mv_sas.c

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/*
 * Marvell 88SE64xx/88SE94xx main function
 *
 * Copyright 2007 Red Hat, Inc.
 * Copyright 2008 Marvell. <[email protected]>
 * Copyright 2009-2011 Marvell. <[email protected]>
 *
 * This file is licensed under GPLv2.
 *
 * 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; version 2 of the
 * License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
*/

#include "mv_sas.h"

static int mvs_find_tag(struct mvs_info *mvi, struct sas_task *task, u32 *tag)
{
    if (task->lldd_task) {
        struct mvs_slot_info *slot;
        slot = task->lldd_task;
        *tag = slot->slot_tag;
        return 1;
    }
    return 0;
}

void mvs_tag_clear(struct mvs_info *mvi, u32 tag)
{
    void *bitmap = mvi->tags;
    clear_bit(tag, bitmap);
}

void mvs_tag_free(struct mvs_info *mvi, u32 tag)
{
    mvs_tag_clear(mvi, tag);
}

void mvs_tag_set(struct mvs_info *mvi, unsigned int tag)
{
    void *bitmap = mvi->tags;
    set_bit(tag, bitmap);
}

inline int mvs_tag_alloc(struct mvs_info *mvi, u32 *tag_out)
{
    unsigned int index, tag;
    void *bitmap = mvi->tags;

    index = find_first_zero_bit(bitmap, mvi->tags_num);
    tag = index;
    if (tag >= mvi->tags_num)
        return -SAS_QUEUE_FULL;
    mvs_tag_set(mvi, tag);
    *tag_out = tag;
    return 0;
}

void mvs_tag_init(struct mvs_info *mvi)
{
    int i;
    for (i = 0; i < mvi->tags_num; ++i)
        mvs_tag_clear(mvi, i);
}

struct mvs_info *mvs_find_dev_mvi(struct domain_device *dev)
{
    unsigned long i = 0, j = 0, hi = 0;
    struct sas_ha_struct *sha = dev->port->ha;
    struct mvs_info *mvi = NULL;
    struct asd_sas_phy *phy;

    while (sha->sas_port[i]) {
        if (sha->sas_port[i] == dev->port) {
            phy =  container_of(sha->sas_port[i]->phy_list.next,
                struct asd_sas_phy, port_phy_el);
            j = 0;
            while (sha->sas_phy[j]) {
                if (sha->sas_phy[j] == phy)
                    break;
                j++;
            }
            break;
        }
        i++;
    }
    hi = j/((struct mvs_prv_info *)sha->lldd_ha)->n_phy;
    mvi = ((struct mvs_prv_info *)sha->lldd_ha)->mvi[hi];

    return mvi;

}

int mvs_find_dev_phyno(struct domain_device *dev, int *phyno)
{
    unsigned long i = 0, j = 0, n = 0, num = 0;
    struct mvs_device *mvi_dev = (struct mvs_device *)dev->lldd_dev;
    struct mvs_info *mvi = mvi_dev->mvi_info;
    struct sas_ha_struct *sha = dev->port->ha;

    while (sha->sas_port[i]) {
        if (sha->sas_port[i] == dev->port) {
            struct asd_sas_phy *phy;
            list_for_each_entry(phy,
                &sha->sas_port[i]->phy_list, port_phy_el) {
                j = 0;
                while (sha->sas_phy[j]) {
                    if (sha->sas_phy[j] == phy)
                        break;
                    j++;
                }
                phyno[n] = (j >= mvi->chip->n_phy) ?
                    (j - mvi->chip->n_phy) : j;
                num++;
                n++;
            }
            break;
        }
        i++;
    }
    return num;
}

struct mvs_device *mvs_find_dev_by_reg_set(struct mvs_info *mvi,
                        u8 reg_set)
{
    u32 dev_no;
    for (dev_no = 0; dev_no < MVS_MAX_DEVICES; dev_no++) {
        if (mvi->devices[dev_no].taskfileset == MVS_ID_NOT_MAPPED)
            continue;

        if (mvi->devices[dev_no].taskfileset == reg_set)
            return &mvi->devices[dev_no];
    }
    return NULL;
}

static inline void mvs_free_reg_set(struct mvs_info *mvi,
                struct mvs_device *dev)
{
    if (!dev) {
        mv_printk("device has been free.\n");
        return;
    }
    if (dev->taskfileset == MVS_ID_NOT_MAPPED)
        return;
    MVS_CHIP_DISP->free_reg_set(mvi, &dev->taskfileset);
}

static inline u8 mvs_assign_reg_set(struct mvs_info *mvi,
                struct mvs_device *dev)
{
    if (dev->taskfileset != MVS_ID_NOT_MAPPED)
        return 0;
    return MVS_CHIP_DISP->assign_reg_set(mvi, &dev->taskfileset);
}

void mvs_phys_reset(struct mvs_info *mvi, u32 phy_mask, int hard)
{
    u32 no;
    for_each_phy(phy_mask, phy_mask, no) {
        if (!(phy_mask & 1))
            continue;
        MVS_CHIP_DISP->phy_reset(mvi, no, hard);
    }
}

int mvs_phy_control(struct asd_sas_phy *sas_phy, enum phy_func func,
            void *funcdata)
{
    int rc = 0, phy_id = sas_phy->id;
    u32 tmp, i = 0, hi;
    struct sas_ha_struct *sha = sas_phy->ha;
    struct mvs_info *mvi = NULL;

    while (sha->sas_phy[i]) {
        if (sha->sas_phy[i] == sas_phy)
            break;
        i++;
    }
    hi = i/((struct mvs_prv_info *)sha->lldd_ha)->n_phy;
    mvi = ((struct mvs_prv_info *)sha->lldd_ha)->mvi[hi];

    switch (func) {
    case PHY_FUNC_SET_LINK_RATE:
        MVS_CHIP_DISP->phy_set_link_rate(mvi, phy_id, funcdata);
        break;

    case PHY_FUNC_HARD_RESET:
        tmp = MVS_CHIP_DISP->read_phy_ctl(mvi, phy_id);
        if (tmp & PHY_RST_HARD)
            break;
        MVS_CHIP_DISP->phy_reset(mvi, phy_id, MVS_HARD_RESET);
        break;

    case PHY_FUNC_LINK_RESET:
        MVS_CHIP_DISP->phy_enable(mvi, phy_id);
        MVS_CHIP_DISP->phy_reset(mvi, phy_id, MVS_SOFT_RESET);
        break;

    case PHY_FUNC_DISABLE:
        MVS_CHIP_DISP->phy_disable(mvi, phy_id);
        break;
    case PHY_FUNC_RELEASE_SPINUP_HOLD:
    default:
        rc = -ENOSYS;
    }
    msleep(200);
    return rc;
}

void __devinit mvs_set_sas_addr(struct mvs_info *mvi, int port_id,
                u32 off_lo, u32 off_hi, u64 sas_addr)
{
    u32 lo = (u32)sas_addr;
    u32 hi = (u32)(sas_addr>>32);

    MVS_CHIP_DISP->write_port_cfg_addr(mvi, port_id, off_lo);
    MVS_CHIP_DISP->write_port_cfg_data(mvi, port_id, lo);
    MVS_CHIP_DISP->write_port_cfg_addr(mvi, port_id, off_hi);
    MVS_CHIP_DISP->write_port_cfg_data(mvi, port_id, hi);
}

static void mvs_bytes_dmaed(struct mvs_info *mvi, int i)
{
    struct mvs_phy *phy = &mvi->phy[i];
    struct asd_sas_phy *sas_phy = &phy->sas_phy;
    struct sas_ha_struct *sas_ha;
    if (!phy->phy_attached)
        return;

    if (!(phy->att_dev_info & PORT_DEV_TRGT_MASK)
        && phy->phy_type & PORT_TYPE_SAS) {
        return;
    }

    sas_ha = mvi->sas;
    sas_ha->notify_phy_event(sas_phy, PHYE_OOB_DONE);

    if (sas_phy->phy) {
        struct sas_phy *sphy = sas_phy->phy;

        sphy->negotiated_linkrate = sas_phy->linkrate;
        sphy->minimum_linkrate = phy->minimum_linkrate;
        sphy->minimum_linkrate_hw = SAS_LINK_RATE_1_5_GBPS;
        sphy->maximum_linkrate = phy->maximum_linkrate;
        sphy->maximum_linkrate_hw = MVS_CHIP_DISP->phy_max_link_rate();
    }

    if (phy->phy_type & PORT_TYPE_SAS) {
        struct sas_identify_frame *id;

        id = (struct sas_identify_frame *)phy->frame_rcvd;
        id->dev_type = phy->identify.device_type;
        id->initiator_bits = SAS_PROTOCOL_ALL;
        id->target_bits = phy->identify.target_port_protocols;

        /* direct attached SAS device */
        if (phy->att_dev_info & PORT_SSP_TRGT_MASK) {
            MVS_CHIP_DISP->write_port_cfg_addr(mvi, i, PHYR_PHY_STAT);
            MVS_CHIP_DISP->write_port_cfg_data(mvi, i, 0x00);
        }
    } else if (phy->phy_type & PORT_TYPE_SATA) {
        /*Nothing*/
    }
    mv_dprintk("phy %d byte dmaded.\n", i + mvi->id * mvi->chip->n_phy);

    sas_phy->frame_rcvd_size = phy->frame_rcvd_size;

    mvi->sas->notify_port_event(sas_phy,
                   PORTE_BYTES_DMAED);
}

void mvs_scan_start(struct Scsi_Host *shost)
{
    int i, j;
    unsigned short core_nr;
    struct mvs_info *mvi;
    struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
    struct mvs_prv_info *mvs_prv = sha->lldd_ha;

    core_nr = ((struct mvs_prv_info *)sha->lldd_ha)->n_host;

    for (j = 0; j < core_nr; j++) {
        mvi = ((struct mvs_prv_info *)sha->lldd_ha)->mvi[j];
        for (i = 0; i < mvi->chip->n_phy; ++i)
            mvs_bytes_dmaed(mvi, i);
    }
    mvs_prv->scan_finished = 1;
}

int mvs_scan_finished(struct Scsi_Host *shost, unsigned long time)
{
    struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
    struct mvs_prv_info *mvs_prv = sha->lldd_ha;

    if (mvs_prv->scan_finished == 0)
        return 0;

    sas_drain_work(sha);
    return 1;
}

static int mvs_task_prep_smp(struct mvs_info *mvi,
                 struct mvs_task_exec_info *tei)
{
    int elem, rc, i;
    struct sas_task *task = tei->task;
    struct mvs_cmd_hdr *hdr = tei->hdr;
    struct domain_device *dev = task->dev;
    struct asd_sas_port *sas_port = dev->port;
    struct scatterlist *sg_req, *sg_resp;
    u32 req_len, resp_len, tag = tei->tag;
    void *buf_tmp;
    u8 *buf_oaf;
    dma_addr_t buf_tmp_dma;
    void *buf_prd;
    struct mvs_slot_info *slot = &mvi->slot_info[tag];
    u32 flags = (tei->n_elem << MCH_PRD_LEN_SHIFT);

