[deliverable/linux.git] / drivers / scsi / isci / request.h

/*
 * 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.
 */

#ifndef _ISCI_REQUEST_H_
#define _ISCI_REQUEST_H_

#include "isci.h"
#include "scic_sds_request.h"

/**
 * struct isci_request_status - This enum defines the possible states of an I/O
 *    request.
 *
 *
 */
enum isci_request_status {
	unallocated = 0x00,
	allocated   = 0x01,
	started     = 0x02,
	completed   = 0x03,
	aborting    = 0x04,
	aborted     = 0x05,
	terminating = 0x06,
	dead        = 0x07
};

enum task_type {
	io_task  = 0,
	tmf_task = 1
};

struct isci_request {
	enum isci_request_status status;
	enum task_type ttype;
	unsigned short io_tag;
	bool complete_in_target;
	bool terminated;

	union ttype_ptr_union {
		struct sas_task *io_task_ptr;   /* When ttype==io_task  */
		struct isci_tmf *tmf_task_ptr;  /* When ttype==tmf_task */
	} ttype_ptr;
	struct isci_host *isci_host;
	struct isci_remote_device *isci_device;
	/* For use in the requests_to_{complete|abort} lists: */
	struct list_head completed_node;
	/* For use in the reqs_in_process list: */
	struct list_head dev_node;
	spinlock_t state_lock;
	dma_addr_t request_daddr;
	dma_addr_t zero_scatter_daddr;

	unsigned int num_sg_entries;                    /* returned by pci_alloc_sg */

	/** Note: "io_request_completion" is completed in two different ways
	 * depending on whether this is a TMF or regular request.
	 * - TMF requests are completed in the thread that started them;
	 * - regular requests are completed in the request completion callback
	 *   function.
	 * This difference in operation allows the aborter of a TMF request
	 * to be sure that once the TMF request completes, the I/O that the
	 * TMF was aborting is guaranteed to have completed.
	 */
	struct completion *io_request_completion;
	struct scic_sds_request sci;
};

static inline struct isci_request *sci_req_to_ireq(struct scic_sds_request *sci_req)
{
	struct isci_request *ireq = container_of(sci_req, typeof(*ireq), sci);

	return ireq;
}

/**
 * This function gets the status of the request object.
 * @request: This parameter points to the isci_request object
 *
 * status of the object as a isci_request_status enum.
 */
static inline
enum isci_request_status isci_request_get_state(
	struct isci_request *isci_request)
{
	BUG_ON(isci_request == NULL);

	/*probably a bad sign...	*/
	if (isci_request->status == unallocated)
		dev_warn(&isci_request->isci_host->pdev->dev,
			 "%s: isci_request->status == unallocated\n",
			 __func__);

	return isci_request->status;
}


/**
 * isci_request_change_state() - This function sets the status of the request
 *    object.
 * @request: This parameter points to the isci_request object
 * @status: This Parameter is the new status of the object
 *
 */
static inline enum isci_request_status isci_request_change_state(
	struct isci_request *isci_request,
	enum isci_request_status status)
{
	enum isci_request_status old_state;
	unsigned long flags;

	dev_dbg(&isci_request->isci_host->pdev->dev,
		"%s: isci_request = %p, state = 0x%x\n",
		__func__,
		isci_request,
		status);

	BUG_ON(isci_request == NULL);

	spin_lock_irqsave(&isci_request->state_lock, flags);
	old_state = isci_request->status;
	isci_request->status = status;
	spin_unlock_irqrestore(&isci_request->state_lock, flags);

	return old_state;
}

/**
 * isci_request_change_started_to_newstate() - This function sets the status of
 *    the request object.
 * @request: This parameter points to the isci_request object
 * @status: This Parameter is the new status of the object
 *
 * state previous to any change.
 */
static inline enum isci_request_status isci_request_change_started_to_newstate(
	struct isci_request *isci_request,
	struct completion *completion_ptr,
	enum isci_request_status newstate)
{
	enum isci_request_status old_state;
	unsigned long flags;

	spin_lock_irqsave(&isci_request->state_lock, flags);

	old_state = isci_request->status;

	if (old_state == started || old_state == aborting) {
		BUG_ON(isci_request->io_request_completion != NULL);

		isci_request->io_request_completion = completion_ptr;
		isci_request->status = newstate;
	}
	spin_unlock_irqrestore(&isci_request->state_lock, flags);

	dev_dbg(&isci_request->isci_host->pdev->dev,
		"%s: isci_request = %p, old_state = 0x%x\n",
		__func__,
		isci_request,
		old_state);

