/*
 *  Linux MegaRAID driver for SAS based RAID controllers
 *
 *  Copyright (c) 2009-2013  LSI Corporation
 *  Copyright (c) 2013-2014  Avago Technologies
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *  FILE: megaraid_sas_fusion.c
 *
 *  Authors: Avago Technologies
 *           Sumant Patro
 *           Adam Radford
 *           Kashyap Desai <kashyap.desai@avagotech.com>
 *           Sumit Saxena <sumit.saxena@avagotech.com>
 *
 *  Send feedback to: megaraidlinux.pdl@avagotech.com
 *
 *  Mail to: Avago Technologies, 350 West Trimble Road, Building 90,
 *  San Jose, California 95131
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/list.h>
#include <linux/moduleparam.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/uio.h>
#include <linux/uaccess.h>
#include <linux/fs.h>
#include <linux/compat.h>
#include <linux/blkdev.h>
#include <linux/mutex.h>
#include <linux/poll.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_dbg.h>
#include <linux/dmi.h>

#include "megaraid_sas_fusion.h"
#include "megaraid_sas.h"


extern void megasas_free_cmds(struct megasas_instance *instance);
extern struct megasas_cmd *megasas_get_cmd(struct megasas_instance
                                           *instance);
extern void
megasas_complete_cmd(struct megasas_instance *instance,
                     struct megasas_cmd *cmd, u8 alt_status);
int
wait_and_poll(struct megasas_instance *instance, struct megasas_cmd *cmd,
              int seconds);

void
megasas_return_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd);
int megasas_alloc_cmds(struct megasas_instance *instance);
int
megasas_clear_intr_fusion(struct megasas_register_set __iomem *regs);
int
megasas_issue_polled(struct megasas_instance *instance,
                     struct megasas_cmd *cmd);
void
megasas_check_and_restore_queue_depth(struct megasas_instance *instance);

int megasas_transition_to_ready(struct megasas_instance *instance, int ocr);
void megaraid_sas_kill_hba(struct megasas_instance *instance);

extern u32 megasas_dbg_lvl;
void megasas_sriov_heartbeat_handler(unsigned long instance_addr);
int megasas_sriov_start_heartbeat(struct megasas_instance *instance,
                                  int initial);
void megasas_start_timer(struct megasas_instance *instance,
                        struct timer_list *timer,
                         void *fn, unsigned long interval);
extern struct megasas_mgmt_info megasas_mgmt_info;
extern unsigned int resetwaittime;
extern unsigned int dual_qdepth_disable;
static void megasas_free_rdpq_fusion(struct megasas_instance *instance);
static void megasas_free_reply_fusion(struct megasas_instance *instance);



/**
 * megasas_enable_intr_fusion - Enables interrupts
 * @regs:                       MFI register set
 */
void
megasas_enable_intr_fusion(struct megasas_instance *instance)
{
        struct megasas_register_set __iomem *regs;
        regs = instance->reg_set;

        instance->mask_interrupts = 0;
        /* For Thunderbolt/Invader also clear intr on enable */
        writel(~0, &regs->outbound_intr_status);
        readl(&regs->outbound_intr_status);

        writel(~MFI_FUSION_ENABLE_INTERRUPT_MASK, &(regs)->outbound_intr_mask);

        /* Dummy readl to force pci flush */
        readl(&regs->outbound_intr_mask);
}

/**
 * megasas_disable_intr_fusion - Disables interrupt
 * @regs:                        MFI register set
 */
void
megasas_disable_intr_fusion(struct megasas_instance *instance)
{
        u32 mask = 0xFFFFFFFF;
        u32 status;
        struct megasas_register_set __iomem *regs;
        regs = instance->reg_set;
        instance->mask_interrupts = 1;

        writel(mask, &regs->outbound_intr_mask);
        /* Dummy readl to force pci flush */
        status = readl(&regs->outbound_intr_mask);
}

int
megasas_clear_intr_fusion(struct megasas_register_set __iomem *regs)
{
        u32 status;
        /*
         * Check if it is our interrupt
         */
        status = readl(&regs->outbound_intr_status);

        if (status & 1) {
                writel(status, &regs->outbound_intr_status);
                readl(&regs->outbound_intr_status);
                return 1;
        }
        if (!(status & MFI_FUSION_ENABLE_INTERRUPT_MASK))
                return 0;

        return 1;
}

/**
 * megasas_get_cmd_fusion -     Get a command from the free pool
 * @instance:           Adapter soft state
 *
 * Returns a blk_tag indexed mpt frame
 */
inline struct megasas_cmd_fusion *megasas_get_cmd_fusion(struct megasas_instance
                                                  *instance, u32 blk_tag)
{
        struct fusion_context *fusion;

        fusion = instance->ctrl_context;
        return fusion->cmd_list[blk_tag];
}

/**
 * megasas_return_cmd_fusion -  Return a cmd to free command pool
 * @instance:           Adapter soft state
 * @cmd:                Command packet to be returned to free command pool
 */
inline void megasas_return_cmd_fusion(struct megasas_instance *instance,
        struct megasas_cmd_fusion *cmd)
{
        cmd->scmd = NULL;
        memset(cmd->io_request, 0, sizeof(struct MPI2_RAID_SCSI_IO_REQUEST));
}

/**
 * megasas_fire_cmd_fusion -    Sends command to the FW
 */
static void
megasas_fire_cmd_fusion(struct megasas_instance *instance,
                union MEGASAS_REQUEST_DESCRIPTOR_UNION *req_desc)
{
#if defined(writeq) && defined(CONFIG_64BIT)
        u64 req_data = (((u64)le32_to_cpu(req_desc->u.high) << 32) |
                        le32_to_cpu(req_desc->u.low));

        writeq(req_data, &instance->reg_set->inbound_low_queue_port);
#else
        unsigned long flags;

        spin_lock_irqsave(&instance->hba_lock, flags);
        writel(le32_to_cpu(req_desc->u.low),
                &instance->reg_set->inbound_low_queue_port);
        writel(le32_to_cpu(req_desc->u.high),
                &instance->reg_set->inbound_high_queue_port);
        mmiowb();
        spin_unlock_irqrestore(&instance->hba_lock, flags);
#endif
}

/**
 * megasas_fusion_update_can_queue -    Do all Adapter Queue depth related calculations here
 * @instance:                                                   Adapter soft state
 * fw_boot_context:                                             Whether this function called during probe or after OCR
 *
 * This function is only for fusion controllers.
 * Update host can queue, if firmware downgrade max supported firmware commands.
 * Firmware upgrade case will be skiped because underlying firmware has
 * more resource than exposed to the OS.
 *
 */
static void
megasas_fusion_update_can_queue(struct megasas_instance *instance, int fw_boot_context)
{
        u16 cur_max_fw_cmds = 0;
        u16 ldio_threshold = 0;
        struct megasas_register_set __iomem *reg_set;

        reg_set = instance->reg_set;

        cur_max_fw_cmds = readl(&instance->reg_set->outbound_scratch_pad_3) & 0x00FFFF;

        if (dual_qdepth_disable || !cur_max_fw_cmds)
                cur_max_fw_cmds = instance->instancet->read_fw_status_reg(reg_set) & 0x00FFFF;
        else
                ldio_threshold =
                        (instance->instancet->read_fw_status_reg(reg_set) & 0x00FFFF) - MEGASAS_FUSION_IOCTL_CMDS;

        dev_info(&instance->pdev->dev,
                        "Current firmware maximum commands: %d\t LDIO threshold: %d\n",
                        cur_max_fw_cmds, ldio_threshold);

        if (fw_boot_context == OCR_CONTEXT) {
                cur_max_fw_cmds = cur_max_fw_cmds - 1;
                if (cur_max_fw_cmds <= instance->max_fw_cmds) {
                        instance->cur_can_queue =
                                cur_max_fw_cmds - (MEGASAS_FUSION_INTERNAL_CMDS +
                                                MEGASAS_FUSION_IOCTL_CMDS);
                        instance->host->can_queue = instance->cur_can_queue;
                        instance->ldio_threshold = ldio_threshold;
                }
        } else {
                instance->max_fw_cmds = cur_max_fw_cmds;
                instance->ldio_threshold = ldio_threshold;

                if (!instance->is_rdpq)
                        instance->max_fw_cmds = min_t(u16, instance->max_fw_cmds, 1024);

                if (reset_devices)
                        instance->max_fw_cmds = min(instance->max_fw_cmds,
                                                (u16)MEGASAS_KDUMP_QUEUE_DEPTH);
                /*
                * Reduce the max supported cmds by 1. This is to ensure that the
                * reply_q_sz (1 more than the max cmd that driver may send)
                * does not exceed max cmds that the FW can support
                */
                instance->max_fw_cmds = instance->max_fw_cmds-1;

                instance->max_scsi_cmds = instance->max_fw_cmds -
                                (MEGASAS_FUSION_INTERNAL_CMDS +
                                MEGASAS_FUSION_IOCTL_CMDS);
                instance->cur_can_queue = instance->max_scsi_cmds;
        }
}
/**
 * megasas_free_cmds_fusion -   Free all the cmds in the free cmd pool
 * @instance:           Adapter soft state
 */
void
megasas_free_cmds_fusion(struct megasas_instance *instance)
{
        int i;
        struct fusion_context *fusion = instance->ctrl_context;
        struct megasas_cmd_fusion *cmd;

        /* SG, Sense */
        for (i = 0; i < instance->max_fw_cmds; i++) {
                cmd = fusion->cmd_list[i];
                if (cmd) {
                        if (cmd->sg_frame)
                                pci_pool_free(fusion->sg_dma_pool, cmd->sg_frame,
                                      cmd->sg_frame_phys_addr);
                        if (cmd->sense)
                                pci_pool_free(fusion->sense_dma_pool, cmd->sense,
                                      cmd->sense_phys_addr);
                }
        }

        if (fusion->sg_dma_pool) {
                pci_pool_destroy(fusion->sg_dma_pool);
                fusion->sg_dma_pool = NULL;
        }
        if (fusion->sense_dma_pool) {
                pci_pool_destroy(fusion->sense_dma_pool);
                fusion->sense_dma_pool = NULL;
        }


        /* Reply Frame, Desc*/
        if (instance->is_rdpq)
                megasas_free_rdpq_fusion(instance);
        else
                megasas_free_reply_fusion(instance);

        /* Request Frame, Desc*/
        if (fusion->req_frames_desc)
                dma_free_coherent(&instance->pdev->dev,
                        fusion->request_alloc_sz, fusion->req_frames_desc,
                        fusion->req_frames_desc_phys);
        if (fusion->io_request_frames)
                pci_pool_free(fusion->io_request_frames_pool,
                        fusion->io_request_frames,
                        fusion->io_request_frames_phys);
        if (fusion->io_request_frames_pool) {
                pci_pool_destroy(fusion->io_request_frames_pool);
                fusion->io_request_frames_pool = NULL;
        }


        /* cmd_list */
        for (i = 0; i < instance->max_fw_cmds; i++)
                kfree(fusion->cmd_list[i]);

        kfree(fusion->cmd_list);
}

/**
 * megasas_create_sg_sense_fusion -     Creates DMA pool for cmd frames
 * @instance:                   Adapter soft state
 *
 */
static int megasas_create_sg_sense_fusion(struct megasas_instance *instance)
{
        int i;
        u32 max_cmd;
        struct fusion_context *fusion;
        struct megasas_cmd_fusion *cmd;

        fusion = instance->ctrl_context;
        max_cmd = instance->max_fw_cmds;


        fusion->sg_dma_pool =
                        pci_pool_create("mr_sg", instance->pdev,
                                instance->max_chain_frame_sz, 4, 0);
        /* SCSI_SENSE_BUFFERSIZE  = 96 bytes */
        fusion->sense_dma_pool =
                        pci_pool_create("mr_sense", instance->pdev,
                                SCSI_SENSE_BUFFERSIZE, 64, 0);

        if (!fusion->sense_dma_pool || !fusion->sg_dma_pool) {
                dev_err(&instance->pdev->dev,
                        "Failed from %s %d\n",  __func__, __LINE__);
                return -ENOMEM;
        }

        /*
         * Allocate and attach a frame to each of the commands in cmd_list
         */
        for (i = 0; i < max_cmd; i++) {
                cmd = fusion->cmd_list[i];
                cmd->sg_frame = pci_pool_alloc(fusion->sg_dma_pool,
                                        GFP_KERNEL, &cmd->sg_frame_phys_addr);

                cmd->sense = pci_pool_alloc(fusion->sense_dma_pool,
                                        GFP_KERNEL, &cmd->sense_phys_addr);
                if (!cmd->sg_frame || !cmd->sense) {
                        dev_err(&instance->pdev->dev,
                                "Failed from %s %d\n",  __func__, __LINE__);
                        return -ENOMEM;
                }
        }
        return 0;
}

int
megasas_alloc_cmdlist_fusion(struct megasas_instance *instance)
{
        u32 max_cmd, i;
        struct fusion_context *fusion;

        fusion = instance->ctrl_context;

        max_cmd = instance->max_fw_cmds;

        /*
         * fusion->cmd_list is an array of struct megasas_cmd_fusion pointers.
         * Allocate the dynamic array first and then allocate individual
         * commands.
         */
        fusion->cmd_list = kzalloc(sizeof(struct megasas_cmd_fusion *) * max_cmd,
                                                GFP_KERNEL);
        if (!fusion->cmd_list) {
                dev_err(&instance->pdev->dev,
                        "Failed from %s %d\n",  __func__, __LINE__);
                return -ENOMEM;
        }

        for (i = 0; i < max_cmd; i++) {
                fusion->cmd_list[i] = kzalloc(sizeof(struct megasas_cmd_fusion),
                                              GFP_KERNEL);
                if (!fusion->cmd_list[i]) {
                        dev_err(&instance->pdev->dev,
                                "Failed from %s %d\n",  __func__, __LINE__);
                        return -ENOMEM;
                }
        }
        return 0;
}
int
megasas_alloc_request_fusion(struct megasas_instance *instance)
{
        struct fusion_context *fusion;

        fusion = instance->ctrl_context;

        fusion->req_frames_desc =
                dma_alloc_coherent(&instance->pdev->dev,
                        fusion->request_alloc_sz,
                        &fusion->req_frames_desc_phys, GFP_KERNEL);
        if (!fusion->req_frames_desc) {
                dev_err(&instance->pdev->dev,
                        "Failed from %s %d\n",  __func__, __LINE__);
                return -ENOMEM;
        }

        fusion->io_request_frames_pool =
                        pci_pool_create("mr_ioreq", instance->pdev,
                                fusion->io_frames_alloc_sz, 16, 0);

        if (!fusion->io_request_frames_pool) {
                dev_err(&instance->pdev->dev,
                        "Failed from %s %d\n",  __func__, __LINE__);
                return -ENOMEM;
        }

        fusion->io_request_frames =
                        pci_pool_alloc(fusion->io_request_frames_pool,
                                GFP_KERNEL, &fusion->io_request_frames_phys);
        if (!fusion->io_request_frames) {
                dev_err(&instance->pdev->dev,
                        "Failed from %s %d\n",  __func__, __LINE__);
                return -ENOMEM;
        }
        return 0;
}

int
megasas_alloc_reply_fusion(struct megasas_instance *instance)
{
        int i, count;
        struct fusion_context *fusion;
        union MPI2_REPLY_DESCRIPTORS_UNION *reply_desc;
        fusion = instance->ctrl_context;

        count = instance->msix_vectors > 0 ? instance->msix_vectors : 1;
        fusion->reply_frames_desc_pool =
                        pci_pool_create("mr_reply", instance->pdev,
                                fusion->reply_alloc_sz * count, 16, 0);

        if (!fusion->reply_frames_desc_pool) {
                dev_err(&instance->pdev->dev,
                        "Failed from %s %d\n",  __func__, __LINE__);
                return -ENOMEM;
        }

        fusion->reply_frames_desc[0] =
                pci_pool_alloc(fusion->reply_frames_desc_pool,
                        GFP_KERNEL, &fusion->reply_frames_desc_phys[0]);
        if (!fusion->reply_frames_desc[0]) {
                dev_err(&instance->pdev->dev,
                        "Failed from %s %d\n",  __func__, __LINE__);
                return -ENOMEM;
        }
        reply_desc = fusion->reply_frames_desc[0];
        for (i = 0; i < fusion->reply_q_depth * count; i++, reply_desc++)
                reply_desc->Words = cpu_to_le64(ULLONG_MAX);

