freebsd-dev/sys/dev/mfi/mfi_tbolt.c

 /*-
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *            Copyright 1994-2009 The FreeBSD Project.
 *            All rights reserved.
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 *    THIS SOFTWARE IS PROVIDED BY THE FREEBSD PROJECT``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 FREEBSD PROJECT 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.
 */


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

#include "opt_mfi.h"

#include <sys/param.h>
#include <sys/types.h>
#include <sys/kernel.h>
#include <sys/selinfo.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/bio.h>
#include <sys/ioccom.h>
#include <sys/eventhandler.h>
#include <sys/callout.h>
#include <sys/uio.h>
#include <machine/bus.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/malloc.h>

#include <dev/mfi/mfireg.h>
#include <dev/mfi/mfi_ioctl.h>
#include <dev/mfi/mfivar.h>

struct mfi_cmd_tbolt *mfi_tbolt_get_cmd(struct mfi_softc *sc, struct mfi_command *);
union mfi_mpi2_request_descriptor *
mfi_tbolt_get_request_descriptor(struct mfi_softc *sc, uint16_t index);
void mfi_tbolt_complete_cmd(struct mfi_softc *sc);
int mfi_tbolt_build_io(struct mfi_softc *sc, struct mfi_command *mfi_cmd,
    struct mfi_cmd_tbolt *cmd);
union mfi_mpi2_request_descriptor *mfi_tbolt_build_mpt_cmd(struct mfi_softc
    *sc, struct mfi_command *cmd);
uint8_t
mfi_build_mpt_pass_thru(struct mfi_softc *sc, struct mfi_command *mfi_cmd);
union mfi_mpi2_request_descriptor *mfi_build_and_issue_cmd(struct mfi_softc
    *sc, struct mfi_command *mfi_cmd);
void mfi_tbolt_build_ldio(struct mfi_softc *sc, struct mfi_command *mfi_cmd,
    struct mfi_cmd_tbolt *cmd);
static int mfi_tbolt_make_sgl(struct mfi_softc *sc, struct mfi_command
    *mfi_cmd, pMpi25IeeeSgeChain64_t sgl_ptr, struct mfi_cmd_tbolt *cmd);
void
map_tbolt_cmd_status(struct mfi_command *mfi_cmd, uint8_t status,
     uint8_t ext_status);
static void mfi_issue_pending_cmds_again (struct mfi_softc *sc);
static void mfi_kill_hba (struct mfi_softc *sc);
static void mfi_process_fw_state_chg_isr(void *arg);
static void mfi_sync_map_complete(struct mfi_command *);
static void mfi_queue_map_sync(struct mfi_softc *sc);

#define MFI_FUSION_ENABLE_INTERRUPT_MASK	(0x00000008)


extern int	mfi_polled_cmd_timeout;
static int	mfi_fw_reset_test = 0;
#ifdef MFI_DEBUG
SYSCTL_INT(_hw_mfi, OID_AUTO, fw_reset_test, CTLFLAG_RWTUN, &mfi_fw_reset_test,
           0, "Force a firmware reset condition");
#endif

void
mfi_tbolt_enable_intr_ppc(struct mfi_softc *sc)
{
	MFI_WRITE4(sc, MFI_OMSK, ~MFI_FUSION_ENABLE_INTERRUPT_MASK);
	MFI_READ4(sc, MFI_OMSK);
}

void
mfi_tbolt_disable_intr_ppc(struct mfi_softc *sc)
{
	MFI_WRITE4(sc, MFI_OMSK, 0xFFFFFFFF);
	MFI_READ4(sc, MFI_OMSK);
}

int32_t
mfi_tbolt_read_fw_status_ppc(struct mfi_softc *sc)
{
	return MFI_READ4(sc, MFI_OSP0);
}

int32_t
mfi_tbolt_check_clear_intr_ppc(struct mfi_softc *sc)
{
	int32_t status, mfi_status = 0;

	status = MFI_READ4(sc, MFI_OSTS);

	if (status & 1) {
		MFI_WRITE4(sc, MFI_OSTS, status);
		MFI_READ4(sc, MFI_OSTS);
		if (status & MFI_STATE_CHANGE_INTERRUPT) {
			mfi_status |= MFI_FIRMWARE_STATE_CHANGE;
		}

		return mfi_status;
	}
	if (!(status & MFI_FUSION_ENABLE_INTERRUPT_MASK))
		return 1;

	MFI_READ4(sc, MFI_OSTS);
	return 0;
}


void
mfi_tbolt_issue_cmd_ppc(struct mfi_softc *sc, bus_addr_t bus_add,
   uint32_t frame_cnt)
{
	bus_add |= (MFI_REQ_DESCRIPT_FLAGS_MFA
	    << MFI_REQ_DESCRIPT_FLAGS_TYPE_SHIFT);
	MFI_WRITE4(sc, MFI_IQPL, (uint32_t)bus_add);
	MFI_WRITE4(sc, MFI_IQPH, (uint32_t)((uint64_t)bus_add >> 32));
}

/*
 * mfi_tbolt_adp_reset - For controller reset
 * @regs: MFI register set
 */
int
mfi_tbolt_adp_reset(struct mfi_softc *sc)
{
	int retry = 0, i = 0;
	int HostDiag;

	MFI_WRITE4(sc, MFI_WSR, 0xF);
	MFI_WRITE4(sc, MFI_WSR, 4);
	MFI_WRITE4(sc, MFI_WSR, 0xB);
	MFI_WRITE4(sc, MFI_WSR, 2);
	MFI_WRITE4(sc, MFI_WSR, 7);
	MFI_WRITE4(sc, MFI_WSR, 0xD);

	for (i = 0; i < 10000; i++) ;

	HostDiag = (uint32_t)MFI_READ4(sc, MFI_HDR);

	while (!( HostDiag & DIAG_WRITE_ENABLE)) {
		for (i = 0; i < 1000; i++);
		HostDiag = (uint32_t)MFI_READ4(sc, MFI_HDR);
		device_printf(sc->mfi_dev, "ADP_RESET_TBOLT: retry time=%d, "
		    "hostdiag=%#x\n", retry, HostDiag);

		if (retry++ >= 100)
			return 1;
	}

	device_printf(sc->mfi_dev, "ADP_RESET_TBOLT: HostDiag=%#x\n", HostDiag);

	MFI_WRITE4(sc, MFI_HDR, (HostDiag | DIAG_RESET_ADAPTER));

	for (i=0; i < 10; i++) {
		for (i = 0; i < 10000; i++);
	}

	HostDiag = (uint32_t)MFI_READ4(sc, MFI_RSR);
	while (HostDiag & DIAG_RESET_ADAPTER) {
		for (i = 0; i < 1000; i++) ;
		HostDiag = (uint32_t)MFI_READ4(sc, MFI_RSR);
		device_printf(sc->mfi_dev, "ADP_RESET_TBOLT: retry time=%d, "
		    "hostdiag=%#x\n", retry, HostDiag);

		if (retry++ >= 1000)
			return 1;
	}
	return 0;
}

/*
 * This routine initialize Thunderbolt specific device information
 */
void
mfi_tbolt_init_globals(struct mfi_softc *sc)
{
	/* Initialize single reply size and Message size */
	sc->reply_size = MEGASAS_THUNDERBOLT_REPLY_SIZE;
	sc->raid_io_msg_size = MEGASAS_THUNDERBOLT_NEW_MSG_SIZE;

