// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *
 *                      Linux MegaRAID device driver
 *
 * Copyright (c) 2002  LSI Logic Corporation.
 *
 * Copyright (c) 2002  Red Hat, Inc. All rights reserved.
 *        - fixes
 *        - speed-ups (list handling fixes, issued_list, optimizations.)
 *        - lots of cleanups.
 *
 * Copyright (c) 2003  Christoph Hellwig  <hch@lst.de>
 *        - new-style, hotplug-aware pci probing and scsi registration
 *
 * Version : v2.00.4 Mon Nov 14 14:02:43 EST 2005 - Seokmann Ju
 *                                              <Seokmann.Ju@lsil.com>
 *
 * Description: Linux device driver for LSI Logic MegaRAID controller
 *
 * Supported controllers: MegaRAID 418, 428, 438, 466, 762, 467, 471, 490, 493
 *                                      518, 520, 531, 532
 *
 * This driver is supported by LSI Logic, with assistance from Red Hat, Dell,
 * and others. Please send updates to the mailing list
 * linux-scsi@vger.kernel.org .
 */

#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/blkdev.h>
#include <linux/uaccess.h>
#include <asm/io.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/reboot.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <scsi/scsicam.h>

#include "scsi.h"
#include <scsi/scsi_host.h>

#include "megaraid.h"

#define MEGARAID_MODULE_VERSION "2.00.4"

MODULE_AUTHOR ("sju@lsil.com");
MODULE_DESCRIPTION ("LSI Logic MegaRAID legacy driver");
MODULE_LICENSE ("GPL");
MODULE_VERSION(MEGARAID_MODULE_VERSION);

static DEFINE_MUTEX(megadev_mutex);
static unsigned int max_cmd_per_lun = DEF_CMD_PER_LUN;
module_param(max_cmd_per_lun, uint, 0);
MODULE_PARM_DESC(max_cmd_per_lun, "Maximum number of commands which can be issued to a single LUN (default=DEF_CMD_PER_LUN=63)");

static unsigned short int max_sectors_per_io = MAX_SECTORS_PER_IO;
module_param(max_sectors_per_io, ushort, 0);
MODULE_PARM_DESC(max_sectors_per_io, "Maximum number of sectors per I/O request (default=MAX_SECTORS_PER_IO=128)");


static unsigned short int max_mbox_busy_wait = MBOX_BUSY_WAIT;
module_param(max_mbox_busy_wait, ushort, 0);
MODULE_PARM_DESC(max_mbox_busy_wait, "Maximum wait for mailbox in microseconds if busy (default=MBOX_BUSY_WAIT=10)");

#define RDINDOOR(adapter)       readl((adapter)->mmio_base + 0x20)
#define RDOUTDOOR(adapter)      readl((adapter)->mmio_base + 0x2C)
#define WRINDOOR(adapter,value)  writel(value, (adapter)->mmio_base + 0x20)
#define WROUTDOOR(adapter,value) writel(value, (adapter)->mmio_base + 0x2C)

/*
 * Global variables
 */

static int hba_count;
static adapter_t *hba_soft_state[MAX_CONTROLLERS];
static struct proc_dir_entry *mega_proc_dir_entry;

/* For controller re-ordering */
static struct mega_hbas mega_hbas[MAX_CONTROLLERS];

static long
megadev_unlocked_ioctl(struct file *filep, unsigned int cmd, unsigned long arg);

/*
 * The File Operations structure for the serial/ioctl interface of the driver
 */
static const struct file_operations megadev_fops = {
        .owner          = THIS_MODULE,
        .unlocked_ioctl = megadev_unlocked_ioctl,
        .open           = megadev_open,
        .llseek         = noop_llseek,
};

/*
 * Array to structures for storing the information about the controllers. This
 * information is sent to the user level applications, when they do an ioctl
 * for this information.
 */
static struct mcontroller mcontroller[MAX_CONTROLLERS];

/* The current driver version */
static u32 driver_ver = 0x02000000;

/* major number used by the device for character interface */
static int major;

#define IS_RAID_CH(hba, ch)     (((hba)->mega_ch_class >> (ch)) & 0x01)


/*
 * Debug variable to print some diagnostic messages
 */
static int trace_level;

/**
 * mega_setup_mailbox()
 * @adapter - pointer to our soft state
 *
 * Allocates a 8 byte aligned memory for the handshake mailbox.
 */
static int
mega_setup_mailbox(adapter_t *adapter)
{
        unsigned long   align;

        adapter->una_mbox64 = pci_alloc_consistent(adapter->dev,
                        sizeof(mbox64_t), &adapter->una_mbox64_dma);

        if( !adapter->una_mbox64 ) return -1;
                
        adapter->mbox = &adapter->una_mbox64->mbox;

        adapter->mbox = (mbox_t *)((((unsigned long) adapter->mbox) + 15) &
                        (~0UL ^ 0xFUL));

        adapter->mbox64 = (mbox64_t *)(((unsigned long)adapter->mbox) - 8);

        align = ((void *)adapter->mbox) - ((void *)&adapter->una_mbox64->mbox);

        adapter->mbox_dma = adapter->una_mbox64_dma + 8 + align;

        /*
         * Register the mailbox if the controller is an io-mapped controller
         */
        if( adapter->flag & BOARD_IOMAP ) {

                outb(adapter->mbox_dma & 0xFF,
                                adapter->host->io_port + MBOX_PORT0);

                outb((adapter->mbox_dma >> 8) & 0xFF,
                                adapter->host->io_port + MBOX_PORT1);

                outb((adapter->mbox_dma >> 16) & 0xFF,
                                adapter->host->io_port + MBOX_PORT2);

                outb((adapter->mbox_dma >> 24) & 0xFF,
                                adapter->host->io_port + MBOX_PORT3);

                outb(ENABLE_MBOX_BYTE,
                                adapter->host->io_port + ENABLE_MBOX_REGION);

                irq_ack(adapter);

                irq_enable(adapter);
        }

        return 0;
}


/*
 * mega_query_adapter()
 * @adapter - pointer to our soft state
 *
 * Issue the adapter inquiry commands to the controller and find out
 * information and parameter about the devices attached
 */
static int
mega_query_adapter(adapter_t *adapter)
{
        dma_addr_t      prod_info_dma_handle;
        mega_inquiry3   *inquiry3;
        u8      raw_mbox[sizeof(struct mbox_out)];
        mbox_t  *mbox;
        int     retval;

        /* Initialize adapter inquiry mailbox */

        mbox = (mbox_t *)raw_mbox;

        memset((void *)adapter->mega_buffer, 0, MEGA_BUFFER_SIZE);
        memset(&mbox->m_out, 0, sizeof(raw_mbox));

        /*
         * Try to issue Inquiry3 command
         * if not succeeded, then issue MEGA_MBOXCMD_ADAPTERINQ command and
         * update enquiry3 structure
         */
        mbox->m_out.xferaddr = (u32)adapter->buf_dma_handle;

        inquiry3 = (mega_inquiry3 *)adapter->mega_buffer;

        raw_mbox[0] = FC_NEW_CONFIG;            /* i.e. mbox->cmd=0xA1 */
        raw_mbox[2] = NC_SUBOP_ENQUIRY3;        /* i.e. 0x0F */
        raw_mbox[3] = ENQ3_GET_SOLICITED_FULL;  /* i.e. 0x02 */

        /* Issue a blocking command to the card */
        if ((retval = issue_scb_block(adapter, raw_mbox))) {
                /* the adapter does not support 40ld */

                mraid_ext_inquiry       *ext_inq;
                mraid_inquiry           *inq;
                dma_addr_t              dma_handle;

                ext_inq = pci_alloc_consistent(adapter->dev,
                                sizeof(mraid_ext_inquiry), &dma_handle);

                if( ext_inq == NULL ) return -1;

                inq = &ext_inq->raid_inq;

                mbox->m_out.xferaddr = (u32)dma_handle;

                /*issue old 0x04 command to adapter */
                mbox->m_out.cmd = MEGA_MBOXCMD_ADPEXTINQ;

                issue_scb_block(adapter, raw_mbox);

                /*
                 * update Enquiry3 and ProductInfo structures with
                 * mraid_inquiry structure
                 */
                mega_8_to_40ld(inq, inquiry3,
                                (mega_product_info *)&adapter->product_info);

                pci_free_consistent(adapter->dev, sizeof(mraid_ext_inquiry),
                                ext_inq, dma_handle);

        } else {                /*adapter supports 40ld */
                adapter->flag |= BOARD_40LD;

                /*
                 * get product_info, which is static information and will be
                 * unchanged
                 */
                prod_info_dma_handle = pci_map_single(adapter->dev, (void *)
                                &adapter->product_info,
                                sizeof(mega_product_info), PCI_DMA_FROMDEVICE);

                mbox->m_out.xferaddr = prod_info_dma_handle;

                raw_mbox[0] = FC_NEW_CONFIG;    /* i.e. mbox->cmd=0xA1 */
                raw_mbox[2] = NC_SUBOP_PRODUCT_INFO;    /* i.e. 0x0E */

                if ((retval = issue_scb_block(adapter, raw_mbox)))
                        dev_warn(&adapter->dev->dev,
                                "Product_info cmd failed with error: %d\n",
                                retval);

                pci_unmap_single(adapter->dev, prod_info_dma_handle,
                                sizeof(mega_product_info), PCI_DMA_FROMDEVICE);
        }


        /*
         * kernel scans the channels from 0 to <= max_channel
         */
        adapter->host->max_channel =
                adapter->product_info.nchannels + NVIRT_CHAN -1;

        adapter->host->max_id = 16;     /* max targets per channel */

        adapter->host->max_lun = 7;     /* Up to 7 luns for non disk devices */

        adapter->host->cmd_per_lun = max_cmd_per_lun;

        adapter->numldrv = inquiry3->num_ldrv;

        adapter->max_cmds = adapter->product_info.max_commands;

        if(adapter->max_cmds > MAX_COMMANDS)
                adapter->max_cmds = MAX_COMMANDS;

        adapter->host->can_queue = adapter->max_cmds - 1;

        /*
         * Get the maximum number of scatter-gather elements supported by this
         * firmware
         */
        mega_get_max_sgl(adapter);

        adapter->host->sg_tablesize = adapter->sglen;

        /* use HP firmware and bios version encoding
           Note: fw_version[0|1] and bios_version[0|1] were originally shifted
           right 8 bits making them zero. This 0 value was hardcoded to fix
           sparse warnings. */
        if (adapter->product_info.subsysvid == PCI_VENDOR_ID_HP) {
                snprintf(adapter->fw_version, sizeof(adapter->fw_version),
                         "%c%d%d.%d%d",
                         adapter->product_info.fw_version[2],
                         0,
                         adapter->product_info.fw_version[1] & 0x0f,
                         0,
                         adapter->product_info.fw_version[0] & 0x0f);
                snprintf(adapter->bios_version, sizeof(adapter->fw_version),
                         "%c%d%d.%d%d",
                         adapter->product_info.bios_version[2],
                         0,
                         adapter->product_info.bios_version[1] & 0x0f,
                         0,
                         adapter->product_info.bios_version[0] & 0x0f);
        } else {
                memcpy(adapter->fw_version,
                                (char *)adapter->product_info.fw_version, 4);
                adapter->fw_version[4] = 0;

                memcpy(adapter->bios_version,
                                (char *)adapter->product_info.bios_version, 4);

                adapter->bios_version[4] = 0;
        }

        dev_notice(&adapter->dev->dev, "[%s:%s] detected %d logical drives\n",
                adapter->fw_version, adapter->bios_version, adapter->numldrv);

        /*
         * Do we support extended (>10 bytes) cdbs
         */
        adapter->support_ext_cdb = mega_support_ext_cdb(adapter);
        if (adapter->support_ext_cdb)
                dev_notice(&adapter->dev->dev, "supports extended CDBs\n");


        return 0;
}

/**
 * mega_runpendq()
 * @adapter - pointer to our soft state
 *
 * Runs through the list of pending requests.
 */
static inline void
mega_runpendq(adapter_t *adapter)
{
        if(!list_empty(&adapter->pending_list))
                __mega_runpendq(adapter);
}

/*
 * megaraid_queue()
 * @scmd - Issue this scsi command
 * @done - the callback hook into the scsi mid-layer
 *
 * The command queuing entry point for the mid-layer.
 */
static int
megaraid_queue_lck(struct scsi_cmnd *scmd, void (*done)(struct scsi_cmnd *))
{
        adapter_t       *adapter;
        scb_t   *scb;
        int     busy=0;
        unsigned long flags;

        adapter = (adapter_t *)scmd->device->host->hostdata;

        scmd->scsi_done = done;


        /*
         * Allocate and build a SCB request
         * busy flag will be set if mega_build_cmd() command could not
         * allocate scb. We will return non-zero status in that case.
         * NOTE: scb can be null even though certain commands completed
         * successfully, e.g., MODE_SENSE and TEST_UNIT_READY, we would
         * return 0 in that case.
         */

        spin_lock_irqsave(&adapter->lock, flags);
        scb = mega_build_cmd(adapter, scmd, &busy);
        if (!scb)
                goto out;

        scb->state |= SCB_PENDQ;
        list_add_tail(&scb->list, &adapter->pending_list);

        /*
         * Check if the HBA is in quiescent state, e.g., during a
         * delete logical drive opertion. If it is, don't run
         * the pending_list.
         */
        if (atomic_read(&adapter->quiescent) == 0)
                mega_runpendq(adapter);

        busy = 0;
 out:
        spin_unlock_irqrestore(&adapter->lock, flags);
        return busy;
}

static DEF_SCSI_QCMD(megaraid_queue)

/**
 * mega_allocate_scb()
 * @adapter - pointer to our soft state
 * @cmd - scsi command from the mid-layer
 *
 * Allocate a SCB structure. This is the central structure for controller
 * commands.
 */
static inline scb_t *
mega_allocate_scb(adapter_t *adapter, struct scsi_cmnd *cmd)
{
        struct list_head *head = &adapter->free_list;
        scb_t   *scb;

        /* Unlink command from Free List */
        if( !list_empty(head) ) {

                scb = list_entry(head->next, scb_t, list);

                list_del_init(head->next);

                scb->state = SCB_ACTIVE;
                scb->cmd = cmd;
                scb->dma_type = MEGA_DMA_TYPE_NONE;

                return scb;
        }

        return NULL;
}

/**
 * mega_get_ldrv_num()
 * @adapter - pointer to our soft state
 * @cmd - scsi mid layer command
 * @channel - channel on the controller
 *
 * Calculate the logical drive number based on the information in scsi command
 * and the channel number.
 */
static inline int
mega_get_ldrv_num(adapter_t *adapter, struct scsi_cmnd *cmd, int channel)
{
        int             tgt;
        int             ldrv_num;

        tgt = cmd->device->id;
        
        if ( tgt > adapter->this_id )
                tgt--;  /* we do not get inquires for initiator id */

        ldrv_num = (channel * 15) + tgt;


