[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 "host.h"
#include "scu_task_context.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 sci_request_protocol {
	SCIC_NO_PROTOCOL,
	SCIC_SMP_PROTOCOL,
	SCIC_SSP_PROTOCOL,
	SCIC_STP_PROTOCOL
}; /* XXX remove me, use sas_task.{dev|task_proto} instead */;

/**
 * isci_stp_request - extra request infrastructure to handle pio/atapi protocol
 * @pio_len - number of bytes requested at PIO setup
 * @status - pio setup ending status value to tell us if we need
 *	     to wait for another fis or if the transfer is complete.  Upon
 *           receipt of a d2h fis this will be the status field of that fis.
 * @sgl - track pio transfer progress as we iterate through the sgl
 */
struct isci_stp_request {
	u32 pio_len;
	u8 status;

	struct isci_stp_pio_sgl {
		int index;
		u8 set;
		u32 offset;
	} sgl;
};

struct isci_request {
	enum isci_request_status status;
	#define IREQ_COMPLETE_IN_TARGET 0
	#define IREQ_TERMINATED 1
	#define IREQ_TMF 2
	#define IREQ_ACTIVE 3
	unsigned long flags;
	/* XXX kill ttype and ttype_ptr, allocate full sas_task */
	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;
	/* 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;
	/* 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.
	 *
	 * XXX kill io_request_completion
	 */
	struct completion *io_request_completion;
	struct sci_base_state_machine sm;
	struct isci_host *owning_controller;
	struct isci_remote_device *target_device;
	u16 io_tag;
	enum sci_request_protocol protocol;
	u32 scu_status; /* hardware result */
	u32 sci_status; /* upper layer disposition */
	u32 post_context;
	struct scu_task_context *tc;
	/* could be larger with sg chaining */
	#define SCU_SGL_SIZE ((SCI_MAX_SCATTER_GATHER_ELEMENTS + 1) / 2)
	struct scu_sgl_element_pair sg_table[SCU_SGL_SIZE] __attribute__ ((aligned(32)));
	/* This field is a pointer to the stored rx frame data.  It is used in
	 * STP internal requests and SMP response frames.  If this field is
	 * non-NULL the saved frame must be released on IO request completion.
	 */
	u32 saved_rx_frame_index;

	union {
		struct {
			union {
				struct ssp_cmd_iu cmd;
				struct ssp_task_iu tmf;
			};
			union {
				struct ssp_response_iu rsp;
				u8 rsp_buf[SSP_RESP_IU_MAX_SIZE];
			};
		} ssp;
		struct {
			struct isci_stp_request req;
			struct host_to_dev_fis cmd;
			struct dev_to_host_fis rsp;
		} stp;
	};
};

static inline struct isci_request *to_ireq(struct isci_stp_request *stp_req)
{
	struct isci_request *ireq;

