text: /*
   *  Linux MegaRAID driver for SAS based RAID controllers
   *
   *  Copyright (c) 2003-2012  LSI Corporation.
   *
   *  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, write to the Free Software
   *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
   *
   *  FILE: megaraid_sas_base.c
   *  Version : v06.506.00.00-rc1
   *
   *  Authors: LSI Corporation
   *           Sreenivas Bagalkote
   *           Sumant Patro
   *           Bo Yang
   *           Adam Radford <linuxraid@lsi.com>
   *
   *  Send feedback to: <megaraidlinux@lsi.com>
   *
   *  Mail to: LSI Corporation, 1621 Barber Lane, Milpitas, CA 95035
   *     ATTN: Linuxraid
   */
  
  #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 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");
  
  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");
  
  MODULE_LICENSE("GPL");
  MODULE_VERSION(MEGASAS_VERSION);
  MODULE_AUTHOR("megaraidlinux@lsi.com");
  MODULE_DESCRIPTION("LSI 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_issue_init_mfi(struct megasas_instance *instance);
  static int megasas_register_aen(struct megasas_instance *instance,
  				u32 seq_num, u32 class_locale_word);
  /*
   * 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_INVADER)},
  	/* Invader */
  	{}
  };
  
  MODULE_DEVICE_TABLE(pci, megasas_pci_table);
  
  static int megasas_mgmt_majorno;
  static 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);
  void megasas_reset_reply_desc(struct megasas_instance *instance);
  u8 MR_ValidateMapInfo(struct MR_FW_RAID_MAP_ALL *map,
  		      struct LD_LOAD_BALANCE_INFO *lbInfo);
  int megasas_reset_fusion(struct Scsi_Host *shost);
  void megasas_fusion_ocr_wq(struct work_struct *work);
  
  void
  megasas_issue_dcmd(struct megasas_instance *instance, struct megasas_cmd *cmd)
  {
  	instance->instancet->fire_cmd(instance,
  		cmd->frame_phys_addr, 0, instance->reg_set);
  }
  
  /**
   * 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->cmd_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 {
  		printk(KERN_ERR "megasas: Command pool empty!\n");
  	}
  
  	spin_unlock_irqrestore(&instance->cmd_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;
  
  	spin_lock_irqsave(&instance->cmd_pool_lock, flags);
  
  	cmd->scmd = NULL;
  	cmd->frame_count = 0;
  	if ((instance->pdev->device != PCI_DEVICE_ID_LSI_FUSION) &&
  	    (instance->pdev->device != PCI_DEVICE_ID_LSI_INVADER) &&
  	    (reset_devices))
  		cmd->frame->hdr.cmd = MFI_CMD_INVALID;
  	list_add_tail(&cmd->list, &instance->cmd_pool);
  
  	spin_unlock_irqrestore(&instance->cmd_pool_lock, flags);
  }
  
  
  /**
  *	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_register_set __iomem * regs)
  {
  	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_register_set __iomem * regs)
  {
  	u32 mask = 0x1f;
  	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);
  	printk(KERN_NOTICE "pcidata = %x\n", pcidata);
  	if (pcidata & 0x2) {
  		printk(KERN_NOTICE "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);
  		printk(KERN_NOTICE "1068 offset handshake read=%x\n", pcidata);
  		if ((pcidata & 0xffff0000) == MFI_1068_FW_READY) {
  			printk(KERN_NOTICE "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)
  {
  	u32 consumer;
  	consumer = *instance->consumer;
  
  	if ((instance->adprecovery != MEGASAS_HBA_OPERATIONAL) &&
  		(*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_register_set __iomem * regs)
  {
  	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_register_set __iomem * regs)
  {
  	u32 mask = 0xFFFFFFFF;
  	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 (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_register_set __iomem *regs)
  {
  	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_register_set __iomem *regs)
  {
  	u32 mask = 0xFFFFFFFF;
  	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_gen2(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(0, &(regs)->inbound_high_queue_port);
  	writel((frame_phys_addr | (frame_count<<1))|1,
  		&(regs)->inbound_low_queue_port);
  	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 (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_register_set __iomem *regs)
  {
  	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_register_set __iomem *regs)
  {
  	u32 mask = 0xFFFFFFFF;
  	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_GEN2_ENABLE_INTERRUPT_MASK) {
  		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			*seq_offset = &reg_set->seq_offset;
  	u32			*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);
  		printk(KERN_NOTICE "RESETGEN2: retry=%x, hostdiag=%x\n",
  					retry, HostDiag);
  
  		if (retry++ >= 100)
  			return 1;
  
  	}
  
  	printk(KERN_NOTICE "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);
  		printk(KERN_NOTICE "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 (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 0xFF 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 = 0xFF;
  	frame_hdr->flags |= MFI_FRAME_DONT_POST_IN_REPLY_QUEUE;
  
  	/*
  	 * Issue the frame using inbound queue port
  	 */
  	instance->instancet->issue_dcmd(instance, cmd);
  
  	/*
  	 * Wait for cmd_status to change
  	 */
  	return wait_and_poll(instance, cmd);
  }
  
  /**
   * megasas_issue_blocked_cmd -	Synchronous wrapper around regular FW cmds
   * @instance:			Adapter soft state
   * @cmd:			Command to be issued
   *
   * 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.
   */
  static int
  megasas_issue_blocked_cmd(struct megasas_instance *instance,
  			  struct megasas_cmd *cmd)
  {
  	cmd->cmd_status = ENODATA;
  
  	instance->instancet->issue_dcmd(instance, cmd);
  
  	wait_event(instance->int_cmd_wait_q, cmd->cmd_status != ENODATA);
  
  	return 0;
  }
  
  /**
   * megasas_issue_blocked_abort_cmd -	Aborts previously issued cmd
   * @instance:				Adapter soft state
   * @cmd_to_abort:			Previously issued cmd to be aborted
   *
   * MFI firmware can abort previously issued AEN command (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)
  {
  	struct megasas_cmd *cmd;
  	struct megasas_abort_frame *abort_fr;
  
  	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 = 0xFF;
  	abort_fr->flags = 0;
  	abort_fr->abort_context = cmd_to_abort->index;
  	abort_fr->abort_mfi_phys_addr_lo = cmd_to_abort->frame_phys_addr;
  	abort_fr->abort_mfi_phys_addr_hi = 0;
  
  	cmd->sync_cmd = 1;
  	cmd->cmd_status = ENODATA;
  
  	instance->instancet->issue_dcmd(instance, cmd);
  
  	/*
  	 * Wait for this cmd to complete
  	 */
  	wait_event(instance->abort_cmd_wait_q, cmd->cmd_status != 0xFF);
  	cmd->sync_cmd = 0;
  
  	megasas_return_cmd(instance, cmd);
  	return 0;
  }
  
  /**
   * 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 = sg_dma_len(os_sgl);
  			mfi_sgl->sge32[i].phys_addr = 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 = sg_dma_len(os_sgl);
  			mfi_sgl->sge64[i].phys_addr = 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 = sg_dma_len(os_sgl);
  			mfi_sgl->sge_skinny[i].phys_addr =
  						sg_dma_address(os_sgl);
  			mfi_sgl->sge_skinny[i].flag = 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(instance, 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 = flags;
  	pthru->data_xfer_len = 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 = 0xFFFF;
  		else
  			pthru->timeout = scp->request->timeout / HZ;
  	}
  
  	/*
  	 * Construct SGL
  	 */
  	if (instance->flag_ieee == 1) {
  		pthru->flags |= MFI_FRAME_SGL64;
  		pthru->sge_count = megasas_make_sgl_skinny(instance, scp,
  						      &pthru->sgl);
  	} else if (IS_DMA64) {
  		pthru->flags |= 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) {
  		printk(KERN_ERR "megasas: DCDB two 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 = 0;
  	pthru->sense_buf_phys_addr_lo = 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(instance, 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 = 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 = (u32) scp->cmnd[4];
  		ldio->start_lba_lo = ((u32) scp->cmnd[1] << 16) |
  		    ((u32) scp->cmnd[2] << 8) | (u32) scp->cmnd[3];
  
  		ldio->start_lba_lo &= 0x1FFFFF;
  	}
  
  	/*
  	 * 10-byte READ(0x28) or WRITE(0x2A) cdb
  	 */
  	else if (scp->cmd_len == 10) {
  		ldio->lba_count = (u32) scp->cmnd[8] |
  		    ((u32) scp->cmnd[7] << 8);
  		ldio->start_lba_lo = ((u32) scp->cmnd[2] << 24) |
  		    ((u32) scp->cmnd[3] << 16) |
  		    ((u32) scp->cmnd[4] << 8) | (u32) scp->cmnd[5];
  	}
  
  	/*
  	 * 12-byte READ(0xA8) or WRITE(0xAA) cdb
  	 */
  	else if (scp->cmd_len == 12) {
  		ldio->lba_count = ((u32) scp->cmnd[6] << 24) |
  		    ((u32) scp->cmnd[7] << 16) |
  		    ((u32) scp->cmnd[8] << 8) | (u32) scp->cmnd[9];
  
  		ldio->start_lba_lo = ((u32) scp->cmnd[2] << 24) |
  		    ((u32) scp->cmnd[3] << 16) |
  		    ((u32) scp->cmnd[4] << 8) | (u32) scp->cmnd[5];
  	}
  
  	/*
  	 * 16-byte READ(0x88) or WRITE(0x8A) cdb
  	 */
  	else if (scp->cmd_len == 16) {
  		ldio->lba_count = ((u32) scp->cmnd[10] << 24) |
  		    ((u32) scp->cmnd[11] << 16) |
  		    ((u32) scp->cmnd[12] << 8) | (u32) scp->cmnd[13];
  
  		ldio->start_lba_lo = ((u32) scp->cmnd[6] << 24) |
  		    ((u32) scp->cmnd[7] << 16) |
  		    ((u32) scp->cmnd[8] << 8) | (u32) scp->cmnd[9];
  
  		ldio->start_lba_hi = ((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 |= MFI_FRAME_SGL64;
  		ldio->sge_count = megasas_make_sgl_skinny(instance, scp,
  					      &ldio->sgl);
  	} else if (IS_DMA64) {
  		ldio->flags |= 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) {
  		printk(KERN_ERR "megasas: 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 = 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_is_ldio -		Checks if the cmd is for logical drive
   * @scmd:			SCSI command
   *
   * Called by megasas_queue_command to find out if the command to be queued
   * is a logical drive command
   */
  inline int megasas_is_ldio(struct scsi_cmnd *cmd)
  {
  	if (!MEGASAS_IS_LOGICAL(cmd))
  		return 0;
  	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:
  		return 1;
  	default:
  		return 0;
  	}
  }
  
   /**
   * 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;
  
  	printk(KERN_ERR "\nmegasas[%d]: Dumping Frame Phys Address of all pending cmds in FW\n",instance->host->host_no);
  	printk(KERN_ERR "megasas[%d]: Total OS Pending cmds : %d\n",instance->host->host_no,atomic_read(&instance->fw_outstanding));
  	if (IS_DMA64)
  		printk(KERN_ERR "\nmegasas[%d]: 64 bit SGLs were sent to FW\n",instance->host->host_no);
  	else
  		printk(KERN_ERR "\nmegasas[%d]: 32 bit SGLs were sent to FW\n",instance->host->host_no);
  
  	printk(KERN_ERR "megasas[%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;
  		printk(KERN_ERR "megasas[%d]: Frame addr :0x%08lx : ",instance->host->host_no,(unsigned long)cmd->frame_phys_addr);
  		if (megasas_is_ldio(cmd->scmd)){
  			ldio = (struct megasas_io_frame *)cmd->frame;
  			mfi_sgl = &ldio->sgl;
  			sgcount = ldio->sge_count;
  			printk(KERN_ERR "megasas[%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, ldio->start_lba_lo,ldio->start_lba_hi,ldio->sense_buf_phys_addr_lo,sgcount);
  		}
  		else {
  			pthru = (struct megasas_pthru_frame *) cmd->frame;
  			mfi_sgl = &pthru->sgl;
  			sgcount = pthru->sge_count;
  			printk(KERN_ERR "megasas[%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 , pthru->data_xfer_len,pthru->sense_buf_phys_addr_lo,sgcount);
  		}
  	if(megasas_dbg_lvl & MEGASAS_DBG_LVL){
  		for (n = 0; n < sgcount; n++){
  			if (IS_DMA64)
  				printk(KERN_ERR "megasas: sgl len : 0x%x, sgl addr : 0x%08lx ",mfi_sgl->sge64[n].length , (unsigned long)mfi_sgl->sge64[n].phys_addr) ;
  			else
  				printk(KERN_ERR "megasas: sgl len : 0x%x, sgl addr : 0x%x ",mfi_sgl->sge32[n].length , mfi_sgl->sge32[n].phys_addr) ;
  			}
  		}
  		printk(KERN_ERR "\n");
  	} /*for max_cmd*/
  	printk(KERN_ERR "\nmegasas[%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){
  			printk(KERN_ERR "0x%08lx : ", (unsigned long)cmd->frame_phys_addr);
  		}
  	}
  	printk(KERN_ERR "megasas[%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_is_ldio(scmd))
  		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 1;
  }
  
  
  /**
   * megasas_queue_command -	Queue entry point
   * @scmd:			SCSI command to be queued
   * @done:			Callback entry point
   */
  static int
  megasas_queue_command_lck(struct scsi_cmnd *scmd, void (*done) (struct scsi_cmnd *))
  {
  	struct megasas_instance *instance;
  	unsigned long flags;
  
  	instance = (struct megasas_instance *)
  	    scmd->device->host->hostdata;
  
  	if (instance->issuepend_done == 0)
  		return SCSI_MLQUEUE_HOST_BUSY;
  
  	spin_lock_irqsave(&instance->hba_lock, flags);
  	if (instance->adprecovery != MEGASAS_HBA_OPERATIONAL) {
  		spin_unlock_irqrestore(&instance->hba_lock, flags);
  		return SCSI_MLQUEUE_HOST_BUSY;
  	}
  
  	spin_unlock_irqrestore(&instance->hba_lock, flags);
  
  	scmd->scsi_done = done;
  	scmd->result = 0;
  
  	if (MEGASAS_IS_LOGICAL(scmd) &&
  	    (scmd->device->id >= MEGASAS_MAX_LD || scmd->device->lun)) {
  		scmd->result = DID_BAD_TARGET << 16;
  		goto out_done;
  	}
  
  	/*
  	 * FW takes care of flush cache on its own for Virtual Disk.
  	 * No need to send it down for VD. For JBOD send SYNCHRONIZE_CACHE to FW.
  	 */
  	if ((scmd->cmnd[0] == SYNCHRONIZE_CACHE) && MEGASAS_IS_LOGICAL(scmd)) {
  		scmd->result = DID_OK << 16;
  		goto out_done;
  	}
  
  	if (instance->instancet->build_and_issue_cmd(instance, scmd)) {
  		printk(KERN_ERR "megasas: Err returned from build_and_issue_cmd\n");
  		return SCSI_MLQUEUE_HOST_BUSY;
  	}
  
  	return 0;
  
   out_done:
  	done(scmd);
  	return 0;
  }
  
  static DEF_SCSI_QCMD(megasas_queue_command)
  
  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;
  }
  
  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);
  
  	/*
  	* Don't export physical disk devices to the disk driver.
  	*
  	* FIXME: Currently we don't export them to the midlayer at all.
  	*        That will be fixed once LSI engineers have audited the
  	*        firmware for possible issues.
  	*/
  	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) {
  			blk_queue_rq_timeout(sdev->request_queue,
  				MEGASAS_DEFAULT_CMD_TIMEOUT * HZ);
  			return 0;
  		}
  		return -ENXIO;
  	}
  
  	/*
  	* The RAID firmware may require extended timeouts.
  	*/
  	blk_queue_rq_timeout(sdev->request_queue,
  		MEGASAS_DEFAULT_CMD_TIMEOUT * HZ);
  	return 0;
  }
  
  static int megasas_slave_alloc(struct scsi_device *sdev)
  {
  	u16             pd_index = 0;
  	struct megasas_instance *instance ;
  	instance = megasas_lookup_instance(sdev->host->host_no);
  	if ((sdev->channel < MEGASAS_MAX_PD_CHANNELS) &&
  				(sdev->type == TYPE_DISK)) {
  		/*
  		 * Open the OS scan to the SYSTEM PD
  		 */
  		pd_index =
  			(sdev->channel * MEGASAS_MAX_DEV_PER_CHANNEL) +
  			sdev->id;
  		if ((instance->pd_list[pd_index].driveState ==
  					MR_PD_STATE_SYSTEM) &&
  			(instance->pd_list[pd_index].driveType ==
  						TYPE_DISK)) {
  			return 0;
  		}
  		return -ENXIO;
  	}
  	return 0;
  }
  
  void megaraid_sas_kill_hba(struct megasas_instance *instance)
  {
  	if ((instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0073SKINNY) ||
  	    (instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0071SKINNY) ||
  	    (instance->pdev->device == PCI_DEVICE_ID_LSI_FUSION) ||
  	    (instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER)) {
  		writel(MFI_STOP_ADP, &instance->reg_set->doorbell);
  	} else {
  		writel(MFI_STOP_ADP, &instance->reg_set->inbound_doorbell);
  	}
  }
  
   /**
    * 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;
  		if ((instance->pdev->device ==
  			PCI_DEVICE_ID_LSI_SAS0073SKINNY) ||
  			(instance->pdev->device ==
  			PCI_DEVICE_ID_LSI_SAS0071SKINNY)) {
  			instance->host->can_queue =
  				instance->max_fw_cmds - MEGASAS_SKINNY_INT_CMDS;
  		} else
  			instance->host->can_queue =
  				instance->max_fw_cmds - MEGASAS_INT_CMDS;
  
  		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 (instance->adprecovery == MEGASAS_HW_CRITICAL_ERROR )
  		return;
  
  	spin_lock_irqsave(&instance->completion_lock, flags);
  
  	producer = *instance->producer;
  	consumer = *instance->consumer;
  
  	while (consumer != producer) {
  		context = instance->reply_queue[consumer];
  		if (context >= instance->max_fw_cmds) {
  			printk(KERN_ERR "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 = producer;
  
  	spin_unlock_irqrestore(&instance->completion_lock, flags);
  
