Fix a couple of NULL dereferences in error paths.

[dragonfly.git] / sys / dev / raid / mrsas / mrsas.c

/*
 * Copyright (c) 2014, LSI Corp.
 * All rights reserved.
 * Author: Marian Choy
 * Support: freebsdraid@lsi.com
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name of the <ORGANIZATION> nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
 * COPYRIGHT HOLDER 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.
 *
 * The views and conclusions contained in the software and documentation
 * are those of the authors and should not be interpreted as representing
 * official policies,either expressed or implied, of the FreeBSD Project.
 *
 * Send feedback to: <megaraidfbsd@lsi.com>
 * Mail to: LSI Corporation, 1621 Barber Lane, Milpitas, CA 95035
 *    ATTN: MegaRaid FreeBSD
 *
 * $FreeBSD: head/sys/dev/mrsas/mrsas.c 265555 2014-05-07 16:16:49Z ambrisko $
 */

#include <dev/raid/mrsas/mrsas.h>
#include <dev/raid/mrsas/mrsas_ioctl.h>

#include <bus/cam/cam.h>
#include <bus/cam/cam_ccb.h>

#include <sys/sysctl.h>
#include <sys/types.h>
#include <sys/kthread.h>
#include <sys/taskqueue.h>
#include <sys/device.h>
#include <sys/spinlock2.h>


/* 
 * Function prototypes 
 */
static d_open_t     mrsas_open;
static d_close_t    mrsas_close;
static d_read_t     mrsas_read;
static d_write_t    mrsas_write;
static d_ioctl_t    mrsas_ioctl;

static struct mrsas_ident *mrsas_find_ident(device_t);
static void mrsas_shutdown_ctlr(struct mrsas_softc *sc, u_int32_t opcode);
static void mrsas_flush_cache(struct mrsas_softc *sc);
static void mrsas_reset_reply_desc(struct mrsas_softc *sc);
static void mrsas_ocr_thread(void *arg);
static int mrsas_get_map_info(struct mrsas_softc *sc);
static int mrsas_get_ld_map_info(struct mrsas_softc *sc);
static int mrsas_sync_map_info(struct mrsas_softc *sc);
static int mrsas_get_pd_list(struct mrsas_softc *sc);
static int mrsas_get_ld_list(struct mrsas_softc *sc);
static int mrsas_setup_irq(struct mrsas_softc *sc);
static int mrsas_alloc_mem(struct mrsas_softc *sc);
static int mrsas_init_fw(struct mrsas_softc *sc);
static int mrsas_setup_raidmap(struct mrsas_softc *sc);
static int mrsas_complete_cmd(struct mrsas_softc *sc);
static int mrsas_clear_intr(struct mrsas_softc *sc);
static int mrsas_get_ctrl_info(struct mrsas_softc *sc, 
                          struct mrsas_ctrl_info *ctrl_info);
static int mrsas_issue_blocked_abort_cmd(struct mrsas_softc *sc,
                         struct mrsas_mfi_cmd *cmd_to_abort);
u_int32_t mrsas_read_reg(struct mrsas_softc *sc, int offset);
u_int8_t mrsas_build_mptmfi_passthru(struct mrsas_softc *sc, 
                         struct mrsas_mfi_cmd *mfi_cmd);
int mrsas_transition_to_ready(struct mrsas_softc *sc, int ocr);
int mrsas_init_adapter(struct mrsas_softc *sc);
int mrsas_alloc_mpt_cmds(struct mrsas_softc *sc);
int mrsas_alloc_ioc_cmd(struct mrsas_softc *sc);
int mrsas_alloc_ctlr_info_cmd(struct mrsas_softc *sc);
int mrsas_ioc_init(struct mrsas_softc *sc);
int mrsas_bus_scan(struct mrsas_softc *sc);
int mrsas_issue_dcmd(struct mrsas_softc *sc, struct mrsas_mfi_cmd *cmd);
int mrsas_issue_polled(struct mrsas_softc *sc, struct mrsas_mfi_cmd *cmd);
int mrsas_reset_ctrl(struct mrsas_softc *sc);
int mrsas_wait_for_outstanding(struct mrsas_softc *sc);
int mrsas_issue_blocked_cmd(struct mrsas_softc *sc,
                          struct mrsas_mfi_cmd *cmd);
int mrsas_alloc_tmp_dcmd(struct mrsas_softc *sc, struct mrsas_tmp_dcmd *tcmd, 
                          int size);
void mrsas_release_mfi_cmd(struct mrsas_mfi_cmd *cmd); 
void mrsas_wakeup(struct mrsas_softc *sc, struct mrsas_mfi_cmd *cmd);
void mrsas_complete_aen(struct mrsas_softc *sc, struct mrsas_mfi_cmd *cmd);
void mrsas_complete_abort(struct mrsas_softc *sc, struct mrsas_mfi_cmd *cmd);
void mrsas_disable_intr(struct mrsas_softc *sc);
void mrsas_enable_intr(struct mrsas_softc *sc);
void mrsas_free_ioc_cmd(struct mrsas_softc *sc);
void mrsas_free_mem(struct mrsas_softc *sc);
void mrsas_free_tmp_dcmd(struct mrsas_tmp_dcmd *tmp);
void mrsas_isr(void *arg);
void mrsas_teardown_intr(struct mrsas_softc *sc);
void mrsas_addr_cb(void *arg, bus_dma_segment_t *segs, int nsegs, int error); 
void mrsas_kill_hba (struct mrsas_softc *sc);
void mrsas_aen_handler(struct mrsas_softc *sc);
void mrsas_write_reg(struct mrsas_softc *sc, int offset,
                          u_int32_t value);
void mrsas_fire_cmd(struct mrsas_softc *sc, u_int32_t req_desc_lo, 
                          u_int32_t req_desc_hi);
void mrsas_free_ctlr_info_cmd(struct mrsas_softc *sc);
void mrsas_complete_mptmfi_passthru(struct mrsas_softc *sc, 
                          struct mrsas_mfi_cmd *cmd, u_int8_t status);
void mrsas_map_mpt_cmd_status(struct mrsas_mpt_cmd *cmd, u_int8_t status, 
                          u_int8_t extStatus);
struct mrsas_mfi_cmd* mrsas_get_mfi_cmd(struct mrsas_softc *sc);
MRSAS_REQUEST_DESCRIPTOR_UNION * mrsas_build_mpt_cmd(struct mrsas_softc *sc,
                          struct mrsas_mfi_cmd *cmd);

extern int mrsas_cam_attach(struct mrsas_softc *sc);
extern void mrsas_cam_detach(struct mrsas_softc *sc);
extern void mrsas_cmd_done(struct mrsas_softc *sc, struct mrsas_mpt_cmd *cmd);
extern void mrsas_free_frame(struct mrsas_softc *sc, struct mrsas_mfi_cmd *cmd);
extern int mrsas_alloc_mfi_cmds(struct mrsas_softc *sc);
extern void mrsas_release_mpt_cmd(struct mrsas_mpt_cmd *cmd); 
extern struct mrsas_mpt_cmd *mrsas_get_mpt_cmd(struct mrsas_softc *sc);
extern int mrsas_passthru(struct mrsas_softc *sc, void *arg);
extern uint8_t MR_ValidateMapInfo(struct mrsas_softc *sc);
extern u_int16_t MR_GetLDTgtId(u_int32_t ld, MR_FW_RAID_MAP_ALL *map);
extern MR_LD_RAID *MR_LdRaidGet(u_int32_t ld, MR_FW_RAID_MAP_ALL *map);
extern void mrsas_xpt_freeze(struct mrsas_softc *sc);
extern void mrsas_xpt_release(struct mrsas_softc *sc);
extern MRSAS_REQUEST_DESCRIPTOR_UNION *mrsas_get_request_desc(struct mrsas_softc *sc,
                         u_int16_t index);
extern int mrsas_bus_scan_sim(struct mrsas_softc *sc, struct cam_sim *sim);
static int mrsas_alloc_evt_log_info_cmd(struct mrsas_softc *sc);
static void mrsas_free_evt_log_info_cmd(struct mrsas_softc *sc);
SYSCTL_NODE(_hw, OID_AUTO, mrsas, CTLFLAG_RD, 0, "MRSAS Driver Parameters");


/**
 * PCI device struct and table
 *
 */
typedef struct mrsas_ident {
    uint16_t    vendor;
    uint16_t    device;
    uint16_t    subvendor;
    uint16_t    subdevice;
    const char  *desc;
} MRSAS_CTLR_ID;

MRSAS_CTLR_ID device_table[] = {
    {0x1000, MRSAS_TBOLT, 0xffff, 0xffff, "LSI Thunderbolt SAS Controller"},
    {0x1000, MRSAS_INVADER, 0xffff, 0xffff, "LSI Invader SAS Controller"},
    {0x1000, MRSAS_FURY, 0xffff, 0xffff, "LSI Fury SAS Controller"},
    {0, 0, 0, 0, NULL}
};

/**
 * Character device entry points 
 *
 */
static struct dev_ops mrsas_ops = {
    { "mrsas", 0, D_MPSAFE },
    .d_open =   mrsas_open,
    .d_close =  mrsas_close,
    .d_read =   mrsas_read,
    .d_write =  mrsas_write,
    .d_ioctl =  mrsas_ioctl,
};

MALLOC_DEFINE(M_MRSAS, "mrsasbuf", "Buffers for the MRSAS driver");

static int	mrsas_mfi_enable = 0;
TUNABLE_INT("hw.mrsas.mfi_enable", &mrsas_mfi_enable);

static int	mrsas_msi_enable = 1;
TUNABLE_INT("hw.mrsas.msi.enable", &mrsas_msi_enable);

/**
 * In the cdevsw routines, we find our softc by using the si_drv1 member
 * of struct cdev.  We set this variable to point to our softc in our
 * attach routine when we create the /dev entry.
 */
int
mrsas_open(struct dev_open_args *ap)
{
    cdev_t dev = ap->a_head.a_dev;
    struct mrsas_softc *sc;

    sc = dev->si_drv1;
    return (0);
}

int
mrsas_close(struct dev_close_args *ap)
{
    cdev_t dev = ap->a_head.a_dev;
    struct mrsas_softc *sc;

    sc = dev->si_drv1;
    return (0);
}

int
mrsas_read(struct dev_read_args *ap)
{
    cdev_t dev = ap->a_head.a_dev;
    struct mrsas_softc *sc;

    sc = dev->si_drv1;
    return (0);
}
int
mrsas_write(struct dev_write_args *ap)
{
    cdev_t dev = ap->a_head.a_dev;
    struct mrsas_softc *sc;

    sc = dev->si_drv1;
    return (0);
}

/** 
 * Register Read/Write Functions 
 *
 */
void
mrsas_write_reg(struct mrsas_softc *sc, int offset,
                  u_int32_t value)
{
    bus_space_tag_t         bus_tag = sc->bus_tag;
    bus_space_handle_t      bus_handle = sc->bus_handle;

    bus_space_write_4(bus_tag, bus_handle, offset, value);
}

u_int32_t
mrsas_read_reg(struct mrsas_softc *sc, int offset)
{
    bus_space_tag_t bus_tag = sc->bus_tag;
    bus_space_handle_t bus_handle = sc->bus_handle;

    return((u_int32_t)bus_space_read_4(bus_tag, bus_handle, offset));
}


/** 
 * Interrupt Disable/Enable/Clear Functions 
 *
 */
void mrsas_disable_intr(struct mrsas_softc *sc)
{
    u_int32_t mask = 0xFFFFFFFF;
    u_int32_t status;

    mrsas_write_reg(sc, offsetof(mrsas_reg_set, outbound_intr_mask), mask);
    /* Dummy read to force pci flush */
    status = mrsas_read_reg(sc, offsetof(mrsas_reg_set, outbound_intr_mask));
}

void mrsas_enable_intr(struct mrsas_softc *sc)
{
    u_int32_t mask = MFI_FUSION_ENABLE_INTERRUPT_MASK;
    u_int32_t status;

    mrsas_write_reg(sc, offsetof(mrsas_reg_set, outbound_intr_status), ~0);
    status = mrsas_read_reg(sc, offsetof(mrsas_reg_set, outbound_intr_status));

    mrsas_write_reg(sc, offsetof(mrsas_reg_set, outbound_intr_mask), ~mask);
    status = mrsas_read_reg(sc, offsetof(mrsas_reg_set, outbound_intr_mask));
}

static int mrsas_clear_intr(struct mrsas_softc *sc)
{
    u_int32_t status, fw_status, fw_state;

    /* Read received interrupt */
    status = mrsas_read_reg(sc, offsetof(mrsas_reg_set, outbound_intr_status));

    /* If FW state change interrupt is received, write to it again to clear */
    if (status & MRSAS_FW_STATE_CHNG_INTERRUPT) {
        fw_status = mrsas_read_reg(sc, offsetof(mrsas_reg_set,
                                   outbound_scratch_pad));
        fw_state = fw_status & MFI_STATE_MASK;
        if (fw_state == MFI_STATE_FAULT) {
            device_printf(sc->mrsas_dev, "FW is in FAULT state!\n");
            if(sc->ocr_thread_active)
                wakeup(&sc->ocr_chan);
        }
        mrsas_write_reg(sc, offsetof(mrsas_reg_set, outbound_intr_status), status);
        mrsas_read_reg(sc, offsetof(mrsas_reg_set, outbound_intr_status));
        return(1);
    }

    /* Not our interrupt, so just return */
    if (!(status & MFI_FUSION_ENABLE_INTERRUPT_MASK)) 
        return(0);

    /* We got a reply interrupt */
    return(1);
}

/** 
 * PCI Support Functions 
 *
 */
static struct mrsas_ident * mrsas_find_ident(device_t dev)
{
    struct mrsas_ident *pci_device;

    for (pci_device=device_table; pci_device->vendor != 0; pci_device++) 
    {
        if ((pci_device->vendor == pci_get_vendor(dev)) &&
            (pci_device->device == pci_get_device(dev)) &&
            ((pci_device->subvendor == pci_get_subvendor(dev)) ||
            (pci_device->subvendor == 0xffff)) &&
            ((pci_device->subdevice == pci_get_subdevice(dev)) ||
            (pci_device->subdevice == 0xffff)))
        return (pci_device);
    }
    return (NULL);
}

static int mrsas_probe(device_t dev)
{
    static u_int8_t first_ctrl = 1;
    struct mrsas_ident *id;

    if ((id = mrsas_find_ident(dev)) != NULL) {
        /* give priority to mfi(4) if tunable set */
        TUNABLE_INT_FETCH("hw.mrsas.mfi_enable", &mrsas_mfi_enable);
        if ((id->device == MRSAS_TBOLT) && mrsas_mfi_enable) {
            return (ENXIO);
        } else {
            if (first_ctrl) {
                kprintf("LSI MegaRAID SAS FreeBSD mrsas driver version: %s\n",
                    MRSAS_VERSION);
                first_ctrl = 0;
            } 
            device_set_desc(dev, id->desc);
            return (BUS_PROBE_DEFAULT);
        }
    }
    return (ENXIO);
}

/**
 * mrsas_setup_sysctl:  setup sysctl values for mrsas
 * input:               Adapter instance soft state
 *
 * Setup sysctl entries for mrsas driver.
 */
static void
mrsas_setup_sysctl(struct mrsas_softc *sc)
{
    struct sysctl_ctx_list  *sysctl_ctx = NULL;
    struct sysctl_oid       *sysctl_tree = NULL;
    char tmpstr[80], tmpstr2[80];

    /*
     * Setup the sysctl variable so the user can change the debug level
     * on the fly.
     */
    ksnprintf(tmpstr, sizeof(tmpstr), "MRSAS controller %d",
	device_get_unit(sc->mrsas_dev));
    ksnprintf(tmpstr2, sizeof(tmpstr2), "mrsas%d", device_get_unit(sc->mrsas_dev));

    sysctl_ctx = device_get_sysctl_ctx(sc->mrsas_dev);
    if (sysctl_ctx != NULL)
        sysctl_tree = device_get_sysctl_tree(sc->mrsas_dev);

    if (sysctl_tree == NULL) {
        sysctl_ctx_init(&sc->sysctl_ctx);
        sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx,
            SYSCTL_STATIC_CHILDREN(_hw), OID_AUTO, tmpstr2,
            CTLFLAG_RD, 0, tmpstr);
        if (sc->sysctl_tree == NULL)
             return;
        sysctl_ctx = &sc->sysctl_ctx;
        sysctl_tree = sc->sysctl_tree;
    }
    SYSCTL_ADD_UINT(sysctl_ctx, SYSCTL_CHILDREN(sysctl_tree),
        OID_AUTO, "disable_ocr", CTLFLAG_RW, &sc->disableOnlineCtrlReset, 0,
        "Disable the use of OCR");

    SYSCTL_ADD_STRING(sysctl_ctx, SYSCTL_CHILDREN(sysctl_tree),
        OID_AUTO, "driver_version", CTLFLAG_RD, MRSAS_VERSION,
        strlen(MRSAS_VERSION), "driver version");

    SYSCTL_ADD_INT(sysctl_ctx, SYSCTL_CHILDREN(sysctl_tree),
        OID_AUTO, "reset_count", CTLFLAG_RD,
        &sc->reset_count, 0, "number of ocr from start of the day");

    SYSCTL_ADD_INT(sysctl_ctx, SYSCTL_CHILDREN(sysctl_tree),
        OID_AUTO, "fw_outstanding", CTLFLAG_RD,
        &sc->fw_outstanding, 0, "FW outstanding commands");

	SYSCTL_ADD_INT(sysctl_ctx, SYSCTL_CHILDREN(sysctl_tree),
        OID_AUTO, "io_cmds_highwater", CTLFLAG_RD,
        &sc->io_cmds_highwater, 0, "Max FW outstanding commands");

    SYSCTL_ADD_UINT(sysctl_ctx, SYSCTL_CHILDREN(sysctl_tree),
        OID_AUTO, "mrsas_debug", CTLFLAG_RW, &sc->mrsas_debug, 0,
        "Driver debug level");

    SYSCTL_ADD_UINT(sysctl_ctx, SYSCTL_CHILDREN(sysctl_tree),
        OID_AUTO, "mrsas_io_timeout", CTLFLAG_RW, &sc->mrsas_io_timeout,
        0, "Driver IO timeout value in mili-second.");

    SYSCTL_ADD_UINT(sysctl_ctx, SYSCTL_CHILDREN(sysctl_tree),
        OID_AUTO, "mrsas_fw_fault_check_delay", CTLFLAG_RW,
        &sc->mrsas_fw_fault_check_delay,
        0, "FW fault check thread delay in seconds. <default is 1 sec>");

    SYSCTL_ADD_INT(sysctl_ctx, SYSCTL_CHILDREN(sysctl_tree),
        OID_AUTO, "reset_in_progress", CTLFLAG_RD,
        &sc->reset_in_progress, 0, "ocr in progress status");

