/*
 *  Linux MegaRAID driver for SAS based RAID controllers
 *
 *  Copyright (c) 2003-2013  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/>.
 *
 *  Authors: Avago Technologies
 *           Sreenivas Bagalkote
 *           Sumant Patro
 *           Bo Yang
 *           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/slab.h>
#include <asm/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_tcq.h>
#include "megaraid_sas_fusion.h"
#include "megaraid_sas.h"

/*
 * Number of sectors per IO command
 * Will be set in megasas_init_mfi if user does not provide
 */
static unsigned int max_sectors;
module_param_named(max_sectors, max_sectors, int, 0);
MODULE_PARM_DESC(max_sectors,
        "Maximum number of sectors per IO command");

static int msix_disable;
module_param(msix_disable, int, S_IRUGO);
MODULE_PARM_DESC(msix_disable, "Disable MSI-X interrupt handling. Default: 0");

static unsigned int msix_vectors;
module_param(msix_vectors, int, S_IRUGO);
MODULE_PARM_DESC(msix_vectors, "MSI-X max vector count. Default: Set by FW");

static int allow_vf_ioctls;
module_param(allow_vf_ioctls, int, S_IRUGO);
MODULE_PARM_DESC(allow_vf_ioctls, "Allow ioctls in SR-IOV VF mode. Default: 0");

static unsigned int throttlequeuedepth = MEGASAS_THROTTLE_QUEUE_DEPTH;
module_param(throttlequeuedepth, int, S_IRUGO);
MODULE_PARM_DESC(throttlequeuedepth,
        "Adapter queue depth when throttled due to I/O timeout. Default: 16");

unsigned int resetwaittime = MEGASAS_RESET_WAIT_TIME;
module_param(resetwaittime, int, S_IRUGO);
MODULE_PARM_DESC(resetwaittime, "Wait time in seconds after I/O timeout "
                 "before resetting adapter. Default: 180");

int smp_affinity_enable = 1;
module_param(smp_affinity_enable, int, S_IRUGO);
MODULE_PARM_DESC(smp_affinity_enable, "SMP affinity feature enable/disbale Default: enable(1)");

int rdpq_enable = 1;
module_param(rdpq_enable, int, S_IRUGO);
MODULE_PARM_DESC(rdpq_enable, " Allocate reply queue in chunks for large queue depth enable/disable Default: disable(0)");

unsigned int dual_qdepth_disable;
module_param(dual_qdepth_disable, int, S_IRUGO);
MODULE_PARM_DESC(dual_qdepth_disable, "Disable dual queue depth feature. Default: 0");

unsigned int scmd_timeout = MEGASAS_DEFAULT_CMD_TIMEOUT;
module_param(scmd_timeout, int, S_IRUGO);
MODULE_PARM_DESC(scmd_timeout, "scsi command timeout (10-90s), default 90s. See megasas_reset_timer.");

MODULE_LICENSE("GPL");
MODULE_VERSION(MEGASAS_VERSION);
MODULE_AUTHOR("megaraidlinux.pdl@avagotech.com");
MODULE_DESCRIPTION("Avago MegaRAID SAS Driver");

int megasas_transition_to_ready(struct megasas_instance *instance, int ocr);
static int megasas_get_pd_list(struct megasas_instance *instance);
static int megasas_ld_list_query(struct megasas_instance *instance,
                                 u8 query_type);
static int megasas_issue_init_mfi(struct megasas_instance *instance);
static int megasas_register_aen(struct megasas_instance *instance,
                                u32 seq_num, u32 class_locale_word);
static int
megasas_get_pd_info(struct megasas_instance *instance, u16 device_id);
/*
 * PCI ID table for all supported controllers
 */
static struct pci_device_id megasas_pci_table[] = {

        {PCI_DEVICE(PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_SAS1064R)},
        /* xscale IOP */
        {PCI_DEVICE(PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_SAS1078R)},
        /* ppc IOP */
        {PCI_DEVICE(PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_SAS1078DE)},
        /* ppc IOP */
        {PCI_DEVICE(PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_SAS1078GEN2)},
        /* gen2*/
        {PCI_DEVICE(PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_SAS0079GEN2)},
        /* gen2*/
        {PCI_DEVICE(PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_SAS0073SKINNY)},
        /* skinny*/
        {PCI_DEVICE(PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_SAS0071SKINNY)},
        /* skinny*/
        {PCI_DEVICE(PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_VERDE_ZCR)},
        /* xscale IOP, vega */
        {PCI_DEVICE(PCI_VENDOR_ID_DELL, PCI_DEVICE_ID_DELL_PERC5)},
        /* xscale IOP */
        {PCI_DEVICE(PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_FUSION)},
        /* Fusion */
        {PCI_DEVICE(PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_PLASMA)},
        /* Plasma */
        {PCI_DEVICE(PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_INVADER)},
        /* Invader */
        {PCI_DEVICE(PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_FURY)},
        /* Fury */
        {PCI_DEVICE(PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_INTRUDER)},
        /* Intruder */
        {PCI_DEVICE(PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_INTRUDER_24)},
        /* Intruder 24 port*/
        {PCI_DEVICE(PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_CUTLASS_52)},
        {PCI_DEVICE(PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_CUTLASS_53)},
        {}
};

MODULE_DEVICE_TABLE(pci, megasas_pci_table);

static int megasas_mgmt_majorno;
struct megasas_mgmt_info megasas_mgmt_info;
static struct fasync_struct *megasas_async_queue;
static DEFINE_MUTEX(megasas_async_queue_mutex);

static int megasas_poll_wait_aen;
static DECLARE_WAIT_QUEUE_HEAD(megasas_poll_wait);
static u32 support_poll_for_event;
u32 megasas_dbg_lvl;
static u32 support_device_change;

/* define lock for aen poll */
spinlock_t poll_aen_lock;

void
megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
                     u8 alt_status);
static u32
megasas_read_fw_status_reg_gen2(struct megasas_register_set __iomem *regs);
static int
megasas_adp_reset_gen2(struct megasas_instance *instance,
                       struct megasas_register_set __iomem *reg_set);
static irqreturn_t megasas_isr(int irq, void *devp);
static u32
megasas_init_adapter_mfi(struct megasas_instance *instance);
u32
megasas_build_and_issue_cmd(struct megasas_instance *instance,
                            struct scsi_cmnd *scmd);
static void megasas_complete_cmd_dpc(unsigned long instance_addr);
void
megasas_release_fusion(struct megasas_instance *instance);
int
megasas_ioc_init_fusion(struct megasas_instance *instance);
void
megasas_free_cmds_fusion(struct megasas_instance *instance);
u8
megasas_get_map_info(struct megasas_instance *instance);
int
megasas_sync_map_info(struct megasas_instance *instance);
int
wait_and_poll(struct megasas_instance *instance, struct megasas_cmd *cmd,
        int seconds);
void megasas_reset_reply_desc(struct megasas_instance *instance);
void megasas_fusion_ocr_wq(struct work_struct *work);
static int megasas_get_ld_vf_affiliation(struct megasas_instance *instance,
                                         int initial);
int megasas_check_mpio_paths(struct megasas_instance *instance,
                             struct scsi_cmnd *scmd);

int
megasas_issue_dcmd(struct megasas_instance *instance, struct megasas_cmd *cmd)
{
        instance->instancet->fire_cmd(instance,
                cmd->frame_phys_addr, 0, instance->reg_set);
        return 0;
}

/**
 * megasas_get_cmd -    Get a command from the free pool
 * @instance:           Adapter soft state
 *
 * Returns a free command from the pool
 */
struct megasas_cmd *megasas_get_cmd(struct megasas_instance
                                                  *instance)
{
        unsigned long flags;
        struct megasas_cmd *cmd = NULL;

        spin_lock_irqsave(&instance->mfi_pool_lock, flags);

        if (!list_empty(&instance->cmd_pool)) {
                cmd = list_entry((&instance->cmd_pool)->next,
                                 struct megasas_cmd, list);
                list_del_init(&cmd->list);
        } else {
                dev_err(&instance->pdev->dev, "Command pool empty!\n");
        }

        spin_unlock_irqrestore(&instance->mfi_pool_lock, flags);
        return cmd;
}

/**
 * megasas_return_cmd - 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(struct megasas_instance *instance, struct megasas_cmd *cmd)
{
        unsigned long flags;
        u32 blk_tags;
        struct megasas_cmd_fusion *cmd_fusion;
        struct fusion_context *fusion = instance->ctrl_context;

        /* This flag is used only for fusion adapter.
         * Wait for Interrupt for Polled mode DCMD
         */
        if (cmd->flags & DRV_DCMD_POLLED_MODE)
                return;

        spin_lock_irqsave(&instance->mfi_pool_lock, flags);

        if (fusion) {
                blk_tags = instance->max_scsi_cmds + cmd->index;
                cmd_fusion = fusion->cmd_list[blk_tags];
                megasas_return_cmd_fusion(instance, cmd_fusion);
        }
        cmd->scmd = NULL;
        cmd->frame_count = 0;
        cmd->flags = 0;
        if (!fusion && reset_devices)
                cmd->frame->hdr.cmd = MFI_CMD_INVALID;
        list_add(&cmd->list, (&instance->cmd_pool)->next);

        spin_unlock_irqrestore(&instance->mfi_pool_lock, flags);

}

static const char *
format_timestamp(uint32_t timestamp)
{
        static char buffer[32];

        if ((timestamp & 0xff000000) == 0xff000000)
                snprintf(buffer, sizeof(buffer), "boot + %us", timestamp &
                0x00ffffff);
        else
                snprintf(buffer, sizeof(buffer), "%us", timestamp);
        return buffer;
}

static const char *
format_class(int8_t class)
{
        static char buffer[6];

        switch (class) {
        case MFI_EVT_CLASS_DEBUG:
                return "debug";
        case MFI_EVT_CLASS_PROGRESS:
                return "progress";
        case MFI_EVT_CLASS_INFO:
                return "info";
        case MFI_EVT_CLASS_WARNING:
                return "WARN";
        case MFI_EVT_CLASS_CRITICAL:
                return "CRIT";
        case MFI_EVT_CLASS_FATAL:
                return "FATAL";
        case MFI_EVT_CLASS_DEAD:
                return "DEAD";
        default:
                snprintf(buffer, sizeof(buffer), "%d", class);
                return buffer;
        }
}

/**
  * megasas_decode_evt: Decode FW AEN event and print critical event
  * for information.
  * @instance:                  Adapter soft state
  */
static void
megasas_decode_evt(struct megasas_instance *instance)
{
        struct megasas_evt_detail *evt_detail = instance->evt_detail;
        union megasas_evt_class_locale class_locale;
        class_locale.word = le32_to_cpu(evt_detail->cl.word);

        if (class_locale.members.class >= MFI_EVT_CLASS_CRITICAL)
                dev_info(&instance->pdev->dev, "%d (%s/0x%04x/%s) - %s\n",
                        le32_to_cpu(evt_detail->seq_num),
                        format_timestamp(le32_to_cpu(evt_detail->time_stamp)),
                        (class_locale.members.locale),
                        format_class(class_locale.members.class),
                        evt_detail->description);
}

/**
*       The following functions are defined for xscale
*       (deviceid : 1064R, PERC5) controllers
*/

/**
 * megasas_enable_intr_xscale - Enables interrupts
 * @regs:                       MFI register set
 */
static inline void
megasas_enable_intr_xscale(struct megasas_instance *instance)
{
        struct megasas_register_set __iomem *regs;

        regs = instance->reg_set;
        writel(0, &(regs)->outbound_intr_mask);

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

/**
 * megasas_disable_intr_xscale -Disables interrupt
 * @regs:                       MFI register set
 */
static inline void
megasas_disable_intr_xscale(struct megasas_instance *instance)
{
        struct megasas_register_set __iomem *regs;
        u32 mask = 0x1f;

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

/**
 * megasas_read_fw_status_reg_xscale - returns the current FW status value
 * @regs:                       MFI register set
 */
static u32
megasas_read_fw_status_reg_xscale(struct megasas_register_set __iomem * regs)
{
        return readl(&(regs)->outbound_msg_0);
}
/**
 * megasas_clear_interrupt_xscale -     Check & clear interrupt
 * @regs:                               MFI register set
 */
static int
megasas_clear_intr_xscale(struct megasas_register_set __iomem * regs)
{
        u32 status;
        u32 mfiStatus = 0;

        /*
         * Check if it is our interrupt
         */
        status = readl(&regs->outbound_intr_status);

        if (status & MFI_OB_INTR_STATUS_MASK)
                mfiStatus = MFI_INTR_FLAG_REPLY_MESSAGE;
        if (status & MFI_XSCALE_OMR0_CHANGE_INTERRUPT)
                mfiStatus |= MFI_INTR_FLAG_FIRMWARE_STATE_CHANGE;

