hpsa.c

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/*
 *    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 [email protected]
 *
 */

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/pci-aspm.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/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 <linux/atomic.h>
#include <linux/kthread.h>
#include <linux/jiffies.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 ")"
#define HPSA "hpsa"

/* 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");
static int hpsa_simple_mode;
module_param(hpsa_simple_mode, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(hpsa_simple_mode,
    "Use 'simple mode' rather than 'performant mode'");

/* 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},
    {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSF,     0x103C, 0x3350},
    {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSF,     0x103C, 0x3351},
    {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSF,     0x103C, 0x3352},
    {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSF,     0x103C, 0x3353},
    {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSF,     0x103C, 0x3354},
    {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSF,     0x103C, 0x3355},
    {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSF,     0x103C, 0x3356},
    {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSH,     0x103C, 0x1920},
    {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSH,     0x103C, 0x1921},
    {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSH,     0x103C, 0x1922},
    {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSH,     0x103C, 0x1923},
    {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSH,     0x103C, 0x1924},
    {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSH,     0x103C, 0x1925},
    {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSH,     0x103C, 0x1926},
    {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSH,     0x103C, 0x1928},
    {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSF,     0x103C, 0x334d},
    {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},
    {0x3350103C, "Smart Array P222", &SA5_access},
    {0x3351103C, "Smart Array P420", &SA5_access},
    {0x3352103C, "Smart Array P421", &SA5_access},
    {0x3353103C, "Smart Array P822", &SA5_access},
    {0x3354103C, "Smart Array P420i", &SA5_access},
    {0x3355103C, "Smart Array P220i", &SA5_access},
    {0x3356103C, "Smart Array P721m", &SA5_access},
    {0x1920103C, "Smart Array", &SA5_access},
    {0x1921103C, "Smart Array", &SA5_access},
    {0x1922103C, "Smart Array", &SA5_access},
    {0x1923103C, "Smart Array", &SA5_access},
    {0x1924103C, "Smart Array", &SA5_access},
    {0x1925103C, "Smart Array", &SA5_access},
    {0x1926103C, "Smart Array", &SA5_access},
    {0x1928103C, "Smart Array", &SA5_access},
    {0x334d103C, "Smart Array P822se", &SA5_access},
    {0xFFFF103C, "Unknown Smart Array", &SA5_access},
};

static int number_of_controllers;

static struct list_head hpsa_ctlr_list = LIST_HEAD_INIT(hpsa_ctlr_list);
static spinlock_t lockup_detector_lock;
static struct task_struct *hpsa_lockup_detector;

static irqreturn_t do_hpsa_intr_intx(int irq, void *dev_id);
static irqreturn_t do_hpsa_intr_msi(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_Host *h, struct scsi_cmnd *cmd);
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_eh_abort_handler(struct scsi_cmnd *scsicmd);
static int hpsa_slave_alloc(struct scsi_device *sdev);
static void hpsa_slave_destroy(struct scsi_device *sdev);

static void hpsa_update_scsi_devices(struct ctlr_info *h, int hostno);
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 __devinit void hpsa_put_ctlr_into_performant_mode(struct ctlr_info *h);
static inline u32 next_command(struct ctlr_info *h, u8 q);
static int __devinit hpsa_find_cfg_addrs(struct pci_dev *pdev,
    void __iomem *vaddr, u32 *cfg_base_addr, u64 *cfg_base_addr_index,
    u64 *cfg_offset);
static int __devinit hpsa_pci_find_memory_BAR(struct pci_dev *pdev,
    unsigned long *memory_bar);
static int __devinit hpsa_lookup_board_id(struct pci_dev *pdev, u32 *board_id);
static int __devinit hpsa_wait_for_board_state(struct pci_dev *pdev,
    void __iomem *vaddr, int wait_for_ready);
static inline void finish_cmd(struct CommandList *c);
#define BOARD_NOT_READY 0
#define BOARD_READY 1

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\n", h->ctlr);
        break;
    case LUN_FAILED:
        dev_warn(&h->pdev->dev, HPSA "%d: LUN failure "
            "detected, action required\n", h->ctlr);
        break;
    case REPORT_LUNS_CHANGED:
        dev_warn(&h->pdev->dev, HPSA "%d: report LUN data "
            "changed, action required\n", h->ctlr);
    /*
     * Note: this REPORT_LUNS_CHANGED condition only occurs on the external
     * target (array) devices.
     */
        break;
    case POWER_OR_RESET:
        dev_warn(&h->pdev->dev, HPSA "%d: a power on "
            "or device reset detected\n", h->ctlr);
        break;
    case UNIT_ATTENTION_CLEARED:
        dev_warn(&h->pdev->dev, HPSA "%d: unit attention "
            "cleared by another initiator\n", h->ctlr);
        break;
    default:
        dev_warn(&h->pdev->dev, HPSA "%d: unknown "
            "unit attention detected\n", h->ctlr);
        break;
    }
    return 1;
}

static int check_for_busy(struct ctlr_info *h, struct CommandList *c)
{
    if (c->err_info->CommandStatus != CMD_TARGET_STATUS ||
        (c->err_info->ScsiStatus != SAM_STAT_BUSY &&
         c->err_info->ScsiStatus != SAM_STAT_TASK_SET_FULL))
        return 0;
    dev_warn(&h->pdev->dev, HPSA "device busy");
    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;
}

static ssize_t host_show_firmware_revision(struct device *dev,
         struct device_attribute *attr, char *buf)
{
    struct ctlr_info *h;
    struct Scsi_Host *shost = class_to_shost(dev);
    unsigned char *fwrev;

    h = shost_to_hba(shost);
    if (!h->hba_inquiry_data)
        return 0;
    fwrev = &h->hba_inquiry_data[32];
    return snprintf(buf, 20, "%c%c%c%c\n",
        fwrev[0], fwrev[1], fwrev[2], fwrev[3]);
}

static ssize_t host_show_commands_outstanding(struct device *dev,
         struct device_attribute *attr, char *buf)
{
    struct Scsi_Host *shost = class_to_shost(dev);
    struct ctlr_info *h = shost_to_hba(shost);

    return snprintf(buf, 20, "%d\n", h->commands_outstanding);
}

static ssize_t host_show_transport_mode(struct device *dev,
    struct device_attribute *attr, char *buf)
{
    struct ctlr_info *h;
    struct Scsi_Host *shost = class_to_shost(dev);

    h = shost_to_hba(shost);
    return snprintf(buf, 20, "%s\n",
        h->transMethod & CFGTBL_Trans_Performant ?
            "performant" : "simple");
}

/* List of controllers which cannot be hard reset on kexec with reset_devices */
static u32 unresettable_controller[] = {
    0x324a103C, /* Smart Array P712m */
    0x324b103C, /* SmartArray P711m */
    0x3223103C, /* Smart Array P800 */
    0x3234103C, /* Smart Array P400 */
    0x3235103C, /* Smart Array P400i */
    0x3211103C, /* Smart Array E200i */
    0x3212103C, /* Smart Array E200 */
    0x3213103C, /* Smart Array E200i */
    0x3214103C, /* Smart Array E200i */
    0x3215103C, /* Smart Array E200i */
    0x3237103C, /* Smart Array E500 */
    0x323D103C, /* Smart Array P700m */
    0x40800E11, /* Smart Array 5i */
    0x409C0E11, /* Smart Array 6400 */
    0x409D0E11, /* Smart Array 6400 EM */
    0x40700E11, /* Smart Array 5300 */
    0x40820E11, /* Smart Array 532 */
    0x40830E11, /* Smart Array 5312 */
    0x409A0E11, /* Smart Array 641 */
    0x409B0E11, /* Smart Array 642 */
    0x40910E11, /* Smart Array 6i */
};

/* List of controllers which cannot even be soft reset */
static u32 soft_unresettable_controller[] = {
    0x40800E11, /* Smart Array 5i */
    0x40700E11, /* Smart Array 5300 */
    0x40820E11, /* Smart Array 532 */
    0x40830E11, /* Smart Array 5312 */
    0x409A0E11, /* Smart Array 641 */
    0x409B0E11, /* Smart Array 642 */
    0x40910E11, /* Smart Array 6i */
    /* Exclude 640x boards.  These are two pci devices in one slot
     * which share a battery backed cache module.  One controls the
     * cache, the other accesses the cache through the one that controls
     * it.  If we reset the one controlling the cache, the other will
     * likely not be happy.  Just forbid resetting this conjoined mess.
     * The 640x isn't really supported by hpsa anyway.
     */
    0x409C0E11, /* Smart Array 6400 */
    0x409D0E11, /* Smart Array 6400 EM */
};

static int ctlr_is_hard_resettable(u32 board_id)
{
    int i;

    for (i = 0; i < ARRAY_SIZE(unresettable_controller); i++)
        if (unresettable_controller[i] == board_id)
            return 0;
    return 1;
}

static int ctlr_is_soft_resettable(u32 board_id)
{
    int i;

    for (i = 0; i < ARRAY_SIZE(soft_unresettable_controller); i++)
        if (soft_unresettable_controller[i] == board_id)
            return 0;
    return 1;
}

static int ctlr_is_resettable(u32 board_id)
{
    return ctlr_is_hard_resettable(board_id) ||
        ctlr_is_soft_resettable(board_id);
}

static ssize_t host_show_resettable(struct device *dev,
    struct device_attribute *attr, char *buf)
{
    struct ctlr_info *h;
    struct Scsi_Host *shost = class_to_shost(dev);

    h = shost_to_hba(shost);
    return snprintf(buf, 20, "%d\n", ctlr_is_resettable(h->board_id));
}

static inline int is_logical_dev_addr_mode(unsigned char scsi3addr[])
{
    return (scsi3addr[3] & 0xC0) == 0x40;
}

static const char *raid_label[] = { "0", "4", "1(1+0)", "5", "5+1", "ADG",
    "1(ADM)", "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\n");
        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\n", 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\n",
        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\n",
            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 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 DEVICE_ATTR(firmware_revision, S_IRUGO,
    host_show_firmware_revision, NULL);
static DEVICE_ATTR(commands_outstanding, S_IRUGO,
    host_show_commands_outstanding, NULL);
static DEVICE_ATTR(transport_mode, S_IRUGO,
    host_show_transport_mode, NULL);
static DEVICE_ATTR(resettable, S_IRUGO,
    host_show_resettable, NULL);

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,
    &dev_attr_firmware_revision,
    &dev_attr_commands_outstanding,
    &dev_attr_transport_mode,
    &dev_attr_resettable,
    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_abort_handler   = hpsa_eh_abort_handler,
    .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,
    .max_sectors = 8192,
};


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

static inline u32 next_command(struct ctlr_info *h, u8 q)
{
    u32 a;
    struct reply_pool *rq = &h->reply_queue[q];
    unsigned long flags;

    if (unlikely(!(h->transMethod & CFGTBL_Trans_Performant)))
        return h->access.command_completed(h, q);

    if ((rq->head[rq->current_entry] & 1) == rq->wraparound) {
        a = rq->head[rq->current_entry];
        rq->current_entry++;
        spin_lock_irqsave(&h->lock, flags);
        h->commands_outstanding--;
        spin_unlock_irqrestore(&h->lock, flags);
    } else {
        a = FIFO_EMPTY;
    }
    /* Check for wraparound */
    if (rq->current_entry == h->max_commands) {
        rq->current_entry = 0;
        rq->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);
        if (likely(h->msix_vector))
            c->Header.ReplyQueue =
                smp_processor_id() % h->nreply_queues;
    }
}

static int is_firmware_flash_cmd(u8 *cdb)
{
    return cdb[0] == BMIC_WRITE && cdb[6] == BMIC_FLASH_FIRMWARE;
}

