Merge branch 'vendor/OPENSSL'

[dragonfly.git] / sys / dev / raid / mps / mps_sas.c

/*-
 * Copyright (c) 2009 Yahoo! Inc.
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
/*-
 * Copyright (c) 2011 LSI Corp.
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * LSI MPT-Fusion Host Adapter FreeBSD
 *
 * $FreeBSD: src/sys/dev/mps/mps_sas.c,v 1.16 2012/01/26 18:17:21 ken Exp $
 */

/* Communications core for LSI MPT2 */

/* TODO Move headers to mpsvar */
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/eventhandler.h>
#include <sys/globaldata.h>
#include <sys/bio.h>
#include <sys/malloc.h>
#include <sys/uio.h>
#include <sys/sysctl.h>
#include <sys/endian.h>
#include <sys/queue.h>
#include <sys/kthread.h>
#include <sys/taskqueue.h>
#include <sys/sbuf.h>

#include <sys/rman.h>

#include <machine/stdarg.h>

#include <bus/cam/cam.h>
#include <bus/cam/cam_ccb.h>
#include <bus/cam/cam_xpt.h>
#include <bus/cam/cam_debug.h>
#include <bus/cam/cam_sim.h>
#include <bus/cam/cam_xpt_sim.h>
#include <bus/cam/cam_xpt_periph.h>
#include <bus/cam/cam_periph.h>
#include <bus/cam/scsi/scsi_all.h>
#include <bus/cam/scsi/scsi_message.h>
#if 0 /* XXX __FreeBSD_version >= 900026 */
#include <bus/cam/scsi/smp_all.h>
#endif

#include <dev/raid/mps/mpi/mpi2_type.h>
#include <dev/raid/mps/mpi/mpi2.h>
#include <dev/raid/mps/mpi/mpi2_ioc.h>
#include <dev/raid/mps/mpi/mpi2_sas.h>
#include <dev/raid/mps/mpi/mpi2_cnfg.h>
#include <dev/raid/mps/mpi/mpi2_init.h>
#include <dev/raid/mps/mpi/mpi2_tool.h>
#include <dev/raid/mps/mps_ioctl.h>
#include <dev/raid/mps/mpsvar.h>
#include <dev/raid/mps/mps_table.h>
#include <dev/raid/mps/mps_sas.h>

#define MPSSAS_DISCOVERY_TIMEOUT        20
#define MPSSAS_MAX_DISCOVERY_TIMEOUTS   10 /* 200 seconds */

/*
 * static array to check SCSI OpCode for EEDP protection bits
 */
#define PRO_R MPI2_SCSIIO_EEDPFLAGS_CHECK_REMOVE_OP
#define PRO_W MPI2_SCSIIO_EEDPFLAGS_INSERT_OP
#define PRO_V MPI2_SCSIIO_EEDPFLAGS_INSERT_OP
static uint8_t op_code_prot[256] = {
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, PRO_R, 0, PRO_W, 0, 0, 0, PRO_W, PRO_V,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, PRO_W, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, PRO_R, 0, PRO_W, 0, 0, 0, PRO_W, PRO_V,
        0, 0, 0, PRO_W, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, PRO_R, 0, PRO_W, 0, 0, 0, PRO_W, PRO_V,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};

MALLOC_DEFINE(M_MPSSAS, "MPSSAS", "MPS SAS memory");

static struct mpssas_target * mpssas_find_target_by_handle(struct mpssas_softc *, int, uint16_t);
static void mpssas_log_command(struct mps_command *, const char *, ...)
                __printflike(2, 3);
#if 0 /* XXX unused */
static void mpssas_discovery_timeout(void *data);
#endif
static void mpssas_remove_device(struct mps_softc *, struct mps_command *);
static void mpssas_remove_complete(struct mps_softc *, struct mps_command *);
static void mpssas_action(struct cam_sim *sim, union ccb *ccb);
static void mpssas_poll(struct cam_sim *sim);
static void mpssas_scsiio_timeout(void *data);
static void mpssas_abort_complete(struct mps_softc *sc, struct mps_command *cm);
static void mpssas_direct_drive_io(struct mpssas_softc *sassc,
    struct mps_command *cm, union ccb *ccb);
static void mpssas_action_scsiio(struct mpssas_softc *, union ccb *);
static void mpssas_scsiio_complete(struct mps_softc *, struct mps_command *);
static void mpssas_action_resetdev(struct mpssas_softc *, union ccb *);
#if __FreeBSD_version >= 900026
static void mpssas_smpio_complete(struct mps_softc *sc, struct mps_command *cm);
static void mpssas_send_smpcmd(struct mpssas_softc *sassc, union ccb *ccb,
                               uint64_t sasaddr);
static void mpssas_action_smpio(struct mpssas_softc *sassc, union ccb *ccb);
#endif //FreeBSD_version >= 900026
static void mpssas_resetdev_complete(struct mps_softc *, struct mps_command *);
static int  mpssas_send_abort(struct mps_softc *sc, struct mps_command *tm, struct mps_command *cm);
static int  mpssas_send_reset(struct mps_softc *sc, struct mps_command *tm, uint8_t type);
static void mpssas_rescan(struct mpssas_softc *sassc, union ccb *ccb);
static void mpssas_rescan_done(struct cam_periph *periph, union ccb *done_ccb);
static void mpssas_scanner_thread(void *arg);
#if __FreeBSD_version >= 1000006
static void mpssas_async(void *callback_arg, uint32_t code,
                         struct cam_path *path, void *arg);
#else
static void mpssas_check_eedp(struct mpssas_softc *sassc);
static void mpssas_read_cap_done(struct cam_periph *periph, union ccb *done_ccb);
#endif
static int mpssas_send_portenable(struct mps_softc *sc);
static void mpssas_portenable_complete(struct mps_softc *sc,
    struct mps_command *cm);

static struct mpssas_target *
mpssas_find_target_by_handle(struct mpssas_softc *sassc, int start, uint16_t handle)
{
        struct mpssas_target *target;
        int i;

        for (i = start; i < sassc->sc->facts->MaxTargets; i++) {
                target = &sassc->targets[i];
                if (target->handle == handle)
                        return (target);
        }

        return (NULL);
}

/* we need to freeze the simq during attach and diag reset, to avoid failing
 * commands before device handles have been found by discovery.  Since
 * discovery involves reading config pages and possibly sending commands,
 * discovery actions may continue even after we receive the end of discovery
 * event, so refcount discovery actions instead of assuming we can unfreeze
 * the simq when we get the event.
 */
void
mpssas_startup_increment(struct mpssas_softc *sassc)
{
        if ((sassc->flags & MPSSAS_IN_STARTUP) != 0) {
                if (sassc->startup_refcount++ == 0) {
                        /* just starting, freeze the simq */
                        mps_dprint(sassc->sc, MPS_INFO,
                            "%s freezing simq\n", __func__);
                        xpt_freeze_simq(sassc->sim, 1);
                }
                mps_dprint(sassc->sc, MPS_TRACE, "%s refcount %u\n", __func__,
                    sassc->startup_refcount);
        }
}

void
mpssas_startup_decrement(struct mpssas_softc *sassc)
{
        if ((sassc->flags & MPSSAS_IN_STARTUP) != 0) {
                if (--sassc->startup_refcount == 0) {
                        /* finished all discovery-related actions, release
                         * the simq and rescan for the latest topology.
                         */
                        mps_dprint(sassc->sc, MPS_INFO,
                            "%s releasing simq\n", __func__);
                        sassc->flags &= ~MPSSAS_IN_STARTUP;
                        xpt_release_simq(sassc->sim, 1);
                        mpssas_rescan_target(sassc->sc, NULL);
                }
                mps_dprint(sassc->sc, MPS_TRACE, "%s refcount %u\n", __func__,
                    sassc->startup_refcount);
        }
}

/* LSI's firmware requires us to stop sending commands when we're doing task
 * management, so refcount the TMs and keep the simq frozen when any are in
 * use.
 */
struct mps_command *
mpssas_alloc_tm(struct mps_softc *sc)
{
        struct mps_command *tm;

        tm = mps_alloc_high_priority_command(sc);
        if (tm != NULL) {
                if (sc->sassc->tm_count++ == 0) {
                        mps_printf(sc, "%s freezing simq\n", __func__);
                        xpt_freeze_simq(sc->sassc->sim, 1);
                }
                mps_dprint(sc, MPS_TRACE, "%s tm_count %u\n", __func__,
                    sc->sassc->tm_count);
        }
        return tm;
}

void
mpssas_free_tm(struct mps_softc *sc, struct mps_command *tm)
{
        if (tm == NULL)
                return;

        /* if there are no TMs in use, we can release the simq.  We use our
         * own refcount so that it's easier for a diag reset to cleanup and
         * release the simq.
         */
        if (--sc->sassc->tm_count == 0) {
                mps_printf(sc, "%s releasing simq\n", __func__);
                xpt_release_simq(sc->sassc->sim, 1);
        }
        mps_dprint(sc, MPS_TRACE, "%s tm_count %u\n", __func__,
            sc->sassc->tm_count);

        mps_free_high_priority_command(sc, tm);
}


void
mpssas_rescan_target(struct mps_softc *sc, struct mpssas_target *targ)
{
        struct mpssas_softc *sassc = sc->sassc;
        path_id_t pathid;
        target_id_t targetid;
        union ccb *ccb;

        pathid = cam_sim_path(sassc->sim);
        if (targ == NULL)
                targetid = CAM_TARGET_WILDCARD;
        else
                targetid = targ - sassc->targets;

        /*
         * Allocate a CCB and schedule a rescan.
         */
        ccb = kmalloc(sizeof(union ccb), M_TEMP, M_WAITOK | M_ZERO);

        if (xpt_create_path(&ccb->ccb_h.path, xpt_periph, pathid,
                            targetid, CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
                mps_dprint(sc, MPS_FAULT, "unable to create path for rescan\n");
                xpt_free_ccb(ccb);
                return;
        }

        /* XXX Hardwired to scan the bus for now */
        ccb->ccb_h.func_code = XPT_SCAN_BUS;
        mps_dprint(sc, MPS_TRACE, "%s targetid %u\n", __func__, targetid);
        mpssas_rescan(sassc, ccb);
}

static void
mpssas_log_command(struct mps_command *cm, const char *fmt, ...)
{
        struct sbuf sb;
        __va_list ap;
        char str[192];
        char path_str[64];

        if (cm == NULL)
                return;

        sbuf_new(&sb, str, sizeof(str), 0);

        __va_start(ap, fmt);

        if (cm->cm_ccb != NULL) {
                xpt_path_string(cm->cm_ccb->csio.ccb_h.path, path_str,
                                sizeof(path_str));
                sbuf_cat(&sb, path_str);
                if (cm->cm_ccb->ccb_h.func_code == XPT_SCSI_IO) {
                        scsi_command_string(&cm->cm_ccb->csio, &sb);
                        sbuf_printf(&sb, "length %d ",
                                    cm->cm_ccb->csio.dxfer_len);
                }
        }
        else {
                sbuf_printf(&sb, "(noperiph:%s%d:%u:%u:%u): ",
                    cam_sim_name(cm->cm_sc->sassc->sim),
                    cam_sim_unit(cm->cm_sc->sassc->sim),
                    cam_sim_bus(cm->cm_sc->sassc->sim),
                    cm->cm_targ ? cm->cm_targ->tid : 0xFFFFFFFF,
                    cm->cm_lun);
        }

        sbuf_printf(&sb, "SMID %u ", cm->cm_desc.Default.SMID);
        sbuf_vprintf(&sb, fmt, ap);
        sbuf_finish(&sb);
        kprintf("%s", sbuf_data(&sb));

        __va_end(ap);
}

static void
mpssas_lost_target(struct mps_softc *sc, struct mpssas_target *targ)
{
        struct mpssas_softc *sassc = sc->sassc;
        path_id_t pathid = cam_sim_path(sassc->sim);
        struct cam_path *path;

        mps_printf(sc, "%s targetid %u\n", __func__, targ->tid);
        if (xpt_create_path(&path, NULL, pathid, targ->tid, 0) != CAM_REQ_CMP) {
                mps_printf(sc, "unable to create path for lost target %d\n",
                    targ->tid);
                return;
        }

        xpt_async(AC_LOST_DEVICE, path, NULL);
        xpt_free_path(path);
}

/*
 * The MPT2 firmware performs debounce on the link to avoid transient link
 * errors and false removals.  When it does decide that link has been lost
 * and a device need to go away, it expects that the host will perform a
 * target reset and then an op remove.  The reset has the side-effect of
 * aborting any outstanding requests for the device, which is required for
 * the op-remove to succeed.  It's not clear if the host should check for
 * the device coming back alive after the reset.
 */
void
mpssas_prepare_remove(struct mpssas_softc *sassc, uint16_t handle)
{
        MPI2_SCSI_TASK_MANAGE_REQUEST *req;
        struct mps_softc *sc;
        struct mps_command *cm;
        struct mpssas_target *targ = NULL;

        mps_dprint(sassc->sc, MPS_TRACE, "%s\n", __func__);

        /*
         * If this is a WD controller, determine if the disk should be exposed
         * to the OS or not.  If disk should be exposed, return from this
         * function without doing anything.
         */
        sc = sassc->sc;
        if ((sc->mps_flags & MPS_FLAGS_WD_AVAILABLE) && (sc->WD_hide_expose ==
            MPS_WD_EXPOSE_ALWAYS)) {
                return;
        }

        targ = mpssas_find_target_by_handle(sassc, 0, handle);
        if (targ == NULL) {
                /* FIXME: what is the action? */
                /* We don't know about this device? */
                kprintf("%s: invalid handle 0x%x \n", __func__, handle);
                return;
        }

        targ->flags |= MPSSAS_TARGET_INREMOVAL;

        cm = mpssas_alloc_tm(sc);
        if (cm == NULL) {
                mps_printf(sc, "%s: command alloc failure\n", __func__);
                return;
        }

        mpssas_lost_target(sc, targ);

        req = (MPI2_SCSI_TASK_MANAGE_REQUEST *)cm->cm_req;
        memset(req, 0, sizeof(*req));
        req->DevHandle = targ->handle;
        req->Function = MPI2_FUNCTION_SCSI_TASK_MGMT;
        req->TaskType = MPI2_SCSITASKMGMT_TASKTYPE_TARGET_RESET;

        /* SAS Hard Link Reset / SATA Link Reset */
        req->MsgFlags = MPI2_SCSITASKMGMT_MSGFLAGS_LINK_RESET;

        cm->cm_targ = targ;
        cm->cm_data = NULL;
        cm->cm_desc.HighPriority.RequestFlags = MPI2_REQ_DESCRIPT_FLAGS_HIGH_PRIORITY;
        cm->cm_complete = mpssas_remove_device;
        cm->cm_complete_data = (void *)(uintptr_t)handle;
        mps_map_command(sc, cm);
}

static void
mpssas_remove_device(struct mps_softc *sc, struct mps_command *tm)
{
        MPI2_SCSI_TASK_MANAGE_REPLY *reply;
        MPI2_SAS_IOUNIT_CONTROL_REQUEST *req;
        struct mpssas_target *targ;
        struct mps_command *next_cm;
        uint16_t handle;

        mps_dprint(sc, MPS_TRACE, "%s\n", __func__);

        reply = (MPI2_SCSI_TASK_MANAGE_REPLY *)tm->cm_reply;
        handle = (uint16_t)(uintptr_t)tm->cm_complete_data;
        targ = tm->cm_targ;

