Merge bmake-20201117

[FreeBSD/FreeBSD.git] / sys / dev / mps / mps_sas.c

/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2009 Yahoo! Inc.
 * Copyright (c) 2011-2015 LSI Corp.
 * Copyright (c) 2013-2015 Avago Technologies
 * 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.
 *
 * Avago Technologies (LSI) MPT-Fusion Host Adapter FreeBSD
 *
 * $FreeBSD$
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

/* Communications core for Avago Technologies (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/selinfo.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/conf.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 <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>

#include <machine/stdarg.h>

#include <cam/cam.h>
#include <cam/cam_ccb.h>
#include <cam/cam_xpt.h>
#include <cam/cam_debug.h>
#include <cam/cam_sim.h>
#include <cam/cam_xpt_sim.h>
#include <cam/cam_xpt_periph.h>
#include <cam/cam_periph.h>
#include <cam/scsi/scsi_all.h>
#include <cam/scsi/scsi_message.h>
#include <cam/scsi/smp_all.h>

#include <dev/mps/mpi/mpi2_type.h>
#include <dev/mps/mpi/mpi2.h>
#include <dev/mps/mpi/mpi2_ioc.h>
#include <dev/mps/mpi/mpi2_sas.h>
#include <dev/mps/mpi/mpi2_cnfg.h>
#include <dev/mps/mpi/mpi2_init.h>
#include <dev/mps/mpi/mpi2_tool.h>
#include <dev/mps/mps_ioctl.h>
#include <dev/mps/mpsvar.h>
#include <dev/mps/mps_table.h>
#include <dev/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 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 int mpssas_send_abort(struct mps_softc *sc, struct mps_command *tm,
    struct mps_command *cm);
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 *);
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);
static void mpssas_resetdev_complete(struct mps_softc *, struct mps_command *);
static void mpssas_async(void *callback_arg, uint32_t code,
                         struct cam_path *path, void *arg);
static int mpssas_send_portenable(struct mps_softc *sc);
static void mpssas_portenable_complete(struct mps_softc *sc,
    struct mps_command *cm);

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->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)
{
        MPS_FUNCTRACE(sassc->sc);

        if ((sassc->flags & MPSSAS_IN_STARTUP) != 0) {
                if (sassc->startup_refcount++ == 0) {
                        /* just starting, freeze the simq */
                        mps_dprint(sassc->sc, MPS_INIT,
                            "%s freezing simq\n", __func__);
                        xpt_hold_boot();
                        xpt_freeze_simq(sassc->sim, 1);
                }
                mps_dprint(sassc->sc, MPS_INIT, "%s refcount %u\n", __func__,
                    sassc->startup_refcount);
        }
}

void
mpssas_release_simq_reinit(struct mpssas_softc *sassc)
{
        if (sassc->flags & MPSSAS_QUEUE_FROZEN) {
                sassc->flags &= ~MPSSAS_QUEUE_FROZEN;
                xpt_release_simq(sassc->sim, 1);
                mps_dprint(sassc->sc, MPS_INFO, "Unfreezing SIM queue\n");
        }
}

void
mpssas_startup_decrement(struct mpssas_softc *sassc)
{
        MPS_FUNCTRACE(sassc->sc);

        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_INIT,
                            "%s releasing simq\n", __func__);
                        sassc->flags &= ~MPSSAS_IN_STARTUP;
                        xpt_release_simq(sassc->sim, 1);
                        xpt_release_boot();
                }
                mps_dprint(sassc->sc, MPS_INIT, "%s refcount %u\n", __func__,
                    sassc->startup_refcount);
        }
}

/*
 * The firmware requires us to stop sending commands when we're doing task
 * management.
 * XXX The logic for serializing the device has been made lazy and moved to
 * mpssas_prepare_for_tm().
 */
struct mps_command *
mpssas_alloc_tm(struct mps_softc *sc)
{
        MPI2_SCSI_TASK_MANAGE_REQUEST *req;
        struct mps_command *tm;

        tm = mps_alloc_high_priority_command(sc);
        if (tm == NULL)
                return (NULL);

        req = (MPI2_SCSI_TASK_MANAGE_REQUEST *)tm->cm_req;
        req->Function = MPI2_FUNCTION_SCSI_TASK_MGMT;
        return tm;
}

void
mpssas_free_tm(struct mps_softc *sc, struct mps_command *tm)
{
        int target_id = 0xFFFFFFFF;

        if (tm == NULL)
                return;

        /*
         * For TM's the devq is frozen for the device.  Unfreeze it here and
         * free the resources used for freezing the devq.  Must clear the
         * INRESET flag as well or scsi I/O will not work.
         */
        if (tm->cm_targ != NULL) {
                tm->cm_targ->flags &= ~MPSSAS_TARGET_INRESET;
                target_id = tm->cm_targ->tid;
        }
        if (tm->cm_ccb) {
                mps_dprint(sc, MPS_INFO, "Unfreezing devq for target ID %d\n",
                    target_id);
                xpt_release_devq(tm->cm_ccb->ccb_h.path, 1, TRUE);
                xpt_free_path(tm->cm_ccb->ccb_h.path);
                xpt_free_ccb(tm->cm_ccb);
        }

        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;

        MPS_FUNCTRACE(sc);
        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 = xpt_alloc_ccb_nowait();
        if (ccb == NULL) {
                mps_dprint(sc, MPS_ERROR, "unable to alloc CCB for rescan\n");
                return;
        }

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

        if (targetid == CAM_TARGET_WILDCARD)
                ccb->ccb_h.func_code = XPT_SCAN_BUS;
        else
                ccb->ccb_h.func_code = XPT_SCAN_TGT;     

        mps_dprint(sc, MPS_TRACE, "%s targetid %u\n", __func__, targetid);
        xpt_rescan(ccb);
}

static void
mpssas_log_command(struct mps_command *cm, u_int level, const char *fmt, ...)
{
        struct sbuf sb;
        va_list ap;
        char str[224];
        char path_str[64];

        if (cm == NULL)
                return;

        /* No need to be in here if debugging isn't enabled */
        if ((cm->cm_sc->mps_debug & level) == 0)
                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);
        mps_print_field(cm->cm_sc, "%s", sbuf_data(&sb));

        va_end(ap);
}

static void
mpssas_remove_volume(struct mps_softc *sc, struct mps_command *tm)
{
        MPI2_SCSI_TASK_MANAGE_REPLY *reply;
        struct mpssas_target *targ;
        uint16_t handle;

        MPS_FUNCTRACE(sc);

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

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

        if ((le16toh(reply->IOCStatus) & MPI2_IOCSTATUS_MASK) !=
            MPI2_IOCSTATUS_SUCCESS) {
                mps_dprint(sc, MPS_ERROR,
                   "IOCStatus = 0x%x while resetting device 0x%x\n",
                   le16toh(reply->IOCStatus), handle);
        }

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

        mps_dprint(sc, MPS_XINFO,
            "clearing target %u handle 0x%04x\n", targ->tid, handle);

        /*
         * 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 ((le16toh(reply->IOCStatus) & MPI2_IOCSTATUS_MASK) ==
            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;
                targ->flags = 0x0;
        }

        mpssas_free_tm(sc, tm);
}

/*
 * No Need to call "MPI2_SAS_OP_REMOVE_DEVICE" For Volume removal.
 * Otherwise Volume Delete is same as Bare Drive Removal.
 */
void
mpssas_prepare_volume_remove(struct mpssas_softc *sassc, uint16_t handle)
{
        MPI2_SCSI_TASK_MANAGE_REQUEST *req;
        struct mps_softc *sc;
        struct mps_command *tm;
        struct mpssas_target *targ = NULL;

        MPS_FUNCTRACE(sassc->sc);
        sc = sassc->sc;

#ifdef WD_SUPPORT
        /*
         * 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.
         */
        if (sc->WD_available && (sc->WD_hide_expose ==
            MPS_WD_EXPOSE_ALWAYS)) {
                return;
        }
#endif //WD_SUPPORT

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

        targ->flags |= MPSSAS_TARGET_INREMOVAL;

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

        mpssas_rescan_target(sc, targ);

        req = (MPI2_SCSI_TASK_MANAGE_REQUEST *)tm->cm_req;
        req->DevHandle = targ->handle;
        req->TaskType = MPI2_SCSITASKMGMT_TASKTYPE_TARGET_RESET;