/*
 * During firmware flash, the heartbeat register may not update as frequently
 * as it should.  So we dial down lockup detection during firmware flash. and
 * dial it back up when firmware flash completes.
 */
#define HEARTBEAT_SAMPLE_INTERVAL_DURING_FLASH (240 * HZ)
#define HEARTBEAT_SAMPLE_INTERVAL (30 * HZ)
static void dial_down_lockup_detection_during_fw_flash(struct ctlr_info *h,
        struct CommandList *c)
{
    if (!is_firmware_flash_cmd(c->Request.CDB))
        return;
    atomic_inc(&h->firmware_flash_in_progress);
    h->heartbeat_sample_interval = HEARTBEAT_SAMPLE_INTERVAL_DURING_FLASH;
}

static void dial_up_lockup_detection_on_fw_flash_complete(struct ctlr_info *h,
        struct CommandList *c)
{
    if (is_firmware_flash_cmd(c->Request.CDB) &&
        atomic_dec_and_test(&h->firmware_flash_in_progress))
        h->heartbeat_sample_interval = HEARTBEAT_SAMPLE_INTERVAL;
}

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

    set_performant_mode(h, c);
    dial_down_lockup_detection_during_fw_flash(h, c);
    spin_lock_irqsave(&h->lock, flags);
    addQ(&h->reqQ, c);
    h->Qdepth++;
    spin_unlock_irqrestore(&h->lock, flags);
    start_io(h);
}

static inline void removeQ(struct CommandList *c)
{
    if (WARN_ON(list_empty(&c->list)))
        return;
    list_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_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 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_DEVICES);

    bitmap_zero(lun_taken, HPSA_MAX_DEVICES);

    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);
    }

    i = find_first_zero_bit(lun_taken, HPSA_MAX_DEVICES);
    if (i < HPSA_MAX_DEVICES) {
        /* *bus = 1; */
        *target = i;
        *lun = 0;
        found = 1;
    }
    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_DEVICES) {
        dev_err(&h->pdev->dev, "too many devices, some will be "
            "inaccessible.\n");
        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.\n");
            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.\n",
            scsi_device_type(device->devtype), hostno,
            device->bus, device->target, device->lun);
    return 0;
}

/* Update an entry in h->dev[] array. */
static void hpsa_scsi_update_entry(struct ctlr_info *h, int hostno,
    int entry, struct hpsa_scsi_dev_t *new_entry)
{
    /* assumes h->devlock is held */
    BUG_ON(entry < 0 || entry >= HPSA_MAX_DEVICES);

    /* Raid level changed. */
    h->dev[entry]->raid_level = new_entry->raid_level;
    dev_info(&h->pdev->dev, "%s device c%db%dt%dl%d updated.\n",
        scsi_device_type(new_entry->devtype), hostno, new_entry->bus,
        new_entry->target, new_entry->lun);
}

/* 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_DEVICES);
    removed[*nremoved] = h->dev[entry];
    (*nremoved)++;

    /*
     * New physical devices won't have target/lun assigned yet
     * so we need to preserve the values in the slot we are replacing.
     */
    if (new_entry->target == -1) {
        new_entry->target = h->dev[entry]->target;
        new_entry->lun = h->dev[entry]->lun;
    }

    h->dev[entry] = new_entry;
    added[*nadded] = new_entry;
    (*nadded)++;
    dev_info(&h->pdev->dev, "%s device c%db%dt%dl%d changed.\n",
        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_DEVICES);

    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.\n",
        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)
{
    /* 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 (dev1->devtype != dev2->devtype)
        return 0;
    if (dev1->bus != dev2->bus)
        return 0;
    return 1;
}

static inline int device_updated(struct hpsa_scsi_dev_t *dev1,
    struct hpsa_scsi_dev_t *dev2)
{
    /* Device attributes that can change, but don't mean
     * that the device is a different device, nor that the OS
     * needs to be told anything about the change.
     */
    if (dev1->raid_level != dev2->raid_level)
        return 1;
    return 0;
}

/* 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.
 * In the case of a minor device attribute change, such as RAID level, just
 * return DEVICE_UPDATED, along with the updated device's 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
#define DEVICE_UPDATED 3
    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])) {
                if (device_updated(needle, haystack[i]))
                    return DEVICE_UPDATED;
                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_DEVICES, GFP_KERNEL);
    removed = kzalloc(sizeof(*removed) * HPSA_MAX_DEVICES, GFP_KERNEL);

    if (!added || !removed) {
        dev_warn(&h->pdev->dev, "out of memory in "
            "adjust_hpsa_scsi_table\n");
        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.
     * If minor device attributes change, just update
     * the existing device structure.
     */
    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;
        } else if (device_change == DEVICE_UPDATED) {
            hpsa_scsi_update_entry(h, hostno, i, sd[entry]);
        }
        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.\n");
            /* 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.\n", 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_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)
{
    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 */
    unsigned long sense_data_size;

    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. */
    if (SCSI_SENSE_BUFFERSIZE < sizeof(ei->SenseInfo))
        sense_data_size = SCSI_SENSE_BUFFERSIZE;
    else
        sense_data_size = sizeof(ei->SenseInfo);
    if (ei->SenseLen < sense_data_size)
        sense_data_size = ei->SenseLen;

    memcpy(cmd->sense_buffer, ei->SenseInfo, sense_data_size);
    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\n", 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\n", 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\n",
                    cp, asc, ascq);
                cmd->result = DID_SOFT_ERROR << 16;
                break;
            }
            /* Must be some other type of check condition */
            dev_dbg(&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]\n",
                    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\n",
                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.\n", 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\n", 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:
        cmd->result = DID_ERROR << 16;
        dev_warn(&h->pdev->dev, "cp %p has "
            "protocol error\n", cp);
        break;
    case CMD_HARDWARE_ERR:
        cmd->result = DID_ERROR << 16;
        dev_warn(&h->pdev->dev, "cp %p had  hardware error\n", cp);
        break;
    case CMD_CONNECTION_LOST:
        cmd->result = DID_ERROR << 16;
        dev_warn(&h->pdev->dev, "cp %p had connection lost\n", cp);
        break;
    case CMD_ABORTED:
        cmd->result = DID_ABORT << 16;
        dev_warn(&h->pdev->dev, "cp %p was aborted with status 0x%x\n",
                cp, ei->ScsiStatus);
        break;
    case CMD_ABORT_FAILED:
        cmd->result = DID_ERROR << 16;
        dev_warn(&h->pdev->dev, "cp %p reports abort failed\n", cp);
        break;
    case CMD_UNSOLICITED_ABORT:
        cmd->result = DID_SOFT_ERROR << 16; /* retry the command */
        dev_warn(&h->pdev->dev, "cp %p aborted due to an unsolicited "
            "abort\n", cp);
        break;
    case CMD_TIMEOUT:
        cmd->result = DID_TIME_OUT << 16;
        dev_warn(&h->pdev->dev, "cp %p timedout\n", cp);
        break;
    case CMD_UNABORTABLE:
        cmd->result = DID_ERROR << 16;
        dev_warn(&h->pdev->dev, "Command unabortable\n");
        break;
    default:
        cmd->result = DID_ERROR << 16;
        dev_warn(&h->pdev->dev, "cp %p returned unknown status %x\n",
                cp, ei->CommandStatus);
    }
    cmd->scsi_done(cmd);
    cmd_free(h, cp);
}

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_core_if_no_lockup(struct ctlr_info *h,
    struct CommandList *c)
{
    unsigned long flags;

    /* If controller lockup detected, fake a hardware error. */
    spin_lock_irqsave(&h->lock, flags);
    if (unlikely(h->lockup_detected)) {
        spin_unlock_irqrestore(&h->lock, flags);
        c->err_info->CommandStatus = CMD_HARDWARE_ERR;
    } else {
        spin_unlock_irqrestore(&h->lock, flags);
        hpsa_scsi_do_simple_cmd_core(h, c);
    }
}

#define MAX_DRIVER_CMD_RETRIES 25
static void hpsa_scsi_do_simple_cmd_with_retry(struct ctlr_info *h,
    struct CommandList *c, int data_direction)
{
    int backoff_time = 10, retry_count = 0;

    do {
        memset(c->err_info, 0, sizeof(*c->err_info));
        hpsa_scsi_do_simple_cmd_core(h, c);
        retry_count++;
        if (retry_count > 3) {
            msleep(backoff_time);
            if (backoff_time < 1000)
                backoff_time *= 2;
        }
    } while ((check_for_unit_attention(h, c) ||
            check_for_busy(h, c)) &&
            retry_count <= MAX_DRIVER_CMD_RETRIES);
    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\n", cp);
        dev_warn(d, "cmd %p has SCSI Status = %x\n", 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.)\n");
        break;
    case CMD_DATA_UNDERRUN: /* let mid layer handle it. */
            dev_info(d, "UNDERRUN\n");
        break;
    case CMD_DATA_OVERRUN:
        dev_warn(d, "cp %p has completed with data overrun\n", 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)\n", 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 \n", cp);
        break;
    case CMD_HARDWARE_ERR:
        /* cmd->result = DID_ERROR << 16; */
        dev_warn(d, "cp %p had hardware error\n", cp);
        break;
    case CMD_CONNECTION_LOST:
        dev_warn(d, "cp %p had connection lost\n", cp);
        break;
    case CMD_ABORTED:
        dev_warn(d, "cp %p was aborted\n", cp);
        break;
    case CMD_ABORT_FAILED:
        dev_warn(d, "cp %p reports abort failed\n", cp);
        break;
    case CMD_UNSOLICITED_ABORT:
        dev_warn(d, "cp %p aborted due to an unsolicited abort\n", cp);
        break;
    case CMD_TIMEOUT:
        dev_warn(d, "cp %p timed out\n", cp);
        break;
    case CMD_UNABORTABLE:
        dev_warn(d, "Command unabortable\n");
        break;
    default:
        dev_warn(d, "cp %p returned unknown status %x\n", 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!\n");
        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!\n");
        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!\n");
        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,
    unsigned char *is_OBDR_device)
{

#define OBDR_SIG_OFFSET 43
#define OBDR_TAPE_SIG "$DR-10"
#define OBDR_SIG_LEN (sizeof(OBDR_TAPE_SIG) - 1)
#define OBDR_TAPE_INQ_SIZE (OBDR_SIG_OFFSET + OBDR_SIG_LEN)

    unsigned char *inq_buff;
    unsigned char *obdr_sig;

    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\n");
        goto bail_out;
    }