}

/**
 * mrsas_get_tunables:  get tunable parameters.
 * input:               Adapter instance soft state
 *
 * Get tunable parameters. This will help to debug driver at boot time.
 */
static void
mrsas_get_tunables(struct mrsas_softc *sc)
{
    char tmpstr[80];

    /* XXX default to some debugging for now */
    sc->mrsas_debug = MRSAS_FAULT;
    sc->mrsas_io_timeout = MRSAS_IO_TIMEOUT;
    sc->mrsas_fw_fault_check_delay = 1;
    sc->reset_count = 0;
    sc->reset_in_progress = 0;

    /*
     * Grab the global variables.
     */
    TUNABLE_INT_FETCH("hw.mrsas.debug_level", &sc->mrsas_debug);

    /* Grab the unit-instance variables */
    ksnprintf(tmpstr, sizeof(tmpstr), "dev.mrsas.%d.debug_level",
        device_get_unit(sc->mrsas_dev));
    TUNABLE_INT_FETCH(tmpstr, &sc->mrsas_debug);
}

/**
 * mrsas_alloc_evt_log_info cmd:	Allocates memory to get event log information.
 * 								  	Used to get sequence number at driver load time.
 * input:                      	  	Adapter soft state
 *
 * Allocates DMAable memory for the event log info internal command.
 */
int mrsas_alloc_evt_log_info_cmd(struct mrsas_softc *sc)
{
    int el_info_size;

    /* Allocate get event log info command */
    el_info_size = sizeof(struct mrsas_evt_log_info);
    if (bus_dma_tag_create( sc->mrsas_parent_tag,   // parent
                            1, 0,                   // algnmnt, boundary
                            BUS_SPACE_MAXADDR_32BIT,// lowaddr
                            BUS_SPACE_MAXADDR,      // highaddr
                            NULL, NULL,             // filter, filterarg
                            el_info_size,          // maxsize
                            1,                      // msegments
                            el_info_size,          // maxsegsize
                            BUS_DMA_ALLOCNOW,       // flags
                            &sc->el_info_tag)) {
        device_printf(sc->mrsas_dev, "Cannot allocate event log info tag\n");
        return (ENOMEM);
    }
    if (bus_dmamem_alloc(sc->el_info_tag, (void **)&sc->el_info_mem,
            BUS_DMA_NOWAIT, &sc->el_info_dmamap)) {
        device_printf(sc->mrsas_dev, "Cannot allocate event log info cmd mem\n");
        return (ENOMEM);
    }
    if (bus_dmamap_load(sc->el_info_tag, sc->el_info_dmamap,
            sc->el_info_mem, el_info_size, mrsas_addr_cb,
            &sc->el_info_phys_addr, BUS_DMA_NOWAIT)) {
        device_printf(sc->mrsas_dev, "Cannot load event log info cmd mem\n");
        return (ENOMEM);
    }

    memset(sc->el_info_mem, 0, el_info_size);
    return (0);
}

/**
 * mrsas_free_evt_info_cmd: 	Free memory for Event log info command 
 * input:                    	Adapter soft state
 *
 * Deallocates memory for the event log info internal command.
 */
void mrsas_free_evt_log_info_cmd(struct mrsas_softc *sc)
{
    if (sc->el_info_phys_addr)
        bus_dmamap_unload(sc->el_info_tag, sc->el_info_dmamap);
    if (sc->el_info_mem != NULL)
        bus_dmamem_free(sc->el_info_tag, sc->el_info_mem, sc->el_info_dmamap);
    if (sc->el_info_tag != NULL)
        bus_dma_tag_destroy(sc->el_info_tag);
}

/**
 *  mrsas_get_seq_num:	Get latest event sequence number
 *  @sc:				Adapter soft state
 *  @eli:				Firmware event log sequence number information.
 *						Firmware maintains a log of all events in a non-volatile area.
 *						Driver get the sequence number using DCMD
 *						"MR_DCMD_CTRL_EVENT_GET_INFO" at driver load time.
 */

static int
mrsas_get_seq_num(struct mrsas_softc *sc,
		    struct mrsas_evt_log_info *eli)
{
	struct mrsas_mfi_cmd *cmd;
	struct mrsas_dcmd_frame *dcmd;

	cmd =  mrsas_get_mfi_cmd(sc);

	if (!cmd) {
		device_printf(sc->mrsas_dev, "Failed to get a free cmd\n");
		return -ENOMEM;
	}

	dcmd = &cmd->frame->dcmd;

	if (mrsas_alloc_evt_log_info_cmd(sc) != SUCCESS) {
		device_printf(sc->mrsas_dev, "Cannot allocate evt log info cmd\n");
		mrsas_release_mfi_cmd(cmd);
		return -ENOMEM;
	}
	
	memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);

	dcmd->cmd = MFI_CMD_DCMD;
	dcmd->cmd_status = 0x0;
	dcmd->sge_count = 1;
	dcmd->flags = MFI_FRAME_DIR_READ;
	dcmd->timeout = 0;
	dcmd->pad_0 = 0;
	dcmd->data_xfer_len = sizeof(struct mrsas_evt_log_info);
	dcmd->opcode = MR_DCMD_CTRL_EVENT_GET_INFO;
	dcmd->sgl.sge32[0].phys_addr = sc->el_info_phys_addr;
	dcmd->sgl.sge32[0].length = sizeof(struct mrsas_evt_log_info);

	mrsas_issue_blocked_cmd(sc, cmd);

	/*
 	 * Copy the data back into callers buffer
 	 */
	memcpy(eli, sc->el_info_mem, sizeof(struct mrsas_evt_log_info));
	mrsas_free_evt_log_info_cmd(sc);
	mrsas_release_mfi_cmd(cmd);

	return 0;
}


/**
 *  mrsas_register_aen:		Register for asynchronous event notification
 *  @sc:					Adapter soft state
 *  @seq_num:				Starting sequence number
 *  @class_locale:			Class of the event
 *  						This function subscribes for events beyond the @seq_num 
 *  						and type @class_locale.
 * 
 * */
static int
mrsas_register_aen(struct mrsas_softc *sc, u_int32_t seq_num,
		     u_int32_t class_locale_word)
{
	int ret_val;
	struct mrsas_mfi_cmd *cmd;
	struct mrsas_dcmd_frame *dcmd;
	union mrsas_evt_class_locale curr_aen;
	union mrsas_evt_class_locale prev_aen;

/*
 *  If there an AEN pending already (aen_cmd), check if the
 *  class_locale of that pending AEN is inclusive of the new
 *  AEN request we currently have. If it is, then we don't have
 *  to do anything. In other words, whichever events the current
 *  AEN request is subscribing to, have already been subscribed
 *  to.
 *  If the old_cmd is _not_ inclusive, then we have to abort
 *  that command, form a class_locale that is superset of both
 *  old and current and re-issue to the FW
 * */

	curr_aen.word = class_locale_word;

	if (sc->aen_cmd) {

		prev_aen.word = sc->aen_cmd->frame->dcmd.mbox.w[1];

/*
 * A class whose enum value is smaller is inclusive of all
 * higher values. If a PROGRESS (= -1) was previously
 * registered, then a new registration requests for higher
 * classes need not be sent to FW. They are automatically
 * included.
 * Locale numbers don't have such hierarchy. They are bitmap values
 */
		if ((prev_aen.members.class <= curr_aen.members.class) &&
	    	!((prev_aen.members.locale & curr_aen.members.locale) ^
	      	curr_aen.members.locale)) {
			/*
  			 * Previously issued event registration includes
  			 * current request. Nothing to do.
  			 */
			return 0;
		} else {
			curr_aen.members.locale |= prev_aen.members.locale;

			if (prev_aen.members.class < curr_aen.members.class)
				curr_aen.members.class = prev_aen.members.class;

			sc->aen_cmd->abort_aen = 1;
			ret_val = mrsas_issue_blocked_abort_cmd(sc,
				  sc->aen_cmd);

			if (ret_val) {
				kprintf("mrsas: Failed to abort "
					   "previous AEN command\n");
				return ret_val;
			}
		}
	}

	cmd =  mrsas_get_mfi_cmd(sc);

	if (!cmd)
		return -ENOMEM;

	dcmd = &cmd->frame->dcmd;

	memset(sc->evt_detail_mem, 0, sizeof(struct mrsas_evt_detail));

/*
 * Prepare DCMD for aen registration
 */
	memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);

	dcmd->cmd = MFI_CMD_DCMD;
	dcmd->cmd_status = 0x0;
	dcmd->sge_count = 1;
	dcmd->flags = MFI_FRAME_DIR_READ;
	dcmd->timeout = 0;
	dcmd->pad_0 = 0;
	dcmd->data_xfer_len = sizeof(struct mrsas_evt_detail);
	dcmd->opcode = MR_DCMD_CTRL_EVENT_WAIT;
	dcmd->mbox.w[0] = seq_num;
    sc->last_seq_num = seq_num;
	dcmd->mbox.w[1] = curr_aen.word;
	dcmd->sgl.sge32[0].phys_addr = (u_int32_t) sc->evt_detail_phys_addr;
	dcmd->sgl.sge32[0].length = sizeof(struct mrsas_evt_detail);

	if (sc->aen_cmd != NULL) {
		mrsas_release_mfi_cmd(cmd);
		return 0;
	}

	/*
  	 * Store reference to the cmd used to register for AEN. When an
  	 * application wants us to register for AEN, we have to abort this
   	 * cmd and re-register with a new EVENT LOCALE supplied by that app
  	 */
	sc->aen_cmd = cmd;

	/*
  	  Issue the aen registration frame
  	*/
  	if (mrsas_issue_dcmd(sc, cmd)){
       	device_printf(sc->mrsas_dev, "Cannot issue AEN DCMD command.\n");
       	return(1);
   	}

	return 0;
}
/**
 * mrsas_start_aen -  Subscribes to AEN during driver load time
 * @instance:           Adapter soft state
 */
static int mrsas_start_aen(struct mrsas_softc *sc)
{
	struct mrsas_evt_log_info eli;
	union mrsas_evt_class_locale class_locale;


	/* Get the latest sequence number from FW*/
			
	memset(&eli, 0, sizeof(eli));

	if (mrsas_get_seq_num(sc, &eli))
		return -1;

	/* Register AEN with FW for latest sequence number plus 1*/
	class_locale.members.reserved = 0;
	class_locale.members.locale = MR_EVT_LOCALE_ALL;
	class_locale.members.class = MR_EVT_CLASS_DEBUG;

	return mrsas_register_aen(sc, eli.newest_seq_num + 1,
				class_locale.word);
}

/**
 * mrsas_attach:            PCI entry point
 * input:                   device struct pointer 
 * 
 * Performs setup of PCI and registers, initializes mutexes and
 * linked lists, registers interrupts and CAM, and initializes   
 * the adapter/controller to its proper state.
 */
static int mrsas_attach(device_t dev)
{
    struct mrsas_softc *sc = device_get_softc(dev);
    uint32_t cmd, bar, error;

    /* Look up our softc and initialize its fields. */
    sc->mrsas_dev = dev;
    sc->device_id = pci_get_device(dev);

    mrsas_get_tunables(sc);

    /* 
     * Set up PCI and registers 
     */
    cmd = pci_read_config(dev, PCIR_COMMAND, 2);
    if ( (cmd & PCIM_CMD_PORTEN) == 0) {
        return (ENXIO);
    }
    /* Force the busmaster enable bit on. */
    cmd |= PCIM_CMD_BUSMASTEREN;
    pci_write_config(dev, PCIR_COMMAND, cmd, 2);

    //bar = pci_read_config(dev, MRSAS_PCI_BAR0, 4);
    bar = pci_read_config(dev, MRSAS_PCI_BAR1, 4);

    sc->reg_res_id = MRSAS_PCI_BAR1; /* BAR1 offset */
    if ((sc->reg_res = bus_alloc_resource(dev, SYS_RES_MEMORY,
                                &(sc->reg_res_id), 0, ~0, 1, RF_ACTIVE))
                                == NULL) {
        device_printf(dev, "Cannot allocate PCI registers\n");
        goto attach_fail;
    }
    sc->bus_tag = rman_get_bustag(sc->reg_res);
    sc->bus_handle = rman_get_bushandle(sc->reg_res);

    /* Intialize mutexes */
    lockinit(&sc->sim_lock,  "mrsas_sim_lock", 0, LK_CANRECURSE);
    lockinit(&sc->pci_lock,  "mrsas_pci_lock", 0, LK_CANRECURSE);
    lockinit(&sc->io_lock,  "mrsas_io_lock", 0, LK_CANRECURSE);
    lockinit(&sc->aen_lock,  "mrsas_aen_lock", 0, LK_CANRECURSE);
    spin_init(&sc->ioctl_lock, "mrsasioctl");
    lockinit(&sc->mpt_cmd_pool_lock, "mrsas_mpt_cmd_pool_lock", 0,
	LK_CANRECURSE);
    lockinit(&sc->mfi_cmd_pool_lock, "mrsas_mfi_cmd_pool_lock", 0,
	LK_CANRECURSE);
    lockinit(&sc->raidmap_lock, "mrsas_raidmap_lock", 0, LK_CANRECURSE);

    /* Intialize linked list */
    TAILQ_INIT(&sc->mrsas_mpt_cmd_list_head);
    TAILQ_INIT(&sc->mrsas_mfi_cmd_list_head);

    atomic_set(&sc->fw_outstanding,0);

	sc->io_cmds_highwater = 0;

    /* Create a /dev entry for this device. */
    sc->mrsas_cdev = make_dev(&mrsas_ops, device_get_unit(dev), UID_ROOT,
        GID_OPERATOR, (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP), "mrsas%u",
        device_get_unit(dev));
    if (sc->mrsas_cdev)
    	sc->mrsas_cdev->si_drv1 = sc;

    sc->adprecovery = MRSAS_HBA_OPERATIONAL;
	sc->UnevenSpanSupport = 0;

    /* Initialize Firmware */
    if (mrsas_init_fw(sc) != SUCCESS) {
        goto attach_fail_fw;
    }

    /* Register SCSI mid-layer */
    if ((mrsas_cam_attach(sc) != SUCCESS)) {
        goto attach_fail_cam;
    }

    /* Register IRQs */
    if (mrsas_setup_irq(sc) != SUCCESS) {
        goto attach_fail_irq;
    }

    /* Enable Interrupts */
    mrsas_enable_intr(sc);

    error = kthread_create(mrsas_ocr_thread, sc, &sc->ocr_thread, "mrsas_ocr%d",
        device_get_unit(sc->mrsas_dev));
    if (error) {
        kprintf("Error %d starting rescan thread\n", error);
        goto attach_fail_irq;
    }

    mrsas_setup_sysctl(sc);
        
	/* Initiate AEN (Asynchronous Event Notification)*/

	if (mrsas_start_aen(sc)) {
		kprintf("Error: start aen failed\n");
		goto fail_start_aen;
	}

    return (0);

fail_start_aen:
attach_fail_irq:
    mrsas_teardown_intr(sc);
attach_fail_cam:
    mrsas_cam_detach(sc);
attach_fail_fw:
//attach_fail_raidmap:
    mrsas_free_mem(sc);
    lockuninit(&sc->sim_lock);
    lockuninit(&sc->aen_lock);
    lockuninit(&sc->pci_lock);
    lockuninit(&sc->io_lock);
    spin_uninit(&sc->ioctl_lock);
    lockuninit(&sc->mpt_cmd_pool_lock);
    lockuninit(&sc->mfi_cmd_pool_lock);
    lockuninit(&sc->raidmap_lock);
attach_fail:
    destroy_dev(sc->mrsas_cdev);
    if (sc->reg_res){
        bus_release_resource(sc->mrsas_dev, SYS_RES_MEMORY,
                             sc->reg_res_id, sc->reg_res);
    }
    return (ENXIO);
}

/**
 * mrsas_detach:            De-allocates and teardown resources
 * input:                   device struct pointer 
 * 
 * This function is the entry point for device disconnect and detach.  It
 * performs memory de-allocations, shutdown of the controller and various 
 * teardown and destroy resource functions.
 */
static int mrsas_detach(device_t dev)
{
    struct mrsas_softc *sc;
    int i = 0;

    sc = device_get_softc(dev);
    sc->remove_in_progress = 1;
    if(sc->ocr_thread_active)
        wakeup(&sc->ocr_chan);
    while(sc->reset_in_progress){
        i++;
        if (!(i % MRSAS_RESET_NOTICE_INTERVAL)) {
            mrsas_dprint(sc, MRSAS_INFO,
                "[%2d]waiting for ocr to be finished\n",i);
        }
        tsleep(mrsas_detach, 0, "mr_shutdown", hz);
    }
    i = 0;
    while(sc->ocr_thread_active){
        i++;
        if (!(i % MRSAS_RESET_NOTICE_INTERVAL)) {
            mrsas_dprint(sc, MRSAS_INFO,
                "[%2d]waiting for "
                "mrsas_ocr thread to quit ocr %d\n",i,
                 sc->ocr_thread_active);
        }
        tsleep(mrsas_detach, 0, "mr_shutdown", hz);
    }
    mrsas_flush_cache(sc);
    mrsas_shutdown_ctlr(sc, MR_DCMD_CTRL_SHUTDOWN);
    mrsas_disable_intr(sc);
    mrsas_cam_detach(sc);
    mrsas_teardown_intr(sc);
    mrsas_free_mem(sc);
    lockuninit(&sc->sim_lock);
    lockuninit(&sc->aen_lock);
    lockuninit(&sc->pci_lock);
    lockuninit(&sc->io_lock);
    spin_uninit(&sc->ioctl_lock);
    lockuninit(&sc->mpt_cmd_pool_lock);
    lockuninit(&sc->mfi_cmd_pool_lock);
    lockuninit(&sc->raidmap_lock);
    if (sc->reg_res){
        bus_release_resource(sc->mrsas_dev,
                 SYS_RES_MEMORY, sc->reg_res_id, sc->reg_res);
    }
    destroy_dev(sc->mrsas_cdev);
    if (sc->sysctl_tree != NULL)
        sysctl_ctx_free(&sc->sysctl_ctx);
    return (0);
}

/**
 * mrsas_free_mem:          Frees allocated memory 
 * input:                   Adapter instance soft state
 * 
 * This function is called from mrsas_detach() to free previously allocated
 * memory.  
 */
void mrsas_free_mem(struct mrsas_softc *sc)
{
    int i;
    u_int32_t max_cmd;
    struct mrsas_mfi_cmd *mfi_cmd;
    struct mrsas_mpt_cmd *mpt_cmd;
    
	/*
     * Free RAID map memory
     */
    for (i=0; i < 2; i++)
    {
        if (sc->raidmap_phys_addr[i])
            bus_dmamap_unload(sc->raidmap_tag[i], sc->raidmap_dmamap[i]);
        if (sc->raidmap_mem[i] != NULL)
            bus_dmamem_free(sc->raidmap_tag[i], sc->raidmap_mem[i], sc->raidmap_dmamap[i]);
        if (sc->raidmap_tag[i] != NULL)
            bus_dma_tag_destroy(sc->raidmap_tag[i]);
    }