        /*
         * If we have a logical drive with boot enabled, project it first
         */
        if( adapter->boot_ldrv_enabled ) {
                if( ldrv_num == 0 ) {
                        ldrv_num = adapter->boot_ldrv;
                }
                else {
                        if( ldrv_num <= adapter->boot_ldrv ) {
                                ldrv_num--;
                        }
                }
        }

        /*
         * If "delete logical drive" feature is enabled on this controller.
         * Do only if at least one delete logical drive operation was done.
         *
         * Also, after logical drive deletion, instead of logical drive number,
         * the value returned should be 0x80+logical drive id.
         *
         * These is valid only for IO commands.
         */

        if (adapter->support_random_del && adapter->read_ldidmap )
                switch (cmd->cmnd[0]) {
                case READ_6:    /* fall through */
                case WRITE_6:   /* fall through */
                case READ_10:   /* fall through */
                case WRITE_10:
                        ldrv_num += 0x80;
                }

        return ldrv_num;
}

/**
 * mega_build_cmd()
 * @adapter - pointer to our soft state
 * @cmd - Prepare using this scsi command
 * @busy - busy flag if no resources
 *
 * Prepares a command and scatter gather list for the controller. This routine
 * also finds out if the commands is intended for a logical drive or a
 * physical device and prepares the controller command accordingly.
 *
 * We also re-order the logical drives and physical devices based on their
 * boot settings.
 */
static scb_t *
mega_build_cmd(adapter_t *adapter, struct scsi_cmnd *cmd, int *busy)
{
        mega_ext_passthru       *epthru;
        mega_passthru   *pthru;
        scb_t   *scb;
        mbox_t  *mbox;
        u32     seg;
        char    islogical;
        int     max_ldrv_num;
        int     channel = 0;
        int     target = 0;
        int     ldrv_num = 0;   /* logical drive number */

        /*
         * We know what channels our logical drives are on - mega_find_card()
         */
        islogical = adapter->logdrv_chan[cmd->device->channel];

        /*
         * The theory: If physical drive is chosen for boot, all the physical
         * devices are exported before the logical drives, otherwise physical
         * devices are pushed after logical drives, in which case - Kernel sees
         * the physical devices on virtual channel which is obviously converted
         * to actual channel on the HBA.
         */
        if( adapter->boot_pdrv_enabled ) {
                if( islogical ) {
                        /* logical channel */
                        channel = cmd->device->channel -
                                adapter->product_info.nchannels;
                }
                else {
                        /* this is physical channel */
                        channel = cmd->device->channel; 
                        target = cmd->device->id;

                        /*
                         * boot from a physical disk, that disk needs to be
                         * exposed first IF both the channels are SCSI, then
                         * booting from the second channel is not allowed.
                         */
                        if( target == 0 ) {
                                target = adapter->boot_pdrv_tgt;
                        }
                        else if( target == adapter->boot_pdrv_tgt ) {
                                target = 0;
                        }
                }
        }
        else {
                if( islogical ) {
                        /* this is the logical channel */
                        channel = cmd->device->channel; 
                }
                else {
                        /* physical channel */
                        channel = cmd->device->channel - NVIRT_CHAN;    
                        target = cmd->device->id;
                }
        }


        if(islogical) {

                /* have just LUN 0 for each target on virtual channels */
                if (cmd->device->lun) {
                        cmd->result = (DID_BAD_TARGET << 16);
                        cmd->scsi_done(cmd);
                        return NULL;
                }

                ldrv_num = mega_get_ldrv_num(adapter, cmd, channel);


                max_ldrv_num = (adapter->flag & BOARD_40LD) ?
                        MAX_LOGICAL_DRIVES_40LD : MAX_LOGICAL_DRIVES_8LD;

                /*
                 * max_ldrv_num increases by 0x80 if some logical drive was
                 * deleted.
                 */
                if(adapter->read_ldidmap)
                        max_ldrv_num += 0x80;

                if(ldrv_num > max_ldrv_num ) {
                        cmd->result = (DID_BAD_TARGET << 16);
                        cmd->scsi_done(cmd);
                        return NULL;
                }

        }
        else {
                if( cmd->device->lun > 7) {
                        /*
                         * Do not support lun >7 for physically accessed
                         * devices
                         */
                        cmd->result = (DID_BAD_TARGET << 16);
                        cmd->scsi_done(cmd);
                        return NULL;
                }
        }

        /*
         *
         * Logical drive commands
         *
         */
        if(islogical) {
                switch (cmd->cmnd[0]) {
                case TEST_UNIT_READY:
#if MEGA_HAVE_CLUSTERING
                        /*
                         * Do we support clustering and is the support enabled
                         * If no, return success always
                         */
                        if( !adapter->has_cluster ) {
                                cmd->result = (DID_OK << 16);
                                cmd->scsi_done(cmd);
                                return NULL;
                        }

                        if(!(scb = mega_allocate_scb(adapter, cmd))) {
                                *busy = 1;
                                return NULL;
                        }

                        scb->raw_mbox[0] = MEGA_CLUSTER_CMD;
                        scb->raw_mbox[2] = MEGA_RESERVATION_STATUS;
                        scb->raw_mbox[3] = ldrv_num;

                        scb->dma_direction = PCI_DMA_NONE;

                        return scb;
#else
                        cmd->result = (DID_OK << 16);
                        cmd->scsi_done(cmd);
                        return NULL;
#endif

                case MODE_SENSE: {
                        char *buf;
                        struct scatterlist *sg;

                        sg = scsi_sglist(cmd);
                        buf = kmap_atomic(sg_page(sg)) + sg->offset;

                        memset(buf, 0, cmd->cmnd[4]);
                        kunmap_atomic(buf - sg->offset);

                        cmd->result = (DID_OK << 16);
                        cmd->scsi_done(cmd);
                        return NULL;
                }

                case READ_CAPACITY:
                case INQUIRY:

                        if(!(adapter->flag & (1L << cmd->device->channel))) {

                                dev_notice(&adapter->dev->dev,
                                        "scsi%d: scanning scsi channel %d "
                                        "for logical drives\n",
                                                adapter->host->host_no,
                                                cmd->device->channel);

                                adapter->flag |= (1L << cmd->device->channel);
                        }

                        /* Allocate a SCB and initialize passthru */
                        if(!(scb = mega_allocate_scb(adapter, cmd))) {
                                *busy = 1;
                                return NULL;
                        }
                        pthru = scb->pthru;

                        mbox = (mbox_t *)scb->raw_mbox;
                        memset(mbox, 0, sizeof(scb->raw_mbox));
                        memset(pthru, 0, sizeof(mega_passthru));

                        pthru->timeout = 0;
                        pthru->ars = 1;
                        pthru->reqsenselen = 14;
                        pthru->islogical = 1;
                        pthru->logdrv = ldrv_num;
                        pthru->cdblen = cmd->cmd_len;
                        memcpy(pthru->cdb, cmd->cmnd, cmd->cmd_len);

                        if( adapter->has_64bit_addr ) {
                                mbox->m_out.cmd = MEGA_MBOXCMD_PASSTHRU64;
                        }
                        else {
                                mbox->m_out.cmd = MEGA_MBOXCMD_PASSTHRU;
                        }

                        scb->dma_direction = PCI_DMA_FROMDEVICE;

                        pthru->numsgelements = mega_build_sglist(adapter, scb,
                                &pthru->dataxferaddr, &pthru->dataxferlen);

                        mbox->m_out.xferaddr = scb->pthru_dma_addr;

                        return scb;

                case READ_6:
                case WRITE_6:
                case READ_10:
                case WRITE_10:
                case READ_12:
                case WRITE_12:

                        /* Allocate a SCB and initialize mailbox */
                        if(!(scb = mega_allocate_scb(adapter, cmd))) {
                                *busy = 1;
                                return NULL;
                        }
                        mbox = (mbox_t *)scb->raw_mbox;

                        memset(mbox, 0, sizeof(scb->raw_mbox));
                        mbox->m_out.logdrv = ldrv_num;

                        /*
                         * A little hack: 2nd bit is zero for all scsi read
                         * commands and is set for all scsi write commands
                         */
                        if( adapter->has_64bit_addr ) {
                                mbox->m_out.cmd = (*cmd->cmnd & 0x02) ?
                                        MEGA_MBOXCMD_LWRITE64:
                                        MEGA_MBOXCMD_LREAD64 ;
                        }
                        else {
                                mbox->m_out.cmd = (*cmd->cmnd & 0x02) ?
                                        MEGA_MBOXCMD_LWRITE:
                                        MEGA_MBOXCMD_LREAD ;
                        }

                        /*
                         * 6-byte READ(0x08) or WRITE(0x0A) cdb
                         */
                        if( cmd->cmd_len == 6 ) {
                                mbox->m_out.numsectors = (u32) cmd->cmnd[4];
                                mbox->m_out.lba =
                                        ((u32)cmd->cmnd[1] << 16) |
                                        ((u32)cmd->cmnd[2] << 8) |
                                        (u32)cmd->cmnd[3];

                                mbox->m_out.lba &= 0x1FFFFF;

#if MEGA_HAVE_STATS
                                /*
                                 * Take modulo 0x80, since the logical drive
                                 * number increases by 0x80 when a logical
                                 * drive was deleted
                                 */
                                if (*cmd->cmnd == READ_6) {
                                        adapter->nreads[ldrv_num%0x80]++;
                                        adapter->nreadblocks[ldrv_num%0x80] +=
                                                mbox->m_out.numsectors;
                                } else {
                                        adapter->nwrites[ldrv_num%0x80]++;
                                        adapter->nwriteblocks[ldrv_num%0x80] +=
                                                mbox->m_out.numsectors;
                                }
#endif
                        }

                        /*
                         * 10-byte READ(0x28) or WRITE(0x2A) cdb
                         */
                        if( cmd->cmd_len == 10 ) {
                                mbox->m_out.numsectors =
                                        (u32)cmd->cmnd[8] |
                                        ((u32)cmd->cmnd[7] << 8);
                                mbox->m_out.lba =
                                        ((u32)cmd->cmnd[2] << 24) |
                                        ((u32)cmd->cmnd[3] << 16) |
                                        ((u32)cmd->cmnd[4] << 8) |
                                        (u32)cmd->cmnd[5];

#if MEGA_HAVE_STATS
                                if (*cmd->cmnd == READ_10) {
                                        adapter->nreads[ldrv_num%0x80]++;
                                        adapter->nreadblocks[ldrv_num%0x80] +=
                                                mbox->m_out.numsectors;
                                } else {
                                        adapter->nwrites[ldrv_num%0x80]++;
                                        adapter->nwriteblocks[ldrv_num%0x80] +=
                                                mbox->m_out.numsectors;
                                }
#endif
                        }

                        /*
                         * 12-byte READ(0xA8) or WRITE(0xAA) cdb
                         */
                        if( cmd->cmd_len == 12 ) {
                                mbox->m_out.lba =
                                        ((u32)cmd->cmnd[2] << 24) |
                                        ((u32)cmd->cmnd[3] << 16) |
                                        ((u32)cmd->cmnd[4] << 8) |
                                        (u32)cmd->cmnd[5];

                                mbox->m_out.numsectors =
                                        ((u32)cmd->cmnd[6] << 24) |
                                        ((u32)cmd->cmnd[7] << 16) |
                                        ((u32)cmd->cmnd[8] << 8) |
                                        (u32)cmd->cmnd[9];

#if MEGA_HAVE_STATS
                                if (*cmd->cmnd == READ_12) {
                                        adapter->nreads[ldrv_num%0x80]++;
                                        adapter->nreadblocks[ldrv_num%0x80] +=
                                                mbox->m_out.numsectors;
                                } else {
                                        adapter->nwrites[ldrv_num%0x80]++;
                                        adapter->nwriteblocks[ldrv_num%0x80] +=
                                                mbox->m_out.numsectors;
                                }
#endif
                        }

                        /*
                         * If it is a read command
                         */
                        if( (*cmd->cmnd & 0x0F) == 0x08 ) {
                                scb->dma_direction = PCI_DMA_FROMDEVICE;
                        }
                        else {
                                scb->dma_direction = PCI_DMA_TODEVICE;
                        }

                        /* Calculate Scatter-Gather info */
                        mbox->m_out.numsgelements = mega_build_sglist(adapter, scb,
                                        (u32 *)&mbox->m_out.xferaddr, &seg);

                        return scb;

#if MEGA_HAVE_CLUSTERING
                case RESERVE:   /* Fall through */
                case RELEASE:

                        /*
                         * Do we support clustering and is the support enabled
                         */
                        if( ! adapter->has_cluster ) {

                                cmd->result = (DID_BAD_TARGET << 16);
                                cmd->scsi_done(cmd);
                                return NULL;
                        }

                        /* Allocate a SCB and initialize mailbox */
                        if(!(scb = mega_allocate_scb(adapter, cmd))) {
                                *busy = 1;
                                return NULL;
                        }

                        scb->raw_mbox[0] = MEGA_CLUSTER_CMD;
                        scb->raw_mbox[2] = ( *cmd->cmnd == RESERVE ) ?
                                MEGA_RESERVE_LD : MEGA_RELEASE_LD;

                        scb->raw_mbox[3] = ldrv_num;

                        scb->dma_direction = PCI_DMA_NONE;

                        return scb;
#endif

                default:
                        cmd->result = (DID_BAD_TARGET << 16);
                        cmd->scsi_done(cmd);
                        return NULL;
                }
        }

        /*
         * Passthru drive commands
         */
        else {
                /* Allocate a SCB and initialize passthru */
                if(!(scb = mega_allocate_scb(adapter, cmd))) {
                        *busy = 1;
                        return NULL;
                }

                mbox = (mbox_t *)scb->raw_mbox;
                memset(mbox, 0, sizeof(scb->raw_mbox));

                if( adapter->support_ext_cdb ) {

                        epthru = mega_prepare_extpassthru(adapter, scb, cmd,
                                        channel, target);

                        mbox->m_out.cmd = MEGA_MBOXCMD_EXTPTHRU;

                        mbox->m_out.xferaddr = scb->epthru_dma_addr;

                }
                else {

                        pthru = mega_prepare_passthru(adapter, scb, cmd,
                                        channel, target);

                        /* Initialize mailbox */
                        if( adapter->has_64bit_addr ) {
                                mbox->m_out.cmd = MEGA_MBOXCMD_PASSTHRU64;
                        }
                        else {
                                mbox->m_out.cmd = MEGA_MBOXCMD_PASSTHRU;
                        }

                        mbox->m_out.xferaddr = scb->pthru_dma_addr;

