/*
 * Management Module Support for MPT (Message Passing Technology) based
 * controllers
 *
 * This code is based on drivers/scsi/mpt2sas/mpt2_ctl.c
 * Copyright (C) 2007-2009  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/delay.h>
#include <linux/smp_lock.h>
#include <linux/compat.h>
#include <linux/poll.h>

#include <linux/io.h>
#include <linux/uaccess.h>

#include "mpt2sas_base.h"
#include "mpt2sas_ctl.h"

static struct fasync_struct *async_queue;
static DECLARE_WAIT_QUEUE_HEAD(ctl_poll_wait);

static int _ctl_send_release(struct MPT2SAS_ADAPTER *ioc, u8 buffer_type,
    u8 *issue_reset);

/**
 * enum block_state - blocking state
 * @NON_BLOCKING: non blocking
 * @BLOCKING: blocking
 *
 * These states are for ioctls that need to wait for a response
 * from firmware, so they probably require sleep.
 */
enum block_state {
        NON_BLOCKING,
        BLOCKING,
};

#ifdef CONFIG_SCSI_MPT2SAS_LOGGING
/**
 * _ctl_display_some_debug - debug routine
 * @ioc: per adapter object
 * @smid: system request message index
 * @calling_function_name: string pass from calling function
 * @mpi_reply: reply message frame
 * Context: none.
 *
 * Function for displaying debug info helpfull when debugging issues
 * in this module.
 */
static void
_ctl_display_some_debug(struct MPT2SAS_ADAPTER *ioc, u16 smid,
    char *calling_function_name, MPI2DefaultReply_t *mpi_reply)
{
        Mpi2ConfigRequest_t *mpi_request;
        char *desc = NULL;

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

        mpi_request = mpt2sas_base_get_msg_frame(ioc, smid);
        switch (mpi_request->Function) {
        case MPI2_FUNCTION_SCSI_IO_REQUEST:
        {
                Mpi2SCSIIORequest_t *scsi_request =
                    (Mpi2SCSIIORequest_t *)mpi_request;

                snprintf(ioc->tmp_string, MPT_STRING_LENGTH,
                    "scsi_io, cmd(0x%02x), cdb_len(%d)",
                    scsi_request->CDB.CDB32[0],
                    le16_to_cpu(scsi_request->IoFlags) & 0xF);
                desc = ioc->tmp_string;
                break;
        }
        case MPI2_FUNCTION_SCSI_TASK_MGMT:
                desc = "task_mgmt";
                break;
        case MPI2_FUNCTION_IOC_INIT:
                desc = "ioc_init";
                break;
        case MPI2_FUNCTION_IOC_FACTS:
                desc = "ioc_facts";
                break;
        case MPI2_FUNCTION_CONFIG:
        {
                Mpi2ConfigRequest_t *config_request =
                    (Mpi2ConfigRequest_t *)mpi_request;

                snprintf(ioc->tmp_string, MPT_STRING_LENGTH,
                    "config, type(0x%02x), ext_type(0x%02x), number(%d)",
                    (config_request->Header.PageType &
                     MPI2_CONFIG_PAGETYPE_MASK), config_request->ExtPageType,
                    config_request->Header.PageNumber);
                desc = ioc->tmp_string;
                break;
        }
        case MPI2_FUNCTION_PORT_FACTS:
                desc = "port_facts";
                break;
        case MPI2_FUNCTION_PORT_ENABLE:
                desc = "port_enable";
                break;
        case MPI2_FUNCTION_EVENT_NOTIFICATION:
                desc = "event_notification";
                break;
        case MPI2_FUNCTION_FW_DOWNLOAD:
                desc = "fw_download";
                break;
        case MPI2_FUNCTION_FW_UPLOAD:
                desc = "fw_upload";
                break;
        case MPI2_FUNCTION_RAID_ACTION:
                desc = "raid_action";
                break;
        case MPI2_FUNCTION_RAID_SCSI_IO_PASSTHROUGH:
        {
                Mpi2SCSIIORequest_t *scsi_request =
                    (Mpi2SCSIIORequest_t *)mpi_request;

                snprintf(ioc->tmp_string, MPT_STRING_LENGTH,
                    "raid_pass, cmd(0x%02x), cdb_len(%d)",
                    scsi_request->CDB.CDB32[0],
                    le16_to_cpu(scsi_request->IoFlags) & 0xF);
                desc = ioc->tmp_string;
                break;
        }
        case MPI2_FUNCTION_SAS_IO_UNIT_CONTROL:
                desc = "sas_iounit_cntl";
                break;
        case MPI2_FUNCTION_SATA_PASSTHROUGH:
                desc = "sata_pass";
                break;
        case MPI2_FUNCTION_DIAG_BUFFER_POST:
                desc = "diag_buffer_post";
                break;
        case MPI2_FUNCTION_DIAG_RELEASE:
                desc = "diag_release";
                break;
        case MPI2_FUNCTION_SMP_PASSTHROUGH:
                desc = "smp_passthrough";
                break;
        }

        if (!desc)
                return;

        printk(MPT2SAS_DEBUG_FMT "%s: %s, smid(%d)\n",
            ioc->name, calling_function_name, desc, smid);

        if (!mpi_reply)
                return;

        if (mpi_reply->IOCStatus || mpi_reply->IOCLogInfo)
                printk(MPT2SAS_DEBUG_FMT
                    "\tiocstatus(0x%04x), loginfo(0x%08x)\n",
                    ioc->name, le16_to_cpu(mpi_reply->IOCStatus),
                    le32_to_cpu(mpi_reply->IOCLogInfo));

        if (mpi_request->Function == MPI2_FUNCTION_SCSI_IO_REQUEST ||
            mpi_request->Function ==
            MPI2_FUNCTION_RAID_SCSI_IO_PASSTHROUGH) {
                Mpi2SCSIIOReply_t *scsi_reply =
                    (Mpi2SCSIIOReply_t *)mpi_reply;
                if (scsi_reply->SCSIState || scsi_reply->SCSIStatus)
                        printk(MPT2SAS_DEBUG_FMT
                            "\tscsi_state(0x%02x), scsi_status"
                            "(0x%02x)\n", ioc->name,
                            scsi_reply->SCSIState,
                            scsi_reply->SCSIStatus);
        }
}
#endif

/**
 * mpt2sas_ctl_done - ctl module 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)
 * Context: none.
 *
 * The callback handler when using ioc->ctl_cb_idx.
 *
 * Return 1 meaning mf should be freed from _base_interrupt
 *        0 means the mf is freed from this function.
 */
u8
mpt2sas_ctl_done(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index,
        u32 reply)
{
        MPI2DefaultReply_t *mpi_reply;

        if (ioc->ctl_cmds.status == MPT2_CMD_NOT_USED)
                return 1;
        if (ioc->ctl_cmds.smid != smid)
                return 1;
        ioc->ctl_cmds.status |= MPT2_CMD_COMPLETE;
        mpi_reply = mpt2sas_base_get_reply_virt_addr(ioc, reply);
        if (mpi_reply) {
                memcpy(ioc->ctl_cmds.reply, mpi_reply, mpi_reply->MsgLength*4);
                ioc->ctl_cmds.status |= MPT2_CMD_REPLY_VALID;
        }
#ifdef CONFIG_SCSI_MPT2SAS_LOGGING
        _ctl_display_some_debug(ioc, smid, "ctl_done", mpi_reply);
#endif
        ioc->ctl_cmds.status &= ~MPT2_CMD_PENDING;
        complete(&ioc->ctl_cmds.done);
        return 1;
}

/**
 * _ctl_check_event_type - determines when an event needs logging
 * @ioc: per adapter object
 * @event: firmware event
 *
 * The bitmask in ioc->event_type[] indicates which events should be
 * be saved in the driver event_log.  This bitmask is set by application.
 *
 * Returns 1 when event should be captured, or zero means no match.
 */
static int
_ctl_check_event_type(struct MPT2SAS_ADAPTER *ioc, u16 event)
{
        u16 i;
        u32 desired_event;

        if (event >= 128 || !event || !ioc->event_log)
                return 0;

        desired_event = (1 << (event % 32));
        if (!desired_event)
                desired_event = 1;
        i = event / 32;
        return desired_event & ioc->event_type[i];
}

/**
 * mpt2sas_ctl_add_to_event_log - add event
 * @ioc: per adapter object
 * @mpi_reply: reply message frame
 *
 * Return nothing.
 */
void
mpt2sas_ctl_add_to_event_log(struct MPT2SAS_ADAPTER *ioc,
    Mpi2EventNotificationReply_t *mpi_reply)
{
        struct MPT2_IOCTL_EVENTS *event_log;
        u16 event;
        int i;
        u32 sz, event_data_sz;
        u8 send_aen = 0;

        if (!ioc->event_log)
                return;

        event = le16_to_cpu(mpi_reply->Event);

        if (_ctl_check_event_type(ioc, event)) {

                /* insert entry into circular event_log */
                i = ioc->event_context % MPT2SAS_CTL_EVENT_LOG_SIZE;
                event_log = ioc->event_log;
                event_log[i].event = event;
                event_log[i].context = ioc->event_context++;

                event_data_sz = le16_to_cpu(mpi_reply->EventDataLength)*4;
                sz = min_t(u32, event_data_sz, MPT2_EVENT_DATA_SIZE);
                memset(event_log[i].data, 0, MPT2_EVENT_DATA_SIZE);
                memcpy(event_log[i].data, mpi_reply->EventData, sz);
                send_aen = 1;
        }

        /* This aen_event_read_flag flag is set until the
         * application has read the event log.
         * For MPI2_EVENT_LOG_ENTRY_ADDED, we always notify.
         */
        if (event == MPI2_EVENT_LOG_ENTRY_ADDED ||
            (send_aen && !ioc->aen_event_read_flag)) {
                ioc->aen_event_read_flag = 1;
                wake_up_interruptible(&ctl_poll_wait);
                if (async_queue)
                        kill_fasync(&async_queue, SIGIO, POLL_IN);
        }
}

/**
 * mpt2sas_ctl_event_callback - firmware event handler (called at ISR time)
 * @ioc: per adapter object
 * @msix_index: MSIX table index supplied by the OS
 * @reply: reply message frame(lower 32bit addr)
 * Context: interrupt.
 *
 * This function merely adds a new work task into ioc->firmware_event_thread.
 * The tasks are worked from _firmware_event_work in user context.
 *
 * Return 1 meaning mf should be freed from _base_interrupt
 *        0 means the mf is freed from this function.
 */
u8
mpt2sas_ctl_event_callback(struct MPT2SAS_ADAPTER *ioc, u8 msix_index,
        u32 reply)
{
        Mpi2EventNotificationReply_t *mpi_reply;

        mpi_reply = mpt2sas_base_get_reply_virt_addr(ioc, reply);
        mpt2sas_ctl_add_to_event_log(ioc, mpi_reply);
        return 1;
}

/**
 * _ctl_verify_adapter - validates ioc_number passed from application
 * @ioc: per adapter object
 * @iocpp: The ioc pointer is returned in this.
 *
 * Return (-1) means error, else ioc_number.
 */
static int
_ctl_verify_adapter(int ioc_number, struct MPT2SAS_ADAPTER **iocpp)
{
        struct MPT2SAS_ADAPTER *ioc;

        list_for_each_entry(ioc, &mpt2sas_ioc_list, list) {
                if (ioc->id != ioc_number)
                        continue;
                *iocpp = ioc;
                return ioc_number;
        }
        *iocpp = NULL;
        return -1;
}

