cciss: fix error reporting for SG_IO

[linux-2.6] / drivers / block / cpqarray.c

/*
 *    Disk Array driver for Compaq SMART2 Controllers
 *    Copyright 1998 Compaq Computer Corporation
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 *    NON INFRINGEMENT.  See the GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *    Questions/Comments/Bugfixes to iss_storagedev@hp.com
 *
 */
#include <linux/module.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/bio.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/major.h>
#include <linux/fs.h>
#include <linux/blkpg.h>
#include <linux/timer.h>
#include <linux/proc_fs.h>
#include <linux/init.h>
#include <linux/hdreg.h>
#include <linux/spinlock.h>
#include <linux/blkdev.h>
#include <linux/genhd.h>
#include <asm/uaccess.h>
#include <asm/io.h>


#define SMART2_DRIVER_VERSION(maj,min,submin) ((maj<<16)|(min<<8)|(submin))

#define DRIVER_NAME "Compaq SMART2 Driver (v 2.6.0)"
#define DRIVER_VERSION SMART2_DRIVER_VERSION(2,6,0)

/* Embedded module documentation macros - see modules.h */
/* Original author Chris Frantz - Compaq Computer Corporation */
MODULE_AUTHOR("Compaq Computer Corporation");
MODULE_DESCRIPTION("Driver for Compaq Smart2 Array Controllers version 2.6.0");
MODULE_LICENSE("GPL");

#include "cpqarray.h"
#include "ida_cmd.h"
#include "smart1,2.h"
#include "ida_ioctl.h"

#define READ_AHEAD      128
#define NR_CMDS         128 /* This could probably go as high as ~400 */

#define MAX_CTLR        8
#define CTLR_SHIFT      8

#define CPQARRAY_DMA_MASK       0xFFFFFFFF      /* 32 bit DMA */

static int nr_ctlr;
static ctlr_info_t *hba[MAX_CTLR];

static int eisa[8];

#define NR_PRODUCTS ARRAY_SIZE(products)

/*  board_id = Subsystem Device ID & Vendor ID
 *  product = Marketing Name for the board
 *  access = Address of the struct of function pointers
 */
static struct board_type products[] = {
        { 0x0040110E, "IDA",                    &smart1_access },
        { 0x0140110E, "IDA-2",                  &smart1_access },
        { 0x1040110E, "IAES",                   &smart1_access },
        { 0x2040110E, "SMART",                  &smart1_access },
        { 0x3040110E, "SMART-2/E",              &smart2e_access },
        { 0x40300E11, "SMART-2/P",              &smart2_access },
        { 0x40310E11, "SMART-2SL",              &smart2_access },
        { 0x40320E11, "Smart Array 3200",       &smart2_access },
        { 0x40330E11, "Smart Array 3100ES",     &smart2_access },
        { 0x40340E11, "Smart Array 221",        &smart2_access },
        { 0x40400E11, "Integrated Array",       &smart4_access },
        { 0x40480E11, "Compaq Raid LC2",        &smart4_access },
        { 0x40500E11, "Smart Array 4200",       &smart4_access },
        { 0x40510E11, "Smart Array 4250ES",     &smart4_access },
        { 0x40580E11, "Smart Array 431",        &smart4_access },
};

/* define the PCI info for the PCI cards this driver can control */
static const struct pci_device_id cpqarray_pci_device_id[] =
{
        { PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_COMPAQ_42XX,
                0x0E11, 0x4058, 0, 0, 0},       /* SA431 */
        { PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_COMPAQ_42XX,
                0x0E11, 0x4051, 0, 0, 0},      /* SA4250ES */
        { PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_COMPAQ_42XX,
                0x0E11, 0x4050, 0, 0, 0},      /* SA4200 */
        { PCI_VENDOR_ID_NCR, PCI_DEVICE_ID_NCR_53C1510,
                0x0E11, 0x4048, 0, 0, 0},       /* LC2 */
        { PCI_VENDOR_ID_NCR, PCI_DEVICE_ID_NCR_53C1510,
                0x0E11, 0x4040, 0, 0, 0},      /* Integrated Array */
        { PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_SMART2P,
                0x0E11, 0x4034, 0, 0, 0},       /* SA 221 */
        { PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_SMART2P,
                0x0E11, 0x4033, 0, 0, 0},       /* SA 3100ES*/
        { PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_SMART2P,
                0x0E11, 0x4032, 0, 0, 0},       /* SA 3200*/
        { PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_SMART2P,
                0x0E11, 0x4031, 0, 0, 0},       /* SA 2SL*/
        { PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_SMART2P,
                0x0E11, 0x4030, 0, 0, 0},       /* SA 2P */
        { 0 }
};

MODULE_DEVICE_TABLE(pci, cpqarray_pci_device_id);

static struct gendisk *ida_gendisk[MAX_CTLR][NWD];

/* Debug... */
#define DBG(s)  do { s } while(0)
/* Debug (general info)... */
#define DBGINFO(s) do { } while(0)
/* Debug Paranoid... */
#define DBGP(s)  do { } while(0)
/* Debug Extra Paranoid... */
#define DBGPX(s) do { } while(0)

static int cpqarray_pci_init(ctlr_info_t *c, struct pci_dev *pdev);
static void __iomem *remap_pci_mem(ulong base, ulong size);
static int cpqarray_eisa_detect(void);
static int pollcomplete(int ctlr);
static void getgeometry(int ctlr);
static void start_fwbk(int ctlr);

static cmdlist_t * cmd_alloc(ctlr_info_t *h, int get_from_pool);
static void cmd_free(ctlr_info_t *h, cmdlist_t *c, int got_from_pool);

static void free_hba(int i);
static int alloc_cpqarray_hba(void);

static int sendcmd(
        __u8    cmd,
        int     ctlr,
        void    *buff,
        size_t  size,
        unsigned int blk,
        unsigned int blkcnt,
        unsigned int log_unit );

static int ida_open(struct inode *inode, struct file *filep);
static int ida_release(struct inode *inode, struct file *filep);
static int ida_ioctl(struct inode *inode, struct file *filep, unsigned int cmd, unsigned long arg);
static int ida_getgeo(struct block_device *bdev, struct hd_geometry *geo);
static int ida_ctlr_ioctl(ctlr_info_t *h, int dsk, ida_ioctl_t *io);

static void do_ida_request(struct request_queue *q);
static void start_io(ctlr_info_t *h);

static inline void addQ(cmdlist_t **Qptr, cmdlist_t *c);
static inline cmdlist_t *removeQ(cmdlist_t **Qptr, cmdlist_t *c);
static inline void complete_buffers(struct bio *bio, int ok);
static inline void complete_command(cmdlist_t *cmd, int timeout);

static irqreturn_t do_ida_intr(int irq, void *dev_id);
static void ida_timer(unsigned long tdata);
static int ida_revalidate(struct gendisk *disk);
static int revalidate_allvol(ctlr_info_t *host);
static int cpqarray_register_ctlr(int ctlr, struct pci_dev *pdev);

#ifdef CONFIG_PROC_FS
static void ida_procinit(int i);
static int ida_proc_get_info(char *buffer, char **start, off_t offset, int length, int *eof, void *data);
#else
static void ida_procinit(int i) {}
#endif

static inline drv_info_t *get_drv(struct gendisk *disk)
{
        return disk->private_data;
}

static inline ctlr_info_t *get_host(struct gendisk *disk)
{
        return disk->queue->queuedata;
}


static struct block_device_operations ida_fops  = {
        .owner          = THIS_MODULE,
        .open           = ida_open,
        .release        = ida_release,
        .ioctl          = ida_ioctl,
        .getgeo         = ida_getgeo,
        .revalidate_disk= ida_revalidate,
};


#ifdef CONFIG_PROC_FS

static struct proc_dir_entry *proc_array;

