Release 4.7 drivers/scsi/isci/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.
*
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* 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.
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* modification, are permitted provided that the following conditions
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*
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* from this software without specific prior written permission.
*
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*/
#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 remtoe 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_ */
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