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/*-
* 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.
*
* 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 <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/dev/isci/scil/scif_sas_stp_remote_device.c 231689 2012-02-14 15:58:49Z jimharris $");
/**
* @file
*
* @brief This file contains the protected interface structures, constants,
* and methods for the SCIF_SAS_STP_REMOTE_DEVICE object.
*/
#include <dev/isci/scil/scif_sas_stp_remote_device.h>
#include <dev/isci/scil/scif_sas_remote_device.h>
#include <dev/isci/scil/scif_sas_domain.h>
#include <dev/isci/scil/scif_sas_controller.h>
#include <dev/isci/scil/scif_sas_logger.h>
#include <dev/isci/scil/intel_sat.h>
/**
* @brief This method performs SATA/STP specific construction of the
* STP remote device object.
*
* @param[in] device This parameter specifies the STP remote device
* object to be constructed.
*
* @return none
*/
void scif_sas_stp_remote_device_construct(
SCIF_SAS_REMOTE_DEVICE_T * device
)
{
sati_device_construct(
&device->protocol_device.stp_device.sati_device,
device->domain->controller->user_parameters.sas.is_sata_ncq_enabled,
(U8) device->domain->controller->user_parameters.sas.max_ncq_depth,
device->domain->controller->user_parameters.sas.ignore_fua
);
device->protocol_device.stp_device.s_active = 0;
}
/**
* @brief This method attempts to allocate a valid NCQ tag from the list
* of available tags in the remote device.
*
* @todo Attempt to find a CLZ like instruction to optimize this routine
* down into a few instructions. I know there is one like it for IA.
*
* @param[in] fw_device This parameter specifies the remote device
* for which to allocate an available NCQ tag.
*
* @return Return an available NCQ tag.
* @retval 0-31 These values indicate an available tag was successfully
* allocated.
* @return SCIF_SAS_STP_INVALID_NCQ_TAG This value indicates that there are
* no available NCQ tags.
*/
U8 scif_sas_stp_remote_device_allocate_ncq_tag(
SCIF_SAS_REMOTE_DEVICE_T * fw_device
)
{
U8 ncq_tag = 0;
U32 tag_mask = 1;
SCIF_LOG_TRACE((
sci_base_object_get_logger(fw_device),
SCIF_LOG_OBJECT_REMOTE_DEVICE | SCIF_LOG_OBJECT_IO_REQUEST,
"scif_sas_stp_remote_device_allocate_ncq_tag(0x%x)\n",
fw_device
));
// Try to find an unused NCQ tag.
while ( (fw_device->protocol_device.stp_device.s_active & tag_mask)
&& (ncq_tag < fw_device->protocol_device.stp_device.sati_device.ncq_depth) )
{
tag_mask <<= 1;
ncq_tag++;
}
// Check to see if we were able to find an available NCQ tag.
if (ncq_tag < fw_device->protocol_device.stp_device.sati_device.ncq_depth)
{
SCIF_LOG_INFO((
sci_base_object_get_logger(fw_device),
SCIF_LOG_OBJECT_REMOTE_DEVICE | SCIF_LOG_OBJECT_IO_REQUEST,
"RemoteDevice:0x%x NcqTag:0x%x successful NCQ TAG allocation\n",
fw_device, ncq_tag
));
fw_device->protocol_device.stp_device.s_active |= tag_mask;
return ncq_tag;
}
SCIF_LOG_INFO((
sci_base_object_get_logger(fw_device),
SCIF_LOG_OBJECT_REMOTE_DEVICE | SCIF_LOG_OBJECT_IO_REQUEST,
"RemoteDevice:0x%x unable to allocate NCQ TAG\n",
fw_device
));
// All NCQ tags are in use.
return SCIF_SAS_INVALID_NCQ_TAG;
}
/**
* @brief This method removes the specified tag from the list of
* outstanding tags. It doesn't return any values.
*
* @param[in] fw_device This parameter specifies the remote device for
* which to free an NCQ tag.
* @param[in] ncq_tag This parameter specifies the NCQ tag that is
* to be freed.
*
* @return none
*/
void scif_sas_stp_remote_device_free_ncq_tag(
struct SCIF_SAS_REMOTE_DEVICE * fw_device,
U8 ncq_tag
)
{
SCIF_LOG_INFO((
sci_base_object_get_logger(fw_device),
SCIF_LOG_OBJECT_REMOTE_DEVICE | SCIF_LOG_OBJECT_IO_REQUEST,
"RemoteDevice:0x%x NcqTag:0x%x freeing NCQ TAG\n",
fw_device, ncq_tag
));
fw_device->protocol_device.stp_device.s_active &= ~(1 << ncq_tag);
}
struct SCIF_SAS_REQUEST *
scif_sas_stp_remote_device_get_request_by_ncq_tag(
struct SCIF_SAS_REMOTE_DEVICE * fw_device,
U8 ncq_tag
)
{
SCIF_SAS_DOMAIN_T * fw_domain = fw_device->domain;
SCI_FAST_LIST_ELEMENT_T * pending_request_element;
SCIF_SAS_REQUEST_T * pending_request = NULL;
SCIF_SAS_REQUEST_T * matching_request = NULL;
pending_request_element = fw_domain->request_list.list_head;
while (pending_request_element != NULL)
{
pending_request =
(SCIF_SAS_REQUEST_T*) sci_fast_list_get_object(pending_request_element);
// The current element may be deleted from the list becasue of
// IO completion so advance to the next element early
pending_request_element = sci_fast_list_get_next(pending_request_element);
if (
(pending_request->device == fw_device) &&
(pending_request->stp.sequence.protocol == SAT_PROTOCOL_FPDMA) &&
(pending_request->stp.ncq_tag == ncq_tag)
)
{
matching_request = pending_request;
}
}
return matching_request;
}