  	/*
  	 * Check if we can restore can_queue
  	 */
  	megasas_check_and_restore_queue_depth(instance);
  }
  
  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     = MEGASAS_ADPRESET_INPROG_SIGN;
  	}
  	instance->instancet->disable_intr(instance->reg_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);
  }
  
  /**
   * 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;
  	u32 reset_index;
  	u32 wait_time = MEGASAS_RESET_WAIT_TIME;
  	u8 adprecovery;
  	unsigned long flags;
  	struct list_head clist_local;
  	struct megasas_cmd *reset_cmd;
  	u32 fw_state;
  	u8 kill_adapter_flag;
  
  	spin_lock_irqsave(&instance->hba_lock, flags);
  	adprecovery = instance->adprecovery;
  	spin_unlock_irqrestore(&instance->hba_lock, flags);
  
  	if (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);
  
  		printk(KERN_NOTICE "megasas: HBA reset wait ...\n");
  		for (i = 0; i < wait_time; i++) {
  			msleep(1000);
  			spin_lock_irqsave(&instance->hba_lock, flags);
  			adprecovery = instance->adprecovery;
  			spin_unlock_irqrestore(&instance->hba_lock, flags);
  			if (adprecovery == MEGASAS_HBA_OPERATIONAL)
  				break;
  		}
  
  		if (adprecovery != MEGASAS_HBA_OPERATIONAL) {
  			printk(KERN_NOTICE "megasas: reset: Stopping HBA.\n");
  			spin_lock_irqsave(&instance->hba_lock, flags);
  			instance->adprecovery	= MEGASAS_HW_CRITICAL_ERROR;
  			spin_unlock_irqrestore(&instance->hba_lock, flags);
  			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;
  				printk(KERN_NOTICE "%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) {
  				printk(KERN_NOTICE "megasas:%p synch cmds"
  						"reset queue\n",
  						reset_cmd);
  
  				reset_cmd->cmd_status = ENODATA;
  				instance->instancet->fire_cmd(instance,
  						reset_cmd->frame_phys_addr,
  						0, instance->reg_set);
  			} else {
  				printk(KERN_NOTICE "megasas: %p unexpected"
  					"cmds lst\n",
  					reset_cmd);
  			}
  			reset_index++;
  		}
  
  		return SUCCESS;
  	}
  
  	for (i = 0; i < resetwaittime; i++) {
  
  		int outstanding = atomic_read(&instance->fw_outstanding);
  
  		if (!outstanding)
  			break;
  
  		if (!(i % MEGASAS_RESET_NOTICE_INTERVAL)) {
  			printk(KERN_NOTICE "megasas: [%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;
  	kill_adapter_flag = 0;
  	do {
  		fw_state = instance->instancet->read_fw_status_reg(
  					instance->reg_set) & MFI_STATE_MASK;
  		if ((fw_state == MFI_STATE_FAULT) &&
  			(instance->disableOnlineCtrlReset == 0)) {
  			if (i == 3) {
  				kill_adapter_flag = 2;
  				break;
  			}
  			megasas_do_ocr(instance);
  			kill_adapter_flag = 1;
  
  			/* wait for 1 secs to let FW finish the pending cmds */
  			msleep(1000);
  		}
  		i++;
  	} while (i <= 3);
  
  	if (atomic_read(&instance->fw_outstanding) &&
  					!kill_adapter_flag) {
  		if (instance->disableOnlineCtrlReset == 0) {
  
  			megasas_do_ocr(instance);
  
  			/* wait for 5 secs to let FW finish the pending cmds */
  			for (i = 0; i < wait_time; i++) {
  				int outstanding =
  					atomic_read(&instance->fw_outstanding);
  				if (!outstanding)
  					return SUCCESS;
  				msleep(1000);
  			}
  		}
  	}
  
  	if (atomic_read(&instance->fw_outstanding) ||
  					(kill_adapter_flag == 2)) {
  		printk(KERN_NOTICE "megaraid_sas: pending cmds after reset\n");
  		/*
  		* Send signal to FW to stop processing any pending cmds.
  		* The controller will be taken offline by the OS now.
  		*/
  		if ((instance->pdev->device ==
  			PCI_DEVICE_ID_LSI_SAS0073SKINNY) ||
  			(instance->pdev->device ==
  			PCI_DEVICE_ID_LSI_SAS0071SKINNY)) {
  			writel(MFI_STOP_ADP,
  				&instance->reg_set->doorbell);
  		} else {
  			writel(MFI_STOP_ADP,
  				&instance->reg_set->inbound_doorbell);
  		}
  		megasas_dump_pending_frames(instance);
  		spin_lock_irqsave(&instance->hba_lock, flags);
  		instance->adprecovery	= MEGASAS_HW_CRITICAL_ERROR;
  		spin_unlock_irqrestore(&instance->hba_lock, flags);
  		return FAILED;
  	}
  
  	printk(KERN_NOTICE "megaraid_sas: no pending cmds after reset\n");
  
  	return SUCCESS;
  }
  
  /**
   * 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 (instance->adprecovery == MEGASAS_HW_CRITICAL_ERROR) {
  		printk(KERN_ERR "megasas: cannot recover from previous reset "
  		       "failures\n");
  		return FAILED;
  	}
  
  	ret_val = megasas_wait_for_outstanding(instance);
  	if (ret_val == SUCCESS)
  		printk(KERN_NOTICE "megasas: reset successful \n");
  	else
  		printk(KERN_ERR "megasas: 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 +
  				(MEGASAS_DEFAULT_CMD_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)
  {
  	int ret;
  
  	/*
  	 * First wait for all commands to complete
  	 */
  	ret = megasas_generic_reset(scmd);
  
  	return ret;
  }
  
  /**
   * 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->pdev->device == PCI_DEVICE_ID_LSI_FUSION) ||
  	    (instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER))
  		ret = megasas_reset_fusion(scmd->device->host);
  	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) {
  			printk(KERN_ERR "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 int megasas_change_queue_depth(struct scsi_device *sdev,
  				      int queue_depth, int reason)
  {
  	if (reason != SCSI_QDEPTH_DEFAULT)
  		return -EOPNOTSUPP;
  
  	if (queue_depth > sdev->host->can_queue)
  		queue_depth = sdev->host->can_queue;
  	scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev),
  				queue_depth);
  
  	return queue_depth;
  }
  
  /*
   * Scsi host template for megaraid_sas driver
   */
  static struct scsi_host_template megasas_template = {
  
  	.module = THIS_MODULE,
  	.name = "LSI SAS based MegaRAID driver",
  	.proc_name = "megaraid_sas",
  	.slave_configure = megasas_slave_configure,
  	.slave_alloc = megasas_slave_alloc,
  	.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,
  	.bios_param = megasas_bios_param,
  	.use_clustering = ENABLE_CLUSTERING,
  	.change_queue_depth = megasas_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 = cmd->frame->io.cmd_status;
  
  	if (cmd->cmd_status == ENODATA) {
  		cmd->cmd_status = 0;
  	}
  	wake_up(&instance->int_cmd_wait_q);
  }
  
  /**
   * megasas_complete_abort -	Completes aborting a command
   * @instance:			Adapter soft state
   * @cmd:			Cmd that was issued to abort another cmd
   *
   * The megasas_issue_blocked_abort_cmd() function waits on abort_cmd_wait_q
   * after it issues an abort on a previously issued command. This function
   * wakes up all functions waiting on the same wait queue.
   */
  static void
  megasas_complete_abort(struct megasas_instance *instance,
  		       struct megasas_cmd *cmd)
  {
  	if (cmd->sync_cmd) {
  		cmd->sync_cmd = 0;
  		cmd->cmd_status = 0;
  		wake_up(&instance->abort_cmd_wait_q);
  	}
  
  	return;
  }
  
  /**
   * megasas_complete_cmd -	Completes a command
   * @instance:			Adapter soft state
   * @cmd:			Command to be completed
   * @alt_status:			If non-zero, use this value as status to
   * 				SCSI mid-layer instead of the value returned
   * 				by the FW. This should be used if caller wants
   * 				an alternate status (as in the case of aborted
   * 				commands)
   */
  void
  megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
  		     u8 alt_status)
  {
  	int exception = 0;
  	struct megasas_header *hdr = &cmd->frame->hdr;
  	unsigned long flags;
  	struct fusion_context *fusion = instance->ctrl_context;
  
  	/* flag for the retry reset */
  	cmd->retry_for_fw_reset = 0;
  
  	if (cmd->scmd)
  		cmd->scmd->SCp.ptr = NULL;
  
  	switch (hdr->cmd) {
  	case MFI_CMD_INVALID:
  		/* Some older 1068 controller FW may keep a pended
  		   MR_DCMD_CTRL_EVENT_GET_INFO left over from the main kernel
  		   when booting the kdump kernel.  Ignore this command to
  		   prevent a kernel panic on shutdown of the kdump kernel. */
  		printk(KERN_WARNING "megaraid_sas: MFI_CMD_INVALID command "
  		       "completed.\n");
  		printk(KERN_WARNING "megaraid_sas: If you have a controller "
  		       "other than PERC5, please upgrade your firmware.\n");
  		break;
  	case MFI_CMD_PD_SCSI_IO:
  	case MFI_CMD_LD_SCSI_IO:
  
  		/*
  		 * MFI_CMD_PD_SCSI_IO and MFI_CMD_LD_SCSI_IO could have been
  		 * issued either through an IO path or an IOCTL path. If it
  		 * was via IOCTL, we will send it to internal completion.
  		 */
  		if (cmd->sync_cmd) {
  			cmd->sync_cmd = 0;
  			megasas_complete_int_cmd(instance, cmd);
  			break;
  		}
  
  	case MFI_CMD_LD_READ:
  	case MFI_CMD_LD_WRITE:
  
  		if (alt_status) {
  			cmd->scmd->result = alt_status << 16;
  			exception = 1;
  		}
  
  		if (exception) {
  
  			atomic_dec(&instance->fw_outstanding);
  
  			scsi_dma_unmap(cmd->scmd);
  			cmd->scmd->scsi_done(cmd->scmd);
  			megasas_return_cmd(instance, cmd);
  
  			break;
  		}
  
  		switch (hdr->cmd_status) {
  
  		case MFI_STAT_OK:
  			cmd->scmd->result = DID_OK << 16;
  			break;
  
  		case MFI_STAT_SCSI_IO_FAILED:
  		case MFI_STAT_LD_INIT_IN_PROGRESS:
  			cmd->scmd->result =
  			    (DID_ERROR << 16) | hdr->scsi_status;
  			break;
  
  		case MFI_STAT_SCSI_DONE_WITH_ERROR:
  
  			cmd->scmd->result = (DID_OK << 16) | hdr->scsi_status;
  
  			if (hdr->scsi_status == SAM_STAT_CHECK_CONDITION) {
  				memset(cmd->scmd->sense_buffer, 0,
  				       SCSI_SENSE_BUFFERSIZE);
  				memcpy(cmd->scmd->sense_buffer, cmd->sense,
  				       hdr->sense_len);
  
  				cmd->scmd->result |= DRIVER_SENSE << 24;
  			}
  
  			break;
  
  		case MFI_STAT_LD_OFFLINE:
  		case MFI_STAT_DEVICE_NOT_FOUND:
  			cmd->scmd->result = DID_BAD_TARGET << 16;
  			break;
  
  		default:
  			printk(KERN_DEBUG "megasas: MFI FW status %#x\n",
  			       hdr->cmd_status);
  			cmd->scmd->result = DID_ERROR << 16;
  			break;
  		}
  
  		atomic_dec(&instance->fw_outstanding);
  
  		scsi_dma_unmap(cmd->scmd);
  		cmd->scmd->scsi_done(cmd->scmd);
  		megasas_return_cmd(instance, cmd);
  
  		break;
  
  	case MFI_CMD_SMP:
  	case MFI_CMD_STP:
  	case MFI_CMD_DCMD:
  		/* Check for LD map update */
  		if ((cmd->frame->dcmd.opcode == MR_DCMD_LD_MAP_GET_INFO) &&
  		    (cmd->frame->dcmd.mbox.b[1] == 1)) {
  			spin_lock_irqsave(instance->host->host_lock, flags);
  			if (cmd->frame->hdr.cmd_status != 0) {
  				if (cmd->frame->hdr.cmd_status !=
  				    MFI_STAT_NOT_FOUND)
  					printk(KERN_WARNING "megasas: map sync"
  					       "failed, status = 0x%x.\n",
  					       cmd->frame->hdr.cmd_status);
  				else {
  					megasas_return_cmd(instance, cmd);
  					spin_unlock_irqrestore(
  						instance->host->host_lock,
  						flags);
  					break;
  				}
  			} else
  				instance->map_id++;
  			megasas_return_cmd(instance, cmd);
  			if (MR_ValidateMapInfo(
  				    fusion->ld_map[(instance->map_id & 1)],
  				    fusion->load_balance_info))
  				fusion->fast_path_io = 1;
  			else
  				fusion->fast_path_io = 0;
  			megasas_sync_map_info(instance);
  			spin_unlock_irqrestore(instance->host->host_lock,
  					       flags);
  			break;
  		}
  		if (cmd->frame->dcmd.opcode == MR_DCMD_CTRL_EVENT_GET_INFO ||
  			cmd->frame->dcmd.opcode == MR_DCMD_CTRL_EVENT_GET) {
  			spin_lock_irqsave(&poll_aen_lock, flags);
  			megasas_poll_wait_aen = 0;
  			spin_unlock_irqrestore(&poll_aen_lock, flags);
  		}
  
  		/*
  		 * See if got an event notification
  		 */
  		if (cmd->frame->dcmd.opcode == MR_DCMD_CTRL_EVENT_WAIT)
  			megasas_service_aen(instance, cmd);
  		else
  			megasas_complete_int_cmd(instance, cmd);
  
  		break;
  
  	case MFI_CMD_ABORT:
  		/*
  		 * Cmd issued to abort another cmd returned
  		 */
  		megasas_complete_abort(instance, cmd);
  		break;
  
  	default:
  		printk("megasas: Unknown command completed! [0x%X]\n",
  		       hdr->cmd);
  		break;
  	}
  }
  
  /**
   * megasas_issue_pending_cmds_again -	issue all pending cmds
   *                              	in FW again because of the fw reset
   * @instance:				Adapter soft state
   */
  static inline void
  megasas_issue_pending_cmds_again(struct megasas_instance *instance)
  {
  	struct megasas_cmd *cmd;
  	struct list_head clist_local;
  	union megasas_evt_class_locale class_locale;
  	unsigned long flags;
  	u32 seq_num;
  
  	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);
  
  	while (!list_empty(&clist_local)) {
  		cmd	= list_entry((&clist_local)->next,
  					struct megasas_cmd, list);
  		list_del_init(&cmd->list);
  
  		if (cmd->sync_cmd || cmd->scmd) {
  			printk(KERN_NOTICE "megaraid_sas: command %p, %p:%d"
  				"detected to be pending while HBA reset.\n",
  					cmd, cmd->scmd, cmd->sync_cmd);
  
  			cmd->retry_for_fw_reset++;
  
  			if (cmd->retry_for_fw_reset == 3) {
  				printk(KERN_NOTICE "megaraid_sas: cmd %p, %p:%d"
  					"was tried multiple times during reset."
  					"Shutting down the HBA\n",
  					cmd, cmd->scmd, cmd->sync_cmd);
  				megaraid_sas_kill_hba(instance);
  
  				instance->adprecovery =
  						MEGASAS_HW_CRITICAL_ERROR;
  				return;
  			}
  		}
  
  		if (cmd->sync_cmd == 1) {
  			if (cmd->scmd) {
  				printk(KERN_NOTICE "megaraid_sas: unexpected"
  					"cmd attached to internal command!\n");
  			}
  			printk(KERN_NOTICE "megasas: %p synchronous cmd"
  						"on the internal reset queue,"
  						"issue it again.\n", cmd);
  			cmd->cmd_status = ENODATA;
  			instance->instancet->fire_cmd(instance,
  							cmd->frame_phys_addr ,
  							0, instance->reg_set);
  		} else if (cmd->scmd) {
  			printk(KERN_NOTICE "megasas: %p scsi cmd [%02x]"
  			"detected on the internal queue, issue again.\n",
  			cmd, cmd->scmd->cmnd[0]);
  
  			atomic_inc(&instance->fw_outstanding);
  			instance->instancet->fire_cmd(instance,
  					cmd->frame_phys_addr,
  					cmd->frame_count-1, instance->reg_set);
  		} else {
  			printk(KERN_NOTICE "megasas: %p unexpected cmd on the"
  				"internal reset defer list while re-issue!!\n",
  				cmd);
  		}
  	}
  
  	if (instance->aen_cmd) {
  		printk(KERN_NOTICE "megaraid_sas: aen_cmd in def process\n");
  		megasas_return_cmd(instance, instance->aen_cmd);
  
  		instance->aen_cmd	= NULL;
  	}
  
  	/*
  	* Initiate AEN (Asynchronous Event Notification)
  	*/
  	seq_num = instance->last_seq_num;
  	class_locale.members.reserved = 0;
  	class_locale.members.locale = MR_EVT_LOCALE_ALL;
  	class_locale.members.class = MR_EVT_CLASS_DEBUG;
  
  	megasas_register_aen(instance, seq_num, class_locale.word);
  }
  
  /**
   * Move the internal reset pending commands to a deferred queue.
   *
   * We move the commands pending at internal reset time to a
   * pending queue. This queue would be flushed after successful
   * completion of the internal reset sequence. if the internal reset
   * did not complete in time, the kernel reset handler would flush
   * these commands.
   **/
  static void
  megasas_internal_reset_defer_cmds(struct megasas_instance *instance)
  {
  	struct megasas_cmd *cmd;
  	int i;
  	u32 max_cmd = instance->max_fw_cmds;
  	u32 defer_index;
  	unsigned long flags;
  
  	defer_index     = 0;
  	spin_lock_irqsave(&instance->cmd_pool_lock, flags);
  	for (i = 0; i < max_cmd; i++) {
  		cmd = instance->cmd_list[i];
  		if (cmd->sync_cmd == 1 || cmd->scmd) {
  			printk(KERN_NOTICE "megasas: moving cmd[%d]:%p:%d:%p"
  					"on the defer queue as internal\n",
  				defer_index, cmd, cmd->sync_cmd, cmd->scmd);
  
  			if (!list_empty(&cmd->list)) {
  				printk(KERN_NOTICE "megaraid_sas: ERROR while"
  					" moving this cmd:%p, %d %p, it was"
  					"discovered on some list?\n",
  					cmd, cmd->sync_cmd, cmd->scmd);
  
  				list_del_init(&cmd->list);
  			}
  			defer_index++;
  			list_add_tail(&cmd->list,
  				&instance->internal_reset_pending_q);
  		}
  	}
  	spin_unlock_irqrestore(&instance->cmd_pool_lock, flags);
  }
  
  
  static void
  process_fw_state_change_wq(struct work_struct *work)
  {
  	struct megasas_instance *instance =
  		container_of(work, struct megasas_instance, work_init);
  	u32 wait;
  	unsigned long flags;
  
  	if (instance->adprecovery != MEGASAS_ADPRESET_SM_INFAULT) {
  		printk(KERN_NOTICE "megaraid_sas: error, recovery st %x \n",
  				instance->adprecovery);
  		return ;
  	}
  
  	if (instance->adprecovery == MEGASAS_ADPRESET_SM_INFAULT) {
  		printk(KERN_NOTICE "megaraid_sas: FW detected to be in fault"
  					"state, restarting it...\n");
  
  		instance->instancet->disable_intr(instance->reg_set);
  		atomic_set(&instance->fw_outstanding, 0);
  
  		atomic_set(&instance->fw_reset_no_pci_access, 1);
  		instance->instancet->adp_reset(instance, instance->reg_set);
  		atomic_set(&instance->fw_reset_no_pci_access, 0 );
  
  		printk(KERN_NOTICE "megaraid_sas: FW restarted successfully,"
  					"initiating next stage...\n");
  
  		printk(KERN_NOTICE "megaraid_sas: HBA recovery state machine,"
  					"state 2 starting...\n");
  