    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));
    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;

    if (is_OBDR_device) {
        /* See if this is a One-Button-Disaster-Recovery device
         * by looking for "$DR-10" at offset 43 in inquiry data.
         */
        obdr_sig = &inq_buff[OBDR_SIG_OFFSET];
        *is_OBDR_device = (this_device->devtype == TYPE_ROM &&
                    strncmp(obdr_sig, OBDR_TAPE_SIG,
                        OBDR_SIG_LEN) == 0);
    }

    kfree(inq_buff);
    return 0;

bail_out:
    kfree(inq_buff);
    return 1;
}

static unsigned char *ext_target_model[] = {
    "MSA2012",
    "MSA2024",
    "MSA2312",
    "MSA2324",
    "P2000 G3 SAS",
    NULL,
};

static int is_ext_target(struct ctlr_info *h, struct hpsa_scsi_dev_t *device)
{
    int i;

    for (i = 0; ext_target_model[i]; i++)
        if (strncmp(device->model, ext_target_model[i],
            strlen(ext_target_model[i])) == 0)
            return 1;
    return 0;
}

/* Helper function to assign bus, target, lun mapping of devices.
 * Puts non-external target logical volumes on bus 0, external target 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, struct hpsa_scsi_dev_t *device)
{
    u32 lunid = le32_to_cpu(*((__le32 *) lunaddrbytes));

    if (!is_logical_dev_addr_mode(lunaddrbytes)) {
        /* physical device, target and lun filled in later */
        if (is_hba_lunid(lunaddrbytes))
            hpsa_set_bus_target_lun(device, 3, 0, lunid & 0x3fff);
        else
            /* defer target, lun assignment for physical devices */
            hpsa_set_bus_target_lun(device, 2, -1, -1);
        return;
    }
    /* It's a logical device */
    if (is_ext_target(h, device)) {
        /* external target way, put logicals on bus 1
         * and match target/lun numbers box
         * reports, other smart array, bus 0, target 0, match lunid
         */
        hpsa_set_bus_target_lun(device,
            1, (lunid >> 16) & 0x3fff, lunid & 0x00ff);
        return;
    }
    hpsa_set_bus_target_lun(device, 0, 0, lunid & 0x3fff);
}

/*
 * If there is no lun 0 on a target, linux won't find any devices.
 * For the external targets (arrays), 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_ext_target_dev(struct ctlr_info *h,
    struct hpsa_scsi_dev_t *tmpdevice,
    struct hpsa_scsi_dev_t *this_device, u8 *lunaddrbytes,
    unsigned long lunzerobits[], int *n_ext_target_devs)
{
    unsigned char scsi3addr[8];

    if (test_bit(tmpdevice->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_ext_target(h, tmpdevice))
        return 0; /* Only external target devices have this problem. */

    if (tmpdevice->lun == 0) /* if lun is 0, then we have a lun 0. */
        return 0;

    memset(scsi3addr, 0, 8);
    scsi3addr[3] = tmpdevice->target;
    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. */

    if (*n_ext_target_devs >= MAX_EXT_TARGETS) {
        dev_warn(&h->pdev->dev, "Maximum number of external "
            "target devices exceeded.  Check your hardware "
            "configuration.");
        return 0;
    }

    if (hpsa_update_device_info(h, scsi3addr, this_device, NULL))
        return 0;
    (*n_ext_target_devs)++;
    hpsa_set_bus_target_lun(this_device,
                tmpdevice->bus, tmpdevice->target, 0);
    set_bit(tmpdevice->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.\n");
        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.\n", 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.\n");
        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.\n", 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.\n", 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;
    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, n_ext_target_devs, ndevs_to_allocate;
    int raid_ctlr_position;
    DECLARE_BITMAP(lunzerobits, MAX_EXT_TARGETS);

    currentsd = kzalloc(sizeof(*currentsd) * HPSA_MAX_DEVICES, GFP_KERNEL);
    physdev_list = kzalloc(reportlunsize, GFP_KERNEL);
    logdev_list = kzalloc(reportlunsize, GFP_KERNEL);
    tmpdevice = kzalloc(sizeof(*tmpdevice), GFP_KERNEL);

    if (!currentsd || !physdev_list || !logdev_list || !tmpdevice) {
        dev_err(&h->pdev->dev, "out of memory\n");
        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 the maximum number of logical and physical disks
     * plus external target devices, and a device for the local RAID
     * controller.
     */
    ndevs_to_allocate = nphysicals + nlogicals + MAX_EXT_TARGETS + 1;

    /* Allocate the per device structures */
    for (i = 0; i < ndevs_to_allocate; i++) {
        if (i >= HPSA_MAX_DEVICES) {
            dev_warn(&h->pdev->dev, "maximum devices (%d) exceeded."
                "  %d devices ignored.\n", HPSA_MAX_DEVICES,
                ndevs_to_allocate - HPSA_MAX_DEVICES);
            break;
        }

        currentsd[i] = kzalloc(sizeof(*currentsd[i]), GFP_KERNEL);
        if (!currentsd[i]) {
            dev_warn(&h->pdev->dev, "out of memory at %s:%d\n",
                __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 */
    n_ext_target_devs = 0;
    for (i = 0; i < nphysicals + nlogicals + 1; i++) {
        u8 *lunaddrbytes, is_OBDR = 0;

        /* 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,
                            &is_OBDR))
            continue; /* skip it if we can't talk to it. */
        figure_bus_target_lun(h, lunaddrbytes, tmpdevice);
        this_device = currentsd[ncurrent];

        /*
         * For external target devices, 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_ext_target_dev(h, tmpdevice, this_device,
                lunaddrbytes, lunzerobits,
                &n_ext_target_devs)) {
            ncurrent++;
            this_device = currentsd[ncurrent];
        }

        *this_device = *tmpdevice;

        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.
             */
            if (is_OBDR)
                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_DEVICES)
            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(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_lck(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));

    spin_lock_irqsave(&h->lock, flags);
    if (unlikely(h->lockup_detected)) {
        spin_unlock_irqrestore(&h->lock, flags);
        cmd->result = DID_ERROR << 16;
        done(cmd);
        return 0;
    }
    spin_unlock_irqrestore(&h->lock, flags);
    c = cmd_alloc(h);
    if (c == NULL) {            /* trouble... */
        dev_err(&h->pdev->dev, "cmd_alloc returned NULL!\n");
        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\n",
            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 DEF_SCSI_QCMD(hpsa_scsi_queue_command)

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)
{
    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[h->intr_mode];
    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, "%s: scsi_add_host"
        " failed for controller %d\n", __func__, h->ctlr);
    scsi_host_put(sh);
    return error;
 fail:
    dev_err(&h->pdev->dev, "%s: scsi_host_alloc"
        " failed for controller %d\n", __func__, h->ctlr);
    return -ENOMEM;
}

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.\n");
        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.\n", waittime);
        rc = 1; /* device not ready. */
    }

    if (rc)
        dev_warn(&h->pdev->dev, "giving up on device.\n");
    else
        dev_warn(&h->pdev->dev, "device is ready.\n");

    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.\n");
        return FAILED;
    }
    dev_warn(&h->pdev->dev, "resetting device %d:%d:%d:%d\n",
        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.\n");
    return FAILED;
}

static void swizzle_abort_tag(u8 *tag)
{
    u8 original_tag[8];

    memcpy(original_tag, tag, 8);
    tag[0] = original_tag[3];
    tag[1] = original_tag[2];
    tag[2] = original_tag[1];
    tag[3] = original_tag[0];
    tag[4] = original_tag[7];
    tag[5] = original_tag[6];
    tag[6] = original_tag[5];
    tag[7] = original_tag[4];
}

static int hpsa_send_abort(struct ctlr_info *h, unsigned char *scsi3addr,
    struct CommandList *abort, int swizzle)
{
    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!\n");
        return -ENOMEM;
    }

    fill_cmd(c, HPSA_ABORT_MSG, h, abort, 0, 0, scsi3addr, TYPE_MSG);
    if (swizzle)
        swizzle_abort_tag(&c->Request.CDB[4]);
    hpsa_scsi_do_simple_cmd_core(h, c);
    dev_dbg(&h->pdev->dev, "%s: Tag:0x%08x:%08x: do_simple_cmd_core completed.\n",
        __func__, abort->Header.Tag.upper, abort->Header.Tag.lower);
    /* no unmap needed here because no data xfer. */

    ei = c->err_info;
    switch (ei->CommandStatus) {
    case CMD_SUCCESS:
        break;
    case CMD_UNABORTABLE: /* Very common, don't make noise. */
        rc = -1;
        break;
    default:
        dev_dbg(&h->pdev->dev, "%s: Tag:0x%08x:%08x: interpreting error.\n",
            __func__, abort->Header.Tag.upper,
            abort->Header.Tag.lower);
        hpsa_scsi_interpret_error(c);
        rc = -1;
        break;
    }
    cmd_special_free(h, c);
    dev_dbg(&h->pdev->dev, "%s: Tag:0x%08x:%08x: Finished.\n", __func__,
        abort->Header.Tag.upper, abort->Header.Tag.lower);
    return rc;
}

/*
 * hpsa_find_cmd_in_queue
 *
 * Used to determine whether a command (find) is still present
 * in queue_head.   Optionally excludes the last element of queue_head.
 *
 * This is used to avoid unnecessary aborts.  Commands in h->reqQ have
 * not yet been submitted, and so can be aborted by the driver without
 * sending an abort to the hardware.
 *
 * Returns pointer to command if found in queue, NULL otherwise.
 */
static struct CommandList *hpsa_find_cmd_in_queue(struct ctlr_info *h,
            struct scsi_cmnd *find, struct list_head *queue_head)
{
    unsigned long flags;
    struct CommandList *c = NULL;   /* ptr into cmpQ */

    if (!find)
        return 0;
    spin_lock_irqsave(&h->lock, flags);
    list_for_each_entry(c, queue_head, list) {
        if (c->scsi_cmd == NULL) /* e.g.: passthru ioctl */
            continue;
        if (c->scsi_cmd == find) {
            spin_unlock_irqrestore(&h->lock, flags);
            return c;
        }
    }
    spin_unlock_irqrestore(&h->lock, flags);
    return NULL;
}

static struct CommandList *hpsa_find_cmd_in_queue_by_tag(struct ctlr_info *h,
                    u8 *tag, struct list_head *queue_head)
{
    unsigned long flags;
    struct CommandList *c;

    spin_lock_irqsave(&h->lock, flags);
    list_for_each_entry(c, queue_head, list) {
        if (memcmp(&c->Header.Tag, tag, 8) != 0)
            continue;
        spin_unlock_irqrestore(&h->lock, flags);
        return c;
    }
    spin_unlock_irqrestore(&h->lock, flags);
    return NULL;
}

/* Some Smart Arrays need the abort tag swizzled, and some don't.  It's hard to
 * tell which kind we're dealing with, so we send the abort both ways.  There
 * shouldn't be any collisions between swizzled and unswizzled tags due to the
 * way we construct our tags but we check anyway in case the assumptions which
 * make this true someday become false.
 */
static int hpsa_send_abort_both_ways(struct ctlr_info *h,
    unsigned char *scsi3addr, struct CommandList *abort)
{
    u8 swizzled_tag[8];
    struct CommandList *c;
    int rc = 0, rc2 = 0;

    /* we do not expect to find the swizzled tag in our queue, but
     * check anyway just to be sure the assumptions which make this
     * the case haven't become wrong.
     */
    memcpy(swizzled_tag, &abort->Request.CDB[4], 8);
    swizzle_abort_tag(swizzled_tag);
    c = hpsa_find_cmd_in_queue_by_tag(h, swizzled_tag, &h->cmpQ);
    if (c != NULL) {
        dev_warn(&h->pdev->dev, "Unexpectedly found byte-swapped tag in completion queue.\n");
        return hpsa_send_abort(h, scsi3addr, abort, 0);
    }
    rc = hpsa_send_abort(h, scsi3addr, abort, 0);

