drivers/block/cciss.c

/*
 *    Disk Array driver for HP SA 5xxx and 6xxx Controllers
 *    Copyright 2000, 2005 Hewlett-Packard Development Company, L.P.
 *
 *    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/config.h>	/* CONFIG_PROC_FS */
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/major.h>
#include <linux/fs.h>
#include <linux/bio.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/compat.h>
#include <asm/uaccess.h>
#include <asm/io.h>

#include <linux/dma-mapping.h>
#include <linux/blkdev.h>
#include <linux/genhd.h>
#include <linux/completion.h>

#define CCISS_DRIVER_VERSION(maj,min,submin) ((maj<<16)|(min<<8)|(submin))
#define DRIVER_NAME "HP CISS Driver (v 2.6.8)"
#define DRIVER_VERSION CCISS_DRIVER_VERSION(2,6,8)

/* Embedded module documentation macros - see modules.h */
MODULE_AUTHOR("Hewlett-Packard Company");
MODULE_DESCRIPTION("Driver for HP Controller SA5xxx SA6xxx version 2.6.8");
MODULE_SUPPORTED_DEVICE("HP SA5i SA5i+ SA532 SA5300 SA5312 SA641 SA642 SA6400"
			" SA6i P600 P800 P400 P400i E200 E200i");
MODULE_LICENSE("GPL");

#include "cciss_cmd.h"
#include "cciss.h"
#include <linux/cciss_ioctl.h>

/* define the PCI info for the cards we can control */
static const struct pci_device_id cciss_pci_device_id[] = {
	{ PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISS,
			0x0E11, 0x4070, 0, 0, 0},
	{ PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSB,
                        0x0E11, 0x4080, 0, 0, 0},
	{ PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSB,
                        0x0E11, 0x4082, 0, 0, 0},
	{ PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSB,
                        0x0E11, 0x4083, 0, 0, 0},
	{ PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSC,
		0x0E11, 0x409A, 0, 0, 0},
	{ PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSC,
		0x0E11, 0x409B, 0, 0, 0},
	{ PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSC,
		0x0E11, 0x409C, 0, 0, 0},
	{ PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSC,
		0x0E11, 0x409D, 0, 0, 0},
	{ PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSC,
		0x0E11, 0x4091, 0, 0, 0},
	{ PCI_VENDOR_ID_HP, PCI_DEVICE_ID_HP_CISSA,
		0x103C, 0x3225, 0, 0, 0},
	{ PCI_VENDOR_ID_HP, PCI_DEVICE_ID_HP_CISSC,
		0x103c, 0x3223, 0, 0, 0},
	{ PCI_VENDOR_ID_HP, PCI_DEVICE_ID_HP_CISSC,
		0x103c, 0x3234, 0, 0, 0},
	{ PCI_VENDOR_ID_HP, PCI_DEVICE_ID_HP_CISSC,
		0x103c, 0x3235, 0, 0, 0},
	{ PCI_VENDOR_ID_HP, PCI_DEVICE_ID_HP_CISSD,
		0x103c, 0x3211, 0, 0, 0},
	{ PCI_VENDOR_ID_HP, PCI_DEVICE_ID_HP_CISSD,
		0x103c, 0x3212, 0, 0, 0},
	{ PCI_VENDOR_ID_HP, PCI_DEVICE_ID_HP_CISSD,
		0x103c, 0x3213, 0, 0, 0},
	{ PCI_VENDOR_ID_HP, PCI_DEVICE_ID_HP_CISSD,
		0x103c, 0x3214, 0, 0, 0},
	{ PCI_VENDOR_ID_HP, PCI_DEVICE_ID_HP_CISSD,
		0x103c, 0x3215, 0, 0, 0},
	{0,}
};
MODULE_DEVICE_TABLE(pci, cciss_pci_device_id);

#define NR_PRODUCTS (sizeof(products)/sizeof(struct board_type))

/*  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[] = {
	{ 0x40700E11, "Smart Array 5300", &SA5_access },
	{ 0x40800E11, "Smart Array 5i", &SA5B_access},
	{ 0x40820E11, "Smart Array 532", &SA5B_access},
	{ 0x40830E11, "Smart Array 5312", &SA5B_access},
	{ 0x409A0E11, "Smart Array 641", &SA5_access},
	{ 0x409B0E11, "Smart Array 642", &SA5_access},
	{ 0x409C0E11, "Smart Array 6400", &SA5_access},
	{ 0x409D0E11, "Smart Array 6400 EM", &SA5_access},
	{ 0x40910E11, "Smart Array 6i", &SA5_access},
	{ 0x3225103C, "Smart Array P600", &SA5_access},
	{ 0x3223103C, "Smart Array P800", &SA5_access},
	{ 0x3234103C, "Smart Array P400", &SA5_access},
	{ 0x3235103C, "Smart Array P400i", &SA5_access},
	{ 0x3211103C, "Smart Array E200i", &SA5_access},
	{ 0x3212103C, "Smart Array E200", &SA5_access},
	{ 0x3213103C, "Smart Array E200i", &SA5_access},
	{ 0x3214103C, "Smart Array E200i", &SA5_access},
	{ 0x3215103C, "Smart Array E200i", &SA5_access},
};

/* How long to wait (in millesconds) for board to go into simple mode */
#define MAX_CONFIG_WAIT 30000 
#define MAX_IOCTL_CONFIG_WAIT 1000

/*define how many times we will try a command because of bus resets */
#define MAX_CMD_RETRIES 3

#define READ_AHEAD 	 1024
#define NR_CMDS		 384 /* #commands that can be outstanding */
#define MAX_CTLR	32

/* Originally cciss driver only supports 8 major numbers */
#define MAX_CTLR_ORIG 	8


static ctlr_info_t *hba[MAX_CTLR];

static void do_cciss_request(request_queue_t *q);
static int cciss_open(struct inode *inode, struct file *filep);
static int cciss_release(struct inode *inode, struct file *filep);
static int cciss_ioctl(struct inode *inode, struct file *filep, 
		unsigned int cmd, unsigned long arg);

static int revalidate_allvol(ctlr_info_t *host);
static int cciss_revalidate(struct gendisk *disk);
static int deregister_disk(struct gendisk *disk);
static int register_new_disk(ctlr_info_t *h);

static void cciss_getgeometry(int cntl_num);

static void start_io( ctlr_info_t *h);
static int sendcmd( __u8 cmd, int ctlr, void *buff, size_t size,
	unsigned int use_unit_num, unsigned int log_unit, __u8 page_code,
	unsigned char *scsi3addr, int cmd_type);

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

#ifdef CONFIG_COMPAT
static long cciss_compat_ioctl(struct file *f, unsigned cmd, unsigned long arg);
#endif

static struct block_device_operations cciss_fops  = {
	.owner		= THIS_MODULE,
	.open		= cciss_open, 
	.release       	= cciss_release,
        .ioctl		= cciss_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl   = cciss_compat_ioctl,
#endif
	.revalidate_disk= cciss_revalidate,
};

/*
 * Enqueuing and dequeuing functions for cmdlists.
 */
static inline void addQ(CommandList_struct **Qptr, CommandList_struct *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 CommandList_struct *removeQ(CommandList_struct **Qptr, 
						CommandList_struct *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;
}

#include "cciss_scsi.c"		/* For SCSI tape support */

#ifdef CONFIG_PROC_FS

/*
 * Report information about this controller.
 */
#define ENG_GIG 1000000000
#define ENG_GIG_FACTOR (ENG_GIG/512)
#define RAID_UNKNOWN 6
static const char *raid_label[] = {"0","4","1(1+0)","5","5+1","ADG",
	                                   "UNKNOWN"};

static struct proc_dir_entry *proc_cciss;

static int cciss_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;
        drive_info_struct *drv;
	unsigned long flags;
        sector_t vol_sz, vol_sz_frac;

        ctlr = h->ctlr;

	/* prevent displaying bogus info during configuration
	 * or deconfiguration of a logical volume
	 */
	spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
	if (h->busy_configuring) {
		spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
	return -EBUSY;
	}
	h->busy_configuring = 1;
	spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);

        size = sprintf(buffer, "%s: HP %s Controller\n"
		"Board ID: 0x%08lx\n"
		"Firmware Version: %c%c%c%c\n"
		"IRQ: %d\n"
		"Logical drives: %d\n"
		"Current Q depth: %d\n"
		"Current # commands on controller: %d\n"
		"Max Q depth since init: %d\n"
		"Max # commands on controller since init: %d\n"
		"Max SG entries since init: %d\n\n",
                h->devname,
                h->product_name,
                (unsigned long)h->board_id,
		h->firm_ver[0], h->firm_ver[1], h->firm_ver[2], h->firm_ver[3],
                (unsigned int)h->intr,
                h->num_luns, 
		h->Qdepth, h->commands_outstanding,
		h->maxQsinceinit, h->max_outstanding, h->maxSG);

        pos += size; len += size;
	cciss_proc_tape_report(ctlr, buffer, &pos, &len);
	for(i=0; i<=h->highest_lun; i++) {

                drv = &h->drv[i];
		if (drv->block_size == 0)
			continue;

		vol_sz = drv->nr_blocks;
		vol_sz_frac = sector_div(vol_sz, ENG_GIG_FACTOR);
		vol_sz_frac *= 100;
		sector_div(vol_sz_frac, ENG_GIG_FACTOR);

		if (drv->raid_level > 5)
			drv->raid_level = RAID_UNKNOWN;
		size = sprintf(buffer+len, "cciss/c%dd%d:"
				"\t%4u.%02uGB\tRAID %s\n",
				ctlr, i, (int)vol_sz, (int)vol_sz_frac,
				raid_label[drv->raid_level]);
                pos += size; len += size;
        }

        *eof = 1;
        *start = buffer+offset;
        len -= offset;
        if (len>length)
                len = length;
	h->busy_configuring = 0;
        return len;
}

static int 
cciss_proc_write(struct file *file, const char __user *buffer, 
			unsigned long count, void *data)
{
	unsigned char cmd[80];
	int len;
#ifdef CONFIG_CISS_SCSI_TAPE
	ctlr_info_t *h = (ctlr_info_t *) data;
	int rc;
#endif

	if (count > sizeof(cmd)-1) return -EINVAL;
	if (copy_from_user(cmd, buffer, count)) return -EFAULT;
	cmd[count] = '\0';
	len = strlen(cmd);	// above 3 lines ensure safety
	if (len && cmd[len-1] == '\n')
		cmd[--len] = '\0';
#	ifdef CONFIG_CISS_SCSI_TAPE
		if (strcmp("engage scsi", cmd)==0) {
			rc = cciss_engage_scsi(h->ctlr);
			if (rc != 0) return -rc;
			return count;
		}
		/* might be nice to have "disengage" too, but it's not 
		   safely possible. (only 1 module use count, lock issues.) */
#	endif
	return -EINVAL;
}

/*
 * Get us a file in /proc/cciss that says something about each controller.
 * Create /proc/cciss if it doesn't exist yet.
 */
static void __devinit cciss_procinit(int i)
{
	struct proc_dir_entry *pde;

        if (proc_cciss == NULL) {
                proc_cciss = proc_mkdir("cciss", proc_root_driver);
                if (!proc_cciss) 
			return;
        }

	pde = create_proc_read_entry(hba[i]->devname, 
		S_IWUSR | S_IRUSR | S_IRGRP | S_IROTH, 
		proc_cciss, cciss_proc_get_info, hba[i]);
	pde->write_proc = cciss_proc_write;
}
#endif /* CONFIG_PROC_FS */

