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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [scsi/] [megaraid2.c] - Blame information for rev 1774

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/*
 *
 *                      Linux MegaRAID device driver
 *
 * Copyright (c) 2002  LSI Logic Corporation.
 *
 *         This program is free software; you can redistribute it and/or
 *         modify it under the terms of the GNU General Public License
 *         as published by the Free Software Foundation; either version
 *         2 of the License, or (at your option) any later version.
 *
 * Copyright (c) 2002  Red Hat, Inc. All rights reserved.
 *        - fixes
 *        - speed-ups (list handling fixes, issued_list, optimizations.)
 *        - lots of cleanups.
 *
 * Version : v2.10.1 (Dec 03, 2003) - Atul Mukker <Atul.Mukker@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 public mailing list
 * linux-megaraid-devel@dell.com, and subscribe to and read archives of this
 * list at http://lists.us.dell.com/.
 *
 * For history of changes, see ChangeLog.megaraid.
 *
 */
 
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/blk.h>
#include <asm/uaccess.h>
#include <linux/delay.h>
#include <linux/reboot.h>
#include <linux/module.h>
#include <linux/list.h>
 
#include "sd.h"
#include "scsi.h"
#include "hosts.h"
 
#include "megaraid2.h"
 
MODULE_AUTHOR ("LSI Logic Corporation");
MODULE_DESCRIPTION ("LSI Logic MegaRAID driver");
MODULE_LICENSE ("GPL");
 
static unsigned int max_cmd_per_lun = DEF_CMD_PER_LUN;
MODULE_PARM(max_cmd_per_lun, "i");
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_PARM(max_sectors_per_io, "h");
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_PARM(max_mbox_busy_wait, "h");
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)->base + 0x20)
#define RDOUTDOOR(adapter)              readl((adapter)->base + 0x2C)
#define WRINDOOR(adapter,value)         writel(value, (adapter)->base + 0x20)
#define WROUTDOOR(adapter,value)        writel(value, (adapter)->base + 0x2C)
 
/*
 * Global variables
 */
 
static int hba_count;
static adapter_t *hba_soft_state[MAX_CONTROLLERS];
#ifdef CONFIG_PROC_FS
static struct proc_dir_entry *mega_proc_dir_entry;
#endif
 
static struct notifier_block mega_notifier = {
        .notifier_call = megaraid_reboot_notify
};
 
/* For controller re-ordering */
static struct mega_hbas mega_hbas[MAX_CONTROLLERS];
 
/*
 * The File Operations structure for the serial/ioctl interface of the driver
 */
static struct file_operations megadev_fops = {
        .ioctl          = megadev_ioctl,
        .open           = megadev_open,
        .release        = megadev_close,
        .owner          = THIS_MODULE,
};
 
/*
 * 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 = 0x02100000;
 
/* 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;
 
/*
 * megaraid_validate_parms()
 *
 * Validate that any module parms passed in
 * have proper values.
 */
static void
megaraid_validate_parms(void)
{
        if( (max_cmd_per_lun <= 0) || (max_cmd_per_lun > MAX_CMD_PER_LUN) )
                max_cmd_per_lun = MAX_CMD_PER_LUN;
        if( max_mbox_busy_wait > MBOX_BUSY_WAIT )
                max_mbox_busy_wait = MBOX_BUSY_WAIT;
}
 
 
/**
 * megaraid_detect()
 * @host_template - Our soft state maintained by mid-layer
 *
 * the detect entry point for the mid-layer.
 * We scan the PCI bus for our controllers and start them.
 *
 * Note: PCI_DEVICE_ID_PERC4_DI below represents the PERC4/Di class of
 * products. All of them share the same vendor id, device id, and subsystem
 * vendor id but different subsystem ids. As of now, driver does not use the
 * subsystem id.
 * PERC4E device ids are for the PCI-Express controllers
 */
static int
megaraid_detect(Scsi_Host_Template *host_template)
{
        int     i;
        u16     dev_sw_table[] = {      /* Table of all supported
                                           vendor/device ids */
 
                PCI_VENDOR_ID_LSI_LOGIC,        PCI_DEVICE_ID_LSI_SATA_PCIX,
                PCI_VENDOR_ID_LSI_LOGIC,        PCI_DEVICE_ID_PERC4E_DC_SC,
                PCI_VENDOR_ID_DELL,             PCI_DEVICE_ID_PERC4E_SI_DI,
                PCI_VENDOR_ID_DELL,             PCI_DEVICE_ID_DISCOVERY,
                PCI_VENDOR_ID_DELL,             PCI_DEVICE_ID_PERC4_DI,
                PCI_VENDOR_ID_LSI_LOGIC,        PCI_DEVICE_ID_PERC4_QC_VERDE,
                PCI_VENDOR_ID_AMI,              PCI_DEVICE_ID_AMI_MEGARAID,
                PCI_VENDOR_ID_AMI,              PCI_DEVICE_ID_AMI_MEGARAID2,
                PCI_VENDOR_ID_AMI,              PCI_DEVICE_ID_AMI_MEGARAID3,
                PCI_VENDOR_ID_INTEL,            PCI_DEVICE_ID_AMI_MEGARAID3,
                PCI_VENDOR_ID_LSI_LOGIC,        PCI_DEVICE_ID_AMI_MEGARAID3 };
 
 
        printk(KERN_NOTICE "megaraid: " MEGARAID_VERSION);
 
        megaraid_validate_parms();
 
        /*
         * Scan PCI bus for our all devices.
         */
        for( i = 0; i < sizeof(dev_sw_table)/sizeof(u16); i += 2 ) {
 
                mega_find_card(host_template, dev_sw_table[i],
                                dev_sw_table[i+1]);
        }
 
        if(hba_count) {
                /*
                 * re-order hosts so that one with bootable logical drive
                 * comes first
                 */
                mega_reorder_hosts();
 
#ifdef CONFIG_PROC_FS
                mega_proc_dir_entry = proc_mkdir("megaraid", &proc_root);
 
                if(!mega_proc_dir_entry) {
                        printk(KERN_WARNING
                                "megaraid: failed to create megaraid root\n");
                }
                else {
                        for(i = 0; i < hba_count; i++) {
                                mega_create_proc_entry(i, mega_proc_dir_entry);
                        }
                }
#endif
 
                /*
                 * Register the driver as a character device, for applications
                 * to access it for ioctls.
                 * First argument (major) to register_chrdev implies a dynamic
                 * major number allocation.
                 */
                major = register_chrdev(0, "megadev", &megadev_fops);
 
                /*
                 * Register the Shutdown Notification hook in kernel
                 */
                if(register_reboot_notifier(&mega_notifier)) {
                        printk(KERN_WARNING
                                "MegaRAID Shutdown routine not registered!!\n");
                }
 
        }
 
        return hba_count;
}
 
 
 
/**
 * mega_find_card() - find and start this controller
 * @host_template - Our soft state maintained by mid-layer
 * @pci_vendor - pci vendor id for this controller
 * @pci_device - pci device id for this controller
 *
 * Scans the PCI bus for this vendor and device id combination, setup the
 * resources, and register ourselves as a SCSI HBA driver, and setup all
 * parameters for our soft state.
 *
 * This routine also checks for some buggy firmware and ajust the flags
 * accordingly.
 */
static void
mega_find_card(Scsi_Host_Template *host_template, u16 pci_vendor,
        u16 pci_device)
{
        struct Scsi_Host        *host = NULL;
        adapter_t       *adapter = NULL;
        u32     magic64;
        unsigned long   mega_baseport;
        u16     subsysid, subsysvid;
        u8      pci_bus;
        u8      pci_dev_func;
        u8      irq;
        struct pci_dev  *pdev = NULL;
        u8      did_ioremap_f = 0;
        u8      did_req_region_f = 0;
        u8      did_scsi_reg_f = 0;
        u8      alloc_int_buf_f = 0;
        u8      alloc_scb_f = 0;
        u8      got_irq_f = 0;
        u8      did_setup_mbox_f = 0;
        unsigned long   tbase;
        unsigned long   flag = 0;
        int     i, j;
 
        while((pdev = pci_find_device(pci_vendor, pci_device, pdev))) {
 
                // reset flags for all controllers in this class
                did_ioremap_f = 0;
                did_req_region_f = 0;
                did_scsi_reg_f = 0;
                alloc_int_buf_f = 0;
                alloc_scb_f = 0;
                got_irq_f = 0;
                did_setup_mbox_f = 0;
 
                if(pci_enable_device (pdev)) continue;
 
                pci_bus = pdev->bus->number;
                pci_dev_func = pdev->devfn;
 
                /*
                 * For these vendor and device ids, signature offsets are not
                 * valid and 64 bit is implicit
                 */
                if( (pci_vendor == PCI_VENDOR_ID_DELL &&
                                pci_device == PCI_DEVICE_ID_PERC4_DI) ||
                        (pci_vendor == PCI_VENDOR_ID_LSI_LOGIC &&
                                pci_device == PCI_DEVICE_ID_PERC4_QC_VERDE) ||
                        (pci_vendor == PCI_VENDOR_ID_LSI_LOGIC &&
                                pci_device == PCI_DEVICE_ID_PERC4E_DC_SC) ||
                        (pci_vendor == PCI_VENDOR_ID_DELL &&
                                pci_device == PCI_DEVICE_ID_PERC4E_SI_DI) ||
                        (pci_vendor == PCI_VENDOR_ID_LSI_LOGIC &&
                                pci_device == PCI_DEVICE_ID_LSI_SATA_PCIX)) {
 
                        flag |= BOARD_64BIT;
                }
                else {
                        pci_read_config_dword(pdev, PCI_CONF_AMISIG64,
                                        &magic64);
 
                        if (magic64 == HBA_SIGNATURE_64BIT)
                                flag |= BOARD_64BIT;
                }
 
                subsysvid = pdev->subsystem_vendor;
                subsysid = pdev->subsystem_device;
 
                /*
                 * If we do not find the valid subsys vendor id, refuse to
                 * load the driver. This is part of PCI200X compliance
                 * We load the driver if subsysvid is 0.
                 */
                if( subsysvid && (subsysvid != AMI_SUBSYS_VID) &&
                                (subsysvid != DELL_SUBSYS_VID) &&
                                (subsysvid != HP_SUBSYS_VID) &&
                                (subsysvid != INTEL_SUBSYS_VID) &&
                                (subsysvid != LSI_SUBSYS_VID) ) continue;
 
 
                printk(KERN_NOTICE "megaraid: found 0x%4.04x:0x%4.04x:bus %d:",
                        pci_vendor, pci_device, pci_bus);
 
                printk("slot %d:func %d\n",
                        PCI_SLOT(pci_dev_func), PCI_FUNC(pci_dev_func));
 
                /* Read the base port and IRQ from PCI */
                mega_baseport = pci_resource_start(pdev, 0);
                irq = pdev->irq;
 
                tbase = mega_baseport;
 
                if( pci_resource_flags(pdev, 0) & IORESOURCE_MEM ) {
 
                        if( check_mem_region(mega_baseport, 128) ) {
                                printk(KERN_WARNING
                                        "megaraid: mem region busy!\n");
                                continue;
                        }
                        request_mem_region(mega_baseport, 128,
                                        "MegaRAID: LSI Logic Corporation.");
 
                        mega_baseport =
                                (unsigned long)ioremap(mega_baseport, 128);
 
                        if( !mega_baseport ) {
                                printk(KERN_WARNING
                                        "megaraid: could not map hba memory\n");
 
                                release_mem_region(tbase, 128);
 
                                continue;
                        }
 
                        flag |= BOARD_MEMMAP;
 
                        did_ioremap_f = 1;
                }
                else {
                        mega_baseport += 0x10;
 
                        if( !request_region(mega_baseport, 16, "megaraid") )
                                goto fail_attach;
 
                        flag |= BOARD_IOMAP;
 
                        did_req_region_f = 1;
                }
 
                /* Initialize SCSI Host structure */
                host = scsi_register(host_template, sizeof(adapter_t));
 
                if(!host) goto fail_attach;
 
                did_scsi_reg_f = 1;
 
                scsi_set_pci_device(host, pdev);
 
                adapter = (adapter_t *)host->hostdata;
                memset(adapter, 0, sizeof(adapter_t));
 
                printk(KERN_NOTICE
                        "scsi%d:Found MegaRAID controller at 0x%lx, IRQ:%d\n",
                        host->host_no, mega_baseport, irq);
 
                adapter->base = mega_baseport;
 
                /* Copy resource info into structure */
                INIT_LIST_HEAD(&adapter->free_list);
                INIT_LIST_HEAD(&adapter->pending_list);
 
                adapter->flag = flag;
                spin_lock_init(&adapter->lock);
 
#ifdef SCSI_HAS_HOST_LOCK
#  if LINUX_VERSION_CODE <= KERNEL_VERSION(2,4,9)
                /* This is the Red Hat AS2.1 kernel */
                adapter->host_lock = &adapter->lock;
                host->lock = adapter->host_lock;
#  elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
                /* This is the later Red Hat 2.4 kernels */
                adapter->host_lock = &adapter->lock;
                host->host_lock = adapter->host_lock;
#  else
                /* This is the 2.6 and later kernel series */
                adapter->host_lock = &adapter->lock;
                scsi_set_host_lock(&adapter->lock);
#  endif
#else
                /* And this is the remainder of the 2.4 kernel series */
                adapter->host_lock = &io_request_lock;
#endif
 
                host->cmd_per_lun = max_cmd_per_lun;
                host->max_sectors = max_sectors_per_io;
 
                adapter->dev = pdev;
                adapter->host = host;
 
                adapter->host->irq = irq;
 
                if( flag & BOARD_MEMMAP ) {
                        adapter->host->base = tbase;
                }
                else {
                        adapter->host->io_port = tbase;
                        adapter->host->n_io_port = 16;
                }
 
                adapter->host->unique_id = (pci_bus << 8) | pci_dev_func;
 
