Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 1323 insertions, 0 deletions

diff --git a/drivers/scsi/isci/task.c b/drivers/scsi/isci/task.c
new file mode 100644
index 00000000..374254ed
--- /dev/null
+++ b/drivers/scsi/isci/task.c
@@ -0,0 +1,1323 @@
+/*
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ * The full GNU General Public License is included in this distribution
+ * in the file called LICENSE.GPL.
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in
+ *     the documentation and/or other materials provided with the
+ *     distribution.
+ *   * Neither the name of Intel Corporation nor the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * 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 MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * 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 DAMAGE.
+ */
+
+#include <linux/completion.h>
+#include <linux/irqflags.h>
+#include "sas.h"
+#include <scsi/libsas.h>
+#include "remote_device.h"
+#include "remote_node_context.h"
+#include "isci.h"
+#include "request.h"
+#include "task.h"
+#include "host.h"
+
+/**
+* isci_task_refuse() - complete the request to the upper layer driver in
+*     the case where an I/O needs to be completed back in the submit path.
+* @ihost: host on which the the request was queued
+* @task: request to complete
+* @response: response code for the completed task.
+* @status: status code for the completed task.
+*
+*/
+static void isci_task_refuse(struct isci_host *ihost, struct sas_task *task,
+			     enum service_response response,
+			     enum exec_status status)
+
+{
+	enum isci_completion_selection disposition;
+
+	disposition = isci_perform_normal_io_completion;
+	disposition = isci_task_set_completion_status(task, response, status,
+						      disposition);
+
+	/* Tasks aborted specifically by a call to the lldd_abort_task
+	 * function should not be completed to the host in the regular path.
+	 */
+	switch (disposition) {
+	case isci_perform_normal_io_completion:
+		/* Normal notification (task_done) */
+		dev_dbg(&ihost->pdev->dev,
+			"%s: Normal - task = %p, response=%d, "
+			"status=%d\n",
+			__func__, task, response, status);
+
+		task->lldd_task = NULL;
+		task->task_done(task);
+		break;
+
+	case isci_perform_aborted_io_completion:
+		/*
+		 * No notification because this request is already in the
+		 * abort path.
+		 */
+		dev_dbg(&ihost->pdev->dev,
+			"%s: Aborted - task = %p, response=%d, "
+			"status=%d\n",
+			__func__, task, response, status);
+		break;
+
+	case isci_perform_error_io_completion:
+		/* Use sas_task_abort */
+		dev_dbg(&ihost->pdev->dev,
+			"%s: Error - task = %p, response=%d, "
+			"status=%d\n",
+			__func__, task, response, status);
+		sas_task_abort(task);
+		break;
+
+	default:
+		dev_dbg(&ihost->pdev->dev,
+			"%s: isci task notification default case!",
+			__func__);
+		sas_task_abort(task);
+		break;
+	}
+}
+
+#define for_each_sas_task(num, task) \
+	for (; num > 0; num--,\
+	     task = list_entry(task->list.next, struct sas_task, list))
+
+
+static inline int isci_device_io_ready(struct isci_remote_device *idev,
+				       struct sas_task *task)
+{
+	return idev ? test_bit(IDEV_IO_READY, &idev->flags) ||
+		      (test_bit(IDEV_IO_NCQERROR, &idev->flags) &&
+		       isci_task_is_ncq_recovery(task))
+		    : 0;
+}
+/**
+ * isci_task_execute_task() - This function is one of the SAS Domain Template
+ *    functions. This function is called by libsas to send a task down to
+ *    hardware.
+ * @task: This parameter specifies the SAS task to send.
+ * @num: This parameter specifies the number of tasks to queue.
+ * @gfp_flags: This parameter specifies the context of this call.
+ *
+ * status, zero indicates success.
+ */
+int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags)
+{
+	struct isci_host *ihost = dev_to_ihost(task->dev);
+	struct isci_remote_device *idev;
+	unsigned long flags;
+	bool io_ready;
+	u16 tag;
+
+	dev_dbg(&ihost->pdev->dev, "%s: num=%d\n", __func__, num);
+
+	for_each_sas_task(num, task) {
+		enum sci_status status = SCI_FAILURE;
+
+		spin_lock_irqsave(&ihost->scic_lock, flags);
+		idev = isci_lookup_device(task->dev);
+		io_ready = isci_device_io_ready(idev, task);
+		tag = isci_alloc_tag(ihost);
+		spin_unlock_irqrestore(&ihost->scic_lock, flags);
+
+		dev_dbg(&ihost->pdev->dev,
+			"task: %p, num: %d dev: %p idev: %p:%#lx cmd = %p\n",
+			task, num, task->dev, idev, idev ? idev->flags : 0,
+			task->uldd_task);
+
+		if (!idev) {
+			isci_task_refuse(ihost, task, SAS_TASK_UNDELIVERED,
+					 SAS_DEVICE_UNKNOWN);
+		} else if (!io_ready || tag == SCI_CONTROLLER_INVALID_IO_TAG) {
+			/* Indicate QUEUE_FULL so that the scsi midlayer
+			 * retries.
+			  */
+			isci_task_refuse(ihost, task, SAS_TASK_COMPLETE,
+					 SAS_QUEUE_FULL);
+		} else {
+			/* There is a device and it's ready for I/O. */
+			spin_lock_irqsave(&task->task_state_lock, flags);
+
+			if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
+				/* The I/O was aborted. */
+				spin_unlock_irqrestore(&task->task_state_lock,
+						       flags);
+
+				isci_task_refuse(ihost, task,
+						 SAS_TASK_UNDELIVERED,
+						 SAM_STAT_TASK_ABORTED);
+			} else {
+				task->task_state_flags |= SAS_TASK_AT_INITIATOR;
+				spin_unlock_irqrestore(&task->task_state_lock, flags);
+
+				/* build and send the request. */
+				status = isci_request_execute(ihost, idev, task, tag);
+
+				if (status != SCI_SUCCESS) {
+
+					spin_lock_irqsave(&task->task_state_lock, flags);
+					/* Did not really start this command. */
+					task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
+					spin_unlock_irqrestore(&task->task_state_lock, flags);
+
+					if (test_bit(IDEV_GONE, &idev->flags)) {
+
+						/* Indicate that the device
+						 * is gone.