/*
 * Get us a file in /proc/array that says something about each controller.
 * Create /proc/array if it doesn't exist yet.
 */
static void __init ida_procinit(int i)
{
        if (proc_array == NULL) {
                proc_array = proc_mkdir("cpqarray", proc_root_driver);
                if (!proc_array) return;
        }

        create_proc_read_entry(hba[i]->devname, 0, proc_array,
                               ida_proc_get_info, hba[i]);
}

/*
 * Report information about this controller.
 */
static int ida_proc_get_info(char *buffer, char **start, off_t offset, int length, int *eof, void *data)
{
        off_t pos = 0;
        off_t len = 0;
        int size, i, ctlr;
        ctlr_info_t *h = (ctlr_info_t*)data;
        drv_info_t *drv;
#ifdef CPQ_PROC_PRINT_QUEUES
        cmdlist_t *c;
        unsigned long flags;
#endif

        ctlr = h->ctlr;
        size = sprintf(buffer, "%s:  Compaq %s Controller\n"
                "       Board ID: 0x%08lx\n"
                "       Firmware Revision: %c%c%c%c\n"
                "       Controller Sig: 0x%08lx\n"
                "       Memory Address: 0x%08lx\n"
                "       I/O Port: 0x%04x\n"
                "       IRQ: %d\n"
                "       Logical drives: %d\n"
                "       Physical drives: %d\n\n"
                "       Current Q depth: %d\n"
                "       Max Q depth since init: %d\n\n",
                h->devname, 
                h->product_name,
                (unsigned long)h->board_id,
                h->firm_rev[0], h->firm_rev[1], h->firm_rev[2], h->firm_rev[3],
                (unsigned long)h->ctlr_sig, (unsigned long)h->vaddr,
                (unsigned int) h->io_mem_addr, (unsigned int)h->intr,
                h->log_drives, h->phys_drives,
                h->Qdepth, h->maxQsinceinit);

        pos += size; len += size;
        
        size = sprintf(buffer+len, "Logical Drive Info:\n");
        pos += size; len += size;

        for(i=0; i<h->log_drives; i++) {
                drv = &h->drv[i];
                size = sprintf(buffer+len, "ida/c%dd%d: blksz=%d nr_blks=%d\n",
                                ctlr, i, drv->blk_size, drv->nr_blks);
                pos += size; len += size;
        }

#ifdef CPQ_PROC_PRINT_QUEUES
        spin_lock_irqsave(IDA_LOCK(h->ctlr), flags); 
        size = sprintf(buffer+len, "\nCurrent Queues:\n");
        pos += size; len += size;

        c = h->reqQ;
        size = sprintf(buffer+len, "reqQ = %p", c); pos += size; len += size;
        if (c) c=c->next;
        while(c && c != h->reqQ) {
                size = sprintf(buffer+len, "->%p", c);
                pos += size; len += size;
                c=c->next;
        }

        c = h->cmpQ;
        size = sprintf(buffer+len, "\ncmpQ = %p", c); pos += size; len += size;
        if (c) c=c->next;
        while(c && c != h->cmpQ) {
                size = sprintf(buffer+len, "->%p", c);
                pos += size; len += size;
                c=c->next;
        }

        size = sprintf(buffer+len, "\n"); pos += size; len += size;
        spin_unlock_irqrestore(IDA_LOCK(h->ctlr), flags); 
#endif
        size = sprintf(buffer+len, "nr_allocs = %d\nnr_frees = %d\n",
                        h->nr_allocs, h->nr_frees);
        pos += size; len += size;

        *eof = 1;
        *start = buffer+offset;
        len -= offset;
        if (len>length)
                len = length;
        return len;
}
#endif /* CONFIG_PROC_FS */

module_param_array(eisa, int, NULL, 0);

static void release_io_mem(ctlr_info_t *c)
{
        /* if IO mem was not protected do nothing */
        if( c->io_mem_addr == 0)
                return;
        release_region(c->io_mem_addr, c->io_mem_length);
        c->io_mem_addr = 0;
        c->io_mem_length = 0;
}

static void __devexit cpqarray_remove_one(int i)
{
        int j;
        char buff[4];

        /* sendcmd will turn off interrupt, and send the flush...
         * To write all data in the battery backed cache to disks
         * no data returned, but don't want to send NULL to sendcmd */
        if( sendcmd(FLUSH_CACHE, i, buff, 4, 0, 0, 0))
        {
                printk(KERN_WARNING "Unable to flush cache on controller %d\n",
                                i);
        }
        free_irq(hba[i]->intr, hba[i]);
        iounmap(hba[i]->vaddr);
        unregister_blkdev(COMPAQ_SMART2_MAJOR+i, hba[i]->devname);
        del_timer(&hba[i]->timer);
        remove_proc_entry(hba[i]->devname, proc_array);
        pci_free_consistent(hba[i]->pci_dev,
                        NR_CMDS * sizeof(cmdlist_t), (hba[i]->cmd_pool),
                        hba[i]->cmd_pool_dhandle);
        kfree(hba[i]->cmd_pool_bits);
        for(j = 0; j < NWD; j++) {
                if (ida_gendisk[i][j]->flags & GENHD_FL_UP)
                        del_gendisk(ida_gendisk[i][j]);
                put_disk(ida_gendisk[i][j]);
        }
        blk_cleanup_queue(hba[i]->queue);
        release_io_mem(hba[i]);
        free_hba(i);
}

static void __devexit cpqarray_remove_one_pci (struct pci_dev *pdev)
{
        int i;
        ctlr_info_t *tmp_ptr;

        if (pci_get_drvdata(pdev) == NULL) {
                printk( KERN_ERR "cpqarray: Unable to remove device \n");
                return;
        }

        tmp_ptr = pci_get_drvdata(pdev);
        i = tmp_ptr->ctlr;
        if (hba[i] == NULL) {
                printk(KERN_ERR "cpqarray: controller %d appears to have"
                        "already been removed \n", i);
                return;
        }
        pci_set_drvdata(pdev, NULL);

        cpqarray_remove_one(i);
}

/* removing an instance that was not removed automatically..
 * must be an eisa card.
 */
static void __devexit cpqarray_remove_one_eisa (int i)
{
        if (hba[i] == NULL) {
                printk(KERN_ERR "cpqarray: controller %d appears to have"
                        "already been removed \n", i);
                return;
        }
        cpqarray_remove_one(i);
}

/* pdev is NULL for eisa */
static int __init cpqarray_register_ctlr( int i, struct pci_dev *pdev)
{
        struct request_queue *q;
        int j;

        /* 
         * register block devices
         * Find disks and fill in structs
         * Get an interrupt, set the Q depth and get into /proc
         */

        /* If this successful it should insure that we are the only */
        /* instance of the driver */
        if (register_blkdev(COMPAQ_SMART2_MAJOR+i, hba[i]->devname)) {
                goto Enomem4;
        }
        hba[i]->access.set_intr_mask(hba[i], 0);
        if (request_irq(hba[i]->intr, do_ida_intr,
                IRQF_DISABLED|IRQF_SHARED, hba[i]->devname, hba[i]))
        {
                printk(KERN_ERR "cpqarray: Unable to get irq %d for %s\n",
                                hba[i]->intr, hba[i]->devname);
                goto Enomem3;
        }
                
        for (j=0; j<NWD; j++) {
                ida_gendisk[i][j] = alloc_disk(1 << NWD_SHIFT);
                if (!ida_gendisk[i][j])
                        goto Enomem2;
        }

        hba[i]->cmd_pool = pci_alloc_consistent(
                hba[i]->pci_dev, NR_CMDS * sizeof(cmdlist_t),
                &(hba[i]->cmd_pool_dhandle));
        hba[i]->cmd_pool_bits = kcalloc(
                (NR_CMDS+BITS_PER_LONG-1)/BITS_PER_LONG, sizeof(unsigned long),
                GFP_KERNEL);

        if (!hba[i]->cmd_pool_bits || !hba[i]->cmd_pool)
                        goto Enomem1;

        memset(hba[i]->cmd_pool, 0, NR_CMDS * sizeof(cmdlist_t));
        printk(KERN_INFO "cpqarray: Finding drives on %s",
                hba[i]->devname);

        spin_lock_init(&hba[i]->lock);
        q = blk_init_queue(do_ida_request, &hba[i]->lock);
        if (!q)
                goto Enomem1;

        hba[i]->queue = q;
        q->queuedata = hba[i];

        getgeometry(i);
        start_fwbk(i);

        ida_procinit(i);

        if (pdev)
                blk_queue_bounce_limit(q, hba[i]->pci_dev->dma_mask);