	return old_state;
}

/**
 * isci_request_change_started_to_aborted() - This function sets the status of
 *    the request object.
 * @request: This parameter points to the isci_request object
 * @completion_ptr: This parameter is saved as the kernel completion structure
 *    signalled when the old request completes.
 *
 * state previous to any change.
 */
static inline enum isci_request_status isci_request_change_started_to_aborted(
	struct isci_request *isci_request,
	struct completion *completion_ptr)
{
	return isci_request_change_started_to_newstate(
		       isci_request, completion_ptr, aborted
		       );
}
/**
 * isci_request_free() - This function frees the request object.
 * @isci_host: This parameter specifies the ISCI host object
 * @isci_request: This parameter points to the isci_request object
 *
 */
static inline void isci_request_free(
	struct isci_host *isci_host,
	struct isci_request *isci_request)
{
	if (!isci_request)
		return;

	/* release the dma memory if we fail. */
	dma_pool_free(isci_host->dma_pool, isci_request,
		      isci_request->request_daddr);
}


/* #define ISCI_REQUEST_VALIDATE_ACCESS
 */

#ifdef ISCI_REQUEST_VALIDATE_ACCESS

static inline
struct sas_task *isci_request_access_task(struct isci_request *isci_request)
{
	BUG_ON(isci_request->ttype != io_task);
	return isci_request->ttype_ptr.io_task_ptr;
}

static inline
struct isci_tmf *isci_request_access_tmf(struct isci_request *isci_request)
{
	BUG_ON(isci_request->ttype != tmf_task);
	return isci_request->ttype_ptr.tmf_task_ptr;
}

#else  /* not ISCI_REQUEST_VALIDATE_ACCESS */

#define isci_request_access_task(RequestPtr) \
	((RequestPtr)->ttype_ptr.io_task_ptr)

#define isci_request_access_tmf(RequestPtr)  \
	((RequestPtr)->ttype_ptr.tmf_task_ptr)

#endif /* not ISCI_REQUEST_VALIDATE_ACCESS */


int isci_request_alloc_tmf(
	struct isci_host *isci_host,
	struct isci_tmf *isci_tmf,
	struct isci_request **isci_request,
	struct isci_remote_device *isci_device,
	gfp_t gfp_flags);


int isci_request_execute(
	struct isci_host *isci_host,
	struct sas_task *task,
	struct isci_request **request,
	gfp_t gfp_flags);

/**
 * isci_request_unmap_sgl() - This function unmaps the DMA address of a given
 *    sgl
 * @request: This parameter points to the isci_request object
 * @*pdev: This Parameter is the pci_device struct for the controller
 *
 */
static inline void isci_request_unmap_sgl(
	struct isci_request *request,
	struct pci_dev *pdev)
{
	struct sas_task *task = isci_request_access_task(request);

	dev_dbg(&request->isci_host->pdev->dev,
		"%s: request = %p, task = %p,\n"
		"task->data_dir = %d, is_sata = %d\n ",
		__func__,
		request,
		task,
		task->data_dir,
		sas_protocol_ata(task->task_proto));

	if ((task->data_dir != PCI_DMA_NONE) &&
	    !sas_protocol_ata(task->task_proto)) {
		if (task->num_scatter == 0)
			/* 0 indicates a single dma address */
			dma_unmap_single(
				&pdev->dev,
				request->zero_scatter_daddr,
				task->total_xfer_len,
				task->data_dir
				);

		else  /* unmap the sgl dma addresses */
			dma_unmap_sg(
				&pdev->dev,
				task->scatter,
				request->num_sg_entries,
				task->data_dir
				);
	}
}


void isci_request_io_request_complete(
	struct isci_host *isci_host,
	struct isci_request *request,
	enum sci_io_status completion_status);

/**
 * isci_request_io_request_get_next_sge() - This function is called by the sci
 *    core to retrieve the next sge for a given request.
 * @request: This parameter is the isci_request object.
 * @current_sge_address: This parameter is the last sge retrieved by the sci
 *    core for this request.
 *
 * pointer to the next sge for specified request.
 */
static inline void *isci_request_io_request_get_next_sge(
	struct isci_request *request,
	void *current_sge_address)
{
	struct sas_task *task = isci_request_access_task(request);
	void *ret = NULL;

	dev_dbg(&request->isci_host->pdev->dev,
		"%s: request = %p, "
		"current_sge_address = %p, "
		"num_scatter = %d\n",
		__func__,
		request,
		current_sge_address,
		task->num_scatter);

	if (!current_sge_address)	/* First time through.. */
		ret = task->scatter;    /* always task->scatter */
	else if (task->num_scatter == 0) /* Next element, if num_scatter == 0 */
		ret = NULL;              /* there is only one element. */
	else
		ret = sg_next(current_sge_address);     /* sg_next returns NULL
							 * for the last element
							 */

	dev_dbg(&request->isci_host->pdev->dev,
		"%s: next sge address = %p\n",
		__func__,
		ret);

	return ret;
}


void isci_terminate_pending_requests(
	struct isci_host *isci_host,
	struct isci_remote_device *isci_device,
	enum isci_request_status new_request_state);


