[SCSI] qla2xxx: Remove bad call to fc_remove_host() during probe failure.

[safe/jmp/linux-2.6] / drivers / scsi / qla2xxx / qla_os.c

/*
 *                  QLOGIC LINUX SOFTWARE
 *
 * QLogic ISP2x00 device driver for Linux 2.6.x
 * Copyright (C) 2003-2005 QLogic Corporation
 * (www.qlogic.com)
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 */
#include "qla_def.h"

#include <linux/moduleparam.h>
#include <linux/vmalloc.h>
#include <linux/smp_lock.h>
#include <linux/delay.h>

#include <scsi/scsi_tcq.h>
#include <scsi/scsicam.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_fc.h>

/*
 * Driver version
 */
char qla2x00_version_str[40];

/*
 * SRB allocation cache
 */
static kmem_cache_t *srb_cachep;

/*
 * Ioctl related information.
 */
static int num_hosts;

int ql2xlogintimeout = 20;
module_param(ql2xlogintimeout, int, S_IRUGO|S_IRUSR);
MODULE_PARM_DESC(ql2xlogintimeout,
                "Login timeout value in seconds.");

int qlport_down_retry = 30;
module_param(qlport_down_retry, int, S_IRUGO|S_IRUSR);
MODULE_PARM_DESC(qlport_down_retry,
                "Maximum number of command retries to a port that returns"
                "a PORT-DOWN status.");

int ql2xplogiabsentdevice;
module_param(ql2xplogiabsentdevice, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(ql2xplogiabsentdevice,
                "Option to enable PLOGI to devices that are not present after "
                "a Fabric scan.  This is needed for several broken switches."
                "Default is 0 - no PLOGI. 1 - perfom PLOGI.");

int ql2xenablezio = 0;
module_param(ql2xenablezio, int, S_IRUGO|S_IRUSR);
MODULE_PARM_DESC(ql2xenablezio,
                "Option to enable ZIO:If 1 then enable it otherwise"
                " use the default set in the NVRAM."
                " Default is 0 : disabled");

int ql2xintrdelaytimer = 10;
module_param(ql2xintrdelaytimer, int, S_IRUGO|S_IRUSR);
MODULE_PARM_DESC(ql2xintrdelaytimer,
                "ZIO: Waiting time for Firmware before it generates an "
                "interrupt to the host to notify completion of request.");

int ql2xloginretrycount = 0;
module_param(ql2xloginretrycount, int, S_IRUGO|S_IRUSR);
MODULE_PARM_DESC(ql2xloginretrycount,
                "Specify an alternate value for the NVRAM login retry count.");

int ql2xfwloadbin;
module_param(ql2xfwloadbin, int, S_IRUGO|S_IRUSR);
MODULE_PARM_DESC(ql2xfwloadbin,
                "Load ISP2xxx firmware image via hotplug.");

static void qla2x00_free_device(scsi_qla_host_t *);

static void qla2x00_config_dma_addressing(scsi_qla_host_t *ha);

int ql2xfdmienable;
module_param(ql2xfdmienable, int, S_IRUGO|S_IRUSR);
MODULE_PARM_DESC(ql2xfdmienable,
                "Enables FDMI registratons "
                "Default is 0 - no FDMI. 1 - perfom FDMI.");

/*
 * SCSI host template entry points
 */
static int qla2xxx_slave_configure(struct scsi_device * device);
static int qla2xxx_slave_alloc(struct scsi_device *);
static void qla2xxx_slave_destroy(struct scsi_device *);
static int qla2x00_queuecommand(struct scsi_cmnd *cmd,
                void (*fn)(struct scsi_cmnd *));
static int qla24xx_queuecommand(struct scsi_cmnd *cmd,
                void (*fn)(struct scsi_cmnd *));
static int qla2xxx_eh_abort(struct scsi_cmnd *);
static int qla2xxx_eh_device_reset(struct scsi_cmnd *);
static int qla2xxx_eh_bus_reset(struct scsi_cmnd *);
static int qla2xxx_eh_host_reset(struct scsi_cmnd *);
static int qla2x00_loop_reset(scsi_qla_host_t *ha);
static int qla2x00_device_reset(scsi_qla_host_t *, fc_port_t *);

static int qla2x00_change_queue_depth(struct scsi_device *, int);
static int qla2x00_change_queue_type(struct scsi_device *, int);

static struct scsi_host_template qla2x00_driver_template = {
        .module                 = THIS_MODULE,
        .name                   = "qla2xxx",
        .queuecommand           = qla2x00_queuecommand,

        .eh_abort_handler       = qla2xxx_eh_abort,
        .eh_device_reset_handler = qla2xxx_eh_device_reset,
        .eh_bus_reset_handler   = qla2xxx_eh_bus_reset,
        .eh_host_reset_handler  = qla2xxx_eh_host_reset,

        .slave_configure        = qla2xxx_slave_configure,

        .slave_alloc            = qla2xxx_slave_alloc,
        .slave_destroy          = qla2xxx_slave_destroy,
        .change_queue_depth     = qla2x00_change_queue_depth,
        .change_queue_type      = qla2x00_change_queue_type,
        .this_id                = -1,
        .cmd_per_lun            = 3,
        .use_clustering         = ENABLE_CLUSTERING,
        .sg_tablesize           = SG_ALL,

        /*
         * The RISC allows for each command to transfer (2^32-1) bytes of data,
         * which equates to 0x800000 sectors.
         */
        .max_sectors            = 0xFFFF,
        .shost_attrs            = qla2x00_host_attrs,
};

static struct scsi_host_template qla24xx_driver_template = {
        .module                 = THIS_MODULE,
        .name                   = "qla2xxx",
        .queuecommand           = qla24xx_queuecommand,

        .eh_abort_handler       = qla2xxx_eh_abort,
        .eh_device_reset_handler = qla2xxx_eh_device_reset,
        .eh_bus_reset_handler   = qla2xxx_eh_bus_reset,
        .eh_host_reset_handler  = qla2xxx_eh_host_reset,

        .slave_configure        = qla2xxx_slave_configure,

        .slave_alloc            = qla2xxx_slave_alloc,
        .slave_destroy          = qla2xxx_slave_destroy,
        .change_queue_depth     = qla2x00_change_queue_depth,
        .change_queue_type      = qla2x00_change_queue_type,
        .this_id                = -1,
        .cmd_per_lun            = 3,
        .use_clustering         = ENABLE_CLUSTERING,
        .sg_tablesize           = SG_ALL,

        .max_sectors            = 0xFFFF,
        .shost_attrs            = qla2x00_host_attrs,
};

static struct scsi_transport_template *qla2xxx_transport_template = NULL;

/* TODO Convert to inlines
 *
 * Timer routines
 */
#define WATCH_INTERVAL          1       /* number of seconds */

static void qla2x00_timer(scsi_qla_host_t *);

static __inline__ void qla2x00_start_timer(scsi_qla_host_t *,
    void *, unsigned long);
static __inline__ void qla2x00_restart_timer(scsi_qla_host_t *, unsigned long);
static __inline__ void qla2x00_stop_timer(scsi_qla_host_t *);

static inline void
qla2x00_start_timer(scsi_qla_host_t *ha, void *func, unsigned long interval)
{
        init_timer(&ha->timer);
        ha->timer.expires = jiffies + interval * HZ;
        ha->timer.data = (unsigned long)ha;
        ha->timer.function = (void (*)(unsigned long))func;
        add_timer(&ha->timer);
        ha->timer_active = 1;
}

static inline void
qla2x00_restart_timer(scsi_qla_host_t *ha, unsigned long interval)
{
        mod_timer(&ha->timer, jiffies + interval * HZ);
}

static __inline__ void
qla2x00_stop_timer(scsi_qla_host_t *ha)
{
        del_timer_sync(&ha->timer);
        ha->timer_active = 0;
}

static int qla2x00_do_dpc(void *data);

static void qla2x00_rst_aen(scsi_qla_host_t *);

static uint8_t qla2x00_mem_alloc(scsi_qla_host_t *);
static void qla2x00_mem_free(scsi_qla_host_t *ha);
static int qla2x00_allocate_sp_pool( scsi_qla_host_t *ha);
static void qla2x00_free_sp_pool(scsi_qla_host_t *ha);
static void qla2x00_sp_free_dma(scsi_qla_host_t *, srb_t *);
void qla2x00_sp_compl(scsi_qla_host_t *ha, srb_t *);

/* -------------------------------------------------------------------------- */

static char *
qla2x00_pci_info_str(struct scsi_qla_host *ha, char *str)
{
        static char *pci_bus_modes[] = {
                "33", "66", "100", "133",
        };
        uint16_t pci_bus;

        strcpy(str, "PCI");
        pci_bus = (ha->pci_attr & (BIT_9 | BIT_10)) >> 9;
        if (pci_bus) {
                strcat(str, "-X (");
                strcat(str, pci_bus_modes[pci_bus]);
        } else {
                pci_bus = (ha->pci_attr & BIT_8) >> 8;
                strcat(str, " (");
                strcat(str, pci_bus_modes[pci_bus]);
        }
        strcat(str, " MHz)");

        return (str);
}

static char *
qla24xx_pci_info_str(struct scsi_qla_host *ha, char *str)
{
        static char *pci_bus_modes[] = { "33", "66", "100", "133", };
        uint32_t pci_bus;
        int pcie_reg;

        pcie_reg = pci_find_capability(ha->pdev, PCI_CAP_ID_EXP);
        if (pcie_reg) {
                char lwstr[6];
                uint16_t pcie_lstat, lspeed, lwidth;

                pcie_reg += 0x12;
                pci_read_config_word(ha->pdev, pcie_reg, &pcie_lstat);
                lspeed = pcie_lstat & (BIT_0 | BIT_1 | BIT_2 | BIT_3);
                lwidth = (pcie_lstat &
                    (BIT_4 | BIT_5 | BIT_6 | BIT_7 | BIT_8 | BIT_9)) >> 4;

                strcpy(str, "PCIe (");
                if (lspeed == 1)
                        strcat(str, "2.5Gb/s ");
                else
                        strcat(str, "<unknown> ");
                snprintf(lwstr, sizeof(lwstr), "x%d)", lwidth);
                strcat(str, lwstr);

                return str;
        }

        strcpy(str, "PCI");
        pci_bus = (ha->pci_attr & CSRX_PCIX_BUS_MODE_MASK) >> 8;
        if (pci_bus == 0 || pci_bus == 8) {
                strcat(str, " (");
                strcat(str, pci_bus_modes[pci_bus >> 3]);
        } else {
                strcat(str, "-X ");
                if (pci_bus & BIT_2)
                        strcat(str, "Mode 2");
                else
                        strcat(str, "Mode 1");
                strcat(str, " (");
                strcat(str, pci_bus_modes[pci_bus & ~BIT_2]);
        }
        strcat(str, " MHz)");

        return str;
}

char *
qla2x00_fw_version_str(struct scsi_qla_host *ha, char *str)
{
        char un_str[10];

        sprintf(str, "%d.%02d.%02d ", ha->fw_major_version,
            ha->fw_minor_version,
            ha->fw_subminor_version);