+						 */
+						isci_task_refuse(ihost, task,
+							SAS_TASK_UNDELIVERED,
+							SAS_DEVICE_UNKNOWN);
+					} else {
+						/* Indicate QUEUE_FULL so that
+						 * the scsi midlayer retries.
+						 * If the request failed for
+						 * remote device reasons, it
+						 * gets returned as
+						 * SAS_TASK_UNDELIVERED next
+						 * time through.
+						 */
+						isci_task_refuse(ihost, task,
+							SAS_TASK_COMPLETE,
+							SAS_QUEUE_FULL);
+					}
+				}
+			}
+		}
+		if (status != SCI_SUCCESS && tag != SCI_CONTROLLER_INVALID_IO_TAG) {
+			spin_lock_irqsave(&ihost->scic_lock, flags);
+			/* command never hit the device, so just free
+			 * the tci and skip the sequence increment
+			 */
+			isci_tci_free(ihost, ISCI_TAG_TCI(tag));
+			spin_unlock_irqrestore(&ihost->scic_lock, flags);
+		}
+		isci_put_device(idev);
+	}
+	return 0;
+}
+
+static struct isci_request *isci_task_request_build(struct isci_host *ihost,
+						    struct isci_remote_device *idev,
+						    u16 tag, struct isci_tmf *isci_tmf)
+{
+	enum sci_status status = SCI_FAILURE;
+	struct isci_request *ireq = NULL;
+	struct domain_device *dev;
+
+	dev_dbg(&ihost->pdev->dev,
+		"%s: isci_tmf = %p\n", __func__, isci_tmf);
+
+	dev = idev->domain_dev;
+
+	/* do common allocation and init of request object. */
+	ireq = isci_tmf_request_from_tag(ihost, isci_tmf, tag);
+	if (!ireq)
+		return NULL;
+
+	/* let the core do it's construct. */
+	status = sci_task_request_construct(ihost, idev, tag,
+					     ireq);
+
+	if (status != SCI_SUCCESS) {
+		dev_warn(&ihost->pdev->dev,
+			 "%s: sci_task_request_construct failed - "
+			 "status = 0x%x\n",
+			 __func__,
+			 status);
+		return NULL;
+	}
+
+	/* XXX convert to get this from task->tproto like other drivers */
+	if (dev->dev_type == SAS_END_DEV) {
+		isci_tmf->proto = SAS_PROTOCOL_SSP;
+		status = sci_task_request_construct_ssp(ireq);
+		if (status != SCI_SUCCESS)
+			return NULL;
+	}
+
+	return ireq;
+}
+
+/**
+* isci_request_mark_zombie() - This function must be called with scic_lock held.
+*/
+static void isci_request_mark_zombie(struct isci_host *ihost, struct isci_request *ireq)
+{
+	struct completion *tmf_completion = NULL;
+	struct completion *req_completion;
+
+	/* Set the request state to "dead". */
+	ireq->status = dead;
+
+	req_completion = ireq->io_request_completion;
+	ireq->io_request_completion = NULL;
+
+	if (test_bit(IREQ_TMF, &ireq->flags)) {
+		/* Break links with the TMF request. */
+		struct isci_tmf *tmf = isci_request_access_tmf(ireq);
+
+		/* In the case where a task request is dying,
+		 * the thread waiting on the complete will sit and
+		 * timeout unless we wake it now.  Since the TMF
+		 * has a default error status, complete it here
+		 * to wake the waiting thread.
+		 */
+		if (tmf) {
+			tmf_completion = tmf->complete;
+			tmf->complete = NULL;
+		}
+		ireq->ttype_ptr.tmf_task_ptr = NULL;
+		dev_dbg(&ihost->pdev->dev, "%s: tmf_code %d, managed tag %#x\n",
+			__func__, tmf->tmf_code, tmf->io_tag);
+	} else {
+		/* Break links with the sas_task - the callback is done
+		 * elsewhere.
+		 */
+		struct sas_task *task = isci_request_access_task(ireq);
+
+		if (task)
+			task->lldd_task = NULL;
+
+		ireq->ttype_ptr.io_task_ptr = NULL;
+	}
+
+	dev_warn(&ihost->pdev->dev, "task context unrecoverable (tag: %#x)\n",
+		 ireq->io_tag);
+
+	/* Don't force waiting threads to timeout. */
+	if (req_completion)
+		complete(req_completion);
+
+	if (tmf_completion != NULL)
+		complete(tmf_completion);
+}
+
+static int isci_task_execute_tmf(struct isci_host *ihost,
+				 struct isci_remote_device *idev,
+				 struct isci_tmf *tmf, unsigned long timeout_ms)
+{
+	DECLARE_COMPLETION_ONSTACK(completion);
+	enum sci_task_status status = SCI_TASK_FAILURE;
+	struct isci_request *ireq;
+	int ret = TMF_RESP_FUNC_FAILED;
+	unsigned long flags;
+	unsigned long timeleft;
+	u16 tag;
+
+	spin_lock_irqsave(&ihost->scic_lock, flags);
+	tag = isci_alloc_tag(ihost);
+	spin_unlock_irqrestore(&ihost->scic_lock, flags);
+
+	if (tag == SCI_CONTROLLER_INVALID_IO_TAG)
+		return ret;
+
+	/* sanity check, return TMF_RESP_FUNC_FAILED
+	 * if the device is not there and ready.
