[SCSI] MegaRAID SAS RAID: new driver

Signed-off-by: Sreenivas Bagalkote <Sreenivas.Bagalkote@lsil.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

5 files changed, 3958 insertions, 0 deletions

diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
index 1e4edbdf2730..48529d180ca8 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -99,6 +99,7 @@ obj-$(CONFIG_SCSI_DC395x)	+= dc395x.o
 obj-$(CONFIG_SCSI_DC390T)       += tmscsim.o
 obj-$(CONFIG_MEGARAID_LEGACY)   += megaraid.o
 obj-$(CONFIG_MEGARAID_NEWGEN)   += megaraid/
+obj-$(CONFIG_MEGARAID_SAS)      += megaraid/
 obj-$(CONFIG_SCSI_ACARD)        += atp870u.o
 obj-$(CONFIG_SCSI_SUNESP)       += esp.o
 obj-$(CONFIG_SCSI_GDTH)         += gdth.o
diff --git a/drivers/scsi/megaraid/Kconfig.megaraid b/drivers/scsi/megaraid/Kconfig.megaraid
index 917d591d90b2..7363e12663ac 100644
--- a/drivers/scsi/megaraid/Kconfig.megaraid
+++ b/drivers/scsi/megaraid/Kconfig.megaraid
@@ -76,3 +76,12 @@ config MEGARAID_LEGACY
         To compile this driver as a module, choose M here: the
         module will be called megaraid
 endif
+
+config MEGARAID_SAS
+        tristate "LSI Logic MegaRAID SAS RAID Module"
+        depends on PCI && SCSI
+        help
+        Module for LSI Logic's SAS based RAID controllers.
+        To compile this driver as a module, choose 'm' here.
+        Module will be called megaraid_sas
+
diff --git a/drivers/scsi/megaraid/Makefile b/drivers/scsi/megaraid/Makefile
index 6dd99f275722..f469915b97c3 100644
--- a/drivers/scsi/megaraid/Makefile
+++ b/drivers/scsi/megaraid/Makefile
@@ -1,2 +1,3 @@
 obj-$(CONFIG_MEGARAID_MM)       += megaraid_mm.o
 obj-$(CONFIG_MEGARAID_MAILBOX)  += megaraid_mbox.o
+obj-$(CONFIG_MEGARAID_SAS)      += megaraid_sas.o
diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c
new file mode 100644
index 000000000000..1b3148e842af
--- /dev/null
+++ b/drivers/scsi/megaraid/megaraid_sas.c
@@ -0,0 +1,2805 @@
+/*
+ *
+ *              Linux MegaRAID driver for SAS based RAID controllers
+ *
+ * Copyright (c) 2003-2005  LSI Logic 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      : v00.00.02.00-rc4
+ *
+ * Authors:
+ *      Sreenivas Bagalkote     <Sreenivas.Bagalkote@lsil.com>
+ *      Sumant Patro            <Sumant.Patro@lsil.com>
+ *
+ * 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/version.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 <asm/uaccess.h>
+#include <linux/compat.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_host.h>
+#include "megaraid_sas.h"
+
+MODULE_LICENSE("GPL");
+MODULE_VERSION(MEGASAS_VERSION);
+MODULE_AUTHOR("sreenivas.bagalkote@lsil.com");
+MODULE_DESCRIPTION("LSI Logic MegaRAID SAS Driver");
+
+/*
+ * PCI ID table for all supported controllers
+ */
+static struct pci_device_id megasas_pci_table[] = {
+
+        {
+         PCI_VENDOR_ID_LSI_LOGIC,
+         PCI_DEVICE_ID_LSI_SAS1064R,
+         PCI_ANY_ID,
+         PCI_ANY_ID,
+         },
+        {
+         PCI_VENDOR_ID_DELL,
+         PCI_DEVICE_ID_DELL_PERC5,
+         PCI_ANY_ID,
+         PCI_ANY_ID,
+         },
+        {0}                     /* Terminating entry */
+};
+
+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 DECLARE_MUTEX(megasas_async_queue_mutex);
+
+/**
+ * megasas_get_cmd -    Get a command from the free pool
+ * @instance:           Adapter soft state
+ *
+ * Returns a free command from the pool
+ */
+static inline 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);
+}
+
+/**
+ * megasas_enable_intr -        Enables interrupts
+ * @regs:                       MFI register set
+ */
+static inline void
+megasas_enable_intr(struct megasas_register_set __iomem * regs)
+{
+        writel(1, &(regs)->outbound_intr_mask);
+
+        /* Dummy readl to force pci flush */
+        readl(&regs->outbound_intr_mask);
+}
+
+/**
+ * megasas_disable_intr -       Disables interrupts
+ * @regs:                       MFI register set
+ */
+static inline void
+megasas_disable_intr(struct megasas_register_set __iomem * regs)
+{
+        u32 mask = readl(&regs->outbound_intr_mask) & (~0x00000001);
+        writel(mask, &regs->outbound_intr_mask);
+
+        /* Dummy readl to force pci flush */
+        readl(&regs->outbound_intr_mask);
+}
+
+/**
+ * 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
+         */
+        writel(cmd->frame_phys_addr >> 3,
+               &instance->reg_set->inbound_queue_port);
+
+        /*
+         * 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.
+ * Used to issue ioctl commands.
+ */
+static int
+megasas_issue_blocked_cmd(struct megasas_instance *instance,
+                          struct megasas_cmd *cmd)
+{
+        cmd->cmd_status = ENODATA;
+
+        writel(cmd->frame_phys_addr >> 3,
+               &instance->reg_set->inbound_queue_port);
+
+        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 blocks till it is completed.
+ */
+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;
+
+        writel(cmd->frame_phys_addr >> 3,
+               &instance->reg_set->inbound_queue_port);
+
+        /*
+         * Wait for this cmd to complete
+         */
+        wait_event(instance->abort_cmd_wait_q, (cmd->cmd_status != 0xFF));
+
+        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 inline 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;
+
+        /*
+         * Return 0 if there is no data transfer
+         */
+        if (!scp->request_buffer || !scp->request_bufflen)
+                return 0;
+
+        if (!scp->use_sg) {
+                mfi_sgl->sge32[0].phys_addr = pci_map_single(instance->pdev,
+                                                             scp->
+                                                             request_buffer,
+                                                             scp->
+                                                             request_bufflen,
+                                                             scp->
+                                                             sc_data_direction);
+                mfi_sgl->sge32[0].length = scp->request_bufflen;
+
+                return 1;
+        }
+
+        os_sgl = (struct scatterlist *)scp->request_buffer;
+        sge_count = pci_map_sg(instance->pdev, os_sgl, scp->use_sg,
+                               scp->sc_data_direction);
+
+        for (i = 0; i < sge_count; i++, os_sgl++) {
+                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 inline 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;
+
+        /*
+         * Return 0 if there is no data transfer
+         */
+        if (!scp->request_buffer || !scp->request_bufflen)
+                return 0;
+
+        if (!scp->use_sg) {
+                mfi_sgl->sge64[0].phys_addr = pci_map_single(instance->pdev,
+                                                             scp->
+                                                             request_buffer,
+                                                             scp->
+                                                             request_bufflen,
+                                                             scp->
+                                                             sc_data_direction);
+
+                mfi_sgl->sge64[0].length = scp->request_bufflen;
+
+                return 1;
+        }
+
+        os_sgl = (struct scatterlist *)scp->request_buffer;
+        sge_count = pci_map_sg(instance->pdev, os_sgl, scp->use_sg,
+                               scp->sc_data_direction);
+
+        for (i = 0; i < sge_count; i++, os_sgl++) {
+                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_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 inline int
+megasas_build_dcdb(struct megasas_instance *instance, struct scsi_cmnd *scp,
+                   struct megasas_cmd *cmd)
+{
+        u32 sge_sz;
+        int sge_bytes;
+        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;
+
+        /*
+         * 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->flags = flags;
+        pthru->data_xfer_len = scp->request_bufflen;
+
+        memcpy(pthru->cdb, scp->cmnd, scp->cmd_len);
+
+        /*
+         * Construct SGL
+         */
+        sge_sz = (IS_DMA64) ? sizeof(struct megasas_sge64) :
+            sizeof(struct megasas_sge32);
+
+        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);
+
+        /*
+         * 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;
+
+        sge_bytes = sge_sz * pthru->sge_count;
+
+        /*
+         * 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 = (sge_bytes / MEGAMFI_FRAME_SIZE) +
+            ((sge_bytes % MEGAMFI_FRAME_SIZE) ? 1 : 0) + 1;
+
+        if (cmd->frame_count > 7)
+                cmd->frame_count = 8;
+
+        return cmd->frame_count;
+}
+
+/**
+ * megasas_build_ldio - Prepares IOs to logical devices
+ * @instance:           Adapter soft state
+ * @scp:                SCSI command
+ * @cmd:                Command to to be prepared
+ *
+ * Frames (and accompanying SGLs) for regular SCSI IOs use this function.