/**
 * mpt2sas_ctl_reset_handler - reset callback handler (for ctl)
 * @ioc: per adapter object
 * @reset_phase: phase
 *
 * The handler for doing any required cleanup or initialization.
 *
 * The reset phase can be MPT2_IOC_PRE_RESET, MPT2_IOC_AFTER_RESET,
 * MPT2_IOC_DONE_RESET
 */
void
mpt2sas_ctl_reset_handler(struct MPT2SAS_ADAPTER *ioc, int reset_phase)
{
        int i;
        u8 issue_reset;

        switch (reset_phase) {
        case MPT2_IOC_PRE_RESET:
                dtmprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s: "
                    "MPT2_IOC_PRE_RESET\n", ioc->name, __func__));
                for (i = 0; i < MPI2_DIAG_BUF_TYPE_COUNT; i++) {
                        if (!(ioc->diag_buffer_status[i] &
                            MPT2_DIAG_BUFFER_IS_REGISTERED))
                                continue;
                        if ((ioc->diag_buffer_status[i] &
                            MPT2_DIAG_BUFFER_IS_RELEASED))
                                continue;
                        _ctl_send_release(ioc, i, &issue_reset);
                }
                break;
        case MPT2_IOC_AFTER_RESET:
                dtmprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s: "
                    "MPT2_IOC_AFTER_RESET\n", ioc->name, __func__));
                if (ioc->ctl_cmds.status & MPT2_CMD_PENDING) {
                        ioc->ctl_cmds.status |= MPT2_CMD_RESET;
                        mpt2sas_base_free_smid(ioc, ioc->ctl_cmds.smid);
                        complete(&ioc->ctl_cmds.done);
                }
                break;
        case MPT2_IOC_DONE_RESET:
                dtmprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s: "
                    "MPT2_IOC_DONE_RESET\n", ioc->name, __func__));

                for (i = 0; i < MPI2_DIAG_BUF_TYPE_COUNT; i++) {
                        if (!(ioc->diag_buffer_status[i] &
                            MPT2_DIAG_BUFFER_IS_REGISTERED))
                                continue;
                        if ((ioc->diag_buffer_status[i] &
                            MPT2_DIAG_BUFFER_IS_RELEASED))
                                continue;
                        ioc->diag_buffer_status[i] |=
                            MPT2_DIAG_BUFFER_IS_DIAG_RESET;
                }
                break;
        }
}

/**
 * _ctl_fasync -
 * @fd -
 * @filep -
 * @mode -
 *
 * Called when application request fasyn callback handler.
 */
static int
_ctl_fasync(int fd, struct file *filep, int mode)
{
        return fasync_helper(fd, filep, mode, &async_queue);
}

/**
 * _ctl_release -
 * @inode -
 * @filep -
 *
 * Called when application releases the fasyn callback handler.
 */
static int
_ctl_release(struct inode *inode, struct file *filep)
{
        return fasync_helper(-1, filep, 0, &async_queue);
}

/**
 * _ctl_poll -
 * @file -
 * @wait -
 *
 */
static unsigned int
_ctl_poll(struct file *filep, poll_table *wait)
{
        struct MPT2SAS_ADAPTER *ioc;

        poll_wait(filep, &ctl_poll_wait, wait);

        list_for_each_entry(ioc, &mpt2sas_ioc_list, list) {
                if (ioc->aen_event_read_flag)
                        return POLLIN | POLLRDNORM;
        }
        return 0;
}

/**
 * _ctl_set_task_mid - assign an active smid to tm request
 * @ioc: per adapter object
 * @karg - (struct mpt2_ioctl_command)
 * @tm_request - pointer to mf from user space
 *
 * Returns 0 when an smid if found, else fail.
 * during failure, the reply frame is filled.
 */
static int
_ctl_set_task_mid(struct MPT2SAS_ADAPTER *ioc, struct mpt2_ioctl_command *karg,
    Mpi2SCSITaskManagementRequest_t *tm_request)
{
        u8 found = 0;
        u16 i;
        u16 handle;
        struct scsi_cmnd *scmd;
        struct MPT2SAS_DEVICE *priv_data;
        unsigned long flags;
        Mpi2SCSITaskManagementReply_t *tm_reply;
        u32 sz;
        u32 lun;
        char *desc = NULL;

        if (tm_request->TaskType == MPI2_SCSITASKMGMT_TASKTYPE_ABORT_TASK)
                desc = "abort_task";
        else if (tm_request->TaskType == MPI2_SCSITASKMGMT_TASKTYPE_QUERY_TASK)
                desc = "query_task";
        else
                return 0;

        lun = scsilun_to_int((struct scsi_lun *)tm_request->LUN);

        handle = le16_to_cpu(tm_request->DevHandle);
        spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
        for (i = ioc->scsiio_depth; i && !found; i--) {
                scmd = ioc->scsi_lookup[i - 1].scmd;
                if (scmd == NULL || scmd->device == NULL ||
                    scmd->device->hostdata == NULL)
                        continue;
                if (lun != scmd->device->lun)
                        continue;
                priv_data = scmd->device->hostdata;
                if (priv_data->sas_target == NULL)
                        continue;
                if (priv_data->sas_target->handle != handle)
                        continue;
                tm_request->TaskMID = cpu_to_le16(ioc->scsi_lookup[i - 1].smid);
                found = 1;
        }
        spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);

        if (!found) {
                dctlprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s: "
                    "handle(0x%04x), lun(%d), no active mid!!\n", ioc->name,
                    desc, tm_request->DevHandle, lun));
                tm_reply = ioc->ctl_cmds.reply;
                tm_reply->DevHandle = tm_request->DevHandle;
                tm_reply->Function = MPI2_FUNCTION_SCSI_TASK_MGMT;
                tm_reply->TaskType = tm_request->TaskType;
                tm_reply->MsgLength = sizeof(Mpi2SCSITaskManagementReply_t)/4;
                tm_reply->VP_ID = tm_request->VP_ID;
                tm_reply->VF_ID = tm_request->VF_ID;
                sz = min_t(u32, karg->max_reply_bytes, ioc->reply_sz);
                if (copy_to_user(karg->reply_frame_buf_ptr, ioc->ctl_cmds.reply,
                    sz))
                        printk(KERN_ERR "failure at %s:%d/%s()!\n", __FILE__,
                            __LINE__, __func__);
                return 1;
        }

        dctlprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s: "
            "handle(0x%04x), lun(%d), task_mid(%d)\n", ioc->name,
            desc, tm_request->DevHandle, lun, tm_request->TaskMID));
        return 0;
}

/**
 * _ctl_do_mpt_command - main handler for MPT2COMMAND opcode
 * @ioc: per adapter object
 * @karg - (struct mpt2_ioctl_command)
 * @mf - pointer to mf in user space
 * @state - NON_BLOCKING or BLOCKING
 */
static long
_ctl_do_mpt_command(struct MPT2SAS_ADAPTER *ioc,
    struct mpt2_ioctl_command karg, void __user *mf, enum block_state state)
{
        MPI2RequestHeader_t *mpi_request;
        MPI2DefaultReply_t *mpi_reply;
        u32 ioc_state;
        u16 ioc_status;
        u16 smid;
        unsigned long timeout, timeleft;
        u8 issue_reset;
        u32 sz;
        void *psge;
        void *priv_sense = NULL;
        void *data_out = NULL;
        dma_addr_t data_out_dma;
        size_t data_out_sz = 0;
        void *data_in = NULL;
        dma_addr_t data_in_dma;
        size_t data_in_sz = 0;
        u32 sgl_flags;
        long ret;
        u16 wait_state_count;

        issue_reset = 0;

        if (state == NON_BLOCKING && !mutex_trylock(&ioc->ctl_cmds.mutex))
                return -EAGAIN;
        else if (mutex_lock_interruptible(&ioc->ctl_cmds.mutex))
                return -ERESTARTSYS;

        if (ioc->ctl_cmds.status != MPT2_CMD_NOT_USED) {
                printk(MPT2SAS_ERR_FMT "%s: ctl_cmd in use\n",
                    ioc->name, __func__);
                ret = -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__);
                        ret = -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);
        }
        if (wait_state_count)
                printk(MPT2SAS_INFO_FMT "%s: ioc is operational\n",
                    ioc->name, __func__);

        smid = mpt2sas_base_get_smid_scsiio(ioc, ioc->ctl_cb_idx, NULL);
        if (!smid) {
                printk(MPT2SAS_ERR_FMT "%s: failed obtaining a smid\n",
                    ioc->name, __func__);
                ret = -EAGAIN;
                goto out;
        }

        ret = 0;
        ioc->ctl_cmds.status = MPT2_CMD_PENDING;
        memset(ioc->ctl_cmds.reply, 0, ioc->reply_sz);
        mpi_request = mpt2sas_base_get_msg_frame(ioc, smid);
        ioc->ctl_cmds.smid = smid;
        data_out_sz = karg.data_out_size;
        data_in_sz = karg.data_in_size;

        /* copy in request message frame from user */
        if (copy_from_user(mpi_request, mf, karg.data_sge_offset*4)) {
                printk(KERN_ERR "failure at %s:%d/%s()!\n", __FILE__, __LINE__,
                    __func__);
                ret = -EFAULT;
                mpt2sas_base_free_smid(ioc, smid);
                goto out;
        }

        if (mpi_request->Function == MPI2_FUNCTION_SCSI_IO_REQUEST ||
            mpi_request->Function == MPI2_FUNCTION_RAID_SCSI_IO_PASSTHROUGH) {
                if (!mpi_request->FunctionDependent1 ||
                    mpi_request->FunctionDependent1 >
                    cpu_to_le16(ioc->facts.MaxDevHandle)) {
                        ret = -EINVAL;
                        mpt2sas_base_free_smid(ioc, smid);
                        goto out;
                }
        }

        /* obtain dma-able memory for data transfer */
        if (data_out_sz) /* WRITE */ {
                data_out = pci_alloc_consistent(ioc->pdev, data_out_sz,
                    &data_out_dma);
                if (!data_out) {
                        printk(KERN_ERR "failure at %s:%d/%s()!\n", __FILE__,
                            __LINE__, __func__);
                        ret = -ENOMEM;
                        mpt2sas_base_free_smid(ioc, smid);
                        goto out;
                }
                if (copy_from_user(data_out, karg.data_out_buf_ptr,
                        data_out_sz)) {
                        printk(KERN_ERR "failure at %s:%d/%s()!\n", __FILE__,
                            __LINE__, __func__);
                        ret =  -EFAULT;
                        mpt2sas_base_free_smid(ioc, smid);
                        goto out;
                }
        }

        if (data_in_sz) /* READ */ {
                data_in = pci_alloc_consistent(ioc->pdev, data_in_sz,
                    &data_in_dma);
                if (!data_in) {
                        printk(KERN_ERR "failure at %s:%d/%s()!\n", __FILE__,
                            __LINE__, __func__);
                        ret = -ENOMEM;
                        mpt2sas_base_free_smid(ioc, smid);
                        goto out;
                }
        }

        /* add scatter gather elements */
        psge = (void *)mpi_request + (karg.data_sge_offset*4);

        if (!data_out_sz && !data_in_sz) {
                mpt2sas_base_build_zero_len_sge(ioc, psge);
        } else if (data_out_sz && data_in_sz) {
                /* WRITE sgel first */
                sgl_flags = (MPI2_SGE_FLAGS_SIMPLE_ELEMENT |
                    MPI2_SGE_FLAGS_END_OF_BUFFER | MPI2_SGE_FLAGS_HOST_TO_IOC);
                sgl_flags = sgl_flags << MPI2_SGE_FLAGS_SHIFT;
                ioc->base_add_sg_single(psge, sgl_flags |
                    data_out_sz, data_out_dma);