    /* 
     * Free version buffer memroy 
     */
    if (sc->verbuf_phys_addr)
        bus_dmamap_unload(sc->verbuf_tag, sc->verbuf_dmamap);
    if (sc->verbuf_mem != NULL)
        bus_dmamem_free(sc->verbuf_tag, sc->verbuf_mem, sc->verbuf_dmamap);
    if (sc->verbuf_tag != NULL)
        bus_dma_tag_destroy(sc->verbuf_tag);
	

    /* 
     * Free sense buffer memory 
     */
    if (sc->sense_phys_addr)
        bus_dmamap_unload(sc->sense_tag, sc->sense_dmamap);
    if (sc->sense_mem != NULL)
        bus_dmamem_free(sc->sense_tag, sc->sense_mem, sc->sense_dmamap);
    if (sc->sense_tag != NULL)
        bus_dma_tag_destroy(sc->sense_tag);

    /* 
     * Free chain frame memory 
     */
    if (sc->chain_frame_phys_addr)
        bus_dmamap_unload(sc->chain_frame_tag, sc->chain_frame_dmamap);
    if (sc->chain_frame_mem != NULL)
        bus_dmamem_free(sc->chain_frame_tag, sc->chain_frame_mem, sc->chain_frame_dmamap);
    if (sc->chain_frame_tag != NULL)
        bus_dma_tag_destroy(sc->chain_frame_tag);

    /* 
     * Free IO Request memory 
     */
    if (sc->io_request_phys_addr)
        bus_dmamap_unload(sc->io_request_tag, sc->io_request_dmamap);
    if (sc->io_request_mem != NULL)
        bus_dmamem_free(sc->io_request_tag, sc->io_request_mem, sc->io_request_dmamap);
    if (sc->io_request_tag != NULL)
        bus_dma_tag_destroy(sc->io_request_tag);

    /* 
     * Free Reply Descriptor memory 
     */
    if (sc->reply_desc_phys_addr)
        bus_dmamap_unload(sc->reply_desc_tag, sc->reply_desc_dmamap);
    if (sc->reply_desc_mem != NULL)
        bus_dmamem_free(sc->reply_desc_tag, sc->reply_desc_mem, sc->reply_desc_dmamap);
    if (sc->reply_desc_tag != NULL)
        bus_dma_tag_destroy(sc->reply_desc_tag);

    /* 
     * Free event detail memory 
     */
    if (sc->evt_detail_phys_addr)
        bus_dmamap_unload(sc->evt_detail_tag, sc->evt_detail_dmamap);
    if (sc->evt_detail_mem != NULL)
        bus_dmamem_free(sc->evt_detail_tag, sc->evt_detail_mem, sc->evt_detail_dmamap);
    if (sc->evt_detail_tag != NULL)
        bus_dma_tag_destroy(sc->evt_detail_tag);

    /* 
     * Free MFI frames 
     */
	if (sc->mfi_cmd_list) {
    	for (i = 0; i < MRSAS_MAX_MFI_CMDS; i++) {
        	mfi_cmd = sc->mfi_cmd_list[i];
        	mrsas_free_frame(sc, mfi_cmd);
		}
    }
    if (sc->mficmd_frame_tag != NULL)
        bus_dma_tag_destroy(sc->mficmd_frame_tag);

    /* 
     * Free MPT internal command list 
     */
    max_cmd = sc->max_fw_cmds;
	if (sc->mpt_cmd_list) {
    	for (i = 0; i < max_cmd; i++) {
        	mpt_cmd = sc->mpt_cmd_list[i];
        	bus_dmamap_destroy(sc->data_tag, mpt_cmd->data_dmamap); 
        	kfree(sc->mpt_cmd_list[i], M_MRSAS);
    	}
    	kfree(sc->mpt_cmd_list, M_MRSAS);
    	sc->mpt_cmd_list = NULL;
	}

    /*
     * Free MFI internal command list 
     */
	
	if (sc->mfi_cmd_list) {
    	for (i = 0; i < MRSAS_MAX_MFI_CMDS; i++) {
        	kfree(sc->mfi_cmd_list[i], M_MRSAS);
    	}
    	kfree(sc->mfi_cmd_list, M_MRSAS);
    	sc->mfi_cmd_list = NULL;
	}

    /* 
     * Free request descriptor memory 
     */
    kfree(sc->req_desc, M_MRSAS);
    sc->req_desc = NULL;

    /* 
     * Destroy parent tag 
     */
    if (sc->mrsas_parent_tag != NULL)
        bus_dma_tag_destroy(sc->mrsas_parent_tag);
}

/**
 * mrsas_teardown_intr:        Teardown interrupt 
 * input:                      Adapter instance soft state
 *
 * This function is called from mrsas_detach() to teardown and release
 * bus interrupt resourse.
 */
void mrsas_teardown_intr(struct mrsas_softc *sc)
{
    if (sc->intr_handle)
        bus_teardown_intr(sc->mrsas_dev, sc->mrsas_irq, sc->intr_handle);
    if (sc->mrsas_irq != NULL)
        bus_release_resource(sc->mrsas_dev, SYS_RES_IRQ, sc->irq_id, sc->mrsas_irq);
    if (sc->irq_type == PCI_INTR_TYPE_MSI)
        pci_release_msi(sc->mrsas_dev);
    sc->intr_handle = NULL;
}

/**
 * mrsas_suspend:          Suspend entry point
 * input:                  Device struct pointer 
 * 
 * This function is the entry point for system suspend from the OS.   
 */
static int mrsas_suspend(device_t dev)
{
    struct mrsas_softc *sc;

    sc = device_get_softc(dev);
    return (0);
}

/**
 * mrsas_resume:           Resume entry point 
 * input:                  Device struct pointer 
 * 
 * This function is the entry point for system resume from the OS.   
 */
static int mrsas_resume(device_t dev)
{
    struct mrsas_softc *sc;

    sc = device_get_softc(dev);
    return (0);
}

/**
 * mrsas_ioctl:       IOCtl commands entry point. 
 * 
 * This function is the entry point for IOCtls from the OS.  It calls the 
 * appropriate function for processing depending on the command received.
 */
static int
mrsas_ioctl(struct dev_ioctl_args *ap)
{
    cdev_t dev = ap->a_head.a_dev;
    u_long cmd = ap->a_cmd;
    caddr_t arg = ap->a_data;
    struct mrsas_softc *sc;
    int ret = 0, i = 0; 

    sc = (struct mrsas_softc *)(dev->si_drv1);
    
    if (sc->remove_in_progress) {
        mrsas_dprint(sc, MRSAS_INFO,
            "Driver remove or shutdown called.\n");
        return ENOENT;
    }
   
    spin_lock(&sc->ioctl_lock);
    if (!sc->reset_in_progress) {
        spin_unlock(&sc->ioctl_lock);
        goto do_ioctl;
    }

    /* Release ioclt_lock, and wait for OCR
     * to be finished */
    spin_unlock(&sc->ioctl_lock);
    while(sc->reset_in_progress){
        i++;
        if (!(i % MRSAS_RESET_NOTICE_INTERVAL)) {
            mrsas_dprint(sc, MRSAS_INFO,
                "[%2d]waiting for "
                "OCR to be finished %d\n",i,
                 sc->ocr_thread_active);
        }
        tsleep(mrsas_ioctl, 0, "mr_ioctl", hz);
    }

do_ioctl:
    switch (cmd) {
        case MRSAS_IOC_FIRMWARE_PASS_THROUGH:
            ret = mrsas_passthru(sc, (void *)arg);
            break;
        case MRSAS_IOC_SCAN_BUS:
            ret = mrsas_bus_scan(sc);
            break;
    }
 
    return (ret);
}

/**
 * mrsas_setup_irq:   Set up interrupt. 
 * input:             Adapter instance soft state
 * 
 * This function sets up interrupts as a bus resource, with flags indicating
 * resource permitting contemporaneous sharing and for resource to activate 
 * atomically.
 */
static int mrsas_setup_irq(struct mrsas_softc *sc)
{
    u_int irq_flags;

    sc->irq_id = 0;
    sc->irq_type = pci_alloc_1intr(sc->mrsas_dev, mrsas_msi_enable,
        &sc->irq_id, &irq_flags);

    sc->mrsas_irq = bus_alloc_resource_any(sc->mrsas_dev, SYS_RES_IRQ,
        &sc->irq_id, irq_flags);
    if (sc->mrsas_irq == NULL){
        device_printf(sc->mrsas_dev, "Cannot allocate interrupt\n");
        return (FAIL);
    }
    if (bus_setup_intr(sc->mrsas_dev, sc->mrsas_irq, INTR_MPSAFE,
                       mrsas_isr, sc, &sc->intr_handle, NULL)) {
        device_printf(sc->mrsas_dev, "Cannot set up interrupt\n");
        return (FAIL);
    }

    return (0);
}

/*
 * mrsas_isr:        ISR entry point 
 * input:            argument pointer 
 *
 * This function is the interrupt service routine entry point.  There
 * are two types of interrupts, state change interrupt and response
 * interrupt.  If an interrupt is not ours, we just return.
 */
void mrsas_isr(void *arg)
{
    struct mrsas_softc *sc = (struct mrsas_softc *)arg;
    int status;

    /* Clear FW state change interrupt */
    status = mrsas_clear_intr(sc);

    /* Not our interrupt */
    if (!status)
        return;
    
    /* If we are resetting, bail */
    if (test_bit(MRSAS_FUSION_IN_RESET, &sc->reset_flags)) {
        kprintf(" Entered into ISR when OCR is going active. \n");
        mrsas_clear_intr(sc);
        return;
    }
    /* Process for reply request and clear response interrupt */
    if (mrsas_complete_cmd(sc) != SUCCESS) 
        mrsas_clear_intr(sc);

    return;
}

/*
 * mrsas_complete_cmd:        Process reply request  
 * input:                     Adapter instance soft state
 *
 * This function is called from mrsas_isr() to process reply request and 
 * clear response interrupt. Processing of the reply request entails
 * walking through the reply descriptor array for the command request  
 * pended from Firmware.  We look at the Function field to determine
 * the command type and perform the appropriate action.  Before we
 * return, we clear the response interrupt.
 */
static int mrsas_complete_cmd(struct mrsas_softc *sc)
{
    Mpi2ReplyDescriptorsUnion_t *desc;
    MPI2_SCSI_IO_SUCCESS_REPLY_DESCRIPTOR *reply_desc;
    MRSAS_RAID_SCSI_IO_REQUEST  *scsi_io_req;
    struct mrsas_mpt_cmd *cmd_mpt;
    struct mrsas_mfi_cmd *cmd_mfi;
    u_int8_t arm, reply_descript_type;
    u_int16_t smid, num_completed;
    u_int8_t status, extStatus;
    union desc_value desc_val;
    PLD_LOAD_BALANCE_INFO lbinfo;
    u_int32_t device_id;
    int threshold_reply_count = 0;


    /* If we have a hardware error, not need to continue */
    if (sc->adprecovery == MRSAS_HW_CRITICAL_ERROR)
        return (DONE);

    desc = sc->reply_desc_mem;
    desc += sc->last_reply_idx;

    reply_desc = (MPI2_SCSI_IO_SUCCESS_REPLY_DESCRIPTOR *)desc;

    desc_val.word = desc->Words;
    num_completed = 0;

    reply_descript_type = reply_desc->ReplyFlags & MPI2_RPY_DESCRIPT_FLAGS_TYPE_MASK;

    /* Find our reply descriptor for the command and process */
    while((desc_val.u.low != 0xFFFFFFFF) && (desc_val.u.high != 0xFFFFFFFF)) 
    {
        smid = reply_desc->SMID;
        cmd_mpt = sc->mpt_cmd_list[smid -1];
        scsi_io_req = (MRSAS_RAID_SCSI_IO_REQUEST *)cmd_mpt->io_request;

        status = scsi_io_req->RaidContext.status;
        extStatus = scsi_io_req->RaidContext.exStatus;
       
        switch (scsi_io_req->Function)
        {
            case MPI2_FUNCTION_SCSI_IO_REQUEST :  /*Fast Path IO.*/
                device_id = cmd_mpt->ccb_ptr->ccb_h.target_id;
                lbinfo = &sc->load_balance_info[device_id];
                if (cmd_mpt->load_balance == MRSAS_LOAD_BALANCE_FLAG) {
                    arm = lbinfo->raid1DevHandle[0] == scsi_io_req->DevHandle ? 0 : 1;
                    atomic_dec(&lbinfo->scsi_pending_cmds[arm]);
                    cmd_mpt->load_balance &= ~MRSAS_LOAD_BALANCE_FLAG;
                }
                //Fall thru and complete IO
            case MRSAS_MPI2_FUNCTION_LD_IO_REQUEST:
                mrsas_map_mpt_cmd_status(cmd_mpt, status, extStatus);
                mrsas_cmd_done(sc, cmd_mpt);
                scsi_io_req->RaidContext.status = 0;
                scsi_io_req->RaidContext.exStatus = 0;
                atomic_dec(&sc->fw_outstanding);
                break;
            case MRSAS_MPI2_FUNCTION_PASSTHRU_IO_REQUEST: /*MFI command */
                cmd_mfi = sc->mfi_cmd_list[cmd_mpt->sync_cmd_idx];
                mrsas_complete_mptmfi_passthru(sc, cmd_mfi, status);
                cmd_mpt->flags = 0;
                mrsas_release_mpt_cmd(cmd_mpt);
                break;
        }

        sc->last_reply_idx++;
        if (sc->last_reply_idx >= sc->reply_q_depth) 
            sc->last_reply_idx = 0;

        desc->Words = ~((uint64_t)0x00); /* set it back to all 0xFFFFFFFFs */
        num_completed++;
        threshold_reply_count++;

        /* Get the next reply descriptor */
        if (!sc->last_reply_idx)
            desc = sc->reply_desc_mem;
        else
            desc++;

        reply_desc = (MPI2_SCSI_IO_SUCCESS_REPLY_DESCRIPTOR *)desc;
        desc_val.word = desc->Words;

        reply_descript_type = reply_desc->ReplyFlags & MPI2_RPY_DESCRIPT_FLAGS_TYPE_MASK;

        if(reply_descript_type == MPI2_RPY_DESCRIPT_FLAGS_UNUSED)
            break;

        /* 
         * Write to reply post index after completing threshold reply count 
         * and still there are more replies in reply queue pending to be 
         * completed.
         */
        if (threshold_reply_count >= THRESHOLD_REPLY_COUNT) {
            mrsas_write_reg(sc, offsetof(mrsas_reg_set, reply_post_host_index),
                            sc->last_reply_idx);
            threshold_reply_count = 0;
        }
    }

    /* No match, just return */
    if (num_completed == 0)
        return (DONE);

    /* Clear response interrupt */
    mrsas_write_reg(sc, offsetof(mrsas_reg_set, reply_post_host_index),sc->last_reply_idx); 

    return(0);
}

/*
 * mrsas_map_mpt_cmd_status:  Allocate DMAable memory.
 * input:                     Adapter instance soft state
 *
 * This function is called from mrsas_complete_cmd(), for LD IO and FastPath IO.
 * It checks the command status and maps the appropriate CAM status for the CCB.   
 */
void mrsas_map_mpt_cmd_status(struct mrsas_mpt_cmd *cmd, u_int8_t status, u_int8_t extStatus)
{
    struct mrsas_softc *sc = cmd->sc;
    u_int8_t *sense_data;

    switch (status) {
        case MFI_STAT_OK:
            cmd->ccb_ptr->ccb_h.status = CAM_REQ_CMP;
            break;
        case MFI_STAT_SCSI_IO_FAILED:
        case MFI_STAT_SCSI_DONE_WITH_ERROR:
            cmd->ccb_ptr->ccb_h.status = CAM_SCSI_STATUS_ERROR;
            sense_data = (u_int8_t *)&cmd->ccb_ptr->csio.sense_data;
            if (sense_data) {
                /* For now just copy 18 bytes back */
                memcpy(sense_data, cmd->sense, 18);
                cmd->ccb_ptr->csio.sense_len = 18;
                cmd->ccb_ptr->ccb_h.status |= CAM_AUTOSNS_VALID;
            }
            break;
        case MFI_STAT_LD_OFFLINE:
        case MFI_STAT_DEVICE_NOT_FOUND:
            if (cmd->ccb_ptr->ccb_h.target_lun) 
                cmd->ccb_ptr->ccb_h.status |= CAM_LUN_INVALID;
            else
                cmd->ccb_ptr->ccb_h.status |= CAM_DEV_NOT_THERE;
            break;
        case MFI_STAT_CONFIG_SEQ_MISMATCH:
            /*send status to CAM layer to retry sending  command without 
             * decrementing retry counter*/
            cmd->ccb_ptr->ccb_h.status |= CAM_REQUEUE_REQ;
            break;
        default:
            device_printf(sc->mrsas_dev, "FW cmd complete status %x\n", status);
            cmd->ccb_ptr->ccb_h.status = CAM_REQ_CMP_ERR;
            cmd->ccb_ptr->csio.scsi_status = status;
    }
    return;
}

/*
 * mrsas_alloc_mem:  Allocate DMAable memory.
 * input:            Adapter instance soft state
 *
 * This function creates the parent DMA tag and allocates DMAable memory.
 * DMA tag describes constraints of DMA mapping. Memory allocated is mapped
 * into Kernel virtual address. Callback argument is physical memory address. 
 */
static int mrsas_alloc_mem(struct mrsas_softc *sc)
{
    u_int32_t verbuf_size, io_req_size, reply_desc_size, sense_size,
              chain_frame_size, evt_detail_size;

    /*
     * Allocate parent DMA tag
     */ 
    if (bus_dma_tag_create(NULL,                   /* parent */
                           1,         /* alignment */
                           0,                      /* boundary */
                           BUS_SPACE_MAXADDR,     /* lowaddr */
                           BUS_SPACE_MAXADDR,      /* highaddr */
                           NULL, NULL,             /* filter, filterarg */
                           MRSAS_MAX_IO_SIZE,/* maxsize */
                           MRSAS_MAX_SGL, /* nsegments */
                           MRSAS_MAX_IO_SIZE,/* maxsegsize */
                           0,                      /* flags */
                           &sc->mrsas_parent_tag   /* tag */
                           )) {
           device_printf(sc->mrsas_dev, "Cannot allocate parent DMA tag\n");
           return(ENOMEM);
    }

