RT-AC66 3.0.0.4.374.130 core

[tomato.git] / release / src-rt-6.x / linux / linux-2.6 / drivers / scsi / aic94xx / aic94xx_tmf.c

/*
 * Aic94xx Task Management Functions
 *
 * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
 *
 * This file is licensed under GPLv2.
 *
 * This file is part of the aic94xx driver.
 *
 * The aic94xx driver 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.
 *
 * The aic94xx driver 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 the aic94xx driver; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include <linux/spinlock.h>
#include "aic94xx.h"
#include "aic94xx_sas.h"
#include "aic94xx_hwi.h"

/* ---------- Internal enqueue ---------- */

static int asd_enqueue_internal(struct asd_ascb *ascb,
                void (*tasklet_complete)(struct asd_ascb *,
                                         struct done_list_struct *),
                                void (*timed_out)(unsigned long))
{
        int res;

        ascb->tasklet_complete = tasklet_complete;
        ascb->uldd_timer = 1;

        ascb->timer.data = (unsigned long) ascb;
        ascb->timer.function = timed_out;
        ascb->timer.expires = jiffies + AIC94XX_SCB_TIMEOUT;

        add_timer(&ascb->timer);

        res = asd_post_ascb_list(ascb->ha, ascb, 1);
        if (unlikely(res))
                del_timer(&ascb->timer);
        return res;
}

static inline void asd_timedout_common(unsigned long data)
{
        struct asd_ascb *ascb = (void *) data;
        struct asd_seq_data *seq = &ascb->ha->seq;
        unsigned long flags;

        spin_lock_irqsave(&seq->pend_q_lock, flags);
        seq->pending--;
        list_del_init(&ascb->list);
        spin_unlock_irqrestore(&seq->pend_q_lock, flags);
}

/* ---------- CLEAR NEXUS ---------- */

static void asd_clear_nexus_tasklet_complete(struct asd_ascb *ascb,
                                             struct done_list_struct *dl)
{
        ASD_DPRINTK("%s: here\n", __FUNCTION__);
        if (!del_timer(&ascb->timer)) {
                ASD_DPRINTK("%s: couldn't delete timer\n", __FUNCTION__);
                return;
        }
        ASD_DPRINTK("%s: opcode: 0x%x\n", __FUNCTION__, dl->opcode);
        ascb->uldd_task = (void *) (unsigned long) dl->opcode;
        complete(&ascb->completion);
}

static void asd_clear_nexus_timedout(unsigned long data)
{
        struct asd_ascb *ascb = (void *) data;

        ASD_DPRINTK("%s: here\n", __FUNCTION__);
        asd_timedout_common(data);
        ascb->uldd_task = (void *) TMF_RESP_FUNC_FAILED;
        complete(&ascb->completion);
}

#define CLEAR_NEXUS_PRE         \
        ASD_DPRINTK("%s: PRE\n", __FUNCTION__); \
        res = 1;                \
        ascb = asd_ascb_alloc_list(asd_ha, &res, GFP_KERNEL); \
        if (!ascb)              \
                return -ENOMEM; \
                                \
        scb = ascb->scb;        \
        scb->header.opcode = CLEAR_NEXUS

#define CLEAR_NEXUS_POST        \
        ASD_DPRINTK("%s: POST\n", __FUNCTION__); \
        res = asd_enqueue_internal(ascb, asd_clear_nexus_tasklet_complete, \
                                   asd_clear_nexus_timedout);              \
        if (res)                \
                goto out_err;   \
        ASD_DPRINTK("%s: clear nexus posted, waiting...\n", __FUNCTION__); \
        wait_for_completion(&ascb->completion); \
        res = (int) (unsigned long) ascb->uldd_task; \
        if (res == TC_NO_ERROR) \
                res = TMF_RESP_FUNC_COMPLETE;   \
out_err:                        \
        asd_ascb_free(ascb);    \
        return res

int asd_clear_nexus_ha(struct sas_ha_struct *sas_ha)
{
        struct asd_ha_struct *asd_ha = sas_ha->lldd_ha;
        struct asd_ascb *ascb;
        struct scb *scb;
        int res;