                /*
                 * Allocate buffer to issue internal commands.
                 */
                adapter->mega_buffer = pci_alloc_consistent(adapter->dev,
                        MEGA_BUFFER_SIZE, &adapter->buf_dma_handle);
 
                if( !adapter->mega_buffer ) {
                        printk(KERN_WARNING "megaraid: out of RAM.\n");
                        goto fail_attach;
                }
                alloc_int_buf_f = 1;
 
                adapter->scb_list = kmalloc(sizeof(scb_t)*MAX_COMMANDS,
                                GFP_KERNEL);
 
                if(!adapter->scb_list) {
                        printk(KERN_WARNING "megaraid: out of RAM.\n");
                        goto fail_attach;
                }
 
                alloc_scb_f = 1;
 
                /* Request our IRQ */
                if( adapter->flag & BOARD_MEMMAP ) {
                        if(request_irq(irq, megaraid_isr_memmapped, SA_SHIRQ,
                                                "megaraid", adapter)) {
                                printk(KERN_WARNING
                                        "megaraid: Couldn't register IRQ %d!\n",
                                        irq);
                                goto fail_attach;
                        }
                }
                else {
                        if(request_irq(irq, megaraid_isr_iomapped, SA_SHIRQ,
                                                "megaraid", adapter)) {
                                printk(KERN_WARNING
                                        "megaraid: Couldn't register IRQ %d!\n",
                                        irq);
                                goto fail_attach;
                        }
                }
                got_irq_f = 1;
 
                if( mega_setup_mailbox(adapter) != 0 )
                        goto fail_attach;
 
                did_setup_mbox_f = 1;
 
                if( mega_query_adapter(adapter) != 0 )
                        goto fail_attach;
 
                /*
                 * Have checks for some buggy f/w
                 */
                if((subsysid == 0x1111) && (subsysvid == 0x1111)) {
                        /*
                         * Which firmware
                         */
                        if (!strcmp(adapter->fw_version, "3.00") ||
                                        !strcmp(adapter->fw_version, "3.01")) {
 
                                printk( KERN_WARNING
                                        "megaraid: Your  card is a Dell PERC "
                                        "2/SC RAID controller with  "
                                        "firmware\nmegaraid: 3.00 or 3.01.  "
                                        "This driver is known to have "
                                        "corruption issues\nmegaraid: with "
                                        "those firmware versions on this "
                                        "specific card.  In order\nmegaraid: "
                                        "to protect your data, please upgrade "
                                        "your firmware to version\nmegaraid: "
                                        "3.10 or later, available from the "
                                        "Dell Technical Support web\n"
                                        "megaraid: site at\nhttp://support."
                                        "dell.com/us/en/filelib/download/"
                                        "index.asp?fileid=2940\n"
                                );
                        }
                }
 
                /*
                 * If we have a HP 1M(0x60E7)/2M(0x60E8) controller with
                 * firmware H.01.07, H.01.08, and H.01.09 disable 64 bit
                 * support, since this firmware cannot handle 64 bit
                 * addressing
                 */
 
                if((subsysvid == HP_SUBSYS_VID) &&
                                ((subsysid == 0x60E7)||(subsysid == 0x60E8))) {
 
                        /*
                         * which firmware
                         */
                        if( !strcmp(adapter->fw_version, "H01.07") ||
                                !strcmp(adapter->fw_version, "H01.08") ||
                                !strcmp(adapter->fw_version, "H01.09") ) {
 
                                printk(KERN_WARNING
                                        "megaraid: Firmware H.01.07, "
                                        "H.01.08, and H.01.09 on 1M/2M "
                                        "controllers\n"
                                        "megaraid: do not support 64 bit "
                                        "addressing.\nmegaraid: DISABLING "
                                        "64 bit support.\n");
                                adapter->flag &= ~BOARD_64BIT;
                        }
                }
 
 
                if(mega_is_bios_enabled(adapter)) {
                        mega_hbas[hba_count].is_bios_enabled = 1;
                }
                mega_hbas[hba_count].hostdata_addr = adapter;
 
                /*
                 * Find out which channel is raid and which is scsi. This is
                 * for ROMB support.
                 */
                mega_enum_raid_scsi(adapter);
 
                /*
                 * Find out if a logical drive is set as the boot drive. If
                 * there is one, will make that as the first logical drive.
                 * ROMB: Do we have to boot from a physical drive. Then all
                 * the physical drives would appear before the logical disks.
                 * Else, all the physical drives would be exported to the mid
                 * layer after logical drives.
                 */
                mega_get_boot_drv(adapter);
 
                if( ! adapter->boot_pdrv_enabled ) {
                        for( i = 0; i < NVIRT_CHAN; i++ )
                                adapter->logdrv_chan[i] = 1;
 
                        for( i = NVIRT_CHAN; i<MAX_CHANNELS+NVIRT_CHAN; i++ )
                                adapter->logdrv_chan[i] = 0;
 
                        adapter->mega_ch_class <<= NVIRT_CHAN;
                }
                else {
                        j = adapter->product_info.nchannels;
                        for( i = 0; i < j; i++ )
                                adapter->logdrv_chan[i] = 0;
 
                        for( i = j; i < NVIRT_CHAN + j; i++ )
                                adapter->logdrv_chan[i] = 1;
                }
 
 
                /*
                 * Do we support random deletion and addition of logical
                 * drives
                 */
                adapter->read_ldidmap = 0;       /* set it after first logdrv
                                                   delete cmd */
                adapter->support_random_del = mega_support_random_del(adapter);
 
                /* Initialize SCBs */
                if(mega_init_scb(adapter)) {
                        goto fail_attach;
                }
 
                /*
                 * Reset the pending commands counter
                 */
                atomic_set(&adapter->pend_cmds, 0);
 
                /*
                 * Reset the adapter quiescent flag
                 */
                atomic_set(&adapter->quiescent, 0);
 
                hba_soft_state[hba_count] = adapter;
 
                /*
                 * Fill in the structure which needs to be passed back to the
                 * application when it does an ioctl() for controller related
                 * information.
                 */
                i = hba_count;
 
                mcontroller[i].base = mega_baseport;
                mcontroller[i].irq = irq;
                mcontroller[i].numldrv = adapter->numldrv;
                mcontroller[i].pcibus = pci_bus;
                mcontroller[i].pcidev = pci_device;
                mcontroller[i].pcifun = PCI_FUNC (pci_dev_func);
                mcontroller[i].pciid = -1;
                mcontroller[i].pcivendor = pci_vendor;
                mcontroller[i].pcislot = PCI_SLOT (pci_dev_func);
                mcontroller[i].uid = (pci_bus << 8) | pci_dev_func;
 
 
                /* Set the Mode of addressing to 64 bit if we can */
                if((adapter->flag & BOARD_64BIT)&&(sizeof(dma_addr_t) == 8)) {
                        pci_set_dma_mask(pdev, 0xffffffffffffffffULL);
                        adapter->has_64bit_addr = 1;
                }
                else  {
                        pci_set_dma_mask(pdev, 0xffffffff);
                        adapter->has_64bit_addr = 0;
                }
 
                init_MUTEX(&adapter->int_mtx);
                init_waitqueue_head(&adapter->int_waitq);
 
                adapter->this_id = DEFAULT_INITIATOR_ID;
                adapter->host->this_id = DEFAULT_INITIATOR_ID;
 
#if MEGA_HAVE_CLUSTERING
                /*
                 * Is cluster support enabled on this controller
                 * Note: In a cluster the HBAs ( the initiators ) will have
                 * different target IDs and we cannot assume it to be 7. Call
                 * to mega_support_cluster() will get the target ids also if
                 * the cluster support is available
                 */
                adapter->has_cluster = mega_support_cluster(adapter);
 
                if( adapter->has_cluster ) {
                        printk(KERN_NOTICE
                                "megaraid: Cluster driver, initiator id:%d\n",
                                adapter->this_id);
                }
#endif
 
                hba_count++;
                continue;
 
fail_attach:
                if( did_setup_mbox_f ) {
                        pci_free_consistent(adapter->dev, sizeof(mbox64_t),
                                        (void *)adapter->una_mbox64,
                                        adapter->una_mbox64_dma);
                }
 
                if( got_irq_f ) {
                        irq_disable(adapter);
                        free_irq(adapter->host->irq, adapter);
                }
 
                if( alloc_scb_f ) {
                        kfree(adapter->scb_list);
                }
 
                if( alloc_int_buf_f ) {
                        pci_free_consistent(adapter->dev, MEGA_BUFFER_SIZE,
                                        (void *)adapter->mega_buffer,
                                        adapter->buf_dma_handle);
                }
 
                if( did_scsi_reg_f ) scsi_unregister(host);
 
                if( did_ioremap_f ) {
                        iounmap((void *)mega_baseport);
                        release_mem_region(tbase, 128);
                }
 
                if( did_req_region_f )
                        release_region(mega_baseport, 16);
        }
 
        return;
}
 
 
/**
 * 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_p(adapter->mbox_dma & 0xFF,
                                adapter->host->io_port + MBOX_PORT0);
 
                outb_p((adapter->mbox_dma >> 8) & 0xFF,
                                adapter->host->io_port + MBOX_PORT1);
 
                outb_p((adapter->mbox_dma >> 16) & 0xFF,
                                adapter->host->io_port + MBOX_PORT2);
 
                outb_p((adapter->mbox_dma >> 24) & 0xFF,
                                adapter->host->io_port + MBOX_PORT3);
 
                outb_p(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(mbox_t)];
        mbox_t  *mbox;
        int     retval;
 
        /* Initialize adapter inquiry mailbox */
 
        mbox = (mbox_t *)raw_mbox;
 
        memset((void *)adapter->mega_buffer, 0, MEGA_BUFFER_SIZE);
        memset(raw_mbox, 0, sizeof(raw_mbox));
 
        /*
         * Try to issue Inquiry3 command
         * if not succeeded, then issue MEGA_MBOXCMD_ADAPTERINQ command and
         * update enquiry3 structure
         */
        mbox->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->xferaddr = (u32)dma_handle;
 
                /*issue old 0x04 command to adapter */
                mbox->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->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)))
                        printk(KERN_WARNING
                        "megaraid: Product_info cmd failed with error: %d\n",
                                retval);
 
                pci_dma_sync_single(adapter->dev, prod_info_dma_handle,
                                sizeof(mega_product_info),
                                PCI_DMA_FROMDEVICE);
 
                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;     /* Upto 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 */
        if (adapter->product_info.subsysvid == HP_SUBSYS_VID) {
                sprintf (adapter->fw_version, "%c%d%d.%d%d",
                         adapter->product_info.fw_version[2],
                         adapter->product_info.fw_version[1] >> 8,
                         adapter->product_info.fw_version[1] & 0x0f,
                         adapter->product_info.fw_version[0] >> 8,
                         adapter->product_info.fw_version[0] & 0x0f);
                sprintf (adapter->bios_version, "%c%d%d.%d%d",
                         adapter->product_info.bios_version[2],
                         adapter->product_info.bios_version[1] >> 8,
                         adapter->product_info.bios_version[1] & 0x0f,
                         adapter->product_info.bios_version[0] >> 8,
                         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;
        }
 
        printk(KERN_NOTICE "megaraid: [%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)
                printk(KERN_NOTICE "megaraid: supports extended CDBs.\n");
 
 
        return 0;
}
 
 
/*
 * 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(Scsi_Cmnd *scmd, void (*done)(Scsi_Cmnd *))
{
        adapter_t       *adapter;
        scb_t   *scb;
        int     busy=0;
 
        adapter = (adapter_t *)scmd->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.
         */
 
        scb = mega_build_cmd(adapter, scmd, &busy);
 
        if(scb) {
                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);
                }
                return 0;
        }
 
        return busy;
}
 
 
/**
 * 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, Scsi_Cmnd *cmd, int *busy)
{
        mega_ext_passthru       *epthru;
        mega_passthru   *pthru;
        scb_t   *scb;
        mbox_t  *mbox;
        long    seg;
        char    islogical;
        int     max_ldrv_num;
        int     channel = 0;
        int     target = 0;
        int     ldrv_num = 0;   /* logical drive number */
 
 
        /*
         * filter the internal and ioctl commands
         */
        if((cmd->cmnd[0] == MEGA_INTERNAL_CMD)) {
                return cmd->buffer;
        }
 
 
        /*
         * We know what channels our logical drives are on - mega_find_card()
         */
        islogical = adapter->logdrv_chan[cmd->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->channel -
                                adapter->product_info.nchannels;
                }
                else {
                        channel = cmd->channel; /* this is physical channel */
                        target = cmd->target;
 
                        /*
                         * 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 ) {
                        channel = cmd->channel; /* this is the logical channel
                                                 */
                }
                else {
                        channel = cmd->channel - NVIRT_CHAN;    /* physical
                                                                   channel */
                        target = cmd->target;
                }
        }
 
 
        if(islogical) {
 
                /* have just LUN 0 for each target on virtual channels */
                if (cmd->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->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:
                        memset(cmd->request_buffer, 0, cmd->request_bufflen);
 
#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))) {
 
                                cmd->result = (DID_ERROR << 16);
                                cmd->scsi_done(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:
                        memset(cmd->request_buffer, 0, cmd->cmnd[4]);
                        cmd->result = (DID_OK << 16);
                        cmd->scsi_done(cmd);
                        return NULL;
 
                case READ_CAPACITY:
                case INQUIRY:
 
                        if(!(adapter->flag & (1L << cmd->channel))) {
 
                                printk(KERN_NOTICE
                                        "scsi%d: scanning scsi channel %d ",
                                                adapter->host->host_no,
                                                cmd->channel);
                                printk("for logical drives.\n");
 
                                adapter->flag |= (1L << cmd->channel);
                        }
 
                        /* Allocate a SCB and initialize passthru */
                        if(!(scb = mega_allocate_scb(adapter, cmd))) {
 
                                cmd->result = (DID_ERROR << 16);
                                cmd->scsi_done(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->cmd = MEGA_MBOXCMD_PASSTHRU64;
                        }
                        else {
                                mbox->cmd = MEGA_MBOXCMD_PASSTHRU;
                        }
 
                        scb->dma_direction = PCI_DMA_FROMDEVICE;
 
                        pthru->numsgelements = mega_build_sglist(adapter, scb,
                                &pthru->dataxferaddr, &pthru->dataxferlen);
 
                        mbox->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))) {
 
                                cmd->result = (DID_ERROR << 16);
                                cmd->scsi_done(cmd);
                                *busy = 1;
 