+ */
+static inline int
+megasas_build_ldio(struct megasas_instance *instance, struct scsi_cmnd *scp,
+                   struct megasas_cmd *cmd)
+{
+        u32 sge_sz;
+        int sge_bytes;
+        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;
+
+        /*
+         * Preare 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
+         */
+        sge_sz = (IS_DMA64) ? sizeof(struct megasas_sge64) :
+            sizeof(struct megasas_sge32);
+
+        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);
+
+        /*
+         * 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;
+
+        sge_bytes = sge_sz * ldio->sge_count;
+
+        cmd->frame_count = (sge_bytes / MEGAMFI_FRAME_SIZE) +
+            ((sge_bytes % MEGAMFI_FRAME_SIZE) ? 1 : 0) + 1;
+
+        if (cmd->frame_count > 7)
+                cmd->frame_count = 8;
+
+        return cmd->frame_count;
+}
+
+/**
+ * megasas_build_cmd -  Prepares a command packet
+ * @instance:           Adapter soft state
+ * @scp:                SCSI command
+ * @frame_count:        [OUT] Number of frames used to prepare this command
+ */
+static inline struct megasas_cmd *megasas_build_cmd(struct megasas_instance
+                                                    *instance,
+                                                    struct scsi_cmnd *scp,
+                                                    int *frame_count)
+{
+        u32 logical_cmd;
+        struct megasas_cmd *cmd;
+
+        /*
+         * Find out if this is logical or physical drive command.
+         */
+        logical_cmd = MEGASAS_IS_LOGICAL(scp);
+
+        /*
+         * Logical drive command
+         */
+        if (logical_cmd) {
+
+                if (scp->device->id >= MEGASAS_MAX_LD) {
+                        scp->result = DID_BAD_TARGET << 16;
+                        return NULL;
+                }
+
+                switch (scp->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:
+                        /*
+                         * Fail for LUN > 0
+                         */
+                        if (scp->device->lun) {
+                                scp->result = DID_BAD_TARGET << 16;
+                                return NULL;
+                        }
+
+                        cmd = megasas_get_cmd(instance);
+
+                        if (!cmd) {
+                                scp->result = DID_IMM_RETRY << 16;
+                                return NULL;
+                        }
+
+                        *frame_count = megasas_build_ldio(instance, scp, cmd);
+
+                        if (!(*frame_count)) {
+                                megasas_return_cmd(instance, cmd);
+                                return NULL;
+                        }
+
+                        return cmd;
+
+                default:
+                        /*
+                         * Fail for LUN > 0
+                         */
+                        if (scp->device->lun) {
+                                scp->result = DID_BAD_TARGET << 16;
+                                return NULL;
+                        }
+
+                        cmd = megasas_get_cmd(instance);
+
+                        if (!cmd) {
+                                scp->result = DID_IMM_RETRY << 16;
+                                return NULL;
+                        }
+
+                        *frame_count = megasas_build_dcdb(instance, scp, cmd);
+
+                        if (!(*frame_count)) {
+                                megasas_return_cmd(instance, cmd);
+                                return NULL;
+                        }
+
+                        return cmd;
+                }
+        } else {
+                cmd = megasas_get_cmd(instance);
+
+                if (!cmd) {
+                        scp->result = DID_IMM_RETRY << 16;
+                        return NULL;
+                }
+
+                *frame_count = megasas_build_dcdb(instance, scp, cmd);
+
+                if (!(*frame_count)) {
+                        megasas_return_cmd(instance, cmd);
+                        return NULL;
+                }
+
+                return cmd;
+        }
+
+        return NULL;
+}
+
+/**
+ * megasas_queue_command -      Queue entry point
+ * @scmd:                       SCSI command to be queued
+ * @done:                       Callback entry point
+ */
+static int
+megasas_queue_command(struct scsi_cmnd *scmd, void (*done) (struct scsi_cmnd *))
+{
+        u32 frame_count;
+        unsigned long flags;
+        struct megasas_cmd *cmd;
+        struct megasas_instance *instance;
+
+        instance = (struct megasas_instance *)
+            scmd->device->host->hostdata;
+        scmd->scsi_done = done;
+        scmd->result = 0;
+
+        cmd = megasas_build_cmd(instance, scmd, &frame_count);
+
+        if (!cmd) {
+                done(scmd);
+                return 0;
+        }
+
+        cmd->scmd = scmd;
+        scmd->SCp.ptr = (char *)cmd;
+        scmd->SCp.sent_command = jiffies;
+
+        /*
+         * Issue the command to the FW
+         */
+        spin_lock_irqsave(&instance->instance_lock, flags);
+        instance->fw_outstanding++;
+        spin_unlock_irqrestore(&instance->instance_lock, flags);
+
+        writel(((cmd->frame_phys_addr >> 3) | (cmd->frame_count - 1)),
+               &instance->reg_set->inbound_queue_port);
+
+        return 0;
+}
+
+/**
+ * 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 wait_time = MEGASAS_RESET_WAIT_TIME;
+
+        for (i = 0; i < wait_time; i++) {
+
+                if (!instance->fw_outstanding)
+                        break;
+
+                if (!(i % MEGASAS_RESET_NOTICE_INTERVAL)) {
+                        printk(KERN_NOTICE "megasas: [%2d]waiting for %d "
+                               "commands to complete\n", i,
+                               instance->fw_outstanding);
+                }
+
+                msleep(1000);
+        }
+
+        if (instance->fw_outstanding) {
+                instance->hw_crit_error = 1;
+                return FAILED;
+        }
+
+        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;
+
+        printk(KERN_NOTICE "megasas: RESET -%ld cmd=%x <c=%d t=%d l=%d>\n",
+               scmd->serial_number, scmd->cmnd[0], scmd->device->channel,
+               scmd->device->id, scmd->device->lun);
+
+        if (instance->hw_crit_error) {
+                printk(KERN_ERR "megasas: cannot recover from previous reset "
+                       "failures\n");
+                return FAILED;
+        }
+
+        spin_unlock(scmd->device->host->host_lock);
+
+        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");
+
+        spin_lock(scmd->device->host->host_lock);
+
+        return ret_val;
+}
+
+static enum scsi_eh_timer_return megasas_reset_timer(struct scsi_cmnd *scmd)
+{
+        unsigned long seconds;
+
+        if (scmd->SCp.ptr) {
+                seconds = (jiffies - scmd->SCp.sent_command) / HZ;
+
+                if (seconds < 90) {
+                        return EH_RESET_TIMER;
+                } else {
+                        return EH_NOT_HANDLED;
+                }
+        }
+
+        return EH_HANDLED;
+}
+
+/**
+ * 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;
+
+        /*
+         * Frist wait for all commands to complete
+         */
+        ret = megasas_generic_reset(scmd);
+
+        return ret;
+}
+
+/**
+ * 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)
+{
+        /*
+         * Don't signal app if it is just an aborted previously registered aen
+         */
+        if (!cmd->abort_aen)
+                kill_fasync(&megasas_async_queue, SIGIO, POLL_IN);
+        else
+                cmd->abort_aen = 0;
+
+        instance->aen_cmd = NULL;
+        megasas_return_cmd(instance, cmd);
+}
+
+/*
+ * Scsi host template for megaraid_sas driver
+ */
+static struct scsi_host_template megasas_template = {
+
+        .module = THIS_MODULE,
+        .name = "LSI Logic SAS based MegaRAID driver",
+        .proc_name = "megaraid_sas",
+        .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,
+        .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_unmap_sgbuf -        Unmap SG buffers
+ * @instance:                   Adapter soft state
+ * @cmd:                        Completed command
+ */
+static inline void
+megasas_unmap_sgbuf(struct megasas_instance *instance, struct megasas_cmd *cmd)
+{
+        dma_addr_t buf_h;
+        u8 opcode;
+
+        if (cmd->scmd->use_sg) {
+                pci_unmap_sg(instance->pdev, cmd->scmd->request_buffer,
+                             cmd->scmd->use_sg, cmd->scmd->sc_data_direction);
+                return;
+        }
+
+        if (!cmd->scmd->request_bufflen)
+                return;
+
+        opcode = cmd->frame->hdr.cmd;
+
+        if ((opcode == MFI_CMD_LD_READ) || (opcode == MFI_CMD_LD_WRITE)) {
+                if (IS_DMA64)
+                        buf_h = cmd->frame->io.sgl.sge64[0].phys_addr;
+                else
+                        buf_h = cmd->frame->io.sgl.sge32[0].phys_addr;
+        } else {
+                if (IS_DMA64)
+                        buf_h = cmd->frame->pthru.sgl.sge64[0].phys_addr;
+                else
+                        buf_h = cmd->frame->pthru.sgl.sge32[0].phys_addr;
+        }
+
+        pci_unmap_single(instance->pdev, buf_h, cmd->scmd->request_bufflen,
+                         cmd->scmd->sc_data_direction);
+        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 inline 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;
+
+        if (cmd->scmd) {
+                cmd->scmd->SCp.ptr = (char *)0;
+        }
+
+        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;
+                }
+
+                /*
+                 * Don't export physical disk devices to mid-layer.