        /*
         * Currently there should be no way we can hit this case.  It only
         * happens when we have a failure to allocate chain frames, and
         * task management commands don't have S/G lists.
         */
        if ((tm->cm_flags & MPS_CM_FLAGS_ERROR_MASK) != 0) {
                mps_printf(sc, "%s: cm_flags = %#x for remove of handle %#04x! "
                           "This should not happen!\n", __func__, tm->cm_flags,
                           handle);
                mpssas_free_tm(sc, tm);
                return;
        }

        if (reply == NULL) {
                /* XXX retry the remove after the diag reset completes? */
                mps_printf(sc, "%s NULL reply reseting device 0x%04x\n",
                    __func__, handle);
                mpssas_free_tm(sc, tm);
                return;
        }

        if (reply->IOCStatus != MPI2_IOCSTATUS_SUCCESS) {
                mps_printf(sc, "IOCStatus = 0x%x while resetting device 0x%x\n",
                   reply->IOCStatus, handle);
                mpssas_free_tm(sc, tm);
                return;
        }

        mps_dprint(sc, MPS_INFO, "Reset aborted %u commands\n",
            reply->TerminationCount);
        mps_free_reply(sc, tm->cm_reply_data);
        tm->cm_reply = NULL;    /* Ensures the the reply won't get re-freed */

        /* Reuse the existing command */
        req = (MPI2_SAS_IOUNIT_CONTROL_REQUEST *)tm->cm_req;
        memset(req, 0, sizeof(*req));
        req->Function = MPI2_FUNCTION_SAS_IO_UNIT_CONTROL;
        req->Operation = MPI2_SAS_OP_REMOVE_DEVICE;
        req->DevHandle = handle;
        tm->cm_data = NULL;
        tm->cm_desc.Default.RequestFlags = MPI2_REQ_DESCRIPT_FLAGS_DEFAULT_TYPE;
        tm->cm_complete = mpssas_remove_complete;
        tm->cm_complete_data = (void *)(uintptr_t)handle;

        mps_map_command(sc, tm);

        mps_dprint(sc, MPS_INFO, "clearing target %u handle 0x%04x\n",
                   targ->tid, handle);
        TAILQ_FOREACH_MUTABLE(tm, &targ->commands, cm_link, next_cm) {
                union ccb *ccb;

                mps_dprint(sc, MPS_INFO, "Completing missed command %p\n", tm);
                ccb = tm->cm_complete_data;
                ccb->ccb_h.status = CAM_DEV_NOT_THERE;
                mpssas_scsiio_complete(sc, tm);
        }
}

static void
mpssas_remove_complete(struct mps_softc *sc, struct mps_command *tm)
{
        MPI2_SAS_IOUNIT_CONTROL_REPLY *reply;
        uint16_t handle;
        struct mpssas_target *targ;

        mps_dprint(sc, MPS_TRACE, "%s\n", __func__);

        reply = (MPI2_SAS_IOUNIT_CONTROL_REPLY *)tm->cm_reply;
        handle = (uint16_t)(uintptr_t)tm->cm_complete_data;

        /*
         * Currently there should be no way we can hit this case.  It only
         * happens when we have a failure to allocate chain frames, and
         * task management commands don't have S/G lists.
         */
        if ((tm->cm_flags & MPS_CM_FLAGS_ERROR_MASK) != 0) {
                mps_printf(sc, "%s: cm_flags = %#x for remove of handle %#04x! "
                           "This should not happen!\n", __func__, tm->cm_flags,
                           handle);
                mpssas_free_tm(sc, tm);
                return;
        }

        if (reply == NULL) {
                /* most likely a chip reset */
                mps_printf(sc, "%s NULL reply removing device 0x%04x\n",
                    __func__, handle);
                mpssas_free_tm(sc, tm);
                return;
        }

        mps_printf(sc, "%s on handle 0x%04x, IOCStatus= 0x%x\n", __func__,
            handle, reply->IOCStatus);

        /*
         * Don't clear target if remove fails because things will get confusing.
         * Leave the devname and sasaddr intact so that we know to avoid reusing
         * this target id if possible, and so we can assign the same target id
         * to this device if it comes back in the future.
         */
        if (reply->IOCStatus == MPI2_IOCSTATUS_SUCCESS) {
                targ = tm->cm_targ;
                targ->handle = 0x0;
                targ->encl_handle = 0x0;
                targ->encl_slot = 0x0;
                targ->exp_dev_handle = 0x0;
                targ->phy_num = 0x0;
                targ->linkrate = 0x0;
                targ->devinfo = 0x0;
        }

        mpssas_free_tm(sc, tm);
}

static int
mpssas_register_events(struct mps_softc *sc)
{
        uint8_t events[16];

        bzero(events, 16);
        setbit(events, MPI2_EVENT_SAS_DEVICE_STATUS_CHANGE);
        setbit(events, MPI2_EVENT_SAS_DISCOVERY);
        setbit(events, MPI2_EVENT_SAS_BROADCAST_PRIMITIVE);
        setbit(events, MPI2_EVENT_SAS_INIT_DEVICE_STATUS_CHANGE);
        setbit(events, MPI2_EVENT_SAS_INIT_TABLE_OVERFLOW);
        setbit(events, MPI2_EVENT_SAS_TOPOLOGY_CHANGE_LIST);
        setbit(events, MPI2_EVENT_SAS_ENCL_DEVICE_STATUS_CHANGE);
        setbit(events, MPI2_EVENT_IR_CONFIGURATION_CHANGE_LIST);
        setbit(events, MPI2_EVENT_IR_VOLUME);
        setbit(events, MPI2_EVENT_IR_PHYSICAL_DISK);
        setbit(events, MPI2_EVENT_IR_OPERATION_STATUS);
        setbit(events, MPI2_EVENT_LOG_ENTRY_ADDED);

        mps_register_events(sc, events, mpssas_evt_handler, NULL,
            &sc->sassc->mpssas_eh);

        return (0);
}

int
mps_attach_sas(struct mps_softc *sc)
{
        struct mpssas_softc *sassc;
#if __FreeBSD_version >= 1000006
        cam_status status;
#endif
        int unit, error = 0;

        mps_dprint(sc, MPS_TRACE, "%s\n", __func__);

        sassc = kmalloc(sizeof(struct mpssas_softc), M_MPT2, M_WAITOK|M_ZERO);
        sassc->targets = kmalloc(sizeof(struct mpssas_target) *
            sc->facts->MaxTargets, M_MPT2, M_WAITOK|M_ZERO);
        sc->sassc = sassc;
        sassc->sc = sc;

        if ((sassc->devq = cam_simq_alloc(sc->num_reqs)) == NULL) {
                mps_dprint(sc, MPS_FAULT, "Cannot allocate SIMQ\n");
                error = ENOMEM;
                goto out;
        }

        unit = device_get_unit(sc->mps_dev);
        sassc->sim = cam_sim_alloc(mpssas_action, mpssas_poll, "mps", sassc,
            unit, &sc->mps_lock, sc->num_reqs, sc->num_reqs, sassc->devq);
        cam_simq_release(sassc->devq);
        if (sassc->sim == NULL) {
                mps_dprint(sc, MPS_FAULT, "Cannot allocate SIM\n");
                error = EINVAL;
                goto out;
        }

        TAILQ_INIT(&sassc->ev_queue);

        /* Initialize taskqueue for Event Handling */
        TASK_INIT(&sassc->ev_task, 0, mpssas_firmware_event_work, sc);
        sassc->ev_tq = taskqueue_create("mps_taskq", M_NOWAIT | M_ZERO,
            taskqueue_thread_enqueue, &sassc->ev_tq);

        /* Run the task queue with lowest priority */
        taskqueue_start_threads(&sassc->ev_tq, 1, 255, -1, "%s taskq",
            device_get_nameunit(sc->mps_dev));

        TAILQ_INIT(&sassc->ccb_scanq);
        error = mps_kproc_create(mpssas_scanner_thread, sassc,
            &sassc->rescan_thread, 0, 0, "mps_scan%d", unit);
        if (error) {
                mps_printf(sc, "Error %d starting rescan thread\n", error);
                goto out;
        }

        mps_lock(sc);
        sassc->flags |= MPSSAS_SCANTHREAD;

        /*
         * XXX There should be a bus for every port on the adapter, but since
         * we're just going to fake the topology for now, we'll pretend that
         * everything is just a target on a single bus.
         */
        if ((error = xpt_bus_register(sassc->sim, 0)) != 0) {
                mps_dprint(sc, MPS_FAULT, "Error %d registering SCSI bus\n",
                    error);
                mps_unlock(sc);
                goto out;
        }

        /*
         * Assume that discovery events will start right away.  Freezing
         * the simq will prevent the CAM boottime scanner from running
         * before discovery is complete.
         */
        sassc->flags |= MPSSAS_IN_STARTUP | MPSSAS_IN_DISCOVERY;
        xpt_freeze_simq(sassc->sim, 1);
        sc->sassc->startup_refcount = 0;

        callout_init_mp(&sassc->discovery_callout);
        sassc->discovery_timeouts = 0;

        sassc->tm_count = 0;

#if __FreeBSD_version >= 1000006
        status = xpt_register_async(AC_ADVINFO_CHANGED, mpssas_async, sc, NULL);
        if (status != CAM_REQ_CMP) {
                mps_printf(sc, "Error %#x registering async handler for "
                           "AC_ADVINFO_CHANGED events\n", status);
        }
#endif

        mps_unlock(sc);

        mpssas_register_events(sc);
out:
        if (error)
                mps_detach_sas(sc);
        return (error);
}

int
mps_detach_sas(struct mps_softc *sc)
{
        struct mpssas_softc *sassc;

        mps_dprint(sc, MPS_TRACE, "%s\n", __func__);

        if (sc->sassc == NULL)
                return (0);

        sassc = sc->sassc;
        mps_deregister_events(sc, sassc->mpssas_eh);

        /*
         * Drain and free the event handling taskqueue with the lock
         * unheld so that any parallel processing tasks drain properly
         * without deadlocking.
         */
        if (sassc->ev_tq != NULL)
                taskqueue_free(sassc->ev_tq);

        /* Make sure CAM doesn't wedge if we had to bail out early. */
        mps_lock(sc);

        /* Deregister our async handler */
#if __FreeBSD_version >= 1000006
        xpt_register_async(0, mpssas_async, sc, NULL);
#endif

        if (sassc->flags & MPSSAS_IN_STARTUP)
                xpt_release_simq(sassc->sim, 1);

        if (sassc->sim != NULL) {
                xpt_bus_deregister(cam_sim_path(sassc->sim));
                cam_sim_free(sassc->sim);
        }

        if (sassc->flags & MPSSAS_SCANTHREAD) {
                sassc->flags |= MPSSAS_SHUTDOWN;
                wakeup(&sassc->ccb_scanq);

                if (sassc->flags & MPSSAS_SCANTHREAD) {
                        lksleep(&sassc->flags, &sc->mps_lock, 0,
                               "mps_shutdown", 30 * hz);
                }
        }
        mps_unlock(sc);

        kfree(sassc->targets, M_MPT2);
        kfree(sassc, M_MPT2);
        sc->sassc = NULL;

        return (0);
}

void
mpssas_discovery_end(struct mpssas_softc *sassc)
{
        struct mps_softc *sc = sassc->sc;

        mps_dprint(sc, MPS_TRACE, "%s\n", __func__);

        if (sassc->flags & MPSSAS_DISCOVERY_TIMEOUT_PENDING)
                callout_stop(&sassc->discovery_callout);

}

#if 0 /* XXX unused */
static void
mpssas_discovery_timeout(void *data)
{
        struct mpssas_softc *sassc = data;
        struct mps_softc *sc;

        sc = sassc->sc;
        mps_dprint(sc, MPS_TRACE, "%s\n", __func__);

        mps_lock(sc);
        mps_printf(sc,
            "Timeout waiting for discovery, interrupts may not be working!\n");
        sassc->flags &= ~MPSSAS_DISCOVERY_TIMEOUT_PENDING;

        /* Poll the hardware for events in case interrupts aren't working */
        mps_intr_locked(sc);

        mps_printf(sassc->sc,
            "Finished polling after discovery timeout at %d\n", ticks);

        if ((sassc->flags & MPSSAS_IN_DISCOVERY) == 0) {
                mpssas_discovery_end(sassc);
        } else {
                if (sassc->discovery_timeouts < MPSSAS_MAX_DISCOVERY_TIMEOUTS) {
                        sassc->flags |= MPSSAS_DISCOVERY_TIMEOUT_PENDING;
                        callout_reset(&sassc->discovery_callout,
                            MPSSAS_DISCOVERY_TIMEOUT * hz,
                            mpssas_discovery_timeout, sassc);
                        sassc->discovery_timeouts++;
                } else {
                        mps_dprint(sassc->sc, MPS_FAULT,
                            "Discovery timed out, continuing.\n");
                        sassc->flags &= ~MPSSAS_IN_DISCOVERY;
                        mpssas_discovery_end(sassc);
                }
        }

        mps_unlock(sc);
}
#endif

static void
mpssas_action(struct cam_sim *sim, union ccb *ccb)
{
        struct mpssas_softc *sassc;

        sassc = cam_sim_softc(sim);

        mps_dprint(sassc->sc, MPS_TRACE, "%s func 0x%x\n", __func__,
            ccb->ccb_h.func_code);
        KKASSERT(lockstatus(&sassc->sc->mps_lock, curthread) != 0);

        switch (ccb->ccb_h.func_code) {
        case XPT_PATH_INQ:
        {
                struct ccb_pathinq *cpi = &ccb->cpi;

                cpi->version_num = 1;
                cpi->hba_inquiry = PI_SDTR_ABLE|PI_TAG_ABLE|PI_WIDE_16;
                cpi->target_sprt = 0;
                cpi->hba_misc = PIM_NOBUSRESET;
                cpi->hba_eng_cnt = 0;
                cpi->max_target = sassc->sc->facts->MaxTargets - 1;
                cpi->max_lun = 0;
                cpi->initiator_id = 255;
                strncpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
                strncpy(cpi->hba_vid, "LSILogic", HBA_IDLEN);
                strncpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN);
                cpi->unit_number = cam_sim_unit(sim);
                cpi->bus_id = cam_sim_bus(sim);
                cpi->base_transfer_speed = 150000;
                cpi->transport = XPORT_SAS;
                cpi->transport_version = 0;
                cpi->protocol = PROTO_SCSI;
                cpi->protocol_version = SCSI_REV_SPC;
#if __FreeBSD_version >= 800001
                /*
                 * XXX KDM where does this number come from?
                 */
                cpi->maxio = 256 * 1024;
#endif
                cpi->ccb_h.status = CAM_REQ_CMP;
                break;
        }
        case XPT_GET_TRAN_SETTINGS:
        {
                struct ccb_trans_settings       *cts;
                struct ccb_trans_settings_sas   *sas;
                struct ccb_trans_settings_scsi  *scsi;
                struct mpssas_target *targ;

                cts = &ccb->cts;
                sas = &cts->xport_specific.sas;
                scsi = &cts->proto_specific.scsi;

                targ = &sassc->targets[cts->ccb_h.target_id];
                if (targ->handle == 0x0) {
                        cts->ccb_h.status = CAM_TID_INVALID;
                        break;
                }

                cts->protocol_version = SCSI_REV_SPC2;
                cts->transport = XPORT_SAS;
                cts->transport_version = 0;

                sas->valid = CTS_SAS_VALID_SPEED;
                switch (targ->linkrate) {
                case 0x08:
                        sas->bitrate = 150000;
                        break;
                case 0x09:
                        sas->bitrate = 300000;
                        break;
                case 0x0a:
                        sas->bitrate = 600000;
                        break;
                default:
                        sas->valid = 0;
                }

                cts->protocol = PROTO_SCSI;
                scsi->valid = CTS_SCSI_VALID_TQ;
                scsi->flags = CTS_SCSI_FLAGS_TAG_ENB;

                cts->ccb_h.status = CAM_REQ_CMP;
                break;
        }
        case XPT_CALC_GEOMETRY:
                cam_calc_geometry(&ccb->ccg, /*extended*/1);
                ccb->ccb_h.status = CAM_REQ_CMP;
                break;
        case XPT_RESET_DEV:
                mps_printf(sassc->sc, "mpssas_action XPT_RESET_DEV\n");
                mpssas_action_resetdev(sassc, ccb);
                return;
        case XPT_RESET_BUS:
        case XPT_ABORT:
        case XPT_TERM_IO:
                mps_printf(sassc->sc, "mpssas_action faking success for "
                           "abort or reset\n");
                ccb->ccb_h.status = CAM_REQ_CMP;
                break;
        case XPT_SCSI_IO:
                mpssas_action_scsiio(sassc, ccb);
                return;
#if __FreeBSD_version >= 900026
        case XPT_SMP_IO:
                mpssas_action_smpio(sassc, ccb);
                return;
#endif
        default:
                ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
                break;
        }
        xpt_done(ccb);