#endif /* !defined(_ISCI_REQUEST_H_) */
Commit	Line	Data
6f231dda DW	1	/*
	2	* This file is provided under a dual BSD/GPLv2 license. When using or
	3	* redistributing this file, you may do so under either license.
	4	*
	5	* GPL LICENSE SUMMARY
	6	*
	7	* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of version 2 of the GNU General Public License as
	11	* published by the Free Software Foundation.
	12	*
	13	* This program is distributed in the hope that it will be useful, but
	14	* WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
	21	* The full GNU General Public License is included in this distribution
	22	* in the file called LICENSE.GPL.
	23	*
	24	* BSD LICENSE
	25	*
	26	* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
	27	* All rights reserved.
	28	*
	29	* Redistribution and use in source and binary forms, with or without
	30	* modification, are permitted provided that the following conditions
	31	* are met:
	32	*
	33	* * Redistributions of source code must retain the above copyright
	34	* notice, this list of conditions and the following disclaimer.
	35	* * Redistributions in binary form must reproduce the above copyright
	36	* notice, this list of conditions and the following disclaimer in
	37	* the documentation and/or other materials provided with the
	38	* distribution.
	39	* * Neither the name of Intel Corporation nor the names of its
	40	* contributors may be used to endorse or promote products derived
	41	* from this software without specific prior written permission.
	42	*
	43	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	44	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	45	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	46	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	47	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	48	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	49	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	50	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	51	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	52	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	53	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	54	*/
	55
0d84366f	56	#ifndef _ISCI_REQUEST_H_
6f231dda DW	57	#define _ISCI_REQUEST_H_
	58
	59	#include "isci.h"
0d84366f	60	#include "scic_sds_request.h"
6f231dda DW	61
	62	/**
	63	* struct isci_request_status - This enum defines the possible states of an I/O
	64	* request.
	65	*
	66	*
	67	*/
	68	enum isci_request_status {
	69	unallocated = 0x00,
	70	allocated = 0x01,
	71	started = 0x02,
	72	completed = 0x03,
	73	aborting = 0x04,
	74	aborted = 0x05,
4dc043c4 JS	75	terminating = 0x06,
4dc043c4 JS	76	dead = 0x07
6f231dda DW	77	};
	78
	79	enum task_type {
	80	io_task = 0,
	81	tmf_task = 1
	82	};
	83
6f231dda	84	struct isci_request {
6f231dda DW	85	enum isci_request_status status;
	86	enum task_type ttype;
	87	unsigned short io_tag;
	88	bool complete_in_target;
67ea838d	89	bool terminated;
6f231dda DW	90
	91	union ttype_ptr_union {
	92	struct sas_task io_task_ptr; / When ttype==io_task */
	93	struct isci_tmf tmf_task_ptr; / When ttype==tmf_task */
	94	} ttype_ptr;
	95	struct isci_host *isci_host;
	96	struct isci_remote_device *isci_device;
	97	/* For use in the requests_to_{complete\|abort} lists: */
	98	struct list_head completed_node;
	99	/* For use in the reqs_in_process list: */
	100	struct list_head dev_node;
6f231dda DW	101	spinlock_t state_lock;
	102	dma_addr_t request_daddr;
	103	dma_addr_t zero_scatter_daddr;
	104
	105	unsigned int num_sg_entries; /* returned by pci_alloc_sg */
6f231dda DW	106
	107	/** Note: "io_request_completion" is completed in two different ways
	108	* depending on whether this is a TMF or regular request.
	109	* - TMF requests are completed in the thread that started them;
	110	* - regular requests are completed in the request completion callback
	111	* function.
	112	* This difference in operation allows the aborter of a TMF request
	113	* to be sure that once the TMF request completes, the I/O that the
	114	* TMF was aborting is guaranteed to have completed.
	115	*/
	116	struct completion *io_request_completion;
67ea838d	117	struct scic_sds_request sci;
