/*
 * PMC-Sierra SPC 8001 SAS/SATA based host adapters driver
 *
 * Copyright (c) 2008-2009 USI Co., Ltd.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * 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 OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 *
 */

#include <linux/slab.h>
#include "pm8001_sas.h"

/**
 * pm8001_find_tag - from sas task to find out  tag that belongs to this task
 * @task: the task sent to the LLDD
 * @tag: the found tag associated with the task
 */
static int pm8001_find_tag(struct sas_task *task, u32 *tag)
{
        if (task->lldd_task) {
                struct pm8001_ccb_info *ccb;
                ccb = task->lldd_task;
                *tag = ccb->ccb_tag;
                return 1;
        }
        return 0;
}

/**
  * pm8001_tag_clear - clear the tags bitmap
  * @pm8001_ha: our hba struct
  * @tag: the found tag associated with the task
  */
static void pm8001_tag_clear(struct pm8001_hba_info *pm8001_ha, u32 tag)
{
        void *bitmap = pm8001_ha->tags;
        clear_bit(tag, bitmap);
}

static void pm8001_tag_free(struct pm8001_hba_info *pm8001_ha, u32 tag)
{
        pm8001_tag_clear(pm8001_ha, tag);
}

static void pm8001_tag_set(struct pm8001_hba_info *pm8001_ha, u32 tag)
{
        void *bitmap = pm8001_ha->tags;
        set_bit(tag, bitmap);
}

/**
  * pm8001_tag_alloc - allocate a empty tag for task used.
  * @pm8001_ha: our hba struct
  * @tag_out: the found empty tag .
  */
inline int pm8001_tag_alloc(struct pm8001_hba_info *pm8001_ha, u32 *tag_out)
{
        unsigned int index, tag;
        void *bitmap = pm8001_ha->tags;

        index = find_first_zero_bit(bitmap, pm8001_ha->tags_num);
        tag = index;
        if (tag >= pm8001_ha->tags_num)
                return -SAS_QUEUE_FULL;
        pm8001_tag_set(pm8001_ha, tag);
        *tag_out = tag;
        return 0;
}

void pm8001_tag_init(struct pm8001_hba_info *pm8001_ha)
{
        int i;
        for (i = 0; i < pm8001_ha->tags_num; ++i)
                pm8001_tag_clear(pm8001_ha, i);
}

 /**
  * pm8001_mem_alloc - allocate memory for pm8001.
  * @pdev: pci device.
  * @virt_addr: the allocated virtual address
  * @pphys_addr_hi: the physical address high byte address.
  * @pphys_addr_lo: the physical address low byte address.
  * @mem_size: memory size.
  */
int pm8001_mem_alloc(struct pci_dev *pdev, void **virt_addr,
        dma_addr_t *pphys_addr, u32 *pphys_addr_hi,
        u32 *pphys_addr_lo, u32 mem_size, u32 align)
{
        caddr_t mem_virt_alloc;
        dma_addr_t mem_dma_handle;
        u64 phys_align;
        u64 align_offset = 0;
        if (align)
                align_offset = (dma_addr_t)align - 1;
        mem_virt_alloc =
                pci_alloc_consistent(pdev, mem_size + align, &mem_dma_handle);
        if (!mem_virt_alloc) {
                pm8001_printk("memory allocation error\n");
                return -1;
        }
        memset((void *)mem_virt_alloc, 0, mem_size+align);
        *pphys_addr = mem_dma_handle;
        phys_align = (*pphys_addr + align_offset) & ~align_offset;
        *virt_addr = (void *)mem_virt_alloc + phys_align - *pphys_addr;
        *pphys_addr_hi = upper_32_bits(phys_align);
        *pphys_addr_lo = lower_32_bits(phys_align);
        return 0;
}
/**
  * pm8001_find_ha_by_dev - from domain device which come from sas layer to
  * find out our hba struct.
  * @dev: the domain device which from sas layer.
  */
static
struct pm8001_hba_info *pm8001_find_ha_by_dev(struct domain_device *dev)
{
        struct sas_ha_struct *sha = dev->port->ha;
        struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
        return pm8001_ha;
}