        if (ha->fw_attributes & BIT_9) {
                strcat(str, "FLX");
                return (str);
        }

        switch (ha->fw_attributes & 0xFF) {
        case 0x7:
                strcat(str, "EF");
                break;
        case 0x17:
                strcat(str, "TP");
                break;
        case 0x37:
                strcat(str, "IP");
                break;
        case 0x77:
                strcat(str, "VI");
                break;
        default:
                sprintf(un_str, "(%x)", ha->fw_attributes);
                strcat(str, un_str);
                break;
        }
        if (ha->fw_attributes & 0x100)
                strcat(str, "X");

        return (str);
}

char *
qla24xx_fw_version_str(struct scsi_qla_host *ha, char *str)
{
        sprintf(str, "%d.%02d.%02d ", ha->fw_major_version,
            ha->fw_minor_version,
            ha->fw_subminor_version);

        if (ha->fw_attributes & BIT_0)
                strcat(str, "[Class 2] ");
        if (ha->fw_attributes & BIT_1)
                strcat(str, "[IP] ");
        if (ha->fw_attributes & BIT_2)
                strcat(str, "[Multi-ID] ");
        if (ha->fw_attributes & BIT_13)
                strcat(str, "[Experimental]");
        return str;
}

static inline srb_t *
qla2x00_get_new_sp(scsi_qla_host_t *ha, fc_port_t *fcport,
    struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
{
        srb_t *sp;

        sp = mempool_alloc(ha->srb_mempool, GFP_ATOMIC);
        if (!sp)
                return sp;

        atomic_set(&sp->ref_count, 1);
        sp->ha = ha;
        sp->fcport = fcport;
        sp->cmd = cmd;
        sp->flags = 0;
        CMD_SP(cmd) = (void *)sp;
        cmd->scsi_done = done;

        return sp;
}

static int
qla2x00_queuecommand(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
{
        scsi_qla_host_t *ha = to_qla_host(cmd->device->host);
        fc_port_t *fcport = (struct fc_port *) cmd->device->hostdata;
        srb_t *sp;
        int rval;

        if (!fcport) {
                cmd->result = DID_NO_CONNECT << 16;
                goto qc_fail_command;
        }

        if (atomic_read(&fcport->state) != FCS_ONLINE) {
                if (atomic_read(&fcport->state) == FCS_DEVICE_DEAD ||
                    atomic_read(&ha->loop_state) == LOOP_DEAD) {
                        cmd->result = DID_NO_CONNECT << 16;
                        goto qc_fail_command;
                }
                goto qc_host_busy;
        }

        spin_unlock_irq(ha->host->host_lock);

        sp = qla2x00_get_new_sp(ha, fcport, cmd, done);
        if (!sp)
                goto qc_host_busy_lock;

        rval = qla2x00_start_scsi(sp);
        if (rval != QLA_SUCCESS)
                goto qc_host_busy_free_sp;

        /* Manage unprocessed RIO/ZIO commands in response queue. */
        if (ha->flags.online && ha->flags.process_response_queue &&
            ha->response_ring_ptr->signature != RESPONSE_PROCESSED) {
                unsigned long flags;

                spin_lock_irqsave(&ha->hardware_lock, flags);
                qla2x00_process_response_queue(ha);
                spin_unlock_irqrestore(&ha->hardware_lock, flags);
        }

        spin_lock_irq(ha->host->host_lock);

        return 0;

qc_host_busy_free_sp:
        qla2x00_sp_free_dma(ha, sp);
        mempool_free(sp, ha->srb_mempool);

qc_host_busy_lock:
        spin_lock_irq(ha->host->host_lock);

qc_host_busy:
        return SCSI_MLQUEUE_HOST_BUSY;

qc_fail_command:
        done(cmd);

        return 0;
}


static int
qla24xx_queuecommand(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
{
        scsi_qla_host_t *ha = to_qla_host(cmd->device->host);
        fc_port_t *fcport = (struct fc_port *) cmd->device->hostdata;
        srb_t *sp;
        int rval;

        if (!fcport) {
                cmd->result = DID_NO_CONNECT << 16;
                goto qc24_fail_command;
        }

        if (atomic_read(&fcport->state) != FCS_ONLINE) {
                if (atomic_read(&fcport->state) == FCS_DEVICE_DEAD ||
                    atomic_read(&ha->loop_state) == LOOP_DEAD) {
                        cmd->result = DID_NO_CONNECT << 16;
                        goto qc24_fail_command;
                }
                goto qc24_host_busy;
        }

        spin_unlock_irq(ha->host->host_lock);

        sp = qla2x00_get_new_sp(ha, fcport, cmd, done);
        if (!sp)
                goto qc24_host_busy_lock;

        rval = qla24xx_start_scsi(sp);
        if (rval != QLA_SUCCESS)
                goto qc24_host_busy_free_sp;

        spin_lock_irq(ha->host->host_lock);

        return 0;

qc24_host_busy_free_sp:
        qla2x00_sp_free_dma(ha, sp);
        mempool_free(sp, ha->srb_mempool);

qc24_host_busy_lock:
        spin_lock_irq(ha->host->host_lock);

qc24_host_busy:
        return SCSI_MLQUEUE_HOST_BUSY;

qc24_fail_command:
        done(cmd);

        return 0;
}


/*
 * qla2x00_eh_wait_on_command
 *    Waits for the command to be returned by the Firmware for some
 *    max time.
 *
 * Input:
 *    ha = actual ha whose done queue will contain the command
 *            returned by firmware.
 *    cmd = Scsi Command to wait on.
 *    flag = Abort/Reset(Bus or Device Reset)
 *
 * Return:
 *    Not Found : 0
 *    Found : 1
 */
static int
qla2x00_eh_wait_on_command(scsi_qla_host_t *ha, struct scsi_cmnd *cmd)
{
#define ABORT_POLLING_PERIOD    HZ
#define ABORT_WAIT_ITER         ((10 * HZ) / (ABORT_POLLING_PERIOD))
        unsigned long wait_iter = ABORT_WAIT_ITER;
        int ret = QLA_SUCCESS;

        while (CMD_SP(cmd)) {
                set_current_state(TASK_UNINTERRUPTIBLE);
                schedule_timeout(ABORT_POLLING_PERIOD);

                if (--wait_iter)
                        break;
        }
        if (CMD_SP(cmd))
                ret = QLA_FUNCTION_FAILED;

        return ret;
}

/*
 * qla2x00_wait_for_hba_online
 *    Wait till the HBA is online after going through
 *    <= MAX_RETRIES_OF_ISP_ABORT  or
 *    finally HBA is disabled ie marked offline
 *
 * Input:
 *     ha - pointer to host adapter structure
 *
 * Note:
 *    Does context switching-Release SPIN_LOCK
 *    (if any) before calling this routine.
 *
 * Return:
 *    Success (Adapter is online) : 0
 *    Failed  (Adapter is offline/disabled) : 1
 */
static int
qla2x00_wait_for_hba_online(scsi_qla_host_t *ha)
{
        int             return_status;
        unsigned long   wait_online;

        wait_online = jiffies + (MAX_LOOP_TIMEOUT * HZ);
        while (((test_bit(ISP_ABORT_NEEDED, &ha->dpc_flags)) ||
            test_bit(ABORT_ISP_ACTIVE, &ha->dpc_flags) ||
            test_bit(ISP_ABORT_RETRY, &ha->dpc_flags) ||
            ha->dpc_active) && time_before(jiffies, wait_online)) {

                msleep(1000);
        }
        if (ha->flags.online)
                return_status = QLA_SUCCESS;
        else
                return_status = QLA_FUNCTION_FAILED;

        DEBUG2(printk("%s return_status=%d\n",__func__,return_status));

        return (return_status);
}

/*
 * qla2x00_wait_for_loop_ready
 *    Wait for MAX_LOOP_TIMEOUT(5 min) value for loop
 *    to be in LOOP_READY state.
 * Input:
 *     ha - pointer to host adapter structure
 *
 * Note:
 *    Does context switching-Release SPIN_LOCK
 *    (if any) before calling this routine.
 *
 *
 * Return:
 *    Success (LOOP_READY) : 0
 *    Failed  (LOOP_NOT_READY) : 1
 */
static inline int
qla2x00_wait_for_loop_ready(scsi_qla_host_t *ha)
{
        int      return_status = QLA_SUCCESS;
        unsigned long loop_timeout ;

        /* wait for 5 min at the max for loop to be ready */
        loop_timeout = jiffies + (MAX_LOOP_TIMEOUT * HZ);

        while ((!atomic_read(&ha->loop_down_timer) &&
            atomic_read(&ha->loop_state) == LOOP_DOWN) ||
            atomic_read(&ha->loop_state) != LOOP_READY) {
                msleep(1000);
                if (time_after_eq(jiffies, loop_timeout)) {
                        return_status = QLA_FUNCTION_FAILED;
                        break;
                }
        }
        return (return_status);
}

/**************************************************************************
* qla2xxx_eh_abort
*
* Description:
*    The abort function will abort the specified command.
*
* Input:
*    cmd = Linux SCSI command packet to be aborted.
*
* Returns:
*    Either SUCCESS or FAILED.
*
* Note:
**************************************************************************/
int
qla2xxx_eh_abort(struct scsi_cmnd *cmd)
{
        scsi_qla_host_t *ha = to_qla_host(cmd->device->host);
        srb_t *sp;
        int ret, i;
        unsigned int id, lun;
        unsigned long serial;
        unsigned long flags;

        if (!CMD_SP(cmd))
                return FAILED;

        ret = FAILED;

        id = cmd->device->id;
        lun = cmd->device->lun;
        serial = cmd->serial_number;

        /* Check active list for command command. */
        spin_lock_irqsave(&ha->hardware_lock, flags);
        for (i = 1; i < MAX_OUTSTANDING_COMMANDS; i++) {
                sp = ha->outstanding_cmds[i];

                if (sp == NULL)
                        continue;

                if (sp->cmd != cmd)
                        continue;

                DEBUG2(printk("%s(%ld): aborting sp %p from RISC. pid=%ld "
                    "sp->state=%x\n", __func__, ha->host_no, sp, serial,
                    sp->state));
                DEBUG3(qla2x00_print_scsi_cmd(cmd);)

                spin_unlock_irqrestore(&ha->hardware_lock, flags);
                if (ha->isp_ops.abort_command(ha, sp)) {
                        DEBUG2(printk("%s(%ld): abort_command "
                            "mbx failed.\n", __func__, ha->host_no));
                } else {
                        DEBUG3(printk("%s(%ld): abort_command "
                            "mbx success.\n", __func__, ha->host_no));
                        ret = SUCCESS;
                }
                spin_lock_irqsave(&ha->hardware_lock, flags);

                break;
        }
        spin_unlock_irqrestore(&ha->hardware_lock, flags);

