[SCSI] megaraid_sas: Rename megaraid_sas.c to megaraid_sas_base.c

This patch renames megaraid_sas.c to megaraid_sas_base.c to facilitate
other files in the compile.

Signed-off-by: Adam Radford <aradford@gmail.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 5193 insertions, 0 deletions

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
new file mode 100644
index 00000000000..427f0f79594
--- /dev/null
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -0,0 +1,5193 @@
+/*
+ *
+ *		Linux MegaRAID driver for SAS based RAID controllers
+ *
+ * Copyright (c) 2003-2005  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.
+ *
+ * FILE		: megaraid_sas.c
+ * Version     : v00.00.04.31-rc1
+ *
+ * Authors:
+ *	(email-id : megaraidlinux@lsi.com)
+ * 	Sreenivas Bagalkote
+ * 	Sumant Patro
+ *	Bo Yang
+ *
+ * List of supported controllers
+ *
+ * OEM	Product Name			VID	DID	SSVID	SSID
+ * ---	------------			---	---	----	----
+ */
+
+#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 "megaraid_sas.h"
+
+/*
+ * poll_mode_io:1- schedule complete completion from q cmd
+ */
+static unsigned int poll_mode_io;
+module_param_named(poll_mode_io, poll_mode_io, int, 0);
+MODULE_PARM_DESC(poll_mode_io,
+	"Complete cmds from IO path, (default=0)");
+
+/*
+ * 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");
+
+MODULE_LICENSE("GPL");
+MODULE_VERSION(MEGASAS_VERSION);
+MODULE_AUTHOR("megaraidlinux@lsi.com");
+MODULE_DESCRIPTION("LSI MegaRAID SAS Driver");
+
+static int megasas_transition_to_ready(struct megasas_instance *instance);
+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 */
+	{}
+};
+
+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;
+static u32 megasas_dbg_lvl;
+static u32 support_device_change;
+
+/* define lock for aen poll */
+spinlock_t poll_aen_lock;
+
+static void
+megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
+		     u8 alt_status);
+
+/**
+ * megasas_get_cmd -	Get a command from the free pool
+ * @instance:		Adapter soft state
+ *
+ * Returns a free command from the pool
+ */
+static 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
+ */
+static 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;
+	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,
+};
+
+/**
+*	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;
+	/*
+	 * Check if it is our interrupt
+	 */
+	status = readl(&regs->outbound_intr_status);
+
+	if (!(status & MFI_REPLY_1078_MESSAGE_INTERRUPT)) {
+		return 0;
+	}
+
+	/*
+	 * 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 1;
+}
+/**
+ * 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_adp_reset_ppc -	For controller reset
+ * @regs:				MFI register set
+ */
+static int
+megasas_adp_reset_ppc(struct megasas_instance *instance,
+			struct megasas_register_set __iomem *regs)
+{
+	return 0;
+}
+
+/**
+ * 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)
+{
+	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_ppc,
+	.check_reset = megasas_check_reset_ppc,
+};
+
+/**
+ * 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;
+	/*
+	 * Check if it is our interrupt
+	 */
+	status = readl(&regs->outbound_intr_status);
+
+	if (!(status & MFI_SKINNY_ENABLE_INTERRUPT_MASK)) {
+		return 0;
+	}
+
+	/*
+	 * 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 1;
+}
+
+/**
+ * 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_adp_reset_skinny -	For controller reset
+ * @regs:				MFI register set
+ */
+static int
+megasas_adp_reset_skinny(struct megasas_instance *instance,
+			struct megasas_register_set __iomem *regs)
+{
+	return 0;
+}
+
+/**
+ * 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)
+{
+	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_skinny,
+	.check_reset = megasas_check_reset_skinny,
+};
+
+
+/**
+*	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;
+
+	writel(0, &reg_set->seq_offset);
+	writel(4, &reg_set->seq_offset);
+	writel(0xb, &reg_set->seq_offset);
+	writel(2, &reg_set->seq_offset);
+	writel(7, &reg_set->seq_offset);
+	writel(0xd, &reg_set->seq_offset);
+	msleep(1000);
+
+	HostDiag = (u32)readl(&reg_set->host_diag);
+
+	while ( !( HostDiag & DIAG_WRITE_ENABLE) ) {
+		msleep(100);
+		HostDiag = (u32)readl(&reg_set->host_diag);
+		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), &reg_set->host_diag);
+
+	ssleep(10);
+
+	HostDiag = (u32)readl(&reg_set->host_diag);
+	while ( ( HostDiag & DIAG_RESET_ADAPTER) ) {
+		msleep(100);
+		HostDiag = (u32)readl(&reg_set->host_diag);
+		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,
+};
+
+/**
+*	This is the end of set of functions & definitions
+*       specific to gen2 (deviceid : 0x78, 0x79) controllers
+*/
+
+/**
+ * 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.
