pmcraid.c

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/*
 * pmcraid.c -- driver for PMC Sierra MaxRAID controller adapters
 *
 * Written By: Anil Ravindranath<[email protected]>
 *             PMC-Sierra Inc
 *
 * Copyright (C) 2008, 2009 PMC Sierra Inc
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  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., 59 Temple Place, Suite 330, Boston, MA 02111-1307,
 * USA
 *
 */
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/wait.h>
#include <linux/spinlock.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/blkdev.h>
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/hdreg.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <asm/irq.h>
#include <asm/processor.h>
#include <linux/libata.h>
#include <linux/mutex.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsicam.h>

#include "pmcraid.h"

/*
 *   Module configuration parameters
 */
static unsigned int pmcraid_debug_log;
static unsigned int pmcraid_disable_aen;
static unsigned int pmcraid_log_level = IOASC_LOG_LEVEL_MUST;
static unsigned int pmcraid_enable_msix;

/*
 * Data structures to support multiple adapters by the LLD.
 * pmcraid_adapter_count - count of configured adapters
 */
static atomic_t pmcraid_adapter_count = ATOMIC_INIT(0);

/*
 * Supporting user-level control interface through IOCTL commands.
 * pmcraid_major - major number to use
 * pmcraid_minor - minor number(s) to use
 */
static unsigned int pmcraid_major;
static struct class *pmcraid_class;
DECLARE_BITMAP(pmcraid_minor, PMCRAID_MAX_ADAPTERS);

/*
 * Module parameters
 */
MODULE_AUTHOR("Anil Ravindranath<[email protected]>");
MODULE_DESCRIPTION("PMC Sierra MaxRAID Controller Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(PMCRAID_DRIVER_VERSION);

module_param_named(log_level, pmcraid_log_level, uint, (S_IRUGO | S_IWUSR));
MODULE_PARM_DESC(log_level,
         "Enables firmware error code logging, default :1 high-severity"
         " errors, 2: all errors including high-severity errors,"
         " 0: disables logging");

module_param_named(debug, pmcraid_debug_log, uint, (S_IRUGO | S_IWUSR));
MODULE_PARM_DESC(debug,
         "Enable driver verbose message logging. Set 1 to enable."
         "(default: 0)");

module_param_named(disable_aen, pmcraid_disable_aen, uint, (S_IRUGO | S_IWUSR));
MODULE_PARM_DESC(disable_aen,
         "Disable driver aen notifications to apps. Set 1 to disable."
         "(default: 0)");

/* chip specific constants for PMC MaxRAID controllers (same for
 * 0x5220 and 0x8010
 */
static struct pmcraid_chip_details pmcraid_chip_cfg[] = {
    {
     .ioastatus = 0x0,
     .ioarrin = 0x00040,
     .mailbox = 0x7FC30,
     .global_intr_mask = 0x00034,
     .ioa_host_intr = 0x0009C,
     .ioa_host_intr_clr = 0x000A0,
     .ioa_host_msix_intr = 0x7FC40,
     .ioa_host_mask = 0x7FC28,
     .ioa_host_mask_clr = 0x7FC28,
     .host_ioa_intr = 0x00020,
     .host_ioa_intr_clr = 0x00020,
     .transop_timeout = 300
     }
};

/*
 * PCI device ids supported by pmcraid driver
 */
static struct pci_device_id pmcraid_pci_table[] __devinitdata = {
    { PCI_DEVICE(PCI_VENDOR_ID_PMC, PCI_DEVICE_ID_PMC_MAXRAID),
      0, 0, (kernel_ulong_t)&pmcraid_chip_cfg[0]
    },
    {}
};

MODULE_DEVICE_TABLE(pci, pmcraid_pci_table);



static int pmcraid_slave_alloc(struct scsi_device *scsi_dev)
{
    struct pmcraid_resource_entry *temp, *res = NULL;
    struct pmcraid_instance *pinstance;
    u8 target, bus, lun;
    unsigned long lock_flags;
    int rc = -ENXIO;
    u16 fw_version;

    pinstance = shost_priv(scsi_dev->host);

    fw_version = be16_to_cpu(pinstance->inq_data->fw_version);

    /* Driver exposes VSET and GSCSI resources only; all other device types
     * are not exposed. Resource list is synchronized using resource lock
     * so any traversal or modifications to the list should be done inside
     * this lock
     */
    spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
    list_for_each_entry(temp, &pinstance->used_res_q, queue) {

        /* do not expose VSETs with order-ids > MAX_VSET_TARGETS */
        if (RES_IS_VSET(temp->cfg_entry)) {
            if (fw_version <= PMCRAID_FW_VERSION_1)
                target = temp->cfg_entry.unique_flags1;
            else
                target = temp->cfg_entry.array_id & 0xFF;

            if (target > PMCRAID_MAX_VSET_TARGETS)
                continue;
            bus = PMCRAID_VSET_BUS_ID;
            lun = 0;
        } else if (RES_IS_GSCSI(temp->cfg_entry)) {
            target = RES_TARGET(temp->cfg_entry.resource_address);
            bus = PMCRAID_PHYS_BUS_ID;
            lun = RES_LUN(temp->cfg_entry.resource_address);
        } else {
            continue;
        }

        if (bus == scsi_dev->channel &&
            target == scsi_dev->id &&
            lun == scsi_dev->lun) {
            res = temp;
            break;
        }
    }

    if (res) {
        res->scsi_dev = scsi_dev;
        scsi_dev->hostdata = res;
        res->change_detected = 0;
        atomic_set(&res->read_failures, 0);
        atomic_set(&res->write_failures, 0);
        rc = 0;
    }
    spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
    return rc;
}

static int pmcraid_slave_configure(struct scsi_device *scsi_dev)
{
    struct pmcraid_resource_entry *res = scsi_dev->hostdata;

    if (!res)
        return 0;

    /* LLD exposes VSETs and Enclosure devices only */
    if (RES_IS_GSCSI(res->cfg_entry) &&
        scsi_dev->type != TYPE_ENCLOSURE)
        return -ENXIO;

    pmcraid_info("configuring %x:%x:%x:%x\n",
             scsi_dev->host->unique_id,
             scsi_dev->channel,
             scsi_dev->id,
             scsi_dev->lun);

    if (RES_IS_GSCSI(res->cfg_entry)) {
        scsi_dev->allow_restart = 1;
    } else if (RES_IS_VSET(res->cfg_entry)) {
        scsi_dev->allow_restart = 1;
        blk_queue_rq_timeout(scsi_dev->request_queue,
                     PMCRAID_VSET_IO_TIMEOUT);
        blk_queue_max_hw_sectors(scsi_dev->request_queue,
                      PMCRAID_VSET_MAX_SECTORS);
    }

    if (scsi_dev->tagged_supported &&
        (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry))) {
        scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
        scsi_adjust_queue_depth(scsi_dev, MSG_SIMPLE_TAG,
                    scsi_dev->host->cmd_per_lun);
    } else {
        scsi_adjust_queue_depth(scsi_dev, 0,
                    scsi_dev->host->cmd_per_lun);
    }

    return 0;
}

static void pmcraid_slave_destroy(struct scsi_device *scsi_dev)
{
    struct pmcraid_resource_entry *res;

    res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;

    if (res)
        res->scsi_dev = NULL;

    scsi_dev->hostdata = NULL;
}

static int pmcraid_change_queue_depth(struct scsi_device *scsi_dev, int depth,
                      int reason)
{
    if (reason != SCSI_QDEPTH_DEFAULT)
        return -EOPNOTSUPP;

    if (depth > PMCRAID_MAX_CMD_PER_LUN)
        depth = PMCRAID_MAX_CMD_PER_LUN;

    scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev), depth);

    return scsi_dev->queue_depth;
}

static int pmcraid_change_queue_type(struct scsi_device *scsi_dev, int tag)
{
    struct pmcraid_resource_entry *res;

    res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;

    if ((res) && scsi_dev->tagged_supported &&
        (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry))) {
        scsi_set_tag_type(scsi_dev, tag);

        if (tag)
            scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
        else
            scsi_deactivate_tcq(scsi_dev, scsi_dev->queue_depth);
    } else
        tag = 0;

    return tag;
}


void pmcraid_init_cmdblk(struct pmcraid_cmd *cmd, int index)
{
    struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
    dma_addr_t dma_addr = cmd->ioa_cb_bus_addr;

    if (index >= 0) {
        /* first time initialization (called from  probe) */
        u32 ioasa_offset =
            offsetof(struct pmcraid_control_block, ioasa);

        cmd->index = index;
        ioarcb->response_handle = cpu_to_le32(index << 2);
        ioarcb->ioarcb_bus_addr = cpu_to_le64(dma_addr);
        ioarcb->ioasa_bus_addr = cpu_to_le64(dma_addr + ioasa_offset);
        ioarcb->ioasa_len = cpu_to_le16(sizeof(struct pmcraid_ioasa));
    } else {
        /* re-initialization of various lengths, called once command is
         * processed by IOA
         */
        memset(&cmd->ioa_cb->ioarcb.cdb, 0, PMCRAID_MAX_CDB_LEN);
        ioarcb->hrrq_id = 0;
        ioarcb->request_flags0 = 0;
        ioarcb->request_flags1 = 0;
        ioarcb->cmd_timeout = 0;
        ioarcb->ioarcb_bus_addr &= (~0x1FULL);
        ioarcb->ioadl_bus_addr = 0;
        ioarcb->ioadl_length = 0;
        ioarcb->data_transfer_length = 0;
        ioarcb->add_cmd_param_length = 0;
        ioarcb->add_cmd_param_offset = 0;
        cmd->ioa_cb->ioasa.ioasc = 0;
        cmd->ioa_cb->ioasa.residual_data_length = 0;
        cmd->time_left = 0;
    }

    cmd->cmd_done = NULL;
    cmd->scsi_cmd = NULL;
    cmd->release = 0;
    cmd->completion_req = 0;
    cmd->sense_buffer = 0;
    cmd->sense_buffer_dma = 0;
    cmd->dma_handle = 0;
    init_timer(&cmd->timer);
}

static void pmcraid_reinit_cmdblk(struct pmcraid_cmd *cmd)
{
    pmcraid_init_cmdblk(cmd, -1);
}

static struct pmcraid_cmd *pmcraid_get_free_cmd(
    struct pmcraid_instance *pinstance
)
{
    struct pmcraid_cmd *cmd = NULL;
    unsigned long lock_flags;

    /* free cmd block list is protected by free_pool_lock */
    spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);

    if (!list_empty(&pinstance->free_cmd_pool)) {
        cmd = list_entry(pinstance->free_cmd_pool.next,
                 struct pmcraid_cmd, free_list);
        list_del(&cmd->free_list);
    }
    spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);

    /* Initialize the command block before giving it the caller */
    if (cmd != NULL)
        pmcraid_reinit_cmdblk(cmd);
    return cmd;
}

void pmcraid_return_cmd(struct pmcraid_cmd *cmd)
{
    struct pmcraid_instance *pinstance = cmd->drv_inst;
    unsigned long lock_flags;

    spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
    list_add_tail(&cmd->free_list, &pinstance->free_cmd_pool);
    spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
}

static u32 pmcraid_read_interrupts(struct pmcraid_instance *pinstance)
{
    return (pinstance->interrupt_mode) ?
        ioread32(pinstance->int_regs.ioa_host_msix_interrupt_reg) :
        ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
}

static void pmcraid_disable_interrupts(
    struct pmcraid_instance *pinstance,
    u32 intrs
)
{
    u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
    u32 nmask = gmask | GLOBAL_INTERRUPT_MASK;

    iowrite32(intrs, pinstance->int_regs.ioa_host_interrupt_clr_reg);
    iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
    ioread32(pinstance->int_regs.global_interrupt_mask_reg);

    if (!pinstance->interrupt_mode) {
        iowrite32(intrs,
            pinstance->int_regs.ioa_host_interrupt_mask_reg);
        ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
    }
}

static void pmcraid_enable_interrupts(
    struct pmcraid_instance *pinstance,
    u32 intrs
)
{
    u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
    u32 nmask = gmask & (~GLOBAL_INTERRUPT_MASK);

    iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);

    if (!pinstance->interrupt_mode) {
        iowrite32(~intrs,
             pinstance->int_regs.ioa_host_interrupt_mask_reg);
        ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
    }

    pmcraid_info("enabled interrupts global mask = %x intr_mask = %x\n",
        ioread32(pinstance->int_regs.global_interrupt_mask_reg),
        ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg));
}

static void pmcraid_clr_trans_op(
    struct pmcraid_instance *pinstance
)
{
    unsigned long lock_flags;

    if (!pinstance->interrupt_mode) {
        iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
            pinstance->int_regs.ioa_host_interrupt_mask_reg);
        ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
        iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
            pinstance->int_regs.ioa_host_interrupt_clr_reg);
        ioread32(pinstance->int_regs.ioa_host_interrupt_clr_reg);
    }

    if (pinstance->reset_cmd != NULL) {
        del_timer(&pinstance->reset_cmd->timer);
        spin_lock_irqsave(
            pinstance->host->host_lock, lock_flags);
        pinstance->reset_cmd->cmd_done(pinstance->reset_cmd);
        spin_unlock_irqrestore(
            pinstance->host->host_lock, lock_flags);
    }
}

static void pmcraid_reset_type(struct pmcraid_instance *pinstance)
{
    u32 mask;
    u32 intrs;
    u32 alerts;

    mask = ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
    intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
    alerts = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);

    if ((mask & INTRS_HRRQ_VALID) == 0 ||
        (alerts & DOORBELL_IOA_RESET_ALERT) ||
        (intrs & PMCRAID_ERROR_INTERRUPTS)) {
        pmcraid_info("IOA requires hard reset\n");
        pinstance->ioa_hard_reset = 1;
    }

    /* If unit check is active, trigger the dump */
    if (intrs & INTRS_IOA_UNIT_CHECK)
        pinstance->ioa_unit_check = 1;
}

static void pmcraid_ioa_reset(struct pmcraid_cmd *);

static void pmcraid_bist_done(struct pmcraid_cmd *cmd)
{
    struct pmcraid_instance *pinstance = cmd->drv_inst;
    unsigned long lock_flags;
    int rc;
    u16 pci_reg;

    rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);

    /* If PCI config space can't be accessed wait for another two secs */
    if ((rc != PCIBIOS_SUCCESSFUL || (!(pci_reg & PCI_COMMAND_MEMORY))) &&
        cmd->time_left > 0) {
        pmcraid_info("BIST not complete, waiting another 2 secs\n");
        cmd->timer.expires = jiffies + cmd->time_left;
        cmd->time_left = 0;
        cmd->timer.data = (unsigned long)cmd;
        cmd->timer.function =
            (void (*)(unsigned long))pmcraid_bist_done;
        add_timer(&cmd->timer);
    } else {
        cmd->time_left = 0;
        pmcraid_info("BIST is complete, proceeding with reset\n");
        spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
        pmcraid_ioa_reset(cmd);
        spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
    }
}

static void pmcraid_start_bist(struct pmcraid_cmd *cmd)
{
    struct pmcraid_instance *pinstance = cmd->drv_inst;
    u32 doorbells, intrs;

    /* proceed with bist and wait for 2 seconds */
    iowrite32(DOORBELL_IOA_START_BIST,
        pinstance->int_regs.host_ioa_interrupt_reg);
    doorbells = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
    intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
    pmcraid_info("doorbells after start bist: %x intrs: %x\n",
              doorbells, intrs);

    cmd->time_left = msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
    cmd->timer.data = (unsigned long)cmd;
    cmd->timer.expires = jiffies + msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
    cmd->timer.function = (void (*)(unsigned long))pmcraid_bist_done;
    add_timer(&cmd->timer);
}

static void pmcraid_reset_alert_done(struct pmcraid_cmd *cmd)
{
    struct pmcraid_instance *pinstance = cmd->drv_inst;
    u32 status = ioread32(pinstance->ioa_status);
    unsigned long lock_flags;

    /* if the critical operation in progress bit is set or the wait times
     * out, invoke reset engine to proceed with hard reset. If there is
     * some more time to wait, restart the timer
     */
    if (((status & INTRS_CRITICAL_OP_IN_PROGRESS) == 0) ||
        cmd->time_left <= 0) {
        pmcraid_info("critical op is reset proceeding with reset\n");
        spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
        pmcraid_ioa_reset(cmd);
        spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
    } else {
        pmcraid_info("critical op is not yet reset waiting again\n");
        /* restart timer if some more time is available to wait */
        cmd->time_left -= PMCRAID_CHECK_FOR_RESET_TIMEOUT;
        cmd->timer.data = (unsigned long)cmd;
        cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
        cmd->timer.function =
            (void (*)(unsigned long))pmcraid_reset_alert_done;
        add_timer(&cmd->timer);
    }
}

static void pmcraid_notify_ioastate(struct pmcraid_instance *, u32);
static void pmcraid_reset_alert(struct pmcraid_cmd *cmd)
{
    struct pmcraid_instance *pinstance = cmd->drv_inst;
    u32 doorbells;
    int rc;
    u16 pci_reg;

    /* If we are able to access IOA PCI config space, alert IOA that we are
     * going to reset it soon. This enables IOA to preserv persistent error
     * data if any. In case memory space is not accessible, proceed with
     * BIST or slot_reset
     */
    rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
    if ((rc == PCIBIOS_SUCCESSFUL) && (pci_reg & PCI_COMMAND_MEMORY)) {

        /* wait for IOA permission i.e until CRITICAL_OPERATION bit is
         * reset IOA doesn't generate any interrupts when CRITICAL
         * OPERATION bit is reset. A timer is started to wait for this
         * bit to be reset.
         */
        cmd->time_left = PMCRAID_RESET_TIMEOUT;
        cmd->timer.data = (unsigned long)cmd;
        cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
        cmd->timer.function =
            (void (*)(unsigned long))pmcraid_reset_alert_done;
        add_timer(&cmd->timer);

        iowrite32(DOORBELL_IOA_RESET_ALERT,
            pinstance->int_regs.host_ioa_interrupt_reg);
        doorbells =
            ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
        pmcraid_info("doorbells after reset alert: %x\n", doorbells);
    } else {
        pmcraid_info("PCI config is not accessible starting BIST\n");
        pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
        pmcraid_start_bist(cmd);
    }
}

static void pmcraid_timeout_handler(struct pmcraid_cmd *cmd)
{
    struct pmcraid_instance *pinstance = cmd->drv_inst;
    unsigned long lock_flags;

    dev_info(&pinstance->pdev->dev,
        "Adapter being reset due to cmd(CDB[0] = %x) timeout\n",
        cmd->ioa_cb->ioarcb.cdb[0]);

    /* Command timeouts result in hard reset sequence. The command that got
     * timed out may be the one used as part of reset sequence. In this
     * case restart reset sequence using the same command block even if
     * reset is in progress. Otherwise fail this command and get a free
     * command block to restart the reset sequence.
     */
    spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
    if (!pinstance->ioa_reset_in_progress) {
        pinstance->ioa_reset_attempts = 0;
        cmd = pmcraid_get_free_cmd(pinstance);

        /* If we are out of command blocks, just return here itself.
         * Some other command's timeout handler can do the reset job
         */
        if (cmd == NULL) {
            spin_unlock_irqrestore(pinstance->host->host_lock,
                           lock_flags);
            pmcraid_err("no free cmnd block for timeout handler\n");
            return;
        }

        pinstance->reset_cmd = cmd;
        pinstance->ioa_reset_in_progress = 1;
    } else {
        pmcraid_info("reset is already in progress\n");

        if (pinstance->reset_cmd != cmd) {
            /* This command should have been given to IOA, this
             * command will be completed by fail_outstanding_cmds
             * anyway
             */
            pmcraid_err("cmd is pending but reset in progress\n");
        }

        /* If this command was being used as part of the reset
         * sequence, set cmd_done pointer to pmcraid_ioa_reset. This
         * causes fail_outstanding_commands not to return the command
         * block back to free pool
         */
        if (cmd == pinstance->reset_cmd)
            cmd->cmd_done = pmcraid_ioa_reset;
    }

    /* Notify apps of important IOA bringup/bringdown sequences */
    if (pinstance->scn.ioa_state != PMC_DEVICE_EVENT_RESET_START &&
        pinstance->scn.ioa_state != PMC_DEVICE_EVENT_SHUTDOWN_START)
        pmcraid_notify_ioastate(pinstance,
                    PMC_DEVICE_EVENT_RESET_START);

    pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
    scsi_block_requests(pinstance->host);
    pmcraid_reset_alert(cmd);
    spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
}

static void pmcraid_internal_done(struct pmcraid_cmd *cmd)
{
    pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
             cmd->ioa_cb->ioarcb.cdb[0],
             le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));

    /* Some of the internal commands are sent with callers blocking for the
     * response. Same will be indicated as part of cmd->completion_req
     * field. Response path needs to wake up any waiters waiting for cmd
     * completion if this flag is set.
     */
    if (cmd->completion_req) {
        cmd->completion_req = 0;
        complete(&cmd->wait_for_completion);
    }

