freebsd-skq/sys/dev/mrsas/mrsas.c

/*
 * Copyright (c) 2015, AVAGO Tech. All rights reserved. Author: Marian Choy
 * Copyright (c) 2014, LSI Corp. All rights reserved. Author: Marian Choy
 * Support: freebsdraid@avagotech.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@avagotech.com> Mail to: AVAGO TECHNOLOGIES 1621
 * Barber Lane, Milpitas, CA 95035 ATTN: MegaRaid FreeBSD
 *
 */

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

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

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

#include <sys/sysctl.h>
#include <sys/types.h>
#include <sys/kthread.h>
#include <sys/taskqueue.h>
#include <sys/smp.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 d_poll_t mrsas_poll;

static struct mrsas_mgmt_info mrsas_mgmt_info;
static struct mrsas_ident *mrsas_find_ident(device_t);
static int mrsas_setup_msix(struct mrsas_softc *sc);
static int mrsas_allocate_msix(struct mrsas_softc *sc);
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, u_int32_t MSIxIndex);
static int mrsas_clear_intr(struct mrsas_softc *sc);
static int mrsas_get_ctrl_info(struct mrsas_softc *sc);
static void mrsas_update_ext_vd_details(struct mrsas_softc *sc);
static int
mrsas_issue_blocked_abort_cmd(struct mrsas_softc *sc,
    struct mrsas_mfi_cmd *cmd_to_abort);
static struct mrsas_softc *
mrsas_get_softc_instance(struct cdev *dev,
    u_long cmd, caddr_t arg);
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);
void	mrsas_complete_outstanding_ioctls(struct mrsas_softc *sc);
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, u_long ioctlCmd);
extern uint8_t MR_ValidateMapInfo(struct mrsas_softc *sc);
extern u_int16_t MR_GetLDTgtId(u_int32_t ld, MR_DRV_RAID_MAP_ALL * map);
extern MR_LD_RAID *MR_LdRaidGet(u_int32_t ld, MR_DRV_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, "AVAGO Thunderbolt SAS Controller"},
	{0x1000, MRSAS_INVADER, 0xffff, 0xffff, "AVAGO Invader SAS Controller"},
	{0x1000, MRSAS_FURY, 0xffff, 0xffff, "AVAGO Fury SAS Controller"},
	{0, 0, 0, 0, NULL}
};

/*
 * Character device entry points
 *
 */
static struct cdevsw mrsas_cdevsw = {
	.d_version = D_VERSION,
	.d_open = mrsas_open,
	.d_close = mrsas_close,
	.d_read = mrsas_read,
	.d_write = mrsas_write,
	.d_ioctl = mrsas_ioctl,
	.d_poll = mrsas_poll,
	.d_name = "mrsas",
};

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

/*
 * 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 cdev *dev, int oflags, int devtype, struct thread *td)
{
	struct mrsas_softc *sc;

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

int
mrsas_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
{
	struct mrsas_softc *sc;

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

int
mrsas_read(struct cdev *dev, struct uio *uio, int ioflag)
{
	struct mrsas_softc *sc;

	sc = dev->si_drv1;
	return (0);
}
int
mrsas_write(struct cdev *dev, struct uio *uio, int ioflag)
{
	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;

	sc->mask_interrupts = 1;
	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;

	sc->mask_interrupts = 0;
	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) {
		if (first_ctrl) {
			printf("AVAGO MegaRAID SAS FreeBSD mrsas driver version: %s\n",
			    MRSAS_VERSION);
			first_ctrl = 0;
		}
		device_set_desc(dev, id->desc);
		/* between BUS_PROBE_DEFAULT and BUS_PROBE_LOW_PRIORITY */
		return (-30);
	}
	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.
	 */
	snprintf(tmpstr, sizeof(tmpstr), "MRSAS controller %d",
	    device_get_unit(sc->mrsas_dev));
	snprintf(tmpstr2, sizeof(tmpstr2), "%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_mrsas), 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.val_rdonly, 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 global variables.
	 */
	TUNABLE_INT_FETCH("hw.mrsas.lb_pending_cmds", &sc->lb_pending_cmds);

	/* Grab the unit-instance variables */
	snprintf(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,
	    1, 0,
	    BUS_SPACE_MAXADDR_32BIT,
	    BUS_SPACE_MAXADDR,
	    NULL, NULL,
	    el_info_size,
	    1,
	    el_info_size,
	    BUS_DMA_ALLOCNOW,
	    NULL, NULL,
	    &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) {
				printf("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_setup_msix:	Allocate MSI-x vectors
 * @sc:					adapter soft state
 */
static int
mrsas_setup_msix(struct mrsas_softc *sc)
{
	int i;

	for (i = 0; i < sc->msix_vectors; i++) {
		sc->irq_context[i].sc = sc;
		sc->irq_context[i].MSIxIndex = i;
		sc->irq_id[i] = i + 1;
		sc->mrsas_irq[i] = bus_alloc_resource_any
		    (sc->mrsas_dev, SYS_RES_IRQ, &sc->irq_id[i]
		    ,RF_ACTIVE);
		if (sc->mrsas_irq[i] == NULL) {
			device_printf(sc->mrsas_dev, "Can't allocate MSI-x\n");
			goto irq_alloc_failed;
		}
		if (bus_setup_intr(sc->mrsas_dev,
		    sc->mrsas_irq[i],
		    INTR_MPSAFE | INTR_TYPE_CAM,
		    NULL, mrsas_isr, &sc->irq_context[i],
		    &sc->intr_handle[i])) {
			device_printf(sc->mrsas_dev,
			    "Cannot set up MSI-x interrupt handler\n");
			goto irq_alloc_failed;
		}
	}
	return SUCCESS;

