/*
   *    Disk Array driver for HP Smart Array SAS controllers
   *    Copyright 2000, 2009 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; version 2 of the License.
   *
   *    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/fs.h>
  #include <linux/timer.h>
  #include <linux/seq_file.h>
  #include <linux/init.h>
  #include <linux/spinlock.h>
  #include <linux/smp_lock.h>
  #include <linux/compat.h>
  #include <linux/blktrace_api.h>
  #include <linux/uaccess.h>
  #include <linux/io.h>
  #include <linux/dma-mapping.h>
  #include <linux/completion.h>
  #include <linux/moduleparam.h>
  #include <scsi/scsi.h>
  #include <scsi/scsi_cmnd.h>
  #include <scsi/scsi_device.h>
  #include <scsi/scsi_host.h>

  #include <scsi/scsi_tcq.h>

  #include <linux/cciss_ioctl.h>
  #include <linux/string.h>
  #include <linux/bitmap.h>
  #include <asm/atomic.h>
  #include <linux/kthread.h>
  #include "hpsa_cmd.h"
  #include "hpsa.h"
  
  /* HPSA_DRIVER_VERSION must be 3 byte values (0-255) separated by '.' */

  #define HPSA_DRIVER_VERSION "2.0.2-1"

  #define DRIVER_NAME "HP HPSA Driver (v " HPSA_DRIVER_VERSION ")"
  
  /* 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
  
  /* Embedded module documentation macros - see modules.h */
  MODULE_AUTHOR("Hewlett-Packard Company");
  MODULE_DESCRIPTION("Driver for HP Smart Array Controller version " \
  	HPSA_DRIVER_VERSION);
  MODULE_SUPPORTED_DEVICE("HP Smart Array Controllers");
  MODULE_VERSION(HPSA_DRIVER_VERSION);
  MODULE_LICENSE("GPL");
  
  static int hpsa_allow_any;
  module_param(hpsa_allow_any, int, S_IRUGO|S_IWUSR);
  MODULE_PARM_DESC(hpsa_allow_any,
  		"Allow hpsa driver to access unknown HP Smart Array hardware");
  
  /* define the PCI info for the cards we can control */
  static const struct pci_device_id hpsa_pci_device_id[] = {

  	{PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3241},
  	{PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3243},
  	{PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3245},
  	{PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3247},
  	{PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3249},
  	{PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x324a},
  	{PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x324b},

  	{PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3233},
  #define PCI_DEVICE_ID_HP_CISSF 0x333f
  	{PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSF,     0x103C, 0x333F},

  	{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, hpsa_pci_device_id);
  
  /*  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[] = {

  	{0x3241103C, "Smart Array P212", &SA5_access},
  	{0x3243103C, "Smart Array P410", &SA5_access},
  	{0x3245103C, "Smart Array P410i", &SA5_access},
  	{0x3247103C, "Smart Array P411", &SA5_access},
  	{0x3249103C, "Smart Array P812", &SA5_access},
  	{0x324a103C, "Smart Array P712m", &SA5_access},
  	{0x324b103C, "Smart Array P711m", &SA5_access},

  	{0x3233103C, "StorageWorks P1210m", &SA5_access},
  	{0x333F103C, "StorageWorks P1210m", &SA5_access},

  	{0xFFFF103C, "Unknown Smart Array", &SA5_access},
  };
  
  static int number_of_controllers;
  
  static irqreturn_t do_hpsa_intr(int irq, void *dev_id);
  static int hpsa_ioctl(struct scsi_device *dev, int cmd, void *arg);
  static void start_io(struct ctlr_info *h);
  
  #ifdef CONFIG_COMPAT
  static int hpsa_compat_ioctl(struct scsi_device *dev, int cmd, void *arg);
  #endif
  
  static void cmd_free(struct ctlr_info *h, struct CommandList *c);
  static void cmd_special_free(struct ctlr_info *h, struct CommandList *c);
  static struct CommandList *cmd_alloc(struct ctlr_info *h);
  static struct CommandList *cmd_special_alloc(struct ctlr_info *h);

  static void fill_cmd(struct CommandList *c, u8 cmd, struct ctlr_info *h,
  	void *buff, size_t size, u8 page_code, unsigned char *scsi3addr,

  	int cmd_type);
  
  static int hpsa_scsi_queue_command(struct scsi_cmnd *cmd,
  		void (*done)(struct scsi_cmnd *));

  static void hpsa_scan_start(struct Scsi_Host *);
  static int hpsa_scan_finished(struct Scsi_Host *sh,
  	unsigned long elapsed_time);

  static int hpsa_change_queue_depth(struct scsi_device *sdev,
  	int qdepth, int reason);

  
  static int hpsa_eh_device_reset_handler(struct scsi_cmnd *scsicmd);
  static int hpsa_slave_alloc(struct scsi_device *sdev);
  static void hpsa_slave_destroy(struct scsi_device *sdev);
  
  static ssize_t raid_level_show(struct device *dev,
  	struct device_attribute *attr, char *buf);
  static ssize_t lunid_show(struct device *dev,
  	struct device_attribute *attr, char *buf);
  static ssize_t unique_id_show(struct device *dev,
  	struct device_attribute *attr, char *buf);
  static void hpsa_update_scsi_devices(struct ctlr_info *h, int hostno);
  static ssize_t host_store_rescan(struct device *dev,
  	 struct device_attribute *attr, const char *buf, size_t count);
  static int check_for_unit_attention(struct ctlr_info *h,
  	struct CommandList *c);
  static void check_ioctl_unit_attention(struct ctlr_info *h,
  	struct CommandList *c);

  /* performant mode helper functions */
  static void calc_bucket_map(int *bucket, int num_buckets,
  	int nsgs, int *bucket_map);
  static void hpsa_put_ctlr_into_performant_mode(struct ctlr_info *h);
  static inline u32 next_command(struct ctlr_info *h);

  
  static DEVICE_ATTR(raid_level, S_IRUGO, raid_level_show, NULL);
  static DEVICE_ATTR(lunid, S_IRUGO, lunid_show, NULL);
  static DEVICE_ATTR(unique_id, S_IRUGO, unique_id_show, NULL);
  static DEVICE_ATTR(rescan, S_IWUSR, NULL, host_store_rescan);
  
  static struct device_attribute *hpsa_sdev_attrs[] = {
  	&dev_attr_raid_level,
  	&dev_attr_lunid,
  	&dev_attr_unique_id,
  	NULL,
  };
  
  static struct device_attribute *hpsa_shost_attrs[] = {
  	&dev_attr_rescan,
  	NULL,
  };
  
  static struct scsi_host_template hpsa_driver_template = {
  	.module			= THIS_MODULE,
  	.name			= "hpsa",
  	.proc_name		= "hpsa",
  	.queuecommand		= hpsa_scsi_queue_command,

  	.scan_start		= hpsa_scan_start,
  	.scan_finished		= hpsa_scan_finished,

  	.change_queue_depth	= hpsa_change_queue_depth,

  	.this_id		= -1,

  	.use_clustering		= ENABLE_CLUSTERING,
  	.eh_device_reset_handler = hpsa_eh_device_reset_handler,
  	.ioctl			= hpsa_ioctl,
  	.slave_alloc		= hpsa_slave_alloc,
  	.slave_destroy		= hpsa_slave_destroy,
  #ifdef CONFIG_COMPAT
  	.compat_ioctl		= hpsa_compat_ioctl,
  #endif
  	.sdev_attrs = hpsa_sdev_attrs,
  	.shost_attrs = hpsa_shost_attrs,
  };
  
  static inline struct ctlr_info *sdev_to_hba(struct scsi_device *sdev)
  {
  	unsigned long *priv = shost_priv(sdev->host);
  	return (struct ctlr_info *) *priv;
  }

  static inline struct ctlr_info *shost_to_hba(struct Scsi_Host *sh)
  {
  	unsigned long *priv = shost_priv(sh);
  	return (struct ctlr_info *) *priv;
  }

  static int check_for_unit_attention(struct ctlr_info *h,
  	struct CommandList *c)
  {
  	if (c->err_info->SenseInfo[2] != UNIT_ATTENTION)
  		return 0;
  
  	switch (c->err_info->SenseInfo[12]) {
  	case STATE_CHANGED:
  		dev_warn(&h->pdev->dev, "hpsa%d: a state change "
  			"detected, command retried
  ", h->ctlr);
  		break;
  	case LUN_FAILED:
  		dev_warn(&h->pdev->dev, "hpsa%d: LUN failure "
  			"detected, action required
  ", h->ctlr);
  		break;
  	case REPORT_LUNS_CHANGED:
  		dev_warn(&h->pdev->dev, "hpsa%d: report LUN data "

  			"changed, action required
  ", h->ctlr);

  	/*

  	 * Note: this REPORT_LUNS_CHANGED condition only occurs on the MSA2012.
  	 */
  		break;
  	case POWER_OR_RESET:
  		dev_warn(&h->pdev->dev, "hpsa%d: a power on "
  			"or device reset detected
  ", h->ctlr);
  		break;
  	case UNIT_ATTENTION_CLEARED:
  		dev_warn(&h->pdev->dev, "hpsa%d: unit attention "
  		    "cleared by another initiator
  ", h->ctlr);
  		break;
  	default:
  		dev_warn(&h->pdev->dev, "hpsa%d: unknown "
  			"unit attention detected
  ", h->ctlr);
  		break;
  	}
  	return 1;
  }
  
  static ssize_t host_store_rescan(struct device *dev,
  				 struct device_attribute *attr,
  				 const char *buf, size_t count)
  {
  	struct ctlr_info *h;
  	struct Scsi_Host *shost = class_to_shost(dev);

  	h = shost_to_hba(shost);

  	hpsa_scan_start(h->scsi_host);

  	return count;
  }
  
  /* Enqueuing and dequeuing functions for cmdlists. */
  static inline void addQ(struct hlist_head *list, struct CommandList *c)
  {
  	hlist_add_head(&c->list, list);
  }

  static inline u32 next_command(struct ctlr_info *h)
  {
  	u32 a;
  
  	if (unlikely(h->transMethod != CFGTBL_Trans_Performant))
  		return h->access.command_completed(h);
  
  	if ((*(h->reply_pool_head) & 1) == (h->reply_pool_wraparound)) {
  		a = *(h->reply_pool_head); /* Next cmd in ring buffer */
  		(h->reply_pool_head)++;
  		h->commands_outstanding--;
  	} else {
  		a = FIFO_EMPTY;
  	}
  	/* Check for wraparound */
  	if (h->reply_pool_head == (h->reply_pool + h->max_commands)) {
  		h->reply_pool_head = h->reply_pool;
  		h->reply_pool_wraparound ^= 1;
  	}
  	return a;
  }
  
  /* set_performant_mode: Modify the tag for cciss performant
   * set bit 0 for pull model, bits 3-1 for block fetch
   * register number
   */
  static void set_performant_mode(struct ctlr_info *h, struct CommandList *c)
  {
  	if (likely(h->transMethod == CFGTBL_Trans_Performant))
  		c->busaddr |= 1 | (h->blockFetchTable[c->Header.SGList] << 1);
  }

  static void enqueue_cmd_and_start_io(struct ctlr_info *h,
  	struct CommandList *c)
  {
  	unsigned long flags;

  
  	set_performant_mode(h, c);

  	spin_lock_irqsave(&h->lock, flags);
  	addQ(&h->reqQ, c);
  	h->Qdepth++;
  	start_io(h);
  	spin_unlock_irqrestore(&h->lock, flags);
  }
  
  static inline void removeQ(struct CommandList *c)
  {
  	if (WARN_ON(hlist_unhashed(&c->list)))
  		return;
  	hlist_del_init(&c->list);
  }
  
  static inline int is_hba_lunid(unsigned char scsi3addr[])
  {
  	return memcmp(scsi3addr, RAID_CTLR_LUNID, 8) == 0;
  }
  
  static inline int is_logical_dev_addr_mode(unsigned char scsi3addr[])
  {
  	return (scsi3addr[3] & 0xC0) == 0x40;
  }

  static inline int is_scsi_rev_5(struct ctlr_info *h)
  {
  	if (!h->hba_inquiry_data)
  		return 0;
  	if ((h->hba_inquiry_data[2] & 0x07) == 5)
  		return 1;
  	return 0;
  }

  static const char *raid_label[] = { "0", "4", "1(1+0)", "5", "5+1", "ADG",
  	"UNKNOWN"
  };
  #define RAID_UNKNOWN (ARRAY_SIZE(raid_label) - 1)
  
  static ssize_t raid_level_show(struct device *dev,
  	     struct device_attribute *attr, char *buf)
  {
  	ssize_t l = 0;

  	unsigned char rlevel;

  	struct ctlr_info *h;
  	struct scsi_device *sdev;
  	struct hpsa_scsi_dev_t *hdev;
  	unsigned long flags;
  
  	sdev = to_scsi_device(dev);
  	h = sdev_to_hba(sdev);
  	spin_lock_irqsave(&h->lock, flags);
  	hdev = sdev->hostdata;
  	if (!hdev) {
  		spin_unlock_irqrestore(&h->lock, flags);
  		return -ENODEV;
  	}
  
  	/* Is this even a logical drive? */
  	if (!is_logical_dev_addr_mode(hdev->scsi3addr)) {
  		spin_unlock_irqrestore(&h->lock, flags);
  		l = snprintf(buf, PAGE_SIZE, "N/A
  ");
  		return l;
  	}
  
  	rlevel = hdev->raid_level;
  	spin_unlock_irqrestore(&h->lock, flags);

  	if (rlevel > RAID_UNKNOWN)

  		rlevel = RAID_UNKNOWN;
  	l = snprintf(buf, PAGE_SIZE, "RAID %s
  ", raid_label[rlevel]);
  	return l;
  }
  
  static ssize_t lunid_show(struct device *dev,
  	     struct device_attribute *attr, char *buf)
  {
  	struct ctlr_info *h;
  	struct scsi_device *sdev;
  	struct hpsa_scsi_dev_t *hdev;
  	unsigned long flags;
  	unsigned char lunid[8];
  
  	sdev = to_scsi_device(dev);
  	h = sdev_to_hba(sdev);
  	spin_lock_irqsave(&h->lock, flags);
  	hdev = sdev->hostdata;
  	if (!hdev) {
  		spin_unlock_irqrestore(&h->lock, flags);
  		return -ENODEV;
  	}
  	memcpy(lunid, hdev->scsi3addr, sizeof(lunid));
  	spin_unlock_irqrestore(&h->lock, flags);
  	return snprintf(buf, 20, "0x%02x%02x%02x%02x%02x%02x%02x%02x
  ",
  		lunid[0], lunid[1], lunid[2], lunid[3],
  		lunid[4], lunid[5], lunid[6], lunid[7]);
  }
  
  static ssize_t unique_id_show(struct device *dev,
  	     struct device_attribute *attr, char *buf)
  {
  	struct ctlr_info *h;
  	struct scsi_device *sdev;
  	struct hpsa_scsi_dev_t *hdev;
  	unsigned long flags;
  	unsigned char sn[16];
  
  	sdev = to_scsi_device(dev);
  	h = sdev_to_hba(sdev);
  	spin_lock_irqsave(&h->lock, flags);
  	hdev = sdev->hostdata;
  	if (!hdev) {
  		spin_unlock_irqrestore(&h->lock, flags);
  		return -ENODEV;
  	}
  	memcpy(sn, hdev->device_id, sizeof(sn));
  	spin_unlock_irqrestore(&h->lock, flags);
  	return snprintf(buf, 16 * 2 + 2,
  			"%02X%02X%02X%02X%02X%02X%02X%02X"
  			"%02X%02X%02X%02X%02X%02X%02X%02X
  ",
  			sn[0], sn[1], sn[2], sn[3],
  			sn[4], sn[5], sn[6], sn[7],
  			sn[8], sn[9], sn[10], sn[11],
  			sn[12], sn[13], sn[14], sn[15]);
  }
  
  static int hpsa_find_target_lun(struct ctlr_info *h,
  	unsigned char scsi3addr[], int bus, int *target, int *lun)
  {
  	/* finds an unused bus, target, lun for a new physical device
  	 * assumes h->devlock is held
  	 */
  	int i, found = 0;
  	DECLARE_BITMAP(lun_taken, HPSA_MAX_SCSI_DEVS_PER_HBA);
  
  	memset(&lun_taken[0], 0, HPSA_MAX_SCSI_DEVS_PER_HBA >> 3);
  
  	for (i = 0; i < h->ndevices; i++) {
  		if (h->dev[i]->bus == bus && h->dev[i]->target != -1)
  			set_bit(h->dev[i]->target, lun_taken);
  	}
  
  	for (i = 0; i < HPSA_MAX_SCSI_DEVS_PER_HBA; i++) {
  		if (!test_bit(i, lun_taken)) {
  			/* *bus = 1; */
  			*target = i;
  			*lun = 0;
  			found = 1;
  			break;
  		}
  	}
  	return !found;
  }
  
