drivers/block/cciss.c



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/*
 *    Disk Array driver for HP SA 5xxx and 6xxx Controllers
 *    Copyright 2000, 2006 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/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 <linux/blktrace_api.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>
#include <scsi/scsi.h>
#include <scsi/sg.h>
#include <scsi/scsi_ioctl.h>
#include <linux/cdrom.h>

#define CCISS_DRIVER_VERSION(maj,min,submin) ((maj<<16)|(min<<8)|(submin))
#define DRIVER_NAME "HP CISS Driver (v 3.6.14)"
#define DRIVER_VERSION CCISS_DRIVER_VERSION(3,6,14)

/* Embedded module documentation macros - see modules.h */
MODULE_AUTHOR("Hewlett-Packard Company");
MODULE_DESCRIPTION("Driver for HP Controller SA5xxx SA6xxx version 3.6.14");
MODULE_SUPPORTED_DEVICE("HP SA5i SA5i+ SA532 SA5300 SA5312 SA641 SA642 SA6400"
			" SA6i P600 P800 P400 P400i E200 E200i E500");
MODULE_VERSION("3.6.14");
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},
	{PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSB, 0x0E11, 0x4080},
	{PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSB, 0x0E11, 0x4082},
	{PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSB, 0x0E11, 0x4083},
	{PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSC, 0x0E11, 0x4091},
	{PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSC, 0x0E11, 0x409A},
	{PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSC, 0x0E11, 0x409B},
	{PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSC, 0x0E11, 0x409C},
	{PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSC, 0x0E11, 0x409D},
	{PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSA,     0x103C, 0x3225},
	{PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSC,     0x103C, 0x3223},
	{PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSC,     0x103C, 0x3234},
	{PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSC,     0x103C, 0x3235},
	{PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSD,     0x103C, 0x3211},
	{PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSD,     0x103C, 0x3212},
	{PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSD,     0x103C, 0x3213},
	{PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSD,     0x103C, 0x3214},
	{PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSD,     0x103C, 0x3215},
	{PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSC,     0x103C, 0x3237},
	{PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSC,     0x103C, 0x323D},
	{PCI_VENDOR_ID_HP,     PCI_ANY_ID,	PCI_ANY_ID, PCI_ANY_ID,
		PCI_CLASS_STORAGE_RAID << 8, 0xffff << 8, 0},
	{0,}
};

MODULE_DEVICE_TABLE(pci, cciss_pci_device_id);

/*  board_id = Subsystem Device ID & Vendor ID
 *  product = Marketing Name for the board
 *  access = Address of the struct of function pointers
 *  nr_cmds = Number of commands supported by controller
 */
static struct board_type products[] = {
	{0x40700E11, "Smart Array 5300", &SA5_access, 512},
	{0x40800E11, "Smart Array 5i", &SA5B_access, 512},
	{0x40820E11, "Smart Array 532", &SA5B_access, 512},
	{0x40830E11, "Smart Array 5312", &SA5B_access, 512},
	{0x409A0E11, "Smart Array 641", &SA5_access, 512},
	{0x409B0E11, "Smart Array 642", &SA5_access, 512},
	{0x409C0E11, "Smart Array 6400", &SA5_access, 512},
	{0x409D0E11, "Smart Array 6400 EM", &SA5_access, 512},
	{0x40910E11, "Smart Array 6i", &SA5_access, 512},
	{0x3225103C, "Smart Array P600", &SA5_access, 512},
	{0x3223103C, "Smart Array P800", &SA5_access, 512},
	{0x3234103C, "Smart Array P400", &SA5_access, 512},
	{0x3235103C, "Smart Array P400i", &SA5_access, 512},
	{0x3211103C, "Smart Array E200i", &SA5_access, 120},
	{0x3212103C, "Smart Array E200", &SA5_access, 120},
	{0x3213103C, "Smart Array E200i", &SA5_access, 120},
	{0x3214103C, "Smart Array E200i", &SA5_access, 120},
	{0x3215103C, "Smart Array E200i", &SA5_access, 120},
	{0x3237103C, "Smart Array E500", &SA5_access, 512},
	{0x323D103C, "Smart Array P700m", &SA5_access, 512},
	{0xFFFF103C, "Unknown Smart Array", &SA5_access, 120},
};

