isci: Removed sci_base_object from scic_sds_request.

[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / scsi / isci / core / scic_sds_request.c

/*
 * 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 "intel_sas.h"
#include "intel_sata.h"
#include "intel_sat.h"
#include "scic_controller.h"
#include "scic_io_request.h"
#include "scic_sds_controller.h"
#include "scu_registers.h"
#include "scic_sds_port.h"
#include "remote_device.h"
#include "scic_sds_request.h"
#include "scic_sds_smp_request.h"
#include "scic_sds_stp_request.h"
#include "scic_sds_unsolicited_frame_control.h"
#include "sci_environment.h"
#include "sci_util.h"
#include "scu_completion_codes.h"
#include "scu_constants.h"
#include "scu_task_context.h"

/*
 * ****************************************************************************
 * * SCIC SDS IO REQUEST CONSTANTS
 * **************************************************************************** */

/**
 *
 *
 * We have no timer requirements for IO requests right now
 */
#define SCIC_SDS_IO_REQUEST_MINIMUM_TIMER_COUNT (0)
#define SCIC_SDS_IO_REQUEST_MAXIMUM_TIMER_COUNT (0)

/*
 * ****************************************************************************
 * * SCIC SDS IO REQUEST MACROS
 * **************************************************************************** */

/**
 * scic_ssp_io_request_get_object_size() -
 *
 * This macro returns the sizeof memory required to store the an SSP IO
 * request.  This does not include the size of the SGL or SCU Task Context
 * memory.
 */
#define scic_ssp_io_request_get_object_size() \
        (\
                sizeof(struct sci_ssp_command_iu) \
                + sizeof(struct sci_ssp_response_iu)    \
        )

/**
 * scic_sds_ssp_request_get_command_buffer() -
 *
 * This macro returns the address of the ssp command buffer in the io request
 * memory
 */
#define scic_sds_ssp_request_get_command_buffer(memory) \
        ((struct sci_ssp_command_iu *)(\
                 ((char *)(memory)) + sizeof(struct scic_sds_request) \
                 ))

/**
 * scic_sds_ssp_request_get_response_buffer() -
 *
 * This macro returns the address of the ssp response buffer in the io request
 * memory
 */
#define scic_sds_ssp_request_get_response_buffer(memory) \
        ((struct sci_ssp_response_iu *)(\
                 ((char *)(scic_sds_ssp_request_get_command_buffer(memory))) \
                 + sizeof(struct sci_ssp_command_iu)    \
                 ))

/**
 * scic_sds_ssp_request_get_task_context_buffer() -
 *
 * This macro returns the address of the task context buffer in the io request
 * memory
 */
#define scic_sds_ssp_request_get_task_context_buffer(memory) \
        ((struct scu_task_context *)(\
                 ((char *)(scic_sds_ssp_request_get_response_buffer(memory))) \
                 + sizeof(struct sci_ssp_response_iu) \
                 ))

/**
 * scic_sds_ssp_request_get_sgl_element_buffer() -
 *
 * This macro returns the address of the sgl elment pairs in the io request
 * memory buffer
 */
#define scic_sds_ssp_request_get_sgl_element_buffer(memory) \
        ((struct scu_sgl_element_pair *)(\
                 ((char *)(scic_sds_ssp_request_get_task_context_buffer(memory))) \
                 + sizeof(struct scu_task_context) \
                 ))


/**
 * scic_ssp_task_request_get_object_size() -
 *
 * This macro returns the sizeof of memory required to store an SSP Task
 * request.  This does not include the size of the SCU Task Context memory.
 */
#define scic_ssp_task_request_get_object_size() \
        (\
                sizeof(struct sci_ssp_task_iu) \
                + sizeof(struct sci_ssp_response_iu)    \
        )

/**
 * scic_sds_ssp_task_request_get_command_buffer() -
 *
 * This macro returns the address of the ssp command buffer in the task request
 * memory.  Yes its the same as the above macro except for the name.
 */
#define scic_sds_ssp_task_request_get_command_buffer(memory) \
        ((struct sci_ssp_task_iu *)(\
                 ((char *)(memory)) + sizeof(struct scic_sds_request) \
                 ))

/**
 * scic_sds_ssp_task_request_get_response_buffer() -
 *
 * This macro returns the address of the ssp response buffer in the task
 * request memory.
 */
#define scic_sds_ssp_task_request_get_response_buffer(memory) \
        ((struct sci_ssp_response_iu *)(\
                 ((char *)(scic_sds_ssp_task_request_get_command_buffer(memory))) \
                 + sizeof(struct sci_ssp_task_iu) \
                 ))

/**
 * scic_sds_ssp_task_request_get_task_context_buffer() -
 *
 * This macro returs the task context buffer for the SSP task request.
 */
#define scic_sds_ssp_task_request_get_task_context_buffer(memory) \
        ((struct scu_task_context *)(\
                 ((char *)(scic_sds_ssp_task_request_get_response_buffer(memory))) \
                 + sizeof(struct sci_ssp_response_iu) \
                 ))



/*
 * ****************************************************************************
 * * SCIC SDS IO REQUEST PRIVATE METHODS
 * **************************************************************************** */

/**
 *
 *
 * This method returns the size required to store an SSP IO request object. u32
 */
static u32 scic_sds_ssp_request_get_object_size(void)
{
        return sizeof(struct scic_sds_request)
               + scic_ssp_io_request_get_object_size()
               + sizeof(struct scu_task_context)
               + SMP_CACHE_BYTES
               + sizeof(struct scu_sgl_element_pair) * SCU_MAX_SGL_ELEMENT_PAIRS;
}

/**
 * This method returns the sgl element pair for the specificed sgl_pair index.
 * @sci_req: This parameter specifies the IO request for which to retrieve
 *    the Scatter-Gather List element pair.
 * @sgl_pair_index: This parameter specifies the index into the SGL element
 *    pair to be retrieved.
 *
 * This method returns a pointer to an struct scu_sgl_element_pair.
 */
static struct scu_sgl_element_pair *scic_sds_request_get_sgl_element_pair(
        struct scic_sds_request *sci_req,
        u32 sgl_pair_index
        ) {
        struct scu_task_context *task_context;

        task_context = (struct scu_task_context *)sci_req->task_context_buffer;

        if (sgl_pair_index == 0) {
                return &task_context->sgl_pair_ab;
        } else if (sgl_pair_index == 1) {
                return &task_context->sgl_pair_cd;
        }

        return &sci_req->sgl_element_pair_buffer[sgl_pair_index - 2];
}

/**
 * This function will build the SGL list for an IO request.
 * @sci_req: This parameter specifies the IO request for which to build
 *    the Scatter-Gather List.
 *
 */
void scic_sds_request_build_sgl(struct scic_sds_request *sds_request)
{
        struct isci_request *isci_request = sds_request->ireq;
        struct isci_host *isci_host = isci_request->isci_host;
        struct sas_task *task = isci_request_access_task(isci_request);
        struct scatterlist *sg = NULL;
        dma_addr_t dma_addr;
        u32 sg_idx = 0;
        struct scu_sgl_element_pair *scu_sg   = NULL;
        struct scu_sgl_element_pair *prev_sg  = NULL;

        if (task->num_scatter > 0) {
                sg = task->scatter;

                while (sg) {
                        scu_sg = scic_sds_request_get_sgl_element_pair(
                                        sds_request,
                                        sg_idx);

                        SCU_SGL_COPY(scu_sg->A, sg);

                        sg = sg_next(sg);

