/*
 * SAS Transport Layer for MPT (Message Passing Technology) based controllers
 *
 * This code is based on drivers/scsi/mpt3sas/mpt3sas_transport.c
 * Copyright (C) 2012-2013  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/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/workqueue.h>
#include <linux/delay.h>
#include <linux/pci.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport_sas.h>
#include <scsi/scsi_dbg.h>

#include "mpt3sas_base.h"

/**
 * _transport_sas_node_find_by_sas_address - sas node search
 * @ioc: per adapter object
 * @sas_address: sas address of expander or sas host
 * Context: Calling function should acquire ioc->sas_node_lock.
 *
 * Search for either hba phys or expander device based on handle, then returns
 * the sas_node object.
 */
static struct _sas_node *
_transport_sas_node_find_by_sas_address(struct MPT3SAS_ADAPTER *ioc,
        u64 sas_address)
{
        if (ioc->sas_hba.sas_address == sas_address)
                return &ioc->sas_hba;
        else
                return mpt3sas_scsih_expander_find_by_sas_address(ioc,
                    sas_address);
}

/**
 * _transport_convert_phy_link_rate -
 * @link_rate: link rate returned from mpt firmware
 *
 * Convert link_rate from mpi fusion into sas_transport form.
 */
static enum sas_linkrate
_transport_convert_phy_link_rate(u8 link_rate)
{
        enum sas_linkrate rc;

        switch (link_rate) {
        case MPI2_SAS_NEG_LINK_RATE_1_5:
                rc = SAS_LINK_RATE_1_5_GBPS;
                break;
        case MPI2_SAS_NEG_LINK_RATE_3_0:
                rc = SAS_LINK_RATE_3_0_GBPS;
                break;
        case MPI2_SAS_NEG_LINK_RATE_6_0:
                rc = SAS_LINK_RATE_6_0_GBPS;
                break;
        case MPI25_SAS_NEG_LINK_RATE_12_0:
                rc = SAS_LINK_RATE_12_0_GBPS;
                break;
        case MPI2_SAS_NEG_LINK_RATE_PHY_DISABLED:
                rc = SAS_PHY_DISABLED;
                break;
        case MPI2_SAS_NEG_LINK_RATE_NEGOTIATION_FAILED:
                rc = SAS_LINK_RATE_FAILED;
                break;
        case MPI2_SAS_NEG_LINK_RATE_PORT_SELECTOR:
                rc = SAS_SATA_PORT_SELECTOR;
                break;
        case MPI2_SAS_NEG_LINK_RATE_SMP_RESET_IN_PROGRESS:
                rc = SAS_PHY_RESET_IN_PROGRESS;
                break;

        default:
        case MPI2_SAS_NEG_LINK_RATE_SATA_OOB_COMPLETE:
        case MPI2_SAS_NEG_LINK_RATE_UNKNOWN_LINK_RATE:
                rc = SAS_LINK_RATE_UNKNOWN;
                break;
        }
        return rc;
}

/**
 * _transport_set_identify - set identify for phys and end devices
 * @ioc: per adapter object
 * @handle: device handle
 * @identify: sas identify info
 *
 * Populates sas identify info.
 *
 * Returns 0 for success, non-zero for failure.
 */
static int
_transport_set_identify(struct MPT3SAS_ADAPTER *ioc, u16 handle,
        struct sas_identify *identify)
{
        Mpi2SasDevicePage0_t sas_device_pg0;
        Mpi2ConfigReply_t mpi_reply;
        u32 device_info;
        u32 ioc_status;

        if (ioc->shost_recovery || ioc->pci_error_recovery) {
                pr_info(MPT3SAS_FMT "%s: host reset in progress!\n",
                    __func__, ioc->name);
                return -EFAULT;
        }

        if ((mpt3sas_config_get_sas_device_pg0(ioc, &mpi_reply, &sas_device_pg0,
            MPI2_SAS_DEVICE_PGAD_FORM_HANDLE, handle))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return -ENXIO;
        }

        ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
            MPI2_IOCSTATUS_MASK;
        if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                pr_err(MPT3SAS_FMT
                        "handle(0x%04x), ioc_status(0x%04x)\nfailure at %s:%d/%s()!\n",
                        ioc->name, handle, ioc_status,
                     __FILE__, __LINE__, __func__);
                return -EIO;
        }

        memset(identify, 0, sizeof(struct sas_identify));
        device_info = le32_to_cpu(sas_device_pg0.DeviceInfo);

        /* sas_address */
        identify->sas_address = le64_to_cpu(sas_device_pg0.SASAddress);

        /* phy number of the parent device this device is linked to */
        identify->phy_identifier = sas_device_pg0.PhyNum;

        /* device_type */
        switch (device_info & MPI2_SAS_DEVICE_INFO_MASK_DEVICE_TYPE) {
        case MPI2_SAS_DEVICE_INFO_NO_DEVICE:
                identify->device_type = SAS_PHY_UNUSED;
                break;
        case MPI2_SAS_DEVICE_INFO_END_DEVICE:
                identify->device_type = SAS_END_DEVICE;
                break;
        case MPI2_SAS_DEVICE_INFO_EDGE_EXPANDER:
                identify->device_type = SAS_EDGE_EXPANDER_DEVICE;
                break;
        case MPI2_SAS_DEVICE_INFO_FANOUT_EXPANDER:
                identify->device_type = SAS_FANOUT_EXPANDER_DEVICE;
                break;
        }

        /* initiator_port_protocols */
        if (device_info & MPI2_SAS_DEVICE_INFO_SSP_INITIATOR)
                identify->initiator_port_protocols |= SAS_PROTOCOL_SSP;
        if (device_info & MPI2_SAS_DEVICE_INFO_STP_INITIATOR)
                identify->initiator_port_protocols |= SAS_PROTOCOL_STP;
        if (device_info & MPI2_SAS_DEVICE_INFO_SMP_INITIATOR)
                identify->initiator_port_protocols |= SAS_PROTOCOL_SMP;
        if (device_info & MPI2_SAS_DEVICE_INFO_SATA_HOST)
                identify->initiator_port_protocols |= SAS_PROTOCOL_SATA;

        /* target_port_protocols */
        if (device_info & MPI2_SAS_DEVICE_INFO_SSP_TARGET)
                identify->target_port_protocols |= SAS_PROTOCOL_SSP;
        if (device_info & MPI2_SAS_DEVICE_INFO_STP_TARGET)
                identify->target_port_protocols |= SAS_PROTOCOL_STP;
        if (device_info & MPI2_SAS_DEVICE_INFO_SMP_TARGET)
                identify->target_port_protocols |= SAS_PROTOCOL_SMP;
        if (device_info & MPI2_SAS_DEVICE_INFO_SATA_DEVICE)
                identify->target_port_protocols |= SAS_PROTOCOL_SATA;

        return 0;
}

/**
 * mpt3sas_transport_done -  internal transport layer callback handler.
 * @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)
 *
 * Callback handler when sending internal generated transport cmds.
 * The callback index passed is `ioc->transport_cb_idx`
 *
 * Return 1 meaning mf should be freed from _base_interrupt
 *        0 means the mf is freed from this function.
 */
u8
mpt3sas_transport_done(struct MPT3SAS_ADAPTER *ioc, u16 smid, u8 msix_index,
        u32 reply)
{
        MPI2DefaultReply_t *mpi_reply;

        mpi_reply =  mpt3sas_base_get_reply_virt_addr(ioc, reply);
        if (ioc->transport_cmds.status == MPT3_CMD_NOT_USED)
                return 1;
        if (ioc->transport_cmds.smid != smid)
                return 1;
        ioc->transport_cmds.status |= MPT3_CMD_COMPLETE;
        if (mpi_reply) {
                memcpy(ioc->transport_cmds.reply, mpi_reply,
                    mpi_reply->MsgLength*4);
                ioc->transport_cmds.status |= MPT3_CMD_REPLY_VALID;
        }
        ioc->transport_cmds.status &= ~MPT3_CMD_PENDING;
        complete(&ioc->transport_cmds.done);
        return 1;
}

/* report manufacture request structure */
struct rep_manu_request {
        u8 smp_frame_type;
        u8 function;
        u8 reserved;
        u8 request_length;
};

/* report manufacture reply structure */
struct rep_manu_reply {
        u8 smp_frame_type; /* 0x41 */
        u8 function; /* 0x01 */
        u8 function_result;
        u8 response_length;
        u16 expander_change_count;
        u8 reserved0[2];
        u8 sas_format;
        u8 reserved2[3];
        u8 vendor_id[SAS_EXPANDER_VENDOR_ID_LEN];
        u8 product_id[SAS_EXPANDER_PRODUCT_ID_LEN];
        u8 product_rev[SAS_EXPANDER_PRODUCT_REV_LEN];
        u8 component_vendor_id[SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN];
        u16 component_id;
        u8 component_revision_id;
        u8 reserved3;
        u8 vendor_specific[8];
};