        /* This is a hardware imposed limit. */
        blk_queue_max_hw_segments(q, SG_MAX);

        /* This is a driver limit and could be eliminated. */
        blk_queue_max_phys_segments(q, SG_MAX);
        
        init_timer(&hba[i]->timer);
        hba[i]->timer.expires = jiffies + IDA_TIMER;
        hba[i]->timer.data = (unsigned long)hba[i];
        hba[i]->timer.function = ida_timer;
        add_timer(&hba[i]->timer);

        /* Enable IRQ now that spinlock and rate limit timer are set up */
        hba[i]->access.set_intr_mask(hba[i], FIFO_NOT_EMPTY);

        for(j=0; j<NWD; j++) {
                struct gendisk *disk = ida_gendisk[i][j];
                drv_info_t *drv = &hba[i]->drv[j];
                sprintf(disk->disk_name, "ida/c%dd%d", i, j);
                disk->major = COMPAQ_SMART2_MAJOR + i;
                disk->first_minor = j<<NWD_SHIFT;
                disk->fops = &ida_fops;
                if (j && !drv->nr_blks)
                        continue;
                blk_queue_hardsect_size(hba[i]->queue, drv->blk_size);
                set_capacity(disk, drv->nr_blks);
                disk->queue = hba[i]->queue;
                disk->private_data = drv;
                add_disk(disk);
        }

        /* done ! */
        return(i);

Enomem1:
        nr_ctlr = i; 
        kfree(hba[i]->cmd_pool_bits);
        if (hba[i]->cmd_pool)
                pci_free_consistent(hba[i]->pci_dev, NR_CMDS*sizeof(cmdlist_t), 
                                    hba[i]->cmd_pool, hba[i]->cmd_pool_dhandle);
Enomem2:
        while (j--) {
                put_disk(ida_gendisk[i][j]);
                ida_gendisk[i][j] = NULL;
        }
        free_irq(hba[i]->intr, hba[i]);
Enomem3:
        unregister_blkdev(COMPAQ_SMART2_MAJOR+i, hba[i]->devname);
Enomem4:
        if (pdev)
                pci_set_drvdata(pdev, NULL);
        release_io_mem(hba[i]);
        free_hba(i);

        printk( KERN_ERR "cpqarray: out of memory");

        return -1;
}

static int __init cpqarray_init_one( struct pci_dev *pdev,
        const struct pci_device_id *ent)
{
        int i;

        printk(KERN_DEBUG "cpqarray: Device 0x%x has been found at"
                        " bus %d dev %d func %d\n",
                        pdev->device, pdev->bus->number, PCI_SLOT(pdev->devfn),
                        PCI_FUNC(pdev->devfn));
        i = alloc_cpqarray_hba();
        if( i < 0 )
                return (-1);
        memset(hba[i], 0, sizeof(ctlr_info_t));
        sprintf(hba[i]->devname, "ida%d", i);
        hba[i]->ctlr = i;
        /* Initialize the pdev driver private data */
        pci_set_drvdata(pdev, hba[i]);

        if (cpqarray_pci_init(hba[i], pdev) != 0) {
                pci_set_drvdata(pdev, NULL);
                release_io_mem(hba[i]);
                free_hba(i);
                return -1;
        }

        return (cpqarray_register_ctlr(i, pdev));
}

static struct pci_driver cpqarray_pci_driver = {
        .name = "cpqarray",
        .probe = cpqarray_init_one,
        .remove = __devexit_p(cpqarray_remove_one_pci),
        .id_table = cpqarray_pci_device_id,
};

/*
 *  This is it.  Find all the controllers and register them.
 *  returns the number of block devices registered.
 */
static int __init cpqarray_init(void)
{
        int num_cntlrs_reg = 0;
        int i;
        int rc = 0;

        /* detect controllers */
        printk(DRIVER_NAME "\n");

        rc = pci_register_driver(&cpqarray_pci_driver);
        if (rc)
                return rc;
        cpqarray_eisa_detect();
        
        for (i=0; i < MAX_CTLR; i++) {
                if (hba[i] != NULL)
                        num_cntlrs_reg++;
        }

        return(num_cntlrs_reg);
}

/* Function to find the first free pointer into our hba[] array */
/* Returns -1 if no free entries are left.  */
static int alloc_cpqarray_hba(void)
{
        int i;

        for(i=0; i< MAX_CTLR; i++) {
                if (hba[i] == NULL) {
                        hba[i] = kmalloc(sizeof(ctlr_info_t), GFP_KERNEL);
                        if(hba[i]==NULL) {
                                printk(KERN_ERR "cpqarray: out of memory.\n");
                                return (-1);
                        }
                        return (i);
                }
        }
        printk(KERN_WARNING "cpqarray: This driver supports a maximum"
                " of 8 controllers.\n");
        return(-1);
}

static void free_hba(int i)
{
        kfree(hba[i]);
        hba[i]=NULL;
}

/*
 * Find the IO address of the controller, its IRQ and so forth.  Fill
 * in some basic stuff into the ctlr_info_t structure.
 */
static int cpqarray_pci_init(ctlr_info_t *c, struct pci_dev *pdev)
{
        ushort vendor_id, device_id, command;
        unchar cache_line_size, latency_timer;
        unchar irq, revision;
        unsigned long addr[6];
        __u32 board_id;

        int i;

        c->pci_dev = pdev;
        if (pci_enable_device(pdev)) {
                printk(KERN_ERR "cpqarray: Unable to Enable PCI device\n");
                return -1;
        }
        vendor_id = pdev->vendor;
        device_id = pdev->device;
        irq = pdev->irq;

        for(i=0; i<6; i++)
                addr[i] = pci_resource_start(pdev, i);

        if (pci_set_dma_mask(pdev, CPQARRAY_DMA_MASK) != 0)
        {
                printk(KERN_ERR "cpqarray: Unable to set DMA mask\n");
                return -1;
        }

        pci_read_config_word(pdev, PCI_COMMAND, &command);
        pci_read_config_byte(pdev, PCI_CLASS_REVISION, &revision);
        pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &cache_line_size);
        pci_read_config_byte(pdev, PCI_LATENCY_TIMER, &latency_timer);

        pci_read_config_dword(pdev, 0x2c, &board_id);

        /* check to see if controller has been disabled */
        if(!(command & 0x02)) {
                printk(KERN_WARNING
                        "cpqarray: controller appears to be disabled\n");
                return(-1);
        }