	/*
	 * Calculating how many SGEs allowed in a allocated main message
	 * (size of the Message - Raid SCSI IO message size(except SGE))
	 * / size of SGE
	 * (0x100 - (0x90 - 0x10)) / 0x10 = 8
	 */
	sc->max_SGEs_in_main_message =
	    (uint8_t)((sc->raid_io_msg_size
	    - (sizeof(struct mfi_mpi2_request_raid_scsi_io)
	    - sizeof(MPI2_SGE_IO_UNION))) / sizeof(MPI2_SGE_IO_UNION));
	/*
	 * (Command frame size allocaed in SRB ext - Raid SCSI IO message size)
	 * / size of SGL ;
	 * (1280 - 256) / 16 = 64
	 */
	sc->max_SGEs_in_chain_message = (MR_COMMAND_SIZE
	    - sc->raid_io_msg_size) / sizeof(MPI2_SGE_IO_UNION);
	/*
	 * (0x08-1) + 0x40 = 0x47 - 0x01 = 0x46  one is left for command
	 * colscing
	*/
	sc->mfi_max_sge = (sc->max_SGEs_in_main_message - 1)
	    + sc->max_SGEs_in_chain_message - 1;
	/*
	* This is the offset in number of 4 * 32bit words to the next chain
	* (0x100 - 0x10)/0x10 = 0xF(15)
	*/
	sc->chain_offset_value_for_main_message = (sc->raid_io_msg_size
	    - sizeof(MPI2_SGE_IO_UNION))/16;
	sc->chain_offset_value_for_mpt_ptmsg
	    = offsetof(struct mfi_mpi2_request_raid_scsi_io, SGL)/16;
	sc->mfi_cmd_pool_tbolt = NULL;
	sc->request_desc_pool = NULL;
}

/*
 * This function calculates the memory requirement for Thunderbolt
 * controller, returns the total required memory in bytes
 */

uint32_t
mfi_tbolt_get_memory_requirement(struct mfi_softc *sc)
{
	uint32_t size;
	size = MEGASAS_THUNDERBOLT_MSG_ALLIGNMENT;	/* for Alignment */
	size += sc->raid_io_msg_size * (sc->mfi_max_fw_cmds + 1);
	size += sc->reply_size * sc->mfi_max_fw_cmds;
	/* this is for SGL's */
	size += MEGASAS_MAX_SZ_CHAIN_FRAME * sc->mfi_max_fw_cmds;
	return size;
}

/*
 * Description:
 *      This function will prepare message pools for the Thunderbolt controller
 * Arguments:
 *      DevExt - HBA miniport driver's adapter data storage structure
 *      pMemLocation - start of the memory allocated for Thunderbolt.
 * Return Value:
 *      TRUE if successful
 *      FALSE if failed
 */
int
mfi_tbolt_init_desc_pool(struct mfi_softc *sc, uint8_t* mem_location,
    uint32_t tbolt_contg_length)
{
	uint32_t     offset = 0;
	uint8_t      *addr = mem_location;

	/* Request Descriptor Base physical Address */

	/* For Request Decriptors Virtual Memory */
	/* Initialise the aligned IO Frames Virtual Memory Pointer */
	if (((uintptr_t)addr) & (0xFF)) {
		addr = &addr[sc->raid_io_msg_size];
		addr = (uint8_t *)((uintptr_t)addr & (~0xFF));
		sc->request_message_pool_align = addr;
	} else
		sc->request_message_pool_align = addr;

	offset = sc->request_message_pool_align - sc->request_message_pool;
	sc->request_msg_busaddr = sc->mfi_tb_busaddr + offset;

	/* DJA XXX should this be bus dma ??? */
	/* Skip request message pool */
	addr = &addr[sc->raid_io_msg_size * (sc->mfi_max_fw_cmds + 1)];
	/* Reply Frame Pool is initialized */
	sc->reply_frame_pool = (struct mfi_mpi2_reply_header *) addr;
	if (((uintptr_t)addr) & (0xFF)) {
		addr = &addr[sc->reply_size];
		addr = (uint8_t *)((uintptr_t)addr & (~0xFF));
	}
	sc->reply_frame_pool_align
		    = (struct mfi_mpi2_reply_header *)addr;

	offset = (uintptr_t)sc->reply_frame_pool_align
	    - (uintptr_t)sc->request_message_pool;
	sc->reply_frame_busaddr = sc->mfi_tb_busaddr + offset;

	/* Skip Reply Frame Pool */
	addr += sc->reply_size * sc->mfi_max_fw_cmds;
	sc->reply_pool_limit = addr;

	/* initializing reply address to 0xFFFFFFFF */
	memset((uint8_t *)sc->reply_frame_pool, 0xFF,
	       (sc->reply_size * sc->mfi_max_fw_cmds));

	offset = sc->reply_size * sc->mfi_max_fw_cmds;
	sc->sg_frame_busaddr = sc->reply_frame_busaddr + offset;
	/* initialize the last_reply_idx to 0 */
	sc->last_reply_idx = 0;
	MFI_WRITE4(sc, MFI_RFPI, sc->mfi_max_fw_cmds - 1);
	MFI_WRITE4(sc, MFI_RPI, sc->last_reply_idx);
	offset = (sc->sg_frame_busaddr + (MEGASAS_MAX_SZ_CHAIN_FRAME *
	    sc->mfi_max_fw_cmds)) - sc->mfi_tb_busaddr;
	if (offset > tbolt_contg_length)
		device_printf(sc->mfi_dev, "Error:Initialized more than "
		    "allocated\n");
	return 0;
}

/*
 * This routine prepare and issue INIT2 frame to the Firmware
 */

int
mfi_tbolt_init_MFI_queue(struct mfi_softc *sc)
{
	struct MPI2_IOC_INIT_REQUEST   *mpi2IocInit;
	struct mfi_init_frame		*mfi_init;
	uintptr_t			offset = 0;
	bus_addr_t			phyAddress;
	MFI_ADDRESS			*mfiAddressTemp;
	struct mfi_command		*cm, cmd_tmp;
	int error;

	mtx_assert(&sc->mfi_io_lock, MA_OWNED);

	/* Check if initialization is already completed */
	if (sc->MFA_enabled) {
		device_printf(sc->mfi_dev, "tbolt_init already initialised!\n");
		return 1;
	}

	if ((cm = mfi_dequeue_free(sc)) == NULL) {
		device_printf(sc->mfi_dev, "tbolt_init failed to get command "
		    " entry!\n");
		return (EBUSY);
	}

	cmd_tmp.cm_frame = cm->cm_frame;
	cmd_tmp.cm_frame_busaddr = cm->cm_frame_busaddr;
	cmd_tmp.cm_dmamap = cm->cm_dmamap;

	cm->cm_frame = (union mfi_frame *)((uintptr_t)sc->mfi_tb_init);
	cm->cm_frame_busaddr = sc->mfi_tb_init_busaddr;
	cm->cm_dmamap = sc->mfi_tb_init_dmamap;
	cm->cm_frame->header.context = 0;

	/*
	 * Abuse the SG list area of the frame to hold the init_qinfo
	 * object;
	 */
	mfi_init = &cm->cm_frame->init;

	mpi2IocInit = (struct MPI2_IOC_INIT_REQUEST *)sc->mfi_tb_ioc_init_desc;
	bzero(mpi2IocInit, sizeof(struct MPI2_IOC_INIT_REQUEST));
	mpi2IocInit->Function  = MPI2_FUNCTION_IOC_INIT;
	mpi2IocInit->WhoInit   = MPI2_WHOINIT_HOST_DRIVER;

	/* set MsgVersion and HeaderVersion host driver was built with */
	mpi2IocInit->MsgVersion = MPI2_VERSION;
	mpi2IocInit->HeaderVersion = MPI2_HEADER_VERSION;
	mpi2IocInit->SystemRequestFrameSize = sc->raid_io_msg_size/4;
	mpi2IocInit->ReplyDescriptorPostQueueDepth
	    = (uint16_t)sc->mfi_max_fw_cmds;
	mpi2IocInit->ReplyFreeQueueDepth = 0; /* Not supported by MR. */