6f231dda DW	118	};
6f231dda DW	119
67ea838d DW	120	static inline struct isci_request sci_req_to_ireq(struct scic_sds_request sci_req)
	121	{
	122	struct isci_request ireq = container_of(sci_req, typeof(ireq), sci);
	123
	124	return ireq;
	125	}
	126
6f231dda DW	127	/**
	128	* This function gets the status of the request object.
	129	* @request: This parameter points to the isci_request object
	130	*
	131	* status of the object as a isci_request_status enum.
	132	*/
	133	static inline
	134	enum isci_request_status isci_request_get_state(
	135	struct isci_request *isci_request)
	136	{
	137	BUG_ON(isci_request == NULL);
	138
	139	/probably a bad sign... /
	140	if (isci_request->status == unallocated)
	141	dev_warn(&isci_request->isci_host->pdev->dev,
	142	"%s: isci_request->status == unallocated\n",
	143	__func__);
	144
	145	return isci_request->status;
	146	}
	147
	148
	149	/**
	150	* isci_request_change_state() - This function sets the status of the request
	151	* object.
	152	* @request: This parameter points to the isci_request object
	153	* @status: This Parameter is the new status of the object
	154	*
	155	*/
	156	static inline enum isci_request_status isci_request_change_state(
	157	struct isci_request *isci_request,
	158	enum isci_request_status status)
	159	{
	160	enum isci_request_status old_state;
	161	unsigned long flags;
	162
	163	dev_dbg(&isci_request->isci_host->pdev->dev,
	164	"%s: isci_request = %p, state = 0x%x\n",
	165	__func__,
	166	isci_request,
	167	status);
	168
	169	BUG_ON(isci_request == NULL);
	170
	171	spin_lock_irqsave(&isci_request->state_lock, flags);
	172	old_state = isci_request->status;
	173	isci_request->status = status;
	174	spin_unlock_irqrestore(&isci_request->state_lock, flags);
	175
	176	return old_state;
	177	}
	178
	179	/**
	180	* isci_request_change_started_to_newstate() - This function sets the status of
	181	* the request object.
	182	* @request: This parameter points to the isci_request object
	183	* @status: This Parameter is the new status of the object
	184	*
	185	* state previous to any change.
	186	*/
	187	static inline enum isci_request_status isci_request_change_started_to_newstate(
	188	struct isci_request *isci_request,
	189	struct completion *completion_ptr,
	190	enum isci_request_status newstate)
191	{
192	enum isci_request_status old_state;
193	unsigned long flags;
194
6f231dda DW	195	spin_lock_irqsave(&isci_request->state_lock, flags);
	196
	197	old_state = isci_request->status;
	198
f219f010	199	if (old_state == started \|\| old_state == aborting) {
6f231dda DW	200	BUG_ON(isci_request->io_request_completion != NULL);
	201
	202	isci_request->io_request_completion = completion_ptr;
	203	isci_request->status = newstate;
	204	}
	205	spin_unlock_irqrestore(&isci_request->state_lock, flags);
	206
	207	dev_dbg(&isci_request->isci_host->pdev->dev,
	208	"%s: isci_request = %p, old_state = 0x%x\n",
	209	__func__,
	210	isci_request,
	211	old_state);
	212
	213	return old_state;
	214	}
	215
	216	/**
	217	* isci_request_change_started_to_aborted() - This function sets the status of
	218	* the request object.
	219	* @request: This parameter points to the isci_request object
	220	* @completion_ptr: This parameter is saved as the kernel completion structure
	221	* signalled when the old request completes.
	222	*
	223	* state previous to any change.
	224	*/
	225	static inline enum isci_request_status isci_request_change_started_to_aborted(
	226	struct isci_request *isci_request,
	227	struct completion *completion_ptr)
	228	{
	229	return isci_request_change_started_to_newstate(
	230	isci_request, completion_ptr, aborted
	231	);
	232	}
	233	/**
	234	* isci_request_free() - This function frees the request object.
	235	* @isci_host: This parameter specifies the ISCI host object
	236	* @isci_request: This parameter points to the isci_request object
	237	*
	238	*/
	239	static inline void isci_request_free(
	240	struct isci_host *isci_host,
	241	struct isci_request *isci_request)
	242	{
6cb4d6b3 BB	243	if (!isci_request)
6cb4d6b3 BB	244	return;
6f231dda DW	245
	246	/* release the dma memory if we fail. */
	247	dma_pool_free(isci_host->dma_pool, isci_request,