}

static void
mpssas_announce_reset(struct mps_softc *sc, uint32_t ac_code,
    target_id_t target_id, lun_id_t lun_id)
{
        path_id_t path_id = cam_sim_path(sc->sassc->sim);
        struct cam_path *path;

        mps_printf(sc, "%s code %x target %d lun %d\n", __func__,
            ac_code, target_id, lun_id);

        if (xpt_create_path(&path, NULL,
                path_id, target_id, lun_id) != CAM_REQ_CMP) {
                mps_printf(sc, "unable to create path for reset "
                           "notification\n");
                return;
        }

        xpt_async(ac_code, path, NULL);
        xpt_free_path(path);
}

static void
mpssas_complete_all_commands(struct mps_softc *sc)
{
        struct mps_command *cm;
        int i;
        int completed;

        mps_printf(sc, "%s\n", __func__);
        KKASSERT(lockstatus(&sc->mps_lock, curthread) != 0);

        /* complete all commands with a NULL reply */
        for (i = 1; i < sc->num_reqs; i++) {
                cm = &sc->commands[i];
                cm->cm_reply = NULL;
                completed = 0;

                if (cm->cm_flags & MPS_CM_FLAGS_POLLED)
                        cm->cm_flags |= MPS_CM_FLAGS_COMPLETE;

                if (cm->cm_complete != NULL) {
                        mpssas_log_command(cm,
                            "completing cm %p state %x ccb %p for diag reset\n",
                            cm, cm->cm_state, cm->cm_ccb);

                        cm->cm_complete(sc, cm);
                        completed = 1;
                }

                if (cm->cm_flags & MPS_CM_FLAGS_WAKEUP) {
                        mpssas_log_command(cm,
                            "waking up cm %p state %x ccb %p for diag reset\n",
                            cm, cm->cm_state, cm->cm_ccb);
                        wakeup(cm);
                        completed = 1;
                }

                if ((completed == 0) && (cm->cm_state != MPS_CM_STATE_FREE)) {
                        /* this should never happen, but if it does, log */
                        mpssas_log_command(cm,
                            "cm %p state %x flags 0x%x ccb %p during diag "
                            "reset\n", cm, cm->cm_state, cm->cm_flags,
                            cm->cm_ccb);
                }
        }
}

void
mpssas_handle_reinit(struct mps_softc *sc)
{
        int i;

        /* Go back into startup mode and freeze the simq, so that CAM
         * doesn't send any commands until after we've rediscovered all
         * targets and found the proper device handles for them.
         *
         * After the reset, portenable will trigger discovery, and after all
         * discovery-related activities have finished, the simq will be
         * released.
         */
        mps_printf(sc, "%s startup\n", __func__);
        sc->sassc->flags |= MPSSAS_IN_STARTUP;
        sc->sassc->flags |= MPSSAS_IN_DISCOVERY;
        xpt_freeze_simq(sc->sassc->sim, 1);

        /* notify CAM of a bus reset */
        mpssas_announce_reset(sc, AC_BUS_RESET, CAM_TARGET_WILDCARD,
            CAM_LUN_WILDCARD);

        /* complete and cleanup after all outstanding commands */
        mpssas_complete_all_commands(sc);

        mps_printf(sc, "%s startup %u tm %u after command completion\n",
            __func__, sc->sassc->startup_refcount, sc->sassc->tm_count);

        /*
         * The simq was explicitly frozen above, so set the refcount to 0.
         * The simq will be explicitly released after port enable completes.
         */
        sc->sassc->startup_refcount = 0;

        /* zero all the target handles, since they may change after the
         * reset, and we have to rediscover all the targets and use the new
         * handles.
         */
        for (i = 0; i < sc->facts->MaxTargets; i++) {
                if (sc->sassc->targets[i].outstanding != 0)
                        mps_printf(sc, "target %u outstanding %u\n",
                            i, sc->sassc->targets[i].outstanding);
                sc->sassc->targets[i].handle = 0x0;
                sc->sassc->targets[i].exp_dev_handle = 0x0;
                sc->sassc->targets[i].outstanding = 0;
                sc->sassc->targets[i].flags = MPSSAS_TARGET_INDIAGRESET;
        }
}
static void
mpssas_tm_timeout(void *data)
{
        struct mps_command *tm = data;
        struct mps_softc *sc = tm->cm_sc;

        mps_lock(sc);
        mpssas_log_command(tm, "task mgmt %p timed out\n", tm);
        mps_reinit(sc);
        mps_unlock(sc);
}

static void
mpssas_logical_unit_reset_complete(struct mps_softc *sc, struct mps_command *tm)
{
        MPI2_SCSI_TASK_MANAGE_REPLY *reply;
        unsigned int cm_count = 0;
        struct mps_command *cm;
        struct mpssas_target *targ;

        callout_stop(&tm->cm_callout);

        reply = (MPI2_SCSI_TASK_MANAGE_REPLY *)tm->cm_reply;
        targ = tm->cm_targ;

        /*
         * Currently there should be no way we can hit this case.  It only
         * happens when we have a failure to allocate chain frames, and
         * task management commands don't have S/G lists.
         */
        if ((tm->cm_flags & MPS_CM_FLAGS_ERROR_MASK) != 0) {
                mps_printf(sc, "%s: cm_flags = %#x for LUN reset! "
                           "This should not happen!\n", __func__, tm->cm_flags);
                mpssas_free_tm(sc, tm);
                return;
        }

        if (reply == NULL) {
                mpssas_log_command(tm, "NULL reset reply for tm %p\n", tm);
                if ((sc->mps_flags & MPS_FLAGS_DIAGRESET) != 0) {
                        /* this completion was due to a reset, just cleanup */
                        targ->flags &= ~MPSSAS_TARGET_INRESET;
                        targ->tm = NULL;
                        mpssas_free_tm(sc, tm);
                }
                else {
                        /* we should have gotten a reply. */
                        mps_reinit(sc);
                }
                return;
        }

        mpssas_log_command(tm,
            "logical unit reset status 0x%x code 0x%x count %u\n",
            reply->IOCStatus, reply->ResponseCode,
            reply->TerminationCount);

        /* See if there are any outstanding commands for this LUN.
         * This could be made more efficient by using a per-LU data
         * structure of some sort.
         */
        TAILQ_FOREACH(cm, &targ->commands, cm_link) {
                if (cm->cm_lun == tm->cm_lun)
                        cm_count++;
        }

        if (cm_count == 0) {
                mpssas_log_command(tm,
                    "logical unit %u finished recovery after reset\n",
                    tm->cm_lun);

                mpssas_announce_reset(sc, AC_SENT_BDR, tm->cm_targ->tid,
                    tm->cm_lun);

                /* we've finished recovery for this logical unit.  check and
                 * see if some other logical unit has a timedout command
                 * that needs to be processed.
                 */
                cm = TAILQ_FIRST(&targ->timedout_commands);
                if (cm) {
                        mpssas_send_abort(sc, tm, cm);
                }
                else {
                        targ->tm = NULL;
                        mpssas_free_tm(sc, tm);
                }
        }
        else {
                /* if we still have commands for this LUN, the reset
                 * effectively failed, regardless of the status reported.
                 * Escalate to a target reset.
                 */
                mpssas_log_command(tm,
                    "logical unit reset complete for tm %p, but still have %u command(s)\n",
                    tm, cm_count);
                mpssas_send_reset(sc, tm,
                    MPI2_SCSITASKMGMT_TASKTYPE_TARGET_RESET);
        }
}

static void
mpssas_target_reset_complete(struct mps_softc *sc, struct mps_command *tm)
{
        MPI2_SCSI_TASK_MANAGE_REPLY *reply;
        struct mpssas_target *targ;

        callout_stop(&tm->cm_callout);

        reply = (MPI2_SCSI_TASK_MANAGE_REPLY *)tm->cm_reply;
        targ = tm->cm_targ;

        /*
         * Currently there should be no way we can hit this case.  It only
         * happens when we have a failure to allocate chain frames, and
         * task management commands don't have S/G lists.
         */
        if ((tm->cm_flags & MPS_CM_FLAGS_ERROR_MASK) != 0) {
                mps_printf(sc, "%s: cm_flags = %#x for target reset! "
                           "This should not happen!\n", __func__, tm->cm_flags);
                mpssas_free_tm(sc, tm);
                return;
        }

        if (reply == NULL) {
                mpssas_log_command(tm, "NULL reset reply for tm %p\n", tm);
                if ((sc->mps_flags & MPS_FLAGS_DIAGRESET) != 0) {
                        /* this completion was due to a reset, just cleanup */
                        targ->flags &= ~MPSSAS_TARGET_INRESET;
                        targ->tm = NULL;
                        mpssas_free_tm(sc, tm);
                }
                else {
                        /* we should have gotten a reply. */
                        mps_reinit(sc);
                }
                return;
        }

        mpssas_log_command(tm,
            "target reset status 0x%x code 0x%x count %u\n",
            reply->IOCStatus, reply->ResponseCode,
            reply->TerminationCount);

        targ->flags &= ~MPSSAS_TARGET_INRESET;

        if (targ->outstanding == 0) {
                /* we've finished recovery for this target and all
                 * of its logical units.
                 */
                mpssas_log_command(tm,
                    "recovery finished after target reset\n");

                mpssas_announce_reset(sc, AC_SENT_BDR, tm->cm_targ->tid,
                    CAM_LUN_WILDCARD);

                targ->tm = NULL;
                mpssas_free_tm(sc, tm);
        }
        else {
                /* after a target reset, if this target still has
                 * outstanding commands, the reset effectively failed,
                 * regardless of the status reported.  escalate.
                 */
                mpssas_log_command(tm,
                    "target reset complete for tm %p, but still have %u command(s)\n",
                    tm, targ->outstanding);
                mps_reinit(sc);
        }
}

#define MPS_RESET_TIMEOUT 30

static int
mpssas_send_reset(struct mps_softc *sc, struct mps_command *tm, uint8_t type)
{
        MPI2_SCSI_TASK_MANAGE_REQUEST *req;
        struct mpssas_target *target;
        int err;

        target = tm->cm_targ;
        if (target->handle == 0) {
                mps_printf(sc, "%s null devhandle for target_id %d\n",
                    __func__, target->tid);
                return -1;
        }

        req = (MPI2_SCSI_TASK_MANAGE_REQUEST *)tm->cm_req;
        req->DevHandle = target->handle;
        req->Function = MPI2_FUNCTION_SCSI_TASK_MGMT;
        req->TaskType = type;

        if (type == MPI2_SCSITASKMGMT_TASKTYPE_LOGICAL_UNIT_RESET) {
                /* XXX Need to handle invalid LUNs */
                MPS_SET_LUN(req->LUN, tm->cm_lun);
                tm->cm_targ->logical_unit_resets++;
                mpssas_log_command(tm, "sending logical unit reset\n");
                tm->cm_complete = mpssas_logical_unit_reset_complete;
        }
        else if (type == MPI2_SCSITASKMGMT_TASKTYPE_TARGET_RESET) {
                /* Target reset method =  SAS Hard Link Reset / SATA Link Reset */
                req->MsgFlags = MPI2_SCSITASKMGMT_MSGFLAGS_LINK_RESET;
                tm->cm_targ->target_resets++;
                tm->cm_targ->flags |= MPSSAS_TARGET_INRESET;
                mpssas_log_command(tm, "sending target reset\n");
                tm->cm_complete = mpssas_target_reset_complete;
        }
        else {
                mps_printf(sc, "unexpected reset type 0x%x\n", type);
                return -1;
        }

        tm->cm_data = NULL;
        tm->cm_desc.HighPriority.RequestFlags = MPI2_REQ_DESCRIPT_FLAGS_HIGH_PRIORITY;
        tm->cm_complete_data = (void *)tm;

        callout_reset(&tm->cm_callout, MPS_RESET_TIMEOUT * hz,
            mpssas_tm_timeout, tm);

        err = mps_map_command(sc, tm);
        if (err)
                mpssas_log_command(tm,
                    "error %d sending reset type %u\n",
                    err, type);

        return err;
}


static void
mpssas_abort_complete(struct mps_softc *sc, struct mps_command *tm)
{
        struct mps_command *cm;
        MPI2_SCSI_TASK_MANAGE_REPLY *reply;
        MPI2_SCSI_TASK_MANAGE_REQUEST *req;
        struct mpssas_target *targ;

        callout_stop(&tm->cm_callout);

        req = (MPI2_SCSI_TASK_MANAGE_REQUEST *)tm->cm_req;
        reply = (MPI2_SCSI_TASK_MANAGE_REPLY *)tm->cm_reply;
        targ = tm->cm_targ;