        /* Wait for the command to be returned. */
        if (ret == SUCCESS) {
                if (qla2x00_eh_wait_on_command(ha, cmd) != QLA_SUCCESS) {
                        qla_printk(KERN_ERR, ha,
                            "scsi(%ld:%d:%d): Abort handler timed out -- %lx "
                            "%x.\n", ha->host_no, id, lun, serial, ret);
                }
        }

        qla_printk(KERN_INFO, ha,
            "scsi(%ld:%d:%d): Abort command issued -- %lx %x.\n", ha->host_no,
            id, lun, serial, ret);

        return ret;
}

/**************************************************************************
* qla2x00_eh_wait_for_pending_target_commands
*
* Description:
*    Waits for all the commands to come back from the specified target.
*
* Input:
*    ha - pointer to scsi_qla_host structure.
*    t  - target
* Returns:
*    Either SUCCESS or FAILED.
*
* Note:
**************************************************************************/
static int
qla2x00_eh_wait_for_pending_target_commands(scsi_qla_host_t *ha, unsigned int t)
{
        int     cnt;
        int     status;
        srb_t           *sp;
        struct scsi_cmnd *cmd;
        unsigned long flags;

        status = 0;

        /*
         * Waiting for all commands for the designated target in the active
         * array
         */
        for (cnt = 1; cnt < MAX_OUTSTANDING_COMMANDS; cnt++) {
                spin_lock_irqsave(&ha->hardware_lock, flags);
                sp = ha->outstanding_cmds[cnt];
                if (sp) {
                        cmd = sp->cmd;
                        spin_unlock_irqrestore(&ha->hardware_lock, flags);
                        if (cmd->device->id == t) {
                                if (!qla2x00_eh_wait_on_command(ha, cmd)) {
                                        status = 1;
                                        break;
                                }
                        }
                } else {
                        spin_unlock_irqrestore(&ha->hardware_lock, flags);
                }
        }
        return (status);
}


/**************************************************************************
* qla2xxx_eh_device_reset
*
* Description:
*    The device reset function will reset the target and abort any
*    executing commands.
*
*    NOTE: The use of SP is undefined within this context.  Do *NOT*
*          attempt to use this value, even if you determine it is
*          non-null.
*
* Input:
*    cmd = Linux SCSI command packet of the command that cause the
*          bus device reset.
*
* Returns:
*    SUCCESS/FAILURE (defined as macro in scsi.h).
*
**************************************************************************/
int
qla2xxx_eh_device_reset(struct scsi_cmnd *cmd)
{
        scsi_qla_host_t *ha = to_qla_host(cmd->device->host);
        fc_port_t *fcport = (struct fc_port *) cmd->device->hostdata;
        srb_t *sp;
        int ret;
        unsigned int id, lun;
        unsigned long serial;

        ret = FAILED;

        id = cmd->device->id;
        lun = cmd->device->lun;
        serial = cmd->serial_number;

        sp = (srb_t *) CMD_SP(cmd);
        if (!sp || !fcport)
                return ret;

        qla_printk(KERN_INFO, ha,
            "scsi(%ld:%d:%d): DEVICE RESET ISSUED.\n", ha->host_no, id, lun);

        if (qla2x00_wait_for_hba_online(ha) != QLA_SUCCESS)
                goto eh_dev_reset_done;

        if (qla2x00_wait_for_loop_ready(ha) == QLA_SUCCESS) {
                if (qla2x00_device_reset(ha, fcport) == 0)
                        ret = SUCCESS;

#if defined(LOGOUT_AFTER_DEVICE_RESET)
                if (ret == SUCCESS) {
                        if (fcport->flags & FC_FABRIC_DEVICE) {
                                ha->isp_ops.fabric_logout(ha, fcport->loop_id);
                                qla2x00_mark_device_lost(ha, fcport);
                        }
                }
#endif
        } else {
                DEBUG2(printk(KERN_INFO
                    "%s failed: loop not ready\n",__func__);)
        }

        if (ret == FAILED) {
                DEBUG3(printk("%s(%ld): device reset failed\n",
                    __func__, ha->host_no));
                qla_printk(KERN_INFO, ha, "%s: device reset failed\n",
                    __func__);

                goto eh_dev_reset_done;
        }

        /*
         * If we are coming down the EH path, wait for all commands to
         * complete for the device.
         */
        if (cmd->device->host->eh_active) {
                if (qla2x00_eh_wait_for_pending_target_commands(ha, id))
                        ret = FAILED;

                if (ret == FAILED) {
                        DEBUG3(printk("%s(%ld): failed while waiting for "
                            "commands\n", __func__, ha->host_no));
                        qla_printk(KERN_INFO, ha,
                            "%s: failed while waiting for commands\n",
                            __func__);

                        goto eh_dev_reset_done;
                }
        }

        qla_printk(KERN_INFO, ha,
            "scsi(%ld:%d:%d): DEVICE RESET SUCCEEDED.\n", ha->host_no, id, lun);

eh_dev_reset_done:
        return ret;
}

/**************************************************************************
* qla2x00_eh_wait_for_pending_commands
*
* Description:
*    Waits for all the commands to come back from the specified host.
*
* Input:
*    ha - pointer to scsi_qla_host structure.
*
* Returns:
*    1 : SUCCESS
*    0 : FAILED
*
* Note:
**************************************************************************/
static int
qla2x00_eh_wait_for_pending_commands(scsi_qla_host_t *ha)
{
        int     cnt;
        int     status;
        srb_t           *sp;
        struct scsi_cmnd *cmd;
        unsigned long flags;

        status = 1;

        /*
         * Waiting for all commands for the designated target in the active
         * array
         */
        for (cnt = 1; cnt < MAX_OUTSTANDING_COMMANDS; cnt++) {
                spin_lock_irqsave(&ha->hardware_lock, flags);
                sp = ha->outstanding_cmds[cnt];
                if (sp) {
                        cmd = sp->cmd;
                        spin_unlock_irqrestore(&ha->hardware_lock, flags);
                        status = qla2x00_eh_wait_on_command(ha, cmd);
                        if (status == 0)
                                break;
                }
                else {
                        spin_unlock_irqrestore(&ha->hardware_lock, flags);
                }
        }
        return (status);
}


/**************************************************************************
* qla2xxx_eh_bus_reset
*
* Description:
*    The bus reset function will reset the bus and abort any executing
*    commands.
*
* Input:
*    cmd = Linux SCSI command packet of the command that cause the
*          bus reset.
*
* Returns:
*    SUCCESS/FAILURE (defined as macro in scsi.h).
*
**************************************************************************/
int
qla2xxx_eh_bus_reset(struct scsi_cmnd *cmd)
{
        scsi_qla_host_t *ha = to_qla_host(cmd->device->host);
        fc_port_t *fcport = (struct fc_port *) cmd->device->hostdata;
        srb_t *sp;
        int ret;
        unsigned int id, lun;
        unsigned long serial;

        ret = FAILED;

        id = cmd->device->id;
        lun = cmd->device->lun;
        serial = cmd->serial_number;

        sp = (srb_t *) CMD_SP(cmd);
        if (!sp || !fcport)
                return ret;

        qla_printk(KERN_INFO, ha,
            "scsi(%ld:%d:%d): LOOP RESET ISSUED.\n", ha->host_no, id, lun);

        if (qla2x00_wait_for_hba_online(ha) != QLA_SUCCESS) {
                DEBUG2(printk("%s failed:board disabled\n",__func__));
                goto eh_bus_reset_done;
        }

        if (qla2x00_wait_for_loop_ready(ha) == QLA_SUCCESS) {
                if (qla2x00_loop_reset(ha) == QLA_SUCCESS)
                        ret = SUCCESS;
        }
        if (ret == FAILED)
                goto eh_bus_reset_done;

        /* Waiting for our command in done_queue to be returned to OS.*/
        if (cmd->device->host->eh_active)
                if (!qla2x00_eh_wait_for_pending_commands(ha))
                        ret = FAILED;

eh_bus_reset_done:
        qla_printk(KERN_INFO, ha, "%s: reset %s\n", __func__,
            (ret == FAILED) ? "failed" : "succeded");

        return ret;
}

/**************************************************************************
* qla2xxx_eh_host_reset
*
* Description:
*    The reset function will reset the Adapter.
*
* Input:
*      cmd = Linux SCSI command packet of the command that cause the
*            adapter reset.
*
* Returns:
*      Either SUCCESS or FAILED.
*
* Note:
**************************************************************************/
int
qla2xxx_eh_host_reset(struct scsi_cmnd *cmd)
{
        scsi_qla_host_t *ha = to_qla_host(cmd->device->host);
        fc_port_t *fcport = (struct fc_port *) cmd->device->hostdata;
        srb_t *sp;
        int ret;
        unsigned int id, lun;
        unsigned long serial;

        ret = FAILED;

        id = cmd->device->id;
        lun = cmd->device->lun;
        serial = cmd->serial_number;

        sp = (srb_t *) CMD_SP(cmd);
        if (!sp || !fcport)
                return ret;

        qla_printk(KERN_INFO, ha,
            "scsi(%ld:%d:%d): ADAPTER RESET ISSUED.\n", ha->host_no, id, lun);

        if (qla2x00_wait_for_hba_online(ha) != QLA_SUCCESS)
                goto eh_host_reset_lock;

        /*
         * Fixme-may be dpc thread is active and processing
         * loop_resync,so wait a while for it to
         * be completed and then issue big hammer.Otherwise
         * it may cause I/O failure as big hammer marks the
         * devices as lost kicking of the port_down_timer
         * while dpc is stuck for the mailbox to complete.
         */
        qla2x00_wait_for_loop_ready(ha);
        set_bit(ABORT_ISP_ACTIVE, &ha->dpc_flags);
        if (qla2x00_abort_isp(ha)) {
                clear_bit(ABORT_ISP_ACTIVE, &ha->dpc_flags);
                /* failed. schedule dpc to try */
                set_bit(ISP_ABORT_NEEDED, &ha->dpc_flags);

                if (qla2x00_wait_for_hba_online(ha) != QLA_SUCCESS)
                        goto eh_host_reset_lock;
        }
        clear_bit(ABORT_ISP_ACTIVE, &ha->dpc_flags);

        /* Waiting for our command in done_queue to be returned to OS.*/
        if (qla2x00_eh_wait_for_pending_commands(ha))
                ret = SUCCESS;

eh_host_reset_lock:
        qla_printk(KERN_INFO, ha, "%s: reset %s\n", __func__,
            (ret == FAILED) ? "failed" : "succeded");

        return ret;
}

/*
* qla2x00_loop_reset
*      Issue loop reset.
*
* Input:
*      ha = adapter block pointer.
*
* Returns:
*      0 = success
*/
static int
qla2x00_loop_reset(scsi_qla_host_t *ha)
{
        int status = QLA_SUCCESS;
        struct fc_port *fcport;

        if (ha->flags.enable_lip_reset) {
                status = qla2x00_lip_reset(ha);
        }

        if (status == QLA_SUCCESS && ha->flags.enable_target_reset) {
                list_for_each_entry(fcport, &ha->fcports, list) {
                        if (fcport->port_type != FCT_TARGET)
                                continue;