                        if (sg) {
                                SCU_SGL_COPY(scu_sg->B, sg);
                                sg = sg_next(sg);
                        } else
                                SCU_SGL_ZERO(scu_sg->B);

                        if (prev_sg) {
                                dma_addr =
                                        scic_io_request_get_dma_addr(
                                                        sds_request,
                                                        scu_sg);

                                prev_sg->next_pair_upper =
                                        upper_32_bits(dma_addr);
                                prev_sg->next_pair_lower =
                                        lower_32_bits(dma_addr);
                        }

                        prev_sg = scu_sg;
                        sg_idx++;
                }
        } else {        /* handle when no sg */
                scu_sg = scic_sds_request_get_sgl_element_pair(sds_request,
                                                               sg_idx);

                dma_addr = dma_map_single(&isci_host->pdev->dev,
                                          task->scatter,
                                          task->total_xfer_len,
                                          task->data_dir);

                isci_request->zero_scatter_daddr = dma_addr;

                scu_sg->A.length = task->total_xfer_len;
                scu_sg->A.address_upper = upper_32_bits(dma_addr);
                scu_sg->A.address_lower = lower_32_bits(dma_addr);
        }

        if (scu_sg) {
                scu_sg->next_pair_upper = 0;
                scu_sg->next_pair_lower = 0;
        }
}

/**
 * This method build the remainder of the IO request object.
 * @sci_req: This parameter specifies the request object being constructed.
 *
 * The scic_sds_general_request_construct() must be called before this call is
 * valid. none
 */
static void scic_sds_ssp_io_request_assign_buffers(
        struct scic_sds_request *sci_req)
{
        sci_req->command_buffer =
                scic_sds_ssp_request_get_command_buffer(sci_req);
        sci_req->response_buffer =
                scic_sds_ssp_request_get_response_buffer(sci_req);
        sci_req->sgl_element_pair_buffer =
                scic_sds_ssp_request_get_sgl_element_buffer(sci_req);
        sci_req->sgl_element_pair_buffer =
                PTR_ALIGN(sci_req->sgl_element_pair_buffer,
                          sizeof(struct scu_sgl_element_pair));

        if (sci_req->was_tag_assigned_by_user == false) {
                sci_req->task_context_buffer =
                        scic_sds_ssp_request_get_task_context_buffer(sci_req);
                sci_req->task_context_buffer =
                        PTR_ALIGN(sci_req->task_context_buffer,
                                  SMP_CACHE_BYTES);
        }
}

/**
 * This method constructs the SSP Command IU data for this io request object.
 * @sci_req: This parameter specifies the request object for which the SSP
 *    command information unit is being built.
 *
 */
static void scic_sds_io_request_build_ssp_command_iu(
        struct scic_sds_request *sds_request)
{
        struct sci_ssp_command_iu *command_frame;
        u32 cdb_length;
        u32 *cdb_buffer;
        struct isci_request *isci_request = sds_request->ireq;

        command_frame =
                (struct sci_ssp_command_iu *)sds_request->command_buffer;

        command_frame->lun_upper = 0;
        command_frame->lun_lower =
                isci_request_ssp_io_request_get_lun(isci_request);

        ((u32 *)command_frame)[2] = 0;

        cdb_length = isci_request_ssp_io_request_get_cdb_length(isci_request);
        cdb_buffer = (u32 *)isci_request_ssp_io_request_get_cdb_address(
                                        isci_request);

        if (cdb_length > 16) {
                command_frame->additional_cdb_length = cdb_length - 16;
        }

        /* / @todo Is it ok to leave junk at the end of the cdb buffer? */
        scic_word_copy_with_swap(
                (u32 *)(&command_frame->cdb),
                (u32 *)(cdb_buffer),
                (cdb_length + 3) / sizeof(u32)
                );

        command_frame->enable_first_burst = 0;
        command_frame->task_priority =
                isci_request_ssp_io_request_get_command_priority(isci_request);
        command_frame->task_attribute =
                isci_request_ssp_io_request_get_task_attribute(isci_request);
}


/**
 * This method constructs the SSP Task IU data for this io request object.
 * @sci_req:
 *
 */
static void scic_sds_task_request_build_ssp_task_iu(
        struct scic_sds_request *sds_request)
{
        struct sci_ssp_task_iu *command_frame;
        struct isci_request *isci_request = sds_request->ireq;

        command_frame =
                (struct sci_ssp_task_iu *)sds_request->command_buffer;

        command_frame->lun_upper = 0;
        command_frame->lun_lower = isci_request_ssp_io_request_get_lun(
                                        isci_request);

        ((u32 *)command_frame)[2] = 0;

        command_frame->task_function =
                isci_task_ssp_request_get_function(isci_request);
        command_frame->task_tag =
                isci_task_ssp_request_get_io_tag_to_manage(
                                isci_request);
}


/**
 * This method is will fill in the SCU Task Context for any type of SSP request.
 * @sci_req:
 * @task_context:
 *
 */
static void scu_ssp_reqeust_construct_task_context(
        struct scic_sds_request *sds_request,
        struct scu_task_context *task_context)
{
        dma_addr_t dma_addr;
        struct scic_sds_controller *controller;
        struct scic_sds_remote_device *target_device;
        struct scic_sds_port *target_port;

        controller = scic_sds_request_get_controller(sds_request);
        target_device = scic_sds_request_get_device(sds_request);
        target_port = scic_sds_request_get_port(sds_request);

        /* Fill in the TC with the its required data */
        task_context->abort = 0;
        task_context->priority = 0;
        task_context->initiator_request = 1;
        task_context->connection_rate =
                scic_remote_device_get_connection_rate(target_device);
        task_context->protocol_engine_index =
                scic_sds_controller_get_protocol_engine_group(controller);
        task_context->logical_port_index =
                scic_sds_port_get_index(target_port);
        task_context->protocol_type = SCU_TASK_CONTEXT_PROTOCOL_SSP;
        task_context->valid = SCU_TASK_CONTEXT_VALID;
        task_context->context_type = SCU_TASK_CONTEXT_TYPE;

        task_context->remote_node_index =
                scic_sds_remote_device_get_index(sds_request->target_device);
        task_context->command_code = 0;

        task_context->link_layer_control = 0;
        task_context->do_not_dma_ssp_good_response = 1;
        task_context->strict_ordering = 0;
        task_context->control_frame = 0;
        task_context->timeout_enable = 0;
        task_context->block_guard_enable = 0;

        task_context->address_modifier = 0;

        /* task_context->type.ssp.tag = sci_req->io_tag; */
        task_context->task_phase = 0x01;

        if (sds_request->was_tag_assigned_by_user) {
                /*
                 * Build the task context now since we have already read
                 * the data
                 */
                sds_request->post_context =
                        (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
                         (scic_sds_controller_get_protocol_engine_group(
                                                        controller) <<
                          SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
                         (scic_sds_port_get_index(target_port) <<
                          SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT) |
                         scic_sds_io_tag_get_index(sds_request->io_tag));
        } else {
                /*
                 * Build the task context now since we have already read
                 * the data
                 *
                 * I/O tag index is not assigned because we have to wait
                 * until we get a TCi
                 */
                sds_request->post_context =
                        (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
                         (scic_sds_controller_get_protocol_engine_group(
                                                        owning_controller) <<
                          SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
                         (scic_sds_port_get_index(target_port) <<
                          SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT));
        }

