/*
 * This is the Fusion MPT base driver providing common API layer interface
 * for access to MPT (Message Passing Technology) firmware.
 *
 * This code is based on drivers/scsi/mpt2sas/mpt2_base.c
 * Copyright (C) 2007-2010  LSI Corporation
 *  (mailto:DL-MPTFusionLinux@lsi.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * 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.
 *
 * NO WARRANTY
 * THE PROGRAM IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR
 * CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT
 * LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT,
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Each Recipient is
 * solely responsible for determining the appropriateness of using and
 * distributing the Program and assumes all risks associated with its
 * exercise of rights under this Agreement, including but not limited to
 * the risks and costs of program errors, damage to or loss of data,
 * programs or equipment, and unavailability or interruption of operations.

 * DISCLAIMER OF LIABILITY
 * NEITHER RECIPIENT NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 * USE OR DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS GRANTED
 * HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES

 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 */

#include <linux/version.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/kdev_t.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/sort.h>
#include <linux/io.h>
#include <linux/time.h>
#include <linux/aer.h>

#include "mpt2sas_base.h"

static MPT_CALLBACK     mpt_callbacks[MPT_MAX_CALLBACKS];

#define FAULT_POLLING_INTERVAL 1000 /* in milliseconds */
#define MPT2SAS_MAX_REQUEST_QUEUE 600 /* maximum controller queue depth */

static int max_queue_depth = -1;
module_param(max_queue_depth, int, 0);
MODULE_PARM_DESC(max_queue_depth, " max controller queue depth ");

static int max_sgl_entries = -1;
module_param(max_sgl_entries, int, 0);
MODULE_PARM_DESC(max_sgl_entries, " max sg entries ");

static int msix_disable = -1;
module_param(msix_disable, int, 0);
MODULE_PARM_DESC(msix_disable, " disable msix routed interrupts (default=0)");

/* diag_buffer_enable is bitwise
 * bit 0 set = TRACE
 * bit 1 set = SNAPSHOT
 * bit 2 set = EXTENDED
 *
 * Either bit can be set, or both
 */
static int diag_buffer_enable;
module_param(diag_buffer_enable, int, 0);
MODULE_PARM_DESC(diag_buffer_enable, " post diag buffers "
    "(TRACE=1/SNAPSHOT=2/EXTENDED=4/default=0)");

int mpt2sas_fwfault_debug;
MODULE_PARM_DESC(mpt2sas_fwfault_debug, " enable detection of firmware fault "
    "and halt firmware - (default=0)");

/**
 * _scsih_set_fwfault_debug - global setting of ioc->fwfault_debug.
 *
 */
static int
_scsih_set_fwfault_debug(const char *val, struct kernel_param *kp)
{
        int ret = param_set_int(val, kp);
        struct MPT2SAS_ADAPTER *ioc;

        if (ret)
                return ret;

        printk(KERN_INFO "setting fwfault_debug(%d)\n", mpt2sas_fwfault_debug);
        list_for_each_entry(ioc, &mpt2sas_ioc_list, list)
                ioc->fwfault_debug = mpt2sas_fwfault_debug;
        return 0;
}
module_param_call(mpt2sas_fwfault_debug, _scsih_set_fwfault_debug,
    param_get_int, &mpt2sas_fwfault_debug, 0644);

/**
 * _base_fault_reset_work - workq handling ioc fault conditions
 * @work: input argument, used to derive ioc
 * Context: sleep.
 *
 * Return nothing.
 */
static void
_base_fault_reset_work(struct work_struct *work)
{
        struct MPT2SAS_ADAPTER *ioc =
            container_of(work, struct MPT2SAS_ADAPTER, fault_reset_work.work);
        unsigned long    flags;
        u32 doorbell;
        int rc;

        spin_lock_irqsave(&ioc->ioc_reset_in_progress_lock, flags);
        if (ioc->shost_recovery)
                goto rearm_timer;
        spin_unlock_irqrestore(&ioc->ioc_reset_in_progress_lock, flags);

        doorbell = mpt2sas_base_get_iocstate(ioc, 0);
        if ((doorbell & MPI2_IOC_STATE_MASK) == MPI2_IOC_STATE_FAULT) {
                rc = mpt2sas_base_hard_reset_handler(ioc, CAN_SLEEP,
                    FORCE_BIG_HAMMER);
                printk(MPT2SAS_WARN_FMT "%s: hard reset: %s\n", ioc->name,
                    __func__, (rc == 0) ? "success" : "failed");
                doorbell = mpt2sas_base_get_iocstate(ioc, 0);
                if ((doorbell & MPI2_IOC_STATE_MASK) == MPI2_IOC_STATE_FAULT)
                        mpt2sas_base_fault_info(ioc, doorbell &
                            MPI2_DOORBELL_DATA_MASK);
        }

        spin_lock_irqsave(&ioc->ioc_reset_in_progress_lock, flags);
 rearm_timer:
        if (ioc->fault_reset_work_q)
                queue_delayed_work(ioc->fault_reset_work_q,
                    &ioc->fault_reset_work,
                    msecs_to_jiffies(FAULT_POLLING_INTERVAL));
        spin_unlock_irqrestore(&ioc->ioc_reset_in_progress_lock, flags);
}

/**
 * mpt2sas_base_start_watchdog - start the fault_reset_work_q
 * @ioc: per adapter object
 * Context: sleep.
 *
 * Return nothing.
 */
void
mpt2sas_base_start_watchdog(struct MPT2SAS_ADAPTER *ioc)
{
        unsigned long    flags;

        if (ioc->fault_reset_work_q)
                return;

        /* initialize fault polling */
        INIT_DELAYED_WORK(&ioc->fault_reset_work, _base_fault_reset_work);
        snprintf(ioc->fault_reset_work_q_name,
            sizeof(ioc->fault_reset_work_q_name), "poll_%d_status", ioc->id);
        ioc->fault_reset_work_q =
                create_singlethread_workqueue(ioc->fault_reset_work_q_name);
        if (!ioc->fault_reset_work_q) {
                printk(MPT2SAS_ERR_FMT "%s: failed (line=%d)\n",
                    ioc->name, __func__, __LINE__);
                        return;
        }
        spin_lock_irqsave(&ioc->ioc_reset_in_progress_lock, flags);
        if (ioc->fault_reset_work_q)
                queue_delayed_work(ioc->fault_reset_work_q,
                    &ioc->fault_reset_work,
                    msecs_to_jiffies(FAULT_POLLING_INTERVAL));
        spin_unlock_irqrestore(&ioc->ioc_reset_in_progress_lock, flags);
}

/**
 * mpt2sas_base_stop_watchdog - stop the fault_reset_work_q
 * @ioc: per adapter object
 * Context: sleep.
 *
 * Return nothing.
 */
void
mpt2sas_base_stop_watchdog(struct MPT2SAS_ADAPTER *ioc)
{
        unsigned long    flags;
        struct workqueue_struct *wq;

        spin_lock_irqsave(&ioc->ioc_reset_in_progress_lock, flags);
        wq = ioc->fault_reset_work_q;
        ioc->fault_reset_work_q = NULL;
        spin_unlock_irqrestore(&ioc->ioc_reset_in_progress_lock, flags);
        if (wq) {
                if (!cancel_delayed_work(&ioc->fault_reset_work))
                        flush_workqueue(wq);
                destroy_workqueue(wq);
        }
}

/**
 * mpt2sas_base_fault_info - verbose translation of firmware FAULT code
 * @ioc: per adapter object
 * @fault_code: fault code
 *
 * Return nothing.
 */
void
mpt2sas_base_fault_info(struct MPT2SAS_ADAPTER *ioc , u16 fault_code)
{
        printk(MPT2SAS_ERR_FMT "fault_state(0x%04x)!\n",
            ioc->name, fault_code);
}

/**
 * mpt2sas_halt_firmware - halt's mpt controller firmware
 * @ioc: per adapter object
 *
 * For debugging timeout related issues.  Writing 0xCOFFEE00
 * to the doorbell register will halt controller firmware. With
 * the purpose to stop both driver and firmware, the enduser can
 * obtain a ring buffer from controller UART.
 */
void
mpt2sas_halt_firmware(struct MPT2SAS_ADAPTER *ioc)
{
        u32 doorbell;

        if (!ioc->fwfault_debug)
                return;

        dump_stack();

        doorbell = readl(&ioc->chip->Doorbell);
        if ((doorbell & MPI2_IOC_STATE_MASK) == MPI2_IOC_STATE_FAULT)
                mpt2sas_base_fault_info(ioc , doorbell);
        else {
                writel(0xC0FFEE00, &ioc->chip->Doorbell);
                printk(MPT2SAS_ERR_FMT "Firmware is halted due to command "
                    "timeout\n", ioc->name);
        }

        panic("panic in %s\n", __func__);
}

#ifdef CONFIG_SCSI_MPT2SAS_LOGGING
/**
 * _base_sas_ioc_info - verbose translation of the ioc status
 * @ioc: per adapter object
 * @mpi_reply: reply mf payload returned from firmware
 * @request_hdr: request mf
 *
 * Return nothing.
 */
static void
_base_sas_ioc_info(struct MPT2SAS_ADAPTER *ioc, MPI2DefaultReply_t *mpi_reply,
     MPI2RequestHeader_t *request_hdr)
{
        u16 ioc_status = le16_to_cpu(mpi_reply->IOCStatus) &
            MPI2_IOCSTATUS_MASK;
        char *desc = NULL;
        u16 frame_sz;
        char *func_str = NULL;

        /* SCSI_IO, RAID_PASS are handled from _scsih_scsi_ioc_info */
        if (request_hdr->Function == MPI2_FUNCTION_SCSI_IO_REQUEST ||
            request_hdr->Function == MPI2_FUNCTION_RAID_SCSI_IO_PASSTHROUGH ||
            request_hdr->Function == MPI2_FUNCTION_EVENT_NOTIFICATION)
                return;

        if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
                return;

        switch (ioc_status) {

/****************************************************************************
*  Common IOCStatus values for all replies
****************************************************************************/

        case MPI2_IOCSTATUS_INVALID_FUNCTION:
                desc = "invalid function";
                break;
        case MPI2_IOCSTATUS_BUSY:
                desc = "busy";
                break;
        case MPI2_IOCSTATUS_INVALID_SGL:
                desc = "invalid sgl";
                break;
        case MPI2_IOCSTATUS_INTERNAL_ERROR:
                desc = "internal error";
                break;
        case MPI2_IOCSTATUS_INVALID_VPID:
                desc = "invalid vpid";
                break;
        case MPI2_IOCSTATUS_INSUFFICIENT_RESOURCES:
                desc = "insufficient resources";
                break;
        case MPI2_IOCSTATUS_INVALID_FIELD:
                desc = "invalid field";
                break;
        case MPI2_IOCSTATUS_INVALID_STATE:
                desc = "invalid state";
                break;
        case MPI2_IOCSTATUS_OP_STATE_NOT_SUPPORTED:
                desc = "op state not supported";
                break;

/****************************************************************************
*  Config IOCStatus values
****************************************************************************/

        case MPI2_IOCSTATUS_CONFIG_INVALID_ACTION:
                desc = "config invalid action";
                break;
        case MPI2_IOCSTATUS_CONFIG_INVALID_TYPE:
                desc = "config invalid type";
                break;
        case MPI2_IOCSTATUS_CONFIG_INVALID_PAGE:
                desc = "config invalid page";
                break;
        case MPI2_IOCSTATUS_CONFIG_INVALID_DATA:
                desc = "config invalid data";
                break;
        case MPI2_IOCSTATUS_CONFIG_NO_DEFAULTS:
                desc = "config no defaults";
                break;
        case MPI2_IOCSTATUS_CONFIG_CANT_COMMIT:
                desc = "config cant commit";
                break;

/****************************************************************************
*  SCSI IO Reply
****************************************************************************/

        case MPI2_IOCSTATUS_SCSI_RECOVERED_ERROR:
        case MPI2_IOCSTATUS_SCSI_INVALID_DEVHANDLE:
        case MPI2_IOCSTATUS_SCSI_DEVICE_NOT_THERE:
        case MPI2_IOCSTATUS_SCSI_DATA_OVERRUN:
        case MPI2_IOCSTATUS_SCSI_DATA_UNDERRUN:
        case MPI2_IOCSTATUS_SCSI_IO_DATA_ERROR:
        case MPI2_IOCSTATUS_SCSI_PROTOCOL_ERROR:
        case MPI2_IOCSTATUS_SCSI_TASK_TERMINATED:
        case MPI2_IOCSTATUS_SCSI_RESIDUAL_MISMATCH:
        case MPI2_IOCSTATUS_SCSI_TASK_MGMT_FAILED:
        case MPI2_IOCSTATUS_SCSI_IOC_TERMINATED:
        case MPI2_IOCSTATUS_SCSI_EXT_TERMINATED:
                break;

/****************************************************************************
*  For use by SCSI Initiator and SCSI Target end-to-end data protection
****************************************************************************/

        case MPI2_IOCSTATUS_EEDP_GUARD_ERROR:
                desc = "eedp guard error";
                break;
        case MPI2_IOCSTATUS_EEDP_REF_TAG_ERROR:
                desc = "eedp ref tag error";
                break;
        case MPI2_IOCSTATUS_EEDP_APP_TAG_ERROR:
                desc = "eedp app tag error";
                break;

/****************************************************************************
*  SCSI Target values
****************************************************************************/

        case MPI2_IOCSTATUS_TARGET_INVALID_IO_INDEX:
                desc = "target invalid io index";
                break;
        case MPI2_IOCSTATUS_TARGET_ABORTED:
                desc = "target aborted";
                break;
        case MPI2_IOCSTATUS_TARGET_NO_CONN_RETRYABLE:
                desc = "target no conn retryable";
                break;
        case MPI2_IOCSTATUS_TARGET_NO_CONNECTION:
                desc = "target no connection";
                break;
        case MPI2_IOCSTATUS_TARGET_XFER_COUNT_MISMATCH:
                desc = "target xfer count mismatch";
                break;
        case MPI2_IOCSTATUS_TARGET_DATA_OFFSET_ERROR:
                desc = "target data offset error";
                break;
        case MPI2_IOCSTATUS_TARGET_TOO_MUCH_WRITE_DATA:
                desc = "target too much write data";
                break;
        case MPI2_IOCSTATUS_TARGET_IU_TOO_SHORT:
                desc = "target iu too short";
                break;
        case MPI2_IOCSTATUS_TARGET_ACK_NAK_TIMEOUT:
                desc = "target ack nak timeout";
                break;
        case MPI2_IOCSTATUS_TARGET_NAK_RECEIVED:
                desc = "target nak received";
                break;