+	 */
+	if (!idev ||
+	    (!test_bit(IDEV_IO_READY, &idev->flags) &&
+	     !test_bit(IDEV_IO_NCQERROR, &idev->flags))) {
+		dev_dbg(&ihost->pdev->dev,
+			"%s: idev = %p not ready (%#lx)\n",
+			__func__,
+			idev, idev ? idev->flags : 0);
+		goto err_tci;
+	} else
+		dev_dbg(&ihost->pdev->dev,
+			"%s: idev = %p\n",
+			__func__, idev);
+
+	/* Assign the pointer to the TMF's completion kernel wait structure. */
+	tmf->complete = &completion;
+	tmf->status = SCI_FAILURE_TIMEOUT;
+
+	ireq = isci_task_request_build(ihost, idev, tag, tmf);
+	if (!ireq)
+		goto err_tci;
+
+	spin_lock_irqsave(&ihost->scic_lock, flags);
+
+	/* start the TMF io. */
+	status = sci_controller_start_task(ihost, idev, ireq);
+
+	if (status != SCI_TASK_SUCCESS) {
+		dev_dbg(&ihost->pdev->dev,
+			 "%s: start_io failed - status = 0x%x, request = %p\n",
+			 __func__,
+			 status,
+			 ireq);
+		spin_unlock_irqrestore(&ihost->scic_lock, flags);
+		goto err_tci;
+	}
+
+	if (tmf->cb_state_func != NULL)
+		tmf->cb_state_func(isci_tmf_started, tmf, tmf->cb_data);
+
+	isci_request_change_state(ireq, started);
+
+	/* add the request to the remote device request list. */
+	list_add(&ireq->dev_node, &idev->reqs_in_process);
+
+	spin_unlock_irqrestore(&ihost->scic_lock, flags);
+
+	/* Wait for the TMF to complete, or a timeout. */
+	timeleft = wait_for_completion_timeout(&completion,
+					       msecs_to_jiffies(timeout_ms));
+
+	if (timeleft == 0) {
+		/* The TMF did not complete - this could be because
+		 * of an unplug.  Terminate the TMF request now.
+		 */
+		spin_lock_irqsave(&ihost->scic_lock, flags);
+
+		if (tmf->cb_state_func != NULL)
+			tmf->cb_state_func(isci_tmf_timed_out, tmf,
+					   tmf->cb_data);
+
+		sci_controller_terminate_request(ihost, idev, ireq);
+
+		spin_unlock_irqrestore(&ihost->scic_lock, flags);
+
+		timeleft = wait_for_completion_timeout(
+			&completion,
+			msecs_to_jiffies(ISCI_TERMINATION_TIMEOUT_MSEC));
+
+		if (!timeleft) {
+			/* Strange condition - the termination of the TMF
+			 * request timed-out.
+			 */
+			spin_lock_irqsave(&ihost->scic_lock, flags);
+
+			/* If the TMF status has not changed, kill it. */
+			if (tmf->status == SCI_FAILURE_TIMEOUT)
+				isci_request_mark_zombie(ihost, ireq);
+
+			spin_unlock_irqrestore(&ihost->scic_lock, flags);
+		}
+	}
+
+	isci_print_tmf(ihost, tmf);
+
+	if (tmf->status == SCI_SUCCESS)
+		ret =  TMF_RESP_FUNC_COMPLETE;
+	else if (tmf->status == SCI_FAILURE_IO_RESPONSE_VALID) {
+		dev_dbg(&ihost->pdev->dev,
+			"%s: tmf.status == "
+			"SCI_FAILURE_IO_RESPONSE_VALID\n",
+			__func__);
+		ret =  TMF_RESP_FUNC_COMPLETE;
+	}
+	/* Else - leave the default "failed" status alone. */
+
+	dev_dbg(&ihost->pdev->dev,
+		"%s: completed request = %p\n",
+		__func__,
+		ireq);
+
+	return ret;
+
+ err_tci:
+	spin_lock_irqsave(&ihost->scic_lock, flags);
+	isci_tci_free(ihost, ISCI_TAG_TCI(tag));
+	spin_unlock_irqrestore(&ihost->scic_lock, flags);
+
+	return ret;
+}
+
+static void isci_task_build_tmf(struct isci_tmf *tmf,
+				enum isci_tmf_function_codes code,
+				void (*tmf_sent_cb)(enum isci_tmf_cb_state,
+						    struct isci_tmf *,
+						    void *),
+				void *cb_data)
+{
+	memset(tmf, 0, sizeof(*tmf));
+
+	tmf->tmf_code      = code;
+	tmf->cb_state_func = tmf_sent_cb;
+	tmf->cb_data       = cb_data;
+}
+
+static void isci_task_build_abort_task_tmf(struct isci_tmf *tmf,
+					   enum isci_tmf_function_codes code,
+					   void (*tmf_sent_cb)(enum isci_tmf_cb_state,
+							       struct isci_tmf *,
+							       void *),
+					   struct isci_request *old_request)
+{
+	isci_task_build_tmf(tmf, code, tmf_sent_cb, old_request);
+	tmf->io_tag = old_request->io_tag;
+}
+
+/**
+ * isci_task_validate_request_to_abort() - This function checks the given I/O
+ *    against the "started" state.  If the request is still "started", it's
+ *    state is changed to aborted. NOTE: isci_host->scic_lock MUST BE HELD
+ *    BEFORE CALLING THIS FUNCTION.
+ * @isci_request: This parameter specifies the request object to control.
+ * @isci_host: This parameter specifies the ISCI host object
+ * @isci_device: This is the device to which the request is pending.
+ * @aborted_io_completion: This is a completion structure that will be added to
+ *    the request in case it is changed to aborting; this completion is
+ *    triggered when the request is fully completed.