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

        tm->cm_targ = targ;
        tm->cm_data = NULL;
        tm->cm_complete = mpssas_remove_volume;
        tm->cm_complete_data = (void *)(uintptr_t)handle;

        mps_dprint(sc, MPS_INFO, "%s: Sending reset for target ID %d\n",
            __func__, targ->tid);
        mpssas_prepare_for_tm(sc, tm, targ, CAM_LUN_WILDCARD);

        mps_map_command(sc, tm);
}

/*
 * 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_FUNCTRACE(sassc->sc);

        sc = sassc->sc;

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

        targ->flags |= MPSSAS_TARGET_INREMOVAL;

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

        mpssas_rescan_target(sc, targ);

        req = (MPI2_SCSI_TASK_MANAGE_REQUEST *)cm->cm_req;
        req->DevHandle = htole16(targ->handle);
        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_complete = mpssas_remove_device;
        cm->cm_complete_data = (void *)(uintptr_t)handle;

        mps_dprint(sc, MPS_INFO, "%s: Sending reset for target ID %d\n",
            __func__, targ->tid);
        mpssas_prepare_for_tm(sc, cm, targ, CAM_LUN_WILDCARD);

        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;
        uint16_t handle;

        MPS_FUNCTRACE(sc);

        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_dprint(sc, MPS_ERROR,
                    "%s: cm_flags = %#x for remove of handle %#04x! "
                    "This should not happen!\n", __func__, tm->cm_flags,
                    handle);
        }

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

        if ((le16toh(reply->IOCStatus) & MPI2_IOCSTATUS_MASK) !=
            MPI2_IOCSTATUS_SUCCESS) {
                mps_dprint(sc, MPS_ERROR,
                   "IOCStatus = 0x%x while resetting device 0x%x\n",
                   le16toh(reply->IOCStatus), handle);
        }

        mps_dprint(sc, MPS_XINFO, "Reset aborted %u commands\n",
            le32toh(reply->TerminationCount));
        mps_free_reply(sc, tm->cm_reply_data);
        tm->cm_reply = NULL;    /* Ensures 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 = htole16(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;

        /*
         * Wait to send the REMOVE_DEVICE until all the commands have cleared.
         * They should be aborted or time out and we'll kick thus off there
         * if so.
         */
        if (TAILQ_FIRST(&targ->commands) == NULL) {
                mps_dprint(sc, MPS_INFO, "No pending commands: starting remove_device\n");
                mps_map_command(sc, tm);
                targ->pending_remove_tm = NULL;
        } else {
                targ->pending_remove_tm = tm;
        }

        mps_dprint(sc, MPS_XINFO, "clearing target %u handle 0x%04x\n",
                   targ->tid, handle);
}

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;
        struct mpssas_lun *lun;

        MPS_FUNCTRACE(sc);

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

        /*
         * At this point, we should have no pending commands for the target.
         * The remove target has just completed.
         */
        KASSERT(TAILQ_FIRST(&targ->commands) == NULL,
            ("%s: no commands should be pending\n", __func__));

        /*
         * 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_dprint(sc, MPS_XINFO,
                           "%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_dprint(sc, MPS_FAULT,
                    "%s NULL reply removing device 0x%04x\n", __func__, handle);
                mpssas_free_tm(sc, tm);
                return;
        }

        mps_dprint(sc, MPS_XINFO,
            "%s on handle 0x%04x, IOCStatus= 0x%x\n", __func__, 
            handle, le16toh(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 ((le16toh(reply->IOCStatus) & MPI2_IOCSTATUS_MASK) ==
            MPI2_IOCSTATUS_SUCCESS) {
                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;
                targ->flags = 0x0;
                
                while(!SLIST_EMPTY(&targ->luns)) {
                        lun = SLIST_FIRST(&targ->luns);
                        SLIST_REMOVE_HEAD(&targ->luns, lun_link);
                        free(lun, M_MPT2);
                }
        }

        mpssas_free_tm(sc, tm);
}

static int
mpssas_register_events(struct mps_softc *sc)
{
        u32 events[MPI2_EVENT_NOTIFY_EVENTMASK_WORDS];

        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;
        cam_status status;
        int unit, error = 0, reqs;

        MPS_FUNCTRACE(sc);
        mps_dprint(sc, MPS_INIT, "%s entered\n", __func__);

        sassc = malloc(sizeof(struct mpssas_softc), M_MPT2, M_WAITOK|M_ZERO);

        /*
         * XXX MaxTargets could change during a reinit.  Since we don't
         * resize the targets[] array during such an event, cache the value
         * of MaxTargets here so that we don't get into trouble later.  This
         * should move into the reinit logic.
         */
        sassc->maxtargets = sc->facts->MaxTargets + sc->facts->MaxVolumes;
        sassc->targets = malloc(sizeof(struct mpssas_target) *
            sassc->maxtargets, M_MPT2, M_WAITOK|M_ZERO);
        sc->sassc = sassc;
        sassc->sc = sc;

        reqs = sc->num_reqs - sc->num_prireqs - 1;
        if ((sassc->devq = cam_simq_alloc(reqs)) == NULL) {
                mps_dprint(sc, MPS_ERROR, "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_mtx, reqs, reqs, sassc->devq);
        if (sassc->sim == NULL) {
                mps_dprint(sc, MPS_INIT|MPS_ERROR, "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);
        taskqueue_start_threads(&sassc->ev_tq, 1, PRIBIO, "%s taskq", 
            device_get_nameunit(sc->mps_dev));

        mps_lock(sc);

        /*
         * 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, sc->mps_dev, 0)) != 0) {
                mps_dprint(sc, MPS_INIT|MPS_ERROR,
                    "Error %d registering SCSI bus\n", error);
                mps_unlock(sc);
                goto out;
        }

        /*
         * Assume that discovery events will start right away.
         *
         * Hold off boot until discovery is complete.
         */
        sassc->flags |= MPSSAS_IN_STARTUP | MPSSAS_IN_DISCOVERY;
        sc->sassc->startup_refcount = 0;
        mpssas_startup_increment(sassc);

        callout_init(&sassc->discovery_callout, 1 /*mpsafe*/);

        /*
         * Register for async events so we can determine the EEDP
         * capabilities of devices.
         */
        status = xpt_create_path(&sassc->path, /*periph*/NULL,
            cam_sim_path(sc->sassc->sim), CAM_TARGET_WILDCARD,
            CAM_LUN_WILDCARD);
        if (status != CAM_REQ_CMP) {
                mps_dprint(sc, MPS_ERROR|MPS_INIT,
                    "Error %#x creating sim path\n", status);
                sassc->path = NULL;
        } else {
                int event;

                event = AC_ADVINFO_CHANGED;
                status = xpt_register_async(event, mpssas_async, sc,
                                            sassc->path);
                if (status != CAM_REQ_CMP) {
                        mps_dprint(sc, MPS_ERROR,
                            "Error %#x registering async handler for "
                            "AC_ADVINFO_CHANGED events\n", status);
                        xpt_free_path(sassc->path);
                        sassc->path = NULL;
                }
        }
        if (status != CAM_REQ_CMP) {
                /*
                 * EEDP use is the exception, not the rule.
                 * Warn the user, but do not fail to attach.
                 */
                mps_printf(sc, "EEDP capabilities disabled.\n");
        }

        mps_unlock(sc);

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

        mps_dprint(sc, MPS_INIT, "%s exit error= %d\n", __func__, error);
        return (error);
}

int
mps_detach_sas(struct mps_softc *sc)
{
        struct mpssas_softc *sassc;
        struct mpssas_lun *lun, *lun_tmp;
        struct mpssas_target *targ;
        int i;

        MPS_FUNCTRACE(sc);

        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);

        while (sassc->startup_refcount != 0)
                mpssas_startup_decrement(sassc);

        /* Deregister our async handler */
        if (sassc->path != NULL) {
                xpt_register_async(0, mpssas_async, sc, sassc->path);
                xpt_free_path(sassc->path);
                sassc->path = NULL;
        }