/* 
 * For operations that cannot sleep, a command block is allocated at init, 
 * and managed by cmd_alloc() and cmd_free() using a simple bitmap to track
 * which ones are free or in use.  For operations that can wait for kmalloc 
 * to possible sleep, this routine can be called with get_from_pool set to 0. 
 * cmd_free() MUST be called with a got_from_pool set to 0 if cmd_alloc was. 
 */ 
static CommandList_struct * cmd_alloc(ctlr_info_t *h, int get_from_pool)
{
	CommandList_struct *c;
	int i; 
	u64bit temp64;
	dma_addr_t cmd_dma_handle, err_dma_handle;

	if (!get_from_pool)
	{
		c = (CommandList_struct *) pci_alloc_consistent(
			h->pdev, sizeof(CommandList_struct), &cmd_dma_handle); 
        	if(c==NULL)
                 	return NULL;
		memset(c, 0, sizeof(CommandList_struct));

		c->err_info = (ErrorInfo_struct *)pci_alloc_consistent(
					h->pdev, sizeof(ErrorInfo_struct), 
					&err_dma_handle);
	
		if (c->err_info == NULL)
		{
			pci_free_consistent(h->pdev, 
				sizeof(CommandList_struct), c, cmd_dma_handle);
			return NULL;
		}
		memset(c->err_info, 0, sizeof(ErrorInfo_struct));
	} else /* get it out of the controllers pool */ 
	{
	     	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);
#ifdef CCISS_DEBUG
		printk(KERN_DEBUG "cciss: using command buffer %d\n", i);
#endif
                c = h->cmd_pool + i;
		memset(c, 0, sizeof(CommandList_struct));
		cmd_dma_handle = h->cmd_pool_dhandle 
					+ i*sizeof(CommandList_struct);
		c->err_info = h->errinfo_pool + i;
		memset(c->err_info, 0, sizeof(ErrorInfo_struct));
		err_dma_handle = h->errinfo_pool_dhandle 
					+ i*sizeof(ErrorInfo_struct);
                h->nr_allocs++;
        }

	c->busaddr = (__u32) cmd_dma_handle;
	temp64.val = (__u64) err_dma_handle;	
	c->ErrDesc.Addr.lower = temp64.val32.lower;
	c->ErrDesc.Addr.upper = temp64.val32.upper;
	c->ErrDesc.Len = sizeof(ErrorInfo_struct);
	
	c->ctlr = h->ctlr;
        return c;


}

/* 
 * Frees a command block that was previously allocated with cmd_alloc(). 
 */
static void cmd_free(ctlr_info_t *h, CommandList_struct *c, int got_from_pool)
{
	int i;
	u64bit temp64;

	if( !got_from_pool)
	{ 
		temp64.val32.lower = c->ErrDesc.Addr.lower;
		temp64.val32.upper = c->ErrDesc.Addr.upper;
		pci_free_consistent(h->pdev, sizeof(ErrorInfo_struct), 
			c->err_info, (dma_addr_t) temp64.val);
		pci_free_consistent(h->pdev, sizeof(CommandList_struct), 
			c, (dma_addr_t) 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++;
        }
}

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

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

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

#ifdef CCISS_DEBUG
	printk(KERN_DEBUG "cciss_open %s\n", inode->i_bdev->bd_disk->disk_name);
#endif /* CCISS_DEBUG */ 

	/*
	 * Root is allowed to open raw volume zero even if it's not configured
	 * so array config can still work. Root is also allowed to open any
	 * volume that has a LUN ID, so it can issue IOCTL to reread the
	 * disk information.  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_blocks == 0) {
		if (iminor(inode) != 0)	{ 	/* not node 0? */
			/* if not node 0 make sure it is a partition = 0 */
			if (iminor(inode) & 0x0f) {
			return -ENXIO;
				/* if it is, make sure we have a LUN ID */
			} else if (drv->LunID == 0) {
				return -ENXIO;
			}
		}
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;
	}
	drv->usage_count++;
	host->usage_count++;
	return 0;
}
/*
 * Close.  Sync first.
 */
static int cciss_release(struct inode *inode, struct file *filep)
{
	ctlr_info_t *host = get_host(inode->i_bdev->bd_disk);
	drive_info_struct *drv = get_drv(inode->i_bdev->bd_disk);

#ifdef CCISS_DEBUG
	printk(KERN_DEBUG "cciss_release %s\n", inode->i_bdev->bd_disk->disk_name);
#endif /* CCISS_DEBUG */

	drv->usage_count--;
	host->usage_count--;
	return 0;
}

#ifdef CONFIG_COMPAT

static int do_ioctl(struct file *f, unsigned cmd, unsigned long arg)
{
	int ret;
	lock_kernel();
	ret = cciss_ioctl(f->f_dentry->d_inode, f, cmd, arg);
	unlock_kernel();
	return ret;
}

static int cciss_ioctl32_passthru(struct file *f, unsigned cmd, unsigned long arg);
static int cciss_ioctl32_big_passthru(struct file *f, unsigned cmd, unsigned long arg);

static long cciss_compat_ioctl(struct file *f, unsigned cmd, unsigned long arg)
{
	switch (cmd) {
	case CCISS_GETPCIINFO:
	case CCISS_GETINTINFO:
	case CCISS_SETINTINFO:
	case CCISS_GETNODENAME:
	case CCISS_SETNODENAME:
	case CCISS_GETHEARTBEAT:
	case CCISS_GETBUSTYPES:
	case CCISS_GETFIRMVER:
	case CCISS_GETDRIVVER:
	case CCISS_REVALIDVOLS:
	case CCISS_DEREGDISK:
	case CCISS_REGNEWDISK:
	case CCISS_REGNEWD:
	case CCISS_RESCANDISK:
	case CCISS_GETLUNINFO:
		return do_ioctl(f, cmd, arg);

	case CCISS_PASSTHRU32:
		return cciss_ioctl32_passthru(f, cmd, arg);
	case CCISS_BIG_PASSTHRU32:
		return cciss_ioctl32_big_passthru(f, cmd, arg);

	default:
		return -ENOIOCTLCMD;
	}
}

static int cciss_ioctl32_passthru(struct file *f, unsigned cmd, unsigned long arg)
{
	IOCTL32_Command_struct __user *arg32 =
		(IOCTL32_Command_struct __user *) arg;
	IOCTL_Command_struct arg64;
	IOCTL_Command_struct __user *p = compat_alloc_user_space(sizeof(arg64));
	int err;
	u32 cp;

	err = 0;
	err |= copy_from_user(&arg64.LUN_info, &arg32->LUN_info, sizeof(arg64.LUN_info));
	err |= copy_from_user(&arg64.Request, &arg32->Request, sizeof(arg64.Request));
	err |= copy_from_user(&arg64.error_info, &arg32->error_info, sizeof(arg64.error_info));
	err |= get_user(arg64.buf_size, &arg32->buf_size);
	err |= get_user(cp, &arg32->buf);
	arg64.buf = compat_ptr(cp);
	err |= copy_to_user(p, &arg64, sizeof(arg64));

	if (err)
		return -EFAULT;

	err = do_ioctl(f, CCISS_PASSTHRU, (unsigned long) p);
	if (err)
		return err;
	err |= copy_in_user(&arg32->error_info, &p->error_info, sizeof(arg32->error_info));
	if (err)
		return -EFAULT;
	return err;
}

static int cciss_ioctl32_big_passthru(struct file *file, unsigned cmd, unsigned long arg)
{
	BIG_IOCTL32_Command_struct __user *arg32 =
		(BIG_IOCTL32_Command_struct __user *) arg;
	BIG_IOCTL_Command_struct arg64;
	BIG_IOCTL_Command_struct __user *p = compat_alloc_user_space(sizeof(arg64));
	int err;
	u32 cp;

	err = 0;
	err |= copy_from_user(&arg64.LUN_info, &arg32->LUN_info, sizeof(arg64.LUN_info));
	err |= copy_from_user(&arg64.Request, &arg32->Request, sizeof(arg64.Request));
	err |= copy_from_user(&arg64.error_info, &arg32->error_info, sizeof(arg64.error_info));
	err |= get_user(arg64.buf_size, &arg32->buf_size);
	err |= get_user(arg64.malloc_size, &arg32->malloc_size);
	err |= get_user(cp, &arg32->buf);
	arg64.buf = compat_ptr(cp);
	err |= copy_to_user(p, &arg64, sizeof(arg64));

	if (err)
		 return -EFAULT;

	err = do_ioctl(file, CCISS_BIG_PASSTHRU, (unsigned long) p);
	if (err)
		return err;
	err |= copy_in_user(&arg32->error_info, &p->error_info, sizeof(arg32->error_info));
	if (err)
		return -EFAULT;
	return err;
}
#endif
/*
 * ioctl 
 */
static int cciss_ioctl(struct inode *inode, struct file *filep, 
		unsigned int cmd, unsigned long arg)
{
	struct block_device *bdev = inode->i_bdev;
	struct gendisk *disk = bdev->bd_disk;
	ctlr_info_t *host = get_host(disk);
	drive_info_struct *drv = get_drv(disk);
	int ctlr = host->ctlr;
	void __user *argp = (void __user *)arg;

#ifdef CCISS_DEBUG
	printk(KERN_DEBUG "cciss_ioctl: Called with cmd=%x %lx\n", cmd, arg);
#endif /* CCISS_DEBUG */ 
	
	switch(cmd) {
	case HDIO_GETGEO:
	{
                struct hd_geometry driver_geo;
                if (drv->cylinders) {
                        driver_geo.heads = drv->heads;
                        driver_geo.sectors = drv->sectors;
                        driver_geo.cylinders = drv->cylinders;
                } else
			return -ENXIO;
                driver_geo.start= get_start_sect(inode->i_bdev);
                if (copy_to_user(argp, &driver_geo, sizeof(struct hd_geometry)))
                        return  -EFAULT;
                return(0);
	}

	case CCISS_GETPCIINFO:
	{
		cciss_pci_info_struct pciinfo;

		if (!arg) return -EINVAL;
		pciinfo.domain = pci_domain_nr(host->pdev->bus);
		pciinfo.bus = host->pdev->bus->number;
		pciinfo.dev_fn = host->pdev->devfn;
		pciinfo.board_id = host->board_id;
		if (copy_to_user(argp, &pciinfo,  sizeof( cciss_pci_info_struct )))
			return  -EFAULT;
		return(0);
	}	
	case CCISS_GETINTINFO:
	{
		cciss_coalint_struct intinfo;
		if (!arg) return -EINVAL;
		intinfo.delay = readl(&host->cfgtable->HostWrite.CoalIntDelay);
		intinfo.count = readl(&host->cfgtable->HostWrite.CoalIntCount);
		if (copy_to_user(argp, &intinfo, sizeof( cciss_coalint_struct )))
			return -EFAULT;
                return(0);
        }
	case CCISS_SETINTINFO:
        {
                cciss_coalint_struct intinfo;
		unsigned long flags;
		int i;

		if (!arg) return -EINVAL;	
		if (!capable(CAP_SYS_ADMIN)) return -EPERM;
		if (copy_from_user(&intinfo, argp, sizeof( cciss_coalint_struct)))
			return -EFAULT;
		if ( (intinfo.delay == 0 ) && (intinfo.count == 0))

		{
//			printk("cciss_ioctl: delay and count cannot be 0\n");
			return( -EINVAL);
		}
		spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
		/* Update the field, and then ring the doorbell */ 
		writel( intinfo.delay, 
			&(host->cfgtable->HostWrite.CoalIntDelay));
		writel( intinfo.count, 
                        &(host->cfgtable->HostWrite.CoalIntCount));
		writel( CFGTBL_ChangeReq, host->vaddr + SA5_DOORBELL);

		for(i=0;i<MAX_IOCTL_CONFIG_WAIT;i++) {
			if (!(readl(host->vaddr + SA5_DOORBELL) 
					& CFGTBL_ChangeReq))
				break;
			/* delay and try again */
			udelay(1000);
		}	
		spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
		if (i >= MAX_IOCTL_CONFIG_WAIT)
			return -EAGAIN;
                return(0);
        }
	case CCISS_GETNODENAME:
        {
                NodeName_type NodeName;
		int i; 

		if (!arg) return -EINVAL;
		for(i=0;i<16;i++)
			NodeName[i] = readb(&host->cfgtable->ServerName[i]);
                if (copy_to_user(argp, NodeName, sizeof( NodeName_type)))
                	return  -EFAULT;
                return(0);
        }
	case CCISS_SETNODENAME:
	{
		NodeName_type NodeName;
		unsigned long flags;
		int i;

		if (!arg) return -EINVAL;
		if (!capable(CAP_SYS_ADMIN)) return -EPERM;
		
		if (copy_from_user(NodeName, argp, sizeof( NodeName_type)))
			return -EFAULT;

		spin_lock_irqsave(CCISS_LOCK(ctlr), flags);