	ireq = container_of(stp_req, typeof(*ireq), stp.req);
	return ireq;
}

/**
 * enum sci_base_request_states - request state machine states
 *
 * @SCI_REQ_INIT: Simply the initial state for the base request state machine.
 *
 * @SCI_REQ_CONSTRUCTED: This state indicates that the request has been
 * constructed.  This state is entered from the INITIAL state.
 *
 * @SCI_REQ_STARTED: This state indicates that the request has been started.
 * This state is entered from the CONSTRUCTED state.
 *
 * @SCI_REQ_STP_UDMA_WAIT_TC_COMP:
 * @SCI_REQ_STP_UDMA_WAIT_D2H:
 * @SCI_REQ_STP_NON_DATA_WAIT_H2D:
 * @SCI_REQ_STP_NON_DATA_WAIT_D2H:
 *
 * @SCI_REQ_STP_PIO_WAIT_H2D: While in this state the IO request object is
 * waiting for the TC completion notification for the H2D Register FIS
 *
 * @SCI_REQ_STP_PIO_WAIT_FRAME: While in this state the IO request object is
 * waiting for either a PIO Setup FIS or a D2H register FIS.  The type of frame
 * received is based on the result of the prior frame and line conditions.
 *
 * @SCI_REQ_STP_PIO_DATA_IN: While in this state the IO request object is
 * waiting for a DATA frame from the device.
 *
 * @SCI_REQ_STP_PIO_DATA_OUT: While in this state the IO request object is
 * waiting to transmit the next data frame to the device.
 *
 * @SCI_REQ_ATAPI_WAIT_H2D: While in this state the IO request object is
 * waiting for the TC completion notification for the H2D Register FIS
 *
 * @SCI_REQ_ATAPI_WAIT_PIO_SETUP: While in this state the IO request object is
 * waiting for either a PIO Setup.
 *
 * @SCI_REQ_ATAPI_WAIT_D2H: The non-data IO transit to this state in this state
 * after receiving TC completion. While in this state IO request object is
 * waiting for D2H status frame as UF.
 *
 * @SCI_REQ_ATAPI_WAIT_TC_COMP: When transmitting raw frames hardware reports
 * task context completion after every frame submission, so in the
 * non-accelerated case we need to expect the completion for the "cdb" frame.
 *
 * @SCI_REQ_TASK_WAIT_TC_COMP: The AWAIT_TC_COMPLETION sub-state indicates that
 * the started raw task management request is waiting for the transmission of
 * the initial frame (i.e. command, task, etc.).
 *
 * @SCI_REQ_TASK_WAIT_TC_RESP: This sub-state indicates that the started task
 * management request is waiting for the reception of an unsolicited frame
 * (i.e.  response IU).
 *
 * @SCI_REQ_SMP_WAIT_RESP: This sub-state indicates that the started task
 * management request is waiting for the reception of an unsolicited frame
 * (i.e.  response IU).
 *
 * @SCI_REQ_SMP_WAIT_TC_COMP: The AWAIT_TC_COMPLETION sub-state indicates that
 * the started SMP request is waiting for the transmission of the initial frame
 * (i.e.  command, task, etc.).
 *
 * @SCI_REQ_COMPLETED: This state indicates that the request has completed.
 * This state is entered from the STARTED state. This state is entered from the
 * ABORTING state.
 *
 * @SCI_REQ_ABORTING: This state indicates that the request is in the process
 * of being terminated/aborted.  This state is entered from the CONSTRUCTED
 * state.  This state is entered from the STARTED state.
 *
 * @SCI_REQ_FINAL: Simply the final state for the base request state machine.
 */
#define REQUEST_STATES {\
	C(REQ_INIT),\
	C(REQ_CONSTRUCTED),\
	C(REQ_STARTED),\
	C(REQ_STP_UDMA_WAIT_TC_COMP),\
	C(REQ_STP_UDMA_WAIT_D2H),\
	C(REQ_STP_NON_DATA_WAIT_H2D),\
	C(REQ_STP_NON_DATA_WAIT_D2H),\
	C(REQ_STP_PIO_WAIT_H2D),\
	C(REQ_STP_PIO_WAIT_FRAME),\
	C(REQ_STP_PIO_DATA_IN),\
	C(REQ_STP_PIO_DATA_OUT),\
	C(REQ_ATAPI_WAIT_H2D),\
	C(REQ_ATAPI_WAIT_PIO_SETUP),\
	C(REQ_ATAPI_WAIT_D2H),\
	C(REQ_ATAPI_WAIT_TC_COMP),\
	C(REQ_TASK_WAIT_TC_COMP),\
	C(REQ_TASK_WAIT_TC_RESP),\
	C(REQ_SMP_WAIT_RESP),\
	C(REQ_SMP_WAIT_TC_COMP),\
	C(REQ_COMPLETED),\
	C(REQ_ABORTING),\
	C(REQ_FINAL),\
	}
#undef C
#define C(a) SCI_##a
enum sci_base_request_states REQUEST_STATES;
#undef C
const char *req_state_name(enum sci_base_request_states state);

enum sci_status sci_request_start(struct isci_request *ireq);
enum sci_status sci_io_request_terminate(struct isci_request *ireq);
enum sci_status
sci_io_request_event_handler(struct isci_request *ireq,
				  u32 event_code);
enum sci_status
sci_io_request_frame_handler(struct isci_request *ireq,
				  u32 frame_index);
enum sci_status
sci_task_request_terminate(struct isci_request *ireq);
extern enum sci_status
sci_request_complete(struct isci_request *ireq);
extern enum sci_status
sci_io_request_tc_completion(struct isci_request *ireq, u32 code);