    /*
     * Allocate for version buffer
     */ 
    verbuf_size = MRSAS_MAX_NAME_LENGTH*(sizeof(bus_addr_t));
    if (bus_dma_tag_create(sc->mrsas_parent_tag,   // parent
                           1, 0,                   // algnmnt, boundary
                           BUS_SPACE_MAXADDR_32BIT,// lowaddr
                           BUS_SPACE_MAXADDR,      // highaddr
                           NULL, NULL,             // filter, filterarg
                           verbuf_size,           // maxsize
                           1,                      // msegments
                           verbuf_size,           // maxsegsize
                           BUS_DMA_ALLOCNOW,       // flags
                           &sc->verbuf_tag)) {
            device_printf(sc->mrsas_dev, "Cannot allocate verbuf DMA tag\n");
            return (ENOMEM);
    }
    if (bus_dmamem_alloc(sc->verbuf_tag, (void **)&sc->verbuf_mem,
        BUS_DMA_NOWAIT, &sc->verbuf_dmamap)) {
            device_printf(sc->mrsas_dev, "Cannot allocate verbuf memory\n");
            return (ENOMEM);
    }
    bzero(sc->verbuf_mem, verbuf_size);
    if (bus_dmamap_load(sc->verbuf_tag, sc->verbuf_dmamap, sc->verbuf_mem,
        verbuf_size, mrsas_addr_cb, &sc->verbuf_phys_addr, BUS_DMA_NOWAIT)){
            device_printf(sc->mrsas_dev, "Cannot load verbuf DMA map\n");
            return(ENOMEM);
    }

    /*
     * Allocate IO Request Frames
     */ 
    io_req_size = sc->io_frames_alloc_sz; 
    if (bus_dma_tag_create( sc->mrsas_parent_tag,   // parent
                            16, 0,                   // algnmnt, boundary
                            BUS_SPACE_MAXADDR_32BIT,// lowaddr
                            BUS_SPACE_MAXADDR,      // highaddr
                            NULL, NULL,             // filter, filterarg
                            io_req_size,            // maxsize
                            1,                      // msegments
                            io_req_size,            // maxsegsize
                            BUS_DMA_ALLOCNOW,       // flags
                            &sc->io_request_tag)) {
        device_printf(sc->mrsas_dev, "Cannot create IO request tag\n");
        return (ENOMEM);
    }
    if (bus_dmamem_alloc(sc->io_request_tag, (void **)&sc->io_request_mem,
                    BUS_DMA_NOWAIT, &sc->io_request_dmamap)) {
        device_printf(sc->mrsas_dev, "Cannot alloc IO request memory\n");
        return (ENOMEM);
    }
    bzero(sc->io_request_mem, io_req_size);
    if (bus_dmamap_load(sc->io_request_tag, sc->io_request_dmamap,
                        sc->io_request_mem, io_req_size, mrsas_addr_cb,
                        &sc->io_request_phys_addr, BUS_DMA_NOWAIT)) {
        device_printf(sc->mrsas_dev, "Cannot load IO request memory\n");
        return (ENOMEM);
    }

    /*
     * Allocate Chain Frames
     */
    chain_frame_size = sc->chain_frames_alloc_sz;
    if (bus_dma_tag_create( sc->mrsas_parent_tag,   // parent
                            4, 0,                   // algnmnt, boundary
                            BUS_SPACE_MAXADDR_32BIT,// lowaddr
                            BUS_SPACE_MAXADDR,      // highaddr
                            NULL, NULL,             // filter, filterarg
                            chain_frame_size,       // maxsize
                            1,                      // msegments
                            chain_frame_size,       // maxsegsize
                            BUS_DMA_ALLOCNOW,       // flags
                            &sc->chain_frame_tag)) {
        device_printf(sc->mrsas_dev, "Cannot create chain frame tag\n");
        return (ENOMEM);
    }
    if (bus_dmamem_alloc(sc->chain_frame_tag, (void **)&sc->chain_frame_mem,
                    BUS_DMA_NOWAIT, &sc->chain_frame_dmamap)) {
        device_printf(sc->mrsas_dev, "Cannot alloc chain frame memory\n");
        return (ENOMEM);
    }
    bzero(sc->chain_frame_mem, chain_frame_size);
    if (bus_dmamap_load(sc->chain_frame_tag, sc->chain_frame_dmamap,
                        sc->chain_frame_mem, chain_frame_size, mrsas_addr_cb,
                        &sc->chain_frame_phys_addr, BUS_DMA_NOWAIT)) {
        device_printf(sc->mrsas_dev, "Cannot load chain frame memory\n");
        return (ENOMEM);
    }

    /*
     * Allocate Reply Descriptor Array
     */ 
    reply_desc_size = sc->reply_alloc_sz; 
    if (bus_dma_tag_create( sc->mrsas_parent_tag,   // parent
                            16, 0,                   // algnmnt, boundary
                            BUS_SPACE_MAXADDR_32BIT,// lowaddr
                            BUS_SPACE_MAXADDR,      // highaddr
                            NULL, NULL,             // filter, filterarg
                            reply_desc_size,        // maxsize
                            1,                      // msegments
                            reply_desc_size,        // maxsegsize
                            BUS_DMA_ALLOCNOW,       // flags
                            &sc->reply_desc_tag)) {
        device_printf(sc->mrsas_dev, "Cannot create reply descriptor tag\n");
        return (ENOMEM);
    }
    if (bus_dmamem_alloc(sc->reply_desc_tag, (void **)&sc->reply_desc_mem,
                    BUS_DMA_NOWAIT, &sc->reply_desc_dmamap)) {
        device_printf(sc->mrsas_dev, "Cannot alloc reply descriptor memory\n");
        return (ENOMEM);
    }
    if (bus_dmamap_load(sc->reply_desc_tag, sc->reply_desc_dmamap,
                        sc->reply_desc_mem, reply_desc_size, mrsas_addr_cb,
                        &sc->reply_desc_phys_addr, BUS_DMA_NOWAIT)) {
        device_printf(sc->mrsas_dev, "Cannot load reply descriptor memory\n");
        return (ENOMEM);
    }

    /*
     * Allocate Sense Buffer Array.  Keep in lower 4GB 
     */
    sense_size = sc->max_fw_cmds * MRSAS_SENSE_LEN;
    if (bus_dma_tag_create(sc->mrsas_parent_tag,    // parent
                            64, 0,                   // algnmnt, boundary
                            BUS_SPACE_MAXADDR_32BIT,// lowaddr
                            BUS_SPACE_MAXADDR,      // highaddr
                            NULL, NULL,             // filter, filterarg
                            sense_size,             // maxsize
                            1,                      // nsegments
                            sense_size,             // maxsegsize
                            BUS_DMA_ALLOCNOW,       // flags
                            &sc->sense_tag)) {
        device_printf(sc->mrsas_dev, "Cannot allocate sense buf tag\n");
        return (ENOMEM);
    }
    if (bus_dmamem_alloc(sc->sense_tag, (void **)&sc->sense_mem,
            BUS_DMA_NOWAIT, &sc->sense_dmamap)) {
        device_printf(sc->mrsas_dev, "Cannot allocate sense buf memory\n");
        return (ENOMEM);
    }
    if (bus_dmamap_load(sc->sense_tag, sc->sense_dmamap,
            sc->sense_mem, sense_size, mrsas_addr_cb, &sc->sense_phys_addr,
            BUS_DMA_NOWAIT)){
        device_printf(sc->mrsas_dev, "Cannot load sense buf memory\n");
        return (ENOMEM);
    }

    /*
     * Allocate for Event detail structure
     */ 
    evt_detail_size = sizeof(struct mrsas_evt_detail); 
    if (bus_dma_tag_create( sc->mrsas_parent_tag,   // parent
                            1, 0,                   // algnmnt, boundary
                            BUS_SPACE_MAXADDR_32BIT,// lowaddr
                            BUS_SPACE_MAXADDR,      // highaddr
                            NULL, NULL,             // filter, filterarg
                            evt_detail_size,        // maxsize
                            1,                      // msegments
                            evt_detail_size,        // maxsegsize
                            BUS_DMA_ALLOCNOW,       // flags
                            &sc->evt_detail_tag)) {
        device_printf(sc->mrsas_dev, "Cannot create Event detail tag\n");
        return (ENOMEM);
    }
    if (bus_dmamem_alloc(sc->evt_detail_tag, (void **)&sc->evt_detail_mem,
                    BUS_DMA_NOWAIT, &sc->evt_detail_dmamap)) {
        device_printf(sc->mrsas_dev, "Cannot alloc Event detail buffer memory\n");
        return (ENOMEM);
    }
    bzero(sc->evt_detail_mem, evt_detail_size);
    if (bus_dmamap_load(sc->evt_detail_tag, sc->evt_detail_dmamap,
                        sc->evt_detail_mem, evt_detail_size, mrsas_addr_cb,
                        &sc->evt_detail_phys_addr, BUS_DMA_NOWAIT)) {
        device_printf(sc->mrsas_dev, "Cannot load Event detail buffer memory\n");
        return (ENOMEM);
    }


   /*
    * Create a dma tag for data buffers; size will be the maximum
    * possible I/O size (280kB).
    */
    if (bus_dma_tag_create(sc->mrsas_parent_tag,   // parent 
                           1,         // alignment 
                           0,                      // boundary 
                           BUS_SPACE_MAXADDR,      // lowaddr 
                           BUS_SPACE_MAXADDR,      // highaddr 
                           NULL, NULL,             // filter, filterarg 
                           MRSAS_MAX_IO_SIZE,      // maxsize 
                           MRSAS_MAX_SGL,          // nsegments 
                           MRSAS_MAX_IO_SIZE,      // maxsegsize 
                           BUS_DMA_ALLOCNOW,       // flags 
                           &sc->data_tag)) {
        device_printf(sc->mrsas_dev, "Cannot create data dma tag\n");
        return(ENOMEM);
    }

    return(0);
}

/*
 * mrsas_addr_cb:   Callback function of bus_dmamap_load()
 * input:           callback argument, 
 *                  machine dependent type that describes DMA segments,
 *                  number of segments,
 *                  error code.  
 *
 * This function is for the driver to receive mapping information resultant
 * of the bus_dmamap_load(). The information is actually not being used,
 * but the address is saved anyway.
 */
void
mrsas_addr_cb(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
{
    bus_addr_t *addr;
                                
    addr = arg;
    *addr = segs[0].ds_addr;
}

/*
 * mrsas_setup_raidmap:  Set up RAID map.
 * input:                Adapter instance soft state
 *
 * Allocate DMA memory for the RAID maps and perform setup.
 */
static int mrsas_setup_raidmap(struct mrsas_softc *sc)
{       
    sc->map_sz = sizeof(MR_FW_RAID_MAP) +
                (sizeof(MR_LD_SPAN_MAP) * (MAX_LOGICAL_DRIVES - 1));

    for (int i=0; i < 2; i++)
    {
        if (bus_dma_tag_create(sc->mrsas_parent_tag,    // parent
                            4, 0,                   // algnmnt, boundary
                            BUS_SPACE_MAXADDR_32BIT,// lowaddr
                            BUS_SPACE_MAXADDR,      // highaddr
                            NULL, NULL,             // filter, filterarg
                            sc->map_sz,             // maxsize
                            1,                      // nsegments
                            sc->map_sz,             // maxsegsize
                            BUS_DMA_ALLOCNOW,       // flags
                            &sc->raidmap_tag[i])) {
            device_printf(sc->mrsas_dev, "Cannot allocate raid map tag.\n");
            return (ENOMEM);
        }
        if (bus_dmamem_alloc(sc->raidmap_tag[i], (void **)&sc->raidmap_mem[i],
                BUS_DMA_NOWAIT, &sc->raidmap_dmamap[i])) {
            device_printf(sc->mrsas_dev, "Cannot allocate raidmap memory.\n");
            return (ENOMEM);
        }
        if (bus_dmamap_load(sc->raidmap_tag[i], sc->raidmap_dmamap[i],
                sc->raidmap_mem[i], sc->map_sz, mrsas_addr_cb, &sc->raidmap_phys_addr[i],
                BUS_DMA_NOWAIT)){
            device_printf(sc->mrsas_dev, "Cannot load raidmap memory.\n");
            return (ENOMEM);
        }
        if (!sc->raidmap_mem[i]) {
            device_printf(sc->mrsas_dev, "Cannot allocate memory for raid map.\n");
            return (ENOMEM);
        }
    }
 
    if (!mrsas_get_map_info(sc))
        mrsas_sync_map_info(sc);

    return (0);
}

/**
 * mrsas_init_fw:      Initialize Firmware   
 * input:              Adapter soft state
 *
 * Calls transition_to_ready() to make sure Firmware is in operational 
 * state and calls mrsas_init_adapter() to send IOC_INIT command to
 * Firmware.  It issues internal commands to get the controller info
 * after the IOC_INIT command response is received by Firmware.  
 * Note:  code relating to get_pdlist, get_ld_list and max_sectors 
 * are currently not being used, it is left here as placeholder. 
 */
static int mrsas_init_fw(struct mrsas_softc *sc)
{
    u_int32_t max_sectors_1;
    u_int32_t max_sectors_2;
    u_int32_t tmp_sectors;
    struct mrsas_ctrl_info *ctrl_info;

    int ret, ocr = 0;

      
    /* Make sure Firmware is ready */
    ret = mrsas_transition_to_ready(sc, ocr);
    if (ret != SUCCESS) {
        return(ret);
	}

    /* Get operational params, sge flags, send init cmd to ctlr */
    if (mrsas_init_adapter(sc) != SUCCESS){
        device_printf(sc->mrsas_dev, "Adapter initialize Fail.\n");
        return(1);
    } 

    /* Allocate internal commands for pass-thru */
    if (mrsas_alloc_mfi_cmds(sc) != SUCCESS){
        device_printf(sc->mrsas_dev, "Allocate MFI cmd failed.\n");
        return(1);
    } 
       
    if (mrsas_setup_raidmap(sc) != SUCCESS) {
        device_printf(sc->mrsas_dev, "Set up RAID map failed.\n");
        return(1);
	}

    /* For pass-thru, get PD/LD list and controller info */
    memset(sc->pd_list, 0, MRSAS_MAX_PD * sizeof(struct mrsas_pd_list));
    mrsas_get_pd_list(sc);

    memset(sc->ld_ids, 0xff, MRSAS_MAX_LD);
    mrsas_get_ld_list(sc);

	//memset(sc->log_to_span, 0, MRSAS_MAX_LD * sizeof(LD_SPAN_INFO));

    ctrl_info = kmalloc(sizeof(struct mrsas_ctrl_info), M_MRSAS, M_NOWAIT);

    /*
     * Compute the max allowed sectors per IO: The controller info has two
     * limits on max sectors. Driver should use the minimum of these two.
     *
     * 1 << stripe_sz_ops.min = max sectors per strip
     *
     * Note that older firmwares ( < FW ver 30) didn't report information
     * to calculate max_sectors_1. So the number ended up as zero always.
     */
    tmp_sectors = 0;
    if (ctrl_info && !mrsas_get_ctrl_info(sc, ctrl_info)) {
        max_sectors_1 = (1 << ctrl_info->stripe_sz_ops.min) *
                    ctrl_info->max_strips_per_io;
        max_sectors_2 = ctrl_info->max_request_size;
        tmp_sectors = min(max_sectors_1 , max_sectors_2);
        sc->disableOnlineCtrlReset = 
            ctrl_info->properties.OnOffProperties.disableOnlineCtrlReset;
        sc->UnevenSpanSupport = 
            ctrl_info->adapterOperations2.supportUnevenSpans;
        if(sc->UnevenSpanSupport) {
            device_printf(sc->mrsas_dev, "FW supports: UnevenSpanSupport=%x\n",
                sc->UnevenSpanSupport);
            if (MR_ValidateMapInfo(sc))
           	    sc->fast_path_io = 1;
            else
                sc->fast_path_io = 0;

        }
    }
    sc->max_sectors_per_req = sc->max_num_sge * MRSAS_PAGE_SIZE / 512;

    if (tmp_sectors && (sc->max_sectors_per_req > tmp_sectors))
        sc->max_sectors_per_req = tmp_sectors;

    if (ctrl_info)
        kfree(ctrl_info, M_MRSAS);
   
    return(0);
}

/**
 * mrsas_init_adapter:     Initializes the adapter/controller 
 * input:                  Adapter soft state
 *
 * Prepares for the issuing of the IOC Init cmd to FW for initializing the 
 * ROC/controller.  The FW register is read to determined the number of 
 * commands that is supported.  All memory allocations for IO is based on
 * max_cmd.  Appropriate calculations are performed in this function. 
 */
int mrsas_init_adapter(struct mrsas_softc *sc)
{
    uint32_t status;
    u_int32_t max_cmd;
    int ret;

    /* Read FW status register */
    status = mrsas_read_reg(sc, offsetof(mrsas_reg_set, outbound_scratch_pad));

    /* Get operational params from status register */
    sc->max_fw_cmds = status & MRSAS_FWSTATE_MAXCMD_MASK;

    /* Decrement the max supported by 1, to correlate with FW */
    sc->max_fw_cmds = sc->max_fw_cmds-1;
    max_cmd = sc->max_fw_cmds;

    /* Determine allocation size of command frames */
    sc->reply_q_depth = ((max_cmd *2 +1 +15)/16*16);
    sc->request_alloc_sz = sizeof(MRSAS_REQUEST_DESCRIPTOR_UNION) * max_cmd;
    sc->reply_alloc_sz = sizeof(MPI2_REPLY_DESCRIPTORS_UNION) * (sc->reply_q_depth);
    sc->io_frames_alloc_sz = MRSAS_MPI2_RAID_DEFAULT_IO_FRAME_SIZE + (MRSAS_MPI2_RAID_DEFAULT_IO_FRAME_SIZE * (max_cmd + 1));
    sc->chain_frames_alloc_sz = 1024 * max_cmd;
    sc->max_sge_in_main_msg = (MRSAS_MPI2_RAID_DEFAULT_IO_FRAME_SIZE - 
        offsetof(MRSAS_RAID_SCSI_IO_REQUEST, SGL))/16;

    sc->max_sge_in_chain = MRSAS_MAX_SZ_CHAIN_FRAME / sizeof(MPI2_SGE_IO_UNION);
    sc->max_num_sge = sc->max_sge_in_main_msg + sc->max_sge_in_chain - 2;

    /* Used for pass thru MFI frame (DCMD) */
    sc->chain_offset_mfi_pthru = offsetof(MRSAS_RAID_SCSI_IO_REQUEST, SGL)/16;

    sc->chain_offset_io_request = (MRSAS_MPI2_RAID_DEFAULT_IO_FRAME_SIZE - 
        sizeof(MPI2_SGE_IO_UNION))/16;

    sc->last_reply_idx = 0;

    ret = mrsas_alloc_mem(sc);
    if (ret != SUCCESS)
        return(ret);

    ret = mrsas_alloc_mpt_cmds(sc);
    if (ret != SUCCESS)
        return(ret);

    ret = mrsas_ioc_init(sc);
    if (ret != SUCCESS)
        return(ret);
	
    
    return(0);
}

/**
 * mrsas_alloc_ioc_cmd:   Allocates memory for IOC Init command 
 * input:                 Adapter soft state
 *
 * Allocates for the IOC Init cmd to FW to initialize the ROC/controller.
 */
int mrsas_alloc_ioc_cmd(struct mrsas_softc *sc)
{
    int ioc_init_size;