			/* Update the field, and then ring the doorbell */ 
		for(i=0;i<16;i++)
			writeb( NodeName[i], &host->cfgtable->ServerName[i]);
			
		writel( CFGTBL_ChangeReq, host->vaddr + SA5_DOORBELL);

		for(i=0;i<MAX_IOCTL_CONFIG_WAIT;i++) {
			if (!(readl(host->vaddr + SA5_DOORBELL) 
					& CFGTBL_ChangeReq))
				break;
			/* delay and try again */
			udelay(1000);
		}	
		spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
		if (i >= MAX_IOCTL_CONFIG_WAIT)
			return -EAGAIN;
                return(0);
        }

	case CCISS_GETHEARTBEAT:
        {
                Heartbeat_type heartbeat;

		if (!arg) return -EINVAL;
                heartbeat = readl(&host->cfgtable->HeartBeat);
                if (copy_to_user(argp, &heartbeat, sizeof( Heartbeat_type)))
                	return -EFAULT;
                return(0);
        }
	case CCISS_GETBUSTYPES:
        {
                BusTypes_type BusTypes;

		if (!arg) return -EINVAL;
                BusTypes = readl(&host->cfgtable->BusTypes);
                if (copy_to_user(argp, &BusTypes, sizeof( BusTypes_type) ))
                	return  -EFAULT;
                return(0);
        }
	case CCISS_GETFIRMVER:
        {
		FirmwareVer_type firmware;

		if (!arg) return -EINVAL;
		memcpy(firmware, host->firm_ver, 4);

                if (copy_to_user(argp, firmware, sizeof( FirmwareVer_type)))
                	return -EFAULT;
                return(0);
        }
        case CCISS_GETDRIVVER:
        {
		DriverVer_type DriverVer = DRIVER_VERSION;

                if (!arg) return -EINVAL;

                if (copy_to_user(argp, &DriverVer, sizeof( DriverVer_type) ))
                	return -EFAULT;
                return(0);
        }

	case CCISS_REVALIDVOLS:
		if (bdev != bdev->bd_contains || drv != host->drv)
			return -ENXIO;
                return revalidate_allvol(host);

 	case CCISS_GETLUNINFO: {
 		LogvolInfo_struct luninfo;
 		
 		luninfo.LunID = drv->LunID;
 		luninfo.num_opens = drv->usage_count;
 		luninfo.num_parts = 0;
 		if (copy_to_user(argp, &luninfo,
 				sizeof(LogvolInfo_struct)))
 			return -EFAULT;
 		return(0);
 	}
	case CCISS_DEREGDISK:
		return deregister_disk(disk);

	case CCISS_REGNEWD:
		return register_new_disk(host);

	case CCISS_PASSTHRU:
	{
		IOCTL_Command_struct iocommand;
		CommandList_struct *c;
		char 	*buff = NULL;
		u64bit	temp64;
		unsigned long flags;
		DECLARE_COMPLETION(wait);

		if (!arg) return -EINVAL;
	
		if (!capable(CAP_SYS_RAWIO)) return -EPERM;

		if (copy_from_user(&iocommand, argp, sizeof( IOCTL_Command_struct) ))
			return -EFAULT;
		if((iocommand.buf_size < 1) && 
				(iocommand.Request.Type.Direction != XFER_NONE))
		{	
			return -EINVAL;
		} 
#if 0 /* 'buf_size' member is 16-bits, and always smaller than kmalloc limit */
		/* Check kmalloc limits */
		if(iocommand.buf_size > 128000)
			return -EINVAL;
#endif
		if(iocommand.buf_size > 0)
		{
			buff =  kmalloc(iocommand.buf_size, GFP_KERNEL);
			if( buff == NULL) 
				return -EFAULT;
		}
		if (iocommand.Request.Type.Direction == XFER_WRITE)
		{
			/* Copy the data into the buffer we created */ 
			if (copy_from_user(buff, iocommand.buf, iocommand.buf_size))
			{
				kfree(buff);
				return -EFAULT;
			}
		} else {
			memset(buff, 0, iocommand.buf_size);
		}
		if ((c = cmd_alloc(host , 0)) == NULL)
		{
			kfree(buff);
			return -ENOMEM;
		}
			// Fill in the command type 
		c->cmd_type = CMD_IOCTL_PEND;
			// Fill in Command Header 
		c->Header.ReplyQueue = 0;  // unused in simple mode
		if( iocommand.buf_size > 0) 	// buffer to fill 
		{
			c->Header.SGList = 1;
			c->Header.SGTotal= 1;
		} else	// no buffers to fill  
		{
			c->Header.SGList = 0;
                	c->Header.SGTotal= 0;
		}
		c->Header.LUN = iocommand.LUN_info;
		c->Header.Tag.lower = c->busaddr;  // use the kernel address the cmd block for tag
		
		// Fill in Request block 
		c->Request = iocommand.Request; 
	
		// Fill in the scatter gather information
		if (iocommand.buf_size > 0 ) 
		{
			temp64.val = pci_map_single( host->pdev, buff,
                                        iocommand.buf_size, 
                                PCI_DMA_BIDIRECTIONAL);	
			c->SG[0].Addr.lower = temp64.val32.lower;
			c->SG[0].Addr.upper = temp64.val32.upper;
			c->SG[0].Len = iocommand.buf_size;
			c->SG[0].Ext = 0;  // we are not chaining
		}
		c->waiting = &wait;

		/* Put the request on the tail of the request queue */
		spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
		addQ(&host->reqQ, c);
		host->Qdepth++;
		start_io(host);
		spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);

		wait_for_completion(&wait);

		/* unlock the buffers from DMA */
		temp64.val32.lower = c->SG[0].Addr.lower;
                temp64.val32.upper = c->SG[0].Addr.upper;
                pci_unmap_single( host->pdev, (dma_addr_t) temp64.val,
                	iocommand.buf_size, PCI_DMA_BIDIRECTIONAL);

		/* Copy the error information out */ 
		iocommand.error_info = *(c->err_info);
		if ( copy_to_user(argp, &iocommand, sizeof( IOCTL_Command_struct) ) )
		{
			kfree(buff);
			cmd_free(host, c, 0);
			return( -EFAULT);	
		} 	

		if (iocommand.Request.Type.Direction == XFER_READ)
                {
                        /* Copy the data out of the buffer we created */
                        if (copy_to_user(iocommand.buf, buff, iocommand.buf_size))
			{
                        	kfree(buff);
				cmd_free(host, c, 0);
				return -EFAULT;
			}
                }
                kfree(buff);
		cmd_free(host, c, 0);
                return(0);
	} 
	case CCISS_BIG_PASSTHRU: {
		BIG_IOCTL_Command_struct *ioc;
		CommandList_struct *c;
		unsigned char **buff = NULL;
		int	*buff_size = NULL;
		u64bit	temp64;
		unsigned long flags;
		BYTE sg_used = 0;
		int status = 0;
		int i;
		DECLARE_COMPLETION(wait);
		__u32   left;
		__u32	sz;
		BYTE    __user *data_ptr;

		if (!arg)
			return -EINVAL;
		if (!capable(CAP_SYS_RAWIO))
			return -EPERM;
		ioc = (BIG_IOCTL_Command_struct *) 
			kmalloc(sizeof(*ioc), GFP_KERNEL);
		if (!ioc) {
			status = -ENOMEM;
			goto cleanup1;
		}
		if (copy_from_user(ioc, argp, sizeof(*ioc))) {
			status = -EFAULT;
			goto cleanup1;
		}
		if ((ioc->buf_size < 1) &&
			(ioc->Request.Type.Direction != XFER_NONE)) {
				status = -EINVAL;
				goto cleanup1;
		}
		/* Check kmalloc limits  using all SGs */
		if (ioc->malloc_size > MAX_KMALLOC_SIZE) {
			status = -EINVAL;
			goto cleanup1;
		}
		if (ioc->buf_size > ioc->malloc_size * MAXSGENTRIES) {
			status = -EINVAL;
			goto cleanup1;
		}
		buff = (unsigned char **) kmalloc(MAXSGENTRIES * 
				sizeof(char *), GFP_KERNEL);
		if (!buff) {
			status = -ENOMEM;
			goto cleanup1;
		}
		memset(buff, 0, MAXSGENTRIES);
		buff_size = (int *) kmalloc(MAXSGENTRIES * sizeof(int), 
					GFP_KERNEL);
		if (!buff_size) {
			status = -ENOMEM;
			goto cleanup1;
		}
		left = ioc->buf_size;
		data_ptr = ioc->buf;
		while (left) {
			sz = (left > ioc->malloc_size) ? ioc->malloc_size : left;
			buff_size[sg_used] = sz;
			buff[sg_used] = kmalloc(sz, GFP_KERNEL);
			if (buff[sg_used] == NULL) {
				status = -ENOMEM;
				goto cleanup1;
			}
			if (ioc->Request.Type.Direction == XFER_WRITE &&
				copy_from_user(buff[sg_used], data_ptr, sz)) {
					status = -ENOMEM;
					goto cleanup1;			
			} else {
				memset(buff[sg_used], 0, sz);
			}
			left -= sz;
			data_ptr += sz;
			sg_used++;
		}
		if ((c = cmd_alloc(host , 0)) == NULL) {
			status = -ENOMEM;
			goto cleanup1;	
		}
		c->cmd_type = CMD_IOCTL_PEND;
		c->Header.ReplyQueue = 0;
		
		if( ioc->buf_size > 0) {
			c->Header.SGList = sg_used;
			c->Header.SGTotal= sg_used;
		} else { 
			c->Header.SGList = 0;
			c->Header.SGTotal= 0;
		}
		c->Header.LUN = ioc->LUN_info;
		c->Header.Tag.lower = c->busaddr;
		
		c->Request = ioc->Request;
		if (ioc->buf_size > 0 ) {
			int i;
			for(i=0; i<sg_used; i++) {
				temp64.val = pci_map_single( host->pdev, buff[i],
					buff_size[i],
					PCI_DMA_BIDIRECTIONAL);
				c->SG[i].Addr.lower = temp64.val32.lower;
				c->SG[i].Addr.upper = temp64.val32.upper;
				c->SG[i].Len = buff_size[i];
				c->SG[i].Ext = 0;  /* we are not chaining */
			}
		}
		c->waiting = &wait;
		/* Put the request on the tail of the request queue */
		spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
		addQ(&host->reqQ, c);
		host->Qdepth++;
		start_io(host);
		spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
		wait_for_completion(&wait);
		/* unlock the buffers from DMA */
		for(i=0; i<sg_used; i++) {
			temp64.val32.lower = c->SG[i].Addr.lower;
			temp64.val32.upper = c->SG[i].Addr.upper;
			pci_unmap_single( host->pdev, (dma_addr_t) temp64.val,
				buff_size[i], PCI_DMA_BIDIRECTIONAL);
		}
		/* Copy the error information out */
		ioc->error_info = *(c->err_info);
		if (copy_to_user(argp, ioc, sizeof(*ioc))) {
			cmd_free(host, c, 0);
			status = -EFAULT;
			goto cleanup1;
		}
		if (ioc->Request.Type.Direction == XFER_READ) {
			/* Copy the data out of the buffer we created */
			BYTE __user *ptr = ioc->buf;
	        	for(i=0; i< sg_used; i++) {
				if (copy_to_user(ptr, buff[i], buff_size[i])) {
					cmd_free(host, c, 0);
					status = -EFAULT;
					goto cleanup1;
				}
				ptr += buff_size[i];
			}
		}
		cmd_free(host, c, 0);
		status = 0;
cleanup1:
		if (buff) {
			for(i=0; i<sg_used; i++)
				if(buff[i] != NULL)
					kfree(buff[i]);
			kfree(buff);
		}
		if (buff_size)
			kfree(buff_size);
		if (ioc)
			kfree(ioc);
		return(status);
	}
	default:
		return -ENOTTY;
	}
	
}

/*
 * 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, i;
	unsigned long flags;

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

	for(i=0; i< NWD; i++) {
		struct gendisk *disk = host->gendisk[i];
		if (disk->flags & GENHD_FL_UP)
			del_gendisk(disk);
	}

        /*
         * Set the partition and block size structures for all volumes
         * on this controller to zero.  We will reread all of this data
         */
        memset(host->drv,        0, sizeof(drive_info_struct)
						* CISS_MAX_LUN);
        /*
         * 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, CCISS_INTR_OFF);
        cciss_getgeometry(ctlr);
        host->access.set_intr_mask(host, CCISS_INTR_ON);

	/* Loop through each real device */ 
	for (i = 0; i < NWD; i++) {
		struct gendisk *disk = host->gendisk[i];
		drive_info_struct *drv = &(host->drv[i]);
		/* we must register the controller even if no disks exist */
		/* this is for the online array utilities */
		if (!drv->heads && i)
			continue;
		blk_queue_hardsect_size(drv->queue, drv->block_size);
		set_capacity(disk, drv->nr_blocks);
		add_disk(disk);
	}
        host->usage_count--;
        return 0;
}

static int deregister_disk(struct gendisk *disk)
{
	unsigned long flags;
	ctlr_info_t *h = get_host(disk);
	drive_info_struct *drv = get_drv(disk);
	int ctlr = h->ctlr;

	if (!capable(CAP_SYS_RAWIO))
		return -EPERM;

	spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
	/* make sure logical volume is NOT is use */
	if( drv->usage_count > 1) {
		spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
                return -EBUSY;
	}
	drv->usage_count++;
	spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);