    /* if the command is still in our queue, we can't conclude that it was
     * aborted (it might have just completed normally) but in any case
     * we don't need to try to abort it another way.
     */
    c = hpsa_find_cmd_in_queue(h, abort->scsi_cmd, &h->cmpQ);
    if (c)
        rc2 = hpsa_send_abort(h, scsi3addr, abort, 1);
    return rc && rc2;
}

/* Send an abort for the specified command.
 *  If the device and controller support it,
 *      send a task abort request.
 */
static int hpsa_eh_abort_handler(struct scsi_cmnd *sc)
{

    int i, rc;
    struct ctlr_info *h;
    struct hpsa_scsi_dev_t *dev;
    struct CommandList *abort; /* pointer to command to be aborted */
    struct CommandList *found;
    struct scsi_cmnd *as;   /* ptr to scsi cmd inside aborted command. */
    char msg[256];      /* For debug messaging. */
    int ml = 0;

    /* Find the controller of the command to be aborted */
    h = sdev_to_hba(sc->device);
    if (WARN(h == NULL,
            "ABORT REQUEST FAILED, Controller lookup failed.\n"))
        return FAILED;

    /* Check that controller supports some kind of task abort */
    if (!(HPSATMF_PHYS_TASK_ABORT & h->TMFSupportFlags) &&
        !(HPSATMF_LOG_TASK_ABORT & h->TMFSupportFlags))
        return FAILED;

    memset(msg, 0, sizeof(msg));
    ml += sprintf(msg+ml, "ABORT REQUEST on C%d:B%d:T%d:L%d ",
        h->scsi_host->host_no, sc->device->channel,
        sc->device->id, sc->device->lun);

    /* Find the device of the command to be aborted */
    dev = sc->device->hostdata;
    if (!dev) {
        dev_err(&h->pdev->dev, "%s FAILED, Device lookup failed.\n",
                msg);
        return FAILED;
    }

    /* Get SCSI command to be aborted */
    abort = (struct CommandList *) sc->host_scribble;
    if (abort == NULL) {
        dev_err(&h->pdev->dev, "%s FAILED, Command to abort is NULL.\n",
                msg);
        return FAILED;
    }

    ml += sprintf(msg+ml, "Tag:0x%08x:%08x ",
        abort->Header.Tag.upper, abort->Header.Tag.lower);
    as  = (struct scsi_cmnd *) abort->scsi_cmd;
    if (as != NULL)
        ml += sprintf(msg+ml, "Command:0x%x SN:0x%lx ",
            as->cmnd[0], as->serial_number);
    dev_dbg(&h->pdev->dev, "%s\n", msg);
    dev_warn(&h->pdev->dev, "Abort request on C%d:B%d:T%d:L%d\n",
        h->scsi_host->host_no, dev->bus, dev->target, dev->lun);

    /* Search reqQ to See if command is queued but not submitted,
     * if so, complete the command with aborted status and remove
     * it from the reqQ.
     */
    found = hpsa_find_cmd_in_queue(h, sc, &h->reqQ);
    if (found) {
        found->err_info->CommandStatus = CMD_ABORTED;
        finish_cmd(found);
        dev_info(&h->pdev->dev, "%s Request SUCCEEDED (driver queue).\n",
                msg);
        return SUCCESS;
    }

    /* not in reqQ, if also not in cmpQ, must have already completed */
    found = hpsa_find_cmd_in_queue(h, sc, &h->cmpQ);
    if (!found)  {
        dev_dbg(&h->pdev->dev, "%s Request SUCCEEDED (not known to driver).\n",
                msg);
        return SUCCESS;
    }

    /*
     * Command is in flight, or possibly already completed
     * by the firmware (but not to the scsi mid layer) but we can't
     * distinguish which.  Send the abort down.
     */
    rc = hpsa_send_abort_both_ways(h, dev->scsi3addr, abort);
    if (rc != 0) {
        dev_dbg(&h->pdev->dev, "%s Request FAILED.\n", msg);
        dev_warn(&h->pdev->dev, "FAILED abort on device C%d:B%d:T%d:L%d\n",
            h->scsi_host->host_no,
            dev->bus, dev->target, dev->lun);
        return FAILED;
    }
    dev_info(&h->pdev->dev, "%s REQUEST SUCCEEDED.\n", msg);

    /* If the abort(s) above completed and actually aborted the
     * command, then the command to be aborted should already be
     * completed.  If not, wait around a bit more to see if they
     * manage to complete normally.
     */
#define ABORT_COMPLETE_WAIT_SECS 30
    for (i = 0; i < ABORT_COMPLETE_WAIT_SECS * 10; i++) {
        found = hpsa_find_cmd_in_queue(h, sc, &h->cmpQ);
        if (!found)
            return SUCCESS;
        msleep(100);
    }
    dev_warn(&h->pdev->dev, "%s FAILED. Aborted command has not completed after %d seconds.\n",
        msg, ABORT_COMPLETE_WAIT_SECS);
    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;
    unsigned long flags;

    spin_lock_irqsave(&h->lock, flags);
    do {
        i = find_first_zero_bit(h->cmd_pool_bits, h->nr_cmds);
        if (i == h->nr_cmds) {
            spin_unlock_irqrestore(&h->lock, flags);
            return NULL;
        }
    } while (test_and_set_bit
         (i & (BITS_PER_LONG - 1),
          h->cmd_pool_bits + (i / BITS_PER_LONG)) != 0);
    h->nr_allocs++;
    spin_unlock_irqrestore(&h->lock, flags);

    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);

    c->cmdindex = i;

    INIT_LIST_HEAD(&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_LIST_HEAD(&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;
    unsigned long flags;

    i = c - h->cmd_pool;
    spin_lock_irqsave(&h->lock, flags);
    clear_bit(i & (BITS_PER_LONG - 1),
          h->cmd_pool_bits + (i / BITS_PER_LONG));
    h->nr_frees++;
    spin_unlock_irqrestore(&h->lock, flags);
}

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 & DIRECT_LOOKUP_MASK));
}

#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;

    memset(&arg64, 0, sizeof(arg64));
    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;

    memset(&arg64, 0, sizeof(arg64));
    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_if_no_lockup(h, c);
    if (iocommand.buf_size > 0)
        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 &&
        iocommand.buf_size > 0) {
        /* 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 * SG_ENTRIES_IN_CMD) {
        status = -EINVAL;
        goto cleanup1;
    }
    buff = kzalloc(SG_ENTRIES_IN_CMD * sizeof(char *), GFP_KERNEL);
    if (!buff) {
        status = -ENOMEM;
        goto cleanup1;
    }
    buff_size = kmalloc(SG_ENTRIES_IN_CMD * 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;
    c->Header.SGList = c->Header.SGTotal = sg_used;
    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_if_no_lockup(h, c);
    if (sg_used)
        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 && ioc->buf_size > 0) {
        /* 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 int __devinit hpsa_send_host_reset(struct ctlr_info *h,
    unsigned char *scsi3addr, u8 reset_type)
{
    struct CommandList *c;

    c = cmd_alloc(h);
    if (!c)
        return -ENOMEM;
    fill_cmd(c, HPSA_DEVICE_RESET_MSG, h, NULL, 0, 0,
        RAID_CTLR_LUNID, TYPE_MSG);
    c->Request.CDB[1] = reset_type; /* fill_cmd defaults to target reset */
    c->waiting = NULL;
    enqueue_cmd_and_start_io(h, c);
    /* Don't wait for completion, the reset won't complete.  Don't free
     * the command either.  This is the last command we will send before
     * re-initializing everything, so it doesn't matter and won't leak.
     */
    return 0;
}

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;
    struct CommandList *a; /* for commands to be aborted */

    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;
            c->Request.CDB[7] = (size >> 8) & 0xFF;
            c->Request.CDB[8] = size & 0xFF;
            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\n", 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 */
            memset(&c->Request.CDB[0], 0, sizeof(c->Request.CDB));
            c->Request.CDB[0] =  cmd;
            c->Request.CDB[1] = HPSA_RESET_TYPE_LUN;
            /* 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;
        case  HPSA_ABORT_MSG:
            a = buff;       /* point to command to be aborted */
            dev_dbg(&h->pdev->dev, "Abort Tag:0x%08x:%08x using request Tag:0x%08x:%08x\n",
                a->Header.Tag.upper, a->Header.Tag.lower,
                c->Header.Tag.upper, c->Header.Tag.lower);
            c->Request.CDBLen = 16;
            c->Request.Type.Type = TYPE_MSG;
            c->Request.Type.Attribute = ATTR_SIMPLE;
            c->Request.Type.Direction = XFER_WRITE;
            c->Request.Timeout = 0; /* Don't time out */
            c->Request.CDB[0] = HPSA_TASK_MANAGEMENT;
            c->Request.CDB[1] = HPSA_TMF_ABORT_TASK;
            c->Request.CDB[2] = 0x00; /* reserved */
            c->Request.CDB[3] = 0x00; /* reserved */
            /* Tag to abort goes in CDB[4]-CDB[11] */
            c->Request.CDB[4] = a->Header.Tag.lower & 0xFF;
            c->Request.CDB[5] = (a->Header.Tag.lower >> 8) & 0xFF;
            c->Request.CDB[6] = (a->Header.Tag.lower >> 16) & 0xFF;
            c->Request.CDB[7] = (a->Header.Tag.lower >> 24) & 0xFF;
            c->Request.CDB[8] = a->Header.Tag.upper & 0xFF;
            c->Request.CDB[9] = (a->Header.Tag.upper >> 8) & 0xFF;
            c->Request.CDB[10] = (a->Header.Tag.upper >> 16) & 0xFF;
            c->Request.CDB[11] = (a->Header.Tag.upper >> 24) & 0xFF;
            c->Request.CDB[12] = 0x00; /* reserved */
            c->Request.CDB[13] = 0x00; /* reserved */
            c->Request.CDB[14] = 0x00; /* reserved */
            c->Request.CDB[15] = 0x00; /* reserved */
        break;
        default:
            dev_warn(&h->pdev->dev, "unknown message type %d\n",
                cmd);
            BUG();
        }
    } else {
        dev_warn(&h->pdev->dev, "unknown command type %d\n", 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_nocache(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;
    unsigned long flags;

    spin_lock_irqsave(&h->lock, flags);
    while (!list_empty(&h->reqQ)) {
        c = list_entry(h->reqQ.next, struct CommandList, list);
        /* can't do anything if fifo is full */
        if ((h->access.fifo_full(h))) {
            dev_warn(&h->pdev->dev, "fifo full\n");
            break;
        }

        /* Get the first entry from the Request Q */
        removeQ(c);
        h->Qdepth--;

        /* Put job onto the completed Q */
        addQ(&h->cmpQ, c);

        /* Must increment commands_outstanding before unlocking
         * and submitting to avoid race checking for fifo full
         * condition.
         */
        h->commands_outstanding++;
        if (h->commands_outstanding > h->max_outstanding)
            h->max_outstanding = h->commands_outstanding;

        /* Tell the controller execute command */
        spin_unlock_irqrestore(&h->lock, flags);
        h->access.submit_command(h, c);
        spin_lock_irqsave(&h->lock, flags);
    }
    spin_unlock_irqrestore(&h->lock, flags);
}

static inline unsigned long get_next_completion(struct ctlr_info *h, u8 q)
{
    return h->access.command_completed(h, q);
}