/**
 * transport_expander_report_manufacture - obtain SMP report_manufacture
 * @ioc: per adapter object
 * @sas_address: expander sas address
 * @edev: the sas_expander_device object
 *
 * Fills in the sas_expander_device object when SMP port is created.
 *
 * Returns 0 for success, non-zero for failure.
 */
static int
_transport_expander_report_manufacture(struct MPT3SAS_ADAPTER *ioc,
        u64 sas_address, struct sas_expander_device *edev)
{
        Mpi2SmpPassthroughRequest_t *mpi_request;
        Mpi2SmpPassthroughReply_t *mpi_reply;
        struct rep_manu_reply *manufacture_reply;
        struct rep_manu_request *manufacture_request;
        int rc;
        u16 smid;
        u32 ioc_state;
        unsigned long timeleft;
        void *psge;
        u8 issue_reset = 0;
        void *data_out = NULL;
        dma_addr_t data_out_dma;
        dma_addr_t data_in_dma;
        size_t data_in_sz;
        size_t data_out_sz;
        u16 wait_state_count;

        if (ioc->shost_recovery || ioc->pci_error_recovery) {
                pr_info(MPT3SAS_FMT "%s: host reset in progress!\n",
                    __func__, ioc->name);
                return -EFAULT;
        }

        mutex_lock(&ioc->transport_cmds.mutex);

        if (ioc->transport_cmds.status != MPT3_CMD_NOT_USED) {
                pr_err(MPT3SAS_FMT "%s: transport_cmds in use\n",
                    ioc->name, __func__);
                rc = -EAGAIN;
                goto out;
        }
        ioc->transport_cmds.status = MPT3_CMD_PENDING;

        wait_state_count = 0;
        ioc_state = mpt3sas_base_get_iocstate(ioc, 1);
        while (ioc_state != MPI2_IOC_STATE_OPERATIONAL) {
                if (wait_state_count++ == 10) {
                        pr_err(MPT3SAS_FMT
                            "%s: failed due to ioc not operational\n",
                            ioc->name, __func__);
                        rc = -EFAULT;
                        goto out;
                }
                ssleep(1);
                ioc_state = mpt3sas_base_get_iocstate(ioc, 1);
                pr_info(MPT3SAS_FMT
                        "%s: waiting for operational state(count=%d)\n",
                        ioc->name, __func__, wait_state_count);
        }
        if (wait_state_count)
                pr_info(MPT3SAS_FMT "%s: ioc is operational\n",
                    ioc->name, __func__);

        smid = mpt3sas_base_get_smid(ioc, ioc->transport_cb_idx);
        if (!smid) {
                pr_err(MPT3SAS_FMT "%s: failed obtaining a smid\n",
                    ioc->name, __func__);
                rc = -EAGAIN;
                goto out;
        }

        rc = 0;
        mpi_request = mpt3sas_base_get_msg_frame(ioc, smid);
        ioc->transport_cmds.smid = smid;

        data_out_sz = sizeof(struct rep_manu_request);
        data_in_sz = sizeof(struct rep_manu_reply);
        data_out = pci_alloc_consistent(ioc->pdev, data_out_sz + data_in_sz,
            &data_out_dma);

        if (!data_out) {
                pr_err("failure at %s:%d/%s()!\n", __FILE__,
                    __LINE__, __func__);
                rc = -ENOMEM;
                mpt3sas_base_free_smid(ioc, smid);
                goto out;
        }

        data_in_dma = data_out_dma + sizeof(struct rep_manu_request);

        manufacture_request = data_out;
        manufacture_request->smp_frame_type = 0x40;
        manufacture_request->function = 1;
        manufacture_request->reserved = 0;
        manufacture_request->request_length = 0;

        memset(mpi_request, 0, sizeof(Mpi2SmpPassthroughRequest_t));
        mpi_request->Function = MPI2_FUNCTION_SMP_PASSTHROUGH;
        mpi_request->PhysicalPort = 0xFF;
        mpi_request->SASAddress = cpu_to_le64(sas_address);
        mpi_request->RequestDataLength = cpu_to_le16(data_out_sz);
        psge = &mpi_request->SGL;

        ioc->build_sg(ioc, psge, data_out_dma, data_out_sz, data_in_dma,
            data_in_sz);

        dtransportprintk(ioc, pr_info(MPT3SAS_FMT
                "report_manufacture - send to sas_addr(0x%016llx)\n",
                ioc->name, (unsigned long long)sas_address));
        init_completion(&ioc->transport_cmds.done);
        mpt3sas_base_put_smid_default(ioc, smid);
        timeleft = wait_for_completion_timeout(&ioc->transport_cmds.done,
            10*HZ);

        if (!(ioc->transport_cmds.status & MPT3_CMD_COMPLETE)) {
                pr_err(MPT3SAS_FMT "%s: timeout\n",
                    ioc->name, __func__);
                _debug_dump_mf(mpi_request,
                    sizeof(Mpi2SmpPassthroughRequest_t)/4);
                if (!(ioc->transport_cmds.status & MPT3_CMD_RESET))
                        issue_reset = 1;
                goto issue_host_reset;
        }

        dtransportprintk(ioc, pr_info(MPT3SAS_FMT
                "report_manufacture - complete\n", ioc->name));

        if (ioc->transport_cmds.status & MPT3_CMD_REPLY_VALID) {
                u8 *tmp;

                mpi_reply = ioc->transport_cmds.reply;

                dtransportprintk(ioc, pr_info(MPT3SAS_FMT
                    "report_manufacture - reply data transfer size(%d)\n",
                    ioc->name, le16_to_cpu(mpi_reply->ResponseDataLength)));

                if (le16_to_cpu(mpi_reply->ResponseDataLength) !=
                    sizeof(struct rep_manu_reply))
                        goto out;

                manufacture_reply = data_out + sizeof(struct rep_manu_request);
                strncpy(edev->vendor_id, manufacture_reply->vendor_id,
                     SAS_EXPANDER_VENDOR_ID_LEN);
                strncpy(edev->product_id, manufacture_reply->product_id,
                     SAS_EXPANDER_PRODUCT_ID_LEN);
                strncpy(edev->product_rev, manufacture_reply->product_rev,
                     SAS_EXPANDER_PRODUCT_REV_LEN);
                edev->level = manufacture_reply->sas_format & 1;
                if (edev->level) {
                        strncpy(edev->component_vendor_id,
                            manufacture_reply->component_vendor_id,
                             SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN);
                        tmp = (u8 *)&manufacture_reply->component_id;
                        edev->component_id = tmp[0] << 8 | tmp[1];
                        edev->component_revision_id =
                            manufacture_reply->component_revision_id;
                }
        } else
                dtransportprintk(ioc, pr_info(MPT3SAS_FMT
                    "report_manufacture - no reply\n", ioc->name));

 issue_host_reset:
        if (issue_reset)
                mpt3sas_base_hard_reset_handler(ioc, CAN_SLEEP,
                    FORCE_BIG_HAMMER);
 out:
        ioc->transport_cmds.status = MPT3_CMD_NOT_USED;
        if (data_out)
                pci_free_consistent(ioc->pdev, data_out_sz + data_in_sz,
                    data_out, data_out_dma);

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


/**
 * _transport_delete_port - helper function to removing a port
 * @ioc: per adapter object
 * @mpt3sas_port: mpt3sas per port object
 *
 * Returns nothing.
 */
static void
_transport_delete_port(struct MPT3SAS_ADAPTER *ioc,
        struct _sas_port *mpt3sas_port)
{
        u64 sas_address = mpt3sas_port->remote_identify.sas_address;
        enum sas_device_type device_type =
            mpt3sas_port->remote_identify.device_type;

        dev_printk(KERN_INFO, &mpt3sas_port->port->dev,
            "remove: sas_addr(0x%016llx)\n",
            (unsigned long long) sas_address);

        ioc->logging_level |= MPT_DEBUG_TRANSPORT;
        if (device_type == SAS_END_DEVICE)
                mpt3sas_device_remove_by_sas_address(ioc, sas_address);
        else if (device_type == SAS_EDGE_EXPANDER_DEVICE ||
            device_type == SAS_FANOUT_EXPANDER_DEVICE)
                mpt3sas_expander_remove(ioc, sas_address);
        ioc->logging_level &= ~MPT_DEBUG_TRANSPORT;
}

/**
 * _transport_delete_phy - helper function to removing single phy from port
 * @ioc: per adapter object
 * @mpt3sas_port: mpt3sas per port object
 * @mpt3sas_phy: mpt3sas per phy object
 *
 * Returns nothing.
 */
static void
_transport_delete_phy(struct MPT3SAS_ADAPTER *ioc,
        struct _sas_port *mpt3sas_port, struct _sas_phy *mpt3sas_phy)
{
        u64 sas_address = mpt3sas_port->remote_identify.sas_address;

        dev_printk(KERN_INFO, &mpt3sas_phy->phy->dev,
            "remove: sas_addr(0x%016llx), phy(%d)\n",
            (unsigned long long) sas_address, mpt3sas_phy->phy_id);

        list_del(&mpt3sas_phy->port_siblings);
        mpt3sas_port->num_phys--;
        sas_port_delete_phy(mpt3sas_port->port, mpt3sas_phy->phy);
        mpt3sas_phy->phy_belongs_to_port = 0;
}

/**
 * _transport_add_phy - helper function to adding single phy to port
 * @ioc: per adapter object
 * @mpt3sas_port: mpt3sas per port object
 * @mpt3sas_phy: mpt3sas per phy object
 *
 * Returns nothing.
 */
static void
_transport_add_phy(struct MPT3SAS_ADAPTER *ioc, struct _sas_port *mpt3sas_port,
        struct _sas_phy *mpt3sas_phy)
{
        u64 sas_address = mpt3sas_port->remote_identify.sas_address;

        dev_printk(KERN_INFO, &mpt3sas_phy->phy->dev,
            "add: sas_addr(0x%016llx), phy(%d)\n", (unsigned long long)
            sas_address, mpt3sas_phy->phy_id);

        list_add_tail(&mpt3sas_phy->port_siblings, &mpt3sas_port->phy_list);
        mpt3sas_port->num_phys++;
        sas_port_add_phy(mpt3sas_port->port, mpt3sas_phy->phy);
        mpt3sas_phy->phy_belongs_to_port = 1;
}