    /* Allocate IOC INIT command */
    ioc_init_size = 1024 + sizeof(MPI2_IOC_INIT_REQUEST); 
    if (bus_dma_tag_create( sc->mrsas_parent_tag,   // parent
                            1, 0,                   // algnmnt, boundary
                            BUS_SPACE_MAXADDR_32BIT,// lowaddr
                            BUS_SPACE_MAXADDR,      // highaddr
                            NULL, NULL,             // filter, filterarg
                            ioc_init_size,          // maxsize
                            1,                      // msegments
                            ioc_init_size,          // maxsegsize
                            BUS_DMA_ALLOCNOW,       // flags
                            &sc->ioc_init_tag)) {
        device_printf(sc->mrsas_dev, "Cannot allocate ioc init tag\n");
        return (ENOMEM);
    }
    if (bus_dmamem_alloc(sc->ioc_init_tag, (void **)&sc->ioc_init_mem,
            BUS_DMA_NOWAIT, &sc->ioc_init_dmamap)) {
        device_printf(sc->mrsas_dev, "Cannot allocate ioc init cmd mem\n");
        return (ENOMEM);
    }
    bzero(sc->ioc_init_mem, ioc_init_size);
    if (bus_dmamap_load(sc->ioc_init_tag, sc->ioc_init_dmamap, 
            sc->ioc_init_mem, ioc_init_size, mrsas_addr_cb,
            &sc->ioc_init_phys_mem, BUS_DMA_NOWAIT)) {
        device_printf(sc->mrsas_dev, "Cannot load ioc init cmd mem\n");
        return (ENOMEM);
    }

    return (0);
}

/**
 * mrsas_free_ioc_cmd:   Allocates memory for IOC Init command 
 * input:                Adapter soft state
 *
 * Deallocates memory of the IOC Init cmd.
 */
void mrsas_free_ioc_cmd(struct mrsas_softc *sc)
{
    if (sc->ioc_init_phys_mem)
        bus_dmamap_unload(sc->ioc_init_tag, sc->ioc_init_dmamap);
    if (sc->ioc_init_mem != NULL)
        bus_dmamem_free(sc->ioc_init_tag, sc->ioc_init_mem, sc->ioc_init_dmamap);
    if (sc->ioc_init_tag != NULL)
        bus_dma_tag_destroy(sc->ioc_init_tag);
}

/**
 * mrsas_ioc_init:     Sends IOC Init command to FW
 * input:              Adapter soft state
 *
 * Issues the IOC Init cmd to FW to initialize the ROC/controller.
 */
int mrsas_ioc_init(struct mrsas_softc *sc)
{
    struct mrsas_init_frame *init_frame;
    pMpi2IOCInitRequest_t   IOCInitMsg;
    MRSAS_REQUEST_DESCRIPTOR_UNION req_desc;
    u_int8_t max_wait = MRSAS_IOC_INIT_WAIT_TIME;
    bus_addr_t phys_addr;
    int i, retcode = 0;

    /* Allocate memory for the IOC INIT command */
    if (mrsas_alloc_ioc_cmd(sc)) {
        device_printf(sc->mrsas_dev, "Cannot allocate IOC command.\n"); 
        return(1);
    }

    IOCInitMsg = (pMpi2IOCInitRequest_t)(((char *)sc->ioc_init_mem) +1024);
    IOCInitMsg->Function = MPI2_FUNCTION_IOC_INIT;
    IOCInitMsg->WhoInit = MPI2_WHOINIT_HOST_DRIVER;
    IOCInitMsg->MsgVersion = MPI2_VERSION;
    IOCInitMsg->HeaderVersion = MPI2_HEADER_VERSION;
    IOCInitMsg->SystemRequestFrameSize = MRSAS_MPI2_RAID_DEFAULT_IO_FRAME_SIZE / 4;
    IOCInitMsg->ReplyDescriptorPostQueueDepth = sc->reply_q_depth;
    IOCInitMsg->ReplyDescriptorPostQueueAddress = sc->reply_desc_phys_addr;
    IOCInitMsg->SystemRequestFrameBaseAddress = sc->io_request_phys_addr;

    init_frame = (struct mrsas_init_frame *)sc->ioc_init_mem;
    init_frame->cmd = MFI_CMD_INIT;
    init_frame->cmd_status = 0xFF;
    init_frame->flags |= MFI_FRAME_DONT_POST_IN_REPLY_QUEUE;

    if (sc->verbuf_mem) {
        ksnprintf((char *)sc->verbuf_mem, strlen(MRSAS_VERSION)+2,"%s\n",
                MRSAS_VERSION);
        init_frame->driver_ver_lo = (bus_addr_t)sc->verbuf_phys_addr;
        init_frame->driver_ver_hi = 0;
    }

    phys_addr = (bus_addr_t)sc->ioc_init_phys_mem + 1024;
    init_frame->queue_info_new_phys_addr_lo = phys_addr;
    init_frame->data_xfer_len = sizeof(Mpi2IOCInitRequest_t);

    req_desc.addr.Words = (bus_addr_t)sc->ioc_init_phys_mem;
    req_desc.MFAIo.RequestFlags = 
        (MRSAS_REQ_DESCRIPT_FLAGS_MFA << MRSAS_REQ_DESCRIPT_FLAGS_TYPE_SHIFT);

    mrsas_disable_intr(sc);
    mrsas_dprint(sc, MRSAS_OCR, "Issuing IOC INIT command to FW.\n");
    //device_printf(sc->mrsas_dev, "Issuing IOC INIT command to FW.\n");del?
    mrsas_fire_cmd(sc, req_desc.addr.u.low, req_desc.addr.u.high);

    /*
     * Poll response timer to wait for Firmware response.  While this
     * timer with the DELAY call could block CPU, the time interval for
     * this is only 1 millisecond.
     */
    if (init_frame->cmd_status == 0xFF) {
        for (i=0; i < (max_wait * 1000); i++){
            if (init_frame->cmd_status == 0xFF)
                DELAY(1000);
            else
                break;
        } 
    }

    if (init_frame->cmd_status == 0)
         mrsas_dprint(sc, MRSAS_OCR,
               "IOC INIT response received from FW.\n");
         //device_printf(sc->mrsas_dev, "IOC INIT response received from FW.\n");del?
    else 
    {
        if (init_frame->cmd_status == 0xFF) 
            device_printf(sc->mrsas_dev, "IOC Init timed out after %d seconds.\n", max_wait);
        else
            device_printf(sc->mrsas_dev, "IOC Init failed, status = 0x%x\n", init_frame->cmd_status);
        retcode = 1;
    }

    mrsas_free_ioc_cmd(sc);
    return (retcode);
}

/**
 * mrsas_alloc_mpt_cmds:  Allocates the command packets
 * input:                 Adapter instance soft state
 *
 * This function allocates the internal commands for IOs. Each command that is
 * issued to FW is wrapped in a local data structure called mrsas_mpt_cmd.
 * An array is allocated with mrsas_mpt_cmd context.  The free commands are 
 * maintained in a linked list (cmd pool). SMID value range is from 1 to
 * max_fw_cmds.
 */
int mrsas_alloc_mpt_cmds(struct mrsas_softc *sc)
{
    int i, j;
    u_int32_t max_cmd;
    struct mrsas_mpt_cmd *cmd;
    pMpi2ReplyDescriptorsUnion_t reply_desc;
    u_int32_t offset, chain_offset, sense_offset;
    bus_addr_t io_req_base_phys, chain_frame_base_phys, sense_base_phys;
    u_int8_t *io_req_base, *chain_frame_base, *sense_base;

    max_cmd = sc->max_fw_cmds;

    sc->req_desc = kmalloc(sc->request_alloc_sz, M_MRSAS, M_NOWAIT);
    if (!sc->req_desc) {
        device_printf(sc->mrsas_dev, "Out of memory, cannot alloc req desc\n");
        return(ENOMEM);
    }
    memset(sc->req_desc, 0, sc->request_alloc_sz);

    /*
     * sc->mpt_cmd_list is an array of struct mrsas_mpt_cmd pointers. Allocate the
     * dynamic array first and then allocate individual commands.
     */
    sc->mpt_cmd_list = kmalloc(sizeof(struct mrsas_mpt_cmd*)*max_cmd, M_MRSAS, M_NOWAIT);
    if (!sc->mpt_cmd_list) {
        device_printf(sc->mrsas_dev, "Cannot alloc memory for mpt_cmd_list.\n");
        return(ENOMEM);
    }
    memset(sc->mpt_cmd_list, 0, sizeof(struct mrsas_mpt_cmd *)*max_cmd);
    for (i = 0; i < max_cmd; i++) {
        sc->mpt_cmd_list[i] = kmalloc(sizeof(struct mrsas_mpt_cmd), 
                                 M_MRSAS, M_NOWAIT);
        if (!sc->mpt_cmd_list[i]) {
            for (j = 0; j < i; j++)
                kfree(sc->mpt_cmd_list[j],M_MRSAS);
            kfree(sc->mpt_cmd_list, M_MRSAS);
            sc->mpt_cmd_list = NULL;
            return(ENOMEM);
        }
    }

    io_req_base = (u_int8_t*)sc->io_request_mem + MRSAS_MPI2_RAID_DEFAULT_IO_FRAME_SIZE;
    io_req_base_phys = (bus_addr_t)sc->io_request_phys_addr + MRSAS_MPI2_RAID_DEFAULT_IO_FRAME_SIZE; 
    chain_frame_base = (u_int8_t*)sc->chain_frame_mem;
    chain_frame_base_phys = (bus_addr_t)sc->chain_frame_phys_addr;
    sense_base = (u_int8_t*)sc->sense_mem;
    sense_base_phys = (bus_addr_t)sc->sense_phys_addr;
    for (i = 0; i < max_cmd; i++) {
        cmd = sc->mpt_cmd_list[i];
        offset = MRSAS_MPI2_RAID_DEFAULT_IO_FRAME_SIZE * i;
	chain_offset = 1024 * i;
        sense_offset = MRSAS_SENSE_LEN * i;
        memset(cmd, 0, sizeof(struct mrsas_mpt_cmd));
        cmd->index = i + 1;
        cmd->ccb_ptr = NULL;
        callout_init(&cmd->cm_callout);
        cmd->sync_cmd_idx = (u_int32_t)MRSAS_ULONG_MAX;
        cmd->sc = sc; 
        cmd->io_request = (MRSAS_RAID_SCSI_IO_REQUEST *) (io_req_base + offset);
        memset(cmd->io_request, 0, sizeof(MRSAS_RAID_SCSI_IO_REQUEST));
        cmd->io_request_phys_addr = io_req_base_phys + offset;
	cmd->chain_frame = (MPI2_SGE_IO_UNION *) (chain_frame_base + chain_offset);
	cmd->chain_frame_phys_addr = chain_frame_base_phys + chain_offset;
        cmd->sense = sense_base + sense_offset;
        cmd->sense_phys_addr = sense_base_phys + sense_offset;
        if (bus_dmamap_create(sc->data_tag, 0, &cmd->data_dmamap)) {
            return(FAIL);
        }
        TAILQ_INSERT_TAIL(&(sc->mrsas_mpt_cmd_list_head), cmd, next);
    }
    
    /* Initialize reply descriptor array to 0xFFFFFFFF */
    reply_desc = sc->reply_desc_mem;
    for (i = 0; i < sc->reply_q_depth; i++, reply_desc++) {
        reply_desc->Words = MRSAS_ULONG_MAX;
    }
    return(0);
}

/**
 * mrsas_fire_cmd:     Sends command to FW
 * input:              Adapter soft state
 *                     request descriptor address low
 *                     request descriptor address high
 *
 * This functions fires the command to Firmware by writing to the 
 * inbound_low_queue_port and inbound_high_queue_port.
 */
void mrsas_fire_cmd(struct mrsas_softc *sc, u_int32_t req_desc_lo, 
                   u_int32_t req_desc_hi)
{ 
    lockmgr(&sc->pci_lock, LK_EXCLUSIVE);
    mrsas_write_reg(sc, offsetof(mrsas_reg_set, inbound_low_queue_port), 
                    req_desc_lo); 
    mrsas_write_reg(sc, offsetof(mrsas_reg_set, inbound_high_queue_port), 
                    req_desc_hi); 
    lockmgr(&sc->pci_lock, LK_RELEASE);
}

/**
 * mrsas_transition_to_ready:  Move FW to Ready state 
 * input:                      Adapter instance soft state
 *
 * During the initialization, FW passes can potentially be in any one of
 * several possible states. If the FW in operational, waiting-for-handshake
 * states, driver must take steps to bring it to ready state. Otherwise, it
 * has to wait for the ready state.
 */
int mrsas_transition_to_ready(struct mrsas_softc *sc, int ocr)
{
    int i;
    u_int8_t max_wait;
    u_int32_t val, fw_state;
    u_int32_t cur_state;
    u_int32_t abs_state, curr_abs_state;

    val = mrsas_read_reg(sc, offsetof(mrsas_reg_set, outbound_scratch_pad));
    fw_state = val & MFI_STATE_MASK;
    max_wait = MRSAS_RESET_WAIT_TIME;

    if (fw_state != MFI_STATE_READY)
        device_printf(sc->mrsas_dev, "Waiting for FW to come to ready state\n");

    while (fw_state != MFI_STATE_READY) {
	abs_state = mrsas_read_reg(sc, offsetof(mrsas_reg_set, outbound_scratch_pad));
	switch (fw_state) {
	    case MFI_STATE_FAULT:
		device_printf(sc->mrsas_dev, "FW is in FAULT state!!\n");
		if (ocr) {
		    cur_state = MFI_STATE_FAULT;
	  	    break;
		} 
        else
			return -ENODEV;
	    case MFI_STATE_WAIT_HANDSHAKE:
		/* Set the CLR bit in inbound doorbell */
                mrsas_write_reg(sc, offsetof(mrsas_reg_set, doorbell),
		        MFI_INIT_CLEAR_HANDSHAKE|MFI_INIT_HOTPLUG);
		cur_state = MFI_STATE_WAIT_HANDSHAKE;
		break;
	    case MFI_STATE_BOOT_MESSAGE_PENDING:
                mrsas_write_reg(sc, offsetof(mrsas_reg_set, doorbell),
		        MFI_INIT_HOTPLUG);
		cur_state = MFI_STATE_BOOT_MESSAGE_PENDING;
		break;
	    case MFI_STATE_OPERATIONAL:
		/* Bring it to READY state; assuming max wait 10 secs */
		mrsas_disable_intr(sc);
                mrsas_write_reg(sc, offsetof(mrsas_reg_set, doorbell), MFI_RESET_FLAGS);
                for (i=0; i < max_wait * 1000; i++) {
	            if (mrsas_read_reg(sc, offsetof(mrsas_reg_set, doorbell)) & 1)
                        DELAY(1000);
		    else
		        break;
                }
		cur_state = MFI_STATE_OPERATIONAL;
	        break;
	    case MFI_STATE_UNDEFINED:
	        /* This state should not last for more than 2 seconds */
	        cur_state = MFI_STATE_UNDEFINED;
	        break;
	    case MFI_STATE_BB_INIT:
		cur_state = MFI_STATE_BB_INIT;
		break;
	    case MFI_STATE_FW_INIT:
		cur_state = MFI_STATE_FW_INIT;
		break;
	    case MFI_STATE_FW_INIT_2:
		cur_state = MFI_STATE_FW_INIT_2;
		break;
	    case MFI_STATE_DEVICE_SCAN:
		cur_state = MFI_STATE_DEVICE_SCAN;
		break;
	    case MFI_STATE_FLUSH_CACHE:
		cur_state = MFI_STATE_FLUSH_CACHE;
		break;
	    default:
		device_printf(sc->mrsas_dev, "Unknown state 0x%x\n", fw_state);
		return -ENODEV;
	}

	/*
	 * The cur_state should not last for more than max_wait secs
	 */
	for (i = 0; i < (max_wait * 1000); i++) {
            fw_state = (mrsas_read_reg(sc, offsetof(mrsas_reg_set, 
                    outbound_scratch_pad))& MFI_STATE_MASK);
	    curr_abs_state = mrsas_read_reg(sc, offsetof(mrsas_reg_set,
                    outbound_scratch_pad));
            if (abs_state == curr_abs_state)
                DELAY(1000);
	    else
		break;
	}

	/*
	 * Return error if fw_state hasn't changed after max_wait
	 */
	if (curr_abs_state == abs_state) {
            device_printf(sc->mrsas_dev, "FW state [%d] hasn't changed "
		       "in %d secs\n", fw_state, max_wait);
	    return -ENODEV;
	}
    }
    mrsas_dprint(sc, MRSAS_OCR, "FW now in Ready state\n");
    //device_printf(sc->mrsas_dev, "FW now in Ready state\n");del?
    return 0;
}

/**
 * mrsas_get_mfi_cmd:      Get a cmd from free command pool
 * input:                  Adapter soft state
 *
 * This function removes an MFI command from the command list.
 */
struct mrsas_mfi_cmd* mrsas_get_mfi_cmd(struct mrsas_softc *sc)
{
    struct mrsas_mfi_cmd *cmd = NULL;
        
    lockmgr(&sc->mfi_cmd_pool_lock, LK_EXCLUSIVE);
    if (!TAILQ_EMPTY(&sc->mrsas_mfi_cmd_list_head)){
        cmd = TAILQ_FIRST(&sc->mrsas_mfi_cmd_list_head);
        TAILQ_REMOVE(&sc->mrsas_mfi_cmd_list_head, cmd, next);
    }
    lockmgr(&sc->mfi_cmd_pool_lock, LK_RELEASE);
    
    return cmd;
}

/**
 * mrsas_ocr_thread             Thread to handle OCR/Kill Adapter.
 * input:               Adapter Context.
 *
 * This function will check FW status register and flag
 * do_timeout_reset flag. It will do OCR/Kill adapter if
 * FW is in fault state or IO timed out has trigger reset.
 */
static void
mrsas_ocr_thread(void *arg)
{
    struct mrsas_softc *sc;
    u_int32_t  fw_status, fw_state;
                      
    sc = (struct mrsas_softc *)arg;

    mrsas_dprint(sc, MRSAS_TRACE, "%s\n", __func__);
         
    sc->ocr_thread_active = 1;
    lockmgr(&sc->sim_lock, LK_EXCLUSIVE);
    for (;;) {
        /* Sleep for 1 second and check the queue status*/
	lksleep(&sc->ocr_chan, &sc->sim_lock, 0,
               "mrsas_ocr", sc->mrsas_fw_fault_check_delay * hz);
        if (sc->remove_in_progress) {
            mrsas_dprint(sc, MRSAS_OCR, 
				"Exit due to shutdown from %s\n", __func__);
            break;
        }
        fw_status = mrsas_read_reg(sc, 
				offsetof(mrsas_reg_set, outbound_scratch_pad));
        fw_state = fw_status & MFI_STATE_MASK;
        if (fw_state == MFI_STATE_FAULT || sc->do_timedout_reset) {
            device_printf(sc->mrsas_dev, "OCR started due to %s!\n",
                 sc->do_timedout_reset?"IO Timeout":
                 "FW fault detected");
            spin_lock(&sc->ioctl_lock);
            sc->reset_in_progress = 1;
            sc->reset_count++;
            spin_unlock(&sc->ioctl_lock);
            mrsas_xpt_freeze(sc);
            mrsas_reset_ctrl(sc);
            mrsas_xpt_release(sc);
            sc->reset_in_progress = 0;
            sc->do_timedout_reset = 0;
        }
    }
    lockmgr(&sc->sim_lock, LK_RELEASE);
    sc->ocr_thread_active = 0;
    kthread_exit();
}