                }
                return scb;
        }
        return NULL;
}


/**
 * mega_prepare_passthru()
 * @adapter - pointer to our soft state
 * @scb - our scsi control block
 * @cmd - scsi command from the mid-layer
 * @channel - actual channel on the controller
 * @target - actual id on the controller.
 *
 * prepare a command for the scsi physical devices.
 */
static mega_passthru *
mega_prepare_passthru(adapter_t *adapter, scb_t *scb, struct scsi_cmnd *cmd,
                      int channel, int target)
{
        mega_passthru *pthru;

        pthru = scb->pthru;
        memset(pthru, 0, sizeof (mega_passthru));

        /* 0=6sec/1=60sec/2=10min/3=3hrs */
        pthru->timeout = 2;

        pthru->ars = 1;
        pthru->reqsenselen = 14;
        pthru->islogical = 0;

        pthru->channel = (adapter->flag & BOARD_40LD) ? 0 : channel;

        pthru->target = (adapter->flag & BOARD_40LD) ?
                (channel << 4) | target : target;

        pthru->cdblen = cmd->cmd_len;
        pthru->logdrv = cmd->device->lun;

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

        /* Not sure about the direction */
        scb->dma_direction = PCI_DMA_BIDIRECTIONAL;

        /* Special Code for Handling READ_CAPA/ INQ using bounce buffers */
        switch (cmd->cmnd[0]) {
        case INQUIRY:
        case READ_CAPACITY:
                if(!(adapter->flag & (1L << cmd->device->channel))) {

                        dev_notice(&adapter->dev->dev,
                                "scsi%d: scanning scsi channel %d [P%d] "
                                "for physical devices\n",
                                        adapter->host->host_no,
                                        cmd->device->channel, channel);

                        adapter->flag |= (1L << cmd->device->channel);
                }
                /* Fall through */
        default:
                pthru->numsgelements = mega_build_sglist(adapter, scb,
                                &pthru->dataxferaddr, &pthru->dataxferlen);
                break;
        }
        return pthru;
}

/**
 * mega_prepare_extpassthru()
 * @adapter - pointer to our soft state
 * @scb - our scsi control block
 * @cmd - scsi command from the mid-layer
 * @channel - actual channel on the controller
 * @target - actual id on the controller.
 *
 * prepare a command for the scsi physical devices. This rountine prepares
 * commands for devices which can take extended CDBs (>10 bytes)
 */
static mega_ext_passthru *
mega_prepare_extpassthru(adapter_t *adapter, scb_t *scb,
                         struct scsi_cmnd *cmd,
                         int channel, int target)
{
        mega_ext_passthru       *epthru;

        epthru = scb->epthru;
        memset(epthru, 0, sizeof(mega_ext_passthru));

        /* 0=6sec/1=60sec/2=10min/3=3hrs */
        epthru->timeout = 2;

        epthru->ars = 1;
        epthru->reqsenselen = 14;
        epthru->islogical = 0;

        epthru->channel = (adapter->flag & BOARD_40LD) ? 0 : channel;
        epthru->target = (adapter->flag & BOARD_40LD) ?
                (channel << 4) | target : target;

        epthru->cdblen = cmd->cmd_len;
        epthru->logdrv = cmd->device->lun;

        memcpy(epthru->cdb, cmd->cmnd, cmd->cmd_len);

        /* Not sure about the direction */
        scb->dma_direction = PCI_DMA_BIDIRECTIONAL;

        switch(cmd->cmnd[0]) {
        case INQUIRY:
        case READ_CAPACITY:
                if(!(adapter->flag & (1L << cmd->device->channel))) {

                        dev_notice(&adapter->dev->dev,
                                "scsi%d: scanning scsi channel %d [P%d] "
                                "for physical devices\n",
                                        adapter->host->host_no,
                                        cmd->device->channel, channel);

                        adapter->flag |= (1L << cmd->device->channel);
                }
                /* Fall through */
        default:
                epthru->numsgelements = mega_build_sglist(adapter, scb,
                                &epthru->dataxferaddr, &epthru->dataxferlen);
                break;
        }

        return epthru;
}

static void
__mega_runpendq(adapter_t *adapter)
{
        scb_t *scb;
        struct list_head *pos, *next;

        /* Issue any pending commands to the card */
        list_for_each_safe(pos, next, &adapter->pending_list) {

                scb = list_entry(pos, scb_t, list);

                if( !(scb->state & SCB_ISSUED) ) {

                        if( issue_scb(adapter, scb) != 0 )
                                return;
                }
        }

        return;
}


/**
 * issue_scb()
 * @adapter - pointer to our soft state
 * @scb - scsi control block
 *
 * Post a command to the card if the mailbox is available, otherwise return
 * busy. We also take the scb from the pending list if the mailbox is
 * available.
 */
static int
issue_scb(adapter_t *adapter, scb_t *scb)
{
        volatile mbox64_t       *mbox64 = adapter->mbox64;
        volatile mbox_t         *mbox = adapter->mbox;
        unsigned int    i = 0;

        if(unlikely(mbox->m_in.busy)) {
                do {
                        udelay(1);
                        i++;
                } while( mbox->m_in.busy && (i < max_mbox_busy_wait) );

                if(mbox->m_in.busy) return -1;
        }

        /* Copy mailbox data into host structure */
        memcpy((char *)&mbox->m_out, (char *)scb->raw_mbox, 
                        sizeof(struct mbox_out));

        mbox->m_out.cmdid = scb->idx;   /* Set cmdid */
        mbox->m_in.busy = 1;            /* Set busy */


        /*
         * Increment the pending queue counter
         */
        atomic_inc(&adapter->pend_cmds);

        switch (mbox->m_out.cmd) {
        case MEGA_MBOXCMD_LREAD64:
        case MEGA_MBOXCMD_LWRITE64:
        case MEGA_MBOXCMD_PASSTHRU64:
        case MEGA_MBOXCMD_EXTPTHRU:
                mbox64->xfer_segment_lo = mbox->m_out.xferaddr;
                mbox64->xfer_segment_hi = 0;
                mbox->m_out.xferaddr = 0xFFFFFFFF;
                break;
        default:
                mbox64->xfer_segment_lo = 0;
                mbox64->xfer_segment_hi = 0;
        }

        /*
         * post the command
         */
        scb->state |= SCB_ISSUED;

        if( likely(adapter->flag & BOARD_MEMMAP) ) {
                mbox->m_in.poll = 0;
                mbox->m_in.ack = 0;
                WRINDOOR(adapter, adapter->mbox_dma | 0x1);
        }
        else {
                irq_enable(adapter);
                issue_command(adapter);
        }

        return 0;
}

/*
 * Wait until the controller's mailbox is available
 */
static inline int
mega_busywait_mbox (adapter_t *adapter)
{
        if (adapter->mbox->m_in.busy)
                return __mega_busywait_mbox(adapter);
        return 0;
}

/**
 * issue_scb_block()
 * @adapter - pointer to our soft state
 * @raw_mbox - the mailbox
 *
 * Issue a scb in synchronous and non-interrupt mode
 */
static int
issue_scb_block(adapter_t *adapter, u_char *raw_mbox)
{
        volatile mbox64_t *mbox64 = adapter->mbox64;
        volatile mbox_t *mbox = adapter->mbox;
        u8      byte;

        /* Wait until mailbox is free */
        if(mega_busywait_mbox (adapter))
                goto bug_blocked_mailbox;

        /* Copy mailbox data into host structure */
        memcpy((char *) mbox, raw_mbox, sizeof(struct mbox_out));
        mbox->m_out.cmdid = 0xFE;
        mbox->m_in.busy = 1;

        switch (raw_mbox[0]) {
        case MEGA_MBOXCMD_LREAD64:
        case MEGA_MBOXCMD_LWRITE64:
        case MEGA_MBOXCMD_PASSTHRU64:
        case MEGA_MBOXCMD_EXTPTHRU:
                mbox64->xfer_segment_lo = mbox->m_out.xferaddr;
                mbox64->xfer_segment_hi = 0;
                mbox->m_out.xferaddr = 0xFFFFFFFF;
                break;
        default:
                mbox64->xfer_segment_lo = 0;
                mbox64->xfer_segment_hi = 0;
        }

        if( likely(adapter->flag & BOARD_MEMMAP) ) {
                mbox->m_in.poll = 0;
                mbox->m_in.ack = 0;
                mbox->m_in.numstatus = 0xFF;
                mbox->m_in.status = 0xFF;
                WRINDOOR(adapter, adapter->mbox_dma | 0x1);

                while((volatile u8)mbox->m_in.numstatus == 0xFF)
                        cpu_relax();

                mbox->m_in.numstatus = 0xFF;

                while( (volatile u8)mbox->m_in.poll != 0x77 )
                        cpu_relax();

                mbox->m_in.poll = 0;
                mbox->m_in.ack = 0x77;

                WRINDOOR(adapter, adapter->mbox_dma | 0x2);

                while(RDINDOOR(adapter) & 0x2)
                        cpu_relax();
        }
        else {
                irq_disable(adapter);
                issue_command(adapter);

                while (!((byte = irq_state(adapter)) & INTR_VALID))
                        cpu_relax();

                set_irq_state(adapter, byte);
                irq_enable(adapter);
                irq_ack(adapter);
        }

        return mbox->m_in.status;

bug_blocked_mailbox:
        dev_warn(&adapter->dev->dev, "Blocked mailbox......!!\n");
        udelay (1000);
        return -1;
}


/**
 * megaraid_isr_iomapped()
 * @irq - irq
 * @devp - pointer to our soft state
 *
 * Interrupt service routine for io-mapped controllers.
 * Find out if our device is interrupting. If yes, acknowledge the interrupt
 * and service the completed commands.
 */
static irqreturn_t
megaraid_isr_iomapped(int irq, void *devp)
{
        adapter_t       *adapter = devp;
        unsigned long   flags;
        u8      status;
        u8      nstatus;
        u8      completed[MAX_FIRMWARE_STATUS];
        u8      byte;
        int     handled = 0;


        /*
         * loop till F/W has more commands for us to complete.
         */
        spin_lock_irqsave(&adapter->lock, flags);

        do {
                /* Check if a valid interrupt is pending */
                byte = irq_state(adapter);
                if( (byte & VALID_INTR_BYTE) == 0 ) {
                        /*
                         * No more pending commands
                         */
                        goto out_unlock;
                }
                set_irq_state(adapter, byte);

                while((nstatus = (volatile u8)adapter->mbox->m_in.numstatus)
                                == 0xFF)
                        cpu_relax();
                adapter->mbox->m_in.numstatus = 0xFF;

                status = adapter->mbox->m_in.status;

                /*
                 * decrement the pending queue counter
                 */
                atomic_sub(nstatus, &adapter->pend_cmds);

                memcpy(completed, (void *)adapter->mbox->m_in.completed, 
                                nstatus);

                /* Acknowledge interrupt */
                irq_ack(adapter);

                mega_cmd_done(adapter, completed, nstatus, status);

                mega_rundoneq(adapter);

                handled = 1;

                /* Loop through any pending requests */
                if(atomic_read(&adapter->quiescent) == 0) {
                        mega_runpendq(adapter);
                }

        } while(1);

 out_unlock:

        spin_unlock_irqrestore(&adapter->lock, flags);

        return IRQ_RETVAL(handled);
}


/**
 * megaraid_isr_memmapped()
 * @irq - irq
 * @devp - pointer to our soft state
 *
 * Interrupt service routine for memory-mapped controllers.
 * Find out if our device is interrupting. If yes, acknowledge the interrupt
 * and service the completed commands.
 */
static irqreturn_t
megaraid_isr_memmapped(int irq, void *devp)
{
        adapter_t       *adapter = devp;
        unsigned long   flags;
        u8      status;
        u32     dword = 0;
        u8      nstatus;
        u8      completed[MAX_FIRMWARE_STATUS];
        int     handled = 0;


        /*
         * loop till F/W has more commands for us to complete.
         */
        spin_lock_irqsave(&adapter->lock, flags);

        do {
                /* Check if a valid interrupt is pending */
                dword = RDOUTDOOR(adapter);
                if(dword != 0x10001234) {
                        /*
                         * No more pending commands
                         */
                        goto out_unlock;
                }
                WROUTDOOR(adapter, 0x10001234);

                while((nstatus = (volatile u8)adapter->mbox->m_in.numstatus)
                                == 0xFF) {
                        cpu_relax();
                }
                adapter->mbox->m_in.numstatus = 0xFF;

                status = adapter->mbox->m_in.status;

                /*
                 * decrement the pending queue counter
                 */
                atomic_sub(nstatus, &adapter->pend_cmds);

                memcpy(completed, (void *)adapter->mbox->m_in.completed, 
                                nstatus);

                /* Acknowledge interrupt */
                WRINDOOR(adapter, 0x2);

                handled = 1;

                while( RDINDOOR(adapter) & 0x02 )
                        cpu_relax();

                mega_cmd_done(adapter, completed, nstatus, status);

                mega_rundoneq(adapter);

                /* Loop through any pending requests */
                if(atomic_read(&adapter->quiescent) == 0) {
                        mega_runpendq(adapter);
                }

        } while(1);

 out_unlock:

        spin_unlock_irqrestore(&adapter->lock, flags);

        return IRQ_RETVAL(handled);
}
/**
 * mega_cmd_done()
 * @adapter - pointer to our soft state
 * @completed - array of ids of completed commands
 * @nstatus - number of completed commands
 * @status - status of the last command completed
 *
 * Complete the commands and call the scsi mid-layer callback hooks.
 */
static void
mega_cmd_done(adapter_t *adapter, u8 completed[], int nstatus, int status)
{
        mega_ext_passthru       *epthru = NULL;
        struct scatterlist      *sgl;
        struct scsi_cmnd        *cmd = NULL;
        mega_passthru   *pthru = NULL;
        mbox_t  *mbox = NULL;
        u8      c;
        scb_t   *scb;
        int     islogical;
        int     cmdid;
        int     i;

        /*
         * for all the commands completed, call the mid-layer callback routine
         * and free the scb.
         */
        for( i = 0; i < nstatus; i++ ) {

                cmdid = completed[i];

                /*
                 * Only free SCBs for the commands coming down from the
                 * mid-layer, not for which were issued internally
                 *
                 * For internal command, restore the status returned by the
                 * firmware so that user can interpret it.
                 */
                if (cmdid == CMDID_INT_CMDS) {
                        scb = &adapter->int_scb;

                        list_del_init(&scb->list);
                        scb->state = SCB_FREE;

                        adapter->int_status = status;
                        complete(&adapter->int_waitq);
                } else {
                        scb = &adapter->scb_list[cmdid];

                        /*
                         * Make sure f/w has completed a valid command
                         */
                        if( !(scb->state & SCB_ISSUED) || scb->cmd == NULL ) {
                                dev_crit(&adapter->dev->dev, "invalid command "
                                        "Id %d, scb->state:%x, scsi cmd:%p\n",
                                        cmdid, scb->state, scb->cmd);