        /*
         * Currently there should be no way we can hit this case.  It only
         * happens when we have a failure to allocate chain frames, and
         * task management commands don't have S/G lists.
         */
        if ((tm->cm_flags & MPS_CM_FLAGS_ERROR_MASK) != 0) {
                mpssas_log_command(tm,
                    "cm_flags = %#x for abort %p TaskMID %u!\n",
                    tm->cm_flags, tm, req->TaskMID);
                mpssas_free_tm(sc, tm);
                return;
        }

        if (reply == NULL) {
                mpssas_log_command(tm,
                    "NULL abort reply for tm %p TaskMID %u\n",
                    tm, req->TaskMID);
                if ((sc->mps_flags & MPS_FLAGS_DIAGRESET) != 0) {
                        /* this completion was due to a reset, just cleanup */
                        targ->tm = NULL;
                        mpssas_free_tm(sc, tm);
                }
                else {
                        /* we should have gotten a reply. */
                        mps_reinit(sc);
                }
                return;
        }

        mpssas_log_command(tm,
            "abort TaskMID %u status 0x%x code 0x%x count %u\n",
            req->TaskMID,
            reply->IOCStatus, reply->ResponseCode,
            reply->TerminationCount);

        cm = TAILQ_FIRST(&tm->cm_targ->timedout_commands);
        if (cm == NULL) {
                /* if there are no more timedout commands, we're done with
                 * error recovery for this target.
                 */
                mpssas_log_command(tm,
                    "finished recovery after aborting TaskMID %u\n",
                    req->TaskMID);

                targ->tm = NULL;
                mpssas_free_tm(sc, tm);
        }
        else if (req->TaskMID != cm->cm_desc.Default.SMID) {
                /* abort success, but we have more timedout commands to abort */
                mpssas_log_command(tm,
                    "continuing recovery after aborting TaskMID %u\n",
                    req->TaskMID);

                mpssas_send_abort(sc, tm, cm);
        }
        else {
                /* we didn't get a command completion, so the abort
                 * failed as far as we're concerned.  escalate.
                 */
                mpssas_log_command(tm,
                    "abort failed for TaskMID %u tm %p\n",
                    req->TaskMID, tm);

                mpssas_send_reset(sc, tm,
                    MPI2_SCSITASKMGMT_TASKTYPE_LOGICAL_UNIT_RESET);
        }
}

#define MPS_ABORT_TIMEOUT 5

static int
mpssas_send_abort(struct mps_softc *sc, struct mps_command *tm, struct mps_command *cm)
{
        MPI2_SCSI_TASK_MANAGE_REQUEST *req;
        struct mpssas_target *targ;
        int err;

        targ = cm->cm_targ;
        if (targ->handle == 0) {
                mps_printf(sc, "%s null devhandle for target_id %d\n",
                    __func__, cm->cm_ccb->ccb_h.target_id);
                return -1;
        }

        req = (MPI2_SCSI_TASK_MANAGE_REQUEST *)tm->cm_req;
        req->DevHandle = targ->handle;
        req->Function = MPI2_FUNCTION_SCSI_TASK_MGMT;
        req->TaskType = MPI2_SCSITASKMGMT_TASKTYPE_ABORT_TASK;

        /* XXX Need to handle invalid LUNs */
        MPS_SET_LUN(req->LUN, cm->cm_ccb->ccb_h.target_lun);

        req->TaskMID = cm->cm_desc.Default.SMID;

        tm->cm_data = NULL;
        tm->cm_desc.HighPriority.RequestFlags = MPI2_REQ_DESCRIPT_FLAGS_HIGH_PRIORITY;
        tm->cm_complete = mpssas_abort_complete;
        tm->cm_complete_data = (void *)tm;
        tm->cm_targ = cm->cm_targ;
        tm->cm_lun = cm->cm_lun;

        callout_reset(&tm->cm_callout, MPS_ABORT_TIMEOUT * hz,
            mpssas_tm_timeout, tm);

        targ->aborts++;

        err = mps_map_command(sc, tm);
        if (err)
                mpssas_log_command(tm,
                    "error %d sending abort for cm %p SMID %u\n",
                    err, cm, req->TaskMID);
        return err;
}


static void
mpssas_scsiio_timeout(void *data)
{
        struct mps_softc *sc;
        struct mps_command *cm;
        struct mpssas_target *targ;

        cm = (struct mps_command *)data;
        sc = cm->cm_sc;

        KKASSERT(lockstatus(&sc->mps_lock, curthread) != 0);

        mps_printf(sc, "%s checking sc %p cm %p\n", __func__, sc, cm);

        /*
         * Run the interrupt handler to make sure it's not pending.  This
         * isn't perfect because the command could have already completed
         * and been re-used, though this is unlikely.
         */
        mps_intr_locked(sc);
        if (cm->cm_state == MPS_CM_STATE_FREE) {
                mps_printf(sc, "SCSI command %p sc %p almost timed out\n", cm, sc);
                return;
        }

        if (cm->cm_ccb == NULL) {
                mps_printf(sc, "command timeout with NULL ccb\n");
                return;
        }

        mpssas_log_command(cm, "command timeout cm %p ccb %p\n",
            cm, cm->cm_ccb);

        targ = cm->cm_targ;
        targ->timeouts++;

        /* XXX first, check the firmware state, to see if it's still
         * operational.  if not, do a diag reset.
         */

        cm->cm_ccb->ccb_h.status = CAM_CMD_TIMEOUT;
        cm->cm_state = MPS_CM_STATE_TIMEDOUT;
        TAILQ_INSERT_TAIL(&targ->timedout_commands, cm, cm_recovery);

        if (targ->tm != NULL) {
                /* target already in recovery, just queue up another
                 * timedout command to be processed later.
                 */
                mps_printf(sc, "queued timedout cm %p for processing by tm %p\n",
                    cm, targ->tm);
        }
        else if ((targ->tm = mpssas_alloc_tm(sc)) != NULL) {
                mps_printf(sc, "timedout cm %p allocated tm %p\n",
                    cm, targ->tm);

                /* start recovery by aborting the first timedout command */
                mpssas_send_abort(sc, targ->tm, cm);
        }
        else {
                /* XXX queue this target up for recovery once a TM becomes
                 * available.  The firmware only has a limited number of
                 * HighPriority credits for the high priority requests used
                 * for task management, and we ran out.
                 *
                 * Isilon: don't worry about this for now, since we have
                 * more credits than disks in an enclosure, and limit
                 * ourselves to one TM per target for recovery.
                 */
                mps_printf(sc, "timedout cm %p failed to allocate a tm\n",
                    cm);
        }

}

static void
mpssas_action_scsiio(struct mpssas_softc *sassc, union ccb *ccb)
{
        MPI2_SCSI_IO_REQUEST *req;
        struct ccb_scsiio *csio;
        struct mps_softc *sc;
        struct mpssas_target *targ;
        struct mpssas_lun *lun;
        struct mps_command *cm;
        uint8_t i, lba_byte, *ref_tag_addr;
        uint16_t eedp_flags;

        sc = sassc->sc;
        mps_dprint(sc, MPS_TRACE, "%s ccb %p\n", __func__, ccb);
        KKASSERT(lockstatus(&sc->mps_lock, curthread) != 0);

        csio = &ccb->csio;
        targ = &sassc->targets[csio->ccb_h.target_id];
        if (targ->handle == 0x0) {
                mps_dprint(sc, MPS_TRACE, "%s NULL handle for target %u\n",
                    __func__, csio->ccb_h.target_id);
                csio->ccb_h.status = CAM_TID_INVALID;
                xpt_done(ccb);
                return;
        }
        /*
         * If devinfo is 0 this will be a volume.  In that case don't tell CAM
         * that the volume has timed out.  We want volumes to be enumerated
         * until they are deleted/removed, not just failed.
         */
        if (targ->flags & MPSSAS_TARGET_INREMOVAL) {
                if (targ->devinfo == 0)
                        csio->ccb_h.status = CAM_REQ_CMP;
                else
                        csio->ccb_h.status = CAM_SEL_TIMEOUT;
                xpt_done(ccb);
                return;
        }

        if ((sc->mps_flags & MPS_FLAGS_SHUTDOWN) != 0) {
                mps_dprint(sc, MPS_TRACE, "%s shutting down\n", __func__);
                csio->ccb_h.status = CAM_TID_INVALID;
                xpt_done(ccb);
                return;
        }

        cm = mps_alloc_command(sc);
        if (cm == NULL) {
                if ((sassc->flags & MPSSAS_QUEUE_FROZEN) == 0) {
                        xpt_freeze_simq(sassc->sim, 1);
                        sassc->flags |= MPSSAS_QUEUE_FROZEN;
                }
                ccb->ccb_h.status &= ~CAM_SIM_QUEUED;
                ccb->ccb_h.status |= CAM_REQUEUE_REQ;
                xpt_done(ccb);
                return;
        }

        req = (MPI2_SCSI_IO_REQUEST *)cm->cm_req;
        bzero(req, sizeof(*req));
        req->DevHandle = targ->handle;
        req->Function = MPI2_FUNCTION_SCSI_IO_REQUEST;
        req->MsgFlags = 0;
        req->SenseBufferLowAddress = cm->cm_sense_busaddr;
        req->SenseBufferLength = MPS_SENSE_LEN;
        req->SGLFlags = 0;
        req->ChainOffset = 0;
        req->SGLOffset0 = 24;   /* 32bit word offset to the SGL */
        req->SGLOffset1= 0;
        req->SGLOffset2= 0;
        req->SGLOffset3= 0;
        req->SkipCount = 0;
        req->DataLength = csio->dxfer_len;
        req->BidirectionalDataLength = 0;
        req->IoFlags = csio->cdb_len;
        req->EEDPFlags = 0;

        /* Note: BiDirectional transfers are not supported */
        switch (csio->ccb_h.flags & CAM_DIR_MASK) {
        case CAM_DIR_IN:
                req->Control = MPI2_SCSIIO_CONTROL_READ;
                cm->cm_flags |= MPS_CM_FLAGS_DATAIN;
                break;
        case CAM_DIR_OUT:
                req->Control = MPI2_SCSIIO_CONTROL_WRITE;
                cm->cm_flags |= MPS_CM_FLAGS_DATAOUT;
                break;
        case CAM_DIR_NONE:
        default:
                req->Control = MPI2_SCSIIO_CONTROL_NODATATRANSFER;
                break;
        }

        /*
         * It looks like the hardware doesn't require an explicit tag
         * number for each transaction.  SAM Task Management not supported
         * at the moment.
         */
        switch (csio->tag_action) {
        case MSG_HEAD_OF_Q_TAG:
                req->Control |= MPI2_SCSIIO_CONTROL_HEADOFQ;
                break;
        case MSG_ORDERED_Q_TAG:
                req->Control |= MPI2_SCSIIO_CONTROL_ORDEREDQ;
                break;
        case MSG_ACA_TASK:
                req->Control |= MPI2_SCSIIO_CONTROL_ACAQ;
                break;
        case CAM_TAG_ACTION_NONE:
        case MSG_SIMPLE_Q_TAG:
        default:
                req->Control |= MPI2_SCSIIO_CONTROL_SIMPLEQ;
                break;
        }
        req->Control |= sc->mapping_table[csio->ccb_h.target_id].TLR_bits;

        if (MPS_SET_LUN(req->LUN, csio->ccb_h.target_lun) != 0) {
                mps_free_command(sc, cm);
                ccb->ccb_h.status = CAM_LUN_INVALID;
                xpt_done(ccb);
                return;
        }

        if (csio->ccb_h.flags & CAM_CDB_POINTER)
                bcopy(csio->cdb_io.cdb_ptr, &req->CDB.CDB32[0], csio->cdb_len);
        else
                bcopy(csio->cdb_io.cdb_bytes, &req->CDB.CDB32[0],csio->cdb_len);
        req->IoFlags = csio->cdb_len;

        /*
         * Check if EEDP is supported and enabled.  If it is then check if the
         * SCSI opcode could be using EEDP.  If so, make sure the LUN exists and
         * is formatted for EEDP support.  If all of this is true, set CDB up
         * for EEDP transfer.
         */
        eedp_flags = op_code_prot[req->CDB.CDB32[0]];
        if (sc->eedp_enabled && eedp_flags) {
                SLIST_FOREACH(lun, &targ->luns, lun_link) {
                        if (lun->lun_id == csio->ccb_h.target_lun) {
                                break;
                        }
                }

                if ((lun != NULL) && (lun->eedp_formatted)) {
                        req->EEDPBlockSize = lun->eedp_block_size;
                        eedp_flags |= (MPI2_SCSIIO_EEDPFLAGS_INC_PRI_REFTAG |
                            MPI2_SCSIIO_EEDPFLAGS_CHECK_REFTAG |
                            MPI2_SCSIIO_EEDPFLAGS_CHECK_GUARD);
                        req->EEDPFlags = eedp_flags;

                        /*
                         * If CDB less than 32, fill in Primary Ref Tag with
                         * low 4 bytes of LBA.  If CDB is 32, tag stuff is
                         * already there.  Also, set protection bit.  FreeBSD
                         * currently does not support CDBs bigger than 16, but
                         * the code doesn't hurt, and will be here for the
                         * future.
                         */
                        if (csio->cdb_len != 32) {
                                lba_byte = (csio->cdb_len == 16) ? 6 : 2;
                                ref_tag_addr = (uint8_t *)&req->CDB.EEDP32.
                                    PrimaryReferenceTag;
                                for (i = 0; i < 4; i++) {
                                        *ref_tag_addr =
                                            req->CDB.CDB32[lba_byte + i];
                                        ref_tag_addr++;
                                }
                                req->CDB.EEDP32.PrimaryApplicationTagMask =
                                    0xFFFF;
                                req->CDB.CDB32[1] = (req->CDB.CDB32[1] & 0x1F) |
                                    0x20;
                        } else {
                                eedp_flags |=
                                    MPI2_SCSIIO_EEDPFLAGS_INC_PRI_APPTAG;
                                req->EEDPFlags = eedp_flags;
                                req->CDB.CDB32[10] = (req->CDB.CDB32[10] &
                                    0x1F) | 0x20;
                        }
                }
        }

        cm->cm_data = csio->data_ptr;
        cm->cm_length = csio->dxfer_len;
        cm->cm_sge = &req->SGL;
        cm->cm_sglsize = (32 - 24) * 4;
        cm->cm_desc.SCSIIO.RequestFlags = MPI2_REQ_DESCRIPT_FLAGS_SCSI_IO;
        cm->cm_desc.SCSIIO.DevHandle = targ->handle;
        cm->cm_complete = mpssas_scsiio_complete;
        cm->cm_complete_data = ccb;
        cm->cm_targ = targ;
        cm->cm_lun = csio->ccb_h.target_lun;
        cm->cm_ccb = ccb;