+ *
+ * Either "started" on successful change of the task status to "aborted", or
+ * "unallocated" if the task cannot be controlled.
+ */
+static enum isci_request_status isci_task_validate_request_to_abort(
+	struct isci_request *isci_request,
+	struct isci_host *isci_host,
+	struct isci_remote_device *isci_device,
+	struct completion *aborted_io_completion)
+{
+	enum isci_request_status old_state = unallocated;
+
+	/* Only abort the task if it's in the
+	 *  device's request_in_process list
+	 */
+	if (isci_request && !list_empty(&isci_request->dev_node)) {
+		old_state = isci_request_change_started_to_aborted(
+			isci_request, aborted_io_completion);
+
+	}
+
+	return old_state;
+}
+
+static int isci_request_is_dealloc_managed(enum isci_request_status stat)
+{
+	switch (stat) {
+	case aborted:
+	case aborting:
+	case terminating:
+	case completed:
+	case dead:
+		return true;
+	default:
+		return false;
+	}
+}
+
+/**
+ * isci_terminate_request_core() - This function will terminate the given
+ *    request, and wait for it to complete.  This function must only be called
+ *    from a thread that can wait.  Note that the request is terminated and
+ *    completed (back to the host, if started there).
+ * @ihost: This SCU.
+ * @idev: The target.
+ * @isci_request: The I/O request to be terminated.
+ *
+ */
+static void isci_terminate_request_core(struct isci_host *ihost,
+					struct isci_remote_device *idev,
+					struct isci_request *isci_request)
+{
+	enum sci_status status      = SCI_SUCCESS;
+	bool was_terminated         = false;
+	bool needs_cleanup_handling = false;
+	unsigned long     flags;
+	unsigned long     termination_completed = 1;
+	struct completion *io_request_completion;
+
+	dev_dbg(&ihost->pdev->dev,
+		"%s: device = %p; request = %p\n",
+		__func__, idev, isci_request);
+
+	spin_lock_irqsave(&ihost->scic_lock, flags);
+
+	io_request_completion = isci_request->io_request_completion;
+
+	/* Note that we are not going to control
+	 * the target to abort the request.
+	 */
+	set_bit(IREQ_COMPLETE_IN_TARGET, &isci_request->flags);
+
+	/* Make sure the request wasn't just sitting around signalling
+	 * device condition (if the request handle is NULL, then the
+	 * request completed but needed additional handling here).
+	 */
+	if (!test_bit(IREQ_TERMINATED, &isci_request->flags)) {
+		was_terminated = true;
+		needs_cleanup_handling = true;
+		status = sci_controller_terminate_request(ihost,
+							   idev,
+							   isci_request);
+	}
+	spin_unlock_irqrestore(&ihost->scic_lock, flags);
+
+	/*
+	 * The only time the request to terminate will
+	 * fail is when the io request is completed and
+	 * being aborted.
+	 */
+	if (status != SCI_SUCCESS) {
+		dev_dbg(&ihost->pdev->dev,
+			"%s: sci_controller_terminate_request"
+			" returned = 0x%x\n",
+			__func__, status);
+
+		isci_request->io_request_completion = NULL;
+
+	} else {
+		if (was_terminated) {
+			dev_dbg(&ihost->pdev->dev,
+				"%s: before completion wait (%p/%p)\n",
+				__func__, isci_request, io_request_completion);
+
+			/* Wait here for the request to complete. */
+			termination_completed
+				= wait_for_completion_timeout(
+				   io_request_completion,
+				   msecs_to_jiffies(ISCI_TERMINATION_TIMEOUT_MSEC));
+
+			if (!termination_completed) {
+
+				/* The request to terminate has timed out.  */
+				spin_lock_irqsave(&ihost->scic_lock, flags);
+
+				/* Check for state changes. */
+				if (!test_bit(IREQ_TERMINATED,
+					      &isci_request->flags)) {
+
+					/* The best we can do is to have the
+					 * request die a silent death if it
+					 * ever really completes.
+					 */
+					isci_request_mark_zombie(ihost,
+								 isci_request);
+					needs_cleanup_handling = true;
+				} else
+					termination_completed = 1;
+
+				spin_unlock_irqrestore(&ihost->scic_lock,
+						       flags);
+
+				if (!termination_completed) {
+
+					dev_dbg(&ihost->pdev->dev,
+						"%s: *** Timeout waiting for "
+						"termination(%p/%p)\n",
+						__func__, io_request_completion,
+						isci_request);
+
+					/* The request can no longer be referenced
+					 * safely since it may go away if the
+					 * termination every really does complete.
+					 */
+					isci_request = NULL;
+				}
+			}
+			if (termination_completed)
+				dev_dbg(&ihost->pdev->dev,
+					"%s: after completion wait (%p/%p)\n",
+					__func__, isci_request, io_request_completion);
+		}
+
+		if (termination_completed) {
+
+			isci_request->io_request_completion = NULL;
+
+			/* Peek at the status of the request.  This will tell
+			 * us if there was special handling on the request such that it
+			 * needs to be detached and freed here.
+			 */
+			spin_lock_irqsave(&isci_request->state_lock, flags);
+
+			needs_cleanup_handling
+				= isci_request_is_dealloc_managed(
+					isci_request->status);
+
+			spin_unlock_irqrestore(&isci_request->state_lock, flags);
+
+		}
+		if (needs_cleanup_handling) {
+
+			dev_dbg(&ihost->pdev->dev,
+				"%s: cleanup isci_device=%p, request=%p\n",
+				__func__, idev, isci_request);
+
+			if (isci_request != NULL) {
+				spin_lock_irqsave(&ihost->scic_lock, flags);
+				isci_free_tag(ihost, isci_request->io_tag);
+				isci_request_change_state(isci_request, unallocated);
+				list_del_init(&isci_request->dev_node);
+				spin_unlock_irqrestore(&ihost->scic_lock, flags);
+			}
+		}
+	}
+}
+
+/**
+ * isci_terminate_pending_requests() - This function will change the all of the
+ *    requests on the given device's state to "aborting", will terminate the
+ *    requests, and wait for them to complete.  This function must only be
+ *    called from a thread that can wait.  Note that the requests are all
+ *    terminated and completed (back to the host, if started there).