                /* incr sgel */
                psge += ioc->sge_size;

                /* READ sgel last */
                sgl_flags = (MPI2_SGE_FLAGS_SIMPLE_ELEMENT |
                    MPI2_SGE_FLAGS_LAST_ELEMENT | MPI2_SGE_FLAGS_END_OF_BUFFER |
                    MPI2_SGE_FLAGS_END_OF_LIST);
                sgl_flags = sgl_flags << MPI2_SGE_FLAGS_SHIFT;
                ioc->base_add_sg_single(psge, sgl_flags |
                    data_in_sz, data_in_dma);
        } else if (data_out_sz) /* WRITE */ {
                sgl_flags = (MPI2_SGE_FLAGS_SIMPLE_ELEMENT |
                    MPI2_SGE_FLAGS_LAST_ELEMENT | MPI2_SGE_FLAGS_END_OF_BUFFER |
                    MPI2_SGE_FLAGS_END_OF_LIST | MPI2_SGE_FLAGS_HOST_TO_IOC);
                sgl_flags = sgl_flags << MPI2_SGE_FLAGS_SHIFT;
                ioc->base_add_sg_single(psge, sgl_flags |
                    data_out_sz, data_out_dma);
        } else if (data_in_sz) /* READ */ {
                sgl_flags = (MPI2_SGE_FLAGS_SIMPLE_ELEMENT |
                    MPI2_SGE_FLAGS_LAST_ELEMENT | MPI2_SGE_FLAGS_END_OF_BUFFER |
                    MPI2_SGE_FLAGS_END_OF_LIST);
                sgl_flags = sgl_flags << MPI2_SGE_FLAGS_SHIFT;
                ioc->base_add_sg_single(psge, sgl_flags |
                    data_in_sz, data_in_dma);
        }

        /* send command to firmware */
#ifdef CONFIG_SCSI_MPT2SAS_LOGGING
        _ctl_display_some_debug(ioc, smid, "ctl_request", NULL);
#endif

        switch (mpi_request->Function) {
        case MPI2_FUNCTION_SCSI_IO_REQUEST:
        case MPI2_FUNCTION_RAID_SCSI_IO_PASSTHROUGH:
        {
                Mpi2SCSIIORequest_t *scsiio_request =
                    (Mpi2SCSIIORequest_t *)mpi_request;
                scsiio_request->SenseBufferLowAddress =
                    (u32)mpt2sas_base_get_sense_buffer_dma(ioc, smid);
                priv_sense = mpt2sas_base_get_sense_buffer(ioc, smid);
                memset(priv_sense, 0, SCSI_SENSE_BUFFERSIZE);
                mpt2sas_base_put_smid_scsi_io(ioc, smid,
                    le16_to_cpu(mpi_request->FunctionDependent1));
                break;
        }
        case MPI2_FUNCTION_SCSI_TASK_MGMT:
        {
                Mpi2SCSITaskManagementRequest_t *tm_request =
                    (Mpi2SCSITaskManagementRequest_t *)mpi_request;

                if (tm_request->TaskType ==
                    MPI2_SCSITASKMGMT_TASKTYPE_ABORT_TASK ||
                    tm_request->TaskType ==
                    MPI2_SCSITASKMGMT_TASKTYPE_QUERY_TASK) {
                        if (_ctl_set_task_mid(ioc, &karg, tm_request)) {
                                mpt2sas_base_free_smid(ioc, smid);
                                goto out;
                        }
                }

                mutex_lock(&ioc->tm_cmds.mutex);
                mpt2sas_scsih_set_tm_flag(ioc, le16_to_cpu(
                    tm_request->DevHandle));
                mpt2sas_base_put_smid_hi_priority(ioc, smid);
                break;
        }
        case MPI2_FUNCTION_SMP_PASSTHROUGH:
        {
                Mpi2SmpPassthroughRequest_t *smp_request =
                    (Mpi2SmpPassthroughRequest_t *)mpi_request;
                u8 *data;

                /* ioc determines which port to use */
                smp_request->PhysicalPort = 0xFF;
                if (smp_request->PassthroughFlags &
                    MPI2_SMP_PT_REQ_PT_FLAGS_IMMEDIATE)
                        data = (u8 *)&smp_request->SGL;
                else
                        data = data_out;

                if (data[1] == 0x91 && (data[10] == 1 || data[10] == 2)) {
                        ioc->ioc_link_reset_in_progress = 1;
                        ioc->ignore_loginfos = 1;
                }
                mpt2sas_base_put_smid_default(ioc, smid);
                break;
        }
        case MPI2_FUNCTION_SAS_IO_UNIT_CONTROL:
        {
                Mpi2SasIoUnitControlRequest_t *sasiounit_request =
                    (Mpi2SasIoUnitControlRequest_t *)mpi_request;

                if (sasiounit_request->Operation == MPI2_SAS_OP_PHY_HARD_RESET
                    || sasiounit_request->Operation ==
                    MPI2_SAS_OP_PHY_LINK_RESET) {
                        ioc->ioc_link_reset_in_progress = 1;
                        ioc->ignore_loginfos = 1;
                }
                mpt2sas_base_put_smid_default(ioc, smid);
                break;
        }
        default:
                mpt2sas_base_put_smid_default(ioc, smid);
                break;
        }

        if (karg.timeout < MPT2_IOCTL_DEFAULT_TIMEOUT)
                timeout = MPT2_IOCTL_DEFAULT_TIMEOUT;
        else
                timeout = karg.timeout;
        init_completion(&ioc->ctl_cmds.done);
        timeleft = wait_for_completion_timeout(&ioc->ctl_cmds.done,
            timeout*HZ);
        if (mpi_request->Function == MPI2_FUNCTION_SCSI_TASK_MGMT) {
                Mpi2SCSITaskManagementRequest_t *tm_request =
                    (Mpi2SCSITaskManagementRequest_t *)mpi_request;
                mutex_unlock(&ioc->tm_cmds.mutex);
                mpt2sas_scsih_clear_tm_flag(ioc, le16_to_cpu(
                    tm_request->DevHandle));
        } else if ((mpi_request->Function == MPI2_FUNCTION_SMP_PASSTHROUGH ||
            mpi_request->Function == MPI2_FUNCTION_SAS_IO_UNIT_CONTROL) &&
                ioc->ioc_link_reset_in_progress) {
                ioc->ioc_link_reset_in_progress = 0;
                ioc->ignore_loginfos = 0;
        }
        if (!(ioc->ctl_cmds.status & MPT2_CMD_COMPLETE)) {
                printk(MPT2SAS_ERR_FMT "%s: timeout\n", ioc->name,
                    __func__);
                _debug_dump_mf(mpi_request, karg.data_sge_offset);
                if (!(ioc->ctl_cmds.status & MPT2_CMD_RESET))
                        issue_reset = 1;
                goto issue_host_reset;
        }

        mpi_reply = ioc->ctl_cmds.reply;
        ioc_status = le16_to_cpu(mpi_reply->IOCStatus) & MPI2_IOCSTATUS_MASK;

#ifdef CONFIG_SCSI_MPT2SAS_LOGGING
        if (mpi_reply->Function == MPI2_FUNCTION_SCSI_TASK_MGMT &&
            (ioc->logging_level & MPT_DEBUG_TM)) {
                Mpi2SCSITaskManagementReply_t *tm_reply =
                    (Mpi2SCSITaskManagementReply_t *)mpi_reply;

                printk(MPT2SAS_DEBUG_FMT "TASK_MGMT: "
                    "IOCStatus(0x%04x), IOCLogInfo(0x%08x), "
                    "TerminationCount(0x%08x)\n", ioc->name,
                    tm_reply->IOCStatus, tm_reply->IOCLogInfo,
                    tm_reply->TerminationCount);
        }
#endif
        /* copy out xdata to user */
        if (data_in_sz) {
                if (copy_to_user(karg.data_in_buf_ptr, data_in,
                    data_in_sz)) {
                        printk(KERN_ERR "failure at %s:%d/%s()!\n", __FILE__,
                            __LINE__, __func__);
                        ret = -ENODATA;
                        goto out;
                }
        }

        /* copy out reply message frame to user */
        if (karg.max_reply_bytes) {
                sz = min_t(u32, karg.max_reply_bytes, ioc->reply_sz);
                if (copy_to_user(karg.reply_frame_buf_ptr, ioc->ctl_cmds.reply,
                    sz)) {
                        printk(KERN_ERR "failure at %s:%d/%s()!\n", __FILE__,
                            __LINE__, __func__);
                        ret = -ENODATA;
                        goto out;
                }
        }

        /* copy out sense to user */
        if (karg.max_sense_bytes && (mpi_request->Function ==
            MPI2_FUNCTION_SCSI_IO_REQUEST || mpi_request->Function ==
            MPI2_FUNCTION_RAID_SCSI_IO_PASSTHROUGH)) {
                sz = min_t(u32, karg.max_sense_bytes, SCSI_SENSE_BUFFERSIZE);
                if (copy_to_user(karg.sense_data_ptr, priv_sense, sz)) {
                        printk(KERN_ERR "failure at %s:%d/%s()!\n", __FILE__,
                            __LINE__, __func__);
                        ret = -ENODATA;
                        goto out;
                }
        }

 issue_host_reset:
        if (issue_reset) {
                if ((mpi_request->Function == MPI2_FUNCTION_SCSI_IO_REQUEST ||
                    mpi_request->Function ==
                    MPI2_FUNCTION_RAID_SCSI_IO_PASSTHROUGH)) {
                        printk(MPT2SAS_INFO_FMT "issue target reset: handle "
                            "= (0x%04x)\n", ioc->name,
                            mpi_request->FunctionDependent1);
                        mutex_lock(&ioc->tm_cmds.mutex);
                        mpt2sas_scsih_issue_tm(ioc,
                            mpi_request->FunctionDependent1, 0,
                            MPI2_SCSITASKMGMT_TASKTYPE_TARGET_RESET, 0, 10);
                        ioc->tm_cmds.status = MPT2_CMD_NOT_USED;
                        mutex_unlock(&ioc->tm_cmds.mutex);
                } else
                        mpt2sas_base_hard_reset_handler(ioc, CAN_SLEEP,
                            FORCE_BIG_HAMMER);
        }

 out:

        /* free memory associated with sg buffers */
        if (data_in)
                pci_free_consistent(ioc->pdev, data_in_sz, data_in,
                    data_in_dma);

        if (data_out)
                pci_free_consistent(ioc->pdev, data_out_sz, data_out,
                    data_out_dma);

        ioc->ctl_cmds.status = MPT2_CMD_NOT_USED;
        mutex_unlock(&ioc->ctl_cmds.mutex);
        return ret;
}

/**
 * _ctl_getiocinfo - main handler for MPT2IOCINFO opcode
 * @arg - user space buffer containing ioctl content
 */
static long
_ctl_getiocinfo(void __user *arg)
{
        struct mpt2_ioctl_iocinfo karg;
        struct MPT2SAS_ADAPTER *ioc;
        u8 revision;

        if (copy_from_user(&karg, arg, sizeof(karg))) {
                printk(KERN_ERR "failure at %s:%d/%s()!\n",
                    __FILE__, __LINE__, __func__);
                return -EFAULT;
        }
        if (_ctl_verify_adapter(karg.hdr.ioc_number, &ioc) == -1 || !ioc)
                return -ENODEV;