                                return NULL;
                        }
                        mbox = (mbox_t *)scb->raw_mbox;
 
                        memset(mbox, 0, sizeof(scb->raw_mbox));
                        mbox->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->cmd = (*cmd->cmnd & 0x02) ?
                                        MEGA_MBOXCMD_LWRITE64:
                                        MEGA_MBOXCMD_LREAD64 ;
                        }
                        else {
                                mbox->cmd = (*cmd->cmnd & 0x02) ?
                                        MEGA_MBOXCMD_LWRITE:
                                        MEGA_MBOXCMD_LREAD ;
                        }
 
                        /*
                         * 6-byte READ(0x08) or WRITE(0x0A) cdb
                         */
                        if( cmd->cmd_len == 6 ) {
                                mbox->numsectors = (u32) cmd->cmnd[4];
                                mbox->lba =
                                        ((u32)cmd->cmnd[1] << 16) |
                                        ((u32)cmd->cmnd[2] << 8) |
                                        (u32)cmd->cmnd[3];
 
                                mbox->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->numsectors;
                                } else {
                                        adapter->nwrites[ldrv_num%0x80]++;
                                        adapter->nwriteblocks[ldrv_num%0x80] +=
                                                mbox->numsectors;
                                }
#endif
                        }
 
                        /*
                         * 10-byte READ(0x28) or WRITE(0x2A) cdb
                         */
                        if( cmd->cmd_len == 10 ) {
                                mbox->numsectors =
                                        (u32)cmd->cmnd[8] |
                                        ((u32)cmd->cmnd[7] << 8);
                                mbox->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->numsectors;
                                } else {
                                        adapter->nwrites[ldrv_num%0x80]++;
                                        adapter->nwriteblocks[ldrv_num%0x80] +=
                                                mbox->numsectors;
                                }
#endif
                        }
 
                        /*
                         * 12-byte READ(0xA8) or WRITE(0xAA) cdb
                         */
                        if( cmd->cmd_len == 12 ) {
                                mbox->lba =
                                        ((u32)cmd->cmnd[2] << 24) |
                                        ((u32)cmd->cmnd[3] << 16) |
                                        ((u32)cmd->cmnd[4] << 8) |
                                        (u32)cmd->cmnd[5];
 
                                mbox->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->numsectors;
                                } else {
                                        adapter->nwrites[ldrv_num%0x80]++;
                                        adapter->nwriteblocks[ldrv_num%0x80] +=
                                                mbox->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->numsgelements = mega_build_sglist(adapter, scb,
                                        (u32 *)&mbox->xferaddr, (u32 *)&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))) {
 
                                cmd->result = (DID_ERROR << 16);
                                cmd->scsi_done(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))) {
 
                        cmd->result = (DID_ERROR << 16);
                        cmd->scsi_done(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->cmd = MEGA_MBOXCMD_EXTPTHRU;
 
                        mbox->xferaddr = scb->epthru_dma_addr;
 
                }
                else {
 
                        pthru = mega_prepare_passthru(adapter, scb, cmd,
                                        channel, target);
 
                        /* Initialize mailbox */
                        if( adapter->has_64bit_addr ) {
                                mbox->cmd = MEGA_MBOXCMD_PASSTHRU64;
                        }
                        else {
                                mbox->cmd = MEGA_MBOXCMD_PASSTHRU;
                        }
 
                        mbox->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, 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->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->channel))) {
 
                        printk(KERN_NOTICE
                                "scsi%d: scanning scsi channel %d [P%d] ",
                                        adapter->host->host_no,
                                        cmd->channel, channel);
                        printk("for physical devices.\n");
 
                        adapter->flag |= (1L << cmd->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, 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->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->channel))) {
 
                        printk(KERN_NOTICE
                                "scsi%d: scanning scsi channel %d [P%d] ",
                                        adapter->host->host_no,
                                        cmd->channel, channel);
                        printk("for physical devices.\n");
 
                        adapter->flag |= (1L << cmd->channel);
                }
                /* Fall through */
        default:
                epthru->numsgelements = mega_build_sglist(adapter, scb,
                                &epthru->dataxferaddr, &epthru->dataxferlen);
                break;
        }
 
        return epthru;
}
 
 
/**
 * 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, 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_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);
}
 
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 inline 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->busy)) {
                do {
                        udelay(1);
                        i++;
                } while( mbox->busy && (i < max_mbox_busy_wait) );
 
                if(mbox->busy) return -1;
        }
 
        /* Copy mailbox data into host structure */
        memcpy((char *)mbox, (char *)scb->raw_mbox, 16);
 
        mbox->cmdid = scb->idx; /* Set cmdid */
        mbox->busy = 1;         /* Set busy */
 
 
        /*
         * Increment the pending queue counter
         */
        atomic_inc(&adapter->pend_cmds);
 
        switch (mbox->cmd) {
        case MEGA_MBOXCMD_EXTPTHRU:
                if( !adapter->has_64bit_addr ) break;
                // else fall through
        case MEGA_MBOXCMD_LREAD64:
        case MEGA_MBOXCMD_LWRITE64:
        case MEGA_MBOXCMD_PASSTHRU64:
                mbox64->xfer_segment_lo = mbox->xferaddr;
                mbox64->xfer_segment_hi = 0;
                mbox->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->poll = 0;
                mbox->ack = 0;
                WRINDOOR(adapter, adapter->mbox_dma | 0x1);
        }
        else {
                irq_enable(adapter);
                issue_command(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;
        u8      status;
        int     i;
 
        /* 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, 16);
        mbox->cmdid = 0xFE;
        mbox->busy = 1;
 
        switch (raw_mbox[0]) {
        case MEGA_MBOXCMD_EXTPTHRU:
                if( !adapter->has_64bit_addr ) break;
                // else fall through
        case MEGA_MBOXCMD_LREAD64:
        case MEGA_MBOXCMD_LWRITE64:
        case MEGA_MBOXCMD_PASSTHRU64:
                mbox64->xfer_segment_lo = mbox->xferaddr;
                mbox64->xfer_segment_hi = 0;
                mbox->xferaddr = 0xFFFFFFFF;
                break;
        default:
                mbox64->xfer_segment_lo = 0;
                mbox64->xfer_segment_hi = 0;
        }
 
        if( likely(adapter->flag & BOARD_MEMMAP) ) {
                mbox->poll = 0;
                mbox->ack = 0;
                mbox->numstatus = 0xFF;
                mbox->status = 0xFF;
                WRINDOOR(adapter, adapter->mbox_dma | 0x1);
 
                while((volatile u8)mbox->numstatus == 0xFF)
                        cpu_relax();
 
                mbox->numstatus = 0xFF;
 
                while((volatile u8)mbox->status == 0xFF)
                        cpu_relax();
 
                status = mbox->status;
                mbox->status = 0xFF;
 
                while( (volatile u8)mbox->poll != 0x77 )
                        cpu_relax();
 
                mbox->poll = 0;
                mbox->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();
 
                status = mbox->status;
                mbox->numstatus = 0xFF;
                mbox->status = 0xFF;
 
                set_irq_state(adapter, byte);
                irq_enable(adapter);
                irq_ack(adapter);
        }
 
        // invalidate the completed command id array. After command
        // completion, firmware would write the valid id.
        for (i = 0; i < MAX_FIRMWARE_STATUS; i++) {
                mbox->completed[i] = 0xFF;
        }
 
        return status;
 
bug_blocked_mailbox:
        printk(KERN_WARNING "megaraid: Blocked mailbox......!!\n");
        udelay (1000);
        return -1;
}
 
 
/**
 * megaraid_isr_iomapped()
 * @irq - irq
 * @devp - pointer to our soft state
 * @regs - unused
 *
 * 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 void
megaraid_isr_iomapped(int irq, void *devp, struct pt_regs *regs)
{
        adapter_t       *adapter = devp;
        unsigned long   flags;
 
 
        spin_lock_irqsave(adapter->host_lock, flags);
 
        megaraid_iombox_ack_sequence(adapter);
 
        /* Loop through any pending requests */
        if( atomic_read(&adapter->quiescent ) == 0) {
                mega_runpendq(adapter);
        }
 
        spin_unlock_irqrestore(adapter->host_lock, flags);
 
        return;
}
 
 
/**
 * megaraid_iombox_ack_sequence - interrupt ack sequence for IO mapped HBAs
 * @adapter     - controller's soft state
 *
 * Interrupt ackrowledgement sequence for IO mapped HBAs
 */
static inline void
megaraid_iombox_ack_sequence(adapter_t *adapter)
{
        u8      status;
        u8      nstatus;
        u8      completed[MAX_FIRMWARE_STATUS];
        u8      byte;
        int     i;
 
 
        /*
         * loop till F/W has more commands for us to complete.
         */
        do {
                /* Check if a valid interrupt is pending */
                byte = irq_state(adapter);
                if( (byte & VALID_INTR_BYTE) == 0 ) {
                        return;
                }
                set_irq_state(adapter, byte);
 
                while ((nstatus = adapter->mbox->numstatus) == 0xFF) {
                        cpu_relax();
                }
                adapter->mbox->numstatus = 0xFF;
 
                for (i = 0; i < nstatus; i++) {
                        while ((completed[i] = adapter->mbox->completed[i])
                                        == 0xFF) {
                                cpu_relax();
                        }
 
                        adapter->mbox->completed[i] = 0xFF;
                }
 
                // we must read the valid status now
                if ((status = adapter->mbox->status) == 0xFF) {
                        printk(KERN_WARNING
                        "megaraid critical: status 0xFF from firmware.\n");
                }
                adapter->mbox->status = 0xFF;
 
                /*
                 * decrement the pending queue counter
                 */
                atomic_sub(nstatus, &adapter->pend_cmds);
 
                /* Acknowledge interrupt */
                irq_ack(adapter);
 
                mega_cmd_done(adapter, completed, nstatus, status);
 
        } while(1);
}
 
 
/**
 * megaraid_isr_memmapped()
 * @irq - irq
 * @devp - pointer to our soft state
 * @regs - unused
 *
 * 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 void
megaraid_isr_memmapped(int irq, void *devp, struct pt_regs *regs)
{
        adapter_t       *adapter = devp;
        unsigned long   flags;
 
 
        spin_lock_irqsave(adapter->host_lock, flags);
 
        megaraid_memmbox_ack_sequence(adapter);
 
        /* Loop through any pending requests */
        if(atomic_read(&adapter->quiescent) == 0) {
                mega_runpendq(adapter);
        }
 
        spin_unlock_irqrestore(adapter->host_lock, flags);
 
        return;
}
 
 
/**
 * megaraid_memmbox_ack_sequence - interrupt ack sequence for memory mapped HBAs
 * @adapter     - controller's soft state
 *
 * Interrupt ackrowledgement sequence for memory mapped HBAs
 */
static inline void
megaraid_memmbox_ack_sequence(adapter_t *adapter)
{
        u8      status;
        u32     dword = 0;
        u8      nstatus;
        u8      completed[MAX_FIRMWARE_STATUS];
        int     i;
 
 
        /*
         * loop till F/W has more commands for us to complete.
         */
        do {
                /* Check if a valid interrupt is pending */
                dword = RDOUTDOOR(adapter);
                if( dword != 0x10001234 ) {
                        /*
                         * No more pending commands
                         */
                        return;
                }
                WROUTDOOR(adapter, 0x10001234);
 
                while ((nstatus = adapter->mbox->numstatus) == 0xFF) {
                        cpu_relax();
                }
                adapter->mbox->numstatus = 0xFF;
 
                for (i = 0; i < nstatus; i++ ) {
                        while ((completed[i] = adapter->mbox->completed[i])
                                        == 0xFF) {
                                cpu_relax();
                        }
 
                        adapter->mbox->completed[i] = 0xFF;
                }
 
                // we must read the valid status now
                if ((status = adapter->mbox->status) == 0xFF) {
                        printk(KERN_WARNING
                        "megaraid critical: status 0xFF from firmware.\n");
                }
                adapter->mbox->status = 0xFF;
 
                /*
                 * decrement the pending queue counter
                 */
                atomic_sub(nstatus, &adapter->pend_cmds);
 
                /* Acknowledge interrupt */
                WRINDOOR(adapter, 0x2);
 
                while( RDINDOOR(adapter) & 0x02 ) cpu_relax();
 
                mega_cmd_done(adapter, completed, nstatus, status);
 
        } while(1);
}
 
 
/**
 * 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 comamnds and call the scsi mid-layer callback hooks.
 */
static inline void
mega_cmd_done(adapter_t *adapter, u8 completed[], int nstatus, int status)
{
        mega_ext_passthru       *epthru = NULL;
        struct scatterlist      *sgl;
        Scsi_Cmnd       *cmd = NULL;
        mega_passthru   *pthru = NULL;
        mbox_t  *mbox = NULL;
        int     islogical;
        u8      c;
        scb_t   *scb;
        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];
 
                if( cmdid == CMDID_INT_CMDS ) { /* internal command */
                        scb = &adapter->int_scb;
                        cmd = scb->cmd;
                        mbox = (mbox_t *)scb->raw_mbox;
 
                        /*
                         * Internal command interface do not fire the extended
                         * passthru or 64-bit passthru
                         */
                        pthru = scb->pthru;
 
                }
                else {
                        scb = &adapter->scb_list[cmdid];
                        cmd = scb->cmd;
                        pthru = scb->pthru;
                        epthru = scb->epthru;
                        mbox = (mbox_t *)scb->raw_mbox;
 
                        /*
                         * Make sure f/w has completed a valid command
                         */
                        if( !(scb->state & SCB_ISSUED) || scb->cmd == NULL ) {
                                printk(KERN_CRIT
                                        "megaraid: invalid command ");
                                printk("Id %d, scb->state:%x, scsi cmd:%p\n",
                                        cmdid, scb->state, scb->cmd);
 
                                continue;
                        }
 
                        /*
                         * Was an abort issued for this command
                         */
                        if( scb->state & SCB_ABORT ) {
 
                                printk(KERN_NOTICE
                                "megaraid: aborted cmd %lx[%x] complete.\n",
                                        scb->cmd->serial_number, scb->idx);
 
                                cmd->result = (DID_ABORT << 16);
 
                                mega_free_scb(adapter, scb);
 
