path: root/drivers/scsi/isci/remote_node_context.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 "isci.h"
#include "remote_device.h"
#include "remote_node_context.h"
#include "scu_event_codes.h"
#include "scu_task_context.h"

#undef C
#define C(a) (#a)
const char *rnc_state_name(enum scis_sds_remote_node_context_states state)
{
	static const char * const strings[] = RNC_STATES;

	return strings[state];
}
#undef C

/**
 *
 * @sci_rnc: The state of the remote node context object to check.
 *
 * This method will return true if the remote node context is in a READY state
 * otherwise it will return false bool true if the remote node context is in
 * the ready state. false if the remote node context is not in the ready state.
 */
bool sci_remote_node_context_is_ready(
	struct sci_remote_node_context *sci_rnc)
{
	u32 current_state = sci_rnc->sm.current_state_id;

	if (current_state == SCI_RNC_READY) {
		return true;
	}

	return false;
}

static union scu_remote_node_context *sci_rnc_by_id(struct isci_host *ihost, u16 id)
{
	if (id < ihost->remote_node_entries &&
	    ihost->device_table[id])
		return &ihost->remote_node_context_table[id];

	return NULL;
}

static void sci_remote_node_context_construct_buffer(struct sci_remote_node_context *sci_rnc)
{
	struct isci_remote_device *idev = rnc_to_dev(sci_rnc);
	struct domain_device *dev = idev->domain_dev;
	int rni = sci_rnc->remote_node_index;
	union scu_remote_node_context *rnc;
	struct isci_host *ihost;
	__le64 sas_addr;

	ihost = idev->owning_port->owning_controller;
	rnc = sci_rnc_by_id(ihost, rni);

	memset(rnc, 0, sizeof(union scu_remote_node_context)
		* sci_remote_device_node_count(idev));

	rnc->ssp.remote_node_index = rni;
	rnc->ssp.remote_node_port_width = idev->device_port_width;
	rnc->ssp.logical_port_index = idev->owning_port->physical_port_index;

	/* sas address is __be64, context ram format is __le64 */
	sas_addr = cpu_to_le64(SAS_ADDR(dev->sas_addr));
	rnc->ssp.remote_sas_address_hi = upper_32_bits(sas_addr);
	rnc->ssp.remote_sas_address_lo = lower_32_bits(sas_addr);

	rnc->ssp.nexus_loss_timer_enable = true;
	rnc->ssp.check_bit               = false;
	rnc->ssp.is_valid                = false;
	rnc->ssp.is_remote_node_context  = true;
	rnc->ssp.function_number         = 0;

	rnc->ssp.arbitration_wait_time = 0;

	if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP)) {
		rnc->ssp.connection_occupancy_timeout =
			ihost->user_parameters.stp_max_occupancy_timeout;
		rnc->ssp.connection_inactivity_timeout =
			ihost->user_parameters.stp_inactivity_timeout;
	} else {
		rnc->ssp.connection_occupancy_timeout  =
			ihost->user_parameters.ssp_max_occupancy_timeout;
		rnc->ssp.connection_inactivity_timeout =
			ihost->user_parameters.ssp_inactivity_timeout;
	}

	rnc->ssp.initial_arbitration_wait_time = 0;

	/* Open Address Frame Parameters */
	rnc->ssp.oaf_connection_rate = idev->connection_rate;
	rnc->ssp.oaf_features = 0;
	rnc->ssp.oaf_source_zone_group = 0;
	rnc->ssp.oaf_more_compatibility_features = 0;
}

/**
 *
 * @sci_rnc:
 * @callback:
 * @callback_parameter:
 *
 * This method will setup the remote node context object so it will transition
 * to its ready state.  If the remote node context is already setup to
 * transition to its final state then this function does nothing. none
 */
static void sci_remote_node_context_setup_to_resume(
	struct sci_remote_node_context *sci_rnc,
	scics_sds_remote_node_context_callback callback,
	void *callback_parameter)
{
	if (sci_rnc->destination_state != SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_FINAL) {
		sci_rnc->destination_state = SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_READY;
		sci_rnc->user_callback     = callback;
		sci_rnc->user_cookie       = callback_parameter;
	}
}

static void sci_remote_node_context_setup_to_destory(
	struct sci_remote_node_context *sci_rnc,
	scics_sds_remote_node_context_callback callback,
	void *callback_parameter)
{
	sci_rnc->destination_state = SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_FINAL;
	sci_rnc->user_callback     = callback;
	sci_rnc->user_cookie       = callback_parameter;
}

/**
 *
 *
 * This method just calls the user callback function and then resets the
 * callback.
 */
static void sci_remote_node_context_notify_user(
	struct sci_remote_node_context *rnc)
{
	if (rnc->user_callback != NULL) {
		(*rnc->user_callback)(rnc->user_cookie);

		rnc->user_callback = NULL;
		rnc->user_cookie = NULL;
	}
}

static void sci_remote_node_context_continue_state_transitions(struct sci_remote_node_context *rnc)
{
	if (rnc->destination_state == SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_READY)
		sci_remote_node_context_resume(rnc, rnc->user_callback,
						    rnc->user_cookie);
}

static void sci_remote_node_context_validate_context_buffer(struct sci_remote_node_context *sci_rnc)
{
	union scu_remote_node_context *rnc_buffer;
	struct isci_remote_device *idev = rnc_to_dev(sci_rnc);
	struct domain_device *dev = idev->domain_dev;
	struct isci_host *ihost = idev->owning_port->owning_controller;

	rnc_buffer = sci_rnc_by_id(ihost, sci_rnc->remote_node_index);

	rnc_buffer->ssp.is_valid = true;

	if (!idev->is_direct_attached &&
	    (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP))) {
		sci_remote_device_post_request(idev, SCU_CONTEXT_COMMAND_POST_RNC_96);
	} else {
		sci_remote_device_post_request(idev, SCU_CONTEXT_COMMAND_POST_RNC_32);

		if (idev->is_direct_attached)
			sci_port_setup_transports(idev->owning_port,
						  sci_rnc->remote_node_index);
	}
}

static void sci_remote_node_context_invalidate_context_buffer(struct sci_remote_node_context *sci_rnc)
{
	union scu_remote_node_context *rnc_buffer;
	struct isci_remote_device *idev = rnc_to_dev(sci_rnc);
	struct isci_host *ihost = idev->owning_port->owning_controller;

	rnc_buffer = sci_rnc_by_id(ihost, sci_rnc->remote_node_index);

	rnc_buffer->ssp.is_valid = false;

	sci_remote_device_post_request(rnc_to_dev(sci_rnc),
				       SCU_CONTEXT_COMMAND_POST_RNC_INVALIDATE);
}

static void