                        status = qla2x00_device_reset(ha, fcport);
                        if (status != QLA_SUCCESS)
                                break;
                }
        }

        if (status == QLA_SUCCESS &&
                ((!ha->flags.enable_target_reset &&
                  !ha->flags.enable_lip_reset) ||
                ha->flags.enable_lip_full_login)) {

                status = qla2x00_full_login_lip(ha);
        }

        /* Issue marker command only when we are going to start the I/O */
        ha->marker_needed = 1;

        if (status) {
                /* Empty */
                DEBUG2_3(printk("%s(%ld): **** FAILED ****\n",
                                __func__,
                                ha->host_no);)
        } else {
                /* Empty */
                DEBUG3(printk("%s(%ld): exiting normally.\n",
                                __func__,
                                ha->host_no);)
        }

        return(status);
}

/*
 * qla2x00_device_reset
 *      Issue bus device reset message to the target.
 *
 * Input:
 *      ha = adapter block pointer.
 *      t = SCSI ID.
 *      TARGET_QUEUE_LOCK must be released.
 *      ADAPTER_STATE_LOCK must be released.
 *
 * Context:
 *      Kernel context.
 */
static int
qla2x00_device_reset(scsi_qla_host_t *ha, fc_port_t *reset_fcport)
{
        /* Abort Target command will clear Reservation */
        return ha->isp_ops.abort_target(reset_fcport);
}

static int
qla2xxx_slave_alloc(struct scsi_device *sdev)
{
        struct fc_rport *rport = starget_to_rport(scsi_target(sdev));

        if (!rport)
                return -ENXIO;

        sdev->hostdata = rport->dd_data;

        return 0;
}

static int
qla2xxx_slave_configure(struct scsi_device *sdev)
{
        scsi_qla_host_t *ha = to_qla_host(sdev->host);
        struct fc_rport *rport = starget_to_rport(sdev->sdev_target);

        if (sdev->tagged_supported)
                scsi_activate_tcq(sdev, 32);
        else
                scsi_deactivate_tcq(sdev, 32);

        rport->dev_loss_tmo = ha->port_down_retry_count + 5;

        return 0;
}

static void
qla2xxx_slave_destroy(struct scsi_device *sdev)
{
        sdev->hostdata = NULL;
}

static int
qla2x00_change_queue_depth(struct scsi_device *sdev, int qdepth)
{
        scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
        return sdev->queue_depth;
}

static int
qla2x00_change_queue_type(struct scsi_device *sdev, int tag_type)
{
        if (sdev->tagged_supported) {
                scsi_set_tag_type(sdev, tag_type);
                if (tag_type)
                        scsi_activate_tcq(sdev, sdev->queue_depth);
                else
                        scsi_deactivate_tcq(sdev, sdev->queue_depth);
        } else
                tag_type = 0;

        return tag_type;
}

/**
 * qla2x00_config_dma_addressing() - Configure OS DMA addressing method.
 * @ha: HA context
 *
 * At exit, the @ha's flags.enable_64bit_addressing set to indicated
 * supported addressing method.
 */
static void
qla2x00_config_dma_addressing(scsi_qla_host_t *ha)
{
        /* Assume a 32bit DMA mask. */
        ha->flags.enable_64bit_addressing = 0;

        if (!dma_set_mask(&ha->pdev->dev, DMA_64BIT_MASK)) {
                /* Any upper-dword bits set? */
                if (MSD(dma_get_required_mask(&ha->pdev->dev)) &&
                    !pci_set_consistent_dma_mask(ha->pdev, DMA_64BIT_MASK)) {
                        /* Ok, a 64bit DMA mask is applicable. */
                        ha->flags.enable_64bit_addressing = 1;
                        ha->isp_ops.calc_req_entries = qla2x00_calc_iocbs_64;
                        ha->isp_ops.build_iocbs = qla2x00_build_scsi_iocbs_64;
                        return;
                }
        }

        dma_set_mask(&ha->pdev->dev, DMA_32BIT_MASK);
        pci_set_consistent_dma_mask(ha->pdev, DMA_32BIT_MASK);
}

static int
qla2x00_iospace_config(scsi_qla_host_t *ha)
{
        unsigned long   pio, pio_len, pio_flags;
        unsigned long   mmio, mmio_len, mmio_flags;

        /* We only need PIO for Flash operations on ISP2312 v2 chips. */
        pio = pci_resource_start(ha->pdev, 0);
        pio_len = pci_resource_len(ha->pdev, 0);
        pio_flags = pci_resource_flags(ha->pdev, 0);
        if (pio_flags & IORESOURCE_IO) {
                if (pio_len < MIN_IOBASE_LEN) {
                        qla_printk(KERN_WARNING, ha,
                            "Invalid PCI I/O region size (%s)...\n",
                                pci_name(ha->pdev));
                        pio = 0;
                }
        } else {
                qla_printk(KERN_WARNING, ha,
                    "region #0 not a PIO resource (%s)...\n",
                    pci_name(ha->pdev));
                pio = 0;
        }

        /* Use MMIO operations for all accesses. */
        mmio = pci_resource_start(ha->pdev, 1);
        mmio_len = pci_resource_len(ha->pdev, 1);
        mmio_flags = pci_resource_flags(ha->pdev, 1);

        if (!(mmio_flags & IORESOURCE_MEM)) {
                qla_printk(KERN_ERR, ha,
                    "region #0 not an MMIO resource (%s), aborting\n",
                    pci_name(ha->pdev));
                goto iospace_error_exit;
        }
        if (mmio_len < MIN_IOBASE_LEN) {
                qla_printk(KERN_ERR, ha,
                    "Invalid PCI mem region size (%s), aborting\n",
                        pci_name(ha->pdev));
                goto iospace_error_exit;
        }

        if (pci_request_regions(ha->pdev, ha->brd_info->drv_name)) {
                qla_printk(KERN_WARNING, ha,
                    "Failed to reserve PIO/MMIO regions (%s)\n",
                    pci_name(ha->pdev));

                goto iospace_error_exit;
        }

        ha->pio_address = pio;
        ha->pio_length = pio_len;
        ha->iobase = ioremap(mmio, MIN_IOBASE_LEN);
        if (!ha->iobase) {
                qla_printk(KERN_ERR, ha,
                    "cannot remap MMIO (%s), aborting\n", pci_name(ha->pdev));

                goto iospace_error_exit;
        }

        return (0);

iospace_error_exit:
        return (-ENOMEM);
}

static void
qla2x00_enable_intrs(scsi_qla_host_t *ha)
{
        unsigned long flags = 0;
        struct device_reg_2xxx __iomem *reg = &ha->iobase->isp;

        spin_lock_irqsave(&ha->hardware_lock, flags);
        ha->interrupts_on = 1;
        /* enable risc and host interrupts */
        WRT_REG_WORD(&reg->ictrl, ICR_EN_INT | ICR_EN_RISC);
        RD_REG_WORD(&reg->ictrl);
        spin_unlock_irqrestore(&ha->hardware_lock, flags);

}

static void
qla2x00_disable_intrs(scsi_qla_host_t *ha)
{
        unsigned long flags = 0;
        struct device_reg_2xxx __iomem *reg = &ha->iobase->isp;

        spin_lock_irqsave(&ha->hardware_lock, flags);
        ha->interrupts_on = 0;
        /* disable risc and host interrupts */
        WRT_REG_WORD(&reg->ictrl, 0);
        RD_REG_WORD(&reg->ictrl);
        spin_unlock_irqrestore(&ha->hardware_lock, flags);
}

static void
qla24xx_enable_intrs(scsi_qla_host_t *ha)
{
        unsigned long flags = 0;
        struct device_reg_24xx __iomem *reg = &ha->iobase->isp24;

        spin_lock_irqsave(&ha->hardware_lock, flags);
        ha->interrupts_on = 1;
        WRT_REG_DWORD(&reg->ictrl, ICRX_EN_RISC_INT);
        RD_REG_DWORD(&reg->ictrl);
        spin_unlock_irqrestore(&ha->hardware_lock, flags);
}

static void
qla24xx_disable_intrs(scsi_qla_host_t *ha)
{
        unsigned long flags = 0;
        struct device_reg_24xx __iomem *reg = &ha->iobase->isp24;

        spin_lock_irqsave(&ha->hardware_lock, flags);
        ha->interrupts_on = 0;
        WRT_REG_DWORD(&reg->ictrl, 0);
        RD_REG_DWORD(&reg->ictrl);
        spin_unlock_irqrestore(&ha->hardware_lock, flags);
}

/*
 * PCI driver interface
 */
int qla2x00_probe_one(struct pci_dev *pdev, struct qla_board_info *brd_info)
{
        int     ret = -ENODEV;
        device_reg_t __iomem *reg;
        struct Scsi_Host *host;
        scsi_qla_host_t *ha;
        unsigned long   flags = 0;
        unsigned long   wait_switch = 0;
        char pci_info[20];
        char fw_str[30];
        fc_port_t *fcport;

        if (pci_enable_device(pdev))
                goto probe_out;

        host = scsi_host_alloc(brd_info->sht ? brd_info->sht:
            &qla2x00_driver_template, sizeof(scsi_qla_host_t));
        if (host == NULL) {
                printk(KERN_WARNING
                    "qla2xxx: Couldn't allocate host from scsi layer!\n");
                goto probe_disable_device;
        }

        /* Clear our data area */
        ha = (scsi_qla_host_t *)host->hostdata;
        memset(ha, 0, sizeof(scsi_qla_host_t));

        ha->pdev = pdev;
        ha->host = host;
        ha->host_no = host->host_no;
        ha->brd_info = brd_info;
        sprintf(ha->host_str, "%s_%ld", ha->brd_info->drv_name, ha->host_no);

        /* Configure PCI I/O space */
        ret = qla2x00_iospace_config(ha);
        if (ret)
                goto probe_failed;

        qla_printk(KERN_INFO, ha,
            "Found an %s, irq %d, iobase 0x%p\n", ha->brd_info->isp_name,
            pdev->irq, ha->iobase);

        spin_lock_init(&ha->hardware_lock);

        ha->prev_topology = 0;
        ha->ports = MAX_BUSES;
        ha->init_cb_size = sizeof(init_cb_t);
        ha->mgmt_svr_loop_id = MANAGEMENT_SERVER;