DBGINFO(
        printk("vendor_id = %x\n", vendor_id);
        printk("device_id = %x\n", device_id);
        printk("command = %x\n", command);
        for(i=0; i<6; i++)
                printk("addr[%d] = %lx\n", i, addr[i]);
        printk("revision = %x\n", revision);
        printk("irq = %x\n", irq);
        printk("cache_line_size = %x\n", cache_line_size);
        printk("latency_timer = %x\n", latency_timer);
        printk("board_id = %x\n", board_id);
);

        c->intr = irq;

        for(i=0; i<6; i++) {
                if (pci_resource_flags(pdev, i) & PCI_BASE_ADDRESS_SPACE_IO)
                { /* IO space */
                        c->io_mem_addr = addr[i];
                        c->io_mem_length = pci_resource_end(pdev, i)
                                - pci_resource_start(pdev, i) + 1;
                        if(!request_region( c->io_mem_addr, c->io_mem_length,
                                "cpqarray"))
                        {
                                printk( KERN_WARNING "cpqarray I/O memory range already in use addr %lx length = %ld\n", c->io_mem_addr, c->io_mem_length);
                                c->io_mem_addr = 0;
                                c->io_mem_length = 0;
                        }
                        break;
                }
        }

        c->paddr = 0;
        for(i=0; i<6; i++)
                if (!(pci_resource_flags(pdev, i) &
                                PCI_BASE_ADDRESS_SPACE_IO)) {
                        c->paddr = pci_resource_start (pdev, i);
                        break;
                }
        if (!c->paddr)
                return -1;
        c->vaddr = remap_pci_mem(c->paddr, 128);
        if (!c->vaddr)
                return -1;
        c->board_id = board_id;

        for(i=0; i<NR_PRODUCTS; i++) {
                if (board_id == products[i].board_id) {
                        c->product_name = products[i].product_name;
                        c->access = *(products[i].access);
                        break;
                }
        }
        if (i == NR_PRODUCTS) {
                printk(KERN_WARNING "cpqarray: Sorry, I don't know how"
                        " to access the SMART Array controller %08lx\n", 
                                (unsigned long)board_id);
                return -1;
        }

        return 0;
}

/*
 * Map (physical) PCI mem into (virtual) kernel space
 */
static void __iomem *remap_pci_mem(ulong base, ulong size)
{
        ulong page_base        = ((ulong) base) & PAGE_MASK;
        ulong page_offs        = ((ulong) base) - page_base;
        void __iomem *page_remapped    = ioremap(page_base, page_offs+size);

        return (page_remapped ? (page_remapped + page_offs) : NULL);
}

#ifndef MODULE
/*
 * Config string is a comma separated set of i/o addresses of EISA cards.
 */
static int cpqarray_setup(char *str)
{
        int i, ints[9];

        (void)get_options(str, ARRAY_SIZE(ints), ints);

        for(i=0; i<ints[0] && i<8; i++)
                eisa[i] = ints[i+1];
        return 1;
}

__setup("smart2=", cpqarray_setup);

#endif

/*
 * Find an EISA controller's signature.  Set up an hba if we find it.
 */
static int __init cpqarray_eisa_detect(void)
{
        int i=0, j;
        __u32 board_id;
        int intr;
        int ctlr;
        int num_ctlr = 0;

        while(i<8 && eisa[i]) {
                ctlr = alloc_cpqarray_hba();
                if(ctlr == -1)
                        break;
                board_id = inl(eisa[i]+0xC80);
                for(j=0; j < NR_PRODUCTS; j++)
                        if (board_id == products[j].board_id) 
                                break;

                if (j == NR_PRODUCTS) {
                        printk(KERN_WARNING "cpqarray: Sorry, I don't know how"
                                " to access the SMART Array controller %08lx\n",                                 (unsigned long)board_id);
                        continue;
                }

                memset(hba[ctlr], 0, sizeof(ctlr_info_t));
                hba[ctlr]->io_mem_addr = eisa[i];
                hba[ctlr]->io_mem_length = 0x7FF;
                if(!request_region(hba[ctlr]->io_mem_addr,
                                hba[ctlr]->io_mem_length,
                                "cpqarray"))
                {
                        printk(KERN_WARNING "cpqarray: I/O range already in "
                                        "use addr = %lx length = %ld\n",
                                        hba[ctlr]->io_mem_addr,
                                        hba[ctlr]->io_mem_length);
                        free_hba(ctlr);
                        continue;
                }

                /*
                 * Read the config register to find our interrupt
                 */
                intr = inb(eisa[i]+0xCC0) >> 4;
                if (intr & 1) intr = 11;
                else if (intr & 2) intr = 10;
                else if (intr & 4) intr = 14;
                else if (intr & 8) intr = 15;
                
                hba[ctlr]->intr = intr;
                sprintf(hba[ctlr]->devname, "ida%d", nr_ctlr);
                hba[ctlr]->product_name = products[j].product_name;
                hba[ctlr]->access = *(products[j].access);
                hba[ctlr]->ctlr = ctlr;
                hba[ctlr]->board_id = board_id;
                hba[ctlr]->pci_dev = NULL; /* not PCI */

DBGINFO(
        printk("i = %d, j = %d\n", i, j);
        printk("irq = %x\n", intr);
        printk("product name = %s\n", products[j].product_name);
        printk("board_id = %x\n", board_id);
);

                num_ctlr++;
                i++;

                if (cpqarray_register_ctlr(ctlr, NULL) == -1)
                        printk(KERN_WARNING
                                "cpqarray: Can't register EISA controller %d\n",
                                ctlr);

        }

        return num_ctlr;
}

/*
 * Open.  Make sure the device is really there.
 */
static int ida_open(struct inode *inode, struct file *filep)
{
        drv_info_t *drv = get_drv(inode->i_bdev->bd_disk);
        ctlr_info_t *host = get_host(inode->i_bdev->bd_disk);

        DBGINFO(printk("ida_open %s\n", inode->i_bdev->bd_disk->disk_name));
        /*
         * Root is allowed to open raw volume zero even if it's not configured
         * so array config can still work.  I don't think I really like this,
         * but I'm already using way to many device nodes to claim another one
         * for "raw controller".
         */
        if (!drv->nr_blks) {
                if (!capable(CAP_SYS_RAWIO))
                        return -ENXIO;
                if (!capable(CAP_SYS_ADMIN) && drv != host->drv)
                        return -ENXIO;
        }
        host->usage_count++;
        return 0;
}

/*
 * Close.  Sync first.
 */
static int ida_release(struct inode *inode, struct file *filep)
{
        ctlr_info_t *host = get_host(inode->i_bdev->bd_disk);
        host->usage_count--;
        return 0;
}

/*
 * Enqueuing and dequeuing functions for cmdlists.
 */
static inline void addQ(cmdlist_t **Qptr, cmdlist_t *c)
{
        if (*Qptr == NULL) {
                *Qptr = c;
                c->next = c->prev = c;
        } else {
                c->prev = (*Qptr)->prev;
                c->next = (*Qptr);
                (*Qptr)->prev->next = c;
                (*Qptr)->prev = c;
        }
}

static inline cmdlist_t *removeQ(cmdlist_t **Qptr, cmdlist_t *c)
{
        if (c && c->next != c) {
                if (*Qptr == c) *Qptr = c->next;
                c->prev->next = c->next;
                c->next->prev = c->prev;
        } else {
                *Qptr = NULL;
        }
        return c;
}

/*
 * Get a request and submit it to the controller.
 * This routine needs to grab all the requests it possibly can from the
 * req Q and submit them.  Interrupts are off (and need to be off) when you
 * are in here (either via the dummy do_ida_request functions or by being
 * called from the interrupt handler
 */
static void do_ida_request(struct request_queue *q)
{
        ctlr_info_t *h = q->queuedata;
        cmdlist_t *c;
        struct request *creq;
        struct scatterlist tmp_sg[SG_MAX];
        int i, dir, seg;

        if (blk_queue_plugged(q))
                goto startio;

queue_next:
        creq = elv_next_request(q);
        if (!creq)
                goto startio;

        BUG_ON(creq->nr_phys_segments > SG_MAX);

        if ((c = cmd_alloc(h,1)) == NULL)
                goto startio;

        blkdev_dequeue_request(creq);

        c->ctlr = h->ctlr;
        c->hdr.unit = (drv_info_t *)(creq->rq_disk->private_data) - h->drv;
        c->hdr.size = sizeof(rblk_t) >> 2;
        c->size += sizeof(rblk_t);

        c->req.hdr.blk = creq->sector;
        c->rq = creq;
DBGPX(
        printk("sector=%d, nr_sectors=%d\n", creq->sector, creq->nr_sectors);
);
        seg = blk_rq_map_sg(q, creq, tmp_sg);