  /* Add an entry into h->dev[] array. */
  static int hpsa_scsi_add_entry(struct ctlr_info *h, int hostno,
  		struct hpsa_scsi_dev_t *device,
  		struct hpsa_scsi_dev_t *added[], int *nadded)
  {
  	/* assumes h->devlock is held */
  	int n = h->ndevices;
  	int i;
  	unsigned char addr1[8], addr2[8];
  	struct hpsa_scsi_dev_t *sd;
  
  	if (n >= HPSA_MAX_SCSI_DEVS_PER_HBA) {
  		dev_err(&h->pdev->dev, "too many devices, some will be "
  			"inaccessible.
  ");
  		return -1;
  	}
  
  	/* physical devices do not have lun or target assigned until now. */
  	if (device->lun != -1)
  		/* Logical device, lun is already assigned. */
  		goto lun_assigned;
  
  	/* If this device a non-zero lun of a multi-lun device
  	 * byte 4 of the 8-byte LUN addr will contain the logical
  	 * unit no, zero otherise.
  	 */
  	if (device->scsi3addr[4] == 0) {
  		/* This is not a non-zero lun of a multi-lun device */
  		if (hpsa_find_target_lun(h, device->scsi3addr,
  			device->bus, &device->target, &device->lun) != 0)
  			return -1;
  		goto lun_assigned;
  	}
  
  	/* This is a non-zero lun of a multi-lun device.
  	 * Search through our list and find the device which
  	 * has the same 8 byte LUN address, excepting byte 4.
  	 * Assign the same bus and target for this new LUN.
  	 * Use the logical unit number from the firmware.
  	 */
  	memcpy(addr1, device->scsi3addr, 8);
  	addr1[4] = 0;
  	for (i = 0; i < n; i++) {
  		sd = h->dev[i];
  		memcpy(addr2, sd->scsi3addr, 8);
  		addr2[4] = 0;
  		/* differ only in byte 4? */
  		if (memcmp(addr1, addr2, 8) == 0) {
  			device->bus = sd->bus;
  			device->target = sd->target;
  			device->lun = device->scsi3addr[4];
  			break;
  		}
  	}
  	if (device->lun == -1) {
  		dev_warn(&h->pdev->dev, "physical device with no LUN=0,"
  			" suspect firmware bug or unsupported hardware "
  			"configuration.
  ");
  			return -1;
  	}
  
  lun_assigned:
  
  	h->dev[n] = device;
  	h->ndevices++;
  	added[*nadded] = device;
  	(*nadded)++;
  
  	/* initially, (before registering with scsi layer) we don't
  	 * know our hostno and we don't want to print anything first
  	 * time anyway (the scsi layer's inquiries will show that info)
  	 */
  	/* if (hostno != -1) */
  		dev_info(&h->pdev->dev, "%s device c%db%dt%dl%d added.
  ",
  			scsi_device_type(device->devtype), hostno,
  			device->bus, device->target, device->lun);
  	return 0;
  }

  /* Replace an entry from h->dev[] array. */
  static void hpsa_scsi_replace_entry(struct ctlr_info *h, int hostno,
  	int entry, struct hpsa_scsi_dev_t *new_entry,
  	struct hpsa_scsi_dev_t *added[], int *nadded,
  	struct hpsa_scsi_dev_t *removed[], int *nremoved)
  {
  	/* assumes h->devlock is held */
  	BUG_ON(entry < 0 || entry >= HPSA_MAX_SCSI_DEVS_PER_HBA);
  	removed[*nremoved] = h->dev[entry];
  	(*nremoved)++;
  	h->dev[entry] = new_entry;
  	added[*nadded] = new_entry;
  	(*nadded)++;
  	dev_info(&h->pdev->dev, "%s device c%db%dt%dl%d changed.
  ",
  		scsi_device_type(new_entry->devtype), hostno, new_entry->bus,
  			new_entry->target, new_entry->lun);
  }

  /* Remove an entry from h->dev[] array. */
  static void hpsa_scsi_remove_entry(struct ctlr_info *h, int hostno, int entry,
  	struct hpsa_scsi_dev_t *removed[], int *nremoved)
  {
  	/* assumes h->devlock is held */
  	int i;
  	struct hpsa_scsi_dev_t *sd;

  	BUG_ON(entry < 0 || entry >= HPSA_MAX_SCSI_DEVS_PER_HBA);

  
  	sd = h->dev[entry];
  	removed[*nremoved] = h->dev[entry];
  	(*nremoved)++;
  
  	for (i = entry; i < h->ndevices-1; i++)
  		h->dev[i] = h->dev[i+1];
  	h->ndevices--;
  	dev_info(&h->pdev->dev, "%s device c%db%dt%dl%d removed.
  ",
  		scsi_device_type(sd->devtype), hostno, sd->bus, sd->target,
  		sd->lun);
  }
  
  #define SCSI3ADDR_EQ(a, b) ( \
  	(a)[7] == (b)[7] && \
  	(a)[6] == (b)[6] && \
  	(a)[5] == (b)[5] && \
  	(a)[4] == (b)[4] && \
  	(a)[3] == (b)[3] && \
  	(a)[2] == (b)[2] && \
  	(a)[1] == (b)[1] && \
  	(a)[0] == (b)[0])
  
  static void fixup_botched_add(struct ctlr_info *h,
  	struct hpsa_scsi_dev_t *added)
  {
  	/* called when scsi_add_device fails in order to re-adjust
  	 * h->dev[] to match the mid layer's view.
  	 */
  	unsigned long flags;
  	int i, j;
  
  	spin_lock_irqsave(&h->lock, flags);
  	for (i = 0; i < h->ndevices; i++) {
  		if (h->dev[i] == added) {
  			for (j = i; j < h->ndevices-1; j++)
  				h->dev[j] = h->dev[j+1];
  			h->ndevices--;
  			break;
  		}
  	}
  	spin_unlock_irqrestore(&h->lock, flags);
  	kfree(added);
  }
  
  static inline int device_is_the_same(struct hpsa_scsi_dev_t *dev1,
  	struct hpsa_scsi_dev_t *dev2)
  {
  	if ((is_logical_dev_addr_mode(dev1->scsi3addr) ||
  		(dev1->lun != -1 && dev2->lun != -1)) &&
  		dev1->devtype != 0x0C)
  		return (memcmp(dev1, dev2, sizeof(*dev1)) == 0);
  
  	/* we compare everything except lun and target as these
  	 * are not yet assigned.  Compare parts likely
  	 * to differ first
  	 */
  	if (memcmp(dev1->scsi3addr, dev2->scsi3addr,
  		sizeof(dev1->scsi3addr)) != 0)
  		return 0;
  	if (memcmp(dev1->device_id, dev2->device_id,
  		sizeof(dev1->device_id)) != 0)
  		return 0;
  	if (memcmp(dev1->model, dev2->model, sizeof(dev1->model)) != 0)
  		return 0;
  	if (memcmp(dev1->vendor, dev2->vendor, sizeof(dev1->vendor)) != 0)
  		return 0;
  	if (memcmp(dev1->revision, dev2->revision, sizeof(dev1->revision)) != 0)
  		return 0;
  	if (dev1->devtype != dev2->devtype)
  		return 0;
  	if (dev1->raid_level != dev2->raid_level)
  		return 0;
  	if (dev1->bus != dev2->bus)
  		return 0;
  	return 1;
  }
  
  /* Find needle in haystack.  If exact match found, return DEVICE_SAME,
   * and return needle location in *index.  If scsi3addr matches, but not
   * vendor, model, serial num, etc. return DEVICE_CHANGED, and return needle
   * location in *index.  If needle not found, return DEVICE_NOT_FOUND.
   */
  static int hpsa_scsi_find_entry(struct hpsa_scsi_dev_t *needle,
  	struct hpsa_scsi_dev_t *haystack[], int haystack_size,
  	int *index)
  {
  	int i;
  #define DEVICE_NOT_FOUND 0
  #define DEVICE_CHANGED 1
  #define DEVICE_SAME 2
  	for (i = 0; i < haystack_size; i++) {

  		if (haystack[i] == NULL) /* previously removed. */
  			continue;

  		if (SCSI3ADDR_EQ(needle->scsi3addr, haystack[i]->scsi3addr)) {
  			*index = i;
  			if (device_is_the_same(needle, haystack[i]))
  				return DEVICE_SAME;
  			else
  				return DEVICE_CHANGED;
  		}
  	}
  	*index = -1;
  	return DEVICE_NOT_FOUND;
  }

  static void adjust_hpsa_scsi_table(struct ctlr_info *h, int hostno,

  	struct hpsa_scsi_dev_t *sd[], int nsds)
  {
  	/* sd contains scsi3 addresses and devtypes, and inquiry
  	 * data.  This function takes what's in sd to be the current
  	 * reality and updates h->dev[] to reflect that reality.
  	 */
  	int i, entry, device_change, changes = 0;
  	struct hpsa_scsi_dev_t *csd;
  	unsigned long flags;
  	struct hpsa_scsi_dev_t **added, **removed;
  	int nadded, nremoved;
  	struct Scsi_Host *sh = NULL;
  
  	added = kzalloc(sizeof(*added) * HPSA_MAX_SCSI_DEVS_PER_HBA,
  		GFP_KERNEL);
  	removed = kzalloc(sizeof(*removed) * HPSA_MAX_SCSI_DEVS_PER_HBA,
  		GFP_KERNEL);
  
  	if (!added || !removed) {
  		dev_warn(&h->pdev->dev, "out of memory in "
  			"adjust_hpsa_scsi_table
  ");
  		goto free_and_out;
  	}
  
  	spin_lock_irqsave(&h->devlock, flags);
  
  	/* find any devices in h->dev[] that are not in
  	 * sd[] and remove them from h->dev[], and for any
  	 * devices which have changed, remove the old device
  	 * info and add the new device info.
  	 */
  	i = 0;
  	nremoved = 0;
  	nadded = 0;
  	while (i < h->ndevices) {
  		csd = h->dev[i];
  		device_change = hpsa_scsi_find_entry(csd, sd, nsds, &entry);
  		if (device_change == DEVICE_NOT_FOUND) {
  			changes++;
  			hpsa_scsi_remove_entry(h, hostno, i,
  				removed, &nremoved);
  			continue; /* remove ^^^, hence i not incremented */
  		} else if (device_change == DEVICE_CHANGED) {
  			changes++;

  			hpsa_scsi_replace_entry(h, hostno, i, sd[entry],
  				added, &nadded, removed, &nremoved);

  			/* Set it to NULL to prevent it from being freed
  			 * at the bottom of hpsa_update_scsi_devices()
  			 */
  			sd[entry] = NULL;

  		}
  		i++;
  	}
  
  	/* Now, make sure every device listed in sd[] is also
  	 * listed in h->dev[], adding them if they aren't found
  	 */
  
  	for (i = 0; i < nsds; i++) {
  		if (!sd[i]) /* if already added above. */
  			continue;
  		device_change = hpsa_scsi_find_entry(sd[i], h->dev,
  					h->ndevices, &entry);
  		if (device_change == DEVICE_NOT_FOUND) {
  			changes++;
  			if (hpsa_scsi_add_entry(h, hostno, sd[i],
  				added, &nadded) != 0)
  				break;
  			sd[i] = NULL; /* prevent from being freed later. */
  		} else if (device_change == DEVICE_CHANGED) {
  			/* should never happen... */
  			changes++;
  			dev_warn(&h->pdev->dev,
  				"device unexpectedly changed.
  ");
  			/* but if it does happen, we just ignore that device */
  		}
  	}
  	spin_unlock_irqrestore(&h->devlock, flags);
  
  	/* Don't notify scsi mid layer of any changes the first time through
  	 * (or if there are no changes) scsi_scan_host will do it later the
  	 * first time through.
  	 */
  	if (hostno == -1 || !changes)
  		goto free_and_out;
  
  	sh = h->scsi_host;
  	/* Notify scsi mid layer of any removed devices */
  	for (i = 0; i < nremoved; i++) {
  		struct scsi_device *sdev =
  			scsi_device_lookup(sh, removed[i]->bus,
  				removed[i]->target, removed[i]->lun);
  		if (sdev != NULL) {
  			scsi_remove_device(sdev);
  			scsi_device_put(sdev);
  		} else {
  			/* We don't expect to get here.
  			 * future cmds to this device will get selection
  			 * timeout as if the device was gone.
  			 */
  			dev_warn(&h->pdev->dev, "didn't find c%db%dt%dl%d "
  				" for removal.", hostno, removed[i]->bus,
  				removed[i]->target, removed[i]->lun);
  		}
  		kfree(removed[i]);
  		removed[i] = NULL;
  	}
  
  	/* Notify scsi mid layer of any added devices */
  	for (i = 0; i < nadded; i++) {
  		if (scsi_add_device(sh, added[i]->bus,
  			added[i]->target, added[i]->lun) == 0)
  			continue;
  		dev_warn(&h->pdev->dev, "scsi_add_device c%db%dt%dl%d failed, "
  			"device not added.
  ", hostno, added[i]->bus,
  			added[i]->target, added[i]->lun);
  		/* now we have to remove it from h->dev,
  		 * since it didn't get added to scsi mid layer
  		 */
  		fixup_botched_add(h, added[i]);
  	}
  
  free_and_out:
  	kfree(added);
  	kfree(removed);

  }
  
  /*
   * Lookup bus/target/lun and retrun corresponding struct hpsa_scsi_dev_t *
   * Assume's h->devlock is held.
   */
  static struct hpsa_scsi_dev_t *lookup_hpsa_scsi_dev(struct ctlr_info *h,
  	int bus, int target, int lun)
  {
  	int i;
  	struct hpsa_scsi_dev_t *sd;
  
  	for (i = 0; i < h->ndevices; i++) {
  		sd = h->dev[i];
  		if (sd->bus == bus && sd->target == target && sd->lun == lun)
  			return sd;
  	}
  	return NULL;
  }
  
  /* link sdev->hostdata to our per-device structure. */
  static int hpsa_slave_alloc(struct scsi_device *sdev)
  {
  	struct hpsa_scsi_dev_t *sd;
  	unsigned long flags;
  	struct ctlr_info *h;
  
  	h = sdev_to_hba(sdev);
  	spin_lock_irqsave(&h->devlock, flags);
  	sd = lookup_hpsa_scsi_dev(h, sdev_channel(sdev),
  		sdev_id(sdev), sdev->lun);
  	if (sd != NULL)
  		sdev->hostdata = sd;
  	spin_unlock_irqrestore(&h->devlock, flags);
  	return 0;
  }
  
  static void hpsa_slave_destroy(struct scsi_device *sdev)
  {

  	/* nothing to do. */

  }
  
  static void hpsa_scsi_setup(struct ctlr_info *h)
  {
  	h->ndevices = 0;
  	h->scsi_host = NULL;
  	spin_lock_init(&h->devlock);

  }

  static void hpsa_free_sg_chain_blocks(struct ctlr_info *h)
  {
  	int i;
  
  	if (!h->cmd_sg_list)
  		return;
  	for (i = 0; i < h->nr_cmds; i++) {
  		kfree(h->cmd_sg_list[i]);
  		h->cmd_sg_list[i] = NULL;
  	}
  	kfree(h->cmd_sg_list);
  	h->cmd_sg_list = NULL;
  }
  
  static int hpsa_allocate_sg_chain_blocks(struct ctlr_info *h)
  {
  	int i;
  
  	if (h->chainsize <= 0)
  		return 0;
  
  	h->cmd_sg_list = kzalloc(sizeof(*h->cmd_sg_list) * h->nr_cmds,
  				GFP_KERNEL);
  	if (!h->cmd_sg_list)
  		return -ENOMEM;
  	for (i = 0; i < h->nr_cmds; i++) {
  		h->cmd_sg_list[i] = kmalloc(sizeof(*h->cmd_sg_list[i]) *
  						h->chainsize, GFP_KERNEL);
  		if (!h->cmd_sg_list[i])
  			goto clean;
  	}
  	return 0;
  
  clean:
  	hpsa_free_sg_chain_blocks(h);
  	return -ENOMEM;
  }
  
  static void hpsa_map_sg_chain_block(struct ctlr_info *h,
  	struct CommandList *c)
  {
  	struct SGDescriptor *chain_sg, *chain_block;
  	u64 temp64;
  
  	chain_sg = &c->SG[h->max_cmd_sg_entries - 1];
  	chain_block = h->cmd_sg_list[c->cmdindex];
  	chain_sg->Ext = HPSA_SG_CHAIN;
  	chain_sg->Len = sizeof(*chain_sg) *
  		(c->Header.SGTotal - h->max_cmd_sg_entries);
  	temp64 = pci_map_single(h->pdev, chain_block, chain_sg->Len,
  				PCI_DMA_TODEVICE);
  	chain_sg->Addr.lower = (u32) (temp64 & 0x0FFFFFFFFULL);
  	chain_sg->Addr.upper = (u32) ((temp64 >> 32) & 0x0FFFFFFFFULL);
  }
  
  static void hpsa_unmap_sg_chain_block(struct ctlr_info *h,
  	struct CommandList *c)
  {
  	struct SGDescriptor *chain_sg;
  	union u64bit temp64;
  
  	if (c->Header.SGTotal <= h->max_cmd_sg_entries)
  		return;
  
  	chain_sg = &c->SG[h->max_cmd_sg_entries - 1];
  	temp64.val32.lower = chain_sg->Addr.lower;
  	temp64.val32.upper = chain_sg->Addr.upper;
  	pci_unmap_single(h->pdev, temp64.val, chain_sg->Len, PCI_DMA_TODEVICE);
  }

  static void complete_scsi_command(struct CommandList *cp,

  	int timeout, u32 tag)