  		/*waitting for about 20 second before start the second init*/
  		for (wait = 0; wait < 30; wait++) {
  			msleep(1000);
  		}
  
  		if (megasas_transition_to_ready(instance, 1)) {
  			printk(KERN_NOTICE "megaraid_sas:adapter not ready\n");
  
  			megaraid_sas_kill_hba(instance);
  			instance->adprecovery	= MEGASAS_HW_CRITICAL_ERROR;
  			return ;
  		}
  
  		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 = *instance->producer;
  		} else {
  			*instance->consumer = 0;
  			*instance->producer = 0;
  		}
  
  		megasas_issue_init_mfi(instance);
  
  		spin_lock_irqsave(&instance->hba_lock, flags);
  		instance->adprecovery	= MEGASAS_HBA_OPERATIONAL;
  		spin_unlock_irqrestore(&instance->hba_lock, flags);
  		instance->instancet->enable_intr(instance->reg_set);
  
  		megasas_issue_pending_cmds_again(instance);
  		instance->issuepend_done = 1;
  	}
  	return ;
  }
  
  /**
   * megasas_deplete_reply_queue -	Processes all completed commands
   * @instance:				Adapter soft state
   * @alt_status:				Alternate status to be returned to
   * 					SCSI mid-layer instead of the status
   * 					returned by the FW
   * Note: this must be called with hba lock held
   */
  static int
  megasas_deplete_reply_queue(struct megasas_instance *instance,
  					u8 alt_status)
  {
  	u32 mfiStatus;
  	u32 fw_state;
  
  	if ((mfiStatus = instance->instancet->check_reset(instance,
  					instance->reg_set)) == 1) {
  		return IRQ_HANDLED;
  	}
  
  	if ((mfiStatus = instance->instancet->clear_intr(
  						instance->reg_set)
  						) == 0) {
  		/* Hardware may not set outbound_intr_status in MSI-X mode */
  		if (!instance->msix_vectors)
  			return IRQ_NONE;
  	}
  
  	instance->mfiStatus = mfiStatus;
  
  	if ((mfiStatus & MFI_INTR_FLAG_FIRMWARE_STATE_CHANGE)) {
  		fw_state = instance->instancet->read_fw_status_reg(
  				instance->reg_set) & MFI_STATE_MASK;
  
  		if (fw_state != MFI_STATE_FAULT) {
  			printk(KERN_NOTICE "megaraid_sas: fw state:%x\n",
  						fw_state);
  		}
  
  		if ((fw_state == MFI_STATE_FAULT) &&
  				(instance->disableOnlineCtrlReset == 0)) {
  			printk(KERN_NOTICE "megaraid_sas: wait adp restart\n");
  
  			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 =
  					MEGASAS_ADPRESET_INPROG_SIGN;
  			}
  
  
  			instance->instancet->disable_intr(instance->reg_set);
  			instance->adprecovery	= MEGASAS_ADPRESET_SM_INFAULT;
  			instance->issuepend_done = 0;
  
  			atomic_set(&instance->fw_outstanding, 0);
  			megasas_internal_reset_defer_cmds(instance);
  
  			printk(KERN_NOTICE "megasas: fwState=%x, stage:%d\n",
  					fw_state, instance->adprecovery);
  
  			schedule_work(&instance->work_init);
  			return IRQ_HANDLED;
  
  		} else {
  			printk(KERN_NOTICE "megasas: fwstate:%x, dis_OCR=%x\n",
  				fw_state, instance->disableOnlineCtrlReset);
  		}
  	}
  
  	tasklet_schedule(&instance->isr_tasklet);
  	return IRQ_HANDLED;
  }
  /**
   * megasas_isr - isr entry point
   */
  static irqreturn_t megasas_isr(int irq, void *devp)
  {
  	struct megasas_irq_context *irq_context = devp;
  	struct megasas_instance *instance = irq_context->instance;
  	unsigned long flags;
  	irqreturn_t	rc;
  
  	if (atomic_read(&instance->fw_reset_no_pci_access))
  		return IRQ_HANDLED;
  
  	spin_lock_irqsave(&instance->hba_lock, flags);
  	rc =  megasas_deplete_reply_queue(instance, DID_OK);
  	spin_unlock_irqrestore(&instance->hba_lock, flags);
  
  	return rc;
  }
  
  /**
   * megasas_transition_to_ready -	Move the FW to READY state
   * @instance:				Adapter soft state
   *
   * During the initialization, FW passes can potentially be in any one of
   * several possible states. If the FW in operational, waiting-for-handshake
   * states, driver must take steps to bring it to ready state. Otherwise, it
   * has to wait for the ready state.
   */
  int
  megasas_transition_to_ready(struct megasas_instance *instance, int ocr)
  {
  	int i;
  	u8 max_wait;
  	u32 fw_state;
  	u32 cur_state;
  	u32 abs_state, curr_abs_state;
  
  	fw_state = instance->instancet->read_fw_status_reg(instance->reg_set) & MFI_STATE_MASK;
  
  	if (fw_state != MFI_STATE_READY)
  		printk(KERN_INFO "megasas: Waiting for FW to come to ready"
  		       " state\n");
  
  	while (fw_state != MFI_STATE_READY) {
  
  		abs_state =
  		instance->instancet->read_fw_status_reg(instance->reg_set);
  
  		switch (fw_state) {
  
  		case MFI_STATE_FAULT:
  			printk(KERN_DEBUG "megasas: FW in FAULT state!!\n");
  			if (ocr) {
  				max_wait = MEGASAS_RESET_WAIT_TIME;
  				cur_state = MFI_STATE_FAULT;
  				break;
  			} else
  				return -ENODEV;
  
  		case MFI_STATE_WAIT_HANDSHAKE:
  			/*
  			 * Set the CLR bit in inbound doorbell
  			 */
  			if ((instance->pdev->device ==
  				PCI_DEVICE_ID_LSI_SAS0073SKINNY) ||
  				(instance->pdev->device ==
  				 PCI_DEVICE_ID_LSI_SAS0071SKINNY) ||
  				(instance->pdev->device ==
  				 PCI_DEVICE_ID_LSI_FUSION) ||
  				(instance->pdev->device ==
  				PCI_DEVICE_ID_LSI_INVADER)) {
  				writel(
  				  MFI_INIT_CLEAR_HANDSHAKE|MFI_INIT_HOTPLUG,
  				  &instance->reg_set->doorbell);
  			} else {
  				writel(
  				    MFI_INIT_CLEAR_HANDSHAKE|MFI_INIT_HOTPLUG,
  					&instance->reg_set->inbound_doorbell);
  			}
  
  			max_wait = MEGASAS_RESET_WAIT_TIME;
  			cur_state = MFI_STATE_WAIT_HANDSHAKE;
  			break;
  
  		case MFI_STATE_BOOT_MESSAGE_PENDING:
  			if ((instance->pdev->device ==
  			     PCI_DEVICE_ID_LSI_SAS0073SKINNY) ||
  				(instance->pdev->device ==
  				 PCI_DEVICE_ID_LSI_SAS0071SKINNY) ||
  			    (instance->pdev->device ==
  			     PCI_DEVICE_ID_LSI_FUSION) ||
  			    (instance->pdev->device ==
  			     PCI_DEVICE_ID_LSI_INVADER)) {
  				writel(MFI_INIT_HOTPLUG,
  				       &instance->reg_set->doorbell);
  			} else
  				writel(MFI_INIT_HOTPLUG,
  					&instance->reg_set->inbound_doorbell);
  
  			max_wait = MEGASAS_RESET_WAIT_TIME;
  			cur_state = MFI_STATE_BOOT_MESSAGE_PENDING;
  			break;
  
  		case MFI_STATE_OPERATIONAL:
  			/*
  			 * Bring it to READY state; assuming max wait 10 secs
  			 */
  			instance->instancet->disable_intr(instance->reg_set);
  			if ((instance->pdev->device ==
  				PCI_DEVICE_ID_LSI_SAS0073SKINNY) ||
  				(instance->pdev->device ==
  				PCI_DEVICE_ID_LSI_SAS0071SKINNY)  ||
  				(instance->pdev->device
  					== PCI_DEVICE_ID_LSI_FUSION) ||
  				(instance->pdev->device
  					== PCI_DEVICE_ID_LSI_INVADER)) {
  				writel(MFI_RESET_FLAGS,
  					&instance->reg_set->doorbell);
  				if ((instance->pdev->device ==
  				    PCI_DEVICE_ID_LSI_FUSION) ||
  				    (instance->pdev->device ==
  				     PCI_DEVICE_ID_LSI_INVADER)) {
  					for (i = 0; i < (10 * 1000); i += 20) {
  						if (readl(
  							    &instance->
  							    reg_set->
  							    doorbell) & 1)
  							msleep(20);
  						else
  							break;
  					}
  				}
  			} else
  				writel(MFI_RESET_FLAGS,
  					&instance->reg_set->inbound_doorbell);
  
  			max_wait = MEGASAS_RESET_WAIT_TIME;
  			cur_state = MFI_STATE_OPERATIONAL;
  			break;
  
  		case MFI_STATE_UNDEFINED:
  			/*
  			 * This state should not last for more than 2 seconds
  			 */
  			max_wait = MEGASAS_RESET_WAIT_TIME;
  			cur_state = MFI_STATE_UNDEFINED;
  			break;
  
  		case MFI_STATE_BB_INIT:
  			max_wait = MEGASAS_RESET_WAIT_TIME;
  			cur_state = MFI_STATE_BB_INIT;
  			break;
  
  		case MFI_STATE_FW_INIT:
  			max_wait = MEGASAS_RESET_WAIT_TIME;
  			cur_state = MFI_STATE_FW_INIT;
  			break;
  
  		case MFI_STATE_FW_INIT_2:
  			max_wait = MEGASAS_RESET_WAIT_TIME;
  			cur_state = MFI_STATE_FW_INIT_2;
  			break;
  
  		case MFI_STATE_DEVICE_SCAN:
  			max_wait = MEGASAS_RESET_WAIT_TIME;
  			cur_state = MFI_STATE_DEVICE_SCAN;
  			break;
  
  		case MFI_STATE_FLUSH_CACHE:
  			max_wait = MEGASAS_RESET_WAIT_TIME;
  			cur_state = MFI_STATE_FLUSH_CACHE;
  			break;
  
  		default:
  			printk(KERN_DEBUG "megasas: Unknown state 0x%x\n",
  			       fw_state);
  			return -ENODEV;
  		}
  
  		/*
  		 * The cur_state should not last for more than max_wait secs
  		 */
  		for (i = 0; i < (max_wait * 1000); i++) {
  			fw_state = instance->instancet->read_fw_status_reg(instance->reg_set) &
  					MFI_STATE_MASK ;
  		curr_abs_state =
  		instance->instancet->read_fw_status_reg(instance->reg_set);
  
  			if (abs_state == curr_abs_state) {
  				msleep(1);
  			} else
  				break;
  		}
  
  		/*
  		 * Return error if fw_state hasn't changed after max_wait
  		 */
  		if (curr_abs_state == abs_state) {
  			printk(KERN_DEBUG "FW state [%d] hasn't changed "
  			       "in %d secs\n", fw_state, max_wait);
  			return -ENODEV;
  		}
  	}
  	printk(KERN_INFO "megasas: FW now in Ready state\n");
  
  	return 0;
  }
  
  /**
   * megasas_teardown_frame_pool -	Destroy the cmd frame DMA pool
   * @instance:				Adapter soft state
   */
  static void megasas_teardown_frame_pool(struct megasas_instance *instance)
  {
  	int i;
  	u32 max_cmd = instance->max_mfi_cmds;
  	struct megasas_cmd *cmd;
  
  	if (!instance->frame_dma_pool)
  		return;
  
  	/*
  	 * Return all frames to pool
  	 */
  	for (i = 0; i < max_cmd; i++) {
  
  		cmd = instance->cmd_list[i];
  
  		if (cmd->frame)
  			pci_pool_free(instance->frame_dma_pool, cmd->frame,
  				      cmd->frame_phys_addr);
  
  		if (cmd->sense)
  			pci_pool_free(instance->sense_dma_pool, cmd->sense,
  				      cmd->sense_phys_addr);
  	}
  
  	/*
  	 * Now destroy the pool itself
  	 */
  	pci_pool_destroy(instance->frame_dma_pool);
  	pci_pool_destroy(instance->sense_dma_pool);
  
  	instance->frame_dma_pool = NULL;
  	instance->sense_dma_pool = NULL;
  }
  
  /**
   * megasas_create_frame_pool -	Creates DMA pool for cmd frames
   * @instance:			Adapter soft state
   *
   * Each command packet has an embedded DMA memory buffer that is used for
   * filling MFI frame and the SG list that immediately follows the frame. This
   * function creates those DMA memory buffers for each command packet by using
   * PCI pool facility.
   */
  static int megasas_create_frame_pool(struct megasas_instance *instance)
  {
  	int i;
  	u32 max_cmd;
  	u32 sge_sz;
  	u32 sgl_sz;
  	u32 total_sz;
  	u32 frame_count;
  	struct megasas_cmd *cmd;
  
  	max_cmd = instance->max_mfi_cmds;
  
  	/*
  	 * Size of our frame is 64 bytes for MFI frame, followed by max SG
  	 * elements and finally SCSI_SENSE_BUFFERSIZE bytes for sense buffer
  	 */
  	sge_sz = (IS_DMA64) ? sizeof(struct megasas_sge64) :
  	    sizeof(struct megasas_sge32);
  
  	if (instance->flag_ieee) {
  		sge_sz = sizeof(struct megasas_sge_skinny);
  	}
  
  	/*
  	 * Calculated the number of 64byte frames required for SGL
  	 */
  	sgl_sz = sge_sz * instance->max_num_sge;
  	frame_count = (sgl_sz + MEGAMFI_FRAME_SIZE - 1) / MEGAMFI_FRAME_SIZE;
  	frame_count = 15;
  
  	/*
  	 * We need one extra frame for the MFI command
  	 */
  	frame_count++;
  
  	total_sz = MEGAMFI_FRAME_SIZE * frame_count;
  	/*
  	 * Use DMA pool facility provided by PCI layer
  	 */
  	instance->frame_dma_pool = pci_pool_create("megasas frame pool",
  						   instance->pdev, total_sz, 64,
  						   0);
  
  	if (!instance->frame_dma_pool) {
  		printk(KERN_DEBUG "megasas: failed to setup frame pool\n");
  		return -ENOMEM;
  	}
  
  	instance->sense_dma_pool = pci_pool_create("megasas sense pool",
  						   instance->pdev, 128, 4, 0);
  
  	if (!instance->sense_dma_pool) {
  		printk(KERN_DEBUG "megasas: failed to setup sense pool\n");
  
  		pci_pool_destroy(instance->frame_dma_pool);
  		instance->frame_dma_pool = NULL;
  
  		return -ENOMEM;
  	}
  
  	/*
  	 * Allocate and attach a frame to each of the commands in cmd_list.
  	 * By making cmd->index as the context instead of the &cmd, we can
  	 * always use 32bit context regardless of the architecture
  	 */
  	for (i = 0; i < max_cmd; i++) {
  
  		cmd = instance->cmd_list[i];
  
  		cmd->frame = pci_pool_alloc(instance->frame_dma_pool,
  					    GFP_KERNEL, &cmd->frame_phys_addr);
  
  		cmd->sense = pci_pool_alloc(instance->sense_dma_pool,
  					    GFP_KERNEL, &cmd->sense_phys_addr);
  