/**
 * _transport_add_phy_to_an_existing_port - adding new phy to existing port
 * @ioc: per adapter object
 * @sas_node: sas node object (either expander or sas host)
 * @mpt3sas_phy: mpt3sas per phy object
 * @sas_address: sas address of device/expander were phy needs to be added to
 *
 * Returns nothing.
 */
static void
_transport_add_phy_to_an_existing_port(struct MPT3SAS_ADAPTER *ioc,
        struct _sas_node *sas_node, struct _sas_phy *mpt3sas_phy,
        u64 sas_address)
{
        struct _sas_port *mpt3sas_port;
        struct _sas_phy *phy_srch;

        if (mpt3sas_phy->phy_belongs_to_port == 1)
                return;

        list_for_each_entry(mpt3sas_port, &sas_node->sas_port_list,
            port_list) {
                if (mpt3sas_port->remote_identify.sas_address !=
                    sas_address)
                        continue;
                list_for_each_entry(phy_srch, &mpt3sas_port->phy_list,
                    port_siblings) {
                        if (phy_srch == mpt3sas_phy)
                                return;
                }
                _transport_add_phy(ioc, mpt3sas_port, mpt3sas_phy);
                        return;
        }

}

/**
 * _transport_del_phy_from_an_existing_port - delete phy from existing port
 * @ioc: per adapter object
 * @sas_node: sas node object (either expander or sas host)
 * @mpt3sas_phy: mpt3sas per phy object
 *
 * Returns nothing.
 */
static void
_transport_del_phy_from_an_existing_port(struct MPT3SAS_ADAPTER *ioc,
        struct _sas_node *sas_node, struct _sas_phy *mpt3sas_phy)
{
        struct _sas_port *mpt3sas_port, *next;
        struct _sas_phy *phy_srch;

        if (mpt3sas_phy->phy_belongs_to_port == 0)
                return;

        list_for_each_entry_safe(mpt3sas_port, next, &sas_node->sas_port_list,
            port_list) {
                list_for_each_entry(phy_srch, &mpt3sas_port->phy_list,
                    port_siblings) {
                        if (phy_srch != mpt3sas_phy)
                                continue;

                        if (mpt3sas_port->num_phys == 1)
                                _transport_delete_port(ioc, mpt3sas_port);
                        else
                                _transport_delete_phy(ioc, mpt3sas_port,
                                    mpt3sas_phy);
                        return;
                }
        }
}

/**
 * _transport_sanity_check - sanity check when adding a new port
 * @ioc: per adapter object
 * @sas_node: sas node object (either expander or sas host)
 * @sas_address: sas address of device being added
 *
 * See the explanation above from _transport_delete_duplicate_port
 */
static void
_transport_sanity_check(struct MPT3SAS_ADAPTER *ioc, struct _sas_node *sas_node,
        u64 sas_address)
{
        int i;

        for (i = 0; i < sas_node->num_phys; i++) {
                if (sas_node->phy[i].remote_identify.sas_address != sas_address)
                        continue;
                if (sas_node->phy[i].phy_belongs_to_port == 1)
                        _transport_del_phy_from_an_existing_port(ioc, sas_node,
                            &sas_node->phy[i]);
        }
}

/**
 * mpt3sas_transport_port_add - insert port to the list
 * @ioc: per adapter object
 * @handle: handle of attached device
 * @sas_address: sas address of parent expander or sas host
 * Context: This function will acquire ioc->sas_node_lock.
 *
 * Adding new port object to the sas_node->sas_port_list.
 *
 * Returns mpt3sas_port.
 */
struct _sas_port *
mpt3sas_transport_port_add(struct MPT3SAS_ADAPTER *ioc, u16 handle,
        u64 sas_address)
{
        struct _sas_phy *mpt3sas_phy, *next;
        struct _sas_port *mpt3sas_port;
        unsigned long flags;
        struct _sas_node *sas_node;
        struct sas_rphy *rphy;
        int i;
        struct sas_port *port;

        mpt3sas_port = kzalloc(sizeof(struct _sas_port),
            GFP_KERNEL);
        if (!mpt3sas_port) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return NULL;
        }

        INIT_LIST_HEAD(&mpt3sas_port->port_list);
        INIT_LIST_HEAD(&mpt3sas_port->phy_list);
        spin_lock_irqsave(&ioc->sas_node_lock, flags);
        sas_node = _transport_sas_node_find_by_sas_address(ioc, sas_address);
        spin_unlock_irqrestore(&ioc->sas_node_lock, flags);

        if (!sas_node) {
                pr_err(MPT3SAS_FMT
                        "%s: Could not find parent sas_address(0x%016llx)!\n",
                        ioc->name, __func__, (unsigned long long)sas_address);
                goto out_fail;
        }

        if ((_transport_set_identify(ioc, handle,
            &mpt3sas_port->remote_identify))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                goto out_fail;
        }

        if (mpt3sas_port->remote_identify.device_type == SAS_PHY_UNUSED) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                goto out_fail;
        }

        _transport_sanity_check(ioc, sas_node,
            mpt3sas_port->remote_identify.sas_address);

        for (i = 0; i < sas_node->num_phys; i++) {
                if (sas_node->phy[i].remote_identify.sas_address !=
                    mpt3sas_port->remote_identify.sas_address)
                        continue;
                list_add_tail(&sas_node->phy[i].port_siblings,
                    &mpt3sas_port->phy_list);
                mpt3sas_port->num_phys++;
        }

        if (!mpt3sas_port->num_phys) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                goto out_fail;
        }

        port = sas_port_alloc_num(sas_node->parent_dev);
        if ((sas_port_add(port))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                goto out_fail;
        }

        list_for_each_entry(mpt3sas_phy, &mpt3sas_port->phy_list,
            port_siblings) {
                if ((ioc->logging_level & MPT_DEBUG_TRANSPORT))
                        dev_printk(KERN_INFO, &port->dev,
                                "add: handle(0x%04x), sas_addr(0x%016llx), phy(%d)\n",
                                handle, (unsigned long long)
                            mpt3sas_port->remote_identify.sas_address,
                            mpt3sas_phy->phy_id);
                sas_port_add_phy(port, mpt3sas_phy->phy);
                mpt3sas_phy->phy_belongs_to_port = 1;
        }

        mpt3sas_port->port = port;
        if (mpt3sas_port->remote_identify.device_type == SAS_END_DEVICE)
                rphy = sas_end_device_alloc(port);
        else
                rphy = sas_expander_alloc(port,
                    mpt3sas_port->remote_identify.device_type);

        rphy->identify = mpt3sas_port->remote_identify;
        if ((sas_rphy_add(rphy))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
        }
        if ((ioc->logging_level & MPT_DEBUG_TRANSPORT))
                dev_printk(KERN_INFO, &rphy->dev,
                        "add: handle(0x%04x), sas_addr(0x%016llx)\n",
                        handle, (unsigned long long)
                    mpt3sas_port->remote_identify.sas_address);
        mpt3sas_port->rphy = rphy;
        spin_lock_irqsave(&ioc->sas_node_lock, flags);
        list_add_tail(&mpt3sas_port->port_list, &sas_node->sas_port_list);
        spin_unlock_irqrestore(&ioc->sas_node_lock, flags);

        /* fill in report manufacture */
        if (mpt3sas_port->remote_identify.device_type ==
            MPI2_SAS_DEVICE_INFO_EDGE_EXPANDER ||
            mpt3sas_port->remote_identify.device_type ==
            MPI2_SAS_DEVICE_INFO_FANOUT_EXPANDER)
                _transport_expander_report_manufacture(ioc,
                    mpt3sas_port->remote_identify.sas_address,
                    rphy_to_expander_device(rphy));
        return mpt3sas_port;

 out_fail:
        list_for_each_entry_safe(mpt3sas_phy, next, &mpt3sas_port->phy_list,
            port_siblings)
                list_del(&mpt3sas_phy->port_siblings);
        kfree(mpt3sas_port);
        return NULL;
}

/**
 * mpt3sas_transport_port_remove - remove port from the list
 * @ioc: per adapter object
 * @sas_address: sas address of attached device
 * @sas_address_parent: sas address of parent expander or sas host
 * Context: This function will acquire ioc->sas_node_lock.
 *
 * Removing object and freeing associated memory from the
 * ioc->sas_port_list.
 *
 * Return nothing.
 */
void
mpt3sas_transport_port_remove(struct MPT3SAS_ADAPTER *ioc, u64 sas_address,
        u64 sas_address_parent)
{
        int i;
        unsigned long flags;
        struct _sas_port *mpt3sas_port, *next;
        struct _sas_node *sas_node;
        u8 found = 0;
        struct _sas_phy *mpt3sas_phy, *next_phy;

        spin_lock_irqsave(&ioc->sas_node_lock, flags);
        sas_node = _transport_sas_node_find_by_sas_address(ioc,
            sas_address_parent);
        if (!sas_node) {
                spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
                return;
        }
        list_for_each_entry_safe(mpt3sas_port, next, &sas_node->sas_port_list,
            port_list) {
                if (mpt3sas_port->remote_identify.sas_address != sas_address)
                        continue;
                found = 1;
                list_del(&mpt3sas_port->port_list);
                goto out;
        }
 out:
        if (!found) {
                spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
                return;
        }

        for (i = 0; i < sas_node->num_phys; i++) {
                if (sas_node->phy[i].remote_identify.sas_address == sas_address)
                        memset(&sas_node->phy[i].remote_identify, 0 ,
                            sizeof(struct sas_identify));
        }

        spin_unlock_irqrestore(&ioc->sas_node_lock, flags);

        list_for_each_entry_safe(mpt3sas_phy, next_phy,
            &mpt3sas_port->phy_list, port_siblings) {
                if ((ioc->logging_level & MPT_DEBUG_TRANSPORT))
                        dev_printk(KERN_INFO, &mpt3sas_port->port->dev,
                            "remove: sas_addr(0x%016llx), phy(%d)\n",
                            (unsigned long long)
                            mpt3sas_port->remote_identify.sas_address,
                            mpt3sas_phy->phy_id);
                mpt3sas_phy->phy_belongs_to_port = 0;
                sas_port_delete_phy(mpt3sas_port->port, mpt3sas_phy->phy);
                list_del(&mpt3sas_phy->port_siblings);
        }
        sas_port_delete(mpt3sas_port->port);
        kfree(mpt3sas_port);
}