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->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.\n", raw_tag);
        return 1;
    }
    return 0;
}

static inline void finish_cmd(struct CommandList *c)
{
    unsigned long flags;

    spin_lock_irqsave(&c->h->lock, flags);
    removeQ(c);
    spin_unlock_irqrestore(&c->h->lock, flags);
    dial_up_lockup_detection_on_fw_flash_complete(c->h, c);
    if (likely(c->cmd_type == CMD_SCSI))
        complete_scsi_command(c);
    else if (c->cmd_type == CMD_IOCTL_PEND)
        complete(c->waiting);
}

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

static inline u32 hpsa_tag_to_index(u32 tag)
{
    return tag >> DIRECT_LOOKUP_SHIFT;
}


static inline u32 hpsa_tag_discard_error_bits(struct ctlr_info *h, u32 tag)
{
#define HPSA_PERF_ERROR_BITS ((1 << DIRECT_LOOKUP_SHIFT) - 1)
#define HPSA_SIMPLE_ERROR_BITS 0x03
    if (unlikely(!(h->transMethod & CFGTBL_Trans_Performant)))
        return tag & ~HPSA_SIMPLE_ERROR_BITS;
    return tag & ~HPSA_PERF_ERROR_BITS;
}

/* process completion of an indexed ("direct lookup") command */
static inline void 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)) {
        c = h->cmd_pool + tag_index;
        finish_cmd(c);
    }
}

/* process completion of a non-indexed command */
static inline void process_nonindexed_cmd(struct ctlr_info *h,
    u32 raw_tag)
{
    u32 tag;
    struct CommandList *c = NULL;
    unsigned long flags;

    tag = hpsa_tag_discard_error_bits(h, raw_tag);
    spin_lock_irqsave(&h->lock, flags);
    list_for_each_entry(c, &h->cmpQ, list) {
        if ((c->busaddr & 0xFFFFFFE0) == (tag & 0xFFFFFFE0)) {
            spin_unlock_irqrestore(&h->lock, flags);
            finish_cmd(c);
            return;
        }
    }
    spin_unlock_irqrestore(&h->lock, flags);
    bad_tag(h, h->nr_cmds + 1, raw_tag);
}

/* Some controllers, like p400, will give us one interrupt
 * after a soft reset, even if we turned interrupts off.
 * Only need to check for this in the hpsa_xxx_discard_completions
 * functions.
 */
static int ignore_bogus_interrupt(struct ctlr_info *h)
{
    if (likely(!reset_devices))
        return 0;

    if (likely(h->interrupts_enabled))
        return 0;

    dev_info(&h->pdev->dev, "Received interrupt while interrupts disabled "
        "(known firmware bug.)  Ignoring.\n");

    return 1;
}

/*
 * Convert &h->q[x] (passed to interrupt handlers) back to h.
 * Relies on (h-q[x] == x) being true for x such that
 * 0 <= x < MAX_REPLY_QUEUES.
 */
static struct ctlr_info *queue_to_hba(u8 *queue)
{
    return container_of((queue - *queue), struct ctlr_info, q[0]);
}

static irqreturn_t hpsa_intx_discard_completions(int irq, void *queue)
{
    struct ctlr_info *h = queue_to_hba(queue);
    u8 q = *(u8 *) queue;
    u32 raw_tag;

    if (ignore_bogus_interrupt(h))
        return IRQ_NONE;

    if (interrupt_not_for_us(h))
        return IRQ_NONE;
    h->last_intr_timestamp = get_jiffies_64();
    while (interrupt_pending(h)) {
        raw_tag = get_next_completion(h, q);
        while (raw_tag != FIFO_EMPTY)
            raw_tag = next_command(h, q);
    }
    return IRQ_HANDLED;
}

static irqreturn_t hpsa_msix_discard_completions(int irq, void *queue)
{
    struct ctlr_info *h = queue_to_hba(queue);
    u32 raw_tag;
    u8 q = *(u8 *) queue;

    if (ignore_bogus_interrupt(h))
        return IRQ_NONE;

    h->last_intr_timestamp = get_jiffies_64();
    raw_tag = get_next_completion(h, q);
    while (raw_tag != FIFO_EMPTY)
        raw_tag = next_command(h, q);
    return IRQ_HANDLED;
}

static irqreturn_t do_hpsa_intr_intx(int irq, void *queue)
{
    struct ctlr_info *h = queue_to_hba((u8 *) queue);
    u32 raw_tag;
    u8 q = *(u8 *) queue;

    if (interrupt_not_for_us(h))
        return IRQ_NONE;
    h->last_intr_timestamp = get_jiffies_64();
    while (interrupt_pending(h)) {
        raw_tag = get_next_completion(h, q);
        while (raw_tag != FIFO_EMPTY) {
            if (likely(hpsa_tag_contains_index(raw_tag)))
                process_indexed_cmd(h, raw_tag);
            else
                process_nonindexed_cmd(h, raw_tag);
            raw_tag = next_command(h, q);
        }
    }
    return IRQ_HANDLED;
}

static irqreturn_t do_hpsa_intr_msi(int irq, void *queue)
{
    struct ctlr_info *h = queue_to_hba(queue);
    u32 raw_tag;
    u8 q = *(u8 *) queue;

    h->last_intr_timestamp = get_jiffies_64();
    raw_tag = get_next_completion(h, q);
    while (raw_tag != FIFO_EMPTY) {
        if (likely(hpsa_tag_contains_index(raw_tag)))
            process_indexed_cmd(h, raw_tag);
        else
            process_nonindexed_cmd(h, raw_tag);
        raw_tag = next_command(h, q);
    }
    return IRQ_HANDLED;
}

/* Send a message CDB to the firmware. Careful, this only works
 * in simple mode, not performant mode due to the tag lookup.
 * We only ever use this immediately after a controller reset.
 */
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 ((tag & ~HPSA_SIMPLE_ERROR_BITS) == 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\n",
            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\n",
            opcode, type);
        return -EIO;
    }

    dev_info(&pdev->dev, "controller message %02x:%02x succeeded\n",
        opcode, type);
    return 0;
}

#define hpsa_noop(p) hpsa_message(p, 3, 0)

static int hpsa_controller_hard_reset(struct pci_dev *pdev,
    void * __iomem vaddr, u32 use_doorbell)
{
    u16 pmcsr;
    int pos;

    if (use_doorbell) {
        /* For everything after the P600, the PCI power state method
         * of resetting the controller doesn't work, so we have this
         * other way using the doorbell register.
         */
        dev_info(&pdev->dev, "using doorbell to reset controller\n");
        writel(use_doorbell, vaddr + SA5_DOORBELL);
    } else { /* Try to do it the PCI power state way */

        /* 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." */

        pos = pci_find_capability(pdev, PCI_CAP_ID_PM);
        if (pos == 0) {
            dev_err(&pdev->dev,
                "hpsa_reset_controller: "
                "PCI PM not supported\n");
            return -ENODEV;
        }
        dev_info(&pdev->dev, "using PCI PM to reset controller\n");
        /* 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);

        /*
         * The P600 requires a small delay when changing states.
         * Otherwise we may think the board did not reset and we bail.
         * This for kdump only and is particular to the P600.
         */
        msleep(500);
    }
    return 0;
}

static __devinit void init_driver_version(char *driver_version, int len)
{
    memset(driver_version, 0, len);
    strncpy(driver_version, HPSA " " HPSA_DRIVER_VERSION, len - 1);
}

static __devinit int write_driver_ver_to_cfgtable(
    struct CfgTable __iomem *cfgtable)
{
    char *driver_version;
    int i, size = sizeof(cfgtable->driver_version);

    driver_version = kmalloc(size, GFP_KERNEL);
    if (!driver_version)
        return -ENOMEM;

    init_driver_version(driver_version, size);
    for (i = 0; i < size; i++)
        writeb(driver_version[i], &cfgtable->driver_version[i]);
    kfree(driver_version);
    return 0;
}

static __devinit void read_driver_ver_from_cfgtable(
    struct CfgTable __iomem *cfgtable, unsigned char *driver_ver)
{
    int i;

    for (i = 0; i < sizeof(cfgtable->driver_version); i++)
        driver_ver[i] = readb(&cfgtable->driver_version[i]);
}

static __devinit int controller_reset_failed(
    struct CfgTable __iomem *cfgtable)
{

    char *driver_ver, *old_driver_ver;
    int rc, size = sizeof(cfgtable->driver_version);

    old_driver_ver = kmalloc(2 * size, GFP_KERNEL);
    if (!old_driver_ver)
        return -ENOMEM;
    driver_ver = old_driver_ver + size;

    /* After a reset, the 32 bytes of "driver version" in the cfgtable
     * should have been changed, otherwise we know the reset failed.
     */
    init_driver_version(old_driver_ver, size);
    read_driver_ver_from_cfgtable(cfgtable, driver_ver);
    rc = !memcmp(driver_ver, old_driver_ver, size);
    kfree(old_driver_ver);
    return rc;
}
/* This does a hard reset of the controller using PCI power management
 * states or the using the doorbell register.
 */
static __devinit int hpsa_kdump_hard_reset_controller(struct pci_dev *pdev)
{
    u64 cfg_offset;
    u32 cfg_base_addr;
    u64 cfg_base_addr_index;
    void __iomem *vaddr;
    unsigned long paddr;
    u32 misc_fw_support;
    int rc;
    struct CfgTable __iomem *cfgtable;
    u32 use_doorbell;
    u32 board_id;
    u16 command_register;

    /* For controllers as old as the P600, 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);
     *
     * For controllers newer than the P600, the pci power state
     * method of resetting doesn't work so we have another way
     * using the doorbell register.
     */

    rc = hpsa_lookup_board_id(pdev, &board_id);
    if (rc < 0 || !ctlr_is_resettable(board_id)) {
        dev_warn(&pdev->dev, "Not resetting device.\n");
        return -ENODEV;
    }

    /* if controller is soft- but not hard resettable... */
    if (!ctlr_is_hard_resettable(board_id))
        return -ENOTSUPP; /* try soft reset later. */

    /* Save the PCI command register */
    pci_read_config_word(pdev, 4, &command_register);
    /* Turn the board off.  This is so that later pci_restore_state()
     * won't turn the board on before the rest of config space is ready.
     */
    pci_disable_device(pdev);
    pci_save_state(pdev);

    /* find the first memory BAR, so we can find the cfg table */
    rc = hpsa_pci_find_memory_BAR(pdev, &paddr);
    if (rc)
        return rc;
    vaddr = remap_pci_mem(paddr, 0x250);
    if (!vaddr)
        return -ENOMEM;

    /* find cfgtable in order to check if reset via doorbell is supported */
    rc = hpsa_find_cfg_addrs(pdev, vaddr, &cfg_base_addr,
                    &cfg_base_addr_index, &cfg_offset);
    if (rc)
        goto unmap_vaddr;
    cfgtable = remap_pci_mem(pci_resource_start(pdev,
               cfg_base_addr_index) + cfg_offset, sizeof(*cfgtable));
    if (!cfgtable) {
        rc = -ENOMEM;
        goto unmap_vaddr;
    }
    rc = write_driver_ver_to_cfgtable(cfgtable);
    if (rc)
        goto unmap_vaddr;