                                continue;
                        }

                        /*
                         * Was a abort issued for this command
                         */
                        if( scb->state & SCB_ABORT ) {

                                dev_warn(&adapter->dev->dev,
                                        "aborted cmd [%x] complete\n",
                                        scb->idx);

                                scb->cmd->result = (DID_ABORT << 16);

                                list_add_tail(SCSI_LIST(scb->cmd),
                                                &adapter->completed_list);

                                mega_free_scb(adapter, scb);

                                continue;
                        }

                        /*
                         * Was a reset issued for this command
                         */
                        if( scb->state & SCB_RESET ) {

                                dev_warn(&adapter->dev->dev,
                                        "reset cmd [%x] complete\n",
                                        scb->idx);

                                scb->cmd->result = (DID_RESET << 16);

                                list_add_tail(SCSI_LIST(scb->cmd),
                                                &adapter->completed_list);

                                mega_free_scb (adapter, scb);

                                continue;
                        }

                        cmd = scb->cmd;
                        pthru = scb->pthru;
                        epthru = scb->epthru;
                        mbox = (mbox_t *)scb->raw_mbox;

#if MEGA_HAVE_STATS
                        {

                        int     logdrv = mbox->m_out.logdrv;

                        islogical = adapter->logdrv_chan[cmd->channel];
                        /*
                         * Maintain an error counter for the logical drive.
                         * Some application like SNMP agent need such
                         * statistics
                         */
                        if( status && islogical && (cmd->cmnd[0] == READ_6 ||
                                                cmd->cmnd[0] == READ_10 ||
                                                cmd->cmnd[0] == READ_12)) {
                                /*
                                 * Logical drive number increases by 0x80 when
                                 * a logical drive is deleted
                                 */
                                adapter->rd_errors[logdrv%0x80]++;
                        }

                        if( status && islogical && (cmd->cmnd[0] == WRITE_6 ||
                                                cmd->cmnd[0] == WRITE_10 ||
                                                cmd->cmnd[0] == WRITE_12)) {
                                /*
                                 * Logical drive number increases by 0x80 when
                                 * a logical drive is deleted
                                 */
                                adapter->wr_errors[logdrv%0x80]++;
                        }

                        }
#endif
                }

                /*
                 * Do not return the presence of hard disk on the channel so,
                 * inquiry sent, and returned data==hard disk or removable
                 * hard disk and not logical, request should return failure! -
                 * PJ
                 */
                islogical = adapter->logdrv_chan[cmd->device->channel];
                if( cmd->cmnd[0] == INQUIRY && !islogical ) {

                        sgl = scsi_sglist(cmd);
                        if( sg_page(sgl) ) {
                                c = *(unsigned char *) sg_virt(&sgl[0]);
                        } else {
                                dev_warn(&adapter->dev->dev, "invalid sg\n");
                                c = 0;
                        }

                        if(IS_RAID_CH(adapter, cmd->device->channel) &&
                                        ((c & 0x1F ) == TYPE_DISK)) {
                                status = 0xF0;
                        }
                }

                /* clear result; otherwise, success returns corrupt value */
                cmd->result = 0;

                /* Convert MegaRAID status to Linux error code */
                switch (status) {
                case 0x00:      /* SUCCESS , i.e. SCSI_STATUS_GOOD */
                        cmd->result |= (DID_OK << 16);
                        break;

                case 0x02:      /* ERROR_ABORTED, i.e.
                                   SCSI_STATUS_CHECK_CONDITION */

                        /* set sense_buffer and result fields */
                        if( mbox->m_out.cmd == MEGA_MBOXCMD_PASSTHRU ||
                                mbox->m_out.cmd == MEGA_MBOXCMD_PASSTHRU64 ) {

                                memcpy(cmd->sense_buffer, pthru->reqsensearea,
                                                14);

                                cmd->result = (DRIVER_SENSE << 24) |
                                        (DID_OK << 16) |
                                        (CHECK_CONDITION << 1);
                        }
                        else {
                                if (mbox->m_out.cmd == MEGA_MBOXCMD_EXTPTHRU) {

                                        memcpy(cmd->sense_buffer,
                                                epthru->reqsensearea, 14);

                                        cmd->result = (DRIVER_SENSE << 24) |
                                                (DID_OK << 16) |
                                                (CHECK_CONDITION << 1);
                                } else {
                                        cmd->sense_buffer[0] = 0x70;
                                        cmd->sense_buffer[2] = ABORTED_COMMAND;
                                        cmd->result |= (CHECK_CONDITION << 1);
                                }
                        }
                        break;

                case 0x08:      /* ERR_DEST_DRIVE_FAILED, i.e.
                                   SCSI_STATUS_BUSY */
                        cmd->result |= (DID_BUS_BUSY << 16) | status;
                        break;

                default:
#if MEGA_HAVE_CLUSTERING
                        /*
                         * If TEST_UNIT_READY fails, we know
                         * MEGA_RESERVATION_STATUS failed
                         */
                        if( cmd->cmnd[0] == TEST_UNIT_READY ) {
                                cmd->result |= (DID_ERROR << 16) |
                                        (RESERVATION_CONFLICT << 1);
                        }
                        else
                        /*
                         * Error code returned is 1 if Reserve or Release
                         * failed or the input parameter is invalid
                         */
                        if( status == 1 &&
                                (cmd->cmnd[0] == RESERVE ||
                                         cmd->cmnd[0] == RELEASE) ) {

                                cmd->result |= (DID_ERROR << 16) |
                                        (RESERVATION_CONFLICT << 1);
                        }
                        else
#endif
                                cmd->result |= (DID_BAD_TARGET << 16)|status;
                }

                mega_free_scb(adapter, scb);

                /* Add Scsi_Command to end of completed queue */
                list_add_tail(SCSI_LIST(cmd), &adapter->completed_list);
        }
}


/*
 * mega_runpendq()
 *
 * Run through the list of completed requests and finish it
 */
static void
mega_rundoneq (adapter_t *adapter)
{
        struct scsi_cmnd *cmd;
        struct list_head *pos;

        list_for_each(pos, &adapter->completed_list) {

                struct scsi_pointer* spos = (struct scsi_pointer *)pos;

                cmd = list_entry(spos, struct scsi_cmnd, SCp);
                cmd->scsi_done(cmd);
        }

        INIT_LIST_HEAD(&adapter->completed_list);
}


/*
 * Free a SCB structure
 * Note: We assume the scsi commands associated with this scb is not free yet.
 */
static void
mega_free_scb(adapter_t *adapter, scb_t *scb)
{
        switch( scb->dma_type ) {

        case MEGA_DMA_TYPE_NONE:
                break;

        case MEGA_SGLIST:
                scsi_dma_unmap(scb->cmd);
                break;
        default:
                break;
        }

        /*
         * Remove from the pending list
         */
        list_del_init(&scb->list);

        /* Link the scb back into free list */
        scb->state = SCB_FREE;
        scb->cmd = NULL;

        list_add(&scb->list, &adapter->free_list);
}


static int
__mega_busywait_mbox (adapter_t *adapter)
{
        volatile mbox_t *mbox = adapter->mbox;
        long counter;

        for (counter = 0; counter < 10000; counter++) {
                if (!mbox->m_in.busy)
                        return 0;
                udelay(100);
                cond_resched();
        }
        return -1;              /* give up after 1 second */
}

/*
 * Copies data to SGLIST
 * Note: For 64 bit cards, we need a minimum of one SG element for read/write
 */
static int
mega_build_sglist(adapter_t *adapter, scb_t *scb, u32 *buf, u32 *len)
{
        struct scatterlist *sg;
        struct scsi_cmnd        *cmd;
        int     sgcnt;
        int     idx;

        cmd = scb->cmd;

        /*
         * Copy Scatter-Gather list info into controller structure.
         *
         * The number of sg elements returned must not exceed our limit
         */
        sgcnt = scsi_dma_map(cmd);

        scb->dma_type = MEGA_SGLIST;

        BUG_ON(sgcnt > adapter->sglen || sgcnt < 0);

        *len = 0;

        if (scsi_sg_count(cmd) == 1 && !adapter->has_64bit_addr) {
                sg = scsi_sglist(cmd);
                scb->dma_h_bulkdata = sg_dma_address(sg);
                *buf = (u32)scb->dma_h_bulkdata;
                *len = sg_dma_len(sg);
                return 0;
        }

        scsi_for_each_sg(cmd, sg, sgcnt, idx) {
                if (adapter->has_64bit_addr) {
                        scb->sgl64[idx].address = sg_dma_address(sg);
                        *len += scb->sgl64[idx].length = sg_dma_len(sg);
                } else {
                        scb->sgl[idx].address = sg_dma_address(sg);
                        *len += scb->sgl[idx].length = sg_dma_len(sg);
                }
        }

        /* Reset pointer and length fields */
        *buf = scb->sgl_dma_addr;

        /* Return count of SG requests */
        return sgcnt;
}


/*
 * mega_8_to_40ld()
 *
 * takes all info in AdapterInquiry structure and puts it into ProductInfo and
 * Enquiry3 structures for later use
 */
static void
mega_8_to_40ld(mraid_inquiry *inquiry, mega_inquiry3 *enquiry3,
                mega_product_info *product_info)
{
        int i;

        product_info->max_commands = inquiry->adapter_info.max_commands;
        enquiry3->rebuild_rate = inquiry->adapter_info.rebuild_rate;
        product_info->nchannels = inquiry->adapter_info.nchannels;

        for (i = 0; i < 4; i++) {
                product_info->fw_version[i] =
                        inquiry->adapter_info.fw_version[i];

                product_info->bios_version[i] =
                        inquiry->adapter_info.bios_version[i];
        }
        enquiry3->cache_flush_interval =
                inquiry->adapter_info.cache_flush_interval;

        product_info->dram_size = inquiry->adapter_info.dram_size;

        enquiry3->num_ldrv = inquiry->logdrv_info.num_ldrv;

        for (i = 0; i < MAX_LOGICAL_DRIVES_8LD; i++) {
                enquiry3->ldrv_size[i] = inquiry->logdrv_info.ldrv_size[i];
                enquiry3->ldrv_prop[i] = inquiry->logdrv_info.ldrv_prop[i];
                enquiry3->ldrv_state[i] = inquiry->logdrv_info.ldrv_state[i];
        }

        for (i = 0; i < (MAX_PHYSICAL_DRIVES); i++)
                enquiry3->pdrv_state[i] = inquiry->pdrv_info.pdrv_state[i];
}

static inline void
mega_free_sgl(adapter_t *adapter)
{
        scb_t   *scb;
        int     i;

        for(i = 0; i < adapter->max_cmds; i++) {

                scb = &adapter->scb_list[i];

                if( scb->sgl64 ) {
                        pci_free_consistent(adapter->dev,
                                sizeof(mega_sgl64) * adapter->sglen,
                                scb->sgl64,
                                scb->sgl_dma_addr);

                        scb->sgl64 = NULL;
                }

                if( scb->pthru ) {
                        pci_free_consistent(adapter->dev, sizeof(mega_passthru),
                                scb->pthru, scb->pthru_dma_addr);

                        scb->pthru = NULL;
                }

                if( scb->epthru ) {
                        pci_free_consistent(adapter->dev,
                                sizeof(mega_ext_passthru),
                                scb->epthru, scb->epthru_dma_addr);

                        scb->epthru = NULL;
                }

        }
}


/*
 * Get information about the card/driver
 */
const char *
megaraid_info(struct Scsi_Host *host)
{
        static char buffer[512];
        adapter_t *adapter;

        adapter = (adapter_t *)host->hostdata;

        sprintf (buffer,
                 "LSI Logic MegaRAID %s %d commands %d targs %d chans %d luns",
                 adapter->fw_version, adapter->product_info.max_commands,
                 adapter->host->max_id, adapter->host->max_channel,
                 (u32)adapter->host->max_lun);
        return buffer;
}

/*
 * Abort a previous SCSI request. Only commands on the pending list can be
 * aborted. All the commands issued to the F/W must complete.
 */
static int
megaraid_abort(struct scsi_cmnd *cmd)
{
        adapter_t       *adapter;
        int             rval;

        adapter = (adapter_t *)cmd->device->host->hostdata;

        rval =  megaraid_abort_and_reset(adapter, cmd, SCB_ABORT);

        /*
         * This is required here to complete any completed requests
         * to be communicated over to the mid layer.
         */
        mega_rundoneq(adapter);

        return rval;
}


static int
megaraid_reset(struct scsi_cmnd *cmd)
{
        adapter_t       *adapter;
        megacmd_t       mc;
        int             rval;

        adapter = (adapter_t *)cmd->device->host->hostdata;

#if MEGA_HAVE_CLUSTERING
        mc.cmd = MEGA_CLUSTER_CMD;
        mc.opcode = MEGA_RESET_RESERVATIONS;

        if( mega_internal_command(adapter, &mc, NULL) != 0 ) {
                dev_warn(&adapter->dev->dev, "reservation reset failed\n");
        }
        else {
                dev_info(&adapter->dev->dev, "reservation reset\n");
        }
#endif

        spin_lock_irq(&adapter->lock);

        rval =  megaraid_abort_and_reset(adapter, cmd, SCB_RESET);

        /*
         * This is required here to complete any completed requests
         * to be communicated over to the mid layer.
         */
        mega_rundoneq(adapter);
        spin_unlock_irq(&adapter->lock);

        return rval;
}

/**
 * megaraid_abort_and_reset()
 * @adapter - megaraid soft state
 * @cmd - scsi command to be aborted or reset
 * @aor - abort or reset flag
 *
 * Try to locate the scsi command in the pending queue. If found and is not
 * issued to the controller, abort/reset it. Otherwise return failure
 */
static int
megaraid_abort_and_reset(adapter_t *adapter, struct scsi_cmnd *cmd, int aor)
{
        struct list_head        *pos, *next;
        scb_t                   *scb;

        dev_warn(&adapter->dev->dev, "%s cmd=%x <c=%d t=%d l=%d>\n",
             (aor == SCB_ABORT)? "ABORTING":"RESET",
             cmd->cmnd[0], cmd->device->channel,
             cmd->device->id, (u32)cmd->device->lun);

        if(list_empty(&adapter->pending_list))
                return FAILED;

        list_for_each_safe(pos, next, &adapter->pending_list) {

                scb = list_entry(pos, scb_t, list);

                if (scb->cmd == cmd) { /* Found command */

                        scb->state |= aor;

                        /*
                         * Check if this command has firmware ownership. If
                         * yes, we cannot reset this command. Whenever f/w
                         * completes this command, we will return appropriate
                         * status from ISR.
                         */
                        if( scb->state & SCB_ISSUED ) {

                                dev_warn(&adapter->dev->dev,
                                        "%s[%x], fw owner\n",
                                        (aor==SCB_ABORT) ? "ABORTING":"RESET",
                                        scb->idx);