	/* invalidate the devices and deregister the disk */ 
	if (disk->flags & GENHD_FL_UP)
		del_gendisk(disk);
	/* check to see if it was the last disk */
	if (drv == h->drv + h->highest_lun) {
		/* if so, find the new hightest lun */
		int i, newhighest =-1;
		for(i=0; i<h->highest_lun; i++) {
			/* if the disk has size > 0, it is available */
			if (h->drv[i].nr_blocks)
				newhighest = i;
		}
		h->highest_lun = newhighest;
				
	}
	--h->num_luns;
	/* zero out the disk size info */ 
	drv->nr_blocks = 0;
	drv->block_size = 0;
	drv->cylinders = 0;
	drv->LunID = 0;
	return(0);
}
static int fill_cmd(CommandList_struct *c, __u8 cmd, int ctlr, void *buff,
	size_t size,
	unsigned int use_unit_num, /* 0: address the controller,
				      1: address logical volume log_unit,
				      2: periph device address is scsi3addr */
	unsigned int log_unit, __u8 page_code, unsigned char *scsi3addr,
	int cmd_type)
{
	ctlr_info_t *h= hba[ctlr];
	u64bit buff_dma_handle;
	int status = IO_OK;

	c->cmd_type = CMD_IOCTL_PEND;
	c->Header.ReplyQueue = 0;
	if( buff != NULL) {
		c->Header.SGList = 1;
		c->Header.SGTotal= 1;
	} else {
		c->Header.SGList = 0;
                c->Header.SGTotal= 0;
	}
	c->Header.Tag.lower = c->busaddr;

	c->Request.Type.Type = cmd_type;
	if (cmd_type == TYPE_CMD) {
		switch(cmd) {
		case  CISS_INQUIRY:
			/* If the logical unit number is 0 then, this is going
			to controller so It's a physical command
			mode = 0 target = 0.  So we have nothing to write.
			otherwise, if use_unit_num == 1,
			mode = 1(volume set addressing) target = LUNID
			otherwise, if use_unit_num == 2,
			mode = 0(periph dev addr) target = scsi3addr */
			if (use_unit_num == 1) {
				c->Header.LUN.LogDev.VolId=
					h->drv[log_unit].LunID;
                        	c->Header.LUN.LogDev.Mode = 1;
			} else if (use_unit_num == 2) {
				memcpy(c->Header.LUN.LunAddrBytes,scsi3addr,8);
				c->Header.LUN.LogDev.Mode = 0;
			}
			/* are we trying to read a vital product page */
			if(page_code != 0) {
				c->Request.CDB[1] = 0x01;
				c->Request.CDB[2] = page_code;
			}
			c->Request.CDBLen = 6;
			c->Request.Type.Attribute = ATTR_SIMPLE;  
			c->Request.Type.Direction = XFER_READ;
			c->Request.Timeout = 0;
			c->Request.CDB[0] =  CISS_INQUIRY;
			c->Request.CDB[4] = size  & 0xFF;  
		break;
		case CISS_REPORT_LOG:
		case CISS_REPORT_PHYS:
                        /* Talking to controller so It's a physical command
			   mode = 00 target = 0.  Nothing to write.
                        */
			c->Request.CDBLen = 12;
			c->Request.Type.Attribute = ATTR_SIMPLE;
			c->Request.Type.Direction = XFER_READ;
			c->Request.Timeout = 0;
			c->Request.CDB[0] = cmd;
			c->Request.CDB[6] = (size >> 24) & 0xFF;  //MSB
			c->Request.CDB[7] = (size >> 16) & 0xFF;
			c->Request.CDB[8] = (size >> 8) & 0xFF;
			c->Request.CDB[9] = size & 0xFF;
			break;

		case CCISS_READ_CAPACITY:
			c->Header.LUN.LogDev.VolId = h->drv[log_unit].LunID;
			c->Header.LUN.LogDev.Mode = 1;
			c->Request.CDBLen = 10;
			c->Request.Type.Attribute = ATTR_SIMPLE;
			c->Request.Type.Direction = XFER_READ;
			c->Request.Timeout = 0;
			c->Request.CDB[0] = cmd;
		break;
		case CCISS_CACHE_FLUSH:
			c->Request.CDBLen = 12;
			c->Request.Type.Attribute = ATTR_SIMPLE;
			c->Request.Type.Direction = XFER_WRITE;
			c->Request.Timeout = 0;
			c->Request.CDB[0] = BMIC_WRITE;
			c->Request.CDB[6] = BMIC_CACHE_FLUSH;
		break;
		default:
			printk(KERN_WARNING
				"cciss%d:  Unknown Command 0x%c\n", ctlr, cmd);
			return(IO_ERROR);
		}
	} else if (cmd_type == TYPE_MSG) {
		switch (cmd) {
		case 3:	/* No-Op message */
			c->Request.CDBLen = 1;
			c->Request.Type.Attribute = ATTR_SIMPLE;
			c->Request.Type.Direction = XFER_WRITE;
			c->Request.Timeout = 0;
			c->Request.CDB[0] = cmd;
			break;
		default:
			printk(KERN_WARNING
				"cciss%d: unknown message type %d\n",
				ctlr, cmd);
			return IO_ERROR;
		}
	} else {
		printk(KERN_WARNING
			"cciss%d: unknown command type %d\n", ctlr, cmd_type);
		return IO_ERROR;
	}
	/* Fill in the scatter gather information */
	if (size > 0) {
		buff_dma_handle.val = (__u64) pci_map_single(h->pdev,
			buff, size, PCI_DMA_BIDIRECTIONAL);
		c->SG[0].Addr.lower = buff_dma_handle.val32.lower;
		c->SG[0].Addr.upper = buff_dma_handle.val32.upper;
		c->SG[0].Len = size;
		c->SG[0].Ext = 0;  /* we are not chaining */
	}
	return status;
}
static int sendcmd_withirq(__u8	cmd,
	int	ctlr,
	void	*buff,
	size_t	size,
	unsigned int use_unit_num,
	unsigned int log_unit,
	__u8	page_code,
	int cmd_type)
{
	ctlr_info_t *h = hba[ctlr];
	CommandList_struct *c;
	u64bit	buff_dma_handle;
	unsigned long flags;
	int return_status;
	DECLARE_COMPLETION(wait);
	
	if ((c = cmd_alloc(h , 0)) == NULL)
		return -ENOMEM;
	return_status = fill_cmd(c, cmd, ctlr, buff, size, use_unit_num,
		log_unit, page_code, NULL, cmd_type);
	if (return_status != IO_OK) {
		cmd_free(h, c, 0);
		return return_status;
	}
resend_cmd2:
	c->waiting = &wait;
	
	/* Put the request on the tail of the queue and send it */
	spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
	addQ(&h->reqQ, c);
	h->Qdepth++;
	start_io(h);
	spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
	
	wait_for_completion(&wait);

	if(c->err_info->CommandStatus != 0) 
	{ /* an error has occurred */ 
		switch(c->err_info->CommandStatus)
		{
			case CMD_TARGET_STATUS:
				printk(KERN_WARNING "cciss: cmd %p has "
					" completed with errors\n", c);
				if( c->err_info->ScsiStatus)
                		{
                    			printk(KERN_WARNING "cciss: cmd %p "
					"has SCSI Status = %x\n",
                        			c,  
						c->err_info->ScsiStatus);
                		}

			break;
			case CMD_DATA_UNDERRUN:
			case CMD_DATA_OVERRUN:
			/* expected for inquire and report lun commands */
			break;
			case CMD_INVALID:
				printk(KERN_WARNING "cciss: Cmd %p is "
					"reported invalid\n", c);
				return_status = IO_ERROR;
			break;
			case CMD_PROTOCOL_ERR:
                                printk(KERN_WARNING "cciss: cmd %p has "
					"protocol error \n", c);
                                return_status = IO_ERROR;
                        break;
case CMD_HARDWARE_ERR:
                                printk(KERN_WARNING "cciss: cmd %p had " 
                                        " hardware error\n", c);
                                return_status = IO_ERROR;
                        break;
			case CMD_CONNECTION_LOST:
				printk(KERN_WARNING "cciss: cmd %p had "
					"connection lost\n", c);
				return_status = IO_ERROR;
			break;
			case CMD_ABORTED:
				printk(KERN_WARNING "cciss: cmd %p was "
					"aborted\n", c);
				return_status = IO_ERROR;
			break;
			case CMD_ABORT_FAILED:
				printk(KERN_WARNING "cciss: cmd %p reports "
					"abort failed\n", c);
				return_status = IO_ERROR;
			break;
			case CMD_UNSOLICITED_ABORT:
				printk(KERN_WARNING 
					"cciss%d: unsolicited abort %p\n",
					ctlr, c);
				if (c->retry_count < MAX_CMD_RETRIES) {
					printk(KERN_WARNING 
						"cciss%d: retrying %p\n", 
						ctlr, c);
					c->retry_count++;
					/* erase the old error information */
					memset(c->err_info, 0,
						sizeof(ErrorInfo_struct));
					return_status = IO_OK;
					INIT_COMPLETION(wait);
					goto resend_cmd2;
				}
				return_status = IO_ERROR;
			break;
			default:
				printk(KERN_WARNING "cciss: cmd %p returned "
					"unknown status %x\n", c, 
						c->err_info->CommandStatus); 
				return_status = IO_ERROR;
		}
	}	
	/* unlock the buffers from DMA */
	pci_unmap_single( h->pdev, (dma_addr_t) buff_dma_handle.val,
			size, PCI_DMA_BIDIRECTIONAL);
	cmd_free(h, c, 0);
        return(return_status);

}
static void cciss_geometry_inquiry(int ctlr, int logvol,
			int withirq, unsigned int total_size,
			unsigned int block_size, InquiryData_struct *inq_buff,
			drive_info_struct *drv)
{
	int return_code;
	memset(inq_buff, 0, sizeof(InquiryData_struct));
	if (withirq)
		return_code = sendcmd_withirq(CISS_INQUIRY, ctlr,
			inq_buff, sizeof(*inq_buff), 1, logvol ,0xC1, TYPE_CMD);
	else
		return_code = sendcmd(CISS_INQUIRY, ctlr, inq_buff,
			sizeof(*inq_buff), 1, logvol ,0xC1, NULL, TYPE_CMD);
	if (return_code == IO_OK) {
		if(inq_buff->data_byte[8] == 0xFF) {
			printk(KERN_WARNING
				"cciss: reading geometry failed, volume "
				"does not support reading geometry\n");
			drv->block_size = block_size;
			drv->nr_blocks = total_size;
			drv->heads = 255;
			drv->sectors = 32; // Sectors per track
			drv->cylinders = total_size / 255 / 32;
		} else {
			unsigned int t;

			drv->block_size = block_size;
			drv->nr_blocks = total_size;
			drv->heads = inq_buff->data_byte[6];
			drv->sectors = inq_buff->data_byte[7];
			drv->cylinders = (inq_buff->data_byte[4] & 0xff) << 8;
			drv->cylinders += inq_buff->data_byte[5];
			drv->raid_level = inq_buff->data_byte[8];
			t = drv->heads * drv->sectors;
			if (t > 1) {
				drv->cylinders = total_size/t;
			}
		}
	} else { /* Get geometry failed */
		printk(KERN_WARNING "cciss: reading geometry failed\n");
	}
	printk(KERN_INFO "      heads= %d, sectors= %d, cylinders= %d\n\n",
		drv->heads, drv->sectors, drv->cylinders);
}
static void
cciss_read_capacity(int ctlr, int logvol, ReadCapdata_struct *buf,
		int withirq, unsigned int *total_size, unsigned int *block_size)
{
	int return_code;
	memset(buf, 0, sizeof(*buf));
	if (withirq)
		return_code = sendcmd_withirq(CCISS_READ_CAPACITY,
			ctlr, buf, sizeof(*buf), 1, logvol, 0, TYPE_CMD);
	else
		return_code = sendcmd(CCISS_READ_CAPACITY,
			ctlr, buf, sizeof(*buf), 1, logvol, 0, NULL, TYPE_CMD);
	if (return_code == IO_OK) {
		*total_size = be32_to_cpu(*((__be32 *) &buf->total_size[0]))+1;
		*block_size = be32_to_cpu(*((__be32 *) &buf->block_size[0]));
	} else { /* read capacity command failed */
		printk(KERN_WARNING "cciss: read capacity failed\n");
		*total_size = 0;
		*block_size = BLOCK_SIZE;
	}
	printk(KERN_INFO "      blocks= %u block_size= %d\n",
		*total_size, *block_size);
	return;
}