    /* most of the internal commands are completed by caller itself, so
     * no need to return the command block back to free pool until we are
     * required to do so (e.g once done with initialization).
     */
    if (cmd->release) {
        cmd->release = 0;
        pmcraid_return_cmd(cmd);
    }
}

static void pmcraid_reinit_cfgtable_done(struct pmcraid_cmd *cmd)
{
    pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
             cmd->ioa_cb->ioarcb.cdb[0],
             le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));

    if (cmd->release) {
        cmd->release = 0;
        pmcraid_return_cmd(cmd);
    }
    pmcraid_info("scheduling worker for config table reinitialization\n");
    schedule_work(&cmd->drv_inst->worker_q);
}

static void pmcraid_erp_done(struct pmcraid_cmd *cmd)
{
    struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
    struct pmcraid_instance *pinstance = cmd->drv_inst;
    u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);

    if (PMCRAID_IOASC_SENSE_KEY(ioasc) > 0) {
        scsi_cmd->result |= (DID_ERROR << 16);
        scmd_printk(KERN_INFO, scsi_cmd,
                "command CDB[0] = %x failed with IOASC: 0x%08X\n",
                cmd->ioa_cb->ioarcb.cdb[0], ioasc);
    }

    /* if we had allocated sense buffers for request sense, copy the sense
     * release the buffers
     */
    if (cmd->sense_buffer != NULL) {
        memcpy(scsi_cmd->sense_buffer,
               cmd->sense_buffer,
               SCSI_SENSE_BUFFERSIZE);
        pci_free_consistent(pinstance->pdev,
                    SCSI_SENSE_BUFFERSIZE,
                    cmd->sense_buffer, cmd->sense_buffer_dma);
        cmd->sense_buffer = NULL;
        cmd->sense_buffer_dma = 0;
    }

    scsi_dma_unmap(scsi_cmd);
    pmcraid_return_cmd(cmd);
    scsi_cmd->scsi_done(scsi_cmd);
}

static void _pmcraid_fire_command(struct pmcraid_cmd *cmd)
{
    struct pmcraid_instance *pinstance = cmd->drv_inst;
    unsigned long lock_flags;

    /* Add this command block to pending cmd pool. We do this prior to
     * writting IOARCB to ioarrin because IOA might complete the command
     * by the time we are about to add it to the list. Response handler
     * (isr/tasklet) looks for cmd block in the pending pending list.
     */
    spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
    list_add_tail(&cmd->free_list, &pinstance->pending_cmd_pool);
    spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
    atomic_inc(&pinstance->outstanding_cmds);

    /* driver writes lower 32-bit value of IOARCB address only */
    mb();
    iowrite32(le32_to_cpu(cmd->ioa_cb->ioarcb.ioarcb_bus_addr),
          pinstance->ioarrin);
}

static void pmcraid_send_cmd(
    struct pmcraid_cmd *cmd,
    void (*cmd_done) (struct pmcraid_cmd *),
    unsigned long timeout,
    void (*timeout_func) (struct pmcraid_cmd *)
)
{
    /* initialize done function */
    cmd->cmd_done = cmd_done;

    if (timeout_func) {
        /* setup timeout handler */
        cmd->timer.data = (unsigned long)cmd;
        cmd->timer.expires = jiffies + timeout;
        cmd->timer.function = (void (*)(unsigned long))timeout_func;
        add_timer(&cmd->timer);
    }

    /* fire the command to IOA */
    _pmcraid_fire_command(cmd);
}

static void pmcraid_ioa_shutdown_done(struct pmcraid_cmd *cmd)
{
    struct pmcraid_instance *pinstance = cmd->drv_inst;
    unsigned long lock_flags;

    spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
    pmcraid_ioa_reset(cmd);
    spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
}

static void pmcraid_ioa_shutdown(struct pmcraid_cmd *cmd)
{
    pmcraid_info("response for Cancel CCN CDB[0] = %x ioasc = %x\n",
             cmd->ioa_cb->ioarcb.cdb[0],
             le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));

    /* Note that commands sent during reset require next command to be sent
     * to IOA. Hence reinit the done function as well as timeout function
     */
    pmcraid_reinit_cmdblk(cmd);
    cmd->ioa_cb->ioarcb.request_type = REQ_TYPE_IOACMD;
    cmd->ioa_cb->ioarcb.resource_handle =
        cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
    cmd->ioa_cb->ioarcb.cdb[0] = PMCRAID_IOA_SHUTDOWN;
    cmd->ioa_cb->ioarcb.cdb[1] = PMCRAID_SHUTDOWN_NORMAL;

    /* fire shutdown command to hardware. */
    pmcraid_info("firing normal shutdown command (%d) to IOA\n",
             le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle));

    pmcraid_notify_ioastate(cmd->drv_inst, PMC_DEVICE_EVENT_SHUTDOWN_START);

    pmcraid_send_cmd(cmd, pmcraid_ioa_shutdown_done,
             PMCRAID_SHUTDOWN_TIMEOUT,
             pmcraid_timeout_handler);
}

static void pmcraid_querycfg(struct pmcraid_cmd *);

static void pmcraid_get_fwversion_done(struct pmcraid_cmd *cmd)
{
    struct pmcraid_instance *pinstance = cmd->drv_inst;
    u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
    unsigned long lock_flags;

    /* configuration table entry size depends on firmware version. If fw
     * version is not known, it is not possible to interpret IOA config
     * table
     */
    if (ioasc) {
        pmcraid_err("IOA Inquiry failed with %x\n", ioasc);
        spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
        pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
        pmcraid_reset_alert(cmd);
        spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
    } else  {
        pmcraid_querycfg(cmd);
    }
}

static void pmcraid_get_fwversion(struct pmcraid_cmd *cmd)
{
    struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
    struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
    struct pmcraid_instance *pinstance = cmd->drv_inst;
    u16 data_size = sizeof(struct pmcraid_inquiry_data);

    pmcraid_reinit_cmdblk(cmd);
    ioarcb->request_type = REQ_TYPE_SCSI;
    ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
    ioarcb->cdb[0] = INQUIRY;
    ioarcb->cdb[1] = 1;
    ioarcb->cdb[2] = 0xD0;
    ioarcb->cdb[3] = (data_size >> 8) & 0xFF;
    ioarcb->cdb[4] = data_size & 0xFF;

    /* Since entire inquiry data it can be part of IOARCB itself
     */
    ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
                    offsetof(struct pmcraid_ioarcb,
                        add_data.u.ioadl[0]));
    ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
    ioarcb->ioarcb_bus_addr &= ~(0x1FULL);

    ioarcb->request_flags0 |= NO_LINK_DESCS;
    ioarcb->data_transfer_length = cpu_to_le32(data_size);
    ioadl = &(ioarcb->add_data.u.ioadl[0]);
    ioadl->flags = IOADL_FLAGS_LAST_DESC;
    ioadl->address = cpu_to_le64(pinstance->inq_data_baddr);
    ioadl->data_len = cpu_to_le32(data_size);

    pmcraid_send_cmd(cmd, pmcraid_get_fwversion_done,
             PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
}

static void pmcraid_identify_hrrq(struct pmcraid_cmd *cmd)
{
    struct pmcraid_instance *pinstance = cmd->drv_inst;
    struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
    int index = cmd->hrrq_index;
    __be64 hrrq_addr = cpu_to_be64(pinstance->hrrq_start_bus_addr[index]);
    u32 hrrq_size = cpu_to_be32(sizeof(u32) * PMCRAID_MAX_CMD);
    void (*done_function)(struct pmcraid_cmd *);

    pmcraid_reinit_cmdblk(cmd);
    cmd->hrrq_index = index + 1;

    if (cmd->hrrq_index < pinstance->num_hrrq) {
        done_function = pmcraid_identify_hrrq;
    } else {
        cmd->hrrq_index = 0;
        done_function = pmcraid_get_fwversion;
    }

    /* Initialize ioarcb */
    ioarcb->request_type = REQ_TYPE_IOACMD;
    ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);

    /* initialize the hrrq number where IOA will respond to this command */
    ioarcb->hrrq_id = index;
    ioarcb->cdb[0] = PMCRAID_IDENTIFY_HRRQ;
    ioarcb->cdb[1] = index;

    /* IOA expects 64-bit pci address to be written in B.E format
     * (i.e cdb[2]=MSByte..cdb[9]=LSB.
     */
    pmcraid_info("HRRQ_IDENTIFY with hrrq:ioarcb:index => %llx:%llx:%x\n",
             hrrq_addr, ioarcb->ioarcb_bus_addr, index);

    memcpy(&(ioarcb->cdb[2]), &hrrq_addr, sizeof(hrrq_addr));
    memcpy(&(ioarcb->cdb[10]), &hrrq_size, sizeof(hrrq_size));

    /* Subsequent commands require HRRQ identification to be successful.
     * Note that this gets called even during reset from SCSI mid-layer
     * or tasklet
     */
    pmcraid_send_cmd(cmd, done_function,
             PMCRAID_INTERNAL_TIMEOUT,
             pmcraid_timeout_handler);
}

static void pmcraid_process_ccn(struct pmcraid_cmd *cmd);
static void pmcraid_process_ldn(struct pmcraid_cmd *cmd);

static void pmcraid_send_hcam_cmd(struct pmcraid_cmd *cmd)
{
    if (cmd->ioa_cb->ioarcb.cdb[1] == PMCRAID_HCAM_CODE_CONFIG_CHANGE)
        atomic_set(&(cmd->drv_inst->ccn.ignore), 0);
    else
        atomic_set(&(cmd->drv_inst->ldn.ignore), 0);

    pmcraid_send_cmd(cmd, cmd->cmd_done, 0, NULL);
}

static struct pmcraid_cmd *pmcraid_init_hcam
(
    struct pmcraid_instance *pinstance,
    u8 type
)
{
    struct pmcraid_cmd *cmd;
    struct pmcraid_ioarcb *ioarcb;
    struct pmcraid_ioadl_desc *ioadl;
    struct pmcraid_hostrcb *hcam;
    void (*cmd_done) (struct pmcraid_cmd *);
    dma_addr_t dma;
    int rcb_size;

    cmd = pmcraid_get_free_cmd(pinstance);

    if (!cmd) {
        pmcraid_err("no free command blocks for hcam\n");
        return cmd;
    }

    if (type == PMCRAID_HCAM_CODE_CONFIG_CHANGE) {
        rcb_size = sizeof(struct pmcraid_hcam_ccn_ext);
        cmd_done = pmcraid_process_ccn;
        dma = pinstance->ccn.baddr + PMCRAID_AEN_HDR_SIZE;
        hcam = &pinstance->ccn;
    } else {
        rcb_size = sizeof(struct pmcraid_hcam_ldn);
        cmd_done = pmcraid_process_ldn;
        dma = pinstance->ldn.baddr + PMCRAID_AEN_HDR_SIZE;
        hcam = &pinstance->ldn;
    }

    /* initialize command pointer used for HCAM registration */
    hcam->cmd = cmd;

    ioarcb = &cmd->ioa_cb->ioarcb;
    ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
                    offsetof(struct pmcraid_ioarcb,
                        add_data.u.ioadl[0]));
    ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
    ioadl = ioarcb->add_data.u.ioadl;

    /* Initialize ioarcb */
    ioarcb->request_type = REQ_TYPE_HCAM;
    ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
    ioarcb->cdb[0] = PMCRAID_HOST_CONTROLLED_ASYNC;
    ioarcb->cdb[1] = type;
    ioarcb->cdb[7] = (rcb_size >> 8) & 0xFF;
    ioarcb->cdb[8] = (rcb_size) & 0xFF;

    ioarcb->data_transfer_length = cpu_to_le32(rcb_size);

    ioadl[0].flags |= IOADL_FLAGS_READ_LAST;
    ioadl[0].data_len = cpu_to_le32(rcb_size);
    ioadl[0].address = cpu_to_le32(dma);

    cmd->cmd_done = cmd_done;
    return cmd;
}

static void pmcraid_send_hcam(struct pmcraid_instance *pinstance, u8 type)
{
    struct pmcraid_cmd *cmd = pmcraid_init_hcam(pinstance, type);
    pmcraid_send_hcam_cmd(cmd);
}


static void pmcraid_prepare_cancel_cmd(
    struct pmcraid_cmd *cmd,
    struct pmcraid_cmd *cmd_to_cancel
)
{
    struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
    __be64 ioarcb_addr = cmd_to_cancel->ioa_cb->ioarcb.ioarcb_bus_addr;

    /* Get the resource handle to where the command to be aborted has been
     * sent.
     */
    ioarcb->resource_handle = cmd_to_cancel->ioa_cb->ioarcb.resource_handle;
    ioarcb->request_type = REQ_TYPE_IOACMD;
    memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
    ioarcb->cdb[0] = PMCRAID_ABORT_CMD;

    /* IOARCB address of the command to be cancelled is given in
     * cdb[2]..cdb[9] is Big-Endian format. Note that length bits in
     * IOARCB address are not masked.
     */
    ioarcb_addr = cpu_to_be64(ioarcb_addr);
    memcpy(&(ioarcb->cdb[2]), &ioarcb_addr, sizeof(ioarcb_addr));
}

static void pmcraid_cancel_hcam(
    struct pmcraid_cmd *cmd,
    u8 type,
    void (*cmd_done) (struct pmcraid_cmd *)
)
{
    struct pmcraid_instance *pinstance;
    struct pmcraid_hostrcb  *hcam;

    pinstance = cmd->drv_inst;
    hcam =  (type == PMCRAID_HCAM_CODE_LOG_DATA) ?
        &pinstance->ldn : &pinstance->ccn;

    /* prepare for cancelling previous hcam command. If the HCAM is
     * currently not pending with IOA, we would have hcam->cmd as non-null
     */
    if (hcam->cmd == NULL)
        return;

    pmcraid_prepare_cancel_cmd(cmd, hcam->cmd);

    /* writing to IOARRIN must be protected by host_lock, as mid-layer
     * schedule queuecommand while we are doing this
     */
    pmcraid_send_cmd(cmd, cmd_done,
             PMCRAID_INTERNAL_TIMEOUT,
             pmcraid_timeout_handler);
}

static void pmcraid_cancel_ccn(struct pmcraid_cmd *cmd)
{
    pmcraid_info("response for Cancel LDN CDB[0] = %x ioasc = %x\n",
             cmd->ioa_cb->ioarcb.cdb[0],
             le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));

    pmcraid_reinit_cmdblk(cmd);

    pmcraid_cancel_hcam(cmd,
                PMCRAID_HCAM_CODE_CONFIG_CHANGE,
                pmcraid_ioa_shutdown);
}

static void pmcraid_cancel_ldn(struct pmcraid_cmd *cmd)
{
    pmcraid_cancel_hcam(cmd,
                PMCRAID_HCAM_CODE_LOG_DATA,
                pmcraid_cancel_ccn);
}

static int pmcraid_expose_resource(u16 fw_version,
                   struct pmcraid_config_table_entry *cfgte)
{
    int retval = 0;

    if (cfgte->resource_type == RES_TYPE_VSET) {
        if (fw_version <= PMCRAID_FW_VERSION_1)
            retval = ((cfgte->unique_flags1 & 0x80) == 0);
        else
            retval = ((cfgte->unique_flags0 & 0x80) == 0 &&
                  (cfgte->unique_flags1 & 0x80) == 0);

    } else if (cfgte->resource_type == RES_TYPE_GSCSI)
        retval = (RES_BUS(cfgte->resource_address) !=
                PMCRAID_VIRTUAL_ENCL_BUS_ID);
    return retval;
}

/* attributes supported by pmcraid_event_family */
enum {
    PMCRAID_AEN_ATTR_UNSPEC,
    PMCRAID_AEN_ATTR_EVENT,
    __PMCRAID_AEN_ATTR_MAX,
};
#define PMCRAID_AEN_ATTR_MAX (__PMCRAID_AEN_ATTR_MAX - 1)

/* commands supported by pmcraid_event_family */
enum {
    PMCRAID_AEN_CMD_UNSPEC,
    PMCRAID_AEN_CMD_EVENT,
    __PMCRAID_AEN_CMD_MAX,
};
#define PMCRAID_AEN_CMD_MAX (__PMCRAID_AEN_CMD_MAX - 1)

static struct genl_family pmcraid_event_family = {
    .id = GENL_ID_GENERATE,
    .name = "pmcraid",
    .version = 1,
    .maxattr = PMCRAID_AEN_ATTR_MAX
};

static int pmcraid_netlink_init(void)
{
    int result;

    result = genl_register_family(&pmcraid_event_family);

    if (result)
        return result;

    pmcraid_info("registered NETLINK GENERIC group: %d\n",
             pmcraid_event_family.id);

    return result;
}

static void pmcraid_netlink_release(void)
{
    genl_unregister_family(&pmcraid_event_family);
}

static int pmcraid_notify_aen(
    struct pmcraid_instance *pinstance,
    struct pmcraid_aen_msg  *aen_msg,
    u32    data_size
)
{
    struct sk_buff *skb;
    void *msg_header;
    u32  total_size, nla_genl_hdr_total_size;
    int result;

    aen_msg->hostno = (pinstance->host->unique_id << 16 |
               MINOR(pinstance->cdev.dev));
    aen_msg->length = data_size;

    data_size += sizeof(*aen_msg);

    total_size = nla_total_size(data_size);
    /* Add GENL_HDR to total_size */
    nla_genl_hdr_total_size =
        (total_size + (GENL_HDRLEN +
        ((struct genl_family *)&pmcraid_event_family)->hdrsize)
         + NLMSG_HDRLEN);
    skb = genlmsg_new(nla_genl_hdr_total_size, GFP_ATOMIC);


    if (!skb) {
        pmcraid_err("Failed to allocate aen data SKB of size: %x\n",
                 total_size);
        return -ENOMEM;
    }

    /* add the genetlink message header */
    msg_header = genlmsg_put(skb, 0, 0,
                 &pmcraid_event_family, 0,
                 PMCRAID_AEN_CMD_EVENT);
    if (!msg_header) {
        pmcraid_err("failed to copy command details\n");
        nlmsg_free(skb);
        return -ENOMEM;
    }

    result = nla_put(skb, PMCRAID_AEN_ATTR_EVENT, data_size, aen_msg);

    if (result) {
        pmcraid_err("failed to copy AEN attribute data\n");
        nlmsg_free(skb);
        return -EINVAL;
    }

    /* send genetlink multicast message to notify appplications */
    result = genlmsg_end(skb, msg_header);

    if (result < 0) {
        pmcraid_err("genlmsg_end failed\n");
        nlmsg_free(skb);
        return result;
    }

    result =
        genlmsg_multicast(skb, 0, pmcraid_event_family.id, GFP_ATOMIC);

    /* If there are no listeners, genlmsg_multicast may return non-zero
     * value.
     */
    if (result)
        pmcraid_info("error (%x) sending aen event message\n", result);
    return result;
}

static int pmcraid_notify_ccn(struct pmcraid_instance *pinstance)
{
    return pmcraid_notify_aen(pinstance,
                pinstance->ccn.msg,
                pinstance->ccn.hcam->data_len +
                sizeof(struct pmcraid_hcam_hdr));
}

static int pmcraid_notify_ldn(struct pmcraid_instance *pinstance)
{
    return pmcraid_notify_aen(pinstance,
                pinstance->ldn.msg,
                pinstance->ldn.hcam->data_len +
                sizeof(struct pmcraid_hcam_hdr));
}

static void pmcraid_notify_ioastate(struct pmcraid_instance *pinstance, u32 evt)
{
    pinstance->scn.ioa_state = evt;
    pmcraid_notify_aen(pinstance,
              &pinstance->scn.msg,
              sizeof(u32));
}

static void pmcraid_handle_config_change(struct pmcraid_instance *pinstance)
{
    struct pmcraid_config_table_entry *cfg_entry;
    struct pmcraid_hcam_ccn *ccn_hcam;
    struct pmcraid_cmd *cmd;
    struct pmcraid_cmd *cfgcmd;
    struct pmcraid_resource_entry *res = NULL;
    unsigned long lock_flags;
    unsigned long host_lock_flags;
    u32 new_entry = 1;
    u32 hidden_entry = 0;
    u16 fw_version;
    int rc;

    ccn_hcam = (struct pmcraid_hcam_ccn *)pinstance->ccn.hcam;
    cfg_entry = &ccn_hcam->cfg_entry;
    fw_version = be16_to_cpu(pinstance->inq_data->fw_version);

    pmcraid_info("CCN(%x): %x timestamp: %llx type: %x lost: %x flags: %x \
         res: %x:%x:%x:%x\n",
         pinstance->ccn.hcam->ilid,
         pinstance->ccn.hcam->op_code,
        ((pinstance->ccn.hcam->timestamp1) |
        ((pinstance->ccn.hcam->timestamp2 & 0xffffffffLL) << 32)),
         pinstance->ccn.hcam->notification_type,
         pinstance->ccn.hcam->notification_lost,
         pinstance->ccn.hcam->flags,
         pinstance->host->unique_id,
         RES_IS_VSET(*cfg_entry) ? PMCRAID_VSET_BUS_ID :
         (RES_IS_GSCSI(*cfg_entry) ? PMCRAID_PHYS_BUS_ID :
            RES_BUS(cfg_entry->resource_address)),
         RES_IS_VSET(*cfg_entry) ?
            (fw_version <= PMCRAID_FW_VERSION_1 ?
                cfg_entry->unique_flags1 :
                    cfg_entry->array_id & 0xFF) :
            RES_TARGET(cfg_entry->resource_address),
         RES_LUN(cfg_entry->resource_address));