        CLEAR_NEXUS_PRE;
        scb->clear_nexus.nexus = NEXUS_ADAPTER;
        CLEAR_NEXUS_POST;
}

int asd_clear_nexus_port(struct asd_sas_port *port)
{
        struct asd_ha_struct *asd_ha = port->ha->lldd_ha;
        struct asd_ascb *ascb;
        struct scb *scb;
        int res;

        CLEAR_NEXUS_PRE;
        scb->clear_nexus.nexus = NEXUS_PORT;
        scb->clear_nexus.conn_mask = port->phy_mask;
        CLEAR_NEXUS_POST;
}

#if 0
static int asd_clear_nexus_I_T(struct domain_device *dev)
{
        struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
        struct asd_ascb *ascb;
        struct scb *scb;
        int res;

        CLEAR_NEXUS_PRE;
        scb->clear_nexus.nexus = NEXUS_I_T;
        scb->clear_nexus.flags = SEND_Q | EXEC_Q | NOTINQ;
        if (dev->tproto)
                scb->clear_nexus.flags |= SUSPEND_TX;
        scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
                                                   dev->lldd_dev);
        CLEAR_NEXUS_POST;
}
#endif

static int asd_clear_nexus_I_T_L(struct domain_device *dev, u8 *lun)
{
        struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
        struct asd_ascb *ascb;
        struct scb *scb;
        int res;

        CLEAR_NEXUS_PRE;
        scb->clear_nexus.nexus = NEXUS_I_T_L;
        scb->clear_nexus.flags = SEND_Q | EXEC_Q | NOTINQ;
        if (dev->tproto)
                scb->clear_nexus.flags |= SUSPEND_TX;
        memcpy(scb->clear_nexus.ssp_task.lun, lun, 8);
        scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
                                                   dev->lldd_dev);
        CLEAR_NEXUS_POST;
}

static int asd_clear_nexus_tag(struct sas_task *task)
{
        struct asd_ha_struct *asd_ha = task->dev->port->ha->lldd_ha;
        struct asd_ascb *tascb = task->lldd_task;
        struct asd_ascb *ascb;
        struct scb *scb;
        int res;

        CLEAR_NEXUS_PRE;
        scb->clear_nexus.nexus = NEXUS_TAG;
        memcpy(scb->clear_nexus.ssp_task.lun, task->ssp_task.LUN, 8);
        scb->clear_nexus.ssp_task.tag = tascb->tag;
        if (task->dev->tproto)
                scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
                                                          task->dev->lldd_dev);
        CLEAR_NEXUS_POST;
}

static int asd_clear_nexus_index(struct sas_task *task)
{
        struct asd_ha_struct *asd_ha = task->dev->port->ha->lldd_ha;
        struct asd_ascb *tascb = task->lldd_task;
        struct asd_ascb *ascb;
        struct scb *scb;
        int res;

        CLEAR_NEXUS_PRE;
        scb->clear_nexus.nexus = NEXUS_TRANS_CX;
        if (task->dev->tproto)
                scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
                                                          task->dev->lldd_dev);
        scb->clear_nexus.index = cpu_to_le16(tascb->tc_index);
        CLEAR_NEXUS_POST;
}

/* ---------- TMFs ---------- */

static void asd_tmf_timedout(unsigned long data)
{
        struct asd_ascb *ascb = (void *) data;

        ASD_DPRINTK("tmf timed out\n");
        asd_timedout_common(data);
        ascb->uldd_task = (void *) TMF_RESP_FUNC_FAILED;
        complete(&ascb->completion);
}

static int asd_get_tmf_resp_tasklet(struct asd_ascb *ascb,
                                    struct done_list_struct *dl)
{
        struct asd_ha_struct *asd_ha = ascb->ha;
        unsigned long flags;
        struct tc_resp_sb_struct {
                __le16 index_escb;
                u8     len_lsb;
                u8     flags;
        } __attribute__ ((packed)) *resp_sb = (void *) dl->status_block;

        int  edb_id = ((resp_sb->flags & 0x70) >> 4)-1;
        struct asd_ascb *escb;
        struct asd_dma_tok *edb;
        struct ssp_frame_hdr *fh;
        struct ssp_response_iu   *ru;
        int res = TMF_RESP_FUNC_FAILED;