/* How long to wait (in milliseconds) 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 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(struct request_queue *q);
static irqreturn_t do_cciss_intr(int irq, void *dev_id);
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 cciss_getgeo(struct block_device *bdev, struct hd_geometry *geo);

static int cciss_revalidate(struct gendisk *disk);
static int rebuild_lun_table(ctlr_info_t *h, struct gendisk *del_disk);
static int deregister_disk(struct gendisk *disk, drive_info_struct *drv,
			   int clear_all);

static void cciss_read_capacity(int ctlr, int logvol, int withirq,
			sector_t *total_size, unsigned int *block_size);
static void cciss_read_capacity_16(int ctlr, int logvol, int withirq,
			sector_t *total_size, unsigned int *block_size);
static void cciss_geometry_inquiry(int ctlr, int logvol,
			int withirq, sector_t total_size,
			unsigned int block_size, InquiryData_struct *inq_buff,
				   drive_info_struct *drv);
static void cciss_getgeometry(int cntl_num);
static void __devinit cciss_interrupt_mode(ctlr_info_t *, struct pci_dev *,
					   __u32);
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);
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);

static void fail_all_cmds(unsigned long ctlr);

#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,
	.getgeo = cciss_getgeo,
#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 */

#define RAID_UNKNOWN 6

#ifdef CONFIG_PROC_FS

/*
 * Report information about this controller.
 */
#define ENG_GIG 1000000000
#define ENG_GIG_FACTOR (ENG_GIG/512)
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"
		       "Max sectors: %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[SIMPLE_MODE_INT],
		       h->num_luns,
		       h->cciss_max_sectors,
		       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->heads == 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->cmdindex = -1;

		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, h->nr_cmds);
			if (i == h->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->cmdindex = i;
	}

	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 */

	if (host->busy_initializing || drv->busy_configuring)
		return -EBUSY;
	/*
	 * 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->heads == 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_path.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

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

	if (!drv->cylinders)
		return -ENXIO;

	geo->heads = drv->heads;
	geo->sectors = drv->sectors;
	geo->cylinders = drv->cylinders;
	return 0;
}

/*
 * 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 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:
		return rebuild_lun_table(host, NULL);

	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 rebuild_lun_table(host, disk);

	case CCISS_REGNEWD:
		return rebuild_lun_table(host, NULL);

	case CCISS_PASSTHRU:
		{
			IOCTL_Command_struct iocommand;
			CommandList_struct *c;
			char *buff = NULL;
			u64bit temp64;
			unsigned long flags;
			DECLARE_COMPLETION_ONSTACK(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_ONSTACK(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 =
			    kzalloc(MAXSGENTRIES * sizeof(char *), GFP_KERNEL);
			if (!buff) {
				status = -ENOMEM;
				goto cleanup1;
			}
			buff_size = 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) {
					if (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++)
					kfree(buff[i]);
				kfree(buff);
			}
			kfree(buff_size);
			kfree(ioc);
			return status;
		}

	/* scsi_cmd_ioctl handles these, below, though some are not */
	/* very meaningful for cciss.  SG_IO is the main one people want. */

	case SG_GET_VERSION_NUM:
	case SG_SET_TIMEOUT:
	case SG_GET_TIMEOUT:
	case SG_GET_RESERVED_SIZE:
	case SG_SET_RESERVED_SIZE:
	case SG_EMULATED_HOST:
	case SG_IO:
	case SCSI_IOCTL_SEND_COMMAND:
		return scsi_cmd_ioctl(filep, disk->queue, disk, cmd, argp);