+ */
+static int
+megasas_issue_polled(struct megasas_instance *instance, struct megasas_cmd *cmd)
+{
+	int i;
+	u32 msecs = MFI_POLL_TIMEOUT_SECS * 1000;
+
+	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->fire_cmd(instance,
+			cmd->frame_phys_addr, 0, instance->reg_set);
+
+	/*
+	 * Wait for cmd_status to change
+	 */
+	for (i = 0; (i < msecs) && (frame_hdr->cmd_status == 0xff); i++) {
+		rmb();
+		msleep(1);
+	}
+
+	if (frame_hdr->cmd_status == 0xff)
+		return -ETIME;
+
+	return 0;
+}
+
+/**
+ * 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->fire_cmd(instance,
+			cmd->frame_phys_addr, 0, instance->reg_set);
+
+	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 comamnd (automatic event
+ * notification). The megasas_issue_blocked_abort_cmd() issues such abort
+ * cmd and waits for return status.
+ * Max wait time is MEGASAS_INTERNAL_CMD_WAIT_TIME secs
+ */
+static int
+megasas_issue_blocked_abort_cmd(struct megasas_instance *instance,
+				struct megasas_cmd *cmd_to_abort)
+{
+	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 = 0xFF;
+
+	instance->instancet->fire_cmd(instance,
+			cmd->frame_phys_addr, 0, instance->reg_set);
+
+	/*
+	 * 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
+ */
+static 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);
+}
+
+/**
+ * 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 *))
+{
+	u32 frame_count;
+	struct megasas_cmd *cmd;
+	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;
+	}
+
+	switch (scmd->cmnd[0]) {
+	case SYNCHRONIZE_CACHE:
+		/*
+		 * FW takes care of flush cache on its own
+		 * No need to send it down
+		 */
+		scmd->result = DID_OK << 16;
+		goto out_done;
+	default:
+		break;
+	}
+
+	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);
+	/*
+	 * Check if we have pend cmds to be completed
+	 */
+	if (poll_mode_io && atomic_read(&instance->fw_outstanding))
+		tasklet_schedule(&instance->isr_tasklet);
+
+
+	return 0;
+
+ out_return_cmd:
+	megasas_return_cmd(instance, cmd);
+ 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;
+}
+
+static 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)) {
+		writel(MFI_STOP_ADP,
+			&instance->reg_set->reserved_0[0]);
+	} else {
+		writel(MFI_STOP_ADP,
+			&instance->reg_set->inbound_doorbell);
+	}
+}
+
+/**
+ * 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
+	 */
+	if (instance->flag & MEGASAS_FW_BUSY
+		&& time_after(jiffies, instance->last_time + 5 * HZ)
+		&& atomic_read(&instance->fw_outstanding) < 17) {
+
+		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);
+	}
+}
+
+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 upto 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], %#lx\n",
+					reset_index, reset_cmd,
+					reset_cmd->scmd->cmnd[0],
+					reset_cmd->scmd->serial_number);
+
+				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 < wait_time; 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->reserved_0[0]);
+		} 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 -%ld cmd=%x retries=%x\n",
+		 scmd->serial_number, 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_cmd *cmd = (struct megasas_cmd *)scmd->SCp.ptr;
+	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 = cmd->instance;
+	if (!(instance->flag & MEGASAS_FW_BUSY)) {
+		/* FW is busy, throttle IO */
+		spin_lock_irqsave(instance->host->host_lock, flags);
+
+		instance->host->can_queue = 16;
+		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;
+
+	/*
+	 * First wait for all commands to complete
+	 */
+	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_WORK(&ev->hotplug_work, megasas_aen_polling);
+			schedule_delayed_work(
+				(struct delayed_work *)&ev->hotplug_work, 0);
+		}
+	}
+}
+
+/*
+ * 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,
+};
+
+/**
+ * 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)
+ */
+static 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;
+
+	/* 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_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:
+		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],%#lx"
+			"detected on the internal queue, issue again.\n",
+			cmd, cmd->scmd->cmnd[0], cmd->scmd->serial_number);
+
+			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)) {
+			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) {
+		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_instance *instance;
+	unsigned long flags;
+	irqreturn_t	rc;
+
+	if (atomic_read(
+		&(((struct megasas_instance *)devp)->fw_reset_no_pci_access)))
+		return IRQ_HANDLED;
+
+	instance = (struct megasas_instance *)devp;
+
+	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.