  {
  	struct scsi_cmnd *cmd;
  	struct ctlr_info *h;
  	struct ErrorInfo *ei;
  
  	unsigned char sense_key;
  	unsigned char asc;      /* additional sense code */
  	unsigned char ascq;     /* additional sense code qualifier */
  
  	ei = cp->err_info;
  	cmd = (struct scsi_cmnd *) cp->scsi_cmd;
  	h = cp->h;
  
  	scsi_dma_unmap(cmd); /* undo the DMA mappings */

  	if (cp->Header.SGTotal > h->max_cmd_sg_entries)
  		hpsa_unmap_sg_chain_block(h, cp);

  
  	cmd->result = (DID_OK << 16); 		/* host byte */
  	cmd->result |= (COMMAND_COMPLETE << 8);	/* msg byte */

  	cmd->result |= ei->ScsiStatus;

  
  	/* copy the sense data whether we need to or not. */
  	memcpy(cmd->sense_buffer, ei->SenseInfo,
  		ei->SenseLen > SCSI_SENSE_BUFFERSIZE ?
  			SCSI_SENSE_BUFFERSIZE :
  			ei->SenseLen);
  	scsi_set_resid(cmd, ei->ResidualCnt);
  
  	if (ei->CommandStatus == 0) {
  		cmd->scsi_done(cmd);
  		cmd_free(h, cp);
  		return;
  	}
  
  	/* an error has occurred */
  	switch (ei->CommandStatus) {
  
  	case CMD_TARGET_STATUS:
  		if (ei->ScsiStatus) {
  			/* Get sense key */
  			sense_key = 0xf & ei->SenseInfo[2];
  			/* Get additional sense code */
  			asc = ei->SenseInfo[12];
  			/* Get addition sense code qualifier */
  			ascq = ei->SenseInfo[13];
  		}
  
  		if (ei->ScsiStatus == SAM_STAT_CHECK_CONDITION) {
  			if (check_for_unit_attention(h, cp)) {
  				cmd->result = DID_SOFT_ERROR << 16;
  				break;
  			}
  			if (sense_key == ILLEGAL_REQUEST) {
  				/*
  				 * SCSI REPORT_LUNS is commonly unsupported on
  				 * Smart Array.  Suppress noisy complaint.
  				 */
  				if (cp->Request.CDB[0] == REPORT_LUNS)
  					break;
  
  				/* If ASC/ASCQ indicate Logical Unit
  				 * Not Supported condition,
  				 */
  				if ((asc == 0x25) && (ascq == 0x0)) {
  					dev_warn(&h->pdev->dev, "cp %p "
  						"has check condition
  ", cp);
  					break;
  				}
  			}
  
  			if (sense_key == NOT_READY) {
  				/* If Sense is Not Ready, Logical Unit
  				 * Not ready, Manual Intervention
  				 * required
  				 */
  				if ((asc == 0x04) && (ascq == 0x03)) {

  					dev_warn(&h->pdev->dev, "cp %p "
  						"has check condition: unit "
  						"not ready, manual "
  						"intervention required
  ", cp);
  					break;
  				}
  			}

  			if (sense_key == ABORTED_COMMAND) {
  				/* Aborted command is retryable */
  				dev_warn(&h->pdev->dev, "cp %p "
  					"has check condition: aborted command: "
  					"ASC: 0x%x, ASCQ: 0x%x
  ",
  					cp, asc, ascq);
  				cmd->result = DID_SOFT_ERROR << 16;
  				break;
  			}

  			/* Must be some other type of check condition */
  			dev_warn(&h->pdev->dev, "cp %p has check condition: "
  					"unknown type: "
  					"Sense: 0x%x, ASC: 0x%x, ASCQ: 0x%x, "
  					"Returning result: 0x%x, "
  					"cmd=[%02x %02x %02x %02x %02x "

  					"%02x %02x %02x %02x %02x %02x "

  					"%02x %02x %02x %02x %02x]
  ",
  					cp, sense_key, asc, ascq,
  					cmd->result,
  					cmd->cmnd[0], cmd->cmnd[1],
  					cmd->cmnd[2], cmd->cmnd[3],
  					cmd->cmnd[4], cmd->cmnd[5],
  					cmd->cmnd[6], cmd->cmnd[7],

  					cmd->cmnd[8], cmd->cmnd[9],
  					cmd->cmnd[10], cmd->cmnd[11],
  					cmd->cmnd[12], cmd->cmnd[13],
  					cmd->cmnd[14], cmd->cmnd[15]);

  			break;
  		}
  
  
  		/* Problem was not a check condition
  		 * Pass it up to the upper layers...
  		 */
  		if (ei->ScsiStatus) {
  			dev_warn(&h->pdev->dev, "cp %p has status 0x%x "
  				"Sense: 0x%x, ASC: 0x%x, ASCQ: 0x%x, "
  				"Returning result: 0x%x
  ",
  				cp, ei->ScsiStatus,
  				sense_key, asc, ascq,
  				cmd->result);
  		} else {  /* scsi status is zero??? How??? */
  			dev_warn(&h->pdev->dev, "cp %p SCSI status was 0. "
  				"Returning no connection.
  ", cp),
  
  			/* Ordinarily, this case should never happen,
  			 * but there is a bug in some released firmware
  			 * revisions that allows it to happen if, for
  			 * example, a 4100 backplane loses power and
  			 * the tape drive is in it.  We assume that
  			 * it's a fatal error of some kind because we
  			 * can't show that it wasn't. We will make it
  			 * look like selection timeout since that is
  			 * the most common reason for this to occur,
  			 * and it's severe enough.
  			 */
  
  			cmd->result = DID_NO_CONNECT << 16;
  		}
  		break;
  
  	case CMD_DATA_UNDERRUN: /* let mid layer handle it. */
  		break;
  	case CMD_DATA_OVERRUN:
  		dev_warn(&h->pdev->dev, "cp %p has"
  			" completed with data overrun "
  			"reported
  ", cp);
  		break;
  	case CMD_INVALID: {
  		/* print_bytes(cp, sizeof(*cp), 1, 0);
  		print_cmd(cp); */
  		/* We get CMD_INVALID if you address a non-existent device
  		 * instead of a selection timeout (no response).  You will
  		 * see this if you yank out a drive, then try to access it.
  		 * This is kind of a shame because it means that any other
  		 * CMD_INVALID (e.g. driver bug) will get interpreted as a
  		 * missing target. */
  		cmd->result = DID_NO_CONNECT << 16;
  	}
  		break;
  	case CMD_PROTOCOL_ERR:
  		dev_warn(&h->pdev->dev, "cp %p has "
  			"protocol error 
  ", cp);
  		break;
  	case CMD_HARDWARE_ERR:
  		cmd->result = DID_ERROR << 16;
  		dev_warn(&h->pdev->dev, "cp %p had  hardware error
  ", cp);
  		break;
  	case CMD_CONNECTION_LOST:
  		cmd->result = DID_ERROR << 16;
  		dev_warn(&h->pdev->dev, "cp %p had connection lost
  ", cp);
  		break;
  	case CMD_ABORTED:
  		cmd->result = DID_ABORT << 16;
  		dev_warn(&h->pdev->dev, "cp %p was aborted with status 0x%x
  ",
  				cp, ei->ScsiStatus);
  		break;
  	case CMD_ABORT_FAILED:
  		cmd->result = DID_ERROR << 16;
  		dev_warn(&h->pdev->dev, "cp %p reports abort failed
  ", cp);
  		break;
  	case CMD_UNSOLICITED_ABORT:

  		cmd->result = DID_RESET << 16;

  		dev_warn(&h->pdev->dev, "cp %p aborted do to an unsolicited "
  			"abort
  ", cp);
  		break;
  	case CMD_TIMEOUT:
  		cmd->result = DID_TIME_OUT << 16;
  		dev_warn(&h->pdev->dev, "cp %p timedout
  ", cp);
  		break;
  	default:
  		cmd->result = DID_ERROR << 16;
  		dev_warn(&h->pdev->dev, "cp %p returned unknown status %x
  ",
  				cp, ei->CommandStatus);
  	}
  	cmd->scsi_done(cmd);
  	cmd_free(h, cp);
  }
  
  static int hpsa_scsi_detect(struct ctlr_info *h)
  {
  	struct Scsi_Host *sh;
  	int error;
  
  	sh = scsi_host_alloc(&hpsa_driver_template, sizeof(h));
  	if (sh == NULL)
  		goto fail;
  
  	sh->io_port = 0;
  	sh->n_io_port = 0;
  	sh->this_id = -1;
  	sh->max_channel = 3;
  	sh->max_cmd_len = MAX_COMMAND_SIZE;
  	sh->max_lun = HPSA_MAX_LUN;
  	sh->max_id = HPSA_MAX_LUN;

  	sh->can_queue = h->nr_cmds;
  	sh->cmd_per_lun = h->nr_cmds;

  	sh->sg_tablesize = h->maxsgentries;

  	h->scsi_host = sh;
  	sh->hostdata[0] = (unsigned long) h;

  	sh->irq = h->intr[PERF_MODE_INT];

  	sh->unique_id = sh->irq;
  	error = scsi_add_host(sh, &h->pdev->dev);
  	if (error)
  		goto fail_host_put;
  	scsi_scan_host(sh);
  	return 0;
  
   fail_host_put:
  	dev_err(&h->pdev->dev, "hpsa_scsi_detect: scsi_add_host"
  		" failed for controller %d
  ", h->ctlr);
  	scsi_host_put(sh);

  	return error;

   fail:
  	dev_err(&h->pdev->dev, "hpsa_scsi_detect: scsi_host_alloc"
  		" failed for controller %d
  ", h->ctlr);

  	return -ENOMEM;

  }
  
  static void hpsa_pci_unmap(struct pci_dev *pdev,
  	struct CommandList *c, int sg_used, int data_direction)
  {
  	int i;
  	union u64bit addr64;
  
  	for (i = 0; i < sg_used; i++) {
  		addr64.val32.lower = c->SG[i].Addr.lower;
  		addr64.val32.upper = c->SG[i].Addr.upper;
  		pci_unmap_single(pdev, (dma_addr_t) addr64.val, c->SG[i].Len,
  			data_direction);
  	}
  }
  
  static void hpsa_map_one(struct pci_dev *pdev,
  		struct CommandList *cp,
  		unsigned char *buf,
  		size_t buflen,
  		int data_direction)
  {

  	u64 addr64;

  
  	if (buflen == 0 || data_direction == PCI_DMA_NONE) {
  		cp->Header.SGList = 0;
  		cp->Header.SGTotal = 0;
  		return;
  	}

  	addr64 = (u64) pci_map_single(pdev, buf, buflen, data_direction);

  	cp->SG[0].Addr.lower =

  	  (u32) (addr64 & (u64) 0x00000000FFFFFFFF);

  	cp->SG[0].Addr.upper =

  	  (u32) ((addr64 >> 32) & (u64) 0x00000000FFFFFFFF);

  	cp->SG[0].Len = buflen;

  	cp->Header.SGList = (u8) 1;   /* no. SGs contig in this cmd */
  	cp->Header.SGTotal = (u16) 1; /* total sgs in this cmd list */

  }
  
  static inline void hpsa_scsi_do_simple_cmd_core(struct ctlr_info *h,
  	struct CommandList *c)
  {
  	DECLARE_COMPLETION_ONSTACK(wait);
  
  	c->waiting = &wait;
  	enqueue_cmd_and_start_io(h, c);
  	wait_for_completion(&wait);
  }
  
  static void hpsa_scsi_do_simple_cmd_with_retry(struct ctlr_info *h,
  	struct CommandList *c, int data_direction)
  {
  	int retry_count = 0;
  
  	do {
  		memset(c->err_info, 0, sizeof(c->err_info));
  		hpsa_scsi_do_simple_cmd_core(h, c);
  		retry_count++;
  	} while (check_for_unit_attention(h, c) && retry_count <= 3);
  	hpsa_pci_unmap(h->pdev, c, 1, data_direction);
  }
  
  static void hpsa_scsi_interpret_error(struct CommandList *cp)
  {
  	struct ErrorInfo *ei;
  	struct device *d = &cp->h->pdev->dev;
  
  	ei = cp->err_info;
  	switch (ei->CommandStatus) {
  	case CMD_TARGET_STATUS:
  		dev_warn(d, "cmd %p has completed with errors
  ", cp);
  		dev_warn(d, "cmd %p has SCSI Status = %x
  ", cp,
  				ei->ScsiStatus);
  		if (ei->ScsiStatus == 0)
  			dev_warn(d, "SCSI status is abnormally zero.  "
  			"(probably indicates selection timeout "
  			"reported incorrectly due to a known "
  			"firmware bug, circa July, 2001.)
  ");
  		break;
  	case CMD_DATA_UNDERRUN: /* let mid layer handle it. */
  			dev_info(d, "UNDERRUN
  ");
  		break;
  	case CMD_DATA_OVERRUN:
  		dev_warn(d, "cp %p has completed with data overrun
  ", cp);
  		break;
  	case CMD_INVALID: {
  		/* controller unfortunately reports SCSI passthru's
  		 * to non-existent targets as invalid commands.
  		 */
  		dev_warn(d, "cp %p is reported invalid (probably means "
  			"target device no longer present)
  ", cp);
  		/* print_bytes((unsigned char *) cp, sizeof(*cp), 1, 0);
  		print_cmd(cp);  */
  		}
  		break;
  	case CMD_PROTOCOL_ERR:
  		dev_warn(d, "cp %p has protocol error 
  ", cp);
  		break;
  	case CMD_HARDWARE_ERR:
  		/* cmd->result = DID_ERROR << 16; */
  		dev_warn(d, "cp %p had hardware error
  ", cp);
  		break;
  	case CMD_CONNECTION_LOST:
  		dev_warn(d, "cp %p had connection lost
  ", cp);
  		break;
  	case CMD_ABORTED:
  		dev_warn(d, "cp %p was aborted
  ", cp);
  		break;
  	case CMD_ABORT_FAILED:
  		dev_warn(d, "cp %p reports abort failed
  ", cp);
  		break;
  	case CMD_UNSOLICITED_ABORT:
  		dev_warn(d, "cp %p aborted due to an unsolicited abort
  ", cp);
  		break;
  	case CMD_TIMEOUT:
  		dev_warn(d, "cp %p timed out
  ", cp);
  		break;
  	default:
  		dev_warn(d, "cp %p returned unknown status %x
  ", cp,
  				ei->CommandStatus);
  	}
  }
  
  static int hpsa_scsi_do_inquiry(struct ctlr_info *h, unsigned char *scsi3addr,
  			unsigned char page, unsigned char *buf,
  			unsigned char bufsize)
  {
  	int rc = IO_OK;
  	struct CommandList *c;
  	struct ErrorInfo *ei;
  
  	c = cmd_special_alloc(h);
  
  	if (c == NULL) {			/* trouble... */
  		dev_warn(&h->pdev->dev, "cmd_special_alloc returned NULL!
  ");

  		return -ENOMEM;

  	}
  
  	fill_cmd(c, HPSA_INQUIRY, h, buf, bufsize, page, scsi3addr, TYPE_CMD);
  	hpsa_scsi_do_simple_cmd_with_retry(h, c, PCI_DMA_FROMDEVICE);
  	ei = c->err_info;
  	if (ei->CommandStatus != 0 && ei->CommandStatus != CMD_DATA_UNDERRUN) {
  		hpsa_scsi_interpret_error(c);
  		rc = -1;
  	}
  	cmd_special_free(h, c);
  	return rc;
  }
  
  static int hpsa_send_reset(struct ctlr_info *h, unsigned char *scsi3addr)
  {
  	int rc = IO_OK;
  	struct CommandList *c;
  	struct ErrorInfo *ei;
  
  	c = cmd_special_alloc(h);
  
  	if (c == NULL) {			/* trouble... */
  		dev_warn(&h->pdev->dev, "cmd_special_alloc returned NULL!
  ");

  		return -ENOMEM;

  	}
  
  	fill_cmd(c, HPSA_DEVICE_RESET_MSG, h, NULL, 0, 0, scsi3addr, TYPE_MSG);
  	hpsa_scsi_do_simple_cmd_core(h, c);
  	/* no unmap needed here because no data xfer. */
  
  	ei = c->err_info;
  	if (ei->CommandStatus != 0) {
  		hpsa_scsi_interpret_error(c);
  		rc = -1;
  	}
  	cmd_special_free(h, c);
  	return rc;
  }
  
  static void hpsa_get_raid_level(struct ctlr_info *h,
  	unsigned char *scsi3addr, unsigned char *raid_level)
  {
  	int rc;
  	unsigned char *buf;
  