        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, FALSE);
        }

        mps_unlock(sc);

        if (sassc->devq != NULL)
                cam_simq_free(sassc->devq);

        for(i=0; i< sassc->maxtargets ;i++) {
                targ = &sassc->targets[i];
                SLIST_FOREACH_SAFE(lun, &targ->luns, lun_link, lun_tmp) {
                        free(lun, M_MPT2);
                }
        }
        free(sassc->targets, M_MPT2);
        free(sassc, M_MPT2);
        sc->sassc = NULL;

        return (0);
}

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

        MPS_FUNCTRACE(sc);

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

        /*
         * After discovery has completed, check the mapping table for any
         * missing devices and update their missing counts. Only do this once
         * whenever the driver is initialized so that missing counts aren't
         * updated unnecessarily. Note that just because discovery has
         * completed doesn't mean that events have been processed yet. The
         * check_devices function is a callout timer that checks if ALL devices
         * are missing. If so, it will wait a little longer for events to
         * complete and keep resetting itself until some device in the mapping
         * table is not missing, meaning that event processing has started.
         */
        if (sc->track_mapping_events) {
                mps_dprint(sc, MPS_XINFO | MPS_MAPPING, "Discovery has "
                    "completed. Check for missing devices in the mapping "
                    "table.\n");
                callout_reset(&sc->device_check_callout,
                    MPS_MISSING_CHECK_DELAY * hz, mps_mapping_check_devices,
                    sc);
        }
}

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

        sassc = cam_sim_softc(sim);

        MPS_FUNCTRACE(sassc->sc);
        mps_dprint(sassc->sc, MPS_TRACE, "ccb func_code 0x%x\n",
            ccb->ccb_h.func_code);
        mtx_assert(&sassc->sc->mps_mtx, MA_OWNED);

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

                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 | PIM_UNMAPPED | PIM_NOSCAN;
                cpi->hba_eng_cnt = 0;
                cpi->max_target = sassc->maxtargets - 1;
                cpi->max_lun = 255;

                /*
                 * initiator_id is set here to an ID outside the set of valid
                 * target IDs (including volumes).
                 */
                cpi->initiator_id = sassc->maxtargets;
                strlcpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
                strlcpy(cpi->hba_vid, "Avago Tech", HBA_IDLEN);
                strlcpy(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;
                cpi->maxio = sc->maxio;
                mpssas_set_ccbstatus(ccb, 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;

                KASSERT(cts->ccb_h.target_id < sassc->maxtargets,
                    ("Target %d out of bounds in XPT_GET_TRANS_SETTINGS\n",
                    cts->ccb_h.target_id));
                targ = &sassc->targets[cts->ccb_h.target_id];
                if (targ->handle == 0x0) {
                        mpssas_set_ccbstatus(ccb, CAM_DEV_NOT_THERE);
                        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;

                mpssas_set_ccbstatus(ccb, CAM_REQ_CMP);
                break;
        }
        case XPT_CALC_GEOMETRY:
                cam_calc_geometry(&ccb->ccg, /*extended*/1);
                mpssas_set_ccbstatus(ccb, CAM_REQ_CMP);
                break;
        case XPT_RESET_DEV:
                mps_dprint(sassc->sc, MPS_XINFO, "mpssas_action XPT_RESET_DEV\n");
                mpssas_action_resetdev(sassc, ccb);
                return;
        case XPT_RESET_BUS:
        case XPT_ABORT:
        case XPT_TERM_IO:
                mps_dprint(sassc->sc, MPS_XINFO,
                    "mpssas_action faking success for abort or reset\n");
                mpssas_set_ccbstatus(ccb, CAM_REQ_CMP);
                break;
        case XPT_SCSI_IO:
                mpssas_action_scsiio(sassc, ccb);
                return;
        case XPT_SMP_IO:
                mpssas_action_smpio(sassc, ccb);
                return;
        default:
                mpssas_set_ccbstatus(ccb, 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_dprint(sc, MPS_XINFO, "%s code %x target %d lun %jx\n", __func__,
            ac_code, target_id, (uintmax_t)lun_id);

        if (xpt_create_path(&path, NULL, 
                path_id, target_id, lun_id) != CAM_REQ_CMP) {
                mps_dprint(sc, MPS_ERROR, "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_FUNCTRACE(sc);
        mtx_assert(&sc->mps_mtx, MA_OWNED);

        /* complete all commands with a NULL reply */
        for (i = 1; i < sc->num_reqs; i++) {
                cm = &sc->commands[i];
                if (cm->cm_state == MPS_CM_STATE_FREE)
                        continue;

                cm->cm_state = MPS_CM_STATE_BUSY;
                cm->cm_reply = NULL;
                completed = 0;

                if (cm->cm_flags & MPS_CM_FLAGS_SATA_ID_TIMEOUT) {
                        MPASS(cm->cm_data);
                        free(cm->cm_data, M_MPT2);
                        cm->cm_data = NULL;
                }

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

                if (cm->cm_complete != NULL) {
                        mpssas_log_command(cm, MPS_RECOVERY,
                            "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;
                } else if (cm->cm_flags & MPS_CM_FLAGS_WAKEUP) {
                        mpssas_log_command(cm, MPS_RECOVERY,
                            "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, MPS_RECOVERY,
                            "cm %p state %x flags 0x%x ccb %p during diag "
                            "reset\n", cm, cm->cm_state, cm->cm_flags,
                            cm->cm_ccb);
                }
        }

        sc->io_cmds_active = 0;
}

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_dprint(sc, MPS_INIT, "%s startup\n", __func__);
        sc->sassc->flags |= MPSSAS_IN_STARTUP;
        sc->sassc->flags |= MPSSAS_IN_DISCOVERY;
        mpssas_startup_increment(sc->sassc);

        /* 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_dprint(sc, MPS_INIT,
            "%s startup %u after command completion\n", __func__,
            sc->sassc->startup_refcount);

        /* 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->sassc->maxtargets; i++) {
                if (sc->sassc->targets[i].outstanding != 0)
                        mps_dprint(sc, MPS_INIT, "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;

        mtx_assert(&sc->mps_mtx, MA_OWNED);

        mpssas_log_command(tm, MPS_INFO|MPS_RECOVERY,
            "task mgmt %p timed out\n", tm);

        KASSERT(tm->cm_state == MPS_CM_STATE_INQUEUE,
            ("command not inqueue\n"));

        tm->cm_state = MPS_CM_STATE_BUSY;
        mps_reinit(sc);
}

static void
mpssas_logical_unit_reset_complete(struct mps_softc *sc, struct mps_command *tm)
{
        MPI2_SCSI_TASK_MANAGE_REPLY *reply;
        MPI2_SCSI_TASK_MANAGE_REQUEST *req;
        unsigned int cm_count = 0;
        struct mps_command *cm;
        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.
         * XXXSL So should it be an assertion?
         */
        if ((tm->cm_flags & MPS_CM_FLAGS_ERROR_MASK) != 0) {
                mps_dprint(sc, MPS_RECOVERY|MPS_ERROR,
                    "%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) {
                mps_dprint(sc, MPS_RECOVERY, "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 */
                        mps_dprint(sc, MPS_RECOVERY, "Hardware undergoing "
                            "reset, ignoring NULL LUN reset reply\n");
                        targ->tm = NULL;
                        mpssas_free_tm(sc, tm);
                }
                else {
                        /* we should have gotten a reply. */
                        mps_dprint(sc, MPS_INFO|MPS_RECOVERY, "NULL reply on "
                            "LUN reset attempt, resetting controller\n");
                        mps_reinit(sc);
                }
                return;
        }

        mps_dprint(sc, MPS_RECOVERY,
            "logical unit reset status 0x%x code 0x%x count %u\n",
            le16toh(reply->IOCStatus), le32toh(reply->ResponseCode),
            le32toh(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) {
                mps_dprint(sc, MPS_RECOVERY|MPS_INFO,
                    "Finished recovery after LUN reset for target %u\n",
                    targ->tid);