        /*
         * Clear the interrupt by writing back the same value
         */
        if (mfiStatus)
                writel(status, &regs->outbound_intr_status);

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

        return mfiStatus;
}

/**
 * megasas_fire_cmd_xscale -    Sends command to the FW
 * @frame_phys_addr :           Physical address of cmd
 * @frame_count :               Number of frames for the command
 * @regs :                      MFI register set
 */
static inline void
megasas_fire_cmd_xscale(struct megasas_instance *instance,
                dma_addr_t frame_phys_addr,
                u32 frame_count,
                struct megasas_register_set __iomem *regs)
{
        unsigned long flags;

        spin_lock_irqsave(&instance->hba_lock, flags);
        writel((frame_phys_addr >> 3)|(frame_count),
               &(regs)->inbound_queue_port);
        spin_unlock_irqrestore(&instance->hba_lock, flags);
}

/**
 * megasas_adp_reset_xscale -  For controller reset
 * @regs:                              MFI register set
 */
static int
megasas_adp_reset_xscale(struct megasas_instance *instance,
        struct megasas_register_set __iomem *regs)
{
        u32 i;
        u32 pcidata;

        writel(MFI_ADP_RESET, &regs->inbound_doorbell);

        for (i = 0; i < 3; i++)
                msleep(1000); /* sleep for 3 secs */
        pcidata  = 0;
        pci_read_config_dword(instance->pdev, MFI_1068_PCSR_OFFSET, &pcidata);
        dev_notice(&instance->pdev->dev, "pcidata = %x\n", pcidata);
        if (pcidata & 0x2) {
                dev_notice(&instance->pdev->dev, "mfi 1068 offset read=%x\n", pcidata);
                pcidata &= ~0x2;
                pci_write_config_dword(instance->pdev,
                                MFI_1068_PCSR_OFFSET, pcidata);

                for (i = 0; i < 2; i++)
                        msleep(1000); /* need to wait 2 secs again */

                pcidata  = 0;
                pci_read_config_dword(instance->pdev,
                                MFI_1068_FW_HANDSHAKE_OFFSET, &pcidata);
                dev_notice(&instance->pdev->dev, "1068 offset handshake read=%x\n", pcidata);
                if ((pcidata & 0xffff0000) == MFI_1068_FW_READY) {
                        dev_notice(&instance->pdev->dev, "1068 offset pcidt=%x\n", pcidata);
                        pcidata = 0;
                        pci_write_config_dword(instance->pdev,
                                MFI_1068_FW_HANDSHAKE_OFFSET, pcidata);
                }
        }
        return 0;
}

/**
 * megasas_check_reset_xscale - For controller reset check
 * @regs:                               MFI register set
 */
static int
megasas_check_reset_xscale(struct megasas_instance *instance,
                struct megasas_register_set __iomem *regs)
{
        if ((atomic_read(&instance->adprecovery) != MEGASAS_HBA_OPERATIONAL) &&
            (le32_to_cpu(*instance->consumer) ==
                MEGASAS_ADPRESET_INPROG_SIGN))
                return 1;
        return 0;
}

static struct megasas_instance_template megasas_instance_template_xscale = {

        .fire_cmd = megasas_fire_cmd_xscale,
        .enable_intr = megasas_enable_intr_xscale,
        .disable_intr = megasas_disable_intr_xscale,
        .clear_intr = megasas_clear_intr_xscale,
        .read_fw_status_reg = megasas_read_fw_status_reg_xscale,
        .adp_reset = megasas_adp_reset_xscale,
        .check_reset = megasas_check_reset_xscale,
        .service_isr = megasas_isr,
        .tasklet = megasas_complete_cmd_dpc,
        .init_adapter = megasas_init_adapter_mfi,
        .build_and_issue_cmd = megasas_build_and_issue_cmd,
        .issue_dcmd = megasas_issue_dcmd,
};

/**
*       This is the end of set of functions & definitions specific
*       to xscale (deviceid : 1064R, PERC5) controllers
*/

/**
*       The following functions are defined for ppc (deviceid : 0x60)
*       controllers
*/

/**
 * megasas_enable_intr_ppc -    Enables interrupts
 * @regs:                       MFI register set
 */
static inline void
megasas_enable_intr_ppc(struct megasas_instance *instance)
{
        struct megasas_register_set __iomem *regs;

        regs = instance->reg_set;
        writel(0xFFFFFFFF, &(regs)->outbound_doorbell_clear);

        writel(~0x80000000, &(regs)->outbound_intr_mask);

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

/**
 * megasas_disable_intr_ppc -   Disable interrupt
 * @regs:                       MFI register set
 */
static inline void
megasas_disable_intr_ppc(struct megasas_instance *instance)
{
        struct megasas_register_set __iomem *regs;
        u32 mask = 0xFFFFFFFF;

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

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

/**
 * megasas_clear_interrupt_ppc -        Check & clear interrupt
 * @regs:                               MFI register set
 */
static int
megasas_clear_intr_ppc(struct megasas_register_set __iomem * regs)
{
        u32 status, mfiStatus = 0;

        /*
         * Check if it is our interrupt
         */
        status = readl(&regs->outbound_intr_status);

        if (status & MFI_REPLY_1078_MESSAGE_INTERRUPT)
                mfiStatus = MFI_INTR_FLAG_REPLY_MESSAGE;

        if (status & MFI_G2_OUTBOUND_DOORBELL_CHANGE_INTERRUPT)
                mfiStatus |= MFI_INTR_FLAG_FIRMWARE_STATE_CHANGE;

        /*
         * Clear the interrupt by writing back the same value
         */
        writel(status, &regs->outbound_doorbell_clear);

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

        return mfiStatus;
}

/**
 * megasas_fire_cmd_ppc -       Sends command to the FW
 * @frame_phys_addr :           Physical address of cmd
 * @frame_count :               Number of frames for the command
 * @regs :                      MFI register set
 */
static inline void
megasas_fire_cmd_ppc(struct megasas_instance *instance,
                dma_addr_t frame_phys_addr,
                u32 frame_count,
                struct megasas_register_set __iomem *regs)
{
        unsigned long flags;

        spin_lock_irqsave(&instance->hba_lock, flags);
        writel((frame_phys_addr | (frame_count<<1))|1,
                        &(regs)->inbound_queue_port);
        spin_unlock_irqrestore(&instance->hba_lock, flags);
}

/**
 * megasas_check_reset_ppc -    For controller reset check
 * @regs:                               MFI register set
 */
static int
megasas_check_reset_ppc(struct megasas_instance *instance,
                        struct megasas_register_set __iomem *regs)
{
        if (atomic_read(&instance->adprecovery) != MEGASAS_HBA_OPERATIONAL)
                return 1;

        return 0;
}

static struct megasas_instance_template megasas_instance_template_ppc = {

        .fire_cmd = megasas_fire_cmd_ppc,
        .enable_intr = megasas_enable_intr_ppc,
        .disable_intr = megasas_disable_intr_ppc,
        .clear_intr = megasas_clear_intr_ppc,
        .read_fw_status_reg = megasas_read_fw_status_reg_ppc,
        .adp_reset = megasas_adp_reset_xscale,
        .check_reset = megasas_check_reset_ppc,
        .service_isr = megasas_isr,
        .tasklet = megasas_complete_cmd_dpc,
        .init_adapter = megasas_init_adapter_mfi,
        .build_and_issue_cmd = megasas_build_and_issue_cmd,
        .issue_dcmd = megasas_issue_dcmd,
};

/**
 * megasas_enable_intr_skinny - Enables interrupts
 * @regs:                       MFI register set
 */
static inline void
megasas_enable_intr_skinny(struct megasas_instance *instance)
{
        struct megasas_register_set __iomem *regs;

        regs = instance->reg_set;
        writel(0xFFFFFFFF, &(regs)->outbound_intr_mask);

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

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

/**
 * megasas_disable_intr_skinny -        Disables interrupt
 * @regs:                       MFI register set
 */
static inline void
megasas_disable_intr_skinny(struct megasas_instance *instance)
{
        struct megasas_register_set __iomem *regs;
        u32 mask = 0xFFFFFFFF;

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

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

/**
 * megasas_clear_interrupt_skinny -     Check & clear interrupt
 * @regs:                               MFI register set
 */
static int
megasas_clear_intr_skinny(struct megasas_register_set __iomem *regs)
{
        u32 status;
        u32 mfiStatus = 0;

        /*
         * Check if it is our interrupt
         */
        status = readl(&regs->outbound_intr_status);

        if (!(status & MFI_SKINNY_ENABLE_INTERRUPT_MASK)) {
                return 0;
        }

        /*
         * Check if it is our interrupt
         */
        if ((megasas_read_fw_status_reg_skinny(regs) & MFI_STATE_MASK) ==
            MFI_STATE_FAULT) {
                mfiStatus = MFI_INTR_FLAG_FIRMWARE_STATE_CHANGE;
        } else
                mfiStatus = MFI_INTR_FLAG_REPLY_MESSAGE;

        /*
         * Clear the interrupt by writing back the same value
         */
        writel(status, &regs->outbound_intr_status);

        /*
         * dummy read to flush PCI
         */
        readl(&regs->outbound_intr_status);

        return mfiStatus;
}

/**
 * megasas_fire_cmd_skinny -    Sends command to the FW
 * @frame_phys_addr :           Physical address of cmd
 * @frame_count :               Number of frames for the command
 * @regs :                      MFI register set
 */
static inline void
megasas_fire_cmd_skinny(struct megasas_instance *instance,
                        dma_addr_t frame_phys_addr,
                        u32 frame_count,
                        struct megasas_register_set __iomem *regs)
{
        unsigned long flags;

        spin_lock_irqsave(&instance->hba_lock, flags);
        writel(upper_32_bits(frame_phys_addr),
               &(regs)->inbound_high_queue_port);
        writel((lower_32_bits(frame_phys_addr) | (frame_count<<1))|1,
               &(regs)->inbound_low_queue_port);
        mmiowb();
        spin_unlock_irqrestore(&instance->hba_lock, flags);
}

/**
 * megasas_check_reset_skinny - For controller reset check
 * @regs:                               MFI register set
 */
static int
megasas_check_reset_skinny(struct megasas_instance *instance,
                                struct megasas_register_set __iomem *regs)
{
        if (atomic_read(&instance->adprecovery) != MEGASAS_HBA_OPERATIONAL)
                return 1;

        return 0;
}

static struct megasas_instance_template megasas_instance_template_skinny = {

        .fire_cmd = megasas_fire_cmd_skinny,
        .enable_intr = megasas_enable_intr_skinny,
        .disable_intr = megasas_disable_intr_skinny,
        .clear_intr = megasas_clear_intr_skinny,
        .read_fw_status_reg = megasas_read_fw_status_reg_skinny,
        .adp_reset = megasas_adp_reset_gen2,
        .check_reset = megasas_check_reset_skinny,
        .service_isr = megasas_isr,
        .tasklet = megasas_complete_cmd_dpc,
        .init_adapter = megasas_init_adapter_mfi,
        .build_and_issue_cmd = megasas_build_and_issue_cmd,
        .issue_dcmd = megasas_issue_dcmd,
};


/**
*       The following functions are defined for gen2 (deviceid : 0x78 0x79)
*       controllers
*/

/**
 * megasas_enable_intr_gen2 -  Enables interrupts
 * @regs:                      MFI register set
 */
static inline void
megasas_enable_intr_gen2(struct megasas_instance *instance)
{
        struct megasas_register_set __iomem *regs;

        regs = instance->reg_set;
        writel(0xFFFFFFFF, &(regs)->outbound_doorbell_clear);

        /* write ~0x00000005 (4 & 1) to the intr mask*/
        writel(~MFI_GEN2_ENABLE_INTERRUPT_MASK, &(regs)->outbound_intr_mask);

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

/**
 * megasas_disable_intr_gen2 - Disables interrupt
 * @regs:                      MFI register set
 */
static inline void
megasas_disable_intr_gen2(struct megasas_instance *instance)
{
        struct megasas_register_set __iomem *regs;
        u32 mask = 0xFFFFFFFF;

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

/**
 * megasas_read_fw_status_reg_gen2 - returns the current FW status value
 * @regs:                      MFI register set
 */
static u32
megasas_read_fw_status_reg_gen2(struct megasas_register_set __iomem *regs)
{
        return readl(&(regs)->outbound_scratch_pad);
}

/**
 * megasas_clear_interrupt_gen2 -      Check & clear interrupt
 * @regs:                              MFI register set
 */
static int
megasas_clear_intr_gen2(struct megasas_register_set __iomem *regs)
{
        u32 status;
        u32 mfiStatus = 0;

        /*
         * Check if it is our interrupt
         */
        status = readl(&regs->outbound_intr_status);

        if (status & MFI_INTR_FLAG_REPLY_MESSAGE) {
                mfiStatus = MFI_INTR_FLAG_REPLY_MESSAGE;
        }
        if (status & MFI_G2_OUTBOUND_DOORBELL_CHANGE_INTERRUPT) {
                mfiStatus |= MFI_INTR_FLAG_FIRMWARE_STATE_CHANGE;
        }