irq_alloc_failed:
	mrsas_teardown_intr(sc);
	return (FAIL);
}

/*
 * mrsas_allocate_msix:		Setup MSI-x vectors
 * @sc:						adapter soft state
 */
static int
mrsas_allocate_msix(struct mrsas_softc *sc)
{
	if (pci_alloc_msix(sc->mrsas_dev, &sc->msix_vectors) == 0) {
		device_printf(sc->mrsas_dev, "Using MSI-X with %d number"
		    " of vectors\n", sc->msix_vectors);
	} else {
		device_printf(sc->mrsas_dev, "MSI-x setup failed\n");
		goto irq_alloc_failed;
	}
	return SUCCESS;

irq_alloc_failed:
	mrsas_teardown_intr(sc);
	return (FAIL);
}

/*
 * mrsas_attach:	PCI entry point
 * input:			pointer to device struct
 *
 * 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;
	struct cdev *linux_dev;

	/* 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_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 */
	mtx_init(&sc->sim_lock, "mrsas_sim_lock", NULL, MTX_DEF);
	mtx_init(&sc->pci_lock, "mrsas_pci_lock", NULL, MTX_DEF);
	mtx_init(&sc->io_lock, "mrsas_io_lock", NULL, MTX_DEF);
	mtx_init(&sc->aen_lock, "mrsas_aen_lock", NULL, MTX_DEF);
	mtx_init(&sc->ioctl_lock, "mrsas_ioctl_lock", NULL, MTX_SPIN);
	mtx_init(&sc->mpt_cmd_pool_lock, "mrsas_mpt_cmd_pool_lock", NULL, MTX_DEF);
	mtx_init(&sc->mfi_cmd_pool_lock, "mrsas_mfi_cmd_pool_lock", NULL, MTX_DEF);
	mtx_init(&sc->raidmap_lock, "mrsas_raidmap_lock", NULL, MTX_DEF);

	/*
	 * Intialize a counting Semaphore to take care no. of concurrent
	 * IOCTLs
	 */
	sema_init(&sc->ioctl_count_sema, MRSAS_MAX_MFI_CMDS - 5, IOCTL_SEMA_DESCRIPTION);

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

	mrsas_atomic_set(&sc->fw_outstanding, 0);

	sc->io_cmds_highwater = 0;

	/* Create a /dev entry for this device. */
	sc->mrsas_cdev = make_dev(&mrsas_cdevsw, device_get_unit(dev), UID_ROOT,
	    GID_OPERATOR, (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP), "mrsas%u",
	    device_get_unit(dev));
	if (device_get_unit(dev) == 0)
		make_dev_alias_p(MAKEDEV_CHECKNAME, &linux_dev, sc->mrsas_cdev,
		    "megaraid_sas_ioctl_node");
	if (sc->mrsas_cdev)
		sc->mrsas_cdev->si_drv1 = sc;

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

	sc->msix_enable = 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 = mrsas_kproc_create(mrsas_ocr_thread, sc,
	    &sc->ocr_thread, 0, 0, "mrsas_ocr%d",
	    device_get_unit(sc->mrsas_dev));
	if (error) {
		printf("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)) {
		printf("Error: start aen failed\n");
		goto fail_start_aen;
	}
	/*
	 * Add this controller to mrsas_mgmt_info structure so that it can be
	 * exported to management applications
	 */
	if (device_get_unit(dev) == 0)
		memset(&mrsas_mgmt_info, 0, sizeof(mrsas_mgmt_info));

	mrsas_mgmt_info.count++;
	mrsas_mgmt_info.sc_ptr[mrsas_mgmt_info.max_index] = sc;
	mrsas_mgmt_info.max_index++;

	return (0);

fail_start_aen:
attach_fail_irq:
	mrsas_teardown_intr(sc);
attach_fail_cam:
	mrsas_cam_detach(sc);
attach_fail_fw:
	/* if MSIX vector is allocated and FW Init FAILED then release MSIX */
	if (sc->msix_enable == 1)
		pci_release_msi(sc->mrsas_dev);
	mrsas_free_mem(sc);
	mtx_destroy(&sc->sim_lock);
	mtx_destroy(&sc->aen_lock);
	mtx_destroy(&sc->pci_lock);
	mtx_destroy(&sc->io_lock);
	mtx_destroy(&sc->ioctl_lock);
	mtx_destroy(&sc->mpt_cmd_pool_lock);
	mtx_destroy(&sc->mfi_cmd_pool_lock);
	mtx_destroy(&sc->raidmap_lock);
	/* Destroy the counting semaphore created for Ioctl */
	sema_destroy(&sc->ioctl_count_sema);
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:			pointer to device struct
 *
 * 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;