        /* This is not a rdpq mode, but driver still populate
         * reply_frame_desc array to use same msix index in ISR path.
         */
        for (i = 0; i < (count - 1); i++)
                fusion->reply_frames_desc[i + 1] =
                        fusion->reply_frames_desc[i] +
                        (fusion->reply_alloc_sz)/sizeof(union MPI2_REPLY_DESCRIPTORS_UNION);

        return 0;
}

int
megasas_alloc_rdpq_fusion(struct megasas_instance *instance)
{
        int i, j, count;
        struct fusion_context *fusion;
        union MPI2_REPLY_DESCRIPTORS_UNION *reply_desc;

        fusion = instance->ctrl_context;

        fusion->rdpq_virt = pci_alloc_consistent(instance->pdev,
                                sizeof(struct MPI2_IOC_INIT_RDPQ_ARRAY_ENTRY) * MAX_MSIX_QUEUES_FUSION,
                                &fusion->rdpq_phys);
        if (!fusion->rdpq_virt) {
                dev_err(&instance->pdev->dev,
                        "Failed from %s %d\n",  __func__, __LINE__);
                return -ENOMEM;
        }

        memset(fusion->rdpq_virt, 0,
                        sizeof(struct MPI2_IOC_INIT_RDPQ_ARRAY_ENTRY) * MAX_MSIX_QUEUES_FUSION);
        count = instance->msix_vectors > 0 ? instance->msix_vectors : 1;
        fusion->reply_frames_desc_pool = pci_pool_create("mr_rdpq",
                                                         instance->pdev, fusion->reply_alloc_sz, 16, 0);

        if (!fusion->reply_frames_desc_pool) {
                dev_err(&instance->pdev->dev,
                        "Failed from %s %d\n",  __func__, __LINE__);
                return -ENOMEM;
        }

        for (i = 0; i < count; i++) {
                fusion->reply_frames_desc[i] =
                                pci_pool_alloc(fusion->reply_frames_desc_pool,
                                        GFP_KERNEL, &fusion->reply_frames_desc_phys[i]);
                if (!fusion->reply_frames_desc[i]) {
                        dev_err(&instance->pdev->dev,
                                "Failed from %s %d\n",  __func__, __LINE__);
                        return -ENOMEM;
                }

                fusion->rdpq_virt[i].RDPQBaseAddress =
                        fusion->reply_frames_desc_phys[i];

                reply_desc = fusion->reply_frames_desc[i];
                for (j = 0; j < fusion->reply_q_depth; j++, reply_desc++)
                        reply_desc->Words = cpu_to_le64(ULLONG_MAX);
        }
        return 0;
}

static void
megasas_free_rdpq_fusion(struct megasas_instance *instance) {

        int i;
        struct fusion_context *fusion;

        fusion = instance->ctrl_context;

        for (i = 0; i < MAX_MSIX_QUEUES_FUSION; i++) {
                if (fusion->reply_frames_desc[i])
                        pci_pool_free(fusion->reply_frames_desc_pool,
                                fusion->reply_frames_desc[i],
                                fusion->reply_frames_desc_phys[i]);
        }

        if (fusion->reply_frames_desc_pool)
                pci_pool_destroy(fusion->reply_frames_desc_pool);

        if (fusion->rdpq_virt)
                pci_free_consistent(instance->pdev,
                        sizeof(struct MPI2_IOC_INIT_RDPQ_ARRAY_ENTRY) * MAX_MSIX_QUEUES_FUSION,
                        fusion->rdpq_virt, fusion->rdpq_phys);
}

static void
megasas_free_reply_fusion(struct megasas_instance *instance) {

        struct fusion_context *fusion;

        fusion = instance->ctrl_context;

        if (fusion->reply_frames_desc[0])
                pci_pool_free(fusion->reply_frames_desc_pool,
                        fusion->reply_frames_desc[0],
                        fusion->reply_frames_desc_phys[0]);

        if (fusion->reply_frames_desc_pool)
                pci_pool_destroy(fusion->reply_frames_desc_pool);

}


/**
 * megasas_alloc_cmds_fusion -  Allocates the command packets
 * @instance:           Adapter soft state
 *
 *
 * Each frame has a 32-bit field called context. This context is used to get
 * back the megasas_cmd_fusion from the frame when a frame gets completed
 * In this driver, the 32 bit values are the indices into an array cmd_list.
 * This array is used only to look up the megasas_cmd_fusion given the context.
 * The free commands themselves are maintained in a linked list called cmd_pool.
 *
 * cmds are formed in the io_request and sg_frame members of the
 * megasas_cmd_fusion. The context field is used to get a request descriptor
 * and is used as SMID of the cmd.
 * SMID value range is from 1 to max_fw_cmds.
 */
int
megasas_alloc_cmds_fusion(struct megasas_instance *instance)
{
        int i;
        struct fusion_context *fusion;
        struct megasas_cmd_fusion *cmd;
        u32 offset;
        dma_addr_t io_req_base_phys;
        u8 *io_req_base;


        fusion = instance->ctrl_context;

        if (megasas_alloc_cmdlist_fusion(instance))
                goto fail_exit;

        if (megasas_alloc_request_fusion(instance))
                goto fail_exit;

        if (instance->is_rdpq) {
                if (megasas_alloc_rdpq_fusion(instance))
                        goto fail_exit;
        } else
                if (megasas_alloc_reply_fusion(instance))
                        goto fail_exit;


        /* The first 256 bytes (SMID 0) is not used. Don't add to the cmd list */
        io_req_base = fusion->io_request_frames + MEGA_MPI2_RAID_DEFAULT_IO_FRAME_SIZE;
        io_req_base_phys = fusion->io_request_frames_phys + MEGA_MPI2_RAID_DEFAULT_IO_FRAME_SIZE;

        /*
         * Add all the commands to command pool (fusion->cmd_pool)
         */

        /* SMID 0 is reserved. Set SMID/index from 1 */
        for (i = 0; i < instance->max_fw_cmds; i++) {
                cmd = fusion->cmd_list[i];
                offset = MEGA_MPI2_RAID_DEFAULT_IO_FRAME_SIZE * i;
                memset(cmd, 0, sizeof(struct megasas_cmd_fusion));
                cmd->index = i + 1;
                cmd->scmd = NULL;
                cmd->sync_cmd_idx = (i >= instance->max_scsi_cmds) ?
                                (i - instance->max_scsi_cmds) :
                                (u32)ULONG_MAX; /* Set to Invalid */
                cmd->instance = instance;
                cmd->io_request =
                        (struct MPI2_RAID_SCSI_IO_REQUEST *)
                  (io_req_base + offset);
                memset(cmd->io_request, 0,
                       sizeof(struct MPI2_RAID_SCSI_IO_REQUEST));
                cmd->io_request_phys_addr = io_req_base_phys + offset;
        }

        if (megasas_create_sg_sense_fusion(instance))
                goto fail_exit;

        return 0;

fail_exit:
        megasas_free_cmds_fusion(instance);
        return -ENOMEM;
}

/**
 * wait_and_poll -      Issues a polling command
 * @instance:                   Adapter soft state
 * @cmd:                        Command packet to be issued
 *
 * For polling, MFI requires the cmd_status to be set to 0xFF before posting.
 */
int
wait_and_poll(struct megasas_instance *instance, struct megasas_cmd *cmd,
        int seconds)
{
        int i;
        struct megasas_header *frame_hdr = &cmd->frame->hdr;
        struct fusion_context *fusion;

        u32 msecs = seconds * 1000;

        fusion = instance->ctrl_context;
        /*
         * Wait for cmd_status to change
         */
        for (i = 0; (i < msecs) && (frame_hdr->cmd_status == 0xff); i += 20) {
                rmb();
                msleep(20);
        }

        if (frame_hdr->cmd_status == MFI_STAT_INVALID_STATUS)
                return DCMD_TIMEOUT;
        else if (frame_hdr->cmd_status == MFI_STAT_OK)
                return DCMD_SUCCESS;
        else
                return DCMD_FAILED;
}

/**
 * megasas_ioc_init_fusion -    Initializes the FW
 * @instance:           Adapter soft state
 *
 * Issues the IOC Init cmd
 */
int
megasas_ioc_init_fusion(struct megasas_instance *instance)
{
        struct megasas_init_frame *init_frame;
        struct MPI2_IOC_INIT_REQUEST *IOCInitMessage = NULL;
        dma_addr_t      ioc_init_handle;
        struct megasas_cmd *cmd;
        u8 ret, cur_rdpq_mode;
        struct fusion_context *fusion;
        union MEGASAS_REQUEST_DESCRIPTOR_UNION req_desc;
        int i;
        struct megasas_header *frame_hdr;
        const char *sys_info;
        MFI_CAPABILITIES *drv_ops;
        u32 scratch_pad_2;

        fusion = instance->ctrl_context;

        cmd = megasas_get_cmd(instance);

        if (!cmd) {
                dev_err(&instance->pdev->dev, "Could not allocate cmd for INIT Frame\n");
                ret = 1;
                goto fail_get_cmd;
        }

        scratch_pad_2 = readl
                (&instance->reg_set->outbound_scratch_pad_2);

        cur_rdpq_mode = (scratch_pad_2 & MR_RDPQ_MODE_OFFSET) ? 1 : 0;

        if (instance->is_rdpq && !cur_rdpq_mode) {
                dev_err(&instance->pdev->dev, "Firmware downgrade *NOT SUPPORTED*"
                        " from RDPQ mode to non RDPQ mode\n");
                ret = 1;
                goto fail_fw_init;
        }

        IOCInitMessage =
          dma_alloc_coherent(&instance->pdev->dev,
                             sizeof(struct MPI2_IOC_INIT_REQUEST),
                             &ioc_init_handle, GFP_KERNEL);

        if (!IOCInitMessage) {
                dev_err(&instance->pdev->dev, "Could not allocate memory for "
                       "IOCInitMessage\n");
                ret = 1;
                goto fail_fw_init;
        }

        memset(IOCInitMessage, 0, sizeof(struct MPI2_IOC_INIT_REQUEST));

        IOCInitMessage->Function = MPI2_FUNCTION_IOC_INIT;
        IOCInitMessage->WhoInit = MPI2_WHOINIT_HOST_DRIVER;
        IOCInitMessage->MsgVersion = cpu_to_le16(MPI2_VERSION);
        IOCInitMessage->HeaderVersion = cpu_to_le16(MPI2_HEADER_VERSION);
        IOCInitMessage->SystemRequestFrameSize = cpu_to_le16(MEGA_MPI2_RAID_DEFAULT_IO_FRAME_SIZE / 4);

        IOCInitMessage->ReplyDescriptorPostQueueDepth = cpu_to_le16(fusion->reply_q_depth);
        IOCInitMessage->ReplyDescriptorPostQueueAddress = instance->is_rdpq ?
                        cpu_to_le64(fusion->rdpq_phys) :
                        cpu_to_le64(fusion->reply_frames_desc_phys[0]);
        IOCInitMessage->MsgFlags = instance->is_rdpq ?
                        MPI2_IOCINIT_MSGFLAG_RDPQ_ARRAY_MODE : 0;
        IOCInitMessage->SystemRequestFrameBaseAddress = cpu_to_le64(fusion->io_request_frames_phys);
        IOCInitMessage->HostMSIxVectors = instance->msix_vectors;
        init_frame = (struct megasas_init_frame *)cmd->frame;
        memset(init_frame, 0, MEGAMFI_FRAME_SIZE);

        frame_hdr = &cmd->frame->hdr;
        frame_hdr->cmd_status = 0xFF;
        frame_hdr->flags = cpu_to_le16(
                le16_to_cpu(frame_hdr->flags) |
                MFI_FRAME_DONT_POST_IN_REPLY_QUEUE);

        init_frame->cmd = MFI_CMD_INIT;
        init_frame->cmd_status = 0xFF;

        drv_ops = (MFI_CAPABILITIES *) &(init_frame->driver_operations);

        /* driver support Extended MSIX */
        if (fusion->adapter_type == INVADER_SERIES)
                drv_ops->mfi_capabilities.support_additional_msix = 1;
        /* driver supports HA / Remote LUN over Fast Path interface */
        drv_ops->mfi_capabilities.support_fp_remote_lun = 1;

        drv_ops->mfi_capabilities.support_max_255lds = 1;
        drv_ops->mfi_capabilities.support_ndrive_r1_lb = 1;
        drv_ops->mfi_capabilities.security_protocol_cmds_fw = 1;

        if (instance->max_chain_frame_sz > MEGASAS_CHAIN_FRAME_SZ_MIN)
                drv_ops->mfi_capabilities.support_ext_io_size = 1;

        drv_ops->mfi_capabilities.support_fp_rlbypass = 1;
        if (!dual_qdepth_disable)
                drv_ops->mfi_capabilities.support_ext_queue_depth = 1;

        drv_ops->mfi_capabilities.support_qd_throttling = 1;
        /* Convert capability to LE32 */
        cpu_to_le32s((u32 *)&init_frame->driver_operations.mfi_capabilities);

        sys_info = dmi_get_system_info(DMI_PRODUCT_UUID);
        if (instance->system_info_buf && sys_info) {
                memcpy(instance->system_info_buf->systemId, sys_info,
                        strlen(sys_info) > 64 ? 64 : strlen(sys_info));
                instance->system_info_buf->systemIdLength =
                        strlen(sys_info) > 64 ? 64 : strlen(sys_info);
                init_frame->system_info_lo = instance->system_info_h;
                init_frame->system_info_hi = 0;
        }

        init_frame->queue_info_new_phys_addr_hi =
                cpu_to_le32(upper_32_bits(ioc_init_handle));
        init_frame->queue_info_new_phys_addr_lo =
                cpu_to_le32(lower_32_bits(ioc_init_handle));
        init_frame->data_xfer_len = cpu_to_le32(sizeof(struct MPI2_IOC_INIT_REQUEST));

        req_desc.u.low = cpu_to_le32(lower_32_bits(cmd->frame_phys_addr));
        req_desc.u.high = cpu_to_le32(upper_32_bits(cmd->frame_phys_addr));
        req_desc.MFAIo.RequestFlags =
                (MEGASAS_REQ_DESCRIPT_FLAGS_MFA <<
                MEGASAS_REQ_DESCRIPT_FLAGS_TYPE_SHIFT);