        /* Now do all the DMA Mappings */
        if (rq_data_dir(creq) == READ)
                dir = PCI_DMA_FROMDEVICE;
        else
                dir = PCI_DMA_TODEVICE;
        for( i=0; i < seg; i++)
        {
                c->req.sg[i].size = tmp_sg[i].length;
                c->req.sg[i].addr = (__u32) pci_map_page(h->pci_dev,
                                                 tmp_sg[i].page,
                                                 tmp_sg[i].offset,
                                                 tmp_sg[i].length, dir);
        }
DBGPX(  printk("Submitting %d sectors in %d segments\n", creq->nr_sectors, seg); );
        c->req.hdr.sg_cnt = seg;
        c->req.hdr.blk_cnt = creq->nr_sectors;
        c->req.hdr.cmd = (rq_data_dir(creq) == READ) ? IDA_READ : IDA_WRITE;
        c->type = CMD_RWREQ;

        /* Put the request on the tail of the request queue */
        addQ(&h->reqQ, c);
        h->Qdepth++;
        if (h->Qdepth > h->maxQsinceinit) 
                h->maxQsinceinit = h->Qdepth;

        goto queue_next;

startio:
        start_io(h);
}

/* 
 * start_io submits everything on a controller's request queue
 * and moves it to the completion queue.
 *
 * Interrupts had better be off if you're in here
 */
static void start_io(ctlr_info_t *h)
{
        cmdlist_t *c;

        while((c = h->reqQ) != NULL) {
                /* Can't do anything if we're busy */
                if (h->access.fifo_full(h) == 0)
                        return;

                /* Get the first entry from the request Q */
                removeQ(&h->reqQ, c);
                h->Qdepth--;
        
                /* Tell the controller to do our bidding */
                h->access.submit_command(h, c);

                /* Get onto the completion Q */
                addQ(&h->cmpQ, c);
        }
}

static inline void complete_buffers(struct bio *bio, int ok)
{
        struct bio *xbh;

        while (bio) {
                xbh = bio->bi_next;
                bio->bi_next = NULL;
                
                bio_endio(bio, ok ? 0 : -EIO);

                bio = xbh;
        }
}
/*
 * Mark all buffers that cmd was responsible for
 */
static inline void complete_command(cmdlist_t *cmd, int timeout)
{
        struct request *rq = cmd->rq;
        int ok=1;
        int i, ddir;

        if (cmd->req.hdr.rcode & RCODE_NONFATAL &&
           (hba[cmd->ctlr]->misc_tflags & MISC_NONFATAL_WARN) == 0) {
                printk(KERN_NOTICE "Non Fatal error on ida/c%dd%d\n",
                                cmd->ctlr, cmd->hdr.unit);
                hba[cmd->ctlr]->misc_tflags |= MISC_NONFATAL_WARN;
        }
        if (cmd->req.hdr.rcode & RCODE_FATAL) {
                printk(KERN_WARNING "Fatal error on ida/c%dd%d\n",
                                cmd->ctlr, cmd->hdr.unit);
                ok = 0;
        }
        if (cmd->req.hdr.rcode & RCODE_INVREQ) {
                                printk(KERN_WARNING "Invalid request on ida/c%dd%d = (cmd=%x sect=%d cnt=%d sg=%d ret=%x)\n",
                                cmd->ctlr, cmd->hdr.unit, cmd->req.hdr.cmd,
                                cmd->req.hdr.blk, cmd->req.hdr.blk_cnt,
                                cmd->req.hdr.sg_cnt, cmd->req.hdr.rcode);
                ok = 0; 
        }
        if (timeout) ok = 0;
        /* unmap the DMA mapping for all the scatter gather elements */
        if (cmd->req.hdr.cmd == IDA_READ)
                ddir = PCI_DMA_FROMDEVICE;
        else
                ddir = PCI_DMA_TODEVICE;
        for(i=0; i<cmd->req.hdr.sg_cnt; i++)
                pci_unmap_page(hba[cmd->ctlr]->pci_dev, cmd->req.sg[i].addr,
                                cmd->req.sg[i].size, ddir);

        complete_buffers(rq->bio, ok);

        if (blk_fs_request(rq)) {
                const int rw = rq_data_dir(rq);

                disk_stat_add(rq->rq_disk, sectors[rw], rq->nr_sectors);
        }

        add_disk_randomness(rq->rq_disk);

        DBGPX(printk("Done with %p\n", rq););
        end_that_request_last(rq, ok ? 1 : -EIO);
}

/*
 *  The controller will interrupt us upon completion of commands.
 *  Find the command on the completion queue, remove it, tell the OS and
 *  try to queue up more IO
 */
static irqreturn_t do_ida_intr(int irq, void *dev_id)
{
        ctlr_info_t *h = dev_id;
        cmdlist_t *c;
        unsigned long istat;
        unsigned long flags;
        __u32 a,a1;

        istat = h->access.intr_pending(h);
        /* Is this interrupt for us? */
        if (istat == 0)
                return IRQ_NONE;

        /*
         * If there are completed commands in the completion queue,
         * we had better do something about it.
         */
        spin_lock_irqsave(IDA_LOCK(h->ctlr), flags);
        if (istat & FIFO_NOT_EMPTY) {
                while((a = h->access.command_completed(h))) {
                        a1 = a; a &= ~3;
                        if ((c = h->cmpQ) == NULL)
                        {  
                                printk(KERN_WARNING "cpqarray: Completion of %08lx ignored\n", (unsigned long)a1);
                                continue;       
                        } 
                        while(c->busaddr != a) {
                                c = c->next;
                                if (c == h->cmpQ) 
                                        break;
                        }
                        /*
                         * If we've found the command, take it off the
                         * completion Q and free it
                         */
                        if (c->busaddr == a) {
                                removeQ(&h->cmpQ, c);
                                /*  Check for invalid command.
                                 *  Controller returns command error,
                                 *  But rcode = 0.
                                 */

                                if((a1 & 0x03) && (c->req.hdr.rcode == 0))
                                {
                                        c->req.hdr.rcode = RCODE_INVREQ;
                                }
                                if (c->type == CMD_RWREQ) {
                                        complete_command(c, 0);
                                        cmd_free(h, c, 1);
                                } else if (c->type == CMD_IOCTL_PEND) {
                                        c->type = CMD_IOCTL_DONE;
                                }
                                continue;
                        }
                }
        }

        /*
         * See if we can queue up some more IO
         */
        do_ida_request(h->queue);
        spin_unlock_irqrestore(IDA_LOCK(h->ctlr), flags); 
        return IRQ_HANDLED;
}

/*
 * This timer was for timing out requests that haven't happened after
 * IDA_TIMEOUT.  That wasn't such a good idea.  This timer is used to
 * reset a flags structure so we don't flood the user with
 * "Non-Fatal error" messages.
 */
static void ida_timer(unsigned long tdata)
{
        ctlr_info_t *h = (ctlr_info_t*)tdata;

        h->timer.expires = jiffies + IDA_TIMER;
        add_timer(&h->timer);
        h->misc_tflags = 0;
}

static int ida_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
        drv_info_t *drv = get_drv(bdev->bd_disk);

        if (drv->cylinders) {
                geo->heads = drv->heads;
                geo->sectors = drv->sectors;
                geo->cylinders = drv->cylinders;
        } else {
                geo->heads = 0xff;
                geo->sectors = 0x3f;
                geo->cylinders = drv->nr_blks / (0xff*0x3f);
        }

        return 0;
}

/*
 *  ida_ioctl does some miscellaneous stuff like reporting drive geometry,
 *  setting readahead and submitting commands from userspace to the controller.
 */
static int ida_ioctl(struct inode *inode, struct file *filep, unsigned int cmd, unsigned long arg)
{
        drv_info_t *drv = get_drv(inode->i_bdev->bd_disk);
        ctlr_info_t *host = get_host(inode->i_bdev->bd_disk);
        int error;
        ida_ioctl_t __user *io = (ida_ioctl_t __user *)arg;
        ida_ioctl_t *my_io;