+                 */
+                if (!MEGASAS_IS_LOGICAL(cmd->scmd) &&
+                    (hdr->cmd_status == MFI_STAT_OK) &&
+                    (cmd->scmd->cmnd[0] == INQUIRY)) {
+
+                        if (((*(u8 *) cmd->scmd->request_buffer) & 0x1F) ==
+                            TYPE_DISK) {
+                                cmd->scmd->result = DID_BAD_TARGET << 16;
+                                exception = 1;
+                        }
+                }
+
+        case MFI_CMD_LD_READ:
+        case MFI_CMD_LD_WRITE:
+
+                if (alt_status) {
+                        cmd->scmd->result = alt_status << 16;
+                        exception = 1;
+                }
+
+                if (exception) {
+
+                        spin_lock_irqsave(&instance->instance_lock, flags);
+                        instance->fw_outstanding--;
+                        spin_unlock_irqrestore(&instance->instance_lock, flags);
+
+                        megasas_unmap_sgbuf(instance, cmd);
+                        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;
+                }
+
+                spin_lock_irqsave(&instance->instance_lock, flags);
+                instance->fw_outstanding--;
+                spin_unlock_irqrestore(&instance->instance_lock, flags);
+
+                megasas_unmap_sgbuf(instance, cmd);
+                cmd->scmd->scsi_done(cmd->scmd);
+                megasas_return_cmd(instance, cmd);
+
+                break;
+
+        case MFI_CMD_SMP:
+        case MFI_CMD_STP:
+        case MFI_CMD_DCMD:
+
+                /*
+                 * 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_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
+ */
+static inline int
+megasas_deplete_reply_queue(struct megasas_instance *instance, u8 alt_status)
+{
+        u32 status;
+        u32 producer;
+        u32 consumer;
+        u32 context;
+        struct megasas_cmd *cmd;
+
+        /*
+         * Check if it is our interrupt
+         */
+        status = readl(&instance->reg_set->outbound_intr_status);
+
+        if (!(status & MFI_OB_INTR_STATUS_MASK)) {
+                return IRQ_NONE;
+        }
+
+        /*
+         * Clear the interrupt by writing back the same value
+         */
+        writel(status, &instance->reg_set->outbound_intr_status);
+
+        producer = *instance->producer;
+        consumer = *instance->consumer;
+
+        while (consumer != producer) {
+                context = instance->reply_queue[consumer];
+
+                cmd = instance->cmd_list[context];
+
+                megasas_complete_cmd(instance, cmd, alt_status);
+
+                consumer++;
+                if (consumer == (instance->max_fw_cmds + 1)) {
+                        consumer = 0;
+                }
+        }
+
+        *instance->consumer = producer;
+
+        return IRQ_HANDLED;
+}
+
+/**
+ * megasas_isr - isr entry point
+ */
+static irqreturn_t megasas_isr(int irq, void *devp, struct pt_regs *regs)
+{
+        return megasas_deplete_reply_queue((struct megasas_instance *)devp,
+                                           DID_OK);
+}
+
+/**
+ * megasas_transition_to_ready -        Move the FW to READY state
+ * @reg_set:                            MFI register set
+ *
+ * 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_register_set __iomem * reg_set)
+{
+        int i;
+        u8 max_wait;
+        u32 fw_state;
+        u32 cur_state;
+
+        fw_state = readl(&reg_set->outbound_msg_0) & MFI_STATE_MASK;
+
+        while (fw_state != MFI_STATE_READY) {
+
+                printk(KERN_INFO "megasas: Waiting for FW to come to ready"
+                       " state\n");
+                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
+                         */
+                        writel(MFI_INIT_CLEAR_HANDSHAKE,
+                               &reg_set->inbound_doorbell);
+
+                        max_wait = 2;
+                        cur_state = MFI_STATE_WAIT_HANDSHAKE;
+                        break;
+
+                case MFI_STATE_OPERATIONAL:
+                        /*
+                         * Bring it to READY state; assuming max wait 2 secs
+                         */
+                        megasas_disable_intr(reg_set);
+                        writel(MFI_INIT_READY, &reg_set->inbound_doorbell);
+
+                        max_wait = 10;
+                        cur_state = MFI_STATE_OPERATIONAL;
+                        break;
+
+                case MFI_STATE_UNDEFINED:
+                        /*
+                         * This state should not last for more than 2 seconds
+                         */
+                        max_wait = 2;
+                        cur_state = MFI_STATE_UNDEFINED;
+                        break;
+
+                case MFI_STATE_BB_INIT:
+                        max_wait = 2;
+                        cur_state = MFI_STATE_BB_INIT;
+                        break;
+
+                case MFI_STATE_FW_INIT:
+                        max_wait = 20;
+                        cur_state = MFI_STATE_FW_INIT;
+                        break;
+
+                case MFI_STATE_FW_INIT_2:
+                        max_wait = 20;
+                        cur_state = MFI_STATE_FW_INIT_2;
+                        break;
+
+                case MFI_STATE_DEVICE_SCAN:
+                        max_wait = 20;
+                        cur_state = MFI_STATE_DEVICE_SCAN;
+                        break;
+
+                case MFI_STATE_FLUSH_CACHE:
+                        max_wait = 20;
+                        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 = MFI_STATE_MASK &
+                            readl(&reg_set->outbound_msg_0);
+
+                        if (fw_state == cur_state) {
+                                msleep(1);
+                        } else
+                                break;
+                }
+
+                /*
+                 * Return error if fw_state hasn't changed after max_wait
+                 */
+                if (fw_state == cur_state) {
+                        printk(KERN_DEBUG "FW state [%d] hasn't changed "
+                               "in %d secs\n", fw_state, max_wait);
+                        return -ENODEV;
+                }
+        };
+
+        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->frame,
+                                      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);
+
+        /*
+         * 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;
+
+        /*
+         * 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;
+                }
+
+                cmd->frame->io.context = cmd->index;
+        }
+
+        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 = kmalloc(sizeof(struct megasas_cmd *) * max_cmd,
+                                     GFP_KERNEL);
+
+        if (!instance->cmd_list) {
+                printk(KERN_DEBUG "megasas: out of memory\n");
+                return -ENOMEM;
+        }
+
+        memset(instance->cmd_list, 0, sizeof(struct megasas_cmd *) * max_cmd);
+
+        for (i = 0; i < max_cmd; i++) {
+                instance->cmd_list[i] = kmalloc(sizeof(struct megasas_cmd),
+                                                GFP_KERNEL);
+
+                if (!instance->cmd_list[i]) {
+
+                        for (j = 0; j < i; j++)
+                                kfree(instance->cmd_list[j]);
+
+                        kfree(instance->cmd_list);
+                        instance->cmd_list = NULL;
+
+                        return -ENOMEM;
+                }
+        }
+
+        /*
+         * Add all the commands to command pool (instance->cmd_pool)
+         */
+        for (i = 0; i < max_cmd; i++) {
+                cmd = instance->cmd_list[i];
+                memset(cmd, 0, sizeof(struct megasas_cmd));
+                cmd->index = i;
+                cmd->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_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->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_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;
+        struct megasas_register_set __iomem *reg_set;
+
+        struct megasas_cmd *cmd;
+        struct megasas_ctrl_info *ctrl_info;
+
+        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;
+
+        /*
+         * Map the message registers
+         */
+        instance->base_addr = pci_resource_start(instance->pdev, 0);
+
+        if (pci_request_regions(instance->pdev, "megasas: LSI Logic")) {
+                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;
+
+        /*
+         * We expect the FW state to be READY
+         */
+        if (megasas_transition_to_ready(instance->reg_set))
+                goto fail_ready_state;
+
+        /*
+         * Get various operational parameters from status register
+         */
+        instance->max_fw_cmds = readl(&reg_set->outbound_msg_0) & 0x00FFFF;
+        instance->max_num_sge = (readl(&reg_set->outbound_msg_0) & 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;
+        }
+
+        /*
+         * 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;
+
+        memset(init_frame, 0, MEGAMFI_FRAME_SIZE);
+        memset(initq_info, 0, sizeof(struct megasas_init_queue_info));
+
+        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);
+
+        /*
+         * Issue the init frame in polled mode
+         */
+        if (megasas_issue_polled(instance, cmd)) {
+                printk(KERN_DEBUG "megasas: Failed to init firmware\n");
+                goto fail_fw_init;
+        }
+
+        megasas_return_cmd(instance, cmd);
+
+        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.