    /*
     * DMA-map SMP request, response buffers
     */
    sg_req = &task->smp_task.smp_req;
    elem = dma_map_sg(mvi->dev, sg_req, 1, PCI_DMA_TODEVICE);
    if (!elem)
        return -ENOMEM;
    req_len = sg_dma_len(sg_req);

    sg_resp = &task->smp_task.smp_resp;
    elem = dma_map_sg(mvi->dev, sg_resp, 1, PCI_DMA_FROMDEVICE);
    if (!elem) {
        rc = -ENOMEM;
        goto err_out;
    }
    resp_len = SB_RFB_MAX;

    /* must be in dwords */
    if ((req_len & 0x3) || (resp_len & 0x3)) {
        rc = -EINVAL;
        goto err_out_2;
    }

    /*
     * arrange MVS_SLOT_BUF_SZ-sized DMA buffer according to our needs
     */

    /* region 1: command table area (MVS_SSP_CMD_SZ bytes) ***** */
    buf_tmp = slot->buf;
    buf_tmp_dma = slot->buf_dma;

    hdr->cmd_tbl = cpu_to_le64(sg_dma_address(sg_req));

    /* region 2: open address frame area (MVS_OAF_SZ bytes) ********* */
    buf_oaf = buf_tmp;
    hdr->open_frame = cpu_to_le64(buf_tmp_dma);

    buf_tmp += MVS_OAF_SZ;
    buf_tmp_dma += MVS_OAF_SZ;

    /* region 3: PRD table *********************************** */
    buf_prd = buf_tmp;
    if (tei->n_elem)
        hdr->prd_tbl = cpu_to_le64(buf_tmp_dma);
    else
        hdr->prd_tbl = 0;

    i = MVS_CHIP_DISP->prd_size() * tei->n_elem;
    buf_tmp += i;
    buf_tmp_dma += i;

    /* region 4: status buffer (larger the PRD, smaller this buf) ****** */
    slot->response = buf_tmp;
    hdr->status_buf = cpu_to_le64(buf_tmp_dma);
    if (mvi->flags & MVF_FLAG_SOC)
        hdr->reserved[0] = 0;

    /*
     * Fill in TX ring and command slot header
     */
    slot->tx = mvi->tx_prod;
    mvi->tx[mvi->tx_prod] = cpu_to_le32((TXQ_CMD_SMP << TXQ_CMD_SHIFT) |
                    TXQ_MODE_I | tag |
                    (sas_port->phy_mask << TXQ_PHY_SHIFT));

    hdr->flags |= flags;
    hdr->lens = cpu_to_le32(((resp_len / 4) << 16) | ((req_len - 4) / 4));
    hdr->tags = cpu_to_le32(tag);
    hdr->data_len = 0;

    /* generate open address frame hdr (first 12 bytes) */
    /* initiator, SMP, ftype 1h */
    buf_oaf[0] = (1 << 7) | (PROTOCOL_SMP << 4) | 0x01;
    buf_oaf[1] = min(sas_port->linkrate, dev->linkrate) & 0xf;
    *(u16 *)(buf_oaf + 2) = 0xFFFF;     /* SAS SPEC */
    memcpy(buf_oaf + 4, dev->sas_addr, SAS_ADDR_SIZE);

    /* fill in PRD (scatter/gather) table, if any */
    MVS_CHIP_DISP->make_prd(task->scatter, tei->n_elem, buf_prd);

    return 0;

err_out_2:
    dma_unmap_sg(mvi->dev, &tei->task->smp_task.smp_resp, 1,
             PCI_DMA_FROMDEVICE);
err_out:
    dma_unmap_sg(mvi->dev, &tei->task->smp_task.smp_req, 1,
             PCI_DMA_TODEVICE);
    return rc;
}

static u32 mvs_get_ncq_tag(struct sas_task *task, u32 *tag)
{
    struct ata_queued_cmd *qc = task->uldd_task;

    if (qc) {
        if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
            qc->tf.command == ATA_CMD_FPDMA_READ) {
            *tag = qc->tag;
            return 1;
        }
    }

    return 0;
}

static int mvs_task_prep_ata(struct mvs_info *mvi,
                 struct mvs_task_exec_info *tei)
{
    struct sas_task *task = tei->task;
    struct domain_device *dev = task->dev;
    struct mvs_device *mvi_dev = dev->lldd_dev;
    struct mvs_cmd_hdr *hdr = tei->hdr;
    struct asd_sas_port *sas_port = dev->port;
    struct mvs_slot_info *slot;
    void *buf_prd;
    u32 tag = tei->tag, hdr_tag;
    u32 flags, del_q;
    void *buf_tmp;
    u8 *buf_cmd, *buf_oaf;
    dma_addr_t buf_tmp_dma;
    u32 i, req_len, resp_len;
    const u32 max_resp_len = SB_RFB_MAX;

    if (mvs_assign_reg_set(mvi, mvi_dev) == MVS_ID_NOT_MAPPED) {
        mv_dprintk("Have not enough regiset for dev %d.\n",
            mvi_dev->device_id);
        return -EBUSY;
    }
    slot = &mvi->slot_info[tag];
    slot->tx = mvi->tx_prod;
    del_q = TXQ_MODE_I | tag |
        (TXQ_CMD_STP << TXQ_CMD_SHIFT) |
        (sas_port->phy_mask << TXQ_PHY_SHIFT) |
        (mvi_dev->taskfileset << TXQ_SRS_SHIFT);
    mvi->tx[mvi->tx_prod] = cpu_to_le32(del_q);

    if (task->data_dir == DMA_FROM_DEVICE)
        flags = (MVS_CHIP_DISP->prd_count() << MCH_PRD_LEN_SHIFT);
    else
        flags = (tei->n_elem << MCH_PRD_LEN_SHIFT);

    if (task->ata_task.use_ncq)
        flags |= MCH_FPDMA;
    if (dev->sata_dev.command_set == ATAPI_COMMAND_SET) {
        if (task->ata_task.fis.command != ATA_CMD_ID_ATAPI)
            flags |= MCH_ATAPI;
    }

    hdr->flags = cpu_to_le32(flags);

    if (task->ata_task.use_ncq && mvs_get_ncq_tag(task, &hdr_tag))
        task->ata_task.fis.sector_count |= (u8) (hdr_tag << 3);
    else
        hdr_tag = tag;

    hdr->tags = cpu_to_le32(hdr_tag);

    hdr->data_len = cpu_to_le32(task->total_xfer_len);

    /*
     * arrange MVS_SLOT_BUF_SZ-sized DMA buffer according to our needs
     */

    /* region 1: command table area (MVS_ATA_CMD_SZ bytes) ************** */
    buf_cmd = buf_tmp = slot->buf;
    buf_tmp_dma = slot->buf_dma;

    hdr->cmd_tbl = cpu_to_le64(buf_tmp_dma);

    buf_tmp += MVS_ATA_CMD_SZ;
    buf_tmp_dma += MVS_ATA_CMD_SZ;

    /* region 2: open address frame area (MVS_OAF_SZ bytes) ********* */
    /* used for STP.  unused for SATA? */
    buf_oaf = buf_tmp;
    hdr->open_frame = cpu_to_le64(buf_tmp_dma);

    buf_tmp += MVS_OAF_SZ;
    buf_tmp_dma += MVS_OAF_SZ;

    /* region 3: PRD table ********************************************* */
    buf_prd = buf_tmp;

    if (tei->n_elem)
        hdr->prd_tbl = cpu_to_le64(buf_tmp_dma);
    else
        hdr->prd_tbl = 0;
    i = MVS_CHIP_DISP->prd_size() * MVS_CHIP_DISP->prd_count();

    buf_tmp += i;
    buf_tmp_dma += i;

    /* region 4: status buffer (larger the PRD, smaller this buf) ****** */
    slot->response = buf_tmp;
    hdr->status_buf = cpu_to_le64(buf_tmp_dma);
    if (mvi->flags & MVF_FLAG_SOC)
        hdr->reserved[0] = 0;

    req_len = sizeof(struct host_to_dev_fis);
    resp_len = MVS_SLOT_BUF_SZ - MVS_ATA_CMD_SZ -
        sizeof(struct mvs_err_info) - i;

    /* request, response lengths */
    resp_len = min(resp_len, max_resp_len);
    hdr->lens = cpu_to_le32(((resp_len / 4) << 16) | (req_len / 4));

    if (likely(!task->ata_task.device_control_reg_update))
        task->ata_task.fis.flags |= 0x80; /* C=1: update ATA cmd reg */
    /* fill in command FIS and ATAPI CDB */
    memcpy(buf_cmd, &task->ata_task.fis, sizeof(struct host_to_dev_fis));
    if (dev->sata_dev.command_set == ATAPI_COMMAND_SET)
        memcpy(buf_cmd + STP_ATAPI_CMD,
            task->ata_task.atapi_packet, 16);

    /* generate open address frame hdr (first 12 bytes) */
    /* initiator, STP, ftype 1h */
    buf_oaf[0] = (1 << 7) | (PROTOCOL_STP << 4) | 0x1;
    buf_oaf[1] = min(sas_port->linkrate, dev->linkrate) & 0xf;
    *(u16 *)(buf_oaf + 2) = cpu_to_be16(mvi_dev->device_id + 1);
    memcpy(buf_oaf + 4, dev->sas_addr, SAS_ADDR_SIZE);