                                cmd->scsi_done(cmd);
 
                                continue;
                        }
 
                        /*
                         * Was a reset issued for this command
                         */
                        if( scb->state & SCB_RESET ) {
 
                                printk(KERN_WARNING
                                "megaraid: reset cmd %lx[%x] complete.\n",
                                        scb->cmd->serial_number, scb->idx);
 
                                scb->cmd->result = (DID_RESET << 16);
 
                                mega_free_scb (adapter, scb);
 
                                cmd->scsi_done(cmd);
 
                                continue;
                        }
 
#if MEGA_HAVE_STATS
                        {
 
                        int     logdrv = mbox->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->channel];
                if (cmd->cmnd[0] == INQUIRY && !islogical) {
 
                        if( cmd->use_sg ) {
                                sgl = (struct scatterlist *)
                                        cmd->request_buffer;
                                c = *(u8 *)sgl[0].address;
                        }
                        else {
                                c = *(u8 *)cmd->request_buffer;
                        }
 
                        if(IS_RAID_CH(adapter, cmd->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->cmd == MEGA_MBOXCMD_PASSTHRU ||
                                mbox->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->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;
                }
 
                /*
                 * 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 ) { /* internal command */
                        cmd->result = status;
 
                        /*
                         * Remove the internal command from the pending list
                         */
                        list_del_init(&scb->list);
                        scb->state = SCB_FREE;
                }
                else {
                        mega_free_scb(adapter, scb);
                }
 
                /*
                 * Call the mid-layer callback for this command
                 */
                cmd->scsi_done(cmd);
        }
}
 
 
/*
 * 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_BULK_DATA:
                pci_unmap_page(adapter->dev, scb->dma_h_bulkdata,
                        scb->cmd->request_bufflen, scb->dma_direction);
 
                if( scb->dma_direction == PCI_DMA_FROMDEVICE ) {
                        pci_dma_sync_single(adapter->dev, scb->dma_h_bulkdata,
                                        scb->cmd->request_bufflen,
                                        PCI_DMA_FROMDEVICE);
                }
 
                break;
 
        case MEGA_SGLIST:
                pci_unmap_sg(adapter->dev, scb->cmd->request_buffer,
                        scb->cmd->use_sg, scb->dma_direction);
 
                if( scb->dma_direction == PCI_DMA_FROMDEVICE ) {
                        pci_dma_sync_sg(adapter->dev, scb->cmd->request_buffer,
                                        scb->cmd->use_sg, PCI_DMA_FROMDEVICE);
                }
 
                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);
}
 
 
/*
 * Wait until the controller's mailbox is available
 */
static inline int
mega_busywait_mbox (adapter_t *adapter)
{
        if (adapter->mbox->busy)
                return __mega_busywait_mbox(adapter);
        return 0;
}
 
static int
__mega_busywait_mbox (adapter_t *adapter)
{
        volatile mbox_t *mbox = adapter->mbox;
        long counter;
 
        for (counter = 0; counter < 10000; counter++) {
                if (!mbox->busy)
                        return 0;
                udelay(100); yield();
        }
        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      *sgl;
        struct page     *page;
        unsigned long   offset;
        Scsi_Cmnd       *cmd;
        int     sgcnt;
        int     idx;
 
        cmd = scb->cmd;
 
        /* Scatter-gather not used */
        if( !cmd->use_sg ) {
 
                page = virt_to_page(cmd->request_buffer);
 
                offset = ((unsigned long)cmd->request_buffer & ~PAGE_MASK);
 
                scb->dma_h_bulkdata = pci_map_page(adapter->dev, page, offset,
                                                  cmd->request_bufflen,
                                                  scb->dma_direction);
                scb->dma_type = MEGA_BULK_DATA;
 
                /*
                 * We need to handle special 64-bit commands that need a
                 * minimum of 1 SG
                 */
                if( adapter->has_64bit_addr ) {
                        scb->sgl64[0].address = scb->dma_h_bulkdata;
                        scb->sgl64[0].length = cmd->request_bufflen;
                        *buf = (u32)scb->sgl_dma_addr;
                        *len = (u32)cmd->request_bufflen;
                        return 1;
                }
                else {
                        *buf = (u32)scb->dma_h_bulkdata;
                        *len = (u32)cmd->request_bufflen;
                }
 
                if( scb->dma_direction == PCI_DMA_TODEVICE ) {
                        pci_dma_sync_single(adapter->dev,
                                        scb->dma_h_bulkdata,
                                        cmd->request_bufflen,
                                        PCI_DMA_TODEVICE);
                }
 
                return 0;
        }
 
        sgl = (struct scatterlist *)cmd->request_buffer;
 
        /*
         * Copy Scatter-Gather list info into controller structure.
         *
         * The number of sg elements returned must not exceed our limit
         */
        sgcnt = pci_map_sg(adapter->dev, sgl, cmd->use_sg, scb->dma_direction);
 
        scb->dma_type = MEGA_SGLIST;
 
        if( sgcnt > adapter->sglen ) BUG();
 
        for( idx = 0; idx < sgcnt; idx++, sgl++ ) {
 
                if( adapter->has_64bit_addr ) {
                        scb->sgl64[idx].address = sg_dma_address(sgl);
                        scb->sgl64[idx].length = sg_dma_len(sgl);
                }
                else {
                        scb->sgl[idx].address = sg_dma_address(sgl);
                        scb->sgl[idx].length = sg_dma_len(sgl);
                }
        }
 
        /* Reset pointer and length fields */
        *buf = scb->sgl_dma_addr;
 
        /*
         * For passthru command, dataxferlen must be set, even for commands
         * with a sg list
         */
        *len = (u32)cmd->request_bufflen;
 
        if( scb->dma_direction == PCI_DMA_TODEVICE ) {
                pci_dma_sync_sg(adapter->dev, cmd->request_buffer,
                                cmd->use_sg, PCI_DMA_TODEVICE);
        }
 
        /* 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];
}
 
 
/*
 * Release the controller's resources
 */
static int
megaraid_release(struct Scsi_Host *host)
{
        adapter_t       *adapter;
        mbox_t  *mbox;
        u_char  raw_mbox[sizeof(mbox_t)];
#ifdef CONFIG_PROC_FS
        char    buf[12] = { 0 };
#endif
 
        adapter = (adapter_t *)host->hostdata;
        mbox = (mbox_t *)raw_mbox;
 
        printk(KERN_NOTICE "megaraid: being unloaded...");
 
        /* Flush adapter cache */
        memset(raw_mbox, 0, sizeof(raw_mbox));
        raw_mbox[0] = FLUSH_ADAPTER;
 
        irq_disable(adapter);
        free_irq(adapter->host->irq, adapter);
 
        /* Issue a blocking (interrupts disabled) command to the card */
        issue_scb_block(adapter, raw_mbox);
 
        /* Flush disks cache */
        memset(raw_mbox, 0, sizeof(raw_mbox));
        raw_mbox[0] = FLUSH_SYSTEM;
 
        /* Issue a blocking (interrupts disabled) command to the card */
        issue_scb_block(adapter, raw_mbox);
 
 
        /* Free our resources */
        if( adapter->flag & BOARD_MEMMAP ) {
                iounmap((void *)adapter->base);
                release_mem_region(adapter->host->base, 128);
        }
        else {
                release_region(adapter->base, 16);
        }
 
        mega_free_sgl(adapter);
 
#ifdef CONFIG_PROC_FS
        if( adapter->controller_proc_dir_entry ) {
                remove_proc_entry("stat", adapter->controller_proc_dir_entry);
                remove_proc_entry("config",
                                adapter->controller_proc_dir_entry);
                remove_proc_entry("mailbox",
                                adapter->controller_proc_dir_entry);
#if MEGA_HAVE_ENH_PROC
                remove_proc_entry("rebuild-rate",
                                adapter->controller_proc_dir_entry);
                remove_proc_entry("battery-status",
                                adapter->controller_proc_dir_entry);
 
                remove_proc_entry("diskdrives-ch0",
                                adapter->controller_proc_dir_entry);
                remove_proc_entry("diskdrives-ch1",
                                adapter->controller_proc_dir_entry);
                remove_proc_entry("diskdrives-ch2",
                                adapter->controller_proc_dir_entry);
                remove_proc_entry("diskdrives-ch3",
                                adapter->controller_proc_dir_entry);
 
                remove_proc_entry("raiddrives-0-9",
                                adapter->controller_proc_dir_entry);
                remove_proc_entry("raiddrives-10-19",
                                adapter->controller_proc_dir_entry);
                remove_proc_entry("raiddrives-20-29",
                                adapter->controller_proc_dir_entry);
                remove_proc_entry("raiddrives-30-39",
                                adapter->controller_proc_dir_entry);
#endif
 
                sprintf(buf, "hba%d", adapter->host->host_no);
                remove_proc_entry(buf, mega_proc_dir_entry);
        }
#endif
 
        pci_free_consistent(adapter->dev, MEGA_BUFFER_SIZE,
                        adapter->mega_buffer, adapter->buf_dma_handle);
        kfree(adapter->scb_list);
        pci_free_consistent(adapter->dev, sizeof(mbox64_t),
                        (void *)adapter->una_mbox64, adapter->una_mbox64_dma);
 
        hba_count--;
 
        if( hba_count == 0 ) {
 
                /*
                 * Unregister the character device interface to the driver.
                 */
                unregister_chrdev(major, "megadev");
 
                unregister_reboot_notifier(&mega_notifier);
 
#ifdef CONFIG_PROC_FS
                if( adapter->controller_proc_dir_entry ) {
                        remove_proc_entry ("megaraid", &proc_root);
                }
#endif
 
        }
 
        /*
         * Release the controller memory. A word of warning this frees
         * hostdata and that includes adapter-> so be careful what you
         * dereference beyond this point
         */
        scsi_unregister(host);
 
 
        printk("ok.\n");
 
        return 0;
}
 
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,
                 adapter->host->max_lun);
        return buffer;
}
 
/* shouldn't be used, but included for completeness */
static int
megaraid_command (Scsi_Cmnd *cmd)
{
        printk(KERN_WARNING
        "megaraid critcal error: synchronous interface is not implemented.\n");
 
        cmd->result = (DID_ERROR << 16);
        cmd->scsi_done(cmd);
 
        return 1;
}
 
 
/**
 * megaraid_abort - abort the scsi command
 * @scp - command to be aborted
 *
 * 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(Scsi_Cmnd *scp)
{
        adapter_t               *adapter;
        struct list_head        *pos, *next;
        scb_t                   *scb;
        long                    iter;
        int                     rval = SUCCESS;
 
        adapter = (adapter_t *)scp->host->hostdata;
 
        ASSERT( spin_is_locked(adapter->host_lock) );
 
        printk("megaraid: aborting-%ld cmd=%x <c=%d t=%d l=%d>\n",
                scp->serial_number, scp->cmnd[0], scp->channel, scp->target,
                scp->lun);
 
 
        list_for_each_safe( pos, next, &adapter->pending_list ) {
 
                scb = list_entry(pos, scb_t, list);
 
                if( scb->cmd == scp ) { /* Found command */
 
                        scb->state |= SCB_ABORT;
 
                        /*
                         * Check if this command was never issued. If this is
                         * the case, take it off from the pending list and
                         * complete.
                         */
                        if( !(scb->state & SCB_ISSUED) ) {
 
                                printk(KERN_WARNING
                                "megaraid: %ld:%d, driver owner.\n",
                                        scp->serial_number, scb->idx);
 
                                scp->result = (DID_ABORT << 16);
 
                                mega_free_scb(adapter, scb);
 
                                scp->scsi_done(scp);
 
                                break;
                        }
                }
        }
 
        /*
         * By this time, either all commands are completed or aborted by
         * mid-layer. Do not return until all the commands are actually
         * completed by the firmware
         */
        iter = 0;
        while( atomic_read(&adapter->pend_cmds) > 0 ) {
                /*
                 * Perform the ack sequence, since interrupts are not
                 * available right now!
                 */
                if( adapter->flag & BOARD_MEMMAP ) {
                        megaraid_memmbox_ack_sequence(adapter);
                }
                else {
                        megaraid_iombox_ack_sequence(adapter);
                }
 
                /*
                 * print a message once every second only
                 */
                if( !(iter % 1000) ) {
                        printk(
                        "megaraid: Waiting for %d commands to flush: iter:%ld\n",
                                atomic_read(&adapter->pend_cmds), iter);
                }
 
                if( iter++ < MBOX_ABORT_SLEEP*1000 ) {
                        mdelay(1);
                }
                else {
                        printk(KERN_WARNING
                                "megaraid: critical hardware error!\n");
 
                        rval = FAILED;
 
                        break;
                }
        }
 
        if( rval == SUCCESS ) {
                printk(KERN_INFO
                        "megaraid: abort sequence successfully completed.\n");
        }
 
        return rval;
}
 
 
static int
megaraid_reset(Scsi_Cmnd *cmd)
{
        adapter_t       *adapter;
        megacmd_t       mc;
        long            iter;
        int             rval = SUCCESS;
 
        adapter = (adapter_t *)cmd->host->hostdata;
 
        ASSERT( spin_is_locked(adapter->host_lock) );
 
        printk("megaraid: reset-%ld cmd=%x <c=%d t=%d l=%d>\n",
                cmd->serial_number, cmd->cmnd[0], cmd->channel, cmd->target,
                cmd->lun);
 
 
#if MEGA_HAVE_CLUSTERING
        mc.cmd = MEGA_CLUSTER_CMD;
        mc.opcode = MEGA_RESET_RESERVATIONS;
 
        spin_unlock_irq(adapter->host_lock);
        if( mega_internal_command(adapter, LOCK_INT, &mc, NULL) != 0 ) {
                printk(KERN_WARNING
                                "megaraid: reservation reset failed.\n");
        }
        else {
                printk(KERN_INFO "megaraid: reservation reset.\n");
        }
        spin_lock_irq(adapter->host_lock);
#endif
 
        /*
         * Do not return until all the commands are actually completed by the
         * firmware
         */
        iter = 0;
        while( atomic_read(&adapter->pend_cmds) > 0 ) {
                /*
                 * Perform the ack sequence, since interrupts are not
                 * available right now!
                 */
                if( adapter->flag & BOARD_MEMMAP ) {
                        megaraid_memmbox_ack_sequence(adapter);
                }
                else {
                        megaraid_iombox_ack_sequence(adapter);
                }
 