                mpssas_announce_reset(sc, AC_SENT_BDR, 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) {
                        mps_dprint(sc, MPS_INFO|MPS_RECOVERY,
                            "More commands to abort for target %u\n",
                            targ->tid);
                        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.
                 */
                mps_dprint(sc, MPS_INFO|MPS_RECOVERY,
                    "logical unit reset complete for target %u, but still "
                    "have %u command(s), sending target reset\n", targ->tid,
                    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;
        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) {
                mps_dprint(sc, MPS_ERROR,"%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) {
                mps_dprint(sc, MPS_RECOVERY,
                    "NULL target reset reply for tm %pi TaskMID %u\n",
                    tm, le16toh(req->TaskMID));
                if ((sc->mps_flags & MPS_FLAGS_DIAGRESET) != 0) {
                        /* this completion was due to a reset, just cleanup */
                        mps_dprint(sc, MPS_RECOVERY, "Hardware undergoing "
                            "reset, ignoring NULL target reset reply\n");
                        targ->tm = NULL;
                        mpssas_free_tm(sc, tm);
                } else {
                        /* we should have gotten a reply. */
                        mps_dprint(sc, MPS_INFO|MPS_RECOVERY, "NULL reply on "
                            "target reset attempt, resetting controller\n");
                        mps_reinit(sc);
                }
                return;
        }

        mps_dprint(sc, MPS_RECOVERY,
            "target reset status 0x%x code 0x%x count %u\n",
            le16toh(reply->IOCStatus), le32toh(reply->ResponseCode),
            le32toh(reply->TerminationCount));

        if (targ->outstanding == 0) {
                /* we've finished recovery for this target and all
                 * of its logical units.
                 */
                mps_dprint(sc, MPS_RECOVERY|MPS_INFO,
                    "Finished reset recovery for target %u\n", targ->tid);

                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.
                 */
                mps_dprint(sc, MPS_INFO|MPS_RECOVERY,
                    "Target reset complete for target %u, but still have %u "
                    "command(s), resetting controller\n", targ->tid,
                    targ->outstanding);
                mps_reinit(sc);
        }
}

#define MPS_RESET_TIMEOUT 30

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_dprint(sc, MPS_ERROR,"%s null devhandle for target_id %d\n",
                    __func__, target->tid);
                return -1;
        }

        req = (MPI2_SCSI_TASK_MANAGE_REQUEST *)tm->cm_req;
        req->DevHandle = htole16(target->handle);
        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++;
                mps_dprint(sc, MPS_RECOVERY|MPS_INFO,
                    "Sending logical unit reset to target %u lun %d\n",
                    target->tid, tm->cm_lun);
                tm->cm_complete = mpssas_logical_unit_reset_complete;
                mpssas_prepare_for_tm(sc, tm, target, tm->cm_lun);
        } 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++;
                mps_dprint(sc, MPS_RECOVERY|MPS_INFO,
                    "Sending target reset to target %u\n", target->tid);
                tm->cm_complete = mpssas_target_reset_complete;
                mpssas_prepare_for_tm(sc, tm, target, CAM_LUN_WILDCARD);
        } else {
                mps_dprint(sc, MPS_ERROR, "unexpected reset type 0x%x\n", type);
                return -1;
        }

        tm->cm_data = NULL;
        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)
                mps_dprint(sc, MPS_ERROR|MPS_RECOVERY,
                    "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) {
                mps_dprint(sc, MPS_RECOVERY,
                    "cm_flags = %#x for abort %p TaskMID %u!\n", 
                    tm->cm_flags, tm, le16toh(req->TaskMID));
                mpssas_free_tm(sc, tm);
                return;
        }

        if (reply == NULL) {
                mps_dprint(sc, MPS_RECOVERY,
                    "NULL abort reply for tm %p TaskMID %u\n", 
                    tm, le16toh(req->TaskMID));
                if ((sc->mps_flags & MPS_FLAGS_DIAGRESET) != 0) {
                        /* this completion was due to a reset, just cleanup */
                        mps_dprint(sc, MPS_RECOVERY, "Hardware undergoing "
                            "reset, ignoring NULL abort reply\n");
                        targ->tm = NULL;
                        mpssas_free_tm(sc, tm);
                } else {
                        /* we should have gotten a reply. */
                        mps_dprint(sc, MPS_INFO|MPS_RECOVERY, "NULL reply on "
                            "abort attempt, resetting controller\n");
                        mps_reinit(sc);
                }
                return;
        }

        mps_dprint(sc, MPS_RECOVERY,
            "abort TaskMID %u status 0x%x code 0x%x count %u\n",
            le16toh(req->TaskMID),
            le16toh(reply->IOCStatus), le32toh(reply->ResponseCode),
            le32toh(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.
                 */
                mps_dprint(sc, MPS_INFO|MPS_RECOVERY,
                    "Finished abort recovery for target %u\n", targ->tid);

                targ->tm = NULL;
                mpssas_free_tm(sc, tm);
        } else if (le16toh(req->TaskMID) != cm->cm_desc.Default.SMID) {
                /* abort success, but we have more timedout commands to abort */
                mps_dprint(sc, MPS_INFO|MPS_RECOVERY,
                    "Continuing abort recovery for target %u\n", targ->tid);
                
                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.
                 */
                mps_dprint(sc, MPS_RECOVERY,
                    "Abort failed for target %u, sending logical unit reset\n",
                    targ->tid);

                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_dprint(sc, MPS_ERROR|MPS_RECOVERY,
                    "%s null devhandle for target_id %d\n",
                    __func__, cm->cm_ccb->ccb_h.target_id);
                return -1;
        }

        mpssas_log_command(cm, MPS_RECOVERY|MPS_INFO,
            "Aborting command %p\n", cm);

        req = (MPI2_SCSI_TASK_MANAGE_REQUEST *)tm->cm_req;
        req->DevHandle = htole16(targ->handle);
        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 = htole16(cm->cm_desc.Default.SMID);

        tm->cm_data = NULL;
        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++;

        mpssas_prepare_for_tm(sc, tm, targ, tm->cm_lun);

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

static void
mpssas_scsiio_timeout(void *data)
{
        sbintime_t elapsed, now;
        union ccb *ccb;
        struct mps_softc *sc;
        struct mps_command *cm;
        struct mpssas_target *targ;

        cm = (struct mps_command *)data;
        sc = cm->cm_sc;
        ccb = cm->cm_ccb;
        now = sbinuptime();

        MPS_FUNCTRACE(sc);
        mtx_assert(&sc->mps_mtx, MA_OWNED);

        mps_dprint(sc, MPS_XINFO|MPS_RECOVERY, "Timeout checking cm %p\n", sc);

        /*
         * 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_flags & MPS_CM_FLAGS_ON_RECOVERY) {
                mpssas_log_command(cm, MPS_XINFO,
                    "SCSI command %p almost timed out\n", cm);
                return;
        }

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

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

        elapsed = now - ccb->ccb_h.qos.sim_data;
        mpssas_log_command(cm, MPS_INFO|MPS_RECOVERY,
            "Command timeout on target %u(0x%04x) %d set, %d.%d elapsed\n",
            targ->tid, targ->handle, ccb->ccb_h.timeout,
            sbintime_getsec(elapsed), elapsed & 0xffffffff);

        /* XXX first, check the firmware state, to see if it's still
         * operational.  if not, do a diag reset.
         */
        mpssas_set_ccbstatus(cm->cm_ccb, CAM_CMD_TIMEOUT);
        cm->cm_flags |= MPS_CM_FLAGS_ON_RECOVERY | MPS_CM_FLAGS_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_dprint(sc, MPS_RECOVERY,
                    "queued timedout cm %p for processing by tm %p\n",
                    cm, targ->tm);
        } else if ((targ->tm = mpssas_alloc_tm(sc)) != NULL) {
                mps_dprint(sc, MPS_RECOVERY|MPS_INFO,
                    "Sending abort to target %u for SMID %d\n", targ->tid,
                    cm->cm_desc.Default.SMID);
                mps_dprint(sc, MPS_RECOVERY, "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_dprint(sc, MPS_ERROR|MPS_RECOVERY,
                    "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;
        uint32_t mpi_control;

        sc = sassc->sc;
        MPS_FUNCTRACE(sc);
        mtx_assert(&sc->mps_mtx, MA_OWNED);