/****************************************************************************
*  Serial Attached SCSI values
****************************************************************************/

        case MPI2_IOCSTATUS_SAS_SMP_REQUEST_FAILED:
                desc = "smp request failed";
                break;
        case MPI2_IOCSTATUS_SAS_SMP_DATA_OVERRUN:
                desc = "smp data overrun";
                break;

/****************************************************************************
*  Diagnostic Buffer Post / Diagnostic Release values
****************************************************************************/

        case MPI2_IOCSTATUS_DIAGNOSTIC_RELEASED:
                desc = "diagnostic released";
                break;
        default:
                break;
        }

        if (!desc)
                return;

        switch (request_hdr->Function) {
        case MPI2_FUNCTION_CONFIG:
                frame_sz = sizeof(Mpi2ConfigRequest_t) + ioc->sge_size;
                func_str = "config_page";
                break;
        case MPI2_FUNCTION_SCSI_TASK_MGMT:
                frame_sz = sizeof(Mpi2SCSITaskManagementRequest_t);
                func_str = "task_mgmt";
                break;
        case MPI2_FUNCTION_SAS_IO_UNIT_CONTROL:
                frame_sz = sizeof(Mpi2SasIoUnitControlRequest_t);
                func_str = "sas_iounit_ctl";
                break;
        case MPI2_FUNCTION_SCSI_ENCLOSURE_PROCESSOR:
                frame_sz = sizeof(Mpi2SepRequest_t);
                func_str = "enclosure";
                break;
        case MPI2_FUNCTION_IOC_INIT:
                frame_sz = sizeof(Mpi2IOCInitRequest_t);
                func_str = "ioc_init";
                break;
        case MPI2_FUNCTION_PORT_ENABLE:
                frame_sz = sizeof(Mpi2PortEnableRequest_t);
                func_str = "port_enable";
                break;
        case MPI2_FUNCTION_SMP_PASSTHROUGH:
                frame_sz = sizeof(Mpi2SmpPassthroughRequest_t) + ioc->sge_size;
                func_str = "smp_passthru";
                break;
        default:
                frame_sz = 32;
                func_str = "unknown";
                break;
        }

        printk(MPT2SAS_WARN_FMT "ioc_status: %s(0x%04x), request(0x%p),"
            " (%s)\n", ioc->name, desc, ioc_status, request_hdr, func_str);

        _debug_dump_mf(request_hdr, frame_sz/4);
}

/**
 * _base_display_event_data - verbose translation of firmware asyn events
 * @ioc: per adapter object
 * @mpi_reply: reply mf payload returned from firmware
 *
 * Return nothing.
 */
static void
_base_display_event_data(struct MPT2SAS_ADAPTER *ioc,
    Mpi2EventNotificationReply_t *mpi_reply)
{
        char *desc = NULL;
        u16 event;

        if (!(ioc->logging_level & MPT_DEBUG_EVENTS))
                return;

        event = le16_to_cpu(mpi_reply->Event);

        switch (event) {
        case MPI2_EVENT_LOG_DATA:
                desc = "Log Data";
                break;
        case MPI2_EVENT_STATE_CHANGE:
                desc = "Status Change";
                break;
        case MPI2_EVENT_HARD_RESET_RECEIVED:
                desc = "Hard Reset Received";
                break;
        case MPI2_EVENT_EVENT_CHANGE:
                desc = "Event Change";
                break;
        case MPI2_EVENT_TASK_SET_FULL:
                desc = "Task Set Full";
                break;
        case MPI2_EVENT_SAS_DEVICE_STATUS_CHANGE:
                desc = "Device Status Change";
                break;
        case MPI2_EVENT_IR_OPERATION_STATUS:
                desc = "IR Operation Status";
                break;
        case MPI2_EVENT_SAS_DISCOVERY:
        {
                Mpi2EventDataSasDiscovery_t *event_data =
                    (Mpi2EventDataSasDiscovery_t *)mpi_reply->EventData;
                printk(MPT2SAS_INFO_FMT "Discovery: (%s)", ioc->name,
                    (event_data->ReasonCode == MPI2_EVENT_SAS_DISC_RC_STARTED) ?
                    "start" : "stop");
                if (event_data->DiscoveryStatus)
                        printk("discovery_status(0x%08x)",
                            le32_to_cpu(event_data->DiscoveryStatus));
                        printk("\n");
                return;
        }
        case MPI2_EVENT_SAS_BROADCAST_PRIMITIVE:
                desc = "SAS Broadcast Primitive";
                break;
        case MPI2_EVENT_SAS_INIT_DEVICE_STATUS_CHANGE:
                desc = "SAS Init Device Status Change";
                break;
        case MPI2_EVENT_SAS_INIT_TABLE_OVERFLOW:
                desc = "SAS Init Table Overflow";
                break;
        case MPI2_EVENT_SAS_TOPOLOGY_CHANGE_LIST:
                desc = "SAS Topology Change List";
                break;
        case MPI2_EVENT_SAS_ENCL_DEVICE_STATUS_CHANGE:
                desc = "SAS Enclosure Device Status Change";
                break;
        case MPI2_EVENT_IR_VOLUME:
                desc = "IR Volume";
                break;
        case MPI2_EVENT_IR_PHYSICAL_DISK:
                desc = "IR Physical Disk";
                break;
        case MPI2_EVENT_IR_CONFIGURATION_CHANGE_LIST:
                desc = "IR Configuration Change List";
                break;
        case MPI2_EVENT_LOG_ENTRY_ADDED:
                desc = "Log Entry Added";
                break;
        }

        if (!desc)
                return;

        printk(MPT2SAS_INFO_FMT "%s\n", ioc->name, desc);
}
#endif

/**
 * _base_sas_log_info - verbose translation of firmware log info
 * @ioc: per adapter object
 * @log_info: log info
 *
 * Return nothing.
 */
static void
_base_sas_log_info(struct MPT2SAS_ADAPTER *ioc , u32 log_info)
{
        union loginfo_type {
                u32     loginfo;
                struct {
                        u32     subcode:16;
                        u32     code:8;
                        u32     originator:4;
                        u32     bus_type:4;
                } dw;
        };
        union loginfo_type sas_loginfo;
        char *originator_str = NULL;

        sas_loginfo.loginfo = log_info;
        if (sas_loginfo.dw.bus_type != 3 /*SAS*/)
                return;

        /* each nexus loss loginfo */
        if (log_info == 0x31170000)
                return;

        /* eat the loginfos associated with task aborts */
        if (ioc->ignore_loginfos && (log_info == 30050000 || log_info ==
            0x31140000 || log_info == 0x31130000))
                return;

        switch (sas_loginfo.dw.originator) {
        case 0:
                originator_str = "IOP";
                break;
        case 1:
                originator_str = "PL";
                break;
        case 2:
                originator_str = "IR";
                break;
        }

        printk(MPT2SAS_WARN_FMT "log_info(0x%08x): originator(%s), "
            "code(0x%02x), sub_code(0x%04x)\n", ioc->name, log_info,
             originator_str, sas_loginfo.dw.code,
             sas_loginfo.dw.subcode);
}

/**
 * _base_display_reply_info -
 * @ioc: per adapter object
 * @smid: system request message index
 * @msix_index: MSIX table index supplied by the OS
 * @reply: reply message frame(lower 32bit addr)
 *
 * Return nothing.
 */
static void
_base_display_reply_info(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index,
    u32 reply)
{
        MPI2DefaultReply_t *mpi_reply;
        u16 ioc_status;

        mpi_reply = mpt2sas_base_get_reply_virt_addr(ioc, reply);
        ioc_status = le16_to_cpu(mpi_reply->IOCStatus);
#ifdef CONFIG_SCSI_MPT2SAS_LOGGING
        if ((ioc_status & MPI2_IOCSTATUS_MASK) &&
            (ioc->logging_level & MPT_DEBUG_REPLY)) {
                _base_sas_ioc_info(ioc , mpi_reply,
                   mpt2sas_base_get_msg_frame(ioc, smid));
        }
#endif
        if (ioc_status & MPI2_IOCSTATUS_FLAG_LOG_INFO_AVAILABLE)
                _base_sas_log_info(ioc, le32_to_cpu(mpi_reply->IOCLogInfo));
}

/**
 * mpt2sas_base_done - base internal command completion routine
 * @ioc: per adapter object
 * @smid: system request message index
 * @msix_index: MSIX table index supplied by the OS
 * @reply: reply message frame(lower 32bit addr)
 *
 * Return 1 meaning mf should be freed from _base_interrupt
 *        0 means the mf is freed from this function.
 */
u8
mpt2sas_base_done(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index,
    u32 reply)
{
        MPI2DefaultReply_t *mpi_reply;

        mpi_reply = mpt2sas_base_get_reply_virt_addr(ioc, reply);
        if (mpi_reply && mpi_reply->Function == MPI2_FUNCTION_EVENT_ACK)
                return 1;

        if (ioc->base_cmds.status == MPT2_CMD_NOT_USED)
                return 1;

        ioc->base_cmds.status |= MPT2_CMD_COMPLETE;
        if (mpi_reply) {
                ioc->base_cmds.status |= MPT2_CMD_REPLY_VALID;
                memcpy(ioc->base_cmds.reply, mpi_reply, mpi_reply->MsgLength*4);
        }
        ioc->base_cmds.status &= ~MPT2_CMD_PENDING;
        complete(&ioc->base_cmds.done);
        return 1;
}

/**
 * _base_async_event - main callback handler for firmware asyn events
 * @ioc: per adapter object
 * @msix_index: MSIX table index supplied by the OS
 * @reply: reply message frame(lower 32bit addr)
 *
 * Return 1 meaning mf should be freed from _base_interrupt
 *        0 means the mf is freed from this function.
 */
static u8
_base_async_event(struct MPT2SAS_ADAPTER *ioc, u8 msix_index, u32 reply)
{
        Mpi2EventNotificationReply_t *mpi_reply;
        Mpi2EventAckRequest_t *ack_request;
        u16 smid;

        mpi_reply = mpt2sas_base_get_reply_virt_addr(ioc, reply);
        if (!mpi_reply)
                return 1;
        if (mpi_reply->Function != MPI2_FUNCTION_EVENT_NOTIFICATION)
                return 1;
#ifdef CONFIG_SCSI_MPT2SAS_LOGGING
        _base_display_event_data(ioc, mpi_reply);
#endif
        if (!(mpi_reply->AckRequired & MPI2_EVENT_NOTIFICATION_ACK_REQUIRED))
                goto out;
        smid = mpt2sas_base_get_smid(ioc, ioc->base_cb_idx);
        if (!smid) {
                printk(MPT2SAS_ERR_FMT "%s: failed obtaining a smid\n",
                    ioc->name, __func__);
                goto out;
        }

        ack_request = mpt2sas_base_get_msg_frame(ioc, smid);
        memset(ack_request, 0, sizeof(Mpi2EventAckRequest_t));
        ack_request->Function = MPI2_FUNCTION_EVENT_ACK;
        ack_request->Event = mpi_reply->Event;
        ack_request->EventContext = mpi_reply->EventContext;
        ack_request->VF_ID = 0;  /* TODO */
        ack_request->VP_ID = 0;
        mpt2sas_base_put_smid_default(ioc, smid);

 out:

        /* scsih callback handler */
        mpt2sas_scsih_event_callback(ioc, msix_index, reply);

        /* ctl callback handler */
        mpt2sas_ctl_event_callback(ioc, msix_index, reply);

        return 1;
}

/**
 * _base_get_cb_idx - obtain the callback index
 * @ioc: per adapter object
 * @smid: system request message index
 *
 * Return callback index.
 */
static u8
_base_get_cb_idx(struct MPT2SAS_ADAPTER *ioc, u16 smid)
{
        int i;
        u8 cb_idx = 0xFF;

        if (smid >= ioc->hi_priority_smid) {
                if (smid < ioc->internal_smid) {
                        i = smid - ioc->hi_priority_smid;
                        cb_idx = ioc->hpr_lookup[i].cb_idx;
                } else {
                        i = smid - ioc->internal_smid;
                        cb_idx = ioc->internal_lookup[i].cb_idx;
                }
        } else {
                i = smid - 1;
                cb_idx = ioc->scsi_lookup[i].cb_idx;
        }
        return cb_idx;
}

/**
 * _base_mask_interrupts - disable interrupts
 * @ioc: per adapter object
 *
 * Disabling ResetIRQ, Reply and Doorbell Interrupts
 *
 * Return nothing.
 */
static void
_base_mask_interrupts(struct MPT2SAS_ADAPTER *ioc)
{
        u32 him_register;

        ioc->mask_interrupts = 1;
        him_register = readl(&ioc->chip->HostInterruptMask);
        him_register |= MPI2_HIM_DIM + MPI2_HIM_RIM + MPI2_HIM_RESET_IRQ_MASK;
        writel(him_register, &ioc->chip->HostInterruptMask);
        readl(&ioc->chip->HostInterruptMask);
}

/**
 * _base_unmask_interrupts - enable interrupts
 * @ioc: per adapter object
 *
 * Enabling only Reply Interrupts
 *
 * Return nothing.
 */
static void
_base_unmask_interrupts(struct MPT2SAS_ADAPTER *ioc)
{
        u32 him_register;

        him_register = readl(&ioc->chip->HostInterruptMask);
        him_register &= ~MPI2_HIM_RIM;
        writel(him_register, &ioc->chip->HostInterruptMask);
        ioc->mask_interrupts = 0;
}

union reply_descriptor {
        u64 word;
        struct {
                u32 low;
                u32 high;
        } u;
};