                /*
                 * print a message once every second only
                 */
                if( !(iter % 1000) ) {
                        printk(
                        "megaraid: Waiting for %d commands to flush: iter:%ld\n",
                                atomic_read(&adapter->pend_cmds), iter);
                }
 
                if( iter++ < MBOX_RESET_SLEEP*1000 ) {
                        mdelay(1);
                }
                else {
                        printk(KERN_WARNING
                                "megaraid: critical hardware error!\n");
 
                        rval = FAILED;
 
                        break;
                }
        }
 
        if( rval == SUCCESS ) {
                printk(KERN_INFO
                        "megaraid: reset sequence successfully completed.\n");
        }
 
        return rval;
}
 
 
#ifdef CONFIG_PROC_FS
/* Following code handles /proc fs  */
 
#define CREATE_READ_PROC(string, func)  create_proc_read_entry(string,  \
                                        S_IRUSR | S_IFREG,              \
                                        controller_proc_dir_entry,      \
                                        func, adapter)
 
/**
 * 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)
{
        struct proc_dir_entry   *controller_proc_dir_entry = NULL;
        u8              string[64] = { 0 };
        adapter_t       *adapter = hba_soft_state[index];
 
        sprintf(string, "hba%d", adapter->host->host_no);
 
        controller_proc_dir_entry =
                adapter->controller_proc_dir_entry = proc_mkdir(string, parent);
 
        if(!controller_proc_dir_entry) {
                printk(KERN_WARNING "\nmegaraid: proc_mkdir failed\n");
                return;
        }
        adapter->proc_read = CREATE_READ_PROC("config", proc_read_config);
        adapter->proc_stat = CREATE_READ_PROC("stat", proc_read_stat);
        adapter->proc_mbox = CREATE_READ_PROC("mailbox", proc_read_mbox);
#if MEGA_HAVE_ENH_PROC
        adapter->proc_rr = CREATE_READ_PROC("rebuild-rate", proc_rebuild_rate);
        adapter->proc_battery = CREATE_READ_PROC("battery-status",
                        proc_battery);
 
        /*
         * Display each physical drive on its channel
         */
        adapter->proc_pdrvstat[0] = CREATE_READ_PROC("diskdrives-ch0",
                                        proc_pdrv_ch0);
        adapter->proc_pdrvstat[1] = CREATE_READ_PROC("diskdrives-ch1",
                                        proc_pdrv_ch1);
        adapter->proc_pdrvstat[2] = CREATE_READ_PROC("diskdrives-ch2",
                                        proc_pdrv_ch2);
        adapter->proc_pdrvstat[3] = CREATE_READ_PROC("diskdrives-ch3",
                                        proc_pdrv_ch3);
 
        /*
         * Display a set of up to 10 logical drive through each of following
         * /proc entries
         */
        adapter->proc_rdrvstat[0] = CREATE_READ_PROC("raiddrives-0-9",
                                        proc_rdrv_10);
        adapter->proc_rdrvstat[1] = CREATE_READ_PROC("raiddrives-10-19",
                                        proc_rdrv_20);
        adapter->proc_rdrvstat[2] = CREATE_READ_PROC("raiddrives-20-29",
                                        proc_rdrv_30);
        adapter->proc_rdrvstat[3] = CREATE_READ_PROC("raiddrives-30-39",
                                        proc_rdrv_40);
#endif
}
 
 
/**
 * proc_read_config()
 * @page - buffer to write the data in
 * @start - where the actual data has been written in page
 * @offset - same meaning as the read system call
 * @count - same meaning as the read system call
 * @eof - set if no more data needs to be returned
 * @data - pointer to our soft state
 *
 * Display configuration information about the controller.
 */
static int
proc_read_config(char *page, char **start, off_t offset, int count, int *eof,
                void *data)
{
 
        adapter_t *adapter = (adapter_t *)data;
        int len = 0;
 
        len += sprintf(page+len, "%s", MEGARAID_VERSION);
 
        if(adapter->product_info.product_name[0])
                len += sprintf(page+len, "%s\n",
                                adapter->product_info.product_name);
 
        len += sprintf(page+len, "Controller Type: ");
 
        if( adapter->flag & BOARD_MEMMAP ) {
                len += sprintf(page+len,
                        "438/466/467/471/493/518/520/531/532\n");
        }
        else {
                len += sprintf(page+len,
                        "418/428/434\n");
        }
 
        if(adapter->flag & BOARD_40LD) {
                len += sprintf(page+len,
                                "Controller Supports 40 Logical Drives\n");
        }
 
        if(adapter->flag & BOARD_64BIT) {
                len += sprintf(page+len,
                "Controller capable of 64-bit memory addressing\n");
        }
        if( adapter->has_64bit_addr ) {
                len += sprintf(page+len,
                        "Controller using 64-bit memory addressing\n");
        }
        else {
                len += sprintf(page+len,
                        "Controller is not using 64-bit memory addressing\n");
        }
 
        len += sprintf(page+len, "Base = %08lx, Irq = %d, ", adapter->base,
                        adapter->host->irq);
 
        len += sprintf(page+len, "Initial Logical Drives = %d, Channels = %d\n",
                        adapter->numldrv, adapter->product_info.nchannels);
 
        len += sprintf(page+len, "Version =%s:%s, DRAM = %dMb\n",
                        adapter->fw_version, adapter->bios_version,
                        adapter->product_info.dram_size);
 
        len += sprintf(page+len,
                "Controller Queue Depth = %d, Driver Queue Depth = %d\n",
                adapter->product_info.max_commands, adapter->max_cmds);
 
        len += sprintf(page+len, "support_ext_cdb    = %d\n",
                        adapter->support_ext_cdb);
        len += sprintf(page+len, "support_random_del = %d\n",
                        adapter->support_random_del);
        len += sprintf(page+len, "boot_ldrv_enabled  = %d\n",
                        adapter->boot_ldrv_enabled);
        len += sprintf(page+len, "boot_ldrv          = %d\n",
                        adapter->boot_ldrv);
        len += sprintf(page+len, "boot_pdrv_enabled  = %d\n",
                        adapter->boot_pdrv_enabled);
        len += sprintf(page+len, "boot_pdrv_ch       = %d\n",
                        adapter->boot_pdrv_ch);
        len += sprintf(page+len, "boot_pdrv_tgt      = %d\n",
                        adapter->boot_pdrv_tgt);
        len += sprintf(page+len, "quiescent          = %d\n",
                        atomic_read(&adapter->quiescent));
        len += sprintf(page+len, "has_cluster        = %d\n",
                        adapter->has_cluster);
 
        len += sprintf(page+len, "\nModule Parameters:\n");
        len += sprintf(page+len, "max_cmd_per_lun    = %d\n",
                        max_cmd_per_lun);
        len += sprintf(page+len, "max_sectors_per_io = %d\n",
                        max_sectors_per_io);
 
        *eof = 1;
 
        return len;
}
 
 
 
/**
 * proc_read_stat()
 * @page - buffer to write the data in
 * @start - where the actual data has been written in page
 * @offset - same meaning as the read system call
 * @count - same meaning as the read system call
 * @eof - set if no more data needs to be returned
 * @data - pointer to our soft state
 *
 * Diaplay statistical information about the I/O activity.
 */
static int
proc_read_stat(char *page, char **start, off_t offset, int count, int *eof,
                void *data)
{
        adapter_t       *adapter;
        int     len;
        int     i;
 
        i = 0;   /* avoid compilation warnings */
        len = 0;
        adapter = (adapter_t *)data;
 
        len = sprintf(page, "Statistical Information for this controller\n");
        len += sprintf(page+len, "pend_cmds = %d\n",
                        atomic_read(&adapter->pend_cmds));
#if MEGA_HAVE_STATS
        for(i = 0; i < adapter->numldrv; i++) {
                len += sprintf(page+len, "Logical Drive %d:\n", i);
 
                len += sprintf(page+len,
                        "\tReads Issued = %lu, Writes Issued = %lu\n",
                        adapter->nreads[i], adapter->nwrites[i]);
 
                len += sprintf(page+len,
                        "\tSectors Read = %lu, Sectors Written = %lu\n",
                        adapter->nreadblocks[i], adapter->nwriteblocks[i]);
 
                len += sprintf(page+len,
                        "\tRead errors = %lu, Write errors = %lu\n\n",
                        adapter->rd_errors[i], adapter->wr_errors[i]);
        }
#else
        len += sprintf(page+len,
                        "IO and error counters not compiled in driver.\n");
#endif
 
        *eof = 1;
 
        return len;
}
 
 
/**
 * proc_read_mbox()
 * @page - buffer to write the data in
 * @start - where the actual data has been written in page
 * @offset - same meaning as the read system call
 * @count - same meaning as the read system call
 * @eof - set if no more data needs to be returned
 * @data - pointer to our soft state
 *
 * Display mailbox information for the last command issued. This information
 * is good for debugging.
 */
static int
proc_read_mbox(char *page, char **start, off_t offset, int count, int *eof,
                void *data)
{
 
        adapter_t       *adapter = (adapter_t *)data;
        volatile mbox_t *mbox = adapter->mbox;
        int     len = 0;
 
        len = sprintf(page, "Contents of Mail Box Structure\n");
        len += sprintf(page+len, "  Fw Command   = 0x%02x\n", mbox->cmd);
        len += sprintf(page+len, "  Cmd Sequence = 0x%02x\n", mbox->cmdid);
        len += sprintf(page+len, "  No of Sectors= %04d\n", mbox->numsectors);
        len += sprintf(page+len, "  LBA          = 0x%02x\n", mbox->lba);
        len += sprintf(page+len, "  DTA          = 0x%08x\n", mbox->xferaddr);
        len += sprintf(page+len, "  Logical Drive= 0x%02x\n", mbox->logdrv);
        len += sprintf(page+len, "  No of SG Elmt= 0x%02x\n",
                        mbox->numsgelements);
        len += sprintf(page+len, "  Busy         = %01x\n", mbox->busy);
        len += sprintf(page+len, "  Status       = 0x%02x\n", mbox->status);
 
        *eof = 1;
 
        return len;
}
 
 
/**
 * proc_rebuild_rate()
 * @page - buffer to write the data in
 * @start - where the actual data has been written in page
 * @offset - same meaning as the read system call
 * @count - same meaning as the read system call
 * @eof - set if no more data needs to be returned
 * @data - pointer to our soft state
 *
 * Display current rebuild rate
 */
static int
proc_rebuild_rate(char *page, char **start, off_t offset, int count, int *eof,
                void *data)
{
        adapter_t       *adapter = (adapter_t *)data;
        dma_addr_t      dma_handle;
        caddr_t         inquiry;
        struct pci_dev  *pdev;
        int     len = 0;
 
        pdev = adapter->dev;
 
        if( (inquiry = mega_allocate_inquiry(&dma_handle, pdev)) == NULL ) {
                *eof = 1;
                return len;
        }
 
        if( mega_adapinq(adapter, dma_handle) != 0 ) {
 
                len = sprintf(page, "Adapter inquiry failed.\n");
 
                printk(KERN_WARNING "megaraid: inquiry failed.\n");
 
                mega_free_inquiry(inquiry, dma_handle, pdev);
 
                *eof = 1;
 
                return len;
        }
 
        if( adapter->flag & BOARD_40LD ) {
                len = sprintf(page, "Rebuild Rate: [%d%%]\n",
                        ((mega_inquiry3 *)inquiry)->rebuild_rate);
        }
        else {
                len = sprintf(page, "Rebuild Rate: [%d%%]\n",
                        ((mraid_ext_inquiry *)
                        inquiry)->raid_inq.adapter_info.rebuild_rate);
        }
 
 
        mega_free_inquiry(inquiry, dma_handle, pdev);
 
        *eof = 1;
 
        return len;
}
 
 
/**
 * proc_battery()
 * @page - buffer to write the data in
 * @start - where the actual data has been written in page
 * @offset - same meaning as the read system call
 * @count - same meaning as the read system call
 * @eof - set if no more data needs to be returned
 * @data - pointer to our soft state
 *
 * Display information about the battery module on the controller.
 */
static int
proc_battery(char *page, char **start, off_t offset, int count, int *eof,
                void *data)
{
        adapter_t       *adapter = (adapter_t *)data;
        dma_addr_t      dma_handle;
        caddr_t         inquiry;
        struct pci_dev  *pdev;
        u8      battery_status = 0;
        char    str[256];
        int     len = 0;
 
        pdev = adapter->dev;
 
        if( (inquiry = mega_allocate_inquiry(&dma_handle, pdev)) == NULL ) {
                *eof = 1;
                return len;
        }
 
        if( mega_adapinq(adapter, dma_handle) != 0 ) {
 
                len = sprintf(page, "Adapter inquiry failed.\n");
 
                printk(KERN_WARNING "megaraid: inquiry failed.\n");
 
                mega_free_inquiry(inquiry, dma_handle, pdev);
 
                *eof = 1;
 
                return len;
        }
 
        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
         */
        sprintf(str, "Battery Status:[%d]", battery_status);
 
        if(battery_status == MEGA_BATT_CHARGE_DONE)
                strcat(str, " Charge Done");
 
        if(battery_status & MEGA_BATT_MODULE_MISSING)
                strcat(str, " Module Missing");
 
        if(battery_status & MEGA_BATT_LOW_VOLTAGE)
                strcat(str, " Low Voltage");
 
        if(battery_status & MEGA_BATT_TEMP_HIGH)
                strcat(str, " Temperature High");
 
        if(battery_status & MEGA_BATT_PACK_MISSING)
                strcat(str, " Pack Missing");
 
        if(battery_status & MEGA_BATT_CHARGE_INPROG)
                strcat(str, " Charge In-progress");
 
        if(battery_status & MEGA_BATT_CHARGE_FAIL)
                strcat(str, " Charge Fail");
 
        if(battery_status & MEGA_BATT_CYCLES_EXCEEDED)
                strcat(str, " Cycles Exceeded");
 
        len = sprintf(page, "%s\n", str);
 
 
        mega_free_inquiry(inquiry, dma_handle, pdev);
 