	/* Get physical address of reply frame pool */
	offset = (uintptr_t) sc->reply_frame_pool_align
	    - (uintptr_t)sc->request_message_pool;
	phyAddress = sc->mfi_tb_busaddr + offset;
	mfiAddressTemp =
	    (MFI_ADDRESS *)&mpi2IocInit->ReplyDescriptorPostQueueAddress;
	mfiAddressTemp->u.addressLow = (uint32_t)phyAddress;
	mfiAddressTemp->u.addressHigh = (uint32_t)((uint64_t)phyAddress >> 32);

	/* Get physical address of request message pool */
	offset = sc->request_message_pool_align - sc->request_message_pool;
	phyAddress =  sc->mfi_tb_busaddr + offset;
	mfiAddressTemp = (MFI_ADDRESS *)&mpi2IocInit->SystemRequestFrameBaseAddress;
	mfiAddressTemp->u.addressLow = (uint32_t)phyAddress;
	mfiAddressTemp->u.addressHigh = (uint32_t)((uint64_t)phyAddress >> 32);
	mpi2IocInit->ReplyFreeQueueAddress =  0; /* Not supported by MR. */
	mpi2IocInit->TimeStamp = time_uptime;

	if (sc->verbuf) {
		snprintf((char *)sc->verbuf, strlen(MEGASAS_VERSION) + 2, "%s\n",
                MEGASAS_VERSION);
		mfi_init->driver_ver_lo = (uint32_t)sc->verbuf_h_busaddr;
		mfi_init->driver_ver_hi =
		    (uint32_t)((uint64_t)sc->verbuf_h_busaddr >> 32);
	}
	/* Get the physical address of the mpi2 ioc init command */
	phyAddress =  sc->mfi_tb_ioc_init_busaddr;
	mfi_init->qinfo_new_addr_lo = (uint32_t)phyAddress;
	mfi_init->qinfo_new_addr_hi = (uint32_t)((uint64_t)phyAddress >> 32);
	mfi_init->header.flags |= MFI_FRAME_DONT_POST_IN_REPLY_QUEUE;

	mfi_init->header.cmd = MFI_CMD_INIT;
	mfi_init->header.data_len = sizeof(struct MPI2_IOC_INIT_REQUEST);
	mfi_init->header.cmd_status = MFI_STAT_INVALID_STATUS;

	cm->cm_data = NULL;
	cm->cm_flags |= MFI_CMD_POLLED;
	cm->cm_timestamp = time_uptime;
	if ((error = mfi_mapcmd(sc, cm)) != 0) {
		device_printf(sc->mfi_dev, "failed to send IOC init2 "
		    "command %d at %lx\n", error, (long)cm->cm_frame_busaddr);
		goto out;
	}

	if (mfi_init->header.cmd_status == MFI_STAT_OK) {
		sc->MFA_enabled = 1;
	} else {
		device_printf(sc->mfi_dev, "Init command Failed %#x\n",
		    mfi_init->header.cmd_status);
		error = mfi_init->header.cmd_status;
		goto out;
	}

out:
	cm->cm_frame = cmd_tmp.cm_frame;
	cm->cm_frame_busaddr = cmd_tmp.cm_frame_busaddr;
	cm->cm_dmamap = cmd_tmp.cm_dmamap;
	mfi_release_command(cm);

	return (error);

}

int
mfi_tbolt_alloc_cmd(struct mfi_softc *sc)
{
	struct mfi_cmd_tbolt *cmd;
	bus_addr_t io_req_base_phys;
	uint8_t *io_req_base;
	int i = 0, j = 0, offset = 0;

	/*
	 * sc->mfi_cmd_pool_tbolt is an array of struct mfi_cmd_tbolt pointers.
	 * Allocate the dynamic array first and then allocate individual
	 * commands.
	 */
	sc->request_desc_pool = malloc(sizeof(
	    union mfi_mpi2_request_descriptor) * sc->mfi_max_fw_cmds,
	    M_MFIBUF, M_NOWAIT|M_ZERO);

	if (sc->request_desc_pool == NULL) {
		device_printf(sc->mfi_dev, "Could not alloc "
		    "memory for request_desc_pool\n");
		return (ENOMEM);
	}

	sc->mfi_cmd_pool_tbolt = malloc(sizeof(struct mfi_cmd_tbolt*)
	    * sc->mfi_max_fw_cmds, M_MFIBUF, M_NOWAIT|M_ZERO);

	if (sc->mfi_cmd_pool_tbolt == NULL) {
		free(sc->request_desc_pool, M_MFIBUF);
		device_printf(sc->mfi_dev, "Could not alloc "
		    "memory for cmd_pool_tbolt\n");
		return (ENOMEM);
	}

	for (i = 0; i < sc->mfi_max_fw_cmds; i++) {
		sc->mfi_cmd_pool_tbolt[i] = malloc(sizeof(
		    struct mfi_cmd_tbolt),M_MFIBUF, M_NOWAIT|M_ZERO);

		if (!sc->mfi_cmd_pool_tbolt[i]) {
			device_printf(sc->mfi_dev, "Could not alloc "
			    "cmd_pool_tbolt entry\n");

			for (j = 0; j < i; j++)
				free(sc->mfi_cmd_pool_tbolt[j], M_MFIBUF);

			free(sc->request_desc_pool, M_MFIBUF);
			sc->request_desc_pool = NULL;
			free(sc->mfi_cmd_pool_tbolt, M_MFIBUF);
			sc->mfi_cmd_pool_tbolt = NULL;

			return (ENOMEM);
		}
	}

	/*
	 * The first 256 bytes (SMID 0) is not used. Don't add to the cmd
	 * list
	 */
	io_req_base = sc->request_message_pool_align
		+ MEGASAS_THUNDERBOLT_NEW_MSG_SIZE;
	io_req_base_phys = sc->request_msg_busaddr
		+ MEGASAS_THUNDERBOLT_NEW_MSG_SIZE;

	/*
	 * Add all the commands to command pool (instance->cmd_pool)
	 */
	/* SMID 0 is reserved. Set SMID/index from 1 */

	for (i = 0; i < sc->mfi_max_fw_cmds; i++) {
		cmd = sc->mfi_cmd_pool_tbolt[i];
		offset = MEGASAS_THUNDERBOLT_NEW_MSG_SIZE * i;
		cmd->index = i + 1;
		cmd->request_desc = (union mfi_mpi2_request_descriptor *)
		    (sc->request_desc_pool + i);
		cmd->io_request = (struct mfi_mpi2_request_raid_scsi_io *)
		    (io_req_base + offset);
		cmd->io_request_phys_addr = io_req_base_phys + offset;
		cmd->sg_frame = (MPI2_SGE_IO_UNION *)(sc->reply_pool_limit
		    + i * MEGASAS_MAX_SZ_CHAIN_FRAME);
		cmd->sg_frame_phys_addr = sc->sg_frame_busaddr + i
		    * MEGASAS_MAX_SZ_CHAIN_FRAME;
		cmd->sync_cmd_idx = sc->mfi_max_fw_cmds;