/**
  * pm8001_phy_control - this function should be registered to
  * sas_domain_function_template to provide libsas used, note: this is just
  * control the HBA phy rather than other expander phy if you want control
  * other phy, you should use SMP command.
  * @sas_phy: which phy in HBA phys.
  * @func: the operation.
  * @funcdata: always NULL.
  */
int pm8001_phy_control(struct asd_sas_phy *sas_phy, enum phy_func func,
        void *funcdata)
{
        int rc = 0, phy_id = sas_phy->id;
        struct pm8001_hba_info *pm8001_ha = NULL;
        struct sas_phy_linkrates *rates;
        DECLARE_COMPLETION_ONSTACK(completion);
        pm8001_ha = sas_phy->ha->lldd_ha;
        pm8001_ha->phy[phy_id].enable_completion = &completion;
        switch (func) {
        case PHY_FUNC_SET_LINK_RATE:
                rates = funcdata;
                if (rates->minimum_linkrate) {
                        pm8001_ha->phy[phy_id].minimum_linkrate =
                                rates->minimum_linkrate;
                }
                if (rates->maximum_linkrate) {
                        pm8001_ha->phy[phy_id].maximum_linkrate =
                                rates->maximum_linkrate;
                }
                if (pm8001_ha->phy[phy_id].phy_state == 0) {
                        PM8001_CHIP_DISP->phy_start_req(pm8001_ha, phy_id);
                        wait_for_completion(&completion);
                }
                PM8001_CHIP_DISP->phy_ctl_req(pm8001_ha, phy_id,
                                              PHY_LINK_RESET);
                break;
        case PHY_FUNC_HARD_RESET:
                if (pm8001_ha->phy[phy_id].phy_state == 0) {
                        PM8001_CHIP_DISP->phy_start_req(pm8001_ha, phy_id);
                        wait_for_completion(&completion);
                }
                PM8001_CHIP_DISP->phy_ctl_req(pm8001_ha, phy_id,
                                              PHY_HARD_RESET);
                break;
        case PHY_FUNC_LINK_RESET:
                if (pm8001_ha->phy[phy_id].phy_state == 0) {
                        PM8001_CHIP_DISP->phy_start_req(pm8001_ha, phy_id);
                        wait_for_completion(&completion);
                }
                PM8001_CHIP_DISP->phy_ctl_req(pm8001_ha, phy_id,
                                              PHY_LINK_RESET);
                break;
        case PHY_FUNC_RELEASE_SPINUP_HOLD:
                PM8001_CHIP_DISP->phy_ctl_req(pm8001_ha, phy_id,
                                              PHY_LINK_RESET);
                break;
        case PHY_FUNC_DISABLE:
                PM8001_CHIP_DISP->phy_stop_req(pm8001_ha, phy_id);
                break;
        default:
                rc = -EOPNOTSUPP;
        }
        msleep(300);
        return rc;
}

int pm8001_slave_alloc(struct scsi_device *scsi_dev)
{
        struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
        if (dev_is_sata(dev)) {
                /* We don't need to rescan targets
                * if REPORT_LUNS request is failed
                */
                if (scsi_dev->lun > 0)
                        return -ENXIO;
                scsi_dev->tagged_supported = 1;
        }
        return sas_slave_alloc(scsi_dev);
}

/**
  * pm8001_scan_start - we should enable all HBA phys by sending the phy_start
  * command to HBA.
  * @shost: the scsi host data.
  */
void pm8001_scan_start(struct Scsi_Host *shost)
{
        int i;
        struct pm8001_hba_info *pm8001_ha;
        struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
        pm8001_ha = sha->lldd_ha;
        PM8001_CHIP_DISP->sas_re_init_req(pm8001_ha);
        for (i = 0; i < pm8001_ha->chip->n_phy; ++i)
                PM8001_CHIP_DISP->phy_start_req(pm8001_ha, i);
}

int pm8001_scan_finished(struct Scsi_Host *shost, unsigned long time)
{
        /* give the phy enabling interrupt event time to come in (1s
        * is empirically about all it takes) */
        if (time < HZ)
                return 0;
        /* Wait for discovery to finish */
        scsi_flush_work(shost);
        return 1;
}

/**
  * pm8001_task_prep_smp - the dispatcher function, prepare data for smp task
  * @pm8001_ha: our hba card information
  * @ccb: the ccb which attached to smp task
  */
static int pm8001_task_prep_smp(struct pm8001_hba_info *pm8001_ha,
        struct pm8001_ccb_info *ccb)
{
        return PM8001_CHIP_DISP->smp_req(pm8001_ha, ccb);
}

u32 pm8001_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;
}

/**
  * pm8001_task_prep_ata - the dispatcher function, prepare data for sata task
  * @pm8001_ha: our hba card information
  * @ccb: the ccb which attached to sata task
  */
static int pm8001_task_prep_ata(struct pm8001_hba_info *pm8001_ha,
        struct pm8001_ccb_info *ccb)
{
        return PM8001_CHIP_DISP->sata_req(pm8001_ha, ccb);
}

/**
  * pm8001_task_prep_ssp_tm - the dispatcher function, prepare task management data
  * @pm8001_ha: our hba card information
  * @ccb: the ccb which attached to TM
  * @tmf: the task management IU
  */
static int pm8001_task_prep_ssp_tm(struct pm8001_hba_info *pm8001_ha,
        struct pm8001_ccb_info *ccb, struct pm8001_tmf_task *tmf)
{
        return PM8001_CHIP_DISP->ssp_tm_req(pm8001_ha, ccb, tmf);
}