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

        memset(&karg, 0 , sizeof(karg));
        karg.adapter_type = MPT2_IOCTL_INTERFACE_SAS2;
        if (ioc->pfacts)
                karg.port_number = ioc->pfacts[0].PortNumber;
        pci_read_config_byte(ioc->pdev, PCI_CLASS_REVISION, &revision);
        karg.hw_rev = revision;
        karg.pci_id = ioc->pdev->device;
        karg.subsystem_device = ioc->pdev->subsystem_device;
        karg.subsystem_vendor = ioc->pdev->subsystem_vendor;
        karg.pci_information.u.bits.bus = ioc->pdev->bus->number;
        karg.pci_information.u.bits.device = PCI_SLOT(ioc->pdev->devfn);
        karg.pci_information.u.bits.function = PCI_FUNC(ioc->pdev->devfn);
        karg.pci_information.segment_id = pci_domain_nr(ioc->pdev->bus);
        karg.firmware_version = ioc->facts.FWVersion.Word;
        strcpy(karg.driver_version, MPT2SAS_DRIVER_NAME);
        strcat(karg.driver_version, "-");
        strcat(karg.driver_version, MPT2SAS_DRIVER_VERSION);
        karg.bios_version = le32_to_cpu(ioc->bios_pg3.BiosVersion);

        if (copy_to_user(arg, &karg, sizeof(karg))) {
                printk(KERN_ERR "failure at %s:%d/%s()!\n",
                    __FILE__, __LINE__, __func__);
                return -EFAULT;
        }
        return 0;
}

/**
 * _ctl_eventquery - main handler for MPT2EVENTQUERY opcode
 * @arg - user space buffer containing ioctl content
 */
static long
_ctl_eventquery(void __user *arg)
{
        struct mpt2_ioctl_eventquery karg;
        struct MPT2SAS_ADAPTER *ioc;

        if (copy_from_user(&karg, arg, sizeof(karg))) {
                printk(KERN_ERR "failure at %s:%d/%s()!\n",
                    __FILE__, __LINE__, __func__);
                return -EFAULT;
        }
        if (_ctl_verify_adapter(karg.hdr.ioc_number, &ioc) == -1 || !ioc)
                return -ENODEV;

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

        karg.event_entries = MPT2SAS_CTL_EVENT_LOG_SIZE;
        memcpy(karg.event_types, ioc->event_type,
            MPI2_EVENT_NOTIFY_EVENTMASK_WORDS * sizeof(u32));

        if (copy_to_user(arg, &karg, sizeof(karg))) {

                printk(KERN_ERR "failure at %s:%d/%s()!\n",
                    __FILE__, __LINE__, __func__);
                return -EFAULT;
        }
        return 0;
}

/**
 * _ctl_eventenable - main handler for MPT2EVENTENABLE opcode
 * @arg - user space buffer containing ioctl content
 */
static long
_ctl_eventenable(void __user *arg)
{
        struct mpt2_ioctl_eventenable karg;
        struct MPT2SAS_ADAPTER *ioc;

        if (copy_from_user(&karg, arg, sizeof(karg))) {
                printk(KERN_ERR "failure at %s:%d/%s()!\n",
                    __FILE__, __LINE__, __func__);
                return -EFAULT;
        }
        if (_ctl_verify_adapter(karg.hdr.ioc_number, &ioc) == -1 || !ioc)
                return -ENODEV;

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

        if (ioc->event_log)
                return 0;
        memcpy(ioc->event_type, karg.event_types,
            MPI2_EVENT_NOTIFY_EVENTMASK_WORDS * sizeof(u32));
        mpt2sas_base_validate_event_type(ioc, ioc->event_type);

        /* initialize event_log */
        ioc->event_context = 0;
        ioc->aen_event_read_flag = 0;
        ioc->event_log = kcalloc(MPT2SAS_CTL_EVENT_LOG_SIZE,
            sizeof(struct MPT2_IOCTL_EVENTS), GFP_KERNEL);
        if (!ioc->event_log) {
                printk(KERN_ERR "failure at %s:%d/%s()!\n",
                    __FILE__, __LINE__, __func__);
                return -ENOMEM;
        }
        return 0;
}

/**
 * _ctl_eventreport - main handler for MPT2EVENTREPORT opcode
 * @arg - user space buffer containing ioctl content
 */
static long
_ctl_eventreport(void __user *arg)
{
        struct mpt2_ioctl_eventreport karg;
        struct MPT2SAS_ADAPTER *ioc;
        u32 number_bytes, max_events, max;
        struct mpt2_ioctl_eventreport __user *uarg = arg;

        if (copy_from_user(&karg, arg, sizeof(karg))) {
                printk(KERN_ERR "failure at %s:%d/%s()!\n",
                    __FILE__, __LINE__, __func__);
                return -EFAULT;
        }
        if (_ctl_verify_adapter(karg.hdr.ioc_number, &ioc) == -1 || !ioc)
                return -ENODEV;

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

        number_bytes = karg.hdr.max_data_size -
            sizeof(struct mpt2_ioctl_header);
        max_events = number_bytes/sizeof(struct MPT2_IOCTL_EVENTS);
        max = min_t(u32, MPT2SAS_CTL_EVENT_LOG_SIZE, max_events);

        /* If fewer than 1 event is requested, there must have
         * been some type of error.
         */
        if (!max || !ioc->event_log)
                return -ENODATA;

        number_bytes = max * sizeof(struct MPT2_IOCTL_EVENTS);
        if (copy_to_user(uarg->event_data, ioc->event_log, number_bytes)) {
                printk(KERN_ERR "failure at %s:%d/%s()!\n",
                    __FILE__, __LINE__, __func__);
                return -EFAULT;
        }

        /* reset flag so SIGIO can restart */
        ioc->aen_event_read_flag = 0;
        return 0;
}

/**
 * _ctl_do_reset - main handler for MPT2HARDRESET opcode
 * @arg - user space buffer containing ioctl content
 */
static long
_ctl_do_reset(void __user *arg)
{
        struct mpt2_ioctl_diag_reset karg;
        struct MPT2SAS_ADAPTER *ioc;
        int retval;

        if (copy_from_user(&karg, arg, sizeof(karg))) {
                printk(KERN_ERR "failure at %s:%d/%s()!\n",
                    __FILE__, __LINE__, __func__);
                return -EFAULT;
        }
        if (_ctl_verify_adapter(karg.hdr.ioc_number, &ioc) == -1 || !ioc)
                return -ENODEV;

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

        retval = mpt2sas_base_hard_reset_handler(ioc, CAN_SLEEP,
            FORCE_BIG_HAMMER);
        printk(MPT2SAS_INFO_FMT "host reset: %s\n",
            ioc->name, ((!retval) ? "SUCCESS" : "FAILED"));
        return 0;
}

/**
 * _ctl_btdh_search_sas_device - searching for sas device
 * @ioc: per adapter object
 * @btdh: btdh ioctl payload
 */
static int
_ctl_btdh_search_sas_device(struct MPT2SAS_ADAPTER *ioc,
    struct mpt2_ioctl_btdh_mapping *btdh)
{
        struct _sas_device *sas_device;
        unsigned long flags;
        int rc = 0;

        if (list_empty(&ioc->sas_device_list))
                return rc;

        spin_lock_irqsave(&ioc->sas_device_lock, flags);
        list_for_each_entry(sas_device, &ioc->sas_device_list, list) {
                if (btdh->bus == 0xFFFFFFFF && btdh->id == 0xFFFFFFFF &&
                    btdh->handle == sas_device->handle) {
                        btdh->bus = sas_device->channel;
                        btdh->id = sas_device->id;
                        rc = 1;
                        goto out;
                } else if (btdh->bus == sas_device->channel && btdh->id ==
                    sas_device->id && btdh->handle == 0xFFFF) {
                        btdh->handle = sas_device->handle;
                        rc = 1;
                        goto out;
                }
        }
 out:
        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
        return rc;
}

/**
 * _ctl_btdh_search_raid_device - searching for raid device
 * @ioc: per adapter object
 * @btdh: btdh ioctl payload
 */
static int
_ctl_btdh_search_raid_device(struct MPT2SAS_ADAPTER *ioc,
    struct mpt2_ioctl_btdh_mapping *btdh)
{
        struct _raid_device *raid_device;
        unsigned long flags;
        int rc = 0;

        if (list_empty(&ioc->raid_device_list))
                return rc;

        spin_lock_irqsave(&ioc->raid_device_lock, flags);
        list_for_each_entry(raid_device, &ioc->raid_device_list, list) {
                if (btdh->bus == 0xFFFFFFFF && btdh->id == 0xFFFFFFFF &&
                    btdh->handle == raid_device->handle) {
                        btdh->bus = raid_device->channel;
                        btdh->id = raid_device->id;
                        rc = 1;
                        goto out;
                } else if (btdh->bus == raid_device->channel && btdh->id ==
                    raid_device->id && btdh->handle == 0xFFFF) {
                        btdh->handle = raid_device->handle;
                        rc = 1;
                        goto out;
                }
        }
 out:
        spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
        return rc;
}

/**
 * _ctl_btdh_mapping - main handler for MPT2BTDHMAPPING opcode
 * @arg - user space buffer containing ioctl content
 */
static long
_ctl_btdh_mapping(void __user *arg)
{
        struct mpt2_ioctl_btdh_mapping karg;
        struct MPT2SAS_ADAPTER *ioc;
        int rc;

        if (copy_from_user(&karg, arg, sizeof(karg))) {
                printk(KERN_ERR "failure at %s:%d/%s()!\n",
                    __FILE__, __LINE__, __func__);
                return -EFAULT;
        }
        if (_ctl_verify_adapter(karg.hdr.ioc_number, &ioc) == -1 || !ioc)
                return -ENODEV;

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

        rc = _ctl_btdh_search_sas_device(ioc, &karg);
        if (!rc)
                _ctl_btdh_search_raid_device(ioc, &karg);

        if (copy_to_user(arg, &karg, sizeof(karg))) {
                printk(KERN_ERR "failure at %s:%d/%s()!\n",
                    __FILE__, __LINE__, __func__);
                return -EFAULT;
        }
        return 0;
}

/**
 * _ctl_diag_capability - return diag buffer capability
 * @ioc: per adapter object
 * @buffer_type: specifies either TRACE or SNAPSHOT
 *
 * returns 1 when diag buffer support is enabled in firmware
 */
static u8
_ctl_diag_capability(struct MPT2SAS_ADAPTER *ioc, u8 buffer_type)
{
        u8 rc = 0;

        switch (buffer_type) {
        case MPI2_DIAG_BUF_TYPE_TRACE:
                if (ioc->facts.IOCCapabilities &
                    MPI2_IOCFACTS_CAPABILITY_DIAG_TRACE_BUFFER)
                        rc = 1;
                break;
        case MPI2_DIAG_BUF_TYPE_SNAPSHOT:
                if (ioc->facts.IOCCapabilities &
                    MPI2_IOCFACTS_CAPABILITY_SNAPSHOT_BUFFER)
                        rc = 1;
                break;
        }

        return rc;
}

/**
 * _ctl_diag_register - application register with driver
 * @arg - user space buffer containing ioctl content
 * @state - NON_BLOCKING or BLOCKING
 *
 * This will allow the driver to setup any required buffers that will be
 * needed by firmware to communicate with the driver.
 */
static long
_ctl_diag_register(void __user *arg, enum block_state state)
{
        struct mpt2_diag_register karg;
        struct MPT2SAS_ADAPTER *ioc;
        int rc, i;
        void *request_data = NULL;
        dma_addr_t request_data_dma;
        u32 request_data_sz = 0;
        Mpi2DiagBufferPostRequest_t *mpi_request;
        Mpi2DiagBufferPostReply_t *mpi_reply;
        u8 buffer_type;
        unsigned long timeleft;
        u16 smid;
        u16 ioc_status;
        u8 issue_reset = 0;

        if (copy_from_user(&karg, arg, sizeof(karg))) {
                printk(KERN_ERR "failure at %s:%d/%s()!\n",
                    __FILE__, __LINE__, __func__);
                return -EFAULT;
        }
        if (_ctl_verify_adapter(karg.hdr.ioc_number, &ioc) == -1 || !ioc)
                return -ENODEV;