    /* fill in PRD (scatter/gather) table, if any */
    MVS_CHIP_DISP->make_prd(task->scatter, tei->n_elem, buf_prd);

    if (task->data_dir == DMA_FROM_DEVICE)
        MVS_CHIP_DISP->dma_fix(mvi, sas_port->phy_mask,
                TRASH_BUCKET_SIZE, tei->n_elem, buf_prd);

    return 0;
}

static int mvs_task_prep_ssp(struct mvs_info *mvi,
                 struct mvs_task_exec_info *tei, int is_tmf,
                 struct mvs_tmf_task *tmf)
{
    struct sas_task *task = tei->task;
    struct mvs_cmd_hdr *hdr = tei->hdr;
    struct mvs_port *port = tei->port;
    struct domain_device *dev = task->dev;
    struct mvs_device *mvi_dev = dev->lldd_dev;
    struct asd_sas_port *sas_port = dev->port;
    struct mvs_slot_info *slot;
    void *buf_prd;
    struct ssp_frame_hdr *ssp_hdr;
    void *buf_tmp;
    u8 *buf_cmd, *buf_oaf, fburst = 0;
    dma_addr_t buf_tmp_dma;
    u32 flags;
    u32 resp_len, req_len, i, tag = tei->tag;
    const u32 max_resp_len = SB_RFB_MAX;
    u32 phy_mask;

    slot = &mvi->slot_info[tag];

    phy_mask = ((port->wide_port_phymap) ? port->wide_port_phymap :
        sas_port->phy_mask) & TXQ_PHY_MASK;

    slot->tx = mvi->tx_prod;
    mvi->tx[mvi->tx_prod] = cpu_to_le32(TXQ_MODE_I | tag |
                (TXQ_CMD_SSP << TXQ_CMD_SHIFT) |
                (phy_mask << TXQ_PHY_SHIFT));

    flags = MCH_RETRY;
    if (task->ssp_task.enable_first_burst) {
        flags |= MCH_FBURST;
        fburst = (1 << 7);
    }
    if (is_tmf)
        flags |= (MCH_SSP_FR_TASK << MCH_SSP_FR_TYPE_SHIFT);
    else
        flags |= (MCH_SSP_FR_CMD << MCH_SSP_FR_TYPE_SHIFT);

    hdr->flags = cpu_to_le32(flags | (tei->n_elem << MCH_PRD_LEN_SHIFT));
    hdr->tags = cpu_to_le32(tag);
    hdr->data_len = cpu_to_le32(task->total_xfer_len);

    /*
     * arrange MVS_SLOT_BUF_SZ-sized DMA buffer according to our needs
     */

    /* region 1: command table area (MVS_SSP_CMD_SZ bytes) ************** */
    buf_cmd = buf_tmp = slot->buf;
    buf_tmp_dma = slot->buf_dma;

    hdr->cmd_tbl = cpu_to_le64(buf_tmp_dma);

    buf_tmp += MVS_SSP_CMD_SZ;
    buf_tmp_dma += MVS_SSP_CMD_SZ;

    /* region 2: open address frame area (MVS_OAF_SZ bytes) ********* */
    buf_oaf = buf_tmp;
    hdr->open_frame = cpu_to_le64(buf_tmp_dma);

    buf_tmp += MVS_OAF_SZ;
    buf_tmp_dma += MVS_OAF_SZ;

    /* region 3: PRD table ********************************************* */
    buf_prd = buf_tmp;
    if (tei->n_elem)
        hdr->prd_tbl = cpu_to_le64(buf_tmp_dma);
    else
        hdr->prd_tbl = 0;

    i = MVS_CHIP_DISP->prd_size() * tei->n_elem;
    buf_tmp += i;
    buf_tmp_dma += i;

    /* region 4: status buffer (larger the PRD, smaller this buf) ****** */
    slot->response = buf_tmp;
    hdr->status_buf = cpu_to_le64(buf_tmp_dma);
    if (mvi->flags & MVF_FLAG_SOC)
        hdr->reserved[0] = 0;

    resp_len = MVS_SLOT_BUF_SZ - MVS_SSP_CMD_SZ - MVS_OAF_SZ -
        sizeof(struct mvs_err_info) - i;
    resp_len = min(resp_len, max_resp_len);

    req_len = sizeof(struct ssp_frame_hdr) + 28;

    /* request, response lengths */
    hdr->lens = cpu_to_le32(((resp_len / 4) << 16) | (req_len / 4));

    /* generate open address frame hdr (first 12 bytes) */
    /* initiator, SSP, ftype 1h */
    buf_oaf[0] = (1 << 7) | (PROTOCOL_SSP << 4) | 0x1;
    buf_oaf[1] = min(sas_port->linkrate, dev->linkrate) & 0xf;
    *(u16 *)(buf_oaf + 2) = cpu_to_be16(mvi_dev->device_id + 1);
    memcpy(buf_oaf + 4, dev->sas_addr, SAS_ADDR_SIZE);

    /* fill in SSP frame header (Command Table.SSP frame header) */
    ssp_hdr = (struct ssp_frame_hdr *)buf_cmd;

    if (is_tmf)
        ssp_hdr->frame_type = SSP_TASK;
    else
        ssp_hdr->frame_type = SSP_COMMAND;

    memcpy(ssp_hdr->hashed_dest_addr, dev->hashed_sas_addr,
           HASHED_SAS_ADDR_SIZE);
    memcpy(ssp_hdr->hashed_src_addr,
           dev->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
    ssp_hdr->tag = cpu_to_be16(tag);

    /* fill in IU for TASK and Command Frame */
    buf_cmd += sizeof(*ssp_hdr);
    memcpy(buf_cmd, &task->ssp_task.LUN, 8);

    if (ssp_hdr->frame_type != SSP_TASK) {
        buf_cmd[9] = fburst | task->ssp_task.task_attr |
                (task->ssp_task.task_prio << 3);
        memcpy(buf_cmd + 12, &task->ssp_task.cdb, 16);
    } else{
        buf_cmd[10] = tmf->tmf;
        switch (tmf->tmf) {
        case TMF_ABORT_TASK:
        case TMF_QUERY_TASK:
            buf_cmd[12] =
                (tmf->tag_of_task_to_be_managed >> 8) & 0xff;
            buf_cmd[13] =
                tmf->tag_of_task_to_be_managed & 0xff;
            break;
        default:
            break;
        }
    }
    /* fill in PRD (scatter/gather) table, if any */
    MVS_CHIP_DISP->make_prd(task->scatter, tei->n_elem, buf_prd);
    return 0;
}

#define DEV_IS_GONE(mvi_dev)    ((!mvi_dev || (mvi_dev->dev_type == NO_DEVICE)))
static int mvs_task_prep(struct sas_task *task, struct mvs_info *mvi, int is_tmf,
                struct mvs_tmf_task *tmf, int *pass)
{
    struct domain_device *dev = task->dev;
    struct mvs_device *mvi_dev = dev->lldd_dev;
    struct mvs_task_exec_info tei;
    struct mvs_slot_info *slot;
    u32 tag = 0xdeadbeef, n_elem = 0;
    int rc = 0;

    if (!dev->port) {
        struct task_status_struct *tsm = &task->task_status;

        tsm->resp = SAS_TASK_UNDELIVERED;
        tsm->stat = SAS_PHY_DOWN;
        /*
         * libsas will use dev->port, should
         * not call task_done for sata
         */
        if (dev->dev_type != SATA_DEV)
            task->task_done(task);
        return rc;
    }

    if (DEV_IS_GONE(mvi_dev)) {
        if (mvi_dev)
            mv_dprintk("device %d not ready.\n",
                mvi_dev->device_id);
        else
            mv_dprintk("device %016llx not ready.\n",
                SAS_ADDR(dev->sas_addr));

            rc = SAS_PHY_DOWN;
            return rc;
    }
    tei.port = dev->port->lldd_port;
    if (tei.port && !tei.port->port_attached && !tmf) {
        if (sas_protocol_ata(task->task_proto)) {
            struct task_status_struct *ts = &task->task_status;
            mv_dprintk("SATA/STP port %d does not attach"
                    "device.\n", dev->port->id);
            ts->resp = SAS_TASK_COMPLETE;
            ts->stat = SAS_PHY_DOWN;

            task->task_done(task);

        } else {
            struct task_status_struct *ts = &task->task_status;
            mv_dprintk("SAS port %d does not attach"
                "device.\n", dev->port->id);
            ts->resp = SAS_TASK_UNDELIVERED;
            ts->stat = SAS_PHY_DOWN;
            task->task_done(task);
        }
        return rc;
    }

    if (!sas_protocol_ata(task->task_proto)) {
        if (task->num_scatter) {
            n_elem = dma_map_sg(mvi->dev,
                        task->scatter,
                        task->num_scatter,
                        task->data_dir);
            if (!n_elem) {
                rc = -ENOMEM;
                goto prep_out;
            }
        }
    } else {
        n_elem = task->num_scatter;
    }

    rc = mvs_tag_alloc(mvi, &tag);
    if (rc)
        goto err_out;

    slot = &mvi->slot_info[tag];

    task->lldd_task = NULL;
    slot->n_elem = n_elem;
    slot->slot_tag = tag;

    slot->buf = pci_pool_alloc(mvi->dma_pool, GFP_ATOMIC, &slot->buf_dma);
    if (!slot->buf)
        goto err_out_tag;
    memset(slot->buf, 0, MVS_SLOT_BUF_SZ);

    tei.task = task;
    tei.hdr = &mvi->slot[tag];
    tei.tag = tag;
    tei.n_elem = n_elem;
    switch (task->task_proto) {
    case SAS_PROTOCOL_SMP:
        rc = mvs_task_prep_smp(mvi, &tei);
        break;
    case SAS_PROTOCOL_SSP:
        rc = mvs_task_prep_ssp(mvi, &tei, is_tmf, tmf);
        break;
    case SAS_PROTOCOL_SATA:
    case SAS_PROTOCOL_STP:
    case SAS_PROTOCOL_SATA | SAS_PROTOCOL_STP:
        rc = mvs_task_prep_ata(mvi, &tei);
        break;
    default:
        dev_printk(KERN_ERR, mvi->dev,
            "unknown sas_task proto: 0x%x\n",
            task->task_proto);
        rc = -EINVAL;
        break;
    }

    if (rc) {
        mv_dprintk("rc is %x\n", rc);
        goto err_out_slot_buf;
    }
    slot->task = task;
    slot->port = tei.port;
    task->lldd_task = slot;
    list_add_tail(&slot->entry, &tei.port->list);
    spin_lock(&task->task_state_lock);
    task->task_state_flags |= SAS_TASK_AT_INITIATOR;
    spin_unlock(&task->task_state_lock);

    mvi_dev->running_req++;
    ++(*pass);
    mvi->tx_prod = (mvi->tx_prod + 1) & (MVS_CHIP_SLOT_SZ - 1);

    return rc;

err_out_slot_buf:
    pci_pool_free(mvi->dma_pool, slot->buf, slot->buf_dma);
err_out_tag:
    mvs_tag_free(mvi, tag);
err_out:

    dev_printk(KERN_ERR, mvi->dev, "mvsas prep failed[%d]!\n", rc);
    if (!sas_protocol_ata(task->task_proto))
        if (n_elem)
            dma_unmap_sg(mvi->dev, task->scatter, n_elem,
                     task->data_dir);
prep_out:
    return rc;
}

static struct mvs_task_list *mvs_task_alloc_list(int *num, gfp_t gfp_flags)
{
    struct mvs_task_list *first = NULL;

    for (; *num > 0; --*num) {
        struct mvs_task_list *mvs_list = kmem_cache_zalloc(mvs_task_list_cache, gfp_flags);

        if (!mvs_list)
            break;