/**
 * mpt3sas_transport_add_host_phy - report sas_host phy to transport
 * @ioc: per adapter object
 * @mpt3sas_phy: mpt3sas per phy object
 * @phy_pg0: sas phy page 0
 * @parent_dev: parent device class object
 *
 * Returns 0 for success, non-zero for failure.
 */
int
mpt3sas_transport_add_host_phy(struct MPT3SAS_ADAPTER *ioc, struct _sas_phy
        *mpt3sas_phy, Mpi2SasPhyPage0_t phy_pg0, struct device *parent_dev)
{
        struct sas_phy *phy;
        int phy_index = mpt3sas_phy->phy_id;


        INIT_LIST_HEAD(&mpt3sas_phy->port_siblings);
        phy = sas_phy_alloc(parent_dev, phy_index);
        if (!phy) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return -1;
        }
        if ((_transport_set_identify(ioc, mpt3sas_phy->handle,
            &mpt3sas_phy->identify))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                sas_phy_free(phy);
                return -1;
        }
        phy->identify = mpt3sas_phy->identify;
        mpt3sas_phy->attached_handle = le16_to_cpu(phy_pg0.AttachedDevHandle);
        if (mpt3sas_phy->attached_handle)
                _transport_set_identify(ioc, mpt3sas_phy->attached_handle,
                    &mpt3sas_phy->remote_identify);
        phy->identify.phy_identifier = mpt3sas_phy->phy_id;
        phy->negotiated_linkrate = _transport_convert_phy_link_rate(
            phy_pg0.NegotiatedLinkRate & MPI2_SAS_NEG_LINK_RATE_MASK_PHYSICAL);
        phy->minimum_linkrate_hw = _transport_convert_phy_link_rate(
            phy_pg0.HwLinkRate & MPI2_SAS_HWRATE_MIN_RATE_MASK);
        phy->maximum_linkrate_hw = _transport_convert_phy_link_rate(
            phy_pg0.HwLinkRate >> 4);
        phy->minimum_linkrate = _transport_convert_phy_link_rate(
            phy_pg0.ProgrammedLinkRate & MPI2_SAS_PRATE_MIN_RATE_MASK);
        phy->maximum_linkrate = _transport_convert_phy_link_rate(
            phy_pg0.ProgrammedLinkRate >> 4);

        if ((sas_phy_add(phy))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                sas_phy_free(phy);
                return -1;
        }
        if ((ioc->logging_level & MPT_DEBUG_TRANSPORT))
                dev_printk(KERN_INFO, &phy->dev,
                    "add: handle(0x%04x), sas_addr(0x%016llx)\n"
                    "\tattached_handle(0x%04x), sas_addr(0x%016llx)\n",
                    mpt3sas_phy->handle, (unsigned long long)
                    mpt3sas_phy->identify.sas_address,
                    mpt3sas_phy->attached_handle,
                    (unsigned long long)
                    mpt3sas_phy->remote_identify.sas_address);
        mpt3sas_phy->phy = phy;
        return 0;
}


/**
 * mpt3sas_transport_add_expander_phy - report expander phy to transport
 * @ioc: per adapter object
 * @mpt3sas_phy: mpt3sas per phy object
 * @expander_pg1: expander page 1
 * @parent_dev: parent device class object
 *
 * Returns 0 for success, non-zero for failure.
 */
int
mpt3sas_transport_add_expander_phy(struct MPT3SAS_ADAPTER *ioc, struct _sas_phy
        *mpt3sas_phy, Mpi2ExpanderPage1_t expander_pg1,
        struct device *parent_dev)
{
        struct sas_phy *phy;
        int phy_index = mpt3sas_phy->phy_id;

        INIT_LIST_HEAD(&mpt3sas_phy->port_siblings);
        phy = sas_phy_alloc(parent_dev, phy_index);
        if (!phy) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return -1;
        }
        if ((_transport_set_identify(ioc, mpt3sas_phy->handle,
            &mpt3sas_phy->identify))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                sas_phy_free(phy);
                return -1;
        }
        phy->identify = mpt3sas_phy->identify;
        mpt3sas_phy->attached_handle =
            le16_to_cpu(expander_pg1.AttachedDevHandle);
        if (mpt3sas_phy->attached_handle)
                _transport_set_identify(ioc, mpt3sas_phy->attached_handle,
                    &mpt3sas_phy->remote_identify);
        phy->identify.phy_identifier = mpt3sas_phy->phy_id;
        phy->negotiated_linkrate = _transport_convert_phy_link_rate(
            expander_pg1.NegotiatedLinkRate &
            MPI2_SAS_NEG_LINK_RATE_MASK_PHYSICAL);
        phy->minimum_linkrate_hw = _transport_convert_phy_link_rate(
            expander_pg1.HwLinkRate & MPI2_SAS_HWRATE_MIN_RATE_MASK);
        phy->maximum_linkrate_hw = _transport_convert_phy_link_rate(
            expander_pg1.HwLinkRate >> 4);
        phy->minimum_linkrate = _transport_convert_phy_link_rate(
            expander_pg1.ProgrammedLinkRate & MPI2_SAS_PRATE_MIN_RATE_MASK);
        phy->maximum_linkrate = _transport_convert_phy_link_rate(
            expander_pg1.ProgrammedLinkRate >> 4);

        if ((sas_phy_add(phy))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                sas_phy_free(phy);
                return -1;
        }
        if ((ioc->logging_level & MPT_DEBUG_TRANSPORT))
                dev_printk(KERN_INFO, &phy->dev,
                    "add: handle(0x%04x), sas_addr(0x%016llx)\n"
                    "\tattached_handle(0x%04x), sas_addr(0x%016llx)\n",
                    mpt3sas_phy->handle, (unsigned long long)
                    mpt3sas_phy->identify.sas_address,
                    mpt3sas_phy->attached_handle,
                    (unsigned long long)
                    mpt3sas_phy->remote_identify.sas_address);
        mpt3sas_phy->phy = phy;
        return 0;
}

/**
 * mpt3sas_transport_update_links - refreshing phy link changes
 * @ioc: per adapter object
 * @sas_address: sas address of parent expander or sas host
 * @handle: attached device handle
 * @phy_numberv: phy number
 * @link_rate: new link rate
 *
 * Returns nothing.
 */
void
mpt3sas_transport_update_links(struct MPT3SAS_ADAPTER *ioc,
        u64 sas_address, u16 handle, u8 phy_number, u8 link_rate)
{
        unsigned long flags;
        struct _sas_node *sas_node;
        struct _sas_phy *mpt3sas_phy;

        if (ioc->shost_recovery || ioc->pci_error_recovery)
                return;

        spin_lock_irqsave(&ioc->sas_node_lock, flags);
        sas_node = _transport_sas_node_find_by_sas_address(ioc, sas_address);
        if (!sas_node) {
                spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
                return;
        }

        mpt3sas_phy = &sas_node->phy[phy_number];
        mpt3sas_phy->attached_handle = handle;
        spin_unlock_irqrestore(&ioc->sas_node_lock, flags);

        if (handle && (link_rate >= MPI2_SAS_NEG_LINK_RATE_1_5)) {
                _transport_set_identify(ioc, handle,
                    &mpt3sas_phy->remote_identify);
                _transport_add_phy_to_an_existing_port(ioc, sas_node,
                    mpt3sas_phy, mpt3sas_phy->remote_identify.sas_address);
        } else {
                memset(&mpt3sas_phy->remote_identify, 0 , sizeof(struct
                    sas_identify));
                _transport_del_phy_from_an_existing_port(ioc, sas_node,
                    mpt3sas_phy);
        }

        if (mpt3sas_phy->phy)
                mpt3sas_phy->phy->negotiated_linkrate =
                    _transport_convert_phy_link_rate(link_rate);

        if ((ioc->logging_level & MPT_DEBUG_TRANSPORT))
                dev_printk(KERN_INFO, &mpt3sas_phy->phy->dev,
                    "refresh: parent sas_addr(0x%016llx),\n"
                    "\tlink_rate(0x%02x), phy(%d)\n"
                    "\tattached_handle(0x%04x), sas_addr(0x%016llx)\n",
                    (unsigned long long)sas_address,
                    link_rate, phy_number, handle, (unsigned long long)
                    mpt3sas_phy->remote_identify.sas_address);
}

static inline void *
phy_to_ioc(struct sas_phy *phy)
{
        struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
        return shost_priv(shost);
}

static inline void *
rphy_to_ioc(struct sas_rphy *rphy)
{
        struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent->parent);
        return shost_priv(shost);
}

/* report phy error log structure */
struct phy_error_log_request {
        u8 smp_frame_type; /* 0x40 */
        u8 function; /* 0x11 */
        u8 allocated_response_length;
        u8 request_length; /* 02 */
        u8 reserved_1[5];
        u8 phy_identifier;
        u8 reserved_2[2];
};

/* report phy error log reply structure */
struct phy_error_log_reply {
        u8 smp_frame_type; /* 0x41 */
        u8 function; /* 0x11 */
        u8 function_result;
        u8 response_length;
        __be16 expander_change_count;
        u8 reserved_1[3];
        u8 phy_identifier;
        u8 reserved_2[2];
        __be32 invalid_dword;
        __be32 running_disparity_error;
        __be32 loss_of_dword_sync;
        __be32 phy_reset_problem;
};

