Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 714 insertions, 0 deletions

diff --git a/kernel/drivers/scsi/aic94xx/aic94xx_tmf.c b/kernel/drivers/scsi/aic94xx/aic94xx_tmf.c
new file mode 100644
index 000000000..d4c35df3d
--- /dev/null
+++ b/kernel/drivers/scsi/aic94xx/aic94xx_tmf.c
@@ -0,0 +1,714 @@
+/*
+ * 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 <linux/gfp.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;
+}
+
+/* ---------- CLEAR NEXUS ---------- */
+
+struct tasklet_completion_status {
+	int	dl_opcode;
+	int	tmf_state;
+	u8	tag_valid:1;
+	__be16	tag;
+};
+
+#define DECLARE_TCS(tcs) \
+	struct tasklet_completion_status tcs = { \
+		.dl_opcode = 0, \
+		.tmf_state = 0, \
+		.tag_valid = 0, \
+		.tag = 0, \
+	}
+
+
+static void asd_clear_nexus_tasklet_complete(struct asd_ascb *ascb,
+					     struct done_list_struct *dl)
+{
+	struct tasklet_completion_status *tcs = ascb->uldd_task;
+	ASD_DPRINTK("%s: here\n", __func__);
+	if (!del_timer(&ascb->timer)) {
+		ASD_DPRINTK("%s: couldn't delete timer\n", __func__);
+		return;
+	}
+	ASD_DPRINTK("%s: opcode: 0x%x\n", __func__, dl->opcode);
+	tcs->dl_opcode = dl->opcode;
+	complete(ascb->completion);
+	asd_ascb_free(ascb);
+}
+
+static void asd_clear_nexus_timedout(unsigned long data)
+{
+	struct asd_ascb *ascb = (void *)data;
+	struct tasklet_completion_status *tcs = ascb->uldd_task;
+
+	ASD_DPRINTK("%s: here\n", __func__);
+	tcs->dl_opcode = TMF_RESP_FUNC_FAILED;
+	complete(ascb->completion);
+}
+
+#define CLEAR_NEXUS_PRE         \
+	struct asd_ascb *ascb; \
+	struct scb *scb; \
+	int res; \
+	DECLARE_COMPLETION_ONSTACK(completion); \
+	DECLARE_TCS(tcs); \
+		\
+	ASD_DPRINTK("%s: PRE\n", __func__); \
+        res = 1;                \
+	ascb = asd_ascb_alloc_list(asd_ha, &res, GFP_KERNEL); \
+	if (!ascb)              \
+		return -ENOMEM; \
+                                \
+	ascb->completion = &completion; \
+	ascb->uldd_task = &tcs; \
+	scb = ascb->scb;        \
+	scb->header.opcode = CLEAR_NEXUS
+
+#define CLEAR_NEXUS_POST        \
+	ASD_DPRINTK("%s: POST\n", __func__); \
+	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", __func__); \
+	wait_for_completion(&completion); \
+	res = tcs.dl_opcode; \
+	if (res == TC_NO_ERROR) \
+		res = TMF_RESP_FUNC_COMPLETE;   \
+	return res; \
+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;
+
+	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;
+
+	CLEAR_NEXUS_PRE;
+	scb->clear_nexus.nexus = NEXUS_PORT;
+	scb->clear_nexus.conn_mask = port->phy_mask;
+	CLEAR_NEXUS_POST;
+}
+
+enum clear_nexus_phase {
+	NEXUS_PHASE_PRE,
+	NEXUS_PHASE_POST,
+	NEXUS_PHASE_RESUME,
+};
+
+static int asd_clear_nexus_I_T(struct domain_device *dev,
+			       enum clear_nexus_phase phase)
+{
+	struct asd_ha_struct *asd_ha = dev->port->ha->lldd_ha;
+
+	CLEAR_NEXUS_PRE;
+	scb->clear_nexus.nexus = NEXUS_I_T;
+	switch (phase) {
+	case NEXUS_PHASE_PRE:
+		scb->clear_nexus.flags = EXEC_Q | SUSPEND_TX;
+		break;
+	case NEXUS_PHASE_POST:
+		scb->clear_nexus.flags = SEND_Q | NOTINQ;
+		break;
+	case NEXUS_PHASE_RESUME:
+		scb->clear_nexus.flags = RESUME_TX;
+	}
+	scb->clear_nexus.conn_handle = cpu_to_le16((u16)(unsigned long)
+						   dev->lldd_dev);
+	CLEAR_NEXUS_POST;
+}
+
+int asd_I_T_nexus_reset(struct domain_device *dev)
+{
+	int res, tmp_res, i;
+	struct sas_phy *phy = sas_get_local_phy(dev);
+	/* Standard mandates link reset for ATA  (type 0) and
+	 * hard reset for SSP (type 1) */
+	int reset_type = (dev->dev_type == SAS_SATA_DEV ||
+			  (dev->tproto & SAS_PROTOCOL_STP)) ? 0 : 1;