        /*
         * If HBA is a WD and the command is not for a retry, try to build a
         * direct I/O message. If failed, or the command is for a retry, send
         * the I/O to the IR volume itself.
         */
        if (sc->WD_valid_config) {
                if (ccb->ccb_h.status != MPS_WD_RETRY) {
                        mpssas_direct_drive_io(sassc, cm, ccb);
                } else {
                        ccb->ccb_h.status = CAM_REQ_INPROG;
                }
        }

        callout_reset(&cm->cm_callout, (ccb->ccb_h.timeout * hz) / 1000,
           mpssas_scsiio_timeout, cm);

        targ->issued++;
        targ->outstanding++;
        TAILQ_INSERT_TAIL(&targ->commands, cm, cm_link);

        if ((sc->mps_debug & MPS_TRACE) != 0)
                mpssas_log_command(cm, "%s cm %p ccb %p outstanding %u\n",
                    __func__, cm, ccb, targ->outstanding);

        mps_map_command(sc, cm);
        return;
}

static void
mpssas_scsiio_complete(struct mps_softc *sc, struct mps_command *cm)
{
        MPI2_SCSI_IO_REPLY *rep;
        union ccb *ccb;
        struct ccb_scsiio *csio;
        struct mpssas_softc *sassc;
        struct scsi_vpd_supported_page_list *vpd_list = NULL;
        u8 *TLR_bits, TLR_on;
        int dir = 0, i;
        u16 alloc_len;

        mps_dprint(sc, MPS_TRACE,
            "%s cm %p SMID %u ccb %p reply %p outstanding %u\n",
            __func__, cm, cm->cm_desc.Default.SMID, cm->cm_ccb, cm->cm_reply,
            cm->cm_targ->outstanding);

        callout_stop(&cm->cm_callout);
        KKASSERT(lockstatus(&sc->mps_lock, curthread) != 0);

        sassc = sc->sassc;
        ccb = cm->cm_complete_data;
        csio = &ccb->csio;
        rep = (MPI2_SCSI_IO_REPLY *)cm->cm_reply;
        /*
         * XXX KDM if the chain allocation fails, does it matter if we do
         * the sync and unload here?  It is simpler to do it in every case,
         * assuming it doesn't cause problems.
         */
        if (cm->cm_data != NULL) {
                if (cm->cm_flags & MPS_CM_FLAGS_DATAIN)
                        dir = BUS_DMASYNC_POSTREAD;
                else if (cm->cm_flags & MPS_CM_FLAGS_DATAOUT)
                        dir = BUS_DMASYNC_POSTWRITE;
                bus_dmamap_sync(sc->buffer_dmat, cm->cm_dmamap, dir);
                bus_dmamap_unload(sc->buffer_dmat, cm->cm_dmamap);
        }

        cm->cm_targ->completed++;
        cm->cm_targ->outstanding--;
        TAILQ_REMOVE(&cm->cm_targ->commands, cm, cm_link);

        if (cm->cm_state == MPS_CM_STATE_TIMEDOUT) {
                TAILQ_REMOVE(&cm->cm_targ->timedout_commands, cm, cm_recovery);
                if (cm->cm_reply != NULL)
                        mpssas_log_command(cm,
                            "completed timedout cm %p ccb %p during recovery "
                            "ioc %x scsi %x state %x xfer %u\n",
                            cm, cm->cm_ccb,
                            rep->IOCStatus, rep->SCSIStatus, rep->SCSIState,
                            rep->TransferCount);
                else
                        mpssas_log_command(cm,
                            "completed timedout cm %p ccb %p during recovery\n",
                            cm, cm->cm_ccb);
        } else if (cm->cm_targ->tm != NULL) {
                if (cm->cm_reply != NULL)
                        mpssas_log_command(cm,
                            "completed cm %p ccb %p during recovery "
                            "ioc %x scsi %x state %x xfer %u\n",
                            cm, cm->cm_ccb,
                            rep->IOCStatus, rep->SCSIStatus, rep->SCSIState,
                            rep->TransferCount);
                else
                        mpssas_log_command(cm,
                            "completed cm %p ccb %p during recovery\n",
                            cm, cm->cm_ccb);
        } else if ((sc->mps_flags & MPS_FLAGS_DIAGRESET) != 0) {
                mpssas_log_command(cm,
                    "reset completed cm %p ccb %p\n",
                    cm, cm->cm_ccb);
        }

        if ((cm->cm_flags & MPS_CM_FLAGS_ERROR_MASK) != 0) {
                /*
                 * We ran into an error after we tried to map the command,
                 * so we're getting a callback without queueing the command
                 * to the hardware.  So we set the status here, and it will
                 * be retained below.  We'll go through the "fast path",
                 * because there can be no reply when we haven't actually
                 * gone out to the hardware.
                 */
                ccb->ccb_h.status |= CAM_REQUEUE_REQ;

                /*
                 * Currently the only error included in the mask is
                 * MPS_CM_FLAGS_CHAIN_FAILED, which means we're out of
                 * chain frames.  We need to freeze the queue until we get
                 * a command that completed without this error, which will
                 * hopefully have some chain frames attached that we can
                 * use.  If we wanted to get smarter about it, we would
                 * only unfreeze the queue in this condition when we're
                 * sure that we're getting some chain frames back.  That's
                 * probably unnecessary.
                 */
                if ((sassc->flags & MPSSAS_QUEUE_FROZEN) == 0) {
                        xpt_freeze_simq(sassc->sim, 1);
                        sassc->flags |= MPSSAS_QUEUE_FROZEN;
                        mps_dprint(sc, MPS_INFO, "Error sending command, "
                                   "freezing SIM queue\n");
                }
        }

        /* Take the fast path to completion */
        if (cm->cm_reply == NULL) {
                if ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_INPROG) {
                        if ((sc->mps_flags & MPS_FLAGS_DIAGRESET) != 0)
                                ccb->ccb_h.status = CAM_SCSI_BUS_RESET;
                        else {
                                ccb->ccb_h.status = CAM_REQ_CMP;
                                ccb->csio.scsi_status = SCSI_STATUS_OK;
                        }
                        if (sassc->flags & MPSSAS_QUEUE_FROZEN) {
                                ccb->ccb_h.status |= CAM_RELEASE_SIMQ;
                                sassc->flags &= ~MPSSAS_QUEUE_FROZEN;
                                mps_dprint(sc, MPS_INFO,
                                           "Unfreezing SIM queue\n");
                        }
                }

                /*
                 * There are two scenarios where the status won't be
                 * CAM_REQ_CMP.  The first is if MPS_CM_FLAGS_ERROR_MASK is
                 * set, the second is in the MPS_FLAGS_DIAGRESET above.
                 */
                if ((ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
                        /*
                         * Freeze the dev queue so that commands are
                         * executed in the correct order with after error
                         * recovery.
                         */
                        ccb->ccb_h.status |= CAM_DEV_QFRZN;
                        xpt_freeze_devq(ccb->ccb_h.path, /*count*/ 1);
                }
                mps_free_command(sc, cm);
                xpt_done(ccb);
                return;
        }

        if (sc->mps_debug & MPS_TRACE)
                mpssas_log_command(cm,
                    "ioc %x scsi %x state %x xfer %u\n",
                    rep->IOCStatus, rep->SCSIStatus,
                    rep->SCSIState, rep->TransferCount);

        /*
         * If this is a Direct Drive I/O, reissue the I/O to the original IR
         * Volume if an error occurred (normal I/O retry).  Use the original
         * CCB, but set a flag that this will be a retry so that it's sent to
         * the original volume.  Free the command but reuse the CCB.
         */
        if (cm->cm_flags & MPS_CM_FLAGS_DD_IO) {
                mps_free_command(sc, cm);
                ccb->ccb_h.status = MPS_WD_RETRY;
                mpssas_action_scsiio(sassc, ccb);
                return;
        }

        switch (rep->IOCStatus & MPI2_IOCSTATUS_MASK) {
        case MPI2_IOCSTATUS_SCSI_DATA_UNDERRUN:
                csio->resid = cm->cm_length - rep->TransferCount;
                /* FALLTHROUGH */
        case MPI2_IOCSTATUS_SUCCESS:
        case MPI2_IOCSTATUS_SCSI_RECOVERED_ERROR:

                if ((rep->IOCStatus & MPI2_IOCSTATUS_MASK) ==
                    MPI2_IOCSTATUS_SCSI_RECOVERED_ERROR)
                        mpssas_log_command(cm, "recovered error\n");

                /* Completion failed at the transport level. */
                if (rep->SCSIState & (MPI2_SCSI_STATE_NO_SCSI_STATUS |
                    MPI2_SCSI_STATE_TERMINATED)) {
                        ccb->ccb_h.status = CAM_REQ_CMP_ERR;
                        break;
                }

                /* In a modern packetized environment, an autosense failure
                 * implies that there's not much else that can be done to
                 * recover the command.
                 */
                if (rep->SCSIState & MPI2_SCSI_STATE_AUTOSENSE_FAILED) {
                        ccb->ccb_h.status = CAM_AUTOSENSE_FAIL;
                        break;
                }

                /*
                 * CAM doesn't care about SAS Response Info data, but if this is
                 * the state check if TLR should be done.  If not, clear the
                 * TLR_bits for the target.
                 */
                if ((rep->SCSIState & MPI2_SCSI_STATE_RESPONSE_INFO_VALID) &&
                    ((rep->ResponseInfo & MPI2_SCSI_RI_MASK_REASONCODE) ==
                    MPS_SCSI_RI_INVALID_FRAME)) {
                        sc->mapping_table[csio->ccb_h.target_id].TLR_bits =
                            (u8)MPI2_SCSIIO_CONTROL_NO_TLR;
                }

                /*
                 * Intentionally override the normal SCSI status reporting
                 * for these two cases.  These are likely to happen in a
                 * multi-initiator environment, and we want to make sure that
                 * CAM retries these commands rather than fail them.
                 */
                if ((rep->SCSIStatus == MPI2_SCSI_STATUS_COMMAND_TERMINATED) ||
                    (rep->SCSIStatus == MPI2_SCSI_STATUS_TASK_ABORTED)) {
                        ccb->ccb_h.status = CAM_REQ_ABORTED;
                        break;
                }

                /* Handle normal status and sense */
                csio->scsi_status = rep->SCSIStatus;
                if (rep->SCSIStatus == MPI2_SCSI_STATUS_GOOD)
                        ccb->ccb_h.status = CAM_REQ_CMP;
                else
                        ccb->ccb_h.status = CAM_SCSI_STATUS_ERROR;

                if (rep->SCSIState & MPI2_SCSI_STATE_AUTOSENSE_VALID) {
                        int sense_len, returned_sense_len;

                        returned_sense_len = min(rep->SenseCount,
                            sizeof(struct scsi_sense_data));
                        if (returned_sense_len < ccb->csio.sense_len)
                                ccb->csio.sense_resid = ccb->csio.sense_len -
                                        returned_sense_len;
                        else
                                ccb->csio.sense_resid = 0;

                        sense_len = min(returned_sense_len,
                            ccb->csio.sense_len - ccb->csio.sense_resid);
                        bzero(&ccb->csio.sense_data,
                              sizeof(ccb->csio.sense_data));
                        bcopy(cm->cm_sense, &ccb->csio.sense_data, sense_len);
                        ccb->ccb_h.status |= CAM_AUTOSNS_VALID;
                }

                /*
                 * Check if this is an INQUIRY command.  If it's a VPD inquiry,
                 * and it's page code 0 (Supported Page List), and there is
                 * inquiry data, and this is for a sequential access device, and
                 * the device is an SSP target, and TLR is supported by the
                 * controller, turn the TLR_bits value ON if page 0x90 is
                 * supported.
                 */
                if ((csio->cdb_io.cdb_bytes[0] == INQUIRY) &&
                    (csio->cdb_io.cdb_bytes[1] & SI_EVPD) &&
                    (csio->cdb_io.cdb_bytes[2] == SVPD_SUPPORTED_PAGE_LIST) &&
                    (csio->data_ptr != NULL) && (((uint8_t *)cm->cm_data)[0] ==
                    T_SEQUENTIAL) && (sc->control_TLR) &&
                    (sc->mapping_table[csio->ccb_h.target_id].device_info &
                    MPI2_SAS_DEVICE_INFO_SSP_TARGET)) {
                        vpd_list = (struct scsi_vpd_supported_page_list *)
                            csio->data_ptr;
                        TLR_bits = &sc->mapping_table[csio->ccb_h.target_id].
                            TLR_bits;
                        *TLR_bits = (u8)MPI2_SCSIIO_CONTROL_NO_TLR;
                        TLR_on = (u8)MPI2_SCSIIO_CONTROL_TLR_ON;
                        alloc_len = ((u16)csio->cdb_io.cdb_bytes[3] << 8) +
                            csio->cdb_io.cdb_bytes[4];
                        for (i = 0; i < MIN(vpd_list->length, alloc_len); i++) {
                                if (vpd_list->list[i] == 0x90) {
                                        *TLR_bits = TLR_on;
                                        break;
                                }
                        }
                }
                break;
        case MPI2_IOCSTATUS_SCSI_INVALID_DEVHANDLE:
        case MPI2_IOCSTATUS_SCSI_DEVICE_NOT_THERE:
                /*
                 * If devinfo is 0 this will be a volume.  In that case don't
                 * tell CAM that the volume is not there.  We want volumes to
                 * be enumerated until they are deleted/removed, not just
                 * failed.
                 */
                if (cm->cm_targ->devinfo == 0)
                        ccb->ccb_h.status = CAM_REQ_CMP;
                else
                        ccb->ccb_h.status = CAM_DEV_NOT_THERE;
                break;
        case MPI2_IOCSTATUS_INVALID_SGL:
                mps_print_scsiio_cmd(sc, cm);
                ccb->ccb_h.status = CAM_UNREC_HBA_ERROR;
                break;
        case MPI2_IOCSTATUS_SCSI_TASK_TERMINATED:
                /*
                 * This is one of the responses that comes back when an I/O
                 * has been aborted.  If it is because of a timeout that we
                 * initiated, just set the status to CAM_CMD_TIMEOUT.
                 * Otherwise set it to CAM_REQ_ABORTED.  The effect on the
                 * command is the same (it gets retried, subject to the
                 * retry counter), the only difference is what gets printed
                 * on the console.
                 */
                if (cm->cm_state == MPS_CM_STATE_TIMEDOUT)
                        ccb->ccb_h.status = CAM_CMD_TIMEOUT;
                else
                        ccb->ccb_h.status = CAM_REQ_ABORTED;
                break;
        case MPI2_IOCSTATUS_SCSI_DATA_OVERRUN:
                /* resid is ignored for this condition */
                csio->resid = 0;
                ccb->ccb_h.status = CAM_DATA_RUN_ERR;
                break;
        case MPI2_IOCSTATUS_SCSI_IOC_TERMINATED:
        case MPI2_IOCSTATUS_SCSI_EXT_TERMINATED:
                /*
                 * Since these are generally external (i.e. hopefully
                 * transient transport-related) errors, retry these without
                 * decrementing the retry count.
                 */
                ccb->ccb_h.status = CAM_REQUEUE_REQ;
                mpssas_log_command(cm,
                    "terminated ioc %x scsi %x state %x xfer %u\n",
                    rep->IOCStatus, rep->SCSIStatus, rep->SCSIState,
                    rep->TransferCount);
                break;
        case MPI2_IOCSTATUS_INVALID_FUNCTION:
        case MPI2_IOCSTATUS_INTERNAL_ERROR:
        case MPI2_IOCSTATUS_INVALID_VPID:
        case MPI2_IOCSTATUS_INVALID_FIELD:
        case MPI2_IOCSTATUS_INVALID_STATE:
        case MPI2_IOCSTATUS_OP_STATE_NOT_SUPPORTED:
        case MPI2_IOCSTATUS_SCSI_IO_DATA_ERROR:
        case MPI2_IOCSTATUS_SCSI_PROTOCOL_ERROR:
        case MPI2_IOCSTATUS_SCSI_RESIDUAL_MISMATCH:
        case MPI2_IOCSTATUS_SCSI_TASK_MGMT_FAILED:
        default:
                mpssas_log_command(cm,
                    "completed ioc %x scsi %x state %x xfer %u\n",
                    rep->IOCStatus, rep->SCSIStatus, rep->SCSIState,
                    rep->TransferCount);
                csio->resid = cm->cm_length;
                ccb->ccb_h.status = CAM_REQ_CMP_ERR;
                break;
        }

        if (sassc->flags & MPSSAS_QUEUE_FROZEN) {
                ccb->ccb_h.status |= CAM_RELEASE_SIMQ;
                sassc->flags &= ~MPSSAS_QUEUE_FROZEN;
                mps_dprint(sc, MPS_INFO, "Command completed, "
                           "unfreezing SIM queue\n");
        }

        if ((ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
                ccb->ccb_h.status |= CAM_DEV_QFRZN;
                xpt_freeze_devq(ccb->ccb_h.path, /*count*/ 1);
        }

        mps_free_command(sc, cm);
        xpt_done(ccb);
}

static void
mpssas_direct_drive_io(struct mpssas_softc *sassc, struct mps_command *cm,
    union ccb *ccb) {
        pMpi2SCSIIORequest_t    pIO_req;
        struct mps_softc        *sc = sassc->sc;
        uint64_t                virtLBA;
        uint32_t                physLBA, stripe_offset, stripe_unit;
        uint32_t                io_size, column;
        uint8_t                 *ptrLBA, lba_idx, physLBA_byte, *CDB;