        /*
         * Clear the interrupt by writing back the same value
         */
        if (mfiStatus)
                writel(status, &regs->outbound_doorbell_clear);

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

        return mfiStatus;
}
/**
 * megasas_fire_cmd_gen2 -     Sends command to the FW
 * @frame_phys_addr :          Physical address of cmd
 * @frame_count :              Number of frames for the command
 * @regs :                     MFI register set
 */
static inline void
megasas_fire_cmd_gen2(struct megasas_instance *instance,
                        dma_addr_t frame_phys_addr,
                        u32 frame_count,
                        struct megasas_register_set __iomem *regs)
{
        unsigned long flags;

        spin_lock_irqsave(&instance->hba_lock, flags);
        writel((frame_phys_addr | (frame_count<<1))|1,
                        &(regs)->inbound_queue_port);
        spin_unlock_irqrestore(&instance->hba_lock, flags);
}

/**
 * megasas_adp_reset_gen2 -     For controller reset
 * @regs:                               MFI register set
 */
static int
megasas_adp_reset_gen2(struct megasas_instance *instance,
                        struct megasas_register_set __iomem *reg_set)
{
        u32 retry = 0 ;
        u32 HostDiag;
        u32 __iomem *seq_offset = &reg_set->seq_offset;
        u32 __iomem *hostdiag_offset = &reg_set->host_diag;

        if (instance->instancet == &megasas_instance_template_skinny) {
                seq_offset = &reg_set->fusion_seq_offset;
                hostdiag_offset = &reg_set->fusion_host_diag;
        }

        writel(0, seq_offset);
        writel(4, seq_offset);
        writel(0xb, seq_offset);
        writel(2, seq_offset);
        writel(7, seq_offset);
        writel(0xd, seq_offset);

        msleep(1000);

        HostDiag = (u32)readl(hostdiag_offset);

        while (!(HostDiag & DIAG_WRITE_ENABLE)) {
                msleep(100);
                HostDiag = (u32)readl(hostdiag_offset);
                dev_notice(&instance->pdev->dev, "RESETGEN2: retry=%x, hostdiag=%x\n",
                                        retry, HostDiag);

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

        }

        dev_notice(&instance->pdev->dev, "ADP_RESET_GEN2: HostDiag=%x\n", HostDiag);

        writel((HostDiag | DIAG_RESET_ADAPTER), hostdiag_offset);

        ssleep(10);

        HostDiag = (u32)readl(hostdiag_offset);
        while (HostDiag & DIAG_RESET_ADAPTER) {
                msleep(100);
                HostDiag = (u32)readl(hostdiag_offset);
                dev_notice(&instance->pdev->dev, "RESET_GEN2: retry=%x, hostdiag=%x\n",
                                retry, HostDiag);

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

        }
        return 0;
}

/**
 * megasas_check_reset_gen2 -   For controller reset check
 * @regs:                               MFI register set
 */
static int
megasas_check_reset_gen2(struct megasas_instance *instance,
                struct megasas_register_set __iomem *regs)
{
        if (atomic_read(&instance->adprecovery) != MEGASAS_HBA_OPERATIONAL)
                return 1;

        return 0;
}

static struct megasas_instance_template megasas_instance_template_gen2 = {

        .fire_cmd = megasas_fire_cmd_gen2,
        .enable_intr = megasas_enable_intr_gen2,
        .disable_intr = megasas_disable_intr_gen2,
        .clear_intr = megasas_clear_intr_gen2,
        .read_fw_status_reg = megasas_read_fw_status_reg_gen2,
        .adp_reset = megasas_adp_reset_gen2,
        .check_reset = megasas_check_reset_gen2,
        .service_isr = megasas_isr,
        .tasklet = megasas_complete_cmd_dpc,
        .init_adapter = megasas_init_adapter_mfi,
        .build_and_issue_cmd = megasas_build_and_issue_cmd,
        .issue_dcmd = megasas_issue_dcmd,
};

/**
*       This is the end of set of functions & definitions
*       specific to gen2 (deviceid : 0x78, 0x79) controllers
*/

/*
 * Template added for TB (Fusion)
 */
extern struct megasas_instance_template megasas_instance_template_fusion;

/**
 * megasas_issue_polled -       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 MFI_STAT_INVALID_STATUS before posting.
 */
int
megasas_issue_polled(struct megasas_instance *instance, struct megasas_cmd *cmd)
{
        struct megasas_header *frame_hdr = &cmd->frame->hdr;

        frame_hdr->cmd_status = MFI_STAT_INVALID_STATUS;
        frame_hdr->flags |= cpu_to_le16(MFI_FRAME_DONT_POST_IN_REPLY_QUEUE);

        if ((atomic_read(&instance->adprecovery) == MEGASAS_HW_CRITICAL_ERROR) ||
                (instance->instancet->issue_dcmd(instance, cmd))) {
                dev_err(&instance->pdev->dev, "Failed from %s %d\n",
                        __func__, __LINE__);
                return DCMD_NOT_FIRED;
        }

        return wait_and_poll(instance, cmd, instance->requestorId ?
                        MEGASAS_ROUTINE_WAIT_TIME_VF : MFI_IO_TIMEOUT_SECS);
}

/**
 * megasas_issue_blocked_cmd -  Synchronous wrapper around regular FW cmds
 * @instance:                   Adapter soft state
 * @cmd:                        Command to be issued
 * @timeout:                    Timeout in seconds
 *
 * This function waits on an event for the command to be returned from ISR.
 * Max wait time is MEGASAS_INTERNAL_CMD_WAIT_TIME secs
 * Used to issue ioctl commands.
 */
int
megasas_issue_blocked_cmd(struct megasas_instance *instance,
                          struct megasas_cmd *cmd, int timeout)
{
        int ret = 0;
        cmd->cmd_status_drv = MFI_STAT_INVALID_STATUS;

        if ((atomic_read(&instance->adprecovery) == MEGASAS_HW_CRITICAL_ERROR) ||
                (instance->instancet->issue_dcmd(instance, cmd))) {
                dev_err(&instance->pdev->dev, "Failed from %s %d\n",
                        __func__, __LINE__);
                return DCMD_NOT_FIRED;
        }

        if (timeout) {
                ret = wait_event_timeout(instance->int_cmd_wait_q,
                                cmd->cmd_status_drv != MFI_STAT_INVALID_STATUS, timeout * HZ);
                if (!ret) {
                        dev_err(&instance->pdev->dev, "Failed from %s %d DCMD Timed out\n",
                                __func__, __LINE__);
                        return DCMD_TIMEOUT;
                }
        } else
                wait_event(instance->int_cmd_wait_q,
                                cmd->cmd_status_drv != MFI_STAT_INVALID_STATUS);

        return (cmd->cmd_status_drv == MFI_STAT_OK) ?
                DCMD_SUCCESS : DCMD_FAILED;
}

/**
 * megasas_issue_blocked_abort_cmd -    Aborts previously issued cmd
 * @instance:                           Adapter soft state
 * @cmd_to_abort:                       Previously issued cmd to be aborted
 * @timeout:                            Timeout in seconds
 *
 * MFI firmware can abort previously issued AEN comamnd (automatic event
 * notification). The megasas_issue_blocked_abort_cmd() issues such abort
 * cmd and waits for return status.
 * Max wait time is MEGASAS_INTERNAL_CMD_WAIT_TIME secs
 */
static int
megasas_issue_blocked_abort_cmd(struct megasas_instance *instance,
                                struct megasas_cmd *cmd_to_abort, int timeout)
{
        struct megasas_cmd *cmd;
        struct megasas_abort_frame *abort_fr;
        int ret = 0;

        cmd = megasas_get_cmd(instance);

        if (!cmd)
                return -1;

        abort_fr = &cmd->frame->abort;

        /*
         * Prepare and issue the abort frame
         */
        abort_fr->cmd = MFI_CMD_ABORT;
        abort_fr->cmd_status = MFI_STAT_INVALID_STATUS;
        abort_fr->flags = cpu_to_le16(0);
        abort_fr->abort_context = cpu_to_le32(cmd_to_abort->index);
        abort_fr->abort_mfi_phys_addr_lo =
                cpu_to_le32(lower_32_bits(cmd_to_abort->frame_phys_addr));
        abort_fr->abort_mfi_phys_addr_hi =
                cpu_to_le32(upper_32_bits(cmd_to_abort->frame_phys_addr));

        cmd->sync_cmd = 1;
        cmd->cmd_status_drv = MFI_STAT_INVALID_STATUS;

        if ((atomic_read(&instance->adprecovery) == MEGASAS_HW_CRITICAL_ERROR) ||
                (instance->instancet->issue_dcmd(instance, cmd))) {
                dev_err(&instance->pdev->dev, "Failed from %s %d\n",
                        __func__, __LINE__);
                return DCMD_NOT_FIRED;
        }

        if (timeout) {
                ret = wait_event_timeout(instance->abort_cmd_wait_q,
                                cmd->cmd_status_drv != MFI_STAT_INVALID_STATUS, timeout * HZ);
                if (!ret) {
                        dev_err(&instance->pdev->dev, "Failed from %s %d Abort Timed out\n",
                                __func__, __LINE__);
                        return DCMD_TIMEOUT;
                }
        } else
                wait_event(instance->abort_cmd_wait_q,
                                cmd->cmd_status_drv != MFI_STAT_INVALID_STATUS);

        cmd->sync_cmd = 0;

        megasas_return_cmd(instance, cmd);
        return (cmd->cmd_status_drv == MFI_STAT_OK) ?
                DCMD_SUCCESS : DCMD_FAILED;
}

/**
 * megasas_make_sgl32 - Prepares 32-bit SGL
 * @instance:           Adapter soft state
 * @scp:                SCSI command from the mid-layer
 * @mfi_sgl:            SGL to be filled in
 *
 * If successful, this function returns the number of SG elements. Otherwise,
 * it returnes -1.
 */
static int
megasas_make_sgl32(struct megasas_instance *instance, struct scsi_cmnd *scp,
                   union megasas_sgl *mfi_sgl)
{
        int i;
        int sge_count;
        struct scatterlist *os_sgl;

        sge_count = scsi_dma_map(scp);
        BUG_ON(sge_count < 0);

        if (sge_count) {
                scsi_for_each_sg(scp, os_sgl, sge_count, i) {
                        mfi_sgl->sge32[i].length = cpu_to_le32(sg_dma_len(os_sgl));
                        mfi_sgl->sge32[i].phys_addr = cpu_to_le32(sg_dma_address(os_sgl));
                }
        }
        return sge_count;
}

/**
 * megasas_make_sgl64 - Prepares 64-bit SGL
 * @instance:           Adapter soft state
 * @scp:                SCSI command from the mid-layer
 * @mfi_sgl:            SGL to be filled in
 *
 * If successful, this function returns the number of SG elements. Otherwise,
 * it returnes -1.
 */
static int
megasas_make_sgl64(struct megasas_instance *instance, struct scsi_cmnd *scp,
                   union megasas_sgl *mfi_sgl)
{
        int i;
        int sge_count;
        struct scatterlist *os_sgl;

        sge_count = scsi_dma_map(scp);
        BUG_ON(sge_count < 0);

        if (sge_count) {
                scsi_for_each_sg(scp, os_sgl, sge_count, i) {
                        mfi_sgl->sge64[i].length = cpu_to_le32(sg_dma_len(os_sgl));
                        mfi_sgl->sge64[i].phys_addr = cpu_to_le64(sg_dma_address(os_sgl));
                }
        }
        return sge_count;
}

/**
 * megasas_make_sgl_skinny - Prepares IEEE SGL
 * @instance:           Adapter soft state
 * @scp:                SCSI command from the mid-layer
 * @mfi_sgl:            SGL to be filled in
 *
 * If successful, this function returns the number of SG elements. Otherwise,
 * it returnes -1.
 */
static int
megasas_make_sgl_skinny(struct megasas_instance *instance,
                struct scsi_cmnd *scp, union megasas_sgl *mfi_sgl)
{
        int i;
        int sge_count;
        struct scatterlist *os_sgl;

        sge_count = scsi_dma_map(scp);

        if (sge_count) {
                scsi_for_each_sg(scp, os_sgl, sge_count, i) {
                        mfi_sgl->sge_skinny[i].length =
                                cpu_to_le32(sg_dma_len(os_sgl));
                        mfi_sgl->sge_skinny[i].phys_addr =
                                cpu_to_le64(sg_dma_address(os_sgl));
                        mfi_sgl->sge_skinny[i].flag = cpu_to_le32(0);
                }
        }
        return sge_count;
}