/* XXX open code in caller */
static inline dma_addr_t
sci_io_request_get_dma_addr(struct isci_request *ireq, void *virt_addr)
{

	char *requested_addr = (char *)virt_addr;
	char *base_addr = (char *)ireq;

	BUG_ON(requested_addr < base_addr);
	BUG_ON((requested_addr - base_addr) >= sizeof(*ireq));

	return ireq->request_daddr + (requested_addr - base_addr);
}

/**
 * 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);
}

#define isci_request_access_task(req) ((req)->ttype_ptr.io_task_ptr)

#define isci_request_access_tmf(req) ((req)->ttype_ptr.tmf_task_ptr)

struct isci_request *isci_tmf_request_from_tag(struct isci_host *ihost,
					       struct isci_tmf *isci_tmf,
					       u16 tag);
int isci_request_execute(struct isci_host *ihost, struct isci_remote_device *idev,
			 struct sas_task *task, u16 tag);
void isci_terminate_pending_requests(struct isci_host *ihost,
				     struct isci_remote_device *idev);
enum sci_status
sci_task_request_construct(struct isci_host *ihost,
			    struct isci_remote_device *idev,
			    u16 io_tag,
			    struct isci_request *ireq);
enum sci_status sci_task_request_construct_ssp(struct isci_request *ireq);
void sci_smp_request_copy_response(struct isci_request *ireq);

static inline int isci_task_is_ncq_recovery(struct sas_task *task)
{
	return (sas_protocol_ata(task->task_proto) &&
		task->ata_task.fis.command == ATA_CMD_READ_LOG_EXT &&
		task->ata_task.fis.lbal == ATA_LOG_SATA_NCQ);