    /* If this HCAM indicates a lost notification, read the config table */
    if (pinstance->ccn.hcam->notification_lost) {
        cfgcmd = pmcraid_get_free_cmd(pinstance);
        if (cfgcmd) {
            pmcraid_info("lost CCN, reading config table\b");
            pinstance->reinit_cfg_table = 1;
            pmcraid_querycfg(cfgcmd);
        } else {
            pmcraid_err("lost CCN, no free cmd for querycfg\n");
        }
        goto out_notify_apps;
    }

    /* If this resource is not going to be added to mid-layer, just notify
     * applications and return. If this notification is about hiding a VSET
     * resource, check if it was exposed already.
     */
    if (pinstance->ccn.hcam->notification_type ==
        NOTIFICATION_TYPE_ENTRY_CHANGED &&
        cfg_entry->resource_type == RES_TYPE_VSET) {

        if (fw_version <= PMCRAID_FW_VERSION_1)
            hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;
        else
            hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;

    } else if (!pmcraid_expose_resource(fw_version, cfg_entry)) {
        goto out_notify_apps;
    }

    spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
    list_for_each_entry(res, &pinstance->used_res_q, queue) {
        rc = memcmp(&res->cfg_entry.resource_address,
                &cfg_entry->resource_address,
                sizeof(cfg_entry->resource_address));
        if (!rc) {
            new_entry = 0;
            break;
        }
    }

    if (new_entry) {

        if (hidden_entry) {
            spin_unlock_irqrestore(&pinstance->resource_lock,
                        lock_flags);
            goto out_notify_apps;
        }

        /* If there are more number of resources than what driver can
         * manage, do not notify the applications about the CCN. Just
         * ignore this notifications and re-register the same HCAM
         */
        if (list_empty(&pinstance->free_res_q)) {
            spin_unlock_irqrestore(&pinstance->resource_lock,
                        lock_flags);
            pmcraid_err("too many resources attached\n");
            spin_lock_irqsave(pinstance->host->host_lock,
                      host_lock_flags);
            pmcraid_send_hcam(pinstance,
                      PMCRAID_HCAM_CODE_CONFIG_CHANGE);
            spin_unlock_irqrestore(pinstance->host->host_lock,
                           host_lock_flags);
            return;
        }

        res = list_entry(pinstance->free_res_q.next,
                 struct pmcraid_resource_entry, queue);

        list_del(&res->queue);
        res->scsi_dev = NULL;
        res->reset_progress = 0;
        list_add_tail(&res->queue, &pinstance->used_res_q);
    }

    memcpy(&res->cfg_entry, cfg_entry, pinstance->config_table_entry_size);

    if (pinstance->ccn.hcam->notification_type ==
        NOTIFICATION_TYPE_ENTRY_DELETED || hidden_entry) {
        if (res->scsi_dev) {
            if (fw_version <= PMCRAID_FW_VERSION_1)
                res->cfg_entry.unique_flags1 &= 0x7F;
            else
                res->cfg_entry.array_id &= 0xFF;
            res->change_detected = RES_CHANGE_DEL;
            res->cfg_entry.resource_handle =
                PMCRAID_INVALID_RES_HANDLE;
            schedule_work(&pinstance->worker_q);
        } else {
            /* This may be one of the non-exposed resources */
            list_move_tail(&res->queue, &pinstance->free_res_q);
        }
    } else if (!res->scsi_dev) {
        res->change_detected = RES_CHANGE_ADD;
        schedule_work(&pinstance->worker_q);
    }
    spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);

out_notify_apps:

    /* Notify configuration changes to registered applications.*/
    if (!pmcraid_disable_aen)
        pmcraid_notify_ccn(pinstance);

    cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
    if (cmd)
        pmcraid_send_hcam_cmd(cmd);
}

static struct pmcraid_ioasc_error *pmcraid_get_error_info(u32 ioasc)
{
    int i;
    for (i = 0; i < ARRAY_SIZE(pmcraid_ioasc_error_table); i++) {
        if (pmcraid_ioasc_error_table[i].ioasc_code == ioasc)
            return &pmcraid_ioasc_error_table[i];
    }
    return NULL;
}

void pmcraid_ioasc_logger(u32 ioasc, struct pmcraid_cmd *cmd)
{
    struct pmcraid_ioasc_error *error_info = pmcraid_get_error_info(ioasc);

    if (error_info == NULL ||
        cmd->drv_inst->current_log_level < error_info->log_level)
        return;

    /* log the error string */
    pmcraid_err("cmd [%x] for resource %x failed with %x(%s)\n",
        cmd->ioa_cb->ioarcb.cdb[0],
        cmd->ioa_cb->ioarcb.resource_handle,
        le32_to_cpu(ioasc), error_info->error_string);
}

static void pmcraid_handle_error_log(struct pmcraid_instance *pinstance)
{
    struct pmcraid_hcam_ldn *hcam_ldn;
    u32 ioasc;

    hcam_ldn = (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;

    pmcraid_info
        ("LDN(%x): %x type: %x lost: %x flags: %x overlay id: %x\n",
         pinstance->ldn.hcam->ilid,
         pinstance->ldn.hcam->op_code,
         pinstance->ldn.hcam->notification_type,
         pinstance->ldn.hcam->notification_lost,
         pinstance->ldn.hcam->flags,
         pinstance->ldn.hcam->overlay_id);

    /* log only the errors, no need to log informational log entries */
    if (pinstance->ldn.hcam->notification_type !=
        NOTIFICATION_TYPE_ERROR_LOG)
        return;

    if (pinstance->ldn.hcam->notification_lost ==
        HOSTRCB_NOTIFICATIONS_LOST)
        dev_info(&pinstance->pdev->dev, "Error notifications lost\n");

    ioasc = le32_to_cpu(hcam_ldn->error_log.fd_ioasc);

    if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
        ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER) {
        dev_info(&pinstance->pdev->dev,
            "UnitAttention due to IOA Bus Reset\n");
        scsi_report_bus_reset(
            pinstance->host,
            RES_BUS(hcam_ldn->error_log.fd_ra));
    }

    return;
}

static void pmcraid_process_ccn(struct pmcraid_cmd *cmd)
{
    struct pmcraid_instance *pinstance = cmd->drv_inst;
    u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
    unsigned long lock_flags;

    pinstance->ccn.cmd = NULL;
    pmcraid_return_cmd(cmd);

    /* If driver initiated IOA reset happened while this hcam was pending
     * with IOA, or IOA bringdown sequence is in progress, no need to
     * re-register the hcam
     */
    if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
        atomic_read(&pinstance->ccn.ignore) == 1) {
        return;
    } else if (ioasc) {
        dev_info(&pinstance->pdev->dev,
            "Host RCB (CCN) failed with IOASC: 0x%08X\n", ioasc);
        spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
        pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
        spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
    } else {
        pmcraid_handle_config_change(pinstance);
    }
}

static void pmcraid_initiate_reset(struct pmcraid_instance *);
static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd);

static void pmcraid_process_ldn(struct pmcraid_cmd *cmd)
{
    struct pmcraid_instance *pinstance = cmd->drv_inst;
    struct pmcraid_hcam_ldn *ldn_hcam =
            (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
    u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
    u32 fd_ioasc = le32_to_cpu(ldn_hcam->error_log.fd_ioasc);
    unsigned long lock_flags;

    /* return the command block back to freepool */
    pinstance->ldn.cmd = NULL;
    pmcraid_return_cmd(cmd);

    /* If driver initiated IOA reset happened while this hcam was pending
     * with IOA, no need to re-register the hcam as reset engine will do it
     * once reset sequence is complete
     */
    if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
        atomic_read(&pinstance->ccn.ignore) == 1) {
        return;
    } else if (!ioasc) {
        pmcraid_handle_error_log(pinstance);
        if (fd_ioasc == PMCRAID_IOASC_NR_IOA_RESET_REQUIRED) {
            spin_lock_irqsave(pinstance->host->host_lock,
                      lock_flags);
            pmcraid_initiate_reset(pinstance);
            spin_unlock_irqrestore(pinstance->host->host_lock,
                           lock_flags);
            return;
        }
        if (fd_ioasc == PMCRAID_IOASC_TIME_STAMP_OUT_OF_SYNC) {
            pinstance->timestamp_error = 1;
            pmcraid_set_timestamp(cmd);
        }
    } else {
        dev_info(&pinstance->pdev->dev,
            "Host RCB(LDN) failed with IOASC: 0x%08X\n", ioasc);
    }
    /* send netlink message for HCAM notification if enabled */
    if (!pmcraid_disable_aen)
        pmcraid_notify_ldn(pinstance);

    cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
    if (cmd)
        pmcraid_send_hcam_cmd(cmd);
}

static void pmcraid_register_hcams(struct pmcraid_instance *pinstance)
{
    pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
    pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
}

static void pmcraid_unregister_hcams(struct pmcraid_cmd *cmd)
{
    struct pmcraid_instance *pinstance = cmd->drv_inst;

    /* During IOA bringdown, HCAM gets fired and tasklet proceeds with
     * handling hcam response though it is not necessary. In order to
     * prevent this, set 'ignore', so that bring-down sequence doesn't
     * re-send any more hcams
     */
    atomic_set(&pinstance->ccn.ignore, 1);
    atomic_set(&pinstance->ldn.ignore, 1);

    /* If adapter reset was forced as part of runtime reset sequence,
     * start the reset sequence. Reset will be triggered even in case
     * IOA unit_check.
     */
    if ((pinstance->force_ioa_reset && !pinstance->ioa_bringdown) ||
         pinstance->ioa_unit_check) {
        pinstance->force_ioa_reset = 0;
        pinstance->ioa_unit_check = 0;
        pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
        pmcraid_reset_alert(cmd);
        return;
    }

    /* Driver tries to cancel HCAMs by sending ABORT TASK for each HCAM
     * one after the other. So CCN cancellation will be triggered by
     * pmcraid_cancel_ldn itself.
     */
    pmcraid_cancel_ldn(cmd);
}

static void pmcraid_reinit_buffers(struct pmcraid_instance *);

static int pmcraid_reset_enable_ioa(struct pmcraid_instance *pinstance)
{
    u32 intrs;

    pmcraid_reinit_buffers(pinstance);
    intrs = pmcraid_read_interrupts(pinstance);

    pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);

    if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
        if (!pinstance->interrupt_mode) {
            iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
                pinstance->int_regs.
                ioa_host_interrupt_mask_reg);
            iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
                pinstance->int_regs.ioa_host_interrupt_clr_reg);
        }
        return 1;
    } else {
        return 0;
    }
}

static void pmcraid_soft_reset(struct pmcraid_cmd *cmd)
{
    struct pmcraid_instance *pinstance = cmd->drv_inst;
    u32 int_reg;
    u32 doorbell;

    /* There will be an interrupt when Transition to Operational bit is
     * set so tasklet would execute next reset task. The timeout handler
     * would re-initiate a reset
     */
    cmd->cmd_done = pmcraid_ioa_reset;
    cmd->timer.data = (unsigned long)cmd;
    cmd->timer.expires = jiffies +
                 msecs_to_jiffies(PMCRAID_TRANSOP_TIMEOUT);
    cmd->timer.function = (void (*)(unsigned long))pmcraid_timeout_handler;

    if (!timer_pending(&cmd->timer))
        add_timer(&cmd->timer);

    /* Enable destructive diagnostics on IOA if it is not yet in
     * operational state
     */
    doorbell = DOORBELL_RUNTIME_RESET |
           DOORBELL_ENABLE_DESTRUCTIVE_DIAGS;

    /* Since we do RESET_ALERT and Start BIST we have to again write
     * MSIX Doorbell to indicate the interrupt mode
     */
    if (pinstance->interrupt_mode) {
        iowrite32(DOORBELL_INTR_MODE_MSIX,
              pinstance->int_regs.host_ioa_interrupt_reg);
        ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
    }

    iowrite32(doorbell, pinstance->int_regs.host_ioa_interrupt_reg);
    ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
    int_reg = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);

    pmcraid_info("Waiting for IOA to become operational %x:%x\n",
             ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
             int_reg);
}

static void pmcraid_get_dump(struct pmcraid_instance *pinstance)
{
    pmcraid_info("%s is not yet implemented\n", __func__);
}

static void pmcraid_fail_outstanding_cmds(struct pmcraid_instance *pinstance)
{
    struct pmcraid_cmd *cmd, *temp;
    unsigned long lock_flags;

    /* pending command list is protected by pending_pool_lock. Its
     * traversal must be done as within this lock
     */
    spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
    list_for_each_entry_safe(cmd, temp, &pinstance->pending_cmd_pool,
                 free_list) {
        list_del(&cmd->free_list);
        spin_unlock_irqrestore(&pinstance->pending_pool_lock,
                    lock_flags);
        cmd->ioa_cb->ioasa.ioasc =
            cpu_to_le32(PMCRAID_IOASC_IOA_WAS_RESET);
        cmd->ioa_cb->ioasa.ilid =
            cpu_to_be32(PMCRAID_DRIVER_ILID);

        /* In case the command timer is still running */
        del_timer(&cmd->timer);

        /* If this is an IO command, complete it by invoking scsi_done
         * function. If this is one of the internal commands other
         * than pmcraid_ioa_reset and HCAM commands invoke cmd_done to
         * complete it
         */
        if (cmd->scsi_cmd) {

            struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
            __le32 resp = cmd->ioa_cb->ioarcb.response_handle;

            scsi_cmd->result |= DID_ERROR << 16;

            scsi_dma_unmap(scsi_cmd);
            pmcraid_return_cmd(cmd);

            pmcraid_info("failing(%d) CDB[0] = %x result: %x\n",
                     le32_to_cpu(resp) >> 2,
                     cmd->ioa_cb->ioarcb.cdb[0],
                     scsi_cmd->result);
            scsi_cmd->scsi_done(scsi_cmd);
        } else if (cmd->cmd_done == pmcraid_internal_done ||
               cmd->cmd_done == pmcraid_erp_done) {
            cmd->cmd_done(cmd);
        } else if (cmd->cmd_done != pmcraid_ioa_reset &&
               cmd->cmd_done != pmcraid_ioa_shutdown_done) {
            pmcraid_return_cmd(cmd);
        }

        atomic_dec(&pinstance->outstanding_cmds);
        spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
    }

    spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
}

static void pmcraid_ioa_reset(struct pmcraid_cmd *cmd)
{
    struct pmcraid_instance *pinstance = cmd->drv_inst;
    u8 reset_complete = 0;

    pinstance->ioa_reset_in_progress = 1;

    if (pinstance->reset_cmd != cmd) {
        pmcraid_err("reset is called with different command block\n");
        pinstance->reset_cmd = cmd;
    }

    pmcraid_info("reset_engine: state = %d, command = %p\n",
              pinstance->ioa_state, cmd);

    switch (pinstance->ioa_state) {

    case IOA_STATE_DEAD:
        /* If IOA is offline, whatever may be the reset reason, just
         * return. callers might be waiting on the reset wait_q, wake
         * up them
         */
        pmcraid_err("IOA is offline no reset is possible\n");
        reset_complete = 1;
        break;

    case IOA_STATE_IN_BRINGDOWN:
        /* we enter here, once ioa shutdown command is processed by IOA
         * Alert IOA for a possible reset. If reset alert fails, IOA
         * goes through hard-reset
         */
        pmcraid_disable_interrupts(pinstance, ~0);
        pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
        pmcraid_reset_alert(cmd);
        break;

    case IOA_STATE_UNKNOWN:
        /* We may be called during probe or resume. Some pre-processing
         * is required for prior to reset
         */
        scsi_block_requests(pinstance->host);

        /* If asked to reset while IOA was processing responses or
         * there are any error responses then IOA may require
         * hard-reset.
         */
        if (pinstance->ioa_hard_reset == 0) {
            if (ioread32(pinstance->ioa_status) &
                INTRS_TRANSITION_TO_OPERATIONAL) {
                pmcraid_info("sticky bit set, bring-up\n");
                pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
                pmcraid_reinit_cmdblk(cmd);
                pmcraid_identify_hrrq(cmd);
            } else {
                pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
                pmcraid_soft_reset(cmd);
            }
        } else {
            /* Alert IOA of a possible reset and wait for critical
             * operation in progress bit to reset
             */
            pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
            pmcraid_reset_alert(cmd);
        }
        break;

    case IOA_STATE_IN_RESET_ALERT:
        /* If critical operation in progress bit is reset or wait gets
         * timed out, reset proceeds with starting BIST on the IOA.
         * pmcraid_ioa_hard_reset keeps a count of reset attempts. If
         * they are 3 or more, reset engine marks IOA dead and returns
         */
        pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
        pmcraid_start_bist(cmd);
        break;

    case IOA_STATE_IN_HARD_RESET:
        pinstance->ioa_reset_attempts++;

        /* retry reset if we haven't reached maximum allowed limit */
        if (pinstance->ioa_reset_attempts > PMCRAID_RESET_ATTEMPTS) {
            pinstance->ioa_reset_attempts = 0;
            pmcraid_err("IOA didn't respond marking it as dead\n");
            pinstance->ioa_state = IOA_STATE_DEAD;

            if (pinstance->ioa_bringdown)
                pmcraid_notify_ioastate(pinstance,
                    PMC_DEVICE_EVENT_SHUTDOWN_FAILED);
            else
                pmcraid_notify_ioastate(pinstance,
                        PMC_DEVICE_EVENT_RESET_FAILED);
            reset_complete = 1;
            break;
        }

        /* Once either bist or pci reset is done, restore PCI config
         * space. If this fails, proceed with hard reset again
         */
        pci_restore_state(pinstance->pdev);

        /* fail all pending commands */
        pmcraid_fail_outstanding_cmds(pinstance);

        /* check if unit check is active, if so extract dump */
        if (pinstance->ioa_unit_check) {
            pmcraid_info("unit check is active\n");
            pinstance->ioa_unit_check = 0;
            pmcraid_get_dump(pinstance);
            pinstance->ioa_reset_attempts--;
            pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
            pmcraid_reset_alert(cmd);
            break;
        }

        /* if the reset reason is to bring-down the ioa, we might be
         * done with the reset restore pci_config_space and complete
         * the reset
         */
        if (pinstance->ioa_bringdown) {
            pmcraid_info("bringing down the adapter\n");
            pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
            pinstance->ioa_bringdown = 0;
            pinstance->ioa_state = IOA_STATE_UNKNOWN;
            pmcraid_notify_ioastate(pinstance,
                    PMC_DEVICE_EVENT_SHUTDOWN_SUCCESS);
            reset_complete = 1;
        } else {
            /* bring-up IOA, so proceed with soft reset
             * Reinitialize hrrq_buffers and their indices also
             * enable interrupts after a pci_restore_state
             */
            if (pmcraid_reset_enable_ioa(pinstance)) {
                pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
                pmcraid_info("bringing up the adapter\n");
                pmcraid_reinit_cmdblk(cmd);
                pmcraid_identify_hrrq(cmd);
            } else {
                pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
                pmcraid_soft_reset(cmd);
            }
        }
        break;

    case IOA_STATE_IN_SOFT_RESET:
        /* TRANSITION TO OPERATIONAL is on so start initialization
         * sequence
         */
        pmcraid_info("In softreset proceeding with bring-up\n");
        pinstance->ioa_state = IOA_STATE_IN_BRINGUP;

        /* Initialization commands start with HRRQ identification. From
         * now on tasklet completes most of the commands as IOA is up
         * and intrs are enabled
         */
        pmcraid_identify_hrrq(cmd);
        break;

    case IOA_STATE_IN_BRINGUP:
        /* we are done with bringing up of IOA, change the ioa_state to
         * operational and wake up any waiters
         */
        pinstance->ioa_state = IOA_STATE_OPERATIONAL;
        reset_complete = 1;
        break;

    case IOA_STATE_OPERATIONAL:
    default:
        /* When IOA is operational and a reset is requested, check for
         * the reset reason. If reset is to bring down IOA, unregister
         * HCAMs and initiate shutdown; if adapter reset is forced then
         * restart reset sequence again
         */
        if (pinstance->ioa_shutdown_type == SHUTDOWN_NONE &&
            pinstance->force_ioa_reset == 0) {
            pmcraid_notify_ioastate(pinstance,
                        PMC_DEVICE_EVENT_RESET_SUCCESS);
            reset_complete = 1;
        } else {
            if (pinstance->ioa_shutdown_type != SHUTDOWN_NONE)
                pinstance->ioa_state = IOA_STATE_IN_BRINGDOWN;
            pmcraid_reinit_cmdblk(cmd);
            pmcraid_unregister_hcams(cmd);
        }
        break;
    }