    /* If reset via doorbell register is supported, use that.
     * There are two such methods.  Favor the newest method.
     */
    misc_fw_support = readl(&cfgtable->misc_fw_support);
    use_doorbell = misc_fw_support & MISC_FW_DOORBELL_RESET2;
    if (use_doorbell) {
        use_doorbell = DOORBELL_CTLR_RESET2;
    } else {
        use_doorbell = misc_fw_support & MISC_FW_DOORBELL_RESET;
        if (use_doorbell) {
            dev_warn(&pdev->dev, "Soft reset not supported. "
                "Firmware update is required.\n");
            rc = -ENOTSUPP; /* try soft reset */
            goto unmap_cfgtable;
        }
    }

    rc = hpsa_controller_hard_reset(pdev, vaddr, use_doorbell);
    if (rc)
        goto unmap_cfgtable;

    pci_restore_state(pdev);
    rc = pci_enable_device(pdev);
    if (rc) {
        dev_warn(&pdev->dev, "failed to enable device.\n");
        goto unmap_cfgtable;
    }
    pci_write_config_word(pdev, 4, command_register);

    /* Some devices (notably the HP Smart Array 5i Controller)
       need a little pause here */
    msleep(HPSA_POST_RESET_PAUSE_MSECS);

    /* Wait for board to become not ready, then ready. */
    dev_info(&pdev->dev, "Waiting for board to reset.\n");
    rc = hpsa_wait_for_board_state(pdev, vaddr, BOARD_NOT_READY);
    if (rc) {
        dev_warn(&pdev->dev,
            "failed waiting for board to reset."
            " Will try soft reset.\n");
        rc = -ENOTSUPP; /* Not expected, but try soft reset later */
        goto unmap_cfgtable;
    }
    rc = hpsa_wait_for_board_state(pdev, vaddr, BOARD_READY);
    if (rc) {
        dev_warn(&pdev->dev,
            "failed waiting for board to become ready "
            "after hard reset\n");
        goto unmap_cfgtable;
    }

    rc = controller_reset_failed(vaddr);
    if (rc < 0)
        goto unmap_cfgtable;
    if (rc) {
        dev_warn(&pdev->dev, "Unable to successfully reset "
            "controller. Will try soft reset.\n");
        rc = -ENOTSUPP;
    } else {
        dev_info(&pdev->dev, "board ready after hard reset.\n");
    }

unmap_cfgtable:
    iounmap(cfgtable);

unmap_vaddr:
    iounmap(vaddr);
    return rc;
}

/*
 *  We cannot read the structure directly, for portability we must use
 *   the io functions.
 *   This is for debug only.
 */
static void print_cfg_table(struct device *dev, struct CfgTable *tb)
{
#ifdef HPSA_DEBUG
    int i;
    char temp_name[17];

    dev_info(dev, "Controller Configuration information\n");
    dev_info(dev, "------------------------------------\n");
    for (i = 0; i < 4; i++)
        temp_name[i] = readb(&(tb->Signature[i]));
    temp_name[4] = '\0';
    dev_info(dev, "   Signature = %s\n", temp_name);
    dev_info(dev, "   Spec Number = %d\n", readl(&(tb->SpecValence)));
    dev_info(dev, "   Transport methods supported = 0x%x\n",
           readl(&(tb->TransportSupport)));
    dev_info(dev, "   Transport methods active = 0x%x\n",
           readl(&(tb->TransportActive)));
    dev_info(dev, "   Requested transport Method = 0x%x\n",
           readl(&(tb->HostWrite.TransportRequest)));
    dev_info(dev, "   Coalesce Interrupt Delay = 0x%x\n",
           readl(&(tb->HostWrite.CoalIntDelay)));
    dev_info(dev, "   Coalesce Interrupt Count = 0x%x\n",
           readl(&(tb->HostWrite.CoalIntCount)));
    dev_info(dev, "   Max outstanding commands = 0x%d\n",
           readl(&(tb->CmdsOutMax)));
    dev_info(dev, "   Bus Types = 0x%x\n", readl(&(tb->BusTypes)));
    for (i = 0; i < 16; i++)
        temp_name[i] = readb(&(tb->ServerName[i]));
    temp_name[16] = '\0';
    dev_info(dev, "   Server Name = %s\n", temp_name);
    dev_info(dev, "   Heartbeat Counter = 0x%x\n\n\n",
        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\n");
                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)
{
#ifdef CONFIG_PCI_MSI
    int err, i;
    struct msix_entry hpsa_msix_entries[MAX_REPLY_QUEUES];

    for (i = 0; i < MAX_REPLY_QUEUES; i++) {
        hpsa_msix_entries[i].vector = 0;
        hpsa_msix_entries[i].entry = i;
    }

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

static int __devinit hpsa_lookup_board_id(struct pci_dev *pdev, u32 *board_id)
{
    int i;
    u32 subsystem_vendor_id, subsystem_device_id;

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

    for (i = 0; i < ARRAY_SIZE(products); i++)
        if (*board_id == products[i].board_id)
            return i;

    if ((subsystem_vendor_id != PCI_VENDOR_ID_HP &&
        subsystem_vendor_id != PCI_VENDOR_ID_COMPAQ) ||
        !hpsa_allow_any) {
        dev_warn(&pdev->dev, "unrecognized board ID: "
            "0x%08x, ignoring.\n", *board_id);
            return -ENODEV;
    }
    return ARRAY_SIZE(products) - 1; /* generic unknown smart array */
}

static int __devinit hpsa_pci_find_memory_BAR(struct pci_dev *pdev,
    unsigned long *memory_bar)
{
    int i;

    for (i = 0; i < DEVICE_COUNT_RESOURCE; i++)
        if (pci_resource_flags(pdev, i) & IORESOURCE_MEM) {
            /* addressing mode bits already removed */
            *memory_bar = pci_resource_start(pdev, i);
            dev_dbg(&pdev->dev, "memory BAR = %lx\n",
                *memory_bar);
            return 0;
        }
    dev_warn(&pdev->dev, "no memory BAR found\n");
    return -ENODEV;
}

static int __devinit hpsa_wait_for_board_state(struct pci_dev *pdev,
    void __iomem *vaddr, int wait_for_ready)
{
    int i, iterations;
    u32 scratchpad;
    if (wait_for_ready)
        iterations = HPSA_BOARD_READY_ITERATIONS;
    else
        iterations = HPSA_BOARD_NOT_READY_ITERATIONS;

    for (i = 0; i < iterations; i++) {
        scratchpad = readl(vaddr + SA5_SCRATCHPAD_OFFSET);
        if (wait_for_ready) {
            if (scratchpad == HPSA_FIRMWARE_READY)
                return 0;
        } else {
            if (scratchpad != HPSA_FIRMWARE_READY)
                return 0;
        }
        msleep(HPSA_BOARD_READY_POLL_INTERVAL_MSECS);
    }
    dev_warn(&pdev->dev, "board not ready, timed out.\n");
    return -ENODEV;
}

static int __devinit hpsa_find_cfg_addrs(struct pci_dev *pdev,
    void __iomem *vaddr, u32 *cfg_base_addr, u64 *cfg_base_addr_index,
    u64 *cfg_offset)
{
    *cfg_base_addr = readl(vaddr + SA5_CTCFG_OFFSET);
    *cfg_offset = readl(vaddr + SA5_CTMEM_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\n");
        return -ENODEV;
    }
    return 0;
}

static int __devinit hpsa_find_cfgtables(struct ctlr_info *h)
{
    u64 cfg_offset;
    u32 cfg_base_addr;
    u64 cfg_base_addr_index;
    u32 trans_offset;
    int rc;

    rc = hpsa_find_cfg_addrs(h->pdev, h->vaddr, &cfg_base_addr,
        &cfg_base_addr_index, &cfg_offset);
    if (rc)
        return rc;
    h->cfgtable = remap_pci_mem(pci_resource_start(h->pdev,
               cfg_base_addr_index) + cfg_offset, sizeof(*h->cfgtable));
    if (!h->cfgtable)
        return -ENOMEM;
    rc = write_driver_ver_to_cfgtable(h->cfgtable);
    if (rc)
        return rc;
    /* Find performant mode table. */
    trans_offset = readl(&h->cfgtable->TransMethodOffset);
    h->transtable = remap_pci_mem(pci_resource_start(h->pdev,
                cfg_base_addr_index)+cfg_offset+trans_offset,
                sizeof(*h->transtable));
    if (!h->transtable)
        return -ENOMEM;
    return 0;
}

static void __devinit hpsa_get_max_perf_mode_cmds(struct ctlr_info *h)
{
    h->max_commands = readl(&(h->cfgtable->MaxPerformantModeCommands));

    /* Limit commands in memory limited kdump scenario. */
    if (reset_devices && h->max_commands > 32)
        h->max_commands = 32;

    if (h->max_commands < 16) {
        dev_warn(&h->pdev->dev, "Controller reports "
            "max supported commands of %d, an obvious lie. "
            "Using 16.  Ensure that firmware is up to date.\n",
            h->max_commands);
        h->max_commands = 16;
    }
}

/* Interrogate the hardware for some limits:
 * max commands, max SG elements without chaining, and with chaining,
 * SG chain block size, etc.
 */
static void __devinit hpsa_find_board_params(struct ctlr_info *h)
{
    hpsa_get_max_perf_mode_cmds(h);
    h->nr_cmds = h->max_commands - 4; /* Allow room for some ioctls */
    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;
    }

    /* Find out what task management functions are supported and cache */
    h->TMFSupportFlags = readl(&(h->cfgtable->TMFSupportFlags));
}

static inline bool hpsa_CISS_signature_present(struct ctlr_info *h)
{
    if (!check_signature(h->cfgtable->Signature, "CISS", 4)) {
        dev_warn(&h->pdev->dev, "not a valid CISS config table\n");
        return false;
    }
    return true;
}

/* Need to enable prefetch in the SCSI core for 6400 in x86 */
static inline void hpsa_enable_scsi_prefetch(struct ctlr_info *h)
{
#ifdef CONFIG_X86
    u32 prefetch;

    prefetch = readl(&(h->cfgtable->SCSI_Prefetch));
    prefetch |= 0x100;
    writel(prefetch, &(h->cfgtable->SCSI_Prefetch));
#endif
}

/* Disable DMA prefetch for the P600.  Otherwise an ASIC bug may result
 * in a prefetch beyond physical memory.
 */
static inline void hpsa_p600_dma_prefetch_quirk(struct ctlr_info *h)
{
    u32 dma_prefetch;

    if (h->board_id != 0x3225103C)
        return;
    dma_prefetch = readl(h->vaddr + I2O_DMA1_CFG);
    dma_prefetch |= 0x8000;
    writel(dma_prefetch, h->vaddr + I2O_DMA1_CFG);
}

static void __devinit hpsa_wait_for_mode_change_ack(struct ctlr_info *h)
{
    int i;
    u32 doorbell_value;
    unsigned long flags;

    /* 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++) {
        spin_lock_irqsave(&h->lock, flags);
        doorbell_value = readl(h->vaddr + SA5_DOORBELL);
        spin_unlock_irqrestore(&h->lock, flags);
        if (!(doorbell_value & CFGTBL_ChangeReq))
            break;
        /* delay and try again */
        usleep_range(10000, 20000);
    }
}

static int __devinit hpsa_enter_simple_mode(struct ctlr_info *h)
{
    u32 trans_support;

    trans_support = readl(&(h->cfgtable->TransportSupport));
    if (!(trans_support & SIMPLE_MODE))
        return -ENOTSUPP;