	/* Destroy the character device so no other IOCTL will be handled */
	destroy_dev(sc->mrsas_cdev);

	/*
	 * Take the instance off the instance array. Note that we will not
	 * decrement the max_index. We let this array be sparse array
	 */
	for (i = 0; i < mrsas_mgmt_info.max_index; i++) {
		if (mrsas_mgmt_info.sc_ptr[i] == sc) {
			mrsas_mgmt_info.count--;
			mrsas_mgmt_info.sc_ptr[i] = NULL;
			break;
		}
	}

	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);
		}
		pause("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);
		}
		pause("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);
	mtx_destroy(&sc->sim_lock);
	mtx_destroy(&sc->aen_lock);
	mtx_destroy(&sc->pci_lock);
	mtx_destroy(&sc->io_lock);
	mtx_destroy(&sc->ioctl_lock);
	mtx_destroy(&sc->mpt_cmd_pool_lock);
	mtx_destroy(&sc->mfi_cmd_pool_lock);
	mtx_destroy(&sc->raidmap_lock);

	/* Wait for all the semaphores to be released */
	while (sema_value(&sc->ioctl_count_sema) != (MRSAS_MAX_MFI_CMDS - 5))
		pause("mr_shutdown", hz);

	/* Destroy the counting semaphore created for Ioctl */
	sema_destroy(&sc->ioctl_count_sema);

	if (sc->reg_res) {
		bus_release_resource(sc->mrsas_dev,
		    SYS_RES_MEMORY, sc->reg_res_id, sc->reg_res);
	}
	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]);

		if (sc->ld_drv_map[i] != NULL)
			free(sc->ld_drv_map[i], M_MRSAS);
	}

	/*
	 * 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);
			free(sc->mpt_cmd_list[i], M_MRSAS);
		}
		free(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++) {
			free(sc->mfi_cmd_list[i], M_MRSAS);
		}
		free(sc->mfi_cmd_list, M_MRSAS);
		sc->mfi_cmd_list = NULL;
	}
	/*
	 * Free request descriptor memory
	 */
	free(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);

	/*
	 * Free ctrl_info memory
	 */
	if (sc->ctrl_info != NULL)
		free(sc->ctrl_info, M_MRSAS);
}

/*
 * 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)
{
	int i;

	if (!sc->msix_enable) {
		if (sc->intr_handle[0])
			bus_teardown_intr(sc->mrsas_dev, sc->mrsas_irq[0], sc->intr_handle[0]);
		if (sc->mrsas_irq[0] != NULL)
			bus_release_resource(sc->mrsas_dev, SYS_RES_IRQ,
			    sc->irq_id[0], sc->mrsas_irq[0]);
		sc->intr_handle[0] = NULL;
	} else {
		for (i = 0; i < sc->msix_vectors; i++) {
			if (sc->intr_handle[i])
				bus_teardown_intr(sc->mrsas_dev, sc->mrsas_irq[i],
				    sc->intr_handle[i]);

			if (sc->mrsas_irq[i] != NULL)
				bus_release_resource(sc->mrsas_dev, SYS_RES_IRQ,
				    sc->irq_id[i], sc->mrsas_irq[i]);

			sc->intr_handle[i] = NULL;
		}
		pci_release_msi(sc->mrsas_dev);
	}

}

/*
 * 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_get_softc_instance:    Find softc instance based on cmd type
 *
 * This function will return softc instance based on cmd type.
 * In some case, application fire ioctl on required management instance and
 * do not provide host_no. Use cdev->si_drv1 to get softc instance for those
 * case, else get the softc instance from host_no provided by application in
 * user data.
 */

static struct mrsas_softc *
mrsas_get_softc_instance(struct cdev *dev, u_long cmd, caddr_t arg)
{
	struct mrsas_softc *sc = NULL;
	struct mrsas_iocpacket *user_ioc = (struct mrsas_iocpacket *)arg;

	if (cmd == MRSAS_IOC_GET_PCI_INFO) {
		sc = dev->si_drv1;
	} else {
		/*
		 * get the Host number & the softc from data sent by the
		 * Application
		 */
		sc = mrsas_mgmt_info.sc_ptr[user_ioc->host_no];
		if ((user_ioc->host_no >= mrsas_mgmt_info.max_index) || (sc == NULL)) {
			if (sc == NULL)
				mrsas_dprint(sc, MRSAS_FAULT,
				    "There is no Controller number %d .\n", user_ioc->host_no);
			else
				mrsas_dprint(sc, MRSAS_FAULT,
				    "Invalid Controller number %d .\n", user_ioc->host_no);
		}
	}

	return sc;
}

/*
 * 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 cdev *dev, u_long cmd, caddr_t arg, int flag,
    struct thread *td)
{
	struct mrsas_softc *sc;
	int ret = 0, i = 0;
	MRSAS_DRV_PCI_INFORMATION *pciDrvInfo;

	sc = mrsas_get_softc_instance(dev, cmd, arg);
	if (!sc)
		return ENOENT;

	if (sc->remove_in_progress) {
		mrsas_dprint(sc, MRSAS_INFO,
		    "Driver remove or shutdown called.\n");
		return ENOENT;
	}
	mtx_lock_spin(&sc->ioctl_lock);
	if (!sc->reset_in_progress) {
		mtx_unlock_spin(&sc->ioctl_lock);
		goto do_ioctl;
	}
	mtx_unlock_spin(&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);
		}
		pause("mr_ioctl", hz);
	}

do_ioctl:
	switch (cmd) {
	case MRSAS_IOC_FIRMWARE_PASS_THROUGH64:
#ifdef COMPAT_FREEBSD32
	case MRSAS_IOC_FIRMWARE_PASS_THROUGH32:
#endif
		/*
		 * Decrement the Ioctl counting Semaphore before getting an
		 * mfi command
		 */
		sema_wait(&sc->ioctl_count_sema);

		ret = mrsas_passthru(sc, (void *)arg, cmd);