  		/*
  		 * megasas_teardown_frame_pool() takes care of freeing
  		 * whatever has been allocated
  		 */
  		if (!cmd->frame || !cmd->sense) {
  			printk(KERN_DEBUG "megasas: pci_pool_alloc failed \n");
  			megasas_teardown_frame_pool(instance);
  			return -ENOMEM;
  		}
  
  		memset(cmd->frame, 0, total_sz);
  		cmd->frame->io.context = cmd->index;
  		cmd->frame->io.pad_0 = 0;
  		if ((instance->pdev->device != PCI_DEVICE_ID_LSI_FUSION) &&
  		    (instance->pdev->device != PCI_DEVICE_ID_LSI_INVADER) &&
  		    (reset_devices))
  			cmd->frame->hdr.cmd = MFI_CMD_INVALID;
  	}
  
  	return 0;
  }
  
  /**
   * megasas_free_cmds -	Free all the cmds in the free cmd pool
   * @instance:		Adapter soft state
   */
  void megasas_free_cmds(struct megasas_instance *instance)
  {
  	int i;
  	/* First free the MFI frame pool */
  	megasas_teardown_frame_pool(instance);
  
  	/* Free all the commands in the cmd_list */
  	for (i = 0; i < instance->max_mfi_cmds; i++)
  
  		kfree(instance->cmd_list[i]);
  
  	/* Free the cmd_list buffer itself */
  	kfree(instance->cmd_list);
  	instance->cmd_list = NULL;
  
  	INIT_LIST_HEAD(&instance->cmd_pool);
  }
  
  /**
   * megasas_alloc_cmds -	Allocates the command packets
   * @instance:		Adapter soft state
   *
   * Each command that is issued to the FW, whether IO commands from the OS or
   * internal commands like IOCTLs, are wrapped in local data structure called
   * megasas_cmd. The frame embedded in this megasas_cmd is actually issued to
   * the FW.
   *
   * Each frame has a 32-bit field called context (tag). This context is used
   * to get back the megasas_cmd from the frame when a frame gets completed in
   * the ISR. Typically the address of the megasas_cmd itself would be used as
   * the context. But we wanted to keep the differences between 32 and 64 bit
   * systems to the mininum. We always use 32 bit integers for the context. In
   * this driver, the 32 bit values are the indices into an array cmd_list.
   * This array is used only to look up the megasas_cmd given the context. The
   * free commands themselves are maintained in a linked list called cmd_pool.
   */
  int megasas_alloc_cmds(struct megasas_instance *instance)
  {
  	int i;
  	int j;
  	u32 max_cmd;
  	struct megasas_cmd *cmd;
  
  	max_cmd = instance->max_mfi_cmds;
  
  	/*
  	 * instance->cmd_list is an array of struct megasas_cmd pointers.
  	 * Allocate the dynamic array first and then allocate individual
  	 * commands.
  	 */
  	instance->cmd_list = kcalloc(max_cmd, sizeof(struct megasas_cmd*), GFP_KERNEL);
  
  	if (!instance->cmd_list) {
  		printk(KERN_DEBUG "megasas: out of memory\n");
  		return -ENOMEM;
  	}
  
  	memset(instance->cmd_list, 0, sizeof(struct megasas_cmd *) *max_cmd);
  
  	for (i = 0; i < max_cmd; i++) {
  		instance->cmd_list[i] = kmalloc(sizeof(struct megasas_cmd),
  						GFP_KERNEL);
  
  		if (!instance->cmd_list[i]) {
  
  			for (j = 0; j < i; j++)
  				kfree(instance->cmd_list[j]);
  
  			kfree(instance->cmd_list);
  			instance->cmd_list = NULL;
  
  			return -ENOMEM;
  		}
  	}
  
  	/*
  	 * Add all the commands to command pool (instance->cmd_pool)
  	 */
  	for (i = 0; i < max_cmd; i++) {
  		cmd = instance->cmd_list[i];
  		memset(cmd, 0, sizeof(struct megasas_cmd));
  		cmd->index = i;
  		cmd->scmd = NULL;
  		cmd->instance = instance;
  
  		list_add_tail(&cmd->list, &instance->cmd_pool);
  	}
  
  	/*
  	 * Create a frame pool and assign one frame to each cmd
  	 */
  	if (megasas_create_frame_pool(instance)) {
  		printk(KERN_DEBUG "megasas: Error creating frame DMA pool\n");
  		megasas_free_cmds(instance);
  	}
  
  	return 0;
  }
  
  /*
   * megasas_get_pd_list_info -	Returns FW's pd_list structure
   * @instance:				Adapter soft state
   * @pd_list:				pd_list structure
   *
   * Issues an internal command (DCMD) to get the FW's controller PD
   * list structure.  This information is mainly used to find out SYSTEM
   * supported by the FW.
   */
  static int
  megasas_get_pd_list(struct megasas_instance *instance)
  {
  	int ret = 0, pd_index = 0;
  	struct megasas_cmd *cmd;
  	struct megasas_dcmd_frame *dcmd;
  	struct MR_PD_LIST *ci;
  	struct MR_PD_ADDRESS *pd_addr;
  	dma_addr_t ci_h = 0;
  
  	cmd = megasas_get_cmd(instance);
  
  	if (!cmd) {
  		printk(KERN_DEBUG "megasas (get_pd_list): Failed to get cmd\n");
  		return -ENOMEM;
  	}
  
  	dcmd = &cmd->frame->dcmd;
  
  	ci = pci_alloc_consistent(instance->pdev,
  		  MEGASAS_MAX_PD * sizeof(struct MR_PD_LIST), &ci_h);
  
  	if (!ci) {
  		printk(KERN_DEBUG "Failed to alloc mem for pd_list\n");
  		megasas_return_cmd(instance, cmd);
  		return -ENOMEM;
  	}
  
  	memset(ci, 0, sizeof(*ci));
  	memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);
  
  	dcmd->mbox.b[0] = MR_PD_QUERY_TYPE_EXPOSED_TO_HOST;
  	dcmd->mbox.b[1] = 0;
  	dcmd->cmd = MFI_CMD_DCMD;
  	dcmd->cmd_status = 0xFF;
  	dcmd->sge_count = 1;
  	dcmd->flags = MFI_FRAME_DIR_READ;
  	dcmd->timeout = 0;
  	dcmd->pad_0 = 0;
  	dcmd->data_xfer_len = MEGASAS_MAX_PD * sizeof(struct MR_PD_LIST);
  	dcmd->opcode = MR_DCMD_PD_LIST_QUERY;
  	dcmd->sgl.sge32[0].phys_addr = ci_h;
  	dcmd->sgl.sge32[0].length = MEGASAS_MAX_PD * sizeof(struct MR_PD_LIST);
  
  	if (!megasas_issue_polled(instance, cmd)) {
  		ret = 0;
  	} else {
  		ret = -1;
  	}
  
  	/*
  	* the following function will get the instance PD LIST.
  	*/
  
  	pd_addr = ci->addr;
  
  	if ( ret == 0 &&
  		(ci->count <
  		  (MEGASAS_MAX_PD_CHANNELS * MEGASAS_MAX_DEV_PER_CHANNEL))) {
  
  		memset(instance->pd_list, 0,
  			MEGASAS_MAX_PD * sizeof(struct megasas_pd_list));
  
  		for (pd_index = 0; pd_index < ci->count; pd_index++) {
  
  			instance->pd_list[pd_addr->deviceId].tid	=
  							pd_addr->deviceId;
  			instance->pd_list[pd_addr->deviceId].driveType	=
  							pd_addr->scsiDevType;
  			instance->pd_list[pd_addr->deviceId].driveState	=
  							MR_PD_STATE_SYSTEM;
  			pd_addr++;
  		}
  	}
  
  	pci_free_consistent(instance->pdev,
  				MEGASAS_MAX_PD * sizeof(struct MR_PD_LIST),
  				ci, ci_h);
  	megasas_return_cmd(instance, cmd);
  
  	return ret;
  }
  
  /*
   * megasas_get_ld_list_info -	Returns FW's ld_list structure
   * @instance:				Adapter soft state
   * @ld_list:				ld_list structure
   *
   * Issues an internal command (DCMD) to get the FW's controller PD
   * list structure.  This information is mainly used to find out SYSTEM
   * supported by the FW.
   */
  static int
  megasas_get_ld_list(struct megasas_instance *instance)
  {
  	int ret = 0, ld_index = 0, ids = 0;
  	struct megasas_cmd *cmd;
  	struct megasas_dcmd_frame *dcmd;
  	struct MR_LD_LIST *ci;
  	dma_addr_t ci_h = 0;
  
  	cmd = megasas_get_cmd(instance);
  
  	if (!cmd) {
  		printk(KERN_DEBUG "megasas_get_ld_list: Failed to get cmd\n");
  		return -ENOMEM;
  	}
  
  	dcmd = &cmd->frame->dcmd;
  
  	ci = pci_alloc_consistent(instance->pdev,
  				sizeof(struct MR_LD_LIST),
  				&ci_h);
  
  	if (!ci) {
  		printk(KERN_DEBUG "Failed to alloc mem in get_ld_list\n");
  		megasas_return_cmd(instance, cmd);
  		return -ENOMEM;
  	}
  
  	memset(ci, 0, sizeof(*ci));
  	memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);
  
  	dcmd->cmd = MFI_CMD_DCMD;
  	dcmd->cmd_status = 0xFF;
  	dcmd->sge_count = 1;
  	dcmd->flags = MFI_FRAME_DIR_READ;
  	dcmd->timeout = 0;
  	dcmd->data_xfer_len = sizeof(struct MR_LD_LIST);
  	dcmd->opcode = MR_DCMD_LD_GET_LIST;
  	dcmd->sgl.sge32[0].phys_addr = ci_h;
  	dcmd->sgl.sge32[0].length = sizeof(struct MR_LD_LIST);
  	dcmd->pad_0  = 0;
  
  	if (!megasas_issue_polled(instance, cmd)) {
  		ret = 0;
  	} else {
  		ret = -1;
  	}
  
  	/* the following function will get the instance PD LIST */
  
  	if ((ret == 0) && (ci->ldCount <= MAX_LOGICAL_DRIVES)) {
  		memset(instance->ld_ids, 0xff, MEGASAS_MAX_LD_IDS);
  
  		for (ld_index = 0; ld_index < ci->ldCount; ld_index++) {
  			if (ci->ldList[ld_index].state != 0) {
  				ids = ci->ldList[ld_index].ref.targetId;
  				instance->ld_ids[ids] =
  					ci->ldList[ld_index].ref.targetId;
  			}
  		}
  	}
  
  	pci_free_consistent(instance->pdev,
  				sizeof(struct MR_LD_LIST),
  				ci,
  				ci_h);
  
  	megasas_return_cmd(instance, cmd);
  	return ret;
  }
  
  /**
   * megasas_get_controller_info -	Returns FW's controller structure
   * @instance:				Adapter soft state
   * @ctrl_info:				Controller information structure
   *
   * Issues an internal command (DCMD) to get the FW's controller structure.
   * This information is mainly used to find out the maximum IO transfer per
   * command supported by the FW.
   */
  static int
  megasas_get_ctrl_info(struct megasas_instance *instance,
  		      struct megasas_ctrl_info *ctrl_info)
  {
  	int ret = 0;
  	struct megasas_cmd *cmd;
  	struct megasas_dcmd_frame *dcmd;
  	struct megasas_ctrl_info *ci;
  	dma_addr_t ci_h = 0;
  
  	cmd = megasas_get_cmd(instance);
  
  	if (!cmd) {
  		printk(KERN_DEBUG "megasas: Failed to get a free cmd\n");
  		return -ENOMEM;
  	}
  
  	dcmd = &cmd->frame->dcmd;
  
  	ci = pci_alloc_consistent(instance->pdev,
  				  sizeof(struct megasas_ctrl_info), &ci_h);
  
  	if (!ci) {
  		printk(KERN_DEBUG "Failed to alloc mem for ctrl info\n");
  		megasas_return_cmd(instance, cmd);
  		return -ENOMEM;
  	}
  
  	memset(ci, 0, sizeof(*ci));
  	memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);
  
  	dcmd->cmd = MFI_CMD_DCMD;
  	dcmd->cmd_status = 0xFF;
  	dcmd->sge_count = 1;
  	dcmd->flags = MFI_FRAME_DIR_READ;
  	dcmd->timeout = 0;
  	dcmd->pad_0 = 0;
  	dcmd->data_xfer_len = sizeof(struct megasas_ctrl_info);
  	dcmd->opcode = MR_DCMD_CTRL_GET_INFO;
  	dcmd->sgl.sge32[0].phys_addr = ci_h;
  	dcmd->sgl.sge32[0].length = sizeof(struct megasas_ctrl_info);
  
  	if (!megasas_issue_polled(instance, cmd)) {
  		ret = 0;
  		memcpy(ctrl_info, ci, sizeof(struct megasas_ctrl_info));
  	} else {
  		ret = -1;
  	}
  
  	pci_free_consistent(instance->pdev, sizeof(struct megasas_ctrl_info),
  			    ci, ci_h);
  
  	megasas_return_cmd(instance, cmd);
  	return ret;
  }
  
  /**
   * megasas_issue_init_mfi -	Initializes the FW
   * @instance:		Adapter soft state
   *
   * Issues the INIT MFI cmd
   */
  static int
  megasas_issue_init_mfi(struct megasas_instance *instance)
  {
  	u32 context;
  
  	struct megasas_cmd *cmd;
  
  	struct megasas_init_frame *init_frame;
  	struct megasas_init_queue_info *initq_info;
  	dma_addr_t init_frame_h;
  	dma_addr_t initq_info_h;
  
  	/*
  	 * Prepare a init frame. Note the init frame points to queue info
  	 * structure. Each frame has SGL allocated after first 64 bytes. For
  	 * this frame - since we don't need any SGL - we use SGL's space as
  	 * queue info structure
  	 *
  	 * We will not get a NULL command below. We just created the pool.
  	 */
  	cmd = megasas_get_cmd(instance);
  
  	init_frame = (struct megasas_init_frame *)cmd->frame;
  	initq_info = (struct megasas_init_queue_info *)
  		((unsigned long)init_frame + 64);
  
  	init_frame_h = cmd->frame_phys_addr;
  	initq_info_h = init_frame_h + 64;
  
  	context = init_frame->context;
  	memset(init_frame, 0, MEGAMFI_FRAME_SIZE);
  	memset(initq_info, 0, sizeof(struct megasas_init_queue_info));
  	init_frame->context = context;
  
  	initq_info->reply_queue_entries = instance->max_fw_cmds + 1;
  	initq_info->reply_queue_start_phys_addr_lo = instance->reply_queue_h;
  
  	initq_info->producer_index_phys_addr_lo = instance->producer_h;
  	initq_info->consumer_index_phys_addr_lo = instance->consumer_h;
  
  	init_frame->cmd = MFI_CMD_INIT;
  	init_frame->cmd_status = 0xFF;
  	init_frame->queue_info_new_phys_addr_lo = initq_info_h;
  
  	init_frame->data_xfer_len = sizeof(struct megasas_init_queue_info);
  
  	/*
  	 * disable the intr before firing the init frame to FW
  	 */
  	instance->instancet->disable_intr(instance->reg_set);
  
  	/*
  	 * Issue the init frame in polled mode
  	 */
  
  	if (megasas_issue_polled(instance, cmd)) {
  		printk(KERN_ERR "megasas: Failed to init firmware\n");
  		megasas_return_cmd(instance, cmd);
  		goto fail_fw_init;
  	}
  
  	megasas_return_cmd(instance, cmd);
  
  	return 0;
  
  fail_fw_init:
  	return -EINVAL;
  }
  
  static u32
  megasas_init_adapter_mfi(struct megasas_instance *instance)
  {
  	struct megasas_register_set __iomem *reg_set;
  	u32 context_sz;
  	u32 reply_q_sz;
  
  	reg_set = instance->reg_set;
  
  	/*
  	 * Get various operational parameters from status register
  	 */
  	instance->max_fw_cmds = instance->instancet->read_fw_status_reg(reg_set) & 0x00FFFF;
  	/*
  	 * Reduce the max supported cmds by 1. This is to ensure that the
  	 * reply_q_sz (1 more than the max cmd that driver may send)
  	 * does not exceed max cmds that the FW can support
  	 */
  	instance->max_fw_cmds = instance->max_fw_cmds-1;
  	instance->max_mfi_cmds = instance->max_fw_cmds;
  	instance->max_num_sge = (instance->instancet->read_fw_status_reg(reg_set) & 0xFF0000) >>
  					0x10;
  	/*
  	 * Create a pool of commands
  	 */
  	if (megasas_alloc_cmds(instance))
  		goto fail_alloc_cmds;
  
  	/*
  	 * Allocate memory for reply queue. Length of reply queue should
  	 * be _one_ more than the maximum commands handled by the firmware.
  	 *
  	 * Note: When FW completes commands, it places corresponding contex
  	 * values in this circular reply queue. This circular queue is a fairly
  	 * typical producer-consumer queue. FW is the producer (of completed
  	 * commands) and the driver is the consumer.
  	 */
  	context_sz = sizeof(u32);
  	reply_q_sz = context_sz * (instance->max_fw_cmds + 1);
  
  	instance->reply_queue = pci_alloc_consistent(instance->pdev,
  						     reply_q_sz,
  						     &instance->reply_queue_h);
  
  	if (!instance->reply_queue) {
  		printk(KERN_DEBUG "megasas: Out of DMA mem for reply queue\n");
  		goto fail_reply_queue;
  	}
  
  	if (megasas_issue_init_mfi(instance))
  		goto fail_fw_init;
  
  	instance->fw_support_ieee = 0;
  	instance->fw_support_ieee =
  		(instance->instancet->read_fw_status_reg(reg_set) &
  		0x04000000);
  
  	printk(KERN_NOTICE "megasas_init_mfi: fw_support_ieee=%d",
  			instance->fw_support_ieee);
  
  	if (instance->fw_support_ieee)
  		instance->flag_ieee = 1;
  
  	return 0;
  
  fail_fw_init:
  
  	pci_free_consistent(instance->pdev, reply_q_sz,
  			    instance->reply_queue, instance->reply_queue_h);
  fail_reply_queue:
  	megasas_free_cmds(instance);
  
  fail_alloc_cmds:
  	return 1;
  }
  
  /**
   * megasas_init_fw -	Initializes the FW
   * @instance:		Adapter soft state
   *
   * This is the main function for initializing firmware
   */
  
  static int megasas_init_fw(struct megasas_instance *instance)
  {
  	u32 max_sectors_1;
  	u32 max_sectors_2;
  	u32 tmp_sectors, msix_enable;
  	resource_size_t base_addr;
  	struct megasas_register_set __iomem *reg_set;
  	struct megasas_ctrl_info *ctrl_info;
  	unsigned long bar_list;
  	int i;
  