                                return FAILED;
                        }
                        else {

                                /*
                                 * Not yet issued! Remove from the pending
                                 * list
                                 */
                                dev_warn(&adapter->dev->dev,
                                        "%s-[%x], driver owner\n",
                                        (aor==SCB_ABORT) ? "ABORTING":"RESET",
                                        scb->idx);

                                mega_free_scb(adapter, scb);

                                if( aor == SCB_ABORT ) {
                                        cmd->result = (DID_ABORT << 16);
                                }
                                else {
                                        cmd->result = (DID_RESET << 16);
                                }

                                list_add_tail(SCSI_LIST(cmd),
                                                &adapter->completed_list);

                                return SUCCESS;
                        }
                }
        }

        return FAILED;
}

static inline int
make_local_pdev(adapter_t *adapter, struct pci_dev **pdev)

{
        *pdev = pci_alloc_dev(NULL);

        if( *pdev == NULL ) return -1;

        memcpy(*pdev, adapter->dev, sizeof(struct pci_dev));

        if( pci_set_dma_mask(*pdev, DMA_BIT_MASK(32)) != 0 ) {
                kfree(*pdev);
                return -1;
        }

        return 0;
}

static inline void
free_local_pdev(struct pci_dev *pdev)
{
        kfree(pdev);
}

/**
 * mega_allocate_inquiry()
 * @dma_handle - handle returned for dma address
 * @pdev - handle to pci device
 *
 * allocates memory for inquiry structure
 */
static inline void *
mega_allocate_inquiry(dma_addr_t *dma_handle, struct pci_dev *pdev)
{
        return pci_alloc_consistent(pdev, sizeof(mega_inquiry3), dma_handle);
}


static inline void
mega_free_inquiry(void *inquiry, dma_addr_t dma_handle, struct pci_dev *pdev)
{
        pci_free_consistent(pdev, sizeof(mega_inquiry3), inquiry, dma_handle);
}


#ifdef CONFIG_PROC_FS
/* Following code handles /proc fs  */

/**
 * proc_show_config()
 * @m - Synthetic file construction data
 * @v - File iterator
 *
 * Display configuration information about the controller.
 */
static int
proc_show_config(struct seq_file *m, void *v)
{

        adapter_t *adapter = m->private;

        seq_puts(m, MEGARAID_VERSION);
        if(adapter->product_info.product_name[0])
                seq_printf(m, "%s\n", adapter->product_info.product_name);

        seq_puts(m, "Controller Type: ");

        if( adapter->flag & BOARD_MEMMAP )
                seq_puts(m, "438/466/467/471/493/518/520/531/532\n");
        else
                seq_puts(m, "418/428/434\n");

        if(adapter->flag & BOARD_40LD)
                seq_puts(m, "Controller Supports 40 Logical Drives\n");

        if(adapter->flag & BOARD_64BIT)
                seq_puts(m, "Controller capable of 64-bit memory addressing\n");
        if( adapter->has_64bit_addr )
                seq_puts(m, "Controller using 64-bit memory addressing\n");
        else
                seq_puts(m, "Controller is not using 64-bit memory addressing\n");

        seq_printf(m, "Base = %08lx, Irq = %d, ",
                   adapter->base, adapter->host->irq);

        seq_printf(m, "Logical Drives = %d, Channels = %d\n",
                   adapter->numldrv, adapter->product_info.nchannels);

        seq_printf(m, "Version =%s:%s, DRAM = %dMb\n",
                   adapter->fw_version, adapter->bios_version,
                   adapter->product_info.dram_size);

        seq_printf(m, "Controller Queue Depth = %d, Driver Queue Depth = %d\n",
                   adapter->product_info.max_commands, adapter->max_cmds);

        seq_printf(m, "support_ext_cdb    = %d\n", adapter->support_ext_cdb);
        seq_printf(m, "support_random_del = %d\n", adapter->support_random_del);
        seq_printf(m, "boot_ldrv_enabled  = %d\n", adapter->boot_ldrv_enabled);
        seq_printf(m, "boot_ldrv          = %d\n", adapter->boot_ldrv);
        seq_printf(m, "boot_pdrv_enabled  = %d\n", adapter->boot_pdrv_enabled);
        seq_printf(m, "boot_pdrv_ch       = %d\n", adapter->boot_pdrv_ch);
        seq_printf(m, "boot_pdrv_tgt      = %d\n", adapter->boot_pdrv_tgt);
        seq_printf(m, "quiescent          = %d\n",
                   atomic_read(&adapter->quiescent));
        seq_printf(m, "has_cluster        = %d\n", adapter->has_cluster);

        seq_puts(m, "\nModule Parameters:\n");
        seq_printf(m, "max_cmd_per_lun    = %d\n", max_cmd_per_lun);
        seq_printf(m, "max_sectors_per_io = %d\n", max_sectors_per_io);
        return 0;
}

/**
 * proc_show_stat()
 * @m - Synthetic file construction data
 * @v - File iterator
 *
 * Display statistical information about the I/O activity.
 */
static int
proc_show_stat(struct seq_file *m, void *v)
{
        adapter_t *adapter = m->private;
#if MEGA_HAVE_STATS
        int     i;
#endif

        seq_puts(m, "Statistical Information for this controller\n");
        seq_printf(m, "pend_cmds = %d\n", atomic_read(&adapter->pend_cmds));
#if MEGA_HAVE_STATS
        for(i = 0; i < adapter->numldrv; i++) {
                seq_printf(m, "Logical Drive %d:\n", i);
                seq_printf(m, "\tReads Issued = %lu, Writes Issued = %lu\n",
                           adapter->nreads[i], adapter->nwrites[i]);
                seq_printf(m, "\tSectors Read = %lu, Sectors Written = %lu\n",
                           adapter->nreadblocks[i], adapter->nwriteblocks[i]);
                seq_printf(m, "\tRead errors = %lu, Write errors = %lu\n\n",
                           adapter->rd_errors[i], adapter->wr_errors[i]);
        }
#else
        seq_puts(m, "IO and error counters not compiled in driver.\n");
#endif
        return 0;
}


/**
 * proc_show_mbox()
 * @m - Synthetic file construction data
 * @v - File iterator
 *
 * Display mailbox information for the last command issued. This information
 * is good for debugging.
 */
static int
proc_show_mbox(struct seq_file *m, void *v)
{
        adapter_t       *adapter = m->private;
        volatile mbox_t *mbox = adapter->mbox;

        seq_puts(m, "Contents of Mail Box Structure\n");
        seq_printf(m, "  Fw Command   = 0x%02x\n", mbox->m_out.cmd);
        seq_printf(m, "  Cmd Sequence = 0x%02x\n", mbox->m_out.cmdid);
        seq_printf(m, "  No of Sectors= %04d\n", mbox->m_out.numsectors);
        seq_printf(m, "  LBA          = 0x%02x\n", mbox->m_out.lba);
        seq_printf(m, "  DTA          = 0x%08x\n", mbox->m_out.xferaddr);
        seq_printf(m, "  Logical Drive= 0x%02x\n", mbox->m_out.logdrv);
        seq_printf(m, "  No of SG Elmt= 0x%02x\n", mbox->m_out.numsgelements);
        seq_printf(m, "  Busy         = %01x\n", mbox->m_in.busy);
        seq_printf(m, "  Status       = 0x%02x\n", mbox->m_in.status);
        return 0;
}


/**
 * proc_show_rebuild_rate()
 * @m - Synthetic file construction data
 * @v - File iterator
 *
 * Display current rebuild rate
 */
static int
proc_show_rebuild_rate(struct seq_file *m, void *v)
{
        adapter_t       *adapter = m->private;
        dma_addr_t      dma_handle;
        caddr_t         inquiry;
        struct pci_dev  *pdev;

        if( make_local_pdev(adapter, &pdev) != 0 )
                return 0;

        if( (inquiry = mega_allocate_inquiry(&dma_handle, pdev)) == NULL )
                goto free_pdev;

        if( mega_adapinq(adapter, dma_handle) != 0 ) {
                seq_puts(m, "Adapter inquiry failed.\n");
                dev_warn(&adapter->dev->dev, "inquiry failed\n");
                goto free_inquiry;
        }

        if( adapter->flag & BOARD_40LD )
                seq_printf(m, "Rebuild Rate: [%d%%]\n",
                           ((mega_inquiry3 *)inquiry)->rebuild_rate);
        else
                seq_printf(m, "Rebuild Rate: [%d%%]\n",
                        ((mraid_ext_inquiry *)
                         inquiry)->raid_inq.adapter_info.rebuild_rate);

free_inquiry:
        mega_free_inquiry(inquiry, dma_handle, pdev);
free_pdev:
        free_local_pdev(pdev);
        return 0;
}


/**
 * proc_show_battery()
 * @m - Synthetic file construction data
 * @v - File iterator
 *
 * Display information about the battery module on the controller.
 */
static int
proc_show_battery(struct seq_file *m, void *v)
{
        adapter_t       *adapter = m->private;
        dma_addr_t      dma_handle;
        caddr_t         inquiry;
        struct pci_dev  *pdev;
        u8      battery_status;

        if( make_local_pdev(adapter, &pdev) != 0 )
                return 0;

        if( (inquiry = mega_allocate_inquiry(&dma_handle, pdev)) == NULL )
                goto free_pdev;

        if( mega_adapinq(adapter, dma_handle) != 0 ) {
                seq_puts(m, "Adapter inquiry failed.\n");
                dev_warn(&adapter->dev->dev, "inquiry failed\n");
                goto free_inquiry;
        }

        if( adapter->flag & BOARD_40LD ) {
                battery_status = ((mega_inquiry3 *)inquiry)->battery_status;
        }
        else {
                battery_status = ((mraid_ext_inquiry *)inquiry)->
                        raid_inq.adapter_info.battery_status;
        }

        /*
         * Decode the battery status
         */
        seq_printf(m, "Battery Status:[%d]", battery_status);

        if(battery_status == MEGA_BATT_CHARGE_DONE)
                seq_puts(m, " Charge Done");

        if(battery_status & MEGA_BATT_MODULE_MISSING)
                seq_puts(m, " Module Missing");
        
        if(battery_status & MEGA_BATT_LOW_VOLTAGE)
                seq_puts(m, " Low Voltage");
        
        if(battery_status & MEGA_BATT_TEMP_HIGH)
                seq_puts(m, " Temperature High");
        
        if(battery_status & MEGA_BATT_PACK_MISSING)
                seq_puts(m, " Pack Missing");
        
        if(battery_status & MEGA_BATT_CHARGE_INPROG)
                seq_puts(m, " Charge In-progress");
        
        if(battery_status & MEGA_BATT_CHARGE_FAIL)
                seq_puts(m, " Charge Fail");
        
        if(battery_status & MEGA_BATT_CYCLES_EXCEEDED)
                seq_puts(m, " Cycles Exceeded");

        seq_putc(m, '\n');

free_inquiry:
        mega_free_inquiry(inquiry, dma_handle, pdev);
free_pdev:
        free_local_pdev(pdev);
        return 0;
}


/*
 * Display scsi inquiry
 */
static void
mega_print_inquiry(struct seq_file *m, char *scsi_inq)
{
        int     i;

        seq_puts(m, "  Vendor: ");
        seq_write(m, scsi_inq + 8, 8);
        seq_puts(m, "  Model: ");
        seq_write(m, scsi_inq + 16, 16);
        seq_puts(m, "  Rev: ");
        seq_write(m, scsi_inq + 32, 4);
        seq_putc(m, '\n');

        i = scsi_inq[0] & 0x1f;
        seq_printf(m, "  Type:   %s ", scsi_device_type(i));

        seq_printf(m, "                 ANSI SCSI revision: %02x",
                   scsi_inq[2] & 0x07);

        if( (scsi_inq[2] & 0x07) == 1 && (scsi_inq[3] & 0x0f) == 1 )
                seq_puts(m, " CCS\n");
        else
                seq_putc(m, '\n');
}

/**
 * proc_show_pdrv()
 * @m - Synthetic file construction data
 * @page - buffer to write the data in
 * @adapter - pointer to our soft state
 *
 * Display information about the physical drives.
 */
static int
proc_show_pdrv(struct seq_file *m, adapter_t *adapter, int channel)
{
        dma_addr_t      dma_handle;
        char            *scsi_inq;
        dma_addr_t      scsi_inq_dma_handle;
        caddr_t         inquiry;
        struct pci_dev  *pdev;
        u8      *pdrv_state;
        u8      state;
        int     tgt;
        int     max_channels;
        int     i;

        if( make_local_pdev(adapter, &pdev) != 0 )
                return 0;

        if( (inquiry = mega_allocate_inquiry(&dma_handle, pdev)) == NULL )
                goto free_pdev;

        if( mega_adapinq(adapter, dma_handle) != 0 ) {
                seq_puts(m, "Adapter inquiry failed.\n");
                dev_warn(&adapter->dev->dev, "inquiry failed\n");
                goto free_inquiry;
        }


        scsi_inq = pci_alloc_consistent(pdev, 256, &scsi_inq_dma_handle);
        if( scsi_inq == NULL ) {
                seq_puts(m, "memory not available for scsi inq.\n");
                goto free_inquiry;
        }

        if( adapter->flag & BOARD_40LD ) {
                pdrv_state = ((mega_inquiry3 *)inquiry)->pdrv_state;
        }
        else {
                pdrv_state = ((mraid_ext_inquiry *)inquiry)->
                        raid_inq.pdrv_info.pdrv_state;
        }

        max_channels = adapter->product_info.nchannels;

        if( channel >= max_channels ) {
                goto free_pci;
        }

        for( tgt = 0; tgt <= MAX_TARGET; tgt++ ) {

                i = channel*16 + tgt;

                state = *(pdrv_state + i);
                switch( state & 0x0F ) {
                case PDRV_ONLINE:
                        seq_printf(m, "Channel:%2d Id:%2d State: Online",
                                   channel, tgt);
                        break;

                case PDRV_FAILED:
                        seq_printf(m, "Channel:%2d Id:%2d State: Failed",
                                   channel, tgt);
                        break;

                case PDRV_RBLD:
                        seq_printf(m, "Channel:%2d Id:%2d State: Rebuild",
                                   channel, tgt);
                        break;

                case PDRV_HOTSPARE:
                        seq_printf(m, "Channel:%2d Id:%2d State: Hot spare",
                                   channel, tgt);
                        break;

                default:
                        seq_printf(m, "Channel:%2d Id:%2d State: Un-configured",
                                   channel, tgt);
                        break;
                }

                /*
                 * This interface displays inquiries for disk drives
                 * only. Inquries for logical drives and non-disk
                 * devices are available through /proc/scsi/scsi
                 */
                memset(scsi_inq, 0, 256);
                if( mega_internal_dev_inquiry(adapter, channel, tgt,
                                scsi_inq_dma_handle) ||
                                (scsi_inq[0] & 0x1F) != TYPE_DISK ) {
                        continue;
                }