        ASD_DPRINTK("tmf resp tasklet\n");

        spin_lock_irqsave(&asd_ha->seq.tc_index_lock, flags);
        escb = asd_tc_index_find(&asd_ha->seq,
                                 (int)le16_to_cpu(resp_sb->index_escb));
        spin_unlock_irqrestore(&asd_ha->seq.tc_index_lock, flags);

        if (!escb) {
                ASD_DPRINTK("Uh-oh! No escb for this dl?!\n");
                return res;
        }

        edb = asd_ha->seq.edb_arr[edb_id + escb->edb_index];
        ascb->tag = *(__be16 *)(edb->vaddr+4);
        fh = edb->vaddr + 16;
        ru = edb->vaddr + 16 + sizeof(*fh);
        res = ru->status;
        if (ru->datapres == 1)    /* Response data present */
                res = ru->resp_data[3];
#if 0
        ascb->tag = fh->tag;
#endif
        ascb->tag_valid = 1;

        asd_invalidate_edb(escb, edb_id);
        return res;
}

static void asd_tmf_tasklet_complete(struct asd_ascb *ascb,
                                     struct done_list_struct *dl)
{
        if (!del_timer(&ascb->timer))
                return;

        ASD_DPRINTK("tmf tasklet complete\n");

        if (dl->opcode == TC_SSP_RESP)
                ascb->uldd_task = (void *) (unsigned long)
                        asd_get_tmf_resp_tasklet(ascb, dl);
        else
                ascb->uldd_task = (void *) 0xFF00 + (unsigned long) dl->opcode;

        complete(&ascb->completion);
}

static inline int asd_clear_nexus(struct sas_task *task)
{
        int res = TMF_RESP_FUNC_FAILED;
        int leftover;
        struct asd_ascb *tascb = task->lldd_task;
        unsigned long flags;

        ASD_DPRINTK("task not done, clearing nexus\n");
        if (tascb->tag_valid)
                res = asd_clear_nexus_tag(task);
        else
                res = asd_clear_nexus_index(task);
        leftover = wait_for_completion_timeout(&tascb->completion,
                                               AIC94XX_SCB_TIMEOUT);
        ASD_DPRINTK("came back from clear nexus\n");
        spin_lock_irqsave(&task->task_state_lock, flags);
        if (leftover < 1)
                res = TMF_RESP_FUNC_FAILED;
        if (task->task_state_flags & SAS_TASK_STATE_DONE)
                res = TMF_RESP_FUNC_COMPLETE;
        spin_unlock_irqrestore(&task->task_state_lock, flags);

        return res;
}

/**
 * asd_abort_task -- ABORT TASK TMF
 * @task: the task to be aborted
 *
 * Before calling ABORT TASK the task state flags should be ORed with
 * SAS_TASK_STATE_ABORTED (unless SAS_TASK_STATE_DONE is set) under
 * the task_state_lock IRQ spinlock, then ABORT TASK *must* be called.
 *
 * Implements the ABORT TASK TMF, I_T_L_Q nexus.
 * Returns: SAS TMF responses (see sas_task.h),
 *          -ENOMEM,
 *          -SAS_QUEUE_FULL.
 *
 * When ABORT TASK returns, the caller of ABORT TASK checks first the
 * task->task_state_flags, and then the return value of ABORT TASK.
 *
 * If the task has task state bit SAS_TASK_STATE_DONE set, then the
 * task was completed successfully prior to it being aborted.  The
 * caller of ABORT TASK has responsibility to call task->task_done()
 * xor free the task, depending on their framework.  The return code
 * is TMF_RESP_FUNC_FAILED in this case.
 *
 * Else the SAS_TASK_STATE_DONE bit is not set,
 *      If the return code is TMF_RESP_FUNC_COMPLETE, then
 *              the task was aborted successfully.  The caller of
 *              ABORT TASK has responsibility to call task->task_done()
 *              to finish the task, xor free the task depending on their
 *              framework.
 *      else
 *              the ABORT TASK returned some kind of error. The task
 *              was _not_ cancelled.  Nothing can be assumed.
 *              The caller of ABORT TASK may wish to retry.
 */
int asd_abort_task(struct sas_task *task)
{
        struct asd_ascb *tascb = task->lldd_task;
        struct asd_ha_struct *asd_ha = tascb->ha;
        int res = 1;
        unsigned long flags;
        struct asd_ascb *ascb = NULL;
        struct scb *scb;
        int leftover;