 /**
 * megasas_get_frame_count - Computes the number of frames
 * @frame_type          : type of frame- io or pthru frame
 * @sge_count           : number of sg elements
 *
 * Returns the number of frames required for numnber of sge's (sge_count)
 */

static u32 megasas_get_frame_count(struct megasas_instance *instance,
                        u8 sge_count, u8 frame_type)
{
        int num_cnt;
        int sge_bytes;
        u32 sge_sz;
        u32 frame_count = 0;

        sge_sz = (IS_DMA64) ? sizeof(struct megasas_sge64) :
            sizeof(struct megasas_sge32);

        if (instance->flag_ieee) {
                sge_sz = sizeof(struct megasas_sge_skinny);
        }

        /*
         * Main frame can contain 2 SGEs for 64-bit SGLs and
         * 3 SGEs for 32-bit SGLs for ldio &
         * 1 SGEs for 64-bit SGLs and
         * 2 SGEs for 32-bit SGLs for pthru frame
         */
        if (unlikely(frame_type == PTHRU_FRAME)) {
                if (instance->flag_ieee == 1) {
                        num_cnt = sge_count - 1;
                } else if (IS_DMA64)
                        num_cnt = sge_count - 1;
                else
                        num_cnt = sge_count - 2;
        } else {
                if (instance->flag_ieee == 1) {
                        num_cnt = sge_count - 1;
                } else if (IS_DMA64)
                        num_cnt = sge_count - 2;
                else
                        num_cnt = sge_count - 3;
        }

        if (num_cnt > 0) {
                sge_bytes = sge_sz * num_cnt;

                frame_count = (sge_bytes / MEGAMFI_FRAME_SIZE) +
                    ((sge_bytes % MEGAMFI_FRAME_SIZE) ? 1 : 0) ;
        }
        /* Main frame */
        frame_count += 1;

        if (frame_count > 7)
                frame_count = 8;
        return frame_count;
}

/**
 * megasas_build_dcdb - Prepares a direct cdb (DCDB) command
 * @instance:           Adapter soft state
 * @scp:                SCSI command
 * @cmd:                Command to be prepared in
 *
 * This function prepares CDB commands. These are typcially pass-through
 * commands to the devices.
 */
static int
megasas_build_dcdb(struct megasas_instance *instance, struct scsi_cmnd *scp,
                   struct megasas_cmd *cmd)
{
        u32 is_logical;
        u32 device_id;
        u16 flags = 0;
        struct megasas_pthru_frame *pthru;

        is_logical = MEGASAS_IS_LOGICAL(scp);
        device_id = MEGASAS_DEV_INDEX(scp);
        pthru = (struct megasas_pthru_frame *)cmd->frame;

        if (scp->sc_data_direction == PCI_DMA_TODEVICE)
                flags = MFI_FRAME_DIR_WRITE;
        else if (scp->sc_data_direction == PCI_DMA_FROMDEVICE)
                flags = MFI_FRAME_DIR_READ;
        else if (scp->sc_data_direction == PCI_DMA_NONE)
                flags = MFI_FRAME_DIR_NONE;

        if (instance->flag_ieee == 1) {
                flags |= MFI_FRAME_IEEE;
        }

        /*
         * Prepare the DCDB frame
         */
        pthru->cmd = (is_logical) ? MFI_CMD_LD_SCSI_IO : MFI_CMD_PD_SCSI_IO;
        pthru->cmd_status = 0x0;
        pthru->scsi_status = 0x0;
        pthru->target_id = device_id;
        pthru->lun = scp->device->lun;
        pthru->cdb_len = scp->cmd_len;
        pthru->timeout = 0;
        pthru->pad_0 = 0;
        pthru->flags = cpu_to_le16(flags);
        pthru->data_xfer_len = cpu_to_le32(scsi_bufflen(scp));

        memcpy(pthru->cdb, scp->cmnd, scp->cmd_len);

        /*
         * If the command is for the tape device, set the
         * pthru timeout to the os layer timeout value.
         */
        if (scp->device->type == TYPE_TAPE) {
                if ((scp->request->timeout / HZ) > 0xFFFF)
                        pthru->timeout = cpu_to_le16(0xFFFF);
                else
                        pthru->timeout = cpu_to_le16(scp->request->timeout / HZ);
        }

        /*
         * Construct SGL
         */
        if (instance->flag_ieee == 1) {
                pthru->flags |= cpu_to_le16(MFI_FRAME_SGL64);
                pthru->sge_count = megasas_make_sgl_skinny(instance, scp,
                                                      &pthru->sgl);
        } else if (IS_DMA64) {
                pthru->flags |= cpu_to_le16(MFI_FRAME_SGL64);
                pthru->sge_count = megasas_make_sgl64(instance, scp,
                                                      &pthru->sgl);
        } else
                pthru->sge_count = megasas_make_sgl32(instance, scp,
                                                      &pthru->sgl);

        if (pthru->sge_count > instance->max_num_sge) {
                dev_err(&instance->pdev->dev, "DCDB too many SGE NUM=%x\n",
                        pthru->sge_count);
                return 0;
        }

        /*
         * Sense info specific
         */
        pthru->sense_len = SCSI_SENSE_BUFFERSIZE;
        pthru->sense_buf_phys_addr_hi =
                cpu_to_le32(upper_32_bits(cmd->sense_phys_addr));
        pthru->sense_buf_phys_addr_lo =
                cpu_to_le32(lower_32_bits(cmd->sense_phys_addr));

        /*
         * Compute the total number of frames this command consumes. FW uses
         * this number to pull sufficient number of frames from host memory.
         */
        cmd->frame_count = megasas_get_frame_count(instance, pthru->sge_count,
                                                        PTHRU_FRAME);

        return cmd->frame_count;
}

/**
 * megasas_build_ldio - Prepares IOs to logical devices
 * @instance:           Adapter soft state
 * @scp:                SCSI command
 * @cmd:                Command to be prepared
 *
 * Frames (and accompanying SGLs) for regular SCSI IOs use this function.
 */
static int
megasas_build_ldio(struct megasas_instance *instance, struct scsi_cmnd *scp,
                   struct megasas_cmd *cmd)
{
        u32 device_id;
        u8 sc = scp->cmnd[0];
        u16 flags = 0;
        struct megasas_io_frame *ldio;

        device_id = MEGASAS_DEV_INDEX(scp);
        ldio = (struct megasas_io_frame *)cmd->frame;

        if (scp->sc_data_direction == PCI_DMA_TODEVICE)
                flags = MFI_FRAME_DIR_WRITE;
        else if (scp->sc_data_direction == PCI_DMA_FROMDEVICE)
                flags = MFI_FRAME_DIR_READ;

        if (instance->flag_ieee == 1) {
                flags |= MFI_FRAME_IEEE;
        }

        /*
         * Prepare the Logical IO frame: 2nd bit is zero for all read cmds
         */
        ldio->cmd = (sc & 0x02) ? MFI_CMD_LD_WRITE : MFI_CMD_LD_READ;
        ldio->cmd_status = 0x0;
        ldio->scsi_status = 0x0;
        ldio->target_id = device_id;
        ldio->timeout = 0;
        ldio->reserved_0 = 0;
        ldio->pad_0 = 0;
        ldio->flags = cpu_to_le16(flags);
        ldio->start_lba_hi = 0;
        ldio->access_byte = (scp->cmd_len != 6) ? scp->cmnd[1] : 0;

        /*
         * 6-byte READ(0x08) or WRITE(0x0A) cdb
         */
        if (scp->cmd_len == 6) {
                ldio->lba_count = cpu_to_le32((u32) scp->cmnd[4]);
                ldio->start_lba_lo = cpu_to_le32(((u32) scp->cmnd[1] << 16) |
                                                 ((u32) scp->cmnd[2] << 8) |
                                                 (u32) scp->cmnd[3]);

                ldio->start_lba_lo &= cpu_to_le32(0x1FFFFF);
        }

        /*
         * 10-byte READ(0x28) or WRITE(0x2A) cdb
         */
        else if (scp->cmd_len == 10) {
                ldio->lba_count = cpu_to_le32((u32) scp->cmnd[8] |
                                              ((u32) scp->cmnd[7] << 8));
                ldio->start_lba_lo = cpu_to_le32(((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) {
                ldio->lba_count = cpu_to_le32(((u32) scp->cmnd[6] << 24) |
                                              ((u32) scp->cmnd[7] << 16) |
                                              ((u32) scp->cmnd[8] << 8) |
                                              (u32) scp->cmnd[9]);

                ldio->start_lba_lo = cpu_to_le32(((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) {
                ldio->lba_count = cpu_to_le32(((u32) scp->cmnd[10] << 24) |
                                              ((u32) scp->cmnd[11] << 16) |
                                              ((u32) scp->cmnd[12] << 8) |
                                              (u32) scp->cmnd[13]);

                ldio->start_lba_lo = cpu_to_le32(((u32) scp->cmnd[6] << 24) |
                                                 ((u32) scp->cmnd[7] << 16) |
                                                 ((u32) scp->cmnd[8] << 8) |
                                                 (u32) scp->cmnd[9]);

                ldio->start_lba_hi = cpu_to_le32(((u32) scp->cmnd[2] << 24) |
                                                 ((u32) scp->cmnd[3] << 16) |
                                                 ((u32) scp->cmnd[4] << 8) |
                                                 (u32) scp->cmnd[5]);

        }

        /*
         * Construct SGL
         */
        if (instance->flag_ieee) {
                ldio->flags |= cpu_to_le16(MFI_FRAME_SGL64);
                ldio->sge_count = megasas_make_sgl_skinny(instance, scp,
                                              &ldio->sgl);
        } else if (IS_DMA64) {
                ldio->flags |= cpu_to_le16(MFI_FRAME_SGL64);
                ldio->sge_count = megasas_make_sgl64(instance, scp, &ldio->sgl);
        } else
                ldio->sge_count = megasas_make_sgl32(instance, scp, &ldio->sgl);

        if (ldio->sge_count > instance->max_num_sge) {
                dev_err(&instance->pdev->dev, "build_ld_io: sge_count = %x\n",
                        ldio->sge_count);
                return 0;
        }

        /*
         * Sense info specific
         */
        ldio->sense_len = SCSI_SENSE_BUFFERSIZE;
        ldio->sense_buf_phys_addr_hi = 0;
        ldio->sense_buf_phys_addr_lo = cpu_to_le32(cmd->sense_phys_addr);

        /*
         * Compute the total number of frames this command consumes. FW uses
         * this number to pull sufficient number of frames from host memory.
         */
        cmd->frame_count = megasas_get_frame_count(instance,
                        ldio->sge_count, IO_FRAME);

        return cmd->frame_count;
}

/**
 * megasas_cmd_type -           Checks if the cmd is for logical drive/sysPD
 *                              and whether it's RW or non RW
 * @scmd:                       SCSI command
 *
 */
inline int megasas_cmd_type(struct scsi_cmnd *cmd)
{
        int ret;

        switch (cmd->cmnd[0]) {
        case READ_10:
        case WRITE_10:
        case READ_12:
        case WRITE_12:
        case READ_6:
        case WRITE_6:
        case READ_16:
        case WRITE_16:
                ret = (MEGASAS_IS_LOGICAL(cmd)) ?
                        READ_WRITE_LDIO : READ_WRITE_SYSPDIO;
                break;
        default:
                ret = (MEGASAS_IS_LOGICAL(cmd)) ?
                        NON_READ_WRITE_LDIO : NON_READ_WRITE_SYSPDIO;
        }
        return ret;
}