static int register_new_disk(ctlr_info_t *h)
{
        struct gendisk *disk;
	int ctlr = h->ctlr;
        int i;
	int num_luns;
	int logvol;
	int new_lun_found = 0;
	int new_lun_index = 0;
	int free_index_found = 0;
	int free_index = 0;
	ReportLunData_struct *ld_buff = NULL;
	ReadCapdata_struct *size_buff = NULL;
	InquiryData_struct *inq_buff = NULL;
	int return_code;
	int listlength = 0;
	__u32 lunid = 0;
	unsigned int block_size;
	unsigned int total_size;

        if (!capable(CAP_SYS_RAWIO))
                return -EPERM;
	/* if we have no space in our disk array left to add anything */
	if(  h->num_luns >= CISS_MAX_LUN)
		return -EINVAL;
	
	ld_buff = kmalloc(sizeof(ReportLunData_struct), GFP_KERNEL);
	if (ld_buff == NULL)
		goto mem_msg;
	memset(ld_buff, 0, sizeof(ReportLunData_struct));
	size_buff = kmalloc(sizeof( ReadCapdata_struct), GFP_KERNEL);
        if (size_buff == NULL)
		goto mem_msg;
	inq_buff = kmalloc(sizeof( InquiryData_struct), GFP_KERNEL);
        if (inq_buff == NULL)
		goto mem_msg;
	
	return_code = sendcmd_withirq(CISS_REPORT_LOG, ctlr, ld_buff, 
			sizeof(ReportLunData_struct), 0, 0, 0, TYPE_CMD);

	if( return_code == IO_OK)
	{
		
		// printk("LUN Data\n--------------------------\n");

		listlength |= (0xff & (unsigned int)(ld_buff->LUNListLength[0])) << 24;
		listlength |= (0xff & (unsigned int)(ld_buff->LUNListLength[1])) << 16;
		listlength |= (0xff & (unsigned int)(ld_buff->LUNListLength[2])) << 8;	
		listlength |= 0xff & (unsigned int)(ld_buff->LUNListLength[3]);
	} else /* reading number of logical volumes failed */
	{
		printk(KERN_WARNING "cciss: report logical volume"
			" command failed\n");
		listlength = 0;
		goto free_err;
	}
	num_luns = listlength / 8; // 8 bytes pre entry
	if (num_luns > CISS_MAX_LUN)
	{
		num_luns = CISS_MAX_LUN;
	}
#ifdef CCISS_DEBUG
	printk(KERN_DEBUG "Length = %x %x %x %x = %d\n", ld_buff->LUNListLength[0],
		ld_buff->LUNListLength[1], ld_buff->LUNListLength[2],
		ld_buff->LUNListLength[3],  num_luns);
#endif 
	for(i=0; i<  num_luns; i++)
	{
		int j;
		int lunID_found = 0;

	  	lunid = (0xff & (unsigned int)(ld_buff->LUN[i][3])) << 24;
        	lunid |= (0xff & (unsigned int)(ld_buff->LUN[i][2])) << 16;
        	lunid |= (0xff & (unsigned int)(ld_buff->LUN[i][1])) << 8;
        	lunid |= 0xff & (unsigned int)(ld_buff->LUN[i][0]);
		
 		/* check to see if this is a new lun */ 
		for(j=0; j <= h->highest_lun; j++)
		{
#ifdef CCISS_DEBUG
			printk("Checking %d %x against %x\n", j,h->drv[j].LunID,
						lunid);
#endif /* CCISS_DEBUG */
			if (h->drv[j].LunID == lunid)
			{
				lunID_found = 1;
				break;
			}
			
		}
		if( lunID_found == 1)
			continue;
		else
		{	/* It is the new lun we have been looking for */
#ifdef CCISS_DEBUG
			printk("new lun found at %d\n", i);
#endif /* CCISS_DEBUG */
			new_lun_index = i;
			new_lun_found = 1;
			break;	
		}
	 }
	 if (!new_lun_found)
	 {
		printk(KERN_WARNING "cciss:  New Logical Volume not found\n");
		goto free_err;
	 }
	 /* Now find the free index 	*/
	for(i=0; i <CISS_MAX_LUN; i++)
	{
#ifdef CCISS_DEBUG
		printk("Checking Index %d\n", i);
#endif /* CCISS_DEBUG */
		if(h->drv[i].LunID == 0)
		{
#ifdef CCISS_DEBUG
			printk("free index found at %d\n", i);
#endif /* CCISS_DEBUG */
			free_index_found = 1;
			free_index = i;
			break;
		}
	}
	if (!free_index_found)
	{
		printk(KERN_WARNING "cciss: unable to find free slot for disk\n");
		goto free_err;
         }

	logvol = free_index;
	h->drv[logvol].LunID = lunid;
		/* there could be gaps in lun numbers, track hightest */
	if(h->highest_lun < lunid)
		h->highest_lun = logvol;
	cciss_read_capacity(ctlr, logvol, size_buff, 1,
		&total_size, &block_size);
	cciss_geometry_inquiry(ctlr, logvol, 1, total_size, block_size,
			inq_buff, &h->drv[logvol]);
	h->drv[logvol].usage_count = 0;
	++h->num_luns;
	/* setup partitions per disk */
        disk = h->gendisk[logvol];
	set_capacity(disk, h->drv[logvol].nr_blocks);
	/* if it's the controller it's already added */
	if(logvol)
		add_disk(disk);
freeret:
	kfree(ld_buff);
	kfree(size_buff);
	kfree(inq_buff);
	return (logvol);
mem_msg:
	printk(KERN_ERR "cciss: out of memory\n");
free_err:
	logvol = -1;
	goto freeret;
}

static int cciss_revalidate(struct gendisk *disk)
{
	ctlr_info_t *h = get_host(disk);
	drive_info_struct *drv = get_drv(disk);
	int logvol;
	int FOUND=0;
	unsigned int block_size;
	unsigned int total_size;
	ReadCapdata_struct *size_buff = NULL;
	InquiryData_struct *inq_buff = NULL;

	for(logvol=0; logvol < CISS_MAX_LUN; logvol++)
	{
		if(h->drv[logvol].LunID == drv->LunID) {
			FOUND=1;
			break;
		}
	}

	if (!FOUND) return 1;

	size_buff = kmalloc(sizeof( ReadCapdata_struct), GFP_KERNEL);
        if (size_buff == NULL)
        {
                printk(KERN_WARNING "cciss: out of memory\n");
                return 1;
        }
	inq_buff = kmalloc(sizeof( InquiryData_struct), GFP_KERNEL);
        if (inq_buff == NULL)
        {
                printk(KERN_WARNING "cciss: out of memory\n");
		kfree(size_buff);
                return 1;
        }

	cciss_read_capacity(h->ctlr, logvol, size_buff, 1, &total_size, &block_size);
	cciss_geometry_inquiry(h->ctlr, logvol, 1, total_size, block_size, inq_buff, drv);

	blk_queue_hardsect_size(drv->queue, drv->block_size);
	set_capacity(disk, drv->nr_blocks);

	kfree(size_buff);
	kfree(inq_buff);
	return 0;
}

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

	/* Wait (up to 20 seconds) for a command to complete */

	for (i = 20 * HZ; i > 0; i--) {
		done = hba[ctlr]->access.command_completed(hba[ctlr]);
		if (done == FIFO_EMPTY)
			schedule_timeout_uninterruptible(1);
		else
			return (done);
	}
	/* Invalid address to tell caller we ran out of time */
	return 1;
}
/*
 * Send a command to the controller, and wait for it to complete.  
 * Only used at init time. 
 */
static int sendcmd(
	__u8	cmd,
	int	ctlr,
	void	*buff,
	size_t	size,
	unsigned int use_unit_num, /* 0: address the controller,
				      1: address logical volume log_unit, 
				      2: periph device address is scsi3addr */
	unsigned int log_unit,
	__u8	page_code,
	unsigned char *scsi3addr,
	int cmd_type)
{
	CommandList_struct *c;
	int i;
	unsigned long complete;
	ctlr_info_t *info_p= hba[ctlr];
	u64bit buff_dma_handle;
	int status;

	if ((c = cmd_alloc(info_p, 1)) == NULL) {
		printk(KERN_WARNING "cciss: unable to get memory");
		return(IO_ERROR);
	}
	status = fill_cmd(c, cmd, ctlr, buff, size, use_unit_num,
		log_unit, page_code, scsi3addr, cmd_type);
	if (status != IO_OK) {
		cmd_free(info_p, c, 1);
		return status;
	}
resend_cmd1:
	/*
         * Disable interrupt
         */
#ifdef CCISS_DEBUG
	printk(KERN_DEBUG "cciss: turning intr off\n");
#endif /* CCISS_DEBUG */ 
        info_p->access.set_intr_mask(info_p, CCISS_INTR_OFF);
	
	/* Make sure there is room in the command FIFO */
        /* Actually it should be completely empty at this time. */
        for (i = 200000; i > 0; i--) 
	{
		/* if fifo isn't full go */
                if (!(info_p->access.fifo_full(info_p))) 
		{
			
                        break;
                }
                udelay(10);
                printk(KERN_WARNING "cciss cciss%d: SendCmd FIFO full,"
                        " waiting!\n", ctlr);
        }
        /*
         * Send the cmd
         */
        info_p->access.submit_command(info_p, c);
        complete = pollcomplete(ctlr);

#ifdef CCISS_DEBUG
	printk(KERN_DEBUG "cciss: command completed\n");
#endif /* CCISS_DEBUG */

	if (complete != 1) {
		if ( (complete & CISS_ERROR_BIT)
		     && (complete & ~CISS_ERROR_BIT) == c->busaddr)
		     {
			/* if data overrun or underun on Report command 
				ignore it 
			*/
			if (((c->Request.CDB[0] == CISS_REPORT_LOG) ||
			     (c->Request.CDB[0] == CISS_REPORT_PHYS) ||
			     (c->Request.CDB[0] == CISS_INQUIRY)) &&
				((c->err_info->CommandStatus == 
					CMD_DATA_OVERRUN) || 
				 (c->err_info->CommandStatus == 
					CMD_DATA_UNDERRUN)
			 	))
			{
				complete = c->busaddr;
			} else {
				if (c->err_info->CommandStatus ==
						CMD_UNSOLICITED_ABORT) {
					printk(KERN_WARNING "cciss%d: "
						"unsolicited abort %p\n",
						ctlr, c);
					if (c->retry_count < MAX_CMD_RETRIES) {
						printk(KERN_WARNING
						   "cciss%d: retrying %p\n",
						   ctlr, c);
						c->retry_count++;
						/* erase the old error */
						/* information */
						memset(c->err_info, 0,
						   sizeof(ErrorInfo_struct));
						goto resend_cmd1;
					} else {
						printk(KERN_WARNING
						   "cciss%d: retried %p too "
						   "many times\n", ctlr, c);
						status = IO_ERROR;
						goto cleanup1;
					}
				}
				printk(KERN_WARNING "ciss ciss%d: sendcmd"
				" Error %x \n", ctlr, 
					c->err_info->CommandStatus); 
				printk(KERN_WARNING "ciss ciss%d: sendcmd"
				" offensive info\n"
				"  size %x\n   num %x   value %x\n", ctlr,
				  c->err_info->MoreErrInfo.Invalid_Cmd.offense_size,
				  c->err_info->MoreErrInfo.Invalid_Cmd.offense_num,
				  c->err_info->MoreErrInfo.Invalid_Cmd.offense_value);
				status = IO_ERROR;
				goto cleanup1;
			}
		}
                if (complete != c->busaddr) {
                        printk( KERN_WARNING "cciss cciss%d: SendCmd "
                      "Invalid command list address returned! (%lx)\n",
                                ctlr, complete);
			status = IO_ERROR;
			goto cleanup1;
                }
        } else {
                printk( KERN_WARNING
                        "cciss cciss%d: SendCmd Timeout out, "
                        "No command list address returned!\n",
                        ctlr);
		status = IO_ERROR;
        }
		
cleanup1:	
	/* unlock the data buffer from DMA */
	pci_unmap_single(info_p->pdev, (dma_addr_t) buff_dma_handle.val,
				size, PCI_DMA_BIDIRECTIONAL);
	cmd_free(info_p, c, 1);
	return (status);
} 
/*
 * 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;
}

/* 
 * Takes jobs of the Q and sends them to the hardware, then puts it on 
 * the Q to wait for completion. 
 */ 
static void start_io( ctlr_info_t *h)
{
	CommandList_struct *c;
	
	while(( c = h->reqQ) != NULL )
	{
		/* can't do anything if fifo is full */
		if ((h->access.fifo_full(h))) {
			printk(KERN_WARNING "cciss: fifo full\n");
			break;
		}