        /*
         * disable the intr before firing the init frame
         */
        instance->instancet->disable_intr(instance);

        for (i = 0; i < (10 * 1000); i += 20) {
                if (readl(&instance->reg_set->doorbell) & 1)
                        msleep(20);
                else
                        break;
        }

        megasas_fire_cmd_fusion(instance, &req_desc);

        wait_and_poll(instance, cmd, MFI_POLL_TIMEOUT_SECS);

        frame_hdr = &cmd->frame->hdr;
        if (frame_hdr->cmd_status != 0) {
                ret = 1;
                goto fail_fw_init;
        }
        dev_info(&instance->pdev->dev, "Init cmd success\n");

        ret = 0;

fail_fw_init:
        megasas_return_cmd(instance, cmd);
        if (IOCInitMessage)
                dma_free_coherent(&instance->pdev->dev,
                                  sizeof(struct MPI2_IOC_INIT_REQUEST),
                                  IOCInitMessage, ioc_init_handle);
fail_get_cmd:
        return ret;
}

/**
 * megasas_sync_pd_seq_num -    JBOD SEQ MAP
 * @instance:           Adapter soft state
 * @pend:               set to 1, if it is pended jbod map.
 *
 * Issue Jbod map to the firmware. If it is pended command,
 * issue command and return. If it is first instance of jbod map
 * issue and receive command.
 */
int
megasas_sync_pd_seq_num(struct megasas_instance *instance, bool pend) {
        int ret = 0;
        u32 pd_seq_map_sz;
        struct megasas_cmd *cmd;
        struct megasas_dcmd_frame *dcmd;
        struct fusion_context *fusion = instance->ctrl_context;
        struct MR_PD_CFG_SEQ_NUM_SYNC *pd_sync;
        dma_addr_t pd_seq_h;

        pd_sync = (void *)fusion->pd_seq_sync[(instance->pd_seq_map_id & 1)];
        pd_seq_h = fusion->pd_seq_phys[(instance->pd_seq_map_id & 1)];
        pd_seq_map_sz = sizeof(struct MR_PD_CFG_SEQ_NUM_SYNC) +
                        (sizeof(struct MR_PD_CFG_SEQ) *
                        (MAX_PHYSICAL_DEVICES - 1));

        cmd = megasas_get_cmd(instance);
        if (!cmd) {
                dev_err(&instance->pdev->dev,
                        "Could not get mfi cmd. Fail from %s %d\n",
                        __func__, __LINE__);
                return -ENOMEM;
        }

        dcmd = &cmd->frame->dcmd;

        memset(pd_sync, 0, pd_seq_map_sz);
        memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);
        dcmd->cmd = MFI_CMD_DCMD;
        dcmd->cmd_status = 0xFF;
        dcmd->sge_count = 1;
        dcmd->timeout = 0;
        dcmd->pad_0 = 0;
        dcmd->data_xfer_len = cpu_to_le32(pd_seq_map_sz);
        dcmd->opcode = cpu_to_le32(MR_DCMD_SYSTEM_PD_MAP_GET_INFO);
        dcmd->sgl.sge32[0].phys_addr = cpu_to_le32(pd_seq_h);
        dcmd->sgl.sge32[0].length = cpu_to_le32(pd_seq_map_sz);

        if (pend) {
                dcmd->mbox.b[0] = MEGASAS_DCMD_MBOX_PEND_FLAG;
                dcmd->flags = cpu_to_le16(MFI_FRAME_DIR_WRITE);
                instance->jbod_seq_cmd = cmd;
                instance->instancet->issue_dcmd(instance, cmd);
                return 0;
        }

        dcmd->flags = cpu_to_le16(MFI_FRAME_DIR_READ);

        /* Below code is only for non pended DCMD */
        if (instance->ctrl_context && !instance->mask_interrupts)
                ret = megasas_issue_blocked_cmd(instance, cmd,
                        MFI_IO_TIMEOUT_SECS);
        else
                ret = megasas_issue_polled(instance, cmd);

        if (le32_to_cpu(pd_sync->count) > MAX_PHYSICAL_DEVICES) {
                dev_warn(&instance->pdev->dev,
                        "driver supports max %d JBOD, but FW reports %d\n",
                        MAX_PHYSICAL_DEVICES, le32_to_cpu(pd_sync->count));
                ret = -EINVAL;
        }

        if (ret == DCMD_TIMEOUT && instance->ctrl_context)
                megaraid_sas_kill_hba(instance);

        if (ret == DCMD_SUCCESS)
                instance->pd_seq_map_id++;

        megasas_return_cmd(instance, cmd);
        return ret;
}

/*
 * megasas_get_ld_map_info -    Returns FW's ld_map structure
 * @instance:                           Adapter soft state
 * @pend:                               Pend the command or not
 * Issues an internal command (DCMD) to get the FW's controller PD
 * list structure.  This information is mainly used to find out SYSTEM
 * supported by the FW.
 * dcmd.mbox value setting for MR_DCMD_LD_MAP_GET_INFO
 * dcmd.mbox.b[0]       - number of LDs being sync'd
 * dcmd.mbox.b[1]       - 0 - complete command immediately.
 *                      - 1 - pend till config change
 * dcmd.mbox.b[2]       - 0 - supports max 64 lds and uses legacy MR_FW_RAID_MAP
 *                      - 1 - supports max MAX_LOGICAL_DRIVES_EXT lds and
 *                              uses extended struct MR_FW_RAID_MAP_EXT
 */
static int
megasas_get_ld_map_info(struct megasas_instance *instance)
{
        int ret = 0;
        struct megasas_cmd *cmd;
        struct megasas_dcmd_frame *dcmd;
        void *ci;
        dma_addr_t ci_h = 0;
        u32 size_map_info;
        struct fusion_context *fusion;

        cmd = megasas_get_cmd(instance);

        if (!cmd) {
                dev_printk(KERN_DEBUG, &instance->pdev->dev, "Failed to get cmd for map info\n");
                return -ENOMEM;
        }

        fusion = instance->ctrl_context;

        if (!fusion) {
                megasas_return_cmd(instance, cmd);
                return -ENXIO;
        }

        dcmd = &cmd->frame->dcmd;

        size_map_info = fusion->current_map_sz;

        ci = (void *) fusion->ld_map[(instance->map_id & 1)];
        ci_h = fusion->ld_map_phys[(instance->map_id & 1)];

        if (!ci) {
                dev_printk(KERN_DEBUG, &instance->pdev->dev, "Failed to alloc mem for ld_map_info\n");

                megasas_return_cmd(instance, cmd);
                return -ENOMEM;
        }

        memset(ci, 0, fusion->max_map_sz);
        memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);
#if VD_EXT_DEBUG
        dev_dbg(&instance->pdev->dev,
                "%s sending MR_DCMD_LD_MAP_GET_INFO with size %d\n",
                __func__, cpu_to_le32(size_map_info));
#endif
        dcmd->cmd = MFI_CMD_DCMD;
        dcmd->cmd_status = 0xFF;
        dcmd->sge_count = 1;
        dcmd->flags = cpu_to_le16(MFI_FRAME_DIR_READ);
        dcmd->timeout = 0;
        dcmd->pad_0 = 0;
        dcmd->data_xfer_len = cpu_to_le32(size_map_info);
        dcmd->opcode = cpu_to_le32(MR_DCMD_LD_MAP_GET_INFO);
        dcmd->sgl.sge32[0].phys_addr = cpu_to_le32(ci_h);
        dcmd->sgl.sge32[0].length = cpu_to_le32(size_map_info);

        if (instance->ctrl_context && !instance->mask_interrupts)
                ret = megasas_issue_blocked_cmd(instance, cmd,
                        MFI_IO_TIMEOUT_SECS);
        else
                ret = megasas_issue_polled(instance, cmd);

        if (ret == DCMD_TIMEOUT && instance->ctrl_context)
                megaraid_sas_kill_hba(instance);

        megasas_return_cmd(instance, cmd);

        return ret;
}

u8
megasas_get_map_info(struct megasas_instance *instance)
{
        struct fusion_context *fusion = instance->ctrl_context;

        fusion->fast_path_io = 0;
        if (!megasas_get_ld_map_info(instance)) {
                if (MR_ValidateMapInfo(instance)) {
                        fusion->fast_path_io = 1;
                        return 0;
                }
        }
        return 1;
}

/*
 * megasas_sync_map_info -      Returns FW's ld_map structure
 * @instance:                           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 SYSTEM
 * supported by the FW.
 */
int
megasas_sync_map_info(struct megasas_instance *instance)
{
        int ret = 0, i;
        struct megasas_cmd *cmd;
        struct megasas_dcmd_frame *dcmd;
        u32 size_sync_info, num_lds;
        struct fusion_context *fusion;
        struct MR_LD_TARGET_SYNC *ci = NULL;
        struct MR_DRV_RAID_MAP_ALL *map;
        struct MR_LD_RAID  *raid;
        struct MR_LD_TARGET_SYNC *ld_sync;
        dma_addr_t ci_h = 0;
        u32 size_map_info;

        cmd = megasas_get_cmd(instance);

        if (!cmd) {
                dev_printk(KERN_DEBUG, &instance->pdev->dev, "Failed to get cmd for sync info\n");
                return -ENOMEM;
        }

        fusion = instance->ctrl_context;

        if (!fusion) {
                megasas_return_cmd(instance, cmd);
                return 1;
        }

        map = fusion->ld_drv_map[instance->map_id & 1];

        num_lds = le16_to_cpu(map->raidMap.ldCount);

        dcmd = &cmd->frame->dcmd;

        size_sync_info = sizeof(struct MR_LD_TARGET_SYNC) *num_lds;

        memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);

        ci = (struct MR_LD_TARGET_SYNC *)
          fusion->ld_map[(instance->map_id - 1) & 1];
        memset(ci, 0, fusion->max_map_sz);

        ci_h = fusion->ld_map_phys[(instance->map_id - 1) & 1];

        ld_sync = (struct MR_LD_TARGET_SYNC *)ci;

        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;
        }

        size_map_info = fusion->current_map_sz;

        dcmd->cmd = MFI_CMD_DCMD;
        dcmd->cmd_status = 0xFF;
        dcmd->sge_count = 1;
        dcmd->flags = cpu_to_le16(MFI_FRAME_DIR_WRITE);
        dcmd->timeout = 0;
        dcmd->pad_0 = 0;
        dcmd->data_xfer_len = cpu_to_le32(size_map_info);
        dcmd->mbox.b[0] = num_lds;
        dcmd->mbox.b[1] = MEGASAS_DCMD_MBOX_PEND_FLAG;
        dcmd->opcode = cpu_to_le32(MR_DCMD_LD_MAP_GET_INFO);
        dcmd->sgl.sge32[0].phys_addr = cpu_to_le32(ci_h);
        dcmd->sgl.sge32[0].length = cpu_to_le32(size_map_info);

        instance->map_update_cmd = cmd;

        instance->instancet->issue_dcmd(instance, cmd);

        return ret;
}

/*
 * meagasas_display_intel_branding - Display branding string
 * @instance: per adapter object
 *
 * Return nothing.
 */
static void
megasas_display_intel_branding(struct megasas_instance *instance)
{
        if (instance->pdev->subsystem_vendor != PCI_VENDOR_ID_INTEL)
                return;

        switch (instance->pdev->device) {
        case PCI_DEVICE_ID_LSI_INVADER:
                switch (instance->pdev->subsystem_device) {
                case MEGARAID_INTEL_RS3DC080_SSDID:
                        dev_info(&instance->pdev->dev, "scsi host %d: %s\n",
                                instance->host->host_no,
                                MEGARAID_INTEL_RS3DC080_BRANDING);
                        break;
                case MEGARAID_INTEL_RS3DC040_SSDID:
                        dev_info(&instance->pdev->dev, "scsi host %d: %s\n",
                                instance->host->host_no,
                                MEGARAID_INTEL_RS3DC040_BRANDING);
                        break;
                case MEGARAID_INTEL_RS3SC008_SSDID:
                        dev_info(&instance->pdev->dev, "scsi host %d: %s\n",
                                instance->host->host_no,
                                MEGARAID_INTEL_RS3SC008_BRANDING);
                        break;
                case MEGARAID_INTEL_RS3MC044_SSDID:
                        dev_info(&instance->pdev->dev, "scsi host %d: %s\n",
                                instance->host->host_no,
                                MEGARAID_INTEL_RS3MC044_BRANDING);
                        break;
                default:
                        break;
                }
                break;
        case PCI_DEVICE_ID_LSI_FURY:
                switch (instance->pdev->subsystem_device) {
                case MEGARAID_INTEL_RS3WC080_SSDID:
                        dev_info(&instance->pdev->dev, "scsi host %d: %s\n",
                                instance->host->host_no,
                                MEGARAID_INTEL_RS3WC080_BRANDING);
                        break;
                case MEGARAID_INTEL_RS3WC040_SSDID:
                        dev_info(&instance->pdev->dev, "scsi host %d: %s\n",
                                instance->host->host_no,
                                MEGARAID_INTEL_RS3WC040_BRANDING);
                        break;
                default:
                        break;
                }
                break;
        case PCI_DEVICE_ID_LSI_CUTLASS_52:
        case PCI_DEVICE_ID_LSI_CUTLASS_53:
                switch (instance->pdev->subsystem_device) {
                case MEGARAID_INTEL_RMS3BC160_SSDID:
                        dev_info(&instance->pdev->dev, "scsi host %d: %s\n",
                                instance->host->host_no,
                                MEGARAID_INTEL_RMS3BC160_BRANDING);
                        break;
                default:
                        break;
                }
                break;
        default:
                break;
        }
}