+ */
+static int
+megasas_transition_to_ready(struct megasas_instance* instance)
+{
+	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");
+			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)) {
+
+				writel(
+				  MFI_INIT_CLEAR_HANDSHAKE|MFI_INIT_HOTPLUG,
+				  &instance->reg_set->reserved_0[0]);
+			} 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)) {
+				writel(MFI_INIT_HOTPLUG,
+				&instance->reg_set->reserved_0[0]);
+			} 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)) {
+				writel(MFI_RESET_FLAGS,
+					&instance->reg_set->reserved_0[0]);
+			} 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_fw_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_fw_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;
+	}
+
+	return 0;
+}
+
+/**
+ * megasas_free_cmds -	Free all the cmds in the free cmd pool
+ * @instance:		Adapter soft state
+ */
+static 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_fw_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.
+ */
+static int megasas_alloc_cmds(struct megasas_instance *instance)
+{
+	int i;
+	int j;
+	u32 max_cmd;
+	struct megasas_cmd *cmd;
+
+	max_cmd = instance->max_fw_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;
+	}
+
+
+	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;
+}
+
+/**
+ * megasas_start_timer - Initializes a timer object
+ * @instance:		Adapter soft state
+ * @timer:		timer object to be initialized
+ * @fn:			timer function
+ * @interval:		time interval between timer function call
+ */
+static inline void
+megasas_start_timer(struct megasas_instance *instance,
+			struct timer_list *timer,
+			void *fn, unsigned long interval)
+{
+	init_timer(timer);
+	timer->expires = jiffies + interval;
+	timer->data = (unsigned long)instance;
+	timer->function = fn;
+	add_timer(timer);
+}
+
+/**
+ * megasas_io_completion_timer - Timer fn
+ * @instance_addr:	Address of adapter soft state
+ *
+ * Schedules tasklet for cmd completion
+ * if poll_mode_io is set
+ */
+static void
+megasas_io_completion_timer(unsigned long instance_addr)
+{
+	struct megasas_instance *instance =
+			(struct megasas_instance *)instance_addr;
+
+	if (atomic_read(&instance->fw_outstanding))
+		tasklet_schedule(&instance->isr_tasklet);
+
+	/* Restart timer */
+	if (poll_mode_io)
+		mod_timer(&instance->io_completion_timer,
+			jiffies + MEGASAS_COMPLETION_TIMER_INTERVAL);
+}
+
+/**
+ * megasas_init_mfi -	Initializes the FW
+ * @instance:		Adapter soft state
+ *
+ * This is the main function for initializing MFI firmware.