        /*
         * If this is a valid SCSI command (Read6, Read10, Read16, Write6,
         * Write10, or Write16), build a direct I/O message.  Otherwise, the I/O
         * will be sent to the IR volume itself.  Since Read6 and Write6 are a
         * bit different than the 10/16 CDBs, handle them separately.
         */
        pIO_req = (pMpi2SCSIIORequest_t)cm->cm_req;
        CDB = pIO_req->CDB.CDB32;

        /*
         * Handle 6 byte CDBs.
         */
        if ((pIO_req->DevHandle == sc->DD_dev_handle) && ((CDB[0] == READ_6) ||
            (CDB[0] == WRITE_6))) {
                /*
                 * Get the transfer size in blocks.
                 */
                io_size = (cm->cm_length >> sc->DD_block_exponent);

                /*
                 * Get virtual LBA given in the CDB.
                 */
                virtLBA = ((uint64_t)(CDB[1] & 0x1F) << 16) |
                    ((uint64_t)CDB[2] << 8) | (uint64_t)CDB[3];

                /*
                 * Check that LBA range for I/O does not exceed volume's
                 * MaxLBA.
                 */
                if ((virtLBA + (uint64_t)io_size - 1) <=
                    sc->DD_max_lba) {
                        /*
                         * Check if the I/O crosses a stripe boundary.  If not,
                         * translate the virtual LBA to a physical LBA and set
                         * the DevHandle for the PhysDisk to be used.  If it
                         * does cross a boundry, do normal I/O.  To get the
                         * right DevHandle to use, get the map number for the
                         * column, then use that map number to look up the
                         * DevHandle of the PhysDisk.
                         */
                        stripe_offset = (uint32_t)virtLBA &
                            (sc->DD_stripe_size - 1);
                        if ((stripe_offset + io_size) <= sc->DD_stripe_size) {
                                physLBA = (uint32_t)virtLBA >>
                                    sc->DD_stripe_exponent;
                                stripe_unit = physLBA / sc->DD_num_phys_disks;
                                column = physLBA % sc->DD_num_phys_disks;
                                pIO_req->DevHandle =
                                    sc->DD_column_map[column].dev_handle;
                                cm->cm_desc.SCSIIO.DevHandle =
                                    pIO_req->DevHandle;

                                physLBA = (stripe_unit <<
                                    sc->DD_stripe_exponent) + stripe_offset;
                                ptrLBA = &pIO_req->CDB.CDB32[1];
                                physLBA_byte = (uint8_t)(physLBA >> 16);
                                *ptrLBA = physLBA_byte;
                                ptrLBA = &pIO_req->CDB.CDB32[2];
                                physLBA_byte = (uint8_t)(physLBA >> 8);
                                *ptrLBA = physLBA_byte;
                                ptrLBA = &pIO_req->CDB.CDB32[3];
                                physLBA_byte = (uint8_t)physLBA;
                                *ptrLBA = physLBA_byte;

                                /*
                                 * Set flag that Direct Drive I/O is
                                 * being done.
                                 */
                                cm->cm_flags |= MPS_CM_FLAGS_DD_IO;
                        }
                }
                return;
        }

        /*
         * Handle 10 or 16 byte CDBs.
         */
        if ((pIO_req->DevHandle == sc->DD_dev_handle) && ((CDB[0] == READ_10) ||
            (CDB[0] == WRITE_10) || (CDB[0] == READ_16) ||
            (CDB[0] == WRITE_16))) {
                /*
                 * For 16-byte CDB's, verify that the upper 4 bytes of the CDB
                 * are 0.  If not, this is accessing beyond 2TB so handle it in
                 * the else section.  10-byte CDB's are OK.
                 */
                if ((CDB[0] < READ_16) ||
                    !(CDB[2] | CDB[3] | CDB[4] | CDB[5])) {
                        /*
                         * Get the transfer size in blocks.
                         */
                        io_size = (cm->cm_length >> sc->DD_block_exponent);

                        /*
                         * Get virtual LBA.  Point to correct lower 4 bytes of
                         * LBA in the CDB depending on command.
                         */
                        lba_idx = (CDB[0] < READ_16) ? 2 : 6;
                        virtLBA = ((uint64_t)CDB[lba_idx] << 24) |
                            ((uint64_t)CDB[lba_idx + 1] << 16) |
                            ((uint64_t)CDB[lba_idx + 2] << 8) |
                            (uint64_t)CDB[lba_idx + 3];

                        /*
                         * Check that LBA range for I/O does not exceed volume's
                         * MaxLBA.
                         */
                        if ((virtLBA + (uint64_t)io_size - 1) <=
                            sc->DD_max_lba) {
                                /*
                                 * Check if the I/O crosses a stripe boundary.
                                 * If not, translate the virtual LBA to a
                                 * physical LBA and set the DevHandle for the
                                 * PhysDisk to be used.  If it does cross a
                                 * boundry, do normal I/O.  To get the right
                                 * DevHandle to use, get the map number for the
                                 * column, then use that map number to look up
                                 * the DevHandle of the PhysDisk.
                                 */
                                stripe_offset = (uint32_t)virtLBA &
                                    (sc->DD_stripe_size - 1);
                                if ((stripe_offset + io_size) <=
                                    sc->DD_stripe_size) {
                                        physLBA = (uint32_t)virtLBA >>
                                            sc->DD_stripe_exponent;
                                        stripe_unit = physLBA /
                                            sc->DD_num_phys_disks;
                                        column = physLBA %
                                            sc->DD_num_phys_disks;
                                        pIO_req->DevHandle =
                                            sc->DD_column_map[column].
                                            dev_handle;
                                        cm->cm_desc.SCSIIO.DevHandle =
                                            pIO_req->DevHandle;

                                        physLBA = (stripe_unit <<
                                            sc->DD_stripe_exponent) +
                                            stripe_offset;
                                        ptrLBA =
                                            &pIO_req->CDB.CDB32[lba_idx];
                                        physLBA_byte = (uint8_t)(physLBA >> 24);
                                        *ptrLBA = physLBA_byte;
                                        ptrLBA =
                                            &pIO_req->CDB.CDB32[lba_idx + 1];
                                        physLBA_byte = (uint8_t)(physLBA >> 16);
                                        *ptrLBA = physLBA_byte;
                                        ptrLBA =
                                            &pIO_req->CDB.CDB32[lba_idx + 2];
                                        physLBA_byte = (uint8_t)(physLBA >> 8);
                                        *ptrLBA = physLBA_byte;
                                        ptrLBA =
                                            &pIO_req->CDB.CDB32[lba_idx + 3];
                                        physLBA_byte = (uint8_t)physLBA;
                                        *ptrLBA = physLBA_byte;

                                        /*
                                         * Set flag that Direct Drive I/O is
                                         * being done.
                                         */
                                        cm->cm_flags |= MPS_CM_FLAGS_DD_IO;
                                }
                        }
                } else {
                        /*
                         * 16-byte CDB and the upper 4 bytes of the CDB are not
                         * 0.  Get the transfer size in blocks.
                         */
                        io_size = (cm->cm_length >> sc->DD_block_exponent);

                        /*
                         * Get virtual LBA.
                         */
                        virtLBA = ((uint64_t)CDB[2] << 54) |
                            ((uint64_t)CDB[3] << 48) |
                            ((uint64_t)CDB[4] << 40) |
                            ((uint64_t)CDB[5] << 32) |
                            ((uint64_t)CDB[6] << 24) |
                            ((uint64_t)CDB[7] << 16) |
                            ((uint64_t)CDB[8] << 8) |
                            (uint64_t)CDB[9];

                        /*
                         * Check that LBA range for I/O does not exceed volume's
                         * MaxLBA.
                         */
                        if ((virtLBA + (uint64_t)io_size - 1) <=
                            sc->DD_max_lba) {
                                /*
                                 * Check if the I/O crosses a stripe boundary.
                                 * If not, translate the virtual LBA to a
                                 * physical LBA and set the DevHandle for the
                                 * PhysDisk to be used.  If it does cross a
                                 * boundry, do normal I/O.  To get the right
                                 * DevHandle to use, get the map number for the
                                 * column, then use that map number to look up
                                 * the DevHandle of the PhysDisk.
                                 */
                                stripe_offset = (uint32_t)virtLBA &
                                    (sc->DD_stripe_size - 1);
                                if ((stripe_offset + io_size) <=
                                    sc->DD_stripe_size) {
                                        physLBA = (uint32_t)(virtLBA >>
                                            sc->DD_stripe_exponent);
                                        stripe_unit = physLBA /
                                            sc->DD_num_phys_disks;
                                        column = physLBA %
                                            sc->DD_num_phys_disks;
                                        pIO_req->DevHandle =
                                            sc->DD_column_map[column].
                                            dev_handle;
                                        cm->cm_desc.SCSIIO.DevHandle =
                                            pIO_req->DevHandle;

                                        physLBA = (stripe_unit <<
                                            sc->DD_stripe_exponent) +
                                            stripe_offset;

                                        /*
                                         * Set upper 4 bytes of LBA to 0.  We
                                         * assume that the phys disks are less
                                         * than 2 TB's in size.  Then, set the
                                         * lower 4 bytes.
                                         */
                                        pIO_req->CDB.CDB32[2] = 0;
                                        pIO_req->CDB.CDB32[3] = 0;
                                        pIO_req->CDB.CDB32[4] = 0;
                                        pIO_req->CDB.CDB32[5] = 0;
                                        ptrLBA = &pIO_req->CDB.CDB32[6];
                                        physLBA_byte = (uint8_t)(physLBA >> 24);
                                        *ptrLBA = physLBA_byte;
                                        ptrLBA = &pIO_req->CDB.CDB32[7];
                                        physLBA_byte = (uint8_t)(physLBA >> 16);
                                        *ptrLBA = physLBA_byte;
                                        ptrLBA = &pIO_req->CDB.CDB32[8];
                                        physLBA_byte = (uint8_t)(physLBA >> 8);
                                        *ptrLBA = physLBA_byte;
                                        ptrLBA = &pIO_req->CDB.CDB32[9];
                                        physLBA_byte = (uint8_t)physLBA;
                                        *ptrLBA = physLBA_byte;

                                        /*
                                         * Set flag that Direct Drive I/O is
                                         * being done.
                                         */
                                        cm->cm_flags |= MPS_CM_FLAGS_DD_IO;
                                }
                        }
                }
        }
}

#if __FreeBSD_version >= 900026
static void
mpssas_smpio_complete(struct mps_softc *sc, struct mps_command *cm)
{
        MPI2_SMP_PASSTHROUGH_REPLY *rpl;
        MPI2_SMP_PASSTHROUGH_REQUEST *req;
        uint64_t sasaddr;
        union ccb *ccb;

        ccb = cm->cm_complete_data;

        /*
         * Currently there should be no way we can hit this case.  It only
         * happens when we have a failure to allocate chain frames, and SMP
         * commands require two S/G elements only.  That should be handled
         * in the standard request size.
         */
        if ((cm->cm_flags & MPS_CM_FLAGS_ERROR_MASK) != 0) {
                mps_printf(sc, "%s: cm_flags = %#x on SMP request!\n",
                           __func__, cm->cm_flags);
                ccb->ccb_h.status = CAM_REQ_CMP_ERR;
                goto bailout;
        }

        rpl = (MPI2_SMP_PASSTHROUGH_REPLY *)cm->cm_reply;
        if (rpl == NULL) {
                mps_dprint(sc, MPS_INFO, "%s: NULL cm_reply!\n", __func__);
                ccb->ccb_h.status = CAM_REQ_CMP_ERR;
                goto bailout;
        }

        req = (MPI2_SMP_PASSTHROUGH_REQUEST *)cm->cm_req;
        sasaddr = le32toh(req->SASAddress.Low);
        sasaddr |= ((uint64_t)(le32toh(req->SASAddress.High))) << 32;

        if ((rpl->IOCStatus & MPI2_IOCSTATUS_MASK) != MPI2_IOCSTATUS_SUCCESS ||
            rpl->SASStatus != MPI2_SASSTATUS_SUCCESS) {
                mps_dprint(sc, MPS_INFO, "%s: IOCStatus %04x SASStatus %02x\n",
                    __func__, rpl->IOCStatus, rpl->SASStatus);
                ccb->ccb_h.status = CAM_REQ_CMP_ERR;
                goto bailout;
        }

        mps_dprint(sc, MPS_INFO, "%s: SMP request to SAS address "
                   "%#jx completed successfully\n", __func__,
                   (uintmax_t)sasaddr);

        if (ccb->smpio.smp_response[2] == SMP_FR_ACCEPTED)
                ccb->ccb_h.status = CAM_REQ_CMP;
        else
                ccb->ccb_h.status = CAM_SMP_STATUS_ERROR;

bailout:
        /*
         * We sync in both directions because we had DMAs in the S/G list
         * in both directions.
         */
        bus_dmamap_sync(sc->buffer_dmat, cm->cm_dmamap,
                        BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
        bus_dmamap_unload(sc->buffer_dmat, cm->cm_dmamap);
        mps_free_command(sc, cm);
        xpt_done(ccb);
}

static void
mpssas_send_smpcmd(struct mpssas_softc *sassc, union ccb *ccb, uint64_t sasaddr)
{
        struct mps_command *cm;
        uint8_t *request, *response;
        MPI2_SMP_PASSTHROUGH_REQUEST *req;
        struct mps_softc *sc;
        int error;

        sc = sassc->sc;
        error = 0;

        /*
         * XXX We don't yet support physical addresses here.
         */
        if (ccb->ccb_h.flags & (CAM_DATA_PHYS|CAM_SG_LIST_PHYS)) {
                mps_printf(sc, "%s: physical addresses not supported\n",
                           __func__);
                ccb->ccb_h.status = CAM_REQ_INVALID;
                xpt_done(ccb);
                return;
        }