  	*raid_level = RAID_UNKNOWN;
  	buf = kzalloc(64, GFP_KERNEL);
  	if (!buf)
  		return;
  	rc = hpsa_scsi_do_inquiry(h, scsi3addr, 0xC1, buf, 64);
  	if (rc == 0)
  		*raid_level = buf[8];
  	if (*raid_level > RAID_UNKNOWN)
  		*raid_level = RAID_UNKNOWN;
  	kfree(buf);
  	return;
  }
  
  /* Get the device id from inquiry page 0x83 */
  static int hpsa_get_device_id(struct ctlr_info *h, unsigned char *scsi3addr,
  	unsigned char *device_id, int buflen)
  {
  	int rc;
  	unsigned char *buf;
  
  	if (buflen > 16)
  		buflen = 16;
  	buf = kzalloc(64, GFP_KERNEL);
  	if (!buf)
  		return -1;
  	rc = hpsa_scsi_do_inquiry(h, scsi3addr, 0x83, buf, 64);
  	if (rc == 0)
  		memcpy(device_id, &buf[8], buflen);
  	kfree(buf);
  	return rc != 0;
  }
  
  static int hpsa_scsi_do_report_luns(struct ctlr_info *h, int logical,
  		struct ReportLUNdata *buf, int bufsize,
  		int extended_response)
  {
  	int rc = IO_OK;
  	struct CommandList *c;
  	unsigned char scsi3addr[8];
  	struct ErrorInfo *ei;
  
  	c = cmd_special_alloc(h);
  	if (c == NULL) {			/* trouble... */
  		dev_err(&h->pdev->dev, "cmd_special_alloc returned NULL!
  ");
  		return -1;
  	}

  	/* address the controller */
  	memset(scsi3addr, 0, sizeof(scsi3addr));

  	fill_cmd(c, logical ? HPSA_REPORT_LOG : HPSA_REPORT_PHYS, h,
  		buf, bufsize, 0, scsi3addr, TYPE_CMD);
  	if (extended_response)
  		c->Request.CDB[1] = extended_response;
  	hpsa_scsi_do_simple_cmd_with_retry(h, c, PCI_DMA_FROMDEVICE);
  	ei = c->err_info;
  	if (ei->CommandStatus != 0 &&
  	    ei->CommandStatus != CMD_DATA_UNDERRUN) {
  		hpsa_scsi_interpret_error(c);
  		rc = -1;
  	}
  	cmd_special_free(h, c);
  	return rc;
  }
  
  static inline int hpsa_scsi_do_report_phys_luns(struct ctlr_info *h,
  		struct ReportLUNdata *buf,
  		int bufsize, int extended_response)
  {
  	return hpsa_scsi_do_report_luns(h, 0, buf, bufsize, extended_response);
  }
  
  static inline int hpsa_scsi_do_report_log_luns(struct ctlr_info *h,
  		struct ReportLUNdata *buf, int bufsize)
  {
  	return hpsa_scsi_do_report_luns(h, 1, buf, bufsize, 0);
  }
  
  static inline void hpsa_set_bus_target_lun(struct hpsa_scsi_dev_t *device,
  	int bus, int target, int lun)
  {
  	device->bus = bus;
  	device->target = target;
  	device->lun = lun;
  }
  
  static int hpsa_update_device_info(struct ctlr_info *h,
  	unsigned char scsi3addr[], struct hpsa_scsi_dev_t *this_device)
  {
  #define OBDR_TAPE_INQ_SIZE 49

  	unsigned char *inq_buff;

  	inq_buff = kzalloc(OBDR_TAPE_INQ_SIZE, GFP_KERNEL);

  	if (!inq_buff)
  		goto bail_out;

  	/* Do an inquiry to the device to see what it is. */
  	if (hpsa_scsi_do_inquiry(h, scsi3addr, 0, inq_buff,
  		(unsigned char) OBDR_TAPE_INQ_SIZE) != 0) {
  		/* Inquiry failed (msg printed already) */
  		dev_err(&h->pdev->dev,
  			"hpsa_update_device_info: inquiry failed
  ");
  		goto bail_out;
  	}
  
  	/* As a side effect, record the firmware version number
  	 * if we happen to be talking to the RAID controller.
  	 */
  	if (is_hba_lunid(scsi3addr))
  		memcpy(h->firm_ver, &inq_buff[32], 4);
  
  	this_device->devtype = (inq_buff[0] & 0x1f);
  	memcpy(this_device->scsi3addr, scsi3addr, 8);
  	memcpy(this_device->vendor, &inq_buff[8],
  		sizeof(this_device->vendor));
  	memcpy(this_device->model, &inq_buff[16],
  		sizeof(this_device->model));
  	memcpy(this_device->revision, &inq_buff[32],
  		sizeof(this_device->revision));
  	memset(this_device->device_id, 0,
  		sizeof(this_device->device_id));
  	hpsa_get_device_id(h, scsi3addr, this_device->device_id,
  		sizeof(this_device->device_id));
  
  	if (this_device->devtype == TYPE_DISK &&
  		is_logical_dev_addr_mode(scsi3addr))
  		hpsa_get_raid_level(h, scsi3addr, &this_device->raid_level);
  	else
  		this_device->raid_level = RAID_UNKNOWN;
  
  	kfree(inq_buff);
  	return 0;
  
  bail_out:
  	kfree(inq_buff);
  	return 1;
  }
  
  static unsigned char *msa2xxx_model[] = {
  	"MSA2012",
  	"MSA2024",
  	"MSA2312",
  	"MSA2324",
  	NULL,
  };
  
  static int is_msa2xxx(struct ctlr_info *h, struct hpsa_scsi_dev_t *device)
  {
  	int i;
  
  	for (i = 0; msa2xxx_model[i]; i++)
  		if (strncmp(device->model, msa2xxx_model[i],
  			strlen(msa2xxx_model[i])) == 0)
  			return 1;
  	return 0;
  }
  
  /* Helper function to assign bus, target, lun mapping of devices.
   * Puts non-msa2xxx logical volumes on bus 0, msa2xxx logical
   * volumes on bus 1, physical devices on bus 2. and the hba on bus 3.
   * Logical drive target and lun are assigned at this time, but
   * physical device lun and target assignment are deferred (assigned
   * in hpsa_find_target_lun, called by hpsa_scsi_add_entry.)
   */
  static void figure_bus_target_lun(struct ctlr_info *h,

  	u8 *lunaddrbytes, int *bus, int *target, int *lun,

  	struct hpsa_scsi_dev_t *device)
  {

  	u32 lunid;

  
  	if (is_logical_dev_addr_mode(lunaddrbytes)) {
  		/* logical device */

  		if (unlikely(is_scsi_rev_5(h))) {
  			/* p1210m, logical drives lun assignments
  			 * match SCSI REPORT LUNS data.
  			 */
  			lunid = le32_to_cpu(*((__le32 *) lunaddrbytes));

  			*bus = 0;

  			*target = 0;
  			*lun = (lunid & 0x3fff) + 1;
  		} else {
  			/* not p1210m... */
  			lunid = le32_to_cpu(*((__le32 *) lunaddrbytes));
  			if (is_msa2xxx(h, device)) {
  				/* msa2xxx way, put logicals on bus 1
  				 * and match target/lun numbers box
  				 * reports.
  				 */
  				*bus = 1;
  				*target = (lunid >> 16) & 0x3fff;
  				*lun = lunid & 0x00ff;
  			} else {
  				/* Traditional smart array way. */
  				*bus = 0;
  				*lun = 0;
  				*target = lunid & 0x3fff;
  			}

  		}
  	} else {
  		/* physical device */
  		if (is_hba_lunid(lunaddrbytes))

  			if (unlikely(is_scsi_rev_5(h))) {
  				*bus = 0; /* put p1210m ctlr at 0,0,0 */
  				*target = 0;
  				*lun = 0;
  				return;
  			} else
  				*bus = 3; /* traditional smartarray */

  		else

  			*bus = 2; /* physical disk */

  		*target = -1;
  		*lun = -1; /* we will fill these in later. */
  	}
  }
  
  /*
   * If there is no lun 0 on a target, linux won't find any devices.
   * For the MSA2xxx boxes, we have to manually detect the enclosure
   * which is at lun zero, as CCISS_REPORT_PHYSICAL_LUNS doesn't report
   * it for some reason.  *tmpdevice is the target we're adding,
   * this_device is a pointer into the current element of currentsd[]
   * that we're building up in update_scsi_devices(), below.
   * lunzerobits is a bitmap that tracks which targets already have a
   * lun 0 assigned.
   * Returns 1 if an enclosure was added, 0 if not.
   */
  static int add_msa2xxx_enclosure_device(struct ctlr_info *h,
  	struct hpsa_scsi_dev_t *tmpdevice,

  	struct hpsa_scsi_dev_t *this_device, u8 *lunaddrbytes,

  	int bus, int target, int lun, unsigned long lunzerobits[],
  	int *nmsa2xxx_enclosures)
  {
  	unsigned char scsi3addr[8];
  
  	if (test_bit(target, lunzerobits))
  		return 0; /* There is already a lun 0 on this target. */
  
  	if (!is_logical_dev_addr_mode(lunaddrbytes))
  		return 0; /* It's the logical targets that may lack lun 0. */
  
  	if (!is_msa2xxx(h, tmpdevice))
  		return 0; /* It's only the MSA2xxx that have this problem. */
  
  	if (lun == 0) /* if lun is 0, then obviously we have a lun 0. */
  		return 0;
  
  	if (is_hba_lunid(scsi3addr))
  		return 0; /* Don't add the RAID controller here. */

  	if (is_scsi_rev_5(h))
  		return 0; /* p1210m doesn't need to do this. */

  #define MAX_MSA2XXX_ENCLOSURES 32
  	if (*nmsa2xxx_enclosures >= MAX_MSA2XXX_ENCLOSURES) {
  		dev_warn(&h->pdev->dev, "Maximum number of MSA2XXX "
  			"enclosures exceeded.  Check your hardware "
  			"configuration.");
  		return 0;
  	}
  
  	memset(scsi3addr, 0, 8);
  	scsi3addr[3] = target;
  	if (hpsa_update_device_info(h, scsi3addr, this_device))
  		return 0;
  	(*nmsa2xxx_enclosures)++;
  	hpsa_set_bus_target_lun(this_device, bus, target, 0);
  	set_bit(target, lunzerobits);
  	return 1;
  }
  
  /*
   * Do CISS_REPORT_PHYS and CISS_REPORT_LOG.  Data is returned in physdev,
   * logdev.  The number of luns in physdev and logdev are returned in
   * *nphysicals and *nlogicals, respectively.
   * Returns 0 on success, -1 otherwise.
   */
  static int hpsa_gather_lun_info(struct ctlr_info *h,
  	int reportlunsize,

  	struct ReportLUNdata *physdev, u32 *nphysicals,
  	struct ReportLUNdata *logdev, u32 *nlogicals)

  {
  	if (hpsa_scsi_do_report_phys_luns(h, physdev, reportlunsize, 0)) {
  		dev_err(&h->pdev->dev, "report physical LUNs failed.
  ");
  		return -1;
  	}

  	*nphysicals = be32_to_cpu(*((__be32 *)physdev->LUNListLength)) / 8;

  	if (*nphysicals > HPSA_MAX_PHYS_LUN) {
  		dev_warn(&h->pdev->dev, "maximum physical LUNs (%d) exceeded."
  			"  %d LUNs ignored.
  ", HPSA_MAX_PHYS_LUN,
  			*nphysicals - HPSA_MAX_PHYS_LUN);
  		*nphysicals = HPSA_MAX_PHYS_LUN;
  	}
  	if (hpsa_scsi_do_report_log_luns(h, logdev, reportlunsize)) {
  		dev_err(&h->pdev->dev, "report logical LUNs failed.
  ");
  		return -1;
  	}

  	*nlogicals = be32_to_cpu(*((__be32 *) logdev->LUNListLength)) / 8;

  	/* Reject Logicals in excess of our max capability. */
  	if (*nlogicals > HPSA_MAX_LUN) {
  		dev_warn(&h->pdev->dev,
  			"maximum logical LUNs (%d) exceeded.  "
  			"%d LUNs ignored.
  ", HPSA_MAX_LUN,
  			*nlogicals - HPSA_MAX_LUN);
  			*nlogicals = HPSA_MAX_LUN;
  	}
  	if (*nlogicals + *nphysicals > HPSA_MAX_PHYS_LUN) {
  		dev_warn(&h->pdev->dev,
  			"maximum logical + physical LUNs (%d) exceeded. "
  			"%d LUNs ignored.
  ", HPSA_MAX_PHYS_LUN,
  			*nphysicals + *nlogicals - HPSA_MAX_PHYS_LUN);
  		*nlogicals = HPSA_MAX_PHYS_LUN - *nphysicals;
  	}
  	return 0;
  }

  u8 *figure_lunaddrbytes(struct ctlr_info *h, int raid_ctlr_position, int i,
  	int nphysicals, int nlogicals, struct ReportLUNdata *physdev_list,
  	struct ReportLUNdata *logdev_list)
  {
  	/* Helper function, figure out where the LUN ID info is coming from
  	 * given index i, lists of physical and logical devices, where in
  	 * the list the raid controller is supposed to appear (first or last)
  	 */
  
  	int logicals_start = nphysicals + (raid_ctlr_position == 0);
  	int last_device = nphysicals + nlogicals + (raid_ctlr_position == 0);
  
  	if (i == raid_ctlr_position)
  		return RAID_CTLR_LUNID;
  
  	if (i < logicals_start)
  		return &physdev_list->LUN[i - (raid_ctlr_position == 0)][0];
  
  	if (i < last_device)
  		return &logdev_list->LUN[i - nphysicals -
  			(raid_ctlr_position == 0)][0];
  	BUG();
  	return NULL;
  }

  static void hpsa_update_scsi_devices(struct ctlr_info *h, int hostno)
  {
  	/* the idea here is we could get notified
  	 * that some devices have changed, so we do a report
  	 * physical luns and report logical luns cmd, and adjust
  	 * our list of devices accordingly.
  	 *
  	 * The scsi3addr's of devices won't change so long as the
  	 * adapter is not reset.  That means we can rescan and
  	 * tell which devices we already know about, vs. new
  	 * devices, vs.  disappearing devices.
  	 */
  	struct ReportLUNdata *physdev_list = NULL;
  	struct ReportLUNdata *logdev_list = NULL;
  	unsigned char *inq_buff = NULL;

  	u32 nphysicals = 0;
  	u32 nlogicals = 0;
  	u32 ndev_allocated = 0;

  	struct hpsa_scsi_dev_t **currentsd, *this_device, *tmpdevice;
  	int ncurrent = 0;
  	int reportlunsize = sizeof(*physdev_list) + HPSA_MAX_PHYS_LUN * 8;
  	int i, nmsa2xxx_enclosures, ndevs_to_allocate;
  	int bus, target, lun;

  	int raid_ctlr_position;

  	DECLARE_BITMAP(lunzerobits, HPSA_MAX_TARGETS_PER_CTLR);
  
  	currentsd = kzalloc(sizeof(*currentsd) * HPSA_MAX_SCSI_DEVS_PER_HBA,
  		GFP_KERNEL);
  	physdev_list = kzalloc(reportlunsize, GFP_KERNEL);
  	logdev_list = kzalloc(reportlunsize, GFP_KERNEL);
  	inq_buff = kmalloc(OBDR_TAPE_INQ_SIZE, GFP_KERNEL);
  	tmpdevice = kzalloc(sizeof(*tmpdevice), GFP_KERNEL);
  
  	if (!currentsd || !physdev_list || !logdev_list ||
  		!inq_buff || !tmpdevice) {
  		dev_err(&h->pdev->dev, "out of memory
  ");
  		goto out;
  	}
  	memset(lunzerobits, 0, sizeof(lunzerobits));
  
  	if (hpsa_gather_lun_info(h, reportlunsize, physdev_list, &nphysicals,
  			logdev_list, &nlogicals))
  		goto out;
  
  	/* We might see up to 32 MSA2xxx enclosures, actually 8 of them
  	 * but each of them 4 times through different paths.  The plus 1
  	 * is for the RAID controller.
  	 */
  	ndevs_to_allocate = nphysicals + nlogicals + MAX_MSA2XXX_ENCLOSURES + 1;
  
  	/* Allocate the per device structures */
  	for (i = 0; i < ndevs_to_allocate; i++) {
  		currentsd[i] = kzalloc(sizeof(*currentsd[i]), GFP_KERNEL);
  		if (!currentsd[i]) {
  			dev_warn(&h->pdev->dev, "out of memory at %s:%d
  ",
  				__FILE__, __LINE__);
  			goto out;
  		}
  		ndev_allocated++;
  	}

  	if (unlikely(is_scsi_rev_5(h)))
  		raid_ctlr_position = 0;
  	else
  		raid_ctlr_position = nphysicals + nlogicals;

  	/* adjust our table of devices */
  	nmsa2xxx_enclosures = 0;
  	for (i = 0; i < nphysicals + nlogicals + 1; i++) {

  		u8 *lunaddrbytes;

  
  		/* Figure out where the LUN ID info is coming from */

  		lunaddrbytes = figure_lunaddrbytes(h, raid_ctlr_position,
  			i, nphysicals, nlogicals, physdev_list, logdev_list);