                /*
                 * Check for overflow. We print less than 240
                 * characters for inquiry
                 */
                seq_puts(m, ".\n");
                mega_print_inquiry(m, scsi_inq);
        }

free_pci:
        pci_free_consistent(pdev, 256, scsi_inq, scsi_inq_dma_handle);
free_inquiry:
        mega_free_inquiry(inquiry, dma_handle, pdev);
free_pdev:
        free_local_pdev(pdev);
        return 0;
}

/**
 * proc_show_pdrv_ch0()
 * @m - Synthetic file construction data
 * @v - File iterator
 *
 * Display information about the physical drives on physical channel 0.
 */
static int
proc_show_pdrv_ch0(struct seq_file *m, void *v)
{
        return proc_show_pdrv(m, m->private, 0);
}


/**
 * proc_show_pdrv_ch1()
 * @m - Synthetic file construction data
 * @v - File iterator
 *
 * Display information about the physical drives on physical channel 1.
 */
static int
proc_show_pdrv_ch1(struct seq_file *m, void *v)
{
        return proc_show_pdrv(m, m->private, 1);
}


/**
 * proc_show_pdrv_ch2()
 * @m - Synthetic file construction data
 * @v - File iterator
 *
 * Display information about the physical drives on physical channel 2.
 */
static int
proc_show_pdrv_ch2(struct seq_file *m, void *v)
{
        return proc_show_pdrv(m, m->private, 2);
}


/**
 * proc_show_pdrv_ch3()
 * @m - Synthetic file construction data
 * @v - File iterator
 *
 * Display information about the physical drives on physical channel 3.
 */
static int
proc_show_pdrv_ch3(struct seq_file *m, void *v)
{
        return proc_show_pdrv(m, m->private, 3);
}


/**
 * proc_show_rdrv()
 * @m - Synthetic file construction data
 * @adapter - pointer to our soft state
 * @start - starting logical drive to display
 * @end - ending logical drive to display
 *
 * We do not print the inquiry information since its already available through
 * /proc/scsi/scsi interface
 */
static int
proc_show_rdrv(struct seq_file *m, adapter_t *adapter, int start, int end )
{
        dma_addr_t      dma_handle;
        logdrv_param    *lparam;
        megacmd_t       mc;
        char            *disk_array;
        dma_addr_t      disk_array_dma_handle;
        caddr_t         inquiry;
        struct pci_dev  *pdev;
        u8      *rdrv_state;
        int     num_ldrv;
        u32     array_sz;
        int     i;

        if( make_local_pdev(adapter, &pdev) != 0 )
                return 0;

        if( (inquiry = mega_allocate_inquiry(&dma_handle, pdev)) == NULL )
                goto free_pdev;

        if( mega_adapinq(adapter, dma_handle) != 0 ) {
                seq_puts(m, "Adapter inquiry failed.\n");
                dev_warn(&adapter->dev->dev, "inquiry failed\n");
                goto free_inquiry;
        }

        memset(&mc, 0, sizeof(megacmd_t));

        if( adapter->flag & BOARD_40LD ) {
                array_sz = sizeof(disk_array_40ld);

                rdrv_state = ((mega_inquiry3 *)inquiry)->ldrv_state;

                num_ldrv = ((mega_inquiry3 *)inquiry)->num_ldrv;
        }
        else {
                array_sz = sizeof(disk_array_8ld);

                rdrv_state = ((mraid_ext_inquiry *)inquiry)->
                        raid_inq.logdrv_info.ldrv_state;

                num_ldrv = ((mraid_ext_inquiry *)inquiry)->
                        raid_inq.logdrv_info.num_ldrv;
        }

        disk_array = pci_alloc_consistent(pdev, array_sz,
                        &disk_array_dma_handle);

        if( disk_array == NULL ) {
                seq_puts(m, "memory not available.\n");
                goto free_inquiry;
        }

        mc.xferaddr = (u32)disk_array_dma_handle;

        if( adapter->flag & BOARD_40LD ) {
                mc.cmd = FC_NEW_CONFIG;
                mc.opcode = OP_DCMD_READ_CONFIG;

                if( mega_internal_command(adapter, &mc, NULL) ) {
                        seq_puts(m, "40LD read config failed.\n");
                        goto free_pci;
                }

        }
        else {
                mc.cmd = NEW_READ_CONFIG_8LD;

                if( mega_internal_command(adapter, &mc, NULL) ) {
                        mc.cmd = READ_CONFIG_8LD;
                        if( mega_internal_command(adapter, &mc, NULL) ) {
                                seq_puts(m, "8LD read config failed.\n");
                                goto free_pci;
                        }
                }
        }

        for( i = start; i < ( (end+1 < num_ldrv) ? end+1 : num_ldrv ); i++ ) {

                if( adapter->flag & BOARD_40LD ) {
                        lparam =
                        &((disk_array_40ld *)disk_array)->ldrv[i].lparam;
                }
                else {
                        lparam =
                        &((disk_array_8ld *)disk_array)->ldrv[i].lparam;
                }

                /*
                 * Check for overflow. We print less than 240 characters for
                 * information about each logical drive.
                 */
                seq_printf(m, "Logical drive:%2d:, ", i);

                switch( rdrv_state[i] & 0x0F ) {
                case RDRV_OFFLINE:
                        seq_puts(m, "state: offline");
                        break;
                case RDRV_DEGRADED:
                        seq_puts(m, "state: degraded");
                        break;
                case RDRV_OPTIMAL:
                        seq_puts(m, "state: optimal");
                        break;
                case RDRV_DELETED:
                        seq_puts(m, "state: deleted");
                        break;
                default:
                        seq_puts(m, "state: unknown");
                        break;
                }

                /*
                 * Check if check consistency or initialization is going on
                 * for this logical drive.
                 */
                if( (rdrv_state[i] & 0xF0) == 0x20 )
                        seq_puts(m, ", check-consistency in progress");
                else if( (rdrv_state[i] & 0xF0) == 0x10 )
                        seq_puts(m, ", initialization in progress");
                
                seq_putc(m, '\n');

                seq_printf(m, "Span depth:%3d, ", lparam->span_depth);
                seq_printf(m, "RAID level:%3d, ", lparam->level);
                seq_printf(m, "Stripe size:%3d, ",
                           lparam->stripe_sz ? lparam->stripe_sz/2: 128);
                seq_printf(m, "Row size:%3d\n", lparam->row_size);

                seq_puts(m, "Read Policy: ");
                switch(lparam->read_ahead) {
                case NO_READ_AHEAD:
                        seq_puts(m, "No read ahead, ");
                        break;
                case READ_AHEAD:
                        seq_puts(m, "Read ahead, ");
                        break;
                case ADAP_READ_AHEAD:
                        seq_puts(m, "Adaptive, ");
                        break;

                }

                seq_puts(m, "Write Policy: ");
                switch(lparam->write_mode) {
                case WRMODE_WRITE_THRU:
                        seq_puts(m, "Write thru, ");
                        break;
                case WRMODE_WRITE_BACK:
                        seq_puts(m, "Write back, ");
                        break;
                }

                seq_puts(m, "Cache Policy: ");
                switch(lparam->direct_io) {
                case CACHED_IO:
                        seq_puts(m, "Cached IO\n\n");
                        break;
                case DIRECT_IO:
                        seq_puts(m, "Direct IO\n\n");
                        break;
                }
        }

free_pci:
        pci_free_consistent(pdev, array_sz, disk_array,
                        disk_array_dma_handle);
free_inquiry:
        mega_free_inquiry(inquiry, dma_handle, pdev);
free_pdev:
        free_local_pdev(pdev);
        return 0;
}

/**
 * proc_show_rdrv_10()
 * @m - Synthetic file construction data
 * @v - File iterator
 *
 * Display real time information about the logical drives 0 through 9.
 */
static int
proc_show_rdrv_10(struct seq_file *m, void *v)
{
        return proc_show_rdrv(m, m->private, 0, 9);
}


/**
 * proc_show_rdrv_20()
 * @m - Synthetic file construction data
 * @v - File iterator
 *
 * Display real time information about the logical drives 0 through 9.
 */
static int
proc_show_rdrv_20(struct seq_file *m, void *v)
{
        return proc_show_rdrv(m, m->private, 10, 19);
}


/**
 * proc_show_rdrv_30()
 * @m - Synthetic file construction data
 * @v - File iterator
 *
 * Display real time information about the logical drives 0 through 9.
 */
static int
proc_show_rdrv_30(struct seq_file *m, void *v)
{
        return proc_show_rdrv(m, m->private, 20, 29);
}


/**
 * proc_show_rdrv_40()
 * @m - Synthetic file construction data
 * @v - File iterator
 *
 * Display real time information about the logical drives 0 through 9.
 */
static int
proc_show_rdrv_40(struct seq_file *m, void *v)
{
        return proc_show_rdrv(m, m->private, 30, 39);
}

/**
 * mega_create_proc_entry()
 * @index - index in soft state array
 * @parent - parent node for this /proc entry
 *
 * Creates /proc entries for our controllers.
 */
static void
mega_create_proc_entry(int index, struct proc_dir_entry *parent)
{
        adapter_t *adapter = hba_soft_state[index];
        struct proc_dir_entry *dir;
        u8 string[16];

        sprintf(string, "hba%d", adapter->host->host_no);
        dir = proc_mkdir_data(string, 0, parent, adapter);
        if (!dir) {
                dev_warn(&adapter->dev->dev, "proc_mkdir failed\n");
                return;
        }

        proc_create_single_data("config", S_IRUSR, dir,
                        proc_show_config, adapter);
        proc_create_single_data("stat", S_IRUSR, dir,
                        proc_show_stat, adapter);
        proc_create_single_data("mailbox", S_IRUSR, dir,
                        proc_show_mbox, adapter);
#if MEGA_HAVE_ENH_PROC
        proc_create_single_data("rebuild-rate", S_IRUSR, dir,
                        proc_show_rebuild_rate, adapter);
        proc_create_single_data("battery-status", S_IRUSR, dir,
                        proc_show_battery, adapter);
        proc_create_single_data("diskdrives-ch0", S_IRUSR, dir,
                        proc_show_pdrv_ch0, adapter);
        proc_create_single_data("diskdrives-ch1", S_IRUSR, dir,
                        proc_show_pdrv_ch1, adapter);
        proc_create_single_data("diskdrives-ch2", S_IRUSR, dir,
                        proc_show_pdrv_ch2, adapter);
        proc_create_single_data("diskdrives-ch3", S_IRUSR, dir,
                        proc_show_pdrv_ch3, adapter);
        proc_create_single_data("raiddrives-0-9", S_IRUSR, dir,
                        proc_show_rdrv_10, adapter);
        proc_create_single_data("raiddrives-10-19", S_IRUSR, dir,
                        proc_show_rdrv_20, adapter);
        proc_create_single_data("raiddrives-20-29", S_IRUSR, dir,
                        proc_show_rdrv_30, adapter);
        proc_create_single_data("raiddrives-30-39", S_IRUSR, dir,
                        proc_show_rdrv_40, adapter);
#endif
}

#else
static inline void mega_create_proc_entry(int index, struct proc_dir_entry *parent)
{
}
#endif


/**
 * megaraid_biosparam()
 *
 * Return the disk geometry for a particular disk
 */
static int
megaraid_biosparam(struct scsi_device *sdev, struct block_device *bdev,
                    sector_t capacity, int geom[])
{
        adapter_t       *adapter;
        unsigned char   *bh;
        int     heads;
        int     sectors;
        int     cylinders;
        int     rval;

        /* Get pointer to host config structure */
        adapter = (adapter_t *)sdev->host->hostdata;

        if (IS_RAID_CH(adapter, sdev->channel)) {
                        /* Default heads (64) & sectors (32) */
                        heads = 64;
                        sectors = 32;
                        cylinders = (ulong)capacity / (heads * sectors);

                        /*
                         * Handle extended translation size for logical drives
                         * > 1Gb
                         */
                        if ((ulong)capacity >= 0x200000) {
                                heads = 255;
                                sectors = 63;
                                cylinders = (ulong)capacity / (heads * sectors);
                        }

                        /* return result */
                        geom[0] = heads;
                        geom[1] = sectors;
                        geom[2] = cylinders;
        }
        else {
                bh = scsi_bios_ptable(bdev);

                if( bh ) {
                        rval = scsi_partsize(bh, capacity,
                                            &geom[2], &geom[0], &geom[1]);
                        kfree(bh);
                        if( rval != -1 )
                                return rval;
                }

                dev_info(&adapter->dev->dev,
                         "invalid partition on this disk on channel %d\n",
                         sdev->channel);

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

                /* Handle extended translation size for logical drives > 1Gb */
                if ((ulong)capacity >= 0x200000) {
                        heads = 255;
                        sectors = 63;
                        cylinders = (ulong)capacity / (heads * sectors);
                }

                /* return result */
                geom[0] = heads;
                geom[1] = sectors;
                geom[2] = cylinders;
        }

        return 0;
}

/**
 * mega_init_scb()
 * @adapter - pointer to our soft state
 *
 * Allocate memory for the various pointers in the scb structures:
 * scatter-gather list pointer, passthru and extended passthru structure
 * pointers.
 */
static int
mega_init_scb(adapter_t *adapter)
{
        scb_t   *scb;
        int     i;

        for( i = 0; i < adapter->max_cmds; i++ ) {

                scb = &adapter->scb_list[i];

                scb->sgl64 = NULL;
                scb->sgl = NULL;
                scb->pthru = NULL;
                scb->epthru = NULL;
        }

        for( i = 0; i < adapter->max_cmds; i++ ) {

                scb = &adapter->scb_list[i];

                scb->idx = i;

                scb->sgl64 = pci_alloc_consistent(adapter->dev,
                                sizeof(mega_sgl64) * adapter->sglen,
                                &scb->sgl_dma_addr);

                scb->sgl = (mega_sglist *)scb->sgl64;

                if( !scb->sgl ) {
                        dev_warn(&adapter->dev->dev, "RAID: Can't allocate sglist\n");
                        mega_free_sgl(adapter);
                        return -1;
                }

                scb->pthru = pci_alloc_consistent(adapter->dev,
                                sizeof(mega_passthru),
                                &scb->pthru_dma_addr);

                if( !scb->pthru ) {
                        dev_warn(&adapter->dev->dev, "RAID: Can't allocate passthru\n");
                        mega_free_sgl(adapter);
                        return -1;
                }

                scb->epthru = pci_alloc_consistent(adapter->dev,
                                sizeof(mega_ext_passthru),
                                &scb->epthru_dma_addr);

                if( !scb->epthru ) {
                        dev_warn(&adapter->dev->dev,
                                "Can't allocate extended passthru\n");
                        mega_free_sgl(adapter);
                        return -1;
                }


                scb->dma_type = MEGA_DMA_TYPE_NONE;