        *eof = 1;
 
        return len;
}
 
 
/**
 * proc_pdrv_ch0()
 * @page - buffer to write the data in
 * @start - where the actual data has been written in page
 * @offset - same meaning as the read system call
 * @count - same meaning as the read system call
 * @eof - set if no more data needs to be returned
 * @data - pointer to our soft state
 *
 * Display information about the physical drives on physical channel 0.
 */
static int
proc_pdrv_ch0(char *page, char **start, off_t offset, int count, int *eof,
                void *data)
{
        adapter_t *adapter = (adapter_t *)data;
 
        *eof = 1;
 
        return (proc_pdrv(adapter, page, 0));
}
 
 
/**
 * proc_pdrv_ch1()
 * @page - buffer to write the data in
 * @start - where the actual data has been written in page
 * @offset - same meaning as the read system call
 * @count - same meaning as the read system call
 * @eof - set if no more data needs to be returned
 * @data - pointer to our soft state
 *
 * Display information about the physical drives on physical channel 1.
 */
static int
proc_pdrv_ch1(char *page, char **start, off_t offset, int count, int *eof,
                void *data)
{
        adapter_t *adapter = (adapter_t *)data;
 
        *eof = 1;
 
        return (proc_pdrv(adapter, page, 1));
}
 
 
/**
 * proc_pdrv_ch2()
 * @page - buffer to write the data in
 * @start - where the actual data has been written in page
 * @offset - same meaning as the read system call
 * @count - same meaning as the read system call
 * @eof - set if no more data needs to be returned
 * @data - pointer to our soft state
 *
 * Display information about the physical drives on physical channel 2.
 */
static int
proc_pdrv_ch2(char *page, char **start, off_t offset, int count, int *eof,
                void *data)
{
        adapter_t *adapter = (adapter_t *)data;
 
        *eof = 1;
 
        return (proc_pdrv(adapter, page, 2));
}
 
 
/**
 * proc_pdrv_ch3()
 * @page - buffer to write the data in
 * @start - where the actual data has been written in page
 * @offset - same meaning as the read system call
 * @count - same meaning as the read system call
 * @eof - set if no more data needs to be returned
 * @data - pointer to our soft state
 *
 * Display information about the physical drives on physical channel 3.
 */
static int
proc_pdrv_ch3(char *page, char **start, off_t offset, int count, int *eof,
                void *data)
{
        adapter_t *adapter = (adapter_t *)data;
 
        *eof = 1;
 
        return (proc_pdrv(adapter, page, 3));
}
 
 
/**
 * proc_pdrv()
 * @page - buffer to write the data in
 * @adapter - pointer to our soft state
 *
 * Display information about the physical drives.
 */
static int
proc_pdrv(adapter_t *adapter, char *page, 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     len = 0;
        char    str[80];
        int     i;
 
        pdev = adapter->dev;
 
        if( (inquiry = mega_allocate_inquiry(&dma_handle, pdev)) == NULL ) {
                return len;
        }
 
        if( mega_adapinq(adapter, dma_handle) != 0 ) {
 
                len = sprintf(page, "Adapter inquiry failed.\n");
 
                printk(KERN_WARNING "megaraid: inquiry failed.\n");
 
                mega_free_inquiry(inquiry, dma_handle, pdev);
 
                return len;
        }
 
 
        scsi_inq = pci_alloc_consistent(pdev, 256, &scsi_inq_dma_handle);
 
        if( scsi_inq == NULL ) {
                len = sprintf(page, "memory not available for scsi inq.\n");
 
                mega_free_inquiry(inquiry, dma_handle, pdev);
 
                return len;
        }
 
        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 ) return 0;
 
        for( tgt = 0; tgt <= MAX_TARGET; tgt++ ) {
 
                i = channel*16 + tgt;
 
                state = *(pdrv_state + i);
 
                switch( state & 0x0F ) {
 
                case PDRV_ONLINE:
                        sprintf(str, "Channel:%2d Id:%2d State: Online",
                                channel, tgt);
                        break;
 
                case PDRV_FAILED:
                        sprintf(str, "Channel:%2d Id:%2d State: Failed",
                                channel, tgt);
                        break;
 
                case PDRV_RBLD:
                        sprintf(str, "Channel:%2d Id:%2d State: Rebuild",
                                channel, tgt);
                        break;
 
                case PDRV_HOTSPARE:
                        sprintf(str, "Channel:%2d Id:%2d State: Hot spare",
                                channel, tgt);
                        break;
 
                default:
                        sprintf(str, "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
                 */
                if( (len + 240) >= PAGE_SIZE ) break;
 
                len += sprintf(page+len, "%s.\n", str);
 
                len += mega_print_inquiry(page+len, scsi_inq);
        }
 
        pci_free_consistent(pdev, 256, scsi_inq, scsi_inq_dma_handle);
 
        mega_free_inquiry(inquiry, dma_handle, pdev);
 
        return len;
}
 
 
/*
 * Display scsi inquiry
 */
static int
mega_print_inquiry(char *page, char *scsi_inq)
{
        int     len = 0;
        int     i;
 
        len = sprintf(page, "  Vendor: ");
        for( i = 8; i < 16; i++ ) {
                len += sprintf(page+len, "%c", scsi_inq[i]);
        }
 
        len += sprintf(page+len, "  Model: ");
 
        for( i = 16; i < 32; i++ ) {
                len += sprintf(page+len, "%c", scsi_inq[i]);
        }
 
        len += sprintf(page+len, "  Rev: ");
 
        for( i = 32; i < 36; i++ ) {
                len += sprintf(page+len, "%c", scsi_inq[i]);
        }
 
        len += sprintf(page+len, "\n");
 
        i = scsi_inq[0] & 0x1f;
 
        len += sprintf(page+len, "  Type:   %s ",
                i < MAX_SCSI_DEVICE_CODE ? scsi_device_types[i] :
                   "Unknown          ");
 
        len += sprintf(page+len,
        "                 ANSI SCSI revision: %02x", scsi_inq[2] & 0x07);
 
        if( (scsi_inq[2] & 0x07) == 1 && (scsi_inq[3] & 0x0f) == 1 )
                len += sprintf(page+len, " CCS\n");
        else
                len += sprintf(page+len, "\n");
 
        return len;
}
 
 
/**
 * proc_rdrv_10()
 * @page - buffer to write the data in
 * @start - where the actual data has been written in page
 * @offset - same meaning as the read system call
 * @count - same meaning as the read system call
 * @eof - set if no more data needs to be returned
 * @data - pointer to our soft state
 *
 * Display real time information about the logical drives 0 through 9.
 */
static int
proc_rdrv_10(char *page, char **start, off_t offset, int count, int *eof,
                void *data)
{
        adapter_t *adapter = (adapter_t *)data;
 
        *eof = 1;
 
        return (proc_rdrv(adapter, page, 0, 9));
}
 
 
/**
 * proc_rdrv_20()
 * @page - buffer to write the data in
 * @start - where the actual data has been written in page
 * @offset - same meaning as the read system call
 * @count - same meaning as the read system call
 * @eof - set if no more data needs to be returned
 * @data - pointer to our soft state
 *
 * Display real time information about the logical drives 10 through 19.
 */
static int
proc_rdrv_20(char *page, char **start, off_t offset, int count, int *eof,
                void *data)
{
        adapter_t *adapter = (adapter_t *)data;
 
        *eof = 1;
 
        return (proc_rdrv(adapter, page, 10, 19));
}
 
 
/**
 * proc_rdrv_30()
 * @page - buffer to write the data in
 * @start - where the actual data has been written in page
 * @offset - same meaning as the read system call
 * @count - same meaning as the read system call
 * @eof - set if no more data needs to be returned
 * @data - pointer to our soft state
 *
 * Display real time information about the logical drives 20 through 29.
 */
static int
proc_rdrv_30(char *page, char **start, off_t offset, int count, int *eof,
                void *data)
{
        adapter_t *adapter = (adapter_t *)data;
 
        *eof = 1;
 
        return (proc_rdrv(adapter, page, 20, 29));
}
 
 
/**
 * proc_rdrv_40()
 * @page - buffer to write the data in
 * @start - where the actual data has been written in page
 * @offset - same meaning as the read system call
 * @count - same meaning as the read system call
 * @eof - set if no more data needs to be returned
 * @data - pointer to our soft state
 *
 * Display real time information about the logical drives 30 through 39.
 */
static int
proc_rdrv_40(char *page, char **start, off_t offset, int count, int *eof,
                void *data)
{
        adapter_t *adapter = (adapter_t *)data;
 
        *eof = 1;
 
        return (proc_rdrv(adapter, page, 30, 39));
}
 
 
/**
 * proc_rdrv()
 * @page - buffer to write the data in
 * @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_rdrv(adapter_t *adapter, char *page, 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     len = 0;
        int     i;
        u8      span8_flag = 1;
 
        pdev = adapter->dev;
 
        if( (inquiry = mega_allocate_inquiry(&dma_handle, pdev)) == NULL ) {
                return len;
        }
 
        if( mega_adapinq(adapter, dma_handle) != 0 ) {
 
                len = sprintf(page, "Adapter inquiry failed.\n");
 
                printk(KERN_WARNING "megaraid: inquiry failed.\n");
 
                mega_free_inquiry(inquiry, dma_handle, pdev);
 
                return len;
        }
 
        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' is either the size of diskarray_span4_t or the
                 * size of disk_array_span8_t. We use span8_t's size because
                 * it is bigger of the two.
                 */
                array_sz = sizeof( diskarray_span8_t );
 
                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 ) {
                len = sprintf(page, "memory not available.\n");
 
                mega_free_inquiry(inquiry, dma_handle, pdev);
 
                return len;
        }
 
        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, LOCK_INT, &mc, NULL) ) {
 
                        len = sprintf(page, "40LD read config failed.\n");
 
                        mega_free_inquiry(inquiry, dma_handle, pdev);
 
                        pci_free_consistent(pdev, array_sz, disk_array,
                                        disk_array_dma_handle);
 
                        return len;
                }
 
        }
        else {
                /*
                 * Try 8-Span "read config" command
                 */
                mc.cmd = NEW_READ_CONFIG_8LD;
 
                if( mega_internal_command(adapter, LOCK_INT, &mc, NULL) ) {
 
                        /*
                         * 8-Span command failed; try 4-Span command
                         */
                        span8_flag = 0;
                        mc.cmd = READ_CONFIG_8LD;
 
                        if( mega_internal_command(adapter, LOCK_INT, &mc,
                                                NULL) ){
 
                                len = sprintf(page,
                                        "8LD read config failed.\n");
 
                                mega_free_inquiry(inquiry, dma_handle, pdev);
 
                                pci_free_consistent(pdev, array_sz,
                                                disk_array,
                                                disk_array_dma_handle);
 
                                return len;
                        }
                }
        }
 
        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 {
                        if( span8_flag ) {
                                lparam = (logdrv_param*) &((diskarray_span8_t*)
                                                (disk_array))->log_drv[i];
                        }
                        else {
                                lparam = (logdrv_param*) &((diskarray_span4_t*)
                                                (disk_array))->log_drv[i];
                        }
                }
 
                /*
                 * Check for overflow. We print less than 240 characters for
                 * information about each logical drive.
                 */
                if( (len + 240) >= PAGE_SIZE ) break;
 
                len += sprintf(page+len, "Logical drive:%2d:, ", i);
 
                switch( rdrv_state[i] & 0x0F ) {
                case RDRV_OFFLINE:
                        len += sprintf(page+len, "state: offline");
                        break;
 
                case RDRV_DEGRADED:
                        len += sprintf(page+len, "state: degraded");
                        break;
 
                case RDRV_OPTIMAL:
                        len += sprintf(page+len, "state: optimal");
                        break;
 
                case RDRV_DELETED:
                        len += sprintf(page+len, "state: deleted");
                        break;
 
                default:
                        len += sprintf(page+len, "state: unknown");
                        break;
                }
 
                /*
                 * Check if check consistency or initialization is going on
                 * for this logical drive.
                 */
                if( (rdrv_state[i] & 0xF0) == 0x20 ) {
                        len += sprintf(page+len,
                                        ", check-consistency in progress");
                }
                else if( (rdrv_state[i] & 0xF0) == 0x10 ) {
                        len += sprintf(page+len,
                                        ", initialization in progress");
                }
 
                len += sprintf(page+len, "\n");
 
                len += sprintf(page+len, "Span depth:%3d, ",
                                lparam->span_depth);
 
                len += sprintf(page+len, "RAID level:%3d, ",
                                lparam->level);
 
                len += sprintf(page+len, "Stripe size:%3d, ",
                                lparam->stripe_sz ? lparam->stripe_sz/2: 128);
 
                len += sprintf(page+len, "Row size:%3d\n",
                                lparam->row_size);
 
 
                len += sprintf(page+len, "Read Policy: ");
 
                switch(lparam->read_ahead) {
 
                case NO_READ_AHEAD:
                        len += sprintf(page+len, "No read ahead, ");
                        break;
 
                case READ_AHEAD:
                        len += sprintf(page+len, "Read ahead, ");
                        break;
 
                case ADAP_READ_AHEAD:
                        len += sprintf(page+len, "Adaptive, ");
                        break;
 
                }
 
                len += sprintf(page+len, "Write Policy: ");
 
                switch(lparam->write_mode) {
 
                case WRMODE_WRITE_THRU:
                        len += sprintf(page+len, "Write thru, ");
                        break;
 
                case WRMODE_WRITE_BACK:
                        len += sprintf(page+len, "Write back, ");
                        break;
                }
 
                len += sprintf(page+len, "Cache Policy: ");
 
                switch(lparam->direct_io) {
 
                case CACHED_IO:
                        len += sprintf(page+len, "Cached IO\n\n");
                        break;
 
                case DIRECT_IO:
                        len += sprintf(page+len, "Direct IO\n\n");
                        break;
                }
        }
 
        mega_free_inquiry(inquiry, dma_handle, pdev);
 
        pci_free_consistent(pdev, array_sz, disk_array,
                        disk_array_dma_handle);
 
        return len;
}
 
#endif
 
 
/**
 * megaraid_biosparam()
 * @disk
 * @dev
 * @geom
 *
 * Return the disk geometry for a particular disk
 * Input:
 *      Disk *disk - Disk geometry
 *      kdev_t dev - Device node
 *      int *geom  - Returns geometry fields
 *              geom[0] = heads
 *              geom[1] = sectors
 *              geom[2] = cylinders
 */
static int
megaraid_biosparam(Disk *disk, kdev_t dev, int *geom)
{
        int heads, sectors, cylinders;
        adapter_t *adapter;
 