        INIT_LIST_HEAD(&mvs_list->list);
        if (!first)
            first = mvs_list;
        else
            list_add_tail(&mvs_list->list, &first->list);

    }

    return first;
}

static inline void mvs_task_free_list(struct mvs_task_list *mvs_list)
{
    LIST_HEAD(list);
    struct list_head *pos, *a;
    struct mvs_task_list *mlist = NULL;

    __list_add(&list, mvs_list->list.prev, &mvs_list->list);

    list_for_each_safe(pos, a, &list) {
        list_del_init(pos);
        mlist = list_entry(pos, struct mvs_task_list, list);
        kmem_cache_free(mvs_task_list_cache, mlist);
    }
}

static int mvs_task_exec(struct sas_task *task, const int num, gfp_t gfp_flags,
                struct completion *completion, int is_tmf,
                struct mvs_tmf_task *tmf)
{
    struct mvs_info *mvi = NULL;
    u32 rc = 0;
    u32 pass = 0;
    unsigned long flags = 0;

    mvi = ((struct mvs_device *)task->dev->lldd_dev)->mvi_info;

    spin_lock_irqsave(&mvi->lock, flags);
    rc = mvs_task_prep(task, mvi, is_tmf, tmf, &pass);
    if (rc)
        dev_printk(KERN_ERR, mvi->dev, "mvsas exec failed[%d]!\n", rc);

    if (likely(pass))
            MVS_CHIP_DISP->start_delivery(mvi, (mvi->tx_prod - 1) &
                (MVS_CHIP_SLOT_SZ - 1));
    spin_unlock_irqrestore(&mvi->lock, flags);

    return rc;
}

static int mvs_collector_task_exec(struct sas_task *task, const int num, gfp_t gfp_flags,
                struct completion *completion, int is_tmf,
                struct mvs_tmf_task *tmf)
{
    struct domain_device *dev = task->dev;
    struct mvs_prv_info *mpi = dev->port->ha->lldd_ha;
    struct mvs_info *mvi = NULL;
    struct sas_task *t = task;
    struct mvs_task_list *mvs_list = NULL, *a;
    LIST_HEAD(q);
    int pass[2] = {0};
    u32 rc = 0;
    u32 n = num;
    unsigned long flags = 0;

    mvs_list = mvs_task_alloc_list(&n, gfp_flags);
    if (n) {
        printk(KERN_ERR "%s: mvs alloc list failed.\n", __func__);
        rc = -ENOMEM;
        goto free_list;
    }

    __list_add(&q, mvs_list->list.prev, &mvs_list->list);

    list_for_each_entry(a, &q, list) {
        a->task = t;
        t = list_entry(t->list.next, struct sas_task, list);
    }

    list_for_each_entry(a, &q , list) {

        t = a->task;
        mvi = ((struct mvs_device *)t->dev->lldd_dev)->mvi_info;

        spin_lock_irqsave(&mvi->lock, flags);
        rc = mvs_task_prep(t, mvi, is_tmf, tmf, &pass[mvi->id]);
        if (rc)
            dev_printk(KERN_ERR, mvi->dev, "mvsas exec failed[%d]!\n", rc);
        spin_unlock_irqrestore(&mvi->lock, flags);
    }

    if (likely(pass[0]))
            MVS_CHIP_DISP->start_delivery(mpi->mvi[0],
                (mpi->mvi[0]->tx_prod - 1) & (MVS_CHIP_SLOT_SZ - 1));

    if (likely(pass[1]))
            MVS_CHIP_DISP->start_delivery(mpi->mvi[1],
                (mpi->mvi[1]->tx_prod - 1) & (MVS_CHIP_SLOT_SZ - 1));

    list_del_init(&q);

free_list:
    if (mvs_list)
        mvs_task_free_list(mvs_list);

    return rc;
}

int mvs_queue_command(struct sas_task *task, const int num,
            gfp_t gfp_flags)
{
    struct mvs_device *mvi_dev = task->dev->lldd_dev;
    struct sas_ha_struct *sas = mvi_dev->mvi_info->sas;

    if (sas->lldd_max_execute_num < 2)
        return mvs_task_exec(task, num, gfp_flags, NULL, 0, NULL);
    else
        return mvs_collector_task_exec(task, num, gfp_flags, NULL, 0, NULL);
}

static void mvs_slot_free(struct mvs_info *mvi, u32 rx_desc)
{
    u32 slot_idx = rx_desc & RXQ_SLOT_MASK;
    mvs_tag_clear(mvi, slot_idx);
}

static void mvs_slot_task_free(struct mvs_info *mvi, struct sas_task *task,
              struct mvs_slot_info *slot, u32 slot_idx)
{
    if (!slot->task)
        return;
    if (!sas_protocol_ata(task->task_proto))
        if (slot->n_elem)
            dma_unmap_sg(mvi->dev, task->scatter,
                     slot->n_elem, task->data_dir);

    switch (task->task_proto) {
    case SAS_PROTOCOL_SMP:
        dma_unmap_sg(mvi->dev, &task->smp_task.smp_resp, 1,
                 PCI_DMA_FROMDEVICE);
        dma_unmap_sg(mvi->dev, &task->smp_task.smp_req, 1,
                 PCI_DMA_TODEVICE);
        break;

    case SAS_PROTOCOL_SATA:
    case SAS_PROTOCOL_STP:
    case SAS_PROTOCOL_SSP:
    default:
        /* do nothing */
        break;
    }

    if (slot->buf) {
        pci_pool_free(mvi->dma_pool, slot->buf, slot->buf_dma);
        slot->buf = NULL;
    }
    list_del_init(&slot->entry);
    task->lldd_task = NULL;
    slot->task = NULL;
    slot->port = NULL;
    slot->slot_tag = 0xFFFFFFFF;
    mvs_slot_free(mvi, slot_idx);
}

static void mvs_update_wideport(struct mvs_info *mvi, int phy_no)
{
    struct mvs_phy *phy = &mvi->phy[phy_no];
    struct mvs_port *port = phy->port;
    int j, no;

    for_each_phy(port->wide_port_phymap, j, no) {
        if (j & 1) {
            MVS_CHIP_DISP->write_port_cfg_addr(mvi, no,
                        PHYR_WIDE_PORT);
            MVS_CHIP_DISP->write_port_cfg_data(mvi, no,
                        port->wide_port_phymap);
        } else {
            MVS_CHIP_DISP->write_port_cfg_addr(mvi, no,
                        PHYR_WIDE_PORT);
            MVS_CHIP_DISP->write_port_cfg_data(mvi, no,
                        0);
        }
    }
}

static u32 mvs_is_phy_ready(struct mvs_info *mvi, int i)
{
    u32 tmp;
    struct mvs_phy *phy = &mvi->phy[i];
    struct mvs_port *port = phy->port;

    tmp = MVS_CHIP_DISP->read_phy_ctl(mvi, i);
    if ((tmp & PHY_READY_MASK) && !(phy->irq_status & PHYEV_POOF)) {
        if (!port)
            phy->phy_attached = 1;
        return tmp;
    }

    if (port) {
        if (phy->phy_type & PORT_TYPE_SAS) {
            port->wide_port_phymap &= ~(1U << i);
            if (!port->wide_port_phymap)
                port->port_attached = 0;
            mvs_update_wideport(mvi, i);
        } else if (phy->phy_type & PORT_TYPE_SATA)
            port->port_attached = 0;
        phy->port = NULL;
        phy->phy_attached = 0;
        phy->phy_type &= ~(PORT_TYPE_SAS | PORT_TYPE_SATA);
    }
    return 0;
}

static void *mvs_get_d2h_reg(struct mvs_info *mvi, int i, void *buf)
{
    u32 *s = (u32 *) buf;

    if (!s)
        return NULL;

    MVS_CHIP_DISP->write_port_cfg_addr(mvi, i, PHYR_SATA_SIG3);
    s[3] = cpu_to_le32(MVS_CHIP_DISP->read_port_cfg_data(mvi, i));

    MVS_CHIP_DISP->write_port_cfg_addr(mvi, i, PHYR_SATA_SIG2);
    s[2] = cpu_to_le32(MVS_CHIP_DISP->read_port_cfg_data(mvi, i));

    MVS_CHIP_DISP->write_port_cfg_addr(mvi, i, PHYR_SATA_SIG1);
    s[1] = cpu_to_le32(MVS_CHIP_DISP->read_port_cfg_data(mvi, i));