        /* Assign ISP specific operations. */
        ha->isp_ops.pci_config          = qla2100_pci_config;
        ha->isp_ops.reset_chip          = qla2x00_reset_chip;
        ha->isp_ops.chip_diag           = qla2x00_chip_diag;
        ha->isp_ops.config_rings        = qla2x00_config_rings;
        ha->isp_ops.reset_adapter       = qla2x00_reset_adapter;
        ha->isp_ops.nvram_config        = qla2x00_nvram_config;
        ha->isp_ops.update_fw_options   = qla2x00_update_fw_options;
        ha->isp_ops.load_risc           = qla2x00_load_risc;
        ha->isp_ops.pci_info_str        = qla2x00_pci_info_str;
        ha->isp_ops.fw_version_str      = qla2x00_fw_version_str;
        ha->isp_ops.intr_handler        = qla2100_intr_handler;
        ha->isp_ops.enable_intrs        = qla2x00_enable_intrs;
        ha->isp_ops.disable_intrs       = qla2x00_disable_intrs;
        ha->isp_ops.abort_command       = qla2x00_abort_command;
        ha->isp_ops.abort_target        = qla2x00_abort_target;
        ha->isp_ops.fabric_login        = qla2x00_login_fabric;
        ha->isp_ops.fabric_logout       = qla2x00_fabric_logout;
        ha->isp_ops.calc_req_entries    = qla2x00_calc_iocbs_32;
        ha->isp_ops.build_iocbs         = qla2x00_build_scsi_iocbs_32;
        ha->isp_ops.prep_ms_iocb        = qla2x00_prep_ms_iocb;
        ha->isp_ops.prep_ms_fdmi_iocb   = qla2x00_prep_ms_fdmi_iocb;
        ha->isp_ops.read_nvram          = qla2x00_read_nvram_data;
        ha->isp_ops.write_nvram         = qla2x00_write_nvram_data;
        ha->isp_ops.fw_dump             = qla2100_fw_dump;
        ha->isp_ops.ascii_fw_dump       = qla2100_ascii_fw_dump;
        if (IS_QLA2100(ha)) {
                host->max_id = MAX_TARGETS_2100;
                ha->mbx_count = MAILBOX_REGISTER_COUNT_2100;
                ha->request_q_length = REQUEST_ENTRY_CNT_2100;
                ha->response_q_length = RESPONSE_ENTRY_CNT_2100;
                ha->last_loop_id = SNS_LAST_LOOP_ID_2100;
                host->sg_tablesize = 32;
                ha->gid_list_info_size = 4;
        } else if (IS_QLA2200(ha)) {
                host->max_id = MAX_TARGETS_2200;
                ha->mbx_count = MAILBOX_REGISTER_COUNT;
                ha->request_q_length = REQUEST_ENTRY_CNT_2200;
                ha->response_q_length = RESPONSE_ENTRY_CNT_2100;
                ha->last_loop_id = SNS_LAST_LOOP_ID_2100;
                ha->gid_list_info_size = 4;
        } else if (IS_QLA23XX(ha)) {
                host->max_id = MAX_TARGETS_2200;
                ha->mbx_count = MAILBOX_REGISTER_COUNT;
                ha->request_q_length = REQUEST_ENTRY_CNT_2200;
                ha->response_q_length = RESPONSE_ENTRY_CNT_2300;
                ha->last_loop_id = SNS_LAST_LOOP_ID_2300;
                ha->isp_ops.pci_config = qla2300_pci_config;
                ha->isp_ops.intr_handler = qla2300_intr_handler;
                ha->isp_ops.fw_dump = qla2300_fw_dump;
                ha->isp_ops.ascii_fw_dump = qla2300_ascii_fw_dump;
                ha->gid_list_info_size = 6;
        } else if (IS_QLA24XX(ha) || IS_QLA25XX(ha)) {
                host->max_id = MAX_TARGETS_2200;
                ha->mbx_count = MAILBOX_REGISTER_COUNT;
                ha->request_q_length = REQUEST_ENTRY_CNT_24XX;
                ha->response_q_length = RESPONSE_ENTRY_CNT_2300;
                ha->last_loop_id = SNS_LAST_LOOP_ID_2300;
                ha->init_cb_size = sizeof(struct init_cb_24xx);
                ha->mgmt_svr_loop_id = 10;
                ha->isp_ops.pci_config = qla24xx_pci_config;
                ha->isp_ops.reset_chip = qla24xx_reset_chip;
                ha->isp_ops.chip_diag = qla24xx_chip_diag;
                ha->isp_ops.config_rings = qla24xx_config_rings;
                ha->isp_ops.reset_adapter = qla24xx_reset_adapter;
                ha->isp_ops.nvram_config = qla24xx_nvram_config;
                ha->isp_ops.update_fw_options = qla24xx_update_fw_options;
                ha->isp_ops.load_risc = qla24xx_load_risc_flash;
                if (ql2xfwloadbin)
                        ha->isp_ops.load_risc = qla24xx_load_risc_hotplug;
                ha->isp_ops.pci_info_str = qla24xx_pci_info_str;
                ha->isp_ops.fw_version_str = qla24xx_fw_version_str;
                ha->isp_ops.intr_handler = qla24xx_intr_handler;
                ha->isp_ops.enable_intrs = qla24xx_enable_intrs;
                ha->isp_ops.disable_intrs = qla24xx_disable_intrs;
                ha->isp_ops.abort_command = qla24xx_abort_command;
                ha->isp_ops.abort_target = qla24xx_abort_target;
                ha->isp_ops.fabric_login = qla24xx_login_fabric;
                ha->isp_ops.fabric_logout = qla24xx_fabric_logout;
                ha->isp_ops.prep_ms_iocb = qla24xx_prep_ms_iocb;
                ha->isp_ops.prep_ms_fdmi_iocb = qla24xx_prep_ms_fdmi_iocb;
                ha->isp_ops.read_nvram = qla24xx_read_nvram_data;
                ha->isp_ops.write_nvram = qla24xx_write_nvram_data;
                ha->isp_ops.fw_dump = qla24xx_fw_dump;
                ha->isp_ops.ascii_fw_dump = qla24xx_ascii_fw_dump;
                ha->gid_list_info_size = 8;
        }
        host->can_queue = ha->request_q_length + 128;

        /* load the F/W, read paramaters, and init the H/W */
        ha->instance = num_hosts;

        init_MUTEX(&ha->mbx_cmd_sem);
        init_MUTEX_LOCKED(&ha->mbx_intr_sem);

        INIT_LIST_HEAD(&ha->list);
        INIT_LIST_HEAD(&ha->fcports);
        INIT_LIST_HEAD(&ha->rscn_fcports);

        /*
         * These locks are used to prevent more than one CPU
         * from modifying the queue at the same time. The
         * higher level "host_lock" will reduce most
         * contention for these locks.
         */
        spin_lock_init(&ha->mbx_reg_lock);

        ha->dpc_pid = -1;
        init_completion(&ha->dpc_inited);
        init_completion(&ha->dpc_exited);

        qla2x00_config_dma_addressing(ha);
        if (qla2x00_mem_alloc(ha)) {
                qla_printk(KERN_WARNING, ha,
                    "[ERROR] Failed to allocate memory for adapter\n");

                ret = -ENOMEM;
                goto probe_failed;
        }

        if (qla2x00_initialize_adapter(ha) &&
            !(ha->device_flags & DFLG_NO_CABLE)) {

                qla_printk(KERN_WARNING, ha,
                    "Failed to initialize adapter\n");

                DEBUG2(printk("scsi(%ld): Failed to initialize adapter - "
                    "Adapter flags %x.\n",
                    ha->host_no, ha->device_flags));

                ret = -ENODEV;
                goto probe_failed;
        }

        /*
         * Startup the kernel thread for this host adapter
         */
        ha->dpc_should_die = 0;
        ha->dpc_pid = kernel_thread(qla2x00_do_dpc, ha, 0);
        if (ha->dpc_pid < 0) {
                qla_printk(KERN_WARNING, ha,
                    "Unable to start DPC thread!\n");

                ret = -ENODEV;
                goto probe_failed;
        }
        wait_for_completion(&ha->dpc_inited);

        host->this_id = 255;
        host->cmd_per_lun = 3;
        host->unique_id = ha->instance;
        host->max_cmd_len = MAX_CMDSZ;
        host->max_channel = ha->ports - 1;
        host->max_lun = MAX_LUNS;
        host->transportt = qla2xxx_transport_template;

        ret = request_irq(pdev->irq, ha->isp_ops.intr_handler,
            SA_INTERRUPT|SA_SHIRQ, ha->brd_info->drv_name, ha);
        if (ret) {
                qla_printk(KERN_WARNING, ha,
                    "Failed to reserve interrupt %d already in use.\n",
                    pdev->irq);
                goto probe_failed;
        }
        host->irq = pdev->irq;

        /* Initialized the timer */
        qla2x00_start_timer(ha, qla2x00_timer, WATCH_INTERVAL);

        DEBUG2(printk("DEBUG: detect hba %ld at address = %p\n",
            ha->host_no, ha));

        ha->isp_ops.disable_intrs(ha);

        spin_lock_irqsave(&ha->hardware_lock, flags);
        reg = ha->iobase;
        if (IS_QLA24XX(ha) || IS_QLA25XX(ha)) {
                WRT_REG_DWORD(&reg->isp24.hccr, HCCRX_CLR_HOST_INT);
                WRT_REG_DWORD(&reg->isp24.hccr, HCCRX_CLR_RISC_INT);
        } else {
                WRT_REG_WORD(&reg->isp.semaphore, 0);
                WRT_REG_WORD(&reg->isp.hccr, HCCR_CLR_RISC_INT);
                WRT_REG_WORD(&reg->isp.hccr, HCCR_CLR_HOST_INT);

                /* Enable proper parity */
                if (!IS_QLA2100(ha) && !IS_QLA2200(ha)) {
                        if (IS_QLA2300(ha))
                                /* SRAM parity */
                                WRT_REG_WORD(&reg->isp.hccr,
                                    (HCCR_ENABLE_PARITY + 0x1));
                        else
                                /* SRAM, Instruction RAM and GP RAM parity */
                                WRT_REG_WORD(&reg->isp.hccr,
                                    (HCCR_ENABLE_PARITY + 0x7));
                }
        }
        spin_unlock_irqrestore(&ha->hardware_lock, flags);

        ha->isp_ops.enable_intrs(ha);

        /* v2.19.5b6 */
        /*
         * Wait around max loop_reset_delay secs for the devices to come
         * on-line. We don't want Linux scanning before we are ready.
         *
         */
        for (wait_switch = jiffies + (ha->loop_reset_delay * HZ);
            time_before(jiffies,wait_switch) &&
             !(ha->device_flags & (DFLG_NO_CABLE | DFLG_FABRIC_DEVICES))
             && (ha->device_flags & SWITCH_FOUND) ;) {

                qla2x00_check_fabric_devices(ha);

                msleep(10);
        }

        pci_set_drvdata(pdev, ha);
        ha->flags.init_done = 1;
        num_hosts++;

        ret = scsi_add_host(host, &pdev->dev);
        if (ret)
                goto probe_failed;

        qla2x00_alloc_sysfs_attr(ha);

        qla2x00_init_host_attr(ha);

        qla_printk(KERN_INFO, ha, "\n"
            " QLogic Fibre Channel HBA Driver: %s\n"
            "  QLogic %s - %s\n"
            "  %s: %s @ %s hdma%c, host#=%ld, fw=%s\n", qla2x00_version_str,
            ha->model_number, ha->model_desc ? ha->model_desc: "",
            ha->brd_info->isp_name, ha->isp_ops.pci_info_str(ha, pci_info),
            pci_name(pdev), ha->flags.enable_64bit_addressing ? '+': '-',
            ha->host_no, ha->isp_ops.fw_version_str(ha, fw_str));

        /* Go with fc_rport registration. */
        list_for_each_entry(fcport, &ha->fcports, list)
                qla2x00_reg_remote_port(ha, fcport);

        return 0;

probe_failed:
        qla2x00_free_device(ha);

        scsi_host_put(host);

probe_disable_device:
        pci_disable_device(pdev);

probe_out:
        return ret;
}
EXPORT_SYMBOL_GPL(qla2x00_probe_one);

void qla2x00_remove_one(struct pci_dev *pdev)
{
        scsi_qla_host_t *ha;

        ha = pci_get_drvdata(pdev);

        qla2x00_free_sysfs_attr(ha);

        fc_remove_host(ha->host);

        scsi_remove_host(ha->host);

        qla2x00_free_device(ha);

        scsi_host_put(ha->host);

        pci_set_drvdata(pdev, NULL);
}
EXPORT_SYMBOL_GPL(qla2x00_remove_one);

static void
qla2x00_free_device(scsi_qla_host_t *ha)
{
        int ret;