        switch(cmd) {
        case IDAGETDRVINFO:
                if (copy_to_user(&io->c.drv, drv, sizeof(drv_info_t)))
                        return -EFAULT;
                return 0;
        case IDAPASSTHRU:
                if (!capable(CAP_SYS_RAWIO))
                        return -EPERM;
                my_io = kmalloc(sizeof(ida_ioctl_t), GFP_KERNEL);
                if (!my_io)
                        return -ENOMEM;
                error = -EFAULT;
                if (copy_from_user(my_io, io, sizeof(*my_io)))
                        goto out_passthru;
                error = ida_ctlr_ioctl(host, drv - host->drv, my_io);
                if (error)
                        goto out_passthru;
                error = -EFAULT;
                if (copy_to_user(io, my_io, sizeof(*my_io)))
                        goto out_passthru;
                error = 0;
out_passthru:
                kfree(my_io);
                return error;
        case IDAGETCTLRSIG:
                if (!arg) return -EINVAL;
                put_user(host->ctlr_sig, (int __user *)arg);
                return 0;
        case IDAREVALIDATEVOLS:
                if (iminor(inode) != 0)
                        return -ENXIO;
                return revalidate_allvol(host);
        case IDADRIVERVERSION:
                if (!arg) return -EINVAL;
                put_user(DRIVER_VERSION, (unsigned long __user *)arg);
                return 0;
        case IDAGETPCIINFO:
        {
                
                ida_pci_info_struct pciinfo;

                if (!arg) return -EINVAL;
                pciinfo.bus = host->pci_dev->bus->number;
                pciinfo.dev_fn = host->pci_dev->devfn;
                pciinfo.board_id = host->board_id;
                if(copy_to_user((void __user *) arg, &pciinfo,  
                        sizeof( ida_pci_info_struct)))
                                return -EFAULT;
                return(0);
        }       

        default:
                return -EINVAL;
        }
                
}
/*
 * ida_ctlr_ioctl is for passing commands to the controller from userspace.
 * The command block (io) has already been copied to kernel space for us,
 * however, any elements in the sglist need to be copied to kernel space
 * or copied back to userspace.
 *
 * Only root may perform a controller passthru command, however I'm not doing
 * any serious sanity checking on the arguments.  Doing an IDA_WRITE_MEDIA and
 * putting a 64M buffer in the sglist is probably a *bad* idea.
 */
static int ida_ctlr_ioctl(ctlr_info_t *h, int dsk, ida_ioctl_t *io)
{
        int ctlr = h->ctlr;
        cmdlist_t *c;
        void *p = NULL;
        unsigned long flags;
        int error;

        if ((c = cmd_alloc(h, 0)) == NULL)
                return -ENOMEM;
        c->ctlr = ctlr;
        c->hdr.unit = (io->unit & UNITVALID) ? (io->unit & ~UNITVALID) : dsk;
        c->hdr.size = sizeof(rblk_t) >> 2;
        c->size += sizeof(rblk_t);

        c->req.hdr.cmd = io->cmd;
        c->req.hdr.blk = io->blk;
        c->req.hdr.blk_cnt = io->blk_cnt;
        c->type = CMD_IOCTL_PEND;

        /* Pre submit processing */
        switch(io->cmd) {
        case PASSTHRU_A:
                p = kmalloc(io->sg[0].size, GFP_KERNEL);
                if (!p) 
                { 
                        error = -ENOMEM; 
                        cmd_free(h, c, 0); 
                        return(error);
                }
                if (copy_from_user(p, io->sg[0].addr, io->sg[0].size)) {
                        kfree(p);
                        cmd_free(h, c, 0); 
                        return -EFAULT;
                }
                c->req.hdr.blk = pci_map_single(h->pci_dev, &(io->c), 
                                sizeof(ida_ioctl_t), 
                                PCI_DMA_BIDIRECTIONAL);
                c->req.sg[0].size = io->sg[0].size;
                c->req.sg[0].addr = pci_map_single(h->pci_dev, p, 
                        c->req.sg[0].size, PCI_DMA_BIDIRECTIONAL);
                c->req.hdr.sg_cnt = 1;
                break;
        case IDA_READ:
        case READ_FLASH_ROM:
        case SENSE_CONTROLLER_PERFORMANCE:
                p = kmalloc(io->sg[0].size, GFP_KERNEL);
                if (!p) 
                { 
                        error = -ENOMEM; 
                        cmd_free(h, c, 0);
                        return(error);
                }

                c->req.sg[0].size = io->sg[0].size;
                c->req.sg[0].addr = pci_map_single(h->pci_dev, p, 
                        c->req.sg[0].size, PCI_DMA_BIDIRECTIONAL); 
                c->req.hdr.sg_cnt = 1;
                break;
        case IDA_WRITE:
        case IDA_WRITE_MEDIA:
        case DIAG_PASS_THRU:
        case COLLECT_BUFFER:
        case WRITE_FLASH_ROM:
                p = kmalloc(io->sg[0].size, GFP_KERNEL);
                if (!p) 
                { 
                        error = -ENOMEM; 
                        cmd_free(h, c, 0);
                        return(error);
                }
                if (copy_from_user(p, io->sg[0].addr, io->sg[0].size)) {
                        kfree(p);
                        cmd_free(h, c, 0);
                        return -EFAULT;
                }
                c->req.sg[0].size = io->sg[0].size;
                c->req.sg[0].addr = pci_map_single(h->pci_dev, p, 
                        c->req.sg[0].size, PCI_DMA_BIDIRECTIONAL); 
                c->req.hdr.sg_cnt = 1;
                break;
        default:
                c->req.sg[0].size = sizeof(io->c);
                c->req.sg[0].addr = pci_map_single(h->pci_dev,&io->c, 
                        c->req.sg[0].size, PCI_DMA_BIDIRECTIONAL);
                c->req.hdr.sg_cnt = 1;
        }
        
        /* Put the request on the tail of the request queue */
        spin_lock_irqsave(IDA_LOCK(ctlr), flags);
        addQ(&h->reqQ, c);
        h->Qdepth++;
        start_io(h);
        spin_unlock_irqrestore(IDA_LOCK(ctlr), flags);

        /* Wait for completion */
        while(c->type != CMD_IOCTL_DONE)
                schedule();

        /* Unmap the DMA  */
        pci_unmap_single(h->pci_dev, c->req.sg[0].addr, c->req.sg[0].size, 
                PCI_DMA_BIDIRECTIONAL);
        /* Post submit processing */
        switch(io->cmd) {
        case PASSTHRU_A:
                pci_unmap_single(h->pci_dev, c->req.hdr.blk,
                                sizeof(ida_ioctl_t),
                                PCI_DMA_BIDIRECTIONAL);
        case IDA_READ:
        case DIAG_PASS_THRU:
        case SENSE_CONTROLLER_PERFORMANCE:
        case READ_FLASH_ROM:
                if (copy_to_user(io->sg[0].addr, p, io->sg[0].size)) {
                        kfree(p);
                        return -EFAULT;
                }
                /* fall through and free p */
        case IDA_WRITE:
        case IDA_WRITE_MEDIA:
        case COLLECT_BUFFER:
        case WRITE_FLASH_ROM:
                kfree(p);
                break;
        default:;
                /* Nothing to do */
        }

        io->rcode = c->req.hdr.rcode;
        cmd_free(h, c, 0);
        return(0);
}

/*
 * Commands are pre-allocated in a large block.  Here we use a simple bitmap
 * scheme to suballocte them to the driver.  Operations that are not time
 * critical (and can wait for kmalloc and possibly sleep) can pass in NULL
 * as the first argument to get a new command.
 */
static cmdlist_t * cmd_alloc(ctlr_info_t *h, int get_from_pool)
{
        cmdlist_t * c;
        int i;
        dma_addr_t cmd_dhandle;