/**
 * _transport_get_expander_phy_error_log - return expander counters
 * @ioc: per adapter object
 * @phy: The sas phy object
 *
 * Returns 0 for success, non-zero for failure.
 *
 */
static int
_transport_get_expander_phy_error_log(struct MPT3SAS_ADAPTER *ioc,
        struct sas_phy *phy)
{
        Mpi2SmpPassthroughRequest_t *mpi_request;
        Mpi2SmpPassthroughReply_t *mpi_reply;
        struct phy_error_log_request *phy_error_log_request;
        struct phy_error_log_reply *phy_error_log_reply;
        int rc;
        u16 smid;
        u32 ioc_state;
        unsigned long timeleft;
        void *psge;
        u8 issue_reset = 0;
        void *data_out = NULL;
        dma_addr_t data_out_dma;
        u32 sz;
        u16 wait_state_count;

        if (ioc->shost_recovery || ioc->pci_error_recovery) {
                pr_info(MPT3SAS_FMT "%s: host reset in progress!\n",
                    __func__, ioc->name);
                return -EFAULT;
        }

        mutex_lock(&ioc->transport_cmds.mutex);

        if (ioc->transport_cmds.status != MPT3_CMD_NOT_USED) {
                pr_err(MPT3SAS_FMT "%s: transport_cmds in use\n",
                    ioc->name, __func__);
                rc = -EAGAIN;
                goto out;
        }
        ioc->transport_cmds.status = MPT3_CMD_PENDING;

        wait_state_count = 0;
        ioc_state = mpt3sas_base_get_iocstate(ioc, 1);
        while (ioc_state != MPI2_IOC_STATE_OPERATIONAL) {
                if (wait_state_count++ == 10) {
                        pr_err(MPT3SAS_FMT
                            "%s: failed due to ioc not operational\n",
                            ioc->name, __func__);
                        rc = -EFAULT;
                        goto out;
                }
                ssleep(1);
                ioc_state = mpt3sas_base_get_iocstate(ioc, 1);
                pr_info(MPT3SAS_FMT
                        "%s: waiting for operational state(count=%d)\n",
                        ioc->name, __func__, wait_state_count);
        }
        if (wait_state_count)
                pr_info(MPT3SAS_FMT "%s: ioc is operational\n",
                    ioc->name, __func__);

        smid = mpt3sas_base_get_smid(ioc, ioc->transport_cb_idx);
        if (!smid) {
                pr_err(MPT3SAS_FMT "%s: failed obtaining a smid\n",
                    ioc->name, __func__);
                rc = -EAGAIN;
                goto out;
        }

        mpi_request = mpt3sas_base_get_msg_frame(ioc, smid);
        ioc->transport_cmds.smid = smid;

        sz = sizeof(struct phy_error_log_request) +
            sizeof(struct phy_error_log_reply);
        data_out = pci_alloc_consistent(ioc->pdev, sz, &data_out_dma);
        if (!data_out) {
                pr_err("failure at %s:%d/%s()!\n", __FILE__,
                    __LINE__, __func__);
                rc = -ENOMEM;
                mpt3sas_base_free_smid(ioc, smid);
                goto out;
        }

        rc = -EINVAL;
        memset(data_out, 0, sz);
        phy_error_log_request = data_out;
        phy_error_log_request->smp_frame_type = 0x40;
        phy_error_log_request->function = 0x11;
        phy_error_log_request->request_length = 2;
        phy_error_log_request->allocated_response_length = 0;
        phy_error_log_request->phy_identifier = phy->number;

        memset(mpi_request, 0, sizeof(Mpi2SmpPassthroughRequest_t));
        mpi_request->Function = MPI2_FUNCTION_SMP_PASSTHROUGH;
        mpi_request->PhysicalPort = 0xFF;
        mpi_request->VF_ID = 0; /* TODO */
        mpi_request->VP_ID = 0;
        mpi_request->SASAddress = cpu_to_le64(phy->identify.sas_address);
        mpi_request->RequestDataLength =
            cpu_to_le16(sizeof(struct phy_error_log_request));
        psge = &mpi_request->SGL;

        ioc->build_sg(ioc, psge, data_out_dma,
                sizeof(struct phy_error_log_request),
            data_out_dma + sizeof(struct phy_error_log_request),
            sizeof(struct phy_error_log_reply));

        dtransportprintk(ioc, pr_info(MPT3SAS_FMT
                "phy_error_log - send to sas_addr(0x%016llx), phy(%d)\n",
                ioc->name, (unsigned long long)phy->identify.sas_address,
                phy->number));
        init_completion(&ioc->transport_cmds.done);
        mpt3sas_base_put_smid_default(ioc, smid);
        timeleft = wait_for_completion_timeout(&ioc->transport_cmds.done,
            10*HZ);

        if (!(ioc->transport_cmds.status & MPT3_CMD_COMPLETE)) {
                pr_err(MPT3SAS_FMT "%s: timeout\n",
                    ioc->name, __func__);
                _debug_dump_mf(mpi_request,
                    sizeof(Mpi2SmpPassthroughRequest_t)/4);
                if (!(ioc->transport_cmds.status & MPT3_CMD_RESET))
                        issue_reset = 1;
                goto issue_host_reset;
        }

        dtransportprintk(ioc, pr_info(MPT3SAS_FMT
                "phy_error_log - complete\n", ioc->name));

        if (ioc->transport_cmds.status & MPT3_CMD_REPLY_VALID) {

                mpi_reply = ioc->transport_cmds.reply;

                dtransportprintk(ioc, pr_info(MPT3SAS_FMT
                    "phy_error_log - reply data transfer size(%d)\n",
                    ioc->name, le16_to_cpu(mpi_reply->ResponseDataLength)));

                if (le16_to_cpu(mpi_reply->ResponseDataLength) !=
                    sizeof(struct phy_error_log_reply))
                        goto out;

                phy_error_log_reply = data_out +
                    sizeof(struct phy_error_log_request);

                dtransportprintk(ioc, pr_info(MPT3SAS_FMT
                    "phy_error_log - function_result(%d)\n",
                    ioc->name, phy_error_log_reply->function_result));

                phy->invalid_dword_count =
                    be32_to_cpu(phy_error_log_reply->invalid_dword);
                phy->running_disparity_error_count =
                    be32_to_cpu(phy_error_log_reply->running_disparity_error);
                phy->loss_of_dword_sync_count =
                    be32_to_cpu(phy_error_log_reply->loss_of_dword_sync);
                phy->phy_reset_problem_count =
                    be32_to_cpu(phy_error_log_reply->phy_reset_problem);
                rc = 0;
        } else
                dtransportprintk(ioc, pr_info(MPT3SAS_FMT
                    "phy_error_log - no reply\n", ioc->name));

 issue_host_reset:
        if (issue_reset)
                mpt3sas_base_hard_reset_handler(ioc, CAN_SLEEP,
                    FORCE_BIG_HAMMER);
 out:
        ioc->transport_cmds.status = MPT3_CMD_NOT_USED;
        if (data_out)
                pci_free_consistent(ioc->pdev, sz, data_out, data_out_dma);

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

/**
 * _transport_get_linkerrors - return phy counters for both hba and expanders
 * @phy: The sas phy object
 *
 * Returns 0 for success, non-zero for failure.
 *
 */
static int
_transport_get_linkerrors(struct sas_phy *phy)
{
        struct MPT3SAS_ADAPTER *ioc = phy_to_ioc(phy);
        unsigned long flags;
        Mpi2ConfigReply_t mpi_reply;
        Mpi2SasPhyPage1_t phy_pg1;

        spin_lock_irqsave(&ioc->sas_node_lock, flags);
        if (_transport_sas_node_find_by_sas_address(ioc,
            phy->identify.sas_address) == NULL) {
                spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
                return -EINVAL;
        }
        spin_unlock_irqrestore(&ioc->sas_node_lock, flags);

        if (phy->identify.sas_address != ioc->sas_hba.sas_address)
                return _transport_get_expander_phy_error_log(ioc, phy);

        /* get hba phy error logs */
        if ((mpt3sas_config_get_phy_pg1(ioc, &mpi_reply, &phy_pg1,
                    phy->number))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return -ENXIO;
        }

        if (mpi_reply.IOCStatus || mpi_reply.IOCLogInfo)
                pr_info(MPT3SAS_FMT
                        "phy(%d), ioc_status (0x%04x), loginfo(0x%08x)\n",
                        ioc->name, phy->number,
                        le16_to_cpu(mpi_reply.IOCStatus),
                    le32_to_cpu(mpi_reply.IOCLogInfo));

        phy->invalid_dword_count = le32_to_cpu(phy_pg1.InvalidDwordCount);
        phy->running_disparity_error_count =
            le32_to_cpu(phy_pg1.RunningDisparityErrorCount);
        phy->loss_of_dword_sync_count =
            le32_to_cpu(phy_pg1.LossDwordSynchCount);
        phy->phy_reset_problem_count =
            le32_to_cpu(phy_pg1.PhyResetProblemCount);
        return 0;
}

/**
 * _transport_get_enclosure_identifier -
 * @phy: The sas phy object
 *
 * Obtain the enclosure logical id for an expander.
 * Returns 0 for success, non-zero for failure.
 */
static int
_transport_get_enclosure_identifier(struct sas_rphy *rphy, u64 *identifier)
{
        struct MPT3SAS_ADAPTER *ioc = rphy_to_ioc(rphy);
        struct _sas_device *sas_device;
        unsigned long flags;
        int rc;

        spin_lock_irqsave(&ioc->sas_device_lock, flags);
        sas_device = mpt3sas_scsih_sas_device_find_by_sas_address(ioc,
            rphy->identify.sas_address);
        if (sas_device) {
                *identifier = sas_device->enclosure_logical_id;
                rc = 0;
        } else {
                *identifier = 0;
                rc = -ENXIO;
        }
        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
        return rc;
}

/**
 * _transport_get_bay_identifier -
 * @phy: The sas phy object
 *
 * Returns the slot id for a device that resides inside an enclosure.
 */
static int
_transport_get_bay_identifier(struct sas_rphy *rphy)
{
        struct MPT3SAS_ADAPTER *ioc = rphy_to_ioc(rphy);
        struct _sas_device *sas_device;
        unsigned long flags;
        int rc;

        spin_lock_irqsave(&ioc->sas_device_lock, flags);
        sas_device = mpt3sas_scsih_sas_device_find_by_sas_address(ioc,
            rphy->identify.sas_address);
        if (sas_device)
                rc = sas_device->slot;
        else
                rc = -ENXIO;
        spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
        return rc;
}