/**
 * mrsas_reset_reply_desc       Reset Reply descriptor as part of OCR.
 * input:                       Adapter Context.
 *
 * This function will clear reply descriptor so that post OCR
 * driver and FW will lost old history.
 */
void  mrsas_reset_reply_desc(struct mrsas_softc *sc)
{
    int i;
    pMpi2ReplyDescriptorsUnion_t reply_desc;

    sc->last_reply_idx = 0;
    reply_desc = sc->reply_desc_mem;
    for (i = 0; i < sc->reply_q_depth; i++, reply_desc++) {
        reply_desc->Words = MRSAS_ULONG_MAX;
    }
}

/**
 * mrsas_reset_ctrl     Core function to OCR/Kill adapter.
 * input:               Adapter Context.
 *
 * This function will run from thread context so that it can sleep.
 * 1. Do not handle OCR if FW is in HW critical error.
 * 2. Wait for outstanding command to complete for 180 seconds.
 * 3. If #2 does not find any outstanding command Controller is in working
 * state, so skip OCR.
 * Otherwise, do OCR/kill Adapter based on flag disableOnlineCtrlReset.
 * 4. Start of the OCR, return all SCSI command back to CAM layer which has
 * ccb_ptr.
 * 5. Post OCR, Re-fire Managment command and move Controller to Operation
 * state.
 */
int mrsas_reset_ctrl(struct mrsas_softc *sc)
{
    int retval = SUCCESS, i, j, retry = 0;
    u_int32_t       host_diag, abs_state, status_reg, reset_adapter;
    union ccb   *ccb;
    struct mrsas_mfi_cmd *mfi_cmd;
    struct mrsas_mpt_cmd *mpt_cmd;
    MRSAS_REQUEST_DESCRIPTOR_UNION *req_desc;

    if (sc->adprecovery == MRSAS_HW_CRITICAL_ERROR) {
        device_printf(sc->mrsas_dev,
                        "mrsas: Hardware critical error, returning FAIL.\n");
        return FAIL;
    }

    set_bit(MRSAS_FUSION_IN_RESET, &sc->reset_flags);
    sc->adprecovery = MRSAS_ADPRESET_SM_INFAULT;
    mrsas_disable_intr(sc);
    DELAY(1000 * 1000);

    /* First try waiting for commands to complete */
    if (mrsas_wait_for_outstanding(sc)) {
        mrsas_dprint(sc, MRSAS_OCR,
                     "resetting adapter from %s.\n",
                      __func__);
        /* Now return commands back to the CAM layer */
        for (i = 0 ; i < sc->max_fw_cmds; i++) {
            mpt_cmd = sc->mpt_cmd_list[i];
            if (mpt_cmd->ccb_ptr) {
                ccb = (union ccb *)(mpt_cmd->ccb_ptr);
                ccb->ccb_h.status = CAM_SCSI_BUS_RESET;
                mrsas_cmd_done(sc, mpt_cmd);
                atomic_dec(&sc->fw_outstanding);
            }
        }
   
        status_reg = mrsas_read_reg(sc, offsetof(mrsas_reg_set,
                                                           outbound_scratch_pad));
        abs_state = status_reg & MFI_STATE_MASK;
        reset_adapter = status_reg & MFI_RESET_ADAPTER;
        if (sc->disableOnlineCtrlReset ||
                        (abs_state == MFI_STATE_FAULT && !reset_adapter)) {
            /* Reset not supported, kill adapter */
            mrsas_dprint(sc, MRSAS_OCR,"Reset not supported, killing adapter.\n");
            mrsas_kill_hba(sc);
            sc->adprecovery = MRSAS_HW_CRITICAL_ERROR;
            retval = FAIL;
             goto out;
        }

        /* Now try to reset the chip */
        for (i = 0; i < MRSAS_FUSION_MAX_RESET_TRIES; i++) {
            mrsas_write_reg(sc, offsetof(mrsas_reg_set, fusion_seq_offset),
                MPI2_WRSEQ_FLUSH_KEY_VALUE);
            mrsas_write_reg(sc, offsetof(mrsas_reg_set, fusion_seq_offset),
                MPI2_WRSEQ_1ST_KEY_VALUE);
            mrsas_write_reg(sc, offsetof(mrsas_reg_set, fusion_seq_offset),
                MPI2_WRSEQ_2ND_KEY_VALUE);
            mrsas_write_reg(sc, offsetof(mrsas_reg_set, fusion_seq_offset),
                MPI2_WRSEQ_3RD_KEY_VALUE);
            mrsas_write_reg(sc, offsetof(mrsas_reg_set, fusion_seq_offset),
                MPI2_WRSEQ_4TH_KEY_VALUE);
            mrsas_write_reg(sc, offsetof(mrsas_reg_set, fusion_seq_offset),
                MPI2_WRSEQ_5TH_KEY_VALUE);
            mrsas_write_reg(sc, offsetof(mrsas_reg_set, fusion_seq_offset),
                MPI2_WRSEQ_6TH_KEY_VALUE);

            /* Check that the diag write enable (DRWE) bit is on */
            host_diag = mrsas_read_reg(sc, offsetof(mrsas_reg_set,
                                                        fusion_host_diag));
            retry = 0;
            while (!(host_diag & HOST_DIAG_WRITE_ENABLE)) {
                DELAY(100 * 1000);
                host_diag = mrsas_read_reg(sc, offsetof(mrsas_reg_set,
                                                        fusion_host_diag));
                if (retry++ == 100) {
                    mrsas_dprint(sc, MRSAS_OCR,
                    "Host diag unlock failed!\n");
                    break;
                }
            }
            if (!(host_diag & HOST_DIAG_WRITE_ENABLE))
                continue;

            /* Send chip reset command */
            mrsas_write_reg(sc, offsetof(mrsas_reg_set, fusion_host_diag),
               host_diag | HOST_DIAG_RESET_ADAPTER);
            DELAY(3000 * 1000);

            /* Make sure reset adapter bit is cleared */
            host_diag = mrsas_read_reg(sc, offsetof(mrsas_reg_set,
                                                        fusion_host_diag));
            retry = 0;
            while (host_diag & HOST_DIAG_RESET_ADAPTER) {
                DELAY(100 * 1000);
                host_diag = mrsas_read_reg(sc, offsetof(mrsas_reg_set,
                                                        fusion_host_diag));
                if (retry++ == 1000) {
                    mrsas_dprint(sc, MRSAS_OCR,
                                        "Diag reset adapter never cleared!\n");
                    break;
                }
            }
            if (host_diag & HOST_DIAG_RESET_ADAPTER)
                continue;

            abs_state = mrsas_read_reg(sc, offsetof(mrsas_reg_set,
                                    outbound_scratch_pad)) & MFI_STATE_MASK;
            retry = 0;

            while ((abs_state <= MFI_STATE_FW_INIT) && (retry++ < 1000)) {
                DELAY(100 * 1000);
                abs_state = mrsas_read_reg(sc, offsetof(mrsas_reg_set,
                                     outbound_scratch_pad)) & MFI_STATE_MASK;
            }
            if (abs_state <= MFI_STATE_FW_INIT) {
                mrsas_dprint(sc, MRSAS_OCR, "firmware state < MFI_STATE_FW_INIT,"
                                " state = 0x%x\n", abs_state);
                continue;
            }

            /* Wait for FW to become ready */
            if (mrsas_transition_to_ready(sc, 1)) {
                mrsas_dprint(sc, MRSAS_OCR,
                           "mrsas: Failed to transition controller to ready.\n");
                continue;
            }

            mrsas_reset_reply_desc(sc);
            if (mrsas_ioc_init(sc)) {
                mrsas_dprint(sc, MRSAS_OCR, "mrsas_ioc_init() failed!\n");
                continue;
            }

            clear_bit(MRSAS_FUSION_IN_RESET, &sc->reset_flags);
            mrsas_enable_intr(sc);
            sc->adprecovery = MRSAS_HBA_OPERATIONAL;

            /* Re-fire management commands */
            for (j = 0 ; j < sc->max_fw_cmds; j++) {
                mpt_cmd = sc->mpt_cmd_list[j];
                if (mpt_cmd->sync_cmd_idx != (u_int32_t)MRSAS_ULONG_MAX) {
                    mfi_cmd = sc->mfi_cmd_list[mpt_cmd->sync_cmd_idx];
                    if (mfi_cmd->frame->dcmd.opcode ==
                                          MR_DCMD_LD_MAP_GET_INFO) {
                        mrsas_release_mfi_cmd(mfi_cmd);
                        mrsas_release_mpt_cmd(mpt_cmd);
                    } else  {
                        req_desc = mrsas_get_request_desc(sc,
                            mfi_cmd->cmd_id.context.smid - 1);
                        mrsas_dprint(sc, MRSAS_OCR,
                            "Re-fire command DCMD opcode 0x%x index %d\n ",
                             mfi_cmd->frame->dcmd.opcode, j);
                        if (!req_desc)
                            device_printf(sc->mrsas_dev, 
                                          "Cannot build MPT cmd.\n");
                        else
                            mrsas_fire_cmd(sc, req_desc->addr.u.low,
                                                     req_desc->addr.u.high);
                    }
                }
            }

            /* Reset load balance info */
            memset(sc->load_balance_info, 0, 
                   sizeof(LD_LOAD_BALANCE_INFO) * MAX_LOGICAL_DRIVES); 

            if (!mrsas_get_map_info(sc))
                mrsas_sync_map_info(sc);

            /* Adapter reset completed successfully */
            device_printf(sc->mrsas_dev, "Reset successful\n");
            retval = SUCCESS;
            goto out;
        }
        /* Reset failed, kill the adapter */
        device_printf(sc->mrsas_dev, "Reset failed, killing adapter.\n");
        mrsas_kill_hba(sc);
        retval = FAIL;
    } else {
        clear_bit(MRSAS_FUSION_IN_RESET, &sc->reset_flags);
        mrsas_enable_intr(sc);
        sc->adprecovery = MRSAS_HBA_OPERATIONAL;
    }
out:
    clear_bit(MRSAS_FUSION_IN_RESET, &sc->reset_flags);
    mrsas_dprint(sc, MRSAS_OCR,
            "Reset Exit with %d.\n", retval);
    return retval;
}

/**
 * mrsas_kill_hba       Kill HBA when OCR is not supported.
 * input:               Adapter Context.
 *
 * This function will kill HBA when OCR is not supported.
 */
void mrsas_kill_hba (struct mrsas_softc *sc)
{
    mrsas_dprint(sc, MRSAS_OCR, "%s\n", __func__);
    mrsas_write_reg(sc, offsetof(mrsas_reg_set, doorbell),
                        MFI_STOP_ADP);
    /* Flush */
    mrsas_read_reg(sc, offsetof(mrsas_reg_set, doorbell));
}

/**
 * mrsas_wait_for_outstanding           Wait for outstanding commands
 * input:                               Adapter Context.
 *
 * This function will wait for 180 seconds for outstanding
 * commands to be completed.
 */
int mrsas_wait_for_outstanding(struct mrsas_softc *sc)
{
    int i, outstanding, retval = 0;
    u_int32_t fw_state;

    for (i = 0; i < MRSAS_RESET_WAIT_TIME; i++) {
        if (sc->remove_in_progress) {
            mrsas_dprint(sc, MRSAS_OCR,
                "Driver remove or shutdown called.\n");
            retval = 1;
            goto out;
        }
        /* Check if firmware is in fault state */
        fw_state = mrsas_read_reg(sc, offsetof(mrsas_reg_set,
                                  outbound_scratch_pad)) & MFI_STATE_MASK;
        if (fw_state == MFI_STATE_FAULT) {
            mrsas_dprint(sc, MRSAS_OCR,
                         "Found FW in FAULT state, will reset adapter.\n");
            retval = 1;
            goto out;
        }
        outstanding = atomic_read(&sc->fw_outstanding);
        if (!outstanding)
            goto out;

        if (!(i % MRSAS_RESET_NOTICE_INTERVAL)) {
            mrsas_dprint(sc, MRSAS_OCR, "[%2d]waiting for %d "
                                "commands to complete\n",i,outstanding);
            mrsas_complete_cmd(sc);
        }
        DELAY(1000 * 1000);
    }

    if (atomic_read(&sc->fw_outstanding)) {
        mrsas_dprint(sc, MRSAS_OCR,
                        " pending commands remain after waiting,"
                        " will reset adapter.\n");
        retval = 1;
    }
out:
    return retval;
}

/**
 * mrsas_release_mfi_cmd: Return a cmd to free command pool
 * input:                 Command packet for return to free cmd pool 
 *
 * This function returns the MFI command to the command list.
 */
void mrsas_release_mfi_cmd(struct mrsas_mfi_cmd *cmd)
{
    struct mrsas_softc *sc = cmd->sc;

    lockmgr(&sc->mfi_cmd_pool_lock, LK_EXCLUSIVE);
    cmd->ccb_ptr = NULL;
	cmd->cmd_id.frame_count = 0;
    TAILQ_INSERT_TAIL(&(sc->mrsas_mfi_cmd_list_head), cmd, next);
    lockmgr(&sc->mfi_cmd_pool_lock, LK_RELEASE);

    return;
}

/**
 * mrsas_get_controller_info -        Returns FW's controller structure
 * input:                             Adapter soft state
 *                                    Controller information structure
 *
 * Issues an internal command (DCMD) to get the FW's controller structure.
 * This information is mainly used to find out the maximum IO transfer per
 * command supported by the FW.
 */
static int mrsas_get_ctrl_info(struct mrsas_softc *sc, 
                      struct mrsas_ctrl_info *ctrl_info)
{
    int retcode = 0;
    struct mrsas_mfi_cmd *cmd;
    struct mrsas_dcmd_frame *dcmd;

    cmd = mrsas_get_mfi_cmd(sc);

    if (!cmd) {
        device_printf(sc->mrsas_dev, "Failed to get a free cmd\n");
        return -ENOMEM;
    }
    dcmd = &cmd->frame->dcmd;

    if (mrsas_alloc_ctlr_info_cmd(sc) != SUCCESS) {
        device_printf(sc->mrsas_dev, "Cannot allocate get ctlr info cmd\n");
        mrsas_release_mfi_cmd(cmd);
        return -ENOMEM;
    }
    memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);

    dcmd->cmd = MFI_CMD_DCMD;
    dcmd->cmd_status = 0xFF;
    dcmd->sge_count = 1;
    dcmd->flags = MFI_FRAME_DIR_READ;
    dcmd->timeout = 0;
    dcmd->pad_0 = 0;
    dcmd->data_xfer_len = sizeof(struct mrsas_ctrl_info);
    dcmd->opcode = MR_DCMD_CTRL_GET_INFO;
    dcmd->sgl.sge32[0].phys_addr = sc->ctlr_info_phys_addr;
    dcmd->sgl.sge32[0].length = sizeof(struct mrsas_ctrl_info);

    if (!mrsas_issue_polled(sc, cmd)) 
        memcpy(ctrl_info, sc->ctlr_info_mem, sizeof(struct mrsas_ctrl_info));
    else 
        retcode = 1;

    mrsas_free_ctlr_info_cmd(sc);
    mrsas_release_mfi_cmd(cmd);
    return(retcode);
}

/**
 * mrsas_alloc_ctlr_info_cmd:  Allocates memory for controller info command
 * input:                      Adapter soft state
 *
 * Allocates DMAable memory for the controller info internal command.
 */
int mrsas_alloc_ctlr_info_cmd(struct mrsas_softc *sc)
{
    int ctlr_info_size;

    /* Allocate get controller info command */
    ctlr_info_size = sizeof(struct mrsas_ctrl_info);
    if (bus_dma_tag_create( sc->mrsas_parent_tag,   // parent
                            1, 0,                   // algnmnt, boundary
                            BUS_SPACE_MAXADDR_32BIT,// lowaddr
                            BUS_SPACE_MAXADDR,      // highaddr
                            NULL, NULL,             // filter, filterarg
                            ctlr_info_size,          // maxsize
                            1,                      // msegments
                            ctlr_info_size,          // maxsegsize
                            BUS_DMA_ALLOCNOW,       // flags
                            &sc->ctlr_info_tag)) {
        device_printf(sc->mrsas_dev, "Cannot allocate ctlr info tag\n");
        return (ENOMEM);
    }
    if (bus_dmamem_alloc(sc->ctlr_info_tag, (void **)&sc->ctlr_info_mem,
            BUS_DMA_NOWAIT, &sc->ctlr_info_dmamap)) {
        device_printf(sc->mrsas_dev, "Cannot allocate ctlr info cmd mem\n");
        return (ENOMEM);
    }
    if (bus_dmamap_load(sc->ctlr_info_tag, sc->ctlr_info_dmamap,
            sc->ctlr_info_mem, ctlr_info_size, mrsas_addr_cb,
            &sc->ctlr_info_phys_addr, BUS_DMA_NOWAIT)) {
        device_printf(sc->mrsas_dev, "Cannot load ctlr info cmd mem\n");
        return (ENOMEM);
    }

    memset(sc->ctlr_info_mem, 0, ctlr_info_size);
    return (0);
}

/**
 * mrsas_free_ctlr_info_cmd: Free memory for controller info command 
 * input:                    Adapter soft state
 *
 * Deallocates memory of the get controller info cmd.
 */
void mrsas_free_ctlr_info_cmd(struct mrsas_softc *sc)
{
    if (sc->ctlr_info_phys_addr)
        bus_dmamap_unload(sc->ctlr_info_tag, sc->ctlr_info_dmamap);
    if (sc->ctlr_info_mem != NULL)
        bus_dmamem_free(sc->ctlr_info_tag, sc->ctlr_info_mem, sc->ctlr_info_dmamap);
    if (sc->ctlr_info_tag != NULL)
        bus_dma_tag_destroy(sc->ctlr_info_tag);
}

/**
 * mrsas_issue_polled:        Issues a polling command
 * inputs:                    Adapter soft state
 *                            Command packet to be issued
 *
 * This function is for posting of internal commands to Firmware.  MFI 
 * requires the cmd_status to be set to 0xFF before posting.  The maximun
 * wait time of the poll response timer is 180 seconds.
 */
int mrsas_issue_polled(struct mrsas_softc *sc, struct mrsas_mfi_cmd *cmd)
{
    struct mrsas_header *frame_hdr = &cmd->frame->hdr;
    u_int8_t max_wait = MRSAS_INTERNAL_CMD_WAIT_TIME;
    int i, retcode = 0;

    frame_hdr->cmd_status = 0xFF;
    frame_hdr->flags |= MFI_FRAME_DONT_POST_IN_REPLY_QUEUE;