/**
 * _base_interrupt - MPT adapter (IOC) specific interrupt handler.
 * @irq: irq number (not used)
 * @bus_id: bus identifier cookie == pointer to MPT_ADAPTER structure
 * @r: pt_regs pointer (not used)
 *
 * Return IRQ_HANDLE if processed, else IRQ_NONE.
 */
static irqreturn_t
_base_interrupt(int irq, void *bus_id)
{
        union reply_descriptor rd;
        u32 completed_cmds;
        u8 request_desript_type;
        u16 smid;
        u8 cb_idx;
        u32 reply;
        u8 msix_index;
        struct MPT2SAS_ADAPTER *ioc = bus_id;
        Mpi2ReplyDescriptorsUnion_t *rpf;
        u8 rc;

        if (ioc->mask_interrupts)
                return IRQ_NONE;

        rpf = &ioc->reply_post_free[ioc->reply_post_host_index];
        request_desript_type = rpf->Default.ReplyFlags
             & MPI2_RPY_DESCRIPT_FLAGS_TYPE_MASK;
        if (request_desript_type == MPI2_RPY_DESCRIPT_FLAGS_UNUSED)
                return IRQ_NONE;

        completed_cmds = 0;
        do {
                rd.word = rpf->Words;
                if (rd.u.low == UINT_MAX || rd.u.high == UINT_MAX)
                        goto out;
                reply = 0;
                cb_idx = 0xFF;
                smid = le16_to_cpu(rpf->Default.DescriptorTypeDependent1);
                msix_index = rpf->Default.MSIxIndex;
                if (request_desript_type ==
                    MPI2_RPY_DESCRIPT_FLAGS_ADDRESS_REPLY) {
                        reply = le32_to_cpu
                                (rpf->AddressReply.ReplyFrameAddress);
                } else if (request_desript_type ==
                    MPI2_RPY_DESCRIPT_FLAGS_TARGET_COMMAND_BUFFER)
                        goto next;
                else if (request_desript_type ==
                    MPI2_RPY_DESCRIPT_FLAGS_TARGETASSIST_SUCCESS)
                        goto next;
                if (smid)
                        cb_idx = _base_get_cb_idx(ioc, smid);
                if (smid && cb_idx != 0xFF) {
                        rc = mpt_callbacks[cb_idx](ioc, smid, msix_index,
                            reply);
                        if (reply)
                                _base_display_reply_info(ioc, smid, msix_index,
                                    reply);
                        if (rc)
                                mpt2sas_base_free_smid(ioc, smid);
                }
                if (!smid)
                        _base_async_event(ioc, msix_index, reply);

                /* reply free queue handling */
                if (reply) {
                        ioc->reply_free_host_index =
                            (ioc->reply_free_host_index ==
                            (ioc->reply_free_queue_depth - 1)) ?
                            0 : ioc->reply_free_host_index + 1;
                        ioc->reply_free[ioc->reply_free_host_index] =
                            cpu_to_le32(reply);
                        wmb();
                        writel(ioc->reply_free_host_index,
                            &ioc->chip->ReplyFreeHostIndex);
                }

 next:

                rpf->Words = ULLONG_MAX;
                ioc->reply_post_host_index = (ioc->reply_post_host_index ==
                    (ioc->reply_post_queue_depth - 1)) ? 0 :
                    ioc->reply_post_host_index + 1;
                request_desript_type =
                    ioc->reply_post_free[ioc->reply_post_host_index].Default.
                    ReplyFlags & MPI2_RPY_DESCRIPT_FLAGS_TYPE_MASK;
                completed_cmds++;
                if (request_desript_type == MPI2_RPY_DESCRIPT_FLAGS_UNUSED)
                        goto out;
                if (!ioc->reply_post_host_index)
                        rpf = ioc->reply_post_free;
                else
                        rpf++;
        } while (1);

 out:

        if (!completed_cmds)
                return IRQ_NONE;

        wmb();
        writel(ioc->reply_post_host_index, &ioc->chip->ReplyPostHostIndex);
        return IRQ_HANDLED;
}

/**
 * mpt2sas_base_release_callback_handler - clear interupt callback handler
 * @cb_idx: callback index
 *
 * Return nothing.
 */
void
mpt2sas_base_release_callback_handler(u8 cb_idx)
{
        mpt_callbacks[cb_idx] = NULL;
}

/**
 * mpt2sas_base_register_callback_handler - obtain index for the interrupt callback handler
 * @cb_func: callback function
 *
 * Returns cb_func.
 */
u8
mpt2sas_base_register_callback_handler(MPT_CALLBACK cb_func)
{
        u8 cb_idx;

        for (cb_idx = MPT_MAX_CALLBACKS-1; cb_idx; cb_idx--)
                if (mpt_callbacks[cb_idx] == NULL)
                        break;

        mpt_callbacks[cb_idx] = cb_func;
        return cb_idx;
}

/**
 * mpt2sas_base_initialize_callback_handler - initialize the interrupt callback handler
 *
 * Return nothing.
 */
void
mpt2sas_base_initialize_callback_handler(void)
{
        u8 cb_idx;

        for (cb_idx = 0; cb_idx < MPT_MAX_CALLBACKS; cb_idx++)
                mpt2sas_base_release_callback_handler(cb_idx);
}

/**
 * mpt2sas_base_build_zero_len_sge - build zero length sg entry
 * @ioc: per adapter object
 * @paddr: virtual address for SGE
 *
 * Create a zero length scatter gather entry to insure the IOCs hardware has
 * something to use if the target device goes brain dead and tries
 * to send data even when none is asked for.
 *
 * Return nothing.
 */
void
mpt2sas_base_build_zero_len_sge(struct MPT2SAS_ADAPTER *ioc, void *paddr)
{
        u32 flags_length = (u32)((MPI2_SGE_FLAGS_LAST_ELEMENT |
            MPI2_SGE_FLAGS_END_OF_BUFFER | MPI2_SGE_FLAGS_END_OF_LIST |
            MPI2_SGE_FLAGS_SIMPLE_ELEMENT) <<
            MPI2_SGE_FLAGS_SHIFT);
        ioc->base_add_sg_single(paddr, flags_length, -1);
}

/**
 * _base_add_sg_single_32 - Place a simple 32 bit SGE at address pAddr.
 * @paddr: virtual address for SGE
 * @flags_length: SGE flags and data transfer length
 * @dma_addr: Physical address
 *
 * Return nothing.
 */
static void
_base_add_sg_single_32(void *paddr, u32 flags_length, dma_addr_t dma_addr)
{
        Mpi2SGESimple32_t *sgel = paddr;

        flags_length |= (MPI2_SGE_FLAGS_32_BIT_ADDRESSING |
            MPI2_SGE_FLAGS_SYSTEM_ADDRESS) << MPI2_SGE_FLAGS_SHIFT;

        sgel->FlagsLength = cpu_to_le32(flags_length);
        sgel->Address = cpu_to_le32(dma_addr);
}


/**
 * _base_add_sg_single_64 - Place a simple 64 bit SGE at address pAddr.
 * @paddr: virtual address for SGE
 * @flags_length: SGE flags and data transfer length
 * @dma_addr: Physical address
 *
 * Return nothing.
 */
static void
_base_add_sg_single_64(void *paddr, u32 flags_length, dma_addr_t dma_addr)
{
        Mpi2SGESimple64_t *sgel = paddr;

        flags_length |= (MPI2_SGE_FLAGS_64_BIT_ADDRESSING |
            MPI2_SGE_FLAGS_SYSTEM_ADDRESS) << MPI2_SGE_FLAGS_SHIFT;
        sgel->FlagsLength = cpu_to_le32(flags_length);
        sgel->Address = cpu_to_le64(dma_addr);
}

#define convert_to_kb(x) ((x) << (PAGE_SHIFT - 10))

/**
 * _base_config_dma_addressing - set dma addressing
 * @ioc: per adapter object
 * @pdev: PCI device struct
 *
 * Returns 0 for success, non-zero for failure.
 */
static int
_base_config_dma_addressing(struct MPT2SAS_ADAPTER *ioc, struct pci_dev *pdev)
{
        struct sysinfo s;
        char *desc = NULL;

        if (sizeof(dma_addr_t) > 4) {
                const uint64_t required_mask =
                    dma_get_required_mask(&pdev->dev);
                if ((required_mask > DMA_BIT_MASK(32)) && !pci_set_dma_mask(pdev,
                    DMA_BIT_MASK(64)) && !pci_set_consistent_dma_mask(pdev,
                    DMA_BIT_MASK(64))) {
                        ioc->base_add_sg_single = &_base_add_sg_single_64;
                        ioc->sge_size = sizeof(Mpi2SGESimple64_t);
                        desc = "64";
                        goto out;
                }
        }

        if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(32))
            && !pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32))) {
                ioc->base_add_sg_single = &_base_add_sg_single_32;
                ioc->sge_size = sizeof(Mpi2SGESimple32_t);
                desc = "32";
        } else
                return -ENODEV;

 out:
        si_meminfo(&s);
        printk(MPT2SAS_INFO_FMT "%s BIT PCI BUS DMA ADDRESSING SUPPORTED, "
            "total mem (%ld kB)\n", ioc->name, desc, convert_to_kb(s.totalram));

        return 0;
}

/**
 * _base_save_msix_table - backup msix vector table
 * @ioc: per adapter object
 *
 * This address an errata where diag reset clears out the table
 */
static void
_base_save_msix_table(struct MPT2SAS_ADAPTER *ioc)
{
        int i;

        if (!ioc->msix_enable || ioc->msix_table_backup == NULL)
                return;

        for (i = 0; i < ioc->msix_vector_count; i++)
                ioc->msix_table_backup[i] = ioc->msix_table[i];
}

/**
 * _base_restore_msix_table - this restores the msix vector table
 * @ioc: per adapter object
 *
 */
static void
_base_restore_msix_table(struct MPT2SAS_ADAPTER *ioc)
{
        int i;

        if (!ioc->msix_enable || ioc->msix_table_backup == NULL)
                return;

        for (i = 0; i < ioc->msix_vector_count; i++)
                ioc->msix_table[i] = ioc->msix_table_backup[i];
}

/**
 * _base_check_enable_msix - checks MSIX capabable.
 * @ioc: per adapter object
 *
 * Check to see if card is capable of MSIX, and set number
 * of avaliable msix vectors
 */
static int
_base_check_enable_msix(struct MPT2SAS_ADAPTER *ioc)
{
        int base;
        u16 message_control;
        u32 msix_table_offset;

        base = pci_find_capability(ioc->pdev, PCI_CAP_ID_MSIX);
        if (!base) {
                dfailprintk(ioc, printk(MPT2SAS_INFO_FMT "msix not "
                    "supported\n", ioc->name));
                return -EINVAL;
        }

        /* get msix vector count */
        pci_read_config_word(ioc->pdev, base + 2, &message_control);
        ioc->msix_vector_count = (message_control & 0x3FF) + 1;

        /* get msix table  */
        pci_read_config_dword(ioc->pdev, base + 4, &msix_table_offset);
        msix_table_offset &= 0xFFFFFFF8;
        ioc->msix_table = (u32 *)((void *)ioc->chip + msix_table_offset);

        dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "msix is supported, "
            "vector_count(%d), table_offset(0x%08x), table(%p)\n", ioc->name,
            ioc->msix_vector_count, msix_table_offset, ioc->msix_table));
        return 0;
}

/**
 * _base_disable_msix - disables msix
 * @ioc: per adapter object
 *
 */
static void
_base_disable_msix(struct MPT2SAS_ADAPTER *ioc)
{
        if (ioc->msix_enable) {
                pci_disable_msix(ioc->pdev);
                kfree(ioc->msix_table_backup);
                ioc->msix_table_backup = NULL;
                ioc->msix_enable = 0;
        }
}

/**
 * _base_enable_msix - enables msix, failback to io_apic
 * @ioc: per adapter object
 *
 */
static int
_base_enable_msix(struct MPT2SAS_ADAPTER *ioc)
{
        struct msix_entry entries;
        int r;
        u8 try_msix = 0;

        if (msix_disable == -1 || msix_disable == 0)
                try_msix = 1;

        if (!try_msix)
                goto try_ioapic;

        if (_base_check_enable_msix(ioc) != 0)
                goto try_ioapic;

        ioc->msix_table_backup = kcalloc(ioc->msix_vector_count,
            sizeof(u32), GFP_KERNEL);
        if (!ioc->msix_table_backup) {
                dfailprintk(ioc, printk(MPT2SAS_INFO_FMT "allocation for "
                    "msix_table_backup failed!!!\n", ioc->name));
                goto try_ioapic;
        }

        memset(&entries, 0, sizeof(struct msix_entry));
        r = pci_enable_msix(ioc->pdev, &entries, 1);
        if (r) {
                dfailprintk(ioc, printk(MPT2SAS_INFO_FMT "pci_enable_msix "
                    "failed (r=%d) !!!\n", ioc->name, r));
                goto try_ioapic;
        }

        r = request_irq(entries.vector, _base_interrupt, IRQF_SHARED,
            ioc->name, ioc);
        if (r) {
                dfailprintk(ioc, printk(MPT2SAS_INFO_FMT "unable to allocate "
                    "interrupt %d !!!\n", ioc->name, entries.vector));
                pci_disable_msix(ioc->pdev);
                goto try_ioapic;
        }

        ioc->pci_irq = entries.vector;
        ioc->msix_enable = 1;
        return 0;

/* failback to io_apic interrupt routing */
 try_ioapic:

        r = request_irq(ioc->pdev->irq, _base_interrupt, IRQF_SHARED,
            ioc->name, ioc);
        if (r) {
                printk(MPT2SAS_ERR_FMT "unable to allocate interrupt %d!\n",
                    ioc->name, ioc->pdev->irq);
                r = -EBUSY;
                goto out_fail;
        }

        ioc->pci_irq = ioc->pdev->irq;
        return 0;

 out_fail:
        return r;
}

/**
 * mpt2sas_base_map_resources - map in controller resources (io/irq/memap)
 * @ioc: per adapter object
 *
 * Returns 0 for success, non-zero for failure.
 */
int
mpt2sas_base_map_resources(struct MPT2SAS_ADAPTER *ioc)
{
        struct pci_dev *pdev = ioc->pdev;
        u32 memap_sz;
        u32 pio_sz;
        int i, r = 0;
        u64 pio_chip = 0;
        u64 chip_phys = 0;

        dinitprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s\n",
            ioc->name, __func__));

        ioc->bars = pci_select_bars(pdev, IORESOURCE_MEM);
        if (pci_enable_device_mem(pdev)) {
                printk(MPT2SAS_WARN_FMT "pci_enable_device_mem: "
                    "failed\n", ioc->name);
                return -ENODEV;
        }


        if (pci_request_selected_regions(pdev, ioc->bars,
            MPT2SAS_DRIVER_NAME)) {
                printk(MPT2SAS_WARN_FMT "pci_request_selected_regions: "
                    "failed\n", ioc->name);
                r = -ENODEV;
                goto out_fail;
        }