        csio = &ccb->csio;
        KASSERT(csio->ccb_h.target_id < sassc->maxtargets,
            ("Target %d out of bounds in XPT_SCSI_IO\n",
             csio->ccb_h.target_id));
        targ = &sassc->targets[csio->ccb_h.target_id];
        mps_dprint(sc, MPS_TRACE, "ccb %p target flag %x\n", ccb, targ->flags);
        if (targ->handle == 0x0) {
                mps_dprint(sc, MPS_ERROR, "%s NULL handle for target %u\n", 
                    __func__, csio->ccb_h.target_id);
                mpssas_set_ccbstatus(ccb, CAM_DEV_NOT_THERE);
                xpt_done(ccb);
                return;
        }
        if (targ->flags & MPS_TARGET_FLAGS_RAID_COMPONENT) {
                mps_dprint(sc, MPS_ERROR, "%s Raid component no SCSI IO "
                    "supported %u\n", __func__, csio->ccb_h.target_id);
                mpssas_set_ccbstatus(ccb, CAM_DEV_NOT_THERE);
                xpt_done(ccb);
                return;
        }
        /*
         * Sometimes, it is possible to get a command that is not "In
         * Progress" and was actually aborted by the upper layer.  Check for
         * this here and complete the command without error.
         */
        if (mpssas_get_ccbstatus(ccb) != CAM_REQ_INPROG) {
                mps_dprint(sc, MPS_TRACE, "%s Command is not in progress for "
                    "target %u\n", __func__, csio->ccb_h.target_id);
                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. In either event,
         * we're removing the target due to a firmware event telling us
         * the device is now gone (as opposed to some transient event). Since
         * we're opting to remove failed devices from the OS's view, we need
         * to propagate that status up the stack.
         */
        if (targ->flags & MPSSAS_TARGET_INREMOVAL) {
                if (targ->devinfo == 0)
                        mpssas_set_ccbstatus(ccb, CAM_REQ_CMP);
                else
                        mpssas_set_ccbstatus(ccb, CAM_DEV_NOT_THERE);
                xpt_done(ccb);
                return;
        }

        if ((sc->mps_flags & MPS_FLAGS_SHUTDOWN) != 0) {
                mps_dprint(sc, MPS_INFO, "%s shutting down\n", __func__);
                mpssas_set_ccbstatus(ccb, CAM_DEV_NOT_THERE);
                xpt_done(ccb);
                return;
        }

        /*
         * If target has a reset in progress, freeze the devq and return.  The
         * devq will be released when the TM reset is finished.
         */
        if (targ->flags & MPSSAS_TARGET_INRESET) {
                ccb->ccb_h.status = CAM_BUSY | CAM_DEV_QFRZN;
                mps_dprint(sc, MPS_INFO, "%s: Freezing devq for target ID %d\n",
                    __func__, targ->tid);
                xpt_freeze_devq(ccb->ccb_h.path, 1);
                xpt_done(ccb);
                return;
        }

        cm = mps_alloc_command(sc);
        if (cm == NULL || (sc->mps_flags & MPS_FLAGS_DIAGRESET)) {
                if (cm != NULL) {
                        mps_free_command(sc, cm);
                }
                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 = htole16(targ->handle);
        req->Function = MPI2_FUNCTION_SCSI_IO_REQUEST;
        req->MsgFlags = 0;
        req->SenseBufferLowAddress = htole32(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 = htole32(csio->dxfer_len);
        req->BidirectionalDataLength = 0;
        req->IoFlags = htole16(csio->cdb_len);
        req->EEDPFlags = 0;

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

        if (csio->cdb_len == 32)
                mpi_control |= 4 << MPI2_SCSIIO_CONTROL_ADDCDBLEN_SHIFT;
        /*
         * 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:
                mpi_control |= MPI2_SCSIIO_CONTROL_HEADOFQ;
                break;
        case MSG_ORDERED_Q_TAG:
                mpi_control |= MPI2_SCSIIO_CONTROL_ORDEREDQ;
                break;
        case MSG_ACA_TASK:
                mpi_control |= MPI2_SCSIIO_CONTROL_ACAQ;
                break;
        case CAM_TAG_ACTION_NONE:
        case MSG_SIMPLE_Q_TAG:
        default:
                mpi_control |= MPI2_SCSIIO_CONTROL_SIMPLEQ;
                break;
        }
        mpi_control |= (csio->priority << MPI2_SCSIIO_CONTROL_TASKPRI_SHIFT) &
            MPI2_SCSIIO_CONTROL_TASKPRI_MASK;
        mpi_control |= sc->mapping_table[csio->ccb_h.target_id].TLR_bits;
        req->Control = htole32(mpi_control);
        if (MPS_SET_LUN(req->LUN, csio->ccb_h.target_lun) != 0) {
                mps_free_command(sc, cm);
                mpssas_set_ccbstatus(ccb, 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 = htole16(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 = htole16(lun->eedp_block_size);
                        eedp_flags |= (MPI2_SCSIIO_EEDPFLAGS_INC_PRI_REFTAG |
                            MPI2_SCSIIO_EEDPFLAGS_CHECK_REFTAG |
                            MPI2_SCSIIO_EEDPFLAGS_CHECK_GUARD);
                        req->EEDPFlags = htole16(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.PrimaryReferenceTag = 
                                        htole32(req->CDB.EEDP32.PrimaryReferenceTag);
                                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 = htole16(eedp_flags);
                                req->CDB.CDB32[10] = (req->CDB.CDB32[10] &
                                    0x1F) | 0x20;
                        }
                }
        }

        cm->cm_length = csio->dxfer_len;
        if (cm->cm_length != 0) {
                cm->cm_data = ccb;
                cm->cm_flags |= MPS_CM_FLAGS_USE_CCB;
        } else {
                cm->cm_data = NULL;
        }
        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 = htole16(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.sim_priv.entries[0].field == MPS_WD_RETRY) {
                        mpssas_direct_drive_io(sassc, cm, ccb);
                } else {
                        mpssas_set_ccbstatus(ccb, CAM_REQ_INPROG);
                }
        }

#if defined(BUF_TRACKING) || defined(FULL_BUF_TRACKING)
        if (csio->bio != NULL)
                biotrack(csio->bio, __func__);
#endif
        csio->ccb_h.qos.sim_data = sbinuptime();
        callout_reset_sbt(&cm->cm_callout, SBT_1MS * ccb->ccb_h.timeout, 0,
            mpssas_scsiio_timeout, cm, 0);

        targ->issued++;
        targ->outstanding++;
        TAILQ_INSERT_TAIL(&targ->commands, cm, cm_link);
        ccb->ccb_h.status |= CAM_SIM_QUEUED;

        mpssas_log_command(cm, MPS_XINFO, "%s cm %p ccb %p outstanding %u\n",
            __func__, cm, ccb, targ->outstanding);

        mps_map_command(sc, cm);
        return;
}

/**
 * mps_sc_failed_io_info - translated non-succesfull SCSI_IO request
 */
static void
mps_sc_failed_io_info(struct mps_softc *sc, struct ccb_scsiio *csio,
    Mpi2SCSIIOReply_t *mpi_reply)
{
        u32 response_info;
        u8 *response_bytes;
        u16 ioc_status = le16toh(mpi_reply->IOCStatus) &
            MPI2_IOCSTATUS_MASK;
        u8 scsi_state = mpi_reply->SCSIState;
        u8 scsi_status = mpi_reply->SCSIStatus;
        u32 log_info = le32toh(mpi_reply->IOCLogInfo);
        const char *desc_ioc_state, *desc_scsi_status;

        if (log_info == 0x31170000)
                return;

        desc_ioc_state = mps_describe_table(mps_iocstatus_string,
            ioc_status);
        desc_scsi_status = mps_describe_table(mps_scsi_status_string,
            scsi_status);

        mps_dprint(sc, MPS_XINFO, "\thandle(0x%04x), ioc_status(%s)(0x%04x)\n",
            le16toh(mpi_reply->DevHandle), desc_ioc_state, ioc_status);