		TAILQ_INSERT_TAIL(&(sc->mfi_cmd_tbolt_tqh), cmd, next);
	}
	return 0;
}

int
mfi_tbolt_reset(struct mfi_softc *sc)
{
	uint32_t fw_state;

	mtx_lock(&sc->mfi_io_lock);
	if (sc->hw_crit_error) {
		device_printf(sc->mfi_dev, "HW CRITICAL ERROR\n");
		mtx_unlock(&sc->mfi_io_lock);
		return 1;
	}

	if (sc->mfi_flags & MFI_FLAGS_TBOLT) {
		fw_state = sc->mfi_read_fw_status(sc);
		if ((fw_state & MFI_FWSTATE_FAULT) == MFI_FWSTATE_FAULT ||
		    mfi_fw_reset_test) {
			if ((sc->disableOnlineCtrlReset == 0)
			    && (sc->adpreset == 0)) {
				device_printf(sc->mfi_dev, "Adapter RESET "
				    "condition is detected\n");
				sc->adpreset = 1;
				sc->issuepend_done = 0;
				sc->MFA_enabled = 0;
				sc->last_reply_idx = 0;
				mfi_process_fw_state_chg_isr((void *) sc);
			}
			mtx_unlock(&sc->mfi_io_lock);
			return 0;
		}
	}
	mtx_unlock(&sc->mfi_io_lock);
	return 1;
}

/*
 * mfi_intr_tbolt - isr entry point
 */
void
mfi_intr_tbolt(void *arg)
{
	struct mfi_softc *sc = (struct mfi_softc *)arg;

	if (sc->mfi_check_clear_intr(sc) == 1) {
		return;
	}
	if (sc->mfi_detaching)
		return;
	mtx_lock(&sc->mfi_io_lock);
	mfi_tbolt_complete_cmd(sc);
	sc->mfi_flags &= ~MFI_FLAGS_QFRZN;
	mfi_startio(sc);
	mtx_unlock(&sc->mfi_io_lock);
	return;
}

/*
 * map_cmd_status -	Maps FW cmd status to OS cmd status
 * @cmd :		Pointer to cmd
 * @status :		status of cmd returned by FW
 * @ext_status :	ext status of cmd returned by FW
 */

void
map_tbolt_cmd_status(struct mfi_command *mfi_cmd, uint8_t status,
    uint8_t ext_status)
{
	switch (status) {
	case MFI_STAT_OK:
		mfi_cmd->cm_frame->header.cmd_status = MFI_STAT_OK;
		mfi_cmd->cm_frame->dcmd.header.cmd_status = MFI_STAT_OK;
		mfi_cmd->cm_error = MFI_STAT_OK;
		break;

	case MFI_STAT_SCSI_IO_FAILED:
	case MFI_STAT_LD_INIT_IN_PROGRESS:
		mfi_cmd->cm_frame->header.cmd_status = status;
		mfi_cmd->cm_frame->header.scsi_status = ext_status;
		mfi_cmd->cm_frame->dcmd.header.cmd_status = status;
		mfi_cmd->cm_frame->dcmd.header.scsi_status
		    = ext_status;
		break;

	case MFI_STAT_SCSI_DONE_WITH_ERROR:
		mfi_cmd->cm_frame->header.cmd_status = ext_status;
		mfi_cmd->cm_frame->dcmd.header.cmd_status = ext_status;
		break;

	case MFI_STAT_LD_OFFLINE:
	case MFI_STAT_DEVICE_NOT_FOUND:
		mfi_cmd->cm_frame->header.cmd_status = status;
		mfi_cmd->cm_frame->dcmd.header.cmd_status = status;
		break;

	default:
		mfi_cmd->cm_frame->header.cmd_status = status;
		mfi_cmd->cm_frame->dcmd.header.cmd_status = status;
		break;
	}
}

/*
 * mfi_tbolt_return_cmd -	Return a cmd to free command pool
 * @instance:		Adapter soft state
 * @tbolt_cmd:		Tbolt command packet to be returned to free command pool
 * @mfi_cmd:		Oning MFI command packe
 */
void
mfi_tbolt_return_cmd(struct mfi_softc *sc, struct mfi_cmd_tbolt *tbolt_cmd,
    struct mfi_command *mfi_cmd)
{
	mtx_assert(&sc->mfi_io_lock, MA_OWNED);

	mfi_cmd->cm_flags &= ~MFI_CMD_TBOLT;
	mfi_cmd->cm_extra_frames = 0;
	tbolt_cmd->sync_cmd_idx = sc->mfi_max_fw_cmds;

	TAILQ_INSERT_TAIL(&sc->mfi_cmd_tbolt_tqh, tbolt_cmd, next);
}

void
mfi_tbolt_complete_cmd(struct mfi_softc *sc)
{
	struct mfi_mpi2_reply_header *desc, *reply_desc;
	struct mfi_command *cmd_mfi;	/* For MFA Cmds */
	struct mfi_cmd_tbolt *cmd_tbolt;
	uint16_t smid;
	uint8_t reply_descript_type;
	struct mfi_mpi2_request_raid_scsi_io  *scsi_io_req;
	uint32_t status, extStatus;
	uint16_t num_completed;
	union desc_value val;
	mtx_assert(&sc->mfi_io_lock, MA_OWNED);

	desc = (struct mfi_mpi2_reply_header *)
		((uintptr_t)sc->reply_frame_pool_align
		+ sc->last_reply_idx * sc->reply_size);
	reply_desc = desc;

	if (reply_desc == NULL) {
		device_printf(sc->mfi_dev, "reply desc is NULL!!\n");
		return;
	}

	reply_descript_type = reply_desc->ReplyFlags
	     & MPI2_RPY_DESCRIPT_FLAGS_TYPE_MASK;
	if (reply_descript_type == MPI2_RPY_DESCRIPT_FLAGS_UNUSED)
		return;

	num_completed = 0;
	val.word = ((union mfi_mpi2_reply_descriptor *)desc)->words;

	/* Read Reply descriptor */
	while ((val.u.low != 0xFFFFFFFF) && (val.u.high != 0xFFFFFFFF)) {
		smid = reply_desc->SMID;
		if (smid == 0 || smid > sc->mfi_max_fw_cmds) {
			device_printf(sc->mfi_dev, "smid is %d cannot "
			    "proceed - skipping\n", smid);
			goto next;
		}
		cmd_tbolt = sc->mfi_cmd_pool_tbolt[smid - 1];
		if (cmd_tbolt->sync_cmd_idx == sc->mfi_max_fw_cmds) {
			device_printf(sc->mfi_dev, "cmd_tbolt %p "
			    "has invalid sync_cmd_idx=%d - skipping\n",
			    cmd_tbolt, cmd_tbolt->sync_cmd_idx);
			goto next;
		}
		cmd_mfi = &sc->mfi_commands[cmd_tbolt->sync_cmd_idx];
		scsi_io_req = cmd_tbolt->io_request;

		status = cmd_mfi->cm_frame->dcmd.header.cmd_status;
		extStatus = cmd_mfi->cm_frame->dcmd.header.scsi_status;
		map_tbolt_cmd_status(cmd_mfi, status, extStatus);

		/* mfi_tbolt_return_cmd is handled by mfi complete / return */
		if ((cmd_mfi->cm_flags & MFI_CMD_SCSI) != 0 &&
		    (cmd_mfi->cm_flags & MFI_CMD_POLLED) != 0) {
			/* polled LD/SYSPD IO command */
			/* XXX mark okay for now DJA */
			cmd_mfi->cm_frame->header.cmd_status = MFI_STAT_OK;

		} else {
			/* remove command from busy queue if not polled */
			if ((cmd_mfi->cm_flags & MFI_ON_MFIQ_BUSY) != 0)
				mfi_remove_busy(cmd_mfi);

			/* complete the command */
			mfi_complete(sc, cmd_mfi);
		}

next:
		sc->last_reply_idx++;
		if (sc->last_reply_idx >= sc->mfi_max_fw_cmds) {
			MFI_WRITE4(sc, MFI_RPI, sc->last_reply_idx);
			sc->last_reply_idx = 0;
		}

		/* Set it back to all 0xfff */
		((union mfi_mpi2_reply_descriptor*)desc)->words =
			~((uint64_t)0x00);

		num_completed++;