+ * @isci_host: This parameter specifies SCU.
+ * @idev: This parameter specifies the target.
+ *
+ */
+void isci_terminate_pending_requests(struct isci_host *ihost,
+				     struct isci_remote_device *idev)
+{
+	struct completion request_completion;
+	enum isci_request_status old_state;
+	unsigned long flags;
+	LIST_HEAD(list);
+
+	spin_lock_irqsave(&ihost->scic_lock, flags);
+	list_splice_init(&idev->reqs_in_process, &list);
+
+	/* assumes that isci_terminate_request_core deletes from the list */
+	while (!list_empty(&list)) {
+		struct isci_request *ireq = list_entry(list.next, typeof(*ireq), dev_node);
+
+		/* Change state to "terminating" if it is currently
+		 * "started".
+		 */
+		old_state = isci_request_change_started_to_newstate(ireq,
+								    &request_completion,
+								    terminating);
+		switch (old_state) {
+		case started:
+		case completed:
+		case aborting:
+			break;
+		default:
+			/* termination in progress, or otherwise dispositioned.
+			 * We know the request was on 'list' so should be safe
+			 * to move it back to reqs_in_process
+			 */
+			list_move(&ireq->dev_node, &idev->reqs_in_process);
+			ireq = NULL;
+			break;
+		}
+
+		if (!ireq)
+			continue;
+		spin_unlock_irqrestore(&ihost->scic_lock, flags);
+
+		init_completion(&request_completion);
+
+		dev_dbg(&ihost->pdev->dev,
+			 "%s: idev=%p request=%p; task=%p old_state=%d\n",
+			 __func__, idev, ireq,
+			(!test_bit(IREQ_TMF, &ireq->flags)
+				? isci_request_access_task(ireq)
+				: NULL),
+			old_state);
+
+		/* If the old_state is started:
+		 * This request was not already being aborted. If it had been,
+		 * then the aborting I/O (ie. the TMF request) would not be in
+		 * the aborting state, and thus would be terminated here.  Note
+		 * that since the TMF completion's call to the kernel function
+		 * "complete()" does not happen until the pending I/O request
+		 * terminate fully completes, we do not have to implement a
+		 * special wait here for already aborting requests - the
+		 * termination of the TMF request will force the request
+		 * to finish it's already started terminate.
+		 *
+		 * If old_state == completed:
+		 * This request completed from the SCU hardware perspective
+		 * and now just needs cleaning up in terms of freeing the
+		 * request and potentially calling up to libsas.
+		 *
+		 * If old_state == aborting:
+		 * This request has already gone through a TMF timeout, but may
+		 * not have been terminated; needs cleaning up at least.
+		 */
+		isci_terminate_request_core(ihost, idev, ireq);
+		spin_lock_irqsave(&ihost->scic_lock, flags);
+	}
+	spin_unlock_irqrestore(&ihost->scic_lock, flags);
+}
+
+/**
+ * isci_task_send_lu_reset_sas() - This function is called by of the SAS Domain
+ *    Template functions.
+ * @lun: This parameter specifies the lun to be reset.
+ *
+ * status, zero indicates success.
+ */
+static int isci_task_send_lu_reset_sas(
+	struct isci_host *isci_host,
+	struct isci_remote_device *isci_device,
+	u8 *lun)
+{
+	struct isci_tmf tmf;
+	int ret = TMF_RESP_FUNC_FAILED;
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: isci_host = %p, isci_device = %p\n",
+		__func__, isci_host, isci_device);
+	/* Send the LUN reset to the target.  By the time the call returns,
+	 * the TMF has fully exected in the target (in which case the return
+	 * value is "TMF_RESP_FUNC_COMPLETE", or the request timed-out (or
+	 * was otherwise unable to be executed ("TMF_RESP_FUNC_FAILED").
+	 */
+	isci_task_build_tmf(&tmf, isci_tmf_ssp_lun_reset, NULL, NULL);
+
+	#define ISCI_LU_RESET_TIMEOUT_MS 2000 /* 2 second timeout. */
+	ret = isci_task_execute_tmf(isci_host, isci_device, &tmf, ISCI_LU_RESET_TIMEOUT_MS);
+
+	if (ret == TMF_RESP_FUNC_COMPLETE)
+		dev_dbg(&isci_host->pdev->dev,
+			"%s: %p: TMF_LU_RESET passed\n",
+			__func__, isci_device);
+	else
+		dev_dbg(&isci_host->pdev->dev,
+			"%s: %p: TMF_LU_RESET failed (%x)\n",
+			__func__, isci_device, ret);
+
+	return ret;
+}
+
+int isci_task_lu_reset(struct domain_device *dev, u8 *lun)
+{
+	struct isci_host *isci_host = dev_to_ihost(dev);
+	struct isci_remote_device *isci_device;
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&isci_host->scic_lock, flags);
+	isci_device = isci_lookup_device(dev);
+	spin_unlock_irqrestore(&isci_host->scic_lock, flags);
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: domain_device=%p, isci_host=%p; isci_device=%p\n",
+		 __func__, dev, isci_host, isci_device);
+
+	if (!isci_device) {
+		/* If the device is gone, stop the escalations. */
+		dev_dbg(&isci_host->pdev->dev, "%s: No dev\n", __func__);
+
+		ret = TMF_RESP_FUNC_COMPLETE;
+		goto out;
+	}
+
+	/* Send the task management part of the reset. */
+	if (dev_is_sata(dev)) {
+		sas_ata_schedule_reset(dev);
+		ret = TMF_RESP_FUNC_COMPLETE;
+	} else
+		ret = isci_task_send_lu_reset_sas(isci_host, isci_device, lun);
+
+	/* If the LUN reset worked, all the I/O can now be terminated. */
+	if (ret == TMF_RESP_FUNC_COMPLETE)
+		/* Terminate all I/O now. */
+		isci_terminate_pending_requests(isci_host,
+						isci_device);
+
+ out:
+	isci_put_device(isci_device);
+	return ret;
+}
+
+
+/*	 int (*lldd_clear_nexus_port)(struct asd_sas_port *); */
+int isci_task_clear_nexus_port(struct asd_sas_port *port)
+{
+	return TMF_RESP_FUNC_FAILED;
+}
+
+
+
+int isci_task_clear_nexus_ha(struct sas_ha_struct *ha)
+{
+	return TMF_RESP_FUNC_FAILED;
+}
+
+/* Task Management Functions. Must be called from process context.	 */
+
+/**
+ * isci_abort_task_process_cb() - This is a helper function for the abort task
+ *    TMF command.  It manages the request state with respect to the successful
+ *    transmission / completion of the abort task request.