    /* reset will be completed if ioa_state is either DEAD or UNKNOWN or
     * OPERATIONAL. Reset all control variables used during reset, wake up
     * any waiting threads and let the SCSI mid-layer send commands. Note
     * that host_lock must be held before invoking scsi_report_bus_reset.
     */
    if (reset_complete) {
        pinstance->ioa_reset_in_progress = 0;
        pinstance->ioa_reset_attempts = 0;
        pinstance->reset_cmd = NULL;
        pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
        pinstance->ioa_bringdown = 0;
        pmcraid_return_cmd(cmd);

        /* If target state is to bring up the adapter, proceed with
         * hcam registration and resource exposure to mid-layer.
         */
        if (pinstance->ioa_state == IOA_STATE_OPERATIONAL)
            pmcraid_register_hcams(pinstance);

        wake_up_all(&pinstance->reset_wait_q);
    }

    return;
}

static void pmcraid_initiate_reset(struct pmcraid_instance *pinstance)
{
    struct pmcraid_cmd *cmd;

    /* If the reset is already in progress, just return, otherwise start
     * reset sequence and return
     */
    if (!pinstance->ioa_reset_in_progress) {
        scsi_block_requests(pinstance->host);
        cmd = pmcraid_get_free_cmd(pinstance);

        if (cmd == NULL) {
            pmcraid_err("no cmnd blocks for initiate_reset\n");
            return;
        }

        pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
        pinstance->reset_cmd = cmd;
        pinstance->force_ioa_reset = 1;
        pmcraid_notify_ioastate(pinstance,
                    PMC_DEVICE_EVENT_RESET_START);
        pmcraid_ioa_reset(cmd);
    }
}

static int pmcraid_reset_reload(
    struct pmcraid_instance *pinstance,
    u8 shutdown_type,
    u8 target_state
)
{
    struct pmcraid_cmd *reset_cmd = NULL;
    unsigned long lock_flags;
    int reset = 1;

    spin_lock_irqsave(pinstance->host->host_lock, lock_flags);

    if (pinstance->ioa_reset_in_progress) {
        pmcraid_info("reset_reload: reset is already in progress\n");

        spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);

        wait_event(pinstance->reset_wait_q,
               !pinstance->ioa_reset_in_progress);

        spin_lock_irqsave(pinstance->host->host_lock, lock_flags);

        if (pinstance->ioa_state == IOA_STATE_DEAD) {
            spin_unlock_irqrestore(pinstance->host->host_lock,
                           lock_flags);
            pmcraid_info("reset_reload: IOA is dead\n");
            return reset;
        } else if (pinstance->ioa_state == target_state) {
            reset = 0;
        }
    }

    if (reset) {
        pmcraid_info("reset_reload: proceeding with reset\n");
        scsi_block_requests(pinstance->host);
        reset_cmd = pmcraid_get_free_cmd(pinstance);

        if (reset_cmd == NULL) {
            pmcraid_err("no free cmnd for reset_reload\n");
            spin_unlock_irqrestore(pinstance->host->host_lock,
                           lock_flags);
            return reset;
        }

        if (shutdown_type == SHUTDOWN_NORMAL)
            pinstance->ioa_bringdown = 1;

        pinstance->ioa_shutdown_type = shutdown_type;
        pinstance->reset_cmd = reset_cmd;
        pinstance->force_ioa_reset = reset;
        pmcraid_info("reset_reload: initiating reset\n");
        pmcraid_ioa_reset(reset_cmd);
        spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
        pmcraid_info("reset_reload: waiting for reset to complete\n");
        wait_event(pinstance->reset_wait_q,
               !pinstance->ioa_reset_in_progress);

        pmcraid_info("reset_reload: reset is complete !!\n");
        scsi_unblock_requests(pinstance->host);
        if (pinstance->ioa_state == target_state)
            reset = 0;
    }

    return reset;
}

static int pmcraid_reset_bringdown(struct pmcraid_instance *pinstance)
{
    return pmcraid_reset_reload(pinstance,
                    SHUTDOWN_NORMAL,
                    IOA_STATE_UNKNOWN);
}

static int pmcraid_reset_bringup(struct pmcraid_instance *pinstance)
{
    pmcraid_notify_ioastate(pinstance, PMC_DEVICE_EVENT_RESET_START);

    return pmcraid_reset_reload(pinstance,
                    SHUTDOWN_NONE,
                    IOA_STATE_OPERATIONAL);
}

static void pmcraid_request_sense(struct pmcraid_cmd *cmd)
{
    struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
    struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;

    /* allocate DMAable memory for sense buffers */
    cmd->sense_buffer = pci_alloc_consistent(cmd->drv_inst->pdev,
                         SCSI_SENSE_BUFFERSIZE,
                         &cmd->sense_buffer_dma);

    if (cmd->sense_buffer == NULL) {
        pmcraid_err
            ("couldn't allocate sense buffer for request sense\n");
        pmcraid_erp_done(cmd);
        return;
    }

    /* re-use the command block */
    memset(&cmd->ioa_cb->ioasa, 0, sizeof(struct pmcraid_ioasa));
    memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
    ioarcb->request_flags0 = (SYNC_COMPLETE |
                  NO_LINK_DESCS |
                  INHIBIT_UL_CHECK);
    ioarcb->request_type = REQ_TYPE_SCSI;
    ioarcb->cdb[0] = REQUEST_SENSE;
    ioarcb->cdb[4] = SCSI_SENSE_BUFFERSIZE;

    ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
                    offsetof(struct pmcraid_ioarcb,
                        add_data.u.ioadl[0]));
    ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));

    ioarcb->data_transfer_length = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);

    ioadl->address = cpu_to_le64(cmd->sense_buffer_dma);
    ioadl->data_len = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
    ioadl->flags = IOADL_FLAGS_LAST_DESC;

    /* request sense might be called as part of error response processing
     * which runs in tasklets context. It is possible that mid-layer might
     * schedule queuecommand during this time, hence, writting to IOARRIN
     * must be protect by host_lock
     */
    pmcraid_send_cmd(cmd, pmcraid_erp_done,
             PMCRAID_REQUEST_SENSE_TIMEOUT,
             pmcraid_timeout_handler);
}

static void pmcraid_cancel_all(struct pmcraid_cmd *cmd, u32 sense)
{
    struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
    struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
    struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
    void (*cmd_done) (struct pmcraid_cmd *) = sense ? pmcraid_erp_done
                            : pmcraid_request_sense;

    memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
    ioarcb->request_flags0 = SYNC_OVERRIDE;
    ioarcb->request_type = REQ_TYPE_IOACMD;
    ioarcb->cdb[0] = PMCRAID_CANCEL_ALL_REQUESTS;

    if (RES_IS_GSCSI(res->cfg_entry))
        ioarcb->cdb[1] = PMCRAID_SYNC_COMPLETE_AFTER_CANCEL;

    ioarcb->ioadl_bus_addr = 0;
    ioarcb->ioadl_length = 0;
    ioarcb->data_transfer_length = 0;
    ioarcb->ioarcb_bus_addr &= (~0x1FULL);

    /* writing to IOARRIN must be protected by host_lock, as mid-layer
     * schedule queuecommand while we are doing this
     */
    pmcraid_send_cmd(cmd, cmd_done,
             PMCRAID_REQUEST_SENSE_TIMEOUT,
             pmcraid_timeout_handler);
}

static void pmcraid_frame_auto_sense(struct pmcraid_cmd *cmd)
{
    u8 *sense_buf = cmd->scsi_cmd->sense_buffer;
    struct pmcraid_resource_entry *res = cmd->scsi_cmd->device->hostdata;
    struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
    u32 ioasc = le32_to_cpu(ioasa->ioasc);
    u32 failing_lba = 0;

    memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
    cmd->scsi_cmd->result = SAM_STAT_CHECK_CONDITION;

    if (RES_IS_VSET(res->cfg_entry) &&
        ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC &&
        ioasa->u.vset.failing_lba_hi != 0) {

        sense_buf[0] = 0x72;
        sense_buf[1] = PMCRAID_IOASC_SENSE_KEY(ioasc);
        sense_buf[2] = PMCRAID_IOASC_SENSE_CODE(ioasc);
        sense_buf[3] = PMCRAID_IOASC_SENSE_QUAL(ioasc);

        sense_buf[7] = 12;
        sense_buf[8] = 0;
        sense_buf[9] = 0x0A;
        sense_buf[10] = 0x80;

        failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_hi);

        sense_buf[12] = (failing_lba & 0xff000000) >> 24;
        sense_buf[13] = (failing_lba & 0x00ff0000) >> 16;
        sense_buf[14] = (failing_lba & 0x0000ff00) >> 8;
        sense_buf[15] = failing_lba & 0x000000ff;

        failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_lo);

        sense_buf[16] = (failing_lba & 0xff000000) >> 24;
        sense_buf[17] = (failing_lba & 0x00ff0000) >> 16;
        sense_buf[18] = (failing_lba & 0x0000ff00) >> 8;
        sense_buf[19] = failing_lba & 0x000000ff;
    } else {
        sense_buf[0] = 0x70;
        sense_buf[2] = PMCRAID_IOASC_SENSE_KEY(ioasc);
        sense_buf[12] = PMCRAID_IOASC_SENSE_CODE(ioasc);
        sense_buf[13] = PMCRAID_IOASC_SENSE_QUAL(ioasc);

        if (ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC) {
            if (RES_IS_VSET(res->cfg_entry))
                failing_lba =
                    le32_to_cpu(ioasa->u.
                         vset.failing_lba_lo);
            sense_buf[0] |= 0x80;
            sense_buf[3] = (failing_lba >> 24) & 0xff;
            sense_buf[4] = (failing_lba >> 16) & 0xff;
            sense_buf[5] = (failing_lba >> 8) & 0xff;
            sense_buf[6] = failing_lba & 0xff;
        }

        sense_buf[7] = 6; /* additional length */
    }
}

static int pmcraid_error_handler(struct pmcraid_cmd *cmd)
{
    struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
    struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
    struct pmcraid_instance *pinstance = cmd->drv_inst;
    struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
    u32 ioasc = le32_to_cpu(ioasa->ioasc);
    u32 masked_ioasc = ioasc & PMCRAID_IOASC_SENSE_MASK;
    u32 sense_copied = 0;

    if (!res) {
        pmcraid_info("resource pointer is NULL\n");
        return 0;
    }

    /* If this was a SCSI read/write command keep count of errors */
    if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_READ_CMD)
        atomic_inc(&res->read_failures);
    else if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_WRITE_CMD)
        atomic_inc(&res->write_failures);

    if (!RES_IS_GSCSI(res->cfg_entry) &&
        masked_ioasc != PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR) {
        pmcraid_frame_auto_sense(cmd);
    }

    /* Log IOASC/IOASA information based on user settings */
    pmcraid_ioasc_logger(ioasc, cmd);

    switch (masked_ioasc) {

    case PMCRAID_IOASC_AC_TERMINATED_BY_HOST:
        scsi_cmd->result |= (DID_ABORT << 16);
        break;

    case PMCRAID_IOASC_IR_INVALID_RESOURCE_HANDLE:
    case PMCRAID_IOASC_HW_CANNOT_COMMUNICATE:
        scsi_cmd->result |= (DID_NO_CONNECT << 16);
        break;

    case PMCRAID_IOASC_NR_SYNC_REQUIRED:
        res->sync_reqd = 1;
        scsi_cmd->result |= (DID_IMM_RETRY << 16);
        break;

    case PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC:
        scsi_cmd->result |= (DID_PASSTHROUGH << 16);
        break;

    case PMCRAID_IOASC_UA_BUS_WAS_RESET:
    case PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER:
        if (!res->reset_progress)
            scsi_report_bus_reset(pinstance->host,
                          scsi_cmd->device->channel);
        scsi_cmd->result |= (DID_ERROR << 16);
        break;

    case PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR:
        scsi_cmd->result |= PMCRAID_IOASC_SENSE_STATUS(ioasc);
        res->sync_reqd = 1;

        /* if check_condition is not active return with error otherwise
         * get/frame the sense buffer
         */
        if (PMCRAID_IOASC_SENSE_STATUS(ioasc) !=
            SAM_STAT_CHECK_CONDITION &&
            PMCRAID_IOASC_SENSE_STATUS(ioasc) != SAM_STAT_ACA_ACTIVE)
            return 0;

        /* If we have auto sense data as part of IOASA pass it to
         * mid-layer
         */
        if (ioasa->auto_sense_length != 0) {
            short sense_len = ioasa->auto_sense_length;
            int data_size = min_t(u16, le16_to_cpu(sense_len),
                          SCSI_SENSE_BUFFERSIZE);

            memcpy(scsi_cmd->sense_buffer,
                   ioasa->sense_data,
                   data_size);
            sense_copied = 1;
        }

        if (RES_IS_GSCSI(res->cfg_entry))
            pmcraid_cancel_all(cmd, sense_copied);
        else if (sense_copied)
            pmcraid_erp_done(cmd);
        else
            pmcraid_request_sense(cmd);

        return 1;

    case PMCRAID_IOASC_NR_INIT_CMD_REQUIRED:
        break;

    default:
        if (PMCRAID_IOASC_SENSE_KEY(ioasc) > RECOVERED_ERROR)
            scsi_cmd->result |= (DID_ERROR << 16);
        break;
    }
    return 0;
}

static int pmcraid_reset_device(
    struct scsi_cmnd *scsi_cmd,
    unsigned long timeout,
    u8 modifier
)
{
    struct pmcraid_cmd *cmd;
    struct pmcraid_instance *pinstance;
    struct pmcraid_resource_entry *res;
    struct pmcraid_ioarcb *ioarcb;
    unsigned long lock_flags;
    u32 ioasc;

    pinstance =
        (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
    res = scsi_cmd->device->hostdata;

    if (!res) {
        sdev_printk(KERN_ERR, scsi_cmd->device,
                "reset_device: NULL resource pointer\n");
        return FAILED;
    }

    /* If adapter is currently going through reset/reload, return failed.
     * This will force the mid-layer to call _eh_bus/host reset, which
     * will then go to sleep and wait for the reset to complete
     */
    spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
    if (pinstance->ioa_reset_in_progress ||
        pinstance->ioa_state == IOA_STATE_DEAD) {
        spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
        return FAILED;
    }

    res->reset_progress = 1;
    pmcraid_info("Resetting %s resource with addr %x\n",
             ((modifier & RESET_DEVICE_LUN) ? "LUN" :
             ((modifier & RESET_DEVICE_TARGET) ? "TARGET" : "BUS")),
             le32_to_cpu(res->cfg_entry.resource_address));

    /* get a free cmd block */
    cmd = pmcraid_get_free_cmd(pinstance);

    if (cmd == NULL) {
        spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
        pmcraid_err("%s: no cmd blocks are available\n", __func__);
        return FAILED;
    }

    ioarcb = &cmd->ioa_cb->ioarcb;
    ioarcb->resource_handle = res->cfg_entry.resource_handle;
    ioarcb->request_type = REQ_TYPE_IOACMD;
    ioarcb->cdb[0] = PMCRAID_RESET_DEVICE;

    /* Initialize reset modifier bits */
    if (modifier)
        modifier = ENABLE_RESET_MODIFIER | modifier;

    ioarcb->cdb[1] = modifier;

    init_completion(&cmd->wait_for_completion);
    cmd->completion_req = 1;

    pmcraid_info("cmd(CDB[0] = %x) for %x with index = %d\n",
             cmd->ioa_cb->ioarcb.cdb[0],
             le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle),
             le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2);

    pmcraid_send_cmd(cmd,
             pmcraid_internal_done,
             timeout,
             pmcraid_timeout_handler);

    spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);

    /* RESET_DEVICE command completes after all pending IOARCBs are
     * completed. Once this command is completed, pmcraind_internal_done
     * will wake up the 'completion' queue.
     */
    wait_for_completion(&cmd->wait_for_completion);

    /* complete the command here itself and return the command block
     * to free list
     */
    pmcraid_return_cmd(cmd);
    res->reset_progress = 0;
    ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);

    /* set the return value based on the returned ioasc */
    return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
}

static int _pmcraid_io_done(struct pmcraid_cmd *cmd, int reslen, int ioasc)
{
    struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
    int rc = 0;

    scsi_set_resid(scsi_cmd, reslen);

    pmcraid_info("response(%d) CDB[0] = %x ioasc:result: %x:%x\n",
        le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
        cmd->ioa_cb->ioarcb.cdb[0],
        ioasc, scsi_cmd->result);

    if (PMCRAID_IOASC_SENSE_KEY(ioasc) != 0)
        rc = pmcraid_error_handler(cmd);

    if (rc == 0) {
        scsi_dma_unmap(scsi_cmd);
        scsi_cmd->scsi_done(scsi_cmd);
    }

    return rc;
}

static void pmcraid_io_done(struct pmcraid_cmd *cmd)
{
    u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
    u32 reslen = le32_to_cpu(cmd->ioa_cb->ioasa.residual_data_length);

    if (_pmcraid_io_done(cmd, reslen, ioasc) == 0)
        pmcraid_return_cmd(cmd);
}

static struct pmcraid_cmd *pmcraid_abort_cmd(struct pmcraid_cmd *cmd)
{
    struct pmcraid_cmd *cancel_cmd;
    struct pmcraid_instance *pinstance;
    struct pmcraid_resource_entry *res;

    pinstance = (struct pmcraid_instance *)cmd->drv_inst;
    res = cmd->scsi_cmd->device->hostdata;

    cancel_cmd = pmcraid_get_free_cmd(pinstance);

    if (cancel_cmd == NULL) {
        pmcraid_err("%s: no cmd blocks are available\n", __func__);
        return NULL;
    }

    pmcraid_prepare_cancel_cmd(cancel_cmd, cmd);

    pmcraid_info("aborting command CDB[0]= %x with index = %d\n",
        cmd->ioa_cb->ioarcb.cdb[0],
        cmd->ioa_cb->ioarcb.response_handle >> 2);

    init_completion(&cancel_cmd->wait_for_completion);
    cancel_cmd->completion_req = 1;

    pmcraid_info("command (%d) CDB[0] = %x for %x\n",
        le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.response_handle) >> 2,
        cancel_cmd->ioa_cb->ioarcb.cdb[0],
        le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.resource_handle));

    pmcraid_send_cmd(cancel_cmd,
             pmcraid_internal_done,
             PMCRAID_INTERNAL_TIMEOUT,
             pmcraid_timeout_handler);
    return cancel_cmd;
}

static int pmcraid_abort_complete(struct pmcraid_cmd *cancel_cmd)
{
    struct pmcraid_resource_entry *res;
    u32 ioasc;

    wait_for_completion(&cancel_cmd->wait_for_completion);
    res = cancel_cmd->res;
    cancel_cmd->res = NULL;
    ioasc = le32_to_cpu(cancel_cmd->ioa_cb->ioasa.ioasc);

    /* If the abort task is not timed out we will get a Good completion
     * as sense_key, otherwise we may get one the following responses
     * due to subsequent bus reset or device reset. In case IOASC is
     * NR_SYNC_REQUIRED, set sync_reqd flag for the corresponding resource
     */
    if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
        ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED) {
        if (ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED)
            res->sync_reqd = 1;
        ioasc = 0;
    }

    /* complete the command here itself */
    pmcraid_return_cmd(cancel_cmd);
    return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
}

static int pmcraid_eh_abort_handler(struct scsi_cmnd *scsi_cmd)
{
    struct pmcraid_instance *pinstance;
    struct pmcraid_cmd *cmd;
    struct pmcraid_resource_entry *res;
    unsigned long host_lock_flags;
    unsigned long pending_lock_flags;
    struct pmcraid_cmd *cancel_cmd = NULL;
    int cmd_found = 0;
    int rc = FAILED;

    pinstance =
        (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;

    scmd_printk(KERN_INFO, scsi_cmd,
            "I/O command timed out, aborting it.\n");

    res = scsi_cmd->device->hostdata;

    if (res == NULL)
        return rc;

    /* If we are currently going through reset/reload, return failed.
     * This will force the mid-layer to eventually call
     * pmcraid_eh_host_reset which will then go to sleep and wait for the
     * reset to complete
     */
    spin_lock_irqsave(pinstance->host->host_lock, host_lock_flags);

    if (pinstance->ioa_reset_in_progress ||
        pinstance->ioa_state == IOA_STATE_DEAD) {
        spin_unlock_irqrestore(pinstance->host->host_lock,
                       host_lock_flags);
        return rc;
    }

    /* loop over pending cmd list to find cmd corresponding to this
     * scsi_cmd. Note that this command might not have been completed
     * already. locking: all pending commands are protected with
     * pending_pool_lock.
     */
    spin_lock_irqsave(&pinstance->pending_pool_lock, pending_lock_flags);
    list_for_each_entry(cmd, &pinstance->pending_cmd_pool, free_list) {

        if (cmd->scsi_cmd == scsi_cmd) {
            cmd_found = 1;
            break;
        }
    }

    spin_unlock_irqrestore(&pinstance->pending_pool_lock,
                pending_lock_flags);