        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);
                res = TMF_RESP_FUNC_COMPLETE;
                ASD_DPRINTK("%s: task 0x%p done\n", __FUNCTION__, task);
                goto out_done;
        }
        spin_unlock_irqrestore(&task->task_state_lock, flags);

        ascb = asd_ascb_alloc_list(asd_ha, &res, GFP_KERNEL);
        if (!ascb)
                return -ENOMEM;
        scb = ascb->scb;

        scb->header.opcode = ABORT_TASK;

        switch (task->task_proto) {
        case SATA_PROTO:
        case SAS_PROTO_STP:
                scb->abort_task.proto_conn_rate = (1 << 5); /* STP */
                break;
        case SAS_PROTO_SSP:
                scb->abort_task.proto_conn_rate  = (1 << 4); /* SSP */
                scb->abort_task.proto_conn_rate |= task->dev->linkrate;
                break;
        case SAS_PROTO_SMP:
                break;
        default:
                break;
        }

        if (task->task_proto == SAS_PROTO_SSP) {
                scb->abort_task.ssp_frame.frame_type = SSP_TASK;
                memcpy(scb->abort_task.ssp_frame.hashed_dest_addr,
                       task->dev->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
                memcpy(scb->abort_task.ssp_frame.hashed_src_addr,
                       task->dev->port->ha->hashed_sas_addr,
                       HASHED_SAS_ADDR_SIZE);
                scb->abort_task.ssp_frame.tptt = cpu_to_be16(0xFFFF);

                memcpy(scb->abort_task.ssp_task.lun, task->ssp_task.LUN, 8);
                scb->abort_task.ssp_task.tmf = TMF_ABORT_TASK;
                scb->abort_task.ssp_task.tag = cpu_to_be16(0xFFFF);
        }

        scb->abort_task.sister_scb = cpu_to_le16(0xFFFF);
        scb->abort_task.conn_handle = cpu_to_le16(
                (u16)(unsigned long)task->dev->lldd_dev);
        scb->abort_task.retry_count = 1;
        scb->abort_task.index = cpu_to_le16((u16)tascb->tc_index);
        scb->abort_task.itnl_to = cpu_to_le16(ITNL_TIMEOUT_CONST);

        res = asd_enqueue_internal(ascb, asd_tmf_tasklet_complete,
                                   asd_tmf_timedout);
        if (res)
                goto out;
        wait_for_completion(&ascb->completion);
        ASD_DPRINTK("tmf came back\n");

        res = (int) (unsigned long) ascb->uldd_task;
        tascb->tag = ascb->tag;
        tascb->tag_valid = ascb->tag_valid;

        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);
                res = TMF_RESP_FUNC_COMPLETE;
                ASD_DPRINTK("%s: task 0x%p done\n", __FUNCTION__, task);
                goto out_done;
        }
        spin_unlock_irqrestore(&task->task_state_lock, flags);