        /*
         *We can add more detail about underflow data here
         * TO-DO
         */
        mps_dprint(sc, MPS_XINFO, "\tscsi_status(%s)(0x%02x), "
            "scsi_state %b\n", desc_scsi_status, scsi_status,
            scsi_state, "\20" "\1AutosenseValid" "\2AutosenseFailed"
            "\3NoScsiStatus" "\4Terminated" "\5Response InfoValid");

        if (sc->mps_debug & MPS_XINFO &&
                scsi_state & MPI2_SCSI_STATE_AUTOSENSE_VALID) {
                mps_dprint(sc, MPS_XINFO, "-> Sense Buffer Data : Start :\n");
                scsi_sense_print(csio);
                mps_dprint(sc, MPS_XINFO, "-> Sense Buffer Data : End :\n");
        }

        if (scsi_state & MPI2_SCSI_STATE_RESPONSE_INFO_VALID) {
                response_info = le32toh(mpi_reply->ResponseInfo);
                response_bytes = (u8 *)&response_info;
                mps_dprint(sc, MPS_XINFO, "response code(0x%1x): %s\n",
                    response_bytes[0],
                    mps_describe_table(mps_scsi_taskmgmt_string,
                    response_bytes[0]));
        }
}

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;
        struct mpssas_target *target;
        target_id_t target_id;

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

        callout_stop(&cm->cm_callout);
        mtx_assert(&sc->mps_mtx, MA_OWNED);

        sassc = sc->sassc;
        ccb = cm->cm_complete_data;
        csio = &ccb->csio;
        target_id = csio->ccb_h.target_id;
        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);
        ccb->ccb_h.status &= ~(CAM_STATUS_MASK | CAM_SIM_QUEUED);

#if defined(BUF_TRACKING) || defined(FULL_BUF_TRACKING)
        if (ccb->csio.bio != NULL)
                biotrack(ccb->csio.bio, __func__);
#endif

        if (cm->cm_flags & MPS_CM_FLAGS_ON_RECOVERY) {
                TAILQ_REMOVE(&cm->cm_targ->timedout_commands, cm, cm_recovery);
                KASSERT(cm->cm_state == MPS_CM_STATE_BUSY,
                    ("Not busy for CM_FLAGS_TIMEDOUT: %d\n", cm->cm_state));
                cm->cm_flags &= ~MPS_CM_FLAGS_ON_RECOVERY;
                if (cm->cm_reply != NULL)
                        mpssas_log_command(cm, MPS_RECOVERY,
                            "completed timedout cm %p ccb %p during recovery "
                            "ioc %x scsi %x state %x xfer %u\n",
                            cm, cm->cm_ccb, le16toh(rep->IOCStatus),
                            rep->SCSIStatus, rep->SCSIState,
                            le32toh(rep->TransferCount));
                else
                        mpssas_log_command(cm, MPS_RECOVERY,
                            "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, MPS_RECOVERY,
                            "completed cm %p ccb %p during recovery "
                            "ioc %x scsi %x state %x xfer %u\n",
                            cm, cm->cm_ccb, le16toh(rep->IOCStatus),
                            rep->SCSIStatus, rep->SCSIState,
                            le32toh(rep->TransferCount));
                else
                        mpssas_log_command(cm, MPS_RECOVERY,
                            "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, MPS_RECOVERY,
                    "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.
                 */
                mpssas_set_ccbstatus(ccb, 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_XINFO, "Error sending command, "
                                   "freezing SIM queue\n");
                }
        }

        /*
         * If this is a Start Stop Unit command and it was issued by the driver
         * during shutdown, decrement the refcount to account for all of the
         * commands that were sent.  All SSU commands should be completed before
         * shutdown completes, meaning SSU_refcount will be 0 after SSU_started
         * is TRUE.
         */
        if (sc->SSU_started && (csio->cdb_io.cdb_bytes[0] == START_STOP_UNIT)) {
                mps_dprint(sc, MPS_INFO, "Decrementing SSU count.\n");
                sc->SSU_refcount--;
        }

        /* Take the fast path to completion */
        if (cm->cm_reply == NULL) {
                if (mpssas_get_ccbstatus(ccb) == CAM_REQ_INPROG) {
                        if ((sc->mps_flags & MPS_FLAGS_DIAGRESET) != 0)
                                mpssas_set_ccbstatus(ccb, CAM_SCSI_BUS_RESET);
                        else {
                                mpssas_set_ccbstatus(ccb, 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_XINFO,
                                    "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 (mpssas_get_ccbstatus(ccb) != CAM_REQ_CMP) {
                        /*
                         * Freeze the dev queue so that commands are
                         * executed in the correct order 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;
        }

        mpssas_log_command(cm, MPS_XINFO,
            "ioc %x scsi %x state %x xfer %u\n",
            le16toh(rep->IOCStatus), rep->SCSIStatus, rep->SCSIState,
            le32toh(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.sim_priv.entries[0].field = MPS_WD_RETRY;
                mpssas_action_scsiio(sassc, ccb);
                return;
        } else
                ccb->ccb_h.sim_priv.entries[0].field = 0;

        switch (le16toh(rep->IOCStatus) & MPI2_IOCSTATUS_MASK) {
        case MPI2_IOCSTATUS_SCSI_DATA_UNDERRUN:
                csio->resid = cm->cm_length - le32toh(rep->TransferCount);
                /* FALLTHROUGH */
        case MPI2_IOCSTATUS_SUCCESS:
        case MPI2_IOCSTATUS_SCSI_RECOVERED_ERROR:

                if ((le16toh(rep->IOCStatus) & MPI2_IOCSTATUS_MASK) ==
                    MPI2_IOCSTATUS_SCSI_RECOVERED_ERROR)
                        mpssas_log_command(cm, MPS_XINFO, "recovered error\n");

                /* Completion failed at the transport level. */
                if (rep->SCSIState & (MPI2_SCSI_STATE_NO_SCSI_STATUS |
                    MPI2_SCSI_STATE_TERMINATED)) {
                        mpssas_set_ccbstatus(ccb, 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) {
                        mpssas_set_ccbstatus(ccb, 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) &&
                    ((le32toh(rep->ResponseInfo) &
                    MPI2_SCSI_RI_MASK_REASONCODE) ==
                    MPS_SCSI_RI_INVALID_FRAME)) {
                        sc->mapping_table[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)) {
                        mpssas_set_ccbstatus(ccb, CAM_REQ_ABORTED);
                        break;
                }

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

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

                        returned_sense_len = min(le32toh(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->ccb_h.flags & CAM_DATA_MASK) == CAM_DATA_VADDR) &&
                    (csio->data_ptr != NULL) &&
                    ((csio->data_ptr[0] & 0x1f) == T_SEQUENTIAL) &&
                    (sc->control_TLR) &&
                    (sc->mapping_table[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[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];
                        alloc_len -= csio->resid;
                        for (i = 0; i < MIN(vpd_list->length, alloc_len); i++) {
                                if (vpd_list->list[i] == 0x90) {
                                        *TLR_bits = TLR_on;
                                        break;
                                }
                        }
                }