/* phy control request structure */
struct phy_control_request {
        u8 smp_frame_type; /* 0x40 */
        u8 function; /* 0x91 */
        u8 allocated_response_length;
        u8 request_length; /* 0x09 */
        u16 expander_change_count;
        u8 reserved_1[3];
        u8 phy_identifier;
        u8 phy_operation;
        u8 reserved_2[13];
        u64 attached_device_name;
        u8 programmed_min_physical_link_rate;
        u8 programmed_max_physical_link_rate;
        u8 reserved_3[6];
};

/* phy control reply structure */
struct phy_control_reply {
        u8 smp_frame_type; /* 0x41 */
        u8 function; /* 0x11 */
        u8 function_result;
        u8 response_length;
};

#define SMP_PHY_CONTROL_LINK_RESET      (0x01)
#define SMP_PHY_CONTROL_HARD_RESET      (0x02)
#define SMP_PHY_CONTROL_DISABLE         (0x03)

/**
 * _transport_expander_phy_control - expander phy control
 * @ioc: per adapter object
 * @phy: The sas phy object
 *
 * Returns 0 for success, non-zero for failure.
 *
 */
static int
_transport_expander_phy_control(struct MPT3SAS_ADAPTER *ioc,
        struct sas_phy *phy, u8 phy_operation)
{
        Mpi2SmpPassthroughRequest_t *mpi_request;
        Mpi2SmpPassthroughReply_t *mpi_reply;
        struct phy_control_request *phy_control_request;
        struct phy_control_reply *phy_control_reply;
        int rc;
        u16 smid;
        u32 ioc_state;
        unsigned long timeleft;
        void *psge;
        u32 sgl_flags;
        u8 issue_reset = 0;
        void *data_out = NULL;
        dma_addr_t data_out_dma;
        u32 sz;
        u16 wait_state_count;

        if (ioc->shost_recovery || ioc->pci_error_recovery) {
                pr_info(MPT3SAS_FMT "%s: host reset in progress!\n",
                    __func__, ioc->name);
                return -EFAULT;
        }

        mutex_lock(&ioc->transport_cmds.mutex);

        if (ioc->transport_cmds.status != MPT3_CMD_NOT_USED) {
                pr_err(MPT3SAS_FMT "%s: transport_cmds in use\n",
                    ioc->name, __func__);
                rc = -EAGAIN;
                goto out;
        }
        ioc->transport_cmds.status = MPT3_CMD_PENDING;

        wait_state_count = 0;
        ioc_state = mpt3sas_base_get_iocstate(ioc, 1);
        while (ioc_state != MPI2_IOC_STATE_OPERATIONAL) {
                if (wait_state_count++ == 10) {
                        pr_err(MPT3SAS_FMT
                            "%s: failed due to ioc not operational\n",
                            ioc->name, __func__);
                        rc = -EFAULT;
                        goto out;
                }
                ssleep(1);
                ioc_state = mpt3sas_base_get_iocstate(ioc, 1);
                pr_info(MPT3SAS_FMT
                        "%s: waiting for operational state(count=%d)\n",
                        ioc->name, __func__, wait_state_count);
        }
        if (wait_state_count)
                pr_info(MPT3SAS_FMT "%s: ioc is operational\n",
                    ioc->name, __func__);

        smid = mpt3sas_base_get_smid(ioc, ioc->transport_cb_idx);
        if (!smid) {
                pr_err(MPT3SAS_FMT "%s: failed obtaining a smid\n",
                    ioc->name, __func__);
                rc = -EAGAIN;
                goto out;
        }

        mpi_request = mpt3sas_base_get_msg_frame(ioc, smid);
        ioc->transport_cmds.smid = smid;

        sz = sizeof(struct phy_control_request) +
            sizeof(struct phy_control_reply);
        data_out = pci_alloc_consistent(ioc->pdev, sz, &data_out_dma);
        if (!data_out) {
                pr_err("failure at %s:%d/%s()!\n", __FILE__,
                    __LINE__, __func__);
                rc = -ENOMEM;
                mpt3sas_base_free_smid(ioc, smid);
                goto out;
        }

        rc = -EINVAL;
        memset(data_out, 0, sz);
        phy_control_request = data_out;
        phy_control_request->smp_frame_type = 0x40;
        phy_control_request->function = 0x91;
        phy_control_request->request_length = 9;
        phy_control_request->allocated_response_length = 0;
        phy_control_request->phy_identifier = phy->number;
        phy_control_request->phy_operation = phy_operation;
        phy_control_request->programmed_min_physical_link_rate =
            phy->minimum_linkrate << 4;
        phy_control_request->programmed_max_physical_link_rate =
            phy->maximum_linkrate << 4;

        memset(mpi_request, 0, sizeof(Mpi2SmpPassthroughRequest_t));
        mpi_request->Function = MPI2_FUNCTION_SMP_PASSTHROUGH;
        mpi_request->PhysicalPort = 0xFF;
        mpi_request->VF_ID = 0; /* TODO */
        mpi_request->VP_ID = 0;
        mpi_request->SASAddress = cpu_to_le64(phy->identify.sas_address);
        mpi_request->RequestDataLength =
            cpu_to_le16(sizeof(struct phy_error_log_request));
        psge = &mpi_request->SGL;

        /* 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 |
            sizeof(struct phy_control_request), 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 |
            sizeof(struct phy_control_reply), data_out_dma +
            sizeof(struct phy_control_request));

        dtransportprintk(ioc, pr_info(MPT3SAS_FMT
                "phy_control - send to sas_addr(0x%016llx), phy(%d), opcode(%d)\n",
                ioc->name, (unsigned long long)phy->identify.sas_address,
                phy->number, phy_operation));
        init_completion(&ioc->transport_cmds.done);
        mpt3sas_base_put_smid_default(ioc, smid);
        timeleft = wait_for_completion_timeout(&ioc->transport_cmds.done,
            10*HZ);

        if (!(ioc->transport_cmds.status & MPT3_CMD_COMPLETE)) {
                pr_err(MPT3SAS_FMT "%s: timeout\n",
                    ioc->name, __func__);
                _debug_dump_mf(mpi_request,
                    sizeof(Mpi2SmpPassthroughRequest_t)/4);
                if (!(ioc->transport_cmds.status & MPT3_CMD_RESET))
                        issue_reset = 1;
                goto issue_host_reset;
        }

        dtransportprintk(ioc, pr_info(MPT3SAS_FMT
                "phy_control - complete\n", ioc->name));

        if (ioc->transport_cmds.status & MPT3_CMD_REPLY_VALID) {

                mpi_reply = ioc->transport_cmds.reply;

                dtransportprintk(ioc, pr_info(MPT3SAS_FMT
                    "phy_control - reply data transfer size(%d)\n",
                    ioc->name, le16_to_cpu(mpi_reply->ResponseDataLength)));

                if (le16_to_cpu(mpi_reply->ResponseDataLength) !=
                    sizeof(struct phy_control_reply))
                        goto out;

                phy_control_reply = data_out +
                    sizeof(struct phy_control_request);

                dtransportprintk(ioc, pr_info(MPT3SAS_FMT
                    "phy_control - function_result(%d)\n",
                    ioc->name, phy_control_reply->function_result));

                rc = 0;
        } else
                dtransportprintk(ioc, pr_info(MPT3SAS_FMT
                    "phy_control - no reply\n", ioc->name));

 issue_host_reset:
        if (issue_reset)
                mpt3sas_base_hard_reset_handler(ioc, CAN_SLEEP,
                    FORCE_BIG_HAMMER);
 out:
        ioc->transport_cmds.status = MPT3_CMD_NOT_USED;
        if (data_out)
                pci_free_consistent(ioc->pdev, sz, data_out, data_out_dma);

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

/**
 * _transport_phy_reset -
 * @phy: The sas phy object
 * @hard_reset:
 *
 * Returns 0 for success, non-zero for failure.
 */
static int
_transport_phy_reset(struct sas_phy *phy, int hard_reset)
{
        struct MPT3SAS_ADAPTER *ioc = phy_to_ioc(phy);
        Mpi2SasIoUnitControlReply_t mpi_reply;
        Mpi2SasIoUnitControlRequest_t mpi_request;
        unsigned long flags;

        spin_lock_irqsave(&ioc->sas_node_lock, flags);
        if (_transport_sas_node_find_by_sas_address(ioc,
            phy->identify.sas_address) == NULL) {
                spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
                return -EINVAL;
        }
        spin_unlock_irqrestore(&ioc->sas_node_lock, flags);

        /* handle expander phys */
        if (phy->identify.sas_address != ioc->sas_hba.sas_address)
                return _transport_expander_phy_control(ioc, phy,
                    (hard_reset == 1) ? SMP_PHY_CONTROL_HARD_RESET :
                    SMP_PHY_CONTROL_LINK_RESET);