		/* Increment the Ioctl counting semaphore value */
		sema_post(&sc->ioctl_count_sema);

		break;
	case MRSAS_IOC_SCAN_BUS:
		ret = mrsas_bus_scan(sc);
		break;

	case MRSAS_IOC_GET_PCI_INFO:
		pciDrvInfo = (MRSAS_DRV_PCI_INFORMATION *) arg;
		memset(pciDrvInfo, 0, sizeof(MRSAS_DRV_PCI_INFORMATION));
		pciDrvInfo->busNumber = pci_get_bus(sc->mrsas_dev);
		pciDrvInfo->deviceNumber = pci_get_slot(sc->mrsas_dev);
		pciDrvInfo->functionNumber = pci_get_function(sc->mrsas_dev);
		pciDrvInfo->domainID = pci_get_domain(sc->mrsas_dev);
		mrsas_dprint(sc, MRSAS_INFO, "pci bus no: %d,"
		    "pci device no: %d, pci function no: %d,"
		    "pci domain ID: %d\n",
		    pciDrvInfo->busNumber, pciDrvInfo->deviceNumber,
		    pciDrvInfo->functionNumber, pciDrvInfo->domainID);
		ret = 0;
		break;

	default:
		mrsas_dprint(sc, MRSAS_TRACE, "IOCTL command 0x%lx is not handled\n", cmd);
		ret = ENOENT;
	}

	return (ret);
}

/*
 * mrsas_poll:	poll entry point for mrsas driver fd
 *
 * This function is the entry point for poll from the OS.  It waits for some AEN
 * events to be triggered from the controller and notifies back.
 */
static int
mrsas_poll(struct cdev *dev, int poll_events, struct thread *td)
{
	struct mrsas_softc *sc;
	int revents = 0;

	sc = dev->si_drv1;

	if (poll_events & (POLLIN | POLLRDNORM)) {
		if (sc->mrsas_aen_triggered) {
			revents |= poll_events & (POLLIN | POLLRDNORM);
		}
	}
	if (revents == 0) {
		if (poll_events & (POLLIN | POLLRDNORM)) {
			mtx_lock(&sc->aen_lock);
			sc->mrsas_poll_waiting = 1;
			selrecord(td, &sc->mrsas_select);
			mtx_unlock(&sc->aen_lock);
		}
	}
	return revents;
}

/*
 * 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)
{
	if (sc->msix_enable && (mrsas_setup_msix(sc) == SUCCESS))
		device_printf(sc->mrsas_dev, "MSI-x interrupts setup success\n");

	else {
		device_printf(sc->mrsas_dev, "Fall back to legacy interrupt\n");
		sc->irq_context[0].sc = sc;
		sc->irq_context[0].MSIxIndex = 0;
		sc->irq_id[0] = 0;
		sc->mrsas_irq[0] = bus_alloc_resource_any(sc->mrsas_dev,
		    SYS_RES_IRQ, &sc->irq_id[0], RF_SHAREABLE | RF_ACTIVE);
		if (sc->mrsas_irq[0] == NULL) {
			device_printf(sc->mrsas_dev, "Cannot allocate legcay"
			    "interrupt\n");
			return (FAIL);
		}
		if (bus_setup_intr(sc->mrsas_dev, sc->mrsas_irq[0],
		    INTR_MPSAFE | INTR_TYPE_CAM, NULL, mrsas_isr,
		    &sc->irq_context[0], &sc->intr_handle[0])) {
			device_printf(sc->mrsas_dev, "Cannot set up legacy"
			    "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_irq_context *irq_context = (struct mrsas_irq_context *)arg;
	struct mrsas_softc *sc = irq_context->sc;
	int status = 0;

	if (sc->mask_interrupts)
		return;

	if (!sc->msix_vectors) {
		status = mrsas_clear_intr(sc);
		if (!status)
			return;
	}
	/* If we are resetting, bail */
	if (mrsas_test_bit(MRSAS_FUSION_IN_RESET, &sc->reset_flags)) {
		printf(" 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, irq_context->MSIxIndex) != 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, u_int32_t MSIxIndex)
{
	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 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 += ((MSIxIndex * sc->reply_alloc_sz) / sizeof(MPI2_REPLY_DESCRIPTORS_UNION))
	    + sc->last_reply_idx[MSIxIndex];