+ * @cb_state: This parameter specifies when this function was called - after
+ *    the TMF request has been started and after it has timed-out.
+ * @tmf: This parameter specifies the TMF in progress.
+ *
+ *
+ */
+static void isci_abort_task_process_cb(
+	enum isci_tmf_cb_state cb_state,
+	struct isci_tmf *tmf,
+	void *cb_data)
+{
+	struct isci_request *old_request;
+
+	old_request = (struct isci_request *)cb_data;
+
+	dev_dbg(&old_request->isci_host->pdev->dev,
+		"%s: tmf=%p, old_request=%p\n",
+		__func__, tmf, old_request);
+
+	switch (cb_state) {
+
+	case isci_tmf_started:
+		/* The TMF has been started.  Nothing to do here, since the
+		 * request state was already set to "aborted" by the abort
+		 * task function.
+		 */
+		if ((old_request->status != aborted)
+			&& (old_request->status != completed))
+			dev_dbg(&old_request->isci_host->pdev->dev,
+				"%s: Bad request status (%d): tmf=%p, old_request=%p\n",
+				__func__, old_request->status, tmf, old_request);
+		break;
+
+	case isci_tmf_timed_out:
+
+		/* Set the task's state to "aborting", since the abort task
+		 * function thread set it to "aborted" (above) in anticipation
+		 * of the task management request working correctly.  Since the
+		 * timeout has now fired, the TMF request failed.  We set the
+		 * state such that the request completion will indicate the
+		 * device is no longer present.
+		 */
+		isci_request_change_state(old_request, aborting);
+		break;
+
+	default:
+		dev_dbg(&old_request->isci_host->pdev->dev,
+			"%s: Bad cb_state (%d): tmf=%p, old_request=%p\n",
+			__func__, cb_state, tmf, old_request);
+		break;
+	}
+}
+
+/**
+ * isci_task_abort_task() - This function is one of the SAS Domain Template
+ *    functions. This function is called by libsas to abort a specified task.
+ * @task: This parameter specifies the SAS task to abort.
+ *
+ * status, zero indicates success.
+ */
+int isci_task_abort_task(struct sas_task *task)
+{
+	struct isci_host *isci_host = dev_to_ihost(task->dev);
+	DECLARE_COMPLETION_ONSTACK(aborted_io_completion);
+	struct isci_request       *old_request = NULL;
+	enum isci_request_status  old_state;
+	struct isci_remote_device *isci_device = NULL;
+	struct isci_tmf           tmf;
+	int                       ret = TMF_RESP_FUNC_FAILED;
+	unsigned long             flags;
+	int                       perform_termination = 0;
+
+	/* Get the isci_request reference from the task.  Note that
+	 * this check does not depend on the pending request list
+	 * in the device, because tasks driving resets may land here
+	 * after completion in the core.
+	 */
+	spin_lock_irqsave(&isci_host->scic_lock, flags);
+	spin_lock(&task->task_state_lock);
+
+	old_request = task->lldd_task;
+
+	/* If task is already done, the request isn't valid */
+	if (!(task->task_state_flags & SAS_TASK_STATE_DONE) &&
+	    (task->task_state_flags & SAS_TASK_AT_INITIATOR) &&
+	    old_request)
+		isci_device = isci_lookup_device(task->dev);
+
+	spin_unlock(&task->task_state_lock);
+	spin_unlock_irqrestore(&isci_host->scic_lock, flags);
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: dev = %p, task = %p, old_request == %p\n",
+		__func__, isci_device, task, old_request);
+
+	/* Device reset conditions signalled in task_state_flags are the
+	 * responsbility of libsas to observe at the start of the error
+	 * handler thread.
+	 */
+	if (!isci_device || !old_request) {
+		/* The request has already completed and there
+		* is nothing to do here other than to set the task
+		* done bit, and indicate that the task abort function
+		* was sucessful.
+		*/
+		spin_lock_irqsave(&task->task_state_lock, flags);
+		task->task_state_flags |= SAS_TASK_STATE_DONE;
+		task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
+					    SAS_TASK_STATE_PENDING);
+		spin_unlock_irqrestore(&task->task_state_lock, flags);
+
+		ret = TMF_RESP_FUNC_COMPLETE;
+
+		dev_dbg(&isci_host->pdev->dev,
+			"%s: abort task not needed for %p\n",
+			__func__, task);
+		goto out;
+	}
+
+	spin_lock_irqsave(&isci_host->scic_lock, flags);
+
+	/* Check the request status and change to "aborted" if currently
+	 * "starting"; if true then set the I/O kernel completion
+	 * struct that will be triggered when the request completes.