    MVS_CHIP_DISP->write_port_cfg_addr(mvi, i, PHYR_SATA_SIG0);
    s[0] = cpu_to_le32(MVS_CHIP_DISP->read_port_cfg_data(mvi, i));

    if (((s[1] & 0x00FFFFFF) == 0x00EB1401) && (*(u8 *)&s[3] == 0x01))
        s[1] = 0x00EB1401 | (*((u8 *)&s[1] + 3) & 0x10);

    return s;
}

static u32 mvs_is_sig_fis_received(u32 irq_status)
{
    return irq_status & PHYEV_SIG_FIS;
}

static void mvs_sig_remove_timer(struct mvs_phy *phy)
{
    if (phy->timer.function)
        del_timer(&phy->timer);
    phy->timer.function = NULL;
}

void mvs_update_phyinfo(struct mvs_info *mvi, int i, int get_st)
{
    struct mvs_phy *phy = &mvi->phy[i];
    struct sas_identify_frame *id;

    id = (struct sas_identify_frame *)phy->frame_rcvd;

    if (get_st) {
        phy->irq_status = MVS_CHIP_DISP->read_port_irq_stat(mvi, i);
        phy->phy_status = mvs_is_phy_ready(mvi, i);
    }

    if (phy->phy_status) {
        int oob_done = 0;
        struct asd_sas_phy *sas_phy = &mvi->phy[i].sas_phy;

        oob_done = MVS_CHIP_DISP->oob_done(mvi, i);

        MVS_CHIP_DISP->fix_phy_info(mvi, i, id);
        if (phy->phy_type & PORT_TYPE_SATA) {
            phy->identify.target_port_protocols = SAS_PROTOCOL_STP;
            if (mvs_is_sig_fis_received(phy->irq_status)) {
                mvs_sig_remove_timer(phy);
                phy->phy_attached = 1;
                phy->att_dev_sas_addr =
                    i + mvi->id * mvi->chip->n_phy;
                if (oob_done)
                    sas_phy->oob_mode = SATA_OOB_MODE;
                phy->frame_rcvd_size =
                    sizeof(struct dev_to_host_fis);
                mvs_get_d2h_reg(mvi, i, id);
            } else {
                u32 tmp;
                dev_printk(KERN_DEBUG, mvi->dev,
                    "Phy%d : No sig fis\n", i);
                tmp = MVS_CHIP_DISP->read_port_irq_mask(mvi, i);
                MVS_CHIP_DISP->write_port_irq_mask(mvi, i,
                        tmp | PHYEV_SIG_FIS);
                phy->phy_attached = 0;
                phy->phy_type &= ~PORT_TYPE_SATA;
                goto out_done;
            }
        }   else if (phy->phy_type & PORT_TYPE_SAS
            || phy->att_dev_info & PORT_SSP_INIT_MASK) {
            phy->phy_attached = 1;
            phy->identify.device_type =
                phy->att_dev_info & PORT_DEV_TYPE_MASK;

            if (phy->identify.device_type == SAS_END_DEV)
                phy->identify.target_port_protocols =
                            SAS_PROTOCOL_SSP;
            else if (phy->identify.device_type != NO_DEVICE)
                phy->identify.target_port_protocols =
                            SAS_PROTOCOL_SMP;
            if (oob_done)
                sas_phy->oob_mode = SAS_OOB_MODE;
            phy->frame_rcvd_size =
                sizeof(struct sas_identify_frame);
        }
        memcpy(sas_phy->attached_sas_addr,
            &phy->att_dev_sas_addr, SAS_ADDR_SIZE);

        if (MVS_CHIP_DISP->phy_work_around)
            MVS_CHIP_DISP->phy_work_around(mvi, i);
    }
    mv_dprintk("phy %d attach dev info is %x\n",
        i + mvi->id * mvi->chip->n_phy, phy->att_dev_info);
    mv_dprintk("phy %d attach sas addr is %llx\n",
        i + mvi->id * mvi->chip->n_phy, phy->att_dev_sas_addr);
out_done:
    if (get_st)
        MVS_CHIP_DISP->write_port_irq_stat(mvi, i, phy->irq_status);
}

static void mvs_port_notify_formed(struct asd_sas_phy *sas_phy, int lock)
{
    struct sas_ha_struct *sas_ha = sas_phy->ha;
    struct mvs_info *mvi = NULL; int i = 0, hi;
    struct mvs_phy *phy = sas_phy->lldd_phy;
    struct asd_sas_port *sas_port = sas_phy->port;
    struct mvs_port *port;
    unsigned long flags = 0;
    if (!sas_port)
        return;

    while (sas_ha->sas_phy[i]) {
        if (sas_ha->sas_phy[i] == sas_phy)
            break;
        i++;
    }
    hi = i/((struct mvs_prv_info *)sas_ha->lldd_ha)->n_phy;
    mvi = ((struct mvs_prv_info *)sas_ha->lldd_ha)->mvi[hi];
    if (i >= mvi->chip->n_phy)
        port = &mvi->port[i - mvi->chip->n_phy];
    else
        port = &mvi->port[i];
    if (lock)
        spin_lock_irqsave(&mvi->lock, flags);
    port->port_attached = 1;
    phy->port = port;
    sas_port->lldd_port = port;
    if (phy->phy_type & PORT_TYPE_SAS) {
        port->wide_port_phymap = sas_port->phy_mask;
        mv_printk("set wide port phy map %x\n", sas_port->phy_mask);
        mvs_update_wideport(mvi, sas_phy->id);

        /* direct attached SAS device */
        if (phy->att_dev_info & PORT_SSP_TRGT_MASK) {
            MVS_CHIP_DISP->write_port_cfg_addr(mvi, i, PHYR_PHY_STAT);
            MVS_CHIP_DISP->write_port_cfg_data(mvi, i, 0x04);
        }
    }
    if (lock)
        spin_unlock_irqrestore(&mvi->lock, flags);
}

static void mvs_port_notify_deformed(struct asd_sas_phy *sas_phy, int lock)
{
    struct domain_device *dev;
    struct mvs_phy *phy = sas_phy->lldd_phy;
    struct mvs_info *mvi = phy->mvi;
    struct asd_sas_port *port = sas_phy->port;
    int phy_no = 0;

    while (phy != &mvi->phy[phy_no]) {
        phy_no++;
        if (phy_no >= MVS_MAX_PHYS)
            return;
    }
    list_for_each_entry(dev, &port->dev_list, dev_list_node)
        mvs_do_release_task(phy->mvi, phy_no, dev);

}


void mvs_port_formed(struct asd_sas_phy *sas_phy)
{
    mvs_port_notify_formed(sas_phy, 1);
}

void mvs_port_deformed(struct asd_sas_phy *sas_phy)
{
    mvs_port_notify_deformed(sas_phy, 1);
}

struct mvs_device *mvs_alloc_dev(struct mvs_info *mvi)
{
    u32 dev;
    for (dev = 0; dev < MVS_MAX_DEVICES; dev++) {
        if (mvi->devices[dev].dev_type == NO_DEVICE) {
            mvi->devices[dev].device_id = dev;
            return &mvi->devices[dev];
        }
    }

    if (dev == MVS_MAX_DEVICES)
        mv_printk("max support %d devices, ignore ..\n",
            MVS_MAX_DEVICES);

    return NULL;
}

void mvs_free_dev(struct mvs_device *mvi_dev)
{
    u32 id = mvi_dev->device_id;
    memset(mvi_dev, 0, sizeof(*mvi_dev));
    mvi_dev->device_id = id;
    mvi_dev->dev_type = NO_DEVICE;
    mvi_dev->dev_status = MVS_DEV_NORMAL;
    mvi_dev->taskfileset = MVS_ID_NOT_MAPPED;
}

int mvs_dev_found_notify(struct domain_device *dev, int lock)
{
    unsigned long flags = 0;
    int res = 0;
    struct mvs_info *mvi = NULL;
    struct domain_device *parent_dev = dev->parent;
    struct mvs_device *mvi_device;

    mvi = mvs_find_dev_mvi(dev);

    if (lock)
        spin_lock_irqsave(&mvi->lock, flags);

    mvi_device = mvs_alloc_dev(mvi);
    if (!mvi_device) {
        res = -1;
        goto found_out;
    }
    dev->lldd_dev = mvi_device;
    mvi_device->dev_status = MVS_DEV_NORMAL;
    mvi_device->dev_type = dev->dev_type;
    mvi_device->mvi_info = mvi;
    mvi_device->sas_device = dev;
    if (parent_dev && DEV_IS_EXPANDER(parent_dev->dev_type)) {
        int phy_id;
        u8 phy_num = parent_dev->ex_dev.num_phys;
        struct ex_phy *phy;
        for (phy_id = 0; phy_id < phy_num; phy_id++) {
            phy = &parent_dev->ex_dev.ex_phy[phy_id];
            if (SAS_ADDR(phy->attached_sas_addr) ==
                SAS_ADDR(dev->sas_addr)) {
                mvi_device->attached_phy = phy_id;
                break;
            }
        }

        if (phy_id == phy_num) {
            mv_printk("Error: no attached dev:%016llx"
                "at ex:%016llx.\n",
                SAS_ADDR(dev->sas_addr),
                SAS_ADDR(parent_dev->sas_addr));
            res = -1;
        }
    }

found_out:
    if (lock)
        spin_unlock_irqrestore(&mvi->lock, flags);
    return res;
}

int mvs_dev_found(struct domain_device *dev)
{
    return mvs_dev_found_notify(dev, 1);
}

void mvs_dev_gone_notify(struct domain_device *dev)
{
    unsigned long flags = 0;
    struct mvs_device *mvi_dev = dev->lldd_dev;
    struct mvs_info *mvi = mvi_dev->mvi_info;

    spin_lock_irqsave(&mvi->lock, flags);

    if (mvi_dev) {
        mv_dprintk("found dev[%d:%x] is gone.\n",
            mvi_dev->device_id, mvi_dev->dev_type);
        mvs_release_task(mvi, dev);
        mvs_free_reg_set(mvi, mvi_dev);
        mvs_free_dev(mvi_dev);
    } else {
        mv_dprintk("found dev has gone.\n");
    }
    dev->lldd_dev = NULL;
    mvi_dev->sas_device = NULL;

    spin_unlock_irqrestore(&mvi->lock, flags);
}


void mvs_dev_gone(struct domain_device *dev)
{
    mvs_dev_gone_notify(dev);
}

static void mvs_task_done(struct sas_task *task)
{
    if (!del_timer(&task->slow_task->timer))
        return;
    complete(&task->slow_task->completion);
}

static void mvs_tmf_timedout(unsigned long data)
{
    struct sas_task *task = (struct sas_task *)data;

    task->task_state_flags |= SAS_TASK_STATE_ABORTED;
    complete(&task->slow_task->completion);
}