/**
 * megasas_init_adapter_fusion -        Initializes the FW
 * @instance:           Adapter soft state
 *
 * This is the main function for initializing firmware.
 */
u32
megasas_init_adapter_fusion(struct megasas_instance *instance)
{
        struct megasas_register_set __iomem *reg_set;
        struct fusion_context *fusion;
        u32 max_cmd, scratch_pad_2;
        int i = 0, count;

        fusion = instance->ctrl_context;

        reg_set = instance->reg_set;

        megasas_fusion_update_can_queue(instance, PROBE_CONTEXT);

        /*
         * Reduce the max supported cmds by 1. This is to ensure that the
         * reply_q_sz (1 more than the max cmd that driver may send)
         * does not exceed max cmds that the FW can support
         */
        instance->max_fw_cmds = instance->max_fw_cmds-1;

        /*
         * Only Driver's internal DCMDs and IOCTL DCMDs needs to have MFI frames
         */
        instance->max_mfi_cmds =
                MEGASAS_FUSION_INTERNAL_CMDS + MEGASAS_FUSION_IOCTL_CMDS;

        max_cmd = instance->max_fw_cmds;

        fusion->reply_q_depth = 2 * (((max_cmd + 1 + 15)/16)*16);

        fusion->request_alloc_sz =
                sizeof(union MEGASAS_REQUEST_DESCRIPTOR_UNION) *max_cmd;
        fusion->reply_alloc_sz = sizeof(union MPI2_REPLY_DESCRIPTORS_UNION)
                *(fusion->reply_q_depth);
        fusion->io_frames_alloc_sz = MEGA_MPI2_RAID_DEFAULT_IO_FRAME_SIZE +
                (MEGA_MPI2_RAID_DEFAULT_IO_FRAME_SIZE *
                 (max_cmd + 1)); /* Extra 1 for SMID 0 */

        scratch_pad_2 = readl(&instance->reg_set->outbound_scratch_pad_2);
        /* If scratch_pad_2 & MEGASAS_MAX_CHAIN_SIZE_UNITS_MASK is set,
         * Firmware support extended IO chain frame which is 4 times more than
         * legacy Firmware.
         * Legacy Firmware - Frame size is (8 * 128) = 1K
         * 1M IO Firmware  - Frame size is (8 * 128 * 4)  = 4K
         */
        if (scratch_pad_2 & MEGASAS_MAX_CHAIN_SIZE_UNITS_MASK)
                instance->max_chain_frame_sz =
                        ((scratch_pad_2 & MEGASAS_MAX_CHAIN_SIZE_MASK) >>
                        MEGASAS_MAX_CHAIN_SHIFT) * MEGASAS_1MB_IO;
        else
                instance->max_chain_frame_sz =
                        ((scratch_pad_2 & MEGASAS_MAX_CHAIN_SIZE_MASK) >>
                        MEGASAS_MAX_CHAIN_SHIFT) * MEGASAS_256K_IO;

        if (instance->max_chain_frame_sz < MEGASAS_CHAIN_FRAME_SZ_MIN) {
                dev_warn(&instance->pdev->dev, "frame size %d invalid, fall back to legacy max frame size %d\n",
                        instance->max_chain_frame_sz,
                        MEGASAS_CHAIN_FRAME_SZ_MIN);
                instance->max_chain_frame_sz = MEGASAS_CHAIN_FRAME_SZ_MIN;
        }

        fusion->max_sge_in_main_msg =
                (MEGA_MPI2_RAID_DEFAULT_IO_FRAME_SIZE
                        - offsetof(struct MPI2_RAID_SCSI_IO_REQUEST, SGL))/16;

        fusion->max_sge_in_chain =
                instance->max_chain_frame_sz
                        / sizeof(union MPI2_SGE_IO_UNION);

        instance->max_num_sge =
                rounddown_pow_of_two(fusion->max_sge_in_main_msg
                        + fusion->max_sge_in_chain - 2);

        /* Used for pass thru MFI frame (DCMD) */
        fusion->chain_offset_mfi_pthru =
                offsetof(struct MPI2_RAID_SCSI_IO_REQUEST, SGL)/16;

        fusion->chain_offset_io_request =
                (MEGA_MPI2_RAID_DEFAULT_IO_FRAME_SIZE -
                 sizeof(union MPI2_SGE_IO_UNION))/16;

        count = instance->msix_vectors > 0 ? instance->msix_vectors : 1;
        for (i = 0 ; i < count; i++)
                fusion->last_reply_idx[i] = 0;

        /*
         * For fusion adapters, 3 commands for IOCTL and 5 commands
         * for driver's internal DCMDs.
         */
        instance->max_scsi_cmds = instance->max_fw_cmds -
                                (MEGASAS_FUSION_INTERNAL_CMDS +
                                MEGASAS_FUSION_IOCTL_CMDS);
        sema_init(&instance->ioctl_sem, MEGASAS_FUSION_IOCTL_CMDS);

        /*
         * Allocate memory for descriptors
         * Create a pool of commands
         */
        if (megasas_alloc_cmds(instance))
                goto fail_alloc_mfi_cmds;
        if (megasas_alloc_cmds_fusion(instance))
                goto fail_alloc_cmds;

        if (megasas_ioc_init_fusion(instance))
                goto fail_ioc_init;

        megasas_display_intel_branding(instance);
        if (megasas_get_ctrl_info(instance)) {
                dev_err(&instance->pdev->dev,
                        "Could not get controller info. Fail from %s %d\n",
                        __func__, __LINE__);
                goto fail_ioc_init;
        }

        instance->flag_ieee = 1;
        fusion->fast_path_io = 0;

        fusion->drv_map_pages = get_order(fusion->drv_map_sz);
        for (i = 0; i < 2; i++) {
                fusion->ld_map[i] = NULL;
                fusion->ld_drv_map[i] = (void *)__get_free_pages(GFP_KERNEL,
                        fusion->drv_map_pages);
                if (!fusion->ld_drv_map[i]) {
                        dev_err(&instance->pdev->dev, "Could not allocate "
                                "memory for local map info for %d pages\n",
                                fusion->drv_map_pages);
                        if (i == 1)
                                free_pages((ulong)fusion->ld_drv_map[0],
                                        fusion->drv_map_pages);
                        goto fail_ioc_init;
                }
                memset(fusion->ld_drv_map[i], 0,
                        ((1 << PAGE_SHIFT) << fusion->drv_map_pages));
        }

        for (i = 0; i < 2; i++) {
                fusion->ld_map[i] = dma_alloc_coherent(&instance->pdev->dev,
                                                       fusion->max_map_sz,
                                                       &fusion->ld_map_phys[i],
                                                       GFP_KERNEL);
                if (!fusion->ld_map[i]) {
                        dev_err(&instance->pdev->dev, "Could not allocate memory "
                               "for map info\n");
                        goto fail_map_info;
                }
        }

        if (!megasas_get_map_info(instance))
                megasas_sync_map_info(instance);

        return 0;

fail_map_info:
        if (i == 1)
                dma_free_coherent(&instance->pdev->dev, fusion->max_map_sz,
                                  fusion->ld_map[0], fusion->ld_map_phys[0]);
fail_ioc_init:
        megasas_free_cmds_fusion(instance);
fail_alloc_cmds:
        megasas_free_cmds(instance);
fail_alloc_mfi_cmds:
        return 1;
}

/**
 * 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_cmd_status(struct megasas_cmd_fusion *cmd, u8 status, u8 ext_status)
{

        switch (status) {

        case MFI_STAT_OK:
                cmd->scmd->result = DID_OK << 16;
                break;

        case MFI_STAT_SCSI_IO_FAILED:
        case MFI_STAT_LD_INIT_IN_PROGRESS:
                cmd->scmd->result = (DID_ERROR << 16) | ext_status;
                break;

        case MFI_STAT_SCSI_DONE_WITH_ERROR:

                cmd->scmd->result = (DID_OK << 16) | ext_status;
                if (ext_status == SAM_STAT_CHECK_CONDITION) {
                        memset(cmd->scmd->sense_buffer, 0,
                               SCSI_SENSE_BUFFERSIZE);
                        memcpy(cmd->scmd->sense_buffer, cmd->sense,
                               SCSI_SENSE_BUFFERSIZE);
                        cmd->scmd->result |= DRIVER_SENSE << 24;
                }
                break;

        case MFI_STAT_LD_OFFLINE:
        case MFI_STAT_DEVICE_NOT_FOUND:
                cmd->scmd->result = DID_BAD_TARGET << 16;
                break;
        case MFI_STAT_CONFIG_SEQ_MISMATCH:
                cmd->scmd->result = DID_IMM_RETRY << 16;
                break;
        default:
                dev_printk(KERN_DEBUG, &cmd->instance->pdev->dev, "FW status %#x\n", status);
                cmd->scmd->result = DID_ERROR << 16;
                break;
        }
}

/**
 * megasas_make_sgl_fusion -    Prepares 32-bit SGL
 * @instance:           Adapter soft state
 * @scp:                SCSI command from the mid-layer
 * @sgl_ptr:            SGL to be filled in
 * @cmd:                cmd we are working on
 *
 * If successful, this function returns the number of SG elements.
 */
static int
megasas_make_sgl_fusion(struct megasas_instance *instance,
                        struct scsi_cmnd *scp,
                        struct MPI25_IEEE_SGE_CHAIN64 *sgl_ptr,
                        struct megasas_cmd_fusion *cmd)
{
        int i, sg_processed, sge_count;
        struct scatterlist *os_sgl;
        struct fusion_context *fusion;

        fusion = instance->ctrl_context;

        if (fusion->adapter_type == INVADER_SERIES) {
                struct MPI25_IEEE_SGE_CHAIN64 *sgl_ptr_end = sgl_ptr;
                sgl_ptr_end += fusion->max_sge_in_main_msg - 1;
                sgl_ptr_end->Flags = 0;
        }

        sge_count = scsi_dma_map(scp);

        BUG_ON(sge_count < 0);

        if (sge_count > instance->max_num_sge || !sge_count)
                return sge_count;

        scsi_for_each_sg(scp, os_sgl, sge_count, i) {
                sgl_ptr->Length = cpu_to_le32(sg_dma_len(os_sgl));
                sgl_ptr->Address = cpu_to_le64(sg_dma_address(os_sgl));
                sgl_ptr->Flags = 0;
                if (fusion->adapter_type == INVADER_SERIES)
                        if (i == sge_count - 1)
                                sgl_ptr->Flags = IEEE_SGE_FLAGS_END_OF_LIST;
                sgl_ptr++;

                sg_processed = i + 1;

                if ((sg_processed ==  (fusion->max_sge_in_main_msg - 1)) &&
                    (sge_count > fusion->max_sge_in_main_msg)) {

                        struct MPI25_IEEE_SGE_CHAIN64 *sg_chain;
                        if (fusion->adapter_type == INVADER_SERIES) {
                                if ((le16_to_cpu(cmd->io_request->IoFlags) &
                                        MPI25_SAS_DEVICE0_FLAGS_ENABLED_FAST_PATH) !=
                                        MPI25_SAS_DEVICE0_FLAGS_ENABLED_FAST_PATH)
                                        cmd->io_request->ChainOffset =
                                                fusion->
                                                chain_offset_io_request;
                                else
                                        cmd->io_request->ChainOffset = 0;
                        } else
                                cmd->io_request->ChainOffset =
                                        fusion->chain_offset_io_request;

                        sg_chain = sgl_ptr;
                        /* Prepare chain element */
                        sg_chain->NextChainOffset = 0;
                        if (fusion->adapter_type == INVADER_SERIES)
                                sg_chain->Flags = IEEE_SGE_FLAGS_CHAIN_ELEMENT;
                        else
                                sg_chain->Flags =
                                        (IEEE_SGE_FLAGS_CHAIN_ELEMENT |
                                         MPI2_IEEE_SGE_FLAGS_IOCPLBNTA_ADDR);
                        sg_chain->Length =  cpu_to_le32((sizeof(union MPI2_SGE_IO_UNION) * (sge_count - sg_processed)));
                        sg_chain->Address = cpu_to_le64(cmd->sg_frame_phys_addr);

                        sgl_ptr =
                          (struct MPI25_IEEE_SGE_CHAIN64 *)cmd->sg_frame;
                        memset(sgl_ptr, 0, instance->max_chain_frame_sz);
                }
        }

        return sge_count;
}

/**
 * megasas_set_pd_lba - Sets PD LBA
 * @cdb:                CDB
 * @cdb_len:            cdb length
 * @start_blk:          Start block of IO
 *
 * Used to set the PD LBA in CDB for FP IOs
 */
void
megasas_set_pd_lba(struct MPI2_RAID_SCSI_IO_REQUEST *io_request, u8 cdb_len,
                   struct IO_REQUEST_INFO *io_info, struct scsi_cmnd *scp,
                   struct MR_DRV_RAID_MAP_ALL *local_map_ptr, u32 ref_tag)
{
        struct MR_LD_RAID *raid;
        u32 ld;
        u64 start_blk = io_info->pdBlock;
        u8 *cdb = io_request->CDB.CDB32;
        u32 num_blocks = io_info->numBlocks;
        u8 opcode = 0, flagvals = 0, groupnum = 0, control = 0;

        /* Check if T10 PI (DIF) is enabled for this LD */
        ld = MR_TargetIdToLdGet(io_info->ldTgtId, local_map_ptr);
        raid = MR_LdRaidGet(ld, local_map_ptr);
        if (raid->capability.ldPiMode == MR_PROT_INFO_TYPE_CONTROLLER) {
                memset(cdb, 0, sizeof(io_request->CDB.CDB32));
                cdb[0] =  MEGASAS_SCSI_VARIABLE_LENGTH_CMD;
                cdb[7] =  MEGASAS_SCSI_ADDL_CDB_LEN;

                if (scp->sc_data_direction == PCI_DMA_FROMDEVICE)
                        cdb[9] = MEGASAS_SCSI_SERVICE_ACTION_READ32;
                else
                        cdb[9] = MEGASAS_SCSI_SERVICE_ACTION_WRITE32;
                cdb[10] = MEGASAS_RD_WR_PROTECT_CHECK_ALL;

                /* LBA */
                cdb[12] = (u8)((start_blk >> 56) & 0xff);
                cdb[13] = (u8)((start_blk >> 48) & 0xff);
                cdb[14] = (u8)((start_blk >> 40) & 0xff);
                cdb[15] = (u8)((start_blk >> 32) & 0xff);
                cdb[16] = (u8)((start_blk >> 24) & 0xff);
                cdb[17] = (u8)((start_blk >> 16) & 0xff);
                cdb[18] = (u8)((start_blk >> 8) & 0xff);
                cdb[19] = (u8)(start_blk & 0xff);

                /* Logical block reference tag */
                io_request->CDB.EEDP32.PrimaryReferenceTag =
                        cpu_to_be32(ref_tag);
                io_request->CDB.EEDP32.PrimaryApplicationTagMask = cpu_to_be16(0xffff);
                io_request->IoFlags = cpu_to_le16(32); /* Specify 32-byte cdb */