    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);
    hpsa_wait_for_mode_change_ack(h);
    print_cfg_table(&h->pdev->dev, h->cfgtable);
    if (!(readl(&(h->cfgtable->TransportActive)) & CFGTBL_Trans_Simple)) {
        dev_warn(&h->pdev->dev,
            "unable to get board into simple mode\n");
        return -ENODEV;
    }
    h->transMethod = CFGTBL_Trans_Simple;
    return 0;
}

static int __devinit hpsa_pci_init(struct ctlr_info *h)
{
    int prod_index, err;

    prod_index = hpsa_lookup_board_id(h->pdev, &h->board_id);
    if (prod_index < 0)
        return -ENODEV;
    h->product_name = products[prod_index].product_name;
    h->access = *(products[prod_index].access);

    pci_disable_link_state(h->pdev, PCIE_LINK_STATE_L0S |
                   PCIE_LINK_STATE_L1 | PCIE_LINK_STATE_CLKPM);

    err = pci_enable_device(h->pdev);
    if (err) {
        dev_warn(&h->pdev->dev, "unable to enable PCI device\n");
        return err;
    }

    /* Enable bus mastering (pci_disable_device may disable this) */
    pci_set_master(h->pdev);

    err = pci_request_regions(h->pdev, HPSA);
    if (err) {
        dev_err(&h->pdev->dev,
            "cannot obtain PCI resources, aborting\n");
        return err;
    }
    hpsa_interrupt_mode(h);
    err = hpsa_pci_find_memory_BAR(h->pdev, &h->paddr);
    if (err)
        goto err_out_free_res;
    h->vaddr = remap_pci_mem(h->paddr, 0x250);
    if (!h->vaddr) {
        err = -ENOMEM;
        goto err_out_free_res;
    }
    err = hpsa_wait_for_board_state(h->pdev, h->vaddr, BOARD_READY);
    if (err)
        goto err_out_free_res;
    err = hpsa_find_cfgtables(h);
    if (err)
        goto err_out_free_res;
    hpsa_find_board_params(h);

    if (!hpsa_CISS_signature_present(h)) {
        err = -ENODEV;
        goto err_out_free_res;
    }
    hpsa_enable_scsi_prefetch(h);
    hpsa_p600_dma_prefetch_quirk(h);
    err = hpsa_enter_simple_mode(h);
    if (err)
        goto err_out_free_res;
    return 0;

err_out_free_res:
    if (h->transtable)
        iounmap(h->transtable);
    if (h->cfgtable)
        iounmap(h->cfgtable);
    if (h->vaddr)
        iounmap(h->vaddr);
    pci_disable_device(h->pdev);
    pci_release_regions(h->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 __devinit int hpsa_init_reset_devices(struct pci_dev *pdev)
{
    int rc, i;

    if (!reset_devices)
        return 0;

    /* Reset the controller with a PCI power-cycle or via doorbell */
    rc = hpsa_kdump_hard_reset_controller(pdev);

    /* -ENOTSUPP here means we cannot reset the controller
     * but it's already (and still) up and running in
     * "performant mode".  Or, it might be 640x, which can't reset
     * due to concerns about shared bbwc between 6402/6404 pair.
     */
    if (rc == -ENOTSUPP)
        return rc; /* just try to do the kdump anyhow. */
    if (rc)
        return -ENODEV;

    /* Now try to get the controller to respond to a no-op */
    dev_warn(&pdev->dev, "Waiting for controller to respond to no-op\n");
    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\n",
                    (i < 11 ? "; re-trying" : ""));
    }
    return 0;
}

static __devinit int hpsa_allocate_cmd_pool(struct ctlr_info *h)
{
    h->cmd_pool_bits = kzalloc(
        DIV_ROUND_UP(h->nr_cmds, 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(&h->pdev->dev, "out of memory in %s", __func__);
        return -ENOMEM;
    }
    return 0;
}

static void hpsa_free_cmd_pool(struct ctlr_info *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);
}

static int hpsa_request_irq(struct ctlr_info *h,
    irqreturn_t (*msixhandler)(int, void *),
    irqreturn_t (*intxhandler)(int, void *))
{
    int rc, i;

    /*
     * initialize h->q[x] = x so that interrupt handlers know which
     * queue to process.
     */
    for (i = 0; i < MAX_REPLY_QUEUES; i++)
        h->q[i] = (u8) i;

    if (h->intr_mode == PERF_MODE_INT && h->msix_vector) {
        /* If performant mode and MSI-X, use multiple reply queues */
        for (i = 0; i < MAX_REPLY_QUEUES; i++)
            rc = request_irq(h->intr[i], msixhandler,
                    0, h->devname,
                    &h->q[i]);
    } else {
        /* Use single reply pool */
        if (h->msix_vector || h->msi_vector) {
            rc = request_irq(h->intr[h->intr_mode],
                msixhandler, 0, h->devname,
                &h->q[h->intr_mode]);
        } else {
            rc = request_irq(h->intr[h->intr_mode],
                intxhandler, IRQF_SHARED, h->devname,
                &h->q[h->intr_mode]);
        }
    }
    if (rc) {
        dev_err(&h->pdev->dev, "unable to get irq %d for %s\n",
               h->intr[h->intr_mode], h->devname);
        return -ENODEV;
    }
    return 0;
}

static int __devinit hpsa_kdump_soft_reset(struct ctlr_info *h)
{
    if (hpsa_send_host_reset(h, RAID_CTLR_LUNID,
        HPSA_RESET_TYPE_CONTROLLER)) {
        dev_warn(&h->pdev->dev, "Resetting array controller failed.\n");
        return -EIO;
    }

    dev_info(&h->pdev->dev, "Waiting for board to soft reset.\n");
    if (hpsa_wait_for_board_state(h->pdev, h->vaddr, BOARD_NOT_READY)) {
        dev_warn(&h->pdev->dev, "Soft reset had no effect.\n");
        return -1;
    }

    dev_info(&h->pdev->dev, "Board reset, awaiting READY status.\n");
    if (hpsa_wait_for_board_state(h->pdev, h->vaddr, BOARD_READY)) {
        dev_warn(&h->pdev->dev, "Board failed to become ready "
            "after soft reset.\n");
        return -1;
    }

    return 0;
}

static void free_irqs(struct ctlr_info *h)
{
    int i;

    if (!h->msix_vector || h->intr_mode != PERF_MODE_INT) {
        /* Single reply queue, only one irq to free */
        i = h->intr_mode;
        free_irq(h->intr[i], &h->q[i]);
        return;
    }

    for (i = 0; i < MAX_REPLY_QUEUES; i++)
        free_irq(h->intr[i], &h->q[i]);
}

static void hpsa_free_irqs_and_disable_msix(struct ctlr_info *h)
{
    free_irqs(h);
#ifdef CONFIG_PCI_MSI
    if (h->msix_vector) {
        if (h->pdev->msix_enabled)
            pci_disable_msix(h->pdev);
    } else if (h->msi_vector) {
        if (h->pdev->msi_enabled)
            pci_disable_msi(h->pdev);
    }
#endif /* CONFIG_PCI_MSI */
}

static void hpsa_undo_allocations_after_kdump_soft_reset(struct ctlr_info *h)
{
    hpsa_free_irqs_and_disable_msix(h);
    hpsa_free_sg_chain_blocks(h);
    hpsa_free_cmd_pool(h);
    kfree(h->blockFetchTable);
    pci_free_consistent(h->pdev, h->reply_pool_size,
        h->reply_pool, h->reply_pool_dhandle);
    if (h->vaddr)
        iounmap(h->vaddr);
    if (h->transtable)
        iounmap(h->transtable);
    if (h->cfgtable)
        iounmap(h->cfgtable);
    pci_release_regions(h->pdev);
    kfree(h);
}

static void remove_ctlr_from_lockup_detector_list(struct ctlr_info *h)
{
    assert_spin_locked(&lockup_detector_lock);
    if (!hpsa_lockup_detector)
        return;
    if (h->lockup_detected)
        return; /* already stopped the lockup detector */
    list_del(&h->lockup_list);
}

/* Called when controller lockup detected. */
static void fail_all_cmds_on_list(struct ctlr_info *h, struct list_head *list)
{
    struct CommandList *c = NULL;

    assert_spin_locked(&h->lock);
    /* Mark all outstanding commands as failed and complete them. */
    while (!list_empty(list)) {
        c = list_entry(list->next, struct CommandList, list);
        c->err_info->CommandStatus = CMD_HARDWARE_ERR;
        finish_cmd(c);
    }
}

static void controller_lockup_detected(struct ctlr_info *h)
{
    unsigned long flags;

    assert_spin_locked(&lockup_detector_lock);
    remove_ctlr_from_lockup_detector_list(h);
    h->access.set_intr_mask(h, HPSA_INTR_OFF);
    spin_lock_irqsave(&h->lock, flags);
    h->lockup_detected = readl(h->vaddr + SA5_SCRATCHPAD_OFFSET);
    spin_unlock_irqrestore(&h->lock, flags);
    dev_warn(&h->pdev->dev, "Controller lockup detected: 0x%08x\n",
            h->lockup_detected);
    pci_disable_device(h->pdev);
    spin_lock_irqsave(&h->lock, flags);
    fail_all_cmds_on_list(h, &h->cmpQ);
    fail_all_cmds_on_list(h, &h->reqQ);
    spin_unlock_irqrestore(&h->lock, flags);
}

static void detect_controller_lockup(struct ctlr_info *h)
{
    u64 now;
    u32 heartbeat;
    unsigned long flags;

    assert_spin_locked(&lockup_detector_lock);
    now = get_jiffies_64();
    /* If we've received an interrupt recently, we're ok. */
    if (time_after64(h->last_intr_timestamp +
                (h->heartbeat_sample_interval), now))
        return;

    /*
     * If we've already checked the heartbeat recently, we're ok.
     * This could happen if someone sends us a signal. We
     * otherwise don't care about signals in this thread.
     */
    if (time_after64(h->last_heartbeat_timestamp +
                (h->heartbeat_sample_interval), now))
        return;

    /* If heartbeat has not changed since we last looked, we're not ok. */
    spin_lock_irqsave(&h->lock, flags);
    heartbeat = readl(&h->cfgtable->HeartBeat);
    spin_unlock_irqrestore(&h->lock, flags);
    if (h->last_heartbeat == heartbeat) {
        controller_lockup_detected(h);
        return;
    }