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

        buffer_type = karg.buffer_type;
        if (!_ctl_diag_capability(ioc, buffer_type)) {
                printk(MPT2SAS_ERR_FMT "%s: doesn't have capability for "
                    "buffer_type(0x%02x)\n", ioc->name, __func__, buffer_type);
                return -EPERM;
        }

        if (ioc->diag_buffer_status[buffer_type] &
            MPT2_DIAG_BUFFER_IS_REGISTERED) {
                printk(MPT2SAS_ERR_FMT "%s: already has a registered "
                    "buffer for buffer_type(0x%02x)\n", ioc->name, __func__,
                    buffer_type);
                return -EINVAL;
        }

        if (karg.requested_buffer_size % 4)  {
                printk(MPT2SAS_ERR_FMT "%s: the requested_buffer_size "
                    "is not 4 byte aligned\n", ioc->name, __func__);
                return -EINVAL;
        }

        if (state == NON_BLOCKING && !mutex_trylock(&ioc->ctl_cmds.mutex))
                return -EAGAIN;
        else if (mutex_lock_interruptible(&ioc->ctl_cmds.mutex))
                return -ERESTARTSYS;

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

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

        rc = 0;
        ioc->ctl_cmds.status = MPT2_CMD_PENDING;
        memset(ioc->ctl_cmds.reply, 0, ioc->reply_sz);
        mpi_request = mpt2sas_base_get_msg_frame(ioc, smid);
        ioc->ctl_cmds.smid = smid;

        request_data = ioc->diag_buffer[buffer_type];
        request_data_sz = karg.requested_buffer_size;
        ioc->unique_id[buffer_type] = karg.unique_id;
        ioc->diag_buffer_status[buffer_type] = 0;
        memcpy(ioc->product_specific[buffer_type], karg.product_specific,
            MPT2_PRODUCT_SPECIFIC_DWORDS);
        ioc->diagnostic_flags[buffer_type] = karg.diagnostic_flags;

        if (request_data) {
                request_data_dma = ioc->diag_buffer_dma[buffer_type];
                if (request_data_sz != ioc->diag_buffer_sz[buffer_type]) {
                        pci_free_consistent(ioc->pdev,
                            ioc->diag_buffer_sz[buffer_type],
                            request_data, request_data_dma);
                        request_data = NULL;
                }
        }

        if (request_data == NULL) {
                ioc->diag_buffer_sz[buffer_type] = 0;
                ioc->diag_buffer_dma[buffer_type] = 0;
                request_data = pci_alloc_consistent(
                        ioc->pdev, request_data_sz, &request_data_dma);
                if (request_data == NULL) {
                        printk(MPT2SAS_ERR_FMT "%s: failed allocating memory"
                            " for diag buffers, requested size(%d)\n",
                            ioc->name, __func__, request_data_sz);
                        mpt2sas_base_free_smid(ioc, smid);
                        return -ENOMEM;
                }
                ioc->diag_buffer[buffer_type] = request_data;
                ioc->diag_buffer_sz[buffer_type] = request_data_sz;
                ioc->diag_buffer_dma[buffer_type] = request_data_dma;
        }

        mpi_request->Function = MPI2_FUNCTION_DIAG_BUFFER_POST;
        mpi_request->BufferType = karg.buffer_type;
        mpi_request->Flags = cpu_to_le32(karg.diagnostic_flags);
        mpi_request->BufferAddress = cpu_to_le64(request_data_dma);
        mpi_request->BufferLength = cpu_to_le32(request_data_sz);
        mpi_request->VF_ID = 0; /* TODO */
        mpi_request->VP_ID = 0;

        dctlprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s: diag_buffer(0x%p), "
            "dma(0x%llx), sz(%d)\n", ioc->name, __func__, request_data,
            (unsigned long long)request_data_dma, mpi_request->BufferLength));

        for (i = 0; i < MPT2_PRODUCT_SPECIFIC_DWORDS; i++)
                mpi_request->ProductSpecific[i] =
                        cpu_to_le32(ioc->product_specific[buffer_type][i]);

        mpt2sas_base_put_smid_default(ioc, smid);
        init_completion(&ioc->ctl_cmds.done);
        timeleft = wait_for_completion_timeout(&ioc->ctl_cmds.done,
            MPT2_IOCTL_DEFAULT_TIMEOUT*HZ);

        if (!(ioc->ctl_cmds.status & MPT2_CMD_COMPLETE)) {
                printk(MPT2SAS_ERR_FMT "%s: timeout\n", ioc->name,
                    __func__);
                _debug_dump_mf(mpi_request,
                    sizeof(Mpi2DiagBufferPostRequest_t)/4);
                if (!(ioc->ctl_cmds.status & MPT2_CMD_RESET))
                        issue_reset = 1;
                goto issue_host_reset;
        }

        /* process the completed Reply Message Frame */
        if ((ioc->ctl_cmds.status & MPT2_CMD_REPLY_VALID) == 0) {
                printk(MPT2SAS_ERR_FMT "%s: no reply message\n",
                    ioc->name, __func__);
                rc = -EFAULT;
                goto out;
        }

        mpi_reply = ioc->ctl_cmds.reply;
        ioc_status = le16_to_cpu(mpi_reply->IOCStatus) & MPI2_IOCSTATUS_MASK;

        if (ioc_status == MPI2_IOCSTATUS_SUCCESS) {
                ioc->diag_buffer_status[buffer_type] |=
                        MPT2_DIAG_BUFFER_IS_REGISTERED;
                dctlprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s: success\n",
                    ioc->name, __func__));
        } else {
                printk(MPT2SAS_DEBUG_FMT "%s: ioc_status(0x%04x) "
                    "log_info(0x%08x)\n", ioc->name, __func__,
                    ioc_status, mpi_reply->IOCLogInfo);
                rc = -EFAULT;
        }

 issue_host_reset:
        if (issue_reset)
                mpt2sas_base_hard_reset_handler(ioc, CAN_SLEEP,
                    FORCE_BIG_HAMMER);

 out:

        if (rc && request_data)
                pci_free_consistent(ioc->pdev, request_data_sz,
                    request_data, request_data_dma);

        ioc->ctl_cmds.status = MPT2_CMD_NOT_USED;
        mutex_unlock(&ioc->ctl_cmds.mutex);
        return rc;
}

/**
 * _ctl_diag_unregister - application unregister with driver
 * @arg - user space buffer containing ioctl content
 *
 * This will allow the driver to cleanup any memory allocated for diag
 * messages and to free up any resources.
 */
static long
_ctl_diag_unregister(void __user *arg)
{
        struct mpt2_diag_unregister karg;
        struct MPT2SAS_ADAPTER *ioc;
        void *request_data;
        dma_addr_t request_data_dma;
        u32 request_data_sz;
        u8 buffer_type;

        if (copy_from_user(&karg, arg, sizeof(karg))) {
                printk(KERN_ERR "failure at %s:%d/%s()!\n",
                    __FILE__, __LINE__, __func__);
                return -EFAULT;
        }
        if (_ctl_verify_adapter(karg.hdr.ioc_number, &ioc) == -1 || !ioc)
                return -ENODEV;

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

        buffer_type = karg.unique_id & 0x000000ff;
        if (!_ctl_diag_capability(ioc, buffer_type)) {
                printk(MPT2SAS_ERR_FMT "%s: doesn't have capability for "
                    "buffer_type(0x%02x)\n", ioc->name, __func__, buffer_type);
                return -EPERM;
        }

        if ((ioc->diag_buffer_status[buffer_type] &
            MPT2_DIAG_BUFFER_IS_REGISTERED) == 0) {
                printk(MPT2SAS_ERR_FMT "%s: buffer_type(0x%02x) is not "
                    "registered\n", ioc->name, __func__, buffer_type);
                return -EINVAL;
        }
        if ((ioc->diag_buffer_status[buffer_type] &
            MPT2_DIAG_BUFFER_IS_RELEASED) == 0) {
                printk(MPT2SAS_ERR_FMT "%s: buffer_type(0x%02x) has not been "
                    "released\n", ioc->name, __func__, buffer_type);
                return -EINVAL;
        }

        if (karg.unique_id != ioc->unique_id[buffer_type]) {
                printk(MPT2SAS_ERR_FMT "%s: unique_id(0x%08x) is not "
                    "registered\n", ioc->name, __func__, karg.unique_id);
                return -EINVAL;
        }

        request_data = ioc->diag_buffer[buffer_type];
        if (!request_data) {
                printk(MPT2SAS_ERR_FMT "%s: doesn't have memory allocated for "
                    "buffer_type(0x%02x)\n", ioc->name, __func__, buffer_type);
                return -ENOMEM;
        }

        request_data_sz = ioc->diag_buffer_sz[buffer_type];
        request_data_dma = ioc->diag_buffer_dma[buffer_type];
        pci_free_consistent(ioc->pdev, request_data_sz,
            request_data, request_data_dma);
        ioc->diag_buffer[buffer_type] = NULL;
        ioc->diag_buffer_status[buffer_type] = 0;
        return 0;
}

/**
 * _ctl_diag_query - query relevant info associated with diag buffers
 * @arg - user space buffer containing ioctl content
 *
 * The application will send only buffer_type and unique_id.  Driver will
 * inspect unique_id first, if valid, fill in all the info.  If unique_id is
 * 0x00, the driver will return info specified by Buffer Type.
 */
static long
_ctl_diag_query(void __user *arg)
{
        struct mpt2_diag_query karg;
        struct MPT2SAS_ADAPTER *ioc;
        void *request_data;
        int i;
        u8 buffer_type;

        if (copy_from_user(&karg, arg, sizeof(karg))) {
                printk(KERN_ERR "failure at %s:%d/%s()!\n",
                    __FILE__, __LINE__, __func__);
                return -EFAULT;
        }
        if (_ctl_verify_adapter(karg.hdr.ioc_number, &ioc) == -1 || !ioc)
                return -ENODEV;

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

        karg.application_flags = 0;
        buffer_type = karg.buffer_type;

        if (!_ctl_diag_capability(ioc, buffer_type)) {
                printk(MPT2SAS_ERR_FMT "%s: doesn't have capability for "
                    "buffer_type(0x%02x)\n", ioc->name, __func__, buffer_type);
                return -EPERM;
        }

        if ((ioc->diag_buffer_status[buffer_type] &
            MPT2_DIAG_BUFFER_IS_REGISTERED) == 0) {
                printk(MPT2SAS_ERR_FMT "%s: buffer_type(0x%02x) is not "
                    "registered\n", ioc->name, __func__, buffer_type);
                return -EINVAL;
        }

        if (karg.unique_id & 0xffffff00) {
                if (karg.unique_id != ioc->unique_id[buffer_type]) {
                        printk(MPT2SAS_ERR_FMT "%s: unique_id(0x%08x) is not "
                            "registered\n", ioc->name, __func__,
                            karg.unique_id);
                        return -EINVAL;
                }
        }

        request_data = ioc->diag_buffer[buffer_type];
        if (!request_data) {
                printk(MPT2SAS_ERR_FMT "%s: doesn't have buffer for "
                    "buffer_type(0x%02x)\n", ioc->name, __func__, buffer_type);
                return -ENOMEM;
        }

        if (ioc->diag_buffer_status[buffer_type] & MPT2_DIAG_BUFFER_IS_RELEASED)
                karg.application_flags = (MPT2_APP_FLAGS_APP_OWNED |
                    MPT2_APP_FLAGS_BUFFER_VALID);
        else
                karg.application_flags = (MPT2_APP_FLAGS_APP_OWNED |
                    MPT2_APP_FLAGS_BUFFER_VALID |
                    MPT2_APP_FLAGS_FW_BUFFER_ACCESS);

        for (i = 0; i < MPT2_PRODUCT_SPECIFIC_DWORDS; i++)
                karg.product_specific[i] =
                    ioc->product_specific[buffer_type][i];

        karg.total_buffer_size = ioc->diag_buffer_sz[buffer_type];
        karg.driver_added_buffer_size = 0;
        karg.unique_id = ioc->unique_id[buffer_type];
        karg.diagnostic_flags = ioc->diagnostic_flags[buffer_type];

        if (copy_to_user(arg, &karg, sizeof(struct mpt2_diag_query))) {
                printk(MPT2SAS_ERR_FMT "%s: unable to write mpt2_diag_query "
                    "data @ %p\n", ioc->name, __func__, arg);
                return -EFAULT;
        }
        return 0;
}