        /*
         * Copy the physical address for the command buffer to the
         * SCU Task Context
         */
        dma_addr = scic_io_request_get_dma_addr(sds_request,
                                                sds_request->command_buffer);

        task_context->command_iu_upper = upper_32_bits(dma_addr);
        task_context->command_iu_lower = lower_32_bits(dma_addr);

        /*
         * Copy the physical address for the response buffer to the
         * SCU Task Context
         */
        dma_addr = scic_io_request_get_dma_addr(sds_request,
                                                sds_request->response_buffer);

        task_context->response_iu_upper = upper_32_bits(dma_addr);
        task_context->response_iu_lower = lower_32_bits(dma_addr);
}

/**
 * This method is will fill in the SCU Task Context for a SSP IO request.
 * @sci_req:
 *
 */
static void scu_ssp_io_request_construct_task_context(
        struct scic_sds_request *sci_req,
        enum dma_data_direction dir,
        u32 len)
{
        struct scu_task_context *task_context;

        task_context = scic_sds_request_get_task_context(sci_req);

        scu_ssp_reqeust_construct_task_context(sci_req, task_context);

        task_context->ssp_command_iu_length = sizeof(struct sci_ssp_command_iu) / sizeof(u32);
        task_context->type.ssp.frame_type = SCI_SAS_COMMAND_FRAME;

        switch (dir) {
        case DMA_FROM_DEVICE:
        case DMA_NONE:
        default:
                task_context->task_type = SCU_TASK_TYPE_IOREAD;
                break;
        case DMA_TO_DEVICE:
                task_context->task_type = SCU_TASK_TYPE_IOWRITE;
                break;
        }

        task_context->transfer_length_bytes = len;

        if (task_context->transfer_length_bytes > 0)
                scic_sds_request_build_sgl(sci_req);
}


/**
 * This method will fill in the remainder of the io request object for SSP Task
 *    requests.
 * @sci_req:
 *
 */
static void scic_sds_ssp_task_request_assign_buffers(
        struct scic_sds_request *sci_req)
{
        /* Assign all of the buffer pointers */
        sci_req->command_buffer =
                scic_sds_ssp_task_request_get_command_buffer(sci_req);
        sci_req->response_buffer =
                scic_sds_ssp_task_request_get_response_buffer(sci_req);
        sci_req->sgl_element_pair_buffer = NULL;

        if (sci_req->was_tag_assigned_by_user == false) {
                sci_req->task_context_buffer =
                        scic_sds_ssp_task_request_get_task_context_buffer(sci_req);
                sci_req->task_context_buffer =
                        PTR_ALIGN(sci_req->task_context_buffer, SMP_CACHE_BYTES);
        }
}

/**
 * This method will fill in the SCU Task Context for a SSP Task request.  The
 *    following important settings are utilized: -# priority ==
 *    SCU_TASK_PRIORITY_HIGH.  This ensures that the task request is issued
 *    ahead of other task destined for the same Remote Node. -# task_type ==
 *    SCU_TASK_TYPE_IOREAD.  This simply indicates that a normal request type
 *    (i.e. non-raw frame) is being utilized to perform task management. -#
 *    control_frame == 1.  This ensures that the proper endianess is set so
 *    that the bytes are transmitted in the right order for a task frame.
 * @sci_req: This parameter specifies the task request object being
 *    constructed.
 *
 */
static void scu_ssp_task_request_construct_task_context(
        struct scic_sds_request *sci_req)
{
        struct scu_task_context *task_context;

        task_context = scic_sds_request_get_task_context(sci_req);

        scu_ssp_reqeust_construct_task_context(sci_req, task_context);

        task_context->control_frame                = 1;
        task_context->priority                     = SCU_TASK_PRIORITY_HIGH;
        task_context->task_type                    = SCU_TASK_TYPE_RAW_FRAME;
        task_context->transfer_length_bytes        = 0;
        task_context->type.ssp.frame_type          = SCI_SAS_TASK_FRAME;
        task_context->ssp_command_iu_length = sizeof(struct sci_ssp_task_iu) / sizeof(u32);
}


/**
 * This method constructs the SSP Command IU data for this ssp passthrough
 *    comand request object.
 * @sci_req: This parameter specifies the request object for which the SSP
 *    command information unit is being built.
 *
 * enum sci_status, returns invalid parameter is cdb > 16
 */


/**
 * This method constructs the SATA request object.
 * @sci_req:
 * @sat_protocol:
 * @transfer_length:
 * @data_direction:
 * @copy_rx_frame:
 *
 * enum sci_status
 */
static enum sci_status scic_io_request_construct_sata(struct scic_sds_request *sci_req,
                                                      u8 proto, u32 len,
                                                      enum dma_data_direction dir,
                                                      bool copy)
{
        enum sci_status status = SCI_SUCCESS;

        switch (proto) {
        case SAT_PROTOCOL_PIO_DATA_IN:
        case SAT_PROTOCOL_PIO_DATA_OUT:
                status = scic_sds_stp_pio_request_construct(sci_req, proto, copy);
                break;

        case SAT_PROTOCOL_UDMA_DATA_IN:
        case SAT_PROTOCOL_UDMA_DATA_OUT:
                status = scic_sds_stp_udma_request_construct(sci_req, len, dir);
                break;

        case SAT_PROTOCOL_ATA_HARD_RESET:
        case SAT_PROTOCOL_SOFT_RESET:
                status = scic_sds_stp_soft_reset_request_construct(sci_req);
                break;

        case SAT_PROTOCOL_NON_DATA:
                status = scic_sds_stp_non_data_request_construct(sci_req);
                break;

        case SAT_PROTOCOL_FPDMA:
                status = scic_sds_stp_ncq_request_construct(sci_req, len, dir);
                break;

        case SAT_PROTOCOL_DMA_QUEUED:
        case SAT_PROTOCOL_DMA:
        case SAT_PROTOCOL_DEVICE_DIAGNOSTIC:
        case SAT_PROTOCOL_DEVICE_RESET:
        case SAT_PROTOCOL_RETURN_RESPONSE_INFO:
        default:
                dev_err(scic_to_dev(sci_req->owning_controller),
                        "%s: SCIC IO Request 0x%p received un-handled "
                        "SAT Protocl %d.\n",
                        __func__, sci_req, proto);

                status = SCI_FAILURE;
                break;
        }

        return status;
}

u32 scic_io_request_get_object_size(void)
{
        u32 ssp_request_size;
        u32 stp_request_size;
        u32 smp_request_size;

        ssp_request_size = scic_sds_ssp_request_get_object_size();
        stp_request_size = scic_sds_stp_request_get_object_size();
        smp_request_size = scic_sds_smp_request_get_object_size();

        return max(ssp_request_size, max(stp_request_size, smp_request_size));
}

enum sci_status scic_io_request_construct_basic_ssp(
        struct scic_sds_request *sci_req)
{
        struct isci_request *isci_request = sci_req->ireq;

        sci_req->protocol = SCIC_SSP_PROTOCOL;

        scu_ssp_io_request_construct_task_context(
                sci_req,
                isci_request_io_request_get_data_direction(isci_request),
                isci_request_io_request_get_transfer_length(isci_request));

        scic_sds_io_request_build_ssp_command_iu(sci_req);

        sci_base_state_machine_change_state(&sci_req->state_machine,
                SCI_BASE_REQUEST_STATE_CONSTRUCTED);

        return SCI_SUCCESS;
}


enum sci_status scic_task_request_construct_ssp(
        struct scic_sds_request *sci_req)
{
        /* Construct the SSP Task SCU Task Context */
        scu_ssp_task_request_construct_task_context(sci_req);

