drivers/scsi/isci/remote_node_table.h - linux - Git at Google

 /*
  * This file is provided under a dual BSD/GPLv2 license.  When using or
  * redistributing this file, you may do so under either license.
  *
  * GPL LICENSE SUMMARY
  *
  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
  * published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  * The full GNU General Public License is included in this distribution
  * in the file called LICENSE.GPL.
  *
  * BSD LICENSE
  *
  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  *   * Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  *   * Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in
  *     the documentation and/or other materials provided with the
  *     distribution.
  *   * Neither the name of Intel Corporation nor the names of its
  *     contributors may be used to endorse or promote products derived
  *     from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #ifndef _SCIC_SDS_REMOTE_NODE_TABLE_H_
 #define _SCIC_SDS_REMOTE_NODE_TABLE_H_

 #include "isci.h"

 /**
  *
  *
  * Remote node sets are sets of remote node index in the remote node table. The
  * SCU hardware requires that STP remote node entries take three consecutive
  * remote node index so the table is arranged in sets of three. The bits are
  * used as 0111 0111 to make a byte and the bits define the set of three remote
  * nodes to use as a sequence.
  */
 #define SCIC_SDS_REMOTE_NODE_SETS_PER_BYTE 2

 /**
  *
  *
  * Since the remote node table is organized as DWORDS take the remote node sets
  * in bytes and represent them in DWORDs. The lowest ordered bits are the ones
  * used in case full DWORD is not being used. i.e. 0000 0000 0000 0000 0111
  * 0111 0111 0111 // if only a single WORD is in use in the DWORD.
  */
 #define SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD \
 	(sizeof(u32) * SCIC_SDS_REMOTE_NODE_SETS_PER_BYTE)
 /**
  *
  *
  * This is a count of the numeber of remote nodes that can be represented in a
  * byte
  */
 #define SCIC_SDS_REMOTE_NODES_PER_BYTE	\
 	(SCU_STP_REMOTE_NODE_COUNT * SCIC_SDS_REMOTE_NODE_SETS_PER_BYTE)

 /**
  *
  *
  * This is a count of the number of remote nodes that can be represented in a
  * DWROD
  */
 #define SCIC_SDS_REMOTE_NODES_PER_DWORD	\
 	(sizeof(u32) * SCIC_SDS_REMOTE_NODES_PER_BYTE)

 /**
  *
  *
  * This is the number of bits in a remote node group
  */
 #define SCIC_SDS_REMOTE_NODES_BITS_PER_GROUP   4

 #define SCIC_SDS_REMOTE_NODE_TABLE_INVALID_INDEX      (0xFFFFFFFF)
 #define SCIC_SDS_REMOTE_NODE_TABLE_FULL_SLOT_VALUE    (0x07)
 #define SCIC_SDS_REMOTE_NODE_TABLE_EMPTY_SLOT_VALUE   (0x00)

 /**
  *
  *
  * Expander attached sata remote node count
  */
 #define SCU_STP_REMOTE_NODE_COUNT        3

 /**
  *
  *
  * Expander or direct attached ssp remote node count
  */
 #define SCU_SSP_REMOTE_NODE_COUNT        1

 /**
  *
  *
  * Direct attached STP remote node count
  */
 #define SCU_SATA_REMOTE_NODE_COUNT       1

 /**
  * struct sci_remote_node_table -
  *
  *
  */
 struct sci_remote_node_table {
 	/**
 	 * This field contains the array size in dwords
 	 */
 	u16 available_nodes_array_size;

 	/**
 	 * This field contains the array size of the
 	 */
 	u16 group_array_size;

 	/**
 	 * This field is the array of available remote node entries in bits.
 	 * Because of the way STP remote node data is allocated on the SCU hardware
 	 * the remote nodes must occupy three consecutive remote node context
 	 * entries.  For ease of allocation and de-allocation we have broken the
 	 * sets of three into a single nibble.  When the STP RNi is allocated all
 	 * of the bits in the nibble are cleared.  This math results in a table size
 	 * of MAX_REMOTE_NODES / CONSECUTIVE RNi ENTRIES for STP / 2 entries per byte.
 	 */
 	u32 available_remote_nodes[
 		(SCI_MAX_REMOTE_DEVICES / SCIC_SDS_REMOTE_NODES_PER_DWORD)
 		+ ((SCI_MAX_REMOTE_DEVICES % SCIC_SDS_REMOTE_NODES_PER_DWORD) != 0)];

 	/**
 	 * This field is the nibble selector for the above table.  There are three
 	 * possible selectors each for fast lookup when trying to find one, two or
 	 * three remote node entries.
 	 */
 	u32 remote_node_groups[
 		SCU_STP_REMOTE_NODE_COUNT][
 		(SCI_MAX_REMOTE_DEVICES / (32 * SCU_STP_REMOTE_NODE_COUNT))
 		+ ((SCI_MAX_REMOTE_DEVICES % (32 * SCU_STP_REMOTE_NODE_COUNT)) != 0)];

 };

 /* --------------------------------------------------------------------------- */

 void sci_remote_node_table_initialize(
 	struct sci_remote_node_table *remote_node_table,
 	u32 remote_node_entries);

 u16 sci_remote_node_table_allocate_remote_node(
 	struct sci_remote_node_table *remote_node_table,
 	u32 remote_node_count);

 void sci_remote_node_table_release_remote_node_index(
 	struct sci_remote_node_table *remote_node_table,
 	u32 remote_node_count,
 	u16 remote_node_index);