  		/* skip masked physical devices. */

  		if (lunaddrbytes[3] & 0xC0 &&
  			i < nphysicals + (raid_ctlr_position == 0))

  			continue;
  
  		/* Get device type, vendor, model, device id */
  		if (hpsa_update_device_info(h, lunaddrbytes, tmpdevice))
  			continue; /* skip it if we can't talk to it. */
  		figure_bus_target_lun(h, lunaddrbytes, &bus, &target, &lun,
  			tmpdevice);
  		this_device = currentsd[ncurrent];
  
  		/*
  		 * For the msa2xxx boxes, we have to insert a LUN 0 which
  		 * doesn't show up in CCISS_REPORT_PHYSICAL data, but there
  		 * is nonetheless an enclosure device there.  We have to
  		 * present that otherwise linux won't find anything if
  		 * there is no lun 0.
  		 */
  		if (add_msa2xxx_enclosure_device(h, tmpdevice, this_device,
  				lunaddrbytes, bus, target, lun, lunzerobits,
  				&nmsa2xxx_enclosures)) {
  			ncurrent++;
  			this_device = currentsd[ncurrent];
  		}
  
  		*this_device = *tmpdevice;
  		hpsa_set_bus_target_lun(this_device, bus, target, lun);
  
  		switch (this_device->devtype) {
  		case TYPE_ROM: {
  			/* We don't *really* support actual CD-ROM devices,
  			 * just "One Button Disaster Recovery" tape drive
  			 * which temporarily pretends to be a CD-ROM drive.
  			 * So we check that the device is really an OBDR tape
  			 * device by checking for "$DR-10" in bytes 43-48 of
  			 * the inquiry data.
  			 */
  				char obdr_sig[7];
  #define OBDR_TAPE_SIG "$DR-10"
  				strncpy(obdr_sig, &inq_buff[43], 6);
  				obdr_sig[6] = '\0';
  				if (strncmp(obdr_sig, OBDR_TAPE_SIG, 6) != 0)
  					/* Not OBDR device, ignore it. */
  					break;
  			}
  			ncurrent++;
  			break;
  		case TYPE_DISK:
  			if (i < nphysicals)
  				break;
  			ncurrent++;
  			break;
  		case TYPE_TAPE:
  		case TYPE_MEDIUM_CHANGER:
  			ncurrent++;
  			break;
  		case TYPE_RAID:
  			/* Only present the Smartarray HBA as a RAID controller.
  			 * If it's a RAID controller other than the HBA itself
  			 * (an external RAID controller, MSA500 or similar)
  			 * don't present it.
  			 */
  			if (!is_hba_lunid(lunaddrbytes))
  				break;
  			ncurrent++;
  			break;
  		default:
  			break;
  		}
  		if (ncurrent >= HPSA_MAX_SCSI_DEVS_PER_HBA)
  			break;
  	}
  	adjust_hpsa_scsi_table(h, hostno, currentsd, ncurrent);
  out:
  	kfree(tmpdevice);
  	for (i = 0; i < ndev_allocated; i++)
  		kfree(currentsd[i]);
  	kfree(currentsd);
  	kfree(inq_buff);
  	kfree(physdev_list);
  	kfree(logdev_list);

  }
  
  /* hpsa_scatter_gather takes a struct scsi_cmnd, (cmd), and does the pci
   * dma mapping  and fills in the scatter gather entries of the
   * hpsa command, cp.
   */

  static int hpsa_scatter_gather(struct ctlr_info *h,

  		struct CommandList *cp,
  		struct scsi_cmnd *cmd)
  {
  	unsigned int len;
  	struct scatterlist *sg;

  	u64 addr64;

  	int use_sg, i, sg_index, chained;
  	struct SGDescriptor *curr_sg;

  	BUG_ON(scsi_sg_count(cmd) > h->maxsgentries);

  
  	use_sg = scsi_dma_map(cmd);
  	if (use_sg < 0)
  		return use_sg;
  
  	if (!use_sg)
  		goto sglist_finished;

  	curr_sg = cp->SG;
  	chained = 0;
  	sg_index = 0;

  	scsi_for_each_sg(cmd, sg, use_sg, i) {

  		if (i == h->max_cmd_sg_entries - 1 &&
  			use_sg > h->max_cmd_sg_entries) {
  			chained = 1;
  			curr_sg = h->cmd_sg_list[cp->cmdindex];
  			sg_index = 0;
  		}

  		addr64 = (u64) sg_dma_address(sg);

  		len  = sg_dma_len(sg);

  		curr_sg->Addr.lower = (u32) (addr64 & 0x0FFFFFFFFULL);
  		curr_sg->Addr.upper = (u32) ((addr64 >> 32) & 0x0FFFFFFFFULL);
  		curr_sg->Len = len;
  		curr_sg->Ext = 0;  /* we are not chaining */
  		curr_sg++;
  	}
  
  	if (use_sg + chained > h->maxSG)
  		h->maxSG = use_sg + chained;
  
  	if (chained) {
  		cp->Header.SGList = h->max_cmd_sg_entries;
  		cp->Header.SGTotal = (u16) (use_sg + 1);
  		hpsa_map_sg_chain_block(h, cp);
  		return 0;

  	}
  
  sglist_finished:

  	cp->Header.SGList = (u8) use_sg;   /* no. SGs contig in this cmd */
  	cp->Header.SGTotal = (u16) use_sg; /* total sgs in this cmd list */

  	return 0;
  }
  
  
  static int hpsa_scsi_queue_command(struct scsi_cmnd *cmd,
  	void (*done)(struct scsi_cmnd *))
  {
  	struct ctlr_info *h;
  	struct hpsa_scsi_dev_t *dev;
  	unsigned char scsi3addr[8];
  	struct CommandList *c;
  	unsigned long flags;
  
  	/* Get the ptr to our adapter structure out of cmd->host. */
  	h = sdev_to_hba(cmd->device);
  	dev = cmd->device->hostdata;
  	if (!dev) {
  		cmd->result = DID_NO_CONNECT << 16;
  		done(cmd);
  		return 0;
  	}
  	memcpy(scsi3addr, dev->scsi3addr, sizeof(scsi3addr));
  
  	/* Need a lock as this is being allocated from the pool */
  	spin_lock_irqsave(&h->lock, flags);
  	c = cmd_alloc(h);
  	spin_unlock_irqrestore(&h->lock, flags);
  	if (c == NULL) {			/* trouble... */
  		dev_err(&h->pdev->dev, "cmd_alloc returned NULL!
  ");
  		return SCSI_MLQUEUE_HOST_BUSY;
  	}
  
  	/* Fill in the command list header */
  
  	cmd->scsi_done = done;    /* save this for use by completion code */
  
  	/* save c in case we have to abort it  */
  	cmd->host_scribble = (unsigned char *) c;
  
  	c->cmd_type = CMD_SCSI;
  	c->scsi_cmd = cmd;
  	c->Header.ReplyQueue = 0;  /* unused in simple mode */
  	memcpy(&c->Header.LUN.LunAddrBytes[0], &scsi3addr[0], 8);

  	c->Header.Tag.lower = (c->cmdindex << DIRECT_LOOKUP_SHIFT);
  	c->Header.Tag.lower |= DIRECT_LOOKUP_BIT;

  
  	/* Fill in the request block... */
  
  	c->Request.Timeout = 0;
  	memset(c->Request.CDB, 0, sizeof(c->Request.CDB));
  	BUG_ON(cmd->cmd_len > sizeof(c->Request.CDB));
  	c->Request.CDBLen = cmd->cmd_len;
  	memcpy(c->Request.CDB, cmd->cmnd, cmd->cmd_len);
  	c->Request.Type.Type = TYPE_CMD;
  	c->Request.Type.Attribute = ATTR_SIMPLE;
  	switch (cmd->sc_data_direction) {
  	case DMA_TO_DEVICE:
  		c->Request.Type.Direction = XFER_WRITE;
  		break;
  	case DMA_FROM_DEVICE:
  		c->Request.Type.Direction = XFER_READ;
  		break;
  	case DMA_NONE:
  		c->Request.Type.Direction = XFER_NONE;
  		break;
  	case DMA_BIDIRECTIONAL:
  		/* This can happen if a buggy application does a scsi passthru
  		 * and sets both inlen and outlen to non-zero. ( see
  		 * ../scsi/scsi_ioctl.c:scsi_ioctl_send_command() )
  		 */
  
  		c->Request.Type.Direction = XFER_RSVD;
  		/* This is technically wrong, and hpsa controllers should
  		 * reject it with CMD_INVALID, which is the most correct
  		 * response, but non-fibre backends appear to let it
  		 * slide by, and give the same results as if this field
  		 * were set correctly.  Either way is acceptable for
  		 * our purposes here.
  		 */
  
  		break;
  
  	default:
  		dev_err(&h->pdev->dev, "unknown data direction: %d
  ",
  			cmd->sc_data_direction);
  		BUG();
  		break;
  	}

  	if (hpsa_scatter_gather(h, c, cmd) < 0) { /* Fill SG list */

  		cmd_free(h, c);
  		return SCSI_MLQUEUE_HOST_BUSY;
  	}
  	enqueue_cmd_and_start_io(h, c);
  	/* the cmd'll come back via intr handler in complete_scsi_command()  */
  	return 0;
  }

  static void hpsa_scan_start(struct Scsi_Host *sh)
  {
  	struct ctlr_info *h = shost_to_hba(sh);
  	unsigned long flags;
  
  	/* wait until any scan already in progress is finished. */
  	while (1) {
  		spin_lock_irqsave(&h->scan_lock, flags);
  		if (h->scan_finished)
  			break;
  		spin_unlock_irqrestore(&h->scan_lock, flags);
  		wait_event(h->scan_wait_queue, h->scan_finished);
  		/* Note: We don't need to worry about a race between this
  		 * thread and driver unload because the midlayer will
  		 * have incremented the reference count, so unload won't
  		 * happen if we're in here.
  		 */
  	}
  	h->scan_finished = 0; /* mark scan as in progress */
  	spin_unlock_irqrestore(&h->scan_lock, flags);
  
  	hpsa_update_scsi_devices(h, h->scsi_host->host_no);
  
  	spin_lock_irqsave(&h->scan_lock, flags);
  	h->scan_finished = 1; /* mark scan as finished. */
  	wake_up_all(&h->scan_wait_queue);
  	spin_unlock_irqrestore(&h->scan_lock, flags);
  }
  
  static int hpsa_scan_finished(struct Scsi_Host *sh,
  	unsigned long elapsed_time)
  {
  	struct ctlr_info *h = shost_to_hba(sh);
  	unsigned long flags;
  	int finished;
  
  	spin_lock_irqsave(&h->scan_lock, flags);
  	finished = h->scan_finished;
  	spin_unlock_irqrestore(&h->scan_lock, flags);
  	return finished;
  }

  static int hpsa_change_queue_depth(struct scsi_device *sdev,
  	int qdepth, int reason)
  {
  	struct ctlr_info *h = sdev_to_hba(sdev);
  
  	if (reason != SCSI_QDEPTH_DEFAULT)
  		return -ENOTSUPP;
  
  	if (qdepth < 1)
  		qdepth = 1;
  	else
  		if (qdepth > h->nr_cmds)
  			qdepth = h->nr_cmds;
  	scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
  	return sdev->queue_depth;
  }

  static void hpsa_unregister_scsi(struct ctlr_info *h)
  {
  	/* we are being forcibly unloaded, and may not refuse. */
  	scsi_remove_host(h->scsi_host);
  	scsi_host_put(h->scsi_host);
  	h->scsi_host = NULL;
  }
  
  static int hpsa_register_scsi(struct ctlr_info *h)
  {
  	int rc;

  	rc = hpsa_scsi_detect(h);
  	if (rc != 0)
  		dev_err(&h->pdev->dev, "hpsa_register_scsi: failed"
  			" hpsa_scsi_detect(), rc is %d
  ", rc);
  	return rc;
  }
  
  static int wait_for_device_to_become_ready(struct ctlr_info *h,
  	unsigned char lunaddr[])
  {
  	int rc = 0;
  	int count = 0;
  	int waittime = 1; /* seconds */
  	struct CommandList *c;
  
  	c = cmd_special_alloc(h);
  	if (!c) {
  		dev_warn(&h->pdev->dev, "out of memory in "
  			"wait_for_device_to_become_ready.
  ");
  		return IO_ERROR;
  	}
  
  	/* Send test unit ready until device ready, or give up. */
  	while (count < HPSA_TUR_RETRY_LIMIT) {
  
  		/* Wait for a bit.  do this first, because if we send
  		 * the TUR right away, the reset will just abort it.
  		 */
  		msleep(1000 * waittime);
  		count++;
  
  		/* Increase wait time with each try, up to a point. */
  		if (waittime < HPSA_MAX_WAIT_INTERVAL_SECS)
  			waittime = waittime * 2;
  
  		/* Send the Test Unit Ready */
  		fill_cmd(c, TEST_UNIT_READY, h, NULL, 0, 0, lunaddr, TYPE_CMD);
  		hpsa_scsi_do_simple_cmd_core(h, c);
  		/* no unmap needed here because no data xfer. */
  
  		if (c->err_info->CommandStatus == CMD_SUCCESS)
  			break;
  
  		if (c->err_info->CommandStatus == CMD_TARGET_STATUS &&
  			c->err_info->ScsiStatus == SAM_STAT_CHECK_CONDITION &&
  			(c->err_info->SenseInfo[2] == NO_SENSE ||
  			c->err_info->SenseInfo[2] == UNIT_ATTENTION))
  			break;
  
  		dev_warn(&h->pdev->dev, "waiting %d secs "
  			"for device to become ready.
  ", waittime);
  		rc = 1; /* device not ready. */
  	}
  
  	if (rc)
  		dev_warn(&h->pdev->dev, "giving up on device.
  ");
  	else
  		dev_warn(&h->pdev->dev, "device is ready.
  ");
  
  	cmd_special_free(h, c);
  	return rc;
  }
  
  /* Need at least one of these error handlers to keep ../scsi/hosts.c from
   * complaining.  Doing a host- or bus-reset can't do anything good here.
   */
  static int hpsa_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
  {
  	int rc;
  	struct ctlr_info *h;
  	struct hpsa_scsi_dev_t *dev;
  
  	/* find the controller to which the command to be aborted was sent */
  	h = sdev_to_hba(scsicmd->device);
  	if (h == NULL) /* paranoia */
  		return FAILED;

  	dev = scsicmd->device->hostdata;
  	if (!dev) {
  		dev_err(&h->pdev->dev, "hpsa_eh_device_reset_handler: "
  			"device lookup failed.
  ");
  		return FAILED;
  	}

  	dev_warn(&h->pdev->dev, "resetting device %d:%d:%d:%d
  ",
  		h->scsi_host->host_no, dev->bus, dev->target, dev->lun);

  	/* send a reset to the SCSI LUN which the command was sent to */
  	rc = hpsa_send_reset(h, dev->scsi3addr);
  	if (rc == 0 && wait_for_device_to_become_ready(h, dev->scsi3addr) == 0)
  		return SUCCESS;
  
  	dev_warn(&h->pdev->dev, "resetting device failed.
  ");
  	return FAILED;
  }
  
  /*
   * 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.  Lock must be held when calling this.
   * cmd_free() is the complement.
   */
  static struct CommandList *cmd_alloc(struct ctlr_info *h)
  {
  	struct CommandList *c;
  	int i;
  	union u64bit temp64;
  	dma_addr_t cmd_dma_handle, err_dma_handle;
  
  	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);
  	c = h->cmd_pool + i;
  	memset(c, 0, sizeof(*c));
  	cmd_dma_handle = h->cmd_pool_dhandle
  	    + i * sizeof(*c);
  	c->err_info = h->errinfo_pool + i;
  	memset(c->err_info, 0, sizeof(*c->err_info));
  	err_dma_handle = h->errinfo_pool_dhandle
  	    + i * sizeof(*c->err_info);
  	h->nr_allocs++;
  
  	c->cmdindex = i;
  
  	INIT_HLIST_NODE(&c->list);

  	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(*c->err_info);
  
  	c->h = h;
  	return c;
  }
  
  /* For operations that can wait for kmalloc to possibly sleep,
   * this routine can be called. Lock need not be held to call
   * cmd_special_alloc. cmd_special_free() is the complement.
   */
  static struct CommandList *cmd_special_alloc(struct ctlr_info *h)
  {
  	struct CommandList *c;
  	union u64bit temp64;
  	dma_addr_t cmd_dma_handle, err_dma_handle;
  
  	c = pci_alloc_consistent(h->pdev, sizeof(*c), &cmd_dma_handle);
  	if (c == NULL)
  		return NULL;
  	memset(c, 0, sizeof(*c));
  
  	c->cmdindex = -1;
  
  	c->err_info = pci_alloc_consistent(h->pdev, sizeof(*c->err_info),
  		    &err_dma_handle);
  
  	if (c->err_info == NULL) {
  		pci_free_consistent(h->pdev,
  			sizeof(*c), c, cmd_dma_handle);
  		return NULL;
  	}
  	memset(c->err_info, 0, sizeof(*c->err_info));
  