    /* Issue the frame using inbound queue port */
    if (mrsas_issue_dcmd(sc, cmd)) {
        device_printf(sc->mrsas_dev, "Cannot issue DCMD internal command.\n");
        return(1);
    }

    /* 
     * Poll response timer to wait for Firmware response.  While this   
     * timer with the DELAY call could block CPU, the time interval for 
     * this is only 1 millisecond. 
     */
    if (frame_hdr->cmd_status == 0xFF) {
        for (i=0; i < (max_wait * 1000); i++){
            if (frame_hdr->cmd_status == 0xFF)
                DELAY(1000);
            else
                break;
        } 
    }
    if (frame_hdr->cmd_status != 0)
    {
        if (frame_hdr->cmd_status == 0xFF)
            device_printf(sc->mrsas_dev, "DCMD timed out after %d seconds.\n", max_wait); 
        else
            device_printf(sc->mrsas_dev, "DCMD failed, status = 0x%x\n", frame_hdr->cmd_status);
        retcode = 1;
    }
    return(retcode);
}

/**
 * mrsas_issue_dcmd -     Issues a MFI Pass thru cmd
 * input:                 Adapter soft state
 *                        mfi cmd pointer
 *
 * This function is called by mrsas_issued_blocked_cmd() and
 * mrsas_issued_polled(), to build the MPT command and then fire the 
 * command to Firmware. 
 */
int
mrsas_issue_dcmd(struct mrsas_softc *sc, struct mrsas_mfi_cmd *cmd)
{
    MRSAS_REQUEST_DESCRIPTOR_UNION *req_desc;

    req_desc = mrsas_build_mpt_cmd(sc, cmd);
    if (!req_desc) {
        device_printf(sc->mrsas_dev, "Cannot build MPT cmd.\n");
        return(1);
    }

    mrsas_fire_cmd(sc, req_desc->addr.u.low, req_desc->addr.u.high);

    return(0);
}

/**
 * mrsas_build_mpt_cmd - Calls helper function to build Passthru cmd
 * input:                Adapter soft state
 *                       mfi cmd to build
 *
 * This function is called by mrsas_issue_cmd() to build the MPT-MFI
 * passthru command and prepares the MPT command to send to Firmware.
 */
MRSAS_REQUEST_DESCRIPTOR_UNION *
mrsas_build_mpt_cmd(struct mrsas_softc *sc, struct mrsas_mfi_cmd *cmd)
{
    MRSAS_REQUEST_DESCRIPTOR_UNION *req_desc;
    u_int16_t index;

    if (mrsas_build_mptmfi_passthru(sc, cmd)) {
        device_printf(sc->mrsas_dev, "Cannot build MPT-MFI passthru cmd.\n");
        return NULL;
    }

    index = cmd->cmd_id.context.smid;

    req_desc = mrsas_get_request_desc(sc, index-1);
    if(!req_desc)
        return NULL;

    req_desc->addr.Words = 0;
    req_desc->SCSIIO.RequestFlags = (MPI2_REQ_DESCRIPT_FLAGS_SCSI_IO << MRSAS_REQ_DESCRIPT_FLAGS_TYPE_SHIFT);

    req_desc->SCSIIO.SMID = index;

    return(req_desc);
}

/**
 * mrsas_build_mptmfi_passthru - Builds a MPT MFI Passthru command 
 * input:                        Adapter soft state
 *                               mfi cmd pointer 
 *
 * The MPT command and the io_request are setup as a passthru command. 
 * The SGE chain address is set to frame_phys_addr of the MFI command. 
 */
u_int8_t
mrsas_build_mptmfi_passthru(struct mrsas_softc *sc, struct mrsas_mfi_cmd *mfi_cmd)
{
    MPI25_IEEE_SGE_CHAIN64 *mpi25_ieee_chain;
    PTR_MRSAS_RAID_SCSI_IO_REQUEST io_req;
    struct mrsas_mpt_cmd *mpt_cmd;
    struct mrsas_header *frame_hdr = &mfi_cmd->frame->hdr;

    mpt_cmd = mrsas_get_mpt_cmd(sc);
    if (!mpt_cmd)
        return(1);

    /* Save the smid. To be used for returning the cmd */
    mfi_cmd->cmd_id.context.smid = mpt_cmd->index;

    mpt_cmd->sync_cmd_idx = mfi_cmd->index;

    /*
     * For cmds where the flag is set, store the flag and check
     * on completion. For cmds with this flag, don't call
     * mrsas_complete_cmd.
     */

    if (frame_hdr->flags & MFI_FRAME_DONT_POST_IN_REPLY_QUEUE)
        mpt_cmd->flags = MFI_FRAME_DONT_POST_IN_REPLY_QUEUE;

    io_req = mpt_cmd->io_request;

    if ((sc->device_id == MRSAS_INVADER) || (sc->device_id == MRSAS_FURY)) {
		pMpi25IeeeSgeChain64_t sgl_ptr_end = (pMpi25IeeeSgeChain64_t) &io_req->SGL;
                sgl_ptr_end += sc->max_sge_in_main_msg - 1;
                sgl_ptr_end->Flags = 0;
    }

    mpi25_ieee_chain = (MPI25_IEEE_SGE_CHAIN64 *)&io_req->SGL.IeeeChain;

    io_req->Function    = MRSAS_MPI2_FUNCTION_PASSTHRU_IO_REQUEST;
    io_req->SGLOffset0  = offsetof(MRSAS_RAID_SCSI_IO_REQUEST, SGL) / 4;
    io_req->ChainOffset = sc->chain_offset_mfi_pthru;

    mpi25_ieee_chain->Address = mfi_cmd->frame_phys_addr;

    mpi25_ieee_chain->Flags= IEEE_SGE_FLAGS_CHAIN_ELEMENT |
              MPI2_IEEE_SGE_FLAGS_IOCPLBNTA_ADDR;

    mpi25_ieee_chain->Length = MRSAS_MAX_SZ_CHAIN_FRAME;

    return(0);
}

/**
 * mrsas_issue_blocked_cmd - Synchronous wrapper around regular FW cmds
 * input:                    Adapter soft state
 *                           Command to be issued
 *
 * This function waits on an event for the command to be returned 
 * from the ISR. Max wait time is MRSAS_INTERNAL_CMD_WAIT_TIME secs.
 * Used for issuing internal and ioctl commands.
 */
int mrsas_issue_blocked_cmd(struct mrsas_softc *sc, struct mrsas_mfi_cmd *cmd)
{
    u_int8_t max_wait = MRSAS_INTERNAL_CMD_WAIT_TIME;
    unsigned long total_time = 0;
    int retcode = 0;

    /* Initialize cmd_status */
    cmd->cmd_status = ECONNREFUSED;

    /* Build MPT-MFI command for issue to FW */
    if (mrsas_issue_dcmd(sc, cmd)){
        device_printf(sc->mrsas_dev, "Cannot issue DCMD internal command.\n");
        return(1);
    }

    sc->chan = (void*)&cmd;

    /* The following is for debug only... */
    //device_printf(sc->mrsas_dev,"DCMD issued to FW, about to sleep-wait...\n");
    //device_printf(sc->mrsas_dev,"sc->chan = %p\n", sc->chan);

    while (1) {
       if (cmd->cmd_status == ECONNREFUSED){
           tsleep((void *)&sc->chan, 0, "mrsas_sleep", hz);
       }
       else
           break;
       total_time++;
       if (total_time >= max_wait) {
           device_printf(sc->mrsas_dev, "Internal command timed out after %d seconds.\n", max_wait);
           retcode = 1;
           break;
       } 
    } 
    return(retcode);
}

/**
 * mrsas_complete_mptmfi_passthru - Completes a command
 * input:                           sc: Adapter soft state
 *                                  cmd: Command to be completed
 *                                  status: cmd completion status 
 *
 * This function is called from mrsas_complete_cmd() after an interrupt 
 * is received from Firmware, and io_request->Function is 
 * MRSAS_MPI2_FUNCTION_PASSTHRU_IO_REQUEST.
 */
void
mrsas_complete_mptmfi_passthru(struct mrsas_softc *sc, struct mrsas_mfi_cmd *cmd,
                     u_int8_t status)
{
    struct mrsas_header *hdr = &cmd->frame->hdr;
    u_int8_t cmd_status = cmd->frame->hdr.cmd_status;

    /* Reset the retry counter for future re-tries */ 
    cmd->retry_for_fw_reset = 0;

    if (cmd->ccb_ptr)
        cmd->ccb_ptr = NULL;

    switch (hdr->cmd) {
        case MFI_CMD_INVALID:
            device_printf(sc->mrsas_dev, "MFI_CMD_INVALID command.\n");
            break;
        case MFI_CMD_PD_SCSI_IO:
        case MFI_CMD_LD_SCSI_IO:
            /*
             * MFI_CMD_PD_SCSI_IO and MFI_CMD_LD_SCSI_IO could have been
             * issued either through an IO path or an IOCTL path. If it
             * was via IOCTL, we will send it to internal completion.
             */
            if (cmd->sync_cmd) {
                cmd->sync_cmd = 0;
                mrsas_wakeup(sc, cmd);
                break;
            }
        case MFI_CMD_SMP:
        case MFI_CMD_STP:
        case MFI_CMD_DCMD:
            /* Check for LD map update */
            if ((cmd->frame->dcmd.opcode == MR_DCMD_LD_MAP_GET_INFO) && 
                (cmd->frame->dcmd.mbox.b[1] == 1)) {
                sc->fast_path_io = 0;
		        lockmgr(&sc->raidmap_lock, LK_EXCLUSIVE);
                if (cmd_status != 0) {
                    if (cmd_status != MFI_STAT_NOT_FOUND)
                        device_printf(sc->mrsas_dev, "map sync failed, status=%x\n",cmd_status);
                    else {
                        mrsas_release_mfi_cmd(cmd);
		        lockmgr(&sc->raidmap_lock, LK_RELEASE);
                        break;
                    }
                } 
                else 
                    sc->map_id++;
                mrsas_release_mfi_cmd(cmd);
                if (MR_ValidateMapInfo(sc))
                    sc->fast_path_io = 0;
                else
                    sc->fast_path_io = 1;
                mrsas_sync_map_info(sc);
                lockmgr(&sc->raidmap_lock, LK_RELEASE);
                break;
            }
#if 0 //currently not supporting event handling, so commenting out
            if (cmd->frame->dcmd.opcode == MR_DCMD_CTRL_EVENT_GET_INFO ||
                    cmd->frame->dcmd.opcode == MR_DCMD_CTRL_EVENT_GET) {
                mrsas_poll_wait_aen = 0;
            }
#endif
            /* See if got an event notification */
            if (cmd->frame->dcmd.opcode == MR_DCMD_CTRL_EVENT_WAIT)
                mrsas_complete_aen(sc, cmd);
            else
                mrsas_wakeup(sc, cmd);
            break;
        case MFI_CMD_ABORT:
            /* Command issued to abort another cmd return */
            mrsas_complete_abort(sc, cmd);
            break;
        default:
            device_printf(sc->mrsas_dev,"Unknown command completed! [0x%X]\n", hdr->cmd);
            break;
    }
}

/**
 * mrsas_wakeup -         Completes an internal command
 * input:                 Adapter soft state
 *                        Command to be completed
 *
 * In mrsas_issue_blocked_cmd(), after a command is issued to Firmware, 
 * a wait timer is started.  This function is called from  
 * mrsas_complete_mptmfi_passthru() as it completes the command,
 * to wake up from the command wait.
 */
void mrsas_wakeup(struct mrsas_softc *sc, struct mrsas_mfi_cmd *cmd)
{
    cmd->cmd_status = cmd->frame->io.cmd_status;

    if (cmd->cmd_status == ECONNREFUSED) 
        cmd->cmd_status = 0;

    /* For debug only ... */ 
    //device_printf(sc->mrsas_dev,"DCMD rec'd for wakeup, sc->chan=%p\n", sc->chan);

    sc->chan = (void*)&cmd;
    wakeup_one((void *)&sc->chan);
    return;
}

/**
 * mrsas_shutdown_ctlr:       Instructs FW to shutdown the controller
 * input:                     Adapter soft state
 *                            Shutdown/Hibernate
 *
 * This function issues a DCMD internal command to Firmware to initiate
 * shutdown of the controller.
 */
static void mrsas_shutdown_ctlr(struct mrsas_softc *sc, u_int32_t opcode)
{
    struct mrsas_mfi_cmd *cmd;
    struct mrsas_dcmd_frame *dcmd;

    if (sc->adprecovery == MRSAS_HW_CRITICAL_ERROR)
        return;

    cmd = mrsas_get_mfi_cmd(sc);
    if (!cmd) {
        device_printf(sc->mrsas_dev,"Cannot allocate for shutdown cmd.\n");
        return;
    }

	if (sc->aen_cmd)		
        mrsas_issue_blocked_abort_cmd(sc, sc->aen_cmd);
    
	if (sc->map_update_cmd)
        mrsas_issue_blocked_abort_cmd(sc, sc->map_update_cmd);

    dcmd = &cmd->frame->dcmd;
    memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);

    dcmd->cmd = MFI_CMD_DCMD;
    dcmd->cmd_status = 0x0;
    dcmd->sge_count = 0;
    dcmd->flags = MFI_FRAME_DIR_NONE;
    dcmd->timeout = 0;
    dcmd->pad_0 = 0;
    dcmd->data_xfer_len = 0;
    dcmd->opcode = opcode;

    device_printf(sc->mrsas_dev,"Preparing to shut down controller.\n");

    mrsas_issue_blocked_cmd(sc, cmd);
    mrsas_release_mfi_cmd(cmd);

    return;
}

/**
 * mrsas_flush_cache:         Requests FW to flush all its caches 
 * input:                     Adapter soft state
 *
 * This function is issues a DCMD internal command to Firmware to initiate
 * flushing of all caches.
 */
static void mrsas_flush_cache(struct mrsas_softc *sc)
{
    struct mrsas_mfi_cmd *cmd;
    struct mrsas_dcmd_frame *dcmd;

    if (sc->adprecovery == MRSAS_HW_CRITICAL_ERROR)
        return;

    cmd = mrsas_get_mfi_cmd(sc);
    if (!cmd) {
        device_printf(sc->mrsas_dev,"Cannot allocate for flush cache cmd.\n");
        return;
    }

    dcmd = &cmd->frame->dcmd;
    memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);

    dcmd->cmd = MFI_CMD_DCMD;
    dcmd->cmd_status = 0x0;
    dcmd->sge_count = 0;
    dcmd->flags = MFI_FRAME_DIR_NONE;
    dcmd->timeout = 0;
    dcmd->pad_0 = 0;
    dcmd->data_xfer_len = 0;
    dcmd->opcode = MR_DCMD_CTRL_CACHE_FLUSH;
    dcmd->mbox.b[0] = MR_FLUSH_CTRL_CACHE | MR_FLUSH_DISK_CACHE;

    mrsas_issue_blocked_cmd(sc, cmd);
    mrsas_release_mfi_cmd(cmd);

    return;
}

/**
 * mrsas_get_map_info:        Load and validate RAID map 
 * input:                     Adapter instance soft state
 *
 * This function calls mrsas_get_ld_map_info() and MR_ValidateMapInfo()
 * to load and validate RAID map.  It returns 0 if successful, 1 other-
 * wise. 
 */
static int mrsas_get_map_info(struct mrsas_softc *sc)
{ 
   uint8_t  retcode = 0;

    sc->fast_path_io = 0;
    if (!mrsas_get_ld_map_info(sc)) {
        retcode = MR_ValidateMapInfo(sc);
        if (retcode == 0) { 
            sc->fast_path_io = 1;
            return 0;
        }
    }
    return 1;
}

/**
 * mrsas_get_ld_map_info:      Get FW's ld_map structure
 * input:                      Adapter instance soft state
 *
 * Issues an internal command (DCMD) to get the FW's controller PD
 * list structure.  
 */
static int mrsas_get_ld_map_info(struct mrsas_softc *sc)
{
    int retcode = 0;
    struct mrsas_mfi_cmd *cmd;
    struct mrsas_dcmd_frame *dcmd;
    MR_FW_RAID_MAP_ALL *map;
    bus_addr_t map_phys_addr = 0;

    cmd = mrsas_get_mfi_cmd(sc);
    if (!cmd) {
        device_printf(sc->mrsas_dev, "Cannot alloc for ld map info cmd.\n");
        return 1;
    }

    dcmd = &cmd->frame->dcmd;

    map = sc->raidmap_mem[(sc->map_id & 1)];
    map_phys_addr = sc->raidmap_phys_addr[(sc->map_id & 1)];
    if (!map) {
        device_printf(sc->mrsas_dev, "Failed to alloc mem for ld map info.\n");
        mrsas_release_mfi_cmd(cmd);
        return (ENOMEM);
    }
    memset(map, 0, sizeof(*map));
    memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);

    dcmd->cmd = MFI_CMD_DCMD;
    dcmd->cmd_status = 0xFF;
    dcmd->sge_count = 1;
    dcmd->flags = MFI_FRAME_DIR_READ;
    dcmd->timeout = 0;
    dcmd->pad_0 = 0;
    dcmd->data_xfer_len = sc->map_sz;
    dcmd->opcode = MR_DCMD_LD_MAP_GET_INFO;
    dcmd->sgl.sge32[0].phys_addr = map_phys_addr;
    dcmd->sgl.sge32[0].length = sc->map_sz;
    if (!mrsas_issue_polled(sc, cmd))
        retcode = 0;
    else  
    {
        device_printf(sc->mrsas_dev, "Fail to send get LD map info cmd.\n");
        retcode = 1;
    }
    mrsas_release_mfi_cmd(cmd);
    return(retcode);
}