        /* Abort any outstanding IO descriptors. */
        if (!IS_QLA2100(ha) && !IS_QLA2200(ha))
                qla2x00_cancel_io_descriptors(ha);

        /* turn-off interrupts on the card */
        if (ha->interrupts_on)
                ha->isp_ops.disable_intrs(ha);

        /* Disable timer */
        if (ha->timer_active)
                qla2x00_stop_timer(ha);

        /* Kill the kernel thread for this host */
        if (ha->dpc_pid >= 0) {
                ha->dpc_should_die = 1;
                wmb();
                ret = kill_proc(ha->dpc_pid, SIGHUP, 1);
                if (ret) {
                        qla_printk(KERN_ERR, ha,
                            "Unable to signal DPC thread -- (%d)\n", ret);

                        /* TODO: SOMETHING MORE??? */
                } else {
                        wait_for_completion(&ha->dpc_exited);
                }
        }

        qla2x00_mem_free(ha);


        ha->flags.online = 0;

        /* Detach interrupts */
        if (ha->pdev->irq)
                free_irq(ha->pdev->irq, ha);

        /* release io space registers  */
        if (ha->iobase)
                iounmap(ha->iobase);
        pci_release_regions(ha->pdev);

        pci_disable_device(ha->pdev);
}

/*
 * qla2x00_mark_device_lost Updates fcport state when device goes offline.
 *
 * Input: ha = adapter block pointer.  fcport = port structure pointer.
 *
 * Return: None.
 *
 * Context:
 */
void qla2x00_mark_device_lost(scsi_qla_host_t *ha, fc_port_t *fcport,
    int do_login)
{
        if (atomic_read(&fcport->state) == FCS_ONLINE && fcport->rport)
                fc_remote_port_block(fcport->rport);
        /*
         * We may need to retry the login, so don't change the state of the
         * port but do the retries.
         */
        if (atomic_read(&fcport->state) != FCS_DEVICE_DEAD)
                atomic_set(&fcport->state, FCS_DEVICE_LOST);

        if (!do_login)
                return;

        if (fcport->login_retry == 0) {
                fcport->login_retry = ha->login_retry_count;
                set_bit(RELOGIN_NEEDED, &ha->dpc_flags);

                DEBUG(printk("scsi(%ld): Port login retry: "
                    "%02x%02x%02x%02x%02x%02x%02x%02x, "
                    "id = 0x%04x retry cnt=%d\n",
                    ha->host_no,
                    fcport->port_name[0],
                    fcport->port_name[1],
                    fcport->port_name[2],
                    fcport->port_name[3],
                    fcport->port_name[4],
                    fcport->port_name[5],
                    fcport->port_name[6],
                    fcport->port_name[7],
                    fcport->loop_id,
                    fcport->login_retry));
        }
}

/*
 * qla2x00_mark_all_devices_lost
 *      Updates fcport state when device goes offline.
 *
 * Input:
 *      ha = adapter block pointer.
 *      fcport = port structure pointer.
 *
 * Return:
 *      None.
 *
 * Context:
 */
void
qla2x00_mark_all_devices_lost(scsi_qla_host_t *ha)
{
        fc_port_t *fcport;

        list_for_each_entry(fcport, &ha->fcports, list) {
                if (fcport->port_type != FCT_TARGET)
                        continue;

                /*
                 * No point in marking the device as lost, if the device is
                 * already DEAD.
                 */
                if (atomic_read(&fcport->state) == FCS_DEVICE_DEAD)
                        continue;
                if (atomic_read(&fcport->state) == FCS_ONLINE && fcport->rport)
                        fc_remote_port_block(fcport->rport);
                atomic_set(&fcport->state, FCS_DEVICE_LOST);
        }
}

/*
* qla2x00_mem_alloc
*      Allocates adapter memory.
*
* Returns:
*      0  = success.
*      1  = failure.
*/
static uint8_t
qla2x00_mem_alloc(scsi_qla_host_t *ha)
{
        char    name[16];
        uint8_t   status = 1;
        int     retry= 10;

        do {
                /*
                 * This will loop only once if everything goes well, else some
                 * number of retries will be performed to get around a kernel
                 * bug where available mem is not allocated until after a
                 * little delay and a retry.
                 */
                ha->request_ring = dma_alloc_coherent(&ha->pdev->dev,
                    (ha->request_q_length + 1) * sizeof(request_t),
                    &ha->request_dma, GFP_KERNEL);
                if (ha->request_ring == NULL) {
                        qla_printk(KERN_WARNING, ha,
                            "Memory Allocation failed - request_ring\n");

                        qla2x00_mem_free(ha);
                        msleep(100);

                        continue;
                }

                ha->response_ring = dma_alloc_coherent(&ha->pdev->dev,
                    (ha->response_q_length + 1) * sizeof(response_t),
                    &ha->response_dma, GFP_KERNEL);
                if (ha->response_ring == NULL) {
                        qla_printk(KERN_WARNING, ha,
                            "Memory Allocation failed - response_ring\n");

                        qla2x00_mem_free(ha);
                        msleep(100);

                        continue;
                }

                ha->gid_list = dma_alloc_coherent(&ha->pdev->dev, GID_LIST_SIZE,
                    &ha->gid_list_dma, GFP_KERNEL);
                if (ha->gid_list == NULL) {
                        qla_printk(KERN_WARNING, ha,
                            "Memory Allocation failed - gid_list\n");

                        qla2x00_mem_free(ha);
                        msleep(100);

                        continue;
                }

                ha->rlc_rsp = dma_alloc_coherent(&ha->pdev->dev,
                    sizeof(rpt_lun_cmd_rsp_t), &ha->rlc_rsp_dma, GFP_KERNEL);
                if (ha->rlc_rsp == NULL) {
                        qla_printk(KERN_WARNING, ha,
                                "Memory Allocation failed - rlc");

                        qla2x00_mem_free(ha);
                        msleep(100);

                        continue;
                }

                snprintf(name, sizeof(name), "qla2xxx_%ld", ha->host_no);
                ha->s_dma_pool = dma_pool_create(name, &ha->pdev->dev,
                    DMA_POOL_SIZE, 8, 0);
                if (ha->s_dma_pool == NULL) {
                        qla_printk(KERN_WARNING, ha,
                            "Memory Allocation failed - s_dma_pool\n");

                        qla2x00_mem_free(ha);
                        msleep(100);

                        continue;
                }

                /* get consistent memory allocated for init control block */
                ha->init_cb = dma_pool_alloc(ha->s_dma_pool, GFP_KERNEL,
                    &ha->init_cb_dma);
                if (ha->init_cb == NULL) {
                        qla_printk(KERN_WARNING, ha,
                            "Memory Allocation failed - init_cb\n");

                        qla2x00_mem_free(ha);
                        msleep(100);

                        continue;
                }
                memset(ha->init_cb, 0, ha->init_cb_size);

                /* Get consistent memory allocated for Get Port Database cmd */
                ha->iodesc_pd = dma_pool_alloc(ha->s_dma_pool, GFP_KERNEL,
                    &ha->iodesc_pd_dma);
                if (ha->iodesc_pd == NULL) {
                        /* error */
                        qla_printk(KERN_WARNING, ha,
                            "Memory Allocation failed - iodesc_pd\n");

                        qla2x00_mem_free(ha);
                        msleep(100);

                        continue;
                }
                memset(ha->iodesc_pd, 0, PORT_DATABASE_SIZE);

                /* Allocate ioctl related memory. */
                if (qla2x00_alloc_ioctl_mem(ha)) {
                        qla_printk(KERN_WARNING, ha,
                            "Memory Allocation failed - ioctl_mem\n");

                        qla2x00_mem_free(ha);
                        msleep(100);

                        continue;
                }

                if (qla2x00_allocate_sp_pool(ha)) {
                        qla_printk(KERN_WARNING, ha,
                            "Memory Allocation failed - "
                            "qla2x00_allocate_sp_pool()\n");

                        qla2x00_mem_free(ha);
                        msleep(100);

                        continue;
                }

                /* Allocate memory for SNS commands */
                if (IS_QLA2100(ha) || IS_QLA2200(ha)) {
                        /* Get consistent memory allocated for SNS commands */
                        ha->sns_cmd = dma_alloc_coherent(&ha->pdev->dev,
                            sizeof(struct sns_cmd_pkt), &ha->sns_cmd_dma,
                            GFP_KERNEL);
                        if (ha->sns_cmd == NULL) {
                                /* error */
                                qla_printk(KERN_WARNING, ha,
                                    "Memory Allocation failed - sns_cmd\n");

                                qla2x00_mem_free(ha);
                                msleep(100);

                                continue;
                        }
                        memset(ha->sns_cmd, 0, sizeof(struct sns_cmd_pkt));
                } else {
                        /* Get consistent memory allocated for MS IOCB */
                        ha->ms_iocb = dma_pool_alloc(ha->s_dma_pool, GFP_KERNEL,
                            &ha->ms_iocb_dma);
                        if (ha->ms_iocb == NULL) {
                                /* error */
                                qla_printk(KERN_WARNING, ha,
                                    "Memory Allocation failed - ms_iocb\n");

                                qla2x00_mem_free(ha);
                                msleep(100);

                                continue;
                        }
                        memset(ha->ms_iocb, 0, sizeof(ms_iocb_entry_t));

                        /*
                         * Get consistent memory allocated for CT SNS
                         * commands
                         */
                        ha->ct_sns = dma_alloc_coherent(&ha->pdev->dev,
                            sizeof(struct ct_sns_pkt), &ha->ct_sns_dma,
                            GFP_KERNEL);
                        if (ha->ct_sns == NULL) {
                                /* error */
                                qla_printk(KERN_WARNING, ha,
                                    "Memory Allocation failed - ct_sns\n");

                                qla2x00_mem_free(ha);
                                msleep(100);

                                continue;
                        }
                        memset(ha->ct_sns, 0, sizeof(struct ct_sns_pkt));
                }

                /* Done all allocations without any error. */
                status = 0;

        } while (retry-- && status != 0);

        if (status) {
                printk(KERN_WARNING
                        "%s(): **** FAILED ****\n", __func__);
        }

        return(status);
}

/*
* qla2x00_mem_free
*      Frees all adapter allocated memory.
*
* Input:
*      ha = adapter block pointer.
*/
static void
qla2x00_mem_free(scsi_qla_host_t *ha)
{
        struct list_head        *fcpl, *fcptemp;
        fc_port_t       *fcport;
        unsigned long   wtime;/* max wait time if mbx cmd is busy. */

        if (ha == NULL) {
                /* error */
                DEBUG2(printk("%s(): ERROR invalid ha pointer.\n", __func__));
                return;
        }