}

#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"
ce2b3261	60	#include "host.h"
f1f52e75	61	#include "scu_task_context.h"
6f231dda DW	62
	63	/**
	64	* struct isci_request_status - This enum defines the possible states of an I/O
	65	* request.
	66	*
	67	*
	68	*/
	69	enum isci_request_status {
	70	unallocated = 0x00,
	71	allocated = 0x01,
	72	started = 0x02,
	73	completed = 0x03,
	74	aborting = 0x04,
	75	aborted = 0x05,
4dc043c4 JS	76	terminating = 0x06,
4dc043c4 JS	77	dead = 0x07
6f231dda DW	78	};
6f231dda DW	79
f1f52e75 DW	80	enum sci_request_protocol {
	81	SCIC_NO_PROTOCOL,
	82	SCIC_SMP_PROTOCOL,
	83	SCIC_SSP_PROTOCOL,
	84	SCIC_STP_PROTOCOL
c72086e3	85	}; /* XXX remove me, use sas_task.{dev\|task_proto} instead */;
f1f52e75	86
ba7cb223 DW	87	/**
	88	* isci_stp_request - extra request infrastructure to handle pio/atapi protocol
	89	* @pio_len - number of bytes requested at PIO setup
	90	* @status - pio setup ending status value to tell us if we need
5076a1a9	91	* to wait for another fis or if the transfer is complete. Upon
ba7cb223 DW	92	* receipt of a d2h fis this will be the status field of that fis.
ba7cb223 DW	93	* @sgl - track pio transfer progress as we iterate through the sgl
ba7cb223 DW	94	*/
	95	struct isci_stp_request {
	96	u32 pio_len;
	97	u8 status;
	98
	99	struct isci_stp_pio_sgl {
	100	int index;
	101	u8 set;
	102	u32 offset;
	103	} sgl;
5dec6f4e DW	104	};
5dec6f4e DW	105
5076a1a9 DW	106	struct isci_request {
	107	enum isci_request_status status;
	108	#define IREQ_COMPLETE_IN_TARGET 0
	109	#define IREQ_TERMINATED 1
	110	#define IREQ_TMF 2
	111	#define IREQ_ACTIVE 3
	112	unsigned long flags;
	113	/* XXX kill ttype and ttype_ptr, allocate full sas_task */
5076a1a9 DW	114	union ttype_ptr_union {
	115	struct sas_task io_task_ptr; / When ttype==io_task */
	116	struct isci_tmf tmf_task_ptr; / When ttype==tmf_task */
	117	} ttype_ptr;
	118	struct isci_host *isci_host;
	119	/* For use in the requests_to_{complete\|abort} lists: */
	120	struct list_head completed_node;
	121	/* For use in the reqs_in_process list: */
	122	struct list_head dev_node;
	123	spinlock_t state_lock;
	124	dma_addr_t request_daddr;
	125	dma_addr_t zero_scatter_daddr;
	126	unsigned int num_sg_entries;
	127	/* Note: "io_request_completion" is completed in two different ways
	128	* depending on whether this is a TMF or regular request.
	129	* - TMF requests are completed in the thread that started them;
	130	* - regular requests are completed in the request completion callback
	131	* function.
	132	* This difference in operation allows the aborter of a TMF request
	133	* to be sure that once the TMF request completes, the I/O that the
	134	* TMF was aborting is guaranteed to have completed.
	135	*
	136	* XXX kill io_request_completion
f1f52e75	137	*/
5076a1a9	138	struct completion *io_request_completion;
e301370a	139	struct sci_base_state_machine sm;
d9dcb4ba	140	struct isci_host *owning_controller;
78a6f06e	141	struct isci_remote_device *target_device;
f1f52e75	142	u16 io_tag;
f1f52e75	143	enum sci_request_protocol protocol;
5076a1a9 DW	144	u32 scu_status; /* hardware result */
5076a1a9 DW	145	u32 sci_status; /* upper layer disposition */
f1f52e75	146	u32 post_context;
312e0c24	147	struct scu_task_context *tc;
f1f52e75	148	/* could be larger with sg chaining */
7c78da31	149	#define SCU_SGL_SIZE ((SCI_MAX_SCATTER_GATHER_ELEMENTS + 1) / 2)
f1f52e75	150	struct scu_sgl_element_pair sg_table[SCU_SGL_SIZE] __attribute__ ((aligned(32)));
5076a1a9	151	/* This field is a pointer to the stored rx frame data. It is used in