/**
 * _ctl_send_release - Diag Release Message
 * @ioc: per adapter object
 * @buffer_type - specifies either TRACE or SNAPSHOT
 * @issue_reset - specifies whether host reset is required.
 *
 */
static int
_ctl_send_release(struct MPT2SAS_ADAPTER *ioc, u8 buffer_type, u8 *issue_reset)
{
        Mpi2DiagReleaseRequest_t *mpi_request;
        Mpi2DiagReleaseReply_t *mpi_reply;
        u16 smid;
        u16 ioc_status;
        u32 ioc_state;
        int rc;
        unsigned long timeleft;

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

        rc = 0;
        *issue_reset = 0;

        ioc_state = mpt2sas_base_get_iocstate(ioc, 1);
        if (ioc_state != MPI2_IOC_STATE_OPERATIONAL) {
                dctlprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s: "
                    "skipping due to FAULT state\n", ioc->name,
                    __func__));
                rc = -EAGAIN;
                goto out;
        }

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

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

        ioc->ctl_cmds.status = MPT2_CMD_PENDING;
        memset(ioc->ctl_cmds.reply, 0, ioc->reply_sz);
        mpi_request = mpt2sas_base_get_msg_frame(ioc, smid);
        ioc->ctl_cmds.smid = smid;

        mpi_request->Function = MPI2_FUNCTION_DIAG_RELEASE;
        mpi_request->BufferType = buffer_type;
        mpi_request->VF_ID = 0; /* TODO */
        mpi_request->VP_ID = 0;

        mpt2sas_base_put_smid_default(ioc, smid);
        init_completion(&ioc->ctl_cmds.done);
        timeleft = wait_for_completion_timeout(&ioc->ctl_cmds.done,
            MPT2_IOCTL_DEFAULT_TIMEOUT*HZ);

        if (!(ioc->ctl_cmds.status & MPT2_CMD_COMPLETE)) {
                printk(MPT2SAS_ERR_FMT "%s: timeout\n", ioc->name,
                    __func__);
                _debug_dump_mf(mpi_request,
                    sizeof(Mpi2DiagReleaseRequest_t)/4);
                if (!(ioc->ctl_cmds.status & MPT2_CMD_RESET))
                        *issue_reset = 1;
                rc = -EFAULT;
                goto out;
        }

        /* process the completed Reply Message Frame */
        if ((ioc->ctl_cmds.status & MPT2_CMD_REPLY_VALID) == 0) {
                printk(MPT2SAS_ERR_FMT "%s: no reply message\n",
                    ioc->name, __func__);
                rc = -EFAULT;
                goto out;
        }

        mpi_reply = ioc->ctl_cmds.reply;
        ioc_status = le16_to_cpu(mpi_reply->IOCStatus) & MPI2_IOCSTATUS_MASK;

        if (ioc_status == MPI2_IOCSTATUS_SUCCESS) {
                ioc->diag_buffer_status[buffer_type] |=
                    MPT2_DIAG_BUFFER_IS_RELEASED;
                dctlprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s: success\n",
                    ioc->name, __func__));
        } else {
                printk(MPT2SAS_DEBUG_FMT "%s: ioc_status(0x%04x) "
                    "log_info(0x%08x)\n", ioc->name, __func__,
                    ioc_status, mpi_reply->IOCLogInfo);
                rc = -EFAULT;
        }

 out:
        ioc->ctl_cmds.status = MPT2_CMD_NOT_USED;
        return rc;
}

/**
 * _ctl_diag_release - request to send Diag Release Message to firmware
 * @arg - user space buffer containing ioctl content
 * @state - NON_BLOCKING or BLOCKING
 *
 * This allows ownership of the specified buffer to returned to the driver,
 * allowing an application to read the buffer without fear that firmware is
 * overwritting information in the buffer.
 */
static long
_ctl_diag_release(void __user *arg, enum block_state state)
{
        struct mpt2_diag_release karg;
        struct MPT2SAS_ADAPTER *ioc;
        void *request_data;
        int rc;
        u8 buffer_type;
        u8 issue_reset = 0;

        if (copy_from_user(&karg, arg, sizeof(karg))) {
                printk(KERN_ERR "failure at %s:%d/%s()!\n",
                    __FILE__, __LINE__, __func__);
                return -EFAULT;
        }
        if (_ctl_verify_adapter(karg.hdr.ioc_number, &ioc) == -1 || !ioc)
                return -ENODEV;

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

        buffer_type = karg.unique_id & 0x000000ff;
        if (!_ctl_diag_capability(ioc, buffer_type)) {
                printk(MPT2SAS_ERR_FMT "%s: doesn't have capability for "
                    "buffer_type(0x%02x)\n", ioc->name, __func__, buffer_type);
                return -EPERM;
        }

        if ((ioc->diag_buffer_status[buffer_type] &
            MPT2_DIAG_BUFFER_IS_REGISTERED) == 0) {
                printk(MPT2SAS_ERR_FMT "%s: buffer_type(0x%02x) is not "
                    "registered\n", ioc->name, __func__, buffer_type);
                return -EINVAL;
        }

        if (karg.unique_id != ioc->unique_id[buffer_type]) {
                printk(MPT2SAS_ERR_FMT "%s: unique_id(0x%08x) is not "
                    "registered\n", ioc->name, __func__, karg.unique_id);
                return -EINVAL;
        }

        if (ioc->diag_buffer_status[buffer_type] &
            MPT2_DIAG_BUFFER_IS_RELEASED) {
                printk(MPT2SAS_ERR_FMT "%s: buffer_type(0x%02x) "
                    "is already released\n", ioc->name, __func__,
                    buffer_type);
                return 0;
        }

        request_data = ioc->diag_buffer[buffer_type];

        if (!request_data) {
                printk(MPT2SAS_ERR_FMT "%s: doesn't have memory allocated for "
                    "buffer_type(0x%02x)\n", ioc->name, __func__, buffer_type);
                return -ENOMEM;
        }

        /* buffers were released by due to host reset */
        if ((ioc->diag_buffer_status[buffer_type] &
            MPT2_DIAG_BUFFER_IS_DIAG_RESET)) {
                ioc->diag_buffer_status[buffer_type] |=
                    MPT2_DIAG_BUFFER_IS_RELEASED;
                ioc->diag_buffer_status[buffer_type] &=
                    ~MPT2_DIAG_BUFFER_IS_DIAG_RESET;
                printk(MPT2SAS_ERR_FMT "%s: buffer_type(0x%02x) "
                    "was released due to host reset\n", ioc->name, __func__,
                    buffer_type);
                return 0;
        }

        if (state == NON_BLOCKING && !mutex_trylock(&ioc->ctl_cmds.mutex))
                return -EAGAIN;
        else if (mutex_lock_interruptible(&ioc->ctl_cmds.mutex))
                return -ERESTARTSYS;

        rc = _ctl_send_release(ioc, buffer_type, &issue_reset);

        if (issue_reset)
                mpt2sas_base_hard_reset_handler(ioc, CAN_SLEEP,
                    FORCE_BIG_HAMMER);

        mutex_unlock(&ioc->ctl_cmds.mutex);
        return rc;
}

/**
 * _ctl_diag_read_buffer - request for copy of the diag buffer
 * @arg - user space buffer containing ioctl content
 * @state - NON_BLOCKING or BLOCKING
 */
static long
_ctl_diag_read_buffer(void __user *arg, enum block_state state)
{
        struct mpt2_diag_read_buffer karg;
        struct mpt2_diag_read_buffer __user *uarg = arg;
        struct MPT2SAS_ADAPTER *ioc;
        void *request_data, *diag_data;
        Mpi2DiagBufferPostRequest_t *mpi_request;
        Mpi2DiagBufferPostReply_t *mpi_reply;
        int rc, i;
        u8 buffer_type;
        unsigned long timeleft;
        u16 smid;
        u16 ioc_status;
        u8 issue_reset = 0;

        if (copy_from_user(&karg, arg, sizeof(karg))) {
                printk(KERN_ERR "failure at %s:%d/%s()!\n",
                    __FILE__, __LINE__, __func__);
                return -EFAULT;
        }
        if (_ctl_verify_adapter(karg.hdr.ioc_number, &ioc) == -1 || !ioc)
                return -ENODEV;

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

        buffer_type = karg.unique_id & 0x000000ff;
        if (!_ctl_diag_capability(ioc, buffer_type)) {
                printk(MPT2SAS_ERR_FMT "%s: doesn't have capability for "
                    "buffer_type(0x%02x)\n", ioc->name, __func__, buffer_type);
                return -EPERM;
        }

        if (karg.unique_id != ioc->unique_id[buffer_type]) {
                printk(MPT2SAS_ERR_FMT "%s: unique_id(0x%08x) is not "
                    "registered\n", ioc->name, __func__, karg.unique_id);
                return -EINVAL;
        }

        request_data = ioc->diag_buffer[buffer_type];
        if (!request_data) {
                printk(MPT2SAS_ERR_FMT "%s: doesn't have buffer for "
                    "buffer_type(0x%02x)\n", ioc->name, __func__, buffer_type);
                return -ENOMEM;
        }

        if ((karg.starting_offset % 4) || (karg.bytes_to_read % 4)) {
                printk(MPT2SAS_ERR_FMT "%s: either the starting_offset "
                    "or bytes_to_read are not 4 byte aligned\n", ioc->name,
                    __func__);
                return -EINVAL;
        }

        diag_data = (void *)(request_data + karg.starting_offset);
        dctlprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s: diag_buffer(%p), "
            "offset(%d), sz(%d)\n", ioc->name, __func__,
            diag_data, karg.starting_offset, karg.bytes_to_read));

        if (copy_to_user((void __user *)uarg->diagnostic_data,
            diag_data, karg.bytes_to_read)) {
                printk(MPT2SAS_ERR_FMT "%s: Unable to write "
                    "mpt_diag_read_buffer_t data @ %p\n", ioc->name,
                    __func__, diag_data);
                return -EFAULT;
        }

        if ((karg.flags & MPT2_FLAGS_REREGISTER) == 0)
                return 0;

        dctlprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s: Reregister "
                "buffer_type(0x%02x)\n", ioc->name, __func__, buffer_type));
        if ((ioc->diag_buffer_status[buffer_type] &
            MPT2_DIAG_BUFFER_IS_RELEASED) == 0) {
                dctlprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s: "
                    "buffer_type(0x%02x) is still registered\n", ioc->name,
                     __func__, buffer_type));
                return 0;
        }
        /* Get a free request frame and save the message context.
        */
        if (state == NON_BLOCKING && !mutex_trylock(&ioc->ctl_cmds.mutex))
                return -EAGAIN;
        else if (mutex_lock_interruptible(&ioc->ctl_cmds.mutex))
                return -ERESTARTSYS;