        /* Fill in the SSP Task IU */
        scic_sds_task_request_build_ssp_task_iu(sci_req);

        sci_base_state_machine_change_state(&sci_req->state_machine,
                SCI_BASE_REQUEST_STATE_CONSTRUCTED);

        return SCI_SUCCESS;
}


enum sci_status scic_io_request_construct_basic_sata(
                struct scic_sds_request *sci_req)
{
        enum sci_status status;
        struct scic_sds_stp_request *stp_req;
        u8 proto;
        u32 len;
        enum dma_data_direction dir;
        bool copy = false;
        struct isci_request *isci_request = sci_req->ireq;
        struct sas_task *task = isci_request_access_task(isci_request);

        stp_req = container_of(sci_req, typeof(*stp_req), parent);

        sci_req->protocol = SCIC_STP_PROTOCOL;

        len = isci_request_io_request_get_transfer_length(isci_request);
        dir = isci_request_io_request_get_data_direction(isci_request);
        proto = isci_sata_get_sat_protocol(isci_request);
        copy = (task->data_dir == DMA_NONE) ? false : true;

        status = scic_io_request_construct_sata(sci_req, proto, len, dir, copy);

        if (status == SCI_SUCCESS)
                sci_base_state_machine_change_state(&sci_req->state_machine,
                        SCI_BASE_REQUEST_STATE_CONSTRUCTED);

        return status;
}


enum sci_status scic_task_request_construct_sata(
        struct scic_sds_request *sci_req)
{
        enum sci_status status;
        u8 sat_protocol;
        struct isci_request *isci_request = sci_req->ireq;

        sat_protocol = isci_sata_get_sat_protocol(isci_request);

        switch (sat_protocol) {
        case SAT_PROTOCOL_ATA_HARD_RESET:
        case SAT_PROTOCOL_SOFT_RESET:
                status = scic_sds_stp_soft_reset_request_construct(sci_req);
                break;

        default:
                dev_err(scic_to_dev(sci_req->owning_controller),
                        "%s: SCIC IO Request 0x%p received un-handled SAT "
                        "Protocl %d.\n",
                        __func__,
                        sci_req,
                        sat_protocol);

                status = SCI_FAILURE;
                break;
        }

        if (status == SCI_SUCCESS)
                sci_base_state_machine_change_state(&sci_req->state_machine,
                        SCI_BASE_REQUEST_STATE_CONSTRUCTED);

        return status;
}


u16 scic_io_request_get_io_tag(
        struct scic_sds_request *sci_req)
{
        return sci_req->io_tag;
}


u32 scic_request_get_controller_status(
        struct scic_sds_request *sci_req)
{
        return sci_req->scu_status;
}


void *scic_io_request_get_command_iu_address(
        struct scic_sds_request *sci_req)
{
        return sci_req->command_buffer;
}


void *scic_io_request_get_response_iu_address(
        struct scic_sds_request *sci_req)
{
        return sci_req->response_buffer;
}


#define SCU_TASK_CONTEXT_SRAM 0x200000
u32 scic_io_request_get_number_of_bytes_transferred(
        struct scic_sds_request *scic_sds_request)
{
        struct scic_sds_controller *scic = scic_sds_request->owning_controller;
        u32 ret_val = 0;

        if (readl(&scic->smu_registers->address_modifier) == 0) {
                void __iomem *scu_reg_base = scic->scu_registers;
                /*
                 * get the bytes of data from the Address == BAR1 + 20002Ch + (256*TCi) where
                 *   BAR1 is the scu_registers
                 *   0x20002C = 0x200000 + 0x2c
                 *            = start of task context SRAM + offset of (type.ssp.data_offset)
                 *   TCi is the io_tag of struct scic_sds_request */
                ret_val = readl(scu_reg_base +
                                (SCU_TASK_CONTEXT_SRAM + offsetof(struct scu_task_context, type.ssp.data_offset)) +
                                ((sizeof(struct scu_task_context)) * scic_sds_io_tag_get_index(scic_sds_request->io_tag)));
        }

        return ret_val;
}


/*
 * ****************************************************************************
 * * SCIC SDS Interface Implementation
 * **************************************************************************** */

enum sci_status
scic_sds_request_start(struct scic_sds_request *request)
{
        if (request->device_sequence !=
            scic_sds_remote_device_get_sequence(request->target_device))
                return SCI_FAILURE;

        if (request->state_handlers->start_handler)
                return request->state_handlers->start_handler(request);

        dev_warn(scic_to_dev(request->owning_controller),
                 "%s: SCIC IO Request requested to start while in wrong "
                 "state %d\n",
                 __func__,
                 sci_base_state_machine_get_state(&request->state_machine));

        return SCI_FAILURE_INVALID_STATE;
}

enum sci_status
scic_sds_io_request_terminate(struct scic_sds_request *request)
{
        if (request->state_handlers->abort_handler)
                return request->state_handlers->abort_handler(request);

        dev_warn(scic_to_dev(request->owning_controller),
                "%s: SCIC IO Request requested to abort while in wrong "
                "state %d\n",
                __func__,
                sci_base_state_machine_get_state(&request->state_machine));

        return SCI_FAILURE_INVALID_STATE;
}

enum sci_status
scic_sds_io_request_complete(struct scic_sds_request *request)
{
        if (request->state_handlers->complete_handler)
                return request->state_handlers->complete_handler(request);

        dev_warn(scic_to_dev(request->owning_controller),
                "%s: SCIC IO Request requested to complete while in wrong "
                "state %d\n",
                __func__,
                sci_base_state_machine_get_state(&request->state_machine));

        return SCI_FAILURE_INVALID_STATE;
}

enum sci_status scic_sds_io_request_event_handler(
        struct scic_sds_request *request,
        u32 event_code)
{
        if (request->state_handlers->event_handler)
                return request->state_handlers->event_handler(request, event_code);

        dev_warn(scic_to_dev(request->owning_controller),
                 "%s: SCIC IO Request given event code notification %x while "
                 "in wrong state %d\n",
                 __func__,
                 event_code,
                 sci_base_state_machine_get_state(&request->state_machine));

        return SCI_FAILURE_INVALID_STATE;
}

enum sci_status
scic_sds_io_request_tc_completion(struct scic_sds_request *request, u32 completion_code)
{
        if (request->state_machine.current_state_id == SCI_BASE_REQUEST_STATE_STARTED &&
            request->has_started_substate_machine == false)
                return scic_sds_request_started_state_tc_completion_handler(request, completion_code);
        else if (request->state_handlers->tc_completion_handler)
                return request->state_handlers->tc_completion_handler(request, completion_code);

        dev_warn(scic_to_dev(request->owning_controller),
                "%s: SCIC IO Request given task completion notification %x "
                "while in wrong state %d\n",
                __func__,
                completion_code,
                sci_base_state_machine_get_state(&request->state_machine));

        return SCI_FAILURE_INVALID_STATE;

}


/**
 *
 * @sci_req: The SCIC_SDS_IO_REQUEST_T object for which the start
 *    operation is to be executed.
 * @frame_index: The frame index returned by the hardware for the reqeust
 *    object.
 *
 * This method invokes the core state frame handler for the
 * SCIC_SDS_IO_REQUEST_T object. enum sci_status
 */
enum sci_status scic_sds_io_request_frame_handler(
        struct scic_sds_request *request,
        u32 frame_index)
{
        if (request->state_handlers->frame_handler)
                return request->state_handlers->frame_handler(request, frame_index);

        dev_warn(scic_to_dev(request->owning_controller),
                 "%s: SCIC IO Request given unexpected frame %x while in "
                 "state %d\n",
                 __func__,
                 frame_index,
                 sci_base_state_machine_get_state(&request->state_machine));

        scic_sds_controller_release_frame(request->owning_controller, frame_index);
        return SCI_FAILURE_INVALID_STATE;
}