+         */
+        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;
+
+                instance->max_sectors_per_req = (max_sectors_1 < max_sectors_2)
+                    ? max_sectors_1 : max_sectors_2;
+        } else
+                instance->max_sectors_per_req = instance->max_num_sge *
+                    PAGE_SIZE / 512;
+
+        kfree(ctrl_info);
+
+        return 0;
+
+      fail_fw_init:
+        megasas_return_cmd(instance, cmd);
+
+        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_regions(instance->pdev);
+
+        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_regions(instance->pdev);
+}
+
+/**
+ * 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->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->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);
+
+        /*
+         * 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
+         */
+        writel(cmd->frame_phys_addr >> 3,
+               &instance->reg_set->inbound_queue_port);
+
+        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;
+        host->can_queue = instance->max_fw_cmds - MEGASAS_INT_CMDS;
+        host->this_id = instance->init_id;
+        host->sg_tablesize = instance->max_num_sge;
+        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;
+
+        /*
+         * 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;
+}
+
+/**
+ * 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(pdev);
+
+        if (rval) {
+                return rval;
+        }
+
+        pci_set_master(pdev);
+
+        /*
+         * All our contollers are capable of performing 64-bit DMA
+         */
+        if (IS_DMA64) {
+                if (pci_set_dma_mask(pdev, DMA_64BIT_MASK) != 0) {
+
+                        if (pci_set_dma_mask(pdev, DMA_32BIT_MASK) != 0)
+                                goto fail_set_dma_mask;
+                }
+        } else {
+                if (pci_set_dma_mask(pdev, DMA_32BIT_MASK) != 0)
+                        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));
+
+        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;
+
+        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_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->instance_lock);
+
+        sema_init(&instance->aen_mutex, 1);
+        sema_init(&instance->ioctl_sem, MEGASAS_INT_CMDS);
+
+        /*
+         * 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;
+
+        /*
+         * Initialize MFI Firmware
+         */
+        if (megasas_init_mfi(instance))
+                goto fail_init_mfi;
+
+        /*
+         * Register IRQ
+         */
+        if (request_irq(pdev->irq, megasas_isr, SA_SHIRQ, "megasas", instance)) {
+                printk(KERN_DEBUG "megasas: Failed to register IRQ\n");
+                goto fail_irq;
+        }
+
+        megasas_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;
+
+        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);
+        megasas_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;
+
+        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->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
+ */
+static void megasas_shutdown_controller(struct megasas_instance *instance)
+{
+        struct megasas_cmd *cmd;
+        struct megasas_dcmd_frame *dcmd;
+
+        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->data_xfer_len = 0;
+        dcmd->opcode = MR_DCMD_CTRL_SHUTDOWN;
+
+        megasas_issue_blocked_cmd(instance, cmd);
+
+        megasas_return_cmd(instance, cmd);
+
+        return;
+}
+
+/**
+ * megasas_detach_one - PCI hot"un"plug entry point
+ * @pdev:               PCI device structure
+ */
+static void megasas_detach_one(struct pci_dev *pdev)
+{
+        int i;
+        struct Scsi_Host *host;
+        struct megasas_instance *instance;
+
+        instance = pci_get_drvdata(pdev);
+        host = instance->host;
+
+        scsi_remove_host(instance->host);
+        megasas_flush_cache(instance);
+        megasas_shutdown_controller(instance);
+
+        /*
+         * 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);
+
+        megasas_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);
+        megasas_flush_cache(instance);
+}
+
+/**
+ * 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_release - char node "release" entry point
+ */
+static int megasas_mgmt_release(struct inode *inode, struct file *filep)
+{
+        filep->private_data = NULL;
+        fasync_helper(-1, filep, 0, &megasas_async_queue);
+
+        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;
+
+        down(&megasas_async_queue_mutex);
+
+        rc = fasync_helper(fd, filep, mode, &megasas_async_queue);
+
+        up(&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_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;
+        u32 *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;
+
+        /*
+         * 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] = pci_alloc_consistent(instance->pdev,
+                                                    ioc->sgl[i].iov_len,
+                                                    &buf_handle);
+                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 = pci_alloc_consistent(instance->pdev, ioc->sense_len,
+                                             &sense_handle);
+                if (!sense) {
+                        error = -ENOMEM;
+                        goto out;
+                }
+
+                sense_ptr =
+                    (u32 *) ((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 = (u32 *) ((unsigned long)ioc->frame.raw +
+                                     ioc->sense_off);
+
+                if (copy_to_user((void __user *)((unsigned long)(*sense_ptr)),
+                                 sense, ioc->sense_len)) {
+                        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) {
+                pci_free_consistent(instance->pdev, ioc->sense_len,
+                                    sense, sense_handle);
+        }
+
+        for (i = 0; i < ioc->sge_count && kbuff_arr[i]; i++) {
+                pci_free_consistent(instance->pdev,
+                                    kern_sge32[i].length,
+                                    kbuff_arr[i], kern_sge32[i].phys_addr);
+        }
+
+        megasas_return_cmd(instance, cmd);
+        return error;
+}
+
+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_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;
+
+        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;
+        }
+
+        /*
+         * We will allow only MEGASAS_INT_CMDS number of parallel ioctl cmds
+         */
+        if (down_interruptible(&instance->ioctl_sem)) {
+                error = -ERESTARTSYS;
+                goto out_kfree_ioc;
+        }
+        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;
+
+        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;
+
+        down(&instance->aen_mutex);
+        error = megasas_register_aen(instance, aen.seq_num,
+                                     aen.class_locale_word);
+        up(&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;
+
+        clear_user(ioc, sizeof(*ioc));
+
+        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;
+
+        for (i = 0; i < MAX_IOCTL_SGE; i++) {
+                compat_uptr_t ptr;
+
+                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_FIRMWARE:{
+                        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 struct file_operations megasas_mgmt_fops = {
+        .owner = THIS_MODULE,
+        .open = megasas_mgmt_open,
+        .release = megasas_mgmt_release,
+        .fasync = megasas_mgmt_fasync,
+        .unlocked_ioctl = megasas_mgmt_ioctl,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl = megasas_mgmt_compat_ioctl,
+#endif
+};
+
+/*
+ * 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),
+        .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);
+
+/**
+ * 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);
+
+        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_module_init(&megasas_pci_driver);
+
+        if (rval) {
+                printk(KERN_DEBUG "megasas: PCI hotplug regisration failed \n");
+                unregister_chrdev(megasas_mgmt_majorno, "megaraid_sas_ioctl");
+        }
+
+        driver_create_file(&megasas_pci_driver.driver, &driver_attr_version);
+        driver_create_file(&megasas_pci_driver.driver,
+                           &driver_attr_release_date);
+
+        return rval;
+}
+
+/**
+ * megasas_exit - Driver unload entry point
+ */
+static void __exit megasas_exit(void)
+{
+        driver_remove_file(&megasas_pci_driver.driver, &driver_attr_version);
+        driver_remove_file(&megasas_pci_driver.driver,
+                           &driver_attr_release_date);
+
+        pci_unregister_driver(&megasas_pci_driver);
+        unregister_chrdev(megasas_mgmt_majorno, "megaraid_sas_ioctl");
+}
+
+module_init(megasas_init);
+module_exit(megasas_exit);
diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
new file mode 100644
index 000000000000..eaec9d531424
--- /dev/null
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -0,0 +1,1142 @@
+/*
+ *
+ *              Linux MegaRAID driver for SAS based RAID controllers
+ *
+ * Copyright (c) 2003-2005  LSI Logic 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.h
+ */
+
+#ifndef LSI_MEGARAID_SAS_H
+#define LSI_MEGARAID_SAS_H
+
+/**
+ * MegaRAID SAS Driver meta data
+ */
+#define MEGASAS_VERSION                         "00.00.02.00-rc4"
+#define MEGASAS_RELDATE                         "Sep 16, 2005"
+#define MEGASAS_EXT_VERSION                     "Fri Sep 16 12:37:08 EDT 2005"
+
+/*
+ * =====================================
+ * MegaRAID SAS MFI firmware definitions
+ * =====================================
+ */
+
+/*
+ * MFI stands for  MegaRAID SAS FW Interface. This is just a moniker for 
+ * protocol between the software and firmware. Commands are issued using
+ * "message frames"
+ */
+
+/**
+ * FW posts its state in upper 4 bits of outbound_msg_0 register
+ */
+#define MFI_STATE_MASK                          0xF0000000
+#define MFI_STATE_UNDEFINED                     0x00000000
+#define MFI_STATE_BB_INIT                       0x10000000
+#define MFI_STATE_FW_INIT                       0x40000000
+#define MFI_STATE_WAIT_HANDSHAKE                0x60000000
+#define MFI_STATE_FW_INIT_2                     0x70000000
+#define MFI_STATE_DEVICE_SCAN                   0x80000000
+#define MFI_STATE_FLUSH_CACHE                   0xA0000000
+#define MFI_STATE_READY                         0xB0000000
+#define MFI_STATE_OPERATIONAL                   0xC0000000
+#define MFI_STATE_FAULT                         0xF0000000
+
+#define MEGAMFI_FRAME_SIZE                      64
+
+/**
+ * During FW init, clear pending cmds & reset state using inbound_msg_0
+ *
+ * ABORT        : Abort all pending cmds
+ * READY        : Move from OPERATIONAL to READY state; discard queue info
+ * MFIMODE      : Discard (possible) low MFA posted in 64-bit mode (??)