/**
  * pm8001_task_prep_ssp - the dispatcher function,prepare ssp data for ssp task
  * @pm8001_ha: our hba card information
  * @ccb: the ccb which attached to ssp task
  */
static int pm8001_task_prep_ssp(struct pm8001_hba_info *pm8001_ha,
        struct pm8001_ccb_info *ccb)
{
        return PM8001_CHIP_DISP->ssp_io_req(pm8001_ha, ccb);
}
int pm8001_slave_configure(struct scsi_device *sdev)
{
        struct domain_device *dev = sdev_to_domain_dev(sdev);
        int ret = sas_slave_configure(sdev);
        if (ret)
                return ret;
        if (dev_is_sata(dev)) {
        #ifdef PM8001_DISABLE_NCQ
                struct ata_port *ap = dev->sata_dev.ap;
                struct ata_device *adev = ap->link.device;
                adev->flags |= ATA_DFLAG_NCQ_OFF;
                scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, 1);
        #endif
        }
        return 0;
}
 /* Find the local port id that's attached to this device */
static int sas_find_local_port_id(struct domain_device *dev)
{
        struct domain_device *pdev = dev->parent;

        /* Directly attached device */
        if (!pdev)
                return dev->port->id;
        while (pdev) {
                struct domain_device *pdev_p = pdev->parent;
                if (!pdev_p)
                        return pdev->port->id;
                pdev = pdev->parent;
        }
        return 0;
}

/**
  * pm8001_task_exec - queue the task(ssp, smp && ata) to the hardware.
  * @task: the task to be execute.
  * @num: if can_queue great than 1, the task can be queued up. for SMP task,
  * we always execute one one time.
  * @gfp_flags: gfp_flags.
  * @is_tmf: if it is task management task.
  * @tmf: the task management IU
  */
#define DEV_IS_GONE(pm8001_dev) \
        ((!pm8001_dev || (pm8001_dev->dev_type == NO_DEVICE)))
static int pm8001_task_exec(struct sas_task *task, const int num,
        gfp_t gfp_flags, int is_tmf, struct pm8001_tmf_task *tmf)
{
        struct domain_device *dev = task->dev;
        struct pm8001_hba_info *pm8001_ha;
        struct pm8001_device *pm8001_dev;
        struct pm8001_port *port = NULL;
        struct sas_task *t = task;
        struct pm8001_ccb_info *ccb;
        u32 tag = 0xdeadbeef, rc, n_elem = 0;
        u32 n = num;
        unsigned long flags = 0, flags_libsas = 0;

        if (!dev->port) {
                struct task_status_struct *tsm = &t->task_status;
                tsm->resp = SAS_TASK_UNDELIVERED;
                tsm->stat = SAS_PHY_DOWN;
                if (dev->dev_type != SATA_DEV)
                        t->task_done(t);
                return 0;
        }
        pm8001_ha = pm8001_find_ha_by_dev(task->dev);
        PM8001_IO_DBG(pm8001_ha, pm8001_printk("pm8001_task_exec device \n "));
        spin_lock_irqsave(&pm8001_ha->lock, flags);
        do {
                dev = t->dev;
                pm8001_dev = dev->lldd_dev;
                if (DEV_IS_GONE(pm8001_dev)) {
                        if (pm8001_dev) {
                                PM8001_IO_DBG(pm8001_ha,
                                        pm8001_printk("device %d not ready.\n",
                                        pm8001_dev->device_id));
                        } else {
                                PM8001_IO_DBG(pm8001_ha,
                                        pm8001_printk("device %016llx not "
                                        "ready.\n", SAS_ADDR(dev->sas_addr)));
                        }
                        rc = SAS_PHY_DOWN;
                        goto out_done;
                }
                port = &pm8001_ha->port[sas_find_local_port_id(dev)];
                if (!port->port_attached) {
                        if (sas_protocol_ata(t->task_proto)) {
                                struct task_status_struct *ts = &t->task_status;
                                ts->resp = SAS_TASK_UNDELIVERED;
                                ts->stat = SAS_PHY_DOWN;

                                spin_unlock_irqrestore(&pm8001_ha->lock, flags);
                                spin_unlock_irqrestore(dev->sata_dev.ap->lock,
                                                flags_libsas);
                                t->task_done(t);
                                spin_lock_irqsave(dev->sata_dev.ap->lock,
                                        flags_libsas);
                                spin_lock_irqsave(&pm8001_ha->lock, flags);
                                if (n > 1)
                                        t = list_entry(t->list.next,
                                                        struct sas_task, list);
                                continue;
                        } else {
                                struct task_status_struct *ts = &t->task_status;
                                ts->resp = SAS_TASK_UNDELIVERED;
                                ts->stat = SAS_PHY_DOWN;
                                t->task_done(t);
                                if (n > 1)
                                        t = list_entry(t->list.next,
                                                        struct sas_task, list);
                                continue;
                        }
                }
                rc = pm8001_tag_alloc(pm8001_ha, &tag);
                if (rc)
                        goto err_out;
                ccb = &pm8001_ha->ccb_info[tag];

                if (!sas_protocol_ata(t->task_proto)) {
                        if (t->num_scatter) {
                                n_elem = dma_map_sg(pm8001_ha->dev,
                                        t->scatter,
                                        t->num_scatter,
                                        t->data_dir);
                                if (!n_elem) {
                                        rc = -ENOMEM;
                                        goto err_out_tag;
                                }
                        }
                } else {
                        n_elem = t->num_scatter;
                }