	248	isci_request->request_daddr);
	249	}
	250
	251
	252	/* #define ISCI_REQUEST_VALIDATE_ACCESS
	253	*/
	254
	255	#ifdef ISCI_REQUEST_VALIDATE_ACCESS
	256
	257	static inline
	258	struct sas_task isci_request_access_task(struct isci_request isci_request)
	259	{
	260	BUG_ON(isci_request->ttype != io_task);
	261	return isci_request->ttype_ptr.io_task_ptr;
	262	}
	263
	264	static inline
	265	struct isci_tmf isci_request_access_tmf(struct isci_request isci_request)
	266	{
	267	BUG_ON(isci_request->ttype != tmf_task);
	268	return isci_request->ttype_ptr.tmf_task_ptr;
	269	}
	270
	271	#else /* not ISCI_REQUEST_VALIDATE_ACCESS */
	272
	273	#define isci_request_access_task(RequestPtr) \
	274	((RequestPtr)->ttype_ptr.io_task_ptr)
	275
	276	#define isci_request_access_tmf(RequestPtr) \
	277	((RequestPtr)->ttype_ptr.tmf_task_ptr)
	278
	279	#endif /* not ISCI_REQUEST_VALIDATE_ACCESS */
	280
	281
	282	int isci_request_alloc_tmf(
	283	struct isci_host *isci_host,
	284	struct isci_tmf *isci_tmf,
	285	struct isci_request **isci_request,
	286	struct isci_remote_device *isci_device,
	287	gfp_t gfp_flags);
	288
	289
	290	int isci_request_execute(
	291	struct isci_host *isci_host,
	292	struct sas_task *task,
	293	struct isci_request **request,
	294	gfp_t gfp_flags);
	295
	296	/**
	297	* isci_request_unmap_sgl() - This function unmaps the DMA address of a given
	298	* sgl
	299	* @request: This parameter points to the isci_request object
	300	* @*pdev: This Parameter is the pci_device struct for the controller
	301	*
	302	*/
	303	static inline void isci_request_unmap_sgl(
	304	struct isci_request *request,
	305	struct pci_dev *pdev)
	306	{
	307	struct sas_task *task = isci_request_access_task(request);
	308
309	dev_dbg(&request->isci_host->pdev->dev,
310	"%s: request = %p, task = %p,\n"
311	"task->data_dir = %d, is_sata = %d\n ",
312	__func__,
313	request,
314	task,
315	task->data_dir,
316	sas_protocol_ata(task->task_proto));
317
318	if ((task->data_dir != PCI_DMA_NONE) &&
319	!sas_protocol_ata(task->task_proto)) {
320	if (task->num_scatter == 0)
321	/* 0 indicates a single dma address */
322	dma_unmap_single(
323	&pdev->dev,
324	request->zero_scatter_daddr,
325	task->total_xfer_len,
326	task->data_dir
327	);
328
329	else /* unmap the sgl dma addresses */
330	dma_unmap_sg(
331	&pdev->dev,
332	task->scatter,
333	request->num_sg_entries,
334	task->data_dir
335	);
336	}
337	}
338
339
340	void isci_request_io_request_complete(
341	struct isci_host *isci_host,
342	struct isci_request *request,
343	enum sci_io_status completion_status);
344
6f231dda DW	345	/**
	346	* isci_request_io_request_get_next_sge() - This function is called by the sci
	347	* core to retrieve the next sge for a given request.
	348	* @request: This parameter is the isci_request object.
	349	* @current_sge_address: This parameter is the last sge retrieved by the sci
	350	* core for this request.
	351	*
	352	* pointer to the next sge for specified request.
	353	*/
	354	static inline void *isci_request_io_request_get_next_sge(
	355	struct isci_request *request,
	356	void *current_sge_address)
	357	{
	358	struct sas_task *task = isci_request_access_task(request);
	359	void *ret = NULL;
	360
	361	dev_dbg(&request->isci_host->pdev->dev,
	362	"%s: request = %p, "
	363	"current_sge_address = %p, "
	364	"num_scatter = %d\n",
	365	__func__,
	366	request,
	367	current_sge_address,
	368	task->num_scatter);
	369
	370	if (!current_sge_address) /* First time through.. */
	371	ret = task->scatter; /* always task->scatter */
	372	else if (task->num_scatter == 0) /* Next element, if num_scatter == 0 */
	373	ret = NULL; /* there is only one element. */
	374	else
	375	ret = sg_next(current_sge_address); /* sg_next returns NULL
	376	* for the last element
	377	*/
	378
	379	dev_dbg(&request->isci_host->pdev->dev,
	380	"%s: next sge address = %p\n",
	381	__func__,
	382	ret);
	383
	384	return ret;
	385	}
	386
6f231dda	387
6f231dda DW	388	void isci_terminate_pending_requests(
	389	struct isci_host *isci_host,
	390	struct isci_remote_device *isci_device,
	391	enum isci_request_status new_request_state);
	392
	393
	394
	395
	396	#endif /* !defined(_ISCI_REQUEST_H_) */