		/* Get the frist entry from the Request Q */ 
		removeQ(&(h->reqQ), c);
		h->Qdepth--;
	
		/* Tell the controller execute command */ 
		h->access.submit_command(h, c);
		
		/* Put job onto the completed Q */ 
		addQ (&(h->cmpQ), c); 
	}
}

static inline void complete_buffers(struct bio *bio, int status)
{
	while (bio) {
		struct bio *xbh = bio->bi_next; 
		int nr_sectors = bio_sectors(bio);

		bio->bi_next = NULL; 
		blk_finished_io(len);
		bio_endio(bio, nr_sectors << 9, status ? 0 : -EIO);
		bio = xbh;
	}

} 
/* Assumes that CCISS_LOCK(h->ctlr) is held. */
/* Zeros out the error record and then resends the command back */
/* to the controller */
static inline void resend_cciss_cmd( ctlr_info_t *h, CommandList_struct *c)
{
	/* erase the old error information */
	memset(c->err_info, 0, sizeof(ErrorInfo_struct));

	/* add it to software queue and then send it to the controller */
	addQ(&(h->reqQ),c);
	h->Qdepth++;
	if(h->Qdepth > h->maxQsinceinit)
		h->maxQsinceinit = h->Qdepth;

	start_io(h);
}
/* checks the status of the job and calls complete buffers to mark all 
 * buffers for the completed job. 
 */ 
static inline void complete_command( ctlr_info_t *h, CommandList_struct *cmd,
		int timeout)
{
	int status = 1;
	int i;
	int retry_cmd = 0;
	u64bit temp64;
		
	if (timeout)
		status = 0; 

	if(cmd->err_info->CommandStatus != 0) 
	{ /* an error has occurred */ 
		switch(cmd->err_info->CommandStatus)
		{
			unsigned char sense_key;
			case CMD_TARGET_STATUS:
				status = 0;
			
				if( cmd->err_info->ScsiStatus == 0x02)
				{
					printk(KERN_WARNING "cciss: cmd %p "
                                        	"has CHECK CONDITION "
						" byte 2 = 0x%x\n", cmd,
						cmd->err_info->SenseInfo[2]
					);
					/* check the sense key */
					sense_key = 0xf & 
						cmd->err_info->SenseInfo[2];
					/* no status or recovered error */
					if((sense_key == 0x0) ||
					    (sense_key == 0x1))
					{
							status = 1;
					}
				} else
				{
					printk(KERN_WARNING "cciss: cmd %p "
                                                "has SCSI Status 0x%x\n",
						cmd, cmd->err_info->ScsiStatus);
				}
			break;
			case CMD_DATA_UNDERRUN:
				printk(KERN_WARNING "cciss: cmd %p has"
					" completed with data underrun "
					"reported\n", cmd);
			break;
			case CMD_DATA_OVERRUN:
				printk(KERN_WARNING "cciss: cmd %p has"
					" completed with data overrun "
					"reported\n", cmd);
			break;
			case CMD_INVALID:
				printk(KERN_WARNING "cciss: cmd %p is "
					"reported invalid\n", cmd);
				status = 0;
			break;
			case CMD_PROTOCOL_ERR:
                                printk(KERN_WARNING "cciss: cmd %p has "
					"protocol error \n", cmd);
                                status = 0;
                        break;
			case CMD_HARDWARE_ERR:
                                printk(KERN_WARNING "cciss: cmd %p had " 
                                        " hardware error\n", cmd);
                                status = 0;
                        break;
			case CMD_CONNECTION_LOST:
				printk(KERN_WARNING "cciss: cmd %p had "
					"connection lost\n", cmd);
				status=0;
			break;
			case CMD_ABORTED:
				printk(KERN_WARNING "cciss: cmd %p was "
					"aborted\n", cmd);
				status=0;
			break;
			case CMD_ABORT_FAILED:
				printk(KERN_WARNING "cciss: cmd %p reports "
					"abort failed\n", cmd);
				status=0;
			break;
			case CMD_UNSOLICITED_ABORT:
				printk(KERN_WARNING "cciss%d: unsolicited "
					"abort %p\n", h->ctlr, cmd);
				if (cmd->retry_count < MAX_CMD_RETRIES) {
					retry_cmd=1;
					printk(KERN_WARNING
						"cciss%d: retrying %p\n",
						h->ctlr, cmd);
					cmd->retry_count++;
				} else
					printk(KERN_WARNING
						"cciss%d: %p retried too "
						"many times\n", h->ctlr, cmd);
				status=0;
			break;
			case CMD_TIMEOUT:
				printk(KERN_WARNING "cciss: cmd %p timedout\n",
					cmd);
				status=0;
			break;
			default:
				printk(KERN_WARNING "cciss: cmd %p returned "
					"unknown status %x\n", cmd, 
						cmd->err_info->CommandStatus); 
				status=0;
		}
	}
	/* We need to return this command */
	if(retry_cmd) {
		resend_cciss_cmd(h,cmd);
		return;
	}	
	/* command did not need to be retried */
	/* unmap the DMA mapping for all the scatter gather elements */
	for(i=0; i<cmd->Header.SGList; i++) {
		temp64.val32.lower = cmd->SG[i].Addr.lower;
		temp64.val32.upper = cmd->SG[i].Addr.upper;
		pci_unmap_page(hba[cmd->ctlr]->pdev,
			temp64.val, cmd->SG[i].Len,
			(cmd->Request.Type.Direction == XFER_READ) ?
				PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE);
	}
	complete_buffers(cmd->rq->bio, status);

#ifdef CCISS_DEBUG
	printk("Done with %p\n", cmd->rq);
#endif /* CCISS_DEBUG */ 

	end_that_request_last(cmd->rq);
	cmd_free(h,cmd,1);
}

/* 
 * Get a request and submit it to the controller. 
 */
static void do_cciss_request(request_queue_t *q)
{
	ctlr_info_t *h= q->queuedata; 
	CommandList_struct *c;
	int start_blk, seg;
	struct request *creq;
	u64bit temp64;
	struct scatterlist tmp_sg[MAXSGENTRIES];
	drive_info_struct *drv;
	int i, dir;

	/* We call start_io here in case there is a command waiting on the
	 * queue that has not been sent.
	*/
	if (blk_queue_plugged(q))
		goto startio;

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

	if (creq->nr_phys_segments > MAXSGENTRIES)
                BUG();

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

	blkdev_dequeue_request(creq);

	spin_unlock_irq(q->queue_lock);

	c->cmd_type = CMD_RWREQ;
	c->rq = creq;
	
	/* fill in the request */ 
	drv = creq->rq_disk->private_data;
	c->Header.ReplyQueue = 0;  // unused in simple mode
	c->Header.Tag.lower = c->busaddr;  // use the physical address the cmd block for tag
	c->Header.LUN.LogDev.VolId= drv->LunID;
	c->Header.LUN.LogDev.Mode = 1;
	c->Request.CDBLen = 10; // 12 byte commands not in FW yet;
	c->Request.Type.Type =  TYPE_CMD; // It is a command. 
	c->Request.Type.Attribute = ATTR_SIMPLE; 
	c->Request.Type.Direction = 
		(rq_data_dir(creq) == READ) ? XFER_READ: XFER_WRITE; 
	c->Request.Timeout = 0; // Don't time out	
	c->Request.CDB[0] = (rq_data_dir(creq) == READ) ? CCISS_READ : CCISS_WRITE;
	start_blk = creq->sector;
#ifdef CCISS_DEBUG
	printk(KERN_DEBUG "ciss: sector =%d nr_sectors=%d\n",(int) creq->sector,
		(int) creq->nr_sectors);	
#endif /* CCISS_DEBUG */

	seg = blk_rq_map_sg(q, creq, tmp_sg);

	/* get the DMA records for the setup */ 
	if (c->Request.Type.Direction == XFER_READ)
		dir = PCI_DMA_FROMDEVICE;
	else
		dir = PCI_DMA_TODEVICE;

	for (i=0; i<seg; i++)
	{
		c->SG[i].Len = tmp_sg[i].length;
		temp64.val = (__u64) pci_map_page(h->pdev, tmp_sg[i].page,
			 		  tmp_sg[i].offset, tmp_sg[i].length,
					  dir);
		c->SG[i].Addr.lower = temp64.val32.lower;
                c->SG[i].Addr.upper = temp64.val32.upper;
                c->SG[i].Ext = 0;  // we are not chaining
	}
	/* track how many SG entries we are using */ 
	if( seg > h->maxSG)
		h->maxSG = seg; 

#ifdef CCISS_DEBUG
	printk(KERN_DEBUG "cciss: Submitting %d sectors in %d segments\n", creq->nr_sectors, seg);
#endif /* CCISS_DEBUG */

	c->Header.SGList = c->Header.SGTotal = seg;
	c->Request.CDB[1]= 0;
	c->Request.CDB[2]= (start_blk >> 24) & 0xff;	//MSB
	c->Request.CDB[3]= (start_blk >> 16) & 0xff;
	c->Request.CDB[4]= (start_blk >>  8) & 0xff;
	c->Request.CDB[5]= start_blk & 0xff;
	c->Request.CDB[6]= 0; // (sect >> 24) & 0xff; MSB
	c->Request.CDB[7]= (creq->nr_sectors >>  8) & 0xff; 
	c->Request.CDB[8]= creq->nr_sectors & 0xff; 
	c->Request.CDB[9] = c->Request.CDB[11] = c->Request.CDB[12] = 0;

	spin_lock_irq(q->queue_lock);

	addQ(&(h->reqQ),c);
	h->Qdepth++;
	if(h->Qdepth > h->maxQsinceinit)
		h->maxQsinceinit = h->Qdepth; 

	goto queue;
full:
	blk_stop_queue(q);
startio:
	/* We will already have the driver lock here so not need
	 * to lock it.
	*/
	start_io(h);
}

static irqreturn_t do_cciss_intr(int irq, void *dev_id, struct pt_regs *regs)
{
	ctlr_info_t *h = dev_id;
	CommandList_struct *c;
	unsigned long flags;
	__u32 a, a1;
	int j;
	int start_queue = h->next_to_run;

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

	/*
	 * If there are completed commands in the completion queue,
	 * we had better do something about it.
	 */
	spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
	while( h->access.intr_pending(h))
	{
		while((a = h->access.command_completed(h)) != FIFO_EMPTY) 
		{
			a1 = a;
			a &= ~3;
			if ((c = h->cmpQ) == NULL)
			{  
				printk(KERN_WARNING "cciss: 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);
				if (c->cmd_type == CMD_RWREQ) {
					complete_command(h, c, 0);
				} else if (c->cmd_type == CMD_IOCTL_PEND) {
					complete(c->waiting);
				}
#				ifdef CONFIG_CISS_SCSI_TAPE
				else if (c->cmd_type == CMD_SCSI)
					complete_scsi_command(c, 0, a1);
#				endif
				continue;
			}
		}
	}

 	/* check to see if we have maxed out the number of commands that can
 	 * be placed on the queue.  If so then exit.  We do this check here
 	 * in case the interrupt we serviced was from an ioctl and did not
 	 * free any new commands.
	 */
 	if ((find_first_zero_bit(h->cmd_pool_bits, NR_CMDS)) == NR_CMDS)
 		goto cleanup;

 	/* We have room on the queue for more commands.  Now we need to queue
 	 * them up.  We will also keep track of the next queue to run so
 	 * that every queue gets a chance to be started first.
 	*/
	for (j=0; j < h->highest_lun + 1; j++){
		int curr_queue = (start_queue + j) % (h->highest_lun + 1);
 		/* make sure the disk has been added and the drive is real
 		 * because this can be called from the middle of init_one.
 		*/
		if(!(h->drv[curr_queue].queue) ||
		 		   !(h->drv[curr_queue].heads))
 			continue;
 		blk_start_queue(h->gendisk[curr_queue]->queue);