+ * CLR_HANDSHAKE: FW is waiting for HANDSHAKE from BIOS or Driver
+ */
+#define MFI_INIT_ABORT                          0x00000000
+#define MFI_INIT_READY                          0x00000002
+#define MFI_INIT_MFIMODE                        0x00000004
+#define MFI_INIT_CLEAR_HANDSHAKE                0x00000008
+#define MFI_RESET_FLAGS                         MFI_INIT_READY|MFI_INIT_MFIMODE
+
+/**
+ * MFI frame flags
+ */
+#define MFI_FRAME_POST_IN_REPLY_QUEUE           0x0000
+#define MFI_FRAME_DONT_POST_IN_REPLY_QUEUE      0x0001
+#define MFI_FRAME_SGL32                         0x0000
+#define MFI_FRAME_SGL64                         0x0002
+#define MFI_FRAME_SENSE32                       0x0000
+#define MFI_FRAME_SENSE64                       0x0004
+#define MFI_FRAME_DIR_NONE                      0x0000
+#define MFI_FRAME_DIR_WRITE                     0x0008
+#define MFI_FRAME_DIR_READ                      0x0010
+#define MFI_FRAME_DIR_BOTH                      0x0018
+
+/**
+ * Definition for cmd_status
+ */
+#define MFI_CMD_STATUS_POLL_MODE                0xFF
+
+/**
+ * MFI command opcodes
+ */
+#define MFI_CMD_INIT                            0x00
+#define MFI_CMD_LD_READ                         0x01
+#define MFI_CMD_LD_WRITE                        0x02
+#define MFI_CMD_LD_SCSI_IO                      0x03
+#define MFI_CMD_PD_SCSI_IO                      0x04
+#define MFI_CMD_DCMD                            0x05
+#define MFI_CMD_ABORT                           0x06
+#define MFI_CMD_SMP                             0x07
+#define MFI_CMD_STP                             0x08
+
+#define MR_DCMD_CTRL_GET_INFO                   0x01010000
+
+#define MR_DCMD_CTRL_CACHE_FLUSH                0x01101000
+#define MR_FLUSH_CTRL_CACHE                     0x01
+#define MR_FLUSH_DISK_CACHE                     0x02
+
+#define MR_DCMD_CTRL_SHUTDOWN                   0x01050000
+#define MR_ENABLE_DRIVE_SPINDOWN                0x01
+
+#define MR_DCMD_CTRL_EVENT_GET_INFO             0x01040100
+#define MR_DCMD_CTRL_EVENT_GET                  0x01040300
+#define MR_DCMD_CTRL_EVENT_WAIT                 0x01040500
+#define MR_DCMD_LD_GET_PROPERTIES               0x03030000
+
+#define MR_DCMD_CLUSTER                         0x08000000
+#define MR_DCMD_CLUSTER_RESET_ALL               0x08010100
+#define MR_DCMD_CLUSTER_RESET_LD                0x08010200
+
+/**
+ * MFI command completion codes
+ */
+enum MFI_STAT {
+        MFI_STAT_OK = 0x00,
+        MFI_STAT_INVALID_CMD = 0x01,
+        MFI_STAT_INVALID_DCMD = 0x02,
+        MFI_STAT_INVALID_PARAMETER = 0x03,
+        MFI_STAT_INVALID_SEQUENCE_NUMBER = 0x04,
+        MFI_STAT_ABORT_NOT_POSSIBLE = 0x05,
+        MFI_STAT_APP_HOST_CODE_NOT_FOUND = 0x06,
+        MFI_STAT_APP_IN_USE = 0x07,
+        MFI_STAT_APP_NOT_INITIALIZED = 0x08,
+        MFI_STAT_ARRAY_INDEX_INVALID = 0x09,
+        MFI_STAT_ARRAY_ROW_NOT_EMPTY = 0x0a,
+        MFI_STAT_CONFIG_RESOURCE_CONFLICT = 0x0b,
+        MFI_STAT_DEVICE_NOT_FOUND = 0x0c,
+        MFI_STAT_DRIVE_TOO_SMALL = 0x0d,
+        MFI_STAT_FLASH_ALLOC_FAIL = 0x0e,
+        MFI_STAT_FLASH_BUSY = 0x0f,
+        MFI_STAT_FLASH_ERROR = 0x10,
+        MFI_STAT_FLASH_IMAGE_BAD = 0x11,
+        MFI_STAT_FLASH_IMAGE_INCOMPLETE = 0x12,
+        MFI_STAT_FLASH_NOT_OPEN = 0x13,
+        MFI_STAT_FLASH_NOT_STARTED = 0x14,
+        MFI_STAT_FLUSH_FAILED = 0x15,
+        MFI_STAT_HOST_CODE_NOT_FOUNT = 0x16,
+        MFI_STAT_LD_CC_IN_PROGRESS = 0x17,
+        MFI_STAT_LD_INIT_IN_PROGRESS = 0x18,
+        MFI_STAT_LD_LBA_OUT_OF_RANGE = 0x19,
+        MFI_STAT_LD_MAX_CONFIGURED = 0x1a,
+        MFI_STAT_LD_NOT_OPTIMAL = 0x1b,
+        MFI_STAT_LD_RBLD_IN_PROGRESS = 0x1c,
+        MFI_STAT_LD_RECON_IN_PROGRESS = 0x1d,
+        MFI_STAT_LD_WRONG_RAID_LEVEL = 0x1e,
+        MFI_STAT_MAX_SPARES_EXCEEDED = 0x1f,
+        MFI_STAT_MEMORY_NOT_AVAILABLE = 0x20,
+        MFI_STAT_MFC_HW_ERROR = 0x21,
+        MFI_STAT_NO_HW_PRESENT = 0x22,
+        MFI_STAT_NOT_FOUND = 0x23,
+        MFI_STAT_NOT_IN_ENCL = 0x24,
+        MFI_STAT_PD_CLEAR_IN_PROGRESS = 0x25,
+        MFI_STAT_PD_TYPE_WRONG = 0x26,
+        MFI_STAT_PR_DISABLED = 0x27,
+        MFI_STAT_ROW_INDEX_INVALID = 0x28,
+        MFI_STAT_SAS_CONFIG_INVALID_ACTION = 0x29,
+        MFI_STAT_SAS_CONFIG_INVALID_DATA = 0x2a,
+        MFI_STAT_SAS_CONFIG_INVALID_PAGE = 0x2b,
+        MFI_STAT_SAS_CONFIG_INVALID_TYPE = 0x2c,
+        MFI_STAT_SCSI_DONE_WITH_ERROR = 0x2d,
+        MFI_STAT_SCSI_IO_FAILED = 0x2e,
+        MFI_STAT_SCSI_RESERVATION_CONFLICT = 0x2f,
+        MFI_STAT_SHUTDOWN_FAILED = 0x30,
+        MFI_STAT_TIME_NOT_SET = 0x31,
+        MFI_STAT_WRONG_STATE = 0x32,
+        MFI_STAT_LD_OFFLINE = 0x33,
+        MFI_STAT_PEER_NOTIFICATION_REJECTED = 0x34,
+        MFI_STAT_PEER_NOTIFICATION_FAILED = 0x35,
+        MFI_STAT_RESERVATION_IN_PROGRESS = 0x36,
+        MFI_STAT_I2C_ERRORS_DETECTED = 0x37,
+        MFI_STAT_PCI_ERRORS_DETECTED = 0x38,
+
+        MFI_STAT_INVALID_STATUS = 0xFF
+};
+
+/*
+ * Number of mailbox bytes in DCMD message frame
+ */
+#define MFI_MBOX_SIZE                           12
+
+enum MR_EVT_CLASS {
+
+        MR_EVT_CLASS_DEBUG = -2,
+        MR_EVT_CLASS_PROGRESS = -1,
+        MR_EVT_CLASS_INFO = 0,
+        MR_EVT_CLASS_WARNING = 1,
+        MR_EVT_CLASS_CRITICAL = 2,
+        MR_EVT_CLASS_FATAL = 3,
+        MR_EVT_CLASS_DEAD = 4,
+
+};
+
+enum MR_EVT_LOCALE {
+
+        MR_EVT_LOCALE_LD = 0x0001,
+        MR_EVT_LOCALE_PD = 0x0002,
+        MR_EVT_LOCALE_ENCL = 0x0004,
+        MR_EVT_LOCALE_BBU = 0x0008,
+        MR_EVT_LOCALE_SAS = 0x0010,
+        MR_EVT_LOCALE_CTRL = 0x0020,
+        MR_EVT_LOCALE_CONFIG = 0x0040,
+        MR_EVT_LOCALE_CLUSTER = 0x0080,
+        MR_EVT_LOCALE_ALL = 0xffff,
+
+};
+
+enum MR_EVT_ARGS {
+
+        MR_EVT_ARGS_NONE,
+        MR_EVT_ARGS_CDB_SENSE,
+        MR_EVT_ARGS_LD,
+        MR_EVT_ARGS_LD_COUNT,
+        MR_EVT_ARGS_LD_LBA,
+        MR_EVT_ARGS_LD_OWNER,
+        MR_EVT_ARGS_LD_LBA_PD_LBA,
+        MR_EVT_ARGS_LD_PROG,
+        MR_EVT_ARGS_LD_STATE,
+        MR_EVT_ARGS_LD_STRIP,
+        MR_EVT_ARGS_PD,
+        MR_EVT_ARGS_PD_ERR,
+        MR_EVT_ARGS_PD_LBA,
+        MR_EVT_ARGS_PD_LBA_LD,
+        MR_EVT_ARGS_PD_PROG,
+        MR_EVT_ARGS_PD_STATE,
+        MR_EVT_ARGS_PCI,
+        MR_EVT_ARGS_RATE,
+        MR_EVT_ARGS_STR,
+        MR_EVT_ARGS_TIME,
+        MR_EVT_ARGS_ECC,
+
+};
+
+/*
+ * SAS controller properties
+ */
+struct megasas_ctrl_prop {
+
+        u16 seq_num;
+        u16 pred_fail_poll_interval;
+        u16 intr_throttle_count;
+        u16 intr_throttle_timeouts;
+        u8 rebuild_rate;
+        u8 patrol_read_rate;
+        u8 bgi_rate;
+        u8 cc_rate;
+        u8 recon_rate;
+        u8 cache_flush_interval;
+        u8 spinup_drv_count;
+        u8 spinup_delay;
+        u8 cluster_enable;
+        u8 coercion_mode;
+        u8 alarm_enable;
+        u8 disable_auto_rebuild;
+        u8 disable_battery_warn;
+        u8 ecc_bucket_size;
+        u16 ecc_bucket_leak_rate;
+        u8 restore_hotspare_on_insertion;
+        u8 expose_encl_devices;
+        u8 reserved[38];
+
+} __attribute__ ((packed));
+
+/*
+ * SAS controller information
+ */
+struct megasas_ctrl_info {
+
+        /*
+         * PCI device information
+         */
+        struct {
+
+                u16 vendor_id;
+                u16 device_id;
+                u16 sub_vendor_id;
+                u16 sub_device_id;
+                u8 reserved[24];
+
+        } __attribute__ ((packed)) pci;
+
+        /*
+         * Host interface information
+         */
+        struct {
+
+                u8 PCIX:1;
+                u8 PCIE:1;
+                u8 iSCSI:1;
+                u8 SAS_3G:1;
+                u8 reserved_0:4;
+                u8 reserved_1[6];
+                u8 port_count;