+	 */
+	old_state = isci_task_validate_request_to_abort(
+				old_request, isci_host, isci_device,
+				&aborted_io_completion);
+	if ((old_state != started) &&
+	    (old_state != completed) &&
+	    (old_state != aborting)) {
+
+		spin_unlock_irqrestore(&isci_host->scic_lock, flags);
+
+		/* The request was already being handled by someone else (because
+		* they got to set the state away from started).
+		*/
+		dev_dbg(&isci_host->pdev->dev,
+			"%s:  device = %p; old_request %p already being aborted\n",
+			__func__,
+			isci_device, old_request);
+		ret = TMF_RESP_FUNC_COMPLETE;
+		goto out;
+	}
+	if (task->task_proto == SAS_PROTOCOL_SMP ||
+	    sas_protocol_ata(task->task_proto) ||
+	    test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags)) {
+
+		spin_unlock_irqrestore(&isci_host->scic_lock, flags);
+
+		dev_dbg(&isci_host->pdev->dev,
+			"%s: %s request"
+			" or complete_in_target (%d), thus no TMF\n",
+			__func__,
+			((task->task_proto == SAS_PROTOCOL_SMP)
+				? "SMP"
+				: (sas_protocol_ata(task->task_proto)
+					? "SATA/STP"
+					: "<other>")
+			 ),
+			test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags));
+
+		if (test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags)) {
+			spin_lock_irqsave(&task->task_state_lock, flags);
+			task->task_state_flags |= SAS_TASK_STATE_DONE;
+			task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
+						    SAS_TASK_STATE_PENDING);
+			spin_unlock_irqrestore(&task->task_state_lock, flags);
+			ret = TMF_RESP_FUNC_COMPLETE;
+		} else {
+			spin_lock_irqsave(&task->task_state_lock, flags);
+			task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
+						    SAS_TASK_STATE_PENDING);
+			spin_unlock_irqrestore(&task->task_state_lock, flags);
+		}
+
+		/* STP and SMP devices are not sent a TMF, but the
+		 * outstanding I/O request is terminated below.  This is
+		 * because SATA/STP and SMP discovery path timeouts directly
+		 * call the abort task interface for cleanup.
+		 */
+		perform_termination = 1;
+
+	} else {
+		/* Fill in the tmf stucture */
+		isci_task_build_abort_task_tmf(&tmf, isci_tmf_ssp_task_abort,
+					       isci_abort_task_process_cb,
+					       old_request);
+
+		spin_unlock_irqrestore(&isci_host->scic_lock, flags);
+
+		#define ISCI_ABORT_TASK_TIMEOUT_MS 500 /* 1/2 second timeout */
+		ret = isci_task_execute_tmf(isci_host, isci_device, &tmf,
+					    ISCI_ABORT_TASK_TIMEOUT_MS);
+
+		if (ret == TMF_RESP_FUNC_COMPLETE)
+			perform_termination = 1;
+		else
+			dev_dbg(&isci_host->pdev->dev,
+				"%s: isci_task_send_tmf failed\n", __func__);
+	}
+	if (perform_termination) {
+		set_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags);
+
+		/* Clean up the request on our side, and wait for the aborted
+		 * I/O to complete.
+		 */
+		isci_terminate_request_core(isci_host, isci_device,
+					    old_request);
+	}
+
+	/* Make sure we do not leave a reference to aborted_io_completion */
+	old_request->io_request_completion = NULL;
+ out:
+	isci_put_device(isci_device);
+	return ret;
+}
+
+/**
+ * isci_task_abort_task_set() - This function is one of the SAS Domain Template
+ *    functions. This is one of the Task Management functoins called by libsas,
+ *    to abort all task for the given lun.
+ * @d_device: This parameter specifies the domain device associated with this
+ *    request.
+ * @lun: This parameter specifies the lun associated with this request.
+ *
+ * status, zero indicates success.
+ */
+int isci_task_abort_task_set(
+	struct domain_device *d_device,
+	u8 *lun)
+{
+	return TMF_RESP_FUNC_FAILED;
+}
+
+
+/**
+ * isci_task_clear_aca() - This function is one of the SAS Domain Template
+ *    functions. This is one of the Task Management functoins called by libsas.
+ * @d_device: This parameter specifies the domain device associated with this
+ *    request.
+ * @lun: This parameter specifies the lun	 associated with this request.
+ *
+ * status, zero indicates success.
+ */
+int isci_task_clear_aca(
+	struct domain_device *d_device,
+	u8 *lun)
+{
+	return TMF_RESP_FUNC_FAILED;
+}
+
+
+
+/**
+ * isci_task_clear_task_set() - This function is one of the SAS Domain Template
+ *    functions. This is one of the Task Management functoins called by libsas.
+ * @d_device: This parameter specifies the domain device associated with this
+ *    request.
+ * @lun: This parameter specifies the lun	 associated with this request.
+ *
+ * status, zero indicates success.
+ */
+int isci_task_clear_task_set(
+	struct domain_device *d_device,
+	u8 *lun)
+{
+	return TMF_RESP_FUNC_FAILED;
+}
+
+
+/**
+ * isci_task_query_task() - This function is implemented to cause libsas to
+ *    correctly escalate the failed abort to a LUN or target reset (this is
+ *    because sas_scsi_find_task libsas function does not correctly interpret
+ *    all return codes from the abort task call).  When TMF_RESP_FUNC_SUCC is
+ *    returned, libsas turns this into a LUN reset; when FUNC_FAILED is
+ *    returned, libsas will turn this into a target reset
+ * @task: This parameter specifies the sas task being queried.