  	INIT_HLIST_NODE(&c->list);

  	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(*c->err_info);
  
  	c->h = h;
  	return c;
  }
  
  static void cmd_free(struct ctlr_info *h, struct CommandList *c)
  {
  	int i;
  
  	i = c - h->cmd_pool;
  	clear_bit(i & (BITS_PER_LONG - 1),
  		  h->cmd_pool_bits + (i / BITS_PER_LONG));
  	h->nr_frees++;
  }
  
  static void cmd_special_free(struct ctlr_info *h, struct CommandList *c)
  {
  	union u64bit temp64;
  
  	temp64.val32.lower = c->ErrDesc.Addr.lower;
  	temp64.val32.upper = c->ErrDesc.Addr.upper;
  	pci_free_consistent(h->pdev, sizeof(*c->err_info),
  			    c->err_info, (dma_addr_t) temp64.val);
  	pci_free_consistent(h->pdev, sizeof(*c),
  			    c, (dma_addr_t) c->busaddr);
  }
  
  #ifdef CONFIG_COMPAT

  static int hpsa_ioctl32_passthru(struct scsi_device *dev, int cmd, void *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 = hpsa_ioctl(dev, CCISS_PASSTHRU, (void *)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 hpsa_ioctl32_big_passthru(struct scsi_device *dev,
  	int cmd, void *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 = hpsa_ioctl(dev, CCISS_BIG_PASSTHRU, (void *)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 hpsa_compat_ioctl(struct scsi_device *dev, int cmd, void *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 hpsa_ioctl(dev, cmd, arg);
  
  	case CCISS_PASSTHRU32:
  		return hpsa_ioctl32_passthru(dev, cmd, arg);
  	case CCISS_BIG_PASSTHRU32:
  		return hpsa_ioctl32_big_passthru(dev, cmd, arg);
  
  	default:
  		return -ENOIOCTLCMD;
  	}
  }

  #endif
  
  static int hpsa_getpciinfo_ioctl(struct ctlr_info *h, void __user *argp)
  {
  	struct hpsa_pci_info pciinfo;
  
  	if (!argp)
  		return -EINVAL;
  	pciinfo.domain = pci_domain_nr(h->pdev->bus);
  	pciinfo.bus = h->pdev->bus->number;
  	pciinfo.dev_fn = h->pdev->devfn;
  	pciinfo.board_id = h->board_id;
  	if (copy_to_user(argp, &pciinfo, sizeof(pciinfo)))
  		return -EFAULT;
  	return 0;
  }
  
  static int hpsa_getdrivver_ioctl(struct ctlr_info *h, void __user *argp)
  {
  	DriverVer_type DriverVer;
  	unsigned char vmaj, vmin, vsubmin;
  	int rc;
  
  	rc = sscanf(HPSA_DRIVER_VERSION, "%hhu.%hhu.%hhu",
  		&vmaj, &vmin, &vsubmin);
  	if (rc != 3) {
  		dev_info(&h->pdev->dev, "driver version string '%s' "
  			"unrecognized.", HPSA_DRIVER_VERSION);
  		vmaj = 0;
  		vmin = 0;
  		vsubmin = 0;
  	}
  	DriverVer = (vmaj << 16) | (vmin << 8) | vsubmin;
  	if (!argp)
  		return -EINVAL;
  	if (copy_to_user(argp, &DriverVer, sizeof(DriverVer_type)))
  		return -EFAULT;
  	return 0;
  }
  
  static int hpsa_passthru_ioctl(struct ctlr_info *h, void __user *argp)
  {
  	IOCTL_Command_struct iocommand;
  	struct CommandList *c;
  	char *buff = NULL;
  	union u64bit temp64;
  
  	if (!argp)
  		return -EINVAL;
  	if (!capable(CAP_SYS_RAWIO))
  		return -EPERM;
  	if (copy_from_user(&iocommand, argp, sizeof(iocommand)))
  		return -EFAULT;
  	if ((iocommand.buf_size < 1) &&
  	    (iocommand.Request.Type.Direction != XFER_NONE)) {
  		return -EINVAL;
  	}
  	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);
  	c = cmd_special_alloc(h);
  	if (c == 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;
  	}
  	memcpy(&c->Header.LUN, &iocommand.LUN_info, sizeof(c->Header.LUN));
  	/* use the kernel address the cmd block for tag */
  	c->Header.Tag.lower = c->busaddr;
  
  	/* Fill in Request block */
  	memcpy(&c->Request, &iocommand.Request,
  		sizeof(c->Request));
  
  	/* Fill in the scatter gather information */
  	if (iocommand.buf_size > 0) {
  		temp64.val = pci_map_single(h->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*/
  	}
  	hpsa_scsi_do_simple_cmd_core(h, c);
  	hpsa_pci_unmap(h->pdev, c, 1, PCI_DMA_BIDIRECTIONAL);
  	check_ioctl_unit_attention(h, c);
  
  	/* Copy the error information out */
  	memcpy(&iocommand.error_info, c->err_info,
  		sizeof(iocommand.error_info));
  	if (copy_to_user(argp, &iocommand, sizeof(iocommand))) {
  		kfree(buff);
  		cmd_special_free(h, c);
  		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_special_free(h, c);
  			return -EFAULT;
  		}
  	}
  	kfree(buff);
  	cmd_special_free(h, c);
  	return 0;
  }
  
  static int hpsa_big_passthru_ioctl(struct ctlr_info *h, void __user *argp)
  {
  	BIG_IOCTL_Command_struct *ioc;
  	struct CommandList *c;
  	unsigned char **buff = NULL;
  	int *buff_size = NULL;
  	union u64bit temp64;
  	BYTE sg_used = 0;
  	int status = 0;
  	int i;

  	u32 left;
  	u32 sz;

  	BYTE __user *data_ptr;
  
  	if (!argp)
  		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++;
  	}
  	c = cmd_special_alloc(h);
  	if (c == 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;
  	}
  	memcpy(&c->Header.LUN, &ioc->LUN_info, sizeof(c->Header.LUN));
  	c->Header.Tag.lower = c->busaddr;
  	memcpy(&c->Request, &ioc->Request, sizeof(c->Request));
  	if (ioc->buf_size > 0) {
  		int i;
  		for (i = 0; i < sg_used; i++) {
  			temp64.val = pci_map_single(h->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];
  			/* we are not chaining */
  			c->SG[i].Ext = 0;
  		}
  	}
  	hpsa_scsi_do_simple_cmd_core(h, c);
  	hpsa_pci_unmap(h->pdev, c, sg_used, PCI_DMA_BIDIRECTIONAL);
  	check_ioctl_unit_attention(h, c);
  	/* Copy the error information out */
  	memcpy(&ioc->error_info, c->err_info, sizeof(ioc->error_info));
  	if (copy_to_user(argp, ioc, sizeof(*ioc))) {
  		cmd_special_free(h, c);
  		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_special_free(h, c);
  				status = -EFAULT;
  				goto cleanup1;
  			}
  			ptr += buff_size[i];
  		}
  	}
  	cmd_special_free(h, c);
  	status = 0;
  cleanup1:
  	if (buff) {
  		for (i = 0; i < sg_used; i++)
  			kfree(buff[i]);
  		kfree(buff);
  	}
  	kfree(buff_size);
  	kfree(ioc);
  	return status;
  }
  
  static void check_ioctl_unit_attention(struct ctlr_info *h,
  	struct CommandList *c)
  {
  	if (c->err_info->CommandStatus == CMD_TARGET_STATUS &&
  			c->err_info->ScsiStatus != SAM_STAT_CHECK_CONDITION)
  		(void) check_for_unit_attention(h, c);
  }
  /*
   * ioctl
   */
  static int hpsa_ioctl(struct scsi_device *dev, int cmd, void *arg)
  {
  	struct ctlr_info *h;
  	void __user *argp = (void __user *)arg;
  
  	h = sdev_to_hba(dev);
  
  	switch (cmd) {
  	case CCISS_DEREGDISK:
  	case CCISS_REGNEWDISK:
  	case CCISS_REGNEWD:

  		hpsa_scan_start(h->scsi_host);

  		return 0;
  	case CCISS_GETPCIINFO:
  		return hpsa_getpciinfo_ioctl(h, argp);
  	case CCISS_GETDRIVVER:
  		return hpsa_getdrivver_ioctl(h, argp);
  	case CCISS_PASSTHRU:
  		return hpsa_passthru_ioctl(h, argp);
  	case CCISS_BIG_PASSTHRU:
  		return hpsa_big_passthru_ioctl(h, argp);
  	default:
  		return -ENOTTY;
  	}
  }

  static void fill_cmd(struct CommandList *c, u8 cmd, struct ctlr_info *h,
  	void *buff, size_t size, u8 page_code, unsigned char *scsi3addr,

  	int cmd_type)
  {
  	int pci_dir = XFER_NONE;
  
  	c->cmd_type = CMD_IOCTL_PEND;
  	c->Header.ReplyQueue = 0;
  	if (buff != NULL && size > 0) {
  		c->Header.SGList = 1;
  		c->Header.SGTotal = 1;
  	} else {
  		c->Header.SGList = 0;
  		c->Header.SGTotal = 0;
  	}
  	c->Header.Tag.lower = c->busaddr;
  	memcpy(c->Header.LUN.LunAddrBytes, scsi3addr, 8);
  
  	c->Request.Type.Type = cmd_type;
  	if (cmd_type == TYPE_CMD) {
  		switch (cmd) {
  		case HPSA_INQUIRY:
  			/* 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] = HPSA_INQUIRY;
  			c->Request.CDB[4] = size & 0xFF;
  			break;
  		case HPSA_REPORT_LOG:
  		case HPSA_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 HPSA_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;
  		case TEST_UNIT_READY:
  			c->Request.CDBLen = 6;
  			c->Request.Type.Attribute = ATTR_SIMPLE;
  			c->Request.Type.Direction = XFER_NONE;
  			c->Request.Timeout = 0;
  			break;
  		default:
  			dev_warn(&h->pdev->dev, "unknown command 0x%c
  ", cmd);
  			BUG();
  			return;
  		}
  	} else if (cmd_type == TYPE_MSG) {
  		switch (cmd) {
  
  		case  HPSA_DEVICE_RESET_MSG:
  			c->Request.CDBLen = 16;
  			c->Request.Type.Type =  1; /* It is a MSG not a CMD */
  			c->Request.Type.Attribute = ATTR_SIMPLE;
  			c->Request.Type.Direction = XFER_NONE;
  			c->Request.Timeout = 0; /* Don't time out */
  			c->Request.CDB[0] =  0x01; /* RESET_MSG is 0x01 */
  			c->Request.CDB[1] = 0x03;  /* Reset target above */
  			/* If bytes 4-7 are zero, it means reset the */
  			/* LunID device */
  			c->Request.CDB[4] = 0x00;
  			c->Request.CDB[5] = 0x00;
  			c->Request.CDB[6] = 0x00;
  			c->Request.CDB[7] = 0x00;
  		break;
  
  		default:
  			dev_warn(&h->pdev->dev, "unknown message type %d
  ",
  				cmd);
  			BUG();
  		}
  	} else {
  		dev_warn(&h->pdev->dev, "unknown command type %d
  ", cmd_type);
  		BUG();
  	}
  
  	switch (c->Request.Type.Direction) {
  	case XFER_READ:
  		pci_dir = PCI_DMA_FROMDEVICE;
  		break;
  	case XFER_WRITE:
  		pci_dir = PCI_DMA_TODEVICE;
  		break;
  	case XFER_NONE:
  		pci_dir = PCI_DMA_NONE;
  		break;
  	default:
  		pci_dir = PCI_DMA_BIDIRECTIONAL;
  	}
  
  	hpsa_map_one(h->pdev, c, buff, size, pci_dir);
  
  	return;
  }
  
  /*
   * 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 cmds off the submission queue and sends them to the hardware,
   * then puts them on the queue of cmds waiting for completion.
   */
  static void start_io(struct ctlr_info *h)
  {
  	struct CommandList *c;
  
  	while (!hlist_empty(&h->reqQ)) {
  		c = hlist_entry(h->reqQ.first, struct CommandList, list);
  		/* can't do anything if fifo is full */
  		if ((h->access.fifo_full(h))) {
  			dev_warn(&h->pdev->dev, "fifo full
  ");
  			break;
  		}
  
  		/* Get the first entry from the Request Q */
  		removeQ(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 unsigned long get_next_completion(struct ctlr_info *h)
  {
  	return h->access.command_completed(h);
  }

  static inline bool interrupt_pending(struct ctlr_info *h)

  {
  	return h->access.intr_pending(h);
  }
  
  static inline long interrupt_not_for_us(struct ctlr_info *h)
  {

  	return !(h->msi_vector || h->msix_vector) &&
  		((h->access.intr_pending(h) == 0) ||
  		(h->interrupts_enabled == 0));

  }

  static inline int bad_tag(struct ctlr_info *h, u32 tag_index,
  	u32 raw_tag)

  {
  	if (unlikely(tag_index >= h->nr_cmds)) {
  		dev_warn(&h->pdev->dev, "bad tag 0x%08x ignored.
  ", raw_tag);
  		return 1;
  	}
  	return 0;
  }

  static inline void finish_cmd(struct CommandList *c, u32 raw_tag)

  {
  	removeQ(c);
  	if (likely(c->cmd_type == CMD_SCSI))
  		complete_scsi_command(c, 0, raw_tag);
  	else if (c->cmd_type == CMD_IOCTL_PEND)
  		complete(c->waiting);
  }

  static inline u32 hpsa_tag_contains_index(u32 tag)
  {

  #define DIRECT_LOOKUP_BIT 0x10

  	return tag & DIRECT_LOOKUP_BIT;
  }
  
  static inline u32 hpsa_tag_to_index(u32 tag)
  {

  #define DIRECT_LOOKUP_SHIFT 5

  	return tag >> DIRECT_LOOKUP_SHIFT;
  }
  
  static inline u32 hpsa_tag_discard_error_bits(u32 tag)
  {
  #define HPSA_ERROR_BITS 0x03
  	return tag & ~HPSA_ERROR_BITS;
  }

  /* process completion of an indexed ("direct lookup") command */
  static inline u32 process_indexed_cmd(struct ctlr_info *h,
  	u32 raw_tag)
  {
  	u32 tag_index;
  	struct CommandList *c;
  
  	tag_index = hpsa_tag_to_index(raw_tag);
  	if (bad_tag(h, tag_index, raw_tag))
  		return next_command(h);
  	c = h->cmd_pool + tag_index;
  	finish_cmd(c, raw_tag);
  	return next_command(h);
  }
  
  /* process completion of a non-indexed command */
  static inline u32 process_nonindexed_cmd(struct ctlr_info *h,
  	u32 raw_tag)
  {
  	u32 tag;
  	struct CommandList *c = NULL;
  	struct hlist_node *tmp;
  
  	tag = hpsa_tag_discard_error_bits(raw_tag);
  	hlist_for_each_entry(c, tmp, &h->cmpQ, list) {
  		if ((c->busaddr & 0xFFFFFFE0) == (tag & 0xFFFFFFE0)) {
  			finish_cmd(c, raw_tag);
  			return next_command(h);
  		}
  	}
  	bad_tag(h, h->nr_cmds + 1, raw_tag);
  	return next_command(h);
  }

  static irqreturn_t do_hpsa_intr(int irq, void *dev_id)
  {
  	struct ctlr_info *h = dev_id;

  	unsigned long flags;

  	u32 raw_tag;

  
  	if (interrupt_not_for_us(h))
  		return IRQ_NONE;
  	spin_lock_irqsave(&h->lock, flags);

  	raw_tag = get_next_completion(h);
  	while (raw_tag != FIFO_EMPTY) {
  		if (hpsa_tag_contains_index(raw_tag))
  			raw_tag = process_indexed_cmd(h, raw_tag);
  		else
  			raw_tag = process_nonindexed_cmd(h, raw_tag);

  	}
  	spin_unlock_irqrestore(&h->lock, flags);
  	return IRQ_HANDLED;
  }

  /* Send a message CDB to the firmware. */

  static __devinit int hpsa_message(struct pci_dev *pdev, unsigned char opcode,
  						unsigned char type)
  {
  	struct Command {
  		struct CommandListHeader CommandHeader;
  		struct RequestBlock Request;
  		struct ErrDescriptor ErrorDescriptor;
  	};
  	struct Command *cmd;
  	static const size_t cmd_sz = sizeof(*cmd) +
  					sizeof(cmd->ErrorDescriptor);
  	dma_addr_t paddr64;
  	uint32_t paddr32, tag;
  	void __iomem *vaddr;
  	int i, err;
  
  	vaddr = pci_ioremap_bar(pdev, 0);
  	if (vaddr == NULL)
  		return -ENOMEM;
  
  	/* The Inbound Post Queue only accepts 32-bit physical addresses for the
  	 * CCISS commands, so they must be allocated from the lower 4GiB of
  	 * memory.
  	 */
  	err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
  	if (err) {
  		iounmap(vaddr);
  		return -ENOMEM;
  	}
  
  	cmd = pci_alloc_consistent(pdev, cmd_sz, &paddr64);
  	if (cmd == NULL) {
  		iounmap(vaddr);
  		return -ENOMEM;
  	}
  