        /* Make sure all other threads are stopped. */
        wtime = 60 * HZ;
        while (ha->dpc_wait && wtime) {
                set_current_state(TASK_INTERRUPTIBLE);
                wtime = schedule_timeout(wtime);
        }

        /* free ioctl memory */
        qla2x00_free_ioctl_mem(ha);

        /* free sp pool */
        qla2x00_free_sp_pool(ha);

        if (ha->sns_cmd)
                dma_free_coherent(&ha->pdev->dev, sizeof(struct sns_cmd_pkt),
                    ha->sns_cmd, ha->sns_cmd_dma);

        if (ha->ct_sns)
                dma_free_coherent(&ha->pdev->dev, sizeof(struct ct_sns_pkt),
                    ha->ct_sns, ha->ct_sns_dma);

        if (ha->ms_iocb)
                dma_pool_free(ha->s_dma_pool, ha->ms_iocb, ha->ms_iocb_dma);

        if (ha->iodesc_pd)
                dma_pool_free(ha->s_dma_pool, ha->iodesc_pd, ha->iodesc_pd_dma);

        if (ha->init_cb)
                dma_pool_free(ha->s_dma_pool, ha->init_cb, ha->init_cb_dma);

        if (ha->s_dma_pool)
                dma_pool_destroy(ha->s_dma_pool);

        if (ha->rlc_rsp)
                dma_free_coherent(&ha->pdev->dev,
                    sizeof(rpt_lun_cmd_rsp_t), ha->rlc_rsp,
                    ha->rlc_rsp_dma);

        if (ha->gid_list)
                dma_free_coherent(&ha->pdev->dev, GID_LIST_SIZE, ha->gid_list,
                    ha->gid_list_dma);

        if (ha->response_ring)
                dma_free_coherent(&ha->pdev->dev,
                    (ha->response_q_length + 1) * sizeof(response_t),
                    ha->response_ring, ha->response_dma);

        if (ha->request_ring)
                dma_free_coherent(&ha->pdev->dev,
                    (ha->request_q_length + 1) * sizeof(request_t),
                    ha->request_ring, ha->request_dma);

        ha->sns_cmd = NULL;
        ha->sns_cmd_dma = 0;
        ha->ct_sns = NULL;
        ha->ct_sns_dma = 0;
        ha->ms_iocb = NULL;
        ha->ms_iocb_dma = 0;
        ha->iodesc_pd = NULL;
        ha->iodesc_pd_dma = 0;
        ha->init_cb = NULL;
        ha->init_cb_dma = 0;

        ha->s_dma_pool = NULL;

        ha->rlc_rsp = NULL;
        ha->rlc_rsp_dma = 0;
        ha->gid_list = NULL;
        ha->gid_list_dma = 0;

        ha->response_ring = NULL;
        ha->response_dma = 0;
        ha->request_ring = NULL;
        ha->request_dma = 0;

        list_for_each_safe(fcpl, fcptemp, &ha->fcports) {
                fcport = list_entry(fcpl, fc_port_t, list);

                /* fc ports */
                list_del_init(&fcport->list);
                kfree(fcport);
        }
        INIT_LIST_HEAD(&ha->fcports);

        if (ha->fw_dump)
                free_pages((unsigned long)ha->fw_dump, ha->fw_dump_order);

        vfree(ha->fw_dump24);

        vfree(ha->fw_dump_buffer);

        ha->fw_dump = NULL;
        ha->fw_dump24 = NULL;
        ha->fw_dumped = 0;
        ha->fw_dump_reading = 0;
        ha->fw_dump_buffer = NULL;
}

/*
 * qla2x00_allocate_sp_pool
 *       This routine is called during initialization to allocate
 *       memory for local srb_t.
 *
 * Input:
 *       ha   = adapter block pointer.
 *
 * Context:
 *      Kernel context.
 *
 * Note: Sets the ref_count for non Null sp to one.
 */
static int
qla2x00_allocate_sp_pool(scsi_qla_host_t *ha)
{
        int      rval;

        rval = QLA_SUCCESS;
        ha->srb_mempool = mempool_create(SRB_MIN_REQ, mempool_alloc_slab,
            mempool_free_slab, srb_cachep);
        if (ha->srb_mempool == NULL) {
                qla_printk(KERN_INFO, ha, "Unable to allocate SRB mempool.\n");
                rval = QLA_FUNCTION_FAILED;
        }
        return (rval);
}

/*
 *  This routine frees all adapter allocated memory.
 *
 */
static void
qla2x00_free_sp_pool( scsi_qla_host_t *ha)
{
        if (ha->srb_mempool) {
                mempool_destroy(ha->srb_mempool);
                ha->srb_mempool = NULL;
        }
}

/**************************************************************************
* qla2x00_do_dpc
*   This kernel thread is a task that is schedule by the interrupt handler
*   to perform the background processing for interrupts.
*
* Notes:
* This task always run in the context of a kernel thread.  It
* is kick-off by the driver's detect code and starts up
* up one per adapter. It immediately goes to sleep and waits for
* some fibre event.  When either the interrupt handler or
* the timer routine detects a event it will one of the task
* bits then wake us up.
**************************************************************************/
static int
qla2x00_do_dpc(void *data)
{
        DECLARE_MUTEX_LOCKED(sem);
        scsi_qla_host_t *ha;
        fc_port_t       *fcport;
        uint8_t         status;
        uint16_t        next_loopid;

        ha = (scsi_qla_host_t *)data;

        lock_kernel();

        daemonize("%s_dpc", ha->host_str);
        allow_signal(SIGHUP);

        ha->dpc_wait = &sem;

        set_user_nice(current, -20);

        unlock_kernel();

        complete(&ha->dpc_inited);

        while (1) {
                DEBUG3(printk("qla2x00: DPC handler sleeping\n"));

                if (down_interruptible(&sem))
                        break;

                if (ha->dpc_should_die)
                        break;

                DEBUG3(printk("qla2x00: DPC handler waking up\n"));

                /* Initialization not yet finished. Don't do anything yet. */
                if (!ha->flags.init_done || ha->dpc_active)
                        continue;

                DEBUG3(printk("scsi(%ld): DPC handler\n", ha->host_no));

                ha->dpc_active = 1;

                if (ha->flags.mbox_busy) {
                        ha->dpc_active = 0;
                        continue;
                }

                if (test_and_clear_bit(ISP_ABORT_NEEDED, &ha->dpc_flags)) {

                        DEBUG(printk("scsi(%ld): dpc: sched "
                            "qla2x00_abort_isp ha = %p\n",
                            ha->host_no, ha));
                        if (!(test_and_set_bit(ABORT_ISP_ACTIVE,
                            &ha->dpc_flags))) {

                                if (qla2x00_abort_isp(ha)) {
                                        /* failed. retry later */
                                        set_bit(ISP_ABORT_NEEDED,
                                            &ha->dpc_flags);
                                }
                                clear_bit(ABORT_ISP_ACTIVE, &ha->dpc_flags);
                        }
                        DEBUG(printk("scsi(%ld): dpc: qla2x00_abort_isp end\n",
                            ha->host_no));
                }

                if (test_and_clear_bit(RESET_MARKER_NEEDED, &ha->dpc_flags) &&
                    (!(test_and_set_bit(RESET_ACTIVE, &ha->dpc_flags)))) {

                        DEBUG(printk("scsi(%ld): qla2x00_reset_marker()\n",
                            ha->host_no));

                        qla2x00_rst_aen(ha);
                        clear_bit(RESET_ACTIVE, &ha->dpc_flags);
                }

                /* Retry each device up to login retry count */
                if ((test_and_clear_bit(RELOGIN_NEEDED, &ha->dpc_flags)) &&
                    !test_bit(LOOP_RESYNC_NEEDED, &ha->dpc_flags) &&
                    atomic_read(&ha->loop_state) != LOOP_DOWN) {

                        DEBUG(printk("scsi(%ld): qla2x00_port_login()\n",
                            ha->host_no));

                        next_loopid = 0;
                        list_for_each_entry(fcport, &ha->fcports, list) {
                                if (fcport->port_type != FCT_TARGET)
                                        continue;

                                /*
                                 * If the port is not ONLINE then try to login
                                 * to it if we haven't run out of retries.
                                 */
                                if (atomic_read(&fcport->state) != FCS_ONLINE &&
                                    fcport->login_retry) {

                                        fcport->login_retry--;
                                        if (fcport->flags & FCF_FABRIC_DEVICE) {
                                                if (fcport->flags &
                                                    FCF_TAPE_PRESENT)
                                                        ha->isp_ops.fabric_logout(
                                                            ha, fcport->loop_id,
                                                            fcport->d_id.b.domain,
                                                            fcport->d_id.b.area,
                                                            fcport->d_id.b.al_pa);
                                                status = qla2x00_fabric_login(
                                                    ha, fcport, &next_loopid);
                                        } else
                                                status =
                                                    qla2x00_local_device_login(
                                                        ha, fcport->loop_id);

                                        if (status == QLA_SUCCESS) {
                                                fcport->old_loop_id = fcport->loop_id;

                                                DEBUG(printk("scsi(%ld): port login OK: logged in ID 0x%x\n",
                                                    ha->host_no, fcport->loop_id));

                                                fcport->port_login_retry_count =
                                                    ha->port_down_retry_count * PORT_RETRY_TIME;
                                                atomic_set(&fcport->state, FCS_ONLINE);
                                                atomic_set(&fcport->port_down_timer,
                                                    ha->port_down_retry_count * PORT_RETRY_TIME);

                                                fcport->login_retry = 0;
                                        } else if (status == 1) {
                                                set_bit(RELOGIN_NEEDED, &ha->dpc_flags);
                                                /* retry the login again */
                                                DEBUG(printk("scsi(%ld): Retrying %d login again loop_id 0x%x\n",
                                                    ha->host_no,
                                                    fcport->login_retry, fcport->loop_id));
                                        } else {
                                                fcport->login_retry = 0;
                                        }
                                }
                                if (test_bit(LOOP_RESYNC_NEEDED, &ha->dpc_flags))
                                        break;
                        }
                        DEBUG(printk("scsi(%ld): qla2x00_port_login - end\n",
                            ha->host_no));
                }

                if ((test_bit(LOGIN_RETRY_NEEDED, &ha->dpc_flags)) &&
                    atomic_read(&ha->loop_state) != LOOP_DOWN) {

                        clear_bit(LOGIN_RETRY_NEEDED, &ha->dpc_flags);
                        DEBUG(printk("scsi(%ld): qla2x00_login_retry()\n",
                            ha->host_no));

                        set_bit(LOOP_RESYNC_NEEDED, &ha->dpc_flags);

                        DEBUG(printk("scsi(%ld): qla2x00_login_retry - end\n",
                            ha->host_no));
                }

                if (test_and_clear_bit(LOOP_RESYNC_NEEDED, &ha->dpc_flags)) {

                        DEBUG(printk("scsi(%ld): qla2x00_loop_resync()\n",
                            ha->host_no));

                        if (!(test_and_set_bit(LOOP_RESYNC_ACTIVE,
                            &ha->dpc_flags))) {

                                qla2x00_loop_resync(ha);