    /* If the command to be aborted was given to IOA and still pending with
     * it, send ABORT_TASK to abort this and wait for its completion
     */
    if (cmd_found)
        cancel_cmd = pmcraid_abort_cmd(cmd);

    spin_unlock_irqrestore(pinstance->host->host_lock,
                   host_lock_flags);

    if (cancel_cmd) {
        cancel_cmd->res = cmd->scsi_cmd->device->hostdata;
        rc = pmcraid_abort_complete(cancel_cmd);
    }

    return cmd_found ? rc : SUCCESS;
}

static int pmcraid_eh_device_reset_handler(struct scsi_cmnd *scmd)
{
    scmd_printk(KERN_INFO, scmd,
            "resetting device due to an I/O command timeout.\n");
    return pmcraid_reset_device(scmd,
                    PMCRAID_INTERNAL_TIMEOUT,
                    RESET_DEVICE_LUN);
}

static int pmcraid_eh_bus_reset_handler(struct scsi_cmnd *scmd)
{
    scmd_printk(KERN_INFO, scmd,
            "Doing bus reset due to an I/O command timeout.\n");
    return pmcraid_reset_device(scmd,
                    PMCRAID_RESET_BUS_TIMEOUT,
                    RESET_DEVICE_BUS);
}

static int pmcraid_eh_target_reset_handler(struct scsi_cmnd *scmd)
{
    scmd_printk(KERN_INFO, scmd,
            "Doing target reset due to an I/O command timeout.\n");
    return pmcraid_reset_device(scmd,
                    PMCRAID_INTERNAL_TIMEOUT,
                    RESET_DEVICE_TARGET);
}

static int pmcraid_eh_host_reset_handler(struct scsi_cmnd *scmd)
{
    unsigned long interval = 10000; /* 10 seconds interval */
    int waits = jiffies_to_msecs(PMCRAID_RESET_HOST_TIMEOUT) / interval;
    struct pmcraid_instance *pinstance =
        (struct pmcraid_instance *)(scmd->device->host->hostdata);


    /* wait for an additional 150 seconds just in case firmware could come
     * up and if it could complete all the pending commands excluding the
     * two HCAM (CCN and LDN).
     */
    while (waits--) {
        if (atomic_read(&pinstance->outstanding_cmds) <=
            PMCRAID_MAX_HCAM_CMD)
            return SUCCESS;
        msleep(interval);
    }

    dev_err(&pinstance->pdev->dev,
        "Adapter being reset due to an I/O command timeout.\n");
    return pmcraid_reset_bringup(pinstance) == 0 ? SUCCESS : FAILED;
}

static u8 pmcraid_task_attributes(struct scsi_cmnd *scsi_cmd)
{
    char tag[2];
    u8 rc = 0;

    if (scsi_populate_tag_msg(scsi_cmd, tag)) {
        switch (tag[0]) {
        case MSG_SIMPLE_TAG:
            rc = TASK_TAG_SIMPLE;
            break;
        case MSG_HEAD_TAG:
            rc = TASK_TAG_QUEUE_HEAD;
            break;
        case MSG_ORDERED_TAG:
            rc = TASK_TAG_ORDERED;
            break;
        };
    }

    return rc;
}


struct pmcraid_ioadl_desc *
pmcraid_init_ioadls(struct pmcraid_cmd *cmd, int sgcount)
{
    struct pmcraid_ioadl_desc *ioadl;
    struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
    int ioadl_count = 0;

    if (ioarcb->add_cmd_param_length)
        ioadl_count = DIV_ROUND_UP(ioarcb->add_cmd_param_length, 16);
    ioarcb->ioadl_length =
        sizeof(struct pmcraid_ioadl_desc) * sgcount;

    if ((sgcount + ioadl_count) > (ARRAY_SIZE(ioarcb->add_data.u.ioadl))) {
        /* external ioadls start at offset 0x80 from control_block
         * structure, re-using 24 out of 27 ioadls part of IOARCB.
         * It is necessary to indicate to firmware that driver is
         * using ioadls to be treated as external to IOARCB.
         */
        ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
        ioarcb->ioadl_bus_addr =
            cpu_to_le64((cmd->ioa_cb_bus_addr) +
                offsetof(struct pmcraid_ioarcb,
                    add_data.u.ioadl[3]));
        ioadl = &ioarcb->add_data.u.ioadl[3];
    } else {
        ioarcb->ioadl_bus_addr =
            cpu_to_le64((cmd->ioa_cb_bus_addr) +
                offsetof(struct pmcraid_ioarcb,
                    add_data.u.ioadl[ioadl_count]));

        ioadl = &ioarcb->add_data.u.ioadl[ioadl_count];
        ioarcb->ioarcb_bus_addr |=
                DIV_ROUND_CLOSEST(sgcount + ioadl_count, 8);
    }

    return ioadl;
}

static int pmcraid_build_ioadl(
    struct pmcraid_instance *pinstance,
    struct pmcraid_cmd *cmd
)
{
    int i, nseg;
    struct scatterlist *sglist;

    struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
    struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
    struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;

    u32 length = scsi_bufflen(scsi_cmd);

    if (!length)
        return 0;

    nseg = scsi_dma_map(scsi_cmd);

    if (nseg < 0) {
        scmd_printk(KERN_ERR, scsi_cmd, "scsi_map_dma failed!\n");
        return -1;
    } else if (nseg > PMCRAID_MAX_IOADLS) {
        scsi_dma_unmap(scsi_cmd);
        scmd_printk(KERN_ERR, scsi_cmd,
            "sg count is (%d) more than allowed!\n", nseg);
        return -1;
    }

    /* Initialize IOARCB data transfer length fields */
    if (scsi_cmd->sc_data_direction == DMA_TO_DEVICE)
        ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;

    ioarcb->request_flags0 |= NO_LINK_DESCS;
    ioarcb->data_transfer_length = cpu_to_le32(length);
    ioadl = pmcraid_init_ioadls(cmd, nseg);

    /* Initialize IOADL descriptor addresses */
    scsi_for_each_sg(scsi_cmd, sglist, nseg, i) {
        ioadl[i].data_len = cpu_to_le32(sg_dma_len(sglist));
        ioadl[i].address = cpu_to_le64(sg_dma_address(sglist));
        ioadl[i].flags = 0;
    }
    /* setup last descriptor */
    ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;

    return 0;
}

static void pmcraid_free_sglist(struct pmcraid_sglist *sglist)
{
    int i;

    for (i = 0; i < sglist->num_sg; i++)
        __free_pages(sg_page(&(sglist->scatterlist[i])),
                 sglist->order);

    kfree(sglist);
}

static struct pmcraid_sglist *pmcraid_alloc_sglist(int buflen)
{
    struct pmcraid_sglist *sglist;
    struct scatterlist *scatterlist;
    struct page *page;
    int num_elem, i, j;
    int sg_size;
    int order;
    int bsize_elem;

    sg_size = buflen / (PMCRAID_MAX_IOADLS - 1);
    order = (sg_size > 0) ? get_order(sg_size) : 0;
    bsize_elem = PAGE_SIZE * (1 << order);

    /* Determine the actual number of sg entries needed */
    if (buflen % bsize_elem)
        num_elem = (buflen / bsize_elem) + 1;
    else
        num_elem = buflen / bsize_elem;

    /* Allocate a scatter/gather list for the DMA */
    sglist = kzalloc(sizeof(struct pmcraid_sglist) +
             (sizeof(struct scatterlist) * (num_elem - 1)),
             GFP_KERNEL);

    if (sglist == NULL)
        return NULL;

    scatterlist = sglist->scatterlist;
    sg_init_table(scatterlist, num_elem);
    sglist->order = order;
    sglist->num_sg = num_elem;
    sg_size = buflen;

    for (i = 0; i < num_elem; i++) {
        page = alloc_pages(GFP_KERNEL|GFP_DMA|__GFP_ZERO, order);
        if (!page) {
            for (j = i - 1; j >= 0; j--)
                __free_pages(sg_page(&scatterlist[j]), order);
            kfree(sglist);
            return NULL;
        }

        sg_set_page(&scatterlist[i], page,
            sg_size < bsize_elem ? sg_size : bsize_elem, 0);
        sg_size -= bsize_elem;
    }

    return sglist;
}

static int pmcraid_copy_sglist(
    struct pmcraid_sglist *sglist,
    unsigned long buffer,
    u32 len,
    int direction
)
{
    struct scatterlist *scatterlist;
    void *kaddr;
    int bsize_elem;
    int i;
    int rc = 0;

    /* Determine the actual number of bytes per element */
    bsize_elem = PAGE_SIZE * (1 << sglist->order);

    scatterlist = sglist->scatterlist;

    for (i = 0; i < (len / bsize_elem); i++, buffer += bsize_elem) {
        struct page *page = sg_page(&scatterlist[i]);

        kaddr = kmap(page);
        if (direction == DMA_TO_DEVICE)
            rc = __copy_from_user(kaddr,
                          (void *)buffer,
                          bsize_elem);
        else
            rc = __copy_to_user((void *)buffer, kaddr, bsize_elem);

        kunmap(page);

        if (rc) {
            pmcraid_err("failed to copy user data into sg list\n");
            return -EFAULT;
        }

        scatterlist[i].length = bsize_elem;
    }

    if (len % bsize_elem) {
        struct page *page = sg_page(&scatterlist[i]);

        kaddr = kmap(page);

        if (direction == DMA_TO_DEVICE)
            rc = __copy_from_user(kaddr,
                          (void *)buffer,
                          len % bsize_elem);
        else
            rc = __copy_to_user((void *)buffer,
                        kaddr,
                        len % bsize_elem);

        kunmap(page);

        scatterlist[i].length = len % bsize_elem;
    }

    if (rc) {
        pmcraid_err("failed to copy user data into sg list\n");
        rc = -EFAULT;
    }

    return rc;
}

static int pmcraid_queuecommand_lck(
    struct scsi_cmnd *scsi_cmd,
    void (*done) (struct scsi_cmnd *)
)
{
    struct pmcraid_instance *pinstance;
    struct pmcraid_resource_entry *res;
    struct pmcraid_ioarcb *ioarcb;
    struct pmcraid_cmd *cmd;
    u32 fw_version;
    int rc = 0;

    pinstance =
        (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
    fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
    scsi_cmd->scsi_done = done;
    res = scsi_cmd->device->hostdata;
    scsi_cmd->result = (DID_OK << 16);

    /* if adapter is marked as dead, set result to DID_NO_CONNECT complete
     * the command
     */
    if (pinstance->ioa_state == IOA_STATE_DEAD) {
        pmcraid_info("IOA is dead, but queuecommand is scheduled\n");
        scsi_cmd->result = (DID_NO_CONNECT << 16);
        scsi_cmd->scsi_done(scsi_cmd);
        return 0;
    }

    /* If IOA reset is in progress, can't queue the commands */
    if (pinstance->ioa_reset_in_progress)
        return SCSI_MLQUEUE_HOST_BUSY;

    /* Firmware doesn't support SYNCHRONIZE_CACHE command (0x35), complete
     * the command here itself with success return
     */
    if (scsi_cmd->cmnd[0] == SYNCHRONIZE_CACHE) {
        pmcraid_info("SYNC_CACHE(0x35), completing in driver itself\n");
        scsi_cmd->scsi_done(scsi_cmd);
        return 0;
    }

    /* initialize the command and IOARCB to be sent to IOA */
    cmd = pmcraid_get_free_cmd(pinstance);

    if (cmd == NULL) {
        pmcraid_err("free command block is not available\n");
        return SCSI_MLQUEUE_HOST_BUSY;
    }

    cmd->scsi_cmd = scsi_cmd;
    ioarcb = &(cmd->ioa_cb->ioarcb);
    memcpy(ioarcb->cdb, scsi_cmd->cmnd, scsi_cmd->cmd_len);
    ioarcb->resource_handle = res->cfg_entry.resource_handle;
    ioarcb->request_type = REQ_TYPE_SCSI;

    /* set hrrq number where the IOA should respond to. Note that all cmds
     * generated internally uses hrrq_id 0, exception to this is the cmd
     * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
     * hrrq_id assigned here in queuecommand
     */
    ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
              pinstance->num_hrrq;
    cmd->cmd_done = pmcraid_io_done;

    if (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry)) {
        if (scsi_cmd->underflow == 0)
            ioarcb->request_flags0 |= INHIBIT_UL_CHECK;

        if (res->sync_reqd) {
            ioarcb->request_flags0 |= SYNC_COMPLETE;
            res->sync_reqd = 0;
        }

        ioarcb->request_flags0 |= NO_LINK_DESCS;
        ioarcb->request_flags1 |= pmcraid_task_attributes(scsi_cmd);

        if (RES_IS_GSCSI(res->cfg_entry))
            ioarcb->request_flags1 |= DELAY_AFTER_RESET;
    }

    rc = pmcraid_build_ioadl(pinstance, cmd);

    pmcraid_info("command (%d) CDB[0] = %x for %x:%x:%x:%x\n",
             le32_to_cpu(ioarcb->response_handle) >> 2,
             scsi_cmd->cmnd[0], pinstance->host->unique_id,
             RES_IS_VSET(res->cfg_entry) ? PMCRAID_VSET_BUS_ID :
            PMCRAID_PHYS_BUS_ID,
             RES_IS_VSET(res->cfg_entry) ?
            (fw_version <= PMCRAID_FW_VERSION_1 ?
                res->cfg_entry.unique_flags1 :
                    res->cfg_entry.array_id & 0xFF) :
            RES_TARGET(res->cfg_entry.resource_address),
             RES_LUN(res->cfg_entry.resource_address));

    if (likely(rc == 0)) {
        _pmcraid_fire_command(cmd);
    } else {
        pmcraid_err("queuecommand could not build ioadl\n");
        pmcraid_return_cmd(cmd);
        rc = SCSI_MLQUEUE_HOST_BUSY;
    }

    return rc;
}

static DEF_SCSI_QCMD(pmcraid_queuecommand)


static int pmcraid_chr_open(struct inode *inode, struct file *filep)
{
    struct pmcraid_instance *pinstance;

    if (!capable(CAP_SYS_ADMIN))
        return -EACCES;

    /* Populate adapter instance * pointer for use by ioctl */
    pinstance = container_of(inode->i_cdev, struct pmcraid_instance, cdev);
    filep->private_data = pinstance;

    return 0;
}

static int pmcraid_chr_release(struct inode *inode, struct file *filep)
{
    struct pmcraid_instance *pinstance = filep->private_data;

    filep->private_data = NULL;
    fasync_helper(-1, filep, 0, &pinstance->aen_queue);

    return 0;
}

static int pmcraid_chr_fasync(int fd, struct file *filep, int mode)
{
    struct pmcraid_instance *pinstance;
    int rc;

    pinstance = filep->private_data;
    mutex_lock(&pinstance->aen_queue_lock);
    rc = fasync_helper(fd, filep, mode, &pinstance->aen_queue);
    mutex_unlock(&pinstance->aen_queue_lock);

    return rc;
}


static int pmcraid_build_passthrough_ioadls(
    struct pmcraid_cmd *cmd,
    int buflen,
    int direction
)
{
    struct pmcraid_sglist *sglist = NULL;
    struct scatterlist *sg = NULL;
    struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
    struct pmcraid_ioadl_desc *ioadl;
    int i;

    sglist = pmcraid_alloc_sglist(buflen);

    if (!sglist) {
        pmcraid_err("can't allocate memory for passthrough SGls\n");
        return -ENOMEM;
    }

    sglist->num_dma_sg = pci_map_sg(cmd->drv_inst->pdev,
                    sglist->scatterlist,
                    sglist->num_sg, direction);

    if (!sglist->num_dma_sg || sglist->num_dma_sg > PMCRAID_MAX_IOADLS) {
        dev_err(&cmd->drv_inst->pdev->dev,
            "Failed to map passthrough buffer!\n");
        pmcraid_free_sglist(sglist);
        return -EIO;
    }

    cmd->sglist = sglist;
    ioarcb->request_flags0 |= NO_LINK_DESCS;

    ioadl = pmcraid_init_ioadls(cmd, sglist->num_dma_sg);

    /* Initialize IOADL descriptor addresses */
    for_each_sg(sglist->scatterlist, sg, sglist->num_dma_sg, i) {
        ioadl[i].data_len = cpu_to_le32(sg_dma_len(sg));
        ioadl[i].address = cpu_to_le64(sg_dma_address(sg));
        ioadl[i].flags = 0;
    }

    /* setup the last descriptor */
    ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;

    return 0;
}


static void pmcraid_release_passthrough_ioadls(
    struct pmcraid_cmd *cmd,
    int buflen,
    int direction
)
{
    struct pmcraid_sglist *sglist = cmd->sglist;

    if (buflen > 0) {
        pci_unmap_sg(cmd->drv_inst->pdev,
                 sglist->scatterlist,
                 sglist->num_sg,
                 direction);
        pmcraid_free_sglist(sglist);
        cmd->sglist = NULL;
    }
}

static long pmcraid_ioctl_passthrough(
    struct pmcraid_instance *pinstance,
    unsigned int ioctl_cmd,
    unsigned int buflen,
    unsigned long arg
)
{
    struct pmcraid_passthrough_ioctl_buffer *buffer;
    struct pmcraid_ioarcb *ioarcb;
    struct pmcraid_cmd *cmd;
    struct pmcraid_cmd *cancel_cmd;
    unsigned long request_buffer;
    unsigned long request_offset;
    unsigned long lock_flags;
    void *ioasa;
    u32 ioasc;
    int request_size;
    int buffer_size;
    u8 access, direction;
    int rc = 0;

    /* If IOA reset is in progress, wait 10 secs for reset to complete */
    if (pinstance->ioa_reset_in_progress) {
        rc = wait_event_interruptible_timeout(
                pinstance->reset_wait_q,
                !pinstance->ioa_reset_in_progress,
                msecs_to_jiffies(10000));

        if (!rc)
            return -ETIMEDOUT;
        else if (rc < 0)
            return -ERESTARTSYS;
    }

    /* If adapter is not in operational state, return error */
    if (pinstance->ioa_state != IOA_STATE_OPERATIONAL) {
        pmcraid_err("IOA is not operational\n");
        return -ENOTTY;
    }

    buffer_size = sizeof(struct pmcraid_passthrough_ioctl_buffer);
    buffer = kmalloc(buffer_size, GFP_KERNEL);

    if (!buffer) {
        pmcraid_err("no memory for passthrough buffer\n");
        return -ENOMEM;
    }

    request_offset =
        offsetof(struct pmcraid_passthrough_ioctl_buffer, request_buffer);

    request_buffer = arg + request_offset;

    rc = __copy_from_user(buffer,
                 (struct pmcraid_passthrough_ioctl_buffer *) arg,
                 sizeof(struct pmcraid_passthrough_ioctl_buffer));

    ioasa =
    (void *)(arg +
        offsetof(struct pmcraid_passthrough_ioctl_buffer, ioasa));

    if (rc) {
        pmcraid_err("ioctl: can't copy passthrough buffer\n");
        rc = -EFAULT;
        goto out_free_buffer;
    }

    request_size = buffer->ioarcb.data_transfer_length;

    if (buffer->ioarcb.request_flags0 & TRANSFER_DIR_WRITE) {
        access = VERIFY_READ;
        direction = DMA_TO_DEVICE;
    } else {
        access = VERIFY_WRITE;
        direction = DMA_FROM_DEVICE;
    }

    if (request_size > 0) {
        rc = access_ok(access, arg, request_offset + request_size);

        if (!rc) {
            rc = -EFAULT;
            goto out_free_buffer;
        }
    } else if (request_size < 0) {
        rc = -EINVAL;
        goto out_free_buffer;
    }

    /* check if we have any additional command parameters */
    if (buffer->ioarcb.add_cmd_param_length > PMCRAID_ADD_CMD_PARAM_LEN) {
        rc = -EINVAL;
        goto out_free_buffer;
    }

    cmd = pmcraid_get_free_cmd(pinstance);

    if (!cmd) {
        pmcraid_err("free command block is not available\n");
        rc = -ENOMEM;
        goto out_free_buffer;
    }

    cmd->scsi_cmd = NULL;
    ioarcb = &(cmd->ioa_cb->ioarcb);

    /* Copy the user-provided IOARCB stuff field by field */
    ioarcb->resource_handle = buffer->ioarcb.resource_handle;
    ioarcb->data_transfer_length = buffer->ioarcb.data_transfer_length;
    ioarcb->cmd_timeout = buffer->ioarcb.cmd_timeout;
    ioarcb->request_type = buffer->ioarcb.request_type;
    ioarcb->request_flags0 = buffer->ioarcb.request_flags0;
    ioarcb->request_flags1 = buffer->ioarcb.request_flags1;
    memcpy(ioarcb->cdb, buffer->ioarcb.cdb, PMCRAID_MAX_CDB_LEN);

    if (buffer->ioarcb.add_cmd_param_length) {
        ioarcb->add_cmd_param_length =
            buffer->ioarcb.add_cmd_param_length;
        ioarcb->add_cmd_param_offset =
            buffer->ioarcb.add_cmd_param_offset;
        memcpy(ioarcb->add_data.u.add_cmd_params,
            buffer->ioarcb.add_data.u.add_cmd_params,
            buffer->ioarcb.add_cmd_param_length);
    }