        /*
         * If the user wants to send an S/G list, check to make sure they
         * have single buffers.
         */
        if (ccb->ccb_h.flags & CAM_SCATTER_VALID) {
                /*
                 * The chip does not support more than one buffer for the
                 * request or response.
                 */
                if ((ccb->smpio.smp_request_sglist_cnt > 1)
                  || (ccb->smpio.smp_response_sglist_cnt > 1)) {
                        mps_printf(sc, "%s: multiple request or response "
                                   "buffer segments not supported for SMP\n",
                                   __func__);
                        ccb->ccb_h.status = CAM_REQ_INVALID;
                        xpt_done(ccb);
                        return;
                }

                /*
                 * The CAM_SCATTER_VALID flag was originally implemented
                 * for the XPT_SCSI_IO CCB, which only has one data pointer.
                 * We have two.  So, just take that flag to mean that we
                 * might have S/G lists, and look at the S/G segment count
                 * to figure out whether that is the case for each individual
                 * buffer.
                 */
                if (ccb->smpio.smp_request_sglist_cnt != 0) {
                        bus_dma_segment_t *req_sg;

                        req_sg = (bus_dma_segment_t *)ccb->smpio.smp_request;
                        request = (uint8_t *)req_sg[0].ds_addr;
                } else
                        request = ccb->smpio.smp_request;

                if (ccb->smpio.smp_response_sglist_cnt != 0) {
                        bus_dma_segment_t *rsp_sg;

                        rsp_sg = (bus_dma_segment_t *)ccb->smpio.smp_response;
                        response = (uint8_t *)rsp_sg[0].ds_addr;
                } else
                        response = ccb->smpio.smp_response;
        } else {
                request = ccb->smpio.smp_request;
                response = ccb->smpio.smp_response;
        }

        cm = mps_alloc_command(sc);
        if (cm == NULL) {
                mps_printf(sc, "%s: cannot allocate command\n", __func__);
                ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
                xpt_done(ccb);
                return;
        }

        req = (MPI2_SMP_PASSTHROUGH_REQUEST *)cm->cm_req;
        bzero(req, sizeof(*req));
        req->Function = MPI2_FUNCTION_SMP_PASSTHROUGH;

        /* Allow the chip to use any route to this SAS address. */
        req->PhysicalPort = 0xff;

        req->RequestDataLength = ccb->smpio.smp_request_len;
        req->SGLFlags =
            MPI2_SGLFLAGS_SYSTEM_ADDRESS_SPACE | MPI2_SGLFLAGS_SGL_TYPE_MPI;

        mps_dprint(sc, MPS_INFO, "%s: sending SMP request to SAS "
                   "address %#jx\n", __func__, (uintmax_t)sasaddr);

        mpi_init_sge(cm, req, &req->SGL);

        /*
         * Set up a uio to pass into mps_map_command().  This allows us to
         * do one map command, and one busdma call in there.
         */
        cm->cm_uio.uio_iov = cm->cm_iovec;
        cm->cm_uio.uio_iovcnt = 2;
        cm->cm_uio.uio_segflg = UIO_SYSSPACE;

        /*
         * The read/write flag isn't used by busdma, but set it just in
         * case.  This isn't exactly accurate, either, since we're going in
         * both directions.
         */
        cm->cm_uio.uio_rw = UIO_WRITE;

        cm->cm_iovec[0].iov_base = request;
        cm->cm_iovec[0].iov_len = req->RequestDataLength;
        cm->cm_iovec[1].iov_base = response;
        cm->cm_iovec[1].iov_len = ccb->smpio.smp_response_len;

        cm->cm_uio.uio_resid = cm->cm_iovec[0].iov_len +
                               cm->cm_iovec[1].iov_len;

        /*
         * Trigger a warning message in mps_data_cb() for the user if we
         * wind up exceeding two S/G segments.  The chip expects one
         * segment for the request and another for the response.
         */
        cm->cm_max_segs = 2;

        cm->cm_desc.Default.RequestFlags = MPI2_REQ_DESCRIPT_FLAGS_DEFAULT_TYPE;
        cm->cm_complete = mpssas_smpio_complete;
        cm->cm_complete_data = ccb;

        /*
         * Tell the mapping code that we're using a uio, and that this is
         * an SMP passthrough request.  There is a little special-case
         * logic there (in mps_data_cb()) to handle the bidirectional
         * transfer.
         */
        cm->cm_flags |= MPS_CM_FLAGS_USE_UIO | MPS_CM_FLAGS_SMP_PASS |
                        MPS_CM_FLAGS_DATAIN | MPS_CM_FLAGS_DATAOUT;

        /* The chip data format is little endian. */
        req->SASAddress.High = htole32(sasaddr >> 32);
        req->SASAddress.Low = htole32(sasaddr);

        /*
         * XXX Note that we don't have a timeout/abort mechanism here.
         * From the manual, it looks like task management requests only
         * work for SCSI IO and SATA passthrough requests.  We may need to
         * have a mechanism to retry requests in the event of a chip reset
         * at least.  Hopefully the chip will insure that any errors short
         * of that are relayed back to the driver.
         */
        error = mps_map_command(sc, cm);
        if ((error != 0) && (error != EINPROGRESS)) {
                mps_printf(sc, "%s: error %d returned from mps_map_command()\n",
                           __func__, error);
                goto bailout_error;
        }

        return;

bailout_error:
        mps_free_command(sc, cm);
        ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
        xpt_done(ccb);
        return;

}

static void
mpssas_action_smpio(struct mpssas_softc *sassc, union ccb *ccb)
{
        struct mps_softc *sc;
        struct mpssas_target *targ;
        uint64_t sasaddr = 0;

        sc = sassc->sc;

        /*
         * Make sure the target exists.
         */
        targ = &sassc->targets[ccb->ccb_h.target_id];
        if (targ->handle == 0x0) {
                mps_printf(sc, "%s: target %d does not exist!\n", __func__,
                           ccb->ccb_h.target_id);
                ccb->ccb_h.status = CAM_SEL_TIMEOUT;
                xpt_done(ccb);
                return;
        }

        /*
         * If this device has an embedded SMP target, we'll talk to it
         * directly.
         * figure out what the expander's address is.
         */
        if ((targ->devinfo & MPI2_SAS_DEVICE_INFO_SMP_TARGET) != 0)
                sasaddr = targ->sasaddr;

        /*
         * If we don't have a SAS address for the expander yet, try
         * grabbing it from the page 0x83 information cached in the
         * transport layer for this target.  LSI expanders report the
         * expander SAS address as the port-associated SAS address in
         * Inquiry VPD page 0x83.  Maxim expanders don't report it in page
         * 0x83.
         *
         * XXX KDM disable this for now, but leave it commented out so that
         * it is obvious that this is another possible way to get the SAS
         * address.
         *
         * The parent handle method below is a little more reliable, and
         * the other benefit is that it works for devices other than SES
         * devices.  So you can send a SMP request to a da(4) device and it
         * will get routed to the expander that device is attached to.
         * (Assuming the da(4) device doesn't contain an SMP target...)
         */
#if 0
        if (sasaddr == 0)
                sasaddr = xpt_path_sas_addr(ccb->ccb_h.path);
#endif

        /*
         * If we still don't have a SAS address for the expander, look for
         * the parent device of this device, which is probably the expander.
         */
        if (sasaddr == 0) {
#ifdef OLD_MPS_PROBE
                struct mpssas_target *parent_target;
#endif

                if (targ->parent_handle == 0x0) {
                        mps_printf(sc, "%s: handle %d does not have a valid "
                                   "parent handle!\n", __func__, targ->handle);
                        ccb->ccb_h.status = CAM_REQ_INVALID;
                        goto bailout;
                }
#ifdef OLD_MPS_PROBE
                parent_target = mpssas_find_target_by_handle(sassc, 0,
                        targ->parent_handle);

                if (parent_target == NULL) {
                        mps_printf(sc, "%s: handle %d does not have a valid "
                                   "parent target!\n", __func__, targ->handle);
                        ccb->ccb_h.status = CAM_REQ_INVALID;
                        goto bailout;
                }

                if ((parent_target->devinfo &
                     MPI2_SAS_DEVICE_INFO_SMP_TARGET) == 0) {
                        mps_printf(sc, "%s: handle %d parent %d does not "
                                   "have an SMP target!\n", __func__,
                                   targ->handle, parent_target->handle);
                        ccb->ccb_h.status = CAM_REQ_INVALID;
                        goto bailout;

                }

                sasaddr = parent_target->sasaddr;
#else /* OLD_MPS_PROBE */
                if ((targ->parent_devinfo &
                     MPI2_SAS_DEVICE_INFO_SMP_TARGET) == 0) {
                        mps_printf(sc, "%s: handle %d parent %d does not "
                                   "have an SMP target!\n", __func__,
                                   targ->handle, targ->parent_handle);
                        ccb->ccb_h.status = CAM_REQ_INVALID;
                        goto bailout;

                }
                if (targ->parent_sasaddr == 0x0) {
                        mps_printf(sc, "%s: handle %d parent handle %d does "
                                   "not have a valid SAS address!\n",
                                   __func__, targ->handle, targ->parent_handle);
                        ccb->ccb_h.status = CAM_REQ_INVALID;
                        goto bailout;
                }

                sasaddr = targ->parent_sasaddr;
#endif /* OLD_MPS_PROBE */

        }

        if (sasaddr == 0) {
                mps_printf(sc, "%s: unable to find SAS address for handle %d\n",
                           __func__, targ->handle);
                ccb->ccb_h.status = CAM_REQ_INVALID;
                goto bailout;
        }
        mpssas_send_smpcmd(sassc, ccb, sasaddr);

        return;

bailout:
        xpt_done(ccb);

}
#endif //__FreeBSD_version >= 900026

static void
mpssas_action_resetdev(struct mpssas_softc *sassc, union ccb *ccb)
{
        MPI2_SCSI_TASK_MANAGE_REQUEST *req;
        struct mps_softc *sc;
        struct mps_command *tm;
        struct mpssas_target *targ;

        mps_dprint(sassc->sc, MPS_TRACE, __func__);
        KKASSERT(lockstatus(&sassc->sc->mps_lock, curthread) != 0);

        sc = sassc->sc;
        tm = mps_alloc_command(sc);
        if (tm == NULL) {
                mps_printf(sc, "command alloc failure in mpssas_action_resetdev\n");
                ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
                xpt_done(ccb);
                return;
        }

        targ = &sassc->targets[ccb->ccb_h.target_id];
        req = (MPI2_SCSI_TASK_MANAGE_REQUEST *)tm->cm_req;
        req->DevHandle = targ->handle;
        req->Function = MPI2_FUNCTION_SCSI_TASK_MGMT;
        req->TaskType = MPI2_SCSITASKMGMT_TASKTYPE_TARGET_RESET;

        /* SAS Hard Link Reset / SATA Link Reset */
        req->MsgFlags = MPI2_SCSITASKMGMT_MSGFLAGS_LINK_RESET;

        tm->cm_data = NULL;
        tm->cm_desc.HighPriority.RequestFlags = MPI2_REQ_DESCRIPT_FLAGS_HIGH_PRIORITY;
        tm->cm_complete = mpssas_resetdev_complete;
        tm->cm_complete_data = ccb;
        mps_map_command(sc, tm);
}

static void
mpssas_resetdev_complete(struct mps_softc *sc, struct mps_command *tm)
{
        MPI2_SCSI_TASK_MANAGE_REPLY *resp;
        union ccb *ccb;

        mps_dprint(sc, MPS_TRACE, __func__);
        KKASSERT(lockstatus(&sc->mps_lock, curthread) != 0);

        resp = (MPI2_SCSI_TASK_MANAGE_REPLY *)tm->cm_reply;
        ccb = tm->cm_complete_data;

        /*
         * Currently there should be no way we can hit this case.  It only
         * happens when we have a failure to allocate chain frames, and
         * task management commands don't have S/G lists.
         */
        if ((tm->cm_flags & MPS_CM_FLAGS_ERROR_MASK) != 0) {
                MPI2_SCSI_TASK_MANAGE_REQUEST *req;

                req = (MPI2_SCSI_TASK_MANAGE_REQUEST *)tm->cm_req;

                mps_printf(sc, "%s: cm_flags = %#x for reset of handle %#04x! "
                           "This should not happen!\n", __func__, tm->cm_flags,
                           req->DevHandle);
                ccb->ccb_h.status = CAM_REQ_CMP_ERR;
                goto bailout;
        }

        kprintf("%s: IOCStatus = 0x%x ResponseCode = 0x%x\n", __func__,
            resp->IOCStatus, resp->ResponseCode);

        if (resp->ResponseCode == MPI2_SCSITASKMGMT_RSP_TM_COMPLETE) {
                ccb->ccb_h.status = CAM_REQ_CMP;
                mpssas_announce_reset(sc, AC_SENT_BDR, tm->cm_targ->tid,
                    CAM_LUN_WILDCARD);
        }
        else
                ccb->ccb_h.status = CAM_REQ_CMP_ERR;

bailout:

        mpssas_free_tm(sc, tm);
        xpt_done(ccb);
}

static void
mpssas_poll(struct cam_sim *sim)
{
        struct mpssas_softc *sassc;

        sassc = cam_sim_softc(sim);

        if (sassc->sc->mps_debug & MPS_TRACE) {
                /* frequent debug messages during a panic just slow
                 * everything down too much.
                 */
                mps_printf(sassc->sc, "%s clearing MPS_TRACE\n", __func__);
                sassc->sc->mps_debug &= ~MPS_TRACE;
        }

        mps_intr_locked(sassc->sc);
}

static void
mpssas_rescan_done(struct cam_periph *periph, union ccb *done_ccb)
{
        struct mpssas_softc *sassc;
        char path_str[64];

        if (done_ccb == NULL)
                return;

        sassc = (struct mpssas_softc *)done_ccb->ccb_h.ppriv_ptr1;

        KKASSERT(lockstatus(&sassc->sc->mps_lock, curthread) != 0);

        xpt_path_string(done_ccb->ccb_h.path, path_str, sizeof(path_str));
        mps_dprint(sassc->sc, MPS_INFO, "Completing rescan for %s\n", path_str);

        xpt_free_path(done_ccb->ccb_h.path);
        xpt_free_ccb(done_ccb);

#if __FreeBSD_version < 1000006
        /*
         * Before completing scan, get EEDP stuff for all of the existing
         * targets.
         */
        mpssas_check_eedp(sassc);
#endif

}

/* thread to handle bus rescans */
static void
mpssas_scanner_thread(void *arg)
{
        struct mpssas_softc *sassc;
        struct mps_softc *sc;
        union ccb       *ccb;

        sassc = (struct mpssas_softc *)arg;
        sc = sassc->sc;

        mps_dprint(sc, MPS_TRACE, "%s\n", __func__);

        mps_lock(sc);
        for (;;) {
                lksleep(&sassc->ccb_scanq, &sc->mps_lock, 0, "mps_scanq", 0);
                if (sassc->flags & MPSSAS_SHUTDOWN) {
                        mps_dprint(sc, MPS_TRACE, "Scanner shutting down\n");
                        break;
                }
                ccb = (union ccb *)TAILQ_FIRST(&sassc->ccb_scanq);
                if (ccb == NULL)
                        continue;
                TAILQ_REMOVE(&sassc->ccb_scanq, &ccb->ccb_h, sim_links.tqe);
                xpt_action(ccb);
        }

        sassc->flags &= ~MPSSAS_SCANTHREAD;
        wakeup(&sassc->flags);
        mps_unlock(sc);
        mps_dprint(sc, MPS_TRACE, "Scanner exiting\n");
        mps_kproc_exit(0);
}

static void
mpssas_rescan(struct mpssas_softc *sassc, union ccb *ccb)
{
        char path_str[64];

        mps_dprint(sassc->sc, MPS_TRACE, "%s\n", __func__);