                                clear_bit(LOOP_RESYNC_ACTIVE, &ha->dpc_flags);
                        }

                        DEBUG(printk("scsi(%ld): qla2x00_loop_resync - end\n",
                            ha->host_no));
                }

                if (test_and_clear_bit(FCPORT_RESCAN_NEEDED, &ha->dpc_flags)) {

                        DEBUG(printk("scsi(%ld): Rescan flagged fcports...\n",
                            ha->host_no));

                        qla2x00_rescan_fcports(ha);

                        DEBUG(printk("scsi(%ld): Rescan flagged fcports..."
                            "end.\n",
                            ha->host_no));
                }

                if (!ha->interrupts_on)
                        ha->isp_ops.enable_intrs(ha);

                ha->dpc_active = 0;
        } /* End of while(1) */

        DEBUG(printk("scsi(%ld): DPC handler exiting\n", ha->host_no));

        /*
         * Make sure that nobody tries to wake us up again.
         */
        ha->dpc_wait = NULL;
        ha->dpc_active = 0;

        complete_and_exit(&ha->dpc_exited, 0);
}

/*
*  qla2x00_rst_aen
*      Processes asynchronous reset.
*
* Input:
*      ha  = adapter block pointer.
*/
static void
qla2x00_rst_aen(scsi_qla_host_t *ha)
{
        if (ha->flags.online && !ha->flags.reset_active &&
            !atomic_read(&ha->loop_down_timer) &&
            !(test_bit(ABORT_ISP_ACTIVE, &ha->dpc_flags))) {
                do {
                        clear_bit(RESET_MARKER_NEEDED, &ha->dpc_flags);

                        /*
                         * Issue marker command only when we are going to start
                         * the I/O.
                         */
                        ha->marker_needed = 1;
                } while (!atomic_read(&ha->loop_down_timer) &&
                    (test_bit(RESET_MARKER_NEEDED, &ha->dpc_flags)));
        }
}

static void
qla2x00_sp_free_dma(scsi_qla_host_t *ha, srb_t *sp)
{
        struct scsi_cmnd *cmd = sp->cmd;

        if (sp->flags & SRB_DMA_VALID) {
                if (cmd->use_sg) {
                        dma_unmap_sg(&ha->pdev->dev, cmd->request_buffer,
                            cmd->use_sg, cmd->sc_data_direction);
                } else if (cmd->request_bufflen) {
                        dma_unmap_single(&ha->pdev->dev, sp->dma_handle,
                            cmd->request_bufflen, cmd->sc_data_direction);
                }
                sp->flags &= ~SRB_DMA_VALID;
        }
        CMD_SP(cmd) = NULL;
}

void
qla2x00_sp_compl(scsi_qla_host_t *ha, srb_t *sp)
{
        struct scsi_cmnd *cmd = sp->cmd;

        qla2x00_sp_free_dma(ha, sp);

        mempool_free(sp, ha->srb_mempool);

        cmd->scsi_done(cmd);
}

/**************************************************************************
*   qla2x00_timer
*
* Description:
*   One second timer
*
* Context: Interrupt
***************************************************************************/
static void
qla2x00_timer(scsi_qla_host_t *ha)
{
        unsigned long   cpu_flags = 0;
        fc_port_t       *fcport;
        int             start_dpc = 0;
        int             index;
        srb_t           *sp;
        int             t;

        /*
         * Ports - Port down timer.
         *
         * Whenever, a port is in the LOST state we start decrementing its port
         * down timer every second until it reaches zero. Once  it reaches zero
         * the port it marked DEAD.
         */
        t = 0;
        list_for_each_entry(fcport, &ha->fcports, list) {
                if (fcport->port_type != FCT_TARGET)
                        continue;

                if (atomic_read(&fcport->state) == FCS_DEVICE_LOST) {

                        if (atomic_read(&fcport->port_down_timer) == 0)
                                continue;

                        if (atomic_dec_and_test(&fcport->port_down_timer) != 0)
                                atomic_set(&fcport->state, FCS_DEVICE_DEAD);

                        DEBUG(printk("scsi(%ld): fcport-%d - port retry count: "
                            "%d remaining\n",
                            ha->host_no,
                            t, atomic_read(&fcport->port_down_timer)));
                }
                t++;
        } /* End of for fcport  */


        /* Loop down handler. */
        if (atomic_read(&ha->loop_down_timer) > 0 &&
            !(test_bit(ABORT_ISP_ACTIVE, &ha->dpc_flags)) && ha->flags.online) {

                if (atomic_read(&ha->loop_down_timer) ==
                    ha->loop_down_abort_time) {

                        DEBUG(printk("scsi(%ld): Loop Down - aborting the "
                            "queues before time expire\n",
                            ha->host_no));

                        if (!IS_QLA2100(ha) && ha->link_down_timeout)
                                atomic_set(&ha->loop_state, LOOP_DEAD);

                        /* Schedule an ISP abort to return any tape commands. */
                        spin_lock_irqsave(&ha->hardware_lock, cpu_flags);
                        for (index = 1; index < MAX_OUTSTANDING_COMMANDS;
                            index++) {
                                fc_port_t *sfcp;

                                sp = ha->outstanding_cmds[index];
                                if (!sp)
                                        continue;
                                sfcp = sp->fcport;
                                if (!(sfcp->flags & FCF_TAPE_PRESENT))
                                        continue;

                                set_bit(ISP_ABORT_NEEDED, &ha->dpc_flags);
                                break;
                        }
                        spin_unlock_irqrestore(&ha->hardware_lock, cpu_flags);

                        set_bit(ABORT_QUEUES_NEEDED, &ha->dpc_flags);
                        start_dpc++;
                }

                /* if the loop has been down for 4 minutes, reinit adapter */
                if (atomic_dec_and_test(&ha->loop_down_timer) != 0) {
                        DEBUG(printk("scsi(%ld): Loop down exceed 4 mins - "
                            "restarting queues.\n",
                            ha->host_no));

                        set_bit(RESTART_QUEUES_NEEDED, &ha->dpc_flags);
                        start_dpc++;

                        if (!(ha->device_flags & DFLG_NO_CABLE)) {
                                DEBUG(printk("scsi(%ld): Loop down - "
                                    "aborting ISP.\n",
                                    ha->host_no));
                                qla_printk(KERN_WARNING, ha,
                                    "Loop down - aborting ISP.\n");

                                set_bit(ISP_ABORT_NEEDED, &ha->dpc_flags);
                        }
                }
                DEBUG3(printk("scsi(%ld): Loop Down - seconds remaining %d\n",
                    ha->host_no,
                    atomic_read(&ha->loop_down_timer)));
        }

        /* Schedule the DPC routine if needed */
        if ((test_bit(ISP_ABORT_NEEDED, &ha->dpc_flags) ||
            test_bit(LOOP_RESYNC_NEEDED, &ha->dpc_flags) ||
            start_dpc ||
            test_bit(LOGIN_RETRY_NEEDED, &ha->dpc_flags) ||
            test_bit(RESET_MARKER_NEEDED, &ha->dpc_flags) ||
            test_bit(RELOGIN_NEEDED, &ha->dpc_flags)) &&
            ha->dpc_wait && !ha->dpc_active) {

                up(ha->dpc_wait);
        }

        qla2x00_restart_timer(ha, WATCH_INTERVAL);
}

/* XXX(hch): crude hack to emulate a down_timeout() */
int
qla2x00_down_timeout(struct semaphore *sema, unsigned long timeout)
{
        const unsigned int step = HZ/10;

        do {
                if (!down_trylock(sema))
                        return 0;
                set_current_state(TASK_INTERRUPTIBLE);
                if (schedule_timeout(step))
                        break;
        } while ((timeout -= step) > 0);

        return -ETIMEDOUT;
}

static struct qla_board_info qla_board_tbl[] = {
        {
                .drv_name       = "qla2400",
                .isp_name       = "ISP2422",
                .fw_fname       = "ql2400_fw.bin",
                .sht            = &qla24xx_driver_template,
        },
        {
                .drv_name       = "qla2400",
                .isp_name       = "ISP2432",
                .fw_fname       = "ql2400_fw.bin",
                .sht            = &qla24xx_driver_template,
        },
};

static struct pci_device_id qla2xxx_pci_tbl[] = {
        {
                .vendor         = PCI_VENDOR_ID_QLOGIC,
                .device         = PCI_DEVICE_ID_QLOGIC_ISP2422,
                .subvendor      = PCI_ANY_ID,
                .subdevice      = PCI_ANY_ID,
                .driver_data    = (unsigned long)&qla_board_tbl[0],
        },
        {
                .vendor         = PCI_VENDOR_ID_QLOGIC,
                .device         = PCI_DEVICE_ID_QLOGIC_ISP2432,
                .subvendor      = PCI_ANY_ID,
                .subdevice      = PCI_ANY_ID,
                .driver_data    = (unsigned long)&qla_board_tbl[1],
        },
        {0, 0},
};
MODULE_DEVICE_TABLE(pci, qla2xxx_pci_tbl);

static int __devinit
qla2xxx_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
{
        return qla2x00_probe_one(pdev,
            (struct qla_board_info *)id->driver_data);
}

static void __devexit
qla2xxx_remove_one(struct pci_dev *pdev)
{
        qla2x00_remove_one(pdev);
}

static struct pci_driver qla2xxx_pci_driver = {
        .name           = "qla2xxx",
        .id_table       = qla2xxx_pci_tbl,
        .probe          = qla2xxx_probe_one,
        .remove         = __devexit_p(qla2xxx_remove_one),
};

/**
 * qla2x00_module_init - Module initialization.
 **/
static int __init
qla2x00_module_init(void)
{
        int ret = 0;

        /* Allocate cache for SRBs. */
        srb_cachep = kmem_cache_create("qla2xxx_srbs", sizeof(srb_t), 0,
            SLAB_HWCACHE_ALIGN, NULL, NULL);
        if (srb_cachep == NULL) {
                printk(KERN_ERR
                    "qla2xxx: Unable to allocate SRB cache...Failing load!\n");
                return -ENOMEM;
        }

        /* Derive version string. */
        strcpy(qla2x00_version_str, QLA2XXX_VERSION);
#if DEBUG_QLA2100
        strcat(qla2x00_version_str, "-debug");
#endif
        qla2xxx_transport_template =
            fc_attach_transport(&qla2xxx_transport_functions);
        if (!qla2xxx_transport_template)
                return -ENODEV;

        printk(KERN_INFO "QLogic Fibre Channel HBA Driver\n");
        ret = pci_module_init(&qla2xxx_pci_driver);
        if (ret) {
                kmem_cache_destroy(srb_cachep);
                fc_release_transport(qla2xxx_transport_template);
        }
        return ret;
}

/**
 * qla2x00_module_exit - Module cleanup.
 **/
static void __exit
qla2x00_module_exit(void)
{
        pci_unregister_driver(&qla2xxx_pci_driver);
        kmem_cache_destroy(srb_cachep);
        fc_release_transport(qla2xxx_transport_template);
}

module_init(qla2x00_module_init);
module_exit(qla2x00_module_exit);

MODULE_AUTHOR("QLogic Corporation");
MODULE_DESCRIPTION("QLogic Fibre Channel HBA Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(QLA2XXX_VERSION);