	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) {
				mrsas_atomic_dec(&lbinfo->scsi_pending_cmds[cmd_mpt->pd_r1_lb]);
				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;
			mrsas_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[MSIxIndex]++;
		if (sc->last_reply_idx[MSIxIndex] >= sc->reply_q_depth)
			sc->last_reply_idx[MSIxIndex] = 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[MSIxIndex]) {
			desc = sc->reply_desc_mem;
			desc += ((MSIxIndex * sc->reply_alloc_sz) / sizeof(MPI2_REPLY_DESCRIPTORS_UNION));
		} 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) {
			if (sc->msix_enable) {
				if ((sc->device_id == MRSAS_INVADER) ||
				    (sc->device_id == MRSAS_FURY))
					mrsas_write_reg(sc, sc->msix_reg_offset[MSIxIndex / 8],
					    ((MSIxIndex & 0x7) << 24) |
					    sc->last_reply_idx[MSIxIndex]);
				else
					mrsas_write_reg(sc, sc->msix_reg_offset[0], (MSIxIndex << 24) |
					    sc->last_reply_idx[MSIxIndex]);
			} else
				mrsas_write_reg(sc, offsetof(mrsas_reg_set,
				    reply_post_host_index), sc->last_reply_idx[0]);

			threshold_reply_count = 0;
		}
	}

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

	/* Clear response interrupt */
	if (sc->msix_enable) {
		if ((sc->device_id == MRSAS_INVADER) ||
		    (sc->device_id == MRSAS_FURY)) {
			mrsas_write_reg(sc, sc->msix_reg_offset[MSIxIndex / 8],
			    ((MSIxIndex & 0x7) << 24) |
			    sc->last_reply_idx[MSIxIndex]);
		} else
			mrsas_write_reg(sc, sc->msix_reg_offset[0], (MSIxIndex << 24) |
			    sc->last_reply_idx[MSIxIndex]);
	} else
		mrsas_write_reg(sc, offsetof(mrsas_reg_set,
		    reply_post_host_index), sc->last_reply_idx[0]);

	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:
		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, count;

	/*
	 * 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 */
	    NULL, NULL,			/* lockfunc, lockarg */
	    &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,
	    1, 0,
	    BUS_SPACE_MAXADDR_32BIT,
	    BUS_SPACE_MAXADDR,
	    NULL, NULL,
	    verbuf_size,
	    1,
	    verbuf_size,
	    BUS_DMA_ALLOCNOW,
	    NULL, NULL,
	    &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,
	    16, 0,
	    BUS_SPACE_MAXADDR_32BIT,
	    BUS_SPACE_MAXADDR,
	    NULL, NULL,
	    io_req_size,
	    1,
	    io_req_size,
	    BUS_DMA_ALLOCNOW,
	    NULL, NULL,
	    &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,
	    4, 0,
	    BUS_SPACE_MAXADDR_32BIT,
	    BUS_SPACE_MAXADDR,
	    NULL, NULL,
	    chain_frame_size,
	    1,
	    chain_frame_size,
	    BUS_DMA_ALLOCNOW,
	    NULL, NULL,
	    &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);
	}
	count = sc->msix_vectors > 0 ? sc->msix_vectors : 1;
	/*
	 * Allocate Reply Descriptor Array
	 */
	reply_desc_size = sc->reply_alloc_sz * count;
	if (bus_dma_tag_create(sc->mrsas_parent_tag,
	    16, 0,
	    BUS_SPACE_MAXADDR_32BIT,
	    BUS_SPACE_MAXADDR,
	    NULL, NULL,
	    reply_desc_size,
	    1,
	    reply_desc_size,
	    BUS_DMA_ALLOCNOW,
	    NULL, NULL,
	    &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,
	    64, 0,
	    BUS_SPACE_MAXADDR_32BIT,
	    BUS_SPACE_MAXADDR,
	    NULL, NULL,
	    sense_size,
	    1,
	    sense_size,
	    BUS_DMA_ALLOCNOW,
	    NULL, NULL,
	    &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,
	    1, 0,
	    BUS_SPACE_MAXADDR_32BIT,
	    BUS_SPACE_MAXADDR,
	    NULL, NULL,
	    evt_detail_size,
	    1,
	    evt_detail_size,
	    BUS_DMA_ALLOCNOW,
	    NULL, NULL,
	    &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,
	    1,
	    0,
	    BUS_SPACE_MAXADDR,
	    BUS_SPACE_MAXADDR,
	    NULL, NULL,
	    MRSAS_MAX_IO_SIZE,
	    MRSAS_MAX_SGL,
	    MRSAS_MAX_IO_SIZE,
	    BUS_DMA_ALLOCNOW,
	    busdma_lock_mutex,
	    &sc->io_lock,
	    &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)
{
	int i;

	for (i = 0; i < 2; i++) {
		sc->ld_drv_map[i] =
		    (void *)malloc(sc->drv_map_sz, M_MRSAS, M_NOWAIT);
		/* Do Error handling */
		if (!sc->ld_drv_map[i]) {
			device_printf(sc->mrsas_dev, "Could not allocate memory for local map");

			if (i == 1)
				free(sc->ld_drv_map[0], M_MRSAS);
			/* ABORT driver initialization */
			goto ABORT;
		}
	}

	for (int i = 0; i < 2; i++) {
		if (bus_dma_tag_create(sc->mrsas_parent_tag,
		    4, 0,
		    BUS_SPACE_MAXADDR_32BIT,
		    BUS_SPACE_MAXADDR,
		    NULL, NULL,
		    sc->max_map_sz,
		    1,
		    sc->max_map_sz,
		    BUS_DMA_ALLOCNOW,
		    NULL, NULL,
		    &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);
		}
		bzero(sc->raidmap_mem[i], sc->max_map_sz);

		if (bus_dmamap_load(sc->raidmap_tag[i], sc->raidmap_dmamap[i],
		    sc->raidmap_mem[i], sc->max_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);