  	/* Find first memory bar */
  	bar_list = pci_select_bars(instance->pdev, IORESOURCE_MEM);
  	instance->bar = find_first_bit(&bar_list, sizeof(unsigned long));
  	if (pci_request_selected_regions(instance->pdev, 1<<instance->bar,
  					 "megasas: LSI")) {
  		printk(KERN_DEBUG "megasas: IO memory region busy!\n");
  		return -EBUSY;
  	}
  
  	base_addr = pci_resource_start(instance->pdev, instance->bar);
  	instance->reg_set = ioremap_nocache(base_addr, 8192);
  
  	if (!instance->reg_set) {
  		printk(KERN_DEBUG "megasas: Failed to map IO mem\n");
  		goto fail_ioremap;
  	}
  
  	reg_set = instance->reg_set;
  
  	switch (instance->pdev->device) {
  	case PCI_DEVICE_ID_LSI_FUSION:
  	case PCI_DEVICE_ID_LSI_INVADER:
  		instance->instancet = &megasas_instance_template_fusion;
  		break;
  	case PCI_DEVICE_ID_LSI_SAS1078R:
  	case PCI_DEVICE_ID_LSI_SAS1078DE:
  		instance->instancet = &megasas_instance_template_ppc;
  		break;
  	case PCI_DEVICE_ID_LSI_SAS1078GEN2:
  	case PCI_DEVICE_ID_LSI_SAS0079GEN2:
  		instance->instancet = &megasas_instance_template_gen2;
  		break;
  	case PCI_DEVICE_ID_LSI_SAS0073SKINNY:
  	case PCI_DEVICE_ID_LSI_SAS0071SKINNY:
  		instance->instancet = &megasas_instance_template_skinny;
  		break;
  	case PCI_DEVICE_ID_LSI_SAS1064R:
  	case PCI_DEVICE_ID_DELL_PERC5:
  	default:
  		instance->instancet = &megasas_instance_template_xscale;
  		break;
  	}
  
  	if (megasas_transition_to_ready(instance, 0)) {
  		atomic_set(&instance->fw_reset_no_pci_access, 1);
  		instance->instancet->adp_reset
  			(instance, instance->reg_set);
  		atomic_set(&instance->fw_reset_no_pci_access, 0);
  		dev_info(&instance->pdev->dev,
  			"megasas: FW restarted successfully from %s!\n",
  			__func__);
  
  		/*waitting for about 30 second before retry*/
  		ssleep(30);
  
  		if (megasas_transition_to_ready(instance, 0))
  			goto fail_ready_state;
  	}
  
  	/* Check if MSI-X is supported while in ready state */
  	msix_enable = (instance->instancet->read_fw_status_reg(reg_set) &
  		       0x4000000) >> 0x1a;
  	if (msix_enable && !msix_disable) {
  		/* Check max MSI-X vectors */
  		if ((instance->pdev->device == PCI_DEVICE_ID_LSI_FUSION) ||
  		    (instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER)) {
  			instance->msix_vectors = (readl(&instance->reg_set->
  							outbound_scratch_pad_2
  							  ) & 0x1F) + 1;
  			if (msix_vectors)
  				instance->msix_vectors =
  					min(msix_vectors,
  					    instance->msix_vectors);
  		} else
  			instance->msix_vectors = 1;
  		/* Don't bother allocating more MSI-X vectors than cpus */
  		instance->msix_vectors = min(instance->msix_vectors,
  					     (unsigned int)num_online_cpus());
  		for (i = 0; i < instance->msix_vectors; i++)
  			instance->msixentry[i].entry = i;
  		i = pci_enable_msix(instance->pdev, instance->msixentry,
  				    instance->msix_vectors);
  		if (i >= 0) {
  			if (i) {
  				if (!pci_enable_msix(instance->pdev,
  						     instance->msixentry, i))
  					instance->msix_vectors = i;
  				else
  					instance->msix_vectors = 0;
  			}
  		} else
  			instance->msix_vectors = 0;
  	}
  
  	/* Get operational params, sge flags, send init cmd to controller */
  	if (instance->instancet->init_adapter(instance))
  		goto fail_init_adapter;
  
  	printk(KERN_ERR "megasas: INIT adapter done\n");
  
  	/** for passthrough
  	* the following function will get the PD LIST.
  	*/
  
  	memset(instance->pd_list, 0 ,
  		(MEGASAS_MAX_PD * sizeof(struct megasas_pd_list)));
  	megasas_get_pd_list(instance);
  
  	memset(instance->ld_ids, 0xff, MEGASAS_MAX_LD_IDS);
  	megasas_get_ld_list(instance);
  
  	ctrl_info = kmalloc(sizeof(struct megasas_ctrl_info), GFP_KERNEL);
  
  	/*
  	 * Compute the max allowed sectors per IO: The controller info has two
  	 * limits on max sectors. Driver should use the minimum of these two.
  	 *
  	 * 1 << stripe_sz_ops.min = max sectors per strip
  	 *
  	 * Note that older firmwares ( < FW ver 30) didn't report information
  	 * to calculate max_sectors_1. So the number ended up as zero always.
  	 */
  	tmp_sectors = 0;
  	if (ctrl_info && !megasas_get_ctrl_info(instance, ctrl_info)) {
  
  		max_sectors_1 = (1 << ctrl_info->stripe_sz_ops.min) *
  		    ctrl_info->max_strips_per_io;
  		max_sectors_2 = ctrl_info->max_request_size;
  
  		tmp_sectors = min_t(u32, max_sectors_1 , max_sectors_2);
  		instance->disableOnlineCtrlReset =
  		ctrl_info->properties.OnOffProperties.disableOnlineCtrlReset;
  	}
  
  	instance->max_sectors_per_req = instance->max_num_sge *
  						SGE_BUFFER_SIZE / 512;
  	if (tmp_sectors && (instance->max_sectors_per_req > tmp_sectors))
  		instance->max_sectors_per_req = tmp_sectors;
  
  	kfree(ctrl_info);
  
  	/* Check for valid throttlequeuedepth module parameter */
  	if (instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0073SKINNY ||
  	    instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0071SKINNY) {
  		if (throttlequeuedepth > (instance->max_fw_cmds -
  					  MEGASAS_SKINNY_INT_CMDS))
  			instance->throttlequeuedepth =
  				MEGASAS_THROTTLE_QUEUE_DEPTH;
  		else
  			instance->throttlequeuedepth = throttlequeuedepth;
  	} else {
  		if (throttlequeuedepth > (instance->max_fw_cmds -
  					  MEGASAS_INT_CMDS))
  			instance->throttlequeuedepth =
  				MEGASAS_THROTTLE_QUEUE_DEPTH;
  		else
  			instance->throttlequeuedepth = throttlequeuedepth;
  	}
  
          /*
  	* Setup tasklet for cmd completion
  	*/
  
  	tasklet_init(&instance->isr_tasklet, instance->instancet->tasklet,
  		(unsigned long)instance);
  
  	return 0;
  
  fail_init_adapter:
  fail_ready_state:
  	iounmap(instance->reg_set);
  
        fail_ioremap:
  	pci_release_selected_regions(instance->pdev, 1<<instance->bar);
  
  	return -EINVAL;
  }
  
  /**
   * megasas_release_mfi -	Reverses the FW initialization
   * @intance:			Adapter soft state
   */
  static void megasas_release_mfi(struct megasas_instance *instance)
  {
  	u32 reply_q_sz = sizeof(u32) *(instance->max_mfi_cmds + 1);
  
  	if (instance->reply_queue)
  		pci_free_consistent(instance->pdev, reply_q_sz,
  			    instance->reply_queue, instance->reply_queue_h);
  
  	megasas_free_cmds(instance);
  
  	iounmap(instance->reg_set);
  
  	pci_release_selected_regions(instance->pdev, 1<<instance->bar);
  }
  
  /**
   * megasas_get_seq_num -	Gets latest event sequence numbers
   * @instance:			Adapter soft state
   * @eli:			FW event log sequence numbers information
   *
   * FW maintains a log of all events in a non-volatile area. Upper layers would
   * usually find out the latest sequence number of the events, the seq number at
   * the boot etc. They would "read" all the events below the latest seq number
   * by issuing a direct fw cmd (DCMD). For the future events (beyond latest seq
   * number), they would subsribe to AEN (asynchronous event notification) and
   * wait for the events to happen.
   */
  static int
  megasas_get_seq_num(struct megasas_instance *instance,
  		    struct megasas_evt_log_info *eli)
  {
  	struct megasas_cmd *cmd;
  	struct megasas_dcmd_frame *dcmd;
  	struct megasas_evt_log_info *el_info;
  	dma_addr_t el_info_h = 0;
  
  	cmd = megasas_get_cmd(instance);
  
  	if (!cmd) {
  		return -ENOMEM;
  	}
  
  	dcmd = &cmd->frame->dcmd;
  	el_info = pci_alloc_consistent(instance->pdev,
  				       sizeof(struct megasas_evt_log_info),
  				       &el_info_h);
  
  	if (!el_info) {
  		megasas_return_cmd(instance, cmd);
  		return -ENOMEM;
  	}
  
  	memset(el_info, 0, sizeof(*el_info));
  	memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);
  
  	dcmd->cmd = MFI_CMD_DCMD;
  	dcmd->cmd_status = 0x0;
  	dcmd->sge_count = 1;
  	dcmd->flags = MFI_FRAME_DIR_READ;
  	dcmd->timeout = 0;
  	dcmd->pad_0 = 0;
  	dcmd->data_xfer_len = sizeof(struct megasas_evt_log_info);
  	dcmd->opcode = MR_DCMD_CTRL_EVENT_GET_INFO;
  	dcmd->sgl.sge32[0].phys_addr = el_info_h;
  	dcmd->sgl.sge32[0].length = sizeof(struct megasas_evt_log_info);
  
  	megasas_issue_blocked_cmd(instance, cmd);
  
  	/*
  	 * Copy the data back into callers buffer
  	 */
  	memcpy(eli, el_info, sizeof(struct megasas_evt_log_info));
  
  	pci_free_consistent(instance->pdev, sizeof(struct megasas_evt_log_info),
  			    el_info, el_info_h);
  
  	megasas_return_cmd(instance, cmd);
  
  	return 0;
  }
  
  /**
   * megasas_register_aen -	Registers for asynchronous event notification
   * @instance:			Adapter soft state
   * @seq_num:			The starting sequence number
   * @class_locale:		Class of the event
   *
   * This function subscribes for AEN for events beyond the @seq_num. It requests
   * to be notified if and only if the event is of type @class_locale
   */
  static int
  megasas_register_aen(struct megasas_instance *instance, u32 seq_num,
  		     u32 class_locale_word)
  {
  	int ret_val;
  	struct megasas_cmd *cmd;
  	struct megasas_dcmd_frame *dcmd;
  	union megasas_evt_class_locale curr_aen;
  	union megasas_evt_class_locale prev_aen;
  
  	/*
  	 * If there an AEN pending already (aen_cmd), check if the
  	 * class_locale of that pending AEN is inclusive of the new
  	 * AEN request we currently have. If it is, then we don't have
  	 * to do anything. In other words, whichever events the current
  	 * AEN request is subscribing to, have already been subscribed
  	 * to.
  	 *
  	 * If the old_cmd is _not_ inclusive, then we have to abort
  	 * that command, form a class_locale that is superset of both
  	 * old and current and re-issue to the FW
  	 */
  
  	curr_aen.word = class_locale_word;
  
  	if (instance->aen_cmd) {
  
  		prev_aen.word = instance->aen_cmd->frame->dcmd.mbox.w[1];
  
  		/*
  		 * A class whose enum value is smaller is inclusive of all
  		 * higher values. If a PROGRESS (= -1) was previously
  		 * registered, then a new registration requests for higher
  		 * classes need not be sent to FW. They are automatically
  		 * included.
  		 *
  		 * Locale numbers don't have such hierarchy. They are bitmap
  		 * values
  		 */
  		if ((prev_aen.members.class <= curr_aen.members.class) &&
  		    !((prev_aen.members.locale & curr_aen.members.locale) ^
  		      curr_aen.members.locale)) {
  			/*
  			 * Previously issued event registration includes
  			 * current request. Nothing to do.
  			 */
  			return 0;
  		} else {
  			curr_aen.members.locale |= prev_aen.members.locale;
  
  			if (prev_aen.members.class < curr_aen.members.class)
  				curr_aen.members.class = prev_aen.members.class;
  
  			instance->aen_cmd->abort_aen = 1;
  			ret_val = megasas_issue_blocked_abort_cmd(instance,
  								  instance->
  								  aen_cmd);
  
  			if (ret_val) {
  				printk(KERN_DEBUG "megasas: Failed to abort "
  				       "previous AEN command\n");
  				return ret_val;
  			}
  		}
  	}
  
  	cmd = megasas_get_cmd(instance);
  
  	if (!cmd)
  		return -ENOMEM;
  
  	dcmd = &cmd->frame->dcmd;
  
  	memset(instance->evt_detail, 0, sizeof(struct megasas_evt_detail));
  
  	/*
  	 * Prepare DCMD for aen registration
  	 */
  	memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);
  
  	dcmd->cmd = MFI_CMD_DCMD;
  	dcmd->cmd_status = 0x0;
  	dcmd->sge_count = 1;
  	dcmd->flags = MFI_FRAME_DIR_READ;
  	dcmd->timeout = 0;
  	dcmd->pad_0 = 0;
  	instance->last_seq_num = seq_num;
  	dcmd->data_xfer_len = sizeof(struct megasas_evt_detail);
  	dcmd->opcode = MR_DCMD_CTRL_EVENT_WAIT;
  	dcmd->mbox.w[0] = seq_num;
  	dcmd->mbox.w[1] = curr_aen.word;
  	dcmd->sgl.sge32[0].phys_addr = (u32) instance->evt_detail_h;
  	dcmd->sgl.sge32[0].length = sizeof(struct megasas_evt_detail);
  
  	if (instance->aen_cmd != NULL) {
  		megasas_return_cmd(instance, cmd);
  		return 0;
  	}
  
  	/*
  	 * Store reference to the cmd used to register for AEN. When an
  	 * application wants us to register for AEN, we have to abort this
  	 * cmd and re-register with a new EVENT LOCALE supplied by that app
  	 */
  	instance->aen_cmd = cmd;
  
  	/*
  	 * Issue the aen registration frame
  	 */
  	instance->instancet->issue_dcmd(instance, cmd);
  
  	return 0;
  }
  
  /**
   * megasas_start_aen -	Subscribes to AEN during driver load time
   * @instance:		Adapter soft state
   */
  static int megasas_start_aen(struct megasas_instance *instance)
  {
  	struct megasas_evt_log_info eli;
  	union megasas_evt_class_locale class_locale;
  
  	/*
  	 * Get the latest sequence number from FW
  	 */
  	memset(&eli, 0, sizeof(eli));
  
  	if (megasas_get_seq_num(instance, &eli))
  		return -1;
  
  	/*
  	 * Register AEN with FW for latest sequence number plus 1
  	 */
  	class_locale.members.reserved = 0;
  	class_locale.members.locale = MR_EVT_LOCALE_ALL;
  	class_locale.members.class = MR_EVT_CLASS_DEBUG;
  
  	return megasas_register_aen(instance, eli.newest_seq_num + 1,
  				    class_locale.word);
  }
  
  /**
   * megasas_io_attach -	Attaches this driver to SCSI mid-layer
   * @instance:		Adapter soft state
   */
  static int megasas_io_attach(struct megasas_instance *instance)
  {
  	struct Scsi_Host *host = instance->host;
  
  	/*
  	 * Export parameters required by SCSI mid-layer
  	 */
  	host->irq = instance->pdev->irq;
  	host->unique_id = instance->unique_id;
  	if ((instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0073SKINNY) ||
  		(instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0071SKINNY)) {
  		host->can_queue =
  			instance->max_fw_cmds - MEGASAS_SKINNY_INT_CMDS;
  	} else
  		host->can_queue =
  			instance->max_fw_cmds - MEGASAS_INT_CMDS;
  	host->this_id = instance->init_id;
  	host->sg_tablesize = instance->max_num_sge;
  
  	if (instance->fw_support_ieee)
  		instance->max_sectors_per_req = MEGASAS_MAX_SECTORS_IEEE;
  
  	/*
  	 * Check if the module parameter value for max_sectors can be used
  	 */
  	if (max_sectors && max_sectors < instance->max_sectors_per_req)
  		instance->max_sectors_per_req = max_sectors;
  	else {
  		if (max_sectors) {
  			if (((instance->pdev->device ==
  				PCI_DEVICE_ID_LSI_SAS1078GEN2) ||
  				(instance->pdev->device ==
  				PCI_DEVICE_ID_LSI_SAS0079GEN2)) &&
  				(max_sectors <= MEGASAS_MAX_SECTORS)) {
  				instance->max_sectors_per_req = max_sectors;
  			} else {
  			printk(KERN_INFO "megasas: max_sectors should be > 0"
  				"and <= %d (or < 1MB for GEN2 controller)\n",
  				instance->max_sectors_per_req);
  			}
  		}
  	}
  
  	host->max_sectors = instance->max_sectors_per_req;
  	host->cmd_per_lun = MEGASAS_DEFAULT_CMD_PER_LUN;
  	host->max_channel = MEGASAS_MAX_CHANNELS - 1;
  	host->max_id = MEGASAS_MAX_DEV_PER_CHANNEL;
  	host->max_lun = MEGASAS_MAX_LUN;
  	host->max_cmd_len = 16;
  
  	/* Fusion only supports host reset */
  	if ((instance->pdev->device == PCI_DEVICE_ID_LSI_FUSION) ||
  	    (instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER)) {
  		host->hostt->eh_device_reset_handler = NULL;
  		host->hostt->eh_bus_reset_handler = NULL;
  	}
  