        if (!get_from_pool) {
                c = (cmdlist_t*)pci_alloc_consistent(h->pci_dev, 
                        sizeof(cmdlist_t), &cmd_dhandle);
                if(c==NULL)
                        return NULL;
        } else {
                do {
                        i = find_first_zero_bit(h->cmd_pool_bits, NR_CMDS);
                        if (i == NR_CMDS)
                                return NULL;
                } while(test_and_set_bit(i&(BITS_PER_LONG-1), h->cmd_pool_bits+(i/BITS_PER_LONG)) != 0);
                c = h->cmd_pool + i;
                cmd_dhandle = h->cmd_pool_dhandle + i*sizeof(cmdlist_t);
                h->nr_allocs++;
        }

        memset(c, 0, sizeof(cmdlist_t));
        c->busaddr = cmd_dhandle; 
        return c;
}

static void cmd_free(ctlr_info_t *h, cmdlist_t *c, int got_from_pool)
{
        int i;

        if (!got_from_pool) {
                pci_free_consistent(h->pci_dev, sizeof(cmdlist_t), c,
                        c->busaddr);
        } else {
                i = c - h->cmd_pool;
                clear_bit(i&(BITS_PER_LONG-1), h->cmd_pool_bits+(i/BITS_PER_LONG));
                h->nr_frees++;
        }
}

/***********************************************************************
    name:        sendcmd
    Send a command to an IDA using the memory mapped FIFO interface
    and wait for it to complete.  
    This routine should only be called at init time.
***********************************************************************/
static int sendcmd(
        __u8    cmd,
        int     ctlr,
        void    *buff,
        size_t  size,
        unsigned int blk,
        unsigned int blkcnt,
        unsigned int log_unit )
{
        cmdlist_t *c;
        int complete;
        unsigned long temp;
        unsigned long i;
        ctlr_info_t *info_p = hba[ctlr];

        c = cmd_alloc(info_p, 1);
        if(!c)
                return IO_ERROR;
        c->ctlr = ctlr;
        c->hdr.unit = log_unit;
        c->hdr.prio = 0;
        c->hdr.size = sizeof(rblk_t) >> 2;
        c->size += sizeof(rblk_t);

        /* The request information. */
        c->req.hdr.next = 0;
        c->req.hdr.rcode = 0;
        c->req.bp = 0;
        c->req.hdr.sg_cnt = 1;
        c->req.hdr.reserved = 0;
        
        if (size == 0)
                c->req.sg[0].size = 512;
        else
                c->req.sg[0].size = size;

        c->req.hdr.blk = blk;
        c->req.hdr.blk_cnt = blkcnt;
        c->req.hdr.cmd = (unsigned char) cmd;
        c->req.sg[0].addr = (__u32) pci_map_single(info_p->pci_dev, 
                buff, c->req.sg[0].size, PCI_DMA_BIDIRECTIONAL);
        /*
         * Disable interrupt
         */
        info_p->access.set_intr_mask(info_p, 0);
        /* Make sure there is room in the command FIFO */
        /* Actually it should be completely empty at this time. */
        for (i = 200000; i > 0; i--) {
                temp = info_p->access.fifo_full(info_p);
                if (temp != 0) {
                        break;
                }
                udelay(10);
DBG(
                printk(KERN_WARNING "cpqarray ida%d: idaSendPciCmd FIFO full,"
                        " waiting!\n", ctlr);
);
        } 
        /*
         * Send the cmd
         */
        info_p->access.submit_command(info_p, c);
        complete = pollcomplete(ctlr);
        
        pci_unmap_single(info_p->pci_dev, (dma_addr_t) c->req.sg[0].addr, 
                c->req.sg[0].size, PCI_DMA_BIDIRECTIONAL);
        if (complete != 1) {
                if (complete != c->busaddr) {
                        printk( KERN_WARNING
                        "cpqarray ida%d: idaSendPciCmd "
                      "Invalid command list address returned! (%08lx)\n",
                                ctlr, (unsigned long)complete);
                        cmd_free(info_p, c, 1);
                        return (IO_ERROR);
                }
        } else {
                printk( KERN_WARNING
                        "cpqarray ida%d: idaSendPciCmd Timeout out, "
                        "No command list address returned!\n",
                        ctlr);
                cmd_free(info_p, c, 1);
                return (IO_ERROR);
        }

        if (c->req.hdr.rcode & 0x00FE) {
                if (!(c->req.hdr.rcode & BIG_PROBLEM)) {
                        printk( KERN_WARNING
                        "cpqarray ida%d: idaSendPciCmd, error: "
                                "Controller failed at init time "
                                "cmd: 0x%x, return code = 0x%x\n",
                                ctlr, c->req.hdr.cmd, c->req.hdr.rcode);

                        cmd_free(info_p, c, 1);
                        return (IO_ERROR);
                }
        }
        cmd_free(info_p, c, 1);
        return (IO_OK);
}

/*
 * revalidate_allvol is for online array config utilities.  After a
 * utility reconfigures the drives in the array, it can use this function
 * (through an ioctl) to make the driver zap any previous disk structs for
 * that controller and get new ones.
 *
 * Right now I'm using the getgeometry() function to do this, but this
 * function should probably be finer grained and allow you to revalidate one
 * particualar logical volume (instead of all of them on a particular
 * controller).
 */
static int revalidate_allvol(ctlr_info_t *host)
{
        int ctlr = host->ctlr;
        int i;
        unsigned long flags;

        spin_lock_irqsave(IDA_LOCK(ctlr), flags);
        if (host->usage_count > 1) {
                spin_unlock_irqrestore(IDA_LOCK(ctlr), flags);
                printk(KERN_WARNING "cpqarray: Device busy for volume"
                        " revalidation (usage=%d)\n", host->usage_count);
                return -EBUSY;
        }
        host->usage_count++;
        spin_unlock_irqrestore(IDA_LOCK(ctlr), flags);

        /*
         * Set the partition and block size structures for all volumes
         * on this controller to zero.  We will reread all of this data
         */
        set_capacity(ida_gendisk[ctlr][0], 0);
        for (i = 1; i < NWD; i++) {
                struct gendisk *disk = ida_gendisk[ctlr][i];
                if (disk->flags & GENHD_FL_UP)
                        del_gendisk(disk);
        }
        memset(host->drv, 0, sizeof(drv_info_t)*NWD);

        /*
         * Tell the array controller not to give us any interrupts while
         * we check the new geometry.  Then turn interrupts back on when
         * we're done.
         */
        host->access.set_intr_mask(host, 0);
        getgeometry(ctlr);
        host->access.set_intr_mask(host, FIFO_NOT_EMPTY);

        for(i=0; i<NWD; i++) {
                struct gendisk *disk = ida_gendisk[ctlr][i];
                drv_info_t *drv = &host->drv[i];
                if (i && !drv->nr_blks)
                        continue;
                blk_queue_hardsect_size(host->queue, drv->blk_size);
                set_capacity(disk, drv->nr_blks);
                disk->queue = host->queue;
                disk->private_data = drv;
                if (i)
                        add_disk(disk);
        }

        host->usage_count--;
        return 0;
}

static int ida_revalidate(struct gendisk *disk)
{
        drv_info_t *drv = disk->private_data;
        set_capacity(disk, drv->nr_blks);
        return 0;
}

/********************************************************************
    name: pollcomplete
    Wait polling for a command to complete.
    The memory mapped FIFO is polled for the completion.
    Used only at init time, interrupts disabled.
 ********************************************************************/
static int pollcomplete(int ctlr)
{
        int done;
        int i;