        /* AER (Advanced Error Reporting) hooks */
        pci_enable_pcie_error_reporting(pdev);

        pci_set_master(pdev);

        if (_base_config_dma_addressing(ioc, pdev) != 0) {
                printk(MPT2SAS_WARN_FMT "no suitable DMA mask for %s\n",
                    ioc->name, pci_name(pdev));
                r = -ENODEV;
                goto out_fail;
        }

        for (i = 0, memap_sz = 0, pio_sz = 0 ; i < DEVICE_COUNT_RESOURCE; i++) {
                if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
                        if (pio_sz)
                                continue;
                        pio_chip = (u64)pci_resource_start(pdev, i);
                        pio_sz = pci_resource_len(pdev, i);
                } else {
                        if (memap_sz)
                                continue;
                        /* verify memory resource is valid before using */
                        if (pci_resource_flags(pdev, i) & IORESOURCE_MEM) {
                                ioc->chip_phys = pci_resource_start(pdev, i);
                                chip_phys = (u64)ioc->chip_phys;
                                memap_sz = pci_resource_len(pdev, i);
                                ioc->chip = ioremap(ioc->chip_phys, memap_sz);
                                if (ioc->chip == NULL) {
                                        printk(MPT2SAS_ERR_FMT "unable to map "
                                            "adapter memory!\n", ioc->name);
                                        r = -EINVAL;
                                        goto out_fail;
                                }
                        }
                }
        }

        _base_mask_interrupts(ioc);
        r = _base_enable_msix(ioc);
        if (r)
                goto out_fail;

        printk(MPT2SAS_INFO_FMT "%s: IRQ %d\n",
            ioc->name,  ((ioc->msix_enable) ? "PCI-MSI-X enabled" :
            "IO-APIC enabled"), ioc->pci_irq);
        printk(MPT2SAS_INFO_FMT "iomem(0x%016llx), mapped(0x%p), size(%d)\n",
            ioc->name, (unsigned long long)chip_phys, ioc->chip, memap_sz);
        printk(MPT2SAS_INFO_FMT "ioport(0x%016llx), size(%d)\n",
            ioc->name, (unsigned long long)pio_chip, pio_sz);

        return 0;

 out_fail:
        if (ioc->chip_phys)
                iounmap(ioc->chip);
        ioc->chip_phys = 0;
        ioc->pci_irq = -1;
        pci_release_selected_regions(ioc->pdev, ioc->bars);
        pci_disable_pcie_error_reporting(pdev);
        pci_disable_device(pdev);
        return r;
}

/**
 * mpt2sas_base_get_msg_frame - obtain request mf pointer
 * @ioc: per adapter object
 * @smid: system request message index(smid zero is invalid)
 *
 * Returns virt pointer to message frame.
 */
void *
mpt2sas_base_get_msg_frame(struct MPT2SAS_ADAPTER *ioc, u16 smid)
{
        return (void *)(ioc->request + (smid * ioc->request_sz));
}

/**
 * mpt2sas_base_get_sense_buffer - obtain a sense buffer assigned to a mf request
 * @ioc: per adapter object
 * @smid: system request message index
 *
 * Returns virt pointer to sense buffer.
 */
void *
mpt2sas_base_get_sense_buffer(struct MPT2SAS_ADAPTER *ioc, u16 smid)
{
        return (void *)(ioc->sense + ((smid - 1) * SCSI_SENSE_BUFFERSIZE));
}

/**
 * mpt2sas_base_get_sense_buffer_dma - obtain a sense buffer assigned to a mf request
 * @ioc: per adapter object
 * @smid: system request message index
 *
 * Returns phys pointer to the low 32bit address of the sense buffer.
 */
__le32
mpt2sas_base_get_sense_buffer_dma(struct MPT2SAS_ADAPTER *ioc, u16 smid)
{
        return cpu_to_le32(ioc->sense_dma +
                        ((smid - 1) * SCSI_SENSE_BUFFERSIZE));
}

/**
 * mpt2sas_base_get_reply_virt_addr - obtain reply frames virt address
 * @ioc: per adapter object
 * @phys_addr: lower 32 physical addr of the reply
 *
 * Converts 32bit lower physical addr into a virt address.
 */
void *
mpt2sas_base_get_reply_virt_addr(struct MPT2SAS_ADAPTER *ioc, u32 phys_addr)
{
        if (!phys_addr)
                return NULL;
        return ioc->reply + (phys_addr - (u32)ioc->reply_dma);
}

/**
 * mpt2sas_base_get_smid - obtain a free smid from internal queue
 * @ioc: per adapter object
 * @cb_idx: callback index
 *
 * Returns smid (zero is invalid)
 */
u16
mpt2sas_base_get_smid(struct MPT2SAS_ADAPTER *ioc, u8 cb_idx)
{
        unsigned long flags;
        struct request_tracker *request;
        u16 smid;

        spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
        if (list_empty(&ioc->internal_free_list)) {
                spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
                printk(MPT2SAS_ERR_FMT "%s: smid not available\n",
                    ioc->name, __func__);
                return 0;
        }

        request = list_entry(ioc->internal_free_list.next,
            struct request_tracker, tracker_list);
        request->cb_idx = cb_idx;
        smid = request->smid;
        list_del(&request->tracker_list);
        spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
        return smid;
}

/**
 * mpt2sas_base_get_smid_scsiio - obtain a free smid from scsiio queue
 * @ioc: per adapter object
 * @cb_idx: callback index
 * @scmd: pointer to scsi command object
 *
 * Returns smid (zero is invalid)
 */
u16
mpt2sas_base_get_smid_scsiio(struct MPT2SAS_ADAPTER *ioc, u8 cb_idx,
    struct scsi_cmnd *scmd)
{
        unsigned long flags;
        struct request_tracker *request;
        u16 smid;

        spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
        if (list_empty(&ioc->free_list)) {
                spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
                printk(MPT2SAS_ERR_FMT "%s: smid not available\n",
                    ioc->name, __func__);
                return 0;
        }

        request = list_entry(ioc->free_list.next,
            struct request_tracker, tracker_list);
        request->scmd = scmd;
        request->cb_idx = cb_idx;
        smid = request->smid;
        list_del(&request->tracker_list);
        spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
        return smid;
}

/**
 * mpt2sas_base_get_smid_hpr - obtain a free smid from hi-priority queue
 * @ioc: per adapter object
 * @cb_idx: callback index
 *
 * Returns smid (zero is invalid)
 */
u16
mpt2sas_base_get_smid_hpr(struct MPT2SAS_ADAPTER *ioc, u8 cb_idx)
{
        unsigned long flags;
        struct request_tracker *request;
        u16 smid;

        spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
        if (list_empty(&ioc->hpr_free_list)) {
                spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
                return 0;
        }

        request = list_entry(ioc->hpr_free_list.next,
            struct request_tracker, tracker_list);
        request->cb_idx = cb_idx;
        smid = request->smid;
        list_del(&request->tracker_list);
        spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
        return smid;
}


/**
 * mpt2sas_base_free_smid - put smid back on free_list
 * @ioc: per adapter object
 * @smid: system request message index
 *
 * Return nothing.
 */
void
mpt2sas_base_free_smid(struct MPT2SAS_ADAPTER *ioc, u16 smid)
{
        unsigned long flags;
        int i;

        spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
        if (smid >= ioc->hi_priority_smid) {
                if (smid < ioc->internal_smid) {
                        /* hi-priority */
                        i = smid - ioc->hi_priority_smid;
                        ioc->hpr_lookup[i].cb_idx = 0xFF;
                        list_add_tail(&ioc->hpr_lookup[i].tracker_list,
                            &ioc->hpr_free_list);
                } else {
                        /* internal queue */
                        i = smid - ioc->internal_smid;
                        ioc->internal_lookup[i].cb_idx = 0xFF;
                        list_add_tail(&ioc->internal_lookup[i].tracker_list,
                            &ioc->internal_free_list);
                }
                spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
                return;
        }

        /* scsiio queue */
        i = smid - 1;
        ioc->scsi_lookup[i].cb_idx = 0xFF;
        ioc->scsi_lookup[i].scmd = NULL;
        list_add_tail(&ioc->scsi_lookup[i].tracker_list,
            &ioc->free_list);
        spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);

        /*
         * See _wait_for_commands_to_complete() call with regards to this code.
         */
        if (ioc->shost_recovery && ioc->pending_io_count) {
                if (ioc->pending_io_count == 1)
                        wake_up(&ioc->reset_wq);
                ioc->pending_io_count--;
        }
}

/**
 * _base_writeq - 64 bit write to MMIO
 * @ioc: per adapter object
 * @b: data payload
 * @addr: address in MMIO space
 * @writeq_lock: spin lock
 *
 * Glue for handling an atomic 64 bit word to MMIO. This special handling takes
 * care of 32 bit environment where its not quarenteed to send the entire word
 * in one transfer.
 */
#ifndef writeq
static inline void _base_writeq(__u64 b, volatile void __iomem *addr,
    spinlock_t *writeq_lock)
{
        unsigned long flags;
        __u64 data_out = cpu_to_le64(b);

        spin_lock_irqsave(writeq_lock, flags);
        writel((u32)(data_out), addr);
        writel((u32)(data_out >> 32), (addr + 4));
        spin_unlock_irqrestore(writeq_lock, flags);
}
#else
static inline void _base_writeq(__u64 b, volatile void __iomem *addr,
    spinlock_t *writeq_lock)
{
        writeq(cpu_to_le64(b), addr);
}
#endif

/**
 * mpt2sas_base_put_smid_scsi_io - send SCSI_IO request to firmware
 * @ioc: per adapter object
 * @smid: system request message index
 * @handle: device handle
 *
 * Return nothing.
 */
void
mpt2sas_base_put_smid_scsi_io(struct MPT2SAS_ADAPTER *ioc, u16 smid, u16 handle)
{
        Mpi2RequestDescriptorUnion_t descriptor;
        u64 *request = (u64 *)&descriptor;


        descriptor.SCSIIO.RequestFlags = MPI2_REQ_DESCRIPT_FLAGS_SCSI_IO;
        descriptor.SCSIIO.MSIxIndex = 0; /* TODO */
        descriptor.SCSIIO.SMID = cpu_to_le16(smid);
        descriptor.SCSIIO.DevHandle = cpu_to_le16(handle);
        descriptor.SCSIIO.LMID = 0;
        _base_writeq(*request, &ioc->chip->RequestDescriptorPostLow,
            &ioc->scsi_lookup_lock);
}


/**
 * mpt2sas_base_put_smid_hi_priority - send Task Managment request to firmware
 * @ioc: per adapter object
 * @smid: system request message index
 *
 * Return nothing.
 */
void
mpt2sas_base_put_smid_hi_priority(struct MPT2SAS_ADAPTER *ioc, u16 smid)
{
        Mpi2RequestDescriptorUnion_t descriptor;
        u64 *request = (u64 *)&descriptor;

        descriptor.HighPriority.RequestFlags =
            MPI2_REQ_DESCRIPT_FLAGS_HIGH_PRIORITY;
        descriptor.HighPriority.MSIxIndex = 0; /* TODO */
        descriptor.HighPriority.SMID = cpu_to_le16(smid);
        descriptor.HighPriority.LMID = 0;
        descriptor.HighPriority.Reserved1 = 0;
        _base_writeq(*request, &ioc->chip->RequestDescriptorPostLow,
            &ioc->scsi_lookup_lock);
}

/**
 * mpt2sas_base_put_smid_default - Default, primarily used for config pages
 * @ioc: per adapter object
 * @smid: system request message index
 *
 * Return nothing.
 */
void
mpt2sas_base_put_smid_default(struct MPT2SAS_ADAPTER *ioc, u16 smid)
{
        Mpi2RequestDescriptorUnion_t descriptor;
        u64 *request = (u64 *)&descriptor;

        descriptor.Default.RequestFlags = MPI2_REQ_DESCRIPT_FLAGS_DEFAULT_TYPE;
        descriptor.Default.MSIxIndex = 0; /* TODO */
        descriptor.Default.SMID = cpu_to_le16(smid);
        descriptor.Default.LMID = 0;
        descriptor.Default.DescriptorTypeDependent = 0;
        _base_writeq(*request, &ioc->chip->RequestDescriptorPostLow,
            &ioc->scsi_lookup_lock);
}

/**
 * mpt2sas_base_put_smid_target_assist - send Target Assist/Status to firmware
 * @ioc: per adapter object
 * @smid: system request message index
 * @io_index: value used to track the IO
 *
 * Return nothing.
 */
void
mpt2sas_base_put_smid_target_assist(struct MPT2SAS_ADAPTER *ioc, u16 smid,
    u16 io_index)
{
        Mpi2RequestDescriptorUnion_t descriptor;
        u64 *request = (u64 *)&descriptor;

        descriptor.SCSITarget.RequestFlags =
            MPI2_REQ_DESCRIPT_FLAGS_SCSI_TARGET;
        descriptor.SCSITarget.MSIxIndex = 0; /* TODO */
        descriptor.SCSITarget.SMID = cpu_to_le16(smid);
        descriptor.SCSITarget.LMID = 0;
        descriptor.SCSITarget.IoIndex = cpu_to_le16(io_index);
        _base_writeq(*request, &ioc->chip->RequestDescriptorPostLow,
            &ioc->scsi_lookup_lock);
}