/**
 *
 * @sci_req: The SCIC_SDS_IO_REQUEST_T object for which the task start
 *    operation is to be executed.
 *
 * This method invokes the core state task complete handler for the
 * SCIC_SDS_IO_REQUEST_T object. enum sci_status
 */

/*
 * ****************************************************************************
 * * SCIC SDS PROTECTED METHODS
 * **************************************************************************** */

/**
 * This method copies response data for requests returning response data
 *    instead of sense data.
 * @sci_req: This parameter specifies the request object for which to copy
 *    the response data.
 *
 */
void scic_sds_io_request_copy_response(struct scic_sds_request *sds_request)
{
        void *response_buffer;
        u32 user_response_length;
        u32 core_response_length;
        struct sci_ssp_response_iu *ssp_response;
        struct isci_request *isci_request = sds_request->ireq;

        ssp_response =
                (struct sci_ssp_response_iu *)sds_request->response_buffer;

        response_buffer =
                isci_task_ssp_request_get_response_data_address(
                                isci_request);

        user_response_length =
                isci_task_ssp_request_get_response_data_length(
                                isci_request);

        core_response_length = sci_ssp_get_response_data_length(
                                        ssp_response->response_data_length);

        user_response_length = min(user_response_length, core_response_length);

        memcpy(response_buffer, ssp_response->data, user_response_length);
}

/*
 * *****************************************************************************
 * *  CONSTRUCTED STATE HANDLERS
 * ***************************************************************************** */

/*
 * This method implements the action taken when a constructed
 * SCIC_SDS_IO_REQUEST_T object receives a scic_sds_request_start() request.
 * This method will, if necessary, allocate a TCi for the io request object and
 * then will, if necessary, copy the constructed TC data into the actual TC
 * buffer.  If everything is successful the post context field is updated with
 * the TCi so the controller can post the request to the hardware. enum sci_status
 * SCI_SUCCESS SCI_FAILURE_INSUFFICIENT_RESOURCES
 */
static enum sci_status scic_sds_request_constructed_state_start_handler(
        struct scic_sds_request *request)
{
        struct scu_task_context *task_context;

        if (request->io_tag == SCI_CONTROLLER_INVALID_IO_TAG) {
                request->io_tag =
                        scic_controller_allocate_io_tag(request->owning_controller);
        }

        /* Record the IO Tag in the request */
        if (request->io_tag != SCI_CONTROLLER_INVALID_IO_TAG) {
                task_context = request->task_context_buffer;

                task_context->task_index = scic_sds_io_tag_get_index(request->io_tag);

                switch (task_context->protocol_type) {
                case SCU_TASK_CONTEXT_PROTOCOL_SMP:
                case SCU_TASK_CONTEXT_PROTOCOL_SSP:
                        /* SSP/SMP Frame */
                        task_context->type.ssp.tag = request->io_tag;
                        task_context->type.ssp.target_port_transfer_tag = 0xFFFF;
                        break;

                case SCU_TASK_CONTEXT_PROTOCOL_STP:
                        /*
                         * STP/SATA Frame
                         * task_context->type.stp.ncq_tag = request->ncq_tag; */
                        break;

                case SCU_TASK_CONTEXT_PROTOCOL_NONE:
                        /* / @todo When do we set no protocol type? */
                        break;

                default:
                        /* This should never happen since we build the IO requests */
                        break;
                }

                /*
                 * Check to see if we need to copy the task context buffer
                 * or have been building into the task context buffer */
                if (request->was_tag_assigned_by_user == false) {
                        scic_sds_controller_copy_task_context(
                                request->owning_controller, request);
                }

                /* Add to the post_context the io tag value */
                request->post_context |= scic_sds_io_tag_get_index(request->io_tag);

                /* Everything is good go ahead and change state */
                sci_base_state_machine_change_state(&request->state_machine,
                        SCI_BASE_REQUEST_STATE_STARTED);

                return SCI_SUCCESS;
        }

        return SCI_FAILURE_INSUFFICIENT_RESOURCES;
}

/*
 * This method implements the action to be taken when an SCIC_SDS_IO_REQUEST_T
 * object receives a scic_sds_request_terminate() request. Since the request
 * has not yet been posted to the hardware the request transitions to the
 * completed state. enum sci_status SCI_SUCCESS
 */
static enum sci_status scic_sds_request_constructed_state_abort_handler(
        struct scic_sds_request *request)
{
        /*
         * This request has been terminated by the user make sure that the correct
         * status code is returned */
        scic_sds_request_set_status(request,
                SCU_TASK_DONE_TASK_ABORT,
                SCI_FAILURE_IO_TERMINATED);

        sci_base_state_machine_change_state(&request->state_machine,
                SCI_BASE_REQUEST_STATE_COMPLETED);
        return SCI_SUCCESS;
}

/*
 * *****************************************************************************
 * *  STARTED STATE HANDLERS
 * ***************************************************************************** */

/*
 * This method implements the action to be taken when an SCIC_SDS_IO_REQUEST_T
 * object receives a scic_sds_request_terminate() request. Since the request
 * has been posted to the hardware the io request state is changed to the
 * aborting state. enum sci_status SCI_SUCCESS
 */
enum sci_status scic_sds_request_started_state_abort_handler(
        struct scic_sds_request *request)
{
        if (request->has_started_substate_machine)
                sci_base_state_machine_stop(&request->started_substate_machine);

        sci_base_state_machine_change_state(&request->state_machine,
                SCI_BASE_REQUEST_STATE_ABORTING);
        return SCI_SUCCESS;
}

/**
 * scic_sds_request_started_state_tc_completion_handler() - This method process
 *    TC (task context) completions for normal IO request (i.e. Task/Abort
 *    Completions of type 0).  This method will update the
 *    SCIC_SDS_IO_REQUEST_T::status field.
 * @sci_req: This parameter specifies the request for which a completion
 *    occurred.
 * @completion_code: This parameter specifies the completion code received from
 *    the SCU.
 *
 */
enum sci_status scic_sds_request_started_state_tc_completion_handler(
        struct scic_sds_request *sci_req,
        u32 completion_code)
{
        u8 data_present;
        struct sci_ssp_response_iu *response_buffer;

        /**
         * @todo Any SDMA return code of other than 0 is bad
         *       decode 0x003C0000 to determine SDMA status
         */
        switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
                scic_sds_request_set_status(
                        sci_req, SCU_TASK_DONE_GOOD, SCI_SUCCESS
                        );
                break;

        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_EARLY_RESP):
        {
                /*
                 * There are times when the SCU hardware will return an early response
                 * because the io request specified more data than is returned by the
                 * target device (mode pages, inquiry data, etc.).  We must check the
                 * response stats to see if this is truly a failed request or a good
                 * request that just got completed early. */
                struct sci_ssp_response_iu *response = (struct sci_ssp_response_iu *)
                                                  sci_req->response_buffer;
                scic_word_copy_with_swap(
                        sci_req->response_buffer,
                        sci_req->response_buffer,
                        sizeof(struct sci_ssp_response_iu) / sizeof(u32)
                        );

                if (response->status == 0) {
                        scic_sds_request_set_status(
                                sci_req, SCU_TASK_DONE_GOOD, SCI_SUCCESS_IO_DONE_EARLY
                                );
                } else {
                        scic_sds_request_set_status(
                                sci_req,
                                SCU_TASK_DONE_CHECK_RESPONSE,
                                SCI_FAILURE_IO_RESPONSE_VALID
                                );
                }
        }
        break;