                t->lldd_task = ccb;
                ccb->n_elem = n_elem;
                ccb->ccb_tag = tag;
                ccb->task = t;
                switch (t->task_proto) {
                case SAS_PROTOCOL_SMP:
                        rc = pm8001_task_prep_smp(pm8001_ha, ccb);
                        break;
                case SAS_PROTOCOL_SSP:
                        if (is_tmf)
                                rc = pm8001_task_prep_ssp_tm(pm8001_ha,
                                        ccb, tmf);
                        else
                                rc = pm8001_task_prep_ssp(pm8001_ha, ccb);
                        break;
                case SAS_PROTOCOL_SATA:
                case SAS_PROTOCOL_STP:
                case SAS_PROTOCOL_SATA | SAS_PROTOCOL_STP:
                        rc = pm8001_task_prep_ata(pm8001_ha, ccb);
                        break;
                default:
                        dev_printk(KERN_ERR, pm8001_ha->dev,
                                "unknown sas_task proto: 0x%x\n",
                                t->task_proto);
                        rc = -EINVAL;
                        break;
                }

                if (rc) {
                        PM8001_IO_DBG(pm8001_ha,
                                pm8001_printk("rc is %x\n", rc));
                        goto err_out_tag;
                }
                /* TODO: select normal or high priority */
                spin_lock(&t->task_state_lock);
                t->task_state_flags |= SAS_TASK_AT_INITIATOR;
                spin_unlock(&t->task_state_lock);
                pm8001_dev->running_req++;
                if (n > 1)
                        t = list_entry(t->list.next, struct sas_task, list);
        } while (--n);
        rc = 0;
        goto out_done;

err_out_tag:
        pm8001_tag_free(pm8001_ha, tag);
err_out:
        dev_printk(KERN_ERR, pm8001_ha->dev, "pm8001 exec failed[%d]!\n", rc);
        if (!sas_protocol_ata(t->task_proto))
                if (n_elem)
                        dma_unmap_sg(pm8001_ha->dev, t->scatter, n_elem,
                                t->data_dir);
out_done:
        spin_unlock_irqrestore(&pm8001_ha->lock, flags);
        return rc;
}

/**
  * pm8001_queue_command - register for upper layer used, all IO commands sent
  * to HBA are from this interface.
  * @task: the task to be execute.
  * @num: if can_queue great than 1, the task can be queued up. for SMP task,
  * we always execute one one time
  * @gfp_flags: gfp_flags
  */
int pm8001_queue_command(struct sas_task *task, const int num,
                gfp_t gfp_flags)
{
        return pm8001_task_exec(task, num, gfp_flags, 0, NULL);
}

void pm8001_ccb_free(struct pm8001_hba_info *pm8001_ha, u32 ccb_idx)
{
        pm8001_tag_clear(pm8001_ha, ccb_idx);
}

/**
  * pm8001_ccb_task_free - free the sg for ssp and smp command, free the ccb.
  * @pm8001_ha: our hba card information
  * @ccb: the ccb which attached to ssp task
  * @task: the task to be free.
  * @ccb_idx: ccb index.
  */
void pm8001_ccb_task_free(struct pm8001_hba_info *pm8001_ha,
        struct sas_task *task, struct pm8001_ccb_info *ccb, u32 ccb_idx)
{
        if (!ccb->task)
                return;
        if (!sas_protocol_ata(task->task_proto))
                if (ccb->n_elem)
                        dma_unmap_sg(pm8001_ha->dev, task->scatter,
                                task->num_scatter, task->data_dir);

        switch (task->task_proto) {
        case SAS_PROTOCOL_SMP:
                dma_unmap_sg(pm8001_ha->dev, &task->smp_task.smp_resp, 1,
                        PCI_DMA_FROMDEVICE);
                dma_unmap_sg(pm8001_ha->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;
        }
        task->lldd_task = NULL;
        ccb->task = NULL;
        ccb->ccb_tag = 0xFFFFFFFF;
        pm8001_ccb_free(pm8001_ha, ccb_idx);
}

 /**
  * pm8001_alloc_dev - find a empty pm8001_device
  * @pm8001_ha: our hba card information
  */
struct pm8001_device *pm8001_alloc_dev(struct pm8001_hba_info *pm8001_ha)
{
        u32 dev;
        for (dev = 0; dev < PM8001_MAX_DEVICES; dev++) {
                if (pm8001_ha->devices[dev].dev_type == NO_DEVICE) {
                        pm8001_ha->devices[dev].id = dev;
                        return &pm8001_ha->devices[dev];
                }
        }
        if (dev == PM8001_MAX_DEVICES) {
                PM8001_FAIL_DBG(pm8001_ha,
                        pm8001_printk("max support %d devices, ignore ..\n",
                        PM8001_MAX_DEVICES));
        }
        return NULL;
}

static void pm8001_free_dev(struct pm8001_device *pm8001_dev)
{
        u32 id = pm8001_dev->id;
        memset(pm8001_dev, 0, sizeof(*pm8001_dev));
        pm8001_dev->id = id;
        pm8001_dev->dev_type = NO_DEVICE;
        pm8001_dev->device_id = PM8001_MAX_DEVICES;
        pm8001_dev->sas_device = NULL;
}