/**
 * _base_display_dell_branding - Disply branding string
 * @ioc: per adapter object
 *
 * Return nothing.
 */
static void
_base_display_dell_branding(struct MPT2SAS_ADAPTER *ioc)
{
        char dell_branding[MPT2SAS_DELL_BRANDING_SIZE];

        if (ioc->pdev->subsystem_vendor != PCI_VENDOR_ID_DELL)
                return;

        memset(dell_branding, 0, MPT2SAS_DELL_BRANDING_SIZE);
        switch (ioc->pdev->subsystem_device) {
        case MPT2SAS_DELL_6GBPS_SAS_HBA_SSDID:
                strncpy(dell_branding, MPT2SAS_DELL_6GBPS_SAS_HBA_BRANDING,
                    MPT2SAS_DELL_BRANDING_SIZE - 1);
                break;
        case MPT2SAS_DELL_PERC_H200_ADAPTER_SSDID:
                strncpy(dell_branding, MPT2SAS_DELL_PERC_H200_ADAPTER_BRANDING,
                    MPT2SAS_DELL_BRANDING_SIZE - 1);
                break;
        case MPT2SAS_DELL_PERC_H200_INTEGRATED_SSDID:
                strncpy(dell_branding,
                    MPT2SAS_DELL_PERC_H200_INTEGRATED_BRANDING,
                    MPT2SAS_DELL_BRANDING_SIZE - 1);
                break;
        case MPT2SAS_DELL_PERC_H200_MODULAR_SSDID:
                strncpy(dell_branding,
                    MPT2SAS_DELL_PERC_H200_MODULAR_BRANDING,
                    MPT2SAS_DELL_BRANDING_SIZE - 1);
                break;
        case MPT2SAS_DELL_PERC_H200_EMBEDDED_SSDID:
                strncpy(dell_branding,
                    MPT2SAS_DELL_PERC_H200_EMBEDDED_BRANDING,
                    MPT2SAS_DELL_BRANDING_SIZE - 1);
                break;
        case MPT2SAS_DELL_PERC_H200_SSDID:
                strncpy(dell_branding, MPT2SAS_DELL_PERC_H200_BRANDING,
                    MPT2SAS_DELL_BRANDING_SIZE - 1);
                break;
        case MPT2SAS_DELL_6GBPS_SAS_SSDID:
                strncpy(dell_branding, MPT2SAS_DELL_6GBPS_SAS_BRANDING,
                    MPT2SAS_DELL_BRANDING_SIZE - 1);
                break;
        default:
                sprintf(dell_branding, "0x%4X", ioc->pdev->subsystem_device);
                break;
        }

        printk(MPT2SAS_INFO_FMT "%s: Vendor(0x%04X), Device(0x%04X),"
            " SSVID(0x%04X), SSDID(0x%04X)\n", ioc->name, dell_branding,
            ioc->pdev->vendor, ioc->pdev->device, ioc->pdev->subsystem_vendor,
            ioc->pdev->subsystem_device);
}

/**
 * _base_display_ioc_capabilities - Disply IOC's capabilities.
 * @ioc: per adapter object
 *
 * Return nothing.
 */
static void
_base_display_ioc_capabilities(struct MPT2SAS_ADAPTER *ioc)
{
        int i = 0;
        char desc[16];
        u8 revision;
        u32 iounit_pg1_flags;

        pci_read_config_byte(ioc->pdev, PCI_CLASS_REVISION, &revision);
        strncpy(desc, ioc->manu_pg0.ChipName, 16);
        printk(MPT2SAS_INFO_FMT "%s: FWVersion(%02d.%02d.%02d.%02d), "
           "ChipRevision(0x%02x), BiosVersion(%02d.%02d.%02d.%02d)\n",
            ioc->name, desc,
           (ioc->facts.FWVersion.Word & 0xFF000000) >> 24,
           (ioc->facts.FWVersion.Word & 0x00FF0000) >> 16,
           (ioc->facts.FWVersion.Word & 0x0000FF00) >> 8,
           ioc->facts.FWVersion.Word & 0x000000FF,
           revision,
           (ioc->bios_pg3.BiosVersion & 0xFF000000) >> 24,
           (ioc->bios_pg3.BiosVersion & 0x00FF0000) >> 16,
           (ioc->bios_pg3.BiosVersion & 0x0000FF00) >> 8,
            ioc->bios_pg3.BiosVersion & 0x000000FF);

        _base_display_dell_branding(ioc);

        printk(MPT2SAS_INFO_FMT "Protocol=(", ioc->name);

        if (ioc->facts.ProtocolFlags & MPI2_IOCFACTS_PROTOCOL_SCSI_INITIATOR) {
                printk("Initiator");
                i++;
        }

        if (ioc->facts.ProtocolFlags & MPI2_IOCFACTS_PROTOCOL_SCSI_TARGET) {
                printk("%sTarget", i ? "," : "");
                i++;
        }

        i = 0;
        printk("), ");
        printk("Capabilities=(");

        if (ioc->facts.IOCCapabilities &
            MPI2_IOCFACTS_CAPABILITY_INTEGRATED_RAID) {
                printk("Raid");
                i++;
        }

        if (ioc->facts.IOCCapabilities & MPI2_IOCFACTS_CAPABILITY_TLR) {
                printk("%sTLR", i ? "," : "");
                i++;
        }

        if (ioc->facts.IOCCapabilities & MPI2_IOCFACTS_CAPABILITY_MULTICAST) {
                printk("%sMulticast", i ? "," : "");
                i++;
        }

        if (ioc->facts.IOCCapabilities &
            MPI2_IOCFACTS_CAPABILITY_BIDIRECTIONAL_TARGET) {
                printk("%sBIDI Target", i ? "," : "");
                i++;
        }

        if (ioc->facts.IOCCapabilities & MPI2_IOCFACTS_CAPABILITY_EEDP) {
                printk("%sEEDP", i ? "," : "");
                i++;
        }

        if (ioc->facts.IOCCapabilities &
            MPI2_IOCFACTS_CAPABILITY_SNAPSHOT_BUFFER) {
                printk("%sSnapshot Buffer", i ? "," : "");
                i++;
        }

        if (ioc->facts.IOCCapabilities &
            MPI2_IOCFACTS_CAPABILITY_DIAG_TRACE_BUFFER) {
                printk("%sDiag Trace Buffer", i ? "," : "");
                i++;
        }

        if (ioc->facts.IOCCapabilities &
            MPI2_IOCFACTS_CAPABILITY_EXTENDED_BUFFER) {
                printk(KERN_INFO "%sDiag Extended Buffer", i ? "," : "");
                i++;
        }

        if (ioc->facts.IOCCapabilities &
            MPI2_IOCFACTS_CAPABILITY_TASK_SET_FULL_HANDLING) {
                printk("%sTask Set Full", i ? "," : "");
                i++;
        }

        iounit_pg1_flags = le32_to_cpu(ioc->iounit_pg1.Flags);
        if (!(iounit_pg1_flags & MPI2_IOUNITPAGE1_NATIVE_COMMAND_Q_DISABLE)) {
                printk("%sNCQ", i ? "," : "");
                i++;
        }

        printk(")\n");
}

/**
 * _base_static_config_pages - static start of day config pages
 * @ioc: per adapter object
 *
 * Return nothing.
 */
static void
_base_static_config_pages(struct MPT2SAS_ADAPTER *ioc)
{
        Mpi2ConfigReply_t mpi_reply;
        u32 iounit_pg1_flags;

        mpt2sas_config_get_manufacturing_pg0(ioc, &mpi_reply, &ioc->manu_pg0);
        if (ioc->ir_firmware)
                mpt2sas_config_get_manufacturing_pg10(ioc, &mpi_reply,
                    &ioc->manu_pg10);
        mpt2sas_config_get_bios_pg2(ioc, &mpi_reply, &ioc->bios_pg2);
        mpt2sas_config_get_bios_pg3(ioc, &mpi_reply, &ioc->bios_pg3);
        mpt2sas_config_get_ioc_pg8(ioc, &mpi_reply, &ioc->ioc_pg8);
        mpt2sas_config_get_iounit_pg0(ioc, &mpi_reply, &ioc->iounit_pg0);
        mpt2sas_config_get_iounit_pg1(ioc, &mpi_reply, &ioc->iounit_pg1);
        _base_display_ioc_capabilities(ioc);

        /*
         * Enable task_set_full handling in iounit_pg1 when the
         * facts capabilities indicate that its supported.
         */
        iounit_pg1_flags = le32_to_cpu(ioc->iounit_pg1.Flags);
        if ((ioc->facts.IOCCapabilities &
            MPI2_IOCFACTS_CAPABILITY_TASK_SET_FULL_HANDLING))
                iounit_pg1_flags &=
                    ~MPI2_IOUNITPAGE1_DISABLE_TASK_SET_FULL_HANDLING;
        else
                iounit_pg1_flags |=
                    MPI2_IOUNITPAGE1_DISABLE_TASK_SET_FULL_HANDLING;
        ioc->iounit_pg1.Flags = cpu_to_le32(iounit_pg1_flags);
        mpt2sas_config_set_iounit_pg1(ioc, &mpi_reply, &ioc->iounit_pg1);
}

/**
 * _base_release_memory_pools - release memory
 * @ioc: per adapter object
 *
 * Free memory allocated from _base_allocate_memory_pools.
 *
 * Return nothing.
 */
static void
_base_release_memory_pools(struct MPT2SAS_ADAPTER *ioc)
{
        dexitprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s\n", ioc->name,
            __func__));

        if (ioc->request) {
                pci_free_consistent(ioc->pdev, ioc->request_dma_sz,
                    ioc->request,  ioc->request_dma);
                dexitprintk(ioc, printk(MPT2SAS_INFO_FMT "request_pool(0x%p)"
                    ": free\n", ioc->name, ioc->request));
                ioc->request = NULL;
        }

        if (ioc->sense) {
                pci_pool_free(ioc->sense_dma_pool, ioc->sense, ioc->sense_dma);
                if (ioc->sense_dma_pool)
                        pci_pool_destroy(ioc->sense_dma_pool);
                dexitprintk(ioc, printk(MPT2SAS_INFO_FMT "sense_pool(0x%p)"
                    ": free\n", ioc->name, ioc->sense));
                ioc->sense = NULL;
        }

        if (ioc->reply) {
                pci_pool_free(ioc->reply_dma_pool, ioc->reply, ioc->reply_dma);
                if (ioc->reply_dma_pool)
                        pci_pool_destroy(ioc->reply_dma_pool);
                dexitprintk(ioc, printk(MPT2SAS_INFO_FMT "reply_pool(0x%p)"
                     ": free\n", ioc->name, ioc->reply));
                ioc->reply = NULL;
        }

        if (ioc->reply_free) {
                pci_pool_free(ioc->reply_free_dma_pool, ioc->reply_free,
                    ioc->reply_free_dma);
                if (ioc->reply_free_dma_pool)
                        pci_pool_destroy(ioc->reply_free_dma_pool);
                dexitprintk(ioc, printk(MPT2SAS_INFO_FMT "reply_free_pool"
                    "(0x%p): free\n", ioc->name, ioc->reply_free));
                ioc->reply_free = NULL;
        }

        if (ioc->reply_post_free) {
                pci_pool_free(ioc->reply_post_free_dma_pool,
                    ioc->reply_post_free, ioc->reply_post_free_dma);
                if (ioc->reply_post_free_dma_pool)
                        pci_pool_destroy(ioc->reply_post_free_dma_pool);
                dexitprintk(ioc, printk(MPT2SAS_INFO_FMT
                    "reply_post_free_pool(0x%p): free\n", ioc->name,
                    ioc->reply_post_free));
                ioc->reply_post_free = NULL;
        }

        if (ioc->config_page) {
                dexitprintk(ioc, printk(MPT2SAS_INFO_FMT
                    "config_page(0x%p): free\n", ioc->name,
                    ioc->config_page));
                pci_free_consistent(ioc->pdev, ioc->config_page_sz,
                    ioc->config_page, ioc->config_page_dma);
        }

        if (ioc->scsi_lookup) {
                free_pages((ulong)ioc->scsi_lookup, ioc->scsi_lookup_pages);
                ioc->scsi_lookup = NULL;
        }
        kfree(ioc->hpr_lookup);
        kfree(ioc->internal_lookup);
}


/**
 * _base_allocate_memory_pools - allocate start of day memory pools
 * @ioc: per adapter object
 * @sleep_flag: CAN_SLEEP or NO_SLEEP
 *
 * Returns 0 success, anything else error
 */
static int
_base_allocate_memory_pools(struct MPT2SAS_ADAPTER *ioc,  int sleep_flag)
{
        Mpi2IOCFactsReply_t *facts;
        u32 queue_size, queue_diff;
        u16 max_sge_elements;
        u16 num_of_reply_frames;
        u16 chains_needed_per_io;
        u32 sz, total_sz;
        u32 retry_sz;
        u16 max_request_credit;

        dinitprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s\n", ioc->name,
            __func__));

        retry_sz = 0;
        facts = &ioc->facts;

        /* command line tunables  for max sgl entries */
        if (max_sgl_entries != -1) {
                ioc->shost->sg_tablesize = (max_sgl_entries <
                    MPT2SAS_SG_DEPTH) ? max_sgl_entries :
                    MPT2SAS_SG_DEPTH;
        } else {
                ioc->shost->sg_tablesize = MPT2SAS_SG_DEPTH;
        }

        /* command line tunables  for max controller queue depth */
        if (max_queue_depth != -1) {
                max_request_credit = (max_queue_depth < facts->RequestCredit)
                    ? max_queue_depth : facts->RequestCredit;
        } else {
                max_request_credit = (facts->RequestCredit >
                    MPT2SAS_MAX_REQUEST_QUEUE) ? MPT2SAS_MAX_REQUEST_QUEUE :
                    facts->RequestCredit;
        }

        ioc->hba_queue_depth = max_request_credit;
        ioc->hi_priority_depth = facts->HighPriorityCredit;
        ioc->internal_depth = ioc->hi_priority_depth + 5;

        /* request frame size */
        ioc->request_sz = facts->IOCRequestFrameSize * 4;

        /* reply frame size */
        ioc->reply_sz = facts->ReplyFrameSize * 4;

 retry_allocation:
        total_sz = 0;
        /* calculate number of sg elements left over in the 1st frame */
        max_sge_elements = ioc->request_sz - ((sizeof(Mpi2SCSIIORequest_t) -
            sizeof(Mpi2SGEIOUnion_t)) + ioc->sge_size);
        ioc->max_sges_in_main_message = max_sge_elements/ioc->sge_size;

        /* now do the same for a chain buffer */
        max_sge_elements = ioc->request_sz - ioc->sge_size;
        ioc->max_sges_in_chain_message = max_sge_elements/ioc->sge_size;

        ioc->chain_offset_value_for_main_message =
            ((sizeof(Mpi2SCSIIORequest_t) - sizeof(Mpi2SGEIOUnion_t)) +
             (ioc->max_sges_in_chain_message * ioc->sge_size)) / 4;