        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_CHECK_RESPONSE):
                scic_word_copy_with_swap(
                        sci_req->response_buffer,
                        sci_req->response_buffer,
                        sizeof(struct sci_ssp_response_iu) / sizeof(u32)
                        );

                scic_sds_request_set_status(
                        sci_req,
                        SCU_TASK_DONE_CHECK_RESPONSE,
                        SCI_FAILURE_IO_RESPONSE_VALID
                        );
                break;

        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_RESP_LEN_ERR):
                /*
                 * / @todo With TASK_DONE_RESP_LEN_ERR is the response frame guaranteed
                 * /       to be received before this completion status is posted? */
                response_buffer =
                        (struct sci_ssp_response_iu *)sci_req->response_buffer;
                data_present =
                        response_buffer->data_present & SCI_SSP_RESPONSE_IU_DATA_PRESENT_MASK;

                if ((data_present == 0x01) || (data_present == 0x02)) {
                        scic_sds_request_set_status(
                                sci_req,
                                SCU_TASK_DONE_CHECK_RESPONSE,
                                SCI_FAILURE_IO_RESPONSE_VALID
                                );
                } else {
                        scic_sds_request_set_status(
                                sci_req, SCU_TASK_DONE_GOOD, SCI_SUCCESS
                                );
                }
                break;

        /* only stp device gets suspended. */
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_ACK_NAK_TO):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_LL_PERR):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_NAK_ERR):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_DATA_LEN_ERR):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_LL_ABORT_ERR):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_XR_WD_LEN):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_MAX_PLD_ERR):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_RESP):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_SDBFIS):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_REG_ERR):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SDB_ERR):
                if (sci_req->protocol == SCIC_STP_PROTOCOL) {
                        scic_sds_request_set_status(
                                sci_req,
                                SCU_GET_COMPLETION_TL_STATUS(completion_code) >> SCU_COMPLETION_TL_STATUS_SHIFT,
                                SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED
                                );
                } else {
                        scic_sds_request_set_status(
                                sci_req,
                                SCU_GET_COMPLETION_TL_STATUS(completion_code) >> SCU_COMPLETION_TL_STATUS_SHIFT,
                                SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR
                                );
                }
                break;

        /* both stp/ssp device gets suspended */
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_LF_ERR):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_WRONG_DESTINATION):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_1):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_2):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_3):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_BAD_DESTINATION):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_ZONE_VIOLATION):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_STP_RESOURCES_BUSY):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_PROTOCOL_NOT_SUPPORTED):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_CONNECTION_RATE_NOT_SUPPORTED):
                scic_sds_request_set_status(
                        sci_req,
                        SCU_GET_COMPLETION_TL_STATUS(completion_code) >> SCU_COMPLETION_TL_STATUS_SHIFT,
                        SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED
                        );
                break;

        /* neither ssp nor stp gets suspended. */
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_NAK_CMD_ERR):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_XR):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_XR_IU_LEN_ERR):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SDMA_ERR):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_OFFSET_ERR):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_EXCESS_DATA):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_RESP_TO_ERR):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_UFI_ERR):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_FRM_TYPE_ERR):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_LL_RX_ERR):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_DATA):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_OPEN_FAIL):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_VIIT_ENTRY_NV):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_IIT_ENTRY_NV):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_RNCNV_OUTBOUND):
        default:
                scic_sds_request_set_status(
                        sci_req,
                        SCU_GET_COMPLETION_TL_STATUS(completion_code) >> SCU_COMPLETION_TL_STATUS_SHIFT,
                        SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR
                        );
                break;
        }

        /**
         * @todo This is probably wrong for ACK/NAK timeout conditions
         */

        /* In all cases we will treat this as the completion of the IO request. */
        sci_base_state_machine_change_state(&sci_req->state_machine,
                SCI_BASE_REQUEST_STATE_COMPLETED);
        return SCI_SUCCESS;
}

/*
 * This method implements the action to be taken when an SCIC_SDS_IO_REQUEST_T
 * object receives a scic_sds_request_frame_handler() request. This method
 * first determines the frame type received.  If this is a response frame then
 * the response data is copied to the io request response buffer for processing
 * at completion time. If the frame type is not a response buffer an error is
 * logged. enum sci_status SCI_SUCCESS SCI_FAILURE_INVALID_PARAMETER_VALUE
 */
static enum sci_status scic_sds_request_started_state_frame_handler(
        struct scic_sds_request *sci_req,
        u32 frame_index)
{
        enum sci_status status;
        struct sci_ssp_frame_header *frame_header;

        /* / @todo If this is a response frame we must record that we received it */
        status = scic_sds_unsolicited_frame_control_get_header(
                &(scic_sds_request_get_controller(sci_req)->uf_control),
                frame_index,
                (void **)&frame_header
                );

        if (frame_header->frame_type == SCI_SAS_RESPONSE_FRAME) {
                struct sci_ssp_response_iu *response_buffer;

                status = scic_sds_unsolicited_frame_control_get_buffer(
                        &(scic_sds_request_get_controller(sci_req)->uf_control),
                        frame_index,
                        (void **)&response_buffer
                        );

                scic_word_copy_with_swap(
                        sci_req->response_buffer,
                        (u32 *)response_buffer,
                        sizeof(struct sci_ssp_response_iu)
                        );

                response_buffer = (struct sci_ssp_response_iu *)sci_req->response_buffer;

                if ((response_buffer->data_present == 0x01) ||
                    (response_buffer->data_present == 0x02)) {
                        scic_sds_request_set_status(
                                sci_req,
                                SCU_TASK_DONE_CHECK_RESPONSE,
                                SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR
                                );
                } else
                        scic_sds_request_set_status(
                                sci_req, SCU_TASK_DONE_GOOD, SCI_SUCCESS
                                );
        } else
                /* This was not a response frame why did it get forwarded? */
                dev_err(scic_to_dev(sci_req->owning_controller),
                        "%s: SCIC IO Request 0x%p received unexpected "
                        "frame %d type 0x%02x\n",
                        __func__,
                        sci_req,
                        frame_index,
                        frame_header->frame_type);

        /*
         * In any case we are done with this frame buffer return it to the
         * controller */
        scic_sds_controller_release_frame(
                sci_req->owning_controller, frame_index
                );

        return SCI_SUCCESS;
}

/*
 * *****************************************************************************
 * *  COMPLETED STATE HANDLERS
 * ***************************************************************************** */


/*
 * This method implements the action to be taken when an SCIC_SDS_IO_REQUEST_T
 * object receives a scic_sds_request_complete() request. This method frees up
 * any io request resources that have been allocated and transitions the
 * request to its final state. Consider stopping the state machine instead of
 * transitioning to the final state? enum sci_status SCI_SUCCESS
 */
static enum sci_status scic_sds_request_completed_state_complete_handler(
        struct scic_sds_request *request)
{
        if (request->was_tag_assigned_by_user != true) {
                scic_controller_free_io_tag(
                        request->owning_controller, request->io_tag);
        }

        if (request->saved_rx_frame_index != SCU_INVALID_FRAME_INDEX) {
                scic_sds_controller_release_frame(
                        request->owning_controller, request->saved_rx_frame_index);
        }

        sci_base_state_machine_change_state(&request->state_machine,
                SCI_BASE_REQUEST_STATE_FINAL);
        return SCI_SUCCESS;
}