#define MVS_TASK_TIMEOUT 20
static int mvs_exec_internal_tmf_task(struct domain_device *dev,
            void *parameter, u32 para_len, struct mvs_tmf_task *tmf)
{
    int res, retry;
    struct sas_task *task = NULL;

    for (retry = 0; retry < 3; retry++) {
        task = sas_alloc_slow_task(GFP_KERNEL);
        if (!task)
            return -ENOMEM;

        task->dev = dev;
        task->task_proto = dev->tproto;

        memcpy(&task->ssp_task, parameter, para_len);
        task->task_done = mvs_task_done;

        task->slow_task->timer.data = (unsigned long) task;
        task->slow_task->timer.function = mvs_tmf_timedout;
        task->slow_task->timer.expires = jiffies + MVS_TASK_TIMEOUT*HZ;
        add_timer(&task->slow_task->timer);

        res = mvs_task_exec(task, 1, GFP_KERNEL, NULL, 1, tmf);

        if (res) {
            del_timer(&task->slow_task->timer);
            mv_printk("executing internel task failed:%d\n", res);
            goto ex_err;
        }

        wait_for_completion(&task->slow_task->completion);
        res = TMF_RESP_FUNC_FAILED;
        /* Even TMF timed out, return direct. */
        if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
            if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
                mv_printk("TMF task[%x] timeout.\n", tmf->tmf);
                goto ex_err;
            }
        }

        if (task->task_status.resp == SAS_TASK_COMPLETE &&
            task->task_status.stat == SAM_STAT_GOOD) {
            res = TMF_RESP_FUNC_COMPLETE;
            break;
        }

        if (task->task_status.resp == SAS_TASK_COMPLETE &&
              task->task_status.stat == SAS_DATA_UNDERRUN) {
            /* no error, but return the number of bytes of
             * underrun */
            res = task->task_status.residual;
            break;
        }

        if (task->task_status.resp == SAS_TASK_COMPLETE &&
              task->task_status.stat == SAS_DATA_OVERRUN) {
            mv_dprintk("blocked task error.\n");
            res = -EMSGSIZE;
            break;
        } else {
            mv_dprintk(" task to dev %016llx response: 0x%x "
                    "status 0x%x\n",
                    SAS_ADDR(dev->sas_addr),
                    task->task_status.resp,
                    task->task_status.stat);
            sas_free_task(task);
            task = NULL;

        }
    }
ex_err:
    BUG_ON(retry == 3 && task != NULL);
    sas_free_task(task);
    return res;
}

static int mvs_debug_issue_ssp_tmf(struct domain_device *dev,
                u8 *lun, struct mvs_tmf_task *tmf)
{
    struct sas_ssp_task ssp_task;
    if (!(dev->tproto & SAS_PROTOCOL_SSP))
        return TMF_RESP_FUNC_ESUPP;

    memcpy(ssp_task.LUN, lun, 8);

    return mvs_exec_internal_tmf_task(dev, &ssp_task,
                sizeof(ssp_task), tmf);
}


/*  Standard mandates link reset for ATA  (type 0)
    and hard reset for SSP (type 1) , only for RECOVERY */
static int mvs_debug_I_T_nexus_reset(struct domain_device *dev)
{
    int rc;
    struct sas_phy *phy = sas_get_local_phy(dev);
    int reset_type = (dev->dev_type == SATA_DEV ||
            (dev->tproto & SAS_PROTOCOL_STP)) ? 0 : 1;
    rc = sas_phy_reset(phy, reset_type);
    sas_put_local_phy(phy);
    msleep(2000);
    return rc;
}

/* mandatory SAM-3 */
int mvs_lu_reset(struct domain_device *dev, u8 *lun)
{
    unsigned long flags;
    int rc = TMF_RESP_FUNC_FAILED;
    struct mvs_tmf_task tmf_task;
    struct mvs_device * mvi_dev = dev->lldd_dev;
    struct mvs_info *mvi = mvi_dev->mvi_info;

    tmf_task.tmf = TMF_LU_RESET;
    mvi_dev->dev_status = MVS_DEV_EH;
    rc = mvs_debug_issue_ssp_tmf(dev, lun, &tmf_task);
    if (rc == TMF_RESP_FUNC_COMPLETE) {
        spin_lock_irqsave(&mvi->lock, flags);
        mvs_release_task(mvi, dev);
        spin_unlock_irqrestore(&mvi->lock, flags);
    }
    /* If failed, fall-through I_T_Nexus reset */
    mv_printk("%s for device[%x]:rc= %d\n", __func__,
            mvi_dev->device_id, rc);
    return rc;
}

int mvs_I_T_nexus_reset(struct domain_device *dev)
{
    unsigned long flags;
    int rc = TMF_RESP_FUNC_FAILED;
    struct mvs_device * mvi_dev = (struct mvs_device *)dev->lldd_dev;
    struct mvs_info *mvi = mvi_dev->mvi_info;

    if (mvi_dev->dev_status != MVS_DEV_EH)
        return TMF_RESP_FUNC_COMPLETE;
    else
        mvi_dev->dev_status = MVS_DEV_NORMAL;
    rc = mvs_debug_I_T_nexus_reset(dev);
    mv_printk("%s for device[%x]:rc= %d\n",
        __func__, mvi_dev->device_id, rc);

    spin_lock_irqsave(&mvi->lock, flags);
    mvs_release_task(mvi, dev);
    spin_unlock_irqrestore(&mvi->lock, flags);

    return rc;
}
/* optional SAM-3 */
int mvs_query_task(struct sas_task *task)
{
    u32 tag;
    struct scsi_lun lun;
    struct mvs_tmf_task tmf_task;
    int rc = TMF_RESP_FUNC_FAILED;

    if (task->lldd_task && task->task_proto & SAS_PROTOCOL_SSP) {
        struct scsi_cmnd * cmnd = (struct scsi_cmnd *)task->uldd_task;
        struct domain_device *dev = task->dev;
        struct mvs_device *mvi_dev = (struct mvs_device *)dev->lldd_dev;
        struct mvs_info *mvi = mvi_dev->mvi_info;

        int_to_scsilun(cmnd->device->lun, &lun);
        rc = mvs_find_tag(mvi, task, &tag);
        if (rc == 0) {
            rc = TMF_RESP_FUNC_FAILED;
            return rc;
        }

        tmf_task.tmf = TMF_QUERY_TASK;
        tmf_task.tag_of_task_to_be_managed = cpu_to_le16(tag);

        rc = mvs_debug_issue_ssp_tmf(dev, lun.scsi_lun, &tmf_task);
        switch (rc) {
        /* The task is still in Lun, release it then */
        case TMF_RESP_FUNC_SUCC:
        /* The task is not in Lun or failed, reset the phy */
        case TMF_RESP_FUNC_FAILED:
        case TMF_RESP_FUNC_COMPLETE:
            break;
        }
    }
    mv_printk("%s:rc= %d\n", __func__, rc);
    return rc;
}

/*  mandatory SAM-3, still need free task/slot info */
int mvs_abort_task(struct sas_task *task)
{
    struct scsi_lun lun;
    struct mvs_tmf_task tmf_task;
    struct domain_device *dev = task->dev;
    struct mvs_device *mvi_dev = (struct mvs_device *)dev->lldd_dev;
    struct mvs_info *mvi;
    int rc = TMF_RESP_FUNC_FAILED;
    unsigned long flags;
    u32 tag;

    if (!mvi_dev) {
        mv_printk("Device has removed\n");
        return TMF_RESP_FUNC_FAILED;
    }

    mvi = mvi_dev->mvi_info;

    spin_lock_irqsave(&task->task_state_lock, flags);
    if (task->task_state_flags & SAS_TASK_STATE_DONE) {
        spin_unlock_irqrestore(&task->task_state_lock, flags);
        rc = TMF_RESP_FUNC_COMPLETE;
        goto out;
    }
    spin_unlock_irqrestore(&task->task_state_lock, flags);
    mvi_dev->dev_status = MVS_DEV_EH;
    if (task->lldd_task && task->task_proto & SAS_PROTOCOL_SSP) {
        struct scsi_cmnd * cmnd = (struct scsi_cmnd *)task->uldd_task;

        int_to_scsilun(cmnd->device->lun, &lun);
        rc = mvs_find_tag(mvi, task, &tag);
        if (rc == 0) {
            mv_printk("No such tag in %s\n", __func__);
            rc = TMF_RESP_FUNC_FAILED;
            return rc;
        }

        tmf_task.tmf = TMF_ABORT_TASK;
        tmf_task.tag_of_task_to_be_managed = cpu_to_le16(tag);

        rc = mvs_debug_issue_ssp_tmf(dev, lun.scsi_lun, &tmf_task);

        /* if successful, clear the task and callback forwards.*/
        if (rc == TMF_RESP_FUNC_COMPLETE) {
            u32 slot_no;
            struct mvs_slot_info *slot;

            if (task->lldd_task) {
                slot = task->lldd_task;
                slot_no = (u32) (slot - mvi->slot_info);
                spin_lock_irqsave(&mvi->lock, flags);
                mvs_slot_complete(mvi, slot_no, 1);
                spin_unlock_irqrestore(&mvi->lock, flags);
            }
        }

    } else if (task->task_proto & SAS_PROTOCOL_SATA ||
        task->task_proto & SAS_PROTOCOL_STP) {
        if (SATA_DEV == dev->dev_type) {
            struct mvs_slot_info *slot = task->lldd_task;
            u32 slot_idx = (u32)(slot - mvi->slot_info);
            mv_dprintk("mvs_abort_task() mvi=%p task=%p "
                   "slot=%p slot_idx=x%x\n",
                   mvi, task, slot, slot_idx);
            task->task_state_flags |= SAS_TASK_STATE_ABORTED;
            mvs_slot_task_free(mvi, task, slot, slot_idx);
            rc = TMF_RESP_FUNC_COMPLETE;
            goto out;
        }