        /* Get pointer to host config structure */
        adapter = (adapter_t *)disk->device->host->hostdata;
 
        if (IS_RAID_CH(adapter, disk->device->channel)) {
                        /* Default heads (64) & sectors (32) */
                        heads = 64;
                        sectors = 32;
                        cylinders = disk->capacity / (heads * sectors);
 
                        /*
                         * Handle extended translation size for logical drives
                         * > 1Gb
                         */
                        if (disk->capacity >= 0x200000) {
                                heads = 255;
                                sectors = 63;
                                cylinders = disk->capacity / (heads * sectors);
                        }
 
                        /* return result */
                        geom[0] = heads;
                        geom[1] = sectors;
                        geom[2] = cylinders;
        }
        else {
                if( !mega_partsize(disk, dev, geom) )
                        return 0;
 
                printk(KERN_WARNING
                "megaraid: invalid partition on this disk on channel %d\n",
                                disk->device->channel);
 
                /* Default heads (64) & sectors (32) */
                heads = 64;
                sectors = 32;
                cylinders = disk->capacity / (heads * sectors);
 
                /* Handle extended translation size for logical drives > 1Gb */
                if (disk->capacity >= 0x200000) {
                        heads = 255;
                        sectors = 63;
                        cylinders = disk->capacity / (heads * sectors);
                }
 
                /* return result */
                geom[0] = heads;
                geom[1] = sectors;
                geom[2] = cylinders;
        }
 
        return 0;
}
 
/*
 * mega_partsize()
 * @disk
 * @geom
 *
 * Purpose : to determine the BIOS mapping used to create the partition
 *      table, storing the results (cyls, hds, and secs) in geom
 *
 * Note:        Code is picked from scsicam.h
 *
 * Returns : -1 on failure, 0 on success.
 */
static int
mega_partsize(Disk *disk, kdev_t dev, int *geom)
{
        struct buffer_head *bh;
        struct partition *p, *largest = NULL;
        int i, largest_cyl;
        int heads, cyls, sectors;
        int capacity = disk->capacity;
 
        int ma = MAJOR(dev);
        int mi = (MINOR(dev) & ~0xf);
 
        int block = 1024;
 
        if (blksize_size[ma])
                block = blksize_size[ma][mi];
 
        if (!(bh = bread(MKDEV(ma,mi), 0, block)))
                return -1;
 
        if (*(unsigned short *)(bh->b_data + 510) == 0xAA55 ) {
 
                for (largest_cyl = -1,
                        p = (struct partition *)(0x1BE + bh->b_data), i = 0;
                        i < 4; ++i, ++p) {
 
                        if (!p->sys_ind) continue;
 
                        cyls = p->end_cyl + ((p->end_sector & 0xc0) << 2);
 
                        if (cyls >= largest_cyl) {
                                largest_cyl = cyls;
                                largest = p;
                        }
                }
        }
 
        if (largest) {
                heads = largest->end_head + 1;
                sectors = largest->end_sector & 0x3f;
 
                if (!heads || !sectors) {
                        brelse(bh);
                        return -1;
                }
 
                cyls = capacity/(heads * sectors);
 
                geom[0] = heads;
                geom[1] = sectors;
                geom[2] = cyls;
 
                brelse(bh);
                return 0;
        }
 
        brelse(bh);
        return -1;
}
 
 
/**
 * megaraid_reboot_notify()
 * @this - unused
 * @code - shutdown code
 * @unused - unused
 *
 * This routine will be called when the use has done a forced shutdown on the
 * system. Flush the Adapter and disks cache.
 */
static int
megaraid_reboot_notify (struct notifier_block *this, unsigned long code,
                void *unused)
{
        adapter_t *adapter;
        struct Scsi_Host *host;
        u8 raw_mbox[sizeof(mbox_t)];
        mbox_t *mbox;
        int i;
 
        /*
         * Flush the controller's cache irrespective of the codes coming down.
         * SYS_DOWN, SYS_HALT, SYS_RESTART, SYS_POWER_OFF
         */
        for( i = 0; i < hba_count; i++ ) {
                printk(KERN_INFO "megaraid: flushing adapter %d..", i);
                host = hba_soft_state[i]->host;
 
                adapter = (adapter_t *)host->hostdata;
                mbox = (mbox_t *)raw_mbox;
 
                /* Flush adapter cache */
                memset(raw_mbox, 0, sizeof(raw_mbox));
                raw_mbox[0] = FLUSH_ADAPTER;
 
                irq_disable(adapter);
                free_irq(adapter->host->irq, adapter);
 
                /*
                 * Issue a blocking (interrupts disabled) command to
                 * the card
                 */
                issue_scb_block(adapter, raw_mbox);
 
                /* Flush disks cache */
                memset(raw_mbox, 0, sizeof(raw_mbox));
                raw_mbox[0] = FLUSH_SYSTEM;
 
                issue_scb_block(adapter, raw_mbox);
 
                printk("Done.\n");
 
                if( atomic_read(&adapter->pend_cmds) > 0 ) {
                        printk(KERN_WARNING "megaraid: pending commands!!\n");
                }
        }
 
        /*
         * Have a delibrate delay to make sure all the caches are
         * actually flushed.
         */
        printk(KERN_INFO "megaraid: cache flush delay:   ");
        for( i = 9; i >= 0; i-- ) {
                printk("\b\b\b[%d]", i);
                mdelay(1000);
        }
        printk("\b\b\b[done]\n");
        mdelay(1000);
 
        return NOTIFY_DONE;
}
 
/**
 * 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 ) {
                        printk(KERN_WARNING "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 ) {
                        printk(KERN_WARNING "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 ) {
                        printk(KERN_WARNING
                                "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. If yes, increment the module use count so that it cannot
 * be unloaded.
 */
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;
 
        MOD_INC_USE_COUNT;
        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 inode *inode, struct file *filep, unsigned int cmd,
                unsigned long arg)
{
        adapter_t       *adapter;
        nitioctl_t      uioc;
        int             adapno;
        int             rval;
        mega_passthru   *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      *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 *)arg, &uioc)) != 0 )
                return rval;
 
 
        switch( uioc.opcode ) {
 
        case GET_DRIVER_VER:
                if( put_user(driver_ver, (u32 *)uioc.uioc_uaddr) )
                        return (-EFAULT);
 
                break;
 
        case GET_N_ADAP:
                if( put_user(hba_count, (u32 *)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 = (megastat_t *)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 ) {
                                printk(KERN_WARNING "megaraid: logdrv ");
                                printk("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 *)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 ) {
 
                        printk(KERN_WARNING "megaraid: rejected passthru.\n");
 
                        return (-EINVAL);
                }
 
                /*
                 * For all internal commands, the buffer must be allocated in
                 * <4GB address range
                 */
                pdev = adapter->dev;
 
                /* 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 ) {
                                return (-ENOMEM);
                        }
 
                        /*
                         * The user passthru structure
                         */
                        upthru = (mega_passthru *)MBOX(uioc)->xferaddr;
 
                        /*
                         * Copy in the user passthru here.
                         */
                        if( copy_from_user(pthru, (char *)upthru,
                                                sizeof(mega_passthru)) ) {
 
                                pci_free_consistent(pdev,
                                                sizeof(mega_passthru), pthru,
                                                pthru_dma_hndl);
 
                                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);
 
                                        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 *)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, LOCK_INT, &mc, pthru);
 
                        rval = mega_n_to_m((void *)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 *)uxferaddr, data,
                                                        pthru->dataxferlen) ) {
                                        rval = (-EFAULT);
                                }
                        }
 
                        /*
                         * Send the request sense data also, irrespective of
                         * whether the user has asked for it or not.
                         */
                        copy_to_user(upthru->reqsensearea,
                                        pthru->reqsensearea, 14);
 
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);
 
                        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 ) {
                                        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 *)uxferaddr,
                                                        uioc.xferlen) ) {
 
                                        pci_free_consistent(pdev,
                                                        uioc.xferlen,
                                                        data, data_dma_hndl);
 
                                        return (-EFAULT);
                                }
                        }
 
                        memcpy(&mc, MBOX(uioc), sizeof(megacmd_t));
 
                        mc.xferaddr = (u32)data_dma_hndl;
 
                        /*
                         * Issue the command
                         */
                        mega_internal_command(adapter, LOCK_INT, &mc, NULL);
 
                        rval = mega_n_to_m((void *)arg, &mc);
 
                        if( rval ) {
                                if( uioc.xferlen ) {
                                        pci_free_consistent(pdev,
                                                        uioc.xferlen, data,
                                                        data_dma_hndl);
                                }
 
                                return rval;
                        }
 
                        /*
                         * Is data going up-stream
                         */
                        if( uioc.xferlen && (uioc.flags & UIOC_RD) ) {
                                if( copy_to_user((char *)uxferaddr, data,
                                                        uioc.xferlen) ) {
 
                                        rval = (-EFAULT);
                                }
                        }
 
                        if( uioc.xferlen ) {
                                pci_free_consistent(pdev,
                                                uioc.xferlen, data,
                                                data_dma_hndl);
                        }
 
                        return rval;
                }
 
        default:
                return (-EINVAL);
        }
 
        return 0;
}
 
/**
 * 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 *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
         * begining of the structure.
         */
 
        if( copy_from_user(signature, (char *)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, (char *)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, (char *)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 *arg, megacmd_t *mc)
{
        nitioctl_t      *uiocp;
        megacmd_t       *umc;
        megacmd_t       kmc;
        mega_passthru   *upthru;
        struct uioctl_t *uioc_mimd;
        char    signature[8] = {0};
 
        /*
         * check is the application conforms to NIT.
         */
        if( copy_from_user(signature, (char *)arg, 7) )
                return -EFAULT;
 
        if( memcmp(signature, "MEGANIT", 7) == 0 ) {
 
                uiocp = (nitioctl_t *)arg;
 
                if( put_user(mc->status, (u8 *)&MBOX_P(uiocp)->status) )
                        return (-EFAULT);
 
                if( mc->cmd == MEGA_MBOXCMD_PASSTHRU ) {
 
                        umc = MBOX_P(uiocp);
 
                        upthru = (mega_passthru *)umc->xferaddr;
 
                        if( put_user(mc->status, (u8 *)&upthru->scsistatus) )
                                return (-EFAULT);
                }
        }
        else {
                uioc_mimd = (struct uioctl_t *)arg;
 
                if( put_user(mc->status, (u8 *)&uioc_mimd->mbox[17]) )
                        return (-EFAULT);
 
                if( mc->cmd == MEGA_MBOXCMD_PASSTHRU ) {
 
                        umc = (megacmd_t *)uioc_mimd->mbox;
                        if (copy_from_user(&kmc, umc, sizeof(megacmd_t)))
                                return -EFAULT;
 
                        upthru = (mega_passthru *)kmc.xferaddr;
 
                        if( put_user(mc->status, (u8 *)&upthru->scsistatus) )
                                return (-EFAULT);
                }
        }
 
        return 0;
}
 
 
static int
megadev_close (struct inode *inode, struct file *filep)
{
        MOD_DEC_USE_COUNT;
        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(mbox_t)];
        mbox_t  *mbox;
        int     ret;
 
        mbox = (mbox_t *)raw_mbox;
 
        memset(raw_mbox, 0, sizeof(raw_mbox));
 
        memset((void *)adapter->mega_buffer, 0, MEGA_BUFFER_SIZE);
 
        mbox->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(mbox_t)];
        mbox_t *mbox;
        int i;
 
        mbox = (mbox_t *)raw_mbox;
 
        memset(raw_mbox, 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->xferaddr = (u32)adapter->buf_dma_handle;
 
        /*
         * Non-ROMB firware 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 ) {
                        printk(KERN_INFO "megaraid: channel[%d] is raid.\n",
                                        i);
                }
                else {
                        printk(KERN_INFO "megaraid: 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(mbox_t)];
        mbox_t  *mbox;
        u16     cksum = 0;
        u8      *cksum_p;
        u8      boot_pdrv;
        int     i;
 
        mbox = (mbox_t *)raw_mbox;
 
        memset(raw_mbox, 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->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(mbox_t)];
        mbox_t *mbox;
        int rval;
 
        mbox = (mbox_t *)raw_mbox;
 
        memset(raw_mbox, 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(mbox_t)];
        mbox_t *mbox;
        int rval;
 
        mbox = (mbox_t *)raw_mbox;
 
        memset(raw_mbox, 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)
{
        DECLARE_WAIT_QUEUE_HEAD(wq);
        unsigned long flags;
        scb_t *scb;
        int rval;
 
        ASSERT( !spin_is_locked(adapter->host_lock) );
 
        /*
         * 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 ) {
 
                sleep_on_timeout( &wq, 1*HZ );  /* sleep for 1s */
        }
 
        rval = mega_do_del_logdrv(adapter, logdrv);
 
 
        spin_lock_irqsave(adapter->host_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 (((mbox_t *)scb->raw_mbox)->logdrv < 0x80 )
                                ((mbox_t *)scb->raw_mbox)->logdrv += 0x80 ;
                }
        }
 
        atomic_set(&adapter->quiescent, 0);
 
        mega_runpendq(adapter);
 
        spin_unlock_irqrestore(adapter->host_lock, flags);
 
        return rval;
}
 
 
static int
mega_do_del_logdrv(adapter_t *adapter, int logdrv)
{
        int     rval;
        u8      raw_mbox[sizeof(mbox_t)];
 
        memset(raw_mbox, 0, sizeof(raw_mbox));
 
        raw_mbox[0] = FC_DEL_LOGDRV;
        raw_mbox[2] = OP_DEL_LOGDRV;
        raw_mbox[3] = logdrv;
 
        /* Issue a blocking command to the card */
        rval = issue_scb_block(adapter, raw_mbox);
 