/*
 * *****************************************************************************
 * *  ABORTING STATE HANDLERS
 * ***************************************************************************** */

/*
 * This method implements the action to be taken when an SCIC_SDS_IO_REQUEST_T
 * object receives a scic_sds_request_terminate() request. This method is the
 * io request aborting state abort handlers.  On receipt of a multiple
 * terminate requests the io request will transition to the completed state.
 * This should not happen in normal operation. enum sci_status SCI_SUCCESS
 */
static enum sci_status scic_sds_request_aborting_state_abort_handler(
        struct scic_sds_request *request)
{
        sci_base_state_machine_change_state(&request->state_machine,
                SCI_BASE_REQUEST_STATE_COMPLETED);
        return SCI_SUCCESS;
}

/*
 * This method implements the action to be taken when an SCIC_SDS_IO_REQUEST_T
 * object receives a scic_sds_request_task_completion() request. This method
 * decodes the completion type waiting for the abort task complete
 * notification. When the abort task complete is received the io request
 * transitions to the completed state. enum sci_status SCI_SUCCESS
 */
static enum sci_status scic_sds_request_aborting_state_tc_completion_handler(
        struct scic_sds_request *sci_req,
        u32 completion_code)
{
        switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
        case (SCU_TASK_DONE_GOOD << SCU_COMPLETION_TL_STATUS_SHIFT):
        case (SCU_TASK_DONE_TASK_ABORT << SCU_COMPLETION_TL_STATUS_SHIFT):
                scic_sds_request_set_status(
                        sci_req, SCU_TASK_DONE_TASK_ABORT, SCI_FAILURE_IO_TERMINATED
                        );

                sci_base_state_machine_change_state(&sci_req->state_machine,
                        SCI_BASE_REQUEST_STATE_COMPLETED);
                break;

        default:
                /*
                 * Unless we get some strange error wait for the task abort to complete
                 * TODO: Should there be a state change for this completion? */
                break;
        }

        return SCI_SUCCESS;
}

/*
 * This method implements the action to be taken when an SCIC_SDS_IO_REQUEST_T
 * object receives a scic_sds_request_frame_handler() request. This method
 * discards the unsolicited frame since we are waiting for the abort task
 * completion. enum sci_status SCI_SUCCESS
 */
static enum sci_status scic_sds_request_aborting_state_frame_handler(
        struct scic_sds_request *sci_req,
        u32 frame_index)
{
        /* TODO: Is it even possible to get an unsolicited frame in the aborting state? */

        scic_sds_controller_release_frame(
                sci_req->owning_controller, frame_index);

        return SCI_SUCCESS;
}

static const struct scic_sds_io_request_state_handler scic_sds_request_state_handler_table[] = {
        [SCI_BASE_REQUEST_STATE_INITIAL] = {
        },
        [SCI_BASE_REQUEST_STATE_CONSTRUCTED] = {
                .start_handler          = scic_sds_request_constructed_state_start_handler,
                .abort_handler          = scic_sds_request_constructed_state_abort_handler,
        },
        [SCI_BASE_REQUEST_STATE_STARTED] = {
                .abort_handler          = scic_sds_request_started_state_abort_handler,
                .tc_completion_handler  = scic_sds_request_started_state_tc_completion_handler,
                .frame_handler          = scic_sds_request_started_state_frame_handler,
        },
        [SCI_BASE_REQUEST_STATE_COMPLETED] = {
                .complete_handler       = scic_sds_request_completed_state_complete_handler,
        },
        [SCI_BASE_REQUEST_STATE_ABORTING] = {
                .abort_handler          = scic_sds_request_aborting_state_abort_handler,
                .tc_completion_handler  = scic_sds_request_aborting_state_tc_completion_handler,
                .frame_handler          = scic_sds_request_aborting_state_frame_handler,
        },
        [SCI_BASE_REQUEST_STATE_FINAL] = {
        },
};

/**
 * scic_sds_request_initial_state_enter() -
 * @object: This parameter specifies the base object for which the state
 *    transition is occurring.
 *
 * This method implements the actions taken when entering the
 * SCI_BASE_REQUEST_STATE_INITIAL state. This state is entered when the initial
 * base request is constructed. Entry into the initial state sets all handlers
 * for the io request object to their default handlers. none
 */
static void scic_sds_request_initial_state_enter(void *object)
{
        struct scic_sds_request *sci_req = object;

        SET_STATE_HANDLER(
                sci_req,
                scic_sds_request_state_handler_table,
                SCI_BASE_REQUEST_STATE_INITIAL
                );
}

/**
 * scic_sds_request_constructed_state_enter() -
 * @object: The io request object that is to enter the constructed state.
 *
 * This method implements the actions taken when entering the
 * SCI_BASE_REQUEST_STATE_CONSTRUCTED state. The method sets the state handlers
 * for the the constructed state. none
 */
static void scic_sds_request_constructed_state_enter(void *object)
{
        struct scic_sds_request *sci_req = object;

        SET_STATE_HANDLER(
                sci_req,
                scic_sds_request_state_handler_table,
                SCI_BASE_REQUEST_STATE_CONSTRUCTED
                );
}

/**
 * scic_sds_request_started_state_enter() -
 * @object: This parameter specifies the base object for which the state
 *    transition is occurring.  This is cast into a SCIC_SDS_IO_REQUEST object.
 *
 * This method implements the actions taken when entering the
 * SCI_BASE_REQUEST_STATE_STARTED state. If the io request object type is a
 * SCSI Task request we must enter the started substate machine. none
 */
static void scic_sds_request_started_state_enter(void *object)
{
        struct scic_sds_request *sci_req = object;

        SET_STATE_HANDLER(
                sci_req,
                scic_sds_request_state_handler_table,
                SCI_BASE_REQUEST_STATE_STARTED
                );

        /*
         * Most of the request state machines have a started substate machine so
         * start its execution on the entry to the started state. */
        if (sci_req->has_started_substate_machine == true)
                sci_base_state_machine_start(&sci_req->started_substate_machine);
}

/**
 * scic_sds_request_started_state_exit() -
 * @object: This parameter specifies the base object for which the state
 *    transition is occurring.  This object is cast into a SCIC_SDS_IO_REQUEST
 *    object.
 *
 * This method implements the actions taken when exiting the
 * SCI_BASE_REQUEST_STATE_STARTED state. For task requests the action will be
 * to stop the started substate machine. none
 */
static void scic_sds_request_started_state_exit(void *object)
{
        struct scic_sds_request *sci_req = object;

        if (sci_req->has_started_substate_machine == true)
                sci_base_state_machine_stop(&sci_req->started_substate_machine);
}

/**
 * scic_sds_request_completed_state_enter() -
 * @object: This parameter specifies the base object for which the state
 *    transition is occurring.  This object is cast into a SCIC_SDS_IO_REQUEST
 *    object.
 *
 * This method implements the actions taken when entering the
 * SCI_BASE_REQUEST_STATE_COMPLETED state.  This state is entered when the
 * SCIC_SDS_IO_REQUEST has completed.  The method will decode the request
 * completion status and convert it to an enum sci_status to return in the
 * completion callback function. none
 */
static void scic_sds_request_completed_state_enter(void *object)
{
        struct scic_sds_request *sci_req = object;
        struct scic_sds_controller *scic =
                scic_sds_request_get_controller(sci_req);
        struct isci_host *ihost = scic->ihost;
        struct isci_request *ireq = sci_req->ireq;