  	/*
  	 * Notify the mid-layer about the new controller
  	 */
  	if (scsi_add_host(host, &instance->pdev->dev)) {
  		printk(KERN_DEBUG "megasas: scsi_add_host failed\n");
  		return -ENODEV;
  	}
  
  	/*
  	 * Trigger SCSI to scan our drives
  	 */
  	scsi_scan_host(host);
  	return 0;
  }
  
  static int
  megasas_set_dma_mask(struct pci_dev *pdev)
  {
  	/*
  	 * All our contollers are capable of performing 64-bit DMA
  	 */
  	if (IS_DMA64) {
  		if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) != 0) {
  
  			if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) != 0)
  				goto fail_set_dma_mask;
  		}
  	} else {
  		if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) != 0)
  			goto fail_set_dma_mask;
  	}
  	return 0;
  
  fail_set_dma_mask:
  	return 1;
  }
  
  /**
   * megasas_probe_one -	PCI hotplug entry point
   * @pdev:		PCI device structure
   * @id:			PCI ids of supported hotplugged adapter
   */
  static int megasas_probe_one(struct pci_dev *pdev,
  			     const struct pci_device_id *id)
  {
  	int rval, pos, i, j;
  	struct Scsi_Host *host;
  	struct megasas_instance *instance;
  	u16 control = 0;
  
  	/* Reset MSI-X in the kdump kernel */
  	if (reset_devices) {
  		pos = pci_find_capability(pdev, PCI_CAP_ID_MSIX);
  		if (pos) {
  			pci_read_config_word(pdev, pos + PCI_MSIX_FLAGS,
  					     &control);
  			if (control & PCI_MSIX_FLAGS_ENABLE) {
  				dev_info(&pdev->dev, "resetting MSI-X\n");
  				pci_write_config_word(pdev,
  						      pos + PCI_MSIX_FLAGS,
  						      control &
  						      ~PCI_MSIX_FLAGS_ENABLE);
  			}
  		}
  	}
  
  	/*
  	 * Announce PCI information
  	 */
  	printk(KERN_INFO "megasas: %#4.04x:%#4.04x:%#4.04x:%#4.04x: ",
  	       pdev->vendor, pdev->device, pdev->subsystem_vendor,
  	       pdev->subsystem_device);
  
  	printk("bus %d:slot %d:func %d\n",
  	       pdev->bus->number, PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
  
  	/*
  	 * PCI prepping: enable device set bus mastering and dma mask
  	 */
  	rval = pci_enable_device_mem(pdev);
  
  	if (rval) {
  		return rval;
  	}
  
  	pci_set_master(pdev);
  
  	if (megasas_set_dma_mask(pdev))
  		goto fail_set_dma_mask;
  
  	host = scsi_host_alloc(&megasas_template,
  			       sizeof(struct megasas_instance));
  
  	if (!host) {
  		printk(KERN_DEBUG "megasas: scsi_host_alloc failed\n");
  		goto fail_alloc_instance;
  	}
  
  	instance = (struct megasas_instance *)host->hostdata;
  	memset(instance, 0, sizeof(*instance));
  	atomic_set( &instance->fw_reset_no_pci_access, 0 );
  	instance->pdev = pdev;
  
  	switch (instance->pdev->device) {
  	case PCI_DEVICE_ID_LSI_FUSION:
  	case PCI_DEVICE_ID_LSI_INVADER:
  	{
  		struct fusion_context *fusion;
  
  		instance->ctrl_context =
  			kzalloc(sizeof(struct fusion_context), GFP_KERNEL);
  		if (!instance->ctrl_context) {
  			printk(KERN_DEBUG "megasas: Failed to allocate "
  			       "memory for Fusion context info\n");
  			goto fail_alloc_dma_buf;
  		}
  		fusion = instance->ctrl_context;
  		INIT_LIST_HEAD(&fusion->cmd_pool);
  		spin_lock_init(&fusion->cmd_pool_lock);
  	}
  	break;
  	default: /* For all other supported controllers */
  
  		instance->producer =
  			pci_alloc_consistent(pdev, sizeof(u32),
  					     &instance->producer_h);
  		instance->consumer =
  			pci_alloc_consistent(pdev, sizeof(u32),
  					     &instance->consumer_h);
  
  		if (!instance->producer || !instance->consumer) {
  			printk(KERN_DEBUG "megasas: Failed to allocate"
  			       "memory for producer, consumer\n");
  			goto fail_alloc_dma_buf;
  		}
  
  		*instance->producer = 0;
  		*instance->consumer = 0;
  		break;
  	}
  
  	megasas_poll_wait_aen = 0;
  	instance->flag_ieee = 0;
  	instance->ev = NULL;
  	instance->issuepend_done = 1;
  	instance->adprecovery = MEGASAS_HBA_OPERATIONAL;
  	megasas_poll_wait_aen = 0;
  
  	instance->evt_detail = pci_alloc_consistent(pdev,
  						    sizeof(struct
  							   megasas_evt_detail),
  						    &instance->evt_detail_h);
  
  	if (!instance->evt_detail) {
  		printk(KERN_DEBUG "megasas: Failed to allocate memory for "
  		       "event detail structure\n");
  		goto fail_alloc_dma_buf;
  	}
  
  	/*
  	 * Initialize locks and queues
  	 */
  	INIT_LIST_HEAD(&instance->cmd_pool);
  	INIT_LIST_HEAD(&instance->internal_reset_pending_q);
  
  	atomic_set(&instance->fw_outstanding,0);
  
  	init_waitqueue_head(&instance->int_cmd_wait_q);
  	init_waitqueue_head(&instance->abort_cmd_wait_q);
  
  	spin_lock_init(&instance->cmd_pool_lock);
  	spin_lock_init(&instance->hba_lock);
  	spin_lock_init(&instance->completion_lock);
  
  	mutex_init(&instance->aen_mutex);
  	mutex_init(&instance->reset_mutex);
  
  	/*
  	 * Initialize PCI related and misc parameters
  	 */
  	instance->host = host;
  	instance->unique_id = pdev->bus->number << 8 | pdev->devfn;
  	instance->init_id = MEGASAS_DEFAULT_INIT_ID;
  
  	if ((instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0073SKINNY) ||
  		(instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0071SKINNY)) {
  		instance->flag_ieee = 1;
  		sema_init(&instance->ioctl_sem, MEGASAS_SKINNY_INT_CMDS);
  	} else
  		sema_init(&instance->ioctl_sem, MEGASAS_INT_CMDS);
  
  	megasas_dbg_lvl = 0;
  	instance->flag = 0;
  	instance->unload = 1;
  	instance->last_time = 0;
  	instance->disableOnlineCtrlReset = 1;
  
  	if ((instance->pdev->device == PCI_DEVICE_ID_LSI_FUSION) ||
  	    (instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER))
  		INIT_WORK(&instance->work_init, megasas_fusion_ocr_wq);
  	else
  		INIT_WORK(&instance->work_init, process_fw_state_change_wq);
  
  	/*
  	 * Initialize MFI Firmware
  	 */
  	if (megasas_init_fw(instance))
  		goto fail_init_mfi;
  
  	/*
  	 * Register IRQ
  	 */
  	if (instance->msix_vectors) {
  		for (i = 0 ; i < instance->msix_vectors; i++) {
  			instance->irq_context[i].instance = instance;
  			instance->irq_context[i].MSIxIndex = i;
  			if (request_irq(instance->msixentry[i].vector,
  					instance->instancet->service_isr, 0,
  					"megasas",
  					&instance->irq_context[i])) {
  				printk(KERN_DEBUG "megasas: Failed to "
  				       "register IRQ for vector %d.\n", i);
  				for (j = 0 ; j < i ; j++)
  					free_irq(
  						instance->msixentry[j].vector,
  						&instance->irq_context[j]);
  				goto fail_irq;
  			}
  		}
  	} else {
  		instance->irq_context[0].instance = instance;
  		instance->irq_context[0].MSIxIndex = 0;
  		if (request_irq(pdev->irq, instance->instancet->service_isr,
  				IRQF_SHARED, "megasas",
  				&instance->irq_context[0])) {
  			printk(KERN_DEBUG "megasas: Failed to register IRQ\n");
  			goto fail_irq;
  		}
  	}
  
  	instance->instancet->enable_intr(instance->reg_set);
  
  	/*
  	 * Store instance in PCI softstate
  	 */
  	pci_set_drvdata(pdev, instance);
  
  	/*
  	 * Add this controller to megasas_mgmt_info structure so that it
  	 * can be exported to management applications
  	 */
  	megasas_mgmt_info.count++;
  	megasas_mgmt_info.instance[megasas_mgmt_info.max_index] = instance;
  	megasas_mgmt_info.max_index++;
  
  	/*
  	 * Register with SCSI mid-layer
  	 */
  	if (megasas_io_attach(instance))
  		goto fail_io_attach;
  
  	instance->unload = 0;
  
  	/*
  	 * Initiate AEN (Asynchronous Event Notification)
  	 */
  	if (megasas_start_aen(instance)) {
  		printk(KERN_DEBUG "megasas: start aen failed\n");
  		goto fail_start_aen;
  	}
  
  	return 0;
  
        fail_start_aen:
        fail_io_attach:
  	megasas_mgmt_info.count--;
  	megasas_mgmt_info.instance[megasas_mgmt_info.max_index] = NULL;
  	megasas_mgmt_info.max_index--;
  
  	pci_set_drvdata(pdev, NULL);
  	instance->instancet->disable_intr(instance->reg_set);
  	if (instance->msix_vectors)
  		for (i = 0 ; i < instance->msix_vectors; i++)
  			free_irq(instance->msixentry[i].vector,
  				 &instance->irq_context[i]);
  	else
  		free_irq(instance->pdev->irq, &instance->irq_context[0]);
  fail_irq:
  	if ((instance->pdev->device == PCI_DEVICE_ID_LSI_FUSION) ||
  	    (instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER))
  		megasas_release_fusion(instance);
  	else
  		megasas_release_mfi(instance);
        fail_init_mfi:
  	if (instance->msix_vectors)
  		pci_disable_msix(instance->pdev);
        fail_alloc_dma_buf:
  	if (instance->evt_detail)
  		pci_free_consistent(pdev, sizeof(struct megasas_evt_detail),
  				    instance->evt_detail,
  				    instance->evt_detail_h);
  
  	if (instance->producer)
  		pci_free_consistent(pdev, sizeof(u32), instance->producer,
  				    instance->producer_h);
  	if (instance->consumer)
  		pci_free_consistent(pdev, sizeof(u32), instance->consumer,
  				    instance->consumer_h);
  	scsi_host_put(host);
  
        fail_alloc_instance:
        fail_set_dma_mask:
  	pci_disable_device(pdev);
  
  	return -ENODEV;
  }
  
  /**
   * megasas_flush_cache -	Requests FW to flush all its caches
   * @instance:			Adapter soft state
   */
  static void megasas_flush_cache(struct megasas_instance *instance)
  {
  	struct megasas_cmd *cmd;
  	struct megasas_dcmd_frame *dcmd;
  
  	if (instance->adprecovery == MEGASAS_HW_CRITICAL_ERROR)
  		return;
  
  	cmd = megasas_get_cmd(instance);
  
  	if (!cmd)
  		return;
  
  	dcmd = &cmd->frame->dcmd;
  
  	memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);
  
  	dcmd->cmd = MFI_CMD_DCMD;
  	dcmd->cmd_status = 0x0;
  	dcmd->sge_count = 0;
  	dcmd->flags = MFI_FRAME_DIR_NONE;
  	dcmd->timeout = 0;
  	dcmd->pad_0 = 0;
  	dcmd->data_xfer_len = 0;
  	dcmd->opcode = MR_DCMD_CTRL_CACHE_FLUSH;
  	dcmd->mbox.b[0] = MR_FLUSH_CTRL_CACHE | MR_FLUSH_DISK_CACHE;
  
  	megasas_issue_blocked_cmd(instance, cmd);
  
  	megasas_return_cmd(instance, cmd);
  
  	return;
  }
  
  /**
   * megasas_shutdown_controller -	Instructs FW to shutdown the controller
   * @instance:				Adapter soft state
   * @opcode:				Shutdown/Hibernate
   */
  static void megasas_shutdown_controller(struct megasas_instance *instance,
  					u32 opcode)
  {
  	struct megasas_cmd *cmd;
  	struct megasas_dcmd_frame *dcmd;
  
  	if (instance->adprecovery == MEGASAS_HW_CRITICAL_ERROR)
  		return;
  
  	cmd = megasas_get_cmd(instance);
  
  	if (!cmd)
  		return;
  
  	if (instance->aen_cmd)
  		megasas_issue_blocked_abort_cmd(instance, instance->aen_cmd);
  	if (instance->map_update_cmd)
  		megasas_issue_blocked_abort_cmd(instance,
  						instance->map_update_cmd);
  	dcmd = &cmd->frame->dcmd;
  
  	memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);
  
  	dcmd->cmd = MFI_CMD_DCMD;
  	dcmd->cmd_status = 0x0;
  	dcmd->sge_count = 0;
  	dcmd->flags = MFI_FRAME_DIR_NONE;
  	dcmd->timeout = 0;
  	dcmd->pad_0 = 0;
  	dcmd->data_xfer_len = 0;
  	dcmd->opcode = opcode;
  
  	megasas_issue_blocked_cmd(instance, cmd);
  
  	megasas_return_cmd(instance, cmd);
  
  	return;
  }
  
  #ifdef CONFIG_PM
  /**
   * megasas_suspend -	driver suspend entry point
   * @pdev:		PCI device structure
   * @state:		PCI power state to suspend routine
   */
  static int
  megasas_suspend(struct pci_dev *pdev, pm_message_t state)
  {
  	struct Scsi_Host *host;
  	struct megasas_instance *instance;
  	int i;
  
  	instance = pci_get_drvdata(pdev);
  	host = instance->host;
  	instance->unload = 1;
  
  	megasas_flush_cache(instance);
  	megasas_shutdown_controller(instance, MR_DCMD_HIBERNATE_SHUTDOWN);
  
  	/* cancel the delayed work if this work still in queue */
  	if (instance->ev != NULL) {
  		struct megasas_aen_event *ev = instance->ev;
  		cancel_delayed_work_sync(&ev->hotplug_work);
  		instance->ev = NULL;
  	}
  
  	tasklet_kill(&instance->isr_tasklet);
  
  	pci_set_drvdata(instance->pdev, instance);
  	instance->instancet->disable_intr(instance->reg_set);
  
  	if (instance->msix_vectors)
  		for (i = 0 ; i < instance->msix_vectors; i++)
  			free_irq(instance->msixentry[i].vector,
  				 &instance->irq_context[i]);
  	else
  		free_irq(instance->pdev->irq, &instance->irq_context[0]);
  	if (instance->msix_vectors)
  		pci_disable_msix(instance->pdev);
  
  	pci_save_state(pdev);
  	pci_disable_device(pdev);
  
  	pci_set_power_state(pdev, pci_choose_state(pdev, state));
  
  	return 0;
  }
  
  /**
   * megasas_resume-      driver resume entry point
   * @pdev:               PCI device structure
   */
  static int
  megasas_resume(struct pci_dev *pdev)
  {
  	int rval, i, j;
  	struct Scsi_Host *host;
  	struct megasas_instance *instance;
  
  	instance = pci_get_drvdata(pdev);
  	host = instance->host;
  	pci_set_power_state(pdev, PCI_D0);
  	pci_enable_wake(pdev, PCI_D0, 0);
  	pci_restore_state(pdev);
  
  	/*
  	 * PCI prepping: enable device set bus mastering and dma mask
  	 */
  	rval = pci_enable_device_mem(pdev);
  
  	if (rval) {
  		printk(KERN_ERR "megasas: Enable device failed\n");
  		return rval;
  	}
  
  	pci_set_master(pdev);
  
  	if (megasas_set_dma_mask(pdev))
  		goto fail_set_dma_mask;
  
  	/*
  	 * Initialize MFI Firmware
  	 */
  
  	atomic_set(&instance->fw_outstanding, 0);
  
  	/*
  	 * We expect the FW state to be READY
  	 */
  	if (megasas_transition_to_ready(instance, 0))
  		goto fail_ready_state;
  
  	/* Now re-enable MSI-X */
  	if (instance->msix_vectors)
  		pci_enable_msix(instance->pdev, instance->msixentry,
  				instance->msix_vectors);
  
  	switch (instance->pdev->device) {
  	case PCI_DEVICE_ID_LSI_FUSION:
  	case PCI_DEVICE_ID_LSI_INVADER:
  	{
  		megasas_reset_reply_desc(instance);
  		if (megasas_ioc_init_fusion(instance)) {
  			megasas_free_cmds(instance);
  			megasas_free_cmds_fusion(instance);
  			goto fail_init_mfi;
  		}
  		if (!megasas_get_map_info(instance))
  			megasas_sync_map_info(instance);
  	}
  	break;
  	default:
  		*instance->producer = 0;
  		*instance->consumer = 0;
  		if (megasas_issue_init_mfi(instance))
  			goto fail_init_mfi;
  		break;
  	}
  
  	tasklet_init(&instance->isr_tasklet, instance->instancet->tasklet,
  		     (unsigned long)instance);
  
  	/*
  	 * Register IRQ
  	 */
  	if (instance->msix_vectors) {
  		for (i = 0 ; i < instance->msix_vectors; i++) {
  			instance->irq_context[i].instance = instance;
  			instance->irq_context[i].MSIxIndex = i;
  			if (request_irq(instance->msixentry[i].vector,
  					instance->instancet->service_isr, 0,
  					"megasas",
  					&instance->irq_context[i])) {
  				printk(KERN_DEBUG "megasas: Failed to "
  				       "register IRQ for vector %d.\n", i);
  				for (j = 0 ; j < i ; j++)
  					free_irq(
  						instance->msixentry[j].vector,
  						&instance->irq_context[j]);
  				goto fail_irq;
  			}
  		}
  	} else {
  		instance->irq_context[0].instance = instance;
  		instance->irq_context[0].MSIxIndex = 0;
  		if (request_irq(pdev->irq, instance->instancet->service_isr,
  				IRQF_SHARED, "megasas",
  				&instance->irq_context[0])) {
  			printk(KERN_DEBUG "megasas: Failed to register IRQ\n");
  			goto fail_irq;
  		}
  	}
  
  	instance->instancet->enable_intr(instance->reg_set);
  	instance->unload = 0;
  