 #endif /* _SCIC_SDS_REMOTE_NODE_TABLE_H_ */
	/*
	* This file is provided under a dual BSD/GPLv2 license. When using or
	* redistributing this file, you may do so under either license.
	*
	* GPL LICENSE SUMMARY
	*
	* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of version 2 of the GNU General Public License as
	* published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
	* The full GNU General Public License is included in this distribution
	* in the file called LICENSE.GPL.
	*
	* BSD LICENSE
	*
	* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in
	* the documentation and/or other materials provided with the
	* distribution.
	* * Neither the name of Intel Corporation nor the names of its
	* contributors may be used to endorse or promote products derived
	* from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#ifndef _SCIC_SDS_REMOTE_NODE_TABLE_H_
	#define _SCIC_SDS_REMOTE_NODE_TABLE_H_

	#include "isci.h"

	/**
	*
	*
	* Remote node sets are sets of remote node index in the remote node table. The
	* SCU hardware requires that STP remote node entries take three consecutive
	* remote node index so the table is arranged in sets of three. The bits are
	* used as 0111 0111 to make a byte and the bits define the set of three remote
	* nodes to use as a sequence.
	*/
	#define SCIC_SDS_REMOTE_NODE_SETS_PER_BYTE 2

	/**
	*
	*
	* Since the remote node table is organized as DWORDS take the remote node sets
	* in bytes and represent them in DWORDs. The lowest ordered bits are the ones
	* used in case full DWORD is not being used. i.e. 0000 0000 0000 0000 0111
	* 0111 0111 0111 // if only a single WORD is in use in the DWORD.
	*/
	#define SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD \
	(sizeof(u32) * SCIC_SDS_REMOTE_NODE_SETS_PER_BYTE)
	/**
	*
	*
	* This is a count of the numeber of remote nodes that can be represented in a
	* byte
	*/
	#define SCIC_SDS_REMOTE_NODES_PER_BYTE \
	(SCU_STP_REMOTE_NODE_COUNT * SCIC_SDS_REMOTE_NODE_SETS_PER_BYTE)

	/**
	*
	*
	* This is a count of the number of remote nodes that can be represented in a
	* DWROD
	*/
	#define SCIC_SDS_REMOTE_NODES_PER_DWORD \
	(sizeof(u32) * SCIC_SDS_REMOTE_NODES_PER_BYTE)

	/**
	*
	*
	* This is the number of bits in a remote node group
	*/
	#define SCIC_SDS_REMOTE_NODES_BITS_PER_GROUP 4

	#define SCIC_SDS_REMOTE_NODE_TABLE_INVALID_INDEX (0xFFFFFFFF)
	#define SCIC_SDS_REMOTE_NODE_TABLE_FULL_SLOT_VALUE (0x07)
	#define SCIC_SDS_REMOTE_NODE_TABLE_EMPTY_SLOT_VALUE (0x00)

	/**
	*
	*
	* Expander attached sata remote node count
	*/
	#define SCU_STP_REMOTE_NODE_COUNT 3

	/**
	*
	*
	* Expander or direct attached ssp remote node count
	*/
	#define SCU_SSP_REMOTE_NODE_COUNT 1

	/**
	*
	*
	* Direct attached STP remote node count
	*/
	#define SCU_SATA_REMOTE_NODE_COUNT 1

	/**
	* struct sci_remote_node_table -
	*
	*
	*/
	struct sci_remote_node_table {
	/**
	* This field contains the array size in dwords
	*/
	u16 available_nodes_array_size;

	/**
	* This field contains the array size of the
	*/
	u16 group_array_size;

	/**
	* This field is the array of available remote node entries in bits.
	* Because of the way STP remote node data is allocated on the SCU hardware
	* the remote nodes must occupy three consecutive remote node context
	* entries. For ease of allocation and de-allocation we have broken the
	* sets of three into a single nibble. When the STP RNi is allocated all
	* of the bits in the nibble are cleared. This math results in a table size
	* of MAX_REMOTE_NODES / CONSECUTIVE RNi ENTRIES for STP / 2 entries per byte.
	*/
	u32 available_remote_nodes[
	(SCI_MAX_REMOTE_DEVICES / SCIC_SDS_REMOTE_NODES_PER_DWORD)
	+ ((SCI_MAX_REMOTE_DEVICES % SCIC_SDS_REMOTE_NODES_PER_DWORD) != 0)];

	/**
	* This field is the nibble selector for the above table. There are three
	* possible selectors each for fast lookup when trying to find one, two or
	* three remote node entries.
	*/
	u32 remote_node_groups[
	SCU_STP_REMOTE_NODE_COUNT][
	(SCI_MAX_REMOTE_DEVICES / (32 * SCU_STP_REMOTE_NODE_COUNT))
	+ ((SCI_MAX_REMOTE_DEVICES % (32 * SCU_STP_REMOTE_NODE_COUNT)) != 0)];

	};

	/* --------------------------------------------------------------------------- */

	void sci_remote_node_table_initialize(
	struct sci_remote_node_table *remote_node_table,
	u32 remote_node_entries);

	u16 sci_remote_node_table_allocate_remote_node(
	struct sci_remote_node_table *remote_node_table,
	u32 remote_node_count);

	void sci_remote_node_table_release_remote_node_index(
	struct sci_remote_node_table *remote_node_table,
	u32 remote_node_count,
	u16 remote_node_index);

	#endif /* _SCIC_SDS_REMOTE_NODE_TABLE_H_ */