+                u64 port_addr[8];
+
+        } __attribute__ ((packed)) host_interface;
+
+        /*
+         * Device (backend) interface information
+         */
+        struct {
+
+                u8 SPI:1;
+                u8 SAS_3G:1;
+                u8 SATA_1_5G:1;
+                u8 SATA_3G:1;
+                u8 reserved_0:4;
+                u8 reserved_1[6];
+                u8 port_count;
+                u64 port_addr[8];
+
+        } __attribute__ ((packed)) device_interface;
+
+        /*
+         * List of components residing in flash. All str are null terminated
+         */
+        u32 image_check_word;
+        u32 image_component_count;
+
+        struct {
+
+                char name[8];
+                char version[32];
+                char build_date[16];
+                char built_time[16];
+
+        } __attribute__ ((packed)) image_component[8];
+
+        /*
+         * List of flash components that have been flashed on the card, but
+         * are not in use, pending reset of the adapter. This list will be
+         * empty if a flash operation has not occurred. All stings are null
+         * terminated
+         */
+        u32 pending_image_component_count;
+
+        struct {
+
+                char name[8];
+                char version[32];
+                char build_date[16];
+                char build_time[16];
+
+        } __attribute__ ((packed)) pending_image_component[8];
+
+        u8 max_arms;
+        u8 max_spans;
+        u8 max_arrays;
+        u8 max_lds;
+
+        char product_name[80];
+        char serial_no[32];
+
+        /*
+         * Other physical/controller/operation information. Indicates the
+         * presence of the hardware
+         */
+        struct {
+
+                u32 bbu:1;
+                u32 alarm:1;
+                u32 nvram:1;
+                u32 uart:1;
+                u32 reserved:28;
+
+        } __attribute__ ((packed)) hw_present;
+
+        u32 current_fw_time;
+
+        /*
+         * Maximum data transfer sizes
+         */
+        u16 max_concurrent_cmds;
+        u16 max_sge_count;
+        u32 max_request_size;
+
+        /*
+         * Logical and physical device counts
+         */
+        u16 ld_present_count;
+        u16 ld_degraded_count;
+        u16 ld_offline_count;
+
+        u16 pd_present_count;
+        u16 pd_disk_present_count;
+        u16 pd_disk_pred_failure_count;
+        u16 pd_disk_failed_count;
+
+        /*
+         * Memory size information
+         */
+        u16 nvram_size;
+        u16 memory_size;
+        u16 flash_size;
+
+        /*
+         * Error counters
+         */
+        u16 mem_correctable_error_count;
+        u16 mem_uncorrectable_error_count;
+
+        /*
+         * Cluster information
+         */
+        u8 cluster_permitted;
+        u8 cluster_active;
+
+        /*
+         * Additional max data transfer sizes
+         */
+        u16 max_strips_per_io;
+
+        /*
+         * Controller capabilities structures
+         */
+        struct {
+
+                u32 raid_level_0:1;
+                u32 raid_level_1:1;
+                u32 raid_level_5:1;
+                u32 raid_level_1E:1;
+                u32 raid_level_6:1;
+                u32 reserved:27;
+
+        } __attribute__ ((packed)) raid_levels;
+
+        struct {
+
+                u32 rbld_rate:1;
+                u32 cc_rate:1;
+                u32 bgi_rate:1;
+                u32 recon_rate:1;
+                u32 patrol_rate:1;
+                u32 alarm_control:1;
+                u32 cluster_supported:1;
+                u32 bbu:1;
+                u32 spanning_allowed:1;
+                u32 dedicated_hotspares:1;
+                u32 revertible_hotspares:1;
+                u32 foreign_config_import:1;
+                u32 self_diagnostic:1;
+                u32 mixed_redundancy_arr:1;
+                u32 global_hot_spares:1;
+                u32 reserved:17;
+
+        } __attribute__ ((packed)) adapter_operations;
+
+        struct {
+
+                u32 read_policy:1;
+                u32 write_policy:1;
+                u32 io_policy:1;
+                u32 access_policy:1;
+                u32 disk_cache_policy:1;
+                u32 reserved:27;
+
+        } __attribute__ ((packed)) ld_operations;
+
+        struct {
+
+                u8 min;
+                u8 max;
+                u8 reserved[2];
+
+        } __attribute__ ((packed)) stripe_sz_ops;
+
+        struct {
+
+                u32 force_online:1;
+                u32 force_offline:1;
+                u32 force_rebuild:1;
+                u32 reserved:29;
+
+        } __attribute__ ((packed)) pd_operations;
+
+        struct {
+
+                u32 ctrl_supports_sas:1;
+                u32 ctrl_supports_sata:1;
+                u32 allow_mix_in_encl:1;
+                u32 allow_mix_in_ld:1;
+                u32 allow_sata_in_cluster:1;
+                u32 reserved:27;
+
+        } __attribute__ ((packed)) pd_mix_support;
+
+        /*
+         * Define ECC single-bit-error bucket information
+         */
+        u8 ecc_bucket_count;
+        u8 reserved_2[11];
+
+        /*
+         * Include the controller properties (changeable items)
+         */
+        struct megasas_ctrl_prop properties;
+
+        /*
+         * Define FW pkg version (set in envt v'bles on OEM basis)
+         */
+        char package_version[0x60];
+
+        u8 pad[0x800 - 0x6a0];
+
+} __attribute__ ((packed));
+
+/*
+ * ===============================
+ * MegaRAID SAS driver definitions
+ * ===============================
+ */
+#define MEGASAS_MAX_PD_CHANNELS                 2
+#define MEGASAS_MAX_LD_CHANNELS                 2
+#define MEGASAS_MAX_CHANNELS                    (MEGASAS_MAX_PD_CHANNELS + \
+                                                MEGASAS_MAX_LD_CHANNELS)
+#define MEGASAS_MAX_DEV_PER_CHANNEL             128
+#define MEGASAS_DEFAULT_INIT_ID                 -1
+#define MEGASAS_MAX_LUN                         8
+#define MEGASAS_MAX_LD                          64
+
+/*
+ * When SCSI mid-layer calls driver's reset routine, driver waits for
+ * MEGASAS_RESET_WAIT_TIME seconds for all outstanding IO to complete. Note
+ * that the driver cannot _actually_ abort or reset pending commands. While
+ * it is waiting for the commands to complete, it prints a diagnostic message
+ * every MEGASAS_RESET_NOTICE_INTERVAL seconds
+ */
+#define MEGASAS_RESET_WAIT_TIME                 180
+#define MEGASAS_RESET_NOTICE_INTERVAL           5
+
+#define MEGASAS_IOCTL_CMD                       0
+
+/*
+ * FW reports the maximum of number of commands that it can accept (maximum
+ * commands that can be outstanding) at any time. The driver must report a
+ * lower number to the mid layer because it can issue a few internal commands
+ * itself (E.g, AEN, abort cmd, IOCTLs etc). The number of commands it needs
+ * is shown below
+ */
+#define MEGASAS_INT_CMDS                        32
+
+/*
+ * FW can accept both 32 and 64 bit SGLs. We want to allocate 32/64 bit
+ * SGLs based on the size of dma_addr_t
+ */
+#define IS_DMA64                                (sizeof(dma_addr_t) == 8)
+
+#define MFI_OB_INTR_STATUS_MASK                 0x00000002
+#define MFI_POLL_TIMEOUT_SECS                   10
+
+struct megasas_register_set {
+
+        u32 reserved_0[4];      /*0000h */
+
+        u32 inbound_msg_0;      /*0010h */
+        u32 inbound_msg_1;      /*0014h */
+        u32 outbound_msg_0;     /*0018h */
+        u32 outbound_msg_1;     /*001Ch */
+
+        u32 inbound_doorbell;   /*0020h */
+        u32 inbound_intr_status;        /*0024h */
+        u32 inbound_intr_mask;  /*0028h */
+
+        u32 outbound_doorbell;  /*002Ch */
+        u32 outbound_intr_status;       /*0030h */
+        u32 outbound_intr_mask; /*0034h */