/**
  * pm8001_dev_found_notify - libsas notify a device is found.
  * @dev: the device structure which sas layer used.
  *
  * when libsas find a sas domain device, it should tell the LLDD that
  * device is found, and then LLDD register this device to HBA firmware
  * by the command "OPC_INB_REG_DEV", after that the HBA will assign a
  * device ID(according to device's sas address) and returned it to LLDD. From
  * now on, we communicate with HBA FW with the device ID which HBA assigned
  * rather than sas address. it is the necessary step for our HBA but it is
  * the optional for other HBA driver.
  */
static int pm8001_dev_found_notify(struct domain_device *dev)
{
        unsigned long flags = 0;
        int res = 0;
        struct pm8001_hba_info *pm8001_ha = NULL;
        struct domain_device *parent_dev = dev->parent;
        struct pm8001_device *pm8001_device;
        DECLARE_COMPLETION_ONSTACK(completion);
        u32 flag = 0;
        pm8001_ha = pm8001_find_ha_by_dev(dev);
        spin_lock_irqsave(&pm8001_ha->lock, flags);

        pm8001_device = pm8001_alloc_dev(pm8001_ha);
        if (!pm8001_device) {
                res = -1;
                goto found_out;
        }
        pm8001_device->sas_device = dev;
        dev->lldd_dev = pm8001_device;
        pm8001_device->dev_type = dev->dev_type;
        pm8001_device->dcompletion = &completion;
        if (parent_dev && DEV_IS_EXPANDER(parent_dev->dev_type)) {
                int phy_id;
                struct ex_phy *phy;
                for (phy_id = 0; phy_id < parent_dev->ex_dev.num_phys;
                phy_id++) {
                        phy = &parent_dev->ex_dev.ex_phy[phy_id];
                        if (SAS_ADDR(phy->attached_sas_addr)
                                == SAS_ADDR(dev->sas_addr)) {
                                pm8001_device->attached_phy = phy_id;
                                break;
                        }
                }
                if (phy_id == parent_dev->ex_dev.num_phys) {
                        PM8001_FAIL_DBG(pm8001_ha,
                        pm8001_printk("Error: no attached dev:%016llx"
                        " at ex:%016llx.\n", SAS_ADDR(dev->sas_addr),
                                SAS_ADDR(parent_dev->sas_addr)));
                        res = -1;
                }
        } else {
                if (dev->dev_type == SATA_DEV) {
                        pm8001_device->attached_phy =
                                dev->rphy->identify.phy_identifier;
                                flag = 1; /* directly sata*/
                }
        } /*register this device to HBA*/
        PM8001_DISC_DBG(pm8001_ha, pm8001_printk("Found device \n"));
        PM8001_CHIP_DISP->reg_dev_req(pm8001_ha, pm8001_device, flag);
        spin_unlock_irqrestore(&pm8001_ha->lock, flags);
        wait_for_completion(&completion);
        if (dev->dev_type == SAS_END_DEV)
                msleep(50);
        pm8001_ha->flags |= PM8001F_RUN_TIME ;
        return 0;
found_out:
        spin_unlock_irqrestore(&pm8001_ha->lock, flags);
        return res;
}

int pm8001_dev_found(struct domain_device *dev)
{
        return pm8001_dev_found_notify(dev);
}

/**
  * pm8001_alloc_task - allocate a task structure for TMF
  */
static struct sas_task *pm8001_alloc_task(void)
{
        struct sas_task *task = kzalloc(sizeof(*task), GFP_KERNEL);
        if (task) {
                INIT_LIST_HEAD(&task->list);
                spin_lock_init(&task->task_state_lock);
                task->task_state_flags = SAS_TASK_STATE_PENDING;
                init_timer(&task->timer);
                init_completion(&task->completion);
        }
        return task;
}

static void pm8001_free_task(struct sas_task *task)
{
        if (task) {
                BUG_ON(!list_empty(&task->list));
                kfree(task);
        }
}

static void pm8001_task_done(struct sas_task *task)
{
        if (!del_timer(&task->timer))
                return;
        complete(&task->completion);
}

static void pm8001_tmf_timedout(unsigned long data)
{
        struct sas_task *task = (struct sas_task *)data;