        switch (res) {
        /* The task to be aborted has been sent to the device.
         * We got a Response IU for the ABORT TASK TMF. */
        case TC_NO_ERROR + 0xFF00:
        case TMF_RESP_FUNC_COMPLETE:
        case TMF_RESP_FUNC_FAILED:
                res = asd_clear_nexus(task);
                break;
        case TMF_RESP_INVALID_FRAME:
        case TMF_RESP_OVERLAPPED_TAG:
        case TMF_RESP_FUNC_ESUPP:
        case TMF_RESP_NO_LUN:
                goto out_done; break;
        }
        /* In the following we assume that the managing layer
         * will _never_ make a mistake, when issuing ABORT TASK.
         */
        switch (res) {
        default:
                res = asd_clear_nexus(task);
                /* fallthrough */
        case TC_NO_ERROR + 0xFF00:
        case TMF_RESP_FUNC_COMPLETE:
                break;
        /* The task hasn't been sent to the device xor we never got
         * a (sane) Response IU for the ABORT TASK TMF.
         */
        case TF_NAK_RECV + 0xFF00:
                res = TMF_RESP_INVALID_FRAME;
                break;
        case TF_TMF_TASK_DONE + 0xFF00: /* done but not reported yet */
                res = TMF_RESP_FUNC_FAILED;
                leftover = wait_for_completion_timeout(&tascb->completion,
                                                       AIC94XX_SCB_TIMEOUT);
                spin_lock_irqsave(&task->task_state_lock, flags);
                if (leftover < 1)
                        res = TMF_RESP_FUNC_FAILED;
                if (task->task_state_flags & SAS_TASK_STATE_DONE)
                        res = TMF_RESP_FUNC_COMPLETE;
                spin_unlock_irqrestore(&task->task_state_lock, flags);
                goto out_done;
        case TF_TMF_NO_TAG + 0xFF00:
        case TF_TMF_TAG_FREE + 0xFF00: /* the tag is in the free list */
        case TF_TMF_NO_CONN_HANDLE + 0xFF00: /* no such device */
                res = TMF_RESP_FUNC_COMPLETE;
                goto out_done;
        case TF_TMF_NO_CTX + 0xFF00: /* not in seq, or proto != SSP */
                res = TMF_RESP_FUNC_ESUPP;
                goto out;
        }
out_done:
        if (res == TMF_RESP_FUNC_COMPLETE) {
                task->lldd_task = NULL;
                mb();
                asd_ascb_free(tascb);
        }
out:
        asd_ascb_free(ascb);
        ASD_DPRINTK("task 0x%p aborted, res: 0x%x\n", task, res);
        return res;
}

/**
 * asd_initiate_ssp_tmf -- send a TMF to an I_T_L or I_T_L_Q nexus
 * @dev: pointer to struct domain_device of interest
 * @lun: pointer to u8[8] which is the LUN
 * @tmf: the TMF to be performed (see sas_task.h or the SAS spec)
 * @index: the transaction context of the task to be queried if QT TMF
 *
 * This function is used to send ABORT TASK SET, CLEAR ACA,
 * CLEAR TASK SET, LU RESET and QUERY TASK TMFs.
 *
 * No SCBs should be queued to the I_T_L nexus when this SCB is
 * pending.
 *
 * Returns: TMF response code (see sas_task.h or the SAS spec)
 */
static int asd_initiate_ssp_tmf(struct domain_device *dev, u8 *lun,
                                int tmf, int index)
{
        struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
        struct asd_ascb *ascb;
        int res = 1;
        struct scb *scb;

        if (!(dev->tproto & SAS_PROTO_SSP))
                return TMF_RESP_FUNC_ESUPP;

        ascb = asd_ascb_alloc_list(asd_ha, &res, GFP_KERNEL);
        if (!ascb)
                return -ENOMEM;
        scb = ascb->scb;

        if (tmf == TMF_QUERY_TASK)
                scb->header.opcode = QUERY_SSP_TASK;
        else
                scb->header.opcode = INITIATE_SSP_TMF;

        scb->ssp_tmf.proto_conn_rate  = (1 << 4); /* SSP */
        scb->ssp_tmf.proto_conn_rate |= dev->linkrate;
        /* SSP frame header */
        scb->ssp_tmf.ssp_frame.frame_type = SSP_TASK;
        memcpy(scb->ssp_tmf.ssp_frame.hashed_dest_addr,
               dev->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
        memcpy(scb->ssp_tmf.ssp_frame.hashed_src_addr,
               dev->port->ha->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
        scb->ssp_tmf.ssp_frame.tptt = cpu_to_be16(0xFFFF);
        /* SSP Task IU */
        memcpy(scb->ssp_tmf.ssp_task.lun, lun, 8);
        scb->ssp_tmf.ssp_task.tmf = tmf;