 /**
 * megasas_dump_pending_frames -        Dumps the frame address of all pending cmds
 *                                      in FW
 * @instance:                           Adapter soft state
 */
static inline void
megasas_dump_pending_frames(struct megasas_instance *instance)
{
        struct megasas_cmd *cmd;
        int i,n;
        union megasas_sgl *mfi_sgl;
        struct megasas_io_frame *ldio;
        struct megasas_pthru_frame *pthru;
        u32 sgcount;
        u32 max_cmd = instance->max_fw_cmds;

        dev_err(&instance->pdev->dev, "[%d]: Dumping Frame Phys Address of all pending cmds in FW\n",instance->host->host_no);
        dev_err(&instance->pdev->dev, "[%d]: Total OS Pending cmds : %d\n",instance->host->host_no,atomic_read(&instance->fw_outstanding));
        if (IS_DMA64)
                dev_err(&instance->pdev->dev, "[%d]: 64 bit SGLs were sent to FW\n",instance->host->host_no);
        else
                dev_err(&instance->pdev->dev, "[%d]: 32 bit SGLs were sent to FW\n",instance->host->host_no);

        dev_err(&instance->pdev->dev, "[%d]: Pending OS cmds in FW : \n",instance->host->host_no);
        for (i = 0; i < max_cmd; i++) {
                cmd = instance->cmd_list[i];
                if (!cmd->scmd)
                        continue;
                dev_err(&instance->pdev->dev, "[%d]: Frame addr :0x%08lx : ",instance->host->host_no,(unsigned long)cmd->frame_phys_addr);
                if (megasas_cmd_type(cmd->scmd) == READ_WRITE_LDIO) {
                        ldio = (struct megasas_io_frame *)cmd->frame;
                        mfi_sgl = &ldio->sgl;
                        sgcount = ldio->sge_count;
                        dev_err(&instance->pdev->dev, "[%d]: frame count : 0x%x, Cmd : 0x%x, Tgt id : 0x%x,"
                        " lba lo : 0x%x, lba_hi : 0x%x, sense_buf addr : 0x%x,sge count : 0x%x\n",
                        instance->host->host_no, cmd->frame_count, ldio->cmd, ldio->target_id,
                        le32_to_cpu(ldio->start_lba_lo), le32_to_cpu(ldio->start_lba_hi),
                        le32_to_cpu(ldio->sense_buf_phys_addr_lo), sgcount);
                } else {
                        pthru = (struct megasas_pthru_frame *) cmd->frame;
                        mfi_sgl = &pthru->sgl;
                        sgcount = pthru->sge_count;
                        dev_err(&instance->pdev->dev, "[%d]: frame count : 0x%x, Cmd : 0x%x, Tgt id : 0x%x, "
                        "lun : 0x%x, cdb_len : 0x%x, data xfer len : 0x%x, sense_buf addr : 0x%x,sge count : 0x%x\n",
                        instance->host->host_no, cmd->frame_count, pthru->cmd, pthru->target_id,
                        pthru->lun, pthru->cdb_len, le32_to_cpu(pthru->data_xfer_len),
                        le32_to_cpu(pthru->sense_buf_phys_addr_lo), sgcount);
                }
                if (megasas_dbg_lvl & MEGASAS_DBG_LVL) {
                        for (n = 0; n < sgcount; n++) {
                                if (IS_DMA64)
                                        dev_err(&instance->pdev->dev, "sgl len : 0x%x, sgl addr : 0x%llx\n",
                                                le32_to_cpu(mfi_sgl->sge64[n].length),
                                                le64_to_cpu(mfi_sgl->sge64[n].phys_addr));
                                else
                                        dev_err(&instance->pdev->dev, "sgl len : 0x%x, sgl addr : 0x%x\n",
                                                le32_to_cpu(mfi_sgl->sge32[n].length),
                                                le32_to_cpu(mfi_sgl->sge32[n].phys_addr));
                        }
                }
        } /*for max_cmd*/
        dev_err(&instance->pdev->dev, "[%d]: Pending Internal cmds in FW : \n",instance->host->host_no);
        for (i = 0; i < max_cmd; i++) {

                cmd = instance->cmd_list[i];

                if (cmd->sync_cmd == 1)
                        dev_err(&instance->pdev->dev, "0x%08lx : ", (unsigned long)cmd->frame_phys_addr);
        }
        dev_err(&instance->pdev->dev, "[%d]: Dumping Done\n\n",instance->host->host_no);
}

u32
megasas_build_and_issue_cmd(struct megasas_instance *instance,
                            struct scsi_cmnd *scmd)
{
        struct megasas_cmd *cmd;
        u32 frame_count;

        cmd = megasas_get_cmd(instance);
        if (!cmd)
                return SCSI_MLQUEUE_HOST_BUSY;

        /*
         * Logical drive command
         */
        if (megasas_cmd_type(scmd) == READ_WRITE_LDIO)
                frame_count = megasas_build_ldio(instance, scmd, cmd);
        else
                frame_count = megasas_build_dcdb(instance, scmd, cmd);

        if (!frame_count)
                goto out_return_cmd;

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

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

        instance->instancet->fire_cmd(instance, cmd->frame_phys_addr,
                                cmd->frame_count-1, instance->reg_set);

        return 0;
out_return_cmd:
        megasas_return_cmd(instance, cmd);
        return SCSI_MLQUEUE_HOST_BUSY;
}


/**
 * megasas_queue_command -      Queue entry point
 * @scmd:                       SCSI command to be queued
 * @done:                       Callback entry point
 */
static int
megasas_queue_command(struct Scsi_Host *shost, struct scsi_cmnd *scmd)
{
        struct megasas_instance *instance;
        struct MR_PRIV_DEVICE *mr_device_priv_data;

        instance = (struct megasas_instance *)
            scmd->device->host->hostdata;

        if (instance->unload == 1) {
                scmd->result = DID_NO_CONNECT << 16;
                scmd->scsi_done(scmd);
                return 0;
        }

        if (instance->issuepend_done == 0)
                return SCSI_MLQUEUE_HOST_BUSY;


        /* Check for an mpio path and adjust behavior */
        if (atomic_read(&instance->adprecovery) == MEGASAS_ADPRESET_SM_INFAULT) {
                if (megasas_check_mpio_paths(instance, scmd) ==
                    (DID_RESET << 16)) {
                        return SCSI_MLQUEUE_HOST_BUSY;
                } else {
                        scmd->result = DID_NO_CONNECT << 16;
                        scmd->scsi_done(scmd);
                        return 0;
                }
        }

        if (atomic_read(&instance->adprecovery) == MEGASAS_HW_CRITICAL_ERROR) {
                scmd->result = DID_NO_CONNECT << 16;
                scmd->scsi_done(scmd);
                return 0;
        }

        mr_device_priv_data = scmd->device->hostdata;
        if (!mr_device_priv_data) {
                scmd->result = DID_NO_CONNECT << 16;
                scmd->scsi_done(scmd);
                return 0;
        }

        if (atomic_read(&instance->adprecovery) != MEGASAS_HBA_OPERATIONAL)
                return SCSI_MLQUEUE_HOST_BUSY;

        if (mr_device_priv_data->tm_busy)
                return SCSI_MLQUEUE_DEVICE_BUSY;


        scmd->result = 0;

        if (MEGASAS_IS_LOGICAL(scmd) &&
            (scmd->device->id >= instance->fw_supported_vd_count ||
                scmd->device->lun)) {
                scmd->result = DID_BAD_TARGET << 16;
                goto out_done;
        }

        switch (scmd->cmnd[0]) {
        case SYNCHRONIZE_CACHE:
                /*
                 * FW takes care of flush cache on its own
                 * No need to send it down
                 */
                scmd->result = DID_OK << 16;
                goto out_done;
        default:
                break;
        }

        return instance->instancet->build_and_issue_cmd(instance, scmd);

 out_done:
        scmd->scsi_done(scmd);
        return 0;
}

static struct megasas_instance *megasas_lookup_instance(u16 host_no)
{
        int i;

        for (i = 0; i < megasas_mgmt_info.max_index; i++) {

                if ((megasas_mgmt_info.instance[i]) &&
                    (megasas_mgmt_info.instance[i]->host->host_no == host_no))
                        return megasas_mgmt_info.instance[i];
        }

        return NULL;
}

/*
* megasas_update_sdev_properties - Update sdev structure based on controller's FW capabilities
*
* @sdev: OS provided scsi device
*
* Returns void
*/
void megasas_update_sdev_properties(struct scsi_device *sdev)
{
        u16 pd_index = 0;
        u32 device_id, ld;
        struct megasas_instance *instance;
        struct fusion_context *fusion;
        struct MR_PRIV_DEVICE *mr_device_priv_data;
        struct MR_PD_CFG_SEQ_NUM_SYNC *pd_sync;
        struct MR_LD_RAID *raid;
        struct MR_DRV_RAID_MAP_ALL *local_map_ptr;

        instance = megasas_lookup_instance(sdev->host->host_no);
        fusion = instance->ctrl_context;
        mr_device_priv_data = sdev->hostdata;

        if (!fusion)
                return;

        if (sdev->channel < MEGASAS_MAX_PD_CHANNELS &&
                instance->use_seqnum_jbod_fp) {
                pd_index = (sdev->channel * MEGASAS_MAX_DEV_PER_CHANNEL) +
                        sdev->id;
                pd_sync = (void *)fusion->pd_seq_sync
                                [(instance->pd_seq_map_id - 1) & 1];
                mr_device_priv_data->is_tm_capable =
                        pd_sync->seq[pd_index].capability.tmCapable;
        } else {
                device_id = ((sdev->channel % 2) * MEGASAS_MAX_DEV_PER_CHANNEL)
                                        + sdev->id;
                local_map_ptr = fusion->ld_drv_map[(instance->map_id & 1)];
                ld = MR_TargetIdToLdGet(device_id, local_map_ptr);
                raid = MR_LdRaidGet(ld, local_map_ptr);

                if (raid->capability.ldPiMode == MR_PROT_INFO_TYPE_CONTROLLER)
                blk_queue_update_dma_alignment(sdev->request_queue, 0x7);
                mr_device_priv_data->is_tm_capable =
                        raid->capability.tmCapable;
        }
}

static void megasas_set_device_queue_depth(struct scsi_device *sdev)
{
        u16                             pd_index = 0;
        int             ret = DCMD_FAILED;
        struct megasas_instance *instance;

        instance = megasas_lookup_instance(sdev->host->host_no);

        if (sdev->channel < MEGASAS_MAX_PD_CHANNELS) {
                pd_index = (sdev->channel * MEGASAS_MAX_DEV_PER_CHANNEL) + sdev->id;

                if (instance->pd_info) {
                        mutex_lock(&instance->hba_mutex);
                        ret = megasas_get_pd_info(instance, pd_index);
                        mutex_unlock(&instance->hba_mutex);
                }

                if (ret != DCMD_SUCCESS)
                        return;

                if (instance->pd_list[pd_index].driveState == MR_PD_STATE_SYSTEM) {

                        switch (instance->pd_list[pd_index].interface) {
                        case SAS_PD:
                                scsi_change_queue_depth(sdev, MEGASAS_SAS_QD);
                                break;

                        case SATA_PD:
                                scsi_change_queue_depth(sdev, MEGASAS_SATA_QD);
                                break;

                        default:
                                scsi_change_queue_depth(sdev, MEGASAS_DEFAULT_PD_QD);
                        }
                }
        }
}


static int megasas_slave_configure(struct scsi_device *sdev)
{
        u16 pd_index = 0;
        struct megasas_instance *instance;

        instance = megasas_lookup_instance(sdev->host->host_no);
        if (instance->pd_list_not_supported) {
                if (sdev->channel < MEGASAS_MAX_PD_CHANNELS &&
                        sdev->type == TYPE_DISK) {
                        pd_index = (sdev->channel * MEGASAS_MAX_DEV_PER_CHANNEL) +
                                sdev->id;
                        if (instance->pd_list[pd_index].driveState !=
                                MR_PD_STATE_SYSTEM)
                                return -ENXIO;
                }
        }
        megasas_set_device_queue_depth(sdev);
        megasas_update_sdev_properties(sdev);

        /*
         * The RAID firmware may require extended timeouts.
         */
        blk_queue_rq_timeout(sdev->request_queue,
                scmd_timeout * HZ);

        return 0;
}

static int megasas_slave_alloc(struct scsi_device *sdev)
{
        u16 pd_index = 0;
        struct megasas_instance *instance ;
        struct MR_PRIV_DEVICE *mr_device_priv_data;

        instance = megasas_lookup_instance(sdev->host->host_no);
        if (sdev->channel < MEGASAS_MAX_PD_CHANNELS) {
                /*
                 * Open the OS scan to the SYSTEM PD
                 */
                pd_index =
                        (sdev->channel * MEGASAS_MAX_DEV_PER_CHANNEL) +
                        sdev->id;
                if ((instance->pd_list_not_supported ||
                        instance->pd_list[pd_index].driveState ==
                        MR_PD_STATE_SYSTEM)) {
                        goto scan_target;
                }
                return -ENXIO;
        }

scan_target:
        mr_device_priv_data = kzalloc(sizeof(*mr_device_priv_data),
                                        GFP_KERNEL);
        if (!mr_device_priv_data)
                return -ENOMEM;
        sdev->hostdata = mr_device_priv_data;
        return 0;
}

static void megasas_slave_destroy(struct scsi_device *sdev)
{
        kfree(sdev->hostdata);
        sdev->hostdata = NULL;
}

/*
* megasas_complete_outstanding_ioctls - Complete outstanding ioctls after a
*                                       kill adapter
* @instance:                            Adapter soft state
*
*/
static void megasas_complete_outstanding_ioctls(struct megasas_instance *instance)
{
        int i;
        struct megasas_cmd *cmd_mfi;
        struct megasas_cmd_fusion *cmd_fusion;
        struct fusion_context *fusion = instance->ctrl_context;