+
+        u32 reserved_1[2];      /*0038h */
+
+        u32 inbound_queue_port; /*0040h */
+        u32 outbound_queue_port;        /*0044h */
+
+        u32 reserved_2;         /*004Ch */
+
+        u32 index_registers[1004];      /*0050h */
+
+} __attribute__ ((packed));
+
+struct megasas_sge32 {
+
+        u32 phys_addr;
+        u32 length;
+
+} __attribute__ ((packed));
+
+struct megasas_sge64 {
+
+        u64 phys_addr;
+        u32 length;
+
+} __attribute__ ((packed));
+
+union megasas_sgl {
+
+        struct megasas_sge32 sge32[1];
+        struct megasas_sge64 sge64[1];
+
+} __attribute__ ((packed));
+
+struct megasas_header {
+
+        u8 cmd;                 /*00h */
+        u8 sense_len;           /*01h */
+        u8 cmd_status;          /*02h */
+        u8 scsi_status;         /*03h */
+
+        u8 target_id;           /*04h */
+        u8 lun;                 /*05h */
+        u8 cdb_len;             /*06h */
+        u8 sge_count;           /*07h */
+
+        u32 context;            /*08h */
+        u32 pad_0;              /*0Ch */
+
+        u16 flags;              /*10h */
+        u16 timeout;            /*12h */
+        u32 data_xferlen;       /*14h */
+
+} __attribute__ ((packed));
+
+union megasas_sgl_frame {
+
+        struct megasas_sge32 sge32[8];
+        struct megasas_sge64 sge64[5];
+
+} __attribute__ ((packed));
+
+struct megasas_init_frame {
+
+        u8 cmd;                 /*00h */
+        u8 reserved_0;          /*01h */
+        u8 cmd_status;          /*02h */
+
+        u8 reserved_1;          /*03h */
+        u32 reserved_2;         /*04h */
+
+        u32 context;            /*08h */
+        u32 pad_0;              /*0Ch */
+
+        u16 flags;              /*10h */
+        u16 reserved_3;         /*12h */
+        u32 data_xfer_len;      /*14h */
+
+        u32 queue_info_new_phys_addr_lo;        /*18h */
+        u32 queue_info_new_phys_addr_hi;        /*1Ch */
+        u32 queue_info_old_phys_addr_lo;        /*20h */
+        u32 queue_info_old_phys_addr_hi;        /*24h */
+
+        u32 reserved_4[6];      /*28h */
+
+} __attribute__ ((packed));
+
+struct megasas_init_queue_info {
+
+        u32 init_flags;         /*00h */
+        u32 reply_queue_entries;        /*04h */
+
+        u32 reply_queue_start_phys_addr_lo;     /*08h */
+        u32 reply_queue_start_phys_addr_hi;     /*0Ch */
+        u32 producer_index_phys_addr_lo;        /*10h */
+        u32 producer_index_phys_addr_hi;        /*14h */
+        u32 consumer_index_phys_addr_lo;        /*18h */
+        u32 consumer_index_phys_addr_hi;        /*1Ch */
+
+} __attribute__ ((packed));
+
+struct megasas_io_frame {
+
+        u8 cmd;                 /*00h */
+        u8 sense_len;           /*01h */
+        u8 cmd_status;          /*02h */
+        u8 scsi_status;         /*03h */
+
+        u8 target_id;           /*04h */
+        u8 access_byte;         /*05h */
+        u8 reserved_0;          /*06h */
+        u8 sge_count;           /*07h */
+
+        u32 context;            /*08h */
+        u32 pad_0;              /*0Ch */
+
+        u16 flags;              /*10h */
+        u16 timeout;            /*12h */
+        u32 lba_count;          /*14h */
+
+        u32 sense_buf_phys_addr_lo;     /*18h */
+        u32 sense_buf_phys_addr_hi;     /*1Ch */
+
+        u32 start_lba_lo;       /*20h */
+        u32 start_lba_hi;       /*24h */
+
+        union megasas_sgl sgl;  /*28h */
+
+} __attribute__ ((packed));
+
+struct megasas_pthru_frame {
+
+        u8 cmd;                 /*00h */
+        u8 sense_len;           /*01h */
+        u8 cmd_status;          /*02h */
+        u8 scsi_status;         /*03h */
+
+        u8 target_id;           /*04h */
+        u8 lun;                 /*05h */
+        u8 cdb_len;             /*06h */
+        u8 sge_count;           /*07h */
+
+        u32 context;            /*08h */
+        u32 pad_0;              /*0Ch */
+
+        u16 flags;              /*10h */
+        u16 timeout;            /*12h */
+        u32 data_xfer_len;      /*14h */
+
+        u32 sense_buf_phys_addr_lo;     /*18h */
+        u32 sense_buf_phys_addr_hi;     /*1Ch */
+
+        u8 cdb[16];             /*20h */
+        union megasas_sgl sgl;  /*30h */
+
+} __attribute__ ((packed));
+
+struct megasas_dcmd_frame {
+
+        u8 cmd;                 /*00h */
+        u8 reserved_0;          /*01h */
+        u8 cmd_status;          /*02h */
+        u8 reserved_1[4];       /*03h */
+        u8 sge_count;           /*07h */
+
+        u32 context;            /*08h */
+        u32 pad_0;              /*0Ch */
+
+        u16 flags;              /*10h */
+        u16 timeout;            /*12h */
+
+        u32 data_xfer_len;      /*14h */
+        u32 opcode;             /*18h */
+
+        union {                 /*1Ch */
+                u8 b[12];
+                u16 s[6];
+                u32 w[3];
+        } mbox;
+
+        union megasas_sgl sgl;  /*28h */
+
+} __attribute__ ((packed));
+
+struct megasas_abort_frame {
+
+        u8 cmd;                 /*00h */
+        u8 reserved_0;          /*01h */
+        u8 cmd_status;          /*02h */
+
+        u8 reserved_1;          /*03h */
+        u32 reserved_2;         /*04h */
+
+        u32 context;            /*08h */
+        u32 pad_0;              /*0Ch */
+
+        u16 flags;              /*10h */
+        u16 reserved_3;         /*12h */
+        u32 reserved_4;         /*14h */
+
+        u32 abort_context;      /*18h */
+        u32 pad_1;              /*1Ch */
+
+        u32 abort_mfi_phys_addr_lo;     /*20h */
+        u32 abort_mfi_phys_addr_hi;     /*24h */
+
+        u32 reserved_5[6];      /*28h */
+
+} __attribute__ ((packed));
+
+struct megasas_smp_frame {
+
+        u8 cmd;                 /*00h */
+        u8 reserved_1;          /*01h */
+        u8 cmd_status;          /*02h */
+        u8 connection_status;   /*03h */
+
+        u8 reserved_2[3];       /*04h */
+        u8 sge_count;           /*07h */
+
+        u32 context;            /*08h */
+        u32 pad_0;              /*0Ch */
+
+        u16 flags;              /*10h */
+        u16 timeout;            /*12h */
+
+        u32 data_xfer_len;      /*14h */
+        u64 sas_addr;           /*18h */
+
+        union {
+                struct megasas_sge32 sge32[2];  /* [0]: resp [1]: req */
+                struct megasas_sge64 sge64[2];  /* [0]: resp [1]: req */
+        } sgl;
+
+} __attribute__ ((packed));
+
+struct megasas_stp_frame {
+
+        u8 cmd;                 /*00h */
+        u8 reserved_1;          /*01h */
+        u8 cmd_status;          /*02h */
+        u8 reserved_2;          /*03h */
+
+        u8 target_id;           /*04h */
+        u8 reserved_3[2];       /*05h */
+        u8 sge_count;           /*07h */
+
+        u32 context;            /*08h */
+        u32 pad_0;              /*0Ch */
+
+        u16 flags;              /*10h */
+        u16 timeout;            /*12h */
+
+        u32 data_xfer_len;      /*14h */
+
+        u16 fis[10];            /*18h */
+        u32 stp_flags;
+
+        union {
+                struct megasas_sge32 sge32[2];  /* [0]: resp [1]: data */
+                struct megasas_sge64 sge64[2];  /* [0]: resp [1]: data */
+        } sgl;
+
+} __attribute__ ((packed));
+
+union megasas_frame {
+
+        struct megasas_header hdr;
+        struct megasas_init_frame init;
+        struct megasas_io_frame io;
+        struct megasas_pthru_frame pthru;
+        struct megasas_dcmd_frame dcmd;
+        struct megasas_abort_frame abort;
+        struct megasas_smp_frame smp;
+        struct megasas_stp_frame stp;
+
+        u8 raw_bytes[64];
+};
+
+struct megasas_cmd;
+
+union megasas_evt_class_locale {
+
+        struct {
+                u16 locale;