        /*

         *  MPT2SAS_SG_DEPTH = CONFIG_FUSION_MAX_SGE
         */
        chains_needed_per_io = ((ioc->shost->sg_tablesize -
           ioc->max_sges_in_main_message)/ioc->max_sges_in_chain_message)
            + 1;
        if (chains_needed_per_io > facts->MaxChainDepth) {
                chains_needed_per_io = facts->MaxChainDepth;
                ioc->shost->sg_tablesize = min_t(u16,
                ioc->max_sges_in_main_message + (ioc->max_sges_in_chain_message
                * chains_needed_per_io), ioc->shost->sg_tablesize);
        }
        ioc->chains_needed_per_io = chains_needed_per_io;

        /* reply free queue sizing - taking into account for events */
        num_of_reply_frames = ioc->hba_queue_depth + 32;

        /* number of replies frames can't be a multiple of 16 */
        /* decrease number of reply frames by 1 */
        if (!(num_of_reply_frames % 16))
                num_of_reply_frames--;

        /* calculate number of reply free queue entries
         *  (must be multiple of 16)
         */

        /* (we know reply_free_queue_depth is not a multiple of 16) */
        queue_size = num_of_reply_frames;
        queue_size += 16 - (queue_size % 16);
        ioc->reply_free_queue_depth = queue_size;

        /* reply descriptor post queue sizing */
        /* this size should be the number of request frames + number of reply
         * frames
         */

        queue_size = ioc->hba_queue_depth + num_of_reply_frames + 1;
        /* round up to 16 byte boundary */
        if (queue_size % 16)
                queue_size += 16 - (queue_size % 16);

        /* check against IOC maximum reply post queue depth */
        if (queue_size > facts->MaxReplyDescriptorPostQueueDepth) {
                queue_diff = queue_size -
                    facts->MaxReplyDescriptorPostQueueDepth;

                /* round queue_diff up to multiple of 16 */
                if (queue_diff % 16)
                        queue_diff += 16 - (queue_diff % 16);

                /* adjust hba_queue_depth, reply_free_queue_depth,
                 * and queue_size
                 */
                ioc->hba_queue_depth -= queue_diff;
                ioc->reply_free_queue_depth -= queue_diff;
                queue_size -= queue_diff;
        }
        ioc->reply_post_queue_depth = queue_size;

        dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "scatter gather: "
            "sge_in_main_msg(%d), sge_per_chain(%d), sge_per_io(%d), "
            "chains_per_io(%d)\n", ioc->name, ioc->max_sges_in_main_message,
            ioc->max_sges_in_chain_message, ioc->shost->sg_tablesize,
            ioc->chains_needed_per_io));

        ioc->scsiio_depth = ioc->hba_queue_depth -
            ioc->hi_priority_depth - ioc->internal_depth;

        /* set the scsi host can_queue depth
         * with some internal commands that could be outstanding
         */
        ioc->shost->can_queue = ioc->scsiio_depth - (2);
        dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "scsi host: "
            "can_queue depth (%d)\n", ioc->name, ioc->shost->can_queue));

        /* contiguous pool for request and chains, 16 byte align, one extra "
         * "frame for smid=0
         */
        ioc->chain_depth = ioc->chains_needed_per_io * ioc->scsiio_depth;
        sz = ((ioc->scsiio_depth + 1 + ioc->chain_depth) * ioc->request_sz);

        /* hi-priority queue */
        sz += (ioc->hi_priority_depth * ioc->request_sz);

        /* internal queue */
        sz += (ioc->internal_depth * ioc->request_sz);

        ioc->request_dma_sz = sz;
        ioc->request = pci_alloc_consistent(ioc->pdev, sz, &ioc->request_dma);
        if (!ioc->request) {
                printk(MPT2SAS_ERR_FMT "request pool: pci_alloc_consistent "
                    "failed: hba_depth(%d), chains_per_io(%d), frame_sz(%d), "
                    "total(%d kB)\n", ioc->name, ioc->hba_queue_depth,
                    ioc->chains_needed_per_io, ioc->request_sz, sz/1024);
                if (ioc->scsiio_depth < MPT2SAS_SAS_QUEUE_DEPTH)
                        goto out;
                retry_sz += 64;
                ioc->hba_queue_depth = max_request_credit - retry_sz;
                goto retry_allocation;
        }

        if (retry_sz)
                printk(MPT2SAS_ERR_FMT "request pool: pci_alloc_consistent "
                    "succeed: hba_depth(%d), chains_per_io(%d), frame_sz(%d), "
                    "total(%d kb)\n", ioc->name, ioc->hba_queue_depth,
                    ioc->chains_needed_per_io, ioc->request_sz, sz/1024);


        /* hi-priority queue */
        ioc->hi_priority = ioc->request + ((ioc->scsiio_depth + 1) *
            ioc->request_sz);
        ioc->hi_priority_dma = ioc->request_dma + ((ioc->scsiio_depth + 1) *
            ioc->request_sz);

        /* internal queue */
        ioc->internal = ioc->hi_priority + (ioc->hi_priority_depth *
            ioc->request_sz);
        ioc->internal_dma = ioc->hi_priority_dma + (ioc->hi_priority_depth *
            ioc->request_sz);

        ioc->chain = ioc->internal + (ioc->internal_depth *
            ioc->request_sz);
        ioc->chain_dma = ioc->internal_dma + (ioc->internal_depth *
            ioc->request_sz);

        dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "request pool(0x%p): "
            "depth(%d), frame_size(%d), pool_size(%d kB)\n", ioc->name,
            ioc->request, ioc->hba_queue_depth, ioc->request_sz,
            (ioc->hba_queue_depth * ioc->request_sz)/1024));
        dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "chain pool(0x%p): depth"
            "(%d), frame_size(%d), pool_size(%d kB)\n", ioc->name, ioc->chain,
            ioc->chain_depth, ioc->request_sz, ((ioc->chain_depth *
            ioc->request_sz))/1024));
        dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "request pool: dma(0x%llx)\n",
            ioc->name, (unsigned long long) ioc->request_dma));
        total_sz += sz;

        sz = ioc->scsiio_depth * sizeof(struct request_tracker);
        ioc->scsi_lookup_pages = get_order(sz);
        ioc->scsi_lookup = (struct request_tracker *)__get_free_pages(
            GFP_KERNEL, ioc->scsi_lookup_pages);
        if (!ioc->scsi_lookup) {
                printk(MPT2SAS_ERR_FMT "scsi_lookup: get_free_pages failed, "
                    "sz(%d)\n", ioc->name, (int)sz);
                goto out;
        }

        dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "scsiio(0x%p): "
            "depth(%d)\n", ioc->name, ioc->request,
            ioc->scsiio_depth));

        /* initialize hi-priority queue smid's */
        ioc->hpr_lookup = kcalloc(ioc->hi_priority_depth,
            sizeof(struct request_tracker), GFP_KERNEL);
        if (!ioc->hpr_lookup) {
                printk(MPT2SAS_ERR_FMT "hpr_lookup: kcalloc failed\n",
                    ioc->name);
                goto out;
        }
        ioc->hi_priority_smid = ioc->scsiio_depth + 1;
        dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "hi_priority(0x%p): "
            "depth(%d), start smid(%d)\n", ioc->name, ioc->hi_priority,
            ioc->hi_priority_depth, ioc->hi_priority_smid));

        /* initialize internal queue smid's */
        ioc->internal_lookup = kcalloc(ioc->internal_depth,
            sizeof(struct request_tracker), GFP_KERNEL);
        if (!ioc->internal_lookup) {
                printk(MPT2SAS_ERR_FMT "internal_lookup: kcalloc failed\n",
                    ioc->name);
                goto out;
        }
        ioc->internal_smid = ioc->hi_priority_smid + ioc->hi_priority_depth;
        dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "internal(0x%p): "
            "depth(%d), start smid(%d)\n", ioc->name, ioc->internal,
             ioc->internal_depth, ioc->internal_smid));

        /* sense buffers, 4 byte align */
        sz = ioc->scsiio_depth * SCSI_SENSE_BUFFERSIZE;
        ioc->sense_dma_pool = pci_pool_create("sense pool", ioc->pdev, sz, 4,
            0);
        if (!ioc->sense_dma_pool) {
                printk(MPT2SAS_ERR_FMT "sense pool: pci_pool_create failed\n",
                    ioc->name);
                goto out;
        }
        ioc->sense = pci_pool_alloc(ioc->sense_dma_pool , GFP_KERNEL,
            &ioc->sense_dma);
        if (!ioc->sense) {
                printk(MPT2SAS_ERR_FMT "sense pool: pci_pool_alloc failed\n",
                    ioc->name);
                goto out;
        }
        dinitprintk(ioc, printk(MPT2SAS_INFO_FMT
            "sense pool(0x%p): depth(%d), element_size(%d), pool_size"
            "(%d kB)\n", ioc->name, ioc->sense, ioc->scsiio_depth,
            SCSI_SENSE_BUFFERSIZE, sz/1024));
        dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "sense_dma(0x%llx)\n",
            ioc->name, (unsigned long long)ioc->sense_dma));
        total_sz += sz;

        /* reply pool, 4 byte align */
        sz = ioc->reply_free_queue_depth * ioc->reply_sz;
        ioc->reply_dma_pool = pci_pool_create("reply pool", ioc->pdev, sz, 4,
            0);
        if (!ioc->reply_dma_pool) {
                printk(MPT2SAS_ERR_FMT "reply pool: pci_pool_create failed\n",
                    ioc->name);
                goto out;
        }
        ioc->reply = pci_pool_alloc(ioc->reply_dma_pool , GFP_KERNEL,
            &ioc->reply_dma);
        if (!ioc->reply) {
                printk(MPT2SAS_ERR_FMT "reply pool: pci_pool_alloc failed\n",
                    ioc->name);
                goto out;
        }
        dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "reply pool(0x%p): depth"
            "(%d), frame_size(%d), pool_size(%d kB)\n", ioc->name, ioc->reply,
            ioc->reply_free_queue_depth, ioc->reply_sz, sz/1024));
        dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "reply_dma(0x%llx)\n",
            ioc->name, (unsigned long long)ioc->reply_dma));
        total_sz += sz;

        /* reply free queue, 16 byte align */
        sz = ioc->reply_free_queue_depth * 4;
        ioc->reply_free_dma_pool = pci_pool_create("reply_free pool",
            ioc->pdev, sz, 16, 0);
        if (!ioc->reply_free_dma_pool) {
                printk(MPT2SAS_ERR_FMT "reply_free pool: pci_pool_create "
                    "failed\n", ioc->name);
                goto out;
        }
        ioc->reply_free = pci_pool_alloc(ioc->reply_free_dma_pool , GFP_KERNEL,
            &ioc->reply_free_dma);
        if (!ioc->reply_free) {
                printk(MPT2SAS_ERR_FMT "reply_free pool: pci_pool_alloc "
                    "failed\n", ioc->name);
                goto out;
        }
        memset(ioc->reply_free, 0, sz);
        dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "reply_free pool(0x%p): "
            "depth(%d), element_size(%d), pool_size(%d kB)\n", ioc->name,
            ioc->reply_free, ioc->reply_free_queue_depth, 4, sz/1024));
        dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "reply_free_dma"
            "(0x%llx)\n", ioc->name, (unsigned long long)ioc->reply_free_dma));
        total_sz += sz;

        /* reply post queue, 16 byte align */
        sz = ioc->reply_post_queue_depth * sizeof(Mpi2DefaultReplyDescriptor_t);
        ioc->reply_post_free_dma_pool = pci_pool_create("reply_post_free pool",
            ioc->pdev, sz, 16, 0);
        if (!ioc->reply_post_free_dma_pool) {
                printk(MPT2SAS_ERR_FMT "reply_post_free pool: pci_pool_create "
                    "failed\n", ioc->name);
                goto out;
        }
        ioc->reply_post_free = pci_pool_alloc(ioc->reply_post_free_dma_pool ,
            GFP_KERNEL, &ioc->reply_post_free_dma);
        if (!ioc->reply_post_free) {
                printk(MPT2SAS_ERR_FMT "reply_post_free pool: pci_pool_alloc "
                    "failed\n", ioc->name);
                goto out;
        }
        memset(ioc->reply_post_free, 0, sz);
        dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "reply post free pool"
            "(0x%p): depth(%d), element_size(%d), pool_size(%d kB)\n",
            ioc->name, ioc->reply_post_free, ioc->reply_post_queue_depth, 8,
            sz/1024));
        dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "reply_post_free_dma = "
            "(0x%llx)\n", ioc->name, (unsigned long long)
            ioc->reply_post_free_dma));
        total_sz += sz;

        ioc->config_page_sz = 512;
        ioc->config_page = pci_alloc_consistent(ioc->pdev,
            ioc->config_page_sz, &ioc->config_page_dma);
        if (!ioc->config_page) {
                printk(MPT2SAS_ERR_FMT "config page: pci_pool_alloc "
                    "failed\n", ioc->name);
                goto out;
        }
        dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "config page(0x%p): size"
            "(%d)\n", ioc->name, ioc->config_page, ioc->config_page_sz));
        dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "config_page_dma"
            "(0x%llx)\n", ioc->name, (unsigned long long)ioc->config_page_dma));
        total_sz += ioc->config_page_sz;

        printk(MPT2SAS_INFO_FMT "Allocated physical memory: size(%d kB)\n",
            ioc->name, total_sz/1024);
        printk(MPT2SAS_INFO_FMT "Current Controller Queue Depth(%d), "
            "Max Controller Queue Depth(%d)\n",
            ioc->name, ioc->shost->can_queue, facts->RequestCredit);
        printk(MPT2SAS_INFO_FMT "Scatter Gather Elements per IO(%d)\n",
            ioc->name, ioc->shost->sg_tablesize);
        return 0;

 out:
        _base_release_memory_pools(ioc);
        return -ENOMEM;
}


/**
 * mpt2sas_base_get_iocstate - Get the current state of a MPT adapter.
 * @ioc: Pointer to MPT_ADAPTER structure
 * @cooked: Request raw or cooked IOC state
 *
 * Returns all IOC Doorbell register bits if cooked==0, else just the
 * Doorbell bits in MPI_IOC_STATE_MASK.
 */
u32
mpt2sas_base_get_iocstate(struct MPT2SAS_ADAPTER *ioc, int cooked)
{
        u32 s, sc;

        s = readl(&ioc->chip->Doorbell);
        sc = s & MPI2_IOC_STATE_MASK;
        return cooked ? sc : s;
}