	/* scsi_cmd_ioctl would normally handle these, below, but */
	/* they aren't a good fit for cciss, as CD-ROMs are */
	/* not supported, and we don't have any bus/target/lun */
	/* which we present to the kernel. */

	case CDROM_SEND_PACKET:
	case CDROMCLOSETRAY:
	case CDROMEJECT:
	case SCSI_IOCTL_GET_IDLUN:
	case SCSI_IOCTL_GET_BUS_NUMBER:
	default:
		return -ENOTTY;
	}
}

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

		bio->bi_next = NULL;
		bio_endio(bio, status ? 0 : -EIO);
		bio = xbh;
	}
}

static void cciss_check_queues(ctlr_info_t *h)
{
	int start_queue = h->next_to_run;
	int i;

	/* 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, h->nr_cmds)) == h->nr_cmds)
		return;

	/* 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 (i = 0; i < h->highest_lun + 1; i++) {
		int curr_queue = (start_queue + i) % (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, h->nr_cmds)) == h->nr_cmds) {
			if (curr_queue == start_queue) {
				h->next_to_run =
				    (start_queue + 1) % (h->highest_lun + 1);
				break;
			} else {
				h->next_to_run = curr_queue;
				break;
			}
		} else {
			curr_queue = (curr_queue + 1) % (h->highest_lun + 1);
		}
	}
}

static void cciss_softirq_done(struct request *rq)
{
	CommandList_struct *cmd = rq->completion_data;
	ctlr_info_t *h = hba[cmd->ctlr];
	unsigned long flags;
	u64bit temp64;
	int i, ddir;

	if (cmd->Request.Type.Direction == XFER_READ)
		ddir = PCI_DMA_FROMDEVICE;
	else
		ddir = PCI_DMA_TODEVICE;

	/* 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(h->pdev, temp64.val, cmd->SG[i].Len, ddir);
	}

	complete_buffers(rq->bio, (rq->errors == 0));

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

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

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

	add_disk_randomness(rq->rq_disk);
	spin_lock_irqsave(&h->lock, flags);
	end_that_request_last(rq, (rq->errors == 0));
	cmd_free(h, cmd, 1);
	cciss_check_queues(h);
	spin_unlock_irqrestore(&h->lock, flags);
}

/* This function will check the usage_count of the drive to be updated/added.
 * If the usage_count is zero then the drive information will be updated and
 * the disk will be re-registered with the kernel.  If not then it will be
 * left alone for the next reboot.  The exception to this is disk 0 which
 * will always be left registered with the kernel since it is also the
 * controller node.  Any changes to disk 0 will show up on the next
 * reboot.
 */
static void cciss_update_drive_info(int ctlr, int drv_index)
{
	ctlr_info_t *h = hba[ctlr];
	struct gendisk *disk;
	InquiryData_struct *inq_buff = NULL;
	unsigned int block_size;
	sector_t total_size;
	unsigned long flags = 0;
	int ret = 0;

	/* if the disk already exists then deregister it before proceeding */
	if (h->drv[drv_index].raid_level != -1) {
		spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
		h->drv[drv_index].busy_configuring = 1;
		spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
		ret = deregister_disk(h->gendisk[drv_index],
				      &h->drv[drv_index], 0);
		h->drv[drv_index].busy_configuring = 0;
	}

	/* If the disk is in use return */
	if (ret)
		return;

	/* Get information about the disk and modify the driver structure */
	inq_buff = kmalloc(sizeof(InquiryData_struct), GFP_KERNEL);
	if (inq_buff == NULL)
		goto mem_msg;

 	/* testing to see if 16-byte CDBs are already being used */
 	if (h->cciss_read == CCISS_READ_16) {
 		cciss_read_capacity_16(h->ctlr, drv_index, 1,
 			&total_size, &block_size);
 		goto geo_inq;
 	}

	cciss_read_capacity(ctlr, drv_index, 1,
			    &total_size, &block_size);