/**
 * mrsas_sync_map_info:        Get FW's ld_map structure
 * input:                      Adapter instance soft state
 *
 * Issues an internal command (DCMD) to get the FW's controller PD
 * list structure.  
 */
static int mrsas_sync_map_info(struct mrsas_softc *sc)
{
    int retcode = 0, i;
    struct mrsas_mfi_cmd *cmd;
    struct mrsas_dcmd_frame *dcmd;
    uint32_t size_sync_info, num_lds;
    MR_LD_TARGET_SYNC *target_map = NULL;
    MR_FW_RAID_MAP_ALL *map;
    MR_LD_RAID  *raid;
    MR_LD_TARGET_SYNC *ld_sync;
    bus_addr_t map_phys_addr = 0;

    cmd = mrsas_get_mfi_cmd(sc);
    if (!cmd) {
        device_printf(sc->mrsas_dev, "Cannot alloc for sync map info cmd\n");
        return 1;
    }

    map = sc->raidmap_mem[sc->map_id & 1];
    num_lds = map->raidMap.ldCount;
    
    dcmd = &cmd->frame->dcmd;
    size_sync_info = sizeof(MR_LD_TARGET_SYNC) * num_lds;
    memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);

    target_map = (MR_LD_TARGET_SYNC *)sc->raidmap_mem[(sc->map_id - 1) & 1];
    memset(target_map, 0, sizeof(MR_FW_RAID_MAP_ALL));

    map_phys_addr = sc->raidmap_phys_addr[(sc->map_id - 1) & 1];

    ld_sync = (MR_LD_TARGET_SYNC *)target_map;

    for (i = 0; i < num_lds; i++, ld_sync++) {
        raid = MR_LdRaidGet(i, map);
        ld_sync->targetId = MR_GetLDTgtId(i, map);
        ld_sync->seqNum = raid->seqNum;
    }

    dcmd->cmd = MFI_CMD_DCMD;
    dcmd->cmd_status = 0xFF;
    dcmd->sge_count = 1;
    dcmd->flags = MFI_FRAME_DIR_WRITE;
    dcmd->timeout = 0;
    dcmd->pad_0 = 0;
    dcmd->data_xfer_len = sc->map_sz;
    dcmd->mbox.b[0] = num_lds;
    dcmd->mbox.b[1] = MRSAS_DCMD_MBOX_PEND_FLAG;
    dcmd->opcode = MR_DCMD_LD_MAP_GET_INFO;
    dcmd->sgl.sge32[0].phys_addr = map_phys_addr;
    dcmd->sgl.sge32[0].length = sc->map_sz;

    sc->map_update_cmd = cmd;
    if (mrsas_issue_dcmd(sc, cmd)) {
        device_printf(sc->mrsas_dev, "Fail to send sync map info command.\n");
        return(1);
    }
    return(retcode);
}

/**
 * mrsas_get_pd_list:           Returns FW's PD list structure
 * input:                       Adapter soft state
 *
 * Issues an internal command (DCMD) to get the FW's controller PD
 * list structure.  This information is mainly used to find out about 
 * system supported by Firmware.
 */
static int mrsas_get_pd_list(struct mrsas_softc *sc)
{
    int retcode = 0, pd_index = 0, pd_count=0, pd_list_size;
    struct mrsas_mfi_cmd *cmd;
    struct mrsas_dcmd_frame *dcmd;
    struct MR_PD_LIST *pd_list_mem;
    struct MR_PD_ADDRESS *pd_addr;
    bus_addr_t pd_list_phys_addr = 0;
    struct mrsas_tmp_dcmd *tcmd;

    cmd = mrsas_get_mfi_cmd(sc);
    if (!cmd) {
        device_printf(sc->mrsas_dev, "Cannot alloc for get PD list cmd\n");
        return 1;
    }

    dcmd = &cmd->frame->dcmd;

    tcmd = kmalloc(sizeof(struct mrsas_tmp_dcmd), M_MRSAS, M_NOWAIT);
    pd_list_size = MRSAS_MAX_PD * sizeof(struct MR_PD_LIST);
    if (mrsas_alloc_tmp_dcmd(sc, tcmd, pd_list_size) != SUCCESS) {
        device_printf(sc->mrsas_dev, "Cannot alloc dmamap for get PD list cmd\n");
        mrsas_release_mfi_cmd(cmd);
        return(ENOMEM);
    }
    else {
        pd_list_mem = tcmd->tmp_dcmd_mem;
        pd_list_phys_addr = tcmd->tmp_dcmd_phys_addr;
    }
    memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);

    dcmd->mbox.b[0] = MR_PD_QUERY_TYPE_EXPOSED_TO_HOST;
    dcmd->mbox.b[1] = 0;
    dcmd->cmd = MFI_CMD_DCMD;
    dcmd->cmd_status = 0xFF;
    dcmd->sge_count = 1;
    dcmd->flags = MFI_FRAME_DIR_READ;
    dcmd->timeout = 0;
    dcmd->pad_0 = 0;
    dcmd->data_xfer_len = MRSAS_MAX_PD * sizeof(struct MR_PD_LIST);
    dcmd->opcode = MR_DCMD_PD_LIST_QUERY;
    dcmd->sgl.sge32[0].phys_addr = pd_list_phys_addr;
    dcmd->sgl.sge32[0].length = MRSAS_MAX_PD * sizeof(struct MR_PD_LIST);

    if (!mrsas_issue_polled(sc, cmd)) 
        retcode = 0;
    else 
        retcode = 1;

    /* Get the instance PD list */
    pd_count = MRSAS_MAX_PD;
    pd_addr = pd_list_mem->addr;
    if (retcode == 0 && pd_list_mem->count < pd_count) {
        memset(sc->local_pd_list, 0, MRSAS_MAX_PD * sizeof(struct mrsas_pd_list));
        for (pd_index = 0; pd_index < pd_list_mem->count; pd_index++) {
            sc->local_pd_list[pd_addr->deviceId].tid = pd_addr->deviceId;
            sc->local_pd_list[pd_addr->deviceId].driveType = pd_addr->scsiDevType;
            sc->local_pd_list[pd_addr->deviceId].driveState = MR_PD_STATE_SYSTEM;
            pd_addr++;
        }
    }

    /* Use mutext/spinlock if pd_list component size increase more than 32 bit. */
    memcpy(sc->pd_list, sc->local_pd_list, sizeof(sc->local_pd_list));
    mrsas_free_tmp_dcmd(tcmd);
    mrsas_release_mfi_cmd(cmd);
    kfree(tcmd, M_MRSAS);
    return(retcode);
}

/**
 * mrsas_get_ld_list:           Returns FW's LD list structure
 * input:                       Adapter soft state
 *
 * Issues an internal command (DCMD) to get the FW's controller PD
 * list structure.  This information is mainly used to find out about
 * supported by the FW.
 */
static int mrsas_get_ld_list(struct mrsas_softc *sc)
{
    int ld_list_size, retcode = 0, ld_index = 0, ids = 0;
    struct mrsas_mfi_cmd *cmd;
    struct mrsas_dcmd_frame *dcmd;
    struct MR_LD_LIST *ld_list_mem;
    bus_addr_t ld_list_phys_addr = 0;
    struct mrsas_tmp_dcmd *tcmd;

    cmd = mrsas_get_mfi_cmd(sc);
    if (!cmd) {
        device_printf(sc->mrsas_dev, "Cannot alloc for get LD list cmd\n");
        return 1;
    }

    dcmd = &cmd->frame->dcmd;

    tcmd = kmalloc(sizeof(struct mrsas_tmp_dcmd), M_MRSAS, M_NOWAIT);
    ld_list_size = sizeof(struct MR_LD_LIST);
    if (mrsas_alloc_tmp_dcmd(sc, tcmd, ld_list_size) != SUCCESS) {
        device_printf(sc->mrsas_dev, "Cannot alloc dmamap for get LD list cmd\n");
        mrsas_release_mfi_cmd(cmd);
        return(ENOMEM);
    }
    else {
        ld_list_mem = tcmd->tmp_dcmd_mem;
        ld_list_phys_addr = tcmd->tmp_dcmd_phys_addr;
    }
    memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);

    dcmd->cmd = MFI_CMD_DCMD;
    dcmd->cmd_status = 0xFF;
    dcmd->sge_count = 1;
    dcmd->flags = MFI_FRAME_DIR_READ;
    dcmd->timeout = 0;
    dcmd->data_xfer_len = sizeof(struct MR_LD_LIST);
    dcmd->opcode = MR_DCMD_LD_GET_LIST;
    dcmd->sgl.sge32[0].phys_addr = ld_list_phys_addr;
    dcmd->sgl.sge32[0].length = sizeof(struct MR_LD_LIST);
    dcmd->pad_0  = 0;

    if (!mrsas_issue_polled(sc, cmd)) 
        retcode = 0;
    else 
        retcode = 1;

     /* Get the instance LD list */ 
     if ((retcode == 0) && (ld_list_mem->ldCount <= (MAX_LOGICAL_DRIVES))){
        sc->CurLdCount = ld_list_mem->ldCount;
        memset(sc->ld_ids, 0xff, MRSAS_MAX_LD);
        for (ld_index = 0; ld_index < ld_list_mem->ldCount; ld_index++) {
            if (ld_list_mem->ldList[ld_index].state != 0) {
                ids = ld_list_mem->ldList[ld_index].ref.ld_context.targetId;
                sc->ld_ids[ids] = ld_list_mem->ldList[ld_index].ref.ld_context.targetId;
            }
        }
    } 

    mrsas_free_tmp_dcmd(tcmd);
    mrsas_release_mfi_cmd(cmd);
    kfree(tcmd, M_MRSAS);
    return(retcode);
}

/**
 * mrsas_alloc_tmp_dcmd:       Allocates memory for temporary command
 * input:                      Adapter soft state
 *                             Temp command
 *                             Size of alloction
 *
 * Allocates DMAable memory for a temporary internal command. The allocated
 * memory is initialized to all zeros upon successful loading of the dma 
 * mapped memory.
 */
int mrsas_alloc_tmp_dcmd(struct mrsas_softc *sc, struct mrsas_tmp_dcmd *tcmd, 
          int size)
{
    if (bus_dma_tag_create( sc->mrsas_parent_tag,   // parent
                            1, 0,                   // algnmnt, boundary
                            BUS_SPACE_MAXADDR_32BIT,// lowaddr
                            BUS_SPACE_MAXADDR,      // highaddr
                            NULL, NULL,             // filter, filterarg
                            size,                   // maxsize
                            1,                      // msegments
                            size,                   // maxsegsize
                            BUS_DMA_ALLOCNOW,       // flags
                            &tcmd->tmp_dcmd_tag)) {
        device_printf(sc->mrsas_dev, "Cannot allocate tmp dcmd tag\n");
        return (ENOMEM);
    }
    if (bus_dmamem_alloc(tcmd->tmp_dcmd_tag, (void **)&tcmd->tmp_dcmd_mem,
            BUS_DMA_NOWAIT, &tcmd->tmp_dcmd_dmamap)) {
        device_printf(sc->mrsas_dev, "Cannot allocate tmp dcmd mem\n");
        return (ENOMEM);
    }
    if (bus_dmamap_load(tcmd->tmp_dcmd_tag, tcmd->tmp_dcmd_dmamap,
            tcmd->tmp_dcmd_mem, size, mrsas_addr_cb,
            &tcmd->tmp_dcmd_phys_addr, BUS_DMA_NOWAIT)) {
        device_printf(sc->mrsas_dev, "Cannot load tmp dcmd mem\n");
        return (ENOMEM);
    }

    memset(tcmd->tmp_dcmd_mem, 0, size);
    return (0);
}

/**
 * mrsas_free_tmp_dcmd:      Free memory for temporary command 
 * input:                    temporary dcmd pointer 
 *
 * Deallocates memory of the temporary command for use in the construction
 * of the internal DCMD.
 */
void mrsas_free_tmp_dcmd(struct mrsas_tmp_dcmd *tmp)
{
    if (tmp->tmp_dcmd_phys_addr)
        bus_dmamap_unload(tmp->tmp_dcmd_tag, tmp->tmp_dcmd_dmamap);
    if (tmp->tmp_dcmd_mem != NULL)
        bus_dmamem_free(tmp->tmp_dcmd_tag, tmp->tmp_dcmd_mem, tmp->tmp_dcmd_dmamap);
    if (tmp->tmp_dcmd_tag != NULL)
        bus_dma_tag_destroy(tmp->tmp_dcmd_tag);
}

/**
 * mrsas_issue_blocked_abort_cmd:       Aborts previously issued cmd
 * input:                               Adapter soft state
 *                                      Previously issued cmd to be aborted
 *
 * This function is used to abort previously issued commands, such as AEN and 
 * RAID map sync map commands.  The abort command is sent as a DCMD internal 
 * command and subsequently the driver will wait for a return status.  The 
 * max wait time is MRSAS_INTERNAL_CMD_WAIT_TIME seconds. 
 */
static int mrsas_issue_blocked_abort_cmd(struct mrsas_softc *sc,
                                         struct mrsas_mfi_cmd *cmd_to_abort)
{
    struct mrsas_mfi_cmd *cmd;
    struct mrsas_abort_frame *abort_fr;
    u_int8_t retcode = 0;
    unsigned long total_time = 0;
    u_int8_t max_wait = MRSAS_INTERNAL_CMD_WAIT_TIME;

    cmd = mrsas_get_mfi_cmd(sc);
    if (!cmd) {
        device_printf(sc->mrsas_dev, "Cannot alloc for abort cmd\n");
        return(1);
    }

    abort_fr = &cmd->frame->abort;

    /* Prepare and issue the abort frame */
    abort_fr->cmd = MFI_CMD_ABORT;
    abort_fr->cmd_status = 0xFF;
    abort_fr->flags = 0;
    abort_fr->abort_context = cmd_to_abort->index;
    abort_fr->abort_mfi_phys_addr_lo = cmd_to_abort->frame_phys_addr;
    abort_fr->abort_mfi_phys_addr_hi = 0;

    cmd->sync_cmd = 1;
    cmd->cmd_status = 0xFF;

    if (mrsas_issue_dcmd(sc, cmd)) {
        device_printf(sc->mrsas_dev, "Fail to send abort command.\n");
        return(1);
    }

    /* Wait for this cmd to complete */
    sc->chan = (void*)&cmd;
    while (1) {
       if (cmd->cmd_status == 0xFF){
           tsleep((void *)&sc->chan, 0, "mrsas_sleep", hz);
       }
       else
           break;
       total_time++;
       if (total_time >= max_wait) {
           device_printf(sc->mrsas_dev, "Abort cmd timed out after %d sec.\n", max_wait);
           retcode = 1;
           break;
       } 
    }

    cmd->sync_cmd = 0;
    mrsas_release_mfi_cmd(cmd);
    return(retcode);
}

/**
 * mrsas_complete_abort:      Completes aborting a command
 * input:                     Adapter soft state
 *                            Cmd that was issued to abort another cmd
 *
 * The mrsas_issue_blocked_abort_cmd() function waits for the command status
 * to change after sending the command.  This function is called from 
 * mrsas_complete_mptmfi_passthru() to wake up the sleep thread associated.
 */
void mrsas_complete_abort(struct mrsas_softc *sc, struct mrsas_mfi_cmd *cmd)
{
    if (cmd->sync_cmd) {
        cmd->sync_cmd = 0;
        cmd->cmd_status = 0;
        sc->chan = (void*)&cmd;
        wakeup_one((void *)&sc->chan);
    }
    return;
}

/**
 * mrsas_aen_handler:		Callback function for AEN processing from thread context.
 * input:					Adapter soft state
 *
 */
void mrsas_aen_handler(struct mrsas_softc *sc)
{
	union mrsas_evt_class_locale class_locale;
	int     doscan = 0;
	u_int32_t seq_num;
	int error;

	if (!sc) {
		kprintf("invalid instance!\n");
		return;
	}

	if (sc->evt_detail_mem) {
		switch (sc->evt_detail_mem->code) {
			case MR_EVT_PD_INSERTED:
				mrsas_get_pd_list(sc);
				mrsas_bus_scan_sim(sc, sc->sim_1);
				doscan = 0;
				break;
			case MR_EVT_PD_REMOVED:
				mrsas_get_pd_list(sc);
				mrsas_bus_scan_sim(sc, sc->sim_1);
				doscan = 0;
				break;
			case MR_EVT_LD_OFFLINE:
			case MR_EVT_CFG_CLEARED:
			case MR_EVT_LD_DELETED:
				mrsas_bus_scan_sim(sc, sc->sim_0);
				doscan = 0;
				break;		
			case MR_EVT_LD_CREATED:
				mrsas_get_ld_list(sc);
				mrsas_bus_scan_sim(sc, sc->sim_0);
				doscan = 0;
				break;
			case MR_EVT_CTRL_HOST_BUS_SCAN_REQUESTED:
			case MR_EVT_FOREIGN_CFG_IMPORTED: 
			case MR_EVT_LD_STATE_CHANGE:
				doscan = 1;
				break;
			default:
				doscan = 0;
				break;
		}
	} else {
		device_printf(sc->mrsas_dev, "invalid evt_detail\n");
		return;
	}
	if (doscan) {
		mrsas_get_pd_list(sc);
		mrsas_dprint(sc, MRSAS_AEN, "scanning ...sim 1\n");
		mrsas_bus_scan_sim(sc, sc->sim_1);
		mrsas_get_ld_list(sc);
		mrsas_dprint(sc, MRSAS_AEN, "scanning ...sim 0\n");
		mrsas_bus_scan_sim(sc, sc->sim_0);
	}

	seq_num = sc->evt_detail_mem->seq_num + 1;

	// Register AEN with FW for latest sequence number plus 1
	class_locale.members.reserved = 0;
	class_locale.members.locale = MR_EVT_LOCALE_ALL;
	class_locale.members.class = MR_EVT_CLASS_DEBUG;
	
	if (sc->aen_cmd != NULL )
		return ; 

	lockmgr(&sc->aen_lock, LK_EXCLUSIVE);
	error = mrsas_register_aen(sc, seq_num,
					class_locale.word);
	lockmgr(&sc->aen_lock, LK_RELEASE);

	if (error)
		device_printf(sc->mrsas_dev, "register aen failed error %x\n", error);

}


/**
 * mrsas_complete_aen:        	Completes AEN command
 * input:                     	Adapter soft state
 *                            	Cmd that was issued to abort another cmd
 *
 * 								This function will be called from ISR and will continue 
 * 								event processing from thread context by enqueuing task
 * 								in ev_tq (callback function "mrsas_aen_handler").
 */
void mrsas_complete_aen(struct mrsas_softc *sc, struct mrsas_mfi_cmd *cmd)
{
	/*
	* Don't signal app if it is just an aborted previously registered aen
	*/
	if ((!cmd->abort_aen) && (sc->remove_in_progress == 0)) {
		/* TO DO (?) */
	}
	else
		cmd->abort_aen = 0;

	sc->aen_cmd = NULL;
	mrsas_release_mfi_cmd(cmd);

	if (!sc->remove_in_progress)
		taskqueue_enqueue(sc->ev_tq, &sc->ev_task);

	return;
}

static device_method_t mrsas_methods[] = {
    DEVMETHOD(device_probe,     mrsas_probe),
    DEVMETHOD(device_attach,    mrsas_attach),
    DEVMETHOD(device_detach,    mrsas_detach),
    DEVMETHOD(device_suspend,   mrsas_suspend),
    DEVMETHOD(device_resume,    mrsas_resume),
    DEVMETHOD(bus_print_child,  bus_generic_print_child),
    DEVMETHOD(bus_driver_added, bus_generic_driver_added),
    { 0, 0 }
};

static driver_t mrsas_driver = {
    "mrsas",
    mrsas_methods,
    sizeof(struct mrsas_softc)
};

static devclass_t       mrsas_devclass;
DRIVER_MODULE(mrsas, pci, mrsas_driver, mrsas_devclass, NULL, NULL);
MODULE_VERSION(mrsas, 1);
MODULE_DEPEND(mrsas, cam, 1, 1, 1);