+ */
+static int megasas_init_mfi(struct megasas_instance *instance)
+{
+	u32 context_sz;
+	u32 reply_q_sz;
+	u32 max_sectors_1;
+	u32 max_sectors_2;
+	u32 tmp_sectors;
+	struct megasas_register_set __iomem *reg_set;
+	struct megasas_ctrl_info *ctrl_info;
+	/*
+	 * Map the message registers
+	 */
+	if ((instance->pdev->device == PCI_DEVICE_ID_LSI_SAS1078GEN2) ||
+		(instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0071SKINNY) ||
+		(instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0073SKINNY) ||
+		(instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0079GEN2)) {
+		instance->base_addr = pci_resource_start(instance->pdev, 1);
+	} else {
+		instance->base_addr = pci_resource_start(instance->pdev, 0);
+	}
+
+	if (pci_request_selected_regions(instance->pdev,
+		pci_select_bars(instance->pdev, IORESOURCE_MEM),
+		"megasas: LSI")) {
+		printk(KERN_DEBUG "megasas: IO memory region busy!\n");
+		return -EBUSY;
+	}
+
+	instance->reg_set = ioremap_nocache(instance->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_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;
+	}
+
+	/*
+	 * We expect the FW state to be READY
+	 */
+	if (megasas_transition_to_ready(instance))
+		goto fail_ready_state;
+
+	/*
+	 * 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_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;
+
+	/** 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 *
+						PAGE_SIZE / 512;
+	if (tmp_sectors && (instance->max_sectors_per_req > tmp_sectors))
+		instance->max_sectors_per_req = tmp_sectors;
+
+	kfree(ctrl_info);
+
+        /*
+	* Setup tasklet for cmd completion
+	*/
+
+	tasklet_init(&instance->isr_tasklet, megasas_complete_cmd_dpc,
+		(unsigned long)instance);
+
+	/* Initialize the cmd completion timer */
+	if (poll_mode_io)
+		megasas_start_timer(instance, &instance->io_completion_timer,
+				megasas_io_completion_timer,
+				MEGASAS_COMPLETION_TIMER_INTERVAL);
+	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:
+      fail_ready_state:
+	iounmap(instance->reg_set);
+
+      fail_ioremap:
+	pci_release_selected_regions(instance->pdev,
+		pci_select_bars(instance->pdev, IORESOURCE_MEM));
+
+	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_fw_cmds + 1);
+
+	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,
+		pci_select_bars(instance->pdev, IORESOURCE_MEM));
+}
+
+/**
+ * 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->fire_cmd(instance,
+			cmd->frame_phys_addr, 0, instance->reg_set);
+
+	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;
+	/*
+	 * 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 = 128;
+	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;
+
+	/*
+	 * 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 __devinit
+megasas_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	int rval;
+	struct Scsi_Host *host;
+	struct megasas_instance *instance;
+
+	/*
+	 * 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->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;
+	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);
+	spin_lock_init(&poll_aen_lock);
+
+	mutex_init(&instance->aen_mutex);
+
+	/*
+	 * Initialize PCI related and misc parameters
+	 */
+	instance->pdev = pdev;
+	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;
+
+	INIT_WORK(&instance->work_init, process_fw_state_change_wq);
+
+	/*
+	 * Initialize MFI Firmware
+	 */
+	if (megasas_init_mfi(instance))
+		goto fail_init_mfi;
+
+	/*
+	 * Register IRQ
+	 */
+	if (request_irq(pdev->irq, megasas_isr, IRQF_SHARED, "megasas", instance)) {
+		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++;
+
+	/*
+	 * Initiate AEN (Asynchronous Event Notification)
+	 */
+	if (megasas_start_aen(instance)) {
+		printk(KERN_DEBUG "megasas: start aen failed\n");
+		goto fail_start_aen;
+	}
+
+	/*
+	 * Register with SCSI mid-layer
+	 */
+	if (megasas_io_attach(instance))
+		goto fail_io_attach;
+
+	instance->unload = 0;
+	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);
+	free_irq(instance->pdev->irq, instance);
+
+	megasas_release_mfi(instance);
+
+      fail_irq:
+      fail_init_mfi:
+      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);
+
+	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;
+
+	instance = pci_get_drvdata(pdev);
+	host = instance->host;
+	instance->unload = 1;
+
+	if (poll_mode_io)
+		del_timer_sync(&instance->io_completion_timer);
+
+	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(
+			(struct delayed_work *)&ev->hotplug_work);
+		flush_scheduled_work();
+		instance->ev = NULL;
+	}
+
+	tasklet_kill(&instance->isr_tasklet);
+
+	pci_set_drvdata(instance->pdev, instance);
+	instance->instancet->disable_intr(instance->reg_set);
+	free_irq(instance->pdev->irq, instance);
+
+	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;
+	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