        scb->ssp_tmf.sister_scb = cpu_to_le16(0xFFFF);
        scb->ssp_tmf.conn_handle= cpu_to_le16((u16)(unsigned long)
                                              dev->lldd_dev);
        scb->ssp_tmf.retry_count = 1;
        scb->ssp_tmf.itnl_to = cpu_to_le16(ITNL_TIMEOUT_CONST);
        if (tmf == TMF_QUERY_TASK)
                scb->ssp_tmf.index = cpu_to_le16(index);

        res = asd_enqueue_internal(ascb, asd_tmf_tasklet_complete,
                                   asd_tmf_timedout);
        if (res)
                goto out_err;
        wait_for_completion(&ascb->completion);
        res = (int) (unsigned long) ascb->uldd_task;

        switch (res) {
        case TC_NO_ERROR + 0xFF00:
                res = TMF_RESP_FUNC_COMPLETE;
                break;
        case TF_NAK_RECV + 0xFF00:
                res = TMF_RESP_INVALID_FRAME;
                break;
        case TF_TMF_TASK_DONE + 0xFF00:
                res = TMF_RESP_FUNC_FAILED;
                break;
        case TF_TMF_NO_TAG + 0xFF00:
        case TF_TMF_TAG_FREE + 0xFF00: /* the tag is in the free list */
        case TF_TMF_NO_CONN_HANDLE + 0xFF00: /* no such device */
                res = TMF_RESP_FUNC_COMPLETE;
                break;
        case TF_TMF_NO_CTX + 0xFF00: /* not in seq, or proto != SSP */
                res = TMF_RESP_FUNC_ESUPP;
                break;
        default:
                /* Allow TMF response codes to propagate upwards */
                break;
        }
out_err:
        asd_ascb_free(ascb);
        return res;
}

int asd_abort_task_set(struct domain_device *dev, u8 *lun)
{
        int res = asd_initiate_ssp_tmf(dev, lun, TMF_ABORT_TASK_SET, 0);

        if (res == TMF_RESP_FUNC_COMPLETE)
                asd_clear_nexus_I_T_L(dev, lun);
        return res;
}

int asd_clear_aca(struct domain_device *dev, u8 *lun)
{
        int res = asd_initiate_ssp_tmf(dev, lun, TMF_CLEAR_ACA, 0);

        if (res == TMF_RESP_FUNC_COMPLETE)
                asd_clear_nexus_I_T_L(dev, lun);
        return res;
}

int asd_clear_task_set(struct domain_device *dev, u8 *lun)
{
        int res = asd_initiate_ssp_tmf(dev, lun, TMF_CLEAR_TASK_SET, 0);

        if (res == TMF_RESP_FUNC_COMPLETE)
                asd_clear_nexus_I_T_L(dev, lun);
        return res;
}

int asd_lu_reset(struct domain_device *dev, u8 *lun)
{
        int res = asd_initiate_ssp_tmf(dev, lun, TMF_LU_RESET, 0);

        if (res == TMF_RESP_FUNC_COMPLETE)
                asd_clear_nexus_I_T_L(dev, lun);
        return res;
}

/**
 * asd_query_task -- send a QUERY TASK TMF to an I_T_L_Q nexus
 * task: pointer to sas_task struct of interest
 *
 * Returns: TMF_RESP_FUNC_COMPLETE if the task is not in the task set,
 * or TMF_RESP_FUNC_SUCC if the task is in the task set.
 *
 * Normally the management layer sets the task to aborted state,
 * and then calls query task and then abort task.
 */
int asd_query_task(struct sas_task *task)
{
        struct asd_ascb *ascb = task->lldd_task;
        int index;

        if (ascb) {
                index = ascb->tc_index;
                return asd_initiate_ssp_tmf(task->dev, task->ssp_task.LUN,
                                            TMF_QUERY_TASK, index);
        }
        return TMF_RESP_FUNC_COMPLETE;
}