  	/*
  	 * Initiate AEN (Asynchronous Event Notification)
  	 */
  	if (megasas_start_aen(instance))
  		printk(KERN_ERR "megasas: Start AEN failed\n");
  
  	return 0;
  
  fail_irq:
  fail_init_mfi:
  	if (instance->evt_detail)
  		pci_free_consistent(pdev, sizeof(struct megasas_evt_detail),
  				instance->evt_detail,
  				instance->evt_detail_h);
  
  	if (instance->producer)
  		pci_free_consistent(pdev, sizeof(u32), instance->producer,
  				instance->producer_h);
  	if (instance->consumer)
  		pci_free_consistent(pdev, sizeof(u32), instance->consumer,
  				instance->consumer_h);
  	scsi_host_put(host);
  
  fail_set_dma_mask:
  fail_ready_state:
  
  	pci_disable_device(pdev);
  
  	return -ENODEV;
  }
  #else
  #define megasas_suspend	NULL
  #define megasas_resume	NULL
  #endif
  
  /**
   * megasas_detach_one -	PCI hot"un"plug entry point
   * @pdev:		PCI device structure
   */
  static void megasas_detach_one(struct pci_dev *pdev)
  {
  	int i;
  	struct Scsi_Host *host;
  	struct megasas_instance *instance;
  	struct fusion_context *fusion;
  
  	instance = pci_get_drvdata(pdev);
  	instance->unload = 1;
  	host = instance->host;
  	fusion = instance->ctrl_context;
  
  	scsi_remove_host(instance->host);
  	megasas_flush_cache(instance);
  	megasas_shutdown_controller(instance, MR_DCMD_CTRL_SHUTDOWN);
  
  	/* cancel the delayed work if this work still in queue*/
  	if (instance->ev != NULL) {
  		struct megasas_aen_event *ev = instance->ev;
  		cancel_delayed_work_sync(&ev->hotplug_work);
  		instance->ev = NULL;
  	}
  
  	tasklet_kill(&instance->isr_tasklet);
  
  	/*
  	 * Take the instance off the instance array. Note that we will not
  	 * decrement the max_index. We let this array be sparse array
  	 */
  	for (i = 0; i < megasas_mgmt_info.max_index; i++) {
  		if (megasas_mgmt_info.instance[i] == instance) {
  			megasas_mgmt_info.count--;
  			megasas_mgmt_info.instance[i] = NULL;
  
  			break;
  		}
  	}
  
  	pci_set_drvdata(instance->pdev, NULL);
  
  	instance->instancet->disable_intr(instance->reg_set);
  
  	if (instance->msix_vectors)
  		for (i = 0 ; i < instance->msix_vectors; i++)
  			free_irq(instance->msixentry[i].vector,
  				 &instance->irq_context[i]);
  	else
  		free_irq(instance->pdev->irq, &instance->irq_context[0]);
  	if (instance->msix_vectors)
  		pci_disable_msix(instance->pdev);
  
  	switch (instance->pdev->device) {
  	case PCI_DEVICE_ID_LSI_FUSION:
  	case PCI_DEVICE_ID_LSI_INVADER:
  		megasas_release_fusion(instance);
  		for (i = 0; i < 2 ; i++)
  			if (fusion->ld_map[i])
  				dma_free_coherent(&instance->pdev->dev,
  						  fusion->map_sz,
  						  fusion->ld_map[i],
  						  fusion->
  						  ld_map_phys[i]);
  		kfree(instance->ctrl_context);
  		break;
  	default:
  		megasas_release_mfi(instance);
  		pci_free_consistent(pdev,
  				    sizeof(struct megasas_evt_detail),
  				    instance->evt_detail,
  				    instance->evt_detail_h);
  		pci_free_consistent(pdev, sizeof(u32),
  				    instance->producer,
  				    instance->producer_h);
  		pci_free_consistent(pdev, sizeof(u32),
  				    instance->consumer,
  				    instance->consumer_h);
  		break;
  	}
  
  	scsi_host_put(host);
  
  	pci_set_drvdata(pdev, NULL);
  
  	pci_disable_device(pdev);
  
  	return;
  }
  
  /**
   * megasas_shutdown -	Shutdown entry point
   * @device:		Generic device structure
   */
  static void megasas_shutdown(struct pci_dev *pdev)
  {
  	int i;
  	struct megasas_instance *instance = pci_get_drvdata(pdev);
  
  	instance->unload = 1;
  	megasas_flush_cache(instance);
  	megasas_shutdown_controller(instance, MR_DCMD_CTRL_SHUTDOWN);
  	instance->instancet->disable_intr(instance->reg_set);
  	if (instance->msix_vectors)
  		for (i = 0 ; i < instance->msix_vectors; i++)
  			free_irq(instance->msixentry[i].vector,
  				 &instance->irq_context[i]);
  	else
  		free_irq(instance->pdev->irq, &instance->irq_context[0]);
  	if (instance->msix_vectors)
  		pci_disable_msix(instance->pdev);
  }
  
  /**
   * megasas_mgmt_open -	char node "open" entry point
   */
  static int megasas_mgmt_open(struct inode *inode, struct file *filep)
  {
  	/*
  	 * Allow only those users with admin rights
  	 */
  	if (!capable(CAP_SYS_ADMIN))
  		return -EACCES;
  
  	return 0;
  }
  
  /**
   * megasas_mgmt_fasync -	Async notifier registration from applications
   *
   * This function adds the calling process to a driver global queue. When an
   * event occurs, SIGIO will be sent to all processes in this queue.
   */
  static int megasas_mgmt_fasync(int fd, struct file *filep, int mode)
  {
  	int rc;
  
  	mutex_lock(&megasas_async_queue_mutex);
  
  	rc = fasync_helper(fd, filep, mode, &megasas_async_queue);
  
  	mutex_unlock(&megasas_async_queue_mutex);
  
  	if (rc >= 0) {
  		/* For sanity check when we get ioctl */
  		filep->private_data = filep;
  		return 0;
  	}
  
  	printk(KERN_DEBUG "megasas: fasync_helper failed [%d]\n", rc);
  
  	return rc;
  }
  
  /**
   * megasas_mgmt_poll -  char node "poll" entry point
   * */
  static unsigned int megasas_mgmt_poll(struct file *file, poll_table *wait)
  {
  	unsigned int mask;
  	unsigned long flags;
  	poll_wait(file, &megasas_poll_wait, wait);
  	spin_lock_irqsave(&poll_aen_lock, flags);
  	if (megasas_poll_wait_aen)
  		mask =   (POLLIN | POLLRDNORM);
  	else
  		mask = 0;
  	spin_unlock_irqrestore(&poll_aen_lock, flags);
  	return mask;
  }
  
  /**
   * megasas_mgmt_fw_ioctl -	Issues management ioctls to FW
   * @instance:			Adapter soft state
   * @argp:			User's ioctl packet
   */
  static int
  megasas_mgmt_fw_ioctl(struct megasas_instance *instance,
  		      struct megasas_iocpacket __user * user_ioc,
  		      struct megasas_iocpacket *ioc)
  {
  	struct megasas_sge32 *kern_sge32;
  	struct megasas_cmd *cmd;
  	void *kbuff_arr[MAX_IOCTL_SGE];
  	dma_addr_t buf_handle = 0;
  	int error = 0, i;
  	void *sense = NULL;
  	dma_addr_t sense_handle;
  	unsigned long *sense_ptr;
  
  	memset(kbuff_arr, 0, sizeof(kbuff_arr));
  
  	if (ioc->sge_count > MAX_IOCTL_SGE) {
  		printk(KERN_DEBUG "megasas: SGE count [%d] >  max limit [%d]\n",
  		       ioc->sge_count, MAX_IOCTL_SGE);
  		return -EINVAL;
  	}
  
  	cmd = megasas_get_cmd(instance);
  	if (!cmd) {
  		printk(KERN_DEBUG "megasas: Failed to get a cmd packet\n");
  		return -ENOMEM;
  	}
  
  	/*
  	 * User's IOCTL packet has 2 frames (maximum). Copy those two
  	 * frames into our cmd's frames. cmd->frame's context will get
  	 * overwritten when we copy from user's frames. So set that value
  	 * alone separately
  	 */
  	memcpy(cmd->frame, ioc->frame.raw, 2 * MEGAMFI_FRAME_SIZE);
  	cmd->frame->hdr.context = cmd->index;
  	cmd->frame->hdr.pad_0 = 0;
  	cmd->frame->hdr.flags &= ~(MFI_FRAME_IEEE | MFI_FRAME_SGL64 |
  				   MFI_FRAME_SENSE64);
  
  	/*
  	 * The management interface between applications and the fw uses
  	 * MFI frames. E.g, RAID configuration changes, LD property changes
  	 * etc are accomplishes through different kinds of MFI frames. The
  	 * driver needs to care only about substituting user buffers with
  	 * kernel buffers in SGLs. The location of SGL is embedded in the
  	 * struct iocpacket itself.
  	 */
  	kern_sge32 = (struct megasas_sge32 *)
  	    ((unsigned long)cmd->frame + ioc->sgl_off);
  
  	/*
  	 * For each user buffer, create a mirror buffer and copy in
  	 */
  	for (i = 0; i < ioc->sge_count; i++) {
  		if (!ioc->sgl[i].iov_len)
  			continue;
  
  		kbuff_arr[i] = dma_alloc_coherent(&instance->pdev->dev,
  						    ioc->sgl[i].iov_len,
  						    &buf_handle, GFP_KERNEL);
  		if (!kbuff_arr[i]) {
  			printk(KERN_DEBUG "megasas: Failed to alloc "
  			       "kernel SGL buffer for IOCTL \n");
  			error = -ENOMEM;
  			goto out;
  		}
  
  		/*
  		 * We don't change the dma_coherent_mask, so
  		 * pci_alloc_consistent only returns 32bit addresses
  		 */
  		kern_sge32[i].phys_addr = (u32) buf_handle;
  		kern_sge32[i].length = ioc->sgl[i].iov_len;
  
  		/*
  		 * We created a kernel buffer corresponding to the
  		 * user buffer. Now copy in from the user buffer
  		 */
  		if (copy_from_user(kbuff_arr[i], ioc->sgl[i].iov_base,
  				   (u32) (ioc->sgl[i].iov_len))) {
  			error = -EFAULT;
  			goto out;
  		}
  	}
  
  	if (ioc->sense_len) {
  		sense = dma_alloc_coherent(&instance->pdev->dev, ioc->sense_len,
  					     &sense_handle, GFP_KERNEL);
  		if (!sense) {
  			error = -ENOMEM;
  			goto out;
  		}
  
  		sense_ptr =
  		(unsigned long *) ((unsigned long)cmd->frame + ioc->sense_off);
  		*sense_ptr = sense_handle;
  	}
  
  	/*
  	 * Set the sync_cmd flag so that the ISR knows not to complete this
  	 * cmd to the SCSI mid-layer
  	 */
  	cmd->sync_cmd = 1;
  	megasas_issue_blocked_cmd(instance, cmd);
  	cmd->sync_cmd = 0;
  
  	/*
  	 * copy out the kernel buffers to user buffers
  	 */
  	for (i = 0; i < ioc->sge_count; i++) {
  		if (copy_to_user(ioc->sgl[i].iov_base, kbuff_arr[i],
  				 ioc->sgl[i].iov_len)) {
  			error = -EFAULT;
  			goto out;
  		}
  	}
  
  	/*
  	 * copy out the sense
  	 */
  	if (ioc->sense_len) {
  		/*
  		 * sense_ptr points to the location that has the user
  		 * sense buffer address
  		 */
  		sense_ptr = (unsigned long *) ((unsigned long)ioc->frame.raw +
  				ioc->sense_off);
  
  		if (copy_to_user((void __user *)((unsigned long)(*sense_ptr)),
  				 sense, ioc->sense_len)) {
  			printk(KERN_ERR "megasas: Failed to copy out to user "
  					"sense data\n");
  			error = -EFAULT;
  			goto out;
  		}
  	}
  
  	/*
  	 * copy the status codes returned by the fw
  	 */
  	if (copy_to_user(&user_ioc->frame.hdr.cmd_status,
  			 &cmd->frame->hdr.cmd_status, sizeof(u8))) {
  		printk(KERN_DEBUG "megasas: Error copying out cmd_status\n");
  		error = -EFAULT;
  	}
  
        out:
  	if (sense) {
  		dma_free_coherent(&instance->pdev->dev, ioc->sense_len,
  				    sense, sense_handle);
  	}
  
  	for (i = 0; i < ioc->sge_count; i++) {
  		if (kbuff_arr[i])
  			dma_free_coherent(&instance->pdev->dev,
  					  kern_sge32[i].length,
  					  kbuff_arr[i],
  					  kern_sge32[i].phys_addr);
  	}
  
  	megasas_return_cmd(instance, cmd);
  	return error;
  }
  
  static int megasas_mgmt_ioctl_fw(struct file *file, unsigned long arg)
  {
  	struct megasas_iocpacket __user *user_ioc =
  	    (struct megasas_iocpacket __user *)arg;
  	struct megasas_iocpacket *ioc;
  	struct megasas_instance *instance;
  	int error;
  	int i;
  	unsigned long flags;
  	u32 wait_time = MEGASAS_RESET_WAIT_TIME;
  
  	ioc = kmalloc(sizeof(*ioc), GFP_KERNEL);
  	if (!ioc)
  		return -ENOMEM;
  
  	if (copy_from_user(ioc, user_ioc, sizeof(*ioc))) {
  		error = -EFAULT;
  		goto out_kfree_ioc;
  	}
  
  	instance = megasas_lookup_instance(ioc->host_no);
  	if (!instance) {
  		error = -ENODEV;
  		goto out_kfree_ioc;
  	}
  
  	if (instance->adprecovery == MEGASAS_HW_CRITICAL_ERROR) {
  		printk(KERN_ERR "Controller in crit error\n");
  		error = -ENODEV;
  		goto out_kfree_ioc;
  	}
  
  	if (instance->unload == 1) {
  		error = -ENODEV;
  		goto out_kfree_ioc;
  	}
  
  	/*
  	 * We will allow only MEGASAS_INT_CMDS number of parallel ioctl cmds
  	 */
  	if (down_interruptible(&instance->ioctl_sem)) {
  		error = -ERESTARTSYS;
  		goto out_kfree_ioc;
  	}
  
  	for (i = 0; i < wait_time; i++) {
  
  		spin_lock_irqsave(&instance->hba_lock, flags);
  		if (instance->adprecovery == MEGASAS_HBA_OPERATIONAL) {
  			spin_unlock_irqrestore(&instance->hba_lock, flags);
  			break;
  		}
  		spin_unlock_irqrestore(&instance->hba_lock, flags);
  
  		if (!(i % MEGASAS_RESET_NOTICE_INTERVAL)) {
  			printk(KERN_NOTICE "megasas: waiting"
  				"for controller reset to finish\n");
  		}
  
  		msleep(1000);
  	}
  
  	spin_lock_irqsave(&instance->hba_lock, flags);
  	if (instance->adprecovery != MEGASAS_HBA_OPERATIONAL) {
  		spin_unlock_irqrestore(&instance->hba_lock, flags);
  
  		printk(KERN_ERR "megaraid_sas: timed out while"
  			"waiting for HBA to recover\n");
  		error = -ENODEV;
  		goto out_up;
  	}
  	spin_unlock_irqrestore(&instance->hba_lock, flags);
  
  	error = megasas_mgmt_fw_ioctl(instance, user_ioc, ioc);
        out_up:
  	up(&instance->ioctl_sem);
  
        out_kfree_ioc:
  	kfree(ioc);
  	return error;
  }
  
  static int megasas_mgmt_ioctl_aen(struct file *file, unsigned long arg)
  {
  	struct megasas_instance *instance;
  	struct megasas_aen aen;
  	int error;
  	int i;
  	unsigned long flags;
  	u32 wait_time = MEGASAS_RESET_WAIT_TIME;
  
  	if (file->private_data != file) {
  		printk(KERN_DEBUG "megasas: fasync_helper was not "
  		       "called first\n");
  		return -EINVAL;
  	}
  
  	if (copy_from_user(&aen, (void __user *)arg, sizeof(aen)))
  		return -EFAULT;
  
  	instance = megasas_lookup_instance(aen.host_no);
  
  	if (!instance)
  		return -ENODEV;
  
  	if (instance->adprecovery == MEGASAS_HW_CRITICAL_ERROR) {
  		return -ENODEV;
  	}
  
  	if (instance->unload == 1) {
  		return -ENODEV;
  	}
  
  	for (i = 0; i < wait_time; i++) {
  
  		spin_lock_irqsave(&instance->hba_lock, flags);
  		if (instance->adprecovery == MEGASAS_HBA_OPERATIONAL) {
  			spin_unlock_irqrestore(&instance->hba_lock,
  						flags);
  			break;
  		}
  
  		spin_unlock_irqrestore(&instance->hba_lock, flags);
  
  		if (!(i % MEGASAS_RESET_NOTICE_INTERVAL)) {
  			printk(KERN_NOTICE "megasas: waiting for"
  				"controller reset to finish\n");
  		}
  
  		msleep(1000);
  	}
  
  	spin_lock_irqsave(&instance->hba_lock, flags);
  	if (instance->adprecovery != MEGASAS_HBA_OPERATIONAL) {
  		spin_unlock_irqrestore(&instance->hba_lock, flags);
  		printk(KERN_ERR "megaraid_sas: timed out while waiting"
  				"for HBA to recover.\n");
  		return -ENODEV;
  	}
  	spin_unlock_irqrestore(&instance->hba_lock, flags);
  
  	mutex_lock(&instance->aen_mutex);
  	error = megasas_register_aen(instance, aen.seq_num,
  				     aen.class_locale_word);
  	mutex_unlock(&instance->aen_mutex);
  	return error;
  }
  