  	/* This must fit, because of the 32-bit consistent DMA mask.  Also,
  	 * although there's no guarantee, we assume that the address is at
  	 * least 4-byte aligned (most likely, it's page-aligned).
  	 */
  	paddr32 = paddr64;
  
  	cmd->CommandHeader.ReplyQueue = 0;
  	cmd->CommandHeader.SGList = 0;
  	cmd->CommandHeader.SGTotal = 0;
  	cmd->CommandHeader.Tag.lower = paddr32;
  	cmd->CommandHeader.Tag.upper = 0;
  	memset(&cmd->CommandHeader.LUN.LunAddrBytes, 0, 8);
  
  	cmd->Request.CDBLen = 16;
  	cmd->Request.Type.Type = TYPE_MSG;
  	cmd->Request.Type.Attribute = ATTR_HEADOFQUEUE;
  	cmd->Request.Type.Direction = XFER_NONE;
  	cmd->Request.Timeout = 0; /* Don't time out */
  	cmd->Request.CDB[0] = opcode;
  	cmd->Request.CDB[1] = type;
  	memset(&cmd->Request.CDB[2], 0, 14); /* rest of the CDB is reserved */
  	cmd->ErrorDescriptor.Addr.lower = paddr32 + sizeof(*cmd);
  	cmd->ErrorDescriptor.Addr.upper = 0;
  	cmd->ErrorDescriptor.Len = sizeof(struct ErrorInfo);
  
  	writel(paddr32, vaddr + SA5_REQUEST_PORT_OFFSET);
  
  	for (i = 0; i < HPSA_MSG_SEND_RETRY_LIMIT; i++) {
  		tag = readl(vaddr + SA5_REPLY_PORT_OFFSET);

  		if (hpsa_tag_discard_error_bits(tag) == paddr32)

  			break;
  		msleep(HPSA_MSG_SEND_RETRY_INTERVAL_MSECS);
  	}
  
  	iounmap(vaddr);
  
  	/* we leak the DMA buffer here ... no choice since the controller could
  	 *  still complete the command.
  	 */
  	if (i == HPSA_MSG_SEND_RETRY_LIMIT) {
  		dev_err(&pdev->dev, "controller message %02x:%02x timed out
  ",
  			opcode, type);
  		return -ETIMEDOUT;
  	}
  
  	pci_free_consistent(pdev, cmd_sz, cmd, paddr64);
  
  	if (tag & HPSA_ERROR_BIT) {
  		dev_err(&pdev->dev, "controller message %02x:%02x failed
  ",
  			opcode, type);
  		return -EIO;
  	}
  
  	dev_info(&pdev->dev, "controller message %02x:%02x succeeded
  ",
  		opcode, type);
  	return 0;
  }
  
  #define hpsa_soft_reset_controller(p) hpsa_message(p, 1, 0)
  #define hpsa_noop(p) hpsa_message(p, 3, 0)
  
  static __devinit int hpsa_reset_msi(struct pci_dev *pdev)
  {
  /* the #defines are stolen from drivers/pci/msi.h. */
  #define msi_control_reg(base)		(base + PCI_MSI_FLAGS)
  #define PCI_MSIX_FLAGS_ENABLE		(1 << 15)
  
  	int pos;
  	u16 control = 0;
  
  	pos = pci_find_capability(pdev, PCI_CAP_ID_MSI);
  	if (pos) {
  		pci_read_config_word(pdev, msi_control_reg(pos), &control);
  		if (control & PCI_MSI_FLAGS_ENABLE) {
  			dev_info(&pdev->dev, "resetting MSI
  ");
  			pci_write_config_word(pdev, msi_control_reg(pos),
  					control & ~PCI_MSI_FLAGS_ENABLE);
  		}
  	}
  
  	pos = pci_find_capability(pdev, PCI_CAP_ID_MSIX);
  	if (pos) {
  		pci_read_config_word(pdev, msi_control_reg(pos), &control);
  		if (control & PCI_MSIX_FLAGS_ENABLE) {
  			dev_info(&pdev->dev, "resetting MSI-X
  ");
  			pci_write_config_word(pdev, msi_control_reg(pos),
  					control & ~PCI_MSIX_FLAGS_ENABLE);
  		}
  	}
  
  	return 0;
  }
  
  /* This does a hard reset of the controller using PCI power management
   * states.
   */
  static __devinit int hpsa_hard_reset_controller(struct pci_dev *pdev)
  {
  	u16 pmcsr, saved_config_space[32];
  	int i, pos;
  
  	dev_info(&pdev->dev, "using PCI PM to reset controller
  ");
  
  	/* This is very nearly the same thing as
  	 *
  	 * pci_save_state(pci_dev);
  	 * pci_set_power_state(pci_dev, PCI_D3hot);
  	 * pci_set_power_state(pci_dev, PCI_D0);
  	 * pci_restore_state(pci_dev);
  	 *
  	 * but we can't use these nice canned kernel routines on
  	 * kexec, because they also check the MSI/MSI-X state in PCI
  	 * configuration space and do the wrong thing when it is
  	 * set/cleared.  Also, the pci_save/restore_state functions
  	 * violate the ordering requirements for restoring the
  	 * configuration space from the CCISS document (see the
  	 * comment below).  So we roll our own ....
  	 */
  
  	for (i = 0; i < 32; i++)
  		pci_read_config_word(pdev, 2*i, &saved_config_space[i]);
  
  	pos = pci_find_capability(pdev, PCI_CAP_ID_PM);
  	if (pos == 0) {
  		dev_err(&pdev->dev,
  			"hpsa_reset_controller: PCI PM not supported
  ");
  		return -ENODEV;
  	}
  
  	/* Quoting from the Open CISS Specification: "The Power
  	 * Management Control/Status Register (CSR) controls the power
  	 * state of the device.  The normal operating state is D0,
  	 * CSR=00h.  The software off state is D3, CSR=03h.  To reset
  	 * the controller, place the interface device in D3 then to
  	 * D0, this causes a secondary PCI reset which will reset the
  	 * controller."
  	 */
  
  	/* enter the D3hot power management state */
  	pci_read_config_word(pdev, pos + PCI_PM_CTRL, &pmcsr);
  	pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
  	pmcsr |= PCI_D3hot;
  	pci_write_config_word(pdev, pos + PCI_PM_CTRL, pmcsr);
  
  	msleep(500);
  
  	/* enter the D0 power management state */
  	pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
  	pmcsr |= PCI_D0;
  	pci_write_config_word(pdev, pos + PCI_PM_CTRL, pmcsr);
  
  	msleep(500);
  
  	/* Restore the PCI configuration space.  The Open CISS
  	 * Specification says, "Restore the PCI Configuration
  	 * Registers, offsets 00h through 60h. It is important to
  	 * restore the command register, 16-bits at offset 04h,
  	 * last. Do not restore the configuration status register,
  	 * 16-bits at offset 06h."  Note that the offset is 2*i.
  	 */
  	for (i = 0; i < 32; i++) {
  		if (i == 2 || i == 3)
  			continue;
  		pci_write_config_word(pdev, 2*i, saved_config_space[i]);
  	}
  	wmb();
  	pci_write_config_word(pdev, 4, saved_config_space[2]);
  
  	return 0;
  }
  
  /*
   *  We cannot read the structure directly, for portability we must use
   *   the io functions.
   *   This is for debug only.
   */
  #ifdef HPSA_DEBUG
  static void print_cfg_table(struct device *dev, struct CfgTable *tb)
  {
  	int i;
  	char temp_name[17];
  
  	dev_info(dev, "Controller Configuration information
  ");
  	dev_info(dev, "------------------------------------
  ");
  	for (i = 0; i < 4; i++)
  		temp_name[i] = readb(&(tb->Signature[i]));
  	temp_name[4] = '\0';
  	dev_info(dev, "   Signature = %s
  ", temp_name);
  	dev_info(dev, "   Spec Number = %d
  ", readl(&(tb->SpecValence)));
  	dev_info(dev, "   Transport methods supported = 0x%x
  ",
  	       readl(&(tb->TransportSupport)));
  	dev_info(dev, "   Transport methods active = 0x%x
  ",
  	       readl(&(tb->TransportActive)));
  	dev_info(dev, "   Requested transport Method = 0x%x
  ",
  	       readl(&(tb->HostWrite.TransportRequest)));
  	dev_info(dev, "   Coalesce Interrupt Delay = 0x%x
  ",
  	       readl(&(tb->HostWrite.CoalIntDelay)));
  	dev_info(dev, "   Coalesce Interrupt Count = 0x%x
  ",
  	       readl(&(tb->HostWrite.CoalIntCount)));
  	dev_info(dev, "   Max outstanding commands = 0x%d
  ",
  	       readl(&(tb->CmdsOutMax)));
  	dev_info(dev, "   Bus Types = 0x%x
  ", readl(&(tb->BusTypes)));
  	for (i = 0; i < 16; i++)
  		temp_name[i] = readb(&(tb->ServerName[i]));
  	temp_name[16] = '\0';
  	dev_info(dev, "   Server Name = %s
  ", temp_name);
  	dev_info(dev, "   Heartbeat Counter = 0x%x
  
  
  ",
  		readl(&(tb->HeartBeat)));
  }
  #endif				/* HPSA_DEBUG */
  
  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 */
  				dev_warn(&pdev->dev,
  				       "base address is invalid
  ");
  				return -1;
  				break;
  			}
  		}
  		if (offset == pci_bar_addr - PCI_BASE_ADDRESS_0)
  			return i + 1;
  	}
  	return -1;
  }
  
  /* If MSI/MSI-X is supported by the kernel we will try to enable it on
   * controllers that are capable. If not, we use IO-APIC mode.
   */
  
  static void __devinit hpsa_interrupt_mode(struct ctlr_info *h,

  					   struct pci_dev *pdev, u32 board_id)

  {
  #ifdef CONFIG_PCI_MSI
  	int err;
  	struct msix_entry hpsa_msix_entries[4] = { {0, 0}, {0, 1},
  	{0, 2}, {0, 3}
  	};
  
  	/* Some boards advertise MSI but don't really support it */
  	if ((board_id == 0x40700E11) ||
  	    (board_id == 0x40800E11) ||
  	    (board_id == 0x40820E11) || (board_id == 0x40830E11))
  		goto default_int_mode;
  	if (pci_find_capability(pdev, PCI_CAP_ID_MSIX)) {
  		dev_info(&pdev->dev, "MSIX
  ");
  		err = pci_enable_msix(pdev, hpsa_msix_entries, 4);
  		if (!err) {
  			h->intr[0] = hpsa_msix_entries[0].vector;
  			h->intr[1] = hpsa_msix_entries[1].vector;
  			h->intr[2] = hpsa_msix_entries[2].vector;
  			h->intr[3] = hpsa_msix_entries[3].vector;
  			h->msix_vector = 1;
  			return;
  		}
  		if (err > 0) {
  			dev_warn(&pdev->dev, "only %d MSI-X vectors "
  			       "available
  ", err);
  			goto default_int_mode;
  		} else {
  			dev_warn(&pdev->dev, "MSI-X init failed %d
  ",
  			       err);
  			goto default_int_mode;
  		}
  	}
  	if (pci_find_capability(pdev, PCI_CAP_ID_MSI)) {
  		dev_info(&pdev->dev, "MSI
  ");
  		if (!pci_enable_msi(pdev))
  			h->msi_vector = 1;
  		else
  			dev_warn(&pdev->dev, "MSI init failed
  ");
  	}
  default_int_mode:
  #endif				/* CONFIG_PCI_MSI */
  	/* if we get here we're going to use the default interrupt mode */

  	h->intr[PERF_MODE_INT] = pdev->irq;

  }

  static int __devinit hpsa_pci_init(struct ctlr_info *h, 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;

  	u32 trans_offset;

  	int i, prod_index, err;
  
  	subsystem_vendor_id = pdev->subsystem_vendor;
  	subsystem_device_id = pdev->subsystem_device;

  	board_id = (((u32) (subsystem_device_id << 16) & 0xffff0000) |

  		    subsystem_vendor_id);
  
  	for (i = 0; i < ARRAY_SIZE(products); i++)
  		if (board_id == products[i].board_id)
  			break;
  
  	prod_index = i;
  
  	if (prod_index == ARRAY_SIZE(products)) {
  		prod_index--;
  		if (subsystem_vendor_id != PCI_VENDOR_ID_HP ||
  				!hpsa_allow_any) {
  			dev_warn(&pdev->dev, "unrecognized board ID:"
  				" 0x%08lx, ignoring.
  ",
  				(unsigned long) board_id);
  			return -ENODEV;
  		}
  	}
  	/* 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)) {
  		dev_warn(&pdev->dev, "controller appears to be disabled
  ");
  		return -ENODEV;
  	}
  
  	err = pci_enable_device(pdev);
  	if (err) {
  		dev_warn(&pdev->dev, "unable to enable PCI device
  ");
  		return err;
  	}
  
  	err = pci_request_regions(pdev, "hpsa");
  	if (err) {
  		dev_err(&pdev->dev, "cannot obtain PCI resources, aborting
  ");
  		return err;
  	}
  
  	/* If the kernel supports MSI/MSI-X we will try to enable that,
  	 * else we use the IO-APIC interrupt assigned to us by system ROM.
  	 */
  	hpsa_interrupt_mode(h, pdev, board_id);
  
  	/* find the memory BAR */
  	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
  		if (pci_resource_flags(pdev, i) & IORESOURCE_MEM)
  			break;
  	}
  	if (i == DEVICE_COUNT_RESOURCE) {
  		dev_warn(&pdev->dev, "no memory BAR found
  ");
  		err = -ENODEV;
  		goto err_out_free_res;
  	}
  
  	h->paddr = pci_resource_start(pdev, i); /* addressing mode bits
  						 * already removed
  						 */
  
  	h->vaddr = remap_pci_mem(h->paddr, 0x250);
  
  	/* Wait for the board to become ready.  */
  	for (i = 0; i < HPSA_BOARD_READY_ITERATIONS; i++) {
  		scratchpad = readl(h->vaddr + SA5_SCRATCHPAD_OFFSET);
  		if (scratchpad == HPSA_FIRMWARE_READY)
  			break;
  		msleep(HPSA_BOARD_READY_POLL_INTERVAL_MSECS);
  	}
  	if (scratchpad != HPSA_FIRMWARE_READY) {
  		dev_warn(&pdev->dev, "board not ready, timed out.
  ");
  		err = -ENODEV;
  		goto err_out_free_res;
  	}
  
  	/* get the address index number */
  	cfg_base_addr = readl(h->vaddr + SA5_CTCFG_OFFSET);

  	cfg_base_addr &= (u32) 0x0000ffff;

  	cfg_base_addr_index = find_PCI_BAR_index(pdev, cfg_base_addr);
  	if (cfg_base_addr_index == -1) {
  		dev_warn(&pdev->dev, "cannot find cfg_base_addr_index
  ");
  		err = -ENODEV;
  		goto err_out_free_res;
  	}
  
  	cfg_offset = readl(h->vaddr + SA5_CTMEM_OFFSET);
  	h->cfgtable = remap_pci_mem(pci_resource_start(pdev,
  			       cfg_base_addr_index) + cfg_offset,
  				sizeof(h->cfgtable));

  	/* Find performant mode table. */
  	trans_offset = readl(&(h->cfgtable->TransMethodOffset));
  	h->transtable = remap_pci_mem(pci_resource_start(pdev,
  				cfg_base_addr_index)+cfg_offset+trans_offset,
  				sizeof(*h->transtable));

  	h->board_id = board_id;
  	h->max_commands = readl(&(h->cfgtable->MaxPerformantModeCommands));

  	h->maxsgentries = readl(&(h->cfgtable->MaxScatterGatherElements));
  
  	/*
  	 * Limit in-command s/g elements to 32 save dma'able memory.
  	 * Howvever spec says if 0, use 31
  	 */
  
  	h->max_cmd_sg_entries = 31;
  	if (h->maxsgentries > 512) {
  		h->max_cmd_sg_entries = 32;
  		h->chainsize = h->maxsgentries - h->max_cmd_sg_entries + 1;
  		h->maxsgentries--; /* save one for chain pointer */
  	} else {
  		h->maxsgentries = 31; /* default to traditional values */
  		h->chainsize = 0;
  	}

  	h->product_name = products[prod_index].product_name;
  	h->access = *(products[prod_index].access);
  	/* Allow room for some ioctls */
  	h->nr_cmds = h->max_commands - 4;
  
  	if ((readb(&h->cfgtable->Signature[0]) != 'C') ||
  	    (readb(&h->cfgtable->Signature[1]) != 'I') ||
  	    (readb(&h->cfgtable->Signature[2]) != 'S') ||
  	    (readb(&h->cfgtable->Signature[3]) != 'S')) {
  		dev_warn(&pdev->dev, "not a valid CISS config table
  ");
  		err = -ENODEV;
  		goto err_out_free_res;
  	}
  #ifdef CONFIG_X86
  	{
  		/* Need to enable prefetch in the SCSI core for 6400 in x86 */

  		u32 prefetch;

  		prefetch = readl(&(h->cfgtable->SCSI_Prefetch));
  		prefetch |= 0x100;
  		writel(prefetch, &(h->cfgtable->SCSI_Prefetch));
  	}
  #endif
  
