAILQ_FOREACH_SAFE(ocb, &temp, ocb, next) {
		sbp_abort_ocb(ocb, status);
	}
	if (sdev->last_ocb != NULL) {
		sbp_free_ocb(sdev, sdev->last_ocb);
		sdev->last_ocb = NULL;
	}
}

static devclass_t sbp_devclass;

static device_method_t sbp_methods[] = {
	/* device interface */
	DEVMETHOD(device_identify,	sbp_identify),
	DEVMETHOD(device_probe,		sbp_probe),
	DEVMETHOD(device_attach,	sbp_attach),
	DEVMETHOD(device_detach,	sbp_detach),
	DEVMETHOD(device_shutdown,	sbp_shutdown),

	{ 0, 0 }
};

static driver_t sbp_driver = {
	"sbp",
	sbp_methods,
	sizeof(struct sbp_softc),
};
DRIVER_MODULE(sbp, firewire, sbp_driver, sbp_devclass, 0, 0);
MODULE_VERSION(sbp, 1);
MODULE_DEPEND(sbp, firewire, 1, 1, 1);
MODULE_DEPEND(sbp, cam, 1, 1, 1);