		/* Get the next reply descriptor */
		desc = (struct mfi_mpi2_reply_header *)
		    ((uintptr_t)sc->reply_frame_pool_align
		    + sc->last_reply_idx * sc->reply_size);
		reply_desc = desc;
		val.word = ((union mfi_mpi2_reply_descriptor*)desc)->words;
		reply_descript_type = reply_desc->ReplyFlags
		    & MPI2_RPY_DESCRIPT_FLAGS_TYPE_MASK;
		if (reply_descript_type == MPI2_RPY_DESCRIPT_FLAGS_UNUSED)
			break;
	}

	if (!num_completed)
		return;

	/* update replyIndex to FW */
	if (sc->last_reply_idx)
		MFI_WRITE4(sc, MFI_RPI, sc->last_reply_idx);

	return;
}

/*
 * mfi_get_cmd -	Get a command from the free pool
 * @instance:		Adapter soft state
 *
 * Returns a free command from the pool
 */

struct mfi_cmd_tbolt *
mfi_tbolt_get_cmd(struct mfi_softc *sc, struct mfi_command *mfi_cmd)
{
	struct mfi_cmd_tbolt *cmd = NULL;

	mtx_assert(&sc->mfi_io_lock, MA_OWNED);

	if ((cmd = TAILQ_FIRST(&sc->mfi_cmd_tbolt_tqh)) == NULL)
		return (NULL);
	TAILQ_REMOVE(&sc->mfi_cmd_tbolt_tqh, cmd, next);
	memset((uint8_t *)cmd->sg_frame, 0, MEGASAS_MAX_SZ_CHAIN_FRAME);
	memset((uint8_t *)cmd->io_request, 0,
	    MEGASAS_THUNDERBOLT_NEW_MSG_SIZE);

	cmd->sync_cmd_idx = mfi_cmd->cm_index;
	mfi_cmd->cm_extra_frames = cmd->index; /* Frame count used as SMID */
	mfi_cmd->cm_flags |= MFI_CMD_TBOLT;

	return cmd;
}

union mfi_mpi2_request_descriptor *
mfi_tbolt_get_request_descriptor(struct mfi_softc *sc, uint16_t index)
{
	uint8_t *p;

	if (index >= sc->mfi_max_fw_cmds) {
		device_printf(sc->mfi_dev, "Invalid SMID (0x%x)request "
		    "for descriptor\n", index);
		return NULL;
	}
	p = sc->request_desc_pool + sizeof(union mfi_mpi2_request_descriptor)
	    * index;
	memset(p, 0, sizeof(union mfi_mpi2_request_descriptor));
	return (union mfi_mpi2_request_descriptor *)p;
}


/* Used to build IOCTL cmd */
uint8_t
mfi_build_mpt_pass_thru(struct mfi_softc *sc, struct mfi_command *mfi_cmd)
{
	MPI25_IEEE_SGE_CHAIN64 *mpi25_ieee_chain;
	struct mfi_mpi2_request_raid_scsi_io *io_req;
	struct mfi_cmd_tbolt *cmd;

	cmd = mfi_tbolt_get_cmd(sc, mfi_cmd);
	if (!cmd)
		return EBUSY;
	io_req = cmd->io_request;
	mpi25_ieee_chain = (MPI25_IEEE_SGE_CHAIN64 *)&io_req->SGL.IeeeChain;

	io_req->Function = MPI2_FUNCTION_PASSTHRU_IO_REQUEST;
	io_req->SGLOffset0 = offsetof(struct mfi_mpi2_request_raid_scsi_io,
	    SGL) / 4;
	io_req->ChainOffset = sc->chain_offset_value_for_mpt_ptmsg;

	mpi25_ieee_chain->Address = mfi_cmd->cm_frame_busaddr;

	/*
	  In MFI pass thru, nextChainOffset will always be zero to
	  indicate the end of the chain.
	*/
	mpi25_ieee_chain->Flags= MPI2_IEEE_SGE_FLAGS_CHAIN_ELEMENT
		| MPI2_IEEE_SGE_FLAGS_IOCPLBNTA_ADDR;

	/* setting the length to the maximum length */
	mpi25_ieee_chain->Length = 1024;

	return 0;
}

void
mfi_tbolt_build_ldio(struct mfi_softc *sc, struct mfi_command *mfi_cmd,
    struct mfi_cmd_tbolt *cmd)
{
	uint32_t start_lba_lo = 0, start_lba_hi = 0, device_id;
	struct mfi_mpi2_request_raid_scsi_io	*io_request;
	struct IO_REQUEST_INFO io_info;

	device_id = mfi_cmd->cm_frame->io.header.target_id;
	io_request = cmd->io_request;
	io_request->RaidContext.TargetID = device_id;
	io_request->RaidContext.Status = 0;
	io_request->RaidContext.exStatus = 0;
	io_request->RaidContext.regLockFlags = 0;

	start_lba_lo = mfi_cmd->cm_frame->io.lba_lo;
	start_lba_hi = mfi_cmd->cm_frame->io.lba_hi;

	memset(&io_info, 0, sizeof(struct IO_REQUEST_INFO));
	io_info.ldStartBlock = ((uint64_t)start_lba_hi << 32) | start_lba_lo;
	io_info.numBlocks = mfi_cmd->cm_frame->io.header.data_len;
	io_info.ldTgtId = device_id;
	if ((mfi_cmd->cm_frame->header.flags & MFI_FRAME_DIR_READ) ==
	    MFI_FRAME_DIR_READ)
		io_info.isRead = 1;

	io_request->RaidContext.timeoutValue
		= MFI_FUSION_FP_DEFAULT_TIMEOUT;
	io_request->Function = MPI2_FUNCTION_LD_IO_REQUEST;
	io_request->DevHandle = device_id;
	cmd->request_desc->header.RequestFlags
		= (MFI_REQ_DESCRIPT_FLAGS_LD_IO
		   << MFI_REQ_DESCRIPT_FLAGS_TYPE_SHIFT);
	if ((io_request->IoFlags == 6) && (io_info.numBlocks == 0))
		io_request->RaidContext.RegLockLength = 0x100;
	io_request->DataLength = mfi_cmd->cm_frame->io.header.data_len
	    * MFI_SECTOR_LEN;
}

int
mfi_tbolt_build_io(struct mfi_softc *sc, struct mfi_command *mfi_cmd,
    struct mfi_cmd_tbolt *cmd)
{
	struct mfi_mpi2_request_raid_scsi_io *io_request;
	uint32_t sge_count;
	uint8_t cdb_len;
	int readop;
	u_int64_t lba;

	io_request = cmd->io_request;
	if (!(mfi_cmd->cm_frame->header.cmd == MFI_CMD_LD_READ
	      || mfi_cmd->cm_frame->header.cmd == MFI_CMD_LD_WRITE))
		return 1;

	mfi_tbolt_build_ldio(sc, mfi_cmd, cmd);

	/* Convert to SCSI command CDB */
	bzero(io_request->CDB.CDB32, sizeof(io_request->CDB.CDB32));
	if (mfi_cmd->cm_frame->header.cmd == MFI_CMD_LD_WRITE)
		readop = 0;
	else
		readop = 1;

	lba =  mfi_cmd->cm_frame->io.lba_hi;
	lba = (lba << 32) + mfi_cmd->cm_frame->io.lba_lo;
	cdb_len = mfi_build_cdb(readop, 0, lba,
	    mfi_cmd->cm_frame->io.header.data_len, io_request->CDB.CDB32);

	/* Just the CDB length, rest of the Flags are zero */
	io_request->IoFlags = cdb_len;

