drivers/scsi/aic94xx/aic94xx_tmf.c - kernel/msm-4.9 - Gitiles

 /*
  * 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;
 	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);
 	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 (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;

 	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;
 		wait_for_completion_timeout(&tascb->completion,
 					    AIC94XX_SCB_TIMEOUT);
 		spin_lock_irqsave(&task->task_state_lock, flags);
 		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:
 		ASD_DPRINTK("%s: converting result 0x%x to TMF_RESP_FUNC_FAILED\n",
 			    __FUNCTION__, res);
 		res = TMF_RESP_FUNC_FAILED;
 		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;
 }
	/*
	* 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;
	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);
	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 (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;

	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;
	wait_for_completion_timeout(&tascb->completion,
	AIC94XX_SCB_TIMEOUT);
	spin_lock_irqsave(&task->task_state_lock, flags);
	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:
	ASD_DPRINTK("%s: converting result 0x%x to TMF_RESP_FUNC_FAILED\n",
	__FUNCTION__, res);
	res = TMF_RESP_FUNC_FAILED;
	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;
	}