                /*
                 * If this is a SATA direct-access end device, mark it so that
                 * a SCSI StartStopUnit command will be sent to it when the
                 * driver is being shutdown.
                 */
                if ((csio->cdb_io.cdb_bytes[0] == INQUIRY) &&
                    ((csio->data_ptr[0] & 0x1f) == T_DIRECT) &&
                    (sc->mapping_table[target_id].device_info &
                    MPI2_SAS_DEVICE_INFO_SATA_DEVICE) &&
                    ((sc->mapping_table[target_id].device_info &
                    MPI2_SAS_DEVICE_INFO_MASK_DEVICE_TYPE) ==
                    MPI2_SAS_DEVICE_INFO_END_DEVICE)) {
                        target = &sassc->targets[target_id];
                        target->supports_SSU = TRUE;
                        mps_dprint(sc, MPS_XINFO, "Target %d supports SSU\n",
                            target_id);
                }
                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)
                        mpssas_set_ccbstatus(ccb, CAM_REQ_CMP);
                else
                        mpssas_set_ccbstatus(ccb, CAM_DEV_NOT_THERE);
                break;
        case MPI2_IOCSTATUS_INVALID_SGL:
                mps_print_scsiio_cmd(sc, cm);
                mpssas_set_ccbstatus(ccb, 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_flags & MPS_CM_FLAGS_TIMEDOUT)
                        mpssas_set_ccbstatus(ccb, CAM_CMD_TIMEOUT);
                else
                        mpssas_set_ccbstatus(ccb, CAM_REQ_ABORTED);
                break;
        case MPI2_IOCSTATUS_SCSI_DATA_OVERRUN:
                /* resid is ignored for this condition */
                csio->resid = 0;
                mpssas_set_ccbstatus(ccb, CAM_DATA_RUN_ERR);
                break;
        case MPI2_IOCSTATUS_SCSI_IOC_TERMINATED:
        case MPI2_IOCSTATUS_SCSI_EXT_TERMINATED:
                /*
                 * These can sometimes be transient transport-related
                 * errors, and sometimes persistent drive-related errors.
                 * We used to retry these without decrementing the retry
                 * count by returning CAM_REQUEUE_REQ.  Unfortunately, if
                 * we hit a persistent drive problem that returns one of
                 * these error codes, we would retry indefinitely.  So,
                 * return CAM_REQ_CMP_ERROR so that we decrement the retry
                 * count and avoid infinite retries.  We're taking the
                 * potential risk of flagging false failures in the event
                 * of a topology-related error (e.g. a SAS expander problem
                 * causes a command addressed to a drive to fail), but
                 * avoiding getting into an infinite retry loop. However,
                 * if we get them while were moving a device, we should
                 * fail the request as 'not there' because the device
                 * is effectively gone.
                 */
                if (cm->cm_targ->flags & MPSSAS_TARGET_INREMOVAL)
                        mpssas_set_ccbstatus(ccb, CAM_DEV_NOT_THERE);
                else
                        mpssas_set_ccbstatus(ccb, CAM_REQ_CMP_ERR);
                mps_dprint(sc, MPS_INFO,
                    "Controller reported %s tgt %u SMID %u loginfo %x%s\n",
                    mps_describe_table(mps_iocstatus_string,
                    le16toh(rep->IOCStatus) & MPI2_IOCSTATUS_MASK),
                    target_id, cm->cm_desc.Default.SMID,
                    le32toh(rep->IOCLogInfo),
                    (cm->cm_targ->flags & MPSSAS_TARGET_INREMOVAL) ? " departing" : "");
                mps_dprint(sc, MPS_XINFO,
                    "SCSIStatus %x SCSIState %x xfercount %u\n",
                    rep->SCSIStatus, rep->SCSIState,
                    le32toh(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, MPS_XINFO,
                    "completed ioc %x loginfo %x scsi %x state %x xfer %u\n",
                    le16toh(rep->IOCStatus), le32toh(rep->IOCLogInfo),
                    rep->SCSIStatus, rep->SCSIState,
                    le32toh(rep->TransferCount));
                csio->resid = cm->cm_length;
                mpssas_set_ccbstatus(ccb, CAM_REQ_CMP_ERR);
                break;
        }

        mps_sc_failed_io_info(sc,csio,rep);

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

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

        /*
         * Check to see if we're removing the device. If so, and this is the
         * last command on the queue, proceed with the deferred removal of the
         * device.  Note, for removing a volume, this won't trigger because
         * pending_remove_tm will be NULL.
         */
        if (cm->cm_targ->flags & MPSSAS_TARGET_INREMOVAL) {
                if (TAILQ_FIRST(&cm->cm_targ->commands) == NULL &&
                    cm->cm_targ->pending_remove_tm != NULL) {
                        mps_dprint(sc, MPS_INFO, "Last pending command complete: starting remove_device\n");
                        mps_map_command(sc, cm->cm_targ->pending_remove_tm);
                        cm->cm_targ->pending_remove_tm = NULL;
                }
        }

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

/* All Request reached here are Endian safe */
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 boundary, 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 =
                                    htole16(sc->DD_column_map[column].dev_handle);
                                /* ???? Is this endian safe*/
                                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, 12 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) || (CDB[0] == READ_12) ||
            (CDB[0] == WRITE_12))) {
                /*
                 * 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 and 12-byte CDB's are OK.
                 * FreeBSD sends very rare 12 byte READ/WRITE, but driver is 
                 * ready to accept 12byte CDB for Direct IOs.
                 */
                if ((CDB[0] == READ_10 || CDB[0] == WRITE_10) ||
                    (CDB[0] == READ_12 || CDB[0] == WRITE_12) ||
                    !(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_12) || 
                                (CDB[0] == WRITE_12) ||
                                (CDB[0] == READ_10) ||
                                (CDB[0] == WRITE_10))? 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
                                 * boundary, 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 =
                                            htole16(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
                                 * boundary, 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 =
                                            htole16(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;
                                }
                        }
                }
        }
}

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_dprint(sc, MPS_ERROR,"%s: cm_flags = %#x on SMP request!\n",
                           __func__, cm->cm_flags);
                mpssas_set_ccbstatus(ccb, CAM_REQ_CMP_ERR);
                goto bailout;
        }

        rpl = (MPI2_SMP_PASSTHROUGH_REPLY *)cm->cm_reply;
        if (rpl == NULL) {
                mps_dprint(sc, MPS_ERROR, "%s: NULL cm_reply!\n", __func__);
                mpssas_set_ccbstatus(ccb, 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 ((le16toh(rpl->IOCStatus) & MPI2_IOCSTATUS_MASK) !=
            MPI2_IOCSTATUS_SUCCESS ||
            rpl->SASStatus != MPI2_SASSTATUS_SUCCESS) {
                mps_dprint(sc, MPS_XINFO, "%s: IOCStatus %04x SASStatus %02x\n",
                    __func__, le16toh(rpl->IOCStatus), rpl->SASStatus);
                mpssas_set_ccbstatus(ccb, CAM_REQ_CMP_ERR);
                goto bailout;
        }

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

        if (ccb->smpio.smp_response[2] == SMP_FR_ACCEPTED)
                mpssas_set_ccbstatus(ccb, CAM_REQ_CMP);
        else
                mpssas_set_ccbstatus(ccb, 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.
         */
        switch ((ccb->ccb_h.flags & CAM_DATA_MASK)) {
        case CAM_DATA_PADDR:
        case CAM_DATA_SG_PADDR:
                mps_dprint(sc, MPS_ERROR,
                           "%s: physical addresses not supported\n", __func__);
                mpssas_set_ccbstatus(ccb, CAM_REQ_INVALID);
                xpt_done(ccb);
                return;
        case CAM_DATA_SG:
                /*
                 * 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_dprint(sc, MPS_ERROR,
                                   "%s: multiple request or response "
                                   "buffer segments not supported for SMP\n",
                                   __func__);
                        mpssas_set_ccbstatus(ccb, 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 *)(uintptr_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 *)(uintptr_t)rsp_sg[0].ds_addr;
                } else
                        response = ccb->smpio.smp_response;
                break;
        case CAM_DATA_VADDR:
                request = ccb->smpio.smp_request;
                response = ccb->smpio.smp_response;
                break;
        default:
                mpssas_set_ccbstatus(ccb, CAM_REQ_INVALID);
                xpt_done(ccb);
                return;
        }

        cm = mps_alloc_command(sc);
        if (cm == NULL) {
                mps_dprint(sc, MPS_ERROR,
                    "%s: cannot allocate command\n", __func__);
                mpssas_set_ccbstatus(ccb, 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 = htole16(ccb->smpio.smp_request_len);
        req->SGLFlags = 
            MPI2_SGLFLAGS_SYSTEM_ADDRESS_SPACE | MPI2_SGLFLAGS_SGL_TYPE_MPI;

        mps_dprint(sc, MPS_XINFO, "%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 = le16toh(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_dprint(sc, MPS_ERROR,
                           "%s: error %d returned from mps_map_command()\n",
                           __func__, error);
                goto bailout_error;
        }

        return;

bailout_error:
        mps_free_command(sc, cm);
        mpssas_set_ccbstatus(ccb, 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.
         */
        KASSERT(ccb->ccb_h.target_id < sassc->maxtargets,
            ("Target %d out of bounds in XPT_SMP_IO\n", ccb->ccb_h.target_id));
        targ = &sassc->targets[ccb->ccb_h.target_id];
        if (targ->handle == 0x0) {
                mps_dprint(sc, MPS_ERROR,
                           "%s: target %d does not exist!\n", __func__,
                           ccb->ccb_h.target_id);
                mpssas_set_ccbstatus(ccb, 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_dprint(sc, MPS_ERROR,
                                   "%s: handle %d does not have a valid "
                                   "parent handle!\n", __func__, targ->handle);
                        mpssas_set_ccbstatus(ccb, CAM_DEV_NOT_THERE);
                        goto bailout;
                }
#ifdef OLD_MPS_PROBE
                parent_target = mpssas_find_target_by_handle(sassc, 0,
                        targ->parent_handle);