	/*
	 * Construct SGL
	 */
	sge_count = mfi_tbolt_make_sgl(sc, mfi_cmd,
	    (pMpi25IeeeSgeChain64_t) &io_request->SGL, cmd);
	if (sge_count > sc->mfi_max_sge) {
		device_printf(sc->mfi_dev, "Error. sge_count (0x%x) exceeds "
		    "max (0x%x) allowed\n", sge_count, sc->mfi_max_sge);
		return 1;
	}
	io_request->RaidContext.numSGE = sge_count;
	io_request->SGLFlags = MPI2_SGE_FLAGS_64_BIT_ADDRESSING;

	if (mfi_cmd->cm_frame->header.cmd == MFI_CMD_LD_WRITE)
		io_request->Control = MPI2_SCSIIO_CONTROL_WRITE;
	else
		io_request->Control = MPI2_SCSIIO_CONTROL_READ;

	io_request->SGLOffset0 = offsetof(
	    struct mfi_mpi2_request_raid_scsi_io, SGL)/4;

	io_request->SenseBufferLowAddress = mfi_cmd->cm_sense_busaddr;
	io_request->SenseBufferLength = MFI_SENSE_LEN;
	io_request->RaidContext.Status = MFI_STAT_INVALID_STATUS;
	io_request->RaidContext.exStatus = MFI_STAT_INVALID_STATUS;

	return 0;
}


static int
mfi_tbolt_make_sgl(struct mfi_softc *sc, struct mfi_command *mfi_cmd,
		   pMpi25IeeeSgeChain64_t sgl_ptr, struct mfi_cmd_tbolt *cmd)
{
	uint8_t i, sg_processed, sg_to_process;
	uint8_t sge_count, sge_idx;
	union mfi_sgl *os_sgl;
	pMpi25IeeeSgeChain64_t sgl_end;

	/*
	 * Return 0 if there is no data transfer
	 */
	if (!mfi_cmd->cm_sg || !mfi_cmd->cm_len) {
	 	device_printf(sc->mfi_dev, "Buffer empty \n");
		return 0;
	}
	os_sgl = mfi_cmd->cm_sg;
	sge_count = mfi_cmd->cm_frame->header.sg_count;

	if (sge_count > sc->mfi_max_sge) {
		device_printf(sc->mfi_dev, "sgl ptr %p sg_cnt %d \n",
		    os_sgl, sge_count);
		return sge_count;
	}

	if (sge_count > sc->max_SGEs_in_main_message)
		/* One element to store the chain info */
		sge_idx = sc->max_SGEs_in_main_message - 1;
	else
		sge_idx = sge_count;

	if (sc->mfi_flags & (MFI_FLAGS_INVADER | MFI_FLAGS_FURY)) {
		sgl_end = sgl_ptr + (sc->max_SGEs_in_main_message - 1);
		sgl_end->Flags = 0;
	}

	for (i = 0; i < sge_idx; i++) {
		/*
		 * For 32bit BSD we are getting 32 bit SGL's from OS
		 * but FW only take 64 bit SGL's so copying from 32 bit
		 * SGL's to 64.
		 */
		if (sc->mfi_flags & MFI_FLAGS_SKINNY) {
			sgl_ptr->Length = os_sgl->sg_skinny[i].len;
			sgl_ptr->Address = os_sgl->sg_skinny[i].addr;
		} else {
			sgl_ptr->Length = os_sgl->sg32[i].len;
			sgl_ptr->Address = os_sgl->sg32[i].addr;
		}
		if (i == sge_count - 1 &&
		    (sc->mfi_flags & (MFI_FLAGS_INVADER | MFI_FLAGS_FURY)))
			sgl_ptr->Flags = MPI25_IEEE_SGE_FLAGS_END_OF_LIST;
		else
			sgl_ptr->Flags = 0;
		sgl_ptr++;
		cmd->io_request->ChainOffset = 0;
	}

	sg_processed = i;

	if (sg_processed < sge_count) {
		pMpi25IeeeSgeChain64_t sg_chain;
		sg_to_process = sge_count - sg_processed;
		cmd->io_request->ChainOffset =
		    sc->chain_offset_value_for_main_message;
		sg_chain = sgl_ptr;
		/* Prepare chain element */
		sg_chain->NextChainOffset = 0;
		if (sc->mfi_flags & (MFI_FLAGS_INVADER | MFI_FLAGS_FURY))
			sg_chain->Flags = MPI2_IEEE_SGE_FLAGS_CHAIN_ELEMENT;
		else
			sg_chain->Flags = MPI2_IEEE_SGE_FLAGS_CHAIN_ELEMENT |
			    MPI2_IEEE_SGE_FLAGS_IOCPLBNTA_ADDR;
		sg_chain->Length =  (sizeof(MPI2_SGE_IO_UNION) *
		    (sge_count - sg_processed));
		sg_chain->Address = cmd->sg_frame_phys_addr;
		sgl_ptr = (pMpi25IeeeSgeChain64_t)cmd->sg_frame;
		for (; i < sge_count; i++) {
			if (sc->mfi_flags & MFI_FLAGS_SKINNY) {
				sgl_ptr->Length = os_sgl->sg_skinny[i].len;
				sgl_ptr->Address = os_sgl->sg_skinny[i].addr;
			} else {
				sgl_ptr->Length = os_sgl->sg32[i].len;
				sgl_ptr->Address = os_sgl->sg32[i].addr;
			}
			if (i == sge_count - 1 &&
			    (sc->mfi_flags &
			    (MFI_FLAGS_INVADER | MFI_FLAGS_FURY)))
				sgl_ptr->Flags =
				    MPI25_IEEE_SGE_FLAGS_END_OF_LIST;
			else
				sgl_ptr->Flags = 0;
			sgl_ptr++;
		}
	}
	return sge_count;
}

union mfi_mpi2_request_descriptor *
mfi_build_and_issue_cmd(struct mfi_softc *sc, struct mfi_command *mfi_cmd)
{
	struct mfi_cmd_tbolt *cmd;
	union mfi_mpi2_request_descriptor *req_desc = NULL;
	uint16_t index;
	cmd = mfi_tbolt_get_cmd(sc, mfi_cmd);
	if (cmd == NULL)
		return (NULL);

	index = cmd->index;
	req_desc = mfi_tbolt_get_request_descriptor(sc, index-1);
	if (req_desc == NULL) {
		mfi_tbolt_return_cmd(sc, cmd, mfi_cmd);
		return (NULL);
	}

	if (mfi_tbolt_build_io(sc, mfi_cmd, cmd) != 0) {
		mfi_tbolt_return_cmd(sc, cmd, mfi_cmd);
		return (NULL);
	}
	req_desc->header.SMID = index;
	return req_desc;
}

union mfi_mpi2_request_descriptor *
mfi_tbolt_build_mpt_cmd(struct mfi_softc *sc, struct mfi_command *cmd)
{
	union mfi_mpi2_request_descriptor *req_desc = NULL;
	uint16_t index;
	if (mfi_build_mpt_pass_thru(sc, cmd)) {
		device_printf(sc->mfi_dev, "Couldn't build MFI pass thru "
		    "cmd\n");
		return NULL;
	}
	/* For fusion the frame_count variable is used for SMID */
	index = cmd->cm_extra_frames;