ABORT:
	return (1);
}

/*
 * 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)
{

	int ret, loop, ocr = 0;
	u_int32_t max_sectors_1;
	u_int32_t max_sectors_2;
	u_int32_t tmp_sectors;
	u_int32_t scratch_pad_2;
	int msix_enable = 0;
	int fw_msix_count = 0;

	/* Make sure Firmware is ready */
	ret = mrsas_transition_to_ready(sc, ocr);
	if (ret != SUCCESS) {
		return (ret);
	}
	/* MSI-x index 0- reply post host index register */
	sc->msix_reg_offset[0] = MPI2_REPLY_POST_HOST_INDEX_OFFSET;
	/* Check if MSI-X is supported while in ready state */
	msix_enable = (mrsas_read_reg(sc, offsetof(mrsas_reg_set, outbound_scratch_pad)) & 0x4000000) >> 0x1a;

	if (msix_enable) {
		scratch_pad_2 = mrsas_read_reg(sc, offsetof(mrsas_reg_set,
		    outbound_scratch_pad_2));

		/* Check max MSI-X vectors */
		if (sc->device_id == MRSAS_TBOLT) {
			sc->msix_vectors = (scratch_pad_2
			    & MR_MAX_REPLY_QUEUES_OFFSET) + 1;
			fw_msix_count = sc->msix_vectors;
		} else {
			/* Invader/Fury supports 96 MSI-X vectors */
			sc->msix_vectors = ((scratch_pad_2
			    & MR_MAX_REPLY_QUEUES_EXT_OFFSET)
			    >> MR_MAX_REPLY_QUEUES_EXT_OFFSET_SHIFT) + 1;
			fw_msix_count = sc->msix_vectors;

			for (loop = 1; loop < MR_MAX_MSIX_REG_ARRAY;
			    loop++) {
				sc->msix_reg_offset[loop] =
				    MPI2_SUP_REPLY_POST_HOST_INDEX_OFFSET +
				    (loop * 0x10);
			}
		}

		/* Don't bother allocating more MSI-X vectors than cpus */
		sc->msix_vectors = min(sc->msix_vectors,
		    mp_ncpus);

		/* Allocate MSI-x vectors */
		if (mrsas_allocate_msix(sc) == SUCCESS)
			sc->msix_enable = 1;
		else
			sc->msix_enable = 0;

		device_printf(sc->mrsas_dev, "FW supports <%d> MSIX vector,"
		    "Online CPU %d Current MSIX <%d>\n",
		    fw_msix_count, mp_ncpus, sc->msix_vectors);
	}
	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);
	}
	sc->ctrl_info = malloc(sizeof(struct mrsas_ctrl_info), M_MRSAS, M_NOWAIT);
	if (!sc->ctrl_info) {
		device_printf(sc->mrsas_dev, "Malloc for ctrl_info failed.\n");
		return (1);
	}
	/*
	 * Get the controller info from FW, so that the MAX VD support
	 * availability can be decided.
	 */
	if (mrsas_get_ctrl_info(sc)) {
		device_printf(sc->mrsas_dev, "Unable to get FW ctrl_info.\n");
		return (1);
	}
	sc->secure_jbod_support =
	    (u_int8_t)sc->ctrl_info->adapterOperations3.supportSecurityonJBOD;

	if (sc->secure_jbod_support)
		device_printf(sc->mrsas_dev, "FW supports SED \n");

	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_IDS);
	mrsas_get_ld_list(sc);

	/*
	 * 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;
	max_sectors_1 = (1 << sc->ctrl_info->stripe_sz_ops.min) *
	    sc->ctrl_info->max_strips_per_io;
	max_sectors_2 = sc->ctrl_info->max_request_size;
	tmp_sectors = min(max_sectors_1, max_sectors_2);
	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;

	sc->disableOnlineCtrlReset =
	    sc->ctrl_info->properties.OnOffProperties.disableOnlineCtrlReset;
	sc->UnevenSpanSupport =
	    sc->ctrl_info->adapterOperations2.supportUnevenSpans;
	if (sc->UnevenSpanSupport) {
		device_printf(sc->mrsas_dev, "FW supports: UnevenSpanSupport=%x\n\n",
		    sc->UnevenSpanSupport);

		if (MR_ValidateMapInfo(sc))
			sc->fast_path_io = 1;
		else
			sc->fast_path_io = 0;
	}
	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;
	int i = 0;