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

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

        rc = 0;
        ioc->ctl_cmds.status = MPT2_CMD_PENDING;
        memset(ioc->ctl_cmds.reply, 0, ioc->reply_sz);
        mpi_request = mpt2sas_base_get_msg_frame(ioc, smid);
        ioc->ctl_cmds.smid = smid;

        mpi_request->Function = MPI2_FUNCTION_DIAG_BUFFER_POST;
        mpi_request->BufferType = buffer_type;
        mpi_request->BufferLength =
            cpu_to_le32(ioc->diag_buffer_sz[buffer_type]);
        mpi_request->BufferAddress =
            cpu_to_le64(ioc->diag_buffer_dma[buffer_type]);
        for (i = 0; i < MPT2_PRODUCT_SPECIFIC_DWORDS; i++)
                mpi_request->ProductSpecific[i] =
                        cpu_to_le32(ioc->product_specific[buffer_type][i]);
        mpi_request->VF_ID = 0; /* TODO */
        mpi_request->VP_ID = 0;

        mpt2sas_base_put_smid_default(ioc, smid);
        init_completion(&ioc->ctl_cmds.done);
        timeleft = wait_for_completion_timeout(&ioc->ctl_cmds.done,
            MPT2_IOCTL_DEFAULT_TIMEOUT*HZ);

        if (!(ioc->ctl_cmds.status & MPT2_CMD_COMPLETE)) {
                printk(MPT2SAS_ERR_FMT "%s: timeout\n", ioc->name,
                    __func__);
                _debug_dump_mf(mpi_request,
                    sizeof(Mpi2DiagBufferPostRequest_t)/4);
                if (!(ioc->ctl_cmds.status & MPT2_CMD_RESET))
                        issue_reset = 1;
                goto issue_host_reset;
        }

        /* process the completed Reply Message Frame */
        if ((ioc->ctl_cmds.status & MPT2_CMD_REPLY_VALID) == 0) {
                printk(MPT2SAS_ERR_FMT "%s: no reply message\n",
                    ioc->name, __func__);
                rc = -EFAULT;
                goto out;
        }

        mpi_reply = ioc->ctl_cmds.reply;
        ioc_status = le16_to_cpu(mpi_reply->IOCStatus) & MPI2_IOCSTATUS_MASK;

        if (ioc_status == MPI2_IOCSTATUS_SUCCESS) {
                ioc->diag_buffer_status[buffer_type] |=
                    MPT2_DIAG_BUFFER_IS_REGISTERED;
                dctlprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s: success\n",
                    ioc->name, __func__));
        } else {
                printk(MPT2SAS_DEBUG_FMT "%s: ioc_status(0x%04x) "
                    "log_info(0x%08x)\n", ioc->name, __func__,
                    ioc_status, mpi_reply->IOCLogInfo);
                rc = -EFAULT;
        }

 issue_host_reset:
        if (issue_reset)
                mpt2sas_base_hard_reset_handler(ioc, CAN_SLEEP,
                    FORCE_BIG_HAMMER);

 out:

        ioc->ctl_cmds.status = MPT2_CMD_NOT_USED;
        mutex_unlock(&ioc->ctl_cmds.mutex);
        return rc;
}

/**
 * _ctl_ioctl_main - main ioctl entry point
 * @file - (struct file)
 * @cmd - ioctl opcode
 * @arg -
 */
static long
_ctl_ioctl_main(struct file *file, unsigned int cmd, void __user *arg)
{
        enum block_state state;
        long ret = -EINVAL;

        state = (file->f_flags & O_NONBLOCK) ? NON_BLOCKING :
            BLOCKING;

        switch (cmd) {
        case MPT2IOCINFO:
                if (_IOC_SIZE(cmd) == sizeof(struct mpt2_ioctl_iocinfo))
                        ret = _ctl_getiocinfo(arg);
                break;
        case MPT2COMMAND:
        {
                struct mpt2_ioctl_command karg;
                struct mpt2_ioctl_command __user *uarg;
                struct MPT2SAS_ADAPTER *ioc;

                if (copy_from_user(&karg, arg, sizeof(karg))) {
                        printk(KERN_ERR "failure at %s:%d/%s()!\n",
                            __FILE__, __LINE__, __func__);
                        return -EFAULT;
                }

                if (_ctl_verify_adapter(karg.hdr.ioc_number, &ioc) == -1 ||
                    !ioc)
                        return -ENODEV;

                if (ioc->shost_recovery)
                        return -EAGAIN;

                if (_IOC_SIZE(cmd) == sizeof(struct mpt2_ioctl_command)) {
                        uarg = arg;
                        ret = _ctl_do_mpt_command(ioc, karg, &uarg->mf, state);
                }
                break;
        }
        case MPT2EVENTQUERY:
                if (_IOC_SIZE(cmd) == sizeof(struct mpt2_ioctl_eventquery))
                        ret = _ctl_eventquery(arg);
                break;
        case MPT2EVENTENABLE:
                if (_IOC_SIZE(cmd) == sizeof(struct mpt2_ioctl_eventenable))
                        ret = _ctl_eventenable(arg);
                break;
        case MPT2EVENTREPORT:
                ret = _ctl_eventreport(arg);
                break;
        case MPT2HARDRESET:
                if (_IOC_SIZE(cmd) == sizeof(struct mpt2_ioctl_diag_reset))
                        ret = _ctl_do_reset(arg);
                break;
        case MPT2BTDHMAPPING:
                if (_IOC_SIZE(cmd) == sizeof(struct mpt2_ioctl_btdh_mapping))
                        ret = _ctl_btdh_mapping(arg);
                break;
        case MPT2DIAGREGISTER:
                if (_IOC_SIZE(cmd) == sizeof(struct mpt2_diag_register))
                        ret = _ctl_diag_register(arg, state);
                break;
        case MPT2DIAGUNREGISTER:
                if (_IOC_SIZE(cmd) == sizeof(struct mpt2_diag_unregister))
                        ret = _ctl_diag_unregister(arg);
                break;
        case MPT2DIAGQUERY:
                if (_IOC_SIZE(cmd) == sizeof(struct mpt2_diag_query))
                        ret = _ctl_diag_query(arg);
                break;
        case MPT2DIAGRELEASE:
                if (_IOC_SIZE(cmd) == sizeof(struct mpt2_diag_release))
                        ret = _ctl_diag_release(arg, state);
                break;
        case MPT2DIAGREADBUFFER:
                if (_IOC_SIZE(cmd) == sizeof(struct mpt2_diag_read_buffer))
                        ret = _ctl_diag_read_buffer(arg, state);
                break;
        default:
        {
                struct mpt2_ioctl_command karg;
                struct MPT2SAS_ADAPTER *ioc;

                if (copy_from_user(&karg, arg, sizeof(karg))) {
                        printk(KERN_ERR "failure at %s:%d/%s()!\n",
                            __FILE__, __LINE__, __func__);
                        return -EFAULT;
                }

                if (_ctl_verify_adapter(karg.hdr.ioc_number, &ioc) == -1 ||
                    !ioc)
                        return -ENODEV;

                dctlprintk(ioc, printk(MPT2SAS_DEBUG_FMT
                    "unsupported ioctl opcode(0x%08x)\n", ioc->name, cmd));
                break;
        }
        }
        return ret;
}

/**
 * _ctl_ioctl - main ioctl entry point (unlocked)
 * @file - (struct file)
 * @cmd - ioctl opcode
 * @arg -
 */
static long
_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
        long ret;

        lock_kernel();
        ret = _ctl_ioctl_main(file, cmd, (void __user *)arg);
        unlock_kernel();
        return ret;
}

#ifdef CONFIG_COMPAT
/**
 * _ctl_compat_mpt_command - convert 32bit pointers to 64bit.
 * @file - (struct file)
 * @cmd - ioctl opcode
 * @arg - (struct mpt2_ioctl_command32)
 *
 * MPT2COMMAND32 - Handle 32bit applications running on 64bit os.
 */
static long
_ctl_compat_mpt_command(struct file *file, unsigned cmd, unsigned long arg)
{
        struct mpt2_ioctl_command32 karg32;
        struct mpt2_ioctl_command32 __user *uarg;
        struct mpt2_ioctl_command karg;
        struct MPT2SAS_ADAPTER *ioc;
        enum block_state state;

        if (_IOC_SIZE(cmd) != sizeof(struct mpt2_ioctl_command32))
                return -EINVAL;

        uarg = (struct mpt2_ioctl_command32 __user *) arg;

        if (copy_from_user(&karg32, (char __user *)arg, sizeof(karg32))) {
                printk(KERN_ERR "failure at %s:%d/%s()!\n",
                    __FILE__, __LINE__, __func__);
                return -EFAULT;
        }
        if (_ctl_verify_adapter(karg32.hdr.ioc_number, &ioc) == -1 || !ioc)
                return -ENODEV;

        if (ioc->shost_recovery)
                return -EAGAIN;

        memset(&karg, 0, sizeof(struct mpt2_ioctl_command));
        karg.hdr.ioc_number = karg32.hdr.ioc_number;
        karg.hdr.port_number = karg32.hdr.port_number;
        karg.hdr.max_data_size = karg32.hdr.max_data_size;
        karg.timeout = karg32.timeout;
        karg.max_reply_bytes = karg32.max_reply_bytes;
        karg.data_in_size = karg32.data_in_size;
        karg.data_out_size = karg32.data_out_size;
        karg.max_sense_bytes = karg32.max_sense_bytes;
        karg.data_sge_offset = karg32.data_sge_offset;
        memcpy(&karg.reply_frame_buf_ptr, &karg32.reply_frame_buf_ptr,
            sizeof(uint32_t));
        memcpy(&karg.data_in_buf_ptr, &karg32.data_in_buf_ptr,
            sizeof(uint32_t));
        memcpy(&karg.data_out_buf_ptr, &karg32.data_out_buf_ptr,
            sizeof(uint32_t));
        memcpy(&karg.sense_data_ptr, &karg32.sense_data_ptr,
            sizeof(uint32_t));
        state = (file->f_flags & O_NONBLOCK) ? NON_BLOCKING : BLOCKING;
        return _ctl_do_mpt_command(ioc, karg, &uarg->mf, state);
}

/**
 * _ctl_ioctl_compat - main ioctl entry point (compat)
 * @file -
 * @cmd -
 * @arg -
 *
 * This routine handles 32 bit applications in 64bit os.
 */
static long
_ctl_ioctl_compat(struct file *file, unsigned cmd, unsigned long arg)
{
        long ret;

        lock_kernel();
        if (cmd == MPT2COMMAND32)
                ret = _ctl_compat_mpt_command(file, cmd, arg);
        else
                ret = _ctl_ioctl_main(file, cmd, (void __user *)arg);
        unlock_kernel();
        return ret;
}
#endif

/* scsi host attributes */

/**
 * _ctl_version_fw_show - firmware version
 * @cdev - pointer to embedded class device
 * @buf - the buffer returned
 *
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t
_ctl_version_fw_show(struct device *cdev, struct device_attribute *attr,
    char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);

        return snprintf(buf, PAGE_SIZE, "%02d.%02d.%02d.%02d\n",
            (ioc->facts.FWVersion.Word & 0xFF000000) >> 24,
            (ioc->facts.FWVersion.Word & 0x00FF0000) >> 16,
            (ioc->facts.FWVersion.Word & 0x0000FF00) >> 8,
            ioc->facts.FWVersion.Word & 0x000000FF);
}
static DEVICE_ATTR(version_fw, S_IRUGO, _ctl_version_fw_show, NULL);