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

	bzero(req_desc, sizeof(*req_desc));
	req_desc->header.RequestFlags = (MPI2_REQ_DESCRIPT_FLAGS_SCSI_IO <<
	    MFI_REQ_DESCRIPT_FLAGS_TYPE_SHIFT);
	req_desc->header.SMID = index;
	return req_desc;
}

int
mfi_tbolt_send_frame(struct mfi_softc *sc, struct mfi_command *cm)
{
	struct mfi_frame_header *hdr;
	uint8_t *cdb;
	union mfi_mpi2_request_descriptor *req_desc = NULL;
	int tm = mfi_polled_cmd_timeout * 1000;

	hdr = &cm->cm_frame->header;
	cdb = cm->cm_frame->pass.cdb;
	if (sc->adpreset)
		return 1;
	if ((cm->cm_flags & MFI_CMD_POLLED) == 0) {
		cm->cm_timestamp = time_uptime;
		mfi_enqueue_busy(cm);
	} else {	/* still get interrupts for it */
		hdr->cmd_status = MFI_STAT_INVALID_STATUS;
		hdr->flags |= MFI_FRAME_DONT_POST_IN_REPLY_QUEUE;
	}

	if (hdr->cmd == MFI_CMD_PD_SCSI_IO) {
		/* check for inquiry commands coming from CLI */
		if (cdb[0] != 0x28 || cdb[0] != 0x2A) {
			if ((req_desc = mfi_tbolt_build_mpt_cmd(sc, cm)) ==
			    NULL) {
				device_printf(sc->mfi_dev, "Mapping from MFI "
				    "to MPT Failed \n");
				return 1;
			}
		}
		else
			device_printf(sc->mfi_dev, "DJA NA XXX SYSPDIO\n");
	} else if (hdr->cmd == MFI_CMD_LD_SCSI_IO ||
	    hdr->cmd == MFI_CMD_LD_READ || hdr->cmd == MFI_CMD_LD_WRITE) {
		cm->cm_flags |= MFI_CMD_SCSI;
		if ((req_desc = mfi_build_and_issue_cmd(sc, cm)) == NULL) {
			device_printf(sc->mfi_dev, "LDIO Failed \n");
			return 1;
		}
	} else if ((req_desc = mfi_tbolt_build_mpt_cmd(sc, cm)) == NULL) {
		device_printf(sc->mfi_dev, "Mapping from MFI to MPT Failed\n");
		return (1);
	}

	if (cm->cm_flags & MFI_CMD_SCSI) {
		/*
		 * LD IO needs to be posted since it doesn't get
		 * acknowledged via a status update so have the
		 * controller reply via mfi_tbolt_complete_cmd.
		 */
		hdr->flags &= ~MFI_FRAME_DONT_POST_IN_REPLY_QUEUE;
	}

	MFI_WRITE4(sc, MFI_ILQP, (req_desc->words & 0xFFFFFFFF));
	MFI_WRITE4(sc, MFI_IHQP, (req_desc->words >>0x20));

	if ((cm->cm_flags & MFI_CMD_POLLED) == 0)
		return 0;

	/*
	 * This is a polled command, so busy-wait for it to complete.
	 *
	 * The value of hdr->cmd_status is updated directly by the hardware
	 * so there is no guarantee that mfi_tbolt_complete_cmd is called
	 * prior to this value changing.
	 */
	while (hdr->cmd_status == MFI_STAT_INVALID_STATUS) {
		DELAY(1000);
		tm -= 1;
		if (tm <= 0)
			break;
		if (cm->cm_flags & MFI_CMD_SCSI) {
			/*
			 * Force check reply queue.
			 * This ensures that dump works correctly
			 */
			mfi_tbolt_complete_cmd(sc);
		}
	}

	/* ensure the command cleanup has been processed before returning */
	mfi_tbolt_complete_cmd(sc);

	if (hdr->cmd_status == MFI_STAT_INVALID_STATUS) {
		device_printf(sc->mfi_dev, "Frame %p timed out "
		    "command 0x%X\n", hdr, cm->cm_frame->dcmd.opcode);
		return (ETIMEDOUT);
	}
	return 0;
}

static void
mfi_issue_pending_cmds_again(struct mfi_softc *sc)
{
	struct mfi_command *cm, *tmp;
	struct mfi_cmd_tbolt *cmd;

	mtx_assert(&sc->mfi_io_lock, MA_OWNED);
	TAILQ_FOREACH_REVERSE_SAFE(cm, &sc->mfi_busy, BUSYQ, cm_link, tmp) {

		cm->retry_for_fw_reset++;

		/*
		 * If a command has continuously been tried multiple times
		 * and causing a FW reset condition, no further recoveries
		 * should be performed on the controller
		 */
		if (cm->retry_for_fw_reset == 3) {
			device_printf(sc->mfi_dev, "megaraid_sas: command %p "
			    "index=%d was tried multiple times during adapter "
			    "reset - Shutting down the HBA\n", cm, cm->cm_index);
			mfi_kill_hba(sc);
			sc->hw_crit_error = 1;
			return;
		}

		mfi_remove_busy(cm);
		if ((cm->cm_flags & MFI_CMD_TBOLT) != 0) {
			if (cm->cm_extra_frames != 0 && cm->cm_extra_frames <=
			    sc->mfi_max_fw_cmds) {
				cmd = sc->mfi_cmd_pool_tbolt[cm->cm_extra_frames - 1];
				mfi_tbolt_return_cmd(sc, cmd, cm);
			} else {
				device_printf(sc->mfi_dev,
				    "Invalid extra_frames: %d detected\n",
				    cm->cm_extra_frames);
			}
		}

		if (cm->cm_frame->dcmd.opcode != MFI_DCMD_CTRL_EVENT_WAIT) {
			device_printf(sc->mfi_dev,
			    "APJ ****requeue command %p index=%d\n",
			    cm, cm->cm_index);
			mfi_requeue_ready(cm);
		} else
			mfi_release_command(cm);
	}
	mfi_startio(sc);
}

static void
mfi_kill_hba(struct mfi_softc *sc)
{
	if (sc->mfi_flags & MFI_FLAGS_TBOLT)
		MFI_WRITE4(sc, 0x00, MFI_STOP_ADP);
	else
		MFI_WRITE4(sc, MFI_IDB, MFI_STOP_ADP);
}

static void
mfi_process_fw_state_chg_isr(void *arg)
{
	struct mfi_softc *sc= (struct mfi_softc *)arg;
	int error, status;

	if (sc->adpreset == 1) {
		device_printf(sc->mfi_dev, "First stage of FW reset "
		     "initiated...\n");

		sc->mfi_adp_reset(sc);
		sc->mfi_enable_intr(sc);

		device_printf(sc->mfi_dev, "First stage of reset complete, "
		    "second stage initiated...\n");

		sc->adpreset = 2;

		/* waiting for about 20 second before start the second init */
		for (int wait = 0; wait < 20000; wait++)
			DELAY(1000);
		device_printf(sc->mfi_dev, "Second stage of FW reset "
		     "initiated...\n");
		while ((status = MFI_READ4(sc, MFI_RSR)) & 0x04);

		sc->mfi_disable_intr(sc);

		/* We expect the FW state to be READY */
		if (mfi_transition_firmware(sc)) {
			device_printf(sc->mfi_dev, "controller is not in "
			    "ready state\n");
			mfi_kill_hba(sc);
			sc->hw_crit_error = 1;
			return;
		}
		if ((error = mfi_tbolt_init_MFI_queue(sc)) != 0) {
			device_printf(sc->mfi_dev, "Failed to initialise MFI "
			    "queue\n");
			mfi_kill_hba(sc);
			sc->hw_crit_error = 1;
			return;
		}

		/* Init last reply index and max */
		MFI_WRITE4(sc, MFI_RFPI, sc->mfi_max_fw_cmds - 1);
		MFI_WRITE4(sc, MFI_RPI, sc->last_reply_idx);

		sc->mfi_enable_intr(sc);
		sc->adpreset = 0;
		if (sc->mfi_aen_cm != NULL) {
			free(sc->mfi_aen_cm->cm_data, M_MFIBUF);
			mfi_remove_busy(sc->mfi_aen_cm);
			mfi_release_command(sc->mfi_aen_cm);
			sc->mfi_aen_cm = NULL;
		}

		if (sc->mfi_map_sync_cm != NULL) {
			mfi_remove_busy(sc->mfi_map_sync_cm);
			mfi_release_command(sc->mfi_map_sync_cm);
			sc->mfi_map_sync_cm = NULL;
		}
		mfi_issue_pending_cmds_again(sc);