                /*
                 * Link to free list
                 * lock not required since we are loading the driver, so no
                 * commands possible right now.
                 */
                scb->state = SCB_FREE;
                scb->cmd = NULL;
                list_add(&scb->list, &adapter->free_list);
        }

        return 0;
}


/**
 * megadev_open()
 * @inode - unused
 * @filep - unused
 *
 * Routines for the character/ioctl interface to the driver. Find out if this
 * is a valid open. 
 */
static int
megadev_open (struct inode *inode, struct file *filep)
{
        /*
         * Only allow superuser to access private ioctl interface
         */
        if( !capable(CAP_SYS_ADMIN) ) return -EACCES;

        return 0;
}


/**
 * megadev_ioctl()
 * @inode - Our device inode
 * @filep - unused
 * @cmd - ioctl command
 * @arg - user buffer
 *
 * ioctl entry point for our private ioctl interface. We move the data in from
 * the user space, prepare the command (if necessary, convert the old MIMD
 * ioctl to new ioctl command), and issue a synchronous command to the
 * controller.
 */
static int
megadev_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
{
        adapter_t       *adapter;
        nitioctl_t      uioc;
        int             adapno;
        int             rval;
        mega_passthru   __user *upthru; /* user address for passthru */
        mega_passthru   *pthru;         /* copy user passthru here */
        dma_addr_t      pthru_dma_hndl;
        void            *data = NULL;   /* data to be transferred */
        dma_addr_t      data_dma_hndl;  /* dma handle for data xfer area */
        megacmd_t       mc;
        megastat_t      __user *ustats;
        int             num_ldrv;
        u32             uxferaddr = 0;
        struct pci_dev  *pdev;

        ustats = NULL; /* avoid compilation warnings */
        num_ldrv = 0;

        /*
         * Make sure only USCSICMD are issued through this interface.
         * MIMD application would still fire different command.
         */

        if( (_IOC_TYPE(cmd) != MEGAIOC_MAGIC) && (cmd != USCSICMD) ) {
                return -EINVAL;
        }

        /*
         * Check and convert a possible MIMD command to NIT command.
         * mega_m_to_n() copies the data from the user space, so we do not
         * have to do it here.
         * NOTE: We will need some user address to copyout the data, therefore
         * the inteface layer will also provide us with the required user
         * addresses.
         */
        memset(&uioc, 0, sizeof(nitioctl_t));
        if( (rval = mega_m_to_n( (void __user *)arg, &uioc)) != 0 )
                return rval;


        switch( uioc.opcode ) {

        case GET_DRIVER_VER:
                if( put_user(driver_ver, (u32 __user *)uioc.uioc_uaddr) )
                        return (-EFAULT);

                break;

        case GET_N_ADAP:
                if( put_user(hba_count, (u32 __user *)uioc.uioc_uaddr) )
                        return (-EFAULT);

                /*
                 * Shucks. MIMD interface returns a positive value for number
                 * of adapters. TODO: Change it to return 0 when there is no
                 * applicatio using mimd interface.
                 */
                return hba_count;

        case GET_ADAP_INFO:

                /*
                 * Which adapter
                 */
                if( (adapno = GETADAP(uioc.adapno)) >= hba_count )
                        return (-ENODEV);

                if( copy_to_user(uioc.uioc_uaddr, mcontroller+adapno,
                                sizeof(struct mcontroller)) )
                        return (-EFAULT);
                break;

#if MEGA_HAVE_STATS

        case GET_STATS:
                /*
                 * Which adapter
                 */
                if( (adapno = GETADAP(uioc.adapno)) >= hba_count )
                        return (-ENODEV);

                adapter = hba_soft_state[adapno];

                ustats = uioc.uioc_uaddr;

                if( copy_from_user(&num_ldrv, &ustats->num_ldrv, sizeof(int)) )
                        return (-EFAULT);

                /*
                 * Check for the validity of the logical drive number
                 */
                if( num_ldrv >= MAX_LOGICAL_DRIVES_40LD ) return -EINVAL;

                if( copy_to_user(ustats->nreads, adapter->nreads,
                                        num_ldrv*sizeof(u32)) )
                        return -EFAULT;

                if( copy_to_user(ustats->nreadblocks, adapter->nreadblocks,
                                        num_ldrv*sizeof(u32)) )
                        return -EFAULT;

                if( copy_to_user(ustats->nwrites, adapter->nwrites,
                                        num_ldrv*sizeof(u32)) )
                        return -EFAULT;

                if( copy_to_user(ustats->nwriteblocks, adapter->nwriteblocks,
                                        num_ldrv*sizeof(u32)) )
                        return -EFAULT;

                if( copy_to_user(ustats->rd_errors, adapter->rd_errors,
                                        num_ldrv*sizeof(u32)) )
                        return -EFAULT;

                if( copy_to_user(ustats->wr_errors, adapter->wr_errors,
                                        num_ldrv*sizeof(u32)) )
                        return -EFAULT;

                return 0;

#endif
        case MBOX_CMD:

                /*
                 * Which adapter
                 */
                if( (adapno = GETADAP(uioc.adapno)) >= hba_count )
                        return (-ENODEV);

                adapter = hba_soft_state[adapno];

                /*
                 * Deletion of logical drive is a special case. The adapter
                 * should be quiescent before this command is issued.
                 */
                if( uioc.uioc_rmbox[0] == FC_DEL_LOGDRV &&
                                uioc.uioc_rmbox[2] == OP_DEL_LOGDRV ) {

                        /*
                         * Do we support this feature
                         */
                        if( !adapter->support_random_del ) {
                                dev_warn(&adapter->dev->dev, "logdrv "
                                        "delete on non-supporting F/W\n");

                                return (-EINVAL);
                        }

                        rval = mega_del_logdrv( adapter, uioc.uioc_rmbox[3] );

                        if( rval == 0 ) {
                                memset(&mc, 0, sizeof(megacmd_t));

                                mc.status = rval;

                                rval = mega_n_to_m((void __user *)arg, &mc);
                        }

                        return rval;
                }
                /*
                 * This interface only support the regular passthru commands.
                 * Reject extended passthru and 64-bit passthru
                 */
                if( uioc.uioc_rmbox[0] == MEGA_MBOXCMD_PASSTHRU64 ||
                        uioc.uioc_rmbox[0] == MEGA_MBOXCMD_EXTPTHRU ) {

                        dev_warn(&adapter->dev->dev, "rejected passthru\n");

                        return (-EINVAL);
                }

                /*
                 * For all internal commands, the buffer must be allocated in
                 * <4GB address range
                 */
                if( make_local_pdev(adapter, &pdev) != 0 )
                        return -EIO;

                /* Is it a passthru command or a DCMD */
                if( uioc.uioc_rmbox[0] == MEGA_MBOXCMD_PASSTHRU ) {
                        /* Passthru commands */

                        pthru = pci_alloc_consistent(pdev,
                                        sizeof(mega_passthru),
                                        &pthru_dma_hndl);

                        if( pthru == NULL ) {
                                free_local_pdev(pdev);
                                return (-ENOMEM);
                        }

                        /*
                         * The user passthru structure
                         */
                        upthru = (mega_passthru __user *)(unsigned long)MBOX(uioc)->xferaddr;

                        /*
                         * Copy in the user passthru here.
                         */
                        if( copy_from_user(pthru, upthru,
                                                sizeof(mega_passthru)) ) {

                                pci_free_consistent(pdev,
                                                sizeof(mega_passthru), pthru,
                                                pthru_dma_hndl);

                                free_local_pdev(pdev);

                                return (-EFAULT);
                        }

                        /*
                         * Is there a data transfer
                         */
                        if( pthru->dataxferlen ) {
                                data = pci_alloc_consistent(pdev,
                                                pthru->dataxferlen,
                                                &data_dma_hndl);

                                if( data == NULL ) {
                                        pci_free_consistent(pdev,
                                                        sizeof(mega_passthru),
                                                        pthru,
                                                        pthru_dma_hndl);

                                        free_local_pdev(pdev);

                                        return (-ENOMEM);
                                }

                                /*
                                 * Save the user address and point the kernel
                                 * address at just allocated memory
                                 */
                                uxferaddr = pthru->dataxferaddr;
                                pthru->dataxferaddr = data_dma_hndl;
                        }


                        /*
                         * Is data coming down-stream
                         */
                        if( pthru->dataxferlen && (uioc.flags & UIOC_WR) ) {
                                /*
                                 * Get the user data
                                 */
                                if( copy_from_user(data, (char __user *)(unsigned long) uxferaddr,
                                                        pthru->dataxferlen) ) {
                                        rval = (-EFAULT);
                                        goto freemem_and_return;
                                }
                        }

                        memset(&mc, 0, sizeof(megacmd_t));

                        mc.cmd = MEGA_MBOXCMD_PASSTHRU;
                        mc.xferaddr = (u32)pthru_dma_hndl;

                        /*
                         * Issue the command
                         */
                        mega_internal_command(adapter, &mc, pthru);

                        rval = mega_n_to_m((void __user *)arg, &mc);

                        if( rval ) goto freemem_and_return;


                        /*
                         * Is data going up-stream
                         */
                        if( pthru->dataxferlen && (uioc.flags & UIOC_RD) ) {
                                if( copy_to_user((char __user *)(unsigned long) uxferaddr, data,
                                                        pthru->dataxferlen) ) {
                                        rval = (-EFAULT);
                                }
                        }

                        /*
                         * Send the request sense data also, irrespective of
                         * whether the user has asked for it or not.
                         */
                        if (copy_to_user(upthru->reqsensearea,
                                        pthru->reqsensearea, 14))
                                rval = -EFAULT;

freemem_and_return:
                        if( pthru->dataxferlen ) {
                                pci_free_consistent(pdev,
                                                pthru->dataxferlen, data,
                                                data_dma_hndl);
                        }

                        pci_free_consistent(pdev, sizeof(mega_passthru),
                                        pthru, pthru_dma_hndl);

                        free_local_pdev(pdev);

                        return rval;
                }
                else {
                        /* DCMD commands */

                        /*
                         * Is there a data transfer
                         */
                        if( uioc.xferlen ) {
                                data = pci_alloc_consistent(pdev,
                                                uioc.xferlen, &data_dma_hndl);

                                if( data == NULL ) {
                                        free_local_pdev(pdev);
                                        return (-ENOMEM);
                                }

                                uxferaddr = MBOX(uioc)->xferaddr;
                        }

                        /*
                         * Is data coming down-stream
                         */
                        if( uioc.xferlen && (uioc.flags & UIOC_WR) ) {
                                /*
                                 * Get the user data
                                 */
                                if( copy_from_user(data, (char __user *)(unsigned long) uxferaddr,
                                                        uioc.xferlen) ) {

                                        pci_free_consistent(pdev,
                                                        uioc.xferlen,
                                                        data, data_dma_hndl);

                                        free_local_pdev(pdev);

                                        return (-EFAULT);
                                }
                        }

                        memcpy(&mc, MBOX(uioc), sizeof(megacmd_t));

                        mc.xferaddr = (u32)data_dma_hndl;

                        /*
                         * Issue the command
                         */
                        mega_internal_command(adapter, &mc, NULL);

                        rval = mega_n_to_m((void __user *)arg, &mc);

                        if( rval ) {
                                if( uioc.xferlen ) {
                                        pci_free_consistent(pdev,
                                                        uioc.xferlen, data,
                                                        data_dma_hndl);
                                }

                                free_local_pdev(pdev);

                                return rval;
                        }

                        /*
                         * Is data going up-stream
                         */
                        if( uioc.xferlen && (uioc.flags & UIOC_RD) ) {
                                if( copy_to_user((char __user *)(unsigned long) uxferaddr, data,
                                                        uioc.xferlen) ) {

                                        rval = (-EFAULT);
                                }
                        }

                        if( uioc.xferlen ) {
                                pci_free_consistent(pdev,
                                                uioc.xferlen, data,
                                                data_dma_hndl);
                        }

                        free_local_pdev(pdev);

                        return rval;
                }

        default:
                return (-EINVAL);
        }

        return 0;
}

static long
megadev_unlocked_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
{
        int ret;

        mutex_lock(&megadev_mutex);
        ret = megadev_ioctl(filep, cmd, arg);
        mutex_unlock(&megadev_mutex);

        return ret;
}

/**
 * mega_m_to_n()
 * @arg - user address
 * @uioc - new ioctl structure
 *
 * A thin layer to convert older mimd interface ioctl structure to NIT ioctl
 * structure
 *
 * Converts the older mimd ioctl structure to newer NIT structure
 */
static int
mega_m_to_n(void __user *arg, nitioctl_t *uioc)
{
        struct uioctl_t uioc_mimd;
        char    signature[8] = {0};
        u8      opcode;
        u8      subopcode;


        /*
         * check is the application conforms to NIT. We do not have to do much
         * in that case.
         * We exploit the fact that the signature is stored in the very
         * beginning of the structure.
         */

        if( copy_from_user(signature, arg, 7) )
                return (-EFAULT);

        if( memcmp(signature, "MEGANIT", 7) == 0 ) {

                /*
                 * NOTE NOTE: The nit ioctl is still under flux because of
                 * change of mailbox definition, in HPE. No applications yet
                 * use this interface and let's not have applications use this
                 * interface till the new specifitions are in place.
                 */
                return -EINVAL;
#if 0
                if( copy_from_user(uioc, arg, sizeof(nitioctl_t)) )
                        return (-EFAULT);
                return 0;
#endif
        }

        /*
         * Else assume we have mimd uioctl_t as arg. Convert to nitioctl_t
         *
         * Get the user ioctl structure
         */
        if( copy_from_user(&uioc_mimd, arg, sizeof(struct uioctl_t)) )
                return (-EFAULT);


        /*
         * Get the opcode and subopcode for the commands
         */
        opcode = uioc_mimd.ui.fcs.opcode;
        subopcode = uioc_mimd.ui.fcs.subopcode;

        switch (opcode) {
        case 0x82:

                switch (subopcode) {

                case MEGAIOC_QDRVRVER:  /* Query driver version */
                        uioc->opcode = GET_DRIVER_VER;
                        uioc->uioc_uaddr = uioc_mimd.data;
                        break;

                case MEGAIOC_QNADAP:    /* Get # of adapters */
                        uioc->opcode = GET_N_ADAP;
                        uioc->uioc_uaddr = uioc_mimd.data;
                        break;

                case MEGAIOC_QADAPINFO: /* Get adapter information */
                        uioc->opcode = GET_ADAP_INFO;
                        uioc->adapno = uioc_mimd.ui.fcs.adapno;
                        uioc->uioc_uaddr = uioc_mimd.data;
                        break;

                default:
                        return(-EINVAL);
                }

                break;


        case 0x81:

                uioc->opcode = MBOX_CMD;
                uioc->adapno = uioc_mimd.ui.fcs.adapno;

                memcpy(uioc->uioc_rmbox, uioc_mimd.mbox, 18);

                uioc->xferlen = uioc_mimd.ui.fcs.length;

                if( uioc_mimd.outlen ) uioc->flags = UIOC_RD;
                if( uioc_mimd.inlen ) uioc->flags |= UIOC_WR;

                break;

        case 0x80:

                uioc->opcode = MBOX_CMD;
                uioc->adapno = uioc_mimd.ui.fcs.adapno;

                memcpy(uioc->uioc_rmbox, uioc_mimd.mbox, 18);