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

#define PM8001_TASK_TIMEOUT 20
/**
  * pm8001_exec_internal_tmf_task - execute some task management commands.
  * @dev: the wanted device.
  * @tmf: which task management wanted to be take.
  * @para_len: para_len.
  * @parameter: ssp task parameter.
  *
  * when errors or exception happened, we may want to do something, for example
  * abort the issued task which result in this execption, it is done by calling
  * this function, note it is also with the task execute interface.
  */
static int pm8001_exec_internal_tmf_task(struct domain_device *dev,
        void *parameter, u32 para_len, struct pm8001_tmf_task *tmf)
{
        int res, retry;
        struct sas_task *task = NULL;
        struct pm8001_hba_info *pm8001_ha = pm8001_find_ha_by_dev(dev);

        for (retry = 0; retry < 3; retry++) {
                task = pm8001_alloc_task();
                if (!task)
                        return -ENOMEM;

                task->dev = dev;
                task->task_proto = dev->tproto;
                memcpy(&task->ssp_task, parameter, para_len);
                task->task_done = pm8001_task_done;
                task->timer.data = (unsigned long)task;
                task->timer.function = pm8001_tmf_timedout;
                task->timer.expires = jiffies + PM8001_TASK_TIMEOUT*HZ;
                add_timer(&task->timer);

                res = pm8001_task_exec(task, 1, GFP_KERNEL, 1, tmf);

                if (res) {
                        del_timer(&task->timer);
                        PM8001_FAIL_DBG(pm8001_ha,
                                pm8001_printk("Executing internal task "
                                "failed\n"));
                        goto ex_err;
                }
                wait_for_completion(&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)) {
                                PM8001_FAIL_DBG(pm8001_ha,
                                        pm8001_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) {
                        PM8001_FAIL_DBG(pm8001_ha,
                                pm8001_printk("Blocked task error.\n"));
                        res = -EMSGSIZE;
                        break;
                } else {
                        PM8001_EH_DBG(pm8001_ha,
                                pm8001_printk(" Task to dev %016llx response:"
                                "0x%x status 0x%x\n",
                                SAS_ADDR(dev->sas_addr),
                                task->task_status.resp,
                                task->task_status.stat));
                        pm8001_free_task(task);
                        task = NULL;
                }
        }
ex_err:
        BUG_ON(retry == 3 && task != NULL);
        if (task != NULL)
                pm8001_free_task(task);
        return res;
}

static int
pm8001_exec_internal_task_abort(struct pm8001_hba_info *pm8001_ha,
        struct pm8001_device *pm8001_dev, struct domain_device *dev, u32 flag,
        u32 task_tag)
{
        int res, retry;
        u32 ccb_tag;
        struct pm8001_ccb_info *ccb;
        struct sas_task *task = NULL;

        for (retry = 0; retry < 3; retry++) {
                task = pm8001_alloc_task();
                if (!task)
                        return -ENOMEM;

                task->dev = dev;
                task->task_proto = dev->tproto;
                task->task_done = pm8001_task_done;
                task->timer.data = (unsigned long)task;
                task->timer.function = pm8001_tmf_timedout;
                task->timer.expires = jiffies + PM8001_TASK_TIMEOUT * HZ;
                add_timer(&task->timer);

                res = pm8001_tag_alloc(pm8001_ha, &ccb_tag);
                if (res)
                        return res;
                ccb = &pm8001_ha->ccb_info[ccb_tag];
                ccb->device = pm8001_dev;
                ccb->ccb_tag = ccb_tag;
                ccb->task = task;

                res = PM8001_CHIP_DISP->task_abort(pm8001_ha,
                        pm8001_dev, flag, task_tag, ccb_tag);

                if (res) {
                        del_timer(&task->timer);
                        PM8001_FAIL_DBG(pm8001_ha,
                                pm8001_printk("Executing internal task "
                                "failed\n"));
                        goto ex_err;
                }
                wait_for_completion(&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)) {
                                PM8001_FAIL_DBG(pm8001_ha,
                                        pm8001_printk("TMF task timeout.\n"));
                                goto ex_err;
                        }
                }

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

                } else {
                        PM8001_EH_DBG(pm8001_ha,
                                pm8001_printk(" Task to dev %016llx response: "
                                        "0x%x status 0x%x\n",
                                SAS_ADDR(dev->sas_addr),
                                task->task_status.resp,
                                task->task_status.stat));
                        pm8001_free_task(task);
                        task = NULL;
                }
        }
ex_err:
        BUG_ON(retry == 3 && task != NULL);
        if (task != NULL)
                pm8001_free_task(task);
        return res;
}

/**
  * pm8001_dev_gone_notify - see the comments for "pm8001_dev_found_notify"
  * @dev: the device structure which sas layer used.
  */
static void pm8001_dev_gone_notify(struct domain_device *dev)
{
        unsigned long flags = 0;
        u32 tag;
        struct pm8001_hba_info *pm8001_ha;
        struct pm8001_device *pm8001_dev = dev->lldd_dev;

        pm8001_ha = pm8001_find_ha_by_dev(dev);
        spin_lock_irqsave(&pm8001_ha->lock, flags);
        pm8001_tag_alloc(pm8001_ha, &tag);
        if (pm8001_dev) {
                u32 device_id = pm8001_dev->device_id;