/**
 * _base_wait_on_iocstate - waiting on a particular ioc state
 * @ioc_state: controller state { READY, OPERATIONAL, or RESET }
 * @timeout: timeout in second
 * @sleep_flag: CAN_SLEEP or NO_SLEEP
 *
 * Returns 0 for success, non-zero for failure.
 */
static int
_base_wait_on_iocstate(struct MPT2SAS_ADAPTER *ioc, u32 ioc_state, int timeout,
    int sleep_flag)
{
        u32 count, cntdn;
        u32 current_state;

        count = 0;
        cntdn = (sleep_flag == CAN_SLEEP) ? 1000*timeout : 2000*timeout;
        do {
                current_state = mpt2sas_base_get_iocstate(ioc, 1);
                if (current_state == ioc_state)
                        return 0;
                if (count && current_state == MPI2_IOC_STATE_FAULT)
                        break;
                if (sleep_flag == CAN_SLEEP)
                        msleep(1);
                else
                        udelay(500);
                count++;
        } while (--cntdn);

        return current_state;
}

/**
 * _base_wait_for_doorbell_int - waiting for controller interrupt(generated by
 * a write to the doorbell)
 * @ioc: per adapter object
 * @timeout: timeout in second
 * @sleep_flag: CAN_SLEEP or NO_SLEEP
 *
 * Returns 0 for success, non-zero for failure.
 *
 * Notes: MPI2_HIS_IOC2SYS_DB_STATUS - set to one when IOC writes to doorbell.
 */
static int
_base_wait_for_doorbell_int(struct MPT2SAS_ADAPTER *ioc, int timeout,
    int sleep_flag)
{
        u32 cntdn, count;
        u32 int_status;

        count = 0;
        cntdn = (sleep_flag == CAN_SLEEP) ? 1000*timeout : 2000*timeout;
        do {
                int_status = readl(&ioc->chip->HostInterruptStatus);
                if (int_status & MPI2_HIS_IOC2SYS_DB_STATUS) {
                        dhsprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s: "
                            "successfull count(%d), timeout(%d)\n", ioc->name,
                            __func__, count, timeout));
                        return 0;
                }
                if (sleep_flag == CAN_SLEEP)
                        msleep(1);
                else
                        udelay(500);
                count++;
        } while (--cntdn);

        printk(MPT2SAS_ERR_FMT "%s: failed due to timeout count(%d), "
            "int_status(%x)!\n", ioc->name, __func__, count, int_status);
        return -EFAULT;
}

/**
 * _base_wait_for_doorbell_ack - waiting for controller to read the doorbell.
 * @ioc: per adapter object
 * @timeout: timeout in second
 * @sleep_flag: CAN_SLEEP or NO_SLEEP
 *
 * Returns 0 for success, non-zero for failure.
 *
 * Notes: MPI2_HIS_SYS2IOC_DB_STATUS - set to one when host writes to
 * doorbell.
 */
static int
_base_wait_for_doorbell_ack(struct MPT2SAS_ADAPTER *ioc, int timeout,
    int sleep_flag)
{
        u32 cntdn, count;
        u32 int_status;
        u32 doorbell;

        count = 0;
        cntdn = (sleep_flag == CAN_SLEEP) ? 1000*timeout : 2000*timeout;
        do {
                int_status = readl(&ioc->chip->HostInterruptStatus);
                if (!(int_status & MPI2_HIS_SYS2IOC_DB_STATUS)) {
                        dhsprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s: "
                            "successfull count(%d), timeout(%d)\n", ioc->name,
                            __func__, count, timeout));
                        return 0;
                } else if (int_status & MPI2_HIS_IOC2SYS_DB_STATUS) {
                        doorbell = readl(&ioc->chip->Doorbell);
                        if ((doorbell & MPI2_IOC_STATE_MASK) ==
                            MPI2_IOC_STATE_FAULT) {
                                mpt2sas_base_fault_info(ioc , doorbell);
                                return -EFAULT;
                        }
                } else if (int_status == 0xFFFFFFFF)
                        goto out;

                if (sleep_flag == CAN_SLEEP)
                        msleep(1);
                else
                        udelay(500);
                count++;
        } while (--cntdn);

 out:
        printk(MPT2SAS_ERR_FMT "%s: failed due to timeout count(%d), "
            "int_status(%x)!\n", ioc->name, __func__, count, int_status);
        return -EFAULT;
}

/**
 * _base_wait_for_doorbell_not_used - waiting for doorbell to not be in use
 * @ioc: per adapter object
 * @timeout: timeout in second
 * @sleep_flag: CAN_SLEEP or NO_SLEEP
 *
 * Returns 0 for success, non-zero for failure.
 *
 */
static int
_base_wait_for_doorbell_not_used(struct MPT2SAS_ADAPTER *ioc, int timeout,
    int sleep_flag)
{
        u32 cntdn, count;
        u32 doorbell_reg;

        count = 0;
        cntdn = (sleep_flag == CAN_SLEEP) ? 1000*timeout : 2000*timeout;
        do {
                doorbell_reg = readl(&ioc->chip->Doorbell);
                if (!(doorbell_reg & MPI2_DOORBELL_USED)) {
                        dhsprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s: "
                            "successfull count(%d), timeout(%d)\n", ioc->name,
                            __func__, count, timeout));
                        return 0;
                }
                if (sleep_flag == CAN_SLEEP)
                        msleep(1);
                else
                        udelay(500);
                count++;
        } while (--cntdn);

        printk(MPT2SAS_ERR_FMT "%s: failed due to timeout count(%d), "
            "doorbell_reg(%x)!\n", ioc->name, __func__, count, doorbell_reg);
        return -EFAULT;
}

/**
 * _base_send_ioc_reset - send doorbell reset
 * @ioc: per adapter object
 * @reset_type: currently only supports: MPI2_FUNCTION_IOC_MESSAGE_UNIT_RESET
 * @timeout: timeout in second
 * @sleep_flag: CAN_SLEEP or NO_SLEEP
 *
 * Returns 0 for success, non-zero for failure.
 */
static int
_base_send_ioc_reset(struct MPT2SAS_ADAPTER *ioc, u8 reset_type, int timeout,
    int sleep_flag)
{
        u32 ioc_state;
        int r = 0;

        if (reset_type != MPI2_FUNCTION_IOC_MESSAGE_UNIT_RESET) {
                printk(MPT2SAS_ERR_FMT "%s: unknown reset_type\n",
                    ioc->name, __func__);
                return -EFAULT;
        }

        if (!(ioc->facts.IOCCapabilities &
           MPI2_IOCFACTS_CAPABILITY_EVENT_REPLAY))
                return -EFAULT;

        printk(MPT2SAS_INFO_FMT "sending message unit reset !!\n", ioc->name);

        writel(reset_type << MPI2_DOORBELL_FUNCTION_SHIFT,
            &ioc->chip->Doorbell);
        if ((_base_wait_for_doorbell_ack(ioc, 15, sleep_flag))) {
                r = -EFAULT;
                goto out;
        }
        ioc_state = _base_wait_on_iocstate(ioc, MPI2_IOC_STATE_READY,
            timeout, sleep_flag);
        if (ioc_state) {
                printk(MPT2SAS_ERR_FMT "%s: failed going to ready state "
                    " (ioc_state=0x%x)\n", ioc->name, __func__, ioc_state);
                r = -EFAULT;
                goto out;
        }
 out:
        printk(MPT2SAS_INFO_FMT "message unit reset: %s\n",
            ioc->name, ((r == 0) ? "SUCCESS" : "FAILED"));
        return r;
}

/**
 * _base_handshake_req_reply_wait - send request thru doorbell interface
 * @ioc: per adapter object
 * @request_bytes: request length
 * @request: pointer having request payload
 * @reply_bytes: reply length
 * @reply: pointer to reply payload
 * @timeout: timeout in second
 * @sleep_flag: CAN_SLEEP or NO_SLEEP
 *
 * Returns 0 for success, non-zero for failure.
 */
static int
_base_handshake_req_reply_wait(struct MPT2SAS_ADAPTER *ioc, int request_bytes,
    u32 *request, int reply_bytes, u16 *reply, int timeout, int sleep_flag)
{
        MPI2DefaultReply_t *default_reply = (MPI2DefaultReply_t *)reply;
        int i;
        u8 failed;
        u16 dummy;
        u32 *mfp;

        /* make sure doorbell is not in use */
        if ((readl(&ioc->chip->Doorbell) & MPI2_DOORBELL_USED)) {
                printk(MPT2SAS_ERR_FMT "doorbell is in use "
                    " (line=%d)\n", ioc->name, __LINE__);
                return -EFAULT;
        }

        /* clear pending doorbell interrupts from previous state changes */
        if (readl(&ioc->chip->HostInterruptStatus) &
            MPI2_HIS_IOC2SYS_DB_STATUS)
                writel(0, &ioc->chip->HostInterruptStatus);

        /* send message to ioc */
        writel(((MPI2_FUNCTION_HANDSHAKE<<MPI2_DOORBELL_FUNCTION_SHIFT) |
            ((request_bytes/4)<<MPI2_DOORBELL_ADD_DWORDS_SHIFT)),
            &ioc->chip->Doorbell);

        if ((_base_wait_for_doorbell_int(ioc, 5, NO_SLEEP))) {
                printk(MPT2SAS_ERR_FMT "doorbell handshake "
                   "int failed (line=%d)\n", ioc->name, __LINE__);
                return -EFAULT;
        }
        writel(0, &ioc->chip->HostInterruptStatus);

        if ((_base_wait_for_doorbell_ack(ioc, 5, sleep_flag))) {
                printk(MPT2SAS_ERR_FMT "doorbell handshake "
                    "ack failed (line=%d)\n", ioc->name, __LINE__);
                return -EFAULT;
        }

        /* send message 32-bits at a time */
        for (i = 0, failed = 0; i < request_bytes/4 && !failed; i++) {
                writel(cpu_to_le32(request[i]), &ioc->chip->Doorbell);
                if ((_base_wait_for_doorbell_ack(ioc, 5, sleep_flag)))
                        failed = 1;
        }

        if (failed) {
                printk(MPT2SAS_ERR_FMT "doorbell handshake "
                    "sending request failed (line=%d)\n", ioc->name, __LINE__);
                return -EFAULT;
        }

        /* now wait for the reply */
        if ((_base_wait_for_doorbell_int(ioc, timeout, sleep_flag))) {
                printk(MPT2SAS_ERR_FMT "doorbell handshake "
                   "int failed (line=%d)\n", ioc->name, __LINE__);
                return -EFAULT;
        }

        /* read the first two 16-bits, it gives the total length of the reply */
        reply[0] = le16_to_cpu(readl(&ioc->chip->Doorbell)
            & MPI2_DOORBELL_DATA_MASK);
        writel(0, &ioc->chip->HostInterruptStatus);
        if ((_base_wait_for_doorbell_int(ioc, 5, sleep_flag))) {
                printk(MPT2SAS_ERR_FMT "doorbell handshake "
                   "int failed (line=%d)\n", ioc->name, __LINE__);
                return -EFAULT;
        }
        reply[1] = le16_to_cpu(readl(&ioc->chip->Doorbell)
            & MPI2_DOORBELL_DATA_MASK);
        writel(0, &ioc->chip->HostInterruptStatus);

        for (i = 2; i < default_reply->MsgLength * 2; i++)  {
                if ((_base_wait_for_doorbell_int(ioc, 5, sleep_flag))) {
                        printk(MPT2SAS_ERR_FMT "doorbell "
                            "handshake int failed (line=%d)\n", ioc->name,
                            __LINE__);
                        return -EFAULT;
                }
                if (i >=  reply_bytes/2) /* overflow case */
                        dummy = readl(&ioc->chip->Doorbell);
                else
                        reply[i] = le16_to_cpu(readl(&ioc->chip->Doorbell)
                            & MPI2_DOORBELL_DATA_MASK);
                writel(0, &ioc->chip->HostInterruptStatus);
        }

        _base_wait_for_doorbell_int(ioc, 5, sleep_flag);
        if (_base_wait_for_doorbell_not_used(ioc, 5, sleep_flag) != 0) {
                dhsprintk(ioc, printk(MPT2SAS_INFO_FMT "doorbell is in use "
                    " (line=%d)\n", ioc->name, __LINE__));
        }
        writel(0, &ioc->chip->HostInterruptStatus);

        if (ioc->logging_level & MPT_DEBUG_INIT) {
                mfp = (u32 *)reply;
                printk(KERN_DEBUG "\toffset:data\n");
                for (i = 0; i < reply_bytes/4; i++)
                        printk(KERN_DEBUG "\t[0x%02x]:%08x\n", i*4,
                            le32_to_cpu(mfp[i]));
        }
        return 0;
}