        KKASSERT(lockstatus(&sassc->sc->mps_lock, curthread) != 0);

        if (ccb == NULL)
                return;

        xpt_path_string(ccb->ccb_h.path, path_str, sizeof(path_str));
        mps_dprint(sassc->sc, MPS_INFO, "Queueing rescan for %s\n", path_str);

        /* Prepare request */
        ccb->ccb_h.ppriv_ptr1 = sassc;
        ccb->ccb_h.cbfcnp = mpssas_rescan_done;
        xpt_setup_ccb(&ccb->ccb_h, ccb->ccb_h.path, MPS_PRIORITY_XPT);
        TAILQ_INSERT_TAIL(&sassc->ccb_scanq, &ccb->ccb_h, sim_links.tqe);
        wakeup(&sassc->ccb_scanq);
}

#if __FreeBSD_version >= 1000006
static void
mpssas_async(void *callback_arg, uint32_t code, struct cam_path *path,
             void *arg)
{
        struct mps_softc *sc;

        sc = (struct mps_softc *)callback_arg;

        switch (code) {
        case AC_ADVINFO_CHANGED: {
                struct mpssas_target *target;
                struct mpssas_softc *sassc;
                struct scsi_read_capacity_data_long rcap_buf;
                struct ccb_dev_advinfo cdai;
                struct mpssas_lun *lun;
                lun_id_t lunid;
                int found_lun;
                uintptr_t buftype;

                buftype = (uintptr_t)arg;

                found_lun = 0;
                sassc = sc->sassc;

                /*
                 * We're only interested in read capacity data changes.
                 */
                if (buftype != CDAI_TYPE_RCAPLONG)
                        break;

                /*
                 * We're only interested in devices that are attached to
                 * this controller.
                 */
                if (xpt_path_path_id(path) != sassc->sim->path_id)
                        break;

                /*
                 * We should have a handle for this, but check to make sure.
                 */
                target = &sassc->targets[xpt_path_target_id(path)];
                if (target->handle == 0)
                        break;

                lunid = xpt_path_lun_id(path);

                SLIST_FOREACH(lun, &target->luns, lun_link) {
                        if (lun->lun_id == lunid) {
                                found_lun = 1;
                                break;
                        }
                }

                if (found_lun == 0) {
                        lun = kmalloc(sizeof(struct mpssas_lun), M_MPT2,
                                     M_NOWAIT | M_ZERO);
                        if (lun == NULL) {
                                mps_dprint(sc, MPS_FAULT, "Unable to alloc "
                                           "LUN for EEDP support.\n");
                                break;
                        }
                        lun->lun_id = lunid;
                        SLIST_INSERT_HEAD(&target->luns, lun, lun_link);
                }

                bzero(&rcap_buf, sizeof(rcap_buf));
                xpt_setup_ccb(&cdai.ccb_h, path, CAM_PRIORITY_NORMAL);
                cdai.ccb_h.func_code = XPT_DEV_ADVINFO;
                cdai.ccb_h.flags = CAM_DIR_IN;
                cdai.buftype = CDAI_TYPE_RCAPLONG;
                cdai.flags = 0;
                cdai.bufsiz = sizeof(rcap_buf);
                cdai.buf = (uint8_t *)&rcap_buf;
                xpt_action((union ccb *)&cdai);
                if ((cdai.ccb_h.status & CAM_DEV_QFRZN) != 0)
                        cam_release_devq(cdai.ccb_h.path,
                                         0, 0, 0, FALSE);

                if (((cdai.ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP)
                 && (rcap_buf.prot & SRC16_PROT_EN)) {
                        lun->eedp_formatted = TRUE;
                        lun->eedp_block_size = scsi_4btoul(rcap_buf.length);
                } else {
                        lun->eedp_formatted = FALSE;
                        lun->eedp_block_size = 0;
                }
                break;
        }
        default:
                break;
        }
}
#else /* __FreeBSD_version >= 1000006 */

static void
mpssas_check_eedp(struct mpssas_softc *sassc)
{
        struct mps_softc *sc = sassc->sc;
        struct ccb_scsiio *csio;
        struct scsi_read_capacity_16 *scsi_cmd;
        struct scsi_read_capacity_eedp *rcap_buf;
        union ccb *ccb;
        path_id_t pathid = cam_sim_path(sassc->sim);
        target_id_t targetid;
        lun_id_t lunid;
        struct cam_periph *found_periph;
        struct mpssas_target *target;
        struct mpssas_lun *lun;
        uint8_t found_lun;

        /*
         * Issue a READ CAPACITY 16 command to each LUN of each target.  This
         * info is used to determine if the LUN is formatted for EEDP support.
         */
        for (targetid = 0; targetid < sc->facts->MaxTargets; targetid++) {
                target = &sassc->targets[targetid];
                if (target->handle == 0x0) {
                        continue;
                }

                lunid = 0;
                do {
                        rcap_buf =
                            kmalloc(sizeof(struct scsi_read_capacity_eedp),
                            M_MPT2, M_NOWAIT | M_ZERO);
                        if (rcap_buf == NULL) {
                                mps_dprint(sc, MPS_FAULT, "Unable to alloc read "
                                    "capacity buffer for EEDP support.\n");
                                return;
                        }

                        ccb = kmalloc(sizeof(union ccb), M_TEMP,
                            M_WAITOK | M_ZERO);

                        if (xpt_create_path(&ccb->ccb_h.path, xpt_periph,
                            pathid, targetid, lunid) != CAM_REQ_CMP) {
                                mps_dprint(sc, MPS_FAULT, "Unable to create "
                                    "path for EEDP support\n");
                                kfree(rcap_buf, M_MPT2);
                                xpt_free_ccb(ccb);
                                return;
                        }

                        /*
                         * If a periph is returned, the LUN exists.  Create an
                         * entry in the target's LUN list.
                         */
                        if ((found_periph = cam_periph_find(ccb->ccb_h.path,
                            NULL)) != NULL) {
                                /*
                                 * If LUN is already in list, don't create a new
                                 * one.
                                 */
                                found_lun = FALSE;
                                SLIST_FOREACH(lun, &target->luns, lun_link) {
                                        if (lun->lun_id == lunid) {
                                                found_lun = TRUE;
                                                break;
                                        }
                                }
                                if (!found_lun) {
                                        lun = kmalloc(sizeof(struct mpssas_lun),
                                            M_MPT2, M_WAITOK | M_ZERO);
                                        lun->lun_id = lunid;
                                        SLIST_INSERT_HEAD(&target->luns, lun,
                                            lun_link);
                                }
                                lunid++;

                                /*
                                 * Issue a READ CAPACITY 16 command for the LUN.
                                 * The mpssas_read_cap_done function will load
                                 * the read cap info into the LUN struct.
                                 */
                                csio = &ccb->csio;
                                csio->ccb_h.func_code = XPT_SCSI_IO;
                                csio->ccb_h.flags = CAM_DIR_IN;
                                csio->ccb_h.retry_count = 4;
                                csio->ccb_h.cbfcnp = mpssas_read_cap_done;
                                csio->ccb_h.timeout = 60000;
                                csio->data_ptr = (uint8_t *)rcap_buf;
                                csio->dxfer_len = sizeof(struct
                                    scsi_read_capacity_eedp);
                                csio->sense_len = MPS_SENSE_LEN;
                                csio->cdb_len = sizeof(*scsi_cmd);
                                csio->tag_action = MSG_SIMPLE_Q_TAG;

                                scsi_cmd = (struct scsi_read_capacity_16 *)
                                    &csio->cdb_io.cdb_bytes;
                                bzero(scsi_cmd, sizeof(*scsi_cmd));
                                scsi_cmd->opcode = 0x9E;
                                scsi_cmd->service_action = SRC16_SERVICE_ACTION;
                                ((uint8_t *)scsi_cmd)[13] = sizeof(struct
                                    scsi_read_capacity_eedp);

                                /*
                                 * Set the path, target and lun IDs for the READ
                                 * CAPACITY request.
                                 */
                                ccb->ccb_h.path_id =
                                    xpt_path_path_id(ccb->ccb_h.path);
                                ccb->ccb_h.target_id =
                                    xpt_path_target_id(ccb->ccb_h.path);
                                ccb->ccb_h.target_lun =
                                    xpt_path_lun_id(ccb->ccb_h.path);

                                ccb->ccb_h.ppriv_ptr1 = sassc;
                                xpt_action(ccb);
                        } else {
                                kfree(rcap_buf, M_MPT2);
                                xpt_free_path(ccb->ccb_h.path);
                                xpt_free_ccb(ccb);
                        }
                } while (found_periph);
        }
}


static void
mpssas_read_cap_done(struct cam_periph *periph, union ccb *done_ccb)
{
        struct mpssas_softc *sassc;
        struct mpssas_target *target;
        struct mpssas_lun *lun;
        struct scsi_read_capacity_eedp *rcap_buf;

        if (done_ccb == NULL)
                return;

        rcap_buf = (struct scsi_read_capacity_eedp *)done_ccb->csio.data_ptr;

        /*
         * Get the LUN ID for the path and look it up in the LUN list for the
         * target.
         */
        sassc = (struct mpssas_softc *)done_ccb->ccb_h.ppriv_ptr1;
        target = &sassc->targets[done_ccb->ccb_h.target_id];
        SLIST_FOREACH(lun, &target->luns, lun_link) {
                if (lun->lun_id != done_ccb->ccb_h.target_lun)
                        continue;

                /*
                 * Got the LUN in the target's LUN list.  Fill it in
                 * with EEDP info.  If the READ CAP 16 command had some
                 * SCSI error (common if command is not supported), mark
                 * the lun as not supporting EEDP and set the block size
                 * to 0.
                 */
                if (((done_ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP)
                 || (done_ccb->csio.scsi_status != SCSI_STATUS_OK)) {
                        lun->eedp_formatted = FALSE;
                        lun->eedp_block_size = 0;
                        break;
                }

                if (rcap_buf->protect & 0x01) {
                        lun->eedp_formatted = TRUE;
                        lun->eedp_block_size = scsi_4btoul(rcap_buf->length);
                }
                break;
        }

        // Finished with this CCB and path.
        kfree(rcap_buf, M_MPT2);
        xpt_free_path(done_ccb->ccb_h.path);
        xpt_free_ccb(done_ccb);
}
#endif /* __FreeBSD_version >= 1000006 */

int
mpssas_startup(struct mps_softc *sc)
{
        struct mpssas_softc *sassc;

        /*
         * Send the port enable message and set the wait_for_port_enable flag.
         * This flag helps to keep the simq frozen until all discovery events
         * are processed.
         */
        sassc = sc->sassc;
        mpssas_startup_increment(sassc);
        sc->wait_for_port_enable = 1;
        mpssas_send_portenable(sc);
        return (0);
}

static int
mpssas_send_portenable(struct mps_softc *sc)
{
        MPI2_PORT_ENABLE_REQUEST *request;
        struct mps_command *cm;

        mps_dprint(sc, MPS_TRACE, "%s\n", __func__);

        if ((cm = mps_alloc_command(sc)) == NULL)
                return (EBUSY);
        request = (MPI2_PORT_ENABLE_REQUEST *)cm->cm_req;
        request->Function = MPI2_FUNCTION_PORT_ENABLE;
        request->MsgFlags = 0;
        request->VP_ID = 0;
        cm->cm_desc.Default.RequestFlags = MPI2_REQ_DESCRIPT_FLAGS_DEFAULT_TYPE;
        cm->cm_complete = mpssas_portenable_complete;
        cm->cm_data = NULL;
        cm->cm_sge = NULL;

        mps_map_command(sc, cm);
        mps_dprint(sc, MPS_TRACE,
            "mps_send_portenable finished cm %p req %p complete %p\n",
            cm, cm->cm_req, cm->cm_complete);
        return (0);
}

static void
mpssas_portenable_complete(struct mps_softc *sc, struct mps_command *cm)
{
        MPI2_PORT_ENABLE_REPLY *reply;
        struct mpssas_softc *sassc;
        struct mpssas_target *target;
        int i;

        mps_dprint(sc, MPS_TRACE, "%s\n", __func__);
        sassc = sc->sassc;

        /*
         * Currently there should be no way we can hit this case.  It only
         * happens when we have a failure to allocate chain frames, and
         * port enable commands don't have S/G lists.
         */
        if ((cm->cm_flags & MPS_CM_FLAGS_ERROR_MASK) != 0) {
                mps_printf(sc, "%s: cm_flags = %#x for port enable! "
                           "This should not happen!\n", __func__, cm->cm_flags);
        }

        reply = (MPI2_PORT_ENABLE_REPLY *)cm->cm_reply;
        if (reply == NULL)
                mps_dprint(sc, MPS_FAULT, "Portenable NULL reply\n");
        else if ((reply->IOCStatus & MPI2_IOCSTATUS_MASK) !=
            MPI2_IOCSTATUS_SUCCESS)
                mps_dprint(sc, MPS_FAULT, "Portenable failed\n");

        mps_free_command(sc, cm);
        if (sc->mps_ich.ich_arg != NULL) {
                mps_dprint(sc, MPS_INFO, "disestablish config intrhook\n");
                config_intrhook_disestablish(&sc->mps_ich);
                sc->mps_ich.ich_arg = NULL;
        }

        /*
         * Get WarpDrive info after discovery is complete but before the scan
         * starts.  At this point, all devices are ready to be exposed to the
         * OS.  If devices should be hidden instead, take them out of the
         * 'targets' array before the scan.  The devinfo for a disk will have
         * some info and a volume's will be 0.  Use that to remove disks.
         */
        mps_wd_config_pages(sc);
        if (((sc->mps_flags & MPS_FLAGS_WD_AVAILABLE)
          && (sc->WD_hide_expose == MPS_WD_HIDE_ALWAYS))
         || (sc->WD_valid_config && (sc->WD_hide_expose ==
            MPS_WD_HIDE_IF_VOLUME))) {
                for (i = 0; i < sassc->sc->facts->MaxTargets; i++) {
                        target = &sassc->targets[i];
                        if (target->devinfo) {
                                target->devinfo = 0x0;
                                target->encl_handle = 0x0;
                                target->encl_slot = 0x0;
                                target->handle = 0x0;
                                target->tid = 0x0;
                                target->linkrate = 0x0;
                                target->flags = 0x0;
                        }
                }
        }

        /*
         * Done waiting for port enable to complete.  Decrement the refcount.
         * If refcount is 0, discovery is complete and a rescan of the bus can
         * take place.  Since the simq was explicitly frozen before port
         * enable, it must be explicitly released here to keep the
         * freeze/release count in sync.
         */
        sc->wait_for_port_enable = 0;
        sc->port_enable_complete = 1;
        mpssas_startup_decrement(sassc);
        xpt_release_simq(sassc->sim, 1);
}