e301370a EN	152	* STP internal requests and SMP response frames. If this field is
e301370a EN	153	* non-NULL the saved frame must be released on IO request completion.
f1f52e75 DW	154	*/
	155	u32 saved_rx_frame_index;
	156
f1f52e75 DW	157	union {
	158	struct {
	159	union {
	160	struct ssp_cmd_iu cmd;
	161	struct ssp_task_iu tmf;
	162	};
	163	union {
	164	struct ssp_response_iu rsp;
	165	u8 rsp_buf[SSP_RESP_IU_MAX_SIZE];
	166	};
	167	} ssp;
f1f52e75	168	struct {
ba7cb223	169	struct isci_stp_request req;
f1f52e75 DW	170	struct host_to_dev_fis cmd;
	171	struct dev_to_host_fis rsp;
	172	} stp;
	173	};
f1f52e75 DW	174	};
f1f52e75 DW	175
5076a1a9	176	static inline struct isci_request to_ireq(struct isci_stp_request stp_req)
67ea838d	177	{
5076a1a9	178	struct isci_request *ireq;
67ea838d	179
5076a1a9	180	ireq = container_of(stp_req, typeof(*ireq), stp.req);
67ea838d DW	181	return ireq;
	182	}
	183
f1f52e75	184	/**
d7a0ccdd	185	* enum sci_base_request_states - request state machine states
f1f52e75	186	*
d7a0ccdd	187	* @SCI_REQ_INIT: Simply the initial state for the base request state machine.
f1f52e75	188	*
d7a0ccdd DW	189	* @SCI_REQ_CONSTRUCTED: This state indicates that the request has been
	190	* constructed. This state is entered from the INITIAL state.
	191	*
	192	* @SCI_REQ_STARTED: This state indicates that the request has been started.
	193	* This state is entered from the CONSTRUCTED state.
	194	*
	195	* @SCI_REQ_STP_UDMA_WAIT_TC_COMP:
	196	* @SCI_REQ_STP_UDMA_WAIT_D2H:
	197	* @SCI_REQ_STP_NON_DATA_WAIT_H2D:
	198	* @SCI_REQ_STP_NON_DATA_WAIT_D2H:
	199	*
	200	* @SCI_REQ_STP_PIO_WAIT_H2D: While in this state the IO request object is
	201	* waiting for the TC completion notification for the H2D Register FIS
	202	*
	203	* @SCI_REQ_STP_PIO_WAIT_FRAME: While in this state the IO request object is
	204	* waiting for either a PIO Setup FIS or a D2H register FIS. The type of frame
	205	* received is based on the result of the prior frame and line conditions.
	206	*
	207	* @SCI_REQ_STP_PIO_DATA_IN: While in this state the IO request object is
	208	* waiting for a DATA frame from the device.
	209	*
	210	* @SCI_REQ_STP_PIO_DATA_OUT: While in this state the IO request object is
	211	* waiting to transmit the next data frame to the device.
	212	*
	213	* @SCI_REQ_ATAPI_WAIT_H2D: While in this state the IO request object is
	214	* waiting for the TC completion notification for the H2D Register FIS
	215	*
	216	* @SCI_REQ_ATAPI_WAIT_PIO_SETUP: While in this state the IO request object is
	217	* waiting for either a PIO Setup.
	218	*
	219	* @SCI_REQ_ATAPI_WAIT_D2H: The non-data IO transit to this state in this state
	220	* after receiving TC completion. While in this state IO request object is
	221	* waiting for D2H status frame as UF.
	222	*
	223	* @SCI_REQ_ATAPI_WAIT_TC_COMP: When transmitting raw frames hardware reports
	224	* task context completion after every frame submission, so in the
	225	* non-accelerated case we need to expect the completion for the "cdb" frame.
	226	*
	227	* @SCI_REQ_TASK_WAIT_TC_COMP: The AWAIT_TC_COMPLETION sub-state indicates that
	228	* the started raw task management request is waiting for the transmission of
	229	* the initial frame (i.e. command, task, etc.).
	230	*
	231	* @SCI_REQ_TASK_WAIT_TC_RESP: This sub-state indicates that the started task
	232	* management request is waiting for the reception of an unsolicited frame
	233	* (i.e. response IU).
	234	*
	235	* @SCI_REQ_SMP_WAIT_RESP: This sub-state indicates that the started task