        /* Find all outstanding ioctls */
        if (fusion) {
                for (i = 0; i < instance->max_fw_cmds; i++) {
                        cmd_fusion = fusion->cmd_list[i];
                        if (cmd_fusion->sync_cmd_idx != (u32)ULONG_MAX) {
                                cmd_mfi = instance->cmd_list[cmd_fusion->sync_cmd_idx];
                                if (cmd_mfi->sync_cmd &&
                                        cmd_mfi->frame->hdr.cmd != MFI_CMD_ABORT)
                                        megasas_complete_cmd(instance,
                                                             cmd_mfi, DID_OK);
                        }
                }
        } else {
                for (i = 0; i < instance->max_fw_cmds; i++) {
                        cmd_mfi = instance->cmd_list[i];
                        if (cmd_mfi->sync_cmd && cmd_mfi->frame->hdr.cmd !=
                                MFI_CMD_ABORT)
                                megasas_complete_cmd(instance, cmd_mfi, DID_OK);
                }
        }
}


void megaraid_sas_kill_hba(struct megasas_instance *instance)
{
        /* Set critical error to block I/O & ioctls in case caller didn't */
        atomic_set(&instance->adprecovery, MEGASAS_HW_CRITICAL_ERROR);
        /* Wait 1 second to ensure IO or ioctls in build have posted */
        msleep(1000);
        if ((instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0073SKINNY) ||
                (instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0071SKINNY) ||
                (instance->ctrl_context)) {
                writel(MFI_STOP_ADP, &instance->reg_set->doorbell);
                /* Flush */
                readl(&instance->reg_set->doorbell);
                if (instance->requestorId && instance->peerIsPresent)
                        memset(instance->ld_ids, 0xff, MEGASAS_MAX_LD_IDS);
        } else {
                writel(MFI_STOP_ADP,
                        &instance->reg_set->inbound_doorbell);
        }
        /* Complete outstanding ioctls when adapter is killed */
        megasas_complete_outstanding_ioctls(instance);
}

 /**
  * megasas_check_and_restore_queue_depth - Check if queue depth needs to be
  *                                     restored to max value
  * @instance:                  Adapter soft state
  *
  */
void
megasas_check_and_restore_queue_depth(struct megasas_instance *instance)
{
        unsigned long flags;

        if (instance->flag & MEGASAS_FW_BUSY
            && time_after(jiffies, instance->last_time + 5 * HZ)
            && atomic_read(&instance->fw_outstanding) <
            instance->throttlequeuedepth + 1) {

                spin_lock_irqsave(instance->host->host_lock, flags);
                instance->flag &= ~MEGASAS_FW_BUSY;

                instance->host->can_queue = instance->cur_can_queue;
                spin_unlock_irqrestore(instance->host->host_lock, flags);
        }
}

/**
 * megasas_complete_cmd_dpc      -      Returns FW's controller structure
 * @instance_addr:                      Address of adapter soft state
 *
 * Tasklet to complete cmds
 */
static void megasas_complete_cmd_dpc(unsigned long instance_addr)
{
        u32 producer;
        u32 consumer;
        u32 context;
        struct megasas_cmd *cmd;
        struct megasas_instance *instance =
                                (struct megasas_instance *)instance_addr;
        unsigned long flags;

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

        spin_lock_irqsave(&instance->completion_lock, flags);

        producer = le32_to_cpu(*instance->producer);
        consumer = le32_to_cpu(*instance->consumer);

        while (consumer != producer) {
                context = le32_to_cpu(instance->reply_queue[consumer]);
                if (context >= instance->max_fw_cmds) {
                        dev_err(&instance->pdev->dev, "Unexpected context value %x\n",
                                context);
                        BUG();
                }

                cmd = instance->cmd_list[context];

                megasas_complete_cmd(instance, cmd, DID_OK);

                consumer++;
                if (consumer == (instance->max_fw_cmds + 1)) {
                        consumer = 0;
                }
        }

        *instance->consumer = cpu_to_le32(producer);

        spin_unlock_irqrestore(&instance->completion_lock, flags);

        /*
         * Check if we can restore can_queue
         */
        megasas_check_and_restore_queue_depth(instance);
}

/**
 * megasas_start_timer - Initializes a timer object
 * @instance:           Adapter soft state
 * @timer:              timer object to be initialized
 * @fn:                 timer function
 * @interval:           time interval between timer function call
 *
 */
void megasas_start_timer(struct megasas_instance *instance,
                        struct timer_list *timer,
                        void *fn, unsigned long interval)
{
        init_timer(timer);
        timer->expires = jiffies + interval;
        timer->data = (unsigned long)instance;
        timer->function = fn;
        add_timer(timer);
}

static void
megasas_internal_reset_defer_cmds(struct megasas_instance *instance);

static void
process_fw_state_change_wq(struct work_struct *work);

void megasas_do_ocr(struct megasas_instance *instance)
{
        if ((instance->pdev->device == PCI_DEVICE_ID_LSI_SAS1064R) ||
        (instance->pdev->device == PCI_DEVICE_ID_DELL_PERC5) ||
        (instance->pdev->device == PCI_DEVICE_ID_LSI_VERDE_ZCR)) {
                *instance->consumer = cpu_to_le32(MEGASAS_ADPRESET_INPROG_SIGN);
        }
        instance->instancet->disable_intr(instance);
        atomic_set(&instance->adprecovery, MEGASAS_ADPRESET_SM_INFAULT);
        instance->issuepend_done = 0;

        atomic_set(&instance->fw_outstanding, 0);
        megasas_internal_reset_defer_cmds(instance);
        process_fw_state_change_wq(&instance->work_init);
}

static int megasas_get_ld_vf_affiliation_111(struct megasas_instance *instance,
                                            int initial)
{
        struct megasas_cmd *cmd;
        struct megasas_dcmd_frame *dcmd;
        struct MR_LD_VF_AFFILIATION_111 *new_affiliation_111 = NULL;
        dma_addr_t new_affiliation_111_h;
        int ld, retval = 0;
        u8 thisVf;

        cmd = megasas_get_cmd(instance);

        if (!cmd) {
                dev_printk(KERN_DEBUG, &instance->pdev->dev, "megasas_get_ld_vf_affiliation_111:"
                       "Failed to get cmd for scsi%d\n",
                        instance->host->host_no);
                return -ENOMEM;
        }

        dcmd = &cmd->frame->dcmd;

        if (!instance->vf_affiliation_111) {
                dev_warn(&instance->pdev->dev, "SR-IOV: Couldn't get LD/VF "
                       "affiliation for scsi%d\n", instance->host->host_no);
                megasas_return_cmd(instance, cmd);
                return -ENOMEM;
        }

        if (initial)
                        memset(instance->vf_affiliation_111, 0,
                               sizeof(struct MR_LD_VF_AFFILIATION_111));
        else {
                new_affiliation_111 =
                        pci_alloc_consistent(instance->pdev,
                                             sizeof(struct MR_LD_VF_AFFILIATION_111),
                                             &new_affiliation_111_h);
                if (!new_affiliation_111) {
                        dev_printk(KERN_DEBUG, &instance->pdev->dev, "SR-IOV: Couldn't allocate "
                               "memory for new affiliation for scsi%d\n",
                               instance->host->host_no);
                        megasas_return_cmd(instance, cmd);
                        return -ENOMEM;
                }
                memset(new_affiliation_111, 0,
                       sizeof(struct MR_LD_VF_AFFILIATION_111));
        }

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

        dcmd->cmd = MFI_CMD_DCMD;
        dcmd->cmd_status = MFI_STAT_INVALID_STATUS;
        dcmd->sge_count = 1;
        dcmd->flags = cpu_to_le16(MFI_FRAME_DIR_BOTH);
        dcmd->timeout = 0;
        dcmd->pad_0 = 0;
        dcmd->data_xfer_len =
                cpu_to_le32(sizeof(struct MR_LD_VF_AFFILIATION_111));
        dcmd->opcode = cpu_to_le32(MR_DCMD_LD_VF_MAP_GET_ALL_LDS_111);

        if (initial)
                dcmd->sgl.sge32[0].phys_addr =
                        cpu_to_le32(instance->vf_affiliation_111_h);
        else
                dcmd->sgl.sge32[0].phys_addr =
                        cpu_to_le32(new_affiliation_111_h);

        dcmd->sgl.sge32[0].length = cpu_to_le32(
                sizeof(struct MR_LD_VF_AFFILIATION_111));

        dev_warn(&instance->pdev->dev, "SR-IOV: Getting LD/VF affiliation for "
               "scsi%d\n", instance->host->host_no);

        if (megasas_issue_blocked_cmd(instance, cmd, 0) != DCMD_SUCCESS) {
                dev_warn(&instance->pdev->dev, "SR-IOV: LD/VF affiliation DCMD"
                       " failed with status 0x%x for scsi%d\n",
                       dcmd->cmd_status, instance->host->host_no);
                retval = 1; /* Do a scan if we couldn't get affiliation */
                goto out;
        }

        if (!initial) {
                thisVf = new_affiliation_111->thisVf;
                for (ld = 0 ; ld < new_affiliation_111->vdCount; ld++)
                        if (instance->vf_affiliation_111->map[ld].policy[thisVf] !=
                            new_affiliation_111->map[ld].policy[thisVf]) {
                                dev_warn(&instance->pdev->dev, "SR-IOV: "
                                       "Got new LD/VF affiliation for scsi%d\n",
                                       instance->host->host_no);
                                memcpy(instance->vf_affiliation_111,
                                       new_affiliation_111,
                                       sizeof(struct MR_LD_VF_AFFILIATION_111));
                                retval = 1;
                                goto out;
                        }
        }
out:
        if (new_affiliation_111) {
                pci_free_consistent(instance->pdev,
                                    sizeof(struct MR_LD_VF_AFFILIATION_111),
                                    new_affiliation_111,
                                    new_affiliation_111_h);
        }

        megasas_return_cmd(instance, cmd);

        return retval;
}

static int megasas_get_ld_vf_affiliation_12(struct megasas_instance *instance,
                                            int initial)
{
        struct megasas_cmd *cmd;
        struct megasas_dcmd_frame *dcmd;
        struct MR_LD_VF_AFFILIATION *new_affiliation = NULL;
        struct MR_LD_VF_MAP *newmap = NULL, *savedmap = NULL;
        dma_addr_t new_affiliation_h;
        int i, j, retval = 0, found = 0, doscan = 0;
        u8 thisVf;

        cmd = megasas_get_cmd(instance);

        if (!cmd) {
                dev_printk(KERN_DEBUG, &instance->pdev->dev, "megasas_get_ld_vf_affiliation12: "
                       "Failed to get cmd for scsi%d\n",
                       instance->host->host_no);
                return -ENOMEM;
        }

        dcmd = &cmd->frame->dcmd;

        if (!instance->vf_affiliation) {
                dev_warn(&instance->pdev->dev, "SR-IOV: Couldn't get LD/VF "
                       "affiliation for scsi%d\n", instance->host->host_no);
                megasas_return_cmd(instance, cmd);
                return -ENOMEM;
        }

        if (initial)
                memset(instance->vf_affiliation, 0, (MAX_LOGICAL_DRIVES + 1) *
                       sizeof(struct MR_LD_VF_AFFILIATION));
        else {
                new_affiliation =
                        pci_alloc_consistent(instance->pdev,
                                             (MAX_LOGICAL_DRIVES + 1) *
                                             sizeof(struct MR_LD_VF_AFFILIATION),
                                             &new_affiliation_h);
                if (!new_affiliation) {
                        dev_printk(KERN_DEBUG, &instance->pdev->dev, "SR-IOV: Couldn't allocate "
                               "memory for new affiliation for scsi%d\n",
                               instance->host->host_no);
                        megasas_return_cmd(instance, cmd);
                        return -ENOMEM;
                }
                memset(new_affiliation, 0, (MAX_LOGICAL_DRIVES + 1) *
                       sizeof(struct MR_LD_VF_AFFILIATION));
        }