  	/* Disabling DMA prefetch for the P600
  	 * An ASIC bug may result in a prefetch beyond
  	 * physical memory.
  	 */
  	if (board_id == 0x3225103C) {

  		u32 dma_prefetch;

  		dma_prefetch = readl(h->vaddr + I2O_DMA1_CFG);
  		dma_prefetch |= 0x8000;
  		writel(dma_prefetch, h->vaddr + I2O_DMA1_CFG);
  	}
  
  	h->max_commands = readl(&(h->cfgtable->CmdsOutMax));
  	/* Update the field, and then ring the doorbell */
  	writel(CFGTBL_Trans_Simple, &(h->cfgtable->HostWrite.TransportRequest));
  	writel(CFGTBL_ChangeReq, h->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(h->vaddr + SA5_DOORBELL) & CFGTBL_ChangeReq))
  			break;
  		/* delay and try again */
  		msleep(10);
  	}
  
  #ifdef HPSA_DEBUG
  	print_cfg_table(&pdev->dev, h->cfgtable);
  #endif				/* HPSA_DEBUG */
  
  	if (!(readl(&(h->cfgtable->TransportActive)) & CFGTBL_Trans_Simple)) {
  		dev_warn(&pdev->dev, "unable to get board into simple mode
  ");
  		err = -ENODEV;
  		goto err_out_free_res;
  	}
  	return 0;
  
  err_out_free_res:
  	/*
  	 * Deliberately omit pci_disable_device(): it does something nasty to
  	 * Smart Array controllers that pci_enable_device does not undo
  	 */
  	pci_release_regions(pdev);
  	return err;
  }

  static void __devinit hpsa_hba_inquiry(struct ctlr_info *h)
  {
  	int rc;
  
  #define HBA_INQUIRY_BYTE_COUNT 64
  	h->hba_inquiry_data = kmalloc(HBA_INQUIRY_BYTE_COUNT, GFP_KERNEL);
  	if (!h->hba_inquiry_data)
  		return;
  	rc = hpsa_scsi_do_inquiry(h, RAID_CTLR_LUNID, 0,
  		h->hba_inquiry_data, HBA_INQUIRY_BYTE_COUNT);
  	if (rc != 0) {
  		kfree(h->hba_inquiry_data);
  		h->hba_inquiry_data = NULL;
  	}
  }

  static int __devinit hpsa_init_one(struct pci_dev *pdev,
  				    const struct pci_device_id *ent)
  {

  	int i, rc;

  	int dac;
  	struct ctlr_info *h;
  
  	if (number_of_controllers == 0)
  		printk(KERN_INFO DRIVER_NAME "
  ");
  	if (reset_devices) {
  		/* Reset the controller with a PCI power-cycle */
  		if (hpsa_hard_reset_controller(pdev) || hpsa_reset_msi(pdev))
  			return -ENODEV;
  
  		/* Some devices (notably the HP Smart Array 5i Controller)
  		   need a little pause here */
  		msleep(HPSA_POST_RESET_PAUSE_MSECS);
  
  		/* Now try to get the controller to respond to a no-op */
  		for (i = 0; i < HPSA_POST_RESET_NOOP_RETRIES; i++) {
  			if (hpsa_noop(pdev) == 0)
  				break;
  			else
  				dev_warn(&pdev->dev, "no-op failed%s
  ",
  						(i < 11 ? "; re-trying" : ""));
  		}
  	}

  	/* Command structures must be aligned on a 32-byte boundary because
  	 * the 5 lower bits of the address are used by the hardware. and by
  	 * the driver.  See comments in hpsa.h for more info.
  	 */
  #define COMMANDLIST_ALIGNMENT 32
  	BUILD_BUG_ON(sizeof(struct CommandList) % COMMANDLIST_ALIGNMENT);

  	h = kzalloc(sizeof(*h), GFP_KERNEL);
  	if (!h)

  		return -ENOMEM;

  
  	h->busy_initializing = 1;
  	INIT_HLIST_HEAD(&h->cmpQ);
  	INIT_HLIST_HEAD(&h->reqQ);

  	rc = hpsa_pci_init(h, pdev);
  	if (rc != 0)

  		goto clean1;
  
  	sprintf(h->devname, "hpsa%d", number_of_controllers);
  	h->ctlr = number_of_controllers;
  	number_of_controllers++;
  	h->pdev = pdev;
  
  	/* configure PCI DMA stuff */

  	rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
  	if (rc == 0) {

  		dac = 1;

  	} else {
  		rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
  		if (rc == 0) {
  			dac = 0;
  		} else {
  			dev_err(&pdev->dev, "no suitable DMA available
  ");
  			goto clean1;
  		}

  	}
  
  	/* make sure the board interrupts are off */
  	h->access.set_intr_mask(h, HPSA_INTR_OFF);

  	rc = request_irq(h->intr[PERF_MODE_INT], do_hpsa_intr,
  			IRQF_DISABLED, h->devname, h);

  	if (rc) {

  		dev_err(&pdev->dev, "unable to get irq %d for %s
  ",

  		       h->intr[PERF_MODE_INT], h->devname);

  		goto clean2;
  	}

  	dev_info(&pdev->dev, "%s: <0x%x> at IRQ %d%s using DAC
  ",
  	       h->devname, pdev->device,
  	       h->intr[PERF_MODE_INT], dac ? "" : " not");

  
  	h->cmd_pool_bits =
  	    kmalloc(((h->nr_cmds + BITS_PER_LONG -
  		      1) / BITS_PER_LONG) * sizeof(unsigned long), GFP_KERNEL);
  	h->cmd_pool = pci_alloc_consistent(h->pdev,
  		    h->nr_cmds * sizeof(*h->cmd_pool),
  		    &(h->cmd_pool_dhandle));
  	h->errinfo_pool = pci_alloc_consistent(h->pdev,
  		    h->nr_cmds * sizeof(*h->errinfo_pool),
  		    &(h->errinfo_pool_dhandle));
  	if ((h->cmd_pool_bits == NULL)
  	    || (h->cmd_pool == NULL)
  	    || (h->errinfo_pool == NULL)) {
  		dev_err(&pdev->dev, "out of memory");

  		rc = -ENOMEM;

  		goto clean4;
  	}

  	if (hpsa_allocate_sg_chain_blocks(h))
  		goto clean4;

  	spin_lock_init(&h->lock);

  	spin_lock_init(&h->scan_lock);
  	init_waitqueue_head(&h->scan_wait_queue);
  	h->scan_finished = 1; /* no scan currently in progress */

  
  	pci_set_drvdata(pdev, h);
  	memset(h->cmd_pool_bits, 0,
  	       ((h->nr_cmds + BITS_PER_LONG -
  		 1) / BITS_PER_LONG) * sizeof(unsigned long));
  
  	hpsa_scsi_setup(h);
  
  	/* Turn the interrupts on so we can service requests */
  	h->access.set_intr_mask(h, HPSA_INTR_ON);

  	hpsa_put_ctlr_into_performant_mode(h);

  	hpsa_hba_inquiry(h);

  	hpsa_register_scsi(h);	/* hook ourselves into SCSI subsystem */
  	h->busy_initializing = 0;
  	return 1;
  
  clean4:

  	hpsa_free_sg_chain_blocks(h);

  	kfree(h->cmd_pool_bits);
  	if (h->cmd_pool)
  		pci_free_consistent(h->pdev,
  			    h->nr_cmds * sizeof(struct CommandList),
  			    h->cmd_pool, h->cmd_pool_dhandle);
  	if (h->errinfo_pool)
  		pci_free_consistent(h->pdev,
  			    h->nr_cmds * sizeof(struct ErrorInfo),
  			    h->errinfo_pool,
  			    h->errinfo_pool_dhandle);

  	free_irq(h->intr[PERF_MODE_INT], h);

  clean2:
  clean1:
  	h->busy_initializing = 0;
  	kfree(h);

  	return rc;

  }
  
  static void hpsa_flush_cache(struct ctlr_info *h)
  {
  	char *flush_buf;
  	struct CommandList *c;
  
  	flush_buf = kzalloc(4, GFP_KERNEL);
  	if (!flush_buf)
  		return;
  
  	c = cmd_special_alloc(h);
  	if (!c) {
  		dev_warn(&h->pdev->dev, "cmd_special_alloc returned NULL!
  ");
  		goto out_of_memory;
  	}
  	fill_cmd(c, HPSA_CACHE_FLUSH, h, flush_buf, 4, 0,
  		RAID_CTLR_LUNID, TYPE_CMD);
  	hpsa_scsi_do_simple_cmd_with_retry(h, c, PCI_DMA_TODEVICE);
  	if (c->err_info->CommandStatus != 0)
  		dev_warn(&h->pdev->dev,
  			"error flushing cache on controller
  ");
  	cmd_special_free(h, c);
  out_of_memory:
  	kfree(flush_buf);
  }
  
  static void hpsa_shutdown(struct pci_dev *pdev)
  {
  	struct ctlr_info *h;
  
  	h = pci_get_drvdata(pdev);
  	/* 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
  	 */
  	hpsa_flush_cache(h);
  	h->access.set_intr_mask(h, HPSA_INTR_OFF);

  	free_irq(h->intr[PERF_MODE_INT], h);

  #ifdef CONFIG_PCI_MSI
  	if (h->msix_vector)
  		pci_disable_msix(h->pdev);
  	else if (h->msi_vector)
  		pci_disable_msi(h->pdev);
  #endif				/* CONFIG_PCI_MSI */
  }
  
  static void __devexit hpsa_remove_one(struct pci_dev *pdev)
  {
  	struct ctlr_info *h;
  
  	if (pci_get_drvdata(pdev) == NULL) {
  		dev_err(&pdev->dev, "unable to remove device 
  ");
  		return;
  	}
  	h = pci_get_drvdata(pdev);

  	hpsa_unregister_scsi(h);	/* unhook from SCSI subsystem */
  	hpsa_shutdown(pdev);
  	iounmap(h->vaddr);

  	hpsa_free_sg_chain_blocks(h);

  	pci_free_consistent(h->pdev,
  		h->nr_cmds * sizeof(struct CommandList),
  		h->cmd_pool, h->cmd_pool_dhandle);
  	pci_free_consistent(h->pdev,
  		h->nr_cmds * sizeof(struct ErrorInfo),
  		h->errinfo_pool, h->errinfo_pool_dhandle);

  	pci_free_consistent(h->pdev, h->reply_pool_size,
  		h->reply_pool, h->reply_pool_dhandle);

  	kfree(h->cmd_pool_bits);

  	kfree(h->blockFetchTable);

  	kfree(h->hba_inquiry_data);

  	/*
  	 * Deliberately omit pci_disable_device(): it does something nasty to
  	 * Smart Array controllers that pci_enable_device does not undo
  	 */
  	pci_release_regions(pdev);
  	pci_set_drvdata(pdev, NULL);

  	kfree(h);
  }
  
  static int hpsa_suspend(__attribute__((unused)) struct pci_dev *pdev,
  	__attribute__((unused)) pm_message_t state)
  {
  	return -ENOSYS;
  }
  
  static int hpsa_resume(__attribute__((unused)) struct pci_dev *pdev)
  {
  	return -ENOSYS;
  }
  
  static struct pci_driver hpsa_pci_driver = {
  	.name = "hpsa",
  	.probe = hpsa_init_one,
  	.remove = __devexit_p(hpsa_remove_one),
  	.id_table = hpsa_pci_device_id,	/* id_table */
  	.shutdown = hpsa_shutdown,
  	.suspend = hpsa_suspend,
  	.resume = hpsa_resume,
  };

  /* Fill in bucket_map[], given nsgs (the max number of
   * scatter gather elements supported) and bucket[],
   * which is an array of 8 integers.  The bucket[] array
   * contains 8 different DMA transfer sizes (in 16
   * byte increments) which the controller uses to fetch
   * commands.  This function fills in bucket_map[], which
   * maps a given number of scatter gather elements to one of
   * the 8 DMA transfer sizes.  The point of it is to allow the
   * controller to only do as much DMA as needed to fetch the
   * command, with the DMA transfer size encoded in the lower
   * bits of the command address.
   */
  static void  calc_bucket_map(int bucket[], int num_buckets,
  	int nsgs, int *bucket_map)
  {
  	int i, j, b, size;
  
  	/* even a command with 0 SGs requires 4 blocks */
  #define MINIMUM_TRANSFER_BLOCKS 4
  #define NUM_BUCKETS 8
  	/* Note, bucket_map must have nsgs+1 entries. */
  	for (i = 0; i <= nsgs; i++) {
  		/* Compute size of a command with i SG entries */
  		size = i + MINIMUM_TRANSFER_BLOCKS;
  		b = num_buckets; /* Assume the biggest bucket */
  		/* Find the bucket that is just big enough */
  		for (j = 0; j < 8; j++) {
  			if (bucket[j] >= size) {
  				b = j;
  				break;
  			}
  		}
  		/* for a command with i SG entries, use bucket b. */
  		bucket_map[i] = b;
  	}
  }
  
  static void hpsa_put_ctlr_into_performant_mode(struct ctlr_info *h)
  {
  	u32 trans_support;
  	u64 trans_offset;
  	/*  5 = 1 s/g entry or 4k
  	 *  6 = 2 s/g entry or 8k
  	 *  8 = 4 s/g entry or 16k
  	 * 10 = 6 s/g entry or 24k
  	 */
  	int bft[8] = {5, 6, 8, 10, 12, 20, 28, 35}; /* for scatter/gathers */
  	int i = 0;
  	int l = 0;
  	unsigned long register_value;
  
  	trans_support = readl(&(h->cfgtable->TransportSupport));
  	if (!(trans_support & PERFORMANT_MODE))
  		return;
  
  	h->max_commands = readl(&(h->cfgtable->MaxPerformantModeCommands));
  	h->max_sg_entries = 32;
  	/* Performant mode ring buffer and supporting data structures */
  	h->reply_pool_size = h->max_commands * sizeof(u64);
  	h->reply_pool = pci_alloc_consistent(h->pdev, h->reply_pool_size,
  				&(h->reply_pool_dhandle));
  
  	/* Need a block fetch table for performant mode */
  	h->blockFetchTable = kmalloc(((h->max_sg_entries+1) *
  				sizeof(u32)), GFP_KERNEL);
  
  	if ((h->reply_pool == NULL)
  		|| (h->blockFetchTable == NULL))
  		goto clean_up;
  
  	h->reply_pool_wraparound = 1; /* spec: init to 1 */
  
  	/* Controller spec: zero out this buffer. */
  	memset(h->reply_pool, 0, h->reply_pool_size);
  	h->reply_pool_head = h->reply_pool;
  
  	trans_offset = readl(&(h->cfgtable->TransMethodOffset));
  	bft[7] = h->max_sg_entries + 4;
  	calc_bucket_map(bft, ARRAY_SIZE(bft), 32, h->blockFetchTable);
  	for (i = 0; i < 8; i++)
  		writel(bft[i], &h->transtable->BlockFetch[i]);
  
  	/* size of controller ring buffer */
  	writel(h->max_commands, &h->transtable->RepQSize);
  	writel(1, &h->transtable->RepQCount);
  	writel(0, &h->transtable->RepQCtrAddrLow32);
  	writel(0, &h->transtable->RepQCtrAddrHigh32);
  	writel(h->reply_pool_dhandle, &h->transtable->RepQAddr0Low32);
  	writel(0, &h->transtable->RepQAddr0High32);
  	writel(CFGTBL_Trans_Performant,
  		&(h->cfgtable->HostWrite.TransportRequest));
  	writel(CFGTBL_ChangeReq, h->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 (l = 0; l < MAX_CONFIG_WAIT; l++) {
  		register_value = readl(h->vaddr + SA5_DOORBELL);
  		if (!(register_value & CFGTBL_ChangeReq))
  			break;
  		/* delay and try again */
  		set_current_state(TASK_INTERRUPTIBLE);
  		schedule_timeout(10);
  	}
  	register_value = readl(&(h->cfgtable->TransportActive));
  	if (!(register_value & CFGTBL_Trans_Performant)) {
  		dev_warn(&h->pdev->dev, "unable to get board into"
  					" performant mode
  ");
  		return;
  	}
  
  	/* Change the access methods to the performant access methods */
  	h->access = SA5_performant_access;
  	h->transMethod = CFGTBL_Trans_Performant;
  
  	return;
  
  clean_up:
  	if (h->reply_pool)
  		pci_free_consistent(h->pdev, h->reply_pool_size,
  			h->reply_pool, h->reply_pool_dhandle);
  	kfree(h->blockFetchTable);
  }

  /*
   *  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 hpsa_init(void)
  {

  	return pci_register_driver(&hpsa_pci_driver);

  }
  
  static void __exit hpsa_cleanup(void)
  {
  	pci_unregister_driver(&hpsa_pci_driver);

  }
  
  module_init(hpsa_init);
  module_exit(hpsa_cleanup);