 		/* check to see if we have maxed out the number of commands
 		 * that can be placed on the queue.
 		*/
 		if ((find_first_zero_bit(h->cmd_pool_bits, NR_CMDS)) == NR_CMDS)
 		{
 			if (curr_queue == start_queue){
				h->next_to_run = (start_queue + 1) % (h->highest_lun + 1);
 				goto cleanup;
 			} else {
 				h->next_to_run = curr_queue;
 				goto cleanup;
 	}
 		} else {
			curr_queue = (curr_queue + 1) % (h->highest_lun + 1);
 		}
 	}

cleanup:
	spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
	return IRQ_HANDLED;
}
/* 
 *  We cannot read the structure directly, for portablity we must use 
 *   the io functions.
 *   This is for debug only. 
 */
#ifdef CCISS_DEBUG
static void print_cfg_table( CfgTable_struct *tb)
{
	int i;
	char temp_name[17];

	printk("Controller Configuration information\n");
	printk("------------------------------------\n");
	for(i=0;i<4;i++)
		temp_name[i] = readb(&(tb->Signature[i]));
	temp_name[4]='\0';
	printk("   Signature = %s\n", temp_name); 
	printk("   Spec Number = %d\n", readl(&(tb->SpecValence)));
	printk("   Transport methods supported = 0x%x\n", 
				readl(&(tb-> TransportSupport)));
	printk("   Transport methods active = 0x%x\n", 
				readl(&(tb->TransportActive)));
	printk("   Requested transport Method = 0x%x\n", 
			readl(&(tb->HostWrite.TransportRequest)));
	printk("   Coalese Interrupt Delay = 0x%x\n", 
			readl(&(tb->HostWrite.CoalIntDelay)));
	printk("   Coalese Interrupt Count = 0x%x\n", 
			readl(&(tb->HostWrite.CoalIntCount)));
	printk("   Max outstanding commands = 0x%d\n", 
			readl(&(tb->CmdsOutMax)));
	printk("   Bus Types = 0x%x\n", readl(&(tb-> BusTypes)));
	for(i=0;i<16;i++)
		temp_name[i] = readb(&(tb->ServerName[i]));
	temp_name[16] = '\0';
	printk("   Server Name = %s\n", temp_name);
	printk("   Heartbeat Counter = 0x%x\n\n\n", 
			readl(&(tb->HeartBeat)));
}
#endif /* CCISS_DEBUG */ 

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 int find_PCI_BAR_index(struct pci_dev *pdev,
				unsigned long pci_bar_addr)
{
	int i, offset, mem_type, bar_type;
	if (pci_bar_addr == PCI_BASE_ADDRESS_0) /* looking for BAR zero? */
		return 0;
	offset = 0;
	for (i=0; i<DEVICE_COUNT_RESOURCE; i++) {
		bar_type = pci_resource_flags(pdev, i) &
			PCI_BASE_ADDRESS_SPACE;
		if (bar_type == PCI_BASE_ADDRESS_SPACE_IO)
			offset += 4;
		else {
			mem_type = pci_resource_flags(pdev, i) &
				PCI_BASE_ADDRESS_MEM_TYPE_MASK;
			switch (mem_type) {
				case PCI_BASE_ADDRESS_MEM_TYPE_32:
				case PCI_BASE_ADDRESS_MEM_TYPE_1M:
					offset += 4; /* 32 bit */
					break;
				case PCI_BASE_ADDRESS_MEM_TYPE_64:
					offset += 8;
					break;
				default: /* reserved in PCI 2.2 */
					printk(KERN_WARNING "Base address is invalid\n");
			       		return -1;
				break;
			}
		}
 		if (offset == pci_bar_addr - PCI_BASE_ADDRESS_0)
			return i+1;
	}
	return -1;
}

static int cciss_pci_init(ctlr_info_t *c, struct pci_dev *pdev)
{
	ushort subsystem_vendor_id, subsystem_device_id, command;
	__u32 board_id, scratchpad = 0;
	__u64 cfg_offset;
	__u32 cfg_base_addr;
	__u64 cfg_base_addr_index;
	int i;

	/* check to see if controller has been disabled */
	/* BEFORE trying to enable it */
	(void) pci_read_config_word(pdev, PCI_COMMAND,&command);
	if(!(command & 0x02))
	{
		printk(KERN_WARNING "cciss: controller appears to be disabled\n");
		return(-1);
	}

	if (pci_enable_device(pdev))
	{
		printk(KERN_ERR "cciss: Unable to Enable PCI device\n");
		return( -1);
	}

	subsystem_vendor_id = pdev->subsystem_vendor;
	subsystem_device_id = pdev->subsystem_device;
	board_id = (((__u32) (subsystem_device_id << 16) & 0xffff0000) |
					subsystem_vendor_id);

	/* search for our IO range so we can protect it */
	for(i=0; i<DEVICE_COUNT_RESOURCE; i++)
	{
		/* is this an IO range */ 
		if( pci_resource_flags(pdev, i) & 0x01 ) {
			c->io_mem_addr = pci_resource_start(pdev, i);
			c->io_mem_length = pci_resource_end(pdev, i) -
				pci_resource_start(pdev, i) +1;
#ifdef CCISS_DEBUG
			printk("IO value found base_addr[%d] %lx %lx\n", i,
				c->io_mem_addr, c->io_mem_length);
#endif /* CCISS_DEBUG */
			/* register the IO range */ 
			if(!request_region( c->io_mem_addr,
                                        c->io_mem_length, "cciss"))
			{
				printk(KERN_WARNING "cciss 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;
		}
	}

#ifdef CCISS_DEBUG
	printk("command = %x\n", command);
	printk("irq = %x\n", pdev->irq);
	printk("board_id = %x\n", board_id);
#endif /* CCISS_DEBUG */ 

	c->intr = pdev->irq;

	/*
	 * Memory base addr is first addr , the second points to the config
         *   table
	 */

	c->paddr = pci_resource_start(pdev, 0); /* addressing mode bits already removed */
#ifdef CCISS_DEBUG
	printk("address 0 = %x\n", c->paddr);
#endif /* CCISS_DEBUG */ 
	c->vaddr = remap_pci_mem(c->paddr, 200);

	/* Wait for the board to become ready.  (PCI hotplug needs this.)
	 * We poll for up to 120 secs, once per 100ms. */
	for (i=0; i < 1200; i++) {
		scratchpad = readl(c->vaddr + SA5_SCRATCHPAD_OFFSET);
		if (scratchpad == CCISS_FIRMWARE_READY)
			break;
		set_current_state(TASK_INTERRUPTIBLE);
		schedule_timeout(HZ / 10); /* wait 100ms */
	}
	if (scratchpad != CCISS_FIRMWARE_READY) {
		printk(KERN_WARNING "cciss: Board not ready.  Timed out.\n");
		return -1;
	}

	/* get the address index number */
	cfg_base_addr = readl(c->vaddr + SA5_CTCFG_OFFSET);
	cfg_base_addr &= (__u32) 0x0000ffff;
#ifdef CCISS_DEBUG
	printk("cfg base address = %x\n", cfg_base_addr);
#endif /* CCISS_DEBUG */
	cfg_base_addr_index =
		find_PCI_BAR_index(pdev, cfg_base_addr);
#ifdef CCISS_DEBUG
	printk("cfg base address index = %x\n", cfg_base_addr_index);
#endif /* CCISS_DEBUG */
	if (cfg_base_addr_index == -1) {
		printk(KERN_WARNING "cciss: Cannot find cfg_base_addr_index\n");
		release_io_mem(c);
		return -1;
	}

	cfg_offset = readl(c->vaddr + SA5_CTMEM_OFFSET);
#ifdef CCISS_DEBUG
	printk("cfg offset = %x\n", cfg_offset);
#endif /* CCISS_DEBUG */
	c->cfgtable =  remap_pci_mem(pci_resource_start(pdev,
				cfg_base_addr_index) + cfg_offset,
				sizeof(CfgTable_struct));
	c->board_id = board_id;

#ifdef CCISS_DEBUG
	print_cfg_table(c->cfgtable); 
#endif /* CCISS_DEBUG */

	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 "cciss: Sorry, I don't know how"
			" to access the Smart Array controller %08lx\n", 
				(unsigned long)board_id);
		return -1;
	}
	if (  (readb(&c->cfgtable->Signature[0]) != 'C') ||
	      (readb(&c->cfgtable->Signature[1]) != 'I') ||
	      (readb(&c->cfgtable->Signature[2]) != 'S') ||
	      (readb(&c->cfgtable->Signature[3]) != 'S') )
	{
		printk("Does not appear to be a valid CISS config table\n");
		return -1;
	}

#ifdef CONFIG_X86
{
	/* Need to enable prefetch in the SCSI core for 6400 in x86 */
	__u32 prefetch;
	prefetch = readl(&(c->cfgtable->SCSI_Prefetch));
	prefetch |= 0x100;
	writel(prefetch, &(c->cfgtable->SCSI_Prefetch));
}
#endif

#ifdef CCISS_DEBUG
	printk("Trying to put board into Simple mode\n");
#endif /* CCISS_DEBUG */ 
	c->max_commands = readl(&(c->cfgtable->CmdsOutMax));
	/* Update the field, and then ring the doorbell */ 
	writel( CFGTBL_Trans_Simple, 
		&(c->cfgtable->HostWrite.TransportRequest));
	writel( CFGTBL_ChangeReq, c->vaddr + SA5_DOORBELL);

	/* under certain very rare conditions, this can take awhile.
	 * (e.g.: hot replace a failed 144GB drive in a RAID 5 set right
	 * as we enter this code.) */
	for(i=0;i<MAX_CONFIG_WAIT;i++) {
		if (!(readl(c->vaddr + SA5_DOORBELL) & CFGTBL_ChangeReq))
			break;
		/* delay and try again */
		set_current_state(TASK_INTERRUPTIBLE);
		schedule_timeout(10);
	}	

#ifdef CCISS_DEBUG
	printk(KERN_DEBUG "I counter got to %d %x\n", i, readl(c->vaddr + SA5_DOORBELL));
#endif /* CCISS_DEBUG */
#ifdef CCISS_DEBUG
	print_cfg_table(c->cfgtable);	
#endif /* CCISS_DEBUG */ 

	if (!(readl(&(c->cfgtable->TransportActive)) & CFGTBL_Trans_Simple))
	{
		printk(KERN_WARNING "cciss: unable to get board into"
					" simple mode\n");
		return -1;
	}
	return 0;

}

/* 
 * Gets information about the local volumes attached to the controller. 
 */ 
static void cciss_getgeometry(int cntl_num)
{
	ReportLunData_struct *ld_buff;
	ReadCapdata_struct *size_buff;
	InquiryData_struct *inq_buff;
	int return_code;
	int i;
	int listlength = 0;
	__u32 lunid = 0;
	int block_size;
	int total_size; 

	ld_buff = kmalloc(sizeof(ReportLunData_struct), GFP_KERNEL);
	if (ld_buff == NULL)
	{
		printk(KERN_ERR "cciss: out of memory\n");
		return;
	}
	memset(ld_buff, 0, sizeof(ReportLunData_struct));
	size_buff = kmalloc(sizeof( ReadCapdata_struct), GFP_KERNEL);
        if (size_buff == NULL)
        {
                printk(KERN_ERR "cciss: out of memory\n");
		kfree(ld_buff);
                return;
        }
	inq_buff = kmalloc(sizeof( InquiryData_struct), GFP_KERNEL);
        if (inq_buff == NULL)
        {
                printk(KERN_ERR "cciss: out of memory\n");
                kfree(ld_buff);
		kfree(size_buff);
                return;
        }
	/* Get the firmware version */ 
	return_code = sendcmd(CISS_INQUIRY, cntl_num, inq_buff, 
		sizeof(InquiryData_struct), 0, 0 ,0, NULL, TYPE_CMD);
	if (return_code == IO_OK)
	{
		hba[cntl_num]->firm_ver[0] = inq_buff->data_byte[32];
		hba[cntl_num]->firm_ver[1] = inq_buff->data_byte[33];
		hba[cntl_num]->firm_ver[2] = inq_buff->data_byte[34];
		hba[cntl_num]->firm_ver[3] = inq_buff->data_byte[35];
	} else /* send command failed */
	{
		printk(KERN_WARNING "cciss: unable to determine firmware"
			" version of controller\n");
	}
	/* Get the number of logical volumes */ 
	return_code = sendcmd(CISS_REPORT_LOG, cntl_num, ld_buff, 
			sizeof(ReportLunData_struct), 0, 0, 0, NULL, TYPE_CMD);

	if( return_code == IO_OK)
	{
#ifdef CCISS_DEBUG
		printk("LUN Data\n--------------------------\n");
#endif /* CCISS_DEBUG */ 

		listlength |= (0xff & (unsigned int)(ld_buff->LUNListLength[0])) << 24;
		listlength |= (0xff & (unsigned int)(ld_buff->LUNListLength[1])) << 16;
		listlength |= (0xff & (unsigned int)(ld_buff->LUNListLength[2])) << 8;	
		listlength |= 0xff & (unsigned int)(ld_buff->LUNListLength[3]);
	} else /* reading number of logical volumes failed */
	{
		printk(KERN_WARNING "cciss: report logical volume"
			" command failed\n");
		listlength = 0;
	}
	hba[cntl_num]->num_luns = listlength / 8; // 8 bytes pre entry
	if (hba[cntl_num]->num_luns > CISS_MAX_LUN)
	{
		printk(KERN_ERR "ciss:  only %d number of logical volumes supported\n",
			CISS_MAX_LUN);
		hba[cntl_num]->num_luns = CISS_MAX_LUN;
	}
#ifdef CCISS_DEBUG
	printk(KERN_DEBUG "Length = %x %x %x %x = %d\n", ld_buff->LUNListLength[0],
		ld_buff->LUNListLength[1], ld_buff->LUNListLength[2],
		ld_buff->LUNListLength[3],  hba[cntl_num]->num_luns);
#endif /* CCISS_DEBUG */

	hba[cntl_num]->highest_lun = hba[cntl_num]->num_luns-1;
	for(i=0; i<  hba[cntl_num]->num_luns; i++)
	{

	  	lunid = (0xff & (unsigned int)(ld_buff->LUN[i][3])) << 24;
        	lunid |= (0xff & (unsigned int)(ld_buff->LUN[i][2])) << 16;
        	lunid |= (0xff & (unsigned int)(ld_buff->LUN[i][1])) << 8;
        	lunid |= 0xff & (unsigned int)(ld_buff->LUN[i][0]);
		
		hba[cntl_num]->drv[i].LunID = lunid;