+                u8 reserved;
+                s8 class;
+        } __attribute__ ((packed)) members;
+
+        u32 word;
+
+} __attribute__ ((packed));
+
+struct megasas_evt_log_info {
+        u32 newest_seq_num;
+        u32 oldest_seq_num;
+        u32 clear_seq_num;
+        u32 shutdown_seq_num;
+        u32 boot_seq_num;
+
+} __attribute__ ((packed));
+
+struct megasas_progress {
+
+        u16 progress;
+        u16 elapsed_seconds;
+
+} __attribute__ ((packed));
+
+struct megasas_evtarg_ld {
+
+        u16 target_id;
+        u8 ld_index;
+        u8 reserved;
+
+} __attribute__ ((packed));
+
+struct megasas_evtarg_pd {
+        u16 device_id;
+        u8 encl_index;
+        u8 slot_number;
+
+} __attribute__ ((packed));
+
+struct megasas_evt_detail {
+
+        u32 seq_num;
+        u32 time_stamp;
+        u32 code;
+        union megasas_evt_class_locale cl;
+        u8 arg_type;
+        u8 reserved1[15];
+
+        union {
+                struct {
+                        struct megasas_evtarg_pd pd;
+                        u8 cdb_length;
+                        u8 sense_length;
+                        u8 reserved[2];
+                        u8 cdb[16];
+                        u8 sense[64];
+                } __attribute__ ((packed)) cdbSense;
+
+                struct megasas_evtarg_ld ld;
+
+                struct {
+                        struct megasas_evtarg_ld ld;
+                        u64 count;
+                } __attribute__ ((packed)) ld_count;
+
+                struct {
+                        u64 lba;
+                        struct megasas_evtarg_ld ld;
+                } __attribute__ ((packed)) ld_lba;
+
+                struct {
+                        struct megasas_evtarg_ld ld;
+                        u32 prevOwner;
+                        u32 newOwner;
+                } __attribute__ ((packed)) ld_owner;
+
+                struct {
+                        u64 ld_lba;
+                        u64 pd_lba;
+                        struct megasas_evtarg_ld ld;
+                        struct megasas_evtarg_pd pd;
+                } __attribute__ ((packed)) ld_lba_pd_lba;
+
+                struct {
+                        struct megasas_evtarg_ld ld;
+                        struct megasas_progress prog;
+                } __attribute__ ((packed)) ld_prog;
+
+                struct {
+                        struct megasas_evtarg_ld ld;
+                        u32 prev_state;
+                        u32 new_state;
+                } __attribute__ ((packed)) ld_state;
+
+                struct {
+                        u64 strip;
+                        struct megasas_evtarg_ld ld;
+                } __attribute__ ((packed)) ld_strip;
+
+                struct megasas_evtarg_pd pd;
+
+                struct {
+                        struct megasas_evtarg_pd pd;
+                        u32 err;
+                } __attribute__ ((packed)) pd_err;
+
+                struct {
+                        u64 lba;
+                        struct megasas_evtarg_pd pd;
+                } __attribute__ ((packed)) pd_lba;
+
+                struct {
+                        u64 lba;
+                        struct megasas_evtarg_pd pd;
+                        struct megasas_evtarg_ld ld;
+                } __attribute__ ((packed)) pd_lba_ld;
+
+                struct {
+                        struct megasas_evtarg_pd pd;
+                        struct megasas_progress prog;
+                } __attribute__ ((packed)) pd_prog;
+
+                struct {
+                        struct megasas_evtarg_pd pd;
+                        u32 prevState;
+                        u32 newState;
+                } __attribute__ ((packed)) pd_state;
+
+                struct {
+                        u16 vendorId;
+                        u16 deviceId;
+                        u16 subVendorId;
+                        u16 subDeviceId;
+                } __attribute__ ((packed)) pci;
+
+                u32 rate;
+                char str[96];
+
+                struct {
+                        u32 rtc;
+                        u32 elapsedSeconds;
+                } __attribute__ ((packed)) time;
+
+                struct {
+                        u32 ecar;
+                        u32 elog;
+                        char str[64];
+                } __attribute__ ((packed)) ecc;
+
+                u8 b[96];
+                u16 s[48];
+                u32 w[24];
+                u64 d[12];
+        } args;
+
+        char description[128];
+
+} __attribute__ ((packed));
+
+struct megasas_instance {
+
+        u32 *producer;
+        dma_addr_t producer_h;
+        u32 *consumer;
+        dma_addr_t consumer_h;
+
+        u32 *reply_queue;
+        dma_addr_t reply_queue_h;
+
+        unsigned long base_addr;
+        struct megasas_register_set __iomem *reg_set;
+
+        s8 init_id;
+        u8 reserved[3];
+
+        u16 max_num_sge;
+        u16 max_fw_cmds;
+        u32 max_sectors_per_req;
+
+        struct megasas_cmd **cmd_list;
+        struct list_head cmd_pool;
+        spinlock_t cmd_pool_lock;
+        struct dma_pool *frame_dma_pool;
+        struct dma_pool *sense_dma_pool;
+
+        struct megasas_evt_detail *evt_detail;
+        dma_addr_t evt_detail_h;
+        struct megasas_cmd *aen_cmd;
+        struct semaphore aen_mutex;
+        struct semaphore ioctl_sem;
+
+        struct Scsi_Host *host;
+
+        wait_queue_head_t int_cmd_wait_q;
+        wait_queue_head_t abort_cmd_wait_q;
+
+        struct pci_dev *pdev;
+        u32 unique_id;
+
+        u32 fw_outstanding;
+        u32 hw_crit_error;
+        spinlock_t instance_lock;
+};
+
+#define MEGASAS_IS_LOGICAL(scp)                                         \
+        (scp->device->channel < MEGASAS_MAX_PD_CHANNELS) ? 0 : 1
+
+#define MEGASAS_DEV_INDEX(inst, scp)                                    \
+        ((scp->device->channel % 2) * MEGASAS_MAX_DEV_PER_CHANNEL) +    \
+        scp->device->id
+
+struct megasas_cmd {
+
+        union megasas_frame *frame;
+        dma_addr_t frame_phys_addr;
+        u8 *sense;
+        dma_addr_t sense_phys_addr;
+
+        u32 index;
+        u8 sync_cmd;
+        u8 cmd_status;
+        u16 abort_aen;
+
+        struct list_head list;
+        struct scsi_cmnd *scmd;
+        struct megasas_instance *instance;
+        u32 frame_count;
+};
+
+#define MAX_MGMT_ADAPTERS               1024
+#define MAX_IOCTL_SGE                   16
+
+struct megasas_iocpacket {
+
+        u16 host_no;
+        u16 __pad1;
+        u32 sgl_off;
+        u32 sge_count;
+        u32 sense_off;
+        u32 sense_len;
+        union {
+                u8 raw[128];
+                struct megasas_header hdr;
+        } frame;
+
+        struct iovec sgl[MAX_IOCTL_SGE];
+
+} __attribute__ ((packed));
+
+struct megasas_aen {
+        u16 host_no;
+        u16 __pad1;
+        u32 seq_num;
+        u32 class_locale_word;
+} __attribute__ ((packed));
+
+#ifdef CONFIG_COMPAT
+struct compat_megasas_iocpacket {
+        u16 host_no;
+        u16 __pad1;
+        u32 sgl_off;
+        u32 sge_count;
+        u32 sense_off;
+        u32 sense_len;
+        union {
+                u8 raw[128];
+                struct megasas_header hdr;
+        } frame;
+        struct compat_iovec sgl[MAX_IOCTL_SGE];
+} __attribute__ ((packed));
+
+#define MEGASAS_IOC_FIRMWARE    _IOWR('M', 1, struct compat_megasas_iocpacket)
+#else
+#define MEGASAS_IOC_FIRMWARE    _IOWR('M', 1, struct megasas_iocpacket)
+#endif
+
+#define MEGASAS_IOC_GET_AEN     _IOW('M', 3, struct megasas_aen)
+
+struct megasas_mgmt_info {
+
+        u16 count;
+        struct megasas_instance *instance[MAX_MGMT_ADAPTERS];
+        int max_index;
+};
+
+#endif                          /*LSI_MEGARAID_SAS_H */