                /* Transfer length */
                cdb[28] = (u8)((num_blocks >> 24) & 0xff);
                cdb[29] = (u8)((num_blocks >> 16) & 0xff);
                cdb[30] = (u8)((num_blocks >> 8) & 0xff);
                cdb[31] = (u8)(num_blocks & 0xff);

                /* set SCSI IO EEDPFlags */
                if (scp->sc_data_direction == PCI_DMA_FROMDEVICE) {
                        io_request->EEDPFlags = cpu_to_le16(
                                MPI2_SCSIIO_EEDPFLAGS_INC_PRI_REFTAG  |
                                MPI2_SCSIIO_EEDPFLAGS_CHECK_REFTAG |
                                MPI2_SCSIIO_EEDPFLAGS_CHECK_REMOVE_OP |
                                MPI2_SCSIIO_EEDPFLAGS_CHECK_APPTAG |
                                MPI2_SCSIIO_EEDPFLAGS_CHECK_GUARD);
                } else {
                        io_request->EEDPFlags = cpu_to_le16(
                                MPI2_SCSIIO_EEDPFLAGS_INC_PRI_REFTAG |
                                MPI2_SCSIIO_EEDPFLAGS_INSERT_OP);
                }
                io_request->Control |= cpu_to_le32((0x4 << 26));
                io_request->EEDPBlockSize = cpu_to_le32(scp->device->sector_size);
        } else {
                /* Some drives don't support 16/12 byte CDB's, convert to 10 */
                if (((cdb_len == 12) || (cdb_len == 16)) &&
                    (start_blk <= 0xffffffff)) {
                        if (cdb_len == 16) {
                                opcode = cdb[0] == READ_16 ? READ_10 : WRITE_10;
                                flagvals = cdb[1];
                                groupnum = cdb[14];
                                control = cdb[15];
                        } else {
                                opcode = cdb[0] == READ_12 ? READ_10 : WRITE_10;
                                flagvals = cdb[1];
                                groupnum = cdb[10];
                                control = cdb[11];
                        }

                        memset(cdb, 0, sizeof(io_request->CDB.CDB32));

                        cdb[0] = opcode;
                        cdb[1] = flagvals;
                        cdb[6] = groupnum;
                        cdb[9] = control;

                        /* Transfer length */
                        cdb[8] = (u8)(num_blocks & 0xff);
                        cdb[7] = (u8)((num_blocks >> 8) & 0xff);

                        io_request->IoFlags = cpu_to_le16(10); /* Specify 10-byte cdb */
                        cdb_len = 10;
                } else if ((cdb_len < 16) && (start_blk > 0xffffffff)) {
                        /* Convert to 16 byte CDB for large LBA's */
                        switch (cdb_len) {
                        case 6:
                                opcode = cdb[0] == READ_6 ? READ_16 : WRITE_16;
                                control = cdb[5];
                                break;
                        case 10:
                                opcode =
                                        cdb[0] == READ_10 ? READ_16 : WRITE_16;
                                flagvals = cdb[1];
                                groupnum = cdb[6];
                                control = cdb[9];
                                break;
                        case 12:
                                opcode =
                                        cdb[0] == READ_12 ? READ_16 : WRITE_16;
                                flagvals = cdb[1];
                                groupnum = cdb[10];
                                control = cdb[11];
                                break;
                        }

                        memset(cdb, 0, sizeof(io_request->CDB.CDB32));

                        cdb[0] = opcode;
                        cdb[1] = flagvals;
                        cdb[14] = groupnum;
                        cdb[15] = control;

                        /* Transfer length */
                        cdb[13] = (u8)(num_blocks & 0xff);
                        cdb[12] = (u8)((num_blocks >> 8) & 0xff);
                        cdb[11] = (u8)((num_blocks >> 16) & 0xff);
                        cdb[10] = (u8)((num_blocks >> 24) & 0xff);

                        io_request->IoFlags = cpu_to_le16(16); /* Specify 16-byte cdb */
                        cdb_len = 16;
                }

                /* Normal case, just load LBA here */
                switch (cdb_len) {
                case 6:
                {
                        u8 val = cdb[1] & 0xE0;
                        cdb[3] = (u8)(start_blk & 0xff);
                        cdb[2] = (u8)((start_blk >> 8) & 0xff);
                        cdb[1] = val | ((u8)(start_blk >> 16) & 0x1f);
                        break;
                }
                case 10:
                        cdb[5] = (u8)(start_blk & 0xff);
                        cdb[4] = (u8)((start_blk >> 8) & 0xff);
                        cdb[3] = (u8)((start_blk >> 16) & 0xff);
                        cdb[2] = (u8)((start_blk >> 24) & 0xff);
                        break;
                case 12:
                        cdb[5]    = (u8)(start_blk & 0xff);
                        cdb[4]    = (u8)((start_blk >> 8) & 0xff);
                        cdb[3]    = (u8)((start_blk >> 16) & 0xff);
                        cdb[2]    = (u8)((start_blk >> 24) & 0xff);
                        break;
                case 16:
                        cdb[9]    = (u8)(start_blk & 0xff);
                        cdb[8]    = (u8)((start_blk >> 8) & 0xff);
                        cdb[7]    = (u8)((start_blk >> 16) & 0xff);
                        cdb[6]    = (u8)((start_blk >> 24) & 0xff);
                        cdb[5]    = (u8)((start_blk >> 32) & 0xff);
                        cdb[4]    = (u8)((start_blk >> 40) & 0xff);
                        cdb[3]    = (u8)((start_blk >> 48) & 0xff);
                        cdb[2]    = (u8)((start_blk >> 56) & 0xff);
                        break;
                }
        }
}

/**
 * megasas_build_ldio_fusion -  Prepares IOs to devices
 * @instance:           Adapter soft state
 * @scp:                SCSI command
 * @cmd:                Command to be prepared
 *
 * Prepares the io_request and chain elements (sg_frame) for IO
 * The IO can be for PD (Fast Path) or LD
 */
void
megasas_build_ldio_fusion(struct megasas_instance *instance,
                          struct scsi_cmnd *scp,
                          struct megasas_cmd_fusion *cmd)
{
        u8 fp_possible;
        u32 start_lba_lo, start_lba_hi, device_id, datalength = 0;
        struct MPI2_RAID_SCSI_IO_REQUEST *io_request;
        union MEGASAS_REQUEST_DESCRIPTOR_UNION *req_desc;
        struct IO_REQUEST_INFO io_info;
        struct fusion_context *fusion;
        struct MR_DRV_RAID_MAP_ALL *local_map_ptr;
        u8 *raidLUN;

        device_id = MEGASAS_DEV_INDEX(scp);

        fusion = instance->ctrl_context;

        io_request = cmd->io_request;
        io_request->RaidContext.VirtualDiskTgtId = cpu_to_le16(device_id);
        io_request->RaidContext.status = 0;
        io_request->RaidContext.exStatus = 0;

        req_desc = (union MEGASAS_REQUEST_DESCRIPTOR_UNION *)cmd->request_desc;

        start_lba_lo = 0;
        start_lba_hi = 0;
        fp_possible = 0;

        /*
         * 6-byte READ(0x08) or WRITE(0x0A) cdb
         */
        if (scp->cmd_len == 6) {
                datalength = (u32) scp->cmnd[4];
                start_lba_lo = ((u32) scp->cmnd[1] << 16) |
                        ((u32) scp->cmnd[2] << 8) | (u32) scp->cmnd[3];

                start_lba_lo &= 0x1FFFFF;
        }

        /*
         * 10-byte READ(0x28) or WRITE(0x2A) cdb
         */
        else if (scp->cmd_len == 10) {
                datalength = (u32) scp->cmnd[8] |
                        ((u32) scp->cmnd[7] << 8);
                start_lba_lo = ((u32) scp->cmnd[2] << 24) |
                        ((u32) scp->cmnd[3] << 16) |
                        ((u32) scp->cmnd[4] << 8) | (u32) scp->cmnd[5];
        }

        /*
         * 12-byte READ(0xA8) or WRITE(0xAA) cdb
         */
        else if (scp->cmd_len == 12) {
                datalength = ((u32) scp->cmnd[6] << 24) |
                        ((u32) scp->cmnd[7] << 16) |
                        ((u32) scp->cmnd[8] << 8) | (u32) scp->cmnd[9];
                start_lba_lo = ((u32) scp->cmnd[2] << 24) |
                        ((u32) scp->cmnd[3] << 16) |
                        ((u32) scp->cmnd[4] << 8) | (u32) scp->cmnd[5];
        }

        /*
         * 16-byte READ(0x88) or WRITE(0x8A) cdb
         */
        else if (scp->cmd_len == 16) {
                datalength = ((u32) scp->cmnd[10] << 24) |
                        ((u32) scp->cmnd[11] << 16) |
                        ((u32) scp->cmnd[12] << 8) | (u32) scp->cmnd[13];
                start_lba_lo = ((u32) scp->cmnd[6] << 24) |
                        ((u32) scp->cmnd[7] << 16) |
                        ((u32) scp->cmnd[8] << 8) | (u32) scp->cmnd[9];

                start_lba_hi = ((u32) scp->cmnd[2] << 24) |
                        ((u32) scp->cmnd[3] << 16) |
                        ((u32) scp->cmnd[4] << 8) | (u32) scp->cmnd[5];
        }

        memset(&io_info, 0, sizeof(struct IO_REQUEST_INFO));
        io_info.ldStartBlock = ((u64)start_lba_hi << 32) | start_lba_lo;
        io_info.numBlocks = datalength;
        io_info.ldTgtId = device_id;
        io_request->DataLength = cpu_to_le32(scsi_bufflen(scp));

        if (scp->sc_data_direction == PCI_DMA_FROMDEVICE)
                io_info.isRead = 1;

        local_map_ptr = fusion->ld_drv_map[(instance->map_id & 1)];

        if ((MR_TargetIdToLdGet(device_id, local_map_ptr) >=
                instance->fw_supported_vd_count) || (!fusion->fast_path_io)) {
                io_request->RaidContext.regLockFlags  = 0;
                fp_possible = 0;
        } else {
                if (MR_BuildRaidContext(instance, &io_info,
                                        &io_request->RaidContext,
                                        local_map_ptr, &raidLUN))
                        fp_possible = io_info.fpOkForIo;
        }

        /* Use raw_smp_processor_id() for now until cmd->request->cpu is CPU
           id by default, not CPU group id, otherwise all MSI-X queues won't
           be utilized */
        cmd->request_desc->SCSIIO.MSIxIndex = instance->msix_vectors ?
                raw_smp_processor_id() % instance->msix_vectors : 0;

        if (fp_possible) {
                megasas_set_pd_lba(io_request, scp->cmd_len, &io_info, scp,
                                   local_map_ptr, start_lba_lo);
                io_request->Function = MPI2_FUNCTION_SCSI_IO_REQUEST;
                cmd->request_desc->SCSIIO.RequestFlags =
                        (MPI2_REQ_DESCRIPT_FLAGS_FP_IO
                         << MEGASAS_REQ_DESCRIPT_FLAGS_TYPE_SHIFT);
                if (fusion->adapter_type == INVADER_SERIES) {
                        if (io_request->RaidContext.regLockFlags ==
                            REGION_TYPE_UNUSED)
                                cmd->request_desc->SCSIIO.RequestFlags =
                                        (MEGASAS_REQ_DESCRIPT_FLAGS_NO_LOCK <<
                                        MEGASAS_REQ_DESCRIPT_FLAGS_TYPE_SHIFT);
                        io_request->RaidContext.Type = MPI2_TYPE_CUDA;
                        io_request->RaidContext.nseg = 0x1;
                        io_request->IoFlags |= cpu_to_le16(MPI25_SAS_DEVICE0_FLAGS_ENABLED_FAST_PATH);
                        io_request->RaidContext.regLockFlags |=
                          (MR_RL_FLAGS_GRANT_DESTINATION_CUDA |
                           MR_RL_FLAGS_SEQ_NUM_ENABLE);
                }
                if ((fusion->load_balance_info[device_id].loadBalanceFlag) &&
                    (io_info.isRead)) {
                        io_info.devHandle =
                                get_updated_dev_handle(instance,
                                        &fusion->load_balance_info[device_id],
                                        &io_info);
                        scp->SCp.Status |= MEGASAS_LOAD_BALANCE_FLAG;
                        cmd->pd_r1_lb = io_info.pd_after_lb;
                } else
                        scp->SCp.Status &= ~MEGASAS_LOAD_BALANCE_FLAG;

                if ((raidLUN[0] == 1) &&
                        (local_map_ptr->raidMap.devHndlInfo[io_info.pd_after_lb].validHandles > 1)) {
                        instance->dev_handle = !(instance->dev_handle);
                        io_info.devHandle =
                                local_map_ptr->raidMap.devHndlInfo[io_info.pd_after_lb].devHandle[instance->dev_handle];
                }

                cmd->request_desc->SCSIIO.DevHandle = io_info.devHandle;
                io_request->DevHandle = io_info.devHandle;
                /* populate the LUN field */
                memcpy(io_request->LUN, raidLUN, 8);
        } else {
                io_request->RaidContext.timeoutValue =
                        cpu_to_le16(local_map_ptr->raidMap.fpPdIoTimeoutSec);
                cmd->request_desc->SCSIIO.RequestFlags =
                        (MEGASAS_REQ_DESCRIPT_FLAGS_LD_IO
                         << MEGASAS_REQ_DESCRIPT_FLAGS_TYPE_SHIFT);
                if (fusion->adapter_type == INVADER_SERIES) {
                        if (io_info.do_fp_rlbypass ||
                                (io_request->RaidContext.regLockFlags == REGION_TYPE_UNUSED))
                                cmd->request_desc->SCSIIO.RequestFlags =
                                        (MEGASAS_REQ_DESCRIPT_FLAGS_NO_LOCK <<
                                        MEGASAS_REQ_DESCRIPT_FLAGS_TYPE_SHIFT);
                        io_request->RaidContext.Type = MPI2_TYPE_CUDA;
                        io_request->RaidContext.regLockFlags |=
                                (MR_RL_FLAGS_GRANT_DESTINATION_CPU0 |
                                 MR_RL_FLAGS_SEQ_NUM_ENABLE);
                        io_request->RaidContext.nseg = 0x1;
                }
                io_request->Function = MEGASAS_MPI2_FUNCTION_LD_IO_REQUEST;
                io_request->DevHandle = cpu_to_le16(device_id);
        } /* Not FP */
}