    }
out:
    if (rc != TMF_RESP_FUNC_COMPLETE)
        mv_printk("%s:rc= %d\n", __func__, rc);
    return rc;
}

int mvs_abort_task_set(struct domain_device *dev, u8 *lun)
{
    int rc = TMF_RESP_FUNC_FAILED;
    struct mvs_tmf_task tmf_task;

    tmf_task.tmf = TMF_ABORT_TASK_SET;
    rc = mvs_debug_issue_ssp_tmf(dev, lun, &tmf_task);

    return rc;
}

int mvs_clear_aca(struct domain_device *dev, u8 *lun)
{
    int rc = TMF_RESP_FUNC_FAILED;
    struct mvs_tmf_task tmf_task;

    tmf_task.tmf = TMF_CLEAR_ACA;
    rc = mvs_debug_issue_ssp_tmf(dev, lun, &tmf_task);

    return rc;
}

int mvs_clear_task_set(struct domain_device *dev, u8 *lun)
{
    int rc = TMF_RESP_FUNC_FAILED;
    struct mvs_tmf_task tmf_task;

    tmf_task.tmf = TMF_CLEAR_TASK_SET;
    rc = mvs_debug_issue_ssp_tmf(dev, lun, &tmf_task);

    return rc;
}

static int mvs_sata_done(struct mvs_info *mvi, struct sas_task *task,
            u32 slot_idx, int err)
{
    struct mvs_device *mvi_dev = task->dev->lldd_dev;
    struct task_status_struct *tstat = &task->task_status;
    struct ata_task_resp *resp = (struct ata_task_resp *)tstat->buf;
    int stat = SAM_STAT_GOOD;


    resp->frame_len = sizeof(struct dev_to_host_fis);
    memcpy(&resp->ending_fis[0],
           SATA_RECEIVED_D2H_FIS(mvi_dev->taskfileset),
           sizeof(struct dev_to_host_fis));
    tstat->buf_valid_size = sizeof(*resp);
    if (unlikely(err)) {
        if (unlikely(err & CMD_ISS_STPD))
            stat = SAS_OPEN_REJECT;
        else
            stat = SAS_PROTO_RESPONSE;
       }

    return stat;
}

void mvs_set_sense(u8 *buffer, int len, int d_sense,
        int key, int asc, int ascq)
{
    memset(buffer, 0, len);

    if (d_sense) {
        /* Descriptor format */
        if (len < 4) {
            mv_printk("Length %d of sense buffer too small to "
                "fit sense %x:%x:%x", len, key, asc, ascq);
        }

        buffer[0] = 0x72;       /* Response Code    */
        if (len > 1)
            buffer[1] = key;    /* Sense Key */
        if (len > 2)
            buffer[2] = asc;    /* ASC  */
        if (len > 3)
            buffer[3] = ascq;   /* ASCQ */
    } else {
        if (len < 14) {
            mv_printk("Length %d of sense buffer too small to "
                "fit sense %x:%x:%x", len, key, asc, ascq);
        }

        buffer[0] = 0x70;       /* Response Code    */
        if (len > 2)
            buffer[2] = key;    /* Sense Key */
        if (len > 7)
            buffer[7] = 0x0a;   /* Additional Sense Length */
        if (len > 12)
            buffer[12] = asc;   /* ASC */
        if (len > 13)
            buffer[13] = ascq; /* ASCQ */
    }

    return;
}

void mvs_fill_ssp_resp_iu(struct ssp_response_iu *iu,
                u8 key, u8 asc, u8 asc_q)
{
    iu->datapres = 2;
    iu->response_data_len = 0;
    iu->sense_data_len = 17;
    iu->status = 02;
    mvs_set_sense(iu->sense_data, 17, 0,
            key, asc, asc_q);
}

static int mvs_slot_err(struct mvs_info *mvi, struct sas_task *task,
             u32 slot_idx)
{
    struct mvs_slot_info *slot = &mvi->slot_info[slot_idx];
    int stat;
    u32 err_dw0 = le32_to_cpu(*(u32 *)slot->response);
    u32 err_dw1 = le32_to_cpu(*((u32 *)slot->response + 1));
    u32 tfs = 0;
    enum mvs_port_type type = PORT_TYPE_SAS;

    if (err_dw0 & CMD_ISS_STPD)
        MVS_CHIP_DISP->issue_stop(mvi, type, tfs);

    MVS_CHIP_DISP->command_active(mvi, slot_idx);

    stat = SAM_STAT_CHECK_CONDITION;
    switch (task->task_proto) {
    case SAS_PROTOCOL_SSP:
    {
        stat = SAS_ABORTED_TASK;
        if ((err_dw0 & NO_DEST) || err_dw1 & bit(31)) {
            struct ssp_response_iu *iu = slot->response +
                sizeof(struct mvs_err_info);
            mvs_fill_ssp_resp_iu(iu, NOT_READY, 0x04, 01);
            sas_ssp_task_response(mvi->dev, task, iu);
            stat = SAM_STAT_CHECK_CONDITION;
        }
        if (err_dw1 & bit(31))
            mv_printk("reuse same slot, retry command.\n");
        break;
    }
    case SAS_PROTOCOL_SMP:
        stat = SAM_STAT_CHECK_CONDITION;
        break;

    case SAS_PROTOCOL_SATA:
    case SAS_PROTOCOL_STP:
    case SAS_PROTOCOL_SATA | SAS_PROTOCOL_STP:
    {
        task->ata_task.use_ncq = 0;
        stat = SAS_PROTO_RESPONSE;
        mvs_sata_done(mvi, task, slot_idx, err_dw0);
    }
        break;
    default:
        break;
    }

    return stat;
}

int mvs_slot_complete(struct mvs_info *mvi, u32 rx_desc, u32 flags)
{
    u32 slot_idx = rx_desc & RXQ_SLOT_MASK;
    struct mvs_slot_info *slot = &mvi->slot_info[slot_idx];
    struct sas_task *task = slot->task;
    struct mvs_device *mvi_dev = NULL;
    struct task_status_struct *tstat;
    struct domain_device *dev;
    u32 aborted;

    void *to;
    enum exec_status sts;

    if (unlikely(!task || !task->lldd_task || !task->dev))
        return -1;

    tstat = &task->task_status;
    dev = task->dev;
    mvi_dev = dev->lldd_dev;

    spin_lock(&task->task_state_lock);
    task->task_state_flags &=
        ~(SAS_TASK_STATE_PENDING | SAS_TASK_AT_INITIATOR);
    task->task_state_flags |= SAS_TASK_STATE_DONE;
    /* race condition*/
    aborted = task->task_state_flags & SAS_TASK_STATE_ABORTED;
    spin_unlock(&task->task_state_lock);

    memset(tstat, 0, sizeof(*tstat));
    tstat->resp = SAS_TASK_COMPLETE;

    if (unlikely(aborted)) {
        tstat->stat = SAS_ABORTED_TASK;
        if (mvi_dev && mvi_dev->running_req)
            mvi_dev->running_req--;
        if (sas_protocol_ata(task->task_proto))
            mvs_free_reg_set(mvi, mvi_dev);

        mvs_slot_task_free(mvi, task, slot, slot_idx);
        return -1;
    }

    /* when no device attaching, go ahead and complete by error handling*/
    if (unlikely(!mvi_dev || flags)) {
        if (!mvi_dev)
            mv_dprintk("port has not device.\n");
        tstat->stat = SAS_PHY_DOWN;
        goto out;
    }

    /* error info record present */
    if (unlikely((rx_desc & RXQ_ERR) && (*(u64 *) slot->response))) {
        mv_dprintk("port %d slot %d rx_desc %X has error info"
            "%016llX.\n", slot->port->sas_port.id, slot_idx,
             rx_desc, (u64)(*(u64 *)slot->response));
        tstat->stat = mvs_slot_err(mvi, task, slot_idx);
        tstat->resp = SAS_TASK_COMPLETE;
        goto out;
    }

    switch (task->task_proto) {
    case SAS_PROTOCOL_SSP:
        /* hw says status == 0, datapres == 0 */
        if (rx_desc & RXQ_GOOD) {
            tstat->stat = SAM_STAT_GOOD;
            tstat->resp = SAS_TASK_COMPLETE;
        }
        /* response frame present */
        else if (rx_desc & RXQ_RSP) {
            struct ssp_response_iu *iu = slot->response +
                        sizeof(struct mvs_err_info);
            sas_ssp_task_response(mvi->dev, task, iu);
        } else
            tstat->stat = SAM_STAT_CHECK_CONDITION;
        break;

    case SAS_PROTOCOL_SMP: {
            struct scatterlist *sg_resp = &task->smp_task.smp_resp;
            tstat->stat = SAM_STAT_GOOD;
            to = kmap_atomic(sg_page(sg_resp));
            memcpy(to + sg_resp->offset,
                slot->response + sizeof(struct mvs_err_info),
                sg_dma_len(sg_resp));
            kunmap_atomic(to);
            break;
        }

    case SAS_PROTOCOL_SATA:
    case SAS_PROTOCOL_STP:
    case SAS_PROTOCOL_SATA | SAS_PROTOCOL_STP: {
            tstat->stat = mvs_sata_done(mvi, task, slot_idx, 0);
            break;
        }

    default:
        tstat->stat = SAM_STAT_CHECK_CONDITION;
        break;
    }
    if (!slot->port->port_attached) {
        mv_dprintk("port %d has removed.\n", slot->port->sas_port.id);
        tstat->stat = SAS_PHY_DOWN;
    }


out:
    if (mvi_dev && mvi_dev->running_req) {
        mvi_dev->running_req--;
        if (sas_protocol_ata(task->task_proto) && !mvi_dev->running_req)
            mvs_free_reg_set(mvi, mvi_dev);
    }
    mvs_slot_task_free(mvi, task, slot, slot_idx);
    sts = tstat->stat;

    spin_unlock(&mvi->lock);
    if (task->task_done)
        task->task_done(task);

    spin_lock(&mvi->lock);

    return sts;
}

void mvs_do_release_task(struct mvs_info *mvi,
        int phy_no, struct domain_device *dev)
{
    u32 slot_idx;
    struct mvs_phy *phy;
    struct mvs_port *port;
    struct mvs_slot_info *slot, *slot2;

    phy = &mvi->phy[phy_no];
    port = phy->port;
    if (!port)
        return;
    /* clean cmpl queue in case request is already finished */
    mvs_int_rx(mvi, false);



    list_for_each_entry_safe(slot, slot2, &port->list, entry) {
        struct sas_task *task;
        slot_idx = (u32) (slot - mvi->slot_info);
        task = slot->task;

        if (dev && task->dev != dev)
            continue;