    /* set hrrq number where the IOA should respond to. Note that all cmds
     * generated internally uses hrrq_id 0, exception to this is the cmd
     * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
     * hrrq_id assigned here in queuecommand
     */
    ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
              pinstance->num_hrrq;

    if (request_size) {
        rc = pmcraid_build_passthrough_ioadls(cmd,
                              request_size,
                              direction);
        if (rc) {
            pmcraid_err("couldn't build passthrough ioadls\n");
            goto out_free_buffer;
        }
    } else if (request_size < 0) {
        rc = -EINVAL;
        goto out_free_buffer;
    }

    /* If data is being written into the device, copy the data from user
     * buffers
     */
    if (direction == DMA_TO_DEVICE && request_size > 0) {
        rc = pmcraid_copy_sglist(cmd->sglist,
                     request_buffer,
                     request_size,
                     direction);
        if (rc) {
            pmcraid_err("failed to copy user buffer\n");
            goto out_free_sglist;
        }
    }

    /* passthrough ioctl is a blocking command so, put the user to sleep
     * until timeout. Note that a timeout value of 0 means, do timeout.
     */
    cmd->cmd_done = pmcraid_internal_done;
    init_completion(&cmd->wait_for_completion);
    cmd->completion_req = 1;

    pmcraid_info("command(%d) (CDB[0] = %x) for %x\n",
             le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
             cmd->ioa_cb->ioarcb.cdb[0],
             le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle));

    spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
    _pmcraid_fire_command(cmd);
    spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);

    /* NOTE ! Remove the below line once abort_task is implemented
     * in firmware. This line disables ioctl command timeout handling logic
     * similar to IO command timeout handling, making ioctl commands to wait
     * until the command completion regardless of timeout value specified in
     * ioarcb
     */
    buffer->ioarcb.cmd_timeout = 0;

    /* If command timeout is specified put caller to wait till that time,
     * otherwise it would be blocking wait. If command gets timed out, it
     * will be aborted.
     */
    if (buffer->ioarcb.cmd_timeout == 0) {
        wait_for_completion(&cmd->wait_for_completion);
    } else if (!wait_for_completion_timeout(
            &cmd->wait_for_completion,
            msecs_to_jiffies(buffer->ioarcb.cmd_timeout * 1000))) {

        pmcraid_info("aborting cmd %d (CDB[0] = %x) due to timeout\n",
            le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle >> 2),
            cmd->ioa_cb->ioarcb.cdb[0]);

        spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
        cancel_cmd = pmcraid_abort_cmd(cmd);
        spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);

        if (cancel_cmd) {
            wait_for_completion(&cancel_cmd->wait_for_completion);
            ioasc = cancel_cmd->ioa_cb->ioasa.ioasc;
            pmcraid_return_cmd(cancel_cmd);

            /* if abort task couldn't find the command i.e it got
             * completed prior to aborting, return good completion.
             * if command got aborted successfully or there was IOA
             * reset due to abort task itself getting timedout then
             * return -ETIMEDOUT
             */
            if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
                PMCRAID_IOASC_SENSE_KEY(ioasc) == 0x00) {
                if (ioasc != PMCRAID_IOASC_GC_IOARCB_NOTFOUND)
                    rc = -ETIMEDOUT;
                goto out_handle_response;
            }
        }

        /* no command block for abort task or abort task failed to abort
         * the IOARCB, then wait for 150 more seconds and initiate reset
         * sequence after timeout
         */
        if (!wait_for_completion_timeout(
            &cmd->wait_for_completion,
            msecs_to_jiffies(150 * 1000))) {
            pmcraid_reset_bringup(cmd->drv_inst);
            rc = -ETIMEDOUT;
        }
    }

out_handle_response:
    /* copy entire IOASA buffer and return IOCTL success.
     * If copying IOASA to user-buffer fails, return
     * EFAULT
     */
    if (copy_to_user(ioasa, &cmd->ioa_cb->ioasa,
        sizeof(struct pmcraid_ioasa))) {
        pmcraid_err("failed to copy ioasa buffer to user\n");
        rc = -EFAULT;
    }

    /* If the data transfer was from device, copy the data onto user
     * buffers
     */
    else if (direction == DMA_FROM_DEVICE && request_size > 0) {
        rc = pmcraid_copy_sglist(cmd->sglist,
                     request_buffer,
                     request_size,
                     direction);
        if (rc) {
            pmcraid_err("failed to copy user buffer\n");
            rc = -EFAULT;
        }
    }

out_free_sglist:
    pmcraid_release_passthrough_ioadls(cmd, request_size, direction);
    pmcraid_return_cmd(cmd);

out_free_buffer:
    kfree(buffer);

    return rc;
}




static long pmcraid_ioctl_driver(
    struct pmcraid_instance *pinstance,
    unsigned int cmd,
    unsigned int buflen,
    void __user *user_buffer
)
{
    int rc = -ENOSYS;

    if (!access_ok(VERIFY_READ, user_buffer, _IOC_SIZE(cmd))) {
        pmcraid_err("ioctl_driver: access fault in request buffer\n");
        return -EFAULT;
    }

    switch (cmd) {
    case PMCRAID_IOCTL_RESET_ADAPTER:
        pmcraid_reset_bringup(pinstance);
        rc = 0;
        break;

    default:
        break;
    }

    return rc;
}

static int pmcraid_check_ioctl_buffer(
    int cmd,
    void __user *arg,
    struct pmcraid_ioctl_header *hdr
)
{
    int rc = 0;
    int access = VERIFY_READ;

    if (copy_from_user(hdr, arg, sizeof(struct pmcraid_ioctl_header))) {
        pmcraid_err("couldn't copy ioctl header from user buffer\n");
        return -EFAULT;
    }

    /* check for valid driver signature */
    rc = memcmp(hdr->signature,
            PMCRAID_IOCTL_SIGNATURE,
            sizeof(hdr->signature));
    if (rc) {
        pmcraid_err("signature verification failed\n");
        return -EINVAL;
    }

    /* check for appropriate buffer access */
    if ((_IOC_DIR(cmd) & _IOC_READ) == _IOC_READ)
        access = VERIFY_WRITE;

    rc = access_ok(access,
               (arg + sizeof(struct pmcraid_ioctl_header)),
               hdr->buffer_length);
    if (!rc) {
        pmcraid_err("access failed for user buffer of size %d\n",
                 hdr->buffer_length);
        return -EFAULT;
    }

    return 0;
}

static long pmcraid_chr_ioctl(
    struct file *filep,
    unsigned int cmd,
    unsigned long arg
)
{
    struct pmcraid_instance *pinstance = NULL;
    struct pmcraid_ioctl_header *hdr = NULL;
    int retval = -ENOTTY;

    hdr = kmalloc(sizeof(struct pmcraid_ioctl_header), GFP_KERNEL);

    if (!hdr) {
        pmcraid_err("failed to allocate memory for ioctl header\n");
        return -ENOMEM;
    }

    retval = pmcraid_check_ioctl_buffer(cmd, (void *)arg, hdr);

    if (retval) {
        pmcraid_info("chr_ioctl: header check failed\n");
        kfree(hdr);
        return retval;
    }

    pinstance = filep->private_data;

    if (!pinstance) {
        pmcraid_info("adapter instance is not found\n");
        kfree(hdr);
        return -ENOTTY;
    }

    switch (_IOC_TYPE(cmd)) {

    case PMCRAID_PASSTHROUGH_IOCTL:
        /* If ioctl code is to download microcode, we need to block
         * mid-layer requests.
         */
        if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
            scsi_block_requests(pinstance->host);

        retval = pmcraid_ioctl_passthrough(pinstance,
                           cmd,
                           hdr->buffer_length,
                           arg);

        if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
            scsi_unblock_requests(pinstance->host);
        break;

    case PMCRAID_DRIVER_IOCTL:
        arg += sizeof(struct pmcraid_ioctl_header);
        retval = pmcraid_ioctl_driver(pinstance,
                          cmd,
                          hdr->buffer_length,
                          (void __user *)arg);
        break;

    default:
        retval = -ENOTTY;
        break;
    }

    kfree(hdr);

    return retval;
}

static const struct file_operations pmcraid_fops = {
    .owner = THIS_MODULE,
    .open = pmcraid_chr_open,
    .release = pmcraid_chr_release,
    .fasync = pmcraid_chr_fasync,
    .unlocked_ioctl = pmcraid_chr_ioctl,
#ifdef CONFIG_COMPAT
    .compat_ioctl = pmcraid_chr_ioctl,
#endif
    .llseek = noop_llseek,
};




static ssize_t pmcraid_show_log_level(
    struct device *dev,
    struct device_attribute *attr,
    char *buf)
{
    struct Scsi_Host *shost = class_to_shost(dev);
    struct pmcraid_instance *pinstance =
        (struct pmcraid_instance *)shost->hostdata;
    return snprintf(buf, PAGE_SIZE, "%d\n", pinstance->current_log_level);
}

static ssize_t pmcraid_store_log_level(
    struct device *dev,
    struct device_attribute *attr,
    const char *buf,
    size_t count
)
{
    struct Scsi_Host *shost;
    struct pmcraid_instance *pinstance;
    unsigned long val;

    if (strict_strtoul(buf, 10, &val))
        return -EINVAL;
    /* log-level should be from 0 to 2 */
    if (val > 2)
        return -EINVAL;

    shost = class_to_shost(dev);
    pinstance = (struct pmcraid_instance *)shost->hostdata;
    pinstance->current_log_level = val;

    return strlen(buf);
}

static struct device_attribute pmcraid_log_level_attr = {
    .attr = {
         .name = "log_level",
         .mode = S_IRUGO | S_IWUSR,
         },
    .show = pmcraid_show_log_level,
    .store = pmcraid_store_log_level,
};

static ssize_t pmcraid_show_drv_version(
    struct device *dev,
    struct device_attribute *attr,
    char *buf
)
{
    return snprintf(buf, PAGE_SIZE, "version: %s\n",
            PMCRAID_DRIVER_VERSION);
}

static struct device_attribute pmcraid_driver_version_attr = {
    .attr = {
         .name = "drv_version",
         .mode = S_IRUGO,
         },
    .show = pmcraid_show_drv_version,
};

static ssize_t pmcraid_show_adapter_id(
    struct device *dev,
    struct device_attribute *attr,
    char *buf
)
{
    struct Scsi_Host *shost = class_to_shost(dev);
    struct pmcraid_instance *pinstance =
        (struct pmcraid_instance *)shost->hostdata;
    u32 adapter_id = (pinstance->pdev->bus->number << 8) |
        pinstance->pdev->devfn;
    u32 aen_group = pmcraid_event_family.id;

    return snprintf(buf, PAGE_SIZE,
            "adapter id: %d\nminor: %d\naen group: %d\n",
            adapter_id, MINOR(pinstance->cdev.dev), aen_group);
}

static struct device_attribute pmcraid_adapter_id_attr = {
    .attr = {
         .name = "adapter_id",
         .mode = S_IRUGO | S_IWUSR,
         },
    .show = pmcraid_show_adapter_id,
};

static struct device_attribute *pmcraid_host_attrs[] = {
    &pmcraid_log_level_attr,
    &pmcraid_driver_version_attr,
    &pmcraid_adapter_id_attr,
    NULL,
};


/* host template structure for pmcraid driver */
static struct scsi_host_template pmcraid_host_template = {
    .module = THIS_MODULE,
    .name = PMCRAID_DRIVER_NAME,
    .queuecommand = pmcraid_queuecommand,
    .eh_abort_handler = pmcraid_eh_abort_handler,
    .eh_bus_reset_handler = pmcraid_eh_bus_reset_handler,
    .eh_target_reset_handler = pmcraid_eh_target_reset_handler,
    .eh_device_reset_handler = pmcraid_eh_device_reset_handler,
    .eh_host_reset_handler = pmcraid_eh_host_reset_handler,

    .slave_alloc = pmcraid_slave_alloc,
    .slave_configure = pmcraid_slave_configure,
    .slave_destroy = pmcraid_slave_destroy,
    .change_queue_depth = pmcraid_change_queue_depth,
    .change_queue_type  = pmcraid_change_queue_type,
    .can_queue = PMCRAID_MAX_IO_CMD,
    .this_id = -1,
    .sg_tablesize = PMCRAID_MAX_IOADLS,
    .max_sectors = PMCRAID_IOA_MAX_SECTORS,
    .cmd_per_lun = PMCRAID_MAX_CMD_PER_LUN,
    .use_clustering = ENABLE_CLUSTERING,
    .shost_attrs = pmcraid_host_attrs,
    .proc_name = PMCRAID_DRIVER_NAME
};

/*
 * pmcraid_isr_msix - implements MSI-X interrupt handling routine
 * @irq: interrupt vector number
 * @dev_id: pointer hrrq_vector
 *
 * Return Value
 *   IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
 */

static irqreturn_t pmcraid_isr_msix(int irq, void *dev_id)
{
    struct pmcraid_isr_param *hrrq_vector;
    struct pmcraid_instance *pinstance;
    unsigned long lock_flags;
    u32 intrs_val;
    int hrrq_id;

    hrrq_vector = (struct pmcraid_isr_param *)dev_id;
    hrrq_id = hrrq_vector->hrrq_id;
    pinstance = hrrq_vector->drv_inst;

    if (!hrrq_id) {
        /* Read the interrupt */
        intrs_val = pmcraid_read_interrupts(pinstance);
        if (intrs_val &&
            ((ioread32(pinstance->int_regs.host_ioa_interrupt_reg)
            & DOORBELL_INTR_MSIX_CLR) == 0)) {
            /* Any error interrupts including unit_check,
             * initiate IOA reset.In case of unit check indicate
             * to reset_sequence that IOA unit checked and prepare
             * for a dump during reset sequence
             */
            if (intrs_val & PMCRAID_ERROR_INTERRUPTS) {
                if (intrs_val & INTRS_IOA_UNIT_CHECK)
                    pinstance->ioa_unit_check = 1;

                pmcraid_err("ISR: error interrupts: %x \
                    initiating reset\n", intrs_val);
                spin_lock_irqsave(pinstance->host->host_lock,
                    lock_flags);
                pmcraid_initiate_reset(pinstance);
                spin_unlock_irqrestore(
                    pinstance->host->host_lock,
                    lock_flags);
            }
            /* If interrupt was as part of the ioa initialization,
             * clear it. Delete the timer and wakeup the
             * reset engine to proceed with reset sequence
             */
            if (intrs_val & INTRS_TRANSITION_TO_OPERATIONAL)
                pmcraid_clr_trans_op(pinstance);

            /* Clear the interrupt register by writing
             * to host to ioa doorbell. Once done
             * FW will clear the interrupt.
             */
            iowrite32(DOORBELL_INTR_MSIX_CLR,
                pinstance->int_regs.host_ioa_interrupt_reg);
            ioread32(pinstance->int_regs.host_ioa_interrupt_reg);


        }
    }

    tasklet_schedule(&(pinstance->isr_tasklet[hrrq_id]));

    return IRQ_HANDLED;
}

static irqreturn_t pmcraid_isr(int irq, void *dev_id)
{
    struct pmcraid_isr_param *hrrq_vector;
    struct pmcraid_instance *pinstance;
    u32 intrs;
    unsigned long lock_flags;
    int hrrq_id = 0;

    /* In case of legacy interrupt mode where interrupts are shared across
     * isrs, it may be possible that the current interrupt is not from IOA
     */
    if (!dev_id) {
        printk(KERN_INFO "%s(): NULL host pointer\n", __func__);
        return IRQ_NONE;
    }
    hrrq_vector = (struct pmcraid_isr_param *)dev_id;
    pinstance = hrrq_vector->drv_inst;

    intrs = pmcraid_read_interrupts(pinstance);

    if (unlikely((intrs & PMCRAID_PCI_INTERRUPTS) == 0))
        return IRQ_NONE;

    /* Any error interrupts including unit_check, initiate IOA reset.
     * In case of unit check indicate to reset_sequence that IOA unit
     * checked and prepare for a dump during reset sequence
     */
    if (intrs & PMCRAID_ERROR_INTERRUPTS) {

        if (intrs & INTRS_IOA_UNIT_CHECK)
            pinstance->ioa_unit_check = 1;

        iowrite32(intrs,
              pinstance->int_regs.ioa_host_interrupt_clr_reg);
        pmcraid_err("ISR: error interrupts: %x initiating reset\n",
                intrs);
        intrs = ioread32(
                pinstance->int_regs.ioa_host_interrupt_clr_reg);
        spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
        pmcraid_initiate_reset(pinstance);
        spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
    } else {
        /* If interrupt was as part of the ioa initialization,
         * clear. Delete the timer and wakeup the
         * reset engine to proceed with reset sequence
         */
        if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
            pmcraid_clr_trans_op(pinstance);
        } else {
            iowrite32(intrs,
                pinstance->int_regs.ioa_host_interrupt_clr_reg);
            ioread32(
                pinstance->int_regs.ioa_host_interrupt_clr_reg);

            tasklet_schedule(
                    &(pinstance->isr_tasklet[hrrq_id]));
        }
    }

    return IRQ_HANDLED;
}


static void pmcraid_worker_function(struct work_struct *workp)
{
    struct pmcraid_instance *pinstance;
    struct pmcraid_resource_entry *res;
    struct pmcraid_resource_entry *temp;
    struct scsi_device *sdev;
    unsigned long lock_flags;
    unsigned long host_lock_flags;
    u16 fw_version;
    u8 bus, target, lun;

    pinstance = container_of(workp, struct pmcraid_instance, worker_q);
    /* add resources only after host is added into system */
    if (!atomic_read(&pinstance->expose_resources))
        return;

    fw_version = be16_to_cpu(pinstance->inq_data->fw_version);

    spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
    list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue) {

        if (res->change_detected == RES_CHANGE_DEL && res->scsi_dev) {
            sdev = res->scsi_dev;

            /* host_lock must be held before calling
             * scsi_device_get
             */
            spin_lock_irqsave(pinstance->host->host_lock,
                      host_lock_flags);
            if (!scsi_device_get(sdev)) {
                spin_unlock_irqrestore(
                        pinstance->host->host_lock,
                        host_lock_flags);
                pmcraid_info("deleting %x from midlayer\n",
                         res->cfg_entry.resource_address);
                list_move_tail(&res->queue,
                        &pinstance->free_res_q);
                spin_unlock_irqrestore(
                    &pinstance->resource_lock,
                    lock_flags);
                scsi_remove_device(sdev);
                scsi_device_put(sdev);
                spin_lock_irqsave(&pinstance->resource_lock,
                           lock_flags);
                res->change_detected = 0;
            } else {
                spin_unlock_irqrestore(
                        pinstance->host->host_lock,
                        host_lock_flags);
            }
        }
    }

    list_for_each_entry(res, &pinstance->used_res_q, queue) {

        if (res->change_detected == RES_CHANGE_ADD) {

            if (!pmcraid_expose_resource(fw_version,
                             &res->cfg_entry))
                continue;

            if (RES_IS_VSET(res->cfg_entry)) {
                bus = PMCRAID_VSET_BUS_ID;
                if (fw_version <= PMCRAID_FW_VERSION_1)
                    target = res->cfg_entry.unique_flags1;
                else
                    target = res->cfg_entry.array_id & 0xFF;
                lun = PMCRAID_VSET_LUN_ID;
            } else {
                bus = PMCRAID_PHYS_BUS_ID;
                target =
                     RES_TARGET(
                    res->cfg_entry.resource_address);
                lun = RES_LUN(res->cfg_entry.resource_address);
            }

            res->change_detected = 0;
            spin_unlock_irqrestore(&pinstance->resource_lock,
                        lock_flags);
            scsi_add_device(pinstance->host, bus, target, lun);
            spin_lock_irqsave(&pinstance->resource_lock,
                       lock_flags);
        }
    }

    spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
}

static void pmcraid_tasklet_function(unsigned long instance)
{
    struct pmcraid_isr_param *hrrq_vector;
    struct pmcraid_instance *pinstance;
    unsigned long hrrq_lock_flags;
    unsigned long pending_lock_flags;
    unsigned long host_lock_flags;
    spinlock_t *lockp; /* hrrq buffer lock */
    int id;
    __le32 resp;

    hrrq_vector = (struct pmcraid_isr_param *)instance;
    pinstance = hrrq_vector->drv_inst;
    id = hrrq_vector->hrrq_id;
    lockp = &(pinstance->hrrq_lock[id]);