                if (parent_target == NULL) {
                        mps_dprint(sc, MPS_ERROR,
                                   "%s: handle %d does not have a valid "
                                   "parent target!\n", __func__, targ->handle);
                        mpssas_set_ccbstatus(ccb, CAM_DEV_NOT_THERE);
                        goto bailout;
                }

                if ((parent_target->devinfo &
                     MPI2_SAS_DEVICE_INFO_SMP_TARGET) == 0) {
                        mps_dprint(sc, MPS_ERROR,
                                   "%s: handle %d parent %d does not "
                                   "have an SMP target!\n", __func__,
                                   targ->handle, parent_target->handle);
                        mpssas_set_ccbstatus(ccb, CAM_DEV_NOT_THERE);
                        goto bailout;
                }

                sasaddr = parent_target->sasaddr;
#else /* OLD_MPS_PROBE */
                if ((targ->parent_devinfo &
                     MPI2_SAS_DEVICE_INFO_SMP_TARGET) == 0) {
                        mps_dprint(sc, MPS_ERROR,
                                   "%s: handle %d parent %d does not "
                                   "have an SMP target!\n", __func__,
                                   targ->handle, targ->parent_handle);
                        mpssas_set_ccbstatus(ccb, CAM_DEV_NOT_THERE);
                        goto bailout;
                }
                if (targ->parent_sasaddr == 0x0) {
                        mps_dprint(sc, MPS_ERROR,
                                   "%s: handle %d parent handle %d does "
                                   "not have a valid SAS address!\n",
                                   __func__, targ->handle, targ->parent_handle);
                        mpssas_set_ccbstatus(ccb, CAM_DEV_NOT_THERE);
                        goto bailout;
                }

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

        if (sasaddr == 0) {
                mps_dprint(sc, MPS_INFO,
                           "%s: unable to find SAS address for handle %d\n",
                           __func__, targ->handle);
                mpssas_set_ccbstatus(ccb, CAM_DEV_NOT_THERE);
                goto bailout;
        }
        mpssas_send_smpcmd(sassc, ccb, sasaddr);

        return;

bailout:
        xpt_done(ccb);

}

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_FUNCTRACE(sassc->sc);
        mtx_assert(&sassc->sc->mps_mtx, MA_OWNED);

        KASSERT(ccb->ccb_h.target_id < sassc->maxtargets,
            ("Target %d out of bounds in XPT_RESET_DEV\n",
             ccb->ccb_h.target_id));
        sc = sassc->sc;
        tm = mpssas_alloc_tm(sc);
        if (tm == NULL) {
                mps_dprint(sc, MPS_ERROR,
                    "command alloc failure in mpssas_action_resetdev\n");
                mpssas_set_ccbstatus(ccb, 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 = htole16(targ->handle);
        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_complete = mpssas_resetdev_complete;
        tm->cm_complete_data = ccb;
        tm->cm_targ = targ;

        mpssas_prepare_for_tm(sc, tm, targ, CAM_LUN_WILDCARD);
        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_FUNCTRACE(sc);
        mtx_assert(&sc->mps_mtx, MA_OWNED);

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

        mps_dprint(sc, MPS_XINFO,
            "%s: IOCStatus = 0x%x ResponseCode = 0x%x\n", __func__,
            le16toh(resp->IOCStatus), le32toh(resp->ResponseCode));

        if (le32toh(resp->ResponseCode) == MPI2_SCSITASKMGMT_RSP_TM_COMPLETE) {
                mpssas_set_ccbstatus(ccb, CAM_REQ_CMP);
                mpssas_announce_reset(sc, AC_SENT_BDR, tm->cm_targ->tid,
                    CAM_LUN_WILDCARD);
        }
        else
                mpssas_set_ccbstatus(ccb, 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_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 should have a handle for this, but check to make sure.
                 */
                KASSERT(xpt_path_target_id(path) < sassc->maxtargets,
                    ("Target %d out of bounds in mpssas_async\n",
                    xpt_path_target_id(path)));
                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 = malloc(sizeof(struct mpssas_lun), M_MPT2,
                                     M_NOWAIT | M_ZERO);
                        if (lun == NULL) {
                                mps_dprint(sc, MPS_ERROR, "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 = CDAI_FLAG_NONE;
                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 ((mpssas_get_ccbstatus((union ccb *)&cdai) == CAM_REQ_CMP)
                 && (rcap_buf.prot & SRC16_PROT_EN)) {
                        switch (rcap_buf.prot & SRC16_P_TYPE) {
                        case SRC16_PTYPE_1:
                        case SRC16_PTYPE_3:
                                lun->eedp_formatted = TRUE;
                                lun->eedp_block_size =
                                    scsi_4btoul(rcap_buf.length);
                                break;
                        case SRC16_PTYPE_2:
                        default:
                                lun->eedp_formatted = FALSE;
                                lun->eedp_block_size = 0;
                                break;
                        }
                } else {
                        lun->eedp_formatted = FALSE;
                        lun->eedp_block_size = 0;
                }
                break;
        }
        default:
                break;
        }
}

/*
 * Set the INRESET flag for this target so that no I/O will be sent to
 * the target until the reset has completed.  If an I/O request does
 * happen, the devq will be frozen.  The CCB holds the path which is
 * used to release the devq.  The devq is released and the CCB is freed
 * when the TM completes.
 */
void
mpssas_prepare_for_tm(struct mps_softc *sc, struct mps_command *tm,
    struct mpssas_target *target, lun_id_t lun_id)
{
        union ccb *ccb;
        path_id_t path_id;

        ccb = xpt_alloc_ccb_nowait();
        if (ccb) {
                path_id = cam_sim_path(sc->sassc->sim);
                if (xpt_create_path(&ccb->ccb_h.path, xpt_periph, path_id,
                    target->tid, lun_id) != CAM_REQ_CMP) {
                        xpt_free_ccb(ccb);
                } else {
                        tm->cm_ccb = ccb;
                        tm->cm_targ = target;
                        target->flags |= MPSSAS_TARGET_INRESET;
                }
        }
}

int
mpssas_startup(struct mps_softc *sc)
{

        /*
         * 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.
         */
        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_FUNCTRACE(sc);

        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_XINFO, 
            "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;

        MPS_FUNCTRACE(sc);
        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_dprint(sc, MPS_ERROR, "%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 (le16toh(reply->IOCStatus & MPI2_IOCSTATUS_MASK) !=
            MPI2_IOCSTATUS_SUCCESS)
                mps_dprint(sc, MPS_FAULT, "Portenable failed\n");

        mps_free_command(sc, cm);

        /*
         * 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);

        /*
         * 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;
        wakeup(&sc->port_enable_complete);
        mpssas_startup_decrement(sassc);
}

int
mpssas_check_id(struct mpssas_softc *sassc, int id)
{
        struct mps_softc *sc = sassc->sc;
        char *ids;
        char *name;

        ids = &sc->exclude_ids[0];
        while((name = strsep(&ids, ",")) != NULL) {
                if (name[0] == '\0')
                        continue;
                if (strtol(name, NULL, 0) == (long)id)
                        return (1);
        }

        return (0);
}

void
mpssas_realloc_targets(struct mps_softc *sc, int maxtargets)
{
        struct mpssas_softc *sassc;
        struct mpssas_lun *lun, *lun_tmp;
        struct mpssas_target *targ;
        int i;

        sassc = sc->sassc;
        /*
         * The number of targets is based on IOC Facts, so free all of
         * the allocated LUNs for each target and then the target buffer
         * itself.
         */
        for (i=0; i< maxtargets; i++) {
                targ = &sassc->targets[i];
                SLIST_FOREACH_SAFE(lun, &targ->luns, lun_link, lun_tmp) {
                        free(lun, M_MPT2);
                }
        }
        free(sassc->targets, M_MPT2);

        sassc->targets = malloc(sizeof(struct mpssas_target) * maxtargets,
            M_MPT2, M_WAITOK|M_ZERO);
}