/**
 * megasas_build_ld_nonrw_fusion - prepares non rw ios for virtual disk
 * @instance:           Adapter soft state
 * @scp:                SCSI command
 * @cmd:                Command to be prepared
 *
 * Prepares the io_request frame for non-rw io cmds for vd.
 */
static void megasas_build_ld_nonrw_fusion(struct megasas_instance *instance,
                          struct scsi_cmnd *scmd, struct megasas_cmd_fusion *cmd)
{
        u32 device_id;
        struct MPI2_RAID_SCSI_IO_REQUEST *io_request;
        u16 pd_index = 0;
        struct MR_DRV_RAID_MAP_ALL *local_map_ptr;
        struct fusion_context *fusion = instance->ctrl_context;
        u8                          span, physArm;
        __le16                      devHandle;
        u32                         ld, arRef, pd;
        struct MR_LD_RAID                  *raid;
        struct RAID_CONTEXT                *pRAID_Context;
        u8 fp_possible = 1;

        io_request = cmd->io_request;
        device_id = MEGASAS_DEV_INDEX(scmd);
        pd_index = MEGASAS_PD_INDEX(scmd);
        local_map_ptr = fusion->ld_drv_map[(instance->map_id & 1)];
        io_request->DataLength = cpu_to_le32(scsi_bufflen(scmd));
        /* get RAID_Context pointer */
        pRAID_Context = &io_request->RaidContext;
        /* Check with FW team */
        pRAID_Context->VirtualDiskTgtId = cpu_to_le16(device_id);
        pRAID_Context->regLockRowLBA    = 0;
        pRAID_Context->regLockLength    = 0;

        if (fusion->fast_path_io && (
                device_id < instance->fw_supported_vd_count)) {

                ld = MR_TargetIdToLdGet(device_id, local_map_ptr);
                if (ld >= instance->fw_supported_vd_count)
                        fp_possible = 0;

                raid = MR_LdRaidGet(ld, local_map_ptr);
                if (!(raid->capability.fpNonRWCapable))
                        fp_possible = 0;
        } else
                fp_possible = 0;

        if (!fp_possible) {
                io_request->Function  = MEGASAS_MPI2_FUNCTION_LD_IO_REQUEST;
                io_request->DevHandle = cpu_to_le16(device_id);
                io_request->LUN[1] = scmd->device->lun;
                pRAID_Context->timeoutValue =
                        cpu_to_le16 (scmd->request->timeout / HZ);
                cmd->request_desc->SCSIIO.RequestFlags =
                        (MPI2_REQ_DESCRIPT_FLAGS_SCSI_IO <<
                        MEGASAS_REQ_DESCRIPT_FLAGS_TYPE_SHIFT);
        } else {

                /* set RAID context values */
                pRAID_Context->configSeqNum = raid->seqNum;
                pRAID_Context->regLockFlags = REGION_TYPE_SHARED_READ;
                pRAID_Context->timeoutValue = cpu_to_le16(raid->fpIoTimeoutForLd);

                /* get the DevHandle for the PD (since this is
                   fpNonRWCapable, this is a single disk RAID0) */
                span = physArm = 0;
                arRef = MR_LdSpanArrayGet(ld, span, local_map_ptr);
                pd = MR_ArPdGet(arRef, physArm, local_map_ptr);
                devHandle = MR_PdDevHandleGet(pd, local_map_ptr);

                /* build request descriptor */
                cmd->request_desc->SCSIIO.RequestFlags =
                        (MPI2_REQ_DESCRIPT_FLAGS_FP_IO <<
                        MEGASAS_REQ_DESCRIPT_FLAGS_TYPE_SHIFT);
                cmd->request_desc->SCSIIO.DevHandle = devHandle;

                /* populate the LUN field */
                memcpy(io_request->LUN, raid->LUN, 8);

                /* build the raidScsiIO structure */
                io_request->Function = MPI2_FUNCTION_SCSI_IO_REQUEST;
                io_request->DevHandle = devHandle;
        }
}

/**
 * megasas_build_syspd_fusion - prepares rw/non-rw ios for syspd
 * @instance:           Adapter soft state
 * @scp:                SCSI command
 * @cmd:                Command to be prepared
 * @fp_possible:        parameter to detect fast path or firmware path io.
 *
 * Prepares the io_request frame for rw/non-rw io cmds for syspds
 */
static void
megasas_build_syspd_fusion(struct megasas_instance *instance,
        struct scsi_cmnd *scmd, struct megasas_cmd_fusion *cmd, u8 fp_possible)
{
        u32 device_id;
        struct MPI2_RAID_SCSI_IO_REQUEST *io_request;
        u16 pd_index = 0;
        u16 os_timeout_value;
        u16 timeout_limit;
        struct MR_DRV_RAID_MAP_ALL *local_map_ptr;
        struct RAID_CONTEXT     *pRAID_Context;
        struct MR_PD_CFG_SEQ_NUM_SYNC *pd_sync;
        struct fusion_context *fusion = instance->ctrl_context;
        pd_sync = (void *)fusion->pd_seq_sync[(instance->pd_seq_map_id - 1) & 1];

        device_id = MEGASAS_DEV_INDEX(scmd);
        pd_index = MEGASAS_PD_INDEX(scmd);
        os_timeout_value = scmd->request->timeout / HZ;

        io_request = cmd->io_request;
        /* get RAID_Context pointer */
        pRAID_Context = &io_request->RaidContext;
        pRAID_Context->regLockFlags = 0;
        pRAID_Context->regLockRowLBA = 0;
        pRAID_Context->regLockLength = 0;
        io_request->DataLength = cpu_to_le32(scsi_bufflen(scmd));
        io_request->LUN[1] = scmd->device->lun;
        pRAID_Context->RAIDFlags = MR_RAID_FLAGS_IO_SUB_TYPE_SYSTEM_PD
                << MR_RAID_CTX_RAID_FLAGS_IO_SUB_TYPE_SHIFT;

        /* If FW supports PD sequence number */
        if (instance->use_seqnum_jbod_fp &&
                instance->pd_list[pd_index].driveType == TYPE_DISK) {
                /* TgtId must be incremented by 255 as jbod seq number is index
                 * below raid map
                 */
                pRAID_Context->VirtualDiskTgtId =
                        cpu_to_le16(device_id + (MAX_PHYSICAL_DEVICES - 1));
                pRAID_Context->configSeqNum = pd_sync->seq[pd_index].seqNum;
                io_request->DevHandle = pd_sync->seq[pd_index].devHandle;

                pRAID_Context->regLockFlags |=
                        (MR_RL_FLAGS_SEQ_NUM_ENABLE|MR_RL_FLAGS_GRANT_DESTINATION_CUDA);
        } else if (fusion->fast_path_io) {
                pRAID_Context->VirtualDiskTgtId = cpu_to_le16(device_id);
                pRAID_Context->configSeqNum = 0;
                local_map_ptr = fusion->ld_drv_map[(instance->map_id & 1)];
                io_request->DevHandle =
                        local_map_ptr->raidMap.devHndlInfo[device_id].curDevHdl;
        } else {
                /* Want to send all IO via FW path */
                pRAID_Context->VirtualDiskTgtId = cpu_to_le16(device_id);
                pRAID_Context->configSeqNum = 0;
                io_request->DevHandle = cpu_to_le16(0xFFFF);
        }

        cmd->request_desc->SCSIIO.DevHandle = io_request->DevHandle;
        cmd->request_desc->SCSIIO.MSIxIndex =
                instance->msix_vectors ?
                (raw_smp_processor_id() % instance->msix_vectors) : 0;


        if (!fp_possible) {
                /* system pd firmware path */
                io_request->Function  = MEGASAS_MPI2_FUNCTION_LD_IO_REQUEST;
                cmd->request_desc->SCSIIO.RequestFlags =
                        (MPI2_REQ_DESCRIPT_FLAGS_SCSI_IO <<
                                MEGASAS_REQ_DESCRIPT_FLAGS_TYPE_SHIFT);
                pRAID_Context->timeoutValue = cpu_to_le16(os_timeout_value);
                pRAID_Context->VirtualDiskTgtId = cpu_to_le16(device_id);
        } else {
                /* system pd Fast Path */
                io_request->Function = MPI2_FUNCTION_SCSI_IO_REQUEST;
                timeout_limit = (scmd->device->type == TYPE_DISK) ?
                                255 : 0xFFFF;
                pRAID_Context->timeoutValue =
                        cpu_to_le16((os_timeout_value > timeout_limit) ?
                        timeout_limit : os_timeout_value);
                if (fusion->adapter_type == INVADER_SERIES) {
                        pRAID_Context->Type = MPI2_TYPE_CUDA;
                        pRAID_Context->nseg = 0x1;
                        io_request->IoFlags |=
                                cpu_to_le16(MPI25_SAS_DEVICE0_FLAGS_ENABLED_FAST_PATH);
                }
                cmd->request_desc->SCSIIO.RequestFlags =
                        (MPI2_REQ_DESCRIPT_FLAGS_FP_IO <<
                                MEGASAS_REQ_DESCRIPT_FLAGS_TYPE_SHIFT);
        }
}

/**
 * megasas_build_io_fusion -    Prepares IOs to devices
 * @instance:           Adapter soft state
 * @scp:                SCSI command
 * @cmd:                Command to be prepared
 *
 * Invokes helper functions to prepare request frames
 * and sets flags appropriate for IO/Non-IO cmd
 */
int
megasas_build_io_fusion(struct megasas_instance *instance,
                        struct scsi_cmnd *scp,
                        struct megasas_cmd_fusion *cmd)
{
        u16 sge_count;
        u8  cmd_type;
        struct MPI2_RAID_SCSI_IO_REQUEST *io_request = cmd->io_request;

        /* Zero out some fields so they don't get reused */
        memset(io_request->LUN, 0x0, 8);
        io_request->CDB.EEDP32.PrimaryReferenceTag = 0;
        io_request->CDB.EEDP32.PrimaryApplicationTagMask = 0;
        io_request->EEDPFlags = 0;
        io_request->Control = 0;
        io_request->EEDPBlockSize = 0;
        io_request->ChainOffset = 0;
        io_request->RaidContext.RAIDFlags = 0;
        io_request->RaidContext.Type = 0;
        io_request->RaidContext.nseg = 0;

        memcpy(io_request->CDB.CDB32, scp->cmnd, scp->cmd_len);
        /*
         * Just the CDB length,rest of the Flags are zero
         * This will be modified for FP in build_ldio_fusion
         */
        io_request->IoFlags = cpu_to_le16(scp->cmd_len);

        switch (cmd_type = megasas_cmd_type(scp)) {
        case READ_WRITE_LDIO:
                megasas_build_ldio_fusion(instance, scp, cmd);
                break;
        case NON_READ_WRITE_LDIO:
                megasas_build_ld_nonrw_fusion(instance, scp, cmd);
                break;
        case READ_WRITE_SYSPDIO:
        case NON_READ_WRITE_SYSPDIO:
                if (instance->secure_jbod_support &&
                        (cmd_type == NON_READ_WRITE_SYSPDIO))
                        megasas_build_syspd_fusion(instance, scp, cmd, 0);
                else
                        megasas_build_syspd_fusion(instance, scp, cmd, 1);
                break;
        default:
                break;
        }

        /*
         * Construct SGL
         */

        sge_count =
                megasas_make_sgl_fusion(instance, scp,
                                        (struct MPI25_IEEE_SGE_CHAIN64 *)
                                        &io_request->SGL, cmd);

        if (sge_count > instance->max_num_sge) {
                dev_err(&instance->pdev->dev, "Error. sge_count (0x%x) exceeds "
                       "max (0x%x) allowed\n", sge_count,
                       instance->max_num_sge);
                return 1;
        }

        /* numSGE store lower 8 bit of sge_count.
         * numSGEExt store higher 8 bit of sge_count
         */
        io_request->RaidContext.numSGE = sge_count;
        io_request->RaidContext.numSGEExt = (u8)(sge_count >> 8);

        io_request->SGLFlags = cpu_to_le16(MPI2_SGE_FLAGS_64_BIT_ADDRESSING);

        if (scp->sc_data_direction == PCI_DMA_TODEVICE)
                io_request->Control |= cpu_to_le32(MPI2_SCSIIO_CONTROL_WRITE);
        else if (scp->sc_data_direction == PCI_DMA_FROMDEVICE)
                io_request->Control |= cpu_to_le32(MPI2_SCSIIO_CONTROL_READ);

        io_request->SGLOffset0 =
                offsetof(struct MPI2_RAID_SCSI_IO_REQUEST, SGL) / 4;

        io_request->SenseBufferLowAddress = cpu_to_le32(cmd->sense_phys_addr);
        io_request->SenseBufferLength = SCSI_SENSE_BUFFERSIZE;

        cmd->scmd = scp;
        scp->SCp.ptr = (char *)cmd;

        return 0;
}

union MEGASAS_REQUEST_DESCRIPTOR_UNION *
megasas_get_request_descriptor(struct megasas_instance *instance, u16 index)
{
        u8 *p;
        struct fusion_context *fusion;

        if (index >= instance->max_fw_cmds) {
                dev_err(&instance->pdev->dev, "Invalid SMID (0x%x)request for "
                       "descriptor for scsi%d\n", index,
                        instance->host->host_no);
                return NULL;
        }
        fusion = instance->ctrl_context;
        p = fusion->req_frames_desc
                +sizeof(union MEGASAS_REQUEST_DESCRIPTOR_UNION) *index;

        return (union MEGASAS_REQUEST_DESCRIPTOR_UNION *)p;
}

/**
 * megasas_build_and_issue_cmd_fusion -Main routine for building and
 *                                     issuing non IOCTL cmd
 * @instance:                   Adapter soft state
 * @scmd:                       pointer to scsi cmd from OS
 */
static u32
megasas_build_and_issue_cmd_fusion(struct megasas_instance *instance,
                                   struct scsi_cmnd *scmd)
{
        struct megasas_cmd_fusion *cmd;
        union MEGASAS_REQUEST_DESCRIPTOR_UNION *req_desc;
        u32 index;
        struct fusion_context *fusion;

        fusion = instance->ctrl_context;

        if ((megasas_cmd_type(scmd) == READ_WRITE_LDIO) &&
                instance->ldio_threshold &&
                (atomic_inc_return(&instance->ldio_outstanding) >
                instance->ldio_threshold)) {
                atomic_dec(&instance->ldio_outstanding);
                return SCSI_MLQUEUE_DEVICE_BUSY;
        }

        cmd = megasas_get_cmd_fusion(instance, scmd->request->tag);

        index = cmd->index;

        req_desc = megasas_get_request_descriptor(instance, index-1);
        if (!req_desc)
                return SCSI_MLQUEUE_HOST_BUSY;

        req_desc->Words = 0;
        cmd->request_desc = req_desc;

        if (megasas_build_io_fusion(instance, scmd, cmd)) {
                megasas_return_cmd_fusion(instance, cmd);
                dev_err(&instance->pdev->dev, "Error building command\n");
                cmd->request_desc = NULL;
                return SCSI_MLQUEUE_HOST_BUSY;
        }

        req_desc = cmd->request_desc;
        req_desc->SCSIIO.SMID = cpu_to_le16(index);

        if (cmd->io_request->ChainOffset != 0 &&
            cmd->io_request->ChainOffset != 0xF)
                dev_err(&instance->pdev->dev, "The chain offset value is not "
                       "correct : %x\n", cmd->io_request->ChainOffset);