        mv_printk("Release slot [%x] tag[%x], task [%p]:\n",
            slot_idx, slot->slot_tag, task);
        MVS_CHIP_DISP->command_active(mvi, slot_idx);

        mvs_slot_complete(mvi, slot_idx, 1);
    }
}

void mvs_release_task(struct mvs_info *mvi,
              struct domain_device *dev)
{
    int i, phyno[WIDE_PORT_MAX_PHY], num;
    num = mvs_find_dev_phyno(dev, phyno);
    for (i = 0; i < num; i++)
        mvs_do_release_task(mvi, phyno[i], dev);
}

static void mvs_phy_disconnected(struct mvs_phy *phy)
{
    phy->phy_attached = 0;
    phy->att_dev_info = 0;
    phy->att_dev_sas_addr = 0;
}

static void mvs_work_queue(struct work_struct *work)
{
    struct delayed_work *dw = container_of(work, struct delayed_work, work);
    struct mvs_wq *mwq = container_of(dw, struct mvs_wq, work_q);
    struct mvs_info *mvi = mwq->mvi;
    unsigned long flags;
    u32 phy_no = (unsigned long) mwq->data;
    struct sas_ha_struct *sas_ha = mvi->sas;
    struct mvs_phy *phy = &mvi->phy[phy_no];
    struct asd_sas_phy *sas_phy = &phy->sas_phy;

    spin_lock_irqsave(&mvi->lock, flags);
    if (mwq->handler & PHY_PLUG_EVENT) {

        if (phy->phy_event & PHY_PLUG_OUT) {
            u32 tmp;
            struct sas_identify_frame *id;
            id = (struct sas_identify_frame *)phy->frame_rcvd;
            tmp = MVS_CHIP_DISP->read_phy_ctl(mvi, phy_no);
            phy->phy_event &= ~PHY_PLUG_OUT;
            if (!(tmp & PHY_READY_MASK)) {
                sas_phy_disconnected(sas_phy);
                mvs_phy_disconnected(phy);
                sas_ha->notify_phy_event(sas_phy,
                    PHYE_LOSS_OF_SIGNAL);
                mv_dprintk("phy%d Removed Device\n", phy_no);
            } else {
                MVS_CHIP_DISP->detect_porttype(mvi, phy_no);
                mvs_update_phyinfo(mvi, phy_no, 1);
                mvs_bytes_dmaed(mvi, phy_no);
                mvs_port_notify_formed(sas_phy, 0);
                mv_dprintk("phy%d Attached Device\n", phy_no);
            }
        }
    } else if (mwq->handler & EXP_BRCT_CHG) {
        phy->phy_event &= ~EXP_BRCT_CHG;
        sas_ha->notify_port_event(sas_phy,
                PORTE_BROADCAST_RCVD);
        mv_dprintk("phy%d Got Broadcast Change\n", phy_no);
    }
    list_del(&mwq->entry);
    spin_unlock_irqrestore(&mvi->lock, flags);
    kfree(mwq);
}

static int mvs_handle_event(struct mvs_info *mvi, void *data, int handler)
{
    struct mvs_wq *mwq;
    int ret = 0;

    mwq = kmalloc(sizeof(struct mvs_wq), GFP_ATOMIC);
    if (mwq) {
        mwq->mvi = mvi;
        mwq->data = data;
        mwq->handler = handler;
        MV_INIT_DELAYED_WORK(&mwq->work_q, mvs_work_queue, mwq);
        list_add_tail(&mwq->entry, &mvi->wq_list);
        schedule_delayed_work(&mwq->work_q, HZ * 2);
    } else
        ret = -ENOMEM;

    return ret;
}

static void mvs_sig_time_out(unsigned long tphy)
{
    struct mvs_phy *phy = (struct mvs_phy *)tphy;
    struct mvs_info *mvi = phy->mvi;
    u8 phy_no;

    for (phy_no = 0; phy_no < mvi->chip->n_phy; phy_no++) {
        if (&mvi->phy[phy_no] == phy) {
            mv_dprintk("Get signature time out, reset phy %d\n",
                phy_no+mvi->id*mvi->chip->n_phy);
            MVS_CHIP_DISP->phy_reset(mvi, phy_no, MVS_HARD_RESET);
        }
    }
}

void mvs_int_port(struct mvs_info *mvi, int phy_no, u32 events)
{
    u32 tmp;
    struct mvs_phy *phy = &mvi->phy[phy_no];

    phy->irq_status = MVS_CHIP_DISP->read_port_irq_stat(mvi, phy_no);
    MVS_CHIP_DISP->write_port_irq_stat(mvi, phy_no, phy->irq_status);
    mv_dprintk("phy %d ctrl sts=0x%08X.\n", phy_no+mvi->id*mvi->chip->n_phy,
        MVS_CHIP_DISP->read_phy_ctl(mvi, phy_no));
    mv_dprintk("phy %d irq sts = 0x%08X\n", phy_no+mvi->id*mvi->chip->n_phy,
        phy->irq_status);

    /*
    * events is port event now ,
    * we need check the interrupt status which belongs to per port.
    */

    if (phy->irq_status & PHYEV_DCDR_ERR) {
        mv_dprintk("phy %d STP decoding error.\n",
        phy_no + mvi->id*mvi->chip->n_phy);
    }

    if (phy->irq_status & PHYEV_POOF) {
        mdelay(500);
        if (!(phy->phy_event & PHY_PLUG_OUT)) {
            int dev_sata = phy->phy_type & PORT_TYPE_SATA;
            int ready;
            mvs_do_release_task(mvi, phy_no, NULL);
            phy->phy_event |= PHY_PLUG_OUT;
            MVS_CHIP_DISP->clear_srs_irq(mvi, 0, 1);
            mvs_handle_event(mvi,
                (void *)(unsigned long)phy_no,
                PHY_PLUG_EVENT);
            ready = mvs_is_phy_ready(mvi, phy_no);
            if (ready || dev_sata) {
                if (MVS_CHIP_DISP->stp_reset)
                    MVS_CHIP_DISP->stp_reset(mvi,
                            phy_no);
                else
                    MVS_CHIP_DISP->phy_reset(mvi,
                            phy_no, MVS_SOFT_RESET);
                return;
            }
        }
    }

    if (phy->irq_status & PHYEV_COMWAKE) {
        tmp = MVS_CHIP_DISP->read_port_irq_mask(mvi, phy_no);
        MVS_CHIP_DISP->write_port_irq_mask(mvi, phy_no,
                    tmp | PHYEV_SIG_FIS);
        if (phy->timer.function == NULL) {
            phy->timer.data = (unsigned long)phy;
            phy->timer.function = mvs_sig_time_out;
            phy->timer.expires = jiffies + 5*HZ;
            add_timer(&phy->timer);
        }
    }
    if (phy->irq_status & (PHYEV_SIG_FIS | PHYEV_ID_DONE)) {
        phy->phy_status = mvs_is_phy_ready(mvi, phy_no);
        mv_dprintk("notify plug in on phy[%d]\n", phy_no);
        if (phy->phy_status) {
            mdelay(10);
            MVS_CHIP_DISP->detect_porttype(mvi, phy_no);
            if (phy->phy_type & PORT_TYPE_SATA) {
                tmp = MVS_CHIP_DISP->read_port_irq_mask(
                        mvi, phy_no);
                tmp &= ~PHYEV_SIG_FIS;
                MVS_CHIP_DISP->write_port_irq_mask(mvi,
                            phy_no, tmp);
            }
            mvs_update_phyinfo(mvi, phy_no, 0);
            if (phy->phy_type & PORT_TYPE_SAS) {
                MVS_CHIP_DISP->phy_reset(mvi, phy_no, MVS_PHY_TUNE);
                mdelay(10);
            }

            mvs_bytes_dmaed(mvi, phy_no);
            /* whether driver is going to handle hot plug */
            if (phy->phy_event & PHY_PLUG_OUT) {
                mvs_port_notify_formed(&phy->sas_phy, 0);
                phy->phy_event &= ~PHY_PLUG_OUT;
            }
        } else {
            mv_dprintk("plugin interrupt but phy%d is gone\n",
                phy_no + mvi->id*mvi->chip->n_phy);
        }
    } else if (phy->irq_status & PHYEV_BROAD_CH) {
        mv_dprintk("phy %d broadcast change.\n",
            phy_no + mvi->id*mvi->chip->n_phy);
        mvs_handle_event(mvi, (void *)(unsigned long)phy_no,
                EXP_BRCT_CHG);
    }
}

int mvs_int_rx(struct mvs_info *mvi, bool self_clear)
{
    u32 rx_prod_idx, rx_desc;
    bool attn = false;

    /* the first dword in the RX ring is special: it contains
     * a mirror of the hardware's RX producer index, so that
     * we don't have to stall the CPU reading that register.
     * The actual RX ring is offset by one dword, due to this.
     */
    rx_prod_idx = mvi->rx_cons;
    mvi->rx_cons = le32_to_cpu(mvi->rx[0]);
    if (mvi->rx_cons == 0xfff)  /* h/w hasn't touched RX ring yet */
        return 0;

    /* The CMPL_Q may come late, read from register and try again
    * note: if coalescing is enabled,
    * it will need to read from register every time for sure
    */
    if (unlikely(mvi->rx_cons == rx_prod_idx))
        mvi->rx_cons = MVS_CHIP_DISP->rx_update(mvi) & RX_RING_SZ_MASK;

    if (mvi->rx_cons == rx_prod_idx)
        return 0;

    while (mvi->rx_cons != rx_prod_idx) {
        /* increment our internal RX consumer pointer */
        rx_prod_idx = (rx_prod_idx + 1) & (MVS_RX_RING_SZ - 1);
        rx_desc = le32_to_cpu(mvi->rx[rx_prod_idx + 1]);

        if (likely(rx_desc & RXQ_DONE))
            mvs_slot_complete(mvi, rx_desc, 0);
        if (rx_desc & RXQ_ATTN) {
            attn = true;
        } else if (rx_desc & RXQ_ERR) {
            if (!(rx_desc & RXQ_DONE))
                mvs_slot_complete(mvi, rx_desc, 0);
        } else if (rx_desc & RXQ_SLOT_RESET) {
            mvs_slot_free(mvi, rx_desc);
        }
    }

    if (attn && self_clear)
        MVS_CHIP_DISP->int_full(mvi);
    return 0;
}