#ifdef CCISS_DEBUG
	  	printk(KERN_DEBUG "LUN[%d]:  %x %x %x %x = %x\n", i, 
		ld_buff->LUN[i][0], ld_buff->LUN[i][1],ld_buff->LUN[i][2], 
		ld_buff->LUN[i][3], hba[cntl_num]->drv[i].LunID);
#endif /* CCISS_DEBUG */
		cciss_read_capacity(cntl_num, i, size_buff, 0,
			&total_size, &block_size);
		cciss_geometry_inquiry(cntl_num, i, 0, total_size, block_size,
			inq_buff, &hba[cntl_num]->drv[i]);
	}
	kfree(ld_buff);
	kfree(size_buff);
	kfree(inq_buff);
}	

/* Function to find the first free pointer into our hba[] array */
/* Returns -1 if no free entries are left.  */
static int alloc_cciss_hba(void)
{
	struct gendisk *disk[NWD];
	int i, n;
	for (n = 0; n < NWD; n++) {
		disk[n] = alloc_disk(1 << NWD_SHIFT);
		if (!disk[n])
			goto out;
	}

	for(i=0; i< MAX_CTLR; i++) {
		if (!hba[i]) {
			ctlr_info_t *p;
			p = kmalloc(sizeof(ctlr_info_t), GFP_KERNEL);
			if (!p)
				goto Enomem;
			memset(p, 0, sizeof(ctlr_info_t));
			for (n = 0; n < NWD; n++)
				p->gendisk[n] = disk[n];
			hba[i] = p;
			return i;
		}
	}
	printk(KERN_WARNING "cciss: This driver supports a maximum"
		" of %d controllers.\n", MAX_CTLR);
	goto out;
Enomem:
	printk(KERN_ERR "cciss: out of memory.\n");
out:
	while (n--)
		put_disk(disk[n]);
	return -1;
}

static void free_hba(int i)
{
	ctlr_info_t *p = hba[i];
	int n;

	hba[i] = NULL;
	for (n = 0; n < NWD; n++)
		put_disk(p->gendisk[n]);
	kfree(p);
}

/*
 *  This is it.  Find all the controllers and register them.  I really hate
 *  stealing all these major device numbers.
 *  returns the number of block devices registered.
 */
static int __devinit cciss_init_one(struct pci_dev *pdev,
	const struct pci_device_id *ent)
{
	request_queue_t *q;
	int i;
	int j;
	int rc;

	printk(KERN_DEBUG "cciss: 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_cciss_hba();
	if(i < 0)
		return (-1);
	if (cciss_pci_init(hba[i], pdev) != 0)
		goto clean1;

	sprintf(hba[i]->devname, "cciss%d", i);
	hba[i]->ctlr = i;
	hba[i]->pdev = pdev;

	/* configure PCI DMA stuff */
	if (!pci_set_dma_mask(pdev, DMA_64BIT_MASK))
		printk("cciss: using DAC cycles\n");
	else if (!pci_set_dma_mask(pdev, DMA_32BIT_MASK))
		printk("cciss: not using DAC cycles\n");
	else {
		printk("cciss: no suitable DMA available\n");
		goto clean1;
	}

	/*
	 * register with the major number, or get a dynamic major number
	 * by passing 0 as argument.  This is done for greater than
	 * 8 controller support.
	 */
	if (i < MAX_CTLR_ORIG)
		hba[i]->major = MAJOR_NR + i;
	rc = register_blkdev(hba[i]->major, hba[i]->devname);
	if(rc == -EBUSY || rc == -EINVAL) {
		printk(KERN_ERR
			"cciss:  Unable to get major number %d for %s "
			"on hba %d\n", hba[i]->major, hba[i]->devname, i);
		goto clean1;
	}
	else {
		if (i >= MAX_CTLR_ORIG)
			hba[i]->major = rc;
	}

	/* make sure the board interrupts are off */
	hba[i]->access.set_intr_mask(hba[i], CCISS_INTR_OFF);
	if( request_irq(hba[i]->intr, do_cciss_intr, 
		SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM, 
			hba[i]->devname, hba[i])) {
		printk(KERN_ERR "cciss: Unable to get irq %d for %s\n",
			hba[i]->intr, hba[i]->devname);
		goto clean2;
	}
	hba[i]->cmd_pool_bits = kmalloc(((NR_CMDS+BITS_PER_LONG-1)/BITS_PER_LONG)*sizeof(unsigned long), GFP_KERNEL);
	hba[i]->cmd_pool = (CommandList_struct *)pci_alloc_consistent(
		hba[i]->pdev, NR_CMDS * sizeof(CommandList_struct), 
		&(hba[i]->cmd_pool_dhandle));
	hba[i]->errinfo_pool = (ErrorInfo_struct *)pci_alloc_consistent(
		hba[i]->pdev, NR_CMDS * sizeof( ErrorInfo_struct), 
		&(hba[i]->errinfo_pool_dhandle));
	if((hba[i]->cmd_pool_bits == NULL) 
		|| (hba[i]->cmd_pool == NULL)
		|| (hba[i]->errinfo_pool == NULL)) {
                printk( KERN_ERR "cciss: out of memory");
		goto clean4;
	}

	spin_lock_init(&hba[i]->lock);

	/* Initialize the pdev driver private data. 
		have it point to hba[i].  */
	pci_set_drvdata(pdev, hba[i]);
	/* command and error info recs zeroed out before 
			they are used */
        memset(hba[i]->cmd_pool_bits, 0, ((NR_CMDS+BITS_PER_LONG-1)/BITS_PER_LONG)*sizeof(unsigned long));

#ifdef CCISS_DEBUG	
	printk(KERN_DEBUG "Scanning for drives on controller cciss%d\n",i);
#endif /* CCISS_DEBUG */

	cciss_getgeometry(i);

	cciss_scsi_setup(i);

	/* Turn the interrupts on so we can service requests */
	hba[i]->access.set_intr_mask(hba[i], CCISS_INTR_ON);

	cciss_procinit(i);

	for(j=0; j < NWD; j++) { /* mfm */
		drive_info_struct *drv = &(hba[i]->drv[j]);
		struct gendisk *disk = hba[i]->gendisk[j];

		q = blk_init_queue(do_cciss_request, &hba[i]->lock);
		if (!q) {
			printk(KERN_ERR
			   "cciss:  unable to allocate queue for disk %d\n",
			   j);
			break;
		}
		drv->queue = q;

		q->backing_dev_info.ra_pages = READ_AHEAD;
	blk_queue_bounce_limit(q, hba[i]->pdev->dma_mask);

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

	/* This is a limit in the driver and could be eliminated. */
	blk_queue_max_phys_segments(q, MAXSGENTRIES);

	blk_queue_max_sectors(q, 512);

		q->queuedata = hba[i];
		sprintf(disk->disk_name, "cciss/c%dd%d", i, j);
		sprintf(disk->devfs_name, "cciss/host%d/target%d", i, j);
		disk->major = hba[i]->major;
		disk->first_minor = j << NWD_SHIFT;
		disk->fops = &cciss_fops;
		disk->queue = q;
		disk->private_data = drv;
		/* we must register the controller even if no disks exist */
		/* this is for the online array utilities */
		if(!drv->heads && j)
			continue;
		blk_queue_hardsect_size(q, drv->block_size);
		set_capacity(disk, drv->nr_blocks);
		add_disk(disk);
	}

	return(1);

clean4:
	if(hba[i]->cmd_pool_bits)
               	kfree(hba[i]->cmd_pool_bits);
	if(hba[i]->cmd_pool)
		pci_free_consistent(hba[i]->pdev,
			NR_CMDS * sizeof(CommandList_struct),
			hba[i]->cmd_pool, hba[i]->cmd_pool_dhandle);
	if(hba[i]->errinfo_pool)
		pci_free_consistent(hba[i]->pdev,
			NR_CMDS * sizeof( ErrorInfo_struct),
			hba[i]->errinfo_pool,
			hba[i]->errinfo_pool_dhandle);
	free_irq(hba[i]->intr, hba[i]);
clean2:
	unregister_blkdev(hba[i]->major, hba[i]->devname);
clean1:
	release_io_mem(hba[i]);
	free_hba(i);
	return(-1);
}

static void __devexit cciss_remove_one (struct pci_dev *pdev)
{
	ctlr_info_t *tmp_ptr;
	int i, j;
	char flush_buf[4];
	int return_code; 

	if (pci_get_drvdata(pdev) == NULL)
	{
		printk( KERN_ERR "cciss: Unable to remove device \n");
		return;
	}
	tmp_ptr = pci_get_drvdata(pdev);
	i = tmp_ptr->ctlr;
	if (hba[i] == NULL) 
	{
		printk(KERN_ERR "cciss: device appears to "
			"already be removed \n");
		return;
	}
	/* Turn board interrupts off  and send the flush cache command */
	/* sendcmd will turn off interrupt, and send the flush...
	* To write all data in the battery backed cache to disks */
	memset(flush_buf, 0, 4);
	return_code = sendcmd(CCISS_CACHE_FLUSH, i, flush_buf, 4, 0, 0, 0, NULL,
				TYPE_CMD);
	if(return_code != IO_OK)
	{
		printk(KERN_WARNING "Error Flushing cache on controller %d\n", 
			i);
	}
	free_irq(hba[i]->intr, hba[i]);
	pci_set_drvdata(pdev, NULL);
	iounmap(hba[i]->vaddr);
	cciss_unregister_scsi(i);  /* unhook from SCSI subsystem */
	unregister_blkdev(hba[i]->major, hba[i]->devname);
	remove_proc_entry(hba[i]->devname, proc_cciss);	
	
	/* remove it from the disk list */
	for (j = 0; j < NWD; j++) {
		struct gendisk *disk = hba[i]->gendisk[j];
		if (disk->flags & GENHD_FL_UP)
			blk_cleanup_queue(disk->queue);
			del_gendisk(disk);
	}

	pci_free_consistent(hba[i]->pdev, NR_CMDS * sizeof(CommandList_struct),
			    hba[i]->cmd_pool, hba[i]->cmd_pool_dhandle);
	pci_free_consistent(hba[i]->pdev, NR_CMDS * sizeof( ErrorInfo_struct),
		hba[i]->errinfo_pool, hba[i]->errinfo_pool_dhandle);
	kfree(hba[i]->cmd_pool_bits);
 	release_io_mem(hba[i]);
	free_hba(i);
}	

static struct pci_driver cciss_pci_driver = {
	.name =		"cciss",
	.probe =	cciss_init_one,
	.remove =	__devexit_p(cciss_remove_one),
	.id_table =	cciss_pci_device_id, /* id_table */
};

/*
 *  This is it.  Register the PCI driver information for the cards we control
 *  the OS will call our registered routines when it finds one of our cards. 
 */
static int __init cciss_init(void)
{
	printk(KERN_INFO DRIVER_NAME "\n");

	/* Register for our PCI devices */
	return pci_module_init(&cciss_pci_driver);
}

static void __exit cciss_cleanup(void)
{
	int i;

	pci_unregister_driver(&cciss_pci_driver);
	/* double check that all controller entrys have been removed */
	for (i=0; i< MAX_CTLR; i++) 
	{
		if (hba[i] != NULL)
		{
			printk(KERN_WARNING "cciss: had to remove"
					" controller %d\n", i);
			cciss_remove_one(hba[i]->pdev);
		}
	}
	remove_proc_entry("cciss", proc_root_driver);
}

module_init(cciss_init);
module_exit(cciss_cleanup);