+ * @lun: This parameter specifies the lun associated with this request.
+ *
+ * status, zero indicates success.
+ */
+int isci_task_query_task(
+	struct sas_task *task)
+{
+	/* See if there is a pending device reset for this device. */
+	if (task->task_state_flags & SAS_TASK_NEED_DEV_RESET)
+		return TMF_RESP_FUNC_FAILED;
+	else
+		return TMF_RESP_FUNC_SUCC;
+}
+
+/*
+ * isci_task_request_complete() - This function is called by the sci core when
+ *    an task request completes.
+ * @ihost: This parameter specifies the ISCI host object
+ * @ireq: This parameter is the completed isci_request object.
+ * @completion_status: This parameter specifies the completion status from the
+ *    sci core.
+ *
+ * none.
+ */
+void
+isci_task_request_complete(struct isci_host *ihost,
+			   struct isci_request *ireq,
+			   enum sci_task_status completion_status)
+{
+	struct isci_tmf *tmf = isci_request_access_tmf(ireq);
+	struct completion *tmf_complete = NULL;
+	struct completion *request_complete = ireq->io_request_completion;
+
+	dev_dbg(&ihost->pdev->dev,
+		"%s: request = %p, status=%d\n",
+		__func__, ireq, completion_status);
+
+	isci_request_change_state(ireq, completed);
+
+	set_bit(IREQ_COMPLETE_IN_TARGET, &ireq->flags);
+
+	if (tmf) {
+		tmf->status = completion_status;
+
+		if (tmf->proto == SAS_PROTOCOL_SSP) {
+			memcpy(&tmf->resp.resp_iu,
+			       &ireq->ssp.rsp,
+			       SSP_RESP_IU_MAX_SIZE);
+		} else if (tmf->proto == SAS_PROTOCOL_SATA) {
+			memcpy(&tmf->resp.d2h_fis,
+			       &ireq->stp.rsp,
+			       sizeof(struct dev_to_host_fis));
+		}
+		/* PRINT_TMF( ((struct isci_tmf *)request->task)); */
+		tmf_complete = tmf->complete;
+	}
+	sci_controller_complete_io(ihost, ireq->target_device, ireq);
+	/* set the 'terminated' flag handle to make sure it cannot be terminated
+	 *  or completed again.
+	 */
+	set_bit(IREQ_TERMINATED, &ireq->flags);
+
+	/* As soon as something is in the terminate path, deallocation is
+	 * managed there.  Note that the final non-managed state of a task
+	 * request is "completed".
+	 */
+	if ((ireq->status == completed) ||
+	    !isci_request_is_dealloc_managed(ireq->status)) {
+		isci_request_change_state(ireq, unallocated);
+		isci_free_tag(ihost, ireq->io_tag);
+		list_del_init(&ireq->dev_node);
+	}
+
+	/* "request_complete" is set if the task was being terminated. */
+	if (request_complete)
+		complete(request_complete);
+
+	/* The task management part completes last. */
+	if (tmf_complete)
+		complete(tmf_complete);
+}
+
+static int isci_reset_device(struct isci_host *ihost,
+			     struct domain_device *dev,
+			     struct isci_remote_device *idev)
+{
+	int rc;
+	unsigned long flags;
+	enum sci_status status;
+	struct sas_phy *phy = sas_get_local_phy(dev);
+	struct isci_port *iport = dev->port->lldd_port;
+
+	dev_dbg(&ihost->pdev->dev, "%s: idev %p\n", __func__, idev);
+
+	spin_lock_irqsave(&ihost->scic_lock, flags);
+	status = sci_remote_device_reset(idev);
+	spin_unlock_irqrestore(&ihost->scic_lock, flags);
+
+	if (status != SCI_SUCCESS) {
+		dev_dbg(&ihost->pdev->dev,
+			 "%s: sci_remote_device_reset(%p) returned %d!\n",
+			 __func__, idev, status);
+		rc = TMF_RESP_FUNC_FAILED;
+		goto out;
+	}
+
+	if (scsi_is_sas_phy_local(phy)) {
+		struct isci_phy *iphy = &ihost->phys[phy->number];
+
+		rc = isci_port_perform_hard_reset(ihost, iport, iphy);
+	} else
+		rc = sas_phy_reset(phy, !dev_is_sata(dev));
+
+	/* Terminate in-progress I/O now. */
+	isci_remote_device_nuke_requests(ihost, idev);
+
+	/* Since all pending TCs have been cleaned, resume the RNC. */
+	spin_lock_irqsave(&ihost->scic_lock, flags);
+	status = sci_remote_device_reset_complete(idev);
+	spin_unlock_irqrestore(&ihost->scic_lock, flags);
+
+	if (status != SCI_SUCCESS) {
+		dev_dbg(&ihost->pdev->dev,
+			 "%s: sci_remote_device_reset_complete(%p) "
+			 "returned %d!\n", __func__, idev, status);
+	}
+
+	dev_dbg(&ihost->pdev->dev, "%s: idev %p complete.\n", __func__, idev);
+ out:
+	sas_put_local_phy(phy);
+	return rc;
+}
+
+int isci_task_I_T_nexus_reset(struct domain_device *dev)
+{
+	struct isci_host *ihost = dev_to_ihost(dev);
+	struct isci_remote_device *idev;
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&ihost->scic_lock, flags);
+	idev = isci_lookup_device(dev);
+	spin_unlock_irqrestore(&ihost->scic_lock, flags);
+
+	if (!idev) {
+		/* XXX: need to cleanup any ireqs targeting this
+		 * domain_device
+		 */
+		ret = TMF_RESP_FUNC_COMPLETE;
+		goto out;
+	}
+
+	ret = isci_reset_device(ihost, dev, idev);
+ out:
+	isci_put_device(idev);
+	return ret;
+}