+
+	asd_clear_nexus_I_T(dev, NEXUS_PHASE_PRE);
+	/* send a hard reset */
+	ASD_DPRINTK("sending %s reset to %s\n",
+		    reset_type ? "hard" : "soft", dev_name(&phy->dev));
+	res = sas_phy_reset(phy, reset_type);
+	if (res == TMF_RESP_FUNC_COMPLETE || res == -ENODEV) {
+		/* wait for the maximum settle time */
+		msleep(500);
+		/* clear all outstanding commands (keep nexus suspended) */
+		asd_clear_nexus_I_T(dev, NEXUS_PHASE_POST);
+	}
+	for (i = 0 ; i < 3; i++) {
+		tmp_res = asd_clear_nexus_I_T(dev, NEXUS_PHASE_RESUME);
+		if (tmp_res == TC_RESUME)
+			goto out;
+		msleep(500);
+	}
+
+	/* This is a bit of a problem:  the sequencer is still suspended
+	 * and is refusing to resume.  Hope it will resume on a bigger hammer
+	 * or the disk is lost */
+	dev_printk(KERN_ERR, &phy->dev,
+		   "Failed to resume nexus after reset 0x%x\n", tmp_res);
+
+	res = TMF_RESP_FUNC_FAILED;
+ out:
+	sas_put_local_phy(phy);
+	return res;
+}
+
+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;
+
+	CLEAR_NEXUS_PRE;
+	scb->clear_nexus.nexus = NEXUS_I_T_L;
+	scb->clear_nexus.flags = SEND_Q | EXEC_Q | NOTINQ;
+	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;
+
+	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;
+
+	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;
+	struct tasklet_completion_status *tcs = ascb->uldd_task;
+
+	ASD_DPRINTK("tmf timed out\n");
+	tcs->tmf_state = 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)
+{
+	struct tasklet_completion_status *tcs;
+
+	if (!del_timer(&ascb->timer))
+		return;
+
+	tcs = ascb->uldd_task;
+	ASD_DPRINTK("tmf tasklet complete\n");
+
+	tcs->dl_opcode = dl->opcode;
+
+	if (dl->opcode == TC_SSP_RESP) {
+		tcs->tmf_state = asd_get_tmf_resp_tasklet(ascb, dl);
+		tcs->tag_valid = ascb->tag_valid;
+		tcs->tag = ascb->tag;
+	}
+
+	complete(ascb->completion);
+	asd_ascb_free(ascb);
+}
+
+static int asd_clear_nexus(struct sas_task *task)
+{
+	int res = TMF_RESP_FUNC_FAILED;
+	int leftover;
+	struct asd_ascb *tascb = task->lldd_task;
+	DECLARE_COMPLETION_ONSTACK(completion);
+	unsigned long flags;
+
+	tascb->completion = &completion;
+
+	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(&completion,
+					       AIC94XX_SCB_TIMEOUT);
+	tascb->completion = NULL;
+	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;
+	DECLARE_TCS(tcs);
+	DECLARE_COMPLETION_ONSTACK(completion);
+	DECLARE_COMPLETION_ONSTACK(tascb_completion);
+
+	tascb->completion = &tascb_completion;
+
+	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", __func__, 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;
+
+	ascb->uldd_task = &tcs;
+	ascb->completion = &completion;
+	scb = ascb->scb;
+	scb->header.opcode = SCB_ABORT_TASK;
+
+	switch (task->task_proto) {
+	case SAS_PROTOCOL_SATA:
+	case SAS_PROTOCOL_STP:
+		scb->abort_task.proto_conn_rate = (1 << 5); /* STP */
+		break;
+	case SAS_PROTOCOL_SSP:
+		scb->abort_task.proto_conn_rate  = (1 << 4); /* SSP */
+		scb->abort_task.proto_conn_rate |= task->dev->linkrate;
+		break;
+	case SAS_PROTOCOL_SMP:
+		break;
+	default:
+		break;
+	}
+
+	if (task->task_proto == SAS_PROTOCOL_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_free;
+	wait_for_completion(&completion);
+	ASD_DPRINTK("tmf came back\n");
+
+	tascb->tag = tcs.tag;
+	tascb->tag_valid = tcs.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", __func__, task);
+		goto out_done;
+	}
+	spin_unlock_irqrestore(&task->task_state_lock, flags);
+
+	if (tcs.dl_opcode == TC_SSP_RESP) {
+		/* The task to be aborted has been sent to the device.