        /* handle hba phys */
        memset(&mpi_request, 0, sizeof(Mpi2SasIoUnitControlReply_t));
        mpi_request.Function = MPI2_FUNCTION_SAS_IO_UNIT_CONTROL;
        mpi_request.Operation = hard_reset ?
            MPI2_SAS_OP_PHY_HARD_RESET : MPI2_SAS_OP_PHY_LINK_RESET;
        mpi_request.PhyNum = phy->number;

        if ((mpt3sas_base_sas_iounit_control(ioc, &mpi_reply, &mpi_request))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return -ENXIO;
        }

        if (mpi_reply.IOCStatus || mpi_reply.IOCLogInfo)
                pr_info(MPT3SAS_FMT
                "phy(%d), ioc_status(0x%04x), loginfo(0x%08x)\n",
                ioc->name, phy->number, le16_to_cpu(mpi_reply.IOCStatus),
                    le32_to_cpu(mpi_reply.IOCLogInfo));

        return 0;
}

/**
 * _transport_phy_enable - enable/disable phys
 * @phy: The sas phy object
 * @enable: enable phy when true
 *
 * Only support sas_host direct attached phys.
 * Returns 0 for success, non-zero for failure.
 */
static int
_transport_phy_enable(struct sas_phy *phy, int enable)
{
        struct MPT3SAS_ADAPTER *ioc = phy_to_ioc(phy);
        Mpi2SasIOUnitPage1_t *sas_iounit_pg1 = NULL;
        Mpi2SasIOUnitPage0_t *sas_iounit_pg0 = NULL;
        Mpi2ConfigReply_t mpi_reply;
        u16 ioc_status;
        u16 sz;
        int rc = 0;
        unsigned long flags;
        int i, discovery_active;

        spin_lock_irqsave(&ioc->sas_node_lock, flags);
        if (_transport_sas_node_find_by_sas_address(ioc,
            phy->identify.sas_address) == NULL) {
                spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
                return -EINVAL;
        }
        spin_unlock_irqrestore(&ioc->sas_node_lock, flags);

        /* handle expander phys */
        if (phy->identify.sas_address != ioc->sas_hba.sas_address)
                return _transport_expander_phy_control(ioc, phy,
                    (enable == 1) ? SMP_PHY_CONTROL_LINK_RESET :
                    SMP_PHY_CONTROL_DISABLE);

        /* handle hba phys */

        /* read sas_iounit page 0 */
        sz = offsetof(Mpi2SasIOUnitPage0_t, PhyData) + (ioc->sas_hba.num_phys *
            sizeof(Mpi2SasIOUnit0PhyData_t));
        sas_iounit_pg0 = kzalloc(sz, GFP_KERNEL);
        if (!sas_iounit_pg0) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                rc = -ENOMEM;
                goto out;
        }
        if ((mpt3sas_config_get_sas_iounit_pg0(ioc, &mpi_reply,
            sas_iounit_pg0, sz))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                rc = -ENXIO;
                goto out;
        }
        ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
            MPI2_IOCSTATUS_MASK;
        if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                rc = -EIO;
                goto out;
        }

        /* unable to enable/disable phys when when discovery is active */
        for (i = 0, discovery_active = 0; i < ioc->sas_hba.num_phys ; i++) {
                if (sas_iounit_pg0->PhyData[i].PortFlags &
                    MPI2_SASIOUNIT0_PORTFLAGS_DISCOVERY_IN_PROGRESS) {
                        pr_err(MPT3SAS_FMT "discovery is active on " \
                            "port = %d, phy = %d: unable to enable/disable "
                            "phys, try again later!\n", ioc->name,
                            sas_iounit_pg0->PhyData[i].Port, i);
                        discovery_active = 1;
                }
        }

        if (discovery_active) {
                rc = -EAGAIN;
                goto out;
        }

        /* read sas_iounit page 1 */
        sz = offsetof(Mpi2SasIOUnitPage1_t, PhyData) + (ioc->sas_hba.num_phys *
            sizeof(Mpi2SasIOUnit1PhyData_t));
        sas_iounit_pg1 = kzalloc(sz, GFP_KERNEL);
        if (!sas_iounit_pg1) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                rc = -ENOMEM;
                goto out;
        }
        if ((mpt3sas_config_get_sas_iounit_pg1(ioc, &mpi_reply,
            sas_iounit_pg1, sz))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                rc = -ENXIO;
                goto out;
        }
        ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
            MPI2_IOCSTATUS_MASK;
        if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                rc = -EIO;
                goto out;
        }

        /* copy Port/PortFlags/PhyFlags from page 0 */
        for (i = 0; i < ioc->sas_hba.num_phys ; i++) {
                sas_iounit_pg1->PhyData[i].Port =
                    sas_iounit_pg0->PhyData[i].Port;
                sas_iounit_pg1->PhyData[i].PortFlags =
                    (sas_iounit_pg0->PhyData[i].PortFlags &
                    MPI2_SASIOUNIT0_PORTFLAGS_AUTO_PORT_CONFIG);
                sas_iounit_pg1->PhyData[i].PhyFlags =
                    (sas_iounit_pg0->PhyData[i].PhyFlags &
                    (MPI2_SASIOUNIT0_PHYFLAGS_ZONING_ENABLED +
                    MPI2_SASIOUNIT0_PHYFLAGS_PHY_DISABLED));
        }

        if (enable)
                sas_iounit_pg1->PhyData[phy->number].PhyFlags
                    &= ~MPI2_SASIOUNIT1_PHYFLAGS_PHY_DISABLE;
        else
                sas_iounit_pg1->PhyData[phy->number].PhyFlags
                    |= MPI2_SASIOUNIT1_PHYFLAGS_PHY_DISABLE;

        mpt3sas_config_set_sas_iounit_pg1(ioc, &mpi_reply, sas_iounit_pg1, sz);

        /* link reset */
        if (enable)
                _transport_phy_reset(phy, 0);

 out:
        kfree(sas_iounit_pg1);
        kfree(sas_iounit_pg0);
        return rc;
}

/**
 * _transport_phy_speed - set phy min/max link rates
 * @phy: The sas phy object
 * @rates: rates defined in sas_phy_linkrates
 *
 * Only support sas_host direct attached phys.
 * Returns 0 for success, non-zero for failure.
 */
static int
_transport_phy_speed(struct sas_phy *phy, struct sas_phy_linkrates *rates)
{
        struct MPT3SAS_ADAPTER *ioc = phy_to_ioc(phy);
        Mpi2SasIOUnitPage1_t *sas_iounit_pg1 = NULL;
        Mpi2SasPhyPage0_t phy_pg0;
        Mpi2ConfigReply_t mpi_reply;
        u16 ioc_status;
        u16 sz;
        int i;
        int rc = 0;
        unsigned long flags;

        spin_lock_irqsave(&ioc->sas_node_lock, flags);
        if (_transport_sas_node_find_by_sas_address(ioc,
            phy->identify.sas_address) == NULL) {
                spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
                return -EINVAL;
        }
        spin_unlock_irqrestore(&ioc->sas_node_lock, flags);

        if (!rates->minimum_linkrate)
                rates->minimum_linkrate = phy->minimum_linkrate;
        else if (rates->minimum_linkrate < phy->minimum_linkrate_hw)
                rates->minimum_linkrate = phy->minimum_linkrate_hw;

        if (!rates->maximum_linkrate)
                rates->maximum_linkrate = phy->maximum_linkrate;
        else if (rates->maximum_linkrate > phy->maximum_linkrate_hw)
                rates->maximum_linkrate = phy->maximum_linkrate_hw;

        /* handle expander phys */
        if (phy->identify.sas_address != ioc->sas_hba.sas_address) {
                phy->minimum_linkrate = rates->minimum_linkrate;
                phy->maximum_linkrate = rates->maximum_linkrate;
                return _transport_expander_phy_control(ioc, phy,
                    SMP_PHY_CONTROL_LINK_RESET);
        }

        /* handle hba phys */

        /* sas_iounit page 1 */
        sz = offsetof(Mpi2SasIOUnitPage1_t, PhyData) + (ioc->sas_hba.num_phys *
            sizeof(Mpi2SasIOUnit1PhyData_t));
        sas_iounit_pg1 = kzalloc(sz, GFP_KERNEL);
        if (!sas_iounit_pg1) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                rc = -ENOMEM;
                goto out;
        }
        if ((mpt3sas_config_get_sas_iounit_pg1(ioc, &mpi_reply,
            sas_iounit_pg1, sz))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                rc = -ENXIO;
                goto out;
        }
        ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
            MPI2_IOCSTATUS_MASK;
        if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                rc = -EIO;
                goto out;
        }

        for (i = 0; i < ioc->sas_hba.num_phys; i++) {
                if (phy->number != i) {
                        sas_iounit_pg1->PhyData[i].MaxMinLinkRate =
                            (ioc->sas_hba.phy[i].phy->minimum_linkrate +
                            (ioc->sas_hba.phy[i].phy->maximum_linkrate << 4));
                } else {
                        sas_iounit_pg1->PhyData[i].MaxMinLinkRate =
                            (rates->minimum_linkrate +
                            (rates->maximum_linkrate << 4));
                }
        }

        if (mpt3sas_config_set_sas_iounit_pg1(ioc, &mpi_reply, sas_iounit_pg1,
            sz)) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                rc = -ENXIO;
                goto out;
        }

        /* link reset */
        _transport_phy_reset(phy, 0);

        /* read phy page 0, then update the rates in the sas transport phy */
        if (!mpt3sas_config_get_phy_pg0(ioc, &mpi_reply, &phy_pg0,
            phy->number)) {
                phy->minimum_linkrate = _transport_convert_phy_link_rate(
                    phy_pg0.ProgrammedLinkRate & MPI2_SAS_PRATE_MIN_RATE_MASK);
                phy->maximum_linkrate = _transport_convert_phy_link_rate(
                    phy_pg0.ProgrammedLinkRate >> 4);
                phy->negotiated_linkrate = _transport_convert_phy_link_rate(
                    phy_pg0.NegotiatedLinkRate &
                    MPI2_SAS_NEG_LINK_RATE_MASK_PHYSICAL);
        }

 out:
        kfree(sas_iounit_pg1);
        return rc;
}

/**
 * _transport_smp_handler - transport portal for smp passthru
 * @shost: shost object
 * @rphy: sas transport rphy object
 * @req:
 *
 * This used primarily for smp_utils.
 * Example:
 *           smp_rep_general /sys/class/bsg/expander-5:0
 */
static int
_transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
        struct request *req)
{
        struct MPT3SAS_ADAPTER *ioc = shost_priv(shost);
        Mpi2SmpPassthroughRequest_t *mpi_request;
        Mpi2SmpPassthroughReply_t *mpi_reply;
        int rc;
        u16 smid;
        u32 ioc_state;
        unsigned long timeleft;
        void *psge;
        u8 issue_reset = 0;
        dma_addr_t dma_addr_in = 0;
        dma_addr_t dma_addr_out = 0;
        dma_addr_t pci_dma_in = 0;
        dma_addr_t pci_dma_out = 0;
        void *pci_addr_in = NULL;
        void *pci_addr_out = NULL;
        u16 wait_state_count;
        struct request *rsp = req->next_rq;
        struct bio_vec bvec;
        struct bvec_iter iter;

        if (!rsp) {
                pr_err(MPT3SAS_FMT "%s: the smp response space is missing\n",
                        ioc->name, __func__);
                return -EINVAL;
        }

        if (ioc->shost_recovery || ioc->pci_error_recovery) {
                pr_info(MPT3SAS_FMT "%s: host reset in progress!\n",
                    __func__, ioc->name);
                return -EFAULT;
        }

        rc = mutex_lock_interruptible(&ioc->transport_cmds.mutex);
        if (rc)
                return rc;

        if (ioc->transport_cmds.status != MPT3_CMD_NOT_USED) {
                pr_err(MPT3SAS_FMT "%s: transport_cmds in use\n", ioc->name,
                    __func__);
                rc = -EAGAIN;
                goto out;
        }
        ioc->transport_cmds.status = MPT3_CMD_PENDING;