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

        dcmd->cmd = MFI_CMD_DCMD;
        dcmd->cmd_status = MFI_STAT_INVALID_STATUS;
        dcmd->sge_count = 1;
        dcmd->flags = cpu_to_le16(MFI_FRAME_DIR_BOTH);
        dcmd->timeout = 0;
        dcmd->pad_0 = 0;
        dcmd->data_xfer_len = cpu_to_le32((MAX_LOGICAL_DRIVES + 1) *
                sizeof(struct MR_LD_VF_AFFILIATION));
        dcmd->opcode = cpu_to_le32(MR_DCMD_LD_VF_MAP_GET_ALL_LDS);

        if (initial)
                dcmd->sgl.sge32[0].phys_addr =
                        cpu_to_le32(instance->vf_affiliation_h);
        else
                dcmd->sgl.sge32[0].phys_addr =
                        cpu_to_le32(new_affiliation_h);

        dcmd->sgl.sge32[0].length = cpu_to_le32((MAX_LOGICAL_DRIVES + 1) *
                sizeof(struct MR_LD_VF_AFFILIATION));

        dev_warn(&instance->pdev->dev, "SR-IOV: Getting LD/VF affiliation for "
               "scsi%d\n", instance->host->host_no);


        if (megasas_issue_blocked_cmd(instance, cmd, 0) != DCMD_SUCCESS) {
                dev_warn(&instance->pdev->dev, "SR-IOV: LD/VF affiliation DCMD"
                       " failed with status 0x%x for scsi%d\n",
                       dcmd->cmd_status, instance->host->host_no);
                retval = 1; /* Do a scan if we couldn't get affiliation */
                goto out;
        }

        if (!initial) {
                if (!new_affiliation->ldCount) {
                        dev_warn(&instance->pdev->dev, "SR-IOV: Got new LD/VF "
                               "affiliation for passive path for scsi%d\n",
                               instance->host->host_no);
                        retval = 1;
                        goto out;
                }
                newmap = new_affiliation->map;
                savedmap = instance->vf_affiliation->map;
                thisVf = new_affiliation->thisVf;
                for (i = 0 ; i < new_affiliation->ldCount; i++) {
                        found = 0;
                        for (j = 0; j < instance->vf_affiliation->ldCount;
                             j++) {
                                if (newmap->ref.targetId ==
                                    savedmap->ref.targetId) {
                                        found = 1;
                                        if (newmap->policy[thisVf] !=
                                            savedmap->policy[thisVf]) {
                                                doscan = 1;
                                                goto out;
                                        }
                                }
                                savedmap = (struct MR_LD_VF_MAP *)
                                        ((unsigned char *)savedmap +
                                         savedmap->size);
                        }
                        if (!found && newmap->policy[thisVf] !=
                            MR_LD_ACCESS_HIDDEN) {
                                doscan = 1;
                                goto out;
                        }
                        newmap = (struct MR_LD_VF_MAP *)
                                ((unsigned char *)newmap + newmap->size);
                }

                newmap = new_affiliation->map;
                savedmap = instance->vf_affiliation->map;

                for (i = 0 ; i < instance->vf_affiliation->ldCount; i++) {
                        found = 0;
                        for (j = 0 ; j < new_affiliation->ldCount; j++) {
                                if (savedmap->ref.targetId ==
                                    newmap->ref.targetId) {
                                        found = 1;
                                        if (savedmap->policy[thisVf] !=
                                            newmap->policy[thisVf]) {
                                                doscan = 1;
                                                goto out;
                                        }
                                }
                                newmap = (struct MR_LD_VF_MAP *)
                                        ((unsigned char *)newmap +
                                         newmap->size);
                        }
                        if (!found && savedmap->policy[thisVf] !=
                            MR_LD_ACCESS_HIDDEN) {
                                doscan = 1;
                                goto out;
                        }
                        savedmap = (struct MR_LD_VF_MAP *)
                                ((unsigned char *)savedmap +
                                 savedmap->size);
                }
        }
out:
        if (doscan) {
                dev_warn(&instance->pdev->dev, "SR-IOV: Got new LD/VF "
                       "affiliation for scsi%d\n", instance->host->host_no);
                memcpy(instance->vf_affiliation, new_affiliation,
                       new_affiliation->size);
                retval = 1;
        }

        if (new_affiliation)
                pci_free_consistent(instance->pdev,
                                    (MAX_LOGICAL_DRIVES + 1) *
                                    sizeof(struct MR_LD_VF_AFFILIATION),
                                    new_affiliation, new_affiliation_h);
        megasas_return_cmd(instance, cmd);

        return retval;
}

/* This function will get the current SR-IOV LD/VF affiliation */
static int megasas_get_ld_vf_affiliation(struct megasas_instance *instance,
        int initial)
{
        int retval;

        if (instance->PlasmaFW111)
                retval = megasas_get_ld_vf_affiliation_111(instance, initial);
        else
                retval = megasas_get_ld_vf_affiliation_12(instance, initial);
        return retval;
}

/* This function will tell FW to start the SR-IOV heartbeat */
int megasas_sriov_start_heartbeat(struct megasas_instance *instance,
                                         int initial)
{
        struct megasas_cmd *cmd;
        struct megasas_dcmd_frame *dcmd;
        int retval = 0;

        cmd = megasas_get_cmd(instance);

        if (!cmd) {
                dev_printk(KERN_DEBUG, &instance->pdev->dev, "megasas_sriov_start_heartbeat: "
                       "Failed to get cmd for scsi%d\n",
                       instance->host->host_no);
                return -ENOMEM;
        }

        dcmd = &cmd->frame->dcmd;

        if (initial) {
                instance->hb_host_mem =
                        pci_zalloc_consistent(instance->pdev,
                                              sizeof(struct MR_CTRL_HB_HOST_MEM),
                                              &instance->hb_host_mem_h);
                if (!instance->hb_host_mem) {
                        dev_printk(KERN_DEBUG, &instance->pdev->dev, "SR-IOV: Couldn't allocate"
                               " memory for heartbeat host memory for scsi%d\n",
                               instance->host->host_no);
                        retval = -ENOMEM;
                        goto out;
                }
        }

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

        dcmd->mbox.s[0] = cpu_to_le16(sizeof(struct MR_CTRL_HB_HOST_MEM));
        dcmd->cmd = MFI_CMD_DCMD;
        dcmd->cmd_status = MFI_STAT_INVALID_STATUS;
        dcmd->sge_count = 1;
        dcmd->flags = cpu_to_le16(MFI_FRAME_DIR_BOTH);
        dcmd->timeout = 0;
        dcmd->pad_0 = 0;
        dcmd->data_xfer_len = cpu_to_le32(sizeof(struct MR_CTRL_HB_HOST_MEM));
        dcmd->opcode = cpu_to_le32(MR_DCMD_CTRL_SHARED_HOST_MEM_ALLOC);
        dcmd->sgl.sge32[0].phys_addr = cpu_to_le32(instance->hb_host_mem_h);
        dcmd->sgl.sge32[0].length = cpu_to_le32(sizeof(struct MR_CTRL_HB_HOST_MEM));

        dev_warn(&instance->pdev->dev, "SR-IOV: Starting heartbeat for scsi%d\n",
               instance->host->host_no);

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

        if (retval) {
                dev_warn(&instance->pdev->dev, "SR-IOV: MR_DCMD_CTRL_SHARED_HOST"
                        "_MEM_ALLOC DCMD %s for scsi%d\n",
                        (dcmd->cmd_status == MFI_STAT_INVALID_STATUS) ?
                        "timed out" : "failed", instance->host->host_no);
                retval = 1;
        }

out:
        megasas_return_cmd(instance, cmd);

        return retval;
}

/* Handler for SR-IOV heartbeat */
void megasas_sriov_heartbeat_handler(unsigned long instance_addr)
{
        struct megasas_instance *instance =
                (struct megasas_instance *)instance_addr;

        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;
                mod_timer(&instance->sriov_heartbeat_timer,
                          jiffies + MEGASAS_SRIOV_HEARTBEAT_INTERVAL_VF);
        } else {
                dev_warn(&instance->pdev->dev, "SR-IOV: Heartbeat never "
                       "completed for scsi%d\n", instance->host->host_no);
                schedule_work(&instance->work_init);
        }
}

/**
 * megasas_wait_for_outstanding -       Wait for all outstanding cmds
 * @instance:                           Adapter soft state
 *
 * This function waits for up to MEGASAS_RESET_WAIT_TIME seconds for FW to
 * complete all its outstanding commands. Returns error if one or more IOs
 * are pending after this time period. It also marks the controller dead.
 */
static int megasas_wait_for_outstanding(struct megasas_instance *instance)
{
        int i, sl, outstanding;
        u32 reset_index;
        u32 wait_time = MEGASAS_RESET_WAIT_TIME;
        unsigned long flags;
        struct list_head clist_local;
        struct megasas_cmd *reset_cmd;
        u32 fw_state;

        if (atomic_read(&instance->adprecovery) == MEGASAS_HW_CRITICAL_ERROR) {
                dev_info(&instance->pdev->dev, "%s:%d HBA is killed.\n",
                __func__, __LINE__);
                return FAILED;
        }

        if (atomic_read(&instance->adprecovery) != MEGASAS_HBA_OPERATIONAL) {

                INIT_LIST_HEAD(&clist_local);
                spin_lock_irqsave(&instance->hba_lock, flags);
                list_splice_init(&instance->internal_reset_pending_q,
                                &clist_local);
                spin_unlock_irqrestore(&instance->hba_lock, flags);

                dev_notice(&instance->pdev->dev, "HBA reset wait ...\n");
                for (i = 0; i < wait_time; i++) {
                        msleep(1000);
                        if (atomic_read(&instance->adprecovery) == MEGASAS_HBA_OPERATIONAL)
                                break;
                }

                if (atomic_read(&instance->adprecovery) != MEGASAS_HBA_OPERATIONAL) {
                        dev_notice(&instance->pdev->dev, "reset: Stopping HBA.\n");
                        atomic_set(&instance->adprecovery, MEGASAS_HW_CRITICAL_ERROR);
                        return FAILED;
                }

                reset_index = 0;
                while (!list_empty(&clist_local)) {
                        reset_cmd = list_entry((&clist_local)->next,
                                                struct megasas_cmd, list);
                        list_del_init(&reset_cmd->list);
                        if (reset_cmd->scmd) {
                                reset_cmd->scmd->result = DID_RESET << 16;
                                dev_notice(&instance->pdev->dev, "%d:%p reset [%02x]\n",
                                        reset_index, reset_cmd,
                                        reset_cmd->scmd->cmnd[0]);

                                reset_cmd->scmd->scsi_done(reset_cmd->scmd);
                                megasas_return_cmd(instance, reset_cmd);
                        } else if (reset_cmd->sync_cmd) {
                                dev_notice(&instance->pdev->dev, "%p synch cmds"
                                                "reset queue\n",
                                                reset_cmd);

                                reset_cmd->cmd_status_drv = MFI_STAT_INVALID_STATUS;
                                instance->instancet->fire_cmd(instance,
                                                reset_cmd->frame_phys_addr,
                                                0, instance->reg_set);
                        } else {
                                dev_notice(&instance->pdev->dev, "%p unexpected"
                                        "cmds lst\n",
                                        reset_cmd);
                        }
                        reset_index++;
                }

                return SUCCESS;
        }

        for (i = 0; i < resetwaittime; i++) {
                outstanding = atomic_read(&instance->fw_outstanding);

                if (!outstanding)
                        break;

                if (!(i % MEGASAS_RESET_NOTICE_INTERVAL)) {
                        dev_notice(&instance->pdev->dev, "[%2d]waiting for %d "
                               "commands to complete\n",i,outstanding);
                        /*
                         * Call cmd completion routine. Cmd to be
                         * be completed directly without depending on isr.
                         */
                        megasas_complete_cmd_dpc((unsigned long)instance);
                }

                msleep(1000);
        }

        i = 0;
        outstanding = atomic_read(&instance->fw_outstanding);
        fw_state = instance->instancet->read_fw_status_reg(instance->reg_set) & MFI_STATE_MASK;

        if ((!outstanding && (fw_state == MFI_STATE_OPERATIONAL)))
                goto no_outstanding;

        if (instance->disableOnlineCtrlReset)
                goto kill_hba_and_failed;
        do {
                if ((fw_state == MFI_STATE_FAULT) || atomic_read(&instance->fw_outstanding)) {
                        dev_info(&instance->pdev->dev,
                                "%s:%d waiting_for_outstanding: before issue OCR. FW state = 0x%x, oustanding 0x%x\n",
                                __func__, __LINE__, fw_state, atomic_read(&instance->fw_outstanding));
                        if (i == 3)
                                goto kill_hba_and_failed;
                        megasas_do_ocr(instance);

                        if (atomic_read(&instance->adprecovery) == MEGASAS_HW_CRITICAL_ERROR) {
                                dev_info(&instance->pdev->dev, "%s:%d OCR failed and HBA is killed.\n",
                                __func__, __LINE__);
                                return FAILED;
                        }
                        dev_info(&instance->pdev->dev, "%s:%d waiting_for_outstanding: after issue OCR.\n",
                                __func__, __LINE__);

                        for (sl = 0; sl < 10; sl++)
                                msleep(500);

                        outstanding = atomic_read(&instance->fw_outstanding);

                        fw_state = instance->instancet->read_fw_status_reg(instance->reg_set) & MFI_STATE_MASK;
                        if ((!outstanding && (fw_state == MFI_STATE_OPERATIONAL)))
                                goto no_outstanding;
                }
                i++;
        } while (i <= 3);

no_outstanding:

        dev_info(&instance->pdev->dev, "%s:%d no more pending commands remain after reset handling.\n",
                __func__, __LINE__);
        return SUCCESS;

kill_hba_and_failed:

