/*
 *    Disk Array driver for HP Smart Array SAS controllers
 *    Copyright 2000, 2009 Hewlett-Packard Development Company, L.P.
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; version 2 of the License.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 *    NON INFRINGEMENT.  See the GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *    Questions/Comments/Bugfixes to iss_storagedev@hp.com
 *
 */

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/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 int 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 void hpsa_put_ctlr_into_performant_mode(struct ctlr_info *h);
static inline u32 next_command(struct ctlr_info *h, u8 q);
static int 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 hpsa_pci_find_memory_BAR(struct pci_dev *pdev,
                                    unsigned long *memory_bar);
static int hpsa_lookup_board_id(struct pci_dev *pdev, u32 *board_id);
static int 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 int 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);
        if (dma_mapping_error(&h->pdev->dev, temp64)) {
                /* prevent subsequent unmapping */
                chain_sg->Addr.lower = 0;
                chain_sg->Addr.upper = 0;
                return -1;
        }
        chain_sg->Addr.lower = (u32) (temp64 & 0x0FFFFFFFFULL);
        chain_sg->Addr.upper = (u32) ((temp64 >> 32) & 0x0FFFFFFFFULL);
        return 0;
}

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 int 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 0;
        }

        addr64 = (u64) pci_map_single(pdev, buf, buflen, data_direction);
        if (dma_mapping_error(&pdev->dev, addr64)) {
                /* Prevent subsequent unmap of something never mapped */
                cp->Header.SGList = 0;
                cp->Header.SGTotal = 0;
                return -1;
        }
        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 */
        return 0;
}

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;
        }

        if (fill_cmd(c, HPSA_INQUIRY, h, buf, bufsize,
                        page, scsi3addr, TYPE_CMD)) {
                rc = -1;
                goto out;
        }
        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;
        }
out:
        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 can't fail here, no data buffer to map. */
        (void) 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));
        if (fill_cmd(c, logical ? HPSA_REPORT_LOG : HPSA_REPORT_PHYS, h,
                buf, bufsize, 0, scsi3addr, TYPE_CMD)) {
                rc = -1;
                goto out;
        }
        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;
        }
out:
        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);
                if (hpsa_map_sg_chain_block(h, cp)) {
                        scsi_dma_unmap(cmd);
                        return -1;
                }
                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 can't fail, no mapping */
                (void) 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 can't fail here, no buffer to map */
        (void) 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;
        int rc = 0;

        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)) {
                                rc = -EFAULT;
                                goto out_kfree;
                        }
                } else {
                        memset(buff, 0, iocommand.buf_size);
                }
        }
        c = cmd_special_alloc(h);
        if (c == NULL) {
                rc = -ENOMEM;
                goto out_kfree;
        }
        /* 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;