/**
 * mpt2sas_base_sas_iounit_control - send sas iounit control to FW
 * @ioc: per adapter object
 * @mpi_reply: the reply payload from FW
 * @mpi_request: the request payload sent to FW
 *
 * The SAS IO Unit Control Request message allows the host to perform low-level
 * operations, such as resets on the PHYs of the IO Unit, also allows the host
 * to obtain the IOC assigned device handles for a device if it has other
 * identifying information about the device, in addition allows the host to
 * remove IOC resources associated with the device.
 *
 * Returns 0 for success, non-zero for failure.
 */
int
mpt2sas_base_sas_iounit_control(struct MPT2SAS_ADAPTER *ioc,
    Mpi2SasIoUnitControlReply_t *mpi_reply,
    Mpi2SasIoUnitControlRequest_t *mpi_request)
{
        u16 smid;
        u32 ioc_state;
        unsigned long timeleft;
        u8 issue_reset;
        int rc;
        void *request;
        u16 wait_state_count;

        dinitprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s\n", ioc->name,
            __func__));

        mutex_lock(&ioc->base_cmds.mutex);

        if (ioc->base_cmds.status != MPT2_CMD_NOT_USED) {
                printk(MPT2SAS_ERR_FMT "%s: base_cmd in use\n",
                    ioc->name, __func__);
                rc = -EAGAIN;
                goto out;
        }

        wait_state_count = 0;
        ioc_state = mpt2sas_base_get_iocstate(ioc, 1);
        while (ioc_state != MPI2_IOC_STATE_OPERATIONAL) {
                if (wait_state_count++ == 10) {
                        printk(MPT2SAS_ERR_FMT
                            "%s: failed due to ioc not operational\n",
                            ioc->name, __func__);
                        rc = -EFAULT;
                        goto out;
                }
                ssleep(1);
                ioc_state = mpt2sas_base_get_iocstate(ioc, 1);
                printk(MPT2SAS_INFO_FMT "%s: waiting for "
                    "operational state(count=%d)\n", ioc->name,
                    __func__, wait_state_count);
        }

        smid = mpt2sas_base_get_smid(ioc, ioc->base_cb_idx);
        if (!smid) {
                printk(MPT2SAS_ERR_FMT "%s: failed obtaining a smid\n",
                    ioc->name, __func__);
                rc = -EAGAIN;
                goto out;
        }

        rc = 0;
        ioc->base_cmds.status = MPT2_CMD_PENDING;
        request = mpt2sas_base_get_msg_frame(ioc, smid);
        ioc->base_cmds.smid = smid;
        memcpy(request, mpi_request, sizeof(Mpi2SasIoUnitControlRequest_t));
        if (mpi_request->Operation == MPI2_SAS_OP_PHY_HARD_RESET ||
            mpi_request->Operation == MPI2_SAS_OP_PHY_LINK_RESET)
                ioc->ioc_link_reset_in_progress = 1;
        mpt2sas_base_put_smid_default(ioc, smid);
        init_completion(&ioc->base_cmds.done);
        timeleft = wait_for_completion_timeout(&ioc->base_cmds.done,
            msecs_to_jiffies(10000));
        if ((mpi_request->Operation == MPI2_SAS_OP_PHY_HARD_RESET ||
            mpi_request->Operation == MPI2_SAS_OP_PHY_LINK_RESET) &&
            ioc->ioc_link_reset_in_progress)
                ioc->ioc_link_reset_in_progress = 0;
        if (!(ioc->base_cmds.status & MPT2_CMD_COMPLETE)) {
                printk(MPT2SAS_ERR_FMT "%s: timeout\n",
                    ioc->name, __func__);
                _debug_dump_mf(mpi_request,
                    sizeof(Mpi2SasIoUnitControlRequest_t)/4);
                if (!(ioc->base_cmds.status & MPT2_CMD_RESET))
                        issue_reset = 1;
                goto issue_host_reset;
        }
        if (ioc->base_cmds.status & MPT2_CMD_REPLY_VALID)
                memcpy(mpi_reply, ioc->base_cmds.reply,
                    sizeof(Mpi2SasIoUnitControlReply_t));
        else
                memset(mpi_reply, 0, sizeof(Mpi2SasIoUnitControlReply_t));
        ioc->base_cmds.status = MPT2_CMD_NOT_USED;
        goto out;

 issue_host_reset:
        if (issue_reset)
                mpt2sas_base_hard_reset_handler(ioc, CAN_SLEEP,
                    FORCE_BIG_HAMMER);
        ioc->base_cmds.status = MPT2_CMD_NOT_USED;
        rc = -EFAULT;
 out:
        mutex_unlock(&ioc->base_cmds.mutex);
        return rc;
}


/**
 * mpt2sas_base_scsi_enclosure_processor - sending request to sep device
 * @ioc: per adapter object
 * @mpi_reply: the reply payload from FW
 * @mpi_request: the request payload sent to FW
 *
 * The SCSI Enclosure Processor request message causes the IOC to
 * communicate with SES devices to control LED status signals.
 *
 * Returns 0 for success, non-zero for failure.
 */
int
mpt2sas_base_scsi_enclosure_processor(struct MPT2SAS_ADAPTER *ioc,
    Mpi2SepReply_t *mpi_reply, Mpi2SepRequest_t *mpi_request)
{
        u16 smid;
        u32 ioc_state;
        unsigned long timeleft;
        u8 issue_reset;
        int rc;
        void *request;
        u16 wait_state_count;

        dinitprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s\n", ioc->name,
            __func__));

        mutex_lock(&ioc->base_cmds.mutex);

        if (ioc->base_cmds.status != MPT2_CMD_NOT_USED) {
                printk(MPT2SAS_ERR_FMT "%s: base_cmd in use\n",
                    ioc->name, __func__);
                rc = -EAGAIN;
                goto out;
        }

        wait_state_count = 0;
        ioc_state = mpt2sas_base_get_iocstate(ioc, 1);
        while (ioc_state != MPI2_IOC_STATE_OPERATIONAL) {
                if (wait_state_count++ == 10) {
                        printk(MPT2SAS_ERR_FMT
                            "%s: failed due to ioc not operational\n",
                            ioc->name, __func__);
                        rc = -EFAULT;
                        goto out;
                }
                ssleep(1);
                ioc_state = mpt2sas_base_get_iocstate(ioc, 1);
                printk(MPT2SAS_INFO_FMT "%s: waiting for "
                    "operational state(count=%d)\n", ioc->name,
                    __func__, wait_state_count);
        }

        smid = mpt2sas_base_get_smid(ioc, ioc->base_cb_idx);
        if (!smid) {
                printk(MPT2SAS_ERR_FMT "%s: failed obtaining a smid\n",
                    ioc->name, __func__);
                rc = -EAGAIN;
                goto out;
        }

        rc = 0;
        ioc->base_cmds.status = MPT2_CMD_PENDING;
        request = mpt2sas_base_get_msg_frame(ioc, smid);
        ioc->base_cmds.smid = smid;
        memcpy(request, mpi_request, sizeof(Mpi2SepReply_t));
        mpt2sas_base_put_smid_default(ioc, smid);
        init_completion(&ioc->base_cmds.done);
        timeleft = wait_for_completion_timeout(&ioc->base_cmds.done,
            msecs_to_jiffies(10000));
        if (!(ioc->base_cmds.status & MPT2_CMD_COMPLETE)) {
                printk(MPT2SAS_ERR_FMT "%s: timeout\n",
                    ioc->name, __func__);
                _debug_dump_mf(mpi_request,
                    sizeof(Mpi2SepRequest_t)/4);
                if (!(ioc->base_cmds.status & MPT2_CMD_RESET))
                        issue_reset = 1;
                goto issue_host_reset;
        }
        if (ioc->base_cmds.status & MPT2_CMD_REPLY_VALID)
                memcpy(mpi_reply, ioc->base_cmds.reply,
                    sizeof(Mpi2SepReply_t));
        else
                memset(mpi_reply, 0, sizeof(Mpi2SepReply_t));
        ioc->base_cmds.status = MPT2_CMD_NOT_USED;
        goto out;

 issue_host_reset:
        if (issue_reset)
                mpt2sas_base_hard_reset_handler(ioc, CAN_SLEEP,
                    FORCE_BIG_HAMMER);
        ioc->base_cmds.status = MPT2_CMD_NOT_USED;
        rc = -EFAULT;
 out:
        mutex_unlock(&ioc->base_cmds.mutex);
        return rc;
}

/**
 * _base_get_port_facts - obtain port facts reply and save in ioc
 * @ioc: per adapter object
 * @sleep_flag: CAN_SLEEP or NO_SLEEP
 *
 * Returns 0 for success, non-zero for failure.
 */
static int
_base_get_port_facts(struct MPT2SAS_ADAPTER *ioc, int port, int sleep_flag)
{
        Mpi2PortFactsRequest_t mpi_request;
        Mpi2PortFactsReply_t mpi_reply, *pfacts;
        int mpi_reply_sz, mpi_request_sz, r;

        dinitprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s\n", ioc->name,
            __func__));

        mpi_reply_sz = sizeof(Mpi2PortFactsReply_t);
        mpi_request_sz = sizeof(Mpi2PortFactsRequest_t);
        memset(&mpi_request, 0, mpi_request_sz);
        mpi_request.Function = MPI2_FUNCTION_PORT_FACTS;
        mpi_request.PortNumber = port;
        r = _base_handshake_req_reply_wait(ioc, mpi_request_sz,
            (u32 *)&mpi_request, mpi_reply_sz, (u16 *)&mpi_reply, 5, CAN_SLEEP);

        if (r != 0) {
                printk(MPT2SAS_ERR_FMT "%s: handshake failed (r=%d)\n",
                    ioc->name, __func__, r);
                return r;
        }

        pfacts = &ioc->pfacts[port];
        memset(pfacts, 0, sizeof(Mpi2PortFactsReply_t));
        pfacts->PortNumber = mpi_reply.PortNumber;
        pfacts->VP_ID = mpi_reply.VP_ID;
        pfacts->VF_ID = mpi_reply.VF_ID;
        pfacts->MaxPostedCmdBuffers =
            le16_to_cpu(mpi_reply.MaxPostedCmdBuffers);

        return 0;
}

/**
 * _base_get_ioc_facts - obtain ioc facts reply and save in ioc
 * @ioc: per adapter object
 * @sleep_flag: CAN_SLEEP or NO_SLEEP
 *
 * Returns 0 for success, non-zero for failure.
 */
static int
_base_get_ioc_facts(struct MPT2SAS_ADAPTER *ioc, int sleep_flag)
{
        Mpi2IOCFactsRequest_t mpi_request;
        Mpi2IOCFactsReply_t mpi_reply, *facts;
        int mpi_reply_sz, mpi_request_sz, r;

        dinitprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s\n", ioc->name,
            __func__));

        mpi_reply_sz = sizeof(Mpi2IOCFactsReply_t);
        mpi_request_sz = sizeof(Mpi2IOCFactsRequest_t);
        memset(&mpi_request, 0, mpi_request_sz);
        mpi_request.Function = MPI2_FUNCTION_IOC_FACTS;
        r = _base_handshake_req_reply_wait(ioc, mpi_request_sz,
            (u32 *)&mpi_request, mpi_reply_sz, (u16 *)&mpi_reply, 5, CAN_SLEEP);

        if (r != 0) {
                printk(MPT2SAS_ERR_FMT "%s: handshake failed (r=%d)\n",
                    ioc->name, __func__, r);
                return r;
        }

        facts = &ioc->facts;
        memset(facts, 0, sizeof(Mpi2IOCFactsReply_t));
        facts->MsgVersion = le16_to_cpu(mpi_reply.MsgVersion);
        facts->HeaderVersion = le16_to_cpu(mpi_reply.HeaderVersion);
        facts->VP_ID = mpi_reply.VP_ID;
        facts->VF_ID = mpi_reply.VF_ID;
        facts->IOCExceptions = le16_to_cpu(mpi_reply.IOCExceptions);
        facts->MaxChainDepth = mpi_reply.MaxChainDepth;
        facts->WhoInit = mpi_reply.WhoInit;
        facts->NumberOfPorts = mpi_reply.NumberOfPorts;
        facts->RequestCredit = le16_to_cpu(mpi_reply.RequestCredit);
        facts->MaxReplyDescriptorPostQueueDepth =
            le16_to_cpu(mpi_reply.MaxReplyDescriptorPostQueueDepth);
        facts->ProductID = le16_to_cpu(mpi_reply.ProductID);
        facts->IOCCapabilities = le32_to_cpu(mpi_reply.IOCCapabilities);
        if ((facts->IOCCapabilities & MPI2_IOCFACTS_CAPABILITY_INTEGRATED_RAID))
                ioc->ir_firmware = 1;
        facts->FWVersion.Word = le32_to_cpu(mpi_reply.FWVersion.Word);
        facts->IOCRequestFrameSize =
            le16_to_cpu(mpi_reply.IOCRequestFrameSize);
        facts->MaxInitiators = le16_to_cpu(mpi_reply.MaxInitiators);
        facts->MaxTargets = le16_to_cpu(mpi_reply.MaxTargets);
        ioc->shost->max_id = -1;
        facts->MaxSasExpanders = le16_to_cpu(mpi_reply.MaxSasExpanders);
        facts->MaxEnclosures = le16_to_cpu(mpi_reply.MaxEnclosures);
        facts->ProtocolFlags = le16_to_cpu(mpi_reply.ProtocolFlags);
        facts->HighPriorityCredit =
            le16_to_cpu(mpi_reply.HighPriorityCredit);
        facts->ReplyFrameSize = mpi_reply.ReplyFrameSize;
        facts->MaxDevHandle = le16_to_cpu(mpi_reply.MaxDevHandle);

        dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "hba queue depth(%d), "
            "max chains per io(%d)\n", ioc->name, facts->RequestCredit,
            facts->MaxChainDepth));
        dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "request frame size(%d), "
            "reply frame size(%d)\n", ioc->name,
            facts->IOCRequestFrameSize * 4, facts->ReplyFrameSize * 4));
        return 0;
}

/**
 * _base_send_ioc_init - send ioc_init to firmware
 * @ioc: per adapter object
 * @sleep_flag: CAN_SLEEP or NO_SLEEP
 *
 * Returns 0 for success, non-zero for failure.
 */
static int
_base_send_ioc_init(struct MPT2SAS_ADAPTER *ioc, int sleep_flag)
{
        Mpi2IOCInitRequest_t mpi_request;
        Mpi2IOCInitReply_t mpi_reply;
        int r;
        struct timeval current_time;
        u16 ioc_status;

        dinitprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s\n", ioc->name,
            __func__));

        memset(&mpi_request, 0, sizeof(Mpi2IOCInitRequest_t));
        mpi_request.Function = MPI2_FUNCTION_IOC_INIT;
        mpi_request.WhoInit = MPI2_WHOINIT_HOST_DRIVER;
        mpi_request.VF_ID = 0; /* TODO */
        mpi_request.VP_ID = 0;
        mpi_request.MsgVersion = cpu_to_le16(MPI2_VERSION);
        mpi_request.HeaderVersion = cpu_to_le16(MPI2_HEADER_VERSION);

        /* In MPI Revision I (0xA), the SystemReplyFrameSize(offset 0x18) was
         * removed and made reserved.  For those with older firmware will need
         * this fix. It was decided that the Reply and Request frame sizes are
         * the same.
         */
        if ((ioc->facts.HeaderVersion >> 8) < 0xA) {
                mpi_request.Reserved7 = cpu_to_le16(ioc->reply_sz);
/*              mpi_request.SystemReplyFrameSize =