drivers/scsi/isci/ssp_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 "host.h"
#include "request.h"
#include "state_machine.h"
#include "scu_task_context.h"
#include "scu_completion_codes.h"

/**
 * This method processes the completions transport layer (TL) status to
 *    determine if the RAW task management frame was sent successfully. If the
 *    raw frame was sent successfully, then the state for the task request
 *    transitions to waiting for a response frame.
 * @sci_req: This parameter specifies the request for which the TC
 *    completion was received.
 * @completion_code: This parameter indicates the completion status information
 *    for the TC.
 *
 * Indicate if the tc completion handler was successful. SCI_SUCCESS currently
 * this method always returns success.
 */
static enum sci_status scic_sds_ssp_task_request_await_tc_completion_tc_completion_handler(
	struct scic_sds_request *sci_req,
	u32 completion_code)
{
	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
			);

		sci_base_state_machine_change_state(
			&sci_req->started_substate_machine,
			SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATE_AWAIT_TC_RESPONSE
			);
		break;

	case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_ACK_NAK_TO):
		/*
		 * Currently, the decision is to simply allow the task request to
		 * timeout if the task IU wasn't received successfully.
		 * There is a potential for receiving multiple task responses if we
		 * decide to send the task IU again. */
		dev_warn(scic_to_dev(sci_req->owning_controller),
			 "%s: TaskRequest:0x%p CompletionCode:%x - "
			 "ACK/NAK timeout\n",
			 __func__,
			 sci_req,
			 completion_code);

		sci_base_state_machine_change_state(
			&sci_req->started_substate_machine,
			SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATE_AWAIT_TC_RESPONSE
			);
		break;

	default:
		/*
		 * All other completion status cause the IO to be complete.  If a NAK
		 * was received, then it is up to the user to retry the request. */
		scic_sds_request_set_status(
			sci_req,
			SCU_NORMALIZE_COMPLETION_STATUS(completion_code),
			SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR
			);

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

	return SCI_SUCCESS;
}

/**
 * This method is responsible for processing a terminate/abort request for this
 *    TC while the request is waiting for the task management response
 *    unsolicited frame.
 * @sci_req: This parameter specifies the request for which the
 *    termination was requested.
 *
 * This method returns an indication as to whether the abort request was
 * successfully handled. need to update to ensure the received UF doesn't cause
 * damage to subsequent requests (i.e. put the extended tag in a holding
 * pattern for this particular device).
 */
static enum sci_status scic_sds_ssp_task_request_await_tc_response_abort_handler(
	struct scic_sds_request *request)
{
	sci_base_state_machine_change_state(&request->state_machine,
			SCI_BASE_REQUEST_STATE_ABORTING);
	sci_base_state_machine_change_state(&request->state_machine,
			SCI_BASE_REQUEST_STATE_COMPLETED);
	return SCI_SUCCESS;
}

/**
 * This method processes an unsolicited frame while the task mgmt request is
 *    waiting for a response frame.  It will copy the response data, release
 *    the unsolicited frame, and transition the request to the
 *    SCI_BASE_REQUEST_STATE_COMPLETED state.
 * @sci_req: This parameter specifies the request for which the
 *    unsolicited frame was received.
 * @frame_index: This parameter indicates the unsolicited frame index that
 *    should contain the response.
 *
 * This method returns an indication of whether the TC response frame was
 * handled successfully or not. SCI_SUCCESS Currently this value is always
 * returned and indicates successful processing of the TC response. Should
 * probably update to check frame type and make sure it is a response frame.
 */
static enum sci_status scic_sds_ssp_task_request_await_tc_response_frame_handler(
	struct scic_sds_request *request,
	u32 frame_index)
{
	scic_sds_io_request_copy_response(request);

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

static const struct scic_sds_io_request_state_handler scic_sds_ssp_task_request_started_substate_handler_table[] = {
	[SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATE_AWAIT_TC_COMPLETION] = {
		.abort_handler		= scic_sds_request_started_state_abort_handler,
		.tc_completion_handler	= scic_sds_ssp_task_request_await_tc_completion_tc_completion_handler,
	},
	[SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATE_AWAIT_TC_RESPONSE] = {
		.abort_handler		= scic_sds_ssp_task_request_await_tc_response_abort_handler,
		.frame_handler		= scic_sds_ssp_task_request_await_tc_response_frame_handler,
	}
};

/**
 * This method performs the actions required when entering the
 *    SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATE_AWAIT_TC_COMPLETION
 *    sub-state.  This includes setting the IO request state handlers for this
 *    sub-state.
 * @object: This parameter specifies the request object for which the sub-state
 *    change is occurring.
 *
 * none.
 */
static void scic_sds_io_request_started_task_mgmt_await_tc_completion_substate_enter(
	void *object)
{
	struct scic_sds_request *sci_req = object;

	SET_STATE_HANDLER(
		sci_req,
		scic_sds_ssp_task_request_started_substate_handler_table,
		SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATE_AWAIT_TC_COMPLETION
		);
}

/**
 * This method performs the actions required when entering the
 *    SCIC_SDS_IO_REQUEST_STARTED_SUBSTATE_AWAIT_TC_RESPONSE sub-state. This
 *    includes setting the IO request state handlers for this sub-state.
 * @object: This parameter specifies the request object for which the sub-state
 *    change is occurring.
 *
 * none.
 */
static void scic_sds_io_request_started_task_mgmt_await_task_response_substate_enter(
	void *object)
{
	struct scic_sds_request *sci_req = object;

	SET_STATE_HANDLER(
		sci_req,
		scic_sds_ssp_task_request_started_substate_handler_table,
		SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATE_AWAIT_TC_RESPONSE
		);
}

const struct sci_base_state scic_sds_io_request_started_task_mgmt_substate_table[] = {
	[SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATE_AWAIT_TC_COMPLETION] = {
		.enter_state = scic_sds_io_request_started_task_mgmt_await_tc_completion_substate_enter,
	},
	[SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATE_AWAIT_TC_RESPONSE] = {
		.enter_state = scic_sds_io_request_started_task_mgmt_await_task_response_substate_enter,
	},
};