+	 */
+
+	*instance->producer = 0;
+	*instance->consumer = 0;
+
+	atomic_set(&instance->fw_outstanding, 0);
+
+	/*
+	 * We expect the FW state to be READY
+	 */
+	if (megasas_transition_to_ready(instance))
+		goto fail_ready_state;
+
+	if (megasas_issue_init_mfi(instance))
+		goto fail_init_mfi;
+
+	tasklet_init(&instance->isr_tasklet, megasas_complete_cmd_dpc,
+			(unsigned long)instance);
+
+	/*
+	 * Register IRQ
+	 */
+	if (request_irq(pdev->irq, megasas_isr, IRQF_SHARED,
+		"megasas", instance)) {
+		printk(KERN_ERR "megasas: Failed to register IRQ\n");
+		goto fail_irq;
+	}
+
+	instance->instancet->enable_intr(instance->reg_set);
+
+	/*
+	 * Initiate AEN (Asynchronous Event Notification)
+	 */
+	if (megasas_start_aen(instance))
+		printk(KERN_ERR "megasas: Start AEN failed\n");
+
+	/* Initialize the cmd completion timer */
+	if (poll_mode_io)
+		megasas_start_timer(instance, &instance->io_completion_timer,
+				megasas_io_completion_timer,
+				MEGASAS_COMPLETION_TIMER_INTERVAL);
+	instance->unload = 0;
+
+	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 __devexit megasas_detach_one(struct pci_dev *pdev)
+{
+	int i;
+	struct Scsi_Host *host;
+	struct megasas_instance *instance;
+
+	instance = pci_get_drvdata(pdev);
+	instance->unload = 1;
+	host = instance->host;
+
+	if (poll_mode_io)
+		del_timer_sync(&instance->io_completion_timer);
+
+	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(
+			(struct delayed_work *)&ev->hotplug_work);
+		flush_scheduled_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);
+
+	free_irq(instance->pdev->irq, instance);
+
+	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);
+
+	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)
+{
+	struct megasas_instance *instance = pci_get_drvdata(pdev);
+	instance->unload = 1;
+	megasas_flush_cache(instance);
+	megasas_shutdown_controller(instance, MR_DCMD_CTRL_SHUTDOWN);
+}
+
+/**
+ * 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;
+
+	/*
+	 * 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++) {
+		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 && kbuff_arr[i]; 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_kfree_ioc;
+	}
+	spin_unlock_irqrestore(&instance->hba_lock, flags);
+
+	error = megasas_mgmt_fw_ioctl(instance, user_ioc, ioc);
+	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;
+
+	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 (ioc->sense_len) {
+		void __user **sense_ioc_ptr =
+			(void __user **)(ioc->frame.raw + ioc->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 = __devexit_p(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 ssize_t
+megasas_sysfs_show_poll_mode_io(struct device_driver *dd, char *buf)
+{
+	return sprintf(buf, "%u\n", poll_mode_io);
+}
+
+static ssize_t
+megasas_sysfs_set_poll_mode_io(struct device_driver *dd,
+				const char *buf, size_t count)
+{
+	int retval = count;
+	int tmp = poll_mode_io;
+	int i;
+	struct megasas_instance *instance;
+
+	if (sscanf(buf, "%u", &poll_mode_io) < 1) {
+		printk(KERN_ERR "megasas: could not set poll_mode_io\n");
+		retval = -EINVAL;
+	}
+
+	/*
+	 * Check if poll_mode_io is already set or is same as previous value
+	 */
+	if ((tmp && poll_mode_io) || (tmp == poll_mode_io))
+		goto out;
+
+	if (poll_mode_io) {
+		/*
+		 * Start timers for all adapters
+		 */
+		for (i = 0; i < megasas_mgmt_info.max_index; i++) {
+			instance = megasas_mgmt_info.instance[i];
+			if (instance) {
+				megasas_start_timer(instance,
+					&instance->io_completion_timer,
+					megasas_io_completion_timer,
+					MEGASAS_COMPLETION_TIMER_INTERVAL);
+			}
+		}
+	} else {
+		/*
+		 * Delete timers for all adapters
+		 */
+		for (i = 0; i < megasas_mgmt_info.max_index; i++) {
+			instance = megasas_mgmt_info.instance[i];
+			if (instance)
+				del_timer_sync(&instance->io_completion_timer);
+		}
+	}
+
+out:
+	return retval;
+}
+
+static void
+megasas_aen_polling(struct work_struct *work)
+{
+	struct megasas_aen_event *ev =
+		container_of(work, struct megasas_aen_event, hotplug_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) {
+			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_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_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:
+			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);
+}
+
+
+static DRIVER_ATTR(poll_mode_io, S_IRUGO|S_IWUSR,
+		megasas_sysfs_show_poll_mode_io,
+		megasas_sysfs_set_poll_mode_io);
+
+/**
+ * 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);
+
+	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_poll_mode_io);
+	if (rval)
+		goto err_dcf_poll_mode_io;
+
+	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_poll_mode_io);
+
+err_dcf_poll_mode_io:
+	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_poll_mode_io);
+	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);