	236	* management request is waiting for the reception of an unsolicited frame
	237	* (i.e. response IU).
	238	*
	239	* @SCI_REQ_SMP_WAIT_TC_COMP: The AWAIT_TC_COMPLETION sub-state indicates that
	240	* the started SMP request is waiting for the transmission of the initial frame
	241	* (i.e. command, task, etc.).
	242	*
	243	* @SCI_REQ_COMPLETED: This state indicates that the request has completed.
	244	* This state is entered from the STARTED state. This state is entered from the
	245	* ABORTING state.
	246	*
	247	* @SCI_REQ_ABORTING: This state indicates that the request is in the process
	248	* of being terminated/aborted. This state is entered from the CONSTRUCTED
	249	* state. This state is entered from the STARTED state.
	250	*
	251	* @SCI_REQ_FINAL: Simply the final state for the base request state machine.
f1f52e75	252	*/
d7a0ccdd DW	253	#define REQUEST_STATES {\
	254	C(REQ_INIT),\
	255	C(REQ_CONSTRUCTED),\
	256	C(REQ_STARTED),\
	257	C(REQ_STP_UDMA_WAIT_TC_COMP),\
	258	C(REQ_STP_UDMA_WAIT_D2H),\
	259	C(REQ_STP_NON_DATA_WAIT_H2D),\
	260	C(REQ_STP_NON_DATA_WAIT_D2H),\
	261	C(REQ_STP_PIO_WAIT_H2D),\
	262	C(REQ_STP_PIO_WAIT_FRAME),\
	263	C(REQ_STP_PIO_DATA_IN),\
	264	C(REQ_STP_PIO_DATA_OUT),\
	265	C(REQ_ATAPI_WAIT_H2D),\
	266	C(REQ_ATAPI_WAIT_PIO_SETUP),\
	267	C(REQ_ATAPI_WAIT_D2H),\
	268	C(REQ_ATAPI_WAIT_TC_COMP),\
	269	C(REQ_TASK_WAIT_TC_COMP),\
	270	C(REQ_TASK_WAIT_TC_RESP),\
	271	C(REQ_SMP_WAIT_RESP),\
	272	C(REQ_SMP_WAIT_TC_COMP),\
	273	C(REQ_COMPLETED),\
	274	C(REQ_ABORTING),\
	275	C(REQ_FINAL),\
	276	}
	277	#undef C
	278	#define C(a) SCI_##a
	279	enum sci_base_request_states REQUEST_STATES;
	280	#undef C
	281	const char *req_state_name(enum sci_base_request_states state);
f1f52e75	282
89a7301f DW	283	enum sci_status sci_request_start(struct isci_request *ireq);
89a7301f DW	284	enum sci_status sci_io_request_terminate(struct isci_request *ireq);
e301370a	285	enum sci_status
89a7301f	286	sci_io_request_event_handler(struct isci_request *ireq,
e301370a EN	287	u32 event_code);
e301370a EN	288	enum sci_status
89a7301f	289	sci_io_request_frame_handler(struct isci_request *ireq,
e301370a EN	290	u32 frame_index);
e301370a EN	291	enum sci_status
89a7301f	292	sci_task_request_terminate(struct isci_request *ireq);
e301370a	293	extern enum sci_status
89a7301f	294	sci_request_complete(struct isci_request *ireq);
e301370a	295	extern enum sci_status
89a7301f	296	sci_io_request_tc_completion(struct isci_request *ireq, u32 code);
f1f52e75	297
f1f52e75	298	/* XXX open code in caller */
e301370a	299	static inline dma_addr_t
89a7301f	300	sci_io_request_get_dma_addr(struct isci_request ireq, void virt_addr)
f1f52e75	301	{
f1f52e75 DW	302
	303	char requested_addr = (char )virt_addr;
	304	char base_addr = (char )ireq;
	305
	306	BUG_ON(requested_addr < base_addr);
	307	BUG_ON((requested_addr - base_addr) >= sizeof(*ireq));
	308
	309	return ireq->request_daddr + (requested_addr - base_addr);
	310	}
	311
6f231dda DW	312	/**
	313	* isci_request_change_state() - This function sets the status of the request
	314	* object.
	315	* @request: This parameter points to the isci_request object
	316	* @status: This Parameter is the new status of the object
	317	*
	318	*/
e301370a EN	319	static inline enum isci_request_status
	320	isci_request_change_state(struct isci_request *isci_request,
	321	enum isci_request_status status)
6f231dda DW	322	{
	323	enum isci_request_status old_state;
	324	unsigned long flags;
	325
	326	dev_dbg(&isci_request->isci_host->pdev->dev,
	327	"%s: isci_request = %p, state = 0x%x\n",
	328	__func__,
	329	isci_request,
	330	status);