	/* 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 + 1 + 15) / 16 * 16) * 2;
	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;

	int count = sc->msix_vectors > 0 ? sc->msix_vectors : 1;

	for (i = 0; i < count; i++)
		sc->last_reply_idx[i] = 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,
	    1, 0,
	    BUS_SPACE_MAXADDR_32BIT,
	    BUS_SPACE_MAXADDR,
	    NULL, NULL,
	    ioc_init_size,
	    1,
	    ioc_init_size,
	    BUS_DMA_ALLOCNOW,
	    NULL, NULL,
	    &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;
	IOCInitMsg->HostMSIxVectors = (sc->msix_vectors > 0 ? sc->msix_vectors : 0);

	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;

	/* driver support Extended MSIX */
	if ((sc->device_id == MRSAS_INVADER) ||
	    (sc->device_id == MRSAS_FURY)) {
		init_frame->driver_operations.
		    mfi_capabilities.support_additional_msix = 1;
	}
	if (sc->verbuf_mem) {
		snprintf((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;
	}
	init_frame->driver_operations.mfi_capabilities.support_ndrive_r1_lb = 1;
	init_frame->driver_operations.mfi_capabilities.support_max_255lds = 1;
	init_frame->driver_operations.mfi_capabilities.security_protocol_cmds_fw = 1;
	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");
	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");
	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, count;
	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 = malloc(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 = malloc(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] = malloc(sizeof(struct mrsas_mpt_cmd),
		    M_MRSAS, M_NOWAIT);
		if (!sc->mpt_cmd_list[i]) {
			for (j = 0; j < i; j++)
				free(sc->mpt_cmd_list[j], M_MRSAS);
			free(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, 0);
		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;
	count = sc->msix_vectors > 0 ? sc->msix_vectors : 1;
	for (i = 0; i < sc->reply_q_depth * count; i++, reply_desc++) {
		reply_desc->Words = MRSAS_ULONG_MAX;
	}
	return (0);
}

/*
 * mrsas_fire_cmd:	Sends command to FW
 * input:			Adapter softstate
 * 					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)
{
	mtx_lock(&sc->pci_lock);
	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);
	mtx_unlock(&sc->pci_lock);
}

/*
 * 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");
	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;

	mtx_lock(&sc->mfi_cmd_pool_lock);
	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);
	}
	mtx_unlock(&sc->mfi_cmd_pool_lock);

	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;
	mtx_lock(&sc->sim_lock);
	for (;;) {
		/* Sleep for 1 second and check the queue status */
		msleep(&sc->ocr_chan, &sc->sim_lock, PRIBIO,
		    "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");
			mtx_lock_spin(&sc->ioctl_lock);
			sc->reset_in_progress = 1;
			sc->reset_count++;
			mtx_unlock_spin(&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;
		}
	}
	mtx_unlock(&sc->sim_lock);
	sc->ocr_thread_active = 0;
	mrsas_kproc_exit(0);
}

/*
 * 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, count;
	pMpi2ReplyDescriptorsUnion_t reply_desc;

	count = sc->msix_vectors > 0 ? sc->msix_vectors : 1;
	for (i = 0; i < count; i++)
		sc->last_reply_idx[i] = 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;
	}
	mrsas_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 */
		mtx_unlock(&sc->sim_lock);
		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);
				mrsas_atomic_dec(&sc->fw_outstanding);
			}
		}
		mtx_lock(&sc->sim_lock);

		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);
			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;
			}
			/* 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_EXT);

			if (mrsas_get_ctrl_info(sc)) {
				mrsas_kill_hba(sc);
				retval = FAIL;
				goto out;
			}
			if (!mrsas_get_map_info(sc))
				mrsas_sync_map_info(sc);

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

			/* 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 {
		mrsas_clear_bit(MRSAS_FUSION_IN_RESET, &sc->reset_flags);
		mrsas_enable_intr(sc);
		sc->adprecovery = MRSAS_HBA_OPERATIONAL;
	}
out:
	mrsas_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)
{
	sc->adprecovery = MRSAS_HW_CRITICAL_ERROR;
	pause("mrsas_kill_hba", 1000);
	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_complete_outstanding_ioctls(sc);
}

/**
 * mrsas_complete_outstanding_ioctls	Complete pending IOCTLS after kill_hba
 * input:			Controller softc
 *
 * Returns void
 */
void 
mrsas_complete_outstanding_ioctls(struct mrsas_softc *sc)
{
	int i;
	struct mrsas_mpt_cmd *cmd_mpt;
	struct mrsas_mfi_cmd *cmd_mfi;
	u_int32_t count, MSIxIndex;

	count = sc->msix_vectors > 0 ? sc->msix_vectors : 1;
	for (i = 0; i < sc->max_fw_cmds; i++) {
		cmd_mpt = sc->mpt_cmd_list[i];

		if (cmd_mpt->sync_cmd_idx != (u_int32_t)MRSAS_ULONG_MAX) {
			cmd_mfi = sc->mfi_cmd_list[cmd_mpt->sync_cmd_idx];
			if (cmd_mfi->sync_cmd && cmd_mfi->frame->hdr.cmd != MFI_CMD_ABORT) {
				for (MSIxIndex = 0; MSIxIndex < count; MSIxIndex++)
					mrsas_complete_mptmfi_passthru(sc, cmd_mfi,
					    cmd_mpt->io_request->RaidContext.status);
			}
		}
	}
}

/*
 * 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, count, MSIxIndex;