        /* Wait (up to 2 seconds) for a command to complete */

        for (i = 200000; i > 0; i--) {
                done = hba[ctlr]->access.command_completed(hba[ctlr]);
                if (done == 0) {
                        udelay(10);     /* a short fixed delay */
                } else
                        return (done);
        }
        /* Invalid address to tell caller we ran out of time */
        return 1;
}
/*****************************************************************
    start_fwbk
    Starts controller firmwares background processing. 
    Currently only the Integrated Raid controller needs this done.
    If the PCI mem address registers are written to after this, 
         data corruption may occur
*****************************************************************/
static void start_fwbk(int ctlr)
{
                id_ctlr_t *id_ctlr_buf; 
        int ret_code;

        if(     (hba[ctlr]->board_id != 0x40400E11)
                && (hba[ctlr]->board_id != 0x40480E11) )

        /* Not a Integrated Raid, so there is nothing for us to do */
                return;
        printk(KERN_DEBUG "cpqarray: Starting firmware's background"
                " processing\n");
        /* Command does not return anything, but idasend command needs a 
                buffer */
        id_ctlr_buf = kmalloc(sizeof(id_ctlr_t), GFP_KERNEL);
        if(id_ctlr_buf==NULL)
        {
                printk(KERN_WARNING "cpqarray: Out of memory. "
                        "Unable to start background processing.\n");
                return;
        }               
        ret_code = sendcmd(RESUME_BACKGROUND_ACTIVITY, ctlr, 
                id_ctlr_buf, 0, 0, 0, 0);
        if(ret_code != IO_OK)
                printk(KERN_WARNING "cpqarray: Unable to start"
                        " background processing\n");

        kfree(id_ctlr_buf);
}
/*****************************************************************
    getgeometry
    Get ida logical volume geometry from the controller 
    This is a large bit of code which once existed in two flavors,
    It is used only at init time.
*****************************************************************/
static void getgeometry(int ctlr)
{                               
        id_log_drv_t *id_ldrive;
        id_ctlr_t *id_ctlr_buf;
        sense_log_drv_stat_t *id_lstatus_buf;
        config_t *sense_config_buf;
        unsigned int log_unit, log_index;
        int ret_code, size;
        drv_info_t *drv;
        ctlr_info_t *info_p = hba[ctlr];
        int i;

        info_p->log_drv_map = 0;        
        
        id_ldrive = kzalloc(sizeof(id_log_drv_t), GFP_KERNEL);
        if (!id_ldrive) {
                printk( KERN_ERR "cpqarray:  out of memory.\n");
                goto err_0;
        }

        id_ctlr_buf = kzalloc(sizeof(id_ctlr_t), GFP_KERNEL);
        if (!id_ctlr_buf) {
                printk( KERN_ERR "cpqarray:  out of memory.\n");
                goto err_1;
        }

        id_lstatus_buf = kzalloc(sizeof(sense_log_drv_stat_t), GFP_KERNEL);
        if (!id_lstatus_buf) {
                printk( KERN_ERR "cpqarray:  out of memory.\n");
                goto err_2;
        }

        sense_config_buf = kzalloc(sizeof(config_t), GFP_KERNEL);
        if (!sense_config_buf) {
                printk( KERN_ERR "cpqarray:  out of memory.\n");
                goto err_3;
        }

        info_p->phys_drives = 0;
        info_p->log_drv_map = 0;
        info_p->drv_assign_map = 0;
        info_p->drv_spare_map = 0;
        info_p->mp_failed_drv_map = 0;  /* only initialized here */
        /* Get controllers info for this logical drive */
        ret_code = sendcmd(ID_CTLR, ctlr, id_ctlr_buf, 0, 0, 0, 0);
        if (ret_code == IO_ERROR) {
                /*
                 * If can't get controller info, set the logical drive map to 0,
                 * so the idastubopen will fail on all logical drives
                 * on the controller.
                 */
                printk(KERN_ERR "cpqarray: error sending ID controller\n");
                goto err_4;
        }

        info_p->log_drives = id_ctlr_buf->nr_drvs;
        for(i=0;i<4;i++)
                info_p->firm_rev[i] = id_ctlr_buf->firm_rev[i];
        info_p->ctlr_sig = id_ctlr_buf->cfg_sig;

        printk(" (%s)\n", info_p->product_name);
        /*
         * Initialize logical drive map to zero
         */
        log_index = 0;
        /*
         * Get drive geometry for all logical drives
         */
        if (id_ctlr_buf->nr_drvs > 16)
                printk(KERN_WARNING "cpqarray ida%d:  This driver supports "
                        "16 logical drives per controller.\n.  "
                        " Additional drives will not be "
                        "detected\n", ctlr);

        for (log_unit = 0;
             (log_index < id_ctlr_buf->nr_drvs)
             && (log_unit < NWD);
             log_unit++) {
                size = sizeof(sense_log_drv_stat_t);

                /*
                   Send "Identify logical drive status" cmd
                 */
                ret_code = sendcmd(SENSE_LOG_DRV_STAT,
                             ctlr, id_lstatus_buf, size, 0, 0, log_unit);
                if (ret_code == IO_ERROR) {
                        /*
                           If can't get logical drive status, set
                           the logical drive map to 0, so the
                           idastubopen will fail for all logical drives
                           on the controller. 
                         */
                        info_p->log_drv_map = 0;        
                        printk( KERN_WARNING
                             "cpqarray ida%d: idaGetGeometry - Controller"
                                " failed to report status of logical drive %d\n"
                         "Access to this controller has been disabled\n",
                                ctlr, log_unit);
                        goto err_4;
                }
                /*
                   Make sure the logical drive is configured
                 */
                if (id_lstatus_buf->status != LOG_NOT_CONF) {
                        ret_code = sendcmd(ID_LOG_DRV, ctlr, id_ldrive,
                               sizeof(id_log_drv_t), 0, 0, log_unit);
                        /*
                           If error, the bit for this
                           logical drive won't be set and
                           idastubopen will return error. 
                         */
                        if (ret_code != IO_ERROR) {
                                drv = &info_p->drv[log_unit];
                                drv->blk_size = id_ldrive->blk_size;
                                drv->nr_blks = id_ldrive->nr_blks;
                                drv->cylinders = id_ldrive->drv.cyl;
                                drv->heads = id_ldrive->drv.heads;
                                drv->sectors = id_ldrive->drv.sect_per_track;
                                info_p->log_drv_map |=  (1 << log_unit);

        printk(KERN_INFO "cpqarray ida/c%dd%d: blksz=%d nr_blks=%d\n",
                ctlr, log_unit, drv->blk_size, drv->nr_blks);
                                ret_code = sendcmd(SENSE_CONFIG,
                                                  ctlr, sense_config_buf,
                                 sizeof(config_t), 0, 0, log_unit);
                                if (ret_code == IO_ERROR) {
                                        info_p->log_drv_map = 0;
                                        printk(KERN_ERR "cpqarray: error sending sense config\n");
                                        goto err_4;
                                }

                                info_p->phys_drives =
                                    sense_config_buf->ctlr_phys_drv;
                                info_p->drv_assign_map
                                    |= sense_config_buf->drv_asgn_map;
                                info_p->drv_assign_map
                                    |= sense_config_buf->spare_asgn_map;
                                info_p->drv_spare_map
                                    |= sense_config_buf->spare_asgn_map;
                        }       /* end of if no error on id_ldrive */
                        log_index = log_index + 1;
                }               /* end of if logical drive configured */
        }                       /* end of for log_unit */

        /* Free all the buffers and return */
err_4:
        kfree(sense_config_buf);
err_3:
        kfree(id_lstatus_buf);
err_2:
        kfree(id_ctlr_buf);
err_1:
        kfree(id_ldrive);
err_0:
        return;
}

static void __exit cpqarray_exit(void)
{
        int i;

        pci_unregister_driver(&cpqarray_pci_driver);

        /* Double check that all controller entries have been removed */
        for(i=0; i<MAX_CTLR; i++) {
                if (hba[i] != NULL) {
                        printk(KERN_WARNING "cpqarray: Removing EISA "
                                        "controller %d\n", i);
                        cpqarray_remove_one_eisa(i);
                }
        }

        remove_proc_entry("cpqarray", proc_root_driver);
}

module_init(cpqarray_init)
module_exit(cpqarray_exit)