        /* Check if the request is split across multiple segments */
        if (bio_multiple_segments(req->bio)) {
                u32 offset = 0;

                /* Allocate memory and copy the request */
                pci_addr_out = pci_alloc_consistent(ioc->pdev,
                    blk_rq_bytes(req), &pci_dma_out);
                if (!pci_addr_out) {
                        pr_info(MPT3SAS_FMT "%s(): PCI Addr out = NULL\n",
                            ioc->name, __func__);
                        rc = -ENOMEM;
                        goto out;
                }

                bio_for_each_segment(bvec, req->bio, iter) {
                        memcpy(pci_addr_out + offset,
                            page_address(bvec.bv_page) + bvec.bv_offset,
                            bvec.bv_len);
                        offset += bvec.bv_len;
                }
        } else {
                dma_addr_out = pci_map_single(ioc->pdev, bio_data(req->bio),
                    blk_rq_bytes(req), PCI_DMA_BIDIRECTIONAL);
                if (!dma_addr_out) {
                        pr_info(MPT3SAS_FMT "%s(): DMA Addr out = NULL\n",
                            ioc->name, __func__);
                        rc = -ENOMEM;
                        goto free_pci;
                }
        }

        /* Check if the response needs to be populated across
         * multiple segments */
        if (bio_multiple_segments(rsp->bio)) {
                pci_addr_in = pci_alloc_consistent(ioc->pdev, blk_rq_bytes(rsp),
                    &pci_dma_in);
                if (!pci_addr_in) {
                        pr_info(MPT3SAS_FMT "%s(): PCI Addr in = NULL\n",
                            ioc->name, __func__);
                        rc = -ENOMEM;
                        goto unmap;
                }
        } else {
                dma_addr_in =  pci_map_single(ioc->pdev, bio_data(rsp->bio),
                    blk_rq_bytes(rsp), PCI_DMA_BIDIRECTIONAL);
                if (!dma_addr_in) {
                        pr_info(MPT3SAS_FMT "%s(): DMA Addr in = NULL\n",
                            ioc->name, __func__);
                        rc = -ENOMEM;
                        goto unmap;
                }
        }

        wait_state_count = 0;
        ioc_state = mpt3sas_base_get_iocstate(ioc, 1);
        while (ioc_state != MPI2_IOC_STATE_OPERATIONAL) {
                if (wait_state_count++ == 10) {
                        pr_err(MPT3SAS_FMT
                            "%s: failed due to ioc not operational\n",
                            ioc->name, __func__);
                        rc = -EFAULT;
                        goto unmap;
                }
                ssleep(1);
                ioc_state = mpt3sas_base_get_iocstate(ioc, 1);
                pr_info(MPT3SAS_FMT
                        "%s: waiting for operational state(count=%d)\n",
                        ioc->name, __func__, wait_state_count);
        }
        if (wait_state_count)
                pr_info(MPT3SAS_FMT "%s: ioc is operational\n",
                    ioc->name, __func__);

        smid = mpt3sas_base_get_smid(ioc, ioc->transport_cb_idx);
        if (!smid) {
                pr_err(MPT3SAS_FMT "%s: failed obtaining a smid\n",
                    ioc->name, __func__);
                rc = -EAGAIN;
                goto unmap;
        }

        rc = 0;
        mpi_request = mpt3sas_base_get_msg_frame(ioc, smid);
        ioc->transport_cmds.smid = smid;

        memset(mpi_request, 0, sizeof(Mpi2SmpPassthroughRequest_t));
        mpi_request->Function = MPI2_FUNCTION_SMP_PASSTHROUGH;
        mpi_request->PhysicalPort = 0xFF;
        mpi_request->SASAddress = (rphy) ?
            cpu_to_le64(rphy->identify.sas_address) :
            cpu_to_le64(ioc->sas_hba.sas_address);
        mpi_request->RequestDataLength = cpu_to_le16(blk_rq_bytes(req) - 4);
        psge = &mpi_request->SGL;

        if (bio_multiple_segments(req->bio))
                ioc->build_sg(ioc, psge, pci_dma_out, (blk_rq_bytes(req) - 4),
                    pci_dma_in, (blk_rq_bytes(rsp) + 4));
        else
                ioc->build_sg(ioc, psge, dma_addr_out, (blk_rq_bytes(req) - 4),
                    dma_addr_in, (blk_rq_bytes(rsp) + 4));

        dtransportprintk(ioc, pr_info(MPT3SAS_FMT
                "%s - sending smp request\n", ioc->name, __func__));

        init_completion(&ioc->transport_cmds.done);
        mpt3sas_base_put_smid_default(ioc, smid);
        timeleft = wait_for_completion_timeout(&ioc->transport_cmds.done,
            10*HZ);

        if (!(ioc->transport_cmds.status & MPT3_CMD_COMPLETE)) {
                pr_err(MPT3SAS_FMT "%s : timeout\n",
                    __func__, ioc->name);
                _debug_dump_mf(mpi_request,
                    sizeof(Mpi2SmpPassthroughRequest_t)/4);
                if (!(ioc->transport_cmds.status & MPT3_CMD_RESET))
                        issue_reset = 1;
                goto issue_host_reset;
        }

        dtransportprintk(ioc, pr_info(MPT3SAS_FMT
                "%s - complete\n", ioc->name, __func__));

        if (ioc->transport_cmds.status & MPT3_CMD_REPLY_VALID) {

                mpi_reply = ioc->transport_cmds.reply;

                dtransportprintk(ioc, pr_info(MPT3SAS_FMT
                    "%s - reply data transfer size(%d)\n",
                    ioc->name, __func__,
                    le16_to_cpu(mpi_reply->ResponseDataLength)));

                memcpy(req->sense, mpi_reply, sizeof(*mpi_reply));
                req->sense_len = sizeof(*mpi_reply);
                req->resid_len = 0;
                rsp->resid_len -=
                    le16_to_cpu(mpi_reply->ResponseDataLength);

                /* check if the resp needs to be copied from the allocated
                 * pci mem */
                if (bio_multiple_segments(rsp->bio)) {
                        u32 offset = 0;
                        u32 bytes_to_copy =
                            le16_to_cpu(mpi_reply->ResponseDataLength);
                        bio_for_each_segment(bvec, rsp->bio, iter) {
                                if (bytes_to_copy <= bvec.bv_len) {
                                        memcpy(page_address(bvec.bv_page) +
                                            bvec.bv_offset, pci_addr_in +
                                            offset, bytes_to_copy);
                                        break;
                                } else {
                                        memcpy(page_address(bvec.bv_page) +
                                            bvec.bv_offset, pci_addr_in +
                                            offset, bvec.bv_len);
                                        bytes_to_copy -= bvec.bv_len;
                                }
                                offset += bvec.bv_len;
                        }
                }
        } else {
                dtransportprintk(ioc, pr_info(MPT3SAS_FMT
                    "%s - no reply\n", ioc->name, __func__));
                rc = -ENXIO;
        }

 issue_host_reset:
        if (issue_reset) {
                mpt3sas_base_hard_reset_handler(ioc, CAN_SLEEP,
                    FORCE_BIG_HAMMER);
                rc = -ETIMEDOUT;
        }

 unmap:
        if (dma_addr_out)
                pci_unmap_single(ioc->pdev, dma_addr_out, blk_rq_bytes(req),
                    PCI_DMA_BIDIRECTIONAL);
        if (dma_addr_in)
                pci_unmap_single(ioc->pdev, dma_addr_in, blk_rq_bytes(rsp),
                    PCI_DMA_BIDIRECTIONAL);

 free_pci:
        if (pci_addr_out)
                pci_free_consistent(ioc->pdev, blk_rq_bytes(req), pci_addr_out,
                    pci_dma_out);

        if (pci_addr_in)
                pci_free_consistent(ioc->pdev, blk_rq_bytes(rsp), pci_addr_in,
                    pci_dma_in);

 out:
        ioc->transport_cmds.status = MPT3_CMD_NOT_USED;
        mutex_unlock(&ioc->transport_cmds.mutex);
        return rc;
}

struct sas_function_template mpt3sas_transport_functions = {
        .get_linkerrors         = _transport_get_linkerrors,
        .get_enclosure_identifier = _transport_get_enclosure_identifier,
        .get_bay_identifier     = _transport_get_bay_identifier,
        .phy_reset              = _transport_phy_reset,
        .phy_enable             = _transport_phy_enable,
        .set_phy_speed          = _transport_phy_speed,
        .smp_handler            = _transport_smp_handler,
};

struct scsi_transport_template *mpt3sas_transport_template;