        SET_STATE_HANDLER(sci_req,
                          scic_sds_request_state_handler_table,
                          SCI_BASE_REQUEST_STATE_COMPLETED);

        /* Tell the SCI_USER that the IO request is complete */
        if (sci_req->is_task_management_request == false)
                isci_request_io_request_complete(ihost,
                                                 ireq,
                                                 sci_req->sci_status);
        else
                isci_task_request_complete(ihost, ireq, sci_req->sci_status);
}

/**
 * scic_sds_request_aborting_state_enter() -
 * @object: This parameter specifies the base object for which the state
 *    transition is occurring.  This object is cast into a SCIC_SDS_IO_REQUEST
 *    object.
 *
 * This method implements the actions taken when entering the
 * SCI_BASE_REQUEST_STATE_ABORTING state. none
 */
static void scic_sds_request_aborting_state_enter(void *object)
{
        struct scic_sds_request *sci_req = object;

        /* Setting the abort bit in the Task Context is required by the silicon. */
        sci_req->task_context_buffer->abort = 1;

        SET_STATE_HANDLER(
                sci_req,
                scic_sds_request_state_handler_table,
                SCI_BASE_REQUEST_STATE_ABORTING
                );
}

/**
 * scic_sds_request_final_state_enter() -
 * @object: This parameter specifies the base object for which the state
 *    transition is occurring.  This is cast into a SCIC_SDS_IO_REQUEST object.
 *
 * This method implements the actions taken when entering the
 * SCI_BASE_REQUEST_STATE_FINAL state. The only action required is to put the
 * state handlers in place. none
 */
static void scic_sds_request_final_state_enter(void *object)
{
        struct scic_sds_request *sci_req = object;

        SET_STATE_HANDLER(
                sci_req,
                scic_sds_request_state_handler_table,
                SCI_BASE_REQUEST_STATE_FINAL
                );
}

static const struct sci_base_state scic_sds_request_state_table[] = {
        [SCI_BASE_REQUEST_STATE_INITIAL] = {
                .enter_state = scic_sds_request_initial_state_enter,
        },
        [SCI_BASE_REQUEST_STATE_CONSTRUCTED] = {
                .enter_state = scic_sds_request_constructed_state_enter,
        },
        [SCI_BASE_REQUEST_STATE_STARTED] = {
                .enter_state = scic_sds_request_started_state_enter,
                .exit_state  = scic_sds_request_started_state_exit
        },
        [SCI_BASE_REQUEST_STATE_COMPLETED] = {
                .enter_state = scic_sds_request_completed_state_enter,
        },
        [SCI_BASE_REQUEST_STATE_ABORTING] = {
                .enter_state = scic_sds_request_aborting_state_enter,
        },
        [SCI_BASE_REQUEST_STATE_FINAL] = {
                .enter_state = scic_sds_request_final_state_enter,
        },
};

static void scic_sds_general_request_construct(struct scic_sds_controller *scic,
                                               struct scic_sds_remote_device *sci_dev,
                                               u16 io_tag,
                                               void *user_io_request_object,
                                               struct scic_sds_request *sci_req)
{
        sci_base_state_machine_construct(&sci_req->state_machine, sci_req,
                        scic_sds_request_state_table, SCI_BASE_REQUEST_STATE_INITIAL);
        sci_base_state_machine_start(&sci_req->state_machine);

        sci_req->io_tag = io_tag;
        sci_req->user_request = user_io_request_object;
        sci_req->owning_controller = scic;
        sci_req->target_device = sci_dev;
        sci_req->has_started_substate_machine = false;
        sci_req->protocol = SCIC_NO_PROTOCOL;
        sci_req->saved_rx_frame_index = SCU_INVALID_FRAME_INDEX;
        sci_req->device_sequence = scic_sds_remote_device_get_sequence(sci_dev);

        sci_req->sci_status   = SCI_SUCCESS;
        sci_req->scu_status   = 0;
        sci_req->post_context = 0xFFFFFFFF;

        sci_req->is_task_management_request = false;

        if (io_tag == SCI_CONTROLLER_INVALID_IO_TAG) {
                sci_req->was_tag_assigned_by_user = false;
                sci_req->task_context_buffer = NULL;
        } else {
                sci_req->was_tag_assigned_by_user = true;

                sci_req->task_context_buffer =
                        scic_sds_controller_get_task_context_buffer(scic, io_tag);
        }
}

enum sci_status scic_io_request_construct(struct scic_sds_controller *scic,
                                          struct scic_sds_remote_device *sci_dev,
                                          u16 io_tag,
                                          void *user_io_request_object,
                                          struct scic_sds_request *sci_req,
                                          struct scic_sds_request **new_scic_io_request_handle)
{
        struct domain_device *dev = sci_dev_to_domain(sci_dev);
        enum sci_status status = SCI_SUCCESS;

        /* Build the common part of the request */
        scic_sds_general_request_construct(scic, sci_dev, io_tag,
                                           user_io_request_object, sci_req);

        if (sci_dev->rnc.remote_node_index == SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX)
                return SCI_FAILURE_INVALID_REMOTE_DEVICE;

        if (dev->dev_type == SAS_END_DEV) {
                scic_sds_ssp_io_request_assign_buffers(sci_req);
        } else if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP)) {
                scic_sds_stp_request_assign_buffers(sci_req);
                memset(sci_req->command_buffer, 0, sizeof(struct sata_fis_reg_h2d));
        } else if (dev_is_expander(dev)) {
                scic_sds_smp_request_assign_buffers(sci_req);
                memset(sci_req->command_buffer, 0, sizeof(struct smp_request));
        } else
                status = SCI_FAILURE_UNSUPPORTED_PROTOCOL;

        if (status == SCI_SUCCESS) {
                memset(sci_req->task_context_buffer, 0,
                        SCI_FIELD_OFFSET(struct scu_task_context, sgl_pair_ab));
                *new_scic_io_request_handle = sci_req;
        }

        return status;
}

enum sci_status scic_task_request_construct(struct scic_sds_controller *scic,
                                            struct scic_sds_remote_device *sci_dev,
                                            u16 io_tag,
                                            void *user_io_request_object,
                                            struct scic_sds_request *sci_req,
                                            struct scic_sds_request **new_sci_req)
{
        struct domain_device *dev = sci_dev_to_domain(sci_dev);
        enum sci_status status = SCI_SUCCESS;

        /* Build the common part of the request */
        scic_sds_general_request_construct(scic, sci_dev, io_tag,
                                           user_io_request_object,
                                           sci_req);

        if (dev->dev_type == SAS_END_DEV) {
                scic_sds_ssp_task_request_assign_buffers(sci_req);

                sci_req->has_started_substate_machine = true;

                /* Construct the started sub-state machine. */
                sci_base_state_machine_construct(
                        &sci_req->started_substate_machine,
                        sci_req,
                        scic_sds_io_request_started_task_mgmt_substate_table,
                        SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATE_AWAIT_TC_COMPLETION
                        );
        } else if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP))
                scic_sds_stp_request_assign_buffers(sci_req);
        else
                status = SCI_FAILURE_UNSUPPORTED_PROTOCOL;

        if (status == SCI_SUCCESS) {
                sci_req->is_task_management_request = true;
                memset(sci_req->task_context_buffer, 0, sizeof(struct scu_task_context));
                *new_sci_req = sci_req;
        }

        return status;
}