  	/* if read_capacity returns all F's this volume is >2TB in size */
  	/* so we switch to 16-byte CDB's for all read/write ops */
  	if (total_size == 0xFFFFFFFFULL) {
		cciss_read_capacity_16(ctlr, drv_index, 1,
		&total_size, &block_size);
		h->cciss_read = CCISS_READ_16;
		h->cciss_write = CCISS_WRITE_16;
	} else {
		h->cciss_read = CCISS_READ_10;
		h->cciss_write = CCISS_WRITE_10;
	}
geo_inq:
	cciss_geometry_inquiry(ctlr, drv_index, 1, total_size, block_size,
			       inq_buff, &h->drv[drv_index]);

	++h->num_luns;
	disk = h->gendisk[drv_index];
	set_capacity(disk, h->drv[drv_index].nr_blocks);

	/* if it's the controller it's already added */
	if (drv_index) {
		disk->queue = blk_init_queue(do_cciss_request, &h->lock);
		sprintf(disk->disk_name, "cciss/c%dd%d", ctlr, drv_index);
		disk->major = h->major;
		disk->first_minor = drv_index << NWD_SHIFT;
		disk->fops = &cciss_fops;
		disk->private_data = &h->drv[drv_index];

		/* Set up queue information */
		disk->queue->backing_dev_info.ra_pages = READ_AHEAD;
		blk_queue_bounce_limit(disk->queue, hba[ctlr]->pdev->dma_mask);

		/* This is a hardware imposed limit. */
		blk_queue_max_hw_segments(disk->queue, MAXSGENTRIES);

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

		blk_queue_max_sectors(disk->queue, h->cciss_max_sectors);

		blk_queue_softirq_done(disk->queue, cciss_softirq_done);

		disk->queue->queuedata = hba[ctlr];

		blk_queue_hardsect_size(disk->queue,
					hba[ctlr]->drv[drv_index].block_size);

		h->drv[drv_index].queue = disk->queue;
		add_disk(disk);
	}

      freeret:
	kfree(inq_buff);
	return;
      mem_msg:
	printk(KERN_ERR "cciss: out of memory\n");
	goto freeret;
}

/* This function will find the first index of the controllers drive array
 * that has a -1 for the raid_level and will return that index.  This is
 * where new drives will be added.  If the index to be returned is greater
 * than the highest_lun index for the controller then highest_lun is set
 * to this new index.  If there are no available indexes then -1 is returned.
 */
static int cciss_find_free_drive_index(int ctlr)
{
	int i;

	for (i = 0; i < CISS_MAX_LUN; i++) {
		if (hba[ctlr]->drv[i].raid_level == -1) {
			if (i > hba[ctlr]->highest_lun)
				hba[ctlr]->highest_lun = i;
			return i;
		}
	}
	return -1;
}

/* This function will add and remove logical drives from the Logical
 * drive array of the controller and maintain persistency of ordering
 * so that mount points are preserved until the next reboot.  This allows
 * for the removal of logical drives in the middle of the drive array
 * without a re-ordering of those drives.
 * INPUT
 * h		= The controller to perform the operations on
 * del_disk	= The disk to remove if specified.  If the value given
 *		  is NULL then no disk is removed.
 */
static int rebuild_lun_table(ctlr_info_t *h, struct gendisk *del_disk)
{
	int ctlr = h->ctlr;
	int num_luns;
	ReportLunData_struct *ld_buff = NULL;
	drive_info_struct *drv = NULL;
	int return_code;
	int listlength = 0;
	int i;
	int drv_found;
	int drv_index = 0;
	__u32 lunid = 0;
	unsigned long flags;

	/* Set busy_configuring flag for this operation */
	spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
	if (h->busy_configuring) {
		spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
		return -EBUSY;
	}
	h->busy_configuring = 1;

	/* if del_disk is NULL then we are being called to add a new disk
	 * and update the logical drive table.  If it is not NULL then