    /* We're ok. */
    h->last_heartbeat = heartbeat;
    h->last_heartbeat_timestamp = now;
}

static int detect_controller_lockup_thread(void *notused)
{
    struct ctlr_info *h;
    unsigned long flags;

    while (1) {
        struct list_head *this, *tmp;

        schedule_timeout_interruptible(HEARTBEAT_SAMPLE_INTERVAL);
        if (kthread_should_stop())
            break;
        spin_lock_irqsave(&lockup_detector_lock, flags);
        list_for_each_safe(this, tmp, &hpsa_ctlr_list) {
            h = list_entry(this, struct ctlr_info, lockup_list);
            detect_controller_lockup(h);
        }
        spin_unlock_irqrestore(&lockup_detector_lock, flags);
    }
    return 0;
}

static void add_ctlr_to_lockup_detector_list(struct ctlr_info *h)
{
    unsigned long flags;

    h->heartbeat_sample_interval = HEARTBEAT_SAMPLE_INTERVAL;
    spin_lock_irqsave(&lockup_detector_lock, flags);
    list_add_tail(&h->lockup_list, &hpsa_ctlr_list);
    spin_unlock_irqrestore(&lockup_detector_lock, flags);
}

static void start_controller_lockup_detector(struct ctlr_info *h)
{
    /* Start the lockup detector thread if not already started */
    if (!hpsa_lockup_detector) {
        spin_lock_init(&lockup_detector_lock);
        hpsa_lockup_detector =
            kthread_run(detect_controller_lockup_thread,
                        NULL, HPSA);
    }
    if (!hpsa_lockup_detector) {
        dev_warn(&h->pdev->dev,
            "Could not start lockup detector thread\n");
        return;
    }
    add_ctlr_to_lockup_detector_list(h);
}

static void stop_controller_lockup_detector(struct ctlr_info *h)
{
    unsigned long flags;

    spin_lock_irqsave(&lockup_detector_lock, flags);
    remove_ctlr_from_lockup_detector_list(h);
    /* If the list of ctlr's to monitor is empty, stop the thread */
    if (list_empty(&hpsa_ctlr_list)) {
        spin_unlock_irqrestore(&lockup_detector_lock, flags);
        kthread_stop(hpsa_lockup_detector);
        spin_lock_irqsave(&lockup_detector_lock, flags);
        hpsa_lockup_detector = NULL;
    }
    spin_unlock_irqrestore(&lockup_detector_lock, flags);
}

static int __devinit hpsa_init_one(struct pci_dev *pdev,
                    const struct pci_device_id *ent)
{
    int dac, rc;
    struct ctlr_info *h;
    int try_soft_reset = 0;
    unsigned long flags;

    if (number_of_controllers == 0)
        printk(KERN_INFO DRIVER_NAME "\n");

    rc = hpsa_init_reset_devices(pdev);
    if (rc) {
        if (rc != -ENOTSUPP)
            return rc;
        /* If the reset fails in a particular way (it has no way to do
         * a proper hard reset, so returns -ENOTSUPP) we can try to do
         * a soft reset once we get the controller configured up to the
         * point that it can accept a command.
         */
        try_soft_reset = 1;
        rc = 0;
    }

reinit_after_soft_reset:

    /* 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->pdev = pdev;
    h->intr_mode = hpsa_simple_mode ? SIMPLE_MODE_INT : PERF_MODE_INT;
    INIT_LIST_HEAD(&h->cmpQ);
    INIT_LIST_HEAD(&h->reqQ);
    spin_lock_init(&h->lock);
    spin_lock_init(&h->scan_lock);
    rc = hpsa_pci_init(h);
    if (rc != 0)
        goto clean1;

    sprintf(h->devname, HPSA "%d", number_of_controllers);
    h->ctlr = number_of_controllers;
    number_of_controllers++;

    /* 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\n");
            goto clean1;
        }
    }

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

    if (hpsa_request_irq(h, do_hpsa_intr_msi, do_hpsa_intr_intx))
        goto clean2;
    dev_info(&pdev->dev, "%s: <0x%x> at IRQ %d%s using DAC\n",
           h->devname, pdev->device,
           h->intr[h->intr_mode], dac ? "" : " not");
    if (hpsa_allocate_cmd_pool(h))
        goto clean4;
    if (hpsa_allocate_sg_chain_blocks(h))
        goto clean4;
    init_waitqueue_head(&h->scan_wait_queue);
    h->scan_finished = 1; /* no scan currently in progress */

    pci_set_drvdata(pdev, h);
    h->ndevices = 0;
    h->scsi_host = NULL;
    spin_lock_init(&h->devlock);
    hpsa_put_ctlr_into_performant_mode(h);

    /* At this point, the controller is ready to take commands.
     * Now, if reset_devices and the hard reset didn't work, try
     * the soft reset and see if that works.
     */
    if (try_soft_reset) {

        /* This is kind of gross.  We may or may not get a completion
         * from the soft reset command, and if we do, then the value
         * from the fifo may or may not be valid.  So, we wait 10 secs
         * after the reset throwing away any completions we get during
         * that time.  Unregister the interrupt handler and register
         * fake ones to scoop up any residual completions.
         */
        spin_lock_irqsave(&h->lock, flags);
        h->access.set_intr_mask(h, HPSA_INTR_OFF);
        spin_unlock_irqrestore(&h->lock, flags);
        free_irqs(h);
        rc = hpsa_request_irq(h, hpsa_msix_discard_completions,
                    hpsa_intx_discard_completions);
        if (rc) {
            dev_warn(&h->pdev->dev, "Failed to request_irq after "
                "soft reset.\n");
            goto clean4;
        }

        rc = hpsa_kdump_soft_reset(h);
        if (rc)
            /* Neither hard nor soft reset worked, we're hosed. */
            goto clean4;

        dev_info(&h->pdev->dev, "Board READY.\n");
        dev_info(&h->pdev->dev,
            "Waiting for stale completions to drain.\n");
        h->access.set_intr_mask(h, HPSA_INTR_ON);
        msleep(10000);
        h->access.set_intr_mask(h, HPSA_INTR_OFF);

        rc = controller_reset_failed(h->cfgtable);
        if (rc)
            dev_info(&h->pdev->dev,
                "Soft reset appears to have failed.\n");

        /* since the controller's reset, we have to go back and re-init
         * everything.  Easiest to just forget what we've done and do it
         * all over again.
         */
        hpsa_undo_allocations_after_kdump_soft_reset(h);
        try_soft_reset = 0;
        if (rc)
            /* don't go to clean4, we already unallocated */
            return -ENODEV;

        goto reinit_after_soft_reset;
    }

    /* Turn the interrupts on so we can service requests */
    h->access.set_intr_mask(h, HPSA_INTR_ON);

    hpsa_hba_inquiry(h);
    hpsa_register_scsi(h);  /* hook ourselves into SCSI subsystem */
    start_controller_lockup_detector(h);
    return 1;

clean4:
    hpsa_free_sg_chain_blocks(h);
    hpsa_free_cmd_pool(h);
    free_irqs(h);
clean2:
clean1:
    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!\n");
        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\n");
    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);
    hpsa_free_irqs_and_disable_msix(h);
}

static void __devexit hpsa_free_device_info(struct ctlr_info *h)
{
    int i;

    for (i = 0; i < h->ndevices; i++)
        kfree(h->dev[i]);
}

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\n");
        return;
    }
    h = pci_get_drvdata(pdev);
    stop_controller_lockup_detector(h);
    hpsa_unregister_scsi(h);    /* unhook from SCSI subsystem */
    hpsa_shutdown(pdev);
    iounmap(h->vaddr);
    iounmap(h->transtable);
    iounmap(h->cfgtable);
    hpsa_free_device_info(h);
    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);
    pci_disable_device(pdev);
    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 __devinit void hpsa_enter_performant_mode(struct ctlr_info *h,
    u32 use_short_tags)
{
    int i;
    unsigned long register_value;

    /* This is a bit complicated.  There are 8 registers on
     * the controller which we write to to tell it 8 different
     * sizes of commands which there may be.  It's a way of
     * reducing the DMA done to fetch each command.  Encoded into
     * each command's tag are 3 bits which communicate to the controller
     * which of the eight sizes that command fits within.  The size of
     * each command depends on how many scatter gather entries there are.
     * Each SG entry requires 16 bytes.  The eight registers are programmed
     * with the number of 16-byte blocks a command of that size requires.
     * The smallest command possible requires 5 such 16 byte blocks.
     * the largest command possible requires SG_ENTRIES_IN_CMD + 4 16-byte
     * blocks.  Note, this only extends to the SG entries contained
     * within the command block, and does not extend to chained blocks
     * of SG elements.   bft[] contains the eight values we write to
     * the registers.  They are not evenly distributed, but have more
     * sizes for small commands, and fewer sizes for larger commands.
     */
    int bft[8] = {5, 6, 8, 10, 12, 20, 28, SG_ENTRIES_IN_CMD + 4};
    BUILD_BUG_ON(28 > SG_ENTRIES_IN_CMD + 4);
    /*  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
     */

    /* Controller spec: zero out this buffer. */
    memset(h->reply_pool, 0, h->reply_pool_size);

    bft[7] = SG_ENTRIES_IN_CMD + 4;
    calc_bucket_map(bft, ARRAY_SIZE(bft),
                SG_ENTRIES_IN_CMD, 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(h->nreply_queues, &h->transtable->RepQCount);
    writel(0, &h->transtable->RepQCtrAddrLow32);
    writel(0, &h->transtable->RepQCtrAddrHigh32);

    for (i = 0; i < h->nreply_queues; i++) {
        writel(0, &h->transtable->RepQAddr[i].upper);
        writel(h->reply_pool_dhandle +
            (h->max_commands * sizeof(u64) * i),
            &h->transtable->RepQAddr[i].lower);
    }

    writel(CFGTBL_Trans_Performant | use_short_tags |
        CFGTBL_Trans_enable_directed_msix,
        &(h->cfgtable->HostWrite.TransportRequest));
    writel(CFGTBL_ChangeReq, h->vaddr + SA5_DOORBELL);
    hpsa_wait_for_mode_change_ack(h);
    register_value = readl(&(h->cfgtable->TransportActive));
    if (!(register_value & CFGTBL_Trans_Performant)) {
        dev_warn(&h->pdev->dev, "unable to get board into"
                    " performant mode\n");
        return;
    }
    /* Change the access methods to the performant access methods */
    h->access = SA5_performant_access;
    h->transMethod = CFGTBL_Trans_Performant;
}

static __devinit void hpsa_put_ctlr_into_performant_mode(struct ctlr_info *h)
{
    u32 trans_support;
    int i;

    if (hpsa_simple_mode)
        return;

    trans_support = readl(&(h->cfgtable->TransportSupport));
    if (!(trans_support & PERFORMANT_MODE))
        return;

    h->nreply_queues = h->msix_vector ? MAX_REPLY_QUEUES : 1;
    hpsa_get_max_perf_mode_cmds(h);
    /* Performant mode ring buffer and supporting data structures */
    h->reply_pool_size = h->max_commands * sizeof(u64) * h->nreply_queues;
    h->reply_pool = pci_alloc_consistent(h->pdev, h->reply_pool_size,
                &(h->reply_pool_dhandle));

    for (i = 0; i < h->nreply_queues; i++) {
        h->reply_queue[i].head = &h->reply_pool[h->max_commands * i];
        h->reply_queue[i].size = h->max_commands;
        h->reply_queue[i].wraparound = 1;  /* spec: init to 1 */
        h->reply_queue[i].current_entry = 0;
    }

    /* Need a block fetch table for performant mode */
    h->blockFetchTable = kmalloc(((SG_ENTRIES_IN_CMD + 1) *
                sizeof(u32)), GFP_KERNEL);

    if ((h->reply_pool == NULL)
        || (h->blockFetchTable == NULL))
        goto clean_up;

    hpsa_enter_performant_mode(h,
        trans_support & CFGTBL_Trans_use_short_tags);

    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);