        /* Reset not supported, kill adapter */
        dev_info(&instance->pdev->dev, "%s:%d killing adapter scsi%d"
                " disableOnlineCtrlReset %d fw_outstanding %d \n",
                __func__, __LINE__, instance->host->host_no, instance->disableOnlineCtrlReset,
                atomic_read(&instance->fw_outstanding));
        megasas_dump_pending_frames(instance);
        megaraid_sas_kill_hba(instance);

        return FAILED;
}

/**
 * megasas_generic_reset -      Generic reset routine
 * @scmd:                       Mid-layer SCSI command
 *
 * This routine implements a generic reset handler for device, bus and host
 * reset requests. Device, bus and host specific reset handlers can use this
 * function after they do their specific tasks.
 */
static int megasas_generic_reset(struct scsi_cmnd *scmd)
{
        int ret_val;
        struct megasas_instance *instance;

        instance = (struct megasas_instance *)scmd->device->host->hostdata;

        scmd_printk(KERN_NOTICE, scmd, "megasas: RESET cmd=%x retries=%x\n",
                 scmd->cmnd[0], scmd->retries);

        if (atomic_read(&instance->adprecovery) == MEGASAS_HW_CRITICAL_ERROR) {
                dev_err(&instance->pdev->dev, "cannot recover from previous reset failures\n");
                return FAILED;
        }

        ret_val = megasas_wait_for_outstanding(instance);
        if (ret_val == SUCCESS)
                dev_notice(&instance->pdev->dev, "reset successful\n");
        else
                dev_err(&instance->pdev->dev, "failed to do reset\n");

        return ret_val;
}

/**
 * megasas_reset_timer - quiesce the adapter if required
 * @scmd:               scsi cmnd
 *
 * Sets the FW busy flag and reduces the host->can_queue if the
 * cmd has not been completed within the timeout period.
 */
static enum
blk_eh_timer_return megasas_reset_timer(struct scsi_cmnd *scmd)
{
        struct megasas_instance *instance;
        unsigned long flags;

        if (time_after(jiffies, scmd->jiffies_at_alloc +
                                (scmd_timeout * 2) * HZ)) {
                return BLK_EH_NOT_HANDLED;
        }

        instance = (struct megasas_instance *)scmd->device->host->hostdata;
        if (!(instance->flag & MEGASAS_FW_BUSY)) {
                /* FW is busy, throttle IO */
                spin_lock_irqsave(instance->host->host_lock, flags);

                instance->host->can_queue = instance->throttlequeuedepth;
                instance->last_time = jiffies;
                instance->flag |= MEGASAS_FW_BUSY;

                spin_unlock_irqrestore(instance->host->host_lock, flags);
        }
        return BLK_EH_RESET_TIMER;
}

/**
 * megasas_reset_device -       Device reset handler entry point
 */
static int megasas_reset_device(struct scsi_cmnd *scmd)
{
        /*
         * First wait for all commands to complete
         */
        return megasas_generic_reset(scmd);
}

/**
 * megasas_reset_bus_host -     Bus & host reset handler entry point
 */
static int megasas_reset_bus_host(struct scsi_cmnd *scmd)
{
        int ret;
        struct megasas_instance *instance;

        instance = (struct megasas_instance *)scmd->device->host->hostdata;

        /*
         * First wait for all commands to complete
         */
        if (instance->ctrl_context)
                ret = megasas_reset_fusion(scmd->device->host, 1);
        else
                ret = megasas_generic_reset(scmd);

        return ret;
}

/**
 * megasas_bios_param - Returns disk geometry for a disk
 * @sdev:               device handle
 * @bdev:               block device
 * @capacity:           drive capacity
 * @geom:               geometry parameters
 */
static int
megasas_bios_param(struct scsi_device *sdev, struct block_device *bdev,
                 sector_t capacity, int geom[])
{
        int heads;
        int sectors;
        sector_t cylinders;
        unsigned long tmp;

        /* Default heads (64) & sectors (32) */
        heads = 64;
        sectors = 32;

        tmp = heads * sectors;
        cylinders = capacity;

        sector_div(cylinders, tmp);

        /*
         * Handle extended translation size for logical drives > 1Gb
         */

        if (capacity >= 0x200000) {
                heads = 255;
                sectors = 63;
                tmp = heads*sectors;
                cylinders = capacity;
                sector_div(cylinders, tmp);
        }

        geom[0] = heads;
        geom[1] = sectors;
        geom[2] = cylinders;

        return 0;
}

static void megasas_aen_polling(struct work_struct *work);

/**
 * megasas_service_aen -        Processes an event notification
 * @instance:                   Adapter soft state
 * @cmd:                        AEN command completed by the ISR
 *
 * For AEN, driver sends a command down to FW that is held by the FW till an
 * event occurs. When an event of interest occurs, FW completes the command
 * that it was previously holding.
 *
 * This routines sends SIGIO signal to processes that have registered with the
 * driver for AEN.
 */
static void
megasas_service_aen(struct megasas_instance *instance, struct megasas_cmd *cmd)
{
        unsigned long flags;

        /*
         * Don't signal app if it is just an aborted previously registered aen
         */
        if ((!cmd->abort_aen) && (instance->unload == 0)) {
                spin_lock_irqsave(&poll_aen_lock, flags);
                megasas_poll_wait_aen = 1;
                spin_unlock_irqrestore(&poll_aen_lock, flags);
                wake_up(&megasas_poll_wait);
                kill_fasync(&megasas_async_queue, SIGIO, POLL_IN);
        }
        else
                cmd->abort_aen = 0;

        instance->aen_cmd = NULL;

        megasas_return_cmd(instance, cmd);

        if ((instance->unload == 0) &&
                ((instance->issuepend_done == 1))) {
                struct megasas_aen_event *ev;

                ev = kzalloc(sizeof(*ev), GFP_ATOMIC);
                if (!ev) {
                        dev_err(&instance->pdev->dev, "megasas_service_aen: out of memory\n");
                } else {
                        ev->instance = instance;
                        instance->ev = ev;
                        INIT_DELAYED_WORK(&ev->hotplug_work,
                                          megasas_aen_polling);
                        schedule_delayed_work(&ev->hotplug_work, 0);
                }
        }
}

static ssize_t
megasas_fw_crash_buffer_store(struct device *cdev,
        struct device_attribute *attr, const char *buf, size_t count)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct megasas_instance *instance =
                (struct megasas_instance *) shost->hostdata;
        int val = 0;
        unsigned long flags;

        if (kstrtoint(buf, 0, &val) != 0)
                return -EINVAL;

        spin_lock_irqsave(&instance->crashdump_lock, flags);
        instance->fw_crash_buffer_offset = val;
        spin_unlock_irqrestore(&instance->crashdump_lock, flags);
        return strlen(buf);
}

static ssize_t
megasas_fw_crash_buffer_show(struct device *cdev,
        struct device_attribute *attr, char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct megasas_instance *instance =
                (struct megasas_instance *) shost->hostdata;
        u32 size;
        unsigned long buff_addr;
        unsigned long dmachunk = CRASH_DMA_BUF_SIZE;
        unsigned long src_addr;
        unsigned long flags;
        u32 buff_offset;

        spin_lock_irqsave(&instance->crashdump_lock, flags);
        buff_offset = instance->fw_crash_buffer_offset;
        if (!instance->crash_dump_buf &&
                !((instance->fw_crash_state == AVAILABLE) ||
                (instance->fw_crash_state == COPYING))) {
                dev_err(&instance->pdev->dev,
                        "Firmware crash dump is not available\n");
                spin_unlock_irqrestore(&instance->crashdump_lock, flags);
                return -EINVAL;
        }

        buff_addr = (unsigned long) buf;

        if (buff_offset > (instance->fw_crash_buffer_size * dmachunk)) {
                dev_err(&instance->pdev->dev,
                        "Firmware crash dump offset is out of range\n");
                spin_unlock_irqrestore(&instance->crashdump_lock, flags);
                return 0;
        }

        size = (instance->fw_crash_buffer_size * dmachunk) - buff_offset;
        size = (size >= PAGE_SIZE) ? (PAGE_SIZE - 1) : size;

        src_addr = (unsigned long)instance->crash_buf[buff_offset / dmachunk] +
                (buff_offset % dmachunk);
        memcpy(buf, (void *)src_addr, size);
        spin_unlock_irqrestore(&instance->crashdump_lock, flags);

        return size;
}

static ssize_t
megasas_fw_crash_buffer_size_show(struct device *cdev,
        struct device_attribute *attr, char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct megasas_instance *instance =
                (struct megasas_instance *) shost->hostdata;

        return snprintf(buf, PAGE_SIZE, "%ld\n", (unsigned long)
                ((instance->fw_crash_buffer_size) * 1024 * 1024)/PAGE_SIZE);
}

static ssize_t
megasas_fw_crash_state_store(struct device *cdev,
        struct device_attribute *attr, const char *buf, size_t count)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct megasas_instance *instance =
                (struct megasas_instance *) shost->hostdata;
        int val = 0;
        unsigned long flags;

        if (kstrtoint(buf, 0, &val) != 0)
                return -EINVAL;

        if ((val <= AVAILABLE || val > COPY_ERROR)) {
                dev_err(&instance->pdev->dev, "application updates invalid "
                        "firmware crash state\n");
                return -EINVAL;
        }

        instance->fw_crash_state = val;

        if ((val == COPIED) || (val == COPY_ERROR)) {
                spin_lock_irqsave(&instance->crashdump_lock, flags);
                megasas_free_host_crash_buffer(instance);
                spin_unlock_irqrestore(&instance->crashdump_lock, flags);
                if (val == COPY_ERROR)
                        dev_info(&instance->pdev->dev, "application failed to "
                                "copy Firmware crash dump\n");
                else
                        dev_info(&instance->pdev->dev, "Firmware crash dump "
                                "copied successfully\n");
        }
        return strlen(buf);
}

static ssize_t
megasas_fw_crash_state_show(struct device *cdev,
        struct device_attribute *attr, char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct megasas_instance *instance =
                (struct megasas_instance *) shost->hostdata;

        return snprintf(buf, PAGE_SIZE, "%d\n", instance->fw_crash_state);
}

static ssize_t
megasas_page_size_show(struct device *cdev,
        struct device_attribute *attr, char *buf)
{
        return snprintf(buf, PAGE_SIZE, "%ld\n", (unsigned long)PAGE_SIZE - 1);
}

static ssize_t
megasas_ldio_outstanding_show(struct device *cdev, struct device_attribute *attr,
        char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct megasas_instance *instance = (struct megasas_instance *)shost->hostdata;

        return snprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&instance->ldio_outstanding));
}

static DEVICE_ATTR(fw_crash_buffer, S_IRUGO | S_IWUSR,
        megasas_fw_crash_buffer_show, megasas_fw_crash_buffer_store);
static DEVICE_ATTR(fw_crash_buffer_size, S_IRUGO,
        megasas_fw_crash_buffer_size_show, NULL);
static DEVICE_ATTR(fw_crash_state, S_IRUGO | S_IWUSR,
        megasas_fw_crash_state_show, megasas_fw_crash_state_store);
static DEVICE_ATTR(page_size, S_IRUGO,
        megasas_page_size_show, NULL);
static DEVICE_ATTR(ldio_outstanding, S_IRUGO,
        megasas_ldio_outstanding_show, NULL);

struct device_attribute *megaraid_host_attrs[] = {
        &dev_attr_fw_crash_buffer_size,
        &dev_attr_fw_crash_buffer,
        &dev_attr_fw_crash_state,
        &dev_attr_page_size,
        &dev_attr_ldio_outstanding,
        NULL,
};

/*
 * Scsi host template for megaraid_sas driver
 */
static struct scsi_host_template megasas_template = {

        .module = THIS_MODULE,
        .name = "Avago SAS based MegaRAID driver",
        .proc_name = "megaraid_sas",
        .slave_configure = megasas_slave_configure,
        .slave_alloc = megasas_slave_alloc,
        .slave_destroy = megasas_slave_destroy,
        .queuecommand = megasas_queue_command,
        .eh_device_reset_handler = megasas_reset_device,
        .eh_bus_reset_handler = megasas_reset_bus_host,
        .eh_host_reset_handler = megasas_reset_bus_host,
        .eh_timed_out = megasas_reset_timer,
        .shost_attrs = megaraid_host_attrs,
        .bios_param = megasas_bios_param,
        .use_clustering = ENABLE_CLUSTERING,
        .change_queue_depth = scsi_change_queue_depth,
        .no_write_same = 1,
};

/**
 * megasas_complete_int_cmd -   Completes an internal command
 * @instance:                   Adapter soft state
 * @cmd:                        Command to be completed
 *
 * The megasas_issue_blocked_cmd() function waits for a command to complete
 * after it issues a command. This function wakes up that waiting routine by
 * calling wake_up() on the wait queue.
 */
static void
megasas_complete_int_cmd(struct megasas_instance *instance,
                         struct megasas_cmd *cmd)
{
        cmd->cmd_status_drv = cmd->frame->io.cmd_status;
        wake_up(&instance->int_cmd_wait_q);
}

/**