        /*
         * Issue the command to the FW
         */
        atomic_inc(&instance->fw_outstanding);

        megasas_fire_cmd_fusion(instance, req_desc);

        return 0;
}

/**
 * complete_cmd_fusion -        Completes command
 * @instance:                   Adapter soft state
 * Completes all commands that is in reply descriptor queue
 */
int
complete_cmd_fusion(struct megasas_instance *instance, u32 MSIxIndex)
{
        union MPI2_REPLY_DESCRIPTORS_UNION *desc;
        struct MPI2_SCSI_IO_SUCCESS_REPLY_DESCRIPTOR *reply_desc;
        struct MPI2_RAID_SCSI_IO_REQUEST *scsi_io_req;
        struct fusion_context *fusion;
        struct megasas_cmd *cmd_mfi;
        struct megasas_cmd_fusion *cmd_fusion;
        u16 smid, num_completed;
        u8 reply_descript_type;
        u32 status, extStatus, device_id;
        union desc_value d_val;
        struct LD_LOAD_BALANCE_INFO *lbinfo;
        int threshold_reply_count = 0;
        struct scsi_cmnd *scmd_local = NULL;
        struct MR_TASK_MANAGE_REQUEST *mr_tm_req;
        struct MPI2_SCSI_TASK_MANAGE_REQUEST *mpi_tm_req;

        fusion = instance->ctrl_context;

        if (atomic_read(&instance->adprecovery) == MEGASAS_HW_CRITICAL_ERROR)
                return IRQ_HANDLED;

        desc = fusion->reply_frames_desc[MSIxIndex] +
                                fusion->last_reply_idx[MSIxIndex];

        reply_desc = (struct MPI2_SCSI_IO_SUCCESS_REPLY_DESCRIPTOR *)desc;

        d_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)
                return IRQ_NONE;

        num_completed = 0;

        while (d_val.u.low != cpu_to_le32(UINT_MAX) &&
               d_val.u.high != cpu_to_le32(UINT_MAX)) {
                smid = le16_to_cpu(reply_desc->SMID);

                cmd_fusion = fusion->cmd_list[smid - 1];

                scsi_io_req =
                        (struct MPI2_RAID_SCSI_IO_REQUEST *)
                  cmd_fusion->io_request;

                if (cmd_fusion->scmd)
                        cmd_fusion->scmd->SCp.ptr = NULL;

                scmd_local = cmd_fusion->scmd;
                status = scsi_io_req->RaidContext.status;
                extStatus = scsi_io_req->RaidContext.exStatus;

                switch (scsi_io_req->Function) {
                case MPI2_FUNCTION_SCSI_TASK_MGMT:
                        mr_tm_req = (struct MR_TASK_MANAGE_REQUEST *)
                                                cmd_fusion->io_request;
                        mpi_tm_req = (struct MPI2_SCSI_TASK_MANAGE_REQUEST *)
                                                &mr_tm_req->TmRequest;
                        dev_dbg(&instance->pdev->dev, "TM completion:"
                                "type: 0x%x TaskMID: 0x%x\n",
                                mpi_tm_req->TaskType, mpi_tm_req->TaskMID);
                        complete(&cmd_fusion->done);
                        break;
                case MPI2_FUNCTION_SCSI_IO_REQUEST:  /*Fast Path IO.*/
                        /* Update load balancing info */
                        device_id = MEGASAS_DEV_INDEX(scmd_local);
                        lbinfo = &fusion->load_balance_info[device_id];
                        if (cmd_fusion->scmd->SCp.Status &
                            MEGASAS_LOAD_BALANCE_FLAG) {
                                atomic_dec(&lbinfo->scsi_pending_cmds[cmd_fusion->pd_r1_lb]);
                                cmd_fusion->scmd->SCp.Status &=
                                        ~MEGASAS_LOAD_BALANCE_FLAG;
                        }
                        if (reply_descript_type ==
                            MPI2_RPY_DESCRIPT_FLAGS_SCSI_IO_SUCCESS) {
                                if (megasas_dbg_lvl == 5)
                                        dev_err(&instance->pdev->dev, "\nFAST Path "
                                               "IO Success\n");
                        }
                        /* Fall thru and complete IO */
                case MEGASAS_MPI2_FUNCTION_LD_IO_REQUEST: /* LD-IO Path */
                        /* Map the FW Cmd Status */
                        map_cmd_status(cmd_fusion, status, extStatus);
                        scsi_io_req->RaidContext.status = 0;
                        scsi_io_req->RaidContext.exStatus = 0;
                        if (megasas_cmd_type(scmd_local) == READ_WRITE_LDIO)
                                atomic_dec(&instance->ldio_outstanding);
                        megasas_return_cmd_fusion(instance, cmd_fusion);
                        scsi_dma_unmap(scmd_local);
                        scmd_local->scsi_done(scmd_local);
                        atomic_dec(&instance->fw_outstanding);

                        break;
                case MEGASAS_MPI2_FUNCTION_PASSTHRU_IO_REQUEST: /*MFI command */
                        cmd_mfi = instance->cmd_list[cmd_fusion->sync_cmd_idx];

                        /* Poll mode. Dummy free.
                         * In case of Interrupt mode, caller has reverse check.
                         */
                        if (cmd_mfi->flags & DRV_DCMD_POLLED_MODE) {
                                cmd_mfi->flags &= ~DRV_DCMD_POLLED_MODE;
                                megasas_return_cmd(instance, cmd_mfi);
                        } else
                                megasas_complete_cmd(instance, cmd_mfi, DID_OK);
                        break;
                }

                fusion->last_reply_idx[MSIxIndex]++;
                if (fusion->last_reply_idx[MSIxIndex] >=
                    fusion->reply_q_depth)
                        fusion->last_reply_idx[MSIxIndex] = 0;

                desc->Words = cpu_to_le64(ULLONG_MAX);
                num_completed++;
                threshold_reply_count++;

                /* Get the next reply descriptor */
                if (!fusion->last_reply_idx[MSIxIndex])
                        desc = fusion->reply_frames_desc[MSIxIndex];
                else
                        desc++;

                reply_desc =
                  (struct MPI2_SCSI_IO_SUCCESS_REPLY_DESCRIPTOR *)desc;

                d_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 host index register after completing threshold
                 * number of reply counts and still there are more replies in reply queue
                 * pending to be completed
                 */
                if (threshold_reply_count >= THRESHOLD_REPLY_COUNT) {
                        if (fusion->adapter_type == INVADER_SERIES)
                                writel(((MSIxIndex & 0x7) << 24) |
                                        fusion->last_reply_idx[MSIxIndex],
                                        instance->reply_post_host_index_addr[MSIxIndex/8]);
                        else
                                writel((MSIxIndex << 24) |
                                        fusion->last_reply_idx[MSIxIndex],
                                        instance->reply_post_host_index_addr[0]);
                        threshold_reply_count = 0;
                }
        }

        if (!num_completed)
                return IRQ_NONE;

        wmb();
        if (fusion->adapter_type == INVADER_SERIES)
                writel(((MSIxIndex & 0x7) << 24) |
                        fusion->last_reply_idx[MSIxIndex],
                        instance->reply_post_host_index_addr[MSIxIndex/8]);
        else
                writel((MSIxIndex << 24) |
                        fusion->last_reply_idx[MSIxIndex],
                        instance->reply_post_host_index_addr[0]);
        megasas_check_and_restore_queue_depth(instance);
        return IRQ_HANDLED;
}

/**
 * megasas_complete_cmd_dpc_fusion -    Completes command
 * @instance:                   Adapter soft state
 *
 * Tasklet to complete cmds
 */
void
megasas_complete_cmd_dpc_fusion(unsigned long instance_addr)
{
        struct megasas_instance *instance =
                (struct megasas_instance *)instance_addr;
        unsigned long flags;
        u32 count, MSIxIndex;

        count = instance->msix_vectors > 0 ? instance->msix_vectors : 1;

        /* If we have already declared adapter dead, donot complete cmds */
        spin_lock_irqsave(&instance->hba_lock, flags);
        if (atomic_read(&instance->adprecovery) == MEGASAS_HW_CRITICAL_ERROR) {
                spin_unlock_irqrestore(&instance->hba_lock, flags);
                return;
        }
        spin_unlock_irqrestore(&instance->hba_lock, flags);

        for (MSIxIndex = 0 ; MSIxIndex < count; MSIxIndex++)
                complete_cmd_fusion(instance, MSIxIndex);
}

/**
 * megasas_isr_fusion - isr entry point
 */
irqreturn_t megasas_isr_fusion(int irq, void *devp)
{
        struct megasas_irq_context *irq_context = devp;
        struct megasas_instance *instance = irq_context->instance;
        u32 mfiStatus, fw_state, dma_state;

        if (instance->mask_interrupts)
                return IRQ_NONE;

        if (!instance->msix_vectors) {
                mfiStatus = instance->instancet->clear_intr(instance->reg_set);
                if (!mfiStatus)
                        return IRQ_NONE;
        }

        /* If we are resetting, bail */
        if (test_bit(MEGASAS_FUSION_IN_RESET, &instance->reset_flags)) {
                instance->instancet->clear_intr(instance->reg_set);
                return IRQ_HANDLED;
        }

        if (!complete_cmd_fusion(instance, irq_context->MSIxIndex)) {
                instance->instancet->clear_intr(instance->reg_set);
                /* If we didn't complete any commands, check for FW fault */
                fw_state = instance->instancet->read_fw_status_reg(
                        instance->reg_set) & MFI_STATE_MASK;
                dma_state = instance->instancet->read_fw_status_reg
                        (instance->reg_set) & MFI_STATE_DMADONE;
                if (instance->crash_dump_drv_support &&
                        instance->crash_dump_app_support) {
                        /* Start collecting crash, if DMA bit is done */
                        if ((fw_state == MFI_STATE_FAULT) && dma_state)
                                schedule_work(&instance->crash_init);
                        else if (fw_state == MFI_STATE_FAULT)
                                schedule_work(&instance->work_init);
                } else if (fw_state == MFI_STATE_FAULT) {
                        dev_warn(&instance->pdev->dev, "Iop2SysDoorbellInt"
                               "for scsi%d\n", instance->host->host_no);
                        schedule_work(&instance->work_init);
                }
        }

        return IRQ_HANDLED;
}

/**
 * build_mpt_mfi_pass_thru - builds a cmd fo MFI Pass thru
 * @instance:                   Adapter soft state
 * mfi_cmd:                     megasas_cmd pointer
 *
 */
u8
build_mpt_mfi_pass_thru(struct megasas_instance *instance,
                        struct megasas_cmd *mfi_cmd)
{
        struct MPI25_IEEE_SGE_CHAIN64 *mpi25_ieee_chain;
        struct MPI2_RAID_SCSI_IO_REQUEST *io_req;
        struct megasas_cmd_fusion *cmd;
        struct fusion_context *fusion;
        struct megasas_header *frame_hdr = &mfi_cmd->frame->hdr;

        fusion = instance->ctrl_context;

        cmd = megasas_get_cmd_fusion(instance,
                        instance->max_scsi_cmds + mfi_cmd->index);

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

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

        if (frame_hdr->flags & cpu_to_le16(MFI_FRAME_DONT_POST_IN_REPLY_QUEUE))
                mfi_cmd->flags |= DRV_DCMD_POLLED_MODE;

        io_req = cmd->io_request;

        if (fusion->adapter_type == INVADER_SERIES) {
                struct MPI25_IEEE_SGE_CHAIN64 *sgl_ptr_end =
                        (struct MPI25_IEEE_SGE_CHAIN64 *)&io_req->SGL;
                sgl_ptr_end += fusion->max_sge_in_main_msg - 1;
                sgl_ptr_end->Flags = 0;
        }

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

        io_req->Function    = MEGASAS_MPI2_FUNCTION_PASSTHRU_IO_REQUEST;
        io_req->SGLOffset0  = offsetof(struct MPI2_RAID_SCSI_IO_REQUEST,
                                       SGL) / 4;
        io_req->ChainOffset = fusion->chain_offset_mfi_pthru;

        mpi25_ieee_chain->Address = cpu_to_le64(mfi_cmd->frame_phys_addr);

        mpi25_ieee_chain->Flags = IEEE_SGE_FLAGS_CHAIN_ELEMENT |
                MPI2_IEEE_SGE_FLAGS_IOCPLBNTA_ADDR;

        mpi25_ieee_chain->Length = cpu_to_le32(instance->max_chain_frame_sz);

        return 0;
}

/**
 * build_mpt_cmd - Calls helper function to build a cmd MFI Pass thru cmd
 * @instance:                   Adapter soft state
 * @cmd:                        mfi cmd to build
 *
 */
union MEGASAS_REQUEST_DESCRIPTOR_UNION *
build_mpt_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd)
{
        union MEGASAS_REQUEST_DESCRIPTOR_UNION *req_desc;
        u16 index;

        if (build_mpt_mfi_pass_thru(instance, cmd)) {
                dev_err(&instance->pdev->dev, "Couldn't build MFI pass thru cmd\n");
                return NULL;
        }

        index = cmd->context.smid;

        req_desc = megasas_get_request_descriptor(instance, index - 1);

        if (!req_desc)
                return NULL;

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

        req_desc->SCSIIO.SMID = cpu_to_le16(index);

        return req_desc;
}

/**
 * megasas_issue_dcmd_fusion - Issues a MFI Pass thru cmd
 * @instance:                   Adapter soft state
 * @cmd:                        mfi cmd pointer
 *
 */
int
megasas_issue_dcmd_fusion(struct megasas_instance *instance,
                          struct megasas_cmd *cmd)
{
        union MEGASAS_REQUEST_DESCRIPTOR_UNION *req_desc;

        req_desc = build_mpt_cmd(instance, cmd);
        if (!req_desc) {
                dev_info(&instance->pdev->dev, "Failed from %s %d\n",
                                        __func__, __LINE__);
                return DCMD_NOT_FIRED;
        }

        megasas_fire_cmd_fusion(instance, req_desc);
        return DCMD_SUCCESS;
}

/**
 * megasas_release_fusion -     Reverses the FW initialization
 * @instance:                   Adapter soft state
 */
void
megasas_release_fusion(struct megasas_instance *instance)
{
        megasas_free_cmds(instance);
        megasas_free_cmds_fusion(instance);

        iounmap(instance->reg_set);

        pci_release_selected_regions(instance->pdev, 1<<instance->bar);
}

/**
 * megasas_read_fw_status_reg_fusion - returns the current FW status value
 * @regs:                       MFI register set
 */
static u32
megasas_read_fw_status_reg_fusion(struct megasas_register_set __iomem *regs)
{
        return readl(&(regs)->outbound_scratch_pad);
}