                PM8001_DISC_DBG(pm8001_ha,
                        pm8001_printk("found dev[%d:%x] is gone.\n",
                        pm8001_dev->device_id, pm8001_dev->dev_type));
                if (pm8001_dev->running_req) {
                        spin_unlock_irqrestore(&pm8001_ha->lock, flags);
                        pm8001_exec_internal_task_abort(pm8001_ha, pm8001_dev ,
                                dev, 1, 0);
                        spin_lock_irqsave(&pm8001_ha->lock, flags);
                }
                PM8001_CHIP_DISP->dereg_dev_req(pm8001_ha, device_id);
                pm8001_free_dev(pm8001_dev);
        } else {
                PM8001_DISC_DBG(pm8001_ha,
                        pm8001_printk("Found dev has gone.\n"));
        }
        dev->lldd_dev = NULL;
        spin_unlock_irqrestore(&pm8001_ha->lock, flags);
}

void pm8001_dev_gone(struct domain_device *dev)
{
        pm8001_dev_gone_notify(dev);
}

static int pm8001_issue_ssp_tmf(struct domain_device *dev,
        u8 *lun, struct pm8001_tmf_task *tmf)
{
        struct sas_ssp_task ssp_task;
        if (!(dev->tproto & SAS_PROTOCOL_SSP))
                return TMF_RESP_FUNC_ESUPP;

        strncpy((u8 *)&ssp_task.LUN, lun, 8);
        return pm8001_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
  */
int pm8001_I_T_nexus_reset(struct domain_device *dev)
{
        int rc = TMF_RESP_FUNC_FAILED;
        struct pm8001_device *pm8001_dev;
        struct pm8001_hba_info *pm8001_ha;
        struct sas_phy *phy;
        if (!dev || !dev->lldd_dev)
                return -1;

        pm8001_dev = dev->lldd_dev;
        pm8001_ha = pm8001_find_ha_by_dev(dev);
        phy = sas_find_local_phy(dev);

        if (dev_is_sata(dev)) {
                DECLARE_COMPLETION_ONSTACK(completion_setstate);
                if (scsi_is_sas_phy_local(phy))
                        return 0;
                rc = sas_phy_reset(phy, 1);
                msleep(2000);
                rc = pm8001_exec_internal_task_abort(pm8001_ha, pm8001_dev ,
                        dev, 1, 0);
                pm8001_dev->setds_completion = &completion_setstate;
                rc = PM8001_CHIP_DISP->set_dev_state_req(pm8001_ha,
                        pm8001_dev, 0x01);
                wait_for_completion(&completion_setstate);
        } else{
        rc = sas_phy_reset(phy, 1);
        msleep(2000);
        }
        PM8001_EH_DBG(pm8001_ha, pm8001_printk(" for device[%x]:rc=%d\n",
                pm8001_dev->device_id, rc));
        return rc;
}

/* mandatory SAM-3, the task reset the specified LUN*/
int pm8001_lu_reset(struct domain_device *dev, u8 *lun)
{
        int rc = TMF_RESP_FUNC_FAILED;
        struct pm8001_tmf_task tmf_task;
        struct pm8001_device *pm8001_dev = dev->lldd_dev;
        struct pm8001_hba_info *pm8001_ha = pm8001_find_ha_by_dev(dev);
        if (dev_is_sata(dev)) {
                struct sas_phy *phy = sas_find_local_phy(dev);
                rc = pm8001_exec_internal_task_abort(pm8001_ha, pm8001_dev ,
                        dev, 1, 0);
                rc = sas_phy_reset(phy, 1);
                rc = PM8001_CHIP_DISP->set_dev_state_req(pm8001_ha,
                        pm8001_dev, 0x01);
                msleep(2000);
        } else {
                tmf_task.tmf = TMF_LU_RESET;
                rc = pm8001_issue_ssp_tmf(dev, lun, &tmf_task);
        }
        /* If failed, fall-through I_T_Nexus reset */
        PM8001_EH_DBG(pm8001_ha, pm8001_printk("for device[%x]:rc=%d\n",
                pm8001_dev->device_id, rc));
        return rc;
}

/* optional SAM-3 */
int pm8001_query_task(struct sas_task *task)
{
        u32 tag = 0xdeadbeef;
        int i = 0;
        struct scsi_lun lun;
        struct pm8001_tmf_task tmf_task;

        int rc = TMF_RESP_FUNC_FAILED;
        if (unlikely(!task || !task->lldd_task || !task->dev))
                return rc;

        if (task->task_proto & SAS_PROTOCOL_SSP) {
                struct scsi_cmnd *cmnd = task->uldd_task;
                struct domain_device *dev = task->dev;
                struct pm8001_hba_info *pm8001_ha =
                        pm8001_find_ha_by_dev(dev);

                int_to_scsilun(cmnd->device->lun, &lun);
                rc = pm8001_find_tag(task, &tag);
                if (rc == 0) {
                        rc = TMF_RESP_FUNC_FAILED;
                        return rc;
                }
                PM8001_EH_DBG(pm8001_ha, pm8001_printk("Query:["));
                for (i = 0; i < 16; i++)
                        printk(KERN_INFO "%02x ", cmnd->cmnd[i]);
                printk(KERN_INFO "]\n");
                tmf_task.tmf =  TMF_QUERY_TASK;
                tmf_task.tag_of_task_to_be_managed = tag;

                rc = pm8001_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:
                        PM8001_EH_DBG(pm8001_ha,
                                pm8001_printk("The task is still in Lun \n"));
                /* The task is not in Lun or failed, reset the phy */
                case TMF_RESP_FUNC_FAILED:
                case TMF_RESP_FUNC_COMPLETE:
                        PM8001_EH_DBG(pm8001_ha,
                        pm8001_printk("The task is not in Lun or failed,"
                        " reset the phy \n"));
                        break;
                }
        }
        pm8001_printk(":rc= %d\n", rc);
        return rc;
}