        /* log this event */
        if(rval) {
                printk(KERN_WARNING "megaraid: 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(mbox_t)];
        mbox_t  *mbox;
 
        mbox = (mbox_t *)raw_mbox;
 
        memset(raw_mbox, 0, sizeof(raw_mbox));
 
        memset((void *)adapter->mega_buffer, 0, MEGA_BUFFER_SIZE);
 
        mbox->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(mbox_t)];
        mbox_t  *mbox;
 
        mbox = (mbox_t *)raw_mbox;
 
        memset(raw_mbox, 0, sizeof(raw_mbox));
 
        memset((void *)adapter->mega_buffer, 0, MEGA_BUFFER_SIZE);
 
        mbox->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;
}
 
 
 
/**
 * 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, Scsi_Cmnd *cmd, int channel)
{
        int             tgt;
        int             ldrv_num;
 
        tgt = cmd->target;
 
        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_reorder_hosts()
 *
 * Hack: reorder the scsi hosts in mid-layer so that the controller with the
 * boot device on it appears first in the list.
 */
static void
mega_reorder_hosts(void)
{
        struct Scsi_Host *shpnt;
        struct Scsi_Host *shone;
        struct Scsi_Host *shtwo;
        adapter_t *boot_host;
        int i;
 
        /*
         * Find the (first) host which has it's BIOS enabled
         */
        boot_host = NULL;
        for (i = 0; i < MAX_CONTROLLERS; i++) {
                if (mega_hbas[i].is_bios_enabled) {
                        boot_host = mega_hbas[i].hostdata_addr;
                        break;
                }
        }
 
        if (!boot_host) {
                printk(KERN_NOTICE "megaraid: no BIOS enabled.\n");
                return;
        }
 
        /*
         * Traverse through the list of SCSI hosts for our HBA locations
         */
        shone = shtwo = NULL;
        for (shpnt = scsi_hostlist; shpnt; shpnt = shpnt->next) {
                /* Is it one of ours? */
                for (i = 0; i < MAX_CONTROLLERS; i++) {
                        if ((adapter_t *) shpnt->hostdata ==
                                mega_hbas[i].hostdata_addr) {
                                /* Does this one has BIOS enabled */
                                if (mega_hbas[i].hostdata_addr == boot_host) {
 
                                        /* Are we first */
                                        if (!shtwo)     /* Yes! */
                                                return;
                                        else    /* :-( */
                                                shone = shpnt;
                                } else {
                                        if (!shtwo) {
                                                /* were we here before? xchng
                                                 * first */
                                                shtwo = shpnt;
                                        }
                                }
                                break;
                        }
                }
                /*
                 * Have we got the boot host and one which does not have the
                 * bios enabled.
                 */
                if (shone && shtwo)
                        break;
        }
        if (shone && shtwo) {
                mega_swap_hosts (shone, shtwo);
        }
 
        return;
}
 
 
static void
mega_swap_hosts (struct Scsi_Host *shone, struct Scsi_Host *shtwo)
{
        struct Scsi_Host *prevtoshtwo;
        struct Scsi_Host *prevtoshone;
        struct Scsi_Host *save = NULL;
 
        /* Are these two nodes adjacent */
        if (shtwo->next == shone) {
 
                if (shtwo == scsi_hostlist && !shone->next) {
 
                        /* just two nodes */
                        scsi_hostlist = shone;
                        shone->next = shtwo;
                        shtwo->next = NULL;
                } else if (shtwo == scsi_hostlist) {
                        /* first two nodes of the list */
 
                        scsi_hostlist = shone;
                        shtwo->next = shone->next;
                        scsi_hostlist->next = shtwo;
                } else if (!shone->next) {
                        /* last two nodes of the list */
 
                        prevtoshtwo = scsi_hostlist;
 
                        while (prevtoshtwo->next != shtwo)
                                prevtoshtwo = prevtoshtwo->next;
 
                        prevtoshtwo->next = shone;
                        shone->next = shtwo;
                        shtwo->next = NULL;
                } else {
                        prevtoshtwo = scsi_hostlist;
 
                        while (prevtoshtwo->next != shtwo)
                                prevtoshtwo = prevtoshtwo->next;
 
                        prevtoshtwo->next = shone;
                        shtwo->next = shone->next;
                        shone->next = shtwo;
                }
 
        } else if (shtwo == scsi_hostlist && !shone->next) {
                /* shtwo at head, shone at tail, not adjacent */
 
                prevtoshone = scsi_hostlist;
 
                while (prevtoshone->next != shone)
                        prevtoshone = prevtoshone->next;
 
                scsi_hostlist = shone;
                shone->next = shtwo->next;
                prevtoshone->next = shtwo;
                shtwo->next = NULL;
        } else if (shtwo == scsi_hostlist && shone->next) {
                /* shtwo at head, shone is not at tail */
 
                prevtoshone = scsi_hostlist;
                while (prevtoshone->next != shone)
                        prevtoshone = prevtoshone->next;
 
                scsi_hostlist = shone;
                prevtoshone->next = shtwo;
                save = shtwo->next;
                shtwo->next = shone->next;
                shone->next = save;
        } else if (!shone->next) {
                /* shtwo not at head, shone at tail */
 
                prevtoshtwo = scsi_hostlist;
                prevtoshone = scsi_hostlist;
 
                while (prevtoshtwo->next != shtwo)
                        prevtoshtwo = prevtoshtwo->next;
                while (prevtoshone->next != shone)
                        prevtoshone = prevtoshone->next;
 
                prevtoshtwo->next = shone;
                shone->next = shtwo->next;
                prevtoshone->next = shtwo;
                shtwo->next = NULL;
 
        } else {
                prevtoshtwo = scsi_hostlist;
                prevtoshone = scsi_hostlist;
                save = NULL;
 
                while (prevtoshtwo->next != shtwo)
                        prevtoshtwo = prevtoshtwo->next;
                while (prevtoshone->next != shone)
                        prevtoshone = prevtoshone->next;
 
                prevtoshtwo->next = shone;
                save = shone->next;
                shone->next = shtwo->next;
                prevtoshone->next = shtwo;
                shtwo->next = save;
        }
        return;
}
 
 
 
#ifdef CONFIG_PROC_FS
/**
 * mega_adapinq()
 * @adapter - pointer to our soft state
 * @dma_handle - DMA address of the buffer
 *
 * Issue internal comamnds 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, LOCK_INT, &mc, NULL) != 0 ) {
                return -1;
        }
 
        return 0;
}
 
 
/**
 * mega_allocate_inquiry()
 * @dma_handle - handle returned for dma address
 * @pdev - handle to pci device
 *
 * allocates memory for inquiry structure
 */
static inline caddr_t
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(caddr_t inquiry, dma_addr_t dma_handle, struct pci_dev *pdev)
{
        pci_free_consistent(pdev, sizeof(mega_inquiry3), inquiry, dma_handle);
}
 
 
/** 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
 *
 * Issue the scsi inquiry for the specified device.
 */
static int
mega_internal_dev_inquiry(adapter_t *adapter, u8 ch, u8 tgt,
                dma_addr_t buf_dma_handle)
{
        mega_passthru   *pthru;
        dma_addr_t      pthru_dma_handle;
        megacmd_t       mc;
        int             rval;
        struct pci_dev  *pdev;
 
 
        /*
         * For all internal commands, the buffer must be allocated in <4GB
         * address range
         */
        pdev = adapter->dev;
 
        pthru = pci_alloc_consistent(pdev, sizeof(mega_passthru),
                        &pthru_dma_handle);
 
        if( pthru == NULL ) {
                return -1;
        }
 
        pthru->timeout = 2;
        pthru->ars = 1;
        pthru->reqsenselen = 14;
        pthru->islogical = 0;
 
        pthru->channel = (adapter->flag & BOARD_40LD) ? 0 : ch;
 
        pthru->target = (adapter->flag & BOARD_40LD) ? (ch << 4)|tgt : tgt;
 
        pthru->cdblen = 6;
 
        pthru->cdb[0] = INQUIRY;
        pthru->cdb[1] = 0;
        pthru->cdb[2] = 0;
        pthru->cdb[3] = 0;
        pthru->cdb[4] = 255;
        pthru->cdb[5] = 0;
 
 
        pthru->dataxferaddr = (u32)buf_dma_handle;
        pthru->dataxferlen = 256;
 
        memset(&mc, 0, sizeof(megacmd_t));
 
        mc.cmd = MEGA_MBOXCMD_PASSTHRU;
        mc.xferaddr = (u32)pthru_dma_handle;
 
        rval = mega_internal_command(adapter, LOCK_INT, &mc, pthru);
 
        pci_free_consistent(pdev, sizeof(mega_passthru), pthru,
                        pthru_dma_handle);
 
        return rval;
}
#endif  // #ifdef CONFIG_PROC_FS
 
 
/**
 * mega_internal_command()
 * @adapter - pointer to our soft state
 * @ls - the scope of the exclusion lock.
 * @mc - the mailbox command
 * @pthru - Passthru structure for DCDB commands
 *
 * Issue the internal commands in interrupt mode.
 * The last argument is the address of the passthru structure if the command
 * to be fired is a passthru command
 *
 * lockscope specifies whether the caller has already acquired the lock. Of
 * course, the caller must know which lock we are talking about.
 *
 * Note: parameter 'pthru' is null for non-passthru commands.
 */
static int
mega_internal_command(adapter_t *adapter, lockscope_t ls, megacmd_t *mc,
                mega_passthru *pthru )
{
        Scsi_Cmnd       *scmd;
        unsigned long   flags = 0;
        scb_t   *scb;
        int     rval;
 
        /*
         * The internal commands share one command id and hence are
         * serialized. This is so because we want to reserve maximum number of
         * available command ids for the I/O commands.
         */
        down(&adapter->int_mtx);
 
        scb = &adapter->int_scb;
        memset(scb, 0, sizeof(scb_t));
 
        scmd = &adapter->int_scmd;
        memset(scmd, 0, sizeof(Scsi_Cmnd));
 
        scmd->host = adapter->host;
        scmd->buffer = (void *)scb;
        scmd->cmnd[0] = MEGA_INTERNAL_CMD;
 
        scb->state |= SCB_ACTIVE;
        scb->cmd = scmd;
 
        memcpy(scb->raw_mbox, mc, sizeof(megacmd_t));
 
        /*
         * Is it a passthru command
         */
        if( mc->cmd == MEGA_MBOXCMD_PASSTHRU ) {
 
                scb->pthru = pthru;
        }
 
        scb->idx = CMDID_INT_CMDS;
 
        scmd->state = 0;
 
        /*
         * Get the lock only if the caller has not acquired it already
         */
        if( ls == LOCK_INT ) spin_lock_irqsave(adapter->host_lock, flags);
 
        megaraid_queue(scmd, mega_internal_done);
 
        if( ls == LOCK_INT ) spin_unlock_irqrestore(adapter->host_lock, flags);
 
        /*
         * Wait till this command finishes. Do not use
         * wait_event_interruptible(). It causes panic if CTRL-C is hit when
         * dumping e.g., physical disk information through /proc interface.
         * Catching the return value should solve the issue but for now keep
         * the call non-interruptible.
         */
#if 0
        wait_event_interruptible(adapter->int_waitq, scmd->state);
#endif
        wait_event(adapter->int_waitq, scmd->state);
 
        rval = scmd->result;
        mc->status = scmd->result;
 
        /*
         * Print a debug message for all failed commands. Applications can use
         * this information.
         */
        if( scmd->result && trace_level ) {
                printk("megaraid: cmd [%x, %x, %x] status:[%x]\n",
                        mc->cmd, mc->opcode, mc->subopcode, scmd->result);
        }
 
        up(&adapter->int_mtx);
 
        return rval;
}
 
 
/**
 * mega_internal_done()
 * @scmd - internal scsi command
 *
 * Callback routine for internal commands.
 */
static void
mega_internal_done(Scsi_Cmnd *scmd)
{
        adapter_t       *adapter;
 
        adapter = (adapter_t *)scmd->host->hostdata;
 
        scmd->state = 1; /* thread waiting for its command to complete */
 
        /*
         * See comment in mega_internal_command() routine for
         * wait_event_interruptible()
         */
#if 0
        wake_up_interruptible(&adapter->int_waitq);
#endif
        wake_up(&adapter->int_waitq);
 
}
 
static Scsi_Host_Template driver_template = MEGARAID;
 
#include "scsi_module.c"
 
/* vi: set ts=8 sw=8 tw=78: */
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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [scsi/] [megaraid2.c] - Blame information for rev 1774

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`*`
3			`* Linux MegaRAID device driver`
4			`*`
5			`* Copyright (c) 2002 LSI Logic Corporation.`
6			`*`
7			`* This program is free software; you can redistribute it and/or`
8			`* modify it under the terms of the GNU General Public License`
9			`* as published by the Free Software Foundation; either version`
10			`* 2 of the License, or (at your option) any later version.`
11			`*`
12			`* Copyright (c) 2002 Red Hat, Inc. All rights reserved.`
13			`* - fixes`
14			`* - speed-ups (list handling fixes, issued_list, optimizations.)`
15			`* - lots of cleanups.`
16			`*`
17			`* Version : v2.10.1 (Dec 03, 2003) - Atul Mukker <Atul.Mukker@lsil.com>`
18			`*`
19			`* Description: Linux device driver for LSI Logic MegaRAID controller`
20			`*`
21			`* Supported controllers: MegaRAID 418, 428, 438, 466, 762, 467, 471, 490, 493`
22			`* 518, 520, 531, 532`
23			`*`
24			`* This driver is supported by LSI Logic, with assistance from Red Hat, Dell,`
25			`* and others. Please send updates to the public mailing list`
26			`* linux-megaraid-devel@dell.com, and subscribe to and read archives of this`
27			`* list at http://lists.us.dell.com/.`
28			`*`
29			`* For history of changes, see ChangeLog.megaraid.`
30			`*`
31			`*/`
32
33			`#include <linux/mm.h>`
34			`#include <linux/fs.h>`
35			`#include <linux/blk.h>`
36			`#include <asm/uaccess.h>`
37			`#include <linux/delay.h>`
38			`#include <linux/reboot.h>`
39			`#include <linux/module.h>`
40			`#include <linux/list.h>`