    /* loop through each of the commands responded by IOA. Each HRRQ buf is
     * protected by its own lock. Traversals must be done within this lock
     * as there may be multiple tasklets running on multiple CPUs. Note
     * that the lock is held just for picking up the response handle and
     * manipulating hrrq_curr/toggle_bit values.
     */
    spin_lock_irqsave(lockp, hrrq_lock_flags);

    resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));

    while ((resp & HRRQ_TOGGLE_BIT) ==
        pinstance->host_toggle_bit[id]) {

        int cmd_index = resp >> 2;
        struct pmcraid_cmd *cmd = NULL;

        if (pinstance->hrrq_curr[id] < pinstance->hrrq_end[id]) {
            pinstance->hrrq_curr[id]++;
        } else {
            pinstance->hrrq_curr[id] = pinstance->hrrq_start[id];
            pinstance->host_toggle_bit[id] ^= 1u;
        }

        if (cmd_index >= PMCRAID_MAX_CMD) {
            /* In case of invalid response handle, log message */
            pmcraid_err("Invalid response handle %d\n", cmd_index);
            resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
            continue;
        }

        cmd = pinstance->cmd_list[cmd_index];
        spin_unlock_irqrestore(lockp, hrrq_lock_flags);

        spin_lock_irqsave(&pinstance->pending_pool_lock,
                   pending_lock_flags);
        list_del(&cmd->free_list);
        spin_unlock_irqrestore(&pinstance->pending_pool_lock,
                    pending_lock_flags);
        del_timer(&cmd->timer);
        atomic_dec(&pinstance->outstanding_cmds);

        if (cmd->cmd_done == pmcraid_ioa_reset) {
            spin_lock_irqsave(pinstance->host->host_lock,
                      host_lock_flags);
            cmd->cmd_done(cmd);
            spin_unlock_irqrestore(pinstance->host->host_lock,
                           host_lock_flags);
        } else if (cmd->cmd_done != NULL) {
            cmd->cmd_done(cmd);
        }
        /* loop over until we are done with all responses */
        spin_lock_irqsave(lockp, hrrq_lock_flags);
        resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
    }

    spin_unlock_irqrestore(lockp, hrrq_lock_flags);
}

static
void pmcraid_unregister_interrupt_handler(struct pmcraid_instance *pinstance)
{
    int i;

    for (i = 0; i < pinstance->num_hrrq; i++)
        free_irq(pinstance->hrrq_vector[i].vector,
             &(pinstance->hrrq_vector[i]));

    if (pinstance->interrupt_mode) {
        pci_disable_msix(pinstance->pdev);
        pinstance->interrupt_mode = 0;
    }
}

static int
pmcraid_register_interrupt_handler(struct pmcraid_instance *pinstance)
{
    int rc;
    struct pci_dev *pdev = pinstance->pdev;

    if ((pmcraid_enable_msix) &&
        (pci_find_capability(pdev, PCI_CAP_ID_MSIX))) {
        int num_hrrq = PMCRAID_NUM_MSIX_VECTORS;
        struct msix_entry entries[PMCRAID_NUM_MSIX_VECTORS];
        int i;
        for (i = 0; i < PMCRAID_NUM_MSIX_VECTORS; i++)
            entries[i].entry = i;

        rc = pci_enable_msix(pdev, entries, num_hrrq);
        if (rc < 0)
            goto pmcraid_isr_legacy;

        /* Check how many MSIX vectors are allocated and register
         * msi-x handlers for each of them giving appropriate buffer
         */
        if (rc > 0) {
            num_hrrq = rc;
            if (pci_enable_msix(pdev, entries, num_hrrq))
                goto pmcraid_isr_legacy;
        }

        for (i = 0; i < num_hrrq; i++) {
            pinstance->hrrq_vector[i].hrrq_id = i;
            pinstance->hrrq_vector[i].drv_inst = pinstance;
            pinstance->hrrq_vector[i].vector = entries[i].vector;
            rc = request_irq(pinstance->hrrq_vector[i].vector,
                    pmcraid_isr_msix, 0,
                    PMCRAID_DRIVER_NAME,
                    &(pinstance->hrrq_vector[i]));

            if (rc) {
                int j;
                for (j = 0; j < i; j++)
                    free_irq(entries[j].vector,
                         &(pinstance->hrrq_vector[j]));
                pci_disable_msix(pdev);
                goto pmcraid_isr_legacy;
            }
        }

        pinstance->num_hrrq = num_hrrq;
        pinstance->interrupt_mode = 1;
        iowrite32(DOORBELL_INTR_MODE_MSIX,
              pinstance->int_regs.host_ioa_interrupt_reg);
        ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
        goto pmcraid_isr_out;
    }

pmcraid_isr_legacy:
    /* If MSI-X registration failed fallback to legacy mode, where
     * only one hrrq entry will be used
     */
    pinstance->hrrq_vector[0].hrrq_id = 0;
    pinstance->hrrq_vector[0].drv_inst = pinstance;
    pinstance->hrrq_vector[0].vector = pdev->irq;
    pinstance->num_hrrq = 1;
    rc = 0;

    rc = request_irq(pdev->irq, pmcraid_isr, IRQF_SHARED,
             PMCRAID_DRIVER_NAME, &pinstance->hrrq_vector[0]);
pmcraid_isr_out:
    return rc;
}

static void
pmcraid_release_cmd_blocks(struct pmcraid_instance *pinstance, int max_index)
{
    int i;
    for (i = 0; i < max_index; i++) {
        kmem_cache_free(pinstance->cmd_cachep, pinstance->cmd_list[i]);
        pinstance->cmd_list[i] = NULL;
    }
    kmem_cache_destroy(pinstance->cmd_cachep);
    pinstance->cmd_cachep = NULL;
}

static void
pmcraid_release_control_blocks(
    struct pmcraid_instance *pinstance,
    int max_index
)
{
    int i;

    if (pinstance->control_pool == NULL)
        return;

    for (i = 0; i < max_index; i++) {
        pci_pool_free(pinstance->control_pool,
                  pinstance->cmd_list[i]->ioa_cb,
                  pinstance->cmd_list[i]->ioa_cb_bus_addr);
        pinstance->cmd_list[i]->ioa_cb = NULL;
        pinstance->cmd_list[i]->ioa_cb_bus_addr = 0;
    }
    pci_pool_destroy(pinstance->control_pool);
    pinstance->control_pool = NULL;
}

static int __devinit
pmcraid_allocate_cmd_blocks(struct pmcraid_instance *pinstance)
{
    int i;

    sprintf(pinstance->cmd_pool_name, "pmcraid_cmd_pool_%d",
        pinstance->host->unique_id);


    pinstance->cmd_cachep = kmem_cache_create(
                    pinstance->cmd_pool_name,
                    sizeof(struct pmcraid_cmd), 0,
                    SLAB_HWCACHE_ALIGN, NULL);
    if (!pinstance->cmd_cachep)
        return -ENOMEM;

    for (i = 0; i < PMCRAID_MAX_CMD; i++) {
        pinstance->cmd_list[i] =
            kmem_cache_alloc(pinstance->cmd_cachep, GFP_KERNEL);
        if (!pinstance->cmd_list[i]) {
            pmcraid_release_cmd_blocks(pinstance, i);
            return -ENOMEM;
        }
    }
    return 0;
}

static int __devinit
pmcraid_allocate_control_blocks(struct pmcraid_instance *pinstance)
{
    int i;

    sprintf(pinstance->ctl_pool_name, "pmcraid_control_pool_%d",
        pinstance->host->unique_id);

    pinstance->control_pool =
        pci_pool_create(pinstance->ctl_pool_name,
                pinstance->pdev,
                sizeof(struct pmcraid_control_block),
                PMCRAID_IOARCB_ALIGNMENT, 0);

    if (!pinstance->control_pool)
        return -ENOMEM;

    for (i = 0; i < PMCRAID_MAX_CMD; i++) {
        pinstance->cmd_list[i]->ioa_cb =
            pci_pool_alloc(
                pinstance->control_pool,
                GFP_KERNEL,
                &(pinstance->cmd_list[i]->ioa_cb_bus_addr));

        if (!pinstance->cmd_list[i]->ioa_cb) {
            pmcraid_release_control_blocks(pinstance, i);
            return -ENOMEM;
        }
        memset(pinstance->cmd_list[i]->ioa_cb, 0,
            sizeof(struct pmcraid_control_block));
    }
    return 0;
}

static void
pmcraid_release_host_rrqs(struct pmcraid_instance *pinstance, int maxindex)
{
    int i;
    for (i = 0; i < maxindex; i++) {

        pci_free_consistent(pinstance->pdev,
                    HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD,
                    pinstance->hrrq_start[i],
                    pinstance->hrrq_start_bus_addr[i]);

        /* reset pointers and toggle bit to zeros */
        pinstance->hrrq_start[i] = NULL;
        pinstance->hrrq_start_bus_addr[i] = 0;
        pinstance->host_toggle_bit[i] = 0;
    }
}

static int __devinit
pmcraid_allocate_host_rrqs(struct pmcraid_instance *pinstance)
{
    int i, buffer_size;

    buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;

    for (i = 0; i < pinstance->num_hrrq; i++) {
        pinstance->hrrq_start[i] =
            pci_alloc_consistent(
                    pinstance->pdev,
                    buffer_size,
                    &(pinstance->hrrq_start_bus_addr[i]));

        if (pinstance->hrrq_start[i] == 0) {
            pmcraid_err("pci_alloc failed for hrrq vector : %d\n",
                    i);
            pmcraid_release_host_rrqs(pinstance, i);
            return -ENOMEM;
        }

        memset(pinstance->hrrq_start[i], 0, buffer_size);
        pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
        pinstance->hrrq_end[i] =
            pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
        pinstance->host_toggle_bit[i] = 1;
        spin_lock_init(&pinstance->hrrq_lock[i]);
    }
    return 0;
}

static void pmcraid_release_hcams(struct pmcraid_instance *pinstance)
{
    if (pinstance->ccn.msg != NULL) {
        pci_free_consistent(pinstance->pdev,
                    PMCRAID_AEN_HDR_SIZE +
                    sizeof(struct pmcraid_hcam_ccn_ext),
                    pinstance->ccn.msg,
                    pinstance->ccn.baddr);

        pinstance->ccn.msg = NULL;
        pinstance->ccn.hcam = NULL;
        pinstance->ccn.baddr = 0;
    }

    if (pinstance->ldn.msg != NULL) {
        pci_free_consistent(pinstance->pdev,
                    PMCRAID_AEN_HDR_SIZE +
                    sizeof(struct pmcraid_hcam_ldn),
                    pinstance->ldn.msg,
                    pinstance->ldn.baddr);

        pinstance->ldn.msg = NULL;
        pinstance->ldn.hcam = NULL;
        pinstance->ldn.baddr = 0;
    }
}

static int pmcraid_allocate_hcams(struct pmcraid_instance *pinstance)
{
    pinstance->ccn.msg = pci_alloc_consistent(
                    pinstance->pdev,
                    PMCRAID_AEN_HDR_SIZE +
                    sizeof(struct pmcraid_hcam_ccn_ext),
                    &(pinstance->ccn.baddr));

    pinstance->ldn.msg = pci_alloc_consistent(
                    pinstance->pdev,
                    PMCRAID_AEN_HDR_SIZE +
                    sizeof(struct pmcraid_hcam_ldn),
                    &(pinstance->ldn.baddr));

    if (pinstance->ldn.msg == NULL || pinstance->ccn.msg == NULL) {
        pmcraid_release_hcams(pinstance);
    } else {
        pinstance->ccn.hcam =
            (void *)pinstance->ccn.msg + PMCRAID_AEN_HDR_SIZE;
        pinstance->ldn.hcam =
            (void *)pinstance->ldn.msg + PMCRAID_AEN_HDR_SIZE;

        atomic_set(&pinstance->ccn.ignore, 0);
        atomic_set(&pinstance->ldn.ignore, 0);
    }

    return (pinstance->ldn.msg == NULL) ? -ENOMEM : 0;
}

static void pmcraid_release_config_buffers(struct pmcraid_instance *pinstance)
{
    if (pinstance->cfg_table != NULL &&
        pinstance->cfg_table_bus_addr != 0) {
        pci_free_consistent(pinstance->pdev,
                    sizeof(struct pmcraid_config_table),
                    pinstance->cfg_table,
                    pinstance->cfg_table_bus_addr);
        pinstance->cfg_table = NULL;
        pinstance->cfg_table_bus_addr = 0;
    }

    if (pinstance->res_entries != NULL) {
        int i;

        for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
            list_del(&pinstance->res_entries[i].queue);
        kfree(pinstance->res_entries);
        pinstance->res_entries = NULL;
    }

    pmcraid_release_hcams(pinstance);
}

static int __devinit
pmcraid_allocate_config_buffers(struct pmcraid_instance *pinstance)
{
    int i;

    pinstance->res_entries =
            kzalloc(sizeof(struct pmcraid_resource_entry) *
                PMCRAID_MAX_RESOURCES, GFP_KERNEL);

    if (NULL == pinstance->res_entries) {
        pmcraid_err("failed to allocate memory for resource table\n");
        return -ENOMEM;
    }

    for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
        list_add_tail(&pinstance->res_entries[i].queue,
                  &pinstance->free_res_q);

    pinstance->cfg_table =
        pci_alloc_consistent(pinstance->pdev,
                     sizeof(struct pmcraid_config_table),
                     &pinstance->cfg_table_bus_addr);

    if (NULL == pinstance->cfg_table) {
        pmcraid_err("couldn't alloc DMA memory for config table\n");
        pmcraid_release_config_buffers(pinstance);
        return -ENOMEM;
    }

    if (pmcraid_allocate_hcams(pinstance)) {
        pmcraid_err("could not alloc DMA memory for HCAMS\n");
        pmcraid_release_config_buffers(pinstance);
        return -ENOMEM;
    }

    return 0;
}

static void pmcraid_init_tasklets(struct pmcraid_instance *pinstance)
{
    int i;
    for (i = 0; i < pinstance->num_hrrq; i++)
        tasklet_init(&pinstance->isr_tasklet[i],
                 pmcraid_tasklet_function,
                 (unsigned long)&pinstance->hrrq_vector[i]);
}

static void pmcraid_kill_tasklets(struct pmcraid_instance *pinstance)
{
    int i;
    for (i = 0; i < pinstance->num_hrrq; i++)
        tasklet_kill(&pinstance->isr_tasklet[i]);
}

static void pmcraid_release_buffers(struct pmcraid_instance *pinstance)
{
    pmcraid_release_config_buffers(pinstance);
    pmcraid_release_control_blocks(pinstance, PMCRAID_MAX_CMD);
    pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
    pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);

    if (pinstance->inq_data != NULL) {
        pci_free_consistent(pinstance->pdev,
                    sizeof(struct pmcraid_inquiry_data),
                    pinstance->inq_data,
                    pinstance->inq_data_baddr);

        pinstance->inq_data = NULL;
        pinstance->inq_data_baddr = 0;
    }

    if (pinstance->timestamp_data != NULL) {
        pci_free_consistent(pinstance->pdev,
                    sizeof(struct pmcraid_timestamp_data),
                    pinstance->timestamp_data,
                    pinstance->timestamp_data_baddr);

        pinstance->timestamp_data = NULL;
        pinstance->timestamp_data_baddr = 0;
    }
}

static int __devinit pmcraid_init_buffers(struct pmcraid_instance *pinstance)
{
    int i;

    if (pmcraid_allocate_host_rrqs(pinstance)) {
        pmcraid_err("couldn't allocate memory for %d host rrqs\n",
                 pinstance->num_hrrq);
        return -ENOMEM;
    }

    if (pmcraid_allocate_config_buffers(pinstance)) {
        pmcraid_err("couldn't allocate memory for config buffers\n");
        pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
        return -ENOMEM;
    }

    if (pmcraid_allocate_cmd_blocks(pinstance)) {
        pmcraid_err("couldn't allocate memory for cmd blocks\n");
        pmcraid_release_config_buffers(pinstance);
        pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
        return -ENOMEM;
    }

    if (pmcraid_allocate_control_blocks(pinstance)) {
        pmcraid_err("couldn't allocate memory control blocks\n");
        pmcraid_release_config_buffers(pinstance);
        pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
        pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
        return -ENOMEM;
    }

    /* allocate DMAable memory for page D0 INQUIRY buffer */
    pinstance->inq_data = pci_alloc_consistent(
                    pinstance->pdev,
                    sizeof(struct pmcraid_inquiry_data),
                    &pinstance->inq_data_baddr);

    if (pinstance->inq_data == NULL) {
        pmcraid_err("couldn't allocate DMA memory for INQUIRY\n");
        pmcraid_release_buffers(pinstance);
        return -ENOMEM;
    }

    /* allocate DMAable memory for set timestamp data buffer */
    pinstance->timestamp_data = pci_alloc_consistent(
                    pinstance->pdev,
                    sizeof(struct pmcraid_timestamp_data),
                    &pinstance->timestamp_data_baddr);

    if (pinstance->timestamp_data == NULL) {
        pmcraid_err("couldn't allocate DMA memory for \
                set time_stamp \n");
        pmcraid_release_buffers(pinstance);
        return -ENOMEM;
    }


    /* Initialize all the command blocks and add them to free pool. No
     * need to lock (free_pool_lock) as this is done in initialization
     * itself
     */
    for (i = 0; i < PMCRAID_MAX_CMD; i++) {
        struct pmcraid_cmd *cmdp = pinstance->cmd_list[i];
        pmcraid_init_cmdblk(cmdp, i);
        cmdp->drv_inst = pinstance;
        list_add_tail(&cmdp->free_list, &pinstance->free_cmd_pool);
    }

    return 0;
}

static void pmcraid_reinit_buffers(struct pmcraid_instance *pinstance)
{
    int i;
    int buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;

    for (i = 0; i < pinstance->num_hrrq; i++) {
        memset(pinstance->hrrq_start[i], 0, buffer_size);
        pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
        pinstance->hrrq_end[i] =
            pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
        pinstance->host_toggle_bit[i] = 1;
    }
}

static int __devinit pmcraid_init_instance(
    struct pci_dev *pdev,
    struct Scsi_Host *host,
    void __iomem *mapped_pci_addr
)
{
    struct pmcraid_instance *pinstance =
        (struct pmcraid_instance *)host->hostdata;

    pinstance->host = host;
    pinstance->pdev = pdev;

    /* Initialize register addresses */
    pinstance->mapped_dma_addr = mapped_pci_addr;

    /* Initialize chip-specific details */
    {
        struct pmcraid_chip_details *chip_cfg = pinstance->chip_cfg;
        struct pmcraid_interrupts *pint_regs = &pinstance->int_regs;

        pinstance->ioarrin = mapped_pci_addr + chip_cfg->ioarrin;

        pint_regs->ioa_host_interrupt_reg =
            mapped_pci_addr + chip_cfg->ioa_host_intr;
        pint_regs->ioa_host_interrupt_clr_reg =
            mapped_pci_addr + chip_cfg->ioa_host_intr_clr;
        pint_regs->ioa_host_msix_interrupt_reg =
            mapped_pci_addr + chip_cfg->ioa_host_msix_intr;
        pint_regs->host_ioa_interrupt_reg =
            mapped_pci_addr + chip_cfg->host_ioa_intr;
        pint_regs->host_ioa_interrupt_clr_reg =
            mapped_pci_addr + chip_cfg->host_ioa_intr_clr;

        /* Current version of firmware exposes interrupt mask set
         * and mask clr registers through memory mapped bar0.
         */
        pinstance->mailbox = mapped_pci_addr + chip_cfg->mailbox;
        pinstance->ioa_status = mapped_pci_addr + chip_cfg->ioastatus;
        pint_regs->ioa_host_interrupt_mask_reg =
            mapped_pci_addr + chip_cfg->ioa_host_mask;
        pint_regs->ioa_host_interrupt_mask_clr_reg =
            mapped_pci_addr + chip_cfg->ioa_host_mask_clr;
        pint_regs->global_interrupt_mask_reg =
            mapped_pci_addr + chip_cfg->global_intr_mask;
    };

    pinstance->ioa_reset_attempts = 0;
    init_waitqueue_head(&pinstance->reset_wait_q);

    atomic_set(&pinstance->outstanding_cmds, 0);
    atomic_set(&pinstance->last_message_id, 0);
    atomic_set(&pinstance->expose_resources, 0);

    INIT_LIST_HEAD(&pinstance->free_res_q);
    INIT_LIST_HEAD(&pinstance->used_res_q);
    INIT_LIST_HEAD(&pinstance->free_cmd_pool);
    INIT_LIST_HEAD(&pinstance->pending_cmd_pool);

    spin_lock_init(&pinstance->free_pool_lock);
    spin_lock_init(&pinstance->pending_pool_lock);
    spin_lock_init(&pinstance->resource_lock);
    mutex_init(&pinstance->aen_queue_lock);

    /* Work-queue (Shared) for deferred processing error handling */
    INIT_WORK(&pinstance->worker_q, pmcraid_worker_function);

    /* Initialize the default log_level */
    pinstance->current_log_level = pmcraid_log_level;

    /* Setup variables required for reset engine */
    pinstance->ioa_state = IOA_STATE_UNKNOWN;
    pinstance->reset_cmd = NULL;
    return 0;
}

static void pmcraid_shutdown(struct pci_dev *pdev)
{
    struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
    pmcraid_reset_bringdown(pinstance);
}


static unsigned short pmcraid_get_minor(void)
{
    int minor;

    minor = find_first_zero_bit(pmcraid_minor, sizeof(pmcraid_minor));
    __set_bit(minor, pmcraid_minor);
    return minor;
}

static void pmcraid_release_minor(unsigned short minor)
{
    __clear_bit(minor, pmcraid_minor);
}

static int pmcraid_setup_chrdev(struct pmcraid_instance *pinstance)
{
    int minor;
    int error;

    minor = pmcraid_get_minor();
    cdev_init(&pinstance->cdev, &pmcraid_fops);
    pinstance->cdev.owner = THIS_MODULE;

    error = cdev_add(&pinstance->cdev, MKDEV(pmcraid_major, minor), 1);

    if (error)
        pmcraid_release_minor(minor);
    else
        device_create(pmcraid_class, NULL, MKDEV(pmcraid_major, minor),
                  NULL, "%s%u", PMCRAID_DEVFILE, minor);
    return error;
}

static void pmcraid_release_chrdev(struct pmcraid_instance *pinstance)
{
    pmcraid_release_minor(MINOR(pinstance->cdev.dev));
    device_destroy(pmcraid_class,
               MKDEV(pmcraid_major, MINOR(pinstance->cdev.dev)));
    cdev_del(&pinstance->cdev);
}

static void __devexit pmcraid_remove(struct pci_dev *pdev)
{
    struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);