		/*
		 * Issue pending command can result in adapter being marked
		 * dead because of too many re-tries. Check for that
		 * condition before clearing the reset condition on the FW
		 */
		if (!sc->hw_crit_error) {
			/*
			 * Initiate AEN (Asynchronous Event Notification) &
			 * Sync Map
			 */
			mfi_aen_setup(sc, sc->last_seq_num);
			mfi_tbolt_sync_map_info(sc);

			sc->issuepend_done = 1;
			device_printf(sc->mfi_dev, "second stage of reset "
			    "complete, FW is ready now.\n");
		} else {
			device_printf(sc->mfi_dev, "second stage of reset "
			     "never completed, hba was marked offline.\n");
		}
	} else {
		device_printf(sc->mfi_dev, "mfi_process_fw_state_chg_isr "
		    "called with unhandled value:%d\n", sc->adpreset);
	}
}

/*
 * The ThunderBolt HW has an option for the driver to directly
 * access the underlying disks and operate on the RAID.  To
 * do this there needs to be a capability to keep the RAID controller
 * and driver in sync.  The FreeBSD driver does not take advantage
 * of this feature since it adds a lot of complexity and slows down
 * performance.  Performance is gained by using the controller's
 * cache etc.
 *
 * Even though this driver doesn't access the disks directly, an
 * AEN like command is used to inform the RAID firmware to "sync"
 * with all LD's via the MFI_DCMD_LD_MAP_GET_INFO command.  This
 * command in write mode will return when the RAID firmware has
 * detected a change to the RAID state.  Examples of this type
 * of change are removing a disk.  Once the command returns then
 * the driver needs to acknowledge this and "sync" all LD's again.
 * This repeats until we shutdown.  Then we need to cancel this
 * pending command.
 *
 * If this is not done right the RAID firmware will not remove a
 * pulled drive and the RAID won't go degraded etc.  Effectively,
 * stopping any RAID mangement to functions.
 *
 * Doing another LD sync, requires the use of an event since the
 * driver needs to do a mfi_wait_command and can't do that in an
 * interrupt thread.
 *
 * The driver could get the RAID state via the MFI_DCMD_LD_MAP_GET_INFO
 * That requires a bunch of structure and it is simpler to just do
 * the MFI_DCMD_LD_GET_LIST versus walking the RAID map.
 */

void
mfi_tbolt_sync_map_info(struct mfi_softc *sc)
{
	int error = 0, i;
	struct mfi_command *cmd = NULL;
	struct mfi_dcmd_frame *dcmd = NULL;
	uint32_t context = 0;
	union mfi_ld_ref *ld_sync = NULL;
	size_t ld_size;
	struct mfi_frame_header *hdr;
	struct mfi_command *cm = NULL;
	struct mfi_ld_list *list = NULL;

	mtx_assert(&sc->mfi_io_lock, MA_OWNED);

	if (sc->mfi_map_sync_cm != NULL || sc->cm_map_abort)
		return;

	error = mfi_dcmd_command(sc, &cm, MFI_DCMD_LD_GET_LIST,
	    (void **)&list, sizeof(*list));
	if (error)
		goto out;

	cm->cm_flags = MFI_CMD_POLLED | MFI_CMD_DATAIN;

	if (mfi_wait_command(sc, cm) != 0) {
		device_printf(sc->mfi_dev, "Failed to get device listing\n");
		goto out;
	}

	hdr = &cm->cm_frame->header;
	if (hdr->cmd_status != MFI_STAT_OK) {
		device_printf(sc->mfi_dev, "MFI_DCMD_LD_GET_LIST failed %x\n",
			      hdr->cmd_status);
		goto out;
	}

	ld_size = sizeof(*ld_sync) * list->ld_count;
	ld_sync = (union mfi_ld_ref *) malloc(ld_size, M_MFIBUF,
	     M_NOWAIT | M_ZERO);
	if (ld_sync == NULL) {
		device_printf(sc->mfi_dev, "Failed to allocate sync\n");
		goto out;
	}
	for (i = 0; i < list->ld_count; i++)
		ld_sync[i].ref = list->ld_list[i].ld.ref;

	if ((cmd = mfi_dequeue_free(sc)) == NULL) {
		device_printf(sc->mfi_dev, "Failed to get command\n");
		free(ld_sync, M_MFIBUF);
		goto out;
	}

	context = cmd->cm_frame->header.context;
	bzero(cmd->cm_frame, sizeof(union mfi_frame));
	cmd->cm_frame->header.context = context;

	dcmd = &cmd->cm_frame->dcmd;
	bzero(dcmd->mbox, MFI_MBOX_SIZE);
	dcmd->header.cmd = MFI_CMD_DCMD;
	dcmd->header.flags = MFI_FRAME_DIR_WRITE;
	dcmd->header.timeout = 0;
	dcmd->header.data_len = ld_size;
	dcmd->header.scsi_status = 0;
	dcmd->opcode = MFI_DCMD_LD_MAP_GET_INFO;
	cmd->cm_sg = &dcmd->sgl;
	cmd->cm_total_frame_size = MFI_DCMD_FRAME_SIZE;
	cmd->cm_data = ld_sync;
	cmd->cm_private = ld_sync;

	cmd->cm_len = ld_size;
	cmd->cm_complete = mfi_sync_map_complete;
	sc->mfi_map_sync_cm = cmd;

	cmd->cm_flags = MFI_CMD_DATAOUT;
	cmd->cm_frame->dcmd.mbox[0] = list->ld_count;
	cmd->cm_frame->dcmd.mbox[1] = MFI_DCMD_MBOX_PEND_FLAG;

	if ((error = mfi_mapcmd(sc, cmd)) != 0) {
		device_printf(sc->mfi_dev, "failed to send map sync\n");
		free(ld_sync, M_MFIBUF);
		sc->mfi_map_sync_cm = NULL;
		mfi_release_command(cmd);
		goto out;
	}

out:
	if (list)
		free(list, M_MFIBUF);
	if (cm)
		mfi_release_command(cm);
}

static void
mfi_sync_map_complete(struct mfi_command *cm)
{
	struct mfi_frame_header *hdr;
	struct mfi_softc *sc;
	int aborted = 0;

	sc = cm->cm_sc;
	mtx_assert(&sc->mfi_io_lock, MA_OWNED);

	hdr = &cm->cm_frame->header;

	if (sc->mfi_map_sync_cm == NULL)
		return;

	if (sc->cm_map_abort ||
	    hdr->cmd_status == MFI_STAT_INVALID_STATUS) {
		sc->cm_map_abort = 0;
		aborted = 1;
	}

	free(cm->cm_data, M_MFIBUF);
	wakeup(&sc->mfi_map_sync_cm);
	sc->mfi_map_sync_cm = NULL;
	mfi_release_command(cm);

	/* set it up again so the driver can catch more events */
	if (!aborted)
		mfi_queue_map_sync(sc);
}

static void
mfi_queue_map_sync(struct mfi_softc *sc)
{
	mtx_assert(&sc->mfi_io_lock, MA_OWNED);
	taskqueue_enqueue(taskqueue_swi, &sc->mfi_map_sync_task);
}

void
mfi_handle_map_sync(void *context, int pending)
{
	struct mfi_softc *sc;

	sc = context;
	mtx_lock(&sc->mfi_io_lock);
	mfi_tbolt_sync_map_info(sc);
	mtx_unlock(&sc->mfi_io_lock);
}