  /**
   * megasas_mgmt_ioctl -	char node ioctl entry point
   */
  static long
  megasas_mgmt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
  {
  	switch (cmd) {
  	case MEGASAS_IOC_FIRMWARE:
  		return megasas_mgmt_ioctl_fw(file, arg);
  
  	case MEGASAS_IOC_GET_AEN:
  		return megasas_mgmt_ioctl_aen(file, arg);
  	}
  
  	return -ENOTTY;
  }
  
  #ifdef CONFIG_COMPAT
  static int megasas_mgmt_compat_ioctl_fw(struct file *file, unsigned long arg)
  {
  	struct compat_megasas_iocpacket __user *cioc =
  	    (struct compat_megasas_iocpacket __user *)arg;
  	struct megasas_iocpacket __user *ioc =
  	    compat_alloc_user_space(sizeof(struct megasas_iocpacket));
  	int i;
  	int error = 0;
  	compat_uptr_t ptr;
  	unsigned long local_raw_ptr;
  	u32 local_sense_off;
  	u32 local_sense_len;
  
  	if (clear_user(ioc, sizeof(*ioc)))
  		return -EFAULT;
  
  	if (copy_in_user(&ioc->host_no, &cioc->host_no, sizeof(u16)) ||
  	    copy_in_user(&ioc->sgl_off, &cioc->sgl_off, sizeof(u32)) ||
  	    copy_in_user(&ioc->sense_off, &cioc->sense_off, sizeof(u32)) ||
  	    copy_in_user(&ioc->sense_len, &cioc->sense_len, sizeof(u32)) ||
  	    copy_in_user(ioc->frame.raw, cioc->frame.raw, 128) ||
  	    copy_in_user(&ioc->sge_count, &cioc->sge_count, sizeof(u32)))
  		return -EFAULT;
  
  	/*
  	 * The sense_ptr is used in megasas_mgmt_fw_ioctl only when
  	 * sense_len is not null, so prepare the 64bit value under
  	 * the same condition.
  	 */
  	if (get_user(local_raw_ptr, ioc->frame.raw) ||
  		get_user(local_sense_off, &ioc->sense_off) ||
  		get_user(local_sense_len, &ioc->sense_len))
  		return -EFAULT;
  
  
  	if (local_sense_len) {
  		void __user **sense_ioc_ptr =
  			(void __user **)((u8*)local_raw_ptr + local_sense_off);
  		compat_uptr_t *sense_cioc_ptr =
  			(compat_uptr_t *)(cioc->frame.raw + cioc->sense_off);
  		if (get_user(ptr, sense_cioc_ptr) ||
  		    put_user(compat_ptr(ptr), sense_ioc_ptr))
  			return -EFAULT;
  	}
  
  	for (i = 0; i < MAX_IOCTL_SGE; i++) {
  		if (get_user(ptr, &cioc->sgl[i].iov_base) ||
  		    put_user(compat_ptr(ptr), &ioc->sgl[i].iov_base) ||
  		    copy_in_user(&ioc->sgl[i].iov_len,
  				 &cioc->sgl[i].iov_len, sizeof(compat_size_t)))
  			return -EFAULT;
  	}
  
  	error = megasas_mgmt_ioctl_fw(file, (unsigned long)ioc);
  
  	if (copy_in_user(&cioc->frame.hdr.cmd_status,
  			 &ioc->frame.hdr.cmd_status, sizeof(u8))) {
  		printk(KERN_DEBUG "megasas: error copy_in_user cmd_status\n");
  		return -EFAULT;
  	}
  	return error;
  }
  
  static long
  megasas_mgmt_compat_ioctl(struct file *file, unsigned int cmd,
  			  unsigned long arg)
  {
  	switch (cmd) {
  	case MEGASAS_IOC_FIRMWARE32:
  		return megasas_mgmt_compat_ioctl_fw(file, arg);
  	case MEGASAS_IOC_GET_AEN:
  		return megasas_mgmt_ioctl_aen(file, arg);
  	}
  
  	return -ENOTTY;
  }
  #endif
  
  /*
   * File operations structure for management interface
   */
  static const struct file_operations megasas_mgmt_fops = {
  	.owner = THIS_MODULE,
  	.open = megasas_mgmt_open,
  	.fasync = megasas_mgmt_fasync,
  	.unlocked_ioctl = megasas_mgmt_ioctl,
  	.poll = megasas_mgmt_poll,
  #ifdef CONFIG_COMPAT
  	.compat_ioctl = megasas_mgmt_compat_ioctl,
  #endif
  	.llseek = noop_llseek,
  };
  
  /*
   * PCI hotplug support registration structure
   */
  static struct pci_driver megasas_pci_driver = {
  
  	.name = "megaraid_sas",
  	.id_table = megasas_pci_table,
  	.probe = megasas_probe_one,
  	.remove = megasas_detach_one,
  	.suspend = megasas_suspend,
  	.resume = megasas_resume,
  	.shutdown = megasas_shutdown,
  };
  
  /*
   * Sysfs driver attributes
   */
  static ssize_t megasas_sysfs_show_version(struct device_driver *dd, char *buf)
  {
  	return snprintf(buf, strlen(MEGASAS_VERSION) + 2, "%s\n",
  			MEGASAS_VERSION);
  }
  
  static DRIVER_ATTR(version, S_IRUGO, megasas_sysfs_show_version, NULL);
  
  static ssize_t
  megasas_sysfs_show_release_date(struct device_driver *dd, char *buf)
  {
  	return snprintf(buf, strlen(MEGASAS_RELDATE) + 2, "%s\n",
  			MEGASAS_RELDATE);
  }
  
  static DRIVER_ATTR(release_date, S_IRUGO, megasas_sysfs_show_release_date,
  		   NULL);
  
  static ssize_t
  megasas_sysfs_show_support_poll_for_event(struct device_driver *dd, char *buf)
  {
  	return sprintf(buf, "%u\n", support_poll_for_event);
  }
  
  static DRIVER_ATTR(support_poll_for_event, S_IRUGO,
  			megasas_sysfs_show_support_poll_for_event, NULL);
  
   static ssize_t
  megasas_sysfs_show_support_device_change(struct device_driver *dd, char *buf)
  {
  	return sprintf(buf, "%u\n", support_device_change);
  }
  
  static DRIVER_ATTR(support_device_change, S_IRUGO,
  			megasas_sysfs_show_support_device_change, NULL);
  
  static ssize_t
  megasas_sysfs_show_dbg_lvl(struct device_driver *dd, char *buf)
  {
  	return sprintf(buf, "%u\n", megasas_dbg_lvl);
  }
  
  static ssize_t
  megasas_sysfs_set_dbg_lvl(struct device_driver *dd, const char *buf, size_t count)
  {
  	int retval = count;
  	if(sscanf(buf,"%u",&megasas_dbg_lvl)<1){
  		printk(KERN_ERR "megasas: could not set dbg_lvl\n");
  		retval = -EINVAL;
  	}
  	return retval;
  }
  
  static DRIVER_ATTR(dbg_lvl, S_IRUGO|S_IWUSR, megasas_sysfs_show_dbg_lvl,
  		megasas_sysfs_set_dbg_lvl);
  
  static void
  megasas_aen_polling(struct work_struct *work)
  {
  	struct megasas_aen_event *ev =
  		container_of(work, struct megasas_aen_event, hotplug_work.work);
  	struct megasas_instance *instance = ev->instance;
  	union megasas_evt_class_locale class_locale;
  	struct  Scsi_Host *host;
  	struct  scsi_device *sdev1;
  	u16     pd_index = 0;
  	u16	ld_index = 0;
  	int     i, j, doscan = 0;
  	u32 seq_num;
  	int error;
  
  	if (!instance) {
  		printk(KERN_ERR "invalid instance!\n");
  		kfree(ev);
  		return;
  	}
  	instance->ev = NULL;
  	host = instance->host;
  	if (instance->evt_detail) {
  
  		switch (instance->evt_detail->code) {
  		case MR_EVT_PD_INSERTED:
  			if (megasas_get_pd_list(instance) == 0) {
  			for (i = 0; i < MEGASAS_MAX_PD_CHANNELS; i++) {
  				for (j = 0;
  				j < MEGASAS_MAX_DEV_PER_CHANNEL;
  				j++) {
  
  				pd_index =
  				(i * MEGASAS_MAX_DEV_PER_CHANNEL) + j;
  
  				sdev1 =
  				scsi_device_lookup(host, i, j, 0);
  
  				if (instance->pd_list[pd_index].driveState
  						== MR_PD_STATE_SYSTEM) {
  						if (!sdev1) {
  						scsi_add_device(host, i, j, 0);
  						}
  
  					if (sdev1)
  						scsi_device_put(sdev1);
  					}
  				}
  			}
  			}
  			doscan = 0;
  			break;
  
  		case MR_EVT_PD_REMOVED:
  			if (megasas_get_pd_list(instance) == 0) {
  			for (i = 0; i < MEGASAS_MAX_PD_CHANNELS; i++) {
  				for (j = 0;
  				j < MEGASAS_MAX_DEV_PER_CHANNEL;
  				j++) {
  
  				pd_index =
  				(i * MEGASAS_MAX_DEV_PER_CHANNEL) + j;
  
  				sdev1 =
  				scsi_device_lookup(host, i, j, 0);
  
  				if (instance->pd_list[pd_index].driveState
  					== MR_PD_STATE_SYSTEM) {
  					if (sdev1) {
  						scsi_device_put(sdev1);
  					}
  				} else {
  					if (sdev1) {
  						scsi_remove_device(sdev1);
  						scsi_device_put(sdev1);
  					}
  				}
  				}
  			}
  			}
  			doscan = 0;
  			break;
  
  		case MR_EVT_LD_OFFLINE:
  		case MR_EVT_CFG_CLEARED:
  		case MR_EVT_LD_DELETED:
  			megasas_get_ld_list(instance);
  			for (i = 0; i < MEGASAS_MAX_LD_CHANNELS; i++) {
  				for (j = 0;
  				j < MEGASAS_MAX_DEV_PER_CHANNEL;
  				j++) {
  
  				ld_index =
  				(i * MEGASAS_MAX_DEV_PER_CHANNEL) + j;
  
  				sdev1 = scsi_device_lookup(host,
  					i + MEGASAS_MAX_LD_CHANNELS,
  					j,
  					0);
  
  				if (instance->ld_ids[ld_index] != 0xff) {
  					if (sdev1) {
  						scsi_device_put(sdev1);
  					}
  				} else {
  					if (sdev1) {
  						scsi_remove_device(sdev1);
  						scsi_device_put(sdev1);
  					}
  				}
  				}
  			}
  			doscan = 0;
  			break;
  		case MR_EVT_LD_CREATED:
  			megasas_get_ld_list(instance);
  			for (i = 0; i < MEGASAS_MAX_LD_CHANNELS; i++) {
  				for (j = 0;
  					j < MEGASAS_MAX_DEV_PER_CHANNEL;
  					j++) {
  					ld_index =
  					(i * MEGASAS_MAX_DEV_PER_CHANNEL) + j;
  
  					sdev1 = scsi_device_lookup(host,
  						i+MEGASAS_MAX_LD_CHANNELS,
  						j, 0);
  
  					if (instance->ld_ids[ld_index] !=
  								0xff) {
  						if (!sdev1) {
  							scsi_add_device(host,
  								i + 2,
  								j, 0);
  						}
  					}
  					if (sdev1) {
  						scsi_device_put(sdev1);
  					}
  				}
  			}
  			doscan = 0;
  			break;
  		case MR_EVT_CTRL_HOST_BUS_SCAN_REQUESTED:
  		case MR_EVT_FOREIGN_CFG_IMPORTED:
  		case MR_EVT_LD_STATE_CHANGE:
  			doscan = 1;
  			break;
  		default:
  			doscan = 0;
  			break;
  		}
  	} else {
  		printk(KERN_ERR "invalid evt_detail!\n");
  		kfree(ev);
  		return;
  	}
  
  	if (doscan) {
  		printk(KERN_INFO "scanning ...\n");
  		megasas_get_pd_list(instance);
  		for (i = 0; i < MEGASAS_MAX_PD_CHANNELS; i++) {
  			for (j = 0; j < MEGASAS_MAX_DEV_PER_CHANNEL; j++) {
  				pd_index = i*MEGASAS_MAX_DEV_PER_CHANNEL + j;
  				sdev1 = scsi_device_lookup(host, i, j, 0);
  				if (instance->pd_list[pd_index].driveState ==
  							MR_PD_STATE_SYSTEM) {
  					if (!sdev1) {
  						scsi_add_device(host, i, j, 0);
  					}
  					if (sdev1)
  						scsi_device_put(sdev1);
  				} else {
  					if (sdev1) {
  						scsi_remove_device(sdev1);
  						scsi_device_put(sdev1);
  					}
  				}
  			}
  		}
  
  		megasas_get_ld_list(instance);
  		for (i = 0; i < MEGASAS_MAX_LD_CHANNELS; i++) {
  			for (j = 0; j < MEGASAS_MAX_DEV_PER_CHANNEL; j++) {
  				ld_index =
  				(i * MEGASAS_MAX_DEV_PER_CHANNEL) + j;
  
  				sdev1 = scsi_device_lookup(host,
  					i+MEGASAS_MAX_LD_CHANNELS, j, 0);
  				if (instance->ld_ids[ld_index] != 0xff) {
  					if (!sdev1) {
  						scsi_add_device(host,
  								i+2,
  								j, 0);
  					} else {
  						scsi_device_put(sdev1);
  					}
  				} else {
  					if (sdev1) {
  						scsi_remove_device(sdev1);
  						scsi_device_put(sdev1);
  					}
  				}
  			}
  		}
  	}
  
  	if ( instance->aen_cmd != NULL ) {
  		kfree(ev);
  		return ;
  	}
  
  	seq_num = instance->evt_detail->seq_num + 1;
  
  	/* Register AEN with FW for latest sequence number plus 1 */
  	class_locale.members.reserved = 0;
  	class_locale.members.locale = MR_EVT_LOCALE_ALL;
  	class_locale.members.class = MR_EVT_CLASS_DEBUG;
  	mutex_lock(&instance->aen_mutex);
  	error = megasas_register_aen(instance, seq_num,
  					class_locale.word);
  	mutex_unlock(&instance->aen_mutex);
  
  	if (error)
  		printk(KERN_ERR "register aen failed error %x\n", error);
  
  	kfree(ev);
  }
  
  /**
   * megasas_init - Driver load entry point
   */
  static int __init megasas_init(void)
  {
  	int rval;
  
  	/*
  	 * Announce driver version and other information
  	 */
  	printk(KERN_INFO "megasas: %s %s\n", MEGASAS_VERSION,
  	       MEGASAS_EXT_VERSION);
  
  	spin_lock_init(&poll_aen_lock);
  
  	support_poll_for_event = 2;
  	support_device_change = 1;
  
  	memset(&megasas_mgmt_info, 0, sizeof(megasas_mgmt_info));
  
  	/*
  	 * Register character device node
  	 */
  	rval = register_chrdev(0, "megaraid_sas_ioctl", &megasas_mgmt_fops);
  
  	if (rval < 0) {
  		printk(KERN_DEBUG "megasas: failed to open device node\n");
  		return rval;
  	}
  
  	megasas_mgmt_majorno = rval;
  
  	/*
  	 * Register ourselves as PCI hotplug module
  	 */
  	rval = pci_register_driver(&megasas_pci_driver);
  
  	if (rval) {
  		printk(KERN_DEBUG "megasas: PCI hotplug regisration failed \n");
  		goto err_pcidrv;
  	}
  
  	rval = driver_create_file(&megasas_pci_driver.driver,
  				  &driver_attr_version);
  	if (rval)
  		goto err_dcf_attr_ver;
  	rval = driver_create_file(&megasas_pci_driver.driver,
  				  &driver_attr_release_date);
  	if (rval)
  		goto err_dcf_rel_date;
  
  	rval = driver_create_file(&megasas_pci_driver.driver,
  				&driver_attr_support_poll_for_event);
  	if (rval)
  		goto err_dcf_support_poll_for_event;
  
  	rval = driver_create_file(&megasas_pci_driver.driver,
  				  &driver_attr_dbg_lvl);
  	if (rval)
  		goto err_dcf_dbg_lvl;
  	rval = driver_create_file(&megasas_pci_driver.driver,
  				&driver_attr_support_device_change);
  	if (rval)
  		goto err_dcf_support_device_change;
  
  	return rval;
  
  err_dcf_support_device_change:
  	driver_remove_file(&megasas_pci_driver.driver,
  			   &driver_attr_dbg_lvl);
  err_dcf_dbg_lvl:
  	driver_remove_file(&megasas_pci_driver.driver,
  			&driver_attr_support_poll_for_event);
  
  err_dcf_support_poll_for_event:
  	driver_remove_file(&megasas_pci_driver.driver,
  			   &driver_attr_release_date);
  
  err_dcf_rel_date:
  	driver_remove_file(&megasas_pci_driver.driver, &driver_attr_version);
  err_dcf_attr_ver:
  	pci_unregister_driver(&megasas_pci_driver);
  err_pcidrv:
  	unregister_chrdev(megasas_mgmt_majorno, "megaraid_sas_ioctl");
  	return rval;
  }
  
  /**
   * megasas_exit - Driver unload entry point
   */
  static void __exit megasas_exit(void)
  {
  	driver_remove_file(&megasas_pci_driver.driver,
  			   &driver_attr_dbg_lvl);
  	driver_remove_file(&megasas_pci_driver.driver,
  			&driver_attr_support_poll_for_event);
  	driver_remove_file(&megasas_pci_driver.driver,
  			&driver_attr_support_device_change);
  	driver_remove_file(&megasas_pci_driver.driver,
  			   &driver_attr_release_date);
  	driver_remove_file(&megasas_pci_driver.driver, &driver_attr_version);
  
  	pci_unregister_driver(&megasas_pci_driver);
  	unregister_chrdev(megasas_mgmt_majorno, "megaraid_sas_ioctl");
  }
  
  module_init(megasas_init);
  module_exit(megasas_exit);
  