/*  mandatory SAM-3, still need free task/ccb info, abord the specified task */
int pm8001_abort_task(struct sas_task *task)
{
        unsigned long flags;
        u32 tag = 0xdeadbeef;
        u32 device_id;
        struct domain_device *dev ;
        struct pm8001_hba_info *pm8001_ha = NULL;
        struct pm8001_ccb_info *ccb;
        struct scsi_lun lun;
        struct pm8001_device *pm8001_dev;
        struct pm8001_tmf_task tmf_task;
        int rc = TMF_RESP_FUNC_FAILED;
        if (unlikely(!task || !task->lldd_task || !task->dev))
                return rc;
        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);
        if (task->task_proto & SAS_PROTOCOL_SSP) {
                struct scsi_cmnd *cmnd = task->uldd_task;
                dev = task->dev;
                ccb = task->lldd_task;
                pm8001_dev = dev->lldd_dev;
                pm8001_ha = pm8001_find_ha_by_dev(dev);
                int_to_scsilun(cmnd->device->lun, &lun);
                rc = pm8001_find_tag(task, &tag);
                if (rc == 0) {
                        printk(KERN_INFO "No such tag in %s\n", __func__);
                        rc = TMF_RESP_FUNC_FAILED;
                        return rc;
                }
                device_id = pm8001_dev->device_id;
                PM8001_EH_DBG(pm8001_ha,
                        pm8001_printk("abort io to deviceid= %d\n", device_id));
                tmf_task.tmf = TMF_ABORT_TASK;
                tmf_task.tag_of_task_to_be_managed = tag;
                rc = pm8001_issue_ssp_tmf(dev, lun.scsi_lun, &tmf_task);
                pm8001_exec_internal_task_abort(pm8001_ha, pm8001_dev,
                        pm8001_dev->sas_device, 0, tag);
        } else if (task->task_proto & SAS_PROTOCOL_SATA ||
                task->task_proto & SAS_PROTOCOL_STP) {
                dev = task->dev;
                pm8001_dev = dev->lldd_dev;
                pm8001_ha = pm8001_find_ha_by_dev(dev);
                rc = pm8001_find_tag(task, &tag);
                if (rc == 0) {
                        printk(KERN_INFO "No such tag in %s\n", __func__);
                        rc = TMF_RESP_FUNC_FAILED;
                        return rc;
                }
                rc = pm8001_exec_internal_task_abort(pm8001_ha, pm8001_dev,
                        pm8001_dev->sas_device, 0, tag);
        } else if (task->task_proto & SAS_PROTOCOL_SMP) {
                /* SMP */
                dev = task->dev;
                pm8001_dev = dev->lldd_dev;
                pm8001_ha = pm8001_find_ha_by_dev(dev);
                rc = pm8001_find_tag(task, &tag);
                if (rc == 0) {
                        printk(KERN_INFO "No such tag in %s\n", __func__);
                        rc = TMF_RESP_FUNC_FAILED;
                        return rc;
                }
                rc = pm8001_exec_internal_task_abort(pm8001_ha, pm8001_dev,
                        pm8001_dev->sas_device, 0, tag);

        }
out:
        if (rc != TMF_RESP_FUNC_COMPLETE)
                pm8001_printk("rc= %d\n", rc);
        return rc;
}

int pm8001_abort_task_set(struct domain_device *dev, u8 *lun)
{
        int rc = TMF_RESP_FUNC_FAILED;
        struct pm8001_tmf_task tmf_task;

        tmf_task.tmf = TMF_ABORT_TASK_SET;
        rc = pm8001_issue_ssp_tmf(dev, lun, &tmf_task);
        return rc;
}

int pm8001_clear_aca(struct domain_device *dev, u8 *lun)
{
        int rc = TMF_RESP_FUNC_FAILED;
        struct pm8001_tmf_task tmf_task;

        tmf_task.tmf = TMF_CLEAR_ACA;
        rc = pm8001_issue_ssp_tmf(dev, lun, &tmf_task);

        return rc;
}

int pm8001_clear_task_set(struct domain_device *dev, u8 *lun)
{
        int rc = TMF_RESP_FUNC_FAILED;
        struct pm8001_tmf_task tmf_task;
        struct pm8001_device *pm8001_dev = dev->lldd_dev;
        struct pm8001_hba_info *pm8001_ha = pm8001_find_ha_by_dev(dev);

        PM8001_EH_DBG(pm8001_ha,
                pm8001_printk("I_T_L_Q clear task set[%x]\n",
                pm8001_dev->device_id));
        tmf_task.tmf = TMF_CLEAR_TASK_SET;
        rc = pm8001_issue_ssp_tmf(dev, lun, &tmf_task);
        return rc;
}