/**
 * megasas_alloc_host_crash_buffer -    Host buffers for Crash dump collection from Firmware
 * @instance:                           Controller's soft instance
 * return:                              Number of allocated host crash buffers
 */
static void
megasas_alloc_host_crash_buffer(struct megasas_instance *instance)
{
        unsigned int i;

        instance->crash_buf_pages = get_order(CRASH_DMA_BUF_SIZE);
        for (i = 0; i < MAX_CRASH_DUMP_SIZE; i++) {
                instance->crash_buf[i] = (void  *)__get_free_pages(GFP_KERNEL,
                                instance->crash_buf_pages);
                if (!instance->crash_buf[i]) {
                        dev_info(&instance->pdev->dev, "Firmware crash dump "
                                "memory allocation failed at index %d\n", i);
                        break;
                }
                memset(instance->crash_buf[i], 0,
                        ((1 << PAGE_SHIFT) << instance->crash_buf_pages));
        }
        instance->drv_buf_alloc = i;
}

/**
 * megasas_free_host_crash_buffer -     Host buffers for Crash dump collection from Firmware
 * @instance:                           Controller's soft instance
 */
void
megasas_free_host_crash_buffer(struct megasas_instance *instance)
{
        unsigned int i
;
        for (i = 0; i < instance->drv_buf_alloc; i++) {
                if (instance->crash_buf[i])
                        free_pages((ulong)instance->crash_buf[i],
                                        instance->crash_buf_pages);
        }
        instance->drv_buf_index = 0;
        instance->drv_buf_alloc = 0;
        instance->fw_crash_state = UNAVAILABLE;
        instance->fw_crash_buffer_size = 0;
}

/**
 * megasas_adp_reset_fusion -   For controller reset
 * @regs:                               MFI register set
 */
static int
megasas_adp_reset_fusion(struct megasas_instance *instance,
                         struct megasas_register_set __iomem *regs)
{
        u32 host_diag, abs_state, retry;

        /* Now try to reset the chip */
        writel(MPI2_WRSEQ_FLUSH_KEY_VALUE, &instance->reg_set->fusion_seq_offset);
        writel(MPI2_WRSEQ_1ST_KEY_VALUE, &instance->reg_set->fusion_seq_offset);
        writel(MPI2_WRSEQ_2ND_KEY_VALUE, &instance->reg_set->fusion_seq_offset);
        writel(MPI2_WRSEQ_3RD_KEY_VALUE, &instance->reg_set->fusion_seq_offset);
        writel(MPI2_WRSEQ_4TH_KEY_VALUE, &instance->reg_set->fusion_seq_offset);
        writel(MPI2_WRSEQ_5TH_KEY_VALUE, &instance->reg_set->fusion_seq_offset);
        writel(MPI2_WRSEQ_6TH_KEY_VALUE, &instance->reg_set->fusion_seq_offset);

        /* Check that the diag write enable (DRWE) bit is on */
        host_diag = readl(&instance->reg_set->fusion_host_diag);
        retry = 0;
        while (!(host_diag & HOST_DIAG_WRITE_ENABLE)) {
                msleep(100);
                host_diag = readl(&instance->reg_set->fusion_host_diag);
                if (retry++ == 100) {
                        dev_warn(&instance->pdev->dev,
                                "Host diag unlock failed from %s %d\n",
                                __func__, __LINE__);
                        break;
                }
        }
        if (!(host_diag & HOST_DIAG_WRITE_ENABLE))
                return -1;

        /* Send chip reset command */
        writel(host_diag | HOST_DIAG_RESET_ADAPTER,
                &instance->reg_set->fusion_host_diag);
        msleep(3000);

        /* Make sure reset adapter bit is cleared */
        host_diag = readl(&instance->reg_set->fusion_host_diag);
        retry = 0;
        while (host_diag & HOST_DIAG_RESET_ADAPTER) {
                msleep(100);
                host_diag = readl(&instance->reg_set->fusion_host_diag);
                if (retry++ == 1000) {
                        dev_warn(&instance->pdev->dev,
                                "Diag reset adapter never cleared %s %d\n",
                                __func__, __LINE__);
                        break;
                }
        }
        if (host_diag & HOST_DIAG_RESET_ADAPTER)
                return -1;

        abs_state = instance->instancet->read_fw_status_reg(instance->reg_set)
                        & MFI_STATE_MASK;
        retry = 0;

        while ((abs_state <= MFI_STATE_FW_INIT) && (retry++ < 1000)) {
                msleep(100);
                abs_state = instance->instancet->
                        read_fw_status_reg(instance->reg_set) & MFI_STATE_MASK;
        }
        if (abs_state <= MFI_STATE_FW_INIT) {
                dev_warn(&instance->pdev->dev,
                        "fw state < MFI_STATE_FW_INIT, state = 0x%x %s %d\n",
                        abs_state, __func__, __LINE__);
                return -1;
        }

        return 0;
}

/**
 * megasas_check_reset_fusion - For controller reset check
 * @regs:                               MFI register set
 */
static int
megasas_check_reset_fusion(struct megasas_instance *instance,
                           struct megasas_register_set __iomem *regs)
{
        return 0;
}

/* This function waits for outstanding commands on fusion to complete */
int megasas_wait_for_outstanding_fusion(struct megasas_instance *instance,
                                        int reason, int *convert)
{
        int i, outstanding, retval = 0, hb_seconds_missed = 0;
        u32 fw_state;

        for (i = 0; i < resetwaittime; i++) {
                /* Check if firmware is in fault state */
                fw_state = instance->instancet->read_fw_status_reg(
                        instance->reg_set) & MFI_STATE_MASK;
                if (fw_state == MFI_STATE_FAULT) {
                        dev_warn(&instance->pdev->dev, "Found FW in FAULT state,"
                               " will reset adapter scsi%d.\n",
                                instance->host->host_no);
                        megasas_complete_cmd_dpc_fusion((unsigned long)instance);
                        retval = 1;
                        goto out;
                }

                if (reason == MFI_IO_TIMEOUT_OCR) {
                        dev_info(&instance->pdev->dev,
                                "MFI IO is timed out, initiating OCR\n");
                        megasas_complete_cmd_dpc_fusion((unsigned long)instance);
                        retval = 1;
                        goto out;
                }

                /* If SR-IOV VF mode & heartbeat timeout, don't wait */
                if (instance->requestorId && !reason) {
                        retval = 1;
                        goto out;
                }

                /* If SR-IOV VF mode & I/O timeout, check for HB timeout */
                if (instance->requestorId && reason) {
                        if (instance->hb_host_mem->HB.fwCounter !=
                            instance->hb_host_mem->HB.driverCounter) {
                                instance->hb_host_mem->HB.driverCounter =
                                        instance->hb_host_mem->HB.fwCounter;
                                hb_seconds_missed = 0;
                        } else {
                                hb_seconds_missed++;
                                if (hb_seconds_missed ==
                                    (MEGASAS_SRIOV_HEARTBEAT_INTERVAL_VF/HZ)) {
                                        dev_warn(&instance->pdev->dev, "SR-IOV:"
                                               " Heartbeat never completed "
                                               " while polling during I/O "
                                               " timeout handling for "
                                               "scsi%d.\n",
                                               instance->host->host_no);
                                               *convert = 1;
                                               retval = 1;
                                               goto out;
                                }
                        }
                }

                outstanding = atomic_read(&instance->fw_outstanding);
                if (!outstanding)
                        goto out;

                if (!(i % MEGASAS_RESET_NOTICE_INTERVAL)) {
                        dev_notice(&instance->pdev->dev, "[%2d]waiting for %d "
                               "commands to complete for scsi%d\n", i,
                               outstanding, instance->host->host_no);
                        megasas_complete_cmd_dpc_fusion(
                                (unsigned long)instance);
                }
                msleep(1000);
        }

        if (atomic_read(&instance->fw_outstanding)) {
                dev_err(&instance->pdev->dev, "pending commands remain after waiting, "
                       "will reset adapter scsi%d.\n",
                       instance->host->host_no);
                retval = 1;
        }
out:
        return retval;
}

void  megasas_reset_reply_desc(struct megasas_instance *instance)
{
        int i, j, count;
        struct fusion_context *fusion;
        union MPI2_REPLY_DESCRIPTORS_UNION *reply_desc;

        fusion = instance->ctrl_context;
        count = instance->msix_vectors > 0 ? instance->msix_vectors : 1;
        for (i = 0 ; i < count ; i++) {
                fusion->last_reply_idx[i] = 0;
                reply_desc = fusion->reply_frames_desc[i];
                for (j = 0 ; j < fusion->reply_q_depth; j++, reply_desc++)
                        reply_desc->Words = cpu_to_le64(ULLONG_MAX);
        }
}

/*
 * megasas_refire_mgmt_cmd :    Re-fire management commands
 * @instance:                           Controller's soft instance
*/
void megasas_refire_mgmt_cmd(struct megasas_instance *instance)
{
        int j;
        struct megasas_cmd_fusion *cmd_fusion;
        struct fusion_context *fusion;
        struct megasas_cmd *cmd_mfi;
        union MEGASAS_REQUEST_DESCRIPTOR_UNION *req_desc;
        u16 smid;
        bool refire_cmd = 0;

        fusion = instance->ctrl_context;

        /* Re-fire management commands.
         * Do not traverse complet MPT frame pool. Start from max_scsi_cmds.
         */
        for (j = instance->max_scsi_cmds ; j < instance->max_fw_cmds; j++) {
                cmd_fusion = fusion->cmd_list[j];
                cmd_mfi = instance->cmd_list[cmd_fusion->sync_cmd_idx];
                smid = le16_to_cpu(cmd_mfi->context.smid);

                if (!smid)
                        continue;
                req_desc = megasas_get_request_descriptor
                                        (instance, smid - 1);
                refire_cmd = req_desc && ((cmd_mfi->frame->dcmd.opcode !=
                                cpu_to_le32(MR_DCMD_LD_MAP_GET_INFO)) &&
                                 (cmd_mfi->frame->dcmd.opcode !=
                                cpu_to_le32(MR_DCMD_SYSTEM_PD_MAP_GET_INFO)))
                                && !(cmd_mfi->flags & DRV_DCMD_SKIP_REFIRE);
                if (refire_cmd)
                        megasas_fire_cmd_fusion(instance, req_desc);
                else
                        megasas_return_cmd(instance, cmd_mfi);
        }
}

/*
 * megasas_track_scsiio : Track SCSI IOs outstanding to a SCSI device
 * @instance: per adapter struct
 * @channel: the channel assigned by the OS
 * @id: the id assigned by the OS
 *
 * Returns SUCCESS if no IOs pending to SCSI device, else return FAILED
 */

static int megasas_track_scsiio(struct megasas_instance *instance,
                int id, int channel)
{
        int i, found = 0;
        struct megasas_cmd_fusion *cmd_fusion;
        struct fusion_context *fusion;
        fusion = instance->ctrl_context;

        for (i = 0 ; i < instance->max_scsi_cmds; i++) {
                cmd_fusion = fusion->cmd_list[i];
                if (cmd_fusion->scmd &&
                        (cmd_fusion->scmd->device->id == id &&
                        cmd_fusion->scmd->device->channel == channel)) {
                        dev_info(&instance->pdev->dev,
                                "SCSI commands pending to target"
                                "channel %d id %d \tSMID: 0x%x\n",
                                channel, id, cmd_fusion->index);
                        scsi_print_command(cmd_fusion->scmd);
                        found = 1;
                        break;
                }
        }

        return found ? FAILED : SUCCESS;
}

/**
 * megasas_tm_response_code - translation of device response code
 * @ioc: per adapter object
 * @mpi_reply: MPI reply returned by firmware
 *
 * Return nothing.
 */
static void
megasas_tm_response_code(struct megasas_instance *instance,
                struct MPI2_SCSI_TASK_MANAGE_REPLY *mpi_reply)
{
        char *desc;

        switch (mpi_reply->ResponseCode) {
        case MPI2_SCSITASKMGMT_RSP_TM_COMPLETE:
                desc = "task management request completed";
                break;
        case MPI2_SCSITASKMGMT_RSP_INVALID_FRAME:
                desc = "invalid frame";
                break;
        case MPI2_SCSITASKMGMT_RSP_TM_NOT_SUPPORTED:
                desc = "task management request not supported";
                break;
        case MPI2_SCSITASKMGMT_RSP_TM_FAILED:
                desc = "task management request failed";
                break;
        case MPI2_SCSITASKMGMT_RSP_TM_SUCCEEDED:
                desc = "task management request succeeded";
                break;
        case MPI2_SCSITASKMGMT_RSP_TM_INVALID_LUN:
                desc = "invalid lun";
                break;
        case 0xA:
                desc = "overlapped tag attempted";
                break;
        case MPI2_SCSITASKMGMT_RSP_IO_QUEUED_ON_IOC:
                desc = "task queued, however not sent to target";
                break;
        default:
                desc = "unknown";
                break;
        }
        dev_dbg(&instance->pdev->dev, "response_code(%01x): %s\n",
                mpi_reply->ResponseCode, desc);
        dev_dbg(&instance->pdev->dev,
                "TerminationCount/DevHandle/Function/TaskType/IOCStat/IOCLoginfo"
                " 0x%x/0x%x/0x%x/0x%x/0x%x/0x%x\n",
                mpi_reply->TerminationCount, mpi_reply->DevHandle,
                mpi_reply->Function, mpi_reply->TaskType,
                mpi_reply->IOCStatus, mpi_reply->IOCLogInfo);
}

/**
 * megasas_issue_tm - main routine for sending tm requests
 * @instance: per adapter struct
 * @device_handle: device handle
 * @channel: the channel assigned by the OS
 * @id: the id assigned by the OS
 * @type: MPI2_SCSITASKMGMT_TASKTYPE__XXX (defined in megaraid_sas_fusion.c)
 * @smid_task: smid assigned to the task
 * @m_type: TM_MUTEX_ON or TM_MUTEX_OFF
 * Context: user
 *
 * MegaRaid use MPT interface for Task Magement request.
 * A generic API for sending task management requests to firmware.
 *
 * Return SUCCESS or FAILED.
 */
static int
megasas_issue_tm(struct megasas_instance *instance, u16 device_handle,
        uint channel, uint id, u16 smid_task, u8 type)
{
        struct MR_TASK_MANAGE_REQUEST *mr_request;
        struct MPI2_SCSI_TASK_MANAGE_REQUEST *mpi_request;
        unsigned long timeleft;
        struct megasas_cmd_fusion *cmd_fusion;
        struct megasas_cmd *cmd_mfi;
        union MEGASAS_REQUEST_DESCRIPTOR_UNION *req_desc;