    /* remove the management interface (/dev file) for this device */
    pmcraid_release_chrdev(pinstance);

    /* remove host template from scsi midlayer */
    scsi_remove_host(pinstance->host);

    /* block requests from mid-layer */
    scsi_block_requests(pinstance->host);

    /* initiate shutdown adapter */
    pmcraid_shutdown(pdev);

    pmcraid_disable_interrupts(pinstance, ~0);
    flush_work(&pinstance->worker_q);

    pmcraid_kill_tasklets(pinstance);
    pmcraid_unregister_interrupt_handler(pinstance);
    pmcraid_release_buffers(pinstance);
    iounmap(pinstance->mapped_dma_addr);
    pci_release_regions(pdev);
    scsi_host_put(pinstance->host);
    pci_disable_device(pdev);

    return;
}

#ifdef CONFIG_PM

static int pmcraid_suspend(struct pci_dev *pdev, pm_message_t state)
{
    struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);

    pmcraid_shutdown(pdev);
    pmcraid_disable_interrupts(pinstance, ~0);
    pmcraid_kill_tasklets(pinstance);
    pci_set_drvdata(pinstance->pdev, pinstance);
    pmcraid_unregister_interrupt_handler(pinstance);
    pci_save_state(pdev);
    pci_disable_device(pdev);
    pci_set_power_state(pdev, pci_choose_state(pdev, state));

    return 0;
}

static int pmcraid_resume(struct pci_dev *pdev)
{
    struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
    struct Scsi_Host *host = pinstance->host;
    int rc;

    pci_set_power_state(pdev, PCI_D0);
    pci_enable_wake(pdev, PCI_D0, 0);
    pci_restore_state(pdev);

    rc = pci_enable_device(pdev);

    if (rc) {
        dev_err(&pdev->dev, "resume: Enable device failed\n");
        return rc;
    }

    pci_set_master(pdev);

    if ((sizeof(dma_addr_t) == 4) ||
         pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
        rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));

    if (rc == 0)
        rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));

    if (rc != 0) {
        dev_err(&pdev->dev, "resume: Failed to set PCI DMA mask\n");
        goto disable_device;
    }

    pmcraid_disable_interrupts(pinstance, ~0);
    atomic_set(&pinstance->outstanding_cmds, 0);
    rc = pmcraid_register_interrupt_handler(pinstance);

    if (rc) {
        dev_err(&pdev->dev,
            "resume: couldn't register interrupt handlers\n");
        rc = -ENODEV;
        goto release_host;
    }

    pmcraid_init_tasklets(pinstance);
    pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);

    /* Start with hard reset sequence which brings up IOA to operational
     * state as well as completes the reset sequence.
     */
    pinstance->ioa_hard_reset = 1;

    /* Start IOA firmware initialization and bring card to Operational
     * state.
     */
    if (pmcraid_reset_bringup(pinstance)) {
        dev_err(&pdev->dev, "couldn't initialize IOA\n");
        rc = -ENODEV;
        goto release_tasklets;
    }

    return 0;

release_tasklets:
    pmcraid_disable_interrupts(pinstance, ~0);
    pmcraid_kill_tasklets(pinstance);
    pmcraid_unregister_interrupt_handler(pinstance);

release_host:
    scsi_host_put(host);

disable_device:
    pci_disable_device(pdev);

    return rc;
}

#else

#define pmcraid_suspend NULL
#define pmcraid_resume  NULL

#endif /* CONFIG_PM */

static void pmcraid_complete_ioa_reset(struct pmcraid_cmd *cmd)
{
    struct pmcraid_instance *pinstance = cmd->drv_inst;
    unsigned long flags;

    spin_lock_irqsave(pinstance->host->host_lock, flags);
    pmcraid_ioa_reset(cmd);
    spin_unlock_irqrestore(pinstance->host->host_lock, flags);
    scsi_unblock_requests(pinstance->host);
    schedule_work(&pinstance->worker_q);
}

static void pmcraid_set_supported_devs(struct pmcraid_cmd *cmd)
{
    struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
    void (*cmd_done) (struct pmcraid_cmd *) = pmcraid_complete_ioa_reset;

    pmcraid_reinit_cmdblk(cmd);

    ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
    ioarcb->request_type = REQ_TYPE_IOACMD;
    ioarcb->cdb[0] = PMCRAID_SET_SUPPORTED_DEVICES;
    ioarcb->cdb[1] = ALL_DEVICES_SUPPORTED;

    /* If this was called as part of resource table reinitialization due to
     * lost CCN, it is enough to return the command block back to free pool
     * as part of set_supported_devs completion function.
     */
    if (cmd->drv_inst->reinit_cfg_table) {
        cmd->drv_inst->reinit_cfg_table = 0;
        cmd->release = 1;
        cmd_done = pmcraid_reinit_cfgtable_done;
    }

    /* we will be done with the reset sequence after set supported devices,
     * setup the done function to return the command block back to free
     * pool
     */
    pmcraid_send_cmd(cmd,
             cmd_done,
             PMCRAID_SET_SUP_DEV_TIMEOUT,
             pmcraid_timeout_handler);
    return;
}

static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd)
{
    struct pmcraid_instance *pinstance = cmd->drv_inst;
    struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
    __be32 time_stamp_len = cpu_to_be32(PMCRAID_TIMESTAMP_LEN);
    struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;

    struct timeval tv;
    __le64 timestamp;

    do_gettimeofday(&tv);
    timestamp = tv.tv_sec * 1000;

    pinstance->timestamp_data->timestamp[0] = (__u8)(timestamp);
    pinstance->timestamp_data->timestamp[1] = (__u8)((timestamp) >> 8);
    pinstance->timestamp_data->timestamp[2] = (__u8)((timestamp) >> 16);
    pinstance->timestamp_data->timestamp[3] = (__u8)((timestamp) >> 24);
    pinstance->timestamp_data->timestamp[4] = (__u8)((timestamp) >> 32);
    pinstance->timestamp_data->timestamp[5] = (__u8)((timestamp)  >> 40);

    pmcraid_reinit_cmdblk(cmd);
    ioarcb->request_type = REQ_TYPE_SCSI;
    ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
    ioarcb->cdb[0] = PMCRAID_SCSI_SET_TIMESTAMP;
    ioarcb->cdb[1] = PMCRAID_SCSI_SERVICE_ACTION;
    memcpy(&(ioarcb->cdb[6]), &time_stamp_len, sizeof(time_stamp_len));

    ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
                    offsetof(struct pmcraid_ioarcb,
                        add_data.u.ioadl[0]));
    ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
    ioarcb->ioarcb_bus_addr &= ~(0x1FULL);

    ioarcb->request_flags0 |= NO_LINK_DESCS;
    ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
    ioarcb->data_transfer_length =
        cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
    ioadl = &(ioarcb->add_data.u.ioadl[0]);
    ioadl->flags = IOADL_FLAGS_LAST_DESC;
    ioadl->address = cpu_to_le64(pinstance->timestamp_data_baddr);
    ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_timestamp_data));

    if (!pinstance->timestamp_error) {
        pinstance->timestamp_error = 0;
        pmcraid_send_cmd(cmd, pmcraid_set_supported_devs,
             PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
    } else {
        pmcraid_send_cmd(cmd, pmcraid_return_cmd,
             PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
        return;
    }
}


static void pmcraid_init_res_table(struct pmcraid_cmd *cmd)
{
    struct pmcraid_instance *pinstance = cmd->drv_inst;
    struct pmcraid_resource_entry *res, *temp;
    struct pmcraid_config_table_entry *cfgte;
    unsigned long lock_flags;
    int found, rc, i;
    u16 fw_version;
    LIST_HEAD(old_res);

    if (pinstance->cfg_table->flags & MICROCODE_UPDATE_REQUIRED)
        pmcraid_err("IOA requires microcode download\n");

    fw_version = be16_to_cpu(pinstance->inq_data->fw_version);

    /* resource list is protected by pinstance->resource_lock.
     * init_res_table can be called from probe (user-thread) or runtime
     * reset (timer/tasklet)
     */
    spin_lock_irqsave(&pinstance->resource_lock, lock_flags);

    list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue)
        list_move_tail(&res->queue, &old_res);

    for (i = 0; i < pinstance->cfg_table->num_entries; i++) {
        if (be16_to_cpu(pinstance->inq_data->fw_version) <=
                        PMCRAID_FW_VERSION_1)
            cfgte = &pinstance->cfg_table->entries[i];
        else
            cfgte = (struct pmcraid_config_table_entry *)
                    &pinstance->cfg_table->entries_ext[i];

        if (!pmcraid_expose_resource(fw_version, cfgte))
            continue;

        found = 0;

        /* If this entry was already detected and initialized */
        list_for_each_entry_safe(res, temp, &old_res, queue) {

            rc = memcmp(&res->cfg_entry.resource_address,
                    &cfgte->resource_address,
                    sizeof(cfgte->resource_address));
            if (!rc) {
                list_move_tail(&res->queue,
                        &pinstance->used_res_q);
                found = 1;
                break;
            }
        }

        /* If this is new entry, initialize it and add it the queue */
        if (!found) {

            if (list_empty(&pinstance->free_res_q)) {
                pmcraid_err("Too many devices attached\n");
                break;
            }

            found = 1;
            res = list_entry(pinstance->free_res_q.next,
                     struct pmcraid_resource_entry, queue);

            res->scsi_dev = NULL;
            res->change_detected = RES_CHANGE_ADD;
            res->reset_progress = 0;
            list_move_tail(&res->queue, &pinstance->used_res_q);
        }

        /* copy new configuration table entry details into driver
         * maintained resource entry
         */
        if (found) {
            memcpy(&res->cfg_entry, cfgte,
                    pinstance->config_table_entry_size);
            pmcraid_info("New res type:%x, vset:%x, addr:%x:\n",
                 res->cfg_entry.resource_type,
                 (fw_version <= PMCRAID_FW_VERSION_1 ?
                    res->cfg_entry.unique_flags1 :
                        res->cfg_entry.array_id & 0xFF),
                 le32_to_cpu(res->cfg_entry.resource_address));
        }
    }

    /* Detect any deleted entries, mark them for deletion from mid-layer */
    list_for_each_entry_safe(res, temp, &old_res, queue) {

        if (res->scsi_dev) {
            res->change_detected = RES_CHANGE_DEL;
            res->cfg_entry.resource_handle =
                PMCRAID_INVALID_RES_HANDLE;
            list_move_tail(&res->queue, &pinstance->used_res_q);
        } else {
            list_move_tail(&res->queue, &pinstance->free_res_q);
        }
    }

    /* release the resource list lock */
    spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
    pmcraid_set_timestamp(cmd);
}

static void pmcraid_querycfg(struct pmcraid_cmd *cmd)
{
    struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
    struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
    struct pmcraid_instance *pinstance = cmd->drv_inst;
    int cfg_table_size = cpu_to_be32(sizeof(struct pmcraid_config_table));

    if (be16_to_cpu(pinstance->inq_data->fw_version) <=
                    PMCRAID_FW_VERSION_1)
        pinstance->config_table_entry_size =
            sizeof(struct pmcraid_config_table_entry);
    else
        pinstance->config_table_entry_size =
            sizeof(struct pmcraid_config_table_entry_ext);

    ioarcb->request_type = REQ_TYPE_IOACMD;
    ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);

    ioarcb->cdb[0] = PMCRAID_QUERY_IOA_CONFIG;

    /* firmware requires 4-byte length field, specified in B.E format */
    memcpy(&(ioarcb->cdb[10]), &cfg_table_size, sizeof(cfg_table_size));

    /* Since entire config table can be described by single IOADL, it can
     * be part of IOARCB itself
     */
    ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
                    offsetof(struct pmcraid_ioarcb,
                        add_data.u.ioadl[0]));
    ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
    ioarcb->ioarcb_bus_addr &= ~(0x1FULL);

    ioarcb->request_flags0 |= NO_LINK_DESCS;
    ioarcb->data_transfer_length =
        cpu_to_le32(sizeof(struct pmcraid_config_table));

    ioadl = &(ioarcb->add_data.u.ioadl[0]);
    ioadl->flags = IOADL_FLAGS_LAST_DESC;
    ioadl->address = cpu_to_le64(pinstance->cfg_table_bus_addr);
    ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_config_table));

    pmcraid_send_cmd(cmd, pmcraid_init_res_table,
             PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
}


static int __devinit pmcraid_probe(
    struct pci_dev *pdev,
    const struct pci_device_id *dev_id
)
{
    struct pmcraid_instance *pinstance;
    struct Scsi_Host *host;
    void __iomem *mapped_pci_addr;
    int rc = PCIBIOS_SUCCESSFUL;

    if (atomic_read(&pmcraid_adapter_count) >= PMCRAID_MAX_ADAPTERS) {
        pmcraid_err
            ("maximum number(%d) of supported adapters reached\n",
             atomic_read(&pmcraid_adapter_count));
        return -ENOMEM;
    }

    atomic_inc(&pmcraid_adapter_count);
    rc = pci_enable_device(pdev);

    if (rc) {
        dev_err(&pdev->dev, "Cannot enable adapter\n");
        atomic_dec(&pmcraid_adapter_count);
        return rc;
    }

    dev_info(&pdev->dev,
        "Found new IOA(%x:%x), Total IOA count: %d\n",
         pdev->vendor, pdev->device,
         atomic_read(&pmcraid_adapter_count));

    rc = pci_request_regions(pdev, PMCRAID_DRIVER_NAME);

    if (rc < 0) {
        dev_err(&pdev->dev,
            "Couldn't register memory range of registers\n");
        goto out_disable_device;
    }

    mapped_pci_addr = pci_iomap(pdev, 0, 0);

    if (!mapped_pci_addr) {
        dev_err(&pdev->dev, "Couldn't map PCI registers memory\n");
        rc = -ENOMEM;
        goto out_release_regions;
    }

    pci_set_master(pdev);

    /* Firmware requires the system bus address of IOARCB to be within
     * 32-bit addressable range though it has 64-bit IOARRIN register.
     * However, firmware supports 64-bit streaming DMA buffers, whereas
     * coherent buffers are to be 32-bit. Since pci_alloc_consistent always
     * returns memory within 4GB (if not, change this logic), coherent
     * buffers are within firmware acceptable address ranges.
     */
    if ((sizeof(dma_addr_t) == 4) ||
        pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
        rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));

    /* firmware expects 32-bit DMA addresses for IOARRIN register; set 32
     * bit mask for pci_alloc_consistent to return addresses within 4GB
     */
    if (rc == 0)
        rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));

    if (rc != 0) {
        dev_err(&pdev->dev, "Failed to set PCI DMA mask\n");
        goto cleanup_nomem;
    }

    host = scsi_host_alloc(&pmcraid_host_template,
                sizeof(struct pmcraid_instance));

    if (!host) {
        dev_err(&pdev->dev, "scsi_host_alloc failed!\n");
        rc = -ENOMEM;
        goto cleanup_nomem;
    }

    host->max_id = PMCRAID_MAX_NUM_TARGETS_PER_BUS;
    host->max_lun = PMCRAID_MAX_NUM_LUNS_PER_TARGET;
    host->unique_id = host->host_no;
    host->max_channel = PMCRAID_MAX_BUS_TO_SCAN;
    host->max_cmd_len = PMCRAID_MAX_CDB_LEN;

    /* zero out entire instance structure */
    pinstance = (struct pmcraid_instance *)host->hostdata;
    memset(pinstance, 0, sizeof(*pinstance));

    pinstance->chip_cfg =
        (struct pmcraid_chip_details *)(dev_id->driver_data);

    rc = pmcraid_init_instance(pdev, host, mapped_pci_addr);

    if (rc < 0) {
        dev_err(&pdev->dev, "failed to initialize adapter instance\n");
        goto out_scsi_host_put;
    }

    pci_set_drvdata(pdev, pinstance);

    /* Save PCI config-space for use following the reset */
    rc = pci_save_state(pinstance->pdev);

    if (rc != 0) {
        dev_err(&pdev->dev, "Failed to save PCI config space\n");
        goto out_scsi_host_put;
    }

    pmcraid_disable_interrupts(pinstance, ~0);

    rc = pmcraid_register_interrupt_handler(pinstance);

    if (rc) {
        dev_err(&pdev->dev, "couldn't register interrupt handler\n");
        goto out_scsi_host_put;
    }

    pmcraid_init_tasklets(pinstance);

    /* allocate verious buffers used by LLD.*/
    rc = pmcraid_init_buffers(pinstance);

    if (rc) {
        pmcraid_err("couldn't allocate memory blocks\n");
        goto out_unregister_isr;
    }

    /* check the reset type required */
    pmcraid_reset_type(pinstance);

    pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);

    /* Start IOA firmware initialization and bring card to Operational
     * state.
     */
    pmcraid_info("starting IOA initialization sequence\n");
    if (pmcraid_reset_bringup(pinstance)) {
        dev_err(&pdev->dev, "couldn't initialize IOA\n");
        rc = 1;
        goto out_release_bufs;
    }

    /* Add adapter instance into mid-layer list */
    rc = scsi_add_host(pinstance->host, &pdev->dev);
    if (rc != 0) {
        pmcraid_err("couldn't add host into mid-layer: %d\n", rc);
        goto out_release_bufs;
    }

    scsi_scan_host(pinstance->host);

    rc = pmcraid_setup_chrdev(pinstance);

    if (rc != 0) {
        pmcraid_err("couldn't create mgmt interface, error: %x\n",
                 rc);
        goto out_remove_host;
    }

    /* Schedule worker thread to handle CCN and take care of adding and
     * removing devices to OS
     */
    atomic_set(&pinstance->expose_resources, 1);
    schedule_work(&pinstance->worker_q);
    return rc;

out_remove_host:
    scsi_remove_host(host);

out_release_bufs:
    pmcraid_release_buffers(pinstance);

out_unregister_isr:
    pmcraid_kill_tasklets(pinstance);
    pmcraid_unregister_interrupt_handler(pinstance);

out_scsi_host_put:
    scsi_host_put(host);

cleanup_nomem:
    iounmap(mapped_pci_addr);

out_release_regions:
    pci_release_regions(pdev);

out_disable_device:
    atomic_dec(&pmcraid_adapter_count);
    pci_set_drvdata(pdev, NULL);
    pci_disable_device(pdev);
    return -ENODEV;
}

/*
 * PCI driver structure of pcmraid driver
 */
static struct pci_driver pmcraid_driver = {
    .name = PMCRAID_DRIVER_NAME,
    .id_table = pmcraid_pci_table,
    .probe = pmcraid_probe,
    .remove = pmcraid_remove,
    .suspend = pmcraid_suspend,
    .resume = pmcraid_resume,
    .shutdown = pmcraid_shutdown
};

static int __init pmcraid_init(void)
{
    dev_t dev;
    int error;

    pmcraid_info("%s Device Driver version: %s\n",
             PMCRAID_DRIVER_NAME, PMCRAID_DRIVER_VERSION);

    error = alloc_chrdev_region(&dev, 0,
                    PMCRAID_MAX_ADAPTERS,
                    PMCRAID_DEVFILE);

    if (error) {
        pmcraid_err("failed to get a major number for adapters\n");
        goto out_init;
    }

    pmcraid_major = MAJOR(dev);
    pmcraid_class = class_create(THIS_MODULE, PMCRAID_DEVFILE);

    if (IS_ERR(pmcraid_class)) {
        error = PTR_ERR(pmcraid_class);
        pmcraid_err("failed to register with with sysfs, error = %x\n",
                error);
        goto out_unreg_chrdev;
    }

    error = pmcraid_netlink_init();

    if (error)
        goto out_unreg_chrdev;

    error = pci_register_driver(&pmcraid_driver);

    if (error == 0)
        goto out_init;

    pmcraid_err("failed to register pmcraid driver, error = %x\n",
             error);
    class_destroy(pmcraid_class);
    pmcraid_netlink_release();

out_unreg_chrdev:
    unregister_chrdev_region(MKDEV(pmcraid_major, 0), PMCRAID_MAX_ADAPTERS);

out_init:
    return error;
}

static void __exit pmcraid_exit(void)
{
    pmcraid_netlink_release();
    unregister_chrdev_region(MKDEV(pmcraid_major, 0),
                 PMCRAID_MAX_ADAPTERS);
    pci_unregister_driver(&pmcraid_driver);
    class_destroy(pmcraid_class);
}

module_init(pmcraid_init);
module_exit(pmcraid_exit);