	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 = mrsas_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);
			count = sc->msix_vectors > 0 ? sc->msix_vectors : 1;
			for (MSIxIndex = 0; MSIxIndex < count; MSIxIndex++)
				mrsas_complete_cmd(sc, MSIxIndex);
		}
		DELAY(1000 * 1000);
	}

	if (mrsas_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;

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

	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)
{
	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(sc->ctrl_info, sc->ctlr_info_mem, sizeof(struct mrsas_ctrl_info));
	else
		retcode = 1;

	mrsas_update_ext_vd_details(sc);

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

/*
 * mrsas_update_ext_vd_details : Update details w.r.t Extended VD
 * input:
 *	sc - Controller's softc
*/
static void 
mrsas_update_ext_vd_details(struct mrsas_softc *sc)
{
	sc->max256vdSupport =
	sc->ctrl_info->adapterOperations3.supportMaxExtLDs;
	/* Below is additional check to address future FW enhancement */
	if (sc->ctrl_info->max_lds > 64)
		sc->max256vdSupport = 1;

	sc->drv_supported_vd_count = MRSAS_MAX_LD_CHANNELS
	    * MRSAS_MAX_DEV_PER_CHANNEL;
	sc->drv_supported_pd_count = MRSAS_MAX_PD_CHANNELS
	    * MRSAS_MAX_DEV_PER_CHANNEL;
	if (sc->max256vdSupport) {
		sc->fw_supported_vd_count = MAX_LOGICAL_DRIVES_EXT;
		sc->fw_supported_pd_count = MAX_PHYSICAL_DEVICES;
	} else {
		sc->fw_supported_vd_count = MAX_LOGICAL_DRIVES;
		sc->fw_supported_pd_count = MAX_PHYSICAL_DEVICES;
	}

	sc->old_map_sz = sizeof(MR_FW_RAID_MAP) +
	    (sizeof(MR_LD_SPAN_MAP) *
	    (sc->fw_supported_vd_count - 1));
	sc->new_map_sz = sizeof(MR_FW_RAID_MAP_EXT);
	sc->drv_map_sz = sizeof(MR_DRV_RAID_MAP) +
	    (sizeof(MR_LD_SPAN_MAP) *
	    (sc->drv_supported_vd_count - 1));

	sc->max_map_sz = max(sc->old_map_sz, sc->new_map_sz);

	if (sc->max256vdSupport)
		sc->current_map_sz = sc->new_map_sz;
	else
		sc->current_map_sz = sc->old_map_sz;
}

/*
 * 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,
	    1, 0,
	    BUS_SPACE_MAXADDR_32BIT,
	    BUS_SPACE_MAXADDR,
	    NULL, NULL,
	    ctlr_info_size,
	    1,
	    ctlr_info_size,
	    BUS_DMA_ALLOCNOW,
	    NULL, NULL,
	    &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;

	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;
			mtx_lock(&sc->raidmap_lock);
			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);
					mtx_unlock(&sc->raidmap_lock);
					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);
			mtx_unlock(&sc->raidmap_lock);
			break;
		}
		if (cmd->frame->dcmd.opcode == MR_DCMD_CTRL_EVENT_GET_INFO ||
		    cmd->frame->dcmd.opcode == MR_DCMD_CTRL_EVENT_GET) {
			sc->mrsas_aen_triggered = 0;
		}
		/* 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;

	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;
	void *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 = (void *)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(sc->max_map_sz));
	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->current_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->current_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_DRV_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->ld_drv_map[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, sc->max_map_sz);

	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->current_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->current_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 = malloc(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);
	free(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 = malloc(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);

	if (sc->max256vdSupport)
		dcmd->mbox.b[0] = 1;

	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;

#if VD_EXT_DEBUG
	printf("Number of LDs %d\n", ld_list_mem->ldCount);
#endif

	/* Get the instance LD list */
	if ((retcode == 0) &&
	    (ld_list_mem->ldCount <= sc->fw_supported_vd_count)) {
		sc->CurLdCount = ld_list_mem->ldCount;
		memset(sc->ld_ids, 0xff, MAX_LOGICAL_DRIVES_EXT);
		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);
	free(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,
	    1, 0,
	    BUS_SPACE_MAXADDR_32BIT,
	    BUS_SPACE_MAXADDR,
	    NULL, NULL,
	    size,
	    1,
	    size,
	    BUS_DMA_ALLOCNOW,
	    NULL, NULL,
	    &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:	AEN processing callback function from thread context
 * input:				Adapter soft state
 *
 * Asynchronous event handler
 */
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) {
		device_printf(sc->mrsas_dev, "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;

	mtx_lock(&sc->aen_lock);
	error = mrsas_register_aen(sc, seq_num,
	    class_locale.word);
	mtx_unlock(&sc->aen_lock);

	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)) {
		sc->mrsas_aen_triggered = 1;
		mtx_lock(&sc->aen_lock);
		if (sc->mrsas_poll_waiting) {
			sc->mrsas_poll_waiting = 0;
			selwakeup(&sc->mrsas_select);
		}
		mtx_unlock(&sc->aen_lock);
	} 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, 0, 0);
MODULE_DEPEND(mrsas, cam, 1, 1, 1);