/**
 * _ctl_version_bios_show - bios version
 * @cdev - pointer to embedded class device
 * @buf - the buffer returned
 *
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t
_ctl_version_bios_show(struct device *cdev, struct device_attribute *attr,
    char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);

        u32 version = le32_to_cpu(ioc->bios_pg3.BiosVersion);

        return snprintf(buf, PAGE_SIZE, "%02d.%02d.%02d.%02d\n",
            (version & 0xFF000000) >> 24,
            (version & 0x00FF0000) >> 16,
            (version & 0x0000FF00) >> 8,
            version & 0x000000FF);
}
static DEVICE_ATTR(version_bios, S_IRUGO, _ctl_version_bios_show, NULL);

/**
 * _ctl_version_mpi_show - MPI (message passing interface) version
 * @cdev - pointer to embedded class device
 * @buf - the buffer returned
 *
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t
_ctl_version_mpi_show(struct device *cdev, struct device_attribute *attr,
    char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);

        return snprintf(buf, PAGE_SIZE, "%03x.%02x\n",
            ioc->facts.MsgVersion, ioc->facts.HeaderVersion >> 8);
}
static DEVICE_ATTR(version_mpi, S_IRUGO, _ctl_version_mpi_show, NULL);

/**
 * _ctl_version_product_show - product name
 * @cdev - pointer to embedded class device
 * @buf - the buffer returned
 *
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t
_ctl_version_product_show(struct device *cdev, struct device_attribute *attr,
    char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);

        return snprintf(buf, 16, "%s\n", ioc->manu_pg0.ChipName);
}
static DEVICE_ATTR(version_product, S_IRUGO,
   _ctl_version_product_show, NULL);

/**
 * _ctl_version_nvdata_persistent_show - ndvata persistent version
 * @cdev - pointer to embedded class device
 * @buf - the buffer returned
 *
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t
_ctl_version_nvdata_persistent_show(struct device *cdev,
    struct device_attribute *attr, char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);

        return snprintf(buf, PAGE_SIZE, "%02xh\n",
            le16_to_cpu(ioc->iounit_pg0.NvdataVersionPersistent.Word));
}
static DEVICE_ATTR(version_nvdata_persistent, S_IRUGO,
    _ctl_version_nvdata_persistent_show, NULL);

/**
 * _ctl_version_nvdata_default_show - nvdata default version
 * @cdev - pointer to embedded class device
 * @buf - the buffer returned
 *
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t
_ctl_version_nvdata_default_show(struct device *cdev,
    struct device_attribute *attr, char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);

        return snprintf(buf, PAGE_SIZE, "%02xh\n",
            le16_to_cpu(ioc->iounit_pg0.NvdataVersionDefault.Word));
}
static DEVICE_ATTR(version_nvdata_default, S_IRUGO,
    _ctl_version_nvdata_default_show, NULL);

/**
 * _ctl_board_name_show - board name
 * @cdev - pointer to embedded class device
 * @buf - the buffer returned
 *
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t
_ctl_board_name_show(struct device *cdev, struct device_attribute *attr,
    char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);

        return snprintf(buf, 16, "%s\n", ioc->manu_pg0.BoardName);
}
static DEVICE_ATTR(board_name, S_IRUGO, _ctl_board_name_show, NULL);

/**
 * _ctl_board_assembly_show - board assembly name
 * @cdev - pointer to embedded class device
 * @buf - the buffer returned
 *
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t
_ctl_board_assembly_show(struct device *cdev, struct device_attribute *attr,
    char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);

        return snprintf(buf, 16, "%s\n", ioc->manu_pg0.BoardAssembly);
}
static DEVICE_ATTR(board_assembly, S_IRUGO,
    _ctl_board_assembly_show, NULL);

/**
 * _ctl_board_tracer_show - board tracer number
 * @cdev - pointer to embedded class device
 * @buf - the buffer returned
 *
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t
_ctl_board_tracer_show(struct device *cdev, struct device_attribute *attr,
    char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);

        return snprintf(buf, 16, "%s\n", ioc->manu_pg0.BoardTracerNumber);
}
static DEVICE_ATTR(board_tracer, S_IRUGO,
    _ctl_board_tracer_show, NULL);

/**
 * _ctl_io_delay_show - io missing delay
 * @cdev - pointer to embedded class device
 * @buf - the buffer returned
 *
 * This is for firmware implemention for deboucing device
 * removal events.
 *
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t
_ctl_io_delay_show(struct device *cdev, struct device_attribute *attr,
    char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);

        return snprintf(buf, PAGE_SIZE, "%02d\n", ioc->io_missing_delay);
}
static DEVICE_ATTR(io_delay, S_IRUGO,
    _ctl_io_delay_show, NULL);

/**
 * _ctl_device_delay_show - device missing delay
 * @cdev - pointer to embedded class device
 * @buf - the buffer returned
 *
 * This is for firmware implemention for deboucing device
 * removal events.
 *
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t
_ctl_device_delay_show(struct device *cdev, struct device_attribute *attr,
    char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);

        return snprintf(buf, PAGE_SIZE, "%02d\n", ioc->device_missing_delay);
}
static DEVICE_ATTR(device_delay, S_IRUGO,
    _ctl_device_delay_show, NULL);

/**
 * _ctl_fw_queue_depth_show - global credits
 * @cdev - pointer to embedded class device
 * @buf - the buffer returned
 *
 * This is firmware queue depth limit
 *
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t
_ctl_fw_queue_depth_show(struct device *cdev, struct device_attribute *attr,
    char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);

        return snprintf(buf, PAGE_SIZE, "%02d\n", ioc->facts.RequestCredit);
}
static DEVICE_ATTR(fw_queue_depth, S_IRUGO,
    _ctl_fw_queue_depth_show, NULL);

/**
 * _ctl_sas_address_show - sas address
 * @cdev - pointer to embedded class device
 * @buf - the buffer returned
 *
 * This is the controller sas address
 *
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t
_ctl_host_sas_address_show(struct device *cdev, struct device_attribute *attr,
    char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);

        return snprintf(buf, PAGE_SIZE, "0x%016llx\n",
            (unsigned long long)ioc->sas_hba.sas_address);
}
static DEVICE_ATTR(host_sas_address, S_IRUGO,
    _ctl_host_sas_address_show, NULL);

/**
 * _ctl_logging_level_show - logging level
 * @cdev - pointer to embedded class device
 * @buf - the buffer returned
 *
 * A sysfs 'read/write' shost attribute.
 */
static ssize_t
_ctl_logging_level_show(struct device *cdev, struct device_attribute *attr,
    char *buf)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);

        return snprintf(buf, PAGE_SIZE, "%08xh\n", ioc->logging_level);
}
static ssize_t
_ctl_logging_level_store(struct device *cdev, struct device_attribute *attr,
    const char *buf, size_t count)
{
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);
        int val = 0;

        if (sscanf(buf, "%x", &val) != 1)
                return -EINVAL;

        ioc->logging_level = val;
        printk(MPT2SAS_INFO_FMT "logging_level=%08xh\n", ioc->name,
            ioc->logging_level);
        return strlen(buf);
}
static DEVICE_ATTR(logging_level, S_IRUGO | S_IWUSR,
    _ctl_logging_level_show, _ctl_logging_level_store);

struct device_attribute *mpt2sas_host_attrs[] = {
        &dev_attr_version_fw,
        &dev_attr_version_bios,
        &dev_attr_version_mpi,
        &dev_attr_version_product,
        &dev_attr_version_nvdata_persistent,
        &dev_attr_version_nvdata_default,
        &dev_attr_board_name,
        &dev_attr_board_assembly,
        &dev_attr_board_tracer,
        &dev_attr_io_delay,
        &dev_attr_device_delay,
        &dev_attr_logging_level,
        &dev_attr_fw_queue_depth,
        &dev_attr_host_sas_address,
        NULL,
};

/* device attributes */

/**
 * _ctl_device_sas_address_show - sas address
 * @cdev - pointer to embedded class device
 * @buf - the buffer returned
 *
 * This is the sas address for the target
 *
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t
_ctl_device_sas_address_show(struct device *dev, struct device_attribute *attr,
    char *buf)
{
        struct scsi_device *sdev = to_scsi_device(dev);
        struct MPT2SAS_DEVICE *sas_device_priv_data = sdev->hostdata;

        return snprintf(buf, PAGE_SIZE, "0x%016llx\n",
            (unsigned long long)sas_device_priv_data->sas_target->sas_address);
}
static DEVICE_ATTR(sas_address, S_IRUGO, _ctl_device_sas_address_show, NULL);

/**
 * _ctl_device_handle_show - device handle
 * @cdev - pointer to embedded class device
 * @buf - the buffer returned
 *
 * This is the firmware assigned device handle
 *
 * A sysfs 'read-only' shost attribute.
 */
static ssize_t
_ctl_device_handle_show(struct device *dev, struct device_attribute *attr,
    char *buf)
{
        struct scsi_device *sdev = to_scsi_device(dev);
        struct MPT2SAS_DEVICE *sas_device_priv_data = sdev->hostdata;

        return snprintf(buf, PAGE_SIZE, "0x%04x\n",
            sas_device_priv_data->sas_target->handle);
}
static DEVICE_ATTR(sas_device_handle, S_IRUGO, _ctl_device_handle_show, NULL);

struct device_attribute *mpt2sas_dev_attrs[] = {
        &dev_attr_sas_address,
        &dev_attr_sas_device_handle,
        NULL,
};

static const struct file_operations ctl_fops = {
        .owner = THIS_MODULE,
        .unlocked_ioctl = _ctl_ioctl,
        .release = _ctl_release,
        .poll = _ctl_poll,
        .fasync = _ctl_fasync,
#ifdef CONFIG_COMPAT
        .compat_ioctl = _ctl_ioctl_compat,
#endif
};

static struct miscdevice ctl_dev = {
        .minor  = MPT2SAS_MINOR,
        .name   = MPT2SAS_DEV_NAME,
        .fops   = &ctl_fops,
};

/**
 * mpt2sas_ctl_init - main entry point for ctl.
 *
 */
void
mpt2sas_ctl_init(void)
{
        async_queue = NULL;
        if (misc_register(&ctl_dev) < 0)
                printk(KERN_ERR "%s can't register misc device [minor=%d]\n",
                    MPT2SAS_DRIVER_NAME, MPT2SAS_MINOR);

        init_waitqueue_head(&ctl_poll_wait);
}

/**
 * mpt2sas_ctl_exit - exit point for ctl
 *
 */
void
mpt2sas_ctl_exit(void)
{
        struct MPT2SAS_ADAPTER *ioc;
        int i;

        list_for_each_entry(ioc, &mpt2sas_ioc_list, list) {

                /* free memory associated to diag buffers */
                for (i = 0; i < MPI2_DIAG_BUF_TYPE_COUNT; i++) {
                        if (!ioc->diag_buffer[i])
                                continue;
                        pci_free_consistent(ioc->pdev, ioc->diag_buffer_sz[i],
                            ioc->diag_buffer[i], ioc->diag_buffer_dma[i]);
                        ioc->diag_buffer[i] = NULL;
                        ioc->diag_buffer_status[i] = 0;
                }

                kfree(ioc->event_log);
        }
        misc_deregister(&ctl_dev);
}