                /*
                 * Choose the xferlen bigger of input and output data
                 */
                uioc->xferlen = uioc_mimd.outlen > uioc_mimd.inlen ?
                        uioc_mimd.outlen : uioc_mimd.inlen;

                if( uioc_mimd.outlen ) uioc->flags = UIOC_RD;
                if( uioc_mimd.inlen ) uioc->flags |= UIOC_WR;

                break;

        default:
                return (-EINVAL);

        }

        return 0;
}

/*
 * mega_n_to_m()
 * @arg - user address
 * @mc - mailbox command
 *
 * Updates the status information to the application, depending on application
 * conforms to older mimd ioctl interface or newer NIT ioctl interface
 */
static int
mega_n_to_m(void __user *arg, megacmd_t *mc)
{
        nitioctl_t      __user *uiocp;
        megacmd_t       __user *umc;
        mega_passthru   __user *upthru;
        struct uioctl_t __user *uioc_mimd;
        char    signature[8] = {0};

        /*
         * check is the application conforms to NIT.
         */
        if( copy_from_user(signature, arg, 7) )
                return -EFAULT;

        if( memcmp(signature, "MEGANIT", 7) == 0 ) {

                uiocp = arg;

                if( put_user(mc->status, (u8 __user *)&MBOX_P(uiocp)->status) )
                        return (-EFAULT);

                if( mc->cmd == MEGA_MBOXCMD_PASSTHRU ) {

                        umc = MBOX_P(uiocp);

                        if (get_user(upthru, (mega_passthru __user * __user *)&umc->xferaddr))
                                return -EFAULT;

                        if( put_user(mc->status, (u8 __user *)&upthru->scsistatus))
                                return (-EFAULT);
                }
        }
        else {
                uioc_mimd = arg;

                if( put_user(mc->status, (u8 __user *)&uioc_mimd->mbox[17]) )
                        return (-EFAULT);

                if( mc->cmd == MEGA_MBOXCMD_PASSTHRU ) {

                        umc = (megacmd_t __user *)uioc_mimd->mbox;

                        if (get_user(upthru, (mega_passthru __user * __user *)&umc->xferaddr))
                                return (-EFAULT);

                        if( put_user(mc->status, (u8 __user *)&upthru->scsistatus) )
                                return (-EFAULT);
                }
        }

        return 0;
}


/*
 * MEGARAID 'FW' commands.
 */

/**
 * mega_is_bios_enabled()
 * @adapter - pointer to our soft state
 *
 * issue command to find out if the BIOS is enabled for this controller
 */
static int
mega_is_bios_enabled(adapter_t *adapter)
{
        unsigned char   raw_mbox[sizeof(struct mbox_out)];
        mbox_t  *mbox;
        int     ret;

        mbox = (mbox_t *)raw_mbox;

        memset(&mbox->m_out, 0, sizeof(raw_mbox));

        memset((void *)adapter->mega_buffer, 0, MEGA_BUFFER_SIZE);

        mbox->m_out.xferaddr = (u32)adapter->buf_dma_handle;

        raw_mbox[0] = IS_BIOS_ENABLED;
        raw_mbox[2] = GET_BIOS;


        ret = issue_scb_block(adapter, raw_mbox);

        return *(char *)adapter->mega_buffer;
}


/**
 * mega_enum_raid_scsi()
 * @adapter - pointer to our soft state
 *
 * Find out what channels are RAID/SCSI. This information is used to
 * differentiate the virtual channels and physical channels and to support
 * ROMB feature and non-disk devices.
 */
static void
mega_enum_raid_scsi(adapter_t *adapter)
{
        unsigned char raw_mbox[sizeof(struct mbox_out)];
        mbox_t *mbox;
        int i;

        mbox = (mbox_t *)raw_mbox;

        memset(&mbox->m_out, 0, sizeof(raw_mbox));

        /*
         * issue command to find out what channels are raid/scsi
         */
        raw_mbox[0] = CHNL_CLASS;
        raw_mbox[2] = GET_CHNL_CLASS;

        memset((void *)adapter->mega_buffer, 0, MEGA_BUFFER_SIZE);

        mbox->m_out.xferaddr = (u32)adapter->buf_dma_handle;

        /*
         * Non-ROMB firmware fail this command, so all channels
         * must be shown RAID
         */
        adapter->mega_ch_class = 0xFF;

        if(!issue_scb_block(adapter, raw_mbox)) {
                adapter->mega_ch_class = *((char *)adapter->mega_buffer);

        }

        for( i = 0; i < adapter->product_info.nchannels; i++ ) { 
                if( (adapter->mega_ch_class >> i) & 0x01 ) {
                        dev_info(&adapter->dev->dev, "channel[%d] is raid\n",
                                        i);
                }
                else {
                        dev_info(&adapter->dev->dev, "channel[%d] is scsi\n",
                                        i);
                }
        }

        return;
}


/**
 * mega_get_boot_drv()
 * @adapter - pointer to our soft state
 *
 * Find out which device is the boot device. Note, any logical drive or any
 * phyical device (e.g., a CDROM) can be designated as a boot device.
 */
static void
mega_get_boot_drv(adapter_t *adapter)
{
        struct private_bios_data        *prv_bios_data;
        unsigned char   raw_mbox[sizeof(struct mbox_out)];
        mbox_t  *mbox;
        u16     cksum = 0;
        u8      *cksum_p;
        u8      boot_pdrv;
        int     i;

        mbox = (mbox_t *)raw_mbox;

        memset(&mbox->m_out, 0, sizeof(raw_mbox));

        raw_mbox[0] = BIOS_PVT_DATA;
        raw_mbox[2] = GET_BIOS_PVT_DATA;

        memset((void *)adapter->mega_buffer, 0, MEGA_BUFFER_SIZE);

        mbox->m_out.xferaddr = (u32)adapter->buf_dma_handle;

        adapter->boot_ldrv_enabled = 0;
        adapter->boot_ldrv = 0;

        adapter->boot_pdrv_enabled = 0;
        adapter->boot_pdrv_ch = 0;
        adapter->boot_pdrv_tgt = 0;

        if(issue_scb_block(adapter, raw_mbox) == 0) {
                prv_bios_data =
                        (struct private_bios_data *)adapter->mega_buffer;

                cksum = 0;
                cksum_p = (char *)prv_bios_data;
                for (i = 0; i < 14; i++ ) {
                        cksum += (u16)(*cksum_p++);
                }

                if (prv_bios_data->cksum == (u16)(0-cksum) ) {

                        /*
                         * If MSB is set, a physical drive is set as boot
                         * device
                         */
                        if( prv_bios_data->boot_drv & 0x80 ) {
                                adapter->boot_pdrv_enabled = 1;
                                boot_pdrv = prv_bios_data->boot_drv & 0x7F;
                                adapter->boot_pdrv_ch = boot_pdrv / 16;
                                adapter->boot_pdrv_tgt = boot_pdrv % 16;
                        }
                        else {
                                adapter->boot_ldrv_enabled = 1;
                                adapter->boot_ldrv = prv_bios_data->boot_drv;
                        }
                }
        }

}

/**
 * mega_support_random_del()
 * @adapter - pointer to our soft state
 *
 * Find out if this controller supports random deletion and addition of
 * logical drives
 */
static int
mega_support_random_del(adapter_t *adapter)
{
        unsigned char raw_mbox[sizeof(struct mbox_out)];
        mbox_t *mbox;
        int rval;

        mbox = (mbox_t *)raw_mbox;

        memset(&mbox->m_out, 0, sizeof(raw_mbox));

        /*
         * issue command
         */
        raw_mbox[0] = FC_DEL_LOGDRV;
        raw_mbox[2] = OP_SUP_DEL_LOGDRV;

        rval = issue_scb_block(adapter, raw_mbox);

        return !rval;
}


/**
 * mega_support_ext_cdb()
 * @adapter - pointer to our soft state
 *
 * Find out if this firmware support cdblen > 10
 */
static int
mega_support_ext_cdb(adapter_t *adapter)
{
        unsigned char raw_mbox[sizeof(struct mbox_out)];
        mbox_t *mbox;
        int rval;

        mbox = (mbox_t *)raw_mbox;

        memset(&mbox->m_out, 0, sizeof(raw_mbox));
        /*
         * issue command to find out if controller supports extended CDBs.
         */
        raw_mbox[0] = 0xA4;
        raw_mbox[2] = 0x16;

        rval = issue_scb_block(adapter, raw_mbox);

        return !rval;
}


/**
 * mega_del_logdrv()
 * @adapter - pointer to our soft state
 * @logdrv - logical drive to be deleted
 *
 * Delete the specified logical drive. It is the responsibility of the user
 * app to let the OS know about this operation.
 */
static int
mega_del_logdrv(adapter_t *adapter, int logdrv)
{
        unsigned long flags;
        scb_t *scb;
        int rval;

        /*
         * Stop sending commands to the controller, queue them internally.
         * When deletion is complete, ISR will flush the queue.
         */
        atomic_set(&adapter->quiescent, 1);

        /*
         * Wait till all the issued commands are complete and there are no
         * commands in the pending queue
         */
        while (atomic_read(&adapter->pend_cmds) > 0 ||
               !list_empty(&adapter->pending_list))
                msleep(1000);   /* sleep for 1s */

        rval = mega_do_del_logdrv(adapter, logdrv);

        spin_lock_irqsave(&adapter->lock, flags);

        /*
         * If delete operation was successful, add 0x80 to the logical drive
         * ids for commands in the pending queue.
         */
        if (adapter->read_ldidmap) {
                struct list_head *pos;
                list_for_each(pos, &adapter->pending_list) {
                        scb = list_entry(pos, scb_t, list);
                        if (scb->pthru->logdrv < 0x80 )
                                scb->pthru->logdrv += 0x80;
                }
        }

        atomic_set(&adapter->quiescent, 0);

        mega_runpendq(adapter);

        spin_unlock_irqrestore(&adapter->lock, flags);

        return rval;
}


static int
mega_do_del_logdrv(adapter_t *adapter, int logdrv)
{
        megacmd_t       mc;
        int     rval;

        memset( &mc, 0, sizeof(megacmd_t));

        mc.cmd = FC_DEL_LOGDRV;
        mc.opcode = OP_DEL_LOGDRV;
        mc.subopcode = logdrv;

        rval = mega_internal_command(adapter, &mc, NULL);

        /* log this event */
        if(rval) {
                dev_warn(&adapter->dev->dev, "Delete LD-%d failed", logdrv);
                return rval;
        }

        /*
         * After deleting first logical drive, the logical drives must be
         * addressed by adding 0x80 to the logical drive id.
         */
        adapter->read_ldidmap = 1;

        return rval;
}


/**
 * mega_get_max_sgl()
 * @adapter - pointer to our soft state
 *
 * Find out the maximum number of scatter-gather elements supported by this
 * version of the firmware
 */
static void
mega_get_max_sgl(adapter_t *adapter)
{
        unsigned char   raw_mbox[sizeof(struct mbox_out)];
        mbox_t  *mbox;

        mbox = (mbox_t *)raw_mbox;

        memset(mbox, 0, sizeof(raw_mbox));

        memset((void *)adapter->mega_buffer, 0, MEGA_BUFFER_SIZE);

        mbox->m_out.xferaddr = (u32)adapter->buf_dma_handle;

        raw_mbox[0] = MAIN_MISC_OPCODE;
        raw_mbox[2] = GET_MAX_SG_SUPPORT;


        if( issue_scb_block(adapter, raw_mbox) ) {
                /*
                 * f/w does not support this command. Choose the default value
                 */
                adapter->sglen = MIN_SGLIST;
        }
        else {
                adapter->sglen = *((char *)adapter->mega_buffer);
                
                /*
                 * Make sure this is not more than the resources we are
                 * planning to allocate
                 */
                if ( adapter->sglen > MAX_SGLIST )
                        adapter->sglen = MAX_SGLIST;
        }

        return;
}


/**
 * mega_support_cluster()
 * @adapter - pointer to our soft state
 *
 * Find out if this firmware support cluster calls.
 */
static int
mega_support_cluster(adapter_t *adapter)
{
        unsigned char   raw_mbox[sizeof(struct mbox_out)];
        mbox_t  *mbox;

        mbox = (mbox_t *)raw_mbox;

        memset(mbox, 0, sizeof(raw_mbox));

        memset((void *)adapter->mega_buffer, 0, MEGA_BUFFER_SIZE);

        mbox->m_out.xferaddr = (u32)adapter->buf_dma_handle;

        /*
         * Try to get the initiator id. This command will succeed iff the
         * clustering is available on this HBA.
         */
        raw_mbox[0] = MEGA_GET_TARGET_ID;

        if( issue_scb_block(adapter, raw_mbox) == 0 ) {

                /*
                 * Cluster support available. Get the initiator target id.
                 * Tell our id to mid-layer too.
                 */
                adapter->this_id = *(u32 *)adapter->mega_buffer;
                adapter->host->this_id = adapter->this_id;

                return 1;
        }

        return 0;
}

#ifdef CONFIG_PROC_FS
/**
 * mega_adapinq()
 * @adapter - pointer to our soft state
 * @dma_handle - DMA address of the buffer
 *
 * Issue internal commands while interrupts are available.
 * We only issue direct mailbox commands from within the driver. ioctl()
 * interface using these routines can issue passthru commands.
 */
static int
mega_adapinq(adapter_t *adapter, dma_addr_t dma_handle)
{
        megacmd_t       mc;

        memset(&mc, 0, sizeof(megacmd_t));

        if( adapter->flag & BOARD_40LD ) {
                mc.cmd = FC_NEW_CONFIG;
                mc.opcode = NC_SUBOP_ENQUIRY3;
                mc.subopcode = ENQ3_GET_SOLICITED_FULL;
        }
        else {
                mc.cmd = MEGA_MBOXCMD_ADPEXTINQ;
        }

        mc.xferaddr = (u32)dma_handle;

        if ( mega_internal_command(adapter, &mc, NULL) != 0 ) {
                return -1;
        }

        return 0;
}


/** mega_internal_dev_inquiry()
 * @adapter - pointer to our soft state
 * @ch - channel for this device
 * @tgt - ID of this device
 * @buf_dma_handle - DMA address of the buffer
 *