+		 * We got a Response IU for the ABORT TASK TMF. */
+		if (tcs.tmf_state == TMF_RESP_FUNC_COMPLETE)
+			res = asd_clear_nexus(task);
+		else
+			res = tcs.tmf_state;
+	} else if (tcs.dl_opcode == TC_NO_ERROR &&
+		   tcs.tmf_state == TMF_RESP_FUNC_FAILED) {
+		/* timeout */
+		res = TMF_RESP_FUNC_FAILED;
+	} else {
+		/* In the following we assume that the managing layer
+		 * will _never_ make a mistake, when issuing ABORT
+		 * TASK.
+		 */
+		switch (tcs.dl_opcode) {
+		default:
+			res = asd_clear_nexus(task);
+			/* fallthrough */
+		case TC_NO_ERROR:
+			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:
+			res = TMF_RESP_INVALID_FRAME;
+			break;
+		case TF_TMF_TASK_DONE:	/* 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);
+			break;
+		case TF_TMF_NO_TAG:
+		case TF_TMF_TAG_FREE: /* the tag is in the free list */
+		case TF_TMF_NO_CONN_HANDLE: /* no such device */
+			res = TMF_RESP_FUNC_COMPLETE;
+			break;
+		case TF_TMF_NO_CTX: /* not in seq, or proto != SSP */
+			res = TMF_RESP_FUNC_ESUPP;
+			break;
+		}
+	}
+ out_done:
+	tascb->completion = NULL;
+	if (res == TMF_RESP_FUNC_COMPLETE) {
+		task->lldd_task = NULL;
+		mb();
+		asd_ascb_free(tascb);
+	}
+	ASD_DPRINTK("task 0x%p aborted, res: 0x%x\n", task, res);
+	return res;
+
+ out_free:
+	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;
+	DECLARE_COMPLETION_ONSTACK(completion);
+	DECLARE_TCS(tcs);
+
+	if (!(dev->tproto & SAS_PROTOCOL_SSP))
+		return TMF_RESP_FUNC_ESUPP;
+
+	ascb = asd_ascb_alloc_list(asd_ha, &res, GFP_KERNEL);
+	if (!ascb)
+		return -ENOMEM;
+
+	ascb->completion = &completion;
+	ascb->uldd_task = &tcs;
+	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(&completion);
+
+	switch (tcs.dl_opcode) {
+	case TC_NO_ERROR:
+		res = TMF_RESP_FUNC_COMPLETE;
+		break;
+	case TF_NAK_RECV:
+		res = TMF_RESP_INVALID_FRAME;
+		break;
+	case TF_TMF_TASK_DONE:
+		res = TMF_RESP_FUNC_FAILED;
+		break;
+	case TF_TMF_NO_TAG:
+	case TF_TMF_TAG_FREE: /* the tag is in the free list */
+	case TF_TMF_NO_CONN_HANDLE: /* no such device */
+		res = TMF_RESP_FUNC_COMPLETE;
+		break;
+	case TF_TMF_NO_CTX: /* not in seq, or proto != SSP */
+		res = TMF_RESP_FUNC_ESUPP;
+		break;
+	default:
+		/* Allow TMF response codes to propagate upwards */
+		res = tcs.dl_opcode;
+		break;
+	}
+	return res;
+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;
+}