	331
	332	BUG_ON(isci_request == NULL);
	333
	334	spin_lock_irqsave(&isci_request->state_lock, flags);
	335	old_state = isci_request->status;
	336	isci_request->status = status;
	337	spin_unlock_irqrestore(&isci_request->state_lock, flags);
	338
	339	return old_state;
	340	}
	341
	342	/**
	343	* isci_request_change_started_to_newstate() - This function sets the status of
	344	* the request object.
	345	* @request: This parameter points to the isci_request object
	346	* @status: This Parameter is the new status of the object
	347	*
	348	* state previous to any change.
	349	*/
e301370a EN	350	static inline enum isci_request_status
	351	isci_request_change_started_to_newstate(struct isci_request *isci_request,
	352	struct completion *completion_ptr,
	353	enum isci_request_status newstate)
6f231dda DW	354	{
	355	enum isci_request_status old_state;
	356	unsigned long flags;
	357
6f231dda DW	358	spin_lock_irqsave(&isci_request->state_lock, flags);
	359
	360	old_state = isci_request->status;
	361
f219f010	362	if (old_state == started \|\| old_state == aborting) {
6f231dda DW	363	BUG_ON(isci_request->io_request_completion != NULL);
	364
	365	isci_request->io_request_completion = completion_ptr;
	366	isci_request->status = newstate;
	367	}
e301370a	368
6f231dda DW	369	spin_unlock_irqrestore(&isci_request->state_lock, flags);
	370
	371	dev_dbg(&isci_request->isci_host->pdev->dev,
	372	"%s: isci_request = %p, old_state = 0x%x\n",
	373	__func__,
	374	isci_request,
	375	old_state);
	376
	377	return old_state;
	378	}
	379
	380	/**
	381	* isci_request_change_started_to_aborted() - This function sets the status of
	382	* the request object.
	383	* @request: This parameter points to the isci_request object
	384	* @completion_ptr: This parameter is saved as the kernel completion structure
	385	* signalled when the old request completes.
	386	*
	387	* state previous to any change.
	388	*/
e301370a EN	389	static inline enum isci_request_status
	390	isci_request_change_started_to_aborted(struct isci_request *isci_request,
	391	struct completion *completion_ptr)
6f231dda	392	{
e301370a EN	393	return isci_request_change_started_to_newstate(isci_request,
	394	completion_ptr,
	395	aborted);
6f231dda	396	}
6f231dda	397
e301370a	398	#define isci_request_access_task(req) ((req)->ttype_ptr.io_task_ptr)
6f231dda	399
e301370a	400	#define isci_request_access_tmf(req) ((req)->ttype_ptr.tmf_task_ptr)
6f231dda	401
db056250 DW	402	struct isci_request isci_tmf_request_from_tag(struct isci_host ihost,
	403	struct isci_tmf *isci_tmf,
	404	u16 tag);
209fae14	405	int isci_request_execute(struct isci_host ihost, struct isci_remote_device idev,
db056250	406	struct sas_task *task, u16 tag);
ddcc7e34 DW	407	void isci_terminate_pending_requests(struct isci_host *ihost,
ddcc7e34 DW	408	struct isci_remote_device *idev);
e301370a	409	enum sci_status
89a7301f	410	sci_task_request_construct(struct isci_host *ihost,
78a6f06e	411	struct isci_remote_device *idev,
e301370a	412	u16 io_tag,
5076a1a9	413	struct isci_request *ireq);
43a5ab15	414	enum sci_status sci_task_request_construct_ssp(struct isci_request *ireq);
89a7301f	415	void sci_smp_request_copy_response(struct isci_request *ireq);
9274f45e JS	416
	417	static inline int isci_task_is_ncq_recovery(struct sas_task *task)
	418	{
	419	return (sas_protocol_ata(task->task_proto) &&
a5ec7f86 JB	420	task->ata_task.fis.command == ATA_CMD_READ_LOG_EXT &&
a5ec7f86 JB	421	task->ata_task.fis.lbal == ATA_LOG_SATA_NCQ);
9274f45e JS	422
	423	}
	